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Publication numberUS3073932 A
Publication typeGrant
Publication dateJan 15, 1963
Filing dateSep 25, 1959
Priority dateSep 24, 1958
Also published asDE1100763B
Publication numberUS 3073932 A, US 3073932A, US-A-3073932, US3073932 A, US3073932A
InventorsRichard Schulz
Original AssigneeVoigt & Haeffner Ag
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Pneumatic controls for high-voltage air blast circuit breakers
US 3073932 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Jan. 15, 1963 3,073,932

R. SCHUL PNEUMATIC CONTROLS FOR HIGH-VOLTAGE AIR BLAST CIRCUIT BREAKERS Filed Sept. 25, 1959 3 Sheets-Sheet 1 f I i Jan 15, 1963 R. SCHULZ 3,073,932

RNEUMATIO CONTROLS FOR HIGH-VOLTAGE AIR BLAST CIRCUIT BREAKERS 5 Sheets-Sheet 2 Filed Sept. 25, 1959 y MMT-@AMW Jan. 15, 1963 R. SCHULZ 3,073,932

PNEUMATTO CONTROLS FOR HIGH-VOLTAGE ATR BLAST CIRCUIT BREAKERS Filed Sept. 25, 1959 3 Shees-ShaelI 3 3 @735 932 annemarie contre-lors non mon-vorraus. All?. BLAST QERCUHT BREAKERS Richard Schulz, Friedberg, Hesse, Germany, assigner to Voigt 8: Haerner a., Frankfurt am Main, Germany snes sept. ze, 1959,. er. No. astma Ciaims priority, application Germany Sept. 24, 19% 1l Claims. (Qi. 2Go- 143) rlhis invention has reference to high-voltage circuit breakers, and more particularly to pneumatically operated high-voltage air bla-st circuit breakers.

It is a general object of this invention to improve the control of such circuit breakers.

Circuit breakers of the aforementioned character may be designed for circuit voltages of say 220 kv., and generally comprise a hollow insulating column which supports adjacent to its upper end pairs of cooperating separable contacts, fluid motor means for operating these contacts and means for producing arc-extinguishing blasts of gas across the gaps formed between the contacts upon separation thereof.

In circuit breakers of the aforementioned character it is desirable to provide a supply of air under pressure adjacent the top end of the hollow insulating column from which air under pressure may be derived to control the operation of the movable parts of the circuit breaker, to operate its contact-operating fluid motors and blast valves and to establish the arc-extinguishing air blasts. This location of the supply of air under pressure for control purposes makes it possible to minimize circuit breaker times because it minimizes the distance between the valves which admit air under pressure to the pneumatic control system of the circuit breaker and which vent said control system to atmosphere. Since the top of the hollow insulating column is at an elevated potential, such a supply of air under pressure is also at an elevated potential, and so are the valve means for admitting air under pressure from the supply to the pneumatic control system of the circuit breaker and for venting the latter. In the interest of speed of operation such valves must be operated by positive means having a minimum of inertia or weight.

it is a special object of this invention to provide improved control means for high voltage circuit breakers of the aforementioned character, and more particularly improved valve means at an elevated potential situated adjacent the top of the hollow insulating column for admitting air under pressure to the control system of the circuit breaker and for venting its control system to atmosphere.

It is another object of this invention to provide valve means at the aforementioned location for the aforementioned purpose which valve means dene a substantially straight path for the flow of air under pressure which is controlled by the valve means.

It is still another object or this invention to provide valve means at the aforementioned location for the aforementioned purpose which valve means require but small forces for their operation and, therefore, lend themselves to be operated by linkages whose mechanical strength and weight is relatively small, and which can, therefore, readily be moved at relatively high initial speeds.

Mechanical means which are mainly subjected to tensile stresses rather than compression lend themselves to combinihg the requirements of relatively high mechanical strength and relatively small weight. Itis, therefore, another object of the invention to provide valve means at the aforementioned location and for the aforementioned purpose adapted to be operated by mechanical means which are mainly subjected to tensile stresses.

Another object of the invention is to provide valve Patented dan. l5, i953 means at the aforementioned location for the aforementioned purpose which are coupled in such a way with an operating or push and pull rod as to preclude changes in ambient temperature resulting in changes in the length'of the rod to affect the valve means and the operation thereof.

For a better understanding of the invention reference may be had to the accompanying drawings in which:

FIG. l is a section along 2 2 of FlG. 2 and shows diagrammatically some of the parts of a high-voltage circuit breaker which are at an elevated potential and supported by, and arranged adjacent the top end of a hollow insulating col-umn;

FIG. 2 is a top plan View of the structure shown in FIG. l;

FIG. 3 'shows the whole insulating column and some of the parts associated with it partly in side elevation and partly in vertical section; and

FlG. 4 is a vertical section on a larger scale than FG. 3 ot" the top end of the insulating column and the parts contained therein or associated with it.

The structure shown in FIGS. l and 2 is substantially prior art, and the invention proper has been illustrated in FIGS. 3 and 4.

Referring now to FIGS. l and 2, the two circuit `breaker heads 6, 7 are supported by a hollow insulating column 1 fully shown in FIG. 3. Both circuit breaker heads or casings 6, '7 are made of metal, and are at an elevated potential. Studs 2c in bushings 2a are used for serially connecting the separable cooperating contacts in casings 6, 7 to contacts situated in adjacent casings of the same kind, as more fully shown in my copending patent application Ser. No. 610,868, tiled September 19, 1956 for Fluid Pressure Operated Circuit Breaker Pole Units, now U.S. Patent 2,964,605 issued December 13, 1960. Reference numeral 4 has been applied to generally indicate a control mechanism arranged adjacent the upper end of column l. The control mechanism 4 has been shown on larger scales in FIGS. 3 and 4. The inside of column 1 accommodates a rod 8 of insulating material adapted to operate the control mechanism 4 from the lower end of column l which is at ground potential. Air under pressure is admitted from a tank 2 situated at the bottom end of col-umn i (see FG. 3) into column 1 and is further admitted from the upper end of column l into circuit breaker heads or arcing chambers d, 7 wherein xed plug contacts 16 and cooperating nozzle contacts t7 are accommodated. The right end or" .nozzle contact .1.7, as seen in FlG. l, forms a piston l and is acted upon by a closing spring 19. Blast valve 2@ adapted to open venting port 23 is operated by a fluid motor, or pneumatic motor, which includes piston 21. The latter is biased by spring 22 and may be operated by air under pressure admitted through control pipe line 24 forming part of a pneumatic control system.

In the position of the parts shown in FG. l the arcing chambers 6, 7 housing contacts 16, 17 are lled with air under pressure admitted to them from the upper end of hollow supporting insulator 1. There is no air under pressure in pipe line 24, and hence blast valve Zi) is in the closed position shown. When air under pressure is admitted to pipe line 24, piston 21 moves from right to left against the bias of spring 22 and in so moving opens blast valve 2). As a result, the pressure inside of the arcing chambers d, '7 accommodating contacts 16 and t7 moves contacts 17 and pistons 18 from their closed position shown in FIG. 1 to the open position thereof. This movement is effected against the bias of spring i9. The arcs formed between contacts 16 and 17 are quickly extinguished by the blast of air venting through port 23. While the arc-extinguishing blast still lasts, a disconnect (not shown) may be opened, providing a permanent break in the interrupted circuit. Blast valves 20 close 3 when the pressure in pipe lines 24 is allowed to recede, as by venting thereof. As a result, springs 19 cause re-engagement of contacts 16 and 17.

This invention is concerned with valve means for venting the pneumatic' system formed by pipe lines 24 and for admitting air under pressure into that pneumatic system.

. Referring now t'o FIGS. 3 and 4, the upper end of column 1 supports a casing 3 of metal which forms a supply of air under pressure. Supporting column 1 is lmounted on a tank 2 containing air under pressure, and air under pressure contained in tank 2 may iiow through column 1 into casing 3 on the top of column l. Tank 2 is at ground potential,v whereas metal casing 3 is at an elevated potential. Both circuit breaker heads 6 and 7` and the pneumatic control system 24 may be supplied with air under pressure derived from casing 3. The valve means I4 adjacent the upper end of column 1, i.e. inside of casing 3, control the flow of air under pressure from casing 3 into control system 24. Valve means 4 are also adapted to vent control system 24 to atmosphere. Valve means 4 include means defining a substantially straight passageway 9 having an upstreamend 9 and a downstream end 9". Valve element 10 is arranged adjacent the upstream end `9 of passageway 9 and adapted to cooperate with a valve seat coextensive with the upstream end 9 of passageway 9. Valve element 10 has two limit positions, namely a closed position wherein it engages the valve seat, and an open position wherein it is moved downwardly, or in upstream direction, into casing 3. Valve means 4 further include a second valve element 12 arranged adjacent the downstream end 9" of passageway 9 and adapted to control the venting orifices 13 provided in a casting mounted on casing 3 and defining passageway 9 as well as venting orifices 13'. Another casting mounted on the aforementioned casting defines an orifice S for admitting air under pressure from casing or housing 3 to conduits 24. The valve element 12 has a seal-off position wherein it closes the venting orifices 13, and a venting position wherein it opens the orifices 13. Valve elements 10 and 12 are mounted on a common stem 14. When valve element r10 is in the open position thereof valve element 12 is in the seal-olf position thereof. When valve element 10 is in its closed position valve element 12 is in the venting position thereof. Valve element 12 has an upstream surface cooperating with the orifices 13 tov close the same and a downstream surface. A duct 11 extends transversely to said upstream surface and said downstream surface. This duct allows air under pressure to iiow from the supply of air under pressure formed by easing 3 to control system 24 when valve element 12 is in the seal-off position thereof. In FIG. 4 the flow of air under pressure through duct 11 has been indicated by a pair of arrows extending in the direction of the flow of air through duct 11 formed by valve element 12. Stem 14 is guided in a fixed frame structure 16. One end of helical stem-biasing spring 15' rests against the valve element 10, while the opposite end of spring l15' rests against the aforementioned fixed frame structure 16. It

will be thus apparent that spring 15 biases valve element 60 10 to the closed position thereof, and biases valve element 12 to the venting position thereof. Both valve elements 10 and 12 are arranged in coaxial relation. The insulating rod S inside column 1 is in coaxial relation to column 1, to valve elements 10 and 12 and to stem 65 vertical arm supporting roller means 26. Reference numeral 19 has been applied to indicate the point of cooperative engagement of levers 1'7, 18 and stem 14. The upper end of rod 8 supports a cam 23 engaged by roller means 2o and controlling the movement of levers 17', 1S. Cam 23 comprises a first pair of oblique surfaces 22' converging in upward direction, a second pair of oblique surfaces 22 converging in downward direction, and a third pair of vertical surfaces parallel to the aforementioned plane extending vertically through rod 8. The third pair of surfaces of cam 23' is arranged intermediate the first pair of surfaces 22 and the second pair of surfaces 22". No reference numeral has been applied to the third pair of surfaces of cam 23. As shown in FIG. 4, `the third pair of surfaces of cam 23 is engaged by roller means 26. A pair of bolts or studs 24' and 25' is secured to the upper end of rod 8, i.e. to cam'23'. Bolts or studs 24, 25' are adapted to slidably engage coaxial bores 24, 25 defined by fixed frame structure 16.

When roller means 26 engage the'lower converging sur `faces 22 of cam 23 and rod 8 is pulled indownward direction, the spacing between roller lmeans 26 is progressively increased,` resulting in a pivotal movement of levers 17 and 18 and concomitant lowering of point 19" where levers 17' and 18 are operatively secured to stem'` 14. C0nsequently stem 14'is lowered, and spring 15I compressed, when rod 8 is pulled in downward direction..

In other words, the force needed for compressing spring:

15 stresses rod 8 which has in inherently high tensile strength. Valve element 10 is in its fully open position and valve element 12 is in its full seal-olf position when rollers 26 move from. the lower slanting surfaces 22 of cam 23 to its parallel vertical surfaces. On upward movement of rod 8 rollers 26 are caused t-o engage again the two surfaces 22 on cam 23' which converge in downward direction. As a result, spring 15 is allowed to expand, moving valve element 10 toward its higher or closed position, and moving valve element 12 toward its higher or venting position. When rod 8 is pushed'upwardly it is placed under compression, but the forces of compression are minimal since the entire valve means 4 is then operated by the energy stored in spring 15, and rod S is merely subjected to the small frictional forces of the cam' and lever mechanism 23', 17", 18'. The upper end of rod 8 is guided along a straight path by means of the cooperatin-gA guiding means 24', 24 and 25", 2S". When stern 14 is in its lower position shown in FIG. 4, the pressure of air against the downstream surface of valve element 12 tends to maintain both valve elements 12 and 10 in the lower position thereof. When stem 14 has been moved -to the upper position thereof, the pressure of air against the upstream surface of valve element 1u tends to maintain both valve elements 10 and 12 in the higher position thereof. Thus no forces have to be transmitted through rod 8' upon having moved valve assembly 4 to one of the two limit positions thereof. Since rod 3 is mainly subjected to tensile stress, and has an inherently high tensile strength, its weight may be light and its speed of operation high.

The path of compressed air from the supply 3 through passage 9 and the orifice 5 by which the upper end of valve assembly 4 is connected to the control system 24- is substantially a straight line. This tends to establish a rapid fiow of air toward and in control system 24, and' consequently a rapid operation 0f the blast valve and a rapid separation of the cooperating contacts of the circuit breaker.

It will also be apparent that slight changes in the length of rod 8 as caused by changes intemperature have no effect whatever on t-heV operation ofl valve mechanism 4.

lt will be understood that although but one embodiment of the invention has been illustrated and described in detail, the invention is not limited thereto. It will also be understood that the .structure illustrated may be modied without departing from the spirit and scope of the invention as set forth in the accompanying claims.

l claim as my invention:

l. in a high-voltage circuit breaker the combination of a vertical hollow insulating column; relatively movable contact means arranged adjacent the upper end of said column; a blast valve arranged adjacent the upper end of said column for producing an arc-extinguishing blast across the gap formed between said Contact means upon separation thereof; means for filling said column with air under pressure; a pneumatic system for said contact means and blast valve arranged adjacent the upper end of said column and including tluid motor means for operating said contact means and said blast valve; said pneumatic system further comprising valve means for selectively admitting air under pressure to said fluid motor means and for venting said fluid motor means to atmosphere; said valve means including a valve housing aligned with said column, supported by the upper end thereof and permanently communicating with said upper end, said valve housing defining a substantially straight passageway in coaxial relation to said column; a first valve element arranged Iadjacent the upstream end of said passageway and having a first limit position causing opening of said passageway and a second limit position causing closing of said passageway; a second valve element arranged in coaxial relation to said rst valve element adjacent the downstream end of said passageway and having a iirst limit position causing said passageway to be sealed od from atmosphere and a second limit position causing said passageway to be vented to atmosphere; a common stem supporting said first valve element and said second valve element to move said first valve element and said second valve element jointly to said first limit positions and said second limit positions thereof; spring means biasing said first valve element and said second valve element to said second limit positions thereof; said second valve element defining a duct extending in a direction substantially longitudinally of said stem causing the pressure or" air passing said first valve element and said duct to maintain said second valve element and said first valve element in said second limit positions thereof; and an insulating rod arranged inside said column adapted to be moved in directions longitudinally thereof and operatively related to said stern to operate said valve means from the bottom end of said column.

2. ln a high-voltage circuit breaker the combination of a vertical hollow insulating column; relatively movable contact means arranged adiacent the upper end of said column; a blast valve arranged adjacent the upper end of said column for producing an arc-extinguishing blast across the gap formed between said Contact means upon separation thereof; a taule at the lower end of said column for filling said column with gas under pressure; a pneumatic system for said `Contact means and blast valve arranged adjacent the upper end of said column and including fluid motor means for operating said contact means and said blast valve; said pneumatic system further comprising valve means for selectively admitting gas under pressure to said fluid motor means and for venting said fluid motor means; said valve means includa valve housing aligned with said column, supported by the upper end thereof and permanently communicating with said upper end, said valve housing defining a substantially straight passageway for gas under pressure; a valve seat formed by the intake end of said passagewaydelining means; a first valve element movable in a direction longitudinally of said passageway between limit positions situated at points upstream of said intake end to selectively engage said valve seat and be disengaged from said valve seat; orifice means for venting said passageway and said fluid motor means; a second valve element arranged in coaxial relation to said first valve element at a point of said passageway situated downstream of said first valve element; said second valve element comprising a downstream surface and an upstream surface adapted to selectively close said orifice means and open said orifice means; a common stem supporting said first valve element and said second valve element; a helical spring surrounding said stern and biasing said first valve element into engagement with said valve seat and biasing said second valve element to the orifice means opening position thereof; said second valve element defininfr a duct extending in a direction substantially longitudinally of said stern to cause gas under pressure passing through said duct to press against said downstream surface of said second valve element to maintain said second valve element in said orifice closing position thereof and to maintain said rfirst valve element out of engagement with said valve seat thereof; and an insulating rod arranged inside said column adapted to be moved in directions longitudinally thereof and operatively related to said stem to operate said valve means from the bottom end of said column.

3. ln a high-voltage circuit breaker the combination of a vertical insulating column; relatively movable contact means arranged adjacent the upper end of said column; a blast valve arranged adjacent the upper end of said column for producing an arc-extinguishing blast across the gap formed between said contact means upon separation thereof; means for filling said column with gas under pressure; a pneumatic system for said contact means and blast valve arranged adjacent the upper end of said column and including fluid motor means for operating said Contact means and said blast valve; said pneumatic system further comprising valve means for selectively admitting under pressure to said `fluid motor means and for venting said fluid motor means to atmosphere; said valve means including a valve housing aligned with said column, supported by the upper end thereof and permanently communicating with said upper end, said valve housing defining a substantially straight passageway for gas under pressure; a first valve element arranged tadjacent the upstream end of said passageway and having a first limit position causing opening of said passageway and a second limit position causing closing of said passageway; a second valve element arranged in coaxial relation to said first valve element adjacent the downstream end of said passageway and having a rst limit position causing said passageway :and said liuid motor means to be sealed-off from atmosphere and a second limit positon causing venting of said passageway and of said fluid motor means to atmosphere, said second valve element having an upstream surface and a downstream surface and defining a duct extending substantially transersely across said upstream surface and said downstream surface to cause gas under pressure passing through said duct to press against said downstream surfact to maintain said second valve element in said second limit positions thereof; a common stem supporting said iirst valve element and said second valve element to cause said first valve element to assume said first limit position thereof when said second valve element is in said first limit position thereof; spring means biasing said stem to move said first valve element and said second valve element to said second limit positions thereof; an insulating rod arranged inside said column extending in a direction longitudinally of said column for operating said stern from the bottom end of said column; a cam arranged inside said valve housing and supported on the upper end of said rod; and a pair of pivotally mounted bell-cranlr-shaped levers also arranged inside said valve housing each having one arm in cooperative engagement with said stem land each having another arm under the control of said cam.

4. An arrangement as specified in claim 3 wherein each of said pair of levers is provided witi one of a pair of rollers in engagement with said cani, and wherein envases said cam has a pair of converging surfaces and a pair of parallel surfaces.

5. In a high-voltage circuit breaker the combination of a vertical hollow insulating column; relatively movable contact means arranged ladjacent the upper end of said column for producing an arc-extinguishing blast across the gap formed between said contact means upon separation thereof; a tank at the lower end of said column for filling said column with gas under pressure; a pneumatic system for said contact means and blast valve arranged adjacent theI upper end of said column and including duid motor means for operating said contact means and said blast valve; said pneumatic system further comprising valve means for selectively admitting gas under pressure to said fluid motor means and for venting said fluid motor means to atmosphere; said valve means comprising a valve housing aligned with said column, supported by the upper end thereof and permanently communicating `with said upper end, said valve housing deiining a substantially straight passageway for gas under pressure; a tirst valve element arranged adjacent the upstream end of said passageway and having a iirst limit position causing opening of said passageway and a second limit position causing closing of said passageway; a second valve element arranged in coaxial relation to said :lirst valve element adjacent the downstream end of said passageway and having a rst limit position causing said passageway and said fluid motor means to be sealed-off from atmosphere and a second limit position causing said iluid motor means to be vented to atmosphere, said second valve element having an upstream surfface and a downstream surface and defining a duct extending substantially transversely across said upstream surface and said downstream surface to cause gas under pressure passing through said duct to act against said downstream surface thereby maintaining said second valve element in said -rst limit position thereof; a common stern supporting said rst valve element and said second valve element to cause joint movement of said first valve element and of said second valve element to said -iirst limit positions thereof and joint movement of said tirst valve element and of said second valve to said second limit positions thereof; spring means resting against said valve housing biasing said iirst valve element and said second valve element to said second limit positions thereof; an insulating rod arranged inside said column for operating said stem arranged in coaxial relation to said stem; a substantially wedge-shaped cam arranged inside said valve housing on the upper end of said rod; a pair of bell-crank-shaped levers also arranged inside said valve housing pivotally mounted on said valve housing each having one arm in cooperative engagement with said stem and each having another arm under the immediate control of said cam, and cooperating guide means on said valve housing and on said cam for guiding the upper end of said rod in Va direction longitudinally thereof.

6. In a high-voltage circuit breaker the combination of a vertical hollow insulating column; relatively movable contact means arranged adjacent the upper end of said column for producing an arc-extengiushing blast across the gap formed between said contact means upon separation thereof; a pneumatic system for said contact means and said blast valve arranged adjacent the upper end of said column and including fluid motor means for operating said contact means and said blast valve; a supply of air under pressure lfor filling said column with iair under pressure; valve means adjacent the upper end of said column for admitting air under pressure from said column to said tluid motor means and for venting said fluid motor means to atmosphere, said valve means having a valve housing aligned with said column, supported by the upper end thereof and permanently communicating with said upper end, said Valve housing accommodating a pair of valve elements having a pair of limit positions; a compression spring biasing said valve elements to one of said pair of limit positions; an insulating rod arranged inside said column extending in a direction longitudinally of said solumn for operating said vaive elements from the lower end of said column; and a coupling connecting said valve elements to said rod adapted to cause a ldownward pull on said rod to compress said spring and move said valve ele-ments to one of said pair of limit positions and to cause an upward push on said rod to release said spring and allow said valve elements to be moved by said spring to the other of said pair of limit positions.

7. In a high-voltage circuit breaker the combination of a vertical hollow insulating column; relatively movable contact means arranged adjacent the upper end of said column; a blast valve arranged adjacent the upper end of said column for producing an arc-extinguishing blast across the gap formed between said contact means upon separation thereof; a pneumatic control system for said contact means and said blast valves arranged adjacent the upper end of said column and including fluid motor means for operating said contact means and said blast valve; a supply of air under pressure for filling said column with air under pressure; valve means adjacent the upper end of said column for admitting air under pressure from said column to said fluid motor means and for venting said uid motor means to atmosphere; said valve means including a valve housing aligned with said column, supported by the upper end thereof and permanently communicating with said upper end, said valve housing defining a passageway connecting said fluid motor means with said upper end of said column; said valve Vmeans further including a first valve element arranged `adjacent the upstream end of said passageway and having an open position and a closed position; said valve means further including a second valve element arranged adjacent the downstream end of said passageway having a seal-off position and a venting position and defining a duct allowing air under pressure to flow from said upper end o'f said column to said liuid motor means when said second valve element is in said seal-ofi position thereof; a stem connecting said first valve element and said second valve element to cause joint movement of said first valve element to said open position thereof and of said second valve element to said seal-ott position thereof; spring means biasing said iirst valve element to said closed position thereof and biasing said second valve element to said venting position thereof; and insulating rod arranged inside of said column extending in a direction longitudinally thereof for operating said stem from the lower end of said column; pivotally mounted bell-crank-shaped lever means arranged inside said valve housing having one arm in operative engagement with said stem and another `arm adapted to be operated by said rod; and cam means also arranged inside said valve housing on the upper end of said rod in operative engagement with said other arm, said cam means comprising a first surface adapted to cause said lever means to be pivoted in one direction against the bias of said spring means by downward pull of said rod; and said cam means further comprising a second surface adapted to allow said lever means to be pivoted in the opposite direction under the action of said spring means upon an upward push of said rod.

8. In a high-voltage circuit breaker the combination of a vertical hollow insulating column; relatively movable contact means arranged adjacent the upper end of said column; a blast valve arranged adjacent the upper end of said column for producing an arc-extinguishing blast across the gap formed between said contact means upon separation thereof; a pneumatic system for said contact means and blast valve arranged adjacent the upper end of said column and including iiuid motor means for operating said contact means and said blast valve; a supply of air under pressure for filling said column with air under pressure; valve means adjacent the upper end of said column for admitting air under pressure from said column to said fiuid motor means `and for venting said uid motor means to atmosphere; said valve means including a valve housing aligned with said column, supported by the upper end thereof and permanently communicating with said upper end, said valve housing defining a passageway connecting said upper end of said column to said liuid motor means; said valve means further including a first valve element arranged adjacent the upstream end of said passageway and having an open position and a closed position; said valve means further including a second valve element arranged adjacent the downstream end of said passageway having a seal-off position and a venting position and defining a duct allowing air under pressure to fiow from said upper end of said column to said fluid motor when said second valve element is in said seal-od position thereof; a stem connecting said first valve element and said second valve element to cause joint movement of said first valve element to said open position thereof `and of said second valve element to said seal-off position thereof; a helical compression spring surrounding said stem biasing said first valve element to said closed position thereof and biasing said second valve element to said venting position thereof; a vertical insulating rod arranged inside said column for operating said stem from the lower end of said column; a pair of pivotally mounted bell-crank shaped levers accommodated inside said valve housing arranged symmetrically in regard to a plaie extending vertically through said rod, each of said pair of levers having a substantially horizontal arm in operative engagement with said stem and a substantially vertical arm supporting a roller means; and cam means also arranged inside said Valve housing on the upper end of said rod in operative engagement with said substantially vertical arm of said pair of levers, said cam means comprising a first pair of oblique surfaces converging in downward direction, and a second pair of vertical surfaces parallel to said plane extending vertically through said rod.

9. In a high-voltage circuit breaker the combination of a vertical hollow insulating column; a pneumatic system adjacent the upper end of said column and including fluid motor means for operating said contact means and said blast valve; a supply of air under pressure for filling said column with air under pressure; Valve means adjacent the upper end o t said column for admitting of air under pressure from said column to said fluid motor means and for venting said fiuid motor lmeans to atmosphere; said valve means including a valve housing aligned with said column, supported by the upper end thereof and permanently communicating with said upper end, said valve housing defining a passage vay connecting said upper end of said column to said fluid motor means; said valve means further including a first valve element arranged adjacent the upstream end of said passageway and having a relatively low open position and a relatively elevated closed position; said valve means further including a second valve element arranged adjacent the downstream end of said passageway and having a relatively low seal-od position and a relatively elevated venting position, said second valve element defining a duct allowing air under pressure to iiow from said upper end of said column to said fluid motor means when said second valve element is in said seal-off position thereof; a stem connecting said first valve element and said second valve element to jointly raise and jointly lower said first valve element and said second valve element; a spring biasing said stem in an upward direction, a vertical insulating rod arranged inside said column adapted to be pulled downwardly to move said stem downwardly and compress said spring, and means including lever means and cam means allowing said spring to expand upon upward movement of said rod.

10. 'In a high-voltage circuit breaker the combination a vertical hollow insulating column normally filled with air under pressure;

`a pair of tanks supplied with air under pressure from said column arranged to both sides of the top end of said column, each of said pair of tanks housing relatively movable contact means, a blast valve and fiuid motor means for operating said contact means and said blast valve and responsive to the admission of air under pressure and to dumping of air under pressure;

valve means comprising a metallic casing structure arranged in coaxial relation to said column between said pair of tanks `and supported by said top end of said column and communicating with said column, `said casing structure defining a passageway extending substantially in a direction longitudinally of said column and having an orifice connected by pipe lines to said fluid motor means for selectively admitting air under pressure to and dumping air under pressure from said fluid motor means;

a Valve stem arranged within said casing structure in coaxial relation to said column and adapted to be moved selectively in a direction longitudinally thereof to two limit positions;

spring means biasing said stem to one of said two limit positions thereof;

a first valve eiement mounted on said stem and having a surface adapted to be acted upon by the pressure of air under pressure within said casing structure and within said column when said stem is in one 0f said two limit positions thereof;

a first valve seat adjacent the upstream end of said passageway adapted to be cooperatively engaged by a portion of said surface of said first valve element to close said passageway when said stern is in the other of said two limit positions thereof;

a second valve element mounted on said stem defining an aperture extending substantially in said direction longitudinally of said column and forming a portion lof said passageway, said second valve element having a surface adapted to be acted upon by the pressure of air under pressure within said casing structure and within said column when said stem is in said other of said two limit positions thereof;

a second valve seat intermediate said upstream end of said passageway and said orifice of said casing structure adapted to be cooperatively engaged by a portion of the surface of said second valve element situated on the side thereof remote from said orifice;

and an insulating rod arranged inside said column adapted to be moved in said direction longitudinally of said column to operate said stern positively from the bottom of said column.

l1. A valve for the control of a iiow of gas under pressure comprising a casing structure having a longitudinal axis and deining a passageway extending substantially along said longitudinal axis, said casing structure further defining an orice allowing gas under pressure contained within said casing structure to escape therefrom along said longitudinal axis;

a valve stem housed within and arranged along said longitudinal axis of said casing structure and adapted to be moved selectively in a direction longitudinally thereof to two limit positions;

spring means biasing said stem to one of said two limit positions thereof;

a first valve element mounted on said stem and having a surface adapted to be acted upon by the pressure of gas under pressure within said casing structure when said stem is in one of said two limit positions thereof;

a first valve seat adjacent the upstream end of said passageway adapted to be cooperatively engaged by a portion of said surface of said rst valve element to close said passageway when said ste-m is in the other of said two limit positions thereof;

a second valve element mounted on said stern defining an aperture extending substantially in the direction of said longitudinal axis of said casing structure and forming a portion of said passageway;

and a second valve seat intermediate said upstream end of said passageway and said orifice of said casing structure adapted to be cooperatively engaged by the side of said second valve element remote from said orifice.

References Cited in the file of this patent UNITED STATES PATENTS Trencham Apr. 4, 1939 Prince Nov. 12, 1940 Forwald Nov. 22, 1955 Williams et al. Apr. 7, 1959 Hoge Oct. 201, 1959 Schulz Dec. 13, 1960 Baker Dec. 20, 1960 FOREIGN PATENTS Great Britain Mar. 25, 19418

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3170055 *Aug 28, 1961Feb 16, 1965Asea AbLatching means for air-blast circuit breaker
US4215253 *Dec 28, 1978Jul 29, 1980Tilman Ted NHigh direct and alternating current switch
Classifications
U.S. Classification218/78, 137/596.1, 200/82.00B
International ClassificationH01H33/02, H01H33/56, H01H33/70, H01H33/867
Cooperative ClassificationH01H33/56
European ClassificationH01H33/56