EP0277582A2 - Thermostatic valve and oil filter unit for compressors - Google Patents
Thermostatic valve and oil filter unit for compressors Download PDFInfo
- Publication number
- EP0277582A2 EP0277582A2 EP88101074A EP88101074A EP0277582A2 EP 0277582 A2 EP0277582 A2 EP 0277582A2 EP 88101074 A EP88101074 A EP 88101074A EP 88101074 A EP88101074 A EP 88101074A EP 0277582 A2 EP0277582 A2 EP 0277582A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- oil
- thermostatic
- valve
- fact
- casing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 239000003921 oil Substances 0.000 description 30
- 238000005461 lubrication Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000010725 compressor oil Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/04—Heating; Cooling; Heat insulation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
- F04C29/026—Lubricant separation
Definitions
- This invention refers to a device for the circulation of the oil for lubrication and for cooling the air in compressors of the rotary type and, in particular, is directed to a special arrangement of a thermostatic valve and recycling filter for the lubrication and cooling oil to considerably simplify the construction of the compressor and improve lubrication in operating conditions of particularly low temperatures; besides this, it allows easy inspection and/or substitution of both the filter and the thermostatic valve.
- the thermostatic valve comprises a hollow cylindrical body sealingly housed inside the above-mentioned casing, and a closing cylindrical member operated by a thermostatic control element; the cylindrical member slides between two extreme operative positions in which it opens or closes some exit ports for the oil towards a passage for the direct recycling of the oil from the compressor oil chamber to the stator chamber, and respectively for connecting a cooling circuit towards the above mentioned recycling filter.
- the oil filter and the thermostatic valve are made accessible by removing a closure cover of said cylindrical casing so as to be easily removable for maintenance or substitution.
- a rotary air compressor of the type with radial blades comprises an external cylindrical body defining an annular chamber 11, only partially shown, in which a suitable quantity of oil necessary for the operation of the compressor is contained, and an internal cylindrical body 12, also referred to as stator, which defines a chamber 13 in which, as per se known, a blade rotor rotates (not shown).
- stator also referred to as stator
- stator which defines a chamber 13 in which, as per se known, a blade rotor rotates (not shown).
- the whole compressor, with all its relative automatic control devices, is not shown completely here, with the exception of the oil circulation device, since it does not constitute an innovative part of the present invention and is realizable in any of several ways.
- a cylindrical casing 14 In a position underneath the body 10 of the compressor and placed in direct contact with the lower part of the oil chamber 11 is a cylindrical casing 14 in which a thermostatic valve 15 and a filter 16 are housed or coaxially arranged in alignment with each other.
- the thermostatic valve 15 comprises a hollow cylindrical body 17 in the form of a cup-shaped element, the closed bottom 17a of which is facing towards the filter 16.
- the inside of the hollow body 17 is in communication with the oil chamber 11 of the compressor by means of a lateral inlet hole 18 aligned with a hole 19 which opens towards the bottom of the oil chamber 11.
- a first set of exit ports 20 which ports communicate, through longitudinal passages or channels 21 with the space 22 in which the filtering cartridge 23 is housed, said space 22 for the filter being a continuation of the space in which the valve 15 is housed.
- the inside 24 of the filter cartridge in its turn communicates on one side with a conduit 25 which rectckes the oil directly or through suitable distributors (not shown) inside the chamber 13 of the stator.
- valve body 17 terminates in correspondence with a second exit port 26 in the casing 14 which is connected to an inlet port 27 of the filter space 22 by means of a branched off circuit for cooling the oil, comprising a heat exchanger 28.
- an axially hollow cylinder or closing member 29 which sealingly slides between a first end position, shown in Fig. 1, against an annular edge 30 of a closure cover 31, in which position the closing member completely closes the oil passage towards the second exit port 26, and a second operative position opposite the preceding one, in which the closing member 29 closes the radial ports 20 of direct communication with the filter 16 against an annular seat 32 on the bottom of the cup-shaped element mentioned above.
- the cylindrical closing member 29 is moved between its two end positions by means of a thermostatic control element 33 for example of the wax type, or equivalent element, which, through changes of the temperature of the oil coming from the chamber 11 is extended or retracted thus moving the closing member mentioned above.
- a thermostatic control element 33 for example of the wax type, or equivalent element, which, through changes of the temperature of the oil coming from the chamber 11 is extended or retracted thus moving the closing member mentioned above.
- the bulb of the thermostatic element 33 is fastened to a supporting member inside the cylinder 29 surrounded by a set of holes 34 for the passage of the oil, while the rod 35 of the thermostatic element is fastened to the cover 31 in any suitable way; for example, by means of a cup member 36 housed in a seat in the cover 31 and pushed towards the above-mentioned shaft by a spring 37.
- a second spring 38 is disposed between the bottom 17a of the valve body 17 and the perforated support member 17b for the thermostatic element 33 in the closing cylinder 29 to push the cylinder towards the above mentioned first operative position, thus opposing the action of the thermostatic element 33.
- the cartridge 23 of the filter can be withdrowen and removed simply by removing the end closure cover 39 of the housing 14 since the cartridge 23 of the filter is fixed to the cover 39 by means of a tie rod 40 as shown.
- the cylinder 29 of the thermostatic valve 15, operated by the element 33 sensitive to temperature moves gradually from one position, where the passage 26 towards the conduit leading to the heat exchanger 28 is completely closed and the direct passages 20 and 21 to the oil filter 16 are completely open, to the opposite position, where the condition of the above-mentioned passages is reversed.
- the thermostatic bulb 33 with which it comes in contact pushes out the rod 35 and forces the closing cylinder 29 to move towards the right, partially closing the passage ports 20 leading to the oil filter and uncovering contemporaneously part of the port 42 towards the opening 26 connected to the conduit towards the cooler 28. Therefore, part of the oil will begin to flow through the appropriate holes 34 in the closing cylinder, and from these towards the exit 26 connected to the cooler 28.
- the cylinder 29 When the maximum calibration temperature is reached, the cylinder 29 will have completely closed the direct passage towards the filter 16 and all the oil will have to circulate through the cooler 28 to return to the filter 16 by an appropriate return conduit connected to the inlet port 27 of the filter housing.
- a device is supplied for the circulation and cooling of the oil passing from the oil chamber of a rotary compressor to the stator chamber, which makes use of a particular arrangement of a unit comprising a thermostatic valve and an oil circulation filter, housed and aligned in a single casing positioned underneath and in direct contact with the oil chamber of the compressor.
- a unit comprising a thermostatic valve and an oil circulation filter, housed and aligned in a single casing positioned underneath and in direct contact with the oil chamber of the compressor.
Abstract
Description
- This invention refers to a device for the circulation of the oil for lubrication and for cooling the air in compressors of the rotary type and, in particular, is directed to a special arrangement of a thermostatic valve and recycling filter for the lubrication and cooling oil to considerably simplify the construction of the compressor and improve lubrication in operating conditions of particularly low temperatures; besides this, it allows easy inspection and/or substitution of both the filter and the thermostatic valve.
- This is obtained, according to the innovative principles of this invention, by coaxially arranging the thermostatic valve and the oil filter in a single cylindrical casing underneath and in direct contact with the oil chamber of the compressor, so as to reduce the space occupied and, at the same time, simplify construction and maintenance.
- In particular, the thermostatic valve comprises a hollow cylindrical body sealingly housed inside the above-mentioned casing, and a closing cylindrical member operated by a thermostatic control element; the cylindrical member slides between two extreme operative positions in which it opens or closes some exit ports for the oil towards a passage for the direct recycling of the oil from the compressor oil chamber to the stator chamber, and respectively for connecting a cooling circuit towards the above mentioned recycling filter. Preferably, the oil filter and the thermostatic valve are made accessible by removing a closure cover of said cylindrical casing so as to be easily removable for maintenance or substitution.
- These and further characteristics of the device according to the present invention will be shown in the description that follows with reference to the attached drawings in which:
- Fig. 1 is a cross-sectional view of the lower part of a generic rotary air compressor, at the point in corrrespondence with the longitudinal axis of the casing housing the filter and the thermostatic valve;
- Fig. 2 is a section according to the line 2-2 of figure 1.
- A rotary air compressor of the type with radial blades, as per se known, comprises an external cylindrical body defining an
annular chamber 11, only partially shown, in which a suitable quantity of oil necessary for the operation of the compressor is contained, and an internalcylindrical body 12, also referred to as stator, which defines achamber 13 in which, as per se known, a blade rotor rotates (not shown). The whole compressor, with all its relative automatic control devices, is not shown completely here, with the exception of the oil circulation device, since it does not constitute an innovative part of the present invention and is realizable in any of several ways. - In a position underneath the
body 10 of the compressor and placed in direct contact with the lower part of theoil chamber 11 is acylindrical casing 14 in which athermostatic valve 15 and afilter 16 are housed or coaxially arranged in alignment with each other. - In particular, the
thermostatic valve 15 comprises a hollowcylindrical body 17 in the form of a cup-shaped element, the closedbottom 17a of which is facing towards thefilter 16. The inside of thehollow body 17 is in communication with theoil chamber 11 of the compressor by means of alateral inlet hole 18 aligned with ahole 19 which opens towards the bottom of theoil chamber 11. - Near the
bottom 17a of thevalve body 17 a first set ofexit ports 20 has been provided which ports communicate, through longitudinal passages orchannels 21 with thespace 22 in which thefiltering cartridge 23 is housed, saidspace 22 for the filter being a continuation of the space in which thevalve 15 is housed. Theinside 24 of the filter cartridge in its turn communicates on one side with aconduit 25 which rectckes the oil directly or through suitable distributors (not shown) inside thechamber 13 of the stator. - The other open end of the
valve body 17 terminates in correspondence with asecond exit port 26 in thecasing 14 which is connected to aninlet port 27 of thefilter space 22 by means of a branched off circuit for cooling the oil, comprising a heat exchanger 28. - Inside the
valve body 17 is an axially hollow cylinder or closingmember 29 which sealingly slides between a first end position, shown in Fig. 1, against anannular edge 30 of aclosure cover 31, in which position the closing member completely closes the oil passage towards thesecond exit port 26, and a second operative position opposite the preceding one, in which theclosing member 29 closes theradial ports 20 of direct communication with thefilter 16 against anannular seat 32 on the bottom of the cup-shaped element mentioned above. - The
cylindrical closing member 29 is moved between its two end positions by means of athermostatic control element 33 for example of the wax type, or equivalent element, which, through changes of the temperature of the oil coming from thechamber 11 is extended or retracted thus moving the closing member mentioned above. According to the example shown, the bulb of thethermostatic element 33 is fastened to a supporting member inside thecylinder 29 surrounded by a set ofholes 34 for the passage of the oil, while therod 35 of the thermostatic element is fastened to thecover 31 in any suitable way; for example, by means of acup member 36 housed in a seat in thecover 31 and pushed towards the above-mentioned shaft by aspring 37. Asecond spring 38 is disposed between thebottom 17a of thevalve body 17 and theperforated support member 17b for thethermostatic element 33 in theclosing cylinder 29 to push the cylinder towards the above mentioned first operative position, thus opposing the action of thethermostatic element 33. - It must be explained also that the
cartridge 23 of the filter, like the thermostatic valve, can be withdrowen and removed simply by removing theend closure cover 39 of thehousing 14 since thecartridge 23 of the filter is fixed to thecover 39 by means of atie rod 40 as shown. - The working of the device is as follows: the
cylinder 29 of thethermostatic valve 15, operated by theelement 33 sensitive to temperature moves gradually from one position, where thepassage 26 towards the conduit leading to the heat exchanger 28 is completely closed and thedirect passages oil filter 16 are completely open, to the opposite position, where the condition of the above-mentioned passages is reversed. - Therefore, when the oil entering the body of the thermostatic valve from the
chamber 11 through thehole 18 has a temperature below a certain determined value, it passes through theports 20 left uncovered by thehollow cylinder 29 and from these, by means of theslots 21 on the external wall of thevalve body 17 it directly reaches theadjacent space 22 where thecartridge 29 of the oil filter is housed and, passing through the filter, it goes into the stator-rotor unit of the compressor by means of aconduit 25. - Gradually as the oil heats up, the
thermostatic bulb 33 with which it comes in contact pushes out therod 35 and forces the closingcylinder 29 to move towards the right, partially closing thepassage ports 20 leading to the oil filter and uncovering contemporaneously part of theport 42 towards the opening 26 connected to the conduit towards the cooler 28. Therefore, part of the oil will begin to flow through theappropriate holes 34 in the closing cylinder, and from these towards theexit 26 connected to the cooler 28. - When the maximum calibration temperature is reached, the
cylinder 29 will have completely closed the direct passage towards thefilter 16 and all the oil will have to circulate through the cooler 28 to return to thefilter 16 by an appropriate return conduit connected to theinlet port 27 of the filter housing. - When the temperature of the oil decreases, the
thermostat bulb 33 cools as a consequence, causing therod 35 to retract into the same bulb consequently moving towards the left thecylinder 29 which, passing through intermediate positions, will move to the above mentioned first operative positon. - From what has been said and shown, it is evident that a device is supplied for the circulation and cooling of the oil passing from the oil chamber of a rotary compressor to the stator chamber, which makes use of a particular arrangement of a unit comprising a thermostatic valve and an oil circulation filter, housed and aligned in a single casing positioned underneath and in direct contact with the oil chamber of the compressor. In this was, not only is the whole device simplified constructionally, making its parts easily accessible for maintenance or control, but also at the same time heat losses are reduced by maintaining the circulation of oil at an adequate temperature for a good working of the compressor even in particularly difficult conditions, with very cold or very low ambient temperatures.
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT88101074T ATE62324T1 (en) | 1987-02-02 | 1988-01-26 | UNIT FOR COMPRESSORS CONSISTING OF THERMOSTATIC VALVE AND OIL FILTER. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2071887U | 1987-02-02 | ||
IT8720718U IT209903Z2 (en) | 1987-02-02 | 1987-02-02 | THERMOSTATIC VALVE AND OIL FILTER GROUP, FOR COMPRESSORS. |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0277582A2 true EP0277582A2 (en) | 1988-08-10 |
EP0277582A3 EP0277582A3 (en) | 1989-05-03 |
EP0277582B1 EP0277582B1 (en) | 1991-04-03 |
Family
ID=11171036
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88101074A Expired - Lifetime EP0277582B1 (en) | 1987-02-02 | 1988-01-26 | Thermostatic valve and oil filter unit for compressors |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0277582B1 (en) |
AT (1) | ATE62324T1 (en) |
DE (1) | DE3862202D1 (en) |
ES (1) | ES2022472B3 (en) |
IT (1) | IT209903Z2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0639712A1 (en) * | 1993-07-21 | 1995-02-22 | Carrier Corporation | Compressor with integral filter |
EP0721066A3 (en) * | 1994-12-09 | 1998-02-11 | Hansa Metallwerke Ag | Piston compressor for refrigeration systems, in particular for air-conditioning systems |
WO2002084124A1 (en) * | 2001-04-17 | 2002-10-24 | Tm.C. S.P.A. Termomeccanica Compressori | Screw compressor unit with incorporated oil cooling |
US6719546B2 (en) * | 2001-10-30 | 2004-04-13 | Kaeser Kompressoren Gmbh | Arrangement for controlling the flow of a coolant fluid in a compressor |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008051267A1 (en) * | 2008-10-10 | 2010-04-15 | Mahle International Gmbh | thermostatic valve |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1134224A (en) * | 1965-05-03 | 1968-11-20 | Hymatic Eng Co Ltd | Improvements relating to compressors |
DE2854762A1 (en) * | 1978-12-19 | 1980-06-26 | Bayerische Motoren Werke Ag | IC engine lubricating oil thermostatic control - has axially moving valve flanged to oil filter cover for compact assembly |
US4537346A (en) * | 1983-10-17 | 1985-08-27 | Standard-Thomson Corporation | Fail-safe oil flow control apparatus |
DE2500046C2 (en) * | 1975-01-02 | 1987-01-15 | Sullair Europe Corp., 8192 Geretsried, De |
-
1987
- 1987-02-02 IT IT8720718U patent/IT209903Z2/en active
-
1988
- 1988-01-26 DE DE8888101074T patent/DE3862202D1/en not_active Expired - Lifetime
- 1988-01-26 ES ES88101074T patent/ES2022472B3/en not_active Expired - Lifetime
- 1988-01-26 EP EP88101074A patent/EP0277582B1/en not_active Expired - Lifetime
- 1988-01-26 AT AT88101074T patent/ATE62324T1/en not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1134224A (en) * | 1965-05-03 | 1968-11-20 | Hymatic Eng Co Ltd | Improvements relating to compressors |
DE2500046C2 (en) * | 1975-01-02 | 1987-01-15 | Sullair Europe Corp., 8192 Geretsried, De | |
DE2854762A1 (en) * | 1978-12-19 | 1980-06-26 | Bayerische Motoren Werke Ag | IC engine lubricating oil thermostatic control - has axially moving valve flanged to oil filter cover for compact assembly |
US4537346A (en) * | 1983-10-17 | 1985-08-27 | Standard-Thomson Corporation | Fail-safe oil flow control apparatus |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0639712A1 (en) * | 1993-07-21 | 1995-02-22 | Carrier Corporation | Compressor with integral filter |
EP0721066A3 (en) * | 1994-12-09 | 1998-02-11 | Hansa Metallwerke Ag | Piston compressor for refrigeration systems, in particular for air-conditioning systems |
WO2002084124A1 (en) * | 2001-04-17 | 2002-10-24 | Tm.C. S.P.A. Termomeccanica Compressori | Screw compressor unit with incorporated oil cooling |
US6719546B2 (en) * | 2001-10-30 | 2004-04-13 | Kaeser Kompressoren Gmbh | Arrangement for controlling the flow of a coolant fluid in a compressor |
Also Published As
Publication number | Publication date |
---|---|
ES2022472B3 (en) | 1991-12-01 |
ATE62324T1 (en) | 1991-04-15 |
DE3862202D1 (en) | 1991-05-08 |
EP0277582A3 (en) | 1989-05-03 |
EP0277582B1 (en) | 1991-04-03 |
IT8720718V0 (en) | 1987-02-02 |
IT209903Z2 (en) | 1988-11-04 |
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