US 2413461 A
Description (OCR text may contain errors)
Patented Dec. 31, 1946 UNITED PUMP John Mann, Seneca Falls, N. 1, assignoi: to
Goulds Pumps, Inc., Seneca Falls, N. Y.",-a corporation of New York Application December 8, 1943, Serial No. 513,131
2 Claims. (01. 103-404) My invention relates to pumps, and more particularly to a pump of the type in which the pump contains a reserve supply of liquid which, when the rotor is operating, acts as a piston to enable the pump to handle gases, liquids, or a mixture of gases and liquids.
An object of'my invention is to provide a more compact, eillcient pump which is completely selfpriming and is adapted to handle gases, liquids, or a mixture of gases and liquids.
Another object of my invention is to Provide a so-called liquid piston pump which is economical to build, efiicient in operation, andaccess to the interior of which may be attained quickly and with a minimum of effort.
My invention further contemplates the provision of a double suction liquid piston pump in which the casing is made in two parts, one part containing the suction and discharge connections. and the other part constituting a cover part containing portions of the suction and discharge passages which may be conveniently removed to enable access to the interior of the pump without disturbing the suction and discharge connections.
Other objects and advantages of my invention will be more particularly pointed out in the claims, and will be apparent'from the following description, when taken in connection with the following drawing, in which:
Fig. l is an end elevation of the pump of my invention;
Fig. 2 is a sectional view taken substantially on the line 22 of Fig. l in the direction indicated by the arrows.
The pump of my invention comprises a support bracket, generally indicated by the numeral II, a main casing part I 2. and a cover part l3.
The support bracket H has a depending part l4 by which the pump may be suitably mounted, and contains a housing IS in which suitable bearing assemblies l'l may be supported. The support bracket has a plate or pump bracket II to which the main casing part may be bolted, as indicated at it.
.A pump shaft 2i is connected to an electric motor or other prime motor, not shown. The motor extends through the bearing housing l6 through an opening 22 provided in the pump bracket plate It and has suitably keyed thereto substantially at the end thereof a rotor or impeller, generally indicated bythe numeral 23.
Formed in the main casing part i2 is a bore or cavity 24 for the reception of suitable packing 23 which is held in position by a suitable packing gland assembly 21. The main casing part i2 is also provided with two threaded openings 21 and 23. The threaded opening 21 constitutes the suction connection for the pump and has suitably threaded therein a suction pipe 23. The threaded opening 28 constitutes the discharge connection and has suitably threaded therein a discharge pipe 3i. A passage 32 is provided in the main casing part and has access through a port 33 to the pump impeller 23.
. Similarly the discharge connection is connected through a passage 34 to a port '33 which has access to the pump impeller or rotor 23.
The suction passage 32 has a cross over passage 31 which is connected to a passage 38 formed in the cover part i3. The passage 33 has access through a port 39 to the pump impeller'or rotor. Similarly the passage 34 is, connected by a cross over passage 4| to a passage 42 formed in the cover part i3. The passage 42 has access to the impeller through a port 43. Thus liquid entering through the suction pipe branches out through the passages 32 and 38 so that the liquid -enters the impeller or rotor from both sides through the ports 33 and 39. Liquid discharged from the impeller is discharged at both sides of the impeller through the ports 36 and 43, passages 34 and 42, and thence to the discharge pipe 3i.
Formed partly in the main casing part and partly in the cover part is a channel 44 which I is adjacent the periphery of the blades of the impeller 45 and is adapted to receive the liquid discharged therefrom. .This passage 44, as shown most clearly in Fig. 1, is of small cross sectional area adjacent the suction ports 33 and 33, as indicated at 43. The channel gradually increases in cross sectional area until it attains its maximum cross sectional area about at the point 41. From approximately this point the channel gradually decreases in cross sectional area to the discharge ports 36 and 43 and at the point 48 vanishes entirely. Between the ends 46 and 48 of the channel a bridge, indicated at 49 in the drawing, is formed which constitutes a part of the. casing in which no channel is formed. In this portion of the casing the blades make a close running fit with the casing.
The pump of my invention has special application where it is located in a sump or other supply of water. In such case it is sometimes desirable that the pump shall drain when the I sump is substantially dry and no liquid is to be pumped out of the source of supply. When used for this purpose an opening 5| is provided inthe bottom of the main casing part l2, which is connected to a passage 52 and may be connected to a pipe 53. When employed in a sump the pipe 53. may be left open so that when the water level of the liquid being pumped drops, the liquid level in the pump will stand at the same height as in .the source of supply.
Since the leakage opening ii is preferably small, a passage, indicated by the numeral 54,
may be provided the pump casing so that 'riphery by centrifugal force.
when the liquid in the sump or other source of supply rises, liquid may enter the pump and flow through the passage 56 so as to quickly flood the pump when the liquid in the source of supply has reached the desired level at which pur'nping should occur. With this arrangement the pump is completely self-priming.
For certain services it is not necessary to drain the pump, and either the opening 5|, 52 may be omitted entirely or the pipe 53 may be provided with a valve. Y
In this latter case the initial priming of the pump is accomplished by partially filling the pump casing with water. This may be accomplished through a priming opening, not shown, or through the suction or discharge pipes 29 or 3| if more convenient. If the drain pipe 53 is left open and the pump is in. a sump, the pump will automatically prime itself when the water level rises.
Rotation of the impeller or rotor throws the water out between the blades toward the pe- At the same time velocity is imparted to the liquid in the segmental channel. The air, being lighter than the liquid, is not displaced by centrifugal force toward the periphery to as great an extent as the liquid, and remains adjacent the center of the casing. The channel has its maximum cross sectional area approximately midway between the suction and discharge ports and decreases in cross sectional area toward the suction port J and also toward the discharge port.
As a pair of blades approaches the discharge port the liquid is forced between them down toward the center of the blades, due to the decreasing cross sectional area of the channel which is insufiicient to accommodate all the liquid. This, in effect, provides a positive water piston action pushing the air at the center out through the discharge ports 36 and 43 and into the discharge pipe 3|. As the pair of blades pass the bridge 49 the space between the blades is completely filled with. liquid which is retained therein until the bridge or sealing surface 49 between the suction and discharge ports has been passed.
When the pair of blades under consideration has passed the bridge and the roots thereof are in communication with the suction ports 33 and 39, the liquid between the impeller blades is thrown out .into the channel adjacent the end 46 thereof. Thischannel gradually increases in cross sectional area and accommodates more of the liquid thrown out by the blades. This reduces the pressure adjacent the roots of the blades over the suction ports 33 and 39 and air or liquid, or a mixture of air and liquid'is forced up the suction pipe and into the pump. The cycle above described i then continuously repeated as long as the pump is in operation. Thus it will be apparabove.
.ment whereby the liquid enters the pump impeller or rotor from both sides thereof, and similarly the liquid is discharged from the impeller at both sides thereof. Thus the unit is a double suction pump and proper hydraulic balance is secured, Moreover, the suction and discharge pipes 29 and 3| are connected to the main casing part l2 and cross over passages are cored in the main casing part and in the cover part so as to provide the double suction feature mentioned With this arrangement the cover part may be removed, enabling access to the interior of the pump for cleaning or repair, without disturbing the suction and discharge connections.
While I have described the preferred form of I my invention, it will be apparent that various changes and modifications may be made therein,
- particularly in the-form and relationship of parts,
having vanes, an enclosing casing'for said rotor having suction and discharge connections, said casing having a segmental channel of varying cross-sectional area adjacent the periphery of the vanes and having suction and discharge passages on each side of said rotor which have access to the vanes at points spaced inwardfrom the channel, the suction passages being in communication with the suction connection and the discharge passages being in communication with the discharge connection,- and said casing having a drainage connection at the bottom thereof which is at all times open for flow either into or out of the casing.
2. A pump comprising, in combination, a rotor having vanes and a drive shaft upon the end of the drive shaft terminating adjacent said plane ent that the unit is entirely self priming and the reservoir of liquid maintained in the pump acts as a piston to cause the pumping action.
If, when the pump is started, the suction line r is entirely filled with air, the pump will continue to pump air until the suction line has been evacuated, after which the pump will begin to pump liquid in precisely the same manner.
- When the pump is stopped and assuming the drain passage 53 is provided with a valve which is closed, the liquid is retained in the pump casing and the pump is ready without any further primso that it does not extend through the cover part, suction and discharge connections entering said main casing part so that'the cover part may be removed without disturbing the suction and discharge connections, said casing having a segmental channel of varying cross-sectional area adjacent the periphery of the vanes formed partly in the main casing part and partly in the cover part and having a suction and a discharge port on' each side of the roto'r'formed in the main casing part and in the cover part and which are spaced inwardfrom the channel, suction and discharge passages in the main casing part connected respectively to th suction and discharge ports on one side of the rotor and suction and discharge passages in the cover part connected respectively to the suction and discharge ports on the other side of the rotor, the suction passages from opposite sides of the rotor being