JP6190633B2 - Pumping unit - Google Patents

Description

  The present invention relates to a pump unit.

  A pump unit for pumping the liquid fuel stored in the underground tank and pumping it to the nozzle is mounted in the housing of the fuel supply device. The pump unit casing houses a strainer, a check valve, a pump, a gas separation chamber, a gas-liquid separation chamber, a float valve, and other devices. A motor is provided outside the casing, and a pump is provided via a pulley. (For example, refer to Patent Document 1).

  Also, the pump unit pumps the liquid fuel stored in the underground tank and gas is mixed into the liquid fuel in the process of discharging the oil liquid from the pump discharge port, so the fluid discharged from the discharge port in the gas-liquid separation chamber is gas The gas-liquid separation chamber is separated into an enriched liquid (liquid containing gas) and the liquid, and the liquid is sent to the flowmeter, and the gas-enriched liquid inflow hole communicates between the gas-liquid separation chamber and the gas separation chamber. The gas-enriched liquid obtained from the liquid is supplied to the gas separation chamber.

  Also, in the gas separation chamber, when the liquid level of the gas (air) separated by the supply of the gas-enriched liquid reaches a predetermined height, the float valve moves up by the float rising and lowering according to the change in the liquid level. Is opened and the gas-removed liquid is supplied to the pump suction side.

  The pump unit is provided with a rotor chamber for accommodating the rotor of the pump adjacent to the gas separation chamber. One end of a rotor shaft for rotating the rotor passes through the rotor, and the other end extends to the opposite side of the gas separation chamber and projects to the outside of the casing. On both sides of the rotor mounting portion of the rotor shaft, bearings are provided for allowing the rotor shaft to rotate smoothly by preventing the rotor shaft from swinging.

JP 2008-95612 A

  In the above-described conventional configuration, the rotor shaft penetrating the rotor is supported by a pair of bearings arranged on both sides of the rotor, thereby suppressing vibration during rotation of the rotor shaft. These bearings reduce friction with a lubricant (grease), and a bearing holding portion that holds the bearing is provided with a lubricant reservoir filled with the lubricant. However, in the pump unit, in order to achieve a more compact configuration, the arrangement position of the bearing is limited, and the bearing that supports the rotor shaft is held because the rotor shaft is disposed so as to cross the gas separation chamber. A bearing holding portion is provided on the inner wall of the gas separation chamber. The gas-enriched liquid discharged from the gas-enriched liquid inflow hole into the gas separation chamber is separated into liquid and oil vapor (vapor) in the gas separation chamber, and the oil vapor (vapor) may flow into the bearing holder. There is. Since the bearing holding portion is filled with a lubricant, when the oil vapor (vapor) comes into contact with the lubricant in the bearing holding portion, there is a problem that the lubricant flows out and the bearing becomes insufficiently lubricated.

  In view of the above circumstances, an object of the present invention is to provide a pump unit that solves the above problems.

In the present invention, a pump provided in the casing;
A gas-liquid separation chamber for separating the fluid discharged from the pump into a liquid and a gas-enriched liquid;
A gas separation chamber for separating the gas-enriched liquid into a gas and a liquid;
A gas-enriched liquid inflow hole through which the gas-enriched liquid flows into the gas separation chamber;
A rotor chamber for accommodating the rotor of the pump;
A rotor shaft having one end protruding outside the casing and the other end connected to the rotor of the pump;
A bearing that rotatably supports the rotor shaft;
A bearing holder provided in the gas separation chamber and holding the bearing;
In the pump unit with
A cylindrical partition member provided on the bearing holding portion and covering an outer periphery of the rotor shaft so as to define the bearing and the gas separation chamber ;
An oil seal provided in the bearing holding portion to prevent fluid from flowing into the bearing;
It is characterized by providing .

  According to the present invention, the fluid containing the gas-enriched liquid discharged from the gas-enriched liquid inflow hole and the oil vapor (vapor) separated from the gas-enriched liquid flows into the bearing and the bearing holding portion. Therefore, the lubricant does not flow out by coming into contact with the fluid, the lack of lubrication in the bearing is eliminated, and the maintenance is not frequently performed, so that the maintainability is improved.

1 is a schematic configuration diagram schematically illustrating an embodiment of a pump unit according to the present invention. It is a figure which shows the flow of the liquid in a pump unit in order. It is a longitudinal cross-sectional view which shows the internal structure of the casing which follows the BB line in FIG. It is a longitudinal cross-sectional view which follows the AA line in FIG. It is a cross-sectional view of the gas separation chamber showing the attachment structure of the liquid inflow prevention hand member. It is a longitudinal cross-sectional view of the gas separation chamber which shows the attachment structure of a liquid inflow prevention member. It is a longitudinal cross-sectional view which shows the structure of the pump unit of a modification. It is a longitudinal cross-sectional view which expands and shows the X section in FIG.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

Embodiment 1
FIG. 1 is a schematic configuration diagram schematically showing an embodiment of a pump unit according to the present invention. FIG. 2 is a diagram illustrating the flow of liquid in the pump unit in order. In FIG. 1, in order to show the overall configuration of the pump unit in an easy-to-understand manner, each part is described by shifting the vertical position, the front-rear position, and the left-right position, and are described in different locations from the positions shown in FIGS. Has been.

  As shown in FIGS. 1 and 2, the pump unit 10 is mounted on a fuel supply device that supplies liquid fuel (hereinafter referred to as “liquid”) such as gasoline or light oil, and is stored in the underground tank 12. The air bubbles are pumped up, and bubbles contained in the liquid are separated and fed to the flow meter 20. The liquid fuel measured by the flow meter 20 is supplied to the fuel tank of the vehicle through the hose and nozzle of the fuel supply device.

  In the pump unit 10, an inflow chamber 31, a rotor chamber 32, a gas-liquid separation chamber 33, an outflow path 34, and a gas separation chamber 36 are formed inside the casing 30. The inflow chamber 31 is provided with a strainer mounting chamber 38 communicating with an inflow port 37 that opens to the bottom of the casing 30 and a check valve mounting chamber 39 adjacent to the downstream side (outflow side) of the strainer mounting chamber 38. It has been. The strainer mounting chamber 38 and the check valve mounting chamber 39 are provided adjacent to the same side surface of the casing 30. Further, the outflow side of the strainer mounting chamber 38 and the inflow side of the check valve mounting chamber 39 are communicated with each other by a communication path 45.

  The strainer mounting chamber 38 includes a first opening 38a machined from the side surface of the casing 30, and a strainer receiving portion 38b formed at the back of the opening 38a. A cylindrical strainer 44 is accommodated in the strainer mounting chamber 38.

  The strainer 44 is inserted through the first opening 38a, one end (insertion side end) is in contact with the strainer receiving portion 38b, and the other end (extraction side end) is screwed into the first opening 38a. It abuts on the lid member 41A. The first lid member 41 </ b> A is fastened so as to close the opening 38 a of the strainer mounting chamber 38, and holds the strainer 44 in the strainer mounting chamber 38.

  The liquid sucked from the inlet 37 by driving the pump is filtered by the strainer 44 and then flows into the check valve mounting chamber 39 through the communication passage 45.

  The check valve mounting chamber 39 is provided on the downstream side of the strainer mounting chamber 38, and includes a second opening 39 a processed from the side surface of the casing 30 and a valve seat 39 b that is opened and closed by the inflow side check valve 40. An inflow check valve 40 is attached to the check valve mounting chamber 39 so as to be openable and closable.

  The inflow check valve 40 is urged in the valve closing direction by the spring force of the coil spring 42, and opens the valve seat 39b when the pump is driven, and closes the valve seat 39b when the pump is stopped. The coil spring 42 is held by a second lid member 41B that closes the second opening 39a. The valve seat 39 b is provided with a communication opening 39 c communicated with the communication passage 45. Further, on the ceiling of the check valve mounting chamber 39, an outflow opening 39d for allowing fluid to flow out to the rotor chamber 32 of the gear pump 48 is provided.

  The inflow side check valve 40 operates to a valve opening position or a valve closing position that opens or closes the communication opening 39c in accordance with fluctuations in negative pressure caused by pump driving or pump stop. Accordingly, when the inflow check valve 40 is opened, the communication opening 39c is opened, and the liquid fuel that has flowed through the communication passage 45 passes through the outflow opening 39d disposed upward from the communication opening 39c. And flows out to the suction-side flow path 46.

  On the downstream side of the check valve mounting chamber 39, a suction-side flow path 46 and the rotor chamber 32 that are in communication with the suction side of the rotor chamber 32 are provided. A gear pump 48 is provided in the rotor chamber 32. The gear pump 48 includes a rotor 50 that is rotated by receiving the rotational driving force of the motor, and a pinion 52 that is rotationally driven by the rotor 50.

  The rotor 50 is formed in a disc shape corresponding to the inner diameter of the rotor chamber 32, and a plurality of semicircular engaging portions 50a are provided on the disc-shaped plane at a predetermined pitch (interval) in the rotation direction (circumferential direction). One is provided. The pinion 52 is rotatably supported by a rotating shaft 53, and a plurality of semicircular recesses 52a corresponding to the engaging portions 50a of the rotor 50 are provided on the outer periphery at a predetermined pitch (interval). Yes.

  Further, the rotation center of the rotor 50 and the rotation center of the pinion 52 are eccentric in the vertical direction. Between the outer periphery of the pinion 52 and the inner periphery of the rotor 50, a crescent-shaped partition portion 51 corresponding to the amount of eccentricity is provided. The inner peripheral surface 51a of the partition part 51 is a pinion sliding contact surface with which the outer periphery of the pinion 52 is in sliding contact, and the outer peripheral surface 51b of the partition part 51 is a rotor sliding contact surface with which the engaging part 50a of the rotor 50 is in sliding contact.

  When the engaging portion 50a is engaged with the recess 52a of the pinion 52, the rotor 50 is driven to rotate by the motor, and the pinion 52 is also driven to rotate in the same direction. Then, when the negative pressure in the rotor chamber 32 is generated, the inflow side check valve 40 is opened, and the liquid that has passed through the strainer 44 is sucked into the suction port 32 a of the rotor chamber 32. In the gear pump 48, the rotor 50 and the pinion 52 are rotated in the counterclockwise direction, and the liquid sucked from the suction side flow path 46 flows between the recess 52a of the pinion 52 and the engaging portion 50a of the rotor 50, The ink is discharged to the discharge-side flow path 47 communicated with the discharge port 32b of the rotor chamber 32.

  Further, the liquid discharged from the gear pump 48 flows into the gas separation chamber 33 disposed downstream of the discharge side flow path 47. The gas-liquid separation chamber 33 communicates with the filter 54 on the downstream side, and a gas-enriched liquid inlet hole 58 for collecting the gas-enriched liquid containing gas in the gas separation chamber 36 is provided on the side wall. The gas separation chamber 36 is supplied with a gas-enriched liquid and has an atmosphere of oil vapor (vapor) evaporated from the gas-enriched liquid. Therefore, in the gas separation chamber 36, there is a fluid containing a gas-enriched liquid and oil vapor (vapor).

  A return hole 60 for returning the liquid to the rotor chamber 32 of the gear pump 48 is provided at the bottom of the gas separation chamber 36, and an air release hole 62 is provided at the ceiling. The gas separation chamber 36 is provided with a float valve 70 that opens and closes the return hole 60.

  The float valve 70 has a valve portion that opens the return hole 60 when the liquid level of the liquid containing the gas-enriched liquid in the gas separation chamber 36 is equal to or higher than a predetermined height.

  In the gas separation chamber 36, bubbles (gas) contained in the liquid float up in the upper space and are discharged from the atmosphere opening hole 62 into the atmosphere. Further, the liquid from which the bubbles are separated is returned to the suction side flow path 46 through the return hole 60 by opening the float valve 70 when the liquid level reaches a predetermined height.

  In the gas-liquid separation chamber 33, the liquid from which the gas-enriched liquid has been separated is filtered by the filter 54, passes through the outflow path 34, and is supplied to the flow meter 20. The outflow check valve 64 provided in the outflow path 34 is opened by the pressure of the liquid sent out by the gear pump 48.

  The pump unit 10 is provided with a relief valve 80. When the liquid pressure in the flow path increases more than necessary, a part of the liquid filtered by the filter 54 is returned to the rotor chamber 32 of the gear pump 48 by opening the relief valve 80. The relief valve 80 is biased in the valve closing direction by the spring force of the coil spring 82, and corresponds to the difference between the discharge pressure of the outflow path 34 and the resultant force of the spring force of the coil spring 82 plus the suction pressure of the rotor chamber 32. Open and close. Accordingly, the relief valve 80 repeats opening and closing by balancing the resultant force of the coil spring 82, the discharge pressure, and the suction pressure.

[Internal structure of casing 30]
FIG. 3 is a longitudinal sectional view showing the internal structure of the casing. As shown in FIG. 3, insertion holes 102 and 104 are provided in a partition wall 36 c that partitions the gas separation chamber 36 and the rotor chamber 50, and a side wall 36 d that faces the partition wall 36 c in the gas-liquid separation chamber 36, respectively. Bearing holding portions 36a and 36b are provided, and the rotor shaft 100 is inserted into the insertion holes 102 and 104.

  One end 100a of the rotor shaft 100 is inserted into the rotor chamber 32 in the casing 30 and coupled to the rotor 50, and the rotor 50 is supported by a cantilever structure. An intermediate portion of the rotor shaft 100 is rotatably supported by a pair of bearings 93 and 94 disposed in the gas-liquid separation chamber 36. Furthermore, the other end 100b of the rotor shaft 100 protrudes to the outside of the casing 30, and a pulley 110 to which the rotational driving force of the drive motor is transmitted is coupled.

  In this embodiment, the rotational driving force of the drive motor is configured to be transmitted to the rotor shaft 100 via the pulley 110, but the transmission of the rotational driving force of the drive motor to the rotor shaft 100 is The rotation drive shaft of the drive motor and the rotor shaft 100 may be directly connected without passing through the pulley 110 for transmission.

  The bearing holding portions 36a and 36b through which the rotor shaft 100 is inserted are provided so as to protrude toward the interior of the gas separation chamber 36 of the partition wall 36c and the side wall 36d. A bearing 93 and an oil seal 95 are inserted inside the bearing holding portion 36a. Further, a bearing 94 and an oil seal 96 are inserted inside the bearing holding portion 36b.

  As described above, the bearing holding portions 36 a and 36 b having the insertion holes 102 and 104 through which the rotor shaft 100 is inserted are provided on the inner side of the partition wall 36 c and the side wall 36 d of the gas-liquid separation chamber 36 of the casing 30. The rotor shaft 100 supported by the bearings 93 and 94 passes between the bearing holding portions 36a and 36b.

  A cylindrical partition member 200 is covered on the outer periphery of the rotor shaft 100 in the gas separation chamber 36. The partition member 200 is made of, for example, an aluminum alloy, and prevents oil vapor (vapor) in the gas separation chamber 36 from adhering to the bearings 93 and 94. The material of the partition member 200 is not limited to an aluminum member, and may be a metal member.

  In addition, one end (left end) of the partition wall member 200 is fitted into the through hole of the bearing holding portion 36a, and the other end (right end) is fitted into the through hole of the bearing holding portion 36b. Therefore, both ends of the partition member 200 are press-fitted into the holes of the bearing holding portions 36a and 36b, and the partition member 200 is attached so that the internal space 210 formed therein is airtight. Here, since the gas-enriched liquid discharged into the gas separation chamber 36 from the gas-enriched liquid inflow hole 58 can also be prevented from flowing into the bearings 93 and 94, the lubricating oil in the bearing portion flows out by the gas-enriched liquid. This prevents the lubricating oil from flowing out.

  The internal space 210 formed in the partition member 200 is filled with grease (lubricant) 220 and functions as an oil sump for supplying the lubricant to the bearings 93 and 94. is there. Since the rotor shaft 100 is inserted into the partition member 200, the rotor shaft 100 rotates, and grease 220 attached to the outer periphery of the rotor shaft 100 is sent in the axial direction and gradually moved to the bearings 93 and 94. Supplied.

  Further, the partition member 200 can greatly increase the filling amount of the grease 220 in the internal space 210 as compared with the case where oil reservoirs are provided in the bearing holding portions 36a and 36b. Therefore, by providing the pipe-shaped partition wall member 200 and filling the inside with a lubricant, the lack of lubrication of the bearings 93 and 94 can be solved for a long time, and the durability of the bearings 93 and 94 can be improved. .

  The partition member 200 is attached by being inserted from the insertion port 104 of the lid member 150 and fitting to the bearings 93 and 94. However, the partition member 200 can be easily removed by removing the lid member 150 on the side surface of the casing 30. The member 200 can be assembled.

  Furthermore, since the space in the gas separation chamber 36 is used as a space for increasing the installation interval between the two bearings 93 and 94 for supporting the rotor shaft 100, the two bearings 93 and In order to make the installation interval of 94 large, it is not necessary to project the bearing holding portion outside the casing 30. Accordingly, the configuration becomes compact and the size can be reduced.

  The rotor shaft 100 of the rotor 50 extends in the horizontal direction and is supported in a state of passing through the upper space of the gas separation chamber 36. Further, one end (left end) of the rotor shaft 100 is inserted into the rotor chamber 32 and coupled to the shaft of the rotor 50, and the other end (right end) protrudes outside the side surface of the casing 30. Further, a driven pulley 110 is fitted and fixed to the other end of the rotor shaft 100. A driven pulley driven by a motor is provided below the driven pulley 110, and the rotational driving force of the motor is transmitted to the driven pulley 110 via the V belt.

  4 is a longitudinal sectional view taken along line AA in FIG. FIG. 5 is a cross-sectional view of the gas separation chamber showing the mounting structure of the partition wall member. FIG. 6 is a longitudinal sectional view of the gas separation chamber showing the mounting structure of the partition member.

  As shown in FIGS. 4 and 5, the gas enrichment in which the gas-enriched liquid separated from the liquid in the gas-liquid separation chamber 33 is supplied to the partition wall 36 c of the gas separation chamber 36 adjacent to the rotor chamber 23. A liquid inflow hole 58 (shown by a broken line in FIG. 4) is provided.

  The gas-enriched liquid inflow hole 58 supplies the gas-enriched liquid from the gas-liquid separation chamber 33 to the gas separation chamber 36 due to the difference between the discharge pressure discharged from the discharge side of the gear pump 48 and the pressure of the gas separation chamber 36. It is a passage for. Further, the gas-enriched liquid inflow hole 58 is disposed above the bearing holding portion 36a. Therefore, the gas-enriched liquid discharged from the gas-enriched liquid inflow hole 58 to the gas-liquid separation chamber 36 adheres to the bearing holding portion 36a, and the gas-enriched liquid contacts the rotor shaft 100 and the bearings 93 and 94, Lubricating oil may leak.

  As described above, both end portions 202 and 204 of the partition wall member 200 are press-fitted into the openings of the bearing holding portions 36a and 36b. The rotor shaft 100 is inserted into the internal space 210 (lubricant filling space) of the partition member 200. An internal space 210 (lubricant filling space) formed inside the partition wall member 200 is filled with grease 220 for lubricating the bearings 93 and 94.

  The gas-enriched liquid discharged from the gas-enriched liquid inflow hole 58 to the gas separation chamber 36 flows down along the outer periphery of the partition wall member 200. As a result, the grease 220 filled in the partition wall member 200 does not flow out and is continuously supplied to the rotor shaft 100 and the bearings 93 and 94 for a long period of time. Therefore, the maintenance interval between the bearings 93 and 94 and the grease 220 is extended, the maintainability can be improved, and the durability of the bearings 93 and 94 is enhanced.

  As shown in FIGS. 5 and 6, the shielding part 130 is a partition part formed so as to face the partition wall 36 c where the gas-enriched liquid inflow hole 58 adjacent to the rotor chamber 32 is opened. A U-shaped groove 132 is formed between the two. Therefore, the gas-enriched liquid injected from the gas-enriched liquid inflow hole 58 is prevented from being sprayed to the bearing 93 by the shielding part 130 and guided to the side of the bearing holding part 36a along the U-shaped groove 132. As a result, it falls to the bottom of the gas separation chamber 36. A part of the gas-enriched liquid flows on the outer periphery of the partition wall member 200 and falls to the bottom of the gas separation chamber 36.

  Therefore, the supply of the gas-enriched liquid is performed by the shielding part 130 provided between the bearing 93 and the gas-enriched liquid inflow hole 58 and the partition member 200 provided so as to cover the outer periphery of the rotor shaft 100 as described above. Insufficient lubrication in the bearings 93 and 94 is prevented.

[Modification]
FIG. 7 is a longitudinal sectional view showing a configuration of a pump unit according to a modification. FIG. 8 is an enlarged longitudinal sectional view showing a portion X in FIG. 7 and 8, the same parts as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 7, in the pump unit 10 </ b> A, the rotor shaft 100 </ b> A is rotatably supported by bearings 93 </ b> A and 94 </ b> A arranged on both sides of the rotor 50. The bearings 93 </ b> A and 94 </ b> A are sliding bearings and are formed by a cylindrical bush that is a combination of a pair of semicircular metals. The bearings 93A and 94A support the rotor shaft 100A with low friction by the grease 220 supplied to the inner peripheral surface.

  One end 100a of the rotor shaft 100A is coupled to the rotor 50, the other end 100b projects outside the casing 30, and the pulley 110 is coupled. Further, the one end 100a of the rotor shaft 100A does not penetrate the bearing holding portion 36A that holds the bearing 93A, and is housed inside the bearing holding portion 36A.

  The bearing holding portions 36A and 36B that hold the bearings 93A and 94A are provided with grease reservoirs 140 and 150 at positions adjacent to the outer circumferences of the bearings 93A and 94A. The grease reservoirs 140 and 150 are filled with grease (lubricant) 220 from the grease supply port closed by the plugs 141 and 151.

  Further, oil seals 95A and 96A are provided on both axial sides of the bearings 93A and 94A, respectively. The oil seals 95A and 96A prevent the grease 220 from flowing out along the outer periphery of the rotor shaft 100A.

  As shown in FIG. 8, a partition wall member 300 that closes the through hole 160 of the bearing holding portion 36 </ b> A protruding into the gas-liquid separation chamber 36 is provided at the axial end of the one end 100 a of the rotor shaft 100 </ b> A. . The partition member 300 is provided in the insertion hole 102A into which the one end 100a of the rotor shaft 100A is inserted, and closes the through hole 160 from the inside.

  Moreover, the partition member 300 is formed in a lid shape, and prevents the gas-enriched liquid from flowing into the insertion hole 102 </ b> A from the through hole 160. Therefore, when the one end 100a of the rotor shaft 100A does not penetrate the bearing holding portion 36A that holds the bearing 93A, the gas-enriched liquid is formed by the partition member 300 that closes the through-hole 160 that opens to the gas-liquid separation chamber 36. Is prevented from flowing out the grease 220.

  Thus, the grease 220 filled in the bearing 93A does not flow out and is continuously supplied to the rotor shaft 100A and the bearings 93A and 94A for a long period of time. Therefore, the maintenance interval between the bearings 93A, 94A and the grease 220 is extended, the durability of the bearing 93A can be increased, and the maintainability can be improved.

  In the above-described embodiment, the pump unit mounted on the fuel supply apparatus has been described as an example. However, the present invention is not limited to this, and the present invention can of course be applied to pump units mounted on other devices.

  In the above-described embodiment (see FIG. 3), the position of the bearing 94 is located on the inner side (on the gas separation chamber 36 side) with respect to the horizontal direction than the position of the oil seal 96. Of course, the present invention can be applied even if the position is provided on the outer side (pulley side) with respect to the horizontal direction than the position of the oil seal 96.

  Moreover, in the bearing of the said embodiment, although formed with the cylindrical bush which combined a pair of semicircle metal (metal), of course, it is applicable also to bearings, such as a sintered oil-impregnated bearing. is there.

  In the above embodiment, the gas-liquid separation chamber 33 is provided in the horizontal direction. However, the present invention is not limited to this, and the present invention can be applied to the case where the gas-liquid separation chamber 33 is provided in the vertical direction.

  In the above-described embodiment, the configuration for pumping the liquid by the gear pump has been described. However, the present invention is not limited to this, and the present invention can be applied to a pump unit having another type of pump (for example, a vane type pump). is there.

10, 10A Pump unit 12 Underground tank 20 Flow meter 30 Casing 31 Inflow chamber 32 Rotor chamber 32a Suction port 32b Discharge port 33 Gas-liquid separation chamber 34 Outflow channel 35 Bypass channel 36 Gas separation chambers 36a, 36b, 36A, 36B Bearing holder 37 Inlet 38 Strainer mounting chamber 39 Check valve mounting chamber 40 Inflow side check valves 41A and 41B First and second lid members 44 Strainer 45 Communication path 46 Suction side path 47 Discharge side path 48 Gear pump 50 Rotor 51 Partition Portion 52 Pinion 53 Rotating shaft 54 Filter 58 Gas enriched liquid inflow hole 60 Return hole 64 Outflow side check valve 70 Float valve 80 Relief valve 93, 94, 93A, 94A Bearing 95, 96, 95A, 96A Oil seal 100 Rotor shaft 102, 104 Insertion hole 110 Driven pulley 130 Shield part 132 U-shape Grooves 140, 150 Grease reservoir 200, 300 Partition member 210 Internal space 220 Grease

Claims (3)

A pump provided in the casing;
A gas-liquid separation chamber for separating the fluid discharged from the pump into a liquid and a gas-enriched liquid;
A gas separation chamber for separating the gas-enriched liquid into a gas and a liquid;
A gas-enriched liquid inflow hole through which the gas-enriched liquid flows into the gas separation chamber;
A rotor chamber for accommodating the rotor of the pump;
A rotor shaft having one end protruding outside the casing and the other end connected to the rotor of the pump;
A bearing that rotatably supports the rotor shaft;
A bearing holder provided in the gas separation chamber and holding the bearing;
In the pump unit with
A cylindrical partition member provided on the bearing holding portion and covering an outer periphery of the rotor shaft so as to define the bearing and the gas separation chamber ;
An oil seal provided in the bearing holding portion to prevent fluid from flowing into the bearing;
Pump unit, characterized in that it comprises a. The partition member has an end portion is fitted into the bearing holding portion, is filled with a lubricant between the rotor shaft, according to claim 1, characterized in that it comprises a space for retention of lubricant Pumping unit. A communication portion provided in the bearing holding portion and communicating from the outside to the inside of the space;
A closing part for closing the opening of the communication part;
The pump unit according to claim 2, further comprising:

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