JP6102292B2 - Trochoid pump - Google Patents

Description

  The present invention relates to a trochoid pump having an outer rotor and an inner rotor.

  A trochoid pump rotates an outer rotor having inner teeth and an inner rotor having outer teeth in conjunction with each other, and circulates oil using a change in volume of an internal space (pump chamber) formed by the outer rotor and the inner rotor. It is. The trochoid pump is smaller than the liquid pump, and is optimal for downsizing the apparatus. As described in JP-A-11-247766, a trochoid pump is provided with oil in a fluid flow path.

Japanese Patent Laid-Open No. 11-247766

  As described above, the trochoid pump is generally developed as an oil pump whose target is oil. Mainly, durability and availability of high-pressure operation are problems, and it is difficult to circulate fluids other than oil, and it is difficult to install them in piping that circulates fluids other than oil. In other words, it is difficult to use a trochoid pump for a device that needs to circulate a fluid other than oil, and an increase in the size of the device due to the use of a liquid pump has been a problem.

  This invention is made | formed in view of such a situation, and it aims at providing the trochoid pump which can distribute | circulate fluids other than oil while maintaining durability.

  A trochoid pump according to aspect 1 of the present invention has a casing that forms a cylindrical space, an outer rotor that is rotatably disposed in the cylindrical space and has internal teeth, and external teeth that engage with the internal teeth. An inner rotor that is rotatably arranged in the outer rotor and that forms a plurality of pump chambers that repeat expansion and compression with the outer rotor, a suction port and a discharge port that communicate with the cylindrical space, An oil supply port communicating with the internal space formed by the inner peripheral surface of the outer rotor, an oil supply part for supplying oil to the oil supply port, an oil separator for separating oil from the fluid discharged from the discharge port, Is provided.

  In the trochoid pump according to aspect 2 of the present invention, in aspect 1, the oil supply port has an inlet formed in the casing and an outlet formed in the inner peripheral surface of the outer rotor.

  A trochoid pump according to aspect 3 of the present invention is the aspect 1 or 2, wherein the oil supply port is provided in the casing, the clearance formed on the inner peripheral surface of the casing and the outer peripheral surface of the outer rotor, A first oil passage that communicates with the oil supply unit; and a second oil passage that is provided in the outer rotor and communicates between the clearance and the internal space.

  In the trochoid pump according to aspect 4 of the present invention, in aspect 3, the second oil passage is a through-hole penetrating the outer rotor from the outer peripheral surface to the inner peripheral surface.

  In a trochoid pump according to aspect 5 of the present invention, in aspect 3 or 4, a plurality of the second oil passages are provided at intervals in the circumferential direction of the outer rotor.

  In the trochoid pump according to aspect 6 of the present invention, in any of the above aspects 1 to 5, the oil separator causes the separated oil to flow out to the oil supply unit.

  According to the trochoid pump according to aspect 1 of the present invention, since the oil supply port is formed, the oil is supplied into the outer rotor. According to this embodiment, an oil film can be formed on the inner peripheral surface of the outer rotor. As a result, the wear resistance and durability at the contact surface between the outer rotor and the inner rotor can be improved even when fluid other than oil flows. Moreover, it becomes possible to suppress the leakage of the refrigerant at high pressure by forming the oil film. That is, the pump can be operated at a high pressure even for fluid other than oil. Thereby, fluid other than oil can be circulated.

  According to the trochoid pump according to aspect 2 of the present invention, the oil discharged from the oil supply unit is directly supplied to the inner peripheral surface of the outer rotor, so that an oil film can be effectively formed on the inner peripheral surface. . Thereby, durability of a pump can be improved more reliably.

  According to the trochoid pump according to aspect 3 of the present invention, the oil discharged from the oil supply unit is supplied into the outer rotor through the clearance. Thereby, the lubrication between the outer rotor and the casing is improved, and the pump can be driven more efficiently.

  According to the trochoid pump according to aspect 4 of the present invention, since the second oil flow path is a through hole, the manufacture is facilitated. According to the trochoid pump according to aspect 5 of the present invention, the oil film can be efficiently formed on the inner peripheral surface of the outer rotor by the plurality of second oil passages. According to the trochoid pump according to the aspect 6 of the present invention, the separated oil can be used to circulate the oil, thereby reducing an extra device and power and forming an efficient system.

It is a block diagram which shows the structure of the electric power generating apparatus to which the trochoid pump of this embodiment is applied. It is a block diagram which shows the structure of an expander and a generator. It is a block diagram which shows the structure of the trochoid pump of this embodiment. It is sectional drawing which shows the outer rotor of this embodiment. It is a block diagram which shows the structure of the trochoid pump of this embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Each figure used for explanation is a conceptual diagram, and the shape of each part may not necessarily be exact. The trochoid pump of this embodiment is applied to a small power generator using a Rankine cycle.

  As shown in FIG. 1, the power generator includes a refrigerant circulation circuit 1, a trochoid pump 2, a first heat exchanger 3, an oil circulation circuit 4, a second heat exchanger 5, and a third heat exchanger 6. And an expander 7, a generator 8, and a fourth heat exchanger 9. The refrigerant circulation circuit 1 is a pipe through which the refrigerant circulates. In the present embodiment, chlorofluorocarbon is used as the refrigerant.

  The trochoid pump 2 is an electric trochoid pump provided in the refrigerant circulation circuit 1 and circulates the refrigerant in the refrigerant circulation circuit 1. The trochoid pump 2 includes an oil separator 2a and a pipe 2b in addition to the respective parts 20 to 25 described later. The oil separator 2 a is a device that separates oil from the refrigerant flowing through the refrigerant circulation circuit 1. A pipe (corresponding to an “oil supply unit”) 2 b is a flow path forming member that supplies oil that has flowed out from the oil separator 2 a to the trochoid pump 2. Details of the trochoid pump 2 will be described later.

  The first heat exchanger 3 is a heat exchanger that exchanges heat between the first fluid that is a liquid supplied from an external heat source and the refrigerant that flows through the refrigerant circulation circuit 1. The first heat exchanger 3 is provided in the refrigerant circulation circuit 1. The first fluid flows through the first heating circuit 30. In the present embodiment, the first fluid is engine coolant (not shown), and the first heating circuit 30 is the engine coolant circuit. The temperature of the cooling water (first fluid) flowing into the first heat exchanger 3 is approximately 80 to 90 ° C. in the summer and approximately 65 to 70 ° C. in the winter. The first heating circuit 30 mainly includes a pipe 31, a pump 32 that causes the first fluid to flow through the pipe 31, a radiator 33, a flow path that passes through the first heat exchanger 3, and a flow path that passes through the radiator 33. And a three-way valve 34 and an engine jacket 35.

  The oil circulation circuit 4 is a flow path through which oil (oil fluid) circulates. Specifically, the oil circulation circuit 4 includes a pipe 41, a pump 42, and a tank 43. The pipe 41 is a flow path forming member through which oil fluid circulates. The pump 42 is an electric pump that circulates oil fluid through the pipe 41. The tank 43 is a container connected to the pipe 41 and supplies an oil fluid to the pipe 41. Oil is a working fluid that has a specific heat higher than that of a refrigerant and is a liquid at the operating temperature. The oil fluid may be tempura oil, for example.

  The second heat exchanger 5 is a heat exchanger that exchanges heat between the second fluid and the oil fluid flowing through the oil circulation circuit 4. The second fluid is a gas supplied from an external heat source and having a higher temperature than the first fluid. The second fluid flows through the second heating circuit 50. In the present embodiment, the second fluid is engine exhaust gas, and the second heating circuit 50 is an engine exhaust passage (exhaust pipe). The temperature of the exhaust gas (second fluid) flowing into the second heat exchanger 5 is approximately 130 to 150 ° C. in the summer and approximately 80 to 90 ° C. in the winter.

  The third heat exchanger 6 is a heat exchanger that exchanges heat between the oil flowing through the oil circulation circuit 4 and the refrigerant that has passed through the first heat exchanger 3. The third heat exchanger 6 is provided in the refrigerant circulation circuit 1 and is located behind the first heat exchanger 3 in the refrigerant flow direction. The third heat exchanger 6 exchanges heat between the liquid refrigerant and the liquid oil fluid to evaporate the refrigerant.

  The expander 7 is a device that generates rotational power by flowing in the refrigerant evaporated through the third heat exchanger 6. The expander 7 is provided in the refrigerant circulation circuit 1 and is located behind the third heat exchanger 6 in the refrigerant flow direction. The expander 7 expands the refrigerant that has become vapor, and converts the expansion force into rotational power. The expander 7 flows out the refrigerant whose temperature has decreased due to expansion.

  The expander 7 of this embodiment is a scroll expander. The scroll expander is well known and will be described briefly. As shown in FIG. 2, the expander 7 mainly includes a housing 70, a fixed scroll 71, a turning scroll 72, and a shaft 73. The fixed scroll 71 includes a bottom plate 711 and a fixed side wrap 712 that is formed in a spiral shape and is erected on the surface of the bottom plate 711. The fixed scroll 71 is fixed to the housing 70.

  The orbiting scroll 72 has a bottom plate 721 whose surface is arranged to face the surface of the bottom plate 711, and an orbiting side wrap 722 that is formed in a spiral shape and is erected on the surface of the bottom plate 721. The expansion chamber 7 a is defined by the fixed scroll 71 and the orbiting scroll 72.

  The shaft 73 includes a first shaft portion 731 having one end connected to the drive shaft 81 of the generator 8, a disc-shaped crank portion 732 having the other end of the first shaft portion 731 fixed to the surface, and one end crank portion. And a second shaft portion 733 that is eccentrically fixed to the rear surface of the first shaft portion 731. The other end of the second shaft portion 733 is supported on the back surface of the bottom plate 721 of the orbiting scroll 72 so as to be able to rotate. The axis of the first shaft portion 731 coincides with the rotation center (rotation axis) of the orbiting scroll 72.

  The vapor refrigerant flows into the expansion chamber 7a through the through hole 71a provided in the central portion of the fixed scroll 71 and expands. As the refrigerant expands, the expansion chamber 7 a expands, and the orbiting scroll 72 rotates relative to the fixed scroll 71. When the turning scroll 72 turns, the shaft 73 rotates. That is, the expander 7 generates rotational power. The rotational power rotates the drive shaft 81 of the generator 8 connected to the shaft 73 to drive the generator 8. The temperature of the refrigerant expanded in the expansion chamber 7 a decreases, and flows out of the expander 7 through the discharge passage 71 b provided in the outer periphery of the fixed scroll 71.

  The generator 8 is a device that generates power using the rotational power generated by the expander 7. As shown in FIG. 2, the generator 8 includes a housing 80, a drive shaft 81, a cylindrical stator 82 disposed in the housing 80, and a rotor 83 fixed to the drive shaft 81 and disposed opposite to the stator 82. And. The drive shaft 81 is disposed on the inner peripheral side of the stator 82. In the generator 8, when the drive shaft 81 rotates, the rotor 83 rotates with respect to the stator 82 to generate power.

  The shaft 73 may be linear without the crank portion 732. In this case, when the shaft 73 and the drive shaft 81 are linearly connected, the axis of the drive shaft 81 is eccentric with respect to the rotation center (rotation axis) of the drive shaft 81. Also by this, the generator 8 generates power by the rotation of the drive shaft 81. Further, the shaft 73 may be configured such that a crank portion is located at a connection portion with the drive shaft 81.

  The fourth heat exchanger (corresponding to a “condenser”) 9 exchanges heat between the refrigerant flowing through the refrigerant circulation circuit 1 between the expander 7 and the trochoid pump 2 and the third fluid flowing through the cooling circuit 90. Heat exchanger. The third fluid of this embodiment is cooling water (here, tap water). The cooling circuit 90 includes a pipe 91 through which cooling water flows, a pump 92 provided in the pipe 91, and a tank 93 provided in the pipe 91 and storing the cooling water. The fourth heat exchanger 9 exchanges heat between the refrigerant and the cooling water to cool and condense the refrigerant.

  When the refrigerant in the refrigerant circuit 1 flows out from the outlet of the trochoid pump 2, the oil separator 2a, the first heat exchanger 3, the third heat exchanger 6, the expander 7, and the fourth heat exchanger are sequentially arranged in the flow direction. 9 is passed through to the inlet of the trochoid pump 2.

(About Trochoid Pump 2)
Here, the detailed configuration of the trochoid pump 2 will be described. The trochoid pump 2 is a trochoid pump as shown in FIGS. 3 to 5, and includes a casing 20, an outer rotor 21, an inner rotor 22, a suction port 23, a discharge port 24, and an oil supply port 25. It is equipped with.

  The casing 20 is a bottomed cylindrical container that forms a cylindrical space 20a inside. The outer rotor 21 is a cylindrical member accommodated in the casing 20, and is rotatably disposed in the cylindrical space 20a. The outer peripheral surface of the outer rotor 21 is in contact with the inner peripheral surface of the casing 20 and is slidable with respect to the casing 20. The outer rotor 21 has a plurality of internal teeth 21a.

  The inner rotor 22 is rotatably disposed on the inner peripheral side of the outer rotor 21. The inner rotor 22 has a plurality of external teeth 22 a that engage with the internal teeth 21 a of the outer rotor 21. The inner rotor 22 is driven by a rotating shaft 201 that is supported by the casing 20. The rotation center of the inner rotor 22 is eccentric with respect to the rotation center of the outer rotor 21. A plurality of pump chambers A are formed between the outer rotor 21 and the inner rotor 22. The pump chamber A repeats expansion (volume increase) and compression (volume decrease) by rotating the rotors 21 and 22.

  The suction port 23 is an arc-shaped through hole formed in an end surface (end surface in the axial direction) portion of the casing 20. In other words, the casing 20 has a through-hole forming portion 20b that forms the suction port 23 at the end surface portion. In the present embodiment, the suction port 23 also constitutes a piping member (23 in FIG. 5) that allows the refrigerant circulation circuit 1 and the cylindrical space 20a to communicate with each other.

  The discharge port 24 is an arc-shaped through hole formed in the end surface portion of the casing 20. In other words, the casing 20 has a through-hole forming portion 20c that forms the discharge port 24 at the end surface portion. In the present embodiment, the discharge port 24 also constitutes a piping member (24 in FIG. 5) that allows the refrigerant circulation circuit 1 and the cylindrical space 20a to communicate with each other.

  Like the general trochoid pump, the trochoid pump 2 discharges the fluid sucked from the suction port 23 into the cylindrical space 20a from the discharge port 24 by the volume change of the pump chamber A accompanying the rotation of the rotors 21 and 22. Assuming that one pump chamber A rotates as the rotors 21 and 22 rotate, the pump chamber A expands its volume when moving along the suction port 23 and sucks fluid. After reaching the maximum, the fluid is discharged by reducing the volume when moving along the discharge port 24. The drive source of the rotating shaft 201 is an electric motor.

  The oil supply port 25 is a flow path that supplies oil from the outside of the casing 20 to an internal space formed by the inner peripheral surface of the outer rotor 21. The internal space is composed of a plurality of pump chambers A. The oil supply port 25 includes a first oil passage 251 and a plurality of second oil passages 252.

  The first oil flow path 251 is a flow path that communicates the piping 2b through which oil is discharged and the clearance D formed by the inner peripheral surface of the casing 20 and the outer peripheral surface of the outer rotor 21. The first oil flow path 251 of the present embodiment is a through hole formed in a side surface portion of the casing 20 to communicate the outer peripheral side and the inner peripheral side of the casing 20. In other words, the casing 20 has a through-hole forming portion 20d that forms the first oil passage 251 in the side surface portion.

  The second oil flow path 252 is a flow path formed in the outer rotor 21 to communicate the outer peripheral side and the inner peripheral side of the outer rotor 21. Specifically, the second oil passage 252 is a through-hole penetrating from the outer peripheral surface to the inner peripheral surface of the outer rotor 21. In other words, the outer rotor 21 has a through-hole forming portion 21 b that forms the second oil flow path 252. The second oil passage 252 extends linearly in the radial direction of the outer rotor 21. A plurality of second oil passages 252 are provided with respect to the outer rotor 21 at intervals in the circumferential direction.

  The oil separator 2 a is installed in the refrigerant circulation circuit 1 between the trochoid pump 2 and the first heat exchanger 3. The oil separator 2a is a general one, and separates and removes oil from the refrigerant flowing through the refrigerant circuit 1, and causes the oil to flow out to the pipe 2b. That is, the oil separator 2a includes a storage part B that stores oil and a feed mechanism C that sends out the oil in the storage part to the pipe 2b. When the trochoid pump 2 operates, the oil separator 2a supplies oil to the pipe 2b.

  The pipe 2 b is a flow path forming member that connects the oil separator 2 a and the oil supply port 25. The oil that flows out from the oil separator 2a flows into the oil supply port 25 through the pipe 2b. The oil is directly supplied to the inner peripheral surface of the outer rotor 21, that is, the contact surface between the outer rotor 21 and the inner rotor 22 through the pipe 2 b, the first oil passage 251, and the second oil passage 252. Note that the oil supplied by the oil separator 2a and the pipe 2b is oil that functions as lubricating oil, unlike the oil fluid that flows through the oil circulation circuit 4. Oil has a certain degree of viscosity.

  The oil flows out from the oil separator 2a to the pipe 2b, and has a certain high pressure in a state where the first oil passage 251 and the second oil passage 252 are not connected. The oil flows out into the outer rotor 21 when the flow paths 251 and 252 are connected by the rotation of the outer rotor 21.

  The oil is also supplied to the clearance D from between the first oil passage 251 and the second oil passage 252. The oil separator 2a may be installed between the outlet of the trochoid pump 2 and the inlet of the expander 7. However, from the viewpoint of excluding the oil from the heat exchange target and eliminating the extra heat exchange, the oil separator 2a may It is preferable to install between one heat exchanger 3 entrance.

  According to the power generator, the refrigerant is heated by exchanging heat with the first fluid (engine cooling water) in the first heat exchanger 3 and further heated by exchanging heat with the oil fluid in the third heat exchanger 6. The The oil fluid is a liquid oil with a high specific heat, stores the thermal energy of the second fluid (exhaust gas), which is a gas with low energy density, and makes the refrigerant uniform in the third heat exchanger 6 as high-density thermal energy. Heat to. Thereby, local boiling of the refrigerant is suppressed, and heat transfer from the second fluid to the refrigerant is facilitated.

  Furthermore, evaporation of the refrigerant is promoted as a whole by primary heating by the first heat exchanger 3 and heat exchange (secondary heating) with the second fluid storing high-density heat energy. As a result, even when the low-temperature exhaust heat is used, the refrigerant can be more uniformly evaporated and the gaseous refrigerant can be introduced into the expander 7 more reliably. Thereby, the fall of the work rate (enthalpy at the time of expansion) of the refrigerant | coolant by the expander 7 can be suppressed, and the electric power generation output of the generator 8 can be maintained.

  In addition, since the power generation device includes the oil circulation circuit 4, it is not necessary to make the second fluid of gas such as exhaust gas high in pressure, and the second fluid can be used at atmospheric pressure, and excessive power consumption is suppressed. You can also.

  Further, considering that the power generation device can be used even with low-temperature exhaust heat, downsizing at the same time as maintaining the power generation output is an issue from the viewpoint of effective use of space and portability. According to the power generator, since the expander 7 is a scroll expander, it is possible to reduce the size as compared with other types such as a screw type. Since the power generator is a power generator that can reliably introduce the vapor refrigerant by the expander 7 even when using low-temperature exhaust heat, it can maintain the generated power even in the scroll expander and can be downsized. It becomes.

  In addition, many liquid pumps for circulating a refrigerant (liquid) other than oil, such as a diaphragm type, are not so durable and costly. In addition, when a screw type expander is used when the refrigerant cannot be converted to steam with high accuracy, the flow rate of the refrigerant needs to be increased, so that the liquid pump becomes large and expensive.

  The trochoid pump is generally developed as an oil pump whose target is oil. In order to allow fluids other than oil to flow through the trochoid pump, the tip clearance (the clearance between the rotors 21 and 22) and the side clearance (clearance D) of the trochoid pump must be reduced so that the pressure can be increased. However, if the clearance is reduced, the lubricity is deteriorated and the durability is lowered. Thus, the trochoid pump has no wear resistance against liquid refrigerants other than oil, is unsuitable for the circulation of liquid refrigerants other than oil, and is difficult to put into practical use. That is, it has been difficult to reduce the size of the power generation device by reducing the size of the pump.

  However, the trochoid pump 2 of the present embodiment has an oil supply port 25, and oil is directly supplied from the oil separator 2 a to the inner peripheral surface of the outer rotor 21. That is, according to the present embodiment, the oil film can be formed at least locally on the inner peripheral surface of the outer rotor 21, that is, on the contact surface between the outer rotor 21 and the inner rotor 22. Thereby, the abrasion resistance and durability of the trochoid pump 2 can be improved also with respect to the distribution | circulation of fluids other than oil. Moreover, it becomes possible to suppress the leakage of the refrigerant at high pressure by forming the oil film.

  Thus, according to the trochoid pump 2 of the present embodiment, even when a fluid (for example, a refrigerant) other than oil is circulated, the pump can be operated at a high pressure. That is, according to this embodiment, fluid other than oil can be circulated. Accordingly, the trochoid pump 2 can be used as a pump for circulating the refrigerant, and the pump in the apparatus (power generation apparatus) can be downsized, and thus the apparatus can be downsized.

  In the present embodiment, since the inlet of the second oil passage 251 is formed on the outer peripheral surface of the outer rotor 25, oil can be supplied to the sliding surface between the outer rotor 25 and the casing 20, The durability of the trochoid pump 2 can be improved. Further, since the second oil passage 251 is a straight through hole, the trochoid pump 2 can be easily manufactured. Further, since the plurality of second oil flow paths 251 are provided, a wide range of oil film can be formed by the inner peripheral surface of the outer rotor 25.

  Moreover, since the oil separator 2a is located in front of the expander 7 in the refrigerant flow direction, a decrease in expansion efficiency due to the oil contained in the refrigerant is suppressed. Furthermore, in this embodiment, since the oil separator 2a is located in front of the first heat exchanger 3 in the refrigerant flow direction, it is possible to suppress heat loss due to heating of the oil in the refrigerant. it can. Further, since the oil separated by the oil separator 2a is directly returned to the trochoid pump, the oil can be used efficiently.

<Other variations>
The present invention is not limited to the above embodiment. The first oil channel 251 may be a channel in which an inlet is provided on the outer surface other than the inner peripheral surface of the casing 20 and an outlet is provided in the inner peripheral surface of the casing 20. The second oil flow path 252 may be a flow path in which an inlet is provided on an outer surface other than the inner peripheral surface of the outer rotor 21 and an outlet is provided in the inner peripheral surface of the outer rotor 21. In addition, the inlet of the oil supply port 25 may be open to any one of the outer surfaces excluding the inner peripheral surface of the outer rotor 21, that is, one end surface, the other end surface, and the outer peripheral surface of the outer rotor 21.

  Further, a machine groove for spraying oil into the outer rotor 21 (pump chamber A) may be provided. Further, the oil separator 2 a may be formed integrally with the casing 20. The oil separator 2a may be provided in the discharge port 24. The exhaust heat source may be engine exhaust heat or exhaust heat in the factory. If it is an engine, for example, an engine of a vehicle such as a truck or a gas engine of a gas heat pump air conditioner can be used as an exhaust heat source of the power generator. Since the power generation device of this embodiment can be reduced in size, it can also be mounted on a vehicle. The refrigerant circuit 1 is appropriately provided with a valve, a thermometer, a flow meter, or the like. The drive source of the rotating shaft 201 may be an engine. The trochoid pump 2 can be used in a circuit for circulating a fluid other than oil in addition to the power generation device.

1: refrigerant circulation circuit, 2: trochoid pump,
20: casing, 21: outer rotor,
22: Inner rotor, 23: Suction port, 24: Discharge port,
25: Oil supply port, 251: First oil passage, 252: Second oil passage,
2a: oil separator, 2b: piping (oil supply part),
3: first heat exchanger, 4: oil circulation circuit, 5: second heat exchanger,
6: Third heat exchanger, 7: Expander, 70: Housing, 71: Fixed scroll,
72: Orbiting scroll 73: Shaft 8: Generator
9: Fourth heat exchanger (condenser), A: Pump room, D: Clearance

Claims (6)

A casing forming a cylindrical space;
An outer rotor rotatably disposed in the cylindrical space and having internal teeth;
An inner rotor that has outer teeth that engage with the inner teeth, is rotatably arranged in the outer rotor, and forms a plurality of pump chambers that repeat expansion and compression with the outer rotor;
A suction port and a discharge port communicating with the cylindrical space;
An oil supply port communicating with the internal space formed by the inner peripheral surface of the outer rotor;
An oil supply section for supplying oil to the oil supply port;
An oil separator for separating oil from the fluid discharged from the discharge port;
Trochoid pump equipped with. In claim 1,
The oil supply port is a trochoid pump in which an inlet is formed in the casing and an outlet is formed in an inner peripheral surface of the outer rotor. In claim 1 or 2,
The oil supply port is
A first oil flow path provided in the casing and communicating with a clearance formed on an inner peripheral surface of the casing and an outer peripheral surface of the outer rotor, and the oil supply unit;
A second oil passage provided in the outer rotor and communicating the clearance and the internal space;
Trochoid pump equipped with. In claim 3,
The trochoid pump, wherein the second oil passage is a through-hole penetrating the outer rotor from an outer peripheral surface to an inner peripheral surface. In claim 3 or 4,
The trochoid pump in which a plurality of the second oil passages are provided at intervals in the circumferential direction of the outer rotor. In any one of Claims 1-5,
The oil separator is a trochoid pump that causes the separated oil to flow out to the oil supply unit.

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