JP2012246902A - Pump system and binary electrical generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an oil from being leaked from a binary electrical generator where the pump system is provided in the circulating route of a working medium and its pump system.SOLUTION: The pump system 4 that is provided halfway in a closed loop circulation flow route where the working medium is circulated and allows the working medium to be circulated including a housing 4c that has an opened pump side housing section 4c1 and an opened motor side housing section 4c2 and is coupled with an internal cave 4d that lies astride both housing sections by matching the periphery of an opening 16a with that of an opening 17a, a pump body 4a that is provided inside the opened pump side housing section 4c1 and has a drive gear 18 and a driven gear 19 that become engaged with one another, a motor 4b provided inside the opened motor side housing section 4c2, an axis that is provided in the internal cave 4d, one end of which constitutes the axis 18b of the drive gear 18, the other end thereof constitutes an axis 24a around which the motor 4b rotates, and a heater 14 that is provided on the opened motor side housing section 4c2, and heats the working medium inside the opened motor side housing section 4c2, is provided.

Description

  The present invention relates to a binary power generation device including a pump device in a circulation passage of a working medium and the pump device.

  In recent years, from the viewpoint of energy saving, there is an increasing need for a power generation system that recovers so-called “waste heat” discharged from various facilities such as factories and uses the energy of the recovered “waste heat”.

  As such a power generation system, for example, as described in Patent Document 1, an evaporator that evaporates the working medium, an expander that causes the working medium vapor to perform expansion work, and the working medium vapor are condensed. Binary power generation configured to circulate the working medium in a closed loop in which a condenser for circulating the working medium and a pump device for circulating the working medium are connected in series to form a heat cycle, and to drive the generator with an expander The system is known.

  In such a binary power generation system, in order to circulate the working medium in the closed loop, it is necessary to provide a pump device in the closed loop, and various types of pump devices can be applied to the pump device. Is preferred.

  As the gear pump, one shown in FIGS. 5 and 6 is known (see, for example, Patent Document 2). In this gear pump, a pair of side plates 112 are fitted into opposing portions of the cavity inside the housing 101 to define a gear chamber 114, and a pair of gears 103 and 104 that mesh with each other are accommodated in the gear chamber 114, and The shafts 130, 140 of the gears 103, 104 are fitted and supported by support holes 131, 141 formed in the corresponding side plates 112, and the meshing positions of both gears 103, 104 are inside the gear chamber 114. A suction chamber 105 and a discharge chamber 106 for the working medium are formed with a gap therebetween. Further, the shaft 130 of the drive gear 103 needs to extend to the outside from the through hole 150 formed in the housing 101 in order to transmit the rotational driving force by the motor disposed outside the housing 101. An oil seal 117 that closes the gap with the shaft 130 is provided at 150, and the oil seal 117 is configured to prevent oil from leaking between the housing 101 and the shaft 130.

Japanese Patent Laid-Open No. 10-103030 JP-A-10-141246

  However, when the oil seal 117 is used, when the pressure inside the housing 101 is almost equal to the atmospheric pressure, the sealing function can be sufficiently exerted, but when the pressure inside the housing 101 is higher than the atmospheric pressure, for example, 0. When the pressure is higher than 02 Mpa, there is a risk that the function of the seal may be lost due to wear after long-term operation. In particular, when a mechanical seal is used as the oil seal 117, if the oil is contaminated with dust, dust may enter the seal portion and oil leakage may occur.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a pump device that can prevent oil leakage and a binary power generation device including the pump device.

  The pump device of the present invention is a pump device that is provided in the middle of a closed-loop circulation path through which a working medium flows, and circulates the working medium, and includes a pump-side housing portion and a motor-side housing portion that are both open. A pump main body having a housing connected to each other with an inner cavity straddling both housing parts by butting the peripheral edges of the openings, and a drive gear and a driven gear which are provided inside the pump-side housing part and mesh with each other A motor provided inside the motor-side housing portion, a shaft provided in the internal cavity, one end portion constituting the shaft portion of the drive gear, and the other end portion constituting the shaft portion of the motor, It is provided with the said motor side housing part, The heating means which heats the working medium inside the motor side housing part is comprised, It is characterized by the above-mentioned.

  The binary power generator of the present invention includes an evaporator that evaporates a liquid working medium, an expander that causes the working medium vapor generated by the evaporator to perform expansion work, and a condenser that condenses the working medium vapor. A circulating device in which the evaporator, the expander, the condenser, and the pump device are connected in series in this order, and a generator that is driven by the expander to generate power. In the binary power generator, the pump device includes a pump-side housing portion and a motor-side housing portion that are both open, and a housing that is connected in a state of having an inner cavity straddling both housing portions by abutting the peripheral portions of the openings. A pump body having a drive gear and a driven gear which are provided inside the pump side housing portion and mesh with each other, and the motor side housing portion An internal motor, an internal cavity provided in the internal cavity, one end constituting the shaft of the drive gear, the other end constituting the shaft rotating the motor, and the motor side housing And heating means for heating the working medium inside the motor-side housing part.

  In the case of the pump device and the binary power generator, the pump body and the motor are both provided in the housing, and the shaft of the drive gear and the shaft of the motor rotate are connected. It is not necessary to provide a through hole in the housing for passing the shaft of the drive gear from the outside of the housing, and oil leakage can be reliably prevented. In addition, it is possible to eliminate the inconvenience caused when both the pump body and the motor are provided in the housing. In other words, if the working medium around the motor is in a cooled and condensed liquid state before starting the motor, the load due to the stirring of the liquid is large even if trying to start in that state, there is a possibility that it can not be started, By heating the working medium inside the motor housing by the heating means, the working medium in the vicinity of the motor evaporates into a gaseous state, thereby reducing the load caused by stirring and starting the motor. .

  In this configuration, the motor-side housing part is provided with an introduction port and an outlet port, and an outlet port of the introduction channel branched from the circulation channel is connected to the inlet port, and the outlet port is connected with the above-described outlet port. An inlet of the outlet channel for returning the working medium inside the motor side housing part to the circulation channel is connected, and the pressure at the connection portion of the inlet of the inlet channel in the circulation channel is connected to the outlet of the outlet channel You may make it be larger than the pressure of a part. As a result, the working medium flowing through the circulation channel is introduced from the inlet to the inside of the motor-side housing portion through the introduction channel, and the flow of the working medium from the outlet to the circulation channel through the outlet channel is caused. The liquid working medium that has been formed and has not evaporated by the heating means can be sent out of the housing by the above flow. As a result, the stagnation of the working medium in the vicinity of the motor is reduced, the load on the motor is reduced, and the starting of the motor is further facilitated.

  In the configuration of the binary power generation device, the inlet of the introduction channel may be between the evaporator and the expander in the circulation channel. In this case, since the gaseous working medium that has passed through the evaporator is sent to the introduction flow path, the ratio of the working medium gas inside the motor increases, and the reduction of the starting load of the motor becomes even more remarkable. .

  In the configuration of the binary power generation device, the inlet of the introduction channel may be between the pump device and the evaporator in the circulation channel. Thereby, since the low-temperature working medium which came out of the pump apparatus is supplied to the pump apparatus again, abnormal heating of the working medium by the heating means provided in the pump apparatus can be avoided.

  In the configuration of the binary power generation device, the motor is operated by the heating means in a state in which the on-off valve provided in at least one of the introduction flow path and the discharge flow path is closed and the on-off valve is closed when the motor is started. And a control means for heating the working medium inside the side housing portion and performing control for opening the closed on-off valve and stopping heating by the heating means after a predetermined time has elapsed since the start of the motor. It may be. In this configuration, the circulating flow path before start-up is in a pressure equalized state, so that the working medium does not easily flow inside the motor even when the on-off valve is opened. Therefore, before starting the motor, the on-off valve is closed so that the working medium does not flow inside the motor, the working medium is heated and evaporated by the heating means, and then the motor is started. After a predetermined time has elapsed, a closed on-off valve is opened to generate a flow in the working medium inside the motor based on the pressure difference between the inlet of the inlet channel and the outlet of the outlet channel. The working medium staying in is discharged. Therefore, when the normal operation is performed thereafter, the flow of the working medium is generated inside the motor, so that the heating by the heating means can be stopped. By stopping the heating of the heating means, unnecessary power consumption can be eliminated.

  In the configuration of the binary power generation device, the drive gear and the driven gear in the pump main body each have a shaft and a bearing portion that receives each shaft, and the pump-side housing portion is supplied to each bearing portion. An oil drain passage for discharging the lubricated oil to the motor-side housing portion may be provided. In this configuration, the lubricating oil supplied to the bearing portion on the pump body side is discharged to the motor-side housing portion through the oil drainage passage, and the lubricating oil is discharged from the outlet port provided in the motor-side housing portion. It is led out of the housing together with the working medium. Therefore, a separate line for discharging the lubricating oil out of the housing is not required.

  In the case of the pump device of the present invention and the binary power generation device of the present invention, the pump body and the motor are both provided in the housing, and the shaft of the drive gear and the rotation shaft of the motor are connected. Thus, it is not necessary to provide a through hole in the housing for passing the shaft of the drive gear from outside the housing, and oil leakage can be reliably prevented. In addition, it is possible to eliminate the inconvenience caused when both the pump body and the motor are provided in the housing. In other words, if the working medium around the motor is in a cooled and condensed liquid state before starting the motor, the load resistance due to the stirring of the liquid is large even if trying to start in that state, and there is a possibility that it cannot be started. By heating the working medium inside the motor side housing part by the heating means, the working medium near the motor evaporates into a gaseous state, and the motor can be started.

1 is a block diagram illustrating a binary power generator according to a first embodiment of the present invention. It is a longitudinal cross-sectional view which shows the pump apparatus which concerns on this invention. It is a block diagram which shows the binary electric power generating apparatus which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the binary electric power generating apparatus which concerns on 3rd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the conventional pump apparatus. FIG. 6 is a right side view of FIG. 5.

  Hereinafter, embodiments of the present invention will be described.

(First embodiment)
FIG. 1 is a block diagram showing a configuration of a binary power generator according to a first embodiment of the present invention, and FIG. 2 is a longitudinal sectional view showing a pump device used in the binary power generator.

  The binary power generation device 50 includes a closed loop circulation channel 6 that circulates a working medium. The circulation channel 6 includes an evaporator 5, an expander 1, an oil separator 7, a condenser 3, and the like. The pump device 4 is connected in series in this order. As the working medium, for example, a low-boiling organic medium (such as Freon) having a lower boiling point than water such as R245fa can be used.

  The evaporator 5 is for evaporating the working medium (liquid) flowing through the circulation flow path 6. For example, the warming water heated by exhaust heat or the like flowing through the flow path 35 separate from the circulation flow path 6, The working medium is configured to be heated. That is, the evaporator 5 has a flow path through which the working medium flows and a flow path through which the hot water flows, and exchanges heat between the hot water and the working medium.

  The expander 1 is arranged on the downstream side of the evaporator 5 in the circulation flow path 6, and extracts the kinetic energy from the working medium by expanding the working medium (vapor) evaporated in the evaporator 5. As the expander 1, a screw type expander is used in the present embodiment. A generator 2 is connected to the drive shaft of the screw expander 1, and power can be generated by the generator 2 as the drive shaft rotates.

  In this screw type expander 1, oil is used to improve the seal between the screw rotors, and the oil is mixed into the working medium, so that the screw type expander 1 and the condenser 3 in the circulation channel 6 An oil separator 7 is provided therebetween, and oil mixed in the working medium is separated and recovered by the oil separator 7. And the oil flow path 8 which connects the bottom part of the oil separator 7 and the expansion space (namely, space in which the said screw rotor is accommodated) of the screw type expander 1 is provided, and this oil flow path 8 is in the middle. The oil recovered by the oil separator 7 is returned to the expansion space of the screw expander 1 through the oil flow path 8 by the provided oil pump 9. The expander 1 can be constituted by, for example, a rotary expander, a scroll expander, a turbo expander, a turbine, or the like instead of the screw expander.

  The condenser 3 is disposed on the downstream side of the oil separator 7 in the circulation channel 6, and condenses the working medium (steam) expanded (depressurized) by the expander 1. For example, the condenser 3 cools and condenses the working medium with cooling water flowing through a flow path (cooling water flow path) 36 of a system different from the circulation flow path 6. That is, the condenser 3 has a flow path through which the cooling water flows and a flow path through which the working medium flows, and exchanges heat between the cooling water and the working medium.

  The pump device 4 is arranged on the downstream side of the condenser 3 in the circulation flow path 6, pressurizes the working medium condensed in the condenser 3 into a liquid state to a predetermined pressure, and sends it to the evaporator 5. Thus, the working medium is circulated in the circulation flow path 6. The pump device 4 has a configuration in which a pump body 4a and a motor 4b are provided in a common housing 4c, which will be described in detail below.

  FIG. 2 is a longitudinal sectional view showing the configuration of the pump device 4.

  The housing 4c has a pump side housing part 4c1 and a motor side housing part 4c2. The pump-side housing portion 4c1 has a configuration in which the end surface of the cylindrical casing 16 is connected to the peripheral edge of the opening 15a of the bottomed cylindrical casing 15, and is formed into a bottomed cylindrical shape as a whole. An opening 16a is provided on the side housing part 4c2 side (right side in FIG. 2). The motor side housing part 4c2 is composed of one bottomed cylindrical casing 17, and has an opening 17a on the pump side housing part 4c1 side (left side in FIG. 2).

  The housing 4c is configured by connecting a pump-side housing portion 4c1 and a motor-side housing portion 4c2 in a state where the peripheral edge portion of the opening 16a and the peripheral edge portion of the opening 17a are in contact with each other. A cavity 4d straddling the housing portions 4c1 and 4c2 is formed.

  A pump body 4a having a driving gear 18 and a driven gear 19 that mesh with each other is provided inside the cavity 4d and inside the pump-side housing portion 4c1. The pump body 4a includes a pump chamber 4g that accommodates both gears 18 and 19, a suction port 4e provided on one side across the meshing portion of both gears 18 and 19, and a discharge port 4f provided on the other side. (See FIG. 1), both gears 18 and 19 are rotated to move the working medium sucked from the suction port 4e along the inner surface of the pump chamber 4g and discharged from the discharge port 4f. A part of the working medium accumulates in the cavity 4d.

  The shaft 18 a of the drive gear 18 is rotatably supported by bearings 20 and 21, and the shaft 18 b of the drive gear 18 is also rotatably supported by a bearing 22. Further, the shaft 19 a of the driven gear 19 is rotatably supported by the bearings 25 and 26, and the shaft 19 b of the driven gear 19 is also rotatably supported by the bearing 27. The bearing 20 and the bearing 25 are ball bearings, and the bearing 21, the bearing 22, the bearing 26, and the bearing 27 are roller bearings.

  The drive gear 18 and the driven gear 19 are located inside the casing 16 and on the abutting side with the casing 15. The bearings 20 and 21 and the bearings 25 and 26 are provided in the casing 15, and the bearing 22 and the bearing 27. Is received by the casing 16. The shaft 18b of the drive gear 18 supported by the bearing 22 passes through the bearing 22 and extends toward the motor side housing portion 4c2.

  A motor 4b is provided inside the cavity 4d and inside the motor-side housing portion 4c2. The motor 4b includes a stator 23 that is fixed to the inner peripheral surface of the motor-side housing portion 4c2, and a rotor 24 that is disposed on the inner side of the stator 23, and a shaft (rotating shaft) of the rotor 24. The shaft 18b of the drive gear 18 is connected to 24a. In the illustrated example, the shaft 24a of the rotor 24 and the shaft 18b of the drive gear 18 are connected separately. However, the present invention is not limited to this, and the shaft 18b is formed at one end of the integral one. The shaft 24a may be configured on the other end side.

  The casing 15 is provided with an oil supply hole 28 that communicates with the bearings 20, 21, 25, and 26 from the outside, and the casing 16 is provided with an oil supply hole 29 that communicates with the bearings 22 and 27 from the outside. Further, an oil drain hole 30 is provided as a drain oil passage from the casing 15 to the casing 16, and the outlet end of the oil drain hole 30 is inside the cavity 4d and between the pump body 4a and the motor 4b. It is open. The lubricating oil supplied from the oil supply holes 28 and 29 is sent from the oil discharge hole 30 into the motor-side housing portion 4c2 through the bearing 20 and the like.

  An introduction port 11 is provided in the upper part of the motor side housing part 4c2, and a lead-out port 13 is provided in the lower part of the motor side housing part 4c2. As shown in FIG. 1, an inlet 10 a is provided at a portion of the circulation channel 6 between the evaporator 5 and the expander 1, that is, a portion where the working medium is evaporated by the evaporator 5 to a high pressure. The outlet 10b of the introduction flow path 10 connected in communication is connected, and the working medium having passed through the evaporator 5 is supplied to the inside of the motor side housing portion 4c2 via the introduction flow path 10. The outlet 13 is connected to an inlet 12a of the outlet passage 12 in which an outlet 12b is connected in communication between the screw expander 1 and the oil separator 7 in the circulation passage 6, and the outlet 12b in the motor-side housing portion 4c2. The working medium and the oil sent from the oil drain hole 30 are supplied to the oil separator 7 through the outlet channel 12. The outlet 12b of the outlet channel 12 is replaced with the expansion of the screw expander 1 instead of between the screw expander 1 and the oil separator 7 in the circulation channel 6, as indicated by a broken line in FIG. You may make it connect to the intermediate | middle (reduced pressure part) of the entrance and exit in space.

  Further, as shown in FIG. 2, a heater 14 as a heating means is provided outside the motor-side housing portion 4c2, and the motor-side housing portion 4c2 is heated by the heater 14, and the motor-side housing portion 4c2 The motor 4b and the working medium in the vicinity thereof are heated. As the heater 14, various types of heating means can be used, such as a system that converts electricity into heat, and a pipe in which a warm liquid is passed around the outside of the motor-side housing portion 4c2. It is done. Further, the heating means need not be provided outside the motor-side housing part 4c2, but may be provided in the meat part of the motor-side housing part 4c2 or in the cavity 4d inside the motor-side housing part 4c2.

  In the binary power generation device 50 according to the first embodiment configured as described above, the pump device 4 is provided with both the pump body 4a and the motor 4b in the housing 4c, and the shaft of the drive gear 18 is provided. 18b and the shaft (rotary shaft) of the rotor 24 are connected to each other, so that a through-hole for passing the shaft 18b of the drive gear 18 from the outside of the housing 4c to the housing 4c is unnecessary as in the prior art. Oil leakage can be surely prevented. Further, it is possible to eliminate the inconvenience caused when both the pump body 4a and the motor 4b are provided in the housing 4c. That is, since the pressure of the working medium discharged from the pump body 4a is transmitted to the entire area in the cavity 4d, if the working medium around the motor 4b is cooled and condensed before starting the motor, it will start in that state. However, the load due to the stirring of the liquid is large and it may not be possible to start, but by heating the working medium inside the motor side housing part 4c2 by the heater 14, the working medium near the motor 4b evaporates. As a result, the load caused by stirring is reduced, and the motor 4b can be started.

  Further, in the case of the first embodiment, the pump device 4 has the introduction port 11 and the discharge port 13 in the motor-side housing part 4c2, and the introduction port 11 branches from the circulation flow path 6 and the branch. An outlet 10b of the introduction channel 10 having an inlet 10a at a point is connected, and an inlet 12a of the outlet channel 12 for returning the working medium inside the motor side housing part 4c2 to the circulation channel 6 is connected to the outlet port 13. Therefore, the working medium flowing through the circulation flow path 6 is introduced into the motor side housing portion 4c2 from the introduction port 11 through the introduction flow path 10, and the working medium is introduced from the lead-out port 13 near the motor 4b through the lead-out flow path 12. Thus, a flow returned to the circulation flow path 6 is formed, and the liquid working medium that has not evaporated by the heater 14 can be sent out of the housing 4c by the flow. Thereby, the retention of the working medium in the vicinity of the motor 4b is reduced, and the load on the motor 4b is reduced. Therefore, the start-up of the motor 4b is further facilitated.

  Furthermore, in the case of this first embodiment, since the inlet 10a of the introduction flow path 10 branched from the circulation flow path 6 is a portion between the evaporator 5 and the expander 1, the introduction flow path 10 includes Since the gaseous working medium passing through the evaporator 5 is sent, the gas ratio of the working medium in the motor side housing part 4c2 increases, and the start-up load of the motor 4b is further reduced.

  Furthermore, in the case of the first embodiment, even if the lubricating oil supplied from the oil supply holes 28 and 29 is sent from the oil discharge hole 30 into the motor side housing portion 4c2 through the bearing 20 or the like, the motor side housing Since the working medium and oil mixed in the portion 4c2 are supplied to the oil separator 7 via the outlet 13 and separated there, there is no need to separately provide a line for feeding the lubricating oil to the housing 4c. Therefore, the structure of the pump device 4 and the structure of the binary power generation device 50 can be simplified.

(Second Embodiment)
FIG. 3 is a block diagram showing a configuration of the binary power generator 51 according to the second embodiment of the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals.

  In this binary power generation device 51, the inlet 31 a is connected between the pump device 4 and the evaporator 5 in the circulation channel 6 instead of the introduction channel 10, and the outlet 31 b is connected to the introduction port 11. Only the point which uses the introduction flow path 31 differs from 1st Embodiment.

  In the case of the binary power generation device 51, a part of the low-temperature (liquid) working medium that has come out of the pump device 4 is returned to the pump device 4 through the introduction flow path 31, and thus the heater 14 provided in the pump device 4. This makes it possible to avoid abnormal heating of the working medium. Other configurations and operational effects are the same as those of the first embodiment.

(Third embodiment)
FIG. 4 is a block diagram showing a configuration of the binary power generation apparatus 52 according to the third embodiment of the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals.

  In this binary power generation device 52, the first opening / closing valve 32 is provided in the introduction passage 10, and the second opening / closing valve 33 is provided in the outlet passage 12. The opening / closing valves 32, 33 are controlled by the control device 34. It becomes the composition which is done. The control device 34 also controls the heating of the heater 14.

  When the motor 4b is started, the control device 34 heats the working medium inside the motor side housing portion 4c2 by the heater 14 with the first on-off valve 32 and the second on-off valve 33 closed, and the motor 4b After a predetermined time has elapsed since the start, both the first on-off valve 32 and the second on-off valve 33 are opened and heating by the heater 14 is stopped.

  In the case of the third embodiment, the following effects can be obtained. That is, since the circulation flow path 6 before starting the motor 4b is in a pressure-equalized state, even if both the first on-off valve 32 and the second on-off valve 33 are opened, the working medium in the motor 4b It is difficult for flow to occur. Therefore, before starting the motor 4b, the first on-off valve 32 and the second on-off valve 33 are closed to prevent the working medium from flowing inside the motor 4b, and the working medium is heated by the heater 14 to evaporate. Let Thereafter, the motor 4b is started and, after a predetermined time has elapsed since the start of the motor 4b, both the first on-off valve 32 and the second on-off valve 33 are opened, whereby the inlet 10a and the outlet passage of the introduction passage 10 are opened. A flow is generated in the working medium inside the motor 4b based on the pressure difference with the 12 outlets 12b, and the working medium staying inside the motor 4b is discharged by this flow. Therefore, when the normal operation is performed thereafter, the flow of the working medium is generated in the motor 4b, so that the heating by the heater 14 can be stopped. By stopping the heating of the heater 14, unnecessary power consumption can be eliminated.

  In the third embodiment, before the motor 4b is started, the first on-off valve 32 and the second on-off valve 33 are closed so that the working medium does not flow inside the motor 4b. However, the present invention is not limited to this. Only one of the first on-off valve 32 and the second on-off valve 33 may be closed so that the working medium does not flow inside the motor 4 b and heated by the heater 14. Even if it does in this way, the same effect is acquired. In addition, an opening / closing valve is provided on one of the introduction channel 10 and the outlet channel 12 so that the opening / closing valve is closed before the motor 4b is activated, and the closed opening / closing valve is opened after a predetermined time has elapsed since the activation of the motor 4b. In this case, the same effect can be obtained.

DESCRIPTION OF SYMBOLS 1 Expander 2 Generator 3 Condenser 4 Pump apparatus 4a Pump main body 4b Motor 4c Housing 4c1 Pump side housing part 4c2 Motor side housing part 4d Cavity 5 Evaporator 6 Circulating flow path 10 Introducing flow path 11 Inlet port 12 Deriving flow path 13 Outlet 14 Heater (heating means)
18 drive gear 18b shaft (drive shaft)
19 Driven gear 30 Oil drain hole (oil drain passage)
31 Introductory flow path 32 1st on-off valve 33 2nd on-off valve 34 Controller 50, 51, 52 Binary power generator

Claims (7)

A pump device that is provided in the middle of a closed-loop circulation path through which the working medium flows, and circulates the working medium,
A housing that has a pump-side housing portion and a motor-side housing portion that are both open, and is connected in a state of having an internal cavity straddling both housing portions by abutting the peripheral edge portions of the openings;
A pump body provided inside the pump-side housing portion and having a driving gear and a driven gear meshing with each other;
A motor provided in the motor side housing part;
A shaft that is provided in the internal cavity, one end of which forms the shaft of the drive gear, and the other end of which forms the shaft of the motor;
A pump apparatus comprising: a heating unit provided in the motor side housing part, for heating a working medium inside the motor side housing part. An evaporator that evaporates the liquid working medium; an expander that causes the working medium vapor generated in the evaporator to perform expansion work; a condenser that condenses the working medium vapor; and a pump device that circulates the working medium. In the binary power generation device having a circulation flow path in which the evaporator, the expander, the condenser, and the pump device are connected in series in this order, and a generator that is driven by the expander and generates power,
The pump device is
A housing that has a pump-side housing portion and a motor-side housing portion that are both open, and is connected in a state of having an internal cavity straddling both housing portions by abutting the peripheral edge portions of the openings;
A pump body provided inside the pump-side housing portion and having a driving gear and a driven gear meshing with each other;
A motor provided in the motor side housing part;
A shaft that is provided in the internal cavity, one end of which constitutes the shaft of the drive gear, and the other end of which constitutes a shaft that rotates the motor;
A binary power generator, comprising: a heating unit provided in the motor side housing part and heating a working medium inside the motor side housing part.   The motor-side housing part is provided with an introduction port and a lead-out port, and an outlet of the introduction channel branched from the circulation channel is connected to the introduction port, and the motor-side housing unit is connected to the lead-out port. Is connected to the inlet of the outlet flow path for returning the working medium to the circulation flow path, and the pressure at the inlet connection portion of the introduction flow path in the circulation flow path is higher than the pressure of the outlet connection portion of the outlet flow path. The binary power generator according to claim 2, wherein   The binary power generator according to claim 3, wherein an inlet of the introduction channel is between the evaporator and the expander in the circulation channel.   The binary power generator according to claim 3, wherein the inlet of the introduction channel is between the pump device and the evaporator in the circulation channel. An on-off valve provided in at least one of the introduction channel and the outlet channel;
When starting the motor, the working medium inside the motor housing is heated by the heating means with the open / close valve closed, and the closed open / close valve is opened after a predetermined time has elapsed since the start of the motor. The binary power generator according to claim 3, further comprising a control unit that opens and controls to stop heating by the heating unit.   The drive gear and the driven gear in the pump main body each have a shaft and a bearing portion that receives the shaft, and the pump-side housing portion receives lubricating oil supplied to the bearing portion on the motor side. The binary power generator according to any one of claims 2 to 6, further comprising an oil discharge passage for discharging to the housing portion.

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