JP6018814B2 - Cooling equipment integrated pump device - Google Patents

Description

  The present invention relates to a cooling device-integrated pump device, and more particularly to a cooling device-integrated pump device used to cool a heating element such as an electric motor or an inverter of an electric vehicle or a hybrid vehicle with a liquid refrigerant of an air conditioner.

  In electric vehicles and hybrid vehicles, it is necessary to cool heating elements such as motors and inverters. Therefore, it is conceivable to cool the heating element by circulating cooling water between the heating element and a radiator, as in a vehicle having a normal engine. However, when cooling water is used, it is necessary to newly install a radiator for cooling the heating element, so that the vehicle mountability is poor.

  Further, for example, in the invention described in Patent Document 1, the heating element is cooled using an air conditioner (vapor compression refrigeration cycle) without newly providing a radiator. However, in the present invention, there is a problem that power consumption for driving the compressor increases and the travelable distance of the electric vehicle is shortened. Further, when the air conditioner is not used, the heating element cannot be cooled.

  Therefore, in the heating element cooling device described in Patent Document 2, a bypass is provided between the receiver tank and the evaporator, a pump is disposed in the bypass, and heat exchange is performed between the liquid refrigerant and the heating element. While suppressing an increase in mechanical work for cooling the heating element, the heating element can be cooled even when the air conditioner is not used.

JP-A-5-344606 Japanese Patent No. 3591304

  However, in the heating element cooling device described in Patent Document 2, a bypass is provided between the receiver tank and the evaporator, and a pump is disposed in the bypass, so that the number of parts increases and parts are installed. There is a problem that the space of the vehicle increases, leading to an increase in the size of the vehicle, and the difficulty of fitting out.

  Therefore, the present invention has been made in view of the above-described problems in the prior art, and has a compact design that suppresses an increase in the number of parts when cooling a heating element such as an electric motor of an electric vehicle or a hybrid vehicle. An object of the present invention is to provide a cooling device-integrated pump device which can be easily equipped.

In order to achieve the above object, the present invention provides a cooling device integrated pump device comprising a cooling device constituting a refrigeration cycle and a pump formed integrally with the cooling device and circulating liquid refrigerant in the refrigeration cycle. The pump is formed in a housing of the pump and has a gear housing chamber having a bottom portion, a suction port and a discharge port opened at an upper portion of the gear housing chamber, and internal teeth, and an inner wall of the gear housing chamber An outer gear that is slidably in contact with the outer gear, and an outer gear that has outer teeth that mesh with the inner teeth of the outer gear, and whose rotation axis is eccentric from the rotation axis of the outer gear; And a motor housing that rotates the outer gear, and a housing of a cooling device that is integrally formed with the pump forms a part of a wall surface of the gear housing chamber .

  According to the present invention, the cooling device housing formed integrally with the pump is configured to form a part of the pump housing, so the increase in the number of parts can be suppressed, a compact design is possible, and the fitting is easy. It becomes.

  In addition, the suction port or the discharge port can be formed in a casing of a cooling device that forms a part of the wall surface of the gear housing chamber.

  Further, between the inner wall surface of the gear housing chamber and the outer gear, liquid refrigerant communicating with the discharge port and interposed between the outer gear and the inner gear is led out from the side surface of the pump device to the outside. A lead-out path or an introduction path communicating with the suction port and introducing liquid refrigerant between the outer gear and the inner gear from the side surface of the pump device can be formed.

  The gear housing chamber may include a plurality of columnar portions that rotatably support the outer gear. By forming a gap between adjacent columnar bodies of a plurality of columnar portions, it is possible to reduce friction torque due to fluid shear stress acting between the outer gear and the gear housing chamber, and it is difficult for dust and slime to collect between them. Become.

  In the cooling device-integrated pump device, the shaft of the inner gear is provided at the bottom of the housing of the cooling device formed integrally with the pump, and the hole provided in the central axis direction of the inner gear is the shaft. It can be configured to be inserted in a freely rotatable manner.

  The tooth surfaces of the outer gear and the inner gear can have a cycloid tooth profile, and by using the cycloid tooth profile, the discharge capacity can be increased as compared with the case of using an involute tooth profile.

  In addition, the outer gear and the drive shaft of the motor can be magnetically coupled, the performance and type of the motor can be changed, or only the motor can be replaced when the motor breaks down. Maintenance management can be performed easily.

  Furthermore, the cooling device formed integrally with the pump can be a receiver tank that separates the refrigerant into gas and liquid and extracts the liquid refrigerant, or a three-way valve that switches the refrigerant flow path.

  In addition, the refrigeration cycle is used in a vehicle air conditioning system, can cool a heating element of the vehicle with the liquid refrigerant, and can provide a cooling device-integrated pump device with good vehicle mountability.

  As described above, according to the present invention, when cooling a heating element such as an electric motor of an electric vehicle or a hybrid vehicle, an increase in the number of components is suppressed, a compact design is possible, and a cooling device integrated type that can be easily equipped A pump device can be provided.

It is a whole lineblock diagram showing the refrigerating cycle system provided with the cooling equipment integrated pump device concerning the present invention. It is a figure which shows the cooling device integrated pump apparatus which concerns on this invention, Comprising: (a) is a front view, (b) is a right view, (c) is a bottom view of (b). It is the sectional view on the AA line of Fig.2 (a). It is the BB sectional view taken on the line of FIG.2 (b). It is a figure for demonstrating the joining method of the cooling device housing | casing and pump housing in the cooling device integrated pump apparatus which concerns on this invention, Comprising: (a) shows the case by welding joining, (b) shows the case by bolt joining.

  Next, modes for carrying out the present invention will be described with reference to the drawings. In the following description, a case where the cooling device integrated pump device according to the present invention is used in a vehicle air conditioning system and a vehicle heating element is cooled by liquid refrigerant will be described as an example.

  FIG. 1 shows a refrigeration cycle system provided with a cooling device integrated pump device (hereinafter referred to as “pump device”) according to the present invention. The system 101 includes a compressor 102, a condenser 103, and an expansion valve 104. And the evaporator 105 and the pump device 1 according to the present invention, and the pump device 1 is used to cool a heating element 107 such as an electric motor or an inverter of an electric vehicle or a hybrid vehicle.

  The compressor 102, the condenser 103, the expansion valve 104, and the evaporator 105 are connected by a pipe 109, and the refrigerant circulates between them. Further, the liquid refrigerant flows through the bypass pipe 110 that connects the pipe 109 between the condenser 103 and the expansion valve 104 and the pipe 109 between the compressor 102 and the condenser 103.

  The pump device 1 includes a pump 2 and a receiver tank 3. The receiver tank 3 is a liquid tank that stores the refrigerant, or a receiver dryer that stores the refrigerant and removes moisture in the refrigerant. The pump 2 introduces the liquid refrigerant from the receiver tank 3 into the heating element 107 to cool the heating element 107.

  The pump 2 is an internal gear pump, and as shown in FIGS. 2 to 4, a main body (pump housing) 4 having a gear housing chamber 4a, an outer gear 6 and an inner gear 5 housed in the gear housing chamber 4a. And a motor 8 that rotates the outer gear 6 via a magnetic coupling 7.

  The main body 4 is formed in a cylindrical shape, and the outer gear 6 and the inner gear 5 are accommodated in the internal gear accommodating chamber 4 a, and the upper opening is closed at the lower end portion of the receiver tank housing 10. In the gear housing chamber 4a, a refrigerant suction port 4c and a discharge port 4d provided in the bottom surface portion 10c are opened, and the inner wall surface of the gear housing chamber 4a and the outer gear 6 communicate with the discharge port 4d. In addition, a lead-out path 4h for leading the refrigerant interposed between the outer gear 6 and the inner gear 5 from the side surface of the pump 2 to the outside is formed. The discharge port 4d communicates with the refrigerant outlet 4e through the outlet path 4h.

  The gear housing chamber 4a of the main body 4 is provided with a plurality of (four in the present embodiment) columnar portions 4f that rotatably support the outer gear 6, and a gap 4g is formed between the adjacent columnar portions 4f. Is done. By providing the gap 4g, the facing portions of the outer gear 6 and the gear housing chamber 4a are divided, and the area of each facing portion is reduced (that is, the gear housing of the outer gear 6 is provided by the amount of the clearance 4g. The area of the portion facing the chamber 4a is reduced), and the friction torque due to fluid shear stress can be reduced. Further, dust and slime are less likely to accumulate between the outer gear 6 and the gear housing chamber 4f.

  The main body 4 and the receiver tank housing 10 may be joined by welding (welded portion 19) as shown in FIG. 5 (a), and joined using bolts 21 as shown in FIG. 5 (b). May be. When the bolt 21 is used, the mounting position of the lower bolt 15 (described later) is lowered in consideration of the ease of joining work.

  The receiver tank housing 10 located above the main body 4 includes a bottom surface portion 10c at the lower part thereof. The bottom surface portion 10c includes a suction port 4c that opens to the gear housing chamber 4a side and a refrigerant inlet 10a that opens to the receiver tank housing 10 side. The suction port 4c and the refrigerant inlet 10a communicate with each other. Further, a recess is formed in the lower portion of the bottom surface portion 10c so that the discharge port 4d is opened on the gear housing chamber 4a side. Reference numeral 10b denotes a wall surface of the recess.

  The inner gear 5 and the outer gear 6 are inscribed gears whose tooth shapes are formed by a cycloid curve. Since the central axes of the gears 5 and 6 are eccentric, the relative rotation of the gears 5 and 6 causes the gap G generated between the gears 5 and 6 in the gear housing chamber 4a to repeat expansion and contraction.

  Here, if the outer gear 6 is rotated in the direction of the arrow R, the suction port 4c opens to the expansion region between the relatively rotating inner gear 5 and outer gear 6, while the discharge port 4d. Is opened in the contraction region, the refrigerant in the receiver tank housing 10 is sucked between the gears 5 and 6 through the refrigerant inlet 10a and the suction port 4c by the relative rotation of both the gears 5 and 6. The refrigerant is discharged from the refrigerant outlet 4e through the discharge port 4d and the outlet passage 4h. In addition, the tooth profile of the inner gear 5 and the outer gear 6 can also be formed by an involute curve.

Inner gear 5 has external teeth that mesh engagement with the internal teeth of the outer gear 6, the rotational axis is provided so as to eccentrically from the axis of rotation of the outer gear 6. The hole formed in the center of the inner gear 5 is rotatably inserted into a protruding portion 10e protruding from the lower surface of the receiver tank housing 10 toward the gear accommodating chamber 4a. In addition, the protrusion part which protrudes upwards from the partition 4b may be provided, and the hole of the center of the inner gear 5 may be inserted in this protrusion part. In this case, an appropriate hole is formed in the bottom of the outer gear 6 so as to penetrate the above-described protrusion.

  On the other hand, the outer gear 6 has inner teeth, is provided with a magnet 6b on the bottom surface of the bottomed cylindrical main body 6a, constitutes a magnetic coupling 7 together with the magnet 8b on the motor 8 side, and slides on the inner wall of the gear housing chamber 4a. It rotates in the gear housing chamber 4a while contacting.

  The motor 8 is mounted on the motor fixing plate 13 via an appropriate means such as a bolt. In this state, the motor cover 12, the motor fixing plate 13 and the main body 4 are fastened by the bolt 15. A magnet 8 b is mounted on the drive shaft 8 a of the motor 8, and the magnet 6 b and the magnet 8 b are opposed to each other with the partition wall 4 b of the main body 4 interposed therebetween, thereby constituting a magnetic coupling 7 that connects the outer gear 6 and the motor 8. . The drive unit configured by the motor 8 and the drive shaft 8a is configured to be detachable from the main body 4 while maintaining the sealed state of the gear housing chamber 4a. A connector 17 for supplying power to the motor 8 is attached to the lower surface of the motor cover 12.

  When the motor 8 rotates, the pump 2 of the pump device 1 having the above configuration rotates while the outer gear 6 meshes with the inner gear 5 via the magnetic coupling 7.

  As the inner gear 5 and the outer gear 6 are meshed with each other, the volume of the gap G between the gears 5 and 6 in the gear housing chamber 4a changes, and the liquid refrigerant stored in the receiver tank housing 10 is stored in the receiver tank housing 10. After being sucked into the gear housing chamber 4a through the refrigerant inlet 10a and the suction port 4c of the body 10, it flows to the refrigerant outlet 4e through the gear housing chamber 4a, the discharge port 4d and the outlet path 4h. The liquid refrigerant discharged from the refrigerant outlet 4e is supplied to the heating element 107 in FIG.

  As described above, according to the present embodiment, the pump 2 and the receiver tank 3 are integrated, and the receiver tank housing 10 is a part of the main body 4 of the pump 2, thereby suppressing an increase in the number of components and compact. Design becomes possible, and the outfitting becomes easy.

  Further, since the motor 8 is detachably provided in the gear housing chamber 4a outside the gear housing chamber 4a of the main body 4, the electrical characteristics such as insulation are changed in relation to the motor 8 depending on the type of liquid refrigerant or mixed oil. Even if it is necessary to change the performance of the pump device 1 or the type of the motor 8 in accordance with customer specifications, the design can be easily changed. Even if the motor 8 fails, it is sufficient to replace only the motor 8, so that maintenance management of the pump device 1 is facilitated.

In the above description, the pump 2 is provided in the lower part of the receiver tank housing 10, and the refrigerant in the receiver tank housing 10 is sucked into the pump 2 from the bottom surface portion 10c. The refrigerant can be sucked into the pump 2 from the bottom side surface of the receiver tank housing 10 provided on the lower side surface of the housing 10.
In that case, first, the refrigerant inlet 10a shown in FIG. 3 is provided on the lower side surface of the housing 10, and the inlet 4c is communicated between the inner wall surface of the gear housing chamber 4a and the outer gear 6, and the outer gear. An introduction path for sucking in the refrigerant interposed between the inner gear 5 and the inner gear 5 from the side surface of the pump 2 may be formed in the same manner as the above-described outlet path 4h, and this introduction path may be communicated with the refrigerant inlet.

  In the above embodiment, the case where the cooling device formed integrally with the pump 2 is a receiver tank is exemplified. However, a three-way valve for switching the refrigerant flow path is formed integrally with the pump 2 or the like to switch between cooling and heating. You can also That is, any cooling device constituting the refrigeration cycle may be integrated with the pump as long as it can be directly connected to the refrigerant inlet or the refrigerant outlet of the pump that circulates the liquid refrigerant in the refrigeration cycle.

1 Pump device 2 Pump 3 Receiver tank (cooling equipment)
4 Main body 4a Gear housing chamber 4b Partition wall 4c Suction port 4d Discharge port 4e Refrigerant outlet 4f Columnar body 4g Clearance 4h Lead-out path 5 Inner gear 6 Outer gear 6a Main body 6b Magnet 7 Magnetic coupling 8 Motor 8a Drive shaft 8b Magnet 10 Receiver tank housing Body 10a Refrigerant inlet 10b Wall surface 10c Bottom surface portion 10e Projection portion 12 Motor cover 13 Motor fixing plate 15 Bolt 17 Connector 19 Welding portion 21 Bolt 101 Refrigeration cycle system 102 Compressor 103 Condenser 104 Expansion valve 105 Evaporator 107 Heating element 109 Piping 110 Bypass pipe

Claims (9)

In a cooling device integrated pump device comprising: a cooling device constituting a refrigeration cycle; and a pump that is integrally formed with the cooling device and circulates a liquid refrigerant in the refrigeration cycle.
The pump is
A gear housing chamber formed in the housing of the pump and having a bottom;
A suction port and a discharge port that open at the top of the gear housing chamber;
An outer gear having inner teeth and arranged to slide in contact with the inner wall of the gear housing chamber,
An outer gear having outer teeth meshing with the inner teeth of the outer gear, and an inner gear provided such that its rotational axis is eccentric from the rotational axis of the outer gear;
A motor for rotating the outer gear,
The cooling device-integrated pump device, wherein a casing of the cooling device formed integrally with the pump forms a part of a wall surface of the gear housing chamber . The cooling device-integrated pump device according to claim 1 , wherein the suction port or the discharge port is formed in a housing of a cooling device forming a part of a wall surface of the gear housing chamber. A lead-out path between the inner wall surface of the gear housing chamber and the outer gear, through which the liquid refrigerant is communicated with the discharge port and interposed between the outer gear and the inner gear. or cooling device according to claim 1 or 2, characterized in that introduction path for introducing the liquid refrigerant between the outer gear and the inner gear from the side of the inlet and communicating with the pump device is formed Integrated pump device. The gear accommodating chamber, cooling equipment integrated pump apparatus according to claim 1, 2 or 3, characterized in that it comprises a plurality of columnar portion supporting the outer gear rotatably. The shaft of the inner gear is provided at the bottom of the housing of the cooling device formed integrally with the pump,
The cooling device-integrated pump device according to any one of claims 1 to 4 , wherein a hole provided in the central axis direction of the inner gear is rotatably inserted into the shaft. The cooling device-integrated pump device according to any one of claims 1 to 5 , wherein tooth surfaces of the outer gear and the inner gear have a cycloid tooth profile. The cooling device-integrated pump device according to any one of claims 1 to 6 , wherein the outer gear and the drive shaft of the motor are magnetically coupled. Cooling device to be formed integrally with the pump, one of the claims 1 to 7, characterized in that a three-way valve for switching the receiver tank, or the flow path of the refrigerant to extract the liquid refrigerant by gas-liquid separation of the refrigerant The cooling device integrated pump device according to claim 1. The cooling device-integrated pump device according to any one of claims 1 to 8 , wherein the refrigeration cycle is used in an air conditioning system for a vehicle and cools a heating element of the vehicle by the liquid refrigerant.

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