JP2013253576A - Liquid refrigerant circulation pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid refrigerant circulation pump easily designed and facilitating maintenance management.SOLUTION: A liquid refrigerant circulation pump 1 circulating liquid refrigerant in a refrigeration cycle comprises: pump bodies 2, 8 having a cylindrical gear housing chamber 2a having a bottom part and suction and discharge ports 8c, 8d opening to the gear housing chamber; an outer gear 4 having inner teeth, in slide contact with an inner wall of the gear housing chamber, and rotatably arranged; an inner gear 3 having outer teeth meshed with the inner teeth of the outer gear and having a rotational axial line eccentric from a rotation axial line of the outer gear; a motor 6 rotating the outer gear to discharge the liquid refrigerant from the suction port to the discharge port; and a magnetic coupling 5 connecting the outer gear and a drive shaft 6a of the motor. The motor is detachably provided to the pump body.

Description

  The present invention relates to a liquid refrigerant circulation pump, and more particularly to a liquid refrigerant circulation pump used to cool a heating element such as an electric motor or an inverter of an electric vehicle or a hybrid vehicle with 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 and the evaporator, a pump is disposed in the bypass, and heat is exchanged between the liquid refrigerant and the heating element, thereby generating heat. While suppressing an increase in mechanical work for cooling the body, 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 above conventional liquid refrigerant circulation pump, the electrical characteristics such as insulation properties are changed depending on the type of liquid refrigerant or mixed oil, or the pump performance and the type of motor as the drive unit according to customer specifications There is a problem that the design and maintenance management of the pump becomes complicated, such that it is necessary to change the pump, or it is necessary to replace the entire pump when the motor breaks down.

  Accordingly, the present invention has been made in view of the problems in the above-described conventional liquid refrigerant circulation pump, and an object thereof is to provide a liquid refrigerant circulation pump that is easy to design and maintain.

  In order to achieve the above object, the present invention is a pump for circulating a liquid refrigerant in a refrigeration cycle, comprising a cylindrical gear housing chamber having a bottom, and an intake port and a discharge port that open to the gear housing chamber. A pump body having internal teeth, an outer gear that is slidably contacted with an inner wall of the gear housing chamber, and an outer tooth that meshes with the inner teeth of the outer gear. An inner gear provided such that its axis is eccentric from the rotation axis of the outer gear, a motor that discharges liquid refrigerant from the suction port to the discharge port by rotating the outer gear, the outer gear, and the motor And a magnetic coupling for connecting the drive shaft, wherein the motor is detachably provided on the pump body.

  And according to the present invention, when the outer gear and the drive shaft of the motor are connected by the magnetic coupling and the motor is detachably provided on the pump body, the performance or type of the motor is changed or the motor breaks down It is possible to replace only the motor, and it is possible to easily design and maintain the pump.

  In the pump, the pump body includes a cover disposed at an upper portion of the gear housing chamber, and the cover communicates with the suction port and the refrigerant inlet communicating with the suction port, the discharge port and the discharge port. And a refrigerant outlet.

  Further, in the above pump, the refrigerant inlet can be opened on one of the upper surface or the side surface of the cover, and the refrigerant outlet can be opened on the other of the upper surface or the side surface of the cover. The size of the upper surface of the cover can be reduced.

  Furthermore, the center shaft of the inner gear can be provided in the cover, and the hole provided in the rotation axis direction of the inner gear can be inserted into the center shaft provided in the cover.

  The central axis of the inner gear may be provided at the bottom of the gear accommodating chamber, and the inner gear may be inserted into the central axis provided at the bottom of the gear accommodating chamber with a hole provided in the rotational axis direction thereof. .

  In the pump, the motor can be attached to a motor fixing plate, and can be attached to the pump body via the motor fixing plate.

  Further, the magnetic coupling can be configured to perform magnetic coupling in a direction parallel to the rotation axis of the outer gear, thereby reducing the size of the pump perpendicular to the rotation axis of the outer gear. be able to.

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

  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 pump with good vehicle mountability.

  As described above, according to the present invention, it is possible to provide a liquid refrigerant circulation pump that is easy to design and maintain.

It is a whole lineblock diagram showing the refrigerating cycle system provided with the liquid refrigerant circulation pump concerning the present invention. It is a figure which shows the pump for liquid refrigerant circulation which concerns on this invention, Comprising: (a) is a front view, (b) is a side view, (c) is a bottom view, (d) is the sectional view on the AA line of (b). The figure and (e) are CC sectional view taken on the line of (b). FIG. 3 is a cross-sectional perspective view taken along line BB in FIG. It is sectional drawing for demonstrating the motor attachment structure of the liquid refrigerant circulation pump of FIG. It is sectional drawing for demonstrating the other example of the motor attachment structure of the liquid refrigerant circulation pump which concerns on this invention. It is a figure for demonstrating the further another example of the motor attachment structure of the pump for liquid refrigerant circulation which concerns on this invention, (a) is sectional drawing, (b) is a perspective view.

  Next, modes for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 shows a refrigeration cycle system provided with a liquid refrigerant circulation pump (hereinafter referred to as “pump”) according to the present invention. This system 101 includes a compressor 102, a condenser 103, an expansion valve 104, An evaporator 105 and the pump 1 according to the present invention are provided, and the pump 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 1 is an inscribed gear pump, and as shown in FIGS. 2 to 4, a main body 2 having a cylindrical gear housing chamber 2 a having a bottom portion, an internal tooth and a sliding contact with the gear housing chamber 2 a. A bottomed cylindrical outer gear 4 that is rotatably accommodated, an inner gear 3 that has external teeth that mesh with the outer gear 4 and that has a rotational axis that is eccentric from the rotational axis of the outer gear 4, and the outer gear 4. Motor 6 that rotates through a magnetic coupling 5 that performs magnetic coupling in a direction parallel to the rotation axis of the gear 4, and a cover 8 that is disposed above the main body 2 and covers the gear housing chamber 2a. . The main body 2 and the cover 8 constitute a pump main body.

  The main body 2 is formed in a cylindrical shape, and the outer gear 4 and the inner gear 3 are accommodated in the internal gear accommodating chamber 2 a, and the upper opening is closed by the cover 8. An O-ring 13 is attached to the upper surface of the main body 2 and the lower surface of the cover 8, and the main body 2 and the cover 8 are coupled by a bolt 14.

  The cover 8 positioned above the main body 2 is provided with a suction port 8c, a refrigerant inlet 8a communicating with the suction port 8c, a discharge port 8d, and a refrigerant outlet 8b communicating with the discharge port 8d. These communicate with the gear housing chamber 2 a of the main body 2. The refrigerant inlet 8a is connected to the pipe 109 side in FIG. 1, the refrigerant outlet 8b is connected to the heating element 107 side, and the cover 8 is fixed to a bracket or the like.

  In this example, the refrigerant inlet 8a is opened on the upper surface of the cover 8, and the refrigerant outlet 8b is opened on the side surface of the cover 8. However, the refrigerant inlet 8a is opened on the side surface of the cover 8, and the refrigerant outlet 8b is opened on the upper surface of the cover 8. Further, both the refrigerant inlet 8a and the refrigerant outlet 8b may be provided on the upper surface of the cover 8 or on the side surfaces.

  The inner gear 3 and the outer gear 4 are inscribed gears whose tooth shapes are formed by a cycloid curve. Since the central axes of the gears 3 and 4 are eccentric, the relative rotation of the gears 3 and 4 causes the gap G generated between the two gears 3 and 4 in the gear housing chamber 2a to repeatedly expand and contract.

  Here, if the outer gear 4 is rotated in the direction of the arrow R, the suction port 8c opens to the expansion region between the inner gear 3 and the outer gear 4 that rotate relatively, while the discharge port 8d Since it opens to the contraction region, the refrigerant is sucked between the gears 3 and 4 through the refrigerant inlet 8a and the suction port 8c by the relative rotation of both the gears 3 and 4, and the sucked refrigerant is discharged into the discharge port 8d and It is discharged from the refrigerant outlet 8b. In addition, the tooth profile of the inner gear 3 and the outer gear 4 can also be formed by an involute curve.

  A hole formed in the center of the inner gear 3 is rotatably inserted into a protruding portion 8e protruding from the lower surface of the cover 8 toward the gear housing chamber 2a. In addition, the protrusion part which protrudes upwards from the partition 2b may be provided, and the hole of the center of the inner gear 3 may be inserted in this protrusion part. In this case, an appropriate hole is formed in the bottom portion of the outer gear 4 so as to penetrate the above-described protruding portion.

  On the other hand, the outer gear 4 includes a magnet 4 b on the bottom surface of the bottomed cylindrical main body 4 a, constitutes a magnetic coupling 5 together with the magnet 6 b on the motor 6 side, and protrudes downward from the lower surface of the outer gear 4. Slidably contacts the partition wall 2b of the main body 2 and rotates in the gear housing chamber 2a.

  The motor 6 is attached to the motor fixing plate 11 via bolts 16. A magnet 6 b is attached to the drive shaft 6 a of the motor 6, and the motor cover 10, the motor fixing plate 11 and the main body 2 are fastened by bolts 17 in this state.

  As a result, the magnet 6b and the magnet 4b face each other with the partition wall 2b of the main body 2 interposed therebetween, and the magnetic coupling 5 that connects the outer gear 4 and the motor 6 is configured. The drive part comprised by the motor 6 and the drive shaft 6a is comprised so that attachment or detachment to the main body 2 is maintained, maintaining the sealing state of the gear storage chamber 2a. A connector 18 for supplying power to the motor 6 is attached to the lower surface of the motor cover 10.

  When the motor 6 rotates, the pump 1 having the above configuration rotates around the protruding portion 4 c while the outer gear 4 meshes with the inner gear 3 via the magnetic coupling 5. By meshing the inner gear 3 and the outer gear 4, the volume of the gap between the gears 3, 4 in the gear housing chamber 2 a changes, and the gear of the main body 2 passes through the refrigerant inlet 8 a and the suction port 8 c of the cover 8. The liquid refrigerant sucked into the storage chamber 2a flows to the refrigerant outlet 8b through the gear storage chamber 2a and the discharge port 8d. The liquid refrigerant discharged from the refrigerant outlet 8b is supplied to the heating element 107 in FIG.

  As described above, according to the present embodiment, since the motor 6 is detachably provided in the gear housing chamber 2a outside the gear housing chamber 2a of the main body 2, the relationship with the motor 6 depends on the type of liquid refrigerant or mixed oil. Therefore, even if it is necessary to change electrical characteristics such as insulation or to change the performance of the pump 1 or the type of the motor 6 in accordance with customer specifications, the design can be easily changed. Further, even if the motor 6 breaks down, it is sufficient to replace only the motor 6, so that maintenance management of the pump 1 is facilitated.

  Next, another example of the mounting structure of the motor 6 in the pump 1 will be described with reference to FIGS.

  In the mounting structure shown in FIG. 5, the motor 6 and the motor fixing plate 11 are coupled by a bolt 16, and the main body 2 and the motor cover 10 are screwed into the motor cover 10 and a female screw 10 a screwed into the motor cover 10. The male screw 2c thus formed is coupled by screwing. Thus, the motor 6 is configured to be detachable from the main body 2 while maintaining the sealed state of the gear housing chamber 2a.

  In the mounting structure shown in FIG. 6, the motor 6 and the motor fixing plate 11 are coupled by a bolt 16, and the main body 2 and the motor cover 10 are press-fitted into the grooves 2 d and 10 b formed in both of them. Combined. Thus, the motor 6 is configured to be detachable from the main body 2 while maintaining the sealed state of the gear housing chamber 2a.

DESCRIPTION OF SYMBOLS 1 Pump 2 Main body 2a Gear accommodation chamber 2b Partition 2c Male screw 2d Groove part 3 Inner gear 4 Outer gear 4a Main body 4b Magnet 4c Projection part 5 Magnetic coupling 6 Motor 6a Drive shaft 6b Magnet 8 Cover 8a Refrigerant inlet 8b Refrigerant outlet 8c Inlet
8d Discharge port 8e Protruding part 10 Motor cover 10a Female thread 10b Groove part 11 Motor fixing plate 13 O-rings 14, 16, 17 Bolt 18 Connector 19 Pin 101 Refrigeration cycle system 102 Compressor 103 Condenser 104 Expansion valve 105 Evaporator 107 Heating element 109 Piping 110 Bypass pipe

Claims (9)

A pump for circulating liquid refrigerant in the refrigeration cycle,
A cylindrical gear housing chamber having a bottom, and a pump body having a suction port and a discharge port that open to 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 external 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 that discharges liquid refrigerant from the suction port to the discharge port by rotating the outer gear;
A magnetic coupling for connecting the outer gear and the drive shaft of the motor;
A pump for circulating a liquid refrigerant, wherein the motor is detachably attached to the pump body. The pump body includes a cover disposed at an upper portion of the gear housing chamber,
2. The liquid refrigerant circulation pump according to claim 1, wherein the cover includes the suction port, a refrigerant inlet communicating with the suction port, and a refrigerant outlet communicating with the discharge port and the discharge port. . The refrigerant inlet opens on one of the upper surface or the side surface of the cover,
3. The liquid refrigerant circulation pump according to claim 2, wherein the refrigerant outlet opens on the other of the upper surface and the side surface of the cover. A central axis of the inner gear is provided on the cover;
4. The liquid refrigerant circulation pump according to claim 2, wherein a hole provided in the rotation axis direction of the inner gear is inserted into a central axis provided in the cover. A central axis of the inner gear is provided at the bottom of the gear housing chamber;
4. The liquid refrigerant circulation pump according to claim 2, wherein a hole provided in the rotation axis direction of the inner gear is inserted into a central shaft provided at the bottom of the gear housing chamber.   6. The liquid refrigerant circulation pump according to claim 1, wherein the motor is attached to a motor fixing plate, and is attached to the pump body through the motor fixing plate.   7. The liquid refrigerant circulation pump according to claim 1, wherein the magnetic coupling performs magnetic coupling in a direction parallel to a rotation axis of the outer gear.   The pump for circulating liquid refrigerant according to any one of claims 1 to 7, wherein tooth surfaces of the outer gear and the inner gear have a cycloid tooth profile.   The liquid refrigerant circulation pump according to any one of claims 1 to 8, wherein the refrigeration cycle is used in an air conditioning system for a vehicle, and a heating element of the vehicle is cooled by the liquid refrigerant.

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