WO2012114420A1

WO2012114420A1 - Cooling equipment, and motor and inverter equipped with cooling equipment

Info

Publication number: WO2012114420A1
Application number: PCT/JP2011/053651
Authority: WO
Inventors: 横山篤; 荒井雅嗣
Original assignee: 株式会社日立製作所
Priority date: 2011-02-21
Filing date: 2011-02-21
Publication date: 2012-08-30
Also published as: JPWO2012114420A1; JP5676737B2

Abstract

Provided is cooling equipment which is capable of efficiently transferring heat from a body to be cooled, such as electric equipment, to a refrigerant inside refrigerant pipes, and which is capable of effectively preventing heat in the air surrounding the cooling equipment from being absorbed by the refrigerant, thereby ensuring greater cooling performance. Also provided are a motor and inverter equipped with the cooling equipment. The cooling equipment (200) is equipped with refrigerant pipes (21) that cool the motor (100) using the refrigerant (R). The refrigerant pipes (21) are long pipes formed in flat shape as a whole. One side of the flat shape is covered by a housing (26), and the other side serves as a contact section that comes into contact with the motor (100). The space between the housing (26) and the contact section is filled with a material (F) having a thermal conductivity higher than air.

Description

Cooling device, and motor and inverter provided with the cooling device

The present invention relates to a cooling device, and a motor and an inverter including the cooling device, and more particularly to a cooling device having a high cooling performance, and a motor and an inverter including the cooling device.

In recent years, in the field of transportation equipment such as electric vehicles, hybrid vehicles, and trains, development of motors that can achieve high efficiency and high torque while being small and light is being promoted rapidly from the viewpoint of reducing environmental impact. . In addition, in this field, in addition to increasing the efficiency of the motor itself, by combining the motor and the inverter and adjusting the rotation speed and output torque, the efficiency of the motor such as an AC motor is increased. Yes.

Incidentally, it is generally known that electric devices such as the motor, inverter, and battery generate heat due to energy loss when driven. For example, in the case of an IPM motor (Interior / Permanent / Magnet / Motor) with a magnet embedded in the rotor, if the magnet temperature rises due to heat generation due to iron loss and the magnet temperature exceeds its own limit temperature, the magnet will decrease. Magnetization will cause the motor torque to drop. As described above, in the electric device, when the temperature of the electric device reaches the heat resistant temperature due to its own heat generation or the like, there is a high possibility that various performances of the electric device are deteriorated. In particular, in small and high-power electric devices, the temperature rise due to heat generation becomes significant, so in order to suppress the performance degradation and damage of the electric device, how to dissipate the heat inside the electric device to the outside and cool it down. There is an urgent issue in this field.

Patent Documents

1 and 2 disclose techniques for improving the cooling performance of such electric devices. The motor cooling device disclosed in Patent Document 1 cools the motor by providing a frame on the outside of the motor and a cooling jacket on the frame, and circulating the refrigerant in the cooling jacket.

Moreover, the cooling structure of the motor currently disclosed by patent document 2 winds a cooling water pipe around the outer peripheral surface of a motor, and cools a motor with the cooling water which flows through this cooling water pipe.
JP-A-8-251872 Japanese Patent Laid-Open No. 7-213019

According to the motor cooling device disclosed in Patent Document 1, a relatively high cooling performance can be ensured by cooling the motor using a refrigerant that can be cooler than the cooling water. On the other hand, since the refrigerant flow path is formed by combining the members constituting the motor case, when high-pressure refrigerant flows in the refrigerant flow path, the refrigerant leaks from the connection portion between the members, and the cooling performance May be reduced. Thus, for example, in a refrigerant flow path formed by combining members such as aluminum, it is necessary to improve the sealing performance of the connecting portion between the members, and it is extremely difficult to ensure high sealing performance against the high-pressure refrigerant. .

Further, according to the motor cooling structure disclosed in Patent Document 2, by using a simple structure in which a pipe having a small number of connection portions is wound around the outer peripheral surface of the motor, the cooling performance of the motor is improved by improving the sealing performance of the cooling water flow path. Efficiency can be increased. On the other hand, since the motor outer peripheral surface and the cooling water pipe having a circular cross section are in line contact, a gap exists between the motor and the cooling water pipe, and the thermal resistance between the motor outer peripheral surface and the cooling water pipe increases. Therefore, for example, even if a relatively low temperature refrigerant is used instead of the cooling water, a sufficient cooling effect cannot be obtained. In addition, when the refrigerant flowing inside the pipe is cooler than the atmosphere around the motor, the pipe is exposed to the atmosphere around the motor, so that the refrigerant that should cool the motor is heated from the surrounding atmosphere. May be absorbed, and the cooling efficiency of the motor may be reduced.

The present invention has been made in view of the above problems, and the object of the present invention is to efficiently convert the heat of the electric device into the refrigerant when the electric device such as a motor is cooled using the refrigerant of the refrigeration cycle. Another object is to provide a cooling device capable of transmitting, and a motor and an inverter including the cooling device. Furthermore, a cooling device capable of effectively preventing the heat of the atmosphere around the cooling device from being absorbed by the refrigerant and ensuring higher cooling performance, and a motor and an inverter including the cooling device are provided. It is to provide.

In order to solve the above-described problem, a cooling device according to the present invention is a cooling device including a refrigerant pipe that cools an object to be cooled with a refrigerant, and the refrigerant pipe is formed into a plane shape as a whole with a long pipe. One surface side of the surface shape is covered with a housing, and the other surface side is a contact portion with the object to be cooled, and the gap between the housing and the contact portion has a thermal conductivity higher than that of air. It is a cooling device characterized by being filled with a substance having a high content.

According to the above configuration, by using a refrigerant pipe with a small number of connection portions formed as a whole with a long pipe as a whole, even when a high-pressure refrigerant of a refrigeration cycle is used for cooling an object to be cooled such as an electric device. It is possible to suppress the leakage of the refrigerant from the refrigerant flow path and suppress the deterioration of the cooling performance of the cooling device. In addition, when the cooling device is attached to the object to be cooled, the refrigerant pipe is arranged in contact with the object to be cooled, so that the refrigerant can be arranged close to the object to be cooled, and the object to be cooled can be efficiently The object to be cooled can be cooled by absorbing the heat released from. Furthermore, by providing a housing that covers one surface side of the surface shape of the object to be cooled, and filling the gap between the housing and the contact portion of the object to be cooled with a substance having a higher thermal conductivity than air, A gap partially existing between the object to be cooled can be filled with the substance, and the heat released from the object to be cooled can be efficiently transferred to the refrigerant in the refrigerant pipe via the substance. The cooling performance of the cooling device can be further enhanced.

As can be understood from the above description, according to the present invention, the heat released from the object to be cooled can be efficiently obtained by filling the gap that can be generated between the refrigerant pipe and the object to be cooled with a substance having high thermal conductivity. Therefore, it is possible to transmit to the refrigerant in the refrigerant pipe, and to suppress an increase in the temperature of the object to be cooled, thereby realizing efficient operation of the object to be cooled.

Issues, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS It is Example 1 of the cooling device which concerns on this invention, and is the longitudinal cross-sectional view which showed the state applied to the motor. The perspective view which showed typically piping of the refrigerant | coolant pipe in the motor of FIG. The longitudinal cross-sectional view which was the Example 2 of the cooling device which concerns on this invention, and showed the state applied to the motor. The perspective view which showed typically piping of the refrigerant | coolant pipe in the motor of FIG. It is Example 3 of the cooling device which concerns on this invention, and is the figure which showed the state applied to the motor, (a) is the longitudinal cross-sectional view, (b) is the BB arrow line view of (a). The perspective view which showed typically piping of the refrigerant | coolant pipe in the motor of FIG. The perspective view which showed typically other embodiment of piping of the refrigerant | coolant pipe in the motor of Example 3. FIG. The perspective view which was Example 4 of the cooling device which concerns on this invention, and showed the state applied to the inverter. It is Example 5 of the cooling device which concerns on this invention, and is the longitudinal cross-sectional view which showed the state applied to the motor. FIG. 10 is a longitudinal sectional view in which an inverter is disposed between the motor and the cooling device shown in FIG. 9. The longitudinal cross-sectional view which showed other embodiment of piping of the refrigerant | coolant pipe shown in FIG.

DESCRIPTION OF SYMBOLS 1 Rotor 2 Stator 3 Coil 4 Level | step difference 11 Motor case 11A Motor case outer peripheral surface 12 Motor cover 13

Rotation angle sensor

14, 15 Bearing 16 Level |

step difference

20, 30, 40, 50, 60

Refrigeration equipment

20A, 30A, 40A, 50A,

60A Compression Machine

20B, 30B, 40B, 50B,

60B Heat exchanger

20C, 30C, 40C, 50C,

60C Refrigerant pump

21, 31, 41, 51, 61

Refrigerant pipe

22, 32, 42, 52, 62

Refrigerant discharge part

23, 33 , 43, 53, 63

Refrigerant supply parts

24, 25, 34, 35, 44, 45, 54, 55, 64, 65

Refrigerant hoses

26, 36, 46, 56, 66

Housing

26A, 36A, 46A, 56A Housing

inner circumference Surface

26B,

36B Fluid inlet

26C,

36C Fluid outlet

47, 67 Circuit 70

Heat exchange

71, 72 Connecting path 100 Motor body 101 Electric element 111 Inverter case 111A Inverter case upper surface 112 Substrate 150

Inverter body

200, 300, 400, 500, 600

Cooling device

330, 550, 660

Radiator

330A, 550A, 660A Fluid pump 331 551,661 Circulation path 332,552,662 Fluid outlet 333,553,663

Fluid inlet

1000,2000,3000,5000 Motor 4000 Inverter F Fluid (material)
L Rotor rotation axis R Refrigerant

Hereinafter, embodiments of a cooling device according to the present invention, and a motor and an inverter including the cooling device will be described with reference to the drawings.

[Example 1]
1 and 2 show a first embodiment of a cooling device according to the present invention, which shows a state applied to a motor.

A motor 1000 shown in FIG. 1 is roughly composed of a motor main body 100 and a cooling device 200 for cooling the motor main body 100. The motor main body 100 includes a rotating rotor 1 and a stator 2 disposed around the rotor 1 and wound with a coil 3, and a motor case 11 for housing them.

Further, the motor body 100 includes a motor cover 12 having a rotation angle sensor 13 on the inner surface 12 A on the side, and the motor cover 12 is attached to the side surface of the motor case 11, so that the rotor 1 accommodated inside the motor body 100. And the stator 2 are protected from the external environment.

A signal such as the rotation speed of the rotor 1 detected by the rotation angle sensor 13 is transmitted to a rotation control device (not shown) and used to control the rotation of the rotor 1. Further,

bearings

14 and 15 are provided between the motor case 11 and the rotor 1 and between the motor cover 12 and the rotor 1, and when the motor case 11 is fixedly attached to a vehicle or the like. In other words, the rotor 1 can rotate about the rotation axis L with respect to the motor case 11 and the motor cover 12.

A cooling device 200 for cooling the motor body 100 is disposed outside the motor body 100. The cooling device 200 cools and circulates the refrigerant pipe 21 that is spirally configured to come into contact with the outer peripheral surface 11A of the motor case 11, the housing 26 that covers the outer peripheral side of the refrigerant pipe 21, and the refrigerant R. For this reason, it is mainly composed of a cooling device 20 constituting a refrigeration cycle, which is a kind of thermodynamic cycle, that is, a compressor 20A, a heat exchanger 20B, and a refrigerant pump 20C. Here, since the refrigerant pipe 21 has fewer connection parts than a refrigerant flow path constituted by other parts formed by combining a plurality of members, for example, there are few seal members such as rubber used for the connection parts. The refrigerant hardly leaks from the seal portion, and even when a high-pressure refrigerant circulates in the refrigerant pipe 21 through the refrigeration equipment 20 or the like, excellent sealing performance and non-leakage can be ensured. The refrigerant pipe 21 has a substantially oval cross section at a portion located on the outer peripheral surface 11A of the motor case 11, and a cross section at a portion that directly contacts the outer peripheral surface 11A is linear and flat. 21 and the outer peripheral surface 11A of the motor case 11 are configured to have a cross-sectional shape in surface contact. Since the refrigerant pipe 21 has the shape, for example, the contact area between the refrigerant pipe 21 and the motor main body 100 can be increased compared to a case where the refrigerant pipe 21 has a circular cross section. The heat radiated from 100 can be effectively transmitted to the refrigerant R in the refrigerant pipe 21. The cross-sectional shape of the refrigerant pipe 21 includes a polygonal shape such as a substantially triangular shape or a substantially quadrangular shape in addition to the illustrated elliptical shape.

A refrigerant discharge part 22 and a refrigerant supply part 23 extending in parallel with the direction of the rotation axis L of the rotor 1 are provided at both ends of the refrigerant pipe 21 wound spirally along the outer peripheral surface 11A of the motor case 11. Then, the refrigerant R that has absorbed the heat radiated from the motor main body 100 through the spiral refrigerant pipe 21 is sent to the refrigeration equipment 20 via the refrigerant discharge part 22 and the refrigerant hose 24 attached to the refrigerant discharge part 22. It is configured as follows. In the refrigerant device 20, the heat of the refrigerant R is released to the outside by the compressor 20 A, the heat exchanger 20 B, and the like described above, and the cooled refrigerant R is again supplied by the refrigerant pump 20 C via the refrigerant hose 25 and the refrigerant supply unit 23. The refrigeration cycle is configured to be pressure-fed to the refrigerant pipe 21 around the motor body 100.

The cooling device 200 is made of a non-metallic material (for example, resin) that covers the refrigerant pipe 21, a part of the refrigerant discharge part 22, the refrigerant supply part 23, and the outer peripheral surface 11A of the motor case 11 (motor main body 100). A housing 26 is further provided. Of the region defined by the inner peripheral surface 26A of the housing 26 and the outer peripheral surface 11A of the motor case 11, a region other than the refrigerant pipe 21, that is, the housing 26, the refrigerant pipe 21, and the motor case. The space between the 11 contacting portions 21 A is filled with a substance F having a higher thermal conductivity than air, in particular, a fluid F having a high fluidity. Here, the fluid F is also filled in a gap 29 existing between the refrigerant pipe 21 and the outer peripheral surface 11 A of the motor case 11. The fluid F (substance) is a liquid or a resin, and examples of the liquid include an antifreeze and an inert liquid having high thermal conductivity. Examples of the resin include a high thermal conductivity resin. In addition, as long as this fluid F has fluidity | liquidity when filling the said area | region, the form solidified after filling may be sufficient.

In addition, when the heat generation of the motor body 100 is relatively small and cooling by the cooling device 20 of the refrigeration cycle is unnecessary, for example, the rotation speed of the internal compressor 20A is reduced or the rotation of the compressor 20A is stopped. The refrigerant R can be circulated only by the refrigerant pump 20C. Even when the cooling performance of the refrigeration cycle is lowered in this way, the refrigerant R can be cooled by the heat radiation from the surface of the cooling device 200, so that the cooling device 200 is operated efficiently, Temperature rise can be suppressed.

Next, a procedure (process) for assembling the motor 1000 provided with the cooling device 200 will be described. As a procedure for assembling the motor main body 100, first, a rotor 1, a stator 2 around which a coil 3 is wound, and a motor case 11 having a bearing 14 at one end are prepared. Thereafter, the stator 2 is inserted into the motor case 11 until the step 16 provided on the inner peripheral surface of the motor case 11 and the corner of the stator 2 abut, and then the bearing 14 provided on the motor case 11 and the rotor 1 The rotor 1 is inserted until the step 4 comes into contact. Then, the motor cover 12 having the bearing 15 and the rotation angle sensor 13 disposed on one surface in advance is attached to the motor case 11.

The cooling device 200 is assembled in a process different from the process of assembling the motor body 100. First, after the refrigerant pipe 21 is formed in a substantially spiral shape, the refrigerant discharge part 22 and the refrigerant supply part 23 are formed with both ends of the refrigerant pipe 21 being linear. Then, the housing 26 is attached so as to cover a part of the refrigerant pipe 21, the refrigerant discharge part 22, and the refrigerant supply part 23.

The cooling device 200 is moved in the direction of the rotation axis L of the rotor 1 (arrow A direction) so as to cover the outer peripheral surface 11A of the motor main body 100 assembled in the above procedure, and the cooling device 200 is attached to the motor main body 100 to be integrated. At this time, the flat surface of the refrigerant pipe 21 is disposed so as to contact the outer peripheral surface 11 A of the motor case 11. Thereafter, a fluid F having a thermal conductivity higher than that of air is injected into the housing 26 from a fluid inlet 26B (see FIG. 2) provided in the housing 26. The region defined by the peripheral surface 26A is filled with the fluid F. Here, since the fluid F has a predetermined fluidity when being injected into the housing 26, the air gap 29 exists in the outer peripheral surface 11 A of the refrigerant pipe 21 and the motor case 11. The fluid F enters the gap 29, and the gap 29 can be filled with the fluid F.

Also, a refrigerant hose 24 is attached to the refrigerant discharge part 22 and connected to the refrigeration equipment 20 (compressor 20A, heat exchanger 20B, refrigerant pump 20C). The refrigerant pump 20 C is connected to a refrigerant hose 25 attached to the refrigerant supply unit 23.

In addition, when removing the cooling device 200 from the motor main body 100, the fluid F can be discharged | emitted from the fluid discharge port 26C (refer FIG. 2) provided in the housing 26. FIG. Here, for example, when a resin is used as the fluid F and the resin is solidified, a step of discharging the fluid F from the fluid outlet 26C becomes unnecessary. The fluid inlet 26B and the fluid outlet 26C can be provided at any position of the housing 26.

As described above, the motor main body 100 and the cooling device 200 are individually assembled and separated after being integrated, so that the cooling device 200 can be separated from the motor main body 100 without disassembling the motor main body 100, for example. It can be detached, and the assembly and maintenance of the motor body 100 and the cooling device 200 can be improved.

FIG. 2 schematically shows the piping of the refrigerant pipe in the motor of the first embodiment. As shown in the figure, a refrigerant pipe 21 is spirally wound around the motor case 11, and the refrigerant R supplied from the refrigerant supply unit 23 via the refrigerant hose 25 rotates the rotor 1 in the refrigerant pipe 21. It flows spirally around the axis L, and is discharged from the refrigerant discharge port 22 to the outside of the housing 26. In the first embodiment, as illustrated, adjacent refrigerant pipes 21 are in contact with each other and are wound around the motor case 11 in a spiral shape.

In the first embodiment, the rotor 1 is rotationally driven by an inverter circuit (not shown), so that the refrigerant pipe having high hermeticity is mainly produced even when the copper loss of the stator 2 is converted into heat and the stator 2 generates heat. 21 is arranged close to or in contact with the outer peripheral surface 11A of the motor main body 100, and the refrigerant pipe 21 having a sealed structure that hardly leaks the high-pressure refrigerant R flowing through the refrigeration equipment 20 of the refrigeration cycle is used. The released heat (mainly heat generated from the stator 2) can be efficiently absorbed by the refrigerant R. That is, the heat released from the motor main body 100 can be efficiently transmitted to the refrigerant R in the refrigerant pipe 21 via the motor case 11 (in the direction of the arrow X1). Further, an area 29 defined by the outer peripheral surface 11A of the motor case 11 and the inner peripheral surface 26A of the housing 26, in particular, a gap 29 that can be generated between the outer peripheral surface 11A of the motor case 11 and the refrigerant pipe 21 is a fluid F. By being satisfied, for example, as compared with the case where air is present in the gap 29, the heat generated in the stator 2 and transferred to the motor case 11 can be efficiently transferred through the fluid F in the gap 29. The heat can be transmitted to the refrigerant R in the pipe 21 (in the direction of the arrow X2), and the heat released from the motor body 100 can be effectively released to the outside of the motor body 100.

Further, when the refrigerant pipe 21 having a large shape variation due to manufacturing variation or the like is used by filling the region such as the gap 29 with the fluid F having high fluidity, the fluid F has the shape variation. The area can be filled with the fluid F easily and uniformly.

Furthermore, since the heat released from the motor main body 100 can be transmitted via the fluid F having a high thermal conductivity, it is not necessary to attach the refrigerant pipe 21 firmly to the motor case 11. . Therefore, the pressure acting when the refrigerant pipe 21 is attached can be reduced, so that the refrigerant pipe 21 can be prevented from being damaged, and the cooling device 200 can be removed from the motor body 100 and maintained separately. The refrigerant pipe 21 can be easily detached from the motor case 11, and the maintainability thereof can be further improved.

In the first embodiment, for example, when the rotational speed of the rotor 1 is relatively small, the motor body 100 is driven at a relatively low temperature. That is, in such a case, the temperature of the refrigerant R circulating in the refrigerant pipe 21 is generally lower than the outside air temperature of the motor 1000. However, for example, when the housing 26 is made of a material having high thermal conductivity such as metal, the low-temperature refrigerant R in the refrigerant pipe 21 absorbs the heat of the outside air and the temperature of the refrigerant R rises, and the cooling device The cooling efficiency of 200 may be reduced.

Therefore, in the first embodiment, the housing 26 is made of a non-metallic material having a relatively low thermal conductivity, and the heat exchange between the refrigerant R and the outside air is suppressed, so that the temperature of the refrigerant R becomes the atmospheric temperature. Even when the temperature is relatively lower than the above, the heat absorption effect of the housing 26 can suppress the heat absorption of the refrigerant R to suppress the temperature rise of the refrigerant R, thereby suppressing the decrease in the cooling efficiency of the cooling device 200.

[Example 2]
3 and 4 show a second embodiment of the cooling device according to the present invention, which shows a state applied to a motor. In addition, since the motor main body used in Example 2 is the same as the motor main body 100 used in Example 1, the same code | symbol is attached | subjected and the detailed description is abbreviate | omitted.

The cooling device 300 according to the second embodiment shown in FIG. 3 is mainly shown in FIG. 1 in that adjacent refrigerant pipes 31 wound around the outer peripheral surface 11A of the motor main body 100 are arranged at a predetermined interval. This is different from the cooling device 200 of the first embodiment. The cooling device 300 also includes a circulation path 331 for circulating the fluid F in the housing 36, a fluid pump 330A for the circulation path 331, and a radiator 330 for cooling the fluid F during circulation.

As described above, the refrigerant pipe 31 is wound around the outer peripheral surface 11A of the motor main body 100 at a predetermined interval, so that the fluid F existing in the gap 29 of the first embodiment, for example, is adjacent to the refrigerant pipe 31. It can flow radially outward with respect to the outer peripheral surface 11 A of the motor body 100 through a flow path (gap) 39 formed between them. Thereby, the fluid F can ensure the heat-transfer path | route from the motor case 11 side to an outer side direction, and the fluid F between the refrigerant | coolant pipes 31 can be made to flow to the outer side of the motor main body 100. The motor main body 100 can be directly cooled by the fluid F without becoming high temperature, and the motor main body 100 can be efficiently cooled.

The fluid F that has absorbed the heat of the motor main body 100 and has flowed radially outward with respect to the outer peripheral surface 11A of the motor main body 100 flows out to the circulation path 331 via the fluid outlet 332, and then the circulation path. It is sent to a radiator 330 provided in connection with 331. Then, the heat of the fluid F is exchanged by the radiator 330 and is radiated to the outside air, and the fluid F cooled by the radiator 330 is again pumped into the housing 36 by the fluid pump 330A via the fluid inlet 333. Is done. Note that the fluid F can be smoothly circulated in the housing 36 or the circulation path 331 by using, for example, a liquid having high fluidity as the fluid F.

FIG. 4 schematically shows the piping of the refrigerant pipe in the motor of the second embodiment. As shown in the figure, the refrigerant pipes 31 are wound around the refrigerant pipes 31 that are adjacent to each other outside the motor case 11 of the motor main body 100 at intervals. Further, a fluid outlet 332 for circulating the fluid F to the circulation path 331 is provided above the housing 36, and the fluid F circulated from the circulation path 331 is disposed below the housing 36. Is provided with a fluid inlet 333 for flowing into the housing 36. The housing 36 is provided with a fluid inlet 36B and a fluid outlet 36C for injecting the fluid F. The fluid outlet 332 and the fluid inlet 333 can also be used as a fluid inlet or a fluid outlet for injecting the fluid F into the housing 36.

In the second embodiment, the refrigerant pipes 31 are arranged at intervals to increase the fluidity of the fluid F in the housing 36, and the circulation path 331 for circulating and cooling the fluid F is provided. In addition, the fluid F that can become high temperature in the housing 36 can be efficiently cooled to improve the cooling efficiency of the cooling device 300. Here, as shown in the figure, when the motor main body 100 is arranged and used so that the rotation axis L of the rotor 1 is horizontal, the heat dissipated when the rotor 1 rotates is mainly above the motor main body 100 ( The fluid F that has been radiated upward (in the vertical direction) and has reached a high temperature in the housing 36 also flows upward in the vertical direction. That is, in the housing 36, the fluid F in the vertically upper part is relatively high in temperature with respect to the fluid F in the vertically lower part. Therefore, as shown in the figure, by providing a fluid outlet 332 to the circulation path 331 vertically above, the fluid F that can become high temperature in the housing 36 can be efficiently sent to the radiator 330 for cooling. . In addition, the fluid F cooled by the radiator 330 can be returned to the housing 36 through the fluid inlet 333 provided vertically below the housing 36 to achieve efficient circulation. The operating efficiency of 300 can be further increased. When the motor 2000 is arranged so that the rotation axis L is vertical, the fluid outlet 332 of the circulation path 331 is arranged on the vertical upper side of the housing 36, and the fluid inlet 33 is set vertically. It is preferable to provide the lower side.

If the motor body 100 generates relatively little heat and cooling by the cooling device 30 in the refrigeration cycle is unnecessary, for example, the compressor 30A and the refrigerant pump 30C of the refrigeration device 30 are stopped and only the fluid pump 330A is used. Can be driven. That is, the heat released from the motor main body 100 is absorbed by the fluid F in the flow path 39 in the housing 36, the fluid F is sent to the circulation path 331, and heat is exchanged by the radiator 330 to dissipate heat to the outside air. Thus, the cooling of the motor main body 100 can be suppressed without cooling the motor main body 100 with the refrigerant R, so that the cooling device 300 can be operated efficiently.

Further, even when heat is radiated from the radiator 330 to the outside air, part of the heat released from the motor main body 100 is transmitted to the refrigerant R in the refrigerant pipe 31 via the motor case 11 and then transmitted to the fluid F. . Therefore, even if the compressor 30A of the refrigeration equipment 30 is stopped, the amount of heat transfer through the refrigerant R can be increased by driving only the refrigerant pump 30C, and the heat transfer performance of the fluid F can be further increased. This can be further improved.

[Example 3]
5 and 6 show a third embodiment of the cooling device according to the present invention, which shows a state applied to a motor. In addition, since the motor main body used in this Example 3 is the same as that of the motor main body 100 used in Example 1, the same code | symbol is attached | subjected and the detailed description is abbreviate | omitted.

As described in the second embodiment, also in the third embodiment, when the motor 3000 is arranged in the vehicle so that the rotation axis L of the rotor 1 is horizontal, the heat radiated when the rotor 1 rotates is mainly the motor. Heat is dissipated upward (vertically upward) of the main body 100, and the fluid F that has reached a high temperature in the housing 46 also flows vertically upward. In the housing 46, the fluid F in the vertically upward direction particularly flows vertically downward. The temperature becomes relatively high with respect to the body F.

Therefore, in the third embodiment, as shown in FIG. 5A, the refrigerant pipes 41 are concentrated on the upper side of the motor body 100 in the vertical direction. Thereby, the heat dissipated from the motor main body 100 can be efficiently transmitted to the refrigerant R in the refrigerant pipe 41, and the fluid F on the vertically upper side can be efficiently cooled by the refrigerant R. Therefore, the cooling device 400 can be reduced in size and weight while maintaining the cooling performance of the cooling device 400, and thus the motor 3000 can be reduced in size and weight.

FIG. 6 schematically shows the piping of the refrigerant pipe 41 of the motor 3000 shown in FIG. As shown in the figure, in the third embodiment, the refrigerant pipe 41 is mainly disposed so as to be substantially parallel to the rotation axis L of the rotor 1 and meanders (zigzag) outside the motor case 11 in the circumferential direction. Are arranged in a plane shape as a whole.

With this configuration, the refrigerant supply unit 43 and the refrigerant discharge unit 42 can be provided at different positions on the outer peripheral surface 11A of the motor main body 100, and either the same direction in the rotation axis L direction of the motor main body 100 or the opposite direction. It can also be provided in the direction. In particular, as shown in the drawing, the refrigerant supply section 43 and the refrigerant discharge section 42 are provided in the same direction in the direction of the rotation axis L of the motor main body 100, so that the refrigerant pipe 41 is mounted in the state where the housing 46 is attached to the motor main body 100. The cap 46B and the like can be pulled out (in the direction of arrow C) from the outer peripheral surface 11A of the motor main body 100 and removed. As a result, the refrigerant pipe 41 can be separated without disassembling the motor main body 100 and the housing 46, and the assemblability and maintainability of the cooling device 400 can be further improved.

The cross-sectional shape of the refrigerant pipe 41 can be the same cross-sectional shape as in the first and second embodiments, that is, a cross-sectional shape that can come into surface contact with the outer peripheral surface of the motor case 11.

FIG. 7 schematically shows another embodiment of the refrigerant pipe piping in the motor of the third embodiment. With this configuration, the refrigerant pipe 41 is mainly disposed so as to be perpendicular to the rotation axis L of the motor body 100, and is disposed so as to meander the outside of the motor case 11 in the direction of the rotation axis L. Thereby, the refrigerant supply unit 43 and the refrigerant discharge unit 42 can be provided in the same position on the outer peripheral surface 11 A of the motor case 11 in the direction opposite to the rotation axis L of the motor body 100.

As shown in FIG. 5A, the refrigerant R absorbs heat radiated from the motor main body 100 and heat of the fluid F, and enters the refrigeration equipment 40 via the refrigerant hose 44 attached to the housing 46. Then, it is cooled by the compressor 40A, the heat exchanger 40B, etc. of the refrigeration equipment 40, and is again pumped to the refrigerant pipe 41 via the refrigerant hose 45 by the refrigerant pump 40C. Here, the refrigerant pipe 41 and the

refrigerant hoses

44 and 45 are connected via a housing cap 46B, and the housing 46 is sealed by the housing cap 46B.

In Example 3, a circulation path for circulating the fluid F, a fluid pump, a radiator for cooling the fluid F, and the like are not provided. However, by providing the circulation path 47 in a region defined by the outer peripheral surface 11A of the motor case 11 and the inner peripheral surface 46A of the housing 46, the heat is absorbed and the temperature becomes relatively high, and the specific gravity is reduced. The body F flows vertically upward, is cooled by the refrigerant R provided vertically above, and the fluid F having a higher specific gravity flows vertically downward. That is, the fluid F is circulated by the circulation passage 47 provided around the motor body 100 by natural convection utilizing the specific gravity difference of the fluid F in the housing 46 without using a circulation path or a pump. Can do. As a result, the fluid pump or the like is not necessary, and further simplification of the configuration and size reduction of the physique can be achieved.

In order to enhance the fluidity of the fluid F in the housing 46, the refrigerant pipes 41 arranged on the outer peripheral surface 11A of the motor case 11 are spaced apart from each other as shown in FIG. The flow path (gap) 49 for the fluid F is formed. Further, the refrigerant pipe 41 having a circular cross section shown in the figure can be configured in the same manner as in the first and second embodiments so that the refrigerant pipe 41 and the outer peripheral surface 11A of the motor main body 100 are brought into surface contact.

[Example 4]
FIG. 8 is a fourth embodiment of the cooling device according to the present invention, and shows a state applied to an inverter, with a part cut away so that the inside of the inverter main body 150 and the cooling device 500 can be seen. It is a thing.

The inverter 4000 shown in the figure is generally composed of an approximately rectangular parallelepiped inverter main body 150 and a cooling device 500 for cooling the inverter main body 150. The inverter main body 150 includes a substrate 112, an inverter case 111, and an electric element 101 made of a semiconductor element or a passive element. The electric element 101 is placed on the substrate 112 and covered with the inverter case 111.

A cooling device 500 for cooling the inverter main body 150 is disposed on the outer peripheral side of the inverter main body 150 (on the upper surface 111A side of the inverter case 111). The cooling device 500 includes a refrigerant pipe 51, a housing 56 made of a nonmetallic material for covering the outside of the refrigerant pipe 51, and a refrigeration apparatus 50 (which constitutes a refrigeration cycle for cooling and circulating the refrigerant R). The compressor 50A, the heat exchanger 50B, and the refrigerant pump 50C) are generally configured. Further, the refrigerant pipe 51 is meandering (zigzag) so as to come into contact with the upper surface 111 A of the inverter case 111 and is arranged in a planar shape as a whole. In the fourth embodiment as well, the refrigerant pipe 51 has the same configuration as the first embodiment in the contact portion 51A that contacts the upper surface 111A of the inverter case 111, and the upper surface 111A of the refrigerant pipe 51 and the inverter case 111. Are in surface contact. Further, the refrigerant pipe 51 in the housing 56 is disposed above the electric element 101 such as a transistor having a particularly large calorific value, so that the heat radiated from the electric element 101 can be efficiently transferred to the refrigerant R in the refrigerant pipe 51. Can be communicated to. The refrigerant pipe 51 may be provided on the lower surface of the inverter main body 150 or may be provided so as to go around the inverter main body 150.

Similarly to the other embodiments, a refrigerant discharge part 52 and a refrigerant supply part 53 are provided at both ends of the refrigerant pipe 51 provided on the upper surface 111A of the inverter case 111, and the electric element 101 passes through the refrigerant pipe 51. The refrigerant R that has absorbed the heat released from the refrigerant is sent to the refrigeration equipment 50 of the refrigeration cycle via the refrigerant discharge part 52 and the refrigerant hose 54 attached to the refrigerant discharge part 52. In the refrigerant device 50, the heat of the refrigerant R is released to the outside by the compressor 50A, the heat exchanger 50B, etc., and the refrigerant R cooled by the refrigerant R is again supplied to the refrigerant R through the refrigerant hose 55 and the refrigerant supply unit 53 by the refrigerant pump 50C. It is pumped to the pipe 51.

In addition, the cooling device 500 includes a region other than the refrigerant pipe 51 among regions defined by the inner peripheral surface 56A of the housing 56 and the upper surface 111A of the inverter case 111, that is, a contact portion 51A between the housing 56 and the refrigerant pipe 51. The space between them is filled with the fluid F, and similarly to the second embodiment, a circulation path 551, an inverter 550, and a fluid pump 550A are provided. As a result, the fluid F that has reached a high temperature in the housing 56 is sent to the circulation path 551 via the fluid outlet 552, and is heat-exchanged by the radiator 550 connected to the circulation path 551. Is radiated to the outside air, and the cooled fluid F is pumped into the housing 56 via the fluid inlet 553 by the fluid pump 550A. In order to improve the fluidity of the fluid F in the housing 56, the adjacent refrigerant pipes 51 provided on the upper surface 111A of the inverter main body 150 are arranged at intervals from each other and flow from the inverter case 111. A heat transfer path for heat transferred to the body F is secured.

[Example 5]
FIG. 9 is a fifth embodiment of the cooling device according to the present invention, and shows a state applied to a motor. The motor main body used in the fifth embodiment has the same configuration as that of the motor main body 100 used in the first to fourth embodiments. Therefore, the same reference numerals are given and detailed description thereof is omitted.

The illustrated motor 5000 includes a circulation path 661 for circulating the fluid F in the housing 66, a fluid pump 660A, and a radiator 660 for cooling the fluid F. In the motor 5000, the motor body 100 and the housing 66 of the cooling device 600 are integrally formed by an integral housing 69 in which a circulation path 67 is provided around the outer peripheral surface 11A of the motor case 11. The housing 66 of the cooling device 600 and the circulation path 67 are connected by a connection path 72. As a result, the fluid F that has flowed through the housing 66 and absorbed the heat released from the motor main body 100 is sent to the circulation path 67 by the connection path 72. Thereafter, the fluid F flows around the motor body 100 along the circulation path 67 while further absorbing heat released from the motor body 100, and is provided in the circulation path 661 via the fluid outlet 662. The heat is transferred to the pump 660A, the heat is radiated to the outside air by the radiator 660, and the cooled fluid F is sent to the heat exchanger 70 via the fluid inlet 663. To be pumped.

In the fifth embodiment, the heat exchanger 70 is provided in the housing 66 of the cooling device 600 through which the fluid F flows. That is, when flowing through the circulation path 67 provided on the outer peripheral surface 11 A of the motor main body 100, the fluid F that is heated to the heat dissipated from the motor main body 100 and sent to the heat exchanger 70 via the radiator 660 is Further, the heat exchanger 70 further cools by the refrigeration equipment 60 of the refrigeration cycle. That is, heat exchange is performed between the refrigerant R in the refrigerant pipe 61A supplied to the heat exchanger 70 via the refrigerant supply unit 63A and the fluid F flowing through the circulation path 661, and the fluid F further To be cooled. The refrigerant R that has absorbed the heat of the fluid F is transferred to the refrigeration cycle cooling device 60 (the compressor 60A, the heat exchanger 60B, and the refrigerant pump 60C) connected to the refrigerant hose 64A via the refrigerant discharge portion 62A. Then, the pressure is again sent to the refrigerant pipe 61 in the housing 66 through the refrigerant hose 65 and the refrigerant supply unit 63. Then, the refrigerant R that has absorbed the heat of the motor main body 100 with the refrigerant pipe 61 arranged in, for example, a zigzag shape in the housing 66 is sent to the refrigerant hose 64 via the refrigerant discharge part 62 and supplied with the refrigerant hose 65A. It is sent to the heat exchanger 70 via the part 63A.

Further, the fluid F cooled by the refrigerant R in the refrigerant pipe 61A is sent into the housing 66 through the connection path 71 and is radiated from the motor main body 100 while flowing in the housing 66 as described above. The heat is absorbed and supplied again to the circulation path 67 disposed around the motor main body 100 by the connection path 72, and the motor main body 100 is cooled.

In this way, the fluid F in the housing 66 is circulated using the circulation path 661 and the like, and the fluid F used for cooling the motor main body 100 by the heat exchanger 70 and the refrigerant R in the refrigerant pipe 61A Since the fluid F flowing in the housing 66 of the cooling device 600 can be cooled more efficiently and the flow rate of the flowing fluid F can be further suppressed, the entire fluid F can be reduced. Thus, the fluid F can be cooled with good responsiveness.

FIG. 10 shows an arrangement in which an inverter is interposed between the motor and the cooling device shown in FIG. 9, and the cooling device is applied to an inverter main body 150 and a motor main body 100 that are integrated. The illustrated inverter main body 150 is the same as the inverter main body 150 used in the fourth embodiment, and thus the same reference numerals are given and detailed description thereof is omitted.

As shown in the figure, the motor main body 100 and the inverter 150 are integrated with each other by an integral housing 69 of the motor main body 100, and a cooling device 600A is attached to the upper side.

Thus, by disposing the inverter main body 150 between the motor main body 100 and the cooling device 600A, the heat dissipated from the inverter main body 150 by the cooling device 600A can be absorbed, and the motor main body 100 and the inverter main body can be absorbed. Both 150 can be cooled. Moreover, compared with the case where the motor main body 100 and the inverter main body 150 are separately disposed and cooled by the cooling device, the length of the piping of the fluid F flowing through the entire motor 5000A can be suppressed, and the entire motor 5000A can be reduced. Smaller and lighter can be achieved. In addition, for example, when the fluid F is made of a liquid having a large heat capacity such as water, the heat capacity of the fluid F is reduced by reducing the overall flow rate of the fluid F, thereby cooling the fluid F with high responsiveness. The cooling efficiency of the cooling device 600A can be increased.

In addition, when attaching a cooling device to what united the motor main body 100 and the inverter main body 150, you may attach a separate cooling device to both the motor main body 100 and the inverter main body 150, respectively. Moreover, the inverter main body 150 may be attached to the opposite side of the motor main body 100 to which the cooling device is attached, or the cooling device may be interposed between the motor main body 100 and the inverter main body 150.

FIG. 11 shows another embodiment of the piping of the refrigerant pipe shown in FIG.

As shown in the figure, the inside of the housing 66 of the cooling device 600B is filled with only the fluid F, the fluid F is circulated through the

circulation paths

67 and 661, and cooled by heat exchange in the radiator 660, so that the motor The main body 100 and the inverter main body 150 can also be cooled. In addition, the heat exchanger 70 is provided in the motor 5000B, and the heat radiated from the motor main body 100 and the inverter main body 150 and absorbed by the fluid F flows into the refrigerant pipe 61A in the heat exchanger 70. It is transmitted to R and radiated to the outside of the motor 5000B.

Although five embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various changes in design can be made without departing from the spirit of the invention described in the claims. It can be done. In the said Example, although the Example which cools the to-be-cooled body which consists of electric equipments, such as a motor and an inverter, using the cooling device which concerns on this invention was described, the said cooling device can also be applied to a battery.

As can be understood from the above description, according to the first to fifth embodiments, the cooling performance of the cooling device is improved while using a refrigerant pipe having a sealed structure in which high-pressure refrigerant is difficult to leak. The heat radiated from the body can be efficiently radiated to the outside. Thereby, the to-be-cooled body can be efficiently operated while suppressing the temperature rise of the to-be-cooled body. Further, by optimizing the arrangement of the refrigerant pipes, it is possible to reduce the size and weight of the cooling device, and it is possible to reduce the overall size of the cooling device even when it is attached to an electric device or the like. Furthermore, by making the cooling device detachable from the electric device without disassembling the electric device such as a motor, inverter, battery, etc., it is possible to improve the assemblability and maintainability of the electric device that is the cooling device and the cooled object. it can.

Note that the present invention is not limited to the first to fifth embodiments described above, and includes various modifications. For example, the first to fifth embodiments described above are described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configurations of the first to fifth embodiments.

Also, the control lines and information lines indicate what is considered necessary for the explanation, and not all the control lines and information lines on the product are necessarily shown. In practice, it may be considered that almost all the components are connected to each other.

Claims

A cooling device including a refrigerant pipe for cooling an object to be cooled with a refrigerant,
The refrigerant pipe is a long pipe formed into a surface shape as a whole, one surface side of the surface shape is covered with a housing, and the other surface side is a contact portion with the object to be cooled,
A cooling device, wherein a gap between the housing and the contact portion is filled with a substance having a higher thermal conductivity than air.
The cooling device according to claim 1, wherein the refrigerant pipe has a surface shape in which the refrigerant pipe is formed in a spiral shape.
The cooling device according to claim 1, wherein the refrigerant pipe has a surface shape in which the refrigerant pipe is formed in a zigzag shape.
The cooling device according to claim 3, wherein the refrigerant pipe is formed in a zigzag shape in a parallel direction with respect to the adjacent pipes having the planar shape.
The cooling device according to claim 1, wherein the refrigerant pipes are arranged such that adjacent pipes having the planar shape are spaced apart from each other.
The cooling device according to claim 1, wherein the refrigerant pipe has a cross-sectional shape in which a contact portion of the refrigerant pipe with the object to be cooled can come into contact with the object to be cooled as a surface.
The cooling device according to claim 6, wherein the cross-sectional shape is an elliptical shape, a polygonal shape such as a triangular shape or a quadrangular shape.
The cooling device according to claim 1, wherein the substance is a high thermal conductive resin.
The cooling device according to claim 1, wherein the substance is a liquid.
10. The cooling apparatus according to claim 9, wherein the liquid is an antifreeze liquid or an inert liquid.
The cooling device according to claim 1, wherein the housing is made of a non-metallic material.
The cooling device according to claim 1, wherein the refrigerant pipe constitutes a refrigeration cycle in which the refrigerant is circulated with a cooling device such as a compressor, a heat exchanger, and a refrigerant pump.
The cooling device according to claim 1, wherein the object to be cooled is an electric device.
14. The cooling device according to claim 13, wherein the electric device is a battery, a motor and / or an inverter.
A motor comprising the cooling device according to claim 1,
The motor includes a motor body having a rotating rotor, a stator disposed around the rotor, and a motor case covering the rotor and the stator,
The said cooling device has arrange | positioned the said contact part of the said surface shape of the said refrigerant | coolant pipe in contact with the outer periphery of the said motor case.
The motor according to claim 15, wherein the housing is made of a non-metallic material.
The motor according to claim 15, wherein the refrigerant pipe constitutes a refrigeration cycle in which the refrigerant is circulated with a cooling device such as a compressor, a heat exchanger, and a refrigerant pump.
The motor according to claim 15, wherein the substance is a high thermal conductive resin.
The motor according to claim 15, wherein the substance is a liquid.
The motor according to claim 19, wherein the refrigerant pipe has a surface shape in which the refrigerant pipe is formed in a spiral shape, and adjacent pipes having the surface shape are spaced apart from each other. .
The cooling device includes a circulation path that circulates the liquid filled in a gap between the housing and the contact portion, a fluid pump, and a radiator that cools the liquid. The motor according to claim 20.
The motor according to claim 19, wherein the refrigerant pipe has a surface shape in which the pipe is formed in a zigzag shape, and adjacent pipes of the surface shape are arranged with a space therebetween.
The said refrigerant | coolant pipe is formed in the zigzag shape in the direction in which each said pipe of the said surface shape is parallel to the rotation-axis direction of the said rotor, or the direction orthogonal to the direction, It is characterized by the above-mentioned. motor.
The said motor is provided with the circulation path of the said liquid between the internal peripheral surface of the said housing, and the outer peripheral surface of the said motor case other than the space | gap between the said housing and the said contact part. Item 24. The motor according to Item 23.
The cooling device includes a circulation path that circulates the liquid filled in a gap between the housing and the contact portion, a fluid pump, and a radiator that cools the liquid. The motor according to claim 23.
26. The motor according to claim 25, further comprising a heat exchanger that cools the liquid that has passed through the radiator with the refrigerant of the cooling device.
27. The motor according to claim 26, wherein an inverter main body is interposed between the motor main body and the housing of the cooling device.
An inverter comprising the cooling device according to claim 1,
The inverter includes an inverter body having a substrate, an electric element, and an inverter case,
The said cooling device has arrange | positioned the said contact part of the said surface shape of the said refrigerant | coolant pipe in contact with the outer periphery of the said inverter case, The inverter characterized by the above-mentioned.
The inverter according to claim 28, wherein the housing is made of a non-metallic material.
The refrigerant pipe has a surface shape in which the refrigerant pipe is formed in a zigzag shape, and adjacent pipes of the surface shape are arranged with a space between each other, and a cooling device such as a compressor, a heat exchanger, a refrigerant pump, or the like Constitute a refrigeration cycle that circulates refrigerant,
The cooling device includes a circulation path and a fluid pump for circulating a liquid that is a substance having a higher thermal conductivity than air filled in a gap between the housing and the contact portion, and a radiator for cooling the liquid The inverter according to claim 28, comprising: