CN116113210A

CN116113210A - Heat dissipation system of power module and control method thereof

Info

Publication number: CN116113210A
Application number: CN202310081782.5A
Authority: CN
Inventors: 黄玉优; 林海佳; 康建; 赖桃辉; 李蓉; 喻磊
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2023-01-17
Filing date: 2023-01-17
Publication date: 2023-05-12

Abstract

The invention provides a heat dissipation system of a power module and a control method thereof, wherein the heat dissipation system of the power module comprises: the heat pipe system comprises an evaporation section and a condensation section, the condensation section can exchange heat with a refrigerant in the fluorine pump air conditioning system to release heat to the refrigerant, the evaporation section can exchange heat with the power module to absorb heat and cool the power module, the adjustable heat conduction module is arranged between the evaporation section and the power module, and the adjustable heat conduction module can increase heat transfer thermal resistance when the fluorine pump air conditioning system operates in a fluorine pump refrigeration mode and reduce or prevent heat exchange between the power module and the evaporation section. According to the invention, the adjustable heat conduction module can be selectively controlled to increase heat transfer resistance particularly in a fluorine pump refrigeration mode, so that the condensation phenomenon formed at the power module by low-temperature cold energy conduction is effectively prevented, and the problem of safety is avoided.

Description

Heat dissipation system of power module and control method thereof

Technical Field

The invention relates to the technical field of heat dissipation, in particular to a heat dissipation system of a power module and a control method thereof.

Background

With the wide application of 4G and the gradual popularization of 5G, the heating value of various data processing devices is larger and larger, and the requirements of the data center on the refrigerating capacity and energy conservation of the air conditioning devices are also higher and larger.

The outdoor natural cold source in transitional seasons and cold winter is adopted for cooling the data center, so that the running cost of air conditioning equipment can be greatly reduced, a fluorine pump air conditioner is commonly adopted, a fluorine pump mode is started in winter, the running of a compressor is stopped, the fluorine pump is used for driving a refrigerant to realize the refrigerating running of a heat pipe, and the running cost of the equipment is greatly reduced.

Due to the change of the heat load of the data center and the change of the outdoor environment temperature, the refrigerating capacity output of the air conditioner of the data center machine room needs to be correspondingly and intelligently adjusted and controlled so as to meet the requirements of the data center on the air conditioning constant temperature and humidity, and most of the currently mainstream variable capacity output refrigerating systems adopt variable frequency control, such as a variable frequency compressor, a direct current speed regulation fan and the like.

The variable-frequency compression refrigeration cycle system combined with the fluorine pump cycle is generally provided with an IPM intelligent power module with relatively large heating value. Along with the increasing heating value of the intelligent power module, the requirement on a heat dissipation system of the intelligent power module is also higher, the transverse thermal diffusivity of the intelligent power module on the market is poor, the heat capacity is small, and when the intelligent power module starts to work instantly, a power chip (such as an IGBT chip, an FRD chip or an MOS chip) can generate larger heat, and the temperature of the IGBT chip, the FRD chip or the MOS chip is suddenly increased to damage the power chip. The calorific capacity of intelligent power module often changes, but many times do not carry out accurate control to the cooling fluid when the design, lead to intelligent power module's operating temperature fluctuation to be great, appear overtemperature or surface temperature to be less than air dew point temperature easily, and surface temperature is less than air dew point temperature and forms the condensate water on the radiator surface easily, this causes serious security threat to the controller.

Because the electric power used by the fluorine pump circulation is much smaller than that used by the compression refrigeration circulation, the heating value of the power module is also smaller, and accordingly, the flow rate of cooling fluid of the power module can be much smaller; the power module does not participate in the working operation even when the fluorine pump circulates, i.e. no cooling is required. However, when the outdoor environment temperature is very low, the temperature of the outdoor liquid refrigerant pumped by the fluorine pump is very low, and low-temperature cold energy is easily conducted to the radiator of the IPM intelligent power module through a copper pipe and the like, so that the condensation phenomenon occurs.

Because the heat dissipation system of the IPM module in the prior art can easily cause condensation of the IPM intelligent power module in a fluorine pump mode when the fluorine pump air conditioning system is used for cooling the IPM module, and further causes technical problems of safety and the like, the invention designs the heat dissipation system of the power module and a control method thereof.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect that condensation is easily caused to the IPM intelligent power module in a fluorine pump mode when the IPM module is cooled by the fluorine pump air conditioning system in the prior art, so as to provide the heat dissipation system of the power module and the control method thereof.

In order to solve the above-mentioned problems, the present invention provides a heat dissipation system of a power module, comprising:

the heat pipe system comprises an evaporation section and a condensation section, the condensation section can exchange heat with a refrigerant in the fluorine pump air conditioning system to release heat to the refrigerant, the evaporation section can exchange heat with the power module to absorb heat and cool the power module, the adjustable heat conduction module is arranged between the evaporation section and the power module, and the adjustable heat conduction module can increase heat transfer thermal resistance when the fluorine pump air conditioning system operates in a fluorine pump refrigeration mode and reduce or prevent heat exchange between the power module and the evaporation section.

In some embodiments, the adjustable heat conduction module is further capable of reducing heat transfer resistance, increasing or turning on heat exchange between the power module and the evaporator end when the fluorine pump air conditioning system is operating in a compression refrigeration mode;

the adjustable heat conduction module can also increase heat transfer resistance when the fluorine pump air conditioning system is stopped, and reduce or prevent heat exchange between the power module and the evaporation section.

In some embodiments, the adjustable heat conduction module comprises a first shell and a second shell, one end of the first shell is connected with the evaporation section, the other end of the first shell can be connected with the second shell, one end of the second shell far away from the first shell is connected with the power module, the first shell and the second shell can move relatively, and a heat conduction material is arranged in the first shell and/or the second shell, and the heat conduction coefficient of the heat conduction material is respectively larger than that of the first shell and that of the second shell; when the fluorine pump air conditioning system operates in a fluorine pump refrigeration mode or is stopped, the first shell and the second shell move oppositely; when the fluorine pump air conditioning system operates in a compression refrigeration mode, the first shell and the second shell move towards each other.

In some embodiments, when the first housing and the second housing move toward each other, the first housing can be sleeved on the outer periphery of the second housing or the second housing can be sleeved on the outer periphery of the first housing, and when the first housing and the second housing move away from each other, the first housing is gradually separated from the sleeve connection with the second housing.

In some embodiments, the adjustable thermal conduction module further comprises a drive mechanism capable of driving the first housing and the second housing to move toward or away from each other; the heat conducting material is heat conducting silicone grease, and the materials of the first shell and the second shell are plastics; and a limiting structure is arranged between the first shell and the second shell, so that the first shell and the second shell are not completely disconnected when the first shell and the second shell move oppositely.

In some embodiments, the heat pipe system further comprises a first pipe, a second pipe and a control valve, wherein the first pipe is communicated between one end of the evaporation section and one end of the condensation section, the second pipe is communicated between the other end of the evaporation section and the other end of the condensation section, and the control valve is arranged on the first pipe and/or the second pipe.

In some embodiments, the first and second conduits are both insulated conduits, the control valve is a solenoid valve capable of controlling conduit closure, or the control valve is an electronic expansion valve capable of controlling flow size changes; and a refrigerant is introduced into the first pipeline and the second pipeline, and the refrigerant are the same or different substances.

In some embodiments, the power module is provided with a temperature sensor, the control valve can control the flow of the refrigerant according to the temperature of the power module, when the temperature of the power module rises, the control valve is controlled to increase the opening degree, when the temperature of the power module drops, the control valve is controlled to decrease the opening degree, and when the power module does not work, the control valve is closed.

In some embodiments, the power module is not operated when the fluorine pump air conditioning system is operating in a fluorine pump cooling mode or in a shutdown state; when the fluorine pump air conditioning system operates in a compression refrigeration mode, the control valve is opened, and the flow of the refrigerant is controlled according to the temperature of the power module.

In some embodiments, the fluorine pump air conditioning system includes a compressor and a condenser, the condensing section being disposed at a location between an outlet of the condenser and an intake of the compressor to exchange heat with a pipe or component between the outlet of the condenser and the intake of the compressor.

In some embodiments, the fluorine pump air conditioning system further comprises a liquid storage tank and a fluorine pump, wherein the liquid storage tank is arranged between the outlet of the condenser and the fluorine pump, and the condensation section is arranged inside the liquid storage tank so as to exchange heat with the refrigerant in the liquid storage tank.

In some embodiments, the fluorine pump air conditioning system further comprises an evaporator, a throttle valve, a one-way valve A, a one-way valve B, a gas-liquid separator, an inner fan and an outer fan, wherein the air suction port of the compressor is communicated with the gas-liquid separator, the one-way valve B is arranged at two ends of the compressor after being communicated with the gas-liquid separator in series in parallel, the one-way valve A is arranged at two ends of the fluorine pump in parallel, the throttle valve is arranged between the fluorine pump and the evaporator, the inner fan blows or sucks air to the evaporator, and the outer fan blows or sucks air to the condenser.

The invention also provides a control method of the heat dissipation system of the power module, which comprises the following steps:

judging whether the fluorine pump air conditioning system operates or not and an operation mode of the fluorine pump air conditioning system during operation;

a control step of controlling the adjustable heat conduction module to increase heat transfer resistance when the fluorine pump air conditioning system is judged to be in a shutdown state; when the operation mode of the fluorine pump air conditioning system is judged to be a fluorine pump refrigeration mode, controlling the adjustable heat conduction module to increase heat transfer resistance; and when the operation mode of the fluorine pump air conditioning system is judged to be the compression refrigeration mode, controlling the adjustable heat conduction module to reduce heat transfer resistance.

In some embodiments, when the adjustable thermally conductive module comprises a first housing and a second housing, and the first housing and/or the second housing is internally provided with a thermally conductive material:

a control step of controlling the first shell and the second shell to move oppositely so that the heat conducting material is not filled in an inner space surrounded by the first shell and the second shell when the fluorine pump air conditioning system is judged to be in a stop state; when the operation mode of the fluorine pump air conditioning system is judged to be a fluorine pump refrigerating mode, the first shell and the second shell are controlled to move oppositely so that the heat conducting material is not filled in an inner space enclosed by the first shell and the second shell; when the operation mode of the fluorine pump air conditioning system is judged to be a compression refrigeration mode, the first shell and the second shell are controlled to move oppositely, so that the heat conducting material fills the inner space enclosed by the first shell and the second shell.

In some embodiments, when the heat pipe system further comprises a first pipe, a second pipe, and a control valve, and the power module is provided with a temperature sensor thereon:

in the control step, when the fluorine pump air conditioning system is judged to be in a stop state, the control valve is controlled to be closed; and when the operation mode of the fluorine pump air conditioning system is judged to be the fluorine pump refrigerating mode, the control valve is controlled to be closed.

In some embodiments, when it is determined that the fluorine pump air conditioning system is operating and the operating mode is a compression cooling mode:

the control method further includes a detection step of detecting a temperature of the power module by the temperature sensor;

the judging step judges whether the temperature of the power module is lower than a preset temperature;

the control step is to control the opening degree of the control valve to be reduced when the temperature of the power module is lower than the preset temperature; and when the temperature of the power module is higher than the preset temperature, controlling the opening degree of the control valve to be increased.

The heat radiation system of the power module and the control method thereof have the following beneficial effects:

1. according to the invention, the heat pipe system is effectively connected between the power module and the fluorine pump air conditioning system by arranging the fluorine pump air conditioning system, the heat pipe system, the power module and the adjustable heat conduction module, so that the cooling capacity of the refrigerant in the fluorine pump air conditioning system can be effectively utilized to effectively cool and dissipate heat of the power module; the adjustable heat conduction module arranged between the power module and the evaporation section can selectively increase heat transfer resistance or reduce heat transfer resistance according to different modes or shutdown states of the fluorine pump air conditioning system, and particularly, the adjustable heat conduction module is selectively controlled to increase the heat transfer resistance in a fluorine pump refrigeration mode, so that heat exchange between the power module and the evaporation section is reduced or prevented, condensation phenomenon formed at the power module by low-temperature cold energy conduction is further effectively prevented, and the problem of safety is avoided; the cooling plate of the IPM intelligent power module is connected with the refrigerant pipeline of the fluorine pump air conditioner through a separated heat pipe system, the cooling capacity of the low-temperature or normal-temperature refrigerant can be conducted to the cooling plate of the IPM intelligent power module, so that the IPM module is cooled; the heat pipe and the IPM module are separated through the adjustable heat conduction module, so that condensation is prevented from being generated by conduction to low temperature when the IPM module does not work; the distance between the heat pipe evaporation section and the IPM module is adjusted through the adjustable heat conduction module, so that heat conduction is reduced, and condensation water generated by conduction to low temperature when the IPM module does not work is prevented;

2. The temperature sensor is arranged on the power module, the control valve is arranged on the heat pipe system, and the temperature of the power module detected by the temperature sensor is used for controlling the control valve, so that the accurate control of the temperature of the power module is realized, the condition that the temperature of the power module is too low or too high is prevented, and the safe and reliable operation of the power module is ensured; when the IPM module does not work, the control valve is closed, and the distance between the IPM module and the evaporation section of the heat pipe is adjusted to reduce heat conduction, so that heat transfer of the heat pipe is blocked, low-temperature cold energy is prevented from being conducted to the IPM module, and therefore dew is prevented.

Drawings

FIG. 1 is a schematic diagram of a heat dissipation system of a power module according to the present invention;

fig. 2 is a schematic structural diagram of an adjustable heat conduction module in the heat dissipation system of the power module according to the present invention.

The reference numerals are expressed as:

100. a heat pipe system; 200. a power module; 300. an adjustable heat conduction module; 1. an evaporation section; 2. a condensing section; 3. a first pipe; 4. a second pipe; 5. a control valve; 6. a compressor; 7. a condenser; 8. a liquid storage tank; 9. a fluorine pump; 10. an evaporator; 11. a throttle valve; 12. a one-way valve A; 13. a one-way valve B; 14. a gas-liquid separator; 15. an inner fan; 16. an external fan; 17. a first housing; 18. a second housing; 19. a thermally conductive material; 20. a driving mechanism.

Detailed Description

As shown in fig. 1-2, the present invention provides a heat dissipation system of a power module, comprising:

the heat pipe system 100 comprises an evaporation section 1 and a condensation section 2, the condensation section 2 can exchange heat with a refrigerant in the fluorine pump air conditioning system to release heat to the refrigerant, the evaporation section 1 can exchange heat with the power module 200 to absorb heat and cool the power module 200, the adjustable heat conduction module 300 is arranged between the evaporation section 1 and the power module 200, and the adjustable heat conduction module 300 can increase heat transfer resistance when the fluorine pump air conditioning system operates in a fluorine pump refrigeration mode and reduce or prevent heat exchange between the power module 200 and the evaporation section 1.

According to the invention, the heat pipe system is effectively connected between the power module and the fluorine pump air conditioning system by arranging the fluorine pump air conditioning system, the heat pipe system, the power module and the adjustable heat conduction module, so that the cooling capacity of the refrigerant in the fluorine pump air conditioning system can be effectively utilized to effectively cool and dissipate heat of the power module; and the adjustable heat conduction module arranged between the power module and the evaporation section can selectively increase heat transfer resistance or reduce heat transfer resistance according to different modes or shutdown states of the fluorine pump air conditioning system, and particularly, the adjustable heat conduction module is selectively controlled to increase the heat transfer resistance in a fluorine pump refrigeration mode, so that heat exchange between the power module and the evaporation section is reduced or prevented, condensation phenomenon formed at the power module by low-temperature cold energy conduction is further effectively prevented, and the problem of safety is avoided.

The power module is preferably an IPM intelligent power module (IPM is Intelligent Power Module abbreviated as intelligent power module), and is connected with a radiating plate of the IPM intelligent power module and a refrigerant pipeline of a fluorine pump air conditioner through a separated heat pipe system, so that the cooling capacity of low-temperature or normal-temperature refrigerant can be conducted to the radiating plate of the IPM intelligent power module, and the IPM module is cooled; the heat pipe and the IPM module are separated through the adjustable heat conduction module, so that condensation is prevented from being generated by conduction to low temperature when the IPM module does not work; and the distance between the evaporation section of the heat pipe and the IPM module is adjusted through the adjustable heat conduction module, so that heat conduction is reduced, and condensation water generated by conduction to low temperature when the IPM module does not work is prevented.

Because the IPM intelligent power module of the existing fluorine pump circulation and compression refrigeration circulation composite system has the phenomenon that condensation is easy to form due to low-temperature cold energy conduction, and the heat dissipation control needs to be accurately controlled, so that the problem of temperature control failure is prevented. The invention provides a heat dissipation system of a power module, which solves the following technical problems:

1. the problem of condensation is easily formed by the fact that low-temperature liquid refrigerant in the fluorine pump mode conducts cold energy to the IPM intelligent power module through a pipeline;

2. The temperature of the IPM intelligent power module in the compression refrigeration mode cannot be precisely controlled, and the design of the cooling cycle is problematic.

The beneficial effects are as follows:

when the IPM module is not in operation or in a fluorine pump refrigerating mode, the control valve is closed, and the distance between the IPM module and the evaporating section of the heat pipe is adjusted to reduce heat conduction, so that heat transfer of the heat pipe is blocked, low-temperature cold is prevented from being conducted to the IPM module, and dew is prevented; the temperature sensor built in the IPM module is utilized to control the control valve, so that the accurate control of the temperature of the IPM module is realized, the occurrence of too low temperature or too high temperature is prevented, and the safe operation of the IPM module is ensured.

In some embodiments, the adjustable thermal conduction module 300 is further capable of reducing thermal heat transfer resistance, increasing or turning on heat exchange between the power module 200 and the evaporator section 1 when the fluorine pump air conditioning system is operating in a compression refrigeration mode;

the adjustable heat conduction module 300 is also capable of increasing heat transfer resistance when the fluorine pump air conditioning system is shut down, reducing or preventing heat exchange between the power module 200 and the evaporator section 1.

The heat transfer resistance is preferably reduced in the compression refrigeration mode, the heat of the power module can be transferred into the refrigerant of the fluorine pump air conditioner by utilizing the heat pipe system in the compression refrigeration mode, namely, the power module is refrigerated and cooled by utilizing the refrigerant of the fluorine pump air conditioner system; the heat transfer resistance is increased when the fluorine pump air conditioning system is stopped, the refrigerant does not flow circularly because the fluorine pump air conditioning system does not work when the fluorine pump air conditioning system is stopped, and the heat pipe system cannot convey the cold to the power module to cool the power module, so that the heat transfer resistance of the adjustable heat conduction module is increased at the moment, the heat exchange between the power module and the evaporation section of the heat pipe system can be reduced, and therefore, the power module and the heat pipe system are prevented from generating unnecessary heat exchange (for example, the power module is heated by the heat pipe system, and the like), and the power module is ensured to be normal.

In some embodiments, the adjustable heat conduction module 300 includes a first housing 17 and a second housing 18, one end of the first housing 17 is connected to the evaporation section 1, the other end of the first housing 17 is connectable to the second housing 18, one end of the second housing 18 far away from the first housing 17 is connected to the power module 200, the first housing 17 and the second housing 18 can move relatively, and a heat conduction material 19 is disposed inside the first housing 17 and/or the second housing 18, and the heat conduction coefficient of the heat conduction material 19 is greater than the heat conduction coefficient of the first housing 17 and the heat conduction coefficient of the second housing 18, respectively; when the fluorine pump air conditioning system is operated in a fluorine pump cooling mode or is shut down, the first housing 17 and the second housing 18 move in opposite directions; when the fluorine pump air conditioning system is operated in the compression refrigeration mode, the first housing 17 and the second housing 18 move toward each other.

This is a preferred structural form of the adjustable heat conduction module of the present invention, the first shell is connected to the evaporation section through the first and second shells capable of relative movement, the second shell is connected to the power module, preferably the IPM module is not moved, the first shell moves towards the second shell, the first and/or second shells are internally provided with heat conduction materials, the heat conduction coefficient of the heat conduction materials is greater than that of the first and second shells, the heat conduction materials can be filled in the first and second shells through the opposite movement of the first and second shells so as to increase the heat transfer rate, the heat transfer thermal resistance is reduced, and the heat conduction materials are not filled in the first and second shells through the opposite movement of the first and second shells so as to reduce the heat transfer rate and increase the heat transfer thermal resistance; the first shell and the second shell can be moved oppositely in a fluorine pump refrigeration mode and a shutdown mode, so that the thermal resistance is increased, heat exchange between the evaporation section and the power module is avoided as much as possible, and condensation is avoided in the fluorine pump refrigeration mode; and the first shell and the second shell are moved in opposite directions in the compression mode, so that the thermal resistance can be reduced, the heat transfer rate can be improved, the cooling effect on the power module can be enhanced, and the heat dissipation performance can be improved.

In some embodiments, when the first housing 17 and the second housing 18 move toward each other, the first housing 17 may be sleeved on the outer periphery of the second housing 18 or the second housing 18 may be sleeved on the outer periphery of the first housing 17, and when the first housing 17 and the second housing 18 move away from each other, the first housing 17 is gradually separated from the sleeve connection with the second housing 18. The invention further preferably adopts a sleeved structure form between the first shell and the second shell, so that the first shell and the second shell form sleeved connection when the first shell and the second shell move in opposite directions, the heat conducting material is filled in the shells, and the first shell and the second shell are separated from sleeved connection or are partially separated from sleeved connection when the first shell and the second shell move in opposite directions, so that the heat conducting material is dispersed, and the heat resistance is increased.

As shown in fig. 2, there is an adjustable heat conduction module 300 between the IPM module and the evaporation section, mainly composed of a lower housing (i.e. the second housing 18), an upper housing (i.e. the first housing 17), and a heat conduction material 19 filled in the two housings, such as heat conduction silicone grease; the upper shell and the lower shell are made of plastic and other materials with poor heat conduction performance, the upper shell is connected with the evaporation section in a sealing way, and the lower shell is connected with the heat dissipation plate of the IPM module in a sealing way; the upper shell and the lower shell can mutually move and keep sealing, and the heat conducting material is not leaked; the evaporation section or the IPM module is provided with a driving mechanism, and the displacement relation between the upper shell and the lower shell can be adjusted when the driving mechanism acts, so that the heat conduction material in the shell fills the inner space of the shell or does not fill the inner space of the shell, and when the heat conduction material does not fill the inner space of the shell, the heat conduction effect between the evaporation section and the heat dissipation plate of the IPM module is reduced.

In some embodiments, the adjustable thermal conduction module 300 further comprises a drive mechanism 20, the drive mechanism 20 being capable of driving the first housing 17 to move toward or away from the second housing 18; the heat conducting material 19 is heat conducting silicone grease, and the materials of the first shell 17 and the second shell 18 are plastics; a limiting structure is arranged between the first shell 17 and the second shell 18, so that the first shell 17 and the second shell 18 are not completely disconnected when moving away from each other.

The invention can further effectively drive the first shell and the second shell to move in opposite directions or in opposite directions through the driving mechanism, thereby completing the effect of increasing or reducing the thermal resistance under different operation modes; the heat conducting material is preferably heat conducting silicone grease which is made of plastic materials and is larger than that of the first shell and the second shell, and the heat transfer rate can be increased by filling the heat conducting material into the shells, so that the heat dissipation effect on the power module is improved; the two shells are connected with each other and are provided with limiting structures, so that the two shells can be effectively prevented from falling off.

In some embodiments, the heat pipe system 100 further includes a first pipe 3, a second pipe 4, and a control valve 5, where the first pipe 3 is connected between one end of the evaporation section 1 and one end of the condensation section 2, the second pipe 4 is connected between the other end of the evaporation section 1 and the other end of the condensation section 2, and the control valve 5 is disposed on the first pipe 3 and/or the second pipe 4. The heat pipe system is a preferable structural form, the condensation section and the evaporation section can be effectively connected into a whole through the first pipeline and the second pipeline, and the on-off of the pipeline or the flow rate can be controlled through the control valve.

The separated heat pipe system is connected with the IPM intelligent power module radiating plate and the low-temperature or normal-temperature refrigerant pipeline of the fluorine pump air conditioner, and the cold quantity of the low-temperature or normal-temperature refrigerant is conducted to the IPM intelligent power module radiating plate, so that the IPM module is cooled; the control valve is arranged on the pipe section of the separated heat pipe, and the temperature detected by the built-in temperature sensor of the IPM module is used for controlling the control valve, so that the accurate control of heat dissipation of the IPM module is realized.

The working principle of the heat pipe system is as follows: the low-temperature heat transfer working medium in the evaporation section absorbs heat and evaporates to gasify into gas, and the heat emitted by the IPM module is taken away by the gasification heat absorption of the low-temperature heat transfer working medium in the evaporation section; the heat transfer working medium gas rises into the condensation section to be subjected to heat exchange with the low-temperature refrigerant on the other side to be condensed and liquefied into low-temperature liquid, and the liquid flows to the evaporation section at the lower part under the action of gravity, so that a complete heat pipe refrigeration cycle is completed. When the control valve is closed, the refrigerant of the heat pipe system cannot circulate, and the heat pipe system cannot complete the refrigeration cycle.

In some embodiments, the first pipe 3 and the second pipe 4 are both heat-insulating pipes, the control valve 5 is a solenoid valve capable of controlling closing of the pipes, or the control valve 5 is an electronic expansion valve capable of controlling flow rate size change; refrigerant is introduced into the first pipeline 3 and the second pipeline 4, and the refrigerant are the same or different substances. The two pipelines are preferably heat-insulating pipelines, so that heat exchange between the refrigerant in the pipelines and the outside can be reduced, and the respective heat exchange effects of the condensing section and the evaporating section are enhanced; the control valve can be preferably an electromagnetic valve to control on-off, and can also be preferably an electronic expansion valve to control the flow; the refrigerant in the heat pipe system may be the same refrigerant as in the fluorine pump air conditioning system or a different refrigerant.

The refrigerant in the air conditioning system of the invention is completely isolated from the heat transfer working medium (i.e. refrigerant) in the heat pipe system, belongs to two different closed cycles, and may not be the same type of refrigerant.

As shown in fig. 1, a heat exchange tube is arranged in the liquid storage tank to serve as a condensation section of the heat pipe system, and the refrigerant gas in the condensation section and the refrigerant liquid in the liquid storage tank are subjected to heat exchange through the heat exchange tube and condensed into low-temperature liquid to return to an evaporation section of the heat pipe system again. The connecting pipeline of the heat pipe system is provided with a control valve for controlling the on-off of the heat pipe system or regulating the flow of the refrigerant in the heat pipe, so that the refrigerating capacity of the evaporation section can be controlled to adapt to the heat emitted by the IPM module; the control valve may be a solenoid valve, an electronic expansion valve, or the like.

The heat dissipation plate of the IPM intelligent power module is connected with the evaporation section of the heat pipe through the adjustable heat conduction module, the condensation section of the heat pipe is arranged on a pipeline between the outlet of the condenser and the air suction port of the compressor, the condensation section exchanges heat with the refrigerant in the pipeline of the fluorine pump air conditioner, and the heat transfer working medium in the condensation section is cooled and condensed; the heat-insulating section of the heat pipe comprises at least one heat-insulating pipe, on which the heat-transfer medium of the heat pipe flows, and may also comprise a gas pipe and a liquid pipe, on which a control valve is arranged.

In some embodiments, the power module 200 is provided with a temperature sensor, the control valve 5 can control the flow rate of the refrigerant according to the temperature of the power module 200, when the temperature of the power module 200 increases, the control valve 5 is controlled to increase the opening degree, when the temperature of the power module 200 decreases, the control valve 5 is controlled to decrease the opening degree, and when the power module 200 does not operate, the control valve 5 is closed.

The temperature sensor is arranged on the power module, the control valve is arranged on the heat pipe system, and the temperature of the power module detected by the temperature sensor is used for controlling the control valve, so that the accurate control of the temperature of the power module is realized, the condition that the temperature of the power module is too low or too high is prevented, and the safe and reliable operation of the power module is ensured; when the IPM module does not work, the control valve is closed, and the distance between the IPM module and the evaporation section of the heat pipe is adjusted to reduce heat conduction, so that heat transfer of the heat pipe is blocked, low-temperature cold energy is prevented from being conducted to the IPM module, and therefore dew is prevented.

In some embodiments, the power module 200 is not operated when the fluorine pump air conditioning system is operating in a fluorine pump cooling mode or in a shutdown state; when the fluorine pump air conditioning system is operated in the compression refrigeration mode, the control valve 5 is opened and controls the flow rate of the refrigerant according to the temperature of the power module 200. The invention is a specific situation and form that the power module does not work or works, under the fluorine pump refrigeration mode, heat is generated due to the fact that the power module works, but condensation is generated on the power module if the heat is exchanged with the heat pipe system, so that the power module is controlled to not work at the moment, and the power module does not work under the stop state of the fluorine pump air conditioning system, so that the heat generated by work is prevented from being unable to be dissipated; the power module only works in the compression refrigeration mode, and the control valve is opened to transfer the cold energy in the fluorine pump air conditioning system to the power module by using the heat pipe system so as to cool the power module.

In some embodiments, the fluorine pump air conditioning system comprises a compressor 6 and a condenser 7, the condensing section 2 is disposed at a position between the outlet of the condenser 7 and the suction port of the compressor 6 to exchange heat with a pipe or component between the outlet of the condenser 7 and the suction port of the compressor 6. The condensing section is arranged at a preferable position in the fluorine pump air conditioning system, and the condensing section is arranged between the outlet of the condenser and the air suction port of the compressor, so that part of refrigerant (the refrigerant after heat release of the condenser has a certain amount of cold energy) can be effectively utilized to absorb heat in the condensing section, and the aim of refrigerating and cooling the power module is fulfilled.

In some embodiments, the fluorine pump air conditioning system further comprises a liquid storage tank 8 and a fluorine pump 9, wherein the liquid storage tank 8 is arranged between the outlet of the condenser 7 and the fluorine pump 9, and the condensation section 2 is arranged inside the liquid storage tank 8 so as to exchange heat with the refrigerant in the liquid storage tank 8. The fluorine pump air conditioning system also preferably comprises a liquid storage tank arranged between the condenser and the fluorine pump, wherein the liquid storage tank is used for carrying out gas-liquid separation, so that separated liquid refrigerant enters the evaporator through the fluorine pump to exchange heat, and the evaporation heat exchange efficiency is improved; the condensing section is preferably arranged in the liquid storage tank, and is further preferably arranged in liquid refrigerant in the liquid storage tank, so that the refrigerating and cooling effects of the condensing section are further improved, and the refrigerating and cooling effects of the power module are further enhanced.

In some embodiments, the fluorine pump air conditioning system further comprises an evaporator 10, a throttle valve 11, a check valve a12, a check valve B13, a gas-liquid separator 14, an inner fan 15 and an outer fan 16, wherein the air suction port of the compressor 6 is communicated with the gas-liquid separator 14, the check valve B13 is arranged at two ends of the compressor 6 after being communicated with the gas-liquid separator 14 in series in parallel, the check valve a12 is arranged at two ends of the fluorine pump 9 in parallel, the throttle valve 11 is arranged between the fluorine pump 9 and the evaporator 10, the inner fan 15 blows or sucks air to the evaporator 10, and the outer fan 16 blows or sucks air to the condenser 7. The fluorine pump air conditioning system further comprises an evaporator, a throttle valve and other structures, and can execute a compression refrigeration mode by opening the one-way valve A and closing the one-way valve B so as to short-circuit the fluorine pump; and the check valve B is opened and the check valve A is simultaneously opened, so that the compressor is short-circuited, and the fluorine pump refrigeration mode is executed.

As shown in fig. 1, the fluorine pump air conditioning unit is formed by sequentially connecting a compressor, a condenser, a liquid storage tank, a fluorine pump, a throttle valve, an evaporator and a gas-liquid separator, wherein a one-way valve A is connected in parallel with the fluorine pump, and the flow direction of the one-way valve A only allows an inlet of the fluorine pump to point to an outlet of the fluorine pump; the check valve B bypasses the compressor in parallel, and the flow direction of the check valve B only allows the inlet of the compressor to be directed to the outlet of the compressor.

a control step of controlling the adjustable heat conduction module 300 to increase heat transfer resistance when the fluorine pump air conditioning system is judged to be in a shutdown state; when the operation mode of the fluorine pump air conditioning system is judged to be the fluorine pump refrigeration mode, controlling the adjustable heat conduction module 300 to increase heat transfer resistance; when the operation of the fluorine pump air conditioning system is judged and the operation mode is the compression refrigeration mode, the adjustable heat conduction module 300 is controlled to reduce the heat transfer resistance.

According to the control method, the heat transfer resistance can be selectively increased or reduced according to different modes or shutdown states of the fluorine pump air conditioning system, and particularly, the adjustable heat conduction module is selectively controlled to increase the heat transfer resistance in the fluorine pump refrigeration mode, so that heat exchange between the power module and the evaporation section is reduced or prevented, condensation phenomenon formed at the power module due to low-temperature cold energy conduction is further effectively prevented, and the problem of safety is avoided; the heat pipe and the IPM module are separated through the adjustable heat conduction module, so that condensation is prevented from being generated by conduction to low temperature when the IPM module does not work; the distance between the heat pipe evaporation section and the IPM module is adjusted through the adjustable heat conduction module, so that heat conduction is reduced, condensation water generated by conduction to low temperature when the IPM module does not work is prevented, and the safety performance of the IPM module is improved.

In some embodiments, when the adjustable thermally conductive module 300 includes a first housing 17 and a second housing 18, and the first housing 17 and/or the second housing 18 are internally provided with a thermally conductive material 19:

a control step of controlling the first casing 17 and the second casing 18 to move in opposition to each other so that the heat conductive material does not fill the internal space surrounded by the first casing 17 and the second casing 18 when the fluorine pump air conditioning system is judged to be in a stopped state; when the operation mode of the fluorine pump air conditioning system is judged to be a fluorine pump refrigeration mode, the first shell 17 and the second shell 18 are controlled to move oppositely so that the heat conducting material is not filled in the inner space enclosed by the first shell 17 and the second shell 18; when the operation mode of the fluorine pump air conditioning system is judged to be the compression refrigeration mode, the first shell 17 and the second shell 18 are controlled to move in opposite directions so that the heat conducting material fills the inner space enclosed by the first shell 17 and the second shell 18.

This is a further preferred form of the adjustable heat conduction module 300 of the present invention comprising a first housing 17 and a second housing 18, and a control method when the first housing 17 and/or the second housing 18 are provided with a heat conduction material 19 inside, i.e. the two housings are controlled to move back to back in a shutdown or fluorine pump cooling mode, so that the heat conduction material is dispersed in the housings and does not fill the space of the housings, thereby increasing heat transfer resistance and preventing condensation of the power module; and in the compression refrigeration mode, the two shells are controlled to move in opposite directions, so that the heat conduction material fills the space inside the shells as much as possible, thereby increasing the heat transfer rate, reducing the thermal resistance and increasing the heat dissipation efficiency of the power module.

In some embodiments, when the heat pipe system 100 further includes a first pipe 3, a second pipe 4, and a control valve 5, and the power module 200 is provided with a temperature sensor thereon:

in the control step, when the fluorine pump air conditioning system is judged to be in a stop state, the control valve 5 is controlled to be closed; and when the operation mode of the fluorine pump air conditioning system is judged to be the fluorine pump refrigerating mode, the control valve 5 is controlled to be closed.

The control method of the invention also preferably controls the control valve to be closed when the heat pipe system comprises a first pipeline, a second pipeline, a control valve and a temperature sensor, so that the heat pipe system does not operate and heat exchange to the power module is closed; and in the fluorine pump refrigeration mode, the control valve is also closed to close the heat pipe system, and the heat exchange of the power module is also closed to prevent the condensation phenomenon generated during the heat exchange of the power module.

the control method further includes a detecting step of detecting a temperature of the power module 200 by the temperature sensor;

the judging step judges whether the temperature of the power module 200 is lower than a preset temperature;

The control step of controlling the opening degree of the control valve 5 to be reduced when the temperature of the power module 200 is lower than the preset temperature; when the temperature of the power module 200 is higher than the preset temperature, the opening degree of the control valve 5 is controlled to be increased.

The method is a preferable control step of the control valve of the fluorine pump air conditioning system in the compression refrigeration mode, and the opening degree of the control valve is reduced when the temperature of the power module is lower than the preset temperature so as to reduce the heat exchange amount of the power module, save energy and increase efficiency; and when the temperature of the power module is higher than the preset temperature, the opening degree of the control valve is increased so as to increase the heat exchange efficiency of the power module and accelerate the cooling of the power module, so that the power module is below the normal working temperature.

The working principle of the heat pipe system is as follows:

1) In the compression refrigeration mode, the driving mechanism acts to enable the upper shell and the lower shell to be close to each other until the heat conducting material fills the space inside the shell, so that good heat conduction is kept between the evaporation section and the heat dissipation plate of the IPM module. The heat productivity of the IPM intelligent power module is fluctuated due to the change of the operation condition and/or the control requirement, and the cooling capacity supplied by the heat pipe system is determined to be matched and changed according to the temperature of the IPM module obtained by a temperature sensor arranged in the module; the control valve is a key part for providing cold change adjustment for the heat pipe system, when the temperature of the module rises, the opening of the control valve is increased, otherwise, the opening of the control valve is reduced; when the IPM intelligent power module is not in operation (no heat is dissipated at this time, for example, in a fluorine pump refrigeration mode or in a shutdown state), the control valve is closed, and the driving mechanism acts to keep the upper casing and the lower casing away from each other, so that the heat conducting material does not fill the internal space of the casing.

2) In the fluorine pump refrigeration mode, the temperature of the liquid refrigerant returned by the outdoor condenser is very low, the low-temperature refrigerant is driven by the fluorine pump to enter the evaporator to absorb heat, evaporate and gasify to become low-temperature low-pressure refrigerant gas, and the low-temperature low-pressure refrigerant gas enters the condenser through the one-way valve B to be condensed and liquefied to become low-temperature liquid, so that a finished fluorine pump refrigeration cycle is formed. The cold energy of the low-temperature refrigerant is conducted to the condensation section of the heat pipe system through the refrigerant pipeline and the refrigerant, and then is transferred to the heat dissipation plate of the IPM module through the heat pipe system, so that the IPM intelligent power module and parts nearby the IPM intelligent power module can be slowly cooled. When the IPM module and its contacting components are at a temperature below the dew point of the air in its vicinity, condensation water will be generated on these surfaces, which is a serious threat to the safety of the controller. Under the condition, the control valve of the heat pipe radiating system is closed, so that the conduction of cold energy to the IPM module is reduced, meanwhile, the driving mechanism acts to enable the upper shell and the lower shell to be far away from each other, so that the heat conducting material does not fill the inner space of the shell, and the conduction effect of the cold energy is reduced.

The refrigerant cycle in the compression refrigeration mode of fig. 1 is: compressor, condenser, liquid storage tank, one-way valve A, throttle valve, evaporator, gas-liquid separator and compressor. In this mode, the outlet of the check valve B is a high-temperature and high-pressure refrigerant, and at this time, the check valve B cannot be turned on, and belongs to a reverse high-pressure cut-off closing state.

The refrigerant cycle in the fluorine pump cooling mode in fig. 1 is: fluorine pump, throttle valve, evaporator, one-way valve B, condenser, liquid storage tank and fluorine pump. In this mode the fluoride pump outlet pressure is higher and the non-return valve a is in a reverse high pressure shut-off condition.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.

Claims

1. A heat dissipation system for a power module, comprising: comprising the following steps:

fluorine pump air conditioning system, heat pipe system (100), power module (200) and adjustable heat conduction module (300), heat pipe system (100) include evaporation zone (1) and condensation segment (2), condensation segment (2) can with refrigerant heat transfer in the fluorine pump air conditioning system is in order to give the heat release to refrigerant, evaporation zone (1) can with power module (200) heat transfer in order to right power module (200) carries out the endothermic cooling, adjustable heat conduction module (300) set up in evaporation zone (1) with between power module (200), adjustable heat conduction module (300) can increase thermal resistance in fluorine pump air conditioning system operation under the fluorine pump refrigeration mode, reduce or prevent heat transfer between power module (200) and evaporation zone (1).

2. The heat dissipation system of a power module of claim 1, wherein:

the adjustable heat conduction module (300) can also reduce heat transfer resistance and increase or start heat exchange between the power module (200) and the evaporation section (1) when the fluorine pump air conditioning system is operated in a compression refrigeration mode;

the adjustable heat conduction module (300) can also increase heat transfer resistance when the fluorine pump air conditioning system is stopped, and reduce or prevent heat exchange between the power module (200) and the evaporation section (1).

3. The heat dissipation system of a power module of claim 2, wherein:

the adjustable heat conduction module (300) comprises a first shell (17) and a second shell (18), one end of the first shell (17) is connected with the evaporation section (1), the other end of the first shell (17) can be connected with the second shell (18), one end, far away from the first shell (17), of the second shell (18) is connected with the power module (200), the first shell (17) and the second shell (18) can move relatively, and heat conduction materials (19) are arranged in the first shell (17) and/or the second shell (18), and the heat conduction coefficients of the heat conduction materials (19) are respectively larger than those of the first shell (17) and the second shell (18); -when the fluorine pump air conditioning system is operated in a fluorine pump cooling mode or is shut down, the first housing (17) and the second housing (18) move in opposite directions; when the fluorine pump air conditioning system is operated in a compression refrigeration mode, the first shell (17) and the second shell (18) move towards each other.

4. A heat dissipation system for a power module as recited in claim 3, wherein:

when the first shell (17) and the second shell (18) move in opposite directions, the first shell (17) can be sleeved on the periphery of the second shell (18) or the second shell (18) can be sleeved on the periphery of the first shell (17), and when the first shell (17) and the second shell (18) move in opposite directions, the first shell (17) is gradually separated from the sleeve joint between the second shell (18).

5. A heat dissipation system for a power module as recited in claim 3, wherein:

the adjustable heat conduction module (300) further comprises a driving mechanism (20), and the driving mechanism (20) can drive the first shell (17) and the second shell (18) to move towards each other or move away from each other; the heat conducting material (19) is heat conducting silicone grease, and the materials of the first shell (17) and the second shell (18) are plastics; a limiting structure is arranged between the first shell (17) and the second shell (18) so that the first shell (17) and the second shell (18) are not completely disconnected when moving oppositely.

6. The heat dissipation system of a power module of any one of claims 1-5, wherein:

The heat pipe system (100) further comprises a first pipeline (3), a second pipeline (4) and a control valve (5), wherein the first pipeline (3) is communicated between one end of the evaporation section (1) and one end of the condensation section (2), the second pipeline (4) is communicated between the other end of the evaporation section (1) and the other end of the condensation section (2), and the control valve (5) is arranged on the first pipeline (3) and/or the second pipeline (4).

7. The heat dissipation system of a power module of claim 6, wherein:

the first pipeline (3) and the second pipeline (4) are heat-insulating pipelines, the control valve (5) is an electromagnetic valve capable of controlling the closing of the pipelines, or the control valve (5) is an electronic expansion valve capable of controlling the change of flow; refrigerant is introduced into the first pipeline (3) and the second pipeline (4), and the refrigerant are the same or different substances.

8. The heat dissipation system of a power module of claim 6, wherein:

the power module (200) is provided with a temperature sensor, the control valve (5) can control the flow rate of the refrigerant according to the temperature of the power module (200), when the temperature of the power module (200) rises, the control valve (5) is controlled to increase the opening degree, when the temperature of the power module (200) drops, the control valve (5) is controlled to reduce the opening degree, and when the power module (200) does not work, the control valve (5) is closed.

9. The heat dissipation system of a power module of claim 8, wherein:

when the fluorine pump air conditioning system is operated in a fluorine pump refrigeration mode or a shutdown state, the power module (200) does not work; when the fluorine pump air conditioning system operates in a compression refrigeration mode, the control valve (5) is opened and controls the flow of the refrigerant according to the temperature of the power module (200).

10. The heat dissipation system of a power module of any one of claims 1-9, wherein:

the fluorine pump air conditioning system comprises a compressor (6) and a condenser (7), wherein the condensing section (2) is arranged at a position between an outlet of the condenser (7) and an air suction port of the compressor (6) so as to exchange heat with a pipeline or a part between the outlet of the condenser (7) and the air suction port of the compressor (6).

11. The heat dissipation system of a power module of claim 10, wherein:

the fluorine pump air conditioning system further comprises a liquid storage tank (8) and a fluorine pump (9), wherein the liquid storage tank (8) is arranged between an outlet of the condenser (7) and the fluorine pump (9), and the condensation section (2) is arranged in the liquid storage tank (8) so as to exchange heat with the refrigerant in the liquid storage tank (8).

12. The heat dissipation system of a power module of claim 11, wherein:

the fluorine pump air conditioning system further comprises an evaporator (10), a throttle valve (11), a one-way valve A (12), a one-way valve B (13), a gas-liquid separator (14), an inner fan (15) and an outer fan (16), wherein an air suction port of the compressor (6) is communicated with the gas-liquid separator (14), the one-way valve B (13) is arranged in parallel at two ends of the compressor (6) after being communicated with the gas-liquid separator (14) in series, the one-way valve A (12) is arranged at two ends of the fluorine pump (9) in parallel, the throttle valve (11) is arranged between the fluorine pump (9) and the evaporator (10), the inner fan (15) is used for blowing or sucking air of the evaporator (10), and the outer fan (16) is used for blowing or sucking air of the condenser (7).

13. A control method of a heat dissipation system of a power module according to any one of claims 1 to 12, characterized by: comprising the following steps:

a control step of controlling the adjustable heat conduction module (300) to increase heat transfer resistance when the fluorine pump air conditioning system is judged to be in a shutdown state; when the operation mode of the fluorine pump air conditioning system is judged to be a fluorine pump refrigeration mode, controlling the adjustable heat conduction module (300) to increase heat transfer resistance; and when the operation mode of the fluorine pump air conditioning system is judged to be the compression refrigeration mode, controlling the adjustable heat conduction module (300) to reduce heat transfer resistance.

14. The control method according to claim 13, characterized in that:

when the adjustable heat conduction module (300) comprises a first housing (17) and a second housing (18), and the first housing (17) and/or the second housing (18) are internally provided with a heat conduction material (19):

a control step of controlling the first housing (17) and the second housing (18) to move in opposition to each other so that a heat conductive material does not fill an internal space surrounded by the first housing (17) and the second housing (18) when it is determined that the fluorine pump air conditioning system is in a stopped state; when the operation mode of the fluorine pump air conditioning system is judged to be a fluorine pump refrigerating mode, the first shell (17) and the second shell (18) are controlled to move oppositely so that the heat conducting material is not filled in an inner space surrounded by the first shell (17) and the second shell (18); when the operation mode of the fluorine pump air conditioning system is judged to be a compression refrigeration mode, the first shell (17) and the second shell (18) are controlled to move oppositely so that the heat conducting material fills the inner space surrounded by the first shell (17) and the second shell (18).

15. The control method according to claim 13, characterized in that:

When the heat pipe system (100) further comprises a first pipe (3), a second pipe (4) and a control valve (5), and the power module (200) is provided with a temperature sensor:

in the control step, when the fluorine pump air conditioning system is judged to be in a stop state, the control valve (5) is controlled to be closed; and when the operation mode of the fluorine pump air conditioning system is judged to be the fluorine pump refrigerating mode, the control valve (5) is controlled to be closed.

16. The control method according to claim 15, characterized in that:

when the operation mode of the fluorine pump air conditioning system is judged to be a compression refrigeration mode:

the control method further includes a detection step of detecting a temperature of the power module (200) by the temperature sensor;

the judging step judges whether the temperature of the power module (200) is lower than a preset temperature;

the control step of controlling the opening degree of the control valve (5) to be reduced when the temperature of the power module (200) is lower than the preset temperature; when the temperature of the power module (200) is higher than the preset temperature, the opening degree of the control valve (5) is controlled to be increased.