A heat exchange system for a power module and its control method

Abstract

The present invention provides a heat exchange system for a power module and a control method thereof. The heat exchange system for the power module includes: a refrigeration system, an isolated heat exchange system, and a power module. The refrigeration system includes an evaporator. The isolated heat exchange system is a circulating pipeline system isolated from the refrigeration system. The isolated heat exchange system includes a heat dissipation device. The power module is disposed in the isolated heat exchange system, and the power module is communicated with the heat dissipation device through a pipeline. The heat dissipation device is disposed on the air outlet path of the evaporator, that is, the heat dissipation device can exchange heat with the air after heat exchange through the evaporator. According to the present invention, the physical isolation between the power module and the refrigeration system is effectively achieved, and the cold quantity of the outdoor cold air is prevented from being conducted to the IPM intelligent power module through the refrigeration system, thereby avoiding the condensation phenomenon around the IPM intelligent power module.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to a heat exchange system for a power module and a control method thereof. Background Art

[0002] With the large-scale application of 4G and the gradual popularization of 5G, the heat generation of various data processing devices is increasing, and the requirements for the cooling capacity and energy saving of air conditioning equipment in data centers are also getting higher and higher.

[0003] Using the outdoor natural cold source in the transitional season and cold winter to cool the data center can greatly reduce the operating cost of air conditioning equipment. Commonly, a fluorine pump air conditioner is used. In winter, the fluorine pump mode is enabled, and the operation of the compressor is stopped. The refrigerant is driven by the fluorine pump to achieve heat pipe refrigeration operation, which greatly reduces the operating cost of the equipment.

[0004] Due to the changes in the heat load of the data center and the outdoor ambient temperature, the cooling capacity output of the air conditioner in the data center computer room needs to be intelligently adjusted and controlled accordingly to meet the requirements of the data center for air conditioning with constant temperature and humidity. Currently, most of the mainstream variable-capacity output refrigeration systems adopt frequency conversion control, such as using variable-frequency compressors, DC speed-regulating fans, etc.

[0005] The variable-frequency compression refrigeration cycle system combined with a fluorine pump cycle usually has an IPM intelligent power module with a relatively large heat generation. As the heat generation of the intelligent power module increases, the requirements for its heat dissipation system are also getting higher and higher. The lateral heat diffusion performance of the intelligent power module on the market is poor, and the heat capacity is small. When the power chip (such as an IGBT chip, an FRD chip, or a MOS chip, etc.) starts to work instantaneously, it will generate a large amount of heat, which will cause the temperature of the IGBT chip, the FRD chip, or the MOS chip to increase suddenly and damage the power chip. The heat generation of the intelligent power module often changes, but in many cases, the cooling fluid is not accurately controlled during the design, resulting in a relatively large fluctuation in the working temperature of the intelligent power module, and it is easy to have over-temperature or the surface temperature is lower than the air dew point temperature. When the surface temperature is lower than the air dew point temperature, it is easy to form condensed water on the surface of the radiator, which poses a serious safety threat to the controller.

[0006] Since the power consumption of the fluorine pump cycle is much smaller than that of the compression refrigeration cycle, the heat generation of the power module is also relatively small. Correspondingly, the flow rate of the cooling fluid of the power module can be much smaller; even when the fluorine pump cycle is in operation, the power module does not participate in the operation, that is, no cooling is required. However, when the outdoor ambient temperature is very low, the temperature of the outdoor liquid refrigerant sucked by the fluorine pump is very low, and the low temperature is easily conducted to the radiator of the IPM intelligent power module through copper pipes, etc., and then condensation occurs.

[0007] Currently, the refrigerant circulation liquid cooling scheme of the refrigeration system is usually adopted to cool down the IPM intelligent power module. However, in the fluorine pump computer room air conditioner unit, when the computer room air conditioner placed in the outdoor low-temperature environment stops running, it is easy to conduct the cold quantity of the outdoor cold air to the heat dissipation plate of the IPM intelligent power module through the copper pipe, and then condensation may occur around it. The existence of condensed water is a very dangerous factor for the startup and operation of the computer room air conditioner.

[0008] To sum up, computer room air conditioners, especially fluorine pump computer room air conditioners, need to prevent low-temperature conduction from forming condensation on the IPM intelligent power module and avoid electrical safety problems.

[0009] Due to technical problems such as the low-temperature conduction in the existing computer room air conditioners, especially fluorine pump computer room air conditioners, forming condensation on the IPM intelligent power module, and / or the problem of relatively high air conditioner energy consumption, the present invention researches and designs a heat exchange system for a power module and its control method. Summary of the Invention

[0010] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the existing computer room air conditioners have low-temperature conduction forming condensation on the IPM intelligent power module, so as to provide a heat exchange system for a power module and its control method.

[0011] To solve the above problems, the present invention provides a heat exchange system for a power module, which includes:

[0012] A refrigeration system, an isolation heat exchange system, and a power module. The refrigeration system includes an evaporator. The isolation heat exchange system is a circulating pipeline system isolated from the refrigeration system. The isolation heat exchange system includes a heat dissipation device. The power module is arranged in the isolation heat exchange system, and the power module is communicated with the heat dissipation device through a pipeline. The heat dissipation device is arranged on the air outlet path of the evaporator, that is, the heat dissipation device can exchange heat with the air after heat exchange through the evaporator.

[0013] In some embodiments, the isolation heat exchange system includes a water pump, a first pipeline, and a second pipeline. One end of the first pipeline can be communicated with one end of the power module, the other end of the first pipeline can be communicated with one end of the heat dissipation device, one end of the second pipeline can be communicated with the other end of the power module, the other end of the second pipeline can be communicated with one end of the heat dissipation device, and the water pump is arranged on the first pipeline or the second pipeline.

[0014] In some embodiments, the isolation heat exchange system further includes a make-up water pipe and a water stop valve. The water pump is disposed on the first pipeline. One end of the make-up water pipe communicates with the first pipeline, and the other end is capable of introducing external water. The water stop valve is disposed on the make-up water pipe to only allow water to flow toward the first pipeline.

[0015] In some embodiments, the isolation heat exchange system further includes a humidifier, a third pipeline, a fourth pipeline, and a humidifying pipe. One end of the third pipeline communicates with the second pipeline, and the other end communicates with the interior of the humidifier. One end of the fourth pipeline communicates with the interior of the humidifier to draw out condensed water and / or water vapor from the humidifier. The other end of the fourth pipeline communicates with the humidifying pipe. The humidifying pipe is disposed on the air outlet pipeline of the evaporator to humidify the air cooled by the evaporator. A water replenishing valve is disposed on the third pipeline.

[0016] In some embodiments, along the air flow direction, the humidifying pipe is disposed on the downstream side of the air outlet path of the heat dissipation device, that is, the heat dissipation device is disposed between the evaporator and the humidifying pipe.

[0017] In some embodiments, the isolation heat exchange system further includes an overflow pipe. One end of the overflow pipe communicates with the interior of the humidifier, and the other end penetrates out of the humidifier.

[0018] In some embodiments, the humidifying pipe is a hollow pipe structure with an internal accommodation cavity, and a plurality of through holes are formed in its pipe wall. The through holes penetrate from the inner wall to the outer wall of the humidifying pipe, so that the condensed water and / or water vapor can be ejected through the through holes.

[0019] In some embodiments, the isolation heat exchange system further includes a bypass pipeline and a one-way valve. One end of the bypass pipeline communicates with the first pipeline and is located on the pipe segment between the water pump and the power module. The other end of the bypass pipeline communicates with the first pipeline and is located on the pipe segment between the water pump and the heat dissipation device. The one-way valve is disposed on the bypass pipeline and is in parallel with the water pump. The one-way valve only allows water to flow from the inlet end of the water pump to the outlet end of the water pump. The height of the heat dissipation device is higher than the height of the power module.

[0020] In some embodiments, the power module includes a heat dissipation part. One end of the first pipeline can communicate with one end of the heat dissipation part of the power module, and one end of the second pipeline can communicate with the other end of the heat dissipation part of the power module.

[0021] In some embodiments, the refrigeration system further includes a compressor, a condenser, and a throttle valve, and the power module is an IPM module.

[0022] The present invention also provides a control method for a heat exchange system of a power module as described above, which includes:

[0023] A detection step of detecting the air humidity in the room;

[0024] A judgment step of judging the relationship between the air humidity and a high preset humidity and a low preset humidity;

[0025] A control step of, when the air humidity in the room is lower than the low preset humidity, controlling the water replenishing valve to open so as to humidify the air on the air outlet side of the evaporator through the humidifier and the humidifying pipe, and controlling the water pump to open; when the air humidity in the room is higher than the high preset humidity, controlling the water replenishing valve to close so as to cut off the water from entering the humidifier, and controlling the water pump to open; wherein, the high preset humidity is greater than or equal to the low preset humidity.

[0026] In some embodiments, when the water replenishing valve is open and the humidifier and the humidifying pipe humidify the air on the air outlet side of the evaporator:

[0027] The detection step further detects the water level height in the humidifier;

[0028] The judgment step further judges the relationship between the water level height and a preset height;

[0029] The control step of, when the water level height is greater than the preset height, controlling the water replenishing valve to close, keeping the water pump open, and performing a closed circulation of the water pump, the power module and the heat dissipation device; when the water level height is less than or equal to the preset height, controlling the water replenishing valve to open, keeping the water pump open, and performing an open circulation of the water pump, the power module, the heat dissipation device and the humidifier.

[0030] A heat exchange system of a power module and its control method provided by the present invention have the following beneficial effects:

[0031] 1. The present invention provides an isolated heat exchange system isolated from the refrigeration system. The isolated heat exchange system includes a heat dissipation device capable of exchanging heat with the air of the evaporator in the refrigeration system, so that the air cooled by the evaporator cools the coolant in the isolated heat exchange system in the heat dissipation device, and then can dissipate heat from the power module, thereby achieving the purpose of cooling the power module. At the same time, due to the adoption of the isolated heat exchange system, the power module is not directly arranged on the refrigeration pipeline for cooling, effectively realizing the physical isolation between the power module and the refrigeration system, thus effectively avoiding and preventing the condensation of the power module caused by the low outdoor ambient temperature in the refrigeration pipeline, and avoiding the cold of the outdoor cold air being conducted to the IPM intelligent power module through the refrigeration system, thereby avoiding the condensation phenomenon around the IPM intelligent power module, and effectively solving the problem of condensation formed on the IPM intelligent power module due to low-temperature conduction in the computer room air conditioner.

[0032] 2. The present invention also adopts the structure of a humidifier, a third pipeline, and a humidifying pipe, which can further use the heat generated by the power module to act on the humidifier to humidify the water in the humidifier, that is, use the water in the humidifier to cool the power module, which can further prevent the condensation of the power module; and can recover the heat of the power module for humidification, effectively reducing the power consumption of the humidifier, coupling the heat dissipation device with the water replenishing system of the humidifier, thereby reducing the energy consumption of the heat exchange system and improving the energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic structural diagram of Embodiment 1 of the heat exchange system of the power module of the present invention;

[0034] Figure 2 is a schematic structural diagram of Embodiment 2 of the heat exchange system of the power module of the present invention.

[0035] The reference numerals are shown as:

[0036] 100, refrigeration system; 200, isolated heat exchange system; 1, power module; 2, evaporator; 3, heat dissipation device; 4, water pump; 5, make-up water pipe; 6, water stop valve; 7, humidifier; 8, humidifying pipe; 9, make-up water valve; 10, compressor; 11, condenser; 12, throttle valve; 13, check valve; 14, external fan; 15, internal fan; 101, first pipeline; 102, second pipeline; 103, third pipeline; 104, fourth pipeline; 105, overflow pipe; 106, bypass pipeline. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] As Figure 1-2 shown, the present invention provides a heat exchange system for a power module, which includes:

[0038] A refrigeration system 100, an isolated heat exchange system 200, and a power module 1 (preferably an IPM module, i.e., an intelligent power module). The refrigeration system 100 includes an evaporator 2. The isolated heat exchange system 200 is a circulating pipeline system isolated from the refrigeration system 100 (i.e., the isolated heat exchange system and the refrigeration system do not directly contact). The isolated heat exchange system 200 includes a heat dissipation device 3. The power module 1 is disposed in the isolated heat exchange system 200, and the power module 1 is communicated with the heat dissipation device 3 through a pipeline. The heat dissipation device 3 is disposed on the air outlet path of the evaporator 2, that is, the heat dissipation device 3 can exchange heat with the air after heat exchange through the evaporator 2. The heat dissipation device of the present invention is preferably a heat dissipation pipe, on which heat dissipation fins are provided.

[0039] By providing an isolated heat exchange system isolated from the refrigeration system, the isolated heat exchange system includes a heat dissipation device that can exchange heat with the air of the evaporator in the refrigeration system, so that the air cooled by the evaporator cools the coolant in the isolated heat exchange system in the heat dissipation device, and then can dissipate heat from the power module, so as to achieve the purpose of cooling the power module. At the same time, since the isolated heat exchange system is adopted, the power module is not directly arranged on the refrigeration pipeline for cooling, effectively realizing the physical isolation between the power module and the refrigeration system, thus effectively avoiding and preventing the condensation of the power module caused by the low outdoor ambient temperature in the refrigeration pipeline, avoiding the cold quantity of the outdoor cold air being conducted to the IPM intelligent power module through the refrigeration system, and thus avoiding the condensation phenomenon around the IPM intelligent power module, and effectively solving the problem of condensation formed on the IPM intelligent power module due to low-temperature conduction of the computer room air conditioner.

[0040] In some embodiments, the isolated heat exchange system 200 includes a water pump 4, a first pipeline 101, and a second pipeline 102. One end of the first pipeline 101 can be communicated with one end of the power module 1, the other end of the first pipeline 101 can be communicated with one end of the heat dissipation device 3, one end of the second pipeline 102 can be communicated with the other end of the power module 1, the other end of the second pipeline 102 can be communicated with one end of the heat dissipation device 3, and the water pump 4 is disposed on the first pipeline 101 or the second pipeline 102. This is the preferred structural form of the isolated heat exchange system of the present invention. Through the structures of the first pipeline and the second pipeline, the power module and the heat dissipation device can be effectively connected to a closed-loop circuit. The heat in the power module is cooled by the coolant in the pipeline to become hot water, and the hot water then flows to the heat dissipation device for heat dissipation, and the hot water is turned into cold water to complete the heat export. The cooled cold water can circulate back to the power module again to continue cooling the power module. The water pump is used to provide the power for the water circulation.

[0041] In some embodiments, the isolation heat exchange system 200 further includes a make-up water pipe 5 and a water stop valve 6. The water pump 4 is disposed on the first pipeline 101. One end of the make-up water pipe 5 is communicated with the first pipeline 101, and the other end can introduce external water. The water stop valve 6 is disposed on the make-up water pipe 5 to only allow water to flow towards the first pipeline 101. The isolation heat exchange system of the present invention preferably further includes a make-up water pipe and a water stop valve. Water can be introduced into the first pipeline from the outside (such as municipal water supply, etc.) through the make-up water pipe. The function of the water stop valve is to prevent the water in the first pipeline from flowing out into the make-up water pipe.

[0042] In some embodiments, the isolation heat exchange system 200 further includes a humidifier 7, a third pipeline 103, a fourth pipeline 104, and a humidifying pipe 8. One end of the third pipeline 103 is communicated with the second pipeline 102, and the other end is communicated to the inside of the humidifier 7. One end of the fourth pipeline 104 is communicated with the inside of the humidifier 7 to be able to draw out condensed water and / or water vapor from the humidifier 7. The other end of the fourth pipeline 104 is communicated with the humidifying pipe 8. The humidifying pipe 8 is disposed on the air outlet pipeline of the evaporator 2 to be able to humidify the air cooled by the evaporator 2. A make-up water valve 9 is disposed on the third pipeline 103. The isolation heat exchange system of the present invention preferably further includes a humidifier, third and fourth pipelines, and a humidifying pipe. It can introduce the hot water heated by the power module into the humidifier through the third pipeline to form misty water vapor, and then conduct it to the humidifying pipe through the fourth pipeline, so as to use hot water for humidification and humidify the air in the air outlet path of the evaporator, reducing the heating power consumption of the humidifier and improving the energy efficiency of the system.

[0043] With the above structure, the present invention not only uses the water of the humidifier to cool the power module, which can further prevent the condensation of the power module; but also can use the recovered heat of the power module for humidification, effectively reducing the power consumption of the humidifier, coupling the heat dissipation device with the make-up water system of the humidifier, thereby reducing the energy consumption of the heat exchange system and improving the energy efficiency.

[0044] The present invention uses a water pump to circulate and cool the IPM intelligent power module, and the water cooling circulation system and the humidifying system are integrally designed. The heat dissipated by the IPM intelligent power module is fully utilized for the preheating of the humidifier, realizing energy recovery and reducing the electric heating power of the humidifier; avoiding the cold quantity of the outdoor cold air from being conducted to the IPM intelligent power module through the refrigeration system, thereby avoiding the condensation phenomenon around the IPM intelligent power module.

[0045] The present invention solves the following technical problems:

[0046] 1. The design of the cooling and heat dissipation cycle of the IPM intelligent power module, that is, the problem of condensation.

[0047] 2. The coupling design of the water-cooling cycle of the IPM intelligent power module and the humidification system of the computer room air conditioner, that is, the problem of high power consumption.

[0048] The water-cooling cycle of the IPM intelligent power module of the present invention is driven by a water pump. The hot water flowing out of the IPM intelligent power module releases heat to the outside in the heat dissipation pipe to reduce the temperature, and then returns to the water pump to form a cooling cycle. The water pump, the heat dissipation plate of the IPM intelligent power module, and the heat dissipation device are sequentially connected to form a water-cooling system.

[0049] The present invention connects the water-cooling system in series into the humidification system, between the water stop valve and the water replenishing valve: the inlet of the water pump and the outlet of the heat dissipation pipe are jointly connected to the outlet of the water stop valve, and the outlet of the heat dissipation plate of the IPM intelligent power module and the inlet of the heat dissipation pipe are jointly connected to the inlet of the water replenishing valve.

[0050] In some embodiments, along the air flow direction, the humidifying pipe 8 is arranged on the downstream side of the air outlet path of the heat dissipation device 3, that is, the heat dissipation device 3 is arranged between the evaporator 2 and the humidifying pipe 8. This is the preferred arrangement form of the humidifying pipe, the heat dissipation device and the evaporator of the present invention. Arranging the humidifying pipe in the air outlet path of the evaporator can humidify the air blown into the room, and arranging the heat dissipation device in the air outlet path of the evaporator can dissipate the heat of the power module through the heat dissipation device into the air blown into the room to complete the cooling of the power module and prevent condensation at the same time. Arranging the humidifying pipe 8 on the downstream side of the air outlet path of the heat dissipation device 3 can make the air pass through the heat dissipation device to be heated first and then pass through the humidifying pipe to be humidified, so that the heated air is more conducive to mixing with the water mist ejected from the humidifying pipe, and can further improve the humidifying effect.

[0051] The preferred embodiment 1 of the present invention, that is Figure 1 the humidifying pipe and the heat dissipation pipe are on the downwind side of the internal fan, but the better way between the heat dissipation pipe and the humidifying pipe is that the heat dissipation pipe is in front and the humidifying pipe is behind, that is, the indoor air is driven by the internal fan to blow to the heat dissipation pipe first and then flow to the humidifying pipe. The main reason is that the hot air is more conducive to mixing with the water mist ejected from the humidifying pipe after the heat dissipation pipe heats the indoor air. Of course, the humidifying pipe and the heat dissipation pipe can also be arranged in the up-and-down position.

[0052] In some embodiments, the isolation heat exchange system 200 further includes an overflow pipe 105. One end of the overflow pipe 105 communicates with the inside of the humidifier 7, and the other end passes through the humidifier 7. The present invention also communicates and arranges an overflow pipe on the humidifier, which can discharge the water in the humidifier exceeding the high preset water level through the overflow pipe to prevent the water level in the humidifying pipe from being too high and causing water to overflow.

[0053] In some embodiments, the humidifying pipe 8 is a hollow pipe structure with an internal accommodation cavity, and a plurality of through holes are formed in its pipe wall. The through holes penetrate from the inner wall to the outer wall of the humidifying pipe 8, so that the condensed water and / or water vapor can be ejected through the through holes. The humidifying pipe of the present invention is preferably set as a hollow pipe with an accommodation cavity, which can accommodate water and eject the water through a plurality of through holes to form an effect of humidifying air.

[0054] In some embodiments, the isolation heat exchange system 200 further includes a bypass pipeline 106 and a check valve 13. One end of the bypass pipeline 106 is connected to the first pipeline 101 and is located on the pipeline section between the water pump 4 and the power module 1. The other end of the bypass pipeline 106 is connected to the first pipeline 101 and is located on the pipeline section between the water pump 4 and the heat dissipation device 3. The check valve 13 is arranged on the bypass pipeline 106, and the check valve 13 is connected in parallel with the water pump 4; the check valve 13 only allows water to flow from the inlet end of the water pump 4 to the outlet end of the water pump 4 (that is, water can only flow from the pipeline section between the water pump 4 and the heat dissipation device 3 to the pipeline section between the water pump 4 and the power module 1); the height of the heat dissipation device 3 is higher than the height of the power module 1.

[0055] This is the preferred structural form of Embodiment 2 of the present invention. Through the setting of the bypass pipeline and the check valve, it can be applicable to the situation where the height of the heat dissipation device is higher than that of the power module. When the height of the heat dissipation device is higher than that of the power module, the coolant in the pipeline is heated into hot water or water vapor when passing through the power module. The density of the hot water becomes smaller, so it can move upward along gravity. Therefore, the effect that the hot water can automatically move to the heat dissipation device for heat dissipation can be realized; and after the heat dissipation is completed at the heat dissipation device and the temperature drops to become cold water, due to the increase in density, the cold water moves downward again to the power module for heating under the action of gravity, so that the automatic operation when the water pump is not started can be effectively realized.

[0056] As Figure 2 shown, on the basis of Figure 1 a bypass check valve of the water pump is added. The flow direction of the check valve only allows the same as the flow direction of the water pump; the outlet of the check valve is connected between the outlet of the water pump and the inlet of the IPM intelligent power module, and the inlet of the check valve is arranged on the common connection pipe section of the inlet of the water pump, the outlet of the heat dissipation pipe and the outlet of the water stop valve. When the water pump works, the outlet of the water pump is at high pressure and the inlet of the water pump is at low pressure. At this time, the check valve is in the reverse high-pressure cut-off state (the check valve does not flow). Figure 2A preferred implementation is that the position of the heat dissipation pipe is higher than that of the heat dissipation plate of the IPM intelligent power module, and the distance is greater than 500 mm; the heat dissipation pipe is on the top and the heat dissipation plate of the IPM intelligent power module is on the bottom. When the water pump stops running, the density of the hot water flowing out of the heat dissipation plate of the IPM intelligent power module becomes smaller, and the hot water flows upward to the heat dissipation pipe to dissipate heat. After the water temperature drops, the density increases, and under the action of gravity, the cold water flows downward and returns to the heat dissipation plate of the IPM intelligent power module, thus forming a gravity circulation system, which can greatly save the electric power of the water pump and thus save electric energy.

[0057] When it is detected that the chip temperature of the IPM intelligent power module is too high during the operation of the gravity circulation system, the water pump is started to turn on the mechanical circulation water cooling system to increase the water flow rate to cool down the IPM intelligent power module. When the water pump stops but water replenishment is needed, the water replenishment enters from the stop valve and flows in two paths. One path enters the IPM intelligent power module through the check valve and then flows out, and the other path enters through the heat dissipation pipe. Then the two paths of water replenishment converge and then enter the humidifier through the water replenishment valve.

[0058] In some embodiments, the power module 1 includes a heat dissipation part. One end of the first pipeline 101 can be communicated with one end of the heat dissipation part of the power module 1, and one end of the second pipeline 102 can be communicated with the other end of the heat dissipation part of the power module 1. This is a preferred structural form of the power module of the present invention, that is, the power module is effectively cooled by the heat dissipation part. One end of the heat dissipation part is communicated with the first pipeline, and the other end is communicated with the second pipeline, so as to be able to introduce water into the heat dissipation part, and then effectively cool and dissipate heat from the heating elements on the power module.

[0059] In some embodiments, the refrigeration system further includes a compressor 10, a condenser 11 and a throttle valve 12, and the power module 1 is an IPM module. The refrigeration system of the present invention preferably includes a compressor, a condenser and a throttle valve, which can effectively realize the circulation operation of the refrigerant, so as to absorb heat by evaporation at the evaporator. The air cooled by evaporation is then heated by the heat dissipation device and humidified by the humidifying pipe, and then enters the room to increase the humidity of the indoor air, effectively preventing the occurrence of condensation on the power module, and using the heat of the power module to provide heat for the humidifier, reducing the humidification heating power consumption and improving the energy efficiency of the system.

[0060] Such as Figure 1As shown, the compressor, condenser, throttle valve, and evaporator of the present invention are sequentially connected to form a refrigeration cycle; the condenser is provided with an external fan (or other heat dissipation devices such as a cooling water pump and a cooling water tower), and the evaporator is provided with an internal fan for driving indoor air to exchange heat through the evaporator. The computer room air conditioner generally also has a humidification system. The humidification pipe of the humidification system is generally arranged on the air outlet side of the evaporator, and the indoor air driven by the internal fan is mixed with the water mist ejected from the humidification pipe to adjust the humidity of the indoor air; the humidification system also has a humidifier, a water replenishing valve, and a water replenishing pipe, and generally also has a water stop valve; the water replenishing pipe, water stop valve, water replenishing valve, humidifier, and humidification pipe are sequentially connected to form a humidification system. The humidification system generally has high water level and low water level judgments to realize on-off control of the water replenishing valve: the water replenishing valve is closed when the water level is high, and the water replenishing valve is opened when the water level is low.

[0061] The present invention also provides a control method for the heat exchange system of the power module as described above, which includes:

[0062] A detection step of detecting the humidity of the indoor air;

[0063] A judgment step of judging the relationship between the air humidity and the high preset humidity and the low preset humidity;

[0064] A control step of, when the humidity of the indoor air is lower than the low preset humidity, controlling the water replenishing valve 9 to open to humidify the air on the air outlet side of the evaporator 2 through the humidifier 7 and the humidification pipe 8, and controlling the water pump 4 to open; when the humidity of the indoor air is higher than the high preset humidity, controlling the water replenishing valve 9 to close to shut off the water from entering the humidifier 7, and controlling the water pump 4 to open; wherein, the high preset humidity is greater than or equal to the low preset humidity.

[0065] This is the preferred control form of the heat exchange system of the power module of the present invention, which can control the opening or closing of the water replenishing valve and the water pump according to the size of the indoor air humidity. The water replenishing valve is opened when the humidity is lower than the low preset humidity to spray misty water and / or water vapor through the humidifier and the humidification pipe, and the water replenishing valve is closed when the humidity is higher than the high preset humidity. However, the water pump is still controlled to open at high humidity to drive the water circuit to continue circulating between the power module and the heat dissipation device, so as to continuously use the heat dissipation device to dissipate heat and cool down the power module; when the humidity is lower than the low preset humidity, the heat of the power module is taken away by the water of the humidifier, and further the heat of the power module is taken away by the heat dissipation of the heat dissipation device; thus, the heat dissipation and cooling of the power module can be effectively realized under different humidity conditions.

[0066] The invention point of the present invention lies in:

[0067] 1. The water-cooled cycle of the IPM intelligent power module is combined with the water replenishing system of the humidifier to realize heat recovery.

[0068] 2. Temperature control method for IPM intelligent power module and water replenishment control method for humidifier.

[0069] In some embodiments, when the water replenishment valve 9 is opened and the humidifier 7 and the humidifying pipe 8 humidify the air on the air outlet side of the evaporator 2:

[0070] The detection step also detects the water level height in the humidifier 7;

[0071] The judgment step also judges the relationship between the water level height and a preset height;

[0072] In the control step, when the water level height is greater than the preset height, the water replenishment valve 9 is controlled to close, the water pump 4 remains open, and the water pump 4, the power module 1 and the heat dissipation device 3 perform a closed circulation; when the water level height is less than or equal to the preset height, the water replenishment valve 9 is controlled to open, and the water pump 4, the power module 1, the heat dissipation device 3 and the humidifier 7 perform an open circulation.

[0073] This is the specific judgment and control form of the present invention according to the water level of the humidifier. By different water level heights, the opening or closing of the water replenishment valve is controlled. When the water level height is higher than the preset height, it means that the humidifier does not need to be replenished with water, so the water replenishment valve is closed. When the water level height is lower than the preset height, it means that water still needs to be replenished to meet the humidification requirement, so the water replenishment valve is controlled to open for water replenishment; after the water replenishment valve is closed, the water pump continues to be open to drive the power module and the heat dissipation device to operate in a closed circulation, maintaining the heat dissipation and cooling effect on the power module; after the water replenishment valve is opened, the water pump is opened to drive the water flow to the humidifier and further can flow into the heat dissipation device, enabling an open circulation and / or a closed circulation (the closed circulation is the same as the closed loop), ensuring the heat dissipation and cooling effect on the power module, and also being able to humidify the indoor air; it is equivalent to using the heat of the power module for indoor humidification, ensuring the indoor humidity.

[0074] The working principle and control method of the present invention are described as follows:

[0075] 1. When the humidifier does not need humidification, the water replenishment valve is closed and no water needs to be replenished. Then, the water-cooled circulation driven by the water pump forms a closed circulation. The cooling water reciprocates under the drive of the water pump, transferring the heat dissipated by the IPM intelligent power module to the heat dissipation pipe to be dissipated. The indoor air driven by the internal fan exchanges heat with the heat dissipation pipe, and the hot water returns to the water pump after cooling.

[0076] 2. When the humidifier needs to be humidified, the water replenishing valve opens for water replenishment. All or part of the hot water flowing out from the heat dissipation plate of the IPM intelligent power module enters the humidifier, is heated and atomized by the humidifier, and then sent out through the humidifying pipe. The water mist is mixed with the indoor air driven by the internal fan to achieve humidification. The original control system of the humidification system automatically judges whether the water replenishment amount is appropriate. When the water replenishment reaches the high water level, the water replenishing valve automatically closes, and the water-cooled circulation driven by the water pump resumes a closed circulation; when the water replenishing valve opens, the water-cooled circulation forms an open circulation and obtains water replenishment from the water replenishing pipe.

[0077] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A heat exchange system for a power module, characterized in that: Comprising: A refrigeration system (100), an isolation heat exchange system (200) and a power module (1), wherein the refrigeration system (100) includes an evaporator (2), the isolation heat exchange system (200) is a circulating pipeline system isolated from the refrigeration system (100), the isolation heat exchange system (200) includes a heat dissipation device (3), the power module (1) is disposed in the isolation heat exchange system (200), and the power module (1) is communicated with the heat dissipation device (3) through a pipeline, and the heat dissipation device (3) is disposed on the air outlet path of the evaporator (2), that is, the heat dissipation device (3) can exchange heat with the air after heat exchange through the evaporator (2).

2. The heat exchange system of the power module according to claim 1, characterized in that: The isolation heat exchange system (200) includes a water pump (4), a first pipeline (101) and a second pipeline (102), one end of the first pipeline (101) can be communicated with one end of the power module (1), the other end of the first pipeline (101) can be communicated with one end of the heat dissipation device (3), one end of the second pipeline (102) can be communicated with the other end of the power module (1), the other end of the second pipeline (102) can be communicated with one end of the heat dissipation device (3), and the water pump (4) is disposed on the first pipeline (101) or the second pipeline (102).

3. The heat exchange system of the power module according to claim 2, characterized in that: The isolation heat exchange system (200) further includes a makeup water pipe (5) and a water stop valve (6), the water pump (4) is disposed on the first pipeline (101), one end of the makeup water pipe (5) is communicated with the first pipeline (101), and the other end can introduce external water, and the water stop valve (6) is disposed on the makeup water pipe (5) to only allow water to flow towards the first pipeline (101).

4. The heat exchange system of the power module according to claim 2, characterized in that: The isolation heat exchange system (200) further includes a humidifier (7), a third pipeline (103), a fourth pipeline (104) and a humidifying pipe (8), one end of the third pipeline (103) is communicated with the second pipeline (102), and the other end is communicated to the inside of the humidifier (7), one end of the fourth pipeline (104) is communicated with the inside of the humidifier (7) to be able to draw out condensed water and / or water vapor from the humidifier (7), the other end of the fourth pipeline (104) is communicated with the humidifying pipe (8), and the humidifying pipe (8) is disposed on the air outlet pipeline of the evaporator (2) to be able to humidify the air cooled by the evaporator (2), and a makeup water valve (9) is disposed on the third pipeline (103).

5. The heat exchange system of the power module according to claim 4, characterized in that: Along the air flow direction, the humidifying pipe (8) is disposed on the downstream side of the air outlet path of the heat dissipation device (3), that is, the heat dissipation device (3) is disposed between the evaporator (2) and the humidifying pipe (8).

6. The heat exchange system of the power module according to claim 4, characterized in that: The isolation heat exchange system (200) further includes an overflow pipe (105), one end of the overflow pipe (105) is communicated to the inside of the humidifier (7), and the other end penetrates out of the humidifier (7).

7. The heat exchange system of the power module according to claim 4, characterized in that: The humidifying pipe (8) is a hollow pipe structure with an internal accommodation cavity, and a plurality of through holes are opened on its pipe wall, and the through holes penetrate from the inner wall to the outer wall of the humidifying pipe (8), so that the condensed water and / or water vapor can be ejected through the through holes.

8. The heat exchange system of the power module according to claim 2, characterized in that: The isolation heat exchange system (200) further includes a bypass pipeline (106) and a one-way valve (13), one end of the bypass pipeline (106) is communicated with the first pipeline (101) and is located on the pipe section between the water pump (4) and the power module (1), and the other end of the bypass pipeline (106) is communicated with the first pipeline (101) and is located on the pipe section between the water pump (4) and the heat dissipation device (3), the one-way valve (13) is arranged on the bypass pipeline (106), and the one-way valve (13) is connected in parallel with the water pump (4); the one-way valve (13) only allows water to flow from the inlet end of the water pump (4) to the outlet end of the water pump (4); the height of the heat dissipation device (3) is higher than the height of the power module (1).

9. The heat exchange system of the power module according to any one of claims 2-8, characterized in that: The power module (1) includes a heat dissipation part, one end of the first pipeline (101) can be communicated with one end of the heat dissipation part of the power module (1), and one end of the second pipeline (102) can be communicated with the other end of the heat dissipation part of the power module (1).

10. The heat exchange system of the power module according to any one of claims 1-8, characterized in that: The refrigeration system further includes a compressor (10), a condenser (11) and a throttle valve (12), and the power module (1) is an IPM module.

11. A control method for a heat exchange system of a power module according to any one of claims 4-7, characterized in that: Comprising: A detection step of detecting the air humidity in the room; A judgment step of judging the relationship between the air humidity and the high preset humidity and the low preset humidity; A control step of, when the air humidity in the room is lower than the low preset humidity, controlling the water replenishing valve (9) to open, so as to humidify the air on the air outlet side of the evaporator (2) through the humidifier (7) and the humidifying pipe (8), and controlling the water pump (4) to open; when the air humidity in the room is higher than the high preset humidity, controlling the water replenishing valve (9) to close, so as to close the water from entering the humidifier (7), and controlling the water pump (4) to open; wherein, the high preset humidity is greater than or equal to the low preset humidity.

12. The control method according to claim 11, characterized in that: When the water replenishing valve (9) is opened and the humidifier (7) and the humidifying pipe (8) humidify the air on the air outlet side of the evaporator (2): The detection step further detects the water level height in the humidifier (7); The judgment step further judges the relationship between the water level height and a preset height; In the control step, when the water level height is greater than the preset height, the water replenishing valve (9) is controlled to close, the water pump (4) remains open, and the water pump (4), the power module (1) and the heat dissipation device (3) perform a closed circulation; when the water level height is less than or equal to the preset height, the water replenishing valve (9) is controlled to open, the water pump (4) remains open, and the water pump (4), the power module (1), the heat dissipation device (3) and the humidifier (7) perform an open circulation.

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