A heat-pipe-based electric control heat dissipation system for air conditioner and control method thereof

Abstract

The application relates to a heat-pipe-based electric control heat dissipation system of an air conditioner and a control method. The heat-pump air conditioning system of the system comprises a refrigerant main circuit and a bypass branch circuit; the refrigerant main circuit comprises a compressor, an indoor heat exchanger, a first three-way valve, a main circuit electronic expansion valve, a second three-way valve, an outdoor heat exchanger and a four-way reversing valve which are sequentially connected, and refrigerant circulates in the refrigerant main circuit; the bypass branch circuit comprises a first electronic expansion valve, a heat dissipation refrigerant pipeline and a second electronic expansion valve which are sequentially connected; the micro-channel heat pipe flat tube is serpentine bent, and the micro-channel heat pipe flat tube comprises an evaporation section flat tube, an adiabatic section flat tube and a condensation section flat tube; the evaporation section flat tube is in surface contact with an electric control heating element, and the condensation section flat tube is in contact with the heat dissipation refrigerant pipeline of the heat-pump air conditioning system through a metal heat exchange block. The heat-pipe-based electric control heat dissipation system of the air conditioner has the advantages of high heat exchange efficiency, high reliability and low cost.

Description

Technical Field

[0001] This invention relates to an electronically controlled heat dissipation system and control method for an air conditioner based on a heat pipe. Background Technology

[0002] Air conditioners, as common devices in modern life, are widely used in various scenarios of people's production and life, from vehicle air conditioners and household air conditioners to commercial central air conditioning systems. In an air conditioner, the electronic control board is the core control circuit for the operation of the entire air conditioning unit. The electronic control board contains many electronic components, including many heat-generating devices such as inverter modules. If these heat-generating devices cannot be cooled, it will lead to a significant increase in the failure rate of the heat-generating devices themselves and even the surrounding electronic components.

[0003] In existing air conditioner electronic control cooling structures, passive heat dissipation using heat sinks or air-cooled radiators with increased ventilation is commonly employed, utilizing forced air convection to achieve heat dissipation. Specifically, the heat generated by the electronic control module board is first conducted to the radiator via thermally conductive adhesive, and then the airflow generated by the outdoor fan transfers the heat from the radiator into the air. While natural cooling is structurally simple, its cooling effect is poor, and the increased temperature of heat-generating components leads to easy damage and a short lifespan. Furthermore, heat sinks are heavy and costly. Since air conditioners contain refrigerant piping, refrigerant cooling is also an option. Refrigerant cooling typically involves direct airflow to dissipate heat; compared to natural cooling, refrigerant cooling is more effective, significantly reducing the temperature of heat-generating components and extending their lifespan.

[0004] The utility model patents CN201420056790.0, "Air Conditioning Electrically Controlled Heat Dissipation System Connected to Refrigerant Pipelines," and CN201621032202.5, "An Electrically Controlled Heat Dissipation Structure for an Air Conditioner and an Outdoor Unit and an Air Conditioner Having the Same," use metal heat sinks to connect the refrigerant pipelines and the electrically controlled heating elements, providing direct cooling for the electrically controlled heat sink. However, at high ambient temperatures, this open-loop active cooling method leads to a large amount of condensate, which can damage the electrical circuitry. Furthermore, when the refrigerant is flammable, such as R290, leaks can cause collisions with electrical sparks from the electrical components, increasing the risk of explosion.

[0005] In summary, the existing electronically controlled heat dissipation technology for air conditioning refrigerants has the following problems:

[0006] (1) Reliability issues when using flammable refrigerant pipelines to dissipate heat from electronic control components;

[0007] (2) The refrigerant pipeline and heating device use metal heat conduction, resulting in low heat exchange efficiency. Summary of the Invention

[0008] This invention proposes an electronically controlled heat dissipation system for air conditioners based on heat pipes, which has the advantages of high heat exchange efficiency, high reliability, and low cost. Its coupling control method with the air conditioner can ensure the safety, reliability, and efficiency of the air conditioner and extend its service life.

[0009] The technical solution of this invention to solve the above problems is: an air conditioner electronically controlled heat dissipation system based on heat pipes, which is special in that:

[0010] This includes heat pump air conditioning systems and microchannel heat pipe flat tubes;

[0011] The microchannel heat pipe flat tube is bent in a serpentine shape. The microchannel heat pipe flat tube includes three sections: an evaporation section flat tube, an insulation section flat tube, and a condensation section flat tube. The evaporation section flat tube is in direct contact with the surface of the electronically controlled heating element.

[0012] The heat pump air conditioning system includes a refrigerant main circuit and a bypass branch circuit. The refrigerant main circuit includes a compressor, an indoor heat exchanger, a first three-way valve, a main circuit electronic expansion valve, a second three-way valve, an outdoor heat exchanger, and a four-way reversing valve connected in sequence, with the refrigerant circulating within the main circuit. The bypass branch circuit includes a first electronic expansion valve, a heat dissipation refrigerant pipeline, and a second electronic expansion valve connected in sequence, with the first electronic expansion valve connected to the first three-way valve and the second electronic expansion valve connected to the second three-way valve. The condensing section flat tube contacts the heat dissipation refrigerant pipeline of the heat pump air conditioning system through a metal heat exchange block.

[0013] or,

[0014] The heat pump air conditioning system includes a compressor, an indoor heat exchanger, a main electronic expansion valve, a heat dissipation refrigerant pipeline, a one-way throttle valve, an outdoor heat exchanger, and a four-way reversing valve connected in sequence; the condensing section flat tube is in contact with the heat dissipation refrigerant pipeline of the heat pump air conditioning system through a metal heat exchange block.

[0015] or,

[0016] The heat pump air conditioning system includes a compressor, an indoor heat exchanger, a main electronic expansion valve, an outdoor heat exchanger, and a four-way reversing valve connected in sequence by pipelines. The condensing section flat tube is wound around the high-pressure liquid storage tank or the refrigerant pipeline.

[0017] Furthermore, each of the two ends of the microchannel heat pipe flat tube is connected to a flat tube channel connector, and the different microchannels in the microchannel heat pipe flat tube are connected within the flat tube channel connector:

[0018] The microchannels within the flat tube of the microchannel heat pipe are numbered. At one end of the flat tube, the odd-numbered microchannels have openings on their lower end faces, and the even-numbered microchannels have openings on their upper end faces. The upper part of the flat tube channel connector has a space to accommodate channels numbered 4n+2 to 4n+4 (n is an integer from 0, 1, 2...), and the lower part has a space to accommodate channels numbered 4n+1 to 4n+3. At the other end of the flat tube 3, the lower end faces of the first and last numbered microchannels have openings, and the upper end faces of the middle numbered microchannels have openings. The lower part of the flat tube channel connector 4 has a space to accommodate the first and last numbered channels, and the upper part has a space to accommodate the middle channels in pairs. The flat tube 3 ultimately forms an internal flow path of 1→3→2→4→5→……4n+1→4n+3→4n+2→4n+4……. The diameter of the openings is approximately equal to the hydraulic diameter of the microchannels.

[0019] Furthermore, the flat tube of the evaporation section is in direct contact with the electrically controlled heating element, and the contact gap is filled with thermally conductive silicone grease.

[0020] Furthermore, the upper and lower channels of the metal heat exchange block, the condensing section flat tube embedded in the lower channel of the metal heat exchange block and arranged in a meandering pattern, and the heat dissipation refrigerant pipe embedded in the upper channel of the metal heat exchange block and arranged in a meandering pattern, increase the heat transfer area, and the contact gaps are filled with thermally conductive silicone grease to reduce thermal resistance. Furthermore, after evacuating the microchannel heat pipe flat tube, a working fluid is injected, with a filling volume of 40%-70% of the internal volume. Preferably, this working fluid is non-flammable, has a high specific heat capacity and saturated pressure-temperature ratio, a low latent heat of vaporization, and a low dynamic viscosity, such as R134a.

[0021] In addition, this invention also proposes a control method for the above-mentioned heat pipe-based air conditioner electronically controlled heat dissipation system, which is characterized by including the following steps:

[0022] S101: Heat pump air conditioning system starts, acquiring T from electronically controlled heating element. d and ambient temperature T a Enter S102.

[0023] S102: Comparison of electronically controlled heating element T d The relative magnitude of the set temperature value T1, if T d If T1 is reached, the heat-generating element needs to dissipate heat, and the process proceeds to S103; otherwise, it returns to S101 to continue monitoring.

[0024] S103: The electronically controlled cooling system starts, opens the three-way valve to introduce bypass refrigerant cooling capacity, and enters S104.

[0025] S104: Determine the air conditioner's operating condition and compare it with the ambient temperature T. a The relative magnitude of T with the set temperature value T2, if T a>T2 indicates that the system is in summer cooling mode and proceeds to S105a; otherwise, it is in winter heating mode and proceeds to S105b.

[0026] S105a: In summer cooling mode, adjust the opening of the first electronic expansion valve K1 to K0 as a throttling device, and the second electronic expansion valve is fully open, with opening K2 at K... max At this time, the flow path of the refrigeration system is: compressor - outdoor heat exchanger (condenser) - second electronic expansion valve - bypass pipeline - first electronic expansion valve (throttling) - indoor heat exchanger (evaporator) - compressor, entering S106.

[0027] S105b: Winter heating mode, adjust the opening of the first electronic expansion valve to be fully open, K1 is K max The second electronic expansion valve K2 is open at K0, acting as a throttling device. At this time, the refrigeration system flow path is: compressor - indoor heat exchanger (condenser) - first electronic expansion valve - bypass pipeline - second electronic expansion valve (throttling) - outdoor heat exchanger (evaporator) - compressor, entering S106.

[0028] S106: Monitoring the temperature T of the electronically controlled heating element d And its rate of change e.

[0029] S107: Compare the temperature T of the electronically controlled heating element d The relative magnitudes of the set temperature value T3, the heating element temperature change rate e, and the set value e0, if T d If T3 or e>e0, the existing cooling capacity is insufficient to stabilize the temperature of the heating element within a suitable range. In summer cooling mode, it enters S108a, and in winter heating mode, it enters S108b. Otherwise, it returns to S106 to continue monitoring until the heat pump air conditioning system stops operating.

[0030] S108a: In summer cooling mode, increase the opening degree K1 of the first electronic expansion valve to K0 + ΔK, and decrease the opening degree K2 of the second electronic expansion valve to K. max -△K, appropriately throttles the refrigerant at the outlet of the outdoor heat exchanger to reduce its temperature, thereby increasing the temperature difference on both sides of the microchannel heat pipe flat tube, enhancing the heat dissipation effect, and then enters S109.

[0031] S108b: In winter heating mode, increase the opening degree K2 of the second electronic expansion valve to K0 + ΔK, and decrease the opening degree K1 of the first electronic expansion valve to K. max -△K, appropriately throttles the refrigerant at the outlet of the indoor heat exchanger to reduce its temperature, thereby increasing the temperature difference on both sides of the microchannel heat pipe flat tube, enhancing the heat dissipation effect, and then enters S109.

[0032] S109: Maintain valve opening for t minutes. In summer cooling mode, return to S105a; in winter heating mode, enter S105b, until the heat pump air conditioning system stops operating.

[0033] Furthermore, in the control method:

[0034] The temperature detection device for measuring the electronically controlled heating element can be installed on the flat tube of the heat pipe evaporator section or on the substrate of the electronically controlled heating element. The set temperature value T1 is used to determine whether the electronically controlled heating element needs refrigerant cooling after the heat pump air conditioning system is started. It is selected according to the operating temperature range of the electronically controlled element, and optionally, it can be set to 40-60℃.

[0035] Setting the temperature value T2 determines whether the air conditioner is operating in summer or winter, and further determines whether the condenser is an outdoor or indoor heat exchanger. Using the refrigerant cooling capacity at the condenser outlet can effectively prevent condensation. Optionally, it can be set to 20-27℃. Alternatively, the air conditioner's built-in control logic for determining operating conditions can also be used.

[0036] The set temperature value T3 is an indicator to determine whether the existing cooling capacity can stabilize the temperature of the electronically controlled heating element within a suitable range. It is determined according to the operating temperature range of the element on the electronic control board, and can optionally be set to 70℃-80℃.

[0037] The set value e0 is an indicator to determine whether the temperature of the electronically controlled heating element is rising rapidly, so as to increase the cooling capacity in advance and avoid damage. Optionally, it can be set to 0.1℃ / s.

[0038] K0 is the opening degree of the electronic expansion valve, which acts as a throttling device in the flow path. It is adjusted and set according to the subcooling, superheat, and other indicators required by the main refrigeration system. The opening change ΔK is the adjustment indicator for reducing the temperature of the bypass refrigerant. It is set according to the specifications of the electronic expansion valve, the initial opening degree K0, and other indicators.

[0039] Advantages of this invention:

[0040] 1) Compared with traditional finned air cooling, this provides a high heat exchange efficiency and low cost air conditioning electronic control cooling method, which is especially suitable for air conditioners that use flammable and explosive refrigerants, improving their safety and reliability.

[0041] 2) It enables the air conditioner's electronic control components to dissipate heat at high temperatures and heat at low temperatures, always operating within a safe temperature range, ensuring stable operation and extending service life.

[0042] 3) It provides coupled control between the air conditioning system and the electronically controlled heat dissipation system, reducing the loss of room cooling capacity due to the addition of electronically controlled heat dissipation and improving energy efficiency. Attached Figure Description

[0043] Figure 1 This is a connection diagram of the heat pipe-based air conditioner electronically controlled heat dissipation system provided by the present invention;

[0044] Figure 2 This is another connection diagram of the heat pipe-based air conditioner electronically controlled heat dissipation system provided by the present invention;

[0045] Figure 3 This is a diagram showing the connection methods for refrigerant piping and heat pipes;

[0046] Figure 4 This is a structural diagram of a flat tube channel connector;

[0047] Figure 5 This is a structural diagram of another flat tube channel connector;

[0048] Figure 6 yes Figure 1 Control flowchart of the heat pipe-based air conditioner electronic control heat dissipation system.

[0049] The components include: 1. Heat pump air conditioning system; 2. Electrically controlled heating element; 3. Microchannel heat pipe flat tube; 4. Flat tube channel connector; 5. Metal heat exchange block; 6. Compressor; 7. Indoor heat exchanger; 8. First three-way valve; 9. Main circuit electronic expansion valve; 100. Four-way reversing valve; 101. Outdoor heat exchanger; 102. First electronic expansion valve; 103. Heat dissipation refrigerant pipeline; 104. Second electronic expansion valve; 105. One-way throttle valve; 110. Second three-way valve; 111. Evaporation section flat tube; 301. Insulation section flat tube; 302. Condensation section flat tube; 303. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0051] Example 1

[0052] See Figure 1 An air conditioner electronically controlled heat dissipation system based on heat pipes includes a heat pump air conditioning system 1, a microchannel heat pipe flat tube 3, and a metal heat exchange block 5.

[0053] The heat pump air conditioning system 1 includes a refrigerant main line and a bypass branch line, wherein the bypass branch line is connected in parallel to the refrigerant main line.

[0054] The refrigerant main circuit includes a compressor 101, an indoor heat exchanger 102, a first three-way valve 103, a main circuit electronic expansion valve 104, a second three-way valve 111, an outdoor heat exchanger 106, and a four-way reversing valve 105 connected in sequence, and the refrigerant circulates in the refrigerant main circuit; the bypass branch includes a first electronic expansion valve 107, a heat dissipation refrigerant pipeline 108, and a second electronic expansion valve 109 connected in sequence, the first electronic expansion valve 107 is connected to the first three-way valve 103, and the second electronic expansion valve 109 is connected to the second three-way valve 111.

[0055] The microchannel heat pipe flat tube 3 is bent in a serpentine shape and includes three sections: an evaporation section flat tube 301, an insulation section flat tube 302, and a condensation section flat tube 303. The evaporation section flat tube 301 is in contact with the electrically controlled heating element 2, and the condensation section flat tube 303 is in contact with the heat dissipation refrigerant pipeline 108 of the heat pump air conditioning system 1 through the metal heat exchange block 5.

[0056] When electronically controlled heat dissipation is required in summer, the first three-way valve 103 and the second three-way valve 111 are opened, and the opening of the second electronic expansion valve 109 is adjusted to regulate the temperature of the bypass refrigerant. The opening of the first electronic expansion valve 107 is adjusted as a branch throttling device. The refrigerant is pressurized by the compressor 101 and condensed by the outdoor heat exchanger 106 (condenser) to a liquid of 30-40℃. The main refrigerant enters the indoor heat exchanger 102 (evaporator) through the throttling device 104. The branch refrigerant in the heat dissipation refrigerant pipeline 108 exchanges heat with the condensing section flat tube 303 through the metal heat exchange block 5, and then undergoes two-phase heat transfer inside the microchannel heat pipe flat tube 3 to cool the electronically controlled heating element 2.

[0057] In winter, by opening the first three-way valve 103 and the second three-way valve 111, the heat pump air conditioning system 1 operates in reverse via the four-way reversing valve 105. The opening of the first electronic expansion valve 107 is adjusted to regulate the temperature of the bypass refrigerant, and the opening of the second electronic expansion valve 109 is adjusted as a branch throttling device. The refrigerant at the outlet of the indoor heat exchanger 102 (condenser) is bypassed to the heat dissipation refrigerant pipeline 108. Although the heat pump air conditioning system 1 operates in reverse during winter and summer, it always uses the refrigerant at the condenser outlet, avoiding condensation caused by excessively low refrigerant temperature at the evaporator inlet, which could threaten the safety of the electronic control components. Simultaneously, when the temperature of the electronic control heating element 2 is low in winter, the heat from the refrigerant at the condenser outlet can be used through the microchannel heat pipe flat tube 3 to heat the electronic control heating element 2, maintaining a normal temperature range and ensuring unit operation.

[0058] Example 2

[0059] See Figure 2The structural difference between this embodiment and Embodiment 1 is that the heat pump air conditioning system 1 includes a compressor 101, an indoor heat exchanger 102, a main electronic expansion valve 104, a refrigerant heat dissipation pipeline 108, a one-way throttle valve 110, an outdoor heat exchanger 106, and a four-way reversing valve 105; the compressor 101, indoor heat exchanger 102, main electronic expansion valve 104, refrigerant heat dissipation pipeline 108, one-way throttle valve 110, outdoor heat exchanger 106, and four-way reversing valve 105 are connected in series. In summer, the main electronic expansion valve 104 is fully open, and the one-way throttle valve 110 operates to throttle the flow. In winter, the electronic expansion valve 104 adjusts its opening to throttle the flow, while the one-way throttle valve 110 is only used as a flow pipeline.

[0060] Example 3

[0061] The structural difference between this embodiment and Embodiment 1 is that the heat pump air conditioning system 1 only retains the main refrigerant circuit. That is, the main refrigerant circuit includes a compressor 101, an indoor heat exchanger 102, a main circuit electronic expansion valve 104, an outdoor heat exchanger 106, and a four-way reversing valve 105 connected sequentially via pipelines. The refrigerant circulates within the main refrigerant circuit. Since the condenser section flat tube 303 is an aluminum microchannel flat tube with good ductility, it can be directly wound around the refrigerant pipeline at a suitable temperature. For example, it can be directly wound around the high-pressure liquid receiver tank of the heat pump air conditioning system 1 or other refrigerant pipelines, serving as the cold source for the condenser section flat tube 303. The high-pressure liquid receiver tank is located at the condenser outlet and is used to store the liquid components of the refrigerant, preventing excessive condensate accumulation in the condenser, which would reduce the heat transfer area and affect the heat transfer effect. It can also be used to adjust the refrigerant charge in the system. Since the outdoor heat exchanger 106 of the heat pump air conditioner functions as a condenser in summer and the indoor heat exchanger 102 functions as a condenser in winter, the high-pressure liquid receiver is located between the indoor heat exchanger 102 and the main electronic expansion valve 104, or between the outdoor heat exchanger 106 and the main electronic expansion valve 104, in the heat pump air conditioning system 1. Utilizing the cooling capacity of the refrigerant in the high-pressure liquid receiver can reduce the impact on the overall performance of the refrigeration system. The other refrigerant pipelines refer to the pipelines between the indoor heat exchanger 102 and the main electronic expansion valve 104, or between the outdoor heat exchanger 106 and the main electronic expansion valve 104, in the heat pump air conditioning system 1. These pipelines contain liquid refrigerant with a high heat transfer coefficient.

[0062] As a preferred embodiment of the present invention, see [link to previous document]. Figure 1 and Figure 2 The two ends of the microchannel heat pipe flat tube 3 are respectively connected to a flat tube channel connector 4, and the different microchannels in the microchannel heat pipe flat tube 3 are connected in the flat tube channel connector 4.

[0063] Specifically, see Figure 4 and Figure 5 The microchannels within the microchannel heat pipe flat tube 3 are numbered. At one end of the flat tube 3, the lower end face of the odd-numbered microchannels is perforated, and the upper end face of the even-numbered microchannels is perforated. The flat tube channel connector 4 has a space at the top for connecting channels numbered 4n+2 to 4n+4, and a space at the bottom for connecting channels numbered 4n+1 to 4n+3. At the other end of the microchannel heat pipe flat tube 3, the lower end face of the first and last numbered microchannels is perforated, and the upper end face of the middle numbered microchannels is perforated. The flat tube channel connector 4 has a space at the bottom for connecting the first and last numbered channels, and a space at the top for connecting pairs of middle channels. The microchannel heat pipe flat tube 3 ultimately forms an internal flow path of 1→3→2→4→5→……4n+1→4n+3→4n+2→4n+4……. The diameter of the perforations is approximately equal to the hydraulic diameter of the microchannels.

[0064] By setting the flat tube channel connector 4, all the microchannels inside the flat tube 3 of the microchannel heat pipe are connected in series in an orderly manner. On the one hand, it increases the number of bends (turns). The more turns there are, the easier it is for the working fluid inside the heat pipe to form a stable unidirectional circulation, which improves the heat transfer limit of the heat pipe. On the other hand, it forms a closed loop. The closed loop provides space for the working fluid inside the heat pipe to circulate, avoids gas-liquid reverse collision, and reduces the heat transfer thermal resistance of the heat pipe.

[0065] As a preferred embodiment of the present invention, see [link to previous document]. Figure 1 and Figure 2 The evaporation section flat tube 301 is in direct contact with the electrically controlled heating element 2, and the contact gap is filled with thermally conductive silicone grease.

[0066] As a preferred embodiment of the present invention, see [link to previous document]. Figure 3 The metal heat exchange block 5 is provided with an upper channel and a lower channel. The condensing section flat tube 303 is embedded in the lower channel of the metal heat exchange block 5 and arranged in a meandering manner. The heat dissipation refrigerant pipe 108 is embedded in the upper channel of the metal heat exchange block 5 and arranged in a meandering manner to increase the heat transfer area. The contact gap is filled with thermally conductive silicone grease to reduce the thermal resistance.

[0067] In a preferred embodiment of the present invention, the length ratio of the three sections—evaporation section flat tube 301, insulation section flat tube 302, and condensation section flat tube 303—is approximately 1:0.7:1. After vacuuming, the microchannel heat pipe flat tube 3 is injected with a working fluid, the filling amount being 40%-70% of its internal volume. This working fluid is non-flammable and possesses high specific heat capacity and saturated pressure-temperature ratio, low latent heat of vaporization, and low dynamic viscosity, such as R134a.

[0068] Example 4

[0069] See Figure 6A control method for an air conditioner's electronically controlled heat dissipation system based on heat pipes, comprising the following steps:

[0070] S101: The heat pump air conditioning system starts and obtains the temperature T of the electronically controlled heating element 2. d and ambient temperature T a Enter S102;

[0071] S102: Compare the temperature T of the electronically controlled heating element 2 d The relative magnitude of the set temperature value T1, if T d If T1 is reached, the heat-generating element needs to dissipate heat, and the process proceeds to S103; otherwise, the process returns to S101 to continue monitoring.

[0072] S103: The electronically controlled cooling system starts, opens the three-way valve to introduce bypass refrigerant cooling capacity, and enters S104;

[0073] S104: Determine the air conditioner's operating condition and compare it with the ambient temperature T. a The relative magnitude of T with the set temperature value T2, if T a >T2 indicates that the system is in summer cooling mode and proceeds to S105a; otherwise, it is in winter heating mode and proceeds to S105b.

[0074] S105a: Summer cooling mode, adjust the opening degree K1 of the first electronic expansion valve 107 to K0 as a throttling device, and the second electronic expansion valve 109 is fully open, with opening K2 set to K. max At this time, the flow path of the refrigeration system is: compressor 101 - outdoor heat exchanger 106 - second electronic expansion valve 109 - bypass pipeline - first electronic expansion valve 107 - indoor heat exchanger 102 - compressor 101, entering S106;

[0075] S105b: Winter heating mode, adjust the opening of the first electronic expansion valve 107 to be fully open, K1 is K max The second electronic expansion valve 109 has an opening degree K2 of K0, which acts as a throttling device. At this time, the flow path of the refrigeration system is: compressor 101 - indoor heat exchanger 102 - first electronic expansion valve 107 - bypass pipe - second electronic expansion valve 109 - outdoor heat exchanger 106 - compressor 101, entering S106.

[0076] S106: Monitor the temperature T of the electronically controlled heating element 2 d and its rate of change e;

[0077] S107: Compare the temperature T of the electronically controlled heating element 2 d The relative magnitudes of the set temperature value T3, the heating element temperature change rate e, and the set value e0, if T dIf T3 or e>e0, the existing cooling capacity is insufficient to stabilize the temperature of the heating element within a suitable range. In summer cooling mode, it enters S108a, and in winter heating mode, it enters S108b. Otherwise, it returns to S106 to continue monitoring until the heat pump air conditioning system stops operating.

[0078] S108a: In summer cooling mode, increase the opening degree K1 of the first electronic expansion valve 107 to K0 + ΔK, and decrease the opening degree K2 of the second electronic expansion valve 109 to K. max -△K, appropriately throttle the refrigerant at the outlet of outdoor heat exchanger 106 to reduce the temperature, thereby increasing the temperature difference on both sides of the microchannel heat pipe flat tube, enhancing the heat dissipation effect, and entering S109;

[0079] S108b: In winter heating mode, increase the opening degree K2 of the second electronic expansion valve 109 to K0+ΔK, and decrease the opening degree K1 of the first electronic expansion valve 107 to K. max -△K, appropriately throttles and lowers the temperature of the refrigerant at the outlet of indoor heat exchanger 102, thereby increasing the temperature difference on both sides of the microchannel heat pipe flat tube, enhancing the heat dissipation effect, and entering S109;

[0080] S109: Maintain valve opening for t minutes. In summer cooling mode, return to S105a; in winter heating mode, enter S105b, until the heat pump air conditioning system stops operating.

[0081] In the above control methods:

[0082] The temperature detection device for measuring the electronically controlled heating element 2 is installed on the flat tube 301 of the heat pipe evaporation section or on the substrate of the electronically controlled heating element 2.

[0083] The set temperature value T1 is used to determine whether the electronically controlled heating element needs refrigerant cooling after the heat pump air conditioning system is started. It is selected according to the operating temperature range of the electronically controlled element, and can optionally be set to 40-60℃.

[0084] Setting the temperature value T2 determines whether the air conditioner is operating in summer or winter, and further determines whether the condenser is an outdoor or indoor heat exchanger. Using the refrigerant cooling capacity at the condenser outlet can effectively prevent condensation. Optionally, it can be set to 20-27℃. Alternatively, the air conditioner's built-in control logic for determining operating conditions can also be used.

[0085] The set temperature value T3 is an indicator to determine whether the existing cooling capacity can stabilize the temperature of the electronically controlled heating element within a suitable range. It is determined based on the operating temperature range of the element on the control board, and can optionally be set to 70℃-80℃. The set value e0 is an indicator to determine whether the temperature of the electronically controlled heating element is rising rapidly, so as to increase the cooling capacity in advance and avoid damage. Optionally, it can be set to 0.1℃ / s.

[0086] K0 is the opening degree of the electronic expansion valve, which acts as a throttling device in the flow path. It is adjusted and set according to the subcooling, superheat, and other indicators required by the main refrigeration system.

[0087] The opening change ΔK is an adjustment indicator for reducing the temperature of the bypass refrigerant, and is set according to the specifications of the electronic expansion valve, the initial opening K0, and other indicators.

[0088] The above description is merely an embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related system fields, are similarly included within the scope of protection of the present invention.

Claims

1. A heat pipe-based electrically controlled heat dissipation system for an air conditioner, characterized in that: Including heat pump air conditioning system (1) and microchannel heat pipe flat tube (3); The microchannel heat pipe flat tube (3) is bent in a serpentine shape. The microchannel heat pipe flat tube (3) includes three sections: evaporation section flat tube (301), insulation section flat tube (302), and condensation section flat tube (303). The evaporation section flat tube (301) is in direct surface contact with the electronically controlled heating element (2). The heat pump air conditioning system (1) includes a refrigerant main circuit and a bypass branch circuit. The refrigerant main circuit includes a compressor (101), an indoor heat exchanger (102), a first three-way valve (103), a main circuit electronic expansion valve (104), a second three-way valve (111), an outdoor heat exchanger (106), and a four-way reversing valve (105) connected in sequence. The refrigerant circulates in the refrigerant main circuit. The bypass branch circuit includes a first electronic expansion valve (107), a heat dissipation refrigerant pipeline (108), and a second electronic expansion valve (109) connected in sequence. The first electronic expansion valve (107) is connected to the first three-way valve (103), and the second electronic expansion valve (109) is connected to the second three-way valve (111). The condensing section flat tube (303) is in contact with the heat dissipation refrigerant pipeline (108) of the heat pump air conditioning system (1) through a metal heat exchange block (5). The two ends of the microchannel heat pipe flat tube (3) are respectively connected to a flat tube channel connector (4), and the different microchannels in the microchannel heat pipe flat tube (3) are connected in the flat tube channel connector (4); The microchannels inside the microchannel heat pipe flat tube (3) are numbered. At one end of the microchannel heat pipe flat tube (3), the lower end face of the odd-numbered microchannels is opened, and the upper end face of the even-numbered microchannels is opened. The upper part of the flat tube channel connector (4) has a space to accommodate channels numbered 4n+2 to 4n+4, and the lower part has a space to accommodate channels numbered 4n+1 to 4n+3. At the other end of the microchannel heat pipe flat tube (3), the lower end face of the first and last numbered microchannels is opened, and the upper end face of the middle numbered microchannels is opened. The lower part of the flat tube channel connector (4) has a space to accommodate channels numbered first and last, and the upper part has a space to accommodate channels in pairs. The microchannel heat pipe flat tube (3) eventually forms a microchannel internal flow path of 1→3→2→4→5→……4n+1→4n+3→4n+2→4n+4…….

2. The heat pipe-based air conditioner electronically controlled heat dissipation system according to claim 1, characterized in that: The evaporation section flat tube (301) is in direct contact with the electrically controlled heating element (2), and the contact gap is filled with thermally conductive silicone grease.

3. The heat pipe-based air conditioner electronically controlled heat dissipation system according to claim 2, characterized in that: The metal heat exchange block (5) is provided with an upper channel and a lower channel. The condensing section flat tube (303) is embedded in the lower channel of the metal heat exchange block (5) and arranged in a meandering manner. The heat dissipation refrigerant pipeline (108) is embedded in the upper channel of the metal heat exchange block (5) and arranged in a meandering manner to increase the heat transfer area. The contact gap is filled with thermally conductive silicone grease to reduce the thermal resistance.

4. The heat pipe-based air conditioner electronically controlled heat dissipation system according to claim 3, characterized in that: After the microchannel heat pipe flat tube (3) is evacuated, a working fluid is injected into it. The filling amount is 40%-70% of the internal volume. The working fluid is R134a, which is non-flammable.

5. A control method for an air conditioner electronically controlled heat dissipation system based on a heat pipe, as described in any one of claims 1-4, characterized in that, Includes the following steps: S101: The heat pump air conditioning system starts and obtains the temperature T of the electronically controlled heating element (2). d and ambient temperature T a Enter S102; S102: Compare the temperature T of the electronically controlled heating element (2). d The relative magnitude of the set temperature value T1, if T d If T1 is reached, the heat-generating element needs to dissipate heat, and the process proceeds to S103; otherwise, the process returns to S101 to continue monitoring. S103: The electronically controlled cooling system starts, opens the three-way valve to introduce bypass refrigerant cooling capacity, and enters S104; S104: Determine the air conditioner's operating condition and compare it with the ambient temperature T. a The relative magnitude of T with the set temperature value T2, if T a >T2 indicates that the system is in summer cooling mode and proceeds to S105a; otherwise, it is in winter heating mode and proceeds to S105b. S105a: Summer cooling mode, adjust the opening degree K1 of the first electronic expansion valve (107) to K0 as a throttling device, and the second electronic expansion valve (109) is fully open, with the opening degree K2 set to K0. max At this time, the flow path of the refrigeration system is: compressor (101) - outdoor heat exchanger (106) - second electronic expansion valve (109) - bypass pipeline - first electronic expansion valve (107) - indoor heat exchanger (102) - compressor (101), entering S106; S105b: Winter heating mode, adjust the opening of the first electronic expansion valve (107) to be fully open, K1 is K max The second electronic expansion valve (109) has an opening degree K2 of K0, which acts as a throttling device. At this time, the flow path of the refrigeration system is: compressor (101) - indoor heat exchanger (102) - first electronic expansion valve (107) - bypass pipeline - second electronic expansion valve (109) - outdoor heat exchanger (106) - compressor (101), entering S106; S106: Monitor the temperature T of the electronically controlled heating element (2) d and its rate of change e; S107: Comparison of temperature T of electronically controlled heating element (2) d The relative magnitudes of the set temperature value T3, the heating element temperature change rate e, and the set value e0, if T d If T3 or e>e0, the existing cooling capacity is insufficient to stabilize the temperature of the heating element within a suitable range. In summer cooling mode, it enters S108a, and in winter heating mode, it enters S108b. Otherwise, it returns to S106 to continue monitoring until the heat pump air conditioning system stops operating. S108a: In summer cooling mode, increase the opening degree K1 of the first electronic expansion valve (107) to K0+ΔK, and decrease the opening degree K2 of the second electronic expansion valve (109) to K. max -△K, appropriately throttle the refrigerant at the outlet of the outdoor heat exchanger (106) to reduce the temperature, thereby increasing the temperature difference on both sides of the microchannel heat pipe flat tube, enhancing the heat dissipation effect, and entering S109; S108b: In winter heating mode, increase the opening degree K2 of the second electronic expansion valve (109) to K0+ΔK, and decrease the opening degree K1 of the first electronic expansion valve (107) to K. max -△K, appropriately throttle the refrigerant at the outlet of the indoor heat exchanger (102) to reduce the temperature, thereby increasing the temperature difference on both sides of the microchannel heat pipe flat tube, enhancing the heat dissipation effect, and entering S109; S109: Maintain valve opening for t minutes. In summer cooling mode, return to S105a; in winter heating mode, enter S105b, until the heat pump air conditioning system stops operating.

6. The control method for the heat pipe-based air conditioner electronically controlled heat dissipation system according to claim 5, characterized in that: The temperature detection device for measuring the electric heating element (2) is installed on the flat tube (301) of the heat pipe evaporation section or on the substrate of the electric heating element (2).

7. The control method for the heat pipe-based air conditioner electronically controlled heat dissipation system according to claim 6, characterized in that: The set temperature value T1 is used as the standard for judging whether the electronically controlled heating element (2) needs to dissipate refrigerant cooling after the heat pump air conditioning system is started. It is selected according to the operating temperature range of the electronically controlled element and set to 40-60℃. The set temperature value T2 is used to determine whether the air conditioner is in summer or winter, and further to determine whether the condenser is an outdoor heat exchanger (106) or an indoor heat exchanger (102). Using the refrigerant cooling capacity at the condenser outlet can effectively avoid the generation of condensate. The temperature is set to 20-27℃.

8. The control method for the heat pipe-based air conditioner electronically controlled heat dissipation system according to claim 7, characterized in that: The set temperature value T3 is an indicator to determine whether the existing cooling capacity can stabilize the temperature of the electronically controlled heating element (2) in a suitable range. It is determined according to the operating temperature range of the element on the electronic control board and is set to 70℃-80℃. The set value e0 is an indicator to determine whether the temperature of the electronically controlled heating element (2) is rising rapidly, so as to increase the cooling capacity in advance and avoid damage. It is set to 0.1℃ / s.

9. A heat pipe-based electrically controlled heat dissipation system for an air conditioner, characterized in that: Including heat pump air conditioning system (1) and microchannel heat pipe flat tube (3); The microchannel heat pipe flat tube (3) is bent in a serpentine shape. The microchannel heat pipe flat tube (3) includes three sections: evaporation section flat tube (301), insulation section flat tube (302), and condensation section flat tube (303). The evaporation section flat tube (301) is in direct surface contact with the electronically controlled heating element (2). The heat pump air conditioning system (1) includes a compressor (101), an indoor heat exchanger (102), a main electronic expansion valve (104), a heat dissipation refrigerant pipeline (108), a one-way throttle valve (110), an outdoor heat exchanger (106), and a four-way reversing valve (105) connected in sequence; the condensing section flat tube (303) is in contact with the heat dissipation refrigerant pipeline (108) of the heat pump air conditioning system (1) through a metal heat exchange block (5); The two ends of the microchannel heat pipe flat tube (3) are respectively connected to a flat tube channel connector (4), and the different microchannels in the microchannel heat pipe flat tube (3) are connected in the flat tube channel connector (4); The microchannels inside the microchannel heat pipe flat tube (3) are numbered. At one end of the microchannel heat pipe flat tube (3), the lower end face of the odd-numbered microchannels is opened, and the upper end face of the even-numbered microchannels is opened. The upper part of the flat tube channel connector (4) has a space to accommodate channels numbered 4n+2 to 4n+4, and the lower part has a space to accommodate channels numbered 4n+1 to 4n+3. At the other end of the microchannel heat pipe flat tube (3), the lower end face of the first and last numbered microchannels is opened, and the upper end face of the middle numbered microchannels is opened. The lower part of the flat tube channel connector (4) has a space to accommodate channels numbered first and last, and the upper part has a space to accommodate channels in pairs. The microchannel heat pipe flat tube (3) eventually forms a microchannel internal flow path of 1→3→2→4→5→……4n+1→4n+3→4n+2→4n+4…….

10. The heat pipe-based air conditioner electronically controlled heat dissipation system according to claim 9, characterized in that: The evaporation section flat tube (301) is in direct contact with the electrically controlled heating element (2), and the contact gap is filled with thermally conductive silicone grease; After the microchannel heat pipe flat tube (3) is evacuated, a working fluid is injected into it. The filling amount is 40%-70% of the internal volume. The working fluid is R134a, which is non-flammable.

11. The heat pipe-based air conditioner electronically controlled heat dissipation system according to claim 10, characterized in that: The metal heat exchange block (5) is provided with an upper channel and a lower channel. The condensing section flat tube (303) is embedded in the lower channel of the metal heat exchange block (5) and arranged in a meandering manner. The heat dissipation refrigerant pipeline (108) is embedded in the upper channel of the metal heat exchange block (5) and arranged in a meandering manner to increase the heat transfer area. The contact gap is filled with thermally conductive silicone grease to reduce the thermal resistance.

12. An air conditioner electronically controlled heat dissipation system based on heat pipes, characterized in that: Including heat pump air conditioning system (1) and microchannel heat pipe flat tube (3); The microchannel heat pipe flat tube (3) is bent in a serpentine shape. The microchannel heat pipe flat tube (3) includes three sections: evaporation section flat tube (301), insulation section flat tube (302), and condensation section flat tube (303). The evaporation section flat tube (301) is in direct surface contact with the electronically controlled heating element (2). The heat pump air conditioning system (1) includes a compressor (101), an indoor heat exchanger (102), a main electronic expansion valve (104), an outdoor heat exchanger (106), and a four-way reversing valve (105) connected in sequence by pipelines. The condensing section flat tube (303) is wrapped around the high-pressure liquid storage tank or the refrigerant pipeline. The two ends of the microchannel heat pipe flat tube (3) are respectively connected to a flat tube channel connector (4), and the different microchannels in the microchannel heat pipe flat tube (3) are connected in the flat tube channel connector (4); The microchannels inside the microchannel heat pipe flat tube (3) are numbered. At one end of the microchannel heat pipe flat tube (3), the lower end face of the odd-numbered microchannels is opened, and the upper end face of the even-numbered microchannels is opened. The upper part of the flat tube channel connector (4) has a space to accommodate channels numbered 4n+2 to 4n+4, and the lower part has a space to accommodate channels numbered 4n+1 to 4n+3. At the other end of the microchannel heat pipe flat tube (3), the lower end face of the first and last numbered microchannels is opened, and the upper end face of the middle numbered microchannels is opened. The lower part of the flat tube channel connector (4) has a space to accommodate channels numbered first and last, and the upper part has a space to accommodate channels numbered two to two. The microchannel heat pipe flat tube (3) eventually forms a microchannel internal flow path of 1→3→2→4→5→……4n+1→4n+3→4n+2→4n+4……. The evaporation section flat tube (301) is in direct contact with the electrically controlled heating element (2), and the contact gap is filled with thermally conductive silicone grease; After the microchannel heat pipe flat tube (3) is evacuated, a working fluid is injected into it. The filling amount is 40%-70% of the internal volume. The working fluid is R134a, which is non-flammable.

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