An air conditioning system

Abstract

This application discloses an air conditioning system, including a compressor, an indoor heat exchanger, and an outdoor heat exchanger. The compressor, indoor heat exchanger, and outdoor heat exchanger are connected by a four-way valve to form a refrigerant circulation loop. The air conditioning system also includes: a liquid-cooled module disposed near the electrical box, wherein a first flow channel, a second flow channel, and a third flow channel are formed within the liquid-cooled module. The first and second flow channels are connected in parallel to form a parallel flow channel. A unidirectional throttling structure is respectively provided in the first and second flow channels, and the unidirectional throttling structure has a forward flow direction and a counter-flow direction; and a power device disposed within the electrical box, adjacent to the flow channel in the forward flow direction from the outdoor heat exchanger to the indoor heat exchanger. In this air conditioning system, by arranging the power device adjacent to the flow channel in the forward flow direction from the outdoor heat exchanger to the indoor heat exchanger, in heating mode, a small amount of refrigerant flows through this flow channel, the flow velocity decreases, and the convective thermal resistance increases, which can reduce the heat absorption of the refrigerant around the flow channel. The power device can use its own heat to heat the temperature of the nearby liquid-cooled module above the dew point temperature, thereby preventing condensation.

Description

Technical Field

[0001] This invention belongs to the field of air conditioning technology. Background Technology

[0002] The liquid-cooled heat dissipation unit of an air conditioner is typically connected in series with the main system circuit and located at the compressor outlet. In cooling mode, the refrigerant temperature Tchg is higher than the ambient temperature Ta, reaching a maximum of 60°C. This necessitates increasing the refrigerant flow rate and increasing internal disturbances to reduce convective thermal resistance. In heating mode, Tchg is lower than the ambient temperature, reaching as low as -20°C. This requires addressing condensation issues through throttling control, increasing heat transfer resistance, and auxiliary heating.

[0003] Common control methods include: (1) using electronic expansion valves, check valves, auxiliary circuit control, etc. to throttle the refrigerant, thereby improving heat dissipation and condensation. This method is usually more expensive, costing 2-3 times more than traditional liquid cooling. (2) using a heating device and auxiliary heating of the electrical control module based on temperature detection. This method requires additional control circuitry, significantly improving electrical lifespan, but also increasing costs considerably. (3) detecting the target temperature of the controller and controlling it through an algorithm. The system adjusts operating parameters based on this algorithm to ensure the controller avoids the risk of condensation and plate explosion. This method will inevitably affect the overall operating capacity of the machine. In some special operating conditions, especially for water-based models, this method is basically unusable. Summary of the Invention

[0004] This invention addresses the problems of high cost and low reliability of software-controlled electronic components in existing air conditioner liquid cooling heat dissipation units, which use electronic expansion valves, check valves, and auxiliary circuit control to throttle refrigerant. It proposes an air conditioning system that solves these problems.

[0005] To achieve the above-mentioned objectives, the present invention employs the following technical solution: An air conditioning system includes a compressor, an indoor heat exchanger, and an outdoor heat exchanger, wherein the compressor, indoor heat exchanger, and outdoor heat exchanger are connected via a four-way valve to form a refrigerant circulation loop. The air conditioning system further includes: A liquid-cooled module is located near the electrical box. The liquid-cooled module has a first flow channel, a second flow channel, and a third flow channel. The first and second flow channels are connected in parallel to form a parallel flow channel, which is connected in series with the third flow channel. The other end of the parallel flow channel is connected to the outdoor heat exchanger, and the other end of the third flow channel is connected to the indoor heat exchanger. The first and second flow channels are respectively provided with a one-way throttling structure. The one-way throttling structure has a forward flow direction and a reverse flow direction. The forward flow direction of the first flow channel is opposite to that of the second flow channel. When the refrigerant flows in the forward flow direction, it flows normally. When it flows in the reverse flow direction, it is throttled. A power device is disposed within the electrical box, and the power device is disposed adjacent to a flow channel that flows from the outdoor heat exchanger to the indoor heat exchanger in the positive direction, or adjacent to the third flow channel.

[0006] In some embodiments, the first end of the first flow channel and the first end of the second flow channel are respectively connected to the outdoor heat exchanger through a first connecting pipe, the second end of the first flow channel and the second end of the second flow channel are respectively connected to the first end of the third flow channel, and the second end of the third flow channel is connected to the indoor heat exchanger through a second connecting pipe. The power devices include a first type of power device and a second type of power device. The contact surface between the first type of power device and the liquid cooling module is planar, while the contact surface between the second type of power device and the liquid cooling module is non-planar. The first type of power device is disposed adjacent to the first flow channel, and the second type of power device is disposed adjacent to the third flow channel.

[0007] In some embodiments, the one-way throttling structure is a Tesla valve structure or a throttling valve. When the one-way throttling structure is a throttling valve, the opening of the throttling valve is fully open when the refrigerant flows in the forward direction, and the opening of the throttling valve is reduced when the refrigerant flows in the reverse direction.

[0008] In some embodiments, the third flow channel includes a first branch and a second branch connected in parallel, with a receiving space formed between the first branch and the second branch. The receiving space has recesses that correspond one-to-one with the second type of power devices. The second type of power devices are disposed in the corresponding recesses, and the gap between the second type of power devices and the recesses is filled with thermally conductive material.

[0009] In some embodiments, a plurality of turbulence structures are formed protruding on the inner wall of the first flow channel, and the plurality of turbulence structures are arranged in an alternating manner and extend in the flow direction of the refrigerant.

[0010] In some embodiments, the turbulence structure is a quadrangular prism with a rhombus-shaped cross-section in the horizontal direction, and the long diagonal of the rhombus is arranged in the direction of refrigerant flow.

[0011] In some embodiments, an isolation groove is provided between the first flow channel and the second flow channel, the isolation groove extending along the extension direction of the first flow channel and the second flow channel, and a phase change material is disposed in the isolation groove.

[0012] In some embodiments, the liquid cooling module has a step protruding at least at a position corresponding to the first flow channel, and the first type of power device is disposed on the step surface.

[0013] In some embodiments, the step is made of a thermally conductive material.

[0014] In some embodiments, the parallel flow channel is connected to the outdoor heat exchanger via a first connecting pipe, and the third flow channel is connected to the indoor heat exchanger via a second connecting pipe, with the first connecting pipe and the second connecting pipe located on the same side of the liquid cooling module.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are: The air conditioning system of the present invention is connected in parallel between an indoor heat exchanger and an outdoor heat exchanger via a first flow channel and a second flow channel. A one-way throttling structure is provided in the first flow channel and the second flow channel respectively. The one-way throttling structure has a forward flow direction and a reverse flow direction. The forward flow direction of the first flow channel is opposite to that of the second flow channel. When the refrigerant flows in the forward flow direction, it flows normally. When it flows in the reverse flow direction, it is throttled.

[0016] Therefore, in air conditioning heating mode, the refrigerant temperature is lower than the ambient temperature. The refrigerant flows from the indoor heat exchanger to the outdoor heat exchanger, primarily through the channel flowing from the indoor heat exchanger to the outdoor heat exchanger. Only a small amount of refrigerant is throttled in the channel flowing from the outdoor heat exchanger to the indoor heat exchanger, resulting in a decreased flow velocity and increased convective thermal resistance. This small amount of refrigerant and increased convective thermal resistance reduce heat absorption by the refrigerant around the channel. The power devices can use their own heat to heat the nearby liquid-cooled modules above their dew point temperature, preventing condensation and protecting the power devices from corrosion by condensation. Simultaneously, the heat generated by the power devices is carried away, achieving cooling for the devices.

[0017] In air conditioning cooling mode, the refrigerant flows from the outdoor heat exchanger to the indoor heat exchanger. Therefore, it mainly flows through the flow channel with the direction from the outdoor heat exchanger to the indoor heat exchanger as the positive flow direction. The refrigerant temperature is lower than the surface temperature of the power device, which can remove the heat from the surface of the power device and cool it down.

[0018] This solution achieves unidirectional throttling through physical structure, automatically selecting the appropriate flow path based on the different resistances of the two channels during cooling and heating. By placing the power device adjacent to the flow path from the outdoor heat exchanger to the indoor heat exchanger (which is the positive flow direction), it can cool the power device in hot mode while simultaneously using the power device's own heat to heat the liquid cooling module to prevent condensation. In air conditioning cooling mode, it also cools the power device. No external electronic control devices are required, resulting in higher reliability and lower cost.

[0019] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the electrical box in one embodiment of the air conditioning system proposed in this invention; Figure 2 This is an exploded view of the electrical box and liquid cooling module in one embodiment of the air conditioning system proposed in this invention; Figure 3 This is a schematic diagram of the liquid cooling module in one embodiment of the air conditioning system proposed in this invention; Figure 4 This is a cross-sectional view of the liquid cooling module in one embodiment of the air conditioning system proposed in this invention; Figure 5 This is a partial structural schematic diagram of the liquid cooling module in one embodiment of the air conditioning system proposed in this invention; Figure 6 yes Figure 5 Enlarged view of part A; Figure 7 This is a partial structural schematic diagram of the isolation groove in one embodiment of the air conditioning system proposed in this invention; Figure 8 This is a plan view of the cross-section of the liquid cooling module in one embodiment of the air conditioning system proposed in this invention; Figure 9 This is a schematic diagram of the forward flow direction of the first flow channel in one embodiment of the air conditioning system proposed in this invention; Figure 10 This is a schematic diagram of the reverse flow direction of the second flow channel in one embodiment of the air conditioning system proposed in this invention; Figure 11 This is a system schematic diagram of one embodiment of the air conditioning system proposed in this invention. Detailed Implementation

[0022] 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 some embodiments of the present invention, not all embodiments. 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.

[0023] It should be noted that in the description of this invention, terms such as "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] <Basic Operating Principles of Air Conditioners> In this application, the air conditioning system performs a refrigerant cycle using a compressor, condenser, electronic expansion valve, and evaporator. The refrigerant cycle includes a series of processes involving compression, condensation, expansion, and evaporation, supplying refrigerant to conditioned and heat-exchanged air.

[0026] The compressor compresses refrigerant gas at a low temperature and low pressure and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0027] The expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve, returning the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0028] The outdoor unit of an air conditioner refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of an air conditioner includes the indoor heat exchanger, and the expansion valve can be provided in either the indoor or outdoor unit.

[0029] The indoor and outdoor heat exchangers can be used as condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner functions as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0030] <Composition of the outdoor unit> Reference Figure 1 , Figure 2 , Figure 3 , Figure 11 As shown, an air conditioning system according to some embodiments of this application includes an indoor unit (not shown) installed in an indoor space. The indoor unit is connected to an outdoor unit installed in an outdoor space via pipes. The outdoor unit may include a compressor 11, an outdoor heat exchanger 12, an outdoor fan, an expansion device, and similar components of a refrigeration cycle, and the indoor unit may also include an indoor heat exchanger and an indoor fan.

[0031] The compressor 11, indoor heat exchanger and outdoor heat exchanger 12 are connected by a four-way valve 13 to form a refrigerant circulation loop. The air conditioning system also includes a liquid cooling module 14, which is located near the electrical box 10. The liquid cooling module 14 is connected to the refrigerant circulation loop. When the refrigerant flows through the liquid cooling module 14, it carries away the surrounding heat and is used to dissipate heat for the power devices in the electrical box 10.

[0032] In some embodiments, such as Figures 4-5 As shown, the liquid-cooled module 14 has a first flow channel 141, a second flow channel 142, and a third flow channel 143. The first flow channel 141 and the second flow channel 142 are connected in parallel to form a parallel flow channel, which is connected in series with the third flow channel 143. The other end of the parallel flow channel is connected to the outdoor heat exchanger 12, and the other end of the third flow channel 143 is connected to the indoor heat exchanger. The first flow channel 141 and the second flow channel 142 are each equipped with a unidirectional throttling structure. The unidirectional throttling structure has a forward flow direction and a counter-flow direction, and the forward flow direction of the first flow channel 141 is opposite to that of the second flow channel 142. The refrigerant flows normally when flowing in the forward direction and is throttled when flowing in the counter-flow direction.

[0033] In air conditioning heating mode, the refrigerant flows from the indoor heat exchanger through the liquid-cooled module 14 to the outdoor heat exchanger 12. Therefore, when the refrigerant reaches the parallel flow path in the liquid-cooled module 14, the flow path from the indoor heat exchanger to the outdoor heat exchanger 12 has the least resistance, and the refrigerant mainly flows through this path. The flow path from the outdoor heat exchanger 12 to the indoor heat exchanger, which is the positive flow direction, is throttled, and only a small amount of refrigerant passes through it.

[0034] In air conditioning cooling mode, the refrigerant flows from the outdoor heat exchanger 12 through the liquid-cooled module 14 to the indoor heat exchanger. Therefore, when the refrigerant reaches the parallel flow channel of the liquid-cooled module 14, the flow channel with the direction from the outdoor heat exchanger to the indoor heat exchanger as the positive flow direction has less resistance, and the refrigerant mainly flows through this channel. The flow channel with the direction from the indoor heat exchanger to the outdoor heat exchanger as the positive flow direction is throttled, and only a small amount of refrigerant passes through this channel.

[0035] The power device is installed inside the electrical box 10, and is installed adjacent to the flow channel from the outdoor heat exchanger 12 to the indoor heat exchanger as the positive flow direction, or adjacent to the third flow channel 143.

[0036] In air conditioning heating mode, the refrigerant temperature is lower than the ambient temperature. The refrigerant flows from the indoor heat exchanger to the outdoor heat exchanger 12 via the liquid-cooled module 14. Therefore, the flow path near the power device is in reverse flow. The refrigerant is throttled as it flows through this path, resulting in a decreased flow velocity and increased convective thermal resistance. The small amount of refrigerant and the increased convective thermal resistance reduce heat absorption by the refrigerant around the flow path. The power device can use its own heat to heat the nearby liquid-cooled module above its dew point temperature, thus preventing condensation and protecting the power device from corrosion by condensation. Simultaneously, the heat generated by the power device is carried away, achieving the purpose of cooling the power device.

[0037] In air conditioning cooling mode, refrigerant flows from the outdoor heat exchanger to the indoor heat exchanger. Therefore, it mainly flows through the channel with the direction from the outdoor heat exchanger to the indoor heat exchanger as the positive flow direction. The channel near the power devices is also in the positive flow direction at this time, and the refrigerant mainly flows through the channel near the power devices. The refrigerant temperature is lower than the surface temperature of the power devices, which can carry away the heat from the surface of the power devices and cool them down.

[0038] In some embodiments, the first end of the first flow channel 141 and the first end of the second flow channel 142 are respectively connected to the outdoor heat exchanger 12 through the first connecting pipe 16, the second end of the first flow channel 141 and the second end of the second flow channel 142 are respectively connected to the first end of the third flow channel 143, and the second end of the third flow channel 143 is connected to the indoor heat exchanger through the second connecting pipe 17.

[0039] That is, the forward flow direction of the first flow channel 141 can also be defined as the flow from the first connecting pipe 16 to the second connecting pipe 17, and the forward flow direction of the second flow channel 142 can also be defined as the flow from the second connecting pipe 17 to the first connecting pipe 16.

[0040] The electrical box 10 contains various power devices. Since the liquid cooling module 14 primarily dissipates heat from the power devices in the electrical box 10, and the heat dissipation efficiency is related to the contact area between the power devices and the liquid cooling module 14, in some embodiments, the power devices are divided into two categories according to their shape: a first type of power device 18 and a second type of power device 19. The contact surface between the first type of power device 18 and the liquid cooling module 14 is planar, while the contact surface between the second type of power device 19 and the liquid cooling module 14 is non-planar.

[0041] Since the contact surface between the first type of power device 18 and the liquid cooling module 14 is a plane with a large contact surface, which is conducive to heat dissipation, the first type of power device 18 and the surface of the liquid cooling module 14 can be directly contacted, which can maintain high heat exchange efficiency and improve the stability of the fixed support.

[0042] In some embodiments, such as Figure 5 As shown, the first type of power device 18 is disposed above the first flow channel 141. The first type of power device 18 can directly contact the liquid cooling module 14 in thermal contact, and the liquid cooling module 14 is a non-insulated structure. In the air conditioning heating mode, the first type of power device 18 can use its own heat to heat the temperature T1 of the nearby liquid cooling module 14 to above the dew point temperature Ts, thus preventing condensation.

[0043] In some embodiments, the second type of power device 19 is disposed adjacent to the third flow channel 143.

[0044] For the second type of power device 19, since it is difficult to have a large flat surface area, the contact area with the liquid cooling module 14 is small, which is not conducive to heat dissipation. At the same time, the small contact area is also not conducive to stable support. In order to solve the problems of heat dissipation and fixed stability of this type of power device, a recess for mounting the second type of power device 19 can be opened on the liquid cooling module 14. By embedding the second type of power device 19 into the recess, the stability of the support can be improved, and the contact area between the second type of power device 19 and the liquid cooling module 14 can be increased, thereby improving the heat dissipation efficiency.

[0045] In some embodiments, such as Figure 4 As shown, the third flow channel 143 includes a first branch 1431 and a second branch 1432 connected in parallel. The first branch 1431 and the second branch 1432 form a receiving space. A recess 144 corresponding to the second type of power device 19 is formed in the receiving space. The top of the recess 144 is open. The second type of power device 19 is disposed in the corresponding recess 144.

[0046] By dividing the third flow channel 143 into a first branch 1431 and a second branch 1432 connected in parallel, and placing the second type of power device 19 in the first branch 1431 and the second branch 1432, the refrigerant in the two branches dissipates cold energy to the surroundings, which can cool the second type of power device 19 from all sides and improve heat dissipation efficiency.

[0047] To further increase the heat dissipation area between the second type of power device 19 and the liquid cooling module 14, a thermally conductive material is filled in the gap between the second type of power device 19 and the recess. The thermally conductive material can completely wrap around the sides and bottom of the second type of power device 19 and is in contact with the inner surface of the recess 144, which can quickly conduct the heat of the second type of power device 19 to the liquid cooling module 14, thereby increasing the heat conduction area between the second type of power device 19 and the liquid cooling module 14.

[0048] This solution is designed and assembled based on the characteristics of the two types of power devices, so as to achieve both stable fixation and improved heat dissipation efficiency.

[0049] In some embodiments, the first flow channel 141 has a forward flow direction from the outdoor heat exchanger 12 to the indoor heat exchanger. Therefore, the first type of power device 18 is arranged adjacent to the first flow channel 141. In the air conditioning heating mode, the refrigerant temperature is lower than the ambient temperature. The refrigerant flows from the indoor heat exchanger to the outdoor heat exchanger 12 through the liquid cooling module 14. Therefore, the first flow channel 141 is in a counter-current flow direction. When the refrigerant flows through the first flow channel 141, it is throttled, the flow rate decreases, and the convective thermal resistance increases. The small amount of refrigerant and the increase in convective thermal resistance can reduce the heat absorption of the refrigerant around the flow channel. The first type of power device 18 can use its own heat to heat the temperature of the nearby liquid cooling module to above the dew point temperature, thereby preventing condensation on the liquid cooling module and protecting the first type of power device 18 from corrosion by condensation. At the same time, the heat generated by the power device is carried away, achieving the purpose of cooling the first type of power device 18 and extending its service life.

[0050] In air conditioning cooling mode, the refrigerant flows from the outdoor heat exchanger to the indoor heat exchanger. Therefore, it mainly flows through the flow channel with the direction from the outdoor heat exchanger to the indoor heat exchanger as the positive flow direction. The first flow channel 141 is in the positive flow direction at this time. The first type of power device 18 is close to the first flow channel 141. Since the temperature of the refrigerant is lower than the surface temperature of the first type of power device 18, it can carry away the heat from the surface of the first type of power device 18, thus achieving the effect of cooling the first type of power device 18.

[0051] The unidirectional throttling structure employs a specific design to achieve normal flow in the forward direction and throttling in the reverse direction. In some embodiments, the unidirectional throttling structure can be implemented using a Tesla valve structure.

[0052] likeFigure 4 As shown, one end of the first flow channel 141 is connected to the outdoor heat exchanger through the first connecting pipe 16, and the other end is connected to the third flow channel 143. The other end of the third flow channel 143, which is opposite to the first flow channel 141, is connected to the indoor heat exchanger through the second connecting pipe 17.

[0053] like Figure 8 , Figure 9 The diagram illustrates the movement of fluid within a Tesla valve in the forward flow direction. When the airflow passes through the Tesla valve in the forward direction, it means the airflow enters from the left side and exits from the right side.

[0054] like Figure 10 As shown, when the fluid flows through the Tesla valve in the opposite direction, that is, the airflow enters from the left side of the Tesla valve, the airflow separates at point B. Part of the fluid reaches point A through the arc path between B and A, while the remaining part of the fluid reaches point A through the straight path between B and A. The two airflows meet at point A. The gas flowing along the arc path has a component facing to the right. The two airflows have similar mass and flow in almost opposite directions, which will cancel each other out. Therefore, most of the fluid will not be able to flow out from the left side of the Tesla valve, and only a small amount will be able to flow out from the left side.

[0055] Tesla valves cannot achieve complete unidirectional shut-off. This solution utilizes this characteristic by setting up a first flow channel 141 and a second flow channel 142 in parallel. Regardless of the direction from which the refrigerant flows into the liquid cooling module 14, the refrigerant is automatically split into two paths through the first flow channel 141 and the second flow channel 142. One path has a larger flow and the other has a smaller flow. Based on the characteristics of refrigerant temperature and ambient temperature during cooling and heating operations, a first type of power device is set up to achieve good heat dissipation of the power device and avoid the technical problem of condensation.

[0056] In some embodiments, the one-way throttling structure can also be implemented using a throttling valve. When the one-way throttling structure is a throttling valve, the opening of the throttling valve is fully open when the refrigerant flows in the forward direction, and the opening of the throttling valve is reduced when the refrigerant flows in the reverse direction.

[0057] In some embodiments, such as Figure 5 , Figure 6 As shown, several turbulence structures 1411 protrude from the inner wall of the first flow channel 141, and the multiple turbulence structures 1411 are arranged in an alternating manner and extend in the flow direction of the refrigerant.

[0058] In some embodiments, the turbulence structure 1411 is a quadrangular prism with a rhomboid cross-section in the horizontal direction, and the long diagonal of the rhomboid is arranged in the direction of refrigerant flow.

[0059] By setting a rhomboid turbulence structure, when the refrigerant flows through the turbulence structure 1411 in the air conditioning cooling mode, the turbulence of the refrigerant is increased by the rhomboid turbulence structure, which greatly reduces the convective thermal resistance, and can achieve good heat dissipation of power devices, avoiding burnout of the devices.

[0060] In some embodiments, such as Figure 3 , Figure 7 As shown, an isolation groove 146 is formed between the first flow channel 141 and the second flow channel 142. The isolation groove 146 extends parallel to the extension direction of the first flow channel 141 and the second flow channel 142, and a phase change material is disposed in the isolation groove 146. At high temperatures, the phase change material completely fills the isolation groove 146, achieving a thermal connection between the first flow channel 141 and the second flow channel 142, thus improving the heat dissipation of the power device. At low temperatures, the phase change material shrinks significantly, and the first flow channel 141 and the second flow channel 142 are no longer connected by the phase change material, achieving a thermal insulation effect and improving the condensation problem of the power device.

[0061] Since the first type of power device 18 is not insulated, in order to prevent the accumulated condensate from corroding the first type of power device 18, in some embodiments, the liquid cooling module has a step 145 protruding at least at a position corresponding to the first flow channel 141, and the first type of power device 18 is disposed on the step surface. After the condensate forms, it gathers below the step, which can avoid corrosion of the first type of power device 18.

[0062] In order to ensure that the refrigerant in the first flow channel 141 can use its own heat to heat the surroundings and achieve the function of preventing condensation, in some embodiments, the step 145 is made of a thermally conductive material.

[0063] In some embodiments, the parallel flow channel is connected to the outdoor heat exchanger 12 through the first connecting pipe 16, and the third flow channel 143 is connected to the indoor heat exchanger through the second connecting pipe 17. The first connecting pipe 16 and the second connecting pipe 17 are located on the same side of the liquid cooling module 14, which can extend the path of the internal pipeline of the liquid cooling module 14 and improve the heat dissipation effect.

[0064] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by the present invention.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0066] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. An air conditioning system, comprising a compressor, an indoor heat exchanger, and an outdoor heat exchanger, wherein the compressor, indoor heat exchanger, and outdoor heat exchanger are connected via a four-way valve to form a refrigerant circulation loop, characterized in that, The air conditioning system also includes: A liquid-cooled module is located near the electrical box. The liquid-cooled module has a first flow channel, a second flow channel, and a third flow channel. The first and second flow channels are connected in parallel to form a parallel flow channel, which is connected in series with the third flow channel. The other end of the parallel flow channel is connected to the outdoor heat exchanger, and the other end of the third flow channel is connected to the indoor heat exchanger. The first and second flow channels are respectively provided with a one-way throttling structure. The one-way throttling structure has a forward flow direction and a reverse flow direction. The forward flow direction of the first flow channel is opposite to that of the second flow channel. When the refrigerant flows in the forward flow direction, it flows normally. When it flows in the reverse flow direction, it is throttled. A power device is disposed within the electrical box, and the power device is disposed adjacent to a flow channel that flows from the outdoor heat exchanger to the indoor heat exchanger in the positive direction.

2. The air conditioning system according to claim 1, characterized in that, The first end of the first flow channel and the first end of the second flow channel are respectively connected to the outdoor heat exchanger through the first connecting pipe. The second end of the first flow channel and the second end of the second flow channel are respectively connected to the first end of the third flow channel. The second end of the third flow channel is connected to the indoor heat exchanger through the second connecting pipe. The power devices include a first type of power device and a second type of power device. The contact surface between the first type of power device and the liquid cooling module is planar, while the contact surface between the second type of power device and the liquid cooling module is non-planar. The first type of power device is disposed adjacent to the first flow channel, and the second type of power device is disposed adjacent to the third flow channel.

3. The air conditioning system according to claim 1, characterized in that, The one-way throttling structure is a Tesla valve structure or a throttling valve. When the one-way throttling structure is a throttling valve, the opening of the throttling valve is fully open when the refrigerant flows in the forward direction, and the opening of the throttling valve is reduced when the refrigerant flows in the reverse direction.

4. The air conditioning system according to claim 2, characterized in that, The third flow channel includes a first branch and a second branch connected in parallel. A receiving space is formed between the first branch and the second branch. A recessed portion corresponding to the second type of power device is formed in the receiving space. The second type of power device is disposed in the corresponding recessed portion, and the gap between the second type of power device and the recessed portion is filled with thermally conductive material.

5. The air conditioning system according to claim 2, characterized in that, The inner wall of the first flow channel has several protruding turbulence structures, which are arranged in an alternating manner and extend in the direction of refrigerant flow.

6. The air conditioning system according to claim 5, characterized in that, The turbulence structure is a quadrangular prism, and the cross-section of the quadrangular prism in the horizontal direction is rhomboid, with the long diagonal of the rhomboid aligned with the direction of refrigerant flow.

7. The air conditioning system according to any one of claims 1-6, characterized in that, An isolation groove is provided between the first flow channel and the second flow channel. The isolation groove extends in a direction parallel to the extension of the first flow channel and the second flow channel, and a phase change material is disposed in the isolation groove.

8. The air conditioning system according to claim 2, characterized in that, The liquid cooling module has a step protruding at least at a position corresponding to the first flow channel, and the first type of power device is disposed on the step surface.

9. The air conditioning system according to claim 8, characterized in that, The steps are made of a thermally conductive material.

10. The air conditioning system according to any one of claims 1-6, characterized in that, The parallel flow channel is connected to the outdoor heat exchanger via a first connecting pipe, and the third flow channel is connected to the indoor heat exchanger via a second connecting pipe. The first connecting pipe and the second connecting pipe are located on the same side of the liquid cooling module.

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