Air conditioner heat exchange system and air conditioner

Abstract

The utility model provides an air conditioner heat exchange system and an air conditioner, the air conditioner heat exchange system comprises a compressor, a four-way valve, an outdoor heat exchanger, a first electronic expansion valve, an indoor heat exchanger, a frequency conversion controller and a heat exchange unit, an exhaust port of the compressor is connected with a first inlet of the four-way valve, and an air return port of the compressor is connected with a first outlet of the four-way valve; a first end of a first heat exchange tube of the outdoor heat exchanger is connected with a first transfer port of the four-way valve, a first connector of the first electronic expansion valve is connected with a second end of the first heat exchange tube, and a first end of a second heat exchange tube of the indoor heat exchanger is connected with a second connector of the first electronic expansion valve. The second end of the second heat exchange pipe is connected with a second transfer port of the four-way valve, and the variable frequency controller is electrically connected with the compressor and the first electronic expansion valve; the air conditioner is provided with the air conditioner heat exchange system, and the air conditioner heat exchange system can cool the frequency conversion controller and the compressor through the heat exchange unit of the air conditioner heat exchange system and recover heat generated by the frequency conversion controller and the compressor.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to an air conditioning heat exchange system and an air conditioner provided with the air conditioning heat exchange system. Background Art

[0002] When the variable frequency air conditioner is turned on and running, its variable frequency controller and compressor will generate a lot of heat; therefore, when the traditional variable frequency air conditioner is running in cooling mode, it will rely on the circulating air generated by the outdoor fan to cool the variable frequency controller. However, when the outdoor ambient temperature is high, the cooling effect of the variable frequency controller will deteriorate, resulting in poor operating stability of the variable frequency controller and the compressor, and in severe cases, the variable frequency air conditioner and the compressor may shut down; and when the traditional variable frequency air conditioner is running in heating mode, since the outdoor ambient temperature is not high, the variable frequency controller and the compressor can work relatively stably, but the large amount of heat generated by the variable frequency controller and the compressor cannot be effectively recycled. Summary of the invention

[0003] In order to solve the above problems, the main purpose of the utility model is to provide an air conditioning heat exchange system which can effectively cool down a frequency conversion controller and a compressor, and can recover heat from the frequency conversion controller and the compressor.

[0004] Another object of the utility model is to provide an air conditioner equipped with the above air conditioning heat exchange system.

[0005] In order to achieve the main purpose of the utility model, the utility model provides an air conditioning heat exchange system, including a compressor, a four-way valve, an outdoor heat exchanger, a first electronic expansion valve, an indoor heat exchanger and a frequency conversion controller, the exhaust port of the compressor is connected to the first inlet of the four-way valve, the return air port of the compressor is connected to the first outlet of the four-way valve, the first end of the first heat exchange tube of the outdoor heat exchanger is connected to the first transfer port of the four-way valve, the first interface of the first electronic expansion valve is connected to the second end of the first heat exchange tube, the first end of the second heat exchange tube of the indoor heat exchanger is connected to the second interface of the first electronic expansion valve, the second end of the second heat exchange tube is connected to the second transfer port of the four-way valve, and the frequency conversion controller is respectively connected to the compressor, the first electronic expansion valve, and the second electronic expansion valve. The valve is electrically connected, wherein the air conditioning heat exchange system also includes a heat exchange unit, the heat exchange unit includes a third heat exchange tube, a first one-way valve, a second one-way valve, a heat recovery device and a throttling element, the third heat exchange tube is adjacent to the frequency conversion controller, the second inlet of the first one-way valve is connected to the second end of the first heat exchange tube, the second outlet of the first one-way valve is connected to the third inlet of the third heat exchange tube, the fourth inlet of the second one-way valve is connected to the second interface, the fourth outlet of the second one-way valve is connected to the third inlet, the heat recovery device is installed on the shell of the compressor, the fifth outlet of the heat recovery device is connected to the return air port, the third interface of the throttling element is connected to the third outlet of the third heat exchange tube, and the fourth interface of the throttling element is connected to the fifth inlet of the heat recovery device.

[0006] As can be seen from the above, by setting up the heat exchange unit, when the air-conditioning heat exchange system is in the cooling mode, the heat exchange unit can first introduce the high-pressure medium-temperature refrigerant flowing out of the outdoor heat exchanger into the third heat exchange tube, and then cool the frequency conversion controller through the third heat exchange tube to prevent condensation or even frost from occurring at the frequency conversion controller, and then guide the refrigerant flowing out of the third heat exchange tube to the throttling element for throttling, so that the throttled refrigerant flows into the heat recovery device, and the compressor is better cooled and cooled through the heat recovery device, and finally the refrigerant flowing out of the heat exchange unit flows out in the form of gas. Into the return air port of the compressor; when the air conditioning heat exchange system is in heating mode, the heat exchange unit can introduce the high-pressure medium-temperature refrigerant flowing out of the indoor heat exchanger into the third heat exchange tube, and then absorb the heat generated by the frequency conversion controller through the third heat exchange tube and cool the frequency conversion controller to a certain extent, and then lead the refrigerant flowing out of the third heat exchange tube to the throttling element for a certain degree of throttling, and the throttled refrigerant is better absorbed by the heat recovery device for the heat generated by the compressor, thereby increasing the heating capacity of the air conditioning heat exchange system and improving energy efficiency.

[0007] A preferred solution is that the throttling element is a capillary tube.

[0008] It can be seen from the above that using a capillary tube as a throttling element can simplify the control difficulty of the air-conditioning heat exchange system and reduce the cost of the air-conditioning heat exchange system.

[0009] Another preferred solution is that the throttling element is a second electronic expansion valve, and the second electronic expansion valve is electrically connected to the frequency conversion controller.

[0010] As can be seen from the above, the use of the second electronic expansion valve as a throttling element can enable the heat exchange unit to better cool the frequency converter and the compressor when the air-conditioning heat exchange system operates in the cooling mode; and to better absorb the heat of the frequency converter and the compressor when the air-conditioning heat exchange system operates in the heating mode; thereby, the heat exchange unit can be dynamically adjusted according to the operating conditions of the air-conditioning heat exchange system to ensure its cooling and heat recovery effects.

[0011] A further solution is that the heat exchange unit also includes a first temperature sensing tube and a second temperature sensing tube, the first temperature sensing tube is arranged at the fifth inlet, the second temperature sensing tube is arranged at the fifth outlet, and the first temperature sensing tube and the second temperature sensing tube are electrically connected to the frequency conversion controller respectively.

[0012] It can be seen from the above that the first temperature sensing tube and the second temperature sensing tube can assist the frequency conversion controller to better control the heat exchange unit, so as to perform more optimized dynamic adjustment on the heat exchange unit and improve the cooling and heat recovery effects of the heat exchange unit.

[0013] A further solution is that the heat exchange unit further includes a third temperature sensing tube, the third temperature sensing tube is arranged at the first shell of the compressor, and the third temperature sensing tube is electrically connected to the frequency conversion controller.

[0014] As can be seen from the above, the setting of the third temperature sensing tube enables the frequency conversion controller to better regulate the heat exchange unit in combination with the temperature of the compressor, and to provide stronger protection for the compressor to prevent the compressor temperature from being too low or too high, while ensuring the stability and reliability of the air conditioning heat exchange system.

[0015] A further solution is that the air conditioning heat exchange system also includes an air replenishment and reheat increase unit, which includes a third electronic expansion valve and an economizer, the third electronic expansion valve is electrically connected to the frequency conversion controller, the fifth interface of the third electronic expansion valve is connected to the first end of the second heat exchange tube, the economizer includes a second shell and a fourth heat exchange tube, the second shell has a heat exchange cavity and a sixth inlet and a sixth outlet connected to the heat exchange cavity, the sixth inlet is connected to the sixth interface of the third electronic expansion valve, the sixth outlet is connected to the air replenishment port of the compressor, the fourth heat exchange tube is arranged in the heat exchange cavity, and the fourth heat exchange tube is connected between the second interface and the fifth interface.

[0016] It can be seen from the above that by providing an air replenishment and enthalpy increase unit, the heating capacity of the air-conditioning heat exchange system can be improved, and the air-conditioning heat exchange system can adapt to a lower outdoor ambient temperature.

[0017] A further solution is that the air conditioning heat exchange system also includes a first stop valve and a second stop valve, the first stop valve is connected between the fifth interface and the second heat exchange tube, and the second stop valve is connected between the second heat exchange tube and the second transfer port.

[0018] As can be seen from the above, the provision of the first stop valve and the second stop valve makes the maintenance of the air conditioning heat exchange system more convenient, while preventing the refrigerant in the air conditioning heat exchange system from incorrectly flowing back, and realizing the flow control of the refrigerant in the air conditioning heat exchange system.

[0019] A further solution is that the frequency conversion controller includes a body and a third shell, the body and the third heat exchange tube are both mounted on the third shell, and the third heat exchange tube is adjacent along the body.

[0020] As can be seen from the above, this design allows the refrigerant in the third heat exchange tube to better exchange heat with the body of the frequency conversion controller, so as to ensure the cooling and heat absorption effect of the frequency conversion controller.

[0021] A further solution is that a heat exchange block is arranged in the third shell, the heat exchange block is adjacent to the main body, and the third heat exchange tube is installed between the heat exchange block and the main body.

[0022] It can be seen from the above that the setting of the heat exchange block can increase the heat exchange area between the frequency conversion controller and the third heat exchange tube, thereby further improving the cooling and heat absorption effect of the heat exchange unit on the frequency conversion controller.

[0023] In order to achieve another purpose of the utility model, the utility model provides an air conditioner, including an indoor case and an outdoor case, which also includes the above-mentioned air conditioning heat exchange system, the indoor heat exchanger is arranged in the indoor case, and the compressor, four-way valve, outdoor heat exchanger, first electronic expansion valve, frequency conversion controller and heat exchange unit are all arranged in the outdoor case.

[0024] As can be seen from the above, the air conditioner equipped with the above-mentioned air conditioning heat exchange system can cool down the frequency conversion controller and the compressor when operating in the cooling mode, thereby ensuring the reliability and stability of the air conditioner; and when operating in the heating mode, the heat generated by the frequency conversion controller and the compressor can be recycled to enhance the heating capacity of the air conditioner, thereby improving the energy efficiency of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a system operation principle diagram of the first embodiment of the air conditioning heat exchange system of the utility model when it operates in the cooling mode.

[0026] Figure 2 It is a schematic diagram of the connection structure between the frequency conversion controller and the third heat exchange tube of the first embodiment of the air conditioning heat exchange system of the utility model.

[0027] Figure 3 This is a system operation principle diagram of the first embodiment of the air conditioning heat exchange system of the utility model when it operates in the heating mode.

[0028] Figure 4 This is a system operation principle diagram of the second embodiment of the air conditioning heat exchange system of the utility model when it operates in the cooling mode.

[0029] Figure 5 It is a system schematic diagram of the second embodiment of the air conditioning heat exchange system of the utility model.

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0031] First embodiment of air conditioning heat exchange system

[0032] Reference Figure 1 The air conditioning heat exchange system 100 includes a compressor 11, a four-way valve 12, an outdoor heat exchanger 13, a first electronic expansion valve 14, an indoor heat exchanger 15, a frequency conversion controller 16, a heat exchange unit 17, a first stop valve 181 and a second stop valve 182. The frequency conversion controller 16 is electrically connected to the compressor 11, the four-way valve 12 and the first electronic expansion valve 14 respectively.

[0033] The exhaust port of the compressor 11 is connected to the first inlet of the four-way valve 12, and the return air port of the compressor 11 is connected to the first outlet of the four-way valve 12. The outdoor heat exchanger 13 has a plurality of first fins and a first heat exchange tube. The plurality of first fins are distributed along the thickness direction thereof. The first heat exchange tube is in a winding shape, and the first heat exchange tube runs through each first fin to increase the heat exchange area between the first heat exchange tube and the refrigerant flowing therein and the outdoor air, thereby improving the heat exchange effect of the outdoor heat exchanger 13 and the refrigerant therein. The first end of the first heat exchange tube of the outdoor heat exchanger 13 is connected to the first transit port of the four-way valve 12, and the first interface of the first electronic expansion valve 14 is connected to the second end of the first heat exchange tube of the outdoor heat exchanger 13.

[0034] The indoor heat exchanger 15 has a plurality of second fins and a second heat exchange tube, the plurality of second fins are distributed along the thickness direction thereof, the second heat exchange tube is in a winding shape, and the second heat exchange tube runs through each second fin to increase the heat exchange area between the second heat exchange tube and the refrigerant flowing therein and the indoor air, thereby improving the heat exchange effect of the indoor heat exchanger 15 and the refrigerant therein. The first end of the second heat exchange tube of the indoor heat exchanger 15 is connected to the second interface of the first electronic expansion valve 14, and the second end of the second heat exchange tube of the indoor heat exchanger 15 is connected to the second transfer port of the four-way valve 12.

[0035] When the air conditioning heat exchange system 100 operates in cooling mode, the frequency conversion controller 16 controls the first inlet of the four-way valve 12 to communicate with the first transfer port; at this time, the first outlet of the four-way valve 12 is connected to the second transfer port. When the air conditioning heat exchange system 100 operates in heating mode, the frequency conversion controller 16 controls the first inlet of the four-way valve 12 to communicate with the second transfer port; at this time, the first outlet of the four-way valve 12 is connected to the first transfer port.

[0036] The heat exchange unit 17 includes a third heat exchange tube 171, a first one-way valve 172, a second one-way valve 173, a heat recovery device 174 and a throttling element; wherein the third heat exchange tube 171 is adjacent to the frequency conversion controller 16, so that the third heat exchange tube 171 and the refrigerant flowing therethrough can exchange heat with the frequency conversion controller 16, thereby cooling the frequency conversion controller 16 and absorbing the heat generated by the frequency conversion controller 16.

[0037] The second inlet of the first one-way valve 172 is connected to the second end of the first heat exchange tube of the outdoor heat exchanger 13, and the second outlet of the first one-way valve 172 is connected to the third inlet of the third heat exchange tube 171, so that when the air-conditioning heat exchange system 100 operates in the cooling mode, the refrigerant flowing out of the first heat exchange tube of the outdoor heat exchanger 13 can be divided into two paths, one path enters the second heat exchange tube of the indoor heat exchanger 15 through the first electronic expansion valve 14 to exchange heat with the indoor air, and the other path enters the third heat exchange tube 171 through the first one-way valve 172 to exchange heat with the frequency conversion controller 16.

[0038] The fourth inlet of the second one-way valve 173 is connected to the second interface of the first electronic expansion valve 14, and the fourth outlet of the second one-way valve 173 is connected to the third inlet of the third heat exchange tube 171, so that when the air-conditioning heat exchange system 100 operates in the heating mode, the refrigerant flowing out of the second heat exchange tube of the indoor heat exchanger 15 can be divided into two paths, one path enters the first heat exchange tube of the outdoor heat exchanger 13 through the first electronic expansion valve 14 to exchange heat with the outdoor air, and the other path enters the third heat exchange tube 171 through the first one-way valve 172 to exchange heat with the frequency conversion controller 16.

[0039] Preferably, if Figure 2 As shown, the frequency conversion controller 16 includes a body 161 and a third shell 162, wherein the body 161 is electrically connected to the compressor 11, the four-way valve 12 and the first electronic expansion valve 14. In addition, the body 161 and the third heat exchange tube 171 are both installed on the third shell 162, and the third heat exchange tube 171 is adjacent to the body 161 to ensure the effect of heat exchange between the refrigerant in the third heat exchange tube 171 and the body 161 of the frequency conversion controller 16, so as to cool the frequency conversion controller 16 and absorb heat. Furthermore, a heat exchange block 163 is provided in the third shell 162, the heat exchange block 163 is adjacent to the main body 161, and the third heat exchange tube 171 is installed on the heat exchange block 163. The setting of the heat exchange block 163 can increase the heat exchange area between the main body 161 of the frequency conversion controller 16 and the third heat exchange tube 171, thereby further improving the cooling and heat absorption effect of the heat exchange unit 17 on the frequency conversion controller 16; in addition, fins can also be provided on the heat exchange block 163 to enhance the cooling and temperature reduction effect on the frequency conversion controller 16.

[0040] The heat recovery device 174 is installed on the outer shell of the compressor 11 to recover the heat generated by the compressor 11. The heat recovery device 174 can be a fifth heat exchange tube, and the fifth heat exchange tube is spirally wound on the outside of the compressor 11, so that the refrigerant flowing through the fifth heat exchange tube can better absorb the heat generated by the compressor 11, thereby cooling the compressor 11 and recovering the heat generated by the compressor 11; of course, as another optional solution, the heat recovery device 174 can also be a combination structure of the third fin and the sixth heat exchange tube, and the heat recovery device 174 is arranged in close contact with the outer shell of the compressor 11, so that the refrigerant flowing through the fifth heat exchange tube can better absorb the heat generated by the compressor 11; furthermore, the heat recovery device 174 can also be other structures, and the structure can be passed by the refrigerant, so that the refrigerant and the compressor 11 can exchange heat.

[0041] In addition, the fifth outlet of the heat recovery device 174 (such as the outlet of the fifth heat exchange tube, the outlet of the sixth heat exchange tube, etc.) is connected to the return air port of the compressor 11, so that the refrigerant after heat exchange with the compressor 11 can flow back to the mainstream path, and then merge with the refrigerant participating in the refrigeration or heating cycle in the mainstream path, and then be sucked into the compressor 11 by the return air port of the compressor 11 and compressed again.

[0042] The third interface of the throttling element is connected to the outlet of the third heat exchange tube 171, and the fourth interface of the throttling element is connected to the fifth inlet (such as the inlet of the fifth heat exchange tube, the inlet of the sixth heat exchange tube, etc.) of the heat recovery device 174. The throttling element can throttle the refrigerant after heat exchange with the frequency conversion controller 16 to a certain extent, so that the refrigerant can better absorb the heat generated by the compressor 11 and cool the compressor 11.

[0043] In this embodiment, the throttling element is the second electronic expansion valve 175, and the second electronic expansion valve 175 is connected to the frequency conversion controller 16, so that the frequency conversion controller 16 can adjust the opening of the second electronic expansion valve 175. The second electronic expansion valve 175 is used as a throttling element so that the heat exchange unit 17 can better cool the frequency conversion controller 16 and the compressor 11 when the air conditioning heat exchange system 100 operates in the cooling mode; and when the air conditioning heat exchange system 100 operates in the heating mode, it can better absorb the heat of the frequency conversion controller 16 and the compressor 11; so that the heat exchange unit 17 can be dynamically adjusted according to the working conditions of the air conditioning heat exchange system 100 to ensure its cooling and heat recovery effects.

[0044] Preferably, the heat exchange unit 17 further includes a first temperature sensing tube 176 and a second temperature sensing tube 177, and the first temperature sensing tube 176 and the second temperature sensing tube 177 are electrically connected to the frequency conversion controller 16 respectively. The first temperature sensing tube 176 is arranged at the fifth inlet to detect the temperature of the refrigerant flowing into the heat recovery device 174; the second temperature sensing tube 177 is arranged at the fifth outlet to detect the temperature of the refrigerant flowing out of the heat recovery device 174. The arrangement of the first temperature sensing tube 176 and the second temperature sensing tube 177 enables the frequency conversion controller 16 to adjust the opening of the second electronic expansion valve 175 through the temperature difference between the first temperature sensing tube 176 and the second temperature sensing tube 177, so as to keep the compressor 11 at a better working temperature, thereby ensuring the reliability of the compressor 11 and protecting the compressor 11. It can be seen that the first temperature sensing tube 176 and the second temperature sensing tube 177 can assist the frequency conversion controller 16 to better control the heat exchange unit 17, so as to optimize the dynamic adjustment of the heat exchange unit 17, thereby improving the cooling and heat recovery effects of the heat exchange unit 17.

[0045] Furthermore, the heat exchange unit 17 further includes a third temperature sensing tube 178, which is disposed at the first housing of the compressor 11 and is electrically connected to the frequency conversion controller 16. The third temperature sensing tube 178 is used to detect the temperature of the compressor 11 in real time, so that the frequency conversion controller 16 can further adjust the heat exchange unit 17 more accurately in combination with the temperature of the compressor 11, thereby preventing the temperature of the compressor 11 from being too low or too high, thereby further ensuring the reliability of the operation of the compressor 11 and providing stronger protection for the compressor 11.

[0046] The first stop valve 181 is connected between the first electronic expansion valve 14 and the indoor heat exchanger 15, and the second stop valve 182 is connected between the second heat exchange pipe and the second transfer port of the four-way valve 12. The provision of the first stop valve 181 and the second stop valve 182 makes the maintenance of the air conditioning heat exchange system 100 more convenient, and can prevent the refrigerant in the air conditioning heat exchange system 100 from incorrectly backflowing, and can realize the flow control of the refrigerant in the air conditioning heat exchange system 100.

[0047] like Figure 1 As shown, when the air conditioning heat exchange system 100 operates in the cooling mode, the high-pressure and high-temperature gaseous refrigerant discharged from the exhaust port of the compressor 11 enters the first inlet of the four-way valve 12 and enters the outdoor heat exchanger 13 through the first transfer port of the four-way valve 12. Then, the refrigerant is condensed into a high-pressure and medium-temperature liquid refrigerant by the outdoor heat exchanger 13 and flows out of the outdoor heat exchanger 13. Next, the high-pressure and medium-temperature liquid refrigerant is divided into two paths. One path still enters the first electronic expansion valve 14 along the main flow path, is throttled to a low-pressure and low-temperature liquid refrigerant, and then enters the indoor heat exchanger 15. Then, it is evaporated by the indoor heat exchanger 15 to form a low-pressure and low-temperature gaseous refrigerant and then flows back to the second transfer port of the four-way valve 12, and finally enters the return air port of the compressor 11 through the first outlet of the four-way valve 12; the other path of refrigerant enters the third heat exchange tube 171 through the first one-way valve 172 and heat exchanges with the frequency conversion controller 16 to cool the frequency conversion controller 16, and then the refrigerant flows to the second electronic expansion valve 175 and is throttled by the second electronic expansion valve 175, and then the refrigerant flows to the heat recovery device 174 to heat exchange with the compressor 11 to cool the compressor 11 and be evaporated into a gaseous state, and finally flows back to the main flow path and merges with the refrigerant in the main flow path and enters the return air port of the compressor 11. Since the refrigerant pressure at the fourth inlet of the second one-way valve 173 is lower than the refrigerant pressure at the fourth outlet thereof, no refrigerant flows through the second one-way valve 173 when the air conditioning heat exchange system 100 operates in the cooling mode.

[0048] When the air conditioning heat exchange system 100 is operated in the cooling mode, the refrigerant used by the frequency conversion controller 16 for cooling is always guaranteed to be high pressure and medium temperature (in this state, the refrigerant temperature is still lower than the working temperature of the frequency conversion controller 16, so the condition for cooling the frequency conversion controller 16 is met), avoiding the refrigerant being lower than the ambient dew point temperature, so that no condensation occurs when the frequency conversion controller 16 is cooled, and the reliability of the operation of the frequency conversion controller 16 is guaranteed; in addition, the refrigerant after cooling the frequency conversion controller 16 no longer participates in the circulation of the mainstream path, thereby avoiding the reduction of the supercooling degree of the refrigerant in the mainstream path, and preventing the reduction of the refrigeration capacity of the air conditioning heat exchange system 100. Furthermore, the refrigerant after cooling the frequency conversion controller 16 first passes through the throttling of the throttling element (such as the second electronic expansion valve 175 in this embodiment), and then flows into the heat recovery device 174 to perform heat exchange along the compressor 11 and be evaporated, so that the compressor 11 can be cooled well, so that the compressor 11 is always in a low-temperature and efficient operation state, so that the air conditioning heat exchange system 100 can operate efficiently. In addition, since the frequency conversion controller 16 and the compressor 11 are effectively cooled, the air conditioning heat exchange system 100 can continue to provide powerful cooling without tripping at a higher outdoor ambient temperature, which greatly improves the high-temperature cooling capacity of the air conditioning heat exchange system 100.

[0049] like Figure 3 As shown, when the air conditioning heat exchange system 100 operates in the heating mode, the high-pressure and high-temperature gaseous refrigerant discharged from the exhaust port of the compressor 11 enters the first inlet of the four-way valve 12 and enters the indoor heat exchanger 15 through the second transfer port of the four-way valve 12. Then, the refrigerant is condensed into a high-pressure and medium-temperature liquid refrigerant by the indoor heat exchanger 15 and flows out of the indoor heat exchanger 15. Next, the high-pressure medium-temperature liquid refrigerant is divided into two paths, one path still enters the first electronic expansion valve 14 along the main flow path, is throttled to a low-pressure and low-temperature liquid refrigerant, and then enters the outdoor heat exchanger 13, and then is evaporated by the outdoor heat exchanger 13 to form a low-pressure and low-temperature gaseous refrigerant and then flows back to the first transfer port of the four-way valve 12, and finally enters the return air port of the compressor 11 through the first outlet of the four-way valve 12; the other path of refrigerant enters the third heat exchange pipe 171 through the second one-way valve 173 and heat exchanges with the frequency conversion controller 16 to absorb the heat of the frequency conversion controller 16 and cool the frequency conversion controller 16 to a certain extent, and then the refrigerant flows to the second electronic expansion valve 175 and is throttled by the second electronic expansion valve 175, and then the refrigerant flows to the heat recovery device 174 to heat exchange with the compressor 11 to absorb the heat of the compressor 11 and cool the compressor 11 to a certain extent, so that it is evaporated into a gaseous state and flows back to the main flow path to merge with the refrigerant in the main flow path and enter the return air port of the compressor 11. Since the refrigerant pressure at the second inlet of the first one-way valve 172 is lower than the refrigerant pressure at the second outlet thereof, no refrigerant flows through the first one-way valve 172 when the air conditioning heat exchange system 100 operates in the heating mode.

[0050] When the air conditioning heat exchange system 100 operates in the heating mode, the heat exchange unit 17 absorbs all the heat of the frequency conversion controller 16 and the heat of the compressor 11 and converts them to the indoor side for heating. Therefore, in the heating mode, the air conditioning heat exchange system 100 also achieves the effect of increasing the heating amount and improving energy efficiency.

[0051] From the above, it can be seen that when the air conditioning heat exchange system 100 operates in the cooling mode, the temperature of the frequency conversion controller 16 is effectively reduced through the high-pressure medium-temperature refrigerant, and it is ensured that the frequency conversion controller 16 does not condense when the temperature is lowered, ensuring the operational reliability of the frequency conversion controller 16 (if condensation occurs during cooling, the safety of the electrical parts will be greatly reduced); at the same time, the temperature of the compressor 11 is also greatly reduced, thereby ensuring the reliability of the refrigeration operation of the air conditioning heat exchange system 100 under high outdoor ambient temperature, and reducing the power of the compressor 11 and improving the energy efficiency of the refrigeration operation. In addition, when the air conditioning heat exchange system 100 operates in the heating mode, the heat exchange unit 17 can effectively recover the heat generated by the frequency conversion controller 16 and the compressor 11 itself, and then send it to the indoor side after conversion, thereby reducing the power of the compressor 11 and increasing the heating amount, thereby better improving the heating energy efficiency.

[0052] Second embodiment of air conditioning heat exchange system

[0053] Reference Figure 4 The difference between this embodiment and the first embodiment of the air conditioning heat exchange system lies in the type of the throttling element. Specifically, in this embodiment:

[0054] The second electronic expansion valve is replaced with a capillary tube 179, and the first temperature sensing tube, the second temperature sensing tube and the third temperature sensing tube are eliminated. Using the capillary tube 179 as a throttling element can simplify the control difficulty of the air conditioning heat exchange system and reduce the cost of the air conditioning heat exchange system; however, its cooling and heat recovery effect on the frequency conversion controller and the compressor is poor.

[0055] Third embodiment of air conditioning heat exchange system

[0056] Reference Figure 5 The difference between this embodiment and the first embodiment or the second embodiment of the air conditioning heat exchange system is that, in this embodiment:

[0057] The air conditioning heat exchange system 200 also includes an air replenishing and reheat increasing unit 21, which includes a third electronic expansion valve 211 and an economizer 212. The third electronic expansion valve 211 is electrically connected to the frequency conversion controller 22. The fifth interface of the third electronic expansion valve 211 is connected to the first end of the second heat exchange tube of the indoor heat exchanger 23. The economizer 212 includes a second shell 2121 and a fourth heat exchange tube 2122. The second shell 2121 has a heat exchange cavity 2120 and a sixth inlet and a sixth outlet connected to the heat exchange cavity 2120. The sixth interface of the third electronic expansion valve 211 is connected to the sixth inlet, and the sixth outlet is connected to the air replenishing port 241 of the compressor 24. The fourth heat exchange tube 2122 is arranged in the heat exchange cavity 2120, and the fourth heat exchange tube 2122 is connected between the second interface of the first electronic expansion valve 25 and the fifth interface of the third electronic expansion valve 211. In addition, in this embodiment, the first stop valve 26 is connected between the fifth interface of the third electronic expansion valve 211 and the indoor heat exchanger 23. By providing the air replenishment enthalpy increase unit 21, the heating capacity of the air conditioning heat exchange system 200 can be improved, and the air conditioning heat exchange system 200 can adapt to a lower outdoor ambient temperature.

[0058] Air Conditioner Embodiment

[0059] The air conditioner includes an indoor case, an outdoor case and an air conditioning heat exchange system; wherein the air conditioning heat exchange system is the air conditioning heat exchange system described in any one of the first to third embodiments of the air conditioning heat exchange system. The indoor heat exchanger is arranged in the indoor case, and the compressor, the four-way valve, the outdoor heat exchanger, the first electronic expansion valve, the frequency conversion controller and the heat exchange unit are all arranged in the outdoor case. It can be seen that the air conditioner provided with the above-mentioned air conditioning heat exchange system can cool down the frequency conversion controller and the compressor when operating in the cooling mode, thereby ensuring the reliability and stability of the air conditioner; and when operating in the heating mode, the heat generated by the frequency conversion controller and the compressor can be recycled to improve the heating capacity of the air conditioner, thereby improving the energy efficiency of the air conditioner.

[0060] Finally, it should be emphasized that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Air conditioning heat exchange system, including: compressor; A four-way valve, wherein the exhaust port of the compressor is connected to the first inlet of the four-way valve, and the return air port of the compressor is connected to the first outlet of the four-way valve; An outdoor heat exchanger, wherein a first end of a first heat exchange tube of the outdoor heat exchanger is connected to a first transfer port of the four-way valve; a first electronic expansion valve, wherein a first interface of the first electronic expansion valve is connected to a second end of the first heat exchange tube; An indoor heat exchanger, wherein a first end of a second heat exchange tube of the indoor heat exchanger is connected to a second interface of the first electronic expansion valve, and a second end of the second heat exchange tube is connected to a second transfer port of the four-way valve; A frequency conversion controller, the frequency conversion controller is electrically connected to the compressor and the first electronic expansion valve respectively; Characteristically, the air conditioning heat exchange system further comprises a heat exchange unit, and the heat exchange unit comprises: a third heat exchange tube, wherein the third heat exchange tube is connected to the frequency conversion controller; a first one-way valve, wherein a second inlet of the first one-way valve is connected to the second end of the first heat exchange tube, and a second outlet of the first one-way valve is connected to the third inlet of the third heat exchange tube; a second one-way valve, wherein a fourth inlet of the second one-way valve is connected to the second interface, and a fourth outlet of the second one-way valve is connected to the third inlet; A heat recovery device, wherein the heat recovery device is mounted on the housing of the compressor, and a fifth outlet of the heat recovery device is connected to the air return port; A throttling element, wherein the third interface of the throttling element is connected to the third outlet of the third heat exchange tube, and the fourth interface of the throttling element is connected to the fifth inlet of the heat recovery device.

2. The air conditioning heat exchange system according to claim 1, characterized in that: The throttling element is a capillary tube.

3. The air conditioning heat exchange system according to claim 1, characterized in that: The throttling element is a second electronic expansion valve, and the second electronic expansion valve is electrically connected to the frequency conversion controller.

4. The air conditioning heat exchange system according to claim 3, characterized in that: The heat exchange unit also includes: a first temperature sensing tube, wherein the first temperature sensing tube is arranged at the fifth inlet; A second temperature sensing tube, wherein the second temperature sensing tube is arranged at the fifth outlet, and the first temperature sensing tube and the second temperature sensing tube are electrically connected to the frequency conversion controller respectively.

5. The air conditioning heat exchange system according to claim 4, characterized in that: The heat exchange unit further includes a third temperature sensing tube, which is disposed at the first shell of the compressor and is electrically connected to the frequency conversion controller.

6. The air conditioning heat exchange system according to any one of claims 1 to 5, characterized in that: The air conditioning heat exchange system further includes an air supplement and enthalpy increase unit, and the air supplement and enthalpy increase unit includes: a third electronic expansion valve, the third electronic expansion valve being electrically connected to the frequency conversion controller, and a fifth interface of the third electronic expansion valve being connected to the first end of the second heat exchange tube; An economizer, the economizer includes a second shell and a fourth heat exchange tube, the second shell has a heat exchange cavity and a sixth inlet and a sixth outlet connected to the heat exchange cavity, the sixth inlet is connected to the sixth interface of the third electronic expansion valve, the sixth outlet is connected to the air supply port of the compressor, the fourth heat exchange tube is arranged in the heat exchange cavity, and the fourth heat exchange tube is connected between the second interface and the fifth interface.

7. The air conditioning heat exchange system according to claim 6, characterized in that: The air conditioning heat exchange system also includes: a first stop valve, the first stop valve being connected between the fifth interface and the second heat exchange tube; A second stop valve is connected between the second heat exchange tube and the second transfer port.

8. The air conditioning heat exchange system according to claim 6, characterized in that: The frequency conversion controller comprises: ontology; A third shell, the body and the third heat exchange tube are both mounted on the third shell, and the third heat exchange tube is connected along the body.

9. The air conditioning heat exchange system according to claim 8, characterized in that: A heat exchange block is arranged in the third shell, the heat exchange block is adjacent to the main body, and the third heat exchange tube is installed between the main body and the heat exchange block.

10. An air conditioner, comprising an indoor casing and an outdoor casing, characterized in that: It also includes the air conditioning heat exchange system according to any one of claims 1 to 9, wherein the indoor heat exchanger is arranged in the indoor chassis, and the compressor, the four-way valve, the outdoor heat exchanger, the first electronic expansion valve, the frequency conversion controller and the heat exchange unit are all arranged in the outdoor chassis.

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