Inverter air conditioner and air conditioning heat exchange system
By designing the cooling flow path and control method of the air-conditioning heat exchange system, the problem of inverter air conditioners being difficult to cool under high temperature environments is solved, and stable operation and efficient cooling are achieved under high temperature conditions.
Patent Information
- Application Number
- CN202421280101.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-05
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-06-05
AI Technical Summary
Inverter air conditioners are difficult to effectively cool down in high temperature environments, resulting in high temperature of the inverter controller, affecting working stability and may lead to shutdown.
An air-conditioning heat exchange system is designed, including a cooling flow path, which cools the frequency converter in cooling or heating mode through high-pressure medium-temperature refrigerant, and controls the refrigerant flow through throttling elements and a check valve to simplify the control method.
Maintain strong refrigeration capacity in high temperature environments to prevent condensation from occurring in the inverter controller, improve working reliability and safety, and simplify control methods and reduce costs.
Smart Images
Figure CN222703416U_ABST
Abstract
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 a variable frequency air conditioner provided with the heat exchange system. Background Art
[0002] When a variable frequency air conditioner is turned on and running, its variable frequency controller will generate a lot of heat; traditional variable frequency air conditioners rely on the circulating air generated by the outdoor fan during operation to cool the variable frequency controller. However, when the outdoor ambient temperature is high, the circulating air generated by the outdoor fan is difficult to effectively cool the variable frequency controller, causing the temperature of the variable frequency controller to remain high, thereby affecting the operating stability of the variable frequency controller, and in severe cases may cause the variable frequency air conditioner to shut down. 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 that can effectively cool down the frequency conversion controller.
[0004] Another object of the utility model is to provide a variable frequency 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 throttling element, an indoor heat exchanger and a frequency conversion controller, the air inlet of the four-way valve is connected to the exhaust port of the compressor, the air outlet of the four-way valve is connected to the return air port of the compressor, 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 fourth end of the second heat exchange tube of the indoor heat exchanger is connected to the second transfer port of the four-way valve, the frequency conversion controller is electrically connected to the compressor and the four-way valve respectively, wherein the air conditioning heat exchange system also includes a cooling flow path, the cooling flow path includes a first branch, a second branch and a third heat exchange tube, the first branch includes a first check valve and a second check valve, the first check valve The first inlet is connected to the second end of the first heat exchange tube, the first outlet of the first one-way valve is connected to the second outlet of the second one-way valve, the second inlet of the second one-way valve is connected to the third end of the second heat exchange tube, the second branch includes a third one-way valve and a fourth one-way valve, the third outlet of the third one-way valve is connected to the second end of the first heat exchange tube, the third inlet of the third one-way valve is connected to the fourth inlet of the fourth one-way valve, the fourth outlet of the fourth one-way valve is connected to the third end of the second heat exchange tube, the third heat exchange tube is adjacent to the frequency conversion controller, the fifth inlet of the third heat exchange tube is connected between the first outlet and the second outlet, the fifth outlet of the third heat exchange tube is connected to the sixth inlet of the throttling element, and the sixth outlet of the throttling element is connected between the third inlet and the fourth inlet.
[0006] It can be seen from the above that, through the design of the air-conditioning heat exchange system and its cooling flow path, no matter whether the air-conditioning heat exchange system is in cooling mode or heating mode, the cooling flow path can cool down the frequency conversion controller through the high-pressure medium-temperature refrigerant, so that the air-conditioning heat exchange system can still maintain strong cooling without tripping at a high outdoor ambient temperature, thereby greatly improving the high-temperature heating capacity of the air-conditioning heat exchange system; in addition, since the temperature of the high-pressure medium-temperature refrigerant is higher than the ambient dew point temperature and meets the demand for cooling the frequency conversion controller, the cooling flow path can also prevent condensation from occurring in the frequency conversion controller when cooling down the frequency conversion controller, thereby ensuring the reliability and safety of the operation of the frequency conversion controller; furthermore, the cooling flow path only controls the flow direction of the refrigerant through four one-way valves, so each one-way valve of the cooling flow path can automatically control the flow direction of the refrigerant according to the high and low pressure difference of the system refrigerant, thereby eliminating the need for additional control levels, simplifying the control method of the air-conditioning heat exchange system, and improving the reliability of the operation of the air-conditioning heat exchange system.
[0007] A further solution is that the throttling element is a first electronic expansion valve, and the first electronic expansion valve is electrically connected to the frequency conversion controller; or the throttling element is a capillary tube.
[0008] It can be seen from the above that the use of the first electronic expansion valve as a throttling element can improve the temperature control accuracy of the air-conditioning heat exchange system, and at the same time is beneficial to improving the system efficiency and energy efficiency ratio, and also enables the air-conditioning heat exchange system to be applicable to various working conditions and load changes, and improves the stability and reliability of the air-conditioning heat exchange system; and the use of a capillary tube as a throttling element is beneficial to reducing the cost of the air-conditioning heat exchange system and extending the service life of the air-conditioning heat exchange system.
[0009] A further solution is that the frequency conversion controller includes a main body and a first shell, the main body and the third heat exchange tube are both mounted on the shell, and the main body is adjacent to the third heat exchange tube.
[0010] 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 effect of the frequency conversion controller.
[0011] A further solution is that a heat exchange block is provided in the first shell, the heat exchange block is adjacent to the main body, and the third heat exchange tube is installed on the heat exchange block.
[0012] It can be seen from the above that the setting of the heat exchange block can increase the heat exchange area between the frequency converter and the third heat exchange tube, improve the heat exchange efficiency, and further improve the cooling effect of the cooling flow path on the frequency converter.
[0013] A further solution is that the heat exchange block is made of aluminum, aluminum alloy or copper.
[0014] A further solution is that the air conditioning heat exchange system also includes an air replenishment and reheat increase unit, the air replenishment and reheat increase unit includes an economizer and a second electronic expansion valve, the economizer includes a second shell and a fourth heat exchange tube, the second shell has a heat exchange cavity and a seventh inlet and a seventh outlet connected to the heat exchange cavity, the seventh outlet is connected to the air replenishment port of the compressor, the fourth heat exchange tube is arranged in the heat exchange cavity, the eighth inlet of the fourth heat exchange tube is connected between the first outlet and the second outlet, the eighth outlet of the fourth heat exchange tube is connected to the fifth inlet, the second electronic expansion valve is electrically connected to the frequency conversion controller, the ninth inlet of the second electronic expansion valve is connected between the first outlet and the second outlet, and the ninth outlet of the second electronic expansion valve is connected to the seventh inlet.
[0015] It can be seen from the above that this design can better reduce the temperature of the refrigerant flowing into the third heat exchange tube, thereby enhancing the effect of lowering the temperature of the frequency conversion controller; and at the same time can improve the heating capacity of the air-conditioning heat exchange system and enable the air-conditioning heat exchange system to adapt to lower outdoor ambient temperatures.
[0016] A further solution is that the air conditioning heat exchange system also includes a first stop valve and a second stop valve, the fifth end of the first stop valve is respectively connected to the second inlet and the fourth outlet, the sixth end of the first stop valve is connected to the third end of the second heat exchange tube, and the second stop valve is connected to the fourth end of the second heat exchange tube and the second transfer port.
[0017] 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.
[0018] A further solution is that the air conditioning heat exchange system also includes an outdoor fan and an indoor fan, the outdoor fan is electrically connected to the frequency conversion controller, the outdoor fan is arranged at the outdoor heat exchanger, the indoor fan is electrically connected to the frequency conversion controller, and the indoor fan is arranged at the indoor heat exchanger.
[0019] It can be seen from the above that the outdoor fan can accelerate the air flow at the outdoor heat exchanger and improve the heat exchange effect between the refrigerant flowing through the outdoor heat exchanger and the outdoor air; the indoor fan can accelerate the air flow at the indoor heat exchanger and improve the heat exchange effect between the refrigerant flowing through the indoor heat exchanger and the indoor air.
[0020] In order to achieve another purpose of the utility model, the variable frequency air conditioner of the utility model includes an outdoor casing and an indoor casing, wherein the variable frequency air conditioner also includes the above-mentioned air conditioning heat exchange system, the compressor, four-way valve, outdoor heat exchanger, throttling element and variable frequency controller are all arranged in the outdoor casing, and the indoor heat exchanger is arranged in the indoor casing.
[0021] As can be seen from the above, the variable frequency air conditioner equipped with the above-mentioned air conditioning heat exchange system can ensure that the variable frequency controller always maintains a stable and efficient working state, and ensure the reliability and safety of the operation of the variable frequency controller; at the same time, the variable frequency air conditioner has the advantages of simple control, low cost and good working reliability.
[0022] A further solution is that the indoor casing is a hanging casing, a cabinet casing, a duct casing or a ceiling casing.
[0023] As can be seen from the above, this design enables the variable frequency air conditioner to be set as a wall-mounted air conditioner, a cabinet air conditioner, a duct air conditioner or a central air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is a system schematic diagram of the first embodiment of the air-conditioning heat exchange system of the utility model operating in the cooling mode.
[0025] Figure 2 It is a structural diagram of a frequency conversion controller of the first embodiment of the air conditioning heat exchange system of the utility model.
[0026] Figure 3 It is a system schematic diagram of the first embodiment of the air-conditioning heat exchange system of the utility model operating in the heating mode.
[0027] Figure 4 It is a system diagram of the second embodiment of the air conditioning heat exchange system of the utility model.
[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION
[0029] First embodiment of air conditioning heat exchange system
[0030] 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 throttling element 14, an indoor heat exchanger 15, a frequency conversion controller 16, a cooling flow path 17, a first stop valve 181, a second stop valve 182, an outdoor fan 91, and an indoor fan 92. The frequency conversion controller 16 is electrically connected to the compressor 11, the four-way valve 12, the outdoor fan 91, and the indoor fan 92.
[0031] The exhaust port 111 of the compressor 11 is connected to the air inlet 121 of the four-way valve 12, and the return air port 112 of the compressor 11 is connected to the air outlet 122 of the four-way valve 12. The outdoor heat exchanger 13 includes 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 penetrates each first fin to expand the heat exchange area of the outdoor heat exchanger 13, thereby improving the heat exchange effect of the outdoor heat exchanger 13. The first end of the first heat exchange tube is connected to the first transfer port 123 of the four-way valve 12, and the second end of the second heat exchange tube is connected to the cooling flow path 17.
[0032] The indoor heat exchanger 15 includes a plurality of second fins and a second heat exchange tube, the plurality of second fins are distributed along the thickness direction thereof, and the second heat exchange tube is in a winding shape and penetrates each first fin to expand the heat exchange area of the indoor heat exchanger 15, thereby improving the heat exchange effect of the indoor heat exchanger 15. The third end of the second heat exchange tube is connected to the cooling flow path 17, and the fourth end of the second heat exchange tube is connected to the second transfer port 124 of the four-way valve 12.
[0033] The cooling flow path 17 includes a first branch 171, a second branch 172 and a third heat exchange tube 173; wherein the first branch 171 is connected between the second end of the first heat exchange tube of the outdoor heat exchanger 13 and the third end of the second heat exchange tube of the indoor heat exchanger 15, the second branch 172 is connected in parallel with the first branch 171 between the second end of the first heat exchange tube of the outdoor heat exchanger 13 and the third end of the second heat exchange tube of the indoor heat exchanger 15, and the third heat exchange tube 173 is adjacent to the frequency conversion controller 16.
[0034] The first branch 171 includes a first check valve 1711 and a second check valve 1712, wherein a first inlet of the first check valve 1711 is connected to a second end of a first heat exchange tube of the outdoor heat exchanger 13, a first outlet of the first check valve 1711 is connected to a second outlet of the second check valve 1712, and a second inlet of the second check valve 1712 is connected to a third end of a second heat exchange tube of the indoor heat exchanger 15. It can be seen that in the first branch 171, the flow directions of the first check valve 1711 and the second check valve 1712 are opposite.
[0035] The second branch 172 includes a third one-way valve 1721 and a fourth one-way valve 1722, the third outlet of the third one-way valve 1721 is connected to the second end of the first heat exchange tube of the outdoor heat exchanger 13, the third inlet of the third one-way valve 1721 is connected to the fourth inlet of the fourth one-way valve 1722, and the fourth outlet of the fourth one-way valve 1722 is connected to the third end of the second heat exchange tube of the indoor heat exchanger 15. It can be seen that in the second branch 172, the flow directions of the third one-way valve 1721 and the fourth one-way valve 1722 are opposite, and the flow directions of the third one-way valve 1721 and the first one-way valve 1711 are opposite.
[0036] The fifth inlet of the third heat exchange tube 173 is connected to the first branch 171, and the fifth inlet of the third heat exchange tube 173 is connected between the first outlet of the first check valve 1711 and the second outlet of the second check valve 1712, so as to introduce the refrigerant in the first branch 171 into the third heat exchange tube 173. The fifth outlet of the third heat exchange tube 173 is connected to the sixth inlet of the throttling element 14, so as to introduce the refrigerant in the third heat exchange tube 173 to the throttling element 14, and the refrigerant is throttled and cooled by the throttling element 14, so as to ensure the normal operation of the air conditioning heat exchange system 100. The sixth outlet of the throttling element 14 is connected to the second branch 172, and the sixth outlet of the throttling element 14 is connected between the third inlet of the third check valve 1721 and the fourth inlet of the fourth check valve 1722.
[0037] Preferably, as in the present embodiment, the throttling element 14 is a first electronic expansion valve, and the first electronic expansion valve is electrically connected to the frequency conversion controller 16. Using the first electronic expansion valve as the throttling element 14 can improve the temperature control accuracy of the air conditioning heat exchange system 100, and is also conducive to improving the system efficiency and energy efficiency ratio; at the same time, it also enables the air conditioning heat exchange system 100 to be applicable to various working conditions and load changes, and improves the stability and reliability of the air conditioning heat exchange system 100. Of course, as another optional solution, a capillary tube can also be used to replace the first electronic expansion valve. Using the capillary tube as the throttling element 14 is conducive to reducing the cost of the air conditioning heat exchange system 100 and extending the service life of the air conditioning heat exchange system 100; however, using the capillary tube as the throttling element 14 will reduce the temperature control accuracy of the air conditioning heat exchange system 100, and the system efficiency and energy efficiency ratio are poorer than using the first electronic expansion valve as the throttling element 14.
[0038] Furthermore, if Figure 2 As shown, the frequency conversion controller 16 includes a body 161 and a first shell 162, the body 161 and the third heat exchange tube 173 are both installed on the shell, and the body 161 is adjacent to the third heat exchange tube 173, and the third heat exchange tube 173 is installed between the body 161 and the first shell 162, so that the refrigerant in the third heat exchange tube 173 can better exchange heat with the body 161 of the frequency conversion controller 16 to ensure the cooling effect of the frequency conversion controller 16. Preferably, a heat exchange block 163 is provided in the first shell 162, the heat exchange block 163 is adjacent to the body 161, and the third heat exchange tube 173 is installed between the heat exchange block 163 and the body 161; the setting of the heat exchange block 163 can increase the heat exchange area between the frequency conversion controller 16 and the third heat exchange tube 173, improve the heat exchange efficiency, and further improve the cooling effect of the cooling flow path 17 on the frequency conversion controller 16. More preferably, the heat exchange block 163 can be made of metals with high heat exchange efficiency such as aluminum, aluminum alloy or copper to further improve the heat dissipation effect of the frequency conversion controller 16.
[0039] The first stop valve 181 is connected between the indoor heat exchanger 15 and the cooling branch. Specifically, the fifth end of the first stop valve 181 is connected to the second inlet of the second check valve 1712 and the fourth outlet of the fourth check valve 1722, respectively, and the sixth end of the first stop valve 181 is connected to the third end of the second heat exchange tube of the indoor heat exchanger 15; the second stop valve 182 is connected between the fourth end of the second heat exchange tube of the indoor heat exchanger 15 and the second transfer port 124 of the four-way valve 12. By providing the first stop valve 181 and the second stop valve 182, the maintenance of the air conditioning heat exchange system 100 is more convenient, and the flow control of the refrigerant in the air conditioning heat exchange system 100 can be realized, and the refrigerant in the air conditioning heat exchange system 100 can be prevented from incorrectly backflowing.
[0040] The outdoor fan 91 is provided at the outdoor heat exchanger 13, and the outdoor fan 91 is electrically connected to the frequency conversion controller 16; the outdoor fan 91 can accelerate the air flow at the outdoor heat exchanger 13, thereby improving the heat exchange effect between the refrigerant flowing through the outdoor heat exchanger 13 and the outdoor air. The indoor fan 92 is provided at the indoor heat exchanger 15, and the indoor fan 92 is electrically connected to the frequency conversion controller 16; the indoor fan 92 can accelerate the air flow at the indoor heat exchanger 15, thereby improving the heat exchange effect between the refrigerant flowing through the indoor heat exchanger 15 and the indoor air.
[0041] like Figure 1 As shown, when the air conditioning heat exchange system 100 operates in the cooling mode, the frequency conversion controller 16 controls the air inlet 121 of the four-way valve 12 to communicate with the first transfer port 123, and the air outlet 122 to communicate with the second transfer port 124. The exhaust port 111 of the compressor 11 outputs high-pressure and high-temperature gaseous refrigerant to the air inlet 121 of the four-way valve 12, and then is discharged through the first transfer port 123 of the four-way valve 12 and enters the outdoor heat exchanger 13. After the outdoor heat exchanger 13 condenses the high-pressure and high-temperature gaseous refrigerant into high-pressure and medium-temperature liquid refrigerant, it enters the first branch 171 and the second branch 172 of the cooling flow path 17. Among them, since the flow direction of the first one-way valve 1711 in the first branch 171 is the same as the flow direction of the refrigerant in the refrigeration mode, the high-pressure and medium-temperature liquid refrigerant enters the third heat exchange tube 173 after passing through the first one-way valve 1711, so as to exchange heat with the frequency conversion controller 16 through the third heat exchange tube 173, thereby cooling the frequency conversion controller 16; and the flow direction of the second one-way valve 1712 is opposite to the flow direction of the refrigerant in the refrigeration mode, so the refrigerant does not pass through the second one-way valve 1712. Similarly, since the flow direction of the third one-way valve 1721 in the second branch 172 is opposite to the flow direction of the refrigerant in the refrigeration mode, the refrigerant does not pass through the third one-way valve 1721.
[0042] After the refrigerant completes heat exchange with the frequency conversion controller 16 through the third heat exchange tube 173, it enters the throttling element 14, and the throttling element 14 throttles and reduces the pressure of the refrigerant passing through itself, so that the refrigerant becomes a low-pressure and low-temperature liquid refrigerant; then, the low-pressure and low-temperature liquid refrigerant enters the second branch 172. Since the flow direction of the refrigerant in the cooling mode is the same as the flow direction of the fourth one-way valve 1722, the refrigerant enters the indoor heat exchanger 15 through the fourth one-way valve 1722 to be evaporated into a low-pressure and low-temperature gaseous refrigerant, and then enters the second transfer port 124 of the four-way valve 12, and returns to the return port 112 of the compressor 11 through the air outlet 122 of the four-way valve 12. Among them, since the refrigerant pressure after throttling by the throttling element 14 is less than the refrigerant pressure before throttling by the throttling element 14, the low-pressure and low-temperature liquid refrigerant after throttling by the throttling element 14 cannot pass through the third one-way valve 1721 and the second one-way valve 1712.
[0043] like Figure 3 As shown, when the air conditioning heat exchange system 100 operates in the heating mode, the variable frequency air conditioner controls the air inlet 121 of the four-way valve 12 to communicate with the second transfer port 124, and the air outlet 122 to communicate with the first transfer port 123. The exhaust port 111 of the compressor 11 outputs high-pressure and high-temperature gaseous refrigerant to the air inlet 121 of the four-way valve 12, and then is discharged through the second transfer port 124 of the four-way valve 12 and enters the indoor heat exchanger 15. The indoor heat exchanger 15 condenses the high-pressure and high-temperature gaseous refrigerant into a high-pressure and medium-temperature liquid refrigerant, and then enters the first branch 171 and the second branch 172 of the cooling flow path 17. Among them, since the flow direction of the second one-way valve 1712 in the first branch 171 is the same as the flow direction of the refrigerant in the heating mode, the high-pressure and medium-temperature liquid refrigerant enters the third heat exchange tube 173 after passing through the second one-way valve 1712, so as to exchange heat with the frequency conversion controller 16 through the third heat exchange tube 173, thereby cooling the frequency conversion controller 16; and the flow direction of the first one-way valve 1711 is opposite to the flow direction of the refrigerant in the heating mode, so the refrigerant does not pass through the first one-way valve 1711. Similarly, since the flow direction of the fourth one-way valve 1722 in the second branch 172 is opposite to the flow direction of the refrigerant in the heating mode, the refrigerant does not pass through the fourth one-way valve 1722.
[0044] After the refrigerant completes heat exchange with the frequency conversion controller 16 through the third heat exchange tube 173, it enters the throttling element 14, and the throttling element 14 throttles and reduces the pressure of the refrigerant passing through itself, so that the refrigerant becomes a low-pressure and low-temperature liquid refrigerant; then, the low-pressure and low-temperature liquid refrigerant enters the second branch 172, and the flow direction of the refrigerant in the heating mode is the same as the flow direction of the third one-way valve 1721, so the refrigerant enters the outdoor heat exchanger 13 through the third one-way valve 1721 to be evaporated into a low-pressure and low-temperature gaseous refrigerant, and then enters the first transfer port 123 of the four-way valve 12, and returns to the return port 112 of the compressor 11 through the air outlet 122 of the four-way valve 12. Among them, since the refrigerant pressure after throttling by the throttling element 14 is less than the refrigerant pressure before throttling by the throttling element 14, the low-pressure and low-temperature liquid refrigerant after throttling by the throttling element 14 cannot pass through the fourth one-way valve 1722 and the first one-way valve 1711.
[0045] In summary, it can be seen that through the design of the air conditioning heat exchange system 100 and its cooling flow path 17, no matter whether the air conditioning heat exchange system 100 is in cooling mode or heating mode, the cooling flow path 17 can cool down the frequency conversion controller 16 through the high-pressure medium-temperature refrigerant, so that the air conditioning heat exchange system 100 can still maintain strong cooling without tripping at a high outdoor ambient temperature, thereby greatly improving the high-temperature heating capacity of the air conditioning heat exchange system 100; in addition, because the temperature of the high-pressure medium-temperature refrigerant is higher than the ambient dew point temperature, and there is a need to cool the frequency conversion controller 16 In order to meet the need for cooling, the cooling flow path 17 can prevent condensation from occurring in the frequency conversion controller 16 when cooling the frequency conversion controller 16, thereby ensuring the reliability and safety of the operation of the frequency conversion controller 16; furthermore, the cooling flow path 17 only controls the flow direction of the refrigerant through four one-way valves, so each one-way valve of the cooling flow path 17 can automatically control the flow direction of the refrigerant according to the high and low pressure difference of the system refrigerant, thereby eliminating the need for additional control levels, simplifying the control method of the air-conditioning heat exchange system 100, and improving the reliability of the operation of the air-conditioning heat exchange system 100.
[0046] Second embodiment of air conditioning heat exchange system
[0047] Reference Figure 4 The difference between this embodiment and the first embodiment of the air conditioning heat exchange system is that, in this embodiment:
[0048] The air conditioning heat exchange system also includes an air replenishment and enthalpy increase unit 2, which includes an economizer 21 and a second electronic expansion valve 22. The economizer 21 includes a second shell 211 and a fourth heat exchange tube 212. The second shell 211 has a heat exchange cavity 2111 and a seventh inlet 21111 and a seventh outlet 21112 connected to the heat exchange cavity 2111. The seventh outlet 21112 is connected to the air replenishment port 31 of the compressor 3. The fourth heat exchange tube 212 is arranged in the heat exchange cavity 2111. The eighth inlet 212 of the fourth heat exchange tube 212 is connected to the air replenishment port 31 of the compressor 3. 1 is connected between the first outlet of the first one-way valve 41 and the second outlet of the second one-way valve 42, the eighth outlet 2122 of the fourth heat exchange pipe 212 is connected to the fifth inlet 431 of the third heat exchange pipe 43, the second electronic expansion valve 22 is electrically connected to the frequency conversion controller 5, the ninth inlet and the eighth inlet of the second electronic expansion valve 22 are connected by a three-way pipe and are simultaneously connected between the first outlet of the first one-way valve 41 and the second outlet of the second one-way valve 42, and the ninth outlet of the second electronic expansion valve 22 is connected to the seventh inlet 2111. It can be seen that the provision of the air-injection enthalpy-increasing unit 2 can better reduce the temperature of the refrigerant flowing into the third heat exchange pipe, enhance the effect of reducing the temperature of the frequency conversion controller; and at the same time can improve the heating capacity of the air-conditioning heat exchange system, and enable the air-conditioning heat exchange system to adapt to a lower outdoor ambient temperature.
[0049] Inverter air conditioner embodiment
[0050] The variable frequency air conditioner comprises an outdoor casing, an indoor casing and an air conditioning heat exchange system, wherein the air conditioning heat exchange system is the air conditioning heat exchange system described in the first embodiment or the second embodiment of the air conditioning heat exchange system. The compressor, the four-way valve, the outdoor heat exchanger, the throttling element and the variable frequency controller are all arranged in the outdoor casing, and the outdoor fan is installed on the outdoor casing; the indoor heat exchanger is arranged in the indoor casing, and the indoor fan is arranged in the indoor casing. Preferably, the indoor casing is a hanging casing, a cabinet casing, a duct casing or a ceiling casing, so that the variable frequency air conditioner can be set as a wall-mounted air conditioner, a cabinet air conditioner, a duct machine or a central air conditioner.
[0051] It can be seen that the variable frequency air conditioner can ensure that the variable frequency controller always maintains a stable and efficient working state and ensures the reliability and safety of the variable frequency controller operation by setting the above-mentioned air conditioning heat exchange system; at the same time, the variable frequency air conditioner has the advantages of simple control, low cost and good working reliability.
[0052] 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 air inlet of the four-way valve is connected to the air outlet of the compressor, and the air outlet of the four-way valve is connected to the air return port of the compressor; 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; Throttling element; An indoor heat exchanger, wherein the fourth end of the second heat exchange tube of the indoor heat exchanger is connected to the second transfer port of the four-way valve; A frequency conversion controller, the frequency conversion controller is electrically connected to the compressor and the four-way valve respectively; Characteristically, the air conditioning heat exchange system further comprises a cooling flow path, and the cooling flow path comprises: A first branch, the first branch comprising a first one-way valve and a second one-way valve, a first inlet of the first one-way valve being connected to the second end of the first heat exchange tube, a first outlet of the first one-way valve being connected to the second outlet of the second one-way valve, and a second inlet of the second one-way valve being connected to the third end of the second heat exchange tube; a second branch, wherein the second branch comprises a third one-way valve and a fourth one-way valve, wherein a third outlet of the third one-way valve is connected to the second end of the first heat exchange tube, a third inlet of the third one-way valve is connected to the fourth inlet of the fourth one-way valve, and a fourth outlet of the fourth one-way valve is connected to the third end of the second heat exchange tube; The third heat exchange tube is connected to the frequency conversion controller, the fifth inlet of the third heat exchange tube is connected between the outlets of the first one-way valve and the second one-way valve, the fifth outlet of the third heat exchange tube is connected to the sixth inlet of the throttling element, and the sixth outlet of the throttling element is connected between the inlets of the third one-way valve and the fourth one-way valve.
2. The air conditioning heat exchange system according to claim 1, characterized in that: The throttling element is a first electronic expansion valve, and the first electronic expansion valve is electrically connected to the frequency conversion controller; or The throttling element is a capillary tube.
3. The air conditioning heat exchange system according to claim 2, characterized in that: The frequency conversion controller comprises: ontology; The first shell is provided, the main body and the third heat exchange tube are both mounted on the shell, and the main body is adjacent to the third heat exchange tube.
4. The air conditioning heat exchange system according to claim 3, characterized in that: A heat exchange block is disposed in the first shell, the heat exchange block is adjacent to the main body, and the third heat exchange tube is installed on the heat exchange block.
5. The air conditioning heat exchange system according to claim 4, characterized in that: The heat exchange block is made of aluminum, aluminum alloy or copper.
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: An economizer, the economizer comprising a second shell and a fourth heat exchange tube, the second shell having a heat exchange cavity and a seventh inlet and a seventh outlet communicated with the heat exchange cavity, the seventh outlet being connected to the air supply port of the compressor, the fourth heat exchange tube being arranged in the heat exchange cavity, the eighth inlet of the fourth heat exchange tube being communicated between the first outlet and the second outlet, and the eighth outlet of the fourth heat exchange tube being connected to the fifth inlet; A second electronic expansion valve, the second electronic expansion valve is electrically connected to the frequency conversion controller, a ninth inlet of the second electronic expansion valve is connected between the first outlet and the second outlet, and a ninth outlet of the second electronic expansion valve is connected to the seventh inlet.
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, wherein a fifth end of the first stop valve is connected to the second inlet and the fourth outlet respectively, and a sixth end of the first stop valve is connected to the third end of the second heat exchange tube; A second stop valve is connected to the fourth end of the second heat exchange tube and the second transfer port.
8. The air conditioning heat exchange system according to claim 7, characterized in that: The air conditioning heat exchange system also includes: An outdoor fan, the outdoor fan is electrically connected to the frequency conversion controller, and the outdoor fan is arranged at the outdoor heat exchanger; An indoor fan is electrically connected to the frequency conversion controller and is disposed at the indoor heat exchanger.
9. A variable frequency air conditioner, comprising an outdoor casing and an indoor casing, characterized in that: The variable frequency air conditioner also includes an air conditioning heat exchange system as described in any one of claims 1 to 8, wherein the compressor, the four-way valve, the outdoor heat exchanger, the throttling element and the variable frequency controller are all arranged in the outdoor casing, and the indoor heat exchanger is arranged in the indoor casing.
10. The variable frequency air conditioner according to claim 9, characterized in that: The indoor casing is a hanging casing, a cabinet casing, a duct casing or a ceiling casing.