Air conditioner

Abstract

The utility model provides an air conditioner, relates to the technical field of air conditioners, and aims to solve the problem that heating needs to be interrupted during defrosting. The air conditioner comprises an indoor heat exchanger and an outdoor heat exchanger, the outdoor heat exchanger is provided with a first local part and a second local part which are arranged in parallel, and the first sides of the first local part and the second local part are connected with a first electronic expansion valve which communicates with the indoor heat exchanger. A second electronic expansion valve is arranged between the first side of the second part of the outdoor heat exchanger and the first electronic expansion valve, and the first part and the second part of the outdoor heat exchanger are arranged in parallel. Heating can be continued during defrosting.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, and in particular to an air conditioner. Background Art

[0002] As a device that can transfer heat from a low-quality heat source to a high-quality heat source, heat pumps are widely used and promoted in the air-conditioning industry.

[0003] During the winter heating period, air source heat pump units are usually used to provide indoor heating. However, in the prior art, due to the low outdoor temperature in winter, the temperature of the refrigerant pipe of the outdoor unit is lower than the air dew point temperature, and a large amount of frost appears in the outdoor unit, which reduces the heat transfer performance of the outdoor unit, affects the air flow, and increases the energy consumption of the fan. Therefore, the heat pump must be defrosted in time.

[0004] However, the traditional defrosting method of switching between heating and cooling modes requires stopping the indoor heating during defrosting, which wastes time and affects the user's heating experience. Utility Model Content

[0005] The first object of the utility model is to provide an air conditioner to solve the technical problem that heating needs to be interrupted during defrosting.

[0006] The utility model provides

[0007] An air conditioner includes an indoor heat exchanger and an outdoor heat exchanger, wherein the outdoor heat exchanger has a first part and a second part arranged in parallel, a first electronic expansion valve is connected to the first side of the first part and the second part, the first electronic expansion valve is connected to the indoor heat exchanger, a second electronic expansion valve is provided between the first side of the second part of the outdoor heat exchanger and the first electronic expansion valve, and the first part and the second part of the outdoor heat exchanger are arranged in parallel.

[0008] The beneficial effects brought by the utility model air conditioner are:

[0009] By setting a first electronic expansion valve on the first side of the outdoor heat exchanger, that is, the side facing the indoor heat exchanger, the opening of the first electronic expansion valve can be controlled when the air conditioner is in heating fuzzy state to control the refrigerant flow in the cooling circuit. When it is necessary to defrost the first part of the outdoor heat exchanger, the first electronic expansion valve can be controlled to be fully opened, and the second electronic expansion valve can be used to control the refrigerant flow entering the second part of the outdoor heat exchanger, so that part of the refrigerant can directly enter the first part to defrost the first part. In this way, the air conditioner will not be interrupted from absorbing outdoor heat from the outdoor heat exchanger during the defrosting process to meet the continuous heating demand for the indoor room, and the user's heating experience will not be significantly affected.

[0010] In a preferred technical solution, a one-way valve is provided between the first side of the first part and the first electronic expansion valve.

[0011] A one-way valve is arranged between the first side of the first part of the outdoor heat exchanger and the first electronic expansion valve to prevent the liquid refrigerant formed after the refrigerant enters the outdoor heat exchanger and cools and releases heat to flow back.

[0012] In a preferred technical solution, a solenoid valve is provided between the first side of the first part and the first electronic expansion valve, and the solenoid valve is provided in parallel with the one-way valve.

[0013] A solenoid valve is set at the above position and is set in parallel with the one-way valve. When the air conditioner is in cooling state, the solenoid valve can be opened, so that the refrigerant can flow out of the first part of the outdoor heat exchanger from the first side and enter the circulation, thereby expanding the size of the area that can be used by the outdoor heat exchanger during cooling, thereby improving the cooling capacity of the air conditioner.

[0014] In a preferred technical solution, the air conditioner includes a four-way reversing valve, a compressor and a gas-liquid separator, the four-way reversing valve can be switched between a first state and a second state, the four-way reversing valve has a first port, a second port, a third port and a fourth port, in the first state, the first port and the second port are connected and the third port and the fourth port are connected, in the second state, the first port and the fourth port are connected and the second port and the third port are connected;

[0015] The first port is connected to the discharge port of the compressor, the second port is connected to the indoor heat exchanger, and the third port is connected to the suction port of the compressor through the gas-liquid separator;

[0016] The second side of the first part of the outdoor heat exchanger is connected to the fourth port through the third electronic expansion valve, and the second side of the second part of the outdoor heat exchanger is connected to the fourth port.

[0017] By arranging a third electronic expansion valve on the second side of the first part and connecting it to the four-way reversing valve, in the continuous heating mode, the refrigerant can pass through the first part first, and the heat in the refrigerant can be used to release heat and defrost the first part. There is no need to stop the refrigerant from absorbing heat through the second part of the outdoor heat exchanger to continue to maintain the heating function of the air conditioner, thereby realizing continuous heating of the air conditioner and improving the user experience of the air conditioner outdoor unit during defrosting.

[0018] In a preferred technical solution, the air conditioner includes a controller, which is electrically connected to a first temperature sensor, the first temperature sensor is used to detect the indoor ambient temperature, the controller is electrically connected to the first electronic expansion valve, the second electronic expansion valve and the third electronic expansion valve, and the controller is used to control the opening of the first electronic expansion valve, the second electronic expansion valve and the third electronic expansion valve when the temperature detected by the first temperature sensor reaches a preset temperature.

[0019] In cooling mode or heating mode, when the indoor ambient temperature reaches the preset indoor temperature or the indoor temperature range threshold, after the first temperature sensor detects the relevant temperature, the controller can control the opening of the first electronic expansion valve, the second electronic expansion valve and the third electronic expansion valve to achieve control of the refrigerant flow and state in the air conditioner.

[0020] In a preferred technical solution, the air conditioner further includes a second temperature sensor electrically connected to the controller, the second temperature sensor is arranged in the first part, the second temperature sensor is used to detect the temperature of the first part, and the controller is used to open and close the solenoid valve.

[0021] By setting a second temperature sensor to detect the temperature of the first part of the outdoor heat exchanger, when the ambient temperature is deemed to have reached the preset temperature and the pipe temperature of the first part of the outdoor heat exchanger has reached the set defrost temperature, the controller sends a control instruction to the first electronic expansion valve, the second electronic expansion valve and the third electronic expansion valve, and the solenoid valve, so that the third electronic expansion valve and the second electronic expansion valve control throttling, the first electronic expansion valve is fully opened, and the solenoid valve is closed, so that the first part and the second part of the outdoor heat exchanger work simultaneously, realizing continuous heating and defrosting mode operation.

[0022] In a preferred technical solution, a high-pressure protection switch is provided on the connecting pipeline between the discharge port of the compressor and the first port.

[0023] By setting a high-pressure protection switch here, it is possible to prevent the high-pressure gaseous refrigerant discharged from the compressor from having an excessive pressure and affecting the four-way reversing valve. That is, when the pressure of the refrigerant discharged from the discharge port of the compressor is too high, the high-pressure protection switch is disconnected to prevent the high-pressure gaseous refrigerant with excessive pressure from entering the four-way reversing valve and causing damage to the four-way reversing valve, thereby improving the safety and reliability of the four-way reversing valve.

[0024] In a preferred technical solution, the controller is used to control the four-way reversing valve to be in a first state in the heating mode, and to control the second electronic expansion valve and the third electronic expansion valve to be fully open and to control the first electronic expansion valve to be in a throttling state.

[0025] By controlling the throttling of the first electronic expansion valve, the overall flow in the refrigerant circulation loop can be controlled, while by controlling the second and third electronic expansion valves to be fully open, the first and second parts of the outdoor heat exchanger can be kept fully open to absorb heat from the outdoors, providing a heat source for the heating of the air conditioner.

[0026] In the preferred technical solution, the controller is used to control the four-way reversing valve to be in the second state in the refrigeration mode, and to control the second electronic expansion valve and the third electronic expansion valve to be fully open, and to control the first electronic expansion valve to be in the throttling state and to control the solenoid valve to be in the on state.

[0027] By controlling the throttling of the first electronic expansion valve, the overall flow rate in the refrigerant circulation loop can be controlled, and by controlling the second and third electronic expansion valves to be fully opened, the first and second parts of the outdoor heat exchanger can be kept fully open to release heat to the outdoors, thereby reducing the temperature of the refrigerant to provide a cooler refrigerant for the indoor heat exchanger. Moreover, by controlling the solenoid valve to be in the conducting state, the first part can also participate in the circulation loop and will not be affected by the one-way conduction and reverse interception performance of the one-way valve, thereby improving the refrigerant heat release capacity of the outdoor heat exchanger.

[0028] In a preferred technical solution, the controller is used to control the four-way reversing valve to be in a first state in a continuous heating mode, and to control the second electronic expansion valve and the third electronic expansion valve to be in a throttling state and to control the first electronic expansion valve to be fully open.

[0029] By controlling the first electronic expansion valve to be fully open, the restriction of the first electronic expansion valve on the refrigerant in the circulation loop is reduced as much as possible, so that more refrigerant can enter the outdoor heat exchanger. By throttling the second electronic expansion valve, the refrigerant entering the second part can be controlled, so that other refrigerant can enter the first part to release heat and defrost the first part. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments or background technologies of the present invention, the drawings required for use in the embodiments or background technology descriptions are briefly introduced below. Obviously, the drawings described below are merely embodiments of the present invention, and ordinary technicians in this field can obtain other drawings based on the provided drawings without paying any creative work.

[0031] Figure 1 A schematic diagram of the structure of an air conditioner provided in Embodiment 1 of the utility model;

[0032] Figure 2 A schematic diagram of the refrigerant flow of the air conditioner in the cooling mode of the air conditioner provided in the first embodiment of the utility model;

[0033] Figure 3 This is a structural schematic diagram of the air conditioner provided in the first embodiment of the present utility model in the air conditioner heating mode and the continuous heating mode.

[0034] Description of reference numerals:

[0035] 11-Indoor heat exchanger;

[0036] 21-third electronic expansion valve; 22-outdoor heat exchanger; 221-first part; 222-second part; 23-first electronic expansion valve; 24-second electronic expansion valve; 25-solenoid valve; 26-check valve; 27-four-way reversing valve; 28-compressor; 29-gas-liquid separator. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0038] Embodiment 1:

[0039] Figure 1 This is a schematic diagram of the structure of the air conditioner provided in the first embodiment of the utility model. Figure 1-Figure 3 As shown, the air conditioner provided in Embodiment 1 of the utility model includes an indoor heat exchanger 11 and an outdoor heat exchanger 22. The outdoor heat exchanger 22 has a first part 221 and a second part 222 arranged in parallel. The first sides of the first part 221 and the second part 222 are connected to a first electronic expansion valve 23. The first electronic expansion valve 23 is connected to the indoor heat exchanger 11. A second electronic expansion valve 24 is provided between the first side of the second part 222 of the outdoor heat exchanger 22 and the first electronic expansion valve 23. The first part 221 and the second part 222 of the outdoor heat exchanger 22 are arranged in parallel.

[0040] In this embodiment, the outdoor heat exchanger 22 includes a first part 221 and a second part 222. The first part 221 and the second part 222 each include some outdoor coils. The first part 221 and the second part 222 also each have their own external flow ports, but the first part 221 and the second part 222 are not connected in the outdoor heat exchanger 22. That is, after the refrigerant flows into the first part 221 or the second part 222, before leaving the outdoor heat exchanger 22, it will not flow through the other second part 222 and the first part 221. The first side of the second part 222 and the first part 221 is the left side of the two in the figure, and the second side of the second part 222 and the first part 221 described later is the right side of the two in the figure.

[0041] Frost of the outdoor heat exchanger 22 during the heating process mainly occurs on the first part 221, so defrosting the first part 221 also achieves defrosting of the outdoor heat exchanger 22. The first part 221 can be part of the outdoor coil at the bottom of the outdoor heat exchanger 22. The outdoor coil at the bottom of the outdoor heat exchanger 22 is more prone to frost and ice than the outdoor coils in other areas.

[0042] It should be noted that, in this embodiment, component A is connected to component B, which does not mean that only component B is connected to the position, or component B is directly connected without setting other non-pipeline parts. For example, the first side of the outdoor heat exchanger 22 is connected to the first electronic expansion valve 23. In fact, many other components can be set between the first electronic expansion valve 23 and the first side of the outdoor heat exchanger 22, such as a one-way valve 26 and a second electronic expansion valve 24, and a solenoid valve 25 described later.

[0043] In addition, those skilled in the art can understand that the outdoor heat exchanger 22 in this embodiment is located in the outdoor unit of the air conditioner, and the outdoor heat exchanger 22 can be a finned tube heat exchanger, which serves as an evaporator in the heating cycle to provide heat for the gasification of the liquid refrigerant. The indoor heat exchanger 11 is located in the indoor unit. In the heating cycle, the indoor heat exchanger 11 transfers the heat released when the gaseous refrigerant condenses to the room through gas exchange, so that the indoor temperature increases, thereby achieving the purpose of heating the room.

[0044] By setting the first electronic expansion valve 23 on the first side of the outdoor heat exchanger 22, i.e., the side facing the indoor heat exchanger 11, the opening of the first electronic expansion valve 23 can be controlled when the air conditioner is in heating fuzzy state to control the refrigerant flow in the cooling circuit. When it is necessary to defrost the first part 221 of the outdoor heat exchanger 22, the first electronic expansion valve 23 can be controlled to be fully opened, and the second electronic expansion valve 24 can be used to control the refrigerant flow entering the second part 222 of the outdoor heat exchanger 22, so that part of the refrigerant can directly enter the first part 221 to defrost the first part 221. Thereby, the air conditioner will not be interrupted from absorbing outdoor heat from the outdoor heat exchanger 22 during the defrosting process to meet the continuous heating demand for the indoor room, and the user's heating experience will not be significantly affected.

[0045] Moreover, the air conditioner of this embodiment can realize defrosting without other external structures, and is relatively easy to implement. This solution makes little change to the overall air conditioner, adds few new parts, has a simple system structure, has little cost increase, and is small and easy to install. In addition, the improved air conditioner can realize both defrosting and defrosting functions in view of the fact that the bottom of the air conditioner outdoor unit is prone to frost and ice in winter.

[0046] like Figure 1As shown, preferably, a one-way valve 26 is provided between the first side of the first part 221 of the outdoor heat exchanger 22 and the first electronic expansion valve 23 .

[0047] A one-way valve 26 is provided between the first side of the first part 221 of the outdoor heat exchanger 22 and the first electronic expansion valve 23 to prevent the liquid refrigerant formed after the refrigerant enters the outdoor heat exchanger 22 and cools and releases heat to flow back.

[0048] like Figure 1 As shown, preferably, a solenoid valve 25 is provided between the first side of the first part 221 of the outdoor heat exchanger 22 and the first electronic expansion valve 23 , and the solenoid valve 25 is provided in parallel with the one-way valve 26 .

[0049] A solenoid valve 25 is set at the above position and is set in parallel with the one-way valve 26. When the air conditioner is in a cooling state, the solenoid valve 25 can be opened, so that the first part 221 of the outdoor heat exchanger 22 can flow out the refrigerant from the first side into the circulation, thereby expanding the size of the area that can be used for the outdoor heat exchanger 22 during cooling, thereby improving the cooling capacity of the air conditioner.

[0050] like Figure 1 As shown, preferably, it includes a four-way reversing valve 27, a compressor 28 and a gas-liquid separator 29, the four-way reversing valve 27 can be switched between a first state and a second state, the four-way reversing valve 27 has a first port, a second port, a third port and a fourth port, in the first state, the first port and the second port are connected and the third port and the fourth port are connected, in the second state, the first port and the fourth port are connected and the second port and the third port are connected;

[0051] The first port of the four-way reversing valve 27 is connected to the discharge port of the compressor 28, the second port of the four-way reversing valve 27 is connected to the indoor heat exchanger 11, and the third port of the four-way reversing valve 27 is connected to the suction port of the compressor 28 through the gas-liquid separator 29;

[0052] The second side of the first part 221 of the outdoor heat exchanger 22 is connected to the fourth port through the third electronic expansion valve 21 , and the second side of the second part 222 of the outdoor heat exchanger 22 is connected to the fourth port.

[0053] The compressor 28 is used as a power driving element to convert low-pressure gaseous refrigerant into high-pressure gaseous refrigerant. The gas-liquid separator 29 is used at the outlet of the evaporator during the circulation process to prevent the liquid refrigerant from entering the compressor 28 and affecting the normal operation of the compressor 28.

[0054] By arranging a third electronic expansion valve 21 on the second side of the first part 221 and connecting it to the four-way reversing valve 27, in the continuous heating mode, the refrigerant can first pass through the first part 221, and the heat in the refrigerant can be used to release heat and defrost the first part 221. There is no need to stop the refrigerant from absorbing heat through the second part 222 of the outdoor heat exchanger 22 to continue to maintain the heating function of the air conditioner, thereby realizing continuous heating of the air conditioner and improving the user experience of the air conditioner outdoor unit during defrosting.

[0055] Preferably, the air conditioner includes a controller (not shown in the figure), the controller is electrically connected to a first temperature sensor (not shown in the figure), the first temperature sensor is used to detect the indoor ambient temperature, the controller is electrically connected to the first electronic expansion valve 23, the second electronic expansion valve 24 and the third electronic expansion valve 21, and the controller is used to control the opening of the first electronic expansion valve 23, the second electronic expansion valve 24 and the third electronic expansion valve 21 when the temperature detected by the first temperature sensor reaches a preset temperature.

[0056] In cooling mode or heating mode, when the indoor ambient temperature reaches the preset indoor temperature or the indoor temperature range threshold, after the first temperature sensor detects the relevant temperature, the controller can control the opening of the first electronic expansion valve 23, the second electronic expansion valve 24 and the third electronic expansion valve 21 to achieve control of the refrigerant flow and state in the air conditioner.

[0057] Preferably, the air conditioner also includes a second temperature sensor (not shown in the figure) electrically connected to the controller. The second temperature sensor is arranged in the first part 221. The second temperature sensor is used to detect the temperature of the first part 221. The controller is used to open and close the solenoid valve 25.

[0058] By setting a second temperature sensor to detect the temperature of the first part 221 of the outdoor heat exchanger 22, when the ambient temperature is considered to have reached the preset temperature and the pipe temperature of the first part 221 of the outdoor heat exchanger 22 has reached the set defrost temperature, the controller sends a control instruction to the first electronic expansion valve 23, the second electronic expansion valve 24 and the third electronic expansion valve 21, and the solenoid valve 25, so that the third electronic expansion valve 21 and the second electronic expansion valve 24 control the throttling, the first electronic expansion valve 23 is fully opened, and the solenoid valve 25 is closed, so that the first part 221 and the second part 222 of the outdoor heat exchanger 22 work simultaneously, realizing continuous heating and defrosting mode operation.

[0059] Preferably, a high-pressure protection switch (not shown in the figure) is provided on the connecting pipeline between the discharge port of the compressor 28 and the first port.

[0060] By setting a high-pressure protection switch here, it is possible to prevent the high-pressure gaseous refrigerant discharged from the compressor 28 from having an excessive pressure and affecting the four-way reversing valve 27. That is, when the pressure of the refrigerant discharged from the discharge port of the compressor 28 is too high, the high-pressure protection switch is disconnected to prevent the high-pressure gaseous refrigerant with excessive pressure from entering the four-way reversing valve 27 and causing damage to the four-way reversing valve 27, thereby improving the safety and reliability of the four-way reversing valve 27.

[0061] like Figure 2 As shown, preferably, the controller is used to control the four-way reversing valve 27 to be in the second state in the cooling mode, and to control the second electronic expansion valve 24 and the third electronic expansion valve 21 to be fully open, and to control the first electronic expansion valve 23 to be in the throttling state and to control the solenoid valve 25 to be in the conducting state.

[0062] By controlling the throttling of the first electronic expansion valve 23, the overall flow rate in the refrigerant circulation loop can be controlled, and by controlling the second electronic expansion valve 24 and the third electronic expansion valve 21 to be fully opened, the first part 221 and the second part 222 of the outdoor heat exchanger 22 can be kept fully opened to release heat to the outdoors, thereby reducing the temperature of the refrigerant to provide a cooler refrigerant to the indoor heat exchanger 11. Moreover, by controlling the solenoid valve 25 to be in the conducting state, the first part 221 can also participate in the circulation loop and will not be affected by the one-way conduction and reverse interception performance of the one-way valve 26, thereby improving the refrigerant heat release capacity of the outdoor heat exchanger 22.

[0063] like Figure 3 As shown, preferably, the controller is used to control the four-way reversing valve 27 to be in the first state in the heating mode, and to control the second electronic expansion valve 24 and the third electronic expansion valve 21 to be fully open and to control the first electronic expansion valve 23 to be in the throttling state.

[0064] By controlling the throttling of the first electronic expansion valve 23, the overall flow in the refrigerant circulation loop can be controlled, while by controlling the second electronic expansion valve 24 and the third electronic expansion valve 21 to be fully open, the first part 221 and the second part 222 of the outdoor heat exchanger 22 can be kept fully open to absorb heat from the outdoors, thereby providing a heat source for the heating of the air conditioner.

[0065] like Figure 3 As shown, preferably, the controller is used to control the four-way reversing valve 27 to be in the first state in the continuous heating mode, and to control the second electronic expansion valve 24 and the third electronic expansion valve 21 to be in the throttling state and to control the first electronic expansion valve 23 to be fully open.

[0066] In this embodiment, in the continuous heating mode, the solenoid valve 25 is in a closed state, and the refrigerant can enter the first part 221 through the one-way valve 26. In another implementation, in the continuous heating mode, the solenoid valve 25 can also be in an open state, and the refrigerant can also enter the first part 221 through the solenoid valve 25.

[0067] By controlling the first electronic expansion valve 23 to be fully open, the restriction of the first electronic expansion valve 23 on the refrigerant in the circulation loop is reduced as much as possible, so that more refrigerant can enter the outdoor heat exchanger 22. By throttling the second electronic expansion valve 24, the refrigerant entering the second part 222 can be controlled, so that other refrigerant can enter the first part 221 to release heat and defrost the first part 221.

[0068] The operating principle of this embodiment is:

[0069] In this embodiment, the air conditioner may have three modes: cooling mode, heating mode and continuous heating mode.

[0070] like Figure 2 As shown, when the cooling mode is running, the four-way reversing valve 27 is in the second state, that is, the first port and the fourth port are connected, and the second port and the third port are connected, then the discharge port of the compressor 28 can be connected to the outdoor heat exchanger 22 through the four-way reversing valve 27, and the outlet of the indoor heat exchanger 11 is connected to the gas-liquid separator 29 through the four-way reversing valve 27. The solenoid valve 25 is opened, the first electronic expansion valve 23 is in the throttling state, and the second electronic expansion valve 24 and the third electronic expansion valve 21 are fully opened. After the high-pressure gaseous refrigerant compressed by the compressor 28 passes through the four-way reversing valve 27, it is divided into two paths, one path directly enters the second part 222 of the outdoor heat exchanger 22, and the other path enters the first part 221 of the outdoor heat exchanger 22 through the third electronic expansion valve 21. The first part 221 and the second part 222 of the outdoor heat exchanger 22 can both release heat to the outside to cool the refrigerant. The refrigerant passing through the first part 221 of the outdoor heat exchanger 22 flows to the first electronic expansion valve 23 through the solenoid valve 25, and the refrigerant passing through the second part 222 of the outdoor heat exchanger 22 flows to the first electronic expansion valve 23 through the second electronic expansion valve 24, and reaches the indoor heat exchanger 11 after being throttled by the third electronic expansion valve 21. The refrigerant gasifies and absorbs heat in the indoor heat exchanger 11, and passes through the four-way reversing valve 27 and the gas-liquid separator 29 in sequence. The gas-liquid separator 29 separates the gas and liquid of the refrigerant that is not completely gasified, and finally enters the suction port of the compressor 28, and performs the next round of refrigeration cycle, thereby achieving the purpose of indoor refrigeration.

[0071] like Figure 3As shown, when the heating mode is running, the four-way reversing valve 27 is in the first state, that is, the first port and the second port are connected, and the fourth port and the third port are connected, then the discharge port of the compressor 28 can be connected to the indoor heat exchanger 11 through the four-way reversing valve 27, and the second side of the outdoor heat exchanger 22 is connected to the gas-liquid separator 29 through the four-way reversing valve 27. The solenoid valve 25 is closed, the second electronic expansion valve 24 and the third electronic expansion valve 21 are fully opened, and the first electronic expansion valve 23 is in a throttling state. After being compressed by the compressor 28, the high-pressure gaseous refrigerant passes through the four-way reversing valve 27, enters the indoor heat exchanger 11 to condense and release heat, heats the indoor air, and then is throttled by the first electronic expansion valve 23 and is divided into two paths. One path passes through the second electronic expansion valve 24 to enter the second part 222 of the outdoor heat exchanger 22, and the other path passes through the one-way valve 26 to enter the first part 221 of the outdoor heat exchanger 22. The two refrigerants are gasified and absorb heat in the outdoor heat exchanger 22. The refrigerant passing through the second part 222 flows directly to the four-way reversing valve 27 after flowing out of the outdoor heat exchanger 22, and the refrigerant passing through the first part 221 flows through the third electronic expansion valve 21 to the four-way reversing valve 27 after flowing out of the outdoor heat exchanger 22. The refrigerant passes through the four-way reversing valve 27 and the gas-liquid separator 29 in turn. The gas-liquid separator 29 separates the gas and liquid of the refrigerant that is not completely gasified, and finally enters the suction port of the compressor 28 and performs the next round of heating cycle, thereby achieving the purpose of indoor heating.

[0072] like Figure 3 As shown, when the heating mode is in operation, the four-way reversing valve 27 is in the first state, that is, the first port and the second port are connected, and the fourth port and the third port are connected, then the discharge port of the compressor 28 can be connected to the indoor heat exchanger 11 through the four-way reversing valve 27, and the second side of the outdoor heat exchanger 22 is connected to the gas-liquid separator 29 through the four-way reversing valve 27. The solenoid valve 25 is closed, the second electronic expansion valve 24 and the third electronic expansion valve 21 are in the throttling state, and the first electronic expansion valve 23 is fully open. The high-pressure gaseous refrigerant compressed by the compressor 28 enters the indoor heat exchanger 11 after passing through the four-way reversing valve 27, condenses and releases heat, and heats the indoor air. After passing through the first electronic expansion valve 23, the refrigerant is divided into two paths. One path passes through the second electronic expansion valve 24 and enters the second part 222 of the outdoor heat exchanger 22 to be vaporized and absorb heat. After flowing out of the outdoor heat exchanger 22, it directly flows to the four-way reversing valve 27. The other path passes through the one-way valve 26 and enters the first part 221 of the outdoor heat exchanger 22. After cooling and releasing heat in the first part 221, the first part 221 is defrosted and then throttled by the third electronic expansion valve 21 and flows to the four-way reversing valve 27. The refrigerant passes through the four-way reversing valve 27 and the gas-liquid separator 29 in sequence. The gas-liquid separator 29 separates the gas and liquid of the refrigerant that is not completely vaporized, and finally enters the suction port of the compressor 28 and performs the next round of heating cycle, thereby achieving the purpose of indoor heating.

[0073] Although the utility model is disclosed as above, the utility model is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the scope defined by the claims.

[0074] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprises a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0075] In the above embodiments, the descriptions of directions such as “upper” and “lower” are all based on the drawings.

[0076] The above description of the disclosed embodiments enables professionals in the field to implement or use the utility model. Various modifications to these embodiments will be apparent to professionals in the field, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model.

[0077] Therefore, the present invention will not be limited to the embodiments shown herein but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An air conditioner, characterized in that: The invention comprises an indoor heat exchanger (11) and an outdoor heat exchanger (22), wherein the outdoor heat exchanger (22) comprises a first part (221) and a second part (222) arranged in parallel, wherein the first side of the first part (221) and the second part (222) are connected to a first electronic expansion valve (23), the first electronic expansion valve (23) is connected to the indoor heat exchanger (11), and a second electronic expansion valve (24) is provided between the first side of the second part (222) of the outdoor heat exchanger (22) and the first electronic expansion valve (23).

2. The air conditioner according to claim 1, characterized in that: A one-way valve (26) is provided between the first side of the first part (221) and the first electronic expansion valve (23).

3. The air conditioner according to claim 2, characterized in that: A solenoid valve (25) is provided between the first side of the first part (221) and the first electronic expansion valve (23), and the solenoid valve (25) is arranged in parallel with the one-way valve (26).

4. The air conditioner according to claim 3, characterized in that: The air conditioner comprises a four-way reversing valve (27), a compressor (28) and a gas-liquid separator (29); the four-way reversing valve (27) is switchable between a first state and a second state; the four-way reversing valve (27) has a first port, a second port, a third port and a fourth port; in the first state, the first port and the second port are connected and the third port and the fourth port are connected; in the second state, the first port and the fourth port are connected and the second port and the third port are connected; the first port is connected to the discharge port of the compressor (28), the second port is connected to the indoor heat exchanger (11), and the third port is connected to the suction port of the compressor (28) through the gas-liquid separator (29); The second side of the first part (221) of the outdoor heat exchanger (22) is connected to the fourth port via the third electronic expansion valve (21), and the second side of the second part (222) of the outdoor heat exchanger (22) is connected to the fourth port.

5. The air conditioner according to claim 4, characterized in that: The air conditioner comprises a controller and a first temperature sensor, the controller being electrically connected to the first temperature sensor, the first temperature sensor being used to detect the indoor ambient temperature, the controller being electrically connected to the first electronic expansion valve (23), the second electronic expansion valve (24) and the third electronic expansion valve (21), and the controller being used to control the opening of the first electronic expansion valve (23), the second electronic expansion valve (24) and the third electronic expansion valve (21) when the temperature detected by the first temperature sensor reaches a preset temperature.

6. The air conditioner according to claim 5, characterized in that: It also includes a second temperature sensor electrically connected to the controller, the second temperature sensor is arranged in the first part (221), the second temperature sensor is used to detect the temperature of the first part (221), and the controller is used to open and close the solenoid valve (25).

7. The air conditioner according to any one of claims 4 to 6, characterized in that: A high-pressure protection switch is provided on the connecting pipeline between the discharge port of the compressor (28) and the first port.

8. The air conditioner according to claim 5, characterized in that: The controller is used to control the four-way reversing valve (27) to be in a first state in the heating mode, and to control the second electronic expansion valve (24) and the third electronic expansion valve (21) to be fully open and to control the first electronic expansion valve (23) to be in a throttling state.

9. The air conditioner according to claim 5, characterized in that: The controller is used to control the four-way reversing valve (27) to be in a second state in the cooling mode, and to control the second electronic expansion valve (24) and the third electronic expansion valve (21) to be fully open, and to control the first electronic expansion valve (23) to be in a throttling state, and to control the solenoid valve (25) to be in a conducting state.

10. The air conditioner according to claim 5, characterized in that: The controller is used to control the four-way reversing valve (27) to be in a first state in a continuous heating mode, and to control the second electronic expansion valve (24) and the third electronic expansion valve (21) to be in a throttling state and to control the first electronic expansion valve (23) to be fully open.

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