Air conditioner, control method thereof and computer readable storage medium

Abstract

The invention discloses an air conditioner, a control method of the air conditioner and a computer readable storage medium, the air conditioner comprises a compressor, a reversing device, an outdoor heat exchanger, an electronic expansion valve, a refrigerant ring, a variable flow throttle valve and an indoor heat exchanger which are connected in sequence, under the condition that the air conditioner runs in a refrigeration mode, the refrigerant flow is automatically adjusted so as to adapt to load changes; and the electronic expansion valve is configured to perform opening degree enlarging adjustment under the condition that the air conditioner does not perform reversing defrosting operation, and the opening degree is changed in a staged manner. According to the air conditioner, non-reversing defrosting can be achieved at low cost, the defrosting effect of the air conditioner is improved, and the risk that electric control is burnt due to short circuit is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular, to an air conditioner, a control method for an air conditioner, and a computer-readable storage medium. Background Art

[0002] At present, when an air conditioner operates in heating mode in winter, the outdoor heat exchanger continuously absorbs heat from the environment and maintains a relatively low temperature. When the outdoor ambient temperature is low, the temperature of the heat exchanger may be lower than 0 °C, and at this time, the heat exchanger will gradually frost. After the frost layer accumulates to a certain thickness, it will seriously affect the heating effect of the air conditioner. Therefore, the air conditioner needs to frequently defrost.

[0003] At present, during defrosting in related technologies, reverse defrosting treatment is mainly adopted, that is, during the heating process, it is necessary to switch to the cooling mode for defrosting. During this period, the air conditioner stops heating, and the indoor temperature will fluctuate greatly. At the same time, when the four-way valve switches, there will be a "click" abnormal sound, etc., reducing the user's heating experience. And the existing electronic valve flow path cannot balance the requirements of normal system operation and reverse defrosting, and the throttling element (such as a capillary tube) cannot balance the requirements of different flow rates for high and low loads of the system. In addition, in the existing technology, there is a method of setting an electronic expansion valve in the refrigerant flow path to replace the capillary tube for throttling. Although it can balance the requirements of different flow rates for high and low loads of the system when the air conditioner operates in cooling mode, this method increases the system cost. In addition, the existing electronic expansion valve usually fixes a lower limit opening to avoid the problem of condensate water generated when the throttled refrigerant flows through the refrigerant ring, resulting in an electrical control short circuit. It does not consider environmental factors and there is a risk of electrical control short circuit or even burnout. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems in the related technologies to some extent. To this end, the first object of the present invention is to provide an air conditioner. The variable flow throttle valve is configured to automatically adjust the refrigerant flow rate to adapt to the load change when the air conditioner operates in cooling mode; the electronic expansion valve is configured to increase the opening degree during the non-reversing defrosting operation of the air conditioner, and the opening degree changes in a stepwise manner, so as to achieve non-reversing defrosting at low cost, and reduce the risk of electrical control short circuit and burnout. It can ensure the heating effect of the air conditioner when the refrigerant flow rate is low, and ensure the throttling effect when the air conditioner is at low load, guarantee the reliability of the compressor oil return, and ensure sufficient flow rate when the air conditioner is at high load, so as to ensure the cooling effect of the air conditioner.

[0005] The second object of the present invention is to provide a control method for an air conditioner.

[0006] The third object of the present invention is to provide a computer-readable storage medium.

[0007] To achieve the above object, an embodiment of the first aspect of the present invention provides an air conditioner, comprising: a compressor, a reversing device, an outdoor heat exchanger, an electronic expansion valve, a refrigerant loop, a variable flow throttle valve, and an indoor heat exchanger connected in sequence, wherein the variable flow throttle valve is configured to automatically adjust the refrigerant flow rate to adapt to load changes when the air conditioner operates in a cooling mode; the electronic expansion valve is configured to increase the opening degree in a stepped manner when the air conditioner operates in a non-reversing defrosting mode.

[0008] For the air conditioner according to the embodiment of the present invention, the variable flow throttle valve is configured to automatically adjust the refrigerant flow rate to adapt to load changes when the air conditioner operates in a cooling mode; the electronic expansion valve is configured to increase the opening degree in a stepped manner when the air conditioner operates in a non-reversing defrosting mode. Thus, the air conditioner can achieve non-reversing defrosting at low cost, reduce the risk of short-circuit burnout of the electronic control, ensure the heating effect of the air conditioner when the refrigerant flow rate is low, ensure the throttling effect when the air conditioner is at low load, ensure the reliability of compressor oil return, and ensure sufficient flow rate when the air conditioner is at high load to ensure the cooling effect of the air conditioner.

[0009] In addition, the air conditioner according to the above embodiment of the present invention may further have the following additional technical features:

[0010] According to an embodiment of the present invention, the air conditioner further comprises: a controller configured to determine a lower limit opening degree of the electronic expansion valve according to the outdoor ambient temperature when the air conditioner operates in a cooling mode, and limit the opening degree of the electronic expansion valve according to the lower limit opening degree.

[0011] According to an embodiment of the present invention, the controller is further configured to set a first opening degree value as the lower limit opening degree when the outdoor ambient temperature is less than or equal to a first preset outdoor temperature; determine the lower limit opening degree according to a preset linear relationship when the outdoor ambient temperature is greater than the first preset outdoor temperature and less than or equal to a second preset outdoor temperature; set a second opening degree value as the lower limit opening degree when the outdoor ambient temperature is greater than the second preset outdoor temperature; wherein the preset linear relationship is a linear function with the outdoor ambient temperature as a variable, the first opening degree value is less than the minimum value of the preset linear relationship, and the maximum value of the preset linear relationship is less than the second opening degree value.

[0012] According to an embodiment of the present invention, the controller is further configured to, when the air conditioner operates in a non-reversing defrosting mode, obtain the current opening degree of the electronic expansion valve, and perform multiple increases in the opening degree of the electronic expansion valve according to the current opening degree, so that the opening degree of the electronic expansion valve changes in a stepped manner.

[0013] According to an embodiment of the present invention, the controller is further configured to determine a target opening degree and the number of opening degree adjustments of the electronic expansion valve, determine an adjustment step according to the current opening degree, the target opening degree and the number of opening degree adjustments, and perform multiple increasing adjustments on the opening degree of the electronic expansion valve according to the adjustment step.

[0014] According to an embodiment of the present invention, the air conditioner further includes: a controller, and the controller is further configured to obtain at least one of the indoor environmental temperature, the outdoor environmental temperature, and the outdoor heat exchanger temperature, and determine non-reversing defrost operation of the air conditioner according to at least one of the indoor environmental temperature, the outdoor environmental temperature, and the outdoor heat exchanger temperature.

[0015] According to an embodiment of the present invention, when the controller determines that none of the following conditions is satisfied, it controls the air conditioner to perform non-reversing defrost operation: (1) the indoor environmental temperature is less than a first preset temperature, or the outdoor environmental temperature is less than a second preset temperature, or the sum of the indoor environmental temperature and the outdoor environmental temperature is less than a third preset temperature; (2) the change value of the outdoor heat exchanger temperature is less than a fourth preset temperature; (3) the outdoor environmental temperature is less than a fifth preset temperature and the air conditioner has not entered the defrost mode within a second preset time, where the fifth preset temperature is greater than the second preset temperature.

[0016] According to an embodiment of the present invention, the controller is further configured to obtain a first temperature change value of the outdoor heat exchanger and a second temperature change value of the outdoor environmental temperature within a third preset time; determine the change value of the outdoor heat exchanger temperature according to the relationship between the first temperature change value and the second temperature change value.

[0017] According to an embodiment of the present invention, the controller is further configured to control the air conditioner to enter a first non-reversing defrost mode when the change value of the outdoor heat exchanger temperature is less than a sixth preset temperature; control the air conditioner to enter a second non-reversing defrost mode when the change value of the outdoor heat exchanger temperature is less than a seventh preset temperature; where the seventh preset temperature is less than the sixth preset temperature, and the sixth preset temperature is greater than the fourth preset temperature.

[0018] According to an embodiment of the present invention, the controller is further configured that when the air conditioner operates in the first non-reversing defrosting mode, if it is not detected that the opening degree of the electronic expansion valve changes, when the outdoor heat exchanger temperature is greater than the eighth preset temperature or the operation time of the first non-reversing defrosting mode is greater than the third preset time, the controller controls the air conditioner to exit the first non-reversing defrosting mode; if it is detected that the opening degree of the electronic expansion valve changes, after a fourth preset time delay, it is determined whether to exit the first non-reversing defrosting mode according to the outdoor heat exchanger temperature.

[0019] According to an embodiment of the present invention, the controller is further configured that when the air conditioner operates in the second non-reversing defrosting mode, if it is not detected that the opening degree of the electronic expansion valve changes, when the outdoor heat exchanger temperature is greater than the ninth preset temperature or the operation time of the second non-reversing defrosting mode is greater than the fifth preset time, the controller controls the air conditioner to exit the second non-reversing defrosting mode; if it is detected that the opening degree of the electronic expansion valve changes, after a sixth preset time delay, it is determined whether the air conditioner exits the second non-reversing defrosting mode according to the outdoor heat exchanger temperature; wherein, the ninth preset temperature is greater than the eighth preset temperature, and the fifth preset time is greater than the third preset time.

[0020] According to an embodiment of the present invention, the controller is further configured that when the air conditioner enters the first non-reversing defrosting mode, the controller controls the compressor to operate at the first operating frequency, the outdoor fan stops, and the rotational speed of the indoor fan remains unchanged; when the air conditioner enters the second non-reversing defrosting mode, the controller controls the compressor to operate at the second operating frequency, the outdoor fan stops, and the rotational speed of the indoor fan decreases at a preset rate; wherein, the first operating frequency is less than the second operating frequency.

[0021] According to an embodiment of the present invention, the electronic expansion valve is a wide-range variable-gain electronic expansion valve.

[0022] According to an embodiment of the present invention, the wide-range variable-gain electronic expansion valve is further configured to change the opening degree based on the load change when the air conditioner operates in heating mode.

[0023] According to an embodiment of the present invention, the wide-range variable-gain electronic expansion valve includes a valve body, an inlet and an outlet are provided on the valve body, a valve seat is provided at the outlet, a valve needle is provided on the valve seat, a throttle hole is formed by the gap between the valve needle and the valve seat, and the valve needle adjustment section is designed at multiple angles.

[0024] According to an embodiment of the present invention, the diameter range of the valve seat is 1.6 mm - 3.2 mm.

[0025] According to an embodiment of the present invention, the variable flow throttle valve includes: a housing, an installation channel is formed inside the housing, the housing has a first medium flow port and a second medium flow port, and the installation channel communicates with the first medium flow port and the second medium flow port; a first valve seat, the first valve seat is installed in the installation channel, the first valve seat is formed with an adjacent first hole and a first medium flow channel, the first medium flow channel communicates with the first medium flow port and the first hole, and the first hole is adapted to communicate the first medium flow channel and the second medium flow port; the first valve seat is further formed with an adjacent second hole and a second medium flow channel, the second medium flow channel communicates with the second medium flow port and the second hole, and the second hole is adapted to communicate the first medium flow port and the second medium flow channel; a first valve core, the first valve core is arranged in the first medium flow channel, and the first valve core can move along the first medium flow channel to open or close the first hole; a second valve core, the second valve core is arranged in the second medium flow channel, and the second valve core can move along the second medium flow channel to open or close the second hole.

[0026] According to an embodiment of the present invention, when the medium flows into the installation channel through the first medium flow port, the medium drives the first valve core to move to close the first hole and drives the second valve core to move to open the second hole; when the medium flows into the installation channel through the second medium flow port, the medium drives the first valve core to move to open the first hole and drives the second valve core to move to close the second hole; wherein, along the length direction of the installation channel, the first hole and the second hole are located between the first medium flow channel and the second medium flow channel.

[0027] According to an embodiment of the present invention, a throttle channel and a conduction channel are further formed inside the housing, the throttle channel communicates with the first medium flow port and the second hole, and the conduction channel communicates with the second medium flow port and the first hole, wherein, the throttle channel and / or the conduction channel are formed on the first valve seat.

[0028] According to an embodiment of the present invention, a first communication flow channel is formed between the first valve seat and the housing, the first communication flow channel communicates with the throttle channel and the first medium flow port; a second communication flow channel is formed between the first valve seat and the housing, the second communication flow channel communicates with the conduction channel and the second medium flow port.

[0029] According to one embodiment of the present invention, a first limiter is provided in the first medium flow channel, the first limiter is located on the side of the first valve core away from the first hole, the first limiter forms a third connecting flow channel connecting the first medium flow channel and the first medium flow port, and the first limiter is suitable for cooperating with the first valve core in a limiting manner; a second limiter is provided in the second medium flow channel, the second limiter is located on the side of the second valve core away from the second hole, the second limiter forms a fourth connecting flow channel connecting the second medium flow channel and the second medium flow port, and the second limiter is suitable for cooperating with the second valve core in a limiting manner.

[0030] According to one embodiment of the present invention, the variable flow throttle valve further includes: an elastic member, which is assembled in the second medium flow channel and located between the second valve core and the second limit member, and the elastic member is connected between the second valve core and the second limit member.

[0031] According to one embodiment of the present invention, the second valve core includes: a valve core body and a closing column connected to each other, and the closing column is used to open or close the first hole.

[0032] According to one embodiment of the present invention, the valve core body is cylindrical, or at least one notch is formed on a side wall of the valve core body.

[0033] According to one embodiment of the present invention, the variable flow throttle valve further includes: a first filter element, which is installed in the installation channel and located between the first valve seat and the first medium flow port; and a second filter element, which is installed in the installation channel and located between the first valve seat and the second medium flow port.

[0034] To achieve the above-mentioned purpose, the second embodiment of the present invention proposes a control method for an air conditioner, wherein the air conditioner includes: a compressor, a reversing device, an outdoor heat exchanger, an electronic expansion valve, a refrigerant ring, a variable flow throttle valve and an indoor heat exchanger connected in sequence, and the method includes: determining the operating conditions of the air conditioner; when the air conditioner is in cooling operation, automatically adjusting the refrigerant flow based on the variable flow throttle valve to adapt to load changes; when the air conditioner is in non-reversing defrosting operation, adjusting the opening of the electronic expansion valve to increase, and the opening changes in stages.

[0035] The control method of an air conditioner according to an embodiment of the present invention determines the operating conditions of the air conditioner. When the air conditioner operates in cooling mode, the refrigerant flow rate is automatically adjusted based on a variable flow throttle valve to adapt to load changes. When the air conditioner operates in non-reversing defrost mode, the opening of the electronic expansion valve is adjusted to increase, and the opening changes in a stepwise manner. Thus, this method can achieve non-reversing defrost at low cost and reduce the risk of short circuit and burnout of the electronic control. It can ensure the heating effect of the air conditioner when the refrigerant flow rate is low, ensure the throttling effect when the air conditioner is at low load, guarantee the reliability of compressor oil return, and ensure sufficient flow rate when the air conditioner is at high load to ensure the cooling effect of the air conditioner.

[0036] In addition, the air conditioner according to the above embodiment of the present invention may further have the following additional technical features:

[0037] According to an embodiment of the present invention, determining the lower limit opening of the electronic expansion valve according to the outdoor ambient temperature includes: when the outdoor ambient temperature is less than or equal to the first preset outdoor temperature, setting the first opening value as the lower limit opening; when the outdoor ambient temperature is greater than the first preset outdoor temperature and less than or equal to the second preset outdoor temperature, determining the lower limit opening according to a preset linear relationship; when the outdoor ambient temperature is greater than the second preset outdoor temperature, setting the second opening value as the lower limit opening; wherein, the preset linear relationship is a linear function with the outdoor ambient temperature as a variable, the first opening value is less than the minimum value of the preset linear relationship, and the maximum value of the preset linear relationship is less than the second opening value.

[0038] According to an embodiment of the present invention, adjusting the opening of the electronic expansion valve to increase, and the opening changes in a stepwise manner, includes: obtaining the current opening of the electronic expansion valve, and performing multiple increases in the opening of the electronic expansion valve according to the current opening, so that the opening of the electronic expansion valve changes in a stepwise manner.

[0039] According to an embodiment of the present invention, performing multiple increases in the opening of the electronic expansion valve according to the current opening includes: determining the target opening and the number of opening adjustments of the electronic expansion valve, determining the adjustment step according to the current opening, the target opening and the number of opening adjustments, and performing multiple increases in the opening of the electronic expansion valve according to the adjustment step.

[0040] According to an embodiment of the present invention, the control method of the air conditioner further includes: obtaining at least one of the indoor ambient temperature, the outdoor ambient temperature and the outdoor heat exchanger temperature, and determining the non-reversing defrost operation of the air conditioner according to at least one of the indoor ambient temperature, the outdoor ambient temperature and the outdoor heat exchanger temperature.

[0041] According to an embodiment of the present invention, when it is determined that none of the following conditions is satisfied, the air conditioner is controlled not to perform defrosting operation with commutation: (1) the indoor ambient temperature is less than a first preset temperature, or the outdoor ambient temperature is less than a second preset temperature, or the sum of the indoor ambient temperature and the outdoor ambient temperature is less than a third preset temperature; (2) the change value of the outdoor heat exchanger temperature is less than a fourth preset temperature; (3) the outdoor ambient temperature is less than a fifth preset temperature and the air conditioner does not enter the defrosting mode within a second preset time, where the fifth preset temperature is greater than the second preset temperature.

[0042] According to an embodiment of the present invention, the control method of the air conditioner further includes: obtaining a first temperature change value of the outdoor heat exchanger and a second temperature change value of the outdoor ambient temperature within a third preset time; determining the change value of the outdoor heat exchanger temperature according to the relationship between the first temperature change value and the second temperature change value.

[0043] According to an embodiment of the present invention, the control method of the air conditioner further includes: when the change value of the outdoor heat exchanger temperature is less than a sixth preset temperature, controlling the air conditioner to enter a first non-commutation defrosting mode; when the change value of the outdoor heat exchanger temperature is less than a seventh preset temperature, controlling the air conditioner to enter a second non-commutation defrosting mode; where the seventh preset temperature is less than the sixth preset temperature, and the sixth preset temperature is greater than the fourth preset temperature.

[0044] According to an embodiment of the present invention, when the air conditioner operates in the first non-commutation defrosting mode, the method further includes: if it is not detected that the opening degree of the electronic expansion valve changes, when the outdoor heat exchanger temperature is greater than an eighth preset temperature or the operation time of the first non-commutation defrosting mode is greater than a third preset time, controlling the air conditioner to exit the first non-commutation defrosting mode; if it is detected that the opening degree of the electronic expansion valve changes, after a fourth preset time delay, determining whether the air conditioner exits the first non-commutation defrosting mode according to the outdoor heat exchanger temperature.

[0045] According to an embodiment of the present invention, when the air conditioner operates in the second non-reversing defrosting mode, the method further includes: if it is detected that the opening degree of the electronic expansion valve does not change, when the temperature of the outdoor heat exchanger is greater than a ninth preset temperature or the operating time of the second non-reversing defrosting mode is greater than a fifth preset time, controlling the air conditioner to exit the second non-reversing defrosting mode; if it is detected that the opening degree of the electronic expansion valve changes, after a sixth preset time delay, determining whether the air conditioner exits the second non-reversing defrosting mode according to the temperature of the outdoor heat exchanger; wherein, the ninth preset temperature is greater than an eighth preset temperature, and the fifth preset time is greater than the third preset time.

[0046] According to an embodiment of the present invention, the control method of the air conditioner further includes: when the air conditioner enters the first non-reversing defrosting mode, controlling the compressor to operate at a first operating frequency, stopping the outdoor fan, and keeping the rotational speed of the indoor fan unchanged; when the air conditioner enters the second non-reversing defrosting mode, controlling the compressor to operate at a second operating frequency, stopping the outdoor fan, and reducing the rotational speed of the indoor fan at a preset rate; wherein, the first operating frequency is less than the second operating frequency.

[0047] To achieve the above object, a third aspect embodiment of the present invention proposes a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the above control method of the air conditioner is implemented.

[0048] According to the computer-readable storage medium of the embodiment of the present invention, by implementing the above control method of the air conditioner when executed, it is possible to achieve non-reversing defrosting at low cost, reduce the risk of short-circuit burning of the electronic control, ensure the heating effect of the air conditioner when the refrigerant flow rate is low, ensure the throttling effect when the air conditioner is at low load, ensure the reliability of the compressor oil return, ensure sufficient flow when the air conditioner is at high load, and ensure the refrigeration effect of the air conditioner.

[0049] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Description of the Drawings

[0050] Figure 1 Schematic diagram of the system of the air conditioner according to an embodiment of the present invention;

[0051] Figure 2 Block diagram of the air conditioner in the prior art;

[0052] Figure 3 Block diagram of the air conditioner in the prior art;

[0053] Figure 4Schematic diagram of a variable flow throttle valve according to an embodiment of the present invention;

[0054] Figure 5 Schematic diagram of an electronic expansion valve according to an embodiment of the present invention;

[0055] Figure 6 Schematic diagram of an electronic expansion valve according to another embodiment of the present invention;

[0056] Figure 7 Schematic structural diagram of a variable flow throttle valve according to an embodiment of the present invention;

[0057] Figure 8 Flowchart of a control method for an air conditioner according to an embodiment of the present invention;

[0058] Figure 9 Flowchart of a control method for an air conditioner according to a specific example of the present invention. Detailed implementation manners

[0059] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0060] As Figure 2 shown, currently, in an air conditioner system, an electronic expansion valve and a capillary tube are provided between an evaporator and a condenser. When the air conditioner operates in a cooling mode, the refrigerant passing through the evaporator can be throttled through the capillary tube. However, the throttling method through the capillary tube cannot take into account the requirements of different flow rates at high and low loads of the system. In addition, as Figure 3 shown, in order to be able to take into account the requirements of different flow rates at high and low loads of the system, an electronic expansion valve is provided between an outdoor heat exchanger and an indoor heat exchanger. By adjusting the opening degree of the electronic expansion valve, the refrigerant flow rate in the refrigerant circuit can be adjusted. Although this method can take into account the requirements of different flow rates at high and low loads of the system, this method increases the system cost. For this reason, the present invention proposes an air conditioner that can reduce costs by providing a variable flow throttle valve and can automatically adjust the refrigerant flow rate to adapt to load changes.

[0061] The air conditioner, the control method of the air conditioner, and the computer-readable storage medium proposed by the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0062] Figure 1 System schematic diagram of an air conditioner according to an embodiment of the present invention.

[0063] As Figure 1As shown, the air conditioner 100 of the present invention may include a compressor 70, a reversing device 60, an outdoor heat exchanger 20, an electronic expansion valve 40, a refrigerant loop 50, a variable flow throttle valve 30, and an indoor heat exchanger 10 connected in sequence.

[0064] Among them, the variable flow throttle valve 30 is configured to automatically adjust the refrigerant flow rate to adapt to the load change when the air conditioner 100 operates in the cooling mode. The electronic expansion valve 40 is configured to increase the opening degree in a stepped manner when the air conditioner 100 operates in the non-reversing defrosting mode.

[0065] Specifically, referring to Figure 1 As shown, the variable flow throttle valve 30 is arranged on the left side of the refrigerant loop 50, and the electronic expansion valve 40 is arranged on the right side of the refrigerant loop 50. Thus, during the cooling process of the air conditioner 100, the refrigerant first passes through the electronic expansion valve 40, then through the refrigerant loop 50, and then flows to the variable flow throttle valve 30 for throttling. After the refrigerant passes through the electronic expansion valve 40, it is necessary to ensure that the temperature of the refrigerant entering the refrigerant loop 50 in the electronic control unit does not become too low. That is, when the temperature is too low, condensation water will be generated below the dew point temperature of the air, which may cause the risk of short circuit in the electronic control unit. Among them, the refrigerant loop 50 is used to dissipate heat from the electronic control unit to improve the reliability of the electronic control unit during operation. In addition, referring to Figure 4, when the air conditioner 100 operates in the cooling mode, the refrigerant flows in from the F direction and out from the C direction of the variable flow throttle valve 30, and has a wide flow adjustment range, which can achieve the required throttling effect under different working conditions and frequencies of the air conditioner 100, that is, the refrigerant flow rate can be automatically adjusted to adapt to the load change when the air conditioner 100 operates in the cooling mode. When the air conditioner 100 operates in the heating mode, usually more heat needs to be transferred to the indoor space. The refrigerant flows in from the C direction and out from the F direction of the variable flow throttle valve 30, and does not have a throttling effect, thereby improving the heating effect of the air conditioner 100.

[0066] More specifically, when the air conditioner 100 operates in the cooling mode, the variable flow throttle valve 30 can adjust the refrigerant flow rate. For example, referring to Figure 1As shown, when the air conditioner 100 operates in the cooling mode, the refrigerant can flow from the compressor 70 to the outdoor heat exchanger 20 after the four-way valve 60 is switched. The high-temperature and high-pressure gaseous refrigerant releases heat in the outdoor heat exchanger 20 and condenses into a liquid by contacting the air in the outdoor environment. The high-temperature and high-pressure liquid refrigerant first passes through the electronic expansion valve 40. Passing through the electronic expansion valve 40 reduces the temperature and pressure of the refrigerant and makes it flow to the refrigerant loop 50 to dissipate heat for the electronic control components, and then flows to the variable flow throttle valve 30, which can automatically adjust the flow according to the pressure of the refrigerant. For example, when the pressure of the refrigerant is low, the flow of the refrigerant can be reduced to ensure the throttling effect and the reliability of oil return of the compressor 70. When the pressure of the refrigerant is high, the flow of the refrigerant can be increased to improve the cooling effect of the air conditioner 100. That is, when the refrigerant flows to the indoor heat exchanger 10, the refrigerant passes through the indoor heat exchanger 10, absorbs the heat in the indoor air, causing the refrigerant to undergo a phase change from liquid to gas and reducing the indoor temperature. The gaseous refrigerant returns to the compressor 70 again after passing through the four-way valve 60 to do work and be compressed, increasing its pressure and temperature to become a high-temperature and high-pressure gaseous refrigerant. Among them, the indoor heat exchanger 10 can be an evaporator, and the outdoor heat exchanger 20 can be a condenser. When the air conditioner 100 operates in the cooling mode, by using the variable flow throttle valve 30 to replace the electronic expansion valve to adjust the flow rate of the refrigerant, the cost can be reduced, and using the variable flow throttle valve 30 to replace the capillary tube can achieve automatic adjustment of the refrigerant flow rate.

[0067] When the air conditioner 100 operates in the heating mode, the refrigerant can flow from the compressor 70 to the indoor heat exchanger 10 after the four-way valve 60 is switched. The high-temperature and high-pressure gaseous refrigerant releases heat in the indoor heat exchanger 10, cools and condenses into a liquid by contacting the indoor air, and releases heat to increase the indoor temperature. Then it flows to the variable flow throttle valve 30. The variable flow throttle valve 30 does not throttle when the air conditioner 100 is in the heating mode. After passing through the refrigerant loop 50, it flows to the electronic expansion valve 40 to reduce the pressure of the refrigerant, and the flow rate of the refrigerant can also be reduced through the electronic expansion valve 40. By reducing the flow rate of the refrigerant, the residence time of the refrigerant in the outdoor heat exchanger 20 can be increased, so that more heat can be absorbed and transferred to the refrigerant, thereby improving the heating effect, and it can also prevent the refrigerant in the indoor heat exchanger 10 from overheating and avoid the reduction of the heating effect caused by overheating. The low-temperature and low-pressure gaseous refrigerant absorbs heat from the air in the outdoor heat exchanger 20, causing the refrigerant to undergo a phase change from gas to liquid. After passing through the four-way valve 60, it returns to the compressor 70 again to do work and be compressed, increasing its pressure and temperature to become a high-temperature and high-pressure gaseous refrigerant.

[0068] When the outdoor ambient temperature is relatively low, the temperature of the outdoor heat exchanger 20 may be lower than 0 degrees Celsius. At this time, the outdoor heat exchanger 20 will gradually frost. After the frost layer accumulates to a certain thickness, it will seriously affect the heating effect of the air conditioner 100. Therefore, when the air conditioner 100 operates in the non-reversing defrosting mode, the opening degree of the electronic expansion valve 40 can be adjusted to become larger, so that the refrigerant flow rate in the pipeline is relatively large, ensuring the defrosting effect during non-reversing defrosting. That is, by increasing the refrigerant flow rate through the electronic expansion valve 40, it is ensured that a large flow of refrigerant flows to the outdoor heat exchanger 20 to utilize the sensible heat of the high-temperature refrigerant to deal with the frost layer on the surface of the outdoor heat exchanger 20. Moreover, during the process of adjusting the opening degree of the electronic expansion valve 40 to become larger, the opening degree changes in a stepwise manner. That is to say, when the air conditioner 100 is in non-reversing defrosting, it is necessary to increase the opening degree of the electronic expansion valve 40 to increase the flow rate, and the opening degree span will be relatively large. If the opening degree changes too quickly, it will bring refrigerant abnormal noise, and if the opening degree changes too slowly, it will affect the defrosting effect. Therefore, making the opening degree change in a stepwise manner can reduce problems such as refrigerant abnormal noise and improve the defrosting effect. Among them, the indoor heat exchanger 10 can be a condenser, and the outdoor heat exchanger 20 can be an evaporator.

[0069] Thus, when the air conditioner operates in the cooling mode, the variable flow throttle valve is configured to automatically adjust the refrigerant flow rate in the case of the air conditioner operating in the cooling mode to adapt to the load change. The electronic expansion valve is configured to perform an opening degree increase adjustment in the case of the air conditioner operating in the non-reversing defrosting mode, and the opening degree changes in a stepwise manner., which can achieve non-reversing defrosting at low cost and reduce the risk of the electronic control short-circuit burning. It can ensure the heating effect of the air conditioner when the refrigerant flow rate is low, ensure the throttling effect when the air conditioner is at low load, ensure the reliability of the compressor oil return, and ensure sufficient flow rate when the air conditioner is at high load to ensure the cooling effect of the air conditioner.

[0070] According to an embodiment of the present invention, as Figure 1 shown, the air conditioner 100 further includes: a controller 80 (not shown in the figure), and the controller 80 is configured to determine the lower limit opening degree of the electronic expansion valve 40 according to the outdoor ambient temperature in the case of the air conditioner 100 operating in the cooling mode, and limit the opening degree of the electronic expansion valve 40 according to the lower limit opening degree.

[0071] Specifically, when the air conditioner 100 operates in the cooling mode, the controller 80 can determine the lower limit opening degree of the electronic expansion valve 40 according to the outdoor ambient temperature. For example, the electronic expansion valve 40 can be controlled according to the outdoor ambient temperature to limit the opening degree of the electronic expansion valve 40. For example, the outdoor ambient temperature can be obtained through the outdoor temperature sensor. Different outdoor ambient temperatures result in different opening degrees when controlling the electronic expansion valve 40. For example, the higher the outdoor ambient temperature, the larger the lower limit opening degree of the electronic expansion valve 40, and the lower the outdoor ambient temperature, the smaller the lower limit opening degree of the electronic expansion valve 40. This can prevent the pipe temperature in the refrigerant loop from being lower than the dew point temperature corresponding to its surrounding environment, where air will generate condensed water in the refrigerant loop, leading to problems such as short-circuiting and burning out the electronic control or even the entire unit. Moreover, the setting of the opening degree is more reasonable, ensuring reliability while fully exerting the cooling capacity.

[0072] In addition, the electronic expansion valve 40 can also be controlled according to the temperature range of the outdoor ambient temperature to limit the opening degree of the electronic expansion valve 40. For example, the outdoor ambient temperature can be obtained through the outdoor temperature sensor, and the temperature range of the outdoor ambient temperature can be judged. Different temperature ranges result in different opening degrees when controlling the electronic expansion valve 40. For example, in the temperature range with a higher outdoor ambient temperature, the lower limit opening degree of the electronic expansion valve 40 is larger, and in the temperature range with a lower outdoor ambient temperature, the lower limit opening degree of the electronic expansion valve 40 is smaller. This can prevent the pipe temperature in the refrigerant loop from being lower than the dew point temperature corresponding to its surrounding environment, where air will generate condensed water in the refrigerant loop, leading to problems such as short-circuiting and burning out the electronic control or even the entire unit. Moreover, the setting of the opening degree is more reasonable, ensuring reliability while fully exerting the cooling capacity.

[0073] According to an embodiment of the present invention, the controller 80 is further configured to set the first opening value as the lower limit opening degree when the outdoor ambient temperature is less than or equal to the first preset outdoor temperature; determine the lower limit opening degree according to a preset linear relationship when the outdoor ambient temperature is greater than the first preset outdoor temperature and less than or equal to the second preset outdoor temperature; and set the second opening value as the lower limit opening degree when the outdoor ambient temperature is greater than the second preset outdoor temperature. Wherein, the preset linear relationship is a linear function with the outdoor ambient temperature as a variable, the first opening value is less than the minimum value of the preset linear relationship, and the maximum value of the preset linear relationship is less than the second opening value. The first preset outdoor temperature and the second preset outdoor temperature can be determined according to the actual situation, and the first opening value and the second opening value can be determined according to the actual situation.

[0074] Specifically, when the air conditioner 100 operates in the cooling mode, the current electronic expansion valve is usually fixedly set with a lower limit opening to avoid the problem that the refrigerant after excessive throttling generates condensed water when flowing through the refrigerant loop 50, resulting in a short circuit of the electronic control. However, the actual dew point temperature changes with the outdoor ambient temperature. Therefore, a more reasonable lower limit opening needs to be set at different ambient temperatures to give full play to the adjustment ability of the refrigeration system while ensuring reliability. Thus, the purpose of controlling the lower limit opening of the electronic expansion valve 40 when the air conditioner operates in the cooling mode is to avoid the generation of condensed water in the refrigerant loop 50 structure during refrigeration, resulting in the short circuit and burnout of the electronic control. If the refrigerant is excessively throttled when passing through the electronic expansion valve 40, it will cause the tube temperature in the refrigerant loop 50 to be lower than the dew point temperature corresponding to its surrounding environment. At this time, air will generate condensed water in the refrigerant loop 50. Since the refrigerant loop 50 is in direct contact with the electronic control board, the generated condensed water will contact the components in the electronic control board, resulting in its short circuit and burnout of the electronic control and even the whole machine, posing a great potential safety hazard.

[0075] Judge the outdoor ambient temperature. When the outdoor ambient temperature is less than or equal to the first preset outdoor temperature, for example, the first preset outdoor temperature can be set to 20 degrees Celsius, and the outdoor ambient temperature can be obtained through a temperature sensor. For example, when the obtained outdoor ambient temperature is 15 degrees Celsius, the first opening value can be set as the lower limit opening of the electronic expansion valve 40. For example, the opening of 370 pulse counts is used as the lower limit opening of the electronic expansion valve 40.

[0076] Judge the outdoor ambient temperature. When the outdoor ambient temperature is greater than the first preset outdoor temperature and less than or equal to the second preset outdoor temperature, for example, the first preset outdoor temperature can be set to 20 degrees Celsius, and the second preset outdoor temperature can be set to 40 degrees Celsius. When the obtained outdoor ambient temperature is 30 degrees Celsius, the lower limit opening of the electronic expansion valve 40 can be determined according to a preset linear relationship, that is, the preset linear relationship is a linear function with the outdoor ambient temperature as a variable. One outdoor ambient temperature corresponds to a lower limit opening of the electronic expansion valve 40. After determining the outdoor ambient temperature, the lower limit opening of the electronic expansion valve 40 can be obtained according to the preset linear relationship, and the first opening value is less than the minimum value of the preset linear relationship. For example, the preset linear relationship can be Lrmin = a*T4 + b, where a can be 2.5, b can be 320, T4 is the outdoor ambient temperature, and Lrmin is the lower limit opening of the electronic expansion valve 40. Thus, after determining the outdoor ambient temperature T4, the lower limit opening of the electronic expansion valve 40 can be determined according to the preset linear relationship.

[0077] Judge the outdoor ambient temperature. When the outdoor ambient temperature is greater than the second preset outdoor temperature, for example, when the obtained outdoor ambient temperature is 50 degrees Celsius and is greater than the second preset outdoor temperature of 40 degrees Celsius, the second opening value can be set to the lower limit opening of the electronic expansion valve 40. For example, the opening of 420 pulse counts can be used as the lower limit opening of the electronic expansion valve 40. In addition, the maximum value of the preset linear relationship is less than the second opening value.

[0078] According to an embodiment of the present invention, the controller 80 is further configured to, when the air conditioner 100 is not operating in a reverse defrost mode, obtain the current opening of the electronic expansion valve 40, and perform multiple increasing adjustments on the opening of the electronic expansion valve 40 according to the current opening, so that the opening of the electronic expansion valve 40 changes in a stepwise manner.

[0079] Specifically, when the air conditioner 100 is operating in a non-reverse defrost mode, it is necessary to increase the opening of the electronic expansion valve 40 to increase the flow rate, and the opening span is relatively large. If the opening changes too quickly during this process, it will cause refrigerant abnormal noise, and if it changes too slowly, it will affect the defrosting effect. Therefore, when the air conditioner 100 is operating in a non-reverse defrost mode, the controller 80 can obtain the current opening of the electronic expansion valve 40. After obtaining the current opening of the electronic expansion valve 40, multiple increasing adjustments can be performed on the opening of the electronic expansion valve 40 according to the current opening. For example, each time the opening is increased by a preset opening value, so that the opening of the electronic expansion valve 40 changes in a stepwise manner, thereby weakening problems such as refrigerant abnormal noise.

[0080] According to an embodiment of the present invention, the controller 80 is further configured to determine the target opening and the number of opening adjustments of the electronic expansion valve 40, determine the adjustment step according to the current opening, the target opening and the number of opening adjustments, and perform multiple increasing adjustments on the opening of the electronic expansion valve 40 according to the adjustment step.

[0081] Specifically, when the air conditioner 100 is operating in a non-reverse defrost mode, it is necessary to increase the opening of the electronic expansion valve 40 to increase the flow rate, and the opening span is relatively large. If the opening changes too quickly during this process, it will cause refrigerant abnormal noise, and if it changes too slowly, it will affect the defrosting effect. Therefore, when the air conditioner 100 is operating in a non-reverse defrost mode, the controller 80 can obtain the current opening of the electronic expansion valve 40. After obtaining the current opening of the electronic expansion valve 40, the target opening and the number of opening adjustments can be determined first. After determining the target opening and the number of opening adjustments, the adjustment step can be determined according to the current opening, the target opening and the number of opening adjustments. For example, the adjustable opening Lr of the electronic expansion valve 40 can be calculated according to the formula, that is, Lr = (Lraim - Lrx) / N, where Lr is the adjustable opening of the electronic expansion valve 40, Lraim is the target opening, Lrx is the current opening, and N is the number of opening adjustments, and its value can be 6.

[0082] Thus, after determining the adjustment step of the electronic expansion valve 40 based on the current opening degree, the target opening degree, and the number of opening degree adjustments, the opening degree of the electronic expansion valve 40 can be adjusted to increase by the adjustment step multiple times. That is to say, when increasing the opening degree of the electronic expansion valve 40, within a preset time period, such as within 5 seconds, the opening degree of the electronic expansion valve 40 can change by at most Lr each time. Through multiple increasing adjustments, it is adjusted to the target opening degree until it reaches the target opening degree. Among them, the target opening degree can be determined according to the heat required during defrosting. Thus, problems such as refrigerant abnormal noise can be weakened by adjusting the opening degree multiple times to increase it.

[0083] According to an embodiment of the present invention, the air conditioner 100 further includes: a controller 80, and the controller 80 is further configured to obtain at least one of the indoor ambient temperature, the outdoor ambient temperature, and the outdoor heat exchanger temperature, and determine the non-reversing defrost operation of the air conditioner 100 according to at least one of the indoor ambient temperature, the outdoor ambient temperature, and the outdoor heat exchanger temperature.

[0084] Further, according to an embodiment of the present invention, when the controller 80 determines that none of the following conditions are satisfied, it controls the air conditioner 100 to perform non-reversing defrost operation: (1) the indoor ambient temperature is less than the first preset temperature, or the outdoor ambient temperature is less than the second preset temperature, or the sum of the indoor ambient temperature and the outdoor ambient temperature is less than the third preset temperature; (2) the change value of the temperature of the outdoor heat exchanger 20 is less than the fourth preset temperature; (3) the outdoor ambient temperature is less than the fifth preset temperature and the air conditioner 100 has not entered the defrost mode within the second preset time, where the fifth preset temperature is greater than the second preset temperature. Among them, the first preset temperature, the second preset temperature, the third preset temperature, the fourth preset temperature, and the fifth preset temperature can be determined according to the actual situation.

[0085] Specifically, when determining whether the air conditioner 100 enters the non-reversing defrost mode, the following preset conditions can be used for judgment. Compare the outdoor ambient temperature with the first preset temperature, the indoor ambient temperature with the second preset temperature, and the sum of the indoor ambient temperature and the outdoor ambient temperature with the third preset temperature. When the indoor ambient temperature is less than the first preset temperature, or the outdoor ambient temperature is less than the second preset temperature, or the sum of the indoor ambient temperature and the outdoor ambient temperature is less than the third preset temperature, it can be determined that the first judgment condition is satisfied.

[0086] Compare the change value of the temperature of the outdoor heat exchanger 20 with the fourth preset temperature. When the change value of the temperature of the outdoor heat exchanger 20 is less than the fourth preset temperature, it can be determined that the second judgment condition is satisfied. Among them, the change value of the temperature of the outdoor heat exchanger 20 can be calculated according to the temperature change of the outdoor heat exchanger 20 over a certain period of time.

[0087] Compare the outdoor ambient temperature with the fifth preset temperature. When the outdoor ambient temperature is less than the fifth preset temperature, it is also necessary to determine whether the air conditioner 100 enters the defrosting mode within the second preset time. When the outdoor ambient temperature is less than the fifth preset temperature and the air conditioner 100 does not enter the defrosting mode within the second preset time, it can be determined that the third judgment condition is met.

[0088] Thus, when the first judgment condition, the second judgment condition, and the third judgment condition are all not met, the controller 80 can control the air conditioner 100 to enter the non-reversing defrosting mode.

[0089] In addition, when the controller 80 determines that any one of the preset conditions is met, it can control the four-way valve 60 to reverse, so that the air conditioner 100 enters the reversing defrosting mode. For example, when the indoor ambient temperature is less than the first preset temperature, or the outdoor ambient temperature is less than the second preset temperature, or the sum of the indoor ambient temperature and the outdoor ambient temperature is less than the third preset temperature, control the four-way valve 60 to reverse, so that the air conditioner 100 enters the reversing defrosting mode. Another example is that when the temperature change value of the outdoor heat exchanger 20 is less than the fourth preset temperature, control the four-way valve 60 to reverse, so that the air conditioner 100 enters the reversing defrosting mode. Another example is that when the outdoor ambient temperature is less than the fifth preset temperature and does not enter the defrosting mode within the second preset time, control the four-way valve 60 to reverse, so that the air conditioner 100 enters the reversing defrosting mode.

[0090] When the air conditioner 100 enters the reversing defrosting mode, the controller 80 controls the compressor 70 to stop, then switches the direction of the four-way valve 60, and then starts the compressor 70 again to operate in the defrosting mode, that is, operates in the refrigeration mode to defrost the outdoor heat exchanger 20.

[0091] According to an embodiment of the present invention, the controller 80 is further configured to obtain a first temperature change value of the outdoor heat exchanger 20 and a second temperature change value of the outdoor ambient temperature within the third preset time; determine the temperature change value of the outdoor heat exchanger 20 according to the relationship between the first temperature change value and the second temperature change value, wherein the preset coefficient is determined by the magnitude of the second temperature change value. The third preset time can be determined according to the actual situation.

[0092] Specifically, when determining the temperature change value of the outdoor heat exchanger 20, since the change in the outdoor ambient temperature affects the temperature change of the outdoor heat exchanger 20, when the air conditioner 100 operates in a non-reversing defrost mode, the determination value of the temperature change value of the outdoor heat exchanger 20 is relatively small, so it needs to be corrected. That is, after the air conditioner 100 starts heating and the compressor 70 starts, within the third preset time, the first temperature change value of the outdoor heat exchanger 20 and the second temperature change value of the outdoor ambient temperature are obtained. That is, at the beginning of the third preset time, the temperature of the outdoor heat exchanger 20 can be recorded as T30, and at the end of the third preset time, the temperature of the outdoor heat exchanger 20 can be recorded as T3, as well as the outdoor ambient temperatures T40 and T4 at the corresponding moments. Thus, the temperature change value of the outdoor heat exchanger 20 can be determined according to the relationship between the first temperature change value and the second temperature change value. For example, the temperature change value of the outdoor heat exchanger 20 can be determined by the difference between the first temperature change value and the product of the second temperature change value and a preset coefficient. The temperature change value of the outdoor heat exchanger 20 can be calculated by ΔT3 = (T3 - T30) - M*(T4 - T40). Where M is a preset coefficient, which can be segmented according to the outdoor ambient temperature and the temperature change amount of the outdoor heat exchanger 20. For example, when |T4 - T40| ≥ 6°C, the value of M can be 1, and when |T4 - T40| < 6°C, the value of M can be 0.9.

[0093] According to an embodiment of the present invention, the controller 80 is further configured to control the air conditioner 100 to enter the first non-reversing defrost mode when the temperature change value of the outdoor heat exchanger 20 is less than the sixth preset temperature; and control the air conditioner 100 to enter the second non-reversing defrost mode when the temperature change value of the outdoor heat exchanger 20 is less than the seventh preset temperature; where the seventh preset temperature is less than the sixth preset temperature, and the sixth preset temperature is greater than the fourth preset temperature. The sixth preset temperature and the seventh preset temperature can be determined according to the actual situation.

[0094] Specifically, when controlling the air conditioner 100 to enter the non-reversing defrost mode, it can be determined whether to enter the first non-reversing defrost mode or the second reversing defrost mode according to the temperature change value of the outdoor heat exchanger 20. Compare the temperature change value of the outdoor heat exchanger 20 with the sixth preset temperature. When the temperature change value of the outdoor heat exchanger 20 is less than the sixth preset temperature, the air conditioner 100 can be controlled to enter the first non-reversing defrost mode. When the temperature change value of the outdoor heat exchanger 20 is less than the seventh preset temperature, the air conditioner 100 can be controlled to enter the second non-reversing defrost mode. Where the seventh preset temperature is less than the sixth preset temperature, and the sixth preset temperature is greater than the fourth preset temperature.

[0095] That is to say, when the change value of the temperature of the outdoor heat exchanger 20 is less than the sixth preset temperature, it indicates that the frost layer on the current outdoor heat exchanger 20 is relatively thin and the temperature change of the outdoor heat exchanger 20 is relatively large. The first non-reversing defrosting mode can be entered to melt the frost layer on the outdoor heat exchanger 20. When the change value of the temperature of the outdoor heat exchanger 20 is less than the seventh preset temperature, it indicates that the frost layer on the current outdoor heat exchanger 20 is relatively thick and the temperature change of the outdoor heat exchanger 20 is relatively small. The second non-reversing defrosting mode can be entered to melt the frost layer on the outdoor heat exchanger 20.

[0096] According to an embodiment of the present invention, the controller 80 is further configured to, when the air conditioner 100 operates in the first non-reversing defrosting mode, if the opening degree of the electronic expansion valve 40 is not detected to change, then when the temperature of the outdoor heat exchanger 20 is greater than the eighth preset temperature or the operation time of the first non-reversing defrosting mode is greater than the third preset time, control the air conditioner 100 to exit the first non-reversing defrosting mode; if the opening degree of the electronic expansion valve 40 is detected to change, then after delaying the fourth preset time, determine whether the air conditioner 100 exits the first non-reversing defrosting mode according to the temperature of the outdoor heat exchanger 20. Among them, the eighth preset temperature can be determined according to the actual situation, and the third preset time and the fourth preset time can be determined according to the actual situation.

[0097] Specifically, judge the current defrosting mode of the air conditioner 100. When the air conditioner 100 operates in the first non-reversing defrosting mode, judge the opening degree of the electronic expansion valve 40, judge the temperature of the outdoor heat exchanger 20 and the eighth preset temperature, and judge the operation time of the first non-reversing defrosting mode. When the controller 80 does not detect a change in the opening degree of the electronic expansion valve 40 and the temperature of the outdoor heat exchanger 20 is greater than the eighth preset temperature, it indicates that the defrosting of the outdoor heat exchanger 20 is completed, and the air conditioner 100 can be controlled to exit the first non-reversing defrosting mode. Or, when the controller 80 does not detect a change in the opening degree of the electronic expansion valve 40 and the operation time of the first non-reversing defrosting mode is greater than the third preset time, it indicates that the defrosting of the outdoor heat exchanger 20 is completed, and the air conditioner 100 is controlled to exit the first non-reversing defrosting mode.

[0098] Judge the current defrosting mode of the air conditioner 100. When the air conditioner 100 operates in the first non-reversing defrosting mode, judge the opening degree of the electronic expansion valve 40. When the opening degree of the electronic expansion valve 40 changes, it indicates that the outdoor heat exchanger 20 is still being defrosted by increasing the opening degree of the electronic expansion valve 40. In order to ensure the stability of obtaining the temperature change of the outdoor heat exchanger 20, after a fourth preset time delay, for example, the fourth preset time can be 30 seconds, and then judge whether the air conditioner 100 exits the first non-reversing defrosting mode according to the temperature of the outdoor heat exchanger 20. That is, when the controller 80 does not detect a change in the opening degree of the electronic expansion valve 40, and the temperature of the outdoor heat exchanger 20 is greater than the eighth preset temperature or the operation time of the first non-reversing defrosting mode is greater than the third preset time, control the air conditioner 100 to exit the first non-reversing defrosting mode.

[0099] According to an embodiment of the present invention, the controller 80 is further configured to, when the air conditioner 100 operates in the second non-reversing defrosting mode, if the change in the opening degree of the electronic expansion valve 40 is not detected, then when the temperature of the outdoor heat exchanger 20 is greater than the ninth preset temperature or the operation time of the second non-reversing defrosting mode is greater than the fifth preset time, control the air conditioner 100 to exit the second non-reversing defrosting mode; if the change in the opening degree of the electronic expansion valve 40 is detected, then after a sixth preset time delay, judge whether the air conditioner 100 exits the second non-reversing defrosting mode according to the temperature of the outdoor heat exchanger 20; wherein, the ninth preset temperature is greater than the eighth preset temperature, and the fifth preset time is greater than the third preset time. Among them, the ninth preset temperature can be determined according to the time situation, and the fifth preset time and the sixth preset time can be determined according to the actual situation.

[0100] Specifically, judge the current defrosting mode of the air conditioner 100. When the air conditioner 100 operates in the second non-reversing defrosting mode, judge the opening degree of the electronic expansion valve 40, judge the temperature of the outdoor heat exchanger 20 and the ninth preset temperature, and judge the operation time of the second non-reversing defrosting mode. When the controller 80 does not detect a change in the opening degree of the electronic expansion valve 40, and the temperature of the outdoor heat exchanger 20 is greater than the ninth preset temperature, where the ninth preset temperature is greater than the eighth preset temperature, it indicates that the defrosting of the outdoor heat exchanger 20 has been completed, and the air conditioner 100 can be controlled to exit the second non-reversing defrosting mode. Or, when the controller 80 does not detect a change in the opening degree of the electronic expansion valve 40, and the operation time of the second non-reversing defrosting mode is greater than the fifth preset time, it indicates that the defrosting of the outdoor heat exchanger 20 has been completed, and the air conditioner 100 is controlled to exit the second non-reversing defrosting mode.

[0101] Judge the current defrosting mode of the air conditioner 100. When the air conditioner 100 operates in the second non-reversing defrosting mode, judge the opening degree of the electronic expansion valve 40. When the opening degree of the electronic expansion valve 40 changes, it indicates that the outdoor heat exchanger 20 is still being defrosted by increasing the opening degree of the electronic expansion valve 40. In order to ensure the stability of obtaining the temperature change of the outdoor heat exchanger 20, after a sixth preset time delay, for example, the sixth preset time can be 40 seconds, and then judge whether the air conditioner 100 exits the second non-reversing defrosting mode according to the temperature of the outdoor heat exchanger 20. That is, when the controller 80 does not detect a change in the opening degree of the electronic expansion valve 40, and the temperature value of the outdoor heat exchanger 20 is greater than the ninth preset temperature or the operation time of the second non-reversing defrosting mode is greater than the fifth preset time, control the air conditioner 100 to exit the first non-reversing defrosting mode.

[0102] According to an embodiment of the present invention, the controller 80 is further configured to determine the ninth preset temperature according to the change trend of the outdoor ambient temperature and the current outdoor ambient temperature.

[0103] Specifically, since the defrosting time of the air conditioner 100 in the first non-reversing defrosting mode is short, and the defrosting time in the second non-reversing defrosting mode is long, therefore, the ninth preset temperature can also be jointly determined according to the change trend of the outdoor ambient temperature and the current outdoor ambient temperature. For example, when the air conditioner 100 defrosts in the second non-reversing defrosting mode, obtain the change trend of the outdoor ambient temperature and the current outdoor ambient temperature. For example, when the outdoor ambient temperature is rising, when the outdoor ambient temperature is less than or equal to 〖1〗^∘ C, the ninth preset temperature can be determined to be 〖14〗^∘ C. That is to say, when the temperature of the outdoor heat exchanger 20 exceeds 〖14〗^∘ C, the current defrosting mode can be exited and the normal heating of the air conditioner 100 can be restored; when the outdoor ambient temperature is greater than 〖1〗^∘ C, the ninth preset temperature can be determined to be 〖18〗^∘ C. That is to say, when the temperature of the outdoor heat exchanger 20 exceeds 〖18〗^∘ C, the current defrosting mode can be exited and the normal heating of the air conditioner 100 can be restored.

[0104] Obtain the change trend of the outdoor ambient temperature and the current outdoor ambient temperature. For example, when the outdoor ambient temperature is falling, when the outdoor ambient temperature is less than or equal to - 〖1〗^∘ C, the ninth preset temperature can be determined to be 〖14〗^∘ C. That is to say, when the temperature of the outdoor heat exchanger 20 exceeds 〖14〗^∘ C, the current defrosting mode can be exited and the normal heating of the air conditioner 100 can be restored; when the outdoor ambient temperature is greater than - 〖1〗^∘ C, the ninth preset temperature can be determined to be 〖18〗^∘ C. That is to say, when the temperature of the outdoor heat exchanger 20 exceeds 〖18〗^∘ C, the current defrosting mode can be exited and the normal heating of the air conditioner 100 can be restored.

[0105] Thus, more reasonable judgment conditions for the temperature when defrosting exits can be ensured, balancing the defrosting cleanliness and user experience.

[0106] According to an embodiment of the present invention, the controller 80 is further configured to, when the air conditioner 100 enters the first non-reversing defrosting mode, control the compressor 70 to operate at a first operating frequency, stop the outdoor fan, and keep the rotational speed of the indoor fan unchanged; when the air conditioner 100 enters the second non-reversing defrosting mode, control the compressor 70 to operate at a second operating frequency, stop the outdoor fan, and reduce the rotational speed of the indoor fan at a preset rate; wherein, the first operating frequency is less than the second operating frequency. The first operating frequency and the second operating frequency can be determined according to the actual situation.

[0107] Specifically, when it is determined that the air conditioner 100 enters the first non-reversing defrosting mode, the controller 80 can control the compressor 70 not to stop and operate at the first operating frequency, and control the outdoor fan to stop. If the outdoor fan continues to operate, it may cause more air to pass through the outdoor heat exchanger 20, resulting in more serious frosting, and control the rotational speed of the indoor fan to remain unchanged, so as to quickly defrost while ensuring that the indoor temperature does not decrease.

[0108] When it is determined that the air conditioner 100 enters the second non-reversing defrosting mode, the compressor 70 can be controlled not to stop and operate at the second operating frequency, wherein the second operating frequency is greater than the first operating frequency, and control the outdoor fan to stop. If the outdoor fan continues to operate, it may cause more air to pass through the outdoor heat exchanger 20, resulting in more serious frosting, and control the rotational speed of the indoor fan to decrease at a preset rate to prevent the temperature entering the outdoor heat exchanger 20 from being too low, resulting in more serious frosting.

[0109] According to an embodiment of the present invention, the electronic expansion valve 80 is a wide-range variable-gain electronic expansion valve. Compared with the traditional electronic expansion valve, it can increase the upper limit flow rate on the basis of maintaining the lower limit flow rate, that is, in the non-reversing defrosting mode of the air conditioner 100, a larger refrigerant flow rate can be passed, so that the air conditioner 100 can be defrosted better.

[0110] According to an embodiment of the present invention, the wide-range variable-gain electronic expansion valve is further configured to change the opening degree based on the load change when the air conditioner 100 is in the heating operation.

[0111] Specifically, when the air conditioner 100 is operating in the heating mode, the wide-range variable-gain electronic expansion valve can change its opening degree based on the load change. For example, the wide-range variable-gain electronic expansion valve can be configured with corresponding sensors for monitoring the parameters of the air-conditioning system, such as temperature, pressure, etc. After obtaining the parameters, the data can be sent to the controller 80. The controller 80 can decide whether to adjust the wide-range variable-gain electronic expansion valve by comparing the difference between the current system load and the target load. If the system load increases, the controller 80 can control the opening degree of the wide-range variable-gain electronic expansion valve to increase to provide more refrigerant flow; conversely, if the system load decreases, the controller can control the opening degree of the wide-range variable-gain electronic expansion valve to decrease. Thus, the energy efficiency of the air conditioner 100 during heating can be improved, the energy consumption can be reduced, and the performance stability of the system under different working conditions can be ensured.

[0112] According to an embodiment of the present invention, as Figure 5 shown, the wide-range variable-gain electronic expansion valve includes a valve body 41. An inlet and an outlet are provided on the valve body 41. A valve seat 42 is provided at the outlet. A valve needle 43 is provided on the valve seat 42. The gap between the valve needle 43 and the valve seat 42 forms a throttle orifice, and the adjustment section of the valve needle 43 is designed at multiple angles. Among them, the diameter range of the valve seat 42 is 1.6 mm - 3.2 mm.

[0113] Specifically, by providing a throttle orifice 44 on the valve seat 42 that connects the inner cavity of the valve body 41 to the outlet pipe, the refrigerant in the pipeline flows through the throttle orifice 44. And the valve stem 45 is connected to the valve needle 43. By controlling the movement of the valve stem 45, the size of the throttle orifice 44 can be adjusted. For example, when the valve stem 45 moves upward, the size of the throttle orifice 44 can be increased. When the valve stem 45 moves downward, the size of the throttle orifice 44 can be decreased. Thus, the flow rate of the refrigerant in the pipeline can be controlled. Among them, the valve body 41 can be made of brass.

[0114] As Figure 6As shown, the valve needle 43 can be trapezoidal. By setting the valve needle 43 to be trapezoidal and increasing the caliber value range of the valve seat 42, that is, by increasing the width of the valve seat of the wide-width variable-gain electronic expansion valve, compared with the traditional electronic expansion valve, on the basis of maintaining the lower limit refrigerant flow rate, the upper limit of the refrigerant flow rate in the pipeline is increased. That is, more refrigerant flow rate can be passed, so that when the air conditioner 100 defrosts, reverse defrosting does not need to be carried out. That is, a larger refrigerant flow rate can change the heat exchange effect between the outdoor heat exchanger 20 and the frost layer, which helps to ensure that enough heat is transferred to the ice layer during the defrosting process for more effective melting. And the design of the trapezoidal valve needle 43 can improve the accuracy of flow regulation. Compared with other shapes, the trapezoidal shape can regulate the refrigerant flow rate more carefully and can respond more flexibly to the adjustment signal of electronic control, improving the response speed. At the same time, the valve needle 43 can also be adjusted at multiple angles (within the range of α) to adjust the refrigerant flow rate in the pipeline. Among them, the caliber value range of the valve seat 42 can be 1.6 mm - 3.2 mm.

[0115] In addition, the valve needle 43 can be set to be conical, which helps to reduce the pressure difference when the electronic expansion valve 40 starts, can reduce the starting power consumption, improve the efficiency, and designing the caliber of the valve seat 42 to be smaller can be more lightweight, reducing the load of the entire electronic expansion valve 40. And in an air conditioner system with limited space, the small valve seat design can effectively save space, and the volume of the refrigerant flow is small, which helps to reduce the internal volume of the system, reduce energy consumption and the use of refrigerant.

[0116] According to an embodiment of the present invention, as Figure 7 shown, the variable flow throttle valve 30 includes: a housing 81, an installation channel 82 is formed in the housing 81, the housing 81 has a first medium flow port 83 and a second medium flow port 84, and the installation channel 82 communicates the first medium flow port 83 and the second medium flow port 84; a first valve seat 85, the first valve seat 85 is installed in the installation channel 82, the first valve seat 85 is formed with an adjacent first hole 86 and a first medium flow channel 87, the first medium flow channel 87 communicates the first medium flow port 83 and the first hole 86, and the first hole 86 is adapted to communicate the first medium flow channel 87 and the second medium flow port 84; the first valve seat 85 is also formed with an adjacent second hole 88 and a second medium flow channel 89, the second medium flow channel 89 communicates the second medium flow port 84 and the second hole 88, and the second hole 88 is adapted to communicate the first medium flow port 83 and the second medium flow channel 89; a first valve core 90 (not shown in the figure), the first valve core 90 is arranged in the first medium flow channel 87, and the first valve core 90 can move along the first medium flow channel 87 to open or close the first hole 86; a second valve core 91 (not shown in the figure), the second valve core 91 is arranged in the second medium flow channel 89, and the second valve core 91 can move along the second medium flow channel 89 to open or close the second hole 88.

[0117] Specifically, the variable flow throttle valve 30 may include a housing 81, and the material of the housing 81 may be stainless steel, that is, it has the characteristics of corrosion resistance, high temperature resistance, and high strength, which can ensure the stability and reliability of the air conditioning system. The housing 81 has a first medium flow port 83 and a second medium flow port 84. When the air conditioner 100 operates in different modes, the flow direction of the medium inside the variable flow throttle valve 30 is different. For example, Figure 7 As shown, when the air conditioner 100 operates in the cooling mode, the medium can flow from the first medium flow port 83 to the second medium flow port 84 (i.e., the direction from the F end to the C end), and when the air conditioner 100 operates in the heating mode, the medium can flow from the second medium flow port 84 to the first medium flow port 83 (i.e., the direction from the C end to the F end). Among them, an installation channel 82 is formed in the housing 81, and the first medium flow port 83 is connected to the second medium flow port 84 through the installation channel 82.

[0118] The variable flow throttle valve 30 further includes a first valve seat 85. The first valve seat 85 is formed with an adjacent first hole 86 and a first medium flow channel 87. Setting the first valve core 90 in the first medium flow channel 87 can enable the first valve core 90 to move along the first medium flow channel 87 to open or close the first hole 86. For example, when the first valve core 90 moves upward, the first hole 86 can be gradually opened to allow the flow of the medium, and when the first valve core 90 moves downward, the first hole 86 can be gradually closed to restrict the flow of the medium. When the first hole 86 is opened, the medium can flow from the second medium flow port 84 to the first hole 86, and then to the first medium flow channel 87, and finally can flow out through the first medium flow port 83.

[0119] The first valve seat 85 may also be formed with an adjacent second hole 88 and a second medium flow channel 89. Setting the second valve core 91 in the second medium flow channel 89 can enable the second valve core 91 to move along the second medium flow channel 89 to open or close the second hole 88. For example, when the second valve core 91 moves downward, the second hole 88 can be gradually opened to allow the medium to pass through, and when the second valve core 91 moves upward, the second hole 82 can be gradually closed to restrict the flow of the medium. When the second hole 88 is opened, the medium can flow from the first medium flow port 83 to the second hole 82, and then to the second medium flow channel 89, and finally can flow out through the second medium flow port 84.

[0120] According to an embodiment of the present invention, as Figure 7As shown, when the medium flows into the installation channel 82 through the first medium flow port 83, the medium drives the first valve core 90 to move to close the first hole 86 and drives the second valve core 91 to move to open the second hole 88; when the medium flows into the installation channel 82 through the second medium flow port 89, the medium drives the first valve core 90 to move to open the first hole 86 and drives the second valve core 91 to move to close the second hole 88; wherein, along the length direction of the installation channel 82, the first hole 86 and the second hole 88 are located between the first medium flow channel 87 and the second medium flow channel 89.

[0121] Specifically, when the air conditioner 100 operates in the cooling mode, the medium can flow into the installation channel 82 through the first medium flow port 83, and when the medium flows into the installation channel 82 through the first medium flow port 83, according to the pressure of the flowing-in medium, the first valve core 90 can be driven to move and close the first hole 86, and the second valve core 91 can be driven to move and open the second hole 88, and the medium will not flow out from the first hole 86, but flow out from the second hole 88. When the air conditioner 100 operates in the heating mode, the medium can flow into the installation channel 82 through the second medium flow port 89. When the medium flows into the installation channel 82 through the second medium flow port 89, according to the pressure of the flowing-in medium, the first valve core 90 can be driven to move and open the first hole 86, and the second valve core 91 can be driven to move and close the second hole 88, and the medium will not flow out from the second hole 88, but flow out from the first hole 86. Wherein, when the first hole 86 is open, the medium can flow through the first hole 86 to the first medium flow channel 87, and when the second hole 88 is open, the medium can flow through the second hole 88 to the second medium flow channel 89.

[0122] According to an embodiment of the present invention, as Figure 7 shown, a throttling channel 92 and a conducting channel 93 are further formed in the housing 81. The throttling channel 92 communicates with the first medium flow port 83 and the second hole 88, and the conducting channel 93 communicates with the second medium flow port 84 and the first hole 86, wherein the throttling channel 92 and / or the conducting channel 93 are formed in the first valve seat 85.

[0123] Specifically, the variable flow throttle valve 30 can have a throttling function and a conducting function, and can automatically determine whether to throttle or conduct the medium according to different current operating modes of the air conditioner 100. That is, a throttling channel 92 and a conducting channel 93 are also formed inside the housing 81 of the variable flow throttle valve 30. When the air conditioner 100 operates in the cooling mode, the medium can flow from the first medium flow port 83 to the throttling channel 92 and then to the second hole 88. When the air conditioner 100 operates in the heating mode, the medium can flow from the second medium flow port 84 to the conducting channel 93 and then to the first hole 86. Thus, the variable flow throttle valve 30 can achieve different functions according to different channels. Among them, the throttling channel 92 is formed in the first valve seat 85, or the conducting channel 93 is formed in the first valve seat 85, or the throttling channel 92 and the conducting channel 93 are formed in the first valve seat 85, so that the medium can flow to the first valve seat 85 from different directions.

[0124] According to an embodiment of the present invention, as Figure 7 shown, a first communication flow channel 94 is formed between the first valve seat 85 and the housing 81, and the first communication flow channel 94 connects the throttling channel 92 and the first medium flow port 83; a second communication flow channel 95 is formed between the first valve seat 85 and the housing 81, and the second communication flow channel 95 connects the conducting channel 93 and the second medium flow port 84.

[0125] Specifically, when the air conditioner 100 operates in the cooling mode, the variable flow throttle valve 30 can adjust the flow rate of the medium. That is, when the medium flows into the installation channel 82 through the first medium flow port 83, it drives the first valve core 90 to move to close the first hole 86 and drives the second valve core 91 to move to open the second hole 88. When the first hole 86 is in a closed state and the second hole 88 is in an open state, the medium can flow from the first medium flow port 83 to the first communication flow channel 94, pass through the throttling channel 92, then flow to the second hole 88, and finally flow out through the second medium flow port 84 to achieve throttling of the flow rate of the medium.

[0126] When the air conditioner 100 operates in the heating mode, the variable flow throttle valve 30 does not adjust the flow rate of the medium. That is, when the medium flows into the installation channel 82 through the second medium flow port 84, the medium drives the first valve core 90 to move to open the first hole 86 and drives the second valve core 91 to move to close the second hole 88. When the first hole 86 is in an open state and the second hole 88 is in a closed state, the medium can flow from the second medium flow port 84 to the second communication flow channel 95, pass through the conducting channel 93, then flow to the first hole 88, and finally flow out through the first medium flow port 83. At this time, no throttling is performed to ensure the heating effect of the air conditioner. Among them, the medium can be refrigerant.

[0127] According to an embodiment of the present invention, as Figure 7As shown, a first limiting member 96 (not shown in the figure) is provided in the first medium flow channel 87. The first limiting member 96 is located on the side of the first valve core 90 away from the first hole 86. The first limiting member 96 is formed with a third communication flow channel 97 that communicates the first medium flow channel 87 and the first medium flow port 83. The first limiting member 96 is adapted to be in limiting cooperation with the first valve core 90; a second limiting member 98 (not shown in the figure) is provided in the second medium flow channel 89. The second limiting member 98 is located on the side of the second valve core 91 away from the second hole 88. The second limiting member 98 is formed with a fourth communication flow channel 99 that communicates the second medium flow channel 89 and the second medium flow port 84. The second limiting member 98 is adapted to be in limiting cooperation with the second valve core 91.

[0128] Specifically, by providing a first limiting member 96 in the first medium flow channel 87 and being adapted to be in limiting cooperation with the first valve core 90, and providing a second limiting member 98 in the second medium flow channel 89 and being adapted to be in limiting cooperation with the second valve core 91, that is, through the cooperation of the limiting members, the movement range of the valve core is restricted within the designed parameter range, thereby preventing the valve core from being overly opened or closed and ensuring that the system operates within a safe and stable range. In addition, the correct cooperation between the limiting member and the valve core helps to achieve precise control of the medium flow rate. By ensuring that the valve core stops or is limited at a predetermined position, the required flow rate level can be maintained without exceeding the designed range.

[0129] The first limiting member 96 is formed with a third communication flow channel 97 that communicates the first medium flow channel 87 and the first medium flow port 83. The second limiting member 98 is formed with a fourth communication flow channel 99 that communicates the second medium flow channel 89 and the second medium flow port 84. Thus, when the medium flows in from the first medium flow port 83, it can flow from the first medium flow port 83 to the first communication flow channel 94, and after passing through the throttling channel 92, it flows to the second hole 88, then flows from the second hole 88 to the second medium flow channel 89, and flows through the second medium flow channel 89 to the fourth communication flow channel 99, and finally flows to the second medium flow port 84 and flows out from the second medium flow port 84. When the medium flows in from the second medium flow port 84, it can flow from the second medium flow port 84 to the second communication flow channel 95, and after passing through the conducting channel 93, it flows to the first hole 86, then flows from the first hole 86 to the first medium flow channel 87, and flows through the first medium flow channel 87 to the third communication flow channel 97, and finally flows to the first medium flow port 83 and flows out from the first medium flow port 83.

[0130] According to an embodiment of the present invention, as Figure 7 shown, the variable flow throttle valve 30 may further include: an elastic member 101. The elastic member 101 is assembled in the second medium flow channel 89 and is located between the second valve core 91 and the second limiting member 98. The elastic member 101 is connected between the second valve core 91 and the second limiting member 98.

[0131] According to an embodiment of the present invention, as Figure 7 shown, the second valve core 91 includes a valve core main body 102 (not shown in the figure) and a closing column 103 (not shown in the figure) connected to each other, and the closing column 103 is used to open or close the second hole 88.

[0132] Specifically, the variable flow throttle valve 30 may further include an elastic member 101. The elastic member 101 has a certain stroke, which can help limit the movement range of the second valve core 91 and ensure that the second valve core 91 adjusts the flow rate within a suitable range. The second valve core 91 may include a valve core main body 102 and a closing column 103 connected to each other. The position of the valve core main body 102 determines the size of the medium passing through the fourth communication flow channel 99. When the air conditioner 100 operates in the cooling mode, the medium can flow in from the first medium flow port 83, flow from the first medium flow port 83 to the first communication flow channel 94, and then flow to the second hole 88 after passing through the throttle channel 92. At this time, the closing column 103 can open the second hole 88, and then flow from the second hole 88 to the second medium flow channel 89. When the pressure of the medium (such as refrigerant) is low, the deformation amount of the elastic member 101 is small, which can cause a small change in the position of the second valve core 91 and a small flow rate flowing into the fourth communication flow channel 99, that is, a small flow rate of refrigerant flows out from the second medium flow port 84 to ensure the throttling effect and the reliability such as the oil return of the compressor 70. When the refrigerant pressure is high, the deformation amount of the elastic member 101 is large, which can cause a large change in the position of the second valve core 91 and a large flow rate flowing into the fourth communication flow channel 99, that is, a large flow rate of refrigerant flows out from the second medium flow port 84 to improve the cooling effect of the air conditioner 100. Among them, the elastic member 101 can be a spring.

[0133] According to an embodiment of the present invention, as Figure 7 shown, the valve core main body 102 is configured as a cylinder, or at least one notch is formed on the side wall of the valve core main body 102.

[0134] Specifically, designing the valve core main body 102 as a cylinder is on the one hand that the cylinder is easy to manufacture and maintain, and on the other hand, the cylindrical valve core main body 102 has a uniform geometric shape, which helps to achieve a relatively uniform fluid distribution and can avoid uneven flow velocities generated when the medium passes through the variable flow throttle valve 30, thereby improving the stability of the air conditioning system. Or at least one notch is formed on the side wall of the valve core main body 102. For example, there can be two notches, so that during the movement of the valve core main body 102, the vibration during movement can be reduced and the stability of the system can be improved. And the setting of the notch can affect the eddy current and turbulence generated when the medium passes through the valve core main body 102. By adjusting the shape of the notch, these unstable fluid phenomena can be reduced to further improve the efficiency of the system.

[0135] According to an embodiment of the present invention, as Figure 7As shown in the figure, the variable flow throttle valve 30 may further include: a first filter element 103, which is installed in the installation channel 82 and located between the first valve seat 85 and the first medium flow port 83; a second filter element 104, which is installed in the installation channel 82 and located between the first valve seat 85 and the second medium flow port 84.

[0136] Specifically, by arranging the first filter element 103 between the first valve seat 85 and the first medium flow port 83, and arranging the second filter element 104 between the first valve seat 85 and the second medium flow port 84, solid particles, impurities, sediment, etc. in the medium can be blocked to prevent them from entering the interior of the variable flow throttle valve 30, thereby extending the service life of the variable flow throttle valve 30, reducing the maintenance frequency, and improving the reliability of the system. In addition, if the medium contains condensable substances or precipitates, they may accumulate inside or in the pipeline when flowing through the variable flow throttle valve 30, resulting in blockage of the variable flow throttle valve 30. The arrangement of the first filter element 103 and the second filter element 104 can reduce the risk of blockage and ensure smooth fluid passage through the throttle valve. Among them, the first filter element and the second filter element can be filter meshes.

[0137] In summary, for the air conditioner according to the embodiment of the present invention, the variable flow throttle valve is configured to automatically adjust the refrigerant flow rate to adapt to load changes during the refrigeration operation of the air conditioner, and the electronic expansion valve is configured to perform an opening increase adjustment during the non-reversing defrosting operation of the air conditioner, and the opening changes in a stepwise manner. Thus, the air conditioner can achieve non-reversing defrosting at low cost, reduce the risk of short-circuit burnout of the electronic control, ensure the heating effect of the air conditioner when the refrigerant flow rate is low, ensure the throttling effect when the air conditioner is at low load, ensure the reliability of the compressor oil return, and ensure sufficient flow rate when the air conditioner is at high load to ensure the refrigeration effect of the air conditioner.

[0138] Corresponding to the above embodiments, the present invention also proposes a control method for an air conditioner. As Figure 1 shown, the air conditioner 100 may include a compressor 70, a reversing device 60, an outdoor heat exchanger 20, an electronic expansion valve 40, a refrigerant loop 50, a variable flow throttle valve 30, and an indoor heat exchanger 10 that are connected in sequence. As Figure 8 shown, the control method for the air conditioner according to the embodiment of the present invention includes the following steps:

[0139] S1, determining the operating condition of the air conditioner;

[0140] S2, during the refrigeration operation of the air conditioner, automatically adjusting the refrigerant flow rate based on the variable flow throttle valve to adapt to load changes.

[0141] S3. When the air conditioner operates in non-reversing defrosting mode, the opening of the electronic expansion valve is adjusted to increase, and the opening changes in a stepwise manner.

[0142] According to an embodiment of the present invention, determining the lower limit opening of the electronic expansion valve based on the outdoor ambient temperature includes: when the outdoor ambient temperature is less than or equal to the first preset outdoor temperature, setting the first opening value as the lower limit opening; when the outdoor ambient temperature is greater than the first preset outdoor temperature and less than or equal to the second preset outdoor temperature, determining the lower limit opening according to a preset linear relationship; when the outdoor ambient temperature is greater than the second preset outdoor temperature, setting the second opening value as the lower limit opening; wherein, the preset linear relationship is a linear function with the outdoor ambient temperature as a variable, the first opening value is less than the minimum value of the preset linear relationship, and the maximum value of the preset linear relationship is less than the second opening value.

[0143] According to an embodiment of the present invention, adjusting the opening of the electronic expansion valve to increase and the opening changing in a stepwise manner includes: obtaining the current opening of the electronic expansion valve, and performing multiple increases in the opening of the electronic expansion valve according to the current opening, so that the opening of the electronic expansion valve changes in a stepwise manner.

[0144] According to an embodiment of the present invention, performing multiple increases in the opening of the electronic expansion valve according to the current opening includes: determining the target opening and the number of opening adjustments of the electronic expansion valve, determining the adjustment step according to the current opening, the target opening and the number of opening adjustments, and performing multiple increases in the opening of the electronic expansion valve according to the adjustment step.

[0145] According to an embodiment of the present invention, the control method of the air conditioner further includes: obtaining at least one of the indoor ambient temperature, the outdoor ambient temperature and the outdoor heat exchanger temperature, and determining the non-reversing defrosting operation of the air conditioner according to at least one of the indoor ambient temperature, the outdoor ambient temperature and the outdoor heat exchanger temperature.

[0146] According to an embodiment of the present invention, when it is determined that none of the following conditions are satisfied, controlling the air conditioner to operate in non-reversing defrosting mode: (1) the indoor ambient temperature is less than the first preset temperature, or the outdoor ambient temperature is less than the second preset temperature, or the sum of the indoor ambient temperature and the outdoor ambient temperature is less than the third preset temperature; (2) the change value of the outdoor heat exchanger temperature is less than the fourth preset temperature; (3) the outdoor ambient temperature is less than the fifth preset temperature and the air conditioner has not entered the defrosting mode within the second preset time, wherein the fifth preset temperature is greater than the second preset temperature.

[0147] According to an embodiment of the present invention, the control method of the air conditioner further includes: obtaining a first temperature change value of the outdoor heat exchanger and a second temperature change value of the outdoor ambient temperature within a third preset time; determining a change value of the temperature of the outdoor heat exchanger according to the relationship between the first temperature change value and the second temperature change value.

[0148] According to an embodiment of the present invention, the control method of the air conditioner further includes: when the change value of the temperature of the outdoor heat exchanger is less than a sixth preset temperature, controlling the air conditioner to enter a first non-reversing defrost mode; when the change value of the temperature of the outdoor heat exchanger is less than a seventh preset temperature, controlling the air conditioner to enter a second non-reversing defrost mode; wherein, the seventh preset temperature is less than the sixth preset temperature, and the sixth preset temperature is greater than the fourth preset temperature.

[0149] According to an embodiment of the present invention, when the air conditioner operates in the first non-reversing defrost mode, the method further includes: if it is not detected that the opening degree of the electronic expansion valve changes, then when the temperature of the outdoor heat exchanger is greater than an eighth preset temperature or the operation time of the first non-reversing defrost mode is greater than a third preset time, controlling the air conditioner to exit the first non-reversing defrost mode; if it is detected that the opening degree of the electronic expansion valve changes, then after delaying for a fourth preset time, determining whether the air conditioner exits the first non-reversing defrost mode according to the temperature of the outdoor heat exchanger.

[0150] According to an embodiment of the present invention, when the air conditioner operates in the second non-reversing defrost mode, the method further includes: if it is not detected that the opening degree of the electronic expansion valve changes, then when the temperature of the outdoor heat exchanger is greater than a ninth preset temperature or the operation time of the second non-reversing defrost mode is greater than a fifth preset time, controlling the air conditioner to exit the second non-reversing defrost mode; if it is detected that the opening degree of the electronic expansion valve changes, then after delaying for a sixth preset time, determining whether the air conditioner exits the second non-reversing defrost mode according to the temperature of the outdoor heat exchanger; wherein, the ninth preset temperature is greater than the eighth preset temperature, and the fifth preset time is greater than the third preset time.

[0151] According to an embodiment of the present invention, the control method of the air conditioner further includes: when the air conditioner enters the first non-reversing defrost mode, controlling the compressor to operate at a first operating frequency, stopping the outdoor fan, and keeping the rotational speed of the indoor fan unchanged; when the air conditioner enters the second non-reversing defrost mode, controlling the compressor to operate at a second operating frequency, stopping the outdoor fan, and reducing the rotational speed of the indoor fan at a preset rate; wherein, the first operating frequency is less than the second operating frequency.

[0152] The following combines Figure 9 to describe the control method of the present invention.

[0153] As a specific example, the control method of the air conditioner of the present invention may include the following steps:

[0154] S101, Determine the operating conditions of the air conditioner.

[0155] S102, Determine whether the air conditioner is operating in the cooling mode. If yes, execute step S103; if no, execute step S109.

[0156] S103, Determine whether the outdoor ambient temperature is less than or equal to the first preset outdoor temperature. If yes, execute step S104; if no, execute step S105.

[0157] S104, Set the first opening value as the lower limit opening of the electronic expansion valve.

[0158] S105, Determine whether the outdoor ambient temperature is greater than the first preset outdoor temperature and less than or equal to the second preset temperature. If yes, execute step S106; if no, execute step S107.

[0159] S106, Determine the lower limit opening of the electronic expansion valve according to the preset linear relationship.

[0160] S107, Determine whether the outdoor ambient temperature is greater than the second preset temperature. If yes, execute step S108; if no, execute step S101.

[0161] S108, Set the second opening value as the lower limit opening of the electronic expansion valve.

[0162] S109, Determine whether all preset conditions are not met. If yes, execute step S110; if no, execute step S115.

[0163] S110, Determine whether the change value of the outdoor heat exchanger temperature is less than the sixth preset temperature. If yes, execute step S111; if no, execute step S116.

[0164] S111, Control the air conditioner to enter the first non-reversing defrost mode and control the compressor to operate at the first operating frequency, stop the outdoor fan, and keep the speed of the indoor fan unchanged.

[0165] S112, Determine whether the opening of the electronic expansion valve has changed. If yes, execute step S113; if no, execute step S114.

[0166] S113, When the temperature value of the outdoor heat exchanger is greater than the eighth preset temperature or the operating time of the first non-reversing defrost mode is greater than the third preset time, control the air conditioner to exit the first non-reversing defrost mode.

[0167] S114, After delaying the fourth preset time, determine whether to exit the first non-reversing defrost mode according to the outdoor heat exchanger temperature.

[0168] S115, control the four-way valve to commutate so that the air conditioner enters the commutation defrosting mode.

[0169] S116, determine whether the change value of the outdoor heat exchanger temperature is less than the seventh preset temperature. If yes, execute step S117; if no, execute step S109.

[0170] S117, control the air conditioner to enter the second non-commutation defrosting mode and control the compressor to operate at the second operating frequency, stop the outdoor fan, and reduce the rotational speed of the indoor fan at a preset rate.

[0171] S118, determine whether the opening of the electronic expansion valve has changed. If yes, execute step S119; if no, execute step S120.

[0172] S119, when the temperature value of the outdoor heat exchanger is greater than the ninth preset temperature or the operating time of the second non-commutation defrosting mode is greater than the fifth preset time, control the air conditioner to exit the second non-commutation defrosting mode.

[0173] S120, after delaying the sixth preset time, determine whether to exit the second non-commutation defrosting mode according to the outdoor heat exchanger temperature.

[0174] It should be noted that for the details not disclosed in the control method of the air conditioner in the embodiments of the present invention, please refer to the details disclosed in the air conditioner in the embodiments of the present invention, and will not be elaborated here specifically.

[0175] According to the control method of the air conditioner in the embodiments of the present invention, determine the operating conditions of the air conditioner. When the air conditioner is operating in the cooling mode, automatically adjust the refrigerant flow based on the variable flow throttle valve to adapt to the load change. When the air conditioner is operating in the non-commutation defrosting mode, adjust the opening of the electronic expansion valve to become larger, and the opening changes in a stepwise manner. Thus, this method can achieve non-commutation defrosting at low cost and reduce the risk of short circuit and burnout of the electronic control. It can ensure the heating effect of the air conditioner when the refrigerant flow is low, ensure the throttling effect when the air conditioner is at low load, ensure the reliability of the compressor oil return, and ensure sufficient flow when the air conditioner is at high load to ensure the cooling effect of the air conditioner.

[0176] Corresponding to the above embodiments, the present invention also proposes a computer-readable storage medium.

[0177] The computer-readable storage medium of the embodiments of the present invention stores a computer program, and when the computer program is executed by a processor, it implements the above control method of the air conditioner.

[0178] According to the computer-readable storage medium of the embodiments of the present invention, by executing the above control method of the air conditioner, it is possible to achieve defrosting without reversing at low cost, reduce the risk of short-circuit burnout of the electronic control, ensure the heating effect of the air conditioner when the refrigerant flow rate is low, ensure the throttling effect when the air conditioner is at low load, guarantee the reliability of the compressor oil return, ensure sufficient flow when the air conditioner is at high load, and ensure the refrigeration effect of the air conditioner.

[0179] It should be noted that the logic and / or steps represented in the flowchart or described in other ways herein, for example, can be considered as a definite sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device), or in combination with these instruction execution systems, apparatus, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection portion (electronic device) having one or more wirings, a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpretation, or otherwise processing as appropriate, and then stored in a computer memory.

[0180] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0181] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0182] In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0183] In the present invention, unless otherwise clearly specified and defined, the terms such as "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0184] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. An air conditioner, characterized in that, Comprising: A compressor, a reversing device, an outdoor heat exchanger, an electronic expansion valve, a refrigerant loop, a variable flow throttle valve, and an indoor heat exchanger connected in sequence, wherein The variable flow throttle valve is configured to automatically adjust the refrigerant flow rate during the refrigeration operation of the air conditioner to adapt to load changes; The electronic expansion valve is configured to increase the opening degree during the non-reversing defrost operation of the air conditioner, and the opening degree changes in a stepwise manner.

2. The air conditioner according to claim 1, wherein, Further comprising: A controller, which is configured to determine the lower limit opening degree of the electronic expansion valve according to the outdoor ambient temperature during the refrigeration operation of the air conditioner, and limit the opening degree of the electronic expansion valve according to the lower limit opening degree.

3. The air conditioner according to claim 2, characterized in that, The controller is further configured to Set the first opening degree value as the lower limit opening degree when the outdoor ambient temperature is less than or equal to the first preset outdoor temperature; Determine the lower limit opening degree according to a preset linear relationship when the outdoor ambient temperature is greater than the first preset outdoor temperature and less than or equal to the second preset outdoor temperature; Set the second opening degree value as the lower limit opening degree when the outdoor ambient temperature is greater than the second preset outdoor temperature; Wherein, the preset linear relationship is a linear function with the outdoor ambient temperature as a variable, the first opening degree value is less than the minimum value of the preset linear relationship, and the maximum value of the preset linear relationship is less than the second opening degree value.

4. The air conditioner according to claim 2, wherein The controller is further configured to, during the non-reversing defrost operation of the air conditioner, obtain the current opening degree of the electronic expansion valve, and perform multiple increases in the opening degree of the electronic expansion valve according to the current opening degree, so that the opening degree of the electronic expansion valve changes in a stepwise manner.

5. The air conditioner according to claim 4, characterized in that, The controller is further configured to determine the target opening degree and the number of opening degree adjustments of the electronic expansion valve, determine the adjustment step according to the current opening degree, the target opening degree, and the number of opening degree adjustments, and perform multiple increases in the opening degree of the electronic expansion valve according to the adjustment step.

6. The air conditioner according to claim 1, characterized in that, Further comprising: A controller, which is further configured to obtain at least one of the indoor ambient temperature, the outdoor ambient temperature, and the outdoor heat exchanger temperature, and determine the non-reversing defrost operation of the air conditioner according to at least one of the indoor ambient temperature, the outdoor ambient temperature, and the outdoor heat exchanger temperature.

7. The air conditioner according to claim 6, characterized in that, The controller controls the non-reversing defrost operation of the air conditioner when determining that none of the following conditions are met: (1) The indoor ambient temperature is less than the first preset temperature, or the outdoor ambient temperature is less than the second preset temperature, or the sum of the indoor ambient temperature and the outdoor ambient temperature is less than the third preset temperature; (2) The change value of the outdoor heat exchanger temperature is less than the fourth preset temperature; (3) The outdoor ambient temperature is less than the fifth preset temperature and the air conditioner has not entered the defrost mode within the second preset time, where the fifth preset temperature is greater than the second preset temperature.

8. The air conditioner according to claim 7, characterized in that, The controller is further configured to Obtain the first temperature change value of the outdoor heat exchanger and the second temperature change value of the outdoor ambient temperature within the third preset time; Determine the change value of the outdoor heat exchanger temperature according to the relationship between the first temperature change value and the second temperature change value.

9. The air conditioner according to claim 7, wherein The controller is further configured to, When the change value of the outdoor heat exchanger temperature is less than the sixth preset temperature, control the air conditioner to enter the first non-reversing defrosting mode; When the change value of the outdoor heat exchanger temperature is less than the seventh preset temperature, control the air conditioner to enter the second non-reversing defrosting mode; wherein, the seventh preset temperature is less than the sixth preset temperature, and the sixth preset temperature is greater than the fourth preset temperature.

10. The air conditioner according to claim 9, wherein, The controller is further configured to, when the air conditioner operates in the first non-reversing defrosting mode, wherein, If no change in the opening of the electronic expansion valve is detected, when the outdoor heat exchanger temperature is greater than the eighth preset temperature or the operation time of the first non-reversing defrosting mode is greater than the third preset time, control the air conditioner to exit the first non-reversing defrosting mode; If a change in the opening of the electronic expansion valve is detected, after a fourth preset time delay, determine whether the air conditioner exits the first non-reversing defrosting mode according to the outdoor heat exchanger temperature.

11. The air conditioner according to claim 9, characterized in that, The controller is further configured to, when the air conditioner operates in the second non-reversing defrosting mode, wherein, If no change in the opening of the electronic expansion valve is detected, when the outdoor heat exchanger temperature is greater than the ninth preset temperature or the operation time of the second non-reversing defrosting mode is greater than the fifth preset time, control the air conditioner to exit the second non-reversing defrosting mode; If a change in the opening of the electronic expansion valve is detected, after a sixth preset time delay, determine whether the air conditioner exits the second non-reversing defrosting mode according to the outdoor heat exchanger temperature; wherein, the ninth preset temperature is greater than the eighth preset temperature, and the fifth preset time is greater than the third preset time.

12. The air conditioner according to claim 9, wherein, The controller is further configured to, When the air conditioner enters the first non-reversing defrosting mode, control the compressor to operate at the first operating frequency, stop the outdoor fan, and keep the speed of the indoor fan unchanged; When the air conditioner enters the second non-reversing defrosting mode, control the compressor to operate at the second operating frequency, stop the outdoor fan, and reduce the speed of the indoor fan at a preset rate; wherein, the first operating frequency is less than the second operating frequency.

13. The air conditioner according to any one of claims 1-12, characterized in that, The electronic expansion valve is a wide-range variable gain electronic expansion valve.

14. The air conditioner according to claim 13, characterized in that, The wide-range variable gain electronic expansion valve is further configured to change the opening based on the load change when the air conditioner operates in heating mode.

15. The air conditioner according to claim 13, wherein, The wide-range variable gain electronic expansion valve includes a valve body, an inlet and an outlet are provided on the valve body, a valve seat is provided at the outlet, a valve needle is provided on the valve seat, a throttling orifice is formed by the gap between the valve needle and the valve seat, and the regulating section of the valve needle is designed at multiple angles.

16. The air conditioner according to claim 15, characterized in that, The caliber of the valve seat ranges from 1.6 mm to 3.2 mm.

17. The air conditioner according to any one of claims 1-12, characterized in that, The variable flow throttle valve includes: a housing, wherein a mounting channel is formed in the housing, the housing having a first medium flow port and a second medium flow port, the mounting channel communicating with the first medium flow port and the second medium flow port; a first valve seat, the first valve seat being mounted in the mounting passage, the first valve seat being formed with a first hole and a first medium flow channel adjacent to each other, the first medium flow channel communicating with the first medium flow port and the first hole, the first hole being adapted to communicate with the first medium flow channel and the second medium flow port; The first valve seat is further formed with an adjacent second hole and a second medium flow channel, the second medium flow channel is connected to the second medium flow port and the second hole, and the second hole is suitable for connecting the first medium flow port and the second medium flow channel; a first valve core, the first valve core being disposed in the first medium flow channel and movable along the first medium flow channel to open or close the first hole; The second valve core is disposed in the second medium flow channel, and the second valve core is movable along the second medium flow channel to open or close the second hole.

18. The air conditioner according to claim 17, characterized in that, When a medium flows into the installation channel through the first medium flow port, the medium drives the first valve core to move and close the first hole and drives the second valve core to move and open the second hole; When a medium flows into the installation channel through the second medium flow port, the medium drives the first valve core to move to open the first hole and drives the second valve core to move to close the second hole; Wherein, along the length direction of the installation channel, the first hole and the second hole are located between the first medium flow channel and the second medium flow channel.

19. The air conditioner according to claim 17, characterized in that, A throttling channel and a conducting channel are also formed in the shell, the throttling channel connects the first medium flow port and the second hole, and the conducting channel connects the second medium flow port and the first hole, wherein the throttling channel and / or the conducting channel are formed on the first valve seat.

20. The air conditioner according to claim 19, wherein, A first communication channel is formed between the first valve seat and the housing, and the first communication channel is connected with the throttling channel and the first medium flow port; A second communication flow channel is formed between the first valve seat and the housing, and the second communication flow channel is connected with the conduction channel and the second medium flow port.

21. The air conditioner according to claim 17, wherein, A first position-limiting member is provided in the first medium flow channel. The first position-limiting member is located on a side of the first valve core away from the first hole. The first position-limiting member forms a third communication flow channel connecting the first medium flow channel and the first medium flow port. The first position-limiting member is adapted to cooperate with the first valve core in limiting position. A second limiter is provided in the second medium flow channel. The second limiter is located on the side of the second valve core away from the second hole. The second limiter forms a fourth connecting flow channel connecting the second medium flow channel and the second medium flow port. The second limiter is suitable for cooperating with the second valve core in limiting position.

22. The air conditioner according to claim 21, characterized in that, The variable flow throttle valve further includes an elastic member, which is assembled in the second medium flow channel and located between the second valve core and the second limiter, and the elastic member is connected between the second valve core and the second limiter.

23. The air conditioner according to claim 17, wherein, The second valve core includes a valve core body and a closing column connected to each other, and the closing column is used to open or close the first hole.

24. The air conditioner according to claim 23, wherein The valve core body is configured as a cylinder, or at least one notch is formed on the side wall of the valve core body.

25. The air conditioner according to claim 17, wherein The variable flow throttle valve further includes: A first filter element, which is installed in the installation channel and located between the first valve seat and the first medium flow port; A second filter element, which is installed in the installation channel and located between the first valve seat and the second medium flow port.

26. A control method for an air conditioner, characterized in that, The air conditioner includes a compressor, a reversing device, an outdoor heat exchanger, an electronic expansion valve, a refrigerant loop, a variable flow throttle valve, and an indoor heat exchanger connected in sequence. The method includes: Determine the operating conditions of the air conditioner; When the air conditioner operates in refrigeration, automatically adjust the refrigerant flow rate based on the variable flow throttle valve to adapt to the load change; When the air conditioner operates in non-reversing defrosting, increase the opening degree of the electronic expansion valve, and the opening degree changes in a stepwise manner.

27. The control method according to claim 26, wherein It further includes: Determine the lower limit opening degree of the electronic expansion valve according to the outdoor ambient temperature, and limit the opening degree of the electronic expansion valve according to the lower limit opening degree.

28. The control method according to claim 27, wherein, Determining the lower limit opening degree of the electronic expansion valve according to the outdoor ambient temperature includes: When the outdoor ambient temperature is less than or equal to the first preset outdoor temperature, set the first opening degree value as the lower limit opening degree; When the outdoor ambient temperature is greater than the first preset outdoor temperature and less than or equal to the second preset outdoor temperature, determine the lower limit opening degree according to a preset linear relationship; When the outdoor ambient temperature is greater than the second preset outdoor temperature, set the second opening degree value as the lower limit opening degree; Wherein, the preset linear relationship is a linear function with the outdoor ambient temperature as a variable, the first opening degree value is less than the minimum value of the preset linear relationship, and the maximum value of the preset linear relationship is less than the second opening degree value.

29. The control method according to claim 27, wherein Increasing the opening degree of the electronic expansion valve and the opening degree changes in a stepwise manner includes: Obtain the current opening degree of the electronic expansion valve, and increase the opening degree of the electronic expansion valve multiple times according to the current opening degree, so that the opening degree of the electronic expansion valve changes in a stepwise manner.

30. The control method according to claim 29, characterized in that, Increasing the opening degree of the electronic expansion valve multiple times according to the current opening degree includes: Determine the target opening degree and the number of opening degree adjustments of the electronic expansion valve, determine the adjustment step according to the current opening degree, the target opening degree and the number of opening degree adjustments, and increase the opening degree of the electronic expansion valve multiple times according to the adjustment step.

31. The control method according to claim 26, wherein It further includes: Obtain at least one of the indoor ambient temperature, the outdoor ambient temperature, and the outdoor heat exchanger temperature, and determine the non-reversing defrosting operation of the air conditioner according to at least one of the indoor ambient temperature, the outdoor ambient temperature, and the outdoor heat exchanger temperature.

32. The control method according to claim 31, wherein When it is determined that none of the following conditions are satisfied, control the air conditioner to operate in non-reversing defrosting: (1) The indoor ambient temperature is less than a first preset temperature, or the outdoor ambient temperature is less than a second preset temperature, or the sum of the indoor ambient temperature and the outdoor ambient temperature is less than a third preset temperature; (2) The change value of the outdoor heat exchanger temperature is less than a fourth preset temperature; (3) The outdoor ambient temperature is less than a fifth preset temperature and the air conditioner has not entered the defrosting mode within a second preset time, where the fifth preset temperature is greater than the second preset temperature.

33. The control method according to claim 32, wherein It further includes: Obtaining a first temperature change value of the outdoor heat exchanger and a second temperature change value of the outdoor ambient temperature within a third preset time; Determining the change value of the outdoor heat exchanger temperature according to the relationship between the first temperature change value and the second temperature change value.

34. The control method according to claim 32, wherein, It further includes: When the change value of the outdoor heat exchanger temperature is less than a sixth preset temperature, controlling the air conditioner to enter a first non-reversing defrosting mode; When the change value of the outdoor heat exchanger temperature is less than a seventh preset temperature, controlling the air conditioner to enter a second non-reversing defrosting mode; where the seventh preset temperature is less than the sixth preset temperature, and the sixth preset temperature is greater than the fourth preset temperature.

35. The control method according to claim 34, characterized in that, When the air conditioner operates in the first non-reversing defrosting mode, the method further includes: If it is not detected that the opening degree of the electronic expansion valve changes, then when the outdoor heat exchanger temperature is greater than an eighth preset temperature or the operation time of the first non-reversing defrosting mode is greater than a third preset time, controlling the air conditioner to exit the first non-reversing defrosting mode; If it is detected that the opening degree of the electronic expansion valve changes, then after delaying for a fourth preset time, determining whether the air conditioner exits the first non-reversing defrosting mode according to the outdoor heat exchanger temperature.

36. The control method according to claim 34, wherein, When the air conditioner operates in the second non-reversing defrosting mode, the method further includes: If it is not detected that the opening degree of the electronic expansion valve changes, then when the outdoor heat exchanger temperature is greater than a ninth preset temperature or the operation time of the second non-reversing defrosting mode is greater than a fifth preset time, controlling the air conditioner to exit the second non-reversing defrosting mode; If it is detected that the opening degree of the electronic expansion valve changes, then after delaying for a sixth preset time, determining whether the air conditioner exits the second non-reversing defrosting mode according to the outdoor heat exchanger temperature; where the ninth preset temperature is greater than the eighth preset temperature, and the fifth preset time is greater than the third preset time.

37. The control method according to claim 34, characterized in that, It further includes: When the air conditioner enters the first non-reversing defrosting mode, controlling the compressor to operate at a first operating frequency, stopping the outdoor fan, and keeping the rotational speed of the indoor fan unchanged; When the air conditioner enters the second non-reversing defrosting mode, controlling the compressor to operate at a second operating frequency, stopping the outdoor fan, and reducing the rotational speed of the indoor fan at a preset rate; where the first operating frequency is less than the second operating frequency.

38. A computer-readable storage medium, characterized in that, A computer program is stored thereon, and when the computer program is executed by a processor, it implements the control method of the air conditioner according to any one of claims 26-37.

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