Air conditioner, control method of air conditioner, and readable storage medium

Abstract

The application discloses an air conditioner, a control method of the air conditioner and a readable storage medium. The air conditioner comprises a heating pipeline which is connected with an indoor heat exchanger of the air conditioner in parallel, or the heating pipeline is connected with a pipeline connected with an outlet of the indoor heat exchanger in parallel. The heating pipeline comprises a heating part which is arranged on a bottom plate of the air conditioner. A control valve is arranged on the heating pipeline and used for controlling refrigerant flow of the heating pipeline. According to the embodiment of the application, system refrigerant heat exchange is directly adopted, and the refrigerant after heat exchange flows back to a heating circulation loop, so that ice is removed without wasting heat and without consuming electric energy, and safe, energy-saving and effective ice removal is realized.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more particularly to an air conditioner, an air conditioner control method, and a readable storage medium. Background Technology

[0002] When an air conditioner is operating in a low-temperature environment and heating, the condenser will frost up. Defrosting can be achieved through a certain defrosting procedure. The water produced during defrosting will flow through the chassis and then be discharged from the outdoor unit.

[0003] However, in cold regions, the water produced during defrosting can easily freeze into ice before it drains from the unit, accumulating on the chassis of the outdoor unit. In heavy snow, snowflakes also accumulate on the chassis. Over time, this ice buildup can gradually fill the chassis, affecting normal drainage. Excessive ice buildup can even interfere with the normal rotation of the fan.

[0004] Currently, the common method for removing frost from the outdoor unit chassis is to place an electric heating element on the chassis, using electricity to heat the element and thus defrost it. However, in practical use, it has been found that this method has at least the following drawbacks:

[0005] 1. Electric heating elements consume a lot of electricity when defrosting, wasting energy;

[0006] 2. Since the electric heating element needs to be powered, there is a safety issue when the water generated during the de-icing process comes into contact with electricity.

[0007] It should be noted that the above content is only used to help understand the technical problem solved by the present invention, and does not represent an admission that the above content is prior art. Summary of the Invention

[0008] The main objective of this invention is to provide an air conditioner, an air conditioner control method, and a readable storage medium, which aims to utilize the heat generated by the air conditioning system itself during operation to remove frost from the chassis, thereby achieving safe, energy-saving, and effective de-icing.

[0009] To achieve the above objectives, the present invention provides an air conditioner, the air conditioner comprising:

[0010] The heating pipe is connected in parallel with the indoor heat exchanger of the air conditioner, or the heating pipe is connected in parallel with the pipe connected to the outlet of the indoor heat exchanger; the heating pipe includes a heating section, which is disposed on the chassis of the air conditioner;

[0011] A control valve is provided on the heating pipeline and is used to control the refrigerant flow rate of the heating pipeline.

[0012] Optionally, the heating pipe is connected in parallel with the indoor heat exchanger of the air conditioner. The air conditioner also includes a flash evaporator, which includes a liquid-side inlet, a liquid-side outlet, and a gas-side outlet. The flash evaporator is connected in series with the heating pipe. The liquid-side inlet and the liquid-side outlet are connected to the heating pipe. The gas-side outlet is connected to the compressor return port of the air conditioner, so that part of the refrigerant after heat exchange with the chassis flows to the outdoor heat exchanger through the flash evaporator, and part of the refrigerant flows to the compressor return port.

[0013] Optionally, a throttling device is connected in series between the outdoor heat exchanger and the indoor heat exchanger of the air conditioner, and the pipe connecting the outlet of the indoor heat exchanger is the pipe between the heating pipe and the indoor heat exchanger and the throttling device.

[0014] Optionally, the heating element includes a heating coil, which is distributed at the bottom and / or top of the chassis.

[0015] To achieve the above objectives, the present invention also provides a control method for an air conditioner, the control method comprising the following steps:

[0016] Determine if the de-icing conditions of the outdoor unit's chassis are met, and obtain the target opening degree of the control valve on the heating pipe of the air conditioner;

[0017] Increase the opening degree of the control valve to the target opening degree.

[0018] Optionally, the step of obtaining the target opening degree of the control valve located in the chassis heat exchange pipe of the chassis includes:

[0019] Obtain the outdoor ambient temperature and / or the current operating frequency of the compressor;

[0020] The target opening degree of the control valve on the heating pipeline is determined based on the outdoor ambient temperature and / or the current operating frequency.

[0021] Optionally, the control method for the air conditioner includes:

[0022] When the outdoor unit of the air conditioner detects that its cooling defrosting operation has ended and it switches to heating mode, it is determined that the de-icing conditions for the outdoor unit's chassis are met; or,

[0023] When the outdoor unit of the air conditioner is detected to have finished its cooling and defrosting operation and switched to heating mode, the current running time of the compressor is obtained, and if the running time is greater than or equal to the defrosting cycle, it is determined that the chassis defrosting conditions of the outdoor unit are met.

[0024] Optionally, after determining that the chassis de-icing conditions of the outdoor unit are met when the runtime is greater than or equal to the de-icing cycle, the method further includes:

[0025] Obtain the defrosting cycle of the outdoor unit mentioned above, and correct the defrosting cycle accordingly;

[0026] The defrosting cycle is updated using the revised defrosting cycle.

[0027] The present invention also provides an air conditioner, the air conditioner including a memory, a processor, and a control program stored in the memory and executable on the processor, wherein when the control program is executed by the processor, it implements the various steps of the control method of the air conditioner as described above.

[0028] The present invention also provides a storage medium storing a control program, which, when executed by a processor, implements the various steps of the control method for an air conditioner as described above.

[0029] The air conditioner, air conditioner control method, and readable storage medium provided by this invention transfer a portion of the high-temperature refrigerant to the outdoor unit chassis via a heating pipe connected in parallel to the indoor heat exchanger for high-temperature refrigerant de-icing. Alternatively, a heating pipe is connected in parallel to the outlet side of the indoor heat exchanger to transfer the condensed liquid high-temperature refrigerant from the indoor heat exchanger to the outdoor unit chassis for refrigerant de-icing. Compared to installing an electric heating element on the chassis, this embodiment directly uses system refrigerant heat exchange, and the refrigerant after heat exchange flows back to the heating cycle loop. De-icing is achieved without wasting heat or consuming electricity, thus realizing safe, energy-saving, and effective de-icing. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the hardware architecture of the air conditioner according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the system structure of an embodiment of the air conditioner of the present invention;

[0032] Figure 3 This is a schematic diagram of the system structure of another embodiment of the air conditioner of the present invention;

[0033] Figure 4 This is a flowchart illustrating an embodiment of the control method for an air conditioner according to the present invention;

[0034] Figure 5 This is a flowchart illustrating another embodiment of the control method for an air conditioner according to the present invention;

[0035] Figure 6 This is a schematic diagram of the state of the control valve involved in the control method of the air conditioner of the present invention.

[0036] Explanation of icon numbers:

[0037]

[0038]

[0039] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0040] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0041] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the invention to those skilled in the art.

[0042] Because air conditioners operate in cold regions for heating, the outdoor unit is prone to frosting. Frost buildup severely impacts heating performance. Therefore, air conditioners perform a defrost cycle periodically during heating in cold areas. This defrosting process generates water, which flows through the chassis and drains from the outdoor unit. However, this water can freeze before draining from the unit, accumulating on the chassis. In heavy snow, snowflakes also accumulate on the chassis. Over time, this ice buildup can obstruct proper drainage, and excessive ice buildup can even interfere with the fan's rotation.

[0043] Based on this, this embodiment improves the system structure of the air conditioner so that the chassis de-icing process does not require the addition of an electric heating element, which is safe and energy-saving, and does not affect the heat exchange performance of the air conditioner.

[0044] As in one embodiment, please refer to Figure 2 The air conditioner includes a compressor, a four-way valve, an indoor heat exchanger, a throttling device, and an outdoor heat exchanger. The compressor's exhaust port is connected to the four-way valve. During heating, the four-way valve connects the compressor's exhaust port to the indoor heat exchanger and also connects the compressor's return port to the outdoor heat exchanger. The outdoor heat exchanger and the indoor heat exchanger are connected, and the throttling device is connected in series between them. Thus, the compressor, four-way valve, indoor heat exchanger, throttling device, and outdoor heat exchanger form a heating cycle loop.

[0045] A heating pipe is added to the air conditioner, and the heating pipe is connected in parallel with the indoor heat exchanger. One end of the heating pipe is connected between the compressor's exhaust port and the indoor heat exchanger, and the other end is connected between the indoor heat exchanger and the throttling device. When the air conditioner is operating in heating mode, part of the high-temperature, high-pressure refrigerant discharged from the compressor's exhaust port flows into the indoor heat exchanger, where it condenses and heats up, while the rest flows into the heating pipe, causing its temperature to rise. The heating pipe passes through the chassis of the outdoor unit of the air conditioner, and the heated pipe exchanges heat with the chassis, thus removing ice from the chassis.

[0046] The air conditioner also includes a control valve located on the heating pipe to control the refrigerant flow rate. When the chassis does not require defrosting, the control valve closes the heating pipe to prevent refrigerant from flowing directly back to the outdoor heat exchanger without performing work in the indoor heat exchanger, thus avoiding energy waste. When the chassis requires defrosting, the control valve opens the heating pipe, allowing some refrigerant to enter and defrost the chassis. If the user has high heating demands and there is frost in the chassis, the control valve can be adjusted to a position greater than 0 degrees but less than the preset opening, allowing a small amount of refrigerant to enter the heating pipe and refrost it.

[0047] Optionally, in some embodiments, the control valve is an electronic expansion valve, and the opening degree of the control valve is adjustable. For example, the controller adjusts the opening degree of the electronic expansion valve according to the condition of the chassis being icy, or according to the difference between the indoor ambient temperature and the set temperature.

[0048] Optionally, the heating pipes can directly contact the chassis to exchange heat with the ice on the chassis. Alternatively, in another optional embodiment, the heating pipes are provided with a heating section, which is a heating coil. The heating coil is distributed at the bottom and / or top of the chassis and is arranged to spiral along the chassis, increasing the contact area between the heating pipes and the chassis, increasing the de-icing area, and ensuring that all frost on the chassis is completely removed, resulting in more effective de-icing.

[0049] In this embodiment, a heating pipe is connected in parallel to the indoor heat exchanger to transfer part of the high-temperature refrigerant to the outdoor unit chassis for de-icing. Compared with setting an electric heating tube on the chassis, this embodiment directly uses the system refrigerant for heat exchange, and the refrigerant after heat exchange flows back to the heating cycle loop. This not only avoids wasting heat, but also enables de-icing without the need for electric heating, achieving safe, energy-saving and effective de-icing.

[0050] Optionally, when the control valve is opened during the heating process of the air conditioner, some refrigerant will flow directly from the heating pipe to the outdoor heat exchanger after heat exchange through the chassis. Therefore, the refrigerant flow to the indoor heat exchanger is relatively reduced, which will lead to a certain reduction in the heating capacity of the indoor side, thereby affecting the heat exchange effect of the indoor heat exchanger.

[0051] Furthermore, considering that after the control valve is opened, the high-temperature exhaust from the compressor outlet is split into two, most of the exhaust is introduced into the indoor side for heating, and a small portion of the exhaust is introduced into the chassis through the heating pipe via the control valve opening setting. The high-temperature exhaust is used to dissolve the snow, ice, and frost on the chassis. After the ice, snow, and frost condense, the pressure of this small portion of exhaust is still relatively high, and it still has some utilization value.

[0052] Based on this, in a further embodiment of the present invention, the air conditioner further includes a flash evaporator, the heating pipeline is connected in parallel with the indoor heat exchanger of the air conditioner, the air conditioner further includes a flash evaporator, the flash evaporator includes a liquid-side inlet, a liquid-side outlet and a gas-side outlet, the flash evaporator is connected in series with the heating pipeline, the liquid-side inlet and the liquid-side outlet are connected to the heating pipeline (e.g., the liquid-side inlet is connected to the outlet of the control valve, and the liquid-side outlet is connected to the outlet of the indoor heat exchanger), and the gas-side outlet is connected to the compressor return port of the air conditioner, so that part of the refrigerant after heat exchange with the chassis flows to the outdoor heat exchanger through the flash evaporator, and part of the refrigerant flows to the compressor return port.

[0053] Thus, the refrigerant, after heat exchange with the chassis, enters the flash evaporator from its liquid-side inlet. Under the pressure reduction effect of the flash evaporator, gas-liquid separation of the refrigerant is achieved. The gaseous refrigerant portion flows back from the gas-side outlet to the compressor return port, entering the compressor and increasing the high-pressure gaseous refrigerant inside. This increases the discharge volume at the compressor's exhaust port, thereby compensating for the amount of refrigerant in the indoor heat exchanger and reducing the impact of chassis de-icing on the heat exchange of the indoor heat exchanger. The liquid refrigerant portion flows from the liquid-side outlet to the throttling device, and then, after passing through the throttling device, flows to the outdoor heat exchanger, where heat exchange takes place.

[0054] Optionally, the control valve is located between the flash evaporator and the heating coil of the heating pipeline. The control valve can control the flow rate of the refrigerant flowing through the chassis; it can also throttle and depressurize the refrigerant after it has been de-iced and turned into a two-phase gas-liquid refrigerant before it enters the flash evaporator.

[0055] The refrigerant, after undergoing a first throttling process, enters the flash evaporator. The flash evaporator structure further reduces the pressure of this throttled liquid refrigerant through a second flash evaporation, causing it to release more gaseous refrigerant. The refrigerant that has exchanged heat with the chassis then enters the flash evaporator from its liquid-side inlet. The gaseous refrigerant portion flows back from its gas-side outlet to the compressor's return port, entering the compressor. This increases the high-pressure gaseous refrigerant in the compressor, increasing the compressor's discharge volume and thus compensating for the amount of refrigerant in the indoor heat exchanger, reducing the impact of chassis de-icing on the indoor heat exchanger's heat exchange. The liquid refrigerant portion flows from its liquid-side outlet to the throttling device, and then, after passing through the throttling device, flows to the outdoor heat exchanger, where it undergoes heat exchange.

[0056] Optionally, the flash evaporator also has the function of separating the gas and liquid refrigerant to prevent the liquid refrigerant from entering the compressor along with the gaseous refrigerant, which would reduce the reliability of the compressor and may cause "liquid slugging".

[0057] This embodiment, by adding a flash evaporator and placing a control valve between the flash evaporator and the heating coil of the heating pipeline, ensures that the vapor in the gas-liquid two-phase system returns to the compressor suction port through the pipeline, increasing the suction volume, improving the compressor output capacity, compensating for the effects of flow splitting, improving the compressor's operational reliability, and enhancing the heating effect. Furthermore, after throttling and flash evaporation, the low-pressure liquid mixes directly with the main refrigerant, and the throttling further reduces the evaporation pressure of the refrigerant on the outdoor side, improving the heat exchange effect on the outdoor side.

[0058] This embodiment uses the flash evaporator to maintain better heating performance during the de-icing of the chassis in the heating process.

[0059] Alternatively, as in another embodiment, please refer to Figure 3 The air conditioner includes a compressor, a four-way valve, an indoor heat exchanger, a throttling device, and an outdoor heat exchanger. The compressor's exhaust port is connected to the four-way valve. During heating, the four-way valve connects the compressor's exhaust port to the indoor heat exchanger and also connects the compressor's return port to the outdoor heat exchanger. The outdoor heat exchanger and the indoor heat exchanger are connected, and the throttling device is connected in series between them. Thus, the compressor, four-way valve, indoor heat exchanger, throttling device, and outdoor heat exchanger form a heating cycle loop.

[0060] During heating, the high-temperature exhaust gas from the compressor enters the indoor side, condenses and releases heat, and returns to the outdoor side before being throttled, still reaches a temperature between 30-40 degrees Celsius. This heat contained in the refrigerant is wasted if not utilized, and is directly throttled into the outer heat exchanger.

[0061] Based on this, this embodiment adds a heating pipe to the air conditioner, and the heating pipe is connected in parallel with the pipe on the outlet side of the indoor heat exchanger. Optionally, the pipe on the outlet side is the pipe between the indoor heat exchanger and the throttling device. For example, one end of the heating pipe is connected to the outlet of the indoor heat exchanger, and the other end of the heating pipe is connected to the inlet of the throttling device.

[0062] When the air conditioner is operating in heating mode, the high-temperature, high-pressure refrigerant discharged from the compressor enters the indoor heat exchanger for condensation and heating. After condensation and heating, the refrigerant flows out of the indoor heat exchanger, with a portion flowing into the heating pipes, causing the temperature of the heating pipes to rise. The heating pipes pass through the chassis of the outdoor unit of the air conditioner, and the heated heating pipes exchange heat with the chassis, thus removing ice from the chassis. The remaining refrigerant flows to the throttling device and then enters the outdoor heat exchanger.

[0063] Alternatively, the refrigerant after condensation and heat release in the indoor heat exchanger may not directly enter the throttling device. Instead, all the refrigerant may be transported to the heating pipeline, where it undergoes heat exchange through the chassis. The residual heat of the refrigerant is used to remove snow, defrost, and ice from the chassis, further reducing the pressure and temperature of the refrigerant before throttling, before it is throttled and evaporated.

[0064] The air conditioner also includes a control valve located on the heating pipe to control the refrigerant flow rate. When the chassis does not require defrosting, the control valve closes the heating pipe to prevent refrigerant from flowing directly back to the outdoor heat exchanger without performing work in the indoor heat exchanger, thus avoiding energy waste. When the chassis requires defrosting, the control valve opens the heating pipe, allowing some refrigerant to enter and defrost the chassis. If the user has high heating demands and there is frost in the chassis, the control valve can be adjusted to a position greater than 0 degrees but less than the preset opening, allowing a small amount of refrigerant to enter the heating pipe and refrost it.

[0065] Optionally, in some embodiments, the control valve is an electronic expansion valve, and the opening degree of the control valve is adjustable. For example, the controller adjusts the opening degree of the electronic expansion valve according to the condition of the chassis being icy, or according to the difference between the indoor ambient temperature and the set temperature.

[0066] Optionally, the heating element can directly contact the chassis to exchange heat with the ice on the chassis. Alternatively, in another optional embodiment, the heating pipe is provided with a heating section, which is a heating coil. The heating coil is distributed at the bottom of the chassis and is spiraled along the bottom of the chassis to increase the contact area between the heating element and the chassis, thereby increasing the de-icing area and ensuring that all frost on the chassis is completely removed, resulting in more effective de-icing.

[0067] In this embodiment, a heating pipe is connected in parallel to the outlet pipe of the indoor heat exchanger to transfer the condensed liquid high-temperature refrigerant to the outdoor unit chassis for refrigerant de-icing. Compared to installing an electric heating element on the chassis, this embodiment directly uses system refrigerant heat exchange, and the refrigerant after heat exchange flows back into the heating cycle loop, reducing costs and power consumption. Snow, ice, and frost can also be used to further condense and subcool the refrigerant, increasing the subcooling degree, reducing the condensing pressure, and simultaneously lowering the outdoor evaporation temperature, increasing the return air flow, and improving heating capacity and heating efficiency. This achieves safe, energy-saving, and effective de-icing.

[0068] Based on the above-described air conditioner structure, the present invention provides a control method for the air conditioner.

[0069] As one implementation method, the hardware environment architecture involved in the control method of the air conditioner can be as follows: Figure 1 As shown.

[0070] Specifically, the hardware architecture involved in the control method of the air conditioner may include a control terminal, which may be the air conditioner itself or a control device for the air conditioner, such as a central screen or a mobile terminal.

[0071] In one implementation, the control terminal includes: a processor 101, such as a CPU, a memory 102, and a communication bus 103. The communication bus 103 is used to establish communication between these components. The processor 101 is used to invoke an application program to execute the control process.

[0072] The memory 102 can be a high-speed RAM or a stable memory (non-volatile memory), such as a disk storage device.

[0073] It is understood that, in one embodiment, the control program that implements the control process of the air conditioner is stored in the memory 102 of the controller. When the processor 101 calls the control program from the memory 102, it performs the following operations:

[0074] Determine if the de-icing conditions of the outdoor unit's chassis are met, and obtain the target opening degree of the control valve on the heating pipe of the air conditioner;

[0075] Increase the opening degree of the control valve to the target opening degree.

[0076] Alternatively, in another embodiment, the control program that implements the control process of the air conditioner is stored in a computer-readable storage medium. When the storage medium is applied to a computer, the computer's processor 101 can invoke the control program from the storage medium to perform the following operations:

[0077] Determine if the de-icing conditions of the outdoor unit's chassis are met, and obtain the target opening degree of the control valve on the heating pipe of the air conditioner;

[0078] Increase the opening degree of the control valve to the target opening degree.

[0079] Based on the hardware architecture of the air conditioner described above, the following describes various embodiments of the control method for the air conditioner.

[0080] In one embodiment, please refer to Figure 4 The air conditioner control method proposed in this embodiment includes the following steps:

[0081] Step S10: Determine if the de-icing conditions of the outdoor unit's chassis are met, and obtain the target opening degree of the control valve on the heating pipe of the air conditioner;

[0082] Step S20: Increase the opening degree of the control valve to the target opening degree.

[0083] This embodiment uses an air conditioner as an example for illustration.

[0084] When operating in heating mode in extremely cold environments, the outdoor heat exchanger and chassis will experience varying degrees of frost and ice buildup. As a result, the air conditioner needs to be switched to cooling mode periodically to defrost the outdoor unit.

[0085] During defrosting, the four-way valve is switched, allowing the high-temperature, high-pressure gas discharged from the compressor to flow to the outdoor heat exchanger. There, the gas exchanges heat with the frost, melting it into water. During refrigeration defrosting, the control valve is normally closed. Alternatively, if concentrated high-temperature exhaust gas is needed for outdoor heat exchanger defrosting, the control valve can be kept at a small, fixed opening during defrosting, achieving overall unit defrosting while slowly de-icing, defrosting, and snow removal from the chassis.

[0086] During the outdoor unit's defrosting process, water from the outdoor heat exchanger is drained through the chassis, causing increasing ice buildup. After the outdoor unit defrosts and the system switches to heating mode, the system needs to perform a de-icing operation on the chassis.

[0087] Therefore, after the outdoor unit defrosts and the air conditioner meets the de-icing conditions for the outdoor unit chassis, the control valve is opened. Alternatively, the target opening degree of the control valve is obtained, and the opening degree of the control valve is increased to the target opening degree, allowing some high-pressure refrigerant to enter the chassis for heat exchange and de-icing.

[0088] Optionally, in some embodiments, when the outdoor unit of the air conditioner is detected to have finished its cooling defrosting operation and switched to heating mode, it is determined that the conditions for chassis de-icing of the outdoor unit are met, and the control valve is controlled to increase to the target opening degree to de-ic the chassis. That is, chassis de-icing is performed after the cooling defrosting operation ends and the unit is switched to heating mode.

[0089] Alternatively, in some embodiments, when the outdoor unit of the air conditioner is detected to have finished its cooling defrosting operation and switched to heating mode, the current running time of the compressor is obtained, and if the running time is greater than or equal to the defrosting cycle, it is determined that the chassis defrosting conditions of the outdoor unit are met.

[0090] That is, after the outdoor unit of the air conditioner finishes defrosting, it switches back to heating mode and, when it reaches the preset defrosting cycle, adjusts the control valve to the target opening to defrost the chassis.

[0091] It is understood that the defrosting cycle refers to the time from the end of defrosting and switching to heating mode to the start of the defrosting process. The defrosting cycle can be a preset fixed value or it can be determined based on the defrosting cycle.

[0092] In this embodiment, after the cooling and defrosting are completed, the de-icing operation is performed after a preset time. This is to allow the indoor temperature to stabilize before de-icing the refrigerant in stages, and also to allow the chassis to drain all the water that can be drained before de-icing.

[0093] Optionally, in a further embodiment, when the system begins the de-icing process during the entire operation is calculated based on the defrosting interval time detected by the system. Optionally, the following formula is used for calculation:

[0094] T = k3 * T1 + ▲t;

[0095] Where T represents the defrosting cycle after the current cooling defrost operation ends; T1 represents the defrosting cycle of the previous cooling defrost mode (e.g., if the compressor started and defrosted for 60 minutes, then T1 = 60); ▲t represents time compensation, and k3 represents the time coefficient. This calculates when the defrosting program is expected to start after the cooling defrost operation ends. The system needs to continuously iterate and update the defrosting cycle until the system is shut down or the outdoor ambient temperature rises above 0 degrees Celsius.

[0096] Based on this, the defrosting cycle can be calculated based on the previous defrosting cycle after the current refrigeration defrosting operation ends and the system switches to heating mode. Then, when the running time reaches the defrosting cycle, the opening of the control valve is increased to start the defrosting program.

[0097] Alternatively, the defrosting cycle can be calculated after the previous refrigeration defrosting operation ends, and used as the defrosting cycle for the next operation. If the operating time is greater than or equal to the defrosting cycle, after determining that the outdoor unit's chassis defrosting conditions are met, the process further includes:

[0098] Obtain the defrosting cycle of the outdoor unit mentioned above, and correct the defrosting cycle accordingly;

[0099] The defrosting cycle is updated using the revised defrosting cycle.

[0100] In this way, after the next outdoor unit defrost cycle, the updated defrost cycle can be obtained directly to determine whether the current running time meets the chassis de-icing conditions, and then the de-icing procedure can be performed.

[0101] Compared to the previous embodiment, this embodiment can directly obtain the defrosting cycle after the outdoor unit defrosts, eliminating the need for calculation, saving calculation time, rationally allocating computing resources, and improving efficiency.

[0102] Optionally, the target opening can be a fixed value. For example, if experimental testing determines that during the de-icing process, the target opening of the control valve ensures high de-icing efficiency while minimizing the impact on indoor heating.

[0103] Alternatively, in another embodiment, please refer to Figure 5 The target opening degree varies depending on environmental factors or the operating frequency of the compressor.

[0104] Optionally, the step of obtaining the target opening degree of the control valve located in the chassis heat exchange pipe of the chassis includes:

[0105] Step S11: Obtain the outdoor ambient temperature and / or the current operating frequency of the compressor;

[0106] Step S12: Determine the target opening degree of the control valve on the heating pipeline based on the outdoor ambient temperature and / or the current operating frequency.

[0107] When the air conditioner is operating normally in heating mode, if the outdoor temperature is above 0 degrees Celsius, the chassis will not ice up, and the control valve can remain closed. However, when the outdoor temperature is below 0 degrees Celsius, frost may form on the outdoor unit and the chassis. The degree of frost formation on the outdoor unit depends on the ambient outdoor temperature. De-icing efficiency depends on the amount of refrigerant, which in turn depends on the compressor's operating frequency.

[0108] Therefore, in order to improve the chassis de-icing control effect and enhance the system's operational stability while effectively de-icing, this embodiment sets different target opening degrees corresponding to different outdoor ambient temperatures and / or different compressor operating frequencies.

[0109] Optionally, the target opening degree is linearly related to the outdoor ambient temperature and / or the operating frequency. The higher the outdoor ambient temperature, the smaller the target opening degree, and vice versa. The higher the compressor's operating frequency, the larger the target opening degree can be adjusted; the lower the compressor's operating frequency, the smaller the target opening degree can be adjusted. The target opening degree and the outdoor ambient temperature or the operating frequency are associated through a one-to-one mapping relationship, or through a fixed proportional coefficient.

[0110] Optionally, in a bivariate control system, such as in an embodiment where the target opening degree is determined based on the outdoor ambient temperature and the compressor's operating frequency, the target opening degree can be calculated using the following formula:

[0111] K = k1*t + k2*f + b;

[0112] Wherein, K is the target opening degree; t is the outdoor ambient temperature; f is the current operating frequency of the compressor; k1 is the temperature coefficient; k2 is the frequency coefficient; and b is the opening degree compensation.

[0113] That is, by collecting the outdoor ambient temperature and the current operating frequency of the compressor in real time or at regular intervals, the target opening degree of the control valve is determined during the current de-icing process. Then, during the de-icing process, the control valve is increased to the target opening degree, so as to achieve rapid de-icing while ensuring stable operation of the air conditioner's heating system.

[0114] Optionally, the temperature coefficient k1, frequency coefficient k2, and opening compensation b can be preset fixed values, or they can be non-fixed values.

[0115] In an optional embodiment, the temperature coefficient k1, frequency coefficient k2, and opening compensation b vary depending on the outdoor ambient temperature. That is, the step of determining the target opening of the control valve on the heating pipeline based on the outdoor ambient temperature and / or the current operating frequency includes:

[0116] The temperature coefficient, frequency coefficient, and opening compensation are determined based on the temperature range of the outdoor ambient temperature.

[0117] The target opening degree is determined based on the outdoor ambient temperature and its temperature coefficient, the current operating frequency and its frequency coefficient, and the opening degree compensation.

[0118] In this embodiment, at least two temperature ranges are preset, and the temperature coefficient, frequency coefficient, and opening compensation corresponding to each temperature range are different. After obtaining the outdoor ambient temperature, the corresponding temperature coefficient, frequency coefficient, and opening compensation are obtained based on the temperature range where the outdoor environment is located, and then the target opening is calculated based on the temperature coefficient, frequency coefficient, and opening compensation, thereby improving the accuracy of target opening calculation.

[0119] Optionally, the temperature coefficient k1, frequency coefficient k2, and opening compensation b are verified and set according to different air conditioners.

[0120] This embodiment takes a specific embodiment as an example to illustrate the size of the target opening and its specific relationship with the outdoor ambient temperature:

[0121] For example, when the outdoor ambient temperature is -5 < T4 < 0, the target opening K2: 2), when -10 < T4 < -5, the target opening K3: 3), when T4 < -10, the target opening K4 > 3. Where K4 > K3 > K2.

[0122] Optionally, in combination with reference to Figure 6 This embodiment lists the state change process of the control valve during the entire operation of the air conditioner:

[0123] When the air conditioner starts up and operates in cooling mode, the control valve is in the closed state.

[0124] When the air conditioner operates in the defrosting mode of the outdoor unit, if the outdoor ambient temperature is greater than the preset value (such as zero degree), the control valve is controlled to be in the closed state. If the outdoor ambient temperature is less than the preset value, the control valve is controlled to open with a smaller opening K1, K1 < K2, and a small part of the refrigerant enters the heating pipeline for deicing.

[0125] After the defrosting of the outdoor unit is completed, it switches to the heating mode and operates normally in the heating mode.

[0126] When the operation duration reaches the deicing cycle, if the outdoor ambient temperature reaches above the preset value, the control valve is maintained in the closed state. If the outdoor ambient temperature is lower than the preset value, the target opening of the control valve is calculated according to the outdoor ambient temperature and the compressor operation frequency, and deicing is performed according to the corresponding target opening.

[0127] After the deicing program is completed, the deicing is restarted when the outdoor unit defrosts in the next cycle.

[0128] It should be noted that the above is only the preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, is equally included in the patent protection scope of the present invention.

Claims

1. A control method for an air conditioner, characterized in that, The air conditioner includes: The heating pipe is connected in parallel with the pipe connecting to the outlet of the indoor heat exchanger; the heating pipe includes a heating section, which is disposed on the chassis of the air conditioner; A control valve is provided on the heating pipeline for controlling the refrigerant flow rate of the heating pipeline; The control method for the air conditioner includes the following steps: Determine if the de-icing conditions of the outdoor unit's chassis are met, and obtain the target opening degree of the control valve on the heating pipe of the air conditioner; Increase the opening degree of the control valve to the target opening degree; The step of determining whether the outdoor unit's chassis de-icing conditions are met includes: When the outdoor unit of the air conditioner is detected to have finished its cooling and defrosting operation and switched to heating mode, the current running time of the compressor is obtained, and if the running time is greater than or equal to the defrosting cycle, it is determined that the chassis defrosting conditions of the outdoor unit are met. The defrosting cycle is calculated based on the previous defrosting cycle after the current cooling and defrosting operation ends and the system switches to heating mode. Alternatively, the defrosting cycle is calculated after the previous refrigeration defrosting operation is completed, and used as the defrosting cycle for the next defrosting operation; The step of obtaining the target opening degree of the control valve on the heating pipe of the air conditioner includes: Obtain the outdoor ambient temperature and the compressor's current operating frequency; The target opening degree of the control valve on the heating pipeline is determined based on the outdoor ambient temperature and the current operating frequency. The target opening is calculated using the following formula: K = k1*t + k2*f + b; Where K is the target opening degree; t is the outdoor ambient temperature; f is the current operating frequency of the compressor; k1 is the temperature coefficient; k2 is the frequency coefficient; and b is the opening degree compensation. The steps for determining the target opening degree of the control valve on the heating pipeline based on the outdoor ambient temperature and the current operating frequency include: The temperature coefficient, frequency coefficient, and opening compensation are determined based on the temperature range of the outdoor ambient temperature. The target opening degree is determined based on the outdoor ambient temperature and its temperature coefficient, the current operating frequency and its frequency coefficient, and the opening degree compensation.

2. The control method for an air conditioner as described in claim 1, characterized in that, When the defrosting cycle is calculated after the previous refrigeration defrosting operation and used as the defrosting cycle for the next operation, after determining that the outdoor unit's chassis defrosting conditions are met when the operating time is greater than or equal to the defrosting cycle, the process further includes: Obtain the defrosting cycle of the outdoor unit mentioned above, and correct the defrosting cycle accordingly; The defrosting cycle is updated using the revised defrosting cycle.

3. An air conditioner, characterized in that, The air conditioner includes a memory, a processor, and a control program stored in the memory and executable on the processor, wherein the control program, when executed by the processor, implements the steps of the control method for the air conditioner as described in any one of claims 1 to 2.

4. A storage medium, characterized in that, The storage medium stores a control program, which, when executed by a processor, implements the steps of the control method for an air conditioner as described in any one of claims 1 to 2.

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