Evaporator anti-freezing method and device, outdoor unit, air conditioning equipment and storage medium

Abstract

The invention relates to an evaporator anti-freezing method and device, an outdoor unit, air conditioning equipment and a storage medium. The method comprises the steps that an outdoor unit calculates a first evaporator parameter of an evaporator in an indoor unit by detecting a first compressor parameter and a first condenser parameter of a compressor, and whether the evaporator is frosted or not is judged according to the change condition of the first evaporator parameter within a first preset duration; if it is judged that the evaporator is frosted based on the calculated first evaporator parameter, a compressor is controlled to operate in an anti-freezing mode in a frequency reduction mode, the outdoor unit can judge the frosting state of the evaporator without communicating with the indoor unit, and an anti-freezing mechanism is started; therefore, the problem of how to prevent the evaporator from frosting and freezing under the condition that the indoor unit and the outdoor unit do not communicate with each other is solved.

Description

Technical Field

[0001] The present application relates to the field of air conditioning technology, and in particular to an evaporator anti-freezing method, device, outdoor unit, air conditioning equipment and storage medium. Background Art

[0002] When the air conditioner evaporator operates at a lower temperature, the low pressure of the air conditioning system decreases, resulting in increased evaporator damping, reduced air volume, and further deterioration of indoor heat exchange conditions. The refrigerant cannot evaporate effectively during indoor heat exchange, resulting in a decrease in the cooling capacity of the unit and an increase in the amount of refrigerant return liquid in the system, thereby affecting the reliability of the compressor and inevitably causing evaporator frost and freezing problems.

[0003] When there is a communication link between the indoor unit and the outdoor unit, the temperature sensor can be arranged on the evaporator pipeline of the indoor unit to detect the evaporator parameters in real time to determine whether the evaporator has frosting or freezing problems, and then the start and stop of the outdoor compressor can be controlled through communication to avoid frosting of the evaporator and ensure the reliability of the system.

[0004] However, for an air-conditioning system composed of indoor and outdoor units of different manufacturers and models without communication, the outdoor unit cannot obtain the evaporator parameter status of the indoor unit to control the start and stop of the compressor. Therefore, the outdoor unit cannot prevent the evaporator of the indoor unit from frosting and freezing without communication. Summary of the invention

[0005] The present application provides an evaporator anti-freezing method, device, outdoor unit, air conditioning equipment and storage medium to solve the problem of how to prevent frost and freezing of the evaporator when there is no communication between the indoor unit and the outdoor unit.

[0006] In a first aspect, the present application provides an evaporator antifreeze method, the method comprising:

[0007] When the outdoor unit is in operation, obtaining a first compressor parameter and a first condenser parameter, wherein the outdoor unit includes a compressor and a condenser;

[0008] Determining the first evaporator parameter corresponding to the first compressor parameter and the first condenser parameter according to the correspondence between the preset compressor parameter, the preset condenser parameter and the preset evaporator parameter;

[0009] determining a frosting state of an evaporator located in an indoor unit according to the first compressor parameter and a first evaporator parameter corresponding to the first condenser parameter, wherein there is no communication link between the outdoor unit and the indoor unit;

[0010] When the frosting state is frosted, the compressor is controlled to operate at a reduced frequency according to an anti-freezing mode.

[0011] Optionally, the determining, according to the correspondence between the preset compressor parameter, the preset condenser parameter and the preset evaporator parameter, the first evaporator parameter corresponding to the first compressor parameter and the first condenser parameter comprises:

[0012] According to the correspondence between the preset operating frequency, the preset operating power, the first preset tube temperature and the second preset tube temperature, the first evaporator tube temperature corresponding to the detection operating frequency, the detection operating power and the first detected tube temperature is determined, wherein the preset compressor parameters include the preset operating frequency and the preset operating power, the preset condenser parameters include the first preset tube temperature, the preset evaporator parameters include the second preset tube temperature, the first compressor parameters include the detection operating power and the detection operating frequency, the first condenser parameters include the first detected tube temperature, and the first evaporator parameters include the first evaporator tube temperature.

[0013] Optionally, determining the frosting state of the evaporator in the indoor unit according to the first compressor parameter and the first evaporator parameter corresponding to the first condenser parameter includes:

[0014] When the operation time of the compressor reaches a first preset time, obtaining the first evaporator tube temperature at different times within the first preset time, wherein the first evaporator parameter includes the first evaporator tube temperature;

[0015] When the duration of the first evaporator tube temperature being lower than the first preset temperature is greater than or equal to a second preset duration, determining that the frosting state of the evaporator in the indoor unit indicates that the evaporator is frosted, wherein the second preset duration is less than the first preset duration; or

[0016] When the duration of the first evaporator tube temperature being lower than the first preset temperature within the second preset time is greater than or equal to the third preset time, and the first evaporator tube temperature does not exceed the second preset temperature within the second preset time, it is determined that the frosting state of the evaporator located in the indoor unit indicates that the evaporator is frosted, wherein the third preset time is less than the second preset time, and the second preset temperature is greater than the first preset temperature; or,

[0017] When the first evaporator tube temperature does not exceed the second preset temperature within the first preset time period, determining that the frosting state of the evaporator located in the indoor unit indicates that the evaporator is frosted.

[0018] Optionally, when the frosting state is frosted, controlling the compressor to operate at a reduced frequency in an anti-freezing mode includes:

[0019] When the frosting state is frosted, the compressor is controlled to gradually reduce the frequency according to a preset frequency reduction step corresponding to a preset unit time.

[0020] Optionally, when the frosting state is frosted, after controlling the compressor to gradually reduce the frequency according to a preset frequency reduction step corresponding to a preset unit time, the method further includes:

[0021] Acquire a second compressor parameter and a second condenser parameter, and determine a second evaporator parameter corresponding to the second compressor parameter and the second condenser parameter according to a correspondence relationship between the preset compressor parameter, the preset condenser parameter and the preset evaporator parameter, wherein the second evaporator parameter includes a second evaporator tube temperature;

[0022] When the second evaporator tube temperature is greater than a second preset temperature and the detection operating frequency in the second compressor parameter is greater than a preset minimum frequency, controlling the compressor to continue operating at the current detection operating frequency; or,

[0023] When the detected operating frequency in the second compressor parameter is equal to the preset minimum frequency and the second evaporator tube temperature is less than or equal to the second preset temperature, the compressor and the outdoor fan are controlled to stop running.

[0024] Optionally, when the second evaporator tube temperature is greater than a second preset temperature and the detection operating frequency in the second compressor parameter is greater than a preset minimum frequency, after controlling the compressor to continuously operate according to the current detection operating frequency, the method further includes:

[0025] Acquire a third compressor parameter and a third condenser parameter, and determine a third evaporator parameter corresponding to the third compressor parameter and the third condenser parameter according to a correspondence relationship between the preset compressor parameter, the preset condenser parameter and the preset evaporator parameter, wherein the third evaporator parameter includes a third evaporator tube temperature;

[0026] When the duration that the third evaporator tube temperature is greater than the second preset temperature exceeds the second preset time, the compressor is controlled to exit the anti-freezing mode and operate in a normal working mode.

[0027] Optionally, when the detected operating frequency in the second compressor parameter is equal to the preset minimum frequency, and the second evaporator tube temperature is less than or equal to the second preset temperature, after controlling the compressor and the outdoor fan to stop running, the method further includes:

[0028] When the stop time of the compressor reaches a fourth preset time, the compressor and the outdoor fan are controlled to operate in a normal working mode, and the step of obtaining the first compressor parameter and the first condenser parameter when the outdoor unit is in an operating state is executed, until the frosting state is frosted, the compressor is controlled to operate at a reduced frequency in an anti-freeze mode.

[0029] In a second aspect, an evaporator anti-freezing device is provided, the device comprising:

[0030] An acquisition module, used for acquiring a first compressor parameter and a first condenser parameter when the outdoor unit is in operation, wherein the outdoor unit includes a compressor and a condenser;

[0031] A determination module, configured to determine the first evaporator parameter corresponding to the first compressor parameter and the first condenser parameter according to a correspondence relationship among the preset compressor parameter, the preset condenser parameter and the preset evaporator parameter;

[0032] a judgment module, configured to determine a frosting state of an evaporator located in an indoor unit according to the first compressor parameter and a first evaporator parameter corresponding to the first condenser parameter, wherein there is no communication link between the outdoor unit and the indoor unit;

[0033] The control module is used to control the compressor to operate at a reduced frequency according to an anti-freezing mode when the frosting state is frosted.

[0034] In a third aspect, the present application provides an outdoor unit, which includes a compressor, a variable frequency drive for driving the compressor, an outdoor fan, a condenser, a temperature sensor arranged on the condenser, and a controller, wherein the controller includes the evaporator anti-freeze device as described in claim 8.

[0035] In a fourth aspect, the present application provides an air-conditioning device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned evaporator anti-freezing method when executing the computer program.

[0036] In a fifth aspect, the present application also provides a computer storage medium storing computer executable instructions, wherein the computer executable instructions are used to execute the above-mentioned evaporator anti-freezing method.

[0037] The above-mentioned technical solution provided by the embodiment of the present application has the following advantages over the prior art: the method provided by the embodiment of the present application obtains a first compressor parameter and a first condenser parameter when the outdoor unit is in operation, wherein the outdoor unit includes a compressor and a condenser; determines the first evaporator parameter corresponding to the first compressor parameter and the first condenser parameter according to the correspondence between the preset compressor parameter, the preset condenser parameter and the preset evaporator parameter; determines the frosting state of the evaporator located in the indoor unit according to the first compressor parameter and the first evaporator parameter corresponding to the first condenser parameter, wherein there is no communication link between the outdoor unit and the indoor unit; when the frosting state is frosted, controls the compressor to operate at a reduced frequency in an anti-freeze mode.

[0038] Based on the above method, the outdoor unit calculates the first evaporator parameter of the evaporator in the indoor unit by detecting the first compressor parameter and the first condenser parameter of the compressor, and determines whether the evaporator is frosted according to the change of the first evaporator parameter within the first preset time period. If the evaporator is determined to be frosted based on the calculated first evaporator parameter, the compressor is controlled to operate at a reduced frequency according to the anti-freeze mode. The outdoor unit can determine the frosting state of the evaporator and start the anti-freeze mechanism without communicating with the indoor unit, thereby solving the problem of how to prevent the evaporator from frosting and freezing when there is no communication between the indoor unit and the outdoor unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0041] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0042] Figure 1 An application environment diagram of an evaporator anti-freezing method provided in an embodiment of the present application;

[0043] Figure 2 A schematic flow chart of an evaporator anti-freezing method provided in an embodiment of the present application;

[0044] Figure 3 This is a schematic diagram of the corresponding relationship under the preset evaporator tube temperature of -5°C provided in the embodiment of the present application;

[0045] Figure 4 This is a schematic diagram showing the corresponding relationship under the preset evaporator tube temperature of 0°C provided in the embodiment of the present application;

[0046] Figure 5 A schematic flow chart of an evaporator anti-freezing method provided in an embodiment of the present application;

[0047] Figure 6 A schematic flow chart of an evaporator anti-freezing method provided in an embodiment of the present application;

[0048] Figure 7 A schematic flow chart of an evaporator anti-freezing method provided in an embodiment of the present application;

[0049] Figure 8 A schematic flow chart of an evaporator anti-freezing method provided in an embodiment of the present application;

[0050] Fig. 9 A structural block diagram of an evaporator anti-freezing device provided in an embodiment of the present application;

[0051] Fig.10 A schematic diagram of the internal structure of an air-conditioning device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0053] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0054] Figure 1 FIG. 1 is an application environment diagram of an evaporator antifreeze method in an embodiment. Figure 1The evaporator anti-freezing method is applied to an air-conditioning device, which includes an indoor unit 120 of any model and an outdoor unit 110, and there is no communication link between the outdoor unit 110 and the indoor unit 120. The outdoor unit 110 includes a compressor, a variable frequency drive for driving the compressor, an outdoor fan, a condenser, a temperature sensor arranged on the condenser, and a controller. The controller includes an evaporator anti-freezing device, which is used to detect the operating parameters of the compressor and the condenser parameters of the condenser, and calculate the evaporator parameters of the evaporator in the indoor unit 120 based on the operating parameters and the condenser parameters, and judge whether the evaporator is frosted or frozen according to the evaporator parameters, and control the compressor to enter the anti-freezing mode when it is judged that the evaporator is frosted or frozen, so as to prevent the evaporator from continuing to frost or freeze, and alleviate the frosting of the evaporator, and prevent the compressor from continuously returning the refrigerant due to the frosting of the evaporator, so as to ensure the operating reliability of the compressor.

[0055] Since the outdoor unit 110 can determine whether frosting occurs on the evaporator in the indoor unit 120 without communicating with the indoor unit 120, without additionally detecting the evaporator parameters in the indoor unit 120, and without adding an additional evaporator parameter sensor, the outdoor unit 110 can be combined with any type of indoor unit 120 to form an air-conditioning device, so as to improve the adaptability of the outdoor unit 110 and save the hardware cost of the outdoor unit 110 for determining frost on the evaporator.

[0056] In one embodiment, Figure 2 FIG. 1 is a flow chart of an evaporator antifreeze method in an embodiment, referring to FIG. Figure 2 , provides an evaporator antifreeze method. This embodiment mainly applies this method to the above Figure 1 Taking the outdoor unit 110 in FIG. 1 as an example, the evaporator anti-freezing method specifically includes the following steps:

[0057] Step S210: when the outdoor unit 110 is in operation, obtaining a first compressor parameter and a first condenser parameter, wherein the outdoor unit 110 includes a compressor and a condenser.

[0058] Specifically, when the outdoor unit 110 is in operation, the outdoor unit 110 will collect the first compressor parameters of the compressor and the first condenser parameters of the condenser in real time. The first compressor parameters and the first condenser parameters are used to determine the evaporator parameters of the evaporator in the indoor unit 120. The condenser parameters are the first detection tube temperature or the condensing pressure. The first detection tube temperature is the saturation temperature corresponding to the condensing pressure. There is a corresponding relationship between the condenser parameters and the condensing pressure. Therefore, the first detection tube temperature or the condensing pressure can be used to represent the condenser parameters. The condensing pressure is used to indicate the system high pressure corresponding to the air-conditioning equipment.

[0059] Step S220: determining the first evaporator parameter corresponding to the first compressor parameter and the first condenser parameter according to the correspondence between the preset compressor parameter, the preset condenser parameter and the preset evaporator parameter.

[0060] Specifically, the compressor specification includes the correspondence between the preset operating parameters, the preset condenser parameters, and the preset evaporator parameters. Therefore, based on the correspondence between the preset operating parameters, the preset condenser parameters, and the preset evaporator parameters, the first compressor parameter and the first evaporator parameter corresponding to the first condenser parameter can be queried. The evaporator parameter is the evaporator tube temperature or the evaporation pressure. When the condenser parameter is the first detection tube temperature, the evaporator parameter is the evaporator tube temperature; when the condenser parameter is the condensation pressure, the evaporator parameter is the evaporation pressure. The evaporator tube temperature is the saturation temperature corresponding to the evaporation pressure, that is, there is also a correspondence between the evaporator tube temperature and the evaporation pressure. The evaporator parameter can be represented by only the evaporator tube temperature or the evaporation pressure. The evaporation pressure is used to indicate the system low pressure of the air-conditioning equipment.

[0061] Step S230 , determining a frosting state of the evaporator in the indoor unit 120 according to the first compressor parameter and the first evaporator parameter corresponding to the first condenser parameter, wherein there is no communication link between the outdoor unit 110 and the indoor unit 120 .

[0062] Specifically, since the first evaporator parameter is the evaporator tube temperature or the evaporation pressure, the frosting state of the evaporator in the indoor unit 120 can be determined according to the first evaporator parameter, and the frosting state is frosted or not frosted.

[0063] Step S240, when the frosting state is frosted, controlling the compressor to operate at a reduced frequency according to an anti-freezing mode.

[0064] Specifically, when the outdoor unit 110 determines that the evaporator in the indoor unit 120 is frosted, it controls the compressor to operate at a reduced frequency in the anti-freeze mode to reduce the cooling capacity, prevent the evaporator from continuing to frost or freeze, and alleviate the frosting of the evaporator, prevent the compressor from continuously returning the refrigerant due to frosting of the evaporator, thereby ensuring the operating reliability of the compressor.

[0065] The outdoor unit 110 calculates the first evaporator parameter of the evaporator in the indoor unit 120 by detecting the first compressor parameter and the first condenser parameter of the compressor, and determines whether the evaporator is frosted according to the change of the first evaporator parameter within a first preset time period. If the evaporator is determined to be frosted based on the calculated first evaporator parameter, the compressor is controlled to operate at a reduced frequency according to the anti-freeze mode. The outdoor unit 110 can determine the frosting state of the evaporator and start the anti-freeze mechanism without communicating with the indoor unit 120, thereby solving the problem of how to prevent the evaporator from frosting and freezing when there is no communication between the indoor unit 120 and the outdoor unit 110.

[0066] In one embodiment, the determining the first evaporator parameter corresponding to the first compressor parameter and the first condenser parameter according to the correspondence between the preset compressor parameter, the preset condenser parameter and the preset evaporator parameter includes:

[0067] According to the correspondence between the preset operating frequency, the preset operating power, the first preset tube temperature and the second preset tube temperature, the first evaporator tube temperature corresponding to the detection operating frequency, the detection operating power and the first detected tube temperature is determined, wherein the preset compressor parameters include the preset operating frequency and the preset operating power, the preset condenser parameters include the first preset tube temperature, the preset evaporator parameters include the second preset tube temperature, the first compressor parameters include the detection operating power and the detection operating frequency, the first condenser parameters include the first detected tube temperature, and the first evaporator parameters include the first evaporator tube temperature.

[0068] Specifically, the first preset tube temperature indicates the preset condenser tube temperature, the first detected tube temperature indicates the actually detected condenser tube temperature, and the second preset tube temperature indicates the preset evaporator tube temperature. Figure 3 Indicates the correspondence table between the preset operating frequency, preset operating power, and the first preset tube temperature under the preset evaporator tube temperature of -5℃. Figure 4 Indicates the correspondence table between the preset operating frequency, preset operating power, and first preset pipe temperature at the preset evaporator pipe temperature of 0°C. By analogy, the compressor specification includes the correspondence table between the preset operating frequency, preset operating power, and first preset pipe temperature at different second preset pipe temperatures. Therefore, based on the correspondence between the preset operating frequency, preset operating power, first preset pipe temperature and second preset pipe temperature, the first evaporator pipe temperature corresponding to the detection operating frequency, detection operating power, and first detection pipe temperature can be determined.

[0069] For example, if the compressor's detection operating frequency f is 52 Hz and the first detection pipe temperature T is 46°C, and the detection operating power p is 3500 W, which is less than Figure 3 The preset evaporator tube temperature of -5°C corresponds to 3632W, so it is determined that the first evaporator tube temperature at this time is lower than -5°C.

[0070] If the detected operating power p is 3700W, greater than Figure 3 The preset evaporator tube temperature of -5℃ corresponds to 3632W, which is less than Figure 4 The preset evaporator tube temperature of 0℃ corresponds to 3753W, so it is considered that the first evaporator tube temperature is within -5℃~0℃.

[0071] If the detected operating power p is 3800W, greater than Figure 4 The preset evaporator tube temperature of 0℃ corresponds to 3753W, so it is considered that the first evaporator tube temperature is greater than 0℃ at this time.

[0072] The above method uses the interpolation method to quickly determine the comparison relationship between the first evaporator tube temperature and the first preset temperature (-5°C) and the second preset temperature (0°C), so as to estimate the first evaporator tube temperature. The first evaporator tube temperature can also be accurately determined by looking up the corresponding relationship table under different second preset tube temperatures.

[0073] In one embodiment, determining the frosting state of the evaporator in the indoor unit 120 according to the first compressor parameter and the first evaporator parameter corresponding to the first condenser parameter includes:

[0074] When the operation time of the compressor reaches a first preset time, obtaining the first evaporator tube temperature at different times within the first preset time, wherein the first evaporator parameter includes the first evaporator tube temperature;

[0075] When the duration of the first evaporator tube temperature being lower than the first preset temperature is greater than or equal to a second preset duration, determining that the frosting state of the evaporator in the indoor unit 120 indicates that the evaporator is frosted, wherein the second preset duration is less than the first preset duration; or

[0076] When the duration of the first evaporator tube temperature being lower than the first preset temperature within the second preset time is greater than or equal to the third preset time, and the first evaporator tube temperature does not exceed the second preset temperature within the second preset time, it is determined that the frosting state of the evaporator located in the indoor unit 120 indicates that the evaporator is frosted, wherein the third preset time is less than the second preset time, and the second preset temperature is greater than the first preset temperature; or,

[0077] When the first evaporator tube temperature does not exceed the second preset temperature within the first preset time period, it is determined that the frosting state of the evaporator in the indoor unit 120 indicates that the evaporator is frosted.

[0078] Specifically, the first preset time, the second preset time, and the third preset time can be customized according to the actual application scenario. In this embodiment, the first preset time is 12 minutes, the second preset time is 6 minutes, and the third preset time is 5 minutes. The first preset temperature and the second preset temperature can also be customized according to the actual application requirements. In this embodiment, the first preset temperature is -5°C and the second preset temperature is 0°C.

[0079] When the operation time of the compressor reaches 12 minutes, the first evaporator tube temperature determined at different times during this period of 12 minutes is obtained. The calculation method of each first evaporator tube temperature during this period refers to the previous embodiment, that is, the first compressor parameter and the first condenser parameter collected in real time by the outdoor unit 110 are used to determine the corresponding first evaporator tube temperature, which will not be repeated here. Based on the first evaporator tube temperature at different times within the first preset time, it is judged whether the evaporator meets the anti-freezing condition, that is, whether the frosting state of the evaporator is frosted. If at least one of the following is met, the frosting state of the evaporator is determined to be frosted:

[0080] 1. The first evaporator tube temperature is lower than -5℃ for more than or equal to 6 minutes, indicating that there is a lot of frost on the evaporator surface, resulting in a low evaporator tube temperature and a long period of low temperature;

[0081] 2. Within 6 minutes, the first evaporator tube temperature is lower than -5°C for a duration greater than or equal to 5 minutes, and the first evaporator tube temperature is not greater than 0°C, that is, the first evaporator tube temperature is always lower than 0°C, indicating that there is some frost on the evaporator surface, but the frost amount is less than the frost amount in the first case;

[0082] 3. Within 12 minutes, the temperature of the first evaporator tube did not exceed 0℃, that is, the temperature of the first evaporator tube was always below 0℃. Since the temperature of the first evaporator tube was not lower than -5℃, but also not greater than 0℃, it can be determined that there is a small amount of frost on the surface of the evaporator, and the amount of frost in this case is less than that in the second case.

[0083] Therefore, based on the above three judgment conditions, not only can it be used to trigger the anti-freeze mechanism, but also the amount of frost on the evaporator surface can be estimated, so that the anti-freeze mode of the compressor can be accurately controlled in combination with the amount of frost. In the case where the first evaporator tube temperature does not meet all of the above conditions within the first preset time, the frosting state of the evaporator is determined to be unfrosted. In this way, the outdoor unit 110 can judge the frosting state of the evaporator without communicating with the indoor unit 120.

[0084] In one embodiment, Figure 5 As shown, when the frosting state is frosted, controlling the compressor to operate at a reduced frequency according to the anti-freezing mode includes:

[0085] Step S241, when the frosting state is frosted, controlling the compressor to gradually reduce the frequency according to a preset frequency reduction step corresponding to a preset unit time.

[0086] Specifically, the preset unit time can be 1 minute, 2 minutes, 5 minutes, etc., and the preset frequency reduction step can be 1Hz, 2Hz, 4Hz, 5Hz, 10Hz, etc. When it is determined that the evaporator is frosted, the operating frequency of the compressor is gradually reduced according to the preset frequency reduction step corresponding to the preset unit time. For example, if the preset unit time is 2 minutes and the preset frequency reduction step is 4Hz, the compressor operating frequency is controlled to be reduced by 4Hz every 2 minutes, so that the compressor can be operated at a regular and gradual frequency reduction. By reducing the operating frequency of the compressor, the evaporator can be prevented from continuing to frost or freeze, and the frosting of the evaporator can be alleviated, so as to prevent the compressor from continuous liquid return of refrigerant due to frosting of the evaporator, thereby ensuring the operating reliability of the compressor.

[0087] In one embodiment, Figure 6 As shown, when the frosting state is frosted, after controlling the compressor to gradually reduce the frequency according to the preset frequency reduction step corresponding to the preset unit time, the method further includes:

[0088] Step S250, obtaining a second compressor parameter and a second condenser parameter, and determining a second evaporator parameter corresponding to the second compressor parameter and the second condenser parameter according to a correspondence relationship among the preset compressor parameter, the preset condenser parameter and the preset evaporator parameter, wherein the second evaporator parameter includes a second evaporator tube temperature;

[0089] Step S260, when the second evaporator tube temperature is greater than the second preset temperature and the detection operating frequency in the second compressor parameter is greater than the preset minimum frequency, control the compressor to continue to operate according to the current detection operating frequency; or,

[0090] Step S270, when the detected operating frequency in the second compressor parameter is equal to the preset minimum frequency, and the second evaporator tube temperature is less than or equal to the second preset temperature, control the compressor and the outdoor fan to stop running.

[0091] Specifically, after controlling the compressor to reduce the frequency according to the anti-freeze mode, the first compressor parameter and the first condenser parameter are continuously detected and the corresponding first evaporator tube temperature is determined. If the regained first evaporator tube temperature is greater than 0°C, and the regained detected operating frequency has not yet reached the preset minimum frequency, it means that the amount of frost on the evaporator surface has decreased before the compressor operating frequency is reduced to the preset minimum frequency, resulting in an increase in the evaporator tube temperature. The compressor is controlled to stop continuing to reduce the frequency and maintain the current operating frequency for continuous operation, so as to continue to operate at a low frequency to continuously alleviate the frost on the evaporator surface.

[0092] If the detected operating frequency obtained again is lower than the preset minimum frequency, but the first evaporator tube temperature is still less than or equal to 0°C, that is, the first evaporator tube temperature still cannot be greater than 0°C, indicating that the frosting of the evaporator cannot be alleviated by reducing the compressor operating frequency, the compressor and the outdoor fan are controlled to stop running, that is, the compressor and the outdoor fan are turned off to prevent the compressor from continuing to generate cooling capacity and causing the evaporator to continue to frost and freeze.

[0093] In one embodiment, Figure 7 As shown, when the second evaporator tube temperature is greater than the second preset temperature and the detection operating frequency in the second compressor parameter is greater than the preset minimum frequency, after controlling the compressor to continue to operate according to the current detection operating frequency, the method further includes:

[0094] Step S261, obtaining a third compressor parameter and a third condenser parameter, and determining a third evaporator parameter corresponding to the third compressor parameter and the third condenser parameter according to a correspondence relationship between the preset compressor parameter, the preset condenser parameter and the preset evaporator parameter, wherein the third evaporator parameter includes a third evaporator tube temperature;

[0095] Step S262, when the duration that the third evaporator tube temperature is greater than the second preset temperature exceeds the second preset time, controlling the compressor to exit the anti-freeze mode and operate in a normal working mode.

[0096] Specifically, when the second evaporator tube temperature rises above 0℃, the compressor is stopped from continuing to reduce the frequency. Instead, the compressor is controlled to maintain the operating frequency when the second evaporator tube temperature reaches 0℃ and continue to run, and the evaporator tube temperature is continuously monitored. If the duration of the re-acquired third evaporator tube temperature exceeding 0℃ exceeds the second preset time, it is deemed that the frost on the evaporator surface has been eliminated, and the anti-freeze mechanism can be exited, that is, the compressor is controlled to exit the anti-freeze mode and operate in the normal working mode. The operating frequency of the normal working mode is higher than the operating frequency of the anti-freeze mode, so that the compressor provides normal cooling capacity and restores normal cooling effect.

[0097] In one embodiment, Figure 8 As shown, when the detected operating frequency in the second compressor parameter is equal to the preset minimum frequency, and the second evaporator tube temperature is less than or equal to the second preset temperature, after controlling the compressor and the outdoor fan to stop running, the method further includes:

[0098] Step S271, when the stop time of the compressor reaches the fourth preset time, control the compressor and the outdoor fan to operate in a normal working mode, and execute the step of obtaining the first compressor parameter and the first condenser parameter when the outdoor unit 110 is in an operating state, until the frosting state is frosted, control the compressor to operate at a reduced frequency in an anti-freeze mode.

[0099] Specifically, after controlling the compressor and the outdoor fan to stop running, the stop time of the compressor and the outdoor fan is monitored in real time. When the stop time reaches a fourth preset time, the compressor and the outdoor fan are restarted. The fourth preset time may be the same as or different from the aforementioned first preset time, second preset time, and third preset time. In this embodiment, the fourth preset time is the same as the second preset time, that is, the fourth preset time is 6 minutes. When the stop time of the compressor and the outdoor fan reaches 6 minutes, the normal operation of the compressor and the outdoor fan is restored to avoid the compressor and the outdoor fan being stopped for too long and affecting the cooling effect of the air-conditioning equipment. After restoring the normal operation of the compressor and the outdoor fan, continue to perform anti-freeze logic judgment according to the above steps S210 to S250 to determine whether the frost on the surface of the evaporator is eliminated during the compressor shutdown stage. If not, continue to enter the anti-freeze mode to cyclically perform anti-freeze processing to prevent frost or freezing on the evaporator.

[0100] Figure 2 , Figures 5 to 8 FIG. 1 is a flow chart of an evaporator antifreeze method in one embodiment. It should be understood that although Figure 2 , Figures 5 to 8 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 2 , Figures 5 to 8 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0101] In one embodiment, Fig. 9 As shown, an evaporator anti-freezing device is provided, comprising:

[0102] The acquisition module 310 is used to acquire a first compressor parameter and a first condenser parameter when the outdoor unit 110 is in operation, wherein the outdoor unit 110 includes a compressor and a condenser;

[0103] A determination module 320, configured to determine the first evaporator parameter corresponding to the first compressor parameter and the first condenser parameter according to a correspondence relationship among the preset compressor parameter, the preset condenser parameter and the preset evaporator parameter;

[0104] A judgment module 330, configured to determine a frosting state of an evaporator located in the indoor unit 120 according to the first compressor parameter and a first evaporator parameter corresponding to the first condenser parameter, wherein there is no communication link between the outdoor unit 110 and the indoor unit 120;

[0105] The control module 340 is used to control the compressor to operate at a reduced frequency according to an anti-freezing mode when the frosting state is frosted.

[0106] In one embodiment, the determining module 320 is further configured to:

[0107] According to the correspondence between the preset operating frequency, the preset operating power, the first preset tube temperature and the second preset tube temperature, the first evaporator tube temperature corresponding to the detection operating frequency, the detection operating power and the first detected tube temperature is determined, wherein the preset compressor parameters include the preset operating frequency and the preset operating power, the preset condenser parameters include the first preset tube temperature, the preset evaporator parameters include the second preset tube temperature, the first compressor parameters include the detection operating power and the detection operating frequency, the first condenser parameters include the first detected tube temperature, and the first evaporator parameters include the first evaporator tube temperature.

[0108] In one embodiment, the determination module 330 is further configured to:

[0109] When the operation time of the compressor reaches a first preset time, obtaining the first evaporator tube temperature at different times within the first preset time, wherein the first evaporator parameter includes the first evaporator tube temperature;

[0110] When the duration of the first evaporator tube temperature being lower than the first preset temperature is greater than or equal to a second preset duration, determining that the frosting state of the evaporator in the indoor unit 120 indicates that the evaporator is frosted, wherein the second preset duration is less than the first preset duration; or

[0111] When the duration of the first evaporator tube temperature being lower than the first preset temperature within the second preset time is greater than or equal to the third preset time, and the first evaporator tube temperature does not exceed the second preset temperature within the second preset time, it is determined that the frosting state of the evaporator located in the indoor unit 120 indicates that the evaporator is frosted, wherein the third preset time is less than the second preset time, and the second preset temperature is greater than the first preset temperature; or,

[0112] When the first evaporator tube temperature does not exceed the second preset temperature within the first preset time period, it is determined that the frosting state of the evaporator in the indoor unit 120 indicates that the evaporator is frosted.

[0113] In one embodiment, the control module 340 is further configured to:

[0114] When the frosting state is frosted, the compressor is controlled to gradually reduce the frequency according to a preset frequency reduction step corresponding to a preset unit time.

[0115] In one embodiment, the control module 340 is further configured to:

[0116] Acquire a second compressor parameter and a second condenser parameter, and determine a second evaporator parameter corresponding to the second compressor parameter and the second condenser parameter according to a correspondence relationship between the preset compressor parameter, the preset condenser parameter and the preset evaporator parameter, wherein the second evaporator parameter includes a second evaporator tube temperature;

[0117] When the second evaporator tube temperature is greater than a second preset temperature and the detection operating frequency in the second compressor parameter is greater than a preset minimum frequency, controlling the compressor to continue operating at the current detection operating frequency; or,

[0118] When the detected operating frequency in the second compressor parameter is equal to the preset minimum frequency and the second evaporator tube temperature is less than or equal to the second preset temperature, the compressor and the outdoor fan are controlled to stop running.

[0119] In one embodiment, the control module 340 is further configured to:

[0120] Acquire a second compressor parameter and a second condenser parameter, and determine a second evaporator parameter corresponding to the second compressor parameter and the second condenser parameter according to a correspondence relationship between the preset compressor parameter, the preset condenser parameter and the preset evaporator parameter, wherein the second evaporator parameter includes a second evaporator tube temperature;

[0121] When the duration that the third evaporator tube temperature is greater than the second preset temperature exceeds the second preset time, the compressor is controlled to exit the anti-freezing mode and operate in a normal working mode.

[0122] In one embodiment, the control module 340 is further configured to:

[0123] When the stop time of the compressor reaches the fourth preset time, the compressor and the outdoor fan are controlled to operate in a normal working mode, and the step of obtaining the first compressor parameter and the first condenser parameter when the outdoor unit 110 is in an operating state is executed, until the frosting state is frosted, the compressor is controlled to operate at a reduced frequency in an anti-freeze mode.

[0124] like Fig.10 As shown, an embodiment of the present application provides an air conditioning device, including a processor 711, a communication interface 712, a memory 713 and a communication bus 714, wherein the processor 711, the communication interface 712, and the memory 713 communicate with each other through the communication bus 714;

[0125] Memory 713, used for storing computer programs;

[0126] The processor 711 is used to implement the evaporator anti-freezing method provided by any one of the aforementioned method embodiments when executing the program stored in the memory 713.

[0127] Those skilled in the art will understand that Fig.10 The structure shown in the figure is only a block diagram of a part of the structure related to the scheme of the present application, and does not constitute a limitation on the air-conditioning equipment to which the scheme of the present application is applied. The specific air-conditioning equipment may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0128] In one embodiment, the evaporator antifreeze device provided in the present application can be implemented in the form of a computer program. The computer program can be Fig.10 The memory of the air conditioning device can store various program modules constituting the evaporator antifreeze device, for example, Fig. 9 The acquisition module 310, determination module 320, judgment module 330 and control module 340 are shown. The computer program composed of various program modules enables the processor to execute the evaporator anti-freezing method of various embodiments of the present application described in this specification.

[0129] Fig.10 The air conditioning equipment shown can be Fig. 9The acquisition module 310 in the evaporator anti-freezing device shown in the figure acquires the first compressor parameter and the first condenser parameter when the outdoor unit 110 is in the running state, wherein the outdoor unit 110 includes a compressor and a condenser. The air-conditioning device can determine the first evaporator parameter corresponding to the first compressor parameter and the first condenser parameter according to the correspondence between the preset compressor parameter, the preset condenser parameter and the preset evaporator parameter through the determination module 320. The air-conditioning device can determine the frosting state of the evaporator located in the indoor unit 120 according to the first evaporator parameter corresponding to the first compressor parameter and the first condenser parameter through the judgment module 330, wherein there is no communication link between the outdoor unit 110 and the indoor unit 120. The air-conditioning device can control the compressor to reduce the frequency according to the anti-freezing mode when the frosting state is frosted through the control module 340.

[0130] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the evaporator anti-freezing method provided by any one of the aforementioned method embodiments is implemented.

[0131] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0132] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a general hardware platform, and of course, by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the relevant technology can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for enabling an air-conditioning device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiment.

[0133] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative can be used.

[0134] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An evaporator antifreeze method, characterized in that: The method comprises: When the outdoor unit is in operation, obtaining a first compressor parameter and a first condenser parameter, wherein the outdoor unit includes a compressor and a condenser; Determining the first evaporator parameter corresponding to the first compressor parameter and the first condenser parameter according to the correspondence between the preset compressor parameter, the preset condenser parameter and the preset evaporator parameter; determining a frosting state of an evaporator located in an indoor unit according to the first compressor parameter and a first evaporator parameter corresponding to the first condenser parameter, wherein there is no communication link between the outdoor unit and the indoor unit; When the frosting state is frosted, the compressor is controlled to operate at a reduced frequency according to an anti-freezing mode.

2. The method according to claim 1, characterized in that The determining, according to the correspondence between the preset compressor parameter, the preset condenser parameter and the preset evaporator parameter, the first evaporator parameter corresponding to the first compressor parameter and the first condenser parameter comprises: According to the correspondence between the preset operating frequency, the preset operating power, the first preset tube temperature and the second preset tube temperature, the first evaporator tube temperature corresponding to the detection operating frequency, the detection operating power and the first detected tube temperature is determined, wherein the preset compressor parameters include the preset operating frequency and the preset operating power, the preset condenser parameters include the first preset tube temperature, the preset evaporator parameters include the second preset tube temperature, the first compressor parameters include the detection operating power and the detection operating frequency, the first condenser parameters include the first detected tube temperature, and the first evaporator parameters include the first evaporator tube temperature.

3. The method according to claim 1, characterized in that The step of determining the frosting state of the evaporator in the indoor unit according to the first compressor parameter and the first evaporator parameter corresponding to the first condenser parameter includes: When the operation time of the compressor reaches a first preset time, obtaining the first evaporator tube temperature at different times within the first preset time, wherein the first evaporator parameter includes the first evaporator tube temperature; When the duration of the first evaporator tube temperature being lower than the first preset temperature is greater than or equal to a second preset duration, determining that the frosting state of the evaporator in the indoor unit indicates that the evaporator is frosted, wherein the second preset duration is less than the first preset duration; or When the duration of the first evaporator tube temperature being lower than the first preset temperature within the second preset time is greater than or equal to the third preset time, and the first evaporator tube temperature does not exceed the second preset temperature within the second preset time, it is determined that the frosting state of the evaporator located in the indoor unit indicates that the evaporator is frosted, wherein the third preset time is less than the second preset time, and the second preset temperature is greater than the first preset temperature; or, When the first evaporator tube temperature does not exceed the second preset temperature within the first preset time period, determining that the frosting state of the evaporator located in the indoor unit indicates that the evaporator is frosted.

4. The method according to claim 2, characterized in that: When the frosting state is frosted, controlling the compressor to operate at a reduced frequency according to an anti-freezing mode includes: When the frosting state is frosted, the compressor is controlled to gradually reduce the frequency according to a preset frequency reduction step corresponding to a preset unit time.

5. The method according to claim 4, characterized in that When the frosting state is frosted, after controlling the compressor to gradually reduce the frequency according to a preset frequency reduction step corresponding to a preset unit time, the method further includes: Acquire a second compressor parameter and a second condenser parameter, and determine a second evaporator parameter corresponding to the second compressor parameter and the second condenser parameter according to a correspondence relationship between the preset compressor parameter, the preset condenser parameter and the preset evaporator parameter, wherein the second evaporator parameter includes a second evaporator tube temperature; When the second evaporator tube temperature is greater than a second preset temperature and the detection operating frequency in the second compressor parameter is greater than a preset minimum frequency, controlling the compressor to continue operating at the current detection operating frequency; or, When the detected operating frequency in the second compressor parameter is equal to the preset minimum frequency and the second evaporator tube temperature is less than or equal to the second preset temperature, the compressor and the outdoor fan are controlled to stop running.

6. The method according to claim 5, characterized in that When the second evaporator tube temperature is greater than the second preset temperature and the detection operating frequency in the second compressor parameter is greater than the preset minimum frequency, after controlling the compressor to continue to operate according to the current detection operating frequency, the method further includes: Acquire a third compressor parameter and a third condenser parameter, and determine a third evaporator parameter corresponding to the third compressor parameter and the third condenser parameter according to a correspondence relationship between the preset compressor parameter, the preset condenser parameter and the preset evaporator parameter, wherein the third evaporator parameter includes a third evaporator tube temperature; When the duration that the third evaporator tube temperature is greater than the second preset temperature exceeds the second preset time, the compressor is controlled to exit the anti-freezing mode and operate in a normal working mode.

7. The method according to claim 5, characterized in that When the detected operating frequency in the second compressor parameter is equal to the preset minimum frequency and the second evaporator tube temperature is less than or equal to the second preset temperature, after controlling the compressor and the outdoor fan to stop running, the method further includes: When the stop time of the compressor reaches a fourth preset time, the compressor and the outdoor fan are controlled to operate in a normal working mode, and the step of obtaining the first compressor parameter and the first condenser parameter when the outdoor unit is in an operating state is executed, until the frosting state is frosted, the compressor is controlled to operate at a reduced frequency in an anti-freeze mode.

8. An evaporator antifreeze device, characterized in that: The device comprises: An acquisition module, used for acquiring a first compressor parameter and a first condenser parameter when the outdoor unit is in operation, wherein the outdoor unit includes a compressor and a condenser; A determination module, configured to determine the first evaporator parameter corresponding to the first compressor parameter and the first condenser parameter according to a correspondence relationship among the preset compressor parameter, the preset condenser parameter and the preset evaporator parameter; a judgment module, configured to determine a frosting state of an evaporator located in an indoor unit according to the first compressor parameter and a first evaporator parameter corresponding to the first condenser parameter, wherein there is no communication link between the outdoor unit and the indoor unit; The control module is used to control the compressor to operate at a reduced frequency according to an anti-freezing mode when the frosting state is frosted.

9. An outdoor unit, characterized in that: The outdoor unit includes a compressor, a variable frequency drive for driving the compressor, an outdoor fan, a condenser, a temperature sensor arranged on the condenser, and a controller, and the controller includes the evaporator anti-freezing device as claimed in claim 8.

10. An air conditioning device, characterized in that: The air conditioning device includes an indoor unit of any model and an outdoor unit as claimed in claim 9, and there is no communication link between the outdoor unit and the indoor unit.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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