Anti-freezing control method and device and air conditioner

Abstract

The invention provides an anti-freezing control method and device and an air conditioner. According to the method, the outdoor environment temperature, the indoor unit pipe temperature and the outdoor unit pipe temperature are obtained, and the indoor unit pipe temperature change rate and the outdoor unit pipe temperature change rate are calculated correspondingly to intelligently adjust one or more of the compressor frequency, the outer fan rotating speed and the electronic expansion opening degree; the pipe temperature of the indoor unit is maintained in a non-freezing temperature area, freezing of an evaporator of the indoor unit is avoided, frequent anti-freezing protection shutdown is avoided, and reliability and comfort of operation of the whole machine are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioner antifreeze, and in particular to an antifreeze control method, device and air conditioner. Background Art

[0002] The air conditioner runs at high frequency and for a long time under low-temperature refrigeration conditions. After the evaporator is frosted, it does not enter the anti-freeze protection in time, which causes the wind field of the indoor unit to change and the evaporator to freeze, affecting the refrigeration effect. Moreover, the air conditioner is running at low-temperature refrigeration and frequently enters the anti-freeze protection, resulting in poor refrigeration effect and unable to meet the user's requirements for the air outlet temperature. At the same time, it frequently enters the protection and the compressor is frequently started and stopped, affecting the service life of the compressor.

[0003] Related technologies propose a method and air conditioner to prevent evaporator frost, and propose a method to prevent evaporator anti-freezing by obtaining the condenser outer disk temperature and the compressor refrigeration continuous operation time to determine whether the compressor needs to be stopped. This solution has too few judgment conditions and is not accurate enough. There is a possibility of frequent protection shutdown, and the processing method is relatively simple. Only stopping the compressor will cause excessive temperature fluctuations and affect user experience.

[0004] Related technologies have proposed a method and device for controlling the cooling operation of an air conditioner, and proposed to solve the problem of icing of the indoor evaporator by obtaining the continuous operation time of the compressor and the real-time pipe temperature of the indoor evaporator to determine whether the frequency needs to be reduced or the compressor needs to be stopped. The processing method of this solution is still not rich enough, the judgment conditions are too few, and the accuracy and reliability are insufficient.

[0005] The related technology proposes an air conditioner and its anti-freeze control method, device, computer equipment and storage medium, and proposes using the temperature change rate to determine whether it is necessary to enter anti-freeze protection. The judgment method is good and the accuracy is high, but the processing means are insufficient and it is easy to enter the anti-freeze protection processing mode frequently. Summary of the invention

[0006] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and provide an anti-freeze control method, device and air conditioner to solve the problem in the related art that the air conditioner is prone to frequently enter the anti-freeze protection shutdown mode due to the low internal pipe temperature and evaporator freezing under low-temperature refrigeration conditions.

[0007] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0008] According to a first aspect of the present invention, there is provided an anti-freezing control method, comprising:

[0009] Get the outdoor ambient temperature, the internal pipe temperature and the external pipe temperature;

[0010] Calculating the change rate of the internal unit tube temperature according to the internal unit tube temperature, and calculating the change rate of the external unit tube temperature according to the external unit tube temperature;

[0011] According to the inner unit pipe temperature, the outer unit pipe temperature, the inner unit pipe temperature change rate and the outer unit pipe temperature change rate, one or more of the compressor frequency, the outer fan speed and the electronic expansion opening are adjusted to maintain the inner unit pipe temperature in a non-freezing temperature zone to avoid freezing of the inner unit evaporator.

[0012] Preferably, the obtaining of the outdoor ambient temperature, the internal unit pipe temperature and the external unit pipe temperature includes:

[0013] When the unit is started, first obtain the current outdoor ambient temperature of the unit;

[0014] When the outdoor ambient temperature is lower than the preset outdoor ambient temperature, it enters the low-temperature cooling mode;

[0015] In low-temperature cooling mode, the internal and external pipe temperatures are obtained in real time.

[0016] Preferably, adjusting one or more of the compressor frequency, the external fan speed, and the electronic expansion opening according to the internal unit tube temperature, the external unit tube temperature, the internal unit tube temperature change rate, and the external unit tube temperature change rate includes:

[0017] Determine whether the internal machine pipe temperature is between a first internal machine pipe temperature preset value and a second internal machine pipe temperature preset value, and if so, obtain an external fan speed adjustment value by querying an external fan speed adjustment control table, and execute an external fan speed adjustment strategy according to the external fan speed adjustment value;

[0018] The external fan speed adjustment control table stores different internal unit tube temperature change rate intervals and external fan speed adjustment values ​​corresponding to different external unit tube temperature change rate intervals.

[0019] Preferably, the external fan speed adjustment control table is obtained by the following steps, including:

[0020] Set N preset values ​​of internal machine tube temperature change rates to obtain N+1 internal machine tube temperature change rate intervals;

[0021] Set N preset values ​​of the external unit tube temperature change rate to obtain N+1 external unit tube temperature change rate intervals;

[0022] The N+1 internal unit pipe temperature change rate intervals are used as the vertical table header, and the N+1 external unit pipe temperature change rate intervals are used as the horizontal table header to establish a blank external fan speed adjustment control table, where N is a positive integer;

[0023] The external fan speed adjustment value corresponding to each cell is determined, and the determined external fan speed adjustment value is stored in the external fan speed adjustment control table.

[0024] Preferably, executing the external fan speed adjustment strategy according to the external fan speed adjustment value includes:

[0025] Determine the target speed of the external fan = the current speed of the external fan + the speed adjustment value of the external fan;

[0026] The external fan is controlled to run at the target speed of the external fan.

[0027] Preferably, the method further comprises:

[0028] If the target speed of the external fan is greater than the maximum speed threshold of the external fan, the external fan is controlled to operate according to the maximum speed threshold of the external fan;

[0029] If the target speed of the external fan is less than or equal to zero, the external fan is controlled to stop running.

[0030] Preferably, the method further comprises:

[0031] If the internal unit pipe temperature is not between the first internal unit pipe temperature preset value and the second internal unit pipe temperature preset value, but between the third internal unit pipe temperature preset value and the second pipe temperature preset value, stop the operation of the external fan; the third internal unit pipe temperature preset value < the second internal unit pipe temperature preset value < the first internal unit pipe temperature preset value;

[0032] When the internal machine pipe temperature change rate V 内管 ≥Preset value of the third internal unit pipe temperature change rate V 内3 When the compressor frequency is increased, it is prohibited to increase the frequency;

[0033] When the second internal machine pipe temperature change rate preset value V 内2 ≤V 内管 <V 内3 , control the compressor to start slow frequency reduction at the first frequency reduction speed;

[0034] When V 内管 <V 内2 When the compressor is controlled to start fast reduction at the second frequency reduction speed until it drops to the lower limit value; wherein the second frequency reduction speed is greater than the first frequency reduction speed.

[0035] Preferably, the method further comprises:

[0036] If the internal machine pipe temperature is lower than the third internal machine pipe temperature preset value, the external fan is stopped and the compressor frequency is controlled to drop to the lower limit value;

[0037] If V 内管 <V 内3 , control the electronic expansion valve to open at the rapid opening speed, and start the rapid opening timing;

[0038] If the timing reaches the preset time, there is still V 内管 <V 内3, the whole machine enters anti-freeze protection and the compressor stops.

[0039] According to a second aspect of the present invention, there is provided an anti-freezing control device, comprising:

[0040] Acquisition module, used to obtain outdoor ambient temperature, internal unit pipe temperature and external unit pipe temperature;

[0041] A calculation module, used to calculate the change rate of the internal unit tube temperature according to the internal unit tube temperature, and to calculate the change rate of the external unit tube temperature according to the external unit tube temperature;

[0042] The control module is used to adjust one or more of the compressor frequency, the external fan speed, and the electronic expansion opening according to the internal unit pipe temperature, the external unit pipe temperature, the internal unit pipe temperature change rate, and the external unit pipe temperature change rate, so as to maintain the internal unit pipe temperature in a non-freezing temperature zone to avoid freezing of the internal unit evaporator.

[0043] According to a third aspect of the present invention, there is provided an air conditioner, comprising:

[0044] A processor, and a memory connected to the processor;

[0045] The memory is used to store computer programs;

[0046] The processor is used to call and execute the computer program in the memory to perform the above method.

[0047] Preferably, the air conditioner comprises: a variable frequency cooling and heating wall-mounted unit.

[0048] The technical solution provided by the embodiments of the present invention may have the following beneficial effects:

[0049] By obtaining the outdoor ambient temperature, the indoor unit pipe temperature and the outdoor unit pipe temperature and calculating the indoor unit pipe temperature change rate and the outdoor unit pipe temperature change rate respectively, the compressor frequency, the outdoor fan speed and the electronic expansion opening are intelligently adjusted to maintain the indoor unit pipe temperature in the non-freezing temperature zone, avoid freezing of the indoor unit evaporator and avoid frequent anti-freeze protection shutdown, so as to ensure the reliability and comfort of the whole machine operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 is a flow chart showing an anti-freezing control method according to an exemplary embodiment;

[0051] Figure 2 is a schematic block diagram of an anti-freezing control device according to an exemplary embodiment. DETAILED DESCRIPTION

[0052] In order to enable those skilled in the art to better understand the solution of the present application, 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 only 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 creative work should fall within the scope of protection of the present application.

[0053] For ease of understanding, in the following embodiments, the parameters are described as follows:

[0054] The first internal machine pipe temperature preset value 1 - unit: ℃

[0055] The second internal machine pipe temperature preset value 2 - unit: ℃

[0056] The third internal machine pipe temperature preset value 3 - unit: ℃

[0057] Outdoor ambient temperature——T 外环 (Unit: °C)

[0058] Internal machine pipe temperature——T 内管 (Unit: °C)

[0059] External unit pipe temperature——T 外管 (Unit: °C)

[0060] Internal machine tube temperature change rate——V 内管 (Unit: °C / min)

[0061] External unit pipe temperature change rate——V 外管 (Unit: °C / min)

[0062] External fan speed adjustment value——△R ij (Unit: rpm - revolutions per minute; i is 1, 2, 3, 4, 5; j is 1, 2, 3, 4, 5)

[0063] Preset value of temperature change rate of the kth internal machine pipe——V 内k (Unit: ℃ / min; k is 1, 2, 3, 4)

[0064] Preset value of temperature change rate of the mth external unit pipe——V 外m (Unit: ℃ / min; m can be 1, 2, 3, 4)

[0065] Embodiment 1

[0066] Figure 1 is a flow chart of an anti-freezing control method according to an exemplary embodiment. Figure 1 , the method comprising:

[0067] Step S11, obtaining the outdoor ambient temperature, the internal unit pipe temperature and the external unit pipe temperature;

[0068] Step S12, calculating the change rate of the internal unit tube temperature according to the internal unit tube temperature, and calculating the change rate of the external unit tube temperature according to the external unit tube temperature;

[0069] Step S13, according to the inner unit tube temperature, the outer unit tube temperature, the inner unit tube temperature change rate, and the outer unit tube temperature change rate, adjust one or more of the compressor frequency, the outer fan speed, and the electronic expansion opening to maintain the inner unit tube temperature in a non-freezing temperature zone to avoid freezing of the inner unit evaporator.

[0070] It should be noted that, in specific practice, the technical solution provided in this embodiment is loaded into the controller of the air conditioner and runs.

[0071] It can be understood that the technical solution provided in this embodiment obtains the outdoor ambient temperature, the indoor unit pipe temperature and the outdoor unit pipe temperature and calculates the indoor unit pipe temperature change rate and the outdoor unit pipe temperature change rate respectively to intelligently adjust one or more of the compressor frequency, the outdoor fan speed and the electronic expansion opening, so as to maintain the indoor unit pipe temperature in the non-freezing temperature zone, avoid freezing of the indoor unit evaporator, avoid frequent anti-freeze protection shutdown, and ensure the reliability and comfort of the whole machine operation.

[0072] In specific practice, obtaining the outdoor environment temperature, the indoor unit pipe temperature and the outdoor unit pipe temperature in step S11 includes:

[0073] When the unit is started, first obtain the current outdoor ambient temperature of the unit;

[0074] When the outdoor ambient temperature is lower than the preset outdoor ambient temperature, it enters the low-temperature cooling mode;

[0075] In low-temperature cooling mode, the internal and external pipe temperatures are obtained in real time.

[0076] It should be noted that the preset value of the outdoor ambient temperature is set according to historical experience values ​​or experimental data. For example, the preset value of the outdoor ambient temperature is 15°C.

[0077] It is understandable that when the air conditioner is cooling at low temperatures, it is easy for the inner pipe to drop to the freezing zone, causing the indoor evaporator to freeze. Therefore, the outdoor ambient temperature is used as a benchmark to determine whether to enter the low-temperature cooling mode, and the inner pipe temperature is used as a benchmark to decide which load to control (external fan, compressor, electronic expansion valve).

[0078] In specific practice, in step S13, one or more of the compressor frequency, the external fan speed, and the electronic expansion opening are adjusted according to the internal unit tube temperature, the external unit tube temperature, the internal unit tube temperature change rate, and the external unit tube temperature change rate, including:

[0079] Determine whether the internal machine pipe temperature is between a first internal machine pipe temperature preset value and a second internal machine pipe temperature preset value, and if so, obtain an external fan speed adjustment value by querying an external fan speed adjustment control table, and execute an external fan speed adjustment strategy according to the external fan speed adjustment value;

[0080] The external fan speed adjustment control table stores different internal unit tube temperature change rate intervals and external fan speed adjustment values ​​corresponding to different external unit tube temperature change rate intervals.

[0081] It should be noted that the first internal machine tube temperature preset value and the second internal machine tube temperature preset value are set according to historical experience values ​​or experimental data. For example, the first internal machine tube temperature preset value 1 is generally 12°C, and the second internal machine tube temperature preset value 2 is generally 5°C. The specific parameters are determined by experiments, and different values ​​are taken for different models.

[0082] It is understandable that when the inner tube temperature is between the first inner tube temperature preset value 1 and the second inner tube temperature preset value 2, the inner tube temperature is far from the freezing temperature zone, but can also meet the outlet air temperature. The outer fan speed is adjusted based on the inner tube temperature change rate and the outer tube temperature change rate to change the heat exchange effect of the whole system. For example, when the inner tube temperature drops rapidly and the outer tube temperature rises slowly, it means that the heat exchange effect is too good, and the fan speed will be adjusted down to reduce the heat exchange effect and maintain the inner tube temperature; on the contrary, it means that the heat exchange effect is too poor, and the fan speed will be adjusted up to improve the heat exchange effect and maintain the inner tube temperature. Through this adjustment method, the inner tube temperature is maintained in this range for a long time.

[0083] In specific practice, the external fan speed adjustment control table is obtained through the following steps, including:

[0084] Set N preset values ​​of internal machine tube temperature change rates to obtain N+1 internal machine tube temperature change rate intervals;

[0085] Set N preset values ​​of the external unit tube temperature change rate to obtain N+1 external unit tube temperature change rate intervals;

[0086] The N+1 internal unit pipe temperature change rate intervals are used as the vertical table header, and the N+1 external unit pipe temperature change rate intervals are used as the horizontal table header to establish a blank external fan speed adjustment control table, where N is a positive integer;

[0087] The external fan speed adjustment value corresponding to each cell is determined, and the determined external fan speed adjustment value is stored in the external fan speed adjustment control table.

[0088] Assuming that N is 4, a speed adjustment control table for an external fan can be shown in Table 1 below:

[0089] Table 1

[0090] Table lookup method: Calculate the temperature change value V according to the internal and external pipe temperatures obtained in step S11. 外管 and V 内管 , V 内管 and V 外管 Respectively with the preset value of the internal machine pipe temperature change rate (V 内1 , V 内2 , V 内3 , V 内4 ), external unit pipe temperature change rate preset value (V 外1 , V 外2 , V 外3 , V 外4 ) to determine their respective intervals, and then look up the table to determine the external fan speed adjustment value △Rij.

[0091] Specifically, executing the external fan speed adjustment strategy according to the external fan speed adjustment value includes:

[0092] Determine the target speed of the external fan = the current speed of the external fan + the speed adjustment value of the external fan;

[0093] The external fan is controlled to run at the target speed of the external fan.

[0094] It can be understood that the external fan speed adjustment value △Rij obtained by looking up the table can be greater than 0, less than 0, or equal to 0, but the external fan target speed must not be greater than the fan maximum speed and must not be less than 0. When the fan target speed is 0, the external fan is stopped.

[0095] Therefore, the method further comprises:

[0096] If the target speed of the external fan is greater than the maximum speed threshold of the external fan, the external fan is controlled to operate according to the maximum speed threshold of the external fan;

[0097] If the target speed of the external fan is less than or equal to zero, the external fan is controlled to stop running.

[0098] In specific practice, in step S13, one or more of the compressor frequency, the external fan speed, and the electronic expansion opening are adjusted according to the internal unit pipe temperature, the external unit pipe temperature, the internal unit pipe temperature change rate, and the external unit pipe temperature change rate, and the step also includes:

[0099] If the internal unit pipe temperature is not between the first internal unit pipe temperature preset value and the second internal unit pipe temperature preset value, but between the third internal unit pipe temperature preset value and the second pipe temperature preset value, stop the operation of the external fan; the third internal unit pipe temperature preset value < the second internal unit pipe temperature preset value < the first internal unit pipe temperature preset value;

[0100] When the internal machine pipe temperature change rate V 内管 ≥Preset value of the third internal unit pipe temperature change rate V 内3When the compressor frequency is increased, it is prohibited to increase the frequency;

[0101] When the second internal machine pipe temperature change rate preset value V 内2 ≤V 内管 <V 内3 , control the compressor to start slow frequency reduction at the first frequency reduction speed;

[0102] When V 内管 <V 内2 When the compressor is controlled to start fast reduction at the second frequency reduction speed until it drops to the lower limit value; wherein the second frequency reduction speed is greater than the first frequency reduction speed.

[0103] It should be noted that the third internal machine pipe temperature preset value 3 is generally 1°C, the first frequency reduction speed 1 is generally 1Hz / min, and the second frequency reduction speed 2 is generally 10Hz / min. The above values ​​are determined by experiments and different models have different values.

[0104] It can be understood that when the inner tube temperature is between the second inner tube temperature preset value 2 and the third inner tube temperature preset value 3, the inner tube temperature is close to the freezing temperature zone, and the external fan is stopped; and based on the inner tube temperature change rate, the compressor is determined to prohibit frequency increase, slow decrease, and fast decrease to reduce the heat exchange effect; prevent the inner tube temperature from continuing to drop, and maintain the inner tube temperature in the non-freezing temperature zone.

[0105] In specific practice, in step S13, one or more of the compressor frequency, the external fan speed, and the electronic expansion opening are adjusted according to the internal unit pipe temperature, the external unit pipe temperature, the internal unit pipe temperature change rate, and the external unit pipe temperature change rate, and the step also includes:

[0106] If the internal machine pipe temperature is lower than the third internal machine pipe temperature preset value, the external fan is stopped and the compressor frequency is controlled to drop to the lower limit value;

[0107] If V 内管 <V 内3 , control the electronic expansion valve to open at the rapid opening speed, and start the rapid opening timing;

[0108] If the timing reaches the preset time, there is still V 内管 <V 内3 , the whole machine enters anti-freeze protection and the compressor stops.

[0109] It should be noted that the emergency opening speed is generally 15p / 20s, which is determined by experiments and has different values ​​for different models.

[0110] It can be understood that when the inner tube temperature is lower than the third inner tube temperature preset value 3, the inner tube temperature has entered the freezing temperature zone, the external fan is stopped, the compressor frequency is reduced to the lower limit, and the inner tube temperature change rate is used as a reference to decide whether to open the electronic expansion valve urgently. If the inner tube temperature cannot rise after the electronic expansion valve is opened urgently, the anti-freeze protection is entered.

[0111] In summary, the technical solution provided in this embodiment obtains the outdoor ambient temperature, the indoor unit pipe temperature and the outdoor unit pipe temperature and calculates the indoor unit pipe temperature change rate and the outdoor unit pipe temperature change rate respectively to intelligently adjust one or more of the compressor frequency, the outdoor fan speed and the electronic expansion opening, so that the indoor unit pipe temperature is maintained in the non-freezing temperature zone, the indoor unit evaporator is avoided from freezing, and the anti-freeze protection shutdown is avoided frequently, so as to ensure the reliability and comfort of the whole machine operation.

[0112] In addition, the technical solution provided by this embodiment has a simple and easy-to-operate control method. By monitoring multiple parameters (outdoor ambient temperature, internal machine pipe temperature and external machine pipe temperature, and calculating the change rate of internal and external machine pipe temperature), the compressor frequency, external fan speed, electronic expansion opening and other loads are adjusted. The control accuracy is high and the user experience is good.

[0113] Embodiment 2

[0114] Figure 2 is a schematic block diagram of an anti-freezing control device 100 according to an exemplary embodiment. Figure 2 , the device 100 comprises:

[0115] The acquisition module 101 is used to acquire the outdoor environment temperature, the internal unit pipe temperature and the external unit pipe temperature;

[0116] A calculation module 102, configured to calculate a change rate of an inner unit tube temperature according to the inner unit tube temperature, and to calculate a change rate of an outer unit tube temperature according to the outer unit tube temperature;

[0117] The control module 103 is used to adjust one or more of the compressor frequency, the external fan speed, and the electronic expansion opening according to the internal unit pipe temperature, the external unit pipe temperature, the internal unit pipe temperature change rate, and the external unit pipe temperature change rate, so as to maintain the internal unit pipe temperature in a non-freezing temperature zone to avoid freezing of the internal unit evaporator.

[0118] It can be understood that the technical solution provided in this embodiment obtains the outdoor ambient temperature, the indoor unit pipe temperature and the outdoor unit pipe temperature and calculates the indoor unit pipe temperature change rate and the outdoor unit pipe temperature change rate respectively to intelligently adjust one or more of the compressor frequency, the outdoor fan speed and the electronic expansion opening, so as to maintain the indoor unit pipe temperature in the non-freezing temperature zone, avoid freezing of the indoor unit evaporator, avoid frequent anti-freeze protection shutdown, and ensure the reliability and comfort of the whole machine operation.

[0119] Embodiment 3

[0120] According to an exemplary embodiment, an air conditioner is shown, comprising:

[0121] A processor, and a memory connected to the processor;

[0122] The memory is used to store computer programs;

[0123] The processor is used to call and execute the computer program in the memory to perform the above method.

[0124] Preferably, the air conditioner comprises: a variable frequency cooling and heating wall-mounted unit.

[0125] It can be understood that the technical solution provided in this embodiment obtains the outdoor ambient temperature, the indoor unit pipe temperature and the outdoor unit pipe temperature and calculates the indoor unit pipe temperature change rate and the outdoor unit pipe temperature change rate respectively to intelligently adjust one or more of the compressor frequency, the outdoor fan speed and the electronic expansion opening, so as to maintain the indoor unit pipe temperature in the non-freezing temperature zone, avoid freezing of the indoor unit evaporator, avoid frequent anti-freeze protection shutdown, and ensure the reliability and comfort of the whole machine operation.

[0126] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0127] If the integrated units in the above embodiments are implemented in the form of software functional units and sold or used as independent products, they can be stored in the above computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling one or more computer devices (which may be personal computers, servers, or network devices, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application.

[0128] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0129] In the several embodiments provided in the present application, it should be understood that the disclosed client can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0130] 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 units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0131] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0132] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. An anti-freezing control method, characterized in that: include: Get the outdoor ambient temperature, the internal pipe temperature and the external pipe temperature; Calculating the change rate of the internal unit tube temperature according to the internal unit tube temperature, and calculating the change rate of the external unit tube temperature according to the external unit tube temperature; According to the inner unit pipe temperature, the outer unit pipe temperature, the inner unit pipe temperature change rate and the outer unit pipe temperature change rate, one or more of the compressor frequency, the outer fan speed and the electronic expansion opening are adjusted to maintain the inner unit pipe temperature in a non-freezing temperature zone to avoid freezing of the inner unit evaporator.

2. The method according to claim 1, characterized in that The obtaining of the outdoor environment temperature, the internal unit pipe temperature and the external unit pipe temperature includes: When the unit is started, first obtain the current outdoor ambient temperature of the unit; When the outdoor ambient temperature is lower than the preset outdoor ambient temperature, it enters the low-temperature cooling mode; In low-temperature cooling mode, the internal and external pipe temperatures are obtained in real time.

3. The method according to claim 2, characterized in that The adjusting one or more of the compressor frequency, the external fan speed, and the electronic expansion opening according to the internal unit tube temperature, the external unit tube temperature, the internal unit tube temperature change rate, and the external unit tube temperature change rate includes: Determine whether the internal machine pipe temperature is between a first internal machine pipe temperature preset value and a second internal machine pipe temperature preset value, and if so, obtain an external fan speed adjustment value by querying an external fan speed adjustment control table, and execute an external fan speed adjustment strategy according to the external fan speed adjustment value; The external fan speed adjustment control table stores different internal unit tube temperature change rate intervals and external fan speed adjustment values ​​corresponding to different external unit tube temperature change rate intervals.

4. The method according to claim 3, characterized in that: The external fan speed adjustment control table is obtained by the following steps, including: Set N preset values ​​of internal machine tube temperature change rates to obtain N+1 internal machine tube temperature change rate intervals; Set N preset values ​​of the external unit tube temperature change rate to obtain N+1 external unit tube temperature change rate intervals; The N+1 internal unit pipe temperature change rate intervals are used as the vertical table header, and the N+1 external unit pipe temperature change rate intervals are used as the horizontal table header to establish a blank external fan speed adjustment control table, where N is a positive integer; The external fan speed adjustment value corresponding to each cell is determined, and the determined external fan speed adjustment value is stored in the external fan speed adjustment control table.

5. The method according to claim 3, characterized in that: The step of executing the external fan speed adjustment strategy according to the external fan speed adjustment value includes: Determine the target speed of the external fan = the current speed of the external fan + the speed adjustment value of the external fan; The external fan is controlled to run at the target speed of the external fan.

6. The method according to claim 5, characterized in that Also includes: If the target speed of the external fan is greater than the maximum speed threshold of the external fan, the external fan is controlled to operate according to the maximum speed threshold of the external fan; If the target speed of the external fan is less than or equal to zero, the external fan is controlled to stop running.

7. The method according to claim 3, characterized in that Also includes: If the internal unit pipe temperature is not between the first internal unit pipe temperature preset value and the second internal unit pipe temperature preset value, but between the third internal unit pipe temperature preset value and the second pipe temperature preset value, stop the operation of the external fan; the third internal unit pipe temperature preset value < the second internal unit pipe temperature preset value < the first internal unit pipe temperature preset value; When the internal machine pipe temperature change rate V 内管 ≥Preset value of the third internal unit pipe temperature change rate V 内3 When the compressor frequency is increased, it is prohibited to increase the frequency; When the second internal machine pipe temperature change rate preset value V 内2 ≤V 内管 <V 内3 , control the compressor to start slow frequency reduction at the first frequency reduction speed; When V 内管 <V 内2 When the compressor is controlled to start fast reduction at the second frequency reduction speed until it drops to the lower limit value; wherein the second frequency reduction speed is greater than the first frequency reduction speed.

8. The method according to claim 7, characterized in that Also includes: If the internal machine pipe temperature is lower than the third internal machine pipe temperature preset value, the external fan is stopped and the compressor frequency is controlled to drop to the lower limit value; If V 内管 <V 内3 , control the electronic expansion valve to open at the rapid opening speed, and start the rapid opening timing; If the timing reaches the preset time, there is still V 内管 <V 内3 , the whole machine enters anti-freeze protection and the compressor stops.

9. An anti-freezing control device, characterized in that: include: Acquisition module, used to obtain outdoor ambient temperature, internal unit pipe temperature and external unit pipe temperature; A calculation module, used to calculate the change rate of the internal unit tube temperature according to the internal unit tube temperature, and to calculate the change rate of the external unit tube temperature according to the external unit tube temperature; The control module is used to adjust one or more of the compressor frequency, the external fan speed, and the electronic expansion opening according to the internal unit pipe temperature, the external unit pipe temperature, the internal unit pipe temperature change rate, and the external unit pipe temperature change rate, so as to maintain the internal unit pipe temperature in a non-freezing temperature zone to avoid freezing of the internal unit evaporator.

10. An air conditioner, characterized in that: include: A processor, and a memory connected to the processor; The memory is used to store computer programs; The processor is used to call and execute the computer program in the memory to perform the method according to any one of claims 1 to 9.

11. The air conditioner according to claim 10, characterized in that: include: Inverter heating and cooling wall mounted unit.

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