A defrosting control method and defrosting control system of an evaporator

Abstract

The application provides a defrosting control method and system of an evaporator, and relates to the technical field of household appliances. The application first acquires air outlet wind speeds and air outlet temperatures of multiple defrosting areas near the evaporator, the multiple defrosting areas being air supply areas of multiple fans installed near the evaporator, then calculates a wind speed difference between a maximum value and a minimum value of the air outlet wind speeds of the multiple defrosting areas, and finally controls rotating speeds and running times of the multiple fans according to the wind speed difference and the air outlet temperatures of the multiple defrosting areas. The technical scheme can control the running of the multiple fans according to the air outlet wind speeds and the air outlet temperatures of the multiple defrosting areas, ensure that the wind speeds and the temperatures of the multiple defrosting areas are relatively uniform, is beneficial to the overall heat exchange of the evaporator, can improve the heat exchange effect, and ensures energy saving and environmental protection.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a defrost control method and a defrost control system for an evaporator. Background Art

[0002] The existing dehumidifiers, window units, and other evaporator-side air supply structures only have one centrifugal fan or cross-flow fan. The air outlet speed and temperature at the evaporator are very uneven, resulting in poor heat exchange. Poor heat exchange may cause problems such as evaporator frosting, causing user complaints. Summary of the Invention

[0003] The first aspect of the present invention aims to provide a defrost control method for an evaporator, so as to solve the technical problem in the prior art that the evaporator is prone to frosting due to poor heat exchange effect.

[0004] A second aspect of the present invention aims to provide a defrost control system for an evaporator.

[0005] According to the purpose of the first aspect of the present invention, the present invention provides a defrost control method for an evaporator, comprising the following steps:

[0006] Obtaining the outlet air speed and outlet air temperature of multiple defrost areas near the evaporator, where the multiple defrost areas are air supply areas of multiple fans installed near the evaporator;

[0007] Calculating the wind speed difference between the maximum and minimum wind speeds of the air outlet of the plurality of defrost areas;

[0008] The rotation speeds and operating times of the plurality of fans are controlled according to the wind speed difference and the air outlet temperature of each of the defrosting areas.

[0009] Optionally, the step of controlling the rotation speeds and operating times of the plurality of fans according to the wind speed difference and the air outlet temperature of each of the defrost areas specifically includes the following steps:

[0010] When the wind speed difference is less than or equal to a first preset ratio of a maximum value among the multiple wind speeds, determining whether the multiple wind outlet temperatures are all within a preset temperature range;

[0011] If not, the speed of the fans corresponding to the plurality of air outlet temperatures lower than the preset temperature range is controlled to increase by a first preset value and run for a first preset time until the plurality of air outlet temperatures are all within the preset range.

[0012] Optionally, the step of controlling the rotation speeds and operating times of the plurality of fans according to the wind speed difference and the air outlet temperature of each of the defrost areas further includes the following steps:

[0013] When the wind speed difference is greater than a first preset proportion of a maximum value among the plurality of wind speeds and less than or equal to a second preset proportion of the maximum value, determining the wind temperature corresponding to the minimum wind speed in the defrost area;

[0014] The rotation speeds of the multiple fans are controlled according to the air outlet temperature corresponding to the minimum air outlet speed in the multiple defrosting areas.

[0015] Optionally, the step of controlling the rotational speeds of the plurality of fans according to the air outlet temperatures corresponding to the minimum rotational speeds in the plurality of defrost areas specifically includes the following steps:

[0016] Determining whether the air outlet temperature corresponding to the minimum air outlet speed in the plurality of defrost areas is within the preset temperature range;

[0017] If so, calculating the temperature difference between the outlet air temperature corresponding to the minimum outlet air speed in the plurality of defrost areas and the lower limit value in the preset temperature range;

[0018] The rotation speeds of the plurality of fans are controlled according to the temperature difference.

[0019] Optionally, the step of controlling the rotational speeds of the plurality of fans according to the temperature difference specifically includes:

[0020] When the temperature difference is greater than a third preset ratio of the lower limit value in the preset temperature range, the fan speed corresponding to the minimum air outlet speed in the multiple defrost areas is controlled to increase the first preset value and run for the first preset time until the air outlet temperatures of the multiple defrost areas are all within the preset range.

[0021] Optionally, the step of controlling the rotational speeds of the plurality of fans according to the temperature difference further includes:

[0022] When the temperature difference is less than or equal to a third preset ratio of the lower limit value in the preset temperature range, determining whether the defrost area with the smallest air flow speed among the plurality of defrost areas has a frost risk;

[0023] If so, the fan speed corresponding to the defrost area is controlled to increase to a second preset value and run for a second preset time.

[0024] Optionally, after the step of determining whether the air outlet temperature corresponding to the minimum air outlet speed in the plurality of defrost areas is within the preset temperature range, the step further includes:

[0025] If not, determining whether there is a frost risk in the defrost area with the smallest air outlet speed among the plurality of defrost areas;

[0026] If so, the fan speed corresponding to the defrost area is controlled to increase to a third preset value and run for a third preset time.

[0027] Optionally, the step of controlling the rotation speeds and operating times of the plurality of fans according to the wind speed difference and the air outlet temperature of each of the defrost areas further includes the following steps:

[0028] When the wind speed difference is greater than the second preset ratio of the maximum value among the plurality of wind speeds, determining whether there is a frost risk in the defrost area with the minimum wind speed among the plurality of defrost areas;

[0029] If so, the fan speed corresponding to the defrost area is controlled to increase to the third preset value and run for the third preset time.

[0030] According to the purpose of the second aspect of the present invention, the present invention further provides a defrost control system for an evaporator, comprising:

[0031] A control module includes a memory and a processor. The memory stores a calculation program, and the calculation program is used to implement the above-mentioned defrost control method when executed by the processor.

[0032] Optionally, it also includes:

[0033] evaporator;

[0034] A plurality of fans are evenly arranged in an array at the front side or the rear side of the evaporator, so that the defrosting area of ​​the evaporator is divided into a plurality of areas according to the positions of the plurality of fans.

[0035] The present invention first obtains the outlet air speed and outlet air temperature of multiple defrost zones near the evaporator. Multiple defrost zones are the air supply zones of multiple fans installed near the evaporator. The wind speed difference between the maximum and minimum outlet air speeds in the multiple defrost zones is then calculated. Finally, the speed and operating time of the multiple fans are controlled based on the wind speed difference and the outlet air temperature of each defrost zone. The above technical solution can control the operation of multiple fans based on the outlet air speed and outlet air temperature of each defrost zone, ensuring relatively uniform wind speed and temperature in each defrost zone, which is beneficial to the overall heat exchange of the evaporator, can improve the heat exchange effect, and ensure energy saving and environmental protection.

[0036] Furthermore, the present invention specifically controls the speeds and operating times of multiple fans based on the wind speed difference and the outlet air temperatures of each defrost zone. The steps include: first, when the wind speed difference is less than or equal to a first preset ratio of the maximum of the multiple outlet air speeds, determining whether the multiple outlet air temperatures are all within a preset temperature range; if not, increasing the speeds of the corresponding fans with outlet air temperatures below the preset temperature range by a first preset value and operating for a first preset duration until the multiple outlet air temperatures are all within the preset range. The above technical solution can specifically increase the speed of fans in low-temperature zones, rather than all fans, thereby ensuring energy savings.

[0037] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0039] Figure 1 is a schematic flow chart of a defrost control method for an evaporator according to an embodiment of the present invention;

[0040] Figure 2 is a schematic flow chart of a defrost control method for an evaporator according to another embodiment of the present invention;

[0041] Figure 3 is a schematic flow chart of a defrost control method for an evaporator according to yet another embodiment of the present invention;

[0042] Figure 4 is a schematic flow chart of a defrost control method for an evaporator according to yet another embodiment of the present invention;

[0043] Figure 5 is a schematic structural diagram of a defrost control system for an evaporator according to an embodiment of the present invention;

[0044] Figure 6 is a structural block diagram of a defrost control system for an evaporator according to another embodiment of the present invention. DETAILED DESCRIPTION

[0045] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0046] In the present invention, the terms "first", "second" and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" and "third" may explicitly or implicitly include at least one of the features, that is, include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. When a feature "includes or contains" one or some of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may further include other features.

[0047] Figure 1 FIG. 4 is a schematic flow chart of a defrost control method for an evaporator according to an embodiment of the present invention.

[0048] like Figure 1 As shown, in a specific embodiment, the defrost control method of the evaporator includes the following steps:

[0049] Step S100, obtaining the air outlet speed and air outlet temperature of multiple defrost areas near the evaporator, where the multiple defrost areas are air supply areas of multiple fans installed near the evaporator;

[0050] Step S200, calculating the wind speed difference between the maximum and minimum wind speeds of the air outlet of multiple defrost areas;

[0051] Step S300: controlling the rotation speeds and operating times of the multiple fans according to the wind speed difference and the air outlet temperature of each defrost area.

[0052] This embodiment can control the operation of multiple fans according to the air outlet speed and air outlet temperature of each defrost area, ensuring that the wind speed and temperature of each defrost area are relatively uniform, which is beneficial to the overall heat exchange of the evaporator, can improve the heat exchange effect, and ensure energy saving and environmental protection.

[0053] Here, specifically, after the cooling mode of the device is turned on and operated for a period of time, the outlet air temperature and outlet air speed of multiple defrosting areas are obtained, and multiple fans are used to defrost the evaporator. In this embodiment, the device can be an air conditioner and a dehumidifier.

[0054] In this embodiment, it is equivalent to multiple fans dividing the defrost area of ​​the evaporator into multiple areas, so that multiple fans defrost the multiple areas respectively. Due to various reasons, the defrost temperatures of each area may be different. Therefore, through the above-mentioned logical control, different controls can be performed on the fans of multiple areas, which can meet the defrost needs of different areas and achieve energy-saving effects.

[0055] Figure 2FIG. 1 is a schematic flow chart of a defrost control method for an evaporator according to another embodiment of the present invention. Figure 2 As shown, in this embodiment, step S300 specifically includes the following steps:

[0056] Step S31, determining whether the wind speed difference is less than or equal to a first preset ratio a of the maximum value of the plurality of outlet wind speeds; if so, executing step S32; if not, executing step S41;

[0057] Step S32: Determine whether the multiple air outlet temperatures are all within the preset temperature range; if so, execute step S33;

[0058] Step S33 controls the speed of the corresponding fans whose outlet air temperatures are below the preset temperature range to increase by a first preset value and run for a first preset duration until all outlet air temperatures are within the preset range. This means that after increasing the corresponding fan speed by the first preset value and running for the first preset duration, the process returns to step S32 to re-determine whether all outlet air temperatures are within the preset temperature range. The first preset value and first preset duration are set based on specific design requirements.

[0059] This embodiment can specifically increase the speed of fans in low-temperature areas instead of increasing the speed of all fans, thereby ensuring energy-saving effects.

[0060] Step S41, determining whether the wind speed difference is greater than a first preset proportion a of the maximum value among the plurality of outlet wind speeds and less than or equal to a second preset proportion b of the maximum value; if so, executing step S42; if not, executing step S51;

[0061] Step S42, determining the air outlet temperature corresponding to the minimum air outlet speed in the defrost area;

[0062] Step S43, controlling the rotation speeds of the multiple fans according to the air outlet temperatures corresponding to the minimum air outlet speeds in the multiple defrost areas;

[0063] Step S51, determining whether the wind speed difference is greater than a second preset ratio b of the maximum value among the plurality of outlet wind speeds; if so, executing step S52;

[0064] Step S52: Determine whether there is a risk of frost in the defrost area with the minimum air flow speed among the multiple defrost areas; if so, execute step S53;

[0065] Step S53: Control the fan corresponding to the defrost area to increase its speed to a third preset value and run for a third preset time. Here, the third preset value and the third preset time are specifically set according to specific design requirements.

[0066] Figure 3FIG. 1 is a schematic flow chart of a defrost control method for an evaporator according to another embodiment of the present invention. Figure 3 As shown, in this embodiment, step S43 specifically includes the following steps:

[0067] Step S431, determining whether the air outlet temperature corresponding to the minimum air outlet speed in the plurality of defrost zones is within a preset temperature range; if so, executing step S432;

[0068] Step S432, calculating the temperature difference between the outlet air temperature corresponding to the minimum outlet air speed in the plurality of defrost zones and the lower limit of the preset temperature range;

[0069] Step S433: controlling the rotation speeds of the multiple fans according to the temperature difference.

[0070] Figure 4 FIG. 1 is a schematic flow chart of a defrost control method for an evaporator according to another embodiment of the present invention. Figure 4 As shown, in this embodiment, step S433 specifically includes the following steps:

[0071] Step S61, determining whether the temperature difference is greater than a third preset ratio c of the lower limit value in the preset temperature range; if so, executing step S62; if not, executing step S63;

[0072] In step S62, the fan speed corresponding to the minimum air outlet speed in the plurality of defrost zones is increased by a first preset value and operated for a first preset duration until the air outlet temperatures in the plurality of defrost zones are all within a preset range. This can be understood as returning to step S32 after increasing the corresponding fan speed by the first preset value and operating for the first preset duration to re-determine whether the plurality of air outlet temperatures are all within the preset temperature range.

[0073] Step S63, determining whether the defrost area with the minimum air flow speed among the multiple defrost areas has a risk of frost formation; if so, executing step S64; if not, executing step S52;

[0074] Step S64: Control the fan speed corresponding to the defrost area to increase to a second preset value and run for a second preset time. Here, the second preset value and the second preset time are specifically set according to specific design requirements.

[0075] Here, the first preset ratio a is any value between 8% and 12%. For example, it can be 8%, 10% or 12%. In a preferred embodiment, the first preset ratio a is 10%.

[0076] The second preset ratio b is any value between 28% and 32%, for example, 28%, 30% or 32%.

[0077] In a preferred embodiment, the second preset ratio b is 30%.

[0078] The third preset ratio c is any value between 8% and 12%, for example, 8%, 10% or 12%.

[0079] In a preferred embodiment, the third preset ratio c is 10%.

[0080] The preset temperature range is set according to the indoor ambient temperature, and is generally 10℃ to 15℃ lower than the indoor ambient temperature.

[0081] Figure 5 FIG. 1 is a schematic structural diagram of a defrost control system 100 for an evaporator according to an embodiment of the present invention. Figure 5 As shown, the arrows in the figure indicate the direction of wind flow. In this embodiment, the evaporator defrost control system 100 further includes an evaporator 30 and multiple fans 20. The multiple fans 20 are evenly arranged in an array in front of or behind the evaporator 30, thereby dividing the defrost area of ​​the evaporator 30 into multiple areas according to the locations of the multiple fans 20. Air ducts 40 are provided around the multiple fans 20 for intake of air to drive the multiple fans 20 to rotate.

[0082] In this embodiment, the number of the multiple fans 20 is four, that is, the defrost area of ​​the evaporator 30 is divided into four defrost areas, so that different controls can be performed on the fans 20 in multiple areas, which can meet the defrost requirements of different areas and achieve energy-saving effects.

[0083] In this embodiment, the evaporator defrost control system 100 further includes a plurality of temperature sensors, each of which is disposed on the air outlet side of the evaporator 30 to detect the air outlet temperature of the plurality of defrost zones. The plurality of temperature sensors are aligned with the positions of the plurality of fans 20.

[0084] The evaporator defrost control system 100 further includes a plurality of wind speed sensors mounted on the front or rear side of the evaporator 30 to detect the wind speed of air flowing out of different areas of the evaporator 30. The plurality of wind speed sensors are aligned with the positions of the plurality of fans 20.

[0085] Figure 6 FIG. 1 is a block diagram of a defrost control system 100 for an evaporator according to another embodiment of the present invention. Figure 6As shown, in this embodiment, an evaporator defrost control system 100 includes a control module 10, which includes a memory and a processor. The memory stores a computer program that, when executed by the processor, implements the defrost control method described above. The control module 10 includes a memory 11 and a processor 12. The memory 11 stores a computer program that, when executed by the processor 12, implements the control method described above. The processor 12 can be a central processing unit (CPU), a digital processing unit, or the like. The processor 12 sends and receives data via a communication interface. The memory 11 stores the program executed by the processor 12. The memory 11 is any medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, and can also be a combination of multiple memories 11. The computer program can be downloaded from a computer-readable storage medium to a corresponding computing / processing device or downloaded to a computer or external storage device via a network (e.g., the Internet, a local area network, a wide area network, and / or a wireless network).

[0086] For the purposes of the description of this embodiment, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transmit a program for use with or in conjunction with an instruction execution system, device, or apparatus. More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection having one or more wires (electronic devices), a portable computer disk cartridge (magnetic devices), a random access memory (RAM), a read-only memory (ROM), an erasable and editable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disc read-only memory (CDROM). In addition, the computer-readable medium can even be paper or other suitable medium on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting, or processing in other suitable ways as necessary, and then stored in a computer memory.

[0087] In this embodiment, the control module 10 is connected to multiple temperature sensors and multiple wind speed sensors. The control module 10 is configured to first obtain the outlet wind speed and outlet air temperature of multiple defrost areas near the evaporator 30, and then calculate the wind speed difference between the maximum and minimum wind speeds of the multiple defrost areas, and finally control the speed and operating time of multiple fans 20 according to the wind speed difference and the outlet air temperature of each defrost area.

[0088] In this embodiment, the control module 10 is further configured to: when the wind speed difference is less than or equal to a first preset ratio of the maximum value of multiple air outlet wind speeds, if the air outlet temperature is not within the preset temperature range, the speed of the corresponding fan 20 among the multiple air outlet temperatures that are lower than the preset temperature range is controlled to increase by a first preset value and run for a first preset time until the multiple air outlet temperatures are all within the preset range.

[0089] In this embodiment, the control module 10 is further configured to: determine the outlet air temperature corresponding to the minimum outlet air speed in the defrost area when the wind speed difference is greater than a first preset proportion of the maximum value among multiple outlet air speeds and less than or equal to a second preset proportion of the maximum value, and then control the rotation speed of multiple fans 20 according to the outlet air temperature corresponding to the minimum outlet air speed in multiple defrost areas.

[0090] In this embodiment, the control module 10 is further configured to: if the air outlet temperature corresponding to the minimum air outlet speed in multiple defrost areas is within a preset temperature range, then calculate the temperature difference between the air outlet temperature corresponding to the minimum air outlet speed in multiple defrost areas and the lower limit value in the preset temperature range; and then control the rotation speed of multiple fans 20 according to the temperature difference.

[0091] In this embodiment, the control module 10 is also configured to: when the temperature difference is greater than a third preset proportion of the lower limit value in the preset temperature range, control the speed of the fan 20 corresponding to the minimum air outlet speed in multiple defrost areas to increase by a first preset value and run for a first preset time until the air outlet temperatures of multiple defrost areas are all within the preset range.

[0092] In this embodiment, the control module 10 is further configured to: when the temperature difference is less than or equal to a third preset ratio of the lower limit value in the preset temperature range, if there is a risk of frost in the defrost area with the smallest air outlet speed among multiple defrost areas, the speed of the fan 20 corresponding to the defrost area is controlled to increase by a second preset value and run for a second preset time.

[0093] In this embodiment, the control module 10 is further configured to: when the wind speed difference is greater than a second preset ratio of the maximum value of multiple air outlet speeds, if there is a risk of frost in the defrost area with the smallest air outlet speed among multiple defrost areas, the speed of the fan 20 corresponding to the defrost area is controlled to increase by a third preset value and run for a third preset time.

[0094] In this embodiment, the data on the outlet air speed and temperature of each defrost zone are transmitted to the control module 10. The control module 10 controls the speed of the fan 20 in each defrost zone based on the data, ensuring that the outlet air speed and temperature of each defrost zone are relatively uniform. This is beneficial to the overall heat exchange of the evaporator 30, can improve energy efficiency, and ensure energy conservation and environmental protection. This embodiment, combined with the intelligent control program, can achieve automatic optimization of the air supply of the entire machine.

[0095] At this point, those skilled in the art will recognize that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications consistent with the principles of the present invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims

1. A defrost control method for an evaporator, characterized in that: The following steps are involved: Obtaining the outlet air speed and outlet air temperature of multiple defrost areas near the evaporator, where the multiple defrost areas are air supply areas of multiple fans installed near the evaporator; Calculating the wind speed difference between the maximum and minimum wind speeds of the air outlet of the plurality of defrost areas; The speed and operation time of the plurality of fans are controlled according to the wind speed difference and the air outlet temperature of each defrosting area; wherein, The step of controlling the rotation speeds and operating times of the plurality of fans according to the wind speed difference and the air outlet temperature of each of the defrost areas specifically includes the following steps: When the wind speed difference is less than or equal to a first preset ratio of a maximum value among the plurality of outlet wind speeds, determining whether the plurality of outlet air temperatures are all within a preset temperature range; If not, the speed of the fans corresponding to the plurality of air outlet temperatures lower than the preset temperature range is controlled to increase by a first preset value and run for a first preset time until the plurality of air outlet temperatures are all within the preset temperature range.

2. The defrost control method according to claim 1, characterized in that: The step of controlling the rotation speeds and operating times of the plurality of fans according to the wind speed difference and the air outlet temperature of each of the defrost areas further includes the following steps: When the wind speed difference is greater than a first preset proportion of a maximum value among the plurality of wind speeds and less than or equal to a second preset proportion of the maximum value, determining the wind temperature corresponding to the minimum wind speed in the defrost area; The rotation speeds of the multiple fans are controlled according to the air outlet temperature corresponding to the minimum air outlet speed in the multiple defrosting areas.

3. The defrost control method according to claim 2, characterized in that: The step of controlling the rotation speeds of the plurality of fans according to the air outlet temperatures corresponding to the minimum rotation speeds in the plurality of defrost areas specifically comprises the following steps: Determining whether the air outlet temperature corresponding to the minimum air outlet speed in the plurality of defrost areas is within the preset temperature range; If so, calculating the temperature difference between the outlet air temperature corresponding to the minimum outlet air speed in the plurality of defrost areas and the lower limit value in the preset temperature range; The rotation speeds of the plurality of fans are controlled according to the temperature difference.

4. The defrost control method according to claim 3, characterized in that: The step of controlling the rotational speeds of the plurality of fans according to the temperature difference specifically includes: When the temperature difference is greater than a third preset ratio of the lower limit value in the preset temperature range, the fan speed corresponding to the minimum air outlet speed in the multiple defrost areas is controlled to increase the first preset value and run for the first preset time until the air outlet temperatures of the multiple defrost areas are within the preset temperature range.

5. The defrost control method according to claim 4, characterized in that: The step of controlling the rotation speeds of the plurality of fans according to the temperature difference further includes: When the temperature difference is less than or equal to a third preset ratio of the lower limit value in the preset temperature range, determining whether the defrost area with the smallest air flow speed among the plurality of defrost areas has a frost risk; If so, the fan speed corresponding to the defrost area is controlled to increase to a second preset value and run for a second preset time.

6. The defrost control method according to claim 3, characterized in that: The step of determining whether the air outlet temperature corresponding to the minimum air outlet speed in the plurality of defrost areas is within the preset temperature range further includes: If not, determining whether there is a frost risk in the defrost area with the smallest air outlet speed among the plurality of defrost areas; If so, the fan speed corresponding to the defrost area is controlled to increase to a third preset value and run for a third preset time.

7. The defrost control method according to claim 6, characterized in that: The step of controlling the rotation speeds and operating times of the plurality of fans according to the wind speed difference and the air outlet temperature of each of the defrost areas further includes the following steps: When the wind speed difference is greater than the second preset ratio of the maximum value among the plurality of wind speeds, determining whether there is a frost risk in the defrost area with the minimum wind speed among the plurality of defrost areas; If so, the fan speed corresponding to the defrost area is controlled to increase to the third preset value and run for the third preset time.

8. A defrost control system for an evaporator, characterized in that: include: A control module, the control module includes a memory and a processor, the memory stores a calculation program, and the calculation program is used to implement the defrost control method according to any one of claims 1 to 7 when executed by the processor.

9. The defrost control system according to claim 8, further comprising: evaporator; A plurality of fans are evenly arranged in an array at the front side or the rear side of the evaporator, so that the defrosting area of ​​the evaporator is divided into a plurality of areas according to the positions of the plurality of fans.

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