Refrigeration appliance, evaporative fan operation control method and program product

Abstract

The application relates to the refrigeration technical field, in particular to a refrigeration equipment, an evaporative fan operation control method and a program product, the refrigeration equipment comprising: an evaporator; an evaporative fan used for leading out airflow after heat exchange with the evaporator; a controller connected to the evaporative fan in a single-phase line and configured to: collect inlet air temperature and outlet air temperature of the evaporator; substitute preset temperature, inlet air temperature and outlet air temperature into a target function to obtain a voltage adjustment coefficient; generate driving voltage of the evaporative fan based on the voltage adjustment coefficient and maximum operation voltage of the evaporative fan, the driving voltage and the voltage adjustment coefficient being in a positive correlation; and output the driving voltage to the evaporative fan based on the single-phase line, the rotating speed of the evaporative fan and the driving voltage being in a positive correlation. The refrigeration equipment provided by the application can reduce material cost, manual assembly cost and maintenance cost of the refrigeration equipment by connecting the evaporative fan through the single-phase line and controlling operation of the evaporative fan.

Description

Technical Field

[0001] This application belongs to the field of refrigeration technology, and in particular relates to a refrigeration device, an evaporator fan operation control method and program product. Background Technology

[0002] In refrigeration equipment, the evaporator fan is a key component that drives airflow through the evaporator to achieve forced convection heat transfer. The controller of the refrigeration equipment supplies power to the evaporator fan via the neutral and live wires of a single-phase circuit, and provides control commands to the evaporator fan via an additional control signal line.

[0003] However, the need for additional control signal lines for the controller and evaporator fan necessitates the installation of more connection terminals and connectors within the refrigeration equipment, increasing material and assembly costs and consequently raising manufacturing costs. Furthermore, the electrical interface of the evaporator fan is bound to the signal logic of a specific controller, making it difficult to interchange evaporator fans of the same specification between refrigeration equipment with different control logics, thus increasing maintenance costs. Summary of the Invention

[0004] In view of the above, embodiments of this application provide a refrigeration device, an evaporator fan operation control method and program product to overcome the problems of the prior art.

[0005] In a first aspect, embodiments of this application provide a refrigeration device, including: Evaporator; An evaporator fan is used to draw out the airflow after heat exchange with the evaporator; The controller, a single-phase line connected to the evaporator fan, is configured as follows: Collect the inlet and outlet temperatures of the evaporator; Substituting the preset temperature, the inlet temperature, and the outlet temperature into the objective function yields the voltage adjustment coefficient. The objective function characterizes the mapping relationship between the preset temperature, the inlet temperature, the outlet temperature, and the voltage adjustment coefficient. The voltage adjustment coefficient characterizes the proportion by which the driving voltage of the evaporator fan is adjusted according to the cooling temperature difference of the refrigeration equipment. The cooling temperature difference includes a first differential temperature between the inlet temperature and the preset temperature and a second differential temperature between the inlet temperature and the outlet temperature. The first differential temperature characterizes the difference between the inlet temperature and the preset temperature, and the second differential temperature characterizes the difference between the inlet temperature and the outlet temperature. The driving voltage is generated based on the voltage adjustment coefficient and the maximum operating voltage of the evaporator fan, and the driving voltage is positively correlated with the voltage adjustment coefficient. The driving voltage is output to the evaporator fan based on the single-phase line, and the rotational speed of the evaporator fan is positively correlated with the driving voltage.

[0006] The refrigeration equipment provided in this application uses a controller connected to the evaporator fan via a single-phase line, eliminating the need for additional control signal lines. This reduces the number of connection terminals and connectors within the refrigeration equipment, thereby lowering material and assembly costs. Furthermore, the controller's single-phase line operation allows for interchangeable use of evaporator fans of the same specification across refrigeration equipment with different control logics, reducing maintenance costs. The controller adjusts the evaporator fan speed based on detected inlet and outlet air temperatures and a preset temperature. Since the inlet and outlet air temperatures are continuously changing, continuous speed control of the evaporator fan is possible. This overcomes the problem of traditional evaporator fans only offering two speed settings, leading to a mismatch between the fan speed and the evaporator's inlet and outlet air temperatures, thus improving the refrigeration equipment's operational efficiency.

[0007] In some optional embodiments, the controller substitutes the preset temperature, the inlet temperature, and the outlet temperature into the objective function to obtain a voltage adjustment coefficient, which is configured as follows: Calculate the first temperature difference between the air inlet temperature and the preset temperature, and the second temperature difference between the air inlet temperature and the air outlet temperature. Substituting the first differential temperature and the second differential temperature into the objective function yields the voltage adjustment coefficient.

[0008] The solution provided in this embodiment calculates the corresponding voltage adjustment coefficient based on the temperature difference between the inlet temperature and the preset temperature and the outlet temperature, as well as the mapping relationship between the preset temperature, the inlet temperature, the outlet temperature and the voltage adjustment coefficient, thereby improving the accuracy of the voltage adjustment coefficient calculation.

[0009] In some optional embodiments, the objective function includes a difference function, which characterizes the mapping relationship between the first differential temperature, the second differential temperature, and the voltage adjustment coefficient. The controller substitutes the first differential temperature and the second differential temperature into the objective function to obtain the voltage adjustment coefficient, which is configured as follows: Substituting the first differential temperature and the second differential temperature into the differential function yields the voltage adjustment coefficient.

[0010] The solution provided in this embodiment calculates the corresponding voltage adjustment coefficient based on the temperature difference and difference function between the inlet temperature and the preset temperature and the outlet temperature, thereby improving the accuracy of the voltage adjustment coefficient calculation.

[0011] In some optional embodiments, the objective function includes an integral function, which is used to characterize the mapping relationship between the first integral temperature, the second integral temperature and the voltage adjustment coefficient. The first integral temperature is used to characterize the integral of the first differential temperature within a preset time period, and the second integral temperature is used to characterize the integral of the second differential temperature within a preset time period. The controller substitutes the first differential temperature and the second differential temperature into the objective function to obtain the voltage adjustment coefficient, which is configured as follows: The time elapsed from the start time of the compressor of the refrigeration equipment to the current time is identified as the preset time elapsed; The first differential temperature and the second differential temperature are integrated within the preset time period to obtain the first integrated temperature and the second integrated temperature. Substituting the first integral temperature and the second integral temperature into the integral function yields the voltage adjustment coefficient.

[0012] The solution provided in this embodiment calculates the corresponding voltage adjustment coefficient based on the integral temperature and integral function of the inlet temperature with the preset temperature and the outlet temperature, respectively, thereby improving the accuracy of the voltage adjustment coefficient calculation.

[0013] In some optional embodiments, the objective function includes a differential function, which is used to characterize the mapping relationship between the first differential temperature, the second differential temperature and the voltage adjustment coefficient. The first differential temperature is obtained by differential calculation based on the first differential temperature, and the second differential temperature is obtained by differential calculation based on the second differential temperature. The controller substitutes the first differential temperature and the second differential temperature into the objective function to obtain the voltage adjustment coefficient, which is configured as follows: Differential calculations are performed on the first differential temperature and the second differential temperature respectively to obtain the first differential temperature and the second differential temperature; Substituting the first differential temperature and the second differential temperature into the differential function yields the voltage adjustment coefficient.

[0014] The solution provided in this embodiment calculates the corresponding voltage adjustment coefficient based on the differential temperature and differential function of the inlet temperature and the preset temperature and outlet temperature, respectively, thereby improving the accuracy of the voltage adjustment coefficient calculation.

[0015] In some optional embodiments, the objective function includes a difference function, an integral function, and a differential function; the difference function characterizes the mapping relationship between the first differential temperature, the second differential temperature, and the voltage adjustment coefficient; the integral function characterizes the mapping relationship between the first integral temperature, the second integral temperature, and the voltage adjustment coefficient, wherein the first integral temperature characterizes the integral of the first differential temperature over a preset time period, and the second integral temperature characterizes the integral of the second differential temperature over a preset time period; the differential function characterizes the mapping relationship between the first differential temperature, the second differential temperature, and the voltage adjustment coefficient, wherein the first differential temperature is obtained by differential calculation of the first differential temperature, and the second differential temperature is obtained by differential calculation of the second differential temperature; The controller substitutes the first differential temperature and the second differential temperature into the objective function to obtain the voltage adjustment coefficient, which is configured as follows: The time elapsed from the start time of the compressor of the refrigeration equipment to the current time is identified as the preset time elapsed; The first differential temperature and the second differential temperature are integrated within the preset time period to obtain the first integrated temperature and the second integrated temperature. Differential calculations are performed on the first differential temperature and the second differential temperature respectively to obtain the first differential temperature and the second differential temperature; The voltage adjustment coefficient is obtained by substituting the first differential temperature and the second differential temperature into the differential function, the first integral temperature and the second integral temperature into the integral function, and the first differential temperature and the second differential temperature into the differential function.

[0016] The solution provided in this embodiment calculates the corresponding voltage adjustment coefficient based on the difference temperature and difference function between the inlet temperature and the preset temperature and the outlet temperature, the integral temperature and integral function between the inlet temperature and the preset temperature and the outlet temperature, and the differential temperature and differential function between the inlet temperature and the outlet temperature, thereby improving the accuracy of the voltage adjustment coefficient calculation.

[0017] In some optional embodiments, the refrigeration equipment is a freezer, and the controller collects the inlet and outlet temperatures of the evaporator and is configured as follows: With the freezer door closed, the inlet temperature and the outlet temperature are collected.

[0018] The solution provided in this embodiment collects the inlet and outlet temperatures when the freezer door is detected to be closed. This avoids the inaccuracy of outlet temperature collection caused by the diffusion of warmer air from outside the freezer to the evaporator outlet when the door is open, thus improving the accuracy of outlet temperature collection.

[0019] In some optional embodiments, the controller is further configured to: When the freezer door is open, the evaporator fan is stopped.

[0020] The solution provided in this embodiment controls the evaporator fan to stop running when the freezer door is detected to be open. This slows down the convection exchange rate between the cold air that has exchanged heat with the evaporator and the hot air outside the freezer, thereby reducing the rate at which cold energy dissipates to the outside of the freezer and improving the energy efficiency of the freezer.

[0021] Secondly, embodiments of this application provide an evaporator fan operation control method, applied to a refrigeration device, the refrigeration device including an evaporator and an evaporator fan, the evaporator fan being used to draw out the airflow after heat exchange with the evaporator; The evaporator fan operation control method includes: Collect the inlet and outlet temperatures of the evaporator; Substituting the preset temperature, the inlet temperature, and the outlet temperature into the objective function yields the voltage adjustment coefficient. The objective function characterizes the mapping relationship between the preset temperature, the inlet temperature, the outlet temperature, and the voltage adjustment coefficient. The voltage adjustment coefficient characterizes the proportion by which the driving voltage of the evaporator fan is adjusted according to the cooling temperature difference of the refrigeration equipment. The cooling temperature difference includes a first differential temperature between the inlet temperature and the preset temperature and a second differential temperature between the inlet temperature and the outlet temperature. The first differential temperature characterizes the difference between the inlet temperature and the preset temperature, and the second differential temperature characterizes the difference between the inlet temperature and the outlet temperature. The driving voltage is generated based on the voltage adjustment coefficient and the maximum operating voltage of the evaporator fan, and the driving voltage is positively correlated with the voltage adjustment coefficient. The driving voltage is output to the evaporator fan based on a single-phase line, and the rotational speed of the evaporator fan is positively correlated with the driving voltage.

[0022] Thirdly, this application provides an evaporator fan operation control device for use in refrigeration equipment. The refrigeration equipment includes an evaporator and an evaporator fan, and the evaporator fan is used to draw out the airflow after heat exchange with the evaporator. The evaporator fan operation control device includes: The data acquisition module is used to acquire the inlet and outlet temperatures of the evaporator. The substitution module is used to substitute the preset temperature, the air inlet temperature, and the air outlet temperature into the objective function to obtain the voltage adjustment coefficient. The objective function is used to characterize the mapping relationship between the preset temperature, the air inlet temperature, the air outlet temperature, and the voltage adjustment coefficient. The voltage adjustment coefficient is used to characterize the proportion by which the driving voltage of the evaporator fan is adjusted according to the cooling temperature difference of the refrigeration equipment. The cooling temperature difference includes a first difference temperature between the air inlet temperature and the preset temperature and a second difference temperature between the air inlet temperature and the air outlet temperature. The first difference temperature is used to characterize the difference between the air inlet temperature and the preset temperature, and the second difference temperature is used to characterize the difference between the air inlet temperature and the air outlet temperature. A generation module is used to generate the driving voltage based on the voltage adjustment coefficient and the maximum operating voltage of the evaporator fan, wherein the driving voltage is positively correlated with the voltage adjustment coefficient. The output module is used to output the driving voltage to the evaporator fan based on a single-phase line, and the rotational speed of the evaporator fan is positively correlated with the driving voltage.

[0023] Fourthly, embodiments of this application provide a computer-readable storage medium storing program code, which can be called by a processor to execute the evaporator fan operation control method provided in the second aspect above.

[0024] Fifthly, embodiments of this application provide a computer program product that, when run on a computer device, causes the computer device to execute the evaporator fan operation control method provided in the second aspect above.

[0025] It is understood that the beneficial effects of the second to fifth aspects mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This illustration shows a scenario diagram of a refrigeration device provided in an embodiment of this application.

[0028] Figure 2 A flowchart illustrating an evaporator fan operation control method provided in an embodiment of this application is shown.

[0029] Figure 3 This paper illustrates another flowchart of the operation control of the evaporator fan provided in an embodiment of this application.

[0030] Figure 4 A structural block diagram of an evaporator fan operation control device provided in an embodiment of this application is shown.

[0031] Figure 5 This application illustrates a computer-readable storage medium for storing or carrying program code that implements the evaporator fan operation control method provided in this application.

[0032] Figure 6 This application illustrates a computer program product for storing or carrying program code that implements the evaporator fan operation control method provided in the embodiments of this application. Detailed Implementation

[0033] To make the inventive objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] It should be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0035] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0036] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0037] Furthermore, in the description of this application, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] In refrigeration equipment, the evaporator fan is a key component that drives airflow through the evaporator to achieve forced convection heat transfer. The controller of the refrigeration equipment supplies power to the evaporator fan via the neutral and live wires of a single-phase circuit, and provides control commands to the evaporator fan via an additional control signal line.

[0039] However, the need for additional control signal lines for the controller and evaporator fan necessitates the installation of more connection terminals and connectors within the refrigeration equipment, increasing material and assembly costs and consequently raising manufacturing costs. Furthermore, the electrical interface of the evaporator fan is bound to the signal logic of a specific controller, making it difficult to interchange evaporator fans of the same specification between refrigeration equipment with different control logics, thus increasing maintenance costs.

[0040] To address the aforementioned issues, the refrigeration equipment, evaporator fan operation control method, and program product provided in this application collect the inlet and outlet temperatures of the evaporator. Substituting these temperatures (preset temperature, inlet temperature, and outlet temperature) into a target function yields a voltage adjustment coefficient. The target function characterizes the mapping relationship between the preset temperature, inlet temperature, outlet temperature, and voltage adjustment coefficient. Based on the voltage adjustment coefficient and the maximum operating voltage of the evaporator fan, a drive voltage for the evaporator fan is generated. The drive voltage is positively correlated with the voltage adjustment coefficient. Furthermore, the drive voltage is output to the evaporator fan via a single-phase line, and the evaporator fan speed is positively correlated with the drive voltage. This achieves single-phase line-based operation control of the evaporator fan, eliminating the need for additional control signal lines. This reduces the number of connection terminals and connectors within the refrigeration equipment, thus reducing material and assembly costs. Moreover, single-phase line-based operation control allows evaporator fans of the same specification to be interchanged between refrigeration equipment with different control logics, reducing maintenance costs. Furthermore, based on the detected inlet air temperature, outlet air temperature, and preset temperature of the evaporator, the speed of the evaporator fan is adjusted. Since the inlet air temperature and outlet air temperature of the evaporator are continuously changing, the speed of the evaporator fan can be continuously adjusted. This can suppress the problem that traditional evaporator fans can only switch between two speeds, which leads to a mismatch between the speed of the evaporator fan and the inlet air temperature and outlet air temperature of the evaporator. This is beneficial to improving the operating energy efficiency of refrigeration equipment.

[0041] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0042] Please see Figure 1The illustration shows an application scenario diagram of the refrigeration device 10 provided in the embodiments of this application. The refrigeration device 10 may include a housing 100, an evaporator 200, an evaporator fan 300, and a controller 400. The evaporator 200, the evaporator fan 300, and the controller 400 may be installed on the housing 100, and the housing 100 may provide installation support for the evaporator 200, the evaporator fan 300, and the controller 400.

[0043] In this embodiment, the material of the housing 100 can be any of metal, plastic, tempered glass, ceramic or polymer, etc., and is not limited here.

[0044] In this embodiment, the evaporator 200 can be used to exchange heat with the air in contact with the evaporator 200. The evaporator 200 can be any one of a finned tube evaporator, a plate tube evaporator, or a coil evaporator, etc., without limitation.

[0045] In this embodiment, the evaporator fan 300 can be installed relative to the evaporator 200 and is used to draw out the airflow after heat exchange with the evaporator 200. The evaporator fan 300 can be any of the following: axial fan or centrifugal fan, etc., without limitation.

[0046] In this embodiment of the application, the controller 400 can be connected to the evaporator fan 300 based on a single-phase line, and control the operation of the evaporator fan 300 based on the single-phase line.

[0047] The controller 400 can be any of the following: a micro controller unit (MCU), a central processing unit (CPU), a combinational logic controller (CLC), a complex programmable logic device (CPLD), or a field programmable gate array (FPGA), etc., without any limitation here.

[0048] In this embodiment, the refrigeration device 10 can be any of the following: freezer, refrigerator, or air conditioner, etc., without limitation.

[0049] Please see Figure 2 The diagram illustrates a flowchart of an evaporator fan operation control method according to an embodiment of this application. In a specific embodiment, the evaporator fan operation control method can be applied to, for example... Figure 1 The controller 400 in the refrigeration equipment 10 shown below will be used as an example to explain... Figure 2 The process shown is described in detail. The operation control method of the evaporator fan may include the following steps 101 to 104.

[0050] Step 101: Collect the inlet and outlet temperatures of the evaporator.

[0051] In this embodiment of the application, during the operation of the refrigeration equipment, the controller can collect the inlet temperature and outlet temperature of the evaporator.

[0052] The refrigeration equipment may also include a first temperature sensor and a second temperature sensor, which are communicatively connected to the controller and interact with the controller for data exchange.

[0053] The first temperature sensor can be installed at the air inlet of the evaporator to collect the inlet temperature. The second temperature sensor can be installed at the air outlet of the evaporator to collect the outlet temperature.

[0054] The controller can send a first acquisition command to the first temperature sensor and the second temperature sensor. The first temperature sensor receives and responds to the first acquisition command, acquires the air inlet temperature of the evaporator, and sends the air inlet temperature to the controller. The second temperature sensor receives and responds to the first acquisition command, acquires the air outlet temperature of the evaporator, and sends the air outlet temperature to the controller. The controller receives the air inlet temperature returned by the first temperature sensor and the air outlet temperature returned by the second temperature sensor.

[0055] Both the first and second temperature sensors can be any of the following: resistive temperature sensors, thermocouple temperature sensors, ultrasonic temperature sensors, or infrared temperature sensors; no specific limitation is made here.

[0056] Step 102: Substitute the preset temperature, inlet temperature, and outlet temperature into the objective function to obtain the voltage adjustment coefficient.

[0057] In this embodiment, after the controller collects the inlet and outlet temperatures of the evaporator, it can substitute the preset temperature, inlet temperature, and outlet temperature into the objective function to obtain the voltage adjustment coefficient.

[0058] The objective function can be used to characterize the mapping relationship between the preset temperature, the inlet temperature, the outlet temperature and the voltage adjustment coefficient.

[0059] The voltage adjustment coefficient can be used to characterize the proportion by which the driving voltage of the evaporator fan is adjusted according to the refrigeration temperature difference of the refrigeration equipment, that is, the degree of influence of the refrigeration temperature difference of the refrigeration equipment on the driving voltage of the evaporator fan. The value range of the voltage adjustment coefficient can be (0, 1).

[0060] The cooling temperature difference can include a first differential temperature between the inlet temperature and the preset temperature and a second differential temperature between the inlet temperature and the outlet temperature. The first differential temperature can be used to characterize the difference between the inlet temperature and the preset temperature, and the second differential temperature can be used to characterize the difference between the inlet temperature and the outlet temperature.

[0061] The controller can calculate the first differential temperature between the inlet temperature and the preset temperature, and the second differential temperature between the inlet temperature and the outlet temperature. Substituting the first and second differential temperatures into the objective function, the voltage adjustment coefficient is obtained. This realizes the mapping relationship between the differential temperatures between the inlet temperature and the preset temperature and the outlet temperature, and between the preset temperature, the inlet temperature, the outlet temperature, and the voltage adjustment coefficient, thereby improving the accuracy of the voltage adjustment coefficient calculation.

[0062] The controller can calculate the difference between the inlet temperature and the preset temperature to obtain the first differential temperature. The controller can also calculate the difference between the inlet temperature and the outlet temperature to obtain the second differential temperature.

[0063] As an example, the inlet temperature can be T 1. The outlet temperature can be T 2. The preset temperature can be... T 0.

[0064] Based on the air inlet temperature T 1 and preset temperature T 0, calculate the first differential temperature according to Formula 1. .

[0065] Formula 1 is: .

[0066] Based on the air inlet temperature T 1 and air outlet temperature T 2. Calculate the second differential temperature according to Formula 2. .

[0067] Formula 2 is: .

[0068] Regarding the process by which the controller substitutes the first differential temperature and the second differential temperature into the objective function to obtain the voltage adjustment coefficient, in some embodiments, the objective function includes a differential function. The differential function is used to characterize the mapping relationship between the first differential temperature, the second differential temperature, and the voltage adjustment coefficient. The controller can substitute the first differential temperature and the second differential temperature into the differential function to obtain the voltage adjustment coefficient. This realizes the calculation of the corresponding voltage adjustment coefficient based on the differential temperature and differential function between the inlet temperature and the preset temperature and the outlet temperature, respectively, thus improving the accuracy of the voltage adjustment coefficient calculation.

[0069] As an example, the first differential temperature can be The second differential temperature can be The expression for the difference function can be given by Formula 3: ,in, η 0 can be a pre-calibrated preset voltage adjustment coefficient. η This is the voltage adjustment coefficient. K p1 and K p2 For example, a constant. K p1 It can be 0.65. K p2 It can be 0.35.

[0070] The first differential temperature can be Second differential temperature Substituting into Formula 3 and calculating, we obtain the voltage adjustment coefficient. η .

[0071] when When >1, η The value is 1.

[0072] η 0 can be calculated using Formula 4, which is: ,in, K p0' and K p0'' It is a constant. The first preset differential temperature is collected in advance. The second preset differential temperature is the temperature that was collected in advance.

[0073] Regarding the process by which the controller substitutes the first differential temperature and the second differential temperature into the objective function to obtain the voltage adjustment coefficient, in some embodiments, the objective function may include an integral function. The integral function can be used to characterize the mapping relationship between the first integral temperature, the second integral temperature and the voltage adjustment coefficient. The first integral temperature can be used to characterize the integral of the first differential temperature within a preset time period, and the second integral temperature can be used to characterize the integral of the second differential temperature within a preset time period.

[0074] The controller can identify the time from the start time of the compressor of the refrigeration equipment to the current time as the preset time. Within the preset time, it integrates the first differential temperature and the second differential temperature to obtain the first integrated temperature and the second integrated temperature. Substituting the first integrated temperature and the second integrated temperature into the integration function, the voltage adjustment coefficient is obtained. This realizes the calculation of the corresponding voltage adjustment coefficient based on the integrated temperature and integration function of the inlet temperature and the preset temperature and the outlet temperature, respectively, thus improving the calculation accuracy of the voltage adjustment coefficient.

[0075] As an example, the first differential temperature can be The second differential temperature can be The preset duration can be t .

[0076] You can set a preset duration t Internal relative to the first differential temperature Integrating, we obtain the first integral temperature. .

[0077] You can set a preset duration t Internal relative to the second differential temperature Integrating, we obtain the second integral temperature. .

[0078] The integral function can be expressed as Formula 5: ,in, η 0' It can be a pre-calibrated preset voltage adjustment coefficient. K i1 and K i2 For example, a constant. K i1 It can be 0.25. K i2 It can be 0.25.

[0079] The first integral temperature can be Second integral temperature Substituting into Formula 5, the voltage adjustment coefficient is obtained. η .

[0080] when When >1, η The value is 1.

[0081] η 0' It can be calculated using Formula Six, which is: ,in, K i0' and K i0''It is a constant.

[0082] Regarding the process by which the controller substitutes the first differential temperature and the second differential temperature into the objective function to obtain the voltage adjustment coefficient, in some embodiments, the objective function may include a differential function. The differential function can be used to characterize the mapping relationship between the first differential temperature, the second differential temperature and the voltage adjustment coefficient. The first differential temperature can be obtained by differential calculation based on the first differential temperature, and the second differential temperature can be obtained by differential calculation based on the second differential temperature.

[0083] The controller can perform differential calculations on the first differential temperature and the second differential temperature respectively to obtain the first differential temperature and the second differential temperature. Substituting the first differential temperature and the second differential temperature into the differential function, the voltage adjustment coefficient is obtained. This realizes the calculation of the corresponding voltage adjustment coefficient based on the differential temperature and differential function of the air inlet temperature with the preset temperature and the air outlet temperature, respectively, thus improving the calculation accuracy of the voltage adjustment coefficient.

[0084] As an example, the first differential temperature can be The second differential temperature can be .

[0085] The first differential temperature can be Perform differential calculations to obtain the first differential temperature. .

[0086] The second differential temperature can be used Perform differential calculations to obtain the second differential temperature. .

[0087] The differential function can be expressed as Equation 7: ,in, η 0'' It can be a pre-calibrated preset voltage adjustment coefficient. K d1 and K d2 It is a constant. K d1 It can be 0.05. K d2 It can be 0.25.

[0088] The first differential temperature can be Second differential temperature Substituting into Formula 7, the voltage adjustment coefficient is obtained. η .

[0089] when When >1, η The value is 1.

[0090] η 0'' It can be calculated using Formula 8, which is: ,in, K d0' and K d0'' It is a constant.

[0091] Regarding the process by which the controller substitutes the first differential temperature and the second differential temperature into the objective function to obtain the voltage adjustment coefficient, in some embodiments, the objective function may include a differential function, an integral function, and a differential function. The differential function can be used to characterize the mapping relationship between the first differential temperature, the second differential temperature, and the voltage adjustment coefficient. The integral function can be used to characterize the mapping relationship between the first integral temperature, the second integral temperature, and the voltage adjustment coefficient. The first integral temperature can be used to characterize the integral of the first differential temperature over a preset time period, and the second integral temperature can be used to characterize the integral of the second differential temperature over a preset time period. The differential function can be used to characterize the mapping relationship between the first differential temperature, the second differential temperature, and the voltage adjustment coefficient. The first differential temperature can be obtained by differential calculation based on the first differential temperature, and the second differential temperature can be obtained by differential calculation based on the second differential temperature.

[0092] The controller can identify the time from the start time of the compressor of the refrigeration equipment to the current time as a preset time. Within the preset time, it integrates the first differential temperature and the second differential temperature to obtain the first integrated temperature and the second integrated temperature. It then differentiates the first differential temperature and the second differential temperature to obtain the first differential temperature and the second differential temperature. Finally, it substitutes the first differential temperature and the second differential temperature into the difference function, the first integrated temperature and the second integrated temperature into the integral function, and the first differential temperature and the second differential temperature into the differential function to obtain the voltage adjustment coefficient. This realizes the calculation of the corresponding voltage adjustment coefficient based on the difference temperature and difference function of the inlet temperature with the preset temperature and the outlet temperature, the integral temperature and integral function of the inlet temperature with the preset temperature and the outlet temperature, and the differential temperature and differential function of the inlet temperature with the preset temperature and the outlet temperature, respectively. This improves the accuracy of the voltage adjustment coefficient calculation.

[0093] As an example, the first differential temperature can be The second differential temperature can be The first integral temperature can be The second integral temperature can be The first differential temperature can be The second differential temperature can be .

[0094] The objective function expression can be Equation Nine: ; in, η 0''' It can be a pre-calibrated preset voltage adjustment coefficient.

[0095] The first differential temperature can be Second differential temperature First integral temperature Second integral temperature First differential temperature Second differential temperature Substituting into Formula 9 for calculation, the voltage adjustment coefficient is obtained. η .

[0096] when When >1, η The value is 1.

[0097] η 0''' It can be calculated using Formula 10, which is: .

[0098] Step 103: Generate the drive voltage of the evaporator fan based on the voltage adjustment coefficient and the maximum operating voltage of the evaporator fan.

[0099] In this embodiment, the controller substitutes the preset temperature, inlet temperature, and outlet temperature into the objective function to obtain the voltage adjustment coefficient. Then, it can generate the drive voltage of the evaporator fan based on the voltage adjustment coefficient and the maximum operating voltage of the evaporator fan.

[0100] Among them, the driving voltage and the voltage adjustment coefficient can be positively correlated. The larger the voltage adjustment coefficient, the larger the driving voltage, and the smaller the voltage adjustment coefficient, the smaller the driving voltage.

[0101] The maximum operating voltage of the evaporator fan can be the maximum output voltage of the controller. The maximum operating voltage of the evaporator fan can also be a voltage set by the user according to actual needs. For example, the maximum operating voltage can be 200 volts, and there is no limit here.

[0102] As an example, the voltage regulation factor can be η The maximum operating voltage of the evaporator fan can be U max It can be adjusted according to the voltage adjustment coefficient. η and maximum operating voltage U max Calculate the driving voltage of the evaporator fan according to Formula 11. U .

[0103] Formula eleven is: U = η × U max .

[0104] Step 104: Output drive voltage to the evaporator fan based on a single-phase line.

[0105] In this embodiment, after the controller generates the drive voltage for the evaporator fan based on the voltage adjustment coefficient and the maximum operating voltage of the evaporator fan, it can output the drive voltage to the evaporator fan based on a single-phase line to drive the evaporator fan to operate. This achieves single-phase line-based operation control of the evaporator fan, eliminating the need for additional control signal lines, reducing the number of connection terminals and connectors arranged within the refrigeration equipment, and reducing material and labor assembly costs. Furthermore, single-phase line-based operation control of the evaporator fan allows evaporator fans of the same specification to be interchanged between refrigeration equipment with different control logics, reducing maintenance costs. Moreover, based on the detected inlet air temperature, outlet air temperature, and preset temperature of the evaporator, the evaporator fan speed is adjusted. Since the inlet and outlet air temperatures of the evaporator are continuously changing, continuous speed regulation of the evaporator fan can be achieved. This overcomes the problem of traditional evaporator fans only being able to switch between two speeds (high and low), leading to a mismatch between the evaporator fan speed and the evaporator's inlet and outlet air temperatures, thus improving the operating efficiency of the refrigeration equipment.

[0106] The operating speed of the evaporator fan can be positively correlated with the driving voltage; the higher the driving voltage, the higher the speed, and the lower the driving voltage, the lower the speed.

[0107] The controller can calculate the speed of the evaporator fan based on its maximum speed, maximum operating voltage, and drive voltage.

[0108] As an example, the maximum speed of the evaporator fan can be R max The maximum operating voltage of the evaporator fan can be U max The driving voltage of the evaporator fan can be U It can be based on the maximum speed R max Maximum operating voltage U max and driving voltage U Calculate the evaporator fan speed according to Formula Twelve. R .

[0109] Formula 12 is: .

[0110] The solution provided in this application collects the inlet and outlet temperatures of the evaporator and substitutes these temperatures into a target function to obtain a voltage adjustment coefficient. The target function characterizes the mapping relationship between the preset temperature, inlet temperature, outlet temperature, and voltage adjustment coefficient. Based on the voltage adjustment coefficient and the maximum operating voltage of the evaporator fan, a drive voltage for the evaporator fan is generated. The drive voltage is positively correlated with the voltage adjustment coefficient. Furthermore, the drive voltage is output to the evaporator fan via a single-phase line, and the fan speed is positively correlated with the drive voltage. This achieves single-phase line-based operation control of the evaporator fan, eliminating the need for additional control signal lines. This reduces the number of connection terminals and connectors within the refrigeration equipment, thus reducing material and assembly costs. Moreover, single-phase line-based operation control allows evaporator fans of the same specification to be interchanged between refrigeration equipment with different control logics, reducing maintenance costs. Furthermore, based on the detected inlet air temperature, outlet air temperature, and preset temperature of the evaporator, the speed of the evaporator fan is adjusted. Since the inlet air temperature and outlet air temperature of the evaporator are continuously changing, the speed of the evaporator fan can be continuously adjusted. This can suppress the problem that traditional evaporator fans can only switch between two speeds, which leads to a mismatch between the speed of the evaporator fan and the inlet air temperature and outlet air temperature of the evaporator. This is beneficial to improving the operating energy efficiency of refrigeration equipment.

[0111] Please see Figure 3 This illustrates a flowchart of an evaporator fan operation control method according to another embodiment of this application. In a specific embodiment, the evaporator fan operation control method can be applied to, for example... Figure 1 The controller 400 in the refrigeration equipment 10 shown below will be used as an example to explain... Figure 3 The process shown is described in detail. The operation control method of the evaporator fan may include the following steps 201 to 205.

[0112] Step 201: Determine whether the freezer door is closed.

[0113] In this embodiment, during the operation of the refrigeration equipment, the controller can determine whether the freezer door is closed.

[0114] The refrigeration equipment may also include a permanent magnet and a Hall sensor. The permanent magnet can be embedded in the door of the freezer and move with the door. The Hall sensor can be installed on the freezer body relative to the door and is used to detect the magnetic field strength of the permanent magnet.

[0115] The controller can send a second acquisition command to the Hall sensor. The Hall sensor responds to the second acquisition command, detects the magnetic field strength of the permanent magnet, and sends the detected magnetic field strength to the controller. The controller receives the magnetic field strength returned by the Hall sensor and determines whether the freezer door is closed based on the magnetic field strength.

[0116] When the magnetic field strength is greater than or equal to the magnetic field strength threshold, the freezer door is determined to be closed; when the magnetic field strength is less than the magnetic field strength threshold, the freezer door is determined to be open.

[0117] The magnetic field strength threshold can be used to characterize the minimum magnetic field strength collected by the Hall sensor when the freezer door is closed. The magnetic field strength threshold can be set by the user according to actual needs, and there is no limitation here.

[0118] Step 202: With the freezer door closed, collect the inlet and outlet temperatures.

[0119] In this embodiment, when the freezer door is closed, the controller can collect the inlet and outlet temperatures of the evaporator. This allows the controller to collect the inlet and outlet temperatures even when the freezer door is detected to be closed. This avoids the inaccuracy of outlet temperature collection caused by the diffusion of warmer air from outside the freezer to the evaporator outlet when the door is open, thus improving the accuracy of outlet temperature collection.

[0120] Step 203: Substitute the preset temperature, inlet temperature, and outlet temperature into the objective function to obtain the voltage adjustment coefficient.

[0121] Step 204: Generate the drive voltage of the evaporator fan based on the voltage adjustment coefficient and the maximum operating voltage of the evaporator fan.

[0122] Step 205: Output drive voltage to the evaporator fan based on the single-phase line.

[0123] In this embodiment, steps 203, 204 and 205 can be found in the corresponding steps in the previous embodiments, and will not be repeated here.

[0124] In some implementations, when the freezer door is open, the controller can stop the evaporator fan. This allows the evaporator fan to stop operating when the freezer door is detected to be open, which slows down the convection exchange rate between the cold air that has exchanged heat with the evaporator and the hot air outside the freezer. This reduces the rate at which cold air dissipates to the outside of the freezer and helps improve the freezer's energy efficiency.

[0125] The controller can stop outputting drive voltage to the evaporator fan based on a single-phase line, thereby stopping the evaporator fan from running.

[0126] The solution provided in this embodiment determines whether the freezer door is closed. If the door is closed, it collects the inlet and outlet temperatures. Substituting these temperatures (preset, inlet, and outlet) into a target function yields a voltage adjustment coefficient. Based on this coefficient and the maximum operating voltage of the evaporator fan, it generates the drive voltage for the evaporator fan and outputs this voltage to the fan via a single-phase line. This achieves single-phase line-based control of the evaporator fan, eliminating the need for additional control signal lines. This reduces the number of connection terminals and connectors within the refrigeration equipment, thus lowering material and assembly costs. Furthermore, single-phase line control allows evaporator fans of the same specifications to be interchangeable between refrigeration units with different control logics, reducing maintenance costs. Furthermore, based on the detected inlet air temperature, outlet air temperature, and preset temperature of the evaporator, the speed of the evaporator fan is adjusted. Since the inlet air temperature and outlet air temperature of the evaporator are continuously changing, the speed of the evaporator fan can be continuously adjusted. This can suppress the problem that traditional evaporator fans can only switch between two speeds, which leads to a mismatch between the speed of the evaporator fan and the inlet air temperature and outlet air temperature of the evaporator. This is beneficial to improving the operating energy efficiency of refrigeration equipment.

[0127] Furthermore, by collecting the inlet and outlet temperatures when the freezer door is detected to be closed, the system can prevent the high-temperature air from outside the freezer from diffusing to the evaporator outlet when the door is open, thus avoiding inaccurate outlet temperature collection and improving the accuracy of outlet temperature collection.

[0128] Please see Figure 4 This illustrates an embodiment of an evaporator fan operation control device 500 provided in this application. The evaporator fan operation control device 500 can be applied to, for example... Figure 1 The controller 400 in the refrigeration equipment 10 shown below will be used as an example to explain... Figure 4 The evaporator fan operation control device 500 shown will be described in detail. The evaporator fan operation control device 500 may include a data acquisition module 501, a data input module 502, a data generation module 503, and an output module 504.

[0129] The acquisition module 501 can be used to acquire the inlet and outlet temperatures of the evaporator; the substitution module 502 can be used to substitute the preset temperature, inlet temperature, and outlet temperature into the objective function to obtain the voltage adjustment coefficient. The objective function can be used to characterize the mapping relationship between the preset temperature, inlet temperature, outlet temperature, and voltage adjustment coefficient. The voltage adjustment coefficient can be used to characterize the proportion of adjusting the drive voltage of the evaporator fan according to the cooling temperature difference of the refrigeration equipment. The cooling temperature difference can include a first difference temperature between the inlet temperature and the preset temperature and a second difference temperature between the inlet temperature and the outlet temperature. The first difference temperature can be used to characterize the difference between the inlet temperature and the preset temperature, and the second difference temperature can be used to characterize the difference between the inlet temperature and the outlet temperature; the generation module 503 can be used to generate the drive voltage based on the voltage adjustment coefficient and the maximum operating voltage of the evaporator fan. The drive voltage and the voltage adjustment coefficient can be positively correlated; the output module 504 can be used to output the drive voltage to the evaporator fan based on a single-phase line. The speed of the evaporator fan can be positively correlated with the drive voltage.

[0130] In some implementations, the substitution module 502 may include a calculation unit and a substitution unit.

[0131] The calculation unit can be used to calculate the first differential temperature between the inlet temperature and the preset temperature, and the second differential temperature between the inlet temperature and the outlet temperature; the substitution unit can be used to substitute the first differential temperature and the second differential temperature into the objective function to obtain the voltage adjustment coefficient.

[0132] In some implementations, the objective function may include a difference function, which can be used to characterize the mapping relationship between the first differential temperature, the second differential temperature and the voltage adjustment coefficient, and the substitution unit may include a first substitution sub-unit.

[0133] The first sub-unit can be used to substitute the first and second differential temperatures into the differential function to obtain the voltage adjustment coefficient.

[0134] In some implementations, the objective function may include an integral function, which may be used to characterize the mapping relationship between the first integral temperature, the second integral temperature and the voltage adjustment coefficient. The first integral temperature may be used to characterize the integral of the first differential temperature within a preset time period, and the second integral temperature may be used to characterize the integral of the second differential temperature within a preset time period. The substitution unit may also include an identification subunit, an integration subunit and a second substitution subunit.

[0135] The identification subunit can be used to identify the time from the start time of the compressor of the refrigeration equipment to the current time as a preset time; the integration subunit can be used to integrate the first differential temperature and the second differential temperature respectively within the preset time to obtain the first integrated temperature and the second integrated temperature; the second substitution subunit can be used to substitute the first integrated temperature and the second integrated temperature into the integration function to obtain the voltage adjustment coefficient.

[0136] In some implementations, the objective function may include a differential function, which can be used to characterize the mapping relationship between the first differential temperature, the second differential temperature and the voltage adjustment coefficient. The first differential temperature may be obtained by differential calculation based on the first differential temperature, and the second differential temperature may be obtained by differential calculation based on the second differential temperature. The substitution unit may also include a differential calculation subunit and a third substitution subunit.

[0137] The differential calculation subunit can be used to perform differential calculations on the first differential temperature and the second differential temperature respectively to obtain the first differential temperature and the second differential temperature; the third substitution subunit can be used to substitute the first differential temperature and the second differential temperature into the differential function to obtain the voltage adjustment coefficient.

[0138] In some implementations, the objective function may include a difference function, an integral function, and a differential function; the difference function may be used to characterize the mapping relationship between the first differential temperature, the second differential temperature, and the voltage adjustment coefficient; the integral function may be used to characterize the mapping relationship between the first integral temperature, the second integral temperature, and the voltage adjustment coefficient, wherein the first integral temperature may be used to characterize the integral of the first differential temperature over a preset time period, and the second integral temperature may be used to characterize the integral of the second differential temperature over a preset time period; the differential function may be used to characterize the mapping relationship between the first differential temperature, the second differential temperature, and the voltage adjustment coefficient, wherein the first differential temperature may be obtained by differential calculation of the first differential temperature, and the second differential temperature may be obtained by differential calculation of the second differential temperature; the substitution unit may further include an identification subunit, an integration subunit, a differential calculation subunit, and a fourth substitution subunit.

[0139] The identification subunit can be used to identify the duration from the start time of the compressor of the refrigeration equipment to the current time as a preset duration; the integration subunit can be used to integrate the first differential temperature and the second differential temperature within the preset duration to obtain the first integrated temperature and the second integrated temperature; the differential calculation subunit can be used to perform differential calculations on the first differential temperature and the second differential temperature to obtain the first differential temperature and the second differential temperature; the fourth substitution subunit can be used to substitute the first differential temperature and the second differential temperature into the difference function, the first integrated temperature and the second integrated temperature into the integration function, and the first differential temperature and the second differential temperature into the differential function to obtain the voltage adjustment coefficient.

[0140] The solution provided in this embodiment collects the inlet and outlet temperatures of the evaporator and substitutes these temperatures into a target function to obtain a voltage adjustment coefficient. The target function characterizes the mapping relationship between the preset temperature, inlet temperature, outlet temperature, and voltage adjustment coefficient. Based on the voltage adjustment coefficient and the maximum operating voltage of the evaporator fan, a drive voltage for the evaporator fan is generated. The drive voltage is positively correlated with the voltage adjustment coefficient. Furthermore, the drive voltage is output to the evaporator fan via a single-phase line, and the fan speed is positively correlated with the drive voltage. This achieves single-phase line-based operation control of the evaporator fan, eliminating the need for additional control signal lines. This reduces the number of connection terminals and connectors within the refrigeration equipment, thus reducing material and assembly costs. Moreover, single-phase line-based operation control allows evaporator fans of the same specification to be interchanged between refrigeration equipment with different control logics, reducing maintenance costs. Furthermore, based on the detected inlet air temperature, outlet air temperature, and preset temperature of the evaporator, the speed of the evaporator fan is adjusted. Since the inlet air temperature and outlet air temperature of the evaporator are continuously changing, the speed of the evaporator fan can be continuously adjusted. This can suppress the problem that traditional evaporator fans can only switch between two speeds, which leads to a mismatch between the speed of the evaporator fan and the inlet air temperature and outlet air temperature of the evaporator. This is beneficial to improving the operating energy efficiency of refrigeration equipment.

[0141] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For device embodiments, since they are basically similar to method embodiments, the description is relatively simple; relevant parts can be referred to in the descriptions of the method embodiments. Any processing method described in the method embodiments can be implemented in the device embodiments through corresponding processing modules, and will not be elaborated upon further in the device embodiments.

[0142] Furthermore, the functional modules in the various embodiments of this application can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0143] Please refer to Figure 5 This diagram illustrates a structural block diagram of a computer-readable storage medium provided in an embodiment of this application. The computer-readable storage medium 600 stores program code 601, which can be called by a processor to execute the methods described in the above method embodiments.

[0144] The computer-readable storage medium 600 may be an electronic memory such as flash memory, EEPROM (Electrically Erasable Programmable Read-Only Memory), EPROM, hard disk, or ROM. Optionally, the computer-readable storage medium 600 includes a non-transitory computer-readable storage medium. The computer-readable storage medium 600 has storage space for program code 601 that performs any of the method steps described above. This program code can be read from or written to one or more computer program products. The program code 601 may be compressed, for example, in a suitable form.

[0145] Please refer to Figure 6 This diagram illustrates a structural block diagram of a computer program product 700 provided in an embodiment of this application. The computer program product 700 includes a computer program / instructions 701, which is stored in a computer-readable storage medium of a computer device. When the computer program product 700 runs on the computer device, the processor of the computer device reads the computer program / instructions 701 from the computer-readable storage medium, and executes the computer program / instructions 701, causing the computer device to perform the methods described in the above method embodiments.

[0146] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A refrigeration device, characterized in that, include: Evaporator; An evaporator fan is used to draw out the airflow after heat exchange with the evaporator; The controller, a single-phase line connected to the evaporator fan, is configured as follows: Collect the inlet and outlet temperatures of the evaporator; Substituting the preset temperature, the inlet temperature, and the outlet temperature into the objective function yields the voltage adjustment coefficient. The objective function characterizes the mapping relationship between the preset temperature, the inlet temperature, the outlet temperature, and the voltage adjustment coefficient. The voltage adjustment coefficient characterizes the proportion by which the driving voltage of the evaporator fan is adjusted according to the cooling temperature difference of the refrigeration equipment. The cooling temperature difference includes a first differential temperature between the inlet temperature and the preset temperature and a second differential temperature between the inlet temperature and the outlet temperature. The first differential temperature characterizes the difference between the inlet temperature and the preset temperature, and the second differential temperature characterizes the difference between the inlet temperature and the outlet temperature. The driving voltage is generated based on the voltage adjustment coefficient and the maximum operating voltage of the evaporator fan, and the driving voltage is positively correlated with the voltage adjustment coefficient. The driving voltage is output to the evaporator based on the single-phase line, and the rotational speed of the evaporator is positively correlated with the driving voltage. The objective function includes a difference function, an integral function, and a differential function. The controller is configured to substitute the preset temperature, the inlet temperature, and the outlet temperature into the objective function to obtain the voltage adjustment coefficient, including: the controller is configured to: Calculate the first temperature difference between the air inlet temperature and the preset temperature, and the second temperature difference between the air inlet temperature and the air outlet temperature. The duration from the start time of the compressor of the refrigeration equipment to the current time is identified as the preset duration; The first differential temperature and the second differential temperature are integrated within the preset time period to obtain the first integrated temperature and the second integrated temperature. Differential calculations are performed on the first differential temperature and the second differential temperature respectively to obtain the first differential temperature and the second differential temperature; Substituting the first differential temperature and the second differential temperature into the differential function, substituting the first integral temperature and the second integral temperature into the integral function, and substituting the first differential temperature and the second differential temperature into the differential function, the voltage adjustment coefficient is obtained. Wherein, the difference function is used to characterize the mapping relationship between the first differential temperature, the second differential temperature and the voltage adjustment coefficient; the integral function is used to characterize the mapping relationship between the first integral temperature, the second integral temperature and the voltage adjustment coefficient, wherein the first integral temperature is used to characterize the integral of the first differential temperature over a preset time period, and the second integral temperature is used to characterize the integral of the second differential temperature over a preset time period; the differential function is used to characterize the mapping relationship between the first differential temperature, the second differential temperature and the voltage adjustment coefficient, wherein the first differential temperature is obtained by differential calculation of the first differential temperature, and the second differential temperature is obtained by differential calculation of the second differential temperature.

2. The refrigeration equipment according to claim 1, characterized in that, The refrigeration equipment is a freezer, and the controller collects the inlet and outlet temperatures of the evaporator and is configured as follows: With the freezer door closed, the inlet temperature and the outlet temperature are collected.

3. The refrigeration equipment according to claim 2, characterized in that, The controller is also configured to: When the freezer door is open, the evaporator fan is stopped.

4. A method for controlling the operation of an evaporator fan, characterized in that, This is applied to refrigeration equipment, which includes an evaporator and an evaporation fan, wherein the evaporation fan is used to draw out the airflow after heat exchange with the evaporator; The evaporator fan operation control method includes: Collect the inlet and outlet temperatures of the evaporator; Substituting the preset temperature, the inlet temperature, and the outlet temperature into the objective function yields the voltage adjustment coefficient. The objective function characterizes the mapping relationship between the preset temperature, the inlet temperature, the outlet temperature, and the voltage adjustment coefficient. The voltage adjustment coefficient characterizes the proportion by which the driving voltage of the evaporator fan is adjusted according to the cooling temperature difference of the refrigeration equipment. The cooling temperature difference includes a first differential temperature between the inlet temperature and the preset temperature and a second differential temperature between the inlet temperature and the outlet temperature. The first differential temperature characterizes the difference between the inlet temperature and the preset temperature, and the second differential temperature characterizes the difference between the inlet temperature and the outlet temperature. The driving voltage is generated based on the voltage adjustment coefficient and the maximum operating voltage of the evaporator fan, and the driving voltage is positively correlated with the voltage adjustment coefficient. The driving voltage is output to the evaporator fan based on a single-phase line, and the rotational speed of the evaporator fan is positively correlated with the driving voltage. The objective function includes a difference function, an integral function, and a differential function. Substituting the preset temperature, the inlet temperature, and the outlet temperature into the objective function to obtain the voltage adjustment coefficient includes: Calculate the first temperature difference between the air inlet temperature and the preset temperature, and the second temperature difference between the air inlet temperature and the air outlet temperature. The duration from the start time of the compressor of the refrigeration equipment to the current time is identified as the preset duration; The first differential temperature and the second differential temperature are integrated within the preset time period to obtain the first integrated temperature and the second integrated temperature. Differential calculations are performed on the first differential temperature and the second differential temperature respectively to obtain the first differential temperature and the second differential temperature; Substituting the first differential temperature and the second differential temperature into the differential function, substituting the first integral temperature and the second integral temperature into the integral function, and substituting the first differential temperature and the second differential temperature into the differential function, the voltage adjustment coefficient is obtained. Wherein, the difference function is used to characterize the mapping relationship between the first differential temperature, the second differential temperature and the voltage adjustment coefficient; the integral function is used to characterize the mapping relationship between the first integral temperature, the second integral temperature and the voltage adjustment coefficient, wherein the first integral temperature is used to characterize the integral of the first differential temperature over a preset time period, and the second integral temperature is used to characterize the integral of the second differential temperature over a preset time period; the differential function is used to characterize the mapping relationship between the first differential temperature, the second differential temperature and the voltage adjustment coefficient, wherein the first differential temperature is obtained by differential calculation of the first differential temperature, and the second differential temperature is obtained by differential calculation of the second differential temperature.

5. A computer program product, characterized in that, The computer program product includes: program code, which can be called by a processor to execute the evaporator fan operation control method as described in claim 4.

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