Air-cooled refrigeration equipment and defrosting control method thereof

Abstract

The invention discloses air-cooled refrigeration equipment and a defrosting control method thereof.The method comprises the steps that when defrosting of a first refrigeration loop is completed, the first refrigeration loop is controlled to be switched to a turn-off state; controlling a compressor to start so as to drive a second refrigerating loop to circularly refrigerate; and when it is determined that the second refrigerating circuit meets the first defrosting condition, the heater is controlled to conduct heating so as to conduct heating defrosting on the second refrigerating circuit. According to the method, the evaporator of the air-cooled refrigeration equipment is arranged to be an upper independent refrigeration loop and a lower independent refrigeration loop, after defrosting of the first refrigeration loop of the upper section of the evaporator is completed, circulation of the first refrigeration loop is turned off, and the second refrigeration loop of the lower section of the evaporator is controlled to conduct circulation refrigeration; according to the air-cooled refrigeration equipment, residual water vapor in the refrigeration air duct can be captured to the surface of the second refrigeration loop for frosting, the second refrigeration loop after circulating refrigeration is heated and defrosted, the residual water vapor in the refrigeration air duct can be effectively removed, the defrosting period of the evaporator can be prolonged, and the effective refrigeration period of the air-cooled refrigeration equipment can be prolonged.

Description

Technical Field

[0001] This application belongs to the field of refrigeration technology, and in particular relates to an air-cooled refrigeration device and its defrosting control method. Background Technology

[0002] Currently, after defrosting, water vapor remains in the air duct of air-cooled refrigeration equipment. When refrigeration resumes, the water vapor will frost again on the evaporator surface, which will shorten the defrosting cycle of the evaporator and thus shorten the effective refrigeration cycle of the air-cooled refrigeration equipment. Summary of the Invention

[0003] In view of this, embodiments of this application provide an air-cooled refrigeration device and a defrosting control method thereof to extend the effective refrigeration cycle of the air-cooled refrigeration device.

[0004] In a first aspect, embodiments of this application provide an air-cooled refrigeration device, including: The enclosure contains a refrigeration chamber. A cooling air duct is used to deliver cold air to the cooling room; An evaporator installed inside the refrigeration duct for exchanging heat with the gas inside the refrigeration duct. The evaporator includes a first refrigeration circuit and a second refrigeration circuit. The first refrigeration circuit is located at the upper part of the refrigeration duct, and the second refrigeration circuit is located at the lower part of the refrigeration duct. A compressor is used to drive the first refrigeration circuit and the second refrigeration circuit to circulate refrigeration, wherein the first refrigeration circuit and the second refrigeration circuit are connected in parallel to the compressor; A heater is installed below the second refrigeration circuit to heat and defrost the first and second refrigeration circuits. And a controller connected to the compressor and the heater, the controller being configured to: When the first refrigeration circuit completes defrosting, control the first refrigeration circuit to switch to the off state; The compressor is started to drive the second refrigeration circuit to circulate refrigeration. When it is determined that the second refrigeration circuit meets the first defrosting condition, the heater is controlled to heat the second refrigeration circuit for defrosting.

[0005] The solution provided in this application sets the evaporator of the air-cooled refrigeration equipment as two independent refrigeration circuits, one above the other. After defrosting the first refrigeration circuit in the upper section of the evaporator, the flow of the first refrigeration circuit is shut off, and the second refrigeration circuit in the lower section of the evaporator is controlled to circulate and refrigerate. This can capture the residual water vapor in the refrigeration duct and frost it on the surface of the second refrigeration circuit. The second refrigeration circuit after circulating and refrigerating is then heated and defrosted, which can effectively remove the residual water vapor in the refrigeration duct, extend the defrosting cycle of the evaporator, and help extend the effective refrigeration cycle of the air-cooled refrigeration equipment.

[0006] In some optional embodiments, the controller is further configured to: Obtain the temperature of the first air duct of the cooling air duct; When the temperature of the first air duct is greater than or equal to the first temperature threshold, the heater is controlled to stop heating; Return to the step of controlling the compressor to start and subsequent steps until the preset conditions are met, and control the first refrigeration circuit to switch to the flow state; The compressor is controlled to start, so as to drive the first refrigeration circuit and the second refrigeration circuit to circulate refrigeration.

[0007] The solution provided in this embodiment cyclically controls the second refrigeration circuit for refrigeration and defrosting, which can cyclically remove residual water vapor in the refrigeration duct, thus helping to further extend the effective refrigeration cycle of the air-cooled refrigeration equipment.

[0008] In some optional embodiments, the controller is further configured to: Before executing the step of returning to execute the control of the compressor to start and subsequent steps, the controller is further configured to: Determine whether the preset conditions are met; If it is determined that the preset conditions are not met, return to the step of controlling the compressor to start and subsequent steps.

[0009] The solution provided in this embodiment, when it is determined that there is a lot of residual water vapor in the cooling duct, cyclically controls the second cooling circuit to perform cooling and defrosting, which can avoid energy waste caused by cyclically controlling the second cooling circuit to perform cooling and defrosting when there is little residual water vapor in the cooling duct, and improves the energy utilization rate of the system.

[0010] In some optional embodiments, the controller determines whether the preset condition is met by: Obtain the humidity of the first air duct of the cooling air duct; Obtain the cumulative frosting amount of the second refrigeration circuit; When the humidity of the first air duct is less than or equal to the first humidity threshold, and the cumulative frost amount is greater than or equal to the frost amount threshold, it is determined that the preset condition is met. When the humidity of the first air duct is less than the first humidity threshold, and / or the cumulative frost amount is less than the frost amount threshold, it is determined that the preset condition is not met.

[0011] The solution provided in this embodiment judges the amount of residual water vapor in the cooling duct based on the duct humidity and the amount of cumulative frost, thereby improving the accuracy of judging the amount of residual water vapor in the cooling duct.

[0012] In some optional embodiments, the controller is configured to acquire the cumulative frosting amount of the second refrigeration circuit as follows: The evaporation temperature, bottom area, trapping coefficient of the evaporator, and dew point temperature of the refrigeration duct are obtained. The trapping coefficient is used to characterize the length of water vapor effectively trapped by the evaporator per unit time and per unit temperature difference. The cumulative amount of frost is calculated based on the ice density, the evaporation temperature, the bottom area, the trapping coefficient, and the dew point temperature.

[0013] The solution provided in this embodiment calculates the cumulative frost amount of the second refrigeration circuit based on the ice density, evaporation temperature, bottom area, trapping coefficient, and dew point temperature, thereby improving the accuracy of the calculation of the cumulative frost amount of the second refrigeration circuit.

[0014] In some optional embodiments, the controller determines whether the preset condition is met by: Get the number of times the execution returned; When the number of returns is greater than or equal to the number of returns threshold, it is determined that the preset condition is met; When the number of returns is less than the number of times, it is determined that the preset condition is not met.

[0015] The solution provided in this embodiment judges the amount of residual water vapor in the refrigeration duct based on the number of cycles of refrigeration and defrosting in the second refrigeration circuit, thereby improving the accuracy of judging the amount of residual water vapor in the refrigeration duct.

[0016] In some optional embodiments, before the controller determines that the preset condition is met when the number of returns is greater than or equal to a threshold, the controller is further configured to: Obtain the humidity of the second air duct of the refrigeration air duct when the first refrigeration circuit completes defrosting; The number of times threshold is calculated based on the set frost amount of the evaporator, the set humidity of the cooling duct, and the humidity of the second duct.

[0017] The solution provided in this embodiment calculates the cycle number threshold based on the set frost amount, set humidity, and second air duct temperature, thereby improving the accuracy of the cycle number threshold calculation.

[0018] In some optional embodiments, the air-cooled refrigeration equipment further includes a first fan, which is installed at the top of the refrigeration duct and used to control the airflow within the refrigeration duct to the evaporator; before the controller controls the heater to heat the device when it determines that the second refrigeration circuit meets the first defrosting condition, it is further configured to: The first fan is turned on to control the airflow in the cooling duct to the evaporator; After determining that the second refrigeration circuit meets the first defrosting condition, the controller controls the heater to heat up and is further configured to: Control the first fan to shut down.

[0019] The solution provided in this embodiment controls the fan to blow water vapor from the upper part of the cooling duct toward the second cooling circuit during the cooling cycle, which can accelerate the removal of residual water vapor in the cooling duct and improve the efficiency of removing residual water vapor in the cooling duct.

[0020] In some optional embodiments, the controller is further configured to: before controlling the first refrigeration circuit to switch to the off state after defrosting of the first refrigeration circuit is completed. Obtain the temperature of the second air duct of the cooling air duct; The defrosting status of the first refrigeration circuit is determined based on the temperature of the second air duct.

[0021] The solution provided in this embodiment determines whether the defrosting of the first refrigeration circuit is complete based on the duct temperature of the refrigeration duct, thereby improving the accuracy of determining whether the defrosting of the first refrigeration circuit is complete.

[0022] Secondly, embodiments of this application provide a defrosting control method for an air-cooled refrigeration device. The air-cooled refrigeration device includes a housing with a refrigeration chamber, a refrigeration duct for supplying cold air to the refrigeration chamber, an evaporator, a compressor, and a heater. The evaporator includes a first refrigeration circuit and a second refrigeration circuit. The first refrigeration circuit is disposed at the upper part of the refrigeration duct, and the second refrigeration circuit is disposed at the lower part of the refrigeration duct. The first refrigeration circuit and the second refrigeration circuit are connected in parallel to the compressor, which drives the first refrigeration circuit and the second refrigeration circuit to circulate refrigeration. The heater is installed below the second refrigeration circuit for heating and defrosting the first refrigeration circuit and the second refrigeration circuit. The defrosting control method includes: When the first refrigeration circuit completes defrosting, control the first refrigeration circuit to switch to the off state; The compressor is started to drive the second refrigeration circuit to circulate refrigeration. When it is determined that the second refrigeration circuit meets the first defrosting condition, the heater is controlled to heat the second refrigeration circuit for defrosting.

[0023] Thirdly, embodiments of this application provide a computer-readable storage medium storing program code, which can be called by a processor to execute the defrosting control method for the air-cooled refrigeration equipment provided in the second aspect above.

[0024] Fourthly, embodiments of this application provide a computer program product that, when run on a computer device, causes the computer device to execute the defrosting control method for the air-cooled refrigeration equipment provided in the second aspect above.

[0025] It is understood that the beneficial effects of the second to fourth 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 A schematic diagram of a structure of an air-cooled refrigeration device provided in an embodiment of this application is shown.

[0028] Figure 2 A schematic diagram of the structure of an evaporator of an air-cooled refrigeration device provided in an embodiment of this application is shown.

[0029] Figure 3 A schematic flowchart of a defrosting control method for an air-cooled refrigeration device provided in an embodiment of this application is shown.

[0030] Figure 4 This paper illustrates another flowchart of the defrosting control method for an air-cooled refrigeration device provided in an embodiment of this application.

[0031] Figure 5 This application illustrates a computer-readable storage medium for storing or carrying program code that implements a defrosting control method for an air-cooled refrigeration device according to an embodiment of this application.

[0032] Figure 6This application provides a computer program product for storing or carrying program code that implements the defrosting control method for an air-cooled refrigeration device according to an embodiment 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] Currently, after defrosting, water vapor remains in the air duct of air-cooled refrigeration equipment. When refrigeration resumes, the water vapor will frost again on the evaporator surface, which will shorten the defrosting cycle of the evaporator and thus shorten the effective refrigeration cycle of the air-cooled refrigeration equipment.

[0039] To address the aforementioned problems, this application provides an air-cooled refrigeration device and its defrosting control method. The air-cooled refrigeration device includes a housing, a refrigeration duct, an evaporator, a compressor, a heater, and a controller. The housing contains a refrigeration chamber. The refrigeration duct delivers cold air to the refrigeration chamber. The evaporator is installed within the refrigeration duct for heat exchange with the gas within the refrigeration duct. The evaporator includes a first refrigeration circuit and a second refrigeration circuit. The first refrigeration circuit is located at the upper part of the refrigeration duct, and the second refrigeration circuit is located at the lower part of the refrigeration duct. The compressor drives the first and second refrigeration circuits to circulate refrigeration. The first and second refrigeration circuits are connected in parallel to the compressor. The heater is installed below the second refrigeration circuit for heating and defrosting both circuits. The controller is connected to the compressor and the heater. The controller is configured to: control the first refrigeration circuit to switch to a shut-off state when defrosting of the first refrigeration circuit is complete; control the compressor to start to drive the second refrigeration circuit to circulate refrigeration; and control the heater to heat the second refrigeration circuit when the first defrosting condition is met, thereby defrosting the second refrigeration circuit.

[0040] By setting the evaporator of the air-cooled refrigeration equipment as two independent refrigeration circuits, after defrosting the first refrigeration circuit in the upper section of the evaporator, the flow of the first refrigeration circuit is shut off, and the second refrigeration circuit in the lower section of the evaporator is controlled to circulate refrigeration. This can capture the residual water vapor in the refrigeration duct and frost it on the surface of the second refrigeration circuit. The second refrigeration circuit after circulating refrigeration is then heated to defrost, which can effectively remove the residual water vapor in the refrigeration duct, extend the defrosting cycle of the evaporator, and help extend the effective refrigeration cycle of the air-cooled 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 1 The illustration shows an application scenario diagram of the air-cooled refrigeration equipment 10 provided in the embodiments of this application. The air-cooled refrigeration equipment 10 may include a housing 11, a refrigeration duct 12, an evaporator 13, a compressor 14, a heater 15, and a controller 16.

[0043] In this embodiment of the application, a refrigeration compartment 111 may be provided inside the housing 11. As an example, the refrigeration compartment 111 may include a freezer compartment 1111 and a refrigerator compartment 1112.

[0044] In this embodiment, the refrigeration duct 12 can be used to deliver cold air to the refrigeration compartment 111. As an example, the refrigeration duct 12 can be used to deliver cold air to both the freezer compartment 1111 and the refrigerator compartment 1112.

[0045] In this embodiment, the evaporator 13 can be installed inside the cooling duct 12 and used to exchange heat with the gas inside the cooling duct 12.

[0046] The evaporator 13 may include a first refrigeration circuit 131 and a second refrigeration circuit 132, such as Figure 2 As shown, the first refrigeration circuit 131 can be disposed at the upper part of the refrigeration duct 12, and the second refrigeration circuit 132 can be disposed at the lower part of the refrigeration duct 12. The first refrigeration circuit 131 and the second refrigeration circuit 132 can be connected in parallel.

[0047] In some embodiments, the evaporator 13 may also include a conduit 133, through which the first refrigeration circuit 131 can be connected in parallel with the second refrigeration circuit 132.

[0048] In some embodiments, the conduit 133 may include a first inlet pipe 1331, a second inlet pipe 1332, a third inlet pipe 1333, a first return pipe 1334, a second return pipe 1335, and a third return pipe 1336.

[0049] The first liquid inlet pipe 1331 can be connected to the first liquid return pipe 1334, and together with the first liquid return pipe 1334, they form the first refrigeration circuit 131.

[0050] The second liquid inlet pipe 1332 can be connected to the second liquid return pipe 1335, and together with the second liquid return pipe 1335, they form the second refrigeration circuit 132.

[0051] The first liquid inlet pipe 1331 and the second liquid inlet pipe 1332 can be connected in parallel to the third liquid inlet pipe 1333. The third liquid inlet pipe 1333 can be used to introduce refrigerant into the first refrigeration circuit 131 and the second refrigeration circuit 132 respectively.

[0052] The first return pipe 1334 and the second return pipe 1335 can be connected in parallel to the third return pipe 1336. The third return pipe 1336 can be used to export refrigerant from the first refrigeration circuit 131 and the second refrigeration circuit 132 respectively.

[0053] In some embodiments, the evaporator 13 may further include cooling fins 134, which may be mounted on the surfaces of the first cooling circuit 131 and the second cooling circuit 132.

[0054] In some embodiments, the cooling fin 134 may include a first cooling fin 1341 and a second cooling fin 1342. The first cooling fin 1341 may be mounted on the surface of the first cooling circuit 131, and the second cooling fin 1342 may be mounted on the surface of the second cooling circuit 132.

[0055] The installation density of the first cooling fin 1341 can be greater than that of the second cooling fin 1342.

[0056] In some embodiments, the evaporator 13 may also include a solenoid valve 135, which may be installed on the first liquid inlet pipe 1331 and may be used to switch the circuit state of the first refrigeration circuit 131.

[0057] The circuit state can include either the off state or the open state, etc., without limitation here.

[0058] In this embodiment of the application, the compressor 14 can be connected to the first refrigeration circuit 131 and the second refrigeration circuit 132, and is used to drive the first refrigeration circuit 131 and the second refrigeration circuit 132 to circulate refrigeration.

[0059] The first refrigeration circuit 131 and the second refrigeration circuit 132 can be connected in parallel to the compressor 14.

[0060] In the embodiments of this application, such as Figure 1 As shown, heater 15 can be installed inside the refrigeration duct 12. Heater 15 is located below the second refrigeration circuit 132. Heater 15 can heat and defrost the first refrigeration circuit 131 and the second refrigeration circuit 132.

[0061] In this embodiment, the controller 16 can be communicatively connected to the solenoid valve 135, the compressor 14, and the heater 15, and is used to control the solenoid valve 135, the compressor 14, and the heater 15.

[0062] The controller 16 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.

[0063] In some embodiments, the air-cooled refrigeration device 10 may further include a first fan 17, which may be installed on the top of the refrigeration duct 12 and used to control the airflow in the refrigeration duct 12 to the first refrigeration circuit 131 and the second refrigeration circuit 132.

[0064] In some embodiments, the air-cooled refrigeration equipment 10 may further include a second fan 18, which may be used to transport cold air in the refrigeration duct 12 to the freezer compartment 1111 and the refrigerator compartment 1112, and to introduce air from the freezer compartment 1111 and the refrigerator compartment 1112 into the refrigeration duct 12.

[0065] The second fan 18 may include a first supply fan 181, a first return fan 182, a second supply fan 183, and a second return fan 184.

[0066] The first air supply fan 181 can be used to deliver cold air from the refrigeration duct 12 to the freezer compartment 1111, and the first return air fan 182 can be used to introduce air from the freezer compartment 1111 into the refrigeration duct 12.

[0067] The second air supply fan 183 can be used to deliver cold air from the refrigeration duct 12 to the refrigerator compartment 1112, and the second return air fan 184 can be used to introduce air from the refrigerator compartment 1112 into the refrigeration duct 12.

[0068] In some embodiments, the air-cooled refrigeration device 10 may also include a temperature and humidity sensor 19, which may be located at the upper part of the refrigeration duct 12 and close to the first refrigeration circuit 131.

[0069] The temperature and humidity sensor 19 can be communicatively connected to the controller 16, and the controller 16 can be used to control the temperature and humidity sensor 19 to collect the temperature and humidity of the air duct at the top of the cooling air duct.

[0070] Please see Figure 3 This document illustrates a flowchart of a defrosting control method for an air-cooled refrigeration device according to an embodiment of this application. In a specific embodiment, the defrosting control method for the air-cooled refrigeration device can be applied to, for example... Figure 1 The controller 16 in the air-cooled refrigeration equipment 10 shown below will be used as an example to explain... Figure 3 The process shown is described in detail. The defrosting control method for air-cooled refrigeration equipment may include the following steps 201 to 203.

[0071] Step 201: When the first refrigeration circuit is defrosted, control the first refrigeration circuit to switch to the off state.

[0072] In this embodiment of the application, the controller can determine whether the air-cooled refrigeration equipment meets the second defrosting condition. When the air-cooled refrigeration equipment meets the second defrosting condition, the controller can control the heater to heat the first refrigeration circuit and the second refrigeration circuit to defrost. The controller can also determine whether the defrosting of the first refrigeration circuit is completed. When the defrosting of the first refrigeration circuit is completed, the controller can control the first refrigeration circuit to switch to the off state.

[0073] The second defrosting condition can be that the cooling operation time of the first refrigeration circuit and the second refrigeration circuit is greater than or equal to the duration threshold, or the frost layer thickness of the first refrigeration circuit and the second refrigeration circuit is greater than or equal to the thickness threshold, etc., which are not limited here.

[0074] Thickness thresholds can be used to characterize the maximum frost thickness in the first and second refrigeration circuits of an air-cooled refrigeration unit when defrosting is required. Duration thresholds can be used to characterize the longest operating time during which defrosting is required for an air-cooled refrigeration unit; for example, a duration threshold of 96 hours.

[0075] The controller can control the heater to heat at a first heating power, for example, the first heating power can be 120W-150W.

[0076] The controller can obtain the temperature of the second air duct in the cooling duct based on a temperature and humidity sensor, and determine whether the defrosting of the first cooling circuit is complete based on the temperature of the second air duct. Determining the completion of defrosting in the first cooling circuit based on the air duct temperature improves the accuracy of this determination.

[0077] When the temperature of the second air duct is greater than or equal to the second temperature threshold, it is determined that the defrosting of the first refrigeration circuit is completed; when the temperature of the second air duct is less than the second temperature threshold, it is determined that the defrosting of the first refrigeration circuit is not completed.

[0078] The first temperature threshold can be used to characterize the lowest duct temperature when the first refrigeration circuit is defrosted. For example, the first temperature threshold can be 8°C, and there is no limitation here.

[0079] In some implementations, when the controller determines that the first refrigeration circuit has completed defrosting, it can control the heater to stop heating and control the solenoid valve to switch to the closed state, thereby controlling the first refrigeration circuit to switch to the off state.

[0080] Step 202: Control the compressor to start, so as to drive the second refrigeration circuit to circulate refrigeration.

[0081] In this embodiment of the application, when the first refrigeration circuit is defrosted, the controller controls the first refrigeration circuit to switch to the off state and then controls the compressor to start so that the compressor drives the second refrigeration circuit to circulate refrigeration, so that the second refrigeration fins can capture the residual water vapor in the refrigeration duct and frost the residual water vapor in the duct on the surface of the second refrigeration fins.

[0082] After the compressor starts, the surface temperature of the second cooling fin drops to a lower temperature in a short time to form a frosting and moisture-collecting zone. For example, the surface temperature of the second cooling fin can drop to -5°C within 30 seconds, which is not limited here.

[0083] In some implementations, after the controller starts the compressor, it can control the first fan to turn on, thereby controlling the airflow in the refrigeration duct to the second refrigeration circuit. During the process of controlling the second refrigeration circuit to circulate and cool, the controller controls the fan to blow the water vapor in the upper part of the refrigeration duct to the second refrigeration circuit, which can accelerate the removal of residual water vapor in the refrigeration duct and improve the efficiency of removing residual water vapor in the refrigeration duct.

[0084] In some implementations, after the controller starts the compressor, it can obtain the humidity of the third air duct of the refrigeration air duct based on the temperature and humidity sensor, and determine whether the second refrigeration circuit meets the first defrosting condition based on the humidity of the third air duct.

[0085] The first defrosting condition can be used to characterize that the amount of frost in the second refrigeration circuit is sufficient and that the second refrigeration fins have captured a large amount of residual water vapor.

[0086] When the humidity in the third air duct is less than or equal to the second humidity threshold, the second refrigeration circuit is determined to meet the first defrost condition; when the humidity in the third air duct is greater than the second humidity threshold, the second refrigeration circuit is determined to not meet the first defrost condition.

[0087] The second humidity threshold can be used to characterize the maximum humidity value when the amount of frost in the second refrigeration circuit is sufficient. For example, the second humidity threshold can be 45%, which is not limited here.

[0088] Step 203: When it is determined that the second refrigeration circuit meets the first defrosting condition, control the heater to heat the second refrigeration circuit for defrosting.

[0089] In this embodiment, when the controller determines that the second refrigeration circuit meets the first defrosting condition, it can control the heater to heat the second refrigeration circuit for defrosting. The evaporator of the air-cooled refrigeration equipment is set as two independent refrigeration circuits, one above the other. After defrosting the first refrigeration circuit in the upper section of the evaporator, the flow of the first refrigeration circuit is shut off, and the second refrigeration circuit in the lower section of the evaporator is controlled to circulate and refrigerate. This can capture the residual water vapor in the refrigeration duct and frost it on the surface of the second refrigeration circuit. Heating and defrosting the second refrigeration circuit after circulating and refrigerating can effectively remove the residual water vapor in the refrigeration duct, extend the defrosting cycle of the evaporator, and help extend the effective refrigeration cycle of the air-cooled refrigeration equipment.

[0090] In some implementations, when the controller determines that the second refrigeration circuit meets the first defrosting condition, it can control the heater to heat the circuit and then control the first fan to shut down. During the defrosting process of the heater heating the second refrigeration circuit, shutting down the first fan can suppress the fan from cooling the heater's heating temperature, thus preventing the defrosting of the second refrigeration circuit from taking too long. This is beneficial to improving the efficiency of defrosting the second refrigeration circuit.

[0091] The solution provided in this embodiment controls the first refrigeration circuit to switch to a shut-off state and starts the compressor when the first refrigeration circuit defrosts, thereby driving the second refrigeration circuit to circulate and refrigerate. Furthermore, when the second refrigeration circuit meets the first defrosting conditions, the heater is controlled to heat and defrost the second refrigeration circuit. This achieves the goal of setting the evaporator of the air-cooled refrigeration equipment as two independent refrigeration circuits, and after defrosting the first refrigeration circuit in the upper section of the evaporator, shutting off the flow of the first refrigeration circuit and controlling the second refrigeration circuit in the lower section of the evaporator to circulate and refrigerate. This captures residual water vapor in the refrigeration duct and frosts it onto the surface of the second refrigeration circuit. Heating and defrosting the second refrigeration circuit after circulating and refrigerating effectively removes residual water vapor in the refrigeration duct, extends the defrosting cycle of the evaporator, and helps extend the effective refrigeration cycle of the air-cooled refrigeration equipment.

[0092] Please see Figure 4 This document illustrates a flowchart of a defrosting control method for an air-cooled refrigeration device according to another embodiment of this application. In a specific embodiment, the defrosting control method for the air-cooled refrigeration device can be applied to, for example... Figure 1 The controller 16 in the air-cooled refrigeration equipment 10 shown below will be used as an example to explain... Figure 4 The process shown is described in detail. The defrosting control method for air-cooled refrigeration equipment may include the following steps 301 to 307.

[0093] Step 301: When the first refrigeration circuit is defrosted, control the first refrigeration circuit to switch to the off state.

[0094] Step 302: Control the compressor to start, so as to drive the second refrigeration circuit to circulate refrigeration.

[0095] Step 303: When it is determined that the second refrigeration circuit meets the first defrosting condition, control the heater to heat the second refrigeration circuit for defrosting.

[0096] In this embodiment, steps 301, 302, and 303 can be referred to the corresponding steps in the foregoing embodiments, and will not be repeated here.

[0097] Step 304: Obtain the temperature of the first air duct of the cooling air duct.

[0098] In this embodiment, after the controller determines that the second refrigeration circuit meets the first defrosting condition, it controls the heater to heat the circuit and then obtains the first air duct temperature of the refrigeration air duct based on the temperature and humidity sensor, so as to determine whether the defrosting of the second refrigeration circuit is completed based on the first air duct temperature.

[0099] When the temperature of the first air duct is greater than or equal to the first temperature threshold, the defrosting of the second refrigeration circuit is determined to be complete; when the temperature of the first air duct is less than the first temperature threshold, the defrosting of the second refrigeration circuit is determined to be incomplete.

[0100] The first temperature threshold can be used to characterize the lowest duct temperature when the second refrigeration circuit is defrosted. The first temperature threshold can be less than the second temperature threshold. For example, the first temperature threshold can be 5°C and the second temperature threshold can be 8°C. No limitation is made here.

[0101] Step 305: When the temperature of the first air duct is greater than or equal to the first temperature threshold, control the heater to stop heating.

[0102] In this embodiment, when the temperature of the first air duct is greater than or equal to the first temperature threshold, it indicates that the defrosting of the second refrigeration circuit is complete, and the heater can be controlled to stop heating.

[0103] Step 306: Return to the steps of starting the compressor and subsequent steps until the preset conditions are met, then control the first refrigeration circuit to switch to the circulation state.

[0104] In this embodiment, when the temperature of the first air duct is greater than or equal to the first temperature threshold, after the controller controls the heater to stop heating, it can return to execute step 302 and subsequent steps until the preset conditions are met, and then control the first refrigeration circuit to switch to the flow state.

[0105] Among them, the preset conditions can be used to characterize the condition that there is less residual water vapor in the refrigeration duct. After a large amount of residual water vapor in the refrigeration duct is removed, the first refrigeration circuit is switched to the flow state in order to restore the refrigeration function of the air-cooled refrigeration equipment to the normal state.

[0106] In some implementations, when the temperature of the first air duct is greater than or equal to a first temperature threshold, after the controller stops heating the heater, it can determine whether a preset condition is met. If the preset condition is not met, the system returns to step 302 and subsequent steps. When it is determined that there is a large amount of residual moisture in the cooling air duct, the second cooling circuit is cyclically controlled for cooling and defrosting. This avoids energy waste caused by cyclically controlling the second cooling circuit for cooling and defrosting when there is less residual moisture in the cooling air duct, thus improving the system's energy efficiency.

[0107] In one implementation, the controller can obtain the humidity of the first air duct of the cooling air duct based on the temperature and humidity sensor, and obtain the cumulative frost amount of the second cooling circuit, and determine whether the preset conditions are met based on the humidity of the first air duct and the cumulative frost amount.

[0108] When the humidity of the first air duct is less than or equal to the first humidity threshold, and the cumulative frost amount is greater than or equal to the frost amount threshold, the preset conditions are deemed met; when the humidity of the first air duct is less than the first humidity threshold, and / or the cumulative frost amount is less than the frost amount threshold, the preset conditions are deemed not met. Judging the residual water vapor in the cooling air duct based on the air duct humidity and cumulative frost amount improves the accuracy of judging the residual water vapor in the cooling air duct.

[0109] The first humidity threshold can be used to characterize the maximum humidity when there is little residual water vapor in the cooling duct, and the frost amount threshold can be used to characterize the minimum frost amount when there is little residual water vapor in the cooling duct, etc.

[0110] The controller can acquire the evaporation temperature, bottom area, trapping coefficient, and dew point temperature of the evaporator, and calculate the cumulative frost amount based on the ice density, evaporation temperature, bottom area, trapping coefficient, and dew point temperature. This calculation of the cumulative frost amount in the second refrigeration circuit, based on the ice density, evaporation temperature, bottom area, trapping coefficient, and dew point temperature, improves the accuracy of the calculation.

[0111] The trapping coefficient can be used to characterize the length of water vapor effectively trapped by the evaporator per unit time and per unit temperature difference. The trapping coefficient is related to the relative humidity of the air in the refrigeration duct and the spacing of the second refrigeration fins. The higher the relative humidity, the higher the trapping coefficient. The smaller the fin spacing, the higher the trapping coefficient.

[0112] As an example, the bottom area of ​​the evaporator can be A, the trapping coefficient can be α, the density of the ice can be ρ, and the dew point temperature of the refrigeration duct can be T_d(k).

[0113] The evaporation temperature of the evaporator collected at time k can be T_s(k), and the time interval for collecting the evaporation temperature T_s(k) is Δt. The cumulative frost amount ∑m_frost can be calculated according to Formula 1 based on the evaporation temperature T_s(k), bottom area A, collection coefficient α, dew point temperature T_d(k), and ice density ρ.

[0114] Formula 1 is: ∑m_frost=∑(α×A×(T_d(k)-T_s(k))×Δt×ρ).

[0115] The humidity of the cooling duct collected at time k can be RH(k), and the temperature of the cooling duct can be T(k). The dew point temperature T_d(k) can be calculated according to Formula 2 based on the humidity RH(k) and the temperature T(k).

[0116] Formula 2 is: .

[0117] In one implementation, the controller can obtain the number of times the return execution has been performed and determine whether the preset conditions are met based on the number of return counts.

[0118] When the number of returns is greater than or equal to the threshold, the preset condition is determined to be met; when the number of returns is less than the threshold, the preset condition is determined not to be met. Based on the number of cycles of refrigeration and defrosting in the second refrigeration circuit, the amount of residual water vapor in the refrigeration duct is judged, which improves the accuracy of judging the amount of residual water vapor in the refrigeration duct.

[0119] The controller can record the number of times it returns to execute step 302 and subsequent steps, thus obtaining the number of returns.

[0120] The controller can obtain the humidity of the second duct of the cooling duct when the first cooling circuit defrosts, based on the temperature and humidity sensor. It then calculates the cycle count threshold based on the set frost amount of the evaporator, the set humidity of the cooling duct, and the humidity of the second duct. This calculation of the cycle count threshold based on the set frost amount, set humidity, and second duct temperature improves the accuracy of the cycle count threshold calculation.

[0121] As an example, the humidity of the second air duct can be RH_intial, the set humidity of the cooling air duct can be RH_set, and the set frost amount of the cooling air duct can be m_set. The threshold number N_max can be calculated according to Formula 3 based on the humidity of the second air duct RH_intial, the set humidity RH_set, and the set frost amount m_set.

[0122] Formula 3 is: N_max = floor[0.15 × (RH_intial - RH_set) / m_set] + 1.

[0123] Among them, floor[] can be used to represent the rounding down algorithm. The frost amount m_set can be set by looking up the preset correspondence table based on the temperature difference between the dew point temperature T_d(k) and the evaporation temperature T_s(k) (i.e., T_d(k)-T_s(k)).

[0124] The preset correspondence table can be used to characterize the correspondence between T_d(k)-T_s(k) and the set frost amount m_set, as shown in Table 1.

[0125] Table 1

[0126] It should be noted that the correspondence between T_d(k)-T_s(k) and the set frosting amount m_set is not limited to that shown in Table 1, and can be set according to actual needs.

[0127] Step 307: Control the compressor to start, so as to drive the first refrigeration circuit and the second refrigeration circuit to circulate refrigeration.

[0128] In this embodiment, the controller returns to the steps of controlling the compressor to start and subsequent steps until the preset conditions are met. After the first refrigeration circuit is switched to the flow state, the compressor can be controlled to start, so as to drive the first refrigeration circuit and the second refrigeration circuit to circulate refrigeration. The second refrigeration circuit is circulated to perform refrigeration and defrosting, which can circulate to remove residual water vapor in the refrigeration duct, which is beneficial to further extend the effective refrigeration cycle of the air-cooled refrigeration equipment.

[0129] The solution provided in this embodiment controls the first refrigeration circuit to switch to the off state and starts the compressor when the first refrigeration circuit defrosts, thereby driving the second refrigeration circuit to circulate and refrigerate. When the second refrigeration circuit meets the first defrosting condition, the heater is controlled to heat and defrost the second refrigeration circuit. The temperature of the first air duct is obtained, and when the temperature of the first air duct is greater than or equal to the first temperature threshold, the heater is controlled to stop heating, and the process returns to the step of controlling the compressor to start and subsequent steps until the preset condition is met. Then, the first refrigeration circuit is controlled to switch to the flow state, and the compressor is controlled to start, thereby driving the first and second refrigeration circuits to circulate and refrigerate. This achieves the configuration of the evaporator of the air-cooled refrigeration equipment as two independent refrigeration circuits, and after defrosting the first refrigeration circuit in the upper section of the evaporator, the flow of the first refrigeration circuit is turned off, and the second refrigeration circuit in the lower section of the evaporator is controlled to circulate and refrigerate. This can capture the residual water vapor in the refrigeration air duct and frost it on the surface of the second refrigeration circuit. Heating and defrosting the second refrigeration circuit after circulating and refrigerating can effectively remove the residual water vapor in the refrigeration air duct, extend the defrosting cycle of the evaporator, and help extend the effective refrigeration cycle of the air-cooled refrigeration equipment.

[0130] Furthermore, the second refrigeration circuit is cyclically controlled for refrigeration and defrosting, which can cyclically remove residual moisture in the refrigeration duct, thus further extending the effective refrigeration cycle of the air-cooled refrigeration equipment.

[0131] 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 500 stores program code 501, which can be called by a processor to execute the methods described in the above method embodiments.

[0132] The computer-readable storage medium 500 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 500 includes a non-transitory computer-readable storage medium. The computer-readable storage medium 500 has storage space for program code 501 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 501 may be compressed, for example, in a suitable form.

[0133] Please refer to Figure 6 This diagram illustrates a structural block diagram of a computer program product 600 provided in an embodiment of this application. The computer program product 600 includes a computer program / instructions 601, which is stored in a computer-readable storage medium of a computer device. When the computer program product 600 runs on the computer device, the processor of the computer device reads the computer program / instructions 601 from the computer-readable storage medium, and executes the computer program / instructions 601, causing the computer device to perform the methods described in the above-described method embodiments.

[0134] 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. An air-cooled refrigeration device, characterized in that, include: The enclosure contains a refrigeration chamber. A cooling air duct is used to deliver cold air to the cooling room; An evaporator installed inside the refrigeration duct for exchanging heat with the gas inside the refrigeration duct. The evaporator includes a first refrigeration circuit and a second refrigeration circuit. The first refrigeration circuit is located at the upper part of the refrigeration duct, and the second refrigeration circuit is located at the lower part of the refrigeration duct. A compressor is used to drive the first refrigeration circuit and the second refrigeration circuit to circulate refrigeration, wherein the first refrigeration circuit and the second refrigeration circuit are connected in parallel to the compressor; A heater is installed below the second refrigeration circuit to heat and defrost the first and second refrigeration circuits. And a controller connected to the compressor and the heater, the controller being configured to: When the first refrigeration circuit completes defrosting, control the first refrigeration circuit to switch to the off state; The compressor is started to drive the second refrigeration circuit to circulate refrigeration. When it is determined that the second refrigeration circuit meets the first defrosting condition, the heater is controlled to heat the second refrigeration circuit for defrosting.

2. The air-cooled refrigeration equipment according to claim 1, characterized in that, The controller is also configured to: Obtain the temperature of the first air duct of the cooling air duct; When the temperature of the first air duct is greater than or equal to the first temperature threshold, the heater is controlled to stop heating; Return to the step of controlling the compressor to start and subsequent steps until the preset conditions are met, and control the first refrigeration circuit to switch to the flow state; The compressor is controlled to start, so as to drive the first refrigeration circuit and the second refrigeration circuit to circulate refrigeration.

3. The air-cooled refrigeration equipment according to claim 2, characterized in that, Before executing the step of returning to execute the control of the compressor to start and subsequent steps, the controller is also configured to: Determine whether the preset conditions are met; If it is determined that the preset conditions are not met, return to the step of controlling the compressor to start and subsequent steps.

4. The air-cooled refrigeration equipment according to claim 3, characterized in that, The controller determines whether the preset condition is met and is configured as follows: Obtain the humidity of the first air duct of the cooling air duct; Obtain the cumulative frosting amount of the second refrigeration circuit; When the humidity of the first air duct is less than or equal to the first humidity threshold, and the cumulative frost amount is greater than or equal to the frost amount threshold, it is determined that the preset condition is met. When the humidity of the first air duct is less than the first humidity threshold, and / or the cumulative frost amount is less than the frost amount threshold, it is determined that the preset condition is not met.

5. The air-cooled refrigeration equipment according to claim 4, characterized in that, The controller acquires the cumulative frosting amount of the second refrigeration circuit and is configured as follows: The evaporation temperature, bottom area, trapping coefficient of the evaporator, and dew point temperature of the refrigeration duct are obtained. The trapping coefficient is used to characterize the length of water vapor effectively trapped by the evaporator per unit time and per unit temperature difference. The cumulative amount of frost is calculated based on the ice density, the evaporation temperature, the bottom area, the trapping coefficient, and the dew point temperature.

6. The air-cooled refrigeration equipment according to claim 3, characterized in that, The controller determines whether the preset condition is met and is configured as follows: Get the number of times the execution returned; When the number of returns is greater than or equal to the number of returns threshold, it is determined that the preset condition is met; When the number of returns is less than the number of times, it is determined that the preset condition is not met.

7. The air-cooled refrigeration equipment according to claim 6, characterized in that, Before the controller determines that the preset condition is met when the number of returns is greater than or equal to the number of returns threshold, the controller is further configured to: Obtain the humidity of the second air duct of the refrigeration air duct when the first refrigeration circuit completes defrosting; The number of times threshold is calculated based on the set frost amount of the evaporator, the set humidity of the cooling duct, and the humidity of the second duct.

8. The air-cooled refrigeration equipment according to any one of claims 1 to 7, characterized in that, It also includes a first fan, which is installed at the top of the refrigeration duct and is used to control the airflow within the refrigeration duct to the evaporator; before the controller controls the heater to heat the system when it determines that the second refrigeration circuit meets the first defrosting condition, it is further configured to: The first fan is turned on to control the airflow in the cooling duct to the evaporator; After determining that the second refrigeration circuit meets the first defrosting condition, the controller controls the heater to heat up and is further configured to: Control the first fan to shut down.

9. The air-cooled refrigeration equipment according to any one of claims 1 to 7, characterized in that, Before the controller switches the first refrigeration circuit to the off state after defrosting is completed, it is further configured to: Obtain the temperature of the second air duct of the cooling air duct; The defrosting status of the first refrigeration circuit is determined based on the temperature of the second air duct.

10. A defrosting control method for an air-cooled refrigeration device, characterized in that, The air-cooled refrigeration equipment includes a housing with a refrigeration chamber, a refrigeration duct for supplying cold air to the refrigeration chamber, an evaporator, a compressor, and a heater. The evaporator includes a first refrigeration circuit and a second refrigeration circuit. The first refrigeration circuit is located at the upper part of the refrigeration duct, and the second refrigeration circuit is located at the lower part of the refrigeration duct. The first refrigeration circuit and the second refrigeration circuit are connected in parallel to the compressor, which drives the first refrigeration circuit and the second refrigeration circuit to circulate refrigeration. The heater is installed below the second refrigeration circuit and is used to heat and defrost the first refrigeration circuit and the second refrigeration circuit. The defrosting control method includes: When the first refrigeration circuit completes defrosting, control the first refrigeration circuit to switch to the off state; The compressor is started to drive the second refrigeration circuit to circulate refrigeration. When it is determined that the second refrigeration circuit meets the first defrosting condition, the heater is controlled to heat the second refrigeration circuit for defrosting.

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