A control method and control device for a cold store and a cold store

Abstract

The application discloses a control method and device of a cold storage cabinet and the cold storage cabinet. The cold storage cabinet is provided with a fan, the fan is a variable frequency fan, the operation mode of the fan is provided with a frequency increasing mode and a frequency decreasing mode, and the control method comprises the following steps: monitoring the cabinet temperature change condition of the cold storage cabinet; and controlling the operation mode of the fan according to the cabinet temperature change condition. According to the control method, the door opening and closing state is determined according to the cabinet temperature change trend, the fan mode conversion is controlled, and the problem that the fan is frequently started and stopped under the control of the refrigeration switch and the cost is high can be solved.

Description

Technical Field

[0001] This invention relates to the field of refrigeration, and more particularly to a control method, control device, and cold storage cabinet. Background Technology

[0002] The enclosed cabinet mainly consists of a foam box, glass door, refrigeration system, and shelves. It is suitable for beverage sales in convenience stores and various supermarkets. The split type uses a condenser unit to refrigerate the beverages inside the cabinet, while the portable type has its own refrigeration system.

[0003] The energy consumption of a closed cabinet is usually expressed by the heat dissipation rate. The heat dissipation rate is mainly affected by its own insulation performance and the amount of cold air leakage and hot air entrainment when the door is opened and closed. This is also the main direction for improving energy efficiency.

[0004] Currently, most products in the industry use axial flow fans for forced air cooling, while a few attempt to use cross-flow fans. Triggering the fan's start and stop when the door is opened or closed can reduce the amount of cold air escaping and hot air entrainment, thereby reducing heat loss and improving energy efficiency. However, fan control is merely a simple cooling switch; during the process of opening and closing the door to retrieve goods, significant heat load and cold air leakage occur. Furthermore, the fan is controlled by the cooling mode and door opening / closing, resulting in frequent fan starts and stops. For multi-door enclosed cabinets, multiple external switches are required, which is cumbersome and costly to install. Additionally, the frequent fan starts and stops due to the cooling mode and door opening / closing cause significant wear and tear on the fan and reduce cooling efficiency. Summary of the Invention

[0005] In view of this, the present invention discloses a control method, control device and cold storage cabinet for cold storage cabinet, which is used to solve the problem that the fan is controlled by the cooling mode and the door opening and closing, the fan starts and stops frequently, the fan wears out heavily and the cooling efficiency is reduced.

[0006] The first aspect of this invention discloses a control method for a cold storage cabinet, wherein the cold storage cabinet is equipped with a fan, the fan is a variable frequency fan, and the fan has an operating mode of frequency increase mode and frequency decrease mode. The control method includes:

[0007] Monitor the temperature changes of the cold storage cabinet;

[0008] The operating mode of the fan is controlled according to the changes in the cabinet temperature.

[0009] Further optionally, the monitoring of the temperature change of the cold storage cabinet includes:

[0010] Monitor the temperature change of the cold storage cabinet within a preset period.

[0011] Further optionally, controlling the operating mode of the fan based on the cabinet temperature change includes:

[0012] Determine whether the change in cabinet temperature is greater than a first preset value;

[0013] If so, control the fan to enter the frequency reduction mode.

[0014] Further optionally, when the cabinet temperature change is less than or equal to the first preset value, the control method further includes:

[0015] Determine whether the change in cabinet temperature is greater than zero;

[0016] If so, control the fan to maintain the current operating mode;

[0017] If not, control the fan to enter the frequency boost mode.

[0018] Further, optionally, the control method also includes:

[0019] Monitor the condensation level in the cold storage cabinet;

[0020] The target frequency of the fan in its corresponding mode is controlled based on the condensation level.

[0021] Optionally, the cold storage cabinet is provided with an air outlet, and multiple electrode pairs for detecting condensation are arranged around the air outlet. When condensation occurs at the location of each electrode pair, the electrode pair is turned on. The monitoring of the condensation amount in the cold storage cabinet includes:

[0022] The condensation amount is determined by detecting the proportion of conductive electrode pairs.

[0023] Further optionally, controlling the target frequency of the fan in its corresponding mode based on the condensation amount includes:

[0024] Determine whether the amount of condensation is greater than a second preset value;

[0025] If so, control the fan to operate at the lowest frequency in its corresponding mode as the target frequency.

[0026] Further optionally, when the condensation amount is less than or equal to the second preset value, the control method further includes:

[0027] The target frequency of the fan is determined based on the lowest frequency, highest frequency, and condensation coefficient of the fan in its corresponding mode.

[0028] Further, optionally, the control method further includes:

[0029] The target frequency is calculated using the following formula:

[0030] F 目标 =F 最低 +(F 最高 -F 最低)×C;

[0031] Among them, F 目标 The target frequency is represented by C, the condensation coefficient is represented by F. 最低 F represents the lowest frequency of the fan in its corresponding mode. 最高 This indicates the highest frequency of the fan in its corresponding mode.

[0032] Alternatively, C = Cn - Cmin;

[0033] Wherein, Cn is the number of the conducting electrode pairs, and Cmin is a set value.

[0034] Further optionally, after determining the target frequency, the control method further includes:

[0035] The target frequency is compared with the lowest and highest frequencies of the wind turbine in its corresponding mode;

[0036] When the target frequency is less than or equal to the highest frequency and greater than or equal to the lowest frequency, the fan is controlled to operate at the target frequency.

[0037] When the target frequency is greater than the highest frequency, the fan is controlled to operate at the highest frequency;

[0038] When the target frequency is less than the minimum frequency, the fan is controlled to operate at the minimum frequency.

[0039] Further, optionally, the control method further includes:

[0040] The condensation level of the cold storage cabinet is re-monitored, and the target frequency is corrected based on the re-monitored condensation level.

[0041] A second aspect of the present invention discloses a control device for a cold storage cabinet, including a memory and a processor;

[0042] Memory is used to store computer programs;

[0043] A processor, used to implement the control method provided in the first aspect when executing a computer program.

[0044] The third aspect of the present invention discloses a cold storage cabinet that employs the control method provided in the first aspect, or includes the control device provided in the second aspect.

[0045] Beneficial effects: This invention determines the door opening / closing status by observing the cabinet temperature change trend, thereby controlling the fan mode switching. Compared with the prior art where the fan is controlled by the cooling switch, this invention can reduce control costs and improve reliability. By switching the fan operating mode, frequent fan start-stop is avoided, hot air entrainment is reduced, and the accumulation of cold air at the bottom due to density is reduced, thus ensuring cooling efficiency.

[0046] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0047] The accompanying drawings, as part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0048] Figure 1a One of the schematic diagrams of the air circulation of a cold storage cabinet according to an embodiment of the present invention is shown.

[0049] Figure 1b This is a second schematic diagram of the air circulation of a cold storage cabinet according to an embodiment of the present invention.

[0050] Figure 2a A schematic diagram of the structure of the air outlet cover of a cold storage cabinet according to an embodiment of the present invention is shown.

[0051] Figure 2b An enlarged schematic diagram of an electrode pair according to an embodiment of the present invention is shown.

[0052] Figure 3 This is a schematic flowchart illustrating one embodiment of the control method for a cold storage cabinet according to the present invention.

[0053] Figure 4 This is a second schematic flowchart illustrating a control method for a cold storage cabinet according to an embodiment of the present invention.

[0054] Figure 5 The third schematic diagram shows a control method for a cold storage cabinet according to an embodiment of the present invention.

[0055] Figure 6 The fourth schematic flowchart illustrates a control method for a cold storage cabinet according to an embodiment of the present invention.

[0056] Figure 7 The fifth illustration shows a flowchart of a control method for a cold storage cabinet according to an embodiment of the present invention.

[0057] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0058] In the description of this invention, it should be noted that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0059] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "contact," and "communication" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0060] To address the problems of frequent fan start-stop cycles, heavy fan wear, and reduced cooling efficiency in existing enclosed cabinets due to reliance on cooling modes and door opening / closing, this invention provides a control method for a cold storage cabinet. The cold storage cabinet is equipped with a variable frequency fan, which has two operating modes: a frequency-increasing mode and a frequency-decreasing mode. This control method can be applied to various types of split, self-contained, vertical, and horizontal enclosed cabinets.

[0061] Taking a vertical sealed cabinet as an example, combined with the attached Figure 1a , 1b In the diagram, solid arrows represent cold air and dashed arrows represent hot air. When the door is closed, the airflow inside the cabinet is isolated from the outside, and the heat load is mainly due to heat conduction between the cabinet, glass door, and the outside. When the door is opened, the intake of hot air from the outside and the exhaust of cold air from inside the cabinet increase. Due to density, the amount of cold air exhaust will be positively correlated with the amount of hot air intake.

[0062] Combined with appendix Figure 2a The cabinet temperature sensor is installed at the return air inlet 3 of the sealed cabinet to detect the return air temperature of the evaporator. When the return air temperature is lower than the shutdown temperature, the cooling system shuts down; when the return air temperature is higher than the start-up temperature, the cooling system starts up.

[0063] When the door is closed, the temperature detected by the cabinet temperature sensor will gradually decrease as the temperature of the circulating return air decreases. However, when the glass door is opened, the temperature detected by the cabinet temperature sensor will rise rapidly due to the inhalation of hot air. At the same time, condensation is likely to occur at the air outlet.

[0064] Based on this, this embodiment uses the temperature sensor's change trend to determine the door's opening and closing status and thus control the fan mode switching. It also uses the detection of condensation in the cold storage cabinet to determine the target frequency of the fan in its corresponding mode. This control method can reduce control costs and improve reliability, avoid frequent fan start-stop, ensure cooling efficiency, and reduce condensation.

[0065] Combination Figure 3 The control flowchart of this embodiment, the control method, includes steps S1 to S2, wherein:

[0066] S1, monitors the temperature changes of the cold storage cabinet;

[0067] S2 controls the fan's operating mode based on changes in cabinet temperature.

[0068] The cabinet temperature change data includes the amount and rate of temperature change within a preset period. This temperature change data is used to determine the door's open / closed status and control the fan's operating mode. Switching fan operating modes avoids frequent fan starts and stops, reduces hot air entrainment, and minimizes the accumulation of cold air at the bottom due to density limitations, thus ensuring cooling efficiency. Compared to door-operated control, this method reduces control costs and improves reliability.

[0069] Further optionally, step S1 involves monitoring the temperature change of the cold storage cabinet, including S11, wherein:

[0070] S11 monitors the temperature change of the cold storage cabinet within a preset period.

[0071] Specifically, the system uses a temperature sensor to detect the cabinet temperature in real time. The system acquires the cabinet temperature at preset time intervals, thereby determining the temperature change of the cold storage cabinet within a preset period.

[0072] Further optionally, step S11 includes steps S11 to S12, wherein:

[0073] S111, the average temperature of the monitoring cabinet during the monitoring cycle;

[0074] S112, calculate the temperature change based on the average temperature of two adjacent detection cycles.

[0075] Specifically, the detection period is ts, and the temperature change is ΔT. n , △T n =T n -T n-1 Using the average temperature change over the detection period to determine the door opening / closing status of the sealed cabinet can improve accuracy.

[0076] Further, optionally, combined Figure 4Schematic diagram of the process. In step S2, the operation mode of the fan is controlled according to the change of the cabinet temperature, including:

[0077] S21, determine whether the change in the cabinet temperature is greater than the first preset value; if so, execute S22;

[0078] S22, control the fan to enter the frequency reduction mode.

[0079] Specifically, increase the determination value Topen (i.e., the first preset value). Topen is the temperature change range. When the door is opened, the cabinet temperature rises, Topen > 0. When the door is closed, if there is a new heat source in the cabinet, such as a room-temperature beverage, the cabinet temperature will rise briefly and then fall. Add the fan operation mode, the frequency reduction mode (code name OP mode). When △Tn > Topen, at this time, the return air load rises rapidly, it is determined that the door is in the open state at this time, and enter the frequency reduction mode. The OP mode corresponds to the rotational speed r op , when in this mode, the fan frequency decreases, reducing the return air volume, reducing the intake of hot air and the leakage of cold air, and improving the operating energy efficiency of the product.

[0080] Further optionally, the control method further includes step S23. When the change in the cabinet temperature is less than or equal to the first preset value, execute S23;

[0081] S23, determine whether the change in the cabinet temperature is greater than zero; if so, execute S24, if not, execute S25;

[0082] S24, control the fan to maintain the current operation mode; specifically, make the fan maintain the current operation mode and the frequency maintain the current frequency;

[0083] S25, control the fan to enter the frequency increase mode.

[0084] Specifically, add the fan operation mode, the frequency increase mode (code name CL mode). When △Tn < 0, enter the CL mode. The CL mode corresponds to the rotational speed r cl , the fan speed rises, increasing the circulating air volume. At this time, the refrigeration rate in the cabinet increases, ensuring the refrigeration efficiency.

[0085] When 0 < △Tn < Topen, it means that the current operation mode and operation frequency of the fan can ensure the cabinet temperature requirement, so the current mode and frequency are maintained.

[0086] Further optionally, in combination with Figure 5 the schematic diagram of the process, the control method further includes S3 to S4, where:

[0087] S3, monitor the condensation amount of the cold storage cabinet;

[0088] S4, control the target frequency of the fan in its corresponding mode according to the condensation amount.

[0089] By judging the door opening and closing status by the cabinet temperature change, the motor mode switching can be controlled. Switching the motor operation mode can avoid frequent start and stop of the fan, reducing the cooling energy consumption during operation. Furthermore, by judging the condensation of the cold storage cabinet, the target frequency of the fan in its corresponding mode can be controlled to reduce condensation.

[0090] Further, optionally, combined Figure 2a and Figure 2b The cold storage cabinet is equipped with an air outlet 1, and multiple electrode pairs 2 for detecting condensation are arranged around the air outlet 1. When condensation occurs at the location of each electrode pair 2, the electrode pair 2 is turned on. Step S3 can be specifically as follows:

[0091] The amount of condensation is determined by detecting the proportion of conductive electrode pairs.

[0092] Specifically, referring to Figure 2, this embodiment has several rectangular cells around the air outlet. A sensor for detecting condensation is installed in each rectangular cell. The sensor includes sensing electrode A and electrode B, which are respectively mounted on the left and right sides of the cell. Electrodes A and B do not contact each other, making each rectangular cell an independent detection unit. The two sensing electrodes of the sensor use a conductive metallic material. When condensation occurs, electrodes A and B conduct, and the main control board detects the circuit continuity signal, recording the occurrence of condensation at a measurement point. Based on a set program, the amount of condensation is determined, thereby driving the fan to prevent and mitigate condensation. There are a total of Cj detection units around the air outlet, of which Cn detect condensation, and the ratio of conducting electrode pairs is equal to Cn / Cj.

[0093] Further, optionally, combined Figure 6 The flowchart shows that S4 includes S41 to S42, where:

[0094] S41, determine whether the condensation amount is greater than the second preset value; if so, execute S42;

[0095] S42 controls the fan to operate at the lowest frequency in its corresponding mode as the target frequency.

[0096] Specifically, in combination Figure 7 The flowchart illustrates the process as follows: In OP mode, it checks if Cn / Cj is greater than 1 / 2; if yes, the evaporator fan operates at the F_low_fan frequency; otherwise, the evaporator fan operates according to the set logic. In CL mode, it checks if Cn / Cj is greater than 1 / 2; if yes, the evaporator fan operates at the F_mid_fan frequency; otherwise, the evaporator fan operates according to the set logic.

[0097] Further, optionally, combined Figure 6The flowchart illustrates that the control method further includes: when the condensation amount is less than or equal to the second preset value, executing S43:

[0098] S43, determine the target frequency of the fan based on the fan's lowest frequency, highest frequency and condensation coefficient in its corresponding mode.

[0099] The control method of this embodiment can determine the target frequency based on the lowest frequency, highest frequency and preset condensation coefficient of the fan in its corresponding mode. Running the fan at the target frequency can effectively avoid frequent motor start-stop, ensure cooling efficiency and effectively reduce condensation.

[0100] Further, optionally, the control method also includes:

[0101] The target frequency is calculated using the following formula:

[0102] F 目标 =F 最低 +(F 最高 -F 最低 )×C;

[0103] Among them, F 目标 Indicates the target frequency, C represents the condensation coefficient, and F represents the condensation coefficient. 最低 F represents the lowest frequency of the fan in its corresponding mode. 最高 This indicates the highest frequency of the fan in its corresponding mode.

[0104] Alternatively, C = Cn - Cmin;

[0105] Where Cn is the number of conducting electrode pairs, and Cmin is a set value.

[0106] Further, optionally, combined Figure 6 The flowchart illustrates that after determining the target frequency, the control method also includes S44:

[0107] S44, determine whether the target frequency is less than the lowest frequency of the wind turbine in its corresponding mode; if not, proceed to S45; if yes, proceed to S46.

[0108] S45, determine whether the target frequency is greater than the highest frequency of the wind turbine in its corresponding mode; if not, proceed to S47; if yes, proceed to S48.

[0109] S46 controls the fan to operate at the lowest frequency;

[0110] S47 controls the fan to operate at the target frequency;

[0111] S48 controls the fan to operate at its highest frequency.

[0112] The control method in this embodiment, based on determining the target frequency of the fan, further determines whether it meets the frequency requirements of its corresponding mode. This effectively avoids frequent motor start-stops, ensures cooling efficiency, and effectively reduces condensation. If the target frequency is not less than the lowest frequency in that mode, and also not greater than the highest frequency in that mode, the fan is operated at the target frequency, which effectively reduces condensation. Conversely, if the target frequency is less than the lowest frequency, it is operated at the lowest frequency; or if the target frequency is greater than the highest frequency, it is operated at the highest frequency.

[0113] Further, optionally, combined Figure 6 The flowchart shows that the control method also includes S5:

[0114] S5, re-monitor the condensation level in the cold storage cabinet, and correct the target frequency based on the re-monitored condensation level.

[0115] Specifically, after the fan operates at the target frequency in its corresponding mode, the temperature inside the cabinet will change, which will affect the amount of condensation generated in the cold storage cabinet. At this time, the amount of condensation in the cold storage cabinet is re-monitored, and the target frequency of the fan is adjusted in real time based on the feedback of the condensation amount obtained in real time, so as to further ensure the cooling efficiency and reduce condensation.

[0116] The following is combined Figure 7 The control flowchart further illustrates the control method of this embodiment.

[0117] The evaporator fan uses a variable frequency fan with a frequency range of [F_low_fan, F_high_fan];

[0118] The fan frequency range in OP mode (frequency reduction mode) [F_low_fan, F_mid_fan];

[0119] The fan frequency range in CL mode (up-frequency mode) [F_mid_fan, F_high_fan];

[0120] When the cold storage cabinet starts cooling and the fan starts, the real-time cabinet temperature Tn is detected by a temperature sensor. It is then determined whether Tn is greater than Topen (i.e., the first preset value). If so, the evaporator fan enters OP mode. In this mode, it is determined whether Cn / Cj is greater than 1 / 2. If so, the evaporator fan operates at its lowest frequency F_low_fan for the corresponding mode. When Cn / Cj is not greater than 1 / 2, the evaporator fan operates according to logic.

[0121] When Tn does not satisfy being greater than Topen, further determine whether Tn is greater than 0. If so, keep the fan in the current mode and frequency; if not, make the evaporation fan enter the CL mode. In this mode, determine whether Cn / Cj is greater than 1 / 2. If so, the evaporation fan runs at the lowest frequency F_mid_fan in its corresponding mode; if not, the evaporation fan runs according to the logic.

[0122] Specifically, the evaporation fan uses a variable-frequency fan, and the fan frequency range is [F_low_fan, F_high_fan];

[0123] In the OP mode, the fan frequency range is [F_low_fan, F_mid_fan];

[0124] In the CL mode, the fan frequency range is [F_mid_fan, F_high_fan];

[0125] Adjust the appropriate working frequency of the motor according to the condensation situation and door opening and closing state during the operation of the unit. The period is tz_fan. The working frequency Fn_fan of the fan in the nth cycle is:

[0126] OP mode:

[0127] If F_low_fan ≤ Fn_fan ≤ F_mid_fan:

[0128] Fn_fan = F_low_fan + (F_mid_fan - F_low_fan) × (Cn - Cmin);

[0129] If Fn_fan > F_mid_fan: then make the working frequency of the fan Fn_fan = F_mid_fan;

[0130] If Fn_fan < F_low_fan: then make the working frequency of the fan Fn_fan = F_low_fan;

[0131] CL mode:

[0132] If F_mid_fan ≤ Fn_fan ≤ F_high_fan:

[0133] Fn_fan = F_mid_fan + (F_high_fan - F_mid_fan) × (Cn - Cmin);

[0134] If Fn_fan > F_high_fan: then the working frequency of the fan Fn_fan = F_high_fan

[0135] If Fn_fan < F_mid_fan: then the working frequency of the fan Fn_fan = F_mid_fan

[0136] Where Cn represents the number of condensation signals, and Cmin is the preset number.

[0137] In the above formula, F_low_fan, F_mid_fan, F_high_fan, and Cmin are all set values.

[0138] Furthermore, the condensation level of the cold storage cabinet is re-monitored, and the target frequency is adjusted based on the re-monitored condensation level to achieve a better anti-condensation effect.

[0139] A second aspect of the present invention discloses a control device for a cold storage cabinet, including a memory and a processor; the memory is used to store a computer program; the processor is used to implement the control method provided according to the first aspect of the embodiment when executing the computer program.

[0140] A third aspect of the present invention discloses a cold storage cabinet that employs the control method provided in the first aspect embodiment, or includes the control device provided in the second aspect embodiment.

[0141] This invention determines the door opening / closing status by changing cabinet temperature, thereby controlling the fan mode switching, reducing control costs and improving reliability; by switching the fan operating mode, it avoids frequent fan start-stop, reduces hot air entrainment, and reduces the accumulation of cold air at the bottom due to density, thus ensuring cooling efficiency; by adjusting the appropriate operating frequency of the motor according to the condensation amount and door opening / closing status during unit operation, it can effectively reduce the risk of condensation.

[0142] Exemplary embodiments of this disclosure have been specifically shown and described above. It should be understood that this disclosure is not limited to the detailed structures, arrangements, or implementations described herein; rather, this disclosure is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

[0143] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0144] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0145] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A control method for a cold storage cabinet, wherein the cold storage cabinet is equipped with a fan, the fan is a variable frequency fan, and the fan has an operating mode including a frequency increase mode and a frequency decrease mode, characterized in that, The control method includes: Monitor the temperature changes of the cold storage cabinet; The door opening / closing status is determined based on the cabinet temperature changes. The operating mode of the fan is controlled according to the changes in the cabinet temperature; Adjusting the fan's operating frequency based on the condensation situation and door open / close status during unit operation includes: when the door is determined to be open based on the cabinet temperature change, controlling the fan to enter the frequency reduction mode; and when the condensation in the cold storage cabinet is greater than a second preset value, controlling the fan to operate at the lowest frequency in the frequency reduction mode.

2. The control method according to claim 1, characterized in that, The monitoring of temperature changes in the cold storage cabinet includes: Monitor the temperature change of the cold storage cabinet within a preset period.

3. The control method according to claim 2, characterized in that, The method of controlling the operating mode of the fan based on the cabinet temperature change includes: Determine whether the change in cabinet temperature is greater than a first preset value; If so, control the fan to enter the frequency reduction mode.

4. The control method according to claim 3, characterized in that, When the temperature change in the cabinet is less than or equal to the first preset value, the control method further includes: Determine whether the change in cabinet temperature is greater than zero; If so, control the fan to maintain the current operating mode; If not, control the fan to enter the frequency boost mode.

5. The control method according to claim 1, characterized in that, The cold storage cabinet is equipped with an air outlet, and multiple electrode pairs for detecting condensation are arranged around the air outlet. When condensation occurs at the location of each electrode pair, the electrode pair becomes conductive. The monitoring of the condensation amount in the cold storage cabinet includes: The condensation amount is determined by detecting the proportion of conductive electrode pairs.

6. The control method according to claim 5, characterized in that, When the condensation amount is less than or equal to the second preset value, the control method further includes: The target frequency of the fan is determined based on the lowest frequency, highest frequency, and condensation coefficient of the fan in its corresponding mode.

7. The control method according to claim 6, characterized in that, The control method further includes: The target frequency is calculated using the following formula: F 目标 = F 最低 +(F 最高 -F 最低 )×C; Among them, F 目标 The target frequency is represented by C, the condensation coefficient is represented by F. 最低 F represents the lowest frequency of the fan in its corresponding mode. 最高 This indicates the highest frequency of the fan in its corresponding mode.

8. The control method according to claim 7, characterized in that, C = Cn - Cmin; Where Cn is the number of conducting electrode pairs, and Cmin is a set value.

9. The control method according to claim 6, characterized in that, After determining the target frequency, the control method further includes: The target frequency is compared with the lowest and highest frequencies of the wind turbine in its corresponding mode; When the target frequency is greater than or equal to the minimum frequency and less than or equal to the maximum frequency, the fan is controlled to operate at the target frequency; When the target frequency is greater than the highest frequency, the fan is controlled to operate at the highest frequency; When the target frequency is less than the minimum frequency, the fan is controlled to operate at the minimum frequency.

10. The control method according to claim 9, characterized in that, The control method further includes: The condensation level of the cold storage cabinet is re-monitored, and the target frequency is corrected based on the re-monitored condensation level.

11. A control device for a cold storage cabinet, characterized in that, Including memory and processor; The memory is used to store computer programs; The processor is configured to implement the control method according to any one of claims 1-10 when executing the computer program.

12. A cold storage cabinet, characterized in that, It employs the control method according to any one of claims 1-10, or includes the control device according to claim 11.

Images