Control method and device of cold-heat dual-purpose cold storage equipment and cold-heat dual-purpose cold storage equipment

Abstract

Embodiments of the present application provide a control method and device for a cold-heat dual-purpose cold storage equipment and the cold-heat dual-purpose cold storage equipment; the method comprises: determining the operation mode of the cold-heat dual-purpose cold storage equipment according to the working requirement, enabling the target passage corresponding to the refrigerant flow according to the operation mode, the target passage belongs to the first passage or the second passage, obtaining the current low-pressure value corresponding temperature, the warehouse temperature and the target suction superheat value, and controlling the opening degree of the electronic expansion valve of the target passage based on the operation mode, according to the current low-pressure value corresponding temperature, the warehouse temperature and the target suction superheat value. According to the operation mode, the target passage corresponding to the refrigerant flow is enabled, and the opening degree of the electronic expansion valve of the target passage is controlled according to the current low-pressure value corresponding temperature, the warehouse temperature and the target suction superheat value in the operation process of the unit, so that the unit can run normally under the current working condition, the defrosting is reduced, and the frequent temperature abnormal fluctuation caused by frequent defrosting is avoided.

Description

Technical Field

[0001] This invention relates to the technical field of dual-purpose cold storage equipment, specifically to a control method, device, and dual-purpose cold storage equipment. Background Technology

[0002] With the development of the times, the demand for cold storage has increased, and the requirements for its functions have also increased. Today's cold storage not only needs cold storage and preservation functions, but also needs to accelerate ripening. However, current cold storage equipment can usually only be used for refrigeration or heating. If both heating and refrigeration are required, many cold storage devices either operate normally in refrigeration but suffer from severe frost buildup in heating, or they operate normally in heating but suffer from severe frost buildup in refrigeration. In other words, current dual-purpose cold storage equipment requires frequent defrosting, which leads to frequent abnormal temperature fluctuations in the cold storage.

[0003] In summary, current dual-purpose cold storage equipment technology suffers from the technical problem of frequent abnormal temperature fluctuations due to the need for frequent defrosting. Summary of the Invention

[0004] To alleviate the technical problem of frequent abnormal temperature fluctuations in current dual-purpose cold storage equipment due to the need for frequent defrosting, this invention provides a control method, device, and dual-purpose cold storage equipment.

[0005] In a first aspect, embodiments of the present invention provide a control method for a dual-purpose cold storage device, the dual-purpose cold storage device including a first passage and a second passage, the first passage being provided with a first solenoid valve and a first electronic expansion valve, the second passage being provided with a second solenoid valve and a second electronic expansion valve, the refrigerant flow rate of the first electronic expansion valve being greater than the refrigerant flow rate of the second electronic expansion valve, the method comprising:

[0006] The operating mode of the dual-purpose cold storage equipment is determined according to the work requirements;

[0007] According to the operating mode, the target passage with the corresponding refrigerant flow is activated, and the target passage belongs to the first passage or the second passage;

[0008] Obtain the current low pressure value, corresponding temperature, storage temperature, and target intake superheat value;

[0009] Based on the operating mode, the opening degree of the electronic expansion valve of the target passage is controlled according to the temperature corresponding to the current low pressure value, the storage temperature, and the target intake superheat value.

[0010] In some embodiments, activating the target path corresponding to the refrigerant flow rate according to the operating mode includes:

[0011] When the operating mode is cooling mode, the second path is identified as the target path, the first path is closed and the second path is enabled;

[0012] When the operating mode is heating mode, the first path is identified as the target path, the second path is closed and the first path is enabled.

[0013] In some embodiments, when the operating mode is a cooling mode, controlling the opening of the electronic expansion valve of the target passage based on the operating mode, the temperature corresponding to the low pressure value, the storage temperature, and the target suction superheat value includes:

[0014] When the temperature corresponding to the current low pressure value is greater than the preset temperature, the second electronic expansion valve is adjusted according to the target intake superheat value.

[0015] When the temperature corresponding to the current low pressure value is not greater than the preset temperature, and the difference between the storage temperature and the temperature corresponding to the current low pressure value is less than the difference threshold, the second electronic expansion valve is adjusted according to the target intake superheat value.

[0016] When the temperature corresponding to the current low pressure value is not greater than the preset temperature, and the difference between the storage temperature and the temperature corresponding to the current low pressure value is not less than the difference threshold, the second electronic expansion valve is adjusted according to the target intake superheat value and the preset temperature.

[0017] In some embodiments, adjusting the second electronic expansion valve according to the target intake superheat value and the preset temperature includes:

[0018] Determine the average of the target intake superheat value and the preset temperature;

[0019] When the mean value is less than a first mean threshold, the second electronic expansion valve is adjusted according to the first mean threshold.

[0020] When the mean value is not less than the first mean value threshold, the second electronic expansion valve is adjusted according to the mean value.

[0021] In some embodiments, it also includes:

[0022] When the temperature corresponding to the current low pressure value is not greater than the unit's low pressure protection value, obtain the first step number of the second electronic expansion valve when the temperature corresponding to the current low pressure value is stable;

[0023] When the temperature corresponding to the current low pressure value is unstable, determine whether the defrosting conditions have been met;

[0024] If the condition is not met, the second electronic expansion valve is adjusted according to the first average threshold, and the second step number of the second electronic expansion valve is determined.

[0025] Based on the first step number and the second step number, the second electronic expansion valve is adjusted alternately until the defrosting conditions are met.

[0026] In some embodiments, when the operating mode is a heating mode, controlling the opening of the electronic expansion valve of the target passage based on the operating mode, the temperature corresponding to the low pressure value, the storage temperature, and the target intake superheat value includes:

[0027] When the temperature corresponding to the current low pressure value is greater than the preset temperature, the first electronic expansion valve is adjusted according to the target intake superheat value.

[0028] When the temperature corresponding to the current low pressure value is not greater than the preset temperature, and the difference between the storage temperature and the temperature corresponding to the current low pressure value is less than the difference threshold, the first electronic expansion valve is adjusted according to the target intake superheat value.

[0029] When the temperature corresponding to the current low pressure value is not greater than the preset temperature, and the difference between the storage temperature and the temperature corresponding to the current low pressure value is not less than the difference threshold, the first electronic expansion valve is adjusted according to the target intake superheat value and the preset temperature.

[0030] In some embodiments, adjusting the first electronic expansion valve according to the target intake superheat value and the preset temperature when the temperature corresponding to the current low pressure value is not greater than a preset temperature and the difference between the storage temperature and the temperature corresponding to the current low pressure value is not less than a difference threshold includes:

[0031] Determine the average of the target intake superheat value and the preset temperature;

[0032] When the mean value is less than the second mean value threshold, the first electronic expansion valve is adjusted according to the second mean value threshold.

[0033] When the mean value is not less than the second mean value threshold, the first electronic expansion valve is adjusted according to the mean value.

[0034] In some embodiments, it also includes:

[0035] When the temperature corresponding to the current low pressure value is not greater than the unit's low pressure protection value, obtain the fourth step number of the first electronic expansion valve when the temperature corresponding to the current low pressure value is stable;

[0036] When the temperature corresponding to the current low pressure value is unstable, the second solenoid valve is activated and the first solenoid valve is closed.

[0037] Adjust the second electronic expansion valve according to the second step number and the maximum step number of the second electronic expansion valve;

[0038] Check if the defrosting conditions have been met;

[0039] If the defrosting conditions are not met, the second electronic expansion valve is adjusted according to the second average threshold, and the third step of the second electronic expansion valve is determined.

[0040] Alternately switch the first solenoid valve and the second solenoid valve, and control the second electronic expansion valve and the first electronic expansion valve respectively according to the third step and the fourth step, until the defrosting conditions are met.

[0041] Secondly, embodiments of the present invention provide a control device for a dual-purpose cold storage device, the dual-purpose cold storage device including a first passage and a second passage, the first passage being provided with a first solenoid valve and a first electronic expansion valve, the second passage being provided with a second solenoid valve and a second electronic expansion valve, the refrigerant flow rate of the first electronic expansion valve being greater than the refrigerant flow rate of the second electronic expansion valve, the control device including:

[0042] The determination module is used to determine the operating mode of the dual-purpose cold storage equipment based on work requirements;

[0043] An activation module is used to activate a target path with a corresponding refrigerant flow rate according to the operating mode, wherein the target path belongs to the first path or the second path;

[0044] The acquisition module is used to acquire the temperature, storage temperature and target intake superheat value corresponding to the current low pressure value;

[0045] The control module is used to control the opening degree of the electronic expansion valve of the target passage based on the operating mode, the temperature corresponding to the current low pressure value, the storage temperature, and the target intake superheat value.

[0046] Thirdly, embodiments of the present invention provide a dual-purpose cold storage device, including a memory, a processor, a first passage, and a second passage. The first passage is provided with a first solenoid valve and a first electronic expansion valve, and the second passage is provided with a second solenoid valve and a second electronic expansion valve. The refrigerant flow rate of the first electronic expansion valve is greater than the refrigerant flow rate of the second electronic expansion valve. The memory stores a computer program, which, when executed by the processor, implements the method described in the first aspect.

[0047] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing a computer program, which, when executed by one or more processors, implements the method described in the first aspect.

[0048] Compared with the prior art, one or more embodiments of the present invention can bring at least the following beneficial effects:

[0049] This invention provides a control method, device, and dual-purpose cold storage equipment. The method includes: determining the operating mode of the dual-purpose cold storage equipment according to operational requirements; activating a target path corresponding to the refrigerant flow rate according to the operating mode, wherein the target path belongs to either the first path or the second path; acquiring the temperature corresponding to the current low pressure value, the storage temperature, and the target suction superheat value; and controlling the opening degree of the electronic expansion valve of the target path based on the operating mode, the temperature corresponding to the current low pressure value, the storage temperature, and the target suction superheat value. In the solution provided in this application, the target path corresponding to the refrigerant flow rate is activated according to the operating mode, and the opening degree of the electronic expansion valve of the target path is controlled according to the temperature corresponding to the current low pressure value, the storage temperature, and the target suction superheat value during unit operation. This ensures normal unit operation under the current operating conditions, while reducing defrosting and avoiding frequent abnormal temperature fluctuations caused by frequent defrosting. Attached Figure Description

[0050] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 This is a schematic diagram of a dual-purpose cold storage device for both heating and cooling provided in an embodiment of the present invention;

[0052] Figure 2 This is a schematic diagram of the first type of control method for a dual-purpose cold storage device provided in an embodiment of the present invention;

[0053] Figure 3 This is a schematic diagram of the second process of the control method for the dual-purpose cold storage equipment provided in this embodiment of the invention;

[0054] Figure 4 This is a schematic diagram of the third process of the control method for the dual-purpose cold storage equipment provided in the embodiments of the present invention;

[0055] Figure 5 This is a schematic diagram of the control device for a dual-purpose cold storage equipment provided in an embodiment of the present invention. Detailed Implementation

[0056] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0057] Figure 1 This diagram illustrates a structural schematic of a dual-purpose (cold storage for both heating and cooling) cold storage device provided in an embodiment of the present invention. Figure 1 As shown, the dual-purpose cold storage equipment for both heating and cooling provided in this application includes a first passage and a second passage. The first passage is equipped with a first solenoid valve 102 and a first electronic expansion valve 104, and the second passage is equipped with a second solenoid valve 103 and a second electronic expansion valve 105. The refrigerant flow rate of the first electronic expansion valve 104 is greater than the refrigerant flow rate of the second electronic expansion valve 105.

[0058] Figure 2 This illustrates a first flowchart of a control method for a dual-purpose (cold storage and heating) cold storage device provided in an embodiment of the present invention. Figure 2 As shown, the control method for the dual-purpose cold storage equipment provided in this application includes:

[0059] Step 210: Determine the operating mode of the dual-purpose cold storage equipment based on work requirements.

[0060] In this application, the working requirements may refer to refrigeration and preservation requirements, ripening requirements, etc.; the operating modes include refrigeration mode and heating mode.

[0061] In this embodiment, if the working requirement is refrigeration and preservation, the operating mode of the dual-purpose cold storage equipment is refrigeration mode; if the working requirement is ripening, the operating mode of the dual-purpose cold storage equipment is heating mode.

[0062] Step 220: According to the operating mode, activate the target path corresponding to the refrigerant flow rate, wherein the target path belongs to the first path or the second path.

[0063] In some embodiments, enabling the target passage corresponding to the refrigerant flow rate according to the operating mode includes: when the operating mode is a cooling mode, determining the second passage as the target passage, closing the first passage and enabling the second passage; when the operating mode is a heating mode, determining the first passage as the target passage, closing the second passage and enabling the first passage.

[0064] Here, when the operating mode is cooling mode, the second solenoid valve is opened and the first solenoid valve is closed; when the operating mode is heating mode, the first solenoid valve is opened and the second solenoid valve is closed.

[0065] Step 230: Obtain the temperature, storage temperature and target intake superheat value corresponding to the current low pressure value.

[0066] In this embodiment, the current low pressure value corresponds to the temperature Tc, storage temperature, target intake superheat value Tm, and unit low pressure protection value Tc1, etc.

[0067] Step 240: Based on the operating mode, according to the temperature corresponding to the current low pressure value, the storage temperature, and the target intake superheat value, control the opening degree of the electronic expansion valve of the target passage.

[0068] In some embodiments, when the operating mode is cooling mode, controlling the opening of the electronic expansion valve of the target passage based on the operating mode, the temperature corresponding to the low pressure value, the storage temperature, and the target suction superheat value includes: adjusting the second electronic expansion valve according to the target suction superheat value when the temperature corresponding to the current low pressure value is greater than a preset temperature; adjusting the second electronic expansion valve according to the target suction superheat value when the temperature corresponding to the current low pressure value is not greater than the preset temperature and the difference between the storage temperature and the temperature corresponding to the current low pressure value is less than a difference threshold; and adjusting the second electronic expansion valve according to the target suction superheat value and the preset temperature when the temperature corresponding to the current low pressure value is not greater than the preset temperature and the difference between the storage temperature and the temperature corresponding to the current low pressure value is not less than a difference threshold.

[0069] Here, the preset temperature can be 0℃, etc.; the difference threshold can be 10℃, etc.

[0070] In some embodiments, adjusting the second electronic expansion valve according to the target intake superheat value and the preset temperature includes: determining the average of the target intake superheat value and the preset temperature; adjusting the second electronic expansion valve according to the first average threshold when the average is less than the first average threshold; and adjusting the second electronic expansion valve according to the average when the average is not less than the first average threshold.

[0071] In some embodiments, the method further includes: when the temperature corresponding to the current low pressure value is not greater than the unit's low pressure protection value, obtaining the first step number of the second electronic expansion valve when the temperature corresponding to the current low pressure value is stable; when the temperature corresponding to the current low pressure value is unstable, determining whether defrosting conditions have been met; if not, adjusting the second electronic expansion valve according to the first average threshold value and determining the second step number of the second electronic expansion valve; and alternately adjusting the second electronic expansion valve according to the first step number and the second step number until defrosting conditions are met.

[0072] In some embodiments, when the operating mode is heating mode, controlling the opening of the electronic expansion valve of the target passage based on the operating mode, the temperature corresponding to the low pressure value, the storage temperature, and the target suction superheat value includes: adjusting the first electronic expansion valve according to the target suction superheat value when the temperature corresponding to the current low pressure value is greater than a preset temperature; adjusting the first electronic expansion valve according to the target suction superheat value when the temperature corresponding to the current low pressure value is not greater than the preset temperature and the difference between the storage temperature and the temperature corresponding to the current low pressure value is less than a difference threshold; and adjusting the first electronic expansion valve according to the target suction superheat value and the preset temperature when the temperature corresponding to the current low pressure value is not greater than the preset temperature and the difference between the storage temperature and the temperature corresponding to the current low pressure value is not less than a difference threshold.

[0073] In some embodiments, adjusting the first electronic expansion valve according to the target intake superheat value and the preset temperature when the temperature corresponding to the current low pressure value is not greater than a preset temperature and the difference between the storage temperature and the temperature corresponding to the current low pressure value is not less than a difference threshold includes: determining the average of the target intake superheat value and the preset temperature; adjusting the first electronic expansion valve according to the second average threshold when the average is less than a second average threshold; and adjusting the first electronic expansion valve according to the average when the average is not less than the second average threshold.

[0074] In some embodiments, the method further includes: when the temperature corresponding to the current low pressure value is not greater than the unit's low pressure protection value, obtaining the fourth step number of the first electronic expansion valve when the temperature corresponding to the current low pressure value is stable; when the temperature corresponding to the current low pressure value is unstable, opening the second solenoid valve and closing the first solenoid valve; adjusting the second electronic expansion valve according to the second step number and the maximum step number of the second electronic expansion valve; detecting whether defrosting conditions have been met; if defrosting conditions have not been met, adjusting the second electronic expansion valve according to the second average threshold value and determining the third step number of the second electronic expansion valve; alternately switching the first solenoid valve and the second solenoid valve, and controlling the second electronic expansion valve and the first electronic expansion valve respectively according to the third step number and the fourth step number until defrosting conditions are met.

[0075] As can be seen from the above, in the method provided by the present invention, the target passage with the corresponding refrigerant flow is activated according to the operating mode, and the opening of the electronic expansion valve of the target passage is controlled according to the current low pressure value, corresponding temperature, storage temperature and target suction superheat value during the unit operation process, so as to ensure that the unit operates normally under the current operating conditions, while reducing defrosting and avoiding frequent abnormal temperature fluctuations caused by frequent defrosting.

[0076] The present application will now be further explained in conjunction with a specific scenario. In this scenario, combined with Figure 3 and Figure 4 The control method of the dual-purpose cold storage equipment provided in this application is explained by taking the operation modes of the dual-purpose cold storage equipment as refrigeration mode and cooling and heating mode as examples respectively.

[0077] Figure 3 This invention illustrates a second flowchart of a control method for a dual-purpose (cold storage and heating) cold storage device provided in an embodiment of the present invention. Figure 3 For cold storage equipment that can be used for both heating and cooling, if the operating mode is refrigeration mode, such as... Figure 3 As shown, the control method for the dual-purpose cold storage equipment provided in this application includes:

[0078] Step 301: Cooling mode.

[0079] In this embodiment, it is first confirmed that the current operating mode of the dual-purpose cold storage equipment is the refrigeration mode.

[0080] Step 302: Open solenoid valve 2 (corresponding to the second solenoid valve mentioned above) and close solenoid valve 1 (corresponding to the first solenoid valve mentioned above).

[0081] In this embodiment, when it is confirmed that the operating mode of the dual-purpose cold storage equipment is the refrigeration mode, the solenoid valve 2 is opened and the solenoid valve 1 is closed, which corresponds to the above-mentioned "when the operating mode is the refrigeration mode, the second path is determined as the target path, the first path is closed and the second path is enabled".

[0082] Step 303: Tc > 0.

[0083] In this embodiment, after opening solenoid valve 2 and closing solenoid valve 1, it is determined whether Tc (the temperature corresponding to the current low pressure value) is greater than 0; if Tc > 0, then step 306 is executed to keep Tc greater than 0; if Tc is not greater than 0 (i.e., Tc is not greater than 0), then step 304 is executed.

[0084] Step 304: Tc≤Tc1.

[0085] In this embodiment, if Tc is not greater than 0 in step 303, then this step is executed, that is, it is determined whether Tc is less than or equal to Tc1 (the low-pressure protection value of the unit); if Tc≤Tc1, then step 307 is executed; if Tc is not less than Tc1 (that is, Tc is greater than Tc1), then step 305 is executed.

[0086] Step 305: Tk-Tc < 10℃.

[0087] In this embodiment, if Tc is not less than Tc1 in step 304, then it is determined whether Tk-Tc is less than 10℃; if Tk-Tc is less than 10℃, then step 309 is executed; if Tk-Tc is not less than 10℃ (i.e., Tk-Tc is not less than 10℃), then step 310 is executed.

[0088] Step 306: Adjust electronic expansion valve 2 (corresponding to the second electronic expansion valve mentioned above) according to Tm (target intake superheat value).

[0089] In this embodiment, when Tc > 0 in step 303, the electronic expansion valve 2 is adjusted according to Tm to keep Tc greater than 0. That is, this step corresponds to the above-mentioned "when the temperature corresponding to the current low pressure value is greater than the preset temperature, the second electronic expansion valve is adjusted according to the target intake superheat value".

[0090] In this embodiment, the preset temperature can be 0℃, etc.

[0091] Step 307: For 3 consecutive minutes, check if the condition Tc-0.5 < Tc < Tc+0.5 is met.

[0092] In this embodiment, when Tc≤Tc1 in step 304, it is determined whether the unit operation satisfies Tc-0.5<Tc<Tc+0.5 for 3 consecutive minutes; if it satisfies, it means that the temperature corresponding to the current low pressure value is stable, and then step 308 is executed; if it does not satisfy, it means that the temperature corresponding to the current low pressure value is unstable, and then step 311 is executed.

[0093] Step 308: Record the current electronic expansion valve step number B1 (first step number), Tm.

[0094] In this embodiment, if the condition Tc-0.5 < Tc < Tc+0.5 is satisfied for 3 consecutive minutes in step 307, then this step is executed. That is, this step corresponds to the above-mentioned "when the temperature corresponding to the current low pressure value is not greater than the low pressure protection value of the unit, obtain the first step number of the second electronic expansion valve when the temperature corresponding to the current low pressure value is stable".

[0095] Step 309: Adjust the electronic expansion valve 2 according to Tm.

[0096] In this embodiment, when Tk-Tc < 10℃ in step 305, this step is executed. That is, this step corresponds to the above-mentioned "when the temperature corresponding to the current low pressure value is not greater than the preset temperature, and the difference between the storage temperature and the temperature corresponding to the current low pressure value is less than the difference threshold, the second electronic expansion valve is adjusted according to the target intake superheat value".

[0097] In this embodiment, the difference threshold can be 10℃, etc.

[0098] Step 310: Control the electronic expansion valve 2 according to Tm1=(Tm+0) / 2.

[0099] In this embodiment, this step is executed when Tk-Tc is not less than 10℃ in step 305; wherein, Tm1 is the average of the target intake superheat value and the preset temperature, and if Tm1 < 2, then Tm1 = 2, that is, when Tm1 < 2, Tm1 defaults to a value of 2, that is, Tm1 is at least 2. That is, this step corresponds to the above "when the temperature corresponding to the current low pressure value is not greater than the preset temperature, and the difference between the storage temperature and the temperature corresponding to the current low pressure value is not less than the difference threshold, adjust the second electronic expansion valve according to the target intake superheat value and the preset temperature; the adjustment of the second electronic expansion valve according to the target intake superheat value and the preset temperature includes: determining the average of the target intake superheat value and the preset temperature; when the average is less than the first average threshold, adjusting the second electronic expansion valve according to the first average threshold; when the average is not less than the first average threshold, adjusting the second electronic expansion valve according to the average."

[0100] Step 311: Does the unit meet the defrosting requirements?

[0101] In this embodiment, when the condition Tc-0.5 < Tc < Tc+0.5 is not met for 3 consecutive minutes in step 307, that is, when the temperature corresponding to the current low pressure value is unstable, this step is executed, that is, to determine whether the unit meets the defrosting conditions. If it does, step 312 is executed; if it does not, step 313 is executed.

[0102] Step 312: Proceed to defrosting.

[0103] In this embodiment, if the unit meets the defrosting requirement in step 311, then the defrosting process begins, i.e., this step is executed. When defrosting is complete, the process returns to step 301, i.e., defrosting is complete and cooling continues.

[0104] Step 313: Adjust electronic expansion valve 2 according to Tm1=2.

[0105] In this embodiment, if the unit does not meet the defrosting requirements in step 311, this step is executed, that is, the electronic expansion valve 2 is adjusted according to Tm1=2. This step corresponds to the above-mentioned "when the temperature corresponding to the current low pressure value is unstable, determine whether the defrosting conditions are met; if not, adjust the second electronic expansion valve according to the first average threshold value".

[0106] Step 314: Record the electronic expansion valve step number B2 (second step).

[0107] In this embodiment, after adjusting the electronic expansion valve 2 according to Tm1=2 in step 313, the step number B2 of the electronic expansion valve 2 is recorded.

[0108] Step 315: Run for 10 minutes?

[0109] In this embodiment, it is determined whether the electronic expansion valve 2 maintains operation for 10 minutes at step B2; if yes, step 316 is executed; if not, the process returns to step 314, that is, the electronic expansion valve 2 continues to maintain operation at step B2 until it has run for 10 minutes, and then step 316 is executed.

[0110] Step 316: Adjust the electronic expansion valve step 2 B=B1.

[0111] In this embodiment, if the operation is maintained for 10 minutes in step 315, then this step is executed, that is, the electronic expansion valve step number B=B1 is adjusted.

[0112] Step 317: Is Tm less than 2?

[0113] In this embodiment, when the electronic expansion valve is running step 2 (B=B1), it checks whether Tm is less than 2. If Tm < 2, it executes step 318. If Tm is not less than 2, it returns to execute step 301, i.e., refrigeration.

[0114] Step 318: Run for 10 minutes?

[0115] In this embodiment, when Tm < 2 in step 317, the electronic expansion valve is maintained running for 10 minutes with step number B = B1. After running for 10 minutes, the process returns to step 311 to determine whether the unit meets the defrosting conditions. If not, steps 313 to 318 are continued until defrosting is met. This step corresponds to the above-mentioned "adjusting the second electronic expansion valve alternately according to the first step number and the second step number until the defrosting conditions are met".

[0116] Figure 4 This invention illustrates a third flowchart of the control method for a dual-purpose (cold storage and heating) cold storage device provided in an embodiment of the present invention. Figure 4 For cold storage equipment that can be used for both heating and cooling, if the operating mode is heating mode, such as Figure 4As shown, the control method for the dual-purpose cold storage equipment provided in this application includes:

[0117] Step 401: Heating mode.

[0118] In this embodiment, it is first confirmed that the current operating mode of the dual-purpose cold storage equipment is the heating mode.

[0119] Step 402: Open solenoid valve 1 (corresponding to the first solenoid valve mentioned above) and close solenoid valve 2 (corresponding to the second solenoid valve mentioned above).

[0120] In this embodiment, when it is confirmed that the operating mode of the dual-purpose cold storage equipment is the refrigeration mode, the solenoid valve 1 is opened and the solenoid valve 2 is closed, which corresponds to the above-mentioned "when the operating mode is the heating mode, the first passage is determined as the target passage, the second passage is closed and the first passage is enabled".

[0121] Step 403: Tc > 0.

[0122] In this embodiment, after opening solenoid valve 1 and closing solenoid valve 2, it is determined whether Tc (the temperature corresponding to the current low pressure value) is greater than 0; if Tc > 0, then step 406 is executed to keep Tc greater than 0; if Tc is not greater than 0 (i.e., Tc is not greater than 0), then step 404 is executed.

[0123] Step 404: Tc≤Tc1.

[0124] In this embodiment, if Tc is not greater than 0 in step 403, then this step is executed, that is, it is determined whether Tc is less than or equal to Tc1 (the low-pressure protection value of the unit); if Tc≤Tc1, then step 407 is executed; if Tc is not less than Tc1 (i.e., Tc is greater than Tc1), then step 405 is executed.

[0125] Step 405: Tk-Tc < 10℃.

[0126] In this embodiment, if Tc is not less than Tc1 in step 404, then it is determined whether Tk-Tc is less than 10℃; if Tk-Tc is less than 10℃, then step 409 is executed; if Tk-Tc is not less than 10℃ (i.e., Tk-Tc is not less than 10℃), then step 410 is executed.

[0127] Step 406: Adjust electronic expansion valve 1 (corresponding to the first electronic expansion valve mentioned above) according to Tm (target intake superheat value).

[0128] In this embodiment, when Tc > 0 in step 403, the electronic expansion valve 1 is adjusted according to Tm to keep Tc greater than 0. That is, this step corresponds to the above-mentioned "when the temperature corresponding to the current low pressure value is greater than the preset temperature, the first electronic expansion valve is adjusted according to the target intake superheat value".

[0129] In this embodiment, the preset temperature can be 0℃, etc.

[0130] Step 407: For 3 consecutive minutes, check if the condition Tc-0.5 < Tc < Tc+0.5 is met.

[0131] In this embodiment, when Tc≤Tc1 in step 404, it is determined whether the unit operation satisfies Tc-0.5<Tc<Tc+0.5 for 3 consecutive minutes; if it satisfies, it means that the temperature corresponding to the current low pressure value is stable, and then step 408 is executed; if it does not satisfy, it means that the temperature corresponding to the current low pressure value is unstable, and then step 411 is executed.

[0132] Step 408: Record the current electronic expansion valve step number B4 (fourth step), Tm.

[0133] In this embodiment, if for 3 consecutive minutes in step 407, Tc-0.5 < Tc < Tc+0.5 is satisfied, then this step is executed. That is, this step corresponds to the "fourth step of the first electronic expansion valve when the temperature corresponding to the current low pressure value is not greater than the unit's low pressure protection value (Tc1)" mentioned above.

[0134] Step 409: Adjust the electronic expansion valve 1 according to Tm.

[0135] In this embodiment, when Tk-Tc < 10℃ in step 405, this step is executed. That is, this step corresponds to the above-mentioned "when the temperature corresponding to the current low pressure value is not greater than the preset temperature, and the difference between the storage temperature and the temperature corresponding to the current low pressure value is less than the difference threshold, the first electronic expansion valve is adjusted according to the target intake superheat value".

[0136] In this embodiment, the difference threshold can be 10℃, etc.

[0137] Step 410: Control the electronic expansion valve 1 according to Tm1=(Tm+0) / 2.

[0138] In this embodiment, this step is executed when Tk-Tc is not less than 10℃ in step 405; wherein, Tm1 is the average of the target intake superheat value and the preset temperature, and if Tm1 < 1, then Tm1 = 1, that is, when Tm1 < 1, Tm1 defaults to a value of 1, that is, Tm1 is at least 1. That is, this step corresponds to the above-mentioned "when the temperature corresponding to the current low pressure value is not greater than the preset temperature, and the difference between the storage temperature and the temperature corresponding to the current low pressure value is not less than the difference threshold, adjust the first electronic expansion valve according to the target intake superheat value and the preset temperature; adjust the first electronic expansion valve according to the target intake superheat value and the preset temperature, including: determining the average of the target intake superheat value and the preset temperature; when the average is less than the second average threshold, adjust the first electronic expansion valve according to the second average threshold; when the average is not less than the second average threshold, adjust the first electronic expansion valve according to the average value".

[0139] Step 411: Open solenoid valve 2 and close solenoid valve 1.

[0140] In this embodiment, when the condition Tc-0.5 < Tc < Tc+0.5 is not met for 3 consecutive minutes in step 407, that is, when the temperature corresponding to the current low pressure value is unstable, this step is executed, that is, solenoid valve 2 is opened and solenoid valve 1 is closed, which means reducing the refrigerant flow rate; that is, this step corresponds to "when the temperature corresponding to the current low pressure value is unstable, the second solenoid valve is opened and the first solenoid valve is closed" mentioned above.

[0141] Step 412: B2 / Electronic expansion valve maximum number of steps < 40%.

[0142] In this embodiment, after opening solenoid valve 2 and closing solenoid valve 1 in step 411, it is determined whether the maximum number of steps for B2 / electronic expansion valve is less than 40%; if yes, step 413 is executed; if not, step 414 is executed. That is, this step corresponds to "adjusting the second electronic expansion valve according to the second number of steps and the maximum number of steps for the second electronic expansion valve" mentioned above.

[0143] Step 413: The electronic expansion valve 2 opens at step B3 (the third step).

[0144] In this embodiment, when the maximum number of steps for B2 / electronic expansion valve in step 412 is less than 40%, this step is executed, that is, the number of steps for opening electronic expansion valve 2 is B3.

[0145] Step 414: Electronic expansion valve 2 opens 40%.

[0146] In this embodiment, when the maximum number of steps of B2 / electronic expansion valve in step 412 is not less than 40%, this step is executed, that is, the electronic expansion valve 2 is opened by 40%.

[0147] Step 415: Does the unit meet the defrosting requirements?

[0148] In this embodiment, after the electronic expansion valve 2 is adjusted in steps 413 and 414, this step is executed, that is, to determine whether the unit meets the defrosting requirements; if it does, step 416 is executed; if it does not, step 417 is executed.

[0149] Step 416: Proceed to defrosting.

[0150] In this embodiment, if the unit meets the defrosting requirement in step 415, then the defrosting process begins, i.e., this step is executed. When defrosting is complete, the process returns to step 401, i.e., defrosting is complete and heating continues.

[0151] Step 417: Adjust electronic expansion valve 2 according to Tm1=1.

[0152] In this embodiment, if the unit does not meet the defrosting requirements in step 415, this step is executed, that is, the electronic expansion valve 2 is adjusted according to Tm1=1. That is, this step corresponds to "detecting whether the defrosting conditions are met; if the defrosting conditions are not met, adjusting the second electronic expansion valve according to the second average threshold value" mentioned above.

[0153] Step 418: Record the electronic expansion valve step number B3 (third step).

[0154] In this embodiment, after adjusting the electronic expansion valve 2 according to Tm1=1 in step 417, the step number B3 of the electronic expansion valve 2 is recorded.

[0155] Step 419: Run for 10 minutes?

[0156] In this embodiment, it is determined whether the electronic expansion valve 2 has been running for 10 minutes at step B3; if so, step 420 is executed; if not, the process returns to step 418, that is, the electronic expansion valve 2 continues to run at step B2 until it has been running for 10 minutes, and then step 420 is executed.

[0157] Step 420: Open solenoid valve 1, close solenoid valve 2, and adjust electronic expansion valve 1 step number B=B4.

[0158] In this embodiment, when the operation is maintained for 10 minutes in step 419, this step is executed, that is, solenoid valve 1 is opened, solenoid valve 2 is closed, and the electronic expansion valve 1 is adjusted to step B=B4.

[0159] Step 421: Is Tm less than 1?

[0160] In this embodiment, when solenoid valve 1 is opened, solenoid valve 2 is closed, and the electronic expansion valve 1 is adjusted to step B=B4, it is detected whether Tm is less than 1. If Tm<1, then step 422 is executed; if Tm is not less than 1, then step 401 is executed, that is, heating is performed.

[0161] Step 422: Run for 10 minutes?

[0162] In this embodiment, when Tm < 1 in step 421, the solenoid valve 1 remains open, solenoid valve 2 is closed, and the electronic expansion valve 1 is adjusted to step B = B4 and run for 10 minutes. After running for 10 minutes, the process returns to step 415 to determine whether the unit meets the defrosting conditions. If not, steps 417 to 422 are continued until defrosting is met. That is, this step corresponds to the above-mentioned "alternating switching of the first and second solenoid valves, controlling the second and first electronic expansion valves according to the third and fourth steps respectively, until the defrosting conditions are met."

[0163] Based on the above scenario, it can be seen that in this application, the target passage with the corresponding refrigerant flow is activated according to the operating mode, and the opening of the electronic expansion valve of the target passage is controlled according to the current low pressure value, corresponding temperature, storage temperature and target suction superheat value during the unit operation process, so as to ensure that the unit operates normally under the current operating conditions, while reducing defrosting and avoiding frequent abnormal temperature fluctuations caused by frequent defrosting.

[0164] Accordingly, embodiments of the present invention also provide a control device for a dual-purpose cold storage equipment; Figure 5 A schematic diagram of a control device for a dual-purpose cold storage unit is shown. In this embodiment, the dual-purpose cold storage unit includes a first passage and a second passage. The first passage is equipped with a first solenoid valve and a first electronic expansion valve, and the second passage is equipped with a second solenoid valve and a second electronic expansion valve. The refrigerant flow rate of the first electronic expansion valve is greater than the refrigerant flow rate of the second electronic expansion valve.

[0165] like Figure 5 As shown, the control device for the dual-purpose cold storage equipment includes:

[0166] The determination module 510 is used to determine the operating mode of the dual-purpose cold storage equipment based on work requirements;

[0167] The activation module 520 is used to activate the target path corresponding to the refrigerant flow rate according to the operating mode, wherein the target path belongs to the first path or the second path;

[0168] The acquisition module 530 is used to acquire the temperature, storage temperature and target intake superheat value corresponding to the current low pressure value;

[0169] The control module 540 is used to control the opening degree of the electronic expansion valve of the target passage based on the operating mode, the temperature corresponding to the current low pressure value, the storage temperature, and the target intake superheat value.

[0170] In some embodiments, the enabling module 520 is further configured to, when the operating mode is cooling mode, determine the second path as the target path, close the first path and enable the second path; when the operating mode is heating mode, determine the first path as the target path, close the second path and enable the first path.

[0171] In some embodiments, when the operating mode is a cooling mode, the control module 540 is further configured to: adjust the second electronic expansion valve according to the target suction superheat value when the temperature corresponding to the current low pressure value is greater than the preset temperature; adjust the second electronic expansion valve according to the target suction superheat value when the temperature corresponding to the current low pressure value is not greater than the preset temperature and the difference between the storage temperature and the temperature corresponding to the current low pressure value is less than a difference threshold; and adjust the second electronic expansion valve according to the target suction superheat value and the preset temperature when the temperature corresponding to the current low pressure value is not greater than the preset temperature and the difference between the storage temperature and the temperature corresponding to the current low pressure value is not less than a difference threshold.

[0172] In some embodiments, when the operating mode is a heating mode, the control module 540 is further configured to: adjust the first electronic expansion valve according to the target intake superheat value when the temperature corresponding to the current low pressure value is greater than the preset temperature; adjust the first electronic expansion valve according to the target intake superheat value when the temperature corresponding to the current low pressure value is not greater than the preset temperature and the difference between the storage temperature and the temperature corresponding to the current low pressure value is less than a difference threshold; and adjust the first electronic expansion valve according to the target intake superheat value and the preset temperature when the temperature corresponding to the current low pressure value is not greater than the preset temperature and the difference between the storage temperature and the temperature corresponding to the current low pressure value is not less than a difference threshold.

[0173] That is, the control device of the dual-purpose cold storage equipment provided in this embodiment of the invention enables the target passage with the corresponding refrigerant flow according to the operating mode, and controls the opening of the electronic expansion valve of the target passage according to the temperature, storage temperature and target suction superheat value corresponding to the current low pressure value during the unit operation, so as to ensure that the unit operates normally under the current operating conditions, while reducing defrosting and avoiding frequent abnormal temperature fluctuations caused by frequent defrosting.

[0174] Those skilled in the art will understand that the above-described modules or steps can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. Optionally, they can be implemented using computer-executable program code, thereby storing them in a storage device for execution by the computing device, or fabricating them separately as individual integrated circuit modules, or fabricating multiple modules or steps into a single integrated circuit module. This invention is not limited to any specific hardware and software combination.

[0175] Accordingly, embodiments of the present invention also provide a cold storage device that can be used for both heating and cooling; Figure 1 This diagram illustrates a structural schematic of a dual-purpose (heating and cooling) cold storage device; for example... Figure 1 As shown, the dual-purpose cold storage device for both heating and cooling provided in this embodiment of the invention includes a memory, a processor, a first passage, and a second passage. The first passage is equipped with a first solenoid valve 102 and a first electronic expansion valve 104, and the second passage is equipped with a second solenoid valve 103 and a second electronic expansion valve 105. The refrigerant flow rate of the first electronic expansion valve 104 is greater than the refrigerant flow rate of the second electronic expansion valve 105. The memory stores a computer program, and when the computer program is executed by the processor, it implements the control method for the dual-purpose cold storage device for both heating and cooling as described in the above embodiment.

[0176] In this embodiment, the dual-purpose cold storage equipment also includes a compressor 101, a suction pressure sensor 106, a discharge pressure sensor 107, a suction temperature sensor 108, a four-way reversing valve 109, a condenser 110, and an evaporator 111.

[0177] In this embodiment, the processor is the control center of the dual-purpose cold storage equipment. It connects various parts of the entire dual-purpose cold storage equipment through various interfaces and lines. By running or loading software programs and / or modules stored in the memory, and calling data stored in the memory, it executes various functions of the dual-purpose cold storage equipment and processes data, thereby performing overall monitoring of the dual-purpose cold storage equipment.

[0178] In this embodiment, the processor may be implemented as an application-specific integrated circuit (ASNC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field-programmable gate array (FPGA), a controller, a microcontroller, a microprocessor, or other electronic components, and is used to execute the methods in the above embodiments. The methods implemented when the computer program running on the processor is executed can be referred to the specific embodiments of the methods provided in the foregoing embodiments of this invention, and will not be repeated here.

[0179] Accordingly, embodiments of the present invention also provide a computer-readable storage medium storing a computer program, which, when executed by one or more processors, implements the method described in the above embodiments:

[0180] The operating mode of the dual-purpose cold storage equipment is determined according to the work requirements;

[0181] According to the operating mode, the target passage with the corresponding refrigerant flow is activated, and the target passage belongs to the first passage or the second passage;

[0182] Obtain the current low pressure value, corresponding temperature, storage temperature, and target intake superheat value;

[0183] Based on the operating mode, the opening degree of the electronic expansion valve of the target passage is controlled according to the temperature corresponding to the current low pressure value, the storage temperature, and the target intake superheat value.

[0184] It should be noted that the computer-readable storage medium described above in this invention can be a computer-readable signal medium, a computer-readable storage medium, or any combination thereof. For example, a computer-readable storage medium can be, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this application, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this application, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium can be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to: wires, optical fibers, RF (radio frequency), etc., or any suitable combination thereof.

[0185] Accordingly, embodiments of the present invention may also include a computer program product, which includes a computer program or instructions. The computer instructions are stored in a computer-readable storage medium, and when the computer program or instructions are executed by a processor, they implement the control method of the dual-purpose cold storage equipment described in any of the above embodiments.

[0186] This invention provides a control method, device, and dual-purpose cold storage equipment. The method includes: determining the operating mode of the dual-purpose cold storage equipment according to operational requirements; activating a target path corresponding to the refrigerant flow rate according to the operating mode, wherein the target path belongs to either the first path or the second path; acquiring the temperature corresponding to the current low pressure value, the storage temperature, and the target suction superheat value; and controlling the opening degree of the electronic expansion valve of the target path based on the operating mode, the temperature corresponding to the current low pressure value, the storage temperature, and the target suction superheat value. In the solution provided in this application, the target path corresponding to the refrigerant flow rate is activated according to the operating mode, and the opening degree of the electronic expansion valve of the target path is controlled according to the temperature corresponding to the current low pressure value, the storage temperature, and the target suction superheat value during unit operation. This ensures normal unit operation under the current operating conditions, while reducing defrosting and avoiding frequent abnormal temperature fluctuations caused by frequent defrosting.

[0187] In the embodiments provided in this invention, it should be understood that the disclosed systems and methods can also be implemented in other ways. The system and method embodiments described above are merely illustrative.

[0188] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0189] Furthermore, while the operations are described in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or in sequential order. In certain circumstances, multitasking and parallel processing may be advantageous. Similarly, while several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the invention. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments.

[0190] Although the embodiments disclosed in this invention are as described above, the content is merely for the purpose of facilitating understanding of the invention and is not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and variations in form and detail of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection for this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A control method for a dual-purpose (heating and cooling) cold storage device, characterized in that, The dual-purpose cold storage equipment includes a first passage and a second passage. The first passage is equipped with a first solenoid valve and a first electronic expansion valve, and the second passage is equipped with a second solenoid valve and a second electronic expansion valve. The refrigerant flow rate of the first electronic expansion valve is greater than the refrigerant flow rate of the second electronic expansion valve. The method includes: The operating mode of the dual-purpose cold storage equipment is determined according to the work requirements; According to the operating mode, the target passage with the corresponding refrigerant flow is activated, and the target passage belongs to the first passage or the second passage; Obtain the current low pressure value, corresponding temperature, storage temperature, and target intake superheat value; Based on the operating mode, the opening degree of the electronic expansion valve of the target passage is controlled according to the temperature corresponding to the current low pressure value, the storage temperature, and the target intake superheat value. The step of activating the target path corresponding to the refrigerant flow rate according to the operating mode includes: When the operating mode is cooling mode, the second path is identified as the target path, the first path is closed and the second path is enabled; When the operating mode is heating mode, the first path is determined as the target path, the second path is closed and the first path is enabled; When the operating mode is cooling mode, the step of controlling the opening of the electronic expansion valve of the target passage based on the operating mode, the temperature corresponding to the low pressure value, the storage temperature, and the target suction superheat value includes: When the temperature corresponding to the current low pressure value is greater than the preset temperature, the second electronic expansion valve is adjusted according to the target intake superheat value. When the temperature corresponding to the current low pressure value is not greater than the preset temperature, and the difference between the storage temperature and the temperature corresponding to the current low pressure value is less than the difference threshold, the second electronic expansion valve is adjusted according to the target intake superheat value. When the temperature corresponding to the current low pressure value is not greater than the preset temperature, and the difference between the storage temperature and the temperature corresponding to the current low pressure value is not less than the difference threshold, the second electronic expansion valve is adjusted according to the target intake superheat value and the preset temperature.

2. The method according to claim 1, characterized in that, The step of adjusting the second electronic expansion valve according to the target intake superheat value and the preset temperature includes: Determine the average of the target intake superheat value and the preset temperature; When the mean value is less than a first mean threshold, the second electronic expansion valve is adjusted according to the first mean threshold. When the mean value is not less than the first mean value threshold, the second electronic expansion valve is adjusted according to the mean value.

3. The method according to claim 2, characterized in that, Also includes: When the temperature corresponding to the current low pressure value is not greater than the unit's low pressure protection value, obtain the first step number of the second electronic expansion valve when the temperature corresponding to the current low pressure value is stable; When the temperature corresponding to the current low pressure value is unstable, determine whether the defrosting conditions have been met; If the condition is not met, the second electronic expansion valve is adjusted according to the first average threshold, and the second step number of the second electronic expansion valve is determined. Based on the first step number and the second step number, the second electronic expansion valve is adjusted alternately until the defrosting conditions are met.

4. The method according to claim 3, characterized in that, When the operating mode is heating mode, the step of controlling the opening of the electronic expansion valve of the target passage based on the operating mode, the temperature corresponding to the low pressure value, the storage temperature, and the target intake superheat value includes: When the temperature corresponding to the current low pressure value is greater than the preset temperature, the first electronic expansion valve is adjusted according to the target intake superheat value. When the temperature corresponding to the current low pressure value is not greater than the preset temperature, and the difference between the storage temperature and the temperature corresponding to the current low pressure value is less than the difference threshold, the first electronic expansion valve is adjusted according to the target intake superheat value. When the temperature corresponding to the current low pressure value is not greater than the preset temperature, and the difference between the storage temperature and the temperature corresponding to the current low pressure value is not less than the difference threshold, the first electronic expansion valve is adjusted according to the target intake superheat value and the preset temperature.

5. The control method for the dual-purpose cold storage equipment according to claim 4, characterized in that, When the temperature corresponding to the current low pressure value is not greater than a preset temperature, and the difference between the storage temperature and the temperature corresponding to the current low pressure value is not less than a difference threshold, adjusting the first electronic expansion valve according to the target intake superheat value and the preset temperature includes: Determine the average of the target intake superheat value and the preset temperature; When the mean value is less than the second mean value threshold, the first electronic expansion valve is adjusted according to the second mean value threshold. When the mean value is not less than the second mean value threshold, the first electronic expansion valve is adjusted according to the mean value.

6. The method according to claim 5, characterized in that, Also includes: When the temperature corresponding to the current low pressure value is not greater than the unit's low pressure protection value, obtain the fourth step number of the first electronic expansion valve when the temperature corresponding to the current low pressure value is stable; When the temperature corresponding to the current low pressure value is unstable, the second solenoid valve is activated and the first solenoid valve is closed. Adjust the second electronic expansion valve according to the second step number and the maximum step number of the second electronic expansion valve; Check if the defrosting conditions have been met; If the defrosting conditions are not met, the second electronic expansion valve is adjusted according to the second average threshold, and the third step of the second electronic expansion valve is determined. Alternately switch the first solenoid valve and the second solenoid valve, and control the second electronic expansion valve and the first electronic expansion valve respectively according to the third step and the fourth step, until the defrosting conditions are met.

7. A control device for a dual-purpose cold storage facility, characterized in that, The dual-purpose cold storage equipment includes a first passage and a second passage. The first passage is equipped with a first solenoid valve and a first electronic expansion valve, and the second passage is equipped with a second solenoid valve and a second electronic expansion valve. The refrigerant flow rate of the first electronic expansion valve is greater than the refrigerant flow rate of the second electronic expansion valve. The control device includes: The determination module is used to determine the operating mode of the dual-purpose cold storage equipment based on work requirements; An activation module is used to activate a target path with a corresponding refrigerant flow rate according to the operating mode, wherein the target path belongs to the first path or the second path; The acquisition module is used to acquire the temperature, storage temperature and target intake superheat value corresponding to the current low pressure value; The control module is used to control the opening degree of the electronic expansion valve of the target passage based on the operating mode, the temperature corresponding to the current low pressure value, the storage temperature, and the target intake superheat value. The step of activating the target path corresponding to the refrigerant flow rate according to the operating mode includes: When the operating mode is cooling mode, the second path is identified as the target path, the first path is closed and the second path is enabled; When the operating mode is heating mode, the first path is determined as the target path, the second path is closed and the first path is enabled; When the operating mode is cooling mode, the step of controlling the opening of the electronic expansion valve of the target passage based on the operating mode, the temperature corresponding to the low pressure value, the storage temperature, and the target suction superheat value includes: When the temperature corresponding to the current low pressure value is greater than the preset temperature, the second electronic expansion valve is adjusted according to the target intake superheat value. When the temperature corresponding to the current low pressure value is not greater than the preset temperature, and the difference between the storage temperature and the temperature corresponding to the current low pressure value is less than the difference threshold, the second electronic expansion valve is adjusted according to the target intake superheat value. When the temperature corresponding to the current low pressure value is not greater than the preset temperature, and the difference between the storage temperature and the temperature corresponding to the current low pressure value is not less than the difference threshold, the second electronic expansion valve is adjusted according to the target intake superheat value and the preset temperature.

8. A cold storage device that can be used for both heating and cooling, characterized in that, The device includes a memory, a processor, a first passage, and a second passage. The first passage is equipped with a first solenoid valve and a first electronic expansion valve, and the second passage is equipped with a second solenoid valve and a second electronic expansion valve. The refrigerant flow rate of the first electronic expansion valve is greater than the refrigerant flow rate of the second electronic expansion valve. The memory stores a computer program, which, when executed by the processor, implements the method as described in any one of claims 1 to 6.

Images