Cold storage system, control method for cold storage system, and storage medium

Abstract

A cold storage system, a control method for the cold storage system, and a storage medium. The cold storage system comprises: an outdoor unit (100), a refrigerant adjustment device (200) and an energy storage device (300). The outdoor unit (100) comprises a liquid side main pipe (101), a gas side main pipe (102) and a low pressure pipe (103). The refrigerant adjustment device (200) comprises a refrigerant storage member (210), a first pipe assembly (220) and a second pipe assembly (230). An inlet of the first pipe assembly (220) is communicated with the refrigerant storage member (210); an outlet of the first pipe assembly (220) is communicated with the low pressure pipe (103); an inlet of the second pipe assembly (230) is communicated with the liquid side main pipe (101); and an outlet of the second pipe assembly (230) is communicated with the refrigerant storage member (210) and the first pipe assembly (220). The energy storage device (300) is arranged in parallel between the liquid side main pipe (101) and the gas side main pipe (102).

Description

Cold storage system, control method of cold storage system, and storage medium

[0001] Related applications

[0002] This application claims priority to Chinese patent application number 202311873529.X, filed on December 29, 2023, entitled “Cold storage system, control method for cold storage system and storage medium,” the entire text of which is hereby incorporated by reference. Technical Field

[0003] The present application relates to the field of cold storage technology, and in particular to a cold storage system, a control method for the cold storage system, and a storage medium. Background Art

[0004] Multi-split air conditioners typically connect multiple indoor units via one or more outdoor units. They are widely used in densely populated areas such as shopping malls and office buildings. During operation, multi-split cold storage systems often experience inappropriate refrigerant circulation rates, which can affect the lifespan, operational status, and performance of the cold storage system.

[0005] In related technologies, multi-split cold storage systems often use a single parameter to determine whether the amount of refrigerant in the current cold storage system is appropriate. However, the accuracy of this judgment method is low, and there are problems such as untimely adjustment of the refrigerant amount in the multi-split cold storage system and low system cold storage efficiency.

[0006] Summary of the Invention

[0007] The present application provides a cold storage system, a control method for the cold storage system, and a storage medium to solve the technical problems of untimely adjustment of refrigerant circulation volume and low cold storage efficiency in traditional cold storage systems.

[0008] To this end, in a first aspect, an embodiment of the present application provides a cold storage system, comprising:

[0009] Outdoor unit, including liquid side main pipe, gas side main pipe and low-pressure pipe;

[0010] A refrigerant conditioning device comprising a refrigerant storage element, a first pipe assembly, and a second pipe assembly, wherein the inlet of the first pipe assembly is connected to the refrigerant storage element, the outlet of the first pipe assembly is connected to the low-pressure pipe, the inlet of the second pipe assembly is connected to the liquid-side main pipe, and the outlet of the second pipe assembly is connected to the refrigerant storage element and the first pipe assembly; and

[0011] The energy storage device is arranged in parallel between the liquid side main pipe and the gas side main pipe.

[0012] In one possible embodiment, the first pipeline assembly includes a balancing valve, a pressure relief valve, a first pipeline and a second pipeline, the first pipeline connects the refrigerant storage element and the low-pressure pipeline, the second pipeline connects the refrigerant storage element and the first pipeline, the balancing valve is arranged in the first pipeline, and the pressure relief valve is arranged in the second pipeline.

[0013] In one possible embodiment, the second pipeline assembly includes a first valve body, a second valve body, a third pipeline and a fourth pipeline, the third pipeline connects the liquid side main pipe and the refrigerant storage component, the fourth pipeline connects the third pipeline and the first pipeline, the first valve body is arranged in the third pipeline, and the second valve body is arranged in the fourth pipeline.

[0014] In a possible implementation, the first pipe and the second pipe are connected to the top of the refrigerant storage element, and the third pipe is connected to the bottom of the refrigerant storage element.

[0015] In a possible implementation, the energy storage device includes an energy storage component, a third pipeline assembly, and a fourth pipeline assembly. The third pipeline assembly connects the liquid side main pipe and the energy storage component, and the fourth pipeline assembly connects the energy storage component and the gas side main pipe.

[0016] In a possible embodiment, the third pipeline assembly includes a third valve body, a fourth valve body, a fifth pipeline and a sixth pipeline, the inlet of the fifth pipeline is connected to the liquid side main pipe, the outlet of the fifth pipeline is connected to the energy storage component, the sixth pipeline connects the fifth pipeline and the fourth pipeline assembly, the third valve body is arranged in the fifth pipeline, and the fourth valve body is arranged in the sixth pipeline.

[0017] In a possible embodiment, the third pipeline assembly also includes a fifth valve body, a sixth valve body and a seventh pipeline, the inlet of the seventh pipeline is connected to the energy storage component, the outlet of the seventh pipeline is connected to the liquid side main pipe located behind the fifth pipeline, the fifth valve body is arranged on the seventh pipeline, and the sixth valve body is arranged on the liquid side main pipe located between the fifth pipeline and the seventh pipeline.

[0018] In a possible implementation, the fourth pipeline assembly includes a seventh valve body and an eighth pipeline, the eighth pipeline is connected to the energy storage component and the gas side main pipe, and the seventh valve body is arranged in the eighth pipeline.

[0019] In a possible embodiment, the outdoor unit also includes a compressor, a four-way valve and an expansion valve, the outlet of the compressor is connected to the D port of the four-way valve, the S port of the four-way valve is connected to the inlet of the compressor, the C port of the four-way valve is connected to the gas side main pipe, the E port of the four-way valve is connected to the expansion valve, the outlet of the expansion valve is connected to the liquid side main pipe, and the low-pressure pipeline is connected to the inlet of the compressor.

[0020] In a second aspect, the present application further provides a control method applied to the above-mentioned cold storage system, comprising:

[0021] Get the operating time of the cold storage system;

[0022] If the running time is greater than the preset time, obtaining a first temperature of the energy storage material in the energy storage device;

[0023] If the first temperature is less than or equal to a first preset temperature and greater than a second preset temperature, controlling the refrigerant adjustment device to enter a first operating mode, wherein the first preset temperature is greater than the second preset temperature;

[0024] If the first temperature is less than or equal to the second preset temperature, the refrigerant adjustment device is controlled to enter the second operation mode.

[0025] In one possible implementation, the first operation mode includes:

[0026] Obtaining the exhaust superheat of the outdoor unit; if the exhaust superheat is less than a preset superheat value, controlling the balancing valve and the first valve body of the refrigerant adjustment device to open, the second valve body to close, and continuing to inject liquid for a first time period;

[0027] Determining whether the cold storage system is over-fluorinated, and if so, controlling the balance valve and the first valve body of the refrigerant adjustment device to open, the second valve body to close, and continuing to inject liquid for a second time period;

[0028] Determine whether the cold storage system is short of fluorine. If so, control the balancing valve and the first valve body of the refrigerant adjustment device to close, the second valve body to open, and continue draining for a third time period.

[0029] In a possible implementation manner, the exhaust gas superheat being less than a preset superheat value includes:

[0030] The exhaust temperature of the compressor and the high-pressure temperature in the compressor are obtained. If the difference between the exhaust temperature and the high-pressure temperature is greater than a preset difference, it is determined that the exhaust superheat is less than a preset superheat value.

[0031] In one possible implementation, determining whether the cold storage system has excessive fluorine includes:

[0032] obtaining a high-pressure temperature of the cold storage system as a second temperature, obtaining a superheat degree of a heat exchanger of the energy storage device as a third temperature, and simultaneously obtaining a minimum exhaust gas superheat degree of the cold storage system as a fourth temperature;

[0033] If the second temperature is greater than the first preset temperature, the third temperature is less than the second preset temperature, and the fourth temperature is less than the third preset temperature, it is determined that the first refrigerant circulation amount is greater than the first preset circulation amount.

[0034] In one possible implementation, determining whether the cold storage system is deficient in fluorine includes:

[0035] obtaining a superheat degree of the energy storage device as a fifth temperature, obtaining an opening degree of an expansion valve of the energy storage device as a first opening degree, and obtaining a difference between a high-pressure temperature of the cold storage system and an ambient temperature as a sixth temperature;

[0036] If the fifth temperature is greater than the fourth preset temperature, the first opening is greater than the first preset opening, and the sixth temperature is less than the fifth preset temperature, it is determined that the first refrigerant circulation amount is less than the first preset circulation amount.

[0037] In one possible implementation, the second operation mode includes:

[0038] determining whether the cold storage system is over-fluorinated, and if so, controlling the balancing valve and the first valve body of the refrigerant adjustment device to open, the second valve body to close, and continuing to inject liquid for a fourth time period;

[0039] Determine whether the cold storage system is short of fluorine. If so, control the balancing valve and the first valve body of the refrigerant adjustment device to close, the second valve body to open, and continue draining for a fifth time period.

[0040] In one possible implementation, determining whether the cold storage system has excessive fluorine includes:

[0041] The high-pressure temperature of the cold storage system is obtained as the seventh temperature, the superheat of the heat exchanger of the energy storage device is obtained as the eighth temperature, and the minimum exhaust superheat of the cold storage system is obtained as the ninth temperature;

[0042] If the seventh temperature is greater than the sixth preset temperature, the eighth temperature is less than the seventh preset temperature, and the ninth temperature is less than the eighth preset temperature, it is determined that the second refrigerant circulation amount is greater than the second preset circulation amount.

[0043] In one possible implementation, determining whether the cold storage system is deficient in fluorine includes:

[0044] The superheat of the energy storage device is obtained as a tenth temperature, the difference between the high-pressure temperature of the cold storage system and the ambient temperature is obtained as an eleventh temperature, and the high-pressure temperature of the cold storage system is obtained as a twelfth temperature;

[0045] If the tenth temperature is greater than the ninth preset temperature, the eleventh temperature is less than the tenth preset temperature, and the twelfth temperature is less than the eleventh preset temperature, it is determined that the first refrigerant circulation amount is less than the first preset circulation amount.

[0046] In a possible implementation manner, determining whether the cold storage system is deficient in fluorine further includes:

[0047] obtaining an expansion valve opening of the energy storage device as a second opening;

[0048] If the second opening is greater than the second preset opening, the balancing valve and the first valve body of the refrigerant adjustment device are controlled to close, the second valve body is controlled to open, and the liquid is continuously discharged for a sixth period of time;

[0049] If the second opening is smaller than the third preset opening, the air pressure valve and the first valve body of the refrigerant adjustment device are controlled to open, the balancing valve and the second valve body are closed, and the liquid is continuously introduced for the seventh period; wherein the third preset opening is smaller than the second preset opening.

[0050] In a possible implementation, the method further includes:

[0051] If the running time is less than or equal to the preset time, the refrigerant adjustment device is controlled to enter the third operation mode.

[0052] In one possible implementation, the third operation mode includes:

[0053] Controlling the balancing valve and the first valve body of the refrigerant adjustment device to close, the second valve body to open, and continuously draining the liquid for an eighth period;

[0054] The balancing valve and the first valve body of the refrigerant adjustment device are controlled to open, the second valve body is closed, and the liquid is continuously introduced for the ninth time period.

[0055] In a third aspect, an embodiment of the present application further provides a storage medium, in which a computer program is stored. The computer program is configured to execute the control method of the cold storage system as described above when running.

[0056] According to the embodiments of the present application, a cold storage system, a control method for a cold storage system, and a storage medium are provided. The cold storage system includes: an outdoor unit including a liquid-side main pipe, a gas-side main pipe, and a low-pressure pipeline; a refrigerant adjustment device including a refrigerant storage element, a first pipe assembly, and a second pipe assembly, wherein the inlet of the first pipe assembly is connected to the refrigerant storage element, the outlet of the first pipe assembly is connected to the low-pressure pipeline, the inlet of the second pipe assembly is connected to the liquid-side main pipe, and the outlet of the second pipe assembly is connected to the refrigerant storage element and the first pipe assembly; and an energy storage device, which is arranged in parallel between the liquid-side main pipe and the gas-side main pipe. The technical solution of the present application, by adding a refrigerant adjustment device between the outdoor unit and the energy storage device, can achieve timely adjustment of the amount of circulating refrigerant in each stage of the cold storage system, thereby improving the cold storage efficiency and performance of the cold storage system. In addition, the refrigerant adjustment device is arranged on the medium-pressure side and low-pressure side of the outdoor unit and the energy storage device, so that the refrigerant in the refrigerant adjustment device can flow in and out smoothly, thereby improving the adjustment stability and adjustment reliability of the refrigerant adjustment device. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The drawings herein are incorporated into and constitute a part of the specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. One or more embodiments are exemplified by the pictures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute a scale limitation.

[0058] FIG1 is a schematic diagram of a cold storage system provided in an embodiment of the present application;

[0059] FIG2 is a schematic diagram of a first liquid inlet method of a refrigerant adjustment device of a cold storage system provided in an embodiment of the present application, wherein the direction of the arrow indicates the direction of the refrigerant circulation loop;

[0060] FIG3 is a schematic diagram of a second liquid inlet method of a refrigerant adjustment device of a cold storage system provided in an embodiment of the present application, wherein the direction of the arrow indicates the direction of the refrigerant circulation loop;

[0061] FIG4 is a schematic diagram of a discharge method of a refrigerant adjustment device of a cold storage system provided in an embodiment of the present application, wherein the direction of the arrow indicates the direction of the refrigerant circulation loop;

[0062] FIG5 is a flow chart of a control method for a cold storage system according to an embodiment of the present application.

[0063] Explanation of the reference numerals: 100, outdoor unit; 101, liquid side main pipe; 102, gas side main pipe; 103, low-pressure pipeline; 110, compressor; 120, four-way valve; 130, expansion valve; 140, heat exchanger; 150, gas-liquid separator; 200, refrigerant adjustment device; 210, refrigerant storage component; 220, first pipeline assembly; 221, balancing valve; 222, pressure relief valve; 223, first pipeline; 224, second pipeline; 230, second pipeline assembly; 231, first valve body; 232, second valve body; 233, third pipeline; 234, fourth pipeline; 300, energy storage device; 310, energy storage component; 320, third pipeline assembly; 321, third valve body; 322, fourth valve body; 323, Fifth pipeline; 324, sixth pipeline; 325, fifth valve body; 326, sixth valve body; 327, seventh pipeline; 330, fourth pipeline assembly; 331, seventh valve body; 332, eighth pipeline. DETAILED DESCRIPTION

[0064] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0065] The disclosure below provides many different embodiments or examples for realizing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the applicability of other processes and / or the use of other materials.

[0066] For ease of description, spatially relative terms may be used herein to describe the relative position or movement of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," "above," "front," "back," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figures undergoes a positional flip or a change in posture or a change in motion, then these directional indications will also change accordingly. For example, an element described as "below" or "below" another element or feature will subsequently be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein will be interpreted accordingly.

[0067] 1 to 4 , an embodiment of the present application provides a cold storage system, which includes: an outdoor unit 100 , a refrigerant adjustment device 200 and an energy storage device 300 .

[0068] The outdoor unit 100 includes a liquid-side main pipe 101 , a gas-side main pipe 102 and a low-pressure pipe 103 .

[0069] The refrigerant adjustment device 200 includes a refrigerant storage component 210, a first pipe assembly 220 and a second pipe assembly 230. The inlet of the first pipe assembly 220 is connected to the refrigerant storage component 210, the outlet of the first pipe assembly 220 is connected to the low-pressure pipeline 103, the inlet of the second pipe assembly 230 is connected to the liquid side main pipe 101, and the outlet of the second pipe assembly 230 is connected to the refrigerant storage component 210 and the first pipe assembly 220.

[0070] The energy storage device 300 is installed in parallel between the liquid-side main pipe 101 and the gas-side main pipe 102 .

[0071] In this embodiment, a refrigerant adjustment device 200 is added between the outdoor unit 100 and the energy storage device 300 to enable timely adjustment of the circulating refrigerant volume at each stage of the cold storage system, thereby improving the cold storage efficiency and performance of the cold storage system. Furthermore, the refrigerant adjustment device 200 is positioned on the medium-pressure and low-pressure sides of the outdoor unit 100 and the energy storage device 300 to ensure smooth flow of refrigerant into and out of the refrigerant adjustment device 200, thereby improving the regulation stability and reliability of the refrigerant adjustment device 200.

[0072] Specifically, the cold storage system is configured as a combination component that includes at least an outdoor unit 100, a refrigerant adjustment device 200 and an energy storage device 300. The outdoor unit 100 is used to provide refrigerant circulation power to the cold storage system. The refrigerant adjustment device 200 is used to adjust the amount of circulating refrigerant in the cold storage system so that the refrigerant circulation amount can adapt to the heat exchange capacity of the cold storage system. The energy storage device 300 is used to achieve cold storage.

[0073] Specifically, the outdoor unit 100 is configured as a combination component including at least a liquid side main pipe 101, a gas side main pipe 102 and a low-pressure pipe 103. The liquid side main pipe 101 is used to transport liquid refrigerant with higher pressure, the gas side main pipe 102 is used to transport gaseous refrigerant, and the low-pressure pipe 103 is used to transport liquid refrigerant with lower pressure. The refrigerant adjustment device 200 is configured as a combination component including at least a refrigerant storage part 210, a first pipe assembly 220 and a second pipe assembly 230. The refrigerant storage part 210 can be a refrigerant tank or a refrigerant box for storing liquid refrigerant and gaseous refrigerant; the first pipe assembly 220 is used to transfer the gaseous refrigerant in the refrigerant storage part 210 to the low-pressure pipe 103 of the outdoor unit 100 to maintain the pressure balance in the refrigerant storage part 210; the second pipe assembly 230 is used to transport the liquid refrigerant in the liquid side main pipe 101 to the refrigerant storage part 210, so that the circulating refrigerant in the cold storage system can be effectively stored and the amount of circulating refrigerant in the cold storage system can be reduced. In this way, a pressure difference is formed between the first pipe assembly 220 and the second pipe assembly 230, so that the refrigerant storage part 210 can smoothly complete the liquid inlet and discharge functions, thereby improving the accuracy and reliability of the refrigerant adjustment device 200 in regulating the refrigerant circulation amount in the cold storage system and improving the cold storage efficiency.

[0074] In one possible embodiment, the first pipeline assembly 220 includes a balancing valve 221, a pressure relief valve 222, a first pipeline 223 and a second pipeline 224, the first pipeline 223 connects the refrigerant storage element 210 and the low-pressure pipeline 103, the second pipeline 224 connects the refrigerant storage element 210 and the first pipeline 223, the balancing valve 221 is arranged on the first pipeline 223, and the pressure relief valve 222 is arranged on the second pipeline 224.

[0075] In this embodiment, the specific configuration of the first pipe assembly 220 is optimized. Specifically, the first pipe assembly 220 is configured as a composite component comprising at least a balancing valve 221, a pressure relief valve 222, a first pipe 223, and a second pipe 224. The first pipe 223 can discharge the gaseous refrigerant in the refrigerant storage unit 210 by opening the balancing valve 221, or store the gaseous refrigerant in the refrigerant storage unit 210 by closing the balancing valve 221. The second pipe 224 can discharge excess gaseous refrigerant in the refrigerant storage unit 210 by opening the pressure relief valve 222, or store the gaseous refrigerant in the refrigerant storage unit 210 by closing the pressure relief valve 222. In this way, the gaseous refrigerant in the refrigerant storage component 210 can be discharged in time, alleviating the problem of the continuously rising air pressure in the refrigerant storage component 210 and keeping it in a balanced state, thereby ensuring that the liquid refrigerant can continue to flow into the refrigerant storage component, quickly completing the liquid inlet target, and improving the liquid refrigerant storage performance of the refrigerant storage component and the cold storage efficiency of the cold storage system.

[0076] It should be understood that the pressure relief valve 222 can automatically open when the pressure in the refrigerant storage element 210 is too high, thereby unloading the pressure in the refrigerant storage element 210 and improving the safety of the refrigerant storage element 210 .

[0077] In one possible embodiment, the second pipeline assembly 230 includes a first valve body 231, a second valve body 232, a third pipeline 233 and a fourth pipeline 234, the third pipeline 233 connects the liquid side main pipe 101 and the refrigerant storage component 210, the fourth pipeline 234 connects the third pipeline 233 and the first pipeline 223, the first valve body 231 is arranged in the third pipeline 233, and the second valve body 232 is arranged in the fourth pipeline 234.

[0078] In this embodiment, the specific configuration of the second pipe assembly 230 is optimized. Specifically, the second pipe assembly 230 is configured as a composite component including at least a first valve body 231, a second valve body 232, a third pipe 233, and a fourth pipe 234. The third pipe 233 can supply liquid refrigerant to the refrigerant storage element by opening the first valve body 231, or stop supplying liquid refrigerant to the refrigerant storage element by closing the first valve body 231. The fourth pipe 234 can discharge liquid refrigerant from the refrigerant storage element to the outlet end of the first pipe 223 by opening the second valve body 232, and finally enter the outdoor unit 100 through the low-pressure pipe 103, or stop discharging liquid refrigerant from the refrigerant storage element by closing the second valve body 232. In this way, under the pressure differential of the first pipe assembly 220, the liquid refrigerant can be smoothly delivered to the refrigerant storage element 210 for storage via the third pipe 233, thereby reducing the amount of refrigerant circulating in the cold storage system; or the liquid refrigerant can be smoothly discharged from the refrigerant storage element 210 via the fourth pipe 234, thereby increasing the amount of refrigerant circulating in the cold storage system, ensuring that the refrigerant circulation amount in the cold storage system is at an optimal state throughout the entire cold storage process, thereby improving the cold storage efficiency and performance of the cold storage system. For example, but not limited to, the first valve body 231 is a liquid inlet valve, and the second valve body 232 is a liquid discharge valve.

[0079] In a possible implementation, the first pipe 223 and the second pipe 224 are connected to the top of the refrigerant storage element 210 , and the third pipe 233 is connected to the bottom of the refrigerant storage element 210 .

[0080] In this embodiment, the specific assembly position of the refrigerant adjustment device 200 is optimized. Specifically, the inlet of the first pipe 223 and the second pipe 224 are connected to the top of the refrigerant storage member 210, and the outlet of the third pipe 233 is connected to the bottom of the refrigerant storage member 210 or the side wall near the bottom, so that the gaseous refrigerant is discharged from the top of the refrigerant storage member 210, while the liquid refrigerant enters from the bottom of the refrigerant storage member 210. In this way, the mutual interference between the gaseous refrigerant and the liquid refrigerant can be avoided, the amount of refrigerant in the refrigerant storage member 210 increases rapidly, the amount of refrigerant circulating in the cold storage system is quickly reduced, and the regulation efficiency of the refrigerant circulation amount is improved. At the same time, because the pressure in the refrigerant storage member 210 does not rise rapidly with the large influx of liquid refrigerant, the situation in which the liquid refrigerant cannot enter the refrigerant storage member 210 due to excessive pressure in the refrigerant storage member 210 is avoided, thereby improving the stability of refrigerant storage.

[0081] In one possible implementation, the energy storage device 300 includes an energy storage component 310 , a third pipeline assembly 320 , and a fourth pipeline assembly 330 . The third pipeline assembly 320 connects the liquid side main pipe 101 and the energy storage component 310 , and the fourth pipeline assembly 330 connects the energy storage component 310 and the gas side main pipe 102 .

[0082] In this embodiment, the specific configuration of the energy storage device 300 is optimized. Specifically, the energy storage device 300 is configured as a composite component comprising at least an energy storage element 310, a third pipe assembly 320, and a fourth pipe assembly 330. The energy storage element 310 may be an accumulator for cold storage. The third pipe assembly 320 is used to transfer liquid refrigerant from the liquid-side manifold 101 into the energy storage element 310 to achieve heat exchange and cold storage. The fourth pipe assembly 330 is used to transport gaseous refrigerant from the energy storage element 310 to the gas-side manifold 102 to achieve circulation of the gaseous refrigerant.

[0083] In one example, a capillary tube and a liquid distributor are provided at the top of the energy accumulator 310. The capillary tube is connected to the top of the energy accumulator 310 in an umbrella shape, and the liquid distributor is provided on the side of the capillary tube away from the energy accumulator 310. The third pipe assembly 320 is connected to the upper liquid distributor, and the fourth pipe assembly 330 is connected to the bottom of the energy accumulator 310.

[0084] In one possible embodiment, the third pipeline assembly 320 includes a third valve body 321, a fourth valve body 322, a fifth pipeline 323 and a sixth pipeline 324, the inlet of the fifth pipeline 323 is connected to the liquid side main pipe 101, the outlet of the fifth pipeline 323 is connected to the energy storage component 310, the sixth pipeline 324 connects the fifth pipeline 323 and the fourth pipeline assembly 330, the third valve body 321 is arranged in the fifth pipeline 323, and the fourth valve body 322 is arranged in the sixth pipeline 324.

[0085] In this embodiment, the specific configuration of the third pipe assembly 320 is optimized. Specifically, the third pipe assembly 320 is configured as a composite component comprising at least a third valve body 321, a fourth valve body 322, a fifth pipe 323, and a sixth pipe 324. The fifth pipe 323 can deliver liquid refrigerant to the energy storage element 310 by opening the third valve body 321, or stop delivering liquid refrigerant to the energy storage element 310 by closing the third valve body 321. The sixth pipe 324 can be opened or closed by opening or closing the fourth valve body 322, thereby connecting or disconnecting the fourth pipe assembly 330 and the fifth pipe 323. For example, but not limited to, the third valve body 321 serves as the cold storage expansion valve 130, and the fourth valve body 322 serves as the front cold release valve. This allows the circulating refrigerant to release cold through heat exchange in the energy storage element 310, thereby improving the cold storage capacity of the energy storage element 310.

[0086] In one possible embodiment, the third pipeline assembly 320 also includes a fifth valve body 325, a sixth valve body 326 and a seventh pipeline 327. The inlet of the seventh pipeline 327 is connected to the energy storage component 310, and the outlet of the seventh pipeline 327 is connected to the liquid side main pipe 101 located after the fifth pipeline 323. The fifth valve body 325 is arranged on the seventh pipeline 327, and the sixth valve body 326 is arranged on the liquid side main pipe 101 between the fifth pipeline 323 and the seventh pipeline 327.

[0087] In this embodiment, the specific configuration of the fourth pipeline assembly 330 is optimized. Specifically, the third pipeline assembly 320 is configured as a composite component comprising at least a third valve body 321, a fourth valve body 322, a fifth pipeline 323, a sixth pipeline 324, a fifth valve body 325, a sixth valve body 326, and a seventh pipeline 327. This allows the energy storage component 310 to be connected or disconnected with the liquid-side manifold 101 by opening or closing the fifth valve body 325. Simultaneously, the energy storage component 310 can be connected or disconnected with the liquid-side manifold 101 by opening or closing the sixth valve body 326. For example, but not limited to, the fifth valve body 325 serves as a post-cooling release valve, and the sixth valve body 326 serves as a bypass valve.

[0088] In a possible implementation, the fourth pipeline assembly 330 includes a seventh valve body 331 and an eighth pipeline 332 . The eighth pipeline 332 connects the energy storage component 310 and the gas-side manifold 102 . The seventh valve body 331 is disposed in the eighth pipeline 332 .

[0089] In this embodiment, the specific configuration of the fourth pipe assembly 330 is further optimized. Specifically, the fourth pipe assembly 330 is configured as a composite component comprising at least a seventh valve body 331 and an eighth pipe 332. Thus, opening or closing the seventh valve body 331 can open or close the eighth pipe 332, thereby connecting or disconnecting the energy storage element 310 from the gas-side manifold 102. For example, but not limited to, the seventh valve body 331 can be a thermal storage valve.

[0090] In one possible embodiment, the outdoor unit 100 further includes a compressor 110, a four-way valve 120 and an expansion valve 130, the outlet of the compressor 110 is connected to the D port of the four-way valve 120, the S port of the four-way valve 120 is connected to the inlet of the compressor 110, the C port of the four-way valve 120 is connected to the gas side main pipe 102, the E port of the four-way valve 120 is connected to the expansion valve 130, the outlet of the expansion valve 130 is connected to the liquid side main pipe 101, and the low-pressure pipe 103 is connected to the inlet of the compressor 110.

[0091] In this embodiment, the specific configuration of the outdoor unit 100 is optimized. Specifically, the outdoor unit 100 is configured as a component comprising at least a liquid-side header pipe 101, a gas-side header pipe 102, a low-pressure pipe 103, a compressor 110, a four-way valve 120, and an expansion valve 130. The expansion valve 130 may be a heating electronic expansion valve 130. The high-temperature and high-pressure gas discharged from the compressor 110 enters the four-way valve 120 through the D port of the four-way valve 120, then enters the expansion valve 130 from the E port of the four-way valve 120 to form a high-temperature medium-pressure liquid, and finally enters the liquid side main pipe 101; the low-temperature medium-pressure gas discharged from the outlet of the energy storage device 300 enters the C port of the four-way valve 120 from the medium-pressure pipeline, and then enters the inlet of the compressor 110 from the S port of the four-way valve 120; the gaseous refrigerant and liquid refrigerant discharged from the outlet of the refrigerant adjustment device 200 enter the inlet of the compressor 110 from the low-pressure pipeline 103, thereby completing the refrigerant circulation of the cold storage system.

[0092] In one example, the outdoor unit 100 further includes a heat exchanger 140 and a gas-liquid separator 150 , wherein the heat exchanger 140 is connected between the E port of the four-way valve 120 and the expansion valve 130 through a pipeline, and the gas-liquid separator 150 is connected between the S port of the four-way valve 120 and the compressor 110 through a pipeline. In this way, the high-temperature and high-pressure gas discharged from the compressor 110 enters the four-way valve 120 through the D port of the four-way valve 120, and then flows from the E port of the four-way valve 120 through the heat exchanger 140 into the expansion valve 130 to form a high-temperature medium-pressure liquid, and finally enters the liquid side main pipe 101; the low-temperature medium-pressure gas discharged from the outlet of the energy storage device 300 enters the C port of the four-way valve 120 from the medium-pressure pipeline, and then flows from the S port of the four-way valve 120 through the gas-liquid separator 150 and then enters the compressor 110; the gaseous refrigerant and liquid refrigerant discharged from the outlet of the refrigerant adjustment device 200 flow through the low-pressure pipeline 103 and the gas-liquid separator 150 and then enter the compressor 110, completing the refrigerant circulation.

[0093] Referring to FIG. 5 , in a second aspect, the present application further provides a control method applied to the cold storage system as described above, comprising steps S1 to S4 .

[0094] Step S1: Obtain the operating time of the cold storage system.

[0095] Step S2: If the running time is greater than the preset time, obtain the first temperature of the energy storage material in the energy storage device 300.

[0096] Step S3: If the first temperature is less than or equal to the first preset temperature and greater than the second preset temperature, control the refrigerant adjustment device 200 to enter the first operation mode, wherein the first preset temperature is greater than the second preset temperature.

[0097] Step S4: If the first temperature is less than or equal to the second preset temperature, control the refrigerant adjustment device 200 to enter the second operation mode.

[0098] In this embodiment, the operating stage of the cold storage system is determined based on the system's operating time and the temperature of the energy storage material. The cold storage system is then controlled to execute different operating instructions in different operating stages. Specifically, the operating time of the cold storage system is first obtained to determine whether the cold storage system is in the startup phase. Specifically, if the operating time is greater than a preset time, the cold storage system is determined to be in the non-startup phase, which is the late startup phase. During this phase, the energy storage material in the energy storage device 300 gradually cools down, gradually achieving cold storage. Next, a first temperature of the energy storage material in the energy storage device 300 is obtained to determine whether the energy storage device 300 is in the freezing phase. Specifically, if the first temperature is less than or equal to a first preset temperature and greater than a second preset temperature, the energy storage device 300 is determined to be in the unfrozen phase. At this point, the energy storage material has not yet frozen, and the refrigerant adjustment device 200 is controlled to operate in the first operating mode to enable the cold storage system to rapidly cool down and store cold. If the first temperature is less than or equal to the second preset temperature, it is determined that the energy storage device 300 is in the freezing stage. At this time, the energy storage material gradually solidifies or freezes, and the refrigerant adjustment device 200 needs to be controlled to operate according to the second operating mode to make the refrigerant circulation amount in the cold storage system appropriate and the cold storage efficiency maximized.

[0099] In one example, the preset time is 6-8 minutes, the first preset temperature is greater than the freezing point of the energy storage material, and the second preset temperature is the freezing point of the energy storage material. For example, but not limited to, when the energy storage material is water, the preset time may be 7 minutes, the first preset temperature may be 4°C, and the second preset temperature may be 0°C.

[0100] In a possible implementation, the first operation mode includes executing steps S31 to S33.

[0101] Step S31: Obtain the exhaust gas superheat of the outdoor unit 100, control the balancing valve 221 and the first valve body 231 of the refrigerant adjustment device 200 to open, and the second valve body 232 to close, and continue to inject liquid for a first time period.

[0102] Step S32: Determine whether the cold storage system is over-fluorinated. If so, control the balancing valve 221 and the first valve body 231 of the refrigerant adjustment device 200 to open, the second valve body 232 to close, and continue to inject liquid for a second time period.

[0103] Step S33: determine whether the cold storage system is short of fluorine. If so, control the balancing valve 221 and the first valve body 231 of the refrigerant adjustment device 200 to close, and the second valve body 232 to open, and continue draining for a third time period.

[0104] In this embodiment, in the first operating mode, the operating mode and operating time of the refrigerant adjustment device 200 are determined based on at least three parameters: the exhaust gas superheat of the outdoor unit 100, the excess fluorine in the cold storage system, and the insufficient fluorine in the cold storage system. The exhaust gas superheat is obtained and compared with a preset superheat value. If the exhaust gas superheat is less than the preset superheat value, it indicates that the amount of refrigerant in the refrigerant storage unit 210 is too low and the amount of refrigerant in the refrigerant storage unit 210 needs to be rapidly increased. At this time, the balancing valve 221 and the first valve body 231 of the refrigerant adjustment device 200 are controlled to open, and the second valve body 232 is controlled to close, and the device operates for a first duration. Determine whether the amount of refrigerant circulating in the cold storage system is excessive. If so, it indicates that the cold storage system has experienced an over-fluorine accident. In this case, the balancing valve 221 and the first valve body 231 of the refrigerant adjustment device 200 need to be controlled to open, the second valve body 232 needs to be closed, and the operation needs to be operated for a second duration, so that the circulating refrigerant in the cold storage system quickly enters the refrigerant storage unit 210 for recycling, thereby reducing the amount of circulating refrigerant in the cold storage system. Determine whether the amount of refrigerant circulating in the cold storage system is insufficient. If so, it indicates that the cold storage system has experienced a under-fluorine accident. In this case, the balancing valve 221 and the first valve body 231 of the refrigerant adjustment device 200 need to be controlled to close, the second valve body 232 needs to be opened, and the operation needs to be operated for a third duration, so that the refrigerant in the refrigerant storage unit 210 enters the cold storage system, thereby increasing the amount of circulating refrigerant in the cold storage system.

[0105] In one example, the preset superheat value is 14°C-16°C, the first preset circulation amount can be calculated based on the cold storage system, the first duration is 18s-22s, the second duration is 9s-11s, and the third duration is 9s-11s. For example, but not limited to, the preset superheat value can be 15°C, the first duration can be 20s, the second duration can be 10s, and the third duration can be 10s.

[0106] In one example, when it is detected that the exhaust superheat is greater than or equal to the preset superheat value, it is necessary to wait for 10 minutes and then re-check the exhaust superheat and the preset superheat value. If the exhaust superheat is low again, the above operation needs to be repeated.

[0107] In a possible implementation, determining whether the exhaust gas superheat is less than a preset superheat value includes step S311.

[0108] Step S311: Obtain the exhaust temperature of the compressor 110 and the high-pressure temperature in the compressor 110. If the difference between the exhaust temperature and the high-pressure temperature is greater than a preset difference, it is determined that the exhaust superheat is less than a preset superheat value.

[0109] In this embodiment, the determination of whether the exhaust gas superheat is less than a preset superheat value is based on a comparison of the temperature difference between the exhaust gas temperature of compressor 110 and the high-pressure temperature within compressor 110 with a preset difference. Specifically, when the difference between the exhaust gas temperature and the high-pressure temperature is greater than the preset difference, the exhaust gas superheat is determined to be less than the preset superheat value. In this case, the circulating refrigerant in the cold storage system needs to be transferred to the refrigerant storage element 210 for storage, thereby reducing the amount of circulating refrigerant in the cold storage system and increasing the exhaust gas superheat. For example, but not limited to, the preset difference may be 15°C.

[0110] In a possible implementation, determining whether the cold storage system is over-fluorinated includes steps S321 and S322.

[0111] Step S321: obtaining the high-pressure temperature of the cold storage system as a second temperature, obtaining the superheat of the heat exchanger 140 of the energy storage device 300 as a third temperature, and simultaneously obtaining the minimum exhaust superheat of the cold storage system as a fourth temperature.

[0112] Step S322: If the second temperature is greater than the first preset temperature, the third temperature is less than the second preset temperature, and the fourth temperature is less than the third preset temperature, it is determined that the first refrigerant circulation amount is greater than the first preset circulation amount.

[0113] In this embodiment, whether the cold storage system has an over-fluorination problem is determined based on parameters such as the high-pressure temperature of the cold storage system, the overheat of the heat exchanger of the energy storage device 300, and the minimum exhaust superheat of the cold storage system. Specifically, when the high-pressure temperature of the cold storage system is greater than the first preset temperature, the overheat of the heat exchanger of the energy storage device 300 is less than the second preset temperature, and the minimum exhaust superheat of the cold storage system is less than the third preset temperature, it is determined that the cold storage system has an over-fluorination problem. At this time, it is necessary to control the balancing valve 221 and the first valve body 231 of the refrigerant adjustment device 200 to open, the second valve body 232 to close, and run for a second time, so that the circulating refrigerant in the cold storage system quickly enters the refrigerant storage component 210 for recovery, thereby reducing the amount of circulating refrigerant in the cold storage system.

[0114] In one example, the first preset temperature is 50° C.-60° C., the second preset temperature is 0.5° C.-2° C., and the third preset temperature is 8° C.-12° C. For example, but not limited to, the first preset temperature may be 55° C., the second preset temperature may be 1° C., and the third preset temperature may be 10° C.

[0115] In a possible implementation, determining whether the cold storage system is deficient in fluorine includes steps S331 and S332.

[0116] Step S331: obtaining the superheat of the energy storage device 300 as a fifth temperature, obtaining the opening of the expansion valve 130 of the energy storage device 300 as a first opening, and obtaining the difference between the high pressure temperature of the cold storage system and the ambient temperature as a sixth temperature.

[0117] Step S332: If the fifth temperature is greater than the fourth preset temperature, the first opening is greater than the first preset opening, and the sixth temperature is less than the fifth preset temperature, it is determined that the first refrigerant circulation amount is less than the first preset circulation amount.

[0118] In this embodiment, whether the cold storage system has a fluorine deficiency problem is determined based on parameters such as the superheat of the energy storage device 300, the opening of the expansion valve 130 of the energy storage device 300, and the difference between the high-pressure temperature and the ambient temperature of the cold storage system. Specifically, when the superheat of the energy storage device 300 is greater than the fourth preset temperature, and the opening of the expansion valve 130 of the energy storage device 300 is greater than the first preset opening, and the difference between the high-pressure temperature and the ambient temperature of the cold storage system is less than the fifth preset temperature, it is determined that the cold storage system has a fluorine deficiency problem. At this time, it is necessary to control the balancing valve 221 and the first valve body 231 of the refrigerant adjustment device 200 to be closed, the second valve body 232 to be open, and to operate for a third time period so that the refrigerant in the refrigerant storage component 210 enters the cold storage system, thereby increasing the amount of circulating refrigerant in the cold storage system.

[0119] In one example, the fourth preset temperature is 3° C.-5° C., the first preset opening is 430 steps-470 steps, and the fifth preset temperature is 6° C.-10° C. For example, but not limited to, the fourth preset temperature may be 4° C., the first preset opening may be 450 steps, and the fifth preset temperature may be 8° C.

[0120] In a possible implementation, the second operation mode includes executing steps S41 and S42.

[0121] Step S41 , determining whether the cold storage system is over-fluorinated, and if so, controlling the balancing valve 221 and the first valve body 231 of the refrigerant adjustment device 200 to open, and the second valve body 232 to close, and continuing to inject liquid for a fourth time period.

[0122] Step S42: determine whether the cold storage system is short of fluorine. If so, control the balancing valve 221 and the first valve body 231 of the refrigerant adjustment device 200 to close, and the second valve body 232 to open, and continue draining for a fifth time period.

[0123] In this embodiment, in the second operating mode, the operating mode and operating time of the refrigerant adjustment device 200 are determined based on at least parameters such as the cold storage system's excessive fluorine content and the cold storage system's insufficient fluorine content. Specifically, the refrigerant circulating amount in the cold storage system is determined to be excessive. If so, it indicates that the cold storage system has experienced an excessive fluorine content incident. In this case, the balancing valve 221 and the first valve body 231 of the refrigerant adjustment device 200 are controlled to open, the second valve body 232 is controlled to close, and the operation is performed for a fourth duration, so that the circulating refrigerant in the cold storage system quickly enters the refrigerant storage unit 210 for recycling, thereby reducing the amount of circulating refrigerant in the cold storage system. The refrigerant circulating amount in the cold storage system is determined to be insufficient. If so, it indicates that the cold storage system has experienced an insufficient fluorine content incident. In this case, the balancing valve 221 and the first valve body 231 of the refrigerant adjustment device 200 are controlled to close, the second valve body 232 is controlled to open, and the operation is performed for a fifth duration, so that the refrigerant in the refrigerant storage unit 210 enters the cold storage system, thereby increasing the amount of circulating refrigerant in the cold storage system.

[0124] In one example, the second preset circulation amount can be calculated based on the cold storage system, the fourth time period is 9s-11s, and the fifth time period is 9s-11s. For example, but not limited to, the fourth time period can be 10s, and the fifth time period can be 10s.

[0125] In a possible implementation, determining whether the cold storage system is over-fluorinated includes steps S411 and S412.

[0126] Step S411: obtaining the high-pressure temperature of the cold storage system as the seventh temperature, obtaining the superheat of the heat exchanger 140 of the energy storage device 300 as the eighth temperature, and simultaneously obtaining the minimum exhaust superheat of the cold storage system as the ninth temperature.

[0127] Step S412: If the seventh temperature is greater than the sixth preset temperature, the eighth temperature is less than the seventh preset temperature, and the ninth temperature is less than the eighth preset temperature, it is determined that the second refrigerant circulation amount is greater than the second preset circulation amount.

[0128] In this embodiment, whether the cold storage system has an over-fluorination problem is determined based on parameters such as the high-pressure temperature of the cold storage system, the overheat of the heat exchanger of the energy storage device 300, and the minimum exhaust superheat of the cold storage system. Specifically, when the high-pressure temperature of the cold storage system is greater than the sixth preset temperature, the overheat of the heat exchanger of the energy storage device 300 is less than the seventh preset temperature, and the minimum exhaust superheat of the cold storage system is less than the eighth preset temperature, it is determined that the cold storage system has an over-fluorination problem. At this time, it is necessary to control the balancing valve 221 and the first valve body 231 of the refrigerant adjustment device 200 to open, the second valve body 232 to close, and run for the fourth time, so that the circulating refrigerant in the cold storage system quickly enters the refrigerant storage component 210 for recovery, thereby reducing the amount of circulating refrigerant in the cold storage system.

[0129] In one example, the sixth preset temperature is 50-60° C., the seventh preset temperature is 0.5-2° C., and the eighth preset temperature is 8-12° C. For example, but not limited to, the sixth preset temperature may be 55° C., the seventh preset temperature may be 1° C., and the eighth preset temperature may be 10° C.

[0130] In a possible implementation, determining whether the cold storage system is deficient in fluorine includes steps S421 and S422.

[0131] Step S421: obtaining the superheat degree of the energy storage device 300 as a tenth temperature, obtaining the difference between the high-pressure temperature of the cold storage system and the ambient temperature as an eleventh temperature, and the high-pressure temperature of the cold storage system as a twelfth temperature.

[0132] Step S422: If the tenth temperature is greater than the ninth preset temperature, the eleventh temperature is less than the tenth preset temperature, and the twelfth temperature is less than the eleventh preset temperature, it is determined that the first refrigerant circulation amount is less than the first preset circulation amount.

[0133] In this embodiment, whether the cold storage system has a fluorine deficiency problem is determined based on parameters such as the superheat of the energy storage device 300, the difference between the high-pressure temperature of the cold storage system and the ambient temperature, and the high-pressure temperature of the cold storage system. Specifically, when the superheat of the energy storage device 300 is greater than the ninth preset temperature, and the difference between the high-pressure temperature of the cold storage system and the ambient temperature is less than the tenth preset temperature, and the high-pressure temperature of the cold storage system is less than the eleventh preset temperature, it is determined that the cold storage system has a fluorine deficiency problem. At this time, it is necessary to control the balancing valve 221 and the first valve body 231 of the refrigerant adjustment device 200 to close, the second valve body 232 to open, and run for the fifth time, so that the refrigerant in the refrigerant storage component 210 enters the cold storage system, thereby increasing the amount of circulating refrigerant in the cold storage system.

[0134] In one example, the ninth preset temperature is 3° C.-5° C., the tenth preset temperature is 6° C.-10° C., and the eleventh preset temperature is 36° C.-44° C. For example, but not limited to, the ninth preset temperature may be 4° C., the tenth preset temperature may be 8° C., and the eleventh preset temperature may be 40° C.

[0135] In a possible implementation, determining whether the cold storage system is deficient in fluorine further includes steps S423 to S425.

[0136] Step S423: Acquire the opening degree of the expansion valve 130 of the energy storage device 300 as a second opening degree.

[0137] Step S424: If the second opening is greater than the second preset opening, the balancing valve 221 and the first valve body 231 of the refrigerant adjustment device 200 are controlled to be closed, and the second valve body 232 is controlled to be open, and the drainage is continued for a sixth period of time.

[0138] Step S425: If the second opening is smaller than the third preset opening, the air pressure valve and the first valve body 231 of the refrigerant adjustment device 200 are controlled to open, the balancing valve 221 and the second valve body 232 are controlled to close, and the liquid is continuously introduced for the seventh period; wherein the third preset opening is smaller than the second preset opening.

[0139] In this embodiment, whether the cold storage system is experiencing a fluorine deficiency is determined based on parameters such as the superheat of the energy storage device 300, the difference between the high-pressure temperature of the cold storage system and the ambient temperature, the high-pressure temperature of the cold storage system, and the opening of the expansion valve 130 of the energy storage device 300. Specifically, when the opening of the expansion valve 130 of the energy storage device 300 is greater than a second predetermined opening, the cold storage system is determined to be experiencing a fluorine deficiency. At this point, the balancing valve 221 and the first valve body 231 of the refrigerant adjustment device 200 are controlled to close, and the second valve body 232 is controlled to open for a sixth duration, so that the refrigerant in the refrigerant storage element 210 enters the cold storage system, thereby increasing the amount of circulating refrigerant in the cold storage system. When the opening of the expansion valve 130 of the energy storage device 300 is less than the third preset opening, it is judged that the amount of circulating refrigerant in the cold storage system is large. At this time, it is necessary to control the air pressure valve and the first valve body 231 of the refrigerant adjustment device 200 to open, the balancing valve 221 and the second valve body 232 to close, and run for the seventh time, so that the circulating refrigerant in the cold storage system gradually enters the refrigerant storage component 210 for recovery, thereby gradually reducing the amount of circulating refrigerant in the cold storage system.

[0140] In one example, the second preset opening is 240-260 steps, the third preset opening is 80-90 steps, the sixth time duration is 9s-11s, and the seventh time duration is 4s-6s. For example, but not limited to, the second preset opening can be 250 steps, the third preset opening can be 85 steps, the sixth time duration can be 10s, and the seventh time duration can be 5s.

[0141] In a possible implementation, the control method of the cold storage system of the present application further includes step S5.

[0142] Step S5: If the operating time is less than or equal to the preset time, the refrigerant adjustment device 200 is controlled to enter the third operation mode.

[0143] In this embodiment, specifically, the operating time of the cold storage system is first obtained to determine whether the cold storage system is in the startup stage. Specifically, if the operating time is less than or equal to the preset time, it is determined that the cold storage system is in the startup stage, and the energy storage device 300 needs to be adjusted for the initial refrigerant quantity. At this time, the refrigerant adjustment device 200 is controlled to perform operations according to the third operating mode.

[0144] In a possible implementation, the third operation mode includes executing steps S51 and S52.

[0145] Step S51 , controlling the balancing valve 221 and the first valve body 231 of the refrigerant adjustment device 200 to be closed, and the second valve body 232 to be open, and continuing the discharge for an eighth period of time.

[0146] Step S52 , controlling the balancing valve 221 and the first valve body 231 of the refrigerant adjustment device 200 to open, and the second valve body 232 to close, and continuing to inject liquid for a ninth period of time.

[0147] In this embodiment, the third operation mode is divided into two stages, a front and a back stage. In the front stage, the balancing valve 221 and the first valve body 231 of the refrigerant adjustment device 200 need to be closed, the second valve body 232 needs to be opened, and the operation is continued for the eighth time to completely drain the refrigerant in the refrigerant storage part 210, so as to avoid the occurrence of inaccurate total amount of refrigerant in the refrigerant storage part 210 due to unknown amount of residual refrigerant; in the back stage, the balancing valve 221 and the first valve body 231 of the refrigerant adjustment device 200 need to be controlled to be opened, the second valve body 232 needs to be closed, and the operation is continued for the ninth time to quickly replenish the amount of refrigerant in the refrigerant storage part 210.

[0148] In one example, the eighth duration is 1.5 minutes to 3 minutes, and the ninth duration is 4.5 minutes to 6 minutes. For example, but not limited to, the eighth duration may be 2 minutes, and the ninth duration may be 5 minutes.

[0149] Thirdly, embodiments of the present application further provide a storage medium storing a computer program configured to execute the aforementioned control method for a cold storage system when executed. The control logic of the control method for the cold storage system is similar to that of the aforementioned embodiments. Since this storage medium utilizes all the technical solutions of all of the aforementioned embodiments, it at least possesses all the beneficial effects of the technical solutions of the aforementioned embodiments, and therefore will not be further elaborated upon here.

[0150] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0151] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0152] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A cold storage system, characterized in that, Comprising: An outdoor unit, including a liquid-side main pipe, a gas-side main pipe, and a low-pressure pipe; A refrigerant adjustment device, including a refrigerant storage member, a first pipe assembly, and a second pipe assembly. The inlet of the first pipe assembly communicates with the refrigerant storage member, the outlet of the first pipe assembly communicates with the low-pressure pipe, the inlet of the second pipe assembly communicates with the liquid-side main pipe, and the outlet of the second pipe assembly communicates with the refrigerant storage member and the first pipe assembly; And An energy storage device, which is connected in parallel between the liquid-side main pipe and the gas-side main pipe.

2. The cold storage system according to claim 1, wherein The first pipe assembly includes a balance valve, a pressure relief valve, a first pipe, and a second pipe; the first pipe communicates with the refrigerant storage member and the low-pressure pipe, the second pipe communicates with the refrigerant storage member and the first pipe; the balance valve is arranged on the first pipe, and the pressure relief valve is arranged on the second pipe.

3. The cold storage system according to claim 2, wherein, The second pipe assembly includes a first valve body, a second valve body, a third pipe, and a fourth pipe; the third pipe communicates with the liquid-side main pipe and the refrigerant storage member; the fourth pipe communicates with the third pipe and the first pipe; the first valve body is arranged on the third pipe, and the second valve body is arranged on the fourth pipe.

4. The cold storage system according to claim 3, characterized in that, The first pipe and the second pipe communicate with the top of the refrigerant storage member, and the third pipe communicates with the bottom of the refrigerant storage member.

5. The cold storage system according to any one of claims 1-4, characterized in that, The energy storage device includes an energy storage member, a third pipe assembly, and a fourth pipe assembly; the third pipe assembly communicates with the liquid-side main pipe and the energy storage member, and the fourth pipe assembly communicates with the energy storage member and the gas-side main pipe.

6. The cold storage system according to claim 5, characterized in that, The third pipe assembly includes a third valve body, a fourth valve body, a fifth pipe, and a sixth pipe; the inlet of the fifth pipe communicates with the liquid-side main pipe, and the outlet of the fifth pipe communicates with the energy storage member; the sixth pipe communicates with the fifth pipe and the fourth pipe assembly; the third valve body is arranged on the fifth pipe; the fourth valve body is arranged on the sixth pipe.

7. The cold storage system according to claim 6, characterized in that, The third pipe assembly further includes a fifth valve body, a sixth valve body, and a seventh pipe; the inlet of the seventh pipe communicates with the energy storage member, and the outlet of the seventh pipe communicates with the liquid-side main pipe behind the fifth pipe; the fifth valve body is arranged on the seventh pipe; the sixth valve body is arranged on the liquid-side main pipe between the fifth pipe and the seventh pipe.

8. The cold storage system according to claim 6 or 7, characterized in that, The fourth pipe assembly includes a seventh valve body and an eighth pipe; the eighth pipe communicates with the energy storage member and the gas-side main pipe; the seventh valve body is arranged on the eighth pipe.

9. The cold storage system according to any one of claims 1-8, characterized in that, The outdoor unit further includes a compressor, a four-way valve, and an expansion valve; the outlet of the compressor communicates with the D port of the four-way valve; the S port of the four-way valve communicates with the inlet of the compressor, the C port of the four-way valve communicates with the gas-side main pipe, the E port of the four-way valve communicates with the expansion valve; the outlet of the expansion valve communicates with the liquid-side main pipe, and the low-pressure pipe communicates with the inlet of the compressor.

10. A control method applied to the cold storage system according to any one of claims 1 to 9, characterized in that, Comprising: Obtaining the running time of the cold storage system; If the running time is greater than a preset time, then obtaining the first temperature of the energy storage material in the energy storage device; If the first temperature is less than or equal to the first preset temperature and greater than the second preset temperature, control the refrigerant adjustment device to enter the first operation mode, where the first preset temperature is greater than the second preset temperature; If the first temperature is less than or equal to the second preset temperature, control the refrigerant adjustment device to enter the second operation mode.

11. The control method according to claim 10, characterized in that, The first operation mode includes: Obtain the exhaust superheat degree of the outdoor unit. If the exhaust superheat degree is less than the preset superheat degree value, control the balance valve and the first valve body of the refrigerant adjustment device to open, and the second valve body to close, and continuously feed liquid for the first time period; Judge whether the cold storage system is over-fluorinated. If so, control the balance valve and the first valve body of the refrigerant adjustment device to open, and the second valve body to close, and continuously feed liquid for the second time period; Judge whether the cold storage system is under-fluorinated. If so, control the balance valve and the first valve body of the refrigerant adjustment device to close, and the second valve body to open, and continuously drain liquid for the third time period.

12. The control method according to claim 11, characterized in that, Judging that the exhaust superheat degree is less than the preset superheat degree value includes: Obtain the exhaust temperature of the compressor and the high-pressure temperature inside the compressor. If the difference between the exhaust temperature and the high-pressure temperature is greater than the preset difference, judge that the exhaust superheat degree is less than the preset superheat degree value.

13. The control method according to claim 11 or 12, characterized in that, The judgment of whether the cold storage system is over-fluorinated includes: Obtain the high-pressure temperature of the cold storage system as the second temperature, obtain the superheat degree of the heat exchanger of the energy storage device as the third temperature, and simultaneously obtain the lowest exhaust superheat degree of the cold storage system as the fourth temperature; If the second temperature is greater than the first preset temperature, the third temperature is less than the second preset temperature, and the fourth temperature is less than the third preset temperature, judge that the first refrigerant circulation amount is greater than the first preset circulation amount.

14. The control method according to any one of claims 11-13, characterized in that, The judgment of whether the cold storage system is under-fluorinated includes: Obtain the superheat degree of the energy storage device as the fifth temperature, obtain the opening degree of the expansion valve of the energy storage device as the first opening degree, and simultaneously obtain the difference between the high-pressure temperature of the cold storage system and the ambient temperature as the sixth temperature; If the fifth temperature is greater than the fourth preset temperature, the first opening degree is greater than the first preset opening degree, and the sixth temperature is less than the fifth preset temperature, judge that the first refrigerant circulation amount is less than the first preset circulation amount.

15. The control method according to any one of claims 10-14, characterized in that, The second operation mode includes: Judge whether the cold storage system is over-fluorinated. If so, control the balance valve and the first valve body of the refrigerant adjustment device to open, and the second valve body to close, and continuously feed liquid for the fourth time period; Judge whether the cold storage system is under-fluorinated. If so, control the balance valve and the first valve body of the refrigerant adjustment device to close, and the second valve body to open, and continuously drain liquid for the fifth time period.

16. The control method according to claim 15, wherein The judgment of whether the cold storage system is over-fluorinated includes: Obtain the high-pressure temperature of the cold storage system as the seventh temperature, obtain the superheat degree of the heat exchanger of the energy storage device as the eighth temperature, and simultaneously obtain the lowest exhaust superheat degree of the cold storage system as the ninth temperature; If the seventh temperature is greater than the sixth preset temperature, the eighth temperature is less than the seventh preset temperature, and the ninth temperature is less than the eighth preset temperature, judge that the second refrigerant circulation amount is greater than the second preset circulation amount.

17. The control method according to claim 15 or 16, characterized in that The judgment of whether the cold storage system is under-fluorinated includes: Obtain the superheat degree of the energy storage device as the tenth temperature, obtain the difference between the high-pressure temperature and the ambient temperature of the cold storage system as the eleventh temperature, and at the same time, the high-pressure temperature of the cold storage system is the twelfth temperature; If the tenth temperature is greater than the ninth preset temperature, and the eleventh temperature is less than the tenth preset temperature, and the twelfth temperature is less than the eleventh preset temperature, it is determined that the first refrigerant circulation amount is less than the first preset circulation amount.

18. The control method according to claim 17, wherein, The determination of whether the cold storage system lacks refrigerant further includes: Obtain the expansion valve opening of the energy storage device as the second opening; If the second opening is greater than the second preset opening, control the balance valve and the first valve body of the refrigerant adjustment device to close, and the second valve body to open, and continuously drain liquid for the sixth duration; If the second opening is less than the third preset opening, control the pressure valve and the first valve body of the refrigerant adjustment device to open, and the balance valve and the second valve body to close, and continuously feed liquid for the seventh duration; where the third preset opening is less than the second preset opening.

19. The control method according to any one of claims 10-18, characterized in that, It further includes: If the running time is less than or equal to the preset time, control the refrigerant adjustment device to enter the third operation mode.

20. The control method according to claim 19, characterized in that, The third operation mode includes: Control the balance valve and the first valve body of the refrigerant adjustment device to close, and the second valve body to open, and continuously drain liquid for the eighth duration; Control the balance valve and the first valve body of the refrigerant adjustment device to open, and the second valve body to close, and continuously feed liquid for the ninth duration.

21. A storage medium, characterized in that, The computer program is stored in the storage medium, and the computer program is set to execute the control method of the cold storage system according to any one of claims 10-20 when running.

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