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

RELATED APPLICATION

[0001] The present application claims the priority of Chinese patent application 202311873529.X, filed on December 29, 2023, and entitled "COOL STORAGE SYSTEM, CONTROL METHOD FOR COOL STORAGE SYSTEM, AND STORAGE MEDIUM", the entire content of which is incorporated herein by reference.TECHNICAL FIELD

[0002] The present application relates to the field of cool storage technology, and in particular to a cool storage system, a control method for a cool storage system, and a storage medium.BACKGROUND

[0003] Multi-split air conditioners typically include one or more outdoor units connected to multiple indoor units, and are widely used in densely populated areas such as shopping malls and office buildings. During operation, a multi-split cool storage system often experiences inappropriate refrigerant circulation amount, which can negatively impact the lifespan, operational status, and performance of the system.

[0004] In related technology, a multi-split cool storage system often determines whether the amount of refrigerant in the cool storage system is appropriate based on a single parameter. However, the determination method has low accuracy, and suffers from problems such as untimely adjustment of the refrigerant circulation amount and low cool storage efficiency in the multi-split cool storage system.SUMMARY

[0005] The present application provides a cool storage system, a control method for a cool storage system, and a storage medium to solve the technical problems of untimely adjustment of refrigerant circulation amount and low cool storage efficiency in traditional cool storage systems.

[0006] Therefore, in a first aspect, embodiments of the present application provide a cool storage system, including: an outdoor unit, including a liquid-side main pipe, a gas-side main pipe, and a low-pressure pipeline; a refrigerant adjusting device, including a refrigerant storage component, a first piping assembly, and a second piping assembly; an inlet of the first piping assembly being connected to the refrigerant storage component, and an outlet of the first piping assembly being connected to the low-pressure pipeline; an inlet of the second piping assembly being connected to the liquid-side main pipe, and an outlet of the second piping assembly being connected to the refrigerant storage component and the first piping assembly; and an accumulator assembly connected in parallel between the liquid-side main pipe and the gas-side main pipe.

[0007] In an optional embodiment, the first piping assembly includes a balancing valve, a pressure relief valve, a first pipe, and a second pipe. The first pipe connects the refrigerant storage component and the low-pressure pipeline. The second pipe connects the refrigerant storage component and the first pipe. The balancing valve is disposed in the first pipe; and the pressure relief valve is disposed in the second pipe.

[0008] In an optional embodiment, the second piping assembly includes a first valve, a second valve, a third pipe, and a fourth pipe. The third pipe connects the liquid-side main pipe and the refrigerant storage component. The fourth pipe connects the third pipe and the first pipe. The first valve is disposed in the third pipe. The second valve is disposed in the fourth pipe.

[0009] In an optional embodiment, the first pipe and the second pipe are connected to a top of the refrigerant storage component, and the third pipe is connected to a bottom of the refrigerant storage component.

[0010] In an optional embodiment, the accumulator assembly includes an accumulator, a third piping assembly, and a fourth piping assembly; the third piping assembly connects the liquid-side main pipe and the accumulator. The fourth piping assembly connects the accumulator and the gas-side main pipe.

[0011] In an optional embodiment, the third piping assembly includes a third valve, a fourth valve, a fifth pipe, and a sixth pipe. An inlet of the fifth pipe is connected to the liquid-side main pipe, and an outlet of the fifth pipe is connected to the accumulator. The sixth pipe connects the fifth pipe and the fourth piping assembly. The third valve is disposed in the fifth pipe; and the fourth valve is disposed in the sixth pipe.

[0012] In an optional embodiment, the third piping assembly further includes a fifth valve, a sixth valve, and a seventh pipe. An inlet of the seventh pipe is connected to the accumulator, and an outlet of the seventh pipe is connected to the liquid-side main pipe downstream of the fifth pipe. The fifth valve is disposed in the seventh pipe, and the sixth valve is disposed in the liquid-side main pipe located between the fifth pipe and the seventh pipe.

[0013] In an optional embodiment, the fourth piping assembly includes a seventh valve and an eighth pipe. The eighth pipe connects the accumulator and the gas-side main pipe. The seventh valve is disposed in the eighth pipe.

[0014] In an optional embodiment, the outdoor unit further includes a compressor, a four-way valve, and an expansion valve. An outlet of the compressor is connected to a D-port of the four-way valve, an S-port of the four-way valve is connected to an inlet of the compressor, a C-port of the four-way valve is connected to the gas-side main pipe, and an E-port of the four-way valve is connected to the expansion valve. An 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.

[0015] In a second aspect, the present application further provides a control method for the cool storage system, including: obtaining an operating time of the cool storage system; obtaining a first temperature of energy storage material in the accumulator assembly when the operating time is greater than a preset time; controlling the refrigerant adjusting device to enter a first operating mode when the first temperature is less than or equal to a first preset temperature, and greater than a second preset temperature, wherein the first preset temperature is greater than the second preset temperature; and controlling the refrigerant adjusting device to enter a second operating mode when the first temperature is less than or equal to the second preset temperature.

[0016] In an optional embodiment, the first operating mode includes: obtaining a discharge superheat of the outdoor unit; and when the discharge superheat is less than the preset superheat value, controlling a balancing valve and a first valve of the refrigerant adjusting device to open, controlling a second valve to close, and maintaining liquid intake for a first duration; determining whether the cool storage system is overcharged with refrigerant; and if so, controlling the balancing valve and the first valve of the refrigerant adjusting device to open, controlling the second valve to close, and maintaining liquid intake for a second duration; and determining whether the cool storage system is undercharged with refrigerant; and if so, controlling the balancing valve and the first valve of the refrigerant adjusting device to close, controlling the second valve to open, and maintaining liquid discharge for a third duration.

[0017] In an optional embodiment, determining that the discharge superheat is less than the preset superheat value includes: obtaining a discharge temperature of a compressor and a high-pressure temperature inside the compressor; and determining that the discharge superheat is less than the preset superheat value, when a difference between the discharge temperature and the high-pressure temperature is greater than a preset difference.

[0018] In an optional embodiment, determining whether the cool storage system is overcharged with refrigerant includes: obtaining a high-pressure temperature of the cool storage system as a second temperature, obtaining a superheat of a heat exchanger in the accumulator assembly as a third temperature, and simultaneously obtaining a minimum discharge superheat of the cool storage system as a fourth temperature; and determining that a first refrigerant circulation amount is greater than a first preset circulation amount, when the second temperature is greater than the first preset temperature, and the third temperature is less than the second preset temperature, and the fourth temperature is less than a third preset temperature.

[0019] In an optional embodiment, determining whether the cool storage system is undercharged with refrigerant includes: obtaining a superheat of the accumulator assembly as a fifth temperature, obtaining an opening degree of an expansion valve of the accumulator assembly as a first opening degree, and simultaneously obtaining a difference between a high-pressure temperature of the cool storage system and an ambient temperature as a sixth temperature; and determining that a first refrigerant circulation amount is less than a first preset circulation amount when the fifth temperature is greater than a fourth preset temperature, and the first opening degree is greater than a first preset opening degree, and the sixth temperature is less than a fifth preset temperature.

[0020] In an optional embodiment, the second operating mode includes: determining whether the cool storage system is overcharged with refrigerant; and if so, controlling a balancing valve and a first valve of the refrigerant adjusting device to open, and controlling a second valve to close, and maintaining liquid intake for a fourth duration; and determining whether the cool storage system is undercharged with refrigerant; and if so, controlling the balancing valve and the first valve of the refrigerant adjusting device to close, and controlling the second valve to open, and maintaining liquid discharge for a fifth duration.

[0021] In an optional embodiment, determining whether the cool storage system is overcharged with refrigerant includes: obtaining a high-pressure temperature of the cool storage system as a seventh temperature, obtaining a superheat of a heat exchanger of the accumulator assembly as an eighth temperature, and simultaneously obtaining a minimum discharge superheat of the cool storage system as a ninth temperature; and determining that a second refrigerant circulation amount is greater than a second preset circulation amount , when the seventh temperature is greater than a sixth preset temperature, and the eighth temperature is less than a seventh preset temperature, and the ninth temperature is less than an eighth preset temperature.

[0022] In an optional embodiment, determining whether the cool storage system is undercharged with refrigerant includes: obtaining a superheat of the accumulator assembly as a tenth temperature, obtaining a difference between a high-pressure temperature of the cool storage system and an ambient temperature as an eleventh temperature, and simultaneously obtaining the high-pressure temperature of the cool storage system as a twelfth temperature; and determining that a first refrigerant circulation amount is less than a first preset circulation amount , when the tenth temperature is greater than a ninth preset temperature, and the eleventh temperature is less than a tenth preset temperature, and the twelfth temperature is less than an eleventh preset temperature.

[0023] In an optional embodiment, determining whether the cool storage system is undercharged with refrigerant further includes: obtaining an opening degree of an expansion valve of the accumulator assembly as a second opening degree; when the second opening degree is greater than a second preset opening degree, controlling the balancing valve and the first valve of the refrigerant adjusting device to close, and controlling the second valve to open, and maintaining liquid discharge for a sixth duration; and when the second opening degree is less than a third preset opening degree, controlling a pressure relief valve and the first valve of the refrigerant adjusting device to open, controlling the balancing valve and the second valve to close, and maintaining liquid intake for a seventh duration; wherein the third preset opening degree is less than the second preset opening degree.

[0024] In an optional embodiment, the control method further includes: controlling the refrigerant adjusting device to enter a third operating mode when the operating time is less than or equal to the preset time.

[0025] In an optional embodiment, the third operating mode includes: controlling a balancing valve and a first valve of the refrigerant adjusting device to close, controlling the second valve to open, and maintaining liquid discharge for an eighth duration; and controlling the balancing valve and the first valve of the refrigerant adjusting device to open, controlling the second valve to close, and maintaining liquid intake for a ninth duration.

[0026] In a third aspect, embodiments of the present application provide a storage medium. A computer program is stored in the storage medium, and the computer program is configured to, when executed, perform any one of the control method for the cool storage system above.

[0027] In the cool storage system, the control method for the cool storage system, and the storage medium provided by the embodiments of the present application, the cool storage system includes: an outdoor unit, including a liquid-side main pipe, a gas-side main pipe, and a low-pressure pipeline; a refrigerant adjusting device, including a refrigerant storage component, a first piping assembly, and a second piping assembly; an inlet of the first piping assembly being connected to the refrigerant storage component, and an outlet of the first piping assembly being connected to the low-pressure pipeline; an inlet of the second piping assembly being connected to the liquid-side main pipe, and an outlet of the second piping assembly being connected to the refrigerant storage component and the first piping assembly; and an accumulator assembly connected in parallel between the liquid-side main pipe and the gas-side main pipe. In the technical solution of the present application, by arranging the refrigerant adjusting device between the outdoor unit and the accumulator assembly, the refrigerant circulation amount in each stage of the cool storage system can be adjusted timely, thereby improving the cool storage efficiency and performance of the cool storage system. Furthermore, the refrigerant adjusting device is disposed at an intermediate-pressure side and a low-pressure side of the outdoor unit and the accumulator assembly, allowing the refrigerant in the refrigerant adjusting device to flow in and out smoothly, thus improving the adjustment stability and reliability of the refrigerant adjusting device.BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and forming part of this specification, illustrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application. To more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative efforts. One or more embodiments are described based on the corresponding figures in the accompanying drawings. These exemplary descriptions do not constitute a limitation on the embodiments. Elements with the same reference numeral in the drawings represent similar elements. Unless otherwise stated, the figures in the drawings do not constitute a limitation of scale. FIG. 1 is a schematic view showing a cool storage system according to embodiments of the present application; FIG. 2 is a schematic view showing a first liquid intake mode of a refrigerant adjusting device of the cool storage system according to embodiments of the present application, where arrows indicate a flow direction of a refrigerant circulation loop; FIG. 3 is a schematic view showing a second liquid intake mode of the refrigerant adjusting device of the cool storage system according to embodiments of the present application, where arrows indicate a flow direction of a refrigerant circulation loop; FIG. 4 is a schematic view showing a liquid discharge mode of the refrigerant adjusting device of the cool storage system according to embodiments of the present application, where arrows indicate a flow direction of a refrigerant circulation loop; and FIG. 5 is a flowchart showing a control method for the cool storage system according to an embodiment of the present application. Explanation of reference numerals:

[0029] 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 adjusting device; 210. refrigerant storage component; 220. first piping assembly; 221. balancing valve; 222. pressure relief valve; 223. first pipe; 224. second pipe; 230. second piping assembly; 231. first valve; 232. second valve; 233. third pipe; 234. fourth pipe; 300. accumulator assembly; 310. accumulator; 320. third piping assembly; 321. third valve; 322. fourth valve; 323. fifth pipe; 324. sixth pipe; 325. fifth valve; 326. sixth valve; 327. seventh pipe; 330. fourth piping assembly; 331. seventh valve; 332, eighth pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, but not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present application.

[0031] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present application. To simplify the present disclosure, specific examples of components and arrangements are described below. These are merely embodiments and are not intended to limit the scope of the present application. Furthermore, reference numerals and / or letters may be repeated in different embodiments. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in the present application, however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0032] For ease of description, spatial 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. These relative terms are, for example, "internal", "external", "inside", "outside", "below", "beneath", "above", "over", "front", "rear", and the like. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over or undergoes a change in posture or motion state, these directional indications would change accordingly. For instance, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the exemplary term "below" can encompass an orientation of both above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein are interpreted accordingly.

[0033] Referring to FIGS. 1 to 4, an embodiment of the present application provides a cool storage system, including: an outdoor unit 100, a refrigerant adjusting device 200, and an accumulator assembly 300.

[0034] The outdoor unit 100 includes a liquid-side main pipe 101, a gas-side main pipe 102 and a low-pressure pipeline 103.

[0035] The refrigerant adjusting device 200 includes a refrigerant storage component 210, a first piping assembly 220, and a second piping assembly 230. The inlet of the first piping assembly 220 is connected to the refrigerant storage component 210, and the outlet of the first piping assembly 220 is connected to the low-pressure pipeline 103. The inlet of the second piping assembly 230 is connected to the liquid-side main pipe 101, and the outlet of the second piping assembly 230 is connected to both the refrigerant storage component 210 and the first piping assembly 220.

[0036] The accumulator assembly 300 is connected in parallel between the liquid-side main pipe 101 and the gas-side main pipe 102.

[0037] In the embodiment, by arranging the refrigerant adjusting device 200 between the outdoor unit 100 and the accumulator assembly 300, the refrigerant circulation amount in each stage of the cool storage system can be adjusted timely, thereby improving the cool storage efficiency and performance of the cool storage system. Furthermore, the refrigerant adjusting device 200 is disposed at an intermediate-pressure side and a low-pressure side of the outdoor unit 100 and the accumulator assembly 300, allowing the refrigerant in the refrigerant adjusting device 200 to flow in and out smoothly, thus improving the adjustment stability and reliability of the refrigerant adjusting device 200.

[0038] Specifically, the cool storage system is configured as a combined assembly including at least the outdoor unit 100, the refrigerant adjusting device 200, and the accumulator assembly 300. The outdoor unit 100 is configured to provide refrigerant circulation power for the cool storage system. The refrigerant adjusting device 200 is configured to adjust the refrigerant circulation amount in the cool storage system, so that the refrigerant circulation amount can match the heat exchange capacity of the cool storage system. The accumulator assembly 300 is configured to realize cool storage.

[0039] Specifically, the outdoor unit 100 is configured as a combined assembly including at least the liquid-side main pipe 101, the gas-side main pipe 102, and the low-pressure pipeline 103. The liquid-side main pipe 101 is configured to transport liquid refrigerant with relatively high pressure, the gas-side main pipe 102 is configured to transport gaseous refrigerant, and the low-pressure pipeline 103 is configured to transport liquid refrigerant with relatively low pressure. The refrigerant adjusting device 200 is configured as a combined assembly including at least the refrigerant storage component 210, the first piping assembly 220, and the second piping assembly 230. The refrigerant storage component 210 can be a refrigerant tank or refrigerant container for storing liquid and gaseous refrigerant. The first piping assembly 220 is configured to transport the gaseous refrigerant from the refrigerant storage component 210 to the low-pressure pipeline 103 of the outdoor unit 100 to maintain pressure balance in the refrigerant storage component 210. The second piping assembly 230 is configured to transport the liquid refrigerant from the liquid-side main pipe 101 to the refrigerant storage component 210, so that the circulating refrigerant in the cool storage system can be effectively stored, reducing the refrigerant circulation amount in the cool storage system. Thus, a pressure difference is formed between the first piping assembly 220 and the second piping assembly 230 to allow the refrigerant storage component 210 to smoothly perform liquid intake and discharge functions, thereby improving the adjustment precision and reliability of the refrigerant adjusting device 200 for the refrigerant circulation amount in the cool storage system, and improving the cool storage efficiency.

[0040] In an optional embodiment, the first piping assembly 220 includes a balancing valve 221, a pressure relief valve 222, a first pipe 223, and a second pipe 224. The first pipe 223 connects the refrigerant storage component 210 and the low-pressure pipeline 103, and the second pipe 224 connects the refrigerant storage component 210 and the first pipe 223. The balancing valve 221 is disposed in the first pipe 223, and the pressure relief valve 222 is disposed in the second pipe 224.

[0041] In this embodiment, the specific configuration of the first piping assembly 220 is optimized. Specifically, the first piping assembly 220 is configured as a combined assembly including at least the balancing valve 221, the pressure relief valve 222, the first pipe 223, and the second pipe 224. The first pipe 223 is configured to discharge gaseous refrigerant from the refrigerant storage component 210 by opening the balancing valve 221, or store gaseous refrigerant in the refrigerant storage component 210 by closing the balancing valve 221. The second pipe 224 is configured to discharge excess gaseous refrigerant from the refrigerant storage component 210 by opening the pressure relief valve 222, or store gaseous refrigerant in the refrigerant storage component 210 by closing the pressure relief valve 222. In this way, the gaseous refrigerant in the refrigerant storage component 210 can be discharged timely to alleviate the problem of continuously rising pressure within the refrigerant storage component 210 and maintain the pressure in an equilibrium state, thereby ensuring that the liquid refrigerant can continuously flow into the refrigerant storage component to quickly achieve a liquid intake target, and improving the liquid refrigerant storage performance of the refrigerant storage component and the cool storage efficiency of the cool storage system.

[0042] It should be understood that the pressure relief valve 222 can automatically open when the pressure in the refrigerant storage component 210 is too high, thereby achieving pressure relief of the refrigerant storage component 210 and improving the safety of the refrigerant storage component 210.

[0043] In an optional embodiment, the second piping assembly 230 includes a first valve 231, a second valve 232, a third pipe 233, and a fourth pipe 234. The third pipe 233 connects the liquid-side main pipe 101 and the refrigerant storage component 210, and the fourth pipe 234 connects the third pipe 233 and the first pipe 223. The first valve 231 is disposed in the third pipe 233, and the second valve 232 is disposed in the fourth pipe 234.

[0044] In this embodiment, the specific configuration of the second piping assembly 230 is optimized. Specifically, the second piping assembly 230 is configured as a combined assembly including at least the first valve 231, the second valve 232, the third pipe 233, and the fourth pipe 234. The third pipe 233 can transport liquid refrigerant to the refrigerant storage component by opening the first valve 231, or stop transporting liquid refrigerant to the refrigerant storage component by closing the first valve 231. The fourth pipe 234 is configured to discharge the liquid refrigerant from the refrigerant storage component to an outlet end of the first pipe 223 by opening the second valve 232, so that the liquid refrigerant flows through the low-pressure pipeline 103 and finally enters the outdoor unit 100, or to stop the discharge of the liquid refrigerant from the refrigerant storage component by closing the second valve 232. Thus, under the pressure differential of the first piping assembly 220, liquid refrigerant can be smoothly transported to the refrigerant storage component 210 for storage through the third pipe 233, thereby reducing the refrigerant circulation amount in the cool storage system; or liquid refrigerant can be smoothly discharged from the refrigerant storage component 210 through the fourth pipe 234, thereby increasing the refrigerant circulation amount in the cool storage system. This ensures that the refrigerant circulation amount in the cool storage system is at an optimal state throughout the entire cool storage process, thereby improving the cool storage efficiency and performance of the cool storage system. For example, but not limited to, the first valve 231 is a liquid inlet valve, and the second valve 232 is a liquid discharge valve.

[0045] In an optional embodiment, the first pipe 223 and the second pipe 224 are connected to the top of the refrigerant storage component 210, and the third pipe 233 is connected to the bottom of the refrigerant storage component 210.

[0046] In this embodiment, the specific position configuration of the refrigerant adjusting device 200 is optimized. Specifically, the inlets of the first pipe 223 and the second pipe 224 are connected to the top of the refrigerant storage component 210, while the outlet of the third pipe 233 is connected to the bottom or a side wall of the refrigerant storage component 210 at a location proximal to the bottom, so that the gaseous refrigerant can be discharged from the top of the refrigerant storage component 210, while liquid refrigerant can flow into the refrigerant storage component 210 from the bottom, thereby avoiding interference between the gaseous and liquid refrigerant, allowing the refrigerant amount in the refrigerant storage component 210 to increase rapidly, and quickly reducing the refrigerant circulation amount entering the cool storage system and improving the regulation efficiency of the refrigerant circulation. In addition, since the pressure in the refrigerant storage component 210 does not rise rapidly with a large inflow of liquid refrigerant, the situation where liquid refrigerant cannot enter at a later stage due to excessive pressure in the refrigerant storage component 210 is avoided, thereby improving the stability of refrigerant storage.

[0047] In an optional embodiment, the accumulator assembly 300 includes an accumulator 310, a third piping assembly 320, and a fourth piping assembly 330. The third piping assembly 320 connects the liquid-side main pipe 101 and the accumulator 310, and the fourth piping assembly 330 connects the accumulator 310 and the gas-side main pipe 102.

[0048] In this embodiment, the specific configuration of the accumulator assembly 300 is optimized. Specifically, the accumulator assembly 300 is configured as a combined assembly including at least the accumulator 310, the third piping assembly 320, and the fourth piping assembly 330. The accumulator 310 is an energy storage device used for cool storage. The third piping assembly 320 is configured to transport liquid refrigerant from the liquid-side main pipe 101 into the accumulator 310 to achieve heat exchange and cool storage. The fourth piping assembly 330 is configured to transport gaseous refrigerant from the accumulator 310 to the gas-side main pipe 102 to achieve gaseous refrigerant circulation.

[0049] In an embodiment, the top of the accumulator 310 is provided with capillary tubes and a dispenser. The capillary tubes are in an umbrella shape and connected to the top of the accumulator 310, and the dispenser is disposed on a side of the capillary tubes away from the accumulator 310. The third piping assembly 320 is connected to the dispenser at the top, and the fourth piping assembly 330 is connected to the bottom of the accumulator 310.

[0050] In an optional embodiment, the third piping assembly 320 includes a third valve 321, a fourth valve 322, a fifth pipe 323, and a sixth pipe 324. The inlet of the fifth pipe 323 is connected to the liquid-side main pipe 101, and the outlet of the fifth pipe 323 is connected to the accumulator 310. The sixth pipe 324 connects the fifth pipe 323 and the fourth piping assembly 330. The third valve 321 is disposed in the fifth pipe 323, and the fourth valve 322 is disposed in the sixth pipe 324.

[0051] In this embodiment, the specific configuration of the third piping assembly 320 is optimized. Specifically, the third piping assembly 320 is configured as a combined assembly including at least the third valve 321, the fourth valve 322, the fifth pipe 323, and the sixth pipe 324. The fifth pipe 323 is configured to transport liquid refrigerant to the accumulator 310 by opening the third valve 321, or stop transporting liquid refrigerant to the accumulator 310 by closing the third valve 321. The fourth valve 322 can be opened or closed to conduct or cut off the sixth pipe 324, thereby achieving communication or isolation between the fourth piping assembly 330 and the fifth pipe 323. For example, but not limited to, the third valve 321 is a cool storage expansion valve 130, and the fourth valve 322 is a front cool release valve. In this way, heat exchange and cold release of circulating refrigerant can be achieved in the accumulator 310, thereby improving the cool storage capacity of the accumulator 310.

[0052] In an optional embodiment, the third piping assembly 320 further includes a fifth valve 325, a sixth valve 326, and a seventh pipe 327. The inlet of the seventh pipe 327 is connected to the accumulator 310, and the outlet of the seventh pipe 327 is connected to the liquid-side main pipe 101 downstream of the fifth pipe 323. The fifth valve 325 is disposed in the seventh pipe 327, and the sixth valve 326 is disposed in the liquid-side main pipe 101 located between the fifth pipe 323 and the seventh pipe 327.

[0053] In this embodiment, the specific configuration of the fourth piping assembly 330 is optimized. Specifically, the third piping assembly 320 is configured as a combined assembly including at least the third valve 321, the fourth valve 322, the fifth pipe 323, the sixth pipe 324, the fifth valve 325, the sixth valve 326, and the seventh pipe 327. Thus, the fifth valve 325 can be opened or closed to conduct or cut off the seventh pipe 327, thereby achieving communication or isolation between the accumulator 310 and the liquid-side main pipe 101. Furthermore, the sixth valve 326 can be opened or closed to conduct or cut off the liquid-side main pipe 101, thereby achieving communication or isolation between the accumulator 310 and the liquid-side main pipe 101. For example, but not limited to, the fifth valve 325 is a post cool release valve, and the sixth valve 326 is a bypass valve.

[0054] In an optional embodiment, the fourth piping assembly 330 includes a seventh valve 331 and an eighth pipe 332. The eighth pipe 332 connects the accumulator 310 and the gas-side main pipe 102, and the seventh valve 331 is disposed in the eighth pipe 332.

[0055] In this embodiment, the specific configuration of the fourth piping assembly 330 is further optimized. Specifically, the fourth piping assembly 330 is configured as a combined assembly including at least the seventh valve 331 and the eighth pipe 332. Thus, the seventh valve 331 can be opened or closed to conduct or cut off the eighth pipe 332, thereby achieving communication or isolation between the accumulator 310 and the gas-side main pipe 102. For example, but not limited to, the seventh valve 331 is a heat storage valve.

[0056] In an optional 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 pipeline 103 is connected to the inlet of the compressor 110.

[0057] In this embodiment, the specific configuration of the outdoor unit 100 is optimized. Specifically, the outdoor unit 100 is configured as a combined assembly including at least the liquid-side main pipe 101, the gas-side main pipe 102, the low-pressure pipeline 103, the compressor 110, the four-way valve 120, and the expansion valve 130. The expansion valve 130 can 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 thereof, then enters the expansion valve 130 through the E-port of the four-way valve 120 to form a high-temperature and medium-pressure liquid, and finally enters the liquid-side main pipe 101. The low-temperature and medium-pressure gas discharged from the accumulator assembly 300 flows through the medium-pressure pipe and enters the C-port of the four-way valve 120, and then flows through the S-port of the four-way valve 120 to enter the inlet of the compressor 110. The gaseous and liquid refrigerant discharged from the outlet of the refrigerant adjusting device 200 flows through the low-pressure pipeline 103 to enter the inlet of the compressor 110, thus completing the refrigerant circulation of the cool storage system.

[0058] In an embodiment, the outdoor unit 100 also includes a heat exchanger 140 and a gas-liquid separator 150. The heat exchanger 140 is connected between the E-port of the four-way valve 120 and the expansion valve 130 via a pipe, and the gas-liquid separator 150 is connected between the S-port of the four-way valve 120 and the compressor 110 via a pipe. Thus, the high-temperature and high-pressure gas discharged from the compressor 110 enters the four-way valve 120 through the D-port thereof, then flows out from the E-port of the four-way valve 120, and flows through the heat exchanger 140, and enters into the expansion valve 130 to form high-temperature and medium-pressure liquid, and finally enters the liquid-side main pipe 101. The low-temperature and medium-pressure gas discharged from the outlet of the accumulator assembly 300 flows through the medium-pressure pipe and enters the four-way valve 120 through the C-port thereof, then flows from the S-port of the four-way valve 120, and flows through the gas-liquid separator 150, and enters the compressor 110. The gaseous and liquid refrigerant discharged from the outlet of the refrigerant adjusting device 200 flows through the low-pressure pipeline 103 and the gas-liquid separator 150, and enters the compressor 110, thereby completing the refrigerant circulation.

[0059] Referring to FIG. 5, in a second aspect, the present application further provides a control method for the cool storage system as described above, including steps S1 to S4.

[0060] At Step S1, obtain an operating time of the cool storage system.

[0061] At Step S2, when the operating time is greater than a preset time, obtain a first temperature of energy storage material in the accumulator assembly 300.

[0062] At Step S3, when the first temperature is less than or equal to the first preset temperature, and greater than a second preset temperature, control the refrigerant adjusting device 200 to enter a first operating mode. The first preset temperature is greater than the second preset temperature.

[0063] At Step S4, when the first temperature is less than or equal to the second preset temperature, control the refrigerant adjusting device 200 to enter a second operating mode.

[0064] In this embodiment, the operating stage of the cool storage system is first determined based on the operating time and the temperature of the energy storage material of the cool storage system. Different operating commands are then executed to control the cool storage system at different operating stages. Specifically, the operating time of the cool storage system is first obtained to determine whether the cool storage system is in a startup stage. Specifically, when the operating time is greater than the preset time, it is determined that the cool storage system is in a non-startup stage, which is a stage after the startup stage. At this time, the energy storage material in the accumulator assembly 300 gradually cools down, gradually achieving cool storage. Then, the first temperature of the energy storage material in the accumulator assembly 300 is obtained to determine whether the accumulator assembly 300 is in a freezing stage. Specifically, when the first temperature is less than or equal to the first preset temperature and greater than the second preset temperature, it is determined that the accumulator assembly 300 is in a non-freezing stage, and at this time, the energy storage material has not yet condensed, and the refrigerant adjusting device 200 needs to be controlled to operate according to the first operating mode to enable the cool storage system to quickly cool down and perform cool storage. When the first temperature is less than or equal to the second preset temperature, it is determined that the accumulator assembly 300 is in the freezing stage, and at this time, the energy storage material gradually solidifies or freezes, and the refrigerant adjusting device 200 needs to be controlled to operate in the second operating mode, thereby ensuring that the refrigerant circulation amount in the cool storage system is appropriate and the cool storage efficiency reaches the maximum.

[0065] In an embodiment, the preset time is in a range from 6 minutes to 8 minutes, the first preset temperature is higher than the freezing point temperature of the energy storage material, and the second preset temperature is the freezing point temperature of the energy storage material. For example, but not limited to, when the energy storage material is water, the preset time can be 7 minutes, and the first preset temperature can be 4°C, and the second preset temperature can be 0°C.

[0066] In an optional embodiment, the first operating mode includes performing steps S31 to S33.

[0067] At Step S31, obtain a discharge superheat of the outdoor unit 100, control the balancing valve 221 and the first valve 231 of the refrigerant adjusting device 200 to open and the second valve 232 to close, and maintain liquid intake for a first duration.

[0068] At Step S32, determine whether the cool storage system is overcharged with refrigerant, if so, control the balancing valve 221 and the first valve 231 of the refrigerant adjusting device 200 to open and the second valve 232 to close, and maintain liquid intake for a second duration.

[0069] At Step S33, determine whether the cool storage system is undercharged with refrigerant, if so, control the balancing valve 221 and the first valve 231 of the refrigerant adjusting device 200 to close and the second valve 232 to open, and maintain liquid discharge for a third duration.

[0070] In an embodiment, in the first operating mode, the operation mode and the operating time of the refrigerant adjusting device 200 are determined based on at least three parameters: the discharge superheat of the outdoor unit 100, an overcharged state of the cool storage system, and an undercharged state of the cool storage system. The discharge superheat is obtained and compared with a preset superheat value. If the discharge superheat is less than the preset superheat value, it indicates that the refrigerant amount in the refrigerant storage component 210 is too low, and the refrigerant amount in the refrigerant storage component 210 needs to be increased quickly, and in this case, it is needed to control the balancing valve 221 and the first valve 231 of the refrigerant adjusting device 200 to open, and the second valve 232 to close, and maintain this operation for the first duration. Determine whether the refrigerant circulation amount in the cool storage system is excessive. If so, it indicates that the cool storage system is overcharged with refrigerant, and in this case, it is needed to control the balancing valve 221 and the first valve 231 of the refrigerant adjusting device 200 to open, and the second valve 232 to close, and maintain this operation for the second duration to allow the circulating refrigerant in the cool storage system to quickly enter the refrigerant storage component 210 for recovery, thereby reducing the refrigerant circulation amount in the cool storage system. Determine whether the refrigerant circulation amount in the cool storage system is insufficient. If so, it indicates that the cool storage system is undercharged with refrigerant, and in this case, it is needed to control the balancing valve 221 and the first valve 231 of the refrigerant adjusting device 200 to close, and the second valve 232 to open, and maintain this operation for the third duration to allow the refrigerant in the refrigerant storage component 210 to enter the cool storage system, thereby increasing the refrigerant circulation amount in the cool storage system.

[0071] In an embodiment, the preset superheat value is in a range from 14 °C to 16°C. The first preset circulation amount can be calculated based on the cool storage system, the first duration is in a range from 18s to 22s, the second duration is in a range from 9s to 11s, and the third duration is in a range from 9s to 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.

[0072] In an embodiment, when the discharge superheat is detected to be greater than or equal to the preset superheat value, the discharge superheat needs to be detected and compared with the preset superheat value again after a 10-minute interval. If the discharge superheat is low again, the above operation needs to be repeated.

[0073] In an optional embodiment, determining that the discharge superheat is less than a preset superheat value includes step S311.

[0074] At Step S311, obtain a discharge temperature of the compressor 110 and a high-pressure temperature inside the compressor 110. When a difference between the discharge temperature and the high-pressure temperature is greater than a preset difference, it is determined that the discharge superheat is less than the preset superheat value.

[0075] In this embodiment, whether the discharge superheat is less than the preset superheat value is determined by comparing the difference between the discharge temperature and the high-pressure temperature inside the compressor 110 with the preset difference value. Specifically, when the difference between the discharge temperature and the high-pressure temperature is greater than the preset difference value, it is determined that the discharge superheat is less than the preset superheat value. In this case, the circulating refrigerant in the cool storage system needs to be transported to the refrigerant storage component 210 for storage to reduce the refrigerant circulation amount in the cool storage system and increase the discharge superheat. For example, but not limited to, the preset difference value can be 15°C.

[0076] In an optional embodiment, determining whether the cool storage system is overcharged with refrigerant includes steps S321 and S322.

[0077] At Step S321, obtain the high-pressure temperature of the cool storage system as the second temperature, obtain the superheat of the heat exchanger 140 in the accumulator assembly 300 as the third temperature, and simultaneously obtain the minimum discharge superheat of the cool storage system as the fourth temperature.

[0078] At Step S322, when the second temperature is greater than the first preset temperature, and 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.

[0079] In this embodiment, whether the cool storage system is overcharged with refrigerant is determined based on parameters such as the high-pressure temperature of the cool storage system, the superheat of the heat exchanger in the accumulator assembly 300, and the minimum discharge superheat of the cool storage system. Specifically, when the high-pressure temperature of the cool storage system is greater than the first preset temperature, and the superheat of the heat exchanger in the accumulator assembly 300 is less than the second preset temperature, and the minimum discharge superheat of the cool storage system is less than the third preset temperature, it is determined that the cool storage system is overcharged with refrigerant. In this case, it is needed to control the balancing valve 221 and the first valve 231 of the refrigerant adjusting device 200 to open, and control the second valve 232 to close, and maintain this operation for the second duration to allow the circulating refrigerant in the cool storage system to quickly enter the refrigerant storage component 210 for recovery, thereby reducing the refrigerant circulation amount in the cool storage system.

[0080] In an embodiment, the first preset temperature is in a range from 50°C to 60°C, the second preset temperature is in a range from 0.5°C to 2°C, and the third preset temperature is in a range from 8°C to 12°C. For example, but not limited to, the first preset temperature can be 55°C, the second preset temperature can be 1°C, and the third preset temperature can be 10°C.

[0081] In an optional embodiment, determining whether the cool storage system is undercharged with refrigerant includes steps S331 and S332.

[0082] At Step S331, obtain the superheat of the accumulator assembly 300 as the fifth temperature, obtain an opening degree of theexpansion valve 130 of the accumulator assembly 300 as a first opening degree, and simultaneously obtain a difference between the high-pressure temperature of the cool storage system and an ambient temperature as the sixth temperature.

[0083] At Step S332, when the fifth temperature is greater than the fourth preset temperature, and the first opening degree is greater than a first preset opening degree, 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.

[0084] In this embodiment, whether the cool storage system is undercharged with refrigerant is determined based on parameters such as the superheat of the accumulator assembly 300, the opening degree of the expansion valve 130 of the accumulator assembly 300, and the difference between the high-pressure temperature of the cool storage system and the ambient temperature. Specifically, when the superheat of the accumulator assembly 300 is greater than the fourth preset temperature, the opening degree of the expansion valve 130 of the accumulator assembly 300 is greater than the first preset opening degree, and the difference between the high-pressure temperature of the cool storage system and the ambient temperature is less than the fifth preset temperature, it is determined that the cool storage system is undercharged with refrigerant. In this case, it is needed to control the balancing valve 221 and the first valve 231 of the refrigerant adjusting device 200 to close, and control the second valve 232 to open, and maintain this operation for the third duration to allow the refrigerant in the refrigerant storage component 210 to enter the cool storage system, thereby increasing the refrigerant circulation amount in the cool storage system.

[0085] In an embodiment, the fourth preset temperature is in a range from 3°C to 5°C, the first preset opening degree is in a range from 430 steps to 470 steps, and the fifth preset temperature is in a range from 6°C to 10°C. For example, but not limited to, the fourth preset temperature can be 4°C, the first preset opening degree can be 450 steps, and the fifth preset temperature can be 8°C.

[0086] In an optional embodiment, the second operating mode includes performing steps S41 and S42.

[0087] At Step S41, determine whether the cool storage system is overcharged with refrigerant, and if so, control the balancing valve 221 and the first valve 231 of the refrigerant adjusting device 200 to open, and control the second valve 232 to close, and maintain liquid intake for a fourth duration.

[0088] At Step S42, determine whether the cool storage system is undercharged with refrigerant, and if so, control the balancing valve 221 and the first valve 231 of the refrigerant adjusting device 200 to close, and control the second valve 232 to open, and maintain liquid discharge for a fifth duration.

[0089] In this embodiment, in the second operating mode, the operation mode and the operating time of the refrigerant adjusting device 200 need to be determined based on parameters such as the overcharged state of the cool storage system, and the undercharged state of the cool storage system. Specifically, it is determined whether the refrigerant circulation amount in the cool storage system is excessive, and if so, it indicates that the cool storage system is overcharged with refrigerant. In this time, it is needed to control the balancing valve 221 and the first valve 231 of the refrigerant adjusting device 200 to open, and control the second valve 232 to close, and maintain this operation for the fourth duration to allow the circulating refrigerant in the cool storage system to quickly enter the refrigerant storage component 210 for recovery, thereby reducing the refrigerant circulation amount in the cool storage system. It is determined whether the refrigerant circulation amount in the cool storage system is too low or not, and if so, it indicates that the cool storage system is undercharged with refrigerant. In this case, it is needed to control the balancing valve 221 and the first valve 231 of the refrigerant adjusting device 200 to close, and control the second valve 232 to open, and maintain this operation for the fifth duration to allow the refrigerant in the refrigerant storage component 210 to enter the cool storage system, thereby increasing the refrigerant circulation amount in the cool storage system.

[0090] In an embodiment, the second preset circulation amount can be calculated based on the cool storage system, the fourth duration is in a range from 9s to 11s, and the fifth duration is in a range from 9s to 11s. For example, but not limited to, the fourth duration can be 10s, and the fifth duration can be 10s.

[0091] In an optional embodiment, determining whether the cool storage system is overcharged with refrigerant includes steps S411 and S412.

[0092] At Step S411, obtain the high-pressure temperature of the cool storage system as a seventh temperature, obtain the superheat of the heat exchanger 140 of the accumulator assembly 300 as an eighth temperature, and simultaneously obtain the minimum discharge superheat of the cool storage system as a ninth temperature.

[0093] At Step S412, when the seventh temperature is greater than the sixth preset temperature, and 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.

[0094] In this embodiment, whether the cool storage system is overcharged with refrigerant is determined based on parameters such as the high-pressure temperature of the cool storage system, the superheat of the heat exchanger in the accumulator assembly 300, and the obtained minimum discharge superheat of the cool storage system. Specifically, when the high-pressure temperature of the cool storage system is greater than the sixth preset temperature, and the superheat of the heat exchanger in the accumulator assembly 300 is less than the seventh preset temperature, and the minimum discharge superheat of the cool storage system is less than the eighth preset temperature, it is determined that the cool storage system is overcharged with refrigerant. In this case, it is needed to control the balancing valve 221 and the first valve 231 of the refrigerant adjusting device 200 to open, and control the second valve 232 to close, and maintain this operation for the fourth duration to allow the circulating refrigerant in the cool storage system to quickly enter the refrigerant storage component 210 for recovery, thereby reducing the refrigerant circulation amount in the cool storage system.

[0095] In an embodiment, the sixth preset temperature is in a range from 50°C to 60°C, the seventh preset temperature is in a range from 0.5°C to 2°C, and the eighth preset temperature is in a range from 8°C to 12°C. For example, but not limited to, the sixth preset temperature can be 55°C, the seventh preset temperature can be 1°C, and the eighth preset temperature can be 10°C.

[0096] In an optional embodiment, determining whether the cool storage system is undercharged with refrigerant includes steps S421 and S422.

[0097] At Step S421, obtain the superheat of the accumulator assembly 300 as a tenth temperature, obtain a difference between the high-pressure temperature of the cool storage system and an ambient temperature as an eleventh temperature, and simultaneously obtain the high-pressure temperature of the cool storage system as a twelfth temperature.

[0098] At Step S422, when 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.

[0099] In this embodiment, whether the cool storage system is undercharged with refrigerant is determined based on parameters such as the superheat of the accumulator assembly 300, the difference between the high-pressure temperature of the cool storage system and the ambient temperature, and the high-pressure temperature of the cool storage system. Specifically, when the superheat of the accumulator assembly 300 is greater than the ninth preset temperature, and the difference between the high-pressure temperature of the cool storage system and the ambient temperature is less than the tenth preset temperature, and the high-pressure temperature of the cool storage system is less than the eleventh preset temperature, it is determined that the cool storage system is undercharged with refrigerant. In this case, it is needed to control the balancing valve 221 and the first valve 231 of the refrigerant adjusting device 200 to close, and the second valve 232 to open, and maintain this operation for the fifth duration to allow the refrigerant in the refrigerant storage component 210 to enter the cool storage system, thereby increasing the refrigerant circulation amount in the cool storage system.

[0100] In an embodiment, the ninth preset temperature is in a range from 3°C to 5°C, the tenth preset temperature is in a range from 6°C to 10°C, and the eleventh preset temperature is in a range from 36°C to 44°C. For example, but not limited to, the ninth preset temperature can be 4°C, the tenth preset temperature can be 8°C, and the eleventh preset temperature can be 40°C.

[0101] In an optional embodiment, determining whether the cool storage system is undercharged with refrigerant also includes steps S423 to S425.

[0102] At Step S423, obtain a second opening degree of the expansion valve 130 of the accumulator assembly 300.

[0103] At Step S424, when the second opening degree is greater than a second preset opening degree, control the balancing valve 221 and the first valve 231 of the refrigerant adjusting device 200 to close, and control the second valve 232 to open, and maintain liquid discharge for a sixth duration.

[0104] At Step S425, when the second opening degree is less than a third preset opening degree, control pressure relief valve and the first valve 231 of the refrigerant adjusting device 200 to open, control the balancing valve 221 and the second valve 232 to close, and maintain liquid intake for a seventh duration. The third preset opening degree is less than the second preset opening degree.

[0105] In this embodiment, whether the cool storage system is undercharged with refrigerant is determined based on parameters such as the superheat of the accumulator assembly 300, the difference between the high-pressure temperature of the cool storage system and the ambient temperature, the high-pressure temperature of the cool storage system, and the opening degree of the expansion valve 130 of the accumulator assembly 300. Specifically, when the opening degree of the expansion valve 130 of the accumulator assembly 300 is greater than the second preset opening degree, it is determined that the cool storage system is undercharged with refrigerant. In this case, it is needed to control the balancing valve 221 and the first valve 231 of the refrigerant adjusting device 200 to close, and control the second valve 232 to open, and maintain this operation for the sixth duration to allow the refrigerant in the refrigerant storage component 210 to enter the cool storage system, thereby increasing the refrigerant circulation amount in the cool storage system. When the opening degree of the expansion valve 130 of the accumulator assembly 300 is less than the third preset opening degree, it is determined that the refrigerant circulation amount in the cool storage system is relatively large. In this case, it is needed to control the pressure relief valve and the first valve 231 of the refrigerant adjusting device 200 to open, control the balancing valve 221 and the second valve 232 to close, and maintain this operation for the seventh duration to allow the circulating refrigerant in the cool storage system to gradually enter the refrigerant storage component 210 for recovery, thereby gradually reducing the refrigerant circulation amount in the cool storage system.

[0106] In an embodiment, the second preset opening degree is in a range from 240 steps to 260 steps, the third preset opening degree is in a range from 80 steps to 90 steps, the sixth duration is in a range from 9s to 11s, and the seventh duration is in a range from 4s to 6s. For example, but not limited to, the second preset opening degree can be 250 steps, the third preset opening degree can be 85 steps, the sixth duration can be 10s, and the seventh duration can be 5s.

[0107] In an optional embodiment, the control method for the cool storage system of the present application further includes step S5.

[0108] At Step S5, when the operating time is less than or equal to the preset time, control the refrigerant adjusting device 200 to enter a third operating mode.

[0109] In this embodiment, specifically, the operating time of the cool storage system is first obtained to determine whether the cool storage system is in the startup stage. Specifically, when the operating time is less than or equal to the preset time, it is determined that the cool storage system is in the startup stage, and an initial refrigerant amount adjustment is required for the accumulator assembly 300, and in this case, the refrigerant adjustment device 200 is controlled to operate according to the third operation mode.

[0110] In an optional embodiment, the third operating mode includes performing steps S51 and S52.

[0111] At Step S51, control the balancing valve 221 and the first valve 231 of the refrigerant adjusting device 200 to close, and control the second valve 232 to open, and maintain liquid discharge for an eighth duration.

[0112] At Step S52, control the balancing valve 221 and the first valve 231 of the refrigerant adjusting device 200 to open, and control the second valve 232 to close, and maintain liquid intake for a ninth duration.

[0113] In this embodiment, the third operating mode is divided into two stages. In the first stage, the balancing valve 221 and the first valve 231 of the refrigerant adjusting device 200 must be closed, and the second valve 232 must be opened, and this operation must be maintained for the eighth duration to completely empty the refrigerant from the refrigerant storage component 210, thus avoiding an inaccurate total refrigerant amount in the refrigerant storage component 210 caused by an unknown amount of residual refrigerant. In the second stage, the balancing valve 221 and the first valve 231 of the refrigerant adjusting device 200 must be opened, and the second valve 232 must be closed, and this operation must be maintained for the ninth duration to quickly replenish the refrigerant in the refrigerant storage component 210.

[0114] In an embodiment, the eighth duration is in a range from 1.5 min to 3 min, and the ninth duration is in a range from 4.5 min to 6 min. For example, but not limited to, the eighth duration can be 2 min, and the ninth duration can be 5 min.

[0115] In a third aspect, the present application further provides a storage medium, having a computer program stored thereon. The computer program is configured to, when executed, performs the control method for the cool storage system as described above. For the control logic of the control method for the cool storage system, reference can be made to the above embodiments. Since the storage medium adopts all the technical solutions of all the above embodiments, it possesses at least all beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeatedly described herein.

[0116] It should be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" as used herein may be intended to include the plural forms as well. The terms "comprise", "include", "contain", and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring to be performed in the particular order discussed or illustrated, unless an order of performance is specifically indicated. It should also be understood that additional or alternative steps may be employed.

[0117] Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first", "second", and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0118] The foregoing description is merely specific embodiments of the present application 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 applied to other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cool storage system, <b>characterized by comprising: an outdoor unit, comprising a liquid-side main pipe, a gas-side main pipe, and a low-pressure pipeline; a refrigerant adjusting device, comprising a refrigerant storage component, a first piping assembly, and a second piping assembly; an inlet of the first piping assembly being connected to the refrigerant storage component, and an outlet of the first piping assembly being connected to the low-pressure pipeline; an inlet of the second piping assembly being connected to the liquid-side main pipe, and an outlet of the second piping assembly being connected to the refrigerant storage component and the first piping assembly; and an accumulator assembly connected in parallel between the liquid-side main pipe and the gas-side main pipe.

2. The cool storage system according to claim 1, wherein the first piping assembly comprises a balancing valve, a pressure relief valve, a first pipe, and a second pipe; the first pipe connects the refrigerant storage component and the low-pressure pipeline; the second pipe connects the refrigerant storage component and the first pipe; the balancing valve is disposed in the first pipe; and the pressure relief valve is disposed in the second pipe.

3. The cool storage system according to claim 2, wherein the second piping assembly comprises a first valve, a second valve, a third pipe, and a fourth pipe; the third pipe connects the liquid-side main pipe and the refrigerant storage component; the fourth pipe connects the third pipe and the first pipe; the first valve is disposed in the third pipe; and the second valve is disposed in the fourth pipe.

4. The cool storage system according to claim 3, wherein the first pipe and the second pipe are connected to a top of the refrigerant storage component, and the third pipe is connected to a bottom of the refrigerant storage component.

5. The cool storage system according to any one of claims 1 to 4, wherein the accumulator assembly comprises an accumulator, a third piping assembly, and a fourth piping assembly; the third piping assembly connects the liquid-side main pipe and the accumulator; and the fourth piping assembly connects the accumulator and the gas-side main pipe.

6. The cool storage system according to claim 5, wherein the third piping assembly comprises a third valve, a fourth valve, a fifth pipe, and a sixth pipe; an inlet of the fifth pipe is connected to the liquid-side main pipe, and an outlet of the fifth pipe is connected to the accumulator; the sixth pipe connects the fifth pipe and the fourth piping assembly; the third valve is disposed in the fifth pipe; and the fourth valve is disposed in the sixth pipe.

7. The cool storage system according to claim 6, wherein the third piping assembly further comprises a fifth valve, a sixth valve, and a seventh pipe; an inlet of the seventh pipe is connected to the accumulator, and an outlet of the seventh pipe is connected to the liquid-side main pipe downstream of the fifth pipe; the fifth valve is disposed in the seventh pipe; and the sixth valve is disposed in the liquid-side main pipe located between the fifth pipe and the seventh pipe.

8. The cool storage system according to claim 6 or 7, wherein the fourth piping assembly comprises a seventh valve and an eighth pipe; the eighth pipe connects the accumulator and the gas-side main pipe; and the seventh valve is disposed in the eighth pipe.

9. The cool storage system according to any one of claims 1 to 8, wherein the outdoor unit further comprises a compressor, a four-way valve, and an expansion valve; an outlet of the compressor is connected to a D-port of the four-way valve; an S-port of the four-way valve is connected to an inlet of the compressor; a C-port of the four-way valve is connected to the gas-side main pipe; an E-port of the four-way valve is connected to the expansion valve; an 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.

10. A control method for the cool storage system according to any one of claims 1 to 9, comprising: obtaining an operating time of the cool storage system; obtaining a first temperature of energy storage material in the accumulator assembly when the operating time is greater than a preset time; controlling the refrigerant adjusting device to enter a first operating mode when the first temperature is less than or equal to a first preset temperature, and greater than a second preset temperature, wherein the first preset temperature is greater than the second preset temperature; and controlling the refrigerant adjusting device to enter a second operating mode when the first temperature is less than or equal to the second preset temperature.

11. The control method according to claim 10, wherein the first operating mode comprises:obtaining a discharge superheat of the outdoor unit; and when the discharge superheat is less than a preset superheat value, controlling a balancing valve and a first valve of the refrigerant adjusting device to open, controlling a second valve to close, and maintaining liquid intake for a first duration; determining whether the cool storage system is overcharged with refrigerant; and if so, controlling the balancing valve and the first valve of the refrigerant adjusting device to open, controlling the second valve to close, and maintaining liquid intake for a second duration; and determining whether the cool storage system is undercharged with refrigerant; and if so, controlling the balancing valve and the first valve of the refrigerant adjusting device to close, controlling the second valve to open, and maintaining liquid discharge for a third duration.

12. The control method according to claim 11, wherein determining that the discharge superheat is less than the preset superheat value comprises: obtaining a discharge temperature of a compressor and a high-pressure temperature inside the compressor; and determining that the discharge superheat is less than the preset superheat value, when a difference between the discharge temperature and the high-pressure temperature is greater than a preset difference.

13. The control method according to claim 11 or 12, wherein determining whether the cool storage system is overcharged with refrigerant comprises: obtaining a high-pressure temperature of the cool storage system as a second temperature, obtaining a superheat of a heat exchanger in the accumulator assembly as a third temperature, and simultaneously obtaining a minimum discharge superheat of the cool storage system as a fourth temperature; and determining that a first refrigerant circulation amount is greater than a first preset circulation amount, when the second temperature is greater than the first preset temperature, and the third temperature is less than the second preset temperature, and the fourth temperature is less than a third preset temperature.

14. The control method according to any one of claims 11 to 13, wherein determining whether the cool storage system is undercharged with refrigerant comprises: obtaining a superheat of the accumulator assembly as a fifth temperature, obtaining an opening degree of an expansion valve of the accumulator assembly as a first opening degree, and simultaneously obtaining a difference between a high-pressure temperature of the cool storage system and an ambient temperature as a sixth temperature; and determining that a first refrigerant circulation amount is less than a first preset circulation amount when the fifth temperature is greater than a fourth preset temperature, and the first opening degree is greater than a first preset opening degree, and the sixth temperature is less than a fifth preset temperature.

15. The control method according to any one of claims 10 to 14, wherein the second operating mode comprises: determining whether the cool storage system is overcharged with refrigerant; and if so, controlling a balancing valve and a first valve of the refrigerant adjusting device to open, and controlling a second valve to close, and maintaining liquid intake for a fourth duration; and determining whether the cool storage system is undercharged with refrigerant; and if so, controlling the balancing valve and the first valve of the refrigerant adjusting device to close, and controlling the second valve to open, and maintaining liquid discharge for a fifth duration.

16. The control method according to claim 15, wherein determining whether the cool storage system is overcharged with refrigerant comprises: obtaining a high-pressure temperature of the cool storage system as a seventh temperature, obtaining a superheat of a heat exchanger of the accumulator assembly as an eighth temperature, and simultaneously obtaining a minimum discharge superheat of the cool storage system as a ninth temperature; and determining that a second refrigerant circulation amount is greater than a second preset circulation amount, when the seventh temperature is greater than a sixth preset temperature, and the eighth temperature is less than a seventh preset temperature, and the ninth temperature is less than an eighth preset temperature.

17. The control method according to claim 15 or 16, wherein determining whether the cool storage system is undercharged with refrigerant comprises: obtaining a superheat of the accumulator assembly as a tenth temperature, obtaining a difference between a high-pressure temperature of the cool storage system and an ambient temperature as an eleventh temperature, and simultaneously obtaining the high-pressure temperature of the cool storage system as a twelfth temperature; and determining that a first refrigerant circulation amount is less than a first preset circulation amount, when the tenth temperature is greater than a ninth preset temperature, and the eleventh temperature is less than a tenth preset temperature, and the twelfth temperature is less than an eleventh preset temperature.

18. The control method according to claim 17, wherein determining whether the cool storage system is undercharged with refrigerant further comprises: obtaining an opening degree of an expansion valve of the accumulator assemblyas a second opening degree; when the second opening degree is greater than a second preset opening degree, controlling the balancing valve and the first valve of the refrigerant adjusting device to close, and controlling the second valve to open, and maintaining liquid discharge for a sixth duration; and when the second opening degree is less than a third preset opening degree, controlling a pressure relief valve and the first valve of the refrigerant adjusting device to open, controlling the balancing valve and the second valve to close, and maintaining liquid intake for a seventh duration; wherein the third preset opening degree is less than the second preset opening degree.

19. The control method according to any one of claims 10 to 18, further comprising: controlling the refrigerant adjusting device to enter a third operating mode when the operating time is less than or equal to the preset time.

20. The control method according to claim 19, wherein the third operating mode comprises: controlling a balancing valve and a first valve of the refrigerant adjusting device to close, controlling the second valve to open, and maintaining liquid discharge for an eighth duration; and controlling the balancing valve and the first valve of the refrigerant adjusting device to open, controlling the second valve to close, and maintaining liquid intake for a ninth duration.

21. A storage medium, wherein a computer program is stored in the storage medium, and the computer program is configured to, when executed, perform the control method for the cool storage system according to any one of claims 10 to 20.

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