Refrigeration system

Abstract

The utility model discloses a refrigerating system. The refrigerating system is applied to the refrigeration house, the refrigeration house comprises a low-temperature area and a high-temperature area, and the refrigerating system comprises a liquid supply device, a refrigerating fluid storage device and a control device, the air cooler is located in the low-temperature area and connected with the liquid supply device to form a refrigerating loop; the at least one low-temperature area cold storage plate is mounted at the at least one goods shelf of the low-temperature area in a one-to-one correspondence manner, and the low-temperature area cold storage plate is connected with the liquid supply device to form a cold storage loop; and the at least one high-temperature area cold storage plate is installed at the at least one goods shelf of the high-temperature area in a one-to-one correspondence mode, the low-temperature area cold storage plate and the high-temperature area cold storage plate are connected through a secondary refrigerant pipeline to form a secondary refrigerant loop, and the cold capacity of the low-temperature area cold storage plate is sent to the high-temperature area cold storage plate through the secondary refrigerant loop for cold storage or cold release. The condition that the temperature of the refrigeration house is not uniform can be effectively improved, redundant cold energy generated after cold storage and discharge of a low-temperature area are completed is fully utilized, and a high-temperature refrigeration system is omitted.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration, in particular to a refrigeration system. Background Art

[0002] Cold storage is an application technology that stores cold energy below ambient temperature for subsequent use. It is a supplement and adjustment to refrigeration technology and an economically feasible way to coordinate the mismatch between supply and demand of cold energy in terms of time and intensity.

[0003] The cold storage's refrigeration system consists of a liquid supply device and a terminal. The liquid supply device includes: a refrigeration unit, a condenser, a siphon tank, and a gas-liquid separator, etc. The refrigeration unit includes a compressor, an oil separator, an oil cooler, a liquid receiver, and other devices. The terminal includes an air cooler and a cold storage plate. The liquid supply device compresses and condenses the gaseous refrigerant to obtain liquid refrigerant for supply to the terminal. During off-peak electricity price periods, the liquid supply device provides two parts of cold energy: one part is used to cool the cold storage through the air cooler, and the other part is stored through the cold storage process of the cold storage plate. During peak electricity consumption periods, the liquid supply device and air cooler can stop working, and the cold storage is cooled by the process of releasing cold energy through the cold storage plate.

[0004] At present, cold storage plates are generally installed at the air outlet of the air cooler or on the walls around the cold storage. When the cold storage plates release cold, the temperature distribution in the cold storage will be uneven. If the cold storage is divided into low-temperature and high-temperature areas, low-temperature refrigeration systems and high-temperature refrigeration systems need to be set up separately, and the refrigeration, cold storage and cold release of each area need to be controlled separately, which is costly. In addition, the above-mentioned cold storage and release control scheme cannot fully utilize the cooling capacity of the refrigerant during peak and valley periods, and cannot achieve optimal economic efficiency.

[0005] With regard to the problem that the cold storage refrigeration system in the prior art cannot fully utilize the cooling capacity, resulting in poor economic efficiency, no effective solution has been proposed so far. Utility Model Content

[0006] The embodiment of the present invention provides a refrigeration system to at least solve the problem in the prior art that the refrigeration system of a cold storage cannot fully utilize the cooling capacity, resulting in poor economy.

[0007] In order to solve the above technical problems, an embodiment of the present utility model provides a refrigeration system applied to a cold storage, wherein the cold storage includes a low temperature zone and a high temperature zone, and the refrigeration system includes:

[0008] A liquid supply device, used for compressing and condensing the refrigerant to output the refrigerant liquid;

[0009] an air cooler located in the low-temperature zone and connected to the liquid supply device to form a refrigeration circuit;

[0010] At least one low-temperature zone cold storage plate is installed on at least one shelf in the low-temperature zone in a one-to-one correspondence, and the low-temperature zone cold storage plate is connected to the liquid supply device to form a cold storage circuit;

[0011] At least one high-temperature zone cold storage plate is installed in a one-to-one correspondence on at least one shelf in the high-temperature zone. The low-temperature zone cold storage plate is connected to the high-temperature zone cold storage plate through a coolant pipeline to form a coolant circuit. The cold energy of the low-temperature zone cold storage plate is delivered to the high-temperature zone cold storage plate through the coolant circuit for cold storage or cooling.

[0012] Optionally, in the refrigerant circuit, all low-temperature zone cold storage plates are connected in sequence, and all high-temperature zone cold storage plates are connected in sequence; or, all low-temperature zone cold storage plates are divided into at least two low-temperature cold storage groups, and all high-temperature zone cold storage plates are divided into at least two high-temperature cold storage groups, and the low-temperature cold storage groups correspond to the high-temperature cold storage groups one-to-one, and any low-temperature cold storage group is connected to its corresponding high-temperature cold storage group to form a refrigerant circuit. In the refrigerant circuit, each low-temperature zone cold storage plate in the low-temperature cold storage group is connected in sequence, and each high-temperature zone cold storage plate in the high-temperature cold storage group is connected in sequence.

[0013] Optionally, a driving pump is provided in the coolant circuit.

[0014] Optionally, a coolant valve is provided on the coolant pipeline between any two directly connected low-temperature zone cold storage plates and high-temperature zone cold storage plates.

[0015] Optionally, the coolant valve is a one-way valve.

[0016] Optionally, the low-temperature zone cold storage plate and the high-temperature zone cold storage plate both include: a cold storage agent inlet, a cold storage agent outlet, a refrigerant inlet, a refrigerant outlet, a coolant inlet and a coolant outlet.

[0017] Optionally, both the low-temperature zone cold storage plate and the high-temperature zone cold storage plate adopt phase change cold storage, and the solution ratio of the cold storage agent is configured according to the required cooling temperature and cold storage temperature.

[0018] Optionally, a first liquid supply valve is provided on the connecting pipeline between the outlet of the liquid supply device and the low-temperature zone cold storage plate.

[0019] Optionally, a second liquid supply valve is provided on the connecting pipeline between the outlet of the liquid supply device and the air cooler.

[0020] By applying the technical solution of the present invention, a low-temperature zone cold storage plate and a high-temperature zone cold storage plate are provided, which are respectively installed on the shelves of the corresponding temperature zones. The uneven temperature of the cold storage can be effectively improved by cooling the cold storage plate; the low-temperature zone cold storage plate is connected to the liquid supply device to form a cold storage circuit, which can directly store cold in the low-temperature zone cold storage plate through the liquid supply device; a coolant is added to the cold storage plate, and the low-temperature zone cold storage plate and the high-temperature zone cold storage plate are connected through a coolant pipeline to form a coolant circuit, and the unused cold capacity of the low-temperature zone cold storage plate is sent to the high-temperature zone cold storage plate through the coolant circuit for cold storage or cooling, without affecting the solid-liquid phase change of the coolant in the low-temperature zone In this way, the circulation of cold capacity in high and low temperature zones is guaranteed, the excess cold capacity after the cold storage plate in the low temperature zone is stored can be used to store cold in the cold storage plate in the high temperature zone, and the excess cold capacity after the cold storage plate in the low temperature zone is discharged can be used to continue to discharge cold in the cold storage plate in the high temperature zone. Through the linkage of cold storage and discharge in high and low temperature zones, the utilization mode of the cold storage capacity of the cold storage plate is optimized, and the excess cold capacity after the cold storage and discharge in the low temperature zone is fully utilized and allocated to avoid waste of cold capacity. The high temperature zone relies on the cold storage plate for cooling, and there is no need to set up a refrigeration system separately for the high temperature zone, which eliminates the high temperature refrigeration system, reduces costs, and solves the problem that the cold storage refrigeration system in the prior art cannot fully utilize the cold capacity, resulting in poor economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of a refrigeration system provided by an embodiment of the present utility model;

[0022] Figure 2 It is a schematic diagram of a liquid supply device provided by an embodiment of the present utility model;

[0023] Figure 3 This is a schematic diagram of the installation of a cold storage plate in a cold storage provided by an embodiment of the present utility model;

[0024] Figure 4 This is a schematic structural diagram of a cold storage plate provided by an embodiment of the present utility model;

[0025] Figure 5 This is a flow chart of the refrigeration control method provided by an embodiment of the present utility model;

[0026] Figure 6 This is a refrigeration control flow chart provided by an embodiment of the present utility model;

[0027] Description of reference numerals:

[0028] Liquid supply device 10, air cooler 20, low temperature zone cold storage plate 30, high temperature zone cold storage plate 40, shelf 50, storage body 60, refrigeration unit 11, condenser 12, siphon tank 13, gas-liquid separator 14, first liquid supply valve 31, second liquid supply valve 21, and refrigerant valve 41. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0030] It should be noted that the terms "first", "second", etc. in the specification, claims, and drawings of the present invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or that are inherent to these processes, methods, products, or apparatus.

[0031] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0032] Optional embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0033] Example 1

[0034] This embodiment provides a refrigeration system for use in a cold storage. The cold storage includes a low-temperature zone and a high-temperature zone. The temperature of the low-temperature zone is lower than that of the high-temperature zone. For example, the temperature of the low-temperature zone ranges from -20°C to -18°C, while the temperature of the high-temperature zone ranges from 0°C to 5°C. The low-temperature zone is provided with at least one shelf, and the high-temperature zone is provided with at least one shelf. Items can be placed in the low-temperature zone or the high-temperature zone according to storage requirements.

[0035] Figure 1 Schematic diagram of the refrigeration system provided by the embodiment of the present utility model. Figure 1 As shown, the refrigeration system includes: a liquid supply device 10, an air cooler 20, a low temperature zone cold storage plate 30 and a high temperature zone cold storage plate 40. The air cooler 20, the low temperature zone cold storage plate 30 and the high temperature zone cold storage plate 40 are all used as the end of the refrigeration system.

[0036] The liquid supply device 10 is used to compress and condense the refrigerant to output the refrigerant liquid to supply the air cooler 20 and / or the low temperature zone cold storage plate 30. The outlet of the liquid supply device 10 is connected to the liquid supply pipe, and the inlet of the liquid supply device 10 is connected to the return air pipe.

[0037] The air cooler 20 is located in the low-temperature zone and is connected to the liquid supply device 10 to form a refrigeration circuit. That is, the refrigerant inlet of the air cooler 20 is connected to the liquid supply pipe of the liquid supply device 10, and the refrigerant outlet of the air cooler 20 is connected to the return air pipe of the liquid supply device 10. There is at least one air cooler 20. When two or more air coolers 20 are provided, these air coolers 20 are connected in parallel.

[0038] The number of the low temperature zone cold storage plate 30 is at least one, and the number of the high temperature zone cold storage plate 40 is at least one. Figure 3 At least one low-temperature zone cold storage plate 30 is installed in a one-to-one correspondence at at least one shelf 50 in the low-temperature zone, and at least one high-temperature zone cold storage plate 40 is installed in a one-to-one correspondence at at least one shelf 50 in the high-temperature zone.

[0039] The low-temperature cold storage plate 30 is connected to the liquid supply device 10 to form a cold storage circuit. That is, the refrigerant inlet of the low-temperature cold storage plate 30 is connected to the liquid supply pipe of the liquid supply device 10, and the refrigerant outlet of the low-temperature cold storage plate 30 is connected to the return air pipe of the liquid supply device 10. When two or more low-temperature cold storage plates 30 are provided, these low-temperature cold storage plates 30 are connected to the liquid supply device 10 in parallel.

[0040] The low temperature zone cold storage plate 30 and the high temperature zone cold storage plate 40 are connected through a coolant pipeline to form a coolant circuit, through which the cold energy of the low temperature zone cold storage plate 30 is sent to the high temperature zone cold storage plate 40 for cold storage or cooling.

[0041] In this embodiment, a low-temperature zone cold storage plate 30 and a high-temperature zone cold storage plate 40 are provided, which are respectively installed on the shelves of the corresponding temperature zones. The cooling of the cold storage plate can effectively improve the uneven temperature of the cold storage; the low-temperature zone cold storage plate 30 is connected to the liquid supply device 10 to form a cold storage circuit, and the low-temperature zone cold storage plate 30 can be directly cooled by the liquid supply device 10; a coolant is added to the cold storage plate, and the low-temperature zone cold storage plate 30 and the high-temperature zone cold storage plate 40 are connected by a coolant pipeline to form a coolant circuit, and the unused cold capacity of the low-temperature zone cold storage plate 30 is sent to the high-temperature zone cold storage plate 40 for cooling or cooling through the coolant circuit, without affecting the solid-liquid phase change of the coolant in the low-temperature zone Under this circumstance, the circulation of cold capacity in high and low temperature zones is guaranteed, the excess cold capacity after the cold storage plate 30 in the low temperature zone is stored can be used to store cold in the cold storage plate 40 in the high temperature zone, and the excess cold capacity after the cold storage plate 30 in the low temperature zone is released can be used to continue to release cold in the cold storage plate 40 in the high temperature zone. Through the linkage of cold storage and release in high and low temperature zones, the utilization mode of the cold storage capacity of the cold storage plate is optimized, and the excess cold capacity after the cold storage and release in the low temperature zone is fully utilized and allocated to avoid waste of cold capacity. The high temperature zone relies on the cold storage plate for cooling, and there is no need to set up a refrigeration system separately for the high temperature zone, which eliminates the high temperature refrigeration system, reduces costs, and solves the problem that the cold storage refrigeration system in the prior art cannot fully utilize the cold capacity, resulting in poor economy.

[0042] like Figure 2 As shown, the liquid supply device 10 includes: a refrigeration unit 11, a condenser 12, a siphon tank 13 and a gas-liquid separator 14. The refrigeration unit 11 includes a compressor, an oil separator, an oil cooler, a liquid storage tank and other components, and the condenser 12 can be an evaporative condenser. The high-temperature and high-pressure gaseous refrigerant discharged from the compressor enters the condenser 12 after passing through the oil separator, is cooled in the condenser 12, and then flows into the siphon tank 13 through the downpipe (which plays the role of liquid separation in the low-temperature refrigeration system). The output of the siphon tank 13 is divided into two branches: one branch overflows into the liquid storage tank in the refrigeration unit 11, and then enters the gas-liquid separator 14 for supercooling and is supplied to the air cooler 20 and / or the low-temperature zone cold storage plate 30 through the liquid supply pipe. The refrigerant after evaporation at the end enters the gas-liquid separator 14 through the return gas pipe. The separated gaseous refrigerant returns to the compressor, and the separated liquid refrigerant is stored in the gas-liquid separator 14 to avoid liquid hammer in the compressor caused by incomplete evaporation of the end refrigerant; the other branch flows out from the bottom of the siphon tank 13 and is separated by gravity into the oil cooler of the refrigeration unit 11. In the oil cooler, the high-pressure and medium-temperature refrigerant liquid exchanges heat with the compressor lubricating oil to ensure the cooling of the lubricating oil. The liquid refrigerant absorbs heat from the lubricating oil and becomes gas, and then returns to the condenser 12 for re-condensation.

[0043] The specific connection of the refrigerant circuit can be any of the following methods:

[0044] (1) In the coolant circuit, all the cold storage plates 30 in the low temperature zone are connected in sequence, and all the cold storage plates 40 in the high temperature zone are connected in sequence, that is, all the cold storage plates as a whole constitute a coolant circuit, refer to Figure 1 This connection method of the refrigerant circuit is easy to control.

[0045] (2) All low-temperature zone cold storage plates 30 are divided into at least two low-temperature cold storage groups, and all high-temperature zone cold storage plates 40 are divided into at least two high-temperature cold storage groups. The low-temperature cold storage groups correspond to the high-temperature cold storage groups one by one. Any low-temperature cold storage group is connected to its corresponding high-temperature cold storage group to form a refrigerant circuit. In this refrigerant circuit, the low-temperature zone cold storage plates in the low-temperature cold storage group are connected in sequence, and the high-temperature zone cold storage plates in the high-temperature cold storage group are connected in sequence. In other words, they can be grouped to form multiple refrigerant circuits, and each refrigerant circuit can be controlled separately.

[0046] In method (2), each low-temperature cold storage group includes at least one low-temperature zone cold storage plate, and each high-temperature cold storage group includes at least one high-temperature zone cold storage plate. The loads of the corresponding low-temperature cold storage group and the high-temperature cold storage group are matched to ensure that the unused cooling capacity of the low-temperature cold storage group can meet the cooling capacity demand of the corresponding high-temperature cold storage group. Figure 3 Low-temperature cold storage groups and their corresponding high-temperature cold storage groups can be divided according to the location of the racks 50. For example, the cold storage plates corresponding to the low-temperature and high-temperature racks on the same floor form a brine circuit. This brine circuit connection method is more targeted and can more effectively utilize cooling capacity.

[0047] A drive pump can be installed in the refrigerant circuit to provide circulation power for the refrigerant, facilitating full utilization of cooling capacity. The drive pump is turned on when cooling capacity needs to be transferred from the low-temperature area to the high-temperature area, and turned off when cooling capacity is no longer needed.

[0048] A brine valve 41 is installed on the brine pipeline between any two directly connected low-temperature and high-temperature storage plates. When cooling is required from the low-temperature zone to the high-temperature zone, brine valve 41 is opened; when cooling is not required, brine valve 41 is closed. In this embodiment, the brine valve 41 controls the flow of brine between the high and low temperature zones.

[0049] Preferably, the refrigerant valve 41 is a one-way valve. The conduction direction of the one-way valve must ensure that the refrigerant in the refrigerant circuit can circulate and transfer cooling energy from the low-temperature area to the high-temperature area. In this embodiment, the refrigerant valve 41 is a one-way valve to prevent the refrigerant from flowing back.

[0050] like Figure 4As shown, the low-temperature zone cold storage plate 30 and the high-temperature zone cold storage plate 40 both include: a coolant inlet, a coolant outlet, a refrigerant inlet, a refrigerant outlet, a coolant inlet and a coolant outlet to connect the corresponding coolant inlet pipe, coolant outlet pipe, refrigerant inlet pipe, refrigerant outlet pipe, coolant inlet pipe and coolant outlet pipe.

[0051] This embodiment adopts a three-pipe cold storage plate and adds a coolant channel. The working fluids that can flow in the cold storage plate are refrigerant, coolant and coolant. The circulation of refrigerant causes the coolant in the cold storage plate to change phase, thereby storing cold. The coolant phase change can be used to release the cold. The circulation of the coolant between the low-temperature zone cold storage plate 30 and the high-temperature zone cold storage plate 40 can transport the unused cold in the low-temperature zone cold storage plate to the high-temperature zone for cold storage or release. This avoids the situation where the coolant changes from liquid to solid during cold storage, resulting in the cold being unable to flow from the low-temperature zone to the high-temperature zone. Without affecting the solid-liquid phase change in the low-temperature zone, the fluidity of the cold in the high and low-temperature zones is guaranteed, the linkage of cold storage and release in the high and low-temperature zones is realized, and the cold capacity of the cold storage plate is more fully utilized.

[0052] The low temperature zone cold storage plate 30 and the high temperature zone cold storage plate 40 both use phase change cold storage. The solution ratio of the cold storage agent is configured according to the required cooling temperature and cold storage temperature. According to the storage temperature requirements, the corresponding temperature values ​​are set for peak electricity price, flat electricity price and valley electricity price, that is, the peak electricity price temperature upper limit T 峰 , the upper limit of the temperature of the flat electricity price T 平 The upper limit of the valley electricity price temperature T 谷 , T 峰 >T 平 >T 谷 According to T 峰 and T 谷 To set the cooling temperature and cold storage temperature. The cold storage agent can be a eutectic salt solution with a certain ratio. The solution ratio of the cold storage agent is configured according to the required cooling temperature and cold storage temperature. The cold storage agent can form different phase change temperatures according to different solution ratios. The cold storage plate cools according to the phase change temperature, that is, when the ambient temperature of the cold storage plate is greater than the cooling temperature of the cold storage plate, the cold storage plate cools. The configured solution is filled into the cold storage plate as a cold storage agent through the cold storage agent inlet. When the solution ratio of the cold storage agent needs to be changed, the cold storage agent in the cold storage plate can be discharged through the cold storage agent outlet, and new cold storage agent can be filled through the cold storage agent inlet. This embodiment can configure the solution ratio of the cold storage agent according to needs, obtain the required phase change temperature, and can replace the cold storage agent according to needs, so that the cold storage refrigeration can be achieved more economically.

[0053] A first liquid supply valve 31 is provided on the connecting pipe between the outlet of the liquid supply device 10 and the low-temperature zone cold storage plate 30. During cold storage, the first liquid supply valve 31 is opened to allow the liquid supply device 10 to supply cold energy to the cold storage plate. Once cold storage is complete, the first liquid supply valve 31 is closed. In this embodiment, cold storage can be controlled by using the first liquid supply valve 31.

[0054] A second liquid supply valve 21 is provided on the connecting pipe between the outlet of the liquid supply device 10 and the air cooler 20. When the air cooler 20 is supplying cooling, the second liquid supply valve 21 is opened to allow the liquid supply device 10 to supply cooling to the air cooler 20. When the air cooler 20 is no longer required to supply cooling, the second liquid supply valve 21 is closed. In this embodiment, the second liquid supply valve 21 can be used to control whether the air cooler 20 is supplying cooling to the cold storage.

[0055] The first liquid supply valve 31 and the second liquid supply valve 21 can use valves with on-off control functions such as solenoid valves.

[0056] Example 2

[0057] This embodiment provides a refrigeration control method, which is applied to the refrigeration system described in the above embodiment. Figure 5 This is a flow chart of the refrigeration control method provided by the embodiment of the present utility model. Figure 5 As shown, the method includes the following steps:

[0058] S501, determining the current electricity price period and monitoring the temperature in the low temperature zone.

[0059] S502 , during the valley electricity price period, when the temperature in the low temperature zone is less than or equal to the upper limit of the valley electricity price temperature, controlling the cold storage plate to store cold.

[0060] S503, during the peak electricity price period, when the temperature of the low temperature zone is greater than the peak electricity price temperature upper limit, the low temperature zone cold storage plate cools down, and the remaining cold energy of the low temperature zone cold storage plate is sent to the high temperature zone cold storage plate through the coolant circuit for further cooling.

[0061] This embodiment takes into account the electricity price period and monitors the temperature of the low-temperature zone in real time. During the valley electricity price period and when the temperature of the low-temperature zone is less than or equal to the upper limit of the valley electricity price temperature, the cold storage plate is controlled to store cold, ensuring that cold storage is stored while not affecting the refrigeration of the cold storage. During the peak electricity price period and when the temperature of the low-temperature zone is greater than the upper limit of the peak electricity price temperature, the cold storage plate in the low-temperature zone releases cold and sends the remaining cold capacity of the cold storage plate in the low-temperature zone to the cold storage plate in the high-temperature zone through the refrigerant circuit for further cooling. The peak and valley electricity prices are used to realize cooling capacity allocation, and the temperature of the low temperature zone is used as the judgment node to control the cold storage and cooling, so that the cold storage and cooling response is rapid, the control logic response is faster, and the cold storage and cooling are controlled more accurately and quickly, avoiding the drastic fluctuation of the storage temperature due to the frequent loading and unloading of the cold storage; and it is ensured that the cold storage plate only stores cold during the valley electricity price period and only releases cold during the peak electricity price period. At the same time, the excess cold after the cold storage in the low temperature zone is completed can be transported to the high temperature zone for cold storage, and the remaining cold after the low temperature zone is released can be transported to the high temperature zone for secondary cooling, making full use of the cold capacity. There is no need to set up a refrigeration system separately for the high temperature zone, eliminating the high temperature refrigeration system, reducing costs, achieving the optimal economic system, and solving the problem that the cold storage refrigeration system in the existing technology cannot fully utilize the cold capacity and leads to poor economy.

[0062] This embodiment allows you to set temperature thresholds for different electricity price periods, specifically setting upper temperature limits for valley, peak, and flat electricity prices. If the low-temperature zone temperature of the cold storage exceeds the upper temperature limit for any electricity price period, it indicates that the cold storage is too high and requires cooling. The peak price upper temperature limit > the flat price upper temperature limit > the valley price upper temperature limit. This setting can also achieve a certain energy saving effect.

[0063] In one embodiment, controlling the cold storage plate to store cold includes: keeping the air cooler 20, the second liquid supply valve 21 and the liquid supply device 10 open; opening the first liquid supply valve 31 to allow the low-temperature zone cold storage plate 30 to store cold; when the low-temperature zone cold storage plate 30 completes cold storage, opening the refrigerant valve 41 on the refrigerant circuit to allow the cold in the low-temperature zone to flow through the refrigerant pipeline to the high-temperature zone to store cold in the high-temperature zone cold storage plate 40; when the high-temperature zone cold storage plate 40 completes cold storage, closing the first liquid supply valve 31 and the refrigerant valve 41, and stopping the flow of refrigerant into the cold storage circuit.

[0064] When all the coolant liquid inside the cold storage plate has converted to solid, it can be considered that the cold storage plate has reached its upper limit and cold storage is complete. Specifically, the completion of cold storage can be determined by measuring the liquid level or the solid-liquid state inside the cold storage plate.

[0065] In the off-peak electricity price period, when the temperature in the low-temperature zone meets the requirements, the present embodiment maintains normal operation and cooling of the air cooler 20. At the same time, the cold storage plate 30 in the low-temperature zone starts to store cold first (at this time, the first liquid supply valve 31 is opened and the coolant valve 41 remains closed). When the cold storage plate 30 in the low-temperature zone completes cold storage, the coolant valve 41 is opened and the first liquid supply valve 31 remains open, so that the cold in the low-temperature zone flows to the high-temperature zone through the coolant, and the cold storage plate 40 in the high-temperature zone is stored in cold. This ensures that cold is stored only during the off-peak electricity price period, saving electricity, and the excess cold that has not been used in the low-temperature zone is used to store cold in the high-temperature zone, thereby achieving full utilization of the cold capacity and further ensuring economy.

[0066] In one embodiment, the low-temperature zone cold storage plate cools down, and the remaining cold energy from the low-temperature zone cold storage plate is transferred to the high-temperature zone cold storage plate via a brine circuit for further cooling. This process includes: shutting down the air cooler 20, the second liquid supply valve 21, and the liquid supply device 10; cooling the low-temperature zone cold storage plate 30 when its cooling temperature is lower than the low-temperature zone temperature, and cooling the high-temperature zone cold storage plate 40 when its cooling temperature is lower than the high-temperature zone temperature; when the low-temperature zone cold storage plate 30 reaches its cooling limit, opening the brine valve 41 in the brine circuit to allow the remaining cold energy from the low-temperature zone to flow through the brine pipeline to the high-temperature zone for further cooling via the high-temperature zone cold storage plate 40; and closing the brine valve 41 when the high-temperature zone cold storage plate 40 reaches its cooling limit. Thereafter, if the low-temperature zone temperature is still higher than the peak electricity price temperature limit, the air cooler 20, the second liquid supply valve 21, and the liquid supply device 10 are opened. During the cooling process, the first liquid supply valve 31 remains closed.

[0067] The cooling stage of the cold storage plate is a phase transition from solid to liquid. When all the solid refrigerant is converted to liquid, the plate is considered to have reached its cooling limit and cooling is complete. The cooling status of the cold storage plate can be determined by measuring the liquid level or volume inside the plate.

[0068] In this embodiment, during the peak electricity price period, when the temperature in the low temperature zone does not meet the requirements, the cold storage plate is used for cooling first. At this time, the air cooler 20 and the liquid supply device 10 stop running and do not provide cooling. When the cold storage plate 30 in the low temperature zone reaches the cooling limit, if the temperature in the low temperature zone still does not meet the requirements, the air cooler 20 and the liquid supply device 10 are turned on to provide cooling; at the same time, the refrigerant valve 41 is opened to transport the remaining unused cold capacity of the cold storage plate in the low temperature zone to the high temperature zone through the refrigerant for continued cooling, so that the cold capacity can be fully utilized. This ensures that the cold storage plate stores cold during the valley electricity price period and cools during the peak electricity price period, thereby achieving energy saving, and the cold capacity of the cold storage plate that has finished cooling in the low temperature zone is transported to the high temperature zone for secondary cooling, thereby fully utilizing the cold capacity and eliminating the high-temperature refrigeration system, thereby achieving optimal system economy.

[0069] In one embodiment, the above method also includes: during the flat electricity price period, when the temperature in the low temperature zone is greater than the upper limit of the flat electricity price temperature, turning on the cold air blower 20, the second liquid supply valve 21 and the liquid supply device 10; when the temperature in the low temperature zone is less than or equal to the upper limit of the flat electricity price temperature, turning off the cold air blower 20, the second liquid supply valve 21 and the liquid supply device 10.

[0070] This embodiment monitors the temperature of the low temperature zone during the flat electricity price period, and controls the start and stop of the cooling fan 20 according to the temperature of the low temperature zone. During the flat electricity price period, the control of cold storage and cold release is not involved, thereby effectively utilizing peak and valley electricity prices to allocate cold capacity to achieve energy saving.

[0071] The refrigeration control method described above is described below with reference to a specific embodiment. However, it should be noted that this specific embodiment is only intended to better illustrate the present application and does not constitute an undue limitation on the present application. Explanations of terms that are identical or corresponding to those in the above embodiment will not be repeated in this embodiment.

[0072] like Figure 6 As shown in the figure, the refrigeration control process includes the following steps:

[0073] S601, the unit operates normally, that is, the liquid supply device 10, the air cooler 20 and the second liquid supply valve 21 are all opened, and the air cooler 20 provides cooling.

[0074] S602, determine whether it is currently in the flat electricity price period, if so, go to S603, if not, go to S606.

[0075] S603, monitoring the temperature T in the low temperature zone.

[0076] S604, determine whether T>the upper limit of the flat electricity price temperature is satisfied, if so, return to S601, if not, enter S605.

[0077] S605: The unit stops running, that is, the liquid supply device 10, the air cooler 20 and the second liquid supply valve 21 are all closed, and the air cooler 20 does not provide cooling. Return to S602 to continue determining the electricity price period.

[0078] S606, determine whether it is currently in the off-peak electricity price period, if so, proceed to S607, if not, proceed to S616.

[0079] S607: Keep the unit running normally, that is, the air cooler 20 continues to supply cooling.

[0080] S608, monitoring the temperature T in the low temperature zone.

[0081] S609, determine whether T>valley electricity price temperature upper limit is satisfied, if so, return to S607, if not, enter S610.

[0082] S610, judging whether the low temperature zone cold storage plate 30 has reached its cold storage upper limit, if so, proceeding to S612, if not, proceeding to S611.

[0083] S611, open the first liquid supply valve 31 to start cold storage.

[0084] S612, cold storage in the low temperature zone ends.

[0085] S613, if it is still the off-peak electricity price period, open the brine valve 41 of the brine circuit, and the brine transports the cold energy of the cold storage plate in the low-temperature area to the high-temperature area, and the first liquid supply valve 31 remains open.

[0086] S614, determine whether the high temperature area cold storage plate 40 has reached its cold storage upper limit, if so, proceed to S615, if not, return to S613 to continue cold storage.

[0087] S615, close the first liquid supply valve 31 and the brine valve 41 of the brine circuit, and the cold storage in the high temperature zone ends.

[0088] S616, determining that the current period is a peak electricity price period, and monitoring the temperature T in the low temperature area.

[0089] S617, determine whether T>peak electricity price temperature upper limit is satisfied, if so, go to S618, if not, go to S605.

[0090] In step S618, the low-temperature cold storage plate begins cooling, and the unit stops operating. Specifically, the liquid supply device 10, the air cooler 20, and the second liquid supply valve 21 are all closed, and the air cooler 20 stops providing cooling. If the high-temperature zone temperature exceeds the cooling temperature of the high-temperature zone cold storage plate, the high-temperature zone cold storage plate also cools.

[0091] S619, determine whether the low temperature zone cold storage plate 30 has reached its cooling limit, if so, proceed to S621, if not, proceed to S620.

[0092] S620: The cold storage plate in the low temperature area continues to cool, and the first liquid supply valve 31 remains closed.

[0093] S621, open the brine valve 41 of the brine circuit, and the brine transports the remaining cooling capacity of the cold storage plate in the low-temperature area to the high-temperature area.

[0094] S622, determine whether the high temperature area cold storage plate 40 has reached its cooling limit, if so, proceed to S624, if not, proceed to S623.

[0095] S623, the high temperature area cold storage plate 40 continues to cool.

[0096] S624, close the brine valve 41 of the brine circuit, and stop the flow of the brine circuit.

[0097] S625, monitoring the temperature T in the low temperature zone.

[0098] S626, determine whether T>peak electricity price temperature upper limit is satisfied, if so, go to S627, if not, go to S605.

[0099] S627, the liquid supply device 10, the air cooler 20 and the second liquid supply valve 21 are turned on, and the air cooler 20 provides cooling. The process can also return to S602 to continue determining the electricity price period.

[0100] This embodiment optimizes the structure and connection of the cold storage plate and controls the cold storage and release based on the electricity price period and the temperature of the low-temperature zone. It can fully utilize the cooling capacity of the refrigerant during peak and valley periods, reduce the start-up time of the unit, and the high-temperature zone can use the excess cooling capacity of the cold storage plate in the low-temperature zone, eliminating the high-temperature refrigeration system and achieving the best operating economy of the cold storage refrigeration system.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A refrigeration system, used in cold storage, characterized in that: The cold storage includes a low-temperature area and a high-temperature area, and the refrigeration system includes: A liquid supply device, used for compressing and condensing the refrigerant to output the refrigerant liquid; an air cooler located in the low-temperature zone and connected to the liquid supply device to form a refrigeration circuit; At least one low-temperature zone cold storage plate is installed on at least one shelf in the low-temperature zone in a one-to-one correspondence, and the low-temperature zone cold storage plate is connected to the liquid supply device to form a cold storage circuit; At least one high-temperature zone cold storage plate is installed in a one-to-one correspondence on at least one shelf in the high-temperature zone. The low-temperature zone cold storage plate is connected to the high-temperature zone cold storage plate through a coolant pipeline to form a coolant circuit. The cold energy of the low-temperature zone cold storage plate is delivered to the high-temperature zone cold storage plate through the coolant circuit for cold storage or cooling.

2. The refrigeration system according to claim 1, characterized in that In the coolant circuit, all cold storage plates in the low temperature zone are connected in sequence, and all cold storage plates in the high temperature zone are connected in sequence; or, All low-temperature zone cold storage plates are divided into at least two low-temperature cold storage groups, and all high-temperature zone cold storage plates are divided into at least two high-temperature cold storage groups. The low-temperature cold storage groups correspond to the high-temperature cold storage groups one by one. Any low-temperature cold storage group is connected to its corresponding high-temperature cold storage group to form a refrigerant loop. In this refrigerant loop, the low-temperature zone cold storage plates in the low-temperature cold storage group are connected in sequence, and the high-temperature zone cold storage plates in the high-temperature cold storage group are connected in sequence.

3. The refrigeration system according to claim 1, wherein: A driving pump is provided in the coolant circuit.

4. The refrigeration system according to claim 1, wherein: A coolant valve is provided on the coolant pipeline between any two directly connected low-temperature zone cold storage plates and high-temperature zone cold storage plates.

5. The refrigeration system according to claim 4, characterized in that The refrigerant valve is a one-way valve.

6. The refrigeration system according to claim 1, wherein: The low-temperature zone cold storage plate and the high-temperature zone cold storage plate both include a cold storage agent inlet, a cold storage agent outlet, a refrigerant inlet, a refrigerant outlet, a coolant inlet, and a coolant outlet.

7. The refrigeration system according to any one of claims 1 to 6, characterized in that: The low-temperature zone cold storage plate and the high-temperature zone cold storage plate both adopt phase change cold storage, and the solution ratio of the cold storage agent is configured according to the required cooling temperature and cold storage temperature.

8. The refrigeration system according to any one of claims 1 to 6, characterized in that: A first liquid supply valve is provided on a connecting pipeline between the outlet of the liquid supply device and the low-temperature zone cold storage plate.

9. The refrigeration system according to any one of claims 1 to 6, characterized in that: A second liquid supply valve is provided on the connecting pipeline between the outlet of the liquid supply device and the cold air blower.

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