Refrigeration device with coupling tank and control method

Abstract

The present invention provides a refrigeration device with a coupling tank and a control method, which solves the technical problem in the prior art that the flow rate of the industrial load cannot match the flow rate of the refrigerator, resulting in high energy consumption during system operation. The refrigeration device with a coupling tank provided by the present invention has a coupling tank connected to the refrigerator connected to the chilled water circulation pipeline. The coupling tank body is provided with four interfaces, namely a first interface, a second interface, a third interface, and a fourth interface. The second interface is connected to the water inlet of the evaporator through a first chilled water connecting line, and the third interface is connected to the water outlet of the evaporator through a second chilled water connecting line. The first interface on the coupling tank body is connected to the water inlet of the load device through a fourth chilled water connecting line, and the fourth interface is connected to the water outlet of the load device through a third chilled water connecting line. A control method is also provided. The device can be widely used in the fields of air conditioning and refrigeration technology.

Description

Technical Field

[0001] The present invention relates to the field of air conditioning and refrigeration, and in particular to a refrigeration device with a coupling tank and a control method thereof. Background Art

[0002] In industrial refrigeration systems, because the purpose of cooling differs from that of air conditioning, the load's response to the cooling load often exhibits different characteristics, such as smaller temperature differences and larger flow rates, or larger temperature differences and smaller flow rates. Generally, a primary pump system cannot be used in industrial refrigeration systems. For example, a water pump is responsible for both removing cooling energy from the chiller and distributing cooling energy to the industrial load. In such a system, the flow rate of the industrial load does not match the flow rate of the chiller, and the flow rate of the industrial load varies depending on the scenario. Therefore, a primary pump system cannot be used. Secondary pump systems are generally used in industrial refrigeration. There are generally two types of secondary pumps: an open water tank secondary system, which has the widest application range, and a closed secondary system.

[0003] These two systems have common problems. First, the system needs to be equipped with an additional small-flow water pump, which causes high energy consumption in the system operation. Second, the temperature difference on the primary side and the temperature difference on the secondary side cannot form an effective coupling. Regardless of the size of the load, the operating temperature difference of the refrigerator is smaller than the normal selected temperature difference (generally 5 degrees). Under normal working conditions, an effective temperature difference cannot be established, and thus normal loading operation cannot be achieved. Summary of the Invention

[0004] In view of the shortcomings and deficiencies in the prior art, the present invention provides a refrigeration device with a coupling tank, which has low operating power, low operating costs, low energy consumption, can maintain efficient operation, effective coupling, and achieve an energy saving rate of 30-60%.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: the refrigeration device with a coupling tank provided by the present invention includes a refrigerator, a chilled water circulation pipeline, a cooling water circulation pipeline, a chilled water main circulation pump, a load device and a controller. The refrigerator includes an evaporator and a condenser. The refrigerator is used to generate chilled water required by the terminal load device served by the refrigeration system. The controller is used to control the temperature set point of the refrigerator based on the detected cold load value. The chilled water circulation pipeline is also connected to a coupling tank connected to the refrigerator. The coupling tank body is provided with four interfaces, namely a first interface, a second interface, a third interface and a fourth interface. The second interface is connected to the water inlet of the evaporator through a first chilled water connecting pipeline, and the third interface is connected to the water outlet of the evaporator through a second chilled water connecting pipeline.

[0006] The first interface on the coupling tank body is connected to the water inlet end of the load device through the fourth chilled water connecting pipe, and the fourth interface is connected to the water outlet end of the load device through the third chilled water connecting pipe.

[0007] Preferably, an H connection point and an I connection point are respectively provided on the second chilled water connecting pipe and the fourth chilled water connecting pipe, and a fifth chilled water connecting pipe is connected between the H connection point and the I connection point.

[0008] Preferably, a small flow water pump is further connected between the H connection point and the third interface of the coupling tank on the second connecting pipeline of the chilled water.

[0009] Preferably, an electric regulating valve is also connected on the fourth connecting pipe of the chilled water, between the I connection point and the first interface of the coupling tank, and a chilled water main circulation pump is connected between the I connection point and the load equipment, which is used to provide the chilled water generated by the refrigerator to the terminal load equipment via the chilled water circulation pipeline.

[0010] Preferably, the electric regulating valve, the small flow water pump and the chilled water main circulation pump are all electrically connected to the controller.

[0011] Preferably, the coupling tank is provided with a second interface, a third interface and a fourth interface in sequence from top to bottom, and the first interface is provided at the lower part of the coupling tank;

[0012] The inner interfaces of the first interface, the second interface and the third interface located inside the coupling tank are all 45° bevel cuts. The bevel cuts of the first interface and the third interface are both set to open downward, and the bevel cut of the second interface is opened upward.

[0013] A control method for a refrigeration device with a coupling tank according to any one of the above items comprises the following steps:

[0014] During use, the coupling tank is filled with water, so that the temperature difference between the primary side and the secondary side of the refrigerator can form an effective coupling, as follows:

[0015] (1) Connect the small flow water pump through the third interface of the coupling tank to supplement the flow requirements of the chiller when the flow of the main circulation pump of the chilled water is too low;

[0016] (2) The first interface of the coupling tank bypasses the flow of the main circulation pump of chilled water. When the flow of the main circulation pump of chilled water is greater than the flow of the refrigerator, the flow is bypassed through the first interface of the coupling tank and supplemented to the water inlet pipe of the main circulation pump of chilled water to meet the flow demand of the main circulation pump of chilled water and ensure the stability of the flow on the refrigerator side.

[0017] Preferably, the method specifically includes the following steps:

[0018] When the load of the load device decreases and the flow rate of the chilled water main circulation pump decreases, becoming less than the requirement of the refrigerator, that is, the flow rate in the fourth connecting line is less than the flow rate in the second connecting line, the controller starts the low-flow water pump and closes the electric regulating valve. The third connecting line, the outlet line of the load device, is connected to the fourth interface of the coupling tank, and the flow rate in the third connecting line flows into the coupling tank. Through the coupling effect of the coupling tank, the third interface on the coupling tank is connected to the low-flow water pump, increasing the flow rate in the coupling tank. The increased flow rate also flows out of the second interface of the coupling tank. The flow rate out of the second interface of the coupling tank is equal to the sum of the water inlet flow rate of the fourth interface plus the water inlet flow rate of the third interface. After the flow rate in the third connecting line, the outlet line of the load device, is dynamically reduced by the coupling tank, it enters the refrigerator through the first connecting line to supplement the flow rate requirements of the refrigerator evaporator inlet and outlet. This replenishes the flow rate of the chilled water main circulation pump when it is too low to meet the flow requirement of the refrigerator.

[0019] Preferably, the method further comprises the following steps:

[0020] When the load of the load device increases and the flow rate of the main chilled water circulation pump increases, exceeding the flow rate requirement of the refrigerator, that is, when the flow rate on the fourth connecting pipe is greater than the flow rate on the second connecting pipe, the controller controls the activation of the electric regulating valve to close the small-flow water pump, and the third connecting pipe, the outlet pipe of the load device, is connected to the fourth interface of the coupling tank, so that the large flow rate in the third connecting pipe flows into the coupling tank. Through the coupling effect of the coupling tank, the first interface of the coupling tank is connected to the water inlet of the main chilled water circulation pump through the electric regulating valve, and the bypass backflow is returned through the first interface of the coupling tank to supplement the flow rate of the main chilled water circulation pump, thereby meeting the large flow rate requirement of the main chilled water circulation pump. At the same time, the flow rate flowing out of the second interface of the coupling tank is equal to the inlet flow rate of the fourth interface minus the outlet flow rate of the first interface. After the flow rate in the third connecting pipe, the outlet pipe of the load device, is dynamically increased through the coupling tank, it enters the refrigerator through the first connecting pipe, thereby meeting the flow rate requirement of the refrigerator and ensuring the flow stability on the refrigerator side.

[0021] Preferably, the following steps are also included: when the load of the load equipment, the flow of the main circulation pump of chilled water, and the flow of the refrigerator are balanced, that is, the flow on the fourth connecting pipe is equal to the flow on the second connecting pipe, the controller controls the closing of the electric regulating valve, the closing of the small-flow water pump, and the outlet pipe of the load equipment - the third connecting pipe is connected to the fourth interface of the coupling tank, and the flow on the third connecting pipe flows into the interior of the coupling tank. Through the coupling action of the coupling tank, the flow outflowing from the second interface of the coupling tank is equal to the water inlet flow of the fourth interface, and then enters the refrigerator from the first connecting pipe, thereby meeting the flow demand of the refrigerator and ensuring the stability of the flow on the refrigerator side.

[0022] The present invention provides a refrigeration device with a coupling tank. It has the following beneficial effects:

[0023] (1) The refrigeration device and control method with a coupling tank of the present invention can dynamically adjust the flow of the refrigerator in real time according to the flow of the industrial load while reducing energy consumption. The volume of the coupling tank itself is used to increase the water capacity of the refrigeration system. A form similar to a primary pump is used instead of a secondary pump. In actual operation, the operating power of the system is low, saving operating costs. The secondary system lacks a mixing water tank or a mixing water tank. The refrigerator can sense changes in the industrial load more quickly and can maintain an efficient operating state. The flow of the refrigerator is adjusted according to the flow of the load equipment while reducing energy consumption. The primary side temperature difference and the secondary side temperature difference can form an effective coupling to establish an effective temperature difference. The coupling tank system achieves an energy saving rate of 30% to 60%.

[0024] (2) In the refrigeration device with a coupling tank of the present invention, the inclined surface treatment of the first interface, the third interface and the second interface of the coupling tank guides the water flow to turn the lower water body upward and the upper water body downward respectively, thereby increasing the disturbance of the water in the coupling tank, making the water inside the coupling tank well mixed, ensuring the utilization rate of the coupling tank volume, and the refrigerator can sense the change of industrial load more quickly and maintain an efficient operating state.

[0025] (3) The refrigeration device and control method with a coupling tank of the present invention is used to connect a small flow water pump through the third interface of the coupling tank to increase the flow on the refrigerator side and supplement the situation where the flow of the main circulation pump of chilled water is too low to meet the flow requirement of the refrigerator; the first interface of the coupling tank is used to bypass the flow of the main circulation pump of chilled water to ensure the stability of the flow on the refrigerator side. When the flow of the main circulation pump of chilled water is greater than the flow of the refrigerator, the flow is bypassed and refluxed through the first interface to reduce the flow on the refrigerator side and meet the flow requirement of the refrigerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 for Figure 1 A structural diagram of a partially enlarged view in FIG.

[0028] Figure 3 It is a structural schematic diagram of the coupling tank of the present invention;

[0029] Figure 4 for Figure 3 Structural diagram of the top view;

[0030] Figure 5 for Figure 4 The structural diagram of the cross-sectional view at AA in the middle;

[0031] Figure 6 for Figure 3 Structural diagram of the right view;

[0032] Figure 7 Schematic diagram of the process of using the embodiment of the present invention.

[0033] In the figure: 1. Refrigerator, 2. Load equipment, 3. Coupling tank, 4. First interface, 5. Second interface, 6. Third interface, 7. Fourth interface, 8. First connecting pipe, 9. Evaporator, 10. Condenser, 11. Second connecting pipe, 12. Third connecting pipe, 13. Fourth connecting pipe, 14. Fifth connecting pipe, 15. Small flow water pump, 16. Chilled water main circulation pump, 17. Electric regulating valve. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] In the present invention, unless otherwise expressly specified or limited, the terms "connection" and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0036] See also Figure 1-7 , the present invention provides a technical solution:

[0037] The refrigeration system with a coupling tank provided by the present invention includes a chiller 1, chilled water circulation piping, cooling water circulation piping, a chilled water main circulation pump 16, a load device 2, and a controller. The chiller 1 includes an evaporator 9 and a condenser 10 and is used to generate chilled water for the terminal load device 2 served by the refrigeration system. The controller is used to control the temperature set point of the chiller 1 based on a detected cooling load value. An electric regulating valve 17, a low-flow water pump 15, and the chilled water main circulation pump 16 are all electrically connected to the controller.

[0038] The chilled water circulation pipeline located on the chilled water side of the refrigerator 1 is connected to the refrigerator 1, the chilled water main circulation pump 16 and the terminal load device 2; the chilled water main circulation pump 16 is used to provide the chilled water generated by the refrigerator 1 to the terminal load device 2 via the chilled water circulation pipeline.

[0039] The chilled water circulation pipeline of the refrigeration device of the present invention also includes a coupling tank 3 connected to the refrigerator 1. During use, the interior of the coupling tank 3 is filled with water. There are four interfaces on the tank body of the coupling tank 3, namely the first interface 4, the second interface 5, the third interface 6 and the fourth interface 7. The second interface 5 is connected to the water inlet end of the evaporator 9 through the first chilled water connecting pipe 8, and the third interface 6 is connected to the water outlet end of the evaporator 9 through the second chilled water connecting pipe 11.

[0040] The first interface 4 on the coupling tank 3 is connected to the water inlet end of the load device 2 through the fourth chilled water connecting pipe 13 , and the fourth interface 7 is connected to the water outlet end of the load device 2 through the third chilled water connecting pipe 12 .

[0041] The second chilled water connecting line 11 and the fourth chilled water connecting line 13 are respectively provided with an H connection point and an I connection point. A fifth chilled water connecting line 14 is connected between the H connection point and the I connection point. A low-flow water pump 15 is also connected to the second chilled water connecting line 11, between the H connection point and the third port 6 of the coupling tank. The low-flow water pump 15 is connected through the third port 6 of the coupling tank to supplement the flow rate of the main chilled water circulation pump 16 when the flow rate is too low to meet the flow rate requirements of the refrigerator 1.

[0042] An electric regulating valve 17 is also connected between the fourth chilled water connecting line 13, connecting point I, and the first interface 4 of the coupling tank. A chilled water main circulation pump 16 is connected between point I and the load device 2, supplying chilled water generated by the chiller 1 to the terminal load device 2 via the chilled water circulation pipeline. The electric regulating valve 17, low-flow pump 15, and main chilled water circulation pump 16 are all electrically connected to the controller. The first interface 4 of the coupling tank bypasses the flow of the main chilled water circulation pump 16 to ensure stable flow on the chiller 1 side. When the flow of the main chilled water circulation pump 16 exceeds that of the chiller 1, the flow is bypassed through the first interface 4, reducing the flow on the chiller 1 side to meet the flow requirements of the chiller 1.

[0043] This structural design of the refrigeration device fully utilizes the volume of coupling tank 3 to increase the water capacity of the refrigeration system. The coupling effect of coupling tank 3 dynamically adjusts the chilled water flow rate of chiller 1 according to the flow rate demanded by load equipment 2. The presence of coupling tank 3 on the chilled water side effectively couples the primary and secondary temperature differences, establishing an effective temperature differential and significantly reducing energy consumption, achieving energy savings of 30% to 60%.

[0044] The coupling tank 3 is provided with a second interface 5, a third interface 6 and a fourth interface 7 from top to bottom. The first interface 4 is provided at the lower part of the coupling tank 3. The inner interfaces of the first interface 4, the second interface 5 and the third interface 6 inside the coupling tank are all 45° bevel cuts. The bevel cuts of the first interface 4 and the third interface 6 are both opened downward, and the bevel cut of the second interface 5 is opened upward. The bevel cuts of this structural design can guide the water flow to flow in given directions: the lower water body turns upward and the upper water body turns downward, which can more effectively alleviate the uniform distribution of water in the coupling tank 3, increase the disturbance of the water in the coupling tank 3, and achieve good mixing of the water body inside the coupling tank 3, thereby ensuring the utilization rate of the internal volume of the coupling tank 3.

[0045] The control method of the refrigeration device with a coupling tank of the present invention comprises the following steps:

[0046] In the refrigeration device with a coupling tank of the present invention, the coupling tank 3 is filled with water during use, so that the temperature difference between the primary side and the secondary side of the refrigerator 1 can be effectively coupled, as follows:

[0047] (1) Connecting the low-flow water pump 15 through the third interface 6 of the coupling tank 3 to supplement the flow requirement of the chiller 1 when the flow of the chilled water main circulation pump 16 is too low;

[0048] (2) The first interface 4 of the coupling tank 3 bypasses the flow of the chilled water main circulation pump 16. When the flow of the chilled water main circulation pump 16 is greater than the flow of the refrigerator 1, the flow is bypassed through the first interface 4 of the coupling tank 3 and supplemented to the water inlet pipe of the chilled water main circulation pump 16 to meet the flow demand of the chilled water main circulation pump 16 and ensure the stability of the flow on the refrigerator 1 side.

[0049] The specific steps include:

[0050] When the load of the load device 2 decreases and the flow rate of the chilled water main circulation pump 16 decreases, which is less than the requirement of the refrigerator 1, that is, the flow rate on the fourth connecting pipe 13 is less than the flow rate on the second connecting pipe 11, the controller controls to start the small flow water pump 15, closes the electric regulating valve 17, and the water outlet pipe of the load device 2 - the third connecting pipe 12 is connected to the fourth interface 7 of the coupling tank 3, and the flow rate on the third connecting pipe 12 flows into the coupling tank 3. Through the coupling effect of the coupling tank 3: the third interface 6 on the coupling tank 3 is connected to the small flow water pump 15 The flow rate in the coupling tank 3 is increased, and the increased flow rate also flows out from the second interface 5 of the coupling tank 3. The flow rate flowing out of the second interface 5 of the coupling tank 3 is equal to the sum of the water inlet flow rate of the fourth interface 7 and the water inlet flow rate of the third interface 6. The flow rate on the water outlet pipeline of the load device 2 - the third connecting pipeline 12 is dynamically reduced through the coupling tank 3, and then enters the refrigerator 1 from the first connecting pipeline 8, and is coupled to supplement the flow rate requirements of the water inlet and outlet of the evaporator 9 of the refrigerator 1, and to supplement the situation where the flow rate of the chilled water main circulation pump 16 is too low to meet the flow requirement of the refrigerator 1.

[0051] When the load of the load device 2 increases and the flow rate of the chilled water main circulation pump 16 increases, exceeding the flow rate requirement of the refrigerator 1, that is, the flow rate on the fourth connecting pipe 13 is greater than the flow rate on the second connecting pipe 11, the controller controls to start the electric regulating valve 17, close the small flow water pump 15, and the water outlet pipe of the load device 2 - the third connecting pipe 12 is connected to the fourth interface 7 of the coupling tank 3, and the large flow rate on the third connecting pipe 12 flows into the interior of the coupling tank 3. Through the coupling effect of the coupling tank 3: the first interface 4 of the coupling tank 3 is connected to the chilled water through the electric regulating valve 17. The water inlet of the main circulation pump 16 is connected, and the bypass reflux is passed through the first interface 4 of the coupling tank 3 to supplement the flow of the chilled water main circulation pump 16, thereby meeting the large flow requirement of the chilled water main circulation pump 16. At the same time, the flow rate flowing out of the second interface 5 of the coupling tank 3 is equal to the water inlet flow of the fourth interface 7 minus the water outlet flow of the first interface 4. The flow rate on the water outlet pipeline of the load device 2 - the third connecting pipeline 12 is dynamically increased through the coupling tank 3, and then enters the refrigerator 1 from the first connecting pipeline 8, thereby meeting the flow requirement of the refrigerator 1 and ensuring the stability of the flow rate on the refrigerator 1 side.

[0052] When the load of the load device 2 and the flow of the chilled water main circulation pump are balanced with the flow of the refrigerator 1, that is, the flow on the fourth connecting pipe 13 is equal to the flow on the second connecting pipe 11, the controller controls to close the electric regulating valve 17 and the small-flow water pump 15, and the outlet pipe of the load device 2 - the third connecting pipe 12 is connected to the fourth interface 7 of the coupling tank 3, and the flow on the third connecting pipe 12 flows into the coupling tank 3. Through the coupling effect of the coupling tank 3, the flow out of the second interface 5 of the coupling tank 3 is equal to the water inlet flow of the fourth interface 7, and then enters the refrigerator 1 from the first connecting pipe 8, thereby meeting the flow demand of the refrigerator 1 and ensuring the stability of the flow on the refrigerator 1 side.

[0053] The refrigeration unit with a coupling tank of the present invention first increases the water capacity of the refrigeration system due to the volume of the coupling tank 3 itself. The "coupling tank system" combines the advantages of a secondary pump system while compensating for the shortcomings of a primary pump, enabling it to handle dynamic load flow fluctuations over a wider range. The inclined opening orientation, synergistically designed with the "coupling tank system," ensures efficient utilization of the coupling tank's volume and enables the coupling tank to effectively and dynamically regulate the water flow on both the primary and secondary sides of the chilled water side of the entire refrigeration unit in real time.

[0054] For traditional secondary pump systems, the secondary pump adjusts the flow rate according to the load changes of the load device 2, while the primary pump always runs at a fixed frequency, resulting in high energy consumption of the system. In addition, the temperature difference on the primary side and the temperature difference on the secondary side cannot form an effective coupling. Regardless of the size of the load, the operating temperature difference of the refrigerator 1 is smaller than the normal selected temperature difference (generally 5 degrees). Under normal working conditions, an effective temperature difference cannot be established, and thus normal loading operation cannot be achieved.

[0055] The control method of the coupling tank system of the present invention is quite different from the prior art. Figure 7 As shown, in the control method of the coupling tank system of the present invention, the chilled water main circulation pump 16 on the chilled water circulation pipeline and the demand of the terminal load device 2 are dynamically coupled and linked through the coupling tank. According to the actual load size of the load device 2, when the load of the load device increases, the flow rate on the chilled water circulation pipeline increases, and when the load of the load device decreases, the flow rate on the chilled water circulation pipeline decreases. The secondary side water flow rate is adjusted dynamically in time to meet the actual demand. At the same time, the water flow demand on the side of the chiller 1 is met through dynamic coupling of the coupling tank. Under normal working conditions, an effective temperature difference can be established, thereby enabling normal load operation and significantly reducing energy consumption. The coupling tank system solves two major problems existing in the secondary pump system: one is high energy consumption, and the other is the inefficient operation of the chiller 1 caused by the mixing of water between the primary and secondary pumps.

[0056] Compared with the prior art, the present invention has the following advantages:

[0057] 1. Using a similar primary pump to replace the secondary pump, the system has low operating power in actual operation, saving operating costs.

[0058] 2. Compared with the existing technology, the secondary system of the mixing water tank or mixing water tank is reduced, and the refrigerator can sense the changes in industrial load more quickly and maintain an efficient operating state.

[0059] The "coupling tank system" adopted in the present invention not only solves the problems existing in the secondary pump system, but also has the advantages of the primary pump system. Through the statistics of actual application energy consumption data, it is found that compared with the energy consumption data of the secondary water pump system in the actual use process in the prior art, the "coupling tank system" adopted in the scheme of the present invention can achieve an energy saving rate of 30% to 60%.

[0060] In summary, the refrigeration device with a coupling tank of the present invention utilizes the volume of the coupling tank 3 itself to increase the water capacity of the refrigeration system, and uses a form similar to a primary pump instead of a secondary pump. In actual operation, the operating power of the system is low, saving operating costs. The secondary system lacks a mixing water tank or a mixing water tank. The refrigerator 1 can sense changes in industrial loads more quickly and maintain an efficient operating state. The flow of the refrigerator 1 is adjusted according to the flow of the load equipment 2 while reducing energy consumption. The temperature difference on the primary side and the temperature difference on the secondary side can form an effective coupling to establish an effective temperature difference. The coupling tank system achieves an energy saving rate of 30% to 60%.

[0061] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. For example, the bevel opening directions of the first interface 4, the second interface 5, and the third interface 6 and the positions of the interfaces on the coupling tank 3 can be selected according to actual conditions. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and inventive concept of the present invention within the technical scope disclosed by the present invention, and they should be covered by the scope of protection of the present invention.

Claims

1. A refrigeration device with a coupling tank, comprising a chiller, a chilled water circulation pipeline, a cooling water circulation pipeline, a chilled water main circulation pump, a load device, and a controller, wherein the chiller includes an evaporator and a condenser, and is used to generate chilled water required by the terminal load device served by the refrigeration system; the controller is used to control the temperature set point of the chiller based on a detected cooling load value; characterized in that: The chilled water circulation pipeline is further connected to a coupling tank connected to the refrigerator, and the coupling tank body is provided with four interfaces, namely a first interface, a second interface, a third interface and a fourth interface. The second interface is connected to the water inlet of the evaporator through the first chilled water connecting pipe, and the third interface is connected to the water outlet of the evaporator through the second chilled water connecting pipe; The first interface on the coupling tank body is connected to the water inlet end of the load device through the fourth chilled water connecting pipe, and the fourth interface is connected to the water outlet end of the load device through the third chilled water connecting pipe; The second chilled water connecting pipe and the fourth chilled water connecting pipe are respectively provided with an H connection point and an I connection point, and a fifth chilled water connecting pipe is connected between the H connection point and the I connection point; A small flow water pump is also connected between the H connection point and the third interface of the coupling tank on the second connecting pipe of the chilled water; An electric regulating valve is further connected on the fourth connecting pipe of the chilled water, between the I connection point and the first interface of the coupling tank, and a chilled water main circulation pump is connected between the I connection point and the load device, for supplying the chilled water generated by the refrigerator to the terminal load device via the chilled water circulation pipe; The coupling tank is provided with a second interface, a third interface and a fourth interface in sequence from top to bottom, and the first interface is provided at the lower part of the coupling tank; The inner interfaces of the first interface, the second interface and the third interface inside the coupling tank are all 45° bevel cuts. The bevel cuts of the first interface and the third interface are both set to open downward, and the bevel cut of the second interface is opened upward.

2. A refrigeration device with a coupling tank according to claim 1, characterized in that: The electric regulating valve, the small flow water pump and the chilled water main circulation pump are all electrically connected to the controller.

3. The control method of a refrigeration device with a coupling tank according to any one of claims 1 to 2, characterized in that: The following steps are involved: During use, the coupling tank is filled with water, so that the temperature difference between the primary side and the secondary side of the refrigerator are effectively coupled, as follows: (1) Connecting the low-flow water pump through the third interface of the coupling tank to supplement the flow requirements of the refrigeration machine when the flow of the main circulation pump of the chilled water is too low; (2) The first interface of the coupling tank bypasses the flow of the main circulation pump of chilled water. When the flow of the main circulation pump of chilled water is greater than the flow of the refrigerator, the flow is bypassed through the first interface of the coupling tank and supplemented to the water inlet pipe of the main circulation pump of chilled water to meet the flow demand of the main circulation pump of chilled water and ensure the stability of the flow on the refrigerator side.

4. The control method of a refrigeration device with a coupling tank according to claim 3, characterized in that: The specific steps include: When the load of the load device decreases and the flow rate of the chilled water main circulation pump decreases, becoming less than the requirement of the refrigerator, that is, the flow rate in the fourth connecting line is less than the flow rate in the second connecting line, the controller starts the low-flow water pump and closes the electric regulating valve. The third connecting line, the outlet line of the load device, is connected to the fourth interface of the coupling tank, and the flow rate in the third connecting line flows into the coupling tank. Through the coupling effect of the coupling tank, the third interface on the coupling tank is connected to the low-flow water pump, increasing the flow rate in the coupling tank. The increased flow rate also flows out of the second interface of the coupling tank. The flow rate out of the second interface of the coupling tank is equal to the sum of the water inlet flow rate of the fourth interface plus the water inlet flow rate of the third interface. After the flow rate in the third connecting line, the outlet line of the load device, is dynamically reduced by the coupling tank, it enters the refrigerator through the first connecting line to supplement the flow rate requirements of the refrigerator evaporator inlet and outlet. This replenishes the flow rate of the chilled water main circulation pump when it is too low to meet the flow requirement of the refrigerator.

5. The control method of a refrigeration device with a coupling tank according to claim 3, characterized in that: The following steps are also included: When the load of the load device increases and the flow rate of the main chilled water circulation pump increases, exceeding the flow rate requirement of the refrigerator, that is, when the flow rate on the fourth connecting pipe is greater than the flow rate on the second connecting pipe, the controller controls the activation of the electric regulating valve to close the small-flow water pump, and the third connecting pipe, the outlet pipe of the load device, is connected to the fourth interface of the coupling tank, so that the large flow rate in the third connecting pipe flows into the coupling tank. Through the coupling effect of the coupling tank, the first interface of the coupling tank is connected to the water inlet of the main chilled water circulation pump through the electric regulating valve, and the bypass backflow is returned through the first interface of the coupling tank to supplement the flow rate of the main chilled water circulation pump, thereby meeting the large flow rate requirement of the main chilled water circulation pump. At the same time, the flow rate flowing out of the second interface of the coupling tank is equal to the inlet flow rate of the fourth interface minus the outlet flow rate of the first interface. After the flow rate in the third connecting pipe, the outlet pipe of the load device, is dynamically increased through the coupling tank, it enters the refrigerator through the first connecting pipe, thereby meeting the flow rate requirement of the refrigerator and ensuring the flow stability on the refrigerator side.

6. The control method of a refrigeration device with a coupling tank according to claim 3, characterized in that: The following steps are also included: When the load of the load equipment, the flow of the main circulation pump of chilled water, and the flow of the refrigerator are balanced, that is, the flow on the fourth connecting pipe is equal to the flow on the second connecting pipe, the controller controls to close the electric regulating valve, turn off the small-flow water pump, and the outlet pipe of the load equipment - the third connecting pipe is connected to the fourth interface of the coupling tank, and the flow on the third connecting pipe flows into the coupling tank. Through the coupling effect of the coupling tank, the flow out of the second interface of the coupling tank is equal to the water inlet flow of the fourth interface, and then enters the refrigerator from the first connecting pipe, meeting the flow demand of the refrigerator and ensuring the stability of the flow on the refrigerator side.

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