Centrifugal pump anti-freezing device and water circulating cooling system using the same
By installing a reflux assembly in the centrifugal pump and using the pressure difference to reflux the fluid, the problem of centrifugal pump impeller freezing is solved, achieving a simple and efficient anti-freezing effect and avoiding complex insulation or heating systems.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG SHUANGLUN
- Filing Date
- 2025-06-12
- Publication Date
- 2026-05-29
Smart Images
Figure CN224301067U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the technical field of water circulation cooling systems, and more specifically, relates to centrifugal pump antifreeze device and water circulation cooling system using the same. Background Technology
[0002] The circulating water system in petrochemical plants is a crucial device for cooling petrochemical equipment. Centrifugal pumps, as the key core equipment of the circulating water system, are the power source for the entire system. In the entire water circulation system, the cooling pool is a low-pressure fluid chamber with lower pressure, while the equipment end is a high-pressure fluid chamber with internal pressure higher than that of the cooling pool. The centrifugal pump is responsible for pumping the cooled water from the cooling pool to the equipment end, then to the cooling tower for further cooling, and finally back to the cooling water pool, thus circulating the water to exchange heat and cool the working equipment.
[0003] In certain application scenarios, such as equipment maintenance or when the ambient temperature drops to a point where cooling is no longer required by the water circulation system, centrifugal pumps may be shut down for extended periods. Alternatively, for equipment reliability, some water circulation systems may have a backup centrifugal pump circuit, which is also shut down for extended periods during normal operation. For centrifugal pumps in these shutdown states, residual cooling water can freeze the impeller in cold weather, potentially causing the pump to be difficult to start or even cracking and becoming damaged. To insulate the centrifugal pump and prevent freezing, existing technologies use insulated enclosures or separate heating systems to maintain the internal temperature, but these solutions are complex and costly. Summary of the Invention
[0004] To address the shortcomings of existing technologies, this application provides a centrifugal pump antifreeze device and a water circulation cooling system using the same. The device ensures that the fluid in the valve chamber is always in a flowing state through the return fluid, thus preventing the impeller from freezing and making it difficult to start.
[0005] To achieve the above objectives, the technical solution of this application provides a centrifugal pump antifreeze device, including a centrifugal pump, a low-pressure fluid chamber, and a high-pressure fluid chamber. The centrifugal pump has a valve body, which has a valve cavity, an inlet end, and an outlet end. An impeller is located inside the valve cavity. The inlet end is connected to the low-pressure fluid chamber, and the outlet end is connected to the high-pressure fluid chamber. An outlet valve is installed between the outlet end and the high-pressure fluid chamber. The device also includes a reflux assembly, which includes a control valve, a first reflux pipe, and a second reflux pipe. The inlet of the control valve is connected to the high-pressure fluid chamber through the first reflux pipe, and the outlet of the control valve is connected to the outlet end through the second reflux pipe.
[0006] During normal operation, the outlet valve is open and the control valve is closed, allowing the centrifugal pump to pump fluid from the low-pressure fluid chamber into the high-pressure fluid chamber. In low-temperature environments and after the centrifugal pump stops, the outlet valve closes and the control valve opens. The fluid in the high-pressure fluid chamber, under its own pressure, flows sequentially through return pipe one, the control valve, and return pipe two, then returns to the valve chamber through the outlet end, and finally flows back to the low-pressure fluid chamber from the inlet end. The returning fluid remains in a flowing state within the valve chamber, preventing the impeller from freezing and becoming difficult to start due to shutdown. The returning fluid does not require additional power equipment; it flows automatically under the pressure difference between the high-pressure and low-pressure fluid chambers. The entire centrifugal pump anti-freeze device has a simple structure, requiring no complex insulation or heating system, making it highly practical.
[0007] Optionally, the system also includes an outlet connecting pipe, on which an outlet valve is installed. The outlet connecting pipe is divided into two sections by the outlet valve: section one connects to the high-pressure fluid chamber, and section two connects to the outlet end. The end of return pipe one furthest from the control valve connects to section one, and the end of return pipe two furthest from the control valve connects to section two. Both the outlet valve and the return assembly are connected to the outlet connecting pipe, allowing it to be used as a single unit. This facilitates production and installation between the existing high-pressure fluid chamber and the outlet end of the centrifugal pump, simplifying the retrofitting of existing equipment. The outlet connecting pipe can be bent to form different orientations as needed, enhancing its adaptability.
[0008] Optionally, a check valve is also installed on the outlet connecting pipe, located between the outlet valve and the return pipe connected to the outlet connecting pipe. During the operation of the centrifugal pump, the check valve can prevent backflow, and the check valve will not affect the backflow of fluid along the return assembly when the pump is stopped.
[0009] Optionally, it also includes an inlet connecting pipe, through which the low-pressure fluid chamber is connected to the outlet end, and an inlet valve is installed in the middle of the inlet connecting pipe to realize the on-off control between the centrifugal pump and the low-pressure fluid chamber.
[0010] Optionally, it also includes expansion joint one, reducer one, expansion joint two, and reducer two. The outlet end is connected to pipe section two through reducer one and expansion joint one in sequence, and the inlet end is connected to inlet connecting pipe through reducer two and expansion joint two in sequence. In environments with large temperature variations, expansion joint one and expansion joint two can compensate for additional stress caused by temperature changes or external vibrations.
[0011] A water circulation cooling system employing the centrifugal pump antifreeze device described in any one of the above-mentioned embodiments includes a cooling pipe, a cooling tower, and a cooling pool. The cooling pipe serves as the high-pressure fluid chamber, the cooling pool serves as the low-pressure fluid chamber, the end of the cooling pipe away from the centrifugal pump is connected to the inlet of the cooling tower, and the outlet of the cooling tower is connected to the cooling pool.
[0012] The cooling pipes are wrapped around the outside of the equipment requiring cooling. During system operation, the outlet valve opens, the control valve closes, and the centrifugal pump pumps cooling water from the cooling pool into the cooling pipes to cool the equipment. After absorbing heat and increasing in temperature, the cooling water is cooled by the cooling tower and then flows back to the cooling pool, completing one cycle. The pressure inside the cooling pipes is greater than the pressure inside the cooling pool. When the centrifugal pump stops at cold temperatures, the outlet valve closes, and the control valve opens. The high-pressure fluid in the cooling pipes flows back into the valve chamber along the return assembly under the pressure difference, keeping the water in the valve chamber constantly flowing and preventing it from freezing, thus avoiding the centrifugal pump's inability to start due to icing.
[0013] Optionally, the outlet valve, centrifugal pump, and reflux assembly are combined to form a flow unit. Several sets of flow units are connected in parallel between the cooling pipe and the cooling pool. Some flow units, as the main operating units, are always open, while the remaining flow units, as backup units, are generally not operated. For the backup units, their outlet valves are always closed under normal operation, while the control valves are open, ensuring constant fluid reflux during normal operation to prevent icing in the valve chamber and avoid the backup unit becoming difficult to start due to prolonged inactivity. When the main operating unit needs to be shut down due to a fault, the backup unit's control valve closes and its outlet valve opens, and the centrifugal pump starts operating to replace the main operating unit. During troubleshooting, the main operating unit closes its outlet valve and opens its control valve, ensuring constant fluid flow in the valve chamber of the centrifugal pump within the main operating unit, further reducing the risk of icing during maintenance and troubleshooting. Because some flow units are always operating, the pressure in the high-pressure fluid chamber remains higher than that in the low-pressure fluid chamber, ensuring that the reflux fluid continuously drives the impeller in the non-operating centrifugal pump under the pressure difference.
[0014] The advantages of the technical solution in this application compared to the prior art are as follows:
[0015] During normal operation, the centrifugal pump pumps fluid from the low-pressure fluid chamber into the high-pressure fluid chamber. In low-temperature environments and after the centrifugal pump stops, the fluid in the high-pressure fluid chamber, under its own pressure, flows sequentially through return pipe one, the control valve, and return pipe two, then flows back to the valve chamber through the outlet end, ensuring the fluid in the valve chamber remains in a flowing state, and finally flows back to the low-pressure fluid chamber from the inlet end. Since flowing fluid is less likely to freeze than stationary fluid, it reduces the risk of the impeller freezing due to shutdown. The reverse-flowing fluid does not require additional power equipment; it flows automatically under the pressure difference between the high-pressure and low-pressure fluid chambers. The entire centrifugal pump anti-freeze device has a simple structure, requires no complex insulation or heating system, and is highly practical. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 A schematic diagram of the overall structure of the antifreeze device for a centrifugal pump;
[0018] Figure 2 This is a schematic diagram of the centrifugal pump's interconnection structure.
[0019] Figure 3 This is a schematic diagram of the overall structure of the water circulation cooling system.
[0020] Icons: 1. Centrifugal pump; 11. Valve body; 12. Inlet end; 13. Outlet end; 21. Low-pressure fluid chamber; 22. High-pressure fluid chamber; 31. Outlet valve; 32. Check valve; 33. Inlet valve; 41. Control valve; 42. Return pipe one; 43. Return pipe two; 5. Outlet connecting pipe; 51. Pipe section one; 52. Pipe section two; 6. Inlet connecting pipe; 71. Expansion joint one; 72. Reducer one; 73. Expansion joint two; 74. Reducer two; 81. Cooling pipe; 82. Cooling tower; 83. Cooling pool; 84. Main operating unit; 85. Standby unit. Detailed Implementation
[0021] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.
[0022] Example 1:
[0023] This embodiment provides a centrifugal pump antifreeze device, based on... Figure 1 and Figure 2 As shown, the system includes a centrifugal pump 1, a low-pressure fluid chamber 21, and a high-pressure fluid chamber 22. The centrifugal pump 1 has a valve body 11, which has a valve chamber, an inlet end 12, and an outlet end 13. An impeller is located within the valve chamber. The inlet end 12 communicates with the low-pressure fluid chamber 21, and the outlet end 13 communicates with the high-pressure fluid chamber 22. The internal pressure of the high-pressure fluid chamber 22 is greater than the internal pressure of the low-pressure fluid chamber 21. After the centrifugal pump 1 starts, it can pump liquid from the low-pressure fluid chamber 21 into the high-pressure fluid chamber 22. An outlet valve 31 is installed between the outlet end 13 and the high-pressure fluid chamber 22. The outlet valve 31 is open when the centrifugal pump 1 is operating normally. When the centrifugal pump 1 stops, the outlet valve 31 is closed to isolate the low-pressure fluid chamber 21 and the high-pressure fluid chamber 22, preventing backflow of liquid due to the pressure difference.
[0024] When centrifugal pump 1 stops, if low temperatures occur, the residual liquid inside the valve chamber may freeze and seal the impeller. Therefore, in addition to the above structure, a reflux assembly is also provided. The reflux assembly includes a control valve 41, a first reflux pipe 42, and a second reflux pipe 43. The inlet of control valve 41 is connected to the high-pressure fluid chamber 22 through the first reflux pipe 42, and the outlet of control valve 41 is connected to the outlet end 13 through the second reflux pipe 43. When centrifugal pump 1 is running normally, the outlet valve 31 is open, the control valve 41 is closed, and the first reflux pipe 42 and the second reflux pipe 43 are blocked. Centrifugal pump 1 pumps the fluid in the low-pressure fluid chamber 21 into the high-pressure fluid chamber 22. When the ambient temperature is higher than the freezing temperature, control valve 41 remains closed regardless of whether centrifugal pump 1 is stopped. When the ambient temperature is below the freezing point and centrifugal pump 1 stops, outlet valve 31 closes and control valve 41 opens. Under the influence of the pressure difference, the fluid in high-pressure fluid chamber 22 flows sequentially through return pipe 1 42, control valve 41, and return pipe 2 43, before returning to the valve chamber through outlet end 13. Due to the gap between the impeller and the inner wall of the valve chamber, the returning fluid passes through the gap between the valve chamber wall and the impeller and eventually flows back to low-pressure fluid chamber 21 from inlet end 12, ensuring that the returning fluid remains in a flowing state within the valve chamber.
[0025] Because the fluid returning to the valve chamber is always in a flowing state within it, and at the same temperature, flowing fluid is less likely to freeze than stagnant fluid, this reduces the likelihood of the impeller being unable to start due to freezing during shutdown. The return flow rate is set to ensure the valve chamber does not freeze, i.e., a low flow rate. In actual use, the return flow rate generally does not exceed 3% of the rated flow rate of centrifugal pump 1. Specifically, in this embodiment, the rated flow rate Q is 10000 m³ / h. 3 Taking a large centrifugal pump 1 with a head H of 50 meters and an impeller diameter of 0.91 meters as an example, the pressure in the high-pressure fluid chamber 22 is the pressure of 50 meters of water column, and the pressure in the low-pressure fluid chamber 21 is atmospheric pressure. For the centrifugal pump antifreeze device, ignoring friction loss and local resistance loss, only 1.38% of the rated flow rate Q is needed to ensure that the impeller is not frozen in an environment with a temperature not lower than -5 degrees Celsius. The small return flow rate will not affect the pressure distribution of the entire system. The lower the ambient temperature, the larger the required return flow rate. To adapt to different low-temperature environments, the control valve 41 can be an adjustable flow valve to control the return flow rate, ensuring that the return flow rate is kept at the minimum value to prevent the impeller from freezing. The control valve 41 can be manually switched or remotely controlled by a control device such as a PLC controller. The centrifugal pump antifreeze device in this embodiment has a simple structure and can be applied to single-suction or double-suction pumps. It can prevent the impeller from freezing in low-temperature environments without the need for a complex insulation room or heating system, making it highly practical.
[0026] For the large centrifugal pump 1 in this embodiment, the moment of inertia of its impeller can reach 192 kg·m 2 , and the moment of inertia of the rotating components in the motor supporting the centrifugal pump 1 can reach 367 kg·m 2 , the force exerted by the reflux fluid on the impeller is much smaller than the force required for the rotation of the impeller and the rotating components of the motor. The impeller in the centrifugal pump 1 will not rotate under the push of the reflux fluid, and the flow of the reflux fluid itself can keep the valve cavity from freezing.
[0027] Furthermore, it further includes an outlet connecting pipe 5. The outlet connecting pipe 5 serves as a connecting component between the outlet end 13 of the centrifugal pump 1 and the high-pressure fluid chamber 22. The outlet valve 31 is installed on the outlet connecting pipe 5, and the outlet connecting pipe 5 is divided into a first pipe segment 51 and a second pipe segment 52 by the outlet valve 31. The first pipe segment 51 is connected to the high-pressure fluid chamber 22, and the second pipe segment 52 is connected to the outlet end 13. The end of the first reflux pipe 42 far from the control valve 41 is connected to the first pipe segment 51, and the end of the second reflux pipe 43 far from the control valve 41 is connected to the second pipe segment 52. In this way, both the outlet valve 31 and the reflux assembly are connected to the outlet connecting pipe 5, which can be produced and used as an integral component, facilitating production and being easily installed between the existing high-pressure fluid chamber 22 and the outlet end 13 of the centrifugal pump 1, facilitating the modification of existing equipment. The outlet connecting pipe 5 can be bent according to requirements to form different orientations, with stronger adaptability.
[0028] Furthermore, a check valve 32 is installed on the outlet connecting pipe 5. The check valve 32 is located between the outlet valve 31 and the connection point of the return pipe 43 and the outlet connecting pipe 5. During normal operation of the centrifugal pump 1, the check valve 32 can prevent the backflow of fluid pumped into the high-pressure fluid chamber 22, and the position of the check valve 32 will not affect the backflow of fluid along the return assembly when the pump stops. An inlet connecting pipe 6 is also included. The inlet connecting pipe 6 serves as the connecting component between the inlet end 12 of the centrifugal pump 1 and the low-pressure fluid chamber 21. The low-pressure fluid chamber 21 is connected to the outlet end 13 through the inlet connecting pipe 6, and an inlet valve 33 is installed in the middle of the inlet connecting pipe 6. In this embodiment, both the inlet valve 33 and the outlet valve 31 are butterfly valves. During normal operation of the centrifugal pump 1, the inlet valve 33 is open, and the centrifugal pump 1 can pump the fluid out of the low-pressure fluid chamber 21. When the centrifugal pump 1 stops and the ambient temperature is higher than the freezing temperature, since there is no need to open the control valve 41 to allow fluid backflow, the inlet valve 33 can be closed. When centrifugal pump 1 stops and the ambient temperature is below the freezing point, inlet valve 33 needs to be opened, and the fluid returning to the valve chamber flows back to the low-pressure fluid chamber 21 through inlet connecting pipe 6. In addition, it includes expansion joint 71, reducer 72, expansion joint 73, and reducer 74. Outlet end 13 is connected to pipe section 52 via reducer 72 and expansion joint 71, and inlet end 12 is connected to inlet connecting pipe 6 via reducer 74 and expansion joint 73. Reducer 72 and reducer 74 serve as transitional connection components. Reducer 72 connects expansion joint 71 to outlet end 13, whose cross-sectional shape differs from the end shape of expansion joint 71. Reducer 74 connects expansion joint 73 to inlet end 12, whose cross-sectional shape differs from the end shape of expansion joint 73. In environments with large temperature variations, expansion joints 71 and 73 can compensate for additional stress caused by temperature changes or external vibrations.
[0029] Example 2:
[0030] This embodiment provides a water circulation cooling system that employs the centrifugal pump antifreeze device shown in Embodiment 1, based on... Figures 1 to 3 As shown, it includes a cooling pipe 81, a cooling tower 82, and a cooling pool 83. The cooling pipe 81 serves as the high-pressure fluid chamber 22, and the cooling pool 83 serves as the low-pressure fluid chamber 21. The end of the cooling pipe 81 away from the centrifugal pump 1 is connected to the inlet of the cooling tower 82, and the outlet of the cooling tower 82 is connected to the cooling pool 83.
[0031] Cooling pipe 81 is wrapped around the outside of the equipment requiring cooling. During system operation, centrifugal pump 1 pumps cooling water from cooling pool 83 into cooling pipe 81 to cool the equipment. After the cooling water absorbs heat and its temperature rises, it is cooled by cooling tower 82 and then flows back to cooling pool 83, completing a cycle. In actual use, the pressure inside cooling pipe 81 is greater than the pressure inside cooling pool 83. When centrifugal pump 1 stops at cold temperatures, outlet valve 31 is closed and control valve 41 is opened. The high-pressure fluid in cooling pipe 81, under the influence of the pressure difference, flows back to the valve chamber at a low flow rate along the return assembly and then back to cooling pool 83. The water in the valve chamber is always in a flowing state, preventing centrifugal pump 1 from being unable to start due to freezing. This water circulation cooling system can be applied in petrochemical circulating water projects to cool related equipment.
[0032] Furthermore, based on Figure 3 As shown, the outlet valve 31, centrifugal pump 1, and reflux assembly form a flow unit. Several groups of flow units are connected in parallel between the cooling pipe 81 and the cooling pool 83. The flow unit can be configured with six or eight groups, depending on the system scale. In each flow unit, the inlet end 12 of the centrifugal pump 1 is connected to the cooling pool 83, and the outlet end 13 is connected to the cooling pipe 81 via the outlet valve 31. Some flow units serve as the main operating units 84, which are always open, while the remaining flow units serve as backup units 85, which are generally not activated. For example, in this embodiment, the water circulation cooling system has six groups of flow units, four of which serve as the main operating units 84, and the other two as backup units 85. When a main operating unit 84 needs to be shut down due to a fault, the backup unit 85 can be activated to take over, ensuring the continuous operation of the water circulation cooling system.
[0033] For the standby unit 85, its outlet valve 31 is always closed under normal operation. When the ambient temperature is higher than the freezing temperature, the control valve 41 of the standby unit 85 simply needs to remain closed. When the ambient temperature is lower than the freezing temperature, the control valve 41 of the standby unit 85 is opened, ensuring that fluid always flows back into the valve chamber during normal operation of the standby unit 85, guaranteeing water flow within the valve chamber and preventing the impeller from freezing and becoming difficult to start. Since the return flow rate is much smaller than the flow rate pumped from the cooling pool 83 into the cooling pipe 81 in the system, the pressure in the cooling pipe 81 will always be higher than that in the cooling pool 83, and will not affect the operation of the entire water circulation cooling system.
[0034] When the main operating unit 84 needs to be shut down due to a fault, the control valve 41 of the standby unit 85 closes and the outlet valve 31 opens, and the centrifugal pump 1 starts running to replace the main operating unit 84. During troubleshooting, the main operating unit 84 closes the outlet valve 31. If the ambient temperature is below freezing, the control valve 41 can be opened during troubleshooting, ensuring fluid flow in the valve chamber of the centrifugal pump 1 within the main operating unit 84 to prevent icing during maintenance. If it is necessary to replace the centrifugal pump 1 or disassemble it for internal inspection, the outlet valve 31, control valve 41, and inlet valve 33 can all be closed. At this time, the centrifugal pump 1 is isolated from both the high-pressure fluid chamber 22 and the low-pressure fluid chamber 21, allowing it to be disassembled and opened.
[0035] For each group of flow units in this embodiment, the same Figure 1 and Figure 2 The structure is such that the inlet end 12 of the centrifugal pump 1 is connected to the cooling pool 83 in sequence through the second reducer 74, the second expansion joint 73 and the inlet connecting pipe 6 with the inlet valve 33 installed in the middle. The outlet end 13 of the centrifugal pump 1 is connected to the cooling pipe 81 in sequence through the first reducer 72, the first expansion joint 71 and the outlet connecting pipe 5. The connection method of the reflux assembly, the outlet valve 31 and the check valve 32 on the outlet connecting pipe 5 is the same as in embodiment 1, and will not be described again.
[0036] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A centrifugal pump antifreeze device, comprising a centrifugal pump, a low-pressure fluid chamber and a high-pressure fluid chamber, wherein the centrifugal pump has a valve body, the valve body has a valve cavity, an inlet end and an outlet end, an impeller is provided in the valve cavity, the inlet end is connected to the low-pressure fluid chamber, the outlet end is connected to the high-pressure fluid chamber, and an outlet valve is installed between the outlet end and the high-pressure fluid chamber; Its features are: It also includes a reflux assembly, which includes a control valve, a reflux pipe one, and a reflux pipe two. The inlet of the control valve is connected to the high-pressure fluid chamber through the reflux pipe one, and the outlet of the control valve is connected to the outlet end through the reflux pipe two. After the centrifugal pump stops, the outlet valve closes and the control valve opens. The fluid in the high-pressure fluid chamber passes through the first return pipe, the control valve and the second return pipe in sequence, then flows back to the valve chamber through the outlet end, and finally flows back to the low-pressure fluid chamber from the inlet end.
2. The centrifugal pump antifreeze device as described in claim 1, characterized in that: It also includes an outlet connecting pipe, the outlet valve is installed on the outlet connecting pipe, and the outlet connecting pipe is divided into pipe section one and pipe section two by the outlet valve. Pipe section one is connected to the high-pressure fluid chamber, pipe section two is connected to the outlet end, the end of the return pipe one away from the control valve is connected to pipe section one, and the end of the return pipe two away from the control valve is connected to pipe section two.
3. The centrifugal pump antifreeze device as described in claim 2, characterized in that: The outlet connecting pipe is also equipped with a check valve, which is located between the outlet valve and the return pipe and the outlet connecting pipe.
4. The centrifugal pump antifreeze device as described in claim 2, characterized in that: It also includes an inlet connecting pipe, through which the low-pressure fluid cavity is connected to the outlet end, and an inlet valve is installed in the middle of the inlet connecting pipe.
5. The centrifugal pump antifreeze device as described in claim 4, characterized in that: It also includes expansion joint one, reducer one, expansion joint two and reducer two. The outlet end is connected to the pipe section two in sequence through reducer one and expansion joint one. The inlet end is connected to the inlet connecting pipe in sequence through reducer two and expansion joint two.
6. A water circulation cooling system employing the centrifugal pump antifreeze device as described in any one of claims 1-5, characterized in that: It includes a cooling pipe, a cooling tower, and a cooling pool. The interior of the cooling pipe serves as the high-pressure fluid chamber, and the interior of the cooling pool serves as the low-pressure fluid chamber. The end of the cooling pipe away from the centrifugal pump is connected to the inlet of the cooling tower, and the outlet of the cooling tower is connected to the cooling pool.
7. The water circulation cooling system as described in claim 6, characterized in that: The outlet valve, the centrifugal pump, and the reflux assembly are combined to form a flow unit. The flow unit has several groups, and the several groups of flow units are connected in parallel between the cooling pipe and the cooling pool.