Double circulation water tank and circulating water cooling system

Abstract

The utility model provides a kind of double circulating water tank and circulating water cooling system, double circulating water tank includes box, baffle, first check valve and second check valve, box is used to store water;Baffle is set in box along vertical direction, to divide box into first chamber and second chamber;First check valve is set on the baffle, is configured to only allow water from first chamber into second chamber;Second check valve is set on the baffle, is configured to only allow water from second chamber into first chamber.The utility model is by being provided with baffle and first check valve, second check valve in box, forms double circulating water tank, plays the role of buffer and cold storage when inner circulating system and outer circulating system independent operation, thus can avoid water chilling unit frequent start-stop.In addition, cold and hot water room is separated, the water outlet and return water of inner circulation are connected from different water room, the water outlet and return water of outer circulation are also connected from different water room, avoid cold water and hot water directly mix, solve the problem of hot flow short circuit, eliminate energy waste.

Description

Technical Field

[0001] This utility model relates to the field of circulating chilled water, and more particularly to a dual circulating water tank and circulating water cooling system. Background Technology

[0002] During operation, the cooling load of a circulating chilled water system exhibits significant unevenness, requiring frequent load adjustments by the chiller unit. Traditional solutions include: First, adding a buffer pressurized water tank to the circulating pipeline. Second, adding a water storage tank between the chiller unit and the cooling equipment, with an internal circulation between the chiller unit and the storage tank, and an external circulation between the storage tank and the cooling equipment. The buffer pressurized water tank solution can buffer instantaneous peak loads, but the chiller unit and the cooling equipment cannot circulate independently and still need to operate synchronously, failing to solve the problem of frequent chiller unit start-stops. The water storage tank solution allows for independent operation of the internal and external circulation, avoiding frequent chiller unit start-stops; however, the storage tank is a continuous cavity, with both supply and return water connected to it, creating a heat flow short-circuit problem and resulting in energy waste. Utility Model Content

[0003] This utility model provides a dual-circulation water tank and circulating water cooling system, which aims to improve the existing circulating chilled water system's inability to simultaneously handle the problems of frequent start-up and shutdown of chiller units and heat flow short circuits.

[0004] Specifically, this utility model provides a dual-circulation water tank, including a tank body, a partition, a first check valve, and a second check valve. The tank body is used for water storage. The partition is vertically arranged inside the tank body to divide the tank body into a first chamber and a second chamber.

[0005] The housing is provided with a first water inlet, a second water inlet, a first water outlet, and a second water outlet. The first water inlet is used to connect the first chamber and the water outlet of the cooling equipment; the second water inlet is used to connect the second chamber and the water outlet of the chiller unit; the first water outlet is used to connect the first chamber and the water inlet of the chiller unit; and the second water outlet is used to connect the second chamber and the water inlet of the cooling equipment.

[0006] The first check valve is disposed on the partition and configured to allow water to enter the second chamber only from the first chamber; the second check valve is disposed on the partition and configured to allow water to enter the first chamber only from the second chamber.

[0007] Optionally, the partition is provided with a first through hole and a second through hole; the first one-way valve includes a first swing door, which is rotatably mounted at the first through hole on the partition to open or block the first through hole; when the first swing door opens the first through hole, the first swing door is located in the second chamber.

[0008] The second one-way valve includes a second swing valve, which is rotatably mounted at a second through hole on the partition to open or block the second through hole; when the second swing valve opens the second through hole, the second swing valve is located in the first chamber.

[0009] Optionally, the first check valve further includes a first pre-tightening device, which is used to drive the first swing door to close.

[0010] The first pre-tightening device includes a first fixing frame, a first guide rod, a first pull rod, and a first spring. The housing is provided with a first guide rod hole. The first fixing frame is disposed on the outer wall of the housing and located on one side of the first guide rod hole. The first fixing frame is provided with a first pre-tightening strip. One end of the first spring is connected to the first pre-tightening strip, and the other end is connected to the first guide rod. The end of the first guide rod away from the first spring passes through the first guide rod hole and is hinged to the first pull rod. The first pull rod is located in the first cavity, and its end away from the first guide rod is hinged to the first swing door.

[0011] Optionally, the first pretensioning device further includes a first gear; the first pretensioning bar is movably disposed on the first fixed frame; the first pretensioning bar is a rack and meshes with the first gear.

[0012] Optionally, the second check valve further includes a second pre-tightening device for driving the second swing door to close;

[0013] The second pre-tightening device includes a second fixing frame, a second guide rod, a second pull rod, and a second spring. The housing is provided with a second guide rod hole. The second fixing frame is disposed on the outer wall of the housing and located on one side of the second guide rod hole. The second fixing frame is provided with a second pre-tightening strip. One end of the second spring is connected to the second pre-tightening strip, and the other end is connected to the second guide rod. The end of the second guide rod away from the second spring passes through the second guide rod hole and is hinged to the second pull rod. The second pull rod is located in the second cavity, and its end away from the second guide rod is hinged to the second swing door.

[0014] Optionally, the second pretensioning device further includes a second gear; the second pretensioning bar is movably disposed on the second fixed frame; the second pretensioning bar is a rack and meshes with the second gear.

[0015] Optionally, the first swing door is mounted on the partition via a hinge, and a sealing gasket is provided at the end of the first through hole facing the first swing door; the second swing door is mounted on the partition via a hinge, and a sealing gasket is provided at the end of the second through hole facing the second swing door.

[0016] Optionally, the dual-circulation water tank further includes a drain outlet, an automatic air vent valve, and a pressure regulating pipe. The drain outlet is located at the bottom of the tank body to connect the inner and outer spaces of the tank body. The first chamber and the second chamber are each connected to one of the drain outlets. The automatic air vent valve is located at the top of the tank body. The first chamber and the second chamber are each connected to one of the automatic air vent valves. The pressure regulating pipe is connected to the second chamber.

[0017] Optionally, a manhole is provided on the enclosure; the enclosure is covered with an insulation layer.

[0018] This utility model also provides a circulating water cooling system, including a cooling device, a chiller unit, and a dual circulating water tank according to any one of the above; the water inlet of the cooling device is connected to the second water outlet on the second chamber, and the water outlet is connected to the first water inlet on the first chamber; the water inlet of the chiller unit is connected to the first water outlet on the first chamber, and the water outlet is connected to the second water inlet on the second chamber.

[0019] The beneficial effects of this utility model are as follows:

[0020] The dual-circulation water tank and circulating water cooling system provided by this utility model, by setting a partition and a first one-way valve and a second one-way valve in the tank body, forms a dual-circulation water tank. This tank acts as a buffer and stores cold water when the internal and external circulation systems operate independently, thus avoiding frequent start-ups and shutdowns of the chiller unit. Furthermore, this utility model separates the hot and cold water chambers; the outlet and return water of the internal circulation are connected to different chambers, and the outlet and return water of the external circulation are also connected to different chambers, avoiding direct mixing of cold and hot water, solving the problem of heat flow short-circuiting, and eliminating energy waste. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a circulating water cooling system provided in one embodiment of the present invention;

[0022] Figure 2 This is a schematic partial structural diagram of a dual-circulation water tank provided in one embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Box body; 2. Partition; 3. Second swing door; 4. First swing door; 5. Sealing gasket; 6. Second pull rod; 7. First pull rod; 8. Hinge; 9. Drain outlet; 10. Manhole; 11. Automatic air vent valve; 12. Insulation layer; 13. Pressure regulating pipe; 14. First water outlet; 15. Second water inlet; 16. Second water outlet; 17. First water inlet; 18. First chamber; 19. Second chamber; 20. Internal circulation pump; 21. External circulation pump; 22. Chiller unit; 23. Refrigeration equipment; 24. Second pre-tightening device; 25. Second fixing bracket; 26. Second gear; 27. Second pre-tightening bar; 28. Second spring; 29. ​​Second guide rod; 30. Second guide rod hole; 31. Second limit hole; 32. First pre-tightening device. Detailed Implementation

[0025] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0026] In the description of this utility model, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] Figure 1 This is a schematic diagram of a circulating water cooling system provided in one embodiment of this utility model. Figure 1 As shown, and refer to Figure 2This utility model provides a dual-circulation water tank, including a tank body 1, a partition 2, a first one-way valve, and a second one-way valve. The tank body 1 is used for water storage. The partition 2 is vertically arranged inside the tank body 1 to divide the tank body 1 into a first chamber 18 and a second chamber 19. The tank body has a first inlet 17, a second inlet 15, a first outlet 14, and a second outlet 16. The first inlet 17 is used to connect the first chamber 18 and the outlet of the cooling device 23. The second inlet 15 is used to connect... The second chamber 19 is connected to the outlet of the chiller unit 22; the first outlet 14 is used to connect the first chamber 18 to the inlet of the chiller unit 22; the second outlet 16 is used to connect the second chamber 19 to the inlet of the cooling equipment 23; the first check valve is disposed on the partition 2 and configured to allow water to enter the second chamber 19 only from the first chamber 18; the second check valve is disposed on the partition 2 and configured to allow water to enter the first chamber 18 only from the second chamber 19.

[0029] It should be noted that in this embodiment, the first chamber 18 and the second chamber 19 are used to store water at different temperatures; for example, the first chamber 18 stores water at 12°C and is the hot water chamber; the second chamber 19 stores water at 7°C and is the cold water chamber. When the internal circulation system operates independently, driven by the internal circulation pump 20, water flows from the hot water chamber into the internal circulation pump 20 and is pressurized before entering the chiller unit. After heat exchange in the chiller unit's evaporator, it returns to the cold water chamber. At this time, the pressure in the cold water chamber is higher than that in the hot water chamber. Under the action of the pressure difference, the water flows through the second one-way valve into the hot water chamber, completing the independent internal circulation process.

[0030] When the external circulation system operates independently, driven by the external circulation pump 21, water flows from the cold water chamber into the external circulation pump 21 and is pressurized before entering the cooling equipment. After heat exchange in the cooling equipment, it returns to the hot water chamber. At this time, the pressure in the hot water chamber is higher than that in the cold water chamber. Under the action of the pressure difference, the water flows through the first one-way valve into the cold water chamber, completing the independent external circulation process. When the cooling load is small and is an intermittent load, only the external circulation system needs to be turned on.

[0031] When the internal circulation system and the external circulation system are running simultaneously, the water in the hot water chamber is drawn into the internal circulation pump 20 and pressurized before entering the chiller evaporator. After heat exchange in the chiller evaporator, it returns to the cold water chamber. Then, it is drawn into the external circulation pump 21 from the cold water chamber and pressurized before entering the cooling equipment. After heat exchange in the cooling equipment, it returns to the hot water chamber, completing the entire circulation process.

[0032] This embodiment of the invention forms a dual-circulation water tank by installing a partition and a first and a second one-way valve within the tank body. This tank acts as a buffer and stores cold water when the internal and external circulation systems operate independently, thus avoiding frequent start-ups and shutdowns of the chiller unit. Furthermore, this embodiment uses separate hot and cold water chambers; the outlet and return water of the internal circulation are connected to different chambers, and the outlet and return water of the external circulation are also connected to different chambers. This avoids direct mixing of cold and hot water, solves the problem of heat flow short-circuiting, and eliminates energy waste.

[0033] In one embodiment of this utility model, the partition plate is provided with a first through hole and a second through hole; the first one-way valve includes a first swing valve 4, which is rotatably mounted on the first through hole on the partition plate 2 to open or block the first through hole; when the first swing valve 4 opens the first through hole, the first swing valve 4 is located in the second chamber 19. When the external circulation system operates independently, the pressure in the hot water chamber is higher than that in the cold water chamber. Under the action of the pressure difference, the water flow pushes open the first swing valve 4 and enters the cold water chamber, completing the independent external circulation process.

[0034] Specifically, the first one-way valve further includes a first pre-tightening device 32, which is used to drive the first swing door 4 to close. The first pre-tightening device includes a first fixing frame, a first guide rod, a first pull rod 7, and a first spring. The housing 1 is provided with a first guide rod hole. The first fixing frame is disposed on the outer wall of the housing 1 and is located on one side of the first guide rod hole. The first fixing frame is provided with a first pre-tightening strip. One end of the first spring is connected to the first pre-tightening strip, and the other end is connected to the first guide rod. The end of the first guide rod away from the first spring passes through the first guide rod hole and is hinged to the first pull rod 7. The first pull rod 7 is located in the first chamber 18, and its end away from the first guide rod is hinged to the first swing door 4.

[0035] In this embodiment, when the water pressure in the cold water chamber and the hot water chamber is balanced, the first swing door 4 closes under the action of the spring, tightly fitting against the partition 2 and sealing the first through hole to prevent cold water and hot water from mixing. When the pressure in the hot water chamber is higher than that in the cold water chamber, the water flow pushes open the first swing door 4 and enters the cold water chamber under the action of the pressure difference, while stretching the first spring. As water continues to flow into the cold water chamber, the pressure difference between the cold water chamber and the hot water chamber decreases, and the first spring contracts under the action of elastic potential energy. This contracts and pulls the first swing door 4 through the first guide rod and the first pull rod 7, causing the first swing door 4 to fit tightly against the partition 2 and sealing the first through hole.

[0036] Furthermore, the first pre-tightening device also includes a first gear; a first limiting hole is provided on the first fixed frame, and the first pre-tightening strip is movably disposed in the first limiting hole on the first fixed frame; the first pre-tightening strip is a rack and meshes with the first gear. When the pressure difference between the cold water chamber and the hot water chamber is small, the first gear can be driven to rotate, thereby driving the rack to move away from the housing 1, thus giving the first swing door 4 a pre-tightening force, further making the first swing door 4 fit tightly against the partition 2, which can not only ensure the isolation effect between the cold water chamber and the hot water chamber, but also avoid the problem of frequent opening and closing of the first swing door 4 due to small pressure difference fluctuations.

[0037] Similarly, the second one-way valve includes a second swing valve 3, which is rotatably mounted on the second through hole on the partition 2 to open or block the second through hole; when the second swing valve 3 opens the second through hole, the second swing valve 3 is located within the first chamber 18. During independent operation of the internal circulation system, the pressure in the cold water chamber is higher than that in the hot water chamber. Under the action of the pressure difference, the water flow pushes open the second swing valve 3 and enters the hot water chamber, completing the independent internal circulation process.

[0038] Specifically, the second one-way valve further includes a second pre-tightening device 24, which is used to drive the second swing door 3 to close. The second pre-tightening device includes a second fixing frame 25, a second guide rod 29, a second pull rod 6, and a second spring 28. The housing 1 is provided with a second guide rod hole 30. The second fixing frame 25 is disposed on the outer wall of the housing 1 and is located on one side of the second guide rod hole 30. The second fixing frame 25 is provided with a second pre-tightening strip 27. One end of the second spring 28 is connected to the second pre-tightening strip 27, and the other end is connected to the second guide rod 29. The end of the second guide rod 29 away from the second spring 28 passes through the second guide rod hole 30 and is hinged to the second pull rod 6. The second pull rod 6 is located in the second chamber 19, and its end away from the second guide rod 29 is hinged to the second swing door 3.

[0039] In this embodiment, when the water pressure in the cold water chamber and the hot water chamber is balanced, the second swing door 3 closes under the action of the spring, tightly fitting against the partition 2 and sealing the second through hole to prevent cold water and hot water from mixing. When the pressure in the cold water chamber is higher than that in the hot water chamber, the water flow pushes open the second swing door 3 and enters the hot water chamber under the action of the pressure difference, while stretching the second spring. As water continues to flow into the hot water chamber, the pressure difference between the cold water chamber and the hot water chamber decreases, and the second spring contracts under the action of elastic potential energy. This contracts and pulls the second swing door 3 through the second guide rod 29 and the second pull rod 6, making the second swing door 3 tightly fitting against the partition 2 and sealing the second through hole.

[0040] Furthermore, the second pre-tightening device 24 also includes a second gear 26; the second fixed frame is provided with a second limiting hole 31, and the second pre-tightening bar 27 is movably disposed in the second limiting hole 31 on the second fixed frame; the second pre-tightening bar 27 is a rack and meshes with the second gear 26. When the pressure difference between the cold water chamber and the hot water chamber is small, the second gear 26 can be driven to rotate, thereby driving the rack to move away from the housing 1, thus giving the second swing door 3 a pre-tightening force, further making the second swing door 3 fit tightly against the partition 2, which can not only ensure the isolation effect between the cold water chamber and the hot water chamber, but also avoid the problem of frequent opening and closing of the second swing door 3 due to small pressure difference fluctuations.

[0041] In one embodiment of this utility model, the first swing door 4 is mounted on the partition 2 via a hinge 8, and a sealing gasket 5 is provided at the end of the first through hole facing the first swing door 4; the second swing door 3 is mounted on the partition 2 via a hinge 8, and a sealing gasket 5 is provided at the end of the second through hole facing the second swing door 3. The sealing gasket 5 improves the sealing effect between the first swing door 4, the second swing door 3, and the partition 2. Furthermore, the first guide rod and the first pull rod 7 are hinged together by a hinge 8, and the first guide rod and the first swing door 4 are hinged together by a hinge 8. During the opening and closing process of the first swing door 4, the contact point between the first swing door 4 and the first pull rod 7 will move along an arc trajectory. Therefore, the end of the first pull rod 7 connected to the first swing door 4 will experience both axial and radial displacement. The end of the first pull rod 7 connected to the first guide rod will only experience axial displacement. Therefore, the pull rod will rotate slightly during the movement. The hinge 8 set between the first pull rod 7 and the first guide rod can satisfy the free rotation of the first pull rod 7, thereby ensuring that the first guide rod only needs to move axially and has no radial movement. This can ensure a smooth seal when the first guide rod moves relative to the first guide rod hole.

[0042] Similarly, the second guide rod 29 is hinged to the second pull rod 6 via a hinge 8, and the second pull rod 6 is hinged to the second swing door 3 via a hinge 8. During the opening and closing of the second swing door 3, the contact point between the second swing door 3 and the second pull rod 6 will move along an arc trajectory. Therefore, the end of the second pull rod 6 connected to the second swing door 3 will experience both axial and radial displacement; the end of the second pull rod 6 connected to the second guide rod will only experience axial displacement. Therefore, the pull rod will rotate slightly during the movement. The hinge 8 between the second pull rod 6 and the second guide rod can satisfy the free rotation of the second pull rod 6, thereby ensuring that the first guide rod only needs to move axially and has no radial movement. This ensures a smooth seal when the second guide rod and the second guide rod hole move relative to each other.

[0043] In one embodiment of this utility model, the dual-circulation water tank further includes a drain outlet 9, an automatic air vent valve 11, and a pressure regulating pipe 13. The drain outlet 9 is located at the bottom of the tank body 1 to connect the inner and outer spaces of the tank body 1. The first chamber 18 and the second chamber 19 are each connected to one of the drain outlets 9 so that the hot water chamber and the cold water chamber can be completely drained to meet the drainage requirements before maintenance.

[0044] In one embodiment of this utility model, the automatic exhaust valve 11 is disposed on the top of the housing 1, and the first chamber 18 and the second chamber 19 are each connected to one of the automatic exhaust valves 11 to promptly discharge the gas inside the hot water chamber and the cold water chamber. The constant pressure pipe 13 is connected to the second chamber 19 to ensure that the pressure of the external circulation system is at a stable value, so that the pressure of the external circulation system does not change with the operating mode of the refrigeration system.

[0045] In one embodiment of this utility model, a manhole 10 is provided on the housing 1 to facilitate normal maintenance. The housing 1 is covered with an insulation layer 12 to prevent the external temperature from affecting the water temperature in the hot water chamber and the cold water chamber.

[0046] This utility model also provides a circulating water cooling system, including a cooling device 23, a chiller unit 22, and a dual circulating water tank as described in any of the above embodiments, to achieve all the effects of a dual circulating water tank. Specifically, the inlet of the cooling device 23 is connected to the second outlet 16 on the second chamber 19, and the outlet is connected to the first inlet 17 on the first chamber 18; the inlet of the chiller unit 22 is connected to the first outlet 14 on the first chamber 18, and the outlet is connected to the second inlet 15 on the second chamber 19. An internal circulation pump 20 is connected between the inlet of the chiller unit 22 and the first outlet 14, and an external circulation pump 21 is connected between the inlet of the cooling device 23 and the second outlet 16.

[0047] In application, when the internal circulation system operates independently, driven by the internal circulation pump 20, water flows from the hot water chamber into the internal circulation pump 20 and is pressurized before entering the chiller unit. After heat exchange in the chiller unit's evaporator, it returns to the cold water chamber. At this time, the pressure in the cold water chamber is higher than that in the hot water chamber. Under the action of the pressure difference, the water flows through the second one-way valve into the hot water chamber, completing the independent internal circulation process.

[0048] When the external circulation system operates independently, driven by the external circulation pump 21, water flows from the cold water chamber into the external circulation pump 21 and is pressurized before entering the cooling equipment. After heat exchange in the cooling equipment, it returns to the hot water chamber. At this time, the pressure in the hot water chamber is higher than that in the cold water chamber. Under the action of the pressure difference, the water flows through the first one-way valve into the cold water chamber, completing the independent external circulation process. When the cooling load is small and is an intermittent load, only the external circulation system needs to be turned on.

[0049] When the internal circulation system and the external circulation system are running simultaneously, the water in the hot water chamber is drawn into the internal circulation pump 20 and pressurized before entering the chiller evaporator. After heat exchange in the chiller evaporator, it returns to the cold water chamber. Then, it is drawn into the external circulation pump 21 from the cold water chamber and pressurized before entering the cooling equipment. After heat exchange in the cooling equipment, it returns to the hot water chamber, completing the entire circulation process.

[0050] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A dual-circulation water tank, characterized in that, Includes a housing (1), a partition (2), a first check valve and a second check valve, wherein the housing (1) is used for water storage; the partition (2) is arranged vertically inside the housing (1) to divide the housing (1) into a first chamber (18) and a second chamber (19); The housing is provided with a first water inlet (17), a second water inlet (15), a first water outlet (14), and a second water outlet (16). The first water inlet (17) is used to connect the first chamber (18) and the water outlet of the cooling equipment (23); the second water inlet (15) is used to connect the second chamber (19) and the water outlet of the chiller unit (22); the first water outlet (14) is used to connect the first chamber (18) and the water inlet of the chiller unit (22); and the second water outlet (16) is used to connect the second chamber (19) and the water inlet of the cooling equipment (23). The first check valve is disposed on the partition (2) and configured to allow water to enter the second chamber (19) only from the first chamber (18); the second check valve is disposed on the partition (2) and configured to allow water to enter the first chamber (18) only from the second chamber (19).

2. The dual-circulation water tank according to claim 1, characterized in that, The partition plate is provided with a first through hole and a second through hole; the first one-way valve includes a first swing door (4), which is rotatably installed at the first through hole on the partition plate (2) to open or block the first through hole; when the first swing door (4) opens the first through hole, the first swing door (4) is located in the second chamber (19); The second one-way valve includes a second swing valve (3), which is rotatably mounted on the second through hole on the partition (2) to open or block the second through hole; when the second swing valve (3) opens the second through hole, the second swing valve (3) is located in the first chamber (18).

3. The dual-circulation water tank according to claim 2, characterized in that, The first check valve also includes a first pre-tightening device (32), which is used to drive the first swing door (4) to close; The first pre-tightening device (32) includes a first fixing frame, a first guide rod, a first pull rod (7) and a first spring. The housing (1) is provided with a first guide rod hole. The first fixing frame is set on the outer wall of the housing (1) and located on one side of the first guide rod hole. The first fixing frame is provided with a first pre-tightening strip. One end of the first spring is connected to the first pre-tightening strip and the other end is connected to the first guide rod. The end of the first guide rod away from the first spring passes through the first guide rod hole and is hinged to the first pull rod (7). The first pull rod (7) is located in the first chamber (18) and its end away from the first guide rod is hinged to the first swing door (4).

4. The dual-circulation water tank according to claim 3, characterized in that, The first pretensioning device further includes a first gear; the first pretensioning bar is movably disposed on the first fixed frame; the first pretensioning bar is a rack and meshes with the first gear.

5. The dual-circulation water tank according to claim 2, characterized in that, The second check valve also includes a second pre-tightening device (24), which is used to drive the second swing door (3) to close; The second pre-tightening device includes a second fixing frame (25), a second guide rod (29), a second pull rod (6), and a second spring (28). The housing (1) is provided with a second guide rod hole (30). The second fixing frame (25) is set on the outer wall of the housing (1) and is located on one side of the second guide rod hole (30). The second fixing frame (25) is provided with a second pre-tightening strip (27). One end of the second spring (28) is connected to the second pre-tightening strip (27), and the other end is connected to the second guide rod (29). The end of the second guide rod (29) away from the second spring (28) passes through the second guide rod hole (30) and is hinged to the second pull rod (6). The second pull rod (6) is located in the second chamber (19), and its end away from the second guide rod (29) is hinged to the second swing door (3).

6. The dual-circulation water tank according to claim 5, characterized in that, The second pretensioning device (24) further includes a second gear (26); the second pretensioning bar (27) is movably disposed on the second fixed frame (25); the second pretensioning bar (27) is a rack and meshes with the second gear (26).

7. The dual-circulation water tank according to claim 2, characterized in that, The first swing door (4) is mounted on the partition (2) by a hinge (8), and a sealing gasket (5) is provided at the end of the first through hole facing the first swing door (4); the second swing door (3) is mounted on the partition (2) by a hinge (8), and a sealing gasket (5) is provided at the end of the second through hole facing the second swing door (3).

8. The dual-circulation water tank according to claim 1, characterized in that, The dual-circulation water tank also includes a drain outlet (9), an automatic air vent valve (11), and a pressure regulating pipe (13). The drain outlet (9) is located at the bottom of the tank body (1) to connect the inner and outer spaces of the tank body (1). The first chamber (18) and the second chamber (19) are each connected to one of the drain outlets (9). The automatic air vent valve (11) is located at the top of the tank body (1). The first chamber (18) and the second chamber (19) are each connected to one of the automatic air vent valves (11). The pressure regulating pipe (13) is connected to the second chamber (19).

9. The dual-circulation water tank according to claim 1, characterized in that, The box (1) has a manhole (10); the box (1) is covered with an insulation layer (12).

10. A circulating water cooling system, characterized in that, It includes a cooling device (23), a chiller unit (22), and a dual-circulation water tank according to any one of claims 1 to 9; the inlet of the cooling device (23) is connected to the second outlet (16) on the second chamber (19), and the outlet is connected to the first inlet (17) on the first chamber (18); the inlet of the chiller unit (22) is connected to the first outlet (14) on the first chamber (18), and the outlet is connected to the second inlet (15) on the second chamber (19).

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