Closed normal-pressure energy storage water tank device for water energy storage air conditioning system and implementation method

Abstract

The invention discloses a closed normal-pressure water storage tank device for a water energy storage air conditioning system and an implementation method. Comprising an energy storage water tank, a water seal, first and second nitrogen balls, a nitrogen tank, first to fifth valves, a water escape valve, a nitrogen charging valve and a water replenishing valve, the top of the energy storage water tank is connected with the lowest point of the water seal; one side of the water seal is communicated with the atmosphere; the upper portion of the other side of the water seal is connected with two branch pipes, the tail end of the first branch pipe is provided with a second valve, and the second branch pipe is connected with the upper portion of the nitrogen tank and provided with a third valve. The lower part of the other side of the water seal is connected with the bottom of the nitrogen tank through a branch pipe; the first nitrogen ball is connected with the top of the nitrogen tank and provided with a fourth valve; the second nitrogen ball is connected with the top of the nitrogen tank and provided with a fifth valve; a nitrogen filling valve and a water replenishing valve are mounted at the top of the nitrogen tank; the closed normal-pressure operation of the energy storage water tank can be realized, the function of the expansion water tank is also realized, the initial investment is low, the water quality is good, the corrosion is small, the energy storage efficiency is high, the control is reliable, and the operation is safe.

Description

Technical Field

[0001] The present invention belongs to the technical field of heating, ventilation and air conditioning, and in particular relates to a closed normal pressure energy storage water tank device for a water energy storage air conditioning system and an implementation method thereof. Background Art

[0002] Air conditioners are a major consumer of electricity in cities, especially in the summer when peak cooling and electricity consumption coincide, placing significant pressure on the power system. my country places great emphasis on energy conservation and emission reduction. The power sector implements peak-offset electricity pricing to encourage users to proactively shift some of their peak electricity use to off-peak hours, thereby saving users operating costs and improving grid efficiency and safety.

[0003] Currently, large-scale central air-conditioning systems, especially regional cooling and heating systems, typically utilize water energy storage (i.e., water cooling / heat storage) technology to achieve peak-to-valley shifting of air-conditioning electricity consumption. The vast majority of existing water-storage air-conditioning systems utilize open-type energy-storage water tanks. While simple and inexpensive, open-type energy-storage water tanks are in direct contact with the atmosphere and the water in the tanks, allowing dust and impurities to easily enter the water, forming a dry-wet interface between air and water. This can lead to deterioration of the air-conditioning system's water quality, algae growth, and corrosion of the tanks. Some water-storage air-conditioning systems utilize pressurized closed-type energy-storage water tanks. While this avoids the aforementioned shortcomings of open-type energy-storage water tanks, their high pressure and high price limit their application. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings and deficiencies of the prior art and to provide a closed normal pressure energy storage water tank device for a water storage air conditioning system and an implementation method thereof.

[0005] The present invention is achieved through the following technical solutions:

[0006] A closed atmospheric pressure energy storage water tank device for a water storage air conditioning system, comprising an energy storage water tank 1, a water seal 2, a first nitrogen balloon 3, a second nitrogen balloon 4, a nitrogen tank 5, a first valve 7, a second valve 8, a third valve 9, a fourth valve 10, and a fifth valve 12;

[0007] The top of the energy storage water tank 1 is connected to the lowest point of the water seal 2;

[0008] One side of the water seal 2 is connected to the atmosphere; two branch pipes are connected to the upper part of the other side of the water seal 2, wherein the end of the branch pipe 1 is installed with a second valve 8, the branch pipe 2 is connected to the upper part of the nitrogen tank 5, and a third valve 9 is installed on the branch pipe 2; the lower part of the other side of the water seal 2 is connected to the bottom of the nitrogen tank 5 through a branch pipe, and a first valve 7 is installed on the branch pipe;

[0009] The first nitrogen balloon 3 is connected to the top of the nitrogen tank 5 through a pipeline, and a fourth valve 10 is installed on the pipeline;

[0010] The second nitrogen balloon 4 is connected to the top of the nitrogen tank 5 through a pipeline, and a fifth valve 12 is installed on the pipeline.

[0011] The working pressure of the first nitrogen balloon 3 and the second nitrogen balloon 4 is the smaller value between 0.6 times the water seal height and 12 kPa.

[0012] The effective volume of the nitrogen tank 5 is 1.2 to 1.5 times the maximum volume change of the water in the energy storage water tank 1 .

[0013] A nitrogen interface is installed on the upper part of the nitrogen tank 5, and the nitrogen interface is used to connect to the nitrogen source; a nitrogen filling valve 11 is installed on the nitrogen interface;

[0014] A water supply interface is installed on the upper part of the nitrogen tank 5, and the water supply interface is connected to a water pipe and connected to a tap water source; a water supply valve 13 is installed on the water supply interface.

[0015] A drain valve 6 is installed at the bottom of the nitrogen tank 5 .

[0016] A method for realizing closed-type normal-pressure operation of an energy storage water tank device for a water-storage air-conditioning system comprises the following steps:

[0017] S1, nitrogen tank filled with water:

[0018] In the initial state, the first valve 7, the second valve 8, the third valve 9, the fourth valve 10, the fifth valve 12, the drain valve 6, the nitrogen charging valve 11 and the water supply valve 13 are all closed;

[0019] Open the third valve 9 to allow the nitrogen tank 5 to communicate with the atmosphere through the water seal 2 that has not yet been filled with water, then open the water supply valve 13 to fill water into the nitrogen tank 5 until the nitrogen tank 5 is full of water, and then close the water supply valve 13 and the third valve 9;

[0020] S2, nitrogen tank filling:

[0021] Connect the nitrogen source to the nitrogen interface on the nitrogen tank 5, then open the nitrogen charging valve 11, and then open the first valve 7 to discharge the water in the nitrogen tank 5 into the energy storage water tank 1. When the water in the nitrogen tank 5 is completely drained and filled with nitrogen, close the nitrogen charging valve 11 and the first valve 7;

[0022] S3, filling the energy storage tank with water:

[0023] The energy storage water tank 1 is filled with water through the water inlet pipe connected to the energy storage air conditioning chilled water / hot water system, and the second valve 8 located above the water seal 2 is opened at the same time until the energy storage water tank 1 is full of water and water emerges from the second valve 8, then the filling of water into the energy storage water tank 1 is stopped and the second valve 8 is closed;

[0024] S4, nitrogen tank is integrated into the system:

[0025] Open the fourth valve 10 and the fifth valve 12 to connect the first nitrogen balloon 3, the second nitrogen balloon 4 and the nitrogen tank 5, and then open the first valve 7 and the third valve 9 in sequence. After stabilization, the lower section of the pipe section between point D and point E of the water seal 2 is water, and the upper section is nitrogen, completing the integration of the nitrogen tank 5, the energized water tank 1 and the water-storage air-conditioning system; the water seal formed by the water in the BCD pipe section of the water seal 2 and the nitrogen in the DE pipe section isolate the water in the energized water tank 1 from the atmosphere, realizing closed normal pressure operation of the energized water tank 1.

[0026] S5, during the normal operation of the energy storage air conditioning system, the energy storage water tank device operates in closed normal pressure:

[0027] During the normal operation of the energy storage air conditioning system, the energy storage water tank device of the present invention can realize the closed normal pressure full water operation of the energy storage water tank 1; the details are as follows:

[0028] During normal operation of the energy-storage air-conditioning system, the water in the water storage section of the water seal 2 isolates the energy-storage water tank 1 from the atmosphere and keeps the energy-storage water tank 1 at normal pressure. The volume of the water in the energy-storage water tank 1 changes due to temperature changes. The volume change of the water caused by thermal expansion and contraction is adjusted by the nitrogen tank 5, the first nitrogen balloon 3 and the second nitrogen balloon 4, thereby ensuring that the energy-storage water tank 1 remains full of water when the water temperature changes.

[0029] The volume change of the water in the energy storage water tank 1 specifically includes: an increase in the water volume of the energy storage air conditioning system due to thermal expansion and a decrease in the water volume of the energy storage air conditioning system due to thermal contraction.

[0030] When the water volume of the energy storage air-conditioning system increases due to thermal expansion, the method for the energy storage water tank device to achieve closed normal pressure operation: when the water in the energy storage air-conditioning system increases due to temperature increase, density decrease, and volume expansion, the volume of water in the energy storage air-conditioning system increases, the volume of water in the energy storage water tank 1 increases, and the water pressure increases; driven by the pressure difference, water flows from the energy storage water tank 1 into the nitrogen tank 5, the pressure in the nitrogen tank 5 increases, and part of the nitrogen flows from the nitrogen tank 5 into the first nitrogen balloon 3 and the second nitrogen balloon 4, and the volume of the first nitrogen balloon 3 and the second nitrogen balloon 4 increases; when the pressure of the water seal 2 reaches the maximum set value, the drain valve 6 is opened to drain water and discharge excess water, so that the pressure of the nitrogen tank 5 is reduced, and the water level of the water seal 2 returns to the normal value range; the pressure of the energy storage air-conditioning water system is stabilized to maintain the energy storage water tank 1 in a full water state.

[0031] When the water volume of the energy storage air conditioning system decreases due to cold shrinkage, the energy storage water tank device realizes closed normal pressure operation method: if the water in the energy storage air conditioning system decreases due to temperature reduction, density increases, and volume shrinks, the volume of water in the energy storage water tank 1 decreases, and water needs to be replenished to maintain a full water state; at this time, the internal pressure of the energy storage water tank 1 is less than the internal pressure of the nitrogen tank 5. Driven by the pressure difference, the water in the nitrogen tank 5 is first replenished into the energy storage water tank 1; the internal pressure of the nitrogen tank 5 decreases, the first nitrogen balloon 3 and the second nitrogen balloon 4 shrink, and nitrogen is replenished into the nitrogen tank 5 to maintain pressure balance; when the pressure of the water seal 2 reaches the minimum set value, the water replenishment valve 13 is opened to replenish water, increase the pressure of the nitrogen tank 5, and the water level of the water seal 2 returns to the normal value range; stabilize the pressure of the energy storage air conditioning water system and maintain the energy storage water tank 1 in a full water state.

[0032] Compared with the prior art, the present invention has the following advantages and effects:

[0033] 1. The present invention isolates the energy storage water tank from the atmosphere through a water seal, preventing oxygen and dust in the atmosphere from entering the stored water, improving the water quality of the air conditioning system, and effectively inhibiting the growth and reproduction of algae in the energy storage water tank, saving the cost of controlling water quality.

[0034] 2. When the energy storage tank is fully filled with water, the upper and lower water distributors in the tank can be arranged close to the top (bottom), and the ineffective energy storage volume is approximately zero, eliminating the ineffective heat transfer caused by convective heat transfer in the air layer, which not only improves the volumetric efficiency, but also greatly improves the energy storage efficiency.

[0035] 3. A simple water seal is used to isolate the normal pressure energized water tank from the atmosphere, rather than a conventional high-pressure closed water tank, which reduces the initial investment in the energized water tank.

[0036] 4. Nitrogen is used to replace air. The dry-wet interface in the nitrogen tank is nitrogen and water, which completely eliminates the oxidation corrosion inside the nitrogen tank. The full water operation of the energy storage water tank also makes the corrosion of the energy storage water tank controllable, extending the service life of the various facilities of the device.

[0037] 5. During normal operation of the energy-storage air-conditioning system, the water in the water storage section of the water seal 2 isolates the energy-storage water tank 1 from the atmosphere and maintains normal pressure in the energy-storage water tank 1. The volume of the water in the energy-storage water tank 1 changes due to temperature changes. The volume change of the water caused by thermal expansion and contraction is adjusted by the nitrogen tank 5, the first nitrogen balloon 3, and the second nitrogen balloon 4, thereby ensuring that the energy-storage water tank 1 remains full of water when the water temperature changes. This device also functions as an expansion tank and can absorb the volume change of the air-conditioning system water caused by thermal expansion and contraction.

[0038] 6. The present invention has an ingenious concept, simple and easy technical means, easy access to materials, stable and reliable control, and safe and guaranteed operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic structural diagram of a closed normal pressure energy storage water tank device for a water energy storage air conditioning system according to the present invention. DETAILED DESCRIPTION

[0040] The present invention is described in further detail below with reference to specific embodiments.

[0041] like Figure 1 The present invention discloses a closed atmospheric pressure energy storage water tank device for a water energy storage air conditioning system, the closed atmospheric pressure energy storage water tank device comprising an energy storage water tank 1, a water seal 2, a first nitrogen balloon 3, a second nitrogen balloon 4, a nitrogen tank 5, a first valve 7, a second valve 8, a third valve 9, a fourth valve 10 and a fifth valve 12;

[0042] The highest point of the top of the energy storage water tank 1 and the lowest point of the water seal 2 ( Figure 1 F in the middle) is connected; Figure 1 It can be seen that the top of the energy storage tank 1 is an arc top, and the lowest point of the water seal 2 ( Figure 1 Point F in the figure) is connected to the highest point of the arc top of the energy storage tank 1;

[0043] One side of the water seal 2 is connected to the atmosphere; two branch pipes are connected to the upper part of the other side of the water seal 2, wherein the end of the branch pipe 1 is installed with a second valve 8, the branch pipe 2 is connected to the upper part of the nitrogen tank 5, and a third valve 9 is installed on the branch pipe 2; the lower part of the other side of the water seal 2 is connected to the bottom of the nitrogen tank 5 through a branch pipe, and a first valve 7 is installed on the branch pipe;

[0044] The first nitrogen balloon 3 is connected to the top of the nitrogen tank 5 through a pipeline, and a fourth valve 10 is installed on the pipeline;

[0045] The second nitrogen balloon 4 is connected to the top of the nitrogen tank 5 through a pipeline, and a fifth valve 12 is installed on the pipeline.

[0046] The working pressure of the first nitrogen balloon 3 and the second nitrogen balloon 4 is a smaller value between 0.5 and 0.6 times the water seal height and 12 kPa.

[0047] The effective volume of the nitrogen tank 5 is 1.2 to 1.5 times the maximum volume change of the water in the energy storage water tank 1 .

[0048] A nitrogen interface is installed on the upper part of the nitrogen tank 5, and the nitrogen interface is used to connect to the nitrogen source; a nitrogen filling valve 11 is installed on the nitrogen interface;

[0049] A water supply interface is installed on the upper part of the nitrogen tank 5, and the water supply interface is connected to a water pipe and connected to a tap water source; a water supply valve 13 is installed on the water supply interface.

[0050] A drain valve 6 is installed at the bottom of the nitrogen tank 5 .

[0051] A method for realizing closed-type normal-pressure operation of an energy storage water tank device for a water-storage air-conditioning system can be realized by the following steps:

[0052] S1, nitrogen tank filled with water:

[0053] In the initial state, the first valve 7, the second valve 8, the third valve 9, the fourth valve 10, the fifth valve 12, the drain valve 6, the nitrogen charging valve 11 and the water supply valve 13 are all closed;

[0054] Open the third valve 9 to allow the nitrogen tank 5 to communicate with the atmosphere through the water seal 2 that has not yet been filled with water, then open the water supply valve 13 to fill water into the nitrogen tank 5 until the nitrogen tank 5 is full of water, and then close the water supply valve 13 and the third valve 9;

[0055] S2, nitrogen tank filling:

[0056] Connect the nitrogen source to the nitrogen interface on the nitrogen tank 5, then open the nitrogen charging valve 11, and then open the first valve 7 to discharge the water in the nitrogen tank 5 into the energy storage water tank 1. When the water in the nitrogen tank 5 is completely drained and filled with nitrogen, close the nitrogen charging valve 11 and the first valve 7;

[0057] S3, filling the energy storage tank with water:

[0058] The energy storage water tank 1 is filled with water through the water inlet pipe connected to the energy storage air conditioning chilled water / hot water system, and the second valve 8 located above the water seal 2 is opened at the same time until the energy storage water tank 1 is full of water and water emerges from the second valve 8, then the filling of water into the energy storage water tank 1 is stopped and the second valve 8 is closed;

[0059] S4, nitrogen tank is integrated into the system:

[0060] Open the fourth valve 10 and the fifth valve 12 to connect the first nitrogen balloon 3, the second nitrogen balloon 4 and the nitrogen tank 5, and then open the first valve 7 and the third valve 9 in sequence. After stabilization, the lower section of the pipe section between point D and point E of the water seal 2 is water, and the upper section is nitrogen, completing the integration of the nitrogen tank 5, the energized water tank 1 and the water-storage air-conditioning system; the water seal formed by the water in the BCD pipe section of the water seal 2 and the nitrogen in the DE pipe section isolate the water in the energized water tank 1 from the atmosphere, realizing closed normal pressure operation of the energized water tank 1.

[0061] S5, during the normal operation of the energy storage air conditioning system, the energy storage water tank device operates in closed normal pressure:

[0062] The application of the closed normal-pressure operation device of the energy storage water tank of the present invention in a water energy storage air-conditioning system is used to enable the energy storage water tank device to achieve closed normal-pressure full-water operation of the energy storage water tank 1 during normal operation of the energy storage air-conditioning system; specifically, during normal operation of the energy storage air-conditioning system, the water in the water storage section of the water seal 2 isolates the energy storage water tank 1 from the atmosphere and keeps the energy storage water tank 1 at normal pressure; the volume of the water in the energy storage water tank 1 changes due to temperature changes, and the volume change of the water caused by thermal expansion and contraction is adjusted by the nitrogen tank 5, the first nitrogen balloon 3 and the second nitrogen balloon 4, thereby ensuring that the energy storage water tank 1 remains full of water when the water temperature changes.

[0063] The volume change of the water in the energy storage water tank 1 specifically includes: an increase in the water volume of the energy storage air conditioning system due to thermal expansion, and a decrease in the water volume of the energy storage air conditioning system due to thermal contraction.

[0064] When the water volume of the energy storage air-conditioning system increases due to thermal expansion, the method for the energy storage water tank device to achieve closed normal pressure operation: when the water in the energy storage air-conditioning system increases due to temperature increase, density decrease, and volume expansion, the volume of water in the energy storage air-conditioning system increases, the volume of water in the energy storage water tank 1 increases, and the water pressure increases; driven by the pressure difference, water flows from the energy storage water tank 1 into the nitrogen tank 5, the pressure in the nitrogen tank 5 increases, and part of the nitrogen flows from the nitrogen tank 5 into the first nitrogen balloon 3 and the second nitrogen balloon 4, and the volume of the first nitrogen balloon 3 and the second nitrogen balloon 4 increases; when the pressure of the water seal 2 reaches the maximum set value, the drain valve 6 is opened to drain water and discharge excess water, so that the pressure of the nitrogen tank 5 is reduced, and the water level of the water seal 2 returns to the normal value range; the pressure of the energy storage air-conditioning water system is stabilized to maintain the energy storage water tank 1 in a full water state.

[0065] When the water volume of the energy storage air conditioning system decreases due to cold shrinkage, the energy storage water tank device realizes closed normal pressure operation method: if the water in the energy storage air conditioning system decreases due to temperature reduction, density increases, and volume shrinks, the volume of water in the energy storage water tank 1 decreases, and water needs to be replenished to maintain a full water state; at this time, the internal pressure of the energy storage water tank 1 is less than the internal pressure of the nitrogen tank 5. Driven by the pressure difference, the water in the nitrogen tank 5 is first replenished into the energy storage water tank 1; the internal pressure of the nitrogen tank 5 decreases, the first nitrogen balloon 3 and the second nitrogen balloon 4 shrink, and nitrogen is replenished into the nitrogen tank 5 to maintain pressure balance; when the pressure of the water seal 2 reaches the minimum set value, the water replenishment valve 13 is opened to replenish water, increase the pressure of the nitrogen tank 5, and the water level of the water seal 2 returns to the normal value range; stabilize the pressure of the energy storage air conditioning water system and maintain the energy storage water tank 1 in a full water state.

[0066] As described above, the present invention can be implemented better.

[0067] The implementation methods of the present invention are not limited to the above-mentioned embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A closed atmospheric pressure energy storage water tank device for a water energy storage air conditioning system, characterized by: The closed normal pressure energy storage water tank device comprises an energy storage water tank (1), a water seal (2), a first nitrogen balloon (3), a second nitrogen balloon (4), a nitrogen tank (5), a first valve (7), a second valve (8), a third valve (9), a fourth valve (10) and a fifth valve (12); The top of the energy storage water tank (1) is connected to the lowest point of the water seal (2); One side of the water seal (2) is in communication with the atmosphere; two branch pipes are connected to the upper portion of the other side of the water seal (2); a second valve (8) is installed at the end of the first branch pipe, the second branch pipe is connected to the upper portion of the nitrogen tank (5), and a third valve (9) is installed on the second branch pipe; the lower portion of the other side of the water seal (2) is connected to the bottom of the nitrogen tank (5) through a branch pipe, and a first valve (7) is installed on the branch pipe; The first nitrogen balloon (3) is connected to the top of the nitrogen tank (5) through a pipeline, and a fourth valve (10) is installed on the pipeline; The second nitrogen balloon (4) is connected to the top of the nitrogen tank (5) through a pipeline, and a fifth valve (12) is installed on the pipeline.

2. The closed atmospheric pressure energy storage water tank device for a water energy storage air conditioning system according to claim 1, characterized in that: The working pressure of the first nitrogen balloon (3) and the second nitrogen balloon (4) is the smaller value between 0.6 times the water seal height and 12 kPa.

3. The closed atmospheric pressure energy storage water tank device for a water energy storage air conditioning system according to claim 1, characterized in that: The effective volume of the nitrogen tank (5) is 1.2 to 1.5 times the maximum volume change of the water in the energy storage water tank (1).

4. The closed atmospheric pressure energy storage water tank device for a water energy air conditioning system according to claim 1, characterized in that: A nitrogen interface is installed on the upper part of the nitrogen tank (5), and the nitrogen interface is used to connect to a nitrogen gas source; a nitrogen filling valve (11) is installed on the nitrogen interface; A water supply interface is installed on the upper part of the nitrogen tank (5), and the water supply interface is connected to a water pipe and connected to a tap water source; a water supply valve (13) is installed on the water supply interface.

5. The closed atmospheric pressure energy storage water tank device for a water energy storage air conditioning system according to claim 1, characterized in that: A drain valve (6) is installed at the bottom of the nitrogen tank (5).

6. A method for realizing closed normal pressure operation of an energy storage water tank device, characterized in that The method is implemented by using the closed normal pressure energy storage water tank device according to any one of claims 1 to 5, comprising the following steps: S1, nitrogen tank filled with water: In the initial state, the first valve (7), the second valve (8), the third valve (9), the fourth valve (10), the fifth valve (12), the drain valve (6), the nitrogen filling valve (11) and the water supply valve (13) are all in a closed state; Open the third valve (9) to allow the nitrogen tank (5) to communicate with the atmosphere through the water seal (2) that has not yet been filled with water, then open the water supply valve (13) to fill water into the nitrogen tank (5) until the nitrogen tank (5) is full of water, and then close the water supply valve (13) and the third valve (9); S2, nitrogen tank filling: Connect the nitrogen source to the nitrogen interface on the nitrogen tank (5), then open the nitrogen filling valve (11), and then open the first valve (7) to discharge the water in the nitrogen tank (5) into the energy storage water tank (1). When the water in the nitrogen tank (5) is completely drained and filled with nitrogen, close the nitrogen filling valve (11) and the first valve (7); S3, filling the energy storage tank with water: The energy storage water tank (1) is filled with water through a water inlet pipe connected to the energy storage air conditioning chilled water / hot water system, and at the same time, the second valve (8) located above the water seal (2) is opened until the energy storage water tank (1) is full of water and water emerges from the second valve (8), then the filling of water into the energy storage water tank (1) is stopped, and the second valve (8) is closed; S4, nitrogen tank is integrated into the system: Open the fourth valve (10) and the fifth valve (12) to connect the first nitrogen balloon (3) and the second nitrogen balloon (4) with the nitrogen tank (5), and then open the first valve (7) and the third valve (9) in sequence. After stabilization, the lower section of the pipe section between point D and point E of the water seal (2) is water, and the upper section is nitrogen, completing the integration of the nitrogen tank (5) with the energy storage water tank 1 and the water energy storage air conditioning system; the water seal formed by the water in the BCD pipe section of the water seal (2) and the nitrogen in the DE pipe section isolate the water in the energy storage water tank (1) from the atmosphere, realizing the closed normal pressure operation of the energy storage water tank (1); S5, during the normal operation of the energy storage air conditioning system, the energy storage water tank device operates in closed normal pressure: During normal operation of the energy storage air conditioning system, the water in the water storage section of the water seal (2) isolates the energy storage water tank (1) from the atmosphere and keeps the energy storage water tank (1) at a constant pressure; the volume of the water in the energy storage water tank 1 changes due to temperature changes, and the volume change of the water caused by thermal expansion and contraction is adjusted by the nitrogen tank (5), the first nitrogen balloon (3) and the second nitrogen balloon (4), thereby ensuring that the energy storage water tank (1) remains full of water when the water temperature changes.

7. The method for realizing closed normal pressure operation of an energy storage water tank device according to claim 6, characterized in that: The volume change of water in the energy storage water tank (1) specifically includes: an increase in the water volume of the energy storage air conditioning system due to thermal expansion, and a decrease in the water volume of the energy storage air conditioning system due to thermal contraction.

8. The method for realizing closed normal pressure operation of an energy storage water tank device according to claim 7, characterized in that: When the water volume of the energy storage air conditioning system increases due to thermal expansion, the method for the energy storage water tank device to achieve closed normal pressure operation is as follows: When the water in the energy storage air conditioning system increases in volume due to temperature increase, density decrease, and volume expansion, the volume of water in the energy storage air conditioning system increases, and the water pressure increases; driven by the pressure difference, water flows from the energy storage water tank (1) into the nitrogen tank (5), the pressure in the nitrogen tank (5) increases, and part of the nitrogen flows from the nitrogen tank (5) into the first nitrogen balloon (3) and the second nitrogen balloon (4), and the volume of the first nitrogen balloon (3) and the second nitrogen balloon (4) increases; when the pressure of the water seal (2) reaches the maximum set value, the drain valve (6) is opened to drain water and discharge excess water, so that the pressure of the nitrogen tank (5) decreases and the water level of the water seal (2) returns to the normal value range; the pressure of the energy storage air conditioning water system is stabilized, and the energy storage water tank (1) is maintained in a full water state.

9. The closed-type normal-pressure operation method of the energy storage water tank device according to claim 7 is characterized in that: When the water volume of the energy storage air conditioning system decreases due to cold contraction, the method for the energy storage water tank device to achieve closed normal pressure operation: If the water in the energy storage air conditioning system decreases in temperature, becomes denser, and shrinks in volume, the volume of water in the energy storage water tank (1) decreases, and water needs to be added to keep it full; at this time, the internal pressure of the energy storage water tank (1) is lower than the internal pressure of the nitrogen tank (5), and under the pressure difference, the water in the nitrogen tank (5) is first added to the energy storage water tank (1); the internal pressure of the nitrogen tank (5) decreases, the first nitrogen balloon (3) and the second nitrogen balloon (4) shrink, and nitrogen is added to the nitrogen tank (5) to maintain pressure balance; When the pressure of the water seal (2) reaches the minimum set value, the water supply valve (13) is opened to supply water, thereby increasing the pressure of the nitrogen tank (5) and returning the water level of the water seal (2) to the normal range; the pressure of the energy storage air conditioning water system is stabilized, and the energy storage water tank (1) is maintained in a full water state.

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