A micro-pressure maintaining device for large storage tanks

Abstract

The present invention discloses a micro-pressure maintaining device for large storage tanks. One side of the upper part of the water storage tank is provided with a water inlet pipe, and the lower part of the water storage tank is provided with an overflow tank. A pressure maintaining overflow pipe is arranged inside the overflow tank. The pressure maintaining overflow pipe passes through the water storage tank and its upper opening is higher than the bottom plate of the water storage tank. One side of the upper part of the overflow tank is provided with a pressure relief pipe, and one end of the pressure relief pipe is connected to a sewage disposal tank; One side of the upper part of the water storage tank is provided with an air inlet pipe. The lower end of the air inlet pipe is lower than the upper opening of the pressure maintaining overflow pipe, and the lower end of the air inlet pipe does not contact the bottom plate of the water storage tank. In the present invention, an overflow tank is arranged at the lower part of the water storage tank, a pressure maintaining overflow pipe is arranged inside the overflow tank, and an air inlet pipe is arranged at the upper part of the water storage tank. During the non-overflow period, when the air pressure in the storage tank is greater than a certain pressure, the pressure maintaining overflow pipe exhausts air externally, and the entire storage tank relieves pressure externally; When the air pressure in the storage tank is less than a certain pressure, the air inlet pipe intakes air for pressure compensation, ensuring that the internal pressure of the storage tank is maintained within a safe range.

Description

Technical Field

[0001] The present invention belongs to the technical field of pressure maintaining devices, and particularly relates to a micro-pressure maintaining device for large storage tanks. Background Art

[0002] After the implementation of centralized heating and the adoption of clean fuels (oil, gas) for heating in large and medium-sized cities in China, the pollution situation mainly dominated by soot and sulfides has been alleviated, but the pollution of nitrogen oxides to the atmospheric quality has not been alleviated.

[0003] In recent years, the construction of electric power has accelerated, the tense situation of power supply has tended to ease, and power surplus has emerged in quite a few regions. From a development perspective, some regions have begun to encourage the development of electric heating sources. Some cities have also started to develop electric heating for heating in order to improve the urban atmospheric environment quality. Many enterprises focusing on market economy development have taken the lead in adopting electric heating for heating to provide heat energy for their enterprises.

[0004] Electricity consumption has peak periods and off-peak periods. Electricity consumption is divided into valley electricity during off-peak periods and peak electricity during peak periods. Usually, the electricity consumption during peak electricity periods is relatively large, and the utilization rate of the electric energy generated by power plants during valley electricity periods is relatively low, resulting in a lot of electric energy being wasted.

[0005] Due to the uneven electricity consumption, the peak-valley difference of the power grid has been further enlarged. And the peak shaving capacity of China's power grid is seriously insufficient, which reduces the operating efficiency of generating units and causes energy waste. To reasonably allocate power grid resources and reduce energy consumption, some places advocate off-peak electricity use. To cooperate with off-peak electricity use, people have developed electric heat storage heating equipment. During off-peak electricity consumption, the electric heating tube works to heat the heat storage body, and the heat storage body stores energy. When it comes to peak electricity consumption, the electric heating tube does not work, and the heat storage body that has stored heat dissipates heat to the outside to achieve the purpose of heating.

[0006] Electric heat storage heating is an important measure to transfer peak electricity, develop off-peak electricity use, optimize resource allocation, and protect the ecological environment. The application of heat storage heating equipment can not only transfer peak electricity, but also bring great benefits to preventing and controlling air pollution and improving the urban electricity consumption structure.

[0007] At present, most heat storage devices use large water storage tanks to store high-temperature hot water, filling them with high-temperature water during valley electricity periods and supplying heat during peak electricity periods. When the water temperature inside the water storage tank rises, the water expands and the pressure also rises, which will have a stress impact on the large water storage tank; when the water temperature drops, the water contracts and the pressure becomes low, which will also have a stress impact on the water storage tank, thus triggering accidents. Therefore, it is necessary to keep the pressure in the water tank within a certain safe range. Summary of the Invention

[0008] The object of the present invention is to overcome the deficiencies in the prior art and provide a micro-pressure maintaining device for large storage tanks. An overflow tank is provided at the lower part of the water storage tank, a pressure maintaining overflow pipe is arranged inside the overflow tank, an air inlet pipe is arranged at the upper part of the water storage tank. During the non-overflow period, when the air pressure in the storage tank is greater than a certain pressure, the pressure maintaining overflow pipe exhausts air externally, and the entire storage tank releases pressure externally; when the air pressure in the storage tank is less than a certain pressure, the air inlet pipe intakes air for pressure compensation, ensuring that the internal pressure of the storage tank is maintained within a safe range.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is:

[0010] A micro-pressure maintaining device for large storage tanks, comprising a water storage tank and an overflow tank. One side of the upper part of the water storage tank is provided with a water inlet pipe, and the upper end of the water inlet pipe is provided with a connecting flange, which is detachably connected to the storage tank overflow pipe (not shown in the figure). The lower part of the water storage tank is provided with an overflow tank, and a pressure maintaining overflow pipe is arranged inside the overflow tank. The pressure maintaining overflow pipe passes through the water storage tank and its upper opening is higher than the bottom plate of the water storage tank. The space between the upper opening of the pressure maintaining overflow pipe and the bottom of the water storage tank forms a liquid seal volume. One side of the upper part of the overflow tank is provided with a pressure relief pipe, and one end of the pressure relief pipe is connected to a sewage disposal pit (not shown in the figure); One side of the upper part of the water storage tank is provided with an air inlet pipe, the lower end of the air inlet pipe is lower than the upper opening of the pressure maintaining overflow pipe, and the lower end of the air inlet pipe does not contact the bottom plate of the water storage tank.

[0011] When the storage tank overflows, the fluid flows into the water storage tank through the storage tank overflow pipe and then flows into the overflow tank through the pressure maintaining overflow pipe. When the liquid level height of the fluid in the overflow tank reaches the pressure relief pipe, the fluid overflows from the pressure relief pipe into the sewage disposal pit, ensuring the normal use of the overflow function of the storage tank.

[0012] During the non-overflow period, the liquid level in the water storage tank is lower than the upper opening of the pressure maintaining overflow pipe. When the air pressure in the storage tank is greater than the pressure formed by the height L3 between the pressure relief pipe and the bottom of the pressure maintaining overflow pipe, the high-pressure gas is discharged outward through the pressure maintaining overflow pipe and the pressure relief pipe in sequence, and the entire storage tank releases pressure externally; when the air pressure in the storage tank is less than the pressure formed by the liquid seal height L2 between the upper opening of the pressure maintaining overflow pipe and the bottom plate of the water storage tank, a negative pressure is formed inside the storage tank and the water storage tank, and external air enters the water storage tank and the storage tank through the air inlet pipe for pressure compensation, ensuring that the internal pressure of the storage tank is maintained within a safe range.

[0013] As a further preference of this technical solution, a filter screen is provided on the upper part of the air inlet pipe, preventing external dust from entering the water storage tank through the air inlet pipe.

[0014] As a further preference of this technical solution, a check valve is provided on the pressure relief pipe, and the check valve prevents air from entering the overflow tank and affecting the accuracy of pressure relief.

[0015] As a further preference of the technical solution, an expansion pipe is internally threaded at the upper end of the pressure-holding overflow pipe. The expansion pipe facilitates the adjustment of the height between the upper opening of the pressure-holding overflow pipe and the bottom plate of the water storage tank, thereby adjusting the air replenishing pressure of the storage tank.

[0016] As a further preference of the technical solution, a limit ring plate is provided at the upper end of the expansion pipe. The limit ring plate restricts the downward adjustment range of the expansion pipe, avoiding the difficulty of taking out the expansion pipe after it is screwed into the pressure-holding overflow pipe; handles are provided on both sides of the limit ring plate, which facilitates the quick adjustment of the expansion pipe without tools.

[0017] As a further preference of the technical solution, the overflow tank is made of a transparent material, and scale lines are provided on one side of the overflow tank, which is convenient for judging the position of the adjusting plate, thereby judging the pressure relief pressure of the storage tank.

[0018] As a further preference of the technical solution, an adjusting plate is provided inside the overflow tank. The bottom of the pressure-holding overflow pipe is installed on the adjusting plate, and a number of notches are provided at the bottom of the pressure-holding overflow pipe. A screw rod is provided at the lower part of the adjusting plate, and the screw rod is threadedly connected to the bottom plate of the overflow tank. A hand wheel is provided at the lower end of the screw rod; according to the internal pressure-bearing capacity of the storage tank, the hand wheel is rotated to adjust the height L3 between the pressure relief pipe and the lower opening of the pressure-holding overflow pipe, thereby adjusting the pressure relief pressure of the storage tank and expanding the applicable range of the micro-pressure guarantee device.

[0019] As a further preference of the technical solution, the length L1 of the air inlet pipe is greater than the liquid level height L3 between the pressure relief pipe and the bottom of the pressure-holding overflow pipe. When the internal pressure of the storage tank is greater than the pressure generated by the liquid level height L3 between the pressure relief pipe and the bottom of the pressure-holding overflow pipe, the pressure-holding overflow pipe relieves pressure externally. The static pressure of the liquid level in the air inlet pipe is greater than the pressure relief pressure of the overflow tank, avoiding the discharge of fluid from the upper opening of the air inlet pipe.

[0020] As a further preference of the technical solution, the volume V of the overflow tank B is greater than twice the internal volume V of the pressure-holding overflow pipe b , when the pressure of the storage tank is greater than the pressure generated by the liquid level height L3 between the pressure relief pipe and the bottom of the pressure-holding overflow pipe and the pressure relief is completed, when the internal pressure of the storage tank is equal to 0 kpa, it is ensured that the upper opening of the pressure-holding overflow pipe and the bottom plate of the water storage tank are still full of liquid; when the pressure of the storage tank is less than the pressure formed by the liquid seal height between the upper opening of the pressure-holding overflow pipe and the bottom plate of the water storage tank, and the overflow tank further injects liquid into the pressure-holding overflow pipe, no air is sucked into the overflow tank, ensuring the accuracy of the pressure-holding device.

[0021] As a further preference of the technical solution, the liquid seal volume Vc formed between the upper opening of the pressure-holding overflow pipe and the bottom plate of the water storage tank is greater than the volume V of the air inlet pipe dWhen the pressure inside the storage tank is greater than the pressure generated by the liquid level height L3 between the pressure relief pipe and the bottom of the pressure maintaining overflow pipe, and the pressure maintaining overflow pipe discharges pressure externally, the liquid injection height of the fluid between the upper opening of the pressure maintaining overflow pipe and the bottom plate of the water storage tank into the air inlet pipe is: the liquid level height L3 between the pressure relief pipe and the bottom of the pressure maintaining overflow pipe. After liquid injection, the liquid seal fluid will not be sucked empty, ensuring the accuracy of the pressure maintaining device.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1) An overflow tank is provided at the lower part of the water storage tank, a pressure maintaining overflow pipe is arranged inside the overflow tank, and an air inlet pipe is arranged at the upper part of the water storage tank. During the non-overflow period, when the air pressure inside the storage tank is greater than a certain pressure, the pressure maintaining overflow pipe discharges air externally, and the entire storage tank discharges pressure externally; when the air pressure inside the storage tank is less than a certain pressure, the air inlet pipe intakes air for pressure compensation, ensuring that the internal pressure of the storage tank is maintained within a safe range.

[0024] 2) A filter screen is provided at the upper part of the air inlet pipe, preventing external dust from entering the interior of the water storage tank through the air inlet pipe.

[0025] 3) A check valve is provided on the pressure relief pipe, and the check valve prevents air from entering the overflow tank and affecting the accuracy of pressure relief.

[0026] 4) A telescopic pipe is internally thread-connected to the upper end of the pressure maintaining overflow pipe. The telescopic pipe facilitates adjusting the height between the upper opening of the pressure maintaining overflow pipe and the bottom plate of the water storage tank, thereby adjusting the air replenishing pressure of the storage tank.

[0027] 5) A limit ring plate is provided at the upper end of the telescopic pipe. The limit ring plate restricts the downward adjustment range of the telescopic pipe, preventing the telescopic pipe from being difficult to take out after being screwed into the pressure maintaining overflow pipe; handles are provided on both sides of the limit ring plate, and the handles facilitate quick adjustment of the telescopic pipe without tools.

[0028] 6) The overflow tank is made of a transparent material, and a scale line is provided on one side of the overflow tank, facilitating judging the position of the adjusting plate and thus judging the pressure relief pressure of the storage tank.

[0029] 7) An adjusting plate is provided inside the overflow tank. The bottom of the pressure maintaining overflow pipe is installed on the adjusting plate, and a number of notches are provided at the bottom of the pressure maintaining overflow pipe. A screw rod is provided at the lower part of the adjusting plate, and the screw rod is thread-connected to the bottom plate of the overflow tank. A hand wheel is provided at the lower end of the screw rod; according to the internal pressure bearing capacity of the storage tank, the hand wheel is rotated to adjust the height L3 between the pressure relief pipe and the lower opening of the pressure maintaining overflow pipe, thereby adjusting the pressure relief pressure of the storage tank and expanding the applicable range of the micro-pressure guarantee device.

[0030] 8) The length of the air inlet pipe is greater than the liquid level height L3 between the pressure relief pipe and the bottom of the pressure maintaining overflow pipe. When the pressure inside the storage tank is greater than the pressure generated by the liquid level height L3 between the pressure relief pipe and the bottom of the pressure maintaining overflow pipe, the pressure maintaining overflow pipe discharges pressure externally, and the static pressure of the liquid level in the air inlet pipe is greater than the pressure relief pressure of the overflow tank, preventing the fluid from discharging from the upper opening of the air inlet pipe.

[0031] 9) The volume V of the overflow tank B is greater than twice the internal volume V of the pressure-holding overflow pipe b , when the pressure in the storage tank is greater than the pressure generated by the liquid level height L3 between the pressure relief pipe and the bottom of the pressure-holding overflow pipe and the pressure relief is completed, when the internal pressure of the storage tank is equal to 0 kpa, it is ensured that the upper opening of the pressure-holding overflow pipe and the bottom plate of the water storage tank are still full of liquid; when the pressure in the storage tank is less than the pressure formed by the liquid seal height between the upper opening of the pressure-holding overflow pipe and the bottom plate of the water storage tank and the overflow tank further injects liquid into the pressure-holding overflow pipe, the overflow tank will not suck in air and ensure the accuracy of the pressure-holding device.

[0032] 10) The liquid seal volume Vc formed between the upper opening of the pressure-holding overflow pipe and the bottom plate of the water storage tank is greater than the volume V of the air inlet pipe d , when the internal pressure in the storage tank is greater than the pressure generated by the liquid level height between the pressure relief pipe and the bottom of the pressure-holding overflow pipe and the pressure-holding overflow pipe discharges pressure externally, the height of the fluid between the upper opening of the pressure-holding overflow pipe and the bottom plate of the water storage tank injected into the air inlet pipe is: the liquid level height L3 between the pressure relief pipe and the bottom of the pressure-holding overflow pipe. After injection, the liquid seal fluid will not be sucked empty, ensuring the accuracy of the pressure-holding device. Description of the Drawings

[0033] Attached Figure 1 is a schematic structural diagram of a micro-pressure maintaining device for a large storage tank according to the present invention.

[0034] Attached Figure 2 is a cross-sectional view of a micro-pressure maintaining device for a large storage tank according to the present invention.

[0035] Attached Figure 3 is an explosion diagram of the overflow pipe in a micro-pressure maintaining device for a large storage tank according to the present invention.

[0036] Attached Figure 4 is a schematic structural diagram of the telescopic pipe in a micro-pressure maintaining device for a large storage tank according to the present invention.

[0037] In the figure: 1, water storage tank; 2, water inlet pipe; 3, connecting flange; 4, overflow tank; 5, scale line; 6, pressure-holding overflow pipe; 7, adjusting plate; 8, screw; 9, handwheel; 10, air inlet pipe; 11, pressure relief pipe; 12, check valve; 13, telescopic pipe; 14, limit ring plate; 15, handle; Detailed Embodiment

[0038] Next, in combination with the attached Figures 1-4 , the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0039] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, specific orientation structure and operation. Therefore, it should not be construed as a limitation to the present invention.

[0040] In this embodiment, the pressure-holding range of the pressure-holding device is set to -0.3 KPa - 12 Kpa, that is, L2 = 30 mm and L3 = 1200 mm.

[0041] A micro-pressure holding device for a large storage tank, comprising a water storage tank 1 and an overflow tank 4. One side of the upper part of the water storage tank 1 is provided with a water inlet pipe 2, and the upper end of the water inlet pipe 2 is provided with a connecting flange 3. The connecting flange 3 is detachably connected to the overflow pipe of the storage tank (not shown in the figure). The lower part of the water storage tank 1 is provided with an overflow tank 4. A pressure-holding overflow pipe 6 is arranged inside the overflow tank 4. The pressure-holding overflow pipe 6 passes through the water storage tank 1 and its upper opening is higher than the bottom plate of the water storage tank 1. The space between the upper opening of the pressure-holding overflow pipe 6 and the bottom of the water storage tank 1 forms a liquid seal volume. One side of the upper part of the overflow tank 4 is provided with a pressure relief pipe 11, and one end of the pressure relief pipe 11 is connected to a sewage discharge tank (not shown in the figure); One side of the upper part of the water storage tank 1 is provided with an air inlet pipe 10. The lower end of the air inlet pipe 10 is lower than the upper opening of the pressure-holding overflow pipe 6, and the lower end of the air inlet pipe 10 does not contact the bottom plate of the water storage tank 1.

[0042] When the storage tank overflows, the fluid flows into the interior of the water storage tank 1 through the overflow pipe of the storage tank and into the interior of the overflow tank 4 through the pressure-holding overflow pipe 6. When the fluid level in the overflow tank 4 reaches the pressure relief pipe 11, the fluid overflows from the pressure relief pipe 11 into the sewage discharge tank, ensuring the normal use of the overflow function of the storage tank.

[0043] During the non-overflow period, the liquid level in the water storage tank 1 is lower than the upper opening of the pressure-holding overflow pipe 6. When the air pressure in the storage tank is greater than 12 Kpa, the high-pressure gas is discharged outward through the pressure-holding overflow pipe 6 and the pressure relief pipe 11 in sequence, and the entire storage tank discharges pressure to the outside; When the air pressure in the storage tank is less than -0.3 KPa, a negative pressure is formed inside the storage tank and the water storage tank 1, and external air enters the interior of the water storage tank 1 and the storage tank through the air inlet pipe 10 for pressure compensation, ensuring that the internal pressure of the storage tank is maintained within a safe range.

[0044] In this embodiment, a filter screen is provided on the upper part of the air inlet pipe 10, preventing external dust from entering the interior of the water storage tank 1 through the air inlet pipe 10.

[0045] In this embodiment, a one-way valve 12 is provided on the pressure relief pipe 11. The one-way valve 12 prevents air from entering the overflow tank 4 and affecting the accuracy of pressure relief.

[0046] In this embodiment, an expansion pipe 13 is internally threadedly connected to the upper end of the pressure-holding overflow pipe 6. The expansion pipe 13 facilitates adjusting the height between the upper opening of the pressure-holding overflow pipe 6 and the bottom plate of the water storage tank 1, thereby adjusting the air supply pressure of the storage tank.

[0047] In this embodiment, a limiting ring plate 14 is provided at the upper end of the expansion pipe 13. The limiting ring plate 14 limits the downward adjustment range of the expansion pipe 13, preventing the expansion pipe 13 from being difficult to take out after being screwed into the pressure-holding overflow pipe 6; handle 15 are provided on both sides of the limiting ring plate 14, and the handle 15 facilitates the quick adjustment of the expansion pipe 13 without tools.

[0048] In this embodiment, the overflow tank 4 is made of a transparent material, and a scale line 5 is provided on one side of the overflow tank 4, which is convenient for judging the position of the adjusting plate 7, thereby judging the pressure relief pressure of the storage tank.

[0049] In this embodiment, an adjusting plate 7 is provided inside the overflow tank 4. The bottom of the pressure-holding overflow pipe 6 is installed on the adjusting plate 7, and a plurality of notches are provided at the bottom of the pressure-holding overflow pipe 6. A screw rod 8 is provided at the lower part of the adjusting plate 7, and the screw rod 8 is threadedly connected to the bottom plate of the overflow tank 4. A hand wheel 9 is provided at the lower end of the screw rod 8; according to the internal pressure-bearing capacity of the storage tank, the hand wheel 9 is rotated to adjust the height L3 between the pressure relief pipe 11 and the lower opening of the pressure-holding overflow pipe 6, thereby adjusting the pressure relief pressure of the storage tank and expanding the applicable range of the micro-pressure guarantee device.

[0050] In this embodiment, the length L1 of the air inlet pipe 10 is greater than the liquid level height L3 between the pressure relief pipe 11 and the bottom of the pressure-holding overflow pipe 6. When the internal pressure of the storage tank is greater than 12 KPa, the pressure-holding overflow pipe 6 discharges pressure externally, and the static pressure of the liquid level in the air inlet pipe 10 is greater than the pressure relief pressure of the overflow tank 4, preventing the fluid from being discharged from the upper opening of the air inlet pipe 10.

[0051] In this embodiment, the volume V of the overflow tank 4 B is greater than twice the internal volume V of the pressure-holding overflow pipe 6 b . When the pressure of the storage tank is greater than 12 KPa and the pressure relief is completed, and the internal pressure of the storage tank is equal to 0 kPa, it is ensured that the space between the upper opening of the pressure-holding overflow pipe 6 and the bottom plate of the water storage tank 1 is still full of liquid; when the pressure of the storage tank is less than -0.3 KPa, when the overflow tank 4 further injects liquid into the pressure-holding overflow pipe 6, the overflow tank 4 will not suck in air, ensuring the accuracy of the pressure-holding device.

[0052] In this embodiment, the liquid seal volume Vc formed between the upper opening of the pressure-holding overflow pipe 6 and the bottom plate of the water storage tank 1 is greater than the volume V of the air inlet pipe 10 d, when the internal pressure of the storage tank is greater than 12 KPa and the pressure-holding overflow pipe 6 discharges pressure externally, the liquid injection height of the fluid between the upper opening of the pressure-holding overflow pipe 6 and the bottom plate of the water storage tank 1 into the air inlet pipe 10 is 1200 mm. After the liquid injection, the liquid-sealing fluid will not be sucked empty, ensuring the accuracy of the pressure-holding device.

[0053] The above content is only an example and description of the structure of the present invention. Those skilled in the art of this technology can make various modifications, supplements, or use similar methods to replace the specific embodiments described. As long as they do not deviate from the structure of the invention or exceed the scope defined by this claim book, they should fall within the protection scope of the present invention.

Claims

1. A micro-pressure maintaining device for a large storage tank, comprising a water storage tank and an overflow tank, characterized in that, One side of the upper part of the water storage tank is provided with a water inlet pipe, and the upper end of the water inlet pipe is provided with a connecting flange, and the connecting flange is detachably connected with the overflow pipe of the storage tank. The lower part of the water storage tank is provided with an overflow tank, and a pressure-keeping overflow pipe is arranged inside the overflow tank. The pressure-keeping overflow pipe passes through the water storage tank and its upper opening is higher than the bottom plate of the water storage tank. The space between the upper opening of the pressure-keeping overflow pipe and the bottom of the water storage tank forms a liquid seal volume. One side of the upper part of the overflow tank is provided with a pressure relief pipe, and one end of the pressure relief pipe is connected with the sewage pool; One side of the upper part of the water storage tank is provided with an air inlet pipe, and the lower end of the air inlet pipe is lower than the upper opening of the pressure-keeping overflow pipe, and the lower end of the air inlet pipe does not contact the bottom plate of the water storage tank; The upper end of the pressure-keeping overflow pipe is internally threadedly connected with a telescopic pipe; A limit ring plate is arranged at the upper end of the telescopic pipe, and handles are arranged on both sides of the limit ring plate; An adjusting plate is arranged inside the overflow tank, the bottom of the pressure-keeping overflow pipe is installed on the adjusting plate, and a plurality of notches are arranged at the bottom of the pressure-keeping overflow pipe. A screw rod is arranged at the lower part of the adjusting plate, the screw rod is threadedly connected with the bottom plate of the overflow tank, and a hand wheel is arranged at the lower end of the screw rod; The length L1 of the air inlet pipe is greater than the liquid level height L3 between the pressure relief pipe and the bottom of the pressure-keeping overflow pipe; The volume V of the overflow tank B is greater than twice the internal volume V of the pressure-keeping overflow pipe b ; The liquid seal volume Vc formed between the upper opening of the pressure-keeping overflow pipe and the bottom plate of the water storage tank is greater than the volume V of the air inlet pipe d .

2. The micro-pressure maintaining device for a large storage tank according to claim 1, wherein A filter screen is provided on the upper part of the intake pipe.

3. The micro-pressure maintaining device for a large storage tank according to claim 1, characterized in that, A check valve is provided on the pressure relief pipe.

4. A micro-pressure maintaining device for a large storage tank according to claim 1, characterized in that, The overflow tank is made of a transparent material, and scale lines are provided on one side of the overflow tank.

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