Water hammer eliminating tank

Abstract

The utility model discloses a water hammer eliminating tank, which relates to the technical field of water delivery pipelines and comprises a first chamber, a second chamber and an air intake and exhaust unit, the air intake and exhaust unit is provided with an air intake passage and an air exhaust passage, and the first chamber and the second chamber are communicated through the air intake passage and the air exhaust passage. The cross sectional area of the air inlet channel is larger than that of the exhaust channel, and when the difference value obtained by subtracting the pressure of the first cavity from the pressure of the second cavity is not larger than the preset pressure difference, the air inlet channel is closed; when the difference value obtained by subtracting the pressure of the first cavity from the pressure of the second cavity is larger than the preset pressure difference, the air inlet channel is opened, and the air inlet and outlet unit further comprises a shut-off valve element which is arranged at the position of the air outlet channel and closes the air outlet channel when the first cavity is filled with liquid. The water hammer eliminating tank can absorb pressure boosting water hammers generated by an external water path and supplement pressure for pressure reducing water hammers generated by the external water path, and a good pipeline water hammer protection effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to water pipeline technical field especially a water hammer elimination tank. BACKGROUND

[0002] In the water pipeline system, when unexpected situations such as the sudden stop of the delivery pump or the sudden closing of the valve in the pipeline occur, the transient state of the sharp change of the flow and pressure of the fluid in the pipeline will appear, which is called water hammer. When water hammer occurs, the sharp change of the flow of the fluid in the pipeline will cause the propagation of the pressure wave, resulting in the rapid rise / fall of the pressure in the pipeline, and even the pipeline may collapse or be damaged due to the pressure wave.

[0003] In order to reduce or avoid the loss caused by water hammer hazards, a water hammer protection device such as a water hammer elimination tank or a bidirectional pressure regulating tower is generally used in the pump water pipeline system, which can relieve the excessive pressure in the pipeline by supplementing the pressure in the pipeline and absorbing water in the pipeline, thereby reducing the water hammer phenomenon caused by the sharp change of the flow of the fluid in the pipeline.

[0004] Among them, the existing water hammer elimination tank is usually a pressure tank with an elastic inner container, which can expand and absorb water when the external pipeline pressure is too high by pre-charging the pressure compression gas between the inner container and the tank body to extrude the inner container, and when the external pipeline pressure is low, the compression gas extrudes the inner container to supplement the water and pressurize the external pipeline, thereby offsetting the pressure fluctuation of the water in the external pipeline. However, on the one hand, the inner container needs to be made of elastic pressure-bearing material, which is expensive, resulting in high cost of the water hammer elimination tank, and on the other hand, the inner container has the risk of rupture when absorbing the excessive pressure in the pipeline, resulting in failure of the water hammer elimination tank to protect the pipeline.

[0005] To this end, patent CN112066260B provides a pressure tank, which is divided into a first liquid cavity and a first gas cavity by a partition, the partition is provided with a through hole, and a first plugging member is arranged to plug or unplug the through hole, i.e. the pressure tank provides a water hammer elimination tank without an inner container. However, the first plugging member in this structure plugs the through hole as the liquid level rises, and when the tank body and the pipeline are filled with water, the liquid level in the first liquid cavity of the pressure tank rises quickly, which may cause water hammer damage to the pressure tank, and the first gas cavity may be filled with water due to the delayed response of the plugging member. UTILITY MODEL CONTENTS

[0006] The utility model provides a kind of water hammer elimination tank, its purpose is to overcome the above-mentioned problems existing in prior art.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] The utility model provides a water hammer elimination tank, including first chamber, second chamber and air intake and exhaust unit, wherein, first chamber is equipped with inlet and outlet water, second chamber is equipped with pressure regulating port, and second chamber is filled with positive pressure gas, air intake and exhaust unit has air inlet channel and exhaust channel, and first chamber and second chamber are communicated through air inlet channel and exhaust channel, the cross section area of air inlet channel is larger than the cross section area of exhaust channel, when the pressure difference of second chamber minus first chamber is not larger than preset pressure difference, air inlet channel is closed, when the pressure difference of second chamber minus first chamber is larger than preset pressure difference, air inlet channel is opened, and the air intake and exhaust unit still includes shut -off valve core, is arranged at exhaust channel, and when first chamber is filled with liquid, exhaust channel is closed.

[0009] According to the technical scheme of the utility model, first, by filling the second chamber with positive pressure gas and the first chamber not being filled with water, the first chamber and the second chamber are communicated, and when the first chamber is filled with water, the first chamber and the second chamber are cut off, so that the pressure rise water hammer generated by the external waterway can be absorbed and the pressure drop water hammer generated by the external waterway can be compensated, thereby achieving good pipeline water hammer protection effect.

[0010] Then, by setting two channels (air inlet channel and exhaust channel) with different cross sections to communicate the first chamber and the second chamber, and when the pressure drop water hammer occurs in the external waterway, the air inlet channel with the larger cross section is kept open to ensure that the pressure in the external waterway can be quickly and timely compensated, and when the pressure rise water hammer occurs in the external waterway, the air inlet channel with the larger cross section is closed, and the exhaust channel with the smaller cross section is kept open, so that the gas in the first chamber cannot be quickly discharged into the second chamber, thereby avoiding the generation of pressure rise water hammer due to the rapid rise of liquid level and the filling of the first chamber, and thus having better protection effect on the pressure rise water hammer.

[0011] Finally, for the case of rapid rise of liquid level in the first chamber, such as filling the waterway and the water hammer elimination tank with water, only the exhaust channel with the smaller cross section is used for exhaust, which can reduce the rising speed of liquid level in the first chamber, so that the shut-off valve core can respond in time to close the exhaust channel when the first chamber is filled with water, thereby reducing the risk of liquid in the first chamber entering the second chamber.

[0012] As a preferred technical scheme, the air intake and exhaust unit includes a one-way air intake device, which is arranged at the air inlet channel. The one-way air intake device includes a valve seat, a sealing valve flap, and a resilient normally closed mechanism. The valve seat is fixed in the air inlet channel, and a valve seat inlet is formed in the middle of the valve seat. The sealing valve flap is arranged on the side of the valve seat close to the first chamber and tightly seals the valve seat inlet. The resilient normally closed mechanism includes a resilient member and a pull rod. The resilient member is fixed on one side of the valve seat, and the pull rod is fixed at one end of the resilient member and at the other end of the sealing valve flap through the valve seat inlet, so that the sealing valve flap is tightly pressed against the valve seat inlet.

[0013] According to the preferred technical scheme, when the pressure in the first chamber rises to a value that is less than or equal to the elastic force of the elastic member on the sealing valve flap, the elastic member remains contracted, pressing the sealing valve flap against the inlet of the valve seat, and the air inlet channel remains closed; when the pressure in the first chamber decreases to a value that is greater than the elastic force of the elastic member on the sealing valve flap, the elastic member stretches, and the sealing valve flap moves away from the valve seat, thereby opening the air inlet channel. In this way, when the pressure in the first chamber decreases to a certain extent, the one-way air inlet device can automatically respond and open.

[0014] As a preferred technical scheme, the inner diameter of the air outlet channel is 1.6-5 mm.

[0015] According to the preferred technical scheme, if the inner diameter of the air outlet channel is too large, it cannot achieve the technical effect of slow air exhaust; if the inner diameter of the air outlet channel is too small, the air in the first chamber cannot be exhausted in time, which may cause overpressure in the first chamber. By setting the inner diameter of the air outlet channel to be in the range of 1.6-5 mm, the slow air exhaust effect can be achieved while ensuring the reliability of the pressure bearing of the first chamber.

[0016] As a preferred technical scheme, the shut-off valve core includes a valve flap and a float. The air outlet channel has an air outlet, and the valve flap is arranged on the side of the air outlet facing the direction of gravity. The float is linked with the valve flap and applies its own gravity to the valve flap. When the liquid level rises to the position of the float, the float rises with the liquid level and drives the valve flap to press against the air outlet.

[0017] According to the preferred technical scheme, the shut-off valve core can automatically respond and close the air outlet channel as the liquid level rises, without the need for additional communication control, and has a fast response speed and a low failure risk.

[0018] As a preferred technical scheme, the air outlet channel is formed in a manner that penetrates the sealing valve flap, and the shut-off valve core is arranged on the side of the sealing valve flap facing the direction of gravity.

[0019] According to the preferred technical scheme, the one-way air inlet unit, the air outlet channel, and the shut-off valve core are integrated into one whole, which is convenient to install and has a more compact structure.

[0020] As a preferred technical scheme, the water hammer elimination tank further includes a pressure regulating unit that is in communication with the pressure regulating port and is used to charge / discharge air into the second chamber to regulate the pressure in the second chamber. The pressure regulating unit can keep the air pressure in the second chamber stable when the air pressure in the second chamber fluctuates.

[0021] As a preferred technical scheme, the water hammer elimination tank includes a tank body, and the tank body is divided into the first chamber and the second chamber by a partition plate.

[0022] According to the preferred technical scheme, two independent chambers are formed by only one tank body separation, so that the structure of the water hammer elimination tank is more compact.

[0023] As the preferred technical scheme, the water hammer elimination tank comprises a first tank body and a second tank body arranged independently, the first tank body is internally provided with a first chamber, the second tank body is internally provided with a second chamber, the first tank body and the second tank body are communicated through an air inlet and outlet pipeline, and an air inlet and outlet unit is arranged at the air inlet and outlet pipeline.

[0024] According to the preferred technical scheme, by arranging two independent pressure-bearing tanks, the water hammer elimination tank is more suitable for a scene requiring a larger volume, and without welding a partition plate, the sealing between the two chambers is more reliable.

[0025] As the preferred technical scheme, the first tank body and the second tank body are arranged in a vertical direction, and the second tank body is arranged above the first tank body, or the first tank body and the second tank body are arranged adjacent to each other in a horizontal direction.

[0026] As the preferred technical scheme, the water hammer elimination tank further comprises a safety valve, and the safety valve is correspondingly communicated with the first chamber and the second chamber.

[0027] According to the preferred technical scheme, two safety valves are correspondingly communicated with the first chamber and the second chamber respectively, so that the overall safety of the water hammer elimination tank is improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a structure schematic view of a water hammer elimination tank provided by an embodiment of the utility model;

[0029] Figure 2 and Figure 3 is different situation that the first chamber and the second chamber are arranged in two independent tank bodies provided by an embodiment of the utility model;

[0030] Figures 4-7 is a structure schematic view of four different air inlet and outlet units provided by an embodiment of the utility model.

[0031] MARKS OF THE DRAWINGS:

[0032] 1-first chamber, 11-water inlet and outlet;

[0033] 2-second chamber, 21-pressure regulating port;

[0034] 3 - air intake and exhaust unit, 31 - air intake passage, 32 - air exhaust passage, 321 - air exhaust port, 33 - shut-off valve core, 331 - valve disc, 332 - float, 34 - one-way air intake device, 341 - valve seat, 342 - sealing valve disc, 343 - elastic member, 344 - pull rod, 35 - first housing, 36 - second housing, 37 - communication pipe, 38 - bypass pipe;

[0035] 4 - partition; 5 - first tank body; 6 - second tank body; 7 - air intake and exhaust pipe; 8 - safety valve. DETAILED DESCRIPTION

[0036] The utility model will be described in further detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all the structures.

[0037] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0038] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0039] In the description of the embodiment, the terms "up", "down", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation of the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0040] Figure 1 is a structural schematic view of a water hammer elimination tank provided by the embodiment of the present application. In combination Figure 1 , the water hammer elimination tank comprises two chambers (a first chamber 1 and a second chamber 2), and the two chambers are independently arranged and communicated via an air inlet and outlet unit 3.

[0041] Among them, the first chamber 1 is provided with a water inlet and outlet 11, which is communicated with the external pipeline, used for supplementing liquid to the external pipeline, or containing overpressure liquid in the external pipeline, the water inlet and outlet 11 can be arranged at any part of the first chamber 1, in order to prevent water from splashing when entering the chamber, the water inlet and outlet 11 can be arranged at the bottom of the first chamber 1. The second chamber 2 is provided with a pressure regulating port 21, and the second chamber 2 can contain positive pressure gas, the positive pressure gas can be filled into the second chamber 2 through the pressure regulating port 21, and the pressure regulating port 21 can be used for air release to maintain the stable air pressure in the second chamber 2. Preferably, a pressure regulating unit can be communicated outside the second chamber 2, the pressure regulating unit can be a pressure increasing mechanism, such as an air compressor, which can increase the pressure of the second chamber 2 when the gas pressure in the second chamber 2 is insufficient.

[0042] It should be noted that Figure 1 The above method can form two independent chambers by separating one tank body with a partition plate 4, and further, the partition plate 4 is provided with a hole, and the air inlet and outlet unit 3 is arranged at the hole of the partition plate 4, so that the structure of the water hammer elimination tank is more compact. However, the present application is not limited to this, the first chamber 1 and the second chamber 2 can also be arranged in independent tank bodies, and the arrangement between the two tank bodies is not limited herein. For example, the two tank bodies can be arranged horizontally, inclinedly or vertically, which all belong to the protection scope of the present application.

[0043] Figure 2 And Figure 3 respectively show different cases that the first chamber 1 and the second chamber 2 are arranged in two independent tank bodies, and the first chamber 1 and the second chamber 2 are arranged in two independent tank bodies (a first tank body 5 and a second tank body 6), which is more suitable for the scene that a water hammer elimination tank with larger volume is needed, and the partition plate 4 does not need to be welded, and the sealing between the two chambers is more reliable. Herein, the tank body where the first chamber 1 is located is taken as the first tank body 5, and the tank body where the second chamber 2 is located is taken as the second tank body 6. According to the actual installation environment requirements, as shown in Figure 2 , the first tank body 5 and the second tank body 6 can be arranged horizontally, and the top of the first tank body 5 and the second tank body 6 is communicated by an air inlet and outlet pipeline 7, the air inlet and outlet pipeline 7 is a pressure-bearing pipe, and the air inlet and outlet unit 3 can be arranged at the air inlet and outlet pipeline 7.

[0044] Or, as shown inFigure 3 As shown, the first tank body 5 and the second tank body 6 can also be stacked along the direction of gravity, specifically, the second tank body 6 can be arranged above the first tank body 5, and the top of the first tank body 5 and any part of the second tank body 6 are communicated through the air inlet and outlet pipeline 7, for example, the air inlet and outlet pipeline 7 is communicated with the middle of the side of the second tank body 6, in this way, the air inlet and outlet unit 3 can be arranged on one side of the second tank body 6, so that the upper and lower structures of the first tank body 5 and the second tank body 6 are more compact, and the height of the overall device is reduced, and in other embodiments, the top of the first tank body 5 and the bottom of the second tank body 6 can also be communicated, and the air inlet and outlet unit 3 is arranged between the stacked first tank body 5 and the second tank body 6, which can reduce the length of the pressure-bearing pipe and improve the overall pressure-bearing reliability of the device.

[0045] Further, since it is a pressure vessel containing pressure gas inside, the water hammer elimination tank generally needs to be provided with a safety valve 8, and considering that the water hammer elimination tank in the embodiment has two pressure chambers (the first chamber 1 and the second chamber 2), two safety valves 8 can be provided and arranged in communication with the first chamber 1 and the second chamber 2, respectively, so as to improve the overall safety of the water hammer elimination tank.

[0046] As shown in the drawings, Figure 4 The air inlet and outlet unit 3 has an air inlet passage 31 and an air outlet passage 32, and the air inlet passage 31 and the air outlet passage 32 are two parallel flow channels, and the first chamber 1 and the second chamber 2 are communicated through the air inlet passage 31 and the air outlet passage 32, that is, the first chamber 1 and the second chamber 2 can be individually communicated by the air inlet passage 31 and can be individually communicated by the air outlet passage 32. Specifically, when the difference between the pressure of the second chamber 2 and the pressure of the first chamber 1 is not greater than a preset pressure difference, the air inlet passage 31 is closed; when the difference between the pressure of the second chamber 2 and the pressure of the first chamber 1 is greater than the preset pressure difference, the air inlet passage 31 is opened.

[0047] Further, the air inlet and outlet unit 3 further comprises a shut-off valve core 33 arranged at the air outlet passage 32, which closes the air outlet passage 32 when the first chamber 1 is full of liquid. The specific structure of the shut-off valve core 33 is not limited here, and any valve core that can achieve the closing of the air outlet passage 32 when the first chamber 1 is full of liquid is suitable for the utility model, for example, in some embodiments, the shut-off valve core 33 can be a floating ball, and the gas cannot make the floating ball float, but the rising liquid surface can make the floating ball float to close the air outlet passage 32, so as to achieve the closing of the air outlet passage 32 when the first chamber 1 is full of liquid. Alternatively, in other embodiments, the shut-off valve core 33 can be an electronic control valve and a liquid level sensor, and when it is detected that the liquid level of the first chamber 1 reaches the top, the electronic control valve closes the air outlet passage 32, all of the above belong to the protection scope of the utility model.

[0048] When the pressure in the first chamber 1 decreases, for example, when the water pump suddenly stops, the pressure in the first chamber 1 decreases until the difference between the pressure in the second chamber 2 and the pressure in the first chamber 1 is greater than the preset pressure difference, that is, when the pressure in the first chamber 1 decreases to the point that the pressure difference between the second chamber 2 and the first chamber 1 is greater than the preset pressure difference, the inlet passage 31 is opened. At this time, the exhaust passage 32 is also kept open because the liquid in the first chamber 1 is not full. The gas in the second chamber 2 with pressure enters the first chamber 1 through the inlet passage 31 and the exhaust passage 32, and pushes the water in the first chamber 1 towards the water inlet and outlet 11, so that the water in the first chamber 1 is replenished into the external waterway, thereby increasing the pressure in the external waterway and reducing the pressure drop caused by the pump stop.

[0049] When the pressure in the first chamber 1 increases, for example, after a part of the liquid is transmitted to the first chamber 1 in the form of a pressure wave due to the occurrence of a pressure drop water hammer, the pressure in the first chamber 1 increases. When the difference between the pressure in the second chamber 2 and the pressure in the first chamber 1 is less than or equal to the preset pressure difference, that is, when the pressure in the first chamber 1 increases to the point that the pressure difference between the first chamber 1 and the second chamber 2 is less than or equal to the preset pressure value, the inlet passage 31 is closed. Before the liquid level in the first chamber 1 rises to fill the first chamber 1, the exhaust passage 32 remains open. The liquid level in the first chamber 1 rises and pushes the gas in the first chamber 1 back into the second chamber 2 through the exhaust passage 32. Until the liquid level in the first chamber 1 rises to fill the first chamber 1, the spool 33 closes the exhaust passage 32, so that the first chamber 1 and the second chamber 2 are completely separated. In this process, the gas in the second chamber 2 with pressure absorbs the high pressure energy of the pressure wave, which can eliminate the pressure rise caused by the pressure wave, so that the water hammer elimination tank provided in the embodiment can automatically complete the water hammer protection work.

[0050] In particular, in the present embodiment, the cross-sectional area of the air inlet passage 31 is greater than that of the air outlet passage 32, so that when the pressure in the first chamber 1 decreases to a value greater than the preset pressure difference, the air inlet passage 31 is opened, and the gas in the second chamber 2 rushes into the first chamber 1 through the air inlet passage 31 and the air outlet passage 32, so that the external waterway can be quickly pressurized. When the pressure in the first chamber 1 increases to a value less than or equal to the preset pressure value, the air inlet passage 31 is closed, and the gas in the first chamber 1 is only discharged through the air outlet passage 32. Since the cross-sectional area of the air outlet passage 32 is small, the gas in the first chamber 1 cannot be quickly discharged, especially for the case of rapid rise of the liquid level in the first chamber 1, such as when the waterway and the water hammer elimination tank are filled with water. Since the air in the first chamber 1 can only be slowly discharged, a high-pressure air bag can be formed at the top of the first chamber 1, reducing the rising speed of the liquid level in the first chamber 1, thereby preventing the generation of pressure rise water hammer in the first chamber 1, protecting the water hammer elimination tank, and the valve core 33 can timely respond to close the air outlet passage 32 when the first chamber 1 is filled with water.

[0051] The size and shape of the air outlet passage 32 are not limited herein, and the inner diameter of the air outlet passage 32 is optionally in the range of 1.6-5 mm. If the inner diameter of the air outlet passage 32 is too large, the technical effect of fast inlet and slow outlet cannot be achieved, and if the inner diameter of the air outlet passage 32 is too small, the air in the first chamber 1 cannot be discharged in time, which can easily lead to overpressure of the first chamber 1. By setting the inner diameter of the air outlet passage 32 in the range of 1.6-5 mm, the pressure-bearing reliability of the first chamber 1 can be ensured while achieving the effect of fast inlet and slow outlet.

[0052] It should be noted that the preset pressure value is not limited herein and can be freely selected by those skilled in the art according to the needs. In some embodiments, the preset pressure value can be set to 0, i.e., the air inlet passage 31 is closed when the pressure in the second chamber 2 is not greater than that in the first chamber 1, and the air inlet passage 31 is opened when the pressure in the second chamber 2 is greater than that in the first chamber 1. In other embodiments, a sealing valve flap 342 is provided at the air inlet passage 31, which is pressed tightly by an elastic member 343 (e.g., a spring), so that only the pressure difference between the pressure in the second chamber 2 and the pressure in the first chamber 1 can overcome the elastic force of the elastic member 343 to open the sealing valve flap 342. Therefore, those skilled in the art can adjust the preset pressure value by controlling the elastic force of the elastic member 343.

[0053] In this embodiment, firstly, the second chamber 2 is filled with pressurized gas, and when the first chamber 1 is not filled with water, the first chamber 1 and the second chamber 2 are connected. When the first chamber 1 is filled with water, the first chamber 1 and the second chamber 2 are disconnected. This allows for the absorption of the pressure-increasing water hammer generated by the external water circuit and the replenishment of the pressure-depressurizing water hammer generated by the external water circuit, thus providing excellent protection against water hammer in the pipeline.

[0054] Then, by setting two channels with different cross-sections (intake channel 31 and exhaust channel 32) to connect the first chamber 1 and the second chamber 2, and when a depressurization water hammer occurs in the external water circuit, the intake channel 31 with a larger cross-section is kept open to ensure that the pressure in the external water circuit can be quickly and timely replenished. When a pressure-increasing water hammer occurs in the external water circuit, the intake channel 31 with a larger cross-section is closed, while the exhaust channel 32 with a smaller cross-section is kept open. The gas in the first chamber 1 cannot be quickly discharged into the second chamber 2, thereby avoiding the generation of pressure-increasing water hammer due to the rapid rise of the liquid level and filling of the first chamber 1, thus providing a better protection against pressure-increasing water hammer.

[0055] Finally, in the case of a rapid rise in the liquid level in the first chamber 1, such as when filling the water circuit and water hammer elimination tank with water, venting only through the venting channel 32 with a smaller cross-section can reduce the rate of rise of the liquid level in the first chamber 1. Thus, the shut-off valve core 33 can respond in time to close the venting channel 32 when the first chamber 1 is filled with water, reducing the risk of liquid in the first chamber 1 entering the second chamber 2.

[0056] Figures 4-7 Examples of four different intake and exhaust unit 3 structures are shown below. The following, in conjunction with... Figures 4-7 The following examples illustrate the one-way intake device 34 and shut-off valve core 33 structures of four different intake and exhaust units 3 in more detail. Other structures not described are the same as those above and will not be repeated here.

[0057] like Figures 4-7 As shown, a one-way air intake device 34 is disposed at the air intake channel 31. The one-way air intake device 34 includes a valve seat 341, a sealing valve disc 342, and a resilient normally closed mechanism. The valve seat 341 is fixed within the air intake channel 31, with a valve seat inlet in the middle. The sealing valve disc 342 is disposed on the side of the valve seat 341 near the first chamber 1, and is pressed tightly against the valve seat inlet to seal it. The resilient normally closed mechanism includes an elastic element 343 and a pull rod 344. The elastic element 343 is fixed to one side of the valve seat 341. One end of the pull rod 344 is fixed to the elastic element 343, and the other end passes through the valve seat inlet and is fixed to the sealing valve disc 342, so that the sealing valve disc 342 is pressed tightly against the valve seat inlet.

[0058] Specifically, when the pressure in the first chamber 1 rises to a point where the pressure difference between the second chamber 2 and the first chamber 1 is less than or equal to the elastic force of the elastic element 343 on the sealing valve disc 342, the elastic element 343 remains contracted, pressing the sealing valve disc 342 against the valve seat inlet, and the air intake passage 31 remains closed; when the pressure in the first chamber 1 decreases to a point where the pressure difference between the second chamber 2 and the first chamber 1 is greater than the elastic force of the elastic element 343 on the sealing valve disc 342, the elastic element 343 stretches, the sealing valve disc 342 leaves the valve seat 341, and thus the air intake passage 31 opens.

[0059] The shut-off valve core 33 includes a valve disc 331 and a float 332. The accompanying drawings illustrate a float ball as an example, but other shapes of floats 332 are also applicable to this invention. The exhaust channel 32 has an exhaust port 321, and the valve disc 331 is located on the side of the exhaust port 321 facing the direction of gravity. The float 332 is linked to the valve disc 331 and applies its own weight to the valve disc 331. When the liquid level rises to the position of the float 332, the float 332 rises with the liquid level, causing the valve disc 331 to press against the exhaust port 321. This shut-off valve core 33 can automatically respond as the liquid level rises, without the need for additional communication control, exhibiting fast response speed and low failure risk.

[0060] like Figure 2 and 4 As shown, the intake passage 31 and the one-way intake unit can be housed within the first housing 35, while the shut-off valve core 33 and the exhaust passage 32 can be housed within the second housing 36. The bottom of the first housing 35 is connected to the first chamber 1, and the top of the first housing 35 is connected to the second chamber 2. The lower middle part of the second housing 36 is connected to the lower middle part of the first housing 35 via a connecting pipe 37, and the top of the second housing 36 is connected to the top of the first housing 35 via a bypass pipe 38. This allows for separate repair and replacement of the one-way intake unit and the shut-off valve core 33, facilitating future maintenance.

[0061] like Figure 5 As shown, the intake passage 31 and the one-way intake unit, the exhaust passage 32 and the shut-off valve core 33 can also be housed within the first housing 35. The exhaust passage 32 is formed to pass through the sealing valve disc 342, and the shut-off valve core 33 is positioned correspondingly to the exhaust passage 32 on the side of the sealing valve disc 342 facing the direction of gravity. Integrating the intake passage 31, exhaust passage 32, one-way intake unit, and shut-off valve core 33 into the same housing allows for easy installation and a more compact structure, as both ends of the housing can be directly connected to the connecting pipe between the first chamber 1 and the second chamber 2 via two flanges.

[0062] For a water hammer elimination tank that has only one tank body, and where the first chamber 1 and the second chamber 2 are separated by a partition 4, such as Figure 6As shown, a through hole can be formed on the partition plate 4 as the air inlet passage 31, and the air outlet passage 32 is formed in a manner of penetrating the sealing valve disc 342, like Figure 7 As shown, two through holes with different inner diameters can be formed on the partition plate 4 as the air inlet passage 31 and the air outlet passage 32, the one-way air inlet unit is correspondingly arranged at the air inlet passage 31, and the shut-off valve core 33 is arranged in the air outlet passage 32, without the need of additionally arranging the pressure bearing shell, and the structure is simple.

[0063] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. Here, it is unnecessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A water hammer arrestor characterized by, The utility model relates to a pressure regulating device, comprising: a first chamber (1) having an inlet and outlet (11); a second chamber (2) having a pressure regulating port (21), the second chamber (2) being filled with a positive pressure gas; an air inlet and outlet unit (3) having an air inlet channel (31) and an air outlet channel (32), the first chamber (1) and the second chamber (2) being connected via the air inlet channel (31) and the air outlet channel (32), the cross-sectional area of the air inlet channel (31) being greater than that of the air outlet channel (32), when the pressure difference between the second chamber (2) and the first chamber (1) is not greater than a preset pressure difference, the air inlet channel (31) is closed; when the pressure difference between the second chamber (2) and the first chamber (1) is greater than a preset pressure difference, the air inlet channel (31) is opened, the air inlet and outlet unit (3) further comprising a shut-off valve core (33) arranged at the air outlet channel (32), the shut-off valve core (33) being closed when the first chamber (1) is filled with liquid.

2. The water hammer arrestor of claim 1, wherein, the air inlet and outlet unit (3) comprising a one-way air inlet device (34) arranged at the air inlet channel (31), the one-way air inlet device (34) comprising: a valve seat (341) fixed in the air inlet channel (31), the valve seat (341) having a valve seat inlet in the middle; a sealing valve clack (342) arranged at one side of the valve seat (341) close to the first chamber (1), the sealing valve clack (342) being tightly sealed with the valve seat inlet; a resilient normally closed mechanism comprising a resilient member (343) and a pull rod (344), the resilient member (343) being fixed at one side of the valve seat (341), the pull rod (344) being fixed at one end of the resilient member (343) and at the other end of the sealing valve clack (342), so that the sealing valve clack (342) is tightly sealed with the valve seat inlet.

3. The water hammer arrestor of claim 2, wherein, the inner diameter of the air outlet channel (32) being 1.6-5mm.

4. The water hammer arrestor of claim 2, wherein, the shut-off valve core (33) comprising: a valve clack (331) having an air outlet (321) in the air outlet channel (32), the valve clack (331) being arranged at one side of the air outlet (321) facing the direction of gravity; a float (332) linked with the valve clack (331) and applying its own gravity to the valve clack (331), when the liquid level rises to the position of the float (332), the float (332) rises with the liquid level, driving the valve clack (331) to be tightly sealed with the air outlet (321).

5. The water hammer arrestor of claim 4, wherein, the air outlet channel (32) being formed in a way that it penetrates the sealing valve clack (342), the shut-off valve core (33) being arranged at one side of the sealing valve clack (342) facing the direction of gravity.

6. The water hammer arrestor of any one of claims 1-5, wherein, further comprising: a pressure regulating unit connected with the pressure regulating port (21) for filling / emptying the second chamber (2) to regulate the pressure in the second chamber (2).

7. The water hammer arrestor of claim 6, wherein, the utility model comprising a tank, the tank being divided into the first chamber (1) and the second chamber (2) by a partition (4).

8. The water hammer arrestor of claim 6, wherein, The first tank body (5) and the second tank body (6) are arranged in a vertical direction along the gravity, and the second tank body (6) is arranged above the first tank body (5).

9. The water hammer arrestor of claim 8, wherein, Alternatively, the first tank body (5) and the second tank body (6) are arranged adjacent to each other in a horizontal direction. Further comprising:

10. The water hammer arrestor of any one of claims 1-5, wherein, A safety valve (8) is arranged in communication with the first chamber (1) and the second chamber (2) respectively. ​

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