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 a gas injection micro-discharge valve. Wherein the first chamber is provided with a water inlet / outlet, and the second chamber is provided with a pressure regulating port. The first cavity and the second cavity are communicated through a gas injection micro-exhaust valve, the gas injection micro-exhaust valve comprises a gas suction unit and a micro-exhaust unit, and the gas suction unit and the micro-exhaust unit are independently arranged and are communicated through a communicating pipe. According to the water hammer eliminating tank, through the effects of rapid air suction and slow exhaust of the air injection micro-exhaust valve, when the water hammer eliminating tank generates a boosting water hammer in an external water path, the air suction unit is closed, and the micro-exhaust unit slowly exhausts air in the first cavity; therefore, the situation that the liquid level rises rapidly and fills the first cavity to generate a boosting water hammer is avoided, and the boosting water hammer has a better protection effect.

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 gas injection micro -discharge valve, wherein, first chamber is equipped with inlet and outlet water, and second chamber is equipped with pressure regulating port.

[0009] According to the technical scheme of the utility model, first, by the second chamber is filled with gas with pressure, and, between the first chamber and the second chamber is provided with gas injection micro -discharge valve, when the first chamber is not filled with water, the first chamber and the second chamber are communicated, when the first chamber is filled with water, the first chamber and the second chamber are cut off, so that the pressure water hammer generated by external waterway can be absorbed and the pressure water hammer generated by external waterway can be pressure compensated, and good pipeline water hammer protection effect is played.

[0010] Then, by setting up the gas injection micro -discharge valve of fast -in slow -out, the first chamber and the second chamber are communicated, when the pressure water hammer occurs in the external waterway, the suction unit quickly inhales and pressure compensates, when the pressure water hammer occurs in the external waterway, the suction unit is closed, and the trace exhaust unit slowly discharges the gas in the first chamber, since the gas in the first chamber cannot be quickly discharged into the second chamber, thereby avoiding the pressure water hammer generated by the rapid rise of liquid level and the filling of the first chamber, thereby having better protection effect for the pressure water hammer.

[0011] Finally, for the case that the liquid level in the first chamber rises rapidly, for example, when the waterway and water hammer elimination tank are filled with water, only by slowly discharging the gas in the first chamber through the trace exhaust unit, the liquid level rising speed in the first chamber can be reduced, so that the first chamber can be filled with water in time, the trace exhaust valve is closed, and the risk of liquid in the first chamber entering the second chamber is reduced.

[0012] As a preferred technical scheme, the gas injection micro -discharge valve includes a first shell and a second shell. The first shell is provided with a suction unit, the bottom of the first shell is formed into a first opening, the first opening is communicated with the first chamber, and the top of the first shell is formed into a second opening, the second opening is communicated with the second chamber. The second shell is provided with a trace exhaust unit. One end of the communication pipe is communicated with the lower half of the first shell, the other end is communicated with the lower half of the second shell, and the inner diameter of the communication pipe is smaller than the inner diameter of the first opening.

[0013] According to the preferred technical scheme, the suction unit and the trace exhaust unit are placed in two shells respectively, so that the suction unit and the trace exhaust unit can be repaired and replaced separately, which is convenient for later maintenance. Moreover, the inner diameter of the communication pipe between the second shell and the first shell is smaller than the inner diameter of the first opening, so that the flow area (inner diameter of the communication pipe) when the gas is discharged through the trace exhaust unit can be reduced while ensuring that the flow area is large enough when the gas is inhaled through the suction unit.

[0014] As a preferred technical solution, the upper part of the second shell is communicated with the upper part of the first shell via a bypass pipe.

[0015] According to the preferred technical solution, the gas discharged by the trace exhaust can return to the second chamber, so that the total amount and pressure of the gas in the second chamber can still be kept stable in multiple water hammer buffering processes.

[0016] As a preferred technical solution, the air suction unit comprises an air inlet channel and a one-way air inlet device arranged at the air inlet channel, and the one-way air inlet device comprises a valve seat, a sealing valve flap and an elastic always-closed mechanism. The valve seat is fixed in the air inlet channel, 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 elastic always-closed mechanism comprises an elastic member and a pull rod, the elastic member is fixed on one side of the valve seat, one end of the pull rod is fixed to the elastic member and the other end penetrates through the valve seat inlet and is fixed to the sealing valve flap, so that the sealing valve flap is tightly pressed to the valve seat inlet.

[0017] According to the preferred technical solution, when the pressure difference between the second chamber and the first chamber is less than or equal to the elastic force of the elastic member on the sealing valve flap, the elastic member remains contracted, the sealing valve flap is tightly pressed to the valve seat inlet, and the air inlet channel remains closed; when the pressure in the first chamber decreases to a value greater than the elastic force of the elastic member on the sealing valve flap, the elastic member is stretched, the sealing valve flap is separated from the valve seat, and thus the air inlet channel is opened.

[0018] As a preferred technical solution, the trace exhaust unit comprises an exhaust channel and a shut-off valve core. The shut-off valve core is arranged at the exhaust channel, and when the first chamber is filled with liquid, the exhaust channel is closed.

[0019] According to the preferred technical solution, through the rapid response of the shut-off valve core, the liquid can be prevented from entering the second chamber, and the normal operation of the water hammer elimination tank can be ensured.

[0020] As a preferred technical solution, the cross-sectional area of the exhaust channel is smaller than that of the air inlet channel, and the inner diameter of the exhaust channel is 1.6-5 mm.

[0021] According to the preferred technical solution, if the inner diameter of the exhaust channel is too large, the technical effect of slow exhaust cannot be achieved, and if the inner diameter of the exhaust channel is too small, the air in the first chamber cannot be discharged in time, which is easy to cause overpressure in the first chamber. By setting the inner diameter of the exhaust channel to be 1.6-5 mm, the pressure-bearing reliability of the first chamber can be ensured, and the effect of slow exhaust can be achieved.

[0022] As a preferred technical scheme, the closing valve core comprises a valve disc and a float. The exhaust passage has an exhaust port, the valve disc is arranged on the side of the exhaust port facing the gravity direction, and the float is linked with the valve disc and applies its gravity to the valve disc. When the water level rises to the position of the float, the float rises with the water level and drives the valve disc to press against the exhaust port.

[0023] According to the preferred technical scheme, when the water level rises to the position of the float, the float rises with the water level and drives the valve disc to press against the exhaust port. When the liquid level rises to the position of the float, the float rises with the liquid level and drives the valve disc to press against the exhaust port. The closing valve core can automatically respond to the rising liquid level without additional communication control, has a fast response speed and a low failure risk.

[0024] As a preferred technical scheme, the water hammer elimination tank further comprises a pressure regulating unit in communication with the pressure regulating port and used for charging / discharging 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.

[0025] As a preferred technical scheme, the water hammer elimination tank comprises a tank body, and the tank body is divided into the first chamber and the second chamber by a partition plate. Two independent chambers are formed by only one tank body, so that the structure of the water hammer elimination tank is more compact.

[0026] As a preferred technical scheme, the water hammer elimination tank comprises independently arranged first and second tank bodies, the first tank body is internally provided with the first chamber, and the second tank body is internally provided with the second chamber. The first and second tank bodies are in communication via an air charging and discharging pipeline, and the air charging and discharging valve is arranged at the air charging and discharging pipeline. By arranging two independent pressure-bearing tanks, the water hammer elimination tank is more suitable for scenarios requiring a larger volume, and the two chambers are more reliably sealed without welding a partition plate. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic view of a water hammer elimination tank provided by an embodiment of the present application.

[0028] Figure 2 and Figure 3 is different cases in which the first chamber and the second chamber are arranged in two independent tank bodies provided by an embodiment of the present application.

[0029] Figure 4 is a structural schematic view of an air charging and discharging valve of a water hammer elimination tank provided by an embodiment of the present application.

[0030] MARKS OF THE DRAWINGS:

[0031] 1- first chamber, 11- water inlet and outlet;

[0032] 2 - second chamber, 21 - pressure regulating port;

[0033] 3 - gas injection micro-valve, 31 - gas inlet passage, 32 - gas outlet passage, 321 - gas outlet port, 33 - shut-off valve core, 331 - valve disc, 332 - float, 34 - one-way gas inlet 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;

[0034] 4 - partition plate; 5 - first tank body; 6 - second tank body; 7 - gas inlet and outlet pipeline; 8 - safety valve. DETAILED DESCRIPTION

[0035] 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 structures.

[0036] 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, or it can be the internal communication of two elements or the interaction relationship of 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.

[0037] 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 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.

[0038] In the description of the embodiments, the terms "upper", "lower", "left", "right", and the like, orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are 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 particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0039] First embodiment

[0040] Figure 1 is a structural schematic diagram of a water hammer elimination tank provided by an embodiment of the utility model. 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 a gas injection micro exhaust valve 3.

[0041] Wherein, the first chamber 1 is provided with an inlet and outlet water port 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 inlet and outlet water port 11 can be arranged at any part of the first chamber 1, in order to prevent water from splashing when entering the chamber, the inlet and outlet water port 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 second chamber 2 can be filled with positive pressure gas through the pressure regulating port 21, and the second chamber 2 can also be discharged through the pressure regulating port 21 to maintain the stability of the gas 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 pressurizes the second chamber 2 when the gas pressure in the second chamber 2 is insufficient.

[0042] It should be noted that, Figure 1 The first chamber 1 and the second chamber 2 are formed by the partition plate 4 in the embodiment, and two independent chambers can be formed by separating only one tank body by the above method, and further, the partition plate 4 is provided with a hole, and the micro exhaust unit can be 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 here. For example, the two tank bodies can be arranged horizontally, inclinedly or vertically, which all belong to the protection scope of the utility model.

[0043] Figure 2 and Figure 3The first chamber 1 and the second chamber 2 are respectively shown in different cases of being arranged in two independent tanks, and the first chamber 1 and the second chamber 2 are arranged in two independent tanks (a first tank 5 and a second tank 6). This is more suitable for scenarios in which a water hammer elimination tank with a larger volume is required, and the sealing between the two chambers is more reliable without welding the partition plate 4. Here, the tank in which the first chamber 1 is arranged is taken as the first tank 5, and the tank in which the second chamber 2 is arranged is taken as the second tank 6. According to actual installation environment requirements, as shown in Figure 2 , the first tank 5 and the second tank 6 can be arranged horizontally side by side, and the top of the first tank 5 and the top of the second tank 6 are connected by a pressure-bearing pipe. The trace exhaust unit can be arranged at the pressure-bearing pipe.

[0044] Alternatively, as shown in Figure 3 , the first tank 5 and the second tank 6 can be stacked along the direction of gravity. Specifically, the second tank 6 can be arranged above the first tank 5, and the top of the first tank 5 and any part of the second tank 6 are connected by a pressure-bearing pipe. In the figure, the pressure-bearing pipe is connected to the middle of the side of the second tank 6. In this way, the trace exhaust unit can be arranged on one side of the second tank 6, so that the upper and lower structures of the first tank 5 and the second tank 6 are more compact, and the height of the overall device is reduced. In other embodiments, the top of the first tank 5 and the bottom of the second tank 6 can be connected, and the trace exhaust unit can be arranged between the first tank 5 and the second tank 6 stacked in an upper and lower manner. This 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 container containing pressure gas inside, the water hammer elimination tank generally needs to be provided with a safety valve 8. 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 the two safety valves 8 are respectively arranged in communication with the first chamber 1 and the second chamber 2, so as to improve the overall safety of the water hammer elimination tank.

[0046] The air injection trace exhaust valve 3 includes an air suction unit and a trace exhaust unit, and the air suction unit and the trace exhaust unit are independently arranged and connected by a communication pipe 37. It can be understood by those skilled in the art that the air valve is a special valve used to prevent the negative pressure generated in the pipe by the decompression wave in the transient process. Air is sucked when the pressure in one side chamber is lower than the pressure in the other side chamber, and air is exhausted when the pressure in one side chamber rises higher than the pressure in the other side chamber. In the air exhaust process, the air valve can be automatically closed when the liquid in one side chamber is full, and the liquid is not allowed to be exhausted. The air injection trace exhaust valve 3 refers to an air valve capable of large air suction and trace air exhaust. In the present embodiment, the specific structure and type of the air injection trace exhaust valve 3 can be selected according to actual conditions, which is not limited here.

[0047] Specifically, when the external waterway pressure drops (for example, the water pump suddenly stops), the pressure in the first chamber 1 decreases, a pressure difference is formed between the first chamber 1 and the second chamber 2, when the pressure difference reaches a predetermined value, the air suction unit is opened, the pressurized gas in the second chamber 2 enters the first chamber 1, and the water in the first chamber 1 is pressed in the direction of the water inlet and outlet 11, so that the water in the first chamber 1 supplements into the external waterway, and the pressure in the external waterway is increased, and the pressure drop caused by the pump stop is reduced.

[0048] 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 after a pressure drop occurs, the pressure in the first chamber 1 increases, a pressure difference is formed between the first chamber 1 and the second chamber 2, when the pressure difference reaches a predetermined value, the air suction unit is closed, and the micro exhaust unit remains open, the liquid level in the first chamber 1 rises and the gas in the first chamber 1 is pressed back to the second chamber 2 by the micro exhaust unit. Until the liquid level in the first chamber 1 rises to fill the first chamber 1, the micro exhaust unit is closed, so that the first chamber 1 and the second chamber 2 are completely separated. In this process, the pressurized gas in the second chamber 2 absorbs the high pressure energy of the pressure wave, which can eliminate the pressure wave caused by the pressure wave.

[0049] In this embodiment, first, the second chamber 2 is filled with pressurized gas, and the gas injection micro exhaust valve 3 is arranged between the first chamber 1 and the second chamber 2, the first chamber 1 and the second chamber 2 are communicated when the first chamber 1 is not filled with water, and the first chamber 1 and the second chamber 2 are cut off when the first chamber 1 is filled with water, so that the pressure wave generated by the external waterway can be absorbed and the pressure drop generated by the external waterway can be compensated, and the pipeline water hammer protection effect is good.

[0050] Then, the gas injection micro exhaust valve 3 is arranged to communicate the first chamber 1 and the second chamber 2, the air suction unit quickly absorbs pressure when the external waterway generates a pressure drop, the air suction unit is closed when the external waterway generates a pressure wave, and the micro exhaust unit slowly exhausts the gas in the first chamber 1. Because the gas in the first chamber 1 cannot be quickly exhausted, a high-pressure air bag is formed at the top of the first chamber 1, the liquid level rising speed in the first chamber 1 is reduced, so that the pressure wave in the first chamber 1 can be prevented, the water hammer elimination tank can be protected, and the pressure wave has better protection effect.

[0051] Finally, for the case of rapid rise of the liquid level in the first chamber 1, for example, when the waterway and the water hammer elimination tank are filled with water, only by slowly discharging the gas in the first chamber 1 through the trace exhaust unit, the liquid level rising speed in the first chamber 1 can be reduced, so that the trace exhaust valve can be closed in time when the first chamber 1 is filled with water, and the risk of the liquid in the first chamber 1 entering the second chamber 2 is reduced.

[0052] Second embodiment

[0053] Compared with the first embodiment, the second embodiment of the utility model provides an optional structure of the air injection trace exhaust valve 3, and other unexplained structures are the same as those of the first embodiment, which will not be repeated here.

[0054] Figure 4 is the structure diagram of the air injection trace exhaust valve 3 provided by the second embodiment of the utility model. As shown in Figure 4 The air injection trace exhaust valve 3 optionally includes a first housing 35 and a second housing 36. The first housing 35 is internally provided with a gas suction unit, the bottom of the first housing 35 is formed into a first opening, the first opening is communicated with the first chamber 1, and the top of the first housing 35 is formed into a second opening, the second opening is communicated with the second chamber 2. The second housing 36 is internally provided with a trace exhaust unit. The communication pipe 37 is communicated with the lower half of the first housing 35 at one end and communicated with the lower half of the second housing 36 at the other end, and the inner diameter of the communication pipe 37 is smaller than the inner diameter of the first opening.

[0055] Through the above mode, the gas suction unit and the trace exhaust unit can be repaired and replaced separately, which is convenient for later maintenance. Moreover, the inner diameter of the communication pipe 37 between the second housing 36 and the first housing 35 is smaller than the inner diameter of the first opening, so that the flow area (i.e. the caliber of the first opening) of the gas inlet through the gas suction unit can be ensured to be large enough, while the flow area (the caliber of the communication pipe 37) of the gas exhaust through the trace exhaust unit can be reduced.

[0056] Further, the upper part of the second housing 36 and the upper part of the first housing 35 can also be communicated through the bypass pipe 38. The gas discharged by the trace exhaust can return to the second chamber 2, so that the total amount and pressure of the gas in the second chamber 2 can still be kept stable in the multiple water hammer buffering processes.

[0057] Hereinafter, the structures of the gas suction unit and the trace exhaust unit will be described in detail respectively with reference to the drawings.

[0058] [Gas suction unit]

[0059] Referring to Figure 4As shown, the air suction unit comprises an air inlet channel 31 and 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, a sealing valve flap 342 and a resilient normally closed mechanism. The valve seat 341 is fixed in the air inlet channel 31, and a valve seat inlet is formed in the middle of the valve seat 341. The sealing valve flap 342 is arranged on the side of the valve seat 341 close to the first chamber 1 and is tightly sealed with the valve seat inlet. The resilient normally closed mechanism comprises a resilient member 343 and a pull rod 344. The resilient member 343 is fixed on one side of the valve seat 341, and the pull rod 344 is fixed at one end of the resilient member 343 and at the other end passes through the valve seat inlet and is fixed with the sealing valve flap 342, so that the sealing valve flap 342 is tightly pressed against the valve seat inlet.

[0060] Specifically, when the external pipeline generates a pressure surge, the pressure in the first chamber 1 rises. When the pressure difference between the second chamber 2 and the first chamber 1 is less than or equal to the elastic force of the resilient member 343 on the sealing valve flap 342, the resilient member 343 remains contracted and tightly presses the sealing valve flap 342 against the valve seat inlet, and the air inlet channel 31 remains closed. When the pressure in the first chamber 1 decreases to a pressure difference between the second chamber 2 and the first chamber 1 greater than the elastic force of the resilient member 343 on the sealing valve flap 342, the resilient member 343 is stretched, and the sealing valve flap 342 is separated from the valve seat 341, so that the air inlet channel 31 is opened.

[0061] [Micro exhaust unit]

[0062] Referring to Figure 4 As shown, the micro exhaust unit comprises an exhaust channel 32 and a shut-off valve core 33. When the first chamber 1 is filled with liquid, the shut-off valve core 33 closes the exhaust channel 32. Through the rapid response of the shut-off valve core 33, the liquid can be prevented from entering the second chamber 2, and the normal operation of the water hammer elimination tank is ensured.

[0063] It should be noted that the specific structure of the shut-off valve core 33 is not limited here, and any valve core that can close the exhaust channel 32 when the first chamber 1 is filled with liquid is suitable for the present utility model, for example, in some embodiments, the shut-off valve core 33 can be a floating ball. Gas cannot make the floating ball float, but the rising liquid surface can make the floating ball float to close the exhaust channel 32, so that the exhaust channel 32 can be closed when the first chamber 1 is filled with liquid. Alternatively, in some other embodiments, the shut-off valve core 33 can be an electronic control valve and a liquid level sensor. When it is detected that the liquid level of the first chamber 1 reaches the top, the electronic control valve closes the exhaust channel 32, and the above all belong to the protection scope of the present utility model.

[0064] Optionally, the closing valve core 33 comprises a valve flap 331 and a float 332, and the float ball is taken as an example in the drawings, and other shapes of the float 332 are also applicable to the utility model. The exhaust passage 32 has an exhaust port 321, the valve flap 331 is arranged on the side of the exhaust port 321 facing the gravity direction, the float 332 is linked with the valve flap 331 and applies its gravity to the valve flap 331. When the water level rises to the position of the float 332, the float 332 rises with the water level and drives the valve flap 331 to press against the exhaust port 321. When the liquid level rises to the position of the float 332, the float 332 rises with the liquid level and drives the valve flap 331 to press against the exhaust port 321. The closing valve core 33 can automatically respond with the rising of the liquid level, and does not need to be controlled by communication, has fast response speed and low failure risk.

[0065] Further optionally, the cross-sectional area of the exhaust passage 32 is smaller than that of the air inlet passage 31, and the inner diameter of the exhaust passage 32 is 1.6-5mm. If the inner diameter of the exhaust passage 32 is too large, the technical effect of slow exhaust cannot be achieved, and if the inner diameter of the exhaust passage 32 is too small, the air in the first chamber 1 cannot be discharged in time, which easily leads to overpressure of the first chamber 1. The exhaust passage 32 is arranged in the range of 1.6-5mm, which can ensure the pressure-bearing reliability of the first chamber 1 and achieve the effect of slow exhaust.

[0066] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation of the embodiments of the utility model. For the ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, all the embodiments need not and cannot be exhausted. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A water hammer arrestor characterized by, The utility model relates to a kind of gas injection micro-discharge valves, comprising: First chamber (1), is equipped with inlet and outlet (11); Second chamber (2), is equipped with pressure regulating port (21); Gas injection micro-discharge valve (3), the first chamber (1) and the second chamber (2) are communicated via the gas injection micro-discharge valve (3), and the gas injection micro-discharge valve (3) includes air intake unit and trace exhaust unit, and the air intake unit and the trace exhaust unit are independently arranged and are communicated by communication pipe (37).

2. The water hammer arrestor of claim 1, wherein, The gas injection micro-discharge valve (3) includes: First shell (35), built-in air intake unit, the bottom of the first shell (35) is formed as first opening, and the first opening is communicated with the first chamber (1), and the top of the first shell (35) is formed as second opening, and the second opening is communicated with the second chamber (2); Second shell (36), built-in trace exhaust unit, The communication pipe (37) one end is communicated with the lower half of the first shell (35), and the other end is communicated with the lower half of the second shell (36), and the inner diameter of the communication pipe (37) is less than the inner diameter of the first opening.

3. The water hammer arrestor of claim 2, wherein, The upper portion of the second shell (36) is communicated with the upper portion of the first shell (35) via bypass pipe (38).

4. The water hammer arrestor of any one of claims 1-3, wherein, The air intake unit includes air inlet channel (31) and one-way air inlet device (34), and the one-way air inlet device (34) is arranged at the air inlet channel (31), and the one-way air inlet device (34) includes: Valve seat (341), fixed in the air inlet channel (31), and valve seat inlet is formed in the middle of the valve seat (341); Sealing valve clack (342), arranged on the side of the valve seat (341) close to the first chamber (1), and the valve seat inlet is tightly sealed; Elastic constant-closed mechanism, including elastic member (343) and pull rod (344), the elastic member (343) is fixed on one side of the valve seat (341), and the pull rod (344) one end is fixed to the elastic member (343), and the other end is fixed with the sealing valve clack (342), so that the sealing valve clack (342) is tightly closed to the valve seat inlet.

5. The water hammer arrestor of claim 2, wherein, The trace exhaust unit includes: Exhaust channel (32); Shut-off valve core (33), arranged at the exhaust channel (32), when the first chamber (1) is full of liquid, the exhaust channel (32) is closed.

6. The water hammer arrestor of claim 5, wherein, The air intake unit includes air inlet channel (31), the cross-sectional area of the exhaust channel (32) is less than the cross-sectional area of the air inlet channel (31), and the inner diameter of the exhaust channel (32) is 1.6-5mm.

7. The water hammer arrestor of claim 5, wherein, The shut-off valve core (33) includes: Valve clack (331), the exhaust channel (32) has exhaust port (321), and the valve clack (331) is arranged on the side of the exhaust port (321) towards gravity direction; Float (332), linkage with the valve clack (331), and the valve clack (331) is applied with its gravity, When water level rises to the position where the float (332) is located, the float (332) rises with water level, and drives the valve clack (331) to be tightly closed to the exhaust port (321).

8. The water hammer arrestor of any one of claims 1-3, wherein, Further include: A pressure regulating unit is in communication with the pressure regulating port (21) and is used to charge / discharge air into the second chamber (2) to regulate the pressure in the second chamber (2).

9. The water hammer arrestor of claim 8, wherein, The first chamber (1) and the second chamber (2) are formed by a partition (4) in a tank body.

10. The water hammer arrestor of claim 8, wherein, The first chamber (1) and the second chamber (2) are formed by a partition (4) in a tank body. The first chamber (1) and the second chamber (2) are formed by a partition (4) in a tank body.

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