Water hammer protection equipment

Abstract

The invention relates to the technical field of water delivery pipeline systems, and discloses a water hammer protection device which comprises a container, an air suction port and a switch device, and the container is provided with a medium inlet and outlet used for communicating an inner cavity of the container with an external pipeline; the air suction port is positioned at the top of the container and is communicated with an inner cavity of the container; the switch device is arranged at the air suction port and enables the air suction port to be sealed and closed in a normal state, and when the pressure of the inner cavity of the container is smaller than the external atmospheric pressure, the switch device opens the air suction port. Compared with a water hammer elimination tank, the water hammer protection equipment has no inner container, has no risk of inner container breakage, still has strong capability of reducing pressure and replenishing water for a pipeline, and is simple in structure and high in reliability; compared with a pressure regulating tower, the water hammer protection equipment is provided with the air bag with pressure, the pressure reducing and water supplementing capacity is greatly improved, and the water hammer protection equipment can have smaller size and height.

Description

Technical Field

[0001] The present invention relates to the technical field of water delivery pipeline systems, and more particularly to a water hammer protection device. Background Art

[0002] Usually, in a water pipe system, when a pump suddenly stops or a valve is suddenly closed, a transient state of rapid changes in flow and pressure will occur, which is called water hammer. When water hammer occurs, due to the propagation of pressure waves caused by the sudden change in flow in the pipe, the pressure in the pipe rises rapidly, or the pressure in the pipe drops, and the pipe may collapse or be damaged due to the shock wave.

[0003] In order to prevent losses caused by water hammer hazards, water hammer protection devices such as water hammer elimination tanks or two-way pressure regulating towers are generally installed in the pump water pipeline system to replenish water to the pipeline or absorb excessive pressure in the pipeline, so as to reduce the water hammer phenomenon caused by changes in fluid flow in the pipeline.

[0004] In the prior art, a water hammer eliminator is usually a pressure tank with an inner liner, which compresses the capsule inner liner with pre-filled compressed gas to offset the pressure fluctuation of water entering the capsule inner liner from the pipeline. Due to the effect of high-pressure gas, compared with a normal pressure regulating tower, under the same pipeline pressure condition, the water hammer eliminator can have a smaller volume and height. However, when the capsule inner liner absorbs the positive pressure of the pipeline, there is a risk of capsule rupture and damage, and it is necessary to design an inlet pipeline with throttling and energy dissipation to reduce the positive pressure peak. Whether it is a regulating tower or a water hammer eliminator, other valves or accessories are required to realize their functions in conjunction, and their application sites are also subject to certain restrictions. Summary of the invention

[0005] The present invention provides a water hammer protection device, the purpose of which is to overcome the above-mentioned problems existing in the prior art.

[0006] In order to achieve the above object, the technical solution provided by the present invention is:

[0007] A water hammer protection device, comprising:

[0008] A container having a medium inlet and outlet for connecting an inner cavity of the container to an external pipeline;

[0009] An air inlet, the air inlet is located at the top of the container and communicates with the inner cavity of the container;

[0010] A switch device is arranged at the air inlet and keeps the air inlet sealed and closed normally. When the inner cavity pressure of the container is lower than the external atmospheric pressure, the switch device opens the air inlet.

[0011] As a further improvement, the water hammer protection device further includes an exhaust valve, which is communicated with the inner cavity of the container, and the exhaust port of the exhaust valve is located at the bottom of the container.

[0012] As a further improvement, the switching device includes a valve flap, a guide member and a power component, the valve flap is movably mounted at the air intake port through the guide member, the power component is connected to the valve flap and / or the guide member, and the power component provides power to drive the valve flap to close or open the air intake port.

[0013] As a further improvement, the guide member includes a guide rod and a bracket, the bracket is fixedly connected to the air intake port, one end of the guide rod is connected to the valve flap, and the guide rod and the bracket are movably matched; the power component is an elastic member.

[0014] As a further improvement, the air intake port is opened on the container.

[0015] As a further improvement, at least one air intake valve is connected to the top of the container via a flange, the air intake port is arranged on the valve body of the air intake valve, and the switch device is the valve core of the air intake valve.

[0016] As a further improvement, a dustproof filter cover is installed at the outer end of the air intake.

[0017] As a further improvement, the water hammer protection device further includes a pressure detection device connected to the inner cavity of the container.

[0018] As a further improvement, a safety valve connected to the inner cavity is installed on the container.

[0019] As a further improvement, the water hammer protection device further includes a liquid level monitoring device connected to the container.

[0020] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0021] 1. The water hammer protection device of the present invention will pre-store a certain amount of water in the container when the pipeline is filled with water. Since the container is airtight, the air in the inner cavity of the container cannot be discharged, and a pressure airbag is formed in the container, which can balance the pressure in the water pipeline. When pressure fluctuations occur in the pipeline, the pipeline pressure increases, and water will flow into the container to continue to squeeze the airbag. The airbag can offset the impact of water, and the pipeline pressure decreases. Under the action of the air mass pressure, water will be replenished into the pipeline, thereby eliminating the negative pressure generated in the pipeline at the source, playing a role in protecting against water hammer. Compared with the water hammer elimination tank, the water hammer protection device has no inner liner and no risk of inner liner rupture, but the ability to reduce pressure and replenish water in the pipeline is still very strong, and the structure is simple and the reliability is high; compared with the pressure regulating tower, the water hammer protection device has a pressurized airbag, and the ability to reduce pressure and replenish water is greatly improved, and it can have a smaller volume and height.

[0022] 2. The water hammer protection device of the present invention is provided with an exhaust valve at the bottom of the container. When the liquid level drops to the bottom of the container, the gas in the pipeline can be discharged through the exhaust valve, and the air will not cut off the water pipeline and be unable to be discharged, which will not affect the normal operation of the pipeline and is safe and reliable.

[0023] 3. The water hammer protection device of the present invention can monitor the pressure and liquid level of the device at any time and ensure the safe operation of the device through the safety valve, pressure detection device and pressure monitoring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram of an implementation method of a water hammer protection device in the embodiment;

[0025] Figure 2 is a schematic structural diagram of a switch device in an embodiment;

[0026] Figure 3 It is a structural schematic diagram of another implementation manner of a water hammer protection device in the embodiment;

[0027] Figure 4 is a schematic diagram of the internal structure of the air intake valve in the embodiment when it is in a closed state;

[0028] Figure 5 Schematic diagram of the internal structure of the air intake valve in the embodiment when it is in a closed state.

[0029] Description of labels:

[0030] 1-container, 11-inner cavity, 12-medium inlet and outlet, 13-main tank body, 14-elbow pipe, 15-top cover, 16-first opening, 17-second opening; 2-intake port; 3-switch device, 31-valve disc, 32-guide rod, 33-bracket, 34-elastic member; 4-exhaust valve; 5-intake valve, 51-valve body; 6-dust filter cover; 7-pressure detection device; 8-safety valve; 9-liquid level monitoring device. DETAILED DESCRIPTION

[0031] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.

[0032] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0033] At the same time, the terms such as "upper", "lower", "left", "right", "middle" etc. cited in this specification are only for the convenience of description, and are not used to limit the scope of implementation. Changes or adjustments in their relative relationships should also be regarded as the scope of implementation of the present invention without substantially changing the technical content. In addition, in addition to being used to indicate orientation or positional relationships, some of the above terms may also be used to express other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so as to describe the embodiments of the present application described herein.

[0035] like Figure 1-5 As shown, a water hammer protection device of this embodiment includes a container 1, an air inlet 2 located at the top of the container 1, and a switch device 3. The water hammer protection device is mainly used in water pipelines. When the water in the pipeline generates pressure fluctuations, it balances the pressure to prevent negative pressure from occurring in the pipeline, and can buffer and offset positive pressure, thereby preventing water hammer from occurring in the pipeline. It is worth noting that the device is not limited to water pipelines. In other fields of liquid or liquid mixture pipeline transportation, if there is a pressure fluctuation of the fluid medium, the device can also be used to protect against pressure shock.

[0036] In this embodiment, the container 1 has a medium inlet and outlet 12 for connecting its inner cavity 11 with an external pipeline. The medium inlet and outlet 12 can be downward or toward the side, and the specific direction is not limited. The container 1 is a hollow structure of normal pressure or pressure-bearing. The specific material of the container 1 is not limited. The container 1 can be an integrally formed structure, or an integral structure formed by welding, casting, etc., or a structure in which two or more separate parts are assembled together by screws to form an integral structure.

[0037] For example, in Figure 1 In one embodiment shown, the container 1 includes a main tank body 13, an elbow 14 and a top cover 15. A first opening 16 is provided at the bottom of the main tank body 13, one end of the elbow 14 is connected to the first opening 16 through a flange, and the other end of the elbow 14 is the medium inlet and outlet 12, and the elbow 14 can slightly reduce the impact of the fluid medium. A second opening 17 is provided at the top of the main tank body 13, and the top cover 15 is connected to the outer end of the second opening 17. In some other embodiments, the container 1 may also be an integrated tank structure, and the top cover 15 and the elbow 14 may not be provided.

[0038] In the water hammer protection device of this embodiment, the air intake port 2 can be arranged on the container 1 and located at the top of the container 1. The air intake port 2 is connected to the inner cavity 11 of the container 1. For example, in the container 1 of the first embodiment mentioned above, the air intake port 2 can be arranged on the top cover 15. For the container 1 with an integrated tank body structure, the air intake port 2 can be directly opened on the top of the tank body.

[0039] The switch device 3 in this embodiment is arranged at the air inlet 2. The switch device 3 can keep the air inlet 2 normally sealed and closed. At the same time, when the pressure of the inner cavity 11 of the container 1 is lower than the external atmospheric pressure, the switch device 3 can open the air inlet 2.

[0040] According to the water hammer protection device implemented in this embodiment, its working principle and technical effect are illustrated here by examples. For example, when the water hammer protection device is applied to a water pipeline system, the medium inlet and outlet 12 are connected to the water pipeline. When the water pump fills water into the pipeline, the water in the pipeline enters the container 1 through the medium inlet and outlet 12. Since the switch device 3 keeps the air intake port 2 normally sealed and closed, the gas in the container 1 cannot be discharged. As the gas is continuously compressed, a pressure air bag is formed in the container 1. During the operation of the pipeline, when the water flow generates a pressure reduction wave, under the action of the pressure air bag, the water in the container 1 will be squeezed into the pipeline by pressure, eliminating the pressure drop of the water flow in the pipeline and preventing the generation of a pressure reduction / negative pressure water hammer. When the water flow generates a pressure increase wave, the container 1 is like a buffer space, and the water can continue to enter the container 1 and compress the air bag. The reaction force of the air bag can buffer the positive pressure wave and reduce the pressure peak, thereby preventing the pressure increase / positive pressure water hammer.

[0041] Reference Figure 1 and Figure 2 , a switch device 3 of an embodiment is provided, the switch device 3 includes a valve flap 31, a guide member and a power component. The valve flap 31 is movably mounted at the air inlet 2 through the guide member, the power component is connected to the valve flap 31 and / or the guide member, and the power component provides power to drive the valve flap 31 to close or open the air inlet 2. Specifically, the guide member includes a guide rod 32 and a bracket 33, the bracket 33 is fixedly connected to the air inlet 2, one end of the guide rod 32 is connected to the valve flap 31, and the guide rod 32 and the bracket 33 are movably matched. The power component is an elastic member 34, and the elastic member 34 can be a pressure spring or a tension spring, etc., as long as it can provide elastic force to drive the valve flap 31 to close the air intake port 2. For example, the pressure spring can be mounted on the guide rod 32, and the valve flap 31 is arranged at the lower end of the air intake port 2. The pressure spring pushes the guide rod 32 and the valve flap 31 upward to make the valve flap 31 close the air intake port 2. When the pressure in the inner cavity 11 of the container 1 is lower than the external atmospheric pressure, the pressure spring can be compressed under the action of the internal and external pressure difference to make the valve flap 31 open the air intake port 2.

[0042] In some other embodiments of the switch device 3, the guide member may also be a slider and a guide rail. The power component may also be an electric, pneumatic, hydraulic or hybrid driven device, which can drive the valve flap 31 to move by electronic control. However, it should be noted that the electronic control method requires monitoring the changes in the pipeline pressure wave and responding in time. In terms of safety, the switch device 3 of the first embodiment does not need to be controlled, and automatically responds to the pressure change to move, which is more reliable.

[0043] Reference Figure 3 , 4 As shown in Figure 5, in some other embodiments, the water hammer protection device includes a container 1 and an air suction valve 5. At least one air suction valve 5 is connected to the top of the container 1 through a flange, and the number of the air suction valves 5 is not limited. The air suction valve 5 is a valve that can only be opened in one direction to inhale but not to exhaust. The air suction valve 5 includes a valve body 51, and the air suction port 2 is provided on the valve body 51. The valve core of the air suction valve 5 can realize the function of the switch device 3, so the valve core of the air suction valve 5 is the switch device 3.

[0044] In some optional embodiments, in order to prevent debris from being sucked into the container 1 when the air inlet 2 is opened and causing water pollution, a dust filter cover 6 is also installed at the outer end of the air inlet 2 of the water hammer protection device. The dust filter cover 6 includes a filter screen covering the air inlet 2, and by setting a suitable mesh size, it can filter debris and large particles to avoid pollution.

[0045] In the technical field, technicians usually believe that air is the culprit that hinders the water flow in the pipeline. Air retained in the water pipeline will hinder the water flow. Therefore, the existing water hammer elimination tank and pressure regulating tower will only add water to the pipeline when the pipeline pressure is reduced. When the negative pressure of the pipeline is serious, the water hammer protection device may cause the liquid level in the container 1 to drop below the medium inlet and outlet 12 after the switch device 3 is opened, which may cause air to enter the pipeline. Although the inhalation of air can eliminate the negative pressure of the pipeline and prevent the pipe from bursting, if the air is retained, it may affect The normal operation of the pipeline is affected. Therefore, in order to avoid this problem, the water hammer protection device of this embodiment also includes an exhaust valve 4, which only has an exhaust function but cannot inhale. The exhaust valve 4 is connected to the inner cavity 11 of the container 1. The height of the installation position of the exhaust valve 4 should not be too high, as long as it can be higher than the water pipeline. If it is too high, the air in the container 1 may be exhausted, resulting in the problem that the pressurized air bag cannot be formed. Therefore, the preferred solution is to set the exhaust valve 4 near the bottom of the container 1, and the exhaust port of the exhaust valve 4 is located at the bottom of the container 1. Through the setting of the exhaust valve 4, in use, the air in the container 1 and the atmosphere can enter the water pipeline through the medium inlet and outlet 12, and can also be discharged through the exhaust valve 4, thereby eliminating the air in the pipeline and allowing the pipeline to operate normally again.

[0046] In some optional embodiments, the water hammer protection device is further provided with a pressure detection device 7 connected to the inner cavity 11 of the container 1. The pressure detection device 7 may be a pressure sensor, which is mainly used to detect the pressure in the container 1 to ensure safe operation of the device.

[0047] In some optional embodiments, the container 1 is provided with a safety valve 8 connected to its inner cavity 11 , and the safety valve 8 can be opened when the pressure in the container 1 exceeds a preset threshold, thereby eliminating potential safety hazards.

[0048] In some optional embodiments, the water hammer protection device further includes a liquid level monitoring device 9 connected to the container 1, and the liquid level monitoring device 9 is mainly used to monitor the liquid level in the container 1. The liquid level monitoring device 9 can be a liquid level meter or a liquid level sensor. For example, the liquid level meter can be a magnetic flap liquid level meter, and its two ends are respectively connected to the top and bottom of the container 1, so that the liquid level of the container 1 can be visually seen; the liquid level sensor can be any one or more combinations of a magnetostrictive liquid level detector, a photoelectric liquid level sensor, an ultrasonic liquid level sensor, and a float liquid level sensor.

[0049] The terms "installed", "set", "provided with", and "connected" referred to herein should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] The present invention and its embodiments are described schematically above, and the description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. A water hammer protection device, characterized in that: include: A container (1), wherein the container (1) has a medium inlet and outlet (12) for connecting its inner cavity (11) with an external pipeline; An air intake port (2), the air intake port (2) being located at the top of the container (1) and being in communication with the inner cavity (11) of the container (1); A switch device (3) is provided at the air inlet (2) and keeps the air inlet (2) normally sealed and closed; when the pressure in the inner cavity (11) of the container (1) is lower than the external atmospheric pressure, the switch device (3) opens the air inlet (2).

2. The water hammer protection device according to claim 1, characterized in that: It also comprises an exhaust valve (4), the exhaust valve (4) being in communication with the inner cavity (11) of the container (1), and the exhaust port of the exhaust valve (4) being located at the bottom of the container (1).

3. The water hammer protection device according to claim 1, characterized in that: The switch device (3) comprises a valve flap (31), a guide member and a power component, wherein the valve flap (31) is movably mounted at the air inlet (2) via the guide member, and the power component is connected to the valve flap (31) and / or the guide member, and the power component provides power for driving the valve flap (31) to close or open the air inlet (2).

4. The water hammer protection device according to claim 3, characterized in that: The guide member comprises a guide rod (32) and a bracket (33); the bracket (33) is fixedly connected to the air inlet (2); one end of the guide rod (32) is connected to the valve flap (31); the guide rod (32) and the bracket (33) are movably matched; and the power component is an elastic member (34).

5. The water hammer protection device according to claim 4, characterized in that: The air inlet (2) is opened on the container (1).

6. The water hammer protection device according to claim 4, characterized in that: The top of the container (1) is connected to at least one air intake valve (5) via a flange, the air intake port (2) is arranged on a valve body (51) of the air intake valve (5), and the switch device (3) is a valve core of the air intake valve (5).

7. The water hammer protection device according to any one of claims 1 to 6, characterized in that: A dustproof filter cover (6) is installed at the outer end of the air inlet (2).

8. The water hammer protection device according to any one of claims 1 to 6, characterized in that: It also includes a pressure detection device (7) connected to the inner cavity (11) of the container (1).

9. The water hammer protection device according to any one of claims 1 to 6, characterized in that: The container (1) is provided with a safety valve (8) connected to the inner cavity (11).

10. The water hammer protection device according to any one of claims 1 to 6, characterized in that: It also includes a liquid level monitoring device (9) connected to the container (1).

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