Water hammer preventing device of leaf filter

Abstract

A water hammer preventing device of a leaf filter comprises a shell connected to a pipeline, a rubber water bag communicated with the pipeline is fixed in the shell, a plurality of damping holes are formed in the shell, and a reset spring is arranged between the rubber water bag and a cavity. When a water hammer occurs, the rubber water bag absorbs impact kinetic energy through expansion. According to the water hammer preventing device, kinetic energy of water hammer waves can be quickly consumed through expansion and contraction of the rubber water bag, and damage of a water hammer to a pipeline and a valve is reduced or eliminated. The waterproof hammer device is not provided with sealing matching pieces such as a piston, so that the problem that the sealing matching pieces are abraded by hard particles does not need to be considered. And the rubber water bag has good expansion durability, has no requirement on the impurity content of liquid, is low in cost and easy to maintain, and greatly prolongs the service life of the water hammer prevention device.

Description

Technical Field

[0001] The utility model relates to the technical field of leaf filters, in particular to a water hammer protection device for leaf filters. Background Art

[0002] As a highly efficient solid-liquid separation equipment, leaf filter uses a large number of electronically controlled valves as the automation level improves. Electronically controlled valves are characterized by fast opening and closing, which causes water hammer. As is known, water hammer has an amazing destructive power. In mild cases, it can cause pipeline vibration, and in severe cases, it can cause pipeline rupture and valve damage.

[0003] In the prior art, water hammer arresters are often used to eliminate water hammer phenomena. The water hammer arrester has a closed air chamber, in which a piston is arranged. When the water hammer wave is transmitted into the water hammer arrester, the piston will move toward the air chamber to absorb part of the impact kinetic energy. The stroke of the piston movement is related to the gas pressure in the air chamber and the strength of the water hammer wave. The piston reciprocates under the dual action of the air pressure and the water hammer wave, continuously eliminating the water hammer wave oscillation caused by the water hammer until the water hammer wave disappears.

[0004] From the above, it can be seen that the sealing between the piston and the air chamber is very important. Once the piston seal is damaged, the water hammer arrester will lose its function. For the leaf filter, the filtrate in the pipeline is not pure and contains a large amount of hard particles. The presence of hard particles will accelerate the wear of the piston seal and shorten the service life of the water hammer arrester. Utility Model Content

[0005] In order to overcome the shortcomings of the background technology, the utility model discloses a leaf filter anti-water hammer device, which adopts the following technical solutions:

[0006] A leaf filter anti-water hammer device comprises a shell connected to a pipeline, a rubber water bag connected to the pipeline is fixed in the shell, a plurality of damping holes are arranged on the shell, and a reset spring is arranged between the rubber water bag and the cavity; when water hammer occurs, the rubber water bag absorbs the impact kinetic energy by expanding.

[0007] To further improve the technical solution, a pipe joint is fixed on the pipeline, and the shell is screwed on the pipe joint.

[0008] To further improve the technical solution, the rubber water bag has a concave cavity with a flange at the upper edge of the cavity; the shell has a step surface, and after the shell and the pipe joint are screwed together, the flange seal is pressed tightly between the end face of the pipe joint and the step surface of the shell.

[0009] To further improve the technical solution, a gasket is provided between the return spring and the rubber water bag.

[0010] To further improve the technical solution, the shell is cup-shaped, and the damping holes are arranged on the cup wall and the cup bottom of the shell.

[0011] To further improve the technical solution, the diameter of the damping hole is 0.2-0.5 mm.

[0012] After implementing the above technical solution, compared with the background technology, the beneficial effects produced by the utility model are:

[0013] The anti-water hammer device can quickly consume the kinetic energy of the water hammer wave through the expansion and contraction of the rubber water bag, reducing or eliminating the damage caused by the water hammer to the pipeline and valve. In addition, the rubber water bag has good expansion durability and has no requirements for the impurity content of the liquid. It is not only low-cost and easy to maintain, but also greatly improves the service life of the anti-water hammer device.

[0014] Compared with the existing water hammer eliminator, the water hammer eliminator does not have sealing parts such as pistons, and does not need to consider the wear of the sealing parts by hard particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attached Figure 1 Shown is a schematic structural diagram of the leaf filter's water hammer protection device in a normal state.

[0016] Attached Figure 2 Shown is a schematic diagram of the structure of the water hammer protection device of the leaf filter when water hammer occurs.

[0017] In the attached figure: 1. pipeline; 2. pipe joint; 3. shell; 4. rubber water bag; 5. return spring; 6. gasket; 7. damping hole. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. It should be noted that in the description of the present invention, the terms "front", "rear", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of description, rather than indicating or implying that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0019] As attached Figure 1 As shown, a leaf filter anti-water hammer device includes a housing 3, a rubber water bag 4 and a reset spring 5. The structure and function thereof are described in detail below.

[0020] A pipe joint 2 is fixed on the pipe 1 of the leaf filter, and a housing 3 is screwed on the pipe joint 2. The housing 3 is in the shape of a round cup, and a step and an internal thread are provided at the cup mouth, and the internal thread is screwed with the pipe joint 2. A plurality of damping holes 7 are provided on the cup wall and the cup bottom of the housing 3, and the aperture of the damping hole 7 is 0.2-0.5 mm.

[0021] A rubber water bag 4 connected to the pipe 1 is fixed in the shell 3. Specifically, the rubber water bag 4 has a concave cavity, and the liquid in the pipe 1 can enter the cavity through the pipe joint 2. A flange is provided on the upper edge of the cavity. After the shell 3 and the pipe joint 2 are screwed together, the flange seal is pressed tightly between the end face of the pipe joint 2 and the step face of the shell 3.

[0022] The rubber water bag 4 is extensible. When the water pressure in the pipe 1 increases, the rubber water bag 4 will expand downward, and at the same time, the cavity will contain more liquid. The shell 3 has two functions: one is to fix the rubber water bag 4 on the pipe 1, and the other is to restrict the expansion direction and expansion amount of the rubber water bag 4.

[0023] The return spring 5 is arranged between the bottom of the rubber water bag 4 and the bottom of the housing 3. The function of the return spring 5 is to generate an upward thrust on the rubber water bag 4 to prevent the rubber water bag 4 from excessively expanding downward. In order to increase the action surface, a gasket 6 is arranged between the return spring 5 and the rubber water bag 4.

[0024] See attached Figure 1 When the water hammer phenomenon does not occur, the water pressure in the pipeline 1 does not change much, and under the action of the return spring 5 and the elasticity of the rubber water bag 4 itself, the cavity capacity of the rubber water bag 4 remains basically unchanged.

[0025] See attached Figure 2 When water hammer occurs, the water pressure in the pipe 1 increases suddenly under the action of the water shock wave, and the rubber water bag 4 expands downward to overcome the resistance of the return spring 5, allowing more water to enter the cavity. At the same time, the air in the shell 3 is discharged from the damping hole 7, and air resistance is generated during the discharge process. At this time, the rubber water bag 4 is affected by the water shock wave on one hand, and the return spring 5 and its own elastic force on the other hand.

[0026] The pressure of the water hammer wave changes at any time, with peaks and troughs, and the return spring 5 obeys Hooke's law, and the thrust generated by the rubber water bag 4 is also not constant. Therefore, the rubber water bag 4 is constantly expanding downward and contracting upward, and the energy of the water hammer wave caused by the water hammer is constantly consumed during the expansion and contraction movement until the water hammer wave disappears and the attached Figure 1 status in .

[0027] The damping hole 7 has both positive and negative effects. When the rubber water bag 4 expands downward, the air resistance generated by the damping hole 7 prevents the rubber water bag 4 from continuing to expand downward; when the rubber water bag 4 contracts upward, the air resistance generated by the damping hole 7 prevents the rubber water bag 4 from continuing to contract upward. This has a delaying and blocking effect on the rubber water bag 4, preventing it from expanding or contracting too quickly, which is conducive to quickly consuming the kinetic energy of the water shock wave and stabilizing the water pressure.

[0028] The rubber water bag 4 has good expansion durability and has no requirement on the impurity content of the liquid. Even if the rubber water bag 4 is damaged, it only needs to remove the shell 3 and replace the rubber water bag 4, which is convenient for maintenance.

[0029] As can be seen from the above, the anti-water hammer device can quickly consume the kinetic energy of the water hammer wave through the expansion and contraction of the rubber water bag 4, reducing or eliminating the damage caused by the water hammer to the pipeline 1 and the valve. Compared with the existing water hammer eliminator, the anti-water hammer device does not have sealing parts such as pistons, and does not need to consider the wear problem of hard particles on the sealing parts.

[0030] Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A leaf filter anti-water hammer device, comprising a housing connected to a pipeline, characterized in that: A rubber water bag connected to the pipeline is fixed in the shell, a plurality of damping holes are arranged on the shell, and a reset spring is arranged between the rubber water bag and the cavity; when water hammer occurs, the rubber water bag absorbs the impact kinetic energy by expanding.

2. A leaf filter anti-water hammer device as claimed in claim 1, characterized in that: A pipe joint is fixed on the pipeline, and the housing is screwed on the pipe joint.

3. A leaf filter anti-water hammer device as claimed in claim 2, characterized in that: The rubber water bag has a concave cavity, and a flange is arranged on the upper edge of the cavity; the shell has a step surface, and after the shell and the pipe joint are screwed, the flange seal is pressed tightly between the end face of the pipe joint and the step surface of the shell.

4. A leaf filter anti-water hammer device as claimed in claim 1, characterized in that: A gasket is arranged between the return spring and the rubber water bag.

5. A leaf filter anti-water hammer device as claimed in claim 1, characterized in that: The shell is cup-shaped, and the damping holes are arranged on the cup wall and the cup bottom of the shell.

6. A leaf filter anti-water hammer device as claimed in claim 1, characterized in that: The diameter of the damping hole is 0.2-0.5mm.

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