CN111089215B - Water hammer preventing device for being installed in pipeline and pipeline assembly - Google Patents

Abstract

The present invention provides a water hammer preventing device for installation in a pipeline and a pipeline assembly, the device comprising: the device comprises a first baffle, a sliding tube, an elastic piece, a cage sleeve and a fixed seat; the fixed seat is connected with the pipeline, and is provided with a first central hole, and the axial direction of the first central hole is parallel to the axial direction of the pipeline; the cage is arranged on one side of the fixing seat facing the upstream of the pipeline, the cage is provided with a second central hole, the axial direction of the second central hole is parallel to the axial direction of the pipeline, a first through hole is formed in the pipe wall of the cage, and a gap is formed between the pipe wall of the cage and the pipe wall of the pipeline; the first baffle is hinged to one side of the cage, which is away from the fixed seat, and is used for cutting off or conducting the communication between the sliding pipe and the pipeline; the sliding tube is slidably arranged in the cage, the sliding tube is provided with a third central hole, the third central hole is communicated with the second central hole, and the sliding tube is connected with the cage through an elastic piece. The device improves the stability of fluid transmission by automatically controlling the fluid transmission in the pipeline.

Description

Water hammer preventing device for being installed in pipeline and pipeline assembly

Technical Field

The invention relates to the technical field of pipeline fluid impact prevention, in particular to a water impact prevention device and a pipeline assembly, which are arranged in a pipeline.

Background

In order to regulate and control the flow rate, pressure and the like of fluid in a pipeline, a centrifugal pump is generally installed in the pipeline so as to control the fluid in the pipeline. The inlet end of the centrifugal pump is used for being connected with an external fluid source, the outlet end of the centrifugal pump is used for being connected with a pipeline so as to control parameters such as the flow rate of fluid in the pipeline, but the opening of the centrifugal pump or the failure of an outlet valve can lead the pressure in the pipeline connected with the outlet end of the centrifugal pump to be rapidly increased, the fluid impacts the pipeline, the pressure in the pipeline is rapidly fluctuated, and the pipeline is damaged.

In the prior art, in order to prevent damage to the pipeline, a cut-off valve is generally installed on the pipeline, wherein the valve is installed on the downstream outlet pipeline of the centrifugal pump; when the centrifugal pump needs to be started, an operator controls the valve to be slowly opened, so that the pressure in the pipeline slowly changes, and damage to the pipeline due to rapid increase of the pressure in the pipeline is avoided.

Although the damage to the pipeline can be avoided in the prior art, the pressure of the fluid in the pipeline is reduced by slowly opening the control valve, an operator is required to manually control the opening speed of the valve according to own experience, the manual control valve is opened, the labor intensity of the operator is increased, the manual operation is unstable, the flow speed and the pressure of the fluid are still unstable, the pipeline is impacted, and the pipeline is damaged.

Disclosure of Invention

The invention provides a water-hammer preventing device and a pipeline assembly for being installed in a pipeline, which are used for solving the problems that in the prior art, the labor intensity of operators is increased due to the opening or the failure of a manual control valve, the flow speed and the pressure of fluid are unstable due to unstable manual operation, and the pipeline is damaged due to the impact on the pipeline.

In one aspect, the present invention provides a water hammer prevention device for installation in a pipeline, comprising: the device comprises a first baffle, a sliding tube, an elastic piece, a cage sleeve and a fixed seat; the fixing seat is used for being connected with a pipeline, the outer circumference of the fixing seat is propped against the pipe wall of the pipeline, the fixing seat is provided with a first central hole, and the axial direction of the first central hole is parallel to the axial direction of the pipeline; the cage sleeve is arranged on one side, facing the upstream of the pipeline, of the fixed seat, the cage sleeve is provided with a second central hole, the axial direction of the second central hole is parallel to the axial direction of the pipeline, a first through hole is formed in the pipe wall of the cage sleeve, and a gap is formed between the pipe wall of the cage sleeve and the pipe wall of the pipeline; the first baffle is hinged to one side of the cage facing away from the fixed seat, and is used for cutting off or conducting the communication between the sliding pipe and the pipeline; the sliding pipe is slidably arranged in the cage, the sliding pipe is provided with a third central hole, the third central hole is communicated with the second central hole, and the sliding pipe is connected with the cage through the elastic piece; after the fluid impacts the first baffle from the upstream of the pipeline, the first baffle is in a closed state for cutting off the communication between the sliding pipe and the pipeline under the impact of the fluid, the elastic piece is compressed, and the fluid flows into the downstream of the pipeline from a gap between the wall of the cage and the wall of the pipeline through the first through hole and the first center hole; when the pressure of the upper stream of the pipeline and the pressure of the lower stream of the pipeline are balanced, the elastic piece returns, and under the rebound effect of the elastic piece, the sliding pipe slides away from the fixed seat and pushes against the first baffle, so that the first baffle is in an open state for conducting the sliding pipe and the pipeline, and fluid at the upper stream of the pipeline flows into the lower stream of the pipeline through the central holes of the sliding pipe, the cage sleeve and the fixed seat.

Further, the elastic piece is sleeved outside the sliding tube, and the elastic piece extends along the axis of the second center hole.

Further, a first conical surface is arranged on one side, facing the fixed seat, of the first baffle, a second conical surface matched with the first conical surface is arranged on one side, facing away from the fixed seat, of the cage sleeve, and when the first baffle is in a closed state, the first baffle can seal a second central hole of the cage sleeve.

Further, a groove is formed in the inner wall of the cage sleeve, and the first end of the elastic piece is fixed in the groove; the sliding tube is provided with a thrust flange, and the second end of the elastic piece is fixed on the sliding tube through the thrust flange.

Further, the sliding tube includes: the first sliding section and the second sliding section, the second sliding section is connected the one end of first sliding section towards the fixing base, the external diameter of first sliding section is less than the external diameter of second sliding section to the junction of first sliding section and second sliding section forms the step face.

Further, the device also comprises a second baffle plate, wherein the second baffle plate is matched with the first central hole of the fixed seat, and the second baffle plate is rotatably arranged on the fixed seat so as to block or communicate the cage sleeve with a passage at the downstream of the pipeline through the second baffle plate; under the pressure of fluid entering a second central hole of the cage, the second baffle rotates towards the downstream of the pipeline, so that the second baffle is in an open state for conducting the cage with the downstream of the pipeline; and under the action of back pressure of fluid in the downstream of the pipeline, the second baffle plate rotates away from the downstream of the pipeline so as to enable the second baffle plate to be in a closed state for blocking the cage sleeve from the downstream of the pipeline.

Further, the second baffle is hinged with the fixed seat; a third conical surface is arranged on one side, away from the cage sleeve, of the second baffle plate, so that the second baffle plate is propped against the first central hole through the pushing-against of the third conical surface under the action of fluid back pressure;

And/or, one side of the second baffle facing the cage is provided with a fourth conical surface, one side of the fixed seat facing away from the cage is provided with a fifth conical surface matched with the fourth conical surface, so that when the second baffle is in a closed state, the second baffle can seal a second center hole of the cage.

Further, the device also comprises at least one supporting piece, wherein the first end of the at least one supporting piece is connected with the outer wall of the cage, and the second end of the supporting piece is used for propping against the inner wall of the pipeline; the at least one support is provided with a fluid hole for fluid to pass through;

and/or, the water-hammer preventing device further comprises a resisting piece, wherein the resisting piece is fixed on the inner wall of the cage sleeve, and the resisting piece is positioned on one side of the cage sleeve, which is away from the fixed seat, so that the sliding range of the sliding tube is limited through the resisting piece.

Further, a plurality of first through holes are formed in the cage sleeve; at least two of the plurality of first through holes are arranged at intervals along the circumferential direction of the cage sleeve; and/or at least two of the plurality of first through holes are arranged at intervals along the axial direction of the cage sleeve.

In another aspect, the present invention provides a pipeline assembly comprising: a pipeline in which a water hammer prevention device according to any one of the above embodiments is installed.

According to the invention, the water-hammer preventing device comprises the first baffle, the sliding pipe, the elastic piece, the cage sleeve and the fixing seat, wherein the fixing seat is connected with the pipeline, the cage sleeve is arranged on the fixing seat, the sliding pipe is slidably arranged in the cage sleeve through the elastic piece, and the first baffle is hinged with the cage sleeve, so that the first baffle rotates under the impact of fluid, and is in a closed state for cutting off the communication between the sliding pipe and the pipeline; when the pressure of the upstream pipeline and the pressure of the downstream pipeline reach balance, the sliding pipe pushes the first baffle under the resilience force of the elastic piece, so that the first baffle is in an open state for conducting the sliding pipe with the pipeline. Compared with the prior art, the water hammer preventing device provided by the invention has the advantages that the water hammer preventing device is arranged in the pipeline, so that the defects of flow rate and pressure regulation of fluid caused by manual control of the opening speed of the valve, failure of the valve and the like of an operator are avoided, and the labor intensity of the operator is further reduced; meanwhile, the flow speed and the pressure of the fluid in the pipeline are automatically controlled through the water hammer preventing device, abrupt change of fluid transmission pressure caused by failure of a manual control valve and the valve can be avoided, and further the stability of fluid transmission is improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic view of a water hammer preventing device according to an embodiment of the present invention;

FIG. 2 is a schematic view showing a structure of a first shutter in a closed state according to an embodiment of the present invention;

FIG. 3 is a schematic view showing a structure in which a first shutter is opened according to an embodiment of the present invention;

FIG. 4 is a schematic view of a sliding tube according to an embodiment of the present invention;

fig. 5 is a schematic view of a structure of a second baffle in a closed state according to another embodiment of the present invention.

Reference numerals:

100-water hammer prevention device; 110-a first baffle; 120-sliding tube; 121-thrust flange; 130-an elastic member; 140-cage sleeve; 141-a first through hole; 142-grooves; 143-a retaining member; 150-fixing seats; 160-a second baffle; 170-a support; 171-fluid aperture;

200-pipeline; 210-upstream of the pipeline; 220-downstream of the pipeline.

Specific embodiments of the present invention have been shown by way of the above drawings and will be described in more detail below. These drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but to illustrate the concepts of the present disclosure to those skilled in the art by reference to specific embodiments.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated.

A water hammer preventing device 100 for installation in a pipeline according to a first aspect of the present invention is described below with reference to fig. 1-4. As shown in fig. 1-4, the present invention provides a water hammer prevention device 100 for installation in a pipeline, comprising: the first baffle 110, the sliding tube 120, the elastic piece 130, the cage 140 and the fixed seat 150; the fixing seat 150 is used for being connected with the pipeline 200, the outer circumference of the fixing seat 150 is propped against the pipe wall of the pipeline 200, the fixing seat 150 is provided with a first central hole, and the axial direction of the first central hole is parallel to the axial direction of the pipeline 200; the cage 140 is mounted on one side of the fixing seat 150 facing the pipeline upstream 210, the cage 140 is provided with a second central hole, the axial direction of the second central hole is parallel to the axial direction of the pipeline 200, a first through hole 141 is arranged on the pipe wall of the cage 140, and a gap is arranged between the pipe wall of the cage 140 and the pipe wall of the pipeline 200; the first baffle 110 is hinged to one side of the cage 140 away from the fixed seat 150, and the first baffle 110 is used for cutting off or conducting the communication between the sliding tube 120 and the pipeline 200; the sliding tube 120 is slidably disposed in the cage 140, the sliding tube 120 has a third central hole, the third central hole communicates with the second central hole, and the sliding tube 120 is connected with the cage 140 through the elastic member 130; after the fluid impacts the first baffle 110 from the upstream 210 of the pipeline, the first baffle 110 is in a closed state that cuts off the communication between the sliding tube 120 and the pipeline 200, and the elastic member 130 is compressed, and the fluid flows into the downstream 220 of the pipeline from the gap between the wall of the cage 140 and the wall of the pipeline through the first through hole 141 and the first central hole; when the pressures of the upstream pipeline 210 and the downstream pipeline 220 are balanced, the elastic member 130 returns, and under the resilience of the elastic member 130, the sliding tube 120 slides away from the fixed seat 150 and pushes against the first baffle 110, so that the first baffle 110 is in an open state for conducting the sliding tube 120 and the downstream pipeline 200, and the fluid of the upstream pipeline 210 flows into the downstream pipeline 220 through the sliding tube 120, the cage 140 and the central hole of the fixed seat 150.

Illustratively, the fixing base 150 may be a plate body, such as a circular plate, a square plate, or a rectangular plate, and optionally, the shape of the fixing base 150 is adapted to the shape of the cross section of the pipeline 200, so as to facilitate the installation of the fixing base 150 in the pipeline 200, such that the outer circumference of the fixing base 150 abuts against the wall of the pipeline 200, so as to facilitate the fixing of the fixing base 150 in the pipeline 200.

The fixing base 150 is provided with a first central hole, wherein the first central hole penetrates through the fixing base 150, and an axial direction of the first central hole is parallel to an axial direction of the pipeline 200, it can be understood that the pipelines 200 at two sides of the fixing base 150 can be communicated through the first central hole, that is, the pipeline upstream 210 can be communicated with the pipeline downstream 220 through the first central hole, so that fluid can pass smoothly.

The cage 140 may be a tube, such as a circular, square or rectangular cross section, and optionally, the cross section of the cage 140 may be adapted to the cross section of the pipeline 200 and the shape of the fixing base 150, so that the fixing base 150 and the cage 140 are installed in the pipeline 200; the cage 140 has a second central hole, which is defined by the wall of the cage 140, and penetrates the cage 140 to allow the fluid in the pipeline 200 to pass through the second center Kong Shunli; the wall of the cage 140 is provided with a plurality of first through holes 141, and optionally, the first through holes 141 may be located at one side of the cage 140 facing the fixing seat 150.

Optionally, in the water hammer preventing device 100 of the present embodiment, the first through hole 141 is disposed at a side of the cage 140 facing the fixing seat 150, and the water hammer preventing device 100 of the present embodiment mainly uses the throttling property of the first through hole 141 to the fluid to achieve the pressure reducing effect when the high pressure fluid flows in from the upstream of the pipeline, so that the pressure downstream of the pipeline is gradually increased to achieve the pressure balance in the pipeline.

Optionally, in this embodiment, a first through hole 141 is provided on the cage 140, when the high-pressure fluid is temporarily supplied, the high-pressure fluid may flow into the second central hole through a gap between a wall of the cage 140 and an inner wall of the pipeline 200, through the first through hole 141, and then the high-pressure fluid flows into the downstream of the pipeline from the first central hole after being collided and depressurized in the second central hole. In the above process, the high-pressure fluid collides in the second central hole of the cage 140, so that the erosion of the second central hole and the pipeline 200 by the high-pressure fluid is greatly reduced. It is conceivable that, if the high-pressure fluid flows from the first through hole 141 to the front of the pipe wall of the pipe 200, the fluid directly impacts the pipe wall of the pipe 200, thereby eroding the pipe wall.

The cage 140 is mounted on the fixing seat 150, and optionally, the cage 140 can be connected with the fixing seat 150 by welding or bolting so as to realize fastening connection between the cage 140 and the fixing seat 150; of course, the cage 140 and the fixing seat 150 may be integrally formed, so as to improve the strength of the device in this embodiment, and when the cage 140 and the fixing seat 150 are integrally formed, the cage 140 and the fixing seat 150 may be made of the same material, and the cage and the fixing seat may be made of materials that are more easily corroded than the materials of the pipeline, so that when the device in this embodiment is installed in the pipeline, the probability of corrosion of the pipeline is reduced, and the service life of the pipeline is further improved. The cage 140 is mounted on the side of the mounting base 150 facing the upstream pipeline 210, the upstream pipeline 210 referring to the position where the fluid flows in, i.e. the fluid flows from the upstream pipeline 210 into the cage 140; when the cage 140 is mounted on the fixing base 150, the axial direction of the second central hole of the cage 140 is parallel to the axial direction of the pipeline 200, and the second central hole of the cage 140 is communicated with the first central hole of the fixing base 150.

A gap is provided between the pipe wall of the cage 140 and the inner wall of the pipeline 200, it can be understood that an annular space can be provided between the pipe wall of the cage 140 and the inner wall of the pipeline 200, or the pipe wall of the cage 140 abuts against one side of the inner wall of the pipeline 200, and a flow passage through which fluid flows is formed on the other side; when the cage 140 is a circular tube and the pipeline 200 is a circular tube, the outer diameter of the cage 140 is smaller than the inner diameter of the pipeline 200 so that fluid can flow through the gap between the wall of the cage 140 and the wall of the pipeline 200; optionally, the cage 140 may be disposed coaxially with the pipeline 200, so that when the fluid flows through the gaps between the walls of the cage 140 and the pipeline 200, the fluid can exert a relatively uniform force on the walls of the cage 140 and the pipeline 200, so as to increase the service lives of the walls of the cage 140 and the pipeline 200.

The first baffle 110 may be a plate body, such as a circular plate, a rectangular plate, or a square plate, and optionally, the shape of the first baffle is adapted to the cross section of the cage 140, so that the first baffle 110 is fixed on the cage 140.

The first baffle 110 is mounted on the end of the cage 140 facing away from the fixed seat 150, i.e. on the cage 140 facing the upstream line 210; the first baffle 110 may be hinged with the cage 140 such that the first baffle 110 can rotate relative to the cage 140 to switch the cage 140 and the pipeline 200 between off and on; optionally, the first baffle 110 may be connected to the cage 140 by a hinge, where the hinge includes a first hinge piece and a second hinge piece, where the first hinge piece is connected to the pipe wall of the cage 140, the second hinge piece is connected to the first baffle, a first mounting hole is formed on the first hinge piece, a second mounting hole adapted to the first mounting hole of the first hinge piece is formed on the pipe wall of the cage 140, a bolt passes through the first mounting hole and then is inserted into the second mounting hole, a third mounting hole is formed on the second hinge piece, a fourth mounting hole adapted to the third mounting hole of the second hinge piece is formed on the first baffle 110, and a bolt passes through the third mounting hole and then is inserted into the fourth mounting hole, so that the hinge is connected to the cage 140 and the first baffle 110, and of course, the cage 140 and the first baffle 110 may be hinged by other means, which is only illustrated herein.

The sliding tube 120 may be a tube body, such as a circular, rectangular or square cross section, alternatively, the cross section of the sliding tube 120 is adapted to the cross section of the cage 140, i.e. when the cross section of the cage 140 is circular, the cross section of the sliding tube 120 is also circular; the sliding tube 120 has a third center hole whose axial direction is parallel to the axial direction of the pipeline 200.

The sliding tube 120 is mounted within the cage 140, i.e., the sliding tube 120 is mounted in a second central bore of the cage 140 and a third central bore communicates with the second central bore to facilitate fluid flow from the pipeline upstream 210 through the cage 140, the sliding tube 120, and then to the pipeline downstream 220.

The elastic member 130 may be a telescopic spring, alternatively, a first end of the elastic member may be fixed to the wall of the cage 140, and a second end of the elastic member extends toward the pipeline upstream 210; the sliding tube 120 may be connected to the elastic member 130, alternatively, a first end of the sliding tube 120 may be connected to a second end of the elastic member, the second end of the sliding tube 120 extends toward the upstream of the pipeline, and when the elastic member 130 is in a normal state, the second end of the sliding tube 120 extends out of a side of the cage 140 toward the upstream of the pipeline 210 and abuts against a side of the first barrier 110 toward the fixing seat 150, so that the first barrier 110 is in an open state. Alternatively, the first end of the elastic member 130 may be spaced from the side of the cage 140 facing the fixing seat 150, and the first end of the elastic member 130 and the wall of the cage 140 on the side of the cage 140 facing the fixing seat 150 are provided with a first through hole 141.

With the water hammer preventing device 100 for installation in a pipeline provided in this embodiment, when the centrifugal pump is instantaneously opened, high-pressure fluid flows from the pipeline upstream 210 to the water hammer preventing device 100, the high-pressure fluid impacts the first baffle 110 as shown by the arrow in fig. 2, and applies a pushing force to the first baffle 110, the first baffle 110 rotates toward the cage 140, the first baffle 110 pushes the sliding tube 120 against one side of the pipeline downstream 220, so that the sliding tube 120 compresses the elastic member 130 and slides the sliding tube 120 against one side of the fixed seat 150, the first baffle 110 is in a closed state, the high-pressure fluid flows from the gap between the wall of the cage 140 and the wall of the pipeline 200 into the pipeline downstream 220 through the first through hole 141 and the first central hole, and the pipeline downstream 220 referred to herein is opposite to the pipeline upstream 210, that is, i.e., the high-pressure fluid flows from the pipeline upstream 210 to the pipeline downstream 220; when the pressures of the pipeline upstream 210 and the pipeline downstream 220 reach equilibrium, the elastic member 130 returns, and applies a pushing force to the sliding tube 120 through the resilience force, the sliding tube 120 slides away from the fixed seat 150 and pushes against the first baffle 110, so that the first baffle 110 rotates to a side away from the cage 140, the first baffle 110 is in an open state, the sliding tube 120 is conducted with the pipeline 200, and the high-pressure fluid flows from the pipeline upstream 210 to the pipeline downstream 220 through the third central hole of the sliding tube 120, the second central hole of the cage 140 and the first central hole of the fixed seat 150, as shown by an arrow in fig. 3.

The water hammer preventing device 100 for installation in a pipeline provided in this embodiment is provided by providing the water hammer preventing device 100 including the first barrier 110, the sliding tube 120, the elastic member 130, the cage 140 and the fixing base 150, by providing the fixing base 150 to be connected with the pipeline 200, by mounting the cage 140 on the fixing base 150 and slidably providing the sliding tube 120 in the cage 140 through the elastic member 130, by providing the first barrier 110 to be hinged with the cage 140, such that the first barrier 110 rotates under the impact of fluid to bring the first barrier 110 into a closed state intercepting the communication of the sliding tube 120 with the pipeline 200; when the high pressure fluid is throttled by the first through hole 141 and flows into the downstream of the pipeline, the pressure of the downstream of the pipeline gradually rises, and when the pressures of the upstream 210 and the downstream 220 of the pipeline reach balance, the sliding tube 120 pushes the first baffle 110 under the resilience force of the elastic member 130, so that the first baffle 110 is in an open state in which the sliding tube 120 is in communication with the pipeline 200.

Compared with the prior art, the water hammer preventing device 100 provided by the embodiment has the advantages that the water hammer preventing device 100 is arranged in the pipeline 200, so that the defects of unstable flow speed and pressure of the fluid regulated by an operator manually controlling the opening speed of the outlet valve of the pump are avoided, and the labor intensity of the operator is further reduced; meanwhile, the hydraulic shock prevention device 100 can automatically control the transmission of the fluid in the pipeline, so that the occurrence of hydraulic shock caused by unstable fluid transmission due to manual control of the valve can be avoided, and the stability of the fluid transmission is improved.

Further, the elastic member 130 is sleeved outside the sliding tube 120, and the elastic member 130 extends along the axis of the second central hole.

Alternatively, the elastic member 130 may be a telescopic spring, and the elastic member 130 may be sleeved outside the sliding tube 120 so as to realize smooth sliding of the sliding tube 120 in the cage, where one end of the elastic member 130 may be connected to an inner wall of the cage 140, and the other end of the elastic member 130 may be fixed to an outer wall of the sliding tube 120.

In this embodiment, the elastic member 130 is sleeved outside the sliding tube 120, so that the sliding tube 120 can slide in the cage 140 smoothly.

Of course, the mounting form of the elastic member 130 is not limited thereto, and alternatively, a plurality of elastic members 130 may be included in the present embodiment, and the plurality of elastic members 130 may be uniformly distributed along the circumferential direction of the sliding tube 120.

Illustratively, the number of the elastic members 130 may be two, and the two elastic members 130 may be uniformly distributed along the circumference of the sliding tube 120, that is, the two elastic members 130 are symmetrically distributed in the circumference of the sliding tube 120; alternatively, the first end of the elastic member 130 may be connected to the wall of the cage 140, the second end of the elastic member 130 extends toward the pipeline upstream 210, and the second end of the elastic member 130 is connected to the wall of the sliding tube 120, alternatively, the first end of the elastic member 130 may be connected to the cage 140 by welding, and the second end of the elastic member 130 may also be connected to the wall of the sliding tube 120 by welding.

Of course, the number of the elastic members 130 may be three, and the three elastic members 130 may be uniformly distributed along the circumference of the sliding tube 120, that is, the included angle between two adjacent elastic members 130 is 120 degrees.

Alternatively, when the plurality of elastic members 130 are in the normal state, the sliding tube 120 protrudes out of the cage 140 toward the side of the pipeline upstream 210 and pushes against the first barrier 110 to place the first barrier 110 in the open state.

In this embodiment, the plurality of elastic members 130 are provided, on one hand, the plurality of elastic members 130 can limit the axial movement range of the sliding tube 120 along the pipeline 200, and on the other hand, the plurality of elastic members 130 are provided in the circumferential direction of the sliding tube 120, which is beneficial to enabling the sliding tube 120 to slide smoothly along the cage 140.

Optionally, a groove 142 is formed on the inner wall of the cage 140, and the first end of the elastic member 130 is fixed in the groove 142; the sliding tube 120 is provided with a thrust flange 121, and the second end of the elastic member 130 is fixed to the sliding tube 120 through the thrust flange 121.

Illustratively, the groove 142 may be disposed along a circumferential direction of the inner wall of the cage 140, and the first end of the elastic member 130 may be fixed in the groove 142 by welding, or may be fixed in the groove 142 by clamping, which is not limited herein.

The thrust flange 121 may be an arcuate sheet, the thrust flange 121 having a first arcuate surface, optionally, the first arcuate surface may be adapted to the outer surface of the sliding tube 120 to facilitate securing the thrust flange to the sliding tube 120; the second end of the elastic member 130 may be fixed to the outer wall of the sliding tube 120, and optionally, the thrust flange 121 may press the second end of the elastic member 130 against the outer wall of the sliding tube 120, that is, the thrust flange 121 is provided with a fixing hole, the outer wall of the sliding tube 120 is provided with a mounting hole, and the second end of the elastic member 130 may be between the outer wall of the sliding tube 120 and the thrust flange 121, and a bolt is inserted into the mounting hole after passing through the fixing hole of the thrust flange 121, so as to fix the elastic member 130 to the outer wall of the sliding tube 120 through the thrust flange 121. Alternatively, the elastic member 130 may be a telescopic spring.

Alternatively, the outer circumference of the thrust flange 121 may bear against the inner wall of the cage 140 to facilitate withstanding the frontal impact of the fluid by the thrust flange 121, thereby compressing the sliding tube 120 into the cage 140 by the fluid action.

In this embodiment, the elastic member 130 is fixed on the outer wall of the sliding tube 120 through the thrust flange 121, and the first end of the elastic member 130 is fixedly connected with the groove of the cage 140, so that the elastic member 130 is stably connected between the cage 140 and the sliding tube 120, and the sliding tube 120 stably slides in the cage 140.

Optionally, the sliding tube 120 includes: the first sliding section and the second sliding section, the second sliding section is connected at the one end of the first sliding section towards the fixed seat 150, and the external diameter of the first sliding section is smaller than that of the second sliding section, so that a step surface is formed at the joint of the first sliding section and the second sliding section.

The first sliding section and the second sliding section are both pipe bodies, and the second sliding section is connected to one end of the first sliding section, which faces the fixed seat 150, so that the first sliding section and the second sliding section are enclosed together to form a third central hole; the outer diameter of the first sliding section is smaller than the outer diameter of the second sliding section to form a stepped surface at the junction of the first sliding section and the second sliding section that resists pressure shock from the pipeline upstream 210 to generate a retracting force to retract the sliding tube 120. The second sliding section and the first sliding section can be integrally formed and can be connected in a welding mode.

The second end of the elastic member 130 may be fixed at the step surface of the first sliding section and the second sliding section through the thrust flange 121, so that the thrust flange 121 is fixed, when the elastic member 130 is fixed at the step surface through the thrust flange 121, a mounting hole may be formed in the step surface, a fixing hole is formed in the thrust flange 121, the second end of the elastic member 130 is placed between the thrust flange 121 and the step surface, and a bolt is inserted into the mounting hole of the step surface after passing through the fixing hole in the thrust flange 121, so that the second end of the elastic member 130 is pressed between the thrust flange 121 and the step surface, thereby realizing the fixation of the second end of the elastic member 130.

Alternatively, the thrust flange 121 may have an annular structure, and when the thrust flange 121 has an annular structure, the thrust flange 121 may be mounted on a step surface formed by the first sliding section and the second sliding section, so that the thrust flange 121 may be stably fixed on the step surface; a thrust flange 121 is provided on a stepped surface between the first sliding section and the second sliding section, so that when the high-pressure fluid impacts the first baffle 110 from the upstream of the pipeline, the thrust flange 121 and the first baffle 110 can jointly resist the impact of the high-pressure fluid to compress the elastic member 130. The thrust flange 121 may be welded or integrally formed with the step surface, and is not particularly limited herein, so long as a fastening connection between the thrust flange 121 and the step surface can be achieved.

Further, the cage 140 is provided with a plurality of first through holes 141; at least two of the plurality of first through holes 141 are spaced apart along the circumference of the cage 140; optionally, the distance between the side of the bottom of the sliding tube 120 facing the fixed seat and the side of the cage 140 facing the fixed seat may be 2-3 times the aperture of the first through hole 141, so that when the first baffle 110 is in the closed state, the high-pressure fluid can flow into the pipeline downstream 220 from the gap between the wall of the cage and the wall of the pipeline through the first through hole 141.

Alternatively, there may be a plurality of first through holes 141, at least two of the plurality of first through holes 141 are disposed at intervals along the circumferential direction of the cage 140, and when there are 5 first through holes 141, at least two first through holes 141 of the 5 first through holes 141 may be disposed at intervals along the circumferential direction of the cage 140, and other first through holes 141 of the 5 first through holes 141 may be disposed along the axial direction of the cage 140; of course, the 5 first through holes 141 may be all arranged at intervals along the circumferential direction of the cage 140.

Optionally, at least two of the plurality of first through holes 141 are disposed at intervals along the axial direction of the cage 140, and it is understood that when there are 5 first through holes 141, at least two first through holes 141 of the 5 first through holes 141 may be disposed at intervals along the axial direction of the cage 140, and other first through holes 141 of the 5 first through holes 141 may be disposed at intervals along the circumferential direction of the cage 140; of course, the 5 first through holes 141 may be all disposed at intervals along the axial direction of the cage 140.

When the plurality of first through holes 141 are arranged at intervals along the axial direction of the cage 140, 3-4 rows of first through hole groups may be arranged along the axial direction of the cage 140, each row of first through hole groups may include a plurality of first through holes 141, and the plurality of first through holes 141 may be arranged at intervals along the circumferential direction of the cage 140, so that the high-pressure fluid smoothly enters the downstream 220 of the pipeline along the first through holes 141 of the cage 140.

In this embodiment, the plurality of first through holes 141 are formed in the cage 140, and at least two of the plurality of first through holes 141 are disposed along the circumferential direction or the axial direction of the cage 140 at intervals, so that high-pressure fluid can smoothly flow through the first through holes 141 of the cage 140 and enter the downstream of the pipeline after being throttled, thereby improving the fluid transmission efficiency.

Further, a first conical surface is disposed on a side of the first baffle 110 facing the fixed seat 150, and a second conical surface adapted to the first conical surface is disposed on a side of the cage 140 facing away from the fixed seat 150, so that the first baffle 110 can seal the second central hole of the cage 140 when the first baffle 110 is in a closed state.

For example, the cross section of the first baffle 110 may gradually decrease from the side of the first baffle 110 facing away from the fixing base 150 toward the side of the fixing base 150, that is, the outer diameter of the cross section of the first baffle facing toward the fixing base side is smaller than the outer diameter of the cross section of the first baffle facing away from the fixing base side, so as to form the first tapered surface.

Of course, the first baffle 110 may also include a first baffle segment and a second baffle segment, where the first baffle segment and the second baffle segment may be integrally formed, and the second baffle segment is located on one side of the first baffle segment facing the fixing seat 150, a step surface is formed between the second baffle segment and the first baffle segment, the first baffle segment may be a plate body, the second baffle segment may be a cone, an outer diameter of the second baffle segment facing one side of the first baffle segment is smaller than an outer diameter of the first baffle segment, and an outer diameter of the second baffle segment facing one side of the first baffle segment gradually decreases toward the other side.

The side of the cage 140 facing away from the fixing seat 150 is provided with a second conical surface, wherein the second conical surface is matched with the first conical surface of the first baffle 110, so that when the first baffle 110 is in a closed state, the first baffle can seal a second central hole of the cage 140.

Further, the second baffle 160 is further included, the second baffle 160 is adapted to the first central hole of the fixed seat 150, and the second baffle 160 is rotatably installed on the fixed seat 150, so as to block or communicate the passage between the cage 140 and the downstream pipeline 220 through the second baffle 160; wherein, under the pressure of the fluid entering the second central hole of the cage 140, the second baffle 160 rotates towards the downstream 220 of the pipeline, so that the second baffle 160 is in an open state for conducting the cage 140 with the downstream 220 of the pipeline; the second baffle 160 rotates away from the downstream pipeline 220 under the impact of the back pressure of the fluid in the downstream pipeline 220 such that the second baffle 160 is in a closed state blocking the cage 140 from the downstream pipeline 220.

Illustratively, as shown in fig. 5, the second baffle 160 may be a plate body, such as a circular plate, although the second baffle 160 may be a plate body of other shapes; the second baffle 160 may be shaped to fit the first central hole of the holder 150.

The second baffle 160 is rotatably mounted to the holder 150, alternatively, the second baffle 160 may be hinged to the holder 150 at a first central aperture thereof, such that the second baffle 160 can rotate relative to the holder 150 and such that the second baffle 160 blocks or communicates the cage with the passage of the pipeline downstream 220.

With the water hammer preventing device 100 provided in this embodiment, when the centrifugal pump is instantaneously opened, high-pressure fluid flows from the pipeline upstream 210 to the water hammer preventing device 100, the high-pressure fluid impacts the first baffle 110, so that the first baffle 110 is in a closed state, the high-pressure fluid flows into the second central hole from a gap between the wall of the pipeline 200 and the wall of the cage 140 through the first through hole 141, then the throttled high-pressure fluid in the second central hole applies thrust to the second baffle 160, the second baffle 160 rotates to an open state toward the pipeline downstream 220, the throttled high-pressure fluid flows from the first central hole toward the pipeline downstream 220, and at this time, a passage between the cage 140 and the pipeline downstream 220 is conducted; when the centrifugal pump is turned off, the pressure of the upstream 210 of the pipeline suddenly decreases, the fluid back pressure impact of the downstream 220 of the pipeline applies a thrust to the second baffle 160, and the second baffle 160 rotates away from the downstream 220 of the pipeline to the first center hole of the fixed seat 150, so that the second baffle 160 is in a closed state, and at this time, the passage between the cage 140 and the downstream 220 of the pipeline is blocked. Meanwhile, in this embodiment, the second baffle 160 is closed to prevent the back pressure impact, so as to prevent the upstream pipeline from being damaged due to the impact, and prevent the back pressure impact from affecting the reverse rotation of the pump and other devices, so that the second baffle 160 acts as a check valve.

According to the water hammer preventing device 100 provided by the embodiment, the second baffle 160 matched with the first central hole of the fixing seat 150 is arranged, and the second baffle 160 is rotatably installed on the fixing seat 150, so that the passage between the cage 140 and the pipeline downstream 220 is blocked or communicated through the second baffle 160, the problem that the pressure of the pipeline upstream 210 is reduced due to the sudden closing of the centrifugal pump, the pipeline downstream fluid impacts the upstream pipeline under the action of back pressure is solved, the passage between the pipeline upstream 210 and the pipeline downstream 220 is blocked by the second baffle 160 when the centrifugal pump is suddenly closed, the pipeline of the pipeline upstream 210 and the pump are prevented from being damaged due to back pressure impact, and the service life of the pipeline is prolonged.

Further, the second baffle 160 is hinged with the fixed seat 150; the side of the second baffle 160 facing away from the cage 140 is provided with a third conical surface, so that the second baffle 160 is pushed to the first central hole by the pushing action of the fluid back pressure.

Optionally, the second baffle 160 may be connected to the fixed base 150 by a hinge, so that the second baffle 160 can rotate relative to the fixed base 150, so as to switch between the opening and closing of the cage 140 and the downstream 220 of the pipeline; the hinge includes a third hinge piece and a fourth hinge piece, the third hinge piece is connected to one side of the fixing seat 150 facing the pipeline downstream 220, the fourth hinge piece is connected to the second baffle 160, a fifth mounting hole is formed in the third hinge piece, a sixth mounting hole adapted to the fifth mounting hole of the third hinge piece is formed in the fixing seat 150, a bolt passes through the fifth mounting hole and then is inserted into the sixth mounting hole, a seventh mounting hole is formed in the fourth hinge piece, an eighth mounting hole adapted to the seventh mounting hole of the fourth hinge piece is formed in the second baffle 160, and a bolt passes through the seventh mounting hole and then is inserted into the eighth mounting hole so that the hinge is connected to the fixing seat 150 and the second baffle 160.

The third conical surface is disposed on a side of the second baffle 160 facing away from the cage 140, and optionally, the cross section of the second baffle 160 gradually decreases from the side of the second baffle 160 facing toward the cage 140 to the other side, that is, the outer diameter of the side of the second baffle 160 facing toward the cage 140 is larger than the outer diameter of the side of the second baffle 160 facing away from the cage 140; when the centrifugal pump is suddenly closed, the fluid back pressure impact applies pressure to the third conical surface, so that the second baffle 160 rotates towards one side of the cage 140, that is, the fluid back pressure pushes the second baffle 160 to the first central hole, so that the cage 140 is disconnected from the passage of the pipeline downstream 220, and damage caused by pipeline impact on the pipeline upstream 210 is avoided.

Optionally, a fourth conical surface is disposed on a side of the second baffle 160 facing the cage 140, and a fifth conical surface adapted to the fourth conical surface is disposed on a side of the fixing base 150 facing away from the cage 140, so that when the second baffle 160 is in a closed state, the second baffle 160 can seal the second central hole of the cage 140, and also can seal the first central hole of the fixing base 150.

The fourth conical surface may be that the cross section of the second baffle 160 gradually decreases from the side of the second baffle 160 facing away from the cage 140 to the side of the cage 140, i.e. the outer diameter of the cross section of the second baffle 160 facing the side of the cage 140 is smaller than the outer diameter of the cross section of the second baffle 160 facing away from the cage 140.

A fifth conical surface is disposed on a side of the cage 140 facing the fixing seat 150, where the fifth conical surface is adapted to the fourth conical surface of the second baffle 160, so that the second baffle 160 can seal the second center hole of the cage 140 when the second baffle 160 is in a closed state.

Further, the water hammer preventing device 100 further comprises at least one supporting member 170, wherein a first end of the at least one supporting member 170 is connected with the cage 140, and a second end of the supporting member 170 is used for abutting against the pipeline 200; at least one of the support members 170 is provided with a fluid hole 171 for the passage of fluid.

Illustratively, as shown in fig. 5, the support 170 may be a plate body, such as an annular plate, and the first end of the support 170 is connected to the cage 140, that is, the inner circumference of the support 170 is connected to the cage 140, and the inner circumference of the support 170 may be connected to the outer wall of the cage 140 by welding or clamping; the second end of the support 170 is adapted to be connected to the pipeline 200, i.e. the outer circumference of the support 170 abuts the pipeline 200. It can be appreciated that the supporting member 170 may be fixed to the pipeline 200 by welding, or the supporting member 170 may abut against the pipeline 200, so that the supporting member 170 may move axially relative to the pipeline 200 to a certain extent, so that when the fixing seat 150 is in sealing connection with the pipeline 200 by welding, the cage 140 may generate stress to locally deform due to the change of the temperature of the fluid, and a certain degree of freedom may be provided to release the stress, so that the cage 140 is not damaged due to the influence of the stress, and the service life of the cage 140 is prolonged.

The support 170 is located in a gap between the pipe wall of the pipeline 200 and the pipe wall of the cage 140, and the support 170 is provided with a fluid hole 171, that is, the annular plate is provided with a fluid hole 171, wherein one or a plurality of fluid holes 171 can be arranged on the annular plate, so that the support 170 is communicated with the gap between the pipe wall of the pipeline 200 and the pipe wall of the cage 140 through the fluid hole 171.

The number of the supporting members 170 may be one or more, and when the number of the supporting members 170 is plural, the supporting members 170 are disposed at intervals along the outer wall of the cage 140, so as to support the cage 140, and make the cage 140 stably fixed in the pipeline 200.

Alternatively, the supporting members 170 may be cylinders, such as circular, square or rectangular in cross section, and when the supporting members 170 are cylinders, the supporting members 170 may be disposed on the outer wall of the cage 140 in pairs, for example, the supporting members 170 may be two, two supporting members 170 are symmetrically disposed on two sides of the cage 140, and the first ends of the supporting members 170 are connected to the cage 140, and the second ends of the supporting members 170 extend to the pipe wall of the pipeline 200 along the radial direction of the cage 140; of course, there may be multiple pairs of the support members 170, and the multiple pairs of support members 170 may be spaced apart along the axis of the cage 140 to facilitate stable fixation of the support members 170 within the pipeline 200.

The first end of the supporting member 170 may be adapted to the outer wall of the cage 140, for example, the first end of the supporting member 170 is arc-shaped, so as to stably fix the supporting member 170 and the cage 140; the second end of the support 170 may be adapted to the inner wall of the pipeline 200, for example, the second end of the support 170 may be curved, so as to stably fix the support 170 to the pipeline 200; when the support 170 is a cylinder, the support 170 may be provided with one or more fluid holes 171.

The water hammer preventing device 100 of the present embodiment includes at least one support member 170, wherein a first end of the at least one support member 170 is connected to the cage 140, a second end of the support member 170 is abutted against the pipeline 200, and a fluid hole 171 is provided in the support member 170, so as to stably fix the cage 140 in the pipeline 200.

Optionally, the water hammer preventing device 100 further includes a blocking member 143, where the blocking member 143 is fixed on an inner wall of the cage 140, and the blocking member 143 is located on a side of the cage 140 away from the fixing base 150, so as to limit a sliding range of the sliding tube 120 by the blocking member 143.

The stopper 143 may be a block or a sheet, and when the stopper 143 is a block, the stopper 143 may be a square block, a rectangular block, or the like; when the stopper 143 is a sheet, the stopper 143 may be a rectangular sheet, a square sheet, a circular sheet, or the like.

Of course, the retaining member 143 may have a circular structure, and when the retaining member 143 has a circular structure and the thrust flange 121 has a circular structure, the outer circumference of the retaining member 143 is connected to the inner wall of the cage 140; the outer circumference of the thrust flange 121 abuts against the inner wall of the cage 140, and the thrust flange 121 is sleeved outside the elastic member 130, wherein the diameter of the inner ring of the thrust flange 121 is smaller than that of the inner ring of the abutment member 143, so that a part of the area of the thrust flange 121 is exposed, and the sliding tube 120 can receive the positive impact of the fluid upstream of the pipeline through the part of the exposed area of the thrust flange 121.

One end of the blocking member 143 is connected to the inner wall of the cage 140, the other end of the blocking member 143 extends in a radial direction of the second center hole of the cage 140, and the other end of the blocking member 143 is used for blocking the stepped surface of the sliding tube 120, so as to prevent the elastic force of the elastic member 130 from being excessively large, and thus the sliding tube 120 is completely separated from the cage 140 to slide out.

In another aspect, the present invention provides a pipeline assembly comprising: pipeline 200, in which the water hammer preventing device 100 according to any one of the above embodiments is installed in pipeline 200.

Optionally, the pipeline 200 includes a pipe wall, a mounting cavity is formed in the pipe wall, the anti-striking device 100 is located in the mounting cavity of the pipe wall, and the fixing base 150 of the anti-striking device 100 is connected to the pipe wall of the pipeline 200, so as to enable the anti-striking device 100 to be stably fixed in the pipeline 200.

The water hammer preventing device 100 may be installed in a horizontally disposed pipeline 200, or may be installed in a pipeline 200 having a certain angle, or may be installed in a vertically disposed pipeline 200. The materials of the components in the water-hammering device may be the same as the material of the pipeline 200 or different from the material of the pipeline 200, but the water-hammering device 100 may be used as an anode, and the pipeline 200 may be used as a cathode, so as to avoid severe corrosion of the pipeline 200 by fluid, and further improve the service life of the pipeline 200.

The structure of the water-hammer preventing device 100 and the effects thereof are the same as those of the above-mentioned embodiments, and will not be described again.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

It should be understood that while the present disclosure has been shown in some embodiments, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.

Claims (9)

1. A water hammer prevention device for installation in a pipeline, comprising: the device comprises a first baffle, a sliding tube, an elastic piece, a cage sleeve and a fixed seat; the fixing seat is used for being connected with a pipeline, the outer circumference of the fixing seat is propped against the pipe wall of the pipeline, the fixing seat is provided with a first central hole, and the axial direction of the first central hole is parallel to the axial direction of the pipeline; the cage sleeve is arranged on one side, facing the upstream of the pipeline, of the fixed seat, the cage sleeve is provided with a second central hole, the axial direction of the second central hole is parallel to the axial direction of the pipeline, a first through hole is formed in the pipe wall of the cage sleeve, and a gap is formed between the pipe wall of the cage sleeve and the pipe wall of the pipeline; the first baffle is hinged to one side of the cage facing away from the fixed seat, and is used for cutting off or conducting the communication between the sliding pipe and the pipeline; the sliding pipe is slidably arranged in the cage, the sliding pipe is provided with a third central hole, the third central hole is communicated with the second central hole, and the sliding pipe is connected with the cage through the elastic piece;

After the fluid impacts the first baffle from the upstream of the pipeline, the first baffle is in a closed state for cutting off the communication between the sliding pipe and the pipeline, the elastic piece is compressed, and the fluid flows into the downstream of the pipeline from a gap between the wall of the cage and the wall of the pipeline through the first through hole and the first center hole;

When the pressure of the upstream of the pipeline and the pressure of the downstream of the pipeline are balanced, the elastic piece returns, and under the rebound action of the elastic piece, the sliding pipe slides away from the fixed seat and pushes against the first baffle plate so that the first baffle plate is in an open state for conducting the sliding pipe and the pipeline, and fluid on the upstream of the pipeline flows into the downstream of the pipeline through the central holes of the sliding pipe, the cage sleeve and the fixed seat;

A groove is formed in the inner wall of the cage sleeve, and the first end of the elastic piece is fixed in the groove; a thrust flange is arranged on the sliding tube;

The sliding tube includes: the second sliding section is connected to one end of the first sliding section, facing the fixed seat, and the outer diameter of the first sliding section is smaller than that of the second sliding section, so that a step surface is formed at the joint of the first sliding section and the second sliding section, and the second end of the elastic piece is fixed on the step surface through the thrust flange;

the water hammer preventing device further comprises a second baffle plate, the second baffle plate is matched with the first central hole of the fixing seat, and the second baffle plate is rotatably arranged on the fixing seat so as to block or communicate the cage sleeve with a passage at the downstream of the pipeline through the second baffle plate;

Under the pressure of fluid entering a second central hole of the cage, the second baffle rotates towards the downstream of the pipeline, so that the second baffle is in an open state for conducting the cage with the downstream of the pipeline; under the action of back pressure of fluid in the downstream of the pipeline, the second baffle plate rotates away from the downstream of the pipeline so as to enable the second baffle plate to be in a closed state for blocking the cage sleeve from the downstream of the pipeline;

the water hammer preventing device further comprises at least one supporting piece, wherein the first end of the at least one supporting piece is connected with the outer wall of the cage, and the second end of the supporting piece is used for propping against the inner wall of the pipeline; the at least one support is provided with a fluid hole for fluid to pass through;

The water-hammer-preventing device further comprises a resisting piece, wherein the resisting piece is fixed on the inner wall of the cage sleeve, and the resisting piece is positioned on one side, away from the fixed seat, of the cage sleeve, so that the sliding range of the sliding tube is limited through the resisting piece.

2. The water hammer prevention device of claim 1, wherein the elastic member is sleeved outside the sliding tube, and the elastic member extends along the axis of the second center hole.

3. The water hammer preventing device according to claim 1, wherein a first conical surface is arranged on one side of the first baffle facing the fixing seat, and a second conical surface matched with the first conical surface is arranged on one side of the cage facing away from the fixing seat, so that when the first baffle is in a closed state, the first baffle can seal a second center hole of the cage.

4. The water hammer resistant device of claim 1, wherein the second baffle is hinged to the mount; and a third conical surface is arranged on one side of the second baffle, which is away from the cage sleeve, so that the second baffle is propped against the first central hole through the pushing of the third conical surface under the action of fluid back pressure.

5. The water hammer preventing device according to claim 1, wherein a fourth conical surface is arranged on one side of the second baffle facing the cage, and a fifth conical surface matched with the fourth conical surface is arranged on one side of the fixing seat facing away from the cage, so that the second baffle can seal a second center hole of the cage when the second baffle is in a closed state.

6. The water hammer preventing device according to any one of claims 1-5, wherein a plurality of first through holes are provided on the cage.

7. The water hammer preventing device of claim 6, wherein at least two of the plurality of first through holes are spaced apart along the circumference of the cage.

8. The water hammer preventing device of claim 6, wherein at least two of the plurality of first through holes are spaced apart along the axial direction of the cage.

9. A pipeline assembly, comprising: a pipeline in which a water hammer prevention device as claimed in any one of claims 1 to 8 is installed.