CN214579676U

CN214579676U - Pipeline water hammer eliminator capable of being maintained on line

Info

Publication number: CN214579676U
Application number: CN202120368036.0U
Authority: CN
Inventors: 李飞
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-02-10
Filing date: 2021-02-10
Publication date: 2021-11-02
Anticipated expiration: 2031-02-10

Abstract

The utility model discloses a pipeline water hammer annihilator that can maintain on line, include the annihilator casing that meets with the pipeline, be equipped with the piston assembly who eliminates the water hammer in the annihilator casing, piston assembly includes the piston and is used for eliminating the water hammer and realizing the compression spring that the piston resets, the piston is equipped with separable preceding piston and back piston, installs on the preceding piston with annihilator shells inner wall sliding seal's one-level sealing mechanism, installs on the back piston with annihilator shells inner wall sliding seal's second grade sealing mechanism. The utility model is provided with a front piston and a rear piston which can be separated, and the movement of a front piston ring is limited under the action of a multi-point limiting device, and an O-shaped sealing ring and a compression spring are replaced on line, thereby realizing the on-line maintenance of the pipeline; the cooperation detachable end cover reduces and changes the degree of difficulty, improves the flexibility ratio of device, guarantees system's safe operation when eliminating among the water supply project water hammer, simple structure, and the operation is convenient.

Description

Pipeline water hammer eliminator capable of being maintained on line

Technical Field

The utility model relates to a pipeline water hammer annihilator, in particular to pipeline water hammer annihilator that can maintain on line.

Background

A water hammer is a pressure wave in a transient flow of a pipe, which is generated due to a change in the flow velocity of a section of the pipe. This change may be a normal flow regulation or a failure that blocks the flow, causing a sudden jump or drop in pressure, a transient wave of water flow pressure, just like a hammer blow, and is therefore called a water hammer.

The water hammer wave propagation speed in a steel pipe is about 1000 m/s, if the flow speed in the steel pipe is 3m/s, the water hammer pressure caused by suddenly closing a valve is about 30bar and is transmitted to the whole pipe at the speed of about one kilometer per second, and if a certain part in the pipe is defective or the pipeline strength and the equipment strength are insufficient, the water hammer burst and equipment damage accidents can occur. For example, in 1983, the valve shaft of a check valve at the outlet of a pump in a Beijing water plant is broken, the valve flap suddenly falls off to block the outlet and cut off the flow, so that a huge water hammer is generated at the position, the valve top cover is broken, a factory with ten water pumps is submerged within half an hour, the factory is forced to stop production, and the water is stopped for 10 hours in the Beijing western region on the same day, thereby causing great influence and loss on production and life.

The water hammer eliminator can effectively eliminate water hammer and irregular water shock wave shock caused by surge which are possibly generated by various fluids in a transmission system under the condition of not stopping the flow of the fluids, thereby achieving the purposes of eliminating destructive shock waves and protecting. Various water hammer cancellers that use at present all have the dynamic seal component, must have life-span problems such as ageing, fatigue, for example rubber seal ageing, compression spring lax, all need change the component that damages when system operation a period or sudden failure like this. The existing various water hammer suppressors basically need to be stopped for replacement, which brings inconvenience.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to prior art not enough, provide a reasonable in design, can eliminate water hammer among the water supply project, guarantee the pipeline water hammer annihilator of system's safe operation.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a pipeline water hammer annihilator that can maintain on line, includes the annihilator casing that meets with the pipeline, is equipped with the piston assembly who eliminates the water hammer in the annihilator casing, piston assembly includes the piston and is used for eliminating the water hammer and realize the compression spring that the piston resets, and its characteristics are, the piston is equipped with separable preceding piston and back piston, installs on the preceding piston with annihilator shells inner wall sliding seal's one-level sealing mechanism, install on the back piston with annihilator shells inner wall sliding seal's second grade sealing mechanism.

The utility model discloses the technical problem that will solve can also be realized through following technical scheme, one-level sealing mechanism and second grade sealing mechanism are the O shape sealing washer that sets up along preceding piston or back piston circumference, are equipped with the slot that is used for fixed O shape sealing washer on the lateral wall of preceding piston or back piston.

The utility model discloses the technical problem that will solve can also be realized through following technical scheme, one-level sealing mechanism's O shape sealing washer compression volume is less than second grade sealing mechanism's O shape sealing washer compression volume, and one-level sealing mechanism's O shape sealing washer is vice sealed, and second grade sealing mechanism's O shape sealing washer is main sealed.

The technical problem to be solved by the utility model can be realized by the following technical proposal that a multi-point limiting device for limiting the movement of the front piston to realize online maintenance is arranged on the side wall of the eliminator shell;

the multipoint limiting device comprises a plurality of limiting seats arranged along the circumferential direction of the eliminator shell, the limiting seats are fixed on the side wall of the eliminator shell, limiting screws extending into the eliminator shell are inserted into the limiting seats, and limiting steps matched with the limiting screws are arranged on the end face, opposite to the rear piston, of the front piston.

The utility model discloses the technical problem that will solve can also be realized through following technical scheme, multiple spot stop device still including establishing the piston tang ring that the piston moved forward before the restriction of piston the place ahead in the front, the piston tang ring is fixed on annihilator shells inner wall.

The utility model discloses the technical problem that will solve can also be realized through following technical scheme, stop screw is equipped with the passageway of taking a breath of intercommunication annihilator casing and external environment, and the outer port department of the passageway of taking a breath is equipped with the sealing plug, stop screw is last be equipped with spacing seat seal fit's spacing sealing washer, be equipped with on the stop screw of spacing seat outer end rather than complex stop nut.

The utility model discloses the technical problem that will solve can also be realized through following technical scheme, be equipped with the back step that sets up relatively with spacing step on the terminal surface that back piston is relative with preceding piston.

The utility model discloses the technical problem that will solve can also be realized through following technical scheme, fixed mounting has the pull rod that sets up outwards on the back piston.

The utility model discloses the technical problem that will solve can also be realized through following technical scheme, the terminal surface of back piston is equipped with the ring channel that is used for fixing a position compression spring.

The utility model discloses the technical problem that will solve can also be realized through following technical scheme, and annihilator casing front end is equipped with the preceding port with the pipeline intercommunication, and annihilator casing rear end is equipped with the convenient back port of maintaining, and back port department is equipped with the end cover that is used for restricting compression spring and removes, is equipped with the blast pipe on the end cover, connects through the flange between end cover and the annihilator casing back port, between annihilator casing front end and the pipeline, is equipped with seal gasket between annihilator casing rear end and the end cover.

Compared with the prior art, the utility model has the advantages that the front piston and the rear piston which can be separated are arranged, the movement of the front piston ring is limited under the action of the multi-point limiting device, the O-shaped sealing ring and the compression spring are replaced on line, and the on-line maintenance of the pipeline is realized; the cooperation detachable end cover reduces and changes the degree of difficulty, improves the flexibility ratio of device, guarantees system's safe operation when eliminating among the water supply project water hammer, simple structure, and the operation is convenient. The pipeline water hammer eliminator is suitable for any liquid medium capable of generating water hammer pressure.

Drawings

Fig. 1 is a schematic view of the normal operation state of the pipe water hammer arrestor according to the present invention;

fig. 2 is a schematic view of the limit water hammer working state of the pipe water hammer eliminator according to the present invention;

fig. 3 is a schematic view of the normal operation and maintenance state of the pipe water hammer eliminator.

In the figure: 1-an eliminator housing; 2-a limit step; 3-front piston; 4-rear piston; 5-compression spring; 6-end cover; 7-a pull rod; 8-a sealing gasket; 9-piston stop ring; 10-O-ring seal; 11-an exhaust pipe; 12-a fastening bolt; 13-a fastening nut; 14-a limiting seat; 15-a limit screw; 16-a limit sealing ring; 17-a limit nut; 18-rear step.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Referring to fig. 1-3, an online maintainable pipeline water hammer eliminator comprises an eliminator shell 1 connected with a pipeline, a piston assembly for eliminating water hammer is arranged in the eliminator shell 1, the piston assembly comprises a piston and a compression spring 5 for eliminating water hammer and realizing piston reset, the piston is provided with a front piston 3 and a rear piston 4 which can be separated, the front piston 3 is provided with a primary sealing mechanism which is in sliding seal with the inner wall of the eliminator shell 1, and the rear piston 4 is provided with a secondary sealing mechanism which is in sliding seal with the inner wall of the eliminator shell 1;

the primary sealing mechanism and the secondary sealing mechanism are both O-shaped sealing rings 10 arranged along the circumferential direction of the front piston 3 or the rear piston 4, grooves for fixing the O-shaped sealing rings are arranged on the side walls of the front piston or the rear piston, and the compression amount (deformation amount) of the O-shaped sealing rings of the primary sealing mechanism is smaller than that of the O-shaped sealing rings of the secondary sealing mechanism; in order to improve the compression amount of the O-shaped sealing ring, the diameter of the groove of the front piston 3 is slightly smaller than that of the groove of the rear piston 4, two-stage different sealing can be realized by matching the same O-shaped sealing ring 10, the compression amount of the rear-stage O-shaped sealing ring is slightly larger than that of the main sealing ring, the compression amount of the front-stage O-shaped sealing ring is slightly smaller than that of the auxiliary sealing ring, and the replacement period is long.

The end surface of the rear piston 4 is provided with an annular groove for positioning a compression spring, and the side wall of the eliminator shell 1 is provided with a multi-point limiting device for limiting the movement of the front piston 3 to realize online maintenance;

the multi-point limiting device comprises a front limiting device arranged in front of the front piston 3 and a rear limiting device arranged behind the front piston 3;

the front limiting device is a piston stop ring 9 fixed on the inner wall of the eliminator shell 1 and used for limiting the front piston to move forwards;

the rear limiting device comprises a plurality of limiting seats 14 arranged along the circumferential direction of the eliminator shell 1, the limiting seats 14 are fixed on the side wall of the eliminator shell 1, limiting screws 15 extending into the eliminator shell 1 are inserted into the limiting seats 14, limiting nuts 17 for controlling the insertion depth of the limiting screws 15 are arranged on the limiting screws 15 at the outer ends of the limiting seats 14, limiting seal rings 16 in sealing fit with the inner walls of the limiting seats 14 are arranged on the limiting screws 15, the limiting seal rings 16 adopt O-shaped seal rings, limiting steps 2 in fit with the limiting screws 14 are arranged on the end faces, opposite to the front piston 3 and the rear piston 4, of the rear piston 4, back steps 18 in fit with the limiting steps 2 are arranged on the end faces, opposite to the front piston 3, and double-thread locking and anti-loosening of the limiting screws 15 are realized by combining threaded holes on the limiting seats 14;

the limiting screw 15 is provided with a ventilation channel for communicating the eliminator shell with the external environment, the outer port of the ventilation channel is provided with a sealing plug, the limiting screw 15 is provided with a limiting sealing ring 16 which is in sealing fit with the limiting seat, the limiting screw 15 at the outer end of the limiting seat is provided with a limiting nut 17 which is in fit with the limiting screw 15, the resistance in the eliminator shell is reduced when the rear piston is pulled out, the arrangement mode of the ventilation channel can be set according to the use requirement, if the ventilation channel is arranged along the axial direction of the limiting screw, the processing technology is simplest, the height or the width of the step can be adjusted in order to prevent the step surfaces of the limiting step 2 and the back step 18 from blocking the ventilation channel, and in addition, the limiting step is a cylindrical surface, the front end of the limiting screw is a plane, and the limiting screw is in line contact, so that the ventilation is not influenced;

when the limiting screw 15 is screwed inwards, the limiting screw can enter the steps of the front piston 3 and the rear piston 4, so that the movement of the front piston 3 is limited, the detachable end cover 6 is matched, the online replacement of the O-shaped ring and the compression spring is realized, when the limiting screw is screwed inwards to the bottom, a ventilation channel in the limiting screw 15 cannot be blocked by the limiting step 2 of the front piston 3, and the rear piston is conveniently pulled out of the shell of the eliminator; after the replacement is finished, the limiting screw 15 is screwed back, and the pipeline water hammer eliminator can work normally.

The front end of the eliminator shell 1 is provided with a front port communicated with a pipeline, the rear end of the eliminator shell 1 is provided with a rear port convenient for piston replacement, the rear port is provided with an end cover 6 used for limiting the movement of a compression spring, the end cover 6 is provided with an exhaust pipe 11, the end cover 6 is connected with the rear port of the eliminator shell 1 and the front port of the eliminator shell 1 is connected with the pipeline through flanges, namely, the front port of the eliminator shell is provided with a front flange, the rear port of the eliminator shell is provided with a rear flange, a sealing gasket 8 is arranged between the rear end of the eliminator shell and the end cover, and the end cover is connected with the rear flange through a fastening bolt 12 and a fastening nut 13, so that the end cover can be detached; and a back port of the eliminator shell is provided with a fillet for protecting the O-shaped sealing ring from being damaged.

The rear piston 4 is fixedly provided with a pull rod 7 which is arranged outwards and is convenient to pull out the rear piston, the pull rod 7 is arranged right opposite to an exhaust pipe 11 of the end cover, the pull rod 7 is in threaded connection with the rear piston 4, the rear piston is convenient to take out and the O-shaped sealing ring is convenient to replace in the online maintenance process, the compression spring is sleeved on the pull rod, and when the rear piston moves backwards, the end cover is prevented from blocking the movement of the rear piston.

In a normal working state, the limiting screw 15 is not screwed into the eliminator shell 1, when water hammer occurs, the front piston 3 and the rear piston 4 can freely move along the axial direction under the action of water hammer wave pressure, can reach the limit position shown in figure 2 at most to play a role of eliminating the water hammer, and then gradually returns to the state shown in figure 1 under the action of the compression spring 5 along with the reduction of the water hammer wave pressure;

when the regular inspection or the leakage is found to be needed for maintenance, the limiting nut 17 can be withdrawn, the limiting screw 15 is screwed inwards into the shell 1, the front part of the limiting screw enters the steps of the front piston 3 and the rear piston 4, so that the movement of the front piston 3 is limited, the O-shaped sealing ring 10 and the compression spring 5 can be replaced on line by matching with the detachable end cover 6, as shown in fig. 3, the matched fastening bolt 12 is longer, the compression spring 5 can be restored to the free length, and the rear piston 4 can be easily taken out by utilizing the pull rod 7 to replace the O-shaped sealing ring 10; after the replacement is finished, the limiting screw 15 is screwed back and locked by the limiting nut 17, and the pipeline water hammer eliminator can work normally.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a pipeline water hammer annihilator that can maintain on line, includes the annihilator casing that meets with the pipeline, is equipped with the piston assembly who eliminates the water hammer in the annihilator casing, piston assembly includes the piston and is used for eliminating the water hammer and realize the compression spring that the piston resets, its characterized in that, the piston is equipped with separable preceding piston and back piston, installs on the preceding piston with annihilator shells inner wall sliding seal's one-level sealing mechanism, install on the back piston with annihilator shells inner wall sliding seal's second grade sealing mechanism.

2. The pipeline water hammer eliminator capable of being maintained online as claimed in claim 1, wherein the primary sealing mechanism and the secondary sealing mechanism are both O-shaped sealing rings arranged along the circumferential direction of the front piston or the rear piston, and grooves for fixing the O-shaped sealing rings are arranged on the side wall of the front piston or the rear piston.

3. The pipeline water hammer eliminator capable of being maintained online as claimed in claim 2, wherein the compression amount of the O-shaped sealing ring of the primary sealing mechanism is smaller than that of the O-shaped sealing ring of the secondary sealing mechanism, the O-shaped sealing ring of the primary sealing mechanism is a secondary seal, and the O-shaped sealing ring of the secondary sealing mechanism is a primary seal.

4. The pipeline water hammer eliminator capable of being maintained online according to claim 1, wherein a multi-point limiting device for limiting the movement of a front piston to realize online maintenance is arranged on the side wall of the eliminator shell;

5. The on-line maintainable pipeline water hammer arrestor of claim 4, wherein the multi-point limiting device further comprises a piston stop ring disposed in front of the front piston, the piston stop ring being fixed to the inner wall of the arrestor housing.

6. The pipeline water hammer eliminator capable of being maintained on line according to claim 4, wherein the limiting screw is provided with a ventilation channel for communicating the eliminator shell with the external environment, a sealing plug is arranged at the outer port of the ventilation channel, a limiting sealing ring in sealing fit with the limiting seat is arranged on the limiting screw, and a limiting nut in fit with the limiting screw is arranged on the limiting screw at the outer end of the limiting seat.

7. The pipeline water hammer eliminator which can be maintained on line as claimed in claim 4, wherein the end face of the rear piston opposite to the front piston is provided with a rear step opposite to the limit step.

8. The on-line maintainable pipeline water hammer arrestor of claim 1, wherein an outward-facing pull rod is fixedly mounted on the rear piston.

9. The on-line serviceable pipe water hammer arrestor of claim 1, wherein the end face of the rear piston is provided with an annular groove for positioning a compression spring.

10. The pipeline water hammer eliminator capable of being maintained online as claimed in claim 1, wherein the eliminator casing has a front end connected to the pipeline, a rear end convenient for maintenance, an end cap for limiting the movement of the compression spring, an exhaust pipe on the end cap, a sealing gasket between the end cap and the eliminator casing rear end and between the eliminator casing front end and the pipeline, and a sealing gasket between the eliminator casing rear end and the end cap.