CN108953707B

CN108953707B - Safety protection valve and pipeline safety protection device

Info

Publication number: CN108953707B
Application number: CN201810919642.XA
Authority: CN
Inventors: 高广宇; 唐兴成; 李来彬; 张婉晴
Original assignee: Idc Plumbing & Heating Technology Beijing Co ltd
Current assignee: Idc Plumbing & Heating Technology Beijing Co ltd
Priority date: 2018-08-14
Filing date: 2018-08-14
Publication date: 2021-06-04
Anticipated expiration: 2038-08-14
Also published as: CN108953707A

Abstract

The invention relates to a safety protection valve and a pipeline safety protection device, wherein a valve seat, a valve clack and a return spring are arranged in a medium channel of the safety protection valve, the valve seat is fixedly arranged in front of the valve clack, the valve clack is movably arranged in the valve body, two ends of the return spring are respectively connected with the valve body and the valve clack, the return spring is preferably sleeved with a pre-compression spiral spring on the valve clack, an elastic check piece is arranged in front of the valve seat, and the pipeline safety protection device comprises a pipeline valve and a safety protection valve which are sequentially connected from front to back. The invention can automatically turn off when the front pipeline is damaged and loses pressure or leaks a large amount, does not need manual intervention, does not depend on external equipment, and has low cost, convenient use and good reliability.

Description

Safety protection valve and pipeline safety protection device

Technical Field

The invention relates to a safety protection valve and a pipeline safety protection device adopting the safety protection valve.

Background

The conventional pipeline safety protection, for example, leakage due to pipeline breakage often needs to be manually shut off, a long time is often needed from the discovery of leakage to the shut-off of a rear valve, if no leakage is found in time, long-time leakage also happens occasionally, a common idea at present is to establish a pipeline monitoring system, set a plurality of sampling points on a pipeline, automatically collect media flow related conditions of the sampling points, such as media pressure, flow and the like, send related data to a computer system for analysis and processing, if abnormal conditions such as leakage occur, the computer system gives an alarm, automatically or by a dispatching command system, a person is commanded to cut off the rear valve of a leakage section on site through an electric control valve, the timeliness of discovering the pipeline fault is improved in a certain program by the mode, but a large amount of manpower and material resources are needed by the related computer system and the dispatching command system, and the system also depends on the effective work of a plurality of devices and communication links, has a plurality of influencing factors and is easy to have unpredictable faults.

Disclosure of Invention

In order to solve the technical problems, the invention provides a safety protection valve and also relates to a pipeline safety protection device adopting the safety protection valve.

The technical scheme of the invention is as follows: a safety protection valve comprises a valve body provided with an inlet and an outlet, wherein a valve seat, a valve clack and a reset spring are arranged in a medium channel of the valve body, the valve seat is fixedly arranged in front of the valve clack and is provided with a central through hole forming the medium channel in the valve body, the valve clack is movably arranged in the valve body and is provided with a moving gap between the valve body and the inner wall of the valve body, the valve clack and the valve seat are respectively provided with sealing surfaces which are matched with each other to jointly form a sealing pair of the valve, and two ends of the reset spring are respectively connected with the valve body and the valve cla.

A pipeline safety protection device comprises a pipeline valve and any one of the safety protection valves disclosed by the invention, wherein the pipeline valve is positioned behind the safety protection valve, and the outlet end of the pipeline valve is connected with the inlet end of the safety protection valve.

The main working principle and the beneficial effects of the invention are as follows: the safety protection valve is arranged in front of the pipeline valve, after the pipeline valve is opened, water flow enters a medium channel in the safety protection valve, pressure is generated on the valve clack to push the pre-compressed spiral spring, the water flow flows into a central through hole of the valve seat through a gap between the valve clack and the opposite sealing surface of the valve seat to flow into the pipeline in front, when the pressure is greatly reduced due to the breakage of the pipeline in front and the like, the medium pressure at the outlet side of the safety protection valve is also greatly reduced, under the action of high pressure difference at the inlet and the outlet of the safety protection valve, the valve clack further compresses the spiral spring until the spiral spring is contacted with the sealing surface of the valve seat, the medium channel is cut off, when the pressure difference at the inlet and the outlet of the safety protection valve is overlarge due to other reasons, the medium channel of the safety protection valve is also cut, let rivers freely pass through, when place ahead pipeline or equipment take place the proruption and damage, can cut off the rivers automatically, with the pipeline valve closure back, the safety protection valve can automatic re-setting under reset spring's effect, becomes the open mode by cutting the state, has made things convenient for the use from this greatly, and the reaction rate is fast, and the good reliability does not need artifical the intervention, does not also rely on other equipment, does not rely on huge monitored control system of investment and dispatch command system.

Drawings

FIG. 1 is a schematic view of a protective device of the present invention;

FIG. 2 is a schematic view of the working principle of the valve seal pair of the safety protection valve of the present invention;

fig. 3 is a schematic view of the elastic ratchets involved in the present invention in the reverse flow (closed state of the ratchets);

fig. 4 is a schematic view of the elastic ratchets according to the present invention in a forward flow (open state of the ratchets);

fig. 5 is a schematic diagram of the variation of the wall thickness of the elastic ratchets to which the present invention relates.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1 and 2, the safety protection valve provided by the invention comprises a valve body 2 provided with an inlet and an outlet, a valve seat 6, a valve clack 3 and a return spring 11 are arranged in a medium channel 10 of the valve body, the valve seat is fixedly arranged in front of the valve clack and is provided with a central through hole 13 forming a medium channel in the valve body, and when the central through hole of the valve seat is closed, the medium channel of the safety protection valve is closed. The valve flap is movably arranged in the valve body, a moving gap is reserved between the valve flap and the inner wall of the valve body to allow the valve flap to move back and forth along a medium channel in the valve body, the valve flap and the valve seat are respectively provided with mutually matched sealing surfaces to jointly form a sealing pair of the valve, and two ends of the reset spring are respectively connected with the valve body and the valve flap (including direct connection and/or indirect connection through other parts) to apply reverse acting force to the forward movement of the valve flap. The reset spring not only ensures that the safety protection valve is closed only after the pressure difference between the inlet and the outlet reaches a certain degree, but also enables the valve clack to move backwards to realize automatic reset after the overlarge pressure difference is eliminated, for example, after the pipeline valve 1 behind the safety protection valve is turned off, and the safety protection valve automatically restores to an opening state.

The mutually matched sealing surfaces on the valve clack and the valve seat can adopt any proper prior art, and can be hard sealing or soft sealing, when hard sealing is adopted, the surface hardening treatment of the sealing surfaces can be carried out, or the sealing surfaces are processed on hard materials subjected to overlaying welding, when soft sealing is adopted, sealing parts (such as rubber sealing rings or sealing gaskets and the like) used for forming soft sealing can be arranged on two pieces of a sealing pair, or the sealing parts used for forming soft sealing can be arranged on one piece, and the corresponding sealing surfaces are directly formed on the hard materials of the other piece.

The rear end face of the valve clack or the maximum cross section at any other position is set according to actual needs, a certain area on the cross section of a medium channel in the valve body is covered, excessive resistance is not generated under normal conditions, and sufficient thrust can be obtained after the front pressure loss, so that the valve clack moves forwards to be in contact with the sealing surface of the valve seat and cut off the medium channel.

The rear end face of the valve clack can be a concave curved surface so as to obtain larger thrust under the condition of the same resistance to medium flow.

The reset spring can be applied with pre-deformation for generating a backward acting force on the valve clack so as to ensure that the valve clack is stably positioned at a normal position at the back under a normal condition, the sealing pair is a normally open sealing pair, the valve clack can move forward only after the forward thrust of a medium exceeds the pre-deformation acting force of the reset spring, and the pre-deformation and the corresponding elastic force are set according to actual requirements.

The return spring may comprise a tension spring and/or a thrust spring, and the two ends of the return spring may be connected in any suitable manner, as long as the state of the spring can be changed after the valve clack moves towards the spring, so that the spring can generate or increase the backward acting force on the valve clack.

For example, the tension spring may have a front end connected to the valve flap and a rear end connected to the valve body, and the thrust spring may have a front end connected to the valve body and a rear end connected to the valve flap, whereby forward movement of the valve flap stretches the tension spring and/or compresses the thrust spring, causing the tension spring to form and apply a rearward tension to the valve flap, and the thrust spring forms and applies a rearward thrust to the valve flap.

Reset spring is connected with other pieces to produce elastic deformation and then exert the effort backward to the valve clack when the valve clack moves forward and as the purpose, consequently as long as interconnect position between them is because of the valve clack antedisplacement keep relatively fixed in corresponding atress direction can, for example, fixed connection such as welding, fixed joint and fixed grafting, or the link of spring supports under the effect of elastic force and leans on corresponding mounting.

The valve body and valve seat are preferably coaxial tubular bodies. And the outer side surface of the valve seat and the inner wall of the valve body are sealed to prevent a medium from passing through a gap between the valve seat and the valve body.

The valve clack is columnar, can be a hollow column or a solid column, or is cylindrical with a closed cylindrical hole.

The valve seat sealing surface is positioned at the rear end of the valve seat, and the valve clack sealing surface is positioned at the front end of the valve clack. The sealing pair can be a hard seal or a soft seal, and the configuration and the matching mode of the sealing surfaces can be designed according to the requirements of specific application occasions according to the prior art or other suitable technologies.

For example, for a heating system, the front end of the valve flap may be embedded with a sealing ring 4, and the sealing ring may be made of an elastic material such as rubber, and is an elastic sealing ring to improve the sealing effect.

The flap sealing surface should typically be located on the exposed surface of the seal ring.

The valve seat sealing surface and the valve flap sealing surface can adopt any one of the following shape combinations:

1) are all annular planes which are vertical to the axial line of the valve body;

2) one is an annular plane perpendicular to the valve body axis, and the other is an annular convex surface;

3) one is an annular conical surface, and the other is an annular spherical surface (spherical crown-shaped curved surface);

4) one is an annular conical surface, the other is an annular plane,

any other suitable combination of shapes may also be used.

Preferably, a flap rear stop 12 is provided in the valve body, which stops behind the flap so that it cannot be moved further backwards, thus defining the final position of the flap.

The valve flap rear baffle frame can adopt any prior art, is fixedly installed in the valve body and is provided with a medium channel for a medium to pass through, such as an axial through hole or a hole, an interval between frames or a gap on a grid, and the like, the medium channel on the valve flap rear baffle frame is a channel which cannot be passed through by the valve flap, such as the cross section area or the size of at least one specific direction of the medium channel is smaller than the area of the rear end surface of the valve flap or the size of the rear end surface in the specific direction, and the specific structure can adopt any suitable form, such as a Y-shaped frame, an equilateral triangle frame, a cross-shaped frame or a pore plate, and the like A radial stop or the like, thereby blocking the flap from passing through while allowing the medium to flow through.

The front end of the valve body is preferably provided with a plug 5 with a central through hole.

The inner diameter of the central through hole of the plug should generally be smaller than the outer diameter of the valve seat.

The rear part of the central through hole of the valve seat can be a stepped hole 9, the valve seat is embedded in the stepped hole, and the outer side surface of the valve seat is sealed with the inner wall of the central through hole of the plug.

The plug can be provided with external threads and is screwed on the front end opening of the valve body.

In the preferred embodiment shown in fig. 1, the valve body and the valve seat are both tubular, the valve flap is cylindrical in shape, the return spring is a pre-compressed coil spring, which is fitted over the valve flap, a gap is left between the front end of the spiral spring and the outer side surface of the valve clack, the front end of the spiral spring is abutted against or fixedly connected on the valve seat or the plug, the rear end of the spiral spring is abutted against or fixedly connected at the rear part of the valve clack, the rear of the flap may be provided with an annular flange or socket for connection of the return spring, or the rear end of the return spring is welded or screwed on the side wall of the valve clack, a valve clack rear baffle frame which is arranged behind the valve clack is arranged in the valve body, the front end of the spiral spring is abutted against the valve seat or the valve body, and the rear end of the spiral spring is abutted against or fixedly connected with the rear part of the valve clack, so that the spiral spring is connected with the valve seat or the valve body.

The front portion of the plug preferably extends with a connecting tube section for connecting an external pipe.

The connecting pipe section may be provided with a pipe quick-connect 7 or without a pipe quick-connect.

The front end of valve clack is preferred to be extended out and is followed the guide post, the diameter of guide post is less than the diameter of valve clack main part, be equipped with on disk seat and/or the end cap with guide post complex guide structure, the cross section at guide structure place is equipped with the medium passageway, guide structure can adopt arbitrary suitable prior art, and the restriction is down under the prerequisite of not cutting off the medium passageway the guide post is along axial displacement, for example, centers on a plurality of alternate cylindrical shape limiting plates that distribute around the guide post, or the radial gag lever post of a plurality of different positions of distribution around the guide post, and its inner end centers on around the guide post.

Preferably, the valve seat is further provided with an elastic non-return member 8 in front of the valve seat, the elastic non-return member is conical, the vertex of the cone is forward, the front part of the elastic non-return member is provided with a plurality of non-return seams 14 along the generatrix direction, the front ends of the non-return seams converge at the vertex of the cone, so that the non-return seams are communicated with each other at the vertex of the cone, a slit for allowing a medium to flow through can be formed by cutting or punching, and the like, when the medium flow direction is from back to front, the rear pressure is large, the non-return seams are squeezed by the pressure difference between the front side and the rear side of the elastic non-return member, the medium flow passage is cut off (see fig. 3), so that the non-return effect is formed, the thickness and hardness of the elastic non-return member are selected according to actual needs so as to ensure that the non-return member is not collapsed or even turned back under the action of the reverse medium pressure, to maintain effective backstopping.

Referring to fig. 5, the vertex of the cone of the elastic ratchet is preferably in the shape of a rounded arc, and may also be in the shape of a point.

The bottom opening of the cone forms the inlet of the forward flow.

The check slits are preferably equally spaced in the circumferential direction.

The axial length (projected length in the axial direction) of the check slit is preferably 50 to 70% of the total axial length of the tapered body.

The inner wall of the conical body can be provided with a plurality of inner convex ribs 84 extending along the bus direction, the number of the inner convex ribs is the same as that of the non-return seams and the inner convex ribs are alternately distributed in the circumferential direction, and the inner convex ribs are circumferentially positioned at the midpoint of two adjacent non-return seams. Therefore, the central line of each triangular plate separated from the adjacent non-return seams on the conical body is provided with a convex rib so as to improve resilience force and strength and avoid the conical body from being crushed by reverse flow.

The raised height of the internal ribs is preferably greater than 1/2 the thickness of the main portion 81 of the cone (which may be referred to as an isopycnic region). That is, when the cone is provided with a thickened region, the protruding height of the inner rib is preferably greater than 1/2 of the thickness of the cone outside the thickened region, and when the cone is not provided with a thickened region, the protruding height of the inner rib is preferably greater than 1/2 of the thickness of the cone. So as to ensure that the convex ribs can effectively play the roles of elasticity, strength and the like.

The axial front portion of the cone is preferably a thickened region 82, the thickness of which gradually increases from back to front, whereby the edges of adjacent triangular plates can still be in contact and pressed against each other when the triangular plates are disturbed to a certain extent by the water flow, and still form a whole under reverse flow, without excessive material consumption.

The front end thickness of the thickened area is preferably 2-3 times of the rear end thickness so as to ensure that the edges of the front end can contact with each other under the turbulent condition, the thickness is perpendicular to the inner wall, and the thickness direction of different parts of the inner wall can be different because the perpendicular direction can be different.

The axial length of the thickened area is 45-55% of the axial length of the non-return seam, namely about 1/2, so as to obtain satisfactory effect.

When the inner wall of the conical body is provided with a plurality of inner convex ribs extending along the direction of the generatrix, the front ends of the inner convex ribs are preferably positioned in the thickened section, and the rear ends of the inner convex ribs are preferably positioned in the area provided with the outer annular flange, so that the integral strength is formed.

The rear end of the cone may be provided with an outer annular flange 83 perpendicular to the axial direction, which enhances the resistance to deformation in the circumferential direction while facilitating installation.

When the cone is provided with a thickened region, the thickness of the outer annular flange is preferably greater than the thickness of the cone outside the thickened region; when the cone is not provided with a thickened region, the thickness of the outer annular flange is preferably greater than the thickness of the cone.

The cone is provided with the inner wall in the area of the annular flange is in the shape of an arc surface 85 protruding outwards, so that resistance is reduced, sufficient strength is formed at the rear end, the maximum circumference is formed, deformation is easy, and the overall strength can be obviously improved after the arc surface is arranged.

The pipeline safety protection device provided by the invention is characterized in that a safety protection valve is additionally arranged in front of the existing pipeline valve, the safety protection valve can be any one of the safety protection valves disclosed by the invention, the pipeline valve is positioned behind the safety protection valve, and the outlet end of the pipeline valve is connected with the inlet end of the safety protection valve. When pipeline damage in the front leads to pressure to descend by a wide margin, the action of safety protection valve gets into the closed condition, cuts off the medium passageway, and when pipeline valve shut off the back, the safety protection valve resumes normally open state again.

The front direction of the invention refers to the direction of the medium flow in the pipeline under the normal use state.

The technical means disclosed by the invention can be combined arbitrarily to form a plurality of different technical schemes except for special description and the further limitation that one technical means is another technical means.

Claims

1. A safety protection valve comprises a valve body provided with an inlet and an outlet, and is characterized in that a valve seat, a valve clack and a return spring are arranged in a medium passage of the valve body, the valve seat is fixedly arranged in front of the valve clack and is provided with a central through hole forming the medium passage in the valve body, the valve clack is movably arranged in the valve body, a moving gap is reserved between the valve clack and the inner wall of the valve body, the valve clack and the valve seat are respectively provided with mutually matched sealing surfaces to jointly form a sealing pair of the valve, the rear end surface of the valve clack is an inwards concave curved surface, two ends of the return spring are respectively connected with the valve body and the valve clack, the return spring is provided with a pre-deformation generating a backward acting force to the valve clack, an elastic check piece is arranged in front of the valve seat and is conical, the vertex of the conical shape is, the non-return seams are formed on the cone, the front ends of the non-return seams are gathered at the top point of the cone, a plurality of inner convex ribs extending along the direction of a bus are arranged on the inner wall of the cone, the number of the inner convex ribs is the same as that of the non-return seams and are distributed alternately in the circumferential direction, the inner convex ribs are circumferentially positioned at the center of two adjacent non-return seams, therefore, each convex rib is arranged on the center line of a triangular plate separated from the adjacent non-return seams on the cone, the axial front part of the cone is a thickened area, and the thickness of the thickened area is gradually increased from back to front.

2. The safety valve as claimed in claim 1, wherein the return spring comprises a tension spring and/or a thrust spring, the tension spring has a front end connected to the valve flap and a rear end connected to the valve body, and the thrust spring has a front end connected to the valve body and a rear end connected to the valve flap.

3. The safety valve as claimed in claim 2, wherein the valve body and the valve seat are coaxial tubular bodies, the outer side surface of the valve seat is sealed with the inner wall of the valve body, the valve flap has a cylindrical shape, the sealing surface of the valve seat is located at the rear end of the valve seat, and the sealing surface of the valve flap is located at the front end of the valve flap.

4. The safety valve of claim 3 wherein said seat sealing surface and said flap sealing surface are in the combination of any of the following shapes:

are all annular planes which are vertical to the axial line of the valve body;

one is an annular plane perpendicular to the valve body axis, and the other is an annular convex surface;

one is an annular conical surface, and the other is an annular spherical surface of a spherical crown-shaped curved surface;

one is an annular conical surface and the other is an annular plane.

5. A safety protection valve according to any one of claims 1 to 4, wherein a valve flap rear stop is provided in the valve body, the valve flap rear stop being located behind the valve flap, the valve flap rear stop being fixedly mounted in the valve body and being provided with a medium passage for the passage of a medium.

6. The safety protection valve according to any one of claims 1 to 4, wherein a plug having a central through hole is provided at the front end of the valve body, the inner diameter of the central through hole of the plug is smaller than the outer diameter of the valve seat, the rear portion of the central through hole of the valve seat is a stepped hole, the valve seat is fitted into the stepped hole, and the outer side surface thereof is sealed with the inner wall of the central through hole of the plug.

7. The safety protection valve according to claim 6, wherein the valve body and the valve seat are both tubular, the valve flap is cylindrical in shape, the return spring is a pre-compressed coil spring, and is sleeved on the valve flap with a gap from the outer side of the valve flap, the front end of the coil spring abuts against or is fixedly connected to the valve seat or the plug, the rear end of the coil spring abuts against or is fixedly connected to the rear portion of the valve flap, a valve flap rear blocking frame blocking the rear of the valve flap is arranged in the valve body, the front end of the coil spring abuts against the valve seat or the valve body, and the rear end of the coil spring abuts against or is fixedly connected to the rear portion of the valve flap, so that the valve body or the valve seat is connected.

8. The safety protection valve according to claim 6, wherein a connection pipe section for connecting an external pipeline extends from the front part of the plug, the connection pipe section is provided with a pipeline quick-connection joint or is not provided with the pipeline quick-connection joint, a guide column extends from the front end of the valve flap, the diameter of the guide column is smaller than that of the main body part of the valve flap, a guide structure matched with the guide column is arranged on the valve seat and/or the plug, and a medium channel is arranged on the cross section of the guide structure.

9. A pipeline safety protection device comprising a pipeline valve and further comprising a safety protection valve according to any one of claims 1 to 8, said pipeline valve being located behind said safety protection valve and having an outlet end connected to an inlet end of said safety protection valve.