CN212509599U

CN212509599U - Anti-scouring wedge type gate valve

Info

Publication number: CN212509599U
Application number: CN202020855463.7U
Authority: CN
Inventors: 胡隆; 胡胜聪; 余朝阳
Original assignee: Zhejiang Golden Ball Valve Co ltd
Current assignee: Zhejiang Golden Ball Valve Co ltd
Priority date: 2020-05-20
Filing date: 2020-05-20
Publication date: 2021-02-09
Anticipated expiration: 2030-05-20

Abstract

The utility model provides an anti-scouring wedge gate valve belongs to the valve field, including valve body, valve gap, valve rod, valve plate, disk seat and hand wheel, state and be equipped with the disk seat seal face on the terminal surface of disk seat, the peripheral department of the outer terminal surface relative with the disk seat of valve plate is equipped with the valve plate seal face, a buffering recess has been seted up on the outer terminal surface of valve plate, the bore of buffering recess is greater than the aperture of disk seat, be equipped with unsmooth profile of tooth wall groove on the cell wall of buffering recess. The utility model discloses set up the buffering recess that has special construction, through the heavy-calibre and the profile of tooth wall slot isotructure of buffering recess, carry out water conservancy diversion, buffering to the medium, slow down the speed in the clearance that the medium formed when getting into the valve plate and opening relatively with the disk seat or closing to the reduction is to the impact force of the sealed face of valve plate and disk seat, delays the damaged speed of sealed face, improves the life of valve.

Description

Anti-scouring wedge type gate valve

Technical Field

The utility model relates to a valve field especially relates to a wedge gate valve of sealed face scour protection.

Background

A gate valve is a valve in which a movement direction of a gate plate is perpendicular to a flow direction, and the gate valve is sealed by contact between a valve seat and the gate plate. The gate valve can only be fully opened and fully closed, and cannot be adjusted and throttled.

The sealing matching structure of the valve plate and the valve seat of the existing common gate valve is sealed at the end face of the valve seat as shown in figure 1 of the attached drawings of a wedge-type ceramic slag guide gate valve which is used for preventing slag from accumulating at the bottom and is wear-resistant in China patent No. CN200420029889.8, or sealed at the sharp corner of the joint of the hole wall of the valve seat and the end face of the hole wall as shown in figures 1 and 2 of the attached drawings of the wedge-type sealing gate valve in China patent No. CN 201420610865.5.

At the sealed cooperation department of above-mentioned two kinds of valve plates and disk seats, when the valve rod drives the disk seat and opens or close a little, the clearance between valve plate and the disk seat is narrow and small, and the sealed face of valve plate and disk seat will be washed away to the medium, has accelerated the crushing speed of the sealed face of valve plate and disk seat, and then appears leaking even sealed inefficacy, reduces the life of valve.

Based on this, the present application is proposed.

Disclosure of Invention

The utility model provides a not enough to prior art, the utility model provides an anti-scour wedge gate valve solves among the prior art at the in-process that opens and close, and the sealed face of valve plate and the sealed face of disk seat are washed away and the easy damaged problem by the medium widely when valve plate and disk seat closely contact, reduces the impact force of medium to the valve plate, prolongs the life of valve plate.

In order to achieve the above object, the utility model discloses scour prevention wedge gate valve's structure as follows: comprises a valve body, a valve cover, a valve rod, a valve plate, a valve seat and a hand wheel. The valve plate is characterized in that a valve seat sealing surface is arranged on the end face of the valve seat, a valve plate sealing surface is arranged on the periphery of the outer end face of the valve plate, which is opposite to the valve seat, and the valve plate sealing surface is in sealing fit with the valve seat sealing surface when the valve rod drives the valve plate to move. The valve plate is characterized in that the outer end face of the valve plate is provided with a buffer groove, the caliber of the buffer groove is larger than the aperture of the valve seat, and the groove wall of the buffer groove is provided with a concave-convex tooth-shaped wall groove.

Above-mentioned structure is through setting up the buffering recess and making its bore greater than the disk seat aperture, the closed angle department of disk seat is just setting up to buffering recess, with sealed cooperation department "hide" behind the closed angle department of disk seat, so the medium need walk around the closed angle department earlier just can remove to the sealed cooperation department of valve plate and disk seat, open, when closed, a large amount of media enter into the buffering recess earlier, the lateral wall of rethread buffering recess climbs to sealed cooperation department, can slow down the speed of most medium through the buffering recess, the crooked route that the reunion closed angle provided, the velocity of flow of medium can effectively be slowed down. Meanwhile, the tooth-shaped wall groove also disturbs the medium flowing through, and the effect of slowing down the flow velocity of the medium is improved.

For further improvement block the medium that gets into in the buffering recess, reduce its speed and to the impact force of the sealed face of valve plate, the utility model discloses further set up as follows: and an inner blocking wall is arranged adjacent to the groove wall of the buffer groove in a clearance fit manner, one end of the inner blocking wall is fixed on the groove bottom of the buffer groove, the other end of the inner blocking wall inclines towards one side of the central shaft of the valve plate, and the outer end of the inner blocking wall does not exceed the plane where the sealing surface of the valve plate is located.

Through the structure, when the sealing surface of the valve plate is in sealing fit with the sealing surface of the valve seat, the inner blocking wall is in clearance fit with the sharp corner of the valve seat, so that a medium channel at the sharp corner is reduced, a first blocking defense line is formed, and the flow rate and the impact force of a medium are reduced. Meanwhile, the blocking wall can guide partial media to the center along the inclined direction of the blocking wall, and the media flowing to the sealing matching position of the valve seat and the valve plate are reduced, so that the impact of the media on the sealing surface of the valve plate and the sealing surface of the valve seat is reduced.

For avoiding the clearance between interior fender wall and the disk seat closed angle department too big, the utility model discloses further set up as follows: the inclination angle of the inner blocking wall is 10-20 degrees.

For ensuring the buffering effect, the utility model discloses further set up as follows: the groove depth of the buffer groove is not less than 5 mm.

For avoiding the direct clearance department of rushing into from the sealed face of valve plate and the sealed face of disk seat of medium, in order to ensure that the closed angle department and the profile of tooth wall slot of disk seat are to the upset of medium and slow down the effect, the utility model discloses further set up as follows: the diameter difference between the caliber of the buffer groove and the caliber of the valve seat is at least 8 mm.

The utility model discloses further set up as follows: the edge of the opening of the valve seat close to the opening on one side where the valve plate is located is provided with a slope inclined to the opening of the valve seat, and the inclination angle of the slope is not smaller than that of the inner blocking wall. Through the slope, the flow of the passing medium to the axis of the opening of the valve seat can be guided, so that the medium enters the buffer groove to slow down the flow speed of the medium.

For preventing that excessive slope leads to the medium velocity of flow to increase, the utility model discloses further set up as follows: the inclination angle of slope is 12 ~ 22.

The utility model discloses further set up as follows: and a hydraulic buffer is sleeved on the valve rod above the valve cover and is in sealing connection with the valve rod. Through the hydraulic buffer, when the hand wheel rotates to drive the valve rod to rotate, the resistance of the valve rod to move is increased when the valve rod is about to approach the starting point or the end point of the stroke in the process of moving up and down, so that the torsion force required by the hand wheel rotation is increased, an operator is warned, and the adverse effect caused by the fact that the hand wheel excessively rotates to cause the valve rod to exceed the stroke range of the valve rod is prevented.

The utility model has the advantages as follows:

the utility model discloses set up the buffering recess that has special construction, through the heavy-calibre and the profile of tooth wall slot isotructure of buffering recess, carry out water conservancy diversion, buffering to the medium, slow down the speed in the clearance that the medium formed when getting into the valve plate and opening relatively with the disk seat or closing to the reduction is to the impact force of the sealed face of valve plate and disk seat, delays the damaged speed of sealed face, improves the life of valve.

Drawings

Fig. 1 is a schematic view of the overall structure of embodiment 1 of the present invention.

Fig. 2 is a partially enlarged schematic view of fig. 1.

Fig. 3 is a schematic diagram of the medium flow in embodiment 1 of the present invention.

Fig. 4 is a schematic structural diagram of embodiment 2 of the present invention.

Fig. 5 is a schematic diagram of the medium flow according to embodiment 2 of the present invention.

Fig. 6 is a schematic structural diagram of embodiment 3 of the present invention.

FIG. 7 is a schematic view of a hydraulic buffer according to an embodiment of the present invention

Fig. 8 is a left side view of the structure of fig. 7.

Reference numerals: 1-hand wheel, 2-valve stem, 3-valve cover, 4-valve body, 5-valve plate, 6-valve seat, 7-hydraulic buffer;

201-diaphragm, 202-orifice, 401-inflow channel, 402-outflow channel, 501-left side plate, 502-buffer groove, 503-castellated wall groove, 504-valve plate sealing surface, 505-inner retaining wall, 601-valve seat sealing surface, 602-inner hole, 603-valve seat end surface, 604-ramp, 701-hydraulic chamber, 701 a-slow chamber, 701 b-fast chamber.

Detailed Description

Embodiment 1 combines to show in fig. 1, fig. 2, and this embodiment provides an anti-scouring wedge gate valve, and it includes valve body 4, valve gap 3, valve rod 2, valve plate 5, disk seat 6 and hand wheel 1, and valve rod 2 and hand wheel 1 screw thread transmission are connected, and the well lower part of valve rod 2 wears to locate valve gap 3 and valve body 4 lid and closes and form the cavity in, and the inflow passageway 401 and the outflow passageway 402 that are equipped with horizontal arrangement with this cavity intercommunication. The connection parts of the inflow channel 401 and the outflow channel 402 with the cavity are respectively provided with a valve seat 6, the valve seat end surface 603 is provided with a valve seat sealing surface 601, the valve plate 5 is fixedly connected to the bottom end of the valve rod 2, the periphery of the outer valve seat end surface 603 of the valve plate 5 opposite to the valve seat 6 is provided with a valve plate sealing surface 504, and the valve plate sealing surface 504 is in sealing fit with the valve seat sealing surface 601 when the valve rod 2 drives the valve plate 5 to move. The outer valve seat end surface 603 of the valve plate 5 is provided with a buffer groove 502, the caliber of the buffer groove 502 is larger than the caliber of the valve seat 6, so that the sharp corner of the valve seat 6 is arranged right opposite to the buffer groove 502, and the sealing matching part is 'hidden' behind the sharp corner of the valve seat 6, thereby slowing down the flow rate of the medium.

The buffer groove 502 should have a certain groove depth D2 of not less than 5mm, and for this reason, the groove bottom of the buffer groove 502 may be set to an inclined plane having a certain inclination angle with the vertical plane. As shown in fig. 1, in this embodiment, the number of the tooth-shaped wall grooves 503 at the top of the left side plate 501 is greater than the number of the tooth-shaped wall grooves 503 at the bottom of the left side plate 501, which is set to adapt to the groove depth of the buffer groove 502, and if necessary, the groove depth of the buffer groove 502 can be increased by increasing the thickness of the valve plate 5, so as to increase the number of the protrusions and recesses of the tooth-shaped wall grooves 503, and when the number of the protrusions and recesses is sufficient (the number of the protruding portions is more than 3), the number of the protrusions and recesses of the tooth-shaped wall grooves 503 at the top and the bottom of the left side plate 501 can be kept consistent.

As shown in FIG. 3, the above structure enlarges the caliber of the buffer groove 502 to be larger than the caliber of the valve seat 6, and combines with the curved path provided by the sharp corner, so that when the medium flows to the valve plate 5, most of the medium enters the buffer groove 502, and a small part of the medium firstly bypasses the sharp corner or flows back to the sealing matching part of the valve seat sealing surface 601 and the valve plate sealing surface 504 along the tooth-shaped wall groove 503, and the two media will be disturbed mutually at the merging part, thereby effectively slowing down the flow rate of the medium. In the above process, the castellated wall grooves 503 also disturb the medium flowing through, which can help to improve the effect of slowing down the flow rate of the medium.

In this embodiment, to ensure that the medium enters the buffer groove 502 first, the diameter difference D1 between the aperture of the buffer groove 502 and the aperture of the valve seat 6 is at least 8 mm.

Example 2 this example differs from example 1 in that: as shown in fig. 4 and 5, an inner blocking wall 506 is disposed adjacent to the groove wall of the relief groove 502 in a clearance fit manner, one end of the inner blocking wall 506 is fixed to the groove bottom of the relief groove 502, the other end of the inner blocking wall is inclined toward the central axis side of the valve plate 5, the inclination angle α is 10 to 20 °, and the outer end of the inner blocking wall 506 does not exceed the plane where the valve plate sealing surface 504 is located. The inner abutment wall 506 is a clearance fit with the sharp corner of the valve seat 6 where an inner relief groove, approximately triangular in shape, is formed, through which the medium must be decelerated when it flows towards the sealing engagement. In addition, the clearance fit between the inner blocking wall 506 and the sharp corner of the valve seat 6 reduces the medium passage at the sharp corner, thereby forming a blocking line and helping to reduce the flow rate and impact force of the medium, so as to reduce the impact of the medium on the valve plate sealing surface 504 and the valve seat sealing surface 601.

Embodiment 3 this embodiment differs from the above embodiments in that: the edge of the opening of the valve seat 6 on the side close to the valve plate 5 is provided with a slope 604 inclined toward the opening of the valve seat 6, and the inclination angle of the slope 604 is not smaller than that of the inner blocking wall 506. In one embodiment, the slope 604 is inclined at an angle β of 12-22 °. The slope 604 can guide the passing medium to the axial center of the opening of the valve seat 6, so that the medium enters the buffer groove 502 to slow down the flow rate.

Above-mentioned embodiment, for warning operating personnel, prevent that hand wheel 1 from excessively rotating and leading to valve rod 2 to surpass its stroke scope and produce harmful effects. A hydraulic buffer 7 can be sleeved on the valve rod 2 above the valve cover 3, the hydraulic buffer 7 comprises a shell and a spacer 201, the spacer 201 is fixed on the valve rod 2 and is arranged in a hydraulic cavity 701 in the shell, and the hydraulic cavity 701 is filled with buffer liquid, such as hydraulic oil, through an oil injection hole. The upper and lower ends of the hydraulic chamber 701 are provided with a slow chamber 701a adapted to the shape of the diaphragm 201, and a fast chamber 701b is arranged between the slow chambers 701a at the upper and lower ends of the hydraulic chamber 701. And the diaphragm 201 is provided with an orifice 202 through which hydraulic oil passes. The hydraulic buffer 7 is connected with the valve rod 2 in a sealing way.

When the diaphragm 201 moves up and down with the fast chamber 701b, the hydraulic buffer can rapidly pass through the gap between the diaphragm 201 and the fast chamber 701b in fig. 8, and the valve rod 2 moves up and down without hindrance. When the diaphragm 201 moves from the fast chamber 701b to the slow chamber 701a, since the slow chamber 701a is shaped to conform to the fast chamber 701b, hydraulic oil can only move from the slow chamber 701a to the fast chamber 701b through the orifice 202, and the movement of the valve stem 2 is hindered in the process. Through the hydraulic buffer 7, when the hand wheel 1 rotates to drive the valve rod 2 to rotate, and the valve rod 2 is about to approach the starting point or the end point of the stroke in the process of moving up and down, the resistance of the movement of the valve rod 2 is increased, and further the torsion force required by the rotation of the hand wheel 1 is increased, so that the stroke range of the valve rod 2 is reminded in advance for operators.

In addition, in order to mount the spacer 201, the case may be divided into upper and lower portions, and the connection may be assembled by sealing the connection with a sealing member.

Claims

1. The anti-scouring wedge-type gate valve is characterized in that a buffering groove is formed in the outer end face of the valve plate, the caliber of the buffering groove is larger than the aperture of the valve seat, and concave-convex tooth-shaped wall grooves are formed in the groove wall of the buffering groove.

2. The erosion prevention wedge gate valve of claim 1, wherein: and an inner blocking wall is arranged adjacent to the groove wall of the buffer groove in a clearance fit manner, one end of the inner blocking wall is fixed on the groove bottom of the buffer groove, the other end of the inner blocking wall inclines towards one side of the central shaft of the valve plate, and the outer end of the inner blocking wall does not exceed the plane where the sealing surface of the valve plate is located.

3. The erosion prevention wedge gate valve of claim 2, wherein: the inclination angle of the inner blocking wall is 10-20 degrees.

4. An anti-scour wedge gate valve according to any one of claims 1 to 3, wherein: the groove depth of the buffer groove is not less than 5 mm.

5. The erosion prevention wedge gate valve of claim 4, wherein: the diameter difference between the caliber of the buffer groove and the caliber of the valve seat is at least 8 mm.

6. The erosion prevention wedge gate valve of claim 3, wherein: the edge of the opening of the valve seat close to the opening on one side where the valve plate is located is provided with a slope inclined to the opening of the valve seat, and the inclination angle of the slope is not smaller than that of the inner blocking wall.

7. The erosion prevention wedge gate valve of claim 6, wherein: the inclination angle of slope is 12 ~ 22.

8. An anti-scour wedge gate valve as claimed in any one of claims 1, 2, 3, 5, 6, 7, wherein: and a hydraulic buffer is sleeved on the valve rod above the valve cover and is in sealing connection with the valve rod.