CN217842721U

CN217842721U - Butterfly valve sealed by extrusion secondary

Info

Publication number: CN217842721U
Application number: CN202221160985.0U
Authority: CN
Inventors: 杨克洁; 周锡江; 谢海冬; 黄显尧
Original assignee: Zhejiang Weiguang Valve Manufacturing Co ltd
Current assignee: Zhejiang Weiguang Valve Manufacturing Co ltd
Priority date: 2022-05-12
Filing date: 2022-05-12
Publication date: 2022-11-18
Anticipated expiration: 2032-05-12

Abstract

The utility model discloses a butterfly valve through extrusion secondary seal belongs to the valve field, including disk seat and case, install the valve plate on the case, install the extrusion seat on the disk seat, the valve plate includes fixed plate and stripper plate, be equipped with the clearance between fixed plate and the stripper plate, still install secondary extrusion ring between the outer edge of fixed plate and stripper plate, take place the extrusion back between stripper plate and the extrusion seat, thereby because secondary extrusion ring is located between fixed plate and the stripper plate, can receive the extrusion and take place radial ascending deformation in side to produce the extrusion between messenger's secondary extrusion ring and the extrusion seat, thereby realize the secondary seal, solved prior art butterfly valve in long-term use, because wearing and tearing, lead to the problem that sealing performance reduces even sealed inefficacy easily.

Description

Butterfly valve sealed by extrusion secondary

Technical Field

The utility model belongs to the technical field of the valve and specifically relates to a butterfly valve through extrusion secondary seal is related to.

Background

The butterfly valve is a regulating valve with simple structure, and can be used for the on-off control of low-pressure pipeline medium, i.e. a valve whose closing member is a disk and can be rotated around the valve shaft to open and close, and can be used for controlling the flow of various fluids of air, water, steam, various corrosive media, slurry, oil product, liquid metal and radioactive medium, etc. and mainly playing the role of cutting off and throttling on the pipeline. The butterfly valve opening and closing member is a disc-shaped butterfly plate, and rotates around its own axis in the valve body, thereby achieving the purpose of opening and closing or adjusting.

Because the medium that controls the flow, electric butterfly valve need often close the valve plate and open, when closing the valve plate and open, the valve plate often contacts with the sealing member, wears to cause the sealing member sealing performance to reduce easily to the sealing member.

For example, the chinese patent literature discloses "a steam turbine communicating pipe pressure control butterfly valve", its bulletin number is CN208417554U, including valve body and valve plate, the valve plate set up in the inside of valve body, the both sides of valve plate all are through taper pin fixedly connected with valve shaft, two the both sides rotation connection of high temperature bearing and valve body inner wall is passed through to the one end that the valve shaft is from, the surface of valve shaft and the junction of valve body are provided with flexible graphite, and the top of valve body is provided with flow control device, and the left end fixedly connected with bull stick of valve shaft, the left end of bull stick run through the valve body and extend to the outside of valve body, and the surface of bull stick and the department of running through of valve body are provided with first filler. The pressure regulating butterfly valve of the communicating pipe of the steam turbine has the advantages that the operation and maintenance of the flow regulating device are convenient when the pressure regulating butterfly valve is used, the clamping of the regulating screw rod caused by overhigh temperature can be avoided, the long-time normal operation of the flow regulation of a pipeline system can be ensured, the structure of the valve is compact, the maintenance is convenient, and the flow resistance is small; however, this patent has a disadvantage in that the valve plate thereof is easily worn during long-term use, resulting in a reduction in sealing performance.

SUMMERY OF THE UTILITY MODEL

The utility model relates to an overcome prior art butterfly valve in long-term use, because wearing and tearing lead to sealing performance to reduce the condition of sealing failure even easily, provide a butterfly valve through extrusion secondary seal, can still have better leakproofness after the valve plate takes place the wearing and tearing of certain degree.

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

the utility model relates to a butterfly valve through extrusion secondary seal, including disk seat and case, install the valve plate on the case, install the extrusion seat on the disk seat, the valve plate includes fixed plate and stripper plate, be equipped with the clearance between fixed plate and the stripper plate, still install secondary extrusion ring between the outer edge of fixed plate and stripper plate, the disk seat is including the first disk seat portion and the second valve seat portion that are located the case both sides respectively, the extrusion seat and the fixed plate contact of first disk seat portion, the extrusion seat of second valve seat portion contacts with stripper plate and secondary extrusion ring simultaneously.

After taking place the extrusion between stripper plate and the extrusion seat, because secondary extrusion ring is located between fixed plate and the stripper plate, thereby can receive the extrusion and take place radial ascending deformation of side to make and produce the extrusion between secondary extrusion ring and the extrusion seat, thereby realize the secondary seal, lead to the stripper plate wearing and tearing back when the butterfly valve in long-term use, secondary extrusion ring can also play sealed effect, after secondary extrusion ring produces wearing and tearing, stripper plate and fixed plate increase the extrusion volume of secondary extrusion ring, thereby ensure sealed effect all the time.

Preferably, a fixing plate groove is formed in the fixing plate, an extrusion plate groove is formed in the extrusion plate, an extrusion ring groove is formed by combining the fixing plate groove and the extrusion plate groove, and the secondary extrusion ring is installed in the extrusion ring groove.

Preferably, the valve core comprises a mounting seat and two valve rods arranged on two sides of the mounting seat, and the valve rods are fixedly connected with the mounting seat.

Preferably, the two valve rods are respectively connected with the valve seat through a shaft head sealing structure, the shaft head sealing structure comprises self-lubricating bearings arranged on the outer sides of two ends of the valve core, bushings are arranged on the outer sides of the self-lubricating bearings, and thrust blocks are arranged at one ends of the bushings, facing the outer side of the valve seat; the self-lubricating bearing can make the valve rod more smooth in the rotation, and the bushing and the thrust block are used for limiting the self-lubricating bearing.

Preferably, a YX-type seal is installed between the bush and the stem.

Preferably, a packing groove is formed in one side of the thrust block, graphite packing is filled in the packing groove, and a packing gland is installed at an opening of the packing groove.

Preferably, the valve rod is connected with the mounting seat through a bolt, the bolt simultaneously penetrates through the valve rod and the mounting seat, and the bolt and the mounting seat are fixed through welding; this structure can improve the reliability of installation between valve rod and the mount pad to, because the bolt is in the not welded installation, can carry out certain relative rotation between valve rod and the mount pad, avoided because the position precision of valve rod mounting hole is not enough to lead to the condition that the unable simultaneous installation of both sides valve rod, reduced the assembly degree of difficulty.

Therefore, the utility model discloses following beneficial effect has: (1) The valve plate can still have better sealing property after being worn to a certain degree; and (2) the assembly difficulty is low, and the reliability is high.

Drawings

Fig. 1 is a schematic front view of the present invention.

Fig. 2 is a schematic cross-sectional view of the present invention.

Fig. 3 is an enlarged view of a portion of the present invention at the second seat portion and squib seat contact of fig. 1.

Fig. 4 is a partial enlarged view of the present invention at the installation of the valve stem of fig. 2.

In the figure: 1. the device comprises a valve seat 2, a valve core 3, a valve plate 4, an extrusion seat 5, a fixing plate 6, an extrusion plate 7, a secondary extrusion ring 8, a clamping groove 9, a threaded section 10, an optical axis section 11, a mounting seat 12, a valve rod 13, a plug 14, a self-lubricating bearing 15, a bushing 16, a thrust block 17, an O-shaped sealing ring 18, a YX-shaped sealing ring 19, graphite packing 20, a packing gland 21, a symmetrical shaft 22 and a valve rod axis.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description.

In the embodiment shown in fig. 1-4, a butterfly valve sealed by extrusion twice comprises a valve seat 1 and a valve core 2, wherein a valve plate 3 is mounted on the valve core, an extrusion seat 4 is mounted on the valve seat, the valve plate comprises a fixed plate 5 and an extrusion plate 6, a gap is arranged between the fixed plate and the extrusion plate, a twice extrusion ring 7 is further mounted between the outer edges of the fixed plate and the extrusion plate, a clamping groove 8 is formed in the fixed plate, the twice extrusion ring is mounted on the clamping groove, the valve seat comprises a first valve seat part and a second valve seat part which are respectively positioned at two sides of the valve core, the extrusion seat of the first valve seat part is in contact with the fixed plate, and the extrusion seat of the second valve seat part is in contact with the extrusion plate and the twice extrusion ring; the fixed plate is provided with a fixed plate groove, the extrusion plate is provided with an extrusion plate groove, the fixed plate groove and the extrusion plate groove are combined to form an extrusion ring groove, an opening is formed in one side of the extrusion ring groove facing the extrusion seat, and the secondary extrusion ring is installed in the extrusion ring groove; the fixing plate is connected with the extrusion plate through a connecting bolt, the connecting bolt comprises a thread section 9 and an optical axis section 10, the thread section is installed in the fixing plate, and the optical axis section is installed in a connecting through hole of the extrusion plate in a matching mode; the valve core comprises an installation seat 11 and two valve rods 12 arranged on two sides of the installation seat, the two valve rods respectively penetrate through two valve rod holes of the valve seat, the valve rods are fixedly connected with the installation seat, the valve rods are connected with the installation seat through bolts 13, the bolts penetrate through the valve rods and the installation seat simultaneously, and the bolts and the installation seat are fixed through welding; the two valve rods are respectively connected with the valve seat through shaft head sealing structures, each shaft head sealing structure comprises a self-lubricating bearing 14 installed on the outer sides of two ends of a valve core, a bushing 15 is installed on the outer side of each self-lubricating bearing, a thrust block 16 is arranged at one end, facing the outer side of the valve seat, of each bushing, and an O-shaped sealing ring 17 is installed between the outer side of each bushing and a valve rod hole; a YX-shaped sealing ring 18 is arranged between the bushing and the valve rod; a packing groove is formed in one side of the thrust block, graphite packing 19 is filled in the packing groove, and a packing gland 20 is installed at an opening of the packing groove; the distance between a symmetrical shaft 21 of the valve seat parallel to the axis of the valve rod and the axis 22 of the valve rod is 30mm.

In the process that the butterfly valve is closed, with the visual angle of fig. 1, the case rotates clockwise, and the lower part of the fixed plate of case extrudees with first disk seat portion left, and the upper portion of the extrusion board of case extrudees with the second disk seat portion right, and simultaneously, because the upper portion of case extrusion board is pressed to the fixed plate, the secondary that is located between fixed plate and the extrusion board extrudees and extrudees with the extrusion seat.

When leading to the stripper plate wearing and tearing because long-term the use, can guarantee the sealed effect of butterfly valve through the secondary extrusion ring, when the secondary extrusion ring wearing and tearing, the displacement amount that the stripper plate was pressed to the fixed plate can increase to continuously guarantee the sealed effect of secondary extrusion ring.

Claims

1. The utility model provides a butterfly valve through extrusion secondary seal, includes disk seat and case, characterized by, install the valve plate on the case, install the extrusion seat on the disk seat, the valve plate includes fixed plate and stripper plate, be equipped with the clearance between fixed plate and the stripper plate, still install the secondary extrusion ring between the outer edge of fixed plate and stripper plate, the disk seat is including the first disk seat portion and the second valve seat portion that are located the case both sides respectively, the extrusion seat and the fixed plate contact of first disk seat portion, the extrusion seat of second valve seat portion contacts with stripper plate and secondary extrusion ring simultaneously.

2. The butterfly valve with the secondary seal through extrusion of claim 1, wherein a fixing plate groove is formed in the fixing plate, an extrusion plate groove is formed in the extrusion plate, the fixing plate groove and the extrusion plate groove are combined to form an extrusion ring groove, and the secondary extrusion is installed in the extrusion ring groove.

3. The butterfly valve sealed by extrusion twice as claimed in claim 1, wherein the valve core comprises a mounting seat, and two valve rods mounted on two sides of the mounting seat, and the valve rods are fixedly connected with the mounting seat.

4. The butterfly valve with the secondary seal through extrusion of claim 3, wherein the two valve rods are respectively connected with the valve seat through a spindle nose seal structure, the spindle nose seal structure comprises self-lubricating bearings installed at the outer sides of the two ends of the valve core, a bushing is installed at the outer side of the self-lubricating bearings, and a thrust block is arranged at one end of the bushing, which faces the outer side of the valve seat.

5. A butterfly valve with secondary seal by extrusion according to claim 4, in which a YX-type seal is fitted between the bush and the stem.

6. The butterfly valve with the secondary seal through extrusion of claim 4, wherein a packing groove is formed on one side of the thrust block, graphite packing is filled in the packing groove, and a packing gland is installed at an opening of the packing groove.

7. The butterfly valve with the secondary seal through extrusion of claim 3, wherein the valve rod is connected with the mounting seat through a plug pin, the plug pin penetrates through the valve rod and the mounting seat simultaneously, and the plug pin is fixed with the mounting seat through welding.