CN212377329U - Sealing structure for valve rod of butterfly valve - Google Patents

Abstract

The utility model discloses a seal structure for butterfly valve rod, it includes disk seat, valve gap and valve rod the disk seat with be equipped with sealed clamping ring between the valve gap, sealed clamping ring cover is located on the valve rod, the cover is equipped with o type sealing washer on the valve rod, sealed clamping ring is pressed and is located the top of o type sealing washer, be equipped with on the anchor ring of sealed clamping ring with the disk seat with the corresponding logical groove of being connected of bolt hole on the valve gap, the bolt runs through bolt hole on the disk seat connect logical groove on the sealed clamping ring with bolt hole on the valve gap will the disk seat sealed clamping ring with the valve gap compresses tightly fixed connection. The utility model effectively solves the problem of air leakage of the valve rod of the butterfly valve under the condition of not stopping the gas transmission, greatly reduces the maintenance cost, and has convenient and rapid installation and high maintenance efficiency; the utility model discloses a sealed clamping ring be the metal material, and the security performance is good, long service life, and is with low costs.

Description

Sealing structure for valve rod of butterfly valve

The technical field is as follows:

the utility model relates to a seal structure especially relates to a seal structure for butterfly valve rod.

Background art:

in the process of gas distribution, the butterfly valve is an indispensable part of a gas facility. The gas pipelines commonly used by people are underground, and valves for controlling gas delivery are mostly arranged in underground valve wells. And the valve rod of the butterfly valve in the valve well can cause air leakage of the valve rod of the butterfly valve due to factors such as medium erosion, temperature change, self abrasion, aging of a sealing ring and the like. Once the valve rod of the butterfly valve leaks gas, great potential safety hazard exists, the concentration of the leaked gas in a closed space reaches 5%, and explosion can be generated when the leaked gas meets open fire, so that the butterfly valve is very dangerous.

At present, a butterfly valve rod leaks gas to maintain or replace the butterfly valve, gas transmission is required to be stopped, and then all gas in a gas pipe network is replaced and removed to implement the butterfly valve, however, the gas removed in the pipe network is huge in quantity, long in consumed time, waste of a large amount of gas is caused, and the maintenance cost is high; if the gas pipe network design adopts the mode that one butterfly valve is used for later use, the pipe network design is complicated, the equipment input cost is high, and simultaneously, the spare butterfly valve still has the butterfly valve rod gas leakage problem that causes because of factors such as medium erosion, temperature variation, sealing washer ageing.

Therefore, the problem that the valve rod of the gas leakage butterfly valve is required to be repaired safely at low cost under the condition of not delivering fuel gas continuously is solved urgently at present.

The utility model has the following contents:

an object of the utility model is to provide a low cost, installation safety, convenient, efficient are used for the seal structure of butterfly valve rod.

The purpose of the utility model is implemented by the following technical scheme: a sealing structure for a valve rod of a butterfly valve comprises a valve seat, a valve cover and a valve rod, wherein one end of the valve rod is fixedly connected with a valve plate in the valve seat, the other end of the valve rod penetrates through the valve seat, extends into the valve cover and is connected with a driving mechanism in the valve cover, and the valve rod is connected with the valve seat in a sealing and rotating mode; and a sealing component is arranged between the valve seat and the valve cover.

Preferably, seal assembly is including sealed clamping ring, sealed clamping ring cover is located on the valve rod, the cover is equipped with o type sealing washer on the valve rod, sealed clamping ring is pressed and is located the top of o type sealing washer, be equipped with on the anchor ring of sealed clamping ring with the disk seat with the corresponding logical groove of being connected of bolt hole on the valve gap, the bolt runs through bolt hole on the disk seat connect logical groove on the sealed clamping ring with bolt hole on the valve gap, will the disk seat sealed clamping ring with the valve gap compresses tightly fixed connection.

Preferably, the thickness of the sealing press ring is 2-3 mm.

Preferably, the inner ring of the sealing pressure ring is provided with a chamfer of 45-60 degrees, the chamfer face is an arc face or a plane, and the o-shaped sealing ring is pressed below the chamfer. On one hand, the chamfer angle gives the o-shaped sealing ring with pressure inclining towards the direction of the valve rod, so that the sealing effect between the o-shaped sealing ring and the valve rod can be increased, and on the other hand, the damage of the o-shaped sealing ring caused by direct downward pressing is avoided; the chamfer face is an arc face, so that the effects of compressing and protecting the o-shaped sealing ring can be further achieved.

Preferably, the lower surface of the sealing pressure ring is provided with a sealing groove along the circumferential direction of the ring surface, and a sealing ring is arranged in the sealing groove, so that the effect of further sealing can be achieved.

The sealing press ring is made of metal.

Preferably, the driving mechanism is a worm gear mechanism or a wrench.

The utility model has the advantages that: 1. the sealing ring with the thickness of 2-3mm is sleeved on the valve rod between the valve seat and the valve cover of the butterfly valve on the premise of not influencing the service performance of other parts of the butterfly valve, and the valve rod is fastened through the original valve cover matched fastening bolt, so that a new sealing structure is added to the butterfly valve rod, and the problem of air leakage of the butterfly valve rod is effectively solved; 2. the sealing ring mounting process does not influence the sealing function of the original butterfly valve rod sealing assembly, so that the sealing structure of the butterfly valve rod of the utility model can be mounted and used under the condition of not stopping gas transmission, only the good ventilation of the valve well is needed to be kept, other auxiliary equipment is not needed, and the maintenance cost is greatly reduced; 3. when the sealing structure of the butterfly valve rod of the utility model is replaced or installed, only the valve cover and the driving mechanism need to be removed, then the sealing compression ring is installed, and then the driving mechanism and the valve cover are installed, so that the sealing structure is convenient and quick to install and has high maintenance efficiency; 4. the utility model discloses a sealed clamping ring be the metal material, and the security performance is good, long service life, and is with low costs.

Description of the drawings:

FIG. 1 is a schematic view of a sealing structure for a valve stem of a butterfly valve.

Fig. 2 is a schematic view of a sealing ring structure.

Figure 3 is a cross-sectional view of the sealing collar.

Disk seat 1, valve gap 2, valve rod 3, sealed clamping ring 4, gas buffer slot 5 connect logical groove 6, sealing washer 7, o type sealing washer 8.

The specific implementation mode is as follows:

example 1: the utility model provides a seal structure for butterfly valve rod, its includes disk seat 1, valve gap 2 and valve rod 3, 3 one end of valve rod and the inside valve plate fixed connection of disk seat 1, the other end is worn out disk seat 1 and is extended to inside the valve gap 2 to be connected with the inside actuating mechanism of valve gap 2, this embodiment actuating mechanism is worm gear mechanism. The valve rod 3 is connected with the valve seat 1 in a sealing and rotating way; be equipped with sealed clamping ring 4 between disk seat 1 and valve gap 2, on valve rod 3 was located to sealed clamping ring 4 cover, the cover was equipped with o type sealing washer 8 on the valve rod 3, and the top of o type sealing washer 8 is located in the pressure of sealed clamping ring 4, and the thickness of sealed clamping ring 4 is 2-3mm, and the thickness of the sealed clamping ring 4 of this embodiment is 2.5 mm. The inner ring of the sealing compression ring is provided with a chamfer of 45-60 degrees, the chamfer face is an arc face or a plane, and the o-shaped sealing ring is pressed below the chamfer. On one hand, the chamfer angle gives the o-shaped sealing ring with pressure inclining towards the direction of the valve rod, so that the sealing effect between the o-shaped sealing ring and the valve rod can be increased, and on the other hand, the damage of the o-shaped sealing ring caused by direct downward pressing is avoided; the chamfer face can further play the effect of compressing tightly and protecting o type sealing washer for the arcwall face, and this embodiment chamfer design is 45 degrees. The lower surface of the sealing clamping ring 4 of the embodiment is provided with a sealing groove 5 along the circumferential direction of the ring surface, and a sealing ring 7 is arranged in the sealing groove 5, so that the effect of further sealing can be achieved. The sealing press ring 4 of the present embodiment is a metal sealing press ring. The ring surface of the sealing press ring 4 is provided with a connecting through groove 6 corresponding to the bolt holes in the valve seat 1 and the valve cover 2, the bolt penetrates through the bolt hole in the valve seat 2, the connecting through groove 6 in the sealing press ring 4 and the bolt hole in the valve cover 2, and the valve seat 1, the sealing press ring 4 and the valve cover 2 are tightly and fixedly connected.

4 processes of installation sealing ring do not influence former butterfly valve rod seal assembly and play sealed effect, consequently, the utility model discloses the seal structure of butterfly valve rod can install and use under the condition of incessantly defeated gas, only need keep the valve well ventilate can, also need not other auxiliary assembly, greatly reduced maintenance cost. The utility model discloses the seal structure of butterfly valve rod only needs to demolish valve gap 2 and actuating mechanism when changing or installing, then installs sealed clamping ring 4, again with actuating mechanism and valve gap 2 install can, simple to operate, swift, maintenance efficiency is high.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. A sealing structure for a valve rod of a butterfly valve comprises a valve seat, a valve cover and a valve rod, wherein one end of the valve rod is fixedly connected with a valve plate in the valve seat, the other end of the valve rod penetrates through the valve seat, extends into the valve cover and is connected with a driving mechanism in the valve cover, and the valve rod is connected with the valve seat in a sealing and rotating mode; the valve is characterized in that a sealing assembly is arranged between the valve seat and the valve cover.

2. The sealing structure for the butterfly valve rod of claim 1, characterized in that, sealing assembly includes sealed clamping ring, sealed clamping ring cover is located on the valve rod, the cover is equipped with o type sealing washer on the valve rod, sealed clamping ring is pressed and is located the top of o type sealing washer, be equipped with on the anchor ring of sealed clamping ring with the disk seat with the corresponding logical groove of being connected of bolt hole on the valve gap, the bolt runs through bolt hole on the disk seat connect logical groove on the sealed clamping ring with bolt hole on the valve gap, will the disk seat seal the clamping ring with the valve gap compresses tightly fixed connection.

3. A sealing arrangement for a butterfly valve stem according to claim 2, in which the sealing collar is 2-3mm thick.

4. A sealing structure for a butterfly valve rod according to claim 3, characterized in that the inner ring of the sealing press ring is provided with a chamfer of 45-60 degrees, the chamfer surface is an arc surface or a plane, and the o-shaped sealing ring is pressed below the chamfer.

5. A sealing structure for a butterfly valve rod according to claim 2, wherein a sealing groove is formed in the lower surface of the sealing pressing ring along the circumferential direction of the ring surface, and a sealing ring is arranged in the sealing groove.

6. A sealing structure for a butterfly valve stem according to any of claims 2 to 5, characterized in that the sealing collar is a metal sealing collar.

7. A sealing structure for a butterfly valve stem according to claim 6, wherein the drive mechanism is a worm gear mechanism or a wrench.

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