WO2014003215A1

WO2014003215A1 - Watertight shaft housing structure for butterfly valve

Info

Publication number: WO2014003215A1
Application number: PCT/KR2012/005050
Authority: WO
Inventors: 윤석현; 윤일중; 김영길; 전인
Original assignee: 주식회사 에이치케이밸브
Priority date: 2012-06-26
Filing date: 2012-06-26
Publication date: 2014-01-03

Abstract

The present invention relates to a watertight shaft housing structure for a butterfly valve and, in particular, has the effects: preventing a fluid from infiltrating the shaft housing part of a body in which a butterfly valve shaft is inserted; securing the watertightness of the shaft housing part of a butterfly valve as well as using a bushing having a certain structure, a resin, and a plurality of O-rings formed to enclose the inner surface and the outer surface of the bushing so as not to affect the torque of the shaft; extending the service life of a valve by blocking fluid infiltration at the shaft housing part of the butterfly valve and preventing corrosion of the shaft housing part; and preventing water contamination when the butterfly valve is used in a water supply pipe by preventing fluid contamination due to corrosion of the shaft housing portion.

Description

Airtight Watertight Structure of Butterfly Valve

The present invention relates to a butterfly valve mounted on a water supply pipe, a sewage pipe, etc., to maintain airtightness by a disc, and relates to a watertight structure for blocking fluid penetration of a body housing portion of a valve into which a shaft is inserted. To prevent the fluid from penetrating into the axial part into which the shaft of the valve is inserted, a resin is provided to surround the inner and outer surfaces of the bush, and a plurality of O-rings are inserted into the inner surface of the bush, thereby making it susceptible to corrosion. This is a technique for the watertight structure of the butterfly valve of the butterfly valve that protects the bearing portion from corrosion.

Butterfly valves mounted on water pipes are classified into rubber seat butterfly valves and metal seat butterfly valves according to the type of seat. These butterfly valves control the fluid by the rotation of a circular or elliptical disk inside the body. A shaft is inserted to rotate the disk, which is inserted through the disk and the body of the valve.

The butterfly valves anticorrosive surfaces that the fluid touches to prevent corrosion by the fluid. The inner surface of the butterfly valve and the disk are the areas where the fluid always touches, so they are thoroughly treated. In addition, the outer surface of the body that is not in contact with the fluid is subjected to anticorrosive treatment to prevent corrosion. Where the anticorrosive treatment is difficult is the axial housing part of the body into which the shaft is inserted. The axial housing portion is a portion into which the shaft for supporting and driving the disk is inserted, which requires high precision, and thus it is difficult to perform separate anticorrosion processing.

In order to protect the axle portion of the butterfly valve from corrosion, it is best to prevent fluid penetration. Each butterfly valve has a structure for blocking the penetration of the fluid, but in reality it is impossible to completely prevent the blocking of the fluid. This is because the shaft is transmitted with a strong torque for driving the disk. When the fluid barrier property is increased, the torque of the shaft increases, and the o-ring inserted for the purpose of fluid blocking hardens over time and does not perform its role.

The life of a butterfly valve depends on the environment in which it is used, typically 10 to 20 years. The main reason why the valve can not be repaired at this time is the severe corrosion of the axle. That is, the main reason for determining the life of the butterfly valve is the corrosion of the enclosure portion, because it does not completely block the fluid penetrating into the enclosure portion.

Corrosion due to fluid infiltration of the shaft portion of the butterfly valve not only acts to shorten the life of the valve, but also causes contamination of the fluid. In particular, when the butterfly valve is connected to the water supply pipe, it becomes a great cause of contaminating the melted water quality due to the corrosion of the axial housing part.

Accordingly, the present invention has been conceived to solve the above problems, an object of the present invention is to provide a watertight watertight structure of a butterfly valve which prevents fluid from penetrating into the watertight portion of the body into which the axis of the butterfly valve is inserted.

It is another object of the present invention to ensure the watertightness of the axial part of the butterfly valve, but not to affect the torque of the shaft, a bush having a specific structure, a resin molded to surround the inner and outer surfaces of the bush and a plurality of O-rings It is to provide a watertight structure for the fly valve of the fly valve.

Another object of the present invention is to provide a watertight watertight structure of a butterfly valve that can extend the life of the valve by blocking fluid penetration of the watertight portion of the butterfly valve to prevent corrosion of the watertight portion.

Another object of the present invention is to provide a water-sealing structure of a butterfly valve which can prevent stigma of water when the butterfly valve is used in a water supply pipe by preventing contamination of the fluid by corrosion of the water-sealing portion.

In the butterfly valve installed in the pipeline for transporting the fluid according to a preferred embodiment of the present invention for achieving the above object is composed of a cylindrical body and a disk disk to control the flow of the fluid by the rotation of the disk, the end portion The outer diameter groove 11 is formed on the outer surface and the inner groove 12 is formed on the inner surface corresponding to the outer diameter groove 11, a plurality of inner o-ring grooves 13 are formed in the central portion of the inner surface A cylindrical bush 10 made of metal to be inserted into the axial housing 60 of the valve body; Resin 23 of the elastic material is formed while wrapping including one side inner groove 12 and the outer diameter groove 11 of the bush (10); And a plurality of O-rings 24 inserted into the plurality of inner O-ring grooves 13 of the bush 10. Characterized in that it comprises a.

In the present invention, the bush 10 has an outer O-ring groove 14 is formed on the outer surface, the outer O-ring groove 14 is a rectangular O-ring 24 is inserted into the shape of the cross section protruding corner It features.

In the present invention, the bush 10 is the inner end groove 15 is formed on the inner surface of the distal end in the opposite direction to the disk 40, a plurality of the inner end groove 15 is pressed by the presser 80 O-ring 24 is characterized in that is inserted.

In the present invention, the O-ring 24 is inserted into the plurality of inner O-ring grooves 13 of the bush 10 is characterized in that the cross-sectional shape of the square protruding corners.

In addition to the butterfly valve for controlling the flow of the fluid by the rotation of the disk is composed of a cylindrical body and a disk disk is installed in the pipeline for transporting the fluid according to another preferred embodiment of the present invention for achieving the above object The outer diameter groove 11 is formed on the outer surface of the distal end, and the inner groove 12 is formed on the inner surface corresponding to the outer diameter groove 11, and a plurality of inner o-ring grooves 13 are formed on the central portion of the inner surface. A cylindrical bush 10 formed of a metal material inserted into the axial housing 60 of the valve body; A disk-shaped mold 20 having a cylinder having the same outer diameter as the shaft 50 of the valve on one side and having an inlet 21 and an air outlet 22 formed therein; An elastic material resin 23 formed by mounting the mold 20 at the inlet of the celebratory housing 60 and covering and enclosing the inner side groove 12 and the outer diameter groove 11 of the bush 10; And a rectangular O-ring 24 having a corner protruding in the shape of a cross section inserted into the plurality of inner O-ring grooves 13 of the bush 10. Characterized in that it comprises a.

As described above, the watertight housing watertight structure of the butterfly valve according to the present invention has the following effects.

First, the present invention can prolong the life of the valve by blocking the fluid penetration of the portion of the housing 60 of the butterfly valve to prevent corrosion of the housing.

Second, the present invention can prevent the contamination of the fluid due to corrosion of the axial housing portion, it is possible to prevent the stigma of water when using the butterfly valve in the water supply pipe.

Third, the present invention prevents fluid from penetrating into the shaft portion of the body into which the shaft of the butterfly valve is inserted.

Fourth, the present invention uses a bush of a specific structure, a resin molded to surround the inner and outer surfaces of the bush and a plurality of O-rings so as not to affect the torque of the shaft while ensuring the watertightness of the shaft portion of the butterfly valve.

1 is a view showing the structure of a conventional butterfly valve.

Figure 2 is a view showing the watertight housing watertight structure of a conventional butterfly valve.

Figure 3 is a view showing the watertight housing watertight structure of the butterfly valve according to an embodiment of the present invention.

4 is a view showing a mold mounting state for molding the resin included in the present invention.

5 is a view showing a bush included in the present invention.

Fig. 6 is a view showing (a) front view and (b) side view of a mold for molding the resin included in the present invention.

7 is a view showing an O-ring included in the present invention.

Hereinafter, with reference to the accompanying drawings the present invention will be described in detail.

1 is a structure of a conventional butterfly valve, Figure 2 is a view showing the watertight housing structure of the conventional butterfly valve. The conventional butterfly valve shown is a rubber seat butterfly valve, the material of the seat to block the fluid is expressed as rubber sheet rubber. Since this part is not included in the scope of the present invention, a detailed description thereof will be omitted. The present invention covers all kinds of butterfly valves.

As shown, a cylindrical bush 10 of bronze or brass is inserted into the inner surface of the celebrity housing 60 of the body, and a shaft 50 of a stainless steel material is inserted through the bush 10. The body 30 of the valve typically uses a ductile (Ducktile, GCD 450) and the material of the axial housing 60 is the same as the material of the body (30).

As shown, the penetration of fluid into the housing 60 begins at the point where the through-hole (not shown) portion of the body 30 is in contact with the outer surface of the shaft 50 for penetrating the shaft 50. . This part is also the part where the metal body 30 and the metal shaft 50 are in contact with each other, but because the shaft 50 is a part that rotates, it is difficult to prevent the penetration of the fluid. As shown, the means for preventing the penetration of fluid into the enclosure 60 portion of the butterfly valve is an O-ring 24. The O-ring 24 is inserted between the stepped portion of the body 30 and the bush 10, the O-ring 24 is pressed by the compression of the shaft cover 70 or the presser 80 to maintain the watertightness have.

In order to drive the valve, the disk 40 must be rotated and the shaft 50 must be rotated for this purpose. As time passes, the rubber O-ring 24 hardens or ages to change physical properties such as elastic force. Will lose its original functionality. In this case there is no longer any means to shut off the fluid once it has passed through the portion with the o-ring 24. When the fluid penetrates into the celebratory housing 60, the inner surface of the celebratory housing 60 of ductile material, which is the most vulnerable material to corrosion, is rapidly corroded. The shaft 50 and the bush 10 are made of stainless steel and brass or bronze, which are resistant to corrosion, so that corrosion damage due to fluid penetration is relatively low.

3 is a view showing the watertight watertight structure of the butterfly valve according to an embodiment of the present invention, Figure 4 is a view showing a mold mounting state for molding the resin included in the present invention, Figure 5 is the present invention 6 and (b) are views showing (a) a front view and (b) a side view of a mold for molding a resin included in the present invention. Penetration of the fluid into the portion of the turret housing 60 proceeds along the outer and inner surfaces of the bush 10. Therefore, in order to complete the watertight structure of the conical housing 60, each watertight means for the outer side and the inner side of the bush 10 is required.

3 and 5, the bush 10 included in the present invention is a cylindrical cylindrical metal, the outer diameter groove 11 is formed on the outer surface of the distal end portion corresponding to the outer diameter groove 11 An inner groove 12 is formed on the inner surface, and a plurality of inner o-ring grooves 13 are formed on the central portion of the inner surface, and inner terminal grooves 15 are formed on the inner surface of the distal end of the disk 40. Protruding step 16 is formed on the outer surface corresponding to the inner end groove 15.

In order to prevent fluid from penetrating along the outer surface of the bush 10, the bush 10 is inserted into the housing 60, the mold 20 is mounted, and the resin 23 in the liquid state is transferred to the mold 20. Inject into the injection hole 21 formed in the). When the resin 23 in the liquid state is cured and hardened, the mold 20 is removed, and the resin 23 is formed by wrapping one end portion of the bush 10. That is, the resin 23 is formed while covering the inner groove 12 and the outer diameter groove 11 of one side of the bush 10. The resin 23 thus formed serves to block the fluid from penetrating along the outer surface of the bush 10.

As shown in Figs. 3 and 4, the resin 23 may use a conventional elastic body, and includes all the elastic bodies having water tightness, including a polymer compound such as rubber or urethane. The kind of resin 23 is not contained in the summary of this invention, and a normal watertight body will correspond to this. As shown in FIG. 6, in order to mold the resin 23, a separate mold 20 is required, and the mold 20 generally includes an injection port 21 for injecting the resin 23 in a liquid state and air. The air outlet 22 to be discharged is formed. The resin 23 in the liquid state hardens while filling the space formed by the mold 20, the bush 10, and a part of the body 30. Since the specific method of shape | molding the resin 23 changes with kinds of resin 23, detailed description is abbreviate | omitted.

Blocking fluid penetrating along the outer surface of the bush 10 is formed on the outer surface of the bush 10 and the resin 23 molded to surround the inner and outer surfaces of the bush 10. O-ring 24 is inserted into the O-ring groove (14). The O-ring 24 inserted into the outer O-ring groove 14 is inserted in case the resin 23 does not perform its function. The O-ring 24 has a rectangular cross section protruding from the corner. It is desirable to. The o-ring 24 inserted into the outer o-ring groove 14 should be inserted before molding the resin 23.

7 is a view showing a cross-sectional shape of the O-ring included in the present invention. The fluid penetration of the butterfly valve body 30 into the part of the housing 60 is made not only on the outer side of the bush 10 but also on the inner side. As described above, the method of blocking the fluid penetrating along the outer surface of the bush 10 by the O-ring 24 inserted into the resin 23 and the outer O-ring groove 14. As shown in FIG. 7, in order to block the fluid penetrating along the inner surface of the bush 10, in the present invention, a plurality of O-rings are inserted into the plurality of inner o-ring grooves 13 formed on the inner surface of the bush 10. Provide 24.

As shown in FIG. 7, the plurality of O-rings 24 included in the present invention includes a circular, elliptical, and quadrangular protruding corners. In particular, the rectangular O-ring 24 having the shape of the cross section protruding from the corner portion has an advantage of maintaining watertightness regardless of the type of the fluid or the size of the pressure. Therefore, in order to enhance the effect of the present invention, it is preferable that the o-ring 24 uses a rectangular o-ring 24 having a protruding edge.

In order to block the fluid penetrating along the inner surface of the bush 10, in the present invention, a plurality of O-rings 24 are sequentially inserted and finally inserted into the inner end groove 15 of the bush 10 O-ring 24 plays its role. The plurality of O-rings 24 inserted into the inner end grooves 15 of the bush 10 are pressed by the presser 80 to maintain watertightness.

As described above, the watertight watertight structure of the butterfly valve can be applied to a water pipe or a sewer pipe.

Claims

In the butterfly valve installed in the pipeline for transporting the fluid and consisting of a cylindrical body and a disk disk to control the flow of the fluid by the rotation of the disk,

An outer diameter groove 11 is formed on the outer side of the distal end, and an inner groove 12 is formed on the inner surface corresponding to the outer diameter groove 11, and a plurality of inner o-ring grooves 13 are formed on the central portion of the inner surface. A cylindrical bush 10 formed of a metal material inserted into the axial housing 60 of the valve body;

Resin 23 of the elastic material is formed while wrapping including one side inner groove 12 and the outer diameter groove 11 of the bush (10); And

A plurality of O-rings 24 inserted into the plurality of inner O-ring grooves 13 of the bush 10; The watertight housing watertight structure of the butterfly valve, characterized in that it comprises a.
The method of claim 1,

The bush 10 has an outer o-ring groove 14 is formed on the outer surface, the butterfly valve, characterized in that the outer o-ring groove 14 is a rectangular O-ring 24 is inserted into the shape of the cross section protruding corners. Congratulations
The method of claim 1,

The bush 10 has an inner end groove 15 formed at the inner side of the distal end of the disk 40 in the opposite direction, and a plurality of O-rings 24 are pressed into the inner end groove 15 by the presser 80. Celebration housing watertight structure of the butterfly valve, characterized in that.
The method of claim 1,

O-ring (24) is inserted into the plurality of inner o-ring grooves 13 of the bush 10 is a water-sealing structure of the butterfly valve, characterized in that the cross-sectional shape is a rectangular protrusion protruding corner.
In the butterfly valve installed in the pipeline for transporting the fluid and consisting of a cylindrical body and a disk disk to control the flow of the fluid by the rotation of the disk,

An outer diameter groove 11 is formed on the outer side of the distal end, and an inner groove 12 is formed on the inner surface corresponding to the outer diameter groove 11, and a plurality of inner o-ring grooves 13 are formed on the central portion of the inner surface. A cylindrical bush 10 formed of a metal material inserted into the axial housing 60 of the valve body;

A disk-shaped mold 20 having a cylinder having the same outer diameter as the shaft 50 of the valve on one side and having an inlet 21 and an air outlet 22 formed therein;

An elastic material resin 23 formed by mounting the mold 20 at the inlet of the celebratory housing 60 and covering and enclosing the inner side groove 12 and the outer diameter groove 11 of the bush 10; And

A rectangular O-ring 24 having a corner protruding in the shape of a cross section inserted into the plurality of inner O-ring grooves 13 of the bush 10; The watertight housing watertight structure of the butterfly valve, characterized in that it comprises a.