JPH027340Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a valve sealing structure that forms an annular filling space of a liquid sealant between the seat surfaces of a valve body and a valve body that slide into contact in a closed state. . Furthermore, this seal structure has the advantage that even if the valve body side seat and valve body side seat surfaces are made of hard materials such as metal materials, the liquid sealant can be used to reliably seal between both seat surfaces. .

[Conventional technology]

In the past, for example, the Utility Application shown in Figure 5 of the drawings
-101216 (Utility Model No. 57-23743), a semicircular annular groove 31 whose depth is 1/2 of the opening width,
It was formed on the seat surface 30a of the valve box side seat 30 to serve as a filling space for the liquid sealant.

[Problem that the invention attempts to solve]

As mentioned above, in the past, an annular groove with a semicircular cross section was formed on the seat surface next to the valve box.
This conventional technique has the drawback that the liquid sealing material cannot be spread throughout the groove for the following reason, and sealing performance is partially impaired.

The first reason is that because the depth of the groove is larger than the opening width of the groove, it is difficult for the sealing material to separate from the groove, and the old sealing material solidifies and prevents the flow of the new sealing material.

The second reason is that foreign matter, such as sand, rust, or welding slag, contained in the transferred fluid, which has a size approximately equal to the cross-sectional shape of the sealing material filling space that is formed when the valve is closed, may cause the valve to open. When the sealant is in the condition, the remaining sealant gets absorbed into the groove and gets into the groove. As a result, the annular path constituting the sealing material filling space is divided by this foreign object, and the liquid sealing material cannot be distributed throughout the groove.

The third reason is that in the cross-sectional shape of the sealing material filling space, the intersection angle (approximately 90 degrees) between the groove curved surface and the valve body seat surface is large, so the direction in which the sealant is removed is perpendicular to the seat surface. It was easy to be limited in direction and difficult to separate from the groove. In other words, even if a moving force in the direction parallel to the seat surface is applied to the sealing material by opening and closing the valve body, the sealing material gets caught on the opening edge of the groove and cannot be removed. It was impossible to remove it.

The present invention solves the above problems and provides a valve seal structure that has a self-cleaning effect and does not allow entry of large foreign substances.

[Means for solving problems]

The technical feature of the present invention is that an annular groove whose cross section is a concave curved surface and whose depth is smaller than 1/2 of the opening width is formed at opposing locations on each of the seat surfaces, and when the valve is closed, these two grooves are closed. In addition, an annular space having a convex lens shape with a flat cross section is formed to serve as a filling space for the liquid sealing material.

[Effect]

The configuration of the present invention operates as follows. That is, in the valve closed state, a large passage cross-sectional area necessary for the flow of the liquid sealant is ensured by the two grooves coming together. In addition, when the valve is in the open state, the filled sealing material is divided into the annular groove on the side of the valve body and the annular groove on the side of the valve body, and the sealing material is divided into the annular groove on the side of the valve body and the annular groove on the side of the valve body. The possibility of detachment of the sealing material due to contact with fluid in the valve state is doubled, and by dividing the groove, the cross-sectional area is halved when the valve is closed, thereby preventing foreign matter of a larger size from entering. Furthermore, when the valve is in the middle of opening and closing, the shallow and flat convex lens-shaped groove shape and the moving force applied to the sealing material in a direction parallel to the seat surface during opening and closing operations prevent old sealing material and large foreign objects from being removed. To discharge so as to slide out without being caught or the like.

[Effect of idea]

As is already clear from the above explanation, according to the technical means of the present invention, a large passage cross-sectional area is ensured in the valve closed state, thereby reducing passage resistance when the liquid sealant is distributed throughout the groove. While I could,
When the valve is open, the sealing material filled in the groove can be easily removed from the groove, and during the opening and closing of the valve, the sealing material and foreign matter can be effectively removed using the opening and closing operations of the valve. Moreover, unlike in the past, the annular groove is not divided by foreign matter, and even if it is possible to enter, only small foreign matter can enter. Therefore, the flow of the sealing material is not hindered by foreign matter, and the flow of the sealing material is prevented as a whole. The sealing material can be distributed throughout the annular groove.

Next, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 1, the valve body 2 is formed by welding the valve body parts 2a, 2a, which are provided with welded connection parts for various fluid transport pipes 1, 1, and the valve body 2b. A cylindrical valve body 3 having an inner diameter approximately equal to the path diameter,
A pair of valve rods 4a, 4b are integrally connected in a state perpendicular to the cylinder axis of the valve body 3, and both valve rods 4a, 4b
is rotatably supported in the valve box main body 2b, and one valve stem 4a is made to penetrate and project from the valve box main body 2b, and the valve stem 4 protrudes from the valve box main body 2a.
A valve opening/closing mechanism 6 equipped with a manual operation handle 5 is interlocked and connected to the valve box portions 2a and 2b.
A seal structure 7 is provided between the valve body 3 and the valve body 3.
A ball valve is configured to open and close the flow path within the valve box.

As shown in FIGS. 1 and 2, the seal structure 7 includes an annular position regulating member 8 inside the valve box portion 2a on the back side thereof, and an annular valve box seat on the end side. 9 are screwed onto the valve body 3 so as to be freely threadable in the direction of distance from and near the valve body 3, and are elastically displaced in the direction of the threading of the sheet 9 between the end surfaces of the regulating member 8 and the seat 9 to form a valve box side seat 9. A bullet 10 is interposed to press and urge the valve body 3 toward the valve body 3 side, and the seat surface S of the seat 9 on the valve body side is shaped like a truncated conical circumferential surface or a substantially truncated conical circumferential surface such as a spherical surface. At the same time, the backlash at the threaded portion A of the seat 9 with respect to the valve body portion 2a is configured to be relatively effective. On the other hand, the sheet 9 has a circular flat plate portion 11a having a relatively small wall thickness and having a substantially equal thickness throughout.
A valve body seat 11 is formed by integrally molding a counter valve box seat portion 11b formed in surface contact with the seat surface S of the valve body so as to extend over the entire circumference of the flat plate portion 11a. It is attached to the central part of the valve body 3 in a state in which it is brought into contact with the supporting part 3a which is integrally extended to the body 3, and the counter valve box seat part 11b
In the seat surface T of the valve box seat 9 and the seat surface S of the valve box seat 9, the inclination angles of both T and S are set so that the inclination angle of the seat portion 11b with respect to the radially extending surface of the flat plate portion 11a is relatively small. ,and,
A liquid sealing material supply mechanism 12 is provided for the contact portions of both T and S and the fitting contact portion of the valve box seat 9 and the valve box portion 2a.

In configuring the liquid sealant supply mechanism 12,
An annular groove a to be filled with a liquid sealing material is formed on the fitting contact surface U of the valve box portion 2a with respect to the valve box seat material 9, and a seat surface S on the valve box 9 side and a seat surface on the valve body 3 side are formed. Annular grooves b and c are formed in each of T to be filled with liquid sealing material in the valve closed state, O-rings 13 and 13 are provided on both sides of the valve box groove a, and the valve box groove a A flow path d that communicates and connects the groove b of the valve box seat surface S is formed in the valve box seat 9, and in the valve box portion 2a,
A flow path e is formed to connect a supply pipe 14 for a liquid sealing material such as grease, and to communicate and connect the supply pipe 14 and the valve box groove a.

As shown in FIG. 3, the grooves b and c on both sheet surfaces S and T are formed so that the depth H is smaller than half of the opening width D when viewed in cross section, and when they are combined, The shape is formed into a convex lens shape with a flat cross section, so that the sealing material can be filled into the grooves b and c in a state where it can be easily removed. More specifically, the sealing material filled in the grooves b and c is exposed to mechanical vibrations applied when opening and closing the valve, or contact with fluid in the valve open state.
Furthermore, as the valve body seat 11 slides with respect to the valve body seat 9 when the valve is opened and closed, for example, the fourth
As shown in Figure A, when the valve is opened, the valve body seat 11 locks the seal material in the valve body groove b, and the valve body seat 9 locks and releases the seal material in the valve body groove C. , and as shown in FIGS. 4B and 4C, when the valve is closed, the valve body seat 11 scrapes off the sealing material that has adhered and accumulated on the valve body seat 9, thereby causing the grooves b and c to be removed. The sealing material is removed from the grooves b, c, and as a result, the entirety of the grooves b, c can be appropriately filled with the liquid sealing material in the valve closed state.

The seal structure of the present invention is preferably used for ball valves, but may also be applied to butterfly valves, gate valves, and slide valves.

[Brief explanation of the drawing]

Figure 1 is a cutout side view of the ball valve, Figure 2 is a cutout side view of the seal structure, Figure 3 is a cutout side view of the groove, and Figure 4 A, B, and C show the opening and closing operation states. Side view FIG. 5 is a side view of a conventional example. 2... Valve box, 3... Valve body, S, T... Seat surface, b, c... Groove, H... Depth, D... Opening width.

Claims (1)

[Scope of utility model registration request] In a valve seal structure that forms an annular filling space for liquid sealing material between the seat surfaces S and T of the valve body 2 and the valve body 3 that are in sliding contact in the closed state, the cross section is a concave curved surface and the depth H is the opening width. an annular groove b smaller than 1/2 of D;
c are formed at opposite locations of the respective seat surfaces S and T, and when the valve is closed, these two grooves b and c are combined to form an annular space having a convex lens shape with a flat cross section, and the liquid sealing material is A valve seal structure characterized by a filling space.