JPH047401Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field of the Invention The present invention relates to a gate valve device mainly used in a large-diameter flow passage of fluid transport piping such as a chiller.

(b) Prior art and its problems Conventionally, a main body has a flow passage therein and a valve chamber extending perpendicularly to the axis of the flow passage, and a main body that extends inside the valve chamber and is rotatably supported by the main body. An internally threaded type comprising a spindle and a hollow valve body whose base is screwed onto the spindle, whose tip is formed into a spherical shape, and which opens and closes the flow path by moving forward and backward along the inner wall of the valve chamber. In the gate valve device of
A structure is known in which an elastic cover is fitted and adhered to the spherical tip of the hollow valve body (Utility Model Act 1973-
28767 etc.). In this type of gate valve device, if the valve body is made of synthetic resin such as vinyl chloride resin, the elastic cover cannot be vulcanized and bonded. A common method is to provide each in the forward and backward movement direction of the valve body, and on the other hand, provide a protrusion that fits into this groove on the inner peripheral surface of the elastic cover, and then fit them together and fix them with adhesive. It is used.

However, in such a valve body structure, when the valve is closed, the elastic cover is pressed against the valve seat part of the main body, so the elastic cover is pushed out to the upstream and downstream sides of the flow path, especially in the part that contacts the side surface of the flow path. A directional force acts. In this state, if high fluid pressure is applied from the upstream side of the flow path, fluid pressure will act on the elastic cover portion facing the downstream flow path in addition to the extrusion force, so the elastic cover will become more biased.
Eventually, the adhesive may peel off, causing the elastic cover to separate from the valve body and pop out into the downstream flow path. For this reason, a problem arises in that when the gate valve device is opened, the valve body cannot be moved and the valve no longer functions.

In the valve structure disclosed in Japanese Utility Model Publication No. 34-12075, four or more protrusions and grooves extending in the forward and backward direction of the valve body are provided on the outer peripheral surface of the valve body and the inner peripheral surface of the elastic cover. They fit into each other. Therefore, the adhesion between the valve body and the elastic cover is relatively high.

However, in the above-mentioned conventional valve structure, the valve body is provided with a hollow part having a female threaded part that engages with the male threaded part of the spindle. Solid particles and foreign matter accumulate in the threaded part and hollow part, making it impossible for the spindle and the valve body to screw together smoothly, increasing the handle torque, making it difficult to operate the handle, and impeding the sealing performance of the valve. Further, since solid particles and foreign matter accumulate in the thread groove, wear occurs on the male threaded portion and the female threaded portion due to friction when the spindle and the valve body are engaged with each other.

(c) Purpose of the invention The purpose of the invention is to strengthen the fit between the valve body and the elastic cover to prevent the elastic cover from peeling off from the valve body, and at the same time to strengthen the threaded part between the spindle and the valve body. The goal is to maintain the sealing performance of the valve by protecting it from solid particles and foreign matter in the fluid and ensuring that the valve opens and closes reliably.

(d) Structure of the device and its operation In order to achieve the above object, the present invention includes a main body having a flow passage therein and a valve chamber extending perpendicularly to the axis of the flow passage; It includes a spindle rotatably supported by the main body, a valve body whose tip has a substantially spherical outer surface, and an elastic cover that is fitted and bonded to the outside of the valve body. It has a hollow part that opens at the end, and a female threaded part is formed on the inner surface of the hollow part on the proximal end side of the valve body, and the valve body and the elastic body are connected by rotation of a spindle screwed into the female threaded part. The cover opens and closes the flow path of the main body by moving back and forth along the inner wall of the valve chamber, and the valve body has four or more grooves extending in the direction of movement of the valve body on its outer circumferential surface. In a gate valve device in which the elastic cover has a protrusion on its inner circumferential surface that fits into the groove, the inner diameter of the hollow part of the valve element is located at the center of the tip of the valve element and the elastic cover. A communicating small hole with a diameter smaller than that of the valve body is provided to enable communication between the valve body and the flow path of the main body. To provide a gate valve device characterized in that a projection formed around a small hole is fitted.

According to the above configuration of the present invention, small holes communicating with each other are provided at the central positions of the tips of the valve body and the elastic cover, and these small holes communicate the fluid flow path with the hollow part of the valve body. Therefore, when the valve is opened, fixed particles and foreign matter in the fluid accumulated in the hollow part of the valve body and the threaded part (thread groove) between the valve body and the spindle can escape into the fluid flow path through the small hole. becomes. That is, since negative pressure is generated in the small hole and the hollow part of the valve body due to the flow of the fluid, most of the fixed particles and foreign matter in the fluid accumulated inside the valve body are drawn out into the flow path.

Further, when the valve is closed, these small holes serve as escape ports for solid particles and foreign matter in the fluid stagnant at the valve seat portion of the main body, so no foreign matter is present between the valve body and the flow path surface.

In particular, in the present invention, a small hole with a diameter smaller than the inner diameter of the hollow part of the valve body is formed at the center position of the tip of the valve body and the elastic body cover, so that the tip of the valve body has a substantially spherical surface and It is possible to minimize the reduction in the area of close contact with the body cover and prevent a decrease in the strength of the connection between the valve body and the elastic body cover.Moreover, due to the noise effect of the small hole, the inside of the hollow part of the valve body can be This makes it possible to efficiently suck out and draw in solid particles and foreign matter from the fluid.

Furthermore, in the present invention, since the protrusion formed on the periphery of the elastic cover fits into the groove formed on the periphery of the small hole at the center of the tip of the valve body, the valve body and The elastic cover is fitted and fixed. In this way, the elastic cover is reliably positioned on the valve body by fitting the protrusion and the groove at the small hole, so that the elastic cover and the valve body may not be small due to peeling and deformation of the elastic cover due to fluid pressure. There is no possibility that the small hole of the valve body will be blocked due to the position of the hole being shifted. Therefore, when the valve is opened, solid particles and foreign matter in the fluid that have entered the hollow part of the valve body can be reliably discharged from the small holes of the valve body and the elastic cover into the fluid flow path of the valve body. Further, when the valve is closed, solid particles and foreign matter in the fluid that have accumulated in the valve seat portion of the valve body, that is, the abutting portion of the tip of the elastic cover can reliably escape into the hollow portion of the valve body.

(e) Effects of the invention Since the invention has the above-mentioned structure and function, solid particles and foreign matter in the fluid do not accumulate in the hollow part of the valve body or the threaded part between the valve body and the spindle, so that the valve body The threaded connection between the shaft and the spindle is maintained smoothly, and there is almost no wear on the threaded portion. Therefore, the valve can be opened and closed easily and smoothly. Therefore, it is inevitable that the sealing ability of the valve can be maintained over a long period of time.

(F) Embodiment An embodiment illustrating a specific example of the present invention will be described below with reference to FIGS. 1 to 4.

Referring to FIGS. 1 and 2, the gate valve device includes a main body 1 made of hard vinyl chloride resin. The main body 1 includes a flow path 9 and a valve chamber 1 extending in a direction perpendicular to the axis of the flow path 9 (in the vertical direction here).
0. Flange portions 4 and 5 are formed around both axial ends of the flow path 9 and the upper end opening of the valve chamber 10, respectively. A lid 8 is fitted onto the flange portion 5 via a spindle receiver 6 and a thrust ring 7, and the lid 8 is fixed to the main body 1 with bolts and nuts.

Reference numeral 2 denotes a valve body to which an elastic cover 11 is fitted and adhered, and its upper end is provided with engagement protrusions 2a, 2a', which engage and slide into the guide groove 1a of the main body 1, and It prevents rotation and only allows vertical movement. The lower part, that is, the tip part of the valve body 2 has a hemispherical shape, and the diameter increases in a tapered shape toward the upper part. The taper is preferably set at an inclination angle of approximately 1/10 to 1/5.

A female threaded portion 2b is formed at the center of the base end, that is, the upper end of the valve body 2, and a hollow portion 2c continuous to the female threaded portion 2b is provided below the female threaded portion 2b. The female threaded portion 2b is screwed into the male threaded portion 3a of the spindle 3 extending into the valve chamber 10. The spindle 3 is rotatably supported by the main body 1 via a spindle receiver 6 so as not to move in the axial direction of the spindle 3. Spindle 3 and spindle receiver 6
and between the spindle receiver 6 and the main body 1 are sealed by seal rings. When a handle 12 fixed to the upper end of the spindle 3 is rotated, the valve body 2 moves forward and backward in the vertical direction.

Eight grooves 2d extending in the vertical direction are formed on the outer peripheral surface of the valve body 2. As shown in Figure 3,
The upper end of the square groove 2d reaches an annular engagement groove 2f provided in the upper part of the valve body 2, and the lower end of each groove 2d reaches the upper end of the hemispherical surface of the valve body 2.

It is preferable to provide 4 or more grooves 2d, especially 6 to 6 grooves.
It is preferable to provide eight strips. When six strips are provided, it is preferable to provide them diametrically opposite each other at intervals of 60° on the circumference. In addition, when eight strips are provided, it is preferable to provide them at intervals of 45° on the circumference. If the number of threads is less than 4, the tight fit between the valve body 2 and the elastic cover 11 described later is insufficient, and the downstream portion of the elastic cover 11 may peel off from the valve body 2, especially when high fluid pressure is applied during valve closure. It becomes easier to do.

The width and depth of the groove 2d are not particularly limited, but the width is about 6 to 10 mm, and the depth is about 2 to 5 mm.
It is best to set it to a certain degree. The depth of the groove 2d does not necessarily have to be uniform, and as shown in FIG.
The depth may be sloped so that it becomes deeper as it goes upward.

A small hole 2e connected to the hollow portion 2c of the valve body 2 is provided at the center of the bottom of the valve body 2. Although the diameter of this small hole is not particularly limited, it is preferably about 4 to 8 mm. A small groove 2g having a circular cross section is provided around the small hole 2e, into which the small annular projection 11c of the elastic cover 11 fits.

Reference numeral 11 denotes a cap-shaped elastic cover made of synthetic rubber or the like, which is fitted onto the valve body 2 and adhered thereto. The lower part of the elastic cover 11 has a hemispherical shape, and the diameter increases in a tapered shape toward the upper part. The elastic cover 11 is closely attached to the outer peripheral surface of the valve body 2 with an adhesive, and is provided so as to be inscribed in the valve seat surface of the main body 1 when the valve is closed.

Referring to FIG. 4, the inner circumferential surface of the elastic cover 11 is integrally molded with eight protrusions 11a that fit into grooves 2d provided on the outer circumferential surface of the valve body 2. . The protruding strip 11a extends in the vertical direction. An annular engagement protrusion 11d that fits into an annular engagement groove 2f provided in the upper part of the valve body 2 is integrally formed on the inner circumferential surface of the upper end of the elastic cover 11. Also, at the center of the bottom of the elastic cover 11, a small hole 11b communicating with the small hole 2e of the valve body 2 is provided.
A small annular projection 11c that fits into the small circular groove 2g of the valve body 2 is formed around the small annular projection 11c. The thickness of the elastic cover is not particularly limited, but is preferably set to about 4 to 6 mm.

In the gate valve device having the above configuration, the spindle 3 which is threadedly connected to the valve body 2 is of an internal thread type, so that it rotates with the rotation of the handle 12 but does not move up and down. Therefore, the valve body 2 is connected to the spindle 3.
As the valve body rotates, the engaging protrusions 2a, 2a' are slidably engaged with the guide grooves 1a in the valve chamber of the main body, thereby moving up and down.

The valve body 2 and the elastic cover 11 are firmly connected by the mutual fitting of the eight grooves 2d and the protrusions 11a, and are bonded together with an adhesive. Therefore,
In particular, even if the valve body 2 receives high fluid pressure when the valve is closed, the elastic cover 11 is prevented from shifting in the circumferential direction. Therefore, the elastic cover 11 is prevented from peeling off from the valve body 2, and the elastic cover 11 is prevented from protruding into the downstream flow path.

In addition, when the valve is opened, solid particles and foreign matter in the fluid accumulated in the hollow part 2c of the valve body and the threaded part (thread groove) between the valve body 2 and the spindle 3 pass through the small holes 2e and 11b and enter the fluid flow path. He ended up running away. That is, since negative pressure is generated in the small hole 2e and the hollow part 2c of the valve body due to the flow of the fluid, most of the solid particles and foreign matter in the fluid accumulated inside the valve body 2 are drawn out into the flow path. Put it away.

Furthermore, when the valve is closed, these small holes 2e and 11b serve as escape ports for solid particles and foreign matter in the fluid that has accumulated in the valve seat of the main body 1, so that foreign matter may be present between the valve body 2 and the flow path surface. Things will disappear.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of a gate valve device showing an embodiment of the present invention, Fig. 2 is a half-sectional side view of the device shown in Fig. 1, and Fig. 3 is a front view of a valve body having eight grooves. 4 are plan views of the elastic cover. 1... Main body, 1a... Guide groove, 2... Valve body,
2a, 2a'...Engagement protrusion, 2b...Female screw part,
2c...Hollow part, 2d...Concave groove, 2e...Small hole,
2f...Annular groove for engagement, 2g...Small groove, 3...Spindle, 3a...Male thread part, 4, 5...Flange part, 6...Spindle receiver, 7...Thrust ring, 8...Lid, 9...Flow path, 10...Valve chamber, 1
1... Elastic body cover, 11a... Convex strip, 11b...
...Small hole, 11c...Small annular projection, 11d...Engaging projection, 12...Handle.

Claims (1)

[Claims for Utility Model Registration] A main body 1 having a flow passage 9 therein and a valve chamber 10 extending perpendicularly to the axis of the flow passage 9;
a spindle 3 that extends inside the main body 1 and is rotatably supported by the main body 1; a valve body 2 whose outer surface at the tip end is approximately spherical; and an elastic cover that is fitted and adhered to the outside of the valve body 2. 11, the valve body 2 has a hollow part 2c opening at its base end, and a female threaded part 2b is formed on the inner surface of the hollow part 2c on the base end side of the valve body 2, and the female threaded part The valve body 2 and the elastic cover 11 are moved into the valve chamber 1 by the rotation of the spindle 3 screwed into the valve body 2b.
The flow path 9 of the main body 1 is opened and closed by moving forward and backward along the inner wall of the valve body 1, and furthermore, the valve body 2 has a groove 4 extending in the direction of movement of the valve body 2 on its outer peripheral surface.
In a gate valve device in which the elastic body cover 11 has a convex groove 11d on its inner circumferential surface that has a concave groove 2d that is larger than a strip, the valve body 2 and the elastic body cover 11 Small holes 2e and 11b, each having a smaller diameter than the inner diameter of the hollow part 2c of the valve body 2 and communicating with each other, are provided at the center position of the tip.
e, 11b enable communication between the valve body 2 and the flow path 9 of the main body 1, and furthermore, the small hole 1 of the elastic cover 11 is formed in the groove 2g formed on the outer peripheral edge of the small hole 2e of the valve body 2.
A gate valve device characterized in that a protrusion 11c formed around 1b is fitted.