JPS5921336Y2 - valve dustproof device - Google Patents

Description

[Detailed description of the invention] The present invention has a screw piece part and a shaft seal part separated from each other,
The present invention relates to a dust prevention device for a valve such as a yoke type valve, in which the valve stem located between the valve stems is exposed to the outside.

Conventionally, for example, a yoke type valve 10 has a valve body 11, as shown in FIG. Valve stem 12, male screw 13, operating/'% handle 1
4. The valve stem 12, which is composed of the shaft seal part 15, the screw piece 18, the yoke 19, etc., and is located between the part where the screw piece 18 is located and the shaft seal part 15 is exposed to the outside, is not dust-proof. It wasn't given much consideration.

For this reason, when the facing valve 10 is installed outdoors, for example, dust mixed in the atmosphere tends to adhere to the valve stem.

Since the valve stem is located near the shaft seal and enters into the interior thereof, it is easy for dust to get stuck therein, and the shaft seal may be damaged at an early stage.

This invention was devised to solve the problems mentioned above, and its purpose is to prevent dust from adhering to the valve stem located between the screw part and the shaft seal part. to provide dustproof equipment.

In the valve dust prevention device of the present invention, the part with the screw piece and the shaft seal part are separated, the valve stem located between them is exposed to the outside, and the seal retainer of the shaft seal part is located at the separated part. In a valve that can be tightened and moved in the axial direction of the valve stem, a dust-proof pipe that can be expanded and contracted in the axial direction of the valve stem is interposed between the screw piece and the packing retainer, and the valve stem at the same location is The feature lies in the fact that it is designed to cover the following.

Since the present invention has such a structure, dust does not adhere to the valve stem located between the screw piece part and the shaft seal part.

As a result, there is no possibility that dust will get caught in the shaft sealing portion and the shaft sealing condition will be damaged at an early stage.

Furthermore, according to the present invention, the dust-proof pipe is made expandable and retractable in the axial direction of the valve stem, so even if the presser body of the sealing holder that constitutes the shaft sealing part is moved, it does not work with the screw piece part. Even if the distance between the shaft seal and the shaft seal changes slightly, it will reliably follow the change, ensuring a perfect seal at all times and preventing deterioration of the dustproof effect.

However, according to the present invention, due to the extremely simple structure, an accurate dustproof effect can be expected, and the valve can fulfill its original function.

The details of the embodiment will be explained below based on the drawings showing the embodiment.

An example of a valve 10 suitable for employing the dust prevention device 1 is a yoke type valve as shown in FIG.

Normally, as shown in the figure, the valve box 11 includes at least a valve body 11, a valve body (not shown) that operates to open and close the valve inside the body, and a valve stem 12 that operates the valve body. , a male screw 13 is carved on the outside of the valve body of the valve stem 12,
An operating bundle 14 is attached to the head.

A shaft sealing portion 15 is provided in the upper part of the valve body 11 for the penetrating valve stem 13, and this is cut out from a sealing material 16 such as a gland packing and a packing retainer 17, as shown in the drawing. In the embodiment, the seal presser 17 is pressed by a presser body 17a.
The case where the cylinder body 17b is divided into two parts is illustrated.

Of course, these may be integrated.

A yoke 19 for supporting the screw piece 18 is provided at the upper part of the valve body 11, and a screw hole 20 is formed at the base of the yoke 19, which is screwed into the male screw 21 of the valve body 11. and are fastened with a lock nut 22.

On the other hand, a screw piece 18 is attached to the head of the yoke 19,
In the drawing, matching screws 23 and 24 are cut into both, respectively, and rotation is prevented by a knock pin 25.

Further, another screw hole 26 is drilled at the base of the yoke 19, into which an embedded bolt 27 is screwed and established, and inserted into a through hole 28 drilled in the pusher body 17a of the packing holder 17 to tighten the nut. Tighten at 29.

In FIG. 1, an opening display scale plate 30 is attached to the head of the yoke 19 with screws 31, etc., and a pointer disk 32 is attached to the male screw 13 of the valve stem 12 at the appropriate position. lock screw 33
It is fixed at.

In such a valve 10, as shown in FIG. 1, the space between the screw piece 18 and the pusher body 17a of the seal holder 17 is open to the outside, and the valve stem 12 located at that location is exposed. There is.

Further, the pusher body 17a of the seal presser foot 17 is moved up and down by tightening the nut 29, and the distance between the screw piece 18 and the pusher body 17a is variable.

The dustproof device 1 is employed in the valve 10 as described above, and has a dustproof pipe 2 interposed between the screw piece 18 and the seal holder 17 to cover the valve stem 12 in this area.

Since the interval between the dustproof pipes 2 is variable as described above, it is desirable that the interval can be expanded and contracted in the longitudinal direction, that is, in the axial direction of the valve stem 12.

In the first embodiment shown in FIGS. 1 and 2, the dustproof pipe 2 includes a single pipe 2a and a cylindrical guide protrusion 2b into which one end of the pipe 2a is slidably fitted. The upper end of the pipe 2a is fixed to a screw piece 18, which is one member, and the guide protrusion 2b is provided on a pusher body 17a of a seal holder 17, which is another member.

In this embodiment, the cylindrical guide protrusion 2b is made into a separate pipe, and this is attached to the pusher body 17a.

The pipe 2a is made of Teflon, and the other pipe 2b is made of other metal such as SUS.
A latching recess 2a' is formed on the inside of the upper part of the screw piece 18, and a latching protrusion 18' that fits the screw piece 18 is formed on the lower part of the screw piece 18, so that the two can be fixed with one touch by pushing in the longitudinal direction. is being done.

The locking recess 2a' and the locking protrusion 18' can also be provided to be reversed.

On the other hand, the lower end of one pipe 2b is press-fitted into a receiving hole 17a' formed in the pusher 17a.

The pipe 2b can also be used in the form of a plate or a cylinder, and the materials of the pipes 2a and 2b are not limited to those mentioned above.

In addition, in FIGS. 1 and 2, a separate pipe is fixed to the pusher 17a as the guide protrusion 2b, but the pusher 17a
7a itself can also be provided with this guide protrusion 2b.

A second embodiment shown in FIG. 3 is a guide in which at least one end of a single pipe 2C is fixed to an adjacent member, and the other end of the pipe 2C is slidably fitted into the other member. This is a case where a structure is provided with a hole 2d.

In the same figure, a Teflon pipe is used as in the first embodiment, and there is a hook recess 2c' between the two so that the upper end of the pipe can be fixed to one member, the screw piece 18, with a single touch. A stop protrusion 18' is provided, and the guide hole 2d is provided in the pusher body 17H, which is the other member, as an example.

Figure 4 shows a third embodiment, which has elasticity (elasticity).
A single pipe 2e made of a certain material is simply fitted with a valve cap between a screw piece 18 and a pusher 173.

Of course, it is also possible to fix at least one of the upper and lower ends to an adjacent member, and care may be taken to prevent the pipe 2e from coming into contact with the valve stem 12.

In the fourth embodiment shown in FIG. 5, for example, a rigid pipe 2f formed into a bellows shape and having elasticity in the longitudinal direction due to the so-called shape is interposed at the same location. Similar to the third embodiment, various considerations can be made.

With such a configuration, the portion of the valve stem 12 located between the screw piece and the pusher body 17a of the backing presser foot 17 is covered,
This prevents dust from adhering to the same area.

Therefore, there is no risk that the seal material 16 in the shaft seal portion 15 will get caught and cause wear and damage.

However, since the dust-proof pipe 2 is made to be able to expand and contract in the axial direction of the valve stem 12, or has such a structure, even if the pusher body 17a of the seal retainer 17 is moved, it will not clog. Even if the spacing changes slightly, it reliably follows the gap, ensuring a completely sealed state at all times, and preventing deterioration of the dustproof effect.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view when the dust prevention device according to the first embodiment is applied to a yoke type valve, Fig. 2 is an enlarged longitudinal sectional view of the main part according to the first embodiment, and Fig. 3 is a longitudinal sectional view of the main part according to the first embodiment. FIG. 4 is a similar view showing a third embodiment, FIG. 5 is a similar view showing a fourth embodiment, and FIG. 6 is a longitudinal sectional front view showing a conventional yoke type valve. It is. 1 is a dustproof device, 2 is a dustproof pipe, 10 is a valve, 12 is a valve stem, 15 is a shaft sealing portion, 17 is a packing holder, and 18 is a screw piece.

Claims (1)

[Claims for Utility Model Registration] 1. The part where the screw piece 18 is located and the shaft sealing part 15 are spaced apart, and the valve stem 12 located between them is exposed to the outside, and the shaft sealing part 15 is located at the spaced apart part. In a valve in which a packing holder 17 is located and can be tightened and moved in the axial direction of the valve stem 12, a dust-proof pipe that is extendable and retractable in the axial direction of the valve stem 12 is provided between the screw piece 18 and the packing holder 17. A dustproof device for a valve, characterized in that a valve stem 12 is interposed therebetween, and the valve stem 12 at the same location is covered by the valve stem 12. 2. The dustproof pipe 2 is composed of a single pipe 2a and a cylindrical guide protrusion 2b into which one end of the pipe is slidably fitted,
The other end of the pipe 2a is fixed to one member adjacent to the pipe 2a, and the guide protrusion 2b is provided on the other member to have elasticity in the longitudinal direction. Claim 1 Dust-proofing device for the valve described in section. 3. The dustproof pipe 2 is composed of a single pipe 2C and a guide hole 2d into which one end of the pipe 2C is slidably fitted, and the other end of the pipe 2C is fixed to one member adjacent to the pipe 2C, The dust-proof device for a valve according to claim 1, wherein the guide hole 2d is provided in the other member to have elasticity in the longitudinal direction. 4. The dustproof device for a valve according to claim 1, wherein the dustproof pipe 2 is constructed of a single pipe 2e made of a material that is stretchable in the longitudinal direction. 5. The dust-proof device for a valve according to claim 1, wherein the dust-proof pipe 2 is constituted by a single pipe 2f that is stretchable in the longitudinal direction depending on its shape.