JPS5814287Y2 - slide valve - Google Patents

Description

[Detailed description of the invention] This invention provides two linear guides that are parallel to each other at the left and right positions of the valve body with respect to the valve body, and these guides separately hold the left and right parts of the valve body in a slidable manner. and an operating shaft having an axis parallel to both guides and slidably held in the axial direction with respect to the valve box, and the valve body,
The present invention relates to a slide valve that is engaged and connected by a retaining portion, which is a connecting member fixed to one side of both, and an engagement piece, which is a connecting member fixed to the other side.

Conventionally, this type of slide valve was Publication No. 38-2372 (See Figures 7 and 6) What is disclosed in is publicly known.

In this known device, a valve body 4 that is slidable in the direction of the axial force of an operating shaft 6' is provided in a valve body body 1, and is pushed into a hole of an engaging portion 7' provided at one end of the valve body 4. An engaging piece 8' having both engagement points when pulled is disposed, and this engaging piece 8' is connected to the operating shaft 6', which is provided within the valve box body so as to be able to reciprocate in the axial direction of the operating shaft 6'. are integrally combined.

Conventionally, when the valve body is tilted from a predetermined posture with respect to a plane including the entire sealing surface of the valve seat, the axis of the operating shaft 6' may be tilted with respect to the center line of the valve body engaging portion 7'.

For this purpose, the elliptical engagement piece 8' of the operating shaft is engaged in the hole of the retaining portion 7' of the valve body 4, and the operating shaft 6' and the valve body 4 are connected through a kind of universal joint. are doing.

This device has a problem in that the operating resistance of the valve increases during long-term use, making it difficult to operate.

The reason for this is that because the engagement surfaces of the hole in the engagement piece 8' and the valve body engagement part 7' contact, the engagement surface of the hole in the engagement piece and the valve body engagement part wears unevenly at the contact part. , and the contact point changes during the opening/closing operation of the valve body.

Therefore, due to this uneven wear, the operating force from the operating shaft acts on the valve body as an uneven load during operation, and this uneven load acts on the valve body as a prying force, and as the uneven wear increases, this This is because the prying force increases.

The technical problem to be solved by the present invention is to eliminate the uneven wear caused by the abrasion of the abutting surfaces of the engaging piece and the hole of the valve body engaging portion, and to prevent the valve body from being twisted.

The technical measures taken to solve the above technical problems are:
The engaging surfaces of the engaging piece and the engaging portion are both spherical surfaces centered on the center point of the valve body.

The above technical means works as follows.

In other words, since the engagement surfaces of the engagement piece and the engagement portion are both spherical surfaces of the same shape centered on the center point of the valve body, the entire surface of the contact surfaces abuts, and this contact relationship is controlled by the valve body. It does not change even if the axial direction is tilted with respect to the shaft, or even if the valve body unexpectedly rotates in the circumferential direction.

(See FIG. 5) Therefore, wear during use progresses almost uniformly over the entire surface of the abutting sphere, and uneven wear does not occur on the abutting surface.

Moreover, the present invention produces the following unique effects.

Since the contact surface between the valve body and the engagement piece is almost the entire spherical surface, there is little wear on the contact surface, and the durability against mechanical damage of the connection portion of this slide valve is improved, allowing smooth sliding over a long period of time. can.

Further, even if dust is present in the guide, the valve body can be operated with a strong operating force against the presence of dust.

Next, an example showing a specific example of the technical means of the present invention will be described.

A lid 2 is attached to a valve box 1 provided with a flange for piping connection, and the valve moves in and out of the valve box flow path in a direction perpendicular to the center line of the flow path of the valve box 1 and along guides 3. body 4
and the operating shaft 6 passing through the bearing structure 5 provided at the end of the lid 2 are connected to the retaining portion γ, which is a connecting member fixed to the valve body 4, and the engaging member, which is a connecting member fixed to the operating shaft 6. A slide valve is constructed by engaging and connecting with a piece 8 and connecting a drive mechanism 9 for sliding the slide valve element to the operating shaft 6.

By moving the operating shaft 6 in the axial direction, the surfaces on which the engaging portion 7 and the engaging piece 8 come into contact with each other by pushing and pulling are set as follows.

That is, the surface a that comes into contact during the pushing operation when closing the valve body 4
, a, and the faces and b that come into contact during the pulling operation when opening the valve body 4 are each set to be a spherical surface centered on the intersection point P of the valve body center axis perpendicular to the valve body surface and the axis of the operating shaft 6. It is.

FIG. 4 shows another embodiment of the connection structure, in which the engaging portion T is connected to the operating shaft 6, and the engaging piece 8 is connected to the valve body 4.

[Brief explanation of the drawing]

The drawings in FIGS. 1 to 5 show an embodiment of the slide valve according to the present invention, and FIG. 1 is a partially cutaway front view of the slide valve;
Fig. 2 is a detailed view of the main parts of a horizontal or vertical slide valve, Fig. 3 is a central vertical sectional side view, Fig. 4 is a detailed view of the main parts of another embodiment, and Fig. 5 is a main part of the main part of the slide valve. FIG. 6 is a cutaway front view of a conventional slide valve, and FIG. 7 is an explanatory diagram of the main part of the invention. 4...Slide valve body, 6...Operation shaft, γ
...Engagement portion, 8...Engagement piece, a, b.
...Engagement surface.

Claims (1)

[Scope of utility model registration request] Linear guides 3, 3 which are parallel to each other are provided on the left and right positions of the valve body 1 with respect to the valve body 4, and the valve body 4 is attached to the guides 3°3.
an operating shaft 6 which has an axis parallel to the guides 3, 3 and is slidably held relative to the valve box 1 in the axial direction; The slide valve is a slide valve in which the valve body 4 is engaged and connected by an engaging portion 1, which is a fixed connecting member, on one side of the two, and an engaging piece 8, which is a fixed connecting member, on the other side, and A slide valve in which the engaging surfaces of the engaging piece 8 and the retaining portion 7 are both spherical surfaces centered on the center point of the valve body 4.