JPH0738825U - Gate valve - Google Patents

Abstract

(57) [Summary] [Purpose] When the valve is closed, it is possible to reduce the amount of powder and granules caught in the valve, and to open and close the valve smoothly. [Structure] By providing a cutout portion 15 that is curved in an arc shape in a direction opposite to the lower half portion of the valve hole 12 at the lower edge of the valve body 14, the valve body 12 and the valve edge of the valve hole 12 are closed until just before fully closing. The crossing angle α with the lower edge of the body 14 can be kept significantly higher than in conventional valves, so that the particles at the crossing are pushed forward and backward as the valve closes, sandwiching between them. The valve can be opened and closed smoothly without being entrapped. If the V notches 13 and 16 are provided on at least one of the lower edge of the valve hole 12 and the upper portion of the upward arcuate notch 15 provided on the lower edge of the valve body 14, the above-mentioned intersection angle α
Does not have a small angle until the end, which makes it possible to open and close the valve more smoothly.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gate valve suitable for controlling the flow of powder and granules.

[0002]

[Prior art]

 3 to 5 schematically show a conventional gate valve provided at a key part of a pipe (not shown) for conveying powder particles, (1) is a valve box, (2) is a valve box (1 A circular valve hole formed in () facing in the front-rear direction, (3) has a plate shape, and a lower end edge has a semicircular shape slightly larger than the valve hole (2) and projects downward ( Reference numeral 4) is a valve shaft that is a screw rod that is continuously provided upward at the center of the upper end of the valve body 3, and reference numeral 5 is a handle that is screwed to the valve shaft 4 and that cannot be moved up and down.

The valve body (3) is moved up and down together with the valve shaft (4) by rotating the handle (5) in both directions to open and close the valve hole (2).

[0004]

[Problems to be solved by the device]

 However, the conventional gate valve as described above can be used without any problem in controlling the flow of liquid, but when it is used in the flow path of the granular material (6), the lower end of the valve element (3) has a valve hole ( Since it is curved in the same direction as the lower part of 2), as shown in Fig. 3, when the valve is closed, the crossing angle α between the lower edges of the valve hole (2) and the valve body (3) is extremely large. If the angle becomes small, the particles (6a) in the conveyed product may be caught during this, which may make the opening and closing of the valve unsuccessful or the valve may become inoperable.

In view of the above-mentioned problems of the conventional technology, the present invention provides a gate valve that can be smoothly opened and closed by reducing the trapping of powder particles when the valve is closed. It is intended to be provided.

[0006]

Means for Solving the Problems In order to achieve the above object, the present invention provides a valve hole by moving a plate-shaped valve element up and down with respect to a circular valve hole provided in a valve box and oriented in the front-rear direction. In the gate valve configured to open and close the valve, an arcuate notch that is recessed upward is provided at a partition end of the lower edge of the valve body.

A V notch may be provided in at least one of the lower edge of the valve hole and the upper portion of the arcuate cutout portion of the valve body.

[0008]

[Action]

 The valve of the present invention is provided with an arcuately curved notch portion in the lower edge of the valve body which faces in the direction opposite to the lower half portion of the valve hole. The intersection angle α with the lower edge can be kept significantly larger than that of the conventional valve, and therefore the particles at the intersection are extruded in the anteroposterior direction as the valve closes, sandwiching between them. The valve can be opened and closed smoothly without being trapped.

If a V notch is provided in at least one of the lower edge of the valve hole and the upper portion of the upward arcuate notch formed in the lower edge of the valve body, the above intersection angle α will be the last. The valve can be opened and closed more smoothly without becoming a small angle. Further, the granules caught in the V notches are easily crushed by the V notches.

[0010]

【Example】

 1 and 2 show an embodiment of the present invention, in which the valve box (11) corresponding to the above (1) has a valve hole (12) corresponding to the above (2) at the center of the lower edge thereof. A first V notch (13) which is recessed downward in a V shape is cut out.

At the partition edge of the lower edge of the plate-shaped valve body (14) corresponding to the above (3), a cut-out recessed upward in a semi-circular shape having a diameter substantially equal to that of the valve hole (12). The notch (15) is cut, and a plurality of second V notches (16) recessed upward in an inverted V shape are provided in a sawtooth shape at the center of the upper edge of the notch (15). Has been.

Therefore, as shown in FIG. 1, in this valve, the intersection angle α between the lower edges of the valve hole (12) and the valve body (14) is significantly larger than that of the conventional valve, and the grain at the intersection is large. The body (6a) is not gradually pushed back and forth as the valve is closed and is not caught.

Immediately before the valve is closed, the center of the lower edge of the substantially horizontal valve hole (12) and the upper center of the notch (15) are close to each other, but the intersecting local part is the valve hole (12). The arcuate edge and the first V notch (13) and the second V notch (16) of the valve body (14) become the intersection angle α of the actual intersecting local area. As a result, the particles (6a) at the intersection are extruded as the valve is closed as described above.

At this time, some of the particles (6a) are caught in both V notches (13) and (16), but the amount is small and the crossing angle α is large, so that the particles are easily crushed. The valve is always opened and closed smoothly.

The number of both V notches (13) and (16) is not limited to the number shown in the figure, and may be set as appropriate according to the size of the valve and the properties of the granular material (6) to be handled, and either one of them. One or both may be omitted and implemented.

[0016]

[Effect of device]

 (a) The gate valve of the present invention is a gate valve that opens and closes a valve hole by moving a plate-shaped valve body up and down with respect to a circular valve hole that is provided in a valve box and faces the front-back direction. Since an arcuate notch that is recessed upward is provided at the partition edge of the lower edge of the valve element, the lower edge of the valve hole and the lower edge of the valve element are not closed until the valve is fully closed. Since the crossing angle α can always be maintained at a large value, there is less risk of fluid being caught between them when the valve is closed, and it is possible to smoothly open and close the valve by reducing the resistance force when closing. it can.

(B) If a V notch is provided in at least one of the lower edge of the valve hole and the upper portion of the upward arcuate notch provided in the lower edge of the valve body, the above intersection angle α does not become a small angle until the end, which makes it possible to open and close the valve more smoothly. Further, the granules caught in the V notches are easily crushed by the V notches.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional front view of the central part of a gate valve of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a central longitudinal front view of a main part of a conventional gate valve.

4 is a sectional view taken along line BB of FIG.

FIG. 5 is a front view of a conventional gate valve.

[Explanation of symbols]

 (1) Valve box (2) Valve hole (3) Valve body (4) Valve shaft (5) Handle (6) Granule (6a) Granule (11) Valve box (12) Valve hole (13) First V Notch (14) Disc (15) Notch (16) Second V notch (α) Crossing angle

Claims (3)

[Scope of utility model registration request] 1. A gate valve which opens and closes a valve hole by moving a plate-shaped valve element up and down with respect to a circular valve hole which is provided in a valve box and faces the front-rear direction. A gate valve characterized in that an arcuate notch that is recessed upward is provided at a partition end of the edge. 2. The gate valve according to claim 1, wherein a V notch that is recessed upward in an inverted V shape is provided on an upper portion of the arc-shaped notch. 3. The gate valve according to claim 1, wherein the lower edge of the valve hole is provided with a V notch recessed downward in a V shape.