JPH0443646Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a valve device, and particularly to a valve device for controlling the flow of powder or granular material.

[Prior Art] When granular materials such as coal, sand, ash, shell material, etc. are transported through a pipe, a valve device is used in the pipe to intermittent the flow of the granular material or to adjust its flow rate. It will be necessary to do so.

A device for controlling the flow of powder and granular material is a valve housing having an inlet and an outlet for powder and granular material, and a valve housing having an inlet and an outlet for the powder and granular material, and a valve housing that is in contact with the opening edge of the inlet on the downstream side in the flow direction of the powder and granular material. BACKGROUND OF THE INVENTION Valve devices are known that include a valve body that moves to open and close an inlet. (For example, Japanese Patent Application Laid-open No. 55-109856, Japanese Patent Publication No. 57-501575.) In such a valve device, when closing the inlet with powder inside the valve device, the valve The front edge of the valve body, that is, the leading edge of the portion of the edge of the valve body that crosses the inlet when the inlet is closed moves forward as if scraping through the powder and granules throughout the valve body closing operation. Further, when the valve body finishes closing the inlet, powder particles (particularly large particles) are caught between the leading edge and the edge of the inlet, and the caught particles are sheared.

[Problems to be solved by the invention] A valve in which a conventional valve housing having an inlet and an outlet is provided with a valve body that slides into contact with the opening edge of the inlet on the downstream side in the flow direction of the powder or granular material. In the device, the leading edge of the valve body is linear or gently curved, and a relatively large force is required for this leading edge to move through the powder during the valve closing operation.
Furthermore, a considerable amount of force is required to shear the particulate material caught between the leading edge and the inlet edge.

For this reason, in conventional valve devices, the movement during valve opening/closing is generally heavy, making it difficult to close the valve, or requiring a large rotational torque to drive the valve opening/closing, requiring the installation of a large-capacity drive device. , and other problems arose.

[Means for Solving the Problems] The present invention is a valve device for controlling the flow of powder and granular material, and includes a valve housing having an inlet and an outlet for the powder and granular material, and a valve housing that controls the flow direction of the powder and granular material. In a valve device having an inlet opening/closing valve body that advances and retreats in intersecting directions and slides into contact with the opening edge of the inlet on the downstream side in the powder flow direction, the inner surface of the valve housing portion around the opening edge has an arc shape that becomes wider toward the downstream side in the flow direction of the powder and granule, and the valve body rotates around a rotation axis located on the downstream side of the opening edge in the flow direction of the powder and granule. It is freely provided, has an arc shape with a thickness decreasing from the central part in the advancing and retracting direction toward the leading edge in the advancing and retracting direction, and has a surface that slides into contact with the opening edge of the valve body. The radius of curvature in the direction of movement of the valve body is smaller than the radius of curvature of the inner surface of the valve housing portion around the opening edge in the direction of movement of the valve body, and A plurality of V-shaped concave and convex portions, which are shaped by cutting through the valve body in the thickness direction, are provided on the tip edge of the portion that sometimes crosses the inlet.

[Function] By making the valve body thinner toward the front edge, the valve body can easily move forward through the granular material. In addition, the plurality of V-shaped uneven parts formed on the front edge of the valve body allows the valve body to move smoothly through the powder and granules, thereby reducing the resistance when the valve moves forward. .

In addition, due to this scraping action, the powder that hits the leading edge of the valve body easily moves and separates from the leading edge, so that the powder that is caught between the leading edge of the valve body and the inlet edge is removed. The number becomes smaller.

Furthermore, even if particles are caught between the plurality of V-shaped valleys of this uneven part, the particles are pressed from the left and right sides and pressed against the inlet edge.
An extremely large force begins to act on the particles.
(Since the force in the direction of movement of the valve body is divided in a direction perpendicular to the diagonal direction of the V-shape, an extremely large force acts on the trapped particles.) Therefore,
Even with the same valve operating force, the shearing force applied to the particles becomes much greater and shearing becomes easier. Moreover, for this purpose, the leading edge of the valve body smoothly enters the downstream edge of the inlet.

In the present invention, the valve body and the inner surface of the valve housing are curved so that the valve body slides only on the edge of the inlet. Therefore, the sliding resistance between the valve housing and the valve body is small. Furthermore, the powder interposed between the valve body and the inner surface of the valve housing is crushed between the valve body and the inner surface of the valve housing when the valve body moves forward in the inlet closing direction. , the valve body moves forward smoothly.

In this manner, according to the valve device of the present invention, the movement of the valve body during the valve closing operation becomes extremely smooth, and the force required for the closing operation is also small.

[Example] Hereinafter, an example will be described with reference to the drawings.

1 and 2 are cross-sectional views of a valve device according to an embodiment of the present invention, and FIG. 2 is a -
A cross section along the line is shown. 3 is a perspective view of the valve body, and FIG. 4 is a cross-sectional view taken along the line - in FIG. 3.

First, the overall configuration of a valve device according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

In FIGS. 1 and 2, 10 indicates a valve device, the upper part of which is connected to a hopper 12 for supplying powder and granules, and the lower part thereof to which a pipe 14 for transporting powder and granules is connected. has been done. The valve device 10 mainly includes a valve housing 16 and a valve body 18 installed within the valve housing 16.

The valve housing 16 has a hemispherical dome shape, and has a powder inlet 2 at its top.
4 have been established. Also, the valve housing 16
The lower opening is used as an outlet 26. Inlet 2
A short cylindrical connecting portion 28 is integrally provided at the portion 4 so as to extend upward, and a flange 28f is formed at the upper end of the connecting portion 28. And the hopper 1
The flange 12f provided on 2 and this flange 2
8f are connected by bolts 20 and nuts 22, whereby the hopper 12 is attached to the valve housing 16. Further, a flange 16f is formed at the lower end of the valve housing 16, and a flange 14f is formed at the upper end of the pipe 14, and these are connected by bolts and nuts, thereby solidifying the pipe 14 and the valve device 10. has been done.

Therefore, a stepped portion 30 protruding inward is formed at the opening periphery of the inlet 24, and the inlet 24
A crusher ring 32 and a retainer 34 having an outer diameter slightly smaller than the inner diameter of 4 are arranged to be inserted into the cylindrical connecting portion 28.
The upper surface of the stepped portion 30 and the lower surface of the flange 12f of the hopper 12 hold the crusher ring 32 and retainer 34. The crusher ring 32 is a hard annular member made of metal with high wear resistance, and suppresses wear caused by sliding with the valve body 18. Further, the inner peripheral side of the lower surface of the crusher ring 32 is curved into a spherical shape so as to slide smoothly on the upper surface of the valve body 18.

Next, the structure of the valve body 18 will be explained.

This valve body 18 has a curved portion 3 having a spherical shell shape that matches the lower curved portion of the crusher ring 32.
6, and leg portions 38 and 39 integrally provided at the lower part of this curved portion 36. Legs 38, 3
9, as shown in FIG.
0 and 42 are connected, and these rotating shafts 4
0 and 42 are inserted into support housings 44 and 46 provided in the valve housing 16, and are pivotally supported via bearings 48 and 50. Note 5
Numerals 2 and 54 are sealing members installed on the inner side of the valve housing than the bearings 48 and 50 to prevent leakage of pressurized gas in the valve device 10 or entry of powder into the bearings 48 and 50. Preventing. The axes of the rotating shafts 40 and 42 are arranged on a straight line, and this straight line (axis center line) passes through the center of the spherical surface formed by the lower curved portion of the crusher ring 32 and the upper surface of the valve body 18. .
Therefore, by rotating the rotating shafts 40 and 42, the valve body 18 can be rotated in contact with the lower curved portion of the crusher ring 32.

Further, a motor 58 is attached to the outside of the support housing 46 provided in the valve housing 16 via a motor mounting housing 56, and the outer tip of the rotating shaft 42 is connected to the output shaft of the motor 58. 58 drives the valve body 1.
8 is configured to rotate.

As shown in FIGS. 3 and 4, the curved portion 36 of the valve body 18 has a plurality of uneven portions 60 formed on its front and rear edges. In this embodiment, the plurality of uneven portions 60 are formed by providing a plurality of V-shaped cuts in the front and rear edges of the valve body 18 in the thickness direction.

In the valve device according to the embodiment configured as described above, by driving the motor 58, the valve body 18 is rotated, and the inlet port 24 is opened and closed. (In Figure 1, the valve body 18 is in the middle of rotation.
It is shown in a so-called half-open state. ) When the valve body 18 rotates, the plurality of concave and convex portions 60 have the effect of pushing the powder aside, as explained in the section of the above function. Further, the front edge of the valve body 18 is connected to the inlet port 24.
When it overlaps the edge of the crusher ring 32, it reduces the number of particles that are caught between the two, and if particles are caught, it applies a strong shearing force to them. Shears easily.

In the above embodiment, the valve body 18 can be rotated in either direction by the forward and reverse rotation of the motor 28, so that the uneven portions are formed on the valve body 18 as shown in FIG.
However, if the motor 58 is provided to rotate only in one direction, the uneven portion 60 may be provided only on the front edge on the leading end side in the rotation direction.

In the above embodiment, as shown in the figure, the uneven portions are formed by cutting a plurality of V-shaped protrusions from the front edge of the valve body, but conversely, a plurality of V-shaped protrusions are made to protrude from the front edge. In some cases, uneven portions may be provided. Of course, the uneven portion may be provided by alternately forming a plurality of small V-shaped concave portions and convex portions on the front edge.

Note that the tip of the V-shaped convex portion or the valley portion of the concave portion does not necessarily have to be sharp, and may be slightly rounded.

In the present invention, if the number of uneven portions installed is too small, it will be difficult to achieve the various effects described above, so at least two uneven portions are provided on one side of the valve body.
Provide at least one.

Since the above-mentioned embodiment shows a preferred example of the present invention, the present invention is not limited to what is shown in the drawings. Various technical means such as the above may be added. Further, as the valve body, in addition to a ball shell shape, a half cylinder shape or the like may also be used.

[Function] As detailed above, in the valve device of the present invention, the valve body is thinner toward the leading edge, and an uneven edge is formed on the leading edge of the valve body, and the valve body and valve housing are required. Since it is curved, it can be opened and closed smoothly with a small amount of operating force. That is, since the leading edge of the valve body is thin, the valve body moves forward and backward while pushing through the powder. Further, the V-shaped uneven portion on the front edge of the valve body easily crushes the powder sandwiched between the valve body and the inlet edge. Further, the powder interposed between the valve body and the valve housing is crushed between the valve body and the inner surface of the valve housing when the valve body moves forward in the inlet closing direction.
The synergy of these effects ensures that the valve body can be opened and closed easily and smoothly.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views of a valve device according to an embodiment of the present invention, and FIG. 2 is a -
A cross section along the line is shown. 3 is a perspective view of the valve body 18, and FIG. 4 is a cross-sectional view taken along the line - in FIG. 10...Valve device, 12...Hopper, 14...
...Piping, 16...Valve housing, 18...Valve body, 20...Dome part, 24...Inflow port, 26...
... Outlet, 36... Curved portion, 38, 39... Leg, 40, 42... Rotating shaft, 44, 46... Support housing, 48, 50... Bearing, 58...
...Motor, 60...Uneven part.

Claims (1)

[Claims for Utility Model Registration] A valve device for controlling the flow of powder or granular material,
A valve housing having an inlet and an outlet for powder and granular material, and an inlet for opening and closing that advances and retreats in a direction intersecting the flow direction of powder and granular material and slides into contact with the opening edge of the inlet on the downstream side in the flow direction of powder and granular material. In a valve device having a valve body, the inner surface of the valve housing portion around the opening edge has an arc shape that becomes wider toward the downstream outer side in the flow direction of the powder, and the valve body has: It is rotatably provided around a rotation axis located downstream of the opening edge in the direction of flow of the powder and granules, and the thickness decreases from the center in the advancing/retracting direction toward the tip edge in the advancing/retracting direction. The radius of curvature of the surface of the valve body in sliding contact with the opening edge in the valve body advancing and retracting direction is equal to the curvature of the inner surface of the valve housing portion around the opening edge in the valve body advancing and retracting direction. The radius of the valve body is smaller than the radius of the valve body, and a plurality of V-shapes formed by cutting through the valve body in the thickness direction are provided at the tip edge of the portion of the edge of the valve body that crosses the inlet when the inlet is closed. A valve device that is provided with uneven parts.