JPS61228168A - Valve for powdery material-contained gas - Google Patents

Abstract

PURPOSE:To prevent a conveying powdery material from being lodged between a valve body and a lower valve seat, by a method wherein an angle of a line, connecting the inner edge of a slide contact part between each of upper and lower valve seats and a valve body, with a horizontal line is decreased over the angle of repose of the powdery material. CONSTITUTION:Upper and lower valve seats 4 and 6 are disposed so that an angle alpha of a line l, connecting inner edges 4a and 6a of a slide contact part between a valve body 9 and each of the upper and lower valve seats 4 and 6, with a horizontal line is decreased over the angle of repose of a powdery material. Even the powdery material, which is brought into contact with the inner edge 4a of the upper valve seat 4 and dropped for conveyance under a stae in that the valve body 9 is opened, is prevented from making contact with the inner edge 6a of the lower valve seat 6 and being dropped. This, when a flow passage F is closed, prevents a conveying powdery material from being lodged between the valve body 9 and the lower valve seat 6.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a valve used to interrupt the transportation of powder-containing gas when transporting gas containing powder such as coal or sand. More specifically, a valve body for opening and closing the flow path in the valve box extending vertically downward is provided so as to be slidable approximately horizontally, and the upper and lower surfaces of the valve body The present invention relates to a powder-containing gas valve having an upper valve seat and a lower valve seat that are in sliding contact with each other.

[Conventional technology]

Conventionally, in this type of valve, as shown in FIG. Both valve seats (4) and (6') were constructed to have openings of approximately the same diameter.

In other words, the valve bodies (9) of both valve seats (4) and (6')
), the inner edge of the sliding contact part (4a), (6a'
) was constructed so that the angle (α″) formed by the line connecting the two points (1″) and the horizontal line was almost a right angle (for example,
-Application No. 155404).

[Problem that the invention seeks to solve]

Therefore, with the conventional structure, when the valve body (9) is opened and the powder-containing gas is transported along the vertically downward flow path (F), the powder is transferred to the lower valve seat (6゛). Inner edge (6a'
) was in contact with the In this state, the valve body (9) is slid to close, so the transported powder gets caught between the valve body (9) and the lower valve seat (6a'), which causes In the worst case, if the gas in the flow path (F) leaks from between the valve body (9) and the lower valve seat (6a''), or if the operation of opening and closing the valve body (9) becomes difficult, There was a drawback that it became inoperable.

Furthermore, if the transported powder is hard, the lower surface of the valve body (9) and the upper ml of the lower valve seat (6a'') may be damaged due to the powder getting stuck, resulting in gas leakage. Sometimes it happened.

The present invention focuses on such conventional drawbacks, and effectively utilizes the characteristics of transported powder to ensure that transported powder is not caught between the valve body and the lower valve seat. The purpose of the present invention is to provide a valve for powder-containing gas that can prevent the above.

[Means for solving problems]

In order to achieve this object, the valve for powder-containing gas according to the present invention has an angle between a horizontal line and a line connecting the inner edges of the sliding portions of the upper and lower valve seats that contact the valve body. The valve seat is characterized in that both the valve seats are arranged so as to be smaller than a corner.

[For production]

Therefore, when the valve body is opened to transport powder-containing gas, it is natural that the powder is transported near the center of the flow path, and the powder that comes into contact with the inner edge of the upper valve seat and is transported falling. The valve does not come into contact with the inner edge of the lower valve seat, and therefore, when the valve element is slid to close, there is no possibility that transported powder may get caught between the valve element and the lower valve seat. There is no.

〔Effect of the invention〕

As mentioned above, since it prevents transported powder from getting caught between the valve body and the lower valve seat, it is certain that there will be no opening/closing operation or gas leaks caused by powder getting caught. This allows for many years of good operation.

〔Example〕

An embodiment of the present invention will be described based on the drawings. An upper valve box (1a) and a lower valve box (1b) made of cast metal and forming a flow path (F) with a circular cross section facing vertically downward are the same. They are arranged one above the other in the shape of a core, and a cylindrical body 2) is fitted into the lower part of the upper valve box (1a) via a seal member (3) so as to communicate with the flow path (F). An annular upper valve seat (4) made of stainless steel coated with stellite or tungsten carbide is located below the cylinder (2), and an intervening body is placed between the valve seat (4) and the cylinder (2). mounted disc spring (5
), the valve seat (4) is elastically biased downward. On the other hand, at the upper part of the lower valve box (1b), there is a lower valve seat (6) made of ceramics and having a tapered passage with a downward convexity.
is fitted through a sealing member (7) in a state where it communicates with the flow path (F), and this lower valve seat (6) and the upper valve seat (4)
A ceramic valve body (9) having a through hole (8) substantially aligned with the passage of the upper valve seat (4) is slidably provided between the upper valve seat (4) and the upper valve seat (4).

Then, the diameter of the inner edge (4a) of the upper valve seat (4) portion that comes into sliding contact with the valve body (9) is (d), and the diameter of the inner edge (4a) of the lower valve seat (6) is (d).
When the diameter of the inner edge (6a) of the part is (D), the wall thickness of the valve body (9) is (1), and the angle of repose of the powder transported in the flow path (F) is (θ). , p > 2t/1anθ+d, the diameters (d) and (D) of each inner edge (4a) and (6a) are set so that the following formula holds true. In other words, the angle (a ) are smaller than the angle of repose (θ) of the powder, both the upper and lower valve seats (4) and (6) are arranged, and the tapered passage of the lower valve seat (6) and the The taper angle (β) of the tapered flow path (F) of the matching lower valve box (1b) is configured to be smaller than the angle of repose (θ) of the powder.

With such a configuration, the flow path (F) can be opened and closed by sliding the valve body (9) as appropriate, and in the open state, the upper valve seat(
Even if the powder is transported falling by contacting the inner edge (4a) of the lower valve seat (6), it will not fall by contacting the inner edge (6a) of the lower valve seat (6). Therefore, the valve body (9
) to close the flow path (F), the transported powder does not get caught between the valve body (9) and the lower valve seat (6), and the various types described at the beginning are avoided. You can expect good results.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the valve for powder-containing gas according to the present invention, FIG. 1 is a longitudinal sectional front view, FIG. 2 is a longitudinal sectional front view showing the flow of powder, and FIG. 3 is a longitudinal sectional front view showing the flow of powder. is a longitudinal sectional front view showing a conventional structure. (1a), (1b)... Valve box, (4)...
... Upper valve seat, (4a) ... Inner edge of upper valve seat, (6) ... Lower valve seat, (6a) ...
... Inner edge of lower valve seat, (9) ... Valve body,
(F)...Flow path, (1)...Line connecting both inner edges, (α)...Angle between line (A) and horizontal line, ( θ)・・・Angle of repose of transported powder.

Claims (1)

[Claims] A valve body (9) that opens and closes the flow path (F) in the valve boxes (1a) and (1b) facing vertically downward.
is provided so as to be slidable in an almost horizontal direction, and this valve body (9
) A valve for powder-containing gas that is provided with an upper valve seat (4) and a lower valve seat (6) that are in sliding contact with the upper and lower surfaces of the valve bodies (4) and (6), respectively. 9) The inner edge of the sliding contact part (
The angle between the line (1) connecting 4a) and (6a) and the horizontal line (
A valve for a powder-containing gas, wherein both the valve seats (4) and (6) are arranged so that the angle of repose (θ) of the powder is smaller than the angle of repose (θ) of the powder.