JPH0227550B2 - GANFUNTAIGASUYOBEN - Google Patents

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 a vertically downward direction in a valve box is provided so as to be slidable in a substantially horizontal direction, and the upper and lower surfaces of this valve body are 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. 3, an upper valve seat 4 and a lower valve seat 6' are provided above and below the valve body 9, which are in sliding contact with the valve body 9. However, both valve seats 4 and 6' were constructed to have openings of approximately the same diameter. In other words,
The structure was such that the angle α' between the horizontal line and the line l' connecting the inner edges 4a, 6a' of the sliding portions of the valve seats 4, 6' to the valve body 9 was approximately a right angle (for example, Jitsuganaki
59-155404).

[Problem that the invention seeks to solve]

Therefore, in 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 inner edge 6a' of the lower valve seat 6'. It was in contact. In this state, the valve body 9
As the valve slides and closes, the transported powder gets caught between the valve body 9 and the lower valve seat 6a', which causes the powder to leak from between the valve body 9 and the lower valve seat 6a'. There are disadvantages in that the gas in the flow path F may leak, or the opening/closing operation of the valve body 9 becomes difficult, or in the worst case, the operation becomes impossible. Furthermore, if the transported powder is hard,
The bite of the powder damages the lower surface of the valve body 9 and the upper surface of the lower valve seat 6a', which sometimes causes gas leakage.

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 valve seats are arranged so as to be smaller than a corner.

[Effect]

Therefore, when the valve body is opened to transport the powder-containing gas, the powder that is transported near the center of the flow path naturally comes into contact with the inner edge of the upper valve seat and is transported falling. The powder also does not come into contact with the inner edge of the lower valve seat, so when the valve body is slid closed,
Transported powder will not be caught between the valve body and the lower valve seat.

〔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 arranged one above the other in a cylindrical shape. A cylinder body 2 is fitted into the lower part of the upper valve box 1a via a seal member 3 in a state where it communicates 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 cylindrical body 2, and a disc spring 5 interposed between the valve seat 4 and the cylindrical body 2 Therefore, the valve seat 4 is elastically biased downward. On the other hand, a lower valve seat 6 made of ceramics and having a tapered passage with a downward convergence is fitted into the upper part of the lower valve box 1b via a sealing member 7 in a state where it communicates with the flow passage F. Lower valve seat 6
A valve body 9 made of ceramics and having a through hole 8 substantially aligned with the passageway of the upper valve seat 4 is slidably provided between the upper valve seat 4 and the upper valve seat 4 .

Then, the diameter d of the inner edge 4a of the upper valve seat 4 portion that comes into sliding contact with the valve body 9, the diameter of the inner edge 6a of the lower valve seat 6 portion is D, the wall thickness of the valve body 9 is t, and the flow path When the angle of repose of the powder transported in F is θ,
The diameters d and D of each inner edge 4a and 6a are set so that the formula D>2t/tanθ+d is established. In other words, the angle α between the horizontal line and the line l connecting the inner edges 4a and 6a of the sliding portions of the upper and lower valve seats 4 and 6 to the valve body 9 is smaller than the angle of repose θ of the powder. Both the upper and lower valve seats 4 and 6 are arranged, and furthermore, the taper angle β of the tapered passage of the lower valve seat 6 and the tapered passage F of the lower valve box 1b that matches the lower valve seat 6 is adjusted.
are both 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 appropriately, and in the open state, as shown in FIG. 2, the inside of the upper valve seat 4 Even if powder is transported falling while abutting against the edge 4a, it will not abut against the inner edge 6a of the lower valve seat 6 and fall. Therefore, when the valve body 9 is slid 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 problems described at the beginning can be avoided. You can expect good results.

[Brief explanation of drawings]

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, l...Line connecting both inner edges, α...Angle between line l and horizontal line, θ...Transported powder angle of repose of the body.

Claims (1)

[Claims] 1. A valve element 9 for opening and closing the flow path F is provided to be slidable in a substantially horizontal direction with respect to the flow path F in the valve boxes 1a, 1b that extends vertically downward, and this valve element 9
In a powder-containing gas valve provided with an upper valve seat 4 and a lower valve seat 6 that are in sliding contact with the upper and lower surfaces, the inner edge of the portion of the valve seats 4 and 6 that comes into sliding contact with the valve body 9 4a,
A valve for a powder-containing gas in which both valve seats 4 and 6 are arranged such that an angle α between a line l connecting 6a and a horizontal line is smaller than an angle of repose θ of the powder.