JPH0222536Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] 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, there are
There was an upper valve seat and a lower valve seat that were in sliding contact with the valve body, but since both valve seats were fixed to the upper and lower valve bodies, the upper and lower valve seats It is unavoidable that the transported powder gets caught between the two valve seats, resulting in disadvantages such as the valve becoming inoperable and gas leakage. Therefore, as shown in FIG. 5, one of the two valve seats 4 and 6 is constructed to be movable relative to the valve body 1a, and a disc spring is installed between the movable valve seat 4 and the valve body 1a. 5 is interposed so that both the valve seats 4 and 6 are always in elastic pressure contact with the valve body 8, and the transported powder is caught between the valve body 8 and both the valve seats 4 and 6. A structure designed to prevent this as much as possible has been proposed (for example, Utility Model Application No. 155404/1983).

[Problem that the invention attempts to solve]

However, in this prior application structure, the transported powder directly contacts the inner edges 4a, 6a of both the upper and lower valve seats 4, 6, especially the inner edge 4a of the upper valve seat 4, so the valve body Although it is possible to prevent the powder from getting caught between the valve seat 8 and the upper valve seat 4, it is not yet perfect and some amount of getting caught is unavoidable.

The present invention was devised in view of these circumstances, and is a valve for powder-containing gas that can more effectively prevent transported powder from being caught between the valve body and the upper valve seat. The purpose is to provide.

[Means for solving problems]

In order to achieve this purpose, the powder-containing gas valve according to the present invention has a sleeve pipe that comes into contact with the upper surface of the valve body upstream of the valve body and inside the upper valve seat. , the sleeve pipe is elastically biased toward the valve body.

[Effect]

In this way, since the sleeve pipe disposed inside the upper valve seat is brought into elastic pressure contact with the upper surface of the valve body, the transfer of the transported powder to the upper valve seat side is prevented by this sleeve pipe. blocked. Of course, some of the transported powder will get caught between the sleeve pipe and the valve body, but the chances of the stuck powder moving beyond the sleeve pipe to the upper valve seat are extremely small.
Transported powder rarely comes into contact with the inner edge of the upper valve seat.

[Effect of idea]

As described above, since there is almost no contact between the transported powder and the inner edge of the upper valve seat, the powder is effectively prevented from being caught between the upper valve seat and the valve body. Inability to open/close operations and gas leaks due to jamming can be more reliably avoided.

〔Example〕

An embodiment of the present invention will be described based on the drawings. As shown in FIG.
A and a lower valve box 1b are arranged concentrically one above the other, and a cylinder 2 is fitted into the lower part of the upper valve box 1a via a sealing member 3 in communication with the flow path F. ing. An annular upper valve seat 4 made of stainless steel coated with stellite or tungsten carbide is located below the cylindrical body 2.
The valve seat 4 is elastically biased downward by a disc spring 5 interposed between the valve seat 4 and the cylindrical body 2. On the other hand, in the upper part of the lower valve box 1b, there is a lower valve seat 6 made of ceramic having a tapered passage with a downward convergence.
A valve element 8 is slidably provided between the lower valve seat 6 and the upper valve seat 4.

This valve body 8, as shown in FIGS. 2 to 4,
Valve body part 8a slidingly contacts both upper and lower valve seats 4 and 6
and a valve body frame portion 8b that holds the valve body body portion 8a from the periphery. Valve body part 8a
is formed in a shape with as few corners as possible, such as a circular or track shape when viewed from above, and a through hole 8c is provided in a part of the through hole 8c that almost aligns with the upper passage, and a through hole 8c is provided on the longitudinal side of the hole 8c. A groove into which a pin 9 having a circular cross section is fitted is provided, and the entire valve body body 8a is made of ceramics. The valve body frame portion 8b is formed into a substantially rectangular shape in a plan view, and has an opening in the center that matches or is slightly smaller than the outer shape of the valve body body portion 8a, and has a longitudinal side portion of the opening. have grooves into which the pins 9 fit, and three through holes 8, respectively.
d, and one end is provided with a notch 8e that engages with a valve operating shaft (not shown), and the entire valve body frame 8b is made of a metal material such as stainless steel or steel. There is. And this valve body frame part 8b
The valve body 8a is shrink-fitted to the valve body 8a at a temperature of about 300° C., or the longitudinal sides of the valve body 8a press the pin 9 or the pin 9 toward the valve body 8a. The valve body frame 8 is preferably fixed by a spring 10 inserted into the through hole 8d, a plug screw 11 screwed into the through hole 8d, etc.
It is firmly held in b.

Upstream of the valve body 8 and on the upper valve seat 4
A sleeve pipe 12 made of steel and having a circular cross section is disposed inside the sleeve pipe 12, and a disc spring 13 interposed between the sleeve pipe 12 and the cylindrical body 2 causes the sleeve pipe 12 to connect to the valve body. It is configured to come into contact with the upper surface of the valve body main body 8a of No. 8 and press it elastically. Furthermore, in the space S formed between the sleeve pipe 12 and the cylinder body 2 and the upper valve seat 4, there is a supply hole 14 formed in the cylinder body 2 and the upper valve box 1a, and a supply hole 14 formed in the cylinder body 2 and the upper valve box 1a.
4, a purge gas such as nitrogen is supplied through a pipe 15 communicating with the valve body 8a, and as shown by the arrow in FIG. It is configured to send out to the center side of the flow path F of the side valve box 1b.

Then, the diameter of the inner edge 4a of the upper valve seat 4 portion that comes into sliding contact with the valve body 8 is d, the diameter of the inner edge 6a of the lower valve seat 6 portion is D, the wall thickness of the valve body 8 is t, and the flow rate is d. If the angle of repose of the powder transported in path F is θ, then the formula D>2t/tanθ+d holds.
The diameters d and D of each inner edge 4a and 6a are set. In other words, the angle α between the horizontal line and the line l connecting the inner edges 4a and 6a of the sliding contact portions of the upper and lower valve seats 4 and 6 with the valve body body 8a is smaller than the angle of repose θ of the powder. Both the upper and lower valve seats 4 and 6 are arranged so that 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 as follows. Both are constructed so that the angle of repose θ of the powder is even smaller.

With such a configuration, the flow path F can be opened and closed by appropriately sliding the valve body 8. In this case, the valve body 8a of the valve body 8 is elastically abutted against the upper surface of the valve body 8a. The sleeve pipe 12 reliably prevents the transported powder from moving toward the upper valve seat 4. Moreover, even if powder gets caught between the sleeve pipe 12 and the valve body 8a and moves beyond the sleeve pipe 12 to the upper valve seat 4 side, the purge gas will ensure that the powder is not removed from the lower valve body 1b. Since it is blown away into the flow path F, it does not get caught between the upper valve seat 4 and the valve body 8a. Furthermore, regarding the lower valve seat 6, the inner edge 4 of both the upper and lower valve seats 4, 6
Since the angle α between the line l connecting a and 6a and the horizontal line is smaller than the angle of repose θ of the transported powder, there is no possibility that the powder will contact the inner edge 6a of the lower valve seat 6 and fall. Therefore, powder is reliably prevented from getting caught between the lower valve seat 6 and the valve body 8a. Regarding the valve body 8, since the valve body body 8a that the transported powder comes into contact with is made of ceramics, wear of the valve body body 8a is prevented as much as possible even if the transported powder is hard. Furthermore, even if the conveyed gas is at a high temperature and therefore the valve body 8 itself becomes quite high temperature, the valve body part 8a and the valve body frame part 8b
The wobbling caused by the difference in expansion rate between the valve body and the valve body is absorbed by the spring 10 in the through hole 8d, so that the valve body 8a is always firmly held in the valve body frame 8b.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the valve for powder-containing gas according to the present invention, in which FIG. 1 is an overall longitudinal sectional front view, FIG. 2 is a plan view of the valve body, and FIG. Inside-
FIG. 4 is a cross-sectional view taken along the - line in FIG. 2, and FIG. 5 is a vertical front view showing the structure of the prior art. 1a, 1b... Valve box, 4... Upper valve seat, 6...
Lower valve seat, 8... Valve body, 12... Sleeve pipe, F
...Flow path.

Claims (1)

[Scope of utility model registration request] A valve element 8 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 extending vertically downward, and the upper and lower surfaces of the valve body 8 are provided. The upper valve seat 4 and the lower valve seat 6 are in sliding contact with each other.
In the valve for powder-containing gas, the valve body 8
A sleeve pipe 12 that abuts the upper surface of the valve body 8 on the upstream side and inside the upper valve seat 4.
A powder-containing gas valve is provided with a sleeve pipe 12 and elastically biased toward the valve body 8 side.