JPH0219663Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of a Gotsuguru valve for use in a gas passage containing a large amount of dust, such as in a blast furnace or ore sintering facility.

(Prior art) Generally, a pair of flow pipes are provided coaxially on opposing surfaces of a valve body, a fixed valve seat and a movable valve seat are provided at the inner end of the flow pipe, and a valve seat is provided between the valve seats for opening. A Gotsuguru valve is used in which a valve body or a closing valve body is sandwiched between the two flow path cylinders to establish a communication state or a cutoff state.

In addition, such a Gotuguru valve has a dovetail groove in a double groove arrangement on the valve seat contact portion of the opening valve element and the closing valve element, and O-rings for sealing are installed in each of the dovetail grooves. is inserted so that its end protrudes from the surface of the valve body, and a gas purge hole is provided at a corresponding position between the two O-rings of both the movable and fixed valve seats, and a gas purge hole is inserted into the flow path cylinder from this gas purge hole. In comparison, a gas seal structure is adopted in which high-pressure gas is supplied and the high-pressure gas is sealed between both O-rings.

(Problem to be solved by the invention) However, in such a Gotuguru valve, it is necessary to form double annular dovetail grooves in the part of the valve body that abuts the valve seat, which requires a lot of labor to process. It was something I needed. In addition, since an O-ring with a circular cross section is used, the end protruding from the surface of the valve body is easily worn out, and since two such O-rings are used, the sealing material must be replaced frequently. The work was troublesome. Furthermore, O-rings have less deflection than they originally had, and as they wear out, the deflection becomes smaller and the gap between the metal surfaces of the valve seat and valve body becomes smaller, causing dust to get caught in this gap and resulting in an incomplete seal. There were problems such as.

In view of these conventional problems, the present invention allows for easy machining of the part into which the sealing material is inserted, and also prevents the protruding end of the sealing material from being worn out, which reduces the frequency of seal replacement and prevents dust from getting caught. The purpose is to provide a difficult-to-understand Gotsuguru valve.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a Gotsuguru valve similar to the conventional one, in which each movable and fixed valve seat has an annular gas sealing recess on the surface facing the valve body. A groove is provided, and a high pressure gas supply path is communicated and opened in the groove,
and an elastic material having a flat valve seat abutting surface on the valve seat side on each valve seat facing surface of both the valve bodies, and closing the opening of the groove with the valve seat abutting surface. It is characterized by the addition of a sealing material.

(Function) In the Gotuguru valve configured as described above, when the opening valve body or the closing valve body is sandwiched between the movable valve seat and the fixed valve seat, the valve seat abutting surface of the seal material touches each valve seat. Since each valve seat and the valve body are in contact with each other, a gap corresponding to the deflection of the sealing material is provided between each valve seat and the valve body.

Furthermore, high pressure gas is supplied into the groove closed by the sealing material through a high pressure gas supply path to perform so-called gas filling.

(Example) Next, an example of implementation of the present invention will be described with reference to the drawings. The Gotsuguru valve of this embodiment has a valve box 1, within which the tips of a pair of channel tubes 2 and 3 are coaxially arranged and opposed to each other. A fixed valve seat 4 is fixed to the tip of one of the channel tubes 2. A movable tube 6 is fitted concentrically to the outer periphery of the tip of the other channel tube 3, and a movable valve seat 7 is fixed to the tip of the movable tube 6. The back surface of the movable valve seat 7 and the flow path tube 3
There is a bellows 9 between the flange 8 formed on the outer periphery of the
are connected. In addition, a plurality of metal fittings 10 are protruded from the back surface of the movable valve seat 7 at regular intervals, and the tip of an in/out rod 11a of a hydraulic cylinder 11 fixed to the end face of the valve box 1 is connected to the metal fittings 10. The movable valve seat 7 is moved opposite the fixed valve seat 4 by driving the in/out rod 11a.

On the other hand, a valve body support frame 12 is supported within the valve box 1 so as to be slidable in the horizontal direction. A closing valve element 13 and an opening valve element 14 are inserted into a through hole formed in the valve element support frame 12 at a distance in the length direction of the valve element support frame 12, and can be replaced by screws. is fixed to. A support plate 15 for hanging is attached to the upper edge of the valve body support frame 12.
is integrally provided, and its lower surface is supported on a support roller 16 protruding from the inner surface of the valve body 1.
A rack 18 with a large number of pins 17 horizontally mounted is formed on the upper surface of the support plate 15. A driving pinion 19 is engaged with the rack 18, and the pinion shaft 19 is engaged with the rack 18.
The valve body support frame 12 is slid by rotating the valve body a with the motor 20. On the other hand, a closing valve body 13 and an opening valve body 14
As shown in Fig. 3, there is a wide sealing material fitting groove 2 formed in an annular shape on the surface facing each valve seat.
1a and 21b are bored.

Annular sealing materials 22a and 22b are fitted into the sealing material fitting grooves 21a and 21b, respectively, together with sealing material holding rings 23a and 23b.

Both sealing materials 22a and 22b have a substantially rectangular cross section, and one of the locking portions protruding from the valve body side ends of both the inner and outer edges is engaged with the valve body, and the other is used as a sealing material presser. It is inserted in a state where it is held between the rings 23a, 23b and the valve body.

Further, the ends of both sealing materials 22a and 22b on the valve seat side protrude from the surface of the valve body.

On the other hand, the sealing material holding rings 23a and 23b are removably fixed to the valve body by screws 24a and 24b, respectively. Remove these screws 24a, 24b, and seal material holding rings 23a, 23b.
By removing the seal members 22a and 22b, the seal members 22a and 22b can be easily removed from the valve body.

Further, in each of the valve body facing surfaces of the fixed valve seat 4 and the movable valve seat 7, an annular groove 25a for gas sealing is disposed facing the substantially central portion between the outer peripheral edge and the inner peripheral edge of each sealing material 22a, 22b. , 25a are formed.

High-pressure gas supply passages 26a and 26b are opened in both grooves 25a and 25b at intervals in the circumferential direction. Both high pressure gas supply paths 26a and 26b are
The valve seats 4 and 6 are connected to ring-shaped high-pressure gas introduction passages 27 and 28 formed on the back surface thereof, respectively, and a high-pressure gas supply passage 30 is communicated with the introduction passages 27 and 28, respectively. The purge gas is usually _N2 .
Use gas.

The Gotsuguru valve configured in this way is connected to both valve seats 4 and 7 by the above-mentioned high pressure gas supply paths 29 and 30.
Immediately before sandwiching either the valve body 13 or 14 between them, high-pressure N ₂ is supplied to blow off the dust adhering to the facing surfaces of the valve body 13 or 14 and both valve seats 4, 7. Either valve body 13 or 14 between 7
_N2 gas is supplied even when the parts are being held. In addition,
The pressure of this N ₂ gas is set to be slightly higher than the gas pressure within the flow path. As a result, high-pressure gas is sealed in the annular grooves 25a and 25b formed in both valve seats 4 and 7, and gas leakage from the inside of the flow path cylinder to the outside is completely prevented.

(Effect of the invention) The present invention is constructed as described above, and both the movable and fixed valve seats are provided with gas sealing grooves with communicating openings for high-pressure gas supply passages, and both the opening and closing valves are A sealing material made of an elastic body having a valve seat abutting surface on the valve seat side and closing the opening of the groove with the valve seat abutting surface is attached to each valve seat facing surface of the body. This makes it possible to create an airtight seal with a gas seal, and since only one groove is required for inserting the sealing material, much effort is not required for machining, and the seal has a flat valve seat contact surface. By using this material, the deflection margin can be increased, that is, the distance between the valve seat and the valve body can be made larger. Furthermore, since the deflection margin is less likely to decrease due to wear, it is easy to maintain this distance. It has excellent sealing properties with less jamming, and it also reduces the need to replace the seal material due to wear, making replacement work easier.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted longitudinal cross-sectional view of an embodiment of the Gotsuguru valve according to the present invention, and FIG.
FIG. 3 is a partial longitudinal sectional front view of the closing valve body and the opening valve body portion, and FIG. 3 is an enlarged sectional view of the opening valve body and both fixed and movable valve seat portions. DESCRIPTION OF SYMBOLS 1... Valve box, 2, 3... Channel cylinder, 4... Fixed valve seat, 6... Movable cylinder, 7... Movable valve seat, 9... Bellows, 12... Valve body support frame, 13... ... Valve body for closing, 14... Valve body for opening, 22a, 22b...
...Sealing material, 23a, 23b...Sealing material holding ring, 24a, 24b...Screw, 26a, 26
b...High pressure gas supply path.

Claims (1)

[Scope of utility model registration request] It has a pair of flow pipes with their tips facing each other in a concentric arrangement within the valve box, a fixed valve seat is attached to the tip of one flow pipe, and a slidable valve seat is attached to the other flow pipe. A movable cylinder is fitted, a movable valve seat is attached to the tip of the movable cylinder, and a valve body having an opening valve body and a closing valve body between the fixed valve seat and the movable valve seat in the valve box. In a goggle valve having a structure in which a support frame is slidably disposed and the opening valve element or the closing valve element is held between the two valve seats by movement of the movable valve seat, each valve seat has the A gas sealing groove having an annular shape is provided on the surface on the side of the valve body, and a high-pressure gas supply path is communicated and opened in the groove, and
A seal made of an elastic material, which has a flat valve seat abutting surface on the valve seat side on each valve seat facing surface of both the valve bodies, and closes the opening of the groove with the valve seat abutting surface. The Gotsuguru valve is characterized by the fact that it has a material attached to it.