JPS5824671A - Device for cleaning valve seat of swing valve - Google Patents

Abstract

PURPOSE:To automatically clean the valve seats of a valve element and a valve casing when the valve is closed, by providing a scrape-off member slidable on a guide flange on the peripheral part of the valve seat of the valve casing and by providing another scrape-off member slidable on the surface of the valve seat of the valve element. CONSTITUTION:When a valve spindle 2 is turned counterclockwise by an appropriate drive means in order to close a valve element 3 from its fully open position, the valve element is gradually swung upward through an arm 4. At the same time, a guide lever 22 secured on a guide shaft 21 interlocked with the valve spindle 2 is swung in the same direction so that the rollers 19, 19' of a scrape-off member 17 fitted at one end in the slender groove 23 of the lever move on the reverse side of the valve element 3 to scrape off garbage or the like from the surface of the valve seat 16 of the valve element. A coupling lever 24 is moved up by the swing of the guide lever 22 so that another scrape-off member 11 pivotally connected at 25 to the tip of the coupling lever slides with rollers 13, 13' on a guide flange 10 to scrape off garbage or the like from the surface of the valve seat 9 of a valve casing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve seat cleaning device for a swing type valve connected to a dust transport pipe or a fluid pipe containing dust.

Conventional swing-type valves, such as valves that are connected to waste transport pipes that allow dust to fall naturally in vertical pipes, and open and close by forcibly swinging the valve body, or valves that are connected to dust transport pipes that use horizontal pipes to open and close dust The connected next swing check valve is equipped with a cleaning device that sprays water, steam, or air force on the valve seat (valve box seat) installed on the valve body side, but the valve seat on the valve body side seat(
No such device was installed on the valve body (valve seat). Therefore, the valve body valve seat is cleaned, but the valve body valve seat is not cleaned, so there is a possibility that the adhesion between the valve body valve seat and the valve body valve seat is incomplete due to dirt and dust adhering to the valve body valve seat. Otherwise, the valve seat may be damaged and airtightness cannot be maintained, and equipment and maintenance costs are high because a pressurizing device for cleaning fluid and supply piping are required on the valve seat side of the valve box. It had drawbacks such as being expensive.

SUMMARY OF THE INVENTION An object of the present invention is to provide a valve seat cleaning device for a swing type valve that can eliminate the drawbacks of the conventional devices.

The present invention will be described with reference to embodiments shown in the drawings.

The drawing shows an example in which the present invention is applied to a swing type valve connected to a waste transportation pipeline. In the figure, 1 is a valve box installed in a vertical pipe, 2 is a valve stem that is pivotally supported through the valve box 1, and 3
is a rectangular valve body which is fixed to the inner part of the valve body of the valve stem 2 via an arm 4, and this valve body 3 swings upward by rotating the valve stem 2, and the valve body flow rate 5 It is positioned so as to be able to come into contact with the truncated conical valve port pipe 6 provided protruding toward the inside of the valve box to close the valve lower, and from this position, by rotating the valve stem 2 in the opposite direction, the valve stem 2 is rotated downwardly. It swings to open the valve lower. 8 is a pin for attaching the valve body 3 to the arm 4.

A valve box valve seat 9 is fixed to the outer periphery of the valve lower of the valve port pipe 6, and the valve box valve seat 9 is provided with a square guide flange 10 on the outer periphery.

A scraping member 11 is disposed on the guide flange 10 so as to be slidable up and down, and is adapted to scrape off scum and dust that adheres to the surface of the valve seat 9 of the valve box. The scraping member 11 is the fourth
, As shown in FIG. 5, the side plates 12 are bent upward at right angles and arranged in a row on both sides, and two rows 213 are placed inside the side plates 12 with a gap slightly larger than the thickness of the valve box valve seat 9. 1
3' is arranged so as to be located on the upper surface of the guide flange 10, and the roller 14 is arranged below the rows 213 and 13' so as to be located on the lower surface of the guide flange 10. A shielding plate 15 is provided between the seats 9.

A valve seat 16 is embedded in the outer peripheral edge of the inlet side of the valve body 3 that contacts the valve box seat 9 so as to be flush with the upper surface of the valve body 3. A scraping member 17 is disposed on the valve body 3 so as to be slidable up and down, and scrapes off dirt and dust that adhere to the surface of the valve seat 16 of the valve body. As shown in FIG. 6, the scraping member 17 has a side plate 18 bent downward at a right angle on both sides thereof, and is connected with the scraping member 17, with a gap slightly larger than the thickness of the valve body 3 being formed on the inside of the side plate 18. Rows 219 and 19' are disposed, and a roller 20 is disposed coaxially with the roller 19' on the outer side.

A guide shaft 21 is supported in the valve body 1 on the back side of the valve body in parallel with the valve rod 2. An abbreviated guide lever 22 is pivotally supported at both ends of the guide shaft 21, and a guide groove 23 is formed at the tip of one arm of the guide lever 22, and the row 220 can slide through this groove. is engaged in. A proximal end portion of a connecting lever 24 is pivotally supported at the tip of the other arm of the guide lever 22, and a leaking portion of the connecting lever 24 is attached to the outside of the side plate 12 of the scraping member 11 coaxially with the roller 13. It is connected to the storage bin 25. Therefore, as the valve body 3 opens and closes, the guide lever 22 swings around the guide shaft 21, and the connecting lever 24 also moves following the swing of the companion lever 22, so that the scraping member 17 is removed from the valve body. Valve seat 16
The scraping member 11 overflows the surface of the valve box valve seat 9 and slides up and down at the same time.

At one end of the guide shaft 21 passing through the valve box l, a second
As shown in the figure, a scraping lever 26 is fixed, and a weight 27 and a roller 28 are attached to this lever 26 for applying downward rotational force. An operating lever 29 is fixed to one end of the valve stem 2 that has passed through the valve body 1 that corresponds to the scraping lever 26, and this lever 29 has a long groove 30 formed in its lower end, and this groove is connected to the row 228. A guide bar 31 slidably engaged with the guide bar 31 is telescopically supported by a screw. A counterweight 32 is fixed to the tip of the operating lever 29. In addition, 33 in FIG. 2 is a sprocket fixed to the other outer part of the valve stem 2, and is connected to a drive device (not shown). A stopper 34 is a stopper attached to the bracket of the valve body l at the ninth point to prevent the downward rotation of the scraping lever 26. In FIG. The stopper 36 is attached to the lower end of the guide flange 10 and is the stopper of the scraping member 11, which is the outlet of the valve box 37Fi in FIG.

Next, the operation of the above embodiment will be explained.

When the valve stem 2 is rotated from the fully open position of the valve body shown in FIG. 1 in the valve body closing direction via the sprocket 33, the valve body 3 gradually swings upward. At the same time, the actuating lever 29 fixed to the valve stem 2 also rotates, and the actuating lever 29 moves the guide bar 31 downward, and the oyster salt lever 26, which is engaged with the guide lever 31 by the row 228, is also rotated by the action of the weight 27. Centering around the guide shaft 21, the position il comes into contact with the stopper 34 shown by the line in FIG.
Rotate until. Along with this rotation, the next guide lever 22, which is fixed to the guide shaft 21, also swings upward according to the upward movement of the valve body 3, with the roller 2o sliding in the guide groove 23, so that one side of the guide lever 22 The roller 2o is engaged with the long groove 23 formed at the tip of the arm of the scraping member 17.
The rollers 19 and 19' run on both sides of the valve body 3 and slide from the bottom to the top of the valve body 3, and during this sliding, the valve body valve seat 1
Scrape the surface of step 6 and scrape off any dirt. On the other hand, since the connecting lever 24 also moves upward due to the swinging of the guide lever, the scraping member 11 connected to the tip portion of the connecting lever 24 by the pin 25 is also lowered so that the upper surface of the guide flange lO The roller 14 runs along the lower surface and slides from below to above the guide flange 10,
During this sliding, the fc waste etc. adhering to the surface of the valve box valve seat 9 are scraped off. Then, the raking lever 26 is moved to the stopper 34.
When it comes into contact with both scraping members 17. as shown in FIG.
11 are respectively stopped at the upper ends of the valve body 3 and guide 7 flange 10, and the valve body valve seat 16 and the valve body valve seat 9 are in close contact with each other,
The valve body 3 closes the valve lower portion of the valve port pipe 6. At this time, the scraping member 11 is located above the scraping member 17, and the two members do not come into contact with each other.

Next, when the valve stem 2 is rotated in the opposite direction to the above via the sprocket 33 from this valve body fully closed position, the valve body 3 gradually swings downward to open the valve lower.

At the same time, the actuating lever 29 also rotates in the opposite direction, and the actuating lever 2
9 moves the guide bar 31 upward, and the guide bar 31 and r:z
- When engaged at t2g, the next scraping salt lever 26 is also moved to the guide shaft 21.
It rotates in the opposite direction around , to the original position shown by the solid line in FIG. Along with this rotation, the guide lever 22 fixed to the guide shaft 21 also swings downward as the roller 20 slides in the kite groove 23, following the downward movement of the valve body 3.
Scraping member 1? slides from above to below the valve body 3, and during this sliding, scrapes off dust and the like that adhere to the surface of the valve seat 16 of the valve body. On the other hand, due to the swinging of the guide lever 22,
Since the connecting lever 24 also moves downward, the scraping member 11
slides from above to below the guide flange lO, and scrapes off dust and the like that adhere to the surface of the valve seat 9 of the valve box during sliding. Then, the scraping member 17 and the scraping member 11 contact the stopper groove 35 and the side plate 12 respectively and stop, and the scraping lever 22 also engages the roller 28 with the lower end of the long groove 30 of the guide bar 31. This prevents further rotation of the first operating lever 29 and the valve stem 2, and the valve body 3 fully opens the valve lower. As mentioned above, by one opening/closing operation of the valve body 3, both the valve body valve seat 9 and the valve body valve seat 16Ifi are
Cleaned twice.

In the above embodiment, a swing-type valve connected to a vertical pipe is described; however, the present invention is not limited to this, and can also be applied to a horizontal pipe, for example, a fluid pipe containing dust. It goes without saying that the detailed design of this invention can be changed as appropriate.

This invention is constructed as described above and has the following features, so that it is possible to clean not only the valve body valve seat but also the valve body valve seat, and both valve seats can be brought into close contact when the valve body is closed. Therefore, the flow of fluid from the valve box inlet can be completely shut off, and both valve seats will not be damaged by dirt or dust adhering to them, so they can maintain a long service life and maintain perfect airtightness. I can do it. In addition, since there is no need for a pressurizing device or supply piping for the cleaning fluid, equipment and maintenance costs are low.
Moreover, it has excellent effects such as a simple structure and easy manufacture.

[Brief explanation of the drawing]

1 is a longitudinal side view of one embodiment of the present invention, FIG. 2 is a longitudinal rear view, FIG. 3 is an enlarged sectional view of the main parts, FIG. 4 is an enlarged side view of the scraping member 11, and FIG. 5 is a front view taken along the line ■-■ in Fig. 4, and Fig. 6 shows the scraping member 17;
) is a side view, (b) is a plan view, and FIG. 7 is a side view showing a connecting member between the valve stem and the guide shaft. 1...Valve box 2...Valve rod 3...Valve
Salary 5...Benhan style population 9...Ben box Bent seat
10... Guide 7 Lunge 11... Scraping member
16... Valve body valve seat 17... Scraping member 21.
・・Guide shaft 22 ・・Guide lever 4 fig. 6 (a) 7 18 20

Claims (1)

[Claims] 1. A valve body having a valve seat is disposed in the valve box, and the valve body is oscillated and placed at the inlet of the valve box, and the valve seat is positioned so that it can be brought into contact with the valve seat of the valve box. In a swing type valve provided with a valve stem, a guide flange is provided on the outer peripheral edge of the valve box valve seat,
A first scraping member that is slidable up and down along the surface of the valve seat of the valve body is disposed on the guide flange, and a first scraping member that is slidable up and down along the optical surface of the valve seat of the valve body is disposed on the valve body. A second scraping member is disposed, and a two-pronged swinging member is disposed on the guide shaft that penetrates the valve body and swings in accordance with the opening/closing operation of the valve body. 9, one end of the arm is engaged with the first scraping member, one end of the other arm is engaged with the 1s2 scraping member, and the other ends of both arms are pivotally supported on the guide shaft. A valve seat cleaning device characterized in that a shaft and a valve stem are connected via a connecting member.