KR20190126660A - Knife gate valve - Google Patents

Abstract

The present invention relates to a knife gate valve for controlling the transfer of a transferred material such as ash, dust and the like generated in a thermal power plant and transferred along a pipe. According to an embodiment of the present application, a knife gate valve comprises: a body which has a pipe connected to openings formed in both sides and through which a first sliding groove is formed to communicate with the opening; a disk coupled to the first sliding groove to be elevated to open and close the opening; a cap which is mounted on an upper portion of the body and through which a second sliding groove is formed so that the disk is elevated; and a suction block which is provided on an upper surface of the body and through which a third sliding groove is formed so that the disk is elevated. Inner passages are formed on an inner surface of the third sliding groove, and configured to reduce pressure when the pressure formed in the pipe passes through a gap between the disk surface and the third sliding groove.

Description

Knife Gate Valve {KNIFE GATE VALVE}

The present specification relates to a valve, and more specifically, to a knife gate valve for controlling the transfer of a transport material such as ash (ash), dust generated in the thermal power plant and transferred along the pipe.

Unless otherwise indicated herein, the contents described in this section are not prior art to the claims of this application, and inclusion in this section is not admitted to be prior art.

In general, a knife gate valve refers to a blocking plate having a blade, and lowers a knife gate having a semicircular blade end by actuating a pneumatic cylinder or a driving motor to seat a recess formed in a lower cross section of the gate groove. The valve is shut off accordingly.

In other words, the knife gate valve controls or opens and closes the flow path of the pipe line to transfer or block the transport material in which sludge such as wire, vinyl chips and coal combustibles is mixed, such as paper mills or thermal power plants, as well as fluids, pulp and cement. Used.

For example, in order to control the transfer of coal dust discharged from the thermal power plant, the knife gate valve is installed in the pipe to be opened and closed.

Although not shown in the drawings, the prior art knife gate valve

The packing member, which is in close contact with the circumference of the knife gate and keeps the airtightness, is stacked in a multi-stage manner to keep the airtightness to prevent leakage of the transport material such as dust.

At this time, a plurality of packing members may be worn by the knife gate in a state in which the portion in close contact with the gate wears down as the knife gate is repeatedly lifted and lowered, and thus the airtight force of the knife gate may decrease.

In this way, when the pipeline is blocked due to the lowering of the knife gate in the airtight state, the pressure due to the flow force of the conveying material is increased, and the conveying material is pushed to the upper part of the packing member through the gap between the guide balls. Therefore, a large amount of dust components such as ash may leak.

As a result, there is a problem that may damage the health of workers and cause air pollution or environmental pollution around the workplace.

In addition, the knife gate valve is applied to the metal seat or rubber seat according to the type of fluid and the purpose of use. Knife gate valve with metal seat is excellent in durability, but due to its contact structure between metal and metal, it is difficult to maintain perfect air tightness. Will have

Republic of Korea Patent Publication No. 10-0986206 "Multiple closed knife gate valve" is posted.

Embodiments herein relate to a knife gate valve, which makes it possible to prevent conveying material such as ash from being conveyed toward the hermetic packing of the valve body.

Embodiments herein relate to a knife gate valve, which eliminates the use of ancillary equipment to purify the leaked transport material by introducing the transport material leaking from the valve body back into the piping.

According to one embodiment of the present specification in order to achieve the above and other objects of the present specification,

A body having a pipe connected to the openings formed at both sides thereof and having a first sliding groove formed therein so as to communicate with the opening;

A disk coupled to the first sliding groove so as to be opened and closed to open and close the opening;

A cap mounted on the body and having a second sliding groove formed therethrough so that the disk is lifted and raised;

It is provided on the upper surface of the body provided with a suction block which is formed through the third sliding groove so that the disk is elevated,

A knife gate valve formed on an inner side surface of the third sliding groove, and having an inner passage for reducing pressure when a pressure formed in the pipe passes through a gap between the disk surface and the third sliding groove. To provide.

The present specification configured as described above has the following advantages.

By preventing leakage of conveying materials such as ash toward the airtight packing installed on the upper part of the valve body, it prevents harm to the health of the worker and prevents air pollution around the workplace, thereby having practicality and reliability.

In addition, as the transport material leaking from the valve body flows back into the pipe, it is unnecessary to use expensive auxiliary equipment for suctioning and purifying the leaking transport material, thereby reducing initial cost and maintenance cost. Will have price competitiveness.

1 is a perspective view of the combination of the knife gate valve according to a preferred embodiment of the present specification,
Figure 2 is an exploded perspective view of the valve shown in Figure 1,
3 is a longitudinal cross-sectional view of the valve shown in FIG.
4 is a cross-sectional view of the valve shown in FIG. 1, FIG.
Figure 5 is a partial cross-sectional perspective view showing the internal structure of the suction block in the valve shown in Figure 1,
Figure 6 is a partial cross-sectional perspective view showing the internal structure and the external structure of the suction block in the valve shown in Figure 1,
FIG. 7 is a view illustrating an inner passage formed in the stuffing box and a through hole formed in the suction block in the valve illustrated in FIG. 1;
8 is a view showing that a plurality of suction holes are formed in the stuffing box in the valve shown in FIG. 1;
9 (a, b) is a view showing a modification of the suction block in the valve shown in FIG.
FIG. 10 is a modified view of the valve shown in FIG. 1.

Hereinafter, a knife gate valve according to a preferred embodiment of the present specification will be described in detail with reference to the accompanying drawings.

1 to 9, the knife gate valve according to one embodiment of the present specification is

The first sliding groove 10 is formed in the vertical direction so as to communicate with the opening of the body 12 to which the pipe 11 is connected to the openings formed at both sides.

A disc 13 in the form of a plate for opening and closing the opening is liftably coupled to the first sliding groove 10.

The transport material remaining on the surface of the disk 13 (for example, ash, dust, etc. generated in a thermal power plant, etc.) is detached by an external suction means (refers to a vacuum pump, etc. not shown) and suctioned. The modular stuffing box 19 through which suction holes 15 are formed on both sides thereof is detachably mounted to the flange 12a of the body 12.

The second sliding groove 14 for guiding the disk 13 to be elevated is formed through the cap 16 mounted on the top surface of the stuffing box 19.

A third sliding groove 17 for guiding the disk 13 to be lifted and lowered is formed in one or more suction blocks 18 and 18a installed on the upper surface of the body 12.

The pressure generated inside the pipe 11 passes through the gap between the surface of the disk 13 and the third sliding groove 17 and passes toward the airtight packing 28 installed on the suction blocks 18 and 18a. An inner passage for preventing the cross section is formed at an arbitrary depth by forming a U-shaped cross section on the inner surface of the third sliding groove 17 of the suction blocks 18 and 18a.

The suction blocks 18 and 18a are replaceably housed in the inner space of the modular stuffing box 19.

Here, although the suction block 18 and 18a are illustrated and described as being included in the detachable modular stuffing box 19, the suction blocks 18 and 18a may be formed on the upper portion of the body 12 instead of the stuffing box 19. It may be provided in the lower portion of the cap (16).

5 and 6, the suction blocks 18 and 18a are

An outer passage 20 formed on one side of the suction block 18 so as to be in communication with the suction hole 15 and for dispersing the transport material sucked through the suction hole 15;

One or more distribution holes 21 for communicating the outer passage 20 and the third sliding groove 17;

A first inner passage 22 formed at an arbitrary depth on one inner side of the third sliding groove 17 so as to communicate with the distribution hole 21;

The second inner passage 23 is formed at a depth lower than the depth of the first inner passage 22 on the other side of the inner side of the third sliding groove 17 so as to face the first inner passage 22.

2, 3, 5, 6, when a pair of suction blocks (18, 18a) are stacked and installed,

The first and second suction blocks 18 and 18a, in which the outer passage 20, the distribution holes 21 and the first and second inner passages 22 and 23 are formed, are moved forward and backward with respect to the third sliding groove 17. Are arranged symmetrically.

That is, the outer passage 20 is formed on the front outer surface of the suction block 18 located below the drawing, and the outer passage 20 is formed on the rear outer surface of the suction block 18a located above the drawing.

As in Figure 6, the outer passage 20 is

A portion facing the suction hole 15 is formed to have a first width in the vertical direction, the first section 25 is formed with one or more first distribution holes 24,

The second section 27 is formed to communicate with the left and right sides of the first section 25, and a second width smaller than the first width is formed, and the second distribution hole 26 is formed with at least one.

As shown in FIG. 5, the diameter of the first distribution hole 24 is smaller than the diameter of the second distribution hole 26.

Here, although illustrated and described as having an outer passage on the outer surface of the suction block, a passage is formed in the stuffing box (or upper body or lower cap) corresponding to the outer passage of the suction block, the suction block and the upper outer passage and Distribution holes may be provided to allow the inner passage to communicate.

Suction blocks 18 and 18a

It is formed of any one of NBR rubber material, silicon material, EPDM, and viton material to have elastic force.

As shown in FIG. 2, when the transport material leaked from the pipe 11 for transporting the transport material is collected and introduced into the stuffing box 19 through the corresponding pipe (for example, duct (not shown)), suction A conveying material re-inlet hole 30 for passing the conveying groove 31 formed on the outer surface of the blocks 18 and 18a to be re-introduced into the pipe 11 is formed through the side of the stuffing box 19.

As in Figure 7, the knife gate valve (A) of the present specification is

An inner passage 19d formed on the inner side of the stuffing box 19 so as to communicate with the suction hole 15 of the stuffing box 19;

A distribution hole 21 is formed through the suction blocks 18 and 18a to communicate with the third sliding groove 17 of the suction blocks 18 and 18a and the inner passage 19d of the stuffing box 19.

As in Figure 8, the knife gate valve (A) of the present specification

When a plurality of suction holes 15 are formed in both sides of the stuffing box 19 in the up and down direction, a suction hole 18 for communicating the suction hole 15 and the third sliding groove 17 is provided with a suction block 18. Through 18a).

As in Figure 9a, the knife gate valve (A) of the present specification

The airtight packing 28 and the pressure reducing suction block 18 are replaceably accommodated in the upper and lower portions of the stuffing box 19, and are sealed by an inner passage 22a formed to face the inner surface of the suction block 18. Pressure supplied to the packing 28 may be reduced by reducing the pressure.

As in Figure 9b, the knife gate valve (A) of the present specification

Dispensing holes 21 to receive the airtight packing 28 and the pressure-reduction suction block 18 in the upper and lower parts of the stuffing box 19 to be interchangeable, and to communicate with the suction hole 15 of the stuffing box 19. It is formed to communicate with the inner passage (22a) of the suction block (18).

Therefore, the pressure supplied to the airtight packing 28 by the inner passage 22a formed to face the inner surface of the suction block 18 can be reduced by reducing the pressure. In addition, through the suction hole 15 and the distribution hole 21 and the inner passage 22a communicating with the suction means, the transfer material remaining on the surface of the disk 13 may be absorbed and discharged to the outside of the valve.

In the drawing, reference numeral 32 is formed through the flange 12a of the body 12 so as to communicate with the opening, and guides the transport material stuck to the surface of the disk 13 to stagnate or collect and fall toward the pipe 11. It is a discharge groove for

33 is a sealing packing mounted between the flange 12a of the body 12 and the bottom surface of the stuffing box 19,

34 is a packing for sealing the gap between the pipe 11 and the opening, which is coupled to the opening on the side from which the transport material is discharged, from the opening of the body 12.

Hereinafter, an example of use of a knife gate valve according to an embodiment of the present specification will be described with reference to the accompanying drawings.

1 to 9, an airtight packing 28 and a pipe (4) in which a fourth sliding groove 29 is formed to be in close contact and airtight when the disk 13 is elevated by a driving means (not shown). 11, suction blocks 18 and 18a are installed in the stuffing box 19 to reduce the pressure transferred from the airtight packing 28 to the airtight packing 28.

Upper and lower flanges 19a and 19b are integrally formed on the upper and lower portions of the stuffing box 19.

The upper flange 19a is detachably mounted to the cap 16 by a fastening member (not shown), and the lower flange 19b is a flange of the body 12 by a fastening member (not shown). Removably mounted to 12a).

As a result, when the airtight packing 28 or suction blocks 18 and 18a in the stuffing box 19 are worn or damaged and a replacement is required, the stuffing box 19 may be mounted on the flange 12a of the body 12. Loosen the fastening member to fasten the) to separate the stuffing box 19 from the body 12, and then the presence or absence of damaged packing 28 or suction block (18, 18a) in the stuffing box (19) It can be checked and replaced.

Although not shown in the drawing, the disk 13 includes a second sliding groove 14 formed through the cap 16 and a fifth sliding groove 19 c formed through the stuffing box 19 by a driving means installed thereon. The fourth sliding groove 29 formed through the airtight packing 28, the third sliding groove 17 formed through the suction block 18, and the first sliding groove 10 formed through the body 12 are formed. Accordingly.

That is, by opening and closing the pipe 11 by lifting the disk 13, it is possible to control the transport material to be transferred along the pipe (11).

At this time, the technical information for opening and closing the pipe 11 by the disk 13 is elevated in accordance with the operation of the drive means to control the transport material transported along the pipe 11 is commonly used in the art to which this specification belongs. Since the detailed description of these configurations will be omitted.

When the conveying material is conveyed at an arbitrary speed along the pipe 11, the pressure including the conveying material is the third sliding groove 17 and the disk of the suction blocks 18 and 18a in the lower part of the stuffing box 19. Passing through the gap between the (13) can be moved toward the airtight packing 28 in the upper portion of the stuffing box (19).

That is, the pressure for conveying the conveying material in the pipe 11 passes through the gap between the disk 13 and the third sliding groove 17 of the suction blocks 18 and 18a to be conveyed toward the airtight packing 28. In this case, the transport material may be sucked out of the stuffing box 19 by the suction means installed outside the knife gate valve A through the suction holes 15 formed on both sides of the stuffing box 19.

At this time, the transport material stagnant in the third sliding groove 17 of the suction blocks 18 and 18a or the transport material stuck to the surface of the disk 13 is detached by the suction force when the suction means (not shown) is driven to suck the suction material. Since the technical information discharged to the outside of the knife gate valve (A) through the ball 15 is commonly used in the technical field to which the present specification belongs, a detailed description thereof will be omitted.

That is, the conveying material detached from the surface of the disk 13 by the suction force of the suction means or the conveying material stagnant in the third sliding groove 17 is formed to face the inner surfaces of the suction blocks 18 and 18a. The inner passages 22 and 23, the distribution holes 24 and 26, the outer passages 20 formed on the outer surfaces of the suction blocks 18 and 18a, and the suction holes 15 of the stuffing box 19 in turn. As it passes through, it is discharged out of the knife gate valve A.

At this time, the outer passage 20 is a central portion (referred to as "first section 25") facing the suction hole 15 is formed in a large width (or deep) in the vertical direction, the first An edge portion (called "second section 27") formed to communicate with the left and right sides of the section 25 is formed with a small width (or a shallow depth) in the vertical direction.

In addition, the diameter of the first distribution hole 24 formed to communicate the first section 25 of the outer passage 20 and the first inner passage 22 formed on the inner surface of the third sliding groove 17 is: It is smaller than the diameter of the second distribution hole 26 formed to communicate the second section 27 of the outer passage 20 and the first inner passage 22 formed on the inner surface of the third sliding groove 17.

Therefore, the suction force of the suction means installed outside the knife gate valve A is reduced by the suction block (B) by the difference in the cross-sectional area of the first and second sections 25 and 27 and the diameter difference of the first and second distribution holes 24 and 26. It may be provided evenly distributed into the third sliding groove 17 of 18, 18a.

As shown in FIG. 3, a flow rate of a transfer material such as ash sucked from the pipe 11 into the stuffing box 19 passes between the surface of the disk 13 and the third sliding groove 17 of the suction block 18. Compared to V1, the flow rate V2 passing through the first inner passage 22 formed on the inner surface of the third sliding groove 17 becomes relatively slow (V1> V2).

In addition, the transport material passing through the third sliding groove 17 of the suction block 18 is compared with the flow rate V3 passing between the surface of the disk 13 and the third sliding groove 17 of the suction block 18a. The flow rate V4 passing through the first inner passage 22 formed on the inner surface of the third sliding groove 17 of the suction block 18a becomes relatively slow (V3> V4).

Accordingly, the suction block 18 and 18a is provided with a pressure containing a conveying material that passes from the pipe 11 to the suction packing 18 through the gap between the suction blocks 18 and 18a and the surface of the disc 13. The pressure can be reduced by the first and second inner passages 22 and 23 formed.

Thus, the air pressure contained in the conveying material such as ash conveyed along the pipe 11 may be prevented from being supplied to the airtight packing 28 through the suction blocks 18 and 18a.

That is, when the air pressure including the transport material sucked into the stuffing box 19 passes through the suction blocks 18 and 18a, the pressure is reduced and supplied toward the airtight packing 28.

Therefore, when the air pressure containing the conveying material conveyed along the pipe 11 reaches the hermetic packing 28, it can be relatively reduced in pressure to prevent leakage through the hermetic packing 28. Thereby, the airtightness by the airtight packing 28 which wraps and supports the disk 13 surface can be improved.

In addition, by providing suction pressure to the suction blocks 18 and 18a, the suction blocks 18 and 18a formed of an elastic body that adheres to the surface of the disk 13 adhere to the surface of the disk 13 and serve as packings. 13) The clearance between the surface and the suction blocks 18 and 18a can be made more airtight.

As in Figure 10, the suction block of the present specification

The airtight packing 28 and the pressure reducing suction blocks 18 and 18a are replaceably accommodated in the upper and lower portions of the stuffing box 19, and the cylinder rods 50 are stacked by the stacked airtight packing 28. The gap between the cylinders can be sealed and the pressure supplied to the end of the cylinder rod 50 can be blocked by the inner passage 60 formed to face the stacked inner side of the suction blocks 18 and 18a. It can be applied to the cylinder rod.

At this time, the pressure supplied to the airtight packing 28 by the inner passage 60 formed in the suction blocks 18 and 18a is reduced, and the airtight packing 28 is sealed between the rods 50. 9 is substantially the same as the suction blocks 18 and 18a and the airtight packing 28 provided in the knife gate valve shown in FIG. 9, and thus detailed descriptions thereof will be omitted.

Herein, while the foregoing specification has been described with reference to preferred embodiments, those skilled in the art may variously modify and modify the present disclosure without departing from the spirit and scope of the present disclosure as set forth in the claims below. It will be appreciated that this can be changed.

10; First Sliding Groove
11; pipe
12; Body
13; Disk
14; 2nd sliding groove
15; Suction hole
16; cap
17; 3rd sliding groove
18; Suction block
19; Modular Stopping Box
20; Outer passage
21; Distribution ball
22; First inner passage
23; 2nd inner passage
24; 1st distribution hole
25; Section 1
26; 2nd distribution hole
27; Second section
28; Airtight packing
29; 4th sliding groove
30; Transfer material re-entry hole
31; Conveying groove
32; Exhaust groove
33; Sealing Packing
34; packing

Claims (9)

A body having a pipe connected to the openings formed at both sides thereof and having a first sliding groove formed therein so as to communicate with the opening;
A disk coupled to the first sliding groove so as to be opened and closed to open and close the opening;
A cap mounted on the body and having a second sliding groove formed therethrough so that the disk is lifted and raised;
It is provided on the upper surface of the body and provided with a suction block is formed through the third sliding groove so that the disk is elevated,
A knife gate valve formed on an inner side surface of the third sliding groove, and having an inner passage for reducing pressure when a pressure formed in the pipe passes through a gap between the disk surface and the third sliding groove. . The method of claim 1,
Modular stuffing box in which the suction block is replaceably accommodated in the inner space and detachably mounted on the flange of the body, and suction holes for detaching and sucking the transport material remaining on the disk surface are formed through the sides. Knife gate valve characterized in that it further comprises. The method of claim 2,
The suction block is
An outer passage formed on one side of the suction block so as to communicate with the suction hole, and configured to disperse the transport material sucked through the suction hole;
One or more distribution holes for communicating the outer passage and the third sliding groove;
A first inner passage formed at an arbitrary depth on one side of an inner surface of the third sliding groove to communicate with the distribution hole;
And a second inner passage formed at a depth lower than a depth of the first inner passage at the other side of the inner side of the third sliding groove so as to face the first inner passage. The method of claim 3,
When the suction block is composed of the first and second suction blocks are stacked and installed,
The first and second suction blocks in which the outer passage, the distribution hole and the first and second inner passages are formed are symmetrically disposed in the front-rear direction with respect to the third sliding groove. The method according to claim 3 or 4,
The outer passage is
A portion facing the suction hole is formed to have a first width in a vertical direction, and includes a first section in which at least one first distribution hole is formed;
And a second section formed to communicate with the left side and the right side of the first section, and having a second width smaller than the first width and having at least one second distribution hole. The method of claim 5,
Knife gate valve, characterized in that the diameter of the first distribution hole is formed smaller than the diameter of the second distribution hole. The method of claim 1,
An inner passage formed on an inner surface of the stuffing box to communicate with the suction hole;
And a distribution hole formed through the suction block so as to communicate with the third sliding groove of the suction block and the inner passage of the stuffing box. The method of claim 2,
It is formed to be in communication with the inside on one side of the stuffing box, when the transfer material leaked from the pipe through any pipe through the conveying groove formed on the outer surface of the suction block for the re-introduction into the pipe Knife gate valve further comprises a; material re-inlet hole. The method of claim 2,
When a plurality of suction holes are formed in both sides of the stuffing box in the vertical direction,
Distributing hole for communicating the suction hole and the third sliding groove is formed through the suction block knife gate valve.

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