KR20090094785A - Knife gate valve - Google Patents

Abstract

A knife gate valve is provided to reduce the cost for maintenance and repair by allowing the valve bodies to be disassembled in part and reassembled after repair. A knife gate valve comprises a valve body(10) having a structure in which an upper valve body(15a,15b) and a lower valve body(16a,16b) are combined. The upper and lower valve bodies are joined by bolts to be separable in the vertical direction. Each of the upper and lower valve bodies is divided into two in the horizontal directions. The valve body is equipped with one or more air spray nozzles(17) which removes transferred material from the contact area between the valve body and a disc(12).

Description

Knife gate valve

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knife gate valve, and more particularly, to a knife gate valve installed in a pipe for transporting a fluid such as pulverized coal, various powdered powders, etc. in a thermal power plant and controlling a transfer amount of a fluid transferred through the pipe.

Generally, the knife gate valve is a device that is connected between the pipe and the pipe to block and open and close the flow of the fluid. Especially, the knife gate valve is a valve of the valve due to the friction and the compatibility of the fluid itself having a predetermined viscosity. If opening and closing is not easy, it is used as a means to effectively control it.

That is, the knife gate valve is used to transfer or block the transport material mixed with sludge such as wire, vinyl chips, coal burned products, such as paper mills or thermal power plants, as well as fluids, pulp and cement by controlling or opening and closing the flow path of the pipe. Used.

For example, a coal gate valve is installed in a pipe to transfer coal powder used for generating electricity in a coal-fired power plant with air and to control the amount of coal powder transported as needed.

Usually, the knife gate valve includes a valve body coupled between pipe lines, a disk inserted and moved up and down, the cylinder for moving the disk, and a sealing member that is tightly adhered to the circumference of the disk to maintain airtightness. It consists of an inclusive form.

Accordingly, when the cylinder is operated, the disk is blocked or opened while the disk is moving forward or backward, thereby controlling the amount of fluid transferred along the pipeline.

In the case of the knife gate valve, the disk is repeatedly closed and opened inside the valve body to control the fluid. At this time, the one side of the disk and the one side of the valve body are worn out by the transfer friction with the conveying object, and the effect of maintaining the airtightness of the gate decreases. have.

In other words, the long-term use of the contact surface between the valve body and the disc is worn, the play is generated, which results in loss of function without maintaining a complete airtight state, in which case the entire maintenance cost is required to replace the knife gate valve There is a problem.

In general, when the valve body is partially worn, it is preferable to raise only the worn part by welding or the like in terms of cost. However, in the case of all conventional knife gate valves, the valve body is made of one unitary structure. As a result, it is impossible to cultivate, and inevitably, the entire knife gate valve needs to be replaced.

In addition, in the case of the conventional knife gate valve, since the conveying object is a viscous fluid such as coal powder, the conveying object accumulates inside the valve body, and as a result, the airtightness of the flow path is prevented without the disk being completely adhered to the valve body side. There is a problem that maintenance and operation is not made smoothly.

Accordingly, the present invention has been made in view of this point, by combining the two bodies in a fastening structure to provide a new type of valve body capable of recombination after dismantling and partial development during maintenance, the cost associated with maintenance It is an object of the present invention to provide a knife gate valve that can greatly reduce the pressure.

In addition, the present invention has a means for injecting air into the valve body to effectively remove the transport material accumulated in the contact portion between the valve body and the disk when opening and closing the disk, thereby improving the sealing function of the disk Another object of the present invention is to provide a knife gate valve capable of smoothly opening and closing a disk.

In addition, the present invention is provided with a packing having an elastic mounting structure inside the valve body to ensure that the packing is always in close contact with the disc, to provide a knife gate valve that can maximize the sealing blocking effect of the sealing portion There is a purpose.

In order to achieve the above object, the knife gate valve provided in the present invention includes a valve body installed between the conduits, a disk inserted into the valve body to open and close the fluid passage while moving forward and backward, and a rear end side of the disk. And a cylinder which is connected to the disk to move the disk, and is installed along the edge of the fluid passage to keep the airtight in close contact with the disk, while the valve body is divided into two upper and lower valve bodies. The valve body is bolted together, and the upper valve body and the lower valve body can be separated into two left and right sides, so that the valve body can be easily dismantled during maintenance by welding or the like. It is characterized in that it can be used by recombination after fostering.

Here, the valve body is preferably provided with at least one air spray nozzle which can remove the transport material accumulated in the contact portion between the disk and the valve body by air to ensure smooth opening and closing operation and airtight performance of the disk. .

In the case of the disk, the disk body directly blocks the fluid passage of the valve body, and the disk body is configured to open the fluid passage by moving away from the fluid passage side, or the disk body directly blocks the fluid passage of the valve body. The disk hole formed in the disk body can be matched with the fluid passage to open the fluid passage.

The knife gate valve provided in the present invention has the following advantages.

① The valve body is composed of two parts that can be combined and dismantled. Therefore, the maintenance of expensive knife gate valves is possible since the valve body can be dismantled and partially reused after maintenance. Significant cost savings compared to replacement.

② By using the air spray nozzle installed inside the valve body, it is possible to completely remove the transport material such as coal accumulated or stuck in the contact area between the gate and the valve body, so that the sealing effect can be maximized. It can be done smoothly.

③ Since the packing in contact with the gate can be kept in close contact with the gate surface at all times by the force of the spring, the sealing effect of the sealing part can be secured and the competitiveness of the knife gate valve can be improved by increasing the reliability of the quality of the knife gate valve. There is an effect such as.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 are front, plan and cross-sectional views showing a knife gate valve according to an embodiment of the present invention.

As shown in Figures 1 to 3, the knife gate valve is a kind of valve device installed on the tube for conveying the fluid such as pulverized coal, various powdered powder, etc. in a thermal power plant, and controls the amount of fluid transferred through the tube It plays a role.

To this end, a valve body 10 having a fluid passage 11 is connected and installed between the tubular body and the tubular body, and a plate-shaped disk 12 serving to open and close the fluid passage 11 inside the valve body 10. ) Is installed in a slidable structure, a cylinder 13 is provided at the rear of the disk 12 to provide the opening and closing power.

In particular, the valve body 10 is composed of a structure that can be assembled and dismantled, and thus can be used by reassembling after disassembly during maintenance, take appropriate measures.

For example, the valve body 10 is composed of an upper valve body 15a, 15b and a lower valve body 16a, 16b, which are divided into two upper and lower parts, which are coupled to each other by bolting, thereby releasing bolts. When the upper valve body (15a, 15b) and the lower valve body (16a, 16b) can be separated from each other.

In addition, in each case of the upper valve body (15a, 15b) and the lower valve body (16a, 16b) is a removable form of a structure in which the left and right two are coupled by bolting, which is also separated from each other through bolt release Can be.

Here, the shape divided into two left and right sides may be two left and right forms each having a 1 / 2-circular fluid passage.

Accordingly, the valve body 10 can be properly disassembled into two or four parts as necessary during maintenance.

Since the valve body 10 can be dismantled and reassembled in this way, it is possible to facilitate the fostering work such as welding to the worn part in the disassembled state, and thus it can be reused as described above. The inefficient face of replacing the entire knife gate valve including the valve body can be eliminated.

In addition, the disk 12 is installed side by side inside the valve body 10, that is, is installed side by side with the body body between the upper valve body (15a, 15b) and the lower valve body (16a, 16b), In this state of installation and moving back and forth serves to open and close the fluid passage 11 of the valve body (10).

For example, the fluid path 11 of the valve body 10 is directly blocked by its own disc body, or the disc body itself, which is blocking the fluid path 11, is released from the fluid path 11 side. ) To open the door.

The disk 12 is connected to the cylinder 13 side and the rod 19 to serve to open and close the fluid passage 11 of the valve body 10 while moving back and forth during cylinder operation.

For example, one side of the valve body 10 is coupled to the casing 22 side by side in a straight line, and at this time the inside of the casing 22 is provided with a rod 19 that can slide back and forth, and the rod 19 ) Is connected in the form of hooking the hole part at the rear end of the disk 12 by using the hook 20 at the front end and at the same time the rear end is connected to the cylinder 13 side, so that the rod 19 during cylinder operation is The entire containing disk 12 can be moved back and forth, so that the fluid passage 11 of the valve body 10 can be opened or blocked depending on the position of the disk 12.

Here, the connection structure between the disk and the rod using the hook locking action provides an advantage of facilitating the work of disassembling or reassembling the disk when disassembling the valve body.

In particular, the present invention provides a means for neatly removing the conveying object accumulated or pinched in the fluid passage 11 of the valve body (10).

To this end, two air spray nozzles 17 facing each other are mounted on one side of the valve body 10, for example, an edge surface of the fluid passage 11 that contacts the disk 12. At this time, the air injection nozzle 17 is connected to the air line extending from the external air source unit 25.

Accordingly, the compressed air injected from the air spray nozzle 17 drops the conveying object attached to the wall while strongly hitting not only the periphery of the passage surface where the disc 12 contacts, but also the valve body 10. ) And a clean contact surface between the disk 12 can be secured and the sealing effect can be enhanced.

In addition, in the present invention, by providing a predetermined packing 14 along the periphery peripheral surface of the disk 12 which is blocking the fluid passage 11, it provides a gas tight system that can achieve a perfect sealing blocking effect.

To this end, the packing 14 is a fixed packing 14a mounted to the upper valve bodies 15a and 15b and an elastic packing 14b mounted to the lower valve bodies 16a and 16b while taking the ring shape as a whole. Is done.

In the case of the fixed packing (14a) is mounted in the form fitted along the periphery of the edge portion of the fluid passage 11 of the upper valve body (15a, 15b), in the case of the resilient packing (14b) It is mounted in the form of being inserted together with the spring 18 on the bottom in the spring mounting groove 24 provided along the circumference of the edge portion of the fluid passage 11 of the body (16a, 16b).

Accordingly, the elastic packing 14b can press the disk 12 toward the fixed packing 14a while maintaining the state in which the elastic packing 14b is always in close contact with the disk 12 under the force of the spring 18, and eventually the disk 12 Since both sides of the can be compressed between the fixed packing (14a) and the elastic packing (14b), the circumference of the edge of the fluid passage 11, which is blocked by the disk 12 can be completely sealed.

4 to 6 are front, plan and cross-sectional views showing a knife gate valve according to another embodiment of the present invention.

4 to 6, the embodiment provided herein differs only in the form of the disk 12, the connection structure with the cylinder 13 side, and the method of opening and closing the fluid passage 11, the rest of which is different. Is substantially the same as the above embodiment.

That is, the valve body 10 is also composed of the upper valve body (15a, 15b) and the lower valve body (16a, 16b) of the form that can be disassembled and recombined for easy maintenance, and the valve body 10 is compressed An air spray nozzle 17 for injecting air is provided, and in the case of the packing 14, all of the packing 14 is applied to the elastic packing 14b instead of the fixed packing 14a.

The disk 12 is formed of a rectangular disk-shaped disk body, the disk body is provided with a disk hole 21 corresponding to the size of the fluid passage (11).

Accordingly, in the case of the disk 12, the fluid passage 11 of the valve body 10 is directly blocked by the disc body, or the disc hole 21 formed in the disc body coincides with the fluid passage 11 to allow the fluid to flow. The opening and closing method of opening the passage 11 is provided.

In addition, the disk 12 is connected to the structure in which the rear end thereof is directly fastened to the cylinder 13 side through the connector 23, and thus can be positioned in the open state or the closed state while sliding the cylinder back and forth during the operation of the cylinder. do.

Therefore, looking at the operating state of the knife gate valve according to an embodiment of the present invention configured as described above are as follows.

7 is a cross-sectional view showing an operating state of a knife gate valve according to an embodiment of the present invention.

As shown in FIG. 7, first, the valve body 10 of a knife gate valve is installed in the conveyance piping (not shown) which comprises a thermal power plant system.

In this state of installation, the amount of coal powder transferred through the transfer pipe by the system of the thermal power plant is controlled. At this time, the cylinder 13 constituting the knife gate valve is operated.

Then, while the fluid passage 11 of the valve body 10 is opened or blocked according to the position of the disk 12 moving in accordance with the cylinder operation, the amount of coal powder is adjusted.

At this time, when the disc 12 is closed in order to block the transfer of coal powder transported along the conveying pipe, the fluid passage 11 which comes into contact with the tip portion of the disc 12 by operating the air spray nozzle 17 in advance. By removing the coal dust adhering to the edge surface of the disk, reliable contact of the disk 12 can be maintained, and the fluid passage is provided by the fixed packing 14a and the elastic packing 14b when the disk 12 is closed. Since the edge portion of the disk 12 in contact with the periphery of the edge surface of 11 can be completely blocked, it is possible to maintain a secure sealed state of the fluid passage 11.

In particular, in the case of maintenance during wear due to long-term use of the knife gate valve, the valve body 10 can be properly dismantled from two parts to four parts, and then the worn part can be easily raised and repaired by welding or the like. Therefore, there is an advantage that can be used again without replacing the knife gate valve with a new one as before.

Knife gate valves as described above can be used in a comprehensive way to control or block the transfer amount while transferring fine powder such as cement, sand as well as coal powder used in thermal power plants.

1 is a front view showing a knife gate valve according to an embodiment of the present invention

2 is a plan view showing a knife gate valve according to an embodiment of the present invention

3 is a cross-sectional view showing a knife gate valve according to an embodiment of the present invention

4 is a front view showing a knife gate valve according to another embodiment of the present invention

5 is a plan view showing a knife gate valve according to another embodiment of the present invention

6 is a cross-sectional view showing a knife gate valve according to another embodiment of the present invention

Figure 7 is a cross-sectional view showing the operating state of the knife gate valve according to an embodiment of the present invention

<Description of the symbols for the main parts of the drawings>

10: valve body 11: fluid passage

12 disc 13 cylinder

14 packing 14a fixed packing

14b: elastic packing 15a, 15b: upper valve body

16a, 16b: lower valve body 17: air spray nozzle

18: spring 19: rod

20 hook 21 disc hole

22: casing 23: connector

24: spring loaded groove 25: air source unit

Claims (6)

A valve body 10 provided between the pipelines, a disk 12 inserted into the valve body 10 to open and close the fluid passage 11 while moving forward and backward, and a rear end side of the disk 12. A knife gate valve including a cylinder 13 connected to and moving the disk 12 and a packing 14 installed along the edge of the fluid passage 11 to be in close contact with the disk 12 side to maintain airtightness. To The valve body 10 has a structure in which the upper valve body 15a, 15b and the lower valve body 16a, 16b, which are separated into two upper and lower parts, are bolted together, and the upper valve body 15a, 15b Knife gate valve, characterized in that each of the lower valve bodies (16a, 16b) is also separated into two left and right. The valve body (10) according to claim 1, wherein the valve body (10) is provided with at least one air spray nozzle (17) capable of blowing off the transport material accumulated in the contact area between the disk (12) and the valve body (10) by air. Knife gate valve. 3. The packing according to claim 1 or 2, wherein the packing (14) consists of a fixed packing (14a) mounted on the upper valve bodies (15a, 15b) and an elastic packing (14b) mounted on the lower valve bodies (16a, 16b). And the resilient packing (14b) is supported by a spring (18) to always be in close contact with the disc side. 3. The packing according to claim 1 or 2, wherein the packing (14) consists of an elastic packing (14b) mounted to the upper valve body (15a, 15b) and the lower valve body (16a, 16b), respectively. 14b) is a knife gate valve, characterized in that supported by the spring (18) to always be in close contact with the disc side. 2. Knife gate valve according to claim 1 or 1, characterized in that the disc (12) is connected in a detachable structure to the tip hook (20) of the rod (19) extending from the cylinder (13) side. 3. The disk 12 according to claim 1 or 2, wherein the disk 12 blocks the fluid passage 11 of the valve body 10 directly with the disc body and moves the disk body away from the fluid passage 11 side. The fluid passage 11 may be formed in an open form, or the disc passage 21 of the valve body 10 may be directly blocked by the disc body, and the disc hole 21 formed in the disc body may coincide with the fluid passage 11. 11) knife gate valve, characterized in that the form of opening.

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