CN110805710A

CN110805710A - Medium zero-leakage gate valve sealed by air plug

Info

Publication number: CN110805710A
Application number: CN201911212051.XA
Authority: CN
Inventors: 肖安俊; 方中旺
Original assignee: Hubei Jing Sheng Machinery And Equipment Manufacturing Ltd By Share Ltd
Current assignee: Hubei Jing Sheng Machinery And Equipment Manufacturing Ltd By Share Ltd
Priority date: 2019-12-02
Filing date: 2019-12-02
Publication date: 2020-02-18

Abstract

The invention provides a medium zero-leakage gate valve sealed by a gas plug. The gas plug gas filling pipe and the end flange are arranged on a valve body of the gate valve, the inspection door is arranged on the valve body, an annular sealing air passage is arranged on the periphery of the inner smoke outlet side of the valve body, the gate is arranged in the valve body, a driving block is fixedly arranged at the end part of the gate and connected with a driving piece, a supporting bearing is arranged at the part of the driving piece, which penetrates out of the end flange, and the other end of the driving piece is connected with a driving. The contact part of the annular sealing air passage and the plane of the inserting plate is an opening and is communicated with an external pressurized air plug air filling pipe. The gate valve is sealed by adopting compressed air, the materials are all materials suitable for working conditions and are not limited by weather resistance, so that the practicability is high, the production cost is reduced, the investment of equipment can be reduced, and the application is wider.

Description

Medium zero-leakage gate valve sealed by air plug

Technical Field

The invention relates to the field of valves and gate valves, in particular to a medium zero-leakage gate valve sealed by a gas plug.

Background requirements

The smoke is inevitably generated in places where heat energy conversion is needed in the production process of industrial enterprises, and the removal of nitrogen and sulfur oxides contained in the smoke and damaging the atmospheric environment is an indispensable technological requirement, so that valve equipment for controlling the orderly emission of the smoke becomes an indispensable product in the production link, and the working performance of the valve is also the key for the quality of the smoke treatment process. It is known that nitrogen and sulfur oxide flue gas has strong corrosivity, and the flue gas is usually accompanied by a certain temperature, and in addition, the pressure of the flue gas is generally low, mostly several kilopascals, and the discharge pipeline drift diameter is generally large.

At present, under the working condition, a butterfly baffle door and a double-sealing shutter baffle door are basically adopted in the prior art. The butterfly baffle valve is mainly used for controlling the flow of flue gas, and is used in occasions where the flue gas is not required to be cut off, and the double-seal shutter baffle door is used in the working condition where the flue gas is required to be cut off. The double-layer butterfly plate 16 in the double-sealing shutter baffle door in the prior art has two sealing surfaces of a butterfly plate front sealing surface 19 and a butterfly plate rear sealing surface 20, an annular air passage 10 which can be introduced with compressed air is formed between the two sealing surfaces 19 and 20, the pressure of the compressed air in the annular air passage 10 is higher than the pressure of smoke to be controlled, and the pressure can make a sealing elastic sheet 21 arranged on the double-layer butterfly plate 16 contact a sealing valve seat 22 on a valve body 2, so that a sealing air plug is established, smoke is prevented from passing through the double-layer butterfly plate 16, and zero leakage of the smoke is completed (see figures 6-8). Although the double-sealing shutter door is accepted by the market in the application of zero leakage of smoke, due to the structural requirement of the double-sealing shutter door, a dynamic interface and a static interface exist at the positions of the driving shaft 15 and the rear shaft 17, therefore, the sealing clearance is difficult to control, and particularly in the occasions with complicated smoke discharge working conditions, a fan with high-power compressed air is required to be arranged to ensure that an air plug established by the fan has sufficient pressure, and the operation cost is high due to the large power of the arranged fan. Moreover, the two sealing surfaces 19 and 20 in the double-sealing shutter door need to simultaneously meet the requirement of good contact with the two sealing valve seats 22, so that a sealing air plug can be well established, and the manufacturing requirement of the structural design has certain difficulty, otherwise, the air quantity of the sealing compression fan needs to be increased to make up. The baffle door has larger investment, larger weight and size, and is used in Hangzhou mountain power plants and Lopa Huang power plants at present (see the design of a flue gas desulfurization baffle for reference).

The utility model discloses a patent for 201720794797.6 patent name is push-pull valve's utility model patent (the invention was applied for simultaneously), and this push-pull valve is through exerting external force (the thrust of straight stroke cylinder) mode at the picture peg plane (corresponding seal receptacle position), exerts sealing force for the sealed face of flashboard, makes the sealed specific pressure that cuts the flue gas needs realize. The gate valve has the problems of multiple storage in design and manufacture, and the reliability of the gate valve is difficult to control. The reason is as follows: 1. because the structural design of the valve is given before the valve is produced and manufactured, the structural design is difficult to keep consistent with the stability of the working condition on site, namely the designed working condition parameters are difficult to be completely the same as the actual working condition, so that the working effect of the valve is difficult to ensure. 2. The structure is too complicated, a plurality of pressurizing air cylinders are arranged at the parts of the inserting plates corresponding to the inserting plate sealing seats, and the arrangement positions of the air cylinders are consistent with the working condition deformation requirements of the inserting plates, so that the control is impossible, and the unreliable operation of the valve can be caused. 3. The surface roughness of the insert plate sealing surface has a great influence on the sealing performance, and higher production and manufacturing costs are also required to meet the requirement.

The patent number 201711471384.5 discloses an invention patent of a gate valve, which is mainly technically characterized in that: through setting up the valve plate seal chamber of sealing up the isolation with the valve pocket, when opening the push-pull valve, the valve plate moves to the valve plate seal chamber from the valve pocket, and when the sealing connection of valve plate and baffle was damaged, the dust can get into the valve plate seal chamber, because the valve plate seal chamber is sealed, then has avoided the dust in the valve pocket to spill the valve body, has improved sealing reliability. Therefore, the gate valve only solves the problems of reporting and protecting the valve rod and sealing the valve outwards, and cannot effectively prevent the problem of internal leakage of smoke.

Disclosure of the invention

The invention aims to provide a medium zero-leakage gate valve sealed by a gas plug. The invention aims to solve the technical problem that the gas introduced into a sealed air passage is utilized to form an air plug on the sealing surface of a gate valve to prevent the smoke needing to be cut off from passing through the sealing surface, thereby achieving the aim of realizing zero leakage of a medium and facilitating the maintenance of equipment at the downstream of the gate valve.

The design idea of the invention is mainly realized by the following points: 1. the outlet side of the flue gate valve is provided with an air passage which can be filled with compressed air, the end surface of the opening side of the air passage is simultaneously contacted with the sealing surface of the gate with the valve body sealing seat on the outlet side of the valve body, and the rest of the air passage is completely sealed. 2. The contact surface of the insertion plate and the valve seat is a plane with a certain inclination so as to ensure that the insertion plate and the valve seat are well contacted when closed, and the gap is increased when opened, so that the operation of the insertion plate is flexible, and the problem of gap control of the sealing surface of the insertion plate and the valve seat is not considered. 3. Because the contact of the inserting plate and the valve seat of the valve body is along the direction of the channel of the valve body, the rigidity of the valve body in the direction is very high, and the deformation problem in the direction does not exist, so the sealing effect is controllable during the production of the valve. 4. The air flue adopts the structure that the upper surface is wide, the lower surface is narrow, and the opening is small, so that an air plug is easily established to form air pressure and block smoke from passing through a sealing surface; meanwhile, because the opening is small, the sealing surface of the insert plate is in perfect contact with the valve seat, so that the loss of compressed air is less, a fan with high power is not required to be configured, and the operating cost is low. 5. Because the compressed air is adopted for sealing, other materials are materials suitable for the working condition, the influence of temperature change can not be caused, and the weather resistance limitation is avoided, so that the practicability is high. 6. Because the gap between the inserting plate and the valve seat does not need to be controlled, the plane precision of the inserting plate can be properly reduced, the production cost can be reduced, the equipment investment can be reduced, and the application is wider. 7. The driving mechanism can be configured according to the requirements of field configuration, and the driving mode can be realized by a push rod, a screw rod, a chain wheel and the like.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a dielectric zero-leakage gate valve sealed with a plug, comprising: the gas plug gas filling pipe, the valve body, the picture peg, driving piece, drive block, access door, end flange, support bearing, actuating mechanism and annular seal air flue, be equipped with gas plug gas filling pipe and end flange on the valve body of push-pull valve and be provided with the inspection door, the inside flue gas outlet side periphery of valve body is provided with annular seal air flue, is equipped with the picture peg in the valve body, and the tip of picture peg is equipped with the drive block admittedly, and the drive block is connected with the driving piece, and the end flange position is worn out to the driving piece and is equipped with support bearing, and the other end of.

The contact part of the annular sealing air passage arranged in the gate valve and the plane of the gate is in an open state and is communicated with an air plug air filling pipe pressurized from the outside.

The driving mechanism in the gate valve drives the gate to do reciprocating motion in a manner of telescopic push rod driving, screw rod driving, chain wheel and chain driving or other driving manners.

Compared with the prior art, the invention has the following positive effects:

1. the outlet side of the flue gate valve is provided with an air passage into which compressed air can be introduced, the end surface of the opening side of the air passage and the valve body sealing seat on the outlet side of the valve body are simultaneously contacted with the sealing surface of the gate, and the rest of the air passage is completely sealed;

2. the contact surface of the insert plate and the valve seat in the insert plate valve adopts a plane with a certain inclination to ensure that the insert plate and the valve seat are well contacted when closed, and the gap is increased when opened, so that the operation of the insert plate is flexible without considering the gap control problem of the seal surface of the insert plate and the valve seat;

3. the contact between the inserting plate and the valve seat of the valve body is along the direction of the channel of the valve body, the rigidity of the valve body in the direction is very high, and the problem of deformation in the direction is solved, so that the sealing effect is controllable during valve production;

4. the annular sealing air passage in the gate valve is wide at the upper part, narrow at the lower part and small in opening, so that an air plug is easy to establish to form air pressure and block smoke from passing through a sealing surface; meanwhile, because the opening is small, the sealing surface of the insert plate is in perfect contact with the valve seat, so that the loss of compressed air is little, a fan with high power is not required to be configured, and the operating cost is low;

5. the gate valve is sealed by adopting compressed air, and other materials are suitable for working conditions, so that the gate valve is not influenced by temperature change and is not limited by weather resistance, and therefore, the gate valve is high in practicability;

6. the gate valve does not need to control the gap between the gate and the valve seat, so that the plane precision of the gate can be properly reduced, the production cost can be reduced, the equipment investment can be reduced, and the application is wider;

7. the configuration of the driving mechanism can be completely carried out according to the requirements of field configuration, and the driving mode can be realized by using a telescopic push rod for driving, a screw rod for driving, a chain wheel for driving or other modes for driving.

Drawings

FIG. 1 is a schematic diagram of a valve opening structure of a medium zero-leakage flashboard sealed by a gas plug;

FIG. 2 is a schematic view of a closing structure of a medium zero-leakage gate valve sealed by a gas plug;

FIG. 3 is a schematic top view of a dielectric zero-leakage gate valve sealed with a gas plug;

FIG. 4 is an enlarged view of a portion of a dielectric zero leakage gate valve A-A sealed with a plug;

FIG. 5 is an enlarged view of a portion of a dielectric zero leakage gate valve B-B sealed with a gas plug;

FIG. 6 is a schematic view of a prior art double-layer butterfly flapper valve configuration;

FIG. 7 is a schematic side view of a prior art double-layer butterfly flapper valve;

FIG. 8 is an enlarged partial view of a prior art double-layer butterfly flapper valve C-C.

In the figure: 1. the gas plug air filling pipe comprises a gas plug air filling pipe body, 2, a valve body, 3, an inserting plate, 4, a driving piece, 5, a driving block, 6, an access door, 7, an end flange, 8, a supporting bearing, 9, a driving mechanism, 10 annular sealing air passages, 11, a sealing air source inlet, 12, a smoke outlet, 13, a smoke inlet, 14, a gas plug sealing part, 15, a driving shaft, 16, a double-layer disc plate, 17 rear shafts, 18, an air inlet valve, 19, a disc plate front sealing surface, 20, a disc plate rear sealing surface, 21, a sealing elastic sheet, 22, a sealing valve seat, 23 and a synchronous operation mechanism.

Detailed Description

The technical solution of the present invention will be further clearly and completely described below with reference to the accompanying drawings and examples.

Referring to the attached drawings 1-5, an air plug air filling pipe 1 and an end flange 7 are arranged on a valve body 2 of the gate valve, an inspection door 6 is arranged on the valve body, an annular sealed air passage 10 is arranged on the periphery of an inner flue gas outlet side of the valve body 2, an inserting plate 3 is arranged in the valve body 2, a driving block 5 is fixedly arranged at the end part of the inserting plate 3, the driving block 5 is connected with a driving piece 4, a supporting bearing 8 is arranged at the position, penetrating out of the end flange 7, of the driving piece 4, and the other end of.

The contact part of an annular sealing air passage 10 arranged in the gate valve and the plane of the gate is in an open state and is communicated with an external pressurized air plug air filling pipe 1.

The driving mechanism 9 in the gate valve drives the gate 3 to do reciprocating motion in a manner of telescopic push rod driving, screw rod driving, chain wheel and chain driving or other driving manners.

When the flashboard valve is opened, the driving mechanism 9 drives the driving part 4 which is arranged on the supporting bearing 8 and penetrates through the end flange 7 to rotate, the driving block 5 arranged on the driving part 4 drives the flashboard 3 arranged in the valve body 2 to move rightwards, the flashboard valve is opened, and smoke enters from the smoke inlet 13 and is discharged from the smoke outlet 12. At the moment, the valve on the air plug air filling pipe 1 arranged on the valve body 2 is closed, the annular sealing air passage 10 does not form the air plug, and the complete discharge of the flue gas in the flue can be realized.

When the gate valve needs to be closed, the driving mechanism 9 drives the driving part 4 to rotate in the opposite direction when the gate valve is opened, the driving block 5 on the driving part 4 drives the gate 3 arranged in the valve body 2 to move leftwards, and when the gate 3 moves to the end position, the gate 3 completely cuts off the smoke inlet and outlet channel in the valve body 2, so that the gate valve is in a cut-off state. At the moment, a valve on the air plug gas filling pipe 1 is opened, and the gas enters from the sealing gas source inlet 11 and enters the annular sealing gas passage 10 through the air plug gas filling pipe 1, so that the gas in the annular sealing gas passage 10 forms a sealing air plug at the air plug sealing part 14 of the annular sealing gas passage 10 and the inserting plate 3. When the pressure of the air plug is higher than the smoke exhaust pressure in the flue, the smoke in the flue is completely blocked by the air plug and cannot pass through, and zero leakage of smoke media is realized. And an access door 6 arranged on the gate valve is used for overhauling and replacing parts of the gate valve and cleaning smoke.

All features disclosed in this specification, or all combinations of parts and mounting locations disclosed, may be combined in any desired manner, except in combinations and/or steps which are mutually exclusive. Any feature disclosed in this specification (including any accompanying claims and abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.

The above description is only a non-limiting embodiment of the present invention, and many embodiments can be derived, and it will be apparent to those skilled in the art that many modifications and improvements can be made without departing from the inventive concept and without making creative efforts, and these embodiments are all within the protection scope of the present invention.

Claims

1. A dielectric zero-leakage gate valve sealed with a plug, comprising: air lock gas filling pipe (1), valve body (2), picture peg (3), driving piece (4), drive block (5), access door (6), end flange (7), support bearing (8), actuating mechanism (9) and annular seal air flue (10), its characterized in that: the gas plug air-filling pipe (1) and the end flange (7) are arranged on a valve body (2) of the gate valve, an inspection door (6) is arranged on the valve body, an annular sealing air passage (10) is arranged on the periphery of the inner smoke outlet side of the valve body (2), a gate (3) is arranged in the valve body (2), a driving block (5) is fixedly arranged at the end part of the gate (3), the driving block (5) is connected with a driving piece (4), a supporting bearing (8) is arranged at the position, penetrating out of the end flange (7), of the driving piece (4), and the other end of the driving piece (4) is connected with a.

2. The zero-leakage-media gate valve sealed with a plug according to claim 1, wherein: the contact part of an annular sealing air passage (10) arranged in the gate valve and the plane of the gate is in an open state and is communicated with an external pressurized air plug air filling pipe (1).

3. The zero-leakage-media gate valve sealed with a plug according to claim 1, wherein: the driving mechanism (9) in the gate valve drives the gate (3) to do reciprocating motion in a manner of telescopic push rod driving, screw rod driving and chain wheel and chain driving.