CN110848447B - Pneumatic active explosion-proof gate valve and explosion-proof method - Google Patents
Pneumatic active explosion-proof gate valve and explosion-proof method Download PDFInfo
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- CN110848447B CN110848447B CN201911283042.XA CN201911283042A CN110848447B CN 110848447 B CN110848447 B CN 110848447B CN 201911283042 A CN201911283042 A CN 201911283042A CN 110848447 B CN110848447 B CN 110848447B
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- air chamber
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- chamber cavity
- explosion
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000004880 explosion Methods 0.000 claims abstract description 24
- 239000000428 dust Substances 0.000 claims abstract description 17
- 230000001629 suppression Effects 0.000 claims abstract description 9
- 230000008859 change Effects 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims description 22
- 230000004044 response Effects 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 5
- 239000011261 inert gas Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 6
- 238000011144 upstream manufacturing Methods 0.000 abstract description 5
- 230000002457 bidirectional effect Effects 0.000 abstract description 4
- 230000007480 spreading Effects 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 abstract 1
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/18—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on either side
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0025—Electrical or magnetic means
- F16K37/005—Electrical or magnetic means for measuring fluid parameters
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
- Sliding Valves (AREA)
Abstract
The invention relates to a pneumatic active explosion-proof gate valve and an explosion-proof method, wherein the gate valve comprises a valve body, a movable gate plate, an air supply device, an air cylinder, a controller and a differential pressure sensor, the valve body comprises an upstream flange, a downstream flange and a valve cavity, a groove is formed in the valve cavity, and the movable gate plate slides up and down in the groove; the differential pressure sensor is arranged on the dust removing air pipes at the two sides of the valve body; the cylinder is arranged at the top of the valve body and is divided into an upper air chamber cavity and a lower air chamber cavity by the piston, the upper air chamber cavity and the lower air chamber cavity are communicated with the air supply device, and the movable plugboard is welded on the plugboard connecting rod; the upper air chamber cavity and the lower air chamber cavity are respectively welded with an upper air chamber cavity air outlet valve and a lower air chamber cavity air outlet valve; the controller is electrically connected with the differential pressure sensor, the electromagnetic valve and the air supply device. According to the invention, the pressure difference sensor is used for monitoring the pressure difference change at two sides of the valve body, any side of the valve body can be used for actively and effectively closing the plugboard when explosion occurs, the explosion is prevented from spreading to the other end, the process air flow is not influenced, and active bidirectional explosion suppression can be realized.
Description
Technical Field
The invention belongs to the technical field of dust explosion suppression devices, and particularly relates to a pneumatic active explosion suppression gate valve and an explosion suppression method.
Background
In recent years, dust explosion accidents of powder-related enterprises are frequent, and prevention of dust explosion and reduction of dust explosion hazard are primary measures of governments, emergency management departments and powder-related enterprises. At present, in order to reduce the influence of dust explosion, a common means is to isolate the explosion, and a flap explosion-proof valve is adopted at present, but the flap explosion-proof valve can only isolate the explosion generated by one side, and the floating ball type bidirectional explosion-proof valve can seriously influence the process air flow.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the pneumatic active explosion-proof gate valve and the explosion-proof method, wherein the pressure difference change of two sides of the movable gate valve is monitored through the pressure difference sensor, the gate can be actively and effectively closed when any side of the movable gate valve explodes, the explosion is prevented from spreading to the other end, the process air flow is not influenced, and the active bidirectional explosion-proof and rapid and stable action can be realized.
The pneumatic active explosion-proof gate valve comprises a valve body, a movable gate plate, an air supply device, an air cylinder, a controller and a differential pressure sensor, wherein the valve body comprises an upstream flange, a downstream flange and a valve cavity; the differential pressure sensor is arranged on the dust removing air pipes at the two sides of the valve body; the movable plugboard is welded in the lower air chamber cavity of the air cylinder and connected to a plugboard connecting rod on the piston; the pressure-resistant pipe fitting for the air supply device is respectively communicated with an upper air chamber cavity air inlet and a lower air chamber cavity air inlet of the air cylinder through electromagnetic valves, and the upper air chamber cavity and the lower air chamber cavity are respectively welded with an upper air chamber cavity air outlet valve and a lower air chamber cavity air outlet valve; the controller is electrically connected with the differential pressure sensor, the electromagnetic valve and the air supply device; the piston moves up and down due to the air pressure change in the upper air chamber cavity and the lower air chamber cavity, and drives the movable flashboard to slide up and down, so that the switching of the opening and closing states of the flashboard valve is realized.
The distance between the differential pressure sensor and the movable plugboard is determined according to the wind speed and the plugboard response time of the actual working condition, the response time of the plugboard valve under different working conditions is different, the response time of the plugboard valve applied to the dust removing air pipes with different cross sections is also different, and the actual installation distance of the sensor is also different.
The cross-sectional area of the movable plugboard is larger than that of the dedusting air pipe.
Sealing rubber is distributed on the surface of the groove, so that the movable valve plate and the dust removal pipeline are sealed, and the movable plugboard and the valve body are sealed.
The air supply device is a compressed air bottle, and inert gas is arranged in the air supply device.
The upper air chamber cavity air outlet valve and the lower air chamber cavity air outlet valve comprise sleeves welded on the air cylinder, sealing rubber plugs and bolts, the sealing rubber plugs are in interference fit inside the sleeves, and the ends of the sleeves are locked by the bolts to ensure the sealing of the air chamber cavities.
The movable plugboard can be square or round, and can be used for pipelines with different shapes respectively.
The explosion-proof method of the pneumatic active explosion-proof gate valve comprises the following steps of: when the pressure difference sensor at any side detects a signal exceeding the pressure threshold, the controller sends a signal to the electromagnetic valve connected with the air supply device and the upper air chamber, the air supply device inflates the upper air chamber, the air pressure of the two air chamber changes to enable the piston in the air cylinder to move downwards, the air pressure of the lower air chamber drives the bolt and the sealing rubber plug to flush out of the sleeve to deflate, and the piston drives the movable plug board to move downwards to realize closing of the plug board.
The beneficial effects of the invention are as follows: the invention uses the inflation and deflation of the upper and lower air chamber cavities to change the position of the piston in the air cylinder, thereby ensuring the normal working state of the gate valve and timely closing action when explosion is prevented; compared with the existing products, the invention has the advantages that: (1) The sensor can detect the explosion condition of any side of the dust removal air pipe, and the aim of bidirectional explosion suppression can be effectively achieved; (2) The pressure difference is transmitted to the controller through the sensor, and the controller sends out instructions to the electromagnetic valve and the air device so as to close the gate valve, so that the effect of active explosion suppression can be realized; (3) The invention has simple structure, rapid reaction and stable explosion-proof performance.
Drawings
FIG. 1 is a schematic view of a use state of the present invention according to an embodiment;
FIG. 2 is a schematic diagram of the internal structure of the upper and lower air chamber outlet valves of the present invention;
FIG. 3 is a schematic view of the gate valve of the present invention in an open state;
FIG. 4 is a schematic diagram of a half-open state of the gate valve in the closing process of the present invention;
FIG. 5 is a schematic view of the gate valve in the closed state of the present invention;
wherein,
the device comprises an upper air chamber cavity air inlet, a lower air chamber cavity air inlet, a movable plugboard 3, a plugboard connecting rod 4, a valve body 5, an upstream flange 6, a downstream flange 7, an 8-cylinder, a 9-groove 10 differential pressure sensor 11, a controller 12, an air supply device 13, an upper air chamber cavity air outlet valve 14, a lower air chamber cavity air outlet valve 15, a sleeve 16, a sealing rubber plug 17 and bolts.
Detailed Description
For better explanation of the present invention, for easy understanding, the technical solution and effects of the present invention will be described in detail below by way of specific embodiments with reference to the accompanying drawings.
As shown in fig. 1-5, a pneumatic active explosion-proof gate valve comprises a valve body 5, a movable gate plate 3, an air supply device 12, an air cylinder 8, a controller 11 and a differential pressure sensor 10, wherein the valve body 5 comprises an upstream flange 6, a downstream flange 7 and a valve cavity, the valve cavity comprises an upper part and a lower part which are connected between the upstream flange 6 and the downstream flange 7, a groove 9 is formed in the valve cavity, the movable gate plate 3 slides up and down in the groove 9, sealing rubber is distributed on the surface of the groove 9, and sealing between a movable valve plate and a dust removing pipeline and sealing between the movable gate plate 3 and the valve body 5 are realized; the differential pressure sensor 10 is arranged on dust removing air pipes on two sides of the valve body 5, the distance between the differential pressure sensor 10 and the movable plugboard 3 is determined according to the wind speed of the actual working condition and the plugboard response time, the plugboard response time is different under different working conditions, the actual installation distance of the sensor is also different, the plugboard response time comprises mechanical delay and electrical delay, when the mechanical delay and the electrical delay are measured, a plurality of connection indicating lamps are required to be arranged on the dust removing air pipes, the controller 11 sends out a closing instruction of the plugboard, and the time delay is calculated by analyzing frame by frame through high-speed photography video in the process of sending out the instruction to the closing of the movable plugboard 3; in this embodiment, the total delay time of the gate valve is 100ms, so the actual distance between the differential pressure sensor 10 and the movable gate valve should be at least 23×0.1m, but considering the instantaneous speed of explosion propagation, the installation distance should be defined as or 5 times, that is, the installation distance between the sensor and the gate valve should be 11.5m; in normal operation, the test value of the differential pressure sensor 10 at two sides should be within the threshold range of dust safety and non-explosion; the cylinder 8 is arranged at the top of the valve body 5 and is divided into an upper air chamber cavity and a lower air chamber cavity by a piston, and the movable plugboard 3 is welded in the lower air chamber cavity of the cylinder 8 and is connected to the plugboard connecting rod 4 on the piston; the air supply device 12 is respectively communicated with an upper air chamber cavity air inlet 1 and a lower air chamber cavity air inlet 2 of the air cylinder 8 through electromagnetic valves by pressure-resistant pipe fittings, and the upper air chamber cavity and the lower air chamber cavity are respectively welded with an upper air chamber cavity air outlet valve 13 and a lower air chamber cavity air outlet valve 14; the controller 11 is electrically connected with the differential pressure sensor 10, the electromagnetic valve and the air supply device 12, and the electromagnetic valve is arranged on the outer wall of the air cylinder 8 and is covered by a sealing box; the piston moves up and down due to the air pressure change in the upper air chamber cavity and the lower air chamber cavity, and drives the movable flashboard 3 to slide up and down, so that the switching of the opening and closing states of the flashboard valve is realized.
The cross-sectional area of the movable plugboard 3 is larger than that of the dedusting air pipe.
The air supply device 12 is a compressed air bottle, and inert gas is arranged inside the air supply device.
As shown in fig. 2, the upper air chamber air outlet valve 13 and the lower air chamber air outlet valve 14 comprise a sleeve 15 welded on the air cylinder 8, a sealing rubber plug 16 and a bolt 17, the sealing rubber plug 16 is in interference fit inside the sleeve 15, and the end part of the sleeve 15 is locked by the bolt 17 to ensure the sealing of the air chamber. In the normal working process, if the movable plugboard is installed for the first time, the movable plugboard is required to be opened, namely moved upwards, the bolt 17 on the air outlet valve 13 of the upper air chamber cavity is required to be detached, the lower air chamber cavity is inflated, and the bolt 17 on the air outlet valve 13 of the upper air chamber cavity is installed after the movable plugboard is moved upwards; if the gate valve is required to be manually turned off, the bolt 17 on the air outlet valve 14 of the lower air chamber cavity is required to be detached, and the upper air chamber cavity is inflated, so that the gate valve is opened and closed; under the normal working state of the gate valve, bolts 17 on air outlet valves of upper and lower air chamber cavities are installed, when the movable gate plate 3 needs to be closed for explosion suppression, the bolts 17 and the sealing rubber plugs 16 are flushed out of the sleeve 15 for deflation along with gradual downward movement of the gas piston flushed in the upper air chamber cavity, and the gas pressure of the lower air chamber cavity is increased. The pressure resistance of the bolts 17 of the upper air chamber should be greater than that of the bolts 17 of the lower air chamber.
The controller 11 may be an explosion proof box, a PLC, DSP or ARM controller.
The movable plugboard 3 can be square or round, and can be used for pipelines with different shapes respectively.
As shown in fig. 1, in this embodiment, a pneumatic active explosion-proof gate valve and an explosion-proof method are used on a circular pipeline, and the explosion-proof method of the pneumatic active explosion-proof gate valve is as follows: the differential pressure sensor 10, the electromagnetic valve and the air supply device 12 are connected with the controller 11, the controller 11 is used for controlling the differential pressure sensor 10 to monitor the pressure at two ends of the dedusting air pipe in real time, the value detected by the differential pressure sensor 10 at two ends under the normal working condition is far smaller than the pressure threshold value of explosion, when the differential pressure sensor 10 at any side detects a signal exceeding the pressure threshold value, the controller 11 sends a signal to the electromagnetic valve connected with the air supply device 12 and the upper air chamber cavity, the air supply device 12 inflates the upper air chamber cavity, the air pressure of the two air chamber cavities changes to enable the piston in the air cylinder 8 to move downwards, the air pressure of the lower air chamber cavity blows out the bolt 17 and the sealing rubber plug 16 from the sleeve 15 to deflate, and as shown in fig. 4-5, the piston drives the movable plugboard 3 to move downwards to realize closing of the plugboard.
When the movable plugboard 3 needs to be opened to a state shown in fig. 3, the bolt 17 of the air outlet valve 14 of the lower air chamber cavity is locked, the bolt 17 of the air outlet valve 13 of the upper air chamber cavity is disassembled, the controller 11 sends out instructions to the electromagnetic valve and the air supply device 12 connected with the lower air chamber cavity, the electromagnetic valve is opened to charge air in the lower air chamber cavity of the air cylinder 8, the piston drives the movable plugboard to move upwards due to the change of the pressure difference of the upper air chamber cavity and the lower air chamber cavity, the sealing rubber plug 16 of the air outlet valve 13 of the upper air chamber cavity is flushed out of the sleeve 15 to be deflated by the air pressure of the upper air chamber cavity, and the piston drives the movable valve plate to move upwards to open the plugboard valve.
Claims (6)
1. A pneumatic initiative flame proof push-pull valve which characterized in that: the movable valve plate and the dust removal pipeline are sealed, and the movable valve plate and the valve body are sealed by sealing rubber distributed on the surface of the groove; the movable plugboard slides up and down in the groove; the differential pressure sensor is arranged on the dust removing air pipes at the two sides of the valve body; the movable plugboard is welded in the lower air chamber cavity of the air cylinder and connected to a plugboard connecting rod on the piston; the pressure-resistant pipe fitting for the air supply device is respectively communicated with an upper air chamber cavity air inlet and a lower air chamber cavity air inlet of the air cylinder through electromagnetic valves, and the upper air chamber cavity and the lower air chamber cavity are respectively welded with an upper air chamber cavity air outlet valve and a lower air chamber cavity air outlet valve; the controller is electrically connected with the differential pressure sensor, the electromagnetic valve and the air supply device; the piston moves up and down due to the air pressure change in the upper air chamber cavity and the lower air chamber cavity, so that the movable flashboard is driven to slide up and down, and the switching of the opening state and the closing state of the flashboard valve is realized;
the upper air chamber cavity air outlet valve and the lower air chamber cavity air outlet valve comprise a sleeve, a sealing rubber plug and a bolt, wherein the sleeve, the sealing rubber plug and the bolt are welded on the air cylinder, the sealing rubber plug is in interference fit in the sleeve, and the end part of the sleeve is locked by the bolt to ensure the sealing of the air chamber cavity;
the bolt pressure resistance of the upper air chamber cavity is larger than that of the lower air chamber cavity.
2. The pneumatic active explosion-proof gate valve according to claim 1, wherein: the distance between the differential pressure sensor and the movable plugboard is determined according to the wind speed and the plugboard response time of the actual working condition, the response time of the plugboard valve under different working conditions is different, the response time of the plugboard valve applied to the dust removing air pipes with different cross sections is also different, and the actual installation distance of the sensor is also different.
3. The pneumatic active explosion-proof gate valve according to claim 1, wherein: the cross-sectional area of the movable plugboard is larger than that of the dedusting air pipe.
4. The pneumatic active explosion-proof gate valve according to claim 1, wherein: the air supply device is a compressed air bottle, and inert gas is arranged in the air supply device.
5. The pneumatic active explosion-proof gate valve according to claim 1, wherein: the movable plugboard is square or round and can be used on pipelines with different shapes respectively.
6. An explosion suppression method based on the pneumatic active explosion suppression gate valve disclosed in claim 1, which is characterized by comprising the following steps: the method comprises the following steps: when the pressure difference sensor at any side detects a signal exceeding the pressure threshold, the controller sends a signal to the electromagnetic valve connected with the air supply device and the upper air chamber, the air supply device inflates the upper air chamber, the air pressure of the two air chamber changes to enable the piston in the air cylinder to move downwards, the air pressure of the lower air chamber washes the sealing rubber plug out of the sleeve to deflate, and the piston drives the movable plug board to move downwards to realize closing of the plug board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911283042.XA CN110848447B (en) | 2019-12-13 | 2019-12-13 | Pneumatic active explosion-proof gate valve and explosion-proof method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911283042.XA CN110848447B (en) | 2019-12-13 | 2019-12-13 | Pneumatic active explosion-proof gate valve and explosion-proof method |
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| Publication Number | Publication Date |
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| CN110848447A CN110848447A (en) | 2020-02-28 |
| CN110848447B true CN110848447B (en) | 2023-11-24 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111396611A (en) * | 2020-04-29 | 2020-07-10 | 大连度达理工安全***有限公司 | Mechanical active explosion-proof device |
| CN111420325A (en) * | 2020-04-29 | 2020-07-17 | 大连理工度达安全工程有限公司 | Dust explosion-proof integrated system |
| CN112943997B (en) * | 2021-01-26 | 2023-03-24 | 广州特种机电设备检测研究院 | Active explosion-proof device for dust explosion |
| CN113843718A (en) * | 2021-08-09 | 2021-12-28 | 深圳市鑫达辉软性电路科技有限公司 | Automatic adder of sandblast sand material |
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2019
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| CN1128331A (en) * | 1994-08-10 | 1996-08-07 | 株式会社基茨 | Valve driving apparatus |
| JP2012029968A (en) * | 2010-08-02 | 2012-02-16 | Hochiki Corp | Hydrant device inspection system |
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