CN203453564U - Positive pressure type explosion-proof control system - Google Patents
Positive pressure type explosion-proof control system Download PDFInfo
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- CN203453564U CN203453564U CN201320485920.8U CN201320485920U CN203453564U CN 203453564 U CN203453564 U CN 203453564U CN 201320485920 U CN201320485920 U CN 201320485920U CN 203453564 U CN203453564 U CN 203453564U
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Abstract
The utility model discloses a positive pressure type explosion-proof control system. The positive pressure type explosion-proof control system is mainly characterized in that the positive pressure type explosion-proof control system is provided with a main control unit and a pressure relief unit; the main control unit comprises a gas source adjustment proportional distribution gas channel, a high flow regular purging gas exchange gas channel and a dynamic pressure stabilizing gas channel. The modified membrane type amplification and nozzle baffle technology, the logic sampling technology and the pore plate differential pressure flow technology are adopted in the gas channels. According to the system, from principle design to implementation, the high reliability is placed in the first place always, various aspects such as principle design, component selection and processing technology are considered systematically, and therefore a reliable product is obtained. Due to the fact that when a motor is started, runs or is loaded, pressure fluctuation in a shell is large and even negative pressure may be generated, the positive pressure type explosion-proof control system needs to be high in dynamic following and response speed. Due to the fact that the technical scheme is adopted in the system, compared with the prior art, the positive pressure type explosion-proof control system has high operation reliability and excellent dynamic response performance.
Description
Technical field
The utility model belongs to positive-pressure explosion-proof equipment technical field, is specifically related to a kind of positive voltage type anti-explosion Full automatic penumatic voltage-stabilization control system, is mainly used in positive voltage type anti-explosion motor, also can be used for the occasion that other need to realize positive-pressure explosion-proof.
Background technique
Motor is explosion-proof is mainly divided into three kinds: flame-proof type, INCREASEDSAFETY, positive pressure type.If positive voltage type anti-explosion electric owner is by positive voltage type anti-explosion control system; before electric motor starting; the shielding gas such as pressurized air that flow is larger import in electric machine casing, and the pressure-relief valve being connected with electric machine casing is opened, and purge to remove to enter the hazardous gas in electric machine casing.After purging completes, by linkage starting electrical machinery, move, positive pressure system enters pressurize voltage stabilizing state of a control (because anti-explosion motor housing exists gas leakage, in housing, need leakage compensation), guarantee the pressure stability in electric machine casing, and all the time higher than extraneous (at least 50Pa), stop the extraneous inflammable gas that may exist to enter motor internal, thereby reach explosion-proof object.
General positive voltage type anti-explosion control gear, there is not large fluctuation in the pressure in the positive pressure vessel of controlling when operation, easily obtains stable malleation, and control gear is relatively simple, there is no voltage stabilizing pressurizer, or not tight to dynamic response requirement.And motor positive voltage type anti-explosion control system, maximum difference is that it has relatively high expectations to dynamic voltage stabilizing function.At electric motor starting, when dragging load and shutting down change; the change of rotor speed can cause housing internal pressure to fluctuate widely; even can produce moment negative pressure; this just requires positive pressure explosion-proof control system to have the characteristic that voltage stabilizing dynamic response is fast, follow-up capability is strong, effective; can provide at any time one with fluctuation opposite effect; supplement fast flow, guarantee malleation dynamic stability in housing.
Motor positive voltage type anti-explosion control system, belongs to emerging technology at home, and just at present, product still be take import as main.Home products still belongs to development, and the space of technological improvement and raising is larger.As the core technology of positive voltage type anti-explosion control system, be mainly its permanent reliability of operation and dynamic fast-response.
Summary of the invention
For this reason, the purpose of this utility model is to design a kind of novel positive voltage type anti-explosion Full automatic penumatic voltage-stabilization control system.
For achieving the above object, the technological scheme that the utility model is taked is that this positive voltage type anti-explosion control system has main control unit and pressure release unit; Described main control unit comprises that source of the gas regulates pro rate gas circuit, large traffic timing to purge ventilation gas circuit and dynamic following voltage stabilizing gas circuit.
Above-mentioned source of the gas regulates pro rate gas circuit: source of the gas is through filtering pressure regulator valve, enter after precise pressure regulating valve, be divided into 6 branches, wherein two access Pneumatic valves inlet openings, after all the other four access Pneumatic choke devices, source of the gas reference signal or logical signal are provided to respectively four pneumatic Auto-control of Micro-pressure sensors.
Above-mentioned large traffic timing purges ventilation gas circuit: source of the gas is pressure regulator valve after filtration, and to flow throttling ball valves, ball valve is used for regulating suitable purge flow rate, then arrives the P mouth of two-position three-way valve, and now C mouth is without air pressure, and air-flow goes out from A mouth, enters malleation housing, and housing internal pressure rises.By P0 mouth, introduce main control unit, be divided into three pneumatic Auto-control of Micro-pressure sensors of three tunnel accesses, carry out pressure ratio and logic amplification, pneumatic Auto-control of Micro-pressure sensor action before this, then drive the action of I and II pneumatic valve, air-flow is through the A mouth of three grades of pneumatic valves, arrive P1 delivery outlet, P1 delivery outlet connects the P1 mouth of pressure release unit again, and the P1 mouth of pressure release unit has after air pressure, cylinder is opened baffle plate, purging air-flow in housing, through orifice plate differential pressure flowmeter, enters pressure release unit housings, by exhaust outlet, discharge pressure release unit.Arrive this, purge ventilation gas circuit and complete.
Above-mentioned dynamic following voltage stabilizing gas circuit: source of the gas is the inlet opening P of pressure regulator valve and novel pneumatic modulating valve after filtration, through delivery outlet A, to two-position three-way valve, sends into malleation housing by delivery outlet A.Pressure signal in housing is through sampling, by P0 mouth, give pneumatic Auto-control of Micro-pressure sensor, by pneumatic Auto-control of Micro-pressure sensor, carry out logic amplification, the inlet opening C of novel pneumatic modulating valve is linked in output, acts on diaphragm below, compare with setting pressure, result can make diaphragm make to move up or down, and band ovable valve stem moves, and controls spool opening degree, thereby control the size of air inflow, stablize the pressure in housing.As long as the pressure in malleation housing changes, pressure after sampling is amplified, will compare with setting pressure, result will make diaphragm make to move up or down, band ovable valve stem, controls spool opening degree, thereby controls the size of air inflow, stablize the size of housing internal pressure, realize dynamic voltage stabilizing.
Above-mentioned dynamic voltage stabilizing gas circuit relates to two key elements: pneumatic Auto-control of Micro-pressure sensor and novel pneumatic modulating valve.
Described pneumatic Auto-control of Micro-pressure sensor is mainly comprised of arc gel silica membrane (flexible, the life-span length of moving), push rod (being driven by diaphragm), spring and nozzle.Arc gel silica membrane contacts with push rod, and on push rod, cover has spring, forms membrane type enlarger; Push rod, just corresponding to nozzle, forms nozzle-baffle mechanism.This product mix membrane type amplify and nozzle flapper pneumatics, product specification novelty.During work, minute-pressure acts on diaphragm, and diaphragm drives push rod motion, thereby controls the size of air inflow, has realized dynamic following and voltage stabilizing.
Described novel pneumatic modulating valve has valve body, at valve body internal upper part, be provided with pneumatic diaphragm, pneumatic diaphragm center and valve rod are fixed together, in valve body, below pneumatic diaphragm, be provided with and independently control air chamber, control air chamber one side and have a gas control input interface, introduce and control air pressure, act on pneumatic diaphragm below.During work and setting pressure compare, result can make diaphragm move up and down, band ovable valve stem is controlled the opening degree of spool, thereby controls air inflow size.Between control air chamber bottom and output, be provided with a passage, fix a throttling vent plug in port, there is a throttle orifice at throttling vent plug center.
On pneumatic diaphragm, by a spring, carry out elasticity with the push rod of adjusting knob drive and be connected, adjust knob for setting the initial opening degree of valve.
Pressure release unit comprises pneumatic orifice meter assembly and safety relief valve.
Pneumatic orifice meter assembly comprises orifice plate, orifice plate inside and outside differential pressure inductive probe, differential pressure transducer.Gas flow is through orifice plate, and inside and outside orifice plate, two sides produces draught head, and signal is delivered to differential pressure transducer by pressure reduction inductive probe, by determining current gas flow after main control unit logical calculated, with this, controls purge flow rate.Gas flow size is by orifice plate bore and presses extent to decide in general.If orifice plate bore is fixed, flow determines by magnitude of pressure differential, if pressure reduction is fixed, flow is determined by orifice plate caliber size.Traditional pneumatic orifice meter adopts fixedly orifice plate bore, by detecting different pressure reduction, detect flow, in the time need to detecting several different flow, just need to detect several different orifice plate inside and outside differential pressures, corresponding several differential pressure transducers, the pure pneumatic implementation structure more complicated of just needing.This positive pressure system in design, only detects fixing pressure reduction with a differential pressure transducer, by adopting different bore orifice plates, realizes different flow.Like this in pneumatic design, simple for structure, reliable operation.
Safety relief valve: while guaranteeing that housing internal pressure reaches Decompression valves setting value, by Decompression valves exhaust.Design certain exhaust aperture, corresponding with the valve opening of main control unit, even in the situation that master control is broken down, the pressure in housing can obtain safety control.
This system mainly contains three large functions: one, large traffic timing purges ventilation, and two, the dynamic voltage stabilizing of ventilation after finishing, three, output interlock signal.
The technological core of positive pressure explosion-proof control system, is primarily to guarantee its reliability of operation, is secondly the fast-response that operation state is followed.In design, select pneumatic control mode, do not relate to electronic device, essential safety, is not subject to any electromagnetic interference influence.Adopt fully automatic operation mode, stop personal factor, thorough tight on Functional Design, while guaranteeing that malleation housing inherence powers up all the time in highly reliable state.The gas circuit design of science and the innovation of pneumatic control valve improvement, and special diaphragm design improves the dynamic response of whole system greatly, the performance same kind of products at abroad performance that forereached.
For the element of needs design processing, as pneumatic Auto-control of Micro-pressure sensor, two kinds of ripe pneumaticses of montage in design: membrane type amplifies and nozzle flapper technology, is grouped together.By two differences and the ripe technical combinations new function of having got up, realize technological innovation.In element selection, such as the pneumatic diaphragm of sensor, select reliable and stable silica gel material, the combination of diaphragm and plastic components, has adopted compound molding but not bonding, is the high reliability of guaranteeing assembly equally.Gas circuit design adopts the ingenious combination of novel pneumatic modulating valve technology and Auto-control of Micro-pressure sensor technology, and the particular design of diaphragm, lightweight in addition, is quick on the draw, and dynamic response performance greatly improves.
The utility model application is large-size machine; Large-size machine has the characteristic of high voltage, large electric current, and surrounding magnetic field environment is severe, so control gear must possess the characteristic of anti-magnetic interference.Positive voltage type anti-explosion control system adopts pneumatic control design completely, not containing electronic circuit, has the advantages that not disturbed by strong-electromagnetic field.In addition, for avoiding the unreliable factor of manual operation, whole system adopts the mode of operation of full-automatic gas control, and system has higher unfailing performance.The application of the design of special gas circuit and novel pneumatic modulating valve, and special diaphragm design improves the dynamic response of whole system greatly, the performance same kind of products at abroad performance that forereached, is the best product of replace imported.
Because the utility model has been taked technique scheme, compared with prior art, the utlity model has reliability height and the fast advantage of dynamic response.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, structure characteristic of the present utility model is described further.
Fig. 1 is main control unit gas circuit realization figure of the present utility model.
Fig. 2 is pressure release of the present utility model unit gas circuit realization figure.
Fig. 3 is the structural representation of the pneumatic Auto-control of Micro-pressure sensor of the utility model.
Fig. 4 is the structural representation of the utility model novel pneumatic modulating valve.
Fig. 5 is the structural representation of the utility model novel pneumatic modulating valve application.
In accompanying drawing 1: the pneumatic Auto-control of Micro-pressure sensor of 1-4., 5-8. Pneumatic choke device, 11-17. two-position three-way valve, 18. flame-proof switches, 19. pneumatic tutorial light, 20. two-position three-way valves, 21. novel pneumatic modulating valve, 22. Pneumatic timer devices, 23. precise pressure regulating valves, 25. filter regulators, 26. pneumatic tutorial light, 28. ball valves, 29. shuttle valves, 31. air valve fitting seat one, 32. air-capacitors, 33. air valve fitting seat two, 35-37. cylinder, 38, 39. flame-proof switches, 40. orifice differential pressure flowmeters, 41. cylinders, 42. safety relief valves, 43. exhaust outlets (band back-fire relief net), 44. pressure release unit housings, 45. purge exhaust port cover plate, 46. the pneumatic fast connecting terminal of erecting of panel, 47. camber gel silica membranes, 48. push rods (being baffle plate), 49. nozzles, 50. minute-pressure inputs, 51. springs, 52. pneumatic diaphragms, 53. control air chamber, 54. gas control input interfaces, 55. throttling vent plugs, 56. are communicated with the passage of lower chamber and output, 57. locking nuts, 58. adjust knob, 59. valve bodies, 60. amplifiers, 61. gas control inputs, 62. novel pneumatic modulating valve, 63. positive pressure vessels.
P. pneumatic valve input, the output of A. pneumatic valve, the exhaust of E. pneumatic valve, the input of C. pneumatic valve gas control, the input of P0. pressure sensing, the pneumatic output of P1. (effectively high), P2, the input of P3. pressure reduction.
Embodiment
Positive pressure explosion-proof control system described in the utility model has main control unit and pressure release unit; Described main control unit comprises that source of the gas regulates pro rate gas circuit, large traffic timing to purge ventilation gas circuit and dynamic voltage stabilizing gas circuit.
The gas circuit of whole system is divided into two unit, and main control unit is as Fig. 1, and pressure release unit is as Fig. 2.For the ease of installing, main control unit has adopted two integration plates that include pipeline.
Whole system mainly contains three large functions: one, large traffic timing purges ventilation, and two, the dynamic voltage stabilizing of ventilation after finishing, three, output interlock signal.
Source of the gas regulates pro rate gas circuit: source of the gas is through filtering pressure regulator valve 25, enter precise pressure regulating valve 23, be divided into afterwards 6 branches, the wherein inlet opening P(pneumatic valve input of two access air valves 16,17), after all the other four access Pneumatic choke devices 5 ~ 8, source of the gas reference signal or logical signal are provided to respectively four pneumatic Auto-control of Micro-pressure sensors 1 ~ 4.
Large traffic timing purges ventilation gas circuit: source of the gas is pressure regulator valve 25 after filtration, enters flow throttling ball valves 28, and ball valve is used for regulating suitable purge flow rate, then arrives the P mouth of two-position three-way valve 20, and now C mouth is without air pressure, and air-flow goes out from A mouth, enters malleation housing; Housing internal pressure rises, by P0 mouth, introduce main control unit, be divided into three pneumatic Auto-control of Micro-pressure sensors 1,3,4 of three tunnel accesses, pneumatic Auto-control of Micro-pressure sensor action before this, pneumatic valve 16 actions, drive pneumatic valve 12 actions, and air-flow is through the A mouth of pneumatic valve 13, arrive P1 delivery outlet, P1 delivery outlet connects the P1 mouth of pressure release unit again; See Fig. 2, the P1 mouth of pressure release unit has after air pressure, and cylinder 41 is opened baffle plate 45, and the purging air-flow in housing, through orifice plate differential pressure flowmeter 40, enters pressure release unit housings 44, by exhaust outlet 43, discharges pressure release unit.Arrive this, purge ventilation gas circuit and complete.
Dynamic following voltage stabilizing gas circuit: source of the gas is pressure regulator valve 25 after filtration, the inlet opening P of access novel pneumatic modulating valve 21, through delivery outlet A, to two-position three-way valve 20, by delivery outlet A, send into malleation housing, pressure signal in housing is through sampling, by P0 mouth, give pneumatic Auto-control of Micro-pressure sensor 1, by pneumatic Auto-control of Micro-pressure sensor 1, making logic amplifies, the inlet opening C of novel pneumatic modulating valve 21 is linked in output, compare with setting pressure, result can make on diaphragm, lower movement, band ovable valve stem, control the opening degree of spool, thereby control air inflow size, realize housing internal pressure stable.
Gas circuit design adopts improved membrane type to amplify and nozzle flapper technology, target container pressure logic sampling technique, novel pneumatic modulating valve, orifice plate differential pressure flow techniques, makes that whole system is succinct, reliable, science.Accompanying drawing 1, Fig. 2 are shown in gas circuit design.
In gas circuit, dynamic response relates to two key elements: pneumatic Auto-control of Micro-pressure sensor and novel pneumatic modulating valve.
Described pneumatic Auto-control of Micro-pressure sensor, it is mainly constructed as shown in Figure 3, by camber gel silica membrane 47(motion flexibly, the life-span is long), push rod 48(drives by diaphragm), spring 51 and nozzle 49 etc. form, applied in any combination membrane type amplifies and nozzle flapper pneumatics, during work, minute-pressure acts on diaphragm, diaphragm drives push rod motion, thereby controls air pressure size.This product mix membrane type amplify and nozzle flapper pneumatics, product specification novelty.During work, minute-pressure acts on diaphragm, and diaphragm drives push rod motion, thereby controls the size of air inflow, has realized dynamic following and voltage stabilizing.
The realization of novel pneumatic modulating valve: Fig. 4 is the structural drawing of novel pneumatic modulating valve.Described novel pneumatic modulating valve has valve body, at valve body internal upper part, be provided with pneumatic diaphragm 52, pneumatic diaphragm 52 centers and valve rod are fixed together, in valve body, below pneumatic diaphragm, be provided with and independently control air chamber, control air chamber one side and have a gas control input interface, introduce and control air pressure, act on pneumatic diaphragm below.During work and setting pressure compare, result can make diaphragm move up and down, band ovable valve stem is controlled the opening degree of spool, thereby controls air inflow size.Between control air chamber bottom and output, be provided with a passage, fix a throttling vent plug 55 in port, there is a throttle orifice at throttling vent plug center.
On pneumatic diaphragm, by a spring, carry out elasticity with the push rod of adjusting knob drive and be connected, adjust knob for setting the initial opening degree of valve.
During practical application, select a, technology maturation close with novel pneumatic modulating valve agent structure, highly reliable membrane type Pneumatic precision pressure regulator valve (precise pressure regulating valve has the control air chamber that is independently positioned at diaphragm below), process improvement.Improvement has 2 points:
One, on control air chamber one side body, hole, tracheae is installed and is connect soon, as sampling gas control inlet opening 54.
Two, precise pressure regulating valve has a path between control air chamber and output, and the vent plug 55(center drilling of a center drilling is installed thereon, and diameter is looked concrete application and determined, can be zero).
High reliability through the harmless existing product in above two places is improved, and can obtain the novel pneumatic modulating valve of a special use, greatly reduces difficulty of processing, without checking for a long time again, shortens time to market (TTM).
The dynamically realization of voltage stabilizing: combined by Auto-control of Micro-pressure sensor and novel pneumatic modulating valve.
Novel pneumatic modulating valve is the improvement and bring new ideas of membrane type Pneumatic precision pressure regulator valve function.Traditional Pneumatic precision pressure regulator valve, inner sample point comes from pressure regulator valve output port, and its output port pressure and target container pressure size there are differences.In order to control more realistically the pressure in target container, novel pneumatic modulating valve be by the true pressure in target container through sampling gas circuit after, through Auto-control of Micro-pressure sensor, carry out logic amplification again, introduce the inlet opening of novel pneumatic modulating valve, act on diaphragm below, compare with setting pressure, result effect and diaphragm, band ovable valve stem moves, and changes the opening degree of spool, thereby control the size of air inflow, the pressure in stable objects container.
Output interlock signal: see Fig. 1 main control unit, pneumatic logic, by cylinder 35 ~ 37, drives three flame-proof switches 38,39,18.Three flame-proof switches are without source contact, and lighting outlet and master-control room are connected.By three interlock signals, in housing, after purging ventilation, when system enters pressurize operating mode, can power up starting electrical machinery.Once housing internal pressure is down to early warning pressure, sends alarm signal, when pressure is further down to minimum, interlock power-off.
Pressure release unit is mainly comprised of pneumatic orifice meter assembly and safety relief valve.
Pneumatic orifice meter assembly: airflow passes orifice plate, inside and outside orifice plate, two sides produces draught head, and gas flow is corresponding with orifice plate bore and pressure reduction.This system in design, only detects fixing pressure reduction with a differential pressure transducer, adopts serial different bore orifice plate, realizes different flow.Like this in pneumatic realization, simple for structure, reliable operation.
The safety relief valve of pressure release unit: while guaranteeing that housing internal pressure reaches Decompression valves setup pressure value, by Decompression valves exhaust.The ball valve aperture of exhaust aperture and main control unit matches, even in the situation that main control unit breaks down, when housing internal pressure reaches Decompression valves operating valve value pressure, Decompression valves is opened, and guarantees security of system.
Claims (5)
1. a positive voltage type anti-explosion control system, is characterized in that this system has main control unit and pressure release unit, described main control unit comprises that source of the gas regulates pro rate gas circuit, large traffic timing to purge ventilation gas circuit and dynamic following voltage stabilizing gas circuit, above-mentioned gas circuit adopts pneumatic Auto-control of Micro-pressure sensor and novel pneumatic modulating valve, above-mentioned source of the gas regulates the source of the gas of pro rate gas circuit through filtering pressure regulator valve, Yi Ge branch enters precise pressure regulating valve, be divided into afterwards 6 branches, wherein two access Pneumatic valves inlet openings, after all the other four access Pneumatic choke devices, source of the gas reference signal or logical signal are provided to respectively four pneumatic Auto-control of Micro-pressure sensors, above-mentioned large traffic timing purges ventilation gas circuit: source of the gas is pressure regulator valve after filtration, and to flow throttling ball valves, ball valve is used for regulating suitable purge flow rate, then arrives the P mouth of two-position three-way valve, and now C mouth is without air pressure, and air-flow goes out from A mouth, enters malleation housing, housing internal pressure rises, and by P0 mouth, introduces main control unit, is divided into three pneumatic Auto-control of Micro-pressure sensors of three tunnel accesses, pneumatic Auto-control of Micro-pressure sensor action before this, first step air-valve action, then drive the action of secondary pneumatic valve, air-flow is through the A mouth of pneumatic valve, then to P1 delivery outlet, P1 delivery outlet connects the P1 mouth of pressure release unit, P1 mouth has after air pressure, and cylinder is opened baffle plate, the purging air-flow in housing, through orifice plate differential pressure flowmeter, enter pressure release unit housings, by exhaust outlet, discharge pressure release unit, above-mentioned dynamic voltage stabilizing gas circuit: source of the gas is pressure regulator valve after filtration, the inlet opening P of access novel pneumatic modulating valve, through delivery outlet A, to two-position three-way valve, by delivery outlet A, send into malleation housing, pressure signal in housing is after sampling, by P0 mouth, deliver to pneumatic Auto-control of Micro-pressure sensor, by pneumatic Auto-control of Micro-pressure sensor, making logic amplifies and controls, the inlet opening C of novel pneumatic modulating valve is linked in output, compare with setting pressure, result acts on diaphragm, band ovable valve stem moves, change the opening degree of spool, thereby control the size of air inflow, stablize the pressure in housing, realize dynamic voltage stabilizing.
2. positive voltage type anti-explosion control system according to claim 1, is characterized in that described pneumatic Auto-control of Micro-pressure sensor is mainly comprised of arc gel silica membrane, push rod, spring and nozzle; Arc gel silica membrane contacts with push rod, and on push rod, cover has spring, forms membrane type enlarger; Push rod, just corresponding to nozzle, forms nozzle-baffle mechanism.
3. positive voltage type anti-explosion control system according to claim 2, it is characterized in that described novel pneumatic modulating valve has valve body, at valve body internal upper part, be provided with pneumatic diaphragm, pneumatic diaphragm center and valve rod are fixed together, in valve body, below pneumatic diaphragm, be provided with and independently control air chamber, control air chamber one side and have a gas control input interface, introduce and control air pressure, act on pneumatic diaphragm below; During work and setting pressure compare, result can make diaphragm move up and down, band ovable valve stem is controlled the opening degree of spool, thereby controls air inflow size; Between control air chamber bottom and output, be provided with a passage, fix a throttling vent plug in port, there is a throttle orifice at throttling vent plug center.
4. positive voltage type anti-explosion control system according to claim 3, it is characterized in that on pneumatic diaphragm by a spring with adjust push rod that knob drives and carry out elasticity and be connected, adjust knob for setting the initial opening degree of valve.
5. positive voltage type anti-explosion control system according to claim 1, is characterized in that described pressure release unit includes pneumatic orifice meter assembly and safety relief valve.
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| CN201320485920.8U CN203453564U (en) | 2013-08-09 | 2013-08-09 | Positive pressure type explosion-proof control system |
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| CN201320485920.8U CN203453564U (en) | 2013-08-09 | 2013-08-09 | Positive pressure type explosion-proof control system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103423496A (en) * | 2013-08-09 | 2013-12-04 | 南阳市华业防爆仪表有限公司 | Positive pressure type explosion-proof control system |
| CN107345592A (en) * | 2017-08-17 | 2017-11-14 | 中国农业科学院农田灌溉研究所 | A kind of irrigation water delivery pipe flow sensing regulating valve |
| CN108389604A (en) * | 2018-03-29 | 2018-08-10 | 眉山麦克在线设备股份有限公司 | Positive pressure purges explosion-proof control system |
-
2013
- 2013-08-09 CN CN201320485920.8U patent/CN203453564U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103423496A (en) * | 2013-08-09 | 2013-12-04 | 南阳市华业防爆仪表有限公司 | Positive pressure type explosion-proof control system |
| CN107345592A (en) * | 2017-08-17 | 2017-11-14 | 中国农业科学院农田灌溉研究所 | A kind of irrigation water delivery pipe flow sensing regulating valve |
| CN108389604A (en) * | 2018-03-29 | 2018-08-10 | 眉山麦克在线设备股份有限公司 | Positive pressure purges explosion-proof control system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140226 Effective date of abandoning: 20151223 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |