CN105376997B - Control method of positive pressure explosion-proof control cabinet - Google Patents
Control method of positive pressure explosion-proof control cabinet Download PDFInfo
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- CN105376997B CN105376997B CN201510796124.XA CN201510796124A CN105376997B CN 105376997 B CN105376997 B CN 105376997B CN 201510796124 A CN201510796124 A CN 201510796124A CN 105376997 B CN105376997 B CN 105376997B
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- pressure
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- module
- control cabinet
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
- H05K7/20145—Means for directing air flow, e.g. ducts, deflectors, plenum or guides
Abstract
The invention provides a positive pressure explosion-proof control cabinet. Malleation explosion-proof switch board includes air feed module, pressure release module, control module, unusual alarm module and power switching module, the air feed module with the cooperation of pressure release module is in order to maintain the malleation of malleation explosion-proof switch board malleation intracavity, control module respectively with the air feed module pressure release module unusual alarm module reaches power switching module electricity is connected, unusual alarm module is used for reporting to the abnormal operation of malleation explosion-proof switch board, power switching module is used for controlling the user electrical system's of malleation explosion-proof switch board malleation intracavity power. The invention further provides a control method of the positive pressure explosion-proof control cabinet. The positive pressure explosion-proof control cabinet and the control method thereof provided by the invention not only have stable air supply and high safety, but also can effectively solve the problem of heat dissipation of the positive pressure explosion-proof control cabinet, thereby achieving the effects of energy conservation and environmental protection and improving the reliability and stability of the operation of the positive pressure explosion-proof control cabinet.
Description
Technical field
The present invention relates to explosion proof control case fields, specifically, being related to a kind of positive-pressure explosion-proof control cabinet and its control method.
Background technique
With China's industry continuous development and it is production-scale be growing, such as in petroleum, chemical industry, metallurgy, oil field, coal
The scene of the danger industry such as charcoal and plastic spraying, positive voltage type anti-explosion cabinet is more and more extensive to be used for explosion risk gas
Body or steam an area (when operating normally, in fact it could happen that the place of explosive gas atmosphere) He Erqu (when operating normally,
The place of explosive gas atmosphere can not occur；If there is being also to occur once in a while and be only place existing for the short time)
Hazardous area, especially to the various electric control systems and automatic control system cabinet being in explosion risk region.By
Adverse effect of the severe environmental conditions to device in cabinet and instrument etc. can be overcome well in the presence of positive pressure in cabinet, thus
Make whole system that there is explosion-proof, dust-proof, moisture-proof and corrosion-resistant performance, greatly improves the environmental suitability of cabinet.
Currently, existing positive-pressure explosion-proof cabinet has ventilated type and two kinds compensation, the two can solve the electrical anti-of cabinet
Quick-fried problem.In actual use, ventilated type positive-pressure explosion-proof cabinet can be pressurized enclosure internal heat generation component or high-power heating part
The heat of part is taken away, so that the problem of efficiently solving cooling machine cabinet, greatlys improve the working life of each device in cabinet, instrument
And reliability, but its air consumption is compensation tens times or even hundred times.And for compensation positive-pressure explosion-proof cabinet, work
The requirement of mode itself, which determines shell necessarily, to be had than ventilated type positive-pressure explosion-proof cabinet better seal structure, to make cabinet
Radiating condition more deteriorate, the aging of component is accelerated, especially to heating element or high-power heat generating components
Cabinet and take the cabinet of intensive mounting means, heat dissipation is the technical issues of must be taken into consideration.Under normal conditions, people can examine
Consider the heat dissipation problem that cabinet is solved using heat pipe heat radiation technology, but since the application of hot pipe technique certainly will greatly improve product
Cost, this overall design philosophy are economically undesirable.
Therefore, it is necessary to further be developed to existing positive-pressure explosion-proof cabinet, to avoid drawbacks described above.
Summary of the invention
It cannot realize that the technology of heat dissipation and economical and energy saving is asked simultaneously to solve above-mentioned existing positive-pressure explosion-proof cabinet presence
Topic, the present invention provide a kind of positive-pressure explosion-proof control cabinet and its control method, and not only gas supply is stablized, is highly-safe, but also can be effective
Solve the problems, such as that positive-pressure explosion-proof controls cabinet heat radiation, to achieve the effect that energy-saving and environmental protection and improve the operation of positive-pressure explosion-proof control cabinet
Reliability and stability.
The present invention provides a kind of positive-pressure explosion-proof control cabinet, the positive-pressure explosion-proof control cabinet include gas supply module, pressure release module,
Control module, abnormal alarm module and power supply switching module, the gas supply module and the pressure release module cooperate to maintain positive pressure
The intracavitary positive pressure of explosion proof control case positive pressure, the control module respectively with the gas supply module, the pressure release module, the exception
Alarm module and power supply switching module electrical connection, the abnormal alarm module are used for the different of the positive-pressure explosion-proof control cabinet
Often operation is alarmed, and the power supply switching module is electrically for controlling the intracavitary user of the positive-pressure explosion-proof control cabinet positive pressure
The power supply of system, wherein
The gas supply module includes gas source preparation unit and supply unit, and the gas source preparation unit includes passing sequentially through pipe
Air compressor, cooling driers, filter device and the air accumulator of road connection, the supply unit includes switch valve, pressure reducing valve, flow
Regulating valve, supply air line, allocation component and multiple injection apparatus, the switch valve, the pressure reducing valve and the flow control valve
Sequence is set to the supply air line, and the both ends of the supply air line are connected to the air accumulator and the allocation component respectively, institute
The other end for stating allocation component is equipped with multiple shunting interfaces, and multiple shunting interfaces and multiple injection apparatus correspond
Connection.
In a preferred embodiment of the positive-pressure explosion-proof control cabinet provided by the invention, the pressure release module includes exhaust
Mouth and pressure relief opening, and the exhaust outlet includes set on its internal flame-proof switch valve, the pressure relief opening includes internal set on it
Sparker and explosion-proof relief valve.It is described in a preferred embodiment of the positive-pressure explosion-proof control cabinet provided by the invention
Control module includes detector and programmable logic controller (PLC), the programmable logic controller (PLC) respectively with the detector, institute
State gas supply module, the pressure release module, the abnormal alarm module and power supply switching module electrical connection.
In a preferred embodiment of the positive-pressure explosion-proof control cabinet provided by the invention, the detector includes the first pressure
Force detector, second pressure detector, third pressure detector, temperature detector and gas flow rate detector, and described first
Pressure detector is set in the air accumulator, the second pressure detector be set to the pressure reducing valve and the flow control valve it
Between the supply air line in, the third pressure detector and the temperature detector are being set to the positive-pressure explosion-proof control cabinet just
Press intracavitary, the supply air line of the gas flow rate detector set on side of the flow control valve far from the pressure reducing valve
It is interior.
In a preferred embodiment of the positive-pressure explosion-proof control cabinet provided by the invention, the abnormal alarm module includes
The abnormal alarm device being connected electrically.
The present invention also provides a kind of control methods of positive-pressure explosion-proof control cabinet comprising following steps:
Step 1: prepared by gas source: providing air compressor, cooling driers, filter device, air accumulator, first pressure detector
And programmable logic controller (PLC), the compressed air of the air compressor are filled through the cooling of cooling driers processing and the filtering
The air accumulator is stored in after the filtration treatment set, the programmable logic controller (PLC) is detected according to the first pressure detector
The air compressor is controlled to the air pressure signal in the air accumulator and whether the cooling driers work；
Step 2: to the intracavitary gas supply of positive pressure of positive-pressure explosion-proof control cabinet: providing switch valve, pressure reducing valve, flow control valve, confession
Air pipe, allocation component, injection apparatus, exhaust outlet, pressure relief opening, second pressure detector, third pressure detector, temperature detection
Device and gas flow rate detector, the programmable logic controller (PLC) control whether the air accumulator mentions by controlling the switch valve
For protective gas, the programmable logic controller (PLC) is according to the second pressure detector, the third pressure detector, described
The signal of temperature detector and the gas flow rate detector controls the pressure reducing valve and the flow control valve, described in adjusting
The supply gas pressure and gas supply speed, the air accumulator of air accumulator pass through the supply air line, the allocation component and the injection
For device to the positive pressure interacvity air-filling of the positive-pressure explosion-proof control cabinet, the positive-pressure explosion-proof is discharged in the exhaust outlet and the pressure relief opening
The intracavitary gas of the positive pressure of control cabinet；
Step 3: abnormal alarm: abnormal alarm device and power supply switching module are provided, when detecting the positive-pressure explosion-proof control
When cabinet is operating abnormally, the programmable logic controller (PLC) according to the misoperation signal control abnormal alarm device detected into
Row warning note, and the power supply by controlling power supply switching module cutting user's electrical system.
In a preferred embodiment of the control method of the positive-pressure explosion-proof control cabinet provided by the invention, the step 2
The intracavitary gas supply of the middle positive pressure to positive-pressure explosion-proof control cabinet specifically:
Purge mode when long, the positive pressure for the big protective gas of flow to be imported the positive-pressure explosion-proof control cabinet is intracavitary,
To remove its internal hazardous gas；
Leakage compensation mode, for being compensated with the protective gas of small flow due to letting out after the completion of purge mode when described long
The positive-pressure explosion-proof control cabinet positive pressure cavity pressure caused by dew reduces；And
Interval purge mode, for the leakage compensation mode after a period of work or/and in the leakage compensation mould
The positive-pressure explosion-proof control cabinet positive pressure cavity temperature is increased or/and when hypotony, is imported with the big protective gas of flow under formula
The positive pressure of the positive-pressure explosion-proof control cabinet is intracavitary；
When described long after the completion of purge mode, the leakage compensation mode and the interval purge mode alternate run.
Compared to the prior art, the positive-pressure explosion-proof control cabinet provided by the invention and its control method have beneficial below
Effect:
One, the present invention controls the operation of the positive-pressure explosion-proof control cabinet by the control module, not only easy to operate, and
And it is highly-safe, it is also convenient for the management of the positive-pressure explosion-proof control cabinet systematization, so as to avoid the waste of human resources.
Two, the gas storage that the present invention is detected by the programmable logic controller (PLC) according to the first pressure detector
Pressure information in tank controls the air compressor and the cooling driers, and described in the compressed air warp of the air compressor
The air accumulator is stored in as gas source after the cooling processing of cooling driers and the filtration treatment of the filter device, can not only be institute
It states positive-pressure explosion-proof control cabinet and clean protective gas is provided, and supply and stablize, it is highly-safe.
Three, the air accumulator of the invention is by the supply air line, the allocation component and the injection apparatus to institute
Positive-pressure explosion-proof control cabinet gas supply is stated, and the blowing pressure and the Flux Valve Control aeration speed are controlled by the pressure reducing valve,
The problem of not only can effectively solve the positive-pressure explosion-proof control cabinet heat radiation, but also economical and energy saving.
Four, the present invention, can not only by the way that the sparker and the explosion-proof relief valve are arranged in the pressure relief opening
It avoids spark or hot particle from escaping, and is avoided that in the positive-pressure explosion-proof control cabinet that positive pressure is excessively high.
Five, it is alarmed by the abnormal alarm module the misoperation of the positive-pressure explosion-proof control cabinet, is realized
The timely discovery and exclusion of failure.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing, in which:
Fig. 1 is the structural schematic diagram of positive-pressure explosion-proof control cabinet provided by the invention；
Fig. 2 is the step flow chart of the control method of positive-pressure explosion-proof control cabinet provided by the invention；
Fig. 3 is the step flow chart of step S2 in the control method of positive-pressure explosion-proof control cabinet shown in Fig. 2.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that the described embodiments are merely a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts all other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, being the structural schematic diagram of positive-pressure explosion-proof control cabinet provided by the invention.The positive-pressure explosion-proof control cabinet
1 includes gas supply module 11, pressure release module 13, control module 15, abnormal alarm module 17 and power supply switching module 19, the gas supply
Module 11 and the pressure release module 13 cooperate the positive pressure to maintain 1 positive pressure of positive-pressure explosion-proof control cabinet intracavitary, the control mould
Block 15 respectively with the gas supply module 11, the pressure release module 13, the abnormal alarm module 17 and the power supply switching module
19 electrical connections, the abnormal alarm module 17 is for alarming to the misoperation of the positive-pressure explosion-proof control cabinet 1, the electricity
Source switching module 19 is for controlling the intracavitary user's electrical system power supply of 1 positive pressure of positive-pressure explosion-proof control cabinet.
The gas supply module 11 includes gas source preparation unit 111 and supply unit 113, and the gas source preparation unit 111 is used
In preparing pure air, and by the supply unit 113 to the intracavitary release guard gas of 1 positive pressure of positive-pressure explosion-proof control cabinet
Body.
The gas source preparation unit 111 includes air compressor 1111, cooling driers 1113, filter device 1115 and air accumulator
1117, the air compressor 1111, the cooling driers 1113, the filter device 1115 and the air accumulator 1117 successively lead to
The compressed air of piping connection, the air compressor 1111 is filled through the cooling of the cooling driers 1113 processing and the filtering
The air accumulator 1117 is stored in after setting 1115 filtration treatment.In the present embodiment, it is preferred that the gas source preparation unit
111 far from danger zone.
The supply unit 113 includes switch valve 1131, pressure reducing valve 1132, flow control valve 1133, supply air line
1134, allocation component 1135 and multiple injection apparatus 1136, the switch valve 1131, the pressure reducing valve 1132 and the flow tune
Save 1133 sequence of valve be set to the supply air line 1134, the both ends of the supply air line 1134 respectively with the air accumulator 1117 and
The allocation component 1135 is connected to, and the other end of the allocation component 1135 is equipped with multiple shunting interfaces, and multiple shuntings connect
Mouth is connected to multiple one-to-one correspondence of injection apparatus 1136.
The switch valve 1131 closes on 1117 side of air accumulator setting, and for whether controlling the air accumulator 1117
Gas supply.
The pressure reducing valve 1132 is for controlling the blowing pressure.
The flow control valve 1133 closes on 1136 side of the injection apparatus setting, and for adjusting aeration speed.
The injection apparatus 1136 includes jet pipe and multiple nozzles, and the multiple nozzle is set to the jet pipe, the jet pipe
It is connected to the shunting interface of the allocation component 1135 one-to-one correspondence.In the present embodiment, multiple injection apparatus 1136
Arrangement can be adjusted according to the installation situation of the intracavitary user's electrical system of 1 positive pressure of positive-pressure explosion-proof control cabinet.
The pressure release module 13 includes exhaust outlet 131 and pressure relief opening 133, the exhaust outlet 131 and the pressure relief opening 133
It is respectively arranged on the shell of the positive-pressure explosion-proof control cabinet 1.
The exhaust outlet 131 includes set on its internal flame-proof switch valve 1311.
The pressure relief opening 133 includes set on its internal sparker 1331 and explosion-proof relief valve 1333.
The sparker 1331 be used for prevent the intracavitary portion of 1 positive pressure of positive-pressure explosion-proof control cabinet spark or hot
Grain is discharged with air-flow from the explosion-proof relief valve 1333.
The explosion-proof relief valve 1333 is for keeping the positive pressure value in the intracavitary portion of 1 positive pressure of positive-pressure explosion-proof control cabinet to be not more than
Highest preset value.
The control module 15 include detector 151 and programmable logic controller (PLC) 153, the detector 151 with it is described
Programmable logic controller (PLC) 153 is electrically connected.In the present embodiment, the programmable logic controller (PLC) 153 can also pass through network
It is connect with host computer, to realize the networking control of the positive-pressure explosion-proof control cabinet 1.
The detector 151 includes first pressure detector 1511, second pressure detector 1513, third pressure detecting
Device 1515, temperature detector 1517 and gas flow rate detector 1519.
The first pressure detector 1511 is set in the air accumulator 1117.
The second pressure detector 1513 is set to the institute between the pressure reducing valve 1132 and the flow control valve 1133
It states in supply air line 1134.
The third pressure detector 1515 and the temperature detector 1517 are set to 1 positive pressure of positive-pressure explosion-proof control cabinet
It is intracavitary, and be explosion detector.
The gas flow rate detector 1519 is set to side of the flow control valve 1133 far from the pressure reducing valve 1132
The supply air line 1134 in.
The programmable logic controller (PLC) 153 also respectively with the air compressor 1111, cooling driers 1113, described
Switch valve 1131, the pressure reducing valve 1132, the flow control valve 1133 and the flame-proof switch valve 1311 electrical connection, and control
The air compressor 1111, the cooling driers 1113, the switch valve 1131, the pressure reducing valve 1132, the flow are adjusted
Valve 1133 and the flame-proof switch valve 1311.
The abnormal prompt module 17 includes the abnormal alarm device 171 being connected electrically.In the present embodiment, it is preferred that
The abnormal alarm device 171 is sound, light crossing-signal, and is set in the cabinet door of the positive-pressure explosion-proof control cabinet 1.
It is the step flow chart of the control method of positive-pressure explosion-proof control cabinet provided by the invention referring again to Fig. 2.It is described just
Press explosion proof control case control method the following steps are included:
Step S1, prepared by gas source: providing air compressor 1111, cooling driers 1113, filter device 1115, air accumulator
1117, first pressure detector 1511 and programmable logic controller (PLC) 153, the compressed air warp of the air compressor 1111
The air accumulator 1117, institute are stored in after the cooling processing of the cooling driers 1113 and the filtration treatment of the filter device 1115
It states programmable logic controller (PLC) 153 and detects that the air pressure in the air accumulator 1117 is believed according to the first pressure detector 1511
Whether number control air compressor 1111 and the cooling driers 1113 work.
Specifically, the normal operation of the positive-pressure explosion-proof control cabinet 1 needs the gas pressure in the air accumulator 1115 to protect
It holds in a certain range.When the first pressure detector 1511 detects that air pressure is minimum lower than presetting in the air accumulator 1117
When value, the first signal is sent to the programmable logic controller (PLC) 153 by the first pressure detector 1511, described to compile
Journey logic controller 153 controls the air compressor 1111 and the cooling driers 1113 work, the air compressor 1111
Compressed air it is described through being stored in after the filtration treatment of the cooling processing of the cooling driers 1113 and the filter device 1115
Air accumulator 1117；When air pressure reaches default peak in the air accumulator 1117, the first pressure detector 1511 is by
Binary signal is sent to the programmable logic controller (PLC) 153, and the programmable logic controller (PLC) 153 controls the air compressor
1111 and the cooling driers 1113 stop working, the air accumulator 1117 stops inflation.
Step S2, to the intracavitary gas supply of positive pressure of positive-pressure explosion-proof control cabinet 1: providing switch valve 1131, pressure reducing valve 1132, flow
Regulating valve 1133, supply air line 1134, allocation component 1135, injection apparatus 1136, exhaust outlet 131, pressure relief opening 133, second are pressed
Force detector 1513, third pressure detector 1515, temperature detector 1517 and gas flow rate detector 1519, it is described programmable
Logic controller 153 controls the air accumulator 1117 by controlling the switch valve 1131 and whether provides protective gas, it is described can
Programmed logic controller 153 is examined according to the second pressure detector 1513, the third pressure detector 1515, the temperature
The signal for surveying device 1517 and the gas flow rate detector 1519 controls the pressure reducing valve 1132 and the flow control valve
1133, to adjust the supply gas pressure of the air accumulator 1117 and supply speed, the air accumulator 1117 passes through the air supply pipe
The positive pressure of road 1134, the allocation component 1135 and the injection apparatus 1136 to the positive-pressure explosion-proof control cabinet 1 is intracavitary to fill
The intracavitary gas of positive pressure of the positive-pressure explosion-proof control cabinet 1 is discharged in gas, the exhaust outlet 131 and the pressure relief opening 133.
It is the step flow chart of step S2 in the control method of positive-pressure explosion-proof control cabinet shown in Fig. 2 referring again to Fig. 3.Institute
State step S2 specifically includes the following steps:
S2-1, it is long when purge mode, for importing the positive pressure of the positive-pressure explosion-proof control cabinet 1 with the big protective gas of flow
It is intracavitary, to remove its internal hazardous gas；
Specifically, the programmable logic controller (PLC) 153 controls the switch valve 1131 when described long under purge mode
It opens, 1311 standard-sized sheet of flame-proof switch valve in the exhaust outlet 131, the pressure reducing valve 1132 and the flow control valve
1133 to it is long when purge mode working condition, the air accumulator 1117 starts intracavitary to the positive pressure of the positive-pressure explosion-proof control cabinet 1
It is filled with pure air, the pure air purges the intracavitary portion of positive pressure of the positive-pressure explosion-proof control cabinet 1, and by described
The a small amount of hazardous gas in the intracavitary portion of 1 positive pressure of positive-pressure explosion-proof control cabinet is discharged exhaust outlet 131, and the air accumulator 1117 supplies
To after preset time, the programmable logic controller (PLC) 153 controls the flame-proof switch valve 1311 and closes, the positive-pressure explosion-proof control
After the intracavitary positive pressure of the positive pressure of cabinet 1 processed rises to 70Pa, the positive-pressure explosion-proof control cabinet 1 is allowed to obtain electric, when the positive-pressure explosion-proof
When the intracavitary positive pressure of the positive pressure of control cabinet 1 rises to 150Pa, purge mode stops working when described long.In the present embodiment,
The purge time can be adjusted according to the actual situation.
S2-2, leakage compensation mode, for being compensated after the completion of purge mode with the protective gas of small flow when described long
Since the 1 positive pressure cavity pressure of positive-pressure explosion-proof control cabinet caused by revealing reduces；
Specifically, the switch valve 1131 is opened under the leakage compensation mode, the flame-proof switch valve 1311 is closed
It closes, the programmable logic controller (PLC) 153 controls the pressure reducing valve 1132 and the flow control valve 1133 to leakage compensation mould
Formula working condition, the air accumulator 1117 reduces the air demand intracavitary to 1 positive pressure of positive-pressure explosion-proof control cabinet, described to compile
Journey logic controller 153 according to the detection data of the third pressure detector 1515 control the flow control valve 1133 to
The pressure for maintaining 1 positive pressure of positive-pressure explosion-proof control cabinet intracavitary in the normal range, when the third pressure detector 1133 examine
Measuring the intracavitary pressure of 1 positive pressure of positive-pressure explosion-proof control cabinet is more than the programmable logic controller (PLC) 153 when presetting warning value
It controls the switch valve 1131 to close, and the relief valve 1333 in the pressure relief opening 133 starts pressure release at this time, when described
The intracavitary pressure recovery of 1 positive pressure of positive-pressure explosion-proof control cabinet to it is normal when, leakage compensation mode restarting.
S2-3, interval purge mode, for the leakage compensation mode after a period of work or/and in the leakage
The 1 positive pressure cavity temperature of positive-pressure explosion-proof control cabinet increases or/and when hypotony under compensation model, with the big protection gas of flow
The positive pressure that body imports the positive-pressure explosion-proof control cabinet 1 is intracavitary；
Specifically, when the temperature detector 1517 detects on the 1 positive pressure chamber internal temperature of positive-pressure explosion-proof control cabinet
Be raised to default warning value or/and the leakage compensation mode after a period of work, the switch valve 1131 is opened, it is described can
Programmed logic controller 153 controls the pressure reducing valve 1132 and the flow control valve 1133 to interval purge mode state to add
The big air accumulator 1117 air demand intracavitary to 1 positive pressure of positive-pressure explosion-proof control cabinet, and adjust the flame-proof switch valve
1311 opening degrees are to be discharged the intracavitary gas of 1 positive pressure of positive-pressure explosion-proof control cabinet, so that the positive-pressure explosion-proof control be discharged
The inflammable substance discharged in the intracavitary portion of 1 positive pressure of cabinet a small amount of hazardous gas that may be present or electrical equipment, reduction are described just
Press the temperature in the intracavitary portion of 1 positive pressure of explosion proof control case.
When the third pressure detector 1133 detects that the intracavitary positive pressure value of 1 positive pressure of positive-pressure explosion-proof control cabinet is lower than
When 70Pa, the switch valve 1131 is opened, and the flame-proof switch valve 1311 is opened and closed, and the programmable logic controller (PLC) 153 controls
The pressure reducing valve 1132 and the flow control valve 1133 are to increase the air accumulator 1117 to the positive-pressure explosion-proof control cabinet 1 just
Intracavitary air demand is pressed to maintain positive pressure value.
When described long after the completion of purge mode, the leakage compensation mode and the interval purge mode alternate run；
Step S3, abnormal alarm: providing abnormal alarm device 171 and power supply switching module 19, when detecting that the positive pressure is anti-
When quick-fried control cabinet 1 is operating abnormally, the programmable logic controller (PLC) 153 is according to the misoperation signal control detected
Abnormal alarm device 171 carries out warning note, and the power supply of user's electrical system is cut off by controlling the power supply switching module 19.
In the present embodiment, exception information can also be sent to host computer by the programmable logic controller (PLC) 153, and the host computer is logical
It crosses short message published method and notifies corresponding staff.
Specifically, tonifying Qi is unsuccessful under the leakage compensation mode, the detector 151 detects the positive-pressure explosion-proof
When the intracavitary positive pressure of 1 positive pressure of control cabinet is lower than 70Pa, signal is sent to the programmable logic controller (PLC) 153, it is described programmable
Logic controller 153 controls the abnormal alarm device 171 and carries out warning note, and is cut by controlling the power supply switching module 19
The power supply of disconnected and locked user's electrical system, user's operation personnel after eliminating the fault, can unlock the power supply switching module, and
Rerun the step S1 and the step S2.
The positive-pressure explosion-proof control cabinet provided by the invention and its control method have the advantages that
One, the present invention controls the operation of the positive-pressure explosion-proof control cabinet 1 by the control module 15, not only operation letter
Just, and it is highly-safe, it is also convenient for the management of 1 systematization of positive-pressure explosion-proof control cabinet, so as to avoid the wave of human resources
Take.
Two, the present invention is detected by the programmable logic controller (PLC) 153 according to the first pressure detector 1511
Pressure information in the air accumulator 1117 controls the air compressor 1111 and the cooling driers 1113, and the air
The compressed air of compressor 1111 is after the filtration treatment of the cooling processing of the cooling driers 1113 and the filter device 1115
The air accumulator 1117 is stored in as gas source, clean protective gas can not only be provided for the positive-pressure explosion-proof control cabinet 1, and
And gas supply is stablized, it is highly-safe.
Three, the air accumulator 1117 of the invention passes through the supply air line 1134, the allocation component 1135 and described
Injection apparatus 1136 is supplied to the positive-pressure explosion-proof control cabinet 1, and controls the blowing pressure and the stream by the pressure reducing valve 1132
The problem of adjustable valve 1133 controls aeration speed, not only can effectively solve the positive-pressure explosion-proof control cabinet 1 heat dissipation, and it is economical
Energy conservation.
Four, the present invention in the pressure relief opening 133 by being arranged the sparker 1131 and the explosion-proof relief valve
1133, not only it is avoided that spark or the evolution of hot particle, but also be avoided that in the positive-pressure explosion-proof control cabinet 1 that positive pressure is excessively high.
Five, it is alarmed by the abnormal alarm module 17 misoperation of the positive-pressure explosion-proof control cabinet 1, is realized
The timely discovery and exclusion of failure.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (2)
1. a kind of control method of positive-pressure explosion-proof control cabinet, the positive-pressure explosion-proof control cabinet includes gas supply module, pressure release module, control
Molding block, abnormal alarm module and power supply switching module, the gas supply module and the pressure release module cooperate to maintain positive pressure anti-
The intracavitary positive pressure of quick-fried control cabinet positive pressure, the control module are reported with the gas supply module, the pressure release module, the exception respectively
Alert module and power supply switching module electrical connection, the abnormal alarm module are used for the exception to the positive-pressure explosion-proof control cabinet
Operation is alarmed, and the power supply switching module is for controlling the intracavitary user's electrical system of the positive-pressure explosion-proof control cabinet positive pressure
Power supply, wherein
The gas supply module includes gas source preparation unit and supply unit, and the gas source preparation unit includes passing sequentially through pipeline company
Air compressor, cooling driers, filter device and the air accumulator connect, the supply unit include switch valve, pressure reducing valve, flow adjusting
Valve, supply air line, allocation component and multiple injection apparatus, the switch valve, the pressure reducing valve and flow control valve sequence
Set on the supply air line, the both ends of the supply air line are connected to the air accumulator and the allocation component respectively, and described point
The other end of distribution assembly is equipped with multiple shunting interfaces, and multiple shunting interfaces and multiple injection apparatus correspond and connect
It is logical；
The pressure release module includes exhaust outlet and pressure relief opening, and the exhaust outlet includes set on its internal flame-proof switch valve, institute
Stating pressure relief opening includes set on its internal sparker and explosion-proof relief valve；
The control module includes detector and programmable logic controller (PLC), the programmable logic controller (PLC) respectively with the inspection
Survey device, the gas supply module, the pressure release module, the abnormal alarm module and power supply switching module electrical connection；
The detector includes first pressure detector, second pressure detector, third pressure detector, temperature detector and gas
Body flow rate detector, and the first pressure detector is set in the air accumulator, the second pressure detector is set to described
In the supply air line between pressure reducing valve and the flow control valve, the third pressure detector and the temperature detector
Intracavitary set on the positive-pressure explosion-proof control cabinet positive pressure, the gas flow rate detector is set to the flow control valve and subtracts far from described
In the supply air line of the side of pressure valve；
The abnormal alarm module includes the abnormal alarm device being connected electrically, which is characterized in that the control method include with
Lower step:
Step 1: prepared by gas source: the compressed air of the air compressor is through the cooling processing of the cooling driers and the filtering
The air accumulator is stored in after the filtration treatment of device, the programmable logic controller (PLC) is examined according to the first pressure detector
Whether the air pressure signal control air compressor and the cooling driers measured in the air accumulator works；
Step 2: to the intracavitary gas supply of positive pressure of positive-pressure explosion-proof control cabinet: the programmable logic controller (PLC) described in control by opening
It closes valve and controls whether the air accumulator provides protective gas, the programmable logic controller (PLC) is detected according to the second pressure
Device, the third pressure detector, the temperature detector and the gas flow rate detector signal control the pressure reducing valve
With the flow control valve, pass through the gas supply to adjust supply gas pressure and gas supply speed, the air accumulator of the air accumulator
The positive pressure interacvity air-filling of pipeline, the allocation component and the injection apparatus to the positive-pressure explosion-proof control cabinet, the exhaust outlet
The intracavitary gas of the positive pressure that the positive-pressure explosion-proof control cabinet is discharged with the pressure relief opening；
Step 3: abnormal alarm: when detecting that the positive-pressure explosion-proof control cabinet is operating abnormally, the programmable logic controller (PLC)
The abnormal alarm device is controlled according to the misoperation signal detected and carries out warning note, and by controlling the power supply switching
The power supply of module cutting user's electrical system.
2. the control method of positive-pressure explosion-proof control cabinet according to claim 1, which is characterized in that positive pressure in the step 2
The intracavitary gas supply of the positive pressure of explosion proof control case specifically:
Purge mode when long, the positive pressure for the big protective gas of flow to be imported the positive-pressure explosion-proof control cabinet is intracavitary, with clear
Except its internal hazardous gas；
Leakage compensation mode, for being drawn with the protective gas compensation of small flow due to revealing after the completion of purge mode when described long
The positive-pressure explosion-proof control cabinet positive pressure cavity pressure risen reduces；And
Interval purge mode, for the leakage compensation mode after a period of work or/and under the leakage compensation mode
When the positive-pressure explosion-proof control cabinet positive pressure cavity temperature raising or/and hypotony, described in the big protective gas importing of flow
The positive pressure of positive-pressure explosion-proof control cabinet is intracavitary；
When described long after the completion of purge mode, the leakage compensation mode and the interval purge mode alternate run.
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| CN110032162A (en) * | 2018-04-18 | 2019-07-19 | 沈阳铝镁设计研究院有限公司 | A kind of DCS/PLC control cabinet and its application method with positive pressure |
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