CN1409182A - Micro pressure difference controller for positive pressure control system of anti-explosion control cabinet - Google Patents
Micro pressure difference controller for positive pressure control system of anti-explosion control cabinet Download PDFInfo
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- CN1409182A CN1409182A CN 01133530 CN01133530A CN1409182A CN 1409182 A CN1409182 A CN 1409182A CN 01133530 CN01133530 CN 01133530 CN 01133530 A CN01133530 A CN 01133530A CN 1409182 A CN1409182 A CN 1409182A
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- control system
- explosion
- positive pressure
- pressure
- switch board
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Abstract
A micro-differential pressure controller used for positive pressure control system of explosion proof control cabinet is composed of micro-differential pressure transducer, signal convertor, comparing control unit and power source, among which the micro-differential transducer is a diffused silicon one, the constant current is provided by an integrated body of constant current source element HL, a digital display is after the signal convertor. The transducer converts the air pressure difference between inside and outside the cabinet into the voltage signal Vi for the convertor input, and the convertor converts Vi into the standard voltage signal VH to be transmitted separately to the comparing control unit and the digital display.
Description
Technical field
The present invention relates to thermal meter, particularly a kind of elementary errors pressure-controlled device that is used for explosion-proof switch board positive pressure control system.
Background technology
In oil, chemical industry, electric power, pharmacy, dyestuff, spices, chemical fibre, coal, weaving, many fields such as military installations are opposite to the electrical equipment in the possibility explosion environment, and instrument and meter needs explosive-proof protector.The positive-pressure explosion-proof switch board is a kind of in the explosive-proof protector facility; be air (or nitrogen with cleaning; or indifferent gas) sends into switch board and form malleation; prevent that explosive mixed gas from entering in the frame; and the concentration of inflammable gas in the cabinet is reduced to below the inflammable-explosive concentration; can prevent that also easily firing dust enters in the cabinet, reaches explosion-proof purpose.
The malleation that forms in the switch board is realized by control system, generally all selects for use four diaphragm type elementary errors pressure-controlled devices to come source block as the signal of control system.Because the drift of diaphragm type elementary errors pressure-controlled device is bigger, repeatability is bad, and idol has the phenomenon of misoperation, and does not show, makes the field adjustable workload big, and the operator is difficult for grasping.
Summary of the invention
The purpose of this invention is to provide a kind of novel elementary errors pressure-controlled device replaces diaphragm type elementary errors controller to constitute the positive pressure control system of explosion-proof switch board.
Described minute-pressure controller is by diffuse si little differential pressure sensor (1), and signal converter (2) compares control module (3), and digital indicator (4) and power supply (5) are formed.Elementary errors sensor (1) becomes the voltage signal Vi that converter (2) is imported with the draught head inside and outside the cabinet, and converter (2) is converted to normal voltage signal V with Vi
H, give respectively comparison control module (3) and
Bit digital display (4).The air pressure difference that display (4) display case is inside and outside, relatively control module (3) is exported the upper limit (H) respectively, the upper limit (HH), lower limit (L) and following lower limit (LL), relatively control module (3) is relatively formed by four, four switching signals of its output are used for positive pressure control system, reach the technical requirement of positive-pressure explosion-proof switch board.
The present invention is a kind of low drift that has, good reproducibility, misoperation can not appear, controller with Presentation Function, with its explosion-proof switch board positive pressure control system that replaces diaphragm type minute-pressure controller to constitute, debugging is simple, handles easily, and its volume is little, can utilize significant spatial to increase in the switch board.
Description of drawings
Fig. 1 is a principle of the invention block diagram
Fig. 2 is signal converter of the present invention (2) and the electrical schematic diagram that compares control module (3).
(1) diffuse si micro-pressure sensor among the figure, (2) signal converter, (3) four compare control module, (4)
The bit digital display, (5) power supply.
Be signal converter (2) in the empty frame among Fig. 2, comprise integrated constant-current source device HL, operational amplifier IC1, IC2, IC3 and peripheral cell thereof, dotted line cabinet are outward four comparison control modules (3), by operational amplifier IC4, IC5, IC6, IC7 and peripheral cell thereof, four DC relay J1, J2, J3, the triode BG1 of J4 and driving relay, BG2, BG3, BG4 constitutes.
Embodiment
The course of work of the present invention is summarized as follows:
Integrated constant-current source device HL provides steady current to flow through diffuse si little differential pressure sensor (1) internal resistance bridge circuit, after little differential pressure sensor (1) is experienced explosion-proof switch board inner and outer air pressure difference, its bridge circuit out of trim, produce unbalance voltage Vi, Vi is by the IC1 of signal converter (3), IC2, IC3 are enlarged into normal voltage V
H, V
HGive
The bit digital display, the measured value of demonstration switch board inner and outer air pressure difference.V
HGive the IC4 of four comparison control modules (3) simultaneously, IC5, IC6, the end of oppisite phase of IC7 is compared with the reference mark setting voltage of their in-phase ends, by triode BG1, BG2, BG3, BG4 drive four relay J 1 respectively, J2, J3, J4, J1～J4 is powered by negative supply E_, thereby obtain the upper limit (H) and go up the upper limit (HH) and lower limit (L), four switching signals of following lower limit (LL).Positive pressure control system makes explosion-proof switch board inner and outer air pressure difference satisfy the requirement of operate as normal according to these four switching signals as the control signal source.The fixing reference mark setting voltage of in-phase end is by resistance in series R
a, R
b, R
c, R
dWith R
eDividing potential drop forms.
Claims (4)
1, the elementary errors pressure-controlled device that is used for explosion-proof switch board positive pressure control system, by little differential pressure sensor (1), signal converter (2), relatively control module (3) and power supply (5) are formed, it is characterized in that: said micro-pressure sensor is a kind of diffuse si little differential pressure sensor, provide steady current by integrated constant-current source device HL, be connected to a digital indicator (4) afterwards at signal converter (2); Said sensor (1) becomes the voltage signal Vi that converter (2) is imported with the draught head inside and outside the cabinet, and converter (2) is converted to normal voltage signal V with Vi
H, give comparison control module (3) and digital indicator (4) respectively.
2, according to the said elementary errors pressure-controlled device that is used for explosion-proof switch board positive pressure control system of claim 1, it is characterized in that: the air pressure difference that digital indicator (4) display case is inside and outside, relatively control module (3) is exported the upper limit (H) respectively, the upper limit (HH), lower limit (L) and following lower limit (LL), relatively control module (3) is relatively formed by four, and four switching signals of its output are used for positive pressure control system.
3, according to the said elementary errors pressure-controlled device that is used for explosion-proof switch board positive pressure control system of claim 1, it is characterized in that: four compare control module (3) by resistance in series R
a, R
b, R
c, R
d, R
eForm fixing reference mark setting value.
4, according to the said elementary errors pressure-controlled device that is used for explosion-proof switch board positive pressure control system of claim 1, it is characterized in that: the normal voltage signal V of converter (2) output
HGive the IC4 of four comparison control modules (3) simultaneously, IC5, IC6, the end of oppisite phase of IC7 is compared with the reference mark setting voltage of their in-phase ends, and by triode BG1, BG2, BG3, BG4 drive four relay J 1, J2, J3, J4 respectively; J1～J4 is powered by negative supply E_.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01133530 CN1409182A (en) | 2001-09-30 | 2001-09-30 | Micro pressure difference controller for positive pressure control system of anti-explosion control cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01133530 CN1409182A (en) | 2001-09-30 | 2001-09-30 | Micro pressure difference controller for positive pressure control system of anti-explosion control cabinet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1409182A true CN1409182A (en) | 2003-04-09 |
Family
ID=4671893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01133530 Pending CN1409182A (en) | 2001-09-30 | 2001-09-30 | Micro pressure difference controller for positive pressure control system of anti-explosion control cabinet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1409182A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7185543B2 (en) * | 2003-02-20 | 2007-03-06 | Fujikin Incorporated | Ultra-precision micro-differential pressure measuring device and ultra-precision differential pressure measuring device |
-
2001
- 2001-09-30 CN CN 01133530 patent/CN1409182A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7185543B2 (en) * | 2003-02-20 | 2007-03-06 | Fujikin Incorporated | Ultra-precision micro-differential pressure measuring device and ultra-precision differential pressure measuring device |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |