CN103334912B - Pressure gauge with electric contact control circuit - Google Patents
Pressure gauge with electric contact control circuit Download PDFInfo
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- CN103334912B CN103334912B CN201310289464.4A CN201310289464A CN103334912B CN 103334912 B CN103334912 B CN 103334912B CN 201310289464 A CN201310289464 A CN 201310289464A CN 103334912 B CN103334912 B CN 103334912B
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- Prior art keywords
- triode
- optoelectronic isolator
- pressure gauge
- electric contact
- control circuit
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Abstract
The present invention relates to a kind of pressure gauge with electric contact control circuit.Pressure gauge with electric contact is through supporting the use with electric device (as relay and frequency variator etc.), the shortcoming that this kind controls is to use Control can carry out electromagnetic interference to a whole set of control circuit, affect reliability and the measurement accuracy of control system, Safety performance is also lower.A kind of pressure gauge with electric contact control circuit, comprise pressure gauge with electric contact and solid-state relay, pressure gauge with electric contact comprises high voltage terminal, low voltage terminal and pressure switch, it is characterized in that: this control circuit also comprises optoelectronic isolator LQ1, optoelectronic isolator LQ2, diode D1, diode D2, electric capacity C1, triode Q1, triode Q2 and triode Q3, high voltage terminal is connected with the input cathode of optoelectronic isolator LQ1, and low voltage terminal is connected with optoelectronic isolator LQ2 input cathode.Control circuit of the present invention does not use relay, can set safety voltage scope, safe and reliable, and power consumption is few.
Description
Technical field
Patent of the present invention relates to instrument field, specifically a kind of pressure gauge with electric contact control circuit.
Background technique
Pressure gauge with electric contact is widely used in the industrial departments such as oil, chemical industry, metallurgy, electric power, machinery or the supporting middle various fluid medium pressures measured without explosion risk of electromechanical equipment.Usually, pressure gauge with electric contact through supporting the use with corresponding electric device (as relay and frequency variator etc.), can realize to controlled pressure system the object that automatically controls and transmit.Pressure gauge with electric contact conventional at present uses contactor and Control, pressure gauge with electric contact intermediate contact and lower bound contacting when ambient pressure reduces, main contactor is arrived through normally-closed contact, the coil of main contactor obtains electric adhesive, then normally opened contact is connected, make main contactor form self-hold circuit (at this moment because pressure increase pressure gauge with electric contact intermediate contact and lower bound contact are left), main contact switches on power supply pump work; When pressure increase is to setting pressure, pressure gauge with electric contact intermediate contact limits contacting with high, arrives relay coil, relay adhesive through auxiliary contact, and normally-closed contact disconnects main contactor releasing winding, and main contact disconnects and stopping to pump work power supply.
The shortcoming of this kind of method is to use Control can carry out electromagnetic interference to a whole set of control circuit, and affect reliability and the measurement accuracy of control system, power consumption and noise are comparatively large simultaneously, and Safety performance is also lower.
Summary of the invention
Technical problem to be solved by this invention is to provide and a kind ofly can overcomes existing control circuit causes electromagnetic interference to whole circuit pressure gauge with electric contact control circuit due to Control.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of pressure gauge with electric contact control circuit, comprise pressure gauge with electric contact and solid-state relay, described pressure gauge with electric contact comprises high voltage terminal, low voltage terminal and pressure switch, its specialization is: described control circuit comprises optoelectronic isolator LQ1, optoelectronic isolator LQ2, diode D1, diode D2, electric capacity C1, triode Q1, triode Q2 and triode Q3, described high voltage terminal is connected with the input cathode of optoelectronic isolator LQ1, the input anode of optoelectronic isolator LQ1 is connected with resistance R9, the collector electrode of optoelectronic isolator LQ1 output terminal is connected with the base stage of resistance R1 and triode Q1 respectively by Section Point, described low voltage terminal is connected with optoelectronic isolator LQ2 input cathode, the input anode contact resistance R8 of optoelectronic isolator LQ2, and the collector electrode of optoelectronic isolator LQ2 output terminal is connected with the base stage of resistance R2 and triode Q2 respectively by first node, described resistance R8 and resistance R9 is in parallel, and optoelectronic isolator LQ1 is all connected with pressure switch with the emitter of optoelectronic isolator LQ2 output terminal, the emitter that the collector electrode of described triode Q2 accesses Section Point and VCC, triode Q2 respectively by R1 and R3 meets GND by R7 and diode D2, the collector electrode of described triode Q1 accesses first node and VCC respectively by R2 and R4, the emitter of triode Q1 meets GND by R6 and diode D1, the emitter of triode Q1 accesses the base stage of triode Q3 by R5, the collector electrode access solid-state relay of triode Q3, its grounded-emitter connection, series capacitance C1 between VCC and GND.
The direct current VCC of this circuit is 10V-36V.
Compared with prior art, beneficial effect of the present invention is:
1. control circuit of the present invention does not use relay, and this circuit only needs 10V-36V direct current situations vacant voltage, and common safety voltage scope, lower than 36V, therefore can set safety voltage scope, safe and reliable during use;
2. this control circuit does not use relay, and therefore power consumption is few, does not substantially disturb, noise free, and can be widely used in the pressure system control of gas, liquid.
Accompanying drawing explanation
The present invention is described in detail below in conjunction with drawings and embodiments:
Fig. 1 is structural representation of the present invention.
In figure: 1. high voltage terminal, 2. low voltage terminal, 3. pressure switch, 4. solid-state relay, 5. pump, 6. first node, 7. Section Point.
Embodiment
As shown in Figure 1, a kind of pressure gauge with electric contact control circuit, comprise pressure gauge with electric contact and solid-state relay 4, pressure gauge with electric contact comprises high voltage terminal 1, low voltage terminal 2 and pressure switch 3, solid-state relay 4 is connected with VCC, control circuit comprises optoelectronic isolator LQ1, optoelectronic isolator LQ2, diode D1, diode D2, electric capacity C1, triode Q1, triode Q2 and triode Q3, high voltage terminal 1 is connected with the input cathode of optoelectronic isolator LQ1, the input anode of optoelectronic isolator LQ1 is connected with resistance R9, optoelectronic isolator LQ1 output terminal is by Section Point contact resistance R1, optoelectronic isolator LQ1 output terminal and electric contact pressure list catenation, low voltage terminal 2 is connected with optoelectronic isolator LQ2 input cathode, the input anode contact resistance R8 of optoelectronic isolator LQ2, described resistance R9 and described resistance R8 is in parallel, optoelectronic isolator LQ2 output terminal is connected with resistance R2 by first node 6, optoelectronic isolator LQ2 output terminal and electric contact pressure list catenation, the collector electrode of described triode Q2 accesses Section Point 7 and VCC respectively by R1 and R3, and the emitter of triode Q2 is by R7 and diode D2 ground connection, and the base stage of triode Q2 is connected with first node 6, the collector electrode of described triode Q1 accesses first node 6 and VCC respectively by R2 and R4, the emitter of triode Q1 meets GND by R6 and diode D1, the emitter of triode Q1 accesses the base stage of triode Q3 by R5, the collector electrode access solid-state relay 4 of triode Q3, its grounded-emitter connection, series capacitance C1 between VCC and GND.。
Working principle of the present invention is: under normal circumstances, and pressure switch 3 and the low voltage terminal 2 of pressure gauge with electric contact keep UNICOM, and electric current flows into from VCC end, via resistance R8, then through optoelectronic isolator LQ2, then gets back to GND through low voltage terminal 2.In the process, optoelectronic isolator LQ2 triggers, and after first node 6 place is communicated with, voltage reduces, resistance R1 place voltage raises, electric current, by resistance R3, resistance R1, Section Point 7, triode Q1, triode Q3 and diode D1, is opened solid-state relay 4 and pump 5, is made it start working.Along with the work of pump 5, ambient pressure increases gradually, pressure switch 3 swings to high voltage terminal 1 gradually, when ambient pressure arrives the setting value of pressure gauge with electric contact, pressure switch 3 is communicated with high voltage terminal 1, electric current flows into from VCC end via resistance R9, optoelectronic isolator LQ1 triggers, after Section Point 7 tunnel is communicated with, voltage reduces, right side optoelectronic isolator LQ2 disconnects, and resistance R2 place voltage raises, and pump 5 quits work, electric current gets back to GND through R2, first node 6, Q2, R7, D2, and triode Q1 and Q3 enters cut-off state.When system pressure declines, pressure switch 3 swings to low voltage terminal 2 gradually, and when ambient pressure arrives the setting value of pressure gauge with electric contact, pressure switch 3 is communicated with low voltage terminal 2, circulates and so forth, realizes the control of pressure gauge with electric contact, thus realizes the control to pump 5.
Claims (2)
1. a pressure gauge with electric contact control circuit, comprise pressure gauge with electric contact and solid-state relay (4), described pressure gauge with electric contact comprises high voltage terminal (1), low voltage terminal (2) and pressure switch (3), it is characterized in that: described control circuit comprises optoelectronic isolator LQ1, optoelectronic isolator LQ2, diode D1, diode D2, electric capacity C1, triode Q1, triode Q2 and triode Q3, described high voltage terminal (1) is connected with the input cathode of optoelectronic isolator LQ1, the input anode of optoelectronic isolator LQ1 is connected with resistance R9, the collector electrode of optoelectronic isolator LQ1 output terminal is connected with the base stage of resistance R1 and triode Q1 respectively by Section Point (7), described low voltage terminal (2) is connected with optoelectronic isolator LQ2 input cathode, the input anode contact resistance R8 of optoelectronic isolator LQ2, and the collector electrode of optoelectronic isolator LQ2 output terminal is connected with the base stage of resistance R2 and triode Q2 respectively by first node (6), described resistance R8 and resistance R9 is in parallel, and optoelectronic isolator LQ1 is all connected with pressure switch (3) with the emitter of optoelectronic isolator LQ2 output terminal, the emitter that the collector electrode of described triode Q2 accesses Section Point (7) and VCC, triode Q2 respectively by R1 and R3 meets GND by R7 and diode D2, the collector electrode of described triode Q1 accesses first node (6) and VCC respectively by R2 and R4, the emitter of triode Q1 meets GND by R6 and diode D1, the emitter of triode Q1 accesses the base stage of triode Q3 by R5, collector electrode access solid-state relay (4) of triode Q3, its grounded-emitter connection, series capacitance C1 between VCC and GND.
2. pressure gauge with electric contact control circuit according to claim 1, is characterized in that: the direct current VCC of this circuit is 10V-36V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310289464.4A CN103334912B (en) | 2013-07-11 | 2013-07-11 | Pressure gauge with electric contact control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310289464.4A CN103334912B (en) | 2013-07-11 | 2013-07-11 | Pressure gauge with electric contact control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN103334912A CN103334912A (en) | 2013-10-02 |
| CN103334912B true CN103334912B (en) | 2015-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310289464.4A Expired - Fee Related CN103334912B (en) | 2013-07-11 | 2013-07-11 | Pressure gauge with electric contact control circuit |
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| Country | Link |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103557147A (en) * | 2013-10-14 | 2014-02-05 | 沈阳化工大学 | Mechanical hydraulic induction booster pump control device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10107608A (en) * | 1996-09-27 | 1998-04-24 | Sharp Corp | Light receiving section for photocoupling element |
| CN2924929Y (en) * | 2006-06-27 | 2007-07-18 | 杭州电子科技大学 | Multi-point control switch |
| CN201884258U (en) * | 2010-10-11 | 2011-06-29 | 盐城师范学院 | Automatic control electronic switch of air compressor |
| CN102158213A (en) * | 2011-04-22 | 2011-08-17 | 河海大学 | DC solid-state relay |
| CN203362479U (en) * | 2013-07-11 | 2013-12-25 | 西安工业大学 | Electric contact pressure gauge control circuit |
-
2013
- 2013-07-11 CN CN201310289464.4A patent/CN103334912B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10107608A (en) * | 1996-09-27 | 1998-04-24 | Sharp Corp | Light receiving section for photocoupling element |
| CN2924929Y (en) * | 2006-06-27 | 2007-07-18 | 杭州电子科技大学 | Multi-point control switch |
| CN201884258U (en) * | 2010-10-11 | 2011-06-29 | 盐城师范学院 | Automatic control electronic switch of air compressor |
| CN102158213A (en) * | 2011-04-22 | 2011-08-17 | 河海大学 | DC solid-state relay |
| CN203362479U (en) * | 2013-07-11 | 2013-12-25 | 西安工业大学 | Electric contact pressure gauge control circuit |
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| CN103334912A (en) | 2013-10-02 |
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