CN201464111U - Contact electric protective device of electric contact pressure gauge - Google Patents
Contact electric protective device of electric contact pressure gauge Download PDFInfo
- Publication number
- CN201464111U CN201464111U CN2009201167497U CN200920116749U CN201464111U CN 201464111 U CN201464111 U CN 201464111U CN 2009201167497 U CN2009201167497 U CN 2009201167497U CN 200920116749 U CN200920116749 U CN 200920116749U CN 201464111 U CN201464111 U CN 201464111U
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- contact
- pressure gauge
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- circuit
- electric
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Abstract
Disclosed is a contact electric protective device of an electric contact pressure gauge. The protective device comprises a mechanical structure and an electric portion consisting of a power source portion, an input portion, a signal processing portion, an output portion and a signal displaying portion; an electronic switch capable of realizing completely electrical isolation is disposed between the signal processing portion and the output portion; the power source portion includes a transformer, a rectifying diode, an integrated voltage stabilizing chip and a capacitor; the output portion is outputted to an external circuit through a non-contact bidirectional controllable silicon; the input portion includes an upper limit circuit and a lower limit circuit; an upper limit contact switch, an upper connection resistor and a pull-down resistor are disposed in the upper limit circuit; and a lower limit contact switch, another upper connection resistor and another pull-down resistor are arranged in the lower limit circuit. As current flowing through an electric contact is relatively small, the protective device can prolong the service life of a contact of the electric contact pressure gauge, and no malfunction occurs when the contact is in poor contact. Most importantly, the protective device enables the electric contact pressure gauge to have strong capacity of resisting disturbance to the external circuit, and guarantees work reliability.
Description
Technical field
The utility model relates to a kind of device that is used for electro connecting pressure gauge, particularly relates to a kind of electro connecting pressure gauge contact electronic protection.
Background technology
Electro connecting pressure gauge is the positive/negative pressure that is used for measurement gas, liquid medium, and sends signal when pressure reaches predetermined value, connects control circuit, reaches the purpose of the warning of automatic control.Existing a kind of high capacity electro connecting pressure gauge contact protection mechanism generally is installed on tensimeter inside; its electric part is by rectifier power source on original physical construction; the electric contact circuit; trigger flip-flop; on-off circuit and indicating circuit are formed; this tensimeter is directly controlled external circuit by original electric contact and is changed electric contact into by trigger flip-flop and amplifying circuit pilot relay; therefore; the electric current that flows through electric contact is very little; be difficult for producing spark; prolonged electro connecting pressure gauge contact serviceable life; but be easy to generate misoperation during this tensimeter poor contact of contacts; and control circuit directly links to each other with output; poor anti-interference, outside forceful electric power line fault is damaged internal control circuit easily.
The utility model content
The utility model provides a kind of electro connecting pressure gauge contact electronic protection, has solved when electro connecting pressure gauge uses because the problem of outside forceful electric power circuit interference electro connecting pressure gauge operate as normal.
Electro connecting pressure gauge contact electronic protection; comprise physical construction and electric part; wherein electric part comprises power unit, importation, signal processing, output and signal display part; be provided with the electronic switch that to realize complete electrical isolation between described signal processing and the output; this general electronic switch is meant photoelectrical coupler, and described signal processing comprises two Sheffer stroke gates that are cascaded and at least one current-limiting resistance.
In the utility model technique scheme owing between signal processing and output, be provided with the photoelectrical coupler that can realize electrical isolation, when signal processing output high level, the photoelectrical coupler conducting, because the electrical isolation effect of photoelectrical coupler, the electric signal transmission has one-way, output signal does not have influence to input end, thereby has good electrical isolation capabilities and antijamming capability, improves the reliable operation letter.
As preferably, described physical construction comprises mainboard, display board, shell and is connected base, wherein power unit, signal processing and output are installed on the described mainboard, and the signal display part is installed on the described display board, and the importation is installed on the described connection base.
As preferably, described output is to output to external circuit by contactless bidirectional triode thyristor, has used bidirectional triode thyristor to be connected with external circuit as terminal in this technical scheme, has the effect of circuit in the protection, increases the service life.
As further preferred, described importation comprises two control circuits, wherein one is upper limit circuit, another is the lower limit circuit, be provided with upper limit contact switch in the upper limit circuit, last connecting resistance and pull down resistor, be provided with the lower limit contact switch in the lower limit circuit, last connecting resistance and pull down resistor, in other words, in this technical scheme when extraneous operating voltage is specified numerical value greater than certain, just connect upper limit circuit, when extraneous operating voltage is specified numerical value less than this, just connect the lower limit circuit. when upper limit contact switch is closed, signal processing circuit obtains a high level, because the input impedance of pull down resistor is very big, even the loose contact of upper limit contact switch produces contact resistance, but the resistance of contact resistance still is far smaller than pull down resistor, the resistance of general pull down resistor is greater than 30 kilo-ohms, thus still give high level of signal processing circuit, thus do not influence the electro connecting pressure gauge operate as normal.
As further preferred, described power unit comprises transformer, commutation diode, integrated voltage stabilizing chip, electric capacity, wherein transformer secondary output output comprises two groups of independently rectification circuits, wherein one group is last rectification circuit, rectification circuit under another is organized and is, the described rectification circuit of going up comprises four commutation diodes, the integrated voltage stabilizing chip of three filter capacitors and a voltage stabilizing output, described rectification circuit down comprises four commutation diodes and a filter capacitor, last rectification circuit is earlier through rectifies, carry out filtering through electric capacity then, after integrated voltage stabilizing chip voltage stabilizing output, its output voltage is very little, is generally 12VDC.
The utility model is installed on the electro connecting pressure gauge outside, has following beneficial effect:
1, is provided with the photoelectrical coupler of complete electrical isolation between its signal processing and the output, makes the electro connecting pressure gauge contact anti-interference effect be arranged outside forceful electric power pressing element.
2, by the terminal electronic switch of contactless bidirectional triode thyristor as output, further improved the anti-tampering effect and the serviceable life of electro connecting pressure gauge contact, the contact endurance of contactless bidirectional triode thyristor is 100,000 times to 1,500,000 times of international life-span.
3, owing to be provided with pull down resistor in the importation, its input impedance is big, generally greater than 30 kilo-ohms, even produce contact resistance during the electro connecting pressure gauge loose contact, also can not produce misoperation and influences the electro connecting pressure gauge operate as normal.
4, because the voltage stabilizing output voltage of power unit is little, when upper limit contact switch or lower limit contact switch were closed, the electric current that flows through the electro connecting pressure gauge contact can not produce contact electric arc less than 150uA, has improved the serviceable life of electro connecting pressure gauge contact.
Description of drawings
Fig. 1 is the circuit diagram that removes power unit in the utility model electric part;
Fig. 2 is the circuit diagram of power unit in the utility model electric part.
Among the above figure: a, power unit b, importation c, signal processing d, output e, signal display part
A1, transformer a2, commutation diode a3, integrated voltage stabilizing chip a4, electric capacity
B1, last connecting resistance b2, pull down resistor b3, upper limit contact switch b4, lower limit contact switch
C1, Sheffer stroke gate
D1, bidirectional triode thyristor
E1, upper limit pilot lamp
F, photoelectrical coupler
Embodiment
One, structure of the present utility model is formed
Referring to Fig. 1, Fig. 2, the utility model electro connecting pressure gauge contact electronic protection, comprise physical construction and electric part, wherein physical construction comprises mainboard, display board, shell and is connected base, and electric part comprises power unit a, importation b, signal processing c, output d and signal display part e; Power unit a comprises transformer a1, commutation diode a2, integrated voltage stabilizing chip a3, electric capacity a4; Importation b comprises two control circuits, wherein one is upper limit circuit, another is the lower limit circuit, be provided with upper limit contact switch b3 in the upper limit circuit, last connecting resistance b1 and pull down resistor b2, be provided with lower limit contact switch b4 in the lower limit circuit, go up connecting resistance b1 and pull down resistor b2, the resistance of last connecting resistance b1 is 1 kilo-ohm, and the resistance of pull down resistor b2 is 1 megaohm; Signal processing c comprises two Sheffer stroke gate c1 that are cascaded and at least one current-limiting resistance; Output d outputs to external circuit by contactless bidirectional triode thyristor d1; Be provided with the photoelectrical coupler f that can realize electrical isolation between signal processing c and the output d; Signal indicating section e comprises signal lamp e1 and current-limiting resistance. for another kind of structure of the present utility model is that to be provided with the electronic switch that can realize electrical isolation between signal processing c and output d be relay, relay equally also has the electrical isolation effect, thereby the interference that makes the electro connecting pressure gauge contact not pressed by outside forceful electric power, because the structure and the photoelectrical coupler f of relay are different, need to change in the circuit part certain structures, but those skilled in the art can understand and transform equally, just omits at this and has narrated.
Two, annexation of the present utility model and effect
Power unit a of the present utility model, signal processing c and output b are installed on the mainboard, and signal display part e is installed on the display board, and importation b is installed in and connects on the base.
Referring to Fig. 1, Fig. 2, a1 level of the transformer of power unit a of the present utility model is output as two groups of independently rectification circuits, wherein one group is last rectification circuit, rectification circuit under another is organized and is, last rectification circuit is through four commutation diode a2 rectification by a1 level output of transformer, wherein two commutation diodes are the forward conduction state, two other commutation diode is a reverse blocking state, commutation diode a2 back four electric capacity a4 of connection carry out the filtering to signal, last electric capacity a4 is connected on the integrated voltage stabilizing chip a3, integrated voltage stabilizing chip a3 is integrated by the CMOS of low-power consumption, and the output terminal of integrated voltage stabilizing chip a3 just is connected to the input end of importation b; Following its basic circuit structure of rectification circuit is identical with last rectification circuit, but only carries out filtering output through an electric capacity.Importation b of the present utility model is connected the output terminal of power unit a, importation b comprises two control circuits, wherein one is upper limit circuit, another is the lower limit circuit, be provided with upper limit contact switch b3 successively, go up connecting resistance b1 and pull down resistor b2 from input end in the upper limit circuit, because the input resistance of pull down resistor b2 is 1 megaohm, the resistance of contact resistance that produces when being far longer than poor contact of contacts and last connecting resistance b1 is so still export with high level when the electro connecting pressure gauge poor contact of contacts; Signal processing c of the present utility model is connected on the node of described connecting resistance b1 of going up and pull down resistor b2, signal processing c is provided with Sheffer stroke gate c1, current-limiting resistance, Sheffer stroke gate, current-limiting resistance successively from this node, so high level still is a high level after through two Sheffer stroke gate c1, low level is through still being low level after two Sheffer stroke gate c1.For the interference that guarantees that the electro connecting pressure gauge contact is not pressed by extraneous forceful electric power, between the output terminal of signal processing c of the present utility model and the utility model output d, be provided with the photoelectrical coupler f that can realize complete electrical isolation, because the electrical isolation effect of photoelectrical coupler f, the electric signal transmission has one-way, output signal does not have influence to input end, thereby have good electrical isolation capabilities and antijamming capability, improve the reliable operation letter.The input end of output d of the present utility model links to each other with the output terminal of photoelectrical coupler f, because output d adopts the terminal electronic switch of contactless bidirectional triode thyristor d1 as output d, further improved the anti-tampering effect and the serviceable life of electro connecting pressure gauge contact, the contact endurance of contactless bidirectional triode thyristor d1 is 100,000 times to 1,500,000 times of international life-span; The input end of signal indicating section e of the present utility model links to each other with another output terminal of photoelectrical coupler f.The circuit structure of lower limit circuit is identical with upper limit circuit.
Three, principle of work of the present utility model
Referring to Fig. 1, Fig. 2, the utility model is installed in the outside of electro connecting pressure gauge, the elementary input voltage of transformer a1 is 220VDC, secondary is independently 15VAC of two-stage, one group is carried out rectification through four commutation diode a2, carry out filtering by three electric capacity a4 again, carry out voltage stabilizing output by integrated voltage stabilizing chip a3 at last, its output voltage is 12VDC; Another group is through other four rectifies, carry out filtering by an electric capacity again. when the upper limit contact switch b3 of electro connecting pressure gauge disconnects, the output voltage of 12VDC and signal processing c disconnect, because pull down resistor b2 links to each other with two input pins of a Sheffer stroke gate c1, two input pins of Sheffer stroke gate c1 are low level, output pin is a high level, again by a Sheffer stroke gate, the level of its output is a low level, so not conducting of photoelectrical coupler f, thereby upper limit pilot lamp e1 does not light not conducting of bidirectional triode thyristor f; When the upper limit contact switch b3 of electro connecting pressure gauge closure, the output voltage of 12VDC is successively by upper limit contact switch b3, last connecting resistance b1, because the resistance of last connecting resistance b1 is 1 kilo-ohm, but the resistance of pull down resistor b2 is 1 megaohm, so two input pins of Sheffer stroke gate c1 are high level, output pin is a low level, even upper limit contact switch b3 loose contact, even if contact resistance reaches 30 kilo-ohms, because the resistance of pull down resistor b2 is 1 megaohm, so two input pin level of Sheffer stroke gate c1 are still near 12VDC, be high level, thereby can not influence operate as normal, by a Sheffer stroke gate, the level of its output still is a high level again, so photoelectrical coupler f conducting, upper limit pilot lamp e1 lights, photoelectrical coupler f output, thus driving bidirectional triode thyristor d1 conducting. the principle of work of lower limit circuit is similar.
Claims (7)
1. electro connecting pressure gauge contact electronic protection; comprise physical construction and electric part; wherein electric part comprises power unit (a), importation (b), signal processing (c), output (d) and signal display part (e); it is characterized in that: be provided with electronic switch between described signal processing (c) and the output (d), described electronic switch is with signal processing (c) and output (d) electrical isolation.
2. electro connecting pressure gauge according to claim 1 contact electronic protection; it is characterized in that: described physical construction comprises mainboard, display board, shell and is connected base; described power unit (a), signal processing (c) and output (d) are installed on the described mainboard; described signal display part (e) is installed on the described display board, and described importation (b) is installed on the described connection base.
3. electro connecting pressure gauge according to claim 1 contact electronic protection is characterized in that: the described electronic switch of complete electrical isolation of realizing is meant photoelectrical coupler (f).
4. electro connecting pressure gauge according to claim 1 contact electronic protection is characterized in that: described output (d) is to output to external circuit by contactless bidirectional triode thyristor (d1).
5. according to claim 1 or 4 described electro connecting pressure gauge contact electronic protections; it is characterized in that: described importation (b) comprises two control circuits; wherein one is upper limit circuit; another is the lower limit circuit; be provided with upper limit contact switch (b3) in the upper limit circuit; last connecting resistance (b1) and pull down resistor (b2) are provided with lower limit contact switch (b4), go up connecting resistance (b1) and pull down resistor (b2) in the lower limit circuit.
6. according to claim 1 or 4 described electro connecting pressure gauge contact electronic protections; it is characterized in that: described power unit (a) comprises transformer (a1); commutation diode (a2); integrated voltage stabilizing chip (a3); filter capacitor (a4); wherein the secondary output of transformer (a1) comprises two groups of independently rectification circuits; wherein one group is last rectification circuit; rectification circuit under another is organized and is; the described rectification circuit of going up comprises four commutation diodes (a2); the integrated voltage stabilizing chip (a3) of three filter capacitors (a4) and a voltage stabilizing output, described rectification circuit down comprises four commutation diodes (a2) and a filter capacitor (a4).
7. according to claim 1 or 4 described electro connecting pressure gauge contact electronic protections, it is characterized in that: signal processing (c) comprises two Sheffer stroke gates that are cascaded (c1) and at least one current-limiting resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201167497U CN201464111U (en) | 2009-03-28 | 2009-03-28 | Contact electric protective device of electric contact pressure gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201167497U CN201464111U (en) | 2009-03-28 | 2009-03-28 | Contact electric protective device of electric contact pressure gauge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201464111U true CN201464111U (en) | 2010-05-12 |
Family
ID=42391462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201167497U Expired - Lifetime CN201464111U (en) | 2009-03-28 | 2009-03-28 | Contact electric protective device of electric contact pressure gauge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201464111U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109186853A (en) * | 2018-08-27 | 2019-01-11 | 国网浙江省电力有限公司杭州供电公司 | The low pre-alarm monitoring device of gas pressure |
-
2009
- 2009-03-28 CN CN2009201167497U patent/CN201464111U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109186853A (en) * | 2018-08-27 | 2019-01-11 | 国网浙江省电力有限公司杭州供电公司 | The low pre-alarm monitoring device of gas pressure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100512 Effective date of abandoning: 20090328 |