CN205070398U - Electric heating furnace's protection circuit - Google Patents
Electric heating furnace's protection circuit Download PDFInfo
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- CN205070398U CN205070398U CN201520757658.7U CN201520757658U CN205070398U CN 205070398 U CN205070398 U CN 205070398U CN 201520757658 U CN201520757658 U CN 201520757658U CN 205070398 U CN205070398 U CN 205070398U
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- voltage detecting
- electric furnace
- electric heating
- heating furnace
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Abstract
The utility model relates to an electric heating furnace's protection circuit contains three voltage detecting relay, it is three the coil one end of voltage detecting relay corresponds with three power phase line respectively to be connected, and the other end is connected with the zero line for whether detect has voltage output in the arbitrary power phase line, it is three the contact parallelly connected setting respectively of voltage detecting relay when having voltage output in the coil of an arbitrary voltage detecting relay detects corresponding power phase line, then makes to correspond contact motion control electric heating furnace outage, the utility model discloses a three voltage detecting relay detects the silicon controlled rectifier and is punctured to enable the electric heating furnace outage, reach protection electric heating furnace's purpose.
Description
Technical field
The utility model relates to air separation field, refers in particular to a kind of protective circuit of electric furnace.
Background technology
The purifier of air separation equipment needs supporting electric furnace; in order to reach energy-conservation order ground; usual employing controllable silicon regulable control; but in practical operation; easily short circuit is caused afterwards because controllable silicon punctures; heating furnace dry combustion method or cable is caused to burn; produce to air separation and impact; even threaten personal safety; for this reason, we have developed a kind of protective circuit of electric furnace, detect controllable silicon by breakdown by three voltage detecting relays; and electric furnace power-off can be made, reach the object of protection electric furnace.
Utility model content
The utility model object is the protective circuit providing a kind of electric furnace in order to overcome the deficiencies in the prior art, detects controllable silicon by breakdown, and can make electric furnace power-off, reach the object of protection electric furnace by three voltage detecting relays.
For achieving the above object, the technical solution adopted in the utility model is: a kind of protective circuit of electric furnace, comprises three voltage detecting relays; Coil one end of three described voltage detecting relays is corresponding with three power supply phase lines respectively to be connected, and whether the other end is connected with zero line, have voltage to export for detecting in any power supply phase line; The contact of three described voltage detecting relays is arranged in parallel respectively, when the Coil Detector of any one voltage detecting relay has voltage to export in corresponding power supply phase line, then makes the action control electric furnace power-off of corresponding contact.
Preferably, the collateral contact of three described voltage detecting relays is also arranged in series with enabling signal.
Due to the utilization of technique scheme, the utility model compared with prior art has following advantages:
The protective circuit of electric furnace described in the utility model detects controllable silicon by breakdown by three voltage detecting relays, and can make electric furnace power-off, reach the object of protection electric furnace, and circuit is simple, uses more reliable and secure.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, technical solutions of the utility model are described further:
Accompanying drawing 1 is the circuit diagram of the protective circuit of electric furnace described in the utility model;
Accompanying drawing 2 is the control chart of the protective circuit of electric furnace described in the utility model;
Wherein: 1KA, 2KA, 3KA are voltage detecting relay; 4KA is enabling signal; F is the switch coil of electric furnace.
Embodiment
Below in conjunction with drawings and the specific embodiments, the utility model is described in further detail.
Accompanying drawing 1-2 is the protective circuit of electric furnace described in the utility model, comprises three voltage detecting relays; Coil one end of three described voltage detecting relays is corresponding with three power supply phase lines respectively to be connected, and whether the other end is connected with zero line, have voltage to export for detecting in any power supply phase line; The normally opened contact of three described voltage detecting relays is arranged in parallel respectively and is arranged in series with enabling signal, after enabling signal starts, when the Coil Detector of any one voltage detecting relay has voltage to export in corresponding power supply phase line, then make the action control electric furnace power-off of corresponding contact.
During use: every road power supply phase line is all connected with a controllable silicon; as long as when three voltage detecting relays have one to detect that voltage exports; then have at least the controllable silicon in a road power supply phase line breakdown; now the normally opened contact of three voltage detecting relays at least have one close; control the coil blackout of electric furnace switch; thus make electric furnace power-off, reach the object of protection electric furnace.
Due to the utilization of technique scheme, the utility model compared with prior art has following advantages:
The protective circuit of electric furnace described in the utility model detects controllable silicon by breakdown by three voltage detecting relays, and can make electric furnace power-off, reach the object of protection electric furnace, and circuit is simple, uses more reliable and secure.
Below be only embody rule example of the present utility model, protection range of the present utility model is not constituted any limitation.The technical scheme that all employing equivalents or equivalence are replaced and formed, all drops within the utility model rights protection scope.
Claims (2)
1. a protective circuit for electric furnace, is characterized in that: comprise three voltage detecting relays; Coil one end of three described voltage detecting relays is corresponding with three power supply phase lines respectively to be connected, and whether the other end is connected with zero line, have voltage to export for detecting in any power supply phase line; The contact of three described voltage detecting relays is arranged in parallel respectively, when the Coil Detector of any one voltage detecting relay has voltage to export in corresponding power supply phase line, then makes the action control electric furnace power-off of corresponding contact.
2. the protective circuit of electric furnace according to claim 1, is characterized in that: the collateral contact of three described voltage detecting relays is also arranged in series with enabling signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520757658.7U CN205070398U (en) | 2015-09-28 | 2015-09-28 | Electric heating furnace's protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520757658.7U CN205070398U (en) | 2015-09-28 | 2015-09-28 | Electric heating furnace's protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205070398U true CN205070398U (en) | 2016-03-02 |
Family
ID=55396907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520757658.7U Active CN205070398U (en) | 2015-09-28 | 2015-09-28 | Electric heating furnace's protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205070398U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105244843A (en) * | 2015-09-28 | 2016-01-13 | 苏州制氧机股份有限公司 | Protection circuit for electric heating furnace |
-
2015
- 2015-09-28 CN CN201520757658.7U patent/CN205070398U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105244843A (en) * | 2015-09-28 | 2016-01-13 | 苏州制氧机股份有限公司 | Protection circuit for electric heating furnace |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |