CN203967726U - A kind of Overtemperature protection circuit - Google Patents
A kind of Overtemperature protection circuit Download PDFInfo
- Publication number
- CN203967726U CN203967726U CN201420269963.7U CN201420269963U CN203967726U CN 203967726 U CN203967726 U CN 203967726U CN 201420269963 U CN201420269963 U CN 201420269963U CN 203967726 U CN203967726 U CN 203967726U
- Authority
- CN
- China
- Prior art keywords
- major loop
- breaker
- loop
- shunt release
- control loop
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Thermally Actuated Switches (AREA)
Abstract
The utility model relates to a kind of Overtemperature protection circuit, comprises major loop and control loop; Described major loop comprises a heater; Described heater is directly connected three phase mains by major loop A.C. contactor with major loop circuit breaker; In described control loop, be provided with breaker shunt release; Described breaker shunt release connects major loop circuit breaker and controls its disconnection.The utility model has been cancelled the temperature protective device of major loop, utilizes control loop to increase a breaker shunt release, and the three-phase that not only can simultaneously control major loop cuts off; And can cut off timely main circuit power, fail safe is good.
Description
Technical field
The utility model relates to a kind of protective circuit, especially a kind of Overtemperature protection circuit.
Background technology
Thermal insulation cabinet is in the market associated in overtemperature prote switch series in major loop and control loop and realizes overheat protection function; But there are following two kinds of drawbacks in this control structure: 1, the operating temperature error of temperature protection switch is in the market ± 6 ℃, makes the action of 4 temperature protection switch inconsistent, the easy like this major loop three-phase imbalance that causes; 2, in use there is contact melted and release and can not let go in A.C. contactor, can not cut off in time main circuit power, causes device temperature to continue to raise.
Utility model content
The technical problems to be solved in the utility model is: provide a kind of security performance high and recoverable overtemperature prote switch.
The utility model solves the technical scheme that its technical problem adopts: a kind of Overtemperature protection circuit, comprises major loop and control loop; Described major loop comprises a heater; Described heater is directly connected three phase mains by major loop A.C. contactor with major loop circuit breaker; In described control loop, be provided with breaker shunt release; Described breaker shunt release is connected with major loop circuit breaker and controls its disconnection.
Specifically, control loop described in the utility model comprises two branch roads; One of them branch road comprises a protection switch and the control loop A.C. contactor of connecting with this protection switch; On described control loop A.C. contactor, be arranged in parallel auxiliary relay; The normally-closed contact of described another route breaker shunt release and auxiliary relay is composed in series; Described breaker shunt release is connected with major loop circuit breaker and controls its disconnection.
The beneficial effects of the utility model are, have solved the defect existing in background technology, have cancelled the temperature protective device of major loop, utilize control loop to increase a breaker shunt release, and the three-phase that not only can simultaneously control major loop cuts off; And can cut off timely main circuit power, fail safe is good.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is the utility model circuit theory diagrams;
Fig. 2 is the circuit theory diagrams of prior art;
In figure: QF1, circuit breaker; QF2, circuit breaker; KM1, A.C. contactor; FR1-4, temperature protection switch; KA1, auxiliary relay; QFD1, breaker shunt release.
Embodiment
With preferred embodiment, the utility model is described in further detail by reference to the accompanying drawings now.These accompanying drawings are the schematic diagram of simplification, basic structure of the present utility model is only described in a schematic way, so it only show the formation relevant with the utility model.
Shown in Fig. 2 is the circuit theory diagrams of the overtemperature prote switch of prior art; in figure; major loop and control loop are respectively arranged with temperature protection switch; during work; by A.C. contactor KM1, controlled the disconnection of temperature protection switch FR1, FR2, FR3, FR4, with this, cut off the object that main circuit power reaches protection.But because the operating temperature error of temperature protection switch is ± 6 ℃, so the work of each temperature protection switch not necessarily can be synchronous, so just easily cause the three-phase imbalance of major loop; And in use can there is contact and release situation about can not let go in A.C. contactor KM1, so just can not cut off in time main circuit power.
Shown in Fig. 1 is a kind of Overtemperature protection circuit described in the utility model, comprises major loop and control loop; Major loop comprises a heater; Heater is directly connected three-phase electricity by major loop A.C. contactor KM1 with major loop circuit breaker Q F1; Control loop comprises two branch roads; The control loop A.C. contactor KM1 that one of them branch road comprises a protection switch FR4 and connects with this protection switch; On control loop A.C. contactor KM1, be arranged in parallel auxiliary relay KA1; The normally-closed contact of another route breaker shunt release QFD1 and auxiliary relay KA1 is composed in series; Breaker shunt release QFD1 connects major loop circuit breaker Q F1 and controls its disconnection.
Like this, after the temperature protection switch FR4 action in control loop, KA1 auxiliary relay dead electricity, normally-closed contact adhesive, realizes overheat protection function thereby breaker shunt release QFD1 obtains electric control circuit breaker Q F1 cut-out major loop.
What in above specification, describe is embodiment of the present utility model, various not illustrating is construed as limiting flesh and blood of the present utility model, person of an ordinary skill in the technical field read after specification can to before described embodiment make an amendment or be out of shape, and do not deviate from essence and the scope of utility model.
Claims (2)
1. an Overtemperature protection circuit, is characterized in that: comprise major loop and control loop; Described major loop comprises a heater; Described heater is directly connected three phase mains by major loop A.C. contactor with major loop circuit breaker; In described control loop, be provided with breaker shunt release; Described breaker shunt release is connected with major loop circuit breaker and controls its disconnection.
2. a kind of Overtemperature protection circuit as claimed in claim 1, is characterized in that: described control loop comprises two branch roads; One of them branch road comprises a protection switch and the control loop A.C. contactor of connecting with this protection switch; On described control loop A.C. contactor, be arranged in parallel auxiliary relay; The normally-closed contact of described another route breaker shunt release and auxiliary relay is composed in series; Described breaker shunt release is connected with major loop circuit breaker and controls its disconnection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420269963.7U CN203967726U (en) | 2014-05-23 | 2014-05-23 | A kind of Overtemperature protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420269963.7U CN203967726U (en) | 2014-05-23 | 2014-05-23 | A kind of Overtemperature protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203967726U true CN203967726U (en) | 2014-11-26 |
Family
ID=51928270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420269963.7U Expired - Fee Related CN203967726U (en) | 2014-05-23 | 2014-05-23 | A kind of Overtemperature protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203967726U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108064090A (en) * | 2017-12-31 | 2018-05-22 | 广州市大弘自动化科技有限公司 | A kind of electric heating system |
| CN114498555A (en) * | 2022-02-11 | 2022-05-13 | 北大方正集团有限公司 | Prevent dry combustion method protection circuit |
-
2014
- 2014-05-23 CN CN201420269963.7U patent/CN203967726U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108064090A (en) * | 2017-12-31 | 2018-05-22 | 广州市大弘自动化科技有限公司 | A kind of electric heating system |
| CN114498555A (en) * | 2022-02-11 | 2022-05-13 | 北大方正集团有限公司 | Prevent dry combustion method protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141126 Termination date: 20210523 |