CN203813408U - A heater electronic protective device - Google Patents
A heater electronic protective device Download PDFInfo
- Publication number
- CN203813408U CN203813408U CN201420069398.XU CN201420069398U CN203813408U CN 203813408 U CN203813408 U CN 203813408U CN 201420069398 U CN201420069398 U CN 201420069398U CN 203813408 U CN203813408 U CN 203813408U
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- CN
- China
- Prior art keywords
- heater
- contactor
- gain
- electricity
- photoelectrical coupler
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- Expired - Fee Related
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Abstract
The utility model discloses a heater electronic protective device which is used for being connected into a three-phase power supply circuit of a heater. The heater three-phase power supply circuit is provided with alternating current contactors, an alternating current contactor electricity-gain and electricity-loss control circuit and three fuses which are respectively connected into three phases. The heater electronic protective device comprises an intermediate relay and intermediate relay electricity-gain and electricity-loss control circuits respectively connected with the both ends of the corresponding fuses. Each intermediate relay electricity-gain and electricity-loss control circuit comprises an optoelectronic coupler and optoelectronic coupler drive circuits. Two poles of each optoelectronic coupler drive circuit are connected with the two ends of the corresponding fuse. An output terminal of each optoelectronic coupler drive circuit is connected with the corresponding optoelectronic coupler. The three optoelectronic couplers are respectively connected again with coils of the intermediate relay before the three optoelectronic couplers are connected with a null line. A normally closed contact of each intermediate relay is connected in the alternating current contactor electricity-gain and electricity-loss control circuit so as to make a coil of the alternating current contactor to lose electric power when the normally closed contact is switched off. According to the heater electronic protective device of the utility model, open-phase protection can be carried out during three phase power supplying of the heater, and power supplying imbalance even burnout can be avoided.
Description
Technical field
The utility model relates to a kind of heater electronic protection.
Background technology
At present; in now increasing industrial occasions, need to use powerful heater; because heater is pure resistive loads; it is different from the motor of inductive load; in protective circuit, heater is cannot be with thermal relay as thermal protective element; conventionally all adopt fuse protection; but in use; even if one in heater three-phase mutually overcurrent occurs or short circuit makes fuse blows; other two-phases are still in heating; so just make heater three phase supply three-phase electricity that circuit supplies uneven, can not cut off main power source.
Summary of the invention
Technical problem to be solved in the utility model is the defect that overcomes prior art, and a kind of heater electronic protection is provided, it can be in heater three phase supply open-phase protection, avoid the phenomenon that heating installation power supply is uneven or even burn.
In order to solve the problems of the technologies described above, the technical solution of the utility model is: a kind of heater electronic protection, be used for being connected to heater three phase supply circuit, heater three phase supply circuit has A.C. contactor, A.C. contactor gain and loss electric control circuit and be connected to three fuses in three-phase, it comprises auxiliary relay and the auxiliary relay gain and loss electric control circuit being connected with corresponding fuse two ends respectively, auxiliary relay gain and loss electric control circuit comprises photoelectrical coupler and photoelectrical coupler drive circuit, the two poles of the earth of each photoelectrical coupler drive circuit are connected with the two ends of corresponding fuse, the output of each photoelectrical coupler drive circuit is connected with corresponding photoelectrical coupler, connecting to neutral line after three photoelectrical couplers are connected with the coil of auxiliary relay respectively again, the normally-closed contact of auxiliary relay is connected in A.C. contactor gain and loss electric control circuit while disconnecting with convenient normally-closed contact, the coil losing electricity of A.C. contactor.
Described photoelectrical coupler drive circuit comprises dropping resistor, half-wave rectifier and filtering capacitor, one end of dropping resistor is connected with one end of fuse, the other end of dropping resistor is connected with one end of half-wave rectifier, the other end of half-wave rectifier is connected with the other end of fuse after connecting filtering capacitor, and described photoelectrical coupler is connected in parallel on the two ends of filtering capacitor.
A.C. contactor gain and loss electric control circuit comprises the coil of start button switch, A.C. contactor and a normally opened contact of A.C. contactor, one end of described start button switch is connected with any one of heater three phase supply circuit, then the normally-closed contact that is connected to again auxiliary relay after the coil of the other end connection A.C. contactor of start button switch takes back zero line, and a normally opened contact of described A.C. contactor is connected in parallel on the two ends of start button switch.
Adopted after technique scheme, photoelectrical coupler is a kind of gate-controlled switch, its elementary inside is a light-emitting diode, after this pipe conducting is luminous, its photosensitive bidirectional thyristor in secondary will conducting, the first level led whether conducting of photoelectrical coupler is subject to the control of photoelectrical coupler drive circuit, and whether this photoelectrical coupler drive circuit works, whether fuse relevant with fuse, during fusing, just can shield, each bidirectional thyristor in secondary controlled auxiliary relay coil dead electricity, and auxiliary relay coil dead electricity is being controlled the current circuit of ac contactor coil, after every fuse blows going up mutually, and then can make auxiliary relay coil obtain electric work, its normally-closed contact disconnects, thereby cut off the power supply of the coil of A.C. contactor, whole contacts of its A.C. contactor all disconnect, thereby realized the object of open-phase protection, avoided the phenomenon that heating installation power supply is uneven or even burn.
Accompanying drawing explanation
Fig. 1 is the electrical connection schematic diagram of heater electronic protection of the present utility model.
Embodiment
For content of the present utility model is more easily expressly understood, according to specific embodiment also by reference to the accompanying drawings, the utility model is described in further detail below,
As shown in Figure 1, a kind of heater electronic protection, be used for being connected to heater three phase supply circuit, heater three phase supply circuit has A.C. contactor KM1, A.C. contactor gain and loss electric control circuit and be connected to three fuse FU1 in three-phase, FU2 and FU3, three groups of main normally opened contacts of A.C. contactor KM1 are connected in three-phase, concrete structure as shown in Figure 1, heater electronic protection comprise auxiliary relay KA1 and respectively with corresponding fuse FU1, the auxiliary relay gain and loss electric control circuit that the two ends of FU2 and FU3 are connected, auxiliary relay gain and loss electric control circuit comprises photoelectrical coupler IC1, IC2, IC3 and photoelectrical coupler drive circuit, the two poles of the earth of each photoelectrical coupler drive circuit and corresponding fuse FU1, FU2, the two ends of FU3 are connected, the output of each photoelectrical coupler drive circuit and corresponding photoelectrical coupler IC1, IC2, IC3 is connected, three photoelectrical coupler IC1, IC2, connecting to neutral line N after IC3 is connected with the coil of auxiliary relay KA1 respectively again, the normally-closed contact of auxiliary relay KA1 is connected in A.C. contactor gain and loss electric control circuit while disconnecting with convenient normally-closed contact, the coil losing electricity of A.C. contactor KM1.
Photoelectrical coupler drive circuit has three groups, gets a wherein example, and all the other annexations are all identical with this example, and first group of photoelectrical coupler drive circuit comprises dropping resistor R1, half-wave rectifier VD1; With filtering capacitor C1, one end of dropping resistor R1 is connected with one end of fuse FU1, the other end of dropping resistor R1 is connected with one end of half-wave rectifier VD1, the other end of half-wave rectifier VD1 is connected with the other end of fuse FU1 after connecting filtering capacitor C1, and described photoelectrical coupler IC1 is connected in parallel on the two ends of filtering capacitor C1.
A.C. contactor gain and loss electric control circuit comprises the coil of start button switch 1SA, A.C. contactor KM1 and a normally opened contact of A.C. contactor KM1, one end of described start button switch 1SA is connected with any one of heater three phase supply circuit, then the normally-closed contact that is connected to again auxiliary relay KA1 after the coil of the other end connection A.C. contactor KM1 of start button switch 1SA takes back zero line N, and a normally opened contact of described A.C. contactor KM1 is connected in parallel on the two ends of start button switch 1SA.
Three auxiliary relay gain and loss electric control circuits can adopt printed circuit board (PCB) welding, and volume is little, and shell can be made DIN rail module formula and install, and facilitates wiring maintenance etc.
Operation principle of the present utility model is as follows:
As shown in Figure 1, L1-L3 three-phase alternating-current supply is added on three groups of main contactss of A.C. contactor KM1, after work for three-phase heater provides three-phase current, L1 or L2 or L3 are the power supply of A.C. contactor gain and loss electric control circuit, for start and stop, after pressing start button switch 1SA, A.C. contactor KM1 coil obtains electric adhesive, and heater three phase supply circuit turn-on, for heater provides three phase mains, obtains it electric, the normally opened contact self-locking of one group of A.C. contactor KM1, after start button switch 1SA is unclamped, the coil of A.C. contactor KM1 keeps power supply, makes heater maintain operation heated condition, during normal work, the voltage at FU1-FU3 fuse two ends reduces to 0, therefore IC1-IC3 is all in cut-off state, after any phase fuse blows, the fuse FU1 of take in L1 is example, L1 phase power supply is through dropping resistor R1 step-down, half-wave rectifier VD1 halfwave rectifier, filtering capacitor C1 capacitor filtering, will make the interior light-emitting diode conducting of IC1 luminous, its inner bidirectional thyristor will conducting, and then the coil that makes auxiliary relay KA1 obtains electric work, its normally-closed contact disconnects, thereby cut off the power supply of A.C. contactor KM1 coil, the whole contacts of its KM1 all disconnect, thereby realized the object of open-phase protection.
Above-described specific embodiment; technical problem, technical scheme and beneficial effect that the utility model is solved further describe; institute is understood that; the foregoing is only specific embodiment of the utility model; be not limited to the utility model; all within spirit of the present utility model and principle, any modification of making, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (3)
1. a heater electronic protection, be used for being connected to heater three phase supply circuit, heater three phase supply circuit has A.C. contactor, A.C. contactor gain and loss electric control circuit and be connected to three fuses in three-phase, it is characterized in that: it comprises auxiliary relay and the auxiliary relay gain and loss electric control circuit being connected with corresponding fuse two ends respectively, auxiliary relay gain and loss electric control circuit comprises photoelectrical coupler and photoelectrical coupler drive circuit, the two poles of the earth of each photoelectrical coupler drive circuit are connected with the two ends of corresponding fuse, the output of each photoelectrical coupler drive circuit is connected with corresponding photoelectrical coupler, connecting to neutral line after three photoelectrical couplers are connected with the coil of auxiliary relay respectively again, the normally-closed contact of auxiliary relay is connected in A.C. contactor gain and loss electric control circuit while disconnecting with convenient normally-closed contact, the coil losing electricity of A.C. contactor.
2. heater electronic protection according to claim 1; it is characterized in that: described photoelectrical coupler drive circuit comprises dropping resistor, half-wave rectifier and filtering capacitor; one end of dropping resistor is connected with one end of fuse; the other end of dropping resistor is connected with one end of half-wave rectifier; the other end of half-wave rectifier is connected with the other end of fuse after connecting filtering capacitor, and described photoelectrical coupler is connected in parallel on the two ends of filtering capacitor.
3. heater electronic protection according to claim 1 and 2; it is characterized in that: A.C. contactor gain and loss electric control circuit comprises the coil of start button switch, A.C. contactor and a normally opened contact of A.C. contactor; one end of described start button switch is connected with any one of heater three phase supply circuit; then the normally-closed contact that is connected to again auxiliary relay after the coil of the other end connection A.C. contactor of start button switch takes back zero line, and a normally opened contact of described A.C. contactor is connected in parallel on the two ends of start button switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420069398.XU CN203813408U (en) | 2014-02-18 | 2014-02-18 | A heater electronic protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420069398.XU CN203813408U (en) | 2014-02-18 | 2014-02-18 | A heater electronic protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203813408U true CN203813408U (en) | 2014-09-03 |
Family
ID=51452117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420069398.XU Expired - Fee Related CN203813408U (en) | 2014-02-18 | 2014-02-18 | A heater electronic protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203813408U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746334A (en) * | 2014-02-18 | 2014-04-23 | 常州江南电力环境工程有限公司 | Electronic protection device for heater |
| CN110086155A (en) * | 2019-06-11 | 2019-08-02 | 云南电网有限责任公司电力科学研究院 | A kind of triggering quick harmonic elimination apparatus of three-phase certainly |
-
2014
- 2014-02-18 CN CN201420069398.XU patent/CN203813408U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746334A (en) * | 2014-02-18 | 2014-04-23 | 常州江南电力环境工程有限公司 | Electronic protection device for heater |
| CN110086155A (en) * | 2019-06-11 | 2019-08-02 | 云南电网有限责任公司电力科学研究院 | A kind of triggering quick harmonic elimination apparatus of three-phase certainly |
| CN110086155B (en) * | 2019-06-11 | 2021-09-24 | 云南电网有限责任公司电力科学研究院 | A self-triggering three-phase fast harmonic elimination device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160129 Address after: 213022 No. 159 Hanjiang West Road, Xinbei District, Jiangsu, Changzhou Patentee after: CHANGZHOU JIANGNAN ENVIRONMENTAL PROTECTION EQUIPMENT CO., LTD. Address before: 213245 Jiangsu city in Changzhou Province, Jintan City Industrial Zone Xue Bu Zhen Patentee before: Changzhou Jiangnan Electric Power Environmental Engineering Co., Ltd. |
|
| 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: 20140903 Termination date: 20160218 |