CN213071042U - Overload alarm non-tripping device for temperature control type molded case circuit breaker - Google Patents
Overload alarm non-tripping device for temperature control type molded case circuit breaker Download PDFInfo
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- CN213071042U CN213071042U CN202022351360.XU CN202022351360U CN213071042U CN 213071042 U CN213071042 U CN 213071042U CN 202022351360 U CN202022351360 U CN 202022351360U CN 213071042 U CN213071042 U CN 213071042U
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- circuit breaker
- potsherd
- case circuit
- overload alarm
- tripping device
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Abstract
The utility model relates to a temperature control type moulded case circuit breaker overload alarm does not trip gear, including the current output terminal, install quiet iron core and heating element on the current output terminal, install heat conduction insulating part on the heating element, install thermistor in the heat conduction insulating part, thermistor connecting signal line, signal line connection director, heating element and flexible coupling are connected. The utility model discloses have the short-circuit protection function, compact structure saves space, adopts temperature monitoring's mode real-time supervision heating element temperature, and whether feedback major loop current transships ensures that the circuit breaker does not drop and accurate output alarm signal.
Description
Technical Field
The utility model belongs to the technical field of the thermomagnetic formula moulded case circuit breaker, a temperature control type moulded case circuit breaker overload alarm does not trip gear.
Background
Generally speaking, the overload trip prevention function of the thermomagnetic molded case circuit breaker is realized by driving a signal change-over switch through a thermal bimetallic element. The parts are more, the structure is relatively complex and the occupied space is large.
Disclosure of Invention
An object of the utility model is to provide a temperature control type moulded case circuit breaker overload alarm does not trip gear, can solve former device part more, the structure is complicated relatively and the big problem of occupation space.
According to the utility model provides a technical scheme: the utility model provides a temperature control type moulded case circuit breaker overload alarm does not trip gear, includes current output terminal, install quiet iron core and thermoelement on the current output terminal, install heat conduction insulating part on the thermoelement, install thermistor in the heat conduction insulating part, thermistor connects the signal line, signal line connection director, the thermoelement is connected with the flexible coupling.
As a further improvement of the present invention, the controller is mounted on the circuit breaker housing.
As a further improvement of the present invention, the current output terminal and the stationary core are fixed by riveting with a first rivet.
As a further improvement of the present invention, the current output terminal and the heat element are fixed by riveting with a second rivet.
As a further improvement of the present invention, the thermal element is connected to the flexible connection by welding.
As a further improvement of the utility model, the flexible connection is made of copper.
As a further improvement of the utility model, the heat conducting insulating part is a ceramic part.
As a further improvement of the utility model, the heat conduction insulating part is a heat conduction silica gel part.
As a further improvement of the utility model, the pottery piece includes first potsherd and second potsherd, first potsherd and second potsherd are half chamber structures, the heating element with first potsherd with the second potsherd is by the screw connection, first potsherd with second potsherd intracavity is equipped with thermistor, first potsherd with the second potsherd side is opened there is the export, signal line one end is connected thermistor, the other end passes the exit linkage the controller.
The positive progress effect of this application lies in:
1. the utility model discloses have the short-circuit protection function, compact structure saves space.
2. The utility model discloses a mode real-time supervision heating element temperature of temperature monitoring, whether the feedback main loop current transships, ensures that the circuit breaker does not drop off and accurate output alarm signal.
3. The utility model discloses the function is reliable.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of the structure assembly of the present invention.
Fig. 3 is a circuit diagram of the controller of the present invention.
Detailed Description
The following description will further describe embodiments of the present invention with reference to the accompanying drawings.
In fig. 1-3, the device comprises a current output terminal 1, a static iron core 2, a first rivet 3, a second rivet 4, a thermal element 5, a screw 6, a first ceramic piece 7, a second ceramic piece 8, a thermistor 9, a flexible connection 10, a signal line 11, a controller 12 and the like.
As shown in fig. 1-2, the utility model relates to a temperature control type moulded case circuit breaker overload alarm does not trip gear, including current output terminal 1, current output terminal 1 and quiet iron core 2 are through first rivet 3 riveting, and current output terminal 1 and hot component 5 are through second rivet 4 riveting, are equipped with the screw hole on the hot component 5, and hot component 5 is fastened by screw 6 with first potsherd 7 and second potsherd 8. A thermistor 9 is arranged in a cavity formed by the lower ends of the first ceramic plate 7 and the second ceramic plate 8 after being fastened by the screw 6. The thermistor 9 is connected to a signal line 11, and the signal line 11 is connected to a controller 12. The lower end of the heating element 5 is connected with a flexible connection (copper strip) 10 by welding. The controller 12 is mounted on the circuit breaker housing.
The utility model provides a temperature control type moulded case circuit breaker overload alarm does not trip gear is welded by flexible coupling 10 and is inserted moulded case circuit breaker main loop, and under the overload condition did not take place for the electric current in the circuit, the electric current got into this device through 10, and the electric current flows out from current output terminal 1 through hot component 5, and the electric current passes through hot component 5, and hot component 5 generates heat a small amount, and heat-conduction is to first potsherd 7 and second potsherd 8 with the laminating of hot component 5. The first ceramic plate 7 and the second ceramic plate 8 have good heat conducting properties and insulating properties. And the thermistor 9 arranged in the lower end cavities of the first ceramic plate 7 and the second ceramic plate 8 outputs temperature signals. And the temperature value is transmitted to the controller 12 through the signal wire 11, and the temperature value does not reach the set alarm temperature value at the moment. The controller 12 judges that the current in the circuit is not overloaded according to the signal and does not give an alarm.
When the current in the current is overloaded, the current passes through the heat element 5, so that the heat element 5 generates more heat, and the heat is conducted to the first ceramic plate 7 and the second ceramic plate 8 which are jointed with the heat element 5. The thermistor 9 arranged in the lower end cavities of the first ceramic plate 7 and the second ceramic plate 8 outputs temperature signals. The temperature value reaches the set alarm value, the controller 12 judges that the current in the circuit is overloaded according to the temperature signal, and the alarm is given immediately.
When a short circuit occurs in the circuit, the static iron core 2 provides a magnetic field required by the action of the movable iron core of the circuit breaker.
As shown in fig. 3, the circuit of the controller 12 of the present invention includes a first reference voltage circuit, a second reference voltage circuit, a resistor R3, a thermistor RP1, resistors R5, R8, an operational amplifier U1B, an operational amplifier U2A, a diode D3, an operational amplifier U2B, a resistor R12, an NPN transistor Q1, a diode D4, and a relay K1;
in the embodiment, the thermosensitive element RP1 is a negative temperature coefficient thermosensitive element;
one end of the resistor R3 is connected with a positive voltage VCC, the other end of the resistor R5 is connected with one end of the thermosensitive element RP1, and the other end of the thermosensitive element RP1 is grounded; the other end of the resistor R5 is connected with the inverting input end of the operational amplifier U1B and one end of the resistor R8, the output end of the operational amplifier U1B is connected with the other end of the resistor R8 and is connected with the non-inverting input end of the operational amplifier U2A through a diode D2 arranged in the forward direction or directly; the non-inverting input of the operational amplifier U1B is connected with a first reference voltage Vref 1;
in this embodiment, the first reference voltage Vref1 is generated by a first reference voltage circuit; the first reference voltage circuit comprises resistors R1 and R2, an operational amplifier U1A, and resistors R6 and R7; one end of the resistor R1 is connected with a positive voltage VCC, the other end of the resistor R1 is connected with one end of a resistor R2 and the non-inverting input end of the operational amplifier U1A, and the other end of the resistor R2 is grounded; the inverting input end of the operational amplifier U1A is connected with the output end of the U1A and one end of the resistor R6, the other end of the resistor R6 is connected with one end of the resistor R7, and a first reference voltage Vref1 is obtained and is connected with the non-inverting input end of the operational amplifier U1B; the other end of the resistor R7 is grounded;
the inverting input end of the operational amplifier U2A is connected with a second reference voltage Vref2, the output end of the operational amplifier U2A is connected with the cathode of a diode D3, and the anode of the diode D3 is connected with the non-inverting input end of the operational amplifier U2B;
in this embodiment, the second reference voltage Vref2 is generated by a second reference voltage circuit; the second reference voltage circuit comprises resistors R9 and R10; one end of the resistor R10 is connected with the positive voltage VCC, and the other end is connected with one end of the resistor R9 and obtains a second reference voltage Vref 2; the other end of the resistor R9 is grounded; the resistor R9 can adopt an adjustable potentiometer so as to obtain different comparison reference voltages, namely a second reference voltage Vref2, so that the circuit can be applied to circuit breaker products with different specifications;
the inverting input end of the operational amplifier U2B is connected with a second reference voltage Vref 2; the output end of the operational amplifier U2B is connected with the base electrode of a triode Q1 through a resistor R12, the emitting electrode of the triode Q1 is grounded, the collecting electrode of the triode Q1 is connected with one end of a relay K1 coil and the anode of a diode D4, and the other end of the relay K1 coil and the cathode of the diode D4 are connected with a positive voltage VDD;
normally open contact terminal bank J1 of relay K1;
the positive voltages VCC and VDD can be generated by a power supply circuit, which is a conventional circuit in the art and is omitted from description;
preferably, in this embodiment, a delay circuit is further added, the delay circuit includes a resistor R11 and a capacitor C3, one end of the resistor R11 is connected to the positive voltage VCC, and the other end is connected to one end of the capacitor C3 and the non-inverting input terminal of the operational amplifier U2B; the other end of the capacitor C3 is grounded.
In the embodiment, the control of the circuit breaker is realized by fixing the thermosensitive element RP1 on the heating element of the circuit breaker, and the resistance value of the thermosensitive element RP1 changes in real time along with the change of temperature; resistors R1 and R2 divide the positive voltage VCC, and the divided voltage is input to a voltage follower formed by an operational amplifier U1A; when the circuit breaker is not overloaded, the resistance value of the thermosensitive element RP1 is larger, the voltage on the thermosensitive element RP1 is larger, the operational amplifier U1B outputs low voltage, the operational amplifier U2A also outputs low voltage, the diode D3 is conducted, the voltage of the in-phase input end of the operational amplifier U2B is pulled low, the operational amplifier U2B also outputs low voltage, the triode Q1 cannot be conducted, and the relay K1 does not pull in; no alarm signal is output at terminal row J1;
when the breaker is heated due to overload, the resistance value of the thermosensitive element RP1 is reduced, the voltage on the thermosensitive element RP1 is reduced, when the temperature of the breaker is greater than a set reference, the operational amplifier U1B is inverted and outputs a high level, the operational amplifier U2A also outputs a high level, the diode D3 is cut off, the non-inverting input end of the operational amplifier U2B is at the high level and is greater than a second reference voltage Vref2, therefore, the U2B outputs the high level, the triode Q1 is conducted, the relay K1 is electrified and attracted, and an alarm signal is output at the terminal row J1;
in consideration of the problem of fluctuation interference of the error amplification voltage and the critical value of the comparison reference voltage, the delay circuit is added in the circuit, so that the problems are effectively avoided, and the delay time can be adjusted by changing the parameters of the device.
The circuit provided by the embodiment can be suitable for circuit breakers of various specifications, the rated currents of the circuit breakers are different, the temperatures of the circuit breakers in overload are slightly different, different comparative reference voltages can be obtained by adjusting the adjustable potentiometer R9, and the circuit can be applied to products of various specifications.
The circuit provided by the embodiment does not need to be provided with the diode D2 when being applied to single-path temperature acquisition and monitoring; the first reference voltage circuit can adopt a simple two-resistor voltage division circuit;
the circuit provided by the embodiment can also be applied to multi-path temperature acquisition and monitoring, and a diode D2 is required; then the circuit on the left side of the diode D2 in fig. 1 is simply repeated for multiple paths. Once the temperature of a certain circuit of the circuit breaker reaches the overload temperature, the product can send an overload alarm signal.
The mechanical structure of the circuit breaker is designed to be tripped in a short circuit, and not tripped in an overload state; the focus of the present application is on the description of the electrical circuit, and therefore, the description of the mechanical structure of the circuit breaker will be omitted.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (9)
1. The utility model provides a temperature control type moulded case circuit breaker overload alarm does not trip gear which characterized in that: the device comprises a current output terminal (1), a static iron core (2) and a thermal element (5) are installed on the current output terminal (1), a heat-conducting insulating part is installed on the thermal element (5), a thermistor (9) is installed in the heat-conducting insulating part, the thermistor (9) is connected with a signal wire (11), the signal wire (11) is connected with a controller (12), and the thermal element (5) is connected with a flexible connection (10).
2. The overload alarm non-tripping device of the temperature controlled molded case circuit breaker as claimed in claim 1, wherein: the controller (12) is mounted on the circuit breaker housing.
3. The overload alarm non-tripping device of the temperature controlled molded case circuit breaker as claimed in claim 1, wherein: the current output terminal (1) and the static iron core (2) are riveted and fixed through a first rivet (3).
4. The overload alarm non-tripping device of the temperature controlled molded case circuit breaker as claimed in claim 1, wherein: the current output terminal (1) and the thermal element (5) are riveted and fixed through a second rivet (4).
5. The overload alarm non-tripping device of the temperature controlled molded case circuit breaker as claimed in claim 1, wherein: the thermal element (5) and the flexible connection (10) are connected by welding.
6. The overload alarm non-tripping device of the temperature controlled molded case circuit breaker as claimed in claim 1, wherein: the flexible connection (10) is made of copper.
7. The overload alarm non-tripping device of the temperature controlled molded case circuit breaker as claimed in claim 1, wherein: the heat conduction insulating part is a ceramic part.
8. The overload alarm non-tripping device of the temperature controlled molded case circuit breaker as claimed in claim 1, wherein: the heat conduction insulating part is a heat conduction silica gel part.
9. The overload alarm non-tripping device of the temperature controlled molded case circuit breaker according to claim 7, wherein: the ceramic part includes first potsherd (7) and second potsherd (8), first potsherd (7) and second potsherd (8) are half chamber structure, heating element (5) with first potsherd (7) with second potsherd (8) are connected by screw (6), first potsherd (7) with second potsherd (8) intracavity is equipped with thermistor (9), first potsherd (7) with second potsherd (8) side is opened there is the export, signal line (11) one end is connected thermistor (9), and the other end passes exit linkage controller (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022351360.XU CN213071042U (en) | 2020-10-20 | 2020-10-20 | Overload alarm non-tripping device for temperature control type molded case circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022351360.XU CN213071042U (en) | 2020-10-20 | 2020-10-20 | Overload alarm non-tripping device for temperature control type molded case circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213071042U true CN213071042U (en) | 2021-04-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022351360.XU Active CN213071042U (en) | 2020-10-20 | 2020-10-20 | Overload alarm non-tripping device for temperature control type molded case circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213071042U (en) |
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2020
- 2020-10-20 CN CN202022351360.XU patent/CN213071042U/en active Active
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