CN216530533U - Open-phase display protection device for three-phase heating furnace - Google Patents
Open-phase display protection device for three-phase heating furnace Download PDFInfo
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- CN216530533U CN216530533U CN202122671947.3U CN202122671947U CN216530533U CN 216530533 U CN216530533 U CN 216530533U CN 202122671947 U CN202122671947 U CN 202122671947U CN 216530533 U CN216530533 U CN 216530533U
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Abstract
The utility model provides a three-phase heating furnace open-phase display protection device, comprising: first fuse, second fuse, third fuse and ac contactor, the one end of first fuse, second fuse and third fuse is concatenated with three-phase alternating current power supply respectively, and the other end of first fuse, second fuse and third fuse concatenates with the one end of ac contactor's three main contact respectively, the other end of ac contactor's three main contact concatenates with the one end of the heating wire of heating furnace, and the one end of the heating wire of heating furnace inserts the zero line and forms three-phase main loop, still includes: the device comprises a default phase display module and a default phase protection module; the open-phase display protection device for the three-phase heating furnace can realize open-phase display and power-off protection through simple electrical element connection, and can protect the condition that a fuse is fused due to abnormity such as overlarge current and the like in time, so that the heating wire of the three-phase heating furnace is protected.
Description
Technical Field
The utility model belongs to the technical field of open-phase protection, and particularly relates to a three-phase heating furnace open-phase display protection device.
Background
Three-phase heating furnace size is huge, and the time of heating is long usually, if in the heating process, because some looks lack the looks broken string, other two-phase continue to heat, and temperature in the furnace at this moment can not reach the temperature requirement of original institute, and the work piece that so processing was come out is just unqualified, still can cause the damage of heating wire, but the problem of broken phase is difficult to perceive, still needs to handle in time after the broken phase.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a phase-failure display protection device for a three-phase heating furnace, and aims to solve the problem of display and protection after phase failure of the three-phase heating furnace in working.
In order to achieve the technical purpose and achieve the technical effect, the utility model is realized by the following technical scheme:
the utility model provides a phase-failure display protection device for a three-phase heating furnace, which comprises: first fuse, second fuse, third fuse and ac contactor, the one end of first fuse, second fuse and third fuse is concatenated with three-phase alternating current power supply respectively, and the other end of first fuse, second fuse and third fuse concatenates with the one end of ac contactor's three main contact respectively, the other end of ac contactor's three main contact concatenates with the one end of the three heating wire of three-phase heating furnace, and the other end of the three heating wire of three-phase heating furnace inserts the zero line and forms three-phase main loop, still includes:
the phase-lack display module comprises a circuit breaker and three indicating lamps, wherein one ends of three groups of contacts of the circuit breaker are connected with a three-phase alternating-current power supply, the other ends of the three groups of contacts of the circuit breaker are respectively connected with one ends of the three indicating lamps in series, and the other ends of the three indicating lamps are connected with a zero line;
the phase-loss protection module comprises a fourth fuse, a fifth fuse, a start button, a stop button, a coil of the alternating current contactor and an auxiliary contact of the alternating current contactor; one end of the fourth fuse is connected to one phase power supply in the three-phase alternating current power supply, and the other end of the fourth fuse is connected with one end of the starting button in series; the other end of the starting button is connected with one end of a stopping button in series, the other end of the stopping button is connected with one end of a coil of the alternating current contactor in series, the other end of the coil of the alternating current contactor is connected with one end of a fifth fuse in series, and the other end of the fifth fuse is connected with any one phase power supply in the rest two phases of the three-phase alternating current power supply; and two ends of an auxiliary contact of the alternating current contactor are connected with two ends of the starting button in parallel.
As a further improvement of the present invention, the open-phase protection module further includes:
a coil of the first relay is connected with two ends of the first fuse in parallel; a coil of the second relay is connected with two ends of the second fuse in parallel; a coil of the third relay is connected with two ends of a third fuse in parallel; and the normally closed contact of the first relay, the normally closed contact of the second relay and the normally closed contact of the third relay are sequentially connected between the fifth fuse and a coil of the alternating current contactor in series.
The utility model has the advantages that:
1. the open-phase display protection device for the three-phase heating furnace can realize open-phase display and power-off protection through simple connection of electrical elements.
2. The phase-failure display protection device for the three-phase heating furnace can protect the situation that the fuse is fused due to the abnormality of overlarge current and the like in time, so that the heating wires of the three-phase heating furnace are protected.
Drawings
Fig. 1 is an electrical schematic diagram of a phase-loss display protection device of a three-phase heating furnace according to embodiment 1;
fig. 2 is an electrical schematic diagram of a phase-loss display protection device of a three-phase heating furnace according to embodiment 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Example 1
The embodiment of the utility model provides a phase-lack display protection device for a three-phase heating furnace, as shown in fig. 1, comprising: the three-phase alternating current heating furnace comprises a first fuse FU1, a second fuse FU2, a third fuse FU3 and an alternating current contactor, wherein one end of the first fuse FU1, one end of the second fuse FU2 and one end of the third fuse FU3 are respectively connected with a first-phase power supply L1, a second-phase power supply L2 and a third-phase power supply L3 in a three-phase alternating current power supply in series, the other ends of the first fuse FU1, the second fuse FU2 and the third fuse FU3 are respectively connected with one ends of three main contacts KM1 of the alternating current contactor in series, the other ends of the three main contacts KM1 of the alternating current contactor are connected with one ends of three heating wires RS of the three-phase heating furnace in series, and the other ends of the three heating wires RS of the three-phase heating furnace are connected with a zero line N to form a three-phase main loop;
in order to perform default phase display, a default phase display module is further arranged, the default phase display module comprises a breaker QF, a first indicator light W1, a second indicator light W2 and a third indicator light W3, one ends of three groups of contacts of the breaker QF are respectively connected to a first phase power supply L1, a second phase power supply L2 and a third phase power supply L3 in a three-phase alternating current power supply, the other ends of the three groups of contacts of the breaker QF are respectively connected in series with one ends of the first indicator light W1, the second indicator light W2 and the third indicator light W3, and the other ends of the first indicator light W1, the second indicator light W2 and the third indicator light W3 are connected to a zero line; after the main loop starts to work, the breaker QF is closed, and the first indicator light W1, the second indicator light W2 and the third indicator light W3 are normally on; when any one phase of a first-phase power supply L1, a second-phase power supply L2 and a third-phase power supply L3 of the three-phase alternating-current power supply is in phase failure, the loop sampled by the circuit breaker QF is opened, and the corresponding indicator lamp is turned off, for example, if the second-phase power supply L2 is in phase failure, the loop sampled by the circuit breaker QF and connected in series with the second indicator lamp W2 is opened, and the second indicator lamp W2 is turned off, so that the second-phase power supply L2 is in phase failure;
in order to carry out open-phase protection, the system is also provided with an open-phase protection module, wherein the open-phase protection module comprises a fourth fuse FU4, a fifth fuse FU5, a starting button SB1, a stopping button SB2, a coil KM-1 of an alternating current contactor and an auxiliary contact KM1-1 of the alternating current contactor; one end of the fourth fuse FU4 is connected to any one-phase power supply of the three-phase alternating current power supply, such as a third-phase power supply L3, and the other end of the fourth fuse FU4 is connected in series with one end of a start button SB 1; the other end of the starting button SB1 is connected in series with one end of the stopping button SB2, the other end of the stopping button SB2 is connected in series with one end of a coil KM-1 of the alternating current contactor, the other end of the coil KM-1 of the alternating current contactor is connected in series with one end of a fifth fuse FU5, and the other end of the fifth fuse FU5 is connected to any one phase power supply of the rest two phases of the three-phase alternating current power supply, such as a second phase power supply L2; two ends of an auxiliary contact KM1-1 of the alternating current contactor are connected with two ends of a starting button SB1 in parallel to realize self-locking after the alternating current contactor is started; when the starting device is started, after a starting button SB1 is pressed, a coil KM-1 of the alternating current contactor is connected into a loop and conducted, so that three main contacts KM1 of the alternating current contactor are closed, a three-phase main loop operates, and meanwhile, an auxiliary contact KM1-1 of the alternating current contactor is closed to realize self-locking after the alternating current contactor is started; illustratively, when a phase failure occurs in any one of the third phase power supply L3 connected to the fourth fuse FU4 or the second phase power supply L2 connected to the fifth fuse FU5, the circuit is opened, and the coil KM-1 of the ac contactor is powered off, so that the three main contacts KM1 of the ac contactor are disconnected, thereby opening the three-phase main circuit and protecting the three heating wires RS of the three-phase heating furnace.
Example 2
As shown in fig. 2, the electrical structure is the same as that of embodiment 1, except that: in order to further enhance the open-phase protection effect, the adopted open-phase protection module further comprises: the coil KA1 of the first relay is connected with two ends of the first fuse FU1 in parallel, when the first fuse FU1 works normally, the coil KA1 of the first relay is short-circuited and does not work, and when the first fuse FU1 is fused, the two ends of the coil KA1 of the first relay generate voltage difference to be conducted; the coil KA2 of the second relay is connected with two ends of the second fuse FU2 in parallel, when the second fuse FU2 works normally, the coil KA2 of the second relay is short-circuited and does not work, and when the second fuse FU2 is fused, the two ends of the coil KA2 of the second relay generate voltage difference to be conducted; a coil KA3 of the third relay is connected with two ends of a third fuse FU3 in parallel, when the third fuse FU3 works normally, a coil KA3 of the third relay is short-circuited and does not work, and when the third fuse FU3 is fused, two ends of a coil KA3 of the third relay generate voltage difference to be conducted; the normally closed contact KA-1 of the first relay, the normally closed contact KA-2 of the second relay and the normally closed contact KA-3 of the third relay are sequentially connected in series between the fifth fuse FU5 and the coil KM-1 of the alternating current contactor, in a normal working state, the normally closed contact KA-1 of the first relay, the normally closed contact KA-2 of the second relay and the normally closed contact KA-3 of the third relay are in a closed state, and after the starting button SB1 is pressed, the coil KM-1 of the alternating current contactor is connected into a loop to be conducted;
when any one of the first fuse FU1, the second fuse FU2 and the third fuse FU3 is fused to cause phase loss, the coil of the corresponding relay is conducted, so that the normally closed contact of the relay is opened to cause the open circuit of the loop, the coil KM-1 of the alternating current contactor is powered off, and the main loop is turned off; illustratively, if the first fuse FU1 blows, a voltage difference is generated between two ends of the coil KA1 of the first relay, so that the two ends are conducted, the normally closed contact KA-1 of the first relay is opened, the loop is opened, the coil KM-1 of the alternating current contactor is powered off, and the main loop is turned off.
Reference in the specification to "some embodiments," "one embodiment," or "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in some embodiments," "in one embodiment," or "in an embodiment," or the like, in various places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Additionally, the various elements of the drawings of the present application are merely schematic illustrations and are not drawn to scale.
Having thus described several aspects of at least one embodiment of this invention, it is to be appreciated various alterations, modifications, and improvements will readily occur to those skilled in the art. Such alterations, modifications, and improvements are intended to be within the spirit and scope of the utility model.
Claims (2)
1. A three-phase heating furnace open-phase display protection device comprises: first fuse, second fuse, third fuse and ac contactor, the one end of first fuse, second fuse and third fuse is concatenated with three-phase alternating current power supply respectively, and the other end of first fuse, second fuse and third fuse concatenates with the one end of ac contactor's three main contact respectively, the other end of ac contactor's three main contact concatenates with the one end of the three heating wire of three-phase heating furnace, and the other end of the three heating wire of three-phase heating furnace inserts the zero line and forms three-phase main loop, its characterized in that still includes:
the phase-lack display module comprises a circuit breaker and three indicating lamps, wherein one ends of three groups of contacts of the circuit breaker are connected with a three-phase alternating-current power supply, the other ends of the three groups of contacts of the circuit breaker are respectively connected with one ends of the three indicating lamps in series, and the other ends of the three indicating lamps are connected with a zero line;
the phase-loss protection module comprises a fourth fuse, a fifth fuse, a start button, a stop button, a coil of the alternating current contactor and an auxiliary contact of the alternating current contactor; one end of the fourth fuse is connected to one phase power supply in the three-phase alternating current power supply, and the other end of the fourth fuse is connected with one end of the starting button in series; the other end of the starting button is connected with one end of a stopping button in series, the other end of the stopping button is connected with one end of a coil of the alternating current contactor in series, the other end of the coil of the alternating current contactor is connected with one end of a fifth fuse in series, and the other end of the fifth fuse is connected with any one phase power supply in the rest two phases of the three-phase alternating current power supply; and two ends of an auxiliary contact of the alternating current contactor are connected with two ends of the starting button in parallel.
2. The phase-lack display protection device of a three-phase heating furnace according to claim 1, characterized in that: the open-phase protection module further comprises:
a coil of the first relay is connected with two ends of the first fuse in parallel; a coil of the second relay is connected with two ends of the second fuse in parallel; a coil of the third relay is connected with two ends of a third fuse in parallel; and the normally closed contact of the first relay, the normally closed contact of the second relay and the normally closed contact of the third relay are sequentially connected in series between the fifth fuse and a coil of the alternating current contactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122671947.3U CN216530533U (en) | 2021-11-03 | 2021-11-03 | Open-phase display protection device for three-phase heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122671947.3U CN216530533U (en) | 2021-11-03 | 2021-11-03 | Open-phase display protection device for three-phase heating furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216530533U true CN216530533U (en) | 2022-05-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122671947.3U Expired - Fee Related CN216530533U (en) | 2021-11-03 | 2021-11-03 | Open-phase display protection device for three-phase heating furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216530533U (en) |
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2021
- 2021-11-03 CN CN202122671947.3U patent/CN216530533U/en not_active Expired - Fee Related
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Granted publication date: 20220513 |