Circuit protection device
By designing circuit protection devices of power input modules, control modules, thermal overload protection modules and motor integrated protectors in the steel strip hot rolling circuit, the tripping and circuit phase loss caused by excessive current during the steel strip hot rolling process are solved, and effective protection of the subsequent load and stable operation of the production line are achieved.
Patent Information
- Application Number
- CN202421342473.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-12
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-06-12
AI Technical Summary
During the hot rolling process of steel strips, the high-power cooling fan has too much current when starting, which can easily lead to tripping and circuit phase loss, causing the steel strip rolling production line to shut down.
Design a circuit protection device, including a power input module, a control module, a thermal overload protection module and a motor integrated protector. The thermal overload protection module closes the short circuit when the circuit is overheated and stops power supply; the motor comprehensive protector protects the circuit in the phase-deficient state of the circuit.
By setting up a thermal overload protection module and a motor integrated protector, the rear-stage load can be effectively protected, avoid tripping and circuit phase loss caused by excessive current, and ensure the stable operation of the steel strip rolling production line.
Smart Images
Figure CN222940538U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of circuit protection, and particularly relates to a circuit protection device. Background Art
[0002] During the hot rolling process of steel strips, the steel strips need to be cooled by a heat dissipation device. Currently, generally, a high-power cooling fan is used for heat dissipation. However, when the high-power cooling fan starts, there is a phenomenon of excessive current, which easily causes a trip and leads to a full-line shutdown of the steel strip rolling production line. Therefore, the existing solution is to set a thermal overload protector for circuit protection. However, using only the thermal overload protector still has the phenomenon of excessive instantaneous current causing a trip, that is, resulting in a single-phase loss in the circuit. Content of the Utility Model
[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a circuit protection device, which can effectively protect the subsequent load.
[0004] The circuit protection device according to the first aspect embodiment of the utility model includes:
[0005] A power input module for connecting to a three-phase AC power supply;
[0006] A control module, the control module is connected to the power output module;
[0007] A thermal overload protection module, one end of the thermal overload protection module is connected to the control module, and the other end of the thermal overload module is connected to the subsequent load;
[0008] A motor comprehensive protector, the motor comprehensive protector is connected between the control module and the thermal overload protection module, wherein the motor comprehensive protector is used to protect the circuit in the state of single-phase loss in the circuit.
[0009] The circuit protection device according to the embodiment of the utility model has at least the following beneficial effects: By setting the thermal overload protection module, when the circuit is overheated, the short circuit can be closed and the power supply to the subsequent load can be stopped, avoiding damage to the subsequent load. The motor comprehensive protector can protect the circuit in the case of single-phase loss in the circuit. By setting the thermal overload protection module and the motor comprehensive protector, the subsequent load can be effectively protected.
[0010] According to some embodiments of the present utility model, the power input module includes a first input terminal, a second input terminal, a third input terminal, and a neutral line terminal. The motor comprehensive protector includes a first relay, a second relay, and a third relay. One end of the first relay is connected to the first input terminal, one end of the second relay is connected to the second input terminal, one end of the third relay is connected to the third input terminal, and the neutral line terminal is respectively connected to the other ends of the first relay, the second relay, and the third relay. The normally open contacts of the first relay, the normally open contacts of the second relay, and the normally open contacts of the third relay are connected in series.
[0011] According to some embodiments of the present utility model, the motor comprehensive protector further includes a stop switch and a start switch. The stop switch, the start switch, the normally open contacts of the first relay, the normally open contacts of the second relay, and the normally open contacts of the third relay are connected in series.
[0012] According to some embodiments of the present utility model, the circuit protection device further includes a contactor. The main contacts of the contactor are connected between the control module and the thermal overload protection module. The coil of the contactor, the stop switch, the start switch, the normally open contacts of the first relay, the normally open contacts of the second relay, and the normally open contacts of the third relay are connected in series, and the normally open contact of the contactor is connected in parallel with the start switch.
[0013] According to some embodiments of the present utility model, the circuit protection device further includes a remote control switch. The coil of the contactor, the stop switch, the start switch, the normally open contacts of the first relay, the normally open contacts of the second relay, the normally open contacts of the third relay, and the remote control switch are connected in series.
[0014] According to some embodiments of the present utility model, the circuit protection device further includes a first indicator light, a second indicator light, and a third indicator light. The normally closed contact of the first relay is connected in series with the first indicator light, the normally closed contact of the first relay is connected in series with the first indicator light, and the normally closed contact of the first relay is connected in series with the first indicator light.
[0015] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The following further describes the present utility model in conjunction with the drawings and embodiments, where:
[0017] Figure 1 is a schematic diagram of the circuit protection device according to the embodiment of the present utility model. Detailed Implementation Modes
[0018] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.
[0019] In the description of the present utility model, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.
[0020] In the description of the present utility model, the meaning of "several" is one or more, the meaning of "multiple" is two or more. Understanding "greater than", "less than", "exceeding", etc. as not including the number itself, and understanding "above", "below", "within", etc. as including the number itself. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.
[0021] In the description of the present utility model, unless otherwise clearly defined, words such as "set", "installed", "connected", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.
[0022] Refer to Figure 1, in the embodiments of the present application, the circuit protection device includes a motor comprehensive protector and a power input module, a control module QF1, and a thermal overload protection module connected in sequence. Among them, the motor comprehensive protector is used to protect the circuit in the case of a phase loss state of the circuit. One end of the thermal overload protection module is connected to the control module QF1, and the other end of the thermal overload module is connected to the subsequent load. The motor comprehensive protector is connected between the control module QF1 and the thermal overload protection module. The power input module includes a first input terminal, a second input terminal, a third input terminal, and a neutral line terminal. The first input terminal is used to connect to the A phase of the three-phase AC power supply, the second input terminal is used to connect to the B phase of the three-phase AC power supply, and the third input terminal is used to connect to the C phase of the three-phase AC power supply. The motor comprehensive protector includes a control switch QF2, a first relay KA1, a second relay KA2, a third relay KA3, a stop switch SB1, a start switch SB2, and a contactor KM. One end of the first relay KA1 is connected to the first input terminal, one end of the second relay KA2 is connected to the second input terminal, and one end of the third relay KA3 is connected to the third input terminal. The neutral line terminal is respectively connected to the other ends of the first relay KA1, the second relay KA2, and the third relay KA3. The main contacts of the contactor KM are connected between the control module QF1 and the thermal overload protection module. The coil of the contactor KM, the stop switch SB1, the start switch SB2, the normally open contact of the first relay KA1, the normally open contact of the second relay KA2, and the normally open contact of the third relay KA3 are connected in series. The normally open contact of the contactor KM is connected in parallel with the start switch SB2.
[0023] It should be noted that when the control module QF1 and the control switch QF2 are closed, the first relay KA1, the second relay KA2, and the third relay KA3 are turned on, and the normally open contacts of the first relay KA1, the second relay KA2, and the third relay KA3 are closed. When the start switch SB2 is closed, the coil of the contactor KM is turned on to form a loop, and the subsequent load starts to work. The normally open contact of the contactor KM is closed to form self-locking. When any one phase is disconnected, the coil of the corresponding relay loses power, the normally open contact of the corresponding relay is disconnected, and the normally closed contact is closed, and the control loop is disconnected, and the subsequent load stops running to protect the subsequent load.
[0024] It should be noted that the thermal overload protection module includes a thermal overload protection relay FR. The normally open contact of the thermal overload protection relay FR, the coil of the contactor KM, the stop switch SB1, the start switch SB2, the normally open contact of the first relay KA1, the normally open contact of the second relay KA2, and the normally open contact of the third relay KA3 are connected in series. When the temperature of the circuit is greater than the preset temperature, the normally open contact of the thermal overload protection relay FR is disconnected, and the control loop is disconnected, and the subsequent load stops running.
[0025] It can be understood that the circuit protection device further includes a first indicator light HL1, a second indicator light HL2, and a third indicator light HL3. The normally closed end of the first relay KA1 is connected in series with the first indicator light HL1. The normally closed end of the first relay KA1 is connected in series with the first indicator light HL1. The normally closed end of the first relay KA1 is connected in series with the first indicator light HL1. When the circuit is in normal operation, the normally closed ends of the first relay KA1, the second relay KA2, and the third relay KA3 are disconnected, and the first indicator light HL1, the second indicator light HL2, and the third indicator light HL3 are all extinguished. When any phase is missing, that is, the circuit is in a phase-loss state, the corresponding relay closes, and the indicator light connected in series with the relay lights up, reminding the user which phase is missing and promptly handling the fault.
[0026] It can be understood that the circuit protection device further includes a remote control switch KA4. The coil of the contactor KM, the stop switch SB1, the start switch SB2, the normally open end of the first relay KA1, the normally open end of the second relay KA2, the normally open end of the third relay KA3, and the remote control switch KA4 are connected in series. When the user needs to maintain the subsequent load, the circuit can be remotely controlled to cut off the power through the remote control switch KA4 to protect the user.
[0027] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of the present invention.
Claims
1. A circuit protection device, characterized in that: include: A power input module, used to connect a three-phase AC power supply; A control module, wherein the control module is connected to the power input module; A thermal overload protection module, one end of which is connected to the control module, and the other end of which is connected to a subsequent load; The motor integrated protector is connected between the control module and the power input module, wherein the motor integrated protector is used to protect the circuit in the circuit phase loss state.
2. The circuit protection device according to claim 1, characterized in that: The power input module includes a first input terminal, a second input terminal, a third input terminal and a neutral terminal, and the motor integrated protector includes a first relay, a second relay and a third relay, one end of the first relay is connected to the first input terminal, one end of the second relay is connected to the second input terminal, one end of the third relay is connected to the third input terminal, the neutral terminal is respectively connected to the other end of the first relay, the other end of the second relay and the other end of the third relay, and the normally open end of the first relay, the normally open end of the second relay and the normally open end of the third relay are connected in series.
3. The circuit protection device according to claim 2, characterized in that: The motor integrated protector also includes a stop switch and a start switch, wherein the stop switch, the start switch, the normally open end of the first relay, the normally open end of the second relay, and the normally open end of the third relay are connected in series.
4. The circuit protection device according to claim 3, characterized in that: The circuit protection device also includes a contactor, whose main contacts are connected between the control module and the thermal overload protection module, the coil of the contactor, the stop switch, the start switch, the normally open end of the first relay, the normally open end of the second relay and the normally open end of the third relay are connected in series, and the normally open end of the contactor is connected in parallel with the start switch.
5. The circuit protection device according to claim 4, characterized in that: The circuit protection device also includes a remote control switch, and the coil of the contactor, the stop switch, the start switch, the normally open end of the first relay, the normally open end of the second relay, the normally open end of the third relay, and the remote control switch are connected in series.
6. The circuit protection device according to claim 2, characterized in that: The circuit protection device also includes a first indicator light, a second indicator light and a third indicator light. The normally closed end of the first relay is connected in series with the first indicator light, the normally closed end of the first relay is connected in series with the first indicator light, and the normally closed end of the first relay is connected in series with the first indicator light.