Heater control circuit

Abstract

The utility model relates to a heater control circuit. A contactor is arranged on a main circuit; the wire outlet end of the contactor is connected with a heater; a near-end control circuit is arranged on the contactor; the near-end control circuit is connected in parallel with the far-end control circuit to control the on-off of the contactor; therefore, on-off of the heater is controlled. According to the heater control circuit, on-off and on-off of the heater can be controlled at the near end and the far end, and the technical problems that in an existing heater control circuit, on-off of the heater and on-off of the heater cannot be controlled remotely, and due to the fact that the power of the heater is large, on-off and on-off of the heater need to be controlled at the near end and the far end are solved.

Description

Technical Field

[0001] The embodiments of the present utility model relate to a control circuit, and in particular to a heater control circuit. Background Art

[0002] In the existing heater control circuit, the switch and the on / off of the heater cannot be controlled remotely. Since the power of the heater is large, the on / off control of the heater needs to be realized at both the near end and the far end. Utility Model Content

[0003] The embodiment of the present utility model aims to provide a heater control circuit capable of controlling the switching and on / off of a heater at both the proximal end and the distal end.

[0004] In order to achieve the above objectives, the embodiment of the present invention designs a heater control circuit, including:

[0005] Main circuit;

[0006] A contactor is provided on the main circuit;

[0007] a heater connected to the outlet terminal of the contactor;

[0008] A proximal control circuit is provided on the contactor;

[0009] The remote control circuit, wherein the near-end control circuit is connected in parallel with the remote control circuit, controls the on-off of the contactor; thereby controlling the on-off of the heater.

[0010] Furthermore, in the heater control circuit of the present invention, the main circuit further includes:

[0011] Incoming power supply;

[0012] A circuit breaker, wherein the incoming power supply is connected to the incoming terminal of the circuit breaker; and the outgoing terminal of the circuit breaker is connected to the incoming terminal of the contactor;

[0013] The outlet terminal of the contactor is connected to the heater;

[0014] A leakage mutual inductor is provided on the line from the output terminal of the contactor to the heater.

[0015] Furthermore, in the heater control circuit of the present invention, the leakage mutual inductor is connected to the leakage relay; and the control point of the leakage relay is connected in series to the contact of the contactor.

[0016] Furthermore, in the heater control circuit of the present invention, the proximal control circuit further includes:

[0017] A control power supply connected to the line inlet terminal of the circuit breaker of the main circuit;

[0018] A fuse, wherein the control power supply is connected to the inlet end of the fuse; the outlet end of the fuse is respectively connected to the inlet end of the proximal stop button, the inlet end of the first normally open contact of the contactor, the inlet end of the first normally closed contact of the contactor, the inlet end of the first auxiliary contact of the circuit breaker, the inlet end of the first auxiliary contact of the leakage relay, and the inlet end of the power supply of the leakage relay;

[0019] The outgoing line of the proximal stop button is connected to the incoming line of the proximal start button, and the outgoing line of the proximal start button is connected to the remote control circuit; and then connected to the incoming line of the contactor coil and the incoming line of the first intermediate relay coil; the outgoing line of the contactor coil and the outgoing line of the first intermediate relay coil are respectively connected to the neutral line;

[0020] The input and output terminals of the start button are connected in parallel to the input and output terminals of the second normally open contact of the contactor;

[0021] The outgoing wire ends of the first normally open contact of the contactor are respectively connected to the incoming wire ends of the proximal red light indicator and the distal red light indicator; the outgoing wire ends of the proximal red light indicator and the distal red light indicator are connected to the neutral line;

[0022] The outgoing wire ends of the incoming wire end of the first normally closed contact of the contactor are respectively connected to the incoming wire ends of the proximal green light indicator and the distal green light indicator; the outgoing wire ends of the proximal green light indicator and the distal green light indicator are connected to the neutral wire;

[0023] The outgoing line end of the first auxiliary contact of the circuit breaker is connected to the incoming line end of the proximal yellow light indicator; the outgoing line end of the proximal yellow light indicator is connected to the neutral line;

[0024] The incoming terminal of the first auxiliary contact of the leakage relay is connected to the incoming terminal of the circuit breaker coil; the outgoing terminal of the circuit breaker coil is connected to the neutral line;

[0025] The outgoing terminal of the leakage relay power supply is connected to the neutral line.

[0026] Furthermore, in the heater control circuit of the present invention, the remote control circuit is a DCS output point that allows starting or stopping.

[0027] Furthermore, in the heater control circuit of the present invention, the 1S1 output terminal and the 1S2 output terminal of the leakage transformer are respectively connected to the seventh terminal and the eighth terminal of the leakage relay.

[0028] Furthermore, in the heater control circuit of the present invention, the two normally open contacts of the first intermediate relay coil serve as alarm outputs respectively:.

[0029] Furthermore, in the heater control circuit of the present invention, the leakage relay of the heater control circuit is a 5SV80006KK type leakage relay.

[0030] Compared with the prior art, the utility model adopts the method of arranging a contactor on the main circuit; connecting a heater to the output end of the contactor; arranging a proximal control circuit on the contactor; connecting the proximal control circuit and the remote control circuit in parallel to control the on and off of the contactor; thereby controlling the on and off of the heater; achieving the goal of being able to control the switching and on and off of the heater at both the proximal and remote ends, solving the technical problem in the existing heater control circuit that the switching and on and off of the heater cannot be remotely controlled and that the switching and on and off of the heater need to be controlled at both the proximal and remote ends due to the high power of the heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the main circuit of the utility model;

[0032] Figure 2 This is a schematic diagram of the control circuit of the utility model;

[0033] Figure 3 This is a schematic diagram of the leakage transformer of the present invention connected to the leakage relay;

[0034] Figure 4 This is a schematic diagram of the two normally open contact outputs of the first intermediate relay coil. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will appreciate that many technical details are provided in various embodiments of the present invention to facilitate a better understanding of the present application. However, even without these technical details and the various variations and modifications based on the following embodiments, the technical solutions claimed in the claims of this application can be achieved.

[0036] The embodiment of the present utility model relates to a heater control circuit, such as Figure 1 、 Figure 2 、 Figure 3 Shown, including:

[0037] In the main circuit of the present utility model, it is used to connect the heater and provide power to the heater HT;

[0038] A contactor KM is provided on the main circuit; the contactor KM is used to switch the heater HT on and off;

[0039] Connect the heater HT to the outlet terminal of the contactor KM; the heater HT is mainly used for heating;

[0040] A proximal control circuit is provided on the contactor KM; the proximal control circuit is used to manually control the heating of the heater HT;

[0041] The local control circuit is connected in parallel with the remote control circuit to control the on / off switching of the contactor KM, thereby controlling the on / off switching of the heater HT. The remote control circuit is used to automatically control the heater HT. This enables both local and remote control of the heater HT, resolving the technical problem of existing heater control circuits that cannot remotely control the on / off switching of the heater HT. Due to the high power of the heater HT, both local and remote control of the heater HT is required.

[0042] In order to achieve the above technical effects, the heater control circuit in this embodiment is as follows: Figure 1 、 Figure 2 、 Figure 3 As shown, the main circuit also includes:

[0043] Incoming power supply L1 is used to provide power;

[0044] The incoming power supply L1 is connected to the incoming terminal of the circuit breaker QF; the outgoing terminal of the circuit breaker QF is connected to the incoming terminal of the contactor KM; the circuit breaker QF is used to switch the incoming power supply L1;

[0045] The outgoing terminal of the contactor KM is connected to the heater HT;

[0046] A leakage current transformer TA0 is provided on the line from the output terminal of the contactor KM to the heater HT. The leakage current transformer TA0 is used to detect leakage current in the line of the heater HT.

[0047] In order to achieve the above technical effects, the heater control circuit in this embodiment is as follows: Figure 1 、 Figure 2 、 Figure 3 As shown, the leakage transformer TA0 is connected to the leakage relay RCD; the control point of the leakage relay RCD is connected in series to the contact of the contactor KM, thereby realizing leakage protection of the heater control circuit in this embodiment.

[0048] In order to achieve the above technical effects, the heater control circuit in this embodiment is as follows: Figure 1 、 Figure 2 、 Figure 3 As shown, the proximal control circuit further includes:

[0049] Connect the control power supply to the incoming line terminal of the circuit breaker QF of the main circuit; the control power supply L2 is used to manually control the main circuit;

[0050] Connect the control power supply L2 to the incoming line of fuse FU1; connect the outgoing line of fuse FU1 to the incoming line of the proximal stop button S2, the incoming line of the first normally open contact KM-1 of the contactor, the incoming line of the first normally closed contact KM-2 of the contactor, the incoming line of the first auxiliary contact QF-1 of the circuit breaker, the incoming line of the first auxiliary contact RCD of the leakage relay, and the incoming line of the power supply of the leakage relay RCD; fuse FU1 is used to protect the proximal control circuit;

[0051] The outgoing line of the proximal stop button S2 is connected to the incoming line of the proximal start button S1, which is then connected to the remote control circuit; the outgoing line is then connected to the incoming line of the contactor coil KM0 and the incoming line of the first intermediate relay coil KA; the outgoing line of the contactor coil KM0 and the outgoing line of the first intermediate relay coil KA are respectively connected to the neutral line N;

[0052] Connect the input and output terminals of the start button S1 in parallel with the input and output terminals of the second normally open contact KM-3 of the contactor;

[0053] The outgoing wire ends of the first normally open contact KM-1 of the contactor are respectively connected to the incoming wire ends of the near-end red light indicator 1HR and the far-end red light indicator HR; the outgoing wire ends of the near-end red light indicator 1HR and the far-end red light indicator HR are connected to the neutral line N;

[0054] The inlet and outlet terminals of the first normally closed contact KM-2 of the contactor are respectively connected to the inlet terminals of the near-end green light indicator 1HG and the far-end green light indicator HG; the outlet terminals of the near-end green light indicator 1HG and the far-end green light indicator HG are connected to the neutral line N;

[0055] The outgoing line of the first auxiliary contact QF-1 of the circuit breaker is connected to the incoming line of the near-end yellow light indicator HY; the outgoing line of the near-end yellow light indicator HY is connected to the neutral line N;

[0056] The incoming terminal of the first auxiliary contact RCD of the leakage relay is connected to the incoming terminal of the circuit breaker coil QF0; the outgoing terminal of the circuit breaker coil QF0 is connected to the neutral line N;

[0057] The outgoing terminal of the leakage relay RCD power supply is connected to the neutral line N.

[0058] In the above circuit, the start button S1 is used to start the circuit, the contactor KM is actuated, the heater HT is turned on for heating, and the near-end red indicator light 1HR and the far-end red indicator light HR are turned on for indication.

[0059] In order to achieve the above technical effects, the heater control circuit in this embodiment is as follows: Figure 1 、 Figure 2 、 Figure 3 As shown in the figure, the remote control circuit is the DCS's start or stop output point. The DCS's start or stop output point is used for remote control.

[0060] In order to achieve the above technical effects, the heater control circuit in this embodiment is as follows: Figure 1 、 Figure 2 、 Figure 3 As shown, the 1S1 output terminal and the 1S2 output terminal of the leakage transformer TA0 are connected to the seventh terminal and the eighth terminal of the leakage relay RCD respectively. The leakage transformer TA0 performs leakage current detection, and the leakage relay RCD controls the on and off of the contactor KM.

[0061] In order to achieve the above technical effects, the heater control circuit in this embodiment is as follows: Figure 4 As shown, the two normally open contacts KA1 of the first intermediate relay coil are used as alarm outputs and remote output control contacts.

[0062] In order to achieve the above technical effects, the heater control circuit in this embodiment is as follows: Figure 1 、 Figure 2 、 Figure 3 As shown, the leakage relay RCD of the heater control circuit is a 5SV80006KK leakage relay.

[0063] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A heater control circuit, characterized in that: include: Main circuit; A contactor is provided on the main circuit; a heater connected to the outlet terminal of the contactor; A proximal control circuit is provided on the contactor; The remote control circuit, wherein the near-end control circuit is connected in parallel with the remote control circuit, controls the on-off of the contactor; thereby controlling the on-off of the heater.

2. The heater control circuit according to claim 1, wherein: The main circuit further includes: Incoming power supply; A circuit breaker, wherein the incoming power supply is connected to the incoming terminal of the circuit breaker; and the outgoing terminal of the circuit breaker is connected to the incoming terminal of the contactor; The outlet terminal of the contactor is connected to the heater; A leakage mutual inductor is provided on the line from the output terminal of the contactor to the heater.

3. The heater control circuit according to claim 2, wherein: The leakage mutual inductor is connected to the leakage relay; and the control point of the leakage relay is connected in series to the contact of the contactor.

4. The heater control circuit according to claim 1, wherein: The proximal control circuit further includes: A control power supply connected to the line inlet terminal of the circuit breaker of the main circuit; A fuse, wherein the control power supply is connected to the inlet end of the fuse; the outlet end of the fuse is respectively connected to the inlet end of the proximal stop button, the inlet end of the first normally open contact of the contactor, the inlet end of the first normally closed contact of the contactor, the inlet end of the first auxiliary contact of the circuit breaker, the inlet end of the first auxiliary contact of the leakage relay, and the inlet end of the power supply of the leakage relay; The outgoing line of the proximal stop button is connected to the incoming line of the proximal start button, and the outgoing line of the proximal start button is connected to the remote control circuit; and then connected to the incoming line of the contactor coil and the incoming line of the first intermediate relay coil; the outgoing line of the contactor coil and the outgoing line of the first intermediate relay coil are respectively connected to the neutral line; Connecting the input and output terminals of the start button in parallel with the input and output terminals of the second normally open contact of the contactor; The outgoing wire ends of the first normally open contact of the contactor are respectively connected to the incoming wire ends of the proximal red light indicator and the distal red light indicator; the outgoing wire ends of the proximal red light indicator and the distal red light indicator are connected to the neutral wire; The outgoing wire ends of the incoming wire end of the first normally closed contact of the contactor are respectively connected to the incoming wire ends of the proximal green light indicator and the distal green light indicator; the outgoing wire ends of the proximal green light indicator and the distal green light indicator are connected to the neutral wire; The outgoing line end of the first auxiliary contact of the circuit breaker is connected to the incoming line end of the proximal yellow light indicator; the outgoing line end of the proximal yellow light indicator is connected to the neutral line; The incoming terminal of the first auxiliary contact of the leakage relay is connected to the incoming terminal of the circuit breaker coil; the outgoing terminal of the circuit breaker coil is connected to the neutral line; The outgoing terminal of the leakage relay power supply is connected to the neutral line.

5. The heater control circuit according to claim 4, wherein: The remote control circuit is the output point of the DCS that allows starting or stopping.

6. The heater control circuit according to claim 2, wherein: The 1S1 output terminal and the 1S2 output terminal of the leakage mutual inductor are connected to the seventh terminal and the eighth terminal of the leakage relay respectively.

7. The heater control circuit according to claim 4, wherein: The two normally open contacts of the first intermediate relay coil serve as alarm outputs respectively.

8. The heater control circuit according to any one of claims 1 to 7, characterized in that: The leakage relay of the heater control circuit is a 5SV80006KK leakage relay.

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