Single-phase space heater circuit

Abstract

The utility model relates to a single-phase space heater circuit. A wire inlet end of a circuit breaker is connected with a main circuit; the wire outlet end of the circuit breaker is connected with the wire inlet end of the contactor; any phase of the wire outlet end of the contactor is connected to the space heater; any phase of the wire outlet end of the circuit breaker is connected with a control circuit; a low-voltage line protection device is arranged in the control circuit; the low-voltage line protection device is used for protecting a main circuit of the space heater in the heating process; various protection functions of overcurrent, overvoltage and electric leakage are achieved, and the problems that in an existing heater circuit, the circuit protection design is simple and no other protection measures exist except the short-circuit design, but in a single-phase space heater, the heating requirement is high, and in the existing heater circuit, the heating cost is low are solved. And the use requirements of the space heater circuit cannot be met.

Description

Technical Field

[0001] The embodiments of the utility model relate to a heater circuit, and in particular to a single-phase space heater circuit. Background Art

[0002] In existing heater circuits, the circuit protection design is relatively simple. In addition to the short-circuit design, there are no other protection measures. However, in single-phase space heaters, the heating requirements are relatively high, and the existing heater circuits cannot meet the use requirements of space heater circuits. Utility Model Content

[0003] The purpose of the embodiments of the present invention is to provide a single-phase space heater circuit that meets the requirements of a space heater.

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

[0005] Main circuit;

[0006] a circuit breaker, connected to the main circuit at an incoming line terminal of the circuit breaker;

[0007] A contactor, connected to the inlet terminal of the contactor at the outlet terminal of the circuit breaker;

[0008] A space heater, wherein any one phase of the outgoing terminal of the contactor is connected to the space heater;

[0009] A control circuit connected to any one phase of the outgoing terminal of the circuit breaker;

[0010] A low-voltage line protection device is provided in the control circuit; the low-voltage line protection device protects the main circuit of the space heater during the heating process.

[0011] Furthermore, in the single-phase space heater circuit of the present invention, the main circuit is a three-phase five-wire incoming line.

[0012] Furthermore, in the single-phase space heater circuit of the present utility model, the main circuit further includes:

[0013] A current transformer is provided on the output terminal of the contactor;

[0014] A leakage transformer is provided on one of the phases at the lower end of the current transformer and the neutral line; the leakage transformer is connected to the space heater.

[0015] Furthermore, in the single-phase space heater circuit of the present invention, the main circuit passes through the current transformer and the leakage transformer in a threading manner.

[0016] Furthermore, in the single-phase space heater circuit of the present invention, a second outgoing circuit is connected to the outgoing terminal of the circuit breaker.

[0017] Furthermore, in the single-phase space heater circuit of the present utility model, the control circuit further includes:

[0018] a first control power supply, using any phase of the main circuit as the first control power supply, connected to one end of a power supply of a line protection device after being connected to a first fuse, and the other end of the power supply of the line protection device being connected to a neutral line;

[0019] A second control power supply, using any phase in the second outgoing circuit as the second control power supply and, after being connected to the second fuse, connected to one end of the first normally open contact of the travel switch, the other end of the first normally open contact of the travel switch being respectively connected to the first and third ends of the transfer switch and one end of the first normally closed contact of the travel switch; the other end of the first normally closed contact of the travel switch being connected to the outgoing terminal of the first fuse;

[0020] The other end of the first normally open contact of the travel switch is also connected to one end of the second normally open contact of the line protection device, and the other end of the second normally open contact of the line protection device is connected to one end of the circuit breaker coil; the other end of the circuit breaker coil is connected to the neutral line;

[0021] The other end of the first normally open contact of the travel switch is also connected to one end of the first normally open contact of the contactor, one end of the first normally closed contact of the contactor and one end of the output point of the line protection device;

[0022] The other end of the first normally open contact of the contactor is connected to one end of a red indicator light;

[0023] The other end of the first normally closed contact of the contactor is connected to one end of the green indicator light; the other end of the red indicator light and the other end of the green indicator light are both connected to the neutral line;

[0024] The second end of the transfer switch is connected to one end of the main motor interlock switch;

[0025] The fourth end of the transfer switch is connected to the other end of the main motor interlock switch;

[0026] The other end of the main motor interlock switch is connected to one end of the first normally closed contact of the line protection device; the other end of the first normally closed contact of the line protection device is connected to one end of the contactor coil; the other end of the contactor coil is connected to the neutral line.

[0027] Furthermore, in the single-phase space heater circuit of the present invention, the X3-1 terminal, the X3-2 terminal, and the X3-3 terminal of the line protection device are respectively connected to one end of the sensing side of the current transformer; the other end of the sensing side of the current transformer is short-circuited and connected to the X3-4 terminal of the line protection device;

[0028] The secondary side of the current transformer is connected to the X3-5 terminal, the X3-6 terminal, the X3-7 terminal and the X3-4 terminal of the line protection device respectively; the second outgoing line circuit is connected to the primary side of the current transformer respectively;

[0029] Connect the two ends of the induction side of the leakage transformer to the X2-9 and X2-8 terminals of the line protection device;

[0030] Connect one end of the second normally open contact of the contactor to the X2-2 terminal of the line protection device;

[0031] Connect one end of the first normally open contact of the circuit breaker to the X2-4 terminal of the line protection device;

[0032] Connect one end of the second normally open contact of the circuit breaker to the X2-1 terminal of the line protection device;

[0033] The other end of the second normally open contact, the other end of the first normally open contact of the circuit breaker, and the other end of the second normally open contact of the circuit breaker are connected and then connected to the X2-7 terminal of the line protection device;

[0034] The communication loop is connected to the X5-14 terminal and the X5-15 terminal of the line protection device.

[0035] Furthermore, in the single-phase space heater circuit of the present invention, the model of the line protection device is the LL510P-1RNL01 line protection device.

[0036] Furthermore, in the single-phase space heater circuit of the present invention, both ends of the first normally closed contact of the line protection device are connected to the X1-5 terminal and the X1-6 terminal of the line protection device.

[0037] Furthermore, in the single-phase space heater circuit of the present invention, both ends of the second normally open contact of the line protection device are connected to the X1-7 terminal and the X1-8 terminal of the line protection device.

[0038] Compared with the prior art, the implementation method of the present invention adopts the method of connecting the main circuit at the incoming end of the circuit breaker; connecting the incoming end of the contactor to the outgoing end of the circuit breaker; connecting any one phase of the outgoing end of the contactor to the space heater; connecting any one phase of the outgoing end of the circuit breaker to the control circuit; arranging a low-voltage line protection device in the control circuit; the low-voltage line protection device protects the main circuit of the space heater during the heating process; realizing multiple protection functions such as overcurrent, overvoltage and leakage, and solving the technical problem that in the existing heater circuit, the circuit protection design is relatively simple and there is no other protection measure except the short-circuit design, but in the single-phase space heater, the heating requirements are relatively high and the existing heater circuit cannot meet the use requirements of the space heater circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the main circuit of the utility model;

[0040] Figure 2 This is a schematic diagram of the control circuit of the utility model;

[0041] Figure 3 This is a connection diagram of the line protection device of the present utility model. DETAILED DESCRIPTION

[0042] 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.

[0043] The embodiment of the present utility model relates to a single-phase space heater circuit, such as Figure 1 、 Figure 2 、 Figure 3 Shown, including:

[0044] The main circuits L1, L2, L3, and N serve as the power source for the single-phase space heater circuit in this embodiment;

[0045] The main circuits L1, L2, L3, and N are connected to the incoming line terminal of the circuit breaker QF; the circuit breaker QF is used to control the switching of the main circuits L1, L2, L3, and N;

[0046] The output terminal of the circuit breaker QF is connected to the input terminal of the contactor KM; the contactor KM is used to control the on and off of the main circuits L1, L2, L3, and N.

[0047] Any one phase of the outgoing terminal of the contactor KM is connected to a space heater; the space heater is used for heating;

[0048] Connect a control circuit to any phase of the output terminal of the circuit breaker QF; the control circuit is used to control the single-phase space heater circuit in this embodiment;

[0049] A low-voltage line protection unit (FCU) is installed in the control circuit to protect the main circuits L1, L2, L3, and N of the space heater during the heating process. The FCU provides multiple protection functions during the heating process, including overcurrent, overvoltage, and leakage protection. This solves the technical problem that existing heater circuits, which have relatively simple circuit protection designs and lack other protection measures besides short-circuit protection, cannot meet the high heating requirements of single-phase space heaters and are therefore unable to meet these requirements.

[0050] In order to achieve the above technical effects, in the single-phase space heater circuit of this embodiment, as shown in FIG. Figure 1 、 Figure 2 、 Figure 3 As shown, the main circuits L1, L2, L3, and N are three-phase five-wire incoming lines, which is more suitable for the single-phase space heater circuit of this embodiment.

[0051] In order to achieve the above technical effects, in the single-phase space heater circuit of this embodiment, as shown in FIG. Figure 1 、 Figure 2 、 Figure 3 As shown, the main circuit L1, L2, L3, N also includes:

[0052] A current transformer TD is provided on the outgoing terminal of the contactor KM; the current transformer TD is used to detect the current of the main circuits L1, L2, L3, and N;

[0053] A leakage current transformer TA0 is installed between one phase and the neutral line N at the lower end of the current transformer TD. The leakage current transformer TA0 is connected to the space heater. The leakage current transformer TA0 is used to detect leakage and implement leakage protection.

[0054] In order to achieve the above technical effects, in the single-phase space heater circuit of this embodiment, as shown in FIG. Figure 1 、 Figure 2 、 Figure 3 As shown, the main circuits L1, L2, L3, and N pass through the current transformer TD and the leakage transformer TA0 by threading. The threading arrangement of the current transformer TD and the leakage transformer TA0 enables high current in the main circuits L1, L2, L3, and N, thereby achieving high power for the space heater.

[0055] In order to achieve the above technical effects, in the single-phase space heater circuit of this embodiment, as shown in FIG. Figure 1 、 Figure 2 、 Figure 3 As shown, the outgoing terminal of the circuit breaker QF is connected to the second outgoing circuit L11, L12, L13, N. The second outgoing circuit L11, L12, L13, N is used to connect to the line protection device FCU to realize the function of detecting voltage loss.

[0056] In order to achieve the above technical effects, in the single-phase space heater circuit of this embodiment, as shown in FIG. Figure 1 、 Figure 2 、 Figure 3 As shown, the control circuit further includes:

[0057] Any phase of the main circuit L1, L2, L3, and N is used as the first control power supply L1. After connecting the first fuse FU1, it is connected to one end of the power supply of the line protection device FCU, and the other end of the power supply of the line protection device FCU is connected to the neutral line N; the first control power supply L1 is used to provide power to the line protection device FCU.

[0058] Any phase of the second outgoing circuit L11, L12, L13, N is used as the second control power supply L11 and, after connecting to the second fuse FU2, is connected to one end of the first normally open contact of the travel switch S20. The other end of the first normally open contact of the travel switch S20 is respectively connected to the first end point and the third end point of the transfer switch SA and one end of the first normally closed contact of the travel switch S20; the other end of the first normally closed contact of the travel switch S20 is connected to the outgoing end of the first fuse FU1; the second control power supply L11 serves as the second control power supply, and the travel switch S20 can realize the detection of the working position and test position of the circuit breaker QF.

[0059] The other end of the first normally open contact of the limit switch S20 is also connected to one end of the second normally open contact FCU-2 of the line protection device, and the other end of the second normally open contact FCU-2 of the line protection device is connected to one end of the circuit breaker coil QF1; the other end of the circuit breaker coil QF1 is connected to the neutral line N; the above circuit realizes the function of ground protection tripping.

[0060] The other end of the first normally open contact of the travel switch S20 is also connected to one end of the first normally open contact KM-1 of the contactor, one end of the first normally closed contact KM-2 of the contactor, and one end of the output point of the line protection device FCU;

[0061] The other end of the first normally open contact KM-1 of the contactor is connected to one end of the red indicator light HR;

[0062] The other end of the first normally closed contact KM-2 of the contactor is connected to one end of the green indicator light GR. The other ends of the red indicator light HR and the other ends of the green indicator light GR are both connected to the neutral line N. The red indicator light HR is used to indicate the running state. The green indicator light GR is used to indicate the stopping state.

[0063] A second terminal of the transfer switch SA is connected to one terminal of the main motor interlock switch KX;

[0064] The fourth end of the transfer switch SA is connected to the other end of the main motor interlock switch KX; the main motor interlock switch KX is mainly used to ensure that the single-phase space heater circuit of this embodiment can only work when the main motor is working.

[0065] The other end of the main motor interlock switch KX is connected to one end of the first normally closed contact FCU-1 of the line protection device; the other end of the first normally closed contact FCU-1 of the line protection device is connected to one end of the contactor coil KM1; the other end of the contactor coil KM1 is connected to the neutral line N. This circuit controls the contactor (KM) on and off.

[0066] In order to achieve the above technical effects, in the single-phase space heater circuit of this embodiment, as shown in FIG. Figure 1 、 Figure 2 、 Figure 3 As shown, the X3-1, X3-2, and X3-3 terminals of the line protection device FCU are respectively connected to one end of the sensing side of the current transformer TD; the other end of the sensing side of the current transformer TD is short-circuited to the X3-4 terminal of the line protection device FCU; this is used to detect the current magnitude and implement overcurrent protection.

[0067] The secondary side of the current transformer TD is connected to the X3-5, X3-6, X3-7 and X3-4 terminals of the line protection device FCU respectively; the primary side of the current transformer TD is connected to the second outgoing line circuit L11, L12, L13 and N respectively; it is used to detect the voltage and implement overvoltage and undervoltage protection.

[0068] Connect the two sensing ends of the leakage transformer TA0 to the X2-9 and X2-8 terminals of the line protection device FCU to detect leakage current and implement leakage protection.

[0069] Connect one end of the second normally open contact KM-3 of the contactor to the X2-2 terminal of the line protection device FCU;

[0070] Connect one end of the first normally open contact QF-1 of the circuit breaker to the X2-4 terminal of the line protection device FCU;

[0071] Connect one end of the second normally open contact QF-2 of the circuit breaker to the X2-1 terminal of the line protection device FCU;

[0072] The above circuit is used to detect the circuit breaker status, contactor status, and circuit breaker tripping status, ensuring that it is effective when the circuit breaker and contactor are working.

[0073] The other end of the second normally open contact KM-3, the other end of the first normally open contact QF-1 of the circuit breaker, and the other end of the second normally open contact QF-2 of the circuit breaker are connected, and then connected to the X2-7 terminal of the line protection device FCU;

[0074] Connect the communication circuit to the X5-14 and X5-15 terminals of the line protection device FCU.

[0075] In order to achieve the above technical effects, in the single-phase space heater circuit of this embodiment, as shown in FIG. Figure 1 、 Figure 2 、 Figure 3 As shown, the model of the line protection device FCU is the LL510P-1RNL01 line protection device.

[0076] In order to achieve the above technical effects, in the single-phase space heater circuit of this embodiment, as shown in FIG. Figure 1 、 Figure 2 、 Figure 3 As shown, the two ends of the first normally closed contact FCU-1 of the line protection device are connected to the X1-5 and X1-6 terminals of the line protection device FCU, thereby realizing the normally closed output of the line protection device FCU status.

[0077] In order to achieve the above technical effects, in the single-phase space heater circuit of this embodiment, as shown in FIG. Figure 1 、 Figure 2 、 Figure 3 As shown, the two ends of the second normally open contact FCU-2 of the line protection device are connected to terminals X1-7 and X1-8 of the line protection device FCU. This implements a normally closed output of the line protection device FCU status. This FCU status output ensures that the single-phase space heater circuit of this embodiment operates properly only when the line protection device FCU is operating normally.

[0078] 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 single-phase space heater circuit, characterized in that, include: Main circuit (L1, L2, L3, N); a circuit breaker (QF), wherein the main circuit (L1, L2, L3, N) is connected at an incoming line terminal of the circuit breaker (QF); A contactor (KM), wherein the line-in terminal of the contactor (KM) is connected to the line-out terminal of the circuit breaker (QF); A space heater, wherein any one phase of the outgoing terminal of the contactor (KM) is connected to the space heater; a control circuit connected to any one phase of the outgoing terminal of the circuit breaker (QF); A low-voltage line protection device (FCU) is provided in the control circuit; the low-voltage line protection device (FCU) protects the main circuit (L1, L2, L3, N) of the space heater during the heating process.

2. The single-phase space heater circuit according to claim 1, characterized in that The main circuit (L1, L2, L3, N) is a three-phase five-wire system.

3. The single-phase space heater circuit according to claim 2, characterized in that The main circuit (L1, L2, L3, N) further includes: a current transformer (TD), which is arranged on the outgoing terminal of the contactor (KM); A leakage transformer (TA0) is provided on one phase and a neutral line (N) at the lower end of the current transformer (TD); the leakage transformer (TA0) is connected to a space heater.

4. The single-phase space heater circuit according to claim 1, characterized in that The main circuit (L1, L2, L3, N) passes through the current transformer (TD) and the leakage transformer (TA0) in a threading manner.

5. The single-phase space heater circuit according to claim 1, characterized in that A second outgoing line circuit (L11, L12, L13, N) is connected to the outgoing line terminal of the circuit breaker (QF).

6. The single-phase space heater circuit according to claim 1, wherein: The control circuit further includes: A first control power supply (L1), using any one phase of the main circuit (L1, L2, L3, N) as the first control power supply (L1), connected to one end of a power supply of a line protection unit (FCU) after being connected to a first fuse (FU1), and the other end of the power supply of the line protection unit (FCU) is connected to a neutral line (N); A second control power supply (L11), wherein any one phase of the second outgoing circuit (L11, L12, L13, N) is used as the second control power supply (L11), and after being connected to the second fuse (FU2), the second control power supply (L11) is connected to one end of the first normally open contact of the travel switch (S20), the other end of the first normally open contact of the travel switch (S20) being respectively connected to the first end point and the third end point of the transfer switch (SA) and one end of the first normally closed contact of the travel switch (S20); the other end of the first normally closed contact of the travel switch (S20) being connected to the outgoing end of the first fuse (FU1); The other end of the first normally open contact of the travel switch (S20) is also connected to one end of the second normally open contact (FCU-2) of the line protection device, and the other end of the second normally open contact (FCU-2) of the line protection device is connected to one end of the circuit breaker coil (QF1); the other end of the circuit breaker coil (QF1) is connected to the neutral line (N); The other end of the first normally open contact of the travel switch (S20) is also connected to one end of the first normally open contact (KM-1) of the contactor, one end of the first normally closed contact (KM-2) of the contactor, and one end of the output point of the line protection device (FCU); The other end of the first normally open contact (KM-1) of the contactor is connected to one end of the red indicator light (HR); The other end of the first normally closed contact (KM-2) of the contactor is connected to one end of the green indicator light (GR); the other end of the red indicator light (HR) and the other end of the green indicator light (GR) are both connected to the neutral line (N); The second end of the transfer switch (SA) is connected to one end of the main motor interlock switch (KX); The fourth end of the transfer switch (SA) is connected to the other end of the main motor interlock switch (KX); The other end of the main motor interlock switch (KX) is connected to one end of the first normally closed contact (FCU-1) of the line protection device; the other end of the first normally closed contact (FCU-1) of the line protection device is connected to one end of the contactor coil (KM1); the other end of the contactor coil (KM1) is connected to the neutral line (N).

7. The single-phase space heater circuit according to claim 1, wherein: The X3-1, X3-2, and X3-3 terminals of the line protection unit (FCU) are respectively connected to one end of the sensing side of the current transformer (TD); the other end of the sensing side of the current transformer (TD) is short-circuited and connected to the X3-4 terminal of the line protection unit (FCU); The secondary side of the current transformer (TD) is respectively connected to the X3-5 terminal, the X3-6 terminal, the X3-7 terminal and the X3-4 terminal of the line protection unit (FCU); the primary side of the current transformer (TD) is respectively connected to the second outgoing line circuit (L11, L12, L13, N); Connect the two ends of the sensing side of the leakage transformer (TA0) to the X2-9 and X2-8 terminals of the line protection device (FCU); Connect one end of the second normally open contact (KM-3) of the contactor to the X2-2 terminal of the line protection unit (FCU); Connect one end of the first normally open contact (QF-1) of the circuit breaker to the X2-4 terminal of the line protection unit (FCU); Connect one end of the second normally open contact (QF-2) of the circuit breaker to the X2-1 terminal of the line protection unit (FCU); The other end of the second normally open contact (KM-3), the other end of the first normally open contact (QF-1) of the circuit breaker, and the other end of the second normally open contact (QF-2) of the circuit breaker are connected and then connected to the X2-7 terminal of the line protection unit (FCU); The communication loop is connected to the X5-14 and X5-15 terminals of the line protection unit (FCU).

8. The single-phase space heater circuit according to claim 6, wherein: The model of the line protection unit (FCU) is the line protection unit of model LL510P-1RNL01.

9. The single-phase space heater circuit according to claim 6, characterized in that Both ends of the first normally closed contact (FCU-1) of the line protection device are connected to the X1-5 terminal and the X1-6 terminal of the line protection device (FCU).

10. The single-phase space heater circuit of claim 7, wherein: The two ends of the second normally open contact (FCU-2) of the line protection device are connected to the X1-7 terminal and the X1-8 terminal of the line protection device (FCU).

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