Electric leakage detection device for heating system of heating equipment and application of electric leakage detection device

Abstract

The invention belongs to the technical field of grounding detection, and relates to a heating system electric leakage detection device of heating equipment and application thereof. According to the electric leakage detection device for the heating system, the situation that the heating system is cut off due to equipment abnormity is avoided, the electric leakage situation of the equipment can be detected in real time through the electric leakage detection device for the heating system, and the requirement for safely controlling the equipment is met. According to the invention, leakage current can be rapidly detected, a power supply can be cut off in an extremely short time, electric shock accidents of human bodies are effectively avoided, the possibility of fire disasters is reduced, damage of the leakage current to electrical equipment can be prevented, and the service life of the equipment is prolonged. The influence of electric leakage faults on the whole power system can be avoided, and stable operation of other normal circuits is guaranteed; the electric leakage detection device for the heating system is simple and convenient to install and does not need complex operation; and moreover, the daily maintenance is relatively simple, and the normal work is ensured only by regularly detecting and testing.

Description

Technical Field

[0001] The invention belongs to the technical field of grounding detection, and in particular relates to a heating system leakage detection device of a heating device and application thereof. Background Art

[0002] In the field of industrial heating equipment, the heating belt of the heating equipment may leak electricity due to long-term operation in a high-temperature environment, environmental factors, equipment abnormalities, improper operation and other reasons. Leakage may not only cause electric shock accidents, but also pose a serious threat to the life safety of personnel, and may also cause electrical fires, resulting in property losses and other greater safety hazards.

[0003] In the past, leakage protection was not given enough attention or the technical means were limited, and leakage accidents in heating systems occurred from time to time. However, with the advancement of science and technology and the continuous improvement of safety requirements, the application of leakage protection technology in heating systems has become more and more extensive. In the field of industrial heating, if a large electric heating furnace has leakage, it will not only affect the production progress, but also endanger the lives of workers. Therefore, advanced leakage protection devices can quickly cut off the power supply at the moment of leakage to ensure the safety of personnel and equipment.

[0004] The traditional method of ground resistance detection is usually to perform manual detection regularly. This method has many disadvantages. It is not only very inefficient, but also unable to accurately capture the real-time changes in ground resistance. With the continuous advancement of science and technology, people have higher requirements for the reliability and safety of electrical equipment operation. Therefore, a device that can accurately monitor the leakage of heating belts in real time is particularly important. This device can detect abnormal changes in the operating status of the heating system at the first time, and issue an alarm in time to take corresponding measures, thereby effectively avoiding potential electrical safety accidents, ensuring the stable operation of industrial production, and protecting the lives of personnel and equipment.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and to provide a heating system leakage detection device for a heating device and its application.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] On the one hand, the present invention provides a heating system leakage detection device for a heating device, including a heating system circuit, wherein the heating system circuit is connected to a first power supply, wherein the heating system circuit is connected to a programmable logic controller via a current acquisition circuit, wherein the current acquisition circuit is connected to a second power supply, and wherein the current acquisition circuit acquires current values ​​of a phase line A and a phase line B of the heating system circuit, so that the programmable logic controller controls the current on and off of the heating system circuit and the current acquisition circuit through a relay control circuit according to the magnitude of the current value detected in the heating system circuit.

[0009] Specifically, the current acquisition circuit includes a current detection module, an eighth pin of the current detection module is connected to the fourth pin of the programmable logic controller, a ninth pin of the current detection module is connected to the fifth pin of the programmable logic controller, and a first pin of the current detection module is divided into three paths, a first path is connected to the A phase line through the first contact of the second relay and the first fuse in sequence; a second path is connected to the B phase line through the first contact of the fifth relay and the second fuse in sequence; a third path is grounded after passing through the first resistor, the second resistor, the first contact and the second contact of the fourth relay in sequence; the first contact of the second relay is grounded after passing through the second contact of the second relay, the first contact of the third relay and the third resistor in sequence; the first contact of the fifth relay is also connected to the second contact of the second relay; the second pin of the current detection module is connected to the second power supply after passing through the second resistor, the third contact and the fourth contact of the fourth relay in sequence.

[0010] Specifically, the third relay and the fifth relay are single-pole double-throw relays, the second relay is a double-pole double-throw relay, and the fourth relay is a four-pole single-throw relay.

[0011] Specifically, the second power supply is connected to the fourth contact of the fourth relay through the second pin of the test circuit transformer, and the first pin of the test circuit transformer is grounded.

[0012] Specifically, the relay control circuit includes a heating start and stop control circuit for controlling the power supply of the heating belt, an A phase and B phase detection circuit for controlling the current acquisition circuit, and an analog grounding and grounding test circuit. The heating start and stop control circuit, the A phase and B phase detection circuit, the analog grounding and grounding test circuit are all controlled by a programmable logic controller and are all connected to a -24V voltage.

[0013] Specifically, the heating start-stop control circuit includes a first relay having one end connected to a first pin of a programmable logic controller and the other end connected to a -24V voltage.

[0014] Specifically, the A-phase and B-phase detection circuit includes a second relay having one end connected to the second pin of the programming logic controller and the other end connected to a -24V voltage, and a fifth relay having one end connected to the third pin of the programming logic controller and the other end connected to a -24V voltage.

[0015] Specifically, the simulated grounding and grounding test circuit includes a third relay having one end connected to the sixth pin of the programming logic controller and the other end connected to a -24V voltage, and a fourth relay having one end connected to the seventh pin of the programming logic controller and the other end connected to a -24V voltage.

[0016] Specifically, the heating system circuit includes a first power supply, which is connected to the heating belt through a heating system transformer, and the heating system transformer is connected to the heating belt through an A phase line and a B phase line respectively; the heating system transformer realizes the current on and off of the heating system circuit through a first relay.

[0017] Specifically, the programmable logic controller is also connected to a control panel and a display module, and the control panel and the display module include a leakage test button, a heating start button, and a liquid crystal display screen for displaying current values.

[0018] On the other hand, the present invention further provides an application of the heating system leakage detection device as described above, wherein the heating system leakage detection device is applied to leakage detection of heating belts in the field of industrial heating equipment.

[0019] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0020] The present invention adopts a new heating system leakage detection device to avoid cutting off the heating system due to equipment abnormality. Through the heating system leakage detection device, the equipment leakage can be detected in real time, meeting the requirements of safety control equipment. At the same time, the present invention also has the following advantages:

[0021] 1) Ensure personal safety: The heating system leakage detection device of the present invention can quickly detect the leakage current and cut off the power supply in a very short time, effectively avoiding the occurrence of electric shock accidents;

[0022] 2) Prevent electrical fires: The heating system leakage detection device of the present invention can cut off the leakage circuit in time to reduce the possibility of fire;

[0023] 3) Protecting equipment: The heating system leakage detection device of the present invention can prevent the leakage current from damaging the electrical equipment and extend the service life of the equipment;

[0024] 4) Improve the stability of the power system: The heating system leakage detection device of the present invention can cut off the leakage fault circuit in time, avoid the impact of the leakage fault on the entire power system, and ensure the stable operation of other normal circuits;

[0025] 5) Easy to install and maintain: The heating system leakage detection device of the present invention is easy to install and does not require complicated operations; and the daily maintenance is also relatively simple, requiring only regular inspection and testing to ensure its normal operation;

[0026] 6) High safety factor: The heating system leakage detection device of the present invention can determine whether there is any abnormality in the heating system circuit of the equipment through a small voltage test control loop, thereby reducing the risk of testing the heating system circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are incorporated in and constitute a part of this specification and, together with the description, serve to explain the principles of the present invention.

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0029] Figure 1 The figure is a circuit diagram of the heating system leakage detection device of the present invention. DETAILED DESCRIPTION

[0030] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the accompanying drawings. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are only examples consistent with some aspects of the present invention as detailed in the appended claims.

[0031] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0032] Example 1

[0033] See also Figure 1As shown, this embodiment provides a heating system leakage detection device for a heating device, including a heating system circuit, wherein the heating system circuit is connected to a first power supply 1, and the heating system circuit is connected to a programmable logic controller U2 through a current acquisition circuit, and the current acquisition circuit is connected to a second power supply 2. The current acquisition circuit acquires current values ​​of phase A and phase B of the heating system circuit, so that the programmable logic controller U2 controls the current on and off of the heating system circuit and the current acquisition circuit through a relay control circuit according to the magnitude of the current value detected in the heating system circuit.

[0034] Specifically, the current acquisition circuit includes a current detection module U1, an eighth pin of the current detection module U1 is connected to a fourth pin of a programmable logic controller U2, a ninth pin of the current detection module U1 is connected to a fifth pin of the programmable logic controller U2, and a first pin of the current detection module U1 is divided into three paths, a first path is connected to the A phase line through a first contact of a second relay K2 and a first fuse F1 in sequence; a second path is connected to the B phase line through a first contact of a fifth relay K5 and a second fuse F2 in sequence; a third path is connected to ground after passing through a first resistor R1, a second resistor R2, a first contact and a second contact of a fourth relay K4 in sequence; a first contact of the second relay K2 is connected to ground after passing through a second contact of the second relay K2, a first contact of a third relay K3 and a third resistor R3 in sequence; a first contact of the fifth relay K5 is also connected to a second contact of the second relay K2; a second pin of the current detection module U1 is connected to a second power supply 2 after passing through a second resistor R2, a third contact and a fourth contact of a fourth relay K4 in sequence.

[0035] Specifically, the current detection module U1 is connected to the programmable logic controller AI0.0 in the programmable logic controller U2 through the fourth pin and the fifth pin of the programmable logic controller U2.

[0036] Specifically, the second relay K2 is connected to the programmable logic controller DO0.0 in the programming logic controller U2 through the second pin of the programming logic controller U2; the fifth relay K5 is connected to the programmable logic controller DO0.2 in the programming logic controller U2 through the third pin of the programming logic controller U2; the third relay K3 is connected to the programmable logic controller DO0.3 in the programming logic controller U2 through the sixth pin of the programming logic controller U2; the fourth relay K4 is connected to the programmable logic controller DO0.4 in the programming logic controller U2 through the seventh pin of the programming logic controller U2.

[0037] Specifically, the third relay K3 and the fifth relay K5 are single-pole double-throw relays, the second relay K2 is a double-pole double-throw relay, and the fourth relay K4 is a four-pole single-throw relay.

[0038] Specifically, the second power supply 2 is connected to the fourth contact of the fourth relay K4 via the second pin of the test circuit transformer T2, and the first pin of the test circuit transformer T2 is grounded.

[0039] Specifically, the relay control circuit includes a heating start and stop control circuit for controlling the power supply of the heating belt, an A phase and B phase detection circuit for controlling the current acquisition circuit, and an analog grounding and grounding test circuit. The heating start and stop control circuit, the A phase and B phase detection circuit, the analog grounding and grounding test circuit are all controlled by the programmable logic controller U2 and are all connected to a -24V voltage.

[0040] Specifically, the heating start-stop control circuit includes a first relay K1 having one end connected to the first pin of the programmable logic controller U2 and the other end connected to a -24V voltage.

[0041] Specifically, the first relay K1 is connected to the programmable logic controller DO0.0 in the programmable logic controller U2 through the first pin of the programmable logic controller U2.

[0042] Specifically, the A-phase and B-phase detection circuit includes a second relay K2 having one end connected to the second pin of the programming logic controller U2 and the other end connected to a -24V voltage, and a fifth relay K5 having one end connected to the third pin of the programming logic controller U2 and the other end connected to a -24V voltage.

[0043] Specifically, the simulated grounding and grounding test circuit includes a third relay K3 having one end connected to the sixth pin of the programming logic controller U2 and the other end connected to a -24V voltage, and a fourth relay K4 having one end connected to the seventh pin of the programming logic controller U2 and the other end connected to a -24V voltage.

[0044] Specifically, the heating system circuit includes a first power supply 1, which is connected to the heating belt H1 through a heating system transformer T1, and the heating system transformer T1 is connected to the heating belt H1 through an A phase line and a B phase line respectively; the heating system transformer T1 realizes the current switching of the heating system circuit through a first relay K1.

[0045] Specifically, the programmable logic controller U2 is also connected to a control panel and display module U3, and the control panel and display module U3 include a leakage test button, a heating start button, and a liquid crystal display screen for displaying current values.

[0046] Among them, the heating system transformer T1 provides a stable and appropriate voltage for the entire heating system to ensure the normal operation of the heating process.

[0047] The test circuit transformer T2 plays an important role in the detection process to ensure the accuracy and reliability of the test data.

[0048] The heating belt H1 is the core component to realize the heating function.

[0049] The first fuse F1 and the second fuse F2 can be blown in time when the current increases abnormally, thereby protecting the circuit from damage.

[0050] The first relay K1 is used for heating start control and is mainly responsible for controlling the start and stop of the heating system.

[0051] The second relay K2 and the fifth relay K5 respectively accurately detect the A phase line and the B phase line to detect potential problems in time.

[0052] The third relay K3 is mainly used for analog grounding control, and the fourth relay K4 is used for grounding test. The two relays work together to ensure the stability and safety of the grounding system.

[0053] The current detection module U1 is mainly used to accurately measure the magnitude and change of current, providing key data for judging the system status.

[0054] The programmable logic controller U2 is like the brain of the entire system, coordinating the work of various components to achieve automatic operation and intelligent control of the system. For example, in actual applications, when the heating belt H1 starts working, the heating system transformer T1 outputs a stable voltage, and the current detection module U1 closely monitors the current. Once the current exceeds the set threshold, the first fuse F1 and the second fuse F2 will respond quickly and blow to protect the circuit; the programmable logic controller U2 will make control decisions in a timely manner based on the information fed back by each relay and each detection module to ensure the safety and stable operation of the system.

[0055] See also Figure 1 As shown, this embodiment also provides a method for using a heating system leakage detection device for a heating device, and the specific method is as follows:

[0056] Step 1: The heating equipment is ready, waiting for the heating to start, the second power supply 2 is powered on, click the leakage test button, and the test circuit transformer T2 is put into use:

[0057] Step 2, the programmable logic controller DO0.1, the programmable logic controller DO0.3, and the programmable logic controller DO0.4 all output a +24V voltage, the fourth relay K4, the third relay K3, and the second relay K2 are energized, and the current flows from the positive electrode of the test circuit transformer T2 to the auxiliary contacts 12-8 of the fourth relay K4, the auxiliary contacts 9-5 of the fourth relay K4, the second resistor R2, the first resistor R1, the auxiliary contacts 11-14 of the second relay K2, the first fuse F1, the heating wire H1, the second fuse F2, the auxiliary contacts 21-24 of the second relay K2, the auxiliary contacts 11-14 of the third relay K3, the third resistor R3, and the negative electrode of the test circuit transformer T2;

[0058] Step 3: After a delay of 0.5s, the programmable logic controller DO0.2, the programmable logic controller DO0.3, and the programmable logic controller DO0.4 all output a +24V voltage, the fourth relay K4, the third relay K3, and the fifth relay K5 are all energized, the second relay K2 is disconnected, and the current flows from the positive electrode of the test circuit transformer T2 to the auxiliary contacts 12-8 of the fourth relay K4, the auxiliary contacts 9-5 of the fourth relay K4, the second resistor R2, the first resistor R1, the auxiliary contacts 11-14 of the fifth relay K5, the second fuse F2, the heating wire H1, the first fuse F1, the auxiliary contacts 21-22 of the second relay K2, the auxiliary contacts 11-14 of the third relay K3, the third resistor R3, and the negative electrode of the test circuit transformer T2;

[0059] Step 4: After Steps 2 and 3 are automatically cycled and tested three times, the second power supply 2 is disconnected, the PLC DO0.1, PLC DO0.2, PLC DO0.3 and PLC DO0.4 output 0V voltage, and the fourth relay K4, the third relay K3, the second relay K2 and the fifth relay K5 are disconnected (if the requirements are met, proceed to the next stage to detect the heating system circuit);

[0060] Step 5: Turn on the first power supply 1, click the heating start button, and the heating system transformer T1 is put into use;

[0061] Step 6, the programmable logic controller DO0.0 and the programmable logic controller DO0.1 output a +24V voltage, the first relay K1 and the second relay K2 are energized, and the current in the heating system circuit flows from the positive electrode of the heating system transformer T1 to the A phase line, the heating wire H1, the B phase line, and the negative electrode of the heating system transformer T1 in sequence; the current in the current acquisition circuit flows from the positive electrode of the heating system transformer T1 to the first fuse F1, the auxiliary contacts 11-14 of the second relay K2, the first resistor R1, the second resistor R2, the auxiliary contact 9-1 of the fourth relay K4, the auxiliary contact 12-4 of the fourth relay K4, GND, and the negative electrode of the heating system transformer T1 in sequence;

[0062] Step 7: After a delay of 0.5s, the programmable logic controller DO0.0 and the programmable logic controller DO0.2 output a +24V voltage, the first relay K1 and the fifth relay K5 are energized, and the current in the heating system circuit flows from the positive electrode of the heating system transformer T1 to the A phase line, the heating wire H1, the B phase line, and the negative electrode of the heating system transformer T1 in sequence; the current control loop flows from the positive electrode of the heating system transformer T1 to the second fuse F2, the auxiliary contacts 11-14 of the fifth relay K5, the first resistor R1, the second resistor R2, the auxiliary contact 9-1 of the fourth relay K4, the auxiliary contact 12-4 of the fourth relay K4, GND, and the negative electrode of the heating system transformer T1 in sequence;

[0063] Step 8, step 6, 7 are automatically cycled tested, the first power supply 1 is disconnected, the PLC DO0.0, PLC DO0.1, and PLC DO0.2 all output 0V voltage, and the equipment heating operation ends.

[0064] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0065] It should be understood that the present invention is not limited to what has been described above and that various modifications and changes may be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A heating system leakage detection device for a heating device, It is characterized in that The invention comprises a heating system circuit, wherein the heating system circuit is connected to a first power supply (1), the heating system circuit is connected to a programmable logic controller (U2) via a current acquisition circuit, the current acquisition circuit is connected to a second power supply (2), and the current acquisition circuit acquires current values ​​of a phase A line and a phase B line of the heating system circuit, so that the programmable logic controller (U2) controls the current on and off of the heating system circuit and the current acquisition circuit through a relay control circuit according to the magnitude of the current value of the heating system circuit detected.

2. According to claim 1, the heating system leakage detection device, It is characterized in that The current collection circuit comprises a current detection module (U1), an eighth pin of the current detection module (U1) is connected to a fourth pin of a programmable logic controller (U2), a ninth pin of the current detection module (U1) is connected to a fifth pin of the programmable logic controller (U2), and a first pin of the current detection module (U1) is divided into three paths, the first path is connected to the A phase line through the first contact of the second relay (K2) and the first fuse (F1) in sequence; the second path is connected to the B phase line through the first contact of the fifth relay (K5) and the second fuse (F2) in sequence; the third path is connected to the A phase line through the first contact of the fifth relay (K5) and the second fuse (F2) in sequence; The first contact of the second relay (K2) is connected to the ground through the first resistor (R1), the second resistor (R2), the first contact of the fourth relay (K4), and the second contact; the first contact of the second relay (K2) is connected to the ground through the second contact of the second relay (K2), the first contact of the third relay (K3), and the third resistor (R3); the first contact of the fifth relay (K5) is also connected to the second contact of the second relay (K2); and the second pin of the current detection module (U1) is connected to the second power supply (2) through the second resistor (R2), the third contact of the fourth relay (K4), and the fourth contact.

3. According to claim 2, the heating system leakage detection device, It is characterized in that The second power supply (2) is connected to the fourth contact of the fourth relay (K4) via the second pin of the test circuit transformer (T2), and the first pin of the test circuit transformer (T2) is grounded.

4. The heating system leakage detection device according to claim 1, It is characterized in that The relay control circuit includes a heating start-stop control circuit for controlling the power supply of the heating belt, an A-phase and B-phase detection circuit for controlling the current acquisition circuit, and an analog grounding and grounding test circuit. The heating start-stop control circuit, the A-phase and B-phase detection circuit, the analog grounding and grounding test circuit are all controlled by a programmable logic controller (U2) and are all connected to a -24V voltage.

5. The heating system leakage detection device according to claim 4, It is characterized in that The heating start-stop control circuit comprises a first relay (K1) with one end connected to a first pin of a programming logic controller (U2) and the other end connected to a -24V voltage.

6. The heating system leakage detection device according to claim 4, It is characterized in that The A-phase and B-phase detection circuit comprises a second relay (K2) having one end connected to the second pin of the programming logic controller (U2) and the other end connected to a -24V voltage, and a fifth relay (K5) having one end connected to the third pin of the programming logic controller (U2) and the other end connected to a -24V voltage.

7. The heating system leakage detection device according to claim 4, It is characterized in that The simulated grounding and grounding test circuit comprises a third relay (K3) having one end connected to the sixth pin of the programming logic controller (U2) and the other end connected to a -24V voltage, and a fourth relay (K4) having one end connected to the seventh pin of the programming logic controller (U2) and the other end connected to a -24V voltage.

8. The heating system leakage detection device according to claim 1, It is characterized in that The heating system circuit comprises a first power supply (1), the first power supply (1) is connected to a heating belt (H1) via a heating system transformer (T1), the heating system transformer (T1) is connected to the heating belt (H1) via an A phase line and a B phase line respectively; the heating system transformer (T1) realizes current switching of the heating system circuit via a first relay (K1).

9. The heating system leakage detection device according to claim 1, It is characterized in that The programmable logic controller (U2) is also connected to a control panel and a display module (U3), and the control panel and the display module (U3) include a leakage test button, a heating start button, and a liquid crystal display screen for displaying current values.

10. An application of the heating system leakage detection device according to any one of claims 1 to 9, It is characterized in that The heating system leakage detection device is applied to leakage detection of heating belts in the field of industrial heating equipment.

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