Thermal protection detection device

Abstract

The utility model discloses a thermal protection detection device. The thermal protection detection device comprises a heating circuit module, a first detection circuit module and a second detection circuit module. The heating circuit module comprises a heating module, a control module, a first switch module and a second switch module which are connected in series, the first switch module is connected between the control module and the first connecting end of the heating module in series, and the second switch module is connected between the control module and the second connecting end of the heating module in series. The first and second detection circuit modules are respectively connected in parallel with the first and second switch modules, and are used for accessing the first and second to-be-tested electric heating elements. When the first switch module is switched off and the second switch module is switched on, the first detection circuit module and the heating circuit module are connected in series to form a first detection circuit; when the first switch module is switched on and the second switch module is switched off, the second detection circuit module and the heating circuit module are connected in series to form a second detection circuit. And by switching the detection circuit, the test efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal protection of electrical facilities, in particular to a thermal protection detection device. Background Art

[0002] Regarding the general safety requirements for household and similar electrical appliances, Chapter 19.5 of the national standard GB4706.1-2005 sets new requirements for whether the thermal protection function of tubular outer sheaths or embedded electric heating elements can operate normally.

[0003] In conventional technology, individuals build test platforms using crude wiring connections and manually test each of the thermal protection circuits, either the tubular sheath or the embedded heating element, to ensure they are functioning properly. While implementing this existing technology, the inventors discovered that manually testing each component individually for thermal protection is difficult, inefficient, and carries significant risks. Therefore, there is a need for a testing device that efficiently completes tests while protecting the operator's safety. Utility Model Content

[0004] The main purpose of the utility model is to provide a thermal protection detection device, thereby overcoming the deficiencies in the prior art.

[0005] In order to achieve the above-mentioned purpose of the utility model, the technical solutions adopted by the utility model include:

[0006] The utility model provides a thermal protection detection device, which specifically includes:

[0007] The heating circuit module includes a heating module, a control module, a first switch module, and a second switch module connected in series. The first switch module is connected in series between the first connection end of the control module and the heating module, and the second switch module is connected in series between the second connection end of the control module and the heating module.

[0008] a first detection circuit module, the first detection circuit module being connected in parallel with the first switch module, and the first detection circuit module being used for electrically connecting to a first electric heating element to be tested;

[0009] a second detection circuit module, the second detection circuit module being connected in parallel with the second switch module, and the second detection circuit module being configured to be electrically connected to a second electric heating element to be tested;

[0010] When the first switch module is in an open state and the second switch module is in a closed state, the first detection circuit module is connected in series with the heating circuit module to form a first detection circuit for detecting the first electric heating element to be tested; when the first switch module is in a closed state and the second switch module is in an open state, the second detection circuit module is connected in series with the heating circuit module to form a second detection circuit for detecting the second electric heating element to be tested.

[0011] Furthermore, the control module includes a first circuit switch, a second circuit switch, a first switch, and a second switch;

[0012] When the first switch disconnects the first switch module, the second switch connects to the second switch module, and the first loop switch connects to the first detection circuit module and the second loop switch disconnects the second detection circuit module, the first detection circuit module and the heating circuit module are connected in series to form a first detection circuit for detecting the first electric heating element to be tested;

[0013] When the first switch is connected to the first switch module, the second switch is disconnected from the second switch module, and the first loop switch is disconnected from the first detection circuit module and the second loop switch is connected to the second detection circuit module, the second detection circuit module is connected in series with the heating circuit module to form a second detection circuit for detecting the second electric heating element to be tested.

[0014] Furthermore, the thermal protection detection device also includes a first overload relay and a second overload relay. The parallel circuit structure formed by the first detection circuit module and the first switch module is arranged in series with the first overload relay, and the parallel circuit structure formed by the second detection circuit module and the second switch module is arranged in series with the second overload relay.

[0015] Furthermore, the control module further includes a detection indicating module, which is used to indicate the thermal protection detection results of the first electric heating element to be tested and the second electric heating element to be tested.

[0016] Furthermore, the detection indication module includes an indicator light, which is connected in series with the first detection circuit module and is used to determine the thermal protection detection result according to the current value.

[0017] Furthermore, the detection indication module includes a sound alarm, and the sound alarm is connected in series with the heating circuit module.

[0018] Furthermore, the thermal protection detection device also includes a shell, the heating circuit module, the first detection circuit module and the second detection circuit module are enclosed in an assembly cavity formed by the shell, and the shell is grounded.

[0019] Furthermore, the thermal protection detection device also includes a control panel, which is connected to the control module, and the control panel includes a first circuit switch button connected to the first circuit switch, a second circuit switch button connected to the second circuit switch, a first switch button connected to the first switch, and a second switch button connected to the second switch.

[0020] Compared with the prior art, the advantages of the present invention include at least:

[0021] This utility model provides a thermal protection detection device that converts conventional manual testing into mechanical testing by switching between a first detection circuit and a second detection circuit via a control module, thereby improving testing efficiency and accuracy. Furthermore, control of the test circuits via buttons on a control panel is simple and easy to operate, while also ensuring the safety of the tester. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a thermal protection detection device provided by an embodiment of the present utility model.

[0023] 11. Heating module; 12. Control module; 13. First switch module; 14. Second switch module; 15. First detection circuit module; 16. Second detection circuit module; 17. First overload relay; 18. Second overload relay. DETAILED DESCRIPTION

[0024] In view of the shortcomings of the existing technology, the inventors of this case, after long-term research and extensive practice, have proposed the technical solution of this utility model. The following will further explain this technical solution, its implementation process and principles.

[0025] Please refer to Figure 1 This embodiment provides a thermal protection detection device, including a heating circuit module, a first detection circuit module 15, and a second detection circuit module 16.

[0026] The heating circuit module tests the thermal protection performance of the first detection circuit module 15 and the second detection circuit module 16 by heating. When the heating circuit module is heated to a certain temperature, if the first detection circuit module 15 can promptly cut off the circuit, the first detection circuit module 15 has passed the test. Similarly, if the second detection circuit module 16 can promptly cut off the circuit, the second detection circuit module 16 has passed the test. The following describes the specific structures of the heating circuit module, the first detection circuit module 15, and the second detection circuit module 16.

[0027] The heating circuit module includes a heating module 11, a control module 12, a first switch module 13, and a second switch module 14 connected in series. The first switch module 13 is connected in series between the control module 12 and the first connection end of the heating module 11, and the second switch module 14 is connected in series between the control module 12 and the second connection end of the heating module 11.

[0028] The heating module 11 can be an electric heating tube. This is a tubular heating element composed of a metal tube, spirally wound resistance wire, and crystalline magnesium oxide powder. The high-temperature resistance wire is evenly distributed within a stainless steel seamless tube, and the gaps are filled with crystalline magnesium oxide powder, which has excellent thermal conductivity and insulation properties. When current flows through the high-temperature resistance wire, the heat generated diffuses through the magnesium oxide powder to the surface of the metal tube, where it is then transferred to the heated component or the air, achieving heating.

[0029] The control module 12 here is at least used for switching the detection circuit.

[0030] The first switch module 13 here can be understood as the first AC contactor, and the second switch module 14 can be understood as the second AC contactor. The AC contactor is an automatic switching appliance that connects or disconnects the main circuit of the motor or load. It uses electromagnetic force to close or disconnect the switch, and is suitable for high-voltage circuits that are frequently operated and remotely controlled, and has the protection performance of low-voltage release. When the capacity is above 10A, the AC contactor is provided with an arc extinguishing device. Generally, the AC contactor adopts three arc extinguishing methods: double-break electric arc extinguishing, longitudinal seam arc extinguishing and grid arc extinguishing to eliminate the arc generated by the moving and static contacts during the opening and closing process. The AC contactor also includes auxiliary components such as reaction springs, buffer springs, contact pressure springs, transmission mechanisms, bases and terminals.

[0031] The first detection circuit module 15 is connected in parallel with the first AC contactor and is used to electrically connect to the first electric heating element to be tested. The second detection circuit module 16 is connected in parallel with the second AC contactor and is used to electrically connect to the second electric heating element to be tested.

[0032] In a specific implementation scenario, the first electric heating element to be tested may be a thermal circuit breaker, and the second electric heating element to be tested may be a thermal fuse. The thermal circuit breaker is arranged in parallel with the first AC contactor, and the thermal fuse is arranged in parallel with the second AC contactor. When the first AC contactor is in the open state and the second AC contactor is in the closed state, the thermal fuse is bypassed, and the thermal circuit breaker is connected in series with the heating circuit module to form a first detection circuit for detecting the thermal circuit breaker. When the thermal circuit breaker can normally cut off the first detection circuit, it indicates that the thermal circuit breaker test has passed. Similarly, when the first AC contactor is in the closed state and the second AC contactor is in the open state, the thermal circuit breaker is bypassed, and the thermal fuse is connected in series with the heating circuit module to form a second detection circuit for detecting the thermal fuse. When the thermal fuse can normally cut off the second detection circuit, it indicates that the thermal fuse test has passed.

[0033] In a preferred embodiment, the control module 12 includes a first circuit switch, a second circuit switch, a first switch, and a second switch.

[0034] In another specific implementation scenario, the first electric heating element to be tested may be a thermal circuit breaker, and the second electric heating element to be tested may be a thermal fuse. The thermal circuit breaker is arranged in parallel with the first AC contactor, and the thermal fuse is arranged in parallel with the second AC contactor. Here, the first circuit switch is used to control the thermal circuit breaker. The second circuit switch is used to control the thermal fuse. The first switch is used to control the first AC contactor. The second switch is used to control the second AC contactor. When the first AC contactor is in the open state, the second AC contactor is in the closed state, and the thermal fuse is in the open state, the thermal circuit breaker is connected in series with the heating circuit module, forming a first detection circuit for detecting the thermal circuit breaker. When the thermal circuit breaker can normally interrupt the first detection circuit, it indicates that the thermal circuit breaker test has passed. Similarly, when the first AC contactor is in the closed state, the second AC contactor is in the open state, and the thermal circuit breaker is in the open state, the thermal circuit breaker is bypassed, and the thermal fuse is connected in series with the heating circuit module, forming a second detection circuit for detecting the thermal fuse. When the thermal link can cut off the second detection circuit normally, it means that the thermal link test has passed.

[0035] In a preferred embodiment, the thermal protection detection device further includes a first overload relay 17 and a second overload relay 18. The parallel circuit structure formed by the first detection circuit module 15 and the first switch module 13 is arranged in series with the first overload relay 17, and the parallel circuit structure formed by the second detection circuit module 16 and the second switch module 14 is arranged in series with the second overload relay 18. In this embodiment, the first overload relay 17 and the second overload relay 18 are respectively configured to disconnect the circuit when the current in the first detection circuit module 15 and the second detection circuit module 16 exceeds their respective preset values, thereby preventing safety accidents caused by excessive circuit current.

[0036] In a preferred embodiment, the control module 12 further includes a power switch.

[0037] In a more preferred embodiment, the control module 12 further includes a detection indication module, which is used to indicate the thermal protection detection results of the first electric heating element to be tested and the second electric heating element to be tested.

[0038] Preferably, the detection indication module includes an indicator light, which is connected in series with the first detection circuit module 15 and is used to judge the thermal protection detection result according to the current value. The indicator light includes a first indicator light and a second indicator light. When the first electric heating element to be tested cuts off the first detection circuit, the first indicator light is on; otherwise, the second indicator light is on. Specifically, the first indicator light here can be green, indicating that the first electric heating element to be tested has passed the test. The second indicator light is red, indicating that the first electric heating element to be tested has failed the test. Similarly, when the second electric heating element to be tested cuts off the second detection circuit, the first indicator light is on, indicating that the second electric heating element to be tested has passed the test; otherwise, the second indicator light is on, indicating that the second electric heating element to be tested has failed the test.

[0039] Preferably, the detection indication module further includes a sound alarm, which is connected in series with the heating circuit module. The sound alarm here can be a buzzer. When the first electric heating element to be tested cuts off the first detection circuit, the buzzer does not make a sound. When the first electric heating element to be tested cannot cut off the first detection circuit, the buzzer makes a sound to alarm, indicating that the first electric heating element to be tested has failed the test. Similarly, when the second electric heating element to be tested cuts off the second detection circuit, the buzzer does not make a sound. When the second electric heating element to be tested cannot cut off the second detection circuit, the buzzer makes a sound to alarm, indicating that the second electric heating element to be tested has failed the test.

[0040] In a preferred embodiment, the thermal protection detection device further includes a housing, and the heating circuit module, the first detection circuit module 15, and the second detection circuit module 16 are enclosed within an assembly cavity formed by the housing. The housing is grounded. The housing can be understood as a vertical box or a suitcase. Enclosing the heating circuit module, the first detection circuit module 15, and the second detection circuit module 16 within the vertical box or suitcase facilitates portability and testing.

[0041] In a more preferred embodiment, the thermal protection detection device also includes a control panel, which is connected to the control module 12, and the control panel includes a first circuit switch button connected to the first circuit switch, a second circuit switch button connected to the second circuit switch, a first switch button connected to the first switch, and a second switch button connected to the second switch.

[0042] It should be understood that the above embodiments are merely illustrative of the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention are intended to fall within the scope of protection of the present invention.

Claims

1. A thermal protection detection device, characterized in that: Specifically include: The heating circuit module includes a heating module, a control module, a first switch module, and a second switch module connected in series. The first switch module is connected in series between the first connection end of the control module and the heating module, and the second switch module is connected in series between the second connection end of the control module and the heating module. a first detection circuit module, the first detection circuit module being connected in parallel with the first switch module, and the first detection circuit module being used for electrically connecting to a first electric heating element to be tested; a second detection circuit module, the second detection circuit module being connected in parallel with the second switch module, and the second detection circuit module being configured to be electrically connected to a second electric heating element to be tested; When the first switch module is in an open state and the second switch module is in a closed state, the first detection circuit module is connected in series with the heating circuit module to form a first detection circuit for detecting the first electric heating element to be tested; when the first switch module is in a closed state and the second switch module is in an open state, the second detection circuit module is connected in series with the heating circuit module to form a second detection circuit for detecting the second electric heating element to be tested.

2. The thermal protection detection device according to claim 1, characterized in that: The control module includes a first circuit switch, a second circuit switch, a first switch, and a second switch; When the first switch disconnects the first switch module, the second switch connects to the second switch module, and the first loop switch connects to the first detection circuit module and the second loop switch disconnects the second detection circuit module, the first detection circuit module and the heating circuit module are connected in series to form a first detection circuit for detecting the first electric heating element to be tested; When the first switch is connected to the first switch module, the second switch is disconnected from the second switch module, and the first loop switch is disconnected from the first detection circuit module and the second loop switch is connected to the second detection circuit module, the second detection circuit module is connected in series with the heating circuit module to form a second detection circuit for detecting the second electric heating element to be tested.

3. The thermal protection detection device according to claim 1, characterized in that: It also includes a first overload relay and a second overload relay. The parallel circuit structure formed by the first detection circuit module and the first switch module is arranged in series with the first overload relay, and the parallel circuit structure formed by the second detection circuit module and the second switch module is arranged in series with the second overload relay.

4. The thermal protection detection device according to claim 1, characterized in that: The control module further comprises a detection indicating module, which is used to indicate the thermal protection detection results of the first electric heating element to be tested and the second electric heating element to be tested.

5. The thermal protection detection device according to claim 4, characterized in that: The detection indication module includes an indicator light, which is connected in series with the first detection circuit module and is used to determine the thermal protection detection result according to the current value.

6. The thermal protection detection device according to claim 4, characterized in that: The detection indication module includes a sound alarm, and the sound alarm is connected in series with the heating circuit module.

7. The thermal protection detection device according to claim 1, characterized in that: It also includes a shell, the heating circuit module, the first detection circuit module and the second detection circuit module are encapsulated in an assembly cavity formed by the shell, and the shell is grounded.

8. The thermal protection detection device according to claim 2, characterized in that: It also includes a control panel, which is connected to the control module, and includes a first circuit switch button connected to the first circuit switch, a second circuit switch button connected to the second circuit switch, a first switch button connected to the first switch, and a second switch button connected to the second switch.

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