Testing device and residual-current circuit breaker

Abstract

The utility model provides a testing device and a residual-current circuit breaker, and relates to the technical field of circuit breakers, the testing device comprises a testing button, a reset testing torsion spring, a contact piece and a magnet yoke, the reset testing torsion spring comprises a magnet yoke contact part, a button connecting part, a spring coil, a supporting part and a contact piece connecting part which are arranged in sequence, and the magnet yoke contact part is obliquely arranged. The button connecting part is connected with a test button, the contact piece connecting part is used for being connected with a contact piece, and the contact piece is connected with an electronic assembly board through a test lead. By adopting the design of the special-shaped torsion spring and the contact piece, the electric gap between the torsion spring and the magnet yoke is increased, the operation safety is improved, the reset test torsion spring in the scheme is good in deformation stability, large in torsion moment and good in reset performance, the service life is prolonged, a test device is stable and reliable in operation, and the product quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a testing device and a residual current circuit breaker. Background Technology

[0002] Traditional test devices generally consist of two parts, including a button reset spring and a test spring or spring. Their structure has the following defects: (1) The torsion spring structure occupies a large space, making it difficult to further improve the product integration; (2) The torsion spring has a small working stroke and a small electrical clearance with the magnetic yoke, resulting in low operational safety; (3) The torsion spring has general deformation stability and reset performance. In response to the above defects, this application is proposed. Utility Model Content

[0003] The purpose of this invention is to provide a testing device and a leakage circuit breaker, which solves the problem that the large size and short working stroke of the torsion spring in the current testing device make it difficult to further improve the product integration and safety.

[0004] To address the aforementioned problems, this utility model provides a testing device, comprising a test button, a reset test torsion spring, a contact piece, and a magnetic yoke. The reset test torsion spring includes a magnetic yoke contact portion, a button connection portion, a spring coil, a support portion, and a contact piece connection portion arranged sequentially. These components are connected sequentially and compactly, reducing the volume of the reset test torsion spring. The magnetic yoke contact portion is inclined, i.e., it has a bent portion. The cooperation between the reset test torsion spring and the contact piece increases the electrical clearance with the magnetic yoke, improving safety performance. The button connection portion is connected to the test button. The support portion cooperates with a support structure provided on the circuit breaker housing to fix and support the position of the reset test torsion spring. The contact piece connection portion is used to connect with the contact piece, and the contact piece connection portion and the contact piece are continuously connected. The contact piece is connected to the electronic component board through a test lead. When the test button is pressed, the button connection portion is subjected to force, causing the magnetic yoke contact portion to connect with the magnetic yoke, thus making the circuit of the testing device conductive.

[0005] According to one embodiment of the present invention, the test button and the button connection part are either fixed or movable. The fixed connection can be selected by means of bolts, clips, welding, or through holes.

[0006] Preferably, the test button and the button connecting part are movably connected, and the test button is provided with a mounting groove with one end open, and the button connecting part is located in the mounting groove.

[0007] According to one embodiment of the present invention, the support part is a U-shaped bending structure, which has high structural stability, facilitates better support effect, and is beneficial to improving the overall deformation stability and reset performance of the torsion spring during reset testing.

[0008] According to one embodiment of the present invention, the contact piece connecting part has an arc-shaped structure, which can produce a certain deformation after pressing the test button, thereby maintaining a better contact effect with the contact piece, and assisting the reset test torsion spring to quickly reset during reset.

[0009] According to one embodiment of the present invention, the magnetic yoke contact portion and the button connection portion have an included angle, forming a curved structure, which further improves the integration of the reset test torsion spring and reduces its volume.

[0010] According to one embodiment of the present invention, the included angle between the magnetic yoke contact portion and the button connection portion is ≤90°, preferably 90°.

[0011] According to one embodiment of the present invention, the inclination angle of the magnetic yoke contact portion is less than 90°, preferably 30~40°.

[0012] A residual current circuit breaker, comprising the aforementioned testing apparatus.

[0013] According to one embodiment of the present invention, a button limiting structure is provided in the residual current circuit breaker to limit the travel of the test button.

[0014] The beneficial effects of this utility model are that by adopting the design of irregular torsion spring and contact piece, the electrical clearance between the torsion spring and the magnetic yoke is improved, thus enhancing operational safety. Furthermore, the sequential connection and compact arrangement of the various parts of the reset test torsion spring effectively reduces its volume, simplifies assembly, improves production efficiency, and lowers production costs. In addition, the reset test torsion spring in this solution has good deformation stability, large torque, and good reset performance, which improves its service life, makes the test device stable and reliable in operation, and improves product quality. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the overall structure of a residual current circuit breaker;

[0017] Figure 2 This is a schematic diagram of the experimental setup;

[0018] Figure 3 This is a schematic diagram of the test button, reset test torsion spring, and contact plate.

[0019] Figure 4 for Figure 1 Enlarged schematic diagram of the torsion spring and contact plate during the reset test. Detailed Implementation

[0020] The following description is only intended to disclose the present invention so that those skilled in the art can implement it. The embodiments in the following description are merely examples, and those skilled in the art will conceive of other obvious modifications. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other solutions that do not depart from the spirit and scope of the present invention.

[0021] An experimental apparatus, such as Figure 1 It includes a test button 1, a reset test torsion spring 2, a contact piece 3, a magnetic yoke 4, a test lead 5, a trip coil assembly 6, an electronic component board 7, and a test resistor 71 mounted on the electronic component board 7.

[0022] The reset test torsion spring 2 includes a magnetic yoke contact part 21, a button connection part 22, a spring ring 24, a support part 25, and a contact piece connection part 23 arranged in sequence. The parts are connected in sequence and arranged compactly, which can effectively reduce the volume of the reset test torsion spring 2.

[0023] like Figure 2 , Figure 3 The magnetic yoke contact portion 21 is inclined, that is, it has a bent portion and is inclined to the side of the magnetic yoke 4 to increase the electrical clearance with the magnetic yoke 4 and improve safety performance. Specifically, the inclination angle A of the magnetic yoke contact portion 21 is less than 90°, preferably 30~40°.

[0024] The button connection part 22 is connected to the test button 1. The button connection part 22 has a straight structure, and there is an angle between the magnetic yoke contact part 21 and the button connection part 22, forming a curved structure, which further improves the integration of the reset test torsion spring 2 and reduces its size. Figure 3 The included angle between the magnetic yoke contact portion 21 and the button connection portion 22 is ≤90°, preferably 90°.

[0025] The test button 1 and the button connection part 22 are either fixed or movable. The fixed connection can be made by means of bolts, clips, welding, or through holes. In this embodiment, the test button 1 and the button connection part 22 are movable. The test button 1 is provided with a mounting groove 11 that is open at one end, and the button connection part 22 is located in the mounting groove 11.

[0026] When the test button 1 is pressed, the test button 1 applies pressure to the button connection part 22.

[0027] The support part 25 cooperates with the support structure 81 provided on the circuit breaker housing to fix and support the position of the reset test torsion spring 2, such as Figure 3 The support part 25 has a U-shaped bending structure, which has high structural stability and facilitates better support. This is beneficial for improving the overall deformation stability and reset performance of the torsion spring 2 during reset testing. Figure 4The support part 25 is held in the gap formed by the support structure 81.

[0028] The contact piece connecting part 23 is used to connect with the contact piece 3. The contact piece connecting part 23 and the contact piece 3 are continuously connected. The contact piece connecting part 23 has an arc-shaped structure, which can produce a certain deformation after pressing the test button 1, thereby maintaining a better contact effect with the contact piece 3, and assisting the reset test torsion spring 2 to quickly reset during reset.

[0029] The contact piece 3 is farther away from the magnetic yoke 4 than the magnetic yoke contact part 21. It is connected to the electronic component board 7 through the test lead 5. When the test button 1 is pressed, the button connection part 22 is subjected to force, which connects the magnetic yoke contact part 21 to the magnetic yoke 4, making the circuit of the test device conductive. The magnetic yoke contact part 21 can produce a certain deformation after contacting the magnetic yoke 4.

[0030] Under normal operating conditions, the magnetic yoke 4 is live, and the reset test torsion spring 2 and contact piece 4 are connected. When the test button 1 is pressed, the reset test torsion spring 2 contacts the magnetic yoke 4. At this time, the magnetic ring 9 detects the current imbalance and outputs an induction signal to the electronic component board 7. After processing and amplification, the electronic component board 7 provides a working voltage to the trip coil assembly 5.

[0031] A residual current circuit breaker, comprising the aforementioned testing apparatus.

[0032] like Figure 4 The residual current circuit breaker is equipped with a button limit structure 82, which is used to limit the travel of the test button 1 and control the extreme positions on both sides of the test button 1.

[0033] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations and modifications.

Claims

1. A test device, characterized by: The test button (1), the reset test torsion spring (2), the contact sheet (3) and the magnetic yoke (4) are included, the reset test torsion spring (2) includes the magnetic yoke contact part (21), the button connecting part (22), the spring ring (24), the support part (25) and the contact sheet connecting part (23) arranged in sequence, the magnetic yoke contact part (21) is arranged obliquely, the button connecting part (22) is connected with the test button (1), the support part (25) is matched with the support structure to realize the position fixation and support of the reset test torsion spring (2), the contact sheet connecting part (23) is used for being connected with the contact sheet (3), the contact sheet (3) is connected with the electronic component board (7), when the test button (1) is pressed, the button connecting part (22) is stressed, the magnetic yoke contact part (21) is connected with the magnetic yoke (4).

2. The test device of claim 1, wherein: The test button (1) and the button connecting part (22) are fixedly connected or movably connected.

3. The test device of claim 1, wherein: The test button (1) and the button connecting part (22) are movably connected, the test button (1) is provided with a mounting groove (11), and the button connecting part (22) is located in the mounting groove (11).

4. The test device of any one of claims 1-3, wherein: The support part (25) is a U-shaped bending structure.

5. The test device of claim 4, wherein: The contact sheet connecting part (23) is an arc-shaped structure.

6. The test device of claim 1 or 5, wherein: The magnetic yoke contact part (21) and the button connecting part (22) have an included angle, forming a curved structure.

7. The test device of claim 6, wherein: The included angle between the magnetic yoke contact part (21) and the button connecting part (22) is 90°.

8. The test device of claim 6, wherein: The inclination angle of the magnetic yoke contact part (21) is less than 90°.

9. An arc fault circuit interrupter, comprising: The test device of any one of claims 1-8 is included.

10. The ground fault circuit interrupter of claim 9, wherein: A button limiting structure (82) is arranged in the residual current circuit breaker.

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