Testing device of leakage protection circuit breaker

Abstract

The utility model provides a test device of a leakage protection circuit breaker, which is installed in a circuit breaker shell and comprises a test button and a power connection sheet, the power connection sheet is installed in the shell, a leakage protection unit in the leakage protection circuit breaker is connected with a power connection head, and the power connection head is connected with a power supply. The power connection head is electrically connected with a wiring terminal at one end of the leakage protection circuit breaker, an installation groove is formed in the shell, a fixing column is arranged in the installation groove and located below the test button, the fixing column is sleeved with a power connection torsion spring, a test resistor electrically connected with the power connection torsion spring is installed in the installation groove, and the test resistor is electrically connected with the power connection torsion spring. The other end of the test resistor is electrically connected with a wiring terminal at one end of the earth leakage protection circuit breaker, which is in butt joint with the electrical connector, one end of the electrical connection torsion spring is an abutting end which abuts against the test button in a matched manner, and the other end of the electrical connection torsion spring is a fixed end which is fixed in the housing and is electrically connected with the test resistor. The bottom end of the test button is provided with an extension plate which is abutted against the power connection torsion spring in an extending manner. The device is stable in structure and small in occupied space.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically to a test device for a residual current circuit breaker. Background Technology

[0002] Circuit breakers must be able to be connected in both directions. In particular, electromagnetic residual current circuit breakers (i.e., residual current circuit breakers that are independent of the power supply voltage) must have a test circuit that is not conductive when the product is open and conductive when the product is closed. Otherwise, when the reverse connection is made, the test resistor will burn out due to the test resistor circuit being energized for a long time when the test button is pressed for a long time.

[0003] A Chinese utility model patent with authorization announcement number CN210223918U discloses a residual current circuit breaker (RCCB) capable of reversible wiring. The RCCB includes a first housing, within which a first circuit breaker unit is housed. The first circuit breaker unit includes a first moving contact, a first stationary contact, a first arc-extinguishing chamber, a first handle operating mechanism, and a first trip unit. The first housing also includes a test circuit and a power supply device for the residual current circuit board. The test circuit and the power supply device for the residual current circuit board include a button, a first conductive coil, a second conductive coil, a first power-taking torsion spring, and a second power-taking torsion spring. The first and second conductive coils are respectively mounted on a first mounting post and a second mounting post of the first housing. The first power-taking torsion spring is sleeved on a third mounting post of the first housing. The first extension arm of the first power-taking torsion spring contacts the second conductive coil to achieve electrical connection. The second extension arm of the first power-taking torsion spring is located below the button and corresponds to the first conductive coil. Pressing down the button will cause the second extension arm of the first power-taking torsion spring to contact the first conductive coil to achieve electrical connection. The second power-taking torsion spring is located on the fourth mounting post of the first housing. The first extension arm of the second power-taking torsion spring is electrically connected to the first moving contact. A lever is provided on the moving contact mounting seat of the first handle operating mechanism. The lever is corresponding to the second extension arm of the second power-taking torsion spring. When the circuit breaker is closed, the second extension arm of the second power-taking torsion spring contacts the second conductive coil to achieve electrical connection. When the circuit breaker is open, the lever drives the second extension arm of the second power-taking torsion spring to rotate, thereby separating the second extension arm from the second conductive coil.

[0004] When the circuit breaker is closed, the second extension arm of the second power-taking torsion spring contacts the second conductive coil to achieve electrical connection. Pressing the button allows power to be drawn from the movable contact to the first conductive coil to test the circuit breaker. When the circuit breaker is open, the lever drives the second extension arm of the second power-taking torsion spring to rotate, causing the second extension arm to separate from the second conductive coil. Pressing the button ensures that the test circuit is always de-energized, and any positive or negative connection is very safe.

[0005] However, the circuit breaker mentioned above has a complex power supply structure. The two torsion springs need to be connected through a conductive coil to achieve circuit conduction. Moreover, the torsion spring installation structure is not stable enough, which makes it easy for the torsion springs to detach when they move, causing the circuit to break. Utility Model Content

[0006] Based on the above problems, the purpose of this utility model is to provide a test device with a stable structure and small space occupation.

[0007] To address the above problems, the following technical solution is provided: A testing device for a residual current circuit breaker (RCCB), installed inside the RCCB housing, includes a test button and a contact piece. The RCCB housing has a through-hole that slides to engage with the test button. The contact piece is installed inside the housing. A contact head is connected to the residual current protection unit within the RCCB, and the contact head is electrically connected to one terminal of the RCCB. A mounting groove is provided inside the housing, and a fixing post is located below the test button within the mounting groove. A torsion spring is fitted onto the fixed column. A test resistor electrically connected to the torsion spring is installed in the mounting groove. The other end of the test resistor is electrically connected to the terminal of the contact head of the leakage current circuit breaker. One end of the torsion spring is a contact end that abuts against the test button, and the other end is a fixed end that is fixed in the housing and electrically connected to the test resistor. An extension plate is provided at the bottom of the test button to abut against the torsion spring. The contact end swings relative to the central axis of the fixed column when the test button is pressed until it abuts against the contact plate, thereby connecting the test circuit.

[0008] In the above structure, when the circuit breaker is closed, the contact head abuts against the contact piece to establish an electrical connection. Pressing the test button displaces the contact end to abut against the contact piece, thus testing the circuit breaker. When the circuit breaker is open, the contact head separates from the contact piece. Therefore, pressing the button ensures the test circuit remains de-energized, making it very safe and reliable, regardless of whether the moving contact is energized. The mounting slot facilitates the installation of the extension plate, the contact torsion spring, and the test resistor, resulting in a more compact structure and reduced space occupation. The extension plate facilitates the engagement of the test button and the contact torsion spring, improving the engagement strength and thus enhancing the reliability and stability of the device. The fixing post facilitates the installation of the contact torsion spring and improves its stability, further enhancing the reliability of the device.

[0009] The present invention is further provided that the mounting groove is provided with a fixing ridge above the abutting end for abutting and limiting the positioning.

[0010] In the above structure, the fixed ridge can limit the contact end, which in turn can limit the electric torsion spring, improving the feel of the test button when pressed and facilitating the reset of the test button when the electric torsion spring releases torque, thus improving the comfort and reliability of the operation of this utility model.

[0011] The present invention is further provided that the mounting groove is provided with a clearance groove for installing the test resistor.

[0012] In the above structure, the placement groove facilitates the positioning and installation of the test resistor, thereby saving space, improving the compactness of the structure, and enhancing the stability of the present invention.

[0013] The present invention is further configured such that a limiting block is provided in the mounting groove, and two sets of limiting blocks are provided, which are respectively located on opposite sides of the two ends of the relief groove. The limiting block near the end of the power-connecting torsion spring is connected to the fixing edge and abuts against the fixing end.

[0014] In the above structure, the setting of the limiting block facilitates the positioning and installation of the test resistor and limits its movement, thereby improving the stability of the test resistor and thus enhancing the reliability of this invention. Furthermore, by setting the limiting block to abut against the fixed end, the stability of the electrical torsion spring is further improved, thus enhancing the reliability of this invention.

[0015] The present invention is further configured such that a limiting edge is provided in the mounting groove opposite to the fixed edge, and a sliding groove is formed between the fixed edge and the limiting edge to slide and cooperate with the extension plate.

[0016] The above structure improves the stability of the extension plate during displacement, thereby enhancing the reliability of the test button during pressing and increasing the structural strength of this invention.

[0017] The present invention is further configured such that the bottom end of the test button is provided with a retaining edge that limits and cooperates with the through opening, and the extension plate is located at one end of the retaining edge.

[0018] In the above structure, the test button can be prevented from coming out of the through-hole by setting a retaining edge, thereby improving the stability of the test button.

[0019] The present invention is further provided that the bottom end of the extension plate has a slot that matches the abutment end.

[0020] In the above structure, the slot can further limit the contact end of the electric torsion spring, prevent it from shaking, improve the stability of the electric torsion spring, and thus improve the reliability of the electric connection of this utility model.

[0021] The present invention is further provided that the mounting groove is provided with a cover that is adapted to it.

[0022] By adopting the above structure, the test device can be further limited, thereby further improving the stability of this utility model.

[0023] The present invention is further configured such that a fixing seat is snapped into the housing, and a fitting groove for installing a contact piece is provided on the outer edge of the fixing seat. One end of the contact piece protrudes from the fitting groove, and the other end protrudes from the fixing seat into the mounting groove. A swinging port for the contact head to swing is provided on the fixing seat.

[0024] By adopting the above structure, the space inside the shell can be reasonably arranged, making the structure of this utility model compact. Furthermore, by setting the fitting groove, the positioning and installation of the contact piece can be facilitated, improving the firmness of the contact piece after installation and thus enhancing the reliability of this utility model. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the test button installed on the housing in this utility model.

[0026] Figure 2 This is a schematic diagram of the structure of the present invention located inside the housing. Figure One .

[0027] Figure 3 This is a schematic diagram of the structure of the present invention located inside the housing. Figure Two .

[0028] Figure 4 This is a schematic diagram of the shell structure in this utility model.

[0029] Figure 5 This is a schematic diagram of the test button in this utility model. Figure One .

[0030] Figure 6 This is a schematic diagram of the test button in this utility model. Figure Two .

[0031] Figure 7 This is a schematic diagram of the structure of the cap in this utility model.

[0032] Figure 8 This is a schematic diagram of the structure of the fixed base in this utility model.

[0033] The labels in the diagram have the following meanings: 1-Housing; 2-Test button; 3-Electrifying piece; 11-Through opening; 4-Electrifying head; 12-Mounting groove; 13-Fixing post; 5-Electrifying torsion spring; 6-Test resistor; 51-Abutting end; 52-Fixing end; 21-Extension plate; 14-Fixing ridge; 121-Leaning groove; 15-Limiting block; 16-Limiting ridge; 17-Slide groove; 22-Side guard; 23-Card slot; 7-Cap; 8-Fixing base; 81-Matching groove; 82-Swing opening. Detailed Implementation

[0034] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0035] It should be noted that all directional indicators (such as up, down, left, right, front, back, back, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0036] like Figures 1 to 8 The diagram shows a test device for a residual current circuit breaker (RCCB), installed inside the RCCB housing 1. It includes a test button 2 and a contact piece 3. The housing 1 has a through-hole 11 that slides with the test button 2. The contact piece 3 is installed inside the housing 1. A contact 4 is connected to the residual current protection unit of the RCCB, and the contact 4 is electrically connected to one of the terminals of the RCCB. A mounting groove 12 is provided inside the housing 1, and a fixing post 13 is located below the test button 2 within the mounting groove 12. A contact button is sleeved on the fixing post 13. Spring 5, test resistor 6 is installed in the mounting groove 12 and is electrically connected to the power-connecting torsion spring 5. The other end of the test resistor 6 is electrically connected to the terminal of the power connector 4 of the leakage current protection circuit breaker. One end of the power-connecting torsion spring 5 is a contact end 51 that abuts against the test button 2, and the other end is a fixed end 52 that is fixed in the housing 1 and electrically connected to the test resistor 6. The bottom end of the test button 2 extends with an extension plate 21 that abuts against the power-connecting torsion spring 5. The contact end 51 swings relative to the central axis of the fixed column 13 when the test button 2 is pressed until it abuts against the power-connecting piece 3, thereby realizing the power connection of the test circuit.

[0037] In the above structure, when the circuit breaker is closed, the contact head 4 abuts against the contact piece 3 to achieve electrical connection. Pressing the test button 2 causes the contact end 51 to move to abut against the contact piece 3, thus enabling the circuit breaker to be tested. When the circuit breaker is open, the contact head 4 separates from the contact piece 3. Therefore, pressing the button ensures that the test circuit is always de-energized, making it very safe and reliable, regardless of whether the moving contact is energized. The mounting slot 12 facilitates the installation of the extension plate 21, the contact torsion spring 5, and the test resistor, resulting in a more compact structure and reduced space occupation. The extension plate 21 facilitates the cooperation between the test button 2 and the contact torsion spring 5, improving the cooperation strength and thus enhancing the reliability and stability of the device. The fixing post 13 facilitates the installation of the contact torsion spring 5 and improves its stability, further enhancing the reliability of the device.

[0038] In this embodiment, a fixing ridge 14 is provided in the mounting groove 12 above the abutting end 51 to abut and limit its movement.

[0039] In the above structure, the fixed ridge 14 can limit the contact end 51, and thus limit the electric torsion spring 5, which improves the feel of the test button 2 when pressed, and makes it easier for the test button 2 to reset when the electric torsion spring 5 releases torque, thus improving the comfort and reliability of the operation of this utility model.

[0040] In this embodiment, a clearance groove 121 for installing the test resistor 6 is provided in the mounting groove 12.

[0041] In the above structure, the placement groove 121 facilitates the positioning and installation of the test resistor 6, thereby saving space, improving the compactness of the structure, and enhancing the stability of the present invention.

[0042] In this embodiment, the mounting groove 12 is provided with a limiting block 15. There are two sets of limiting blocks 15, which are located on opposite sides of the two ends of the clearance groove 121. The limiting block 15 near the end of the electric torsion spring 5 is connected to the fixing ridge 14 and abuts against the fixing end 52.

[0043] In the above structure, the limiting block 15 facilitates the positioning and installation of the test resistor 6 and limits its movement, thereby improving the stability of the test resistor 6 and thus enhancing the reliability of this invention. Furthermore, by having the limiting block 15 abut against the fixed end 52, the stability of the power-connecting torsion spring 5 is further improved, thus enhancing the reliability of this invention.

[0044] In this embodiment, the mounting groove 12 is provided with a limiting edge 16 that is opposite to the fixing edge 14, and a sliding groove 17 is formed between the fixing edge 14 and the limiting edge 16 to slide and cooperate with the extension plate 21.

[0045] The above structure can improve the stability of the extension plate 21 when it is displaced, thereby improving the reliability of the test button 2 when it is pressed and improving the structural strength of this utility model.

[0046] In this embodiment, the bottom of the test button 2 is provided with a retaining edge 22 that is matched with the through opening 11, and the extension plate 21 is located at one end of the retaining edge 22.

[0047] In the above structure, by setting the retaining edge 22, the test button 2 can be prevented from coming out of the through opening 11, thereby improving the stability of the test button 2.

[0048] In this embodiment, the bottom end of the extension plate 21 is provided with a slot 23 that cooperates with the abutment end 51.

[0049] In the above structure, by setting the slot 23, the contact end 51 of the electric torsion spring 5 can be further limited to prevent it from shaking, thereby improving the stability of the electric torsion spring 5 and thus improving the reliability of the electric connection of this utility model.

[0050] In this embodiment, the mounting groove 12 is provided with a cover 7 that is adapted to it.

[0051] By adopting the above structure, the test device can be further limited, thereby further improving the stability of this utility model.

[0052] In this embodiment, a fixing seat 8 is snapped into the housing 1. The outer edge of the fixing seat 8 is provided with a fitting groove 81 for installing the contact piece 3. One end of the contact piece 3 protrudes from the fitting groove 81, and the other end protrudes from the fixing seat 8 into the mounting groove 12. The fixing seat 8 is provided with a swinging port 82 for the contact head 4 to swing.

[0053] By adopting the above structure, the space inside the housing 1 can be reasonably arranged, making the structure of this utility model compact. Furthermore, by setting the fitting groove 81, the positioning and installation of the electrical contact piece 3 can be facilitated, improving the firmness of the electrical contact piece 3 after installation, thereby improving the reliability of this utility model.

[0054] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model. These improvements and modifications assumed above should also be considered within the protection scope of the present utility model.

Claims

1. A testing device for a residual current circuit breaker, installed inside the housing of the residual current circuit breaker, comprising a test button and a contact plate, wherein the housing has a through opening for sliding engagement with the test button, and the contact plate is installed inside the housing, characterized in that: The residual current circuit breaker has a contact head connected to the residual current protection unit. The contact head is electrically connected to one of the terminals of the residual current circuit breaker. The housing has a mounting groove, and a fixing post is located below the test button in the mounting groove. A torsion spring is sleeved on the fixing post. A test resistor electrically connected to the torsion spring is installed in the mounting groove. The other end of the test resistor is electrically connected to the terminal of the residual current circuit breaker opposite to the contact head. One end of the torsion spring is a contact end that abuts against the test button, and the other end is a fixing end that is fixed in the housing and electrically connected to the test resistor. An extension plate extends from the bottom of the test button to abut against the torsion spring. The contact end swings relative to the central axis of the fixing post when the test button is pressed until it abuts against the contact plate, thus connecting the test circuit.

2. The test apparatus for a residual current circuit breaker according to claim 1, characterized in that: The mounting groove is provided with a fixing ridge above the abutting end for abutting and limiting its movement.

3. The test apparatus for a residual current circuit breaker according to claim 2, characterized in that: The mounting slot is provided with a clearance slot for installing the test resistor.

4. The test apparatus for a residual current circuit breaker according to claim 3, characterized in that: The mounting groove is provided with a limiting block. There are two sets of limiting blocks, which are located on opposite sides of the two ends of the clearance groove. The limiting block near the end of the electric torsion spring is connected to the fixing edge and abuts against the fixing end.

5. The test apparatus for a residual current circuit breaker according to claim 2, characterized in that: The mounting groove is provided with a limiting edge that is opposite to the fixed edge, and a sliding groove is formed between the fixed edge and the limiting edge to slide and cooperate with the extension plate.

6. The test apparatus for a residual current circuit breaker according to claim 5, characterized in that: The bottom of the test button is provided with a retaining edge that limits the movement of the through opening, and the extension plate is located at one end of the retaining edge.

7. The test apparatus for a residual current circuit breaker according to claim 6, characterized in that: The bottom end of the extension plate has a slot that matches the abutment end.

8. The test apparatus for a residual current circuit breaker according to claim 1, characterized in that: The mounting slot is equipped with a matching cover.

9. The test apparatus for a residual current circuit breaker according to claim 1, characterized in that: The housing is fitted with a fixing seat. The outer edge of the fixing seat is provided with a fitting groove for installing the contact piece. One end of the contact piece protrudes from the fitting groove, and the other end protrudes from the fixing seat into the mounting groove. The fixing seat is provided with a swing port for the contact head to swing.

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