Electric leakage test structure of circuit breaker
By using a test button design with a cam lever structure in the leakage circuit breaker, the problem of large space, high cost and easy dust intake in the test button structure in the prior art is solved, and the effect of small strokes and large electrical gaps is achieved, and the operation reliability and safety are improved.
Patent Information
- Application Number
- CN202421527485.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-06-28
AI Technical Summary
The test button structure of existing leakage circuit breakers requires a large electrical clearance distance, resulting in large space occupation, high production costs, and easy dust failure.
The cam lever structure is adopted, and the left lever arm is touched through the lower action of the test button, and the right lever arm is moved through the fulcrum cam, and the linkage phase extreme-moving contact shrapnel is raised upward to contact the circuit board contact body, realizing the test button structure design with small stroke and large electrical gap.
The test button structure with small strokes and large electrical clearance is realized, ensuring that the internal contact sheet space is large enough, meeting the dielectric test requirements of creepage distance, improving user operation reliability and safety, and giving more flexibility and abundant internal design space for the product.
Smart Images
Figure CN222762901U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of products of miniature leakage protection circuit breakers for household and similar purposes, in particular to a leakage test structure of the circuit breaker. Background Art
[0002] A residual current circuit breaker is an electrical safety device that can quickly cut off the power supply in case of leakage to prevent electric shock accidents. The residual current circuit breaker includes a leakage test structure. The installation and use specification GB13955 clearly stipulates that the leakage test structure of the residual current circuit breaker must be pressed once a month to determine whether the residual current protection device of the residual current circuit breaker can work normally.
[0003] The leakage test structure generally includes a test button, a compression spring that provides a reset bias force for the test button, a moving spring located below the test button, and a static spring opposite to the moving spring. The moving spring and the static spring are electrically connected to the circuit board through wires. During the leakage test, the test button is manually pressed, and the test button will contact the moving spring below it and push the moving spring downward until its active end contacts the static spring, so that the test circuit is turned on. At this time, the leakage releaser is activated to drive the circuit breaker to open. After the test is completed, the pressure on the test button is removed, and the test button will reset under the action of the compression spring. The test button structure of similar low-voltage electrical products on the market is that the test button directly presses the contact spring to contact the phase pole for conduction. The travel of the test button is at least the same as the electrical clearance distance required by the contact spring, which takes up space design and causes a waste of production costs. Moreover, the test button hole is usually directly opposite to the contact conduction point, which is easy to get dust and fail. Utility Model Content
[0004] In view of the above technical problems, the utility model solves the problem that the stroke of the test button and the electrical clearance distance required by the contact spring are at least the same, thereby providing a leakage test structure for a circuit breaker with a smaller operating stroke of the test button and a larger electrical clearance distance required by the contact piece.
[0005] In order to solve the above technical problems, the technical solution provided by the utility model is: a leakage test structure of a circuit breaker, comprising a circuit breaker housing, in which a cam lever, a phase pole moving contact spring, a circuit board contact body and an electromagnetic frame and a test button penetrating the housing are arranged; the cam lever comprises a fulcrum cam in the central part and a left lever arm and a right lever arm on the left and right sides of the fulcrum cam, the left lever arm is linked with the bottom end of the test button, and the right lever arm supports the phase pole moving contact spring; one end of the phase pole moving contact spring is clamped in the housing and electrically contacts the electromagnetic frame, and the other end contacts or disconnects with the circuit board contact body; when the test button moves downward, it touches the left lever arm, and the right lever arm is tilted through the fulcrum cam, so that the phase pole moving contact spring is tilted upward to contact with the circuit board contact body to form a leakage test circuit.
[0006] Further: In the leakage test structure of the circuit breaker, the test button includes a button head exposed from the housing and used for pressing, and a button body hidden in the housing and used as a force-applying part, the bottom end of the button body is wedge-shaped; a bayonet is provided on one side of the button body, and an outward-tilted sliding page is provided on the other side for easy sliding down. A guide column matching the bayonet is provided on the side of the housing.
[0007] The circuit board contact body comprises a circuit board, an electronic wire and a contact sheet which is connected in sequence and contacts or disconnects with a phase-polar dynamic contact spring sheet.
[0008] The phase-acting movable spring piece is in the shape of a number 2 tilted to the left as a whole, and includes an arched contact portion whose top end contacts or disconnects with the contact piece and a fixed portion whose bottom end electrically contacts the electromagnetic frame, and a support arm that is in sliding contact with the right lever arm is provided between the contact portion and the fixed portion. The longitudinal section of the fixed portion is in the shape of a semi-paper needle. The cam lever is in the shape of an inverted seesaw as a whole, and the left lever arm and the right lever arm at both ends of the cam are in a staggered angle of 120 to 150 degrees, and the preferred angle is 150 degrees.
[0009] Compared with the prior art, the leakage test structure of the circuit breaker includes a circuit breaker housing, a cam lever, a phase pole moving spring sheet, a circuit board contact body and an electromagnetic frame, and a test button that penetrates the housing. The cam lever includes a fulcrum cam in the center and a left lever arm and a right lever arm on the left and right sides of the fulcrum cam. The left lever arm is linked with the bottom end of the test button, and the right lever arm supports the phase pole moving spring sheet. One end of the phase pole moving spring sheet is clamped in the housing and electrically contacts the electromagnetic frame, and the other end is in contact with or disconnected from the circuit board contact body. When the test button moves downward, it touches the left lever arm, and the right lever arm is tilted through the fulcrum cam, which links the phase pole moving spring sheet to tilt upward and contact the circuit board contact body to form a leakage test circuit. The test button of the utility model does not directly contact the phase pole moving spring sheet, but realizes the test button structure design with a small stroke and a large electrical gap through the seesaw effect of the cam lever. This design ensures that the internal contact space is large enough, and the dielectric test requirement for creepage distance is above 6KV. The small button stroke makes the user operation more reliable, sensitive and safe, and gives the product internal design space more flexibility. In addition, the contact point is under the protection of the cover, not directly facing the button window, which is dust-proof, safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a circuit breaker of an implementation mode, wherein A is to remove the surface shell corresponding to the leakage test structure of the circuit breaker to expose the leakage test structure area (the test button is in a natural state);
[0011] Figure 2 for Figure 1A schematic diagram of the enlarged structure of the leakage test structure of the circuit breaker of part A (the test button is in the natural state);
[0012] Figure 3 for Figure 1 The leakage test structure of the circuit breaker of part A, when the test button is pressed, the phase pole moving contact spring is tilted upward and contacts the circuit board contact body to form an enlarged structural diagram of the leakage test circuit;
[0013] Figure 4 It is an enlarged structural diagram of the cam lever structure;
[0014] Figure 5 This is a simplified diagram of the enlarged structure of the test button;
[0015] Figure 6 It is a simplified diagram of the enlarged structure of the circuit board contact body;
[0016] Figure 7 It is a simplified diagram of the enlarged structure of the phase-actuated dynamic spring;
[0017] Among them, 1 is a shell, 2 is a cam lever, 3 is a phase pole dynamic contact spring, 4 is a circuit board contact body, 5 is an electromagnetic frame, 6 is a test button, 7 is a fulcrum cam, 8 is a left lever arm, 9 is a right lever arm, 10 is a button head, 11 is a button body, 12 is a bayonet, 13 is an outward-tilted slide, 14 is a guide column, 15 is a circuit board, 16 is an electronic wire, 17 is a contact piece, 18 is a contact part, 19 is a fixing part, and 20 is a support arm. DETAILED DESCRIPTION
[0018] In order to facilitate understanding by those skilled in the art, the present invention will be further described in detail below with reference to the accompanying drawings and implementation modes.
[0019] A leakage test structure of a circuit breaker comprises a circuit breaker housing 1, in which a cam lever 2, a phase pole movable contact spring piece 3, a circuit board contact body 4 and an electromagnetic frame 5 as well as a test button 6 penetrating the housing are arranged; the cam lever 2 comprises a fulcrum cam 7 at the center part and a left lever arm 8 and a right lever arm 9 at the left and right sides of the fulcrum cam, the left lever arm 8 is linked with the bottom end of the test button 6, and the right lever arm 9 supports the phase pole movable contact spring piece 3; one end of the phase pole movable contact spring piece 3 is clamped in the housing and electrically contacts the electromagnetic frame 5, and the other end contacts or disconnects with the circuit board contact body 4; when the test button moves downward, the left lever arm 8 is touched, and the right lever arm 9 is tilted through the fulcrum cam 7, so that the phase pole movable contact spring piece 3 is linked to tilt upward and contact the circuit board contact body 4 to form a leakage test circuit. The test button includes a button head 10 exposed from the housing and used for pressing, and a button body 11 hidden in the housing and used as a force-applying part, the bottom end of the button body is wedge-shaped; a bayonet 12 is provided on one side of the button body, and an outward-tilted sliding page 13 is provided on the other side for easy sliding down. A guide column 14 matching the bayonet is provided on the side of the housing. The circuit board contact body includes a circuit board 15, an electronic wire 16 and a contact piece 17 that contacts or disconnects with the phase-pole dynamic contact spring piece connected in sequence. The phase-pole dynamic contact spring piece is in the shape of a number 2 tilted to the left as a whole, and includes an arched contact part 18 that contacts or disconnects with the contact piece 17 at the top and a fixed part 19 that electrically contacts the electromagnetic frame 5 at the bottom, and a support arm 20 that contacts the lever arm of the cam lever in sliding contact is provided between the contact part and the fixed part. The longitudinal section of the fixed part 19 is in the shape of a semi-paper needle. The cam lever is in the shape of an inverted seesaw as a whole, and the left lever arm 8 and the right lever arm form an angle of 150 degrees.
[0020] The test button of this embodiment does not directly contact the phase pole moving spring 3, but through the seesaw effect of the cam lever, a test button structure design with a small stroke and a large electrical gap is realized. This design ensures that the internal electrical contact piece space is large enough, and its creepage distance (such as Figure 2 The dielectric test requirement of the D spacing is 6KV or above. The small button stroke makes the user operation more reliable, sensitive and safe, and makes the internal design space of the product more flexible and sufficient. In addition, the contact point is under the protection of the cover, not directly facing the button window, which is dust-proof and safe.
[0021] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.
Claims
1. A leakage test structure for a circuit breaker, comprising a circuit breaker housing (1), characterized in that: A cam lever (2), a phase-pole movable contact spring (3), a circuit board contact body (4), an electromagnetic frame (5), and a test button (6) penetrating the shell are arranged in the shell; The cam lever (2) comprises a fulcrum cam (7) at the center and a left lever arm (8) and a right lever arm (9) at the left and right sides of the fulcrum cam, wherein the left lever arm (8) is linked to the bottom end of the test button (6), and the right lever arm (9) supports the corresponding movable spring sheet (3); One end of the phase-pole movable contact spring (3) is clamped in the housing and electrically contacts the electromagnetic frame (5), and the other end is in contact with or disconnected from the circuit board contact body (4); When the test button moves downward, the left lever arm (8) is touched, and the right lever arm (9) is tilted through the fulcrum cam (7), so that the phase-acting movable spring sheet (3) is tilted upward to contact with the circuit board contact body (4) to form a leakage test circuit.
2. The leakage test structure of the circuit breaker according to claim 1, characterized in that: The test button comprises a button head (10) exposed from a housing and used for pressing, and a button body (11) hidden in the housing and serving as a force-applying part, wherein the bottom end of the button body is wedge-shaped; a bayonet (12) is provided on one side of the button body, and an outward-tilted sliding page (13) is provided on the other side for easy sliding down.
3. The leakage test structure of the circuit breaker according to claim 2, characterized in that: A guide post (14) matched with the bayonet is arranged on the side of the housing.
4. The leakage test structure of the circuit breaker according to claim 3, characterized in that: The circuit board contact body comprises a circuit board (15), an electronic wire (16) and a contact piece (17) which are connected in sequence and contact or disconnect with a phase-polar dynamic contact spring piece.
5. The leakage test structure of the circuit breaker according to claim 4, characterized in that: The phase-actuated movable spring piece is in the shape of a number 2 tilted to the left as a whole, and comprises an arched contact portion (18) whose top end contacts or disconnects from the contact piece (17) and a fixed portion (19) whose bottom end is in electrical contact with the electromagnetic frame (5), and a support arm (20) is provided between the contact portion and the fixed portion, which is in sliding contact with the right lever arm.
6. The leakage test structure of the circuit breaker according to claim 5, characterized in that: The cross section of the fixing portion (19) is in the shape of a semi-circular needle.
7. The leakage test structure of a circuit breaker according to any one of claims 1 to 6, characterized in that: The cam lever is in an inverted seesaw shape as a whole, and the left lever arm and the right lever arm form an angle of 120 to 150 degrees.
8. The leakage test structure of the circuit breaker according to claim 7, characterized in that: The left lever arm and the right lever arm form an angle of 150 degrees.