Circuit breaker with high safety
By designing limit torsion springs and contact springs in the circuit breaker, ensuring that the moving contacts are disconnected from the test circuit in the open state, the problem of the moving contacts still being energized in the open state of the existing circuit breaker, and improving safety and reliability.
Patent Information
- Application Number
- CN202421793271.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-07-26
AI Technical Summary
In the open state of the existing leakage protection circuit breaker, the moving contact is still in a state connected to the test circuit, which is prone to be in a state of being charged, resulting in the circuit breaker being easily damaged when the test button is pressed, and the safety is low.
A circuit breaker is designed including a housing, a housing cover, a short-circuit protection device, an arc extinguishing device, an overload protection device, a leakage protection device, a test device, a contact assembly and an operating device. In the open state, through the design of the limit torsion spring and contact spring, the moving contact is ensured to be disconnected from the test circuit and avoid the live state.
In the open state, the circuit breaker cannot generate a circuit, which improves safety and reliability and avoids the problem of damage to the circuit breaker during testing.
Smart Images
Figure CN222826334U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of circuit breakers, in particular to a circuit breaker with high safety. Background Art
[0002] The leakage protection circuit breaker has overload, short circuit and leakage protection functions, that is, it has the functions of a circuit breaker and a leakage protector. Therefore, the leakage protection circuit breaker is a commonly used protection device in electrical circuits, and is widely used in mobile electrical equipment and handheld power tools; electrical equipment installed in humid, highly corrosive and other harsh places; electrical construction machinery and equipment at construction sites; socket circuits in buildings such as schools, enterprises, and residences; underwater lighting equipment in swimming pools, fountains, and baths; power supply lines and equipment installed in water; electrical medical equipment in hospitals that directly contact the human body, etc.
[0003] In the existing leakage protection circuit breaker, the moving contact is still connected to the test circuit in the open state, and is easily in a live state. When the test button is pressed, the circuit breaker is easily damaged, and the safety is low. Utility Model Content
[0004] Based on the above problems, the purpose of the utility model is to provide a circuit breaker with high safety in which the test circuit is in a disconnected state in the open state.
[0005] In view of the above problems, the following technical solutions are provided: a circuit breaker with high safety, comprising a shell, a shell cover, a short-circuit protection device, an arc extinguishing device, an overload protection device, a leakage protection device, a test device, a contact assembly and an operating device for controlling the contact assembly to open or close the switch, wherein the contact assembly comprises a moving contact and a static contact, the side of the leakage protection device facing the shell cover is provided with a cover plate connected and fixed to the shell, two moving contacts are provided, and both of the two moving contacts are provided with a limit torsion spring for limiting the moving contacts, and one of the limit torsion springs facing the shell cover is provided with a limit torsion spring for limiting the moving contacts. An extension section is provided at the end extending toward the cover plate, the test device includes a test button, a button spring located below the test button, a contact spring located on the cover plate and a button sheet located on one side of the contact spring, the cover plate is provided with a first connecting column for sleeve connection of the button spring and a second connecting column for sleeve connection of the contact spring, one end of the button spring abuts against the bottom of the test button, and abuts against the button sheet when the test button is pressed, and the other end is connected to one end of the contact spring, the other end of the contact spring is located at the lower side of the extension section, the moving contact and the static contact are in the closed state, and the extension section abuts against the contact spring.
[0006] In the above structure, a connecting wire is connected to the wiring terminal on the same side of the circuit breaker housing and the test button, and the other end of the connecting wire is connected to a test resistor electrically connected to the button sheet. In the closed state, the extension section of one end of the limit torsion spring abuts against the contact spring, and the test button is pressed, and the button spring abuts against the button sheet, thereby generating leakage, the leakage protection device is activated, the utility model is opened, and the operating device is reset; in the open state, the extension section of the limit torsion spring does not abut against the contact spring, and after the test button is pressed, a circuit cannot be generated, thereby improving the safety and reliability of the utility model. In the existing leakage protection circuit breaker, in the open state, its moving contact is still in a state of being connected to the test circuit, and is easily in a charged state. When the test button is pressed, the circuit breaker is easily damaged. Therefore, in the open state, the limit torsion spring of the utility model does not abut against the contact spring, does not carry current, and cannot generate a circuit, thereby compared with the existing leakage protection circuit breaker, the utility model is safer. The first connecting column can be provided to facilitate the positioning and installation of the button spring, and the second connecting column can be provided to facilitate the positioning and installation of the contact spring, thereby improving the convenience of assembly of the utility model.
[0007] The utility model is further configured that a partition is provided on the cover plate between the button spring and the extension section.
[0008] By adopting the above structure, the creepage distance between the two can be increased, thereby improving the reliability of the utility model.
[0009] The utility model is further configured that the cover plate is provided with a limiting groove for installing the contact spring.
[0010] The above structure can facilitate the installation of the contact spring and can limit the contact spring, thereby improving the convenience of assembly of the utility model.
[0011] The utility model is further configured that a clamping groove for clamping the button sheet is provided on one side of the cover plate located at the limiting groove.
[0012] The above structure can facilitate the positioning and installation of the button sheet, thereby improving the convenience of assembly of the utility model.
[0013] The utility model is further configured that a mounting groove for accommodating the end of the button spring is provided at the bottom of the test button, and an inverted arc is provided at one end of the mounting groove abutting against the button spring.
[0014] By adopting the above structure, one end of the button spring can be limited, and the test button and the button spring can be easily matched and abutted, thereby improving the reliability of the utility model.
[0015] The utility model is further configured that a clearance opening is provided on one side of the installation groove toward the cover plate, and a stop block is provided on the cover plate at a position corresponding to the clearance opening.
[0016] In the above structure, the stop block cooperates with the clearance opening, so as to improve the stability of the displacement of the test button, thereby improving the reliability of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural schematic diagram of the utility model.
[0018] Figure 2 It is a schematic diagram of the internal structure of the utility model.
[0019] Figure 3 for Figure 2 A magnified view of the structure at center.
[0020] Figure 4 It is a structural schematic diagram of a test device of the utility model.
[0021] Meaning of the numbers in the figure: 1-shell; 2-shell cover; 3-short-circuit protection device; 4-arc extinguishing device; 5-overload protection device; 6-leakage protection device; 7-test device; 8-operating device; 81-moving contact; 82-static contact; 9-cover plate; 01-limiting torsion spring; 011-extension section; 71-test button; 72-button spring; 73-contact spring; 74-button sheet; 91-first connecting column; 92-second connecting column; 93-partition; 94-limiting groove; 95-clamping groove; 711-installation groove; 712-allowance opening; 96-stop block. DETAILED DESCRIPTION
[0022] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0023] It should be noted that all directional indications (such as up, down, left, right, front, back, backside...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0024] like Figures 1 to 4A circuit breaker with high safety is shown, comprising a housing 1, a housing cover 2, a short-circuit protection device 3 located in the housing 1, an arc extinguishing device 4, an overload protection device 5, a leakage protection device 6, a test device 7, a contact assembly and an operating device 8 for controlling the contact assembly to open or close the switch, wherein the contact assembly comprises a moving contact 81 and a stationary contact 82, the leakage protection device 6 is provided with a cover plate 9 connected and fixed to the housing 1 on the side facing the housing cover 2, the moving contacts 81 are provided with two, and both of the moving contacts 81 are provided with a limiting torsion spring 01 for limiting the moving contacts 81, and one end of the limiting torsion spring 01 facing the side of the housing cover 2 is extended toward the cover plate 9 and provided with an extension section 011, The test device 7 includes a test button 71, a button spring 72 located below the test button 71, a contact spring 73 located on the cover plate 9, and a button sheet 74 located on one side of the contact spring 73. The cover plate 9 is provided with a first connecting column 91 for the button spring 72 to be sleeved and a second connecting column 92 for the contact spring 73 to be sleeved. One end of the button spring 72 abuts against the bottom of the test button 71, and abuts against the button sheet 74 when the test button 71 is pressed, and the other end is connected to one end of the contact spring 73. The other end of the contact spring 73 is located at the lower side of the extension section 011. When the moving contact 81 and the static contact 82 are in the closed state, the extension section 011 abuts against the contact spring 73.
[0025] In the above structure, a connecting wire is connected to the wiring terminal on the same side of the circuit breaker housing 1 and the test button 71, and the other end of the connecting wire is connected to a test resistor electrically connected to the button sheet 74. In the closed state, the extension section 011 at one end of the limit torsion spring 01 abuts against the contact spring 73, and the test button 71 is pressed, and the button spring 72 abuts against the button sheet 74, thereby generating leakage, the leakage protection device 6 is activated, the utility model is opened, and the operating device 8 is reset; in the open state, the extension section 011 of the limit torsion spring 01 does not abut against the contact spring 73, and after the test button 71 is pressed, a circuit cannot be generated, thereby improving the safety and reliability of the utility model. In the existing leakage protection circuit breaker, when in the open state, the moving contact 81 is still connected to the test circuit, which is easy to be in a charged state. When the test button 71 is pressed, the circuit breaker is easily damaged. Therefore, in the open state of the utility model, the limit torsion spring 01 and the contact spring 73 do not abut, and will not carry current and cannot generate a circuit. Compared with the existing leakage protection circuit breaker, the utility model is safer. By setting the first connecting column 91, it is convenient to position and install the button spring 72, and by setting the second connecting column 92, it is convenient to position and install the contact spring 73, thereby improving the convenience of assembly of the utility model.
[0026] In this embodiment, a partition plate 93 is provided on the cover plate 9 between the button spring 72 and the extension section 011 .
[0027] By adopting the above structure, the creepage distance between the two can be increased, thereby improving the reliability of the utility model.
[0028] In this embodiment, a limiting groove 94 for installing the contact spring 73 is formed on the cover plate 9 .
[0029] The above structure can facilitate the installation of the contact spring 73 and can limit the contact spring 73, thereby improving the convenience of assembly of the utility model.
[0030] In this embodiment, a snap-in groove 95 for snapping in with the button piece 74 is formed on one side of the limiting groove 94 on the cover plate 9 .
[0031] The above structure can facilitate the positioning and installation of the button sheet 74, thereby improving the convenience of assembly of the utility model.
[0032] In this embodiment, a mounting groove 711 for accommodating the end of the button spring 72 is formed at the bottom of the test button 71 , and one end of the mounting groove 711 that abuts against the button spring 72 is in the shape of a chamfered arc.
[0033] By adopting the above structure, one end of the button spring 72 can be limited, and the test button 71 and the button spring 72 can be easily matched and abutted, thereby improving the reliability of the utility model.
[0034] In this embodiment, a clearance opening 712 is formed on one side of the installation groove 711 facing the cover plate 9 , and a stop block 96 is provided on the cover plate 9 at a position corresponding to the clearance opening 712 .
[0035] In the above structure, the stop block 96 cooperates with the clearance opening 712 to improve the stability of the displacement of the test button 71, thereby improving the reliability of the utility model.
[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications of the above assumptions should also be regarded as the protection scope of the present invention.
Claims
1. A circuit breaker with high safety, comprising a housing, a housing cover, a short-circuit protection device, an arc extinguishing device, an overload protection device, a leakage protection device, a test device, a contact assembly and an operating device for controlling the contact assembly to open or close the switch, wherein the contact assembly comprises a moving contact and a stationary contact, and is characterized in that: The side of the leakage protection device facing the shell cover is provided with a cover plate connected and fixed to the shell body, two moving contacts are provided, and a limit torsion spring for limiting the moving contact is provided on the two moving contacts, and an extension section is extended toward the cover plate at one end of the limit torsion spring facing the shell cover. The test device includes a test button, a button spring located below the test button, a contact spring located on the cover plate, and a button sheet located on one side of the contact spring. A first connecting column for the button spring to be socketed and a second connecting column for the contact spring to be socketed are provided on the cover plate, one end of the button spring abuts against the bottom of the test button, and abuts against the button sheet when the test button is pressed, and the other end is connected to one end of the contact spring, and the other end of the contact spring is located at the lower side of the extension section, and when the moving contact and the static contact are in the closed state, the extension section abuts against the contact spring.
2. A circuit breaker with high safety according to claim 1, characterized in that: A partition is provided on the cover plate between the button spring and the extension section.
3. A circuit breaker with high safety according to claim 2, characterized in that: The cover plate is provided with a limiting groove for installing a contact spring.
4. A circuit breaker with high safety according to claim 3, characterized in that: A clamping groove for clamping the button sheet is provided on one side of the cover plate located at the limiting groove.
5. A circuit breaker with high safety according to claim 1, characterized in that: The bottom end of the test button is provided with a mounting groove for accommodating the end of the button spring, and one end of the mounting groove abutting against the button spring is arranged in a chamfered arc.
6. A circuit breaker with high safety according to claim 5, characterized in that: A clearance opening is provided on one side of the installation groove facing the cover plate, and a stop block is provided on the cover plate at a position corresponding to the clearance opening.