A plug-in miniature circuit breaker

Abstract

The present invention discloses a plug-in small circuit breaker, including a housing, a button and a locking mechanism, a short-circuit protection mechanism, an arc extinguishing chamber, an outlet terminal, a signal terminal, an overload protection mechanism, an operating mechanism and an inlet terminal. The button and the locking mechanism are installed in the housing and connected to the operating mechanism; the short-circuit protection mechanism is connected to the outlet terminal through a copper soft connection and installed in the housing; the operating mechanism is connected to the overload protection mechanism, and the overload protection mechanism is connected to the outlet terminal; the operating mechanism is contacted with the short-circuit protection mechanism by operating the button and the locking mechanism, so that the inlet terminal and the outlet terminal are connected; the signal terminal is connected to the double metal bracket in the overload protection mechanism, so as to form an equipotential with the moving contact and realize the closing and opening signal detection function. The plug-in small circuit breaker described in the present invention is particularly suitable for narrow spaces, can realize high-density power distribution, can improve installation efficiency, and is convenient, safe and reliable during use and replacement.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a plug-in miniature circuit breaker. Background Art

[0002] A circuit breaker is a mechanical switching device that can connect, carry and disconnect current under normal circuit conditions, and can also connect, carry for a certain period of time and disconnect current under specified abnormal conditions. Therefore, it is widely used in power distribution systems.

[0003] There are three main ways to install circuit breakers: fixed, drawer and plug-in. The function of the circuit breaker is to cut off and connect the load circuit, as well as cut off the fault circuit to prevent the accident from expanding and ensure safe operation. However, with the continuous development and upgrading of the power distribution system, fixed circuit breakers are not convenient enough in terms of installation, replacement and maintenance. Especially for the most widely used small circuit breakers, there are currently few plug-in small circuit breakers on the market, and most of them are installed through accessory bases. Due to the large space occupied, it is necessary to set up a plug-in small circuit breaker for use in small spaces, which will greatly improve the power distribution density and the convenience of installation, replacement and maintenance. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a circuit breaker with a simple structure, convenient operation and assembly, which can greatly improve the power distribution density and the installation efficiency of small circuit breakers, and is also convenient for replacement and maintenance. Specifically, it is a plug-in small circuit breaker.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a plug-in small circuit breaker, including a shell, a button and a locking mechanism, a short-circuit protection mechanism, an arc extinguishing chamber, an outlet terminal, a signal terminal, an overload protection mechanism, an operating mechanism and an inlet terminal, the button and the locking mechanism are installed in the shell and connected to the operating mechanism; the short-circuit protection mechanism is connected to the outlet terminal through a copper soft connection and is installed in the shell; the operating mechanism is connected to the overload protection mechanism, and the overload protection mechanism is connected to the outlet terminal; the operating mechanism includes a contact support, a lock and a moving contact, the lock and the moving contact are both arranged on the contact support, the inlet terminal includes a spring sheet and a wiring board; the wiring board is inserted into the spring sheet and installed together in the shell. ; The overload protection mechanism includes a first soft copper wire, a bimetallic strip, a pull rod, a second soft copper wire and a bimetallic bracket; one end of the first soft copper wire is connected to the terminal block, and the other end is connected to the bimetallic strip; the bimetallic strip is fixed on the bimetallic bracket; one end of the second soft copper wire is connected to the bimetallic strip, and the other end is connected to the moving contact; one end of the pull rod is limited by the groove on the bimetallic strip, and the other end extends into the groove of the lock; the pull rod is moved horizontally and drives the operating mechanism through the operating button and the locking mechanism, so that the moving contact in the operating mechanism contacts the short-circuit protection mechanism, thereby realizing the connection between the incoming line and the outgoing line; the signal end is connected to the bimetallic bracket in the overload protection mechanism, so as to form an equipotential with the moving contact and realize the closing and opening signal detection function.

[0006] Furthermore, the present invention discloses a plug-in miniature circuit breaker, wherein the button and locking mechanism include a button, a buckle, a reset spring and an indicator; a U-shaped groove and a cylindrical structure are provided in the button, and a structure with a boss is provided on the button, the boss can accommodate the indicator, a cylindrical surface is provided on the indicator, and a limiting groove corresponding to the cylindrical surface is provided on the shell; the button is installed in the shell, and has only one degree of translational freedom through the shell limit, and is linked to the operating mechanism through the U-shaped groove; the indicator is installed in the button through the boss on the button, and can rotate around the boss, and the cylindrical surface on the indicator is inserted into the corresponding limiting groove in the shell; the buckle has only one degree of translational freedom along the edge through the shell limit, and cooperates with the cylindrical structure on the button to realize the functions of false closing and false opening; one end of the reset spring rests on the protruding structure of the shell, and the other end rests on the buckle.

[0007] Furthermore, the present invention describes a plug-in small circuit breaker, wherein the short-circuit protection mechanism includes a shaft, a bracket, a yoke, an iron core, a coil, a soft copper wire, a plug, an arc-starting piece, a silver point, a static contact and an armature, the coil and the plug are connected by a soft copper wire, the arc-starting piece is welded on the static contact by a silver point, and the static contact is welded to the other end of the coil; the coil is inserted into the iron core, the yoke, the iron core and the bracket are fixed as an integral structure by riveting, the armature is inserted into the bracket through the shaft, and the armature can rotate around the shaft; the operating button and the locking mechanism are used to make it move horizontally and drive the operating mechanism, so that the moving contact in the operating mechanism contacts the silver point in the short-circuit protection mechanism, thereby realizing the connection between the incoming line and the outgoing line; when a large short-circuit current passes through the coil, the armature will rotate around the axis under the magnetic field generated by the coil, and the armature will flap the lock during the rotation process, thereby forming a disconnection circuit.

[0008] Furthermore, in the plug-in miniature circuit breaker described in the present invention, the arc extinguishing chamber is installed in the housing and is located between the arc striking piece and the double metal bracket. The arc extinguishing chamber is helpful to accelerate the transfer of the arc, and utilizes the arc extinguishing principle of the metal grid to accelerate the extinction of the arc, thereby protecting the circuit breaker and power lines and equipment.

[0009] Furthermore, in a plug-in miniature circuit breaker described in the present invention, the signal end includes a diode and a plug connector, one end of the diode is welded on a double metal bracket, and the other end is welded on a plug connector; the plug connector and the moving contact always maintain the same potential. When the circuit breaker is in use, when the moving contact is in a closed or open state, the potential will change accordingly, and the equivalent plug connector potential will also change accordingly. The circuit breaker status monitoring function is realized through the detection of closing and opening signals.

[0010] Furthermore, in the plug-in miniature circuit breaker described in the present invention, the operating mechanism and the overload protection mechanism are connected under the action of a bimetallic strip, a pull rod and a lock. When an overload current passes through the bimetallic strip, the bimetallic strip will bend due to thermal deformation under the action of the current, and the pull rod is pulled to move by the bending deformation of the bimetallic strip, and the lock is unlocked by the pull rod, so that the circuit breaker is disconnected, thereby achieving the overload protection function of the circuit breaker.

[0011] Compared with the prior art, the plug-in miniature circuit breaker of the present invention has the following beneficial effects: in the process of closing and opening the circuit breaker, it can be operated by operating buttons and locking mechanisms, has the advantages of being simple to use, is particularly suitable for narrow spaces, can realize high-density power distribution, can improve installation efficiency, is convenient, safe and reliable during use and replacement, has low production cost, is highly practical, and has a wide range of application places. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0013] Figure 1 This is an overall schematic diagram of the opening state of the present invention;

[0014] Figure 2 It is an overall schematic diagram of the closing state of the present invention;

[0015] Figure 3 It is a schematic diagram of the installation structure of the button and the locking mechanism described in the present invention;

[0016] Figure 4 It is a structural schematic diagram of the short-circuit protection mechanism of the present invention;

[0017] Figure 5 It is a schematic diagram of the installation structure of the signal terminal, overload protection mechanism, operating mechanism and incoming line terminal described in the present invention;

[0018] Figure 6 It is a schematic diagram of the buckle structure in the button and locking mechanism of the present invention;

[0019] Figure 7 It is a schematic diagram of the double metal bracket structure in the overload protection mechanism of the present invention.

[0020] As shown in the figure: 1-housing, 2-button and locking mechanism, 201-button, 201a-U-shaped groove, 201b-cylindrical structure, 202-buckle, 202a-extending edge, 203-reset spring, 204-indicator, 204a-cylindrical surface, 3-housing, 301-axis, 302-bracket, 303-yoke, 304-iron core, 305-coil, 306-soft copper wire, 307-plug, 308-arc starter, 309-silver dot, 310-static contact, 311-armature, 4-arc extinguishing chamber, 5-outlet terminal, 6-signal terminal, 601-diode, 602-plug connector, 7-overload protection mechanism, 701-first soft copper wire, 702-bimetallic sheet, 703-pull rod, 704-second soft copper wire, 705-bimetallic bracket, 8-operating mechanism, 801-contact support, 802-lock, 803-moving contact, 9-inlet terminal, 901-spring sheet, 902-terminal block. DETAILED DESCRIPTION

[0021] To further illustrate the concept of the present invention, the specific implementation of the present invention will be further described in detail below with reference to the accompanying drawings:

[0022] like Figures 1 to 7As shown, a plug-in miniature circuit breaker described in the present invention includes a housing 1, a button and a locking mechanism 2, a short-circuit protection mechanism 3, an arc extinguishing chamber 4, an outlet terminal 5, a signal terminal 6, an overload protection mechanism 7, an operating mechanism 8 and an inlet terminal 9, wherein the button and the locking mechanism 2 are installed in the housing 1 and connected to the operating mechanism 8; the short-circuit protection mechanism 3 is connected to the outlet terminal 5 through a copper soft connection and is installed in the housing 1; the operating mechanism 8 is connected to the overload protection mechanism 7, and the overload protection mechanism 7 is connected to the outlet terminal 5; the operating mechanism 8 includes a contact support 801, a lock 802 and a moving contact 803, and the lock 802 and the moving contact 803 are both arranged on the contact support 801, and the inlet terminal 9 includes a spring sheet 901 and a terminal block 902; the terminal block 902 is inserted into the spring sheet 901 and installed together in the housing 1; the overload protection mechanism 7 includes a first Soft copper wire 701, bimetallic strip 702, pull rod 703, second soft copper wire 704 and bimetallic bracket 705; one end of the first soft copper wire 701 is connected to the terminal block 902, and the other end is connected to the bimetallic strip 702; the bimetallic strip 702 is fixed on the bimetallic bracket 705; one end of the second soft copper wire 704 is connected to the bimetallic strip 702, and the other end is connected to the moving contact 803; one end of the pull rod 703 is limited by the groove on the bimetallic strip 702, and the other end extends into the groove of the lock buckle 802; the operating button and the locking mechanism 2 are used to make it move horizontally and drive the operating mechanism 8, so that the moving contact 803 in the operating mechanism 8 is in contact with the short-circuit protection mechanism 3, so as to realize the connection between the incoming line terminal 9 and the outgoing line terminal 5; the signal terminal 6 is connected to the bimetallic bracket 705 in the overload protection mechanism 7, so as to realize the equipotential with the moving contact 803 and realize the closing and opening signal detection function.

[0023] Further, the plug-in miniature circuit breaker of the present invention, wherein the button and locking mechanism 2 includes a button 201, a buckle 202, a reset spring 203 and an indicator 204, a U-shaped groove 201a and a cylindrical structure 201b are provided in the button 201, and a structure with a boss is provided on the button 201, the boss can accommodate the indicator 204, a cylindrical surface 204a is provided on the indicator 204, and a limiting groove corresponding to the cylindrical surface 204a is provided on the housing 1, and the button 201 is installed in the housing 1 and is limited by the housing 1. The position has only one degree of translational freedom, and is linked to the operating mechanism 8 through the U-shaped groove 201a; the indicator 204 is installed in the button 201 through the boss on the button 201, and can rotate around the boss, and the cylindrical surface 204a on the indicator 204 is inserted into the corresponding limiting groove in the shell 1; the buckle 202 has only one degree of translational freedom along the edge 202a through the limitation of the shell 1, and cooperates with the cylindrical structure 201b on the button 201 to realize the function of mis-closing and mis-opening; one end of the reset spring 203 rests on the protruding structure of the shell 1, and the other end rests on the buckle 202.

[0024] Furthermore, in the plug-in miniature circuit breaker described in the present invention, the short-circuit protection mechanism 3 includes a shaft 301, a bracket 302, a yoke 303, an iron core 304, a coil 305, a soft copper wire 306, a plug 307, an arc-starting piece 308, a silver point 309, a static contact 310 and an armature 311, the coil 305 and the plug 307 are connected by a soft copper wire 306, the arc-starting piece 308 is welded to the static contact 310 through the silver point 309, and the static contact 310 is welded to the other end of the coil 305; the coil 305 is inserted into the iron core 304, and the yoke 303, the iron core 304 and the bracket 302 are riveted It is fixed as an integrated structure, and the armature 311 penetrates into the bracket 302 through the shaft 301. The armature 311 can rotate around the shaft 301; it is made to move horizontally and drive the operating mechanism 8 through the operating button and the locking mechanism 2, so that the moving contact 803 in the operating mechanism 8 contacts the silver point 309 in the short-circuit protection mechanism 3, thereby realizing the connection between the incoming terminal 9 and the outgoing terminal 5; when a large short-circuit current passes through the coil 305, the armature 311 will rotate around the shaft 301 under the magnetic field generated by the coil 305. During the rotation process, the armature 311 will flap the lock buckle 802 to form a disconnection circuit, thereby realizing the disconnection function through the short-circuit protection mechanism 3.

[0025] Furthermore, in the plug-in miniature circuit breaker described in the present invention, the arc extinguishing chamber 4 is installed in the housing 1 and is located between the arc striking piece 308 and the double metal bracket 705. The arc extinguishing chamber 4 is helpful to accelerate the transfer of the arc, and utilizes the arc extinguishing principle of the metal grid to accelerate the extinction of the arc, thereby protecting the circuit breaker and power lines and equipment.

[0026] Furthermore, in a plug-in miniature circuit breaker described in the present invention, the signal end 6 includes a diode 601 and a plug connector 602, one end of the diode 601 is welded on the double metal bracket 705, and the other end is welded on the plug connector 602; the plug connector 602 and the moving contact 803 always maintain the same potential. When the circuit breaker is in use, when the moving contact 803 is in a closed or open state, the potential will change accordingly, and the potential of the plug connector 602 will also change accordingly. The circuit breaker status monitoring function is realized through the detection of the closing and opening signals.

[0027] Furthermore, in the plug-in miniature circuit breaker described in the present invention, between the operating mechanism 8 and the overload protection mechanism 7, under the action of the bimetallic strip 702, the pull rod 703 and the lock 802, when the overload current passes through the bimetallic strip 702, the bimetallic strip 702 will bend due to thermal deformation under the action of the current, and the bending deformation of the bimetallic strip 702 is used to pull the pull rod 703 to move, and the lock 802 is unlocked by the pull rod 703, so that the circuit breaker is disconnected, thereby achieving the overload protection function of the circuit breaker.

[0028] In actual application, a plug-in miniature circuit breaker according to the present invention is used. When installing, the circuit breaker can be directly pushed into the cabinet. Since the inlet terminal 9 includes a spring sheet 901 and a terminal block 902; the terminal block 902 is inserted into the spring sheet 901 and installed together in the housing 1, the user can directly insert the cable into the spring sheet 901 when using it. The cable is fully in contact with the terminal block 902 under the clamping force of the spring sheet 901, thereby replacing the original screw wiring method, which is convenient, safe and reliable. Since the overload protection mechanism 7 is provided, when the overload current passes through the bimetallic sheet 702, The bimetallic strip 702 will bend due to thermal deformation under the action of electric current, and the bending deformation of the bimetallic strip 702 is used to pull the pull rod 703 to move, and the pull rod 703 drives the lock 802 to unlock, so that the circuit breaker is disconnected, thereby achieving the overload protection function of the circuit breaker; in the process of closing and opening, the button and the locking mechanism 2 can be operated, and the built-in locking function can prevent the circuit breaker from being closed when it is not inserted in place; in the closed state, the circuit breaker can only be pulled out of the cabinet by pulling the handle to open it and then continuing to pull it, which has the advantages of simple use, etc.

[0029] It can be seen that the plug-in small circuit breaker described in the invention is particularly suitable for small spaces, can achieve high-density power distribution, can improve installation efficiency, is convenient, safe and reliable during use and replacement, has low production costs, is highly practical, and has a wide range of applications.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A plug-in miniature circuit breaker, characterized in that: The invention comprises a housing (1), a button and a locking mechanism (2), a short-circuit protection mechanism (3), an arc extinguishing chamber (4), an outlet terminal (5), a signal terminal (6), an overload protection mechanism (7), an operating mechanism (8) and an inlet terminal (9), wherein the button and the locking mechanism (2) are installed in the housing (1) and connected to the operating mechanism (8); the short-circuit protection mechanism (3) is connected to the outlet terminal (5) via a copper flexible connection and is installed in the housing (1); the operating mechanism (8) is connected to the overload protection mechanism (7); the overload protection mechanism (8) is connected to the outlet terminal (5) via a copper flexible connection; the overload protection mechanism (7) is connected to the inlet terminal (9); the overload protection mechanism (8) is connected to the inlet terminal (5) via a copper flexible connection; the overload protection mechanism (7) is connected to the inlet terminal (5) via a copper flexible connection; the overload protection mechanism (8) is connected to the inlet terminal (5) via a copper flexible connection; the overload protection mechanism (7) is connected to the inlet terminal (9); the overload protection mechanism (7 ... The overload protection mechanism (7) is connected to the outlet terminal (5); the operating mechanism (8) comprises a contact support (801), a lock (802) and a moving contact (803); the lock (802) and the moving contact (803) are both arranged on the contact support (801); the inlet terminal (9) comprises a spring sheet (901) and a wiring board (902); the wiring board (902) is inserted into the spring sheet (901) and installed together in the housing (1); the overload protection mechanism (7) comprises a first soft copper wire ( 701), a bimetallic strip (702), a pull rod (703), a second soft copper wire (704) and a bimetallic bracket (705); one end of the first soft copper wire (701) is connected to the wiring board (902), and the other end is connected to the bimetallic strip (702); the bimetallic strip (702) is fixed on the bimetallic bracket (705); one end of the second soft copper wire (704) is connected to the bimetallic strip (702), and the other end is connected to the moving contact (803); one end of the pull rod (703) is connected to the moving contact (803) through the bimetallic strip ( The first end of the signal terminal (6) is limited by the groove on the locking mechanism (702), and the other end extends into the groove of the locking buckle (802); the operating button and the locking mechanism (2) are used to make it move horizontally and drive the operating mechanism (8), so that the moving contact (803) in the operating mechanism (8) contacts the short-circuit protection mechanism (3), thereby realizing the connection between the incoming line terminal (9) and the outgoing line terminal (5); the signal terminal (6) is connected to the double metal bracket (705) in the overload protection mechanism (7), thereby realizing the same potential as the moving contact (803), and realizing the closing and opening signal detection function; The button and locking mechanism (2) comprises a button (201), a buckle (202), a return spring (203) and an indicator (204); a U-shaped groove (201a) and a cylindrical structure (201b) are provided in the button (201); a structure with a boss is provided on the button (201); the boss can accommodate the indicator (204); a cylindrical surface (204a) is provided on the indicator (204); a limiting groove corresponding to the cylindrical surface (204a) is provided on the housing (1); the button (201) is installed in the housing (1) and has only one free translation through the housing (1) limiting position. The indicator (204) is installed in the button (201) through a boss on the button (201) and can rotate around the boss. The cylindrical surface (204a) on the indicator (204) is inserted into a corresponding limiting groove in the housing (1). The buckle (202) has only one degree of translational freedom along the edge (202a) through the limit of the housing (1) and cooperates with the cylindrical structure (201b) on the button (201) to realize the functions of false closing and false opening. One end of the reset spring (203) rests on the protruding structure of the housing (1), and the other end rests on the buckle (202). The short-circuit protection mechanism (3) comprises a shaft (301), a bracket (302), a yoke (303), an iron core (304), a coil (305), a soft copper wire (306), a plug (307), an arc-starting piece (308), a silver point (309), a static contact (310) and an armature (311); the coil (305) and the plug (307) are connected via the soft copper wire (306); the arc-starting piece (308) is welded to the static contact (310) via the silver point (309); and the static contact (310) is welded to the other end of the coil (305); the coil (305) is inserted into the iron core (304); the yoke (303), the iron core (304) and the bracket (302) are connected to the static contact (310) via the silver point (309); The armature (311) is fixed as an integral structure through riveting, and penetrates into the bracket (302) through the shaft (301). The armature (311) can rotate around the shaft (301); the armature (311) is caused to move in parallel through the operating button and the locking mechanism (2) and drives the operating mechanism (8), so that the moving contact (803) in the operating mechanism (8) contacts the silver point (309) in the short-circuit protection mechanism (3), thereby realizing the connection between the incoming terminal (9) and the outgoing terminal (5); when a large short-circuit current passes through the coil (305), the armature (311) will rotate around the shaft (301) under the magnetic field generated by the coil (305), and the armature (311) will flap the lock buckle (802) during the rotation process, thereby forming a switch-off circuit.

2. A plug-in miniature circuit breaker according to claim 1, characterized in that: The arc extinguishing chamber (4) is installed in the housing (1) and is located between the arc striking piece (308) and the double metal bracket (705). The arc extinguishing chamber (4) is helpful to accelerate the transfer of the arc and accelerate the extinction of the arc by utilizing the arc extinguishing principle of the metal grid, thereby protecting the circuit breaker and the power lines and equipment.

3. The plug-in miniature circuit breaker according to claim 1, characterized in that: The signal end (6) comprises a diode (601) and a plug connector (602); one end of the diode (601) is welded to the double metal bracket (705), and the other end is welded to the plug connector (602); the plug connector (602) and the moving contact (803) always maintain the same potential; when the circuit breaker is in use, when the moving contact (803) is in a closed or open state, the potential will change accordingly, and the potential of the plug connector (602) will also change accordingly, and the circuit breaker status monitoring function is realized through the detection of the closing and opening signals.

4. A plug-in miniature circuit breaker according to claim 1, characterized in that: Between the operating mechanism (8) and the overload protection mechanism (7), under the action of the bimetallic strip (702), the pull rod (703) and the lock (802), when an overload current passes through the bimetallic strip (702), the bimetallic strip (702) will bend due to thermal deformation under the action of the current, and the pull rod (703) is pulled to move by the bending deformation of the bimetallic strip (702), and the lock (802) is unlocked by the pull rod (703), so that the circuit breaker is disconnected, thereby achieving the overload protection function of the circuit breaker.

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