A small circuit breaker operating mechanism and a small circuit breaker

Abstract

The present invention provides a small circuit breaker operating mechanism and a small circuit breaker, wherein the small circuit breaker operating mechanism includes: a moving contact, which is rotatably mounted on a housing, and has an opening position separated from a stationary contact, and a closing position in contact with the stationary contact; a push button, which is translatably mounted on the housing and rotatably connected to the moving contact, and the push button drives the moving contact to rotate toward the opening position or the closing position to achieve opening and closing actions; and a locking structure, which is used to lock the push button in the closed state. Compared with the prior art solution in which a handle needs to drive the moving contact to rotate through a U-shaped push rod and a jump buckle, the push button in the present invention can directly drive the above-mentioned moving contact to achieve opening and closing actions with the cooperation of the locking structure, and the push button does not need to drive the above-mentioned moving contact to rotate through a bracket assembly composed of a contact bracket, a jump buckle, and a lock buckle, and has the advantages of a simple transmission structure, a fast opening and closing speed, and low production and maintenance costs.

Description

Technical Field

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

[0002] A small circuit breaker refers to a protective device installed in a terminal distribution line. It is mainly used for overload and short-circuit protection of lines and electrical equipment. A small circuit breaker is generally composed of an operating mechanism, an electromagnetic tripping mechanism, a thermal tripping mechanism, an arc extinguishing mechanism and other parts. The operating mechanism refers to the component used to open and close the circuit breaker. The operating mechanism must ensure that the circuit breaker is closed reliably and that it is opened quickly under fault conditions. The performance of the operating mechanism directly affects the function of the small circuit breaker.

[0003] As shown in Figure 8, the conventional small circuit breaker operating mechanism uses a U-shaped push rod 02 on a rotating handle 01 to drive a support assembly consisting of a contact support 03, a trip buckle 04, a lock buckle 05, and a moving contact 06 to move, thereby driving the moving contact 06 to contact or disconnect with the static contact to achieve the opening and closing action. The above-mentioned support assembly is used to realize the linkage between the rotating handle and the moving contact 06, which not only affects the opening and closing speed of the circuit breaker, but also has the problems of complex transmission structure and high production and maintenance costs. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problem in the prior art that the handle of the operating mechanism needs to drive the moving contact through a transmission part such as a bracket assembly, resulting in a slow opening and closing speed of the circuit breaker, a complex transmission structure, and high production and maintenance costs, thereby providing a small circuit breaker operating mechanism and a small circuit breaker having the small circuit breaker operating mechanism.

[0005] To this end, the present invention provides a miniature circuit breaker operating mechanism, comprising:

[0006] The moving contact is rotatably mounted on the housing and has an opening position separated from the stationary contact and a closing position in contact with the stationary contact;

[0007] A push button is installed on the housing in a translational manner and is rotationally connected to the moving contact. The push button drives the moving contact to rotate toward the opening position or the closing position to realize the opening and closing actions;

[0008] The locking structure is used to lock the push button in the closed state.

[0009] As a preferred embodiment, the top of the moving contact is pivotally connected to the push button, a strip hole is formed in the middle, and the bottom is arranged opposite to the static contact. A first mounting column extending into the strip hole is provided on the shell, and the first mounting column is slidably arranged in the strip hole.

[0010] As a preferred solution, it also includes a first biasing member suitable for driving the push button to reset, one end of the first biasing member abuts against the housing, and the other end abuts against the push button.

[0011] As a preferred solution, the locking structure includes:

[0012] A lock member is rotatably mounted on the housing, and a first rotating arm thereof is provided with a lock tooth that cooperates with the slot of the push button to lock the lock member, and the lock member has a locking position that cooperates with the push button to lock the push button, and an unlocking position that is separated from the push button;

[0013] A second biasing member has one end connected to the housing and the other end connected to the locking member, and applies a biasing force to the locking member to rotate toward the locking position.

[0014] As a preferred solution, the contact surface between the locking tooth and the locking slot is an inclined surface, so that the push button is driven by an external force to drive the locking slot to separate from the locking tooth.

[0015] As a preferred solution, the housing is provided with a button which is arranged opposite to the first rotating arm and is suitable for driving the locking member to rotate from the locking position to the unlocking position.

[0016] As a preferred solution, it further includes a third biasing member, one end of which is connected to the housing, and the other end of which is connected to the moving contact, so as to apply a biasing force to the moving contact to move toward the closing position.

[0017] As a preferred solution, a second mounting column is provided on one side of the housing close to the inner wall thereof and cooperates with the moving contact to block and limit the opening position of the moving contact.

[0018] As a preferred solution, a slide groove is formed on the housing for the slider of the push button to reciprocate, and the first biasing member is arranged in the slide groove.

[0019] The present invention provides a miniature circuit breaker, comprising the miniature circuit breaker operating mechanism as described above.

[0020] The technical solution of the present invention has the following advantages:

[0021] 1. The miniature circuit breaker operating mechanism provided by the present invention comprises a moving contact, a push button and a locking structure. The push button can be installed on the housing in a translational manner and is connected to the moving contact in rotation. The push button drives the moving contact to rotate toward the opening position or the closing position to realize the opening and closing action. Since the push button is directly connected to the moving contact in rotation, the push button reciprocates to drive the moving contact and the static contact to open and close. Compared with the solution in the prior art that the handle needs to drive the moving contact to rotate through a U-shaped push rod and a jump buckle, the push button that can be translated in the present invention with the cooperation of the locking structure can directly drive the above-mentioned moving contact to realize the opening and closing action. The push button does not need to drive the above-mentioned moving contact to rotate through a bracket assembly composed of a contact bracket, a jump buckle and a lock buckle. It has the advantages of simple transmission structure, fast opening and closing speed, and low production and maintenance cost.

[0022] 2. The operating mechanism of the small circuit breaker provided by the present invention has a top of the moving contact pivotally connected to the push button, a strip hole formed in the middle, and a bottom arranged opposite to the static contact. A first mounting column extending into the strip hole is arranged on the shell, and the first mounting column is slidably arranged in the strip hole. When the push button reciprocates, it drives the moving contact to move up and down relative to the first mounting column and rotates around the first mounting column. The moving contact has the advantage of a simple structure.

[0023] 3. The locking structure of the miniature circuit breaker operating mechanism provided by the present invention includes: a locking member rotatably mounted on the housing, a first rotating arm of which is provided with a locking tooth that cooperates with the slot of the push button to lock, the locking member having a locking position that cooperates with the push button to lock the push button, and an unlocking position that is separated from the push button; a second biasing member, one end of which is connected to the housing and the other end of which is connected to the locking member, to apply a biasing force to the locking member to rotate toward the locking position. The inventor creatively sets the locking member to cooperate with the push button for locking. Compared with the locking method of the prior art in which the locking member cooperates with the jump button for locking, the jump button is omitted, the structure is simpler, and the production and maintenance costs are low.

[0024] 4. In the miniature circuit breaker operating mechanism provided by the present invention, the contact surface between the locking tooth and the slot is an inclined surface, so that the push button is driven by an external force to drive the slot and the locking tooth to separate, that is, the push button can be manually driven to achieve opening. The setting of the inclined surface has the advantage of simple structure.

[0025] 5. The miniature circuit breaker operating mechanism provided by the present invention has a button on the shell which is arranged opposite to the first rotating arm and is suitable for driving the locking member to rotate from the locked position to the unlocked position. When the button drives the locking member to rotate to the unlocked position, the push button drives the moving contact to the opening position under the action of the first biasing member, thereby realizing opening. On the basis of manually driving the push button to realize opening, the inventor has added a method of driving the push button to realize opening by a button, so that the opening operation is simpler.

[0026] 6. The miniature circuit breaker operating mechanism provided by the present invention further includes a third biasing member, one end of which is connected to the housing, and the other end of which is connected to the moving contact, for applying a biasing force to the moving contact to move toward the closing position. In the closing position, the third biasing member keeps the moving contact and the static contact in a pressed and abutted relationship, so that the moving contact and the static contact will not be separated due to vibration, thereby preventing an arc from being generated, thereby extending the service life of the moving contact and the static contact.

[0027] 7. The miniature circuit breaker operating mechanism provided by the present invention has a second mounting column disposed on one side of the shell near the inner wall thereof, which cooperates with the moving contact to block and limit the opening position of the moving contact, thereby enabling the moving contact to maintain a certain gap with the inner wall of the shell to prevent the high temperature of the moving contact from melting the plastic shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A three-dimensional diagram of a miniature circuit breaker of the present invention;

[0030] Figure 2 It is a structural schematic diagram of the operating mechanism of a miniature circuit breaker of the present invention in a closed state;

[0031] Figure 3 It is a structural schematic diagram of the operating mechanism of a miniature circuit breaker of the present invention in an open state;

[0032] Figure 4 for Figure 2 A three-dimensional diagram after removing the shell;

[0033] Figure 5 It is a schematic diagram of the explosion structure of the push button and the moving contact;

[0034] Figure 6 is a schematic diagram of the structure of a locking member;

[0035] Figure 7 It is a schematic diagram of the exploded structure of the push button and the housing;

[0036] Figure 8 It is a structural schematic diagram of the operating mechanism of a small and medium-sized circuit breaker in the prior art.

[0037] Description of reference numerals: 01, handle; 02, U-shaped push rod; 03, contact bracket; 04, trip buckle; 05, lock buckle; 06, moving contact;

[0038] 1. Shell; 11. First mounting post; 12. Second mounting post; 13. Slide groove; 2. Moving contact; 21. Strip hole; 22. Third biasing member; 3. Stationary contact; 4. Push button; 41. First biasing member; 42. Slot; 43. Slider; 5. Locking member; 51. First rotating arm; 52. Locking tooth; 53. Second biasing member; 54. Contact surface; 55. Second rotating arm; 6. Push button; 61. Stopper. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] Example

[0044] This embodiment provides a miniature circuit breaker, such as Figure 1 , Figure 5 and Figure 7 As shown, it is provided with an operating mechanism, which includes a moving contact 2, a push button 4, a button 6 and a locking structure.

[0045] The moving contact 2 is rotatably mounted on the housing 1, and has an opening position separated from the static contact 3, and a closing position in contact with the static contact 3. The top of the moving contact 2 is pivotally connected to the push button 4, a strip hole 21 is formed in the middle, and the bottom is arranged opposite to the static contact 3. The housing 1 is provided with a first mounting column 11 extending into the strip hole 21, and the first mounting column 11 is slidably arranged in the strip hole 21. The housing 1 is provided with a third biasing member 22 and a second mounting column 12. One end of the third biasing member 22 is connected to the housing 1, and the other end is connected to the moving contact 2, so as to apply a biasing force to the moving contact 2 to move toward the closing position. The housing 1 is provided with a second mounting column 12 near its inner wall to block and cooperate with the moving contact 2 to limit the opening position of the moving contact 2.

[0046] The push button 4 can be installed on the shell 1 in a translational manner. The top of the push button 4 protrudes from the shell 1. The bottom slider 43 is rotatably connected to the moving contact 2. A slide groove 13 is formed on the shell for the slider 43 of the push button 4 to reciprocate. The first biasing member 41 is arranged in the slide groove 13. One end of the first biasing member 41 abuts against the shell 1, and the other end abuts against the push button 4, so as to drive the push button 4 to reset.

[0047] The locking structure includes a locking member 5 and a second biasing member 53 .

[0048] like Figure 6 As shown, the locking member 5 is rotatably mounted on the housing 1, and has a first rotating arm 51 and a second rotating arm 55. The first rotating arm 51 is provided with a locking tooth 52 that cooperates with the slot 42 of the push button 4 to lock, and the contact surface 54 between the locking tooth 52 and the slot 42 is an inclined surface, so that the push button 4 is driven by an external force to drive the slot 42 to separate from the locking tooth 52. The locking member 5 has a locking position that cooperates with the push button 4 to lock the push button 4, and an unlocking position that is separated from the push button 4. The second rotating arm 55 of the locking member 5 is arranged opposite to the push rod of the electromagnetic tripping mechanism (it should be noted that the electromagnetic tripping mechanism is an existing mature technology, so its internal structure and working principle are not described in detail). When a short circuit occurs, the push rod of the electromagnetic tripping mechanism will drive the second rotating arm 55 to rotate, thereby rotating the locking member 5 from the locked position to the unlocked position. The push button 4 is reset under the action of the first biasing member 41, driving the moving contact 2 to separate from the static contact 3, thereby realizing the opening of the switch.

[0049] The second biasing member 53 has one end connected to the housing 1 and the other end connected to the locking member 5 , and applies a biasing force to the locking member 5 to rotate toward the locking position.

[0050] The button 6 is provided with a top protruding from the shell 1 and a bottom opposite to the first rotating arm 51. The side wall of the button 6 is formed with a mounting groove inserted into the shell 1 and a block 61 that cooperates with the top wall and the bottom wall of the mounting groove. The button 6 is driven by an external force to drive the first rotating arm 51 to rotate, thereby driving the locking member 5 to rotate from the locked position to the unlocked position. The push button 4 is reset under the action of the first biasing member 41, driving the moving contact 2 to separate from the static contact 3, thereby realizing the opening of the switch.

[0051] The miniature circuit breaker operating mechanism of the present invention has a push button 4 that can be translated in cooperation with the locking structure and can directly drive the moving contact 2 to realize the opening and closing actions. The push button 4 does not need to drive the moving contact 2 to rotate through a bracket assembly composed of a contact bracket, a jump buckle, and a lock buckle. It has the advantages of a simple transmission structure, a fast opening and closing speed, and a low production and maintenance cost.

[0052] In this embodiment, the first biasing member 41 , the second biasing member 53 , and the third biasing member 22 are springs.

[0053] As a convertible embodiment, the first mounting column 11 and the second mounting column 12 are two parallel mounting columns of a U-shaped rod inserted into the housing mounting groove.

[0054] like Figures 2 to 4 As shown, the working principle of the miniature circuit breaker operating mechanism of the present invention is as follows:

[0055] Closing:

[0056] In the initial state, the operating mechanism is in Figure 3 The switch-off position shown in FIG. 1 is shown in FIG. 1 . The push button 4 is manually pushed to overcome the force of the first biasing member 41 and move to the right. The push button 4 drives the moving contact 2 to rotate clockwise around the first mounting column 11. When the push button 4 moves to Figure 2 In the closing position shown, the moving contact 2 is in contact with the stationary contact 3 to achieve closing. At this time, the locking teeth 52 of the locking member 5 cooperate with the locking groove 42 of the push button 4 to lock.

[0057] Opening:

[0058] 1) Open the gate by pushing the button:

[0059] The push button 4 is manually pushed to move to the left. Since the contact surface 54 where the lock tooth 52 cooperates with the slot 42 is an inclined surface, when the push button 4 moves to the left, the lock member 5 is driven to rotate counterclockwise, and the moving contact 2 is driven to rotate counterclockwise around the first mounting column 11, so that the moving contact 2 is separated from the static contact 3, thereby achieving opening of the switch.

[0060] 2) Open the gate by pressing a button:

[0061] The manual drive button 6 moves downward, the button 6 abuts against the first rotating arm 51, driving the locking member 5 to rotate counterclockwise, the locking teeth 52 of the locking member 5 and the slot 42 of the push button 4 are unlocked, and the push button 4 moves leftward under the action of the first biasing member 41, and drives the moving contact 2 to rotate counterclockwise around the first mounting column 11, so that the moving contact 2 is separated from the static contact 3, thereby realizing the opening of the switch.

[0062] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. 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 and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A small circuit breaker operating mechanism, characterized in that: include: The moving contact (2) is rotatably mounted on the housing (1), and has an opening position separated from the stationary contact (3), and a closing position in contact with and communicating with the stationary contact (3); A push button (4) is installed on the housing (1) in a translationally movably manner and is rotationally connected to the moving contact (2), wherein the push button (4) drives the moving contact (2) to rotate toward the opening position or the closing position to realize an opening and closing action; A locking structure, used to lock the push button (4) in a closed state; A first biasing member (41), one end of which abuts against the housing (1) and the other end of which abuts against the push button (4), suitable for driving the push button (4) to reset; The locking structure comprises: A locking member (5) is rotatably mounted on the housing (1), the locking member (5) comprising a first rotating arm (51) and a second rotating arm (55), the first rotating arm (51) being provided with a locking tooth (52) that cooperates with the slot (42) of the push button (4) to lock, the locking member (5) having a locking position that cooperates with the push button (4) to lock the push button (4), and an unlocking position that is separated from the push button (4); the second rotating arm (55) is arranged opposite to the push rod of the electromagnetic tripping mechanism; A second biasing member (53), one end of which is connected to the housing (1) and the other end of which is connected to the locking member (5), for applying a biasing force to the locking member (5) to rotate in the direction of the locking position; The top of the movable contact (2) is pivotally connected to the push button (4), a strip-shaped hole (21) is formed in the middle, and the bottom is arranged opposite to the stationary contact (3), and the housing (1) is provided with a first mounting column (11) extending into the strip-shaped hole (21), and the first mounting column (11) is slidably arranged in the strip-shaped hole (21); The contact surface (54) where the locking tooth (52) and the locking groove (42) cooperate with each other is an inclined surface, so that the push button (4) is driven by an external force to drive the locking groove (42) to separate from the locking tooth (52); The housing (1) is provided with a button (6) which is arranged opposite to the first rotating arm (51) and is suitable for driving the locking member (5) to rotate from the locking position to the unlocking position; It also comprises a third biasing member (22), one end of the third biasing member (22) being connected to the housing (1), and the other end being connected to the moving contact (2), for applying a biasing force to the moving contact (2) to move toward the closing position; The housing (1) is provided with a second mounting column (12) on one side close to the inner wall thereof, which is engaged with the moving contact (2) to limit the opening position of the moving contact (2); The housing (1) is formed with a slide groove (13) for the sliding block (43) of the push button (4) to reciprocate, and the first biasing member (41) is arranged in the slide groove (13).

2. A miniature circuit breaker, characterized in that: It comprises the miniature circuit breaker operating mechanism as claimed in claim 1.

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