Miniature circuit breaker

Abstract

The utility model discloses a miniature circuit breaker which comprises a base, a handle, a tripping piece and a contact frame are arranged in the base, and the handle is in linkage connection with the contact frame and used for pushing the contact frame and the tripping piece to rotate and move. When closing is carried out, the handle is rotated, so that a locking holding point is formed between the handle and the contact frame; and the tripping piece is used for disassembling the locking holding point, so that the tripping piece and the contact frame are reset. By optimizing the structure of the tripping mechanism, parts such as a jump pin and a swing piece in the prior art are reduced, the actions that the jump pin pushes the tripping piece to move and the tripping piece and the swing piece move in a linkage mode are correspondingly reduced, the action process is simplified, the reliability during opening and closing movement is improved, the occupied space is small, parts needing to be assembled are reduced, and the cost is reduced. The assembly efficiency is improved, the production cost is reduced, the product is reliable and stable, the overall size is small, and the assembly efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a miniature circuit breaker. Background Art

[0002] A circuit breaker is a mechanical switch that can connect, carry and disconnect current under normal circuit conditions, and can also connect, carry for a certain time and disconnect current under specified abnormal circuit conditions. A circuit breaker is an important component in electrical primary equipment. A circuit breaker is generally composed of a contact system, an arc extinguishing system, an operating mechanism, a trip unit, and a housing.

[0003] The existing tripping mechanism uses multiple components to cooperate with each other to achieve closing / opening, which not only has a complex structure and low reliability, but also occupies a large space, making it impossible to miniaturize the miniature circuit breaker. In addition, there are many assembled parts, low assembly efficiency and high production cost. Therefore, the applicant has made a useful design and found a solution to the above problems. The technical solution to be introduced below was produced in this context. Summary of the invention

[0004] The purpose of the utility model is to overcome the shortcomings of the above-mentioned traditional tripping mechanism design and provide a product that is reliable and stable, has a small overall volume, and improves assembly efficiency.

[0005] To solve the above problems, the utility model adopts the following technical solutions.

[0006] A miniature circuit breaker comprises a base, wherein a handle, a tripping piece and a contact frame are arranged in the base, wherein the handle is linked to the contact frame and is used to push the contact frame and the tripping piece to rotate and move; when closing the circuit, the handle is rotated to form a locking holding point between the handle and the contact frame; the tripping piece is used to disintegrate the locking holding point to reset the tripping piece and the contact frame.

[0007] Preferably, the contact frame is provided with a movable contact frame, and is connected and fixed to the contact frame by injection molding. The contact frame is provided with a cylinder, and the cylinder is provided with a fixing groove. One side of the contact frame is provided with an indicating surface. The contact frame is provided with a locking groove and an unlocking groove, which are connected to each other, and the locking groove is provided with a pressure-bearing surface.

[0008] Preferably, the handle is provided with a connecting rod, and the connecting rod is slidably arranged in any one of the locking groove and the unlocking groove.

[0009] Preferably, the release member is provided with a release portion and a disassembly portion, the disassembly portion is arranged below the connecting rod, and the release member is provided with an indicator column.

[0010] Preferably, the moving contact frame is electrically connected to the bimetallic strip via a flexible connecting wire, and the moving contact frame is located on the travel track of the tripping part.

[0011] Preferably, the base is further provided with a support rod, a pin shaft, and connection terminals arranged on both sides of the base, and one of the connection terminals is provided with a bimetallic strip.

[0012] Preferably, the support rod is provided with a tension spring and is connected to the contact frame so that the connected portion faces the support rod. The cylinder is provided with a torsion spring, one end of which is arranged in a fixed groove, and the other end is located at the junction of a locking groove and an unlocking groove, so as to prevent the connecting rod from detaching from the locking groove.

[0013] Preferably, the bimetallic strip is provided with a pull rod and is linked to the release member.

[0014] Preferably, the release member and the contact frame are sequentially inserted into the pin shaft, or the contact frame and the release member are sequentially inserted into the pin shaft and are pivotally arranged on the pin shaft.

[0015] Beneficial effects:

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The utility model reduces the components such as the tripping button and the swinging part in the prior art by optimizing the structure of the tripping mechanism, and correspondingly reduces the action of the tripping button pushing the tripping part to move, and the linkage activity of the tripping part and the swinging part, thereby simplifying the action process and improving the reliability during the opening and closing movement. It also occupies a small space, reduces the components required for assembly, improves assembly efficiency, reduces production costs, overcomes the problems raised by the background technology, and enables the product to have the advantages of reliability and stability, small overall size, and improved assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front view of a first technical solution of a miniature circuit breaker of the utility model;

[0019] Figure 2 It is a rear view structural schematic diagram of a first technical solution of a miniature circuit breaker of the utility model;

[0020] Figure 3 An exploded diagram of a tripping mechanism of a first technical solution of a miniature circuit breaker of the utility model;

[0021] Figure 4 This is a front view of a second technical solution of a miniature circuit breaker of the utility model;

[0022] Figure 5 It is a rear view structural schematic diagram of a second technical solution of a miniature circuit breaker of the utility model;

[0023] Figure 6 An exploded diagram of a tripping mechanism of a second technical solution of a miniature circuit breaker of the utility model;

[0024] The corresponding relationship between the illustrations and component names in the figure is as follows:

[0025] Reference numerals: 1, base; 2, handle; 3, release member; 4, contact frame; 5, support rod; 6, pin shaft; 7, terminal; 8, static contact frame; 9, first torsion spring; 9.1, electromagnetic release;

[0026] 21. Connecting rod;

[0027] 31. Tripping part; 32. Disassembly part; 33. Indicator column;

[0028] 41. Moving contact frame; 42. Cylinder; 43. Indicating surface; 44. Locking groove; 45. Unlocking groove; 46. Flexible connecting wire; 47. Torsion spring;

[0029] 421, fixed slot;

[0030] 441, pressure-bearing surface;

[0031] 51. Extension spring;

[0032] 71. Bimetallic strip; 72. Pull rod. DETAILED DESCRIPTION

[0033] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left" and "right" are based on the directions or positional relationships shown in the accompanying 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0035] Reference example Figures 1 to 6 A miniature circuit breaker includes a base 1, in which a handle 2, a tripping member 3, and a contact frame 4 are arranged. The handle 2 is linked to the contact frame 4 and is used to push the contact frame 4 and the tripping member 3 to rotate. When the switch is closed, the handle 2 is rotated to form a locking holding point between the handle 2 and the contact frame 4. The tripping member 3 is used to disintegrate the locking holding point to reset the tripping member 3 and the contact frame 4.

[0036] It is worth mentioning that the contact frame 4 is provided with a moving contact frame 41, and is connected and fixed to the contact frame 4 by injection molding. The contact frame 4 is provided with a cylinder 42, and the cylinder 42 is provided with a fixing groove 421. One side of the contact frame 4 is provided with an indicating surface 43. The contact frame 4 is provided with a locking groove 44 and an unlocking groove 45, which are connected to each other. The locking groove 44 is provided with a pressure-bearing surface 441. The moving contact frame 41 plays a role in transmitting current, and the fixing groove 421 plays a role in fixing the torsion spring 47. The indicating surface 43 is divided into two, red and green respectively. When the circuit breaker is closed, the red color is in the observation hole of the circuit breaker housing, and when the circuit breaker is opened, the green color is in the observation hole of the circuit breaker housing, so that the user can know whether the tripping mechanism of the circuit breaker is opened or closed. The pressure-bearing surface 441 mainly bears the driving force from the connecting rod 21.

[0037] It is worth mentioning that the handle 2 is provided with a connecting rod 21, which is slidably arranged in any one of the locking grooves 44 and the unlocking grooves 45. By rotating the handle 2, the driving force is transmitted to the tripping member 3 and the contact frame 4 through the connecting rod 21, so that the tripping member 3 and the contact frame 4 rotate.

[0038] It is worth mentioning that the tripping member 3 is provided with a tripping portion 31 and a disassembling portion 32. The disassembling portion 32 is arranged below the connecting rod 21. The tripping member 3 is provided with an indicating column 33. The tripping portion 31 is used in conjunction with the electromagnetic tripping device 9.1 in the circuit breaker. The disassembling portion 32 is used to push the connecting rod 21 into the unlocking groove 45. When the circuit breaker is opened or closed, the rotation of the tripping member 3 causes the indicating column 33 to move at the peephole of the circuit breaker housing, so that the user can know whether the tripping mechanism of the circuit breaker is opened or closed.

[0039] It is worth mentioning that the moving contact frame 41 is electrically connected to the bimetallic strip 71 through the flexible connecting wire 46. The moving contact frame 41 is located on the travel track of the tripping part 31. When the circuit is closed, the current in the circuit is transmitted to the bimetallic strip 71, the flexible connecting wire 46, the moving contact frame 41 through the wiring terminal 7, and then to the static contact frame 8, so that the circuit between the wiring terminals 7 at both ends of the circuit breaker is turned on.

[0040] It is worth mentioning that the support rod 5 is provided with a tension spring 51 and is connected to the contact frame 4 or the release member 3 so that the connected part faces the support rod 5. The cylinder 42 is provided with a torsion spring 47. One end of the torsion spring 47 is arranged in the fixed groove 421, and the other end is located at the junction of the locking groove 44 and the unlocking groove 45, which is used to prevent the connecting rod 21 from being separated from the locking groove 44. When the switch is opened, the tension spring 51 accelerates the moving contact frame 41 to separate the static contact frame 8 in the base 1, so that the arc length increases rapidly, thereby accelerating the arc extinction speed. The torsion spring 47 makes the connecting rod 21 in the locking groove 44 after the movement, preparing for the next closing.

[0041] It is worth mentioning that the bimetallic strip 71 is provided with a pull rod 72 and is linked to the release member 3, and the pull rod 72 is used in conjunction with the bimetallic strip 71;

[0042] It is worth mentioning that the tripping member 3 and the contact frame 4 are sequentially inserted in the pin shaft 6 or the contact frame 4 and the tripping member 3 are sequentially inserted in the pin shaft 6 and pivotally arranged on the pin shaft 6. The utility model has two sets of technical solutions. When the tripping member 3 and the contact frame 4 are sequentially inserted in the pin shaft 6, the tension spring 51 is connected to the contact frame 4 located above the tripping member 3. It is the first set of technical solutions. Figure 1 , 2 , 3; when the contact frame 4, the release member 3 is sequentially inserted in the pin 6, the tension spring 51 is connected to the contact frame 4 located below the release member 3 as the second set of technical solutions, refer to the attached Figure 4 , 5 , as shown in Figure 6.

[0043] Since the operating principles of the first set of technical solutions and the second set of technical solutions are the same, the use principles of the first set of technical solutions and the second set of technical solutions of the utility model are described as follows:

[0044] Example 1

[0045] Applying pressure to the handle 2 to rotate it causes the first torsion spring 9 in the handle 2 to store energy. The driving force causes the connecting rod 21 to move and abut against the pressure-bearing surface 441, thereby pushing the contact frame 4 and the release member 3 to move synchronously around the pin shaft 6. The tension spring 51 is pulled by the contact frame 4 and stores energy. When the moving contact frame 41 abuts against the static contact frame 8 in the circuit breaker, the rotation angle of the handle 2 exceeds the critical point of the locking state, causing the first torsion spring 9 to store energy and the connecting rod 21 to be pressed against the pressure-bearing surface 441, thereby forming a locking holding point between the contact frame 4 and the contact frame 4. The pulling force of the tension spring 51 pulling the contact frame 4 is overcome, so that the release member 3 and the contact frame 4 are fixed in the position after the movement. The closing action is completed through the above-mentioned operation steps.

[0046] Example 2

[0047] When an opposite force is applied to push the handle 2 to reset it, the first torsion spring 9 releases its elastic force to the handle 2, causing the connecting rod 21 to leave the pressure-bearing surface 441 and pull the contact frame 4 to reset. The elastic force released by the tension spring 51 accelerates the moving contact frame 41 to leave the static contact frame 8, increasing the opening speed and thus completing the opening action.

[0048] Example 3

[0049] When a short circuit occurs in the circuit connected to the circuit breaker, the current exceeds the normal current by several times, but the occurrence time is short, generally in milliseconds. The electromagnetic force generated by the electromagnetic release 9.1 in the base 1 is greater than the reaction force of the spring, pushing the moving iron core to extend quickly and push the release part 31 to move. The release part 31 pushes the moving contact frame 41 to reset, and then drives the moving contact frame 41 to reset. At the same time, the disassembly part 32 pushes the connecting rod 21 to leave the locking groove 44. Due to the inertia of the connecting rod 21, the connecting rod 21 pushes the locking groove 44. One end of the torsion spring 47 stores energy in the torsion spring 47, and enters the unlocking groove 45 and travels a certain distance. At this time, the locking holding point between the connecting rod 21 and the pressure-bearing surface 441 is disintegrated, and the first torsion spring 9 and the tension spring 51 in the handle 2 release the elastic force, accelerating the moving contact frame 41 to leave the static contact frame 8, thereby completing the protection of the line. When the tripping member 3 and the contact frame 4 are reset, the elastic force released by the torsion spring 47 pulls the connecting rod 21 back into the locking groove 44 to prepare for the next closing.

[0050] Example 4

[0051] When an overload occurs, the current gradually increases, and the overload duration is in seconds. The electromagnetic release 9.1 will not trip, but the overload causes the bimetallic strip 71 to be bent by heat and bend in the opposite direction of the static contact frame 8. The pull rod 72 pulls the tripping member 3 to move in the reset direction, and the tripping portion 31 abuts against the contact frame 4 and pushes it to reset. At the same time, the disintegration portion 32 lifts the connecting rod 21 to make it leave the locking groove 44. Due to the inertia of the connecting rod 21, one end of the torsion spring 47 is pushed open, so that the torsion spring 47 accumulates energy and enters the unlocking groove 45 and travels a distance. At this time, the locking holding point between the connecting rod 21 and the pressure surface 441 is disintegrated, and the first torsion spring 9 and the tension spring 51 in the handle 2 release the elastic force, accelerating the moving contact frame 41 to leave the static contact frame 8, thereby completing the protection of the line. When the tripping member 3 and the contact frame 4 are reset, the elastic force released by the torsion spring 47 pulls the connecting rod 21 back into the locking groove 44 to prepare for the next closing.

[0052] The above design scheme can make the product reliable and stable, with small overall volume and improved assembly efficiency.

[0053] The above content is a further detailed description of the utility model in combination with specific implementation methods. It cannot be determined that the specific implementation of the utility model is limited to these descriptions. For ordinary technicians in the technical field to which the utility model belongs, without departing from the concept of the utility model, they can also make several simple deductions or substitutions, which should be regarded as belonging to the scope of protection determined by the claims submitted for the utility model.

Claims

1. A miniature circuit breaker, comprising a base (1), wherein a handle (2), a tripping member (3), and a contact frame (4) are arranged in the base (1), characterized in that: The handle (2) is linked to the contact frame (4) and is used to push the contact frame (4) and the release member (3) to rotate; when the switch is closed, the handle (2) is rotated to form a locking holding point between the handle (2) and the contact frame (4); the release member (3) is used to disintegrate the locking holding point to reset the release member (3) and the contact frame (4).

2. The miniature circuit breaker according to claim 1, characterized in that: The contact frame (4) is provided with a movable contact frame (41) and is connected and fixed to the contact frame (4) by injection molding. The contact frame is provided with a cylinder (42), and the cylinder (42) is provided with a fixing groove (421). One side of the contact frame (4) is provided with an indicating surface (43). The contact frame (4) is provided with a locking groove (44) and an unlocking groove (45), which are connected to each other, and the locking groove (44) is provided with a pressure-bearing surface (441).

3. The miniature circuit breaker according to claim 2, characterized in that: The handle (2) is provided with a connecting rod (21), and the connecting rod (21) is slidably arranged in any one of the locking groove (44) and the unlocking groove (45).

4. The miniature circuit breaker according to claim 3, characterized in that: The release member (3) is provided with a release portion (31) and a disassembly portion (32); the disassembly portion (32) is arranged below the connecting rod (21); and the release member (3) is provided with an indication column (33).

5. The miniature circuit breaker according to claim 4, characterized in that: The base (1) is also provided with a support rod (5), a pin shaft (6), and connection terminals (7) arranged on both sides of the base (1), one of the connection terminals (7) being provided with a bimetallic strip (71).

6. The miniature circuit breaker according to claim 5, characterized in that: The movable contact frame (41) is electrically connected to the bimetallic strip (71) via a flexible connecting wire (46), and the movable contact frame (41) is located on a travel track of the tripping portion (31).

7. The miniature circuit breaker according to claim 6, characterized in that: The support rod (5) is provided with a tension spring (51) and is connected to the contact frame (4) so ​​that the connected portion faces the support rod (5). The cylinder (42) is provided with a torsion spring (47). One end of the torsion spring (47) is arranged in the fixing groove (421), and the other end is located at the junction of the locking groove (44) and the unlocking groove (45), so as to prevent the connecting rod (21) from escaping from the locking groove (44).

8. The miniature circuit breaker according to claim 7, characterized in that: The bimetallic strip (71) is provided with a pull rod (72) and is linked to the release member (3).

9. The miniature circuit breaker according to claim 8, characterized in that: The release member (3) and the contact frame (4) are inserted into the pin shaft (6) in sequence, or the contact frame (4) and the release member (3) are inserted into the pin shaft (6) in sequence and are pivotally arranged on the pin shaft (6).

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