Over-current tripping mechanism and miniature circuit breaker

Abstract

The utility model relates to an overcurrent tripping mechanism and a miniature circuit breaker. The overcurrent tripping mechanism comprises a handle rotatably arranged in a shell; the linkage rod is rotatably arranged in the shell; the lock catch is rotatably arranged on the linkage rod, the lock catch is matched with the linkage rod to form a locking position, and the locking position can form an opening when the lock catch rotates relative to the linkage rod; one end of the U-shaped connecting rod is arranged in the locking position, and the other end of the U-shaped connecting rod is linked with the handle; the current release is arranged in the shell; and the overcurrent tripping rod is arranged in the shell in a sliding manner and is positioned between the lock catch and the ejector rod of the current tripper. The gap between the moving contact and the shell is used for accommodating the over-current tripping rod capable of relatively sliding, the movable characteristic of the over-current tripping rod is used for realizing the action transmission of the current tripper, the useless space between the original moving contact and the shell is utilized, although one piece is added, the internal space cannot be wasted, and the service life of the current tripper is prolonged. And the space utilization improvement of the novel layout can be met.

Description

Technical Field

[0001] The utility model specifically relates to an overcurrent tripping mechanism and a small circuit breaker. Background Art

[0002] A miniature circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions, and closing, carrying, and interrupting current under abnormal circuit conditions within a specified time. It is used to prevent accidents caused by equipment overload or failure. Circuit breakers can be operated manually or automatically open when the current exceeds a predetermined value.

[0003] However, due to the small internal space of the small circuit breaker, the overcurrent release is often placed close to the operating mechanism, so that the current release can directly act on the lock to achieve overcurrent protection. However, for some new layouts, the current release is often not installed near the operating mechanism, so a new overcurrent release mechanism is required. Utility Model Content

[0004] In view of the deficiencies in the prior art, the present invention aims to provide an overcurrent tripping mechanism and a miniature circuit breaker.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] An overcurrent tripping mechanism, comprising:

[0007] A handle rotatably disposed within the housing;

[0008] A linkage rod rotatably disposed within the housing;

[0009] A lock buckle rotatably provided on the linkage rod, wherein the lock buckle cooperates with the linkage rod to form a locked position, and the locked position can form an opening when the lock buckle rotates relative to the linkage rod;

[0010] A U-shaped connecting rod, one end of which is located in the locking position and the other end of which is linked to the handle;

[0011] a current release, disposed in the housing;

[0012] The overcurrent tripping rod is slidably arranged in the housing and is located between the lock and the top rod of the current tripper.

[0013] Two reinforcing ribs are arranged in the shell along the sliding direction of the overcurrent tripping rod, and a guide groove is formed between the two reinforcing ribs.

[0014] A guide block is provided in the guide groove, and a strip hole adapted to the guide block is provided on the overcurrent tripping rod.

[0015] The front end of the overcurrent tripping rod is set as a first linkage part that cooperates with the lock, and the rear end is set as a second linkage part that cooperates with the top rod of the current release, and the thickness of the second linkage part is greater than the thickness of the overcurrent tripping rod. The front end of the second linkage part is set as a third linkage part that cooperates with the moving contact.

[0016] The first linkage portion is arranged to be inclined upward.

[0017] The current release comprises:

[0018] The magnetic yoke is U-shaped and has a front end wall, a rear end wall and a connecting wall connecting the front end wall and the rear end wall;

[0019] The core assembly, whose front and rear ends are connected to the front wall and the rear wall respectively, includes:

[0020] An iron core casing with one end open;

[0021] A moving iron core disposed in an iron core casing;

[0022] A static iron core is arranged at the opening, and a movable cavity is formed between the static iron core and the movable iron core;

[0023] A push rod is slidably disposed in the movable cavity, and one end of the push rod passes through the static iron core;

[0024] A reset member is provided in the movable cavity;

[0025] A coil is wound around the outer periphery of the core assembly,

[0026] The outer wall of the core sleeve is provided with a limiting piece for forming a limiting cooperation with the rear end wall.

[0027] A small circuit breaker includes a housing, in which the above-mentioned overcurrent tripping mechanism and a moving contact are arranged. The moving contact is rotatably arranged in the housing and is linked with the linkage rod through a pull rod. The overcurrent tripping rod of the overcurrent tripping mechanism is placed in the gap between the moving contact and the housing.

[0028] The beneficial effects of the present invention are as follows: the present application adopts a new layout, and there is a certain distance between the current release and the operating mechanism inside it. Therefore, the present application utilizes the gap between the moving contact and the shell to accommodate the overcurrent release rod that can slide relatively, and utilizes its movable feature to realize the action transmission of the current release. It utilizes the original useless space between the moving contact and the shell. Although one part is added, it will not cause waste of the internal space, and can meet the improvement of space utilization of the new layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1This is a structural schematic diagram of the overcurrent tripping mechanism disclosed in the utility model applied in a housing.

[0030] Figure 2 for Figure 1 Enlarged schematic diagram of point A in the middle.

[0031] Figure 3 This is a structural diagram of the overcurrent tripping mechanism disclosed in the utility model.

[0032] Figure 4 This is a schematic diagram of the cooperation between the linkage rod and the lock buckle disclosed in the present utility model.

[0033] Figure 5 This is a structural schematic diagram of the overcurrent tripping rod disclosed in the utility model.

[0034] Figure 6 This is a structural diagram of the current release disclosed in the utility model.

[0035] Figure 7 This is a cross-sectional schematic diagram of the current release disclosed in the utility model. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0037] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) 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.

[0038] like Figure 1 、 Figure 2 and Figure 3 As shown, the utility model discloses an overcurrent tripping mechanism, which includes:

[0039] A handle 200 rotatably disposed within the housing 100;

[0040] A linkage rod 300 rotatably disposed within the housing 100;

[0041] A lock catch 400 rotatably provided on the linkage rod 300, wherein the lock catch 400 cooperates with the linkage rod 300 to form a locked position, and the locked position can form an opening when the lock catch 400 rotates relative to the linkage rod 300;

[0042] A U-shaped connecting rod 500, one end of which is located in the locking position and the other end of which is linked to the handle 200;

[0043] The current release 900 is arranged in the housing 100. The current release is designed to be far away from the lock, and a relatively independent moving contact is provided between the two. A certain gap is formed between the moving contact and the housing.

[0044] The overcurrent trip rod 1000 can be slidably arranged in the shell 100, and is located between the lock 400 and the top rod of the current trip 900. The overcurrent trip rod directly utilizes the gap between the moving contact and the shell, so that the action of the current trip can be transmitted to the lock and drive the lock to move.

[0045] The top rod of the current release cooperates with one end of the overcurrent trip rod. Its action will drive the overcurrent trip rod to slide relative to each other, so that the other end of the overcurrent trip rod touches the trigger part of the lock, thereby causing the U-shaped connecting rod to disengage from the locked position, completing the tripping and opening of the circuit breaker, thereby enabling it to have an overcurrent protection function.

[0046] like Figure 4 As shown, by utilizing the L-shaped groove provided on the upper end of the linkage rod, one end of the U-shaped linkage rod is embedded in the L-shaped groove, and the other end thereof is linked to the handle, and the movement of the handle will drive the U-shaped linkage rod to move in the L-shaped groove, and combined with the lock design that is rotatable relative to the linkage rod, when the lock is in the initial state, the torsion spring is used to give it counterclockwise rotation, and then the hook head 420 is used to enclose one end of the U-shaped linkage rod in the vertical groove 310 of the L-shaped groove, forming a locked position. At this time, the U-shaped linkage rod is restricted by both, and it supports the linkage rod. At the same time, the linkage rod pushes the contact through the pull rod, so that the moving contact is in contact with the static contact to complete the closing. Moreover, because the pull rod is approximately perpendicular to the moving contact, the moving contact can be maintained in the closed state at all times.

[0047] When the lock is impacted, it drives the lock to rotate clockwise. When it rotates to a certain angle, the hook head and the L-shaped groove open, revealing an opening. The U-shaped connecting rod will slide out of the opening and enter the horizontal groove 320. At this time, since the restriction of the U-shaped connecting rod on the linkage rod is released, the linkage rod rotates relatively, thereby driving the pull rod to move, releasing the restriction of the pull rod on the moving contact, and the moving contact quickly opens.

[0048] The housing is equipped with two reinforcing ribs 110 arranged along the sliding direction of the overcurrent trip rod 1000, with a guide groove formed between the two reinforcing ribs. The two guide grooves serve as sliding guides for the current trip rod, and the movable contact is pressed against the guide grooves, thereby cooperating with the guide grooves to install the overcurrent trip rod. The space between the intermediate housing and the movable contact is used to accommodate the overcurrent trip rod, which improves space utilization and further frees up space between the movable contact and the housing to facilitate the installation of other functional components.

[0049] The guide groove is provided with a guide block 120, and the overcurrent trip rod 1000 is provided with a strip hole 1300 adapted to the guide block. A guide block is also provided in the guide groove, and the guide block is placed in the guide hole, and the two form a sliding fit, which serves to limit the travel distance of the overcurrent trip rod.

[0050] like Figure 5 As shown, the front end of the overcurrent trip rod 1000 is set as a first linkage part 1100 that cooperates with the lock 400, and the rear end thereof is set as a second linkage part 1200 that cooperates with the top rod of the current trip 900, and the thickness of the second linkage part 1200 is greater than the thickness of the overcurrent trip rod 1000, and the front end of the second linkage part 1200 is set as a third linkage part 1400 that cooperates with the moving contact.

[0051] The moving contact is placed between the first linkage part and the third linkage part. During normal opening and closing, it will not be interfered with by the current trip rod. When the current trip assembly is actuated, the first linkage part will touch the trigger part 410 of the lock, thereby causing the lock to release the lock on the U-shaped connecting rod. At this time, the moving contact is opened because the pressure of the pull rod on it is released. When the fault is eliminated and closing is required, the moving contact is driven to close the circuit. At the same time, it will drive the second linkage part to operate, causing the overcurrent trip rod to reset.

[0052] The first linkage portion 1100 is tilted upward so that it can touch the lock when moving laterally, and can also play a role of avoidance, thereby further improving space utilization in a small-sized circuit breaker.

[0053] like Figure 6 and Figure 7 As shown, the current release 900 includes:

[0054] The magnetic yoke 910 is U-shaped and has a front end wall, a rear end wall, and a connecting wall connecting the front end wall and the rear end wall;

[0055] The core assembly 930, whose front and rear ends are connected to the front wall and the rear wall respectively, includes:

[0056] An iron core sleeve 931 with an open end;

[0057] A moving iron core 932 disposed in an iron core sleeve 931;

[0058] A static iron core 933 is provided at the opening, and a movable cavity is formed between the static iron core 933 and the movable iron core 932;

[0059] A push rod 934 is slidably disposed in the movable cavity, and one end of the push rod 934 passes through the static iron core 933;

[0060] A reset member is provided in the movable cavity;

[0061] The coil 920 is wound around the outer periphery of the core assembly 930.

[0062] The outer wall of the core sleeve 931 is provided with a limiting member 940 for forming a limiting cooperation with the rear end wall.

[0063] The core assembly is fixed by utilizing the cooperation between the outer wall of the core casing and the magnetic yoke. This fixing method fixes the core casing and the static core, so there is no need to fix the push rod and the moving core, avoiding the problem of eccentricity of the push rod when the push rod and the moving core need to be hammered and fixed in previous operations.

[0064] The present utility model also discloses a miniature circuit breaker, which includes a housing 100, in which the above-mentioned overcurrent tripping mechanism and a moving contact 800 are provided. The moving contact 800 is rotatably arranged in the housing 100, and is linked with the linkage rod 300 through a pull rod 700, and the overcurrent tripping rod 1000 of the overcurrent tripping mechanism is placed in the gap between the moving contact 800 and the housing 100.

[0065] The embodiments should not be regarded as limiting the present invention, but any improvements based on the spirit of the present invention should be within the scope of protection of the present invention.

Claims

1. An overcurrent tripping mechanism, characterized in that: It includes: A handle (200) rotatably disposed within the housing (100); A linkage rod (300) rotatably disposed within the housing (100); A lock catch (400) rotatably arranged on the linkage rod (300), wherein the lock catch (400) cooperates with the linkage rod (300) to form a locked position, and the locked position can form an opening when the lock catch (400) rotates relative to the linkage rod (300); A U-shaped connecting rod (500), one end of which is located in the locking position and the other end of which is linked to the handle (200); A current tripper (900) is arranged in the housing (100); An overcurrent tripping rod (1000) is slidably arranged in the housing (100) and is located between the lock (400) and the top rod of the current tripper (900).

2. The overcurrent tripping mechanism according to claim 1, characterized in that: Two reinforcing ribs (110) are provided in the housing and are arranged along the sliding direction of the overcurrent tripping rod (1000), and a guide groove is formed between the two reinforcing ribs.

3. The overcurrent tripping mechanism according to claim 2, characterized in that: A guide block (120) is provided in the guide groove, and a strip-shaped hole (1300) adapted to the guide block is provided on the overcurrent tripping rod (1000).

4. An overcurrent tripping mechanism according to claim 1, 2 or 3, characterized in that: The front end of the overcurrent tripping rod (1000) is provided as a first linkage part (1100) that forms a linkage with the lock catch (400), and the rear end thereof is provided as a second linkage part (1200) that forms a linkage with the top rod of the current tripper (900), wherein the thickness of the second linkage part (1200) is greater than that of the overcurrent tripping rod (1000), and the front end of the second linkage part (1200) is provided as a third linkage part (1400) that forms a linkage with the moving contact.

5. The overcurrent tripping mechanism according to claim 4, characterized in that: The first linkage portion (1100) is arranged tilted upward.

6. The overcurrent tripping mechanism according to claim 1, characterized in that: The current tripper (900) comprises: The magnetic yoke (910) is arranged in a U shape and has a front end wall, a rear end wall and a connecting wall connecting the two; The core assembly (930) has its front and rear ends connected to the front end wall and the rear end wall respectively, and comprises: An iron core casing (931) with an open end; A moving iron core (932) disposed in an iron core sleeve (931); A static iron core (933) is provided at the opening, and a movable cavity is formed between the static iron core (933) and the movable iron core (932); A push rod (934) is slidably disposed in the movable cavity, and one end of the push rod passes through the static iron core (933); A reset member is provided in the movable cavity; The coil (920) is wound around the outer periphery of the core assembly (930). The outer wall of the core sleeve (931) is provided with a limiting member (940) for forming a limiting fit with the rear end wall.

7. A miniature circuit breaker, characterized in that: It comprises a shell (100), wherein the overcurrent tripping mechanism and the moving contact (800) according to any one of claims 1 to 6 are provided in the shell (100), the moving contact (800) is rotatably arranged in the shell (100), and is linked with the linkage rod (300) through a pull rod (700), and the overcurrent tripping rod (1000) of the overcurrent tripping mechanism is placed in the gap between the moving contact (800) and the shell (100).

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