Circuit breaker cut-off mechanism

Abstract

The utility model relates to the technical field of circuit breakers, and discloses a circuit breaker cut-off mechanism which is used for solving the problem that after a circuit breaker fixing rod deforms, the movement amount is reduced when a push rod impacts the fixing rod. A first gear and a second gear are arranged in a shell, and column teeth are arranged on a push rod and meshed with the first gear; a sliding block, an extrusion block and a third gear are arranged in the sliding groove of the mounting block, upper teeth and lower teeth are arranged on the sliding block, side teeth are arranged on the extrusion block, the upper teeth and the side teeth are meshed with the third gear, and the lower teeth are meshed with the second gear; during closing, an opening and closing button of the cutting device is pushed, a transmission structure works, a supporting rod drives a hook and a fixing rod to move towards a mounting block, a sliding block is squeezed, upper teeth on the sliding block drive a third gear to rotate, side teeth and the squeezing block move downwards, the squeezing block downwards presses the fixing rod, the fixing rod is tightly attached to the mounting block, and the fixing rod is prevented from being damaged after deformation. And the distance between the fixed rod and the top end of the push rod is increased, so that the phenomenon that the circuit breaker cannot be disconnected is avoided.

Description

Technical Field

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

[0002] A circuit breaker is a switch device that can close, carry and disconnect current under normal circuit conditions and close, carry and disconnect current under abnormal circuit conditions within a specified time. Circuit breakers can be divided into miniature circuit breakers, molded case circuit breakers and frame circuit breakers according to the current size. Among them, miniature circuit breakers are commonly used circuit breakers in households.

[0003] When the miniature circuit breaker is short-circuited, a large current passes through the coil. The magnetic field generated by the coil overcomes the reaction spring, and the push rod instantly hits the fixed rod of the release, causing the release to pull the operating mechanism to operate and the switch to trip instantly. After long-term use, the push rod hits the fixed rod of the release more times, and the fixed rod may be bent and deformed. In the subsequent use process, the displacement of the push rod remains unchanged, and the amplitude of the push rod hitting the fixed rod of the release is weakened. At this time, the circuit breaker may not be disconnected, thereby affecting the use effect of the circuit breaker. Utility Model Content

[0004] The present application proposes a circuit breaker disconnection mechanism, which has the advantage of preventing the circuit from being unable to be disconnected after the circuit breaker fixing rod is deformed, and is used to solve the problem of reduced movement when the pushing rod hits the fixing rod after the circuit breaker fixing rod is deformed.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: a circuit breaker cutting mechanism, including a shell, a metal sheet, an arc extinguishing chamber, a cutting device, a mounting block and a connector, the cutting device including a mounting shell, a push rod and a transmission structure, the transmission structure including an opening and closing button, a connecting hook, a support rod, a hook and a fixing rod, the mounting shell is provided with: a support column, fixedly arranged on the shell between the mounting shell and the mounting block; a first gear, movably sleeved on the support column close to the push rod; a second gear, movably sleeved on the support column away from the push rod, the first gear meshing with the second gear; a column tooth, fixedly arranged on the top end of the side wall of the push rod, the column tooth meshing with the first gear.

[0006] Furthermore, the mounting block is provided with: a slide groove, which is opened on one side of the mounting block close to the cutting device; a slider, which is movably arranged at the bottom end of the slide groove, a plurality of upper teeth are fixedly arranged on the top end of the slider, and a plurality of lower teeth are fixedly arranged on the bottom end of the slider, and the lower teeth pass through the mounting block and mesh with the second gear; a third gear, which is movably arranged at the upper end of the slide groove and meshes with the upper teeth on the slider; an extrusion block, which is slidably arranged on one side of the slide groove close to the cutting device, and a plurality of side teeth are fixedly arranged on the inner side of the extrusion block, and the side teeth mesh with the third gear; an elastic rope, one end of which is fixedly connected to the top end of the extrusion block, and the other end of which is fixedly connected to the mounting block.

[0007] Furthermore, the sliding block can only move laterally in the sliding groove.

[0008] Furthermore, the extrusion block can only move longitudinally in the slide groove.

[0009] Furthermore, the elastic rope is always in a stretched state.

[0010] Furthermore, push rods are provided on both sides of the mounting block directly below the extrusion block, and connecting rods are connected to the positions of the push rods on both sides close to the mounting blocks. When closed, the connecting rods are close to below the fixed rods, and the top ends of the push rods are close to the bottom end of the extrusion block after closing, and the bottom ends of the push rods penetrate the mounting block and extend out; auxiliary strips are fixedly installed on both sides of the push rod, and the auxiliary strips are directly below the push rods.

[0011] Furthermore, a limiting ring is fixedly sleeved on the top rod at the bottom end of the extrusion block.

[0012] This application has the following beneficial effects:

[0013] 1. A circuit breaker cutting mechanism provided by the present application is characterized in that the two ends of the two supporting columns are fixedly arranged on the inner walls on both sides of the shell, the two supporting columns are movably sleeved with a first gear and a second gear, a push rod is fixedly provided with a column tooth close to one side of the supporting column, and the column tooth is meshed with the first gear; a mounting block is fixedly installed in the shell at the upper end of the arc extinguishing chamber, a slide groove is provided on the mounting block, a slider, an extrusion block and a third gear are arranged in the slide groove, upper teeth and lower teeth are respectively arranged on the upper and lower sides of the slider, side teeth are arranged on the inner side of the extrusion block, an elastic rope is fixedly connected to the top end of the third gear, and the other end of the elastic rope is fixedly connected to the mounting block, the upper teeth at the top end of the slider and the side teeth of the extrusion block are meshed with the third gear, and the lower teeth at the bottom end of the slider are meshed with the second gear When the breaker is closed, the opening and closing button of the cutting device is pushed to make the transmission structure work, so that the connecting hook is connected with the connector at the lower end. At the same time, the support rod drives the hook and the fixed rod to move toward the mounting block, so that the fixed rod squeezes the slider of the mounting block, thereby making the slider move into the slide groove, and the upper teeth on the moving slider drive the third gear to rotate, and the rotating third gear makes the side teeth and the extrusion block move downward, thereby making the extrusion block press the fixed rod downward, so that the fixed rod is close to the mounting block, to prevent the fixed rod from being deformed after being hit multiple times, and the distance between the bottom end of the fixed rod and the top end of the pushing rod becomes longer when disconnecting, thereby preventing the hook from being unhooked from the support rod when the upward moving distance of the pushing rod remains unchanged, and avoiding the phenomenon that the circuit breaker cannot be disconnected.

[0014] 2. A circuit breaker cutting mechanism provided by the present application comprises a push rod penetrating through the mounting block at the bottom end of the extrusion block, the top end of the push rod being close to the bottom end of the extrusion block after closing, and the bottom end of the push rod penetrating through the mounting block and extending out; auxiliary bars are fixedly mounted on both sides of the push rod, and the auxiliary bars are located directly below the push rod; when a short circuit occurs in the circuit, the current in the circuit increases sharply, at this time, the coil generates a larger magnetic field, so that the column overcomes the elastic force of the spring in the piston cylinder and moves upward, the column drives the push rod to move upward, the push rod hits the fixed rod, the hook is disengaged, the transmission structure of the cutting device moves, thereby disconnecting the connection between the connecting hook and the lower connector, while the push rod moves upward, the push rod drives the auxiliary bar to move upward, the auxiliary bar pushes the push rod to move upward, the upwardly moved push rod drives the extrusion block to move upward, so that the side teeth of the extrusion block drive the third gear to rotate, so that the third gear drives the slider to move, the lower teeth on the slider rotate the second gear and the first gear, at the same time, the first gear drives the column teeth to move upward, so that the column teeth drive the push rod to move upward, thereby the auxiliary push rod hits the fixed rod, and the circuit breaker is disconnected. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which constitute a part of the specification, illustrate embodiments disclosed in the present application and, together with the description, serve to explain the principles disclosed in the present application.

[0016] The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the cutting device and the mounting block of the utility model;

[0020] Figure 4 This is a schematic diagram of the internal structure of the cutting device and the mounting block of the utility model;

[0021] Figure 5 This is a cross-sectional view of the cutting device and the mounting block of the utility model.

[0022] In the figure: 1. shell; 2. metal sheet; 3. arc extinguishing chamber; 4. cutting device; 401. mounting shell; 402. piston cylinder; 403. column; 404. push rod; 405. coil; 407. connecting hook; 408. support rod; 409. hook; 410. fixing rod; 411. support column; 412. first gear; 413. second gear; 414. column tooth; 415. auxiliary strip; 5. mounting block; 501. slide groove; 502. slider; 503. upper tooth; 504. lower tooth; 505. extrusion block; 506. side tooth; 507. third gear; 508. elastic rope; 509. top rod; 6. connector. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] See also Figure 1-Figure 2 A circuit breaker cutting mechanism comprises a shell 1, a metal sheet 2, an arc extinguishing chamber 3, a cutting device 4, a mounting block 5 and a connector 6. The connectors 6 are fixedly mounted on the top and bottom of the shell 1 respectively, and the metal sheet 2 is fixedly mounted below the connector 6 at the top of the shell 1. The metal sheet 2 is electrically connected to the connector 6 at the upper end, and the mounting block 5 is fixedly mounted on the bottom of the metal sheet 2. The arc extinguishing chamber 3 is fixedly mounted directly below the mounting block 5. The arc extinguishing chamber 3 is electrically connected to the connector 6 below, and the cutting device 4 is fixedly mounted in the shell 1 on one side of the arc extinguishing chamber 3.

[0025] See also Figure 2-Figure 5The cutting device 4 includes a mounting shell 401 and a transmission structure. The mounting shell 401 is fixedly mounted on the housing 1. A vertically arranged piston cylinder 402 is fixedly mounted in the mounting shell 401. A spring is arranged above the piston cylinder 402. A column 403 is arranged below the piston cylinder 402. The top of the column 403 is closely attached to the bottom of the spring, and the bottom end of the column 403 extends out of the mounting shell 401. A push rod 404 is fixedly mounted on the top of the column 403. The push rod 404 is in the spring, and the top end of the push rod 404 extends out of the housing 1. A coil 405 is fixedly sleeved on the outside of the piston cylinder 402, and one end of the coil 405 is electrically connected to the metal sheet 2. The dynamic structure includes an opening and closing button, a connecting hook 407, a support rod 408, a hook 409 and a fixed rod 410. One end of the connecting hook 407 and the support rod 408 are hinged to the bottom end of the mounting shell 401 at the same position. The connecting hook 407 is fixedly connected to the support rod 408. One end of the connecting hook 407 is electrically connected to the other end of the coil 405. The middle position of the connecting hook 407 is clamped on the lower side wall of the column 403. The hook 409 is buckled on the top of the support rod 408. The hook 409 is fixedly connected to the fixed rod 410 on one side close to the arc extinguishing chamber 3. The fixed rod 410 extends into the side wall of the mounting block 5. The opening and closing button of the cutting device 4 passes through and extends out of the shell 1.

[0026] See also Figure 1-Figure 5 Two support columns 411 are fixedly provided on the shell body 1 between the mounting shell 401 and the mounting block 5. The support columns 411 and the push rod 404 are perpendicular to each other. A first gear 412 is movably sleeved on the support column 411 close to the push rod 404, and a second gear 413 is movably sleeved on the support column 411 away from the push rod 404. The first gear 412 is meshed with the second gear 413. A plurality of column teeth 414 are fixedly provided above the push rod 404 extending out of the mounting shell 401, and the column teeth 414 are meshed with the first gear 412; a slide groove 501 is provided on one side of the mounting block 5 close to the cutting device 4, and a slider 502 is movably provided at the bottom end of the slide groove 501. The slider 502 can only move laterally in the slide groove 501. A plurality of upper teeth 503 are fixedly provided at the top of 502, a plurality of lower teeth 504 are fixedly provided at the bottom of the slider 502, the lower teeth 504 pass through the mounting block 5, and the lower teeth 504 are meshed with the second gear 413, a third gear 507 is movably provided at the upper end in the slide groove 501, the third gear 507 is meshed with the upper teeth 503 on the slider 502, an extrusion block 505 is slidably provided on one side of the slide groove 501 close to the cutting device 4, the extrusion block 505 can only move longitudinally in the slide groove 501, a plurality of side teeth 506 are fixedly provided on the inner side of the extrusion block 505, the side teeth 506 are meshed with the third gear 507, an elastic rope 508 is fixedly connected to the top of the extrusion block 505, and the upper end of the elastic rope 508 is fixedly connected to the mounting block 5.

[0027] The elastic rope 508 is always in a stretched state. The elastic rope 508 always generates a tensile force on the extrusion block 505, so that the extrusion block 505 has a force to move upward, ensuring that the extrusion block 505 does not move downward and hinder the fixing rod 410 from squeezing the slider 502.

[0028] See also Figure 2-Figure 5 , push rods 509 are penetrated on both sides of the mounting block 5 directly below the extrusion block 505, and the push rods 509 can move up and down. The push rods 509 on both sides are connected with connecting rods close to the mounting block 5. When closed, the connecting rods are close to below the fixed rod 410, and the top of the push rod 509 is close to the bottom end of the extrusion block 505 after closing, and the bottom end of the push rod 509 penetrates the mounting block 5 and extends out; auxiliary strips 415 are fixedly installed on both sides of the push rod 404, and the auxiliary strips 415 are directly below the push rod 509.

[0029] A limiting ring is fixedly sleeved on the push rod 509 at the bottom of the extrusion block 505 to prevent the push rod 509 from sliding off the mounting block 5, to limit the position of the push rod 509, and to prevent the push rod 509 from moving and affecting the pushing operation of the push rod 509 on the extrusion block 505.

[0030] The working principle of the utility model is as follows:

[0031] See also Figure 1-Figure 5 When the circuit breaker is closed, the opening and closing button of the disconnecting device 4 is pushed, and the transmission structure works, so that the connecting hook 407 is connected with the connector 6 at the lower end. At the same time, the support rod 408 drives the hook 409 and the fixed rod 410 to move toward the mounting block 5, so that the fixed rod 410 squeezes the slider 502 of the mounting block 5, so that the slider 502 moves into the slide groove 501, and the upper teeth 503 on the moving slider 502 drive the third gear 507 to rotate, and the rotating third gear 507 makes the side teeth 506 and the squeezing block 505 move downward, so that the squeezing block 505 presses the fixed rod 410 downward, so that the fixed rod 410 is close to the mounting block 5, to prevent the fixed rod 410 from being deformed after being hit multiple times, and the distance between the bottom end of the fixed rod 410 and the top end of the push rod 404 becomes longer when disconnecting, thereby preventing the hook 409 from being unhooked from the support rod 408 when the upward moving distance of the push rod 404 remains unchanged, and avoiding the phenomenon that the circuit breaker cannot be disconnected;

[0032] When a short circuit occurs in the circuit, the current in the circuit increases sharply. At this time, the coil 405 generates a larger magnetic field, causing the column 403 to overcome the elastic force of the spring in the piston cylinder 402 and move upward. The column 403 drives the push rod 404 to move upward, and the push rod 404 hits the fixed rod 410, so that the hook 409 is disengaged, and the transmission structure of the cutting device 4 moves, thereby disconnecting the connection between the connecting hook 407 and the lower connector 6, and the hook 409 and the fixed rod 410 are reset (existing working method). In this process, the column teeth 414 on the upward pushing rod 404 push the first gear 412 and the second gear 413 to rotate, and the rotating second gear 413 pushes the slider 502 to move out of the slide groove 501. At the same time, the upper teeth 503 of the slider 502 push the third gear 507 to rotate, and the third gear 507 drives the side teeth 506 and the extrusion block 505 to move upward, so that the extrusion block 505 releases the limit on the fixed rod 410.

[0033] See also Figure 1-Figure 5 When a short circuit occurs in the circuit, the current in the circuit increases sharply. At this time, the coil 405 generates a large magnetic field, causing the column 403 to overcome the elastic force of the spring in the piston cylinder 402 and move upward. The column 403 drives the push rod 404 to move upward, and the push rod 404 hits the fixed rod 410, so that the hook 409 is disengaged, and the transmission structure of the cutting device 4 moves, thereby disconnecting the connection hook 407 from the lower connector 6. When the push rod 404 moves upward, the push rod 404 drives the auxiliary bar 415 to move upward, and the auxiliary bar 415 contacts the top rod. After the push rod 509 is pushed upward, the upward push rod 509 pushes the extrusion block 505 upward, so that the side teeth 506 of the extrusion block 505 drive the third gear 507 to rotate, so that the third gear 507 drives the slider 502 to move, and the lower teeth 504 on the slider 502 rotate the second gear 413 and the first gear 412. At the same time, the first gear 412 drives the column teeth 414 to move upward, so that the column teeth 414 drives the push rod 404 to move upward, thereby assisting the push rod 404 to hit the fixed rod 410, and realizing the disconnection of the circuit breaker;

[0034] At the same time, when the push rod 404 hits the fixed rod 410 and fails to disconnect the circuit, the upward push rod 404 drives the auxiliary bar 415 upward, and the auxiliary bar 415 contacts the top rod 509 and pushes the top rod 509 upward, and the upward top rod 509 drives the connecting rod upward, and the connecting rod pushes the fixed rod 410 upward, so that the hook 409 connected to the fixed rod 410 is completely unhooked, and the transmission structure of the disconnection device 4 is moved to complete the circuit disconnection operation. Through this process, another disconnection structure is added to prevent the phenomenon of failure to disconnect when a short circuit occurs.

Claims

1. A circuit breaker disconnection mechanism, comprising a housing (1), a metal sheet (2), an arc extinguishing chamber (3), a disconnection device (4), a mounting block (5) and a connector (6), wherein the disconnection device (4) comprises a mounting housing (401), a push rod (404) and a transmission structure, wherein the transmission structure comprises an opening and closing button, a connecting hook (407), a supporting rod (408), a hook (409) and a fixing rod (410), characterized in that: The installation shell (401) is provided with: A support column (411) is fixedly arranged on the housing (1) between the mounting shell (401) and the mounting block (5); A first gear (412) is movably sleeved on a support column (411) that is closely attached to the push rod (404); A second gear (413) is movably sleeved on a support column (411) away from the push rod (404), and the first gear (412) is meshed with the second gear (413); The column tooth (414) is fixedly arranged on the top end of the side wall of the push rod (404), and the column tooth (414) is meshed with the first gear (412).

2. A circuit breaker disconnection mechanism according to claim 1, characterized in that: The mounting block (5) is provided with: A slide groove (501) is provided on a side of the mounting block (5) close to the cutting device (4); A slider (502) is movably disposed at the bottom end of the slide groove (501), a plurality of upper teeth (503) being fixedly disposed at the top end of the slider (502), a plurality of lower teeth (504) being fixedly disposed at the bottom end of the slider (502), the lower teeth (504) passing through the mounting block (5) and meshing with the second gear (413); A third gear (507) is movably disposed at the upper end of the slide groove (501) and meshes with the upper teeth (503) on the slider (502); An extrusion block (505) is slidably disposed on a side of the slide groove (501) close to the cutting device (4), and a plurality of side teeth (506) are fixedly disposed on the inner side of the extrusion block (505), and the side teeth (506) are meshed with the third gear (507); The elastic rope (508) has one end fixedly connected to the top of the extrusion block (505) and the other end fixedly connected to the mounting block (5).

3. A circuit breaker disconnection mechanism according to claim 2, characterized in that: The sliding block (502) can only move laterally in the sliding groove (501).

4. A circuit breaker disconnection mechanism according to claim 2, characterized in that: The extrusion block (505) can only move longitudinally in the slide groove (501).

5. A circuit breaker disconnection mechanism according to claim 2, characterized in that: The elastic rope (508) is always in a stretched state.

6. A circuit breaker disconnection mechanism according to claim 2, characterized in that: Push rods (509) are provided on both sides of the mounting block (5) directly below the extrusion block (505), and connecting rods are connected to the positions of the push rods (509) on both sides close to the mounting block (5). When closed, the connecting rods are located close to the bottom of the fixed rod (410), and the top end of the push rod (509) is close to the bottom end of the extrusion block (505) after closing, and the bottom end of the push rod (509) passes through the mounting block (5) and protrudes out; Auxiliary bars (415) are fixedly mounted on both sides of the push rod (404), and the auxiliary bars (415) are located directly below the top rod (509).

7. A circuit breaker disconnection mechanism according to claim 6, characterized in that: A limiting ring is fixedly sleeved on the top rod (509) at the bottom end of the extrusion block (505).

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