Tripping mechanism of residual-current circuit breaker

Abstract

The utility model discloses a tripping mechanism of a residual-current circuit breaker, the tripping mechanism of the residual-current circuit breaker comprises a base, a tripping mechanism rotatably connected in the base, and a handle rotatably connected in the base, the tripping mechanism comprises a swing member, a tripping block, a tripping frame and a contact support, one end of the tripping block is hinged to one end of the swing member, and the other end of the tripping block is hinged to the other end of the swing member. The tripping block is provided with a connecting rod and is connected to the handle, and the tripping frame is in linkage connection with the swing piece. According to the utility model, through the second abutting surface, the pre-abutting surface and the cylinder, the second torsion spring is installed in the base in advance, assembling of the tripping mechanism is facilitated, the contact support is movably connected to the swing member through the first torsion spring, the tripping frame is movably connected to the swing member through the transmission arm, and the tripping frame provides support for the tripping block. Therefore, the tripping mechanism is integrated, the time required for assembling is greatly reduced, and the product has the advantages of improving the assembling efficiency and reducing the manufacturing cost.

Description

Technical Field

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

[0002] A leakage circuit breaker is a switch device that can close, carry and interrupt the current under normal circuit conditions and can close, carry and interrupt the current under abnormal circuit conditions within a specified time. When there is leakage in the protected circuit or electric shock, as long as the leakage current reaches the designed action current value, the leakage electromagnetic release in the leakage circuit breaker will cause the circuit breaker to operate, thereby cutting off the power supply and playing a role in leakage and electric shock protection.

[0003] According to the authorization announcement number CN217902917U "A thickened surge backup protector", according to the instructions attached Figure 1 The two ends of the spring in the tripping mechanism respectively abut the side wall of the base and the tripping mechanism. The spring mainly plays a balancing role to ensure that the moving contact and the static contact are on the same center line. The moving contact fits more closely to the static contact, and the cover body is the second balancing support point for the tripping mechanism.

[0004] However, the applicant found that in the actual production process, the spring would cause the entire tripping mechanism to slightly protrude from the base. The vibration during movement would cause the entire tripping mechanism to separate from the base for a certain distance. Before entering the next process, the assembler would need to first perform the operation steps of pressing down and adjusting the tripping mechanism. At the same time, the assembly of the spring requires the mutual cooperation of the base and the tripping mechanism. The above-mentioned operation steps increase the overall assembly time of the product, thereby increasing the manufacturing cost. Therefore, the applicant has made a beneficial design and found a solution to the above-mentioned problem. The technical solution to be introduced below was produced in this context. Summary of the invention

[0005] The purpose of the utility model is to overcome the shortcomings of the design proposed in the above background technology and provide a product that improves assembly efficiency and reduces manufacturing costs.

[0006] To solve the above problems, the utility model adopts the following technical solutions.

[0007] A tripping mechanism of a leakage circuit breaker comprises a base, a tripping mechanism rotatably connected to the base, and a handle rotatably connected to the base, the tripping mechanism comprises a swinging piece, a tripping block, a tripping frame, and a contact bracket, one end of the tripping block is hinged to one end of the swinging piece and abuts against the tripping frame, the tripping block is provided with a connecting rod and connected to the handle, the tripping frame is linked to the swinging piece, the contact bracket is rotatably connected to the two side surfaces of the swinging piece, the contact bracket is provided with a first torsion spring and abuts against the contact bracket and the swinging piece respectively, and the base is provided with a second torsion spring and abuts against the swinging piece and the base respectively.

[0008] Preferably, the base is provided with a leakage detection device, an arc extinguishing device, an electromagnetic release, a third torsion spring, a fourth torsion spring, a first static contact frame, and a second static contact frame. Both ends of the base are provided with wiring terminals, one of which is provided with a bimetallic strip, and the other is electrically connected to the third torsion spring. The third torsion spring moves in conjunction with the torsion spring in the handle, and the bimetallic strip is provided with a pull rod and is inserted into the trip frame.

[0009] Preferably, the input end of the leakage detection device is electrically connected to the fourth torsion spring, the lead-out end of the leakage detection device is electrically connected to the second static contact frame and one end of the electromagnetic release respectively, the other end of the electromagnetic release is electrically connected to the first static contact frame, and the arc extinguishing device is located below the contacts of the first static contact frame and the second static contact frame.

[0010] Preferably, the swing member is provided with a first abutting surface, first pressure-bearing portions are provided on both sides of the swing member, the swing member is provided with an indicating surface, and top surfaces are provided on both side surfaces of the swing member.

[0011] Preferably, the base is provided with a limiting plate, the limiting plate is provided with a second abutting surface and a pre-abutting surface, the pre-abutting surface is flush with the first abutting surface, and the base is further provided with a second cylinder.

[0012] Preferably, the contact bracket is provided with a moving contact bracket, and is electrically connected to the bimetallic strip through a flexible connecting wire. The moving contact bracket is connected and fixed to the contact bracket through injection molding. The contact bracket is provided with a second pressure-bearing portion. The contact bracket is provided with a first cylinder, and a pin shaft is inserted into the first cylinder, which passes through the swinging piece and abuts the base.

[0013] Preferably, the first torsion spring is arranged on the outer wall of the first cylinder and respectively abuts against the first pressure-bearing part and the second pressure-bearing part, so that the contact bracket abuts against the top surface; the second torsion spring is arranged on the outer wall of the second cylinder and respectively abuts against the first abutting surface and the pre-abutting surface, so that the swinging member abuts against the limiting plate.

[0014] Preferably, the trip frame is arranged between the contact brackets, and is provided with a trip portion and a first pressing surface. The trip portion is located on the motion trajectory of the moving iron core of the electromagnetic releaser. A transmission arm is provided on one side of the trip frame and is connected and fixed to the swing member.

[0015] Preferably, the jump buckle block is provided with a second buckling surface which abuts against the first buckling surface.

[0016] Beneficial effects:

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The utility model, through the second abutment surface, the pre-abutment surface and the cylinder, the second torsion spring is pre-installed in the base, reducing the adjustment time required for the tripping mechanism to be installed in the base; since the pre-abutment surface is flush with the second abutment surface, when the leakage circuit breaker is not closed, one end of the second torsion spring will abut the pre-abutment surface, preventing the tripping mechanism from protruding from the base due to vibration during transportation of the leakage circuit breaker; the force released by the first torsion spring is applied to the contact bracket, so that the contact bracket is movably connected to the swinging member, the tripping frame is movably connected to the swinging member through the transmission arm, and the tripping frame provides support for the tripping block, so that the tripping mechanism forms a whole, which greatly reduces the time required for assembly, improves production efficiency, and enables the product to have the advantages of improving assembly efficiency and reducing manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a tripping mechanism of a leakage circuit breaker of the utility model;

[0020] Figure 2 This is a front view of a tripping mechanism of a leakage circuit breaker of the utility model;

[0021] Figure 3 It is a schematic diagram of the side cross-section structure of a tripping mechanism of a leakage circuit breaker of the utility model;

[0022] Figure 4 For this utility model Figure 3 A partial structure enlarged diagram of a detail A of a tripping mechanism of a residual current circuit breaker;

[0023] Figure 5 It is an exploded diagram of a tripping mechanism of a leakage 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, tripping mechanism; 3, handle; 4, swinging member; 5, tripping block; 6, tripping frame; 7, contact support; 8, connecting rod; 9, second torsion spring; 9.1, torsion spring;

[0026] 11. Leakage detection device; 12. Arc extinguishing device; 13. Electromagnetic release; 14. Third torsion spring; 15. Fourth torsion spring; 16. First static contact frame; 17. Second static contact frame; 18. Wiring terminal; 19. Limiting plate;

[0027] 181. Bimetallic strip; 182. Tie rod;

[0028] 191. second abutting surface; 192. pre-abutting surface; 193. second cylinder;

[0029] 41. first abutting surface; 42. first pressure-bearing surface; 43. indicating surface; 44. top surface;

[0030] 51. Second buckling surface;

[0031] 61. release portion; 62. first pressing surface; 93. transmission arm;

[0032] 71. first torsion spring; 72. moving contact frame; 73. second pressure-bearing part; 74. first cylinder; 75. pin shaft; 76. flexible connecting wire. 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 5 A tripping mechanism of a leakage circuit breaker comprises a base 1, a tripping mechanism 2 rotatably connected to the base 1, and a handle 3 rotatably connected to the base 1, the tripping mechanism 2 comprises a swinging member 4, a tripping block 5, a tripping frame 6, and a contact bracket 7, one end of the tripping block 5 is hinged to one end of the swinging member 4 and abuts against the tripping frame 6, the tripping block 5 is provided with a connecting rod 8 and connected to the handle 3, the tripping frame 6 is linked with the swinging member 4, the contact bracket 7 is rotatably connected to the two sides of the swinging member 4, the contact bracket 7 is provided with a first torsion spring 71, and respectively abuts against the contact bracket 7 and the swinging member 4, the base 1 is provided with a second torsion spring 9, and respectively abuts against the swinging member 4 and the base 1;

[0036] It is worth mentioning that the base 1 is provided with a leakage detection device 11, an arc extinguishing device 12, an electromagnetic release 13, a third torsion spring 14, a fourth torsion spring 15, a first static contact frame 16, and a second static contact frame 17. Terminals 18 are provided at both ends of both sides of the base 1, wherein the terminal 18 on one side is provided with a bimetallic strip 181, and the terminal 18 on the other side is electrically connected to the third torsion spring 14, and the third torsion spring 14 is linked with the torsion spring in the handle 3. The bimetallic strip 181 is provided with a pull rod 182 and is inserted into the trip frame 6. The leakage detection device 11 detects leakage in the circuit. Since it is a public prior art, it will not be described in detail here. The pull rod 182 is used in conjunction with the bimetallic strip 181;

[0037] It is worth mentioning that the input end of the leakage detection device 11 is electrically connected to the fourth torsion spring 15, the lead-out end of the leakage detection device 11 is electrically connected to the second static contact frame 17 and one end of the electromagnetic release 13 respectively, the other end of the electromagnetic release 13 is electrically connected to the first static contact frame 16, and the arc extinguishing device 12 is located below the contacts of the first static contact frame 16 and the second static contact frame 17. The existing leakage circuit breaker structure generally takes power from the circuit board and the test device at the upper or lower end of the leakage circuit breaker. The side of the circuit board in the leakage detection device 11 that takes power is the load side, and the side that does not take power is the incoming line side. If reversed, the power-taking end of the circuit board becomes the power supply side, even if the moving contact frame 72 disconnects the line, The circuit board is still powered on. If the circuit board is powered on all the time, the magnetic tripping coil and the circuit board will soon be burned, causing damage to the entire circuit breaker. In order to prevent the above situation from happening, when the switch is opened, the third torsion spring 14 does not contact the fourth torsion spring 15. The third torsion spring 14 is linked by the torsion spring 9.1 in the handle 3. When the handle 3 moves, the torsion spring 9.1 drives one end of the third torsion spring 14 to abut against the fourth torsion spring 15, so that the current passes through the third torsion spring 14 and the fourth torsion spring 15 and is transmitted to the input end of the circuit board in the leakage detection device 11. When the handle 3 is reset, the connection between the third torsion spring 14 and the fourth torsion spring 15 is interrupted, and the circuit board is powered off, thereby ensuring the safety of the circuit board.

[0038] It is worth mentioning that the swing member 4 is provided with a first abutting surface 41, first pressure-bearing parts are provided on both sides of the swing member 4, the swing member 4 is provided with an indicating surface 43, and top surfaces 44 are provided on both sides of the swing member 4. The first abutting surface 41 provides a support point for one end of the second torsion spring 9, and the first pressure-bearing part is used in conjunction with the first torsion spring 71. The indicating surface 43 is divided into two, red and green respectively. When the leakage circuit breaker is opened, the indicating surface 43 rotates to green, and when the leakage circuit breaker is closed, the indicating surface 43 rotates to red, and the top surface 44 serves to limit the movable range of the contact bracket 7.

[0039] It is worth mentioning that the base 1 is provided with a limit plate 19, the limit plate 19 is provided with a second abutting surface 191 and a pre-abutting surface 192, the pre-abutting surface 192 is flush with the first abutting surface 41, the base 1 is also provided with a second cylinder 193, the limit plate 19 limits the swinging member 4, the second abutting surface 191 provides a support point for one end of the second torsion spring 9, the pre-abutting surface 192 facilitates the second torsion spring 9 to be pre-installed in the base 1, and the second cylinder 193 prevents the second torsion spring 9 from detaching;

[0040] It is worth mentioning that the contact bracket 7 is provided with a moving contact bracket 72, and is electrically connected to the bimetallic strip 181 through a flexible connecting line 76. The moving contact bracket 72 is connected and fixed to the contact bracket 7 through injection molding. The contact bracket 7 is provided with a second pressure-bearing portion 73. The contact bracket 7 is provided with a first cylinder 74. The first cylinder 74 is inserted with a pin shaft 75, and passes through the swing member 4 and abuts the base 1. The moving contact bracket 72 mainly transmits the function of current, and facilitates the movement of the contact bracket 7 through the flexible connecting line 76. The second pressure-bearing portion 73 cooperates with the use of the first torsion spring 71. The first cylinder 74 prevents the first torsion spring 71 from detaching from the contact bracket 7. The pin shaft 75 is the hinge point where the swing member 4 is hinged to the base 1 and the contact bracket 7 is hinged to the swing member 4.

[0041] It is worth mentioning that the first torsion spring 71 is arranged on the outer wall of the first cylinder 74, and respectively abuts against the first pressure-bearing portion and the second pressure-bearing portion 73, so that the contact bracket 7 abuts against the top surface 44. The second torsion spring 9 is arranged on the outer wall of the second cylinder 193, and respectively abuts against the first abutting surface 41 and the pre-abutting surface 192, so that the swinging member 4 abuts against the limiting plate 19. The elastic force released by the first torsion spring 71 is applied to the contact bracket 7, so that the contact bracket 7 is tightly attached to the top surface 44, thereby preventing the contact bracket 7 from being separated from the swinging member 4 when the tripping mechanism 2 is taken out. The first abutting surface 41 and the pre-abutting surface 192 prevent the tripping mechanism 2 from being entangled with one end of the second torsion spring 9 or giving way when assembling the tripping mechanism 2. The pre-abutting surface 192 bears the elastic force of the second torsion spring 9, which facilitates the tripping mechanism 2 to smoothly enter the base 1, thereby improving the assembly efficiency.

[0042] It is worth mentioning that the trip frame 6 is arranged between the contact brackets 7, and the trip frame 6 is provided with a trip portion 61 and a first buckling surface 62. The trip portion 61 is located on the motion trajectory of the moving iron core of the electromagnetic trip device 13. A transmission arm 93 is provided on one side of the trip frame 6 and is connected and fixed to the swing member 4. The trip portion 61 is used in conjunction with the electromagnetic trip device 13. During assembly, the first buckling surface 62 plays a role in supporting the tripping block 5, and the transmission arm 93 plays a role in transmitting the force from the trip frame 6 to the swing member 4, so that the trip frame 6 and the swing member 4 are linked and connected to move;

[0043] It is worth mentioning that the trip block 5 is provided with a second buckling surface 51 which abuts against the first buckling surface 62 . When the switch is closed, the second buckling surface 51 transmits the force from the connecting rod 8 to the first buckling surface 62 .

[0044] The working principle of the utility model is now described as follows:

[0045] Example 1

[0046] When pressure is applied to the handle 3 to make it rotate, the torsion spring 9.1 in the handle 3 stores energy, and the force is transmitted to the tripping block 5 through the connecting rod 8, driving the tripping block 5 to rotate and push the release member and the swing member 4 to move together. The first abutment surface 41 pushes one end of the second torsion spring 9 to move to store energy, and the distance between the tripping part 61 and the moving iron core of the electromagnetic release 13 is gradually shortened, and the swing member 4 rotates around the axis of the pin shaft 75. With the movement of the swing member 4, the distance between the first pressure-bearing part and the second pressure-bearing part 73 is As the distance gradually shortens, the first torsion spring 71 releases its elastic force, driving the contact bracket 7 to rotate around the axial direction of the pin shaft 75, so that the movable contact bracket 72 abuts against the first static contact bracket 16 and the second static contact bracket 17, so that the wiring terminals 18 on both sides of the base 1 are turned on. When the swinging member 4 moves to its full position, the elastic force of the torsion spring 9.1 in the handle 3 forms a holding point between the second buckling surface 51 and the first buckling surface 62, so that the tripping mechanism 2 is fixed in the position after the movement, and the closing operation is completed through the above-mentioned operation steps.

[0047] Example 2

[0048] Push the handle 3 in the opposite direction, the torsion spring 9.1 in the handle 3 releases its elastic force, speeding up the rotation of the handle 3, and the connecting rod 8 drives the trip block 5 to reset. The first pressing surface 62 and the second pressing surface 51 are kept apart, and the second torsion spring 9 releases its elastic force to the first abutting surface 41, pushing the swinging member 4 and the tripping frame 6 to reset. The first pressure-bearing part is away from the second pressure-bearing part 73, so that the moving contact frame 72 is reset and separated from the first static contact frame 16 and the second static contact frame 17. The above-mentioned operation steps complete the opening operation.

[0049] Example 3

[0050] When a short circuit occurs in the circuit connected to the leakage circuit breaker, the current exceeds several times the normal current, but the occurrence time is short, generally in milliseconds. The electromagnetic release 13 generates an electromagnetic force greater than the reaction force of the spring, pushing the moving iron core to extend quickly and pushing the tripping part 61 to move. The driving force is greater than the force of the holding point of the first buckling surface 62 and the second buckling surface 51, thereby disintegrating them, and then resetting the swinging member 4 and the tripping frame 6, and the first pressure-bearing part is away from the second pressure-bearing part 73, so that the moving contact frame 72 is reset, and the moving contact frame 72 is separated from the first static contact frame 16 and the second static contact frame 17, thereby ensuring the safety of the circuit.

[0051] Example 4

[0052] When an overload occurs, the current gradually increases, and the overload duration is in seconds. The electromagnetic release 13 will not trip, but the overload causes the terminal 18 and the bimetallic strip 181 to generate high temperature. The bimetallic strip 181 bends due to the heat and pulls the trip frame 6 through the pull rod 182 to rotate the trip frame 6 and drive the trip block 5 to rotate, so that the holding point of the first buckling surface 62 and the second buckling surface 51 is disintegrated, and then the swing member 4 and the trip frame 6 are reset, and the first pressure-bearing part is away from the second pressure-bearing part 73, so that the moving contact frame 72 is reset, and the moving contact frame 72 is separated from the first static contact frame 16 and the second static contact frame 17, thereby ensuring the safety of the circuit.

[0053] The above design scheme can enable the product to achieve the advantages of improving assembly efficiency and reducing manufacturing costs.

[0054] 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 tripping mechanism for a leakage circuit breaker, comprising a base (1), a tripping mechanism (2) rotatably connected to the base (1), and a handle (3) rotatably connected to the base (1), characterized in that: The tripping mechanism (2) comprises a swinging member (4), a tripping block (5), a tripping frame (6), and a contact bracket (7); one end of the tripping block is hinged to one end of the swinging member (4) and abuts against the tripping frame (6); the tripping block (5) is provided with a connecting rod (8) and is connected to the handle (3); the tripping frame (6) is linked to the swinging member (4); the contact bracket (7) is rotatably connected to two side surfaces of the swinging member (4); the contact bracket (7) is provided with a first torsion spring (71) and abuts against the contact bracket (7) and the swinging member (4) respectively; the base (1) is provided with a second torsion spring (9) and abuts against the swinging member (4) and the base (1) respectively.

2. The tripping mechanism of the leakage circuit breaker according to claim 1, characterized in that: The base (1) is provided with a leakage detection device (11), an arc extinguishing device (12), an electromagnetic release (13), a third torsion spring (14), a fourth torsion spring (15), a first static contact frame (16), and a second static contact frame (17). Both ends of the base (1) are provided with wiring terminals (18), wherein the wiring terminal (18) on one side is provided with a bimetallic strip (181), and the wiring terminal (18) on the other side is electrically connected to the third torsion spring (14). The third torsion spring (14) is linked to the torsion spring in the handle (3), and the bimetallic strip (181) is provided with a pull rod (182) and is inserted into the trip frame (6).

3. The tripping mechanism of the leakage circuit breaker according to claim 2, characterized in that: The input end of the leakage detection device (11) is electrically connected to the fourth torsion spring (15), the lead-out end of the leakage detection device (11) is electrically connected to the second static contact frame (17) and one end of the electromagnetic release (13), respectively, the other end of the electromagnetic release (13) is electrically connected to the first static contact frame (16), and the arc extinguishing device (12) is located below the contacts of the first static contact frame (16) and the second static contact frame (17).

4. The tripping mechanism of the leakage circuit breaker according to claim 2, characterized in that: The swing member (4) is provided with a first abutting surface (41), first pressure-bearing portions are provided on both sides of the swing member (4), the swing member (4) is provided with an indicating surface (43), and top surfaces (44) are provided on both side surfaces of the swing member (4).

5. The tripping mechanism of the leakage circuit breaker according to claim 4, characterized in that: The base (1) is provided with a limiting plate (19), the limiting plate (19) is provided with a second abutting surface (191) and a pre-abutting surface (192), the pre-abutting surface (192) is flush with the first abutting surface (41), and the base (1) is also provided with a second cylinder (193).

6. The tripping mechanism of the leakage circuit breaker according to claim 5, characterized in that: The contact support (7) is provided with a movable contact frame (72) and is electrically connected to the bimetallic strip (181) via a flexible connecting wire (76); the movable contact frame (72) is connected and fixed to the contact support (7) by injection molding; the contact support (7) is provided with a second pressure-bearing portion (73); the contact support (7) is provided with a first cylinder (74); a pin shaft (75) is inserted into the first cylinder (74), passes through the swing member (4) and abuts against the base (1).

7. The tripping mechanism of the leakage circuit breaker according to claim 6, characterized in that: The first torsion spring (71) is arranged on the outer wall of the first cylinder (74) and respectively abuts against the first pressure-bearing portion and the second pressure-bearing portion (73), so that the contact bracket (7) abuts against the top surface (44); the second torsion spring (9) is arranged on the outer wall of the second cylinder (193) and respectively abuts against the first abutting surface (41) and the pre-abutting surface (192), so that the swinging member (4) abuts against the limiting plate (19).

8. The tripping mechanism of the leakage circuit breaker according to claim 2, characterized in that: The trip frame (6) is arranged between the contact brackets (7), and is provided with a trip portion (61) and a first pressing surface (62). The trip portion (61) is located on the movement track of the moving iron core of the electromagnetic tripper (13). A transmission arm (93) is provided on one side of the trip frame (6) and is connected and fixed to the swing member (4).

9. The tripping mechanism of the leakage circuit breaker according to claim 8, characterized in that: The jump buckle block (5) is provided with a second buckling surface (51) which abuts against the first buckling surface (62).

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