A quick-release device

Abstract

The present invention discloses a quick tripping device, which includes a mechanism bracket, a connecting rod device, a contact connecting rod, a main shaft, a moving contact, a static contact, a tripping latch and a latch assembly device; one end of the tripping latch is lapped with the latch assembly device, and the other end is connected to the mechanism bracket through a rotating shaft. In the non-overload state, the moving contact and the static contact are in contact with each other. In the overload state, due to the existence of the electro-dynamic repulsive force, the force exerted by the tripping latch on the latching surface of the latch assembly device suddenly increases, causing the locking plate to deflect upward against the pressure of the latch compression spring. The pushing surface pushes the second latch to rotate clockwise. After the second latch rotates clockwise, the position of the first latch assembly is unlocked. The first latch assembly rotates clockwise, the latching surface is separated from the tripping latch, and the tripping latch rotates counterclockwise to complete the tripping process and the contacts are opened.

Description

Technical Field

[0001] The present invention relates to the field of low-voltage electrical component devices, and particularly to a mechanism of a current-limiting molded case circuit breaker. Background Art

[0002] At present, molded case circuit breakers (MCCB, hereinafter referred to as circuit breakers) are commonly used in low-voltage distribution systems to connect and disconnect loads and protect the safety of lines and equipment, belonging to the category of low-voltage electrical appliances.

[0003] The quality of the short-circuit breaking performance of a circuit breaker depends on various factors such as the opening time of the contacts, the speed of contact movement, and the performance of the arc extinguishing chamber. When other factors are the same, the earlier the contacts of the circuit breaker open, the better its short-circuit breaking performance.

[0004] There are several short-circuit breaking processes of the existing molded case circuit breakers:

[0005] 1. Since large-capacity electronic molded case circuit breakers are small in size, there is generally no electromagnetic release designed inside.

[0006] When the current transformer inside the circuit breaker detects a short-circuit current, after calculation by the controller, a tripping command is sent to the flux converter, the flux converter pushes the latch of the operating mechanism, the latch is unlocked, the mechanism acts, and the contacts open. This kind of circuit breaker has no quick tripping, that is, current-limiting device, and can only break lower short-circuit currents. However, since it is an electronic release, it is easy to implement various extended functions.

[0007] 2. When a short-circuit current occurs, an electric repulsive force is generated between the moving and static contacts, which pushes the moving contact to overcome the reaction force of the contact spring and move rapidly away from the static contact; at the same time, the short-circuit current causes the electromagnetic release to drive the latch of the mechanism to rotate and trip quickly to maintain the movement of the moving contact away from the static contact. Since the response speed of the electromagnetic release of this kind of circuit breaker is slow, it has a good effect when breaking a large short-circuit current and has a low cost.

[0008] In these two types of circuit breakers, the latches are all integrated. At present, the market is seeking a product that can combine the advantages of the above two types of products.

[0009] Chinese Patent No. 201020162757.8 discloses a trip device for a plastic case circuit breaker, which includes a wire coil and an iron core. A number of turns of enameled wire are wound around the wire coil and led out by two wires. A spring is arranged inside the wire coil. The iron core is in a stepped shape. The lower half of the iron core is arranged inside the spring. The wire coil is fixed between an upper bracket and a lower bracket. Upper and lower gaskets are respectively arranged between the iron core and the upper and lower brackets. The iron core is 5.5 - 6 mm higher than the upper gasket. The iron core, the upper gasket, the lower gasket, the upper bracket and the lower bracket are respectively provided with holes on the same axis and a lead screw is arranged from top to bottom. The lower gasket is placed inside the wire coil. The upper gasket is 3.5 mm higher than the upper bracket.

[0010] In order to achieve the best effect during use, further: an adjusting nut is arranged at the upper end of the lead screw.

[0011] In order to facilitate reliable tripping of the circuit breaker, further: a push rod is arranged below the lower bracket, and the push rod is connected to the bottom of the lead screw.

[0012] In order to make the acting points on the lead screw and the traction rod of the circuit breaker be on the same straight line, and when the lead screw is not on the same straight line, the circuit breaker can still be reliably tripped, further: a gasket is fixed at the top end of the lead screw through a nut.

[0013] However, such a structural arrangement often poses an obstacle to the pursuit of a smaller volume ratio of the circuit breaker, thus affecting the realization of integration and modularization. In addition, the heat generated during the operation of the circuit breaker and the electromagnetic field generated under high current conditions may affect the tripping function of the circuit breaker. Moreover, since two components need to be assembled separately, it will increase the complexity of the assembly operation and affect the improvement of the assembly efficiency. Summary of the Invention

[0014] The technical problem to be solved by the present invention overcomes the deficiencies of the prior art and provides a quick tripping device. Specifically, in order to solve the above technical problems, the technical solution adopted by the present invention is as follows: The present invention includes a mechanism bracket, a connecting rod device, a contact connecting rod, a main shaft, a moving contact, a static contact, a trip latch, and a locking component device;

[0015] The upper end of the connecting rod device is connected to the trip latch through an upper connecting rod column. The lower end of the connecting rod device is connected to one end of the main shaft. The other end of the main shaft is connected to the upper end of the contact connecting rod. The lower end of the contact connecting rod is connected to the moving contact. All the above connections can rotate;

[0016] One end of the trip latch is lapped with the locking component device. The other end of the trip latch is connected to the mechanism bracket through a rotating shaft and can rotate counterclockwise;

[0017] The latch assembly device includes a first latch assembly and a second latch, both of which are connected to the mechanism bracket through a rotating shaft. The first latch assembly and the second latch abut against each other and can rotate clockwise around the shaft respectively;

[0018] The moving contact and the static contact are in contact with each other.

[0019] Further, the connecting rod device includes an upper connecting rod and a lower connecting rod, which are connected by a rotating shaft. The upper connecting rod is connected to the jumping latch through an upper connecting rod connecting column, and the lower connecting rod is rotatably connected to one end of the main shaft.

[0020] Further, the first latch assembly includes a first latch and a lock plate. The lock plate is connected to the first latch through a rotating shaft. The lock plate can rotate between the limiting devices of the first latch around the rotating shaft. Under the action of an elastic element, the lock plate and the first latch become a rigid body.

[0021] Further, the side of the second latch is in an inverted L shape, and the upper left corner abuts against the upper edge of the first latch assembly.

[0022] Further, the rotating shaft is a rivet.

[0023] Further, the limiting devices are limiting hook 1 and limiting hook 2.

[0024] Further, the elastic element is a latch compression spring installed on spring seat 1 and spring seat 2.

[0025] Further, the jumping latch overlaps with the buckling surface at the lower end of the lock plate.

[0026] The beneficial effects of the present invention are as follows:

[0027] The present invention can enable a large-capacity electronic molded case circuit breaker to have higher short-circuit breaking capacity and realize various expansion functions, thereby making the product more competitive. That is, the circuit breaker applying the technology of the present invention has a controller with rich functions of a type 1 circuit breaker and at the same time has the characteristics of a type 2 circuit breaker with high breaking current. Description of the Drawings

[0028] Figure 1 is the main view of the structure of the present invention;

[0029] Figure 2 is the main view of the first latch assembly;

[0030] Figure 3 is the rear view of the first latch assembly;

[0031] Figure 4 is the exploded view of the first latch assembly;

[0032] Figure 5 is the enlarged view of the jumping latch and the latch assembly.

[0033] Reference numerals in the figure: 1 - mechanism bracket, 2 - main shaft, 3 - lower connecting rod, 4 - snap fastener, 5 - upper connecting rod, 6 - upper connecting rod connecting column, 7 - second lock, 8 - first lock assembly, 9 - contact link, 10 - moving contact, 11 - static contact, 12 - buckle surface, 13 - rivet, 14 - first lock, 15 - compression spring seat 1, 16 - limit hook 1, 17 - limit hook 2, 18 - lock plate, 19 - push surface, 20 - compression spring seat 2, 21 - lock compression spring. Detailed implementation manners

[0034] For the convenience of those of ordinary skill in the art to understand and implement the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0035] As Figure 1 shown, a quick release device of the present invention includes a mechanism bracket 1, an upper connecting rod 5, a lower connecting rod 3, a contact link 9, a main shaft 2, a moving contact 10, a static contact 11, a snap fastener 4, a first lock assembly 8, and a second lock 7. There are two upper connecting rods 5, which are respectively located on both sides of the snap fastener 4. The two upper connecting rods 5 are respectively connected to the snap fastener 4 through upper connecting rod connecting columns 6. One end of the lower connecting rod is rotatably connected to the upper connecting rod, and the other end is rotatably connected to the contact link. The lock is pivotally connected to the mechanism bracket 1. In a non-overload state, the moving contact and the static contact are in contact with each other.

[0036] As Figure 2 , 3 , 4 shown, the current-limiting molded case circuit breaker mechanism further includes a first lock assembly. The first lock assembly includes a first lock 14, a lock plate 18, a lock compression spring 21, and a rivet 13. The lock plate is connected to the first lock by a rivet, and the lock plate can rotate relative to the first lock. The limit hook 1 can prevent the lock plate from moving away from the first lock during rotation. A compression spring seat 1 is designed on the first lock, and a compression spring seat 2 is designed on the lock plate. The lock compression spring is installed on the compression spring seat 2. Due to the existence of the limit hook 2, the first lock assembly 8 can become a rigid body under the action of the lock compression spring 21.

[0037] As Figure 5 shown, in a non-overload state, the force F1 exerted by the snap fastener 4 on the buckle surface 12 in the first lock assembly is relatively small, and it is not enough to push the lock plate to deflect upward against the lock compression spring. Therefore, the circuit breaker can maintain the closed state.

[0038] Combined with Figure 5, and its working process is as follows: In the overload state, due to the existence of the electro-dynamic repulsive force, the force F1 exerted by the tripping buckle 4 on the buckling surface 12 of the locking plate in the first locking component suddenly increases, causing the locking plate 18 to deflect upward against the pressure of the locking buckle compression spring 21. When the locking plate 18 rotates upward, the pushing surface 19 pushes open the upper left corner of the second locking buckle 7 that abuts against the upper edge of the first locking buckle 14. The second locking buckle 7 rotates clockwise, and the first locking component 8 loses its abutment and also rotates clockwise. The pushing surface pushes the second locking buckle to rotate clockwise. After the second locking buckle rotates clockwise, the position of the first locking component is unlocked. The first locking component rotates clockwise, the buckling surface 12 is separated from the tripping buckle 4, and the tripping buckle 4 rotates counterclockwise to complete the tripping process, and the contact is opened.

[0039] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as within the protection scope of the present invention.

Claims

1. A quick release device, characterized in that: it includes a mechanism bracket (1), a connecting rod device, a contact connecting rod (9), a main shaft (2), a moving contact (10), a static contact (11), a tripping latch (4) and a locking component device; The upper end of the connecting rod device is connected to the tripping latch (4), the lower end of the connecting rod device is connected to one end of the main shaft (2), the other end of the main shaft (2) is connected to the upper end of the contact connecting rod (9), and the lower end of the contact connecting rod (9) is connected to the moving contact (10), and all the above connections can rotate; The locking component device is connected to the mechanism bracket (1) through a rotating shaft and can rotate around the shaft; One end of the tripping latch (4) is lapped with the locking component device, and the other end of the tripping latch (4) is connected to the mechanism bracket (1) through a rotating shaft and can rotate counterclockwise; The moving contact (10) and the static contact (11) are in contact with each other; The locking component device includes a first locking component (8) and a second locking latch (7), both of which are connected to the mechanism bracket (1) through a rotating shaft. The first locking component (8) and the second locking latch (7) are abutted against each other and can rotate around their respective shafts; The first locking component (8) includes a first locking latch (14) and a locking plate (18). The locking plate (18) is connected to the first locking latch (14) through a rotating shaft. The locking plate (18) can rotate between the limiting devices of the first locking latch (14) around the rotating shaft. Under the action of the elastic element, the locking plate (18) and the first locking latch (14) become a rigid body, and the tripping latch (4) is lapped with the buckling surface (12) at the lower end of the locking plate (18).

2. A quick release device according to claim 1, characterized in that: The connecting rod device is an upper connecting rod (5) and a lower connecting rod (3), which are connected through a rotating shaft. The upper connecting rod (5) is connected to the tripping latch (4) through an upper connecting rod connecting column (6), and the lower connecting rod (3) is rotatably connected to one end of the main shaft (2).

3. A quick release device according to claim 1, characterized in that: The side of the second locking latch (7) is in an inverted L shape, and the upper left corner abuts against the upper edge of the first locking latch (14).

4. A quick release device according to claim 1, characterized in that: The rotating shaft is a rivet (13).

5. A quick release device according to claim 1, characterized in that: The limiting devices are limiting hook 1 (16) and limiting hook 2 (17), and the elastic element is a locking spring (21) installed on a compression spring seat 1 (15) and a compression spring seat 2 (20).

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