Overload protection current adjustable mechanism of molded case circuit breaker

Abstract

The utility model relates to a molded case circuit breaker overload protection current adjustable mechanism, and relates to the technical field of circuit breakers, the molded case circuit breaker overload protection current adjustable mechanism comprises a base, a middle cover plate and an outer cover plate, the base is connected with the middle cover plate, the middle cover plate is connected with the outer cover plate, the base is provided with an operating mechanism, the operating mechanism is provided with a circuit protection device, one side of the circuit protection device is provided with a draw bar, and the draw bar is connected with the outer cover plate. An overload protection device is arranged on the traction rod, a thermomagnetic protection device is arranged on the side, away from the traction rod, of the overload protection device, and an adjusting screw used for being matched with the overload protection device is arranged between the overload protection device and the thermomagnetic protection device. The overload protection device comprises a sliding plate connected to the traction rod in a sliding mode, a plurality of step-shaped contact pieces are arranged on the sliding plate, and the step-shaped contact pieces are matched with the adjusting screws to be used for adjusting overload protection current. According to the invention, the rated current can be accurately adjusted, and electric element damage caused by too large or too small rated current is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit breaker technical field especially relates to a plastic -clad circuit breaker overload protection current adjustable mechanism. BACKGROUND

[0002] The plastic -clad circuit breaker has the two -segment protection function of overload delay protection, short -circuit instantaneous protection, and can also be used with leakage, measurement, electric operating mechanism module unit cooperation. In the low -voltage distribution system, it is often used as terminal switch or branch switch, replaces the past commonly used fuse and switch.

[0003] The rated current of the conventional plastic -clad circuit breaker is generally fixed, causes its unable to satisfy the current change with the electric appliance load use situation change in actual situation, and part involves the plastic -clad circuit breaker of adjustable rated current, cannot accurately adjust the rated current gear, needs to cooperate with other devices to adjust each other to determine the size of rated current. SUMMARY

[0004] The purpose of the present application is to provide a plastic -clad circuit breaker overload protection current adjustable mechanism to solve the problem of inaccurate adjustment of rated current gear.

[0005] A plastic -clad circuit breaker overload protection current adjustable mechanism, including base, middle cover plate and outer cover plate, the base connects middle cover plate, the middle cover plate connects outer cover plate, be provided with operating mechanism on the base, be provided with road electricity protection device on the operating mechanism, be provided with traction rod on the one side of road electricity protection device, be provided with overload protection device on the traction rod, the side away from the traction rod of overload protection device is provided with thermal magnetic protection device, be provided with bimetallic strip between overload protection device and thermal magnetic protection device, the end of bimetallic strip is provided with adjusting screw, the overload protection device includes the sliding plate of sliding connection on the traction rod, be provided with a plurality of ladder type contact plates on the sliding plate, the ladder type contact plate is provided with a plurality of ladder faces, the distance of a plurality of ladder faces to adjusting screw is not equal, be equipped with the driving piece for controlling the sliding plate sliding on the sliding plate, bimetallic strip is bent by heat and carries adjusting screw to be close to ladder type contact plate.

[0006] Through the above technical scheme, the position between the ladder type contact piece and the adjusting screw is adjusted by the driving piece to control one end of the sliding plate on the adjusting rod, and the size of the overload protection current can be accurately adjusted, and the size of the current that can pass through the circuit breaker is further expanded by adjusting the road electricity protection device.

[0007] In addition, the rated current after adjustment can be effectively avoided to be too large to cause the damage of the electric element through the road electricity protection device and the thermal magnetic protection device.

[0008] Optionally, a plurality of sliding blocks are arranged on the side of the sliding plate close to the traction rod, a plurality of sliding grooves consistent in number with the sliding blocks are formed in the traction rod, and the sliding blocks extend into the sliding grooves in position.

[0009] By adopting the technical scheme, the sliding plate is connected to the sliding groove through the sliding blocks.

[0010] Optionally, the driving member comprises a rotation part, a first limiting part, a buckle part and a transmission part which are integrally formed, the buckle part and the transmission part extend into the base through the middle cover plate and the outer cover plate in sequence, and the rotation part is inserted into the outer cover plate.

[0011] By adopting the technical scheme, the user can control the rotation of the buckle part and the transmission part by rotating the rotation part.

[0012] Optionally, a connecting block is arranged on the sliding plate, a driving hole is formed in the connecting block, the rotation part and the buckle part are coaxially arranged, the buckle part and the transmission part are eccentrically arranged, and the transmission part extends into the driving hole.

[0013] By adopting the technical scheme, the rotation part and the transmission part are eccentrically arranged, so that the transmission part moves along the center of the rotation part when the rotation part is rotated.

[0014] Optionally, the first limiting part is arranged between the rotation part and the buckle part, an arc-shaped notch is formed in the first limiting part, a sunken groove is formed in the middle cover plate, the first limiting part is arranged in the sunken groove, a clamping plate for limiting the driving member is arranged in the first limiting part, and the side wall of the clamping plate abuts against the inner side wall of the first limiting part.

[0015] By adopting the technical scheme, the angle of the rotation part can be controlled through the cooperation of the first limiting part and the clamping plate.

[0016] Optionally, a clamping groove is formed in the buckle part, a rotating hole is formed in the sunken groove, the buckle part extends into the rotating hole, and the inner wall of the rotating hole abuts against the inner wall of the clamping groove.

[0017] By adopting the technical scheme, the driving member is fixed on the middle cover plate through the inner wall of the rotating hole extending into the clamping groove.

[0018] Optionally, the driving member comprises a translation part, a protection part, a buckle part, a second limiting part and a transmission part, the outer cover plate is provided with a strip-shaped hole for embedding the translation part, the length extension direction of the protection part is consistent with the length extension direction of the strip-shaped hole, the extension length of the protection part is greater than the extension length of the strip-shaped hole, the middle cover plate is provided with a limiting groove, the second limiting part is provided with a limiting piece, the limiting piece is matched with the limiting groove, the middle cover plate is matched with the buckle part for fixing the driving member, the middle axis of the transmission part is located on the same line with the middle axis of the translation part, and the transmission part extends into the driving hole.

[0019] By adopting the above technical scheme, the translation part can directly move along the length extension direction of the strip-shaped hole. During the movement, the limiting piece is extruded with the clamping plate on the limiting groove, and the limiting piece is deformed. When the driving member moves to the next gear, the limiting piece stops extruding with the clamping plate, and the position between the adjusting screw and the stepped contact plate changes.

[0020] Optionally, the outer cover plate is provided with a gear mark matched with the limiting groove.

[0021] By adopting the above technical scheme, it is convenient for people to adjust the overload protection device to the expected gear.

[0022] In summary, the present application has at least one of the following beneficial technical effects:

[0023] 1. The rated current can be accurately adjusted, and the gears can be adjusted.

[0024] 2. The damage of the electric element caused by the too large or too small rated current can be effectively avoided. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic diagram of the overall structure of embodiment 1 of the present application;

[0026] Figure 2 is a schematic diagram of the overall structure of embodiment 1 of the present application, mainly embodying the mechanism in the base;

[0027] Figure 3 is Figure 2 is a partial enlarged schematic diagram of part A of the middle cover plate;

[0028] Figure 4 is an exploded structural schematic diagram of the overload protection device of embodiment 1 of the present application;

[0029] Figure 5 is a structural schematic diagram of the driving member of embodiment 1 of the present application;

[0030] Figure 6 is a partial structural schematic diagram of embodiment 2 of the present application, mainly embodying the driving member, the middle cover plate and the outer cover plate.

[0031] BRIEF DESCRIPTION OF DRAWINGS:1, base; 2, middle cover plate; 3, outer cover plate; 4, thermal magnetic protection device; 5, road electricity protection device; 6, operating mechanism; 7, traction rod; 701, sliding groove; 702, mounting groove; 8, stepped contact plate; 9, sliding plate; 901, sliding block; 902, limit block; 10, driving piece; 11, adjusting screw; 12, connecting block; 13, driving hole; 14, rotating part; 15, first limiting part; 16, clamping groove; 17, clamping part; 18, transmission part; 19, circular hole; 20, sink groove; 21, rotating hole; 22, clamping plate; 23, translation part; 24, protection part; 25, second limiting part; 26, strip-shaped hole; 27, protection groove; 28, limiting groove; 29, gear identification. DETAILED DESCRIPTION

[0032] The following will be described in detail below Figure 1 - the drawings Figure 6 , the present application is further described in detail.

[0033] Example 1:

[0034] A kind of overload protection current adjustable mechanism of molded case circuit breaker, refer to Figure 1 , Figure 2 , including base 1, middle cover plate 2 and outer cover plate 3, base 1 connects middle cover plate 2, middle cover plate 2 connects outer cover plate 3, base 1 is provided with operating mechanism 6, operating mechanism 6 is provided with road electricity protection device 5, one side of road electricity protection device 5 has rotatingly connected traction rod 7 on base 1, traction rod 7 is provided with overload protection device, the side of overload protection device away from traction rod 7 is provided with thermal magnetic protection device 4, between overload protection device and thermal magnetic protection device 4 is provided with bimetal, and the upper end of bimetal is provided with adjusting screw 11.

[0035] In related art, when road electricity current is too large, bimetal is bent by heat to make adjusting screw 11 contact with traction rod 7, resulting in circuit disconnection.

[0036] Road electricity protection device 5 is used to adjust road electricity current, by the cooperation of road electricity protection device 5 and overload protection device, further expand the size of adjustable road electricity current. At the same time, when current is too large, overload occurs, the circuit can be quickly cut off to protect the safety of equipment.

[0037] Thermal magnetic protection device 4 avoids the rapid cut-off of power supply when road electricity current is too large to cause circuit overload or short circuit, preventing equipment damage and accident expansion.

[0038] Overload protection device includes slidingly connected sliding plate 9 on traction rod 7 and fixedly connected stepped contact plate 8 on sliding plate. Sliding plate 9 is located on the side of traction rod 7 close to thermal magnetic protection device 4, and sliding plate 9 slides along the length direction of traction rod 7.

[0039] Reference Figure 3 、 Figure 4 Three stepped contact plates 8 are fixedly connected to the sliding plate 9, and the three stepped contact plates 8 are provided with three stepped surfaces on the side close to the adjusting screw 11. The three stepped surfaces are arranged along the length direction of the sliding plate 9, and the three stepped surfaces are arranged away from the adjusting screw 11 in sequence. The displacement of the adjusting screw 11 from the three stepped surfaces is different, so as to form three gears that can pass through different currents. In other embodiments, the number of stepped surfaces is four or other number of stepped surfaces, so as to expand the adjustment range.

[0040] Three sliding blocks 901 are fixedly connected to the sliding plate 9, and the sliding blocks 901 are arranged on the side of the stepped contact plate 8 close to the traction rod 7. The traction rod 7 is provided with three sliding grooves 701, and the sliding blocks 901 are slidingly connected in the sliding grooves 701.

[0041] A limiting block 902 is fixedly connected to the end of the sliding block 901 away from the stepped contact plate 8, and the limiting block 902 is arranged on the side of the traction rod 7 away from the stepped contact plate 8.

[0042] The side of the sliding groove 701 close to the neutral circuit is provided with a mounting groove 702, and the limiting block 902 can pass through the mounting groove 702 so that the limiting block 902 is located on the side of the traction rod 7 away from the stepped contact plate, and the sliding of the sliding block 901 in the sliding groove 701 is limited.

[0043] A connecting block 12 is fixedly connected to the sliding plate 9, and the connecting block 12 is arranged on the side of the sliding plate 9 away from the traction rod 7. The connecting block 12 is provided with a driving hole 13.

[0044] Reference Figure 1 、 Figure 4 、 Figure 5 The overload protection device further comprises a driving member 10, and the driving member 10 penetrates the outer cover plate 3, the middle cover plate 2 in sequence and extends into the driving hole 13.

[0045] The driving member 10 comprises an integral rotating part 14, a first limiting part 15, a buckle part 17 and a transmission part 18. The rotating part 14 is cylindrical, and the rotating part 14 is provided with a rotating groove for facilitating operation by a user. The first limiting part 15 is provided with an arc-shaped notch. The buckle part 17 is cylindrical, and the buckle part 17 is provided with a clamping groove 16. The transmission part 18 is cylindrical, and the transmission part 18 extends into the driving hole 13. The rotating part 14 and the buckle part 17 are coaxially arranged, and the buckle part 17 and the transmission part 18 are eccentrically arranged.

[0046] The outer cover plate 3 is provided with a circular hole 19, and the rotating part 14 penetrates the circular hole 19 and extends away from the outer cover plate 3. The middle cover plate 2 is provided with a sunken groove 20, and the first limiting part 15 is arranged on one side of the sunken groove 20 close to the outer cover plate 3. The sunken groove 20 is fixedly connected with a clamping plate 22, and the first limiting part 155 cooperates with the clamping plate 22 to limit the angle of rotation of the driving part 10. The middle cover plate 2 is provided with a rotating hole 21 at the center of the sunken groove 20, the clamping part 17 extends into the rotating hole, and the inner wall of the rotating hole 21 abuts against the inner wall of the clamping groove 16.

[0047] The implementation principle of the embodiment of the present application is that the overload current can be adjusted by rotating the rotating part 14 on the driving part 10. After the rotating part 14 rotates clockwise or counterclockwise, the transmission part 18 rotates in the driving hole 13. When the transmission part 18 is transmitted to a certain angle, the transmission part 18 will be tightly attached to the side wall of the driving hole 13. At this time, the driving part 10 is further rotated, the transmission part 18 pushes the connecting block 12 to move horizontally in the direction of rotation of the driving part 10, further moves the sliding plate 9 along the length direction of the sliding groove 701, changes the position between the adjusting screw 11 and the stepped contact plate 8, and changes the distance between the traction rod 7 and the adjusting screw 11, so as to adjust the size of the overload current.

[0048] At the same time, the overload current in the circuit breaker can be further adjusted through the road electric protection device 5, so as to meet the daily electricity demand of people.

[0049] Embodiment 2:

[0050] A kind of overload protection current adjustable mechanism of molded case circuit breaker, reference Figure 6 The difference between the embodiment 1 and the embodiment 2 is that the driving part 10 includes an integrally formed translation part 23, a protection part 24, a clamping part 17, a second limiting part 25 and a transmission part 18.

[0051] The translation part 23 is cylindrical. The protection plate is a long strip plate extending towards the traction rod 7. The second limiting part 25 is cylindrical, and a cylindrical limiting part is fixedly connected to the second limiting part 25. The central axis of the second limiting part 25 is consistent with the central axis of the translation part 23, and the central axis of the limiting part is close to the edge of the second limiting part 25. The transmission part 18 is cylindrical, and the central axis of the transmission part 18 is on the same straight line as the central axis of the translation part 23. The outer cover plate 3 is provided with a strip hole 26 for nesting the translation part 23. The middle cover plate 2 is provided with a protection groove 27, and the protection part 24 is arranged in the protection groove 27. The protection groove 27 is provided with a limiting groove 28.

[0052] The strip hole 26, the protection part 24, the protection groove 27 and the limiting groove 28 have consistent length extension directions. The extension length of the protection part 24 is greater than the extension length of the strip hole 26, and the extension length of the protection groove 27 is greater than the extension length of the protection part 24.

[0053] Three clamping plates 22 are arranged in the length direction of the limiting groove 28, and the limiting member slides in the length direction of the limiting groove 28.

[0054] The transmission part 18 extends into the driving hole 13.

[0055] The outer cover plate 3 is provided with a gear mark 29 matched with the limiting groove 28.

[0056] The implementation principle of the embodiment of the present application is that the translation part 23 can directly move along the extension direction of the strip-shaped hole 26. During the movement, the limiting member is extruded with the clamping plate 22 on the limiting groove 28, and at this time, the limiting member is deformed. When the driving member 10 moves to the next gear, the limiting member stops extruding with the clamping plate 22, and at this time, the position between the adjusting screw 11 and the stepped contact plate is changed.

[0057] The embodiments of the specific embodiment are the preferred embodiments of the present application, and are not limited to the protection scope of the present application. The same parts are indicated by the same reference numerals. Therefore, equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A kind of plastic shell circuit breaker overload protection current adjustable mechanism, including base (1), middle cover plate (2) and outer cover plate (3), the base (1) is connected middle cover plate (2), the middle cover plate (2) is connected outer cover plate (3), operating mechanism (6) is provided on the base (1), it is characterized by: The operation mechanism (6) is provided with a road power protection device (5), one side of the road power protection device (5) is provided with a traction rod (7), the traction rod (7) is provided with an overload protection device, the overload protection device is provided with a thermal magnetic protection device (4) away from one side of the traction rod (7), a bimetallic strip is arranged between the overload protection device and the thermal magnetic protection device (4), the bimetallic strip is provided with an adjusting screw (11) at the end, the overload protection device comprises a sliding plate (9) slidably connected to the traction rod (7), the sliding plate (9) is provided with a plurality of stepped contact plates (8), the stepped contact plate (8) is provided with a plurality of stepped surfaces, the distances from the stepped surfaces to the adjusting screw (11) are different, the sliding plate (9) is provided with a driving piece (10) for controlling the sliding of the sliding plate, the bimetallic strip is bent by heat and carries the adjusting screw (11) to approach the stepped contact plate (8).

2. The overload protection current adjustable mechanism of the molded case circuit breaker of claim 1, wherein: A plurality of sliding blocks (901) are arranged on one side of the sliding plate (9) close to the traction rod (7), a plurality of sliding grooves (701) consistent in number with the sliding blocks (901) are formed in the traction rod (7), and the sliding blocks (901) extend into the sliding grooves (701) corresponding in position.

3. The adjustable overload protection current mechanism for a molded case circuit breaker of claim 1, wherein: The driving piece (10) comprises an integral rotating part (14), a first limiting part (15), a buckle part (17) and a transmission part (18), the buckle part (17) and the transmission part (18) penetrate the middle cover plate (2) and the outer cover plate (3) in sequence and extend into the base (1), and the rotating part (14) is inserted into the outer cover plate (3).

4. The overload protection current adjustable mechanism of the molded case circuit breaker of claim 3, wherein: The sliding plate (9) is provided with a connecting block (12), a driving hole (13) is formed in the connecting block (12), the rotating part (14) and the buckle part (17) are coaxially arranged, the buckle part (17) and the transmission part (18) are eccentrically arranged, and the transmission part (18) extends into the driving hole (13).

5. The adjustable overload protection current mechanism for a molded case circuit breaker of claim 4, wherein: The first limiting part (15) is arranged between the rotating part (14) and the buckle part (17), an arc-shaped notch is formed in the first limiting part (15), a sunken groove (20) is formed in the middle cover plate (2), the first limiting part (15) is arranged in the sunken groove (20), a clamping plate (22) for limiting the driving piece (10) is arranged in the first limiting part (15), and the side wall of the clamping plate (22) abuts against the inner side wall of the first limiting part (15).

6. The adjustable overload protection current mechanism for a molded case circuit breaker of claim 5, wherein: A clamping groove (16) is formed in the buckle part (17), a rotating hole (21) is formed in the sunken groove (20), the buckle part (17) extends into the rotating hole (21), and the inner wall of the rotating hole (21) abuts against the inner wall of the clamping groove (16).

7. The mechanism for adjusting overload protection current of a molded case circuit breaker of claim 3, wherein: The driving member (10) comprises an integrally formed translation part (23), a protection part (24), a buckle part (17), a second limiting part (25), a transmission part (18), the outer cover plate (3) is provided with a strip-shaped hole (26) for embedding the translation part (23), the length extension direction of the protection part (24) is consistent with the length extension direction of the strip-shaped hole (26), the extended length of the protection part (24) is greater than the extended length of the strip-shaped hole (26), the middle cover plate (2) is provided with a limiting groove (28), the second limiting part (25) is provided with a limiting piece, the limiting piece is matched with the limiting groove (28), the middle cover plate (2) is matched with the buckle part (17) for fixing the driving member (10), the central axis of the transmission part (18) is located on the same straight line with the central axis of the translation part (23), and the transmission part (18) extends into the driving hole (13).

8. The mechanism for adjusting overload protection current of a molded case circuit breaker according to claim 6, wherein: The outer cover plate (3) is provided with a gear mark (29) matched with the limiting groove (28).

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