A thermomagnetic molded case circuit breaker

Abstract

This utility model provides a thermomagnetic molded case circuit breaker, including a base, a cover, a thermomagnetic tripping mechanism, and a traction rod. The thermomagnetic tripping mechanism includes a bimetallic element, a thermal adjustment rod, an armature bracket, an armature, and a resilient reset element. The armature bracket is hinged to the armature. A thermomagnetic adjustable mechanism can be installed inside the base, which includes a thermally adjustable mechanism and a magnetically adjustable mechanism. The magnetically adjustable mechanism includes a magnetic adjustment rod and a magnetically adjustable knob. A thermal adjustment rod can be slidably mounted on the traction rod. The thermally adjustable mechanism is used to drive the thermal adjustment rod to move during the adjustment phase. A suspension part is provided on the side of the armature away from the thermal adjustment rod. A hook part is provided on the armature bracket. One end of the resilient reset element is connected to the suspension part, and the other end is selectively connected to the hook part and a hook. This utility model has a reasonable structural design, good structural versatility, and can adapt to both thermomagnetic adjustable and thermomagnetic non-adjustable structural forms. It can reduce production costs, has stable performance, and has good practicality.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breaker technology, specifically relating to a thermomagnetic molded case circuit breaker. Background Technology

[0002] Among low-voltage electrical appliances, molded case circuit breakers are a widely used product, frequently applied in low-voltage power distribution systems. They not only provide power to the distribution lines but also serve the dual purpose of protecting and controlling the circuits, playing a crucial role in the safety, reliability, and practicality of the entire power distribution system.

[0003] With the advancement of power distribution system technology, existing molded case circuit breakers (MCCBs) are generally divided into thermo-magnetic adjustable and thermo-magnetic non-adjustable structural forms due to different usage scenarios or requirements. However, these existing MCCBs often differ in their core mechanisms and protection methods, resulting in slight differences in the housing components used. Specifically, components of thermo-magnetic adjustable MCCBs cannot be installed and used in the housing of a thermo-magnetic non-adjustable MCCB. Conversely, components of a thermo-magnetic non-adjustable MCCB may experience connection problems or inability to install certain components properly after installation in the thermo-magnetic adjustable MCCB. Consequently, manufacturers need to stock different MCCB housing structures when manufacturing thermo-magnetic adjustable and non-thermo-magnetic non-adjustable MCCBs, leading to inventory pressure and higher production costs. Utility Model Content

[0004] The purpose of this utility model is to provide a thermomagnetic molded case circuit breaker with good structural versatility, which can be adapted to both thermomagnetic adjustable and thermomagnetic non-adjustable structural forms.

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

[0006] This utility model provides a thermomagnetic molded case circuit breaker, including a base, a cover fitted on the base, and a thermomagnetic tripping mechanism and a traction rod mounted on the base. The thermomagnetic tripping mechanism includes a bimetallic element, a thermal adjustment rod, an armature bracket, an armature, and an elastic reset element for armature reset. A thermomagnetic adjustable mechanism is detachably installed inside the base. The thermomagnetic adjustable mechanism includes a thermally adjustable mechanism and a magnetically adjustable mechanism. The magnetically adjustable mechanism includes a magnetic adjustment rod with a hook and a magnetically adjustable knob for adjusting the magnetic adjustment rod. The thermally adjustable rod can... The device is slidably mounted on the traction rod. The heat adjustment rod is arranged along the length of the traction rod. The heat-adjustable mechanism is located on one side of the heat adjustment rod and is used to drive the heat adjustment rod to move during the adjustment phase. The armature bracket is hinged to the armature so that the armature can swing relative to the armature bracket and release itself towards the heat adjustment rod. The armature has a suspension part on the side away from the heat adjustment rod. The armature bracket has a hook part. One end of the elastic reset member is connected to the suspension part, and the other end is selectively connected to either the hook part or the hook.

[0007] Preferably, the suspension part includes a first suspension part and a second suspension part. When the other end of the elastic reset member is connected to the hook part, one end of the elastic reset member is connected to the first suspension part; when the other end of the elastic reset member is connected to the hook, one end of the elastic reset member is connected to the second suspension part.

[0008] Preferably, the base is equipped with a support frame, and the thermally adjustable mechanism and the magnetically adjustable mechanism are both mounted on the upper end of the support frame. The base is provided with a support frame locking area, and the lower end of the support frame extends into the base and is engaged in the support frame locking area, forming a limit for the support frame within the base.

[0009] Preferably, the lower end of the support frame includes two support plates and a reinforcing plate connected between the two support plates, and the support plates are fixed to the support frame's snap-fit ​​area.

[0010] Preferably, the support frame locking area is a slot opened on the spacer plate in the base, the support plate is provided with an embedding part and a limiting part, the embedding part is inserted into the slot, and the lower part of the shell cover abuts against the limiting part.

[0011] Preferably, the base has a screw hole at the bottom, and the locking screw passes through the screw hole from bottom to top and is fixedly connected to the bottom end of the support plate.

[0012] Preferably, a pad is provided at the bottom of the base, and the pad is fixed between the thermomagnetic release mechanism and the inner bottom surface of the base, thereby raising the thermomagnetic release mechanism within the base.

[0013] Preferably, the heat-adjustable mechanism includes a heat-adjustable knob located on the support frame. A drive rod is eccentrically disposed at the lower end of the heat-adjustable knob. The drive rod rotates circumferentially with the heat-adjustable knob. The heat-adjustable rod includes a rod body connected to the traction rod, a stepped portion disposed on the rod body and close to the bimetallic element, and an adjustment portion disposed on the rod body. The drive rod is connected to the adjustment portion, forming a stage in which the drive rod rotates circumferentially with the heat-adjustable knob, synchronously driving the rod body to slide.

[0014] Preferably, the traction rod is provided with a strip-shaped sliding hole extending along its length, and the heat adjustment rod is provided with a limiting member that cooperates with the strip-shaped sliding hole. The limiting member includes a limiting rod portion that passes through the strip-shaped sliding hole and a limiting stop head located at the end of the limiting rod portion away from the heat adjustment rod. The limiting stop head is used to prevent the limiting member from disengaging from the traction rod.

[0015] Preferably, the elastic reset element is a tension spring.

[0016] The positive effects of this utility model are as follows: By optimizing the structure of the molded case circuit breaker, the thermomagnetic adjustable mechanism can be detachably connected to the base. In actual production, it can be selected according to customer needs. Circuit breakers that do not require thermomagnetic adjustment do not need to install the thermomagnetic adjustable mechanism. One end of the elastic reset member is connected to the suspension part, and the other end is connected to the hook part. Circuit breakers that require thermomagnetic adjustment function are equipped with the thermomagnetic adjustable mechanism. One end of the elastic reset member is connected to the suspension part, and the other end is connected to the hook. This increases the compatibility of the structure and makes the circuit breaker housing universal, thereby reducing production and inventory pressure and reducing production costs. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art are briefly introduced below. Similar elements or parts in the drawings are generally identified by similar reference numerals. The elements or parts in the drawings are not necessarily drawn to scale.

[0018] Figure 1 This is a three-dimensional schematic diagram of the thermomagnetic molded case circuit breaker of this utility model;

[0019] Figure 2 This is a schematic diagram of the thermomagnetic molded case circuit breaker of this utility model after the case cover has been removed;

[0020] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0021] Figure 4 This is a three-dimensional schematic diagram of the base in this utility model;

[0022] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0023] Figure 6 This is a three-dimensional schematic diagram of the thermomagnetic adjustable mechanism and the support frame in this utility model.

[0024] Figure 7 This is a partial schematic diagram of the thermomagnetic release mechanism, traction rod, and thermal adjustment rod combined in this utility model.

[0025] Figure 8 This is a schematic diagram of the structure of the thermomagnetic adjustable mechanism, the thermomagnetic release mechanism and the support frame in this utility model;

[0026] Figure 9 for Figure 8 Enlarged view of point C in the middle;

[0027] Figure 10 This is a schematic diagram of the heat adjustment rod (with a heat-adjustable knob) and the traction rod in the separated state of this utility model.

[0028] The reference numerals in the figure are as follows: 1. Shell cover; 2. Base; 20. Inner bottom surface; 21. Support frame locking area; 22. Phase spacer; 23. Screw hole; 3. Thermomagnetic release mechanism; 31. Armature; 311. Connecting shaft; 312. Hanging part; 313. Second suspension part; 314. First suspension part; 32. Armature bracket; 33. Thermal adjustment rod; 331. Stepped part; 332. Adjustment part; 333. Rod body; 334. Limit. Positioning components; 3341, Limiting rod; 3342, Limiting stop; 34, Bimetallic element; 4, Thermomagnetic adjustable mechanism; 41, Thermo-adjustable knob; 411, Drive rod; 42, Magnetic adjustable knob; 43, Support frame; 431, Support plate; 4311, Limiting part; 4312, Embedded part; 432, Reinforcing plate; 44, Magnetic adjustment rod; 441, Hook; 5, Traction rod; 51, Strip-shaped sliding hole; 52, Mounting through hole; 6, Pad block. Detailed Implementation

[0029] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0030] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0031] The structure of the thermomagnetic molded case circuit breaker in this embodiment of the utility model is as follows: Figures 1 to 10As shown, it includes a base 2, a cover 1 fitted onto the base 2, and a thermomagnetic release mechanism 3 and a traction rod 5 mounted on the base 2. The thermomagnetic release mechanism 3 includes a bimetallic element 34, a thermal adjustment rod 33, an armature bracket 32, an armature 31, a magnetic yoke 30, and an elastic reset member for resetting the armature 31. The armature bracket 32 ​​is hinged to the armature 31 so that the armature 31 can swing relative to the armature bracket 32. The magnetic yoke 30 is fixed on the armature bracket 32. The base... 2. A thermomagnetically adjustable mechanism 4 is detachably installed inside. The thermomagnetically adjustable mechanism 4 includes a thermo-adjustable mechanism and a magnetically adjustable mechanism. The magnetically adjustable mechanism includes a magnetic adjustment rod 44 with a hook 441 and a magnetically adjustable knob 42 for adjusting the magnetic adjustment rod 44. By rotating the magnetically adjustable knob 42, the magnetic adjustment rod 44 is controlled to rotate by a certain angle, thereby changing the tension of the reset elastic element on the armature 31 to achieve the purpose of magnetic adjustment. The cooperation method between the magnetically adjustable knob 42 and the magnetic adjustment rod 44 is existing technology. The technique is not elaborated here; the heat adjustment rod 33 is slidably mounted on the traction rod 5. The heat adjustment rod 33 is set along the length of the traction rod 5. The heat adjustable mechanism is located on one side of the heat adjustment rod 33 and is used to drive the heat adjustment rod 33 to move during the adjustment phase. In actual application, when a short circuit fault occurs in the line, the magnetic yoke 30 acts on the armature 31 to make it swing, and then the upper end of the armature 31 touches the heat adjustment rod 33 to make the traction rod 5 move, thereby controlling the circuit breaker to trip; when an overload fault occurs in the line, the bimetallic element 34 bends and deforms, and then the upper end of the bimetallic element 34 touches the heat adjustment rod 33 to make the traction rod 5 move, thereby controlling the circuit breaker to trip; furthermore, a suspension part is provided on the side of the armature 31 that is away from the heat adjustment rod 33, and a hook part 312 is provided on the armature bracket 32. One end of the elastic reset member is connected to the suspension part, and the other end is selectively connected to the hook part 312 and the hook 441; the elastic reset member is preferably a tension spring.

[0032] In this embodiment, the structure of the molded case circuit breaker is optimized so that the thermomagnetic adjustable mechanism can be detachably connected to the base. In actual production, it can be selected according to customer needs. In circuit breakers that do not require thermomagnetic adjustment, the thermomagnetic adjustable mechanism is not installed (such as without magnetic adjustment rod and thermal adjustment rod), and one end of the elastic reset member is connected to the suspension part and the other end is connected to the hook part. In circuit breakers that require thermomagnetic adjustment function, the thermomagnetic adjustable mechanism is installed, and one end of the elastic reset member is connected to the suspension part and the other end is connected to the hook 441. This increases the compatibility of the structure and makes the circuit breaker housing universal, thereby reducing production and inventory pressure and reducing production costs.

[0033] like Figure 3 , 6As shown in Figures 8-9, the suspension part includes a first suspension part 314 and a second suspension part 313. When the other end of the elastic reset member is connected to the hook part 312, one end of the elastic reset member is connected to the first suspension part 314; when the other end of the elastic reset member is connected to the hook 441, one end of the elastic reset member is connected to the second suspension part 313. By connecting the spring reset member to the first suspension part 314 and the second suspension part 313 at different positions in both thermomagnetically adjustable and thermomagnetically non-adjustable styles, the elastic reset member is maintained in a more reasonable direction of elastic force transmission, which is beneficial to the reset of the armature.

[0034] like Figures 3 to 6 ,and Figure 8 As shown, the base 2 is equipped with a support frame 43. The thermally adjustable mechanism and the magnetically adjustable mechanism are both mounted on the upper end of the support frame 43. The base 2 is provided with a support frame locking area 21. The support frame 43 is embedded in the support frame locking area 21, forming a limited installation of the support frame 43 in the base 2. In this way, the thermally and magnetically adjustable mechanism 4 can be reliably installed in the base 2.

[0035] like Figure 6 As shown, the lower end of the support frame 43 includes two support plates 431 and a reinforcing plate 432 connected between the two support plates 431. The two support plates 431 are connected by the reinforcing plate 432 to form a whole, thereby enhancing the structural strength of the support frame 43. The two support plates 431 are fixed to the support frame locking area 21, thereby forming a stable limit on the support frame 43.

[0036] See further Figures 4 to 6 As shown, the support frame locking area 21 is a slot opened on the spacer plate 22 in the base 2. The support plate 431 has an embedding part 4312 on its side and a limiting part 4311 at its upper end. During assembly, the embedding part 4312 is inserted into the slot. When the cover 1 is closed on the base 2, the lower part of the cover 1 presses against the limiting part 4311, thereby reliably limiting the support frame 43.

[0037] See Figure 5 In order to strengthen the fixed connection between the support frame and the base 2, a screw hole 23 is provided at the bottom of the base 2. The locking screw is passed through the screw hole 23 from bottom to top and fixedly connected to the bottom end of the support plate 431 to lock the support frame 43, so as to ensure a reliable connection between the support frame 43 and the base 2 and prevent the support frame 43 from loosening.

[0038] like Figure 8As shown, a pad 6 is provided at the bottom of the base 2. The pad 6 is placed between the thermomagnetic tripping mechanism 3 and the bottom surface 20 of the base 2. The pad 6 raises the thermomagnetic tripping mechanism 3 distributed in the base 2, ensuring that the thermomagnetic tripping mechanism 3 and the thermomagnetic adjustable mechanism 4 are highly matched, thus ensuring the performance of the circuit breaker.

[0039] like Figure 2-3 As shown in Figures 7-9, the heat-adjustable mechanism includes a heat-adjustable knob 41 located on the support frame 43. A drive rod 411 is eccentrically disposed at the lower end of the heat-adjustable knob 41. The drive rod 411 rotates circumferentially with the heat-adjustable knob 41. The heat-adjusting rod 33 includes a rod body 333 connected to the traction rod 5, a stepped portion 331 disposed on the rod body 333 and near the bimetallic element 34, and an adjusting portion 332 disposed on the rod body 333. The drive rod 411 is connected to the adjusting portion 332 and forms a drive rod. When the heat-adjustable knob 41 rotates circumferentially, it drives the rod 333 (heat adjustment rod 33) to slide, thereby adjusting the relative position between the stepped part 331 and the bimetallic element. This allows the heat adjustment rod 33 to be activated by different deformations of the bimetallic element 34, which in turn controls the movement of the traction rod 5, thus achieving the purpose of heat adjustment. For example, a slot is provided on the adjustment part 332, and the drive rod 411 is inserted into the slot. When the heat-adjustable knob 41 rotates, the drive rod 411 moves the heat adjustment rod 33.

[0040] like Figure 10 As shown, the traction rod 5 is provided with a strip-shaped sliding hole 51 extending along its length direction. The heat adjustment rod 33 is provided with a limiting member 334 that cooperates with the strip-shaped sliding hole 51. The limiting member 334 includes a limiting rod portion 3341 that passes through the strip-shaped sliding hole 51 and a limiting stop 3342 located at the end of the limiting rod portion 3341 away from the heat adjustment rod 33. The limiting stop 3342 is used to prevent the limiting member 334 from disengaging from the traction rod 5, so that the heat adjustment rod 33 is reliably connected to the traction rod 5. In this embodiment, the limiting member 334 and the heat adjustment rod 33 are integrally connected. An installation through hole 52 is provided on the traction rod 5. The installation through hole 52 is connected to one end of the strip-shaped sliding hole 51. During assembly, the limiting stop 3342 passes through the installation through hole 52, so that the limiting rod portion 3341 enters the strip-shaped through hole 51, which facilitates assembly. As another implementation, in actual operation, the limiting member 334 can also be connected to the heat adjustment rod 33 by assembly (such as snap-fit). During the organization, the limiting rod 3341 is passed through the strip-shaped sliding hole 51 and then fixedly connected to the traction rod 5.

[0041] For those skilled in the art, other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, these obvious variations or modifications derived from the essential spirit of this invention still fall within the scope of protection of this invention.

Claims

1. A thermomagnetic molded case circuit breaker, comprising a base (2), a case cover (1) fitted on the base (2), and a thermomagnetic tripping mechanism (3) and a traction rod (5) mounted on the base (2), wherein the thermomagnetic tripping mechanism (3) comprises a bimetallic element (34), a thermal adjustment rod (33), an armature bracket (32), an armature (31), and an elastic reset member for resetting the armature (31), wherein the armature bracket (32) is hinged to the armature (31) so that the armature (31) can swing relative to the armature bracket (32); a thermomagnetic adjustable mechanism (4) is detachably installed inside the base (2), wherein the thermomagnetic adjustable mechanism (4) comprises a thermally adjustable mechanism and a magnetically adjustable mechanism, wherein the magnetically adjustable mechanism comprises a magnetic adjustment rod (44) having a hook (441) and a magnetically adjustable knob (42) for adjusting the magnetic adjustment rod (44); characterized in that: The heat adjustment rod (33) is slidably mounted on the traction rod (5). The heat adjustment rod (33) is arranged along the length of the traction rod (5). The heat adjustable mechanism is located on one side of the heat adjustment rod (33) and is used to drive the heat adjustment rod (33) to move during the adjustment phase. The armature (31) has a suspension part on the side away from the heat adjustment rod (33). The armature bracket (32) has a hook part (312). One end of the elastic reset member is connected to the suspension part, and the other end is selectively connected to the hook part (312) and the hook (441).

2. The thermomagnetic molded case circuit breaker according to claim 1, characterized in that: The suspension part includes a first suspension part (314) and a second suspension part (313). When the other end of the elastic reset member is connected to the hook part (312), one end of the elastic reset member is connected to the first suspension part (314); when the other end of the elastic reset member is connected to the hook (441), one end of the elastic reset member is connected to the second suspension part (313).

3. The thermomagnetic molded case circuit breaker according to claim 1, characterized in that: The base (2) is equipped with a support frame (43). The thermally adjustable mechanism and the magnetically adjustable mechanism are both installed on the upper end of the support frame (43). The base (2) is provided with a support frame locking area (21). The lower end of the support frame (43) extends into the base (2) and is locked in the support frame locking area (21), forming a limit for the support frame (43) within the base (2).

4. The thermomagnetic molded case circuit breaker according to claim 3, characterized in that: The lower end of the support frame (43) includes two support plates (431) and a reinforcing plate (432) connected between the two support plates (431), and the support plates (431) are fixed to the support frame snap-fit ​​area (21).

5. The thermomagnetic molded case circuit breaker according to claim 4, characterized in that: The support frame locking area (21) is a slot opened on the spacer plate (22) in the base (2). The support plate (431) is provided with an embedding part (4312) and a limiting part (4311). The embedding part (4312) is inserted into the slot, and the lower part of the shell cover (1) presses against the limiting part (4311).

6. The thermomagnetic molded case circuit breaker according to claim 4, characterized in that: The base (2) has a screw hole (23) at the bottom. The locking screw passes through the screw hole (23) from bottom to top and is fixedly connected to the bottom end of the support plate (431).

7. The thermomagnetic molded case circuit breaker according to claim 1, characterized in that: The base (2) has a pad (6) at its bottom. The pad (6) is fixed between the thermomagnetic release mechanism (3) and the inner bottom surface (20) of the base (2). The pad (6) forms a height increase for the thermomagnetic release mechanism (3) within the base (2).

8. The thermomagnetic molded case circuit breaker according to claim 3, characterized in that: The heat-adjustable mechanism includes a heat-adjustable knob (41) located on a support frame (43). A drive rod (411) is eccentrically provided at the lower end of the heat-adjustable knob (41). The drive rod (411) rotates circumferentially with the heat-adjustable knob (41). The heat adjustment rod (33) includes a rod body (333) connected to the traction rod (5), a stepped portion (331) on the rod body (333) and close to the bimetallic element (34), and an adjustment portion (332) distributed on the rod body (333). The drive rod (411) is connected to the adjustment portion (332), forming a stage in which the drive rod (411) rotates circumferentially with the heat-adjustable knob (41), synchronously driving the rod body (333) to slide.

9. The thermomagnetic molded case circuit breaker according to claim 1, characterized in that: The traction rod (5) is provided with a strip-shaped sliding hole (51) extending along its length direction. The heat adjustment rod (33) is provided with a limiting member (334) that cooperates with the strip-shaped sliding hole (51). The limiting member (334) includes a limiting rod portion (3341) that passes through the strip-shaped sliding hole (51) and a limiting stop (3342) located at the end of the limiting rod portion (3341) away from the heat adjustment rod (33). The limiting stop (3342) is used to prevent the limiting member (334) from disengaging from the traction rod (5).

10. The thermomagnetic molded case circuit breaker according to claim 1, characterized in that: The elastic reset element is a tension spring.

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