Draw bar and molded case circuit breaker

Abstract

A draw bar and a molded case circuit breaker are suitable for a circuit breaker, and the draw bar comprises a bar shaft which is rotatably arranged with an operating mechanism of the circuit breaker; the main body part is provided with a mounting hole formed in the length direction of the main body part, the rod shaft is arranged in the mounting hole in a penetrating mode, and an observation opening used for observing the position of the rod shaft is formed in one end of the main body part. The installation holes are arranged in a closed mode so that the draw bars can be totally closed in an interphase mode, hidden dangers of interphase insulation breakdown are avoided, meanwhile, whether the internal bar shaft is installed in place or not can be directly observed through the observation opening formed in one end, and the disengagement phenomenon caused by the fact that the bar shaft is not installed in place is avoided.

Description

Technical Field

[0001] The utility model specifically relates to a drawbar and a molded case circuit breaker. Background Technique

[0002] The operating mechanism is one of the important components of a molded case circuit breaker, and is composed of a bracket, a drawbar, a reclosing latch, a locking latch, a tripping latch, a connecting rod, a rocker arm, etc. Among them, the operating mechanism realizes opening and closing through the cooperation of the drawbar with the locking latch and the tripping latch. For example, for a circuit breaker with overload protection, the bimetallic part generates heat and deformation to push the drawbar, and the drawbar rotates under the push of the bimetallic part, so that the locking latch and the tripping latch are unlocked, realizing the tripping of the operating mechanism.

[0003] At present, the drawbar is generally fixed on the bracket of the operating mechanism through a rotating shaft, so that the drawbar has a degree of freedom of rotation around its axis direction. To limit the relative displacement between the rotating shaft and the drawbar body and prevent the rotating shaft from falling off the drawbar body, generally, silicone is applied to the end of the rotating shaft, and the rotating shaft is fixed in the assembly groove of the drawbar body.

[0004] When designing the drawbar, due to problems such as phase spacing, insulation, and installation and fixation, there are often situations where the drawbar is easy to install and fix, but the phase insulation is difficult to pass, or the phase insulation is easy to pass, but the installation is difficult. The currently commonly used drawbars in the industry are the following two methods:

[0005] 1. Phase-interval closed installation method:

[0006] The drawbar shaft (metal part) is inserted into the drawbar from the right side, and the drawbar, the reclosing latch and the mechanism are linked. There is no exposed metal between the phases, and the phase insulation is very good. After the assembly is completed, in order to prevent the drawbar shaft from withdrawing during operation, an appropriate amount of silicone is applied to block the right port of the drawbar. Since the drawbar shaft is hidden inside, it is not easy to identify whether the installation is in place.

[0007] 2. Phase-interval open installation method:

[0008] The drawbar shaft (metal part) is inserted into the drawbar from the right side, and the drawbar, the drawbar copper sheet and the mechanism are linked. There is exposed metal between the phases, and the phase insulation is poor, which is likely to cause phase breakdown. After the assembly is completed, in order to prevent the drawbar shaft from withdrawing during operation, the right side of the drawbar shaft is bent and stuck in the corresponding groove, and then an appropriate amount of silicone is applied to block it.

[0009] As disclosed in a polyphase circuit breaker of Chinese Patent CN221176121U, it adopts an open installation method between phases. After the drawbar shaft is inserted into the drawbar, each phase is in an exposed state, resulting in poor insulation between phases. In order to improve the insulation between phases, multiple base partitions are provided on the base, and multiple middle cover partitions are provided on the middle cover, so that there is a base partition and a middle cover partition between every two adjacent phases to achieve electrical isolation between two adjacent phases in the polyphase circuit breaker. However, there is an open space at the back for each of the A, B, and C phases, and there is still a risk of insulation breakdown due to interphase conduction.

[0010] While adopting the closed installation method between phases can avoid the design of the open space at the back of the A phase and the C phase (the B phase cannot be made closed due to technological reasons), since it is impossible to directly observe whether the drawbar shaft is inserted in place, one can only rely on the feel to determine whether the drawbar shaft has been installed in place, and there is a risk of it coming out. Utility Model Content

[0011] Aiming at the deficiencies of the prior art, the purpose of the present utility model is a drawbar and a molded case circuit breaker.

[0012] To achieve the above object, the present utility model provides the following technical solutions:

[0013] A drawbar applicable to a circuit breaker, comprising:

[0014] A rod shaft rotatably arranged with the operating mechanism of the circuit breaker;

[0015] A main body portion having an installation hole provided along the length direction of the main body portion, the rod shaft passing through the installation hole, and an observation opening for observing the position of the rod shaft being provided at one end of the main body portion.

[0016] A plurality of plate-like structures adapted to the phases are provided on the main body portion at intervals along the length direction of the main body portion.

[0017] A plurality of isolation components are provided on the main body portion, and the isolation components are located between each phase.

[0018] The isolation component is two isolation ribs spaced apart on the surface of the main body portion.

[0019] A fitting groove adapted to the partition of the base of the circuit breaker is formed between the two isolation ribs.

[0020] Hook portions adapted to the draw springs of the operating mechanism are provided on both sides of the main body portion at the middle phase.

[0021] The opening direction of the observation opening is the same as the extending direction of the plate-like structure.

[0022] One end of the rod shaft is provided with a limiting part.

[0023] A molded case circuit breaker includes a base and an upper cover. An operating mechanism is provided in the base, and the operating mechanism is rotatably connected to the base through the above-mentioned traction rod.

[0024] Several phases are provided in the base, and limiting grooves are provided between the phases. The traction rod is placed in the limiting grooves, and the isolating components of the traction rod are located on both sides of the limiting grooves.

[0025] The beneficial effects of the present utility model: The installation holes with a closed structure can make the traction rod fully enclosed between phases without leaving hidden dangers of insulation breakdown between phases. At the same time, the observation opening provided at one end can directly observe whether the internal rod shaft is installed in place, avoiding the phenomenon of detachment caused by improper installation. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of Embodiment 1 of the traction rod.

[0027] Figure 2 It is a front view of Embodiment 1 of the traction rod.

[0028] Figure 3 It is for Figure 2 The schematic cross-sectional view at A-A in

[0029] Figure 4 It is a schematic structural diagram of Embodiment 2 of the traction rod.

[0030] Figure 5 It is a schematic internal view of the molded case circuit breaker.

[0031] Figure 6 It is for Figure 5 The enlarged schematic view at B in Detailed Embodiments

[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0034] As shown Figure 1 , Figure 2 and Figure 3 , Embodiment 1 is disclosed, which specifically discloses a traction rod for a three-phase circuit breaker. The three phases are phases A, B, and C, and it is composed of a main body part and a rod shaft inserted into the main body part.

[0035] The rod shaft 200 is rotatably arranged with the operating mechanism of the circuit breaker;

[0036] The main body part 100 has a mounting hole 160 arranged along the length direction of the main body part 100. The rod shaft 200 is inserted into the mounting hole 160, and an observation opening 150 for observing the position of the rod shaft 200 is provided at one end of the main body part 100.

[0037] The insertion direction of the rod shaft is as shown by the arrow in Figure 3 , generally inserted from right to left.

[0038] A number of plate-like structures 110 that cooperate with the phases are provided on the main body part 100 at intervals along the length direction of the main body part 100. The plate-like structure 110 is designed as an impact plate. When the impact plate receives an impact force, it will drive the traction rod to release the limit with the operating mechanism and generate a tripping action.

[0039] A number of isolation components are provided on the main body part 100, and the isolation components are located between each phase. Since the position of phase B cannot be completely enclosed due to process problems, isolation components are used to increase the creepage distance between each phase, greatly enhancing the phase-to-phase insulation performance, and the traction rod is easy to install and has high production efficiency.

[0040] The isolation components are two isolation ribs 120 arranged at intervals on the surface of the main body part. At the same time, they can also be plate-like structures, and their sizes and shapes can be changed according to requirements.

[0041] A fitting groove 140 adapted to the partition of the base of the circuit breaker is formed between the two isolation ribs 120. The fitting groove is directly fitted with the limit groove on the partition, that is, inserted and arranged, to increase the creepage distance between two phases.

[0042] Hook portions 130 that cooperate with the tension springs of the operating mechanism are provided on both sides of the main body part 100 at the middle phase position. The hook portions 130 are used to hold the tension springs.

[0043] The opening direction of the observation opening 150 is the same as the extending direction of the plate-like structure 110. Furthermore, the plate-like structure will not block the observation opening, so that there will be no line-of-sight obstruction when observing whether the rod shaft has been inserted in place. At the same time, after installation is completed, the opening can be sealed by applying silicone, which not only achieves the isolation effect but also can prevent the rod shaft from moving.

[0044] One end of the rod shaft 200 is provided with a limiting part 210. The design of the limiting part can, on the one hand, facilitate better observation, and on the other hand, play a certain limiting role during insertion to ensure that it will not be inserted excessively.

[0045] As Figure 4 shown, the present utility model also discloses a traction rod for a 4-phase circuit breaker, which is characterized in that four plate-like structures are provided on its main body part. In order to facilitate better observation, the observation opening is always arranged near the B-phase position, that is, on the main body part at the C-phase position.

[0046] As Figure 5 and Figure 6 shown, the present utility model also discloses a molded case circuit breaker, which includes a base and an upper cover. The buckling of the base 300 and the upper cover forms a housing with an accommodation cavity. A plurality of phases are arranged in the housing, and each phase needs to be set separately. Therefore, a base partition is provided in the base 300, and an upper cover partition is provided on the upper cover to divide the accommodation cavity into a plurality of sub-spaces. One phase corresponds to one sub-space, and electrical isolation between adjacent two phases is achieved through the upper cover partition and the base partition. At the same time, an operating mechanism is also provided in the accommodation cavity, and the operating mechanism is rotatably connected to the base 300 through the above-mentioned traction rod.

[0047] The traction rod is a long strip-shaped structure that can penetrate through multiple sub-spaces, and it has a plate-like structure corresponding to each phase, so that the tripping device can be connected to multiple phases, thereby realizing the on-off control of the current in multiple phases.

[0048] A number of phases are provided in the base 300, and limiting grooves 310 are provided between the respective phases. The traction rod is placed in the limiting grooves, and the isolation components of the traction rod are located on both sides of the limiting grooves, playing an effect of restricting the left and right movement of the traction rod.

[0049] The embodiments should not be regarded as limiting the present utility model, but any improvement based on the spirit of the present utility model should be within the protection scope of the present utility model.

Claims

1. A traction rod, suitable for a circuit breaker, characterized in that: It includes: A rod shaft (200) rotatably arranged with the operating mechanism of the circuit breaker; The main body (100) has a mounting hole (160) arranged along the length direction of the main body (100), the rod shaft (200) is inserted into the mounting hole (160), and an observation opening (150) for observing the position of the rod shaft (200) is provided at one end of the main body (100).

2. A traction rod according to claim 1, characterized in that: The main body (100) is provided with a plurality of plate-like structures (110) arranged at intervals along the length direction of the main body (100) and in phase with each other.

3. A traction rod according to claim 1 or 2, characterized in that: A plurality of isolation components are provided on the main body (100), and the isolation components are located between each phase.

4. A traction rod according to claim 3, characterized in that: The isolation component is two isolation ribs (120) arranged at intervals on the surface of the main body.

5. A traction rod according to claim 4, characterized in that: A matching groove (140) adapted to a partition plate of a base of the circuit breaker is formed between the two isolation ribs (120).

6. A traction rod according to claim 1, characterized in that: Hooking portions (130) cooperating with tension springs of the operating mechanism are provided on both sides of the main body (100) at the middle phase.

7. A traction rod according to claim 2, characterized in that: The opening direction of the observation opening (150) is consistent with the extension direction of the plate-like structure (110).

8. A traction rod according to claim 2, characterized in that: A limiting portion (210) is provided at one end of the rod shaft (200).

9. A molded case circuit breaker, characterized in that: It comprises a base and an upper cover, wherein an operating mechanism is provided in the base (300), and the operating mechanism is rotatably connected to the base (300) via the traction rod described in any one of claims 1 to 8.

10. A molded case circuit breaker according to claim 9, characterized in that: The base (300) is provided with a plurality of phases, and a limiting groove (310) is provided between each phase, the traction rod is placed in the limiting groove, and the isolation components of the traction rod are located on both sides of the limiting groove.

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