TW202422609A - Miniature circuit breaker dual independent loop mechanism - Google Patents

Abstract

A dual independent circuit mechanism for a miniature circuit breaker is applied to the miniature circuit breaker. The miniature circuit breaker includes a bottom plate, a cover plate and a middle plate. The bottom plate is hinged with a handle and combined with the cover plate. The middle plate is equipped with a coil, two fixed terminals and two arc extinguishing chambers. The dual independent circuit mechanism for a miniature circuit breaker includes: a return assembly installed in the miniature circuit breaker. The return assembly includes a return rod. The return rod is provided with a tripping pull rod and a Torsion spring, an upper connecting rod is installed above the return rod; two mechanism components are installed on the front and rear sides of the return assembly, the upper connecting rod is pivoted between the mechanism components, the mechanism component includes a support seat, the support seat is pivoted with a movable member, the movable member is provided with a tension spring, the mechanism component also has a main shaft and a trip rod rotating shaft fixed to the bottom plate, the two support seats are sleeved on the main shaft, the two support seats and the return rod are sleeved on the trip rod rotating shaft.

Description

Miniature circuit breaker dual independent loop mechanism

The present invention relates to a dual independent loop mechanism of a miniature circuit breaker.

Miniature circuit breakers are an important component for protecting electrical appliances. They are mainly used for short circuit protection and to prevent severe overload. They can be applied to main switches and current distribution control switches used in wiring. Circuit breakers are also used as one of the protective devices for motor load line protection on industrial machinery. When the circuit breaker detects problems such as short circuit, leakage or severe overload, the circuit breaker can immediately trip to protect the line and electrical appliances.

One type of miniature circuit breaker is a double-circuit miniature circuit breaker, which uses two torsion springs plus a compression spring, and combines a return rod, a support seat, a movable element and other components to form a mechanism for synchronous operation, but has the following problems:

1. The support seat and the movable element are connected by a torsion spring and then inserted into the main support point. However, because the torsion spring force is not linear, the movable element cannot be smoothly engaged with the contact point every time when it is put into use, resulting in poor contact and unstable contact pressure, which causes the temperature to rise.

2. The return rod is inserted into the fulcrum of the support seat, and the other leg of the return rod is then engaged with the fulcrum of the support seat. However, the clearance between the return rod and the support seat is large, which makes the return rod likely to flip over, causing the hanging metal to be unable to be fixed, and the jump-off formation is unstable, affecting the short-circuit characteristics and jump-off characteristics.

3. The return rod is fixed on the other fulcrum of the support seat, which is inconsistent with the support point of the mechanism, and the other fulcrum of the support seat is far away from the support point of the mechanism, so the return rod has a large rotation angle and a large jump-out stroke. The bending stroke of the two alloy plates cannot meet it, making the jump-out stroke unstable.

4. The mechanism is driven by a compression spring. Because the compression is too large and biased toward the base, the mechanism is prone to flipping, resulting in unstable movement.

The above problems will make the circuit breaker mechanism unstable, which may cause poor insulation withstand voltage in the short-circuit test, making it impossible to increase the short-circuit capacity, and the poor reproducibility of the trip test will be more labor-intensive and time-consuming. At the same time, there are also shortcomings such as difficulty in mechanism assembly and high assembly cost.

Taking into account the above reasons, there is still room for improvement in the known technology. In view of this, the inventor has actively conducted research and combined with many years of experience in related product development, and after continuous testing and improvement, he finally developed the present invention.

The main purpose of the present invention is to provide a dual independent circuit mechanism for a miniature circuit breaker, which can stabilize the mechanism action of the circuit breaker, improve the circuit breaking capacity, and reduce assembly time and assembly cost.

In order to achieve the above-mentioned purpose, the present invention provides a dual independent circuit mechanism for a miniature circuit breaker, which is applied to a miniature circuit breaker. The miniature circuit breaker includes a bottom plate, a cover plate is installed on the front end surface of the bottom plate, a middle plate is installed between the bottom plate and the cover plate, the bottom plate is hinged with a handle and combined with the cover plate, the middle plate is installed with a coil, and the coil has two fixed terminals and two arc extinguishing chambers adjacent to the coil, which are respectively installed on the front and rear sides of the middle plate, that is, corresponding to the bottom plate and the cover plate respectively.

The dual independent circuit mechanism of the miniature circuit breaker includes: a return assembly installed in the miniature circuit breaker, the return assembly includes a return rod, the return rod is provided with a tripping pull rod and a torsion spring, an upper connecting rod is installed above the return rod and is engaged with the return rod; two mechanism assemblies are installed on the front and rear sides of the return assembly, the mechanism assemblies are connected to the upper connecting rod, and the mechanism assembly It includes a support seat, the support seat is pivoted with a movable member, the movable member corresponds to the contact points of the two fixed terminals, the movable member is provided with a tension spring, and the two ends of the tension spring are respectively fixed to the movable member and the base plate, the mechanism assembly also has a main shaft and a trip rod rotating shaft fixed to the base plate, the two support seats are sleeved on the main shaft, and the two support seats and the return rod are sleeved on the trip rod rotating shaft.

In order to make the purpose, features and advantages of the present invention easier to understand for those with ordinary knowledge in this field, a preferred embodiment is given below, and a detailed description is given in conjunction with the attached drawings.

10: Base plate

11: Cover plate

12: Middle plate

13:Handle

14: Coil

15:Fixed terminal

16: Arc extinguishing chamber

20:Restore components

21: Return rod

22: Jump off the pull rod

23: Torsion spring

24: Upper connecting rod

30: Mechanical components

31: Support seat

32: Movable

33: Extension spring

34: Main axis

35: Escapement rod shaft

Figure 1 is a three-dimensional schematic diagram of the cover plate of the miniature circuit breaker being separated.

Figure 2 is a three-dimensional exploded view of the micro circuit breaker and the present invention.

Figure 3 is a front view of the miniature circuit breaker.

Figure 4 is a three-dimensional exploded view of the dual independent loop mechanism of the miniature circuit breaker of the present invention.

Please refer to Figures 1 and 4. The present invention relates to a dual independent circuit mechanism for a miniature circuit breaker, which is applied to a miniature circuit breaker. The miniature circuit breaker includes a bottom plate 10, a cover plate 11 is installed on the front end surface of the bottom plate 10, a middle plate 12 is installed between the bottom plate 10 and the cover plate 11, the bottom plate 10 is pivotally connected to a handle 13 and combined with the cover plate 11, and the middle plate 12 is installed with a coil 14, and the coil 14 has two adjacent fixed terminals 15 and two arc extinguishing chambers 16 respectively installed on the front and rear sides of the middle plate 12, that is, corresponding to the bottom plate 10 and the cover plate 11 respectively.

The dual independent circuit mechanism of the miniature circuit breaker includes: a return assembly 20 installed in the miniature circuit breaker, the return assembly 20 includes a return rod 21, the return rod 21 is provided with a tripping pull rod 22 and a torsion spring 23, and an upper connecting rod 24 is installed above the return rod 21 and is engaged with the return rod 21.

Two mechanism assemblies 30 are installed on the front and rear sides of the return assembly 20. The upper connecting rod 24 is pivoted between the mechanism assemblies 30. The mechanism assembly 30 includes a support seat 31. The support seat 31 is pivoted with a movable member 32. The movable member 32 corresponds to the contact points of the two fixed terminals 15. The movable member 32 is provided with a tension spring 33, and the two ends of the tension spring 33 are respectively fixed to the movable member 32 and the bottom plate 10. The mechanism assembly 30 also has a main shaft 34 and a trip rod rotating shaft 35 fixed to the bottom plate 10. The two support seats 31 are sleeved on the main shaft 34. The two support seats 31 and the return rod 21 are sleeved on the trip rod rotating shaft 35.

With the above structure, the dual independent loop mechanism of the miniature circuit breaker of the present invention has the following characteristics:

1. The support seat 31 is riveted onto the main shaft 34, thereby being able to precisely control the size and concentricity of the components and ensure the stability of the mechanism.

2. The return rod 21 is centered and sleeved on the trip rod shaft 35, which can ensure smooth rotation and balance during tripping.

3. The tension spring 33 is independently set in each of the mechanism components 30, and the function of the two torsion springs plus the compression spring in the known technology is combined with the tension spring 33, so that the two movers 32 are evenly stressed and the mechanism is not easy to deflect. Since the mechanism action is centered, it will not flip, making the contact pressure and tripping characteristics stable, thereby improving the short-circuit capacity.

4. The mechanical components in the miniature circuit breaker are assembled from the bottom up and can be assembled automatically to save assembly time and reduce costs.

In summary, the dual independent circuit mechanism of the miniature circuit breaker of the present invention can stabilize the mechanism action of the circuit breaker, improve the circuit breaking capacity, and reduce the assembly time and assembly cost.

Although the present invention has been disclosed as above with the preferred embodiment, it is not used to limit the present invention. Anyone familiar with this technology can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the attached patent application.

10: Base plate

11: Cover plate

12: Middle plate

13:Handle

14: Coil

15:Fixed terminal

16: Arc extinguishing chamber

20:Restore components

21: Return rod

22: Jump off the pull rod

23: Torsion spring

24: Upper connecting rod

30: Mechanical components

31: Support seat

32: Movable

33: Extension spring

34: Main axis

35: Escapement rod shaft

Claims (1)

A dual independent circuit mechanism for a miniature circuit breaker is applied in a miniature circuit breaker. The miniature circuit breaker includes a bottom plate, a cover plate is installed on the front end surface of the bottom plate, a middle plate is installed between the bottom plate and the cover plate, the bottom plate is hinged with a handle and combined with the cover plate, the middle plate is installed with a coil, the coil has two adjacent fixed terminals and two arc extinguishing chambers respectively installed on the front and rear sides of the middle plate, that is, respectively corresponding to the bottom plate and the cover plate; The dual independent loop mechanism of the miniature circuit breaker includes: A return assembly is installed in the miniature circuit breaker, the return assembly includes a return rod, the return rod is provided with a tripping pull rod and a torsion spring, and an upper connecting rod is installed above the return rod and engages with the return rod; and Two mechanism components are installed on the front and rear sides of the return component. The upper connecting rod is pivoted between the mechanism components. The mechanism component includes a support seat, and the support seat is pivoted with a movable member. The movable member corresponds to the contact points of the two fixed terminals. The movable member is provided with a tension spring, and the two ends of the tension spring are respectively fixed to the movable member and the bottom plate. The mechanism component also has a main shaft and a trip rod rotating shaft fixed to the bottom plate. The two support seats are sleeved on the main shaft, and the two support seats and the return rod are sleeved on the trip rod rotating shaft.

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