WO2017121164A1

WO2017121164A1 - Operation mechanism for miniature circuit breaker

Info

Publication number: WO2017121164A1
Application number: PCT/CN2016/103018
Authority: WO
Inventors: 杨峰; 江玉坤; 司莺歌; 黄东林; 唐皓
Original assignee: 浙江正泰电器股份有限公司
Priority date: 2016-01-11
Filing date: 2016-10-24
Publication date: 2017-07-20
Also published as: RU2716012C2; EP3404691A1; EP3404691A4; BR112018014124A2; MY191683A; RU2018129468A; CN106960768B; EP3404691B1; RU2018129468A3; PH12018501494A1; CN106960768A

Abstract

An operation mechanism for a miniature circuit breaker comprises a handle, a driving connecting rod, a stationary contact and a moving contact, and further comprises a tension spring and a trip lever. One end of the driving connecting rod is hinged to the handle, and the other end of the driving connecting rod matches with the moving contact. One end of the tension spring is fixed to a housing, and the other end of the tension spring is connected to the moving contact. The moving contact is driven by the tension spring and the driving connecting rod together to provide a contact pressure and an overstretching elastic force required for ensuring the reliability of electrical contact for connecting the moving contact and the stationary contact. In addition, the tension spring provides an energy storage elastic force required for resetting the mechanism for disconnecting the moving contact from the stationary contact. The trip lever is disposed on the moving contact, and is configured to control locking and unlocking between the driving connecting rod and the moving contact. When a fault occurs, the trip lever separates the driving connecting rod from the moving contact to automatically release the operation mechanism. The mechanism can effective simplify the structure, reduce the manufacturing cost, improve the production efficiency, and optimize the mechanical performance.

Description

Operating mechanism of miniature circuit breaker

Technical field

The invention relates to an operating mechanism of a miniature circuit breaker, in particular to an operating mechanism of a low-voltage molded shell type modularized miniature circuit breaker, and belongs to the field of low-voltage electrical appliances.

Background technique

As is known, the operating mechanism of the miniature circuit breaker is used to drive the breaking/closing of the moving contact and the static contact, and through the breaking/closing, the closing, opening and tripping of the circuit breaker are controlled. The four-bar linkage mechanism is the most typical and most commonly used mechanism of the operation mechanism of the existing miniature circuit breaker, and includes a handle connected to the transmission link to constitute a toggle joint; and a movable contact support device having a rotatably mounted device A pivoting plate on the pivot; and a mechanical interlock (also commonly referred to as locking) that can be broken by the action of the trip bar, the bimetal being connected to the trip bar by a rotating link having a one-way drive. The above mechanical interlock is formed by a stop of the trip bar and a latch (also commonly referred to as a lever) that is rotatably mounted on the mandrel of the plate, the link being directly connected to the latch, such assembly A reduction gear stage is formed to reduce the operating mechanism trip force. One feature of this mechanism is that the moving contact and the contact support are two independent components. In order to obtain the necessary overtravel function, an overtravel mechanism must be provided between the movable contact and the contact support. The connection between the head and the rotating plate supported by the contact is generally two ways, one is glued or welded together, the disadvantage is that the process is complicated and the firmness is unreliable, and the other is to pass the moving contact The torsion spring is fixed on the contact support, and is not fixed on the rotating shaft of the operating mechanism. The disadvantage is that the rotating arm of the contact is lengthened, and the moving speed of the mechanism is slow, which is not conducive to the breaking performance of the product. Moreover, the contact support in the four-bar linkage is generally fixed by a spring and a rotating plate, and the contact support and the rotating plate can be rotated in a small range, thereby ensuring the contact pressure and overtravel of the product, which can be seen. The existing problem that the movable contact is fixed on the contact support by welding or spring is that the number of parts is large, the structure of the transmission chain is complicated, the assembly and debugging is complicated, and the assembly efficiency is further reduced, thereby affecting Circuit breakers are miniaturized and low cost. In addition, the mechanical interlocking structure in the operating mechanism of the existing miniature circuit breaker is established on the transmission chain between the latch and the trip bar, and usually uses a ratcheting (also commonly referred to as a buckle, etc.). A disadvantage of the toothed construction is that the sharp teeth are subject to wear, which affects the reliability and service life of the product.

With the ever-increasing demands for miniaturization and versatility, there is an increasing demand for improved new technologies for the operation of miniature circuit breakers. The technical improvement direction can be summarized as miniaturization, low cost, including reliability and service life. Performance optimization within the core, and the common technology core associated with these directions is to overcome the constraints of weak environments that affect performance while simplifying the structure and reducing parts.

Summary of the invention

The invention solves the above problems existing in the prior art, and aims to provide an operating mechanism of a miniature circuit breaker, which can further improve the reliability, assembly and debugging of the circuit breaker operating mechanism while simplifying the structure and reducing the number of components. Convenience and productivity.

In order to achieve the above object, the present invention adopts the following technical solutions:

An operating mechanism of a miniature circuit breaker, comprising a handle 2 pivotally mounted on the outer casing 1, a transmission link 3, and a static contact 10 and a movable contact 4 disposed in the outer casing 1, further comprising a tension spring 13 and a trip a lever 5, one end of the transmission link 3 is hingedly coupled with the handle 2, and the other end is coupled with the movable contact 4, one end of the tension spring 13 is fixed on the outer casing 1 and the other end is connected with the movable contact 4; The movable contact 4 is driven by the tension spring 13 and the transmission link 3 to provide contact pressure and overtravel force required for ensuring electrical contact reliability for the closing of the movable contact 4 and the stationary contact 10, and The tension spring 13 provides the energy storage elastic force required for the mechanism resetting of the driving dynamic contact 4 and the static contact 10; the trip lever 5 is disposed on the movable contact 4 for control The locking and unlocking cooperation between the transmission link 3 and the movable contact 4, the trip lever 5 separates the transmission link 3 from the movable contact 4 when the failure occurs to automatically trip the operating mechanism.

Preferably, the outer casing 1 is provided with a mechanism rotating shaft 6 and a limiting shaft 7, and the moving contact 4 is pivotally mounted on the mechanism rotating shaft 6 in the outer casing 1, and the moving contact 4 is extended by a spring. 13 is fixed to the mechanism shaft 6 and the limit shaft 7 of the outer casing 1.

Preferably, the moving contact 4 is rotatably mounted on the mechanism rotating shaft 6 through a strip-shaped arc-shaped slot 41 thereon, and between the curved slot 41 of the movable contact 4 and the mechanism rotating shaft 6 The mounting fit includes an overtravel gap h in a state where the movable contact 4 and the stationary contact 10 are closed.

Preferably, the movable contact 4 is provided with an arcuate slot 41, a transmission slot 42, a pivot hole 43, a limiting slot 44, a spring hook 45 and a movable contact 40, and the arcuate slot 41 and The mechanism rotating shaft 6 on the outer casing 1 is fitted and fitted; the limiting groove 44 is in contact with the limiting shaft 7 on the outer casing 1; the transmission groove 42 on the movable contact 4 and the transmission connecting rod 3 are The transmission end 32 is mechanically coupled, and the pivot hole 43 of the movable contact 4 is mounted and coupled with the pivot 52 of the trip lever 5.

Preferably, the movable contact 4 is provided with an arcuate slot 41 and a pivot hole 43. One end is provided with a concave transmission slot 42 and the other end is provided with a movable contact 40, a spring hook 45 and a limiting slot 44. Between the two sides of the movable contact 4, the spring hook 45 is located between the arcuate slot 41 and the transmission slot 42, the limiting slot 44 is located between the arcuate slot 41 and the movable contact 4, and the pivot hole 43 is located at the limit. Between the groove 44 and the curved slot 41, the arcuate slot 41 is located on the movable contact 4 near the side of the spring hook 45, and the pivot hole 43 is located on the movable contact 4 near the limiting slot 44 side.

Preferably, one end of the movable contact 4 is provided with a transmission slot 42 that is in driving engagement with the transmission end 32 of the transmission link 3, and the trip lever 5 is pivotally mounted on the movable contact 4, and the trip lever 5 is A trip transmission portion 53 and a locking surface 51 for achieving a locking engagement and an unlocking engagement between the transmission link 3 and the movable contact 4 are provided.

Preferably, the locking fit is a transmission groove 42 that abuts the locking surface 51 of the trip lever 5 with the transmission end 32 of the transmission link 3 and locks the transmission end 32 to the movable contact 4 The driving end 32 of the transmission link 3 and the locking surface 51 of the trip lever 5 generate a locking force that cooperates with the transmission groove 42; the unlocking engagement is to make the locking surface 51 and the transmission link on the trip lever 5 The drive end 32 of the motor 3 is disengaged and the drive end 32 is slidable within the drive slot 42 on the moving contact 4.

Preferably, the trip lever 5 is further provided with a reset device for driving the trip lever 5 to rotate about its pivot 52. The reset rotation of the trip lever 5 drives the locking surface 51 and the transmission link 3 on the trip lever 5. The drive end 32 abuts, and the abutment locks the drive end 32 in the transmission slot 42 on the movable contact 4 to achieve a locking fit between the transmission link 3 and the movable contact 4.

Preferably, the trip transmission portion 53 on the trip lever 5 is subjected to a trip device of the miniature circuit breaker The drive rotates about its pivot 52, causing the locking surface 51 of the trip lever 5 to be separated from the drive end 32 of the transmission link 3, the separation allowing the drive end 32 to be within the drive slot 42 on the moving contact 4. Sliding to achieve the unlocking engagement between the transmission link 3 and the movable contact 4.

Preferably, the extension of the line between the two

ends

31, 32 of the transmission link 3 is stabilized below the center of rotation 0 of the handle 2 when the movable contact 4 and the fixed contact 10 are closed; The extension line between the two

ends

31, 32 of the transmission link 3 is stabilized above the rotation center 0 of the handle 2 in the state where the movable contact 4 and the stationary contact 10 are separated; the two ends of the transmission link 3 The extension line between 31 and 32 is transferred from below the center of rotation 0 of the handle 2 to above the center of rotation 0 during the trip.

Preferably, in a state where the movable contact 4 and the fixed contact 10 are closed, the force on the movable contact 4 includes the tensile force of the tension spring 13 and the contact of the static contact 10 with the movable contact 40 of the movable contact 4. The pressure, the drive end 32 of the transmission link 3 and the locking surface 51 of the trip lever 5 cooperate with the locking force of the transmission groove 42 of the movable contact 4, and the resultant force of the contact pressure and the locking force and the tension spring 13 The tension is balanced; in the state where the movable contact 4 and the fixed contact 10 are disconnected, the force on the movable contact 4 includes the pulling force of the tension spring 13, and the binding force of the mechanism rotating shaft 6 on the outer casing 1 acting on the curved slot 41 The contact force of the limiting shaft 7 on the outer casing 1 acts on the limiting groove 44 of the movable contact 4, the resultant force of the contact force and the tensile force of the tension spring 13 and the constraint of the mechanism rotating shaft 6 acting on the curved slot 41 Balance of force.

The operating mechanism of the miniature circuit breaker of the present invention realizes the closing/breaking conversion structure by adopting a three-bar linkage mechanism, eliminating the welding or spring connection process between the moving contact and the contact support, reducing the number of parts, effectively simplifying the structure, and reducing manufacturing. cost. Moreover, by adopting a three-bar linkage mechanism and an optimized design scheme of a new force structure, a lock structure, an overtravel structure, and a closing/breaking conversion structure, the operating mechanism can still provide the required overtravel function, and can also effectively simplify the structure. Reduce manufacturing costs, increase production efficiency and optimize system performance.

DRAWINGS

The advantages and features of the present invention will become more apparent from the description of the embodiments illustrated in the appended claims

1 is a plan view schematically showing the overall structure of an operating mechanism of the miniature circuit breaker of the present invention in which the movable contact 4 and the stationary contact 10 are in a stable breaking state.

Fig. 2 is a plan view schematically showing the overall configuration of an operating mechanism of the miniature circuit breaker of the present invention in a transient state in the process in which the movable contact 4 is operated from the breaking state to the closed state.

Fig. 3 is a plan view showing the overall structure of the operating mechanism of the miniature circuit breaker of the present invention in which the movable contact 4 and the fixed contact 10 are in a stable closed state.

4 is a perspective view of the movable contact 4 in the operating mechanism shown in FIG. 1.

detailed description

The specific embodiment of the operating mechanism of the miniature circuit breaker of the present invention will be further described below with reference to the embodiments given in Figs.

In the embodiment shown in FIGS. 1-3, the operating mechanism of the miniature circuit breaker of the present invention includes a housing 1, a stationary contact 10 (shown schematically as a stationary contact), and is pivotally mounted on the housing 1. The handle 2 is a transmission link 3 hingedly coupled to the handle 2. The operating mechanism of the present invention further includes a tension spring 13, a movable contact 4 driven by the transmission link 3 and the tension spring 13, and a trip for controlling the locking and unlocking cooperation between the transmission link 3 and the movable contact 4. Lever 5. One end 31 of the transmission link 3 is hingedly coupled to the handle 2, and the other end of the transmission end 32 is engaged with the movable contact 4; one end of the tension spring 13 is fixed on the outer casing 1 and the other end is connected to the movable contact 4. The moving contact 4 is driven by the tension spring 13 and the transmission link 3 to provide contact pressure and overtravel required for ensuring electrical contact reliability for the closing of the movable contact 4 and the stationary contact 10. Elastic force, and the tension spring 13 provides the energy storage elastic force required for the mechanism resetting for the breaking of the driving movable contact 4 and the static contact 10; the trip lever 5 is disposed at the moving contact 4, for controlling the locking and unlocking cooperation between the transmission link 3 and the movable contact 4, the trip lever separating the transmission link 3 and the movable contact 4 when a fault occurs, so that The operating mechanism is automatically tripped regardless of the operating handle 2.

In the embodiment shown in FIG. 1-3, the outer casing 1 of the circuit breaker is provided with three shafts respectively mounted in the outer casing 1, which are respectively a shaft for fixing one end of the tension spring 13, and a mechanism shaft 6 And the limiting shaft 7, the moving contact 4 is pivotally mounted on the mechanism rotating shaft 6 in the outer casing 1, and the moving contact 4 is fixed to the mechanism rotating shaft 6 and the limiting shaft 7 of the outer casing 1 by the tension spring 13. The tension spring 13 and the limiting shaft 7 are respectively located at two sides of the movable contact 4, and the limiting shaft 7 defines a rotation range of the movable contact 4.

As shown in FIG. 4, the movable contact 4 of the present invention is provided with an arcuate slot 41, a transmission slot 42, a pivot hole 43, a limiting slot 44, a spring hook 45 and a movable contact 40, and the arcuate slot The hole 41 is fitted and fitted with the mechanism rotating shaft 6 on the outer casing 1; the limiting groove 44 is in contact with the limiting shaft 7 on the outer casing 1; the transmission groove 42 on the movable contact 4 In conjunction with the transmission end 32 of the transmission link 3, the pivot hole 43 of the movable contact 4 is mounted and coupled to the pivot 52 of the trip lever 5. One end of the tension spring 13 is coupled to the outer casing 1, and the other end of the tension spring 13 is coupled with the spring hook 45 on the movable contact 4, so that the movable contact 4 is fixed to the rotating shaft 6 and the limit of the outer casing 1 by the tension spring 13. On the shaft 7, and the tension spring 13 provides the contact pressure required for the moving and stationary contacts to achieve the reliability of the electrical contact. The transmission link 3 can slide in the concave transmission groove 42 of the movable contact 4 and push the movable contact 4 to rotate. The movable contact can be rotated around the mechanism rotating shaft 6 to reach the position of the moving and static contact, and the operating mechanism is further When the buckle is changed, the moving contact 4 is separated from the mechanism rotating shaft 6 due to the change of the force receiving point of the movable contact 4. As shown in FIG. 4, the movable contact 4 is provided with an arcuate slot 41 and a pivot hole 43. One end is provided with a concave transmission slot 42 and the other end is provided with a movement. The contact 40, the spring hook 45 and the limiting slot 44 are respectively located on two sides of the movable contact 4, the spring hook 45 is located between the arcuate slot 41 and the transmission slot 42, and the limiting slot 44 is located in the arc slot 41 and Between the contacts 4, the pivot hole 43 is located between the limiting slot 44 and the arcuate slot 41. The arcuate slot 41 is located on the movable contact 4 on the side of the spring hook 45, and the pivot hole 43 is located on the movable contact 4. Close to the side of the limiting slot 44.

It can be seen that a beneficial feature of the operating mechanism of the miniature circuit breaker of the present invention is that it simultaneously includes three structural solutions different from the prior art: the first is to use the transmission link 3, the moving contact 4 and the tripping. The three-bar linkage constituted by the lever 5 omits the conventional latch lever; the second scheme adopts the structure of a movable contact 4, omitting the conventional contact-supported rotating plate and the contact support and the movable contact The overtravel mechanism or the coupling mechanism between the two; the third method is to adopt a spring structure capable of simultaneously providing energy storage elastic force, contact pressure and over-travel elastic force, that is, still ensuring complete elastic energy storage, elastic contact and elastic overtravel The function of the tension spring 13, omitting the traditional overtravel spring. The essence of the invention is not only to change the overall structural scheme and working principle of the operating mechanism, but also to change the specific structural scheme of the operating mechanism, such as the force structure, the locking structure, the overtravel structure, the closing/breaking conversion structure, etc. of the mechanism. . Obviously, this design has the characteristics of simple structure and few parts, which can effectively reduce manufacturing cost, improve production efficiency, and optimize the performance of the mechanism.

The force structure of the present invention mainly relates to a force-driven structure of the elastic drive structure and the core member. The elastic driving structure can have various specific implementation manners. A preferred mode adopted by the present invention is that the tension spring 13 not only provides the energy storage elastic force for driving the breaking of the movable contact 4 and the static contact 10, but also the tension spring 13 is The closing of the movable contact 4 and the stationary contact 10 provides contact pressure and overtravel force. In the existing four-bar linkage mechanism, the elastic drive structure must use an energy storage spring and an overtravel spring, and the two springs each have respective functions, wherein the energy storage spring provides energy storage for driving the dynamic contact and the static contact. Elastic force (ie elastic energy storage), and the overtravel spring provides contact pressure (ie elastic contact) and overtravel force (ie elastic overtravel) for the closing of the moving contact and the static contact, and lack of a spring is lacking Features. The invention adopts a tension spring 13 to realize the three elastic driving functions of the elastic energy storage, the elastic contact and the elastic overtravel. The force balance structure of the present invention can have various specific implementations, and a preferred mode employed by the present invention includes the following two cases. In the first case, in a state where the movable contact 4 and the fixed contact 10 are closed (as shown in FIG. 3), the force on the movable contact 4 includes a spring hook acting on the movable contact 4 by the tension spring 13. The pulling force of 45, the contact pressure of the static contact 10 acting on the movable contact 40, the driving end 32 of the transmission link 3 and the locking surface 51 of the trip lever 5 cooperate with the locking force of the transmission groove 42 (ie, the transmission link 3) The transmission fit between the transmission end 32 and the transmission groove 42 on the movable contact 4 is in a state of transmitting force, and there must be an interaction transmission force between the transmission end 32 and the transmission groove 42), and the contact pressure is The resultant force of the locking force is balanced with the pulling force of the tension spring 13. In the first case shown in FIG. 3, the mechanism shaft 6 on the outer casing 1 does not provide a binding force to the arcuate slot 41 on the movable contact 4, that is, between the mechanism shaft 6 and the curved slot 41. The mounting fit is in a disengaged state; the limiting shaft 7 on the outer casing 1 does not provide a contact force to the limiting slot 44 on the movable contact 4, that is, the contact fit between the limiting slot 44 and the limiting shaft 7 on the outer casing 1 is Separated state. In the second case, in a state where the movable contact 4 and the stationary contact 10 are disconnected (as shown in FIG. 1), the force on the movable contact 4 includes a spring hook acting on the movable contact 4 by the tension spring 13. The tension of the 45, the mechanism shaft 6 on the outer casing 1 acts on the binding force of the arcuate slot 41 on the movable contact 4, and the contact shaft 7 on the outer casing 1 acts on the contact slot 44 on the movable contact 4. The force, the resultant force of the contact force and the tensile force of the tension spring 13 is balanced with the binding force of the curved slot 41. In the second case shown in FIG. 1, the transmission fit between the drive end 32 of the transmission link 3 and the transmission groove 42 on the movable contact 4 is in a state of no force transmission, despite the locking of the trip lever 5. The face 51 is in a locked state, but there is no (actually no) interaction force between the drive end 32 of the drive link 3 and the drive groove 42 on the moving contact 4. In a state where the movable contact 4 and the fixed contact 10 are closed, the force on the movable contact 4 includes the tension spring 13 acting on the spring hook The pulling force of 45, the contact pressure of the fixed contact 10 on the movable contact 40, the driving end 32 of the transmission link 3 and the locking surface 51 of the trip lever 5 cooperate with the locking force of the transmission groove 42, and the contact The resultant force of the pressure and the locking force is balanced with the pulling force of the tension spring 13. In a state where the movable contact 4 and the fixed contact 10 are disconnected, the acting force on the movable contact 4 includes the pulling force of the tension spring 13 acting on the spring hook 45, and the mechanism rotating shaft 6 on the outer casing 1 acts on the curved slot 41. The binding force, the contact force of the limiting shaft 7 on the outer casing 1 acts on the limiting groove 44, and the resultant force of the contact force and the tensile force of the tension spring 13 is balanced with the binding force of the curved slot 41. It should be understood that the force balance structure is the key to ensure the operating performance and the performance of the mechanism for the operation mechanism of the miniature circuit breaker. The force structure of the present invention is relatively simple and reasonable, and unnecessary loss of force can be avoided. Interference between force and force to ensure the stability and reliability of the force balance and the quick and sensitive action of the operating mechanism.

The locking structure can be implemented in a plurality of specific manners. A preferred manner of the present invention is that the trip lever 5 is provided with a locking surface 51, a pivot 52 and a trip transmission portion 53, the locking surface. 51 is locked and unlocked with the transmission end 32 of the transmission link 3, and the pivot 52 is mounted and coupled with the pivot hole 43 of the movable contact 4. The locking and unlocking cooperation between the transmission link 3 and the movable contact 4 includes a locking engagement and an unlocking engagement, and one end of the movable contact 4 is provided with a transmission that is coupled with the transmission end 32 of the transmission link 3 a slot 42 , the trip lever 5 is pivotally mounted on the movable contact 4 , and the trip lever 5 is provided with a trip transmission portion 53 and a locking fit between the transmission link 3 and the movable contact 4 and The mating locking surface 51 is unlocked. Wherein, the locking engagement causes the locking surface 51 on the trip lever 5 to abut the transmission end 32 of the transmission link 3, and locks the transmission end 32 of the transmission link 3 to the transmission of the movable contact 4. In the slot 42, the drive end 32 of the transmission link 3 and the locking surface 51 of the trip lever 5 generate a locking force that cooperates with the transmission slot 42; the unlocking engagement causes the locking surface 51 and the transmission end 32 of the transmission link 3 The separation and the drive end 32 of the transmission link 3 are slidable within the transmission slot 42. Obviously, the advantage of this configuration is that the locking and unlocking engagement is a cooperation between the locking surface 51 of the trip lever 5 and the transmission end 32 (rod-like structure) of the transmission link 3, which is Compared with the traditional jagged gear, it has obvious advantages of wear resistance, and can also provide a large locking force, which can effectively improve the reliability of the locking. 1-3, in a specific preferred embodiment of the trip lever 5 of the present invention, the trip lever 5 includes a locking arm and a transmission arm, and the locking arm end is provided with a locking surface 51, the transmission arm A tripping transmission portion 53 is disposed, a V-shaped groove is formed between the locking arm and the transmission arm, and a pivot shaft 52 is rotatably coupled to the movable contact 4 on the locking arm, and the trip lever 5 is mounted to the pivot shaft 52 through the pivot 52 On the pivot hole 43 of the movable contact 4, the V-shaped groove of the trip lever 5 is disposed corresponding to the limit shaft 7.

The specific locking structure that matches the locking and unlocking mating structures described above can have a variety of specific implementations. One preferred approach employed by the present invention includes the following two scenarios. In the first case, the trip lever 5 is further provided with a resetting device (not shown) for driving the tripping transmission 53 on the trip lever 5 to rotate about its pivot 52, and the trip lever 5 is reset. The locking surface 51 on which the rotation is driven abuts the transmission end 32 of the transmission link 3 to lock the transmission end 32 in the transmission groove 42 of the movable contact 4, that is, the transmission end 51 and the transmission end of the transmission link 3 32 is in a locked fit state. The resetting device may employ a return spring (not shown) having two ends coupled to the trip lever 5 and the movable contact 4, respectively. It is also possible to employ a resilient angle means (not shown) provided on the trip lever 5, the angular end of which is frictionally and/or constrainedly coupled to the movable contact 4 or the outer casing 1. In the second case, the trip device of the miniature circuit breaker drives the trip transmission portion 53 on the trip lever 5 to rotate about its pivot 52, which rotates the locking surface 51 thereon and the transmission end 32 of the transmission link 3. The separation allows the drive end 32 to slide within the transmission slot 42, i.e., the locking surface 51 and the drive end 32 of the transmission link 3 are in an unlocked engagement condition. Under normal circumstances, the trip device of the miniature circuit breaker includes two types of trip units, one of which is an electromagnetic trip unit. When the electromagnetic trip condition is reached in the circuit, the electromagnetic trip unit is provided with a jack action spring. The striker 12 of the 11 is ejected and strikes the trip drive portion 53 on the trip lever 5 to drive the trip lever 5 to rotate about its pivot 52. The other is a thermal tripper. When a thermal trip condition is reached in the circuit, the thermal sensing device 9 (such as a bimetal device) bends and the drive rod 8 pulls the trip drive 53 on the trip lever 5 to drive The trip lever 5 rotates about its pivot 52. It should be emphasized that the unlocking engagement only occurs when the tripping device drives the trip lever 5, or only during the tripping of the miniature circuit breaker, but not during the normal closing and the normal opening. An unlocking match will occur. In the normal closing state (as shown in Figure 3) and the normal opening state (as shown in Figure 1), and in the normal closing operation (as shown in Figure 1 to the process shown in Figure 3) and normal In the opening operation process (the operation shown in FIG. 3 to the process shown in FIG. 1), since the tripping device does not drive the trip lever 5, the trip lever 5 is always in a locked engagement state, in particular due to the action of the resetting device. As long as the trip device removes the drive of the trip lever 5, the trip lever 5 is automatically reset to the lock-fit state regardless of the position, thereby ensuring the reliability of normal closing and normal opening.

The overtravel structure may have various specific implementation manners, and a preferred manner adopted by the present invention is as follows. As shown in FIG. 3, the movable contact 4 is rotatably mounted on the mechanism rotating shaft 6 through a strip-shaped arc-shaped slot 41 thereon, and in the state where the movable contact 4 and the stationary contact 10 are closed, the movable contact The arcuate slot 41 of the 4 has an overtravel gap h with the mechanism shaft 6 on the outer casing 1, and the overtravel gap is realized by the strip-shaped arcuate slot 41 instead of the circular arcuate slot 41. The overtravel gap is realized by the mounting and matching structure of the arcuate slot 41 and the mechanism shaft 6 on the outer casing 1. The mounting fit enables the arcuate slot 41 mounted on the mechanism shaft 6 to be coupled to the mechanism shaft. 6 sliding fit, so that the overtravel gap h can be formed during the process of operating the movable contact 4 and the fixed contact 10 to be closed (ie, the closed state shown in FIG. 1 is the closed state shown in FIG. 3) The gap h compensates for the overtravel of the known moving contact. The specific overtravel compensation principle is as follows: In the breaking state shown in FIG. 1, the operating handle 2 is rotated clockwise, and the moving contact 5 is pushed by the transmission link 3 to rotate clockwise around the mechanism rotating shaft 6, and is static The contact 10 contacts and reaches the instantaneous state shown in FIG. 2, and in this state and before the state, the movable contact 5 rotates with the mechanism rotating shaft 6 as a fulcrum, that is, the curved slot 41 and the mechanism rotating shaft 6 on the outer casing 1. The overtravel gap h between the two is 0. When the handle 2 continues to rotate, the pivot point of the movable contact 5 leaves the mechanism shaft 6 and is transferred to the fixed contact 10, at which time the movable contact 4 rotates at a point of contact with the fixed contact 10, and the movable contact 4 and The mechanism shaft 6 on the outer casing 1 separates the overtravel gap h until the normal closing operation is completed by reaching the fully closed position as shown in FIG. Of course, from the closed state shown in FIG. 3, the handle 2 can be operated in the reverse direction to return to the breaking state shown in FIG. 1, and the normal opening operation is completed, and the position of each action member is a reverse change of the above operation.

The closing/breaking conversion structure can have various specific implementation manners. A preferred mode adopted by the present invention is: when the movable contact 4 and the static contact 10 are closed, the two ends 31 of the transmission link 3, The extension line of the connection between 32 is stabilized below the center of rotation 0 of the handle 2 (as shown in FIG. 3), so that the operating mechanism is stabilized in the closing state; in the state where the moving contact 4 and the stationary contact 10 are disconnected, The extension line is stabilized above the center of rotation 0 of the handle 2 (as shown in FIG. 3), so that the operating mechanism is stabilized in the opening state; during the tripping, the extension line is transferred from below the center of rotation 0 of the handle 2 to the rotation. Above the center 0. Therefore, it is not difficult to imagine that during the tripping process, the extension line is transferred from below to above due to the unlocking action of the trip lever 5, that is, when the trip lever 5 is driven by the trip device When the shaft 52 rotates, the locking surface 51 thereon is separated from the transmission end 32 of the transmission link 3 and slidable within the transmission groove 42, which causes the transmission end 32 of the transmission link 3 to move downward, which movement causes the extension Rotating one end 31 of the wire drive transmission link 3 clockwise, eventually causing the extension wire to shift from below the inflection point (the center of rotation of the handle 2) to the upper side, and once the extension line crosses the inflection point, pull The spring force of the spring 13 drives the movable contact 4 to rotate in the breaking direction (counterclockwise direction) until the movable contact 4 is in the stable breaking state shown in FIG. 1, that is, the tripping action is completed.

The above is a further detailed description of the present invention in connection with the specific preferred embodiments, and the specific embodiments of the present invention are not limited to the description. It will be apparent to those skilled in the art that the present invention may be made without departing from the spirit and scope of the invention.

Claims

An operating mechanism of a miniature circuit breaker, comprising a handle (2) pivotally mounted on the outer casing (1), a transmission link (3), and a static contact (10) and a movable contact disposed in the outer casing (1) (4), characterized in that it further comprises a tension spring (13) and a trip lever (5), one end of the transmission link (3) is hinge-coupled to the handle (2), and the other end and the movable contact (4) Cooperating, one end of the tension spring (13) is fixed on the outer casing (1), and the other end is connected with the movable contact (4); the movable contact (4) is composed of the tension spring (13) and The transmission link (3) is driven in common to provide contact pressure and overtravel force required for ensuring electrical contact reliability for closing of the movable contact (4) and the stationary contact (10), and the tension spring (13) Providing an energy storage elastic force for the mechanical reset of the movable contact (4) and the stationary contact (10); the trip lever (5) is disposed on the movable contact (4), For controlling the locking and unlocking cooperation between the transmission link (3) and the movable contact (4), the trip lever (5) causes the transmission link (3) and the movable contact when a fault occurs (4) Separate to allow the operating mechanism to automatically trip.
The operating mechanism of the miniature circuit breaker according to claim 1, characterized in that: the casing (1) is provided with a mechanism rotating shaft (6) and a limiting shaft (7), and the movable contact (4) The pivot shaft (6) is pivotally mounted on the mechanism (1), and the movable contact (4) is fixed to the mechanism shaft (6) and the limiting shaft of the outer casing (1) by a tension spring (13). )on.
The operating mechanism of the miniature circuit breaker according to claim 2, characterized in that: the movable contact (4) is rotatably mounted on the mechanism shaft (6) through a strip-shaped arc-shaped slot (41) thereon The mounting fit between the arcuate slot (41) of the movable contact (4) and the mechanism rotating shaft (6) includes an ultra-state in which the movable contact (4) and the stationary contact (10) are closed. Path gap h.
The operating mechanism of the miniature circuit breaker according to claim 2, wherein the movable contact (4) is provided with an arcuate slot (41), a transmission slot (42), a pivot hole (43), a limiting slot (44), a spring hook (45) and a movable contact (40), the arcuate slot (41) being fitted with the mechanism rotating shaft (6) on the outer casing (1); the limit The slot (44) is in mating engagement with the limiting shaft (7) on the outer casing (1); the transmission slot (42) on the movable contact (4) and the transmission end of the transmission link (3) ( 32) transmission fit, the pivot hole (43) on the movable contact (4) and the trip lever (5) The upper pivot (52) is mounted and coupled.
The operating mechanism of the miniature circuit breaker according to claim 4, wherein the movable contact (4) is provided with an arcuate slot (41) and a pivot hole (43), and one end is provided with a concave shape. The transmission slot (42) has a movable contact (40) at the other end, and the spring hook (45) and the limiting slot (44) are respectively located on two sides of the movable contact (4), and the spring hook (45) is located in an arc groove. Between the hole (41) and the transmission groove (42), the limiting groove (44) is located between the arcuate slot (41) and the movable contact (4), and the pivot hole (43) is located in the limiting slot (44) and Between the arcuate slots (41), the arcuate slot (41) is located on the movable contact (4) near the side of the spring hook (45), and the pivot hole (43) is located on the movable contact (4) near the limit One side of the groove (44).
The operating mechanism of the miniature circuit breaker according to claim 1, characterized in that one end of the movable contact (4) is provided with a transmission groove that is matched with the transmission end (32) of the transmission link (3) ( 42), the trip lever (5) is pivotally mounted on the movable contact (4), the trip lever (5) is provided with a trip transmission portion (53) and is used to realize the transmission link (3) A locking fit between the moving contacts (4) and a locking locking surface (51).
The operating mechanism of the miniature circuit breaker according to claim 6, wherein said locking engagement is a driving end (32) of the trip lever (5) and a transmission end (32) of the transmission link (3) Abutting, and locking the transmission end (32) in the transmission groove (42) on the movable contact (4), the transmission end (32) of the transmission link (3) and the trip lever (5) The locking surface (51) produces a locking force that acts in conjunction with the transmission slot (42); the unlocking engagement is the drive end of the locking surface (51) on the trip lever (5) and the transmission link (3) ( 32) Separating and allowing the drive end (32) to slide within the drive slot (42) on the moving contact (4).
The operating mechanism of the miniature circuit breaker according to claim 1, characterized in that the trip lever (5) is further provided with a resetting device for driving the trip lever (5) to rotate about its pivot (52). The reset rotation of the buckle lever (5) drives the locking surface (51) on the trip lever (5) to abut the transmission end (32) of the transmission link (3), which abuts the transmission end (32) It is locked in the transmission groove (42) on the movable contact (4) to realize the locking cooperation between the transmission link (3) and the movable contact (4).
The operating mechanism of the miniature circuit breaker according to claim 1, characterized in that the trip transmission portion (53) on the trip lever (5) is driven by the trip device of the miniature circuit breaker around its pivot (52) Rotating, driving the locking surface (51) of the trip lever (5) and the transmission end of the transmission link (3) (32) separating, the separating end of the transmission end (32) is slidable in a transmission groove (42) on the movable contact (4) to realize the transmission link (3) and the movable contact ( 4) The unlocking fit between.
The operating mechanism of the miniature circuit breaker according to claim 1, characterized in that the extension of the line between the two ends (31, 32) of the transmission link (3) is in the movable contact (4) And the stationary contact (10) is stabilized under the rotation center 0 of the handle (2) in a closed state; the extension line between the two ends (31, 32) of the transmission link (3) is in the movable contact ( 4) Stabilizing above the center of rotation 0 of the handle (2) in the state of being separated from the stationary contact (10); the extension line between the two ends (31, 32) of the transmission link (3) is in the tripping process The middle shifts from below the center of rotation 0 of the handle (2) to above the center of rotation 0.
The operating mechanism of the miniature circuit breaker according to claim 3, characterized in that in the state where the movable contact (4) and the fixed contact (10) are closed, the force on the movable contact (4) comprises a tension spring (13) tension, static contact (10) acts on the contact pressure of the movable contact (40) of the movable contact (4), the transmission end (32) of the transmission link (3) and the trip lever (5) The locking surface (51) cooperates with the locking force of the transmission groove (42) of the movable contact (4), and the resultant force of the contact pressure and the locking force is balanced with the pulling force of the tension spring (13); (4) In the state of being disconnected from the stationary contact (10), the force on the movable contact (4) includes the pulling force of the tension spring (13), and the mechanism rotating shaft (6) on the outer casing (1) acts on the curved groove The binding force of the hole (41), the contact force of the limiting shaft (7) on the outer casing (1) acting on the limiting groove (44) of the movable contact (4), the contact force and the tension spring (13) The resultant force of the pulling force and the mechanism shaft (6) act on the binding force balance of the curved slot (41).