CN111900030A

CN111900030A - Vacuum switch actuating mechanism of vacuum circuit breaker

Info

Publication number: CN111900030A
Application number: CN202010893430.6A
Authority: CN
Inventors: 陈刚
Original assignee: Sichuan Etherbas Technology Development Co ltd
Current assignee: Sichuan Etherbas Technology Development Co ltd
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2020-11-06

Abstract

The invention discloses a vacuum switch actuating mechanism of a vacuum circuit breaker, which comprises a vacuum cavity, wherein a wire inlet end static contact, a wire outlet end static contact and a moving contact are arranged in the vacuum cavity, the outer end of the wire inlet end static contact and the outer end of the wire outlet end static contact are respectively arranged outside the vacuum cavity, the vacuum switch actuating mechanism of the vacuum circuit breaker also comprises a first permanent magnet which is arranged outside the vacuum cavity and can drive the moving contact to move linearly through magnetic force, and the first permanent magnet is provided with a magnet center hole used for being connected with a rotating shaft. The invention realizes the transmission connection between the moving contact arranged in the vacuum cavity by utilizing the magnetism of the first permanent magnet, thereby realizing that the moving contact of one or more vacuum switch actuating mechanisms is driven by the same rotating shaft to complete the on-off control function, occupying smaller space and being beneficial to the miniaturization design and accurate control of the whole circuit breaker.

Description

Vacuum switch actuating mechanism of vacuum circuit breaker

Technical Field

The invention relates to a local structure of a vacuum circuit breaker, in particular to a vacuum switch actuating mechanism of the vacuum circuit breaker.

Background

The vacuum circuit breaker is also called as a vacuum switch, is a circuit breaker with a contact arranged in a vacuum cavity, is named because arc extinguishing media and insulating media in a contact gap after arc extinguishing are high vacuum, has the advantages of small volume, light weight, suitability for frequent operation and no need of maintenance for arc extinguishing compared with an air circuit breaker (also called as an air switch), and is widely applied to high-voltage and low-voltage power distribution networks successively.

The basic structure of the vacuum circuit breaker comprises a vacuum switch actuating mechanism (comprising a vacuum cavity, a moving contact, a static contact and the like), a manual switch mechanism, an overcurrent protection unhooking (namely unhooking and hooking) mechanism and an overcurrent trigger mechanism, wherein the manual switch mechanism and the overcurrent protection unhooking mechanism are connected compactly to form a manual switch and an overcurrent protection mechanism with manual switch control and overcurrent protection automatic unhooking functions; with the advanced development of intellectualization, the existing multifunctional vacuum circuit breaker (or called as an intelligent vacuum circuit breaker) can be combined with an automatic motor mechanism such as a motor, a speed reducing mechanism, a controller and the like to realize the purpose of automatically or remotely controlling the circuit breaker to be opened and closed.

In a traditional vacuum circuit breaker, only a moving contact and a fixed contact are generally arranged in a vacuum cavity, the moving contact is driven to move by external equipment, and the moving contact is generally driven to move by a push rod to realize the contact and disconnection with the fixed contact, so that a manual switch of the traditional vacuum circuit breaker and a driving piece of an overcurrent protection mechanism are generally linearly moved push rods, and the movement direction of the push rods is axial, so that more space is required to be occupied, and the miniaturization design of the whole circuit breaker is not facilitated; and if the driving piece adopts the rotating shaft and realizes the driving of the moving contact in a rotating mode, the occupied space can be well reduced, and the miniaturization design of the whole circuit breaker is facilitated.

For example, the utility model patent of patent number "ZL 201921873919.6", the utility model discloses a low pressure vacuum circuit breaker trip gear is disclosed, relate to vacuum circuit breaker technical field, including the electro-magnet, vacuum interrupter and tripping device, move in the electro-magnet control vacuum interrupter, static contact or separation and realize closing and separating brake, be equipped with tripping device between electro-magnet and the vacuum interrupter, tripping device includes a link assembly, link assembly has fold condition and relatively straight state, link assembly's fold condition and relatively straight state correspond tripping device's trip condition and lock catch state respectively, when overload or short-circuit fault appear in the circuit, link assembly in time responds to switch into fold condition so that move in the vacuum interrupter by relatively straight state, static contact separation and rapid tripping. The patent utilizes the linear motion of link assembly to drive moving contact rectilinear movement and realizes opening, closing function, has the great defect of volume.

In the vacuum switch actuating mechanism of the vacuum circuit breaker, a part is a structure based on the magnetic transmission principle of a permanent magnet, and the structure has the advantages that a mechanical connection-free structure between a driving part and a driven part can be realized, namely, through repulsion transmission, better sealing is realized conveniently, and friction loss is reduced. However, in the conventional vacuum switch actuator based on the magnetic transmission principle of the permanent magnet, the driving mode of the permanent magnet is still a linear motion mode, that is, one of the permanent magnets is driven to move linearly, so that the other permanent magnet moves linearly, and therefore the problem cannot be solved.

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide a vacuum switch actuator of a vacuum circuit breaker based on rotational driving.

The invention realizes the purpose through the following technical scheme:

the utility model provides a vacuum circuit breaker's vacuum switch actuating mechanism, includes the vacuum cavity, install inlet wire end static contact, outlet wire end static contact and moving contact in the vacuum cavity, the outer end of inlet wire end static contact with the outer end of outlet wire end static contact is arranged in respectively outside the vacuum cavity, vacuum circuit breaker's vacuum switch actuating mechanism is still including arranging in outside the vacuum cavity and can drive through magnetic force the first permanent magnet of moving contact rectilinear movement, first permanent magnet is equipped with and is used for the magnet centre bore of being connected with the pivot.

In the structure, the first permanent magnet is an important innovation, the first permanent magnet is arranged outside the vacuum cavity and is convenient to be connected with the rotating shaft, and meanwhile, the magnetic property of the first permanent magnet can be utilized to realize transmission connection between the moving contacts arranged in the vacuum cavity, so that the moving contacts of one or more vacuum switch actuating mechanisms driven by the same rotating shaft can realize the on-off control function.

Preferably, in order to convert the rotary motion of the first permanent magnet into the linear motion of the movable contact and simultaneously realize the transmission without mechanical contact, the vacuum switch actuating mechanism of the vacuum circuit breaker further comprises a second permanent magnet and a connecting rod which are arranged in the vacuum cavity, the vacuum cavity is provided with a cavity through hole, the cavity through hole and the inner space of the vacuum cavity are sealed with each other, the first permanent magnet is arranged in the cavity through hole, the S pole and the N pole are distributed on the periphery of the first permanent magnet, the second permanent magnet is arranged in the vacuum cavity close to the cavity through hole and limited to be capable of linearly moving in the direction close to and far away from the first permanent magnet, one end of the second permanent magnet close to the first permanent magnet is the S pole or the N pole, and one end of the second permanent magnet far away from the first permanent magnet is connected with the first end of the connecting rod, and the second end of the connecting rod is connected with the moving contact.

Further, in order to improve the linear motion capability of the first permanent magnet for driving the second permanent magnet and improve the switching and switching control precision, the vacuum switch actuating mechanism further comprises a third permanent magnet, a first magnet mounting frame, a second magnet mounting frame and mounting frame connecting pieces, wherein the third permanent magnet is arranged in the vacuum cavity, is close to the cavity through hole and is respectively positioned at two opposite sides of the cavity through hole together with the second permanent magnet, the second permanent magnet is arranged on the first magnet mounting frame, the third permanent magnet is arranged on the second magnet mounting frame, two ends of the first magnet mounting frame and two ends of the second magnet mounting frame are respectively and correspondingly connected through the two mounting frame connecting pieces, and an S pole and an N pole are symmetrically distributed on the periphery of the first permanent magnet, the polarity of one end of the third permanent magnet close to the first permanent magnet meets the following condition: the first permanent magnet and the second permanent magnet repel each other, and the first permanent magnet and the third permanent magnet attract each other.

Preferably, in order to place two static contacts and one moving contact in a separate vacuum space to facilitate better arc extinguishing effect, the vacuum cavity comprises a first vacuum cavity and a second vacuum cavity, the inlet wire end static contact, the outlet wire end static contact and the moving contact are arranged in the first vacuum cavity, the second permanent magnet, the third permanent magnet, the first magnet mounting rack, the second magnet mounting rack and the mounting rack connecting piece are arranged in the second vacuum cavity, a second cavity cover is arranged at the first end of the second vacuum cavity, the second end of the second vacuum cavity is connected with the first end of the first vacuum cavity, a first cavity cover is arranged at the joint, the second end of the first vacuum cavity is closed, a cavity cover through hole is formed in the first cavity cover, and the connecting rod penetrates through the cavity cover through hole.

Furthermore, in order to enable the movable contact to have certain elasticity in the process of contacting with the fixed contact so as to achieve better conductive contact effect and avoid damage of the contact due to hard contact, the vacuum switch actuating mechanism further comprises a connecting disc, two positioning shafts are arranged on one side surface of the connecting disc, spiral compression springs are respectively sleeved on the two positioning shafts, a connecting disc through hole is arranged between the two positioning shafts on the connecting disc, two contacts are arranged at one end of the movable contact far away from the connecting rod, two positioning holes are respectively arranged at the corresponding positions of one end of the movable contact close to the connecting rod and the two contacts, the two positioning shafts are respectively arranged in the two positioning holes, the two spiral compression springs are positioned between the connecting disc and the movable contact, and a movable contact counter bore or a movable contact through hole is arranged at the position of the movable contact between the two positioning holes, the movable contact is characterized in that a connecting through hole which is communicated with the moving contact counter bore or the moving contact through hole and is vertical to the moving contact in the axial direction is arranged at a position between the two positioning holes on the movable contact, a section of the connecting rod, which is close to the second end, is reduced in diameter to form a small diameter section, a strip-shaped through hole which is coaxial with the connecting rod is arranged on the small diameter section, the small diameter section of the connecting rod penetrates through the connecting disc through hole and then is arranged in the moving contact counter bore or the moving contact through hole, a section of the connecting rod, which is close to the first end, is larger than the diameter of the connecting disc through.

The invention has the beneficial effects that:

the invention realizes transmission connection between the first permanent magnet and the moving contact arranged in the vacuum cavity by utilizing the magnetism of the first permanent magnet, thereby realizing that the moving contact of one or more vacuum switch actuating mechanisms is driven by the same rotating shaft to complete the on-off control function, occupying smaller space and being beneficial to the miniaturization design and accurate control of the whole circuit breaker; more specific advantages are as follows:

the first permanent magnet is arranged outside the vacuum cavity and is convenient to be connected with the rotating shaft, the second permanent magnet is arranged in the vacuum cavity and is close to the first permanent magnet to form a magnetic force (attraction or repulsion) transmission structure, the rotary motion of the first permanent magnet is converted into the linear motion of the second permanent magnet and is connected with the movable contact through the connecting rod, the rotary motion of the first permanent magnet is converted into the linear motion of the movable contact, and the accurate on-off control function is realized;

according to the invention, the third permanent magnet and the second permanent magnet are connected together and are respectively arranged on two sides of the first permanent magnet, and when the first permanent magnet rotates, the second permanent magnet and the third permanent magnet are simultaneously driven to move in the same direction, so that the transmission capability is obviously increased, and the moving contact is more stably and accurately controlled;

according to the invention, the two static contacts and the two moving contacts are independently arranged in the first vacuum cavity, and the second permanent magnet, the third permanent magnet, the first magnet mounting rack, the second magnet mounting rack and the mounting rack connecting sheet are arranged in the second vacuum cavity, so that the contact in the first vacuum cavity can realize a better arc extinguishing effect in the opening and closing processes, and meanwhile, the adverse effect of sparks generated when the contact is disconnected on other parts is avoided;

according to the invention, the connecting disc is additionally arranged between the second cavity cover and the movable contact, and the corresponding connecting structure and the spiral pressure spring are arranged, so that the movable contact has certain elasticity in the process of contacting with the fixed contact, a better conductive contact effect is realized, the damage of the contact caused by hard contact is avoided, the problem of poor contact caused by contact ablation can be avoided, the contact of the contact is more attached, the contact resistance is reduced, and the heat productivity of the contact is reduced.

Drawings

Fig. 1 is an exploded perspective view of a vacuum switch actuator of a vacuum circuit breaker according to the present invention prior to assembly, and also showing an overcurrent trigger mechanism;

fig. 2 is one of the assembled three-dimensional cross-sectional views of the vacuum switch actuating mechanism of the vacuum circuit breaker of the present invention, in which the moving contact and the static contact are in a disconnected state, and the overcurrent triggering mechanism is also shown in the drawing;

fig. 3 is a second assembled perspective sectional view of the vacuum switch actuator of the vacuum circuit breaker of the present invention, in which the moving contact and the static contact are in a connected state, and the overcurrent trigger mechanism is also shown;

fig. 4 is a perspective exploded view of the vacuum switch actuator of the vacuum circuit breaker of the present invention before being applied to a three-way synchronous controlled multifunctional vacuum circuit breaker.

Detailed Description

The invention will be further described with reference to the accompanying drawings in which:

as shown in fig. 1 to 3, the vacuum switch actuator of the vacuum circuit breaker of the present invention includes a vacuum cavity (see a first vacuum cavity 221 and a second vacuum cavity 205 of fig. 1 to 3), and a first permanent magnet 207 disposed outside the vacuum cavity and capable of driving a moving contact 218 to move linearly by magnetic force, wherein a line inlet end fixed contact 220, a line outlet end fixed contact 223, and a moving contact 218 are mounted in the vacuum cavity, an outer end of the line inlet end fixed contact 220 and an outer end of the line outlet end fixed contact 223 are disposed outside the vacuum cavity, respectively, the vacuum switch actuator of the vacuum circuit breaker of the present invention further includes a first permanent magnet 207 disposed outside the vacuum cavity and capable of driving the moving contact 218 to move linearly by magnetic force, and the first permanent magnet 207 is provided with a magnet center hole 208 for connecting with a rotating shaft (see a.

As shown in fig. 1-4, taking the application of the vacuum switch actuator of the vacuum circuit breaker of the present invention to a three-way synchronous controlled multifunctional vacuum circuit breaker as an example, the multifunctional vacuum circuit breaker includes a manual switch and overcurrent protection mechanism 5, three vacuum switch actuators 2, three overcurrent triggering mechanisms 3, a rotating shaft return plate 71, a rotating shaft return spring 72, a motor driving device 8 and a breaker mounting rack, wherein the moving contacts 218 of the vacuum switch actuators 2 are respectively driven by the rotating shafts 501 of the manual switch and overcurrent protection mechanism 5, the outer ends of the stationary contacts 223 of the outlet terminals of the vacuum switch actuators 2 are respectively connected with the overcurrent triggering mechanisms 3 and then connected with electrical equipment (not shown), and the manual switch and overcurrent protection mechanism 5 are respectively connected with the overcurrent triggering mechanisms 3; the rotating shaft 501 penetrates through the magnet central holes 208 of the first permanent magnets 207 of the three vacuum switch actuators 2 and can drive the first permanent magnets 207 to rotate synchronously; the overcurrent trigger mechanism 3 comprises an overcurrent coil 32 and a trigger rod 31, the trigger rod 31 is arranged in the trigger coil 32 and can move axially when the trigger coil 32 is overcurrent, the outer ends of outlet terminal static contacts 223 of the three vacuum switch actuating mechanisms 2 are respectively connected with the overcurrent coils 32 of the three overcurrent trigger mechanisms 3 correspondingly and then connected with an electrical appliance (not shown in the figure), the trigger coil 32 and the electrical appliance form a series connection structure, the currents of the two are the same, when the electrical appliance is short-circuited or overloaded, the current of the trigger coil 32 can be suddenly and remarkably increased, so that the trigger rod 31 moves axially in the direction far away from the trigger coil 32, and the overcurrent trigger function is realized; the two side brackets 1 and the two middle brackets 4 are connected together to form a breaker mounting frame of the whole breaker, and the shapes and the sizes of the side brackets 1 and the middle brackets 4 are determined according to requirements; a control circuit board 6 is arranged on one middle bracket 4 and used for realizing automatic control; the pivot return disk 71 is installed on pivot return disk 71 through self through-hole suit on pivot 501, pivot return spring 72's both ends respectively install pivot return disk 71 with on the circuit breaker mounting bracket and make pivot 501 have by on-state to off state's stress, motor drive 8's rotatory power take off end is connected with pivot 501's one end, is convenient for realize opening like this through the rotation of motor control pivot 501, closes the function, is convenient for simultaneously realize automatic switch, off control and remote switch, off control function together with control circuit board 6. Fig. 4 also shows a connection terminal 9 for connecting the outer end of the inlet terminal fixed contact 220 and the outer end of the outlet terminal fixed contact 223 with external wires, respectively, which is an adaptive conventional structure.

As shown in fig. 1 to 4, the basic operation principle of the vacuum switch actuator of the vacuum circuit breaker of the present invention is as follows: when the rotating shaft 501 of the manual switch and overcurrent protection mechanism 5 rotates to the on position, the rotating shaft 501 drives the three first permanent magnets 207 to rotate, so that the movable contact 218 is communicated with the inlet terminal fixed contact 220 and the outlet terminal fixed contact 223, the vacuum switch actuating mechanism 2 is in an on state, and an electric appliance is powered on to work; when the rotating shaft 501 is rotated to the off position, the rotating shaft 501 drives the three first permanent magnets 207 to rotate reversely, so that the movable contact 218 is disconnected from the inlet terminal fixed contact 220 and the outlet terminal fixed contact 223, the vacuum switch actuating mechanism 2 is in the off state, and the electric appliance is powered off and stops working.

As shown in fig. 1 to 3, the present invention also discloses a plurality of more optimized and more specific structures, and one or more structures can be combined with the above structures in a superposition manner to form more optimized and more specific technical solutions according to actual needs.

As shown in fig. 1-3, in order to convert the rotational motion of the first permanent magnet 207 into the linear motion of the movable contact 218 and simultaneously realize the transmission without mechanical contact, the vacuum switch actuator of the vacuum circuit breaker of the present invention further includes a second permanent magnet 209 and a connecting rod 212 disposed in the vacuum cavity, the vacuum cavity is provided with a cavity through hole 206, the cavity through hole 206 and the inner space of the vacuum cavity are sealed with each other, the first permanent magnet 207 is disposed in the cavity through hole 206, S-pole and N-pole are distributed on the periphery of the first permanent magnet 207, the second permanent magnet 209 is disposed in the vacuum cavity at a position close to the cavity through hole 206 and limited to be capable of linearly moving in a direction close to and far away from the first permanent magnet 207, one end of the second permanent magnet 209 close to the first permanent magnet 207 is S-pole or N-pole, one end of the second permanent magnet 209 far away from the first permanent magnet 207 is, the second end of the link 212 is connected to the movable contact 218. When the switch works, the first permanent magnet 207 rotates to drive the polarity of the periphery of the first permanent magnet to change, the magnetic force between the first permanent magnet 207 and the second permanent magnet 209 changes, the moving contact 218 is pushed to be connected with the inlet wire end static contact 220 and the outlet wire end static contact 223, or the moving contact 218 is pulled to be disconnected with the inlet wire end static contact 220 and the outlet wire end static contact 223, and the on-off control function is realized.

As shown in fig. 1-3, in order to improve the ability of the first permanent magnet 207 to drive the second permanent magnet 209 to move linearly and thus improve the switching control precision, the vacuum switch actuator of the vacuum circuit breaker of the present invention further includes a third permanent magnet 203, a first magnet mounting bracket 210, a second magnet mounting bracket 202, and mounting bracket connecting pieces 204, which are disposed in the vacuum cavity, the third permanent magnet 203 is disposed in the vacuum cavity near the cavity through hole 206 and is located at two opposite sides of the cavity through hole 206 with the second permanent magnet 209, respectively, the second permanent magnet 209 is mounted on the first magnet mounting bracket 210, the third permanent magnet 203 is mounted on the second magnet mounting bracket 202, two ends of the first magnet mounting bracket 210 and two ends of the second magnet mounting bracket 202 are correspondingly connected through two mounting bracket connecting pieces 204, an S pole and an N pole are symmetrically distributed on the periphery of the first permanent magnet 207, the polarity of the end of third permanent magnet 203 adjacent first permanent magnet 207 satisfies the following condition: the first permanent magnet 207 and the third permanent magnet 203 attract each other while the first permanent magnet 207 and the second permanent magnet 209 repel each other, and conversely, the first permanent magnet 207 and the third permanent magnet 203 repel each other while the first permanent magnet 207 and the second permanent magnet 209 attract each other. During operation, no matter the first permanent magnet 207 rotates 130 degrees and 160 degrees in the same direction (specifically determined according to the magnitude of the magnetic force, the polarity of the two sides of the first permanent magnet 207 close to the second permanent magnet 209 and the third permanent magnet 203 changes, so that attraction force is generated on the second permanent magnet 209 and repulsion force is generated on the third permanent magnet 203, or repulsion force is generated on the second permanent magnet 209 and attraction force is generated on the third permanent magnet 203, the directions of the forces applied to the second permanent magnet 209 and the third permanent magnet 203 are the same, resultant force is formed, and the moving contact 218 is driven by the connecting rod 212 to be connected with or disconnected with the inlet terminal fixed contact 220 and the outlet terminal fixed contact 223, so that more efficient and accurate opening and closing control functions are realized.

As shown in fig. 1-3, in order to place the inlet terminal fixed contact 220, the outlet terminal fixed contact 223 and the movable contact 218 in separate vacuum spaces for better arc extinguishing effect, the vacuum cavity comprises a first vacuum cavity 221 and a second vacuum cavity 205, a wire inlet end static contact 220, a wire outlet end static contact 223 and a moving contact 218 are arranged in the first vacuum cavity 221, a second permanent magnet 209, a third permanent magnet 203, a first magnet mounting frame 210, a second magnet mounting frame 202 and a mounting frame connecting sheet 204 are arranged in the second vacuum cavity 205, a second cavity cover 201 is installed at the first end of the second vacuum cavity 205, a second end of the second vacuum cavity 205 is connected with the first end of the first vacuum cavity 221, a first cavity cover 211 is installed at the connection position, the second end of the first vacuum cavity 221 is sealed, a cavity cover through hole is formed in the first cavity cover 211, and the connecting rod 212 penetrates through the cavity cover through hole.

As shown in fig. 1-3, in order to make the moving contact 218 have a certain elasticity in the contact process with the inlet terminal fixed contact 220 and the outlet terminal fixed contact 223, so as to achieve a better conductive contact effect and avoid damage of the contacts due to hard contact, the vacuum switch actuator of the vacuum circuit breaker of the present invention further includes a connecting disc 214, two positioning shafts 216 are disposed on a surface of one side of the connecting disc 214, spiral compression springs 215 are respectively sleeved on the two positioning shafts 216, a connecting disc through hole (not labeled) is disposed on the connecting disc 214 at a position between the two positioning shafts 216, two contacts (not labeled) are disposed on one end of the moving contact 218 away from the connecting rod 212, two positioning holes (not labeled) are respectively disposed on one end of the moving contact 218 close to the connecting rod 212 and at positions corresponding to the two contacts, the two positioning shafts 216 are respectively disposed in the two positioning holes, and the two spiral compression springs 215 are disposed between, a moving contact counter bore 217 (or a moving contact through hole) is arranged at a position between the two positioning holes on the moving contact 218, a connecting through hole (not marked in the figure) which is communicated with the moving contact counter bore 217 and is vertical to the axial direction is arranged at a position between the two positioning holes on the moving contact 218, a section of diameter of the connecting rod 212 close to the second end is reduced to form a small-diameter section, a strip-shaped through hole 213 which is coaxial with the connecting rod 212 is arranged on the small-diameter section, the small-diameter section of the connecting rod 212 penetrates through the connecting disc through hole and then is arranged in the moving contact counter bore 217, a section of diameter of the connecting rod 212 close to the first end is larger than that of the connecting disc through hole, and. Because the length of the strip-shaped through hole 213 is greater than the width, the connecting pin 219 can move in the strip-shaped through hole 213, so that a movable connecting structure with a certain moving space is formed between the connecting rod 212 and the movable contact 218, and meanwhile, the helical compression spring 215 makes the connecting rod 212 and the movable contact 218 tend to be away from each other, so that the connection between the connecting rod 212 and the movable contact 218 is also stable, and only has certain elasticity when being pressed. In the process that the connecting rod 212 pushes the movable contact 218 to move and contact in the direction close to the inlet terminal fixed contact 220 and the outlet terminal fixed contact 223, the spiral pressure spring 215 enables the movable contact 218 to have a buffering effect when contacting the inlet terminal fixed contact 220 and the outlet terminal fixed contact 223, the contact is prevented from being damaged by too direct hard contact, meanwhile, the conductivity of the buffering type contact is better, the problem of poor contact caused by contact ablation can be avoided, the contact is more attached, the contact resistance is reduced, and the heating value of the contact is reduced.

The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, so long as the technical solutions can be realized on the basis of the above embodiments without creative efforts, which should be considered to fall within the protection scope of the patent of the present invention.

Claims

1. The utility model provides a vacuum circuit breaker's vacuum switch actuating mechanism, includes the vacuum cavity, install inlet wire end static contact, outlet wire end static contact and moving contact in the vacuum cavity, the outer end of inlet wire end static contact and the outer end of outlet wire end static contact are arranged in respectively outside the vacuum cavity, its characterized in that: the vacuum switch actuating mechanism of the vacuum circuit breaker further comprises a first permanent magnet which is arranged outside the vacuum cavity and can drive the movable contact to move linearly through magnetic force, and the first permanent magnet is provided with a magnet center hole used for being connected with the rotating shaft.

2. The vacuum switch actuator of the vacuum circuit breaker according to claim 1, wherein: the vacuum switch actuating mechanism of the vacuum circuit breaker further comprises a second permanent magnet and a connecting rod, wherein the second permanent magnet and the connecting rod are arranged in the vacuum cavity, the vacuum cavity is provided with a cavity through hole, the cavity through hole and the inner space of the vacuum cavity are sealed mutually, the first permanent magnet is arranged in the cavity through hole, the S pole and the N pole are distributed on the periphery of the first permanent magnet, the second permanent magnet is arranged in the vacuum cavity, the position of the second permanent magnet, which is close to the cavity through hole, is limited and can move in a direction of being close to and away from the first permanent magnet, one end, which is close to the first permanent magnet, of the second permanent magnet is the S pole or the N pole, one end, which is far away from the first permanent magnet, of the second permanent magnet is connected with the first end of the.

3. The vacuum switch actuator of the vacuum circuit breaker according to claim 2, wherein: vacuum switch actuating mechanism is still including arranging in third permanent magnet, first magnet mounting bracket, second magnet mounting bracket and mounting bracket connection piece in the vacuum cavity, the third permanent magnet is arranged in be close to in the vacuum cavity the position of cavity through-hole and with the second permanent magnet is located respectively the relative both sides of cavity through-hole, the second permanent magnet is installed on the first magnet mounting bracket, the third permanent magnet is installed on the second magnet mounting bracket, the both ends of first magnet mounting bracket with respectively through two between the both ends of second magnet mounting bracket the mounting bracket connection piece corresponds, the periphery symmetric distribution of first permanent magnet has an S utmost point and an N utmost point, the third permanent magnet is close to the polarity of the one end of first permanent magnet satisfies following condition: the first permanent magnet and the second permanent magnet repel each other, and the first permanent magnet and the third permanent magnet attract each other.

4. The vacuum switch actuator of the vacuum circuit breaker according to claim 3, wherein: the vacuum cavity comprises a first vacuum cavity and a second vacuum cavity, the incoming line end static contact, the outgoing line end static contact and the moving contact are arranged in the first vacuum cavity, the second permanent magnet, the third permanent magnet, the first magnet mounting frame, the second magnet mounting frame and the mounting frame connecting piece are arranged in the second vacuum cavity, the second cavity cover is installed at the first end of the second vacuum cavity, the first cavity cover is installed at the position where the second end of the second vacuum cavity and the first end of the first vacuum cavity are connected and the connecting position is connected, the second end of the first vacuum cavity is sealed, the first cavity cover is provided with a cavity cover through hole, and the connecting rod penetrates through the cavity cover through hole.

5. The vacuum switch actuator of the vacuum circuit breaker according to claim 2, 3 or 4, wherein: the vacuum switch actuating mechanism further comprises a connecting disc, two positioning shafts are arranged on one side surface of the connecting disc, spiral pressure springs are sleeved on the two positioning shafts respectively, a connecting disc through hole is formed in the connecting disc and positioned between the two positioning shafts, two contacts are arranged at one end, far away from the connecting rod, of the movable contact, two positioning holes are formed in the movable contact and positioned corresponding to the two contacts and close to one end of the connecting rod, the two positioning shafts are arranged in the two positioning holes respectively, the two spiral pressure springs are positioned between the connecting disc and the movable contact, a movable contact counter bore or a movable contact through hole is formed in the movable contact and positioned between the two positioning holes, a connecting through hole which is communicated with the movable contact counter bore or the movable contact through hole and is vertical to the axial direction is formed in the position, between the two positioning holes, of the movable contact, the connecting rod is provided with a connecting disc through hole, the connecting disc through hole is arranged in the moving contact counter bore or the moving contact through hole, the diameter of one section of the connecting rod close to the second end is reduced to form a small-diameter section, a strip-shaped through hole which is coaxial with the connecting rod is arranged on the small-diameter section, the small-diameter section of the connecting rod penetrates through the connecting disc through hole and then is arranged in the moving contact counter bore or the moving contact through hole, the diameter of one section of the connecting rod close to the first end is larger.