CN216213090U - Contact mechanism - Google Patents

Abstract

The utility model provides a contact mechanism, includes moving contact and stationary contact who mutually supports the stationary contact is equipped with and holds the chamber hold the intracavity and be equipped with electrically conductive contact finger and first contact subassembly, first contact subassembly includes and holds the first contact that the chamber is connected, and the moving contact stretches into when the on-state holds the intracavity, sets up the mating holes at moving contact tip and the cooperation of pegging graft of the head end of first contact, and the outside and the electrically conductive contact of moving contact finger are pegged graft and are cooperated simultaneously, still be equipped with between first contact subassembly and the electrically conductive contact finger and hold the baffle subassembly that the intracavity carried out concertina movement, at divide-shut brake in-process, when producing electric arc between moving contact and the first contact, the baffle subassembly is located the head end of first contact and is used for the separation electric arc between the electrically conductive contact finger. When the switch is switched on and switched off, the baffle component can block and extinguish the electric arc between the movable contact and the first contact, so that the electric arc can be prevented from damaging the conductive contact finger.

Description

Contact mechanism

Technical Field

The utility model relates to the technical field of high-voltage switches, in particular to a contact mechanism.

Background

The gas insulated totally enclosed combined electrical apparatus (GIS) is composed of circuit breaker, isolating switch, earthing switch, mutual inductor, lightning arrester, bus, connecting piece and outlet terminal, all of which are enclosed in a metal earthed shell. The GIS has the advantages of low failure rate, high operation reliability, less maintenance workload and long overhaul period, but when the GIS is applied to the voltage of 126kV or above, when the isolating switch switches current at an open-close bus, electric arcs can be generated between a moving contact and a static contact, the electric arcs can cause contact burning loss and contact finger damage, and generated decomposed substances can also pollute an insulating part in the switch to cause switch insulation failure and/or insulation performance reduction.

At present, in order to solve the above problems, the switching speed of the disconnecting switch is normally properly increased, and meanwhile, an arc striking structure made of an alloy material (the alloy material plays a role in resisting arc erosion) is designed at the end parts of a moving contact and a fixed contact.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide a contact mechanism which is high in opening and closing speed and small in arc influence.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a contact mechanism comprises a moving contact and a stationary contact which are mutually matched, wherein the stationary contact is provided with an accommodating cavity, a conductive contact finger and a first contact component are assembled in the accommodating cavity, the first contact component comprises a first contact which is electrically connected with the accommodating cavity, the moving contact extends into the accommodating cavity in a conduction state, a matching hole arranged at the end part of the moving contact is in plug-in fit with the head end of the first contact, and the outer side of the moving contact is in plug-in fit with the conductive contact finger,

and a baffle component capable of performing telescopic motion in the accommodating cavity is further assembled between the first contact component and the conductive contact finger, and in the switching-on and switching-off process, when electric arcs are generated between the movable contact and the first contact, the baffle component is positioned between the head end of the first contact and the conductive contact finger and used for blocking the electric arcs.

Preferably, in the switching-on process, when the moving contact is close to the head end of the first contact to generate an electric arc, the baffle assembly is positioned between the head end of the first contact and the conductive contact finger, then the baffle assembly is contracted by jacking pressure of the moving contact, the electric arc is extinguished when the first contact is plugged with the matching hole, and finally the moving contact is plugged with the conductive contact finger to complete switching-on;

in the process of opening the brake, the moving contact is firstly separated from the conductive contact finger to be powered off, then the moving contact is separated from the head end of the first contact to generate electric arc, and the baffle plate component resets to enable the baffle plate component to be positioned between the head end of the first contact and the conductive contact finger.

Preferably, the first contact assembly further comprises an elastic energy storage element, when the moving contact performs a switching-off motion, the head end of the first contact is pulled out of the accommodating cavity by a certain distance, the elastic energy storage element stores energy, and after the head end of the first contact is separated from the moving contact, the elastic energy storage element releases energy to enable the head end of the first contact to rapidly return to the accommodating cavity.

Preferably, the head end of the baffle assembly is flush with the head end of the first contact at the opening of the receiving cavity.

Preferably, one end of the mating hole close to the outside is a friction end, and when the brake is switched off, the head end of the first contact is matched with the friction end to pull the first contact to move along with the contact, so that the elastic energy storage part stores energy; one end of the matching hole close to the inside is an isolating end, when the switch is switched on, the head end of the first contact overcomes the friction force between the head end and the friction end and then extends into the isolating end, and the isolating end is not electrically connected with the first contact.

Preferably, the fitting hole is a stepped hole with a thick inner end and a thin outer end, the thick end is an isolating end, the inner diameter of the isolating end is larger than the outer diameter of the head end of the first contact, and the inner diameter of the friction end is smaller than the outer diameter of the elastic head end of the first contact.

Preferably, an elastic limit structure is arranged between the head end of the baffle plate assembly and the head end of the first contact, and the head end of the baffle plate assembly and the head end of the first contact are kept flush by the elastic limit structure.

Preferably, the outer side wall of the head end of the first contact protrudes along the radial direction to form an annular boss structure, the annular boss structure serves as an elastic limiting portion, the head end of the baffle plate assembly is matched with the elastic limiting portion to be flush with the head end of the quick contact, and the first contact and the moving contact move along the same straight line.

Preferably, the elastic energy storage part comprises a contact plate, an insulating guide plate and a contact spring, the contact plate is fixedly arranged at the tail end of the first contact and is electrically connected with the accommodating cavity, the insulating guide plate is sleeved at the middle part of the first contact and is in insulating fit with the accommodating cavity, the contact spring is sleeved on the first contact between the contact plate and the insulating guide plate, the contact plate is in sliding fit with the accommodating cavity, and the insulating guide plate is fixedly connected with the accommodating cavity.

Preferably, the baffle assembly comprises an annular baffle and an elastic piece, the central hole of the annular baffle is used for the first contact to pass through, the elastic piece is sleeved in the middle of the first contact, one end of the elastic piece is connected with the annular baffle in an insulating mode, and the other end of the elastic piece is connected with the accommodating cavity.

Preferably, one end of the central hole of the annular baffle, which is close to the elastic piece, is provided with a boss as an elastic clamping part, the elastic clamping part protrudes along the annular shape of the central hole, and the annular baffle is clamped with the head end of the first contact through the elastic clamping part, so that the annular baffle is flush with the head end of the first contact.

Preferably, the inside wall of holding the chamber is equipped with the ring channel along the hoop, electrically conductive touching finger sets up in the ring channel, and the external diameter of baffle subassembly is less than electrically conductive touching finger's internal diameter.

Preferably, the accommodating cavity comprises a first mounting groove and a second mounting groove which are communicated with each other, the baffle assembly and the conductive contact finger are located in the first mounting groove, the first contact penetrates through the first mounting groove and the second mounting groove, the head end of the first contact and the head end of the baffle assembly are flush with one end opening of the first mounting groove, which is far away from the second mounting groove, of the first mounting groove, and the elastic energy storage piece arranged on the first contact is located in the second mounting groove and is in sliding fit with the second mounting groove.

Preferably, the inner diameter of the second mounting groove is smaller than that of the first mounting groove, the second mounting groove is communicated with the first mounting groove through a connecting hole, and the inner diameter of the connecting hole is smaller than that of the second mounting groove.

Preferably, the middle part of the first contact is further sleeved with an elastic check ring, and in the switching-on process, the elastic check ring is abutted against and matched with the side wall of the first installation groove close to one end of the connecting hole, so that the head end of the first contact is connected with the matching hole of the movable contact in an inserting mode.

According to the contact mechanism, the baffle plate component is arranged between the first contact and the conductive contact finger, when the moving contact is in opening and closing motion, the moving contact is matched with the baffle plate component, so that electric arcs generated between the moving contact and the first contact are separated and extinguished by the baffle plate component, and therefore the electric arcs are prevented from damaging the conductive contact finger.

In addition, baffle subassembly and first contact keep the parallel and level at the opening part that holds the chamber, and the head end of first contact is pulled out and holds outside the chamber during the separating brake, makes electric arc extinguish holding the chamber outside, and elastic energy storage spare makes the quick and moving contact separation of first contact, further reduces the harm that electric arc touched the finger to electrically conducting.

In addition, an elastic limiting structure is arranged between the head end of the first contact and the head end of the baffle assembly, so that the first contact and the head end of the baffle assembly are kept flush.

In addition, when closing a switch, no electrical connection exists between the head end of the first contact and the moving contact, and the first contact is prevented from being burnt due to long-term electrification.

Drawings

FIG. 1 is a schematic structural diagram of a contact mechanism of the present invention prior to closing;

FIG. 2 is a schematic structural diagram of a contact mechanism of the present invention at the completion of closing;

FIG. 3 is a schematic structural diagram of a contact mechanism according to the present invention, in which a first contact is pulled out by a passive contact when opening;

FIG. 4 is a schematic structural view of a contact mechanism according to the present invention when the first contact is retracted during opening;

fig. 5 is a schematic structural diagram of an arc generated between a movable contact and a first contact when the contact mechanism is opened;

FIG. 6 is a schematic structural diagram of arc extinguishing during opening of a contact mechanism according to the present invention;

FIG. 7 is a schematic structural view of a contact mechanism of the present invention when opening is completed;

figure 8 is a schematic diagram of a spring retention feature in a contact mechanism according to the present invention to keep the shutter assembly flush with the first contact assembly;

fig. 9 is a schematic view of a contact mechanism according to the present invention in which the first contact is pulled out;

fig. 10 is a schematic structural view of a movable contact in the contact mechanism of the present invention;

fig. 11 is a schematic structural diagram of a stationary contact base in the contact mechanism of the present invention.

Detailed Description

A specific embodiment of a contact mechanism according to the present invention is further described below with reference to the embodiments shown in fig. 1 to 11. A contact mechanism of the present invention is not limited to the description of the following embodiments.

A contact mechanism comprises a movable contact 1 and a stationary contact 2 which are matched with each other, wherein the stationary contact 2 is provided with an accommodating cavity, a conductive contact finger 3 and a first contact component 4 are assembled in the accommodating cavity, the first contact component 4 comprises a first contact 41 electrically connected with the accommodating cavity, the movable contact 1 extends into the accommodating cavity in a conduction state, a matching hole 11 formed in the end part of the movable contact 1 is in plug-in matching with the head end of the first contact 41, meanwhile, the outer side of the movable contact 1 is in plug-in matching with the conductive contact finger 3, a baffle component 5 capable of performing telescopic motion in the accommodating cavity is further assembled between the first contact component 4 and the conductive contact finger 3, and in the switching-off and switching-on process, when an electric arc a is generated between the movable contact 1 and the first contact 41, the baffle component 5 is positioned between the head end of the first contact 41 and the conductive contact finger 3 and used for separating the electric arc a.

According to the contact mechanism, the baffle component 5 is arranged between the first contact 41 and the conductive contact finger 3, when the moving contact 1 performs opening and closing motions, the moving contact 1 is matched with the baffle component 5, and an electric arc a generated between the moving contact 1 and the first contact 41 is blocked and extinguished by the baffle component 5, so that the electric arc a is prevented from damaging the conductive contact finger 3.

An embodiment is provided with reference to fig. 1 to 11, the contact mechanism includes a movable contact 1 and a stationary contact 2 that are engaged with each other, the stationary contact 2 is used as a main current conducting element, an accommodating cavity is provided in the middle of the stationary contact 2, a conductive contact finger 3 is assembled in the accommodating cavity, and when the movable contact 1 extends into the accommodating cavity, the movable contact is electrically connected with the conductive contact finger 3 through plugging engagement. The first contact assembly 4 and the baffle assembly 5 are assembled in the accommodating cavity, the first contact assembly 4 and the baffle assembly 5 penetrate through the middle of the conductive contact finger 3, the first contact assembly 4 comprises a first contact 41 and an elastic energy storage part assembled on the first contact 41, preferably, the elastic energy storage part is assembled at the tail end of the first contact 41, the elastic energy storage part is electrically connected with the accommodating cavity in a sliding mode, the head end of the first contact 41 penetrates through the conductive contact finger 3 and is used for being in plug-in fit with the matching hole 11 at the end part of the movable contact 1, and when the movable contact 1 is in opening and closing motion, the first contact 41 is in plug-in fit with the matching hole 11 and is in common fit with the elastic energy storage part, so that the first contact 41 can perform rapid linear reciprocating motion in the accommodating cavity along a straight line, and the opening and closing speed is increased. Preferably, the first contact 41 and the movable contact 1 move along the same straight line, that is, the central axes of the first contact 41, the accommodating cavity, the conductive contact finger 3 and the movable contact 1 coincide. Of course, the first contact 41 may be replaced by a contact fixedly disposed in the accommodating cavity, but the fixed contact will affect the breaking speed, but will not interfere with the telescopic movement of the shutter assembly 5, so that the shutter assembly 5 can still protect the conductive contact finger 3.

The baffle component 5 is sleeved outside the first contact component 4, the head end of the baffle component 5 is parallel and level with the head end of the first contact 41, preferably, an elastic limit structure is arranged between the head end of the baffle component 5 and the head end of the first contact 41, the baffle component 5 is enabled to be parallel and level by the elastic limit structure, the head end of the first contact 41 is parallel and level, when the moving contact 1 stretches into or is pulled out of the containing cavity to carry out switching-closing movement, the moving contact 1 enables the baffle component 5 to carry out telescopic movement in the containing cavity by jacking the head end of the baffle component 5, when an electric arc a is generated between the moving contact 1 and the head end of the first contact 41, the head end of the baffle component 5 is always positioned between the conductive contact finger 3 and the head end of the first contact 41 to be used for separating and extinguishing the electric arc a, and the conductive contact finger 3 is prevented from being damaged by the electric arc a. In this embodiment, elasticity limit structure includes the spacing portion 411 of elasticity and elasticity block portion 512 that mutually support respectively, and the spacing portion 411 of elasticity sets up on first contact 41, and elasticity block portion 512 sets up the head end at baffle subassembly 5, spacing portion 411 of elasticity, elasticity block portion 512 can be the boss structure of mutually supporting, also can be boss and the groove structure of mutually supporting, and wherein the shape of boss, groove structure does not do specific restriction, and the annular boss that the boss can be continuous or a plurality of boss intervals encircle the setting, and is corresponding, and the groove structure also can be continuous annular groove or a plurality of recess intervals encircle the setting.

Preferably, the head end of the baffle assembly 5 is flush with the head end of the first contact 41 at the opening of the accommodating cavity, so, as shown in fig. 1 and 2, in the closing process, when the movable contact 1 is close to the head end of the first contact 41 to generate an arc a, the head end of the baffle assembly 5 is located between the head end of the first contact 41 and the conductive contact finger 3, the head end of the baffle assembly 5 limits the arc a within a certain range, so as to protect the conductive contact finger 3, subsequently, the movable contact 1 is in top-pressing fit with the head end of the baffle assembly 5 at the opening of the accommodating cavity, the baffle assembly 5 is top-pressed and contracted as the movable contact 1 extends into the accommodating cavity, and simultaneously the first contact 41 is plugged into the mating hole 11 to completely extinguish the arc a, and finally, the movable contact 1 is in plug-fitting fit with the conductive contact finger 3 to complete closing.

As shown in fig. 3-9, in the opening process, the movable contact 1 is separated from the conductive contact finger 3 and disconnected, as the movable contact 1 is pulled out of the accommodating cavity, the head end of the baffle assembly 5 and the movable contact 1 have released the abutting fit, the baffle assembly 5 is located between the head end of the first contact 41 and the conductive contact finger 3 after being stretched and reset, the movable contact 1 and the head end of the first contact 41 are firstly kept inserted and pulled out of the accommodating cavity for a distance, the elastic energy storage member stores energy (see fig. 3, 4 and 9), then the movable contact 1 is separated from the head end of the first contact 41 to generate an arc a, the elastic energy storage member releases energy (see fig. 5 and 8), so that the head end of the first contact 41 is quickly retracted to the opening of the accommodating cavity to be flush with the head end of the baffle assembly 5, so as to realize quick disconnection, and at this time, the arc a is extinguished (see fig. 6), the movable contact 1 further moves towards the opening direction of the opening, a switch break is formed between the movable contact 1 and the stationary contact 2 (see fig. 7).

Further, the fitting hole 11 of the movable contact 1 includes a friction end 111 and an isolation end 112 (see fig. 10), wherein the friction end 111 is located at an end of the fitting hole 11 close to the outside, the friction end 111 is fitted with a head end of the first contact 41 during opening, so that the movable contact 1 drives the first contact 41 to move along the straight line to the outside of the accommodating cavity through friction force of the friction end 111 and the head end of the first contact 41, the isolation end 112 is located at an end of the fitting hole 11 close to the inside, the isolation end 112 is fitted with the head end of the first contact 41 during closing, and no electrical connection exists between the head end of the first contact 41 and the movable contact 1 at this time, thereby preventing the first contact 41 with poor current conduction capability from being electrified for a long time to cause heating and even being burnt.

A specific structure of the movable contact 1 in this embodiment is provided with reference to fig. 10, where the movable contact 1 is integrally rod-shaped, the rightward movement of the movable contact 1 is a closing movement direction, the leftward movement is an opening movement direction, a mating hole 11 is formed in an end portion of the movable contact 1, and in the drawing, the mating hole 11 is preferably a stepped hole with a thin outer end and a thick inner end, where the thin end is used as a friction end 111, the thick end is used as an isolation end 112, and an inner diameter of the friction end 111 is slightly smaller than a head end of the first contact 41, and thus, when the movable contact moves, the head end of the first contact 41 is pulled out of the accommodating cavity by elastic friction between the friction end 111 and the head end of the first contact 41 for a distance; the inner diameter of the isolation end 112 is greater than the outer diameter of the first contact 41, in this embodiment, the outer diameter of the head end of the first contact 41 is the largest, and the inner diameter of the isolation end 112 is preferably greater than the outer diameter of the head end of the first contact 41, so that the two cannot be contacted when the two are in closing insertion fit, thereby achieving isolation. Of course, the fitting hole 11 may be a straight hole with the same inner diameter, the friction end 111 is provided with an elastic material to provide sufficient friction force when the first contact 41 is fitted with the friction end 111, and the isolating end 112 is coated with a different material to provide no electrical connection when the first contact 41 is fitted with the isolating end 112.

As shown in fig. 11, the stationary contact 2 is used as a main conductive element, preferably, a smooth transition structure favorable for optimizing the effect of an electric field is adopted, and one end of the stationary contact 2 facing the moving contact 1 is provided with a large chamfer, the middle part of the stationary contact 2 is provided with an accommodating cavity with at least one open end, and the accommodating cavity is provided with a conductive contact finger 3, a first contact assembly 4 and a baffle assembly 5, so that the stationary contact 2 plays a role in shielding internal parts.

The accommodating cavity comprises a first mounting groove 21 and a second mounting groove 22 which are mutually communicated, the first mounting groove 21 and the second mounting groove 22 are preferably communicated through a connecting hole 23, one end, far away from the second mounting groove 22, of the first mounting groove 21 is open, the inner diameter of the first mounting groove 21 is larger than that of the second mounting groove 22, the inner diameter of the second mounting groove 22 is larger than that of the connecting hole 23, an annular groove 24 is annularly arranged in the first mounting groove 21 along the side wall, preferably, the annular groove 24 is located at one end, far away from the second mounting groove 22, a distance is reserved between the annular groove 24 and the opening of the first mounting groove 21, the annular groove 24 is internally provided with the conductive contact finger 3, and the movable contact 1 extends into the first mounting groove 21 and is spliced with the conductive contact finger 3 to complete switching-on.

As shown in fig. 1-9, the first contact assembly 4 includes a first contact 41, a circlip 45 and a resilient energy storage member, the first contact 41 is a rod structure penetrating the accommodating cavity, the head end of the first contact 41 is located at the opening of the first mounting groove 21 and is used for being inserted into the mating hole 11 of the movable contact 1, the outer side wall of the head end of the first contact 41 protrudes radially to form an annular boss structure, the annular boss structure serves as an elastic limiting part 411 to enable the outer side wall of the head end of the first contact 41 to be in a step structure, the elastic limiting portion 411 is used for being matched with the baffle plate assembly 5, so that the baffle plate assembly 5 is flush with the head end of the first contact 41, in addition, the elastic limiting portion 411 is used as the portion with the largest outer diameter of the first contact 41, so that the head end of the first contact 41 has elasticity, when the first contact 41 is in plug fit with the fitting hole 11, the inner diameters of the friction end 111 and the isolation end 112 of the fitting hole 11 are provided with the outer diameter of the reference elastic limiting part 411; the elastic retainer ring 45 is sleeved on the middle part of the first contact 41, and the elastic retainer ring 45 is positioned in the first mounting groove 21 and can be in limit fit with the first mounting groove 21; the tail end and the elastic energy storage piece of first contact 41 are located second mounting groove 22, elastic energy storage piece includes contact 42, insulating deflector 43 and contact spring 44, contact 42 is fixed to be set up at the tail end of first contact 41 with hold chamber electrical connection, and the contact 42 of this embodiment passes through the fix with screw at the tail end tip of first contact 41, and insulating deflector 43 cover is established at the middle part of first contact 41 and is held the chamber insulation fit, and contact spring 44 cover is established on first contact 41 between contact 42 and insulating deflector 43, contact 42 with hold chamber sliding fit, insulating deflector 43 and second mounting groove 22 fixed connection, specifically fix the one end that second mounting groove 22 is close to first mounting groove 21.

In this embodiment, the inner diameter of the elastic collar 45 is larger than the aperture of the connection hole 23, the outer diameters of the contact piece 42 and the insulating guide plate 43 are the same as the inner diameter of the second installation groove 22, and when the switch is switched on, referring to fig. 1, 2 and 8, the elastic collar 45 is in abutting fit with the side wall of the first installation groove 21 near one end of the connection hole 23, the first contact 41 is limited and cannot be pushed, so that the head end of the first contact 41 overcomes the friction force between the head end and the friction end 111 and extends into the isolation end 112 to complete the plug-in fit; during opening, referring to fig. 3-7 and 9, the friction end 111 cooperates with the head end of the first contact 41 to pull the first contact 41 out of the accommodating cavity (pull the first contact 41 leftward), at this time, the contact 42 is driven to slide toward the first mounting groove 21 (leftward in the figure), the contact spring 44 is compressed to store energy under the action of the contact 42 and the insulating guide plate 43, then, as the movable contact 1 continues to move toward the opening direction, the insulating guide plate 43 cooperates with the second mounting groove 22 to make the first contact 41 unable to be pulled continuously, so that the head end of the first contact 41 is separated from the friction end 111 after overcoming the friction force, at this time, the contact spring 44 releases energy to make the contact 42 slide away from the first mounting groove 21 (rightward in the figure), the first contact 41 retracts into the accommodating cavity, the head end of the first contact 41 is located at the opening of the first mounting groove 21, and the movable contact 1 continues to move, and a brake separating fracture is formed between the movable contact 1 and the first contact 41 of the stationary contact seat 2 and the head end of the baffle assembly 5. It should be noted that, in the first contact 41 of the present embodiment, since the position of the elastic collar 45 abuts against the side wall of the first mounting groove 21 during closing, the first contact 41 does not perform linear motion during closing, but performs linear reciprocating motion only during opening, and of course, the position of the elastic collar 45 may be changed or the length of the first mounting groove 21 may be increased to perform linear reciprocating motion during closing of the first contact 41.

The contact piece 42 is electrically connected with the accommodating cavity all the time, one end of the contact spring 44 is connected with the contact piece 42, the other end of the contact spring 44 is connected with the insulating guide plate 43, so that no current flows through the contact spring 44, and the contact spring 44 is equipotential with the static contact base 2.

As shown in fig. 1 to 9, the baffle plate assembly 5 is circumferentially sleeved outside the first contact 41, the baffle plate assembly 5 is completely located in the first mounting groove 21, and the outer diameter of the baffle plate assembly 5 is smaller than the inner diameter of the conductive contact finger 3, so that the baffle plate assembly 5 does not contact the conductive contact finger 3 during the telescopic movement. The baffle plate assembly 5 comprises an annular baffle plate 51 and an elastic piece 52, the annular baffle plate 51 is made of insulating high-temperature resistant material as the head end of the baffle plate assembly 5, a central hole 511 of the annular baffle plate 51 is used for the first contact 41 to pass through, one end of the central hole 511 of the annular baffle plate 51 close to the elastic piece 52 is provided with a boss as an elastic clamping part 512, the elastic engaging portion 512 protrudes along the circumferential direction of the central hole 511, the elastic engaging portion 512 makes the sidewall of the central hole 511 have a step structure, the inner diameter of the central hole 511 where the elastic engaging portion 512 is provided is smaller than the outer diameter of the first contact 41 where the elastic limiting portion 411 is provided, the inner diameter of the central hole 511 where the elastic engaging portion 512 is not provided is greater than or equal to the outer diameter of the first contact 41 where the elastic limiting portion 411 is provided, and the annular baffle 51 is engaged with the head end of the first contact 41 through the elastic engaging portion 512, so that the annular baffle 51 is flush with the head end of the first contact 41 (see fig. 8). The elastic element 52 is sleeved in the middle of the first contact 41 as the tail end of the baffle plate assembly 5, the elastic force of the elastic element 52 is smaller than the elastic force of the contact spring 44 in the elastic energy storage element, so that the movable contact 1 is in top pressure fit with the baffle plate assembly 5, one end of the elastic element 52 is in insulation connection with the annular baffle plate 51, the other end of the elastic element 52 is in electrical connection with the accommodating cavity, the elastic element is specifically connected to one end, close to the second installation groove 22, of the first installation groove 21, no current flows in the elastic element 52, and the elastic element 52 is equipotential with the stationary contact base 2.

When switching on, the end of the movable contact 1 abuts against the annular baffle 51 and presses the annular baffle 51 to compress the elastic element 52, at this time, the annular baffle 51 gradually retracts into the first mounting groove 21 along with the extension of the movable contact 1, so that the movable contact 1 and the conductive contact finger 3 can be in plug fit, when the movable contact 1 is pulled out of the first mounting groove 21 during switching off, the elastic element 52 releases energy along with the movement of the movable contact 1, and the annular baffle 51 is pushed to return to the opening of the first mounting groove 21 together with the movable contact 1.

It should be noted that the first contact 41 and the annular baffle 51 may not be completely flush, and the head end of the first contact 41 may be slightly retracted into the receiving cavity compared to the annular baffle 51. In addition, the edges of the annular baffle 51, the first contact 41, the movable contact 1, the elastic limiting part 411 and the elastic clamping part 512 adopt arc transition, which is beneficial to improving the mutual matching among the components.

The foregoing is a more detailed description of the utility model in connection with specific preferred embodiments and it is not intended that the utility model be limited to these specific details. For those skilled in the art to which the utility model pertains, several simple deductions or substitutions can be made without departing from the spirit of the utility model, and all shall be considered as belonging to the protection scope of the utility model.

Claims (15)

1. The utility model provides a contact mechanism, is including moving contact (1) and stationary contact (2) that mutually support stationary contact (2) are equipped with and hold the chamber it is equipped with electrically conductive contact finger (3) and first contact subassembly (4) to hold the intracavity, first contact subassembly (4) include with hold first contact (41) that the chamber electricity is connected, moving contact (1) stretches into and holds the intracavity during on-state, sets up at mating holes (11) of moving contact (1) tip and the cooperation of pegging graft of the head end of first contact (41), and the outside and the electrically conductive contact of moving contact (1) indicate (3) cooperation of pegging graft simultaneously, its characterized in that:

and a baffle component (5) capable of performing telescopic motion in the accommodating cavity is further assembled between the first contact component (4) and the conductive contact finger (3), and in the opening and closing process, when an electric arc (a) is generated between the movable contact (1) and the first contact (41), the baffle component (5) is positioned between the head end of the first contact (41) and the conductive contact finger (3) and used for blocking the electric arc (a).

2. A contact mechanism according to claim 1, wherein: in the switching-on process, when the moving contact (1) is close to the head end of the first contact (41) to generate an electric arc (a), the baffle assembly (5) is positioned between the head end of the first contact (41) and the conductive contact finger (3), then the baffle assembly (5) is contracted by jacking of the moving contact (1), the electric arc (a) is extinguished when the first contact (41) is inserted into the matching hole (11), and finally the moving contact (1) is inserted into the conductive contact finger (3) to complete switching-on;

in the process of opening the brake, the moving contact (1) is firstly separated from the conductive contact finger (3) to be powered off, then the moving contact (1) is separated from the head end of the first contact (41) to generate an electric arc (a), and the baffle plate component (5) is reset to enable the baffle plate component (5) to be positioned between the head end of the first contact (41) and the conductive contact finger (3).

3. A contact mechanism according to claim 1, wherein: the first contact assembly (4) further comprises an elastic energy storage piece, when the moving contact (1) performs opening motion, the head end of the first contact (41) is pulled out to be away from the accommodating cavity by a certain distance, the elastic energy storage piece stores energy, and after the head end of the first contact (41) is separated from the moving contact (1), the elastic energy storage piece releases energy to enable the head end of the first contact (41) to fast retreat into the accommodating cavity.

4. A contact mechanism according to claim 3, wherein: the head end of the baffle plate component (5) is flush with the head end of the first contact (41) at the opening of the accommodating cavity.

5. A contact mechanism according to claim 3, wherein: one end, close to the outside, of the matching hole (11) is a friction end (111), and when the brake is switched off, the head end of the first contact (41) is matched with the friction end (111) to pull the first contact (41) to move along with the movable contact (1), so that the elastic energy storage part stores energy; one end, close to the inside, of the matching hole (11) is an isolating end (112), when the switch is switched on, the head end of the first contact (41) overcomes the friction force between the head end and the friction end (111) and then extends into the isolating end (112), and no electrical connection exists between the isolating end (112) and the first contact (41).

6. A contact arrangement according to claim 5, wherein: the fitting hole (11) is a stepped hole with a thick inner end and a thin outer end, the thick end is an isolation end (112), the inner diameter of the isolation end (112) is larger than the outer diameter of the head end of the first contact (41), and the inner diameter of the friction end (111) is smaller than the outer diameter of the elastic head end of the first contact (41).

7. A contact arrangement according to any of claims 1-6, wherein: an elastic limiting structure is arranged between the head end of the baffle plate assembly (5) and the head end of the first contact (41), and the head end of the baffle plate assembly (5) and the head end of the first contact (41) are kept flush by the elastic limiting structure.

8. A contact mechanism according to claim 3, wherein: the outer side wall of the head end of the first contact (41) protrudes along the radial direction to form an annular boss structure, the annular boss structure serves as an elastic limiting portion (411), the head end of the baffle plate assembly (5) is flush with the head end of the quick contact through matching with the elastic limiting portion (411), and the first contact (41) and the moving contact (1) move along the same straight line.

9. A contact mechanism according to claim 3, wherein: elastic energy storage spare includes contact (42), insulating deflector (43) and contact spring (44), contact (42) are fixed to be set up at the tail end of first contact (41) and with hold chamber electrical connection, insulating deflector (43) cover establish the middle part of first contact (41) with hold chamber insulation fit, contact spring (44) cover establish on first contact (41) between contact (42) and insulating deflector (43), contact (42) with hold chamber sliding fit, insulating deflector (43) with hold chamber fixed connection.

10. A contact mechanism according to claim 1, wherein: the baffle plate assembly (5) comprises an annular baffle plate (51) and an elastic piece (52), a central hole (511) of the annular baffle plate (51) is used for the first contact (41) to pass through, the elastic piece (52) is sleeved on the middle part of the first contact (41), one end of the elastic piece (52) is connected with the annular baffle plate (51) in an insulating mode, and the other end of the elastic piece (52) is connected with the accommodating cavity.

11. A contact mechanism as claimed in claim 10, wherein: one end of a central hole (511) of the annular baffle plate (51), which is close to the elastic piece (52), is provided with a boss serving as an elastic clamping part (512), the elastic clamping part (512) protrudes along the annular shape of the central hole (511), and the annular baffle plate (51) is clamped with the head end of the first contact (41) through the elastic clamping part (512), so that the annular baffle plate (51) is flush with the head end of the first contact (41).

12. A contact mechanism according to claim 1, wherein: the inside wall that holds the chamber is equipped with ring channel (24) along the hoop, electrically conductive contact finger (3) set up in ring channel (24), and the external diameter of baffle subassembly (5) is less than the internal diameter of electrically conductive contact finger (3).

13. A contact mechanism according to claim 3, wherein: the holding cavity comprises a first mounting groove (21) and a second mounting groove (22) which are communicated with each other, the baffle plate assembly (5) and the conductive contact finger (3) are located in the first mounting groove (21), the first contact (41) penetrates through the first mounting groove (21) and the second mounting groove (22), the head end of the first contact (41) and the head end of the baffle plate assembly (5) are flush with one end opening of the first mounting groove (21) away from the second mounting groove (22), and the elastic energy storage piece arranged on the first contact (41) is located in the second mounting groove (22) and is in sliding fit with the second mounting groove (22).

14. A contact mechanism as claimed in claim 13, wherein: the internal diameter of second mounting groove (22) is less than the internal diameter of first mounting groove (21), second mounting groove (22) and first mounting groove (21) are through a connecting hole (23) intercommunication, the internal diameter of connecting hole (23) is less than the internal diameter of second mounting groove (22).

15. A contact mechanism as claimed in claim 13, wherein: the middle part of the first contact (41) is further sleeved with an elastic check ring (45), and in the switching-on process, the elastic check ring (45) and the side wall of one end, close to the connecting hole (23), of the first installation groove (21) abut against and are matched with each other, so that the head end of the first contact (41) is connected with the matching hole (11) of the movable contact (1) in an inserting mode.

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