CN210110587U

CN210110587U - Direct current fast switch

Info

Publication number: CN210110587U
Application number: CN201921351262.7U
Authority: CN
Inventors: 李启辉; 吴锦松; 薛建和
Original assignee: XIAMEN ANDAXING ELECTRICAL GROUP CO Ltd
Current assignee: XIAMEN ANDAXING ELECTRICAL GROUP CO Ltd
Priority date: 2019-08-20
Filing date: 2019-08-20
Publication date: 2020-02-21
Anticipated expiration: 2029-08-20

Abstract

The utility model discloses a direct current fast switch relates to electrical switch technical field, which comprises a base, two explosion chambers, be located two static contacts and two moving contacts between two explosion chambers, the mechanical hold mechanism and the electromagnetic drive mechanism of drive machinery hold mechanism motion of being connected with two moving contacts, static contact fixed mounting is on the base, two static contacts form double fracture with two moving contacts relatively respectively, electromagnetic drive mechanism is got electric and drive machinery hold mechanism during combined floodgate, machinery hold mechanism makes moving contact and static contact joint, machinery hold mechanism resets during separating brake, the moving contact separates with the static contact. The utility model provides a direct current fast switch has add mechanical holding mechanism, keeps the combined floodgate state by mechanical holding mechanism, and electromagnetic driving mechanism can the break off power supply, increases electromagnetic driving mechanism's life, uses mechanical holding mechanism to carry out rigid switch-on, has eliminated the combined floodgate and has shortly quivered the contact that the emergence arc broke down and cause in the twinkling of an eye and has burnt the loss.

Description

Direct current fast switch

Technical Field

The utility model relates to an electrical switch technical field especially relates to a direct current fast switch.

Background

As shown in fig. 1, a conventional dc fast switch 10 includes a movable contact 101, a fixed contact 102, and an arc extinguish chamber 103, the movable contact 101 is connected to an electromagnetic driving mechanism 104, the fixed contact 102 is connected to a fixed electrode 105, the movable contact 101 is contacted with or separated from the fixed contact 102 by a swing link 106, the swing link 106 has a swing fulcrum 107, the swing link 106 is connected to another fixed electrode 105, and the swing link 106 swings under the action of the electromagnetic driving mechanism 104. This direct current fast switch 10 adopts single fracture, single explosion chamber, electro-magnet to keep closing a floodgate, has following shortcoming:

1. the single fracture and the single arc extinguishing chamber have limited arc extinguishing capability due to insufficient driving force;

2. electromagnetic drive closes a floodgate, does not have mechanical hold mechanism, and closing a floodgate holding coil and need be circular telegram always, has seriously influenced coil life and extravagant energy.

3. Because the closing of the switch is only kept by the attraction of the electromagnet, short-time vibration can be generated during closing, so that the arc discharge and burning loss of the contact are caused, and the service life of the contact is seriously influenced.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems of the prior art, the utility model provides a direct current fast switch.

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

a direct current fast switch comprises a base, two arc extinguish chambers, two static contacts and two moving contacts which are positioned between the two arc extinguish chambers, a mechanical holding mechanism connected with the two moving contacts, and an electromagnetic driving mechanism driving the mechanical holding mechanism to move, wherein the static contacts are fixedly arranged on the base, the two static contacts are respectively opposite to the two moving contacts to form double fractures, the electromagnetic driving mechanism is electrified and drives the mechanical holding mechanism when the switch is switched on, the mechanical holding mechanism enables the moving contacts to be connected with the static contacts, the mechanical holding mechanism resets when the switch is switched off, and the moving contacts are separated from the static contacts.

Furthermore, the mechanical holding mechanism comprises a swing rod and a limiting pawl, a rotating shaft is connected to the middle of the swing rod and assembled on the base, the swing rod swings relative to the base by taking the rotating shaft as a fulcrum, a kidney-shaped hole is formed in one end of the swing rod, the end portion of the movable contact is connected to the kidney-shaped hole in a sliding mode, the limiting pawl is located on a swinging path of the other end of the swing rod, the limiting pawl is rotatably installed on the base and provided with a notch portion and a limiting portion, and the limiting pawl is rotated to enable the limiting portion to block the swing of the swing rod so that the movable contact and the static contact are kept in a closed state, or the swing rod smoothly penetrates through the notch portion to achieve swing, and then brake opening is.

Furthermore, the mechanical holding mechanism further comprises a tension spring, one end of the tension spring is fixedly connected to the swing rod, the other end of the tension spring is fixedly connected to the base, the tension spring is stretched during closing, and the tension spring pulls the swing rod to rotate during opening.

Furthermore, the action point of the electromagnetic driving mechanism on the swing rod and the action point of the tension spring on the swing rod are distributed on two sides of the pivot of the swing rod.

Compared with the prior art, the utility model has the advantages of it is following:

1. the double-fracture and double-arc-extinguishing chamber are adopted, when a circuit is switched on and switched off, the current directions of electric arcs formed by the two fractures are opposite, and the self-excitation fields of the two electric arcs repel each other, so that the electric arcs of the two fractures are led into the arc-extinguishing chambers on the two sides, and the characteristics of the current and the electromagnetic field are fully utilized, so that the arc-extinguishing effect is greatly improved.

2. The mechanical holding mechanism is additionally arranged, when the pulse current is used for driving the electromagnetic driving mechanism to be switched on, the mechanical protection mechanism is used for holding the switching-on state, and the electromagnetic driving mechanism can be used for disconnecting the power supply, so that the service life of the electromagnetic driving mechanism is greatly prolonged, and the effect of saving energy is achieved.

3. The mechanical holding mechanism is used for rigid switching on, contact burning loss caused by arc discharge due to short-time vibration at the moment of switching on is eliminated, and therefore the service life of the contact is greatly prolonged.

Drawings

FIG. 1 is a schematic diagram of a prior art DC fast switch;

fig. 2 is a schematic diagram of a dc fast switch according to an embodiment of the present invention;

FIG. 3 is a schematic view showing the positional relationship between the swing link and the limiting pawl in the brake-off state;

FIG. 4 is a schematic diagram of a position relationship between a swing rod and a limiting pawl in a closing state;

FIG. 5 is a schematic perspective view of the swing link and the limiting pawl in a closing state;

fig. 6 is another angular view of fig. 5.

Detailed Description

The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 2, a dc fast switch includes a base, two arc extinguish chambers 203, two fixed contacts 202 and two moving contacts 201 between the two arc extinguish chambers 203, a mechanical holding mechanism 205 connected to the two moving contacts 201, and an electromagnetic driving mechanism 204 driving the mechanical holding mechanism 205 to move, the fixed contacts 202 are fixedly mounted on the base, the two fixed contacts 202 respectively form a double break with the two moving contacts 201, the electromagnetic driving mechanism 204 is powered and drives the mechanical holding mechanism 205 when switching on, the mechanical holding mechanism 205 connects the moving contacts 201 with the fixed contacts 202, the mechanical holding mechanism 205 resets when switching off, and the moving contacts 201 are separated from the fixed contacts 202.

The two arc extinguishing chambers 203 are respectively adjacent to the two fractures, the current configuration of the two fractures is that the current passes through one static contact 202, then sequentially flows through the two moving contacts 201, and then flows through the other static contact 202, so that the two switch fractures generate two electric arcs with opposite current directions when the switch is switched off, the self-energizing magnetic fields of the two electric arcs are mutually exclusive, the electric arcs generated by the two fractures are automatically led into the arc extinguishing chambers 203 on the two sides, and the rapid arc extinction is realized.

As shown in fig. 3 to 6, the mechanical holding mechanism 205 includes a swing rod 2051 and a limiting latch 2052, the middle portion of the swing rod 2051 is connected to a rotating shaft 2053, the rotating shaft 2053 is assembled on the base, the swing rod 2051 swings relative to the base with the rotating shaft 2053 as a pivot, one end of the swing rod 2051 is provided with a kidney-shaped hole, the end portion of the movable contact 201 is slidably connected in the kidney-shaped hole, the limiting latch 2052 is located on a swing path of the other end of the swing rod 2051, the limiting latch 2052 is rotatably installed on the base, the limiting latch 2052 is provided with a notch portion 20522 and a limiting portion 20521, and the rotation of the limiting latch 2052 can enable the limiting portion 20521 to block the rotation of the swing rod 2051 so as to keep the movable contact 201 and the fixed contact 202 in a closed state, or enable the swing rod 2051 to smoothly pass through.

The limiting detent 2052 is preferably rod-shaped, so that the rotation of the limiting detent 2052 relative to the base can be achieved by various schemes, referring to the prior art. Another electromagnetic driving mechanism 204 may also be used to drive the limiting pawl 2052 to rotate, specifically: a connecting block is adopted, one end of the connecting block is fixedly connected with the limiting pawl 2052, the other end of the connecting block is positioned on a motion path of an iron core of the electromagnetic driving mechanism 204, when the electromagnetic driving mechanism 204 is electrified, the iron core moves in a direction vertical to the limiting pawl 2052 and pushes the connecting block to rotate, namely, the limiting pawl 2052 rotates relative to the base.

The mechanical holding mechanism 205 further includes a tension spring 2054, one end of the tension spring 2054 is fixedly connected to the swing rod 2051, and the other end of the tension spring 2054 is fixedly connected to the base, as shown in fig. 3 and 4, an acting point of the electromagnetic driving mechanism 204 on the swing rod 2051 and an acting point of the tension spring 2054 on the swing rod 2051 are distributed on two sides of a fulcrum of the swing rod 2051, the tension spring 2054 is extended when the switch is closed, and the tension spring 2054 pulls the swing rod 2051 to rotate when the switch is opened.

The electromagnetic driving mechanism 204 is connected with a movable electrode 207, the principle and structure of the electromagnetic driving mechanism 204 are the prior art in the field, and the electromagnetic driving mechanism comprises an iron core, a framework sleeved on the iron core and a coil wound on the framework, and after the electromagnetic driving mechanism 204 is electrified, the iron core moves linearly. The working principle of the dc fast switch 20 provided by the present embodiment is as follows:

the static contact 202 is fixedly installed on the base, and when the switch is switched on, the electromagnetic driving mechanism 204 is electrified to drive the moving contact 201 to move, so that the moving contact 201 is connected with the static contact 202, and the switch is closed. Meanwhile, the mechanical holding mechanism 205 operates to hold the movable contact 201 and the stationary contact 202 in a closed state, and the electromagnetic driving mechanism 204 is powered off after a delay.

During opening, as shown in fig. 3, the mechanical holding mechanism 205 rotates under the action of the tension spring 2054, the moving contact 201 is separated from the stationary contact 202, and the arcs at the two ends of the moving contact 201 enter the arc extinguishing chamber 203 for arc extinguishing from the two ends under the pushing of the interaction force.

The above description is only an embodiment utilizing the technical content of the present disclosure, and any modification and variation made by those skilled in the art can be covered by the claims of the present disclosure, and not limited to the embodiments disclosed.

Claims

1. A kind of direct current fast switch, characterized by: the electromagnetic driving mechanism is electrified and drives the mechanical holding mechanism when the switch is switched on, the mechanical holding mechanism enables the movable contact to be connected with the fixed contact, the mechanical holding mechanism resets when the switch is switched off, and the movable contact is separated from the fixed contact.

2. The dc fast switch according to claim 1, wherein: the mechanical holding mechanism comprises a swing rod and a limiting pawl, a rotating shaft is connected to the middle of the swing rod, the rotating shaft is assembled on the base, the swing rod swings relative to the base by taking the rotating shaft as a fulcrum, a kidney-shaped hole is formed in one end of the swing rod, the end portion of the movable contact is connected to the kidney-shaped hole in a sliding mode, the limiting pawl is located on a swinging path of the other end of the swing rod, the limiting pawl is rotatably installed on the base and provided with a gap portion and a limiting portion, the swing rod can be enabled to be in a closed state by the aid of the limiting portion in a blocking mode through rotation of the swing rod by rotating the limiting pawl, or the swing rod smoothly penetrates through the gap portion to achieve rotation.

3. The dc fast switch according to claim 2, wherein: the mechanical holding mechanism further comprises a tension spring, one end of the tension spring is fixedly connected to the swing rod, the other end of the tension spring is fixedly connected to the base, the tension spring is stretched during closing, and the tension spring pulls the swing rod to rotate during opening.

4. The dc fast switch according to claim 3, wherein: the action point of the electromagnetic driving mechanism on the swing rod and the action point of the tension spring on the swing rod are distributed on two sides of the pivot of the swing rod.