CN216528704U - Air switch with automatic circuit breaking and automatic closing functions - Google Patents

Abstract

The utility model relates to the technical field of air switches, in particular to an air switch with automatic circuit breaking and automatic closing functions, which comprises a box body shell and a left fixed contact, wherein the left fixed contact is positioned at the leftmost side in the box body shell; according to the utility model, through the U-shaped safety piece, the double-layer metal piece, the left connecting rod, the upper connecting rod, the moving contact and the return spring, when the current is large or overloaded, the tripping condition occurs, manual reset is not needed, and when the current is normal, the air switch can automatically reset under the action of the return spring, so that the manpower resource is saved.

Description

Air switch with automatic circuit breaking and automatic closing functions

Technical Field

The utility model relates to the technical field of air switches, in particular to an air switch with automatic circuit breaking and closing functions.

Background

An air switch, also called an air circuit breaker, is a kind of circuit breaker, is a switch that can automatically break off as long as the current in the circuit exceeds the rated current, and is an electrical appliance very important in low-voltage distribution network and electric power drive system, it integrates control and multiple protection functions, besides can complete contact and break circuit, it can also protect short circuit, serious overload and undervoltage, etc. caused by circuit or electrical equipment, and can also be used for starting the motor infrequently at the same time.

Most of existing air switches cannot be automatically reset after being opened under abnormal working conditions, manual reset is needed, and in the using process of some unattended equipment, after the manually reset air switches are tripped, people need to be sent to the air switches to manually reset, so that human resources are wasted.

Disclosure of Invention

The present invention is directed to an air switch having automatic opening and closing functions to solve the above problems of the related art.

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

an air switch with automatic circuit breaking and automatic closing functions comprises a box body shell and a left fixed contact, wherein the leftmost side in the box body shell is fixedly connected with the left fixed contact, the right end face of the left fixed contact is fixedly connected with a U-shaped safety piece, the right side of the U-shaped safety piece is fixedly connected with one side of a double-layer metal piece, the other side of the double-layer metal piece is connected with an electromagnetic coil through a lead, a movable cylindrical electromagnetic iron core is arranged in the electromagnetic coil, the right side of the electromagnetic coil is fixedly connected with a metal moving contact through a flexible lead, an insulating upper connecting rod is arranged above the electromagnetic coil, the left side of the upper connecting rod is rotatably connected with an insulating left connecting rod through a rotating shaft, a left unit rotating shaft is rotatably connected in the left connecting rod, the front end face and the rear end face of the left unit rotating shaft are fixedly connected with the box body shell, the right end of the upper connecting rod is rotatably connected with the metal moving contact through the rotating shaft, the moving contact is characterized in that a right unit rotating shaft is rotatably connected inside the moving contact, the left end face and the right end face of the right unit rotating shaft are fixedly connected with the box body shell, a return spring is arranged on the right unit rotating shaft, a right fixed contact is arranged on the right side of the moving contact, and the right fixed contact is fixedly connected with the box body shell.

Preferably, the electromagnetic coil fixing device further comprises a thermal trigger adjusting member, wherein the thermal trigger adjusting member is fixedly connected with the box body shell and serves as a fixing support of the electromagnetic coil.

Preferably, an arc extinguisher is arranged below the thermal trigger adjusting member, and two sides of the arc extinguisher are fixedly connected with the box body shell.

Preferably, the thermal trigger adjusting member is arranged in a mountain-shaped frame, a convex plate is fixedly connected to the lower end face of the thermal trigger adjusting member, and the right side of the convex plate is fixedly connected with the double-layer metal sheet.

Preferably, both sides all are equipped with the spacing ring around the left connecting rod, are located the front side the spacing ring inboard with left unit pivot fixed connection, both sides all are equipped with the spacing ring around the moving contact, are located the rear side the spacing ring inboard with right unit pivot fixed connection.

Preferably, the right side surface of the left connecting rod is tightly attached to the left end surface of the cylindrical electromagnetic iron core. The left end face of the cylindrical electromagnetic iron core is flush with the left end face of the electromagnetic coil.

Preferably, the upper end face of the double-layer metal sheet is flush with the upper end face of the upper connecting rod.

Preferably, a damping force exists between the electromagnetic core and the electromagnetic coil, when the current is in a normal value range, the electromagnetic force applied to the electromagnetic core is smaller than the damping force, and the electromagnetic core cannot move leftwards

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the utility model, through the U-shaped safety piece, the double-layer metal piece, the electromagnetic core, the electromagnetic coil, the left connecting rod, the upper connecting rod, the moving contact and the return spring, when the current is large or overloaded, the tripping condition occurs, manual reset is not needed, and when the current is normal, the air switch can automatically reset under the action of the return spring, so that the manpower resource is saved;

2. according to the utility model, through the arrangement of the double-layer metal sheet, the electromagnetic core and the electromagnetic coil, when the current of the electromagnetic core is larger, the electromagnetic core moves leftwards to push the left connecting rod, so that the whole connecting rod mechanism is driven to move, the elastic force moment of a return spring is overcome, the movable contact is separated from the right fixed contact, and then automatic circuit breaking is realized;

3. according to the utility model, through the return spring, the right unit rotating shaft, the left unit rotating shaft and the limiting ring, the arrangement of the limiting ring ensures that the left connecting rod and the moving contact cannot move back and forth, ensures the transmission of motion and force between the connecting rod mechanisms, forms a stable and reliable executing device for separating and closing, and ensures the stable separation and contact between the moving contact and the right fixed contact.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a cross-sectional view of the housing shell of the case of the present invention;

FIG. 3 is a schematic view of a return spring according to the present invention;

FIG. 4 is a schematic view of the coupling mechanism of the present invention;

FIG. 5 is a schematic structural view of the present invention during normal operation;

FIG. 6 is a schematic diagram of the structure of the present invention when the current is too large;

fig. 7 is a schematic structural diagram of the present invention when the current is overloaded.

In the figure: 1-left fixed contact, 2-U-shaped safety piece, 3-thermal trigger adjusting component, 4-double-layer metal piece, 5-electromagnetic iron core, 6-electromagnetic coil, 7-left connecting rod, 8-upper connecting rod, 9-moving contact, 10-right fixed contact, 11-box shell, 12-arc extinguisher, 13-return spring, 14-right unit rotating shaft, 15-left unit rotating shaft and 16-spacing ring.

Detailed Description

Example 1:

referring to fig. 1-7, the present invention provides a technical solution:

the utility model provides an air switch with automatic function that opens circuit and closes automatically, decides contact 1 including box shell 11 and a left side, and contact 1 is decided on the left side to the inside fixed connection of box shell 11, and 1 right-hand member fixedly connected with U type rupture disc 2 of contact is decided on a left side, and U type rupture disc 2 is fixed hugs closely one side that has double-deck sheetmetal 4, and double-deck sheetmetal 4 opposite side with be connected with solenoid through the wire. The thermal trigger adjusting component is used as a fixed support of the electromagnetic coil and is positioned below the electromagnetic coil, and a movable cylindrical electromagnetic iron core is arranged in the electromagnetic coil. The right side of the electromagnetic coil is fixedly connected with a metal moving contact through a flexible conducting wire, an insulating upper connecting rod 8 is arranged above the electromagnetic coil 6, the left side of the upper connecting rod 8 is rotatably connected with an insulating left connecting rod through a rotating shaft, the inside of a left connecting rod 7 is rotatably connected with a left unit rotating shaft, the front end surface and the rear end surface of a left unit rotating shaft 15 are fixedly connected with a box body shell, the right end of the upper connecting rod 8 is rotatably connected with a metal moving contact 9 through a rotating shaft, the inside of the moving contact 9 is rotatably connected with a right unit rotating shaft 14, the left end surface and the right end surface of the right unit rotating shaft 14 are fixedly connected with the box body shell, a return spring is arranged on the right unit rotating shaft 14, a right fixed contact 10 is arranged on the right side of the moving contact 9, the right fixed contact 10 is fixedly connected with the box body shell 11, the U-shaped safety sheet 2 can heat the double-layer metal sheet 4 to further deform towards the right side, then the upper connecting rod 8 is pushed to realize the force transmission, and then the moving contact 9 is separated from the right fixed contact 10, the purpose of realizing automatic circuit breaking is realized, an arc extinguisher 12 is arranged below a thermal trigger adjusting component 3, the outer side of the arc extinguisher 12 is fixedly connected with a box body shell 11, the arc extinguisher 12 starts the arc extinction function, the thermal trigger adjusting component 3 is arranged in a frame shape, a convex plate is arranged on the lower end surface of the thermal trigger adjusting component 3, the convex plate and a double-layer metal sheet 4 are used as a left clamping plate and a right clamping plate to clamp a U-shaped safety plate 2, the front side and the rear side of a left connecting rod 7 are both provided with limiting rings 16, the inner side of the limiting ring 16 positioned on the front side is fixedly connected with a left unit rotating shaft 15, the front side and the rear side of a movable contact 9 are both provided with limiting rings 16, the inner side of the limiting ring 16 positioned on the rear side is fixedly connected with a right unit rotating shaft 14, the arrangement of the limiting rings 16 ensures that the left connecting rod 7 and the movable contact 9 are not easy to move back and forth, and forth under the action of the limiting rings 16, the left connecting rod 7, the upper connecting rod 8 and the movable contact 9 are positioned on the same plane, thereby forming a reliable executing device with stable separation and closing, ensure separation and the contact between moving contact and the right fixed contact, answer spring 13 sets up in the right unit pivot 14 outside, answer spring 13 one end and moving contact 9 fixed connection, answer spring 13 other end and right unit pivot 14 fixed connection, terminal surface and box shell 11 fixed connection about the thermal trigger adjusting member 3, 4 up end of double-deck sheetmetal and 8 up end parallel and level of upper link, this kind of setting guarantees that double-deck sheetmetal 4 takes place to deform and can promote the 8 removals of upper link, thereby make moving contact 9 and the right fixed contact 10 separation of deciding, realize automatic circuit breaking.

The working process is as follows: when the automatic air switch is used, the power supply is switched on, when the current is in the normal value range, under the normal working condition of the automatic air switch, for the moving contact 9, the anticlockwise moment generated by the return spring 13 is greater than the clockwise moment generated under the combined action of the current in the electromagnetic coil 6 through the electromagnetic iron core 5 and the link mechanism, so that the return spring 13 drives the moving contact 9 to rotate anticlockwise, further the contact with the right fixed contact 10 is realized, and the normal use of the air switch is realized,

example 2:

in embodiment 2, the same parts as those in embodiment 1 will not be described again, except that when the working current is suddenly excessive but not overloaded, the electromagnet core 5 in the electromagnet coil 6 moves leftwards due to the thrust generated by the excessive current, pushes the lower end of the left connecting rod 7, overcomes the elastic moment of the return spring 13, and accordingly the air switch is turned off when the current is excessive but not overloaded,

when the current returns to normal, under the action of the elastic force moment of the return spring 13, the movable contact 9 drives the upper connecting rod 8 to move left under the action of the right unit rotating shaft 14, the upper connecting rod 8 drives the left connecting rod 7 to rotate anticlockwise so as to push the electromagnetic iron core 5 to move right and return, the movable contact 9 is in contact with the right fixed contact 10 again, the movable contact 9 is in contact with the right fixed contact 10 to form a current path, and the automatic air switch continues to work.

Example 3:

in embodiment 3, the same parts as those in embodiments 1 and 2 are not described again, except that when the air switch is overloaded, the U-shaped safety piece 2 generates heat and transfers the heat to the double-layer metal piece 4, because the two metal pieces 4 are bent to the right side due to different thermal deformation degrees, the upper connecting rod 8 is pushed to move to the right, the elastic moment of the return spring 13 is overcome, the circuit is disconnected, when the overload disappears, the temperature of the U-shaped safety piece 2 drops, the double-layer metal piece 4 is deformed and disappears, the upper connecting rod 8 is not pushed any more, and the double-safety mechanism in overload is formed by matching with embodiment 2.

The principles and embodiments of the present invention have been described herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes may be made without departing from the principle of the present invention, and the technical features described above may be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the utility model using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.

Claims (9)

1. An air switch with automatic circuit breaking and automatic closing functions comprises a box body shell (11) and a left fixed contact (1), and is characterized in that: the electromagnetic coil is characterized in that the left fixed contact (1) is located on the leftmost side in the box body shell (11), the right end face of the left fixed contact (1) is fixedly connected with a U-shaped safety piece (2), the right end of the U-shaped safety piece (2) is fixedly connected with one side of the lower end of a double-layer metal sheet (4), the other side of the lower end of the double-layer metal sheet (4) is connected with an electromagnetic coil (6) through a wire, a movable electromagnetic iron core (5) is arranged in the electromagnetic coil (6), the right end of the electromagnetic coil (6) is connected with a metal moving contact (9) through a flexible wire, an insulating upper connecting rod (8) is arranged above the electromagnetic coil (6), the left end of the upper connecting rod (8) is rotatably connected with an insulating left connecting rod (7) through a rotating shaft, a left unit rotating shaft (15) is rotatably connected in the left connecting rod (7), and the front end face and the back end face of the left unit rotating shaft (15) are fixedly connected with the box body shell (11), go up connecting rod (8) right-hand member and rotate through the pivot and connect moving contact (9), the inside rotation of moving contact (9) is connected with right unit pivot (14), right unit pivot (14) both ends all with box shell (11) fixed connection, right unit pivot (14) are equipped with answer spring (13), counter-clockwise moment is applyed to moving contact (9) in answer spring (13), moving contact (9) right side is equipped with the right side and decides contact (10), contact (10) and box shell (11) fixed connection are decided on the right side.

2. An air switch with automatic opening and closing functions as claimed in claim 1, wherein: still include with box shell (11) fixed connection's thermal trigger adjusting part (3) and arc extinguisher (12), solenoid (6) are located thermal trigger adjusting part (3) top, arc extinguisher (12) are located thermal trigger adjusting part (3) below, arc extinguisher (12) and box shell (11) fixed connection.

3. An air switch with automatic opening and closing functions as claimed in claim 1, wherein: the double-layer metal sheet (4) is positioned right in front of the left side of the left connecting rod (7).

4. An air switch with automatic opening and closing functions as claimed in claim 2, wherein: thermal trigger regulating means (3) are the frame setting, the left side opening of thermal trigger regulating means (3) bottom, the terminal surface is equipped with the flange under thermal trigger regulating means (3), double-deck sheetmetal (4) are followed pass in the opening, and double-deck sheetmetal (4) lower extreme left surface and flange right flank fixed connection.

5. An air switch with automatic opening and closing functions as claimed in claim 1, wherein: both sides all are equipped with spacing ring (16) around left connecting rod (7), are located the front side spacing ring (16) inboard and left unit pivot (15) fixed connection, both sides all are equipped with spacing ring (16) around moving contact (9), are located the rear side spacing ring (16) inboard and right unit pivot (14) fixed connection.

6. An air switch with automatic opening and closing functions as claimed in claim 1, wherein: the return spring (13) is arranged on the outer side of the right unit rotating shaft (14), one end of the return spring (13) is connected with the moving contact (9), and the other end of the return spring (13) is connected with the right unit rotating shaft (14).

7. An air switch with automatic opening and closing functions as claimed in claim 1, wherein: the electromagnetic iron core (5) is cylindrical, the right side face of the left connecting rod (7) is tightly attached to the cylindrical left end face of the electromagnetic iron core (5), and the moving contact (9) is located at the right end of the electromagnetic iron core (5).

8. An air switch with automatic opening and closing functions as claimed in claim 2, wherein: the front end face and the rear end face of the thermal trigger adjusting component (3) are fixedly connected with the box body shell (11), and the upper end face of the double-layer metal sheet (4) is flush with the upper end face of the upper connecting rod (8).

9. An air switch with automatic opening and closing functions as claimed in claim 1, wherein: damping force exists between the electromagnetic core (5) and the electromagnetic coil, when current is in a normal value range, the electromagnetic force borne by the electromagnetic core (5) is smaller than the damping force, and the electromagnetic core (5) cannot move leftwards.

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