CN113241291A

CN113241291A - Novel bistable air switch with self-resetting function and self-resetting method

Info

Publication number: CN113241291A
Application number: CN202110501685.8A
Authority: CN
Inventors: 李明丽; 潘海洋
Original assignee: Anhui University of Technology AHUT
Current assignee: Anhui University of Technology AHUT
Priority date: 2021-05-08
Filing date: 2021-05-08
Publication date: 2021-08-10
Anticipated expiration: 2041-05-08
Also published as: CN113241291B

Abstract

The invention relates to the technical field of power equipment, power system safety protection and air switches, and discloses a novel bistable air switch device with a self-resetting function, wherein a bistable beam, a cam and a self-resetting circuit are added on the basis of the conventional air switch; after the displacement of the bistable lever is amplified, the rotation angle of the hook is increased, so that a self-reset circuit above the hook is switched on, the hook is forced to drive the bistable lever to move through the rotation of the cam under the action of the motor, when the bistable lever moves to the jump displacement of the bistable beam, the jump of the bistable beam drives the hook to be switched on with the lock chain, at the moment, the hook is separated from the cam, the self-reset circuit is switched off, and the self-reset circuit is simple in structure and wide in application range.

Description

Novel bistable air switch with self-resetting function and self-resetting method

Technical Field

The invention relates to the technical field of power equipment, power system safety protection and air switches, in particular to a novel bistable air switch with a self-resetting function and a self-resetting method.

Background

The air switch is a switch which can be automatically switched off when the current in the circuit exceeds the rated current, has the functions of overheat protection, overcurrent protection and undervoltage protection, and plays an important role in protecting industrial power utilization and household power utilization.

The main problems of the existing air switch are as follows: 1) most air switches do not have a self-resetting function after tripping, so that the power failure time is prolonged, and the power supply service quality and the production efficiency of enterprises are influenced. 2) The self-reset structure is complex, and the production cost is increased. 3) There is a limitation in the range of use of the self-resetting air switch. The current research on air switches mainly aims at: 1) novel configuration of air switch. Such as a screw-type air switch (see patent publication No. CN204516619U for details), which although simplified the installation and removal procedure; but the air switch needs manual operation, and the detection and automatic reset functions of the air switch cannot be realized. 2) Detection system of air switch. For example, patent No. CN105356621A, which realizes the detection of the air switch by adding a network to connect with the corresponding communication device, but the automatic reset problem is not well dealt with. 3) Self-resetting system of air switch. For example, the patent with publication number CN204681069 solves the problem of automatic reset of the air switch, but structurally increases the manufacturing and use costs due to the addition of elements such as a low-voltage air switch, a current transformer, a voltage transformer, etc.; the range of the application field is small, and the low-voltage air switch is mainly used for distribution transformer low-voltage air switches.

Aiming at the limitation of the research status of the air switch, the invention provides a novel bistable air switch with a self-resetting function and a self-resetting method.

Disclosure of Invention

The invention provides a novel bistable air switch with a self-reset function and a self-reset method, aiming at the problems brought forward in the technical background. The air switch of this paper design has guaranteed the commonality that the air switch used on the one hand, and on the other hand has solved the self-reset function that current air switch does not have.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a novel bistable state air switch who possesses from reset function, includes the basic air switch who comprises spring, main contact, chain, hasp, axle, lever, armature, under voltage detacher, heating element, bimetallic strip and electromagnetism release, the fixed bistable state roof beam that is provided with on the lever, lever and bistable state roof beam combine to constitute bistable state lever, bistable state roof beam is elastic arc strip, the shell structure rigid coupling in the both ends of bistable state roof beam and the basic air switch, be equipped with contact self-reset mechanism in the basic air switch, contact self-reset mechanism establishes in one side of hasp dorsad lever.

Preferably, the contact type self-resetting mechanism comprises a cam, a motor for driving the cam and a motor power supply circuit, wherein the motor power supply circuit comprises a power supply, the positive pole of the power supply is connected with the negative pole column of the motor through a wire, the negative pole of the power supply is connected with a hook, and the cam is connected with the positive pole column of the motor through a wire.

Preferably, the cam is a non-standard wheel with a centre of gravity offset to one side.

Preferably, the cam is made of a conductive material, and the cam and the motor output shaft are in an insulation design.

Preferably, the lever is arranged in the middle of the bistable beam.

A self-resetting method of a bistable air switch, comprising the steps of:

s1, when the circuit works normally, the cam is at the initial position of the cam and the hook is at the hook electrifying position because of the gravity center shift of the cam, and the cam and the hook are not contacted with each other;

s2, when the circuit is overheated, overcurrent or undervoltage, the hook rotates to the hook power-off position around the shaft under the action of the bistable lever;

s3, when the hook rotates to the hook power-off position, the hook contacts the cam, and the motor power supply circuit is switched on; the motor is electrified and started to drive the cam to rotate, when the cam rotates from the initial position of the cam to the transition position of the cam, the hook rotates from the power-off position of the hook to the transition position of the hook, at the moment, the bistable beam jumps under the deformation effect, and in the jumping process of the bistable beam, the hook rotates from the transition position of the hook to the power-on position of the hook;

s4, in the process that the hook is rotated from the hook transition position to the hook power-on position, the cam is separated from the hook, and the power supply circuit of the motor is disconnected;

and S5, the power supply circuit of the motor is disconnected, and the cam is finally stabilized at the initial position of the cam under the action of self gravity.

Compared with the prior art, the invention has the beneficial effects that: the invention amplifies the displacement of the lever in the switch through the bistable beam; after the displacement of the bistable lever is amplified, the rotation angle of the hook is increased, so that the self-reset circuit above the hook is switched on, the hook is forced to drive the bistable lever to move through the rotation of the cam under the action of the motor, when the bistable lever moves to the jump displacement of the bistable beam, the jump of the bistable beam drives the hook to be switched on with the lock chain, at the moment, the hook is separated from the cam, and the self-reset circuit is switched off.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

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

Fig. 1 is a schematic structural view of a bistable air switch of the present invention.

Fig. 2 is a schematic structural view of a conventional air switch.

Fig. 3 is a schematic diagram of a bistable beam jump in the present invention.

Fig. 4 is a schematic view of a contact type self-resetting mechanism in the present invention.

Fig. 5 is a schematic diagram of the bistable beam jumping of the bistable air switch of the present invention from reset.

The reference numbers are as follows:

1-spring, 2-main contact, 3-chain, 4-hook, 5-shaft, 6-lever, 7-armature, 8-under voltage release, 9-heating element, 10-bimetallic strip, 11-electromagnetic release, 12-cam gravity center position, 13-cam, 14-bistable beam.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 2, the present invention provides a technical solution: the utility model provides a novel bistable state air switch that possesses from reset function, include the basic air switch that comprises spring 1, main contact 2, the chain 3, the hasp 4, axle 5, lever 6, armature 7, under voltage detacher 8, heating element 9, bimetallic strip 10 and electromagnetism release 11, the fixed bistable roof beam 14 that is provided with on lever 6, lever 6 and bistable roof beam 14 combine to form bistable state lever, bistable roof beam 14 is the elasticity arc strip, the both ends of bistable roof beam 14 and the shell structure rigid coupling in the basic air switch, be equipped with the contact from reset mechanism in the basic air switch, the contact is established in one side that the hasp 4 dorsad lever 6.

Further, the contact type self-resetting mechanism comprises a cam 13, a motor driving the cam 13 and a motor power supply circuit, wherein the motor power supply circuit comprises a power supply, the positive pole of the power supply is connected with the negative pole column of the motor through a wire, the negative pole of the power supply is connected with the hook 4, and the cam 13 is connected with the positive pole column of the motor through a wire.

Further, the cam 13 is a non-standard wheel, and the center of gravity thereof is shifted to one side.

Furthermore, the cam 13 is made of a conductive material, and the cam 13 and the output shaft of the motor are designed in an insulating mode.

Further, the lever 6 is provided in the middle of the bistable beam 14.

The basic air switch is a conventional air switch, and the structural connection relationship thereof is not repeated in the specification, and the structural design drawing thereof refers to fig. 2;

referring to fig. 1 and 3, the trip operation of the bistable air switch of the present invention is as follows:

1. when the circuit is overheated, the bimetallic strip 10 is bent and deformed under the action of the heating element 9, and the bistable lever 14 is pushed to move upwards; when the circuit is undervoltage, the armature 7 on the undervoltage release 8 is opened under the action of the spring 1, and in the opening process, the armature 7 on the undervoltage release 8 pushes the bistable lever 14 to move upwards; when the circuit is over-current, the armature 7 on the electromagnetic release 11 is attracted under the action of the increased electromagnetic force, and in the attraction process, the armature 7 on the electromagnetic release 11 pushes the bistable lever 14 to move upwards.

2. In the case of the above-mentioned overheating, undervoltage or overcurrent situation, the bistable lever is subjected to an upward force, under which the bistable beam 14 undergoes the deformation of fig. 3. When the displacement dx of the force-bearing end of the lever 6 is equal to 0, i.e. the air switch is in the normal operating state, the bistable beam 14 is as shown in state 1 of fig. 3. As the displacement dx of the force-bearing end of the lever 6 increases to dx-d 1, the bistable beam 14 is as shown in state 2 of fig. 3. At this point, the bistable beam 14 jumps, and after jumping, the bistable beam 14 is as shown in state 3 of fig. 3. During the jump, the displacement is changed from dx-d 1 to dx-d, and the amplification of the displacement is realized.

3. After the bistable beam 14 jumps, the bistable lever pushes the hook 4 and the chain 3 to separate, and the 'tripping' function of the bistable switch is realized.

Next, referring to fig. 1, fig. 3, fig. 4 and fig. 5, the self-resetting operation of the bistable air switch of the present invention will be described:

s1, when the circuit is operating normally, the cam 13 is balanced with the cam initial position (i.e., position 6) due to the shift of the center of gravity of the cam 13, and the hook 4 is in the hook energizing position (i.e., position 1).

S2, when the circuit is overheated, overcurrent or undervoltage, the hook 4 rotates around the shaft 5 to the hook power-off position (i.e. position 3) under the action of the bistable lever.

S3, when the hook 4 rotates to the position 3, the motor power supply circuit is turned on because the hook 4 contacts the cam 13, and the bistable beam 14 is as shown in the state 1 of fig. 5. The motor drives the cam 13 to rotate, and when the cam initial position (namely the position 6) rotates to the cam transition position (namely the position 5), the hook 4 rotates to the hook transition position (namely the position 2) from the hook power-off position (namely the position 3). With the hook 4 in position 2, the bistable beam lever has a displacement d1, and the bistable beam 14 is shown in state 2 in fig. 5, in which the bistable beam 14 jumps. During the jump of the bistable beam 14, the hook 4 rotates from position 2 to position 1, the bistable beam 14 being shown in state 3 of fig. 5.

In the process of rotating the hook 4 from the position 2 to the position 1 at S4, the cam 13 is separated from the hook 4, and the self-reset circuit is disconnected.

S5, when the self-reset circuit is disconnected, the cam 13 rotates to the position 4 (the temporary position under the action of inertia force) from the cam transition position (namely the position 5) under the action of self inertia, and as the motor power supply circuit is in the power-off state, the cam 13 is only under the action of gravity, and the cam 13 is finally stabilized at the position 6.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. The utility model provides a novel bistable state air switch that possesses from reset function, includes the basis air switch who comprises spring (1), main contact (2), chain (3), hasp (4), axle (5), lever (6), armature (7), under voltage detacher (8), heating element (9), bimetallic strip (10) and electromagnetism release (11), its characterized in that, fixed bistable beam (14) that is provided with on lever (6), lever (6) and bistable beam (14) combine to form bistable lever, bistable beam (14) are elastic arc strip, the both ends of bistable beam (14) and the shell structure rigid coupling in the basis air switch, be equipped with the contact from reset mechanism in the basis air switch, the contact is established in one side of hasp (4) dorsad lever (6) from reset mechanism.

2. The novel bistable air switch with self-reset function of claim 1, wherein: the contact type self-resetting mechanism comprises a cam (13), a motor driving the cam (13) and a motor power supply circuit, wherein the motor power supply circuit comprises a power supply, the positive pole of the power supply is connected with a negative pole column of the motor through a wire, the negative pole of the power supply is connected with a hasp (4), and the cam (13) is connected with a positive pole column of the motor through a wire.

3. The novel bistable air switch with self-reset function according to claim 2, wherein: the cam (13) is a non-standard wheel, the centre of gravity of which is offset to one side.

4. The novel bistable air switch with self-reset function according to claim 2, wherein: the cam (13) is made of a conductive material, and the cam (13) and the output shaft of the motor are designed in an insulating mode.

5. The novel bistable air switch with self-reset function of claim 1, wherein: the lever (6) is arranged in the middle of the bistable beam (14).

6. A self-resetting method of a bistable air switch as claimed in claim 2, comprising the steps of:

s1, when the circuit works normally, the cam (13) is located at the cam initial position due to the gravity center offset of the cam (13), the hook (4) is located at the hook electrifying position, and the cam (13) and the hook (4) are not contacted with each other at the moment;

s2, when the circuit is overheated, overcurrent or undervoltage, the hook (4) rotates to a hook power-off position around the shaft (5) under the action of the bistable lever;

s3, when the hook (4) rotates to the hook power-off position, the hook (4) contacts with the cam (13), and the motor power supply circuit is switched on; the motor is electrified and started to drive the cam (13) to rotate, when the cam (13) rotates from the cam initial position to the cam transition position, the hook (4) rotates from the hook power-off position to the hook transition position, at the moment, the bistable beam (14) jumps under the deformation effect, and in the jumping process of the bistable beam (14), the hook (4) rotates from the hook transition position to the hook power-on position;

s4, in the process that the hook (4) rotates from the hook transition position to the hook power-on position, the cam (13) is separated from the hook (4), and the power supply circuit of the motor is disconnected;

and S5, the power supply circuit of the motor is disconnected, and the cam (13) is finally stabilized at the initial position of the cam under the action of self gravity.