Monostable permanent magnet type rapid breaking high-voltage vacuum circuit breaker

Abstract

A monostable permanent magnet type rapid breaking high-voltage vacuum circuit breaker comprises a permanent magnet operating mechanism, an insulating pull rod unit and an arc extinguish chamber unit, the permanent magnet operating mechanism unit comprises a first support installed on a fixed supporting plate, an outer magnet yoke is installed on the first support, a coil, a static iron core and a permanent magnet are installed in the outer magnet yoke, a movable iron core is inserted in the coil and the outer magnet yoke, and the permanent magnet is installed in the static iron core. The movable iron core is connected with a movable iron core pressing block, an opening spring is installed between the movable iron core pressing block and the first support, the insulating pull rod unit comprises an insulating pull rod, the lower end of the movable iron core penetrates through the outer magnet yoke to be connected with the insulating pull rod, an insert is arranged at the lower end of the insulating pull rod, an insulating pull rod spring is installed in the insert, and the overtravel s of the circuit breaker is 2-2.5 mm and meets the conditions that s = 1 / 2 * at2, and a = f / m; a is acceleration; t is time; f is the pressure borne by the opening and insulating pull rod spring; m is the mass of all moving objects driven when the movable iron core moves, and the lower end of the insulating pull rod is connected with the arc extinguish chamber unit. The utility model has the advantages of simple structure, stable and reliable use, no hidden danger of demagnetization, and opening time less than or equal to 5ms.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrical equipment technical field especially a kind of monostable permanent-magnetic type quick-break high-voltage vacuum circuit breaker. BACKGROUND

[0002] Vacuum circuit breaker is power switch equipment, whose arc-extinguishing medium and the insulation medium between arc-extinguishing contact gap are high vacuum, with the advantages of small size, light weight, suitable for frequent operation, arc-extinguishing without maintenance, and is widely used in distribution network. It can be used for protection and control of electrical equipment in industrial and mining enterprises, power plants and substations, especially suitable for use in oil-free, less maintenance and frequent operation places, as control and protection of high-voltage electrical equipment.

[0003] The application scenarios of quick-break permanent-magnetic circuit breaker mainly include medium-voltage overhead line power grid, which is used for switching on and off load current, overload current and short-circuit current. The circuit breakers on the market generally require a breaking time of ≤5ms, and the technical solutions generally use magnetic control switch, and the opening and closing process is completed by magnetizing iron core and magnetic yoke and other components. At the same time, the breaking time is shortened by increasing the contact pressure of arc-extinguishing chamber of circuit breaker and the force value of opening spring. However, there are some problems: first, the soft magnetic material technology is used, and the permeability of soft magnetic material is very high, but it is easy to be magnetized by external magnetic field and affected by external magnetic field, which may cause demagnetization and make the switch lose reliability. Second, the effect of shortening the breaking time by increasing the contact pressure of arc-extinguishing chamber of circuit breaker and the force value of opening spring is limited, and it is difficult to meet the requirement of breaking time of ≤5ms on the market.

[0004] Therefore, how to design a monostable permanent-magnetic type quick-break high-voltage vacuum circuit breaker to solve the above technical problems is the research subject of the utility model. CONTENT OF THE UTILITY MODEL

[0005] The utility model aims to provide a monostable permanent-magnetic type quick-break high-voltage vacuum circuit breaker, which has simple structure design, stable and reliable use, no demagnetization risk and breaking time of ≤5ms.

[0006] In order to achieve the above object, the technical scheme of the utility model is as follows: a single stable permanent magnet type quick breaking high voltage vacuum circuit breaker, wherein the single stable permanent magnet type quick breaking high voltage vacuum circuit breaker comprises a permanent magnet operating mechanism, an insulating pull rod unit and an arc extinguishing chamber unit, the permanent magnet operating mechanism unit comprises a first support plate installed on a fixed support plate, an outer magnetic yoke is installed on the first support plate, a coil, a static iron core and a permanent magnet are installed in the outer magnetic yoke, a dynamic iron core is slidably inserted into the inner cavity of the outer magnetic yoke and connected with the coil, a dynamic iron core pressing block is connected with the dynamic iron core, a tripping spring is installed between the dynamic iron core pressing block and the bottom of the first support plate, the insulating pull rod unit comprises an insulating pull rod, the lower end of the dynamic iron core is connected with the upper end of the insulating pull rod after penetrating through the outer magnetic yoke, an insert is arranged at the lower end of the insulating pull rod, an insulating pull rod spring is installed in the inner cavity of the insert, the overstroke s of the circuit breaker is 2-2.5mm, and the overstroke s satisfies the formula: s = 1 / 2 * at 2 , a = f / m; wherein a is acceleration, t is time, f is the pressure borne by the tripping spring and the insulating pull rod spring, and m is the mass of all moving objects driven by the dynamic iron core when the dynamic iron core moves, the lower end of the insulating pull rod is connected with the arc extinguishing chamber unit.

[0007] The utility model discloses a single stable permanent magnet type quick breaking high voltage vacuum circuit breaker, wherein the outer magnetic yoke, the dynamic iron core, the static iron core and the dynamic iron core pressing block are all made of magnetic conductive material,

[0008] The utility model discloses a single stable permanent magnet type quick breaking high voltage vacuum circuit breaker, wherein the magnetic conductive material adopts electrical pure iron.

[0009] The utility model discloses a single stable permanent magnet type quick breaking high voltage vacuum circuit breaker, wherein the arc extinguishing chamber unit comprises an arc extinguishing chamber and the dynamic contact and the static contact arranged in the inner cavity of the arc extinguishing chamber, the dynamic contact and the static contact are arranged in an up-down interval, the upper end of the dynamic contact is connected with the insulating pull rod through a connecting piece after penetrating through the arc extinguishing chamber.

[0010] The utility model discloses a single stable permanent magnet type quick breaking high voltage vacuum circuit breaker, wherein the connecting piece adopts a bolt.

[0011] The utility model discloses a single stable permanent magnet type quick breaking high voltage vacuum circuit breaker, wherein the lower end of the arc extinguishing chamber and the static contact are all fixed on the second support plate, and the second support plate is fixed on the lower end of the fixed support plate.

[0012] The utility model discloses a single stable permanent magnet type quick breaking high voltage vacuum circuit breaker, wherein the permanent magnet is arranged between the inner wall of the outer magnetic yoke and the outer wall of the static iron core.

[0013] The utility model discloses a single stable permanent magnet type quick breaking high voltage vacuum circuit breaker, wherein the coil is arranged between the inner wall of the outer magnetic yoke and the dynamic iron core pressing block.

[0014] The utility model discloses a single stable permanent magnet type quick breaking high voltage vacuum circuit breaker, wherein the initial pressure of the opening spring and the insulating pull rod spring is 1900N and 800N respectively.

[0015] After the above scheme, the utility model discloses a single stable permanent magnet type quick breaking high voltage vacuum circuit breaker through permanent magnet operating mechanism, and the outer magnetic yoke, dynamic iron core, dynamic iron core pressing block and static iron core are all made of high-quality magnetic conductive material, which is stable and reliable in use, has no degaussing hidden danger, adopts permanent magnet technology, and has high coercive force, high saturation magnetization intensity and good temperature stability. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is the front view structure schematic diagram of a single stable permanent magnet type quick breaking high voltage vacuum circuit breaker embodiment of the utility model;

[0017] Fig. 2 It is the left view structure schematic diagram of a single stable permanent magnet type quick breaking high voltage vacuum circuit breaker embodiment of the utility model;

[0018] Fig. 3 It is the overhead structure schematic diagram of a single stable permanent magnet type quick breaking high voltage vacuum circuit breaker embodiment of the utility model.

[0019] Numbering explanation:

[0020] 1-fixed support plate 2-permanent magnet operating mechanism

[0021] 3-insulating pull rod unit 4-arc extinguishing chamber unit

[0022] 5-first support 6-outer magnetic yoke

[0023] 7-coil 8-static iron core

[0024] 9-permanent magnet 10-dynamic iron core

[0025] 11-dynamic iron core pressing block 12-annular boss

[0026] 13-opening spring 14-insulating pull rod

[0027] 15-moving contact 16-insert

[0028] 17-Bottom Cover 18-Bolts

[0029] 19-Insulating tie rod spring 20-Arc extinguishing chamber

[0030] 21-Stationary contact 22-Second support Detailed Implementation

[0031] The present invention will now be described with reference to the embodiments shown in the accompanying drawings. The embodiments disclosed herein are illustrative in all respects and are not intended to be limiting. The scope of the present invention is not limited by the following description of the embodiments, but only by the scope of the claims, and includes all modifications having the same meaning as and within the scope of the claims.

[0032] The structure of a monostable permanent magnet type fast-disconnecting high-voltage vacuum circuit breaker according to this invention is described below with reference to specific embodiments.

[0033] like Figs. 1 to 3 The diagram shows a front sectional view, left view, and top view of an embodiment of a monostable permanent magnet type fast-breaking high-voltage vacuum circuit breaker of this utility model. It includes at least one set of permanent magnet operating mechanisms 2, insulating pull rod units 3, and arc-extinguishing chamber units 4 mounted on a fixed support plate 1. In this embodiment, three sets of permanent magnet operating mechanisms 2, insulating pull rod units 3, and arc-extinguishing chamber units 4 are configured. Each set of permanent magnet operating mechanisms 2, insulating pull rod units 3, and arc-extinguishing chamber units 4 is connected from top to bottom.

[0034] The permanent magnet operating mechanism 2 includes a first support 5 mounted on a fixed support plate 1. The first support 5 includes two horizontal support plates spaced apart at different heights. The two horizontal support plates are respectively fixed to the fixed support plate 1 by bolts. An annular outer magnetic yoke 6 is mounted on the first support 5. The two horizontal support plates clamp the upper and lower ends of the outer magnetic yoke 6. A coil 7, a stationary iron core 8, and a permanent magnet 9 are installed in the inner cavity of the outer magnetic yoke 6. The coil is located in the middle of the inner cavity wall of the outer magnetic yoke 6, the stationary iron core 8 is located in the lower part of the inner cavity of the outer magnetic yoke 6, and the permanent magnet 9 is located between the inner cavity wall of the outer magnetic yoke 6 and the outer wall of the stationary iron core 8.

[0035] The inner cavity of the coil 7 and the inner cavity of the outer magnetic yoke 6 are inserted with a moving iron core 10, which can slide up and down along the inner cavity of the coil 7 and the inner cavity of the outer magnetic yoke 6. The upper part of the moving iron core 10 is connected with a moving iron core pressing block 11, the outer edge of the moving iron core pressing block 11 is close to the upper wall of the inner cavity of the outer magnetic yoke 6. A ring-shaped boss 12 is arranged in the middle of the inner cavity of the outer magnetic yoke 6, the moving iron core pressing block 11 is located above the ring-shaped boss 12, the coil 7 is arranged below the ring-shaped boss 12, and the coil 7 is located between the inner wall of the outer magnetic yoke 6 and the moving iron core pressing block 11. The outer magnetic yoke 6, the moving iron core 10, the moving iron core pressing block 11 and the static iron core 8 are all made of excellent magnetic conductive material, and in this embodiment, electrical pure iron is preferably used as the material of the above components. The moving iron core pressing block 11 is installed between the lower horizontal support plate of the first support 5 and the opening spring 13, and the moving iron core pressing block 11 can slide downward with the moving iron core 10, so as to compress the opening spring 13.

[0036] The insulation pull rod unit 3 includes an insulation pull rod 14, the lower end of the moving iron core 10 is connected with the upper end of the insulation pull rod 14 after passing through the outer magnetic yoke 6, and the lower end of the insulation pull rod 14 is connected with the moving contact 15 of the arc extinguishing chamber unit 4. The lower end of the insulation pull rod 14 is provided with an insert 16, the inner cavity of the insert 16 is assembled with an insulation pull rod spring 19, a bolt 18 and a bottom cover 17, the bottom cover 17 and the insert 16 are engaged together through threads, and the lower end of the insulation pull rod spring 19 abuts against the bottom cover 17.

[0037] The overstroke s of the circuit breaker is 2-2.5mm, and the stroke s satisfies the formula: s=1 / 2*at 2 , a=f / m; wherein a is acceleration, t is time, f is the pressure borne by the spring, and m is the mass of all moving objects driven by the moving iron core 10 when moving. When s is reduced, t is also reduced.

[0038] The arc extinguishing chamber unit 4 includes an arc extinguishing chamber 20, a moving contact 15 and a static contact 21 arranged in the inner cavity of the arc extinguishing chamber 20, the moving contact 15 and the static contact 21 are arranged in an up-down interval, the upper end of the moving contact 15 is connected with the bottom cover 17 through the bolt 18 after passing through the upper end of the arc extinguishing chamber 20. The lower end of the arc extinguishing chamber 20 and the static contact 21 are fixed on the second support 22 through bolts, and the second support 22 is fixed on the lower end of the fixed support plate 1.

[0039] When the circuit breaker of the utility model is closed, the coil 7 of the permanent magnetic operating mechanism 2 is electrified, the moving iron core 10 and the moving iron core pressing block 11 drive the insulation pull rod unit 3 to move downwards under the electromagnetic force, compress the opening spring 13, and continue to compress the insulation pull rod spring 19 to complete the closing after driving the moving contact 15 and the static contact 21 of the arc extinguishing chamber unit 4 to close, at this time, the magnetic force generated by the permanent magnet 9 keeps the moving iron core 10 and the moving iron core pressing block 11 at the closing position; when the circuit breaker of the utility model is opened, the coil 7 of the permanent magnetic operating mechanism 2 is electrified in the opposite direction, the moving iron core 10 and the moving iron core pressing block 11 overcome the magnetic force under the electromagnetic force, and move upwards under the joint action of the opening spring 13 and the insulation pull rod spring 19 to complete the opening.

[0040] The opening time is the time from the opening coil receiving the signal to the moving contact 15 and the static contact 21 of the arc extinguishing chamber unit 4 being completely separated, the main factors affecting the opening time in the utility model include the insulation pull rod spring 19, the opening spring 13, the coil 7, the power voltage, the outer magnetic yoke 6, the moving iron core 10, the moving iron core pressing block 11 and the static iron core 8, the outer magnetic yoke 6, the moving iron core 10, the moving iron core pressing block 11 and the static iron core 8 are all made of high-quality magnetic conductive material, which is stable and reliable in use, has no demagnetization hidden danger, improves the opening speed and reduces the opening time; in use, the initial pressure of the insulation pull rod spring 19 and the opening spring 13 is increased, the pressure f between the moving contact 15 and the static contact 21 is increased, the acceleration a can be increased, and thus the time opening time t can be reduced; the initial pressure of the insulation pull rod spring 19 and the opening spring 13 is respectively designed as 1900N and 800N in the utility model.

[0041] The utility model discloses a single stable permanent magnetic type quick breaking high voltage vacuum circuit breaker, through the comprehensive design, through the initial pressure of the insulation pull rod spring 19 and the opening spring 13, the reasonable coil wire diameter and ampere turns number such as adopting the wire diameter 0.3 ampere turns number 980 electromagnetic coil, the outer magnetic yoke 6, the moving iron core 10, the moving iron core pressing block 11 and the static iron core 8 all adopt the pure iron of electrician, the reasonable setting operation pulse length and controller power voltage such as operation pulse length 100ms, controller power voltage 380V, the circuit breaker body opening time is controlled in 5ms, realizes the quick opening.

[0042] The above-described embodiments are merely preferred embodiments of the present application, and are not intended to limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those of ordinary skill in the art shall fall within the protection scope of the present application as defined by the claims.

Claims

1. A monostable permanent-magnetic type fast-breaking high-voltage vacuum circuit breaker, characterized by, The circuit breaker comprises a permanent magnet operating mechanism, an insulation pull rod unit and an arc extinguishing chamber unit. The permanent magnet operating mechanism unit comprises a first support installed on a fixed support plate. An outer magnetic yoke is installed on the first support. A coil, a static iron core and a permanent magnet are installed in the outer magnetic yoke. A dynamic iron core is slidably inserted into the inner cavity of the outer magnetic yoke. A dynamic iron core pressing block is connected to the dynamic iron core. A disconnecting spring is installed between the dynamic iron core pressing block and the bottom of the first support. The insulation pull rod unit comprises an insulation pull rod. The lower end of the dynamic iron core is connected to the upper end of the insulation pull rod after passing through the outer magnetic yoke. An insert is arranged at the lower end of the insulation pull rod. An insulation pull rod spring is installed in the inner cavity of the insert. The overstroke s of the circuit breaker is 2-2.5 mm. The overstroke s satisfies the formula: s=1 / 2*at 2 , a=f / m; wherein a is acceleration; t is time; f is the pressure received by the disconnecting spring and the insulation pull rod spring; and m is the mass of all moving objects driven by the dynamic iron core when moving. The lower end of the insulation pull rod is connected to the arc extinguishing chamber unit.

2. A monostable permanent-magnetic type high voltage vacuum circuit breaker with fast breaking according to claim 1, characterized in that, The outer magnetic yoke, the moving iron core, the static iron core and the moving iron core pressing block are made of magnetic conductive material.

3. A monostable permanent-magnetic type high voltage vacuum circuit breaker with fast breaking according to claim 2, characterized in that, The magnetic conductive material is made of pure electrical iron.

4. A monostable permanent-magnetic type high voltage vacuum circuit breaker with fast breaking according to claim 1, characterized in that, The arc extinguishing chamber unit comprises an arc extinguishing chamber, a moving contact and a static contact arranged in the inner cavity of the arc extinguishing chamber, the moving contact and the static contact are arranged in an upper and lower interval, the upper end of the moving contact is connected with the insulating pull rod through a connecting piece after passing through the arc extinguishing chamber.

5. A monostable permanent-magnetic type high voltage vacuum circuit breaker with fast breaking according to claim 4, characterized in that, The connecting piece is a bolt.

6. A monostable permanent-magnetic type high voltage vacuum circuit breaker with fast breaking according to claim 4, characterized in that, The arc extinguishing chamber and the lower end of the static contact are fixed on a second support, and the second support is fixed on the lower end of the fixed support plate.

7. A monostable permanent-magnetic type high voltage vacuum circuit breaker with fast breaking according to claim 1, characterized in that, The permanent magnet is arranged between the inner wall of the outer magnetic yoke and the outer wall of the static iron core.

8. A monostable permanent-magnetic type high voltage vacuum circuit breaker with fast breaking according to claim 1, characterized in that, The coil is arranged between the inner wall of the outer magnetic yoke and the moving iron core pressing block.

9. A monostable permanent-magnetic type high voltage vacuum circuit breaker with fast breaking according to claim 1, characterized in that, The initial pressure of the opening spring and the insulating pull rod spring is 1900N and 800N respectively.

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