CN201184429Y

CN201184429Y - A monostable permanent magnet hydraulic valve for a hydraulic spring operating mechanism

Info

Publication number: CN201184429Y
Application number: CNU2008200117299U
Authority: CN
Inventors: 林莘; 田阳; 马跃乾; 徐建源
Original assignee: Shenyang University of Technology
Current assignee: Shenyang University of Technology
Priority date: 2008-03-25
Filing date: 2008-03-25
Publication date: 2009-01-21
Anticipated expiration: 2018-03-25

Abstract

A monostable permanent magnet hydraulic valve for a hydraulic spring operation mechanism, which belongs to the field of high-voltage breaker switch, comprises a valve body including a valve body having a permanent low-pressure oil region, a working oil region, a first permanent high-pressure oil region and a second permanent high-pressure oil region, and a valve core arranged in the valve body. The monostable permanent magnet hydraulic valve is characterized in that a permanent magnet valve is inlaid on the right part of the valve body and is composed of an operation coil, a magnetic yoke ring, a nylon end cover, a moving iron core, a magnetic-conducting ring, a nylon gasket and a magnetic yoke, wherein the moving iron core is arranged in the magnetic yoke body; the operation coil, the magnetic yoke ring, the nylon gasket and the magnetic-conducting ring are sequentially arranged outside the moving iron core; a permanent magnet ring is arranged on the outer surface of the magnetic yoke ring; the nylon end cover is arranged on the end face of the magnetic yoke; both ends of a drive rod on the moving iron core respectively protrude out of the magnetic yoke body and the nylon end cover; and oil path interfaces communicated with each oil regions are arranged on the valve body. The valve has the advantages of simple structure, flexible, safe and reliable operation and long service life.

Description

The monostable permanent magnetism hydraulic valve that a kind of hydraulic pressure spring operating mechanism is used

Technical field

The utility model relates to a kind of with SF ₆Gas is the primary cut-out technology of arc-extinguishing medium, particularly relates to the monostable permanent magnetism hydraulic valve that a kind of hydraulic pressure spring operating mechanism is used.

Background technique

Along with the fast development of State Grid's cause, electric power system also promotes to high voltage, remote, big capacity direction thereupon over past ten years.From the seventies in 20th century, the large electric network consecutive generation major accident of many countries causes long power failure, causes enormous economic loss, until the crisis civil order.It is apparent more outstanding to solve the safety reliability problem.Show that according to ABB AB's investigation statistics the operation mechanism rate of fault accounts for 43% of fault sum.Therefore high-voltage breaker operation mechanism is improved, reduce amount of parts as far as possible, reduce the operation power consumption, improve reliability, extremely urgent.

The circuit breaker maximum operating voltage grade that the current power transmission circuit is used is generally 126～1100kV, adopts with SF more ₆Gas is the primary cut-out of arc-extinguishing medium.Its operation mechanism is that hydrovalve is a vitals in this mechanism in the hydraulic pressure spring operating mechanism.Existing hydrovalve utilizes the break-make control oil channel of three solenoid valves, changes the flow direction of working oil, and then controls spool and move to the left or to the right, finally drives the breaker operator contact by connecting rod and does separating brake or combined floodgate motion.Experience shows that following problem appears in existing hydrovalve easily when work, and one, two solenoid valves are controlled spool respectively and moved to the left or to the right, make operating process and control oil channel complexity.Two, the medium cleanliness is had relatively high expectations, the tripping phenomenon can take place in case occur the impurity solenoid valve in the medium.Three, sealing part is many, safety coefficient is low, leakage of oil easily.It is not normal that four, hydraulic pressure greasy dirt deposition can cause the action of hydrovalve spool, even hydrovalve lost efficacy.

The model utility content

At existing hydrovalve structure deficiency, it is a kind of simple in structure that the utility model provides, and component are few, and mechanical life is long, reliability height, the monostable permanent magnetism hydraulic valve of using with the hydraulic pressure spring operating mechanism of hydraulic spring mechanism perfect cooperation.

Technical though of the present utility model is: one, improve existing hydrovalve structure: three solenoid valves, control oil channel and the spool right-hand member oil pocket that remove existing hydrovalve, and the effective pressure area at adjustment spool two ends, make the situation of permanent magnet hydraulic valve core at identical oil pressure, the resultant pressure that is subjected to the right.Purpose is to promote spool reliably to move right fast under the acting in conjunction of oil pressure and permanent magnetic valve.Two, key design a kind of novel permanent magnetic valve match with hydrovalve.

The utility model is that the technological scheme that its technical problem of solution is adopted is: this valve comprises valve body, divide in the valve body normal low pressure oil district is arranged, the working oil district, the first normal high pressure oil area, the second normal high pressure oil area, and establish within it spool, and the valve body right part is equipped with permanent magnetic valve, and it contains an operating coil, magnet yoke ring, nylon end cap, moving iron core, magnetic guiding loop, nylon ring and yoke.

Wherein: be provided with moving iron core in the yoke body, moving iron-core workpiece in axial direction is provided with operating coil outward successively, magnet yoke ring, nylon washer, magnetic guiding loop, wherein the magnet yoke ring outer surface is provided with permanent-magnetic clamp, the yoke end is provided with the nylon end cap, and the driveshaft two ends on the moving iron core pass respectively outside the external and nylon end cap of yoke, and valve body is provided with the working oil path interface B that is communicated with the working oil district, with the high-pressure oil passage interface C that the first normal high pressure oil area is communicated with, the low pressure oil circuit interface A that is communicated with normal low pressure oil district.

The purpose that the utility model is provided with magnetic guiding loop is when moving iron core is in as the position among Fig. 2 b, feeds less electric current in the operating coil and just can make the iron core action.The purpose that nylon ring (non-magnet material) is set is that when moving iron core was in as the position among Fig. 2 c, permanent magnet can provide enough big suction to moving iron core.The inside of the valve body Packed first normal high pressure oil area, the second normal high pressure oil area, working oil district, normal low pressure oil district and spool, permanent magnetic valve embeds the right part of valve body, the driveshaft of spool and permanent magnetic valve is by being threaded, and it is in aggregates that then the driveshaft of spool, permanent magnetic valve is connected the back with moving iron core.

The utility model beneficial effect compared to existing technology is: need not hydraulic pilot valve (solenoid valve), hydraulic oil produces a kind of power that makes spool produce and move right in advance to spool in the valve, make the breaker open operation quick action, can obtain comparatively desirable opening velocity characteristic; Permanent magnetic valve is controlled spool separately and is moved left, makes breaker closing, and acting characteristic and pressure independent prevent that hydrovalve from dividing slowly and close slowly; The operation power consumption is little, and valve volume is little, and seal point is few, and installation, maintenance, debugging are conveniently.

Description of drawings

Fig. 1 is a permanent magnetism hydraulic valve structural principle schematic representation;

Fig. 2 is a permanent magnetic valve operating process principle schematic;

Wherein, figure a separating brake position view, figure b closing operation schematic representation, figure c closing position schematic representation, figure d sub-switching operation schematic representation.

Among Fig. 1,1 normal low pressure oil district, 2 working oil districts, 3 first normal high pressure oil areas, 4 permanent magnetic valves, 5 high pressure oilholes, 6 spools, 7 second normal high pressure oil areas, 8 valve bodies, A low pressure oil circuit interface, B working oil path interface, C high-pressure oil passage interface.

Among Fig. 2,9 driveshafts, 10 operating coils, 11 permanent-magnetic clamps, 12 nylon end caps, 13 moving iron cores, 14 magnetic guiding loops, 15 nylon rings, 16 yokes, 17 magnet yoke rings.

Embodiment

Below in conjunction with accompanying drawing the utility model is further specified, the monostable permanent magnetism hydraulic valve that a kind of hydraulic pressure spring operating mechanism is used comprises valve body 8 as shown in Figure 1, has normal low pressure oil district 1 in the valve body 8, working oil district 2, first normal high pressure oil area 3, the second normal high pressure oil areas 7, and establish within it spool 6, in valve body 8 right chambeies, be provided with permanent magnetic valve 4, be provided with moving iron core 13 in the permanent magnetic valve 4, the driveshaft 9 on the moving iron core 13 links to each other with spool 6.Valve body is provided with the working oil path interface B that is communicated with the working oil district, the high-pressure oil passage interface C that is communicated with the first normal high pressure oil area, the low pressure oil circuit interface A that is communicated with normal low pressure oil district, when the utility model used on the primary cut-out hydraulic pressure spring operating mechanism, the working oil path on the valve body linked to each other with working oil path interface B on the hydraulic actuating mechanism; High-pressure oil passage interface C links to each other with high-pressure oil passage interface C on the hydraulic actuating mechanism; Low pressure oil circuit interface A links to each other with low pressure oil circuit interface A on the hydraulic actuating mechanism, wherein: be provided with moving iron core 13 in yoke 16 abdominal cavities of permanent magnetic valve 4, the moving 13 external operating coils 10 that in axial direction are provided with successively unshakable in one's determination, magnet yoke ring 17, nylon washer 15, magnetic guiding loop 14, wherein magnet yoke ring 17 outer surfaces are provided with permanent-magnetic clamp 11, yoke 16 ends are provided with nylon end cap 12, and moving iron core 13 has driveshaft 9 two ends to stretch out respectively outside the external and nylon end cap 12 of yoke 16.When spool 6 remains on the right part, and when not having electric current to pass through in the permanent magnetic valve operating coil 10 (as shown in Figure 1), under the identical situation of oil pressure, because the effective pressure area of spool 6 left ends is greater than the effective pressure area of right-hand member, therefore spool 6 is subjected to driving force (resultant pressure) to the right, and only this driving force makes spool 6 and moving iron core 13 remain on the right part.Because the permanent magnetic valve left part is nylon end cap 12 (non-magnet material), the magnetic line of force that permanent-magnetic clamp 11 produces constitutes the closed-loop path shown in I among Fig. 2 a through the low magnetic resistance passage of yoke 16, magnetic guiding loop 14 and moving iron core 13.The suction that then moving iron core 13 is subjected to permanent-magnetic clamp 11 is very little, can ignore and not remember.This moment, working oil district 2 connected with normal low pressure oil district 1, and working oil district 2 keeps low-pressure state.Then the bottom oil pocket of hydraulic pressure spring operating mechanism is full of low pressure oil, and pushing drawing rod is finished sub-switching operation, and contact of breaker remains on the separating brake position.

When giving the permanent magnetism hydraulic valve actuating signal, the operating coil 10 of permanent magnetic valve passes to DC Forward Current, and the magnetic line of force direction that this electric current produces is opposite with the magnetic line of force direction of permanent magnet, sees among Fig. 2 b.It produces magnetomotive force, the low magnetoimpedance passage that utilizes yoke 16 and magnetic guiding loop 14 to provide, the magnetic field that produces in moving iron core 13 is formed by the magnetic field of operating coil generation and the magnetic field superposition of permanent magnet generation, when electric current reaches certain value, generation electromagnetic force left is greater than spool 6 driving force to the right in the moving iron core 13, this moment, moving iron core passed through working gas gap together with driveshaft with certain speed under the effect of making a concerted effort, and drove spool 6 to left movement.Working oil district 2 disconnects with normal low pressure oil district 1 in this process, and with first normal high pressure oil area 3 connections, working oil district 2 becomes high pressure conditions by low-pressure state.And then the drive contact of breaker is moved to closing position by the separating brake position.

When spool 6 moved to the left part, the primary cut-out contact was in closing position.Operating coil 10 current cut-offs of permanent magnetic valve, the magnetic field that permanent-magnetic clamp 11 produces, the low magnetoimpedance passage that utilizes moving iron core 13 and yoke 16 to provide constitutes the closed-loop path.See Fig. 2 c, the suction left that moving iron core 13 is subjected to, and this suction is greater than spool 6 driving force to the right, thus will move iron core 13 and spool 6 remains on the left part, working oil district 2 and first normal high pressure oil area 3 connections this moment.Working oil district 2 remains on high pressure conditions, and then the bottom oil pocket of hydraulic pressure spring operating mechanism is full of high pressure oil, and pushing drawing rod is finished closing operation, and contact of breaker remains on closing position.

When giving the permanent magnetism hydraulic valve actuating signal again, the operating coil 10 of permanent magnetic valve feeds reverse dc, and the magnetic line of force direction that this electric current produces is opposite with the magnetic line of force direction that permanent magnet produces, and sees Fig. 2 d.Magnetic field in the moving iron core 13 is formed by stacking shown in I among Fig. 2 d by magnetic field and the permanent magnet generation magnetic field that operating coil produces, when electric current reaches certain value, generation electromagnetic force left is less than spool 6 driving force to the right in the moving iron core 13, moving iron core, drove spool 6 and moved right under the effect of making a concerted effort together with driveshaft this moment.Working oil district 2 disconnects with normal low pressure oil district 1 in this process, connects with the first normal high pressure oil area 3, and the working oil district becomes high pressure conditions by low-pressure state.And then the drive contact of breaker is moved to the separating brake position by closing position.

Claims

1. A monostable permanent magnet hydraulic valve for a hydraulic spring operating mechanism, including a valve body and a permanent magnet valve. In the high-pressure oil area, there is a valve core in the valve body. Its characteristics are: a permanent magnet valve is installed on the right part of the valve body, and a moving iron core is installed in the permanent magnet valve. The driving rod on the moving iron core is connected with the valve core. There are working oil circuit interface B connected with the working oil zone, high pressure oil circuit interface C connected with the first normal and high pressure oil zone, and low pressure oil circuit interface A connected with the normal and low pressure oil zone.

2. A monostable permanent magnet hydraulic valve for a hydraulic spring operating mechanism according to claim 1, characterized in that the permanent magnet valve includes: an operating coil, a yoke ring, a nylon end cover, a dynamic Iron core, magnetic conducting ring, nylon ring and magnetic yoke, wherein: a moving iron core is arranged in the magnetic yoke body, and an operating coil, a magnetic yoke ring, a nylon washer, and a magnetic conducting ring are arranged in sequence outside the moving iron core along the axial direction, among which The outer surface of the yoke ring is provided with a permanent magnet ring, and the end surface of the yoke is provided with a nylon end cover.