CN2413379Y - High-voltage drop-off fuse - Google Patents

Abstract

The utility model discloses a high voltage falling fuse. The pressure between a static contact sheet and a contact head is provided by two thrust plate spring sheets, and favorable electric apparatus contact performance can be ensured. Two springs which are axially and symmetrically wound are used and are provided with an elastic card of an ellipse-shaped hole, which tightens a fuse component tail line. When the non fuse-link is fused, the utility model can keep the elastic card always hooking with a mobile joint to cause the positions of the mobile joint and the moving contact head to be fixed. The utility model can not result in loading fuse falling because of the fuse-link heating or stress extension, and can ensure the line safe operation.

Description

High voltage drop-out type fuse cutout

The utility model relates to the device for fusing of using in the outdoor supply line of electric power system.

At present, the high voltage drop-out type fuse cutout that uses in the power system power supply circuit, mainly comprise insulator, be fixed on the insulator, static contact on the following contact base, the molten device that carries that includes fuse member reaches, lower moving contact, turning joint and snap the line card, during fuse work, the moving contact that keeps carrying molten device upper end by the tensioning fuse member is electrically connected with static contact, this fuse is because device is irrelevant mutually at the turning joint and the snap the line card that carry molten device lower end, the structural shortcoming of this external cause, last moving contact and static contact contact point are easily loose, therefore, when the fuse member temperature distortion is extended or be subjected to operating physical force to impact elongation, the turning joint meeting is descending, all can cause the contact position change to make the electrical equipment loose contact, when serious, also can cause a year molten device to fall voluntarily, influence the circuit reliability of operation, and the contact stability in contact is relatively poor, and striking scaling loss contact-making surface also easily takes place.

The purpose of this utility model is to provide a kind of high voltage drop-out type fuse cutout safe and reliable to operation for supply line.

The high voltage drop-out type fuse cutout that the utility model provides, comprise insulator, the upper contact head seat, last static contact, following contact base, following static contact, carry molten device by what the built-in fuse member of arc-extinguishing tube constituted, be fixed with moving contact in the upper end of carrying molten device, the lower end is fixed with turning joint, turning joint and lower moving contact are movably connected with fulcrum, lower moving contact is movably connected with fulcrum with following contact base, be used to push down the snap the line Cali usefulness spring assembly of fuse member buttock line at lower moving contact, it is characterized in that said go up static contact with the contact be the boundary before, back two parts in obtuse angle, its two ends are fastening with two thrust plate reeds that are fixed on the upper contact head seat respectively, latter half is horizontal by the supporting twisted plate that is fixed on the upper contact head seat and is against its below, lower moving contact has pin-and-hole and a pair of outer wall that stretches out, the cylindric axle sleeve that corresponds to each other and be separated by, turning joint has the support arm of connecting rod and band crotch, the snap the line card is provided with hook and the Long Circle hole of usefulness is installed, the connecting rod of turning joint and the pin-and-hole of lower moving contact are connected to moving fulcrum with pivot pin, the pair of cylinders shape axle sleeve of lower moving contact places down in the groove of relative two plates of contact base, with it serves as to support to change the formation moving fulcrum, a central shaft passes through the Long Circle hole of the spring and the snap the line card of two axial symmetrical coilings, its two end is inserted in the cylindric axle sleeve of lower moving contact, two springs respectively have an end bearing on lower moving contact, the other end is bearing on the snap the line card, and the crotch on the hook of snap the line card and the turning joint support arm is hook mutually.

High voltage drop-out type fuse cutout of the present utility model, because of adopting two thrust plate reeds that pressure between static contact and the contact is provided, so can guarantee good electrical equipment contact performance, during work, utilize the spring of two axial symmetrical coilings to control snap the line card tensioning fuse member buttock line with Long Circle hole, when non-fuse member is fused, can keep snap the line card and turning joint hook mutually all the time, thereby make turning joint and moving contact fixed-site, can be around connecting the pivot pin rotation, therefore be heated or all can not cause a year molten device to fall during applied elongation when fuse member, can ensure the circuit reliability service.

Below in conjunction with accompanying drawing the utility model is described in detail.

Fig. 1 is the outline drawing of high voltage drop-out type fuse cutout;

Fig. 2 is vertical partial sectional view of high voltage drop-out type fuse cutout;

Fig. 3 is the A-A cutaway view of Fig. 2;

Fig. 4 is the lower moving contact schematic diagram, and wherein scheming a is longitudinal sectional view, and figure b is the B-B cutaway view of figure a;

Fig. 5 is a snap the line card schematic diagram, and wherein scheming a is front view, and figure b is a vertical view;

Fig. 6 is an operational forces transmission schematic diagram.

With reference to Fig. 1, Fig. 2, Fig. 3, high voltage drop-out type fuse cutout of the present utility model, comprise insulator 24, be fixed on the insulator, under upper contact head seat 15, following contact base 14, carry molten device 3 by what the built-in fuse member 2 of arc-extinguishing tube constituted, be fixed with moving contact 1 in the upper end of carrying molten device, the lower end is fixed with turning joint 4, on upper contact head seat 15, be fixed with supporting twisted plate 20, two thrust plate reeds 17,18 and last static contact 16, wherein go up static contact 16 with female contact 16 ' be boundary form in obtuse angle before, back two parts, the two ends of last static contact 16 respectively with two thrust plate reeds 17,18 is fastening, and latter half is horizontal by supporting twisted plate 20 and is against its below, compression thrust plate reed 17,18 energy storages, like this, when closing a floodgate, last moving contact 1 enters in static contact 16 grooves as long as very little stroke just can obtain enough contact pressures, vibration elastic amplitude in the time of also can reducing to close a floodgate is simultaneously avoided striking.Usually, make the middle part of two thrust plate reed active forces, contact 16 on the static contact ' be positioned at, it is parallel to each other that two thrust plate reeds are drawn the position from the root of upper contact head seat, like this, when meeting big electric current, electrodynamic adhesive compensation will make on the contact lifts, and can increase the contact pressure between contact, the phenomenon that will generate heat when improving between contact by big electric current.In the schematic structure, be fixed with flexure strip 19 with last moving contact 1 sliding contact last static contact 16 latter half of, it can constrain in the normal contact-making surface going up moving contact 1, simultaneously, make and carry molten device in the drop-out current process, move downwards along slide when upper contact head falls, play time-lag action, year molten device is just come off after fuse member melts, can avoid the electrical arc erosion contact.Turning joint 4 have connecting rod 5 and the band crotch 6 ' support arm 6, lower moving contact 10 (see figure 4)s have outside pin-and-hole 11 and a pair of stretching wall, the cylindric axle sleeve 12 that corresponds to each other and be separated by, snap the line card 7 (see figure 5)s are provided with hook 26 and the Long Circle hole 27 of usefulness are installed, the connecting rod 5 of turning joint links to each other with the pin-and-hole of lower moving contact 10 11 usefulness pivot pins 13 and forms moving fulcrum, the pair of cylinders shape axle sleeve 12 of lower moving contact 10 places down in the groove of contact base 14 relative two plates, with it serves as to support to change the formation moving fulcrum, a central shaft 8 passes through the Long Circle hole 27 of the spring 9 and the snap the line card 7 of two axial symmetrical coilings, two ends are inserted in the cylindric axle sleeve 12 of lower moving contact 10, frame is between lower moving contact two walls, two springs 9 respectively have an end bearing (y point of Fig. 3) on lower moving contact 10, other has an end bearing (x point of Fig. 3) on snap the line card 7, the hook of crotch 6 on the hook 26 of snap the line card and the turning joint support arm ' mutually, the snap the line card of the buttock line 23 of fuse member 2 lower ends by pressing down, be fastened on the lower moving contact 10 with securing member 29, lower moving contact 10 contacts with following static contact 22, usually, for make have between lower moving contact and following static contact bigger contact pressure with for separating the elastic thrust that provides certain, can make lower moving contact have flange, and static contact is contacted with flange.

During operate as normal, the tensile force that the snap the line card presses down the fuse member buttock line makes turning joint 4 and lower moving contact 10 fixed-site, can be around pivot pin 13 rotations, closing operation carries when melting device, only the groove of the cylindric axle sleeve 12 following contact bases 14 of lower moving contact is the fulcrum rotation, from Fig. 4 as seen, when depressing the snap the line card, because an end of spring 9 is the x points that are bearing in snap the line card 7, the other end is bearing in the y point of lower moving contact 10, then the elastic force of spring certainly will promote the snap the line card, make the right-hand m and central shaft 8 supportings in snap the line card Long Circle hole, guarantee snap the line card hook 26 and turning joint support arm crotch 6 ' hook does not come off mutually, and effectively fixed connecting between turning joint 4 and the lower moving contact 10, can not take place to contact because of the electrical equipment that fuse member is heated or applied elongation influences between contact.This fuse has only after fuse member is fused, the buttock line pulling force all loses, snap the line is stuck under the gyroscopic action power of spring 9, when becoming the left n in Long Circle hole and central shaft 8 supportings, the snap the line card just breaks off relations with turning joint, fixed position between turning joint 4 simultaneously and the lower moving contact 10 is released, and turning joint is descending around pivot pin 13 rotations, at once, carry molten device and under the elastic thrust of tenesmus active force of conducting oneself with dignity and following static contact 22, fall split circuit rapidly.Usually, protruding guide pad 28 (being illustrated in Fig. 3) to 10 liang of walls of lower moving contact is set on relative two plates of lower moving contact seat 14, and make the two sides 29 of guide pad be slope, like this, when closing operation, lower moving contact 10 inevitable slope along guide pad in the process of rotation advances and runs to the middle part of contact base 14 down, makes the last moving contact that carries molten device also can aim at the upper static contact position.In the diagram concrete structure, the upper end of carrying molten device be provided be used for on the device that is electrically connected with fuse member 2 of moving contact 1, this device comprises pressure releasing cap 30, button sheet 32, pressure releasing cap has center column and is E shape longitudinal section, the height of its center column is lower than the height of outside circle ring column, and roof thickness is less than the annulus wall thickness, has with last moving contact at the inwall of circle ring column and twists the screw thread that connects, button sheet 32 is tightened with screw thread, by newel it is against the end face of moving contact and fuse member.Last moving contact and fuse member adopt such arrangements of electric connection, are fused meeting molten part, and when arcing increased the arc-extinguishing tube internal gas pressure, the active force of air pressure can break through pressure releasing cap top thin-walled and exhaust can be played the safeguard protection effect by newel.

Claims (6)

1. high voltage drop-out type fuse cutout, comprise insulator [24], upper contact head seat [15], last static contact [16], following contact base [14], following static contact [22], year molten device [3] by the built-in fuse member of arc-extinguishing tube [2] formation, be fixed with moving contact [1] in the upper end of carrying molten device, the lower end is fixed with turning joint [4], turning joint and lower moving contact [10] are movably connected with fulcrum, lower moving contact [10] is movably connected with fulcrum with following contact base [14], the snap the line card [7] that is used to push down fuse member buttock line [23] utilizes spring [9] device in lower moving contact [10], it is characterized in that said go up static contact [16] with contact [16 '] be the boundary before, back two parts in obtuse angle, its two ends respectively with the two thrust plate reeds [17] that are fixed on the upper contact head seat [15], [18] fastening, latter half is horizontal by the supporting twisted plate [20] that is fixed on the upper contact head seat and is against its below, lower moving contact has pin-and-hole [11] and a pair of outer wall that stretches out, the cylindric axle sleeve [12] that corresponds to each other and be separated by, turning joint has the support arm [6] of connecting rod [5] and band crotch, snap the line card [7] is provided with hook [26] and the Long Circle hole [27] of usefulness is installed, the connecting rod of turning joint [5] is connected to moving fulcrum with the pin-and-hole [11] of lower moving contact [10] with pivot pin [13], the pair of cylinders shape axle sleeve [12] of lower moving contact places down in the groove of relative two plates of contact base [14], with it serves as to support to change the formation moving fulcrum, a central shaft [8] passes through the Long Circle hole [27] of the spring [9] and the snap the line card [7] of two axial symmetrical coilings, its two end is inserted in the cylindric axle sleeve [12] of lower moving contact [10], two springs [9] respectively have an end bearing on lower moving contact [10], the other end is bearing on the snap the line card [7], and the crotch on the hook of snap the line card [26] and the turning joint support arm [6] is hook mutually.

2. by the said high voltage drop-out type fuse cutout of claim 1, it is characterized in that the contact [16 '] on the static contact is positioned at the middle part of two thrust plate reeds [17], [18] active force, it is parallel to each other that two thrust plate reeds [17], [18] are drawn the position from the root of upper contact head seat [15].

3. by the said high voltage drop-out type fuse cutout of claim 1, it is characterized in that being fixed with and the flexure strip [19] of last moving contact [1] sliding contact last static contact latter half of.

4. by the said high voltage drop-out type fuse cutout of claim 1, it is characterized in that on relative two plates of following contact base [14] protruding guide pad to lower moving contact [10] two walls [28] being set, the two sides of guide pad [29] are slope.

5. by the said high voltage drop-out type fuse cutout of claim 1, it is characterized in that the upper end of carrying molten device be provided be used for on the device that is electrically connected with fuse member [2] of moving contact [1], this device comprises pressure releasing cap [30], button sheet [32], pressure releasing cap has center column and is E shape longitudinal section, the height of its center column is lower than the height of outside circle ring column, roof thickness is less than the annulus wall thickness, inwall at circle ring column has and the stubborn screw thread that connects of last moving contact, button sheet [32] is tightened with screw thread, by newel it is against the end face of moving contact and fuse member.

6. by the described high voltage drop-out type fuse cutout of claim 1, it is characterized in that lower moving contact has flange, flange contacts with following static contact.

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