FI106076B - Fuses - Google Patents

Description

! 106076

Fuse disconnector - Säkringslastbrytare

The present invention relates to a fuse-disconnector according to the preamble of claim 1. The fuse-disconnector is preferably shaped as a so-called. fuse strip, and comprises a body having fuse base portions having snap switches for fuse cartridges, a lid to which a number of fuse cartridges can be attached, and a pivoting lever opening for engaging the lid and a pivotable lever arm attached to the housing portion.

A manual fuse disconnector 15 such as the one described above is known from EP-A-0199182. The disadvantage of this known design is that the operating speed in the closed-open position and, at the same time, the closing capability of the switch are dependent on the person who controls the device.

It is an object of the present invention to provide a fuse-switch disconnector comprising a simple and inexpensive in-phase apparatus which achieves an operating speed that is at least partially independent of the user of the device in the closed-open state. This is achieved by a structure according to the character-25 character part of claim 1.

The invention will be explained in more detail in the following exemplary embodiment with reference to the accompanying drawings, in which Fig. 1 is a schematic view of a fuse-off switch 30 in accordance with the invention; Figures 2 and 3 schematically illustrate a switch in closed and open position; details at the beginning of step 35 when the lid moves to the closed position, and Figure 6 schematically illustrates the operation of the torque mechanism when the lid moves to the open position.

2 106076%

The body 10 of the fuse-disconnector shown in Figure 1 is essentially of the parallelepiped type and comprises three above-the-line fuse-parts for knife-fuse cartridges having a rated current of 125-630 am-5 peer. Each fuse base portion has two clamshell switches 13, 14 spaced apart (Fig. 3), of which the first clutch switch 13 is connected to, for example, a busbar in the distribution cabinet and the second clutch switch 14 is connected to the clamp rail 15 (Figure 1). The snap switches 13, 14 form the fixed contact parts of the switch at the respective opening terminals, while the two contact knives 17, 18 in the knife fuse cartridge 16 (Fig. 3) form the movable contact parts of the switch.

15

The switch is provided with a cover 20 which is movable parallel to the body part 10 between the closed position (Fig. 2) and the open position (Fig. 3). The cover is provided with guides 23 which protrude into the guide rail in the body portion 10.

20

Moving the lid 20 to or from the frame member 10 is done by hand with the lever arm 10. The lever arm 10 has at one end a handle 31 and at the other two parallel bearing members 32 which pivot into the body portion. The branch member 25a has a certain amount of flexibility in the transverse direction that is possible. ensures that when pressed against each other during installation, they can be guided in between the side walls 21 of the lid and the side walls 11 of the body. Each branch portion has, at its free end, outwardly facing bearing pins 33, 30 which extend into bearing housings 12 on the side walls 11 of the body. The body portion 10, the cover 20 and the lever arm 30 are made of electrically insulating material.

•

The lid 20 and the lever arm 30 are movably connected 35 to each other such that the sidewalls 21 of the lid 20 each have a conveyor, i.e. an inwardly directed cylindrical pin 22 which protrudes into an elongated groove 40 on the outwardly facing side of the lever arm. As the switch 3 106076 moves from the fastener shown in Fig. 2 to the open position shown in Fig. 3, the lid conveyor 22 protrudes from the first end position 22 'shown in dashed line in Fig. 4 to the second extreme position 22 ".

Each of the knife fuse cartridges 16 (Fig. 3) is attached to the mounting basket Vista by a substantially flat-shaped central portion (not shown in the figures). These central portions can in turn be attached to the cover 20 and disengaged therefrom by means of a slider (not shown in the figures) mounted on the cover, movable in the longitudinal direction between the closing position and the neutral position. The slider is generally held by a compression spring (not shown in the figures) toward the locking position 15 and can be pushed into the neutral position against the action of the compression spring by the upwardly pushing knob 24 (Fig. 1). Said central parts also serve as contact protectors and are preferably made of a transparent material, for example polycarbonate 20.

When the switch is in the closed position (as in Fig. 2), the arm end of the lever arm 30 is also secured to the lid 20 by an angled lever arm whose arm member 34 25 (Fig. 1) forms a closing flap resilient to the recess in the lid end. By pressing in the other arm portion below the handle, the closure is released and the lid can be moved to the open position.

If the cover slider 20 is pushed into its idle position by the actuation button 24 (Fig. 1), the cover 20 can be removed from the body 10 by means of the lever 30, provided that the knife fuse cartridges 16 with the aforementioned central contact guards are still attached to the body. By pinching together the arm portions 32 of the lever arm 30 so that the bearing pins 33 are displaced, the cover and the lever arms may be completely detached from the body portion 10 and possibly 4 106076 used in some other fuse-switch disconnector operating as above.

The groove 40 located on the outer surface of each arm portion 5 of the lever arm 30 has a leaf spring 50. The groove 40 and the spring 50 are shaped such that the spring acts on the cover conveyor 22 during the lid opening operation. During this time, the operating speed and power are to a certain extent independent of the user (the so-called partially independent user). Further, the spring 50 is shaped such that it is able to hold the lid 20 in the open position (Fig. 3).

The spring 50 may be made of a rectangular spring steel having dimensions of, for example, 1x7 mm. The diameter may vary greatly depending on the size of the breaker and the material of the spring.

As shown in Fig. 4, the spring 50 comprises an elongated straight central portion 51 having a first end member 52 bent at one end and having the same shape in shape. The second end has a bend 53 which in turn extends to the second, shorter support member 54. 22 is such that a spring more than half its circumference surrounds the conveyor when the switch is in the open position. In the present embodiment, the center of bending angle is about 270 °, which results in its inlet opening being smaller than the diameter of the conveyor 22.

The spring 50 is thus able to hold the lid in the open position.

The groove 40 comprises pockets 41 and 42 for spring support members 52 and 42, respectively.

54. The space between the central spring portion 51 and the nearest groove wall and the groove pocket 41 have spaces 44 and 44, respectively. 45 for movement of spring 35.

The groove pocket 42 for the shorter support member 54 comprises an inclined surface 43 relative to the longitudinal axis of the groove 40.

5 106076

In the initial phase of moving the lid to the closed position (Fig. 5), the spring support member 54 moves along this oblique surface 43, thereby reducing dimension A and strengthening the spring grip around the conveyor 22, thereafter suddenly engulfing the guide member 54 and partially the center of the spring. 51 bend. The force of the lever arm 30 necessary to release the cover conveyor 22 from the grip of the spring 50 (through the opening A) thus becomes relatively high. The resulting closing threshold results in a relatively large amount of operating energy being charged to the operator before the actual transition to the closed position begins. When the spring 50 then releases its grip on the conveyor 22, a rapid release of energy occurs. Most of the travel of the conveyor thus acts as a stopping distance when the cover 20 reaches a relatively high speed of movement in the contact closure, which increases the breakage capacity of the switch. In addition, the cut-off threshold achieves a more secure lid locking in the open position and reduces the risk of accidental locking of the switch.

20 As the cover moves to the open position, the clamping resistor of the fuse base socket switches 13, 14 tightens the leaf spring 50 (dimension B increases). When the contact portions open (the release resistor ceases), the energy stored in the spring 50 is rapidly discharged (dimension B drops to zero) and causes the lid 20 to move rapidly towards 25 open positions (so-called quick break). This increases the deck. movement speed during power cut-off, which at the same time increases the breaker capacity. The dashed line 25 in Fig. 6 shows the movement path of the cover conveyor 22 as well as the lever arm 30 as the cover moves into the open position.

30

The invention is not limited to the exemplary embodiment shown in the figures, but may be implemented in several ways within the scope of the claims. The invention can advantageously be used, for example, in safety disc-type disconnectors with D-type fuses.

Claims (6)

6 106076 1. Säkringslastbrytare innefattande en stomme (10) som in-nehäller et antal kökringsunderdelar med klykkontakter (13, 14) för kökringspatroner, that lock (20) vid flashes ant antet särringsunderdelar weight antal särringspatroner 20 (16) and fixerbara, samt en Locket headset Och i stommen vridbart lagrad feathers (30) for maneuvering av Locket (20) I have to fill in and out of the locket (20), I have to use med minst en medbringare (22), I am skjuter in i ett i liharmen ( 30) utformat avlängt spär 25 (40), i flash en bladfjäder (50) anordnad, colors späret (40) och fjädern (50) no utformade att lockets medbringare (22), vid säväl tillslag som fränslag, päverkas av fjädern pä sparkle setting att manuell Energi upplagras och i det frost *; momentant utlöses under respektive maneuver, och att fjädern • - 30 (50) dessutom är anordnad att halla kvar Locket (20) i fränläget. A fuse-disconnector comprising a housing (10) having self-supplying switches (13, 14) having fuse parts for fuse cartridges, a cover (20) to which a plurality of fuse cartridges (16) can be attached, and a housing and body. for moving the lid (20) of the pivoting lever (30) secured to the member to the closed and open position, characterized in that the lid (20) comprises at least one conveyor (22) projecting into an elongated groove (40) on the lever arm (30); having a leaf spring (50) such that the groove (40) and spring (50) are shaped such that the spring acts on the cover conveyor (22) when the cover is moved to the closed or open position so that manual energy is stored and immediately released during and that the spring (50) further serves to hold the lid (20) in the open position. 2. Säkringslastbrytare enligt patent krav l, a n d e x p e r t e r t e d e d e d e d e d e d e d e d e d i d e d i d e d i d e d. längsträckt mittparti (51), som anordnat att underinitialkedet av et fränslag span in the Grund av klykkontaktna (13, 14) utdragningsmotstand, colors den pd sd satt genom böjning i fjddem (50) lagrade i contact ningsögonblicket. β 106076 Fuse-disconnector according to Claim 1, characterized in that the leaf spring (50) comprises an elongated central portion (51) which is tensioned at the beginning of the lid open position by the clamping resistor of the clutch switches (13, 14). relieving. 25th Fuse isolator according to Claim 1, characterized in that at one end of the leaf spring (50) there is a bend (53) for opening and holding the lid conveyor (22), wherein the width (A) at the mouth 30 is smaller than the diameter of the conveyor (22). . Fuse-disconnector according to Claim 3, characterized in that said spring bending (53) is at one end a support member (54) whose free end at the beginning of the phase when the lid moves into the open position moves along the elongated groove (30). 40) an inclined surface (43) with respect to the longitudinal axis, whereby the grip of the spring 106076 on the jet 22 is further strengthened to suddenly stop due to the deflection of the spring support member (54) and the central portion (51). 3. Sakringslastbrytare enligt patentkrav 2, entry-5 tecknad av att bladfjadern (50) vid en av sina dndar utformad med en rundning (53) för upptagning och kvarhal-lande av lockets medbringare (22) i öppet ldge, colors bred-den (A) hos rundningens ingangsöppning dr mindre an medbrin-garens (22) tvardimension. 4. Sacringslastbrytare enligt patent krav 3, entry tnknad av att fjaderns namnda rundning (53), vergerg i et andparti i form av tand (54), varia fria dnde under första delen av et tilllag rör sig ldngs en i förhdllande till det avn. (40) langsaxel sned yta (43) i hav-15 armen (30), varvid fjaderns grepp runt medbringaren (22) ytterligare förstdrks för att ddrefter plötsligt upphöra genome utböjning av fjdderns stödben (54) och mittparti (51). 5. Sacringslastbrytare enligt ndgot av föregdende patentkrav, kannetecknad av att hdvarmen (30) dr 20 utformad med tvd i am interested in parallel skdnklar (32) med sddan fjädringsförmdga i transversell led, att skanklarna kan infra mellan sidovdggar (L) ) och stom-men (10), colors shade skdnkel pd sin utdtvdnda sida uppvisar en av ndmnda spär (40) och fjäder (50) bildad mechanism. Fuse-disconnector according to one of the preceding claims, characterized in that the lever arm (30) 5 comprises two substantially parallel branch members (32) having a spring capacity such that they can project between the side walls of the cover (20) and the frame member (10). wherein the outwardly facing side of each leg portion shows the mechanism 10 formed by said groove (40) and spring (50). Fuse-disconnector according to any one of the preceding claims, characterized in that the body (10) is of the substantially parallelepiped type and that the body comprises three in-line fuse members. 15 Patent Claims 6. Sacringslastbrytare enligt ndgot av föregdende patent krav, kannetecknad av att stommen (10) I am interested in a parallel recorder and an innehdller tre i en rad; anordnade sdkringsunderdelar.