JPS63141231A - Cylindrical cut out switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cylindrical cut-out switch in which a switching contact and a fuse are arranged in series within a cylindrical insulator tube.

[Conventional technology]

A cylindrical cut-out switch has a fuse arranged inside a cylindrical insulator tube, the lower electrode of the fuse can be fixed at the lower end, a terminal fitting is provided for connecting an external electric wire led out to the outside of the insulator tube, and the upper end is equipped with a terminal fitting for connecting an external electric wire led out to the outside of the insulator tube. An external electric wire to be led out is connected, a fixed contact is provided that protrudes downward from the insulator tube, a movable contact that connects and separates from this fixed contact is integrally attached to the upper electrode of the fuse, and a sealing plug is installed at the lower end of the insulator tube. It was fixed.

[Problems to be solved by the present invention]

Therefore, when replacing a fuse, the sealing stopper is removed from the insulator using the operation rod, the lower electrode of the fuse is fitted into the cylindrical fuse tube insertion part at the tip of the operation rod, and the fuse is removed from the insulator. Because the circuit is opened manually, the breaking speed is not constant, and the arcing time between the fixed contact and the movable contact often fluctuates.Especially if the fuse blows out at less than the fuse's minimum breaking current, replacement work is required. However, it is dangerous and difficult to replace, especially when the current carrying capacity becomes large.

[Means for solving problems]

The present invention was made in order to solve the above problems, and a switch is provided above the cylindrical insulator tube, a fuse clip is attached to the end of the movable electrode led out from the switch, and the switch is connected to the wall of the switch. A cutoff spring is installed between the fuse clip and
The upper electrode of the fuse is fitted into the fuse clip, and a locking device for locking the switch in the closing position via the fuse is provided at the lower part of the insulator tube and moves in the direction of attachment and detachment of the fuse on the end face of the lower electrode of the fuse. An actuator is provided so that the actuator can be opened, and this actuator is engaged with a sealing plug that engages with the end of the insulator tube. When the sealing plug is removed from the end of the insulator tube, the actuator is actuated together with the sealing plug that engages with the end of the insulator tube. The locking device that locks the fuse is released, and the switch is opened together with the fuse by the spring force of the cutoff spring.

〔Example〕

The embodiment shown in the figure will be described below.

In the figure, 1 is a cylindrical insulator tube, 2 is a sealed type closure provided on the upper part of the insulator tube, and an identification electrode 3 is fixed to the upper end of the insulator tube, and a fixed contact 3a is pressed against the end of this fixed electrode by a spring 3b. A movable electrode 5 having a movable contact 5a that comes into contact with and separates from the fixed contact is integrally housed in the enclosure 4.

Reference numeral 6 denotes a stopper provided on the movable electrode, which is configured to bulge the wall of the enclosure around the movable electrode inward and lock it in the bulged portion 4a.

Reference numeral 7 denotes an arc extinguishing cylinder made of a conductive material, and an arc running path 7a projecting toward the contact portion of the movable and fixed contacts is provided on the inner periphery of the cylinder, and is connected to the fixed electrode by a conducting wire (not shown).

Reference numeral 8 indicates a permanent magnet (which may be an arc drive coil) provided on the outside of the arc extinguishing tube 7, which is held between the arc extinguisher tube 7 and the intermediate electrode, and is fixed to the flange portion of the fixed electrode. Arc-extinguishing gas such as SF6 gas, 10 is a lead wire whose one end is connected to a fixed electrode, 11 is a fuse clip provided at the end of the movable electrode, formed into a bowl shape from a conductive material, and a locking piece 11a is attached to the end surface of the fuse clip. A protruding contact piece 11b is provided on the periphery to sandwich the upper electrode of the fuse described later.

12 is a cutoff spring mounted between the fuse clip and the end face of the enclosure to bias the movable electrode in the opening direction; 13 is a guide cylinder formed integrally with the enclosure and surrounds the cutoff spring and the fuse clip; 14 is a guide tube formed integrally with the enclosure; With current limiting fuse, fuse tube 1
Electrodes 14b and 14G are provided at both ends of 4a, and a fuse winding frame 15, a fuse element 16,
A fusing indicator line 17, a fusing indicator spring 18, a fusing indicator 19, and arc extinguishing sand 20 are housed.

Reference numeral 21 denotes a holding ring attached to the end of the insulator tube. A holding part 21a is provided in the middle of the inside of the ring, and a round lantern-shaped (◇) insertion hole 21b is provided in this holding part.

21c is a protrusion located above the square hole side of the insertion hole 21b and provided on the inner circumferential surface of the retaining ring.

22 is a support made of a conductive material fixed to the upper surface of the retaining ring;
A current collector 23 is attached to this support and is in pressure contact with the lower electrode 14C of the current limiting fuse.

24 is a locking device, and projecting pieces 25a, 25 are provided on the end face of the current limiting fuse lower electrode 14C and project outward from the outer periphery of the electrode.
In addition to providing an engaging piece 25 having a diameter of 1.a, a pin 26 is fixed across a support 22.22 attached to a retaining ring 21, and a stepped portion 27a is provided in the middle of an engaging element 27 with one end fixed to the pin. , by engaging the protruding piece of the engaging piece 25 to hold the sealed type closure 2 in the closed position against the spring force of the cutoff spring 12.

27b is a guide piece provided on the extension of the engaging element 27, 28 is a pressing spring that presses the engaging element 27 inward, and 29 is a release device, which has a cut groove 30a in the longitudinal direction on the end face of the lower electrode of the current limiting fuse. A guide cylinder 30 is installed therein, and an actuator 31 is provided so as to be able to slide inside the guide cylinder, and the actuator is provided with a trapezoidal actuator piece 31a that protrudes from the cut groove 30a. The lower part of the actuator 31 has an engagement groove 31b.
The outer periphery of a ring-shaped engagement spring 32 whose inner periphery is engaged with the engagement groove 31b is fixed to a sealing plug 33 described later.

Reference numeral 33 denotes a sealing stopper, which is provided with a protrusion 33a in its center that fits into the insertion hole of the retaining ring 21, and whose peripheral edge is fitted into the inner circumferential surface of the retaining ring. 33b is a slip groove, and 34 is a lead wire connected to the support 22 at one end.

Next, the operation will be explained.

(Attachment of current-limiting fuse) First, to explain the case of attaching the current-limiting fuse 14, the guide tube 30 attached to the lower electrode 14c of the current-limiting fuse 14 is attached to the tip of the operating rod (not shown), and the sealing plug 33 is attached to the tip of the operating rod (not shown). It is inserted through the insertion hole 21b of the holding portion 21a of the holding ring 21 attached to the removed cylindrical insulator tube 1. Then,
When the upper electrode 14b of the current-limiting fuse 14 is inserted into the guide tube 13 provided integrally with the enclosure 4 and the current-limiting fuse is further pushed, the upper electrode 14b of the current-limiting fuse 14 is inserted into the end surface of the fuse clip 11 and the enclosure 4. The contact piece 11b of the fuse clip
The end face of the upper electrode 14b is locked with the locking piece 11a of the fuse clip, and the upper electrode 14b of the current limiting fuse is securely fitted into the fuse clip.

Then, when the current limiting fuse 14 is further pushed in against the spring force of the cutoff spring 12, the lower electrode 1 of the current limiting fuse 14
The protruding piece 25a of the engaging piece 25 provided at 4c engages with the protrusion 2IC provided on the retaining ring 21, thereby blocking the current limiting fuse.

In this position, when the current-limiting fuse 14 attached to the operating rod (not shown) is turned 90 degrees, the protruding piece 25a of the engaging piece 25 attached to the lower electrode 14c and the protrusion 25 of the retaining ring
When the current-limiting fuse is disengaged from C, and the current-limiting fuse is further pushed in against the spring force of the cut-off spring, the lower electrode 1 of the current-limiting fuse
Projecting piece 25a of the engaging piece 25 of the locking device 24 provided at 4c
When pressed, the guide piece 2 of the engager 27 resists the spring force of the spring 28.
7b is pushed in while expanding outward, and when the protruding piece 25a of the engaging piece reaches the stepped part 27a of the engaging piece, the pressing spring 2
Due to the spring force of 8, the stepped portion 27a of the engaging element fits into the lower surface of the protruding piece 27a of the engaging piece, and locks the current limiting fuse 14, and the fuse clip engages with the upper electrode 14b of the current limiting fuse. to fix the movable contact 5a to the fixed contact 3a.
Complete the circuit closing operation by contacting and fitting. Then, using an operating rod (not shown), the sealing plug 33 for waterproofing is fitted into the protective ring 21, and all operations for installing the current limiting fuse are completed. FIG. 1 shows the cylindrical cut-out switch in a closed state.

(Load current cutoff) Next, we will explain the case where this cylindrical cutout switch cuts off the load current and performs the disconnection operation.
In the figure, first screw the tip end of the operating rod (not shown) into the threaded part 133b of the sealing stopper 33, and then pull the operating rod downward.

As a result, the sealing plug 33 separates from the lower end of the cylindrical insulator tube l, and the actuator 31 of the release device 29 is pulled down together via the engagement spring 32 attached to the sealing plug.

Then, the actuating piece 31a provided on the actuator 31
pushes the engaging element 27 of the locking device 24 outward, and the stepped part 27a of the engaging element disengages from the protruding piece 25a of the engaging piece 25 attached to the lower electrode 14 of the current limiting fuse 14, causing the limiting element 27 to expand outward. The flow fuse 14 is pushed downward by the spring force of the cutoff spring 12.

Then, the movable electrode 5 is pushed down together with the current-limiting fuse through the fuse clip fitted to the upper electrode 14b of the current-limiting fuse, and the movable contact 5a of the movable electrode is separated from the fixed contact 3a, and this fixed contact child 3a and movable contact 5a
An arc occurs between them.

The arc in the atmosphere of the arc-extinguishing gas 9 is caused by the permanent magnet 8
One leg of the arc moves to the arc extinguishing tube 7 due to the magnetic flux.

Therefore, the arc current is transmitted from the fixed electrode 3 to the lead wire 10.
．． It travels through the arc-extinguishing gas atmosphere through the fixed contact 4 and the arc-extinguishing tube 7, passes through the movable contact 5a, the movable electrode 5, the fuse clip 11, the current-limiting fuse 14, and then the lower electrode 14C of the current-limiting fuse. The electric current flows from the current collector 23 through the support 22 to the electrical path passing through the lead wire 34. On the other hand, arc extinguishing tube 7
The arc in the arc-extinguishing gas atmosphere between the movable contact 5a and the movable contact 5a is rotated and extinguished by a permanent magnet 8 attached to the outer periphery of the arc-extinguishing cylinder. The current limiting fuse 14 is locked by a protruding piece of an engaging piece 25 provided on the lower electric current Fi 14c of the current limiting fuse colliding with the upper surface of the holding portion 21a of the holding ring 2.

(Removal of current-limiting fuse) When the operating rod (not shown) is further pulled down, the sealing plug 33
The actuator 31 and the sealing plug 33, which are connected to each other via the engagement spring 32, are completely separated from the end of the cylindrical insulator tube 1.

Next, when the tip of the operating rod (not shown) is engaged with the guide tube 30 attached to the lower electrode 14C of the current-limiting fuse and the operating rod is turned 90 degrees, the current-limiting fuse 14 rotates at the same time. The protruding piece 25a of the engaging piece 25 attached to the lower electrode 14C of the flow fuse matches the insertion hole 21b provided in the holding part 21a of the holding ring 21, and when the operating rod is pulled down at this position, the lower electrode 14c is attached to the lower electrode 14c. The coupling piece 25 is pulled down together with the operating shaft from the insertion hole 21b of the holding part 21a of the holding ring, the upper electrode 14 of the current limiting fuse 14 is detached from the fuse clip 11, and the current limiting fuse 14 is taken out from the cylindrical insulator tube. .

(Operation when the fusing indicator line is broken) When the fusing indicator line 17 is broken, the fusing indicator 19 is pressed downward by the fusing indicator spring 18, as shown in FIG. 5, and the actuator 31 is struck and moved downward.

Then, as in the case of load current interruption, the actuator 31
The actuating piece 31a provided on the engaging element 27 of the locking device 24
The protruding piece 25 of the engaging piece 25 attached to the lower electrode 14 of the current limiting fuse 4
a is disengaged, and the current limiting fuse 14 is disconnected from the cutoff spring 12.
is pushed down by the spring force. Then, the movable electrode 5 is pushed down together with the current-limiting type fuse through the fuse clip fitted to the upper electrode 14b of the current-limiting fuse, and the movable contact 5a of the movable electrode is separated from the fixed contact 3a, and the fixed contact 5a is separated from the fixed contact 3a. An arc is generated between the contact 3a and the movable contact 5a.

The arc in the atmosphere of the arc-extinguishing gas 9 is caused by the permanent magnet 8
One leg of the arc moves to the arc extinguishing tube 7 due to the magnetic flux.

Therefore, the arc current is transmitted from the fixed electrode 3 to the lead wire 10.
．． It travels through the arc-extinguishing gas atmosphere via the fixed contact 4 and the arc-extinguishing tube 7, passes through the fuse clip 11 from the movable contact 5a + movable electrode 5, passes through the current-limiting fuse 14, and then passes through the lower electrode of the current-limiting fuse. From the current collector 23 to the support 2 from 14c
2 and flows into the electrical path passing through the lead wire 34. On the other hand, the arc in the arc-extinguishing gas atmosphere between the arc-extinguishing cylinder 7 and the movable contactor 53 is extinguished by being rotationally driven by a permanent magnet 8 attached to the outer periphery of the arc-extinguishing cylinder. The current-limiting fuse 14 is locked by a protruding piece of an engaging piece 25 provided on the lower electrode 14c of the current-limiting fuse colliding with the upper surface of the holding portion 21a of the holding member N21.

[Effects of the present invention]

Since the present invention is constructed as described above, when the sealing stopper is removed from the insulator tube, the switch 2 is opened together with the fuse 14 by the spring force of the cutoff spring 12, and the movement of the movable electrode 5 is controlled by the operation of the operating rod. Therefore, the opening/closing operation is constant, and the arc is reliably opened without going outside the insulator. Also, since the movable electrode 5 is locked in the open position, the fuse 14 can be replaced safely.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a part of the embodiment of the present invention;
The figure is an A-A vA sectional view, and Figure 3 is 90' from Figure 1.
A cross-sectional view of the lower part of the cylindrical insulator tube in a shifted position, Figure 4 is a cross-sectional view of the lower part of the cylindrical insulator tube when the sealing plug is removed, and Figure 5 is a cross-sectional view of the lower part of the cylindrical insulator tube showing the state when the melting indicator line is fused. FIG. 1... Cylindrical insulator tube 2... Sealed type closure 3... Fixed electrode 3a... Fixed contact 4... Enclosure container 4a... Swelling part 5... Movable electrode 5a.・・Movable contactor 6・・Stopper 7・・Arc extinguishing tube 7a・・Arc traveling path 8・・Permanent magnet 9・・Arc extinguishing gas 10・・Lead wire 11・・Fuse clip 11a...Locking piece 11b...Contact piece 12...Shutoff spring 1...3...Guide tube ' 14...Current limit fuse 14a...Fuse tube 14b...Upper electrode 14C... ...Lower electrode 15...Fuse winding frame 16...Fuse element 17...Fuse indicator line 18...Fuse indicator spring 19...Fuse indicator 20...Arc-extinguishing sand 21...Holding Ring 21a...Holding part 21b...Insertion hole 21C...Protrusion 22...Support 23...Collector 24...Locking device 25...Engagement piece 25a...Protrusion Piece 26...Bin 27...Engager 27a...Step part 27b...Guide piece 28...Press spring 29...Release device 30...Guide cylinder 3'Oa...Cut Groove 31... Actuator 31a... Actuation piece 31b... Engagement groove 32... Engagement spring 33... Sealing plug 33a... Projection 33b... Thread groove 34... Opening Line L1 Procedural amendment (voluntary) March 9, 1988 Patent Office Commissioner Akio Kuroda 1, Indication of the case Relationship to 1986 Patent Application No. 286665 case Patent applicant 4, Agent 5, Date of amendment order Self (1) "Minimum disconnection of fuses in particular" on page 3, line 1 of the specification is corrected to "minimum disconnection of fuses, especially during replacement work." (2) Page 11, line 18 of the same. ``Upper electrode 14'' has been corrected to ``Upper electrode 14tz''. We have corrected this to ``(Operation when the current-limiting fuse blows out) If an excessive current such as a short-circuit current flows and the element 16 of the current-limiting fuse 14 and the blowout indicator line 17 blow out, the element of the current-limiting fuse may blow out. (4) "Lower electrode 14" in the 9th line of the 12th line of the same document is corrected to "lower electrode 14C." (5) 12th page of the same page, lines 15 to 13 On page 10, line 10, "Fixed contact...extinguishes the arc." will be corrected to "Disconnects from fixed contact 3a and becomes disconnected."

Claims (1)

[Claims] A cylindrical insulator tube with its lower end open, a switch fixed to the top of the insulator tube, a fuse clip attached to the movable electrode of the switch, a cutoff spring that biases the movable electrode in the opening direction, and an upper electrode fitted into the fuse clip. an engaging device provided at the bottom of the insulator tube and having an engaging element that engages with the lower electrode of the fuse so as to hold the switch in a closed position through the fuse; and a sealing plug that fits into the end of the insulator tube. and an actuator provided at the end of the lower electrode of the fuse, the end of which is locked to a sealing plug so that it can move in the direction of attachment and removal of the fuse, and the actuator is pulled down in conjunction with the detachment operation of the sealing plug, The cylindrical type is characterized in that the engagement between the engaging element of the locking device and the lower electrode of the fuse is released by the operation of the actuator, and the switch is opened integrally with the fuse by the spring force of the cutoff spring. cutout switch.