JPS58152338A - Current limiting fuse - 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] This invention can be attached to, for example, a currently used cylindrical cup 1~au 1~switch, and the rated current capacity can be adjusted.
, etc. Regarding current limiting fuses (ha).

In a conventional cylindrical cassette switch, a small diameter hole is formed at the top of the cylindrical insulator from one end thereof, and a small diameter hole is formed at the bottom of the same small diameter hole at the bottom. On the other hand, the enlarged diameter part that continues through the stepped part or Jl''; 1, 12
An upper fixed electrode is provided at the upper end of the small diameter hole. In addition, an upper fixed electrode was installed at the f-section fixed electrode, which was fitted into the enlarged diameter part so as to be inserted into the stepped part. The insulating tube of the current limiting fuse is fitted through the arc-extinguishing tube, and the upper electrode attached to the J end of this fP edge tube is electrically connected to the +3it mark 7 section fixed electrode, and also to the F section. A lower electrode was attached and electrically connected to the lower fixed mold and pole.

The inner diameter of the small diameter hole in the insulator (4 cutouts) and the out switch cannot be made too large.
'stomach. Moreover, the length is also the same. The outer diameter of the first insulating cylinder inserted into this small diameter hole is also limited by the arc extinguishing cylinder, so it has a large diameter of 4 to 7, and its length is also limited. . Generally, if you want to increase the rated current capacity of the current limiting hose, use the fuse element 71 inside the insulating tube.
I am thinking about increasing the diameter of the wire or increasing the number of wires.

However, if the wire diameter of the fuse element is increased, the amount of melted products generated when the fuse is shut off also increases.
adheres to the inner wall of the insulating cylinder, causing thermal deterioration of the insulating cylinder. Therefore, the dielectric strength between the lower electrodes becomes insufficient. However,
The outer diameter of the insulating cylinder is limited by the arc-extinguishing cylinder on the outside, so it cannot be made too thick. In addition, increasing the number of fuse elements reduces the winding pitch, so
When cut-off occurs, one piece of melting material comes into contact with another object.
C becomes impossible to shut off. For the reasons mentioned above, there is a limit to increasing the rated current capacity using conventional methods.

The object of the present invention is to construct a 3J insulating cylinder that can effectively utilize the enlarged diameter part of a conventional insulator body, consisting of a small diameter part that is inserted into a small diameter hole and a large diameter part that is inserted into an enlarged diameter part. By inserting an insulating core around which the fuse element 1~ is wound in the large diameter part to ensure the length of the fuse element to 1 minute, a current-limiting fuse that can increase the rated current capacity is created. 3) to provide.

Hereinafter, embodiments of the present invention will be described.

First, the outline of the cylindrical cutout switch body will be explained based on the first drawing number ζ. 1 is a small diameter hole 2 extending from the upper end to the lower part.
It is a cylindrical insulator body in which an enlarged diameter part 4 is formed continuously with the lower end of the small diameter hole 2 via a stepped part 3 at the lower part thereof. A molded cone 5 is inserted into an opening at one end of the insulator body 1, and a lead wire 6 is partially embedded inside the molded cone. Reference numeral 7 denotes an upper fixed electrode electrically connected to the inner end of the upper lead wire 6, and 8 an arc extinguishing rod suspended from the inner end via a sublinok 9.

Reference numeral 10 denotes a fixed electrode frame which is fitted into the enlarged diameter part 4 so as to be engaged with the stepped part 3 of the insulator body 1, and an electrode support plate 11 is fixed to the upper end thereof. It is set-C. Note that this electrode support plate 11 has a lower fixed electrode 11)i
is fixed. Reference numeral 12 denotes a molded cone inserted into the lower side of the insulator body 1, and a lower lead wire 13 buried inside the molded cone is electrically connected to the electrode support plate 11.

Reference numeral 14 denotes an arc extinguishing cylinder inserted into the small diameter hole 2 of the insulator body 1, the lower end of which is supported by the stopper 15 of the lower fixed electrode 10F, and the two ends of which are supported by the lower part of the extinguishing rod 8. An O'dore C is installed to surround the outer periphery and extend directly below the -L part fixed electrode 7.
3 and 16 are the enlarged diameter portions 4 (Ill')'F end open'' of the insulator body 1.
The 1st part is attached to the kokema part side, 17 is attached to this kakema member 16, and hung with silk 18. , [) 11 is attached to the rotary hook member 16 (, 1) by sealing the end opening I-1 with a sealing stopper 17 and attaching a metal fitting 19 such as a Q-I fitting 71+ to the hook member 16.

Next, the present invention 1(1) and the current limiting valve will be explained based on FIGS.
1 and a large-diameter portion 22 of a portion of the door 1';
3 is the open end of this small diameter part 21 [J)-) is the upper electrode inserted in the 21 part, and the contact 24 is fixed to the upper part. 6, 25 is the small diameter part 2N/) 'l;l; Lower electrode attached to the outer circumference of the circle, 26 is the F contraction 1 of the large diameter portion 22
The middle electrode 251ζ is inserted into the front part 81 and the electrode 251ζ is electrically connected to the front part 251 by the conductive part 27 fixed to the outer periphery of the large diameter part 22. lc oh, 11iT
'Insulating cylinder 20 and each electrode 23 except RiI contact 24
, 25, 26 and the conductive portion 27 are collectively referred to as a -C fuse link.

28 is a first insulating core inserted into the large diameter part 22 of the insulating cylinder 20 from its lower end to the lower end C (wadding 1);
An internal electrode 29 is fixed to its upper end.
] A cylindrical body 30 of an operation display mechanism fixed to the mountain electrode 261- is inserted into the part. 31 is this cylinder 30
1') K is inserted into the display rod, and is projected downward through the mountain electrode 26 by the biasing force of the spring 32.
Electrically connect and measure the inside of the small diameter portion 21 between the first partial electrode 23 and the internal electrode 29.
A second fuse element 34 is wound around the outer periphery of the insulating core 28 in the large diameter portion 22 as shown in FIG. Electrode 26
There is an electrical connection L/- (there is an electrical connection between the second fuse and Part 34) L or intervening odd C color. 35 is i↑(inside the insulating core 2B;...(
7 is a resistance wire that electrically connects between the internal electrode 29 and the intermediate electrode 26 via the cylinder 30 of the operation display mechanism, and the - end of the resistance wire is connected to the 1, and the display bar 31 is turned so that it is always immersed against the first force of the sprinter 32.
Part o pole 23-first fuse element 33→internal N pole sz+→second fuse element 34-・intermediate electrode 26
The first fuse element is connected in the order of - conductive part 27 - -> lower electrode 25 , and the internal electrode 29 - - resistance wire 35 -> cylindrical body 30 -) intermediate electrode 26 is connected in this order, and the second fuse element 34 is connected in this order.
On the other hand, the resistance wire 35 is connected in parallel.

Note that the insulating cylinder 20 is sealed by the upper electrode 23 and the intermediate electrode 26, and the inside thereof is filled with an arc extinguishing agent 36.

The current limiting fuse F configured as described above is inserted into the insulator body 1 from the hook member 16 as shown in FIG.
1. The contact M1+ terminal 24 at the end thereof is held between the L part fixed electrode 7 and the arc extinguishing rod 8, and the lower electrode 25 is held between the T part fixed electrode 11+1 of the electrode support plate 11. Also, the small diameter portion 21 of the insulating tube 20 is inserted into the arc extinguishing tube 14, and the large diameter portion 22 of the insulating tube 20 is inserted into the insulator body 1.
The lower end is inserted into the fitting recess 17) I of the sealing stopper 17.

Now, when the excessive current flows, Niremen I・33°34
Then, the resistance wire 35 also melts instantly due to the voltage Cζ applied to both ends thereof. When the resistance wire 35 is fused, the display rod 31 of the operation display mechanism is pushed out by the bias of the spring 32, and the fusion is displayed. The metal part 34) of ~34 is reliably fused and a fused indication is similarly displayed.

In addition, in the above-mentioned embodiment, the internal electrode 29 is removed,
The first fuse element 33 and the second fuse element 1/men 1-34 may be connected to form one element.

Di I - The present invention described in detail includes a small diameter portion 21 that is inserted into the small diameter hole 2 of the insulator body 1 and a large diameter portion that is inserted into the enlarged diameter portion 4 of the insulator body 1. 2 constitutes an insulating cylinder 20 17, a small diameter portion 21
The fuse element 33, which is partially attached to one end of the electrode 23, is inserted into the small diameter part 21; The intermediate electrode 26 is wrapped around the lower end of the large diameter portion 22 and electrically connected to the −F portion electrode 25 on the outer periphery of the small diameter portion 21. Therefore, the outer diameter of the insulating core 2B is electrically connected to the inside of the large diameter part 22 of the first insulating cylinder 20 which is inserted into the enlarged diameter part 4 of the insulator body 1. Since it is possible to increase the diameter of the first wire 34 wound around the outer circumference of the insulation core 28, it is possible to increase the diameter of the first wire 34 wound around the circumference of the insulation core 28. Accordingly, the total length of the hair slick can be shortened. Also, since the inner diameter of the large diameter portion 22 of the insulating tube 20 is large, it is possible to use a fuse element with a thick wire diameter. Miniaturization of flow rate and cylindrical cup 1~
The out switch can be made smaller. This effect can be achieved because the insulating cylinder 20 is composed of a small diameter part 21 and a large diameter part 22 so that the enlarged diameter part 4 of the conventional insulator body 1 can be effectively used.

Also, Hughes Element!・Approximately 75% of the total length is the large diameter part 22
Considering the temperature distribution of the current-limiting fuse when current is applied, it is possible to keep the temperature rise low by setting the amount of heat generated in the small diameter section 21 of the insulating tube 20 to 30% of the total. This has the effect of eliminating thermal effects on the resin of the arc extinguishing cylinder 14 and the like on the outside of the insulating cylinder 21. In this case, the large diameter part 22 of the insulating cylinder 20 is smaller than the small diameter part 21.
- (Since the temperature is always high, if the metal part 34 +t is interposed between the second fuse elements 1 to 34 on the outer periphery of the insulating core 28, the temperature of the small diameter part 21 will be low when the temperature rise is low) 1 to ensure melting.

J], the small diameter part 21 and the large diameter part 22 of the insulating cylinder 20 are separated by P
! + Large diameter part 22) When a small current is cut off, the large diameter part 22
You can replace it and remove it, and the small diameter part 21 can be used.
Furthermore, in a current limiting fuse with a small rated current capacity, it is also possible to use only the large diameter portion 22 and make the small diameter portion 21 a mere conductor.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing a cylindrical cut-out switch equipped with a current-limiting fuse according to the present invention, and Fig. 2 is a cross-sectional view showing the current-limiting fuse according to the present invention. Hole 2, enlarged diameter part 4, insulating tube 2o, small diameter part 2
1. Large diameter part 22, upper electrode 23, lower electrode 25, mountain electrode? 6. Conductive part 27, insulating core 28, internal electrode 29, display rod 31, first fuse elements 1 to 33, second fuse elements 1 to 34, metal part 34/l, resistance wire 35, arc extinguisher 36゜Patent applicant Representative of Takamatsu Electric Manufacturing Co., Ltd. Patent Attorney On 1) Hironobu 12 Figure 24 3. 33'・, - 1°, prisoner, 348 1'3゜η ゛1-lK11■＼``--

Claims (1)

[Scope of Claims] 1. An insulating cylinder (20) is provided with a distance of 4C from a small diameter part (21) and a large diameter part (22), and at the upper end of the small diameter part (21).
Attach the two-part electrode (23) and the same small diameter part (21)
A lower electrode (25) is attached to the outer periphery of the lower part, and an insulating core (28) is inserted into the large diameter part (22), and an intermediate electrode (25) is attached to the upper end of the large diameter part (22). 26) and electrically connected to the -L Toden mc 23), the fuse element (33, 34) is passed through the small diameter part (21), and further from the upper end of the insulating core (2B) to its outer periphery. The lower electrode (25) is wrapped around the intermediate electrode (26) and electrically connected to the intermediate electrode (26).
22) A current-limiting fuse characterized by being electrically connected to -C via a conductive portion (27) along the outer periphery of the fuse. 2 Fuse elements 1~ are insulating cores (28) o),
1. An internal electrode (29) fixed to one end and a part electrode (
? 3) Inside the small diameter part (21) of the insulating tube (20) in the old room
The first hikosu niremen l-(3
3), and the inner electrode (29) and intermediate electrode (26) are wrapped around the outer circumference of the insulating plate (2B) in the large diameter part (22).
The second fuse element (3
4) The current limiting fuse as described in item 1 above, and the range of the characteristic Ff Rk. 3. Inside the insulating core (2B), an electrical connection is made between the internal electrode (29) and the intermediate electrode (26). For the fuse element (34), parallel m continuation/:
Insert the resistance wire (35) so that the insulation core (28)
The lower end of the resistance wire (35) is connected to the display rod (31) of the operation display mechanism provided at the lower end of the display rod (31).
1) The current-limiting fuse according to claim 2, wherein the current-limiting fuse is configured to be inserted into the operation display mechanism.