JP3213051B2 - Manufacturing method of alloy type temperature fuse - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the production of an alloy type temperature fuse .
It relates to concrete how.

[0002]

2. Description of the Related Art In a temperature fuse, an electric device to be protected is attached to a portion of the electric device which is likely to generate heat. Thus, when the electric device generates heat due to an overcurrent, the generated heat is received, and the electric device is interrupted by melting the heat-sensitive element, thereby preventing abnormal heat generation of the device.

As such a temperature fuse, an alloy-type temperature fuse using a low melting point fusible alloy piece as a heat-sensitive element is generally used. There are various types of alloy type temperature fuses. Usually, a low melting point fusible alloy piece is bridged between the ends of a lead wire by welding, and the bridged low melting point fusible is formed. Flux is applied to the molten alloy piece.

[0004] The operating process of the alloy type temperature fuse is such that the low melting point fusible alloy piece is melted by the heat generated by the equipment, the molten metal is formed into a sphere by surface tension, and the molten metal is divided by the progress of the spheroidization. The purpose of this cut is to cut off the current. In this case, the flux applied to the low-melting-point fusible alloy piece reacts with the oxide on the surface of the low-melting-point fusible alloy piece, solubilizes the oxide and promotes the spheroidization of the molten metal.

[0005]

SUMMARY OF THE INVENTION
In the case of manufacturing a wire, when the low melting point fusible alloy piece and the lead wire are welded, the lead wire portion of the welding portion is heated to a temperature higher than the melting point of the low melting point fusible alloy piece for a predetermined time (reed). (For a very short time to melt only the low-melting-point fusible alloy portion of the interface between the contact between the wire and the low-melting-point fusible alloy piece) and heating to form an appropriate diffusion layer or intermetallic compound layer. This is effective for securing a predetermined welding strength. Therefore, it is necessary to use a flux that exhibits activity even at this high temperature. On the other hand, when the alloy-type temperature fuse is activated, a material that exhibits activity even at the melting point of the low-melting-point fusible alloy is used in order to quickly perform the spheroidization of the molten low-melting-point fusible alloy. Must.

In the conventional alloy-type temperature fuse, the same base flux as the flux applied to the above-mentioned welding flux and the low-melting-point fusible alloy piece is used as a solvent such as alcohol. And the fluidization temperature is lowered by mixing with paraffin or the like, and the same activator is added.

However, at the lead wire end heating temperature during welding, the high melting point of the low melting point fusible alloy piece is substantially constant while the low melting point fusible alloy is substantially constant even if the low melting point fusible alloy is different. The lower the operating set temperature of the alloy, the lower the temperature, and a low melting point fusible alloy piece having a low melting point of about 60 ° C. may be used.

However, it is difficult to select an activator exhibiting excellent activity over a wide temperature range from the low temperature to the high temperature, and it is difficult to select an activator having a low melting point between the fusible alloy piece and the lead wire. It is very difficult to satisfy both the welding strength and the rapidity of cutting of the molten metal at the time of operating the temperature fuse.

An object of the present invention is to remove a low melting point fusible alloy piece.
An alloy-type temperature hue for bridging the ends of the wire by welding and applying flux to the bridged low melting point fusible alloy piece.
In addition, even if the operating temperature is low, the welding strength between the low melting point fusible alloy piece and the lead wire and the rapidity of the molten metal during the operation of the temperature fuse are all excellent. An object of the present invention is to provide an alloy type temperature fuse.

[0010]

According to the present invention, there is provided a method of manufacturing an alloy type temperature fuse, comprising the steps of: connecting a low melting point fusible alloy piece to a lead wire;
Connected by welding between the tips, this low melting point fusible alloy piece
In the thermal fuse to which flux is applied,
Apply flux and low melting point fusible alloy piece
Both rosin and rosin with additives are added to the flux.
And a flux to which a different activator is added is used .

[0011]

The flux used at the time of welding the lead wire and the low melting point fusible alloy piece is added with an activator exhibiting excellent activity at the heating temperature at the end of the lead wire at the time of welding.
Its welding strength can be well guaranteed.

On the other hand, by adding an activator exhibiting excellent activity at the melting point of the low-melting-point fusible alloy piece to the flux applied to the low-melting-point fusible alloy piece, the flux during the temperature fuse operation is increased. Spheroidal cutting of metal can be performed quickly, and temperature hue
Can ensure quick operation of the device.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numerals 1 and 1 denote a pair of lead wires, and copper wires are used. Reference numeral 2 denotes a low melting point fusible alloy piece whose melting point is set to the operating temperature of the temperature fuse.
Bridges are formed by welding between the front end portions. In this welding, a liquid flux is applied to the leading end of each lead wire 1 and a low melting point fusible alloy piece 2 is mounted between the leading ends of the lead wires 1 so that the lead wire 1 and the low melting point The intersection with the fusible alloy piece 2 is welded. In this case, the lead wire temperature at the weld is
Depending on the type of low melting point fusible alloy piece,
It reaches 0-500 ° C. Thus, an activator exhibiting excellent activity even at such a high temperature is added to the flux used at the time of this welding.

Reference numeral 3 denotes a flux applied to the low melting point fusible alloy piece 2, to which an activator exhibiting excellent activity even near the melting point of the low melting point fusible alloy is added. Reference numeral 4 denotes an insulating resin layer coated on the flux-coated low melting point fusible alloy piece by dip coating. Instead of this insulating coating, a flux-coated low melting point fusible alloy piece is housed in a flat insulating case, and the space between the case opening and the lead wire is sealed with an adhesive such as epoxy resin. You may. Alloy mold according to the present invention
In the method of manufacturing a temperature fuse, a low melting point fusible alloy piece is
For welding using the flux described below between the tips of
To the low melting point fusible alloy piece,
Apply flux with different activator.

For each of the above-mentioned fluxes, rosin obtained by adding an activator and, if necessary, an auxiliary agent is used. Examples of the activator include organic acids, organic chlorides, organic bromides and organic fluorides (for example, organic fluorides). , Abietic acid, palmitic acid, stearic acid, aniline hydrochloride, hydrazine hydrochloride, cyclohexylamine hydrobromide, diethylamine hydrobromide, 2.
3) dibromopropionic acid, etc., and the flux activator used during the welding is selected from those exhibiting excellent activity at the high temperature of 400 to 500 ° C. and coated on the low melting point fusible alloy piece. The activator of the flux is selected from those exhibiting excellent activity even near the melting point of the low melting point fusible alloy.

In the above, the flux used at the time of welding is used in a liquid state at normal temperature, and is diluted with a solvent, for example, isopropyl alcohol, for example,
5 to 15% by weight of rosin, 0.3 to 0.5% by weight of stearic acid or palmitic acid, 0.3 to 0.5% by weight of cyclohexylamine hydrochloride or bromide, 0.1 to 0.1% of 2.3 dibromopropionic acid 0.5% by weight, with the remainder being isopropyl alcohol.

[0017]

The production of the alloy type temperature fuse according to the present invention.
According to the method, the flux used for welding the low melting point fusible alloy piece and the lead wire and the flux applied to the low melting point fusible alloy piece are applied to the lead wire end heating temperature and the low melting point during welding, respectively. An appropriate activator according to the melting temperature of the fusible alloy piece can be added, and the low melting point fusible alloy piece and the lead wire can be strongly welded by forming an appropriate alloy layer or intermetallic compound layer. In addition, at the time of operating the temperature fuse, the spheroidization of the molten metal can be rapidly performed to ensure quick operation of the temperature fuse. Also, when welding low melting point fusible alloy pieces and lead wires
To flux and low melting point fusible alloy pieces
Use rosin as the base for the flux
Since they share the same flux, it is easy to prepare and store the flux.
It can be done easily.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Lead wire 2 Low melting point fusible alloy piece 3 Flux

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-274968 (JP, A) JP-A-3-205727 (JP, A) JP-A-4-224080 (JP, A) JP-A-3-224 57123 (JP, A) JP-A-3-254033 (JP, A) JP-A-3-254034 (JP, A) JP-A-4-56028 (JP, A) JP-A-1-176620 (JP, A) JP-A-59-16238 (JP, A) JP-A-3-57122 (JP, A) JP-A-59-112449 (JP, U) JP-A-3-28635 (JP, U) JP-A 52-72838 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H01H 37/76 H01H 69/02 H01H 85/00-85/62

Claims (1)

(57) [Claims] 1. A low-melting-point fusible alloy piece is placed between the tips of lead wires.
Weld by welding and apply flux to this low melting point fusible alloy piece.
Temperature fuse to be used for the above welding.
Flux and flux applied to low melting point fusible alloy pieces
In addition, both based on rosin or rosin with additive,
Uses flux containing different activators
Manufacturing method of thermal fuse.