JPH06269929A - Method for connecting nichrome of surface heater - Google Patents

Abstract

PURPOSE:To easily and surely connect nichrome wires and lead wires of a surface heater by using a connecting terminal. CONSTITUTION:The surface heater having the nichrome wires formed by pattern wirings and the lead wires for supplying currents to these nichrome wires is constituted by holding the nichrome wires 7 to a connecting terminal 1 consisting of a bent clad material which has an aperture 6 on its front surface and consists of a non-molten metal 2 on the outer side and a molten metal 3 on the inner side and by irradiating the aperture 6 with a light beam 9 to braze the nichrome wires 7 and the connecting terminal 1, then joining the connecting terminals 1 and the lead wires.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nichrome wire connecting method for a sheet heater. For more details,
The present invention relates to a method for simply and reliably connecting a nichrome wire of a planar heater useful for a floor heating system and a wall heating system of a house or the like to a lead wire for supplying current.

[0002]

2. Description of the Related Art Conventionally, for example, a panel heater that constitutes a floor heating system or a wall heating system of a house, etc.
An electric heating type sheet heater is used. In this planar heater, for example, as shown in FIG. 6, a nichrome wire (a) is patterned on a substrate, both ends of this nichrome wire (a) are connected to a lead wire (a), and a lead wire (a) is formed. ), A current is supplied to the nichrome wire (a) so that the entire surface generates heat almost uniformly.

On the other hand, conventionally, a "brazing" method using a connecting terminal as illustrated in FIG. 7 is known as a method for connecting a polar wire having a diameter of about 20 μm. As shown in FIG. 7A, this connection terminal (c) is obtained by bending a clad material obtained by roll-bonding a non-molten metal (d) such as stainless steel and a molten metal (e) such as silver braze. When the ultrafine wire (F) is passed inside and the surface of the connection terminal (C) is irradiated with laser light (K) and heated, the molten metal (E) is melted and the ultrafine wire (F) is removed. Figure 7 after wrapping and cooling
As shown in (b), the ultrafine wire (f) and the connection terminal (c) are firmly connected.

Since the connection terminal (c) itself is relatively large and can be easily connected to other terminal portions, etc., it is also suitable for connecting the nichrome wire (a) and the lead wire (a) of the above-mentioned sheet heater. The use of such a connection terminal (c) is being studied.

[0005]

However, when the connection terminal (c) as shown in FIG. 7 is used for connecting the nichrome wire (a) of the planar heater, the nichrome wire (a) is the above-mentioned extra fine wire. Since it is about 10 times thicker than (f) (diameter 0.1 to 0.3 mm), the connection terminal (c) itself must be upsized and the space for its wiring must be increased.

However, when the size of the connection terminal (c) is increased, the total heat capacity is increased, and a large amount of heat must be applied. Also, the thermal conductivity is lowered, so that the molten metal (e) and the nichrome wire ( The temperature difference between a) expands, and molten metal (e)
Is difficult to fit in the nichrome wire.
In addition, the molten metal (e) below the connecting terminal (c) passage space is also difficult to melt.

Further, since the laser beam (K) applied to melt the molten metal (E) heats only the surface of the connection terminal (C) only partially, it melts the molten metal of a large-sized connection terminal having a large heat capacity. In order to melt, laser light (ki) must be irradiated for a long time, and as a result, there is a risk that even the non-molten metal (d) and the nichrome wire (a) in the irradiated portion will be melted.

In addition, since the nichrome wire (a) contains about 20% of chromium in its composition, when it is heated by laser light (ki), a chromium oxide film is formed on the surface and melts. Remarkably reduces the wettability of metal (e). For this reason, it is necessary to perform a flux treatment in advance to remove the oxide film of the nichrome wire (a). However, when flux is used, it is necessary to completely remove the flux after brazing to prevent corrosion. However, there is also a problem that the manufacturing process is troublesome because the cleaning process is required.

The present invention has been made in view of the above circumstances and solves the drawbacks of the conventional nichrome wire connecting method using a brazing terminal and easily connects the nichrome wire to the brazing terminal. The aim is to provide a new way of doing things.

[0010]

In order to solve the above-mentioned problems, the present invention provides a pattern-wiring nichrome wire,
In a planar heater having a lead wire for supplying an electric current to this nichrome wire, a connecting terminal made of a bent clad material having an opening on the upper surface, a non-molten metal on the outside and a molten metal on the inside A nichrome wire connecting method for a planar heater is characterized in that a nichrome wire is sandwiched, a light beam is applied to the opening to braze the nichrome wire and the connection terminal, and then the connection terminal and the lead wire are joined. provide.

Further, the present invention has a preferable aspect in which an inert gas is blown into the openings of the connection terminals before the irradiation of the light beam.

[0012]

In the method of the present invention, the nichrome wire and the lead wire of the planar heater are connected via the connection terminal.
The connection terminal is a bent clad material with non-molten metal on the outside and molten metal on the inside, and has an opening on the top surface.The molten metal inside the connection terminal is directly irradiated with a light beam from this opening. Then, the molten metal is melted and the nichrome wire sandwiched in the connection terminal and the connection terminal are connected for a single time, and the connection terminal and the lead wire are joined.

Further, by blowing an inert gas into the opening of the connection terminal before irradiating the light beam, formation of an oxide film during heating of the nichrome wire and the molten metal is prevented.

[0014]

EXAMPLES Examples will be shown below with reference to the accompanying drawings.
The nichrome wire connecting method of the present invention will be described in more detail. FIG. 1 is a perspective view showing an example of a connection terminal used in the connection method of the present invention. For example, the connection terminal (1) includes a bent portion (4) made of a clad material formed by rolling and joining a non-molten metal (2) such as stainless steel and a molten metal (3) such as silver braze, and a folded portion (4). The flat portion (5) made of non-molten metal extends from the upper surface of the curved portion (4). The upper surface of the bent portion (4) also has a circular opening (6).

When connecting the nichrome wire of the sheet heater to such a connection terminal (1), first, as shown in the perspective view of FIG. 2, the bent portion (4) of the connection terminal (1). )
The end of the nichrome wire (7) is doubled and clamped inside,
An inert gas (8) such as argon gas in the opening (6)
To blow. By doing so, as shown in the side cross-sectional view of FIG. 3, the inert gas (8) is released into the opening (6).
Since it penetrates into the inside of the bent part (4) and covers the surface of the nichrome wire (7) and the molten metal (3), they will not form an oxide film during heating in the next step, and they will be mutually efficient. Come into contact. In addition, the troublesome flux processing becomes unnecessary.

Next, as illustrated in FIG. 4, a light beam (9) is applied to the opening (6) of the connection terminal (1) and its periphery to melt the molten metal () inside the connection terminal (1). Melt 3), wrap the nichrome wire (7) and braze. In this case, unlike the laser beam used in the conventional method, the light beam (9) heats the surface of the connection terminal (1) over a wide range, so that the molten metal (3) inside can be uniformly melted. Further, since the light beam (9) also directly irradiates the nichrome wire (7) from the opening (6), the nichrome wire (7) itself is also heated, and the molten metal (3) and the nichrome wire (7) are discharged. Since the temperature difference between the two becomes smaller, it becomes easier for them to become compatible with each other. Moreover, since the light beam (9) directly irradiates the molten metal (3) on the lower side, the molten metal (3) on the lower side, which was difficult to melt by the conventional method, can be quickly melted. As a result, the amount of heat of the light beam (9) can be reduced and the irradiation time can be shortened, so that the non-melting metal (2) of the nichrome wire (7) and the connection terminal (1) is not deformed. .

In the connection terminal (1) thus connected to the nichrome wire (7), the flat plate portion (5) is connected to the lead wire (10) as shown in FIG. By connecting to the nichrome wire (7) and the lead wire (1
0) and can be electrically connected. By using this method, the nichrome wire (7) can be connected easily and reliably even when the lead wire (10) is made of a material such as a flat braided wire which is difficult to be directly joined to the nichrome wire (7). become.

Of course, the present invention is not limited to the above examples, and it goes without saying that various aspects are possible in details such as the shapes of the sheet heater and the connection terminals.

[0019]

As described in detail above, according to the present invention, the nichrome wire and the lead wire of the planar heater can be easily and surely connected by using the connection terminal.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a connection terminal used in the method of the present invention.

FIG. 2 is a perspective view illustrating one step of the method of the present invention.

FIG. 3 is a side cross-sectional view illustrating the state inside the connection terminal in the step shown in FIG.

FIG. 4 is a perspective view illustrating another step of the method of the present invention.

FIG. 5 is a plan view of a sheet heater in which a nichrome wire and a lead wire are connected by using the method of the present invention and an enlarged view of a main part thereof.

FIG. 6 is a plan view illustrating the structure of a conventional planar heater.

FIG. 7 is a process perspective view illustrating a method for connecting an ultrafine wire using a conventional connection terminal.

[Explanation of symbols]

 1 Connection terminal 2 Non-molten metal 3 Molten metal 4 Bent part 5 Flat plate part 6 Opening part 7 Nichrome wire 8 Inert gas 9 Light beam 10 Lead wire

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H05B 3/02 B 7913-3K 3/20 335

Claims (2)

[Claims] 1. A planar heater having a patterned nichrome wire and a lead wire for supplying an electric current to the nichrome wire, wherein the upper surface has an opening portion, the outside is a non-molten metal, and the inside is a molten metal. The nichrome wire is sandwiched between the connecting terminals made of the bent clad material, the opening is irradiated with a light beam to braze the nichrome wire and the connecting terminal, and then the connecting terminal and the lead wire are joined. How to connect the nichrome wire to the sheet heater. 2. The method for connecting a nichrome wire to a planar heater according to claim 1, wherein an inert gas is blown into the opening of the connection terminal before irradiating with the light beam.