JPH02503493A - Flat heating member having electrically resistive heating material and method for manufacturing the same - 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] Flat plate with electrically resistive heating material Heating member and its manufacturing method The invention relates to an electrical resistor embedded in an electrically insulating material and placed between two metal plates. The present invention relates to a flat heating member including a resistant heating section.

The present invention also relates to a method of manufacturing the heating member mentioned above.

The heating element contemplated by the invention is, for example, a heating back plate of a laundry iron or a cooking utensil. It is used as a heating base material.

The sole-plate of a laundry iron is usually made of aluminum or similar material. It is constructed of cast metal and has a tubular electric heating resistor embedded within it. cast gold The back plate of a laundry iron made of metal is expensive.

Two flat plates of electrically resistive material embedded in an insulating material are sandwiched between them. Efforts have been made to form flat heating members composed of flat metal plates. ing.

These metal plates are attached to each other by rivets or screws.

Such assembly methods are expensive.

Moreover, the assembly of this type of metal plate has hitherto not been solved in a satisfactory way. It does not pose a technically difficult problem.

In fact, such an assembly method does not allow the two plates to be assembled together, which could lead to destruction of the heating resistor. They must have the effect of overlapping each other in such a way as to avoid all heating points Must be.

Additionally, such methods require that the resistant material be exposed to external active agents such as steam and moisture. shall be carried out in such a way as to ensure protection from

The object of the present invention is to provide a flat heating member that is inexpensive to manufacture and satisfies the above-mentioned conditions. This is what we provide.

The present invention thus comprises two metal plates embedded in an electrically insulating material. A flat heating member including an electrically resistive heating material disposed between the The main focus is on According to the invention, the member of the invention comprises two metal plates, one in the heating material and the other insulating material as described above. A series of welds formed through grooves formed in and through the material It is characterized by being joined to each other by means of.

Welds formed through a groove formed in the heated material between these two plates The section makes it possible to obtain complete thermal continuity between the two plates, thereby Risk of failure of resistive materials as a result of hot points It can be avoided.

In a preferred embodiment of the invention, the two plate bodies are rolled metal, preferably rolled metal. Made of rolled aluminum.

By utilizing rolled metal, the construction of the heating element is economical.

In another preferred embodiment of the invention, the welding is performed by brazing. Such a solder joint is formed by joining two metal plates to one or both of them. Co-rolled (co-rolled) sheet-like brazed metal (brazin) g alloy).

To carry out the brazing process, just co-roll the assembly and braze the alloy sheet. It is necessary to heat it to the melting point.

In another preferred embodiment of the invention, at least one metal plate is electrically resistive. It has bosses that fit into grooves in the thermal material, and welding It is formed between such a boss portion and another metal plate.

In another preferred embodiment of the invention, at least one metal plate is part of the metal body. It has a protrusion that extends substantially along the entire periphery, and it cannot be welded. is formed between the protrusion and the peripheral portion of the other metal plate.

This welding is performed in this way by activating the heating element from an external source such as steam or moisture. It can be made impermeable to aggressive agents. be.

A method for manufacturing a flat heating member, which is still another aspect of the present invention, is as follows. It is characterized by being composed of processes. That is, the electrically heated material has a boss a step of fitting the boss into the groove of the heating material; heating the material, and brazing such an assembly will cause the alloy to melt. This is a heating process.

This operation is carried out so as not to generate any pressure on the plate. Preferably, it is carried out in a vacuum to prevent oxidation.

Other particular aspects and advantages of the invention will become more apparent from the following description. .

The illustrated embodiment is provided by way of example only.

Figure 4 is an exploded cross-section of three materials used in the heating member of the present invention. It is a diagram.

FIG. 2 shows a partial plan view of the lower plate of the heating member.

FIG. 3 is a cross-sectional view of the assembled heating element.

FIG. 4 is an enlarged sectional view of part A in FIG. 3 before brazing.

FIG. 5 shows a sectional view of the same part as in FIG. 4 after brazing.

In the example shown in the figure, the heating means for cooking or the back plate of the laundry iron is configured. The vine-like flat heating member has a cut-shaped resistor embedded in an electrically insulating material 3. formed by a sheet 2 made of a metallic metal and arranged between two metal plates 4 and 5. It has an electrically resistive heating material 1.

According to the invention, the two metal plates 4.5 (see FIGS. 3 and 5) are resistive heating elements. A series of grooves or openings (gap) 7.7a provided in the material 1. They are joined together by means of welds 60.

The two metal plates 4.5 are preferably rolled metal plates, in particular rolled aluminum plates. be.

In the embodiment shown, the weld 6 is a braze. There are two brazing The braze melted sheet 8 of the alloy is co-rolled on one or both of the metal plates 4, 5. It can be obtained by

In the illustrated example, the metal plate 5 is the target metal plate.

The lower metal plate 5 has bosses 9, 9a, which are made of electrically resistive heating material. It fits into the groove or opening 7, 7a of No.1.

The welding part 6 is formed between the bosses 9, 9a and the completely flat surface 4a of another metal plate 40. formed between.

Furthermore, as can be seen from FIGS. 1 to 3, the flat plate 5 is substantially It has a protrusion 10 that is extended and formed, and the welding part is connected to the protrusion 10 and other parts. It is formed between the plate-shaped body 40 and the peripheral edge 4b.

Such a projection 10 defines a small area through which the electrical connection 12.13 of the heating material should pass. It is formed along the entire periphery of the flat plate 5 except for.

The fluid tightness in this area is shown in the diagram. However, it can be achieved by other methods.

The resistive metal sheet 2 of the heating material 1 contains, for example, phenolic resin or silicone resin. covered with a sheet of two soaked fibrous materials; The bond between the sheet and the metal sheet must be heated so that polymerization of the resin is achieved. This is achieved by

However, brazing can be used with other electrical insulators if the melting temperature of the alloy is to be matched. Preferably, the material is used.

The bosses 9 and 9a are punched on the flat plate surface opposite to the flat plate surface on which the bosses are to be formed. By providing a cutting means, the flat plate 5 is semi-cutted. It can be obtained by

This means that the surface of the other flat plate facing the bosses 9 and 9a has a recess 11. lla explains the existence of

In order to manufacture the flat heating member described above, the manufacturing process is as follows.

The electrical heating material 1 is placed on a flat plate 5 provided with bosses 9 and 9a in the grooves or grooves of the heating material 1. The bosses 9, 9a are placed so as to fit into the openings 7, 7a.

A second flat plate 4 is laminated onto the heating material 1.

The assembly is heated to melt the layer 8 of the brazing alloy.

Preferably the heating of the assembly is carried out in a vacuum vessel (at 1O vacuum) to avoid any oxidation. -5) It is executed at around 1000 yen.

According to a non-limiting example, two flat plates 4.5 A rolled product commercially available as part number 3003 from It is an aluminum alloy.

For brazing, the alloy sheet 8 is co-rolled on top of the flat plate 5, but from the company. It must be an aluminum-silicon alloy, such as the one commercially available as part number 4104. I can also do it.

This brazing requires that the sheet of alloy be heated to a temperature lower than the melting temperature of the alloy that makes up the plate. It has a melting point on the order of 577°C.

During brazing, when the alloy layer 8 is melted, the surface tension strongly unites the flat plates 4 and 5. have a tendency to After cooling, the atmospheric pressure developed on the external surface of the flat plate 4.5 This tends to prevent any deformation of the flat plate. Any such deformation This is prevented in any case by the identical composition of the parts obtained.

As already understood, the invention is not limited to the example configurations described above. Rather, there may be many variations without departing from the scope of the invention.

Therefore, the brazing between the flat plates 4 and 5 is also arranged between the bosses 9, 9a and the protrusion 10. The brazing was done by the method of pastel (paBj i 11es) by alloy. It can also be executed.

Flat plates 4 and 5 are also made of mild steel (mild 5teel), stainless steel, copper, and steel. If the alloy is compatible with those metals and alloys, brazing is possible. can be used.

Furthermore, other methods of welding may also be employed. The following are mentioned in this connection: It is a good thing.

Friction welding: This method involves joining the materials is advantageous in that it can be joined at all points simultaneously without any increase in temperature. There is a point. However, this method has the disadvantage of subjecting the heated material to severe vibrations. There is.

Laser welding or electron beam welding: these two types of welding methods have favorable results occurs. That is, welding is accurate whether it is a point area or a linear area. It has the advantage of being limited to a limited area.

Ultrasonic welding; this is rather a shield formed by thermoplastic material and low temperature welding. It is prepared for thermal materials.

FIGj IG-4 international search report International search report Pr/! 7189/COD74

Claims (1)

[Claims] 1. embedded in an electrically insulating material and placed between two metal plates (4, 5) A flat plate heating member made of an electrically resistive heating material, wherein the two metals are The flat plates (4, 5) have grooves or holes formed in the heating material (1) and the electrically insulating material. (7) are joined together by means of a series of welds formed through the A flat heating member characterized by: 2. The method according to claim 1, wherein the two flat plates (4, 5) are rolled metal plates. Element. 3. The welded portion (6) is formed by brazing, and such brazing welding Brazing alloy co-rolled with one or both of the two metal plates (4, 5) It is characterized by being obtained by melting the sheet of (8). The member according to claim 1 or 2. 4. At least one of the plates (5) has grooves or grooves in the electrically resistive heating material (1). has a post (9, 9a) that fits into the opening (7, 7a), and the welded part (6) is formed between the post (9, 9a) and the other flat plate (4). The member according to any one of claims 1 to 3. 5. At least one of the flat plates (5) has a surface area of 100 mm over the entire periphery of the flat plate. It has an extended protrusion (10), and welding is performed between the protrusion (10) and another flat plate (4). ) is formed between the peripheral edge of the Any member described in item 1. 6. The electrically resistive heating material (1) is coated on both sides with a sheet of insulating material (3). consisting of a cut sheet (2) of resistive metal coated with and the heating material exhibits resistance to the melting point of the brazing alloy. The member according to any one of claims 1 to 5. 7. The resistant metal sheets (2) are two sheets of fibrous material impregnated with resin. covered with a sheet of fibrous material and a sheet of metal; are bonded together by heating to ensure polymerization of the resin. 7. The member according to claim 6. 8. The boss (9, 9a) is the surface of the flat plate opposite to the surface on which the boss is to be formed. The material obtained by cutting the flat plate (5) in half by means of a punch applied to A member according to any one of claims 4 to 7, characterized in that it is. 9. The heating member is characterized in that it constitutes the heating back metal plate of the laundry iron. A heating member according to any one of claims 1 to 8. 10. characterized in that the heating member constitutes a heating base of the cooking device; A heating member according to any one of claims 1 to 6. 11. Electric heating material (1) is placed on a flat plate (5) having bosses (9, 9a). The boss is arranged so as to fit into a groove or aperture (7) provided in the heating material 1. a second flat plate (4) is placed on the heating member (1); the assembly and heating the brazing alloy (8) so as to melt the brazing alloy (8). 9. A method of manufacturing a flat heating member according to any one of 8. 12. 12. The heating of the assembly according to claim 11, characterized in that heating of the assembly is carried out in a vacuum chamber. Method.