JPH0722078Y2 - Plate heater - Google Patents

Description

TECHNICAL FIELD The present invention relates to a plate heater used for an electric stove or the like.

2. Description of the Related Art As a plate heater used in a conventional electric stove, for example, as disclosed in Japanese Utility Model Laid-Open No. 1-158689, a pot made of austenitic stainless steel is used, and a heat generating member composed of a sheathed heater is provided on the lower surface of the plate. There is a structure in which Ni brazing material is used for adhesion, the surface of the plate is provided with groove-shaped irregularities, and surface treatment is applied by heat-resistant coating.

Problems to be Solved by the Invention In such a structure, since the base material is an austenitic stainless steel material, there is a sensitization phenomenon in the range of 500 to 700 ° C, although it depends on the content of carbon (C) in the contained components. Causes intergranular corrosion. High temperature (600 ℃ or more) depending on the ingredients
In that case, oxidation is promoted, and oxide scale is generated, which impairs quality. Therefore, it is necessary to install a temperature control mechanism to protect the upper limit temperature. For this reason, there is a drawback that the amount of heat is insufficient for cooking using heat radiation.

Means for Solving the Problems The present invention has been made to solve the above-mentioned drawbacks, and uses a plate made of super heat-resistant grooves (NCF800-equivalent product), and a pipe material made of the same material as the plate on the back surface of the plate. While closely contacting with a sheathed heater made of Ni through a brazing filler metal, the surface of the plate is sprayed with iron oxide, ceramics or the like to cover the surface treatment layer.

Action The super heat resistant groove (NCF800 equivalent product) is a material that contains less or almost no C in comparison with conventional stainless steel materials, etc., and is corrosion and acid resistant even at high temperatures (600 ° C or higher) compared to stainless steel materials etc. Excellent in chemical resistance and high temperature strength.

This invention uses this super heat resistant groove for the plate and the metal pipe of the sheathed heater, and by coating the surface of the plate with a surface treatment layer by thermal spraying, the surface of the plate is less likely to wear compared to painting and heat resistance. It also has strong adhesion. In addition, all of the materials are of the same type of material that can withstand high temperatures, that is, there is no concern about sensitization, and no oxide scale is generated even at high temperatures, so a temperature controller is unnecessary. In addition, it can be used in a red heat state, and the lack of heat can be eliminated even when cooking when radiating heat. Naturally, the deformation that occurs during expansion and contraction can be suppressed to a low level.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

The structure of the embodiment is shown in FIGS. 1 and 2. Reference numeral 1 is a disc-shaped plate made of super heat-resistant steel (NCF800 or equivalent), with a plate thickness of 2 mm or less used to facilitate press working, and iron oxide or ceramic material (showing black) on the surface The surface treatment layer 7 is coated by plasma spraying. Reference numeral 2 is a sheathed heater, which is formed in a semicylindrical shape to improve the close contact with the plate 1, and is further formed in a spiral shape. The sheathed heater 2 uses a metal pipe 3 made of the same material as the plate 1. The metal pipe 3 is filled with an insulating material MgO5 and the insulating material 5 is embedded with heat generation resistance 4. Reference numeral 6 denotes a Ni brazing material, which is used to adhere the sheath heater 2 to the back surface of the plate 1.

Effect of the Invention According to the present invention, both the plate and the sheath heater are made of super heat resistant steel, and the surface treatment layer also has super heat resistance and corrosion resistance,
It has excellent heat resistance and can be used by raising it to a red hot state (600 ° C or higher), and the power such as heat can be increased. (A temperature controller etc. is not required to be installed.) Also, since the plate and sheath heater are made of the same material, there is little deformation due to expansion and contraction, and the plate thickness can be 2 mm or less, which is easy to press, Therefore, heat conduction and thermal efficiency can be improved, and cost can be reduced. When the product is made into red heat, it is visually appealing and has a good appearance. Furthermore, since the surface of the plate is subjected to thermal spraying, the temper color unique to SUS material is not unsightly when heated.
Since the sprayed surface has minute irregularities, it has a large surface area, and because it has a black color, it has a very good heat dissipation. Furthermore, the thermal spraying process provides a safe and reliable plate heater that is harder than pots and kettles, has a strong abrasion resistance, and so on.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a plate heater according to the present invention,
FIG. 2 is an enlarged sectional view of the same. 1 is a plate, 2 is a sheath heater, 3 is a metal pipe,
6 is a brazing material.

Claims (1)

[Scope of utility model registration request] 1. A sheathed heater (2) using a metal pipe (3) made of the same material as the plate (1) on a back surface of a plate (1) made of super heat-resistant steel, with a Ni brazing material (8) interposed therebetween. A plate heater that can be used in a red-hot state because it is in close contact with the surface of the plate (1) and has a surface treatment layer (7) formed by thermal spraying of a highly heat-resistant metal oxide material, ceramic material, or the like.