JPH0767785A - Heating cooker - Google Patents

Abstract

PURPOSE:To provide a heating cooker the temperature distribution on the surface of which is easily made uniform and which is excellently durable and bearable to a long term usage. CONSTITUTION:A heating plate 1 comprising heat resistant heat resistant alloy plates 1a, 1b and 1c and copper plates 2a and 2b alternatively laminated, e.g. the heat resistant alloy plates 1a and 1c constitute the top and the bottom surfaces, and resistance elements 3 for heating are to be mounted on the heating cooker. Thus, the temperature distribution on the heating plate has been greatly improved and, furthermore, a heating cooker which keeps the flatness of the heating plate for a long time can be embodied. By sealing the edges of the heating plate with a heating plate fastening ring comprising Ni wax or heat resistant steel, oxidation of the copper plate can be prevented and a highly durable heating cooker can be embodied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a commercial cooker for heating a hot plate from below with a heat source, particularly okonomiyaki, yakisoba,
The present invention relates to a heating cooker that directly cooks hot cakes, crepes, roasted meat, etc. on a hot plate.

[0002]

2. Description of the Related Art Conventionally, the construction of a hot plate of this type of cooking device is shown in FIG. As shown in the figure, a hot plate 7 made of a thick plate having a thickness of 15 to 20 mm made of stainless steel, iron casting, ceramics or the like is placed in contact with the electric heater 6 and the thick plate is heated by the above heat source. The ingredients placed on it were cooked. In the case of a commercial cooker, a gas or oil burner is also used as a heat source in addition to the above electric heater, but the temperature control and temperature distribution of the hot plate must be empirically manually adjusted by the cook. It was done by adjusting the heating power of the heat source. This coordination was fairly difficult and required many years of experience.

Further, as a household heating cooker, a cooker in which a heating plate is heated by an electric heater, a temperature sensor is provided on the heating plate or the electric heater, and the temperature of the heating plate is controlled by the temperature sensor is practically used. No. 60-86231.

[0004]

However, in the conventional heating cooker as described above, since the stainless steel plate having low thermal conductivity or the thick plate made of cast iron is used, the temperature distribution over the entire cooking surface is not uniform. There was a problem of becoming uniform.
Therefore, it cannot be said that the cooking quality of the cooked product is excellent.

Further, since the temperature distribution is non-uniform, the hot plate causes thermal strain, the flatness of the cooking surface is deteriorated, and it takes a lot of time to polish the surface for maintaining the flatness, and the long-term is required. There was a problem that could not withstand the use of.

Further, since the back surface of the hot plate is directly exposed to the flame of gas or petroleum, there is a problem that the oxidative deterioration progresses and the hot plate deteriorates in a short period of time.

The present invention solves such problems, and it is a first object of the present invention to provide a heating cooker provided with a heating plate in which the temperature distribution on the heating cooking surface is likely to be uniform.

A second object of the present invention is to provide a heating cooker provided with a hot plate which improves durability of the hot plate and withstands long-term use.

[0009]

[Means for Solving the Problems] A first means of the present invention for achieving the first object is a hot plate in which heat-resistant alloy plates and copper plates are alternately laminated and upper and lower surfaces are made of heat-resistant alloy plates. And a heating means for heating the hot plate.

A second means of the present invention for achieving the second object is to seal the end portion of the hot plate with a hot plate fixing ring made of heat resistant steel.

[0011]

According to the first means described above, the heat-resistant alloy plate having a poor thermal conductivity and the copper plate having a good thermal conductivity are alternately laminated and combined, so that the heat in the plane direction of the hot plate is The diffusion can be improved to improve the uniformity of the temperature distribution on the heating surface.

For example, by alternately laminating an austenitic stainless steel plate and a copper plate having substantially the same thermal expansion coefficient, stress due to thermal expansion is unlikely to occur between the layers. Further, the austenitic stainless steel sheet improves the creep characteristics between the layers. Due to these interlayer properties, the laminated hot plates can maintain flatness for a long period of time,
It is possible to provide a heating cooker having a hot plate with high durability.

According to the second means, the hot plate is constructed by sealing the ends of the hot plate whose upper and lower surfaces are made of heat resistant alloy plates with the hot plate fixing ring made of heat resistant steel. Oxidation from the edge of the copper plate is prevented, and the durability of the hot plate is improved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A heating cooker according to an embodiment of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 shows the structure of a hot plate used in the heating cooker of this embodiment. As shown in the figure, the heat plate 1 is composed of heat-resistant alloy plates 1a, 1b and 1c such as stainless steel and high heat conductive copper plates 2a and 2b, which are alternately laminated. 1a and 1c are arranged. Further, the resistance heating element 3 is arranged on the lower surface of the hot plate with good thermal conductivity. The end faces of the hot plate 1 are all sealed with a heat and oxidation resistant sealant made of Ni brazing material or the like.

In the hot plate of Example 1, the heat resistant alloy plates 1a, 1
SUS304 plates having a thickness of 0.5 mm were used as b and 1c, and oxygen-free copper plates having a thickness of 1.0 mm were used as the copper plates 2a and 2b having high thermal conductivity. The heat-resistant alloy plates 1a, 1b, 1c and the copper plates 2a, 2b having high thermal conductivity are adhered and laminated using a processing method such as explosive welding, cut into a disk having a diameter of 150 mm, and the hot plate 1 is produced. did. A spiral sheathed heater (1500 w at 100 v) was brazed to the lower surface of the hot plate 1 to prepare a hot plate for a heating cooker.

The temperature distributions on the heating surfaces of the above hot plate and the conventional hot plate were measured and compared. As a conventional hot plate, a spiral sheathed heater having the same shape and the same capacity as the hot plate of the present embodiment was brazed to the lower surface of a disk made of SUS304 having the same shape as the hot plate of the present embodiment. The result of the comparative measurement shows that the conventional hot plate has a temperature distribution of 571 ± 43.0 ° C., whereas the hot plate of the present embodiment has a high temperature of 612 ± 7.5 ° C., and the temperature distribution is high. Was small.

The reason why the hot plate of this embodiment has a better temperature distribution than the conventional hot plate will be described below. The heat generated by the resistance heating element 3 is generated from the heat-resistant alloy plate 1a in the lowermost layer to the copper plate 2 in the second layer.
a, the heat-resistant alloy plate 1b of the third layer, and the copper plate 2b of the fourth layer, respectively, to be transferred to the heat-resistant alloy plate 1c of the uppermost fifth layer forming a heating surface. The heat conductivity of the heat-resistant alloy plates that make up the first, third, and fifth layers is 14 to 20 kcal / mh.
C., and the thermal conductivity of the copper plates forming the second and fourth layers is 320 to 332 kcal / mh.degree. In this way, in the hot plate of the present embodiment, the heat conduction of the copper plate is larger than the heat conduction of the heat-resistant alloy plate, so the heat emitted from the resistance heating element is applied to the surface rather than penetrating the hot plate at right angles to the surface. It becomes easy to spread horizontally. As a result, the temperature distribution on the heating surface of the uppermost layer is improved.

Further, in this embodiment, the end portion of the hot plate 1 is covered with Ni brazing material and sealed. This end surface treatment can prevent the copper plate constituting the hot plate from being oxidized and enhance the durability of the hot plate.

In the present embodiment, the heating cooker having the five-layer hot plate has been described, but the present invention is not limited to this, and a three-layer or more multilayer hot plate may be used. The same effect can be obtained.

(Embodiment 2) Next, the structure of the hot plate of Embodiment 2 is shown in FIG. As shown in the drawing, the end of the hot plate 1 is sealed by welding the entire circumference of the end of the hot plate using a hot plate fixing ring 4 made of heat resistant steel. With this configuration, the durability of the hot plate can be further enhanced.

Furthermore, in this embodiment, the heat-resistant alloy plates 1a, 1b, 1c constituting the hot plate 1 are made of austenitic stainless steel having a thickness of 0.5 mm, whereby the durability of the hot plate can be further enhanced. it can. That is, the coefficient of thermal expansion of austenitic stainless steel is 150 × 10 ⁻⁷ / ° C. to 1
The thermal expansion coefficient of the copper plate is approximately 150 × 10 ⁻⁷ / ° C. to 173 × 10 ⁻⁷ / ° C., while it is 73 × 10 ⁻⁷ / ° C. A hot plate made of a material having the same coefficient of thermal expansion as described above is unlikely to generate thermal stress between layers even when heated, and is unlikely to cause delamination. Furthermore, since the austenitic stainless steel sheet is contained in the intermediate layer of the five-layer structure, the creep property is also excellent. Therefore, since the hot plate of this embodiment maintains the flatness for a long period of time, it is not necessary to perform maintenance for maintaining the flatness, and the hot plate has high durability.

The stainless steel plates that can be used for the hot plate of this embodiment are SUS201, 301, 302, 30.
3,304,305,309,310,310S, 31
There are 6,321 etc., but SUS30 is preferable.
4,310S, 316,321. In particular, SUS310S is desirable to avoid high temperature creep.

The evaluation results regarding the high temperature creep property will be described below. SU with a thickness of 0.5 mm as an evaluation sample
A hot plate of this embodiment having a total thickness of 5.0 mm and a 7-layer structure in which four S310S plates and three copper plates having a thickness of 1.0 mm are laminated;
A hot plate of a comparative example in which two 0.5 mm thick SUS310S plates and one 4.0 mm thick copper plate were laminated was used. A 100v, 2500w spiral sheathed heater was brazed to the hot plate. The hot plate was turned on for 30 minutes, and then turned off for 10 minutes, repeated 1000 times to measure the flatness. as a result,
The hot plate of this example has a flatness of 0.2 mm, the hot plate of the comparative example has a flatness of 1.0 mm, and the hot plate of this example can maintain the flatness for a long period of time.

(Embodiment 3) FIG. 3 shows the construction of a hot plate of a heating cooker according to Embodiment 3. The hot plate of this embodiment has the same basic configuration as that of the first and second embodiments. The hot plate 1 is composed of a laminated body of a heat-resistant alloy plate and a heat conductive copper plate, a resistance heating element 3 is provided on the lower surface thereof, and a cooling pipe 5 for cooling by flowing a fluid to finely adjust the temperature of the hot plate. Is brazed. The hot plate configured as described above is used for the resistance heating element 3 during cooking.
When it is necessary to cool the hot plate during or after cooking, water or air is caused to flow through the cooling pipe 5 to cool the hot plate at a desired rate. With this configuration,
Fine cooking can be achieved.

[0026]

As is apparent from the above description of the embodiments, according to the first invention, heat-resistant alloy plates and heat-conductive copper plates are alternately laminated, and upper and lower surfaces are composed of heat-resistant alloy plates, and the lower surface By disposing a resistance heating element in the heating element, it is possible to realize a heating cooker capable of significantly improving the temperature distribution and further maintaining the flatness of the heating plate for a long period of time.

According to the second invention, in addition to the hot plate of the first invention, the end of the hot plate is sealed with a hot plate fixing ring made of Ni braze or heat resistant steel to oxidize the copper plate. It is possible to realize a heating cooker that is highly durable and durable.

According to the third invention, in addition to the hot plate of the first invention, by providing a cooling means, the temperature of the hot plate of the heating cooker can be finely adjusted, and heating and cooling can be arbitrarily performed. A heating cooker that can be performed can be realized.

[Brief description of drawings]

FIG. 1 is a sectional view showing a configuration of a hot plate of a heating cooker according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing an end face configuration of a heating plate of the heating cooker according to the second embodiment.

FIG. 3 is a sectional view showing a schematic configuration of a hot plate of the heating cooker according to the third embodiment.

FIG. 4 is a cross-sectional view showing a schematic configuration of a heating plate of a conventional heating cooker.

[Explanation of symbols]

 1 Hot Plate 1a, 1b, 1c Heat Resistant Alloy Plate 2a, 2b Copper Plate 3 Resistance Heating Element 4 Hot Plate Fixing Ring 5 Cooling Pipe

Claims (4)

[Claims] 1. A heating cooker comprising a heat plate in which heat-resistant alloy plates and high-heat conductive plates are alternately laminated and whose upper and lower surfaces are made of heat-resistant alloy plates, and heating means for heating the hot plates. 2. The cooking device according to claim 1, wherein the high heat conductive plate is a copper plate. 3. The cooking device according to claim 1, wherein an end of the hot plate is sealed with a hot plate fixing ring mainly made of heat resistant steel. 4. The heating cooker according to claim 1, wherein a cooling pipe through which a cooling medium flows is provided in contact with the hot plate.