JPH0441012B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a heating cooker that uses a fluid fuel such as city gas, LP gas, natural gas, or petroleum, or electricity as a heating source, and particularly relates to a commercially available heating cooking device that uses fluid fuel or electricity as a heating source. This invention relates to a heat retention device for a heating cooker that can be used with high thermal efficiency by simply attaching a simple device to the cooker. [Conventional technology] There are six methods of heating and cooking: boiling, steaming, boiling, baking, sauteing, and frying. Of these, boiling, steaming, and boiling require the heat of the cooking device to be kept warm for a long time with low heat (slow heat), and they account for the majority of cooking in terms of the amount of heat used. It is said to be a thing. [Problems to be solved by the invention] However, reducing the amount of gas supplied in order to lower the heat not only makes it difficult to maintain the set heat retention temperature, but also causes problems such as wind from windows, cross drafts from ventilation fans, etc. There is a danger that boiling over will cause a meltdown and produce raw gas. In addition, in conventional gas appliances, once the fire is extinguished, heat is rapidly dissipated from the gas appliance made of a material with good thermal conductivity and the appliance is cooled down, so it cannot be expected to retain heat due to the residual heat of the gas appliance. (In the case of electrical appliances, there are some that switch the output between high, medium, and low, but the temperature difference is large and it is difficult to obtain an appropriate temperature setting. (Means to solve the problem) As mentioned above, even if the fire is extinguished, the heat retention using residual heat continues for a relatively long time, and cooling progresses gradually. For example, most cooking can be completed safely without the need for supervision. Water is also required for steaming and boiling, but it is easier to cook without water. On the other hand, there are some cooking devices that use infrared heating to improve the heating efficiency of the cooking device. The infrared rays emitted from the heating element are uniformly and concentratedly irradiated onto the object to be heated by the reflective optical system in the form of electromagnetic waves, and are not irradiated to surrounding areas that do not require heat, so there is little energy loss. In addition, infrared rays are absorbed by absorbers in their path, causing unique vibrations in the atomic structure of molecules of objects and generating heat. Ceramic, tungsten, silicon carbide, etc. are used as infrared emitting materials, but ceramic or ceramic coating is currently considered to be the best. Furthermore, if the metal parts of the heat insulating device are coated with ceramic, not only can the high temperature state be maintained for a long time, but also the heat resistance of the metal parts can be improved. The purpose of the present invention is to eliminate the above-mentioned drawbacks of conventional heating cookers, maintain heat retention by simply attaching a simple device to a commercially available heating cooker, and further incorporate an infrared heating effect using ceramic coating. The purpose of the present invention is to provide a heating cooker capable of waterless cooking in the same way as an oven without using foil, which further improves thermal efficiency. The heat retention device is used by being attached to the heat generating part, and includes a horizontal heat transfer plate made of a thermally conductive material, fixed vertically to the lower surface of the heat transfer plate, and having a shape approximately equal to the heat generating part. A heat insulating tube made of a heat insulating material and having a lower opening of the same area, and a heat storage member made of a thermally conductive material held at a predetermined position in the heat insulating tube, and at least one of the heat transfer plate and the heat insulating tube is provided. Infrared ray generation treatment such as ceramic coating is applied to each inner surface and almost the entire surface of the heat storage member, and there are many through holes that generate elastic waves including ultrasonic waves when flames or heated air flow passes through and blows out. Provided is a heat retaining device for a cooking device, characterized in that the heat transfer plate and the heat storage member are provided with the following. [Example] Hereinafter, the present invention will be explained with respect to a gas heating cooker (gas stove).The heat retaining device 4 of the present invention is installed on the heat generating part (burner head) 2 of the gas burner 1 via the top plate 3 of the gas stove. is placed (Figure 1). The heat retention device 4 includes a heat transfer plate 5, a heat shield cylinder 6, and a heat storage section 7.
including. The heat transfer plate 5 is a circular thin plate made of a thermally conductive material such as copper and arranged horizontally, and is provided with a large number of through holes 8 in the thickness direction over its entire surface. Also, at least a ceramic coating is applied to the lower surface. The heat transfer plate 5 is fitted into a circular opening in the top plate 3 of the gas stove via a heat insulating packing 9. A portion of the through hole 8 is shown in FIG. In the figure, 5' indicates a ceramic coating applied to the front surface of the heat exchanger plate 5 as an infrared ray generation treatment. The heat shield tube 6 is vertically fixed to the lower surface of the heat exchanger plate 5, and is made of, for example, a round metal tube (not shown) wrapped with a heat insulating material such as asbestos or plaster.
Ceramic coating is applied to the inner surface of the metal cylinder. Further, the inner diameter of the lower opening of the heat shield cylinder 6 is formed to be approximately equal to the outer diameter of the burner head 2. A heat storage member 7 is attached to the heat transfer plate 5 or the heat shield tube 6 at a predetermined position of the heat shield tube 6 via metal fittings (not shown). The heat storage member 7 is made of a thermally conductive material such as a stainless steel plate, has a large number of through holes 10 similar to the heat transfer plate 5, and is coated over almost the entire surface with ceramic coating. The heat exchanger plate 5, heat shield cylinder 6, and heat storage member 7 are coated with ceramic on the surface facing the burner head 2 and on the inside of the through hole, so the ceramic treated area is extremely large, and therefore the infrared heating effect is improved. becomes large. In addition, since the heat shield cylinder 6 almost surrounds the burner head 2, it helps stabilize the flame, and the flame (heated air flow when the heat generating part 2 is an electric heater) is directed through the small diameter through holes 8, 10. When it passes through and ejects, high-frequency vibrations (elastic waves) including ultrasonic waves are generated in an elastic body, that is, a gas such as a flame-heated air current, or a solid such as the heat storage member 7 or the heat transfer plate 5. However, the flame and heated air flow cause disturbance (high-frequency vibration) on the surface of the heated surface of the pan and destroy the boundary layer, further improving the heating effect. When the heat retaining device 4 formed as described above is placed on a gas table and ignited, the combustion gas is heated to a high temperature in the space surrounded by the heat transfer plate 5, the heat shield cylinder 6, and the heat storage member 7. The heating effect is further enhanced by infrared heating. Furthermore, even after the fire has been extinguished, the large surface area of each component and ceramic treatment provide a long-lasting heat retention effect. Figure 3 compares the heat retention effects of a conventional gas stove and a gas stove using the heat retention device of the present invention.
The time taken to cool down to ℃ was measured. As shown in the figure, a large difference was observed: approximately 6 minutes for the former and approximately 17 minutes for the latter. The mark in the figure is the conventional device. The △ mark indicates the temperature change of the device of the present invention. In addition, with conventional gas stoves, if you raise the temperature by 50℃ above the initial temperature and then extinguish the water, there is almost no increase in the water temperature after that, but with this device, the water temperature will increase by 10℃.
There was a rise in water temperature. The results of the cooking experiment are shown in the table below.

〔Effect of the invention〕

According to the present invention, even when the heat source using fluid fuel is kept at low heat to keep it warm, there is no need to worry about it going out, so there is no need for monitoring. Additionally, even when water is required for normal cooking, waterless cooking becomes possible. Furthermore, since the insulating device of the present invention is simply attached to a normal heating cooker, it is easy to modify and handle, and since infrared heating is used, there is little heat transfer loss.
Therefore, it has effects such as low running costs.

[Brief explanation of drawings]

Figure 1 is a vertical sectional view of the device of the present invention, Figure 2 is an enlarged view of the heat exchanger plate, Figure 3 is a diagram showing a comparison of the heat retention effect with a conventional device, and Figures 4 and 5 are heat storage members. FIG. 3 is a vertical cross-sectional view and a horizontal cross-sectional view showing another embodiment of the invention. 2 is a heat generating part, 4 is a heat retaining device, 5 is a heat transfer plate, 6 is a heat shield cylinder, and 7 is a heat storage member.

Claims (1)

[Claims] 1 A heat retention device that is used by being attached to the heat generating part of a cooking device that uses fluid fuel or electricity as a heat source, which includes a horizontal heat transfer plate made of a thermally conductive material and a vertical heat transfer plate perpendicular to the bottom surface of the heat transfer plate. a heat insulating tube made of a heat insulating material and having a lower opening of approximately the same shape and area as the heat generating part; and a heat storage member made of a thermally conductive material held at a predetermined position within the heat insulating tube. At least each inner surface of the heat transfer plate and heat shield cylinder and almost the entire surface of the heat storage member are treated with infrared rays such as ceramic coating, and when the flame or heated airflow passes through and blows out, 1. A heat retention device for a heating cooker, characterized in that the heat transfer plate and the heat storage member are provided with a large number of through holes that generate elastic waves including sound waves.