JPS6319170B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a temperature sensing device for detecting the bottom temperature of a pot in the field of cooking equipment. Conventional configurations and their problems In the past, there have been some examples in which the temperature at the bottom of a specific pot is detected using a temperature sensing device installed in the center of a cast-in type heater, etc. Then,
None of the temperature-sensing devices could satisfactorily detect the bottom temperature of the pot, and was influenced by the surrounding heaters and judged to be higher than the actual bottom temperature, so no temperature-sensing device could be put to practical use. OBJECTS OF THE INVENTION The present invention provides a temperature sensing device for detecting the temperature at the bottom of a pot, which can be used even if it is installed in the center of a heating element. Composition of the Invention The temperature-sensing device for a cooking appliance according to the present invention is configured to accurately transmit the temperature of the bottom of the pot to the temperature-sensing element, which is the heat-sensing part, and includes a heat-resistant support such as ceramics with poor thermal conductivity to hold the temperature-sensing element. A temperature sensing element is also included inside a heat conductor with good thermal conductivity that includes the upper part of the member, and the upper part of the heat conductor is pressed by a spring material to a contact plate in contact with the bottom of the pot via a heat resistant support member. The heat from the bottom of the pot is transferred from the heat conductor to the top of the heat-resistant support member, and the temperature sensing element is surrounded by the heat from the bottom for accurate heat transfer. This prevents the temperature sensing element from being affected by direct heat from the heater by blocking the radiant heat from the heater. DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 shows a configuration example without a pot, in which a temperature sensing device 3 is fixed to a support fitting 2 that holds a spiral sheathed heater 1, and a contact plate 4 of the temperature sensing device 3 is positioned with respect to the sheathed heater 1. ing. The contact plate 4, which serves as a protective cover for the entire heat-receiving and temperature-sensing device 3 and blocks radiant heat from the sheathed heater 1, conducts heat through the flange portion of the heat-resistant support member 6, which has poor thermal conductivity, by a spring member 5 made of a disc spring. The thermal conductor 7, which has good properties, is pressed. A temperature sensing element 8 serving as a temperature detection section is configured by being held by the heat resistant support member 6 and included in the heat resistant support member 6 and the heat conductor 7. The upper flange of the holding cylinder 9 that holds the spring material 5 is held between the inner cylinder 10 and the contact plate 4, and the inner cylinder 10 is similarly fixed by being caulked at several places on the outer periphery of the flange by the bent tongues of the contact plate 4. has been done.
The inner cylinder 10 is slidable on the bottomed outer cylinder 11, and the inner cylinder 1
Movement is restricted at the lower end of 0. The holding cylinder 9 is pushed upward by a coil spring 12 held at the bottom of the outer cylinder 11. FIG. 2 shows the configuration when the pot 13 is placed. In this case, the coil spring 12 is compressed and the contact plate 4 is lowered to be flush with the sheathed heater 1 and in contact with the bottom of the pot 13. Hereinafter, the operation of detecting the temperature at the bottom of the pot 13 will be explained with reference to FIG. In FIG. 2, the heat from the red-hot sheathed heater 1 is radiated and transmitted. Radiant heat heats the cylindrical part hanging down on the outer periphery of the contact plate 4 as well as the outer tube 11, while transferred heat heats the outer tube 11 through the support fitting 2. heated. On the other hand, when water is in the pot 13 at the bottom of the pot 13 except for the surface that is in contact with the sheathed heater 1, the temperature is approximately close to that of the water. Therefore, all the outer surfaces of the contact plate 4 of the temperature sensing device 3 other than the surface in contact with the bottom of the pot 13 are at a higher temperature than the bottom of the pot 13. The contact plate 4 is convex upward and has a radius of curvature of 1600 mm in order to more accurately pick up the temperature at the bottom of the pot 13.
It is constructed with the above-mentioned gently curved surface and has a wide contact area with the pot 13. Further, a cylindrical portion hanging down at the outer periphery is provided to block radiant heat from the sheathed heater 1. Since the outer periphery is heated to a very high temperature, stainless steel is used in consideration of its heat resistance. Furthermore, in order to transmit the temperature at the bottom of the pot 13 to the temperature sensing element 8, it is necessary to transmit heat in the vertical direction well, so the thickness of the plate must be reduced.
It is kept below 0.6mm. Because the board is thin, heat is not easily transmitted in the horizontal direction, and heat from the surroundings is transmitted to the pan 13 at the contact portion with the pan 13, making it difficult to transmit to the center. Next, the heat conductor 7 contacts the contact plate 4 to transmit the temperature of the bottom of the pot 13 to the temperature sensing element 8, so the surface in contact with the contact plate 4 is made wider with a flange configuration, and the lower part is designed to increase responsiveness. It has a small diameter and a small heat capacity. The heat conductor 7 encloses the temperature sensing element 8 together with the heat resistant support member 6 made of ceramics or the like, and the temperature of the temperature sensing element 8 is also kept close to the temperature of the bottom of the pot 13. Further, the heat-resistant support member 6 is provided with an outer cylinder 11 at the lower part.
Since the upper part of the heat-resistant support member 6 is wrapped in the heat conductor 7, the heat-resistant support member 6 and the temperature-sensitive element 8 are placed in the pot 13 at the same time. The structure is designed to bring the temperature close to the bottom temperature. The material of the thermal conductor 7 is aluminum considering its heat resistance, corrosion resistance, and good thermal conductivity. Heat conductor 7 via heat resistant support member 6
The spring material 5 that presses the contact plate 4 is made of a stainless steel disc spring so as not to increase the height of the holding cylinder 9 that is held therein, and the spring material 5 presses the contact plate 4 from the bottom surface of the outer cylinder 11 heated by the sheathed heater 1. The overall shape was designed to be small in order to avoid being affected by the radiant heat. Furthermore, since the holding cylinder 9 is a concentric cylinder with the inner cylinder 10 and is in contact with only the flange end, it is relatively less susceptible to external heat, and the temperature sensing element 8 is spatially isolated from the outside, so it is not sensitive to heat. By blocking heat transfer due to convection inside the heating device 3, the outer cylinder 1
1 and the inner cylinder 10 toward the temperature sensing element 8. Due to the heat transfer mechanism described above, the temperature sensing device 3 can accurately detect the temperature at the bottom of the pot 13. FIG. 3 shows temperature rise curves of various parts when water is boiled using the configuration of the example. In FIG. 3, A shows the water temperature, B shows the temperature of the temperature sensing element, C shows the bottom surface temperature of the outer cylinder, and D shows the temperature of the cylindrical part hanging down on the outer periphery of the contact plate. Even though the temperature of the outer wall portion of the temperature sensing device 3, represented by the cylindrical portion hanging down on the outer periphery of the contact plate 4 and the bottom surface portion of the outer tube 11, is high, the temperature of the temperature sensing element 8 becomes almost parallel to the water temperature. It can be seen that the temperature at the bottom of the pot 13 is accurately detected. The main experimental conditions in FIG. 3 are shown in Table 1.

【table】

[Table] The materials of the temperature sensing device are as follows. Contact plate 4...Stainless steel heat conductor 7...Aluminum heat resistant support member 6...Glass ceramic spring material 5...Stainless steel spring material All other constituent members are stainless steel. Effects of the Invention As is clear from the above description, the temperature sensing device according to the present invention can accurately detect the temperature at the bottom of the pot without being affected by the heat from the red-hot heater located nearby. Since the contact plate is made of stainless steel, it has a structure with excellent heat resistance and corrosion resistance, and has good response. As can be seen from the application example, the inflection point at the boiling point of water and the inflection point of the temperature rise curve of the temperature sensing element exactly match.
A ground-breaking application is also conceivable, in which the boiling point of water can be detected using an external temperature-sensing device. In addition, oil temperature control, etc.
Various industrial uses are possible.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a temperature-sensing device according to an embodiment of the present invention, Figure 2 is a cross-sectional view of the temperature-sensing device in use, and Figure 3 is a temperature increase in various parts when water is boiled with the same temperature-sensing device. It is a curve diagram. 4... Contact plate, 5... Spring material, 6... Heat resistant support member, 7... Heat conductor, 8... Temperature sensing element.

Claims (1)

[Claims] 1. A temperature sensing element that detects the bottom temperature of the pot, a heat-resistant support member such as ceramics that holds this temperature sensing element,
A heat conductor with good thermal conductivity is provided to cover the upper part of the heat-resistant support member and include the temperature sensing element between the heat-resistant support member, and a heat-receiving member that contacts the heat conductor with the bottom of the pot. A temperature sensing device for a heating cooker, which is made of a spring material that is pressed via the heat-resistant support member to a contact plate provided with a cylinder that hangs down at the outer periphery.