gas stove

Abstract

To suppress heating of a pot bottom temperature sensor 5 due to a flame even without providing a heat shielding cylinder surrounding the pot bottom temperature sensor 5, in a gas stove comprising: an annular internal flame type stove burner 3 arranged so as to face a burner opening 21 opened in a top plate 2, and having a flame port 31 on an inner periphery, and the pot bottom temperature sensor 5 that is in contact with a bottom surface of a cooking container P, and detects a temperature of the cooking container P.SOLUTION: An internal flame type stove burner 3 is composed of: an annular upper burner part 3U having a flame port 31 on an inner periphery; and an annular lower burner part 3L concentric with the upper burner part 3U and having, on an inner periphery, a flame port 31 located on a lower side of the upper burner part 3U. Preferably, a gap 32 is provided between the upper burner part 3U and the lower burner part 3L. In a state where both the upper burner part 3U and the lower burner part 3L perform combustion, thermal power of the lower burner part 3L is always made smaller than that of the upper burner part 3U.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a gas stove equipped with an annular inner flame stove burner with a flame nozzle on its inner periphery, which is positioned facing a burner opening in the top plate, and a pot bottom temperature sensor which protrudes above the top plate through the central space surrounded by the inner flame stove burner and abuts against the bottom of a cooking container heated by the inner flame stove burner to detect the temperature of the cooking container. [Background technology]

[0002] In this type of gas stove, the flame extending inward from the flame port of the internal flame stove burner heats the pot bottom temperature sensor, making it unable to accurately detect the temperature of the cooking vessel. Therefore, a heat insulating tube has been provided to surround the pot bottom temperature sensor, preventing the flame from heating the pot bottom temperature sensor (see, for example, Patent Documents 1 and 2).

[0003] To improve the heat insulation of the pot bottom temperature sensor, the top of the heat shield tube needs to be extended as far upward as possible. However, if a round-bottomed wok is used as the cooking vessel, the center of the pot bottom will rise up onto the top of the heat shield tube, compromising the stability of the pot. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 11-201455 [Patent Document 2] Japanese Patent Application Laid-Open No. 2008-215729 Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above, the present invention aims to provide a gas stove that suppresses heating of the pot bottom temperature sensor by flames and also ensures the stability of the pot when using a wok. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides a gas stove equipped with an annular inner flame stove burner with a flame nozzle on its inner periphery that is positioned facing a burner opening opened in the top plate, and a pot bottom temperature sensor that protrudes above the top plate through the central space surrounded by the inner flame stove burner and abuts against the bottom surface of a cooking container heated by the inner flame stove burner to detect the temperature of the cooking container, wherein the inner flame stove burner is characterized by being composed of an annular upper burner section with a flame nozzle on its inner periphery, and an annular lower burner section that is located below the upper burner section and is concentric with the upper burner section, with a flame nozzle on its inner periphery.

[0007] According to the present invention, combustion in the lower burner generates a draft airflow around the pot bottom temperature sensor, and this draft airflow makes it difficult for the flame from the upper burner to approach the pot bottom temperature sensor. As a result, heating of the pot bottom temperature sensor by the flame can be suppressed without providing a heat shield tube surrounding the pot bottom temperature sensor. Furthermore, because a heat shield tube is not required, even when using a wok, the center of the pot bottom will not ride up onto the top edge of the heat shield tube, ensuring the stability of the pot.

[0008] In addition, in the present invention, it is desirable to provide a gap between the upper burner section and the lower burner section. In this case, air flowing into the gap is drawn into the draft airflow generated by combustion in the lower burner section, widening the radial width of the draft airflow. As a result, the flame of the upper burner section can be effectively prevented from approaching the pot-bottom temperature sensor.

[0009] Furthermore, in the present invention, it is desirable to make the inner diameter of the lower burner section larger than that of the upper burner section, and to always make the heating power of the lower burner section smaller than that of the upper burner section when both the upper and lower burner sections are burning. This shifts the location where the draft airflow caused by combustion in the lower burner section outward in the radial direction, more effectively preventing the flame of the upper burner section from approaching the pot bottom temperature sensor. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a cross-sectional end view of a main part of a gas stove according to an embodiment of the present invention; [Figure 2] 10 is a line graph showing the heat power at each heat power adjustment stage of an inner flame type stove burner provided in the gas stove of the embodiment. [Figure 3] FIG. 10 is a cross-sectional end view of a main part of a gas stove according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] 1, a gas stove according to an embodiment of the present invention is equipped with an annular inner-flame stove burner 3 having a flame nozzle 31 on its inner periphery, which is disposed facing a burner opening 21 opened in a top plate 2 covering the top surface of the stove body 1. The inner-flame stove burner 3 is attached to a burner mounting base 11 fixed to the stove body 1. A trivet 4, which is formed by attaching a plurality of trivet claws 42 to an annular trivet frame 41, is disposed on the top plate 2 so as to surround the burner opening 21. A cooking vessel P, such as a pot, placed on the trivet 4 is heated by the inner-flame stove burner 3.

[0012] The gas stove also has a pot-bottom temperature sensor 5 that protrudes above the top plate 2 through the central space surrounded by the internal flame stove burner 3. The pot-bottom temperature sensor 5 is supported by a spring (not shown) biasing it upward at the upper end of a vertically long support pipe 51 that is attached to the burner mounting base 11 via a bracket 12. The temperature of the cooking vessel P is detected by the pot-bottom temperature sensor 5 abutting against the bottom of the cooking vessel P heated by the internal flame stove burner 3, i.e., the cooking vessel P placed on the trivet 4. The temperature detection signal from the pot-bottom temperature sensor 5 is input to a controller (not shown) via a lead wire 52 extending from the lower end of the support pipe 51.

[0013] A heat shield cylinder 6 is attached to the burner mounting base 11, surrounding the support pipe 51. A circular drip tray 7 is provided surrounding the lower part of the heat shield cylinder 6 and supported by a tray frame 71 attached to the underside of the lower burner section 3L (described later). The heat shield cylinder 6 does not extend high enough to surround the pot bottom temperature sensor 5. Therefore, even if a round-bottomed wok is placed on the trivet 4, the center of the pot bottom will not climb onto the top edge of the heat shield cylinder 6, thereby preventing the pot from becoming unstable. However, the flame extending inward from the flame port 31 of the internal flame-type stove burner 3 may heat the pot bottom temperature sensor 5, potentially preventing the pot bottom temperature sensor 5 from accurately detecting the temperature of the cooking vessel P.

[0014] Therefore, in this embodiment, the internal flame stove burner 3 is composed of an annular upper burner section 3U having a flame nozzle 31 on its inner periphery, and an annular lower burner section 3L located below the upper burner section 3U and concentric with the upper burner section 3U, also having a flame nozzle 31 on its inner periphery. The lower burner section 3L is attached to a burner mounting base 11. The upper burner section 3U is attached above the lower burner section 3L via a spacer (not shown), so that a gap 32 is provided between the upper burner section 3U and the lower burner section 3L in the area other than the spacer. A secondary air guide 33 is also attached above the upper burner section 3U via a spacer (not shown).

[0015] Gas is supplied separately to the upper burner section 3U and the lower burner section 3L. The heat power of the internal flame stove burner 3 can be adjusted in eight stages, from the minimum "1" to the maximum "8." At each heat power adjustment stage, the heat power of the upper burner section 3U changes as shown by line a in Figure 2, the heat power of the lower burner section 3L changes as shown by line b in the same figure, and the total heat power of the upper burner section 3U and the lower burner section 3L changes as shown by line c in the same figure. That is, at heat power adjustment stages "1" to "3," only the lower burner section 3L is burned, and at heat power adjustment stages "4" to "8," both the upper burner section 3U and the lower burner section 3L are burned, with the heat power of the lower burner section 3L being lower than that of the upper burner section 3U.

[0016] If the internal flame stove burner 3 is configured as described above with an upper burner section 3U and a lower burner section 3L, combustion in the lower burner section 3L generates a draft airflow around the pot bottom temperature sensor 5, as shown by arrow a in FIG. 1. This draft airflow prevents the flame F from the upper burner section 3U from approaching the pot bottom temperature sensor 5. As a result, heating of the pot bottom temperature sensor 5 by the flame F can be suppressed without providing a heat shield surrounding the pot bottom temperature sensor 5. Furthermore, air flowing into the gap 32 between the upper burner section 3U and the lower burner section 3L is drawn into the draft airflow generated by combustion in the lower burner section 3L, as shown by arrow b in FIG. 1, expanding the radial width of the draft airflow. As a result, the flame F from the upper burner section 3U can be effectively prevented from approaching the pot bottom temperature sensor 5. Furthermore, when both the upper burner section 3U and the lower burner section 3L are burning (heat adjustment stages "4" to "8"), the heat power of the lower burner section 3L is always made smaller than the heat power of the upper burner section 3U, which shifts the location where the draft airflow caused by combustion in the lower burner section 3L is generated radially outward, making it possible to more effectively prevent the flame of the upper burner section 3U from approaching the pot bottom temperature sensor 5.

[0017] In the above embodiment, the inner diameter of the lower burner section 3L is the same as the inner diameter of the upper burner section 3U, but the inner diameter DL of the lower burner section 3L may be larger than the inner diameter DU of the upper burner section 3U, as in the embodiment shown in Fig. 3. In this case, too, the location where the draft airflow caused by combustion in the lower burner section 3L is generated is shifted radially outward, thereby increasing the effect of preventing the flame F of the upper burner section 3U from approaching the pot-bottom temperature sensor 5.

[0018] Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited thereto. For example, in the above embodiment, a gap 32 is provided between the upper burner section 3U and the lower burner section 3L, but it is also possible to place the upper burner section 3U in close contact with the lower burner section 3L without providing this gap. [Explanation of symbols]

[0019] 2...top plate, 21...burner opening, 3...internal flame stove burner, 3U...upper burner section, 3L...lower burner section, 31...flame opening, 32...gap, 5...pot bottom temperature sensor, P...cooking container.

Claims

1. A gas stove equipped with an annular inner flame stove burner with a flame nozzle on the inner periphery, which is arranged facing a burner opening opened in the top plate, and a pot bottom temperature sensor that protrudes above the top plate through a central space surrounded by the inner flame stove burner and abuts against the bottom of a cooking container heated by the inner flame stove burner to detect the temperature of the cooking container, The pot bottom temperature sensor is supported by being biased upward on the upper end of a support pipe erected in the central space, The inner flame type stove burner is composed of an annular upper burner section having a flame port on the inner circumference, and an annular lower burner section concentric with the upper burner section, located below the upper burner section and having a flame port on the inner circumference. Furthermore, a heat-shielding tube having a diameter larger than that of the pot bottom temperature sensor is provided in the central space so as to surround the support pipe, and the upper end of this heat-shielding tube is located above the flame port of the upper burner section and below the upper surface of the top plate.

2. 2. The gas stove according to claim 1, wherein a gap is provided between the upper burner section and the lower burner section.

3. 3. The gas stove according to claim 2, wherein the inner diameter of the lower burner section is larger than the inner diameter of the upper burner section.

4. A gas stove as claimed in any one of claims 1 to 3, characterized in that when both the upper burner section and the lower burner section are burning, the heating power of the lower burner section is always made smaller than the heating power of the upper burner section.

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