JP3542485B2 - Pot bottom sensor for internal flame type burner - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pan bottom sensor mounted on the center of an annular internal flame type burner.
[0002]
[Prior art]
As a conventional pan-bottom sensor of this type, for example, Japanese Patent Application Laid-Open No. Sho 62-210330 discloses a pan-bottom sensor in which a pan-bottom sensor is attached to the center of an annular internal flame type burner. In this device, since the flame of the internal flame type burner is formed toward the pan bottom sensor, the pan bottom sensor is extended from below so that the flame or hot air does not act on the pan bottom sensor. It is configured such that heat is shielded by the protection cylinder, and outside air due to the draft is allowed to flow upward from below into the protection cylinder to cool the pan bottom sensor.
[0003]
[Problems to be solved by the invention]
In the external flame type burner in which the flame hole is formed on the outer peripheral surface, when the pan bottom sensor is surrounded by the heat shield cylinder, an outside air flow is generated in the heat shield cylinder by draft, and the pan bottom sensor can be sufficiently cooled. However, in the internal flame type burner, the flame is formed toward the protection cylinder, so that draft is not generated as much as in the external flame type burner due to the influence of the combustion pressure and the like. Therefore, the temperature detected by the pan bottom sensor greatly deviates from the actual temperature in the pan to the high temperature side.
[0004]
Also, depending on disturbances such as blowing air into the burner and combustion conditions, hot air may flow back from the upper opening of the heat shield cylinder into the heat shield cylinder, causing the temperature detected by the pan bottom sensor to fluctuate to the high temperature side. Although the temperature is still low, the gas supply is stopped when the temperature detected by the pan bottom sensor abnormally changes to a high temperature.
[0005]
Then, this invention makes it a subject to solve the said problem.
[0006]
[Means for Solving the Problems]
The present invention in order to solve the above problems, the upper end of the support pipe which is attached to the center of the inner flame burner ring is urged upwardly, and vertically movable inner cylinder mounted in said inner cylinder A heat-detecting element is provided on the back surface of the heat-collecting section formed at the upper end, and the heat-collecting section is exposed in a pot-bottom sensor for an internal flame type burner that detects the pot bottom temperature by pressing the top of the heat-collecting section against the pot bottom. In this state, a space is formed around the outer peripheral side wall of the inner cylinder so as to surround the outer peripheral side wall of the inner cylinder, and an outer cylinder that substantially closes upper and lower portions of the space is provided .
[0007]
When hot air acts on the inner cylinder, the detected temperature of the pan bottom sensor rises abnormally and the detected temperature fluctuates, but when a substantially closed space surrounding the inner cylinder is formed, hot air tries to act on the inner cylinder due to disturbance or combustion conditions. This also shields the space from heat and prevents heat from being transferred from the hot air to the inner cylinder.
[0008]
To form the space, thereby forming a space around the peripheral side wall of the inner cylinder Specifically surrounds the peripheral side wall of the inner cylinder while exposing the heat collector, the upper portion of the space and the outer cylinder is mounted to substantially close the bottom. By the way, since the heat collecting portion must be pressed against the bottom of the pot, it must be exposed. However, considering the unevenness of the bottom of the pot, the upper surface of the heat collecting portion needs to protrude. However, if the heat collecting portion protrudes significantly, the flame or hot air acts on the side surface of the heat collecting portion, and the heat collecting portion is heated. Therefore, it is desirable that the heat collecting portion is slightly projected. Further, the space does not need to be completely airtightly closed, and may be substantially closed so that hot air does not enter the space.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Referring to FIGS. 1 and 2, reference numeral 1 denotes a table stove provided with two stove portions 2.5. Gotoku 10 is placed on the top plate 11. In addition, a top plate ring 12 is provided in the openings of the two stove portions 2 and 5. Below the top plate 11, burners 20 and 50 of an end flame type covered by a burner cover 18 are arranged in both stove sections 2.5. The pan bottom sensor 3 was provided only on the left-hand stove portion 2 of both stove portions 2 and 5. The pan bottom sensor 3 is located at the center of the burner 20, and is laterally surrounded by the heat shield 4 b of the juice tray 4. The juice receiving tray 4 has an outer flange 4d protruding outward from the upper end of the outer wall portion 4c placed and held on a lower rectifying plate 41 attached to the main body of the table stove 1. The pan bottom sensor 3 is fixed to a support wall 14 formed by cutting a support pipe 34 of the pan bottom sensor 3 from a stay 13 attached to the main body by a clasp 15. Further, a metal (for example, stainless steel) heat shield cylinder 42 is attached to the stay 13 so as to be hidden inside the juice receiving tray 4 around the support wall 14. More specifically, the screwed portion 16 is cut and raised on both sides of the support wall 14 with a gap slightly wider than the thickness of the heat shield cylinder 42. A pair of wings 42b is formed. Then, the lower end of the heat shield cylinder 42 is inserted into the gap, and the screw part 16 and the wing part 42b are screwed to each other to fix the heat shield cylinder 42. The upper end portion 42a of the heat shield cylinder 42 is opposed to the inner flange 4a of the juice receiving tray 4 from below with a small clearance, and does not contact the inner flange 4a. By providing such a gap, even if there is a dimensional error in the lower rectifying plate 41, the juice receiving tray 4, etc., the inner flange 4a projecting inward from the upper end of the heat shielding portion 4b of the juice receiving tray 4 is Without contacting the upper end portion 42a, the juice receiving tray 4 is always placed on the lower current plate 41 by the outer flange 4d provided on the outer periphery, so that a gap is formed between the lower current plate 41 and the outer flange 4d. Does not occur. Therefore, air does not enter from a portion other than, for example, between the burner 20 and the outer periphery of the lower current plate 41 designed for air intake, and the combustion state is stabilized. By forming the inner flange 4a on the heat-insulating portion 4b of the juice receiving tray 4 as described above, a wide heat-insulating space is secured between the heat-insulating portion 4b and the heat-insulating cylinder 42, and the upper part of the heat-insulating space is narrowed. By doing so, it becomes difficult for the broth to penetrate into the heat-insulated space, and it is possible to hide the heat-insulated space 42 and the heat-insulated cylinder 42 from the outside. The juice tray 4 is mounted on the table stove 1 by being placed on the lower current plate 41 as described above, so that it can be easily removed from the table stove 1 and cleaned. However, when the burner 20 is ignited in a state in which the detached juice receiving tray 4 is not installed on the table stove 1 without the heat shield cylinder 42, there is a possibility that the lead wires routed through the support pipe 34 may be burned out. However, in the present embodiment, since the fixed heat shield cylinder 42 is provided, even if the burner 20 is ignited in a state in which the juice receiving tray 42 is forgotten, the support pipe 34 causes a flame or the like due to the heat shield cylinder 42. It is shielded from hot air and can prevent burnout of the lead wire.
[0010]
A burner cover 18 that covers the burner 20 with a gap is attached above the burner 20. The inner diameter of the burner cover 18 is formed to be slightly smaller than the inner diameter of the burner 20. An inclined portion 18b is formed above the narrowest portion 18a, not extending straight upward but extending outward at a predetermined angle. An inclined portion 12a is formed on the inner peripheral portion of the top plate ring 12 to be inclined downward toward the inside. The inclined portion 12a is received by the inclined portion 18b, so that the top plate ring 12 is It is supported by the stove body without touching it. The top plate ring 12 and the burner cover 18 are subjected to heat-resistant surface treatment such as enamel. The top plate 11 is subjected to a water-repellent surface treatment with a material such as a fluororesin so that dirt such as boiling water can be easily removed. Even if the top plate ring 12 and the burner cover 18 are heated to a high temperature, the top plate ring 12 is not in contact with the top plate 11, so that the fluororesin does not deteriorate due to heat. If the top plate ring 12 is supported by the top plate 11, the position of the top plate 11 and the burner cover 18 may be reduced in consideration of the fact that the position of the top plate 11 is lowered due to the weight of the cooking container placed on the gotoku 10. It is necessary to form a gap between them, but if such a gap is formed, a flame or hot air enters into the gap, which is not desirable. By the way, since the inclined portion 12a is formed in the inner peripheral portion of the top plate ring 12, it is possible to prevent the flame and the hot air from burning the top plate ring 12 when the flame once gathers at the center and then spreads radially. . Further, the flow of exhaust gas from the central part of the burner in the radial direction becomes smooth, and the amount of generated carbon monoxide can be reduced. In particular, when lowering virtues for flattening, the bottom of the cooking container placed on virtues is close to the top plate 11, but since the inclined portion 18b is formed on the burner cover 18 as described above, The top plate ring 12 is not burned, and the exhaust flow is smooth.
[0011]
As shown in FIG. 3, the sensor 3 includes a thermistor 31 inside. The thermistor 31 is attached as a heat collecting portion of the inner cylinder 33 so as to be in close contact with the back surface of the heat collecting cap 32 fitted on the upper part of the inner cylinder main body 33a. Further, a coil spring 35 is contracted between the heat collecting cap 32, which is a heat collecting part, and the above-described support pipe 34. When a pot (not shown) is placed on the gode 10, heat is collected on the bottom of the pot. The cap 32 abuts, and the inner cylinder 33 is pushed down by the pot bottom against the urging force of the coil spring 35. Incidentally, an outer cylinder 36 is fitted to the inner cylinder 33. The outer cylinder 36 is formed in such a size that a space can be formed between the outer cylinder 36 and the outer peripheral side wall of the inner cylinder 33. The outer cylinder 36 has an annular ring cap 37 fitted on the upper end of an outer cylinder main body 36a. The space formed between the outer cylinder 36 and the outer cylinder 36 on the outer peripheral side of the inner cylinder 33 is closed, and the heat collecting cap 32 projects from the upper surface of the ring cap 37 by several mm (3 mm or less). Therefore, when the heat collecting cap 32 is pressed against the pot bottom by the urging force of the coil spring 35, only a small gap of about several mm is formed between the pot bottom and the ring cap, and the flame or hot air from the burner 20 is discharged. It is prevented from reaching the heat collecting cap 32. The reason why the heat collecting cap 32 as the heat collecting portion is projected several mm (3 mm or less) from the ring cap 37 as the upper lid of the outer cylinder 36 is that the heat collecting cap 32, not the ring cap 37, is securely brought into contact with the bottom of the pot. It is to make it. That is, as described above, in order to prevent the flame and the hot air from the burner 20 from reaching the heat collecting cap 32, it is better that the heat collecting cap 32 does not protrude from the ring cap 37. If the cap 37 is on the same surface, depending on the shape of the pot bottom (for example, a pot bottom that is concave upward like an enamel pot or the like), there is a possibility that the heat collecting cap 32 does not reliably contact the pot bottom. Further, even if a small gap is provided as described above, the flame and the hot air do not reach the heat collecting cap. By the way, in the one shown in FIG. 3, an extremely narrow gap 38 was formed between the heat collecting cap 32 and the ring cap 37. In order to prevent hot air generated by the flame from the burner 20 from entering the space between the inner cylinder 33 and the outer cylinder 36, it is desirable not to form the gap 38. However, when the ring cap 37 is brought into contact with the heat collecting cap 32, heat of the outer cylinder 36 and the ring cap 37 exposed to the flame and the hot air is undesirably conducted to the heat collecting cap 32. Therefore, a gap 38 is formed so that hot air does not enter the space between the inner cylinder 33 and the outer cylinder 36 and heat is not conducted from the ring cap 37 to the heat collecting cap 32. In addition, minute projections are provided at an equal pitch on the periphery of a hole formed in the center of the ring cap 37, and the projections are brought into contact with the heat collecting cap 32 so that the heat collecting cap 32 is positioned with respect to the ring cap 37. Is also good. In that case, since the heat collecting cap 32 and the ring cap 37 only make point contact via the tips of the projections, the amount of heat conducted does not increase to a problem. Further, the inner cylinder 33 and the outer cylinder 36 are in contact with each other by caulking at the lower end portion. However, since the inner cylinder 33 and the outer cylinder 36 are apart from the mounting position of the thermistor 31, even if heat is conducted from the outer cylinder 37 to the inner cylinder 33, there is a problem. There is no. In closing the space between the outer peripheral side wall of the inner cylinder 33 and the outer cylinder 36 below, the lower part of the outer cylinder was caulked with respect to the lower part of the inner cylinder. If the air does not enter through the gap, it is almost closed.
[0012]
As shown in FIG. 4, the burner 20 is formed by integrally spot welding a lower plate 21 and an upper plate 23 with an annular partition plate 22 interposed therebetween. In the lower plate 21, a plurality of deep and narrow grooves 21a are formed at an equal pitch. The upper side of the groove 21a is closed by the partition plate 22 to become a main flame hole. On the other hand, a groove 23a, which is shallower and wider than the groove 21a, is formed in the upper plate 23, and the lower side is similarly closed by the partition plate 22 to form a fire flame hole. The number of the grooves 21a to be the main flame holes and the number of the grooves 23a to be the fire flame holes are the same, and are formed so as to be alternately positioned with a phase shift. The transfer flame holes formed by the grooves 23a are for assisting the transfer of fire between the main flame holes. Therefore, the flames formed in the transfer flame holes are short and have small thermal power. Therefore, even if the direction of the fire transfer flame hole is toward the pan bottom sensor 3, the influence of the flame from the fire transfer flame hole on the pan bottom sensor 3 is little. On the other hand, since the flame from the main flame hole is large and long, the flame from the main flame hole heats the pan bottom sensor 3 when the main flame hole faces the pan bottom sensor 3, which is not desirable. Therefore, all the grooves 21a are formed at an angle of 25 ° in the same direction with respect to the diameter line. When the groove 21a is formed to be inclined in this manner, the flame from the main flame hole does not go to the pan bottom sensor 3. Further, since the flames from the main flame holes do not collide with each other at the central portion, the exhaust is smoothly performed. However, when the inclination angle of the groove 21a is increased, the flame from the main flame hole is further away from the pan bottom sensor 3, but the area where the flame contacts the pan bottom is reduced, and the heat efficiency as a stove is undesirably reduced. Therefore, in the present embodiment, the groove 21a is inclined by 25 °.
[0013]
By the way, the main flame hole of the burner 50 attached to the other stove portion 5 does not need to be inclined to avoid the pan bottom sensor because the pan bottom sensor is not provided at the center of the burner 50. However, as described above, if the main flame holes are inclined, the flame from each of the main flame holes does not hit the central portion of the burner 50, and the exhaust is smoothly performed. Therefore, as shown in FIG. 5, the groove 51a formed in the lower plate 51 of the burner 50 is inclined by 15 ° with respect to the diameter line. In order to form the burner 50, a partition plate and an upper plate are required, but may be the same as the burner 20 except for the inclination angle of the main flame hole. Therefore, the burner 50 is formed by sharing the partition plate 22 and the upper plate 23 of the burner 20 in addition to the dedicated lower plate 51.
[0014]
【The invention's effect】
As is clear from the above description, in the present invention, since a substantially closed space surrounding the inner cylinder is formed, hot air does not directly act on the inner cylinder, and the detection temperature of the pan bottom sensor fluctuates to a high temperature side or Does not depart significantly from the actual temperature inside.
[Brief description of the drawings]
FIG. 1 is an external view of a table stove provided with an internal flame type burner. FIG. 2 is a sectional view taken along a line II-II. FIG. 3 is a partial sectional view of a pot bottom sensor. FIG. 4 is a sectional view taken along a line IV-IV. Diagram showing the shape of the lower plate when there is no sensor
DESCRIPTION OF SYMBOLS 1 Table stove 2 Stove part 3 Pot bottom sensor 4 Juice tray 5 Stove part 20 Burner 21 Lower plate 22 Partition plate 23 Upper plate 42 Heat shield cylinder 32 Heat collecting cap 33 Inner cylinder 36 Outer cylinder 37 Ring cap 50 Burner

Claims (3)

The upper end of the support pipe which is attached to the center of the inner flame burner ring is urged upwardly, and vertically movable inner cylinder mounted, the temperature on the back surface of the heat collector which is formed on the upper end of the inner cylinder In the pot bottom sensor for the internal flame type burner which has a detecting element and presses the upper surface of the heat collecting section to the pot bottom to detect the pot bottom temperature, the outer side wall of the inner cylinder is surrounded with the heat collecting section exposed. A pot bottom sensor for an internal flame type burner, comprising: a space formed around an outer peripheral side wall of an inner cylinder; and an outer cylinder substantially closing an upper part and a lower part of the space. Pan bottom sensor for inner flame burner of claim 1 Symbol placing the upper surface of the heat collector is characterized in that slightly protrude. It has an inner cylinder composed of an inner cylinder main body that opens upward and a heat collecting cap that closes the upper part of the inner cylinder main body, and is fitted and held at a lower end portion of the inner cylinder main body, and has an An outer cylinder main body that forms an open space, and an opening through which the heat collecting cap is inserted is fitted to an upper portion of the outer cylinder main body, and substantially closes a space between the inner cylinder main body and the outer cylinder main body. The pan bottom sensor for an internal flame type burner according to claim 1 or 2, further comprising an outer cylinder comprising a ring cap that performs heating.

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