JPH11201461A - Pot bottom sensor for internal flame type burner - Google Patents

Abstract

(57) [Summary] [Problem] When a pan bottom sensor is installed at the center of an annular internal flame type burner, it is not enough to surround the pan bottom sensor with a cylindrical heat shield cylinder that is opened up and down because the draft is not enough. Flows back into the heat shield cylinder, and the temperature detected by the pan bottom sensor becomes high. A heat collecting cap (32) in which an outer cylinder (36) is fitted to an inner cylinder (33) of a pan bottom sensor (3) and a thermistor (31) is attached.
Ring cap 37 so that the upper surface of
To form a substantially closed space between the inner cylinder 33 and the outer cylinder 36.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pan bottom sensor mounted at the center of an annular internal flame type burner.

[0002]

2. Description of the Related Art As a conventional pan-bottom sensor of this type, for example, Japanese Patent Laid-Open Publication 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. The heat is shielded by the protection cylinder, and the outside air by the draft is allowed to flow upward from below into the protection cylinder to cool the pan bottom sensor.

[0003]

In an external flame type burner in which a flame hole is formed on the outer peripheral surface, when the pan bottom sensor is surrounded by a heat shield cylinder, an outside air flow is generated in the heat shield cylinder by a draft, and the pan bottom sensor is sufficiently provided. Can be cooled. However, in the internal flame type burner, the flame is formed toward the protective cylinder, so that the draft does not occur 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.

Also, depending on disturbances such as blowing air into the burner and combustion conditions, hot air flows back from the upper opening of the heat shield cylinder into the heat shield cylinder and the temperature detected by the pan bottom sensor fluctuates to a higher temperature. Although the actual temperature is still low, the gas supply is stopped when the temperature detected by the pan bottom sensor abnormally changes to a high temperature.

Therefore, an object of the present invention is to solve the above problems.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to an upper end of a support pipe attached to the center of an annular internal flame type burner, which is urged upward and is vertically movable. The inner cylinder is provided with a temperature detecting element on the back surface of a heat collector formed at the upper end of the inner cylinder, and a pot bottom for an internal flame type burner for detecting the pot bottom temperature by pressing the upper surface of the heat collector to the pot bottom. The sensor is characterized in that the heat collecting part is exposed, the inner cylinder is surrounded, and a substantially closed space surrounding the inner cylinder is formed.

When hot air acts on the inner cylinder, the temperature detected by the pan bottom sensor rises abnormally, and the detected temperature fluctuates. When a substantially closed space surrounding the inner cylinder is formed, even if hot air tries to act on the inner cylinder due to disturbances or combustion conditions, the space is shielded from heat and heat is prevented from being transmitted from the hot air to the inner cylinder.

In order to form the space, specifically, a space is formed around the outer peripheral side wall of the inner cylinder by surrounding the outer peripheral side wall of the inner cylinder with the heat collecting portion exposed. An outer cylinder that substantially closes the upper and lower portions of the space may be attached. By the way, since the heat collector must be pressed against the bottom of the pot, it must be exposed. However, in consideration of the unevenness of the bottom of the pot, the upper surface of the heat collector needs to protrude. However, if the heat collecting portion protrudes significantly, a 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]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS.
This is a table stove provided with mouth stoves 2 and 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 internal flame type covered by a burner cover 18 are arranged on both stove sections 2.5 respectively. The pan bottom sensor 3 was disposed 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 tray 4
The outer flange 4d projecting outward from the upper end of the outer wall portion 4c is placed and held on the lower current plate 41 attached to the main body of the table stove 1. The pan bottom sensor 3 includes a support wall 14 formed by cutting a support pipe 34 of the pan bottom sensor 3 from the stay 13 attached to the main body.
Is fixed by being pressed by a clasp 15. Further, a metal (for example, stainless steel) heat shield cylinder 42 is attached to the stay 13 so as to hide the juice 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 plate thickness of the heat shield cylinder 42. From a pair of wings 4
2b 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 gap, and does not contact the inner flange 4a. By providing the gap in this manner, the lower current plate 41
Even if there is a dimensional error in the soup tray 4 or the like, the inner tray 4a protruding inward from the upper end of the heat shield portion 4b of the juice tray 4 does not contact the upper end portion 42a of the heat shield cylinder 42. Be sure to use the outer flange 4d provided on the outer periphery to
1, so that no gap is formed between the lower current plate 41 and the outer flange 4d. Therefore, air does not enter from a portion other than between the burner 20 and the outer periphery of the lower straightening plate 41 designed for air intake, and the combustion state is stabilized. By forming the inner flange 4a on the heat-shielding 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. This makes it difficult for the broth to penetrate into the heat-insulated space, and also allows the heat-insulated space and the heat shield cylinder 42 to be hidden 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, if there is no heat shield cylinder 42, when the burner 20 is ignited in a state where the removed juice tray 4 is not installed on the table stove 1,
There is a risk that the lead wires routed through the inside of 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 the state in which
Accordingly, the support pipe 34 is shielded from the heat and the hot air, and the burnout of the lead wire can be prevented.

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 so as not to extend straight upward but to extend 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 It is supported by the stove body without touching it. The top plate ring 12 and the burner cover 18
Has a heat-resistant enamel-like surface treatment. The top plate 11 is subjected to a water-repellent surface treatment such as a fluororesin so that dirt such as boiling water can be easily removed, but the fluororesin is not so strong against heat. 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 may be reduced by the weight of the cooking vessel placed on the
It is necessary to form a gap between the cover and the burner cover 18, but if such a gap is formed, flames or hot air enter 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, when the flame once gathers at the center and then spreads radially, it is possible to prevent the flame and the hot air from burning the top plate ring 12. . In addition, the flow of exhaust gas from the center of the burner in the radial direction becomes smooth, and the amount of generated carbon monoxide can be reduced. In particular, when lowering the virtues for flattening, the bottom of the cooking container placed on the 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.

The sensor 3 has a thermistor 31 inside as shown in FIG. The thermistor 31 is the inner cylinder 3
The heat collecting portion 3 is attached so as to be in close contact with the back surface of the heat collecting cap 32 fitted on the upper portion 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 portion, and the above-described support pipe 34, and 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 3
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 is closed, and the heat collecting cap 32
Is projected 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 collects heat. The cap 32 is prevented from reaching. Note that the heat collecting cap 32 as the heat collecting part is several mm (3 mm or less) from the ring cap 37 as the upper lid of the outer cylinder 36.
The protrusion is intended to ensure that the heat collecting cap 32, not the ring cap 37, is brought into contact with the bottom of the pot. That is, as described above, the flame or hot air from the burner 20 is discharged from the heat collecting cap 3.
2 so that the heat collecting cap 32
It is better not to project from the ring cap 37, but if the heat collecting cap 32 and the ring cap 37 are on the same surface, depending on the shape of the pot bottom (for example, a pot bottom which is concave upward like an enamel pot or the like), the heat collecting cap 32 May not reliably contact the bottom of the pot. 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.
A very small gap 38 between the ring cap 37 and the ring cap 37
Was formed. The hot air due to the flame from the burner 20 is
It is desirable not to form the gap 38 so as not to enter the space between the outer cylinder 36 and the outer cylinder 36. However, when the ring cap 37 is brought into contact with the heat collecting cap 32,
The heat of the outer cylinder 36 and the ring cap 37 exposed to the flame and the hot air is undesirably transmitted 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 equal pitches 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 to position the heat collecting cap 32 with respect to the ring cap 37. Is also good. In this case, since the heat collecting cap 32 and the ring cap 37 only make point contact via the tips of the protrusions, the amount of heat to be 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 swaged with respect to the lower part of the inner cylinder. If the air does not enter through the gap, it is assumed to be substantially closed.

The burner 20 is, as shown in FIG.
1 and the upper plate 23 are integrally spot-welded with the annular partition plate 22 therebetween. A plurality of deep and narrow grooves 21a are formed in the lower plate 21 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.
The lower side is closed by 2 to form a fire flame. The grooves 21a to be the main flame holes and the grooves 23a to be the fire flame holes are the same in number, and are formed with their phases shifted so as to be alternately located. The transfer flame holes formed by the grooves 23a are for assisting the transfer of fire between the main flame holes. Therefore, the flame formed in the transfer flame holes is short and has small heat. Therefore, even if the direction of the fire flame is directed toward the pan bottom sensor 3, the flame from the fire flame has little effect on the pan bottom sensor 3. 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, each groove 21a is 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. In addition, since the flames from the main flame holes do not collide with each other at the central portion, the exhaust is smoothly performed. However, if 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
At an angle of 25 °.

By the way, the main flame hole of the burner 50 to be 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 disposed 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 collide with 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 includes the partition plate 22 of the burner 20 in addition to the dedicated lower plate 51.
And the upper plate 23 is shared.

[0014]

As is apparent from the above description, the present invention forms a substantially closed space surrounding the inner cylinder, so that hot air does not directly act on the inner cylinder, and the temperature detected by the pan bottom sensor is higher than the high temperature side. And does not deviate significantly from the actual temperature in the pot.

[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 line II-II.

FIG. 3 is a partial sectional view of a pan bottom sensor.

FIG. 4 is a sectional view taken along line IV-IV.

FIG. 5 is a diagram showing the shape of a lower plate when there is no pan bottom sensor;

[Explanation of symbols]

 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

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kenji Imai 2-26, Fukuzumi-cho, Nakagawa-ku, Nagoya, Aichi Prefecture Inside Rinnai Corporation (72) Inventor Katsunori Tsukamoto 2-26, Fukuzumi-cho, Nakagawa-ku, Nagoya-shi, Aichi (72) Inventor Masahiro Yoshimura 3-24-9 Maruyama, Funabashi-shi, Chiba (72) Inventor Kohei Kobayashi 3-28-70-810 Minamisenju, Arakawa-ku, Tokyo

Claims (4)

[Claims] 1. An inner cylinder urged upward and vertically movably attached to an upper end of a support pipe attached to the center of an annular inner flame type burner is a collection formed at an upper end of the inner cylinder. In the pot bottom sensor for the internal flame type burner which has a temperature detecting element on the back surface of the heat section and presses the top face of the heat collecting section against the pot bottom to detect the pot bottom temperature, the inner cylinder is exposed in a state where the heat collecting section is exposed. A bottom sensor for an internal flame type burner, wherein a substantially closed space surrounding the inner cylinder is formed. 2. An outer cylinder surrounding the outer peripheral side wall of the inner cylinder in a state where the heat collecting portion is exposed, forming a space around the outer peripheral side wall of the inner cylinder, and substantially closing upper and lower parts of the space. The pan bottom sensor for an internal flame type burner according to claim 1, further comprising: 3. A pan bottom sensor for an internal flame type burner according to claim 1, wherein an upper surface of the heat collecting portion slightly protrudes. 4. An inner cylinder comprising an inner cylinder main body opening upward and a heat collecting cap for closing an 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 is provided with an inner cylinder main body. Between the main body of the outer cylinder and the main body of the outer cylinder, which has an opening through which the heat collecting cap is inserted and is fitted to the upper part of the main body of the outer cylinder. The pan bottom sensor for an internal flame type burner according to any one of claims 1 to 3, further comprising an outer cylinder comprising a ring cap for substantially closing the space.