JPH08193719A - Stove burner - Google Patents

Abstract

PURPOSE: To prevent exhaust gas from flowing back into a sub-combustion chamber at the time of ignition to perform ignition smoothly by providing a block plate between a central air path and the sub-combustion chamber to prevent exhaust gas from entering the sub-combustion chamber. CONSTITUTION: A burner has a burner body 2 with an annular head 21 and an detachable annular burner top 3 that are mounted on the annular head 21. The insides of the annular head 21 and a cylindrical part 3A serve as a central air path 4 to supply secondary air and a heat shield cylinder 41 is attached on the upside of the burner top 3 concentrically with the central air path 4. A pan bottom temperature sensor 5 is provided in the central air path 4 to detect temperatures of a pan bottom A to be heated. Some of annular burner port rows 11 are arranged inside to form sub-burner ports and a sub-combustion chamber 12 is provided outside the sub-burner ports. A block plate 7 is provided between the central air path 4 and the sub-combustion chamber 12 to prevent exhaust gas from entering the sub-combustion chamber 12 when the exhaust gas flows back downward along the central air path 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the improvement of the ignitability at the time of ignition of a stove burner having a pan bottom temperature sensor.

[0002]

2. Description of the Related Art In a stove burner having a pan bottom temperature sensor, an annular burner top is detachably mounted on a burner body having an annular head, and an annular flame row is formed on the outer circumference. The central portion of the hob burner is a cylindrical central air passage, and a pot bottom temperature sensor consisting of six columns and a heat-sensitive cap elastically supported by the columns is erected on the axis of the air channel. . A heat shield tube is mounted on the upper surface of the burner top to prevent the flame from the annular flame port array from heating the heat-sensitive cap.

Further, since the ignition electrode of the ignition device, the thermocouple as a misfire (ignition) sensor, and the like are provided in a part of the annular flame nozzle array, the flame nozzle array is retracted toward the inner peripheral side and is arranged as a subordinate. It forms a flame mouth. A sub-chamber open to the outside is provided outside the sub-flame port, and the ignition electrode and the thermocouple are mounted in the sub-chamber. Therefore, on the outer peripheral portion of the lower surface of the burner top, there is provided a ring-shaped ridge having slits formed in a comb shape, and the ring-shaped ridge has a portion corresponding to the sub chamber receding toward the inner peripheral side, One is a recess, and the recess forms a space of the sub chamber.

On the upper surface of the annular head portion of the burner body, there is provided an annular installation surface with which the lower end surface of the annular projection abuts. By mounting the burner top on the burner body, an annular main flame port, An annular flame port array is formed by a small number of secondary flame ports facing the secondary chamber. The annular head portion of the burner body is formed with a communication port for forming the ignition part of the ignition electrode in the sub chamber and for inserting and mounting the temperature sensing part of the thermocouple from below.

[0005]

In this stove burner with a pan bottom temperature sensor, the combustion exhaust gas in the annular flame row immediately after ignition passes through the central air passage through the gap between the pan bottom and the upper end of the heat shield. It may flow backwards and enter the sub-chamber to cause oxygen deficiency. This is a peculiar phenomenon at the time of ignition that occurs because the ascending airflow in the central air passage is weak immediately after ignition. This oxygen deficiency lifts the flame at the sub-flame port, the thermocouple as a misfire sensor cannot be heated smoothly, and the electromotive force of the thermocouple closes the safety valve that keeps the valve open. was there.

An object of the present invention is to provide a stove burner which can prevent the inflow of exhaust gas or the like from the central air passage into the sub-chamber during ignition and can smoothly perform the ignition operation. The object of the invention described in claims 2 and 3 is
(EN) It is possible to provide a stove burner which can prevent the backflow of exhaust gas from the central air passage from entering the sub chamber with a simple structure.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to a burner body having an annular head portion, an annular burner top detachably mounted on the annular head portion to form an annular flame port array on the outer periphery, and the annular member. A central air passage formed in the head portion and the central portion of the annular burner top, a heat shield tube coaxially mounted above the central air passage, and standing upright at the center of the central air passage and the heat shield cylinder. And a pan bottom temperature sensor that is provided outside the auxiliary flame port that is a part of the flame port array arranged on the inner peripheral side,
A stove burner having a communication opening communicating below the annular head portion and a sub-chamber facing the communication opening and equipped with an ignition device or a misfire sensor, wherein the central air passage and the sub-chamber are connected. In addition, a shielding member for preventing the exhaust gas flowing back through the central air passage from entering the sub chamber is provided.

In the hob burner according to a second aspect of the present invention, the shielding member is a partition plate extending downward from a lower end of the central air passage. The stove burner according to claim 3, wherein the partition plate is made of one sheet metal,
It is characterized in that it has a return plate portion that is inclined toward the central air passage side. The stove burner according to a fourth aspect is characterized in that the lower end of the partition plate extends below the lower end of the annular head portion.

[0009]

In the stove burner of the present invention, the shielding member prevents the combustion exhaust gas flowing back through the central air passage immediately after ignition from entering the sub chamber. Therefore, it is possible to prevent the flame from the secondary flame port from lifting due to oxygen deficiency immediately after ignition and causing heating failure of the thermocouple. As a result, the safety valve does not close immediately after ignition, and the ignition operation can be performed smoothly. With the configurations described in claims 2 to 4, it is possible to prevent the combustion exhaust gas flowing back from the central air passage from entering the sub chamber with a simple structure.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A stove burner according to the present invention will be described with reference to FIGS. The stove burner 1 is made of sheet metal and has an annular head 2.
1 and a forged annular burner top 3 which is detachably mounted on the annular head 21.
The burner top 3 is composed of a tubular portion 3A fitted inside the annular head portion 21 and an umbrella portion 3B extending from the upper end of the tubular portion 3A to the outer periphery and covering the annular head portion 21.

The insides of the annular head portion 21 and the tubular portion 3A have a cylindrical shape and serve as a central air passage 4 for supplying secondary air for combustion. A cylindrical heat shield tube 41 is coaxially attached to the central air passage 4 by three legs 42 on the upper surface of the burner top 3. An annular gap 43 is provided between the heat shield cylinder 41 and the upper surface of the burner top 3 for letting out a part of the air rising in the central air passage 4 as secondary air for combustion along the upper surface of the burner top 3. Is provided. At the center of the central air passage 4, a pan bottom temperature sensor 5 for the pan bottom A, which is the food to be cooked, is concentrically provided.

The pan bottom temperature sensor 5 has a small-diameter support cylinder 51 and a support cylinder 5 inserted into a holder H mounted on a bracket 50 horizontally arranged below the annular head 21.
1, a medium-diameter barrel 52 attached to the upper end, and a heat-sensitive cap 54 attached to the upper end of the barrel 52 and elastically supported by a spring 53. Thermal cap 5
4, a temperature sensor 55 is attached to the lead wire 56.
Is drawn downward through the body cylinder 52 and the support cylinder 51.

An annular flame port array 1 mainly composed of an annular main flame port on the outer peripheral side by joining the burner body 2 and the burner top 3
1 is formed, a part of the ring-shaped flame port array 11 is disposed deeply on the inner peripheral side to form a secondary flame port, and a secondary chamber 12 is provided outside thereof. The thermocouple 13 (see FIG. 3) as a misfire (ignition) sensor and the ignition electrode 14 of the ignition device are inserted into the holder H attached to the bracket 50 so as to face the sub chamber 12. Above the bracket 50, a flame prevention plate 6 for partitioning a space below the communication port 20 described later from another space below the burner body 2 is attached. In addition, by providing the sub chamber 12 as described above,
The reason why the ignition electrode 14 and the thermocouple 13 are arranged so as to face the sub-chamber 12 is to prevent the simmered liquid from dropping and adhering on the ignition electrode 14 and the thermocouple 13 to cause a malfunction.

As shown in FIG. 3, the burner body 2 is formed by stacking an upper plate and a lower plate, which are formed by press-molding a metal plate punched into a predetermined shape, and caulking or spot-welding the outer peripheral flange portion 2A. It is manufactured by joining the inner circumference 2B of the portion 21 by tightening. In the present embodiment, the outer peripheral flange portion 2A is the lowermost end of the annular head portion 21. A mixing pipe portion 22 extends from the lower part of the annular head portion 21 toward the outer circumference in the radial direction, and the tip of the mixing pipe portion 22 serves as a supply port for fuel gas and primary air for combustion. .

The annular head portion 21 has an upper internal space which serves as a passage for a mixture of fuel gas and primary air, and a lower portion which has a cylindrical skirt portion 2S. On the upper surface of the annular head portion 21, a plurality of air outlets 24 are formed in an annular shape on the inner periphery, and on the outer periphery, an annular installation surface 25 for mounting the annular protrusion 31 of the burner top 3 is provided in an inverted conical surface shape. ing. Ring head 2
In FIG. 1, a recess 26 in which a part of the annular head portion 21 is crushed in the vertical direction to form a flat portion at a portion opposite to the extending direction of the mixing pipe portion 22 and a communication port 20 with the lower portion is opened is provided. Are formed. The recess 26 forms a lower space of the sub chamber 12. In this embodiment, the communication port 20 has a fan shape,
The flat portion is formed to be inclined slightly downward.

The ignition electrode 14 is erected upright so as to face the communication port 20, the tip is set lower than the communication port 20, and a spark discharge gap is formed between the ignition electrode 14 and the ground electrode 30 projectingly provided on the lower surface of the burner top 3. Is forming. The thermocouple 13 is erected in parallel with the ignition electrode 14 in a state where the upper end portion, which is a temperature sensitive portion, projects from the communication port 20 into the upper sub chamber 12. Thermocouple 1
3 and the ignition electrode 14 are connected to the coated lead wire,
These coated lead wires are connected to an electric device (not shown). It should be noted that the tip of the ignition electrode 14 may pass through the communication port 20 and may be arranged at a higher position.

The burner top 3 is provided with an annular projection 31 around the lower surface of the umbrella portion 3B. A portion of the annular ridge 31 corresponding to the sub chamber 12 is retracted inward and a recess 32 is formed outside thereof to form an upper space of the sub chamber 12. The annular protrusion 31 has a plurality of comb teeth 33 arranged in a radial direction, and a slit row having a predetermined depth is provided between the comb teeth 33. When the burner top 3 is placed on the burner body 2, the lower surface of the ring-shaped protrusion 31 composed of the comb teeth 33, 33 contacts the ring-shaped installation surface 25, and the slit row is composed of a ring-shaped main crater. The nozzle array 11 is formed. A small number of slits facing the sub chamber 12 in the annular flame port array 11 are ignited by the ignition electrode 14 to form a sub flame port 15 for heating the thermocouple 13.

Long comb teeth 34, 34 for partitioning the recess 32 are formed on the lower surface of the umbrella portion 3B. This long comb tooth 3
4, 34 are step walls 2 between the annular installation surface 25 and the recess 26.
It is sandwiched between 8 and 28 to form a positioning mechanism for determining the proper mounting position of the burner top 3 with respect to the burner body 2.

The flame prevention plate 6 is a substantially notched circular bottom plate which is horizontally arranged below the communication port 20 with an inner peripheral wall 27 of the skirt portion 2S of the annular head 21 with a gap G of about 1 mm. 61, radial side wall plates 6 erected on both sides of the bottom plate 61
2, 63, an inner wall plate 65 in the chord direction, and an eaves plate portion 66 formed by bending the upper end of the inner wall plate 65 toward the center side which is the central air passage 4 side. The flame prevention plate 6 is fixed in the burner body 2 below the communication port 20 with its leg pieces 67 and 68 sandwiched between the outer peripheral flange portion 2A of the annular head 21 and the bracket 50. A flameproof section 60 that surrounds the bottom is formed.

In this flameproof section 60, when the burner top 3 is set incorrectly, the flame from the auxiliary flame port 15 is formed below through the communication port 20, and the ignition electrode 14 and the thermocouple 13 are formed.
To prevent damage to the wiring part of
It is a section shielded by the flame prevention plate 6 and communicates downward with only the gap G. The gap G is provided to supply secondary combustion air to the auxiliary flame port 15 from below.

Reference numeral 7 is a shielding member provided between the central air passage 4 and the sub chamber 12, and prevents exhaust gas that flows backward through the central air passage 4 from entering the sub chamber 12. In this embodiment, as shown in FIG. 4, the shielding member 7 is composed of one press-formed metal partition plate, and is provided with an upper plate portion 71 provided so as to overlap the inner wall plate 65, and the upper plate portion 71. Of the return plate portion 72 extending from the lower end of the return plate portion to the center side and a lower plate portion 73 extending further downward from the return plate portion 72. The shielding member 7 is integrated by spot welding the upper plate portion 71 to the inner wall plate 65 of the flame prevention plate 6. The lower end of the lower plate portion 73 is configured to protrude below the outer peripheral flange portion 2A, which is the lowermost end of the annular head portion 21.

Next, the operation of the shielding member 7 will be described. When an ignition operation is performed during use of the stove, a spark discharge is generated at the ignition electrode 14, and the air-fuel mixture ejected from the auxiliary flame port 15 is ignited, and the flame is transferred to the entire annular flame port array 11 mainly composed of the main flame port. Then it is burned. The thermocouple 13 is heated by the flame of the auxiliary flame port 15 to raise the temperature, and the electromotive force keeps the electromagnetic safety valve open to continue normal combustion. Secondary air for combustion is supplied to the main crater of the annular flame nozzle array 11 from the outer circumference and the inner circumference of the flame. The secondary air for combustion from the inner circumference flows along the upper surface of the burner top 3 through the annular gap 43 in a part of the rising air flow of the central air passage 4, and is supplied above the main crater of the annular flame nozzle row 11. To be done.

At the initial stage of ignition, the burner body 2
Also, since the temperature of the burner components such as the burner top 3 is low, there is no rising air flow in the central air passage 4, and conversely, part of the flame exhaust from the annular flame port array 11 causes a gap between the pan bottom and the upper end of the heat shield tube 41. From the inside to the inside of the heat shield tube 41, and flows backward through the central air passage 4 to the lower side of the stove burner 1. This backflowed exhaust gas, together with the secondary air for combustion from the gap G to the secondary flame port 15, enters the secondary chamber 12 through the flameproof compartment 60 and the communication port 20, and is supplied to the flame of the secondary flame port 15. The oxygen concentration of the secondary air for combustion is reduced. Therefore, the flame of the auxiliary flame port 15 lifts, heating of the thermocouple 13 becomes insufficient, and the output of the thermocouple 13 decreases. As a result, the same state as that of misfire occurs and the safety valve malfunctions and closes, and the ignition state cannot be maintained.

The shielding member 7 prevents the exhaust gas flowing back through the central air passage 4 from entering the sub chamber 12. Therefore, the invasion of exhaust gas into the sub chamber 12 can be prevented, and the sub flame port 15
The flame lift can be prevented. As a result, there is no malfunction of the safety valve, and it is possible to smoothly shift from ignition to the ignition maintaining state.
In particular, since the descending exhaust flow is deflected toward the center side of the central air passage 4 by the return plate portion 72, the effect of preventing the exhaust gas from entering the sub chamber 12 is great. Further, since the lower end of the lower plate portion 73 projects downward from the outer peripheral flange portion 2A, the deflected descending exhaust flow is reliably prevented from staying in the annular head portion 21, and the exhaust gas into the sub chamber 12 is exhausted. Has a large effect of preventing intrusion.

Although the shielding member 7 is not limited to the shape of the above-mentioned embodiment, it is necessary that the lower portion of the burner body 2 is opened to smoothly raise the secondary air for combustion, and
It is desirable that this part be as compact as possible because there are various equipment installations, wiring, and piping in this part. In this embodiment, with a compact and simple structure, it is possible to prevent the exhaust gas that has flowed backward through the central air passage 4 from entering the sub chamber 12.

Although the flame prevention plate 6 is provided in the above embodiment, the function and effect of the present invention can be achieved even if only the shielding member 7 is used. Further, the present invention can be applied to a case where a flame rod is used as a misfire sensor instead of the thermocouple 13 and a case where a temperature resistance element is used. In addition, sub-chamber 1
Even when only the ignition electrode 14 is attached to the ignition device 2, the ignitability can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a stove burner.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a perspective view of a burner body and a burner top.

FIG. 4 is a perspective view of a flame prevention plate and a shielding member.

[Explanation of symbols]

 1 stove burner 2 burner body 3 burner top 4 central air passage 5 pan bottom temperature sensor 6 flame preventive plate 7 shielding member 11 annular flame port array 12 sub-chamber 13 thermocouple (misfire sensor) 14 ignition electrode (igniter) 20 communication port 21 annular head of burner body 27 inner peripheral wall

Claims (4)

[Claims] 1. A burner body having an annular head portion, an annular burner top detachably mounted on the annular head portion to form an annular flame port array on the outer periphery, and the annular head portion and the annular burner top portion. A central air passage formed in the central portion, a heat shield tube coaxially mounted above the central air passage, a pan bottom temperature sensor erected at the center of the central air passage and the heat shield cylinder, and an inner circumference. Is provided on the outside of the auxiliary flame port that is a part of the flame port array disposed on the side, has a communication port that communicates with the lower part of the annular head, and faces the communication port, the ignition device or the misfire sensor. In a stove burner equipped with a sub-chamber equipped with, a shielding member is provided between the central air passage and the sub-chamber to prevent exhaust gas flowing back through the central air passage from entering the sub-chamber. A stove burner characterized by that. 2. The stove burner according to claim 1, wherein the shielding member is a partition plate extending downward from a lower end of the central air passage. 3. The stove burner according to claim 2, wherein the partition plate is made of one sheet metal and has a return plate portion inclined toward the central air passage. 4. A stovetop burner according to claim 2, wherein a lower end of the partition plate extends below a lower end of the annular head portion.