JPH1122975A - Cooking stove burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To elongate distance between an outlet and a communication port and inhibiting reverse flow of exhaust gas so as to stabilize combustion state by providing a cylindrical body protruding downwards from a bottom end of an inner diameter part of a burner head in a burner cap having a central air path communicating with the inner diameter part of the burner head. SOLUTION: A burner comprises a burner body 1 having a mixing pipe 10 and an annular burner head 11 and a burner cap 2 placed on the burner head 11. A cylindrical body 7 is provided in such a manner as to protrude downwards from a bottom end of an inner diameter part of the burner head 11 of the burner. By this construction, exhaust gas sucked into a central air path 25 of the burner cap 2 flows out of a bottom end of the cylindrical body 7 into 11 interior of a body of a cooking stove. Even if a clearance is formed between a bottom-end outer-peripheral part of the inner diameter part of the burner head 11 and a deflector 63a of a baffle plate 63 due to tolerances, exhaust gas is prevented from taking a shortcut to the clearance. The cylindrical body 7 is formed in a length reaching a mounting part 60 of a mounting bracket for a pan bottom temperature sensor 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner burner having a burner body having an annular burner head, and a burner cap mounted on the burner head.

[0002]

2. Description of the Related Art Conventionally, as a stove burner of this type, a group of flame holes on the outer periphery are formed on a burner head by a burner cap, and gas is supplied to an internal combustion chamber and a gas in the internal combustion chamber on a part of the burner head in a circumferential direction. Forming an internal flame hole to blow out, opening a communication port in the burner head that communicates the internal combustion chamber to the lower space of the burner head, and allowing a flame sensor that controls a safety valve for the burner to face the internal combustion chamber through the communication port, It is known that gas from an internal flame hole is burned in an internal combustion chamber by supply of secondary air from a communication port, and the presence or absence of a flame in the internal combustion chamber is detected by a flame sensor, and a safety valve is closed when a misfire occurs. ing.

[0003] There are burner caps that cover the burner head over its inner diameter and those that have a central air passage communicating with the inner diameter of the burner head.

[0004] By the way, the area of air flowing into the interior of the stove, which is incorporated in the system kitchen, is smaller than that of a general table stove. Negative pressure may occur temporarily in the body. In this case, when the burner cap has the central air passage, the exhaust gas generated by the combustion is sucked into the central air passage, and the exhaust gas flows backward from the lower end of the inner diameter portion of the burner head to the internal combustion chamber through the communication port. The internal combustion chamber becomes oxygen-deficient. Then, a flame lift occurs, the flame sensor stops detecting the flame, the safety valve is closed, and the burner is extinguished.

In order to prevent such unnecessary fire extinguishing, Japanese Unexamined Patent Publication No. Hei 8-193719 discloses a flame sensor mounting bracket provided with a baffle plate for preventing backflow of exhaust gas to a communication port. However, due to the tolerance, the baffle plate cannot be in close contact with the outer periphery of the lower end of the inner diameter portion of the burner head, and exhaust gas may flow into the communication port from the lower end of the inner diameter portion through the gap between the baffle plate. there were.

[0006]

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to improve the reliability of preventing exhaust gas from flowing back into an internal combustion chamber at the beginning of ignition.

[0007]

Means for Solving the Problems In order to solve the above problems,
According to the present invention, a burner body having an annular burner head, and a burner cap mounted on the burner head are provided. Forming an internal combustion chamber and an internal flame hole for ejecting gas into the internal combustion chamber,
A burner head is provided with a communication port for communicating the internal combustion chamber to a space below the burner head, and a flame sensor for controlling a safety valve for the burner is exposed to the internal combustion chamber through the communication port. In forming a central air passage communicating with the inner diameter portion of the head, a cylindrical body projecting downward from the lower end of the inner diameter portion of the burner head is provided.

According to this, the outlet of the exhaust gas sucked into the central air passage of the burner cap into the stove at the initial stage of ignition is the lower end of the cylinder located below the lower end of the inner diameter portion of the burner head. Therefore, the distance between the outlet and the communication port becomes longer, and the backflow of the exhaust gas through the communication port to the internal combustion chamber is suppressed. Therefore, the combustion state in the internal combustion chamber is stabilized, and the flame sensor reliably detects the flame, thereby preventing unnecessary fire extinguishing.

[0009] In addition, some stove burners include a pot bottom temperature sensor that protrudes above the burner cap through the inner diameter portion of the burner head and the central air passage. In this case, a rod portion extending downward from the pot bottom temperature sensor is provided. The holder is mounted, and the holder is attached to the mounting bracket disposed below the burner head at the tongue portion bent to one side formed at the upper end of the holder. If it is inserted into the cylinder with the phase facing to the side and attached to the mounting bracket, the flow of exhaust gas to the portion near the communication port in the cylinder is suppressed by the tongue piece, and the communication port at the lower end of the cylinder is Can guide the exhaust gas such that the exhaust gas exits from the opposite side, and can effectively prevent the exhaust gas from flowing back into the internal combustion chamber.

The cylinder may be screwed to the lower end of the inner diameter portion of the burner head from below, but this requires a lot of assembly time. On the other hand, an inner bending flange is formed at the lower end of the inner diameter portion of the burner head, and an outer bending flange is formed at the upper end of the cylindrical body. Is preferably engaged with the inner bending flange, the cylinder can be easily assembled, which is advantageous. In this case, if the cylindrical body is divided on one side and the diameter can be reduced, and if the outer diameter of the cylindrical body in a free state is larger than the inner diameter of the inner bending flange, the cylindrical body is bent inward while the diameter is reduced. Fitted to the flange, the cylinder comes into close contact with the inner bending flange with the expanding force, and it can reliably prevent the exhaust gas from leaking from the lower end of the inner diameter part of the burner head, preventing the exhaust gas from flowing back into the internal combustion chamber. It is advantageous.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a stove burner incorporated in a system kitchen. This burner is used for mixing tube 1
0 and an annular burner head 11 at its front end (left end in FIG. 1)
And a burner cap 2 mounted on a burner head 11 and having an opening P formed in a top plate P mounted on a stove (not shown).
The upper part of the burner head 11 is projected above the top plate P through a.

The burner body 1 is made of sheet metal formed by hemming two press-formed upper and lower plate members 1a and 1b at the outer edge and the lower end of the inner diameter of the burner head 11, and is provided in the burner head 11 in the circumferential direction. And a plurality of outlets 13 communicating with the distribution chamber 12 are formed on the upper surface of the burner head 11, as shown in FIG.
Further, upper and lower plate members 1a,
1b are overlapped to form a flat portion 14, and the flat portion 1
4 has a communication opening 15.

A number of teeth protrude from an outer peripheral portion of a lower surface of the burner cap 2 except for a front portion located on the flat portion 14, and a burner hole on the outer periphery is formed on the burner head 11 by tooth grooves between the teeth. 20 groups are formed so that gas from the outlet 13 is ejected outward from these flame holes 20.
Further, a wall portion 21 located radially inward of the communication port 15 and a communication port 15 are provided on the front side of the lower surface of the burner cap 2.
Of the burner head 11 on the flat portion 14 of the burner head 11.
Is formed, and gas is blown into the internal combustion chamber 22 from an internal flame hole 23 formed by a groove of the wall 21.

The internal combustion chamber 22 communicates with the space below the burner head 11 through the communication port 15, and connects the flame sensor 3 such as a thermocouple or a frame rod for controlling a burner safety valve (not shown) to the communication port. Through 15, it faces the internal combustion chamber 22. An ignition target 24 located in the internal combustion chamber 22 is protruded from the lower surface of the burner cap 2, and an ignition plug 4 facing the target 24 is provided.
The gas in the internal combustion chamber 22 is ignited by spark discharge between the internal combustion chamber 22 and the target 24, and the air supplied from the communication port 15 is used as secondary air to perform combustion in the internal combustion chamber 22.
The gas erupting from 0 is ignited.

The burner cap 2 is further provided with a central air passage 25 communicating with the inner diameter of the burner head 11. Then, a pot bottom temperature sensor 5 is provided which protrudes above the burner cap 2 through the inner diameter portion of the burner head 11 and the central air passage 25, and a pot bottom is provided on the bottom of a cooking device B such as a pot placed on a stove A of a stove. The temperature of the cooker B can be detected by contacting the temperature sensor 5. On the upper surface of the burner cap 2, a heat shield ring 26 surrounding the pot bottom temperature sensor 5 and constituting the upper half of the central air passage 25 is provided in a protruding manner.

A mounting bracket 6 is arranged below the burner head 11, and a mounting portion 60 for the pan bottom temperature sensor 5 is cut and raised at a portion of the mounting bracket 6 located below the inner diameter of the burner head 11, In addition, pan bottom temperature sensor 5
The holder 51 having a two-member structure is mounted on the rod portion 50 extending downward from the mounting portion 60 at the tongue piece portion 51a formed at the upper end thereof and bent to one side. Screw from the pan bottom temperature sensor 5
Is attached to the mounting bracket 6.

A window hole 61 is formed on the front side of the mounting portion 60 of the mounting bracket 6, and the sub-bracket 62 is fixed to a portion of the mounting bracket 6 in front of the window hole 61. Is attached to the sub-bracket 62 in the window hole 61. And sub bracket 6
2, a baffle plate 63 having an insertion hole for the flame sensor 3 and the ignition plug 4 is fixed to a leg 63a formed on the baffle plate 63. The baffle plate 63 includes the flame sensor and the spark plug 4.
A vertical plate portion 63b located at the back of the arrangement portion and a cooling portion 63c bent rearward at the upper end thereof function as a partition between the space below the inner diameter portion of the burner head 11 and the communication port 15. I do.

In the case of a stove for a system kitchen, since the area of air flowing into the container from below is smaller than that of a general table stove, the air flowing into the container is restricted. The draft effect that promotes it is not obtained,
At the initial stage of ignition of the burner, the inside of the stove may be temporarily reduced to a negative pressure due to consumption of air due to combustion in the internal combustion chamber 22. Then, the exhaust gas generated by the combustion is sucked into the central air passage 25, and the exhaust gas tends to flow backward from the lower end of the inner diameter portion of the burner head 11 toward the communication port 15. In this case, if the cooling portion 63c of the baffle plate 63 is in close contact with the outer periphery of the lower end of the inner diameter portion of the burner head 11, the flow of exhaust gas toward the communication port 15 can be blocked. However, a gap is inevitably generated between the outer circumference of the lower end of the inner diameter portion of the burner head 11 and the closed portion 63c due to a tolerance. Exhaust gas flows from the gap to the communication port 15, and the internal combustion chamber 22 flows backward due to the backflow of the exhaust gas. As a result, the flame in the internal combustion chamber 22 is lifted and the flame sensor 3 does not detect the flame. As a result, the safety valve is closed and the burner is extinguished even if the fire has not been misfired.

Therefore, in this embodiment, the burner head 1
A cylindrical body 7 protruding downward from the lower end of the inner diameter portion 1 is provided. According to this, the exhaust gas sucked into the central air passage 25 flows out from the lower end of the cylindrical body 7 into the container of the cooking stove, and even if the above gap occurs, the exhaust gas does not flow into the gap in a short-circuit manner. Is done. Then, air in the internal space above the lower end of the cylinder 7 flows through the communication port 15 to the internal combustion chamber 2.
2, the combustion state in the internal combustion chamber 22 is kept good, the flame sensor 3 reliably detects the flame, and the unnecessary extinguishing of the burner by closing the safety valve is prevented. After the ignition, when the flame in the outer peripheral flame hole 20 is stabilized and the draft becomes effective, air flows outward from the inside of the container via the central air passage 25, and the exhaust gas is sucked into the central air passage 25. Disappears.

The cylindrical body 7 is formed so as to reach the mounting portion 60 for the pan bottom temperature sensor 5 of the mounting bracket 6, and the holder 51 of the pan bottom temperature sensor 5 is attached to the tongue piece 51 thereof.
a is inserted into the cylindrical body 7 and attached to the mounting portion 60 in such a phase as to face the opening of the communication port 15, that is, the front side. According to this, the flow of the exhaust gas along the front portion in the cylindrical body 7 is regulated by the tongue piece 51a, and the flow of the exhaust gas is guided to the rear side in the cylindrical body 7 and flows out from the lower end of the cylindrical body 7. It is possible to more reliably prevent the exhaust gas from flowing back to the communication port 15.

An outer bending flange 7 is provided at the upper end of the cylindrical body 7.
0 is formed. Then, the cylinder 7 is connected to the burner head 1.
The inner cylindrical portion 7 is inserted into the inner diameter portion of the burner head 11 from above, and the outer bending flange 70 is engaged with the inner bending flange 16 formed by the hemming portion at the lower end of the inner diameter portion of the burner head 11 to prevent the cylindrical body 7 from coming off. According to this, the cylinder 7 is connected to the burner head 1.
1 can be assembled simply by inserting it from above, so that the cylinder 7 can be easily assembled.

The cylindrical body 7 is formed with a first slit 71 extending over the entire length on one side and a second slit 72 on the other side with the upper part left uncut. Rising portions 6 on both sides of the mounting portion 60 of the bracket 6
4, 64 so that the cylinder 7 is prevented from rotating. The length of the rear portion 73 of the cylinder 7 is shortened so as not to interfere with the rear portion of the mounting bracket 6, but the lower end of the front portion 74 of the cylinder 7 is separated from the communication port 15 as much as possible. For this reason, the length is increased, and is projected below the mounting bracket 6 through the window hole 61.

The cylindrical body 7 is divided by a first slit 71 so that the diameter of the cylindrical body 7 can be reduced, and the outer diameter of the cylindrical body 7 in the free state is made larger than the inner diameter of the inner bending flange 16.
Are fitted to the inner bending flange 16 in a reduced diameter state. According to this, the cylindrical body 7 is securely brought into close contact with the inner bending flange 16 by the expanding force of the cylindrical body 7, and leakage of exhaust gas from the lower end of the inner diameter portion of the burner head 11 is prevented.

Although the burner with the pan bottom temperature sensor 5 has been described above, the present invention can be similarly applied to a burner without the pan bottom temperature sensor. Further, in the above embodiment, the flame sensor 3 and the ignition plug 4 face the internal combustion chamber 22 to ignite the burner in the internal combustion chamber 22.
The present invention can be similarly applied to a burner which is ignited by an ignition plug or an ignition burner in other parts.

[0025]

As is apparent from the above description, according to the present invention, the backflow of exhaust gas into the internal combustion chamber at the initial stage of ignition can be effectively suppressed, and the safety valve can be closed even though the burner has not been misfired. Problems can be resolved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one side of the burner of the present invention.

FIG. 2 is an exploded perspective view of the burner.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Burner body 11 Burner head 15 Communication port 16 Inner bending flange 2 Burner cap 20 Peripheral flame hole 22 Internal combustion chamber 23 Inner flame hole 25 Central air passage 3 Flame sensor 5 Pot bottom temperature sensor 50 Rod part 51 Holder 51a Tongue piece 6 Mounting bracket 7 Cylindrical body 70 Outer bending flange

Claims (4)

[Claims] 1. A burner body having an annular burner head, and a burner cap mounted on the burner head, wherein a group of outer peripheral flame holes are formed on the burner head by the burner cap, and a peripheral hole on the burner head is formed. Forming an internal combustion chamber and an internal flame hole for ejecting gas into the internal combustion chamber in a part of the direction,
A burner head is provided with a communication port that communicates the internal combustion chamber with the space below the burner head, and a flame sensor that controls a safety valve for the burner faces the internal combustion chamber through the communication port. An air burner, wherein a central air passage communicating with an inner diameter portion of the head is formed, and a cylindrical body protruding downward from a lower end of the inner diameter portion of the burner head is provided. 2. The stove burner according to claim 1, further comprising a pot bottom temperature sensor protruding above the burner cap through an inner diameter part of the burner head and a central air passage, and a rod part extending downward from the pot bottom temperature sensor. The holder is mounted on a mounting bracket disposed below the burner head, and the holder is attached to a tongue formed on the upper end of the holder and bent to one side. A burner that is inserted into the cylinder with the phase facing the side and attached to the mounting bracket. 3. An inner bending flange is formed at a lower end of an inner diameter portion of the burner head, and an outer bending flange is formed at an upper end of the cylindrical body. 3. The stove burner according to claim 1, wherein the flange is engaged with the inner bending flange. 4. The cylindrical body according to claim 3, wherein the cylindrical body is divided at one peripheral side so that the diameter can be reduced, and the outer diameter of the cylindrical body in a free state is larger than the inner diameter of the inner bending flange. Burner burner.