JP2828164B2 - Cooker burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in the ignitability of a burner burner.

[0002]

2. Description of the Related Art A stove burner has a structure in which a substantially umbrella-shaped burner cap is removably mounted on a burner body having an annular head, and an annular flame port array is formed on the outer periphery. In the middle of the annular flame array, a sub-chamber having a window opened outward is provided in order to dispose an ignition plug of an ignition device, a thermocouple as a misfire detection sensor, and the like. On the outer peripheral portion of the lower surface of the burner cap, an annular ridge having a comb-shaped slit is provided around, and a portion corresponding to the sub-chamber of the annular ridge is a recess, and the recess is The upper space of the sub chamber is formed.

[0003] The burner body has an annular installation surface with which the lower end surface of the annular ridge abuts. When a burner cap is mounted on the burner body, the ignition facing the annular flame port array and the sub chamber is performed. And a misfire detection flame outlet. The annular head of the burner body is provided with a recess for forming a lower space of the sub chamber. At the bottom of the recess, there is formed a communication port for forming the ignition portion of the ignition plug in the sub-chamber and for inserting and mounting the temperature sensing portion of the thermocouple from below.

[0004] Since the sub-chamber has a window opened to the outside, ignition may not be performed smoothly when air is blown from the outside. In order to prevent poor ignition due to external disturbance, it is effective to set the ignition position below the communication port. In this case, it is necessary to guide the air-fuel mixture blown out from the ignition flame port downward from the communication port. Since the proportion of the ignition flame that contributes to the heating of the object to be cooked is small, it is desirable that the ignition flame be as small as possible. In addition, the stove burner is installed at a position slightly shifted in the rotation direction from the regular position due to variations in dimensional accuracy at the time of manufacturing the burner cap and an allowable gap when the burner cap is installed in the burner body,
In some cases, the position of the spark discharge position and the position of the ignition flame port are shifted.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the influence of external disturbances and to facilitate the ignition of an ignition flame in a sub-chamber and to minimize the ignition flame. An object of the present invention is to provide a stove burner capable of effectively preventing overheating below the sub-chamber due to a fire. The object of the invention described in claim 2 is that the spark discharge position can be concentrated in a certain range,
It is an object of the present invention to provide a stove burner capable of accurately forming a discharge spark at a position of a jet of an air-fuel mixture jetted from an ignition flame.

A third object of the present invention is to provide a stove burner which can easily ignite even if the ignition position is shifted due to tolerances in manufacturing dimensions of the burner cap and the burner body. An object of the invention described in claim 4 is to provide a stove burner capable of forming a thin and wide jet of an air-fuel mixture ejected from an ignition flame outlet, and obtaining an ignition flame having a high ignitability and a low thermal power. is there.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a burner burner having a burner body having an annular head and a burner cap mounted on the annular head to form an annular array of flame ports.
A part of the annular flame port row is provided with a sub-chamber having a flame port for ignition and a flame port for detecting misfire on the back wall, a communication port downwardly formed at the bottom, and a window opened outward. At the same time, an ignition plug and a misfire detection sensor are erected below the sub chamber facing the communication port, and a spark discharge gap is formed between the upper end of the electrode of the ignition plug and a ground electrode provided on the ceiling of the sub chamber. In the stove burner, the ground electrode is formed by a radial ridge provided on a lower surface of the burner cap.
It has a deflecting surface for deflecting the air-fuel mixture blown out from the ignition flame downward, and an ignition surface for spark discharge close to the level of the communication port on the outside and below the deflecting surface. And

According to a second aspect of the present invention, the ignition surface is a projection projecting from a lower end surface of a tip end of the ridge. In the configuration of claim 3, the protrusion is:
It has two heads with a burner cap radial groove in the middle. In the configuration of claim 4, the ignition flame port is formed at the base of the ridge,
The flat flame outlet is substantially the same width as the ridge and has a height equal to or less than １ ／ of the width.

[0009]

Operation and effect of the present invention
The following actions and effects are exhibited. 1) Since spark discharge is generated below the communication port, ignition errors due to disturbances outside the burner can be reduced. 2) An inclined surface (deflection surface) is provided on the projection for the ground electrode, and an air-fuel mixture ejected from an ignition flame provided on the back wall of the sub chamber is deflected by the inclined surface and flows into the spark discharge gap, so that ignition occurs. High in nature.

According to the second aspect of the present invention, since the projection is formed on the lower end surface of the ridge as a firing surface, the spark discharge can be concentrated on the projection. Thereby, it is possible to prevent the contact between the air-fuel mixture blown out from the ignition flame and the discharge spark from becoming unstable due to the variation of the spark discharge position, thereby improving the ignitability. According to the configuration of the third aspect, ignition can be easily performed even if the ignition position is shifted in the rotation direction due to the tolerance of the manufacturing dimensions of the burner cap and the burner body. According to the configuration of the fourth aspect, the air-fuel mixture is blown out from the flat ignition flame port, so that the contact between the discharge spark and the air-fuel mixture can be ensured, the ignition flame of low thermal power can be formed, and the overheating below the communication port is prevented. it can.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1-4, a stove burner 1 according to the present invention comprises a burner body 2 made of sheet metal and having an annular head 21. FIG.
And a burner cap 3 which is forged and has an umbrella shape and is detachably mounted on the annular head 21. An annular flame port array 11 is formed on the outer periphery of the joint surface between the burner body 2 and the burner cap 3, and a sub chamber 4 is provided in a part of the annular flame port array 11. A thermocouple 13 serving as a misfire detection sensor and a spark plug 1 of an ignition device
4 are mounted vertically.

As shown in FIGS. 4 and 5, the burner body 2 is formed by laminating an upper plate and a lower plate obtained by press-forming a metal plate punched into a predetermined shape, and caulking or spot welding or caulking the outer peripheral flange portion 2A. It is manufactured by processing and joining the inner circumference 2B of the annular head 21 by winding.
A mixing pipe portion 22 extends in the radial direction from the outside of the lower portion of the annular head portion 21, and a tip of the mixing pipe portion 22 is a supply port 23 for the fuel gas and the primary air. The upper part of the annular head 21 is a passage for a mixture of fuel gas and primary air, and the lower part is a cylindrical skirt 2S. On the upper surface of the annular head 21, an air outlet 24 is formed in an annular shape on the inner periphery, and an annular installation surface 25 of the burner body 2 is provided on the outer periphery in an inverted conical shape.

In the annular head 21, a part of the annular head 21 is crushed up and down into a flat portion H at a portion opposite to the direction in which the mixing pipe portion 22 extends, and a communication port 20 with the lower portion is formed. Is formed in the recess 26. The recess 26 forms a lower space of the sub-chamber 4. In this example,
The communication port 20 has a fan-shaped planar shape, and the flat portion H
Is formed to be slightly inclined outward and formed at the same level as the upper surface of the annular head 21 and serves as the bottom of the sub chamber 4. The flat portion H is a missing portion of the annular installation surface 25, and the installation surface 27 of the burner body 2 corresponding to the sub chamber 4 is an inner edge of the communication port 20.

The spark plug 14 is erected to face the communication port 20, and has a spark discharge gap G between the spark plug 14 and the ground electrode 5 whose tip is set lower than the communication port 20 and protrudes from the lower surface of the burner cap 3. Is formed. The thermocouple 13 is erected in parallel with the ignition plug 14 with an upper end portion, which is a temperature sensing portion, protruding from the communication port 20 into the sub-chamber 4. Insulated leads 41 and 42 are connected to the thermocouple 13 and the ignition plug 14, and these insulated leads 41 and 42 are connected to an electric device (not shown).

As shown in FIG. 6, the burner cap 3 is provided with an annular ridge 31 around the outer periphery of the lower surface. A portion of the annular ridge 31 corresponding to the sub-chamber 4 is a recess 32, and forms an upper space of the sub-chamber 4. Annular ridge 31
Has comb teeth 33 arranged in a radial direction, and the comb teeth 33,
A slit row having a predetermined depth is provided between the slits 33. When the burner cap 3 is placed on the burner body 2, the lower surface of the annular ridge 31 abuts on the annular installation surface 25, and the slit rows form the annular flame port row 11.

A small number of slit groups facing the sub-chamber 4 sandwich the ignition flame 15 ignited by the ignition plug 14, the auxiliary ignition flame 16, and the thermocouple 13 together with the installation surface 27. Misfire detecting ports 17 and 17 for forming a flame for heating from both sides of the heat sensitive section, and a small misfire detecting small port provided between the misfire detecting flame ports 17 and 17 and directed to the heat sensitive section of the thermocouple 13. A flame port 18 is formed. Auxiliary ignition flame 16 and misfire detection flame 1 sandwiching ignition flame 15
The flame 7 has a flame holding action for stabilizing the ignition flame generated in the ignition flame 15. Similarly, misfire detection small flame outlet 1
The flames generated in the misfire detection flame ports 17 sandwiching the flame 8 have a flame holding action for stabilizing the misfire detection flame generated in the misfire detection small flame port 18.

An annular ridge 3 is provided on the lower surface of the burner cap 3.
Long comb teeth 34, 34 are formed to separate the recess 1 from the recess 32. The long comb teeth 34, 34
It is sandwiched between the step walls 28, 28 between the recess 5 and the recess 26, and serves as a positioning mechanism for determining a proper mounting position of the burner cap 3 with respect to the burner body 2. In this embodiment, an opening 36 with a heat shield cylinder 35 is formed at the center of the burner cap 3, and a pot bottom temperature sensor 37 for the object to be cooked is provided upright.

A mounting stay 43 for attaching the thermocouple 13 and the ignition plug 14 is fastened below the burner body 2, and the thermocouple 13 and the ignition plug 14 are mounted on the stay 43 via mounting leaf springs 44, 44. ing. Above the mounting stay 43, a flame prevention plate 6 for partitioning the lower part of the communication port 20 from the space below the other burner body 2 is mounted.

The ground electrode 5 is formed by a radial ridge 50 provided at the position of the ignition flame 15 and has the same width as the ignition flame 15. The ridge 50 is
It comprises a flame outlet ceiling portion 51 for restricting the height of the ignition flame 15 to a low level, and an electrode portion 52 bulging downward on the outside thereof.
An inclined surface (deflection surface) 53 for deflecting the air-fuel mixture downward is formed between the flame outlet ceiling portion 51 and the electrode portion 52. The flame 15 for ignition has a flat cross-sectional shape with a height of 0.5 mm and a width of 3.0 mm, and the air-fuel mixture blown out also becomes a flat airflow.

The lower surface of the electrode portion 52 is set at substantially the same level (at the same level) as the upper surface of the flat portion H at a radially intermediate position of the communication port 20, and has a substantially hemispherical shape forming a firing surface at the tip. A projection 54 is provided. The projection 54 is provided with the spark plug 1
4 and a spark discharge gap G is formed between the spark discharge gap G and the tip 19 of the center electrode. As a result, the spark discharge gap G
Is located below the communication port 20. In addition, flame outlet ceiling 5
A groove 55 for increasing the length of the inclined surface 53 is formed between 1 and the inclined surface 53. The mixed gas flow blown out from the ignition flame 15 is deflected downward along the inclined surface 53 and flows out to the spark discharge gap G.

Next, the state in the sub chamber 4 when the burner 1 is ignited and when it is burned will be described. At the time of ignition, a mixture of fuel gas and primary air is supplied to the stove burner 1 and blows out from all the flame openings, and a spark discharge occurs in the spark discharge gap G. The air-fuel mixture ejected from the ignition flame 15 is:
The light is deflected downward by the inclined surface 53, guided to the spark discharge gap G, and ignited in contact with the discharge spark. The flame kernel generated by the ignition grows by the flame propagation and reaches the ignition of the mixed gas. As a result, an ignited ignition flame is generated, and the flame is transferred to the left and right ignition auxiliary flame ports 16 and misfire detection flame ports 17, and further to the misfire detection auxiliary flame ports 18 and misfire detection flame ports 17 of the sleeve. Next, the fire is burned to the annular flame row.

At this time, since the ignition flame 15 has a flat section with a large width and a low height, the ignition flame 15
The mixture flow blown out of the air is wide and has a high probability of contacting the discharge spark and being ignited. Further, since the ignition flame 15 is flat, the heat of the ignition flame can be set small. As a result, the thermocouple 1 is caused by the flame blown downward from the communication port.
The trouble that the middle part and lower part of 3 overheat can be prevented. The flatness of the ignition flame 15 is such that the height is 高 of the width.
It is necessary to be less than the following, and it is desirable to set it to 1/4.

In this burner burner, the spark discharge position is set below the communication port 20, and the air-fuel mixture ejected from the ignition flame is less affected by external disturbance below the sub-chamber 4. Since the ignition is performed below the communication port 20, the ignition is reliably performed and the flame kernel generated by the ignition can grow smoothly. As a result, the ignitability is improved. In addition, since the flame for ignition is located at the base of the ground electrode 5, the object to be cooked overflows, and even if the flame of the row of annular flames is misfired, the water overflows into the sub chamber from the outside. Misfire of the ignition flame can be prevented. For this reason, misfire resistance due to overflow is high.

FIG. 7 shows another embodiment. In this embodiment, the protrusion provided at the tip of the ground electrode 5 is composed of two protrusions 57, 57 arranged side by side with the intermediate groove 56 interposed therebetween. These are the long comb teeth 34, 3 provided on the lower surface of the burner cap 3.
4 and the step walls 28, 28 of the burner body have a play within a tolerance range at the time of manufacture, so that even if the burner cap 3 is set on the burner body 2, the projection 54
It can be difficult to set exactly right above. In this case, by providing two projections 57, it is possible to reliably generate a spark discharge at an appropriate position at any position.

[Brief description of the 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 an enlarged cross-sectional view of the stove burner at a mounting position of a thermocouple.

FIG. 4 is an assembly diagram of a burner body and a burner cap.

FIG. 5 is a plan view of a burner body.

FIG. 6 is a bottom view of the burner cap.

FIG. 7 is an assembly view of a burner body and a burner cap according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Burner burner 2 Burner body 3 Burner cap 4 Subchamber 5 Ground electrode 11 Annular flame row 13 Thermocouple 14 Spark plug 15 Flame port for ignition 17 Flame port for misfire detection 20 Communication port 21 Annular head of burner body 31, 50 ridge 53 inclined surface (deflection surface) 54 projection (ignition surface) 55 groove 57 projection G spark discharge gap

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masanori Inoma 2-26 Fukuzumi-cho, Nakagawa-ku, Nagoya Inside Linhai Co., Ltd. (58) Field surveyed (Int.Cl. ⁶ , DB name) F23D 14/06 F23D 14/26 F23Q 9/00

Claims (4)

(57) [Claims] 1. A stove burner in which a burner cap is placed on an annular head of a burner body having an annular head to form a ring of flame ports, The back wall has an ignition port and a misfire detection port, a lower communication port is formed at the bottom, a sub-chamber having a window opened to the outside is provided, and the sub chamber facing the communication port is provided. In a stove burner in which a spark plug and a misfire detection sensor are erected below the chamber and a spark discharge gap is formed between the upper end of the electrode of the spark plug and a ground electrode provided on the ceiling of the sub-chamber, the ground electrode is It is formed by a radial ridge provided on the lower surface of the burner cap, and the ridge has a deflecting surface for deflecting the air-fuel mixture blown out from the ignition flame downward in the inner side, and the deflecting surface on the outer side. Ignition of spark discharge closer to the level of the communication port below Stove burner characterized by having a. 2. The burner according to claim 1, wherein the ignition surface is a projection protruding from a lower end surface of a tip of the ridge. 3. The burner according to claim 2, wherein the protrusion has two heads having a burner cap radial groove therebetween. 4. The method according to claim 2, wherein
The burner is characterized in that the ignition flame port is formed at the base of the ridge and is a flat flame port having substantially the same width as the ridge and having a height equal to or less than １ ／ of the width.