JPH0335582B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement of a burner equipped with a burner body and a burner cap, and particularly relates to a burner for stoves equipped with a heat-sensitive element for flame detection.

[Prior Art] A burner for a table stove has a burner body in which a mixing chamber of combustion gas and primary air is formed, and a flat opening edge is formed on the upper surface of the burner body. In this burner body, a burner cap is placed on the opening edge through comb-like protrusions, and the gap between the protrusions is used as a flame hole array through which a mixed gas of air and fuel gas is discharged to the outside. It is said that

This burner monitors the presence or absence of a flame using a thermocouple as a heat-sensitive element.

During cooking, a predetermined output is maintained from the thermocouple and the main valve of the fuel gas source is kept open. Additionally, if the flame fails to ignite or is inadvertently extinguished, the thermocouple will not be able to maintain its output, so the main valve of the fuel gas source is closed to ensure safety.

[Problems to be solved by the invention] However, when cooking, it is common to adjust the firepower according to the boiling state, so when adjusting the firepower, the length of the flame changes and if it becomes short, There is a risk that the tip of the flame will separate from the thermocouple and the thermocouple will not be able to maintain a predetermined output due to insufficient heating, resulting in a malfunction in which the main valve will be closed inadvertently.

[Objective of the Invention] The present invention has been made in consideration of the above circumstances, and its object is to provide an excellent effect such that the heat-sensitive element will not malfunction even if the flame becomes short when adjusting the firepower. We provide filtration burners.

[Means for Solving the Problems] The present invention provides a burner body whose interior is a mixing chamber for primary air and fuel gas and whose upper surface has an opening edge formed around the entire circumference; a first recess formed to be recessed toward the mixing chamber; and a second recess corresponding to the first recess.
A burner cap is formed in which recesses are formed, and when installed on the burner body, these recesses match each other to accommodate a heat-sensitive element for flame detection. A row of tooth-shaped protrusions forming a flame hole row for discharging the mixed gas from the mixing chamber with the opening edge of the burner body, and a portion of the row of protrusions corresponding to the second recess are provided with the heat-sensitive It is equipped with four flame forming parts that are formed to produce small flames that sandwich the element from both sides and large flames that sandwich the small flames from the outside.When burning with medium or higher firepower, the heat-sensitive element is mainly The structure is such that when a small flame is burned, the large flame mainly heats the heat-sensitive element.

[Operations and Effects of the Invention] According to the present invention configured as described above, since both flame forming portions are provided so as to generate flames that sandwich the heat-sensitive element from at least both sides, even if the flame becomes short when adjusting the firepower, The heat-sensitive element receives sufficient radiant heat from both sides to maintain a predetermined output, and has excellent effects such as preventing the burner flame from being inadvertently extinguished.

[Example] The present invention will be described below based on an example shown in the drawings.

First, in FIG. 1, the burner 1 consists of a burner body 6 and a burner cap 7.
The central fitting cylinder part 6a and the outer annular body part 6b are formed concentrically with each other, and the fitting cylinder part 6a
A mixing chamber 6A is defined between the annular body portion 6b and the annular body portion 6b.
The upper surface of the burner body 6 is open, and the upper edge of the opening is an annular surface 63 that slopes downward toward the center. This annular surface 63 has a notch-like recess 62 and a recess 62a extending across the annular surface 63.
are formed adjacent to each other at an angular interval of approximately 60 degrees as the first recesses. These recesses 62 and recesses 62
A flat retracting annular surface 63a and a retracting annular surface 63b are formed so as to be continuous with the annular surface 63, respectively, from each inner end of the mixing chamber 6A. Further, the annular body 6b of the burner body 6
connects an L-shaped duct 6B communicating with the mixing chamber 6A at a portion diametrically opposed to the recess 62 (see FIG. 2).

On the other hand, the burner cap 7 is formed into a dish shape from a metal such as brass, and has a mounting cylinder part 72 that fits into the fitting cylinder part 6a of the burner body 6 in the center. Further, on the outer peripheral edge of the back side of the burner cap 7, a large number of protrusions 7A are provided radially around the circumferential edge at equal intervals except for the portions corresponding to the recesses 62 and the recesses 62a, and the overall shape is comb-like. . When the mounting cylinder part 72 is fitted into the fitting cylinder part 6a, these protrusions 7A come into contact with the annular surface 63 to form a flame hole array 13 that opens toward the outer circumference.

Now, in the part corresponding to the recesses 62, 62a of the burner cap 7, protrusion teeth 74, 75, 76 are provided, recessed slightly closer to the center than the protrusion 7A, and the front part thereof is provided in the second recess. 7a, and long teeth 7B, 7C are formed on both sides of the protruding teeth 74, 75, 76. Similarly, a protrusion tooth 74a that is retracted from the protrusion 7A is provided along the radial direction, and its front region is a recess 7b, and elongated teeth 7D and 7E are formed to sandwich the protrusion tooth 74a. There is. These elongated teeth 7D, 7E have protruding teeth 7F, 7G on the outside and inner ends thereof have protruding teeth 7D, 7E.
It extends to the inner edge of. As a result, even if the protruding teeth 7D and 7E are damaged, or the part corresponding to the tip of the burner body 6 is damaged, the flame opening passage remains long on the inside, so stable combustion can be achieved. . This also applies to the recess 7a, but the deeper recess 7b has greater significance.

In this state, the mutual spacing between the ridge teeth 74, 75, and 76 may be made slightly narrower than the spacing between the ridges 7A, or
While the facing flame forming portion is made shallow to reduce the amount of gas, the protrusion tooth 74, the elongated tooth 7C, and the protrusion tooth 7
The small flame forming portion P is formed by setting the intervals between the protrusions 6 and the elongated teeth 7B to be approximately equal to or have approximately the same depth as the interval between the protrusions 7A. At this time, in this embodiment, the gas amount between the protrusions 7A and 7A>long tooth 7
C, between ridge teeth 74 and long teeth 7B, ridge teeth 76
In addition to setting each gas amount between, the long tooth 7C,
Each amount of gas between the protruding teeth 74 and between the elongated teeth 7B and the protruding teeth 76 > the protruding teeth 74, 75 and the protruding teeth 7
The amount of each gas is determined to be between 5 and 76.

Further, a protrusion 7X is formed in the burner cap 7 at a position substantially corresponding to the recess 7a in the radial direction,
This protrusion 7X is connected to the annular surface 6 of the burner body 6.
This corresponds to the notch 6X provided on the inside of 3.

As the burner cap 7 is attached to the burner body 6, the projections 7X fit into the notches 6X to prevent rotation, and the protrusion teeth 74, 75, 76
2 and 3, the retracted annular surface 63a and the retracted annular surface 63
b, respectively. At the same time, the recess 7a of the burner cap 7 is replaced by the recess 6 of the burner body 6.
2, and the recess 7b matches the recess 62a.
The thermocouple 10 (thermal element) in the safety device 4 is housed in these recesses 7a, 62, and the recesses 7b, 62
A spark electrode 9 of an ignition device 3, which will be described later, is housed inside a.

Reference numeral 90 denotes a protection plate whose upper surface is a gentle spherical shape, which is formed to have a slightly larger diameter than the burner cap 7, and has a total of three recesses 91 formed at angular intervals of 120 degrees. Protrusion 92 provided with 91 as a spacer on the upper surface of burner cap 7
It is removably attached by fitting it into the. In this state, the outer peripheral edge of the protective plate 90 protrudes outward by about 3 mm from the outer peripheral edge of the burner cap 7, and integrally forms an eaves portion 93 that slightly protrudes toward the burner cap 7 side (the third (see figure). This eaves portion 93 has a tapered portion 93a that slopes downward toward the outside on the inner circumferential surface side, and faces the outer circumferential edge of the burner cap 7 with a slight gap therebetween.

A burner configured in this way is clearly
As shown in the figure, it is incorporated into a stove 100 of the present invention. In this stove 100, 2 is a gas supply system to the burner 1, 3 is an ignition device for the burner 1, 4 is a safety device, and 5 is a stove case in which these members are housed.

On the other hand, the mixing tube 8 is connected to the duct 6B, and an upstream end 81 serves as an introduction section for the fuel gas and primary air, and an intake port 82 for the primary air is provided on the end surface.

The gas supply system 2 includes a gas conduit 21, a valve 22, and a nozzle 23 whose tip is inserted into the mixing tube 8. The valve 22 is opened and closed by operating a knob 24, and the thermocouple 10 The open state can be maintained by the output.

The ignition device 3 includes a spark electrode 9, a high voltage generating means 32 consisting of a combination of a piezoelectric element and a striking mechanism for applying an impact to the piezoelectric element, or a combination of a dry battery and a high voltage pulse generating circuit; It consists of a lead wire 33 to be connected. This high voltage generating means 32 is normally operated by the knob 24, and in conjunction with the operation of opening the valve 22, a spark is generated at the spark electrode 9, thereby igniting the fuel gas.

The safety device 4 consists of a thermocouple 10 and an electromagnet (not shown) provided in the valve 22 so that the valve body of the valve 22 is maintained in an open state by the output of the thermocouple 10. When the temperature of the thermocouple 10 heated by the flame is higher than the set temperature, the valve 22 is kept open, and when the temperature of the thermocouple 10 falls below the set value due to extinguishing, etc., a spring (not shown) is released. As a result, the valve body operates in the valve closing direction.

Next, the operation of the stove 100 will be explained.

When the knob 24 is turned, the valve 22 opens, and gas is ejected from a nozzle 23 connected downstream of the valve 22. Air is sucked in from the primary air intake port 82 by the ejected flow of the gas by the action of the ejector, and is supplied into the mixing chamber 6A of the burner body 6 where the air is mixed in the mixing tube 8. Said knob 24
The ignition device 3 is activated in conjunction with the operation of the spark electrode 9 to generate a spark. This spark ignites the mixed gas of air and fuel gas ejected from the flame hole array 13 to the outer periphery to generate a flame and heat the cooking pot 12. As a result, secondary air flows into the mounting cylinder 7.
Since the air flows from inside 2 to the outside through between the protective plate 90 and the burner gap 7 as shown by the arrow in FIG. 3, the lack of air during combustion is compensated for.

At this time, in the recess 7a of the burner cap 7,
As shown in FIG.
The thermocouple 10 is located in a circumscribed state and maintains a good heating state for the thermocouple 10. On the other hand, both flame forming parts 7P
The flames F2 and F3 generated from the respective gaps are positioned so as to sandwich the thermocouple 10 closely on both sides even when the amount of gas is reduced by adjusting the firepower.

Also, when the amount of gas is reduced by adjusting the firepower, the flame
F0 and F1 become short as shown in Figure 8, and thermocouple 1
Since the flames F2 and F3 maintain the state in which the thermocouple 10 is sandwiched even when the flames F2 and F3 are separated from zero, the thermocouple 10 is kept in a good heating state due to the radiant heat from the flames F2 and F3. Therefore, during cooking, the thermocouple 10 can maintain a predetermined output regardless of whether or not the flame power is adjusted, and the valve 22 can be kept open, preventing the valve from being inadvertently closed and extinguishing the burner flame. This will prevent malfunctions.

In the case of this embodiment, the concave portion 7a is
5 and 76, so when the flames are narrowed down and the firepower is adjusted as in the flames F2 and F3 shown in FIG. The part that connects the tip M of the protrusion 74 is a part of the ejection port, and the mixed gas based on the flame F3 flows between the tip N of the protrusion 7B and the tip O of the protrusion tooth 76.
As a result, the flames F2 and F3 are tilted toward the thermocouple 10, and as a result, even when the gas amount is reduced to an extremely small amount, the thermocouple 10 effective outputs can be maintained.

In addition, since the protective plate 90 is provided on the upper part of the burner cap 7, even if boiled over spills from the cooking pot 12 to the outside, it will be caught on the protective plate 90, so that the thermocouple 10, spark electrode 9, secondary air There is no possibility that boiled boiled water or the like will fall on the inner circumference of the mounting cylinder part 72 through which the water passes. This prevents early deterioration of the thermocouple 10 and the spark electrode 9, and eliminates insufficient secondary air circulation and clogging of the flame hole.

Further, since the protective plate 90 is provided with the eaves portion 93, the following effects of the embodiment can be obtained.

In other words, spilled boiled water flowing down the protection plate 90 is removed from the eaves part 93 when it reaches the outer peripheral edge.
The water flows down to a drained state. For this reason, the dripping state of boiled water does not continue indefinitely,
Boiled spills fall off quickly.

Moreover, the protective plate 90 is attached to the burner cap 7.
Since the protective plate 90 is detachable from the boiling water, the protective plate 90 can be easily removed and washed with tap water after being soiled by spilled water.

Furthermore, as shown by the arrow in FIG. Exit to the top while being guided by. Such a flow of secondary air stabilizes the state of the flame from the flame hole array 13 and makes it difficult to lift, improving combustibility and, in turn, improving the heating state of the cooking pot 12.

In the above embodiment, the protection plate 90 was formed to have a larger diameter than the burner cap 7 and was set to protrude outward by about 3 mm, but the protrusion amount was 3 mm.
Of course, the dimensions are not limited to mm.

Further, in the above embodiment, the upper part of the second recess 7a in the burner cap 7 is cut out, but it goes without saying that the present invention can also be applied to a burner cap that does not have a cutout.

In addition, various changes may be made in the specific implementation without departing from the gist of the present invention.

[Brief explanation of the drawing]

1 to 8 show one embodiment of the present invention, FIG. 1 is an exploded perspective view of a burner cap and burner body, FIG. 2 is a schematic diagram of a stove, and FIG. 3 is a recess shown with a thermocouple. 4 is an assembly diagram of the burner, FIGS. 5 and 6 are front views of the burner cap from different directions, and FIGS. 7 and 8 are enlarged views of main parts shown for explanation of operation. FIG. In the diagram, 100...stove, 1...burner, 2...
... Gas supply system, 3 ... Ignition device, 4 ... Safety device, 6 ... Burner body, 7 ... Burner cap, 9 ... Spark electrode, 10 ... Thermocouple, 10
...flame hole row, 62, 62a...first recess, 7
a, 7b...second recess, 7P...both flame forming parts,
90...Protection plate.

Claims (1)

[Claims] 1. The interior is a mixing chamber for primary air and fuel gas,
a burner body having an opening edge formed around the entire circumference on its upper surface; a first recess formed at the opening edge of the burner body so as to be recessed toward the mixing chamber; and a second recess corresponding to the first recess. A burner cap is formed with recesses, and these recesses align with each other to accommodate a heat-sensitive element for flame detection when attached to the burner body; A row of tooth-shaped protrusions forming a row of flame holes for discharging the mixed gas from the mixing chamber with the opening edge of the burner body; It is equipped with four flame forming parts that are formed to produce small flames that sandwich the element from both sides and large flames that sandwich the small flames from the outside.When burning with medium or higher firepower, the heat-sensitive element is mainly used with small flames during combustion with medium or higher firepower. A burner for stoves that is characterized by heating a heat-sensitive element with a large flame when burning at a low power.