JPH04214107A - Gas burner - Google Patents

Abstract

PURPOSE:To provide a gas burner installed on a portable burner and made of cast iron which withstands a prolonged use and the replacement of which is not required. CONSTITUTION:A gas burner 1 consists of a cylindrical section 60, a hollow cast iron burner body 6 which is connected to the upper end of said cylindrical section and, at the same time, has an open annular section the width of which is enlarged downwards at the position where the burner body 6 is opposed to the cylindrical section and which is provided with an open circular ring- shaped head section 61, and a burner cap 7 that is mounted on the head section of the burner body 6 and, at the same time, closes the upper end opening and forms outer circumferential rear flame row on the outer circumferential face of the connection with the burner body 6.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates primarily to gas burners for use in gas stoves, and particularly to improving the durability of gas burners.

0002

2. Description of the Related Art A gas burner conventionally used in a gas stove includes a burner body having an open upper end and a continuous closed annular head, and a burner cap placed on the head of the burner body to close the upper opening. It has an outer burner port on the outer periphery and a central burner port on the inner periphery.

0003

[Problem to be solved by the invention] Gas burners for stoves are mainly manufactured by casting and then machining from the viewpoint of manufacturing cost, but they become brittle over time and can only be used for about 5 years at most. was only possible. The inventor believes that the main cause of such deterioration in strength over time is that the head is in a closed annular shape, and this annular portion is repeatedly subjected to thermal stress due to the temperature difference between when it is in use and when it is not in use.
It was discovered that this problem lies in the structure of the cast iron burner head itself, which has a closed annular head. This invention was made based on the above knowledge, and aims to provide a gas burner for a stove that can withstand redundant long-term use and eliminates the need for replacement.

0004

[Means for Solving the Problems] A gas burner of the present invention includes a body portion and an open ring portion that extends downwardly in width and is connected to the upper end of the body portion and is opposite to the body portion. , a hollow cast iron burner body having an open annular head with an open upper end; and a burner cap forming a rear row of peripheral flames.

[0005]

Effects of the Invention In the gas burner of the present invention, since the head of the burner body has an open ring shape, the thermal stress generated in the head of the burner body due to the temperature difference between when it is in use and when it is not in use can be reduced. In particular, by providing the ring-opening portion at a position facing the body and having a structure in which the width increases downward, the following effects can be achieved. b) Because the burner body is symmetrical, uneven thermal expansion is less likely to occur. b) Compared to the width of the ring opening at the upper part of the burner body head where the temperature is high and the thermal expansion is large, the width of the ring opening at the lower part of the burner head where the temperature is relatively low and the thermal expansion is small. When the burner is used, thermal deformation is easier than when the width is uniform on the top and bottom, and the thermal stress generated inside is correspondingly reduced. As a result, the strength of the cast iron burner body is less likely to deteriorate and its durability can be improved.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained based on embodiments shown in the drawings. 100 indicates a gas stove, and the gas burner 1 of the present invention
, a gas supply system 2 to the gas burner 1, an ignition device 3, a safety device 4, and a stove case 5. gas burner 1
has a body part 60 and an open ring part 62 which is connected to the upper end of the body part and whose width increases downward in a position facing the body part, and has an open annular head part 61 whose upper end is open. a hollow cast iron burner body 6 comprising a hollow cast iron burner body 6; an annular umbrella part 71 placed on the head 61 of the burner body and closing the upper end opening 63; and a ring-shaped umbrella part 71 projecting downward from the center of the umbrella part 71. and a burner cap 7 having cylindrical legs 72 that are fitted into the head 61. Also Burnabody 6
The mixing tube 8 is connected to the lower end opening 64 of the body 60 of the holder.

The umbrella part 71 of the burner cap that closes the upper part of the ring-opening part 62 of the burner body serves as a ceiling 73 of the ring-opening part 62, and the lower surface of the burner cap of the ceiling 73 is connected to both side walls. 74 and 75 are provided in a protruding manner to close the gap with the upper end opening 63 of the burner body. These both side walls 74, 7
5, a pair of slits 74A and 75A are provided on the back side as a flame port for the pilot flame A, and a pair of slits 74B and 75B are provided on the outside as a flame port for the extinguishing detection flame B. has been done. Each of these slits is provided diagonally outward at a predetermined angle.

The open ring portion 62 of the burner body is tapered to expand downward, and an ignition electrode 9 having a spark discharge electrode 92 covered with an insulator 91 is provided on the back side.
A discharge gap 3A is formed between the burner cap and a protrusion 73A protruding from the lower surface of the ceiling 73 of the burner cap. Furthermore, a thermocouple 10 serving as a safety device sensor is attached to the outer side of the ring-opening portion 62 in parallel to the ignition electrode 9. Also, the umbrella part 71
A comb-like protrusion 7 is provided on the outer edge of the lower surface excluding the ceiling 73.
A is provided around the outer edge 6 of the upper end opening of the burner body.
5, an outer circumferential burner port row 13, which is an annular main port, is formed. Furthermore, three pairs of central flame ports 7 are provided on the inner periphery of the umbrella portion 71.
6 is provided.

The upstream end 81 of the mixing tube 8 serves as an inlet for fuel gas and primary air, and an intake port 82 for the primary air is provided at the end surface. On the upper surface of the stove case 5, the space between the broth saucer 51 and the outer periphery of the burner 1 is covered with an annular soup cover 53 to prevent the broth from falling into the inside of the case 5. The gas supply system 2 includes a gas conduit 21 that is normally connected to a gas pipe via a rubber hose, and a valve 2.
2. It has a nozzle 23 whose tip is inserted into the mixing tube 8, and the valve 22 can be opened and closed by operating a knob 24 and can be maintained by the output of the thermocouple.

The ignition device 3 includes a high voltage generating means 32 consisting of the ignition electrode 9 and 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. and a lead wire 33 connecting these. This high voltage generating means 32 is normally operated by the knob 24, and is designed to generate sparks in the discharge gap 3A in conjunction with the opening of the valve 22.

The safety device 4 is composed of the thermocouple 10 and an electromagnet (not shown) provided in the valve 22 so as to maintain the valve body of the valve 22 in an open state with the output of the thermocouple 10. When normal combustion occurs and the temperature of the thermocouple 10 is higher than the set temperature due to heating by the flame B,
The valve 22 is kept open and the thermocouple 1 is
When the temperature at zero falls below a set value, the valve element is actuated in the valve closing direction by the action of a spring (not shown) installed behind it.

Next, the operation of this gas stove 100 will be explained. When the knob 24 is pressed, the valve 22 opens, and water is ejected from the nozzle 23 connected downstream of the valve 22. Air is sucked in by the ejector from the primary air intake port 82 by the ejected flow of gas, mixed in the mixing tube 8, and supplied into the burner body 6A. When the knob 24 is rotated in conjunction with the pushing operation of the knob, the ignition device 3 is activated and sparks are generated in the spark discharge gap 3A. The air-fuel mixture blown out from the slits 74A and 75A, which are air-fuel mixture supply paths, is ignited to generate pilot flames A1 and A2. The mixture blown out from the slits 74B and 75B is ignited by these seed flames A1 and A2,
Heating flames B1 and B2 of the thermocouple 10 are generated. The heating flames B1 and B2 are blown out from the flame outlet 11 and ignite the air-fuel mixture blown out from the main burner port (outer flame port array) 13 of the burner.

That is, in this embodiment, the heating flames B1 and B2 ignited at the main nozzle 13 by the flame relay act as flames that compensate for the defective portion of the peripheral flame 13A generated at the main nozzle 13. At this time, the seed flames A1 and A2 are set to intersect at an angle of approximately 90°, and are stabilized by interference. Further, the inner outer flame portions of the flames B1 and B2 contact both sides of the heat-sensitive portion of the thermocouple 10, and intersect at an angle of approximately 60° outside the thermocouple 10. The intersecting flames B1 and B2 form an interference flame that extends outward from the burner head. In this case, the flames A1, A2
The flames B1 and B2 are stabilized because sufficient secondary air is smoothly supplied from below and from the lower side without being disturbed. In addition, since there are few low-temperature solid walls that produce an extinguishing effect, flame deterioration due to extinguishing is less likely to occur. As a result, the pilot flame ignites the pilot crater stably and quickly.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a gas stove using a gas burner of the present invention.

FIG. 2 is a plan view of the burner cap.

FIG. 3 is a front view of the gas burner.

FIG. 4 is an assembly diagram of the gas burner.

FIG. 5 is a perspective view of the burner cap.

[Explanation of symbols]

1 Gas burner 2 Gas supply system 3 Ignition device 6 Burner body 7 Burner cap 62 Opening part

Claims (1)

[Claims] Claim 1: An open annular head having an open upper end and having a body part and an open ring part connected to the upper end of the body part and increasing in width downward at a position opposite to the body part. and a burner cap that is placed on the head of the burner body, closes the upper end opening, and forms a rear row of peripheral flames on the outer peripheral side joint surface with the burner body. A gas burner.