JP2020085272A - Cooking stove burner - Google Patents

Abstract

To provide cooking stove burners of two upper and lower stages capable of avoiding generation of loud ignition sound or back fire and suppressing a dimension of the cooking stove burners in a height direction.SOLUTION: Multiple lower-stage flame port passages (128) are partially defined as fire transfer flame port passages (129) of which the vertical dimension is larger than the other lower-stage flame port passages, and ceiling planes of the passages are inclined upwards toward the radial outside. Regarding at least the ceiling plane of the transfer flame port passage, the inclination is reduced or made horizontal in a radial outside portion, thereby forming a gently inclined part (127b). Thus, a flame is transferred to an upper-stage flame port by flames of the transfer flame port, and the flames are made away from upper-stage flame ports by the gently inclined part of the transfer flame port passages and ignition of a mixture gas in the upper-stage flame ports is delayed, thereby avoiding generation of loud ignition sound or back fire. Further, it is enough only to form a little longer gently inclined part on the ceiling plane of the transfer flame port passage, thereby also preventing design freedom of the cooking stove burner from being narrowed or the dimension in the height direction from being enlarged.SELECTED DRAWING: Figure 7

Description

The present invention relates to a burner burner in which a plurality of flame openings are opened in two stages on the outer peripheral side surface of a burner head mounted on a burner body.

BACKGROUND ART A stove burner is known in which a burner head mounted on a burner body is provided with flame openings that are opened in two steps on the outer peripheral side surface. In this upper and lower two-stage stove burner, the mixed gas is supplied to the lower flame port (lower flame port), but the mixed gas is not supplied to the upper flame port (upper flame port) (lower stage supply state). ) And a state in which the mixed gas is supplied to both the lower flame mouth and the upper flame mouth (upper stage supply state). Then, while the required thermal power is small, the mixed gas is supplied in the lower stage supply state to burn the mixed gas in the lower flame port, and when the required thermal power becomes large, the mixed gas is supplied in the upper stage supply state. Thus, the mixed gas is burned not only in the lower flame tip but also in the upper flame tip. By doing so, it is possible to realize a wide adjustment range of thermal power from small thermal power to large thermal power. In addition, in such an upper and lower two-stage stove burner, combustion in the upper flame mouth always starts in a state in which the lower flame mouth is burning. By burning the flame, the combustion of the upper flame mouth is started.

Here, when starting the supply of the mixed gas to the upper flame mouth, if the flame transfer from the lower flame mouth to the upper flame mouth is delayed, the mixed gas flowing out from the upper flame mouth at a stretch until the flame transfer Ignition may result in loud ignition noise. Therefore, in order to avoid such a situation, a part of the lower-stage flame mouth is set as a fire-transfer flame mouth having a larger vertical dimension than the other lower-stage flame mouth, and the fire is quickly transferred from the fire-transfer flame mouth to the upper-stage flame mouth. Is being done. On the other hand, it is also known that if a flame transfer flame port is provided, a flashback is likely to occur at the upper flame port. The reason for this is as follows. First, at the time of starting the supply of the mixed gas to the upper flame outlet, the outflow rate of the mixed gas from the upper flame outlet is still zero, so some time is required to increase it to the predetermined outflow rate. Become. Therefore, if a flame transfer flame port is provided and the flame is quickly transferred to the upper flame port, the flame will be transferred at a time when the outflow rate of the mixed gas from the upper flame port is still low. As a result, the combustion speed of the mixed gas exceeds the outflow speed from the upper flame mouth, and a phenomenon called "backfire" in which the flame traces back the outflow of the mixed gas is likely to occur.

Therefore, in order to prevent a flashback at the time of the fire transfer from the lower flame mouth to the upper flame mouth, and also to prevent a large ignition noise from being generated, the upper end of the flame transfer flame mouth and the lower end of the upper flame mouth are A stove burner has also been proposed in which the vertical distance between them is set within a predetermined size range with respect to the vertical size of the flame transfer flame port (Patent Document 1).

JP 2012-127563 A

However, in the proposed conventional stove burner, the vertical distance between the upper end of the flame transfer flame mouth and the lower end of the upper stage flame flame is within a predetermined size range with respect to the vertical dimension of the flame transfer flame flame. Since it is restricted, there is a problem that the degree of freedom in designing the stove burner is reduced, and it is particularly difficult to reduce the size of the stove burner in the height direction.

This invention was made to solve the above-mentioned problems in the prior art, and while avoiding the occurrence of a large ignition noise or flashback at the start of combustion at the upper flame mouth, It is an object of the present invention to provide an upper and lower two-stage stove burner capable of reducing the dimension in the height direction.

In order to solve the above-mentioned subject, the stove burner of the present invention adopted the following composition. That is,
A plurality of flame port passages formed in upper and lower two stages are opened to the outer side surface, and a ring-shaped burner head having a plurality of upper and lower stage flame ports is formed, and the burner head is mounted on the burner head. A burner body for supplying a mixed gas to the burner head, wherein the mixed gas is supplied to the lower flame port passage but the mixed gas is not supplied to the upper flame port passage from the lower supply state to the lower flame port passage. And when switching to the upper-stage supply state in which the mixed gas is supplied to the upper-stage flame port passage, the flame in the lower-stage flame port transfers to the upper-stage flame port to start combustion in the upper-stage flame port. At
A part of the plurality of lower stage flame passages has a vertical dimension that is a larger flame transfer flame passage than the other lower stage flame passages,
The ceiling surfaces of the flame transfer mouth passage and the other lower-stage flame mouth passage are inclined upward toward the outer side in the radial direction of the burner head, and at least with respect to the ceiling surface of the flame transfer flame passage, A gentle slope is formed on the ceiling surface by making the inclination of the ceiling surface smaller or horizontal in the radially outer portion,
The gentle sloped portion that is longer than the ceiling surface of the other lower stage flame outlet passage is formed on the ceiling surface of the flame transfer outlet passage.

In such a stove burner of the present invention, a part of the plurality of lower flame outlet passages is a transfer flame outlet passage having a larger vertical dimension than the other lower flame outlet passages. In addition, the ceiling surfaces of the flame transfer vent passage and the other lower flame vent passages are inclined upward toward the outside in the radial direction of the burner head, and at least the ceiling surface of the flame transfer vent passage has a ceiling. The slope of the surface becomes smaller or becomes horizontal in the radially outer portion, and a gentle slope is formed on the ceiling surface. A gentle slope is formed on the ceiling surface of the flame transfer flame port passage as compared to the ceiling surfaces of other flame port passages.

By doing so, a larger flame is formed in the vertical direction at the flame transfer nozzle than in the other lower flame nozzles, so it is possible to transfer the flame to the upper flame nozzle more quickly, and at the start of combustion at the upper flame nozzle, it becomes larger. It is possible to prevent the ignition sound from being generated. In addition, since the mixed gas flowing out from the flame transfer flame port has its flow direction changed by the gently sloping part, compared to the mixed gas flowing out from the other lower flame port, it flows in a direction away from the upper flame port. Therefore, the flame of the flame transfer nozzle is also formed at a position farther from the upper flame nozzle than the flames of the other lower flame nozzles. Therefore, at the start of combustion at the upper flame mouth, the time until the mixed gas flowing out from the upper flame mouth reaches the flame at the flame transfer flame mouth is delayed, and the mixed gas flowing out from the upper flame mouth is delayed by that time. It is possible to secure time for the speed of the vehicle to increase. As a result, when the mixed gas from the upper flame mouth ignites, the outflow speed of the mixed gas flowing out of the upper flame mouth can be increased to the extent that flashback does not occur, and the occurrence of flashback is avoided. It becomes possible. Furthermore, since it is sufficient to form a gentle sloping portion on the ceiling surface of the flame transfer burner passage that is longer than the ceiling surface of other lower flame burner passages, the design freedom of the burner burner is not reduced, and the high burner burner's design is improved. The size in the depth direction does not become large.

Further, in the above-described stove burner of the present invention, at least with respect to the flame transfer flame port passage, the ceiling surface is projected outward in the radial direction with respect to the floor surface of the flame transfer flame port passage, and is projected from the floor surface. From the ceiling surface of the part, a flame port wall that separates from the adjacent lower flame channel passage may be hung.

In this way, the mixed gas flowing out from the flame transfer flame port is guided radially outward by the flame transfer wall, so that the flame formed at the flame transfer flame port can be kept away from the upper stage flame port. As a result, the ignition of the mixed gas flowing out from the upper flame tip can be delayed, so that the occurrence of flashback at the upper flame tip can be more reliably avoided.

Further, in at least the flame transfer passage, the ceiling surface is projected outward in the radial direction from the floor surface, and the flame burner wall is hung from the ceiling surface. The length of the flame outlet wall may be shortened toward the outer side in the radial direction.

In this case, since the flame port wall is formed in the upper part of the flame transfer flame port, the flame position can be moved to the outside in the radial direction, and the occurrence of flashback at the upper flame port can be avoided. On the other hand, in the lower part of the flame transfer flame port, the length of the flame port wall toward the outside in the radial direction becomes short, so that the flame transfer to the adjacent lower flame port becomes easy.

Further, in the above-described stove burner of the present invention, a mixed gas having a larger ratio of fuel gas to air than the upper flame port passage may be supplied to the lower flame port passage.

In this way, the proportion of fuel gas also increases in the mixed gas supplied to the flame transfer flame port, and the flame formed at the flame transfer flame port can be increased. As a result, even if the flame position of the flame transfer flame port is far from the upper flame port, it is possible to reliably ignite the mixed gas flowing out from the upper flame port, so avoid a situation where a loud ignition noise is generated. Is possible.

It is explanatory drawing which showed the rough shape of the stove burner 1 of a present Example. 3 is an exploded view showing the detailed shapes of a lower head 120 mounted on the burner body 11 and an upper head 110 mounted on the lower head 120. FIG. It is explanatory drawing about the flame port wall 125 and the flame transfer flame port groove 127 which were formed in the lower surface side of the lower head 1200. It is sectional drawing which showed the detailed shape of the lower stage flame port groove 126. It is explanatory drawing about the method of prescribing the vertical dimension of the lower stage flame port 120b (and the flame transfer flame port 120c). It is sectional drawing which showed the detailed shape of the flame transfer groove 127. It is explanatory drawing about the reason why the occurrence of flashback of the stove burner 1 can be avoided by lengthening the length of the gentle inclination part 127b of the flame transfer flame port passage 129. It is explanatory drawing about the case where the length of the gentle inclination part 127b of the flame transfer flame port passage 129 is shortened for reference.

FIG. 1 is an explanatory view showing a rough shape of the stove burner 1 of this embodiment. As shown in FIG. 1( a ), roughly speaking, the stove burner 1 of the present embodiment has a structure in which a burner head 100 made of casting or die casting is placed on a burner body 10 made of sheet metal. Is becoming The burner body 10 has a substantially cylindrical burner body 11 and two mixing passages 12 and 13 connected to the burner body 11. Further, the burner head 100 is divided into an upper head 110 and a lower head 120, and the lower head 120 is placed on the burner body 11 and the upper head 110 is placed on the lower head 120. ing.

The outer surface of the upper head 110 has a substantially cylindrical shape, and a plurality of upper flame ports 110a are opened on the outer surface. Similarly, the outer surface of the lower head 120 also has a substantially cylindrical shape, and a plurality of upper flame openings 120a are also formed on this outer surface. Further, as will be described later in detail, a plurality of grooves are radially formed on the lower surface side (the side mounted on the burner body 11) of the lower head 120. Therefore, when the lower head 120 is placed on the burner body 11, a plurality of lower flame openings 120b are also opened between the lower head 120 and the burner body 11. An ignition target 120t is provided so as to project from the outer surface of the lower head 120, and an ignition plug 20 for spark-discharging toward the ignition target 120t is provided at a position below the ignition target 120t. Further, a flame detection sensor 30 is also provided at a position adjacent to the spark plug 20.

Further, as described above, the mixing passage 12 formed in the burner body 10 has one end side connected to the burner body 11, but the other end side has an opening end 12o, and the position facing the opening end 12o is An injection nozzle (not shown) is provided. Similarly, one end side of the mixing passage 13 is also connected to the burner body 11, but the other end side is an opening end 13o, and an injection nozzle (not shown) is provided at a position facing the opening end 13o. The downstream side gas pipe 2a is connected to the injection nozzle at the opening end 12o, and the downstream side gas pipe 2b is connected to the injection nozzle at the opening end 13o. The downstream side gas pipe 2a and the downstream side gas pipe 2b are upstream. The side is branched from one upstream gas pipe 2. A main valve 3 is interposed in the upstream gas pipe 2, a flow control valve 4a is interposed in the downstream gas pipe 2a, and a flow control valve 4b is interposed in the downstream gas pipe 2b. Has been done. The main valve 3, the flow rate control valve 4a, and the flow rate control valve 4b are connected to a control unit (not shown) of the stove burner 1. Further, the ignition plug 20 and the flame detection sensor 30 described above are also connected to the control unit.

The stove burner 1 operates as follows. First, when the main valve 3 is opened, the flow rate control valve 4a is closed, and the flow rate control valve 4b is opened, the fuel gas from the upstream side gas pipe 2 flows into the downstream side gas pipe 2b and the downstream side. It is injected from an injection nozzle (not shown) attached to the end of the gas pipe 2b. Then, the injected fuel gas flows into the mixing passage 13 so as to wrap the surrounding air, and the fuel gas and the air are mixed in the mixing passage 13 to form a mixed gas. Further, the inside of the burner body 11 has a double structure, and the mixing passage 13 communicates with the lower stage flame outlet 120b inside the burner body 11. Therefore, the mixed gas formed in the mixing passage 13 flows out from the lower flame port 120b. Further, since the mixing passage 13 does not communicate with the upper flame port 110a or the upper flame port 120a, the mixed gas formed in the mixing passage 13 does not flow out from the upper flame port 110a or the upper flame port 120a.

When the mixed gas flowing out from the lower flame outlet 120b is ignited by blowing a spark from the ignition plug 20 in this manner, the combustion of the mixed gas is started at the lower flame outlet 120b. Further, the combustion thermal power can be adjusted by adjusting the flow rate of the fuel gas with the flow rate adjusting valve 4a. In this state, that is, when the main valve 3 and the flow rate control valve 4b are opened and the flow rate control valve 4a is closed, the mixed gas is supplied to the lower flame port 120b, but the upper flame port 110a and the upper flame port 110a are closed. The state in which the mixed gas is not supplied to the flame port 120a corresponds to the "lower stage supply state" in the present invention. In addition, a combustion state in the “lower stage supply state”, that is, a state in which the mixed gas is combusted in the lower stage flame port 120b, but the mixed gas is not combusted in the upper stage flame port 110a and the upper stage flame port 120a is described below. It may be referred to as "lower combustion state".

In this way, when the flow rate control valve 4a that has been closed until then is opened while the mixed gas is being burned in the lower combustion state, the injection nozzle (not shown) attached to the pipe end of the downstream gas pipe 2a Fuel gas will also be injected. As a result, the injected fuel gas flows into the mixing passage 12 so as to wrap the surrounding air, and the mixed gas is formed in the mixing passage 12. Since the mixing passage 12 communicates with the upper stage flame port 110a and the upper stage flame port 120a inside the burner body 11, the mixed gas formed in the mixing channel 12 flows out from the upper stage flame port 110a and the upper stage flame port 120a. To do. The flame caused by the combustion in the lower flame port 120b is transferred to the mixed gas, so that the combustion in the upper flame port 110a and the upper flame port 120a is started. In this state, that is, when the main valve 3, the flow rate control valve 4a, and the flow rate control valve 4b are all opened, the mixed gas is supplied to the lower flame port 120b, and the upper flame port 110a and the upper flame port 120a are also supplied. The state in which the mixed gas is supplied corresponds to the “upper and lower stage supply state” in the present invention. Further, a combustion state in the “upper and lower stage supply state”, that is, a state in which the mixed gas is combusted in the lower stage flame port 120b and the mixed gas is also combusted in the upper stage flame port 110a and the upper stage flame port 120a will be referred to as “upper” below. It may be referred to as "lower combustion state".

FIG. 2 is an exploded view showing the detailed shapes of the lower head 120 mounted on the burner body 11 and the upper head 110 mounted on the lower head 120. As illustrated, the burner body 10 is formed by pressing a sheet metal member, and includes a substantially cylindrical burner body 11 and mixing passages 12 and 13 connected to the burner body 11. The cylindrical burner body 11 has an annular mounting surface 11 s formed by bending the cylindrical upper end obliquely downward toward the inner side in the radial direction. Further, a cylindrical pipe member 14 is erected inside the burner body 11, and a space between the inside of the burner body 11 and the outside of the pipe member 14 serves as a mixing chamber 15.

Further, inside the burner body 11, an intermediate body 16 made of sheet metal and press-formed into a substantially cylindrical shape having a smaller diameter than the burner body 11 is incorporated. Of the mixing chamber 15b on the outer side (that is, the portion between the burner body 11 and the intermediate body 16) and on the inner side of the intermediate body 16 (that is, the portion between the intermediate body 16 and the pipe member 14). It is divided into a mixing chamber 15a. The mixing chamber 15b therein communicates with the mixing passage 13, and the mixing chamber 15a communicates with the mixing passage 12. Further, the upper end of the substantially cylindrical intermediate body 16 is bent inward in the radial direction, and then the tip side thereof is further bent downward to form a short cylindrical positioning portion 16a. ..

The lower head 120 is a substantially cylindrical member, and a diameter-increasing portion 122 is formed by expanding the diameter of the upper portion of the cylindrical partition wall portion 121 into a trumpet shape, and an outer edge portion on the upper surface side of the diameter-increasing portion 122 is formed. Has a cylindrical wall 123 having a diameter larger than that of the partition wall 121 and protruding upward. Further, a plurality of upper stage flame port grooves 124 penetrating the tubular wall 123 in the radial direction are formed on the upper end surface of the tubular wall 123. As a result, a plurality of upper stage flame ports 120a are formed at the positions where the plurality of upper stage flame port grooves 124 are opened to the outer surface of the cylindrical wall 123. Further, on the lower surface side of the expanded diameter portion 122, a plurality of flame port walls 125 extending in the radial direction are provided so as to project downward, and between the adjacent flame port walls 125 and 125. A groove-shaped lower stage flame port groove 126 is formed. Further, an ignition target 120t is provided so as to project radially outward from the outer surface of the cylindrical wall 123.

The lower head 120 as described above is mounted on the burner body 11 while positioning the outer surface of the partition wall 121 by the cylindrical positioning portion 16a formed at the upper end of the intermediate body 16. Then, the lower end of the flame port wall 125 protruding downward from the lower head 120 contacts the mounting surface 11s of the burner body 11, and as a result, the lower flame port groove 126 between the adjacent flame port walls 125 is formed. A passage is formed by the mounting surface 11s. When the lower head 120 is placed on the burner body 11, the outer portion of the partition wall 121 communicates with the mixing chamber 15b described above. Therefore, the mixed gas formed in the mixing passage 13 is supplied to the passage formed by the lower flame port groove 126 and the mounting surface 11s via the mixing chamber 15b. In this embodiment, this passage is referred to as a "lower stage flame port passage". Further, the radially outer opening end of the lower stage flame port passage is the lower stage flame port 120b described above with reference to FIG.

The upper head 110 is a substantially ring-shaped member, and has a ring-shaped main body portion 111 having a through hole 111a formed in the center thereof, and a cylinder projecting downward from the outer edge portion of the lower surface side of the main body portion 111. The wall 112 is provided. The diameter of the tubular wall 112 is set to be the same as the diameter of the tubular wall 123 of the lower head 120. In addition, a plurality of upper stage flame port grooves 113 penetrating the tubular wall 112 in the radial direction are formed in the lower end surface of the tubular wall 112. For this reason, a plurality of upper stage flame ports 110a are formed at positions where the plurality of upper stage flame port grooves 113 are opened to the outer surface of the cylindrical wall 112. Further, on the lower surface side of the main body portion 111, a cylindrical member (not shown) coaxial with the cylindrical wall 112 and the through hole 111a and having a smaller diameter than the cylindrical wall 112 but a larger diameter than the through hole 111a is provided downward. It is projected toward.

When mounting the upper head 110 on the lower head 120, a cylindrical member (not shown) protruding from the lower surface side of the main body 111 is inserted into the pipe member 14 of the burner body 11. By doing so, the cylindrical wall 112 of the upper head 110 can be positioned so as to be coaxial with the cylindrical wall 123 of the lower head 120. While positioning in this way, the lower end surface of the cylindrical wall 112 of the upper head 110 is brought into contact with the upper end surface of the cylindrical wall 123 of the lower head 120. Further, the upper-stage flame mouth groove 124 formed in the cylindrical wall 123 of the lower head 120 and the upper-stage flame mouth groove 113 formed in the cylindrical wall 112 of the upper head 110 are formed at alternate positions. ing. Therefore, when the lower end surface of the tubular wall 112 is brought into contact with the upper end surface of the tubular wall 123, the upper side of the upper stage flame port groove 124 formed in the upper end surface of the tubular wall 123 is located above the tubular wall 112. A passage is formed by closing the lower end surface, and an upper stage flame outlet 120a is formed at a position where the passage opens to the outer peripheral side surface of the cylindrical wall 123. A passage is formed by closing the lower part of the upper flame mouth groove 113 formed in the lower end surface of the cylindrical wall 112 with the lower end surface of the cylindrical wall 112, and the passage is formed outside the cylindrical wall 112. The upper stage flame port 110a is formed at a position open to the side surface.

Further, when the lower head 120 is placed on the burner body 11 and the upper head 110 is placed on the lower head 120, the lower head 120 is located inside the partition wall 121 of the lower head 120 and outside the pipe member 14. The part is in a state of being connected to the above-mentioned mixing chamber 15a. Therefore, the mixed gas formed in the mixing passage 12 passes through the mixing chamber 15a and passes through these passages (that is, the passage formed by the upper flame port groove 124 and the lower end surface of the cylindrical wall 112, and the upper flame port groove). It is supplied to a passage formed by 113 and the upper end surface of the cylindrical wall 123. In the present embodiment, these passages are referred to as "upper flame port passages".

Further, as described above with reference to FIG. 1, in the stove burner 1 of the present embodiment, the flame formed at the lower flame port 120b is transferred to the mixed gas flowing out from the upper flame port 110a and the upper flame port 120a. It is designed to be ignited. Therefore, a part of the plurality of lower flame outlets 120b has a special shape for transferring fire.

FIG. 3 is an explanatory view showing the detailed shape of the lower flame port groove 126 formed on the lower surface side of the lower head 1200. Note that, in FIG. 3, the upper head 110 mounted on the lower head 120 is indicated by a broken line. As shown in the figure, a plurality of flame port walls 125 project downward from the lower surface side of the lower head 1200, and as a result, a lower step is formed between the adjacent flame port walls 125. A flame hole groove 126 is formed. When the lower head 120 is placed on the burner body 11, these flame port walls 125 come into contact with the placement surface 11s of the burner body 11 at the lower end surface 125s with diagonal lines in the drawing. Further, in the plurality of lower stage flame port grooves 126, a fire transfer flame port groove 127 having a deeper groove depth than the other lower stage flame port grooves 126 is also formed. The passage formed by the fire transfer flame port groove 127 and the mounting surface 11s when the lower head 120 is placed on the burner body 11 is hereinafter referred to as a "fire transfer flame port passage".

FIG. 4 is an explanatory view showing the detailed shape of the lower flame port groove 126 by taking a cross section of the lower head 120 at the lower flame port groove 126. FIG. 4A shows a sectional view of the lower head 120 alone, and FIG. 4B shows a sectional view of the lower head 120 mounted on the burner body 11. In FIGS. 4A and 4B, the cross section of the upper head 110 is also indicated by a broken line for reference.

As described above, the mounting surface 11s of the burner body 11 is formed in a state of being inclined upward toward the outer side in the radial direction (see FIG. 2). Along with this, the lower end surface 125s of the flame port wall 125 that abuts on the mounting surface 11s is also formed in a state in which it is inclined upward in the radial direction as shown in FIG. 4A. For this reason, the ceiling surface 126a of the lower flame mouth groove 126 is also formed in a state of being inclined upward toward the outer side in the radial direction, but the inclination of the ceiling surface 126a becomes smaller (or horizontal) at the radially outer portion. (Or by slightly sloping downward toward the outside in the radial direction), a gentle slope 126b having a length L1 is formed. Further, the ceiling surface 126a including the gently inclined portion 126b has a shape protruding outward in the radial direction from the outer end of the lower end surface 125s of the flame port wall 125. The outer end surface 125a on the outer side in the radial direction of the flame opening wall 125 has a shape that connects the outer end of the bulging gently sloping portion 126b and the outer end of the lower end surface 125s of the flame opening wall 125 in a substantially linear manner. ing. In the present embodiment, the description will be made assuming that the gentle sloped portion 126b having a short length L1 is formed on the outer side portion of the ceiling surface 126a of the lower flame mouth groove 126, but the gentle sloped portion 126b is not necessarily formed. It doesn't matter.

When the lower head 120 having the lower-stage flame port groove 126 formed as described above is mounted on the burner body 11, the space between the lower-stage flame port groove 126 and the mounting surface 11s of the burner body 11 is shown in FIG. The lower flame port passage 128 is formed. When the lower head 120 is mounted on the burner body 11, the mounting surface 11s forms the floor surface of the lower flame port passage 128. Then, the lower-stage flame port passage 128 opens outward in the radial direction to form the lower-stage flame port 120b. The lower flame port 120b has a three-dimensional shape. Therefore, the vertical dimension of the lower flame outlet 120b has different values depending on the measurement method. Therefore, in this embodiment, as shown in FIG. 4B, attention is paid to the fact that the outer end of the mounting surface 11s and the outer end of the lower end surface 125s of the flame port wall 125 are substantially at the same position. Then, at the position of the outer end of the lower end surface 125s (point E in FIG. 4B), the dimension of the lower flame port passage 128 is measured in the vertical direction. Then, the vertical dimension of the lower flame port passage 128 becomes H1.

As described above, in the present embodiment, the outer end of the mounting surface 11s and the outer end of the lower end surface 125s of the flame port wall 125 substantially overlap each other, but they do not always substantially overlap. In such a case, the outer end position of the floor surface of the lower flame mouth passage 128 may be set to point E. Actually, the point E shown in FIG. 4B also corresponds to the position of the outer end of the lower flame port passage 128. That is, when it comes to the outer side in the radial direction from the point E, the mounting surface 11s forming the floor surface of the lower flame port passage 128 ends and the surface of the burner body 11 moves away from the flame port wall 125. The lower-stage flame port passage 128 is not formed at this point. Further, the flame port wall 125 forming the side surface of the lower flame port passage 128 also moves from the lower end face 125s to the outer end face 125a on the outer side in the radial direction from the point E and does not come into contact with the surface of the burner body 11. Therefore, the lower flame port passage 128 is not completely formed. In this way, the position where the lower-stage flame mouth passage 128 ends radially outward (the outer end of the lower-stage flame mouth passage 128) can be considered, and the position of the floor surface at the outer end is E in FIG. 4(b). It is a point.

Further, as illustrated in FIG. 5A, when the outer end of the lower end surface 125s of the flame port wall 125 is formed radially outward of the outer end of the mounting surface 11s, the mounting surface 11s is At the outer side in the radial direction from the outer end of the lower end 125s, the lower end surface 125s of the flame port wall 125 separates from the surface of the burner body 11, so that the lower flame port passage 128 is not formed completely. Therefore, in such a case, the position of the outer end of the mounting surface 11s becomes the point E. Alternatively, as illustrated in FIG. 5B, when the outer end of the mounting surface 11s is formed more radially outward than the outer end of the lower end surface 125s of the flame opening wall 125, the flame opening wall On the outer side in the radial direction of the lower end surface 125s of 125, the lower end surface 125s moves to the outer end surface 125a and the lower end surface 125s of the flame port wall 125 separates from the surface of the burner body 11. The flame mouth passage 128 is not formed. Therefore, in such a case, the position of the outer end of the lower end surface 125s of the flame port wall 125 is point E.

FIG. 6 is an explanatory view showing the detailed shape of the flame transfer flame port groove 127 by taking a cross section of the lower head 120 at the portion of the flame transfer flame port groove 127 shown in FIG. FIG. 6A shows a state before the lower head 120 is placed on the burner body 11, and FIG. 6B shows a state where the lower head 120 is placed on the burner body 11.

Similar to the lower stage flame port groove 126 described above with reference to FIG. 4, the fire transfer flame port groove 127 is also formed in a state of being inclined upward toward the outer side in the radial direction. Along with this, the ceiling surface 127a of the flame transfer groove 127 is also formed in a state of being inclined upward toward the outside in the radial direction, but the inclination of the ceiling surface 127a becomes smaller at the portion on the outside in the radial direction. A gentle sloping portion 127b is formed (or by being horizontal or slightly sloping downward in the radial direction). The length L2 of the gently inclined portion 127b of the flame transfer groove 127 is larger than the length L1 of the gently inclined portion 126b of the lower flame hole groove 126 described above with reference to FIG. If the gentle slope portion 126b is not formed in the lower flame mouth groove 126, the length L1 of the gentle slope portion 126b can be considered to be zero. This means that a gentle slope 127b that is longer than the flame hole groove 126 is formed.

Further, similarly to the gentle slope portion 126b (see FIG. 4) of the lower flame mouth groove 126 described above, the gentle slope portion 127b of the flame transfer flame mouth groove 127 has a radius larger than that of the outer end of the lower end surface 125s of the flame mouth wall 125. The shape projects outward in the direction. Along with this, also with respect to the flame port walls 125 forming both side surfaces of the flame transfer channel 127, similarly to the case of the lower flame port 126 described with reference to FIG. The outer end surface 125a has a shape that linearly connects the outer end of the gently inclined portion 127b that projects and the outer end of the lower end surface 125s of the flame port wall 125.

When the lower head 120 having such a fire transfer flame groove 127 is placed on the burner body 11, a space between the flame transfer flame groove 127 and the mounting surface 11s of the burner body 11 is shown in FIG. A flame transfer flame port passage 129 is formed as shown in FIG. A mounting surface 11s is formed on the floor surface of the flame transfer flame port passage 129, and the flame transfer flame port 120c is formed by the flame transfer flame port passage 129 opening radially outward. This flame transfer flame port 120c also has a three-dimensional shape, but as in the case of the lower flame channel passage 128, at the point E at the outer end of the lower end surface 125s, the vertical dimension of the flame transfer flame channel 129. Is measured, it is H2 larger than the vertical dimension of the lower flame mouth passage 128.

As is clear from a comparison between FIG. 4 and FIG. 6, the fire transfer flame port passage 129 shown in FIG. 6(b) is closer to the floor surface than the lower stage flame port passage 128 shown in FIG. 4(b). The height H2 from the mounting surface 11s is higher, and the vertical dimension H2 of the flame transfer flame port 120c formed at the opening of the flame transfer flame port passage 129 is also the opening portion of the lower flame port passage 128. It is larger than the vertical dimension H1 of the lower flame port 120b formed in the above. Therefore, a larger flame is formed in the vertical direction in the fire transfer flame port 120c than in the lower flame port 120b, and when the mixed gas is flowed out from the upper flame port 110a and the upper flame port 120a, the mixed gas is mixed. It is possible to quickly transfer the fire to the gas. As a result, it is possible to avoid the occurrence of a large ignition noise at the start of combustion at the upper flame outlet 110a and the upper flame outlet 120a.

In addition, in the flame transfer flame port passage 129 of the present embodiment, a gently sloping portion in which the inclination of the ceiling surface 127a is reduced to almost horizontal is provided on the outer side portion of the ceiling surface 127a formed upward in the radial direction. 127b is formed (see FIG. 6A). The length L2 of the gentle slope 127b is sufficiently larger than the length L1 of the gentle slope 126b formed on the ceiling surface 126a of the lower flame mouth passage 128. By doing so, it is also possible to avoid the occurrence of a flashback at the upper stage flame port 110a and the upper stage flame port 120a at the start of combustion at the upper stage flame port 110a and the upper stage flame port 120a. The reason for this will be described below.

FIG. 7 shows a state immediately after starting the supply of the mixed gas to the upper flame outlet 110a and the upper flame outlet 120a from the state where the mixed gas is burned only at the lower flame outlet 120b (and the flame transfer flame outlet 120c). It is the explanatory view shown. The arrow shown by a thick broken line in the figure conceptually represents the flow of the mixed gas supplied to the flame transfer flame port 120c, and the figure displayed by a broken line on the outer side in the radial direction of the flame transfer flame port 120c is The flame formed at the flame transfer flame port 120c is conceptually represented. In addition, the arrows indicated by thick solid lines in the figure conceptually represent the flow of the mixed gas supplied to the upper flame port 110a and the upper flame port 120a.

At the time point before the supply of the mixed gas to the upper flame outlet 110a and the upper flame outlet 120a is started, the flow of the mixed gas does not exist on the upstream side of the upper flame outlet 110a and the upper flame outlet 120a. Then, as described above with reference to FIG. 1, when the flow rate control valve 4a is opened, the fuel gas flows into the mixing passage 12 from the downstream gas pipe 2a, a mixed gas is formed in the mixing passage 12, and this mixed gas It is supplied to the upper flame outlet 110a and the upper flame outlet 120a via the inside of the burner body 11. Therefore, even if the flow rate control valve 4a is opened, the mixed gas is not immediately supplied to the upper stage flame port 110a and the upper stage flame port 120a, but a little later. Then, in this delay period, the velocity of the mixed gas flowing out from the upper stage flame outlet 110a and the upper stage flame outlet 120a gradually increases from the state of zero velocity. The length of the arrow shown by the thick solid line in FIG. 7 becomes longer from the upper flame port 110a and the upper flame port 120a toward the upstream side, conceptually that the velocity of the mixed gas gradually increases. It represents. As described above, the velocity of the mixed gas when starting to flow out from the upper stage flame outlet 110a and the upper stage flame outlet 120a is small, so when the flame is transferred to this mixed gas, the combustion velocity of the mixed gas exceeds the outflow velocity. The flashback that the flame traces back the flow of the mixed gas is likely to occur.

However, in the stove burner 1 of the present embodiment, the gentle sloped portion 127b having a sufficient length is formed at the radially outer side portion of the ceiling surface 127a of the flame transfer flame port passage 129. Therefore, as indicated by a thick broken arrow in FIG. 7, the mixed gas flowing out from the flame transfer flame port 120c tends to flow in the horizontal direction while being guided by the gently sloping portion 127b. As a result, as shown by the broken line in FIG. 7, the flame of the flame transfer flame port 120c is formed at a position away from the upper flame port 110a and the upper flame port 120a. Therefore, in order to ignite the mixed gas flowing out from the upper flame outlet 110a and the upper flame outlet 120a, it is necessary to flow to a flame formed at a distant position. Will be late. Then, during the time when the ignition is delayed, the outflow speed of the mixed gas increases at the positions of the upper flame port 110a and the upper flame port 120a. Therefore, at the time of ignition, the outflow speed of the mixed gas at the upper flame opening 110a and the upper flame opening 120a can be made higher than the combustion speed, so that it is possible to suppress the occurrence of flashback.

In FIG. 8, as a reference, the vertical dimension of the flame transfer flame port 120c is made larger than that of the lower flame port 120b, but the length of the gentle sloping portion 127b is the same as that of the gentle sloping portion 126b of the lower flame port groove 126. The case is illustrated. In the flame transfer flame port 120c of the reference example shown in FIG. 8, since the length of the gently sloping portion 127c is short, the mixed gas flowing out from the flame transfer flame port 120c as indicated by the thick dashed arrow in FIG. Flows diagonally upward without being able to change the direction of flow horizontally. As a result, the flame at the flame transfer flame port 120c is formed near the upper flame port 110a and the upper flame port 120a, as indicated by the thick dashed arrow in FIG. For this reason, when the mixed gas flows out from the upper stage flame outlet 110a and the upper stage flame outlet 120a, it is ignited immediately, and it becomes impossible to secure a time for increasing the outflow speed of the mixed gas at the upper stage flame outlet 110a and the upper stage flame outlet 120a. As a result, the combustion speed of the mixed gas exceeds the outflow speed of the mixed gas at the upper flame port 110a and the upper flame port 120a, and flashback is likely to occur. As described above, in the stove burner 1 of the present embodiment, the flame formed at the flame transfer flame port 120c is formed at a position away from the upper flame port 110a and the upper flame port 120a, thereby avoiding the occurrence of flashback. be able to. For that purpose, since the gentle sloped portion 127b having a sufficient length may be formed on the outside of the ceiling surface 127a of the flame transfer flame passage 129, the burner head 100 can be designed without narrowing the degree of freedom. The height dimension of 100 does not become large.

Further, as is clear from comparison between the present embodiment shown in FIG. 7 and the reference example of FIG. 8, in the present embodiment, compared with the reference example, the mixed gas flowing out from the upper stage flame port 110a and the upper stage flame port 120a Fires later. However, in the present embodiment, a large ignition noise does not occur even if the ignition timing is delayed for the following reason. First, since the fire transfer flame port 120c has a large vertical dimension, a large flame is formed. Therefore, even if the position where the flame is formed is apart from the upper flame port 110a and the upper flame port 120a, the mixed gas flowing out from the upper flame port 110a and the upper flame port 120a can be reliably ignited. As a result, the mixed gas can be ignited before a large amount of the mixed gas flows out from the upper flame port 110a and the upper flame port 120a, so that a large ignition noise is not generated.

Further, in the burner head 100 of the present embodiment described above, as shown in FIG. 6, the flame port walls 125 on both sides of the flame transfer flame port passage 129 have points E corresponding to the outer ends of the flame transfer flame port channel 129. From, the shape is further extended outward in the radial direction. Therefore, the flame formed at the flame transfer flame port 120c is prevented from spreading in the circumferential direction of the burner head 100, and thus extends outward in the radial direction by that amount, and the upper stage flame port 110a and the upper stage flame port 110a. A flame is formed at a position away from 120a. As a result, it is possible to easily secure the time until the mixed gas flowing out from the upper flame nozzle 110a and the upper flame nozzle 120a is ignited, and it is possible to avoid the occurrence of flashback.

Further, in the burner head 100 of the present embodiment, the lower stage flame port passage 128 shown in FIG. 4 (the same applies to the flame transfer flame port passage 129 of FIG. 6) has a ceiling surface 126a (slowly inclined portion 126b) of the floor. The shape is such that it extends far outward in the radial direction from the surface. Along with this, the flame port walls 125 that form the both side surfaces of the passage largely project radially outward from the floor surface on the ceiling side of the passage, but the projection amount becomes smaller as the floor surface approaches. .. Therefore, the lower stage flame outlet 120b (or the flame transfer flame port 120c) and the adjacent lower stage flame port 120b (or the flame transfer flame port 120c) are radially outward at the upper portion of the flame port near the ceiling side of the passage. It is in a state of being separated by the protruding flame outlet wall 125. However, since the flame opening wall 125 becomes shorter as it gets closer to the floor surface, the distance from the adjacent lower flame opening 120b (or the flame transfer flame opening 120c) becomes smaller. Therefore, it is possible to easily transfer the flame formed by the lower flame outlet 120b (or the flame transfer flame outlet 120c) to the adjacent lower flame outlet 120b (or the flame transfer flame orifice 120c).

Further, in the above-described stove burner 1 of the present embodiment, a mixed gas having a larger proportion of fuel gas is supplied to the lower flame port 120b (and the fire transfer flame port 120c) than the upper flame port 110a and the upper flame port 120a. It may be done. The ratio of air to fuel gas in the mixed gas supplied to the lower flame port 120b (and the flame transfer flame port 120c) is determined by the size of the opening end 13o of the mixing passage 13 with respect to the nozzle diameter of the injection nozzle of the downstream gas pipe 2b. Similarly, the ratio of the air to the fuel gas in the mixed gas supplied to the upper flame port 110a and the upper flame port 120a is determined by the opening of the mixing passage 12 with respect to the nozzle diameter of the injection nozzle of the downstream gas pipe 2a. It depends on the size of the end 12o. Therefore, the size of the opening end 13o of the mixing passage 13 with respect to the nozzle diameter of the injection nozzle of the downstream gas pipe 2b is smaller than the size of the opening end 12o of the mixing passage 12 with respect to the nozzle diameter of the injection nozzle of the downstream gas pipe 2a. If set to, the ratio of the fuel gas in the mixed gas supplied to the lower flame port 120b (and the fire transfer flame port 120c) is set to the ratio of the fuel gas in the mixed gas supplied to the upper flame port 110a and the upper flame port 120a. It can be higher than the proportion of fuel gas. Then, if the ratio of the fuel gas in the mixed gas is increased in this way, the flame of the lower flame port 120b (and the fire transfer flame port 120c) is formed at a position apart from the upper flame port 110a and the upper flame port 120a. Also, since the mixed gas flowing out from the upper flame port 110a and the upper flame port 120a can be reliably ignited, it is possible to reliably avoid a situation where a large ignition noise is generated.

Although the stove burner 1 of the present embodiment has been described above, the present invention is not limited to the above embodiment, and can be implemented in various modes without departing from the scope of the invention.

1... Stove burner, 3... Main valve, 4a, 4b... Flow control valve,
10... Burner body, 11... Burner body, 11s... Mounting surface,
12... Mixing passage, 13... Mixing passage, 14... Pipe member,
15... Mixing chamber, 15a, 15b... Mixing chamber, 16... Intermediate body,
20... Spark plug, 30... Flame detection sensor, 100... Burner head,
110...upper head, 110a...upper flame tip, 112...cylindrical wall,
Reference numeral 113... Upper stage flame mouth groove, 120... Lower head, 120a... Upper stage flame mouth,
120b... Lower stage flame port, 120c... Fire transfer flame port, 121... Partition part,
122... Expanded part, 123... Cylindrical wall, 124... Upper flame mouth groove,
125... Flame wall, 125a... Outer end surface, 125s... Lower end surface,
126... Lower stage flame mouth groove, 126a... Ceiling surface, 126b... Slowly inclined portion,
127... Flame transfer groove, 127a... Ceiling surface, 127b... Slowly inclined portion,
128... Lower flame mouth passage, 129... Fire transfer flame passage, 1200... Lower head.

Claims (4)

A plurality of flame port passages formed in upper and lower two stages are opened to the outer side surface, and a ring-shaped burner head having a plurality of upper and lower stage flame ports is formed, and the burner head is mounted on the burner head. A burner body for supplying a mixed gas to the burner head, wherein the mixed gas is supplied to the lower flame port passage but the mixed gas is not supplied to the upper flame port passage from the lower supply state to the lower flame port passage. And when switching to the upper-stage supply state in which the mixed gas is supplied to the upper-stage flame port passage, the flame in the lower-stage flame port transfers to the upper-stage flame port to start combustion in the upper-stage flame port. At
A part of the plurality of lower stage flame passages has a vertical dimension that is a larger flame transfer flame passage than the other lower stage flame passages,
The ceiling surfaces of the flame transfer mouth passage and the other lower-stage flame mouth passage are inclined upward toward the outer side in the radial direction of the burner head, and at least with respect to the ceiling surface of the flame transfer flame passage, A gentle slope is formed on the ceiling surface by making the inclination of the ceiling surface smaller or horizontal in the radially outer portion,
The stove burner characterized in that the gentle sloped portion, which is longer than the ceiling surface of the other lower flame outlet passage, is formed on the ceiling surface of the flame transfer outlet passage. The stove burner according to claim 1,
For at least the fire transfer flame passage, the ceiling surface has a shape protruding outward in the radial direction from the floor surface of the fire transfer flame passage, and the ceiling surface of the portion protruding from the floor surface. From the above, a burner wall that divides between the adjacent lower burner passages is suspended. The stove burner according to claim 2,
The stove burner characterized in that the length of the flame outlet wall hanging from the ceiling surface is shorter toward the outer side in the radial direction. The stove burner according to any one of claims 1 to 3,
The stove burner characterized in that the mixed gas having a higher ratio of fuel gas to air than the upper flame mouth passage is supplied to the lower flame mouth passage.

Images