阅读说明：本技术 炉灶燃烧器 (Burner for stove or range ) 是由 荒松政男 近藤骏介 杉山真澄 英真次 蒲厚仁 于 2021-02-20 设计创作，主要内容包括：本发明提供一种能够消除逆喷并且能够在不进行再次点火操作的情况下继续烹饪的炉灶燃烧器。在混合管内生成燃料气体和空气的混合气体并向燃烧器主体供给,在载置于燃烧器主体上的燃烧器头部的火口燃烧混合气体。在混合管的开口部的周围设有火焰引导件,在火焰引导件设有供自开口部喷出的火焰碰撞的碰撞壁和相对于碰撞壁从上方及两侧方的位置向燃烧器主体所在的方向延伸设置的诱导壁。如此一来,利用碰撞壁及诱导壁将因逆喷而喷出的火焰向燃烧器主体所在的方向引导,因此燃烧器主体得到加热,堵塞火口的煮洒的汤汁蒸发,从而自然地消除逆喷。另外,混合管的开口部由火焰引导件包围,因此也不会产生因逆喷的火焰而损伤燃气灶内部的风险。(The present invention provides a burner of a cooking range capable of eliminating a reverse spray and capable of continuing cooking without a re-ignition operation. A mixed gas of fuel gas and air is generated in the mixing pipe and supplied to the burner body, and the mixed gas is burned in a burner head mounted on the burner body. A flame guide is provided around the opening of the mixing pipe, and the flame guide is provided with a collision wall against which the flame ejected from the opening collides and an induction wall extending from positions above and on both sides of the collision wall in the direction of the burner body. In this way, the flame sprayed by the back spray is guided in the direction of the burner body by the collision wall and the guide wall, so that the burner body is heated, and the boiled soup blocking the fire hole evaporates, thereby naturally eliminating the back spray. Further, since the opening of the mixing pipe is surrounded by the flame guide, there is no risk of damage to the interior of the gas range due to the back-blown flame.)

1. A cooktop burner, comprising: a mixing pipe in which a mixed gas of fuel gas and air is formed; a burner main body to which a mixed gas is supplied from the mixing pipe and on the upper surface of which an annular mounting surface is formed; and a burner head portion having a plurality of burner grooves formed in a lower end surface of a cylindrical wall, the burner head portion being placed on a placement surface of the burner body to form a plurality of burners opened in an outer peripheral side surface of the cylindrical wall, and the burner head portion being configured to heat and cook a cooking material in the cooking container by burning a mixed gas discharged from the plurality of burners,

the burner of the cooking stove is characterized in that,

an opening is formed in a tube end of the mixing tube on a side not connected to the burner main body, and a fuel gas flowing in from the opening is mixed with air to form a mixed gas,

the burner has a flame guide having: a collision wall provided at a position facing the opening of the mixing pipe, the collision wall being configured to collide with a flame of the mixed gas when the flame is ejected from the opening; and an induction wall extending from the upper and both side positions toward the direction of the burner body with respect to the collision wall, the induction wall inducing the flame colliding with the collision wall toward the direction of the burner body.

2. The cooktop burner of claim 1,

the flame guide is in a shape with an open lower surface.

3. The cooktop burner of claim 1 or 2,

the collision wall of the flame guide is formed in parallel with the opening portion of the end portion of the mixing pipe.

Technical Field

The present invention relates to a range burner that heats and cooks a cooking object in a cooking container by burning a mixed gas of a fuel gas and air.

Background

A range burner for heating and cooking a cooking object in a cooking container by burning fuel gas is widely used. The range burner comprises: a burner body to which a mixed gas of a fuel gas and air is supplied; a burner head portion having a circular ring shape, a plurality of burner ports being formed in a radial shape on a lower end surface thereof, and a plurality of burner ports being formed between the burner head portion and a mounting surface of the burner body when the burner head portion is mounted on the burner body; a mixing pipe having one end connected to the burner body and an opening formed at the other end; and an injection nozzle that injects the fuel gas toward an opening portion of the mixing pipe. When the fuel gas is injected from the injection nozzle toward the opening, the injected fuel gas flows into the mixing pipe while entraining ambient air, and the fuel gas and the air are mixed in the mixing pipe and supplied to the burner main body. The mixed gas of the fuel gas and the air supplied to the burner body is ejected to the outside from a plurality of flame ports formed between the burner body and the burner head, and when the mixed gas is ignited, the flame generated is spread to the flame ports located nearby. As a result, the mixed gas starts to burn at all the burners, and the cooked object can be heated and cooked.

In the above-described cooktop burner, if cooking occurs during cooking, the cooking liquor may adhere to the burner head and the burner body and block the fire hole. In addition, if the boiled soup spreads to a distant burner along the mounting surface of the burner body, a plurality of burners may be clogged. The phenomenon that the boiled soup spreads to a distant fire hole along the carrying surface is particularly easy to occur when the concentration of the boiled soup is low. Therefore, even when water is boiled, a plurality of fire holes may be clogged when the water boils over. Further, when the plurality of burner ports are closed in a state where the mixed gas is burned in the burner, a phenomenon (referred to as reverse blowing) may occur in which the flame flows back into the mixing pipe of the burner and is ejected from the opening portion at the end portion of the mixing pipe. When the back-blow occurs, the flame emitted from the back-blow burns the inner side of the gas range (for example, the back side of the top plate), and as a result, the gas range may be damaged.

Therefore, a technique has been proposed in which a temperature sensor is mounted in advance in the vicinity of an opening at the end of a mixing pipe of a burner, and when an increase in temperature is detected, it is determined that flame is ejected from the opening due to reverse injection, and the supply of fuel gas is stopped (patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2003-028428

Disclosure of Invention

Problems to be solved by the invention

However, in order to cope with the reverse injection, a temperature sensor is mounted, the occurrence of the reverse injection is detected based on an output of the temperature sensor, and the supply of the fuel gas is stopped when the reverse injection is detected, and such an operation stops the supply of the fuel gas, which results in the flame extinction at the fire hole. Therefore, there is a complicated problem in that: when the user wants to continue cooking, the user needs to perform an operation of re-ignition after removing the blockage of the burner by cleaning or the like.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a range burner which can eliminate a back spray and continue cooking without performing a re-ignition operation.

Means for solving the problems

In order to solve the above problems, the burner of the range of the present invention adopts the following structure. That is to say that the first and second electrodes,

a cooktop burner, comprising: a mixing pipe in which a mixed gas of fuel gas and air is formed; a burner main body to which a mixed gas is supplied from the mixing pipe and on the upper surface of which an annular mounting surface is formed; and a burner head portion having a plurality of burner grooves formed in a lower end surface of a cylindrical wall, the burner head portion being placed on a placement surface of the burner body to form a plurality of burners opened in an outer peripheral side surface of the cylindrical wall, and the burner head portion being configured to heat and cook a cooking material in the cooking container by burning a mixed gas discharged from the plurality of burners,

the burner of the cooking stove is characterized in that,

an opening is formed in a tube end of the mixing tube on a side not connected to the burner main body, and a fuel gas flowing in from the opening is mixed with air to form a mixed gas,

the burner has a flame guide having: a collision wall provided at a position facing the opening of the mixing pipe, the collision wall being configured to collide with a flame of the mixed gas when the flame is ejected from the opening; and an induction wall extending from the upper and both side positions toward the direction of the burner body with respect to the collision wall, the induction wall inducing the flame colliding with the collision wall toward the direction of the burner body.

In the range burner of the present invention, a mixed gas of fuel gas and air is formed inside the mixing pipe, and the mixed gas is jetted and burned from a plurality of burner ports formed by surrounding a mounting surface of the burner body and a burner port groove of the burner head, thereby heating and cooking a cooking object in the cooking container. The end of the mixing pipe on the side not connected to the burner body is an opening, and fuel gas and air flow into the mixing pipe from the opening. However, when a plurality of fire holes are closed by soup or the like that is boiled during cooking, a phenomenon (that is, reverse blowing) occurs in which flame flows backward and is ejected from an opening of the mixing pipe. Therefore, in the burner of the present invention, the flame guide is mounted on one side of the opening of the mixing pipe. In the flame guide, a collision wall against which the flame ejected from the opening collides is provided at a position facing the opening, and an induction wall extending from positions above and on both sides of the collision wall in a direction in which the burner body is located is provided.

Thus, even if the plurality of fire holes are blocked by the boiled soup and the reverse flow occurs, the flame jetted from the opening collides with the collision wall to change the direction, and then the flame is guided in the direction of the burner body by the guide wall, thereby heating the burner body. As a result, the temperature of the mounting surface and the burner groove of the burner head rises, and the evaporation of the cooking liquor blocking the burner is promoted, so that the blockage of the burner can be eliminated to restore normal combustion, and the back spray can be naturally eliminated. Further, since the opening of the mixing pipe is surrounded by the collision wall and the guide wall of the flame guide, there is no risk that the back-blown flame damages the inside of the gas range. Even when the reverse injection occurs, the reverse injection can be eliminated without stopping the supply of the fuel gas to the burner (and thus in a state where cooking is continued). Therefore, when cooking is continued even after the occurrence of the back-blow, the following complicated operations are not required: after the cause of the back spray is eliminated by cleaning the burner slot or the like, the fuel gas is ignited again and the supply of the fuel gas is restarted.

In the above-described burner of the present invention, the flame guide may have a shape in which a lower surface is open.

In this case, air can be supplied from below the flame guide to the opening of the mixing pipe. Therefore, even if the flame guide is mounted, the amount of air supplied to the mixing pipe is not reduced, and therefore, a mixed gas in which the fuel gas and the air are mixed at an appropriate ratio can be generated in the mixing pipe.

In the above burner of the present invention, the collision wall of the flame guide may be formed parallel to the opening of the end portion of the mixing pipe.

Since the guide walls are formed above and on both sides of the collision wall, the air flowing into the opening of the mixing pipe is mainly supplied from below the flame guide. Therefore, if the collision wall provided at a position facing the opening of the mixing pipe is inclined such that the lower portion of the collision wall is close to the opening, the flow of air flowing into the opening of the mixing pipe is blocked, and it becomes difficult to supply air at an appropriate flow rate into the mixing pipe. Conversely, if the collision wall is inclined so that the lower portion of the collision wall is away from the opening of the mixing pipe, when the flame is ejected from the opening by the reverse blowing, the flame colliding with the collision wall is induced downward by the collision wall. As a result, there is a risk that the flame leaks out of the flame guide and damages the gas range. In contrast, if the collision wall of the flame guide is formed parallel to the opening of the mixing pipe, the flow of air supplied to the mixing pipe is not obstructed, and when the back jet occurs, the flame colliding with the collision wall changes its direction and can be reliably guided to the burner body side by the guide wall. Therefore, the flame can be prevented from leaking out of the flame guide and damaging the gas range.

Drawings

Fig. 1 is an explanatory view showing a state in which a burner 10 of the present embodiment is mounted on a gas range 1.

Fig. 2 is a sectional view illustrating the structure of the burner 10 by cutting the burner 10 in a longitudinal direction at the position of the temperature sensor 18.

Fig. 3 is an explanatory diagram showing an appearance shape of the flame guide 30 of the present embodiment.

Fig. 4 is an explanatory view showing the reason why the reverse blowing is naturally eliminated by the flame guide 30 of the present embodiment.

Fig. 5 is an explanatory diagram showing the reason why the collision wall 31 is formed in parallel with the opening 15a of the mixing pipe 15 in the flame guide 30 of the present embodiment.

Fig. 6 is an explanatory diagram showing an external shape of the flame guide 30 according to modification 1.

Fig. 7 is an explanatory diagram showing an external shape of the flame guide 30 according to modification 2.

Description of the reference numerals

1. A gas range; 2. a top plate; 2a, an opening for a burner; 3. a fire chaplet; 4. a burner ring; 10. a range burner; 11. a burner head; 11a, a cylindrical wall; 11b, a support cylinder; 11c, a main fire hole groove; 11d, auxiliary fire hole grooves; 12. a main fire hole; 13. an auxiliary fire hole; 14. a burner body; 14a, an outer peripheral wall; 14b, an inner circumferential wall; 14c, a burner body chamber; 14d, a carrying surface; 15. a mixing tube; 15a, an opening; 16. a spark plug; 17. a burner cap; 18. a temperature sensor; 19. a support column; 20. a gas pipe; 21. a spray nozzle; 30. a flame guide; 31. a collision wall; 31a, a through hole; 32. an upper wall; 33. side walls.

Detailed Description

Fig. 1 is an explanatory view showing a state in which a burner 10 of the present embodiment is mounted on a gas range 1. As shown in the drawing, the gas range 1 has a top plate 2 made of glass or metal, and a burner opening 2a (see fig. 2) described later is formed in the top plate 2. The range burner 10 is mounted in a state in which the upper portion of the range burner 10 protrudes from the burner opening 2 a. Further, the fire chaplet 3 is placed on the top plate 2 so as to surround the range burner 10 protruding from the burner opening 2a, and a cooking vessel such as a pot can be placed on the fire chaplet 3, whereby the bottom of the pot can be heated by the range burner 10. Furthermore, the gap between the burner opening 2a and the burner 10 is closed by the burner ring 4.

The range burner 10 includes a burner body 14, an ignition plug 16, a burner head 11 placed on the burner body 14, and the like. Further, a wide annular burner cap 17 is attached to the upper portion of the burner head 11, and a temperature sensor 18 is attached to the upper portion of the temperature sensor 18 in a state of protruding from a through hole in the center of the burner cap 17. As described later, a mixed gas obtained by mixing the fuel gas and the air is supplied into the burner main body 14. Further, a plurality of vertically long main ports 12 and a plurality of auxiliary ports 13 having an opening area smaller than that of the main ports 12 are opened in the cylindrical outer peripheral side surface of the burner head 11. Further, although the main ports 12 and the auxiliary ports 13 are alternately formed in the example shown in fig. 1, they are not necessarily alternately formed. The auxiliary ports 13 may be formed, for example, every time a predetermined plurality of main ports 12 are formed in series. The mixture gas in the burner main body 14 is ejected from the main burner 12 and the auxiliary burner 13, and the mixture gas is ignited by the ignition plug 16, whereby combustion is started. The burner cover 17 has a function of preventing soup to be boiled and spilled from the cooking utensil from entering the inside of the gas range 1 when the cooking utensil is boiled and spilled during heating. The upper end surface of the temperature sensor 18 is in contact with the bottom surface of the cooking container, and the temperature of the cooking container can be measured.

Fig. 2 is a sectional view illustrating the structure of the burner 10 by cutting the burner 10 in a longitudinal direction at the position of the temperature sensor 18. The burner body 14 of the cooktop burner 10 is formed by assembling 2 press-formed metal plates in an airtight state while opposing them. One metal plate forms an outer peripheral wall 14a, the other metal plate forms an inner peripheral wall 14b, and a burner body chamber 14c is formed between the outer peripheral wall 14a and the inner peripheral wall 14 b. A mixing pipe 15 is connected to a side surface of the burner main body chamber 14 c.

The mixing pipe 15 is formed by assembling a part of the metal plate forming the outer peripheral wall 14a and a part of the metal plate forming the inner peripheral wall 14b in an airtight state so as to face each other, and a pipe end of the mixing pipe 15 on a side not connected to the burner main body chamber 14c is an opening 15 a. The burner body 14 is formed with an annular mounting surface 14d by bending an upper end portion of the outer peripheral wall 14a inward. The burner head 11 is mounted on the mounting surface 14 d.

The burner head 11 is a substantially annular member formed by forging, die casting, or the like using a metal material such as an aluminum alloy, brass, or the like, and a cylindrical support tube 11b is provided to protrude downward from an inner edge portion of the annular member. A cylindrical wall 11a is provided to protrude downward from the outer edge of the annular shape. A plurality of burner grooves, which will be described later, are radially formed in the lower end surface of the cylindrical wall 11 a. The burner grooves are formed in a state in which a deeply bored burner groove (hereinafter referred to as a main burner groove 11c) and a shallowly bored burner groove (hereinafter referred to as an auxiliary burner groove 11d) are mixed. In the burner head 11 having such a shape, the cylindrical wall 11a of the burner head 11 is placed on the placement surface 14d of the burner body 14 in a state where the support cylinder 11b of the burner head 11 is fitted to the inner circumferential wall 14b of the burner body 14. Then, a portion of a passage surrounded by the mounting surface 14d and the main burner grooves 11c bored in the lower end surface of the cylindrical wall 11a, which portion opens on the outer peripheral side surface of the cylindrical wall 11a, becomes the main burner 12. Further, a portion of the passage surrounded by the auxiliary fire hole groove 11d and the mounting surface 14d, which portion opens on the outer peripheral side surface of the cylindrical wall 11a, becomes the auxiliary fire hole 13. Fig. 2 shows a cross section of the cylindrical wall 11a in enlarged form at a portion of the main burner groove 11c and a portion of the auxiliary burner groove 11 d.

A wide annular burner cap 17 is attached to the upper portion of the burner head 11 by an attachment fitting not shown. An upper portion of the cylindrical temperature sensor 18 protrudes from a through hole formed in a center position of the burner cover 17. The temperature sensor 18 is attached to the upper end of a support column 19, the support column 19 penetrates the center of the support tube 11b of the burner head 11, and the upper end of the temperature sensor 18 protrudes from the upper surface of the firebar 3 when the cooking container is not placed on the firebar 3. Further, the upper portion of the burner main body 14 (the portion where the mounting surface 14d is formed) is in a state of protruding from the burner opening 2a opened in the top plate 2, and the gap between the burner main body 14 and the burner opening 2a is closed by the annular burner ring 4.

A gas pipe 20 for supplying the fuel gas is provided at a position facing the opening 15a at the end of the mixing pipe 15, and an injection nozzle 21 for injecting the fuel gas is attached to the tip of the gas pipe 20. When the fuel gas is injected from the injection nozzle 21 toward the inside of the mixing pipe 15, the injected fuel gas flows into the inside of the mixing pipe 15 while entraining ambient air by the injector effect, and the fuel gas and the air are mixed in the inside of the mixing pipe 15 to form a mixed gas. The gas mixture thus formed passes through the burner main body chamber 14c in the burner main body 14, is then discharged from the main burner ports 12 and the auxiliary burner ports 13, and is ignited to start combustion.

Further, the flame guide 30 is provided at a position outside the opening 15a as viewed from the mixing pipe 15 in a state of surrounding the opening 15a with a gap from the opening 15 a. The flame guide 30 is a metal plate member, and the flame guide 30 is provided with a collision wall 31 parallel to the opening 15a of the mixing pipe 15 at a position facing the opening 15a, and an upper wall 32 extending from the upper edge of the collision wall 31 in the direction in which the burner main body 14 is located. Further, side walls 33 are provided to extend from both side edges of the collision wall 31 in the direction in which the burner main body 14 is located. In the present embodiment, the upper wall 32 and the side walls 33 correspond to "inducing walls" in the present invention.

Fig. 3 is an explanatory diagram showing an external shape of the flame guide 30 in a state where the flame guide 30 is viewed from a direction indicated by an arrow P in fig. 2. In the flame guide 30 as described above, the collision wall 31 is provided at a position facing the opening 15a of the mixing pipe 15, and the upper end of the collision wall 31 is horizontally bent, thereby forming the upper wall 32. Then, both ends of the bent collision wall 31 are bent downward to form the side walls 33, and the side walls 33 and the collision wall 31 are in contact with each other without a gap. Further, a slit-shaped through hole 31a is formed in the collision wall 31 in a range from the lower end to the center. Therefore, the gas pipe 20 can be inserted into the through hole 31a, and as a result, the fuel gas can be injected into the mixing pipe 15 with the injection nozzle 21 at the tip end of the gas pipe 20 facing the opening 15 a.

As such, the burner 10 of the present embodiment is provided with the flame guide 30 in order to: even when the reverse injection occurs in the burner 10 and the flame is injected from the opening 15a of the mixing pipe 15, the reverse injection can be naturally eliminated without any special operation while avoiding damage to the inside of the gas range 1. The reason why such an effect can be achieved is as follows.

Fig. 4 is an explanatory diagram conceptually showing the movement of the flame jetted from the opening 15a of the mixing pipe 15 when the back jet occurs. The arrows of the thick one-dot chain line in the figure indicate the movement of the flame ejected from the opening 15 a. As shown in the figure, since the collision wall 31 is present at a position facing the opening 15a, the flame jetted from the opening 15a collides with the collision wall 31 to change its direction.

Here, as described above with reference to fig. 2 and 3, the flame guide 30 has a shape in which the upper wall 32 is formed above the collision wall 31, and the side walls 33 of the flame guide 30 are formed in the left-right direction of the collision wall 31, but the lower surface of the flame guide 30 is open. Therefore, before the back spray occurs, air mainly flows into the opening 15a of the mixing pipe 15 from below the flame guide 30. Arrows shown by thick broken lines in fig. 4 conceptually indicate the flow of air from below the flame guide 30 toward the opening 15 a.

When the reverse blowing is performed in a state where the air flowing from below toward the opening 15a is formed in this manner, the flame blown from the opening 15a collides with the collision wall 31, and the flame after the collision is directed mainly upward and leftward and rightward without being directed downward. Further, an upper wall 32 is provided above the collision wall 31 so as to extend in the direction in which the burner body 14 is located, and side walls 33 are provided on both sides of the collision wall 31 so as to extend in the direction in which the burner body 14 is located. Therefore, the flame that has collided with the collision wall 31 and changed in the upward direction is induced in the direction of the burner main body 14 by the upper wall 32. Further, flames that collide with the collision wall 31 and change their orientations to the left and right directions are induced in the direction of the burner main body 14 by the side walls 33 provided on both sides of the collision wall 31. As a result, the flame jetted from the opening 15a travels along the mixing pipe 15 in the direction of the burner main body 14. In fig. 4, the arrows with one-dot chain lines indicate the case where the flame colliding with the collision wall 31 travels in the direction in which the burner main body 14 is located along the mixing pipe 15.

In the stove burner 10 of the present embodiment, when the back-blow occurs, the flame discharged from the opening 15a is guided in the direction of the burner main body 14 by the flame guide 30. Therefore, the mixing pipe 15 and the burner main body 14 are heated by the flame, the mounting surface 14d of the burner main body 14 is heated, and the burner ports 11c and 11d are also heated by the heat conduction from the mounting surface 14 d. As a result, the evaporation of the clogged cooking liquor or the like is promoted at the main fire hole 12 and the auxiliary fire hole 13, and the fire holes are opened to return to a normal combustion state, so that the back spray can be eliminated.

Of course, even if the reverse flame is induced in the direction of the burner body 14, the boiled soup or the like blocking the main burner 12 and the auxiliary burner 13 does not evaporate immediately. Therefore, the main fire hole 12 and the auxiliary fire hole 13 are blocked by the boiled soup or the like for a short period after the occurrence of the back-blow, and the back-blow continues to occur. However, as shown in fig. 2 and 3, since the flame guides 30 are provided so as to cover the front, upper, and left and right sides of the opening 15a of the mixing pipe 15, even if flame is ejected from the opening 15a, the inside of the gas range 1 (for example, the back side of the top plate 2) is not burned by the flame, and the gas range 1 is not damaged. On the other hand, the flame emitted from the opening 15a is guided in the direction of the burner body 14 by the flame guide 30, and as a result, evaporation of the boiled soup or the like blocking the main fire hole 12 and the auxiliary fire hole 13 is promoted. Therefore, the clogging of the main burner 12 and the auxiliary burner 13 can be eliminated in a short time, and therefore, the reverse blowout can be eliminated.

As described above, in the burner 10 of the present embodiment, even when the reverse blowout occurs, the reverse blowout can be eliminated without taking any special measures, and the inside of the gas range 1 is not damaged. In addition, even if the back spray occurs, the back spray can be eliminated in a state of continuing cooking, so that the following complicated operations are not required: when the reverse injection occurs, the supply and combustion of the fuel gas are temporarily stopped, the burner slot is cleaned, and the like to eliminate the reverse injection, and then the fuel gas is ignited again to resume the supply of the fuel gas to continue cooking.

In addition, reverse injection does not require all ports to be plugged, and occurs when a certain percentage of ports are plugged. The certain ratio may be about 8. Conversely, if the state is changed from the state in which the reverse blowout has occurred, and the state is returned to the state in which the ports of about 2 (about 3 for safety) out of all the ports are not blocked, the reverse blowout can be eliminated.

In addition, in the present embodiment, the collision wall 31 of the flame guide 30 is formed in parallel with the opening portion 15a of the mixing pipe 15. The reason for this is as follows. Fig. 5 is an explanatory diagram of a case where the collision wall 31 of the flame guide 30 is formed to be inclined with respect to the opening 15a of the mixing pipe 15. Fig. 5 (a) shows a case where the collision wall 31 is provided obliquely so that the lower portion thereof is close to the opening 15 a. Since the air flowing into the mixing pipe 15 from the opening 15a is mainly supplied from below as described above, if the collision wall 31 is inclined so that the lower side thereof approaches the opening 15a as shown in fig. 5 (a), the flow of the air toward the opening 15a is blocked. Therefore, in the case where the back-blowing does not occur, the air hardly flows into the mixing pipe 15, and therefore, there is a risk of preventing the mixed gas from being generated in the mixing pipe 15.

Fig. 5 (b) shows a case where the collision wall 31 is provided obliquely so that the lower portion thereof is away from the opening 15 a. When collision wall 31 is inclined at an angle such that the lower portion of collision wall 31 is spaced apart from opening 15a as shown in fig. 5 (b), air is easily supplied to opening 15 a. Therefore, there is no risk of preventing the mixed gas from being generated in the mixing pipe 15 without causing the back blow. On the other hand, since the collision wall 31 is inclined so that the lower portion thereof is spaced apart from the opening 15a, when the reverse blow occurs, the flame blown out from the opening 15a is guided downward by the inclined collision wall 31. As a result, the flame may leak outside the flame guide 30 beyond the collision wall 31, and may damage the inside of the gas range 1.

In contrast, in the present embodiment, the collision wall 31 of the flame guide 30 is formed parallel to the opening 15a of the mixing pipe 15, and therefore the collision wall 31 does not obstruct the flow of air from below toward the opening 15 a. Therefore, without causing the back-blow, a mixed gas in which the fuel gas and the air are mixed at an appropriate ratio can be formed in the mixing pipe 15. On the other hand, in the case where the reverse blowing occurs, the flame colliding with the collision wall 31 is guided by the collision wall 31, and there is no risk of leakage to the outside of the flame guide 30. In order to obtain the above-described effects, it is not necessary that the collision wall 31 be completely parallel to the opening 15a, and it has been experimentally confirmed that the same effects can be obtained even if the angle formed with respect to the opening 15a is within a range of ± 5 degrees from the parallel state.

In the flame guide 30 of the present embodiment described above, the left and right side walls 33 are formed parallel to each other. However, the interval between the left and right side walls 33 may be narrowed in the direction in which the burner main body 14 is located. In the flame guide 30 of modification 1 illustrated in fig. 6, as indicated by diagonal lines in the drawing, the upper wall 32 and the side walls 33 extend toward the burner body 14, and the distance between the left and right side walls 33 is formed to be narrower in the extending portion toward the direction in which the burner body 14 is located. In this way, after the direction of the flame colliding with the collision wall 31 is changed to the direction in which the burner body 14 is located by the upper wall 32 and the side walls 33, the flame is moved toward the center by the extension portions of the left and right side walls 33. Therefore, the flame can efficiently heat the burner main body 14, and the mounting surface 14d of the burner main body 14, the main flame ports 11c and the auxiliary flame ports 11d of the burner head 11 can be quickly heated, so that the back spray can be quickly eliminated.

In the flame guide 30 of the present embodiment, the above-described structure in which the upper wall 32 is formed in a planar shape has been described. However, the upper wall 32 of the flame guide 30 may be formed in an upwardly convex shape. Fig. 7 illustrates the flame guide 30 of modification 2 in which the upper wall 32 is formed in an upward convex shape. In the example shown in fig. 7 (a), the upper wall 32 is formed in a curved surface shape protruding upward, and in the example shown in fig. 7 (b), the upper wall 32 is formed in a mountain shape protruding upward. In the flame guide 30 of the modification 2, when the flame ejected from the opening 15a and colliding with the collision wall 31 is changed in direction in which the burner body 14 is located by the upper wall 32, or when the flame is caused to travel toward the burner body 14 by the upper wall 32, the flame is moved toward the center by the upper wall 32 having a convex shape. Therefore, in modification 2, as in modification 1, the burner main body 14 can be efficiently heated by the flame, and therefore, the reverse flow can be quickly eliminated.

Although the range burner 10 of the present embodiment and various modifications has been described above, the present invention is not limited to the above-described embodiment and various modifications, and can be implemented in various ways within a range not departing from the gist thereof.