JP2002333109A - Burner and cooking appliance using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a burner capable of realizing an excellent state of combustion and a high thermal efficiency. SOLUTION: The outer peripheral part of a molded body 6 of a burner port is constituted of a slant surface 9 slanted downward in the direction of the outer periphery, while a burner port groove 10 is opened in the slant surface 9, and the upper end face of the burner port groove 10 and the slant surface 9 are made to intersect each other at an acute angle α. Since the opening area of the burner port groove on the outer peripheral surface side can be made larger than that on the inner peripheral surface side in this constitution, it is possible to lessen the resistance to passing of premixed gas and to maintain excellent combustion and also to direct a flame upward by the slant surface 9. Thus, the high thermal efficiency can be ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a burner using gas or the like as a fuel and a stove using the burner as a heating source.

[0002]

2. Description of the Related Art Conventionally, this type of burner is disclosed in Japanese Unexamined Patent Publication No. 9-29.
There was one described in Japanese Patent No. 2108.
As shown in FIG. 7, a flame port molding 82 is fitted to the upper part of a mixing tube 81. The flame port molded body 82 has a large flame port 84 and a small flame port 85 alternately arranged at a constant upward inclination angle on the outer peripheral edge thereof. A flame port 87 is provided to minimize the flame formed near the virtue support claw 86 to prevent the main flame from interfering with the virtue support claw 86, and to reduce combustion and decrease thermal efficiency. It was to suppress.

[0003]

However, in the above-mentioned conventional burner, the premixed gas which has flowed into the flame port molding 82 from the mixing pipe 81 is once diffused uniformly in the diffusion section 83 and then ejected from the main flame port. The main flame opening is provided at a constant upward inclination angle, whereas the diffusion portion 83 is formed as a substantially annular concave portion. It depends not only on the inclination angle and the ejection speed of the premixed gas, but also on the outflow direction of the premixed gas from the diffusion section 83 to the main flame opening. Therefore, in the case of a strong combustion amount, a downward or sideward velocity vector is generated when flowing through the diffusion portion 83 and into the main flame opening, so that the flame ejection angle becomes shallow and improvement in thermal efficiency over a certain level can be expected. However, there was a problem that heat dissipation to the surroundings was large to some extent.

Further, at the fitting portion between the main flame port and the mixing pipe 81, since the upper inclined angle of the main flame port and the upper inclined angle of the burner main body are substantially the same, the premixed gas passes through the main flame port. When the flame is formed and the temperature of the flame molded body 82 rises, the passage resistance increases and the amount of premixed air gradually decreases to reduce a small amount of yellow. There was also a problem that combustion was partially deteriorated, such as generation of a flame.

The present invention solves the above-mentioned conventional problems. Even if the temperature of the molded body of the flame port rises, the decrease in the amount of premixed air is reduced to ensure a good combustion state, and at the same time, the flame is raised. To achieve high thermal efficiency by suppressing heat dissipation to the surroundings.

[0006]

In order to achieve the above-mentioned object, a burner according to the present invention is provided with a flame port groove which is circumferentially opened at a constant upward inclination angle on an outer peripheral portion of a flame port molding. In addition, the opening area on the outer peripheral side of the flame opening is larger than the opening area on the inner peripheral side.

With the above arrangement, when the premixed gas passes through the flame opening, the passage area in the traveling direction of the premixed gas increases, and the passage resistance of the premixed gas decreases as approaching the vicinity of the outlet side of the flame opening. Therefore, even if the temperature of the flame port molded body rises due to combustion in the flame port molded body, a decrease in the premixed air amount can be suppressed. For this reason, compared to the conventional case where the opening area of the flame port is the same on the outer peripheral side and the inner peripheral side, even if the opening area of the flame port on the inner peripheral side is reduced, the yellow There is no generation of flame. Conversely, flashback can be suppressed even when a fuel gas having a fast burning rate is used.

[0008] Therefore, a good combustion state with a short flame length can be ensured, and the distance to the object to be cooked such as a pan can be reduced, so that high thermal efficiency can be realized.

[0009]

According to the first aspect of the present invention, a flame port molding is mounted on a burner main body, an air port is provided at the center of the flame port molding, and a fixed upward inclination angle is provided on an outer peripheral portion. In the configuration, a flame opening groove opened in the circumferential direction is provided, and the opening area on the outer periphery side of the flame opening in the flame arrangement portion is larger than the opening area on the inner periphery side. Even if the temperature rises, the decrease in the premixed air amount is reduced, and the occurrence of yellow flame and the like is suppressed even after the combustion time elapses, and at the same time, the flashback is suppressed and a good combustion state with a short flame length can be maintained. It is possible to shorten the distance from the object to be cooked such as a pot, and high thermal efficiency can be realized.

According to a second aspect of the present invention, the outer peripheral portion of the flame port molded body is constituted by an inclined surface which is inclined downward in the outer peripheral direction, and a flame groove is opened in the inclined surface, and an upper end surface of the flame groove is formed. And the inclined surface intersect at an acute angle, so that the opening area of the flame opening groove on the outer peripheral surface side can be made larger than that on the inner peripheral surface side, thereby reducing the passage resistance of the premixed gas and achieving good combustion. Since it is possible to maintain and simultaneously raise the flame on the inclined surface, high thermal efficiency can be ensured.

According to a third aspect of the present invention, the outer peripheral portion of the flame port molded body is constituted by an inclined surface which is inclined downward in the outer peripheral direction, and a flame port groove is opened in the inclined surface. By bending the upper end of the flame groove on the outer peripheral side upward, the opening area on the outlet side of the flame groove increases to maintain a good combustion state, and at the same time, the upper bent portion of the flame outlet , The flame can be directed upward, and high thermal efficiency can be secured.

According to a fourth aspect of the present invention, the passage resistance of the premixed gas is reduced by gradually increasing the width of the flame groove from the inner peripheral side to the outer peripheral side of the flame arrangement portion. Good combustion can be maintained by gradually decreasing toward the outlet side of the groove, and high thermal efficiency can be secured.

According to a fifth aspect of the present invention, the angle of inclination of the upper end surface of the flame groove is increased by the angle of inclination of the lower end surface of the flame groove at the fitting portion between the flame arrangement portion and the burner body. By making it larger, the passage resistance of the premixed gas is gradually reduced to the outlet side of the flame groove to maintain good combustion, and at the same time, the flame is directed upward by the upward inclination of the flame groove, ensuring high thermal efficiency Can be.

According to a sixth aspect of the present invention, the broth shield is provided above the flame opening molded body via a gap, so that the air flowing in from the air passage collides with the broth shield to uniformly generate a flame. It can diffuse into the inside, promote combustion, shorten the flame length and secure high thermal efficiency, and at the same time, prevent the juice from dropping into the flame groove.

According to a seventh aspect of the present invention, a stepped portion provided around the opening of the top plate and a mounting portion are provided on a frame which shields the stepped portion and inclines the inner periphery downward. With the composed virtues,
The burner according to any one of claims 1 to 6, which is provided in the opening, and a saucer provided in the opening, and an air port is provided in a side surface of the stepped portion or the juice receiving tray. The air flowing from the air passage of the flame port molded body passes through the gap between the broth shield and the flame port molded body, and is effectively diffused into the flame. Since the flow is regulated by the inclination of the frame body and reaches the flame port arrangement portion while cooling the top plate and the like, the combustion is promoted, the flame is shortened, and a flame directed upward can be realized. Therefore,
Even if foods such as pots are brought close to the burner, the rise of CO can be suppressed, and the step between Gotoku and the top of the top plate is reduced to ensure a configuration with fewer steps overall, while at the same time achieving high thermal efficiency and energy saving. Can be secured.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) A burner according to Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a sectional view of a burner according to the present embodiment, and FIG. 2 is a side view showing an appearance of the burner.

In FIG. 1, reference numeral 1 denotes a burner main body made of a heat-resistant metal such as stainless steel.
And a substantially annular diffusion chamber 5 formed by an inner peripheral wall 3 and an outer peripheral wall 4 penetrating vertically.

Reference numeral 6 denotes a flame port molded body formed into a substantially truncated conical shape by brass forging, aluminum ingot casting, ceramics molding, or the like. An opening cylinder 7 fitted to the inner peripheral wall 3 is provided at the center. To form an air passage 8 penetrating vertically. The lower surface side of the upper and outer peripheral portions of the flame port molding 6 is
The diffusion chamber 5 is substantially in close contact with the france portion located above the outer peripheral wall 4 of the diffusion chamber 5, and the outer peripheral surface portion thereof is formed as an inclined surface 9 which is inclined downward from the upper part to the lower part in the outer peripheral direction.

On the inclined surface 9 of the above-described molded body 6, a large number of flame grooves 10 are provided radially and upward from the center, and the upper end surface of the flame groove 10 and the inclined surface 9 intersect at an acute angle α. A portion where the flame groove 10 opens to the inclined surface 9 is defined as a flame arrangement portion 11. Also, the flame outlet groove 11 is
Regions 13 having a lower flame port arrangement density, in which auxiliary flame ports 12 having a smaller opening area are disposed, are provided at regular intervals.

On the other hand, the upper surface of the flame port molding 6 is
The inner peripheral inclined surface 14 is inclined downward toward the center of the flame outlet molded body 6, and the flame outlet arrangement portion 11 of the flame outlet molded body 6 is provided above the flame outlet molded body 6.
A plurality of struts 1 rising from the upper end face of the flame port molded body 6 through a gap 16 communicating with the air passage 8 through a boiling shield 15 having an outer diameter equal to or larger than the maximum outer diameter of about 1 to 2 mm.
7, the flame outlet molded body 6 is connected.

As described above, the burner 18 is formed by mounting the flame port molded body 6 fitted with the broth shielding body 15 on the burner main body 1.

Next, the operation and operation will be described. The premixed gas is formed by mixing the fuel gas ejected into the mixing pipe 2 with the premixed air (primary air) sucked at the same time. Thereafter, the flame 19 is uniformly diffused into the diffusion chamber 5, dispersed according to the opening area of the flame opening groove 10 and the auxiliary flame opening 12, ignited by a suitable ignition means (not shown), and the flame 19 is formed by the flame opening 11. Form. At this time, since the upper end face of the flame groove 10 and the inclined surface 9 intersect at an acute angle α, that is, the opening area of the flame groove 10 on the outer peripheral surface side is made larger than that on the inner peripheral surface side, the passage resistance of the premixed gas is reduced. To a certain extent to maintain good combustion, and at the same time
9 can be turned up.

On the other hand, the first secondary air flow 20 flowing from the air passage 8 as an ascending air flow passes through the gap 16 between the broth shield 15 and the upper surface of the flame port molding 6, and the flame port arrangement. Immediately above the installation portion 11, it is effectively diffused into the flame 19. At the same time, the second secondary air flow 21 is applied to the outer peripheral wall 4 of the flame port molding 6.
From the surroundings into the flame 19. Therefore, flame 1
9 is sandwiched between the first secondary air flow 20 and the second secondary air flow 21 to promote combustion and shorten the flame.

Further, since several regions 13 having a low flame hole density are provided in the flame hole arrangement portion 11, the flames in this region are mainly small-scale flames for securing a fire transfer. Thus, the interference between the adjacent flames 19 is suppressed, so that a shorter flame upward flame 19 can be realized.

Therefore, even if food such as a pot is brought close to the burner, the rise of CO can be suppressed, and as a result not only high thermal efficiency can be ensured, but also in the case where boiling occurs, the upper part of the broth shield 15 can be prevented. And falls down from the outer peripheral portion thereof, so that it does not enter the air passage 8 or clog the flame opening groove 10.

(Embodiment 2) A burner according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 3 is a sectional view of the burner of the present embodiment.

The difference between the burner 30 of the present embodiment and the first embodiment is that the upper end of the flame port groove 33 of the flame port arranging portion 32 of the flame port molding 31 is substantially perpendicular to the inclined surface 34, This is a point that the outer peripheral end side of the upper end of 33 is bent upward.

The components having the same reference numerals as in the first embodiment have the same structure, and the description is omitted.

Next, the operation and function will be described. The upper end of the flame groove 33 on the outer peripheral end side of the flame arrangement portion 32 is bent upward, so that the opening on the outlet side of the flame groove 33 is opened. The area can be increased and the resistance to the passage of the premixed gas can be reduced to maintain a good combustion state, and at the same time, the flame can be directed upward at the upper bent portion of the outlet groove 33 on the outlet side. Therefore, high thermal efficiency can be secured.

Third Embodiment A burner according to a third embodiment of the present invention will be described with reference to FIG. FIG. 4 is a bottom view of the burner of this embodiment.

The difference between the burner 40 of the present embodiment and the second embodiment is that the burner groove 43 is gradually increased from B to A from the inner peripheral side to the outer peripheral side of the flame port arrangement portion 42. It is.

The components having the same reference numerals as in the second embodiment have the same structure, and the description will be omitted.

Next, the operation and the operation will be described.
By gradually increasing the groove width from B to A, the passage resistance of the premixed gas is gradually reduced toward the outlet side of the flame opening groove 43,
Good combustion can be maintained by holding the flame that has been shortened. Therefore, high thermal efficiency can be secured.

Embodiment 4 A burner according to Embodiment 4 of the present invention will be described with reference to FIG. FIG. 5 is a sectional view of the burner of the present embodiment.

The burner 50 of this embodiment is different from that of the second embodiment in that the upper slope of the upper end surface of the flame groove 53 at the fitting portion between the flame 52 and the burner body 1 of the molded body 51. β
Is larger than the upper inclination angle γ of the lower end face of the flame opening groove 53.

The components having the same reference numerals as those of the second embodiment have the same structure, and the description is omitted.

Next, the operation and the operation will be described. By setting the upper inclination angle β of the upper end face of the flame groove 53 to be larger than the upper inclination angle γ of the lower end face of the flame groove 53, the passage resistance of the premixed gas is reduced. Is gradually reduced to the outlet side of the flame groove 53 to maintain good combustion. At the same time, the flame is directed upward and short due to the upward inclination of the flame groove 53, so that high thermal efficiency can be secured.

(Embodiment 5) An embodiment of a stove according to the present invention will be described with reference to FIG. FIG. 6 is a sectional view of the stove according to the present embodiment.

In the figure, the stove body 61 is dropped into the opening of the counter 62 and is placed on the periphery of the opening of the counter 62. Top plate 63 is stove body 6
1 is placed on the stove body 61 so as to cover the
Is in contact with the counter 62. The top plate 63 has an opening 66 in the form of a flange 65 provided with a substantially circular stepped portion 64. The flange 65 has a burner opening 67 in the center, and a number of long sides in the peripheral side surface. A juice receiving tray 69 having a hole-shaped air port 68 is placed, and the burner 30 in the second embodiment faces the burner opening 67.
The air port 68 may be provided on the side surface of the stepped portion 64 of the top plate 63.

On the other hand, the gotoku 70 is configured by arranging a plurality of mounting portions 72 on a donut-shaped frame 71 whose inner periphery is inclined downward, and the frame 71 is composed of a stepped portion 64 and a juice tray 69.
Is placed so as to shield the air port 68 from above.

The components having the same reference numerals as those of the second embodiment have the same structure, and the description is omitted.

Next, the operation and operation will be described. The premixed gas supplied to the burner 30 is jetted from the flame groove 33 and ignited by a suitable ignition means (not shown). Upward flame 73 at the bend on the exit side of
To form At this time, the first secondary airflow 20 flowing from the air passage 8 as an ascending airflow passes through the gap 16 between the broth shielding body 15 and the flame mouth molding 31 and has a tendency of an ascending airflow. It reaches just above the disposition portion 32 and diffuses effectively into the flame 73. At the same time, the air flowing through the air port 68 cools the lower surface of the top plate 63 and
The direction is rectified by the downward inclination of the inner periphery of the frame 71,
The water flows so as to lick the bottom surface of the juice receiving tray 69, and is diffused into the flame 73 as a second secondary air flow 74 from around the flame outlet arrangement portion 32 while suppressing the temperature rise of the juice receiving tray 69. Therefore, the flame 73 is sandwiched between the first secondary air flow 20 and the second secondary air flow 21, and is formed as a flame 73 whose combustion is promoted and the flame is shortened and directed upward.

Accordingly, a stove that achieves high thermal efficiency, secures energy saving, prevents the broth from entering into the flame opening groove 33, and can stably supply combustion air, and secures a configuration with a small level difference as a whole. Can be provided.

[0045]

As described above, according to the present invention, when the premixed gas passes through the flame opening groove, the passage resistance of the premixed gas decreases as approaching the vicinity of the outlet side of the flame opening groove. Therefore, a decrease in the premixed air amount can be suppressed. For this reason, compared to the case where the opening area of the flame port is the same on the outer peripheral side and the inner peripheral side, even if the opening area of the flame port groove on the inner peripheral side is reduced,
There is no occurrence of yellow flame or the like with the elapse of the combustion time, and conversely, even when a fuel gas having a high combustion rate is used, flashback can be suppressed.

Therefore, a good combustion state with a short flame length can be ensured, and the distance from the object to be cooked such as a pot can be reduced, so that high thermal efficiency can be realized.

[Brief description of the drawings]

FIG. 1 is a sectional view of a burner according to a first embodiment of the present invention.

FIG. 2 is a side view of the burner.

FIG. 3 is a sectional view of a burner according to a second embodiment of the present invention.

FIG. 4 is a bottom view of a burner according to a third embodiment of the present invention.

FIG. 5 is a sectional view of a burner according to a fourth embodiment of the present invention.

FIG. 6 is a sectional view showing an embodiment of the stove according to the present invention.

7A is a sectional view of a conventional burner, and FIG. 7B is an enlarged view of a main part of the burner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Burner main body 6, 31, 41, 51, 61 Flame mouth molded body 8 Air passage 9, 34 Inclined surface 10, 33, 43, 53 Flame mouth groove 11, 32, 42, 52 Flame mouth arrangement part 15 Boiled shield Reference Signs List 16 gap 18, 30, 40, 50 burner 63 top plate 64 stepping part 66 opening part 68 air port 69 soup tray 70 gotoku 71 frame body 72 mounting part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenzo Usui 1006 Kadoma Kadoma, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. (reference) 3K017 AA01 AB02 AB07 AC00 AD14

Claims (7)

[Claims] 1. A flame port molding is placed on a burner main body, an air passage is provided in the center of the flame port molding, and a flame port groove which is circumferentially opened at a constant upward inclination angle is provided on an outer peripheral portion. A burner, wherein the opening area on the outer peripheral side of the flame opening is larger than the opening area on the inner peripheral side. 2. An outer peripheral portion of a flame port molded body is constituted by an inclined surface which is inclined downward in an outer peripheral direction, and a flame groove is opened in said inclined surface, and an upper end face of the flame groove and the inclined surface are formed at an acute angle. 2. The burner according to claim 1, wherein the burners intersect. 3. An outer peripheral portion of the flame port molding is constituted by an inclined surface which is inclined downward in an outer peripheral direction, and a flame port groove is opened in the inclined surface, and the flame port groove on the outer peripheral side of the flame port arrangement portion is formed. 3. The burner according to claim 1, wherein the upper end is bent upward. 4. The burner according to claim 1, wherein the width of the flame groove is gradually increased from the inner peripheral side to the outer peripheral side of the flame arrangement portion. 5. The upper part of the upper surface of the flame groove is larger than the upper part of the lower surface of the flame groove at the fitting portion between the flame arrangement part and the burner main body. 5. The burner according to any one of items 4 to 5. 6. The burner according to any one of claims 1 to 5, wherein a boiling shield is provided above the flame port molded body through a gap. 7. A stepped portion provided around the opening of the top plate, a mounting member provided with a mounting portion provided on a frame that shields the stepped portion and has an inner periphery inclined downward, and an opening. A stove, comprising: the burner according to any one of claims 1 to 6; and a saucer provided in an opening, and an air port provided in a side surface of the stepped portion or the juice saucer.