JP7084298B2 - Flat burner - Google Patents

Description

The present invention relates to a flat burner having an elongated flame opening at the upper end.

This type of flat burner has a burner body consisting of a pair of side plates facing each other in the lateral direction, with the longitudinal direction of the flame opening as the front-back direction and the width direction of the flame opening as the lateral direction. A distribution chamber portion that guides the air-fuel mixture from the mixing tube portion to the flame opening portion is formed, and a rectifying member having a plurality of rectifying plates arranged side by side in the lateral direction is mounted in the flame opening portion. The rectifying member has contact portions at a plurality of front and rear positions where the rectifying plates are brought into contact with each other to divide the flame port flow path defined between the rectifying plates in the front-rear direction.

Here, conventionally, according to Patent Document 1, the shape of each contact portion between the rectifying plates on the inner side in the lateral direction, which defines the flame opening flow path near the center in the lateral direction of the flame opening portion, is an inverted triangle when viewed from the lateral direction. It is known that it is formed so as to become. In Patent Document 1, even if the air-fuel mixture flows into the flame port flow path near the center of the flaming port in the lateral direction in a state of being greatly tilted in the front-rear direction, the air-fuel mixture that collides with the inverted triangular portion of the contact portion flows in. It bounces off with a relatively large velocity component in the front-back direction opposite to the direction, and the flow of the air-fuel mixture is directed upward even in the flame port flow path part away from the contact part due to the flow of this bounce. There is a description that the flame formed on the mouth flow path can be prevented from being greatly tilted in the front-rear direction.

By the way, by forming each contact portion into an inverted triangle as described above, the width in the front-rear direction of the split flame port flow path divided by the contact portion of the flame port flow path near the center in the lateral direction of the flame port portion is increased. The split flame opening channel gradually contracts upward. Here, it is known that when the flow path gradually contracts, an damping effect on the velocity fluctuation of the fluid flowing through the flow path can be obtained.

However, in the case described in Patent Document 1, since the contraction of the split flame port flow path starts from the region where the rectification of the air-fuel mixture is insufficient at the lower part of the split flame port flow path, the air-fuel mixture flowing in the split flame port flow path starts to contract. The damping effect for speed fluctuation is not sufficiently obtained. Therefore, the combustion noise caused by the speed fluctuation of the air-fuel mixture cannot be reduced as much as the left.

Japanese Unexamined Patent Publication No. 2014-169806

In view of the above points, the present invention sufficiently obtains a damping effect on the speed fluctuation of the air-fuel mixture flowing in the divided flame opening flow path divided by the contact portion of the flame port flow path near the center in the lateral direction of the flame port portion. The challenge is to provide a flat burner that can be used.

In order to solve the above problems, the present invention is a flat burner having an elongated flame opening portion at the upper end portion, in which the longitudinal direction of the flame opening portion is the front-rear direction and the width direction of the flame opening portion is the lateral direction. The burner body, which is composed of a pair of side plates facing each other in the lateral direction, is formed with a lower mixing tube portion and a distribution chamber portion that guides the air-fuel mixture from the mixing tube portion to the flame port portion. A rectifying member having a plurality of rectifying plates arranged side by side in the direction is mounted, and the rectifying member has a flame port flow path defined between the rectifying plates in the front-rear direction by bringing the rectifying plates into contact with each other at a plurality of front and rear positions. In the case where the contact portion is divided into two, each contact portion between the rectifying plates on the inner side in the lateral direction defining the flame opening flow path near the center in the lateral direction of the flame opening portion has an upward width in the front-rear direction. It is characterized by having a gradually increasing widening portion and a narrow constant width portion extending downward from the lower end of the widening portion with the same front-rear width as the front-rear width of the lower end.

According to the present invention, the width in the front-rear direction of the split flame port flow path divided by the contact portion of the flame port flow path near the center in the lateral direction of the flame port portion matches the narrow constant width portion of the contact portion. It is constant at the lower part of the split flame port flow path, and gradually decreases upward at the upper part of the split flame port flow path corresponding to the widening portion of the contact portion. Therefore, the air-fuel mixture is rectified to some extent at the lower part of the split flame port flow path, and then the contraction of the split flame port flow path starts. Therefore, it is possible to effectively attenuate the fluctuation of the flow velocity of the air-fuel mixture and reduce the combustion noise.

Further, in order to promote the rectification of the air-fuel mixture at the lower part of the split flame port flow path, the vertically elongated sub-contact portion abuts the rectifying plates on the inner side in the lateral direction at the middle lower part of the arrangement pitch of the abutting portion. It is desirable to have. However, if the lower end of the widening portion is located below the upper end of the sub contact portion, even if the width in the front-rear direction of the split flame port flow path gradually decreases upward from the height corresponding to the lower end of the widening portion, the sub Beyond the upper end of the contact portion, the width in the front-rear direction of the portion where the air-fuel mixture of the split flame port flow path actually flows is expanded by the width in the front-rear direction of the sub-contact portion. Therefore, the contraction of the split flame port flow path is temporarily interrupted, and the damping effect of the flow velocity fluctuation of the air-fuel mixture is impaired.

Therefore, when the sub-contact portion is provided, it is desirable to position the lower end of the widening portion above the upper end of the sub-contact portion. According to this, the split flame port flow path continuously contracts from the lower end of the widening portion to the upper end of the widening portion without interruption, and the fluctuation of the flow velocity of the air-fuel mixture can be effectively attenuated.

Further, in the present invention, each abutting portion between the straightening vanes on the inner side in the lateral direction has a wide constant width portion extending upward from the upper end of the widening portion with the same front-rear width as the front-rear width of the upper end. May be good. According to this, the air-fuel mixture is rectified so as to be ejected straight upward between the wide constant width portions of the abutting portions adjacent to the front and rear, and the combustion noise caused by the deviation in the ejection direction can be reduced.

The perspective view of the flat burner of embodiment of this invention. The perspective view of the disassembled state of the flat burner of an embodiment. FIG. 6 is a cross-sectional view of a flat burner cut along line III-III of FIG. FIG. 2 is a cut side view of a rectifying member provided in the flat burner of the embodiment cut by the IV-IV line of FIG. FIG. 4 is a cut side view corresponding to FIG. 4 showing another embodiment of the rectifying member. FIG. 4 is a cut side view corresponding to FIG. 4, showing still another embodiment of the rectifying member.

With reference to FIGS. 1 and 2, the flat burner according to the embodiment of the present invention includes a burner main body 1 and a burner cap 2 overlying the burner main body 1. An elongated flame port portion 3 that opens upward is formed on the upper portion of the burner main body 1. Further, the burner cap 2 forms the sleeve flame port portions 4 located on both sides of the flame port portion 3. Then, a light mixture having a fuel concentration lower than the stoichiometric air-fuel ratio is ejected from the flame port 3, and a rich mixture having a fuel concentration higher than the stoichiometric air-fuel ratio is ejected from the sleeve flame port 4, so-called light and light combustion is performed. I am doing it.

Hereinafter, the configuration of the flat burner will be described in detail with the longitudinal direction of the flame opening 3 as the front-rear direction and the width direction of the flame opening 3 as the lateral direction. As shown in FIG. 3, the burner main body 1 is composed of a pair of side plates 11 and 11 facing each other in the lateral direction. The side plates 11 and 11 are formed by bending one plate into a palm-to-hand state along a bending line which is a lower edge of the burner main body 1. Then, by pressing each side plate 11, the burner main body 1 has a flame port portion 3 at the upper end, a mixing tube portion 5 at the lower end, and a distribution chamber portion that guides the air-fuel mixture from the mixing tube portion 5 to the flame port portion 3. 6 and are formed.

The mixing pipe portion 5 extends rearward from the inflow port 51 located at the lower front edge of the burner main body 1, and its rear end portion bends upward to communicate with the distribution chamber portion 6. Further, in the front portion of the burner main body 1, a mixing tube portion 7 for sleeve fire is formed so as to be located between the mixing tube portion 5 and the distribution chamber portion 6. The mixing pipe portion 7 extends slightly rearward from the inflow port 71 located at the lower front edge of the burner main body 1 and is terminated, and a ventilation hole 72 is provided on the side surface of the rear end portion.

A diaphragm portion 61 having a narrowed width is formed in the upper part of the distribution chamber portion 6. The lateral width of the throttle portion 61 gradually widens from the rear portion of the distribution chamber portion 6, which is the inflow point of the air-fuel mixture from the mixing pipe portion 5, toward the front. As a result, the flow rate distribution in the front-rear direction of the air-fuel mixture flowing into the flame port portion 3 is equalized.

The burner cap 2 has a pair of side plates 21 and 21 that are placed on the outside of the pair of side plates 11 and 11 of the burner main body 1, and a plurality of front and rear bridge portions 22 that connect the side plates 21 and 21 at their upper edges. is doing. Then, between the side plate 11 of the burner main body 1 and the side plate 21 of the burner cap 2, the sleeve flame port portion 4 at the upper end and the sleeve fire mixing pipe portion 7 are placed on the outside of the burner main body 1 via the ventilation holes 72. A passage is defined to guide the outflowing air-fuel mixture to the sleeve flame port 4. Further, recesses 23 are formed in a plurality of front and rear positions of the side plate 21 of the burner cap 2 so as to abut on the outer surface of the side plate 11 of the burner main body 1 and divide the sleeve flame port portion 4 in the front-rear direction.

Further, a rectifying member 8 having a plurality of rectifying plates arranged side by side in the lateral direction is mounted in the flame port portion 3. In the present embodiment, the rectifying member 8 is composed of two rectifying plates 8in and 8in on the inner side in the lateral direction and two rectifying plates 8out and 8out on the outer side in the lateral direction. A narrowed portion 31 is formed in the flame port portion 3 of the burner main body 1 so as to be located at an intermediate portion in the vertical direction thereof and to sandwich the rectifying member 8 from both sides in the lateral direction. As a result, a blind gap 32 in which no air-fuel mixture is ejected is defined between the portion of the upper side plate 11 of the narrowed portion 31 and the outer straightening vane 8out.

In the rectifying member 8, the inner and outer rectifying plates 8in and 8out are brought into contact with each other at a plurality of front and rear positions matching the bridge portion 22 of the burner cap 2, and a flame port defined between the two rectifying plates 8in and 8out. A pair of upper and lower contact portions 81, 82 that divide the flow path in the front-rear direction and two inner straightening vanes 8in, 8in are brought into contact with each other, and a flame port portion defined between the inner straightening vanes 8in, 8in. It has a contact portion 83 (see FIG. 4) that divides the flame port flow path near the center in the lateral direction of No. 3 in the front-rear direction. Further, the two inner straightening vanes 8in and 8in are connected by connecting portions 84 at both front and rear ends, and the inner and outer straightening vanes 8in and 8out are connected by connecting portions 85 provided at a plurality of front and rear positions on the lower edge thereof. ..

Here, the air-fuel mixture flows into the flame port flow path near the center in the lateral direction of the flame port portion 3 defined between the inner rectifying plates 8 in and 8 in at a relatively high speed. Therefore, the flow velocity fluctuation of the air-fuel mixture ejected from the flame port flow path tends to be large, and the combustion noise tends to be large due to this flow velocity fluctuation.

Therefore, in the present embodiment, as shown in FIG. 4, the front side edge of each of the contact portions 83 between the inner straightening vanes 8in and 8in is inclined forward toward the upper side and the rear side edge is inclined toward the rearward toward the upper side. A widening portion 83a that is inclined and the width in the front-rear direction gradually increases upward, and a narrow constant width portion 83b that extends downward from the lower end of the widening portion 83a with the same front-rear width as the front-rear width of the lower end. It is formed into something that has. According to this, the width in the front-rear direction of the split flame port flow path divided by the contact portion 83 of the flame port flow path near the center in the lateral direction of the flame port portion 3 is a constant width portion of the width of the contact portion 83. It is constant at the lower part of the split flame port flow path that matches 83b, and gradually decreases upward at the upper part of the split flame port flow path that matches the widening portion 83a of the contact portion 83. Therefore, the air-fuel mixture is rectified to some extent at the lower part of the split flame port flow path, and then the contraction of the split flame port flow path starts. Therefore, it is possible to effectively attenuate the fluctuation of the flow velocity of the air-fuel mixture and reduce the combustion noise.

Next, the embodiment shown in FIG. 5 will be described. This embodiment also has the same contact portion 83 as in the above embodiment in which the inner straightening vanes 8in and 8in are brought into contact with each other, but further, the inner straightening plates 8in and 8in are brought into contact with each other at the arrangement pitch of the contacting portion 83. It has a sub-contact portion 86 that is elongated in the vertical direction to be abutted at the lower middle portion. By providing the sub-contact portion 86 in this way, it is possible to promote the rectification of the air-fuel mixture in the lower part of the split flame port flow path.

In the embodiment shown in FIG. 5, the length of the narrow constant width portion 83b of the contact portion 83 is made shorter than that of the above embodiment, and the inner straightening vanes 8in and 8in are below the constant width portion 83b. A circular small contact portion 87 having a diameter substantially the same as the width in the front-rear direction of the constant width portion 83b is provided so as to bring them into contact with each other. The small contact portion 87 makes it easy to obtain the accuracy of the drawing depth, and is useful for dimensional control of the gap between the inner straightening vanes 8in and 8in. Further, even if the small contact portion 87 is provided, the rectification of the air-fuel mixture in the lower part of the split flame port flow path is not impaired.

By the way, when the sub-contact portion 86 is provided, when the lower end of the widening portion 83a of the contact portion 83 is located below the upper end of the sub-contact portion 86, the width in the front-rear direction of the split flame port flow path is the lower end of the widening portion 83a. Even if the height is gradually reduced upward from the height corresponding to the above, the air-fuel mixture of the split flame port flow path is actually divided by the width in the front-rear direction of the sub-contact portion 86 when the upper end of the sub-contact portion 86 is exceeded. The width of the flowing part in the front-back direction is expanded. Therefore, the contraction of the split flame port flow path is temporarily interrupted, and the damping effect of the flow velocity fluctuation of the air-fuel mixture is impaired.

Therefore, in the embodiment shown in FIG. 5, the lower end of the widening portion 83a of the contact portion 83 is positioned above the upper end of the sub-contact portion 86. According to this, the split flame port flow path continuously contracts from the lower end of the widening portion 83a to the upper end of the widening portion 83a without interruption. Therefore, the fluctuation of the flow velocity of the air-fuel mixture can be effectively attenuated.

Next, the embodiment shown in FIG. 6 will be described. In this embodiment, the abutting portions 83 of the inner straightening vanes 8in and 8in are the same as the widening portion 83a whose front-rear width gradually increases upward and the front-rear width from the lower end of the widening portion 83a to the lower end. It has a narrow constant width portion 83b extending downward in the front-rear direction width and a wide constant width portion 83c extending upward from the upper end of the widening portion 83a in the same front-rear direction width as the upper end. According to this, it is possible to attenuate the fluctuation of the flow velocity of the air-fuel mixture to reduce the combustion noise caused by the fluctuation of the flow velocity as in the embodiment shown in FIG. , 83 is rectified so as to eject straight upward between the wide constant width portions 83c and 83c, and the combustion noise caused by the deviation in the ejection direction can be reduced.

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited thereto. For example, in the above embodiment, the front and rear side edges of the widening portion 83a of the contact portion 83 between the inner straightening vanes 8in and 8in are inclined, but only one front and rear side edge of the widening portion 83a may be inclined. ..

Further, in the above embodiment, only the contact portion 83 between the inner straightening vanes 8in and 8in is formed to have the widening portion 83a and the narrow constant width portion 83b below the widening portion 83a, but the inner and outer sides are formed. The contact portion between the straightening vanes 8in and 8out can also be formed to have a similar widening portion and a constant width portion. Further, although the flat burner of the above embodiment is a light / light combustion type burner provided with the burner cap 2, the present invention can be similarly applied to a flat burner that is not a light / light combustion type in which the burner cap is omitted.

1 ... Burner body, 11 ... Side plate, 3 ... Flame port, 5 ... Mixing tube, 6 ... Distribution chamber, 8 ... Rectifying member, 8in ... Inner rectifying plate (lateral inner rectifying plate), 83 ... Inner rectifying Abutment portion between plates, 83a ... widening portion, 83b ... narrow constant width portion, 83c ... wide constant width portion, 86 ... sub-contact portion.

Claims (3)

It is a flat burner with an elongated flame opening at the upper end, and is composed of a pair of side plates facing each other in the lateral direction with the longitudinal direction of the flame opening in the front-rear direction and the width direction of the flame opening in the lateral direction. A lower mixing tube portion and a distribution chamber portion that guides the air-fuel mixture from the mixing tube portion to the flame port portion are formed in the burner body, and rectification having a plurality of rectifying plates arranged side by side in the flame port portion. The member is mounted, and the rectifying member has a contact portion in which the rectifying plates are brought into contact with each other at a plurality of front and rear positions to divide the flame port flow path defined between the rectifying plates in the front-rear direction.
Each contact portion between the rectifying plates on the inner side in the lateral direction, which defines the flame opening flow path near the center in the lateral direction of the flame opening portion, has a widening portion in which the width in the front-rear direction gradually increases upward and a lower end of the widening portion. A flat burner characterized by having a narrow constant width portion extending downward with the same front-rear width as the front-rear width of the lower end. It has a vertically elongated sub-contact portion that brings the laterally inner straightening vanes into contact with each other at the middle lower portion of the arrangement pitch of the contact portion, and the lower end of the widening portion is above the upper end of the sub-contact portion. The flat burner according to claim 1, wherein the flat burner is located in. Each of the abutting portions of the laterally inner straightening vanes has a wide constant width portion extending upward from the upper end of the widening portion with the same front-rear width as the front-rear width of the upper end. The flat burner according to claim 1 or 2.

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