WO2014207782A1

WO2014207782A1 - Stove burner

Info

Publication number: WO2014207782A1
Application number: PCT/JP2013/004007
Authority: WO
Inventors: 佐藤　裕康
Original assignee: リンナイ株式会社
Priority date: 2013-06-26
Filing date: 2013-06-26
Publication date: 2014-12-31
Also published as: KR102080597B1; CN105283710A; CN105283710B; HK1214645A1; KR20160023677A; SG11201510379YA

Abstract

The purpose of the present invention is, in a stove burner which comprises a burner head (3), a mixing tube (5) connected to the burner head, and a gas nozzle (6) having a nozzle hole (6a) that emits fuel gas toward an inlet (5a) of the mixing tube and which is provided with a cylindrical air damper (7) that restricts the amount of primary air drawn into the mixing tube, to align the central axis of the air damper with the axis of the nozzle hole and thereby emit an air-fuel mixture with a uniform air-fuel ratio from a plurality of burner ports (3a) on the outer circumference of the burner head. The basal end of the air damper (7) is mounted to the gas nozzle (6), and the central axis of the air damper (7) is aligned to the axis of the nozzle hole (6a). In addition, primary air is drawn into the mixing tube (5) via a gap in the axial direction created between the distal end of the air damper (7) positioned further toward the axial distal end than the gas nozzle (6) and the inlet (5a) of the mixing tube (5).

Description

Comrobana

The present invention relates to a burner head including a burner head having a large number of flame outlets on an outer peripheral portion, a mixing tube connected to the burner head, and a gas nozzle having a nozzle hole for ejecting fuel gas toward an inlet portion of the mixing tube.

Conventionally, as this type of burner, one having a cylindrical air damper that limits the amount of primary air sucked from the inlet of the mixing tube is known (for example, see Patent Document 1). In this case, a part of the air damper is inserted into the mixing pipe so that the primary air is sucked into the mixing pipe through an axial gap formed between the end of the air damper protruding from the mixing pipe and the gas nozzle. Yes.

In Patent Document 1, the air damper is fixed by pressing the air damper with a screw screwed in the radial direction from the outer surface of the mixing tube, and the air damper in the axial direction in conjunction with the operation element arranged on the top plate of the stove. There is described a mechanism in which a moving mechanism is provided so that the amount of primary air sucked can be adjusted by operating the operation element. Recently, it has been requested that the amount of primary air sucked cannot be changed by the user's operation on the outer surface of the stove, and the method of moving the air damper via the interlocking mechanism is no longer adopted. Yes.

By the way, in order to inject a uniform air-fuel mixture (mixed gas of fuel gas and primary air) from a large number of flame outlets on the outer periphery of the burner head for good combustion, the central axis of the air damper is the nozzle hole hole. It is necessary to match the axis. However, when the air damper is fixed to the mixing tube with a screw as in the above-described conventional example, the air damper may be tilted depending on how the screw is tightened, and its central axis may be tilted with respect to the hole axis of the nozzle hole. Even in the case of using the interlocking mechanism, the air damper is inclined by the sliding clearance relative to the mixing tube, and it is difficult to make the center axis of the air damper coincide with the hole axis of the nozzle hole.

Japanese Utility Model Publication No. 60-5229

In view of the above, the present invention makes it possible to jet a uniform air-fuel ratio mixture from a large number of flame openings on the outer peripheral portion of the burner head by aligning the center axis of the air damper with the hole axis of the nozzle hole. The challenge is to provide a cooked stove.

In order to solve the above problems, the present invention has a burner head having a large number of flame outlets on the outer peripheral portion, a mixing tube connected to the burner head, and a nozzle hole for ejecting fuel gas toward the inlet portion of the mixing tube. In a stove burner equipped with a gas nozzle and having a cylindrical air damper that limits the amount of primary air sucked into the mixing tube, the air damper is designed so that its central axis coincides with the hole axis of the nozzle hole. Attached to the gas nozzle at the end, the primary air is sucked into the mixing tube through an axial gap formed between the tip of the air damper positioned axially ahead of the gas nozzle and the inlet of the mixing tube. And

According to the present invention, by attaching the base end portion of the air damper to the gas nozzle, it is possible to ensure the positional correlation of the air damper with respect to the gas nozzle and accurately match the center axis of the air damper with the hole axis of the nozzle hole. Therefore, the primary air sucked through the axial gap between the tip of the air damper and the inlet of the mixing tube is evenly distributed around the entire circumference of the gas flow ejected from the nozzle hole. As a result, an air-fuel mixture having a uniform air-fuel ratio can be ejected from a large number of flame openings on the outer peripheral portion of the burner head, and the combustion state is improved.

In addition, as a method of attaching the base end portion of the air damper to the gas nozzle, a method of screwing the base end portion of the air damper to the outer periphery of the gas nozzle and a bent edge portion bent inward in the radial direction are formed at the base end of the air damper. , Between the nozzle holding member for screwing the gas nozzle and the flange portion formed on the outer periphery of the gas nozzle, or between the flange portion formed on the outer periphery of the gas nozzle and the pressing member screwed on the outer periphery of the gas nozzle from the front in the axial direction. And a method of sandwiching a bent edge portion. In particular, in the method in which the base end portion of the air damper is screwed to the outer peripheral surface of the gas nozzle, the air damper is advanced and retracted in the axial direction by its rotation, and the axial gap amount between the tip of the air damper and the inlet portion of the mixing tube It is advantageous that the amount of primary air sucked can be adjusted by varying.

The perspective view of the stove burner of 1st Embodiment of this invention. Sectional drawing cut | disconnected by the II-II line | wire of FIG. Sectional drawing of the stove burner of 2nd Embodiment. The perspective view of the air damper provided in the stove burner of 2nd Embodiment. Sectional drawing of the stove burner of 3rd Embodiment.

Referring to FIGS. 1 and 2, reference numeral 1 denotes a burner holder installed in a stove main body (not shown), and the stove burner 2 is supported by the burner holder 1. The burner holder 1 protrudes so as to face the pedestal portion 11 from the upper end of the column portion 12, a pedestal portion 11 that is a nozzle holding member to which a gas nozzle 6 to be described later is attached, a column portion 12 erected on one end of the pedestal portion 11. And an upper plate portion 13.

The stove burner 2 has a circular burner head 3 having a large number of flame ports 3 a on the outer peripheral portion, a disc-like burner cap 4 placed on the burner head 3, and a central portion on the lower surface of the burner head 3. A mixing pipe 5 provided vertically and a gas nozzle 6 having a nozzle hole 6 a through which fuel gas is ejected toward an inlet portion 5 a at the lower end of the mixing pipe 5 are provided. The gas nozzle 6 is screwed onto the upper surface of the pedestal portion 11 of the burner holder 1, and fuel gas is supplied to the gas nozzle 6 through a gas passage 11 a formed in the pedestal portion 11.

Further, a support cylinder portion 13a concentric with the gas nozzle 6 (hole axis of the nozzle hole 6a) is formed on the upper plate portion 13 of the burner holder 1. Then, by inserting the mixing tube 5 into the support cylinder portion 13a, the burner head 3 is supported by the burner holder 1 so that the gas nozzle 6 and the mixing tube 5 are positioned on the same axis. . In addition, the mixing pipe 5 does not have a venturi portion whose diameter is reduced with respect to the inlet 5a, and sucks primary air from the inlet 5a by a radial venturi effect described later.

The burner head 3 has an annular raised portion 3b that protrudes upward from the opening edge of the upper end of the mixing tube 5, and an annular wall 3c that protrudes upward from the outer peripheral portion of the upper surface. In the annular wall 3c, a number of groove-shaped flame openings 3a that are recessed downward from the upper end surface are formed at intervals in the circumferential direction.

On the lower surface of the burner cap 4, a back plate 4a facing the upper end surface of the raised portion 3b with a predetermined gap is attached. A plurality of centering pieces 4b are vertically provided on the outer periphery of the back plate 4a with a circumferential interval therebetween, and the lower ends of these centering pieces 4b abut on the outer peripheral surface of the raised portion 3b to burn the burner. The cap 4 is centered with respect to the burner head 3.

When the fuel gas is ejected from the gas nozzle 6, the gas flow flowing into the burner head 3 through the mixing tube 5 strikes the lower surface of the back plate 4 a and expands in the radial direction, producing a so-called radial venturi effect, and the inlet portion of the mixing tube 5. Primary air is inhaled from 5a. Then, the air-fuel mixture of the fuel gas and the primary air is ejected from the flame port 3 a on the outer peripheral portion of the burner head 3, and the air-fuel mixture burns by the supply of secondary air from the outside of the burner head 3.

Moreover, the stove burner 2 is provided with a cylindrical air damper 7 that limits the amount of primary air sucked into the mixing tube 5 to an appropriate amount according to the gas type. In the present embodiment, the base end (lower end) of the air damper 7 is attached to the gas nozzle 6. The primary air is sucked into the mixing tube 5 through an axial gap formed between the tip (upper end) of the air damper 7 positioned axially ahead of the gas nozzle 6 and the inlet portion 5 a of the mixing tube 5. I have to. Hereinafter, this point will be described in detail.

The gas nozzle 6 has a cylindrical portion 6d having a smaller diameter than the flange portion 6c between the tapered portion 6b at the tip where the nozzle hole 6a is formed and the intermediate flange portion 6c seated on the pedestal portion 11. A male screw is formed on the outer peripheral surface of the cylindrical portion 6d. A female screw corresponding to the male screw is formed on the inner peripheral surface of the air damper 7, and the base end portion of the air damper 7 is screwed to the outer periphery of the cylindrical portion 6d.

If the base end portion of the air damper 7 is attached to the gas nozzle 6 as described above, the positional correlation of the air damper 7 with respect to the gas nozzle 6 can be ensured, and the center axis of the air damper 7 can be made to exactly coincide with the hole axis of the nozzle hole 6a. . Therefore, the primary air sucked through the axial gap between the tip of the air damper 7 and the inlet portion 5a of the mixing tube 5 is evenly distributed around the entire circumference of the gas flow ejected from the nozzle hole 6a. . As a result, the air-fuel mixture having a uniform air-fuel ratio can be ejected from the numerous flame ports 3a on the outer peripheral portion of the burner head 3, and the combustion state is improved.

In this embodiment, since the air damper 7 is screwed into the gas nozzle 6, the air damper 7 can be moved back and forth in the axial direction by its rotation. Therefore, the amount of gap in the axial direction between the tip of the air damper 7 and the inlet portion 5a of the mixing tube 5 can be varied to adjust the suction amount of the primary air.

Next, the second embodiment shown in FIGS. 3 and 4 will be described. The basic structure of the stove burner 2 of the second embodiment is not particularly different from that of the first embodiment, and the same members and parts as those of the first embodiment are denoted by the same reference numerals.

The differences between the second embodiment and the first embodiment are the way in which the air damper 7 is attached to the gas nozzle 6 and the structure of the air damper 7. This difference will be described in detail below. In the second embodiment, an annular bent edge portion 7a that is bent inward in the radial direction is formed at the base end (lower end) of the air damper 7. Then, the bent edge portion 7 a is sandwiched between the base portion 11 and the flange portion 6 c of the gas nozzle 6, and the base end portion of the air damper 7 is attached to the gas nozzle 6. In FIG. 3, a step portion 6 c ′ that floats from the pedestal portion 11 by the thickness of the bending edge portion 7 a is formed on the outer peripheral portion of the lower surface of the flange portion 6 c, and the step portion 6 c ′ and the pedestal portion 11 are formed. The bending edge 7a is sandwiched between the two. Further, the gas nozzle 6 is not provided with the cylindrical portion 6d of the first embodiment.

Also in the second embodiment, since the base end portion of the air damper 7 is attached to the gas nozzle 6, as in the first embodiment, the center axis of the air damper 7 is made to coincide with the hole axis of the nozzle hole 6a, and the burner head 3 A uniform air-fuel ratio air-fuel mixture can be ejected from a large number of nozzles 3a on the outer periphery.

In the second embodiment, the air damper 7 includes a first cylindrical member 71 on the base end side (lower side) where the bent edge portion 7 a is formed, and a distal end side (upper side) extrapolated to the first cylindrical member 71. The second cylindrical member 72 is used. At two locations in the circumferential direction at the upper end of the first tubular member 71, tongue piece portions 71a that protrude radially outward are bent. Further, at two places in the circumferential direction of the second cylindrical member 72, a vertical hole 72a into which the tongue piece portion 71a can be inserted from below, and two upper and lower steps extending from one side edge of the vertical hole 72a in the circumferential direction. Side holes 72b and 72c are formed. The length of the air damper 7 can be switched to three stages by selectively engaging the tongue piece 71a with the upper end of the vertical hole 72a, the upper horizontal hole 72b, and the lower horizontal hole 72c. ing. Thereby, the gap | interval amount between the front-end | tip (the upper end of the 2nd cylindrical member 72) of the air damper 7 and the inlet part 5a of the mixing pipe 5 can be varied, and the suction | attraction amount of the primary air to the mixing pipe 5 can be adjusted.

In addition, the 2nd cylindrical member 72 is formed in the comparatively large diameter close | similar to the diameter of the lower end part of the mixing pipe 5, and when a large amount of boiled spill occurs, boiled simmered juice is from the 2nd cylindrical member 72. There is a possibility of entering the air damper 7. Therefore, a hole 71b is formed in the lower part of the peripheral surface of the first cylindrical member 71 so that the simmered juice that has entered the air damper 7 can be discharged through the hole 71b.

Next, a third embodiment shown in FIG. 5 will be described. The basic structure of the stove burner 2 of the third embodiment is not particularly different from that of the first embodiment, and the same members and parts as those of the first embodiment are denoted by the same reference numerals.

The difference of the third embodiment from the first embodiment is how the air damper 7 is attached to the gas nozzle 6. This difference will be described in detail below. In the third embodiment, at the base end (lower end) of the air damper 7, a bent edge portion 7 a that can be seated on the upper surface of the flange portion 6 c of the gas nozzle 6 and is bent inward in the radial direction is formed. Moreover, the nut 61 which is a pressing member screwed from the axial direction ahead (above) to the external thread of the outer peripheral surface of the cylindrical part 6d of the gas nozzle 6 is provided. The bent edge portion 7 a is sandwiched between the flange portion 6 c and the nut 61, and the base end portion of the air damper 7 is attached to the gas nozzle 6.

Thus, also in the third embodiment, since the base end portion of the air damper 7 is attached to the gas nozzle 6, as in the first embodiment, the central axis of the air damper 7 is made to coincide with the hole axis of the nozzle hole 6a, A uniform air-fuel ratio mixture can be ejected from a large number of flame ports 3a on the outer peripheral portion of the burner head 3.

In the third embodiment, a plurality of types of air dampers 7 having different lengths are prepared, an air damper 7 having an appropriate length corresponding to the gas type is selected, attached to the gas nozzle 6, and sucked into the mixing tube 5. The amount of air is limited to an appropriate amount according to the gas type.

As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, in the second embodiment, the air damper 7 is not composed of two members, but a plurality of types of air dampers 7 having different lengths are prepared as in the third embodiment, and an air damper having an appropriate length according to the gas type is prepared. 7 may be selected and attached to the gas nozzle 6. Alternatively, in the third embodiment, the air damper 7 is composed of the same two members as in the second embodiment, and the length of the air damper 7 depends on the gas type. It may be variable. In the third embodiment, the nut 61 is used as a presser member that is screwed into the outer periphery of the gas nozzle 6 from the axial direction. However, it is also possible to configure the presser member with a spring washer or the like in which a female screw is formed on the inner periphery. It is. In the above embodiment, the present invention is applied to the stove burner 2 that sucks primary air from the inlet portion 21a of the mixing tube 21 by the radial venturi effect without forming the venturi portion in the mixing tube 21. The present invention can be similarly applied to a stove burner including a mixing tube having a venturi section.

DESCRIPTION OF SYMBOLS 1 ... Burner holder, 11 ... Base part (nozzle holding member), 2 ... Combustor, 3 ... Burner head, 3a ... Flame port, 5 ... Mixing pipe, 5a ... Inlet part, 6 ... Gas nozzle, 6a ... Nozzle hole, 6c ... Flange portion, 61... Nut (pressing member), 7... Air damper, 7 a.

Claims

A burner head comprising a burner head having a number of flame outlets on the outer periphery, a mixing tube connected to the burner head, and a gas nozzle having a nozzle hole for ejecting fuel gas toward the inlet of the mixing tube, the mixing tube With a cylindrical air damper that limits the amount of primary air sucked into the
The air damper is attached to the gas nozzle at the base end so that its center axis coincides with the hole axis of the nozzle hole, and is generated between the tip of the air damper positioned axially ahead of the gas nozzle and the inlet of the mixing tube. A stove burner characterized in that primary air is sucked into the mixing tube through an axial gap.
The stove burner according to claim 1, wherein a base end portion of the air damper is screwed onto an outer periphery of the gas nozzle.
A bent edge that is bent radially inward is formed at the base end of the air damper, and the bent edge is sandwiched between a nozzle holding member that screws the gas nozzle and a flange formed on the outer periphery of the gas nozzle. The stove burner according to claim 1, characterized in that:
A bent edge that is bent radially inward is formed at the base end of the air damper, and a bent edge is formed between a flange formed on the outer periphery of the gas nozzle and a presser member that is screwed into the outer periphery of the gas nozzle from the front in the axial direction. 2. The stove burner according to claim 1, wherein the portion is sandwiched.