JP2695593B2 - Gas nozzle mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for a gas nozzle mounted on a suction port of a burner.

[0002]

2. Description of the Related Art A burner body having a crater at one end, a mixing tube at the middle, and an inlet for fuel gas and primary air at the other end, and a rear end connected to a gas pipe coaxially facing the inlet. A burner having a gas nozzle for ejecting a fuel gas into the mixing pipe and having a primary air port provided between the gas nozzle and the mixing pipe is manufactured. In the burner of this structure, conventionally, the gas nozzle is screwed to the tip of the gas pipe and is inserted from the suction port, and the primary air is sucked by the ejector effect, which has the following drawbacks. A) The burner body and the gas nozzle are separately fixed to the gas equipment. Therefore, it takes time to assemble the burner to the gas equipment and adjust the position. (B) When assembled or after long-term use, one or both mounting positions are displaced, resulting in an angular displacement, and a defective plunge into the mixing tube. As a result, the primary air is not properly sucked, the primary air becomes insufficient, and combustion failure easily occurs.

In order to solve such a problem, Japanese Patent Laid-Open No. 1-
In Japanese Patent No. 266413, a flange portion is provided at the tip of the gas pipe, and an O-ring is externally fitted to the end of the flange portion.
Insert the tip part into the rear part of the gas nozzle, engage the flange part at one end of the fixing metal fitting, and simultaneously fit the gas nozzle and the tip part of the gas pipe into the mixing pipe, and screw the other end of the fixing metal fitting to the burner body. A configuration to do so has been proposed.

[0004]

However, this gas nozzle mounting structure has the following drawbacks. a) The work of fixing the fixing bracket with screws is troublesome, automation of assembly is difficult, and productivity is poor. b) In order to prevent the displacement of the gas nozzle, the outer circumference of the gas nozzle and the inner circumference of the mixing tube have the same diameter, and the axes are aligned. Therefore, it is necessary to form a large number of holes for the primary air ports in a row on the outer periphery of the mixing tube, which requires a lot of time and labor for drilling. An object of the present invention is to provide a gas nozzle and a mixing pipe (suction port) in a burner in which one end of the mixing pipe serves as a suction port, a gas nozzle is coaxially attached to the suction port, and a primary air port is provided on the outer circumference of the gas nozzle. It is to provide a mounting structure for a gas nozzle, which can easily and surely match the axes of the gas nozzle, and which is easy to assemble the burner and has high productivity.

[0005]

According to a first aspect of the present invention, there is provided a gas nozzle mounting structure, which is attached to a burner mixing pipe having a suction port for fuel gas and primary air at one end thereof, and the suction port. A primary air opening mechanism that closes one end surface of the mixing tube and forms a fitting hole into which a tip end of a gas nozzle is fitted, and forms a primary air opening around the fitting hole; and the primary air opening mechanism on the outer periphery. It has a flange portion that in the outer surface in contact, the tip with is fitted into the fitting hole, and wherein the gas nozzle tip of the gas pipe is connected to the rear end, which is connected to the rear end of the gas nozzle there the mounting structure of the definitive gas nozzle to the burner and a gas pipe
Te, an engagement portion of the engagement portion and the mixing tube to the gas pipe or the gas nozzle, by a spring means for pressing the gas tube or the gas <br/> Sunozuru to the mixing tube, the nozzle And attaching the gas pipe to the mixing pipe
In the mounting structure of the gas nozzle, the spring means is
Lock at the rear end of the gas nozzle or the front end of the gas pipe.
Nozzle fitting with one end engaging the mixing tube and the other end
Characterized Rukoto such from the injector push spring engages the serial nozzle fitting. In claim 2, fuel gas and
And a mixing tube of a burner provided with an inlet for primary air
Attached to the suction port,
Fitting hole into which the tip of the gas nozzle is fitted while closing
Forming a primary air port around the fitting hole
Air outlet mechanism and outer periphery abut on the outer surface of the primary air inlet mechanism
Has a brim-like portion, and the tip end is fitted into the fitting hole.
Along with the gas connected to the front end of the gas pipe at the rear end
Nozzle and the gas pipe connected to the rear end of the gas nozzle
With the mounting structure of the gas nozzle in the burner provided with
And the engaging portion to the gas pipe or the gas nozzle.
And an engaging portion for the mixing pipe, the gas pipe or front
By the spring means for pressing the gas nozzle against the mixing tube,
Attaching the gas nozzle and the gas pipe to the mixing pipe
In the mounting structure of the gas nozzle,
The tip of the gas pipe is connected near the tip of the gas pipe.
A flange is provided on the tip side of the flange
The O-ring is fitted on the outside of the gas pipe and the tip of the gas pipe is
It is characterized by being inserted in the rear part of the nozzle.
According to claim 3, in claim 1, the mixing pipe is provided on both sides.
It has a projecting piece that projects, and the nozzle attachment is
The arm that holds the installation piece from above and below and the rear end of the gas nozzle.
Or a shoulder that engages the tip of the gas pipe.
It is characterized by. In claim 4, in claim 1, the
The nozzle pressing spring is formed by bending a wire into a U-shape.
And the tips of both arm rods are projected on both sides of the mixing pipe.
Engages in a hole or notch formed in the piece to provide an intermediate connection
The part is locked to the rear end of the nozzle fitting.
And

[0006]

According to the present invention, since the gas nozzle and the gas pipe are fixed to the mixing pipe by the elastic force of the spring mechanism, the following effects can be obtained. 1) Since the nozzle can be assembled without using a screw fixing tool, automation is easy and productivity is excellent. 2) Since the gas nozzle and the gas pipe are elastically fixed to the mixing pipe at the same time under the force of pressing, deformation of parts and loosening of fastening parts may occur during assembly or when external force is applied during use. Even when it is opened, the misalignment between the mixing tube and the gas nozzle can be prevented.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1, 2, 3 and 4 show a burner 100 according to an embodiment of the present invention, which has a burner body 1 made of sheet metal. The burner body 1 is formed by bending and stacking symmetrically bulged sheet metals at symmetrical planes to form a mixing tube 10 at the bulging portion, and non-bulging portions (flat plate portions) projecting from both sides of the mixing tube 10. The pieces 1A and 1B are formed. The mixing tube 10 has an inlet 11 for fuel gas and primary air having a large diameter at its tip, a throat 12 having a small diameter, and a diffusion 13 for gradually increasing the flow passage area, and a crater provided at the other end (Fig. (Not shown). The suction port 11 is provided with the projecting pieces 1A and 1B on the outer periphery thereof and has a cylindrical shape, and a pair of engaging holes 14 and 14 are formed in the projecting pieces 1A and 1B close to the suction port 11.

The inlet 11 is provided with a primary air inlet mechanism 2. At the center of the primary air inlet mechanism 2, a gas nozzle 4 is installed coaxially with the inlet 11 of the burner body 1 and ejects fuel gas to the burner body 1. A gas pipe 5 is connected to the rear end of the gas nozzle 4. A primary air opening 20 is formed by the primary air opening mechanism 2 between the outer circumference of the gas nozzle 4 and the inner circumference of the burner body 1.
The gas nozzle 4 and the gas pipe 5 are attached to the burner body 1 by spring means 6.

The primary air inlet mechanism 2 includes a cap 23 having a tubular portion 21 fitted to the outer periphery of the inlet 11 and a side plate 22 for closing the end face of the inlet 11 (mixing tube 10), and the cap. And a disk-shaped lid plate 3 mounted so as to be rotatably slidably contacted with the outer surface of 23. A center hole 2 which is a fitting hole into which the gas nozzle 4 is fitted is formed in the center of the side plate portion 22.
4 are formed, and fan-shaped primary air holes 25, 25 are formed above and below the center hole 24. The cover plate 3 has a disc shape,
A center hole 32 with a shaft cylinder 31 whose tip is widened and fan-shaped air holes 33, 33 corresponding to the primary air holes 25, 25 are formed, and four protrusions 34 are provided on the outer periphery at equal intervals. . The shaft cylinder 31 is inserted into the center hole 24 of the cap 23, the cover plate 3 is rotatably supported with respect to the cap 23, and the opening degree is adjusted by both the primary air holes 25, 25 and the air holes 33, 33. Possible primary air openings 20 are formed.

The gas nozzle 4 has a cylindrical shape, and the mixing tube 10
A collar-shaped portion 43 is formed in the middle of the front end portion 41 and the rear side portion 42 that are engaged with each other, and the rear end portion 44 that is an engaged portion with the gas pipe has a large diameter. The tip of the shaft has a small diameter portion 4A,
Subsequently, a nozzle hole 40 having a tapered portion 4B, an intermediate diameter portion 4C in the middle and a large diameter portion 4D at the rear end is provided so as to penetrate therethrough. In the gas nozzle 4, the tip portion 41 is inserted into the center hole 24 (center hole 32), and the flange portion 43 is in contact with the outer surface of the lid plate 3.

The gas pipe 5 is provided with a flange portion 52 at the tip end portion 51 by bulging, and an O-ring 53 is externally fitted to the tip of the flange portion 52. Gas pipe 5 tip 5
1 is a medium-diameter portion in which the flange portion 52 and the O-ring 53 are inserted into the large-diameter portion 4D located at the rear end of the nozzle hole 40 in a sealed state, and the O-ring 53 is located in the middle of the nozzle hole 40. It is inserted coaxially in 4C.

The spring means 6 comprises a nozzle fitting 60 and a nozzle pressing spring 7 in this embodiment. The nozzle fixture 60 connects the arm portions 61, 61 with which the tips are locked by sandwiching the projecting pieces 1A, 1B of the burner body 1 from above and below, and connecting the arm portions 61, 61 with each other. Tube 5
And a back portion 62 that is locked to the rear end surface 44a of the gas nozzle. The nozzle pressing spring 7 has a pair of engaging holes 14 provided at the tips on the projecting pieces 1A and 1B,
Arm bar portions 71, 71 to be locked to 14 and these arm bar portions 7
1, 71 are connected to each other, and the rear end of the nozzle attachment 60 is locked to the back portion 62 of the nozzle attachment 60 or its vicinity, and includes a horizontal rod portion 72 which is an intermediate connecting portion. This nozzle pressing spring 7
Presses and fixes the gas nozzle 4 and the gas pipe 5 to the burner body 1 by elastic force via the nozzle attachment 60.

In this embodiment, the nozzle fitting 60 is made by bending a sheet metal punched into a predetermined shape into a U-shape, and the arm portions 61, 61 have corrugated slits 63, 63 from the tips thereof.
Are formed in the horizontal direction, and arc portions 64, 64 are provided below the bases of the arm portions 61, 61, and there are rear end portions.
Inverted L-shaped notches 65 and 6 that connect to 4 in a smooth curve
5 are formed. A notch 66 including a central circle is formed in the back portion 62 so as to be fitted onto the gas pipe 5 so as to be obliquely inclined from above.

The corrugated slits 63, 63 are in contact with the upper and lower surfaces of the projecting pieces 1A, 1B at the apexes P of the corrugations provided in the upper and lower sides (upper and lower locations in this embodiment). The nozzles 1A and 1B are tightly gripped to restrain the displacement of the nozzle fixture 60 other than the front-rear direction (slit direction). By forming the slits 63, 63 in a corrugated shape as in this embodiment, it is possible to easily mount and engage with a strong holding force. This nozzle fitting 60 has a notch 6
6 is fitted into the gas pipe 5 behind the flange portion 52, and the slits 63, 63 are attached by advancing and pushing the inlets of the slits 63, 63 in line with the ends of the projecting pieces 1A, 1B.

The nozzle pressing spring 7 is formed by bending a wire rod so that its plane has a substantially U shape. In the arm rod portions 71, 71, the front end portions 73, 73 are bent upward in a key shape, and the rear end portions 74, 74 are bent upward by about 105 degrees. The nozzle pressing spring 7 has the tip portions 73, 73.
Is inserted into the engagement holes 14, 14 of the projecting pieces 1A, 1B, and the horizontal bar portion 72 is slid over the circular arc portions 64, 64 while being engaged with the notches 65, 65 to be mounted.

FIG. 5 shows another embodiment of the spring means 6. In this embodiment, the nozzle mount 60 has rectangular holes 67, 67 at both ends of the back 62. In the arm rod portions 75, 75 of the nozzle pressing spring 7, the tip portions 76, 76 are bent downward in a hook shape, and wedge-shaped bent portions 77, 77 are formed in the rear portions so that the tip portions fit in the rectangular holes 67, 67. Has been done.

In the present invention, the engaging holes 14, 14 of the projecting pieces 1A, 1B may be notches. Also, the spring means 6
As an alternative, the nozzle fixture 60 may not be provided and only the nozzle pressing spring 7 may be used. In this case, the horizontal rod portion 72 is used to lock the gas pipe 5 and the gas nozzle 4. Further, the nozzle pressing spring 7 may be formed of a plate member instead of the wire material.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a gas nozzle mounting structure of a burner.

FIG. 2 is a plan perspective view of a gas nozzle mounting structure of a burner.

FIG. 3 is a perspective view of a gas nozzle mounting structure.

FIG. 4 is a perspective view of a nozzle fitting.

FIG. 5 is a perspective view of a gas nozzle mounting structure according to another embodiment.

[Explanation of symbols]

 100 burner 1 burner main body 2 primary air port mechanism 3 lid plate 4 gas nozzle 5 gas pipe 6 spring means 7 nozzle pressing spring 10 mixing pipe 20 primary air port 24 center hole (fitting hole) 41 tip part (engagement part) 43 collar Shaped part 44 Rear end part (engagement part) 51 Tip part 60 Nozzle attachment

Claims (4)

(57) [Claims] 1. A mixing pipe of a burner having a suction port for fuel gas and primary air at one end, and a fitting attached to the suction port for closing one end surface of the mixing pipe and fitting a tip portion of a gas nozzle into the fitting pipe. A primary air port mechanism that forms a dowel hole and forms a primary air port around the fitting hole, and a collar-shaped portion that contacts the outer surface of the primary air port mechanism on the outer periphery, and the tip portion is the mating hole. together they are fitted into the holes, with said gas nozzle tip of the gas pipe is connected to the rear end, and said gas tube is connected to the rear end of the gas nozzle
A mounting structure of a gas nozzle definitive in the burner, an engagement portion of the engagement portion and the mixing tube to the gas pipe or the gas nozzle, said mixing said gas tube or the Gasuno <br/> Zur A gas that attaches the gas nozzle and the gas pipe to the mixing pipe by spring means that presses against the pipe.
In the nozzle mounting structure, the spring means is the rear end of the gas nozzle or the gas nozzle.
Nozzle fitting that locks to the tip of the
Nozzle that engages a joint pipe and the other end engages the nozzle fixture
A mounting structure for a gas nozzle, which is characterized by comprising a pressing spring . 2. An inlet for fuel gas and primary air at one end
Attached to the suction port and the mixing tube of the burner provided with, and closes one end surface of the mixing tube
Together with it, form a fitting hole into which the tip of the gas nozzle is fitted.
Primary air that forms a primary air port around the fitting hole
The mouth mechanism and the collar-shaped part that contacts the outer surface of the primary air mouth mechanism on the outer periphery.
The front end is fitted into the fitting hole and the rear end
And a gas pipe connected to the rear end of the gas nozzle.
A structure for mounting a gas nozzle in the burner, comprising: an engaging portion for the gas pipe or the gas nozzle;
The engagement portion of the mixing tube possess, the gas tube or the Gasuno
By the spring means for pressing the chewing pipe against the mixing pipe, the gas
Gas for attaching the nozzle and the gas pipe to the mixing pipe
In the nozzle mounting structure, the gas nozzle and the tip of the gas pipe are connected by the gas
Provide a flange near the tip of the pipe and
Of the gas pipe by fitting an O-ring on the tip side from the injection part.
Insert the tip into the rear of the gas nozzle.
And a gas nozzle mounting structure. 3. The method of claim 1, wherein the mixing tube includes a projecting piece projecting on either side, and the arm portion and the nozzle fitting sandwiching the both projecting pieces from above and below, the rear end of the gas nozzle Or a shoulder portion that engages with the tip portion of the gas pipe. 4. The nozzle pressing spring according to claim 1 , wherein the wire is bent into a substantially U-shape, and the tips of both arm rods are formed in projecting pieces projecting on both sides of the mixing tube. Alternatively, the mounting structure for the gas nozzle is characterized in that the notch is engaged with the intermediate connecting part and the intermediate connecting part is engaged with the rear end part of the nozzle mounting tool.