JPH0324991Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a gas burner comprising a mixing tube for mixing fuel gas and primary air and a burner top mounted on the mixing tube.

[Prior art]

In a gas burner consisting of a mixing pipe for mixing fuel gas and primary air and a burner top placed on top of the mixing pipe, the mixing pipe is made of a press-molded product, but as shown in Fig. 12, the bottom The annular plate 19 was connected to the plate 7 at the central hole edge a, and the upper plate 8 on which the upper annular curved portion 39 was formed was connected to the annular plate 19 at its upper end edge b.

[Problem that the invention attempts to solve]

By the way, in the case where the annular plate 19 is connected to the lower plate 7 at the central hole edge a and the upper plate 8 on which the upper annular curved portion 39 is formed is connected at the upper edge b of the annular plate 19 as described above, Since the annular plate 19 is interposed between the plates 8 and 7, distortion occurs when the annular plate 19 is connected, resulting in misalignment at the connection point between the upper plate 8 and the annular plate 19. 8 and the annular plate 19 becomes difficult, and the center hole of the mixing tube 1 deforms from a perfect circle after connection, making it difficult to fit with the burner top 2, which is made of cast iron or the like and has high manufacturing precision. , there were problems such as lowering the product value. Then, the upper and lower plates were connected by welding or caulking at the center hole and the outer circumference to produce a sheet metal mixing pipe.
Although a mixing tube made of sheet metal has also been proposed in Japanese Patent No. 15242, it is difficult to attach devices such as an ignition device, and there is a problem in that it is difficult to obtain sufficient mounting strength.

[Means for solving problems]

In the gas burner of the present invention, although the mixing tube 1 is a press-molded product, the lower surface of the burner top 2 and its fitting protrusion 25 can be inserted and mounted, and the supply hole 5 for the burner top 2 is formed. An upper annular curved portion 39 is formed on the upper plate 8, and the upper annular curved portion 3
The above-mentioned problem can be solved by forming a lower annular curved portion 29 on the lower plate 7 opposite to the annular hollow portion 18 and connecting the upper and lower plates 8 and 7 at the edges of the respective central holes. .

[Effect]

That is, in the present invention, although the mixing tube 1 is a press-molded product, the lower surface of the burner top 2 and its fitting protrusion 25 can be inserted and mounted, and the supply hole 5 for the burner top 2 is formed. An upper annular curved portion 39 is formed on the upper plate 8, and a lower annular curved portion 29 that can form the annular hollow portion 18 is formed on the lower plate 7, facing the upper annular curved portion 39. By connecting the plates 8, 7 at the edges of their central holes, the conventional annular plate 19 interposed between the upper and lower plates 8, 7 can be omitted, and the upper and lower plates 8, 7 press-molded.
The connection is made only at the top of the burner top 2, which almost eliminates positional deviation at the connection point, makes the connection work easier, prevents deformation of the center hole of the press-molded mixing pipe 1, improves the fit to the burner top 2, and improves the product. In order to increase the value, and in a part of the circumferential direction of the annular cavity 18, the curved lower plate 7 portion is overlapped with the inner surface of the upper plate 1 to form a double portion, and the through hole 12 is formed in this double portion. is formed, and the ignition device 13 is attached and held in the double portion with the ignition device 13 located in the through hole 12, thereby making the holding of the ignition device 13 strong, making it easy to achieve and maintain its positional accuracy. This enabled the ignition device to perform the ignition operation as specified.

〔Example〕

The mixing tube 1 is a press-molded product made by caulking a drawn lower plate 7 and an upper plate 8, and has an annular portion 9 formed at its tip, on which is mounted a burner top 2 made of, for example, brass casting. It is designed so that you can do it. Supply holes 5 are formed on the upper surface of the annular portion 9 at intervals in the circumferential direction so that fuel gas mixed with primary air can be supplied to the burner top 2 side.

The mixing tube 1 is made into a press-molded product as follows. That is, the lower surface of the burner top 2 and its fitting protrusion 25 can be inserted and mounted;
and an upper annular curved portion 39 in which a supply hole 5 for the burner top 2 is formed; an upper tunnel curved portion 26 that is continuous with the upper annular curved portion 39 and is curved upward; and an upper annular curved portion 39 and the upper flange 2 formed around the upper tunnel bending part 26
7 are formed in series on the upper plate 8. A lower tunnel bending part 28 facing the upper tunnel bending part 26, a lower annular bending part 29 facing the upper annular bending part 39, and these lower tunnel bending part 28 and lower annular bending part 29.
A lower flange 30 formed around the periphery of the lower flange 30 is formed in series on the lower plate 7. And upper and lower flanges 27, 30
The upper and lower plates 8 and 7 are connected by a gap at the center hole edges of the upper and lower plates 8 and 7, and then they are clamped together using a press.

The burner top 2 is formed by forming an annular upper surface portion 3 upwardly sloping outward from the upper end of a cylindrical portion 10 serving as a central fitting protrusion 25, and penetrating this upper surface portion 3 to form an inner surface. A flame hole 4 is formed, and a protrusion 1 is formed at a small interval on the periphery of the back surface of the upper surface portion 3.
1 is provided around the circumference, and an outer flame hole 6 is provided between these protrusions 11, 11.
....

A through hole 12 is formed in the mixing tube 1 and opens only upward and downward.
is inserted from below, and the igniter 13 is attached to the mixing pipe 1 via a fitting. That is, as shown in FIG. 2, in a part of the circumferential direction of the annular cavity 18, the curved lower plate 7 portion is overlapped with the inner surface of the upper plate 1 to form a double portion. A through hole 12 is formed in the portion, and the ignition device 13 is attached to and held in the double portion with the ignition device 13 located in the through hole 12, thereby making it possible to hold the ignition device 13 firmly and making it easy to achieve its positional accuracy. and can be maintained, and the ignition operation by the ignition device 13 can be performed as prescribed. This igniter 13 uses a piezoelectric element. . Also, the through hole 12
Inside the igniter 13, thermocouples 21 are arranged in parallel at intervals radially outward of the mixing tube 1. Through hole 1
The peripheral portion of 2 is formed into a stepped shape, and serves as a stepped portion 14. On the other hand, on the lower surface of the upper surface portion 3 of the burner top 2, an auxiliary combustion chamber 15 is formed by hanging a substantially U-shaped hanging wall 24 that is open outward. A through hole 23 is formed in the back wall 22 of the sub-combustion chamber 15, so that fuel gas can be introduced into the sub-combustion chamber 15 from the nearest supply hole 5. Therefore, the U-shaped hanging wall 24 of the auxiliary combustion chamber 15
The lower surface of the protrusion 11 is placed on the receiving step 14 on the periphery of the through hole 12 to position the mixing pipe 1 and the burner top 2 in the circumferential direction. The burner top 2 is placed on the protruding part 16 of the mold, and the lower end surface of the cylindrical part 10 is placed on the recessed receiving surface 17 at the center of the mixing tube 1. It has been done.

According to such a configuration, an operation button (not shown)
is pushed in and rotated to open a valve (not shown) provided in the middle of the gas supply pipe 40 connected to the mixing pipe 1, and ignition is performed in the sub-combustion chamber 15 using the ignition device 13 using a piezoelectric element. ,
Ignition occurs in the outer flame hole 6 and the inner flame hole 4 by the secondary combustion flame. Then, when the user releases the operating button, the operating button is returned by the spring force, and the valve attempts to return to the closed state by the spring, but the thermocouple 21 receives heat from the ignition state of the secondary combustion flame. The electromotive force suppresses the operation of the valve in the closing direction and maintains the valve in the open state. A known structure for operating the valve using the thermocouple 21 is used. In such a case, even though the thermocouple 21 has entered the sub-combustion chamber 15 and the sub-combustion flame is ignited, the thermocouple 21 will not operate, and the thermocouple 21 will operate reliably to close the valve. It will not close unexpectedly.

[Effect of idea]

In summary, the present invention provides a press-molded mixing tube with an upper annular curved portion into which the lower surface of the burner top and its fitting protrusion can be inserted and which forms a supply hole for the burner top. is formed on the upper plate, a lower annular curved part that can constitute an annular cavity is formed in the lower plate opposite to the upper annular curved part, and the upper and lower plates are connected at the edges of the respective central holes, Since the conventional annular plate interposed between the upper and lower plates can be omitted, in other words, only the press-molded upper and lower plates are connected, positional deviation at the connection point can be almost eliminated, making the connection work easier. It is possible to prevent deformation of the center hole of the mixing tube of the press-formed product, improve the fit to the burner top, and increase the commercial value. In the part, the curved lower plate part is overlapped with the inner surface of the upper plate to form a double part, a through hole is formed in this double part, and an ignition device is placed in the through hole to form a double part. Since the ignition device is attached and held, it has the advantage that the ignition device can be held firmly, its positional accuracy can be easily achieved and maintained, and the ignition device can perform the ignition operation in a predetermined manner.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a mixing tube according to an embodiment of the present invention;
Figure 2 is a sectional view of the same as above, Figure 3 is a side view of the same as above,
Figure 4 is a plan view of the burner top as above, Figure 5 is a sectional view of the same as above, Figure 6 is a bottom view of the same as above, Figure 7 is a sectional view taken along the line A-A in Figure 5, and Figure 8 is the same as above. B in Figure 5
-B sectional view, Fig. 9 is a sectional view of the mixing tube with the burner top mounted on it, Fig. 10 is a partial front view of Fig. 5, Fig. 11 is a plan sectional view of the same as above,
The figure is a schematic cross-sectional view of a conventional example, where 1 is a mixing tube, 2
1 is a burner top, 7 is a lower plate, 8 is an upper plate, 39 is an upper annular curved portion, 18 is an annular cavity, 25 is a fitting projection, and 29 is a lower annular curved portion.

Claims (1)

[Scope of utility model registration request] A gas burner consisting of a mixing tube for mixing fuel gas and primary air and a burner top placed on top of the mixing tube.A fitting protrusion is hung around the periphery of the central hole of the burner top, and the mixing tube is pressed. To make a molded product, an upper annular curved portion is formed on the upper plate, into which the lower surface of the burner top and its fitting protrusion can be inserted and mounted, and a supply hole for the burner top is formed. A lower annular curved part capable of forming an annular cavity part is formed in the lower plate opposite to the annular part, the upper and lower plates are connected at the respective center hole edges, and in a part of the circumferential direction of the annular cavity part, A double portion is formed by overlapping the curved lower plate portion on the inner surface of the upper plate, a through hole is formed in the double portion, and an ignition device is attached to and held in the double portion with the igniter placed in the through hole. A gas burner consisting of