JP3537579B2 - Burner nozzle device and method of manufacturing elbow block - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a nozzle device applied to a burner for a stove or the like.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a gas outlet b of a valve housing a of a valve unit for controlling gas supply to a burner.
A die-cast elbow block having a base portion e fastened to the seat surface c with packing d via a packing d and an elbow portion g extending from the base portion e toward the mixing pipe f of the burner is used. , The gas outlet b over the rising portions of the base portion e and the elbow portion g from the base portion e.
And a downstream passage i communicating with the upstream passage h is formed at a bent portion of the elbow g extending from the rising portion to the mixing pipe f side. A nozzle j machined by cutting is screwed onto the tip of the portion to constitute a nozzle device. In the figure, k denotes a pilot gas outlet, and a cylindrical portion l communicating with the gas outlet k is formed in the elbow block, and a pilot nozzle m is formed in the cylindrical portion l.
Is screwed.

[0003]

In the above-mentioned conventional example, since the cutting nozzle j separate from the elbow block is used, there is a problem that the cost is increased. In view of the above, it is a first object of the present invention to provide a nozzle device in which a nozzle is integrated into an elbow block so that cost can be reduced, and an elbow block can be manufactured at low cost. It is a second object to provide a method described above.

[0004]

In order to solve the above first problem SUMMARY OF THE INVENTION The present onset Ming, base fastened to the seat surface, which opened the gas outlet of the valve housing of the valve unit for controlling the gas supply to the burner Part and an elbow block extending from the base part toward the mixing pipe of the burner . The elbow block is provided with a gas outlet over the rising part of the base part and the elbow part from the base part. In a burner nozzle device that forms an upstream passage that communicates and that is located at a bent portion of an elbow portion that bends from the rising portion to the mixing pipe side to form a downstream passage, the elbow portion includes an upstream passage and a downstream passage. A nozzle hole communicating with the passage and coaxial with the downstream passage is formed, and an air intake hole communicating with the downstream passage is opened in a bent portion of the elbow portion.

According to this configuration, the nozzle is integrated with the elbow block, and the cost is lower than that of the conventional example using a separate cutting nozzle. In the case where a nozzle is provided at the end of the elbow portion as in the conventional example, gas is ejected from the nozzle at a high speed to the mixing tube, so that the primary air is sufficiently sucked into the mixing tube by this gas flow. In the present invention, since the nozzle hole is formed at the back of the downstream passage of the elbow section, the speed of jetting the gas into the mixing tube is reduced, and the suction force of the primary air is reduced. However, in the present invention, since the air intake hole communicating with the downstream passage is provided, the primary air is sucked in the downstream passage by the jet gas flow from the nozzle hole, and the suction power of the primary air to the mixing pipe is weakened. However, primary air shortage does not occur.

[0006] A connecting pipe portion, which communicates with the upstream passage and can be inserted into the gas outlet, is provided on the back surface of the base portion,
The gas outlet is formed in a stepped hole having a large-diameter portion on the seat surface side, an O-ring is provided outside the connection pipe portion, and the O-ring is provided between the base portion and the bottom surface of the large-diameter portion of the gas outlet. If it is configured so as to secure the sealing property between the gas outlet and the elbow block by compressing, the conventional packing becomes unnecessary, and the cost can be further reduced.

[0007] The elbow block is die-cast with a die having a lower die and a pair of split upper dies divided into two parts by a plane including the axis of the elbow part. If all of the downstream passages, nozzle holes, and air intake holes are formed by machining, the manufacturing cost increases.

In order to solve the second problem, in the method of manufacturing an elbow block according to the present invention, a core portion for an upstream passage is formed in a lower die, and a pin for an air hole is formed in a divided upper die. part is formed, further, provided with a core for the downstream passage between a pair of split upper die of forms an upstream passage and the downstream passage and the air hole in the die casting process of the elbow block, then <br The nozzle holes are formed by machining. According to this, the man-hour for machining can be reduced, and the manufacturing cost of the elbow block can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, reference numeral 1 denotes a mixing pipe of a stove burner, and 2 denotes a valve unit for controlling gas supply to the burner. Although not shown, the valve unit 2 incorporates a safety valve, a main valve that is opened and closed by a point fire extinguishing operation, a flow control valve, and a pilot valve that is opened during an ignition operation. A main gas outlet 21 connected to the flow control valve and a pilot gas outlet 22 connected to the pilot valve are formed in the valve housing 20 of the valve unit 2, and the upper gas outlets 21 and 22 of the valve housing 20 are opened. The elbow block 3 is mounted on the seat surface 23 thus set.

The elbow block 3 includes a base portion 30 fastened to the seating surface 23 and a mixing tube 1 rising from the base portion 30.
An elbow 31 extending in a shape of an elbow toward the base, and a pilot nozzle 32 for mounting a pilot burner (not shown) rising from the base 30. The base 30, the elbow 31 and the pilot The nozzle 32 and the nozzle 32 are integrally formed by die casting.

In the elbow block 3, an upstream passage 31b communicating with the main gas outlet 21 is formed over a base portion 30 and a rising portion 31a of the elbow portion 31 from the base portion 30, and an upstream passage 31b is formed from the rising portion 31a. A downstream passage 31d is formed at a bent portion 31c of the elbow portion 31 which is bent toward the mixing tube 1 and extends. And elbow part 3
1, a nozzle hole 31e is formed coaxially with the downstream passage 31d that connects the downstream passage 31d to the upstream passage 31b, and gas from the main gas outlet 21 is supplied to the upstream passage 31b and the nozzle hole 31e.
And into the mixing tube 1 through the downstream passage 31b.

According to this configuration, the nozzle is integrated with the elbow block 3, and the cost is lower than that in which a separate cutting nozzle is screwed to the tip of the elbow section 31.
In the above-described configuration, since the nozzle hole 31e is formed in the deep portion of the downstream passage 31d, the gas ejection speed from the distal end of the elbow portion 31 is reduced, and the suction force of the primary air by the ejected gas flow is weakened. Therefore, in the present embodiment, the elbow unit 3
As shown in FIG. 2, the downstream passage 31
A pair of air intake holes 31f, 31f communicating with the nozzle hole 31e are provided, and a downstream passage 31d is formed in the gas flow ejected from the nozzle hole 31e.
In this case, the primary air from the air intake hole 31f can be mixed by suction.

In the present embodiment, the pilot nozzle portion 32 is formed with a nozzle hole 32a communicating with the pilot gas outlet 22, so that a separate pilot nozzle is eliminated to further reduce the cost. Further, on the back surface of the base portion 30, a connection pipe portion 33 communicating with the upstream passage 31 b and insertable into the main gas outlet 21, and a nozzle hole 32 a
A connecting pipe portion 34 which can be inserted into the pilot gas outlet 22 and communicates with the main gas outlet 21. Further, the main gas outlet 21 and the pilot gas outlet 22 are formed with stepped holes having large diameter portions 21a, 22a on the seat surface side. The O-rings 33a and 34a are extrapolated to the connection pipes 33 and 34, respectively.
The large diameter portion 21 of the base portion 30 and each of the gas outlets 21 and 22
a between the gas outlets 21 and 22a.
The seal between the elbow block 2 and the elbow block 3 is ensured. This eliminates the need for the conventional packing, which is advantageous in reducing costs.

The elbow block 3 has a lower mold 4 as shown in FIG. 3A and a pair of divided upper molds as shown in FIG. 3B divided into two parts by a plane including the axis of the elbow part 31. Die-casting is performed by using a mold having the steps 5 and 5. Then, a core 4a for the upstream passage 31b is formed in the lower mold 4, and a pin 5a for the air intake hole 31f is formed in each divided upper mold 5,
Further, a core 6 for the downstream passage 31d is provided between the pair of divided upper dies 5 and 5, and an upstream passage 31b, a downstream passage 31d, and an air intake hole 31f are formed in a die casting process. According to this, only the nozzle holes 31e and 32a may be formed by machining in a later step, and the manufacturing cost of the elbow block 3 can be reduced.

Although the embodiment in which the present invention is applied to a nozzle device for a burner having a pilot burner has been described above, the present invention can also be applied to a nozzle device for a burner without a pilot burner. As a matter of course, the pilot nozzle part 32 and the connection pipe part 34 become unnecessary.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an example of the apparatus of the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG.

3A is a cross-sectional view showing a molded state of an elbow block, and FIG. 3B is a cross-sectional view taken along line BB of FIG. 3A.

FIG. 4 is a cross-sectional view of a conventional example.

[Explanation of symbols]

1 mixing pipe 2 valve unit 20 Valve housing 21 Gas outlet 23 Seat 3 Elbow block 30 Base part 31 Elbow part 31a rising part 31b upstream passage 31c bent portion 31d downstream passage 31e Nozzle hole 31f Air intake hole 33 Connection pipe part 33a O-ring 4 Lower mold 4a Core part 5 split upper mold 5a pin part 6 core

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-332656 (JP, A) JP-A-7-119846 (JP, A) JP-A-63-130252 (JP, A) 26441 (JP, A) JP-A 57-40826 (JP, U) JP-A 57-36410 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23D 14/48 F23D 14 / 84 F23K 5/00

Claims (3)

(57) [Claims] And 1. A base part fastened to the seat surface, which opened the gas outlet of the valve housing of the valve unit for controlling the gas supply to the bar burner, the elbow portion extending toward the base portion into the mixing tube of the burner The elbow block is formed with an integral, an upstream passage communicating with the gas outlet is formed in the elbow block over a rising portion from the base portion of the elbow portion and the mixing tube side from the rising portion. A nozzle device for a burner, which forms a downstream passage by being located at a bent portion of an elbow portion that extends by bending, wherein a nozzle hole coaxial with the downstream passage, which communicates the upstream passage and the downstream passage, is formed in the elbow portion. A nozzle device for a burner, wherein an air intake hole communicating with the downstream passage is opened in a bent portion of the elbow portion. 2. A connecting pipe portion, which is communicated with an upstream passage and can be inserted into a gas outlet, is provided on a rear surface of the base portion, and
The gas outlet is formed in a stepped hole having a large-diameter portion on the seat surface side, and an O-ring is provided outside the connection pipe portion. The O-ring is provided between the base portion and the bottom surface of the large-diameter portion of the gas outlet. The nozzle device for a burner according to claim 1, wherein the nozzle device is compressed to secure a sealing property between the gas outlet and the elbow block. Te 3. The process for producing odor elbow block for use in a nozzle according to claim 1, an elbow block, and a lower mold, two divided one pair of split upper die on a plane including the axis of the elbow portion Forming a core portion for an upstream passage in a lower die, forming a pin portion for an air hole in a divided upper die, and further forming a pair of divided upper molds. A core for a downstream passage is provided between the molds, and an upstream passage, a downstream passage, and an air hole are formed in a die casting process of an elbow block, and then a nozzle hole is formed by machining. Elbow block manufacturing method.