JP2000320745A - Kindling pipe of gas appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and firmly attach a nozzle to a pipe main body in a kindling pipe for ignition in gas appliance. SOLUTION: Two bars of annular grooves 6, 7 are formed in an insertion part 3b which enters a pipe main body 2 in a nozzle 3, and a tip part of the pipe main body 2 is annularly caulked for the annular grooves 6, 7 of the nozzle 3. Consequently, it is possible to reduce time and labor required for machining the nozzle 3 and the pipe main body 2 and time and labor required for mounting the nozzle 3 on the pipe main body 2 and prevent the generation of rust because a resin layer 4 remains over whole length on an inner face of the pipe main body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of an ignition seed tube for a gas appliance such as a gas range (gas stove), gas stove, gas water heater, or gas burner.

[0002]

2. Description of the Related Art In general, an ignition seed tube for a gas appliance has a structure in which a nozzle made of brass or the like constituting a crater is attached to a tip of a pipe body for rust prevention or the like.
In addition, the inner surface of the pipe body is often coated with a resin for rust prevention.

Conventionally, as a means for attaching the nozzle to the pipe body, as shown in FIG. 5, a female screw is formed on the inner surface of the distal end portion of the pipe body P, while a male screw N1 is formed partially on the outer periphery of the nozzle N. Then, the nozzle N was screwed into the tip of the pipe body P. In this case, although not shown in the figure, the male screw N of the nozzle N is used to prevent gas leakage.
An adhesive was applied to the joint surface between the pipe 1 and the internal thread of the pipe body P.

[0004]

This conventional technique has an advantage that the nozzle N can be firmly attached to the pipe main body P. However, this conventional technique is used for processing the male thread N1 on the nozzle N and the female thread on the pipe main body P. It is troublesome, and since it is necessary to apply an adhesive to the male screw N1 and screw it in, the mounting of the nozzle N is also troublesome.

Further, since the resin layer C on the inner surface of the pipe main body P is scraped off by machining the internal thread, if the adhesive deteriorates due to heat or the like, moisture penetrates into the mating surface between the nozzle N and the pipe main body P. There is also a problem that the inner surface of the pipe body P is easily corroded, and therefore has poor durability.

[0006] The object of the present invention is to solve these problems.

[0007]

The pilot tube according to the present invention comprises a pipe body for supplying a pilot gas and a nozzle partially or wholly inserted into the tip of the pipe body. Forming an annular groove in a portion of the nozzle inserted into the pipe body, and caulking a portion of the pipe body corresponding to the annular groove of the nozzle over the entire circumference of the annular groove of the nozzle. Is characterized by

In this case, it is preferable that a plurality of annular grooves are formed in the nozzle, and the pipe body is swaged at a plurality of locations corresponding to the number of annular grooves of the nozzle.

[0009]

According to the present invention, the nozzle is attached to the pipe body by caulking the pipe body, that is, deforming the pipe body radially inward and fitting it into the annular groove of the nozzle. Therefore, the nozzle,
It can be attached to the pipe body in a tight and tightly sealed state.

[0010] Further, since the nozzle has only an annular groove formed on the outer periphery thereof, the processing time can be reduced as compared with the prior art in which a male thread is formed. Since the step of applying the agent is not required, the labor required for processing and assembling the member can be reduced as compared with the related art.

Furthermore, since it is not necessary to cut the inner surface of the pipe main body, when the inner surface of the pipe main body is coated with a resin layer (rust prevention layer), the rust prevention function of the resin layer is not impaired. As a result, the inconvenience that the joint portion with the nozzle on the inner surface of the pipe body gradually becomes rusted can be eliminated, and the durability can be remarkably improved as compared with the related art.

[0012]

Next, embodiments of the present invention will be described with reference to the drawings. 1 to 3 show a first embodiment, in which FIG. 1 is a front view of a separated state, and FIG.
2 is a sectional view taken along line II-II, and FIG. 3 is a partially cutaway front view.

The seed tube 1 includes a pipe body 2 having an appropriate length,
And a nozzle 3 attached to the tip. The pipe body 2 is made of a high-strength metal such as iron, and its inner surface is coated with a resin layer 4 for rust prevention. On the other hand, the nozzle 3 is made of a non-rusting metal such as brass, and has a gas ejection hole 5 extending along the axis.

The nozzle 3 is composed of an exposed portion 3a having a diameter larger than the inner diameter of the pipe body 2 and an insertion portion 3b fitted into the tip of the pipe body 2. The outer peripheral surface of the insertion portion 3b has
First and second two annular grooves 6 and 7 are formed. Of these, the first annular groove 6 located closer to the outside is the exposed portion 3a.
It is in a state of being connected to.

[0015] Then, as shown in FIG.
Of the tip portion of the nozzle 3 is depressed radially inward with a pressing tool (not shown) such as a die or a die, thereby deforming the pipe body 2 at two locations. The first and second two inwardly extending annular projections 8 that are in close contact with the inner peripheral surfaces of the two annular grooves 6 and 7 of the nozzle 3 are provided at the distal end of the pipe body 2. ,
9 is recessed.

In this embodiment, since the first annular groove 6 is provided continuously with the exposed portion 3a, the first annular groove 6 is fitted into the first annular groove 6.
The annular projection 8 is formed on the tip edge of the pipe body 2,
For this reason, the tip of the pipe main body 2 is in a constricted state. As can be easily understood from the above description, in the present invention, since the pipe main body 2 is caulked to the nozzle 3, the mounting strength of the nozzle 3 to the pipe main body 2 is high, and the pipe main body 2 is connected to the nozzle 3. Insertion part 3b of 3
Therefore, the space between the nozzle 3 and the pipe body 2 can be tightly sealed without using an adhesive (sealant).

Further, it is sufficient to simply form the annular grooves 6 and 7 in the nozzle 3 in advance and the processing is simple, and it is not necessary to perform a pre-processing such as a female thread on the pipe body 2. In addition, the need for a step of applying an adhesive is not required, so that the work of attaching the nozzle 3 can be reduced. Moreover, since the resin layer 4 on the inner surface of the pipe body 2 remains over the entire length, the fitting portion of the pipe body 2 with the nozzle 3 is rusted or corroded by gas or moisture contained in air. However, as a result, high durability can be ensured.

FIG. 4 shows a second embodiment. As in this example, the first annular groove 6 may be slightly separated from the exposed portion 3a, but the tip of the pipe body 2 is easily plastically deformed. Therefore, when the distal end edge of the pipe main body 2 is crimped as in the first embodiment, there is an advantage that the sealing performance and the mounting strength are excellent.

Although the embodiment of the present invention has been described above, the present invention is not limited to the illustrated embodiment, and can be embodied in various modes. For example, the number of annular grooves in the nozzle is not limited, and may be one or three or more.
It may be set according to the length of the nozzle, the wall thickness of the pipe body, etc. (However, in the case of general gas appliances, the balance between the nozzle size and the point of maintaining the sealing performance and mounting strength and
Articles are preferred).

Also, the depth dimension of the annular groove can be appropriately set according to the wall thickness and the material of the pipe body. When a plurality of annular grooves are formed, the groove width dimension and the depth dimension of the annular grooves are determined. It may be different. Further, the annular groove may be formed in a circular arc shape or a V shape. Furthermore, the inner surface of the pipe body is not necessarily coated with a resin layer, but a rustproof metal tube may be lined or a plated layer may be applied.

[Brief description of the drawings]

FIG. 1 is an exploded view of a seed tube according to a first embodiment.

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

FIG. 3 is a partially cutaway front view in a state where a nozzle is attached.

FIG. 4 is a partially cutaway front view showing a second embodiment.

FIG. 5 is a diagram showing a conventional example.

[Explanation of symbols]

 1 type fire tube 2 pipe body 3 nozzle 4 resin layer 6,7 annular groove 8,9 inward annular protrusion

Claims (1)

[Claims] 1. A pipe main body for supplying a pilot gas, and a nozzle partially or wholly inserted into a tip of the pipe main body, wherein a portion of the nozzle inserted into the pipe main body. A pilot pipe for a gas appliance, wherein a portion of the pipe body corresponding to the annular groove of the nozzle is caulked over the entire circumference of the annular groove of the nozzle while forming an annular groove in the pipe body. .