JPS62404B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to supply and exhaust pipes for combustion appliances,
The purpose is to prevent pressure loss in the supply and exhaust pipes.

Conventional air supply and exhaust pipes used in combustion appliances have the structure shown in FIG. 2 to adjust their length, and therefore have the following drawbacks.

That is, first and second supply and exhaust cylinder bodies 5 and 6 each having an inner cylinder 1 and 2 and an outer cylinder 3 and 4 are provided,
The inner cylinders 1 and 2 and the inner cylinders 3 and 4 are fitted together.

In this structure, in order to maintain airtightness between the inner cylinders 1 and 2 and the outer cylinders 3 and 4, the inner cylinder 1 is provided with an annular groove 1a projecting outward from the periphery.
The structure is such that an O-ring 7 is attached to a.

However, in this structure, the outer cylinder 4 passage in the annular groove 1a becomes narrower,
A pressure loss occurs here.

As a result, problems arise, such as combustion compression in the burner section or an increase in the size of the blower to avoid this.

Therefore, the present invention provides an annular groove protruding outward from the periphery in the outer cylinder portion opposite to the annular groove provided in the inner cylinder,
This is an attempt to eliminate the above-mentioned conventional drawbacks.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, 8 is the first supply and exhaust pipe main body,
The main body 8 is formed of a first inner cylinder 8a and a second outer cylinder 8b, each having a plurality of holes A and A' formed in its tip wall.

9 is a second supply and exhaust pipe main body;
It is formed by an inner cylinder 9a and a second outer cylinder 9b.

Then, the inner cylinders 8a and 9a and the outer cylinders 8b and 9b are fitted together as shown in FIG. 1, and thereby the first and second supply and exhaust cylinder bodies 8 and 9 are connected. It is becoming more and more popular.

In the above configuration, combustion air is drawn into the space 10 from the hole A, and then supplied to the burner section (not shown), and then the exhaust gas from this burner section is discharged through the space 11 to the hole A'. If this exhaust gas mixes with the combustion air flowing through the space 10, incomplete combustion will occur in the burner section.

Therefore, in order to prevent this mixing, the first inner cylinder 8a has a first annular groove 8 that protrudes outward from the periphery.
a' is provided, and an O-ring 12 is installed in this annular groove 8a' to provide a sealed structure.

However, if only the annular groove 8a' is provided, the opening area of the space 10 will be narrowed, resulting in combustion compression in the burner section.

Therefore, in the present invention, a first annular groove 8a' protruding outward from the peripheral edge is provided in the first inner cylinder 8a of the first supply/exhaust cylinder main body 8, and a first supply/exhaust pipe opposite to this annular groove 8a' is provided. The first outer cylinder 8b of the exhaust pipe body 8 is provided with a second annular groove 8 that protrudes outward from the periphery beyond the wall thickness of the outer cylinder 8b.
b' was provided, and the second annular groove 8b' was used as a stopper for the second outer cylinder 9b.

For this reason, the opening area of the first annular groove 8a' is not narrowed, and problems such as combustion compression are no longer caused.

As described above, according to the present invention, the opening area of the ventilation passage does not become narrower due to the annular groove for mounting the O-ring.

Therefore, practical effects such as combustion compression in the burner section and the need to increase the size of the blower to avoid this compression are achieved.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing essential parts of an air supply and exhaust pipe of a combustion appliance according to an embodiment of the present invention, and FIG. 2 is a partially cutaway front view of a conventional example. 8...First supply/exhaust pipe main body, 8a...First inner cylinder, 8b...First outer cylinder, 8a'...First annular groove, 8b'...Second annular groove, 9 . . . second supply and exhaust cylinder main body, 9a . . . second inner cylinder, 9b . . . second outer cylinder.

Claims (1)

[Claims] 1. Fit the inner cylinders and outer cylinders of the first and second supply and exhaust pipe bodies, each of which has an inner cylinder and an outer cylinder, and fit the inner cylinder of the first supply and exhaust pipe main body to the outside of the periphery. A first annular groove protruding toward the outer cylinder is provided, and a second annular groove protruding outward from the periphery by a wall thickness of the outer cylinder wall is provided in the outer cylinder of the first supply/exhaust cylinder body facing the annular groove. An air supply and exhaust pipe for a combustion appliance, in which the second annular groove serves as a stopper for the second outer cylinder, and an O-ring is attached to the first annular groove.