JPH0518604Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application and Outline of the Invention] The present invention is a combustion chamber see-through window of a combustion appliance, in particular, simplifies its structure and makes the see-through window portion sufficiently airtight and mounting strength. It is something.

[Prior art and its problems] Combustion appliances, especially combustion appliances in which a gas burner is housed in a sealed combustion chamber, require transparent viewing on the constituent walls of the combustion chamber in order to confirm the combustion state of the gas burner during repair and inspection. It has a window.

The structure of this conventional see-through window is as shown in FIG. 5, in which a window part consisting of a sealing packing P, a heat-resistant glass plate 21, and a window frame 22 is installed in an opening 11 formed in a wall 1 forming a combustion chamber. A configuration is adopted in which the opening 11 is closed with screws.

In this conventional type, although there is a possibility that a slight leakage may occur at the threaded part of the mounting screws 23, 23, this degree of leakage does not pose a practical problem, and when the heat-resistant glass plate 21 is installed, Leakage between the plate 21 and the surface of the component wall 1 is reliably prevented, and the gas burner inside the combustion chamber can be seen through the opening of the window frame 22 and the opening 11, allowing the combustion state of the burner to be confirmed from the outside.

However, in this conventional device, the configuration of the see-through window is complicated and productivity is insufficient, and the number of parts is large, making this part expensive.

The present invention provides a "combustion chamber see-through window for a combustion appliance in which the opening 11 of the constituent wall 1 of the combustion chamber is closed with a transparent body", after ensuring sufficient airtightness of the see-through window. The objective is to simplify the configuration and increase productivity.

[Technical Means] The technical means of the present invention taken to solve the above problem is ``The formation area of the opening 11 of the component wall 1 is the bottom wall of the recessed part 12, and the transparent plate 20 is fitted into this recessed part 12. A washer 24 having an opening 25 smaller than the outer diameter of the transparent plate 20 is press-fitted from the outer surface of the transparent plate 20 so as to be in close contact with the transparent plate 20,
The peripheral edge of the washer 24 is partially bitten into the peripheral wall of the concave portion 12 in a one-way engagement state.

[Operation] The above technical means of the present invention operates as follows.

The structure of the see-through window is composed only of the transparent plate 20 and the washer 24, and the concave portion 12 of the constituent wall 1 serves as the mounting structure for these parts, and the number of parts is reduced compared to the conventional one.

In addition, when the transparent plate 20 and the washer 24 are attached, the transparent plate 20 fits into the recessed part 12;
The washer 24, which is attached from the outside, is press-fitted into the recessed portion 12 and is in close contact with the transparent plate 20 in this press-fitted state. Therefore, the opening 11 is closed by the transparent plate 20, and the gap between the closed portion is formed by press-fitting the peripheral edge of the washer 24 and the peripheral wall of the concave portion 12 into close contact, and the outer surface of the transparent plate 20 and the inner surface of the washer 24. It is sealed by close contact with. In other words, these close contact parts ensure sufficient airtightness to the degree required for the combustion chamber.

Further, during combustion, thermal stress is generated in the constituent wall 1, but since the peripheral edge of the washer 24 is one-way engaged with the peripheral wall of the concave portion 12 in a one-way manner to prevent it from coming off, even under the conditions where the thermal stress occurs. , transparent plate 20
And there is no need to worry about the washer 24 coming off.

[Effects] Since the present invention has the above configuration, it has the following unique effects.

Since the number of parts is reduced, the structure of the see-through window is simplified and the manufacturing cost required for the structure of the see-through window is reduced accordingly.

Even if the structure is simplified, the attachment strength of the see-through window portion is sufficient, and the airtightness of this portion is equal to or better than that of the conventional one.

It is also possible to press and fix the transparent plate 20 by spot welding the washer 24 to the constituent wall 1, but in this case, welding marks will be created on the combustion chamber constituent plates, and heating and cooling will be affected. Although there is a risk that the portion of the wall 1 that is repeatedly constructed will corrode or rust over time, the above-described structure of the present invention eliminates this inconvenience.

Furthermore, when attaching the transparent plate 20 with the washer 24, the washer 24 is simply press-fitted.
This installation work is also easy and has high workability.

[Example] Examples of the present invention will be described above with reference to FIGS. 1 to 4.

In the embodiment shown in FIGS. 1 to 3, the opening 11 and the transparent plate 20 are circular, and the transparent plate 2
0 and the transparent plate 2
A washer 24 having an opening 25 for press-fixing the 0 is also configured in a circular shape. A plurality of convex pieces 26, 26 are protruded around the washer 24, and the convex pieces 26 are slightly inclined toward the open end side of the concave portion 12.
The circumscribed circles of the tip portions 6 and 26 are set to be slightly larger than the inner diameter of the recessed portion 12.

The cross-sectional shape of the recessed portion 12 is formed as shown in FIG. 2, and at least the portion near the opening 11 of the bottom wall in which the opening 11 is formed is a flat portion, and the transparent plate 20 is placed in opposition to this flat portion. to accommodate. In this embodiment, the transparent plate 20 is made of mica, and a washer 24 is press-fitted from the surface side of the transparent plate 20 into the concave portion 12 in which the transparent plate 20 is accommodated. Then, as shown in the figure, the washer 24 and the transparent plate 20 are in an overlapping state.

During this press-fitting, since the convex pieces 26, 26 are slightly inclined toward the open end side of the concave portion 12, the washer 2
4, the protruding pieces 26, 26 are press-fitted into a one-way engaged state, and, however, the protruding pieces 26, 2
From the dimensional relationship between the circumscribed circle of 6 and the inner diameter of the concave portion 12, the tips of these convex pieces 26, 26 are located at the concave portion 12.
It will bite into the inner circumferential wall of the housing to prevent it from coming off.

In addition, when press-fitting the washer 24, after temporarily press-fitting the washer 24 in such a state that the central part of the washer 24 is in close contact with the transparent plate 20, as shown in FIG. When the transparent plate 20 is pushed toward the bottom wall of the recess 12, the transparent plate 20 is more firmly held between the washer 24 and the bottom wall of the recess 12.

The see-through window in this example was formed in the constituent wall 1 of the combustion chamber formed below the heat exchanger of the water heater, as shown in FIG. It may also be formed in the combustion chamber of the appliance.

In addition, as a method of press-fitting the washer 24, in addition to the method of the above embodiment, the concave portion 12 can be press-fitted by one press-fitting.
A method of deforming so that the curvature of the circular arc cross section of the peripheral edge of the bottom wall of the bottom wall becomes smaller, so that the tips of the convex pieces 26, 26 fit into the peripheral wall of the concave part 12 (see Fig. 4). Needless to say, it can also be adopted. In short, any press-fitting method can be used as long as the convex pieces 26, 26 of the washer 24 are forced into the peripheral wall of the concave portion 12 in a manner that prevents them from coming off. Further, as the transparent plate 20, heat-resistant glass can be used in addition to the above-mentioned mica, but the use of mica has the advantage that the transparent plate 20 is less likely to be damaged even if there is variation in the pressing force during caulking.

The shape of the concave portion 12, the shape of the transparent plate 20, and the shape of the washer 24 can be made into a rectangular shape or other shapes other than the circular shape of the above embodiment, and the shape of the convex pieces 26, 26 can also be made into other shapes. The shape can be considered.

[Brief explanation of the drawing]

Fig. 1 is an exploded view of the embodiment of the present invention, Fig. 2 is a cross-sectional view of the main parts thereof, Fig. 3 is a cross-sectional view of the main parts in the press-fitting state, Fig. 4 is an explanatory diagram of another press-fitting method, FIG. 5 is an explanatory diagram of a conventional example, and in the figure, 1... component wall, 11... opening, 12... recessed part, 20... transparent plate, 24... washer, 25... opening.

Claims (1)

[Scope of utility model registration request] In a combustion chamber transparent window of a combustion appliance in which an opening 11 of a constituent wall 1 of the combustion chamber is closed with a transparent body,
The region where the opening 11 of the constituent wall 1 is formed is the bottom wall of the recessed part 12, and the transparent plate 20 is fitted into this recessed part 12,
A washer 24 having an opening 25 smaller than the outer diameter of the transparent plate 20 is press-fitted from the outer surface of the transparent plate 20 so as to be in close contact with the transparent plate 20.
A combustion chamber viewing window for a combustion appliance, in which a peripheral edge of No. 4 is partially wedged into the peripheral wall of the recessed portion 12 in a one-way engagement state.