JPH0238207Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to the structure of a combustion chamber in a water heater such as an instantaneous gas water heater.

[Conventional technology]

The structure of the combustion chamber in a conventional water heater is as follows:
As shown in FIG. 5, the water supply pipe 11' to the heat exchanger 10' is wrapped around the outer peripheral surface of the inner shell 1', and the water flowing through the water supply pipe 11' cools the inner shell 1'. However, in the case of a combustion chamber with this structure, if the fire is re-ignited immediately after being extinguished by boiling water, the water in the wound water supply pipe 11' will rise in temperature due to the residual heat from heating in the inner shell. However, a so-called after-boiling phenomenon occurs.
Therefore, when the tap was opened, this high-temperature water was discharged, posing a risk of accidental burns. Therefore, the winding of the water supply pipe 11' around the outer circumference of the inner shell was eliminated, and as shown in FIG.
3' has been proposed, but there are problems with durability and it is not sufficient to prevent the after-boiling phenomenon. In addition, in Figures 5 and 6, 3' is the casing, 9' is the main burner, and 12' is the casing.
is the outlet pipe.

[Purpose of invention]

This invention provides a combustion chamber structure for a water heater that eliminates the various drawbacks of the conventional water heater, such as effectively preventing the after-boiling phenomenon by constantly and efficiently cooling the inner shell with cooling air from a forced fan. It is something to do.

[Structure of the idea]

Its structure consists of integrally forming a large number of ventilation inlet ports 2 with upward blowout openings 2a along the inner wall on the peripheral wall of the inner shell 1 by cutting and using other means, and a main burner surrounding the inner shell. Communication hole 7 to
hermetically surrounded by a ventilation gap 4 having a
This invention relates to a structure of a combustion chamber of a water heater characterized in that cooling air from a forced fan F is guided to constantly cool an inner shell 1 with the cooling air from the forced fan F. be.

〔Example〕

An embodiment of the structure of a combustion chamber in a water heater according to this invention will be described below with reference to the drawings. In Figs. 1 to 4, 1 is an inner shell, and an upwardly directed blow-off opening 2a is formed in the peripheral wall of the inner shell along the inner wall. A large number of ventilation inlet ports 2 are formed at predetermined intervals vertically and horizontally in a scattered manner. In the embodiment, the ventilation inlet 2 is integrally formed by cutting and cutting, but it is of course possible to form an integrally formed pocket by fixing a separately formed pocket to the inner surface of a through hole bored in the peripheral wall. . The inner shell 1 is covered with a casing 3 on its outer surface, and there is a ventilation gap 4 between the inner shell 1 and the casing 3.
A ventilation duct 5 from a forced fan F is connected to one side of the upper part of the ventilation gap 4, and a partition plate 8 with a communication hole 7 is provided between it and the main burner chamber 6 at the lower part. The outer circumferential surface of the inner shell 1 is sealed with a ventilation gap 4 in between, and the cooling air from the forced fan F is guided to the ventilation inlets 2 through the ventilation duct 5 and the ventilation gap 4, and from each ventilation inlet 2. The cooling air is injected upward into the inner wall of the inner shell 1 to uniformly cool each part of the inner shell 1, and the secondary combustion air of the main burner 9 installed in the main burner chamber 6 at the bottom of the inner shell 1 is used. Air is also supplied through the communication hole 7.

In the embodiments shown in FIGS. 1 to 3, the ventilation inlet 2 is formed vertically, but if the ventilation inlet 2 is inclined inward as in the embodiment shown in FIG. Since the air injected from the port 2 efficiently contacts the inner surface of the inner shell 1, the purpose can be achieved with a small amount of ventilation, which is useful in practice. In the figure, 10 is a heat exchanger provided in the upper part of the inner shell 1, 11 is a water supply pipe, and 12 is a hot water outlet pipe.

[Effect of idea]

As explained above, this device has a simple structure in which a large number of ventilation inlets with upward openings are provided along the inner wall of the inner shell, and cooling air from a forced fan is guided into the ventilation inlets. Since the cooling air is blown upward along the inner wall of the inner shell, it is always efficiently cooled, which not only prevents the afterboiling phenomenon, but also prevents the inner shell from being heated to a high temperature. can be made from a thin steel plate or the like, thus reducing its weight and cost. Also,
The large number of scattered ventilation inlets increases the rigidity of the inner shell and improves its durability, resulting in superior effects never seen before.

[Brief explanation of the drawing]

Figure 1 is an overall longitudinal sectional front view showing an example of the structure of the combustion chamber of a water heater according to this invention, Figure 2 is a cross-sectional plan view of only the inner shell, and Figure 3 is a sectional view of the ventilation inlet. , FIG. 4 is a sectional view showing a different shape of the ventilation inlet, and FIGS. 5 and 6 are configuration diagrams of a conventional example. 1...Inner body, 2a...Upward blowing opening,
2...Vent introduction port, 3...Casing, F...Forced fan.

Claims (1)

[Scope of utility model registration request] A large number of ventilation inlet ports 2 with upwardly directed air outlet openings 2a are integrally formed on the peripheral wall of the inner shell 1 by cutting out and other means along the inner wall, and communication holes to the main burner are formed around the inner shell. A structure of a combustion chamber of a water heater, characterized in that the combustion chamber is hermetically surrounded by a ventilation gap 4 having a ventilation gap 7, and cooling air from a forced fan F is introduced into the ventilation gap 4.