JPH0581812B2 - - Google Patents

Abstract

A water heater (10) having a tank wall (12) and a bottom head (14) welded to the wall to provide a liquid tight chamber (16) therein. The bottom head has an upwardly directed circular flange (32) with a central opening therein. The flange (32) is connected to a flue tube in a unique manner. The connection between the flange (32) on the lower head and the flue tube (28) is accomplished by press-fitting the flange into the end of the tube and then welding the two parts together by a weld between the end of the tube and the outer surface of the flange (32).

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to water heater structures, particularly gas or oil-fired water heaters in which dripping of condensate onto the burner is eliminated.

Description of the Prior Art Condensate dripping onto the burner in gas or oil fired water heaters has been a problem in the industry for many years. Previous attempts to solve this problem have been made in U.S. Pat.
Described in No. 4372290.

In any of the above conventional examples, as shown in FIG.
At the same time, the cylindrical upper end 103 protruding upward of the bottom part 102 is fitted and welded to the outer diameter of the furnace tube 101, thereby forming a tank chamber 104 that accommodates the water to be heated, and furthermore, this tank The combustion chamber 105 in the lower part of the chamber is provided with a burner 106 for heating the water in the tank chamber.

In U.S. Patent No. 3,124,108, asbestos (numeral 55 in the same publication) is placed on the top surface of the burner.
If water vapor in the gas condenses on the inner surface of the furnace cylinder and becomes water, and the condensate drips from the bottom end of the furnace cylinder as water droplets 107 as shown in Figure 3, asbestos will absorb this. This prevents the flame from extinguishing upward from the side of the burner.

Further, in U.S. Pat. No. 4,372,290, the upper surface of the burner is provided with grooves (number 56 in the same publication), openings (also 60, 62, 64), and grooves (also 78, 8).
0, 82) are machined and provided, and these guide the condensate that has dripped onto the top surface of the burner and discharge it to the outside of the burner. This prevents the data from disappearing.

Problems to be Solved However, even with the above conventional example, there is a serious practical drawback in that as long as water droplets fall on the top surface of the burner, it is impossible to completely eliminate the possibility that the flow of condensed water will extinguish the flame. Moreover, it is troublesome to arrange and replace asbestos, and it is also troublesome to process grooves, grooves, etc. on the burner, resulting in high costs.

Arrangement of the Invention for Solving the Problems The present invention solves the above-mentioned drawbacks of the prior art, and its arrangement is such that the top and bottom parts 14 are welded to form a liquid-tight chamber 16 containing the water to be heated. a combustion chamber 20 disposed below the bottom portion 14; a burner 18 provided in the combustion chamber; and a cylindrical lower end portion 36 having an opening. a centrally disposed furnace tube 28 fixedly connected to the bottom 14 so as to communicate with the combustion chamber; The cylindrical upper end portion 32 is press-fitted from below into the inner periphery of the cylindrical lower end portion 36 of the furnace tube 28 by a predetermined dimension, and the furnace tube 28 is fitted into the inner periphery of the cylindrical lower end portion 36 of the furnace tube 28. 36 and the cylindrical upper end 3 of the bottom 14
The water heater is fixed to the bottom part 14 by welding 34 between the outer surface of the water heater 2 and the outer surface of the water heater 2.

According to the above configuration, the condensate consisting of water droplets flowing down the inner surface of the furnace cylinder hits the upper edge of the cylindrical upper end, and then flows down along the inner surface of the cylindrical upper end.
Furthermore, the surface tension of the water causes it to flow radially outward along the inner surface of the bottom member, and this condensate does not drip from the bottom surface of the bottom member until it reaches a point outside the perimeter of the burner.

Embodiment The water heater 10 has a furnace tube 28 disposed at the center inside the tank wall 12, and a dish-shaped bottom 14 and a top (not shown) at the bottom and top of the tank wall 12, respectively.
A liquid-tight chamber 16 is formed between the tank wall 12 and the furnace cylinder 28, and between the top and the bottom.
is formed.

A gas (or oil) burner 18 of suitable construction is arranged in the combustion chamber 20 below the bottom part 14 .
A thermal insulation layer 22 and a jacket 24 are attached around the tank wall 12. The bottom portion 14 has a cylindrical upper end portion 32 in its central portion, and the cylindrical upper end portion 32
is provided with a central opening 26 that projects upwardly.

This cylindrical upper end portion 32 is press-fitted into the inner periphery of the cylindrical lower end portion 36 of the furnace cylinder 28 from below by a predetermined dimension. Furthermore, the outer surface of the cylindrical lower end 36 of the furnace tube 28 and the outer surface of the cylindrical upper end 32 of the bottom section 14 are connected by the welded portion 34, whereby the furnace tube 28 is bonded and fixed to the bottom section 14.

Additionally, a deflecting member 30 of a suitable structure is attached within the furnace tube 28. Additionally, the upper end of the furnace tube 28 is secured to the top of the tank in a suitable manner (not shown).

According to the above configuration, as shown in FIGS. 1 and 2, the condensate flowing down on the inner surface 38 of the furnace tube 28 hits the upper edge 42 of the cylindrical upper end 32, and then It flows down the inner surface 26 of the section 32 and further down the lower surface 40 of the bottom section 14 as shown by the dotted arrow in FIG.
and continues to flow radially outward along this line. Due to the surface tension of the water, the condensate does not drip from the surface 40 until it reaches a point further radially outward from the burner 18 periphery. In this way, condensate dripping into the burner and the problems associated therewith are eliminated.

Effects of the Invention As described above, according to the present invention, it is possible to completely prevent condensate from dripping into the burner, significantly improving reliability, and eliminating the need to provide asbestos or process the burner. Although it has a simple configuration, it has the advantage that its practical effects are extremely large.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing a water heater constructed according to the present invention, FIG. 2 is a diagram explaining its function, and FIG.
The figure is a diagram explaining the functions of a conventional water heater. 10... Water heater, 12... Tank wall, 14...
Bottom, 16...Liquidtight chamber, 18...Gas burner, 20...Combustion chamber, 26...Central opening, 28...
...Furnace cylinder, 32...Cylindrical upper end, 34...Welded portion.

Claims (1)

[Scope of Claims] 1. A tank chamber 12 whose top and bottom parts 14 are welded to form a liquid-tight chamber 16 containing water to be heated; a combustion chamber 20 disposed below said bottom part 14; and said combustion chamber. a centrally located furnace tube having a burner 18 disposed therein, and a cylindrical lower end portion 36 having an opening, the cylindrical lower end portion 36 being bonded and fixed to the bottom portion 14 such that the cylindrical lower end portion 36 communicates with the combustion chamber; 28. The bottom portion 14 has a cylindrical upper end portion 32 at its center that projects upward and has a central opening 26 , and the cylindrical upper end portion 32 extends downwardly from the inner periphery of the cylindrical lower end portion 36 of the furnace tube 28 . The furnace tube 28 is press-fitted by a predetermined dimension from the outer surface of the cylindrical lower end portion 36 of the furnace tube 28 and the cylindrical upper end portion 3 of the bottom portion 14.
The water heater is joined and fixed to the bottom part 14 by welding 34 between the outer surface of the water heater 2 and the outer surface of the water heater 2.