JPS583005Y2 - solar water heater - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a solar water heater, and particularly to a solar water heater using a heat pipe.

Conventionally, this type of water heater has generally had a condensing section of a heat pipe placed directly inside a hot water storage tank.

However, in the case of this type, it is difficult to create a perfect seal between the heat pipe and the hot water storage tank, leading to the risk of water leakage, and if the heat pipe ruptures, the working fluid may leak into the tank. There is a risk that the stored hot water may become unusable.

In order to solve these problems, the condensing part of the heat pipe may be disposed on the outer surface of the tank wall of the hot water storage tank, but in this case, there is a disadvantage that heat conduction from the condensing part to the hot water storage tank is poor.

This idea was made in view of the above points,
We have had to deal with problems such as water leakage due to seal defects and contamination of hot water storage due to leaked working fluid, so it is important to provide a solar water heater that has excellent heat conduction from the condensing part of the heat pipe to the hot water storage tank. purpose.

In the solar water heater according to this invention, a heat collecting plate having a downward fitting recess is disposed from above in the evaporating part of the heat pipe, and a heat transfer plate having an upward fitting recess is disposed in the condensing part of the heat pipe. arranged from below, each concave portion is closely fitted with a heat pipe, and the exposed portion above the condensing portion is made flat so as to intersect with the flat plate portion of the heat transfer plate;
A hot water storage tank having at least a bottom contact portion made of metal is disposed above the condensing portion.

This invention will be explained in detail below with reference to illustrated embodiments.

In each figure, 1 is a rectangular heat collecting plate made of aluminum, and a solar heat selective absorption film is formed on its surface.

This has a plurality of downward fitting recesses 2 having a semicircular cross section in the longitudinal direction.

3 is a plurality of heat pipes arranged under the heat collecting plate 1,
The evaporator 4 is tightly fitted into the downward recess 2 of the heat collecting plate 1.

Although one heat pipe 3 may be used in principle, a plurality of heat pipes are usually used.

Reference numeral 5 denotes a rectangular flat heat transfer plate made of aluminum, and has a plurality of upward fitting recesses 6 having a semicircular cross section in the width direction.

Normally, a selective absorption film is not formed on the heat exchanger plate 5.

The condensing part I of the heat pipe 3 is placed on the heat transfer plate 5 and is also tightly fitted into the upwardly directed recess 6.

Reference numeral 8 denotes the upper exposed portion of the condensing portion 7, which is flattened by pressing the upper surface side to prevent the tube from expanding during the tube expansion process, and serves as the flat plate portion 9 of the heat exchanger plate 6.

Reference numeral 10 denotes a rectangular parallelepiped box 1 made of synthetic resin and opening downward, which is a hot water storage tank disposed over the flat exposed portion 8 of the condensing portion 7 of the heat pipe 3 and the flat plate portion 9 of the heat transfer plate 6.
1 and a flat metal bottom plate 12 that closes the opening of the saucer, and the bottom plate 12 is provided so as to be in contact with the flat exposed part 8 of the condensing part 1 and the flat plate part 9 of the heat transfer plate 5.

The hot water storage tank 10 is usually assembled as follows.

First, the bottom plate 12 is placed over the exposed portion 8 of the condensing portion 1 and the flat plate portion 9 of the heat exchanger plate 5 and fixed by brazing or welding.

Next, the box body 11 is placed face down on the bottom plate 12 with its opening facing downward, and the flange portion 13 around the opening of the box body 11 is fixed to the bottom plate 12 with screws 14 via packing.

The synthetic resin box is generally non-toxic and strong, for example, an FRP box, and the metal bottom plate is preferably a stainless steel plate.

Note that, of course, the hot water tank may be entirely made of metal.

The solar water heater according to this invention is as described above, and since the heat pipe is arranged on the outer surface of the bottom wall of the hot water storage tank 10, there is no need to worry about sealing the heat pipe 3 and the hot water storage tank 10. Even if the heat pipe 3 ruptures, there is no risk of the working fluid leaking into the tank.

Further, in the condensing part 7 of the heat pipe 3, a heat transfer plate 5 having an upward concave part 6 is disposed from below, and the concave part 6 is connected to the condensing part I.
The exposed part 8 on the upper side of the condensing part 1 is made flat so that it intersects with the flat part 9 of the heat transfer plate 5. The contact surface with the hot water storage tank 10 can be greatly expanded, and the heat of the condensing section I can also be conducted to the hot water storage tank 10 via the heat transfer plate 5, making heat conduction extremely efficient. It can be done.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; Fig. 1 is a plan view of the solar water heater, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a cross-sectional view of the solar water heater. FIG. 4 is an enlarged sectional view taken along the line IV--IV in FIG. 2. FIG. 1... Heat collecting plate, 2... Downward recess for fitting, 3... Heat pipe, 4... Evaporation part, 5... Heat exchanger plate, 6... upward recessed part for fitting, 7... condensation part, 8... exposed part, 9... flat plate part, 10... ...Hot water tank.

Claims (1)

[Scope of utility model registration request] A heat collecting plate 1 having a downward fitting recess 2 is disposed from above in the evaporation part 4 of the heat pipe 3, and a heat transfer plate 5 having an upward fitting recess 6 is disposed in the condensing part 7 of the heat pipe 3. The concave portions 2.6 are arranged from below, and each concave portion 2.6 is closely fitted with the heat pipe 3, and the upper exposed portion 8 of the condensing portion I is flat-shaped so as to be flush with the flat plate portion 9 of the heat transfer plate 5. being done to,
A solar water heater in which a hot water tank 10 having at least a bottom contact part made of metal is disposed above a condensing part 7.