JPS6038552A - Hot water storage tank - Google Patents

Abstract

PURPOSE:To make the heat exchange over a wide range contacting with both top and under surfaces of a heat exchanger by a structure wherein the heat exchanger, which is formed in a sheet as a whole, is arranged at the lower portion in the interior of a tubular vessel along the inside surface of the vessel with a gap between the inside surface of the vessel and the under surface of the heat exchanger in a hot water storage tank consisting of the horizontal tubular vessel, in the interior of which the heat exchanger is equipped. CONSTITUTION:A sheet heat exchanger 4 with a circular arc section is seated in a horizontal hollow cylindrical vessel 3 along the inner peripheral surface of the vessel 3 with a small gap 9 between the inner peripheral surface of the vessel 3 and the under surface of the heat exchanger 4. During the operation, the heat transfer medium, which has collected the heat discharged from a solar heat collector (not shown), flows through one circular pipe 7 in the heat exchanger 4 and passes through passages 5... and then leaves the heat exchanger 4 through the other circular pipe 7'. At this time, the heat transfer medium flowing through the passages 5... heats the water in the vessel 3. The water is heated at both the tip surface and the under surface of the heat exchanger 4, resulting in developing the convection along both the surfaces of the heat exchanger 4 so as to circulate in the vessel 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a hot water storage tank that heats and stores water in the tank using a heat medium sent from a collector of a solar water heater.

[Background technology]

BACKGROUND ART Conventionally, as shown in FIG. 1, some hot water storage tanks have a tubular heat exchanger 2, such as a steel pipe, through which a heat medium flows, which is wound around the circumferential surface of a container 1 of the hot water tank many times. However, in this case, since there were only a few contact areas between the heat exchanger and the hot water storage tank body, the entire heat exchanger was not utilized, resulting in poor heat exchange efficiency. In addition, this required the length of the heat exchanger to be increased to increase the area of contact with the main body, which was a huge waste. Therefore, in order to increase the efficiency of heat exchange, a system was developed in which a tubular heat exchanger was installed in a spiral shape within the tank. However, since it did not intensively heat the area near the bottom of the tank where low-temperature water gathers, water circulation was insufficient and problems remained with heat exchange efficiency.

[Purpose of the invention]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a hot water storage tank that has extremely high heat exchange efficiency and does not require a heat exchanger to occupy a large space.

[Disclosure of the invention]

The inventors have completed this invention after extensive studies to achieve the above objectives.

This invention provides a hot water storage tank having a heat exchanger inside a horizontally placed cylindrical container, wherein the heat exchanger is plate-shaped as a whole,
The gist of the hot water storage tank is that it is arranged along the inner surface of the container with a distance between it and the inner surface of the container at the lower part of the container. Hereinafter, an embodiment thereof will be described in detail based on the accompanying drawings.

As shown in FIGS. 2 and 3, a plate-shaped heat exchanger 4 with an arc-shaped cross section is installed in a horizontally placed hollow cylindrical container 3 along the inner peripheral surface of the container. They are placed with a slight interval 9 between them. In the figure, reference numeral 6 denotes support parts that support this heat exchanger, and are provided at four locations in total near each corner of the heat exchanger.

In the heat exchanger 4, circular tubes 7 and 7' extend from the center line in the longitudinal direction toward both sides to the outside of the container 3, respectively.

Inside the container 3, four square tubular passages 5 are provided on both sides of the elongated window 8 bored between the circular tubes 7 and 7', and communicate with the circular tubes 7 and 7', respectively. There is. When used, such a heat exchanger 4 is connected to a solar heat collector (not shown).
The heat medium that has recovered the exhaust heat flows in from one circular tube 7, flows through the passage 5, and exits from the other circular tube 7'. At this time, the heat medium flowing inside the passage 5...
Warm the water inside. As shown in FIG. 3, the water is heated from both the upper and lower surfaces of the heat exchanger 4, and as shown by the arrows, convection occurs and circulates along both surfaces. In the figure, 10 is an injection pipe for injecting water into the container. Note that one circular tube 7' of the heat exchanger 4 passes through the injection tube 10. However, this is not particularly necessary, and the injection pipe may be provided at a position where the circular pipe does not penetrate.

In the embodiment, several passages were provided in the heat exchanger along the length of the container, but the number is not particularly limited.

In addition, as shown in FIG. 4, both molds 12 for blow molding
．． With 12' open, the cylindrical parison 11, which is the raw material for the container, is lowered to the heat exchanger 4 installed in advance between the molds. If blow molding is performed with the molds 12 and 12' closed, the heat exchanger will be built in at the same time as molding, so the time and effort required for manufacturing can be reduced. However, the method of forming the hot water tank is not limited to this.

〔Effect of the invention〕

As described above, the hot water storage tank according to the present invention is a hot water storage tank that includes a heat exchanger inside a horizontally placed cylindrical container, and the heat exchanger is plate-shaped as a whole, and the lower part of the container is connected to the inner surface of the container. The heat exchanger is characterized by being arranged along this inner surface with a space maintained between the heat exchangers, so that heat exchange can be performed over a wide area touching both the upper and lower surfaces of the heat exchanger. In addition, since heat exchange is concentrated at the bottom, the efficiency of heat exchange is extremely high due to the circulation of water by convection, and since the heat exchanger uses convection, it can achieve sufficient efficiency in the small space near the bottom. It also brings about the effect of demonstrating.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional hot water storage tank, Fig. 2 is a partially cutaway perspective view of an embodiment of the hot water storage tank according to the present invention, and Fig. 3 is a perspective view of the hot water storage tank of Fig. 2. A cross-sectional view showing the action,
FIG. 4 is a perspective view illustrating an example of the forming process of the hot water storage tank shown in FIG. 2. 3... Container 4... Heat exchanger 5... Passage 9.
... Distance between container and heat exchanger 12.12' ... Mold agent Patent attorney Takehiko Matsumoto 2 Figure 1 - Figure 3

Claims (1)

[Claims] (11) In a hot water storage tank having a heat exchanger inside a horizontally placed cylindrical container, the heat exchanger is plate-shaped as a whole, and there is a gap between the heat exchanger and the inner surface of the container at the bottom of the container. (2) A patent in which a plate-shaped heat exchanger is provided with a passage running in parallel from one end of the container to the other end. Claim 1
Hot water tank as described in section. (3) The hot water storage tank according to claim 1 or 2, wherein the heat exchanger is placed in a mold in advance and incorporated at the same time as the container is blow-molded.