JPH0227575B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a bathtub with a built-in heat exchanger.

A conventional bathtub 1' has a heat exchanger 2' attached to the outside as shown in FIGS. Since the bathtub water is boiled or reheated in step 5, heat is radiated to the outside from the heat exchanger case 6 as shown in Fig. Since the heat exchanger 1' cannot be cleaned, there is a problem that the heat exchange efficiency decreases due to scale etc. over time. Figures 4 and 5
The figure shows a heat exchanger 2'' attached to the inner wall of a bathtub 1'' and covered with a cover 3''.This eliminates wasted heat radiation to a large extent, but the bathtub space becomes narrower and the bathtub still retains water. The problem remained that the circulation was limited to the upper part.

The present invention has been developed in view of the above points, and its purpose is to circulate bath water to efficiently exchange heat and shorten boiling time.
Moreover, it is an object of the present invention to provide a bathtub with a built-in heat exchanger that does not narrow the bathtub space.

Thus, the present invention is a bathtub with a built-in heat exchanger, in which a planar heat exchanger 2 is disposed on the bottom surface of the bathtub 1, and the heat exchanger 2 is covered with a cover 3, in which the periphery of the cover 3 small protrusions 9 at predetermined intervals over approximately the entire length of the
A gap 12 for water flow in the bathtub is formed between the inner wall of the bathtub 1 and the periphery of the cover 3 via small protrusions 9, and this structure achieves the above object. .

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

Reference numeral 2 denotes a planar heat exchanger, which is fixed with a fixing fitting 7 slightly apart from the bottom surface of the bathtub 1.
Heating pipe connection port 8 to which the end of the heat exchanger 2 is connected
protrudes outward from the lower part of the side wall of the bathtub 1, and this heating pipe connection port 8 is connected to a heating circulation hot water pipe (not shown) of a hot water heater (not shown); Bathtub water is heated using circulating hot water for heating. Reference numeral 3 denotes a cover that covers the heat exchanger 2 and is made of FRP or the like. Small protrusions 9 are provided along the entire periphery of the cover 3, and legs 10 are suspended from the back surface of the cover 3. . A drainage port 11 is provided at one end of the cover 3. The cover 3 is disposed at the bottom of the bathtub 1 above the heat exchanger 2 and slightly spaced apart from the heat exchanger 2, and at this time, the legs 10 are grounded on the bottom of the bathtub 1. Furthermore, the small protrusions 9 of the cover 3 come into contact with the inner wall of the bathtub 1, and a gap 12 for bathtub water circulation is formed between the inner wall of the bathtub 1 and the periphery of the cover 3. The cover 3 will not shift and the gap 12 will not be closed. Further, the drain opening 11 of the cover 3 is located above the drain port 13 of the bathtub 1. The end of the heat exchanger 2 is connected to a bathtub fixture 15 via a detachable joint 14, and the heating pipe connection port 8 is connected to and fixed to the bathtub fixture 15.

By circulating hot water for heating, heat is exchanged at the bottom of the bathtub 1, and the gap 1 for water circulation in the bathtub 1 is heated.
Bathtub water is circulated from the bottom through 2. Figure 13 shows the bathtub water temperature vs. boiling time curve, and A
is a bathtub of the present invention, B is a bathtub with a heat exchanger attached to the inner wall, and C is a curve of a bathtub with a heat exchanger installed on the outside.From these curves, the present invention boils water from 10℃ to 43℃. It turns out that the boiling time can be reduced by about 40%. Furthermore, since heat exchange is performed within the bathtub 1, there is no wasteful heat radiation and thermal efficiency is good. Furthermore, the heat exchanger 2 can be cleaned by removing the cover 3 and then attaching and detaching the removable joint 14, thereby preventing the thermal efficiency of the heat exchanger 2 from decreasing due to scale or the like. FIG. 12 shows an example in which an appropriate number of small holes 16 are drilled in the cover 3 to further improve the circulation of bathtub water.

FIG. 10 shows another embodiment of the invention.
The arrows in the figure indicate the flow direction of hot water for heating in the heat exchanger 2, and the gap 12a near the side of the heat exchanger 2 into which high-temperature hot water for heating flows is made to lengthen the small protrusion 9a. The gap 12b near the side of the heat exchanger 2 from which the low-temperature heating water flows out is made smaller by shortening the small protrusion 9b. Therefore, the bath water can exchange heat more efficiently and have better circulation.

FIG. 12 shows still another embodiment of the present invention, in which the cover 3 is curved to facilitate the flow of heat-exchanged bath water.

As described above, the present invention is a bathtub with a built-in heat exchanger, in which a planar heat exchanger is disposed on the bottom of the bathtub, and this heat exchanger is covered with a cover, and the heat exchanger is disposed on the bottom of the bathtub, and the heat exchanger is covered with a cover. Small protrusions are provided at predetermined intervals, and a gap is formed between the inner wall of the bathtub and the periphery of the cover via the small protrusions for water flow in the bathtub, so that the bathtub water exchanges heat at the bottom of the bathtub. The bathtub water is circulated over almost the entire area inside the bathtub through the gap for water flow, enabling efficient heat exchange of the bathtub water, shortening the boiling time, and making the bathtub narrower due to the heat exchanger. The advantage is that there is no

[Brief explanation of drawings]

Fig. 1 is a front sectional view of the conventional example, Fig. 2 is a cutaway perspective view of the same heat exchanger, Fig. 3 is an explanatory diagram of the same operation, Fig. 4 is a front sectional view of another conventional example, and Fig. 5 is a front sectional view of the conventional example. The figure is a perspective view of the same heat exchanger, FIGS. 6a and 6b are a broken plan view and a front sectional view of the embodiment of the present invention, FIG. 7 is a plan view of the same cover, and FIG. 8 is the same cover. 9 is a front sectional view showing the installed state of the cover, FIG. 9 is an explanatory diagram of the same operation as above, FIGS. 10 a and b are a plan view and a side sectional view of another embodiment of the present invention, and FIG. FIG. 12 is a front sectional view showing still another embodiment of the present invention, and FIG. 13 is a comparison table of boiling times, where 1 is a bathtub, 2 is a heat exchanger, 3 is a boiling time comparison table, and FIG. 9 is a cover, 9 is a small projection, and 12 is a gap.

Claims (1)

[Claims] 1. A bathtub with a built-in heat exchanger, in which a planar heat exchanger is disposed on the bottom of the bathtub, and the heat exchanger is covered with a cover, and the heat exchanger is placed at a predetermined interval along approximately the entire length of the periphery of the cover. A bathtub with a built-in heat exchanger, characterized in that a small protrusion is provided in the bathtub, and a gap for bathtub water flow is formed between the inner wall of the bathtub and the periphery of the cover via the small protrusion.