JPS623643Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a bath heating device equipped with a hot water supply and a waste heat recovery device.

Previously, JP-A-56-165855, JP-A-54-
As seen in Publication No. 33604, a bath heating device equipped with a hot water supply and a waste heat recovery device for the bathtub is known, but since these have a space for bath heating and a space for waste heat recovery in the hot water storage tank, the hot water storage tank is Inevitably, the capacity is large, and bath heating and hot water heating are performed at the same time.Moreover, the temperature of the waste heat recovery section is likely to rise, so bath heating (hot water heating) is slow and the effectiveness of waste heat recovery is not improved. .

This invention was made with the aim of eliminating such drawbacks, and has a structure in which bath heating, hot water supply heating, and waste heat recovery from the bathtub can be individually switched using a three-way valve to store hot water using a single heating source. The tank is compact because it only has the capacity to store the amount of water needed to supply hot water to the bathtub, and bath heating and hot water heating can be performed separately, so each heating is done efficiently. The purpose of the present invention is to provide a bath heating device equipped with a practically effective hot water supply and waste heat recovery device, in which the effectiveness of waste heat recovery from the bathtub is significantly enhanced because the tank is kept at a low temperature.

Examples thereof will be described below based on the drawings.

Figures 1 to 4 show an embodiment of the bath heating device according to this invention. A is a fin-and-tube heat exchanger heated by a heating source such as a gas burner 1, and for heating hot water. Reference numeral B designates a coil-type bath heating heat exchanger, which is installed in the bathtub 2 and connected to the fin-and-tube heat exchanger A through piping to form a bath heating circulation circuit D (see Fig. 2) as described later. ing. C is a coil-type hot water heating heat exchanger, which is installed in the hot water storage tank 3 and connected to the fin-and-tube heat exchanger A through piping to form a hot water heating circulation circuit E (see Figure 3) as described later. are doing. P is a pipe 5 to the fin-and-tube heat exchanger A, which is a common pipe for the bath heating circulation circuit D, the hot water supply heating circulation circuit E, and the waste heat recovery circulation circuit F described below.
Each circulation circuit D,
This is for forced circulation of the heat transfer liquid sealed in E and F. A bypass passage 7 spanning the circulation pump P is connected to the piping 4 to the bathtub 2 and the piping 5 to the fin-and-tube heat exchanger A, and through the bypass passage 7, a heat exchanger B for heating the bath and a piping 5 for heating the hot water are connected. The heat exchanger C is connected to form a bath waste heat recovery circulation circuit F (see FIG. 4) that recovers the residual heat of the bath water to the hot water storage tank 3. V ₁ , V ₂ and V ₃ are branch parts of piping 5 to the fin-and-tube heat exchanger A (piping 4 to the bathtub 2) and piping 6 to the hot water storage tank 3, and the fin-and-tube heat exchanger A three-way valve is provided at the branch point between the piping 5 to A and the bypass path 7, and by switching these three-way valves V ₁ , V ₂ , and V ₃ using appropriate means, the bath heating circulation circuit D The hot water supply heating circulation circuit E and the waste heat recovery circulation circuit F can be formed independently.

Therefore, when heating the bath, the three-way valves V ₁ , V ₂ , and V ₃ are switched to predetermined states and the bath heating circulation circuit D is activated.
When the fin-and-tube heat exchanger A is heated with a heating source such as a gas burner 1, the sealed heat medium liquid whose temperature has been raised in the heat exchanger A is passed through the bath heating circulation circuit D by the circulation pump P. Coil-type bath heating heat exchanger B in bathtub 2 for forced circulation
The bath water in the bathtub 2 is indirectly heated through the . Next, when heating hot water, the three-way valves V ₁ , V ₂ ,
When V ₃ is switched to a predetermined state to form the hot water heating circulation circuit E and the fin-and-tube heat exchanger A is heated with a heat source such as the gas burner 1, the heat exchanger A is heated and heated. Since the sealed heat medium liquid is forcibly circulated through the hot water heating circulation circuit E by the circulation pump P, the hot water stored in the hot water storage tank 3 is indirectly circulated through the coil type hot water heating heat exchanger C in the hot water storage tank 3. It heats it up. Furthermore, when recovering waste heat from the bath, the three-way valves V ₁ , V ₂ , and V ₃ are switched to predetermined states to form the waste heat recovery circulation circuit F for the bath. The sealed heat medium liquid heated and heated through the coil-type bath heating heat exchanger B passes through the waste heat recovery circulation circuit F and circulates through the pump P.
Since the water is forcibly circulated by the hot water storage tank 3, the hot water stored in the hot water storage tank 3 is indirectly heated via the coil type hot water heating heat exchanger C in the hot water storage tank 3. In addition,
In Fig. 1, 8 is a water supply pipe to the hot water tank 3, which automatically supplies water via a ball tap valve (not shown) installed in the hot water tank 3 to keep the water level in the hot water tank 3 constant. It is. Reference numeral 9 denotes a hot water outlet pipe from the hot water storage tank 3, with its end faucet 10 facing above the bathtub 2 so that the hot water stored in the hot water storage tank 3 can be easily introduced into the bathtub 2. Reference numeral 11 denotes a controller for controlling the hot water supply temperature in the hot water storage tank 3, which is connected to a hot water temperature sensor 12 in the hot water storage tank 3 and a gas control valve 14 provided in a gas pipe 13 to the gas burner 1. 15
is an exhaust pipe for releasing combustion exhaust gas from the gas burner 1.

Figures 5 to 8 show different embodiments of the bath heating device according to this invention, and Figure 5 is a coil type bath heating heat exchanger in the bathtub 2 in the previous embodiment (see Figure 1). The vessel B is abolished and the ends 4a and 4b of the piping 4 to the bathtub 2 are inserted into the bathtub 2. In this case, the bath is heated by direct circulation of the bath water by the fin-and-tube heat exchanger A. Since the waste heat recovery from the bath water also heats the stored water by direct circulation of the bath water, these can be performed more efficiently.

FIG. 6 shows that the coil-type hot water heating heat exchanger C in the hot water storage tank 3 in the previous embodiment (see FIG. 1) is abolished, and the ends 6a and 6b of the piping 6 to the hot water storage tank 3 are connected to the hot water storage tank 3. In this case, the hot water is heated by direct circulation of the stored hot water by the fin-and-tube heat exchanger A, and the waste heat of the bath water is recovered from the stored hot water by the bath heating heat exchanger B. Since heating is performed by direct circulation of water, these can be performed more efficiently.

FIG. 7 shows a case where a circulation pump P is installed in the piping 4 to the bathtub 2. In this case, the bypass passage 7 straddles the circulation pump P and is connected to the hot water storage tank 3 via three-way valves V ₃ and V ₄ . The piping 6 and the piping 4 to the bathtub 2 are connected to form a hot water heating circulation circuit E through a bypass passage 7.

FIG. 8 shows a case where a circulation pump P is installed in the piping 6 to the hot water storage tank 3, and a bypass passage 7 is connected to the piping ₄ to the bathtub 2 and the hot water storage tank 3 via a three-way valve V4, straddling the circulation pump P. A bath heating circulation circuit D is formed through a bypass path 7, and is connected to piping 6 to
With this structure, the same effects as in the previous embodiment (see FIG. 1) can be obtained. Here, the three-way valves V ₂ and V ₄ are not necessarily required, and the branch portion can simply be connected to piping. The above example shows the case where bath heating and hot water heating are performed separately, but the three-way valve
Bath heating and hot water heating can be performed simultaneously by using _{V 1 ,} V ₂ , V ₃ or V 1 , V ₂ , V ₃ , and V ₄ and switching these as appropriate.

As explained above, this idea has a structure in which bath heating, hot water heating, and waste heat recovery can be switched independently using three-way valves to perform direct or indirect heating, so each can be performed efficiently, and the hot water storage tank can be connected to the bathtub. After the hot water is supplied, the temperature becomes low, so the waste heat recovery effect is enhanced.
The bath can be heated quickly, and since the hot water storage tank can have approximately the same capacity as the amount of hot water in the bathtub, it has practical effects such as making the device more compact.

[Brief explanation of the drawing]

Fig. 1 is an overall schematic diagram showing one embodiment of this invention, Figs. 2 to 4 are schematic diagrams showing its different circulation circuits, and Figs. 5 to 8 are diagrams of different embodiments. FIG. 2 is a schematic configuration diagram showing only the main parts. A... Fin and tube heat exchanger, B...
...Coil type bath heating heat exchanger, C...Coil type hot water heating heat exchanger, D...Bath heating circulation circuit, E...Hot water heating circulation circuit, F...Waste heat recovery circulation circuit, P ...Circulation pump, 1...Gas burner,
2...bathtub, 3...hot water tank, 7...bypass path,
V ₁ , V ₂ , V ₃ , V ₄ ... three-way valve.

Claims (1)

[Scope of utility model registration request] Fin-and-tube heat exchanger A heated by the heating source of gas burner 1, bathtub 2, and hot water tank 3
A circulation pump P is interposed at an appropriate location of the piping 4, 5, and 6 connecting the fins and tubes, and a bypass passage 7 is connected across the circulation pump P to the piping 5 to the fin-and-tube heat exchanger A and hot water storage. A bath heating circulation circuit D and hot water supply heating circulation circuit E using a fin-and-tube heat exchanger A are connected to the piping 6 to the bath 3, and a bath water waste heat recovery circulation circuit F is connected to the bathtub 2 and the hot water storage tank 3. Three-way valves V ₁ , V ₂ , V ₃ are provided at the branch parts of each circulation circuit D, E, F, and each circulation circuit D,
A bath heating device equipped with a hot water supply and waste heat recovery device, characterized in that hot water or heat transfer liquid is forcedly circulated appropriately in E and F by a circulation pump P.