JP2824054B2 - Hot water supply system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply system with improved tapping characteristics.

[0002]

2. Description of the Related Art In recent years, a fully automatic type of hot water heater having a hot water supply and a reheating function provided with a forced circulation means has been widely used.

In this fully automatic water heater, a hot water supply heat exchanger, a hot water supply path on the hot water outlet side of the hot water supply heat exchanger, and a flow path opening / closing valve interposed in a flow path branched from the hot water supply path are interposed. In some cases, an open-to-atmosphere type hopper is connected and a reheating circuit is connected to connect a forced circulation means and a reheating heat exchanger. The functions of such a fully automatic water heater include: a. Hot water supply to multiple places at the same time, b. At any time, hot water is poured into the bathtub, c. Setting the bath temperature, d. Heat retention for the bathtub, hot water, e. It has a function to fill the bath water.

[0004]

However, in such a hot water supply apparatus, for example, if hot water is supplied immediately after water is supplied by the operation of "filling", the operation of "filling" the hot water supply heat exchanger is performed. Since the cold water that has entered at the time of stagnation stays, the cold water is discharged without being sufficiently heated, and as shown in FIG. 6, there is a problem that the fluctuation of the hot water temperature temporarily becomes large. Was.

[0005] In particular, when cold water is passed through an unheated heat exchanger, there is a problem of dew condensation, which causes a problem of shortening the life of the heat exchanger.

Accordingly, an object of the present invention is to provide a hot water supply system in which hot water supply to a bathtub and water supply (cold water supply) can be selected, and the influence of water supply during hot water supply is reduced.

[0007]

SUMMARY OF THE INVENTION A hot water supply system according to the present invention is capable of selectively supplying cold water to the bathtub side without passing through a heat exchanger (2) when supplying cold water to the bathtub. It is.

[0008] The hot water supply system of the present invention has a water supply path (1).
A first heat exchanger (heat exchanger for hot water supply 2) for heating the hot water supplied from 4) and supplying hot water to the hot water supply path (3) side, and connected to the hot water supply path via a first open / close valve (4); A hopper (5) connected to the water supply path via a second on-off valve (9) to receive the water supply or hot water supply before heating and to separate the water supply side from the sewage side; A first pipe (16) connected to a hopper and receiving the water supply or the hot water supply and leading it to a bathtub;
A second heat exchanger connected to the first pipe via a pump (circulation pump 7) to heat the water on the bathtub side (heat exchanger for additional heating 8); and a second heat exchanger. A second pipe (18) for flowing hot and cold water heated by the exchanger into the bathtub.

With such a configuration, for example, when a procedure of “filling” is performed in a bathtub to supply water,
The first on-off valve is closed, and the path between the hot water outlet side and the hopper is shut off. On the other hand, when the second on-off valve is opened, the cold water by the water supply is supplied to the bathtub side from the first pipe via the path from the water supply path to the hopper without passing through the first heat exchanger. Therefore, even if tapping is performed immediately after performing the "filling" procedure, since cold water does not enter the hot water supply heat exchanger, the heat exchange action of the first heat exchanger rises earlier by that much, and dew condensation occurs. Without this, the temperature fluctuation of the tap water is suppressed, and stable hot water supply can be realized.

[0010] In the hot water supply system of the present invention, the water supply to the bathtub is performed by closing the first on-off valve and opening the second on-off valve.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments shown in the drawings.

1 to 3 show a first embodiment of a hot water supply system according to the present invention. The hot water heater 1 is provided with a hot water supply heat exchanger 2 as a first heat exchanger, and a first opening / closing valve 4 is interposed in a hot water supply path 3 to the outside on the hot water outlet side of the hot water supply heat exchanger 2. An open-to-atmosphere hopper 5 is connected to separate the sewage from clean water. The hot water supply heat exchanger 2 is connected to a clean water path 14 to be supplied with clean water.
A first pipe 16 is connected between the hopper 5 and the bathtub. A second pipe 18 is provided in the reheating circuit 6 for connecting to the bathtub side, and a reheating heat as a second heat exchanger is provided between the pipes 16 and 18 via a circulation pump 7. An exchanger 8 is connected, a branching path from the water introduction side of the heat exchanger 2 to the hopper 5 is formed, and a second on-off valve 9 is provided.

The controller 10 includes: a. Hot water supply to multiple locations simultaneously b. Pouring hot water at any time c. Setting of hot water temperature d. Perform procedures such as keeping warm, adding hot water, and e. Fill the bathtub f. Means for performing a procedure of injecting water into the washing machine. The on-off valve 4 is closed to shut off the flow path from the hot water outlet side of the hot water supply heat exchanger 2 to the hopper 5, and the on-off valve 9 is opened to open the on-off valve 9. Control for supplying water through a flow path from the water introduction side of the heat exchanger 2 to the hopper 5 is executed.

According to the water heater 1 having such a configuration, for example, when a procedure of "filling" is performed in a bathtub and water is injected, the first on-off valve 4 is closed,
The flow path from the hot water outlet to the hopper 5 is shut off. On the other hand, since the second on-off valve 9 is opened, the cold water does not pass through the hot water supply heat exchanger 2 but is supplied through the flow path from the water introduction side of the hot water supply heat exchanger 2 to the hopper 5. Is done. For this reason,
Even if hot water is supplied immediately after execution of the "filling" procedure, since cold water does not enter into the hot water supply heat exchanger 2, the heat exchange action of the hot water supply heat exchanger 2 rises quickly and time delay is suppressed. Therefore, the fluctuation of the temperature of the hot water to be discharged is suppressed.

FIGS. 2 and 3 show operation modes during hot water supply and water supply. FIG. 2 shows a hot water supply path, and FIG. 3 shows a water supply path (cold water supply) with thick lines.

FIG. 4 shows a second embodiment of the hot water supply system according to the present invention.
Is shown. Components substantially the same as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In this embodiment, the water heater 11 comprises a hot water supply heat exchanger 2 and a hot / water mixing means 12 (hereinafter referred to as a thermo mixing valve 12) at a hot water outlet side of the hot water supply heat exchanger 2.
The thermomixing valve 12 is connected to a water flow path branched and formed on the water introduction side of the hot water supply heat exchanger 2. In addition, this thermo mixing valve 12
The opening of the valve body is adjusted to mix water and hot water at a predetermined ratio, and a member that expands and contracts according to the temperature of the mixed hot and cold water is provided. By adjusting the opening degree of the valve body by acting the member to be adjusted, the mixing ratio of water and hot water is automatically corrected,
It has a function to supply hot water at the set hot water temperature.

In this water heater 11 as well, during execution of the "filling" procedure, the first on-off valve 4 is closed and the second on-off valve 9 is closed.
Is opened, the cold water reaches the hopper 5 from the water inlet side of the hot water supply heat exchanger 2 via the second on-off valve 9. further,
The cold water reaches the thermomixing valve 12 from the water introduction side of the hot water supply heat exchanger 2, is mixed with the hot water heated by the hot water supply heat exchanger 2, and can be discharged through the hot water supply path 3. Even during the “filling” procedure or the “water-filling” procedure to the washing machine, as shown in FIG. 5, hot and cold water can be obtained by the action of the thermo-mixing valve 12.

[0019]

As described above, according to the present invention,
Since cold water is not passed through the heat exchanger when supplying cold water to the bathtub, even if hot water is supplied immediately after the cold water is supplied, it is not affected by the cold water, preventing the occurrence of dew condensation and the heat generated by the hot water heat exchanger. The exchange action rises quickly,
Since the time delay is suppressed, fluctuations in the temperature of the tap water can be prevented, and stable tap water can be obtained.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a first embodiment of a hot water supply system of the present invention.

FIG. 2 is a diagram showing a hot water supply mode in the first embodiment.

FIG. 3 is a diagram showing a water supply (cold water) mode in the first embodiment.

FIG. 4 is a system diagram showing a second embodiment of the hot water supply system of the present invention.

FIG. 5 is a view showing tapping characteristics in the hot water supply system shown in FIG. 2;

FIG. 6 is a view showing a tapping characteristic of a conventional water heater.

[Explanation of symbols]

 1, 11 water heater 2 heat exchanger for hot water supply (first heat exchanger) 3 hot water supply path 4 first on-off valve 5 hopper 7 circulation pump (pump) 8 heat exchanger for reheating (second heat exchanger) 9) second on-off valve 14 water supply path 16 first pipe 18 second pipe

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F24H 1/46 F24D 17/00 F24H 1/00 606

Claims (2)

(57) [Claims] 1. A first heat exchanger for heating water supplied from a water supply path and supplying hot water to a hot water supply path side, wherein the first heat exchanger is connected to the hot water supply path via a first on-off valve, and the water supply path is connected to the first heat exchanger. A hopper connected via a second opening / closing valve to receive the water supply or hot water supply before heating and to separate a water supply side and a sewage side; and a tub connected to the hopper to receive the water supply or hot water supply And a second heat exchanger connected to the first pipe via a pump to heat the hot water on the bathtub side; and hot water heated by the second heat exchanger. And a second pipe that flows into the bathtub. 2. The hot water supply system according to claim 1, wherein the water is supplied to the bathtub by closing the first on-off valve and opening the second on-off valve.