JP2643684B2 - Fully automatic 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 system for automatically supplying hot water in a bathroom.

[0002]

2. Description of the Related Art In recent years, a hot water supply system has been developed and put into practical use in which, for example, hot water supply to a hot water supply facility installed in a kitchen or a bathroom in a general household and adjustment of a hot water supply temperature can be automatically performed by remote control using a remote controller. Has been provided.

Conventionally, in this type of hot water supply system, particularly in a hot water supply system for a bathtub body in a bathroom, for example, FIG.
Alternatively, there is a hot water supply / reheating unit a having a configuration as shown in FIG.

[0004] Such a hot water supply / reheating unit a supplies water from a tap water or the like to a hot water supply heat exchanger b and heats and raises the temperature. The heated and heated hot water is supplied to an automatic hot water supply solenoid valve. While the hot water is automatically supplied into the bathtub main body (not shown) by opening the valve c, the bathwater in the bathtub main body is circulated to the additional heating heat exchanger e connected to the additional heating circulation path d. By introducing and circulating the heat through the pump f, additional heating or heat retention is performed.

[0005]

However, in the above-mentioned conventional hot water supply system, when the automatic hot water supply electromagnetic valve c is opened at the time of automatic hot water supply, the hot water flows through the circulation path of the additional heat exchanger e. Since hot water is supplied by flowing backward in the return piping system, if the piping system in the circulation path is closed due to freezing or the like, the circulation pump f provided in the return piping system in the circulation path, pressure, etc. There is a problem in that direct pressure acts on sensors such as the sensor g and the water amount sensor h, and there is a fear that the sensors may be damaged.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fully automatic hot water supply system capable of reliably preventing damage caused by the action of direct pressure on a circulating pump and sensors at the initial stage of automatic hot water supply.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a hot water supply / reheating unit comprising a hot water supply heat exchanger and a reheating heat exchanger. The hot water supply side heat exchanger of the hot water supply unit is connected to the hot water supply side heat exchanger through the automatic hot water supply solenoid valve to the outgoing side piping system of the additional hot water circulation path of the hot water that is piped to the single circulation port of the bathtub body. On the other hand, the outgoing and return piping systems of the additional heat exchanger are connected to the outgoing and return piping systems of the circulation path, respectively, and a circulation pump is provided in the return piping system. A pressure sensor is installed on the upstream side of the circulating pump to make it possible to forcibly circulate the bath water in the bathtub body, and a three-way valve is provided downstream of the automatic hot water supply solenoid valve. An outlet is located between the reheating furnace and the return and return of the circulation path. As well as connected to a pipe system has a structure formed by providing a 2-way valve the one of the piping system to go side and the return side of the add 焚用 heat exchanger, when the automatic hot water supply initial,
The system is characterized in that hot water is supplied to the outgoing piping system side of a circulation path in which sensors such as the circulation pump and the pressure sensor are not provided, and a flow state of the hot water is detected to open and close the electromagnetic valve for automatic hot water supply. Is what you do.

[0008]

That is, the present invention provides an automatic hot water supply system at an early stage.
It has a piping configuration in which hot water is supplied to the outgoing piping system side of a circulation path in which sensors such as a circulation pump and a pressure sensor are not provided, and the flow rate state is detected to open and close the automatic hot water supply electromagnetic valve. Therefore, even if the piping system of the circulation path is closed due to freezing or the like, direct pressure does not act on the circulation pumps and sensors provided in the return-side piping system of the circulation path.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings shown in FIGS. 1 and 2. FIG. 1 schematically shows a piping system in an automatic hot water supply system according to the present invention. Reference numeral 1 in the figure denotes a hot water supply / reheating unit.

The hot water supply / reheating unit 1 includes a hot water supply heat exchanger 2 and a reheating heat exchanger 3, and each of the heat exchangers 2 and 3 is provided with one burner (not shown). )).

That is, in the hot water supply heat exchanger 2,
Water C · W from a water supply or the like is supplied via a water supply piping system 21, and the supplied water C · W is heated and heated to temporarily store hot water in a hot water tank 4. Hot water H / W can be supplied via the first hot water supply piping system 22.

The first hot water supply piping system 22 includes:
The second hot water supply piping system 23 branches, and the second hot water supply piping system 23 is connected to the single-port circulation port 101 of the bathtub body 100 via the automatic hot water supply electromagnetic valve 5 and the check valve 6. The hot water H / W from the hot water supply tank 4 is supplied into the bathtub body 100 by opening the automatic hot water supply electromagnetic valve 5 connected to the outgoing piping system 200A of the circulation circuit 200 for hot water.

On the other hand, the reheating heat exchanger 3 has an outgoing piping system 31 and a return piping system 32 which are connected to the outgoing piping system 200 A and the return piping system 20 of the reheating circulation circuit 200.
0B, and a circulation pump 7 is provided on the return-side piping system 32 side.
, The hot water W in the bathtub body 100 is forcibly circulated in the additional heat exchanger 3 to perform additional heating and heat retention.

Further, in the figure, reference numeral 8 denotes a three-way valve provided on the downstream side of the automatic hot water supply electromagnetic valve 5, and reference numeral 9 denotes a two-way valve provided on the inlet side of the return piping system 32 of the reheating heat exchanger 3. It is a valve.

The three-way valve 8 has its outlets A and B connected to the piping systems 31 and 32 on the outgoing and return sides of the circulation path with the additional heat exchanger 3 interposed therebetween. The inlet C is connected to a second hot water supply piping system 23 downstream of the automatic hot water supply electromagnetic valve 5, and at the beginning of the automatic hot water supply,
The outlet A is always connected to the outgoing piping system 31 of the circulation path.

Further, in the figure, 10 is a pressure sensor installed on the upstream side of the circulation pump 7, and 11 is this pressure sensor 1
Reference numerals 12, 13 and 14 denote thermistors for detecting the temperature of the hot water in each piping system, and reference numeral 15 denotes a flow sensor installed in the water supply piping system 21.

According to the configuration of the present invention, the outlet A of the three-way valve 8 is always connected to the outgoing piping system 31 of the circulation path at the beginning of the automatic hot water supply. In addition, hot water from the hot water supply heat exchanger 2 due to the opening of the automatic hot water supply electromagnetic valve 5 is supplied from the outgoing piping system 31 of the circulation path in which sensors such as the circulation pump 7 and the pressure sensor 10 are not provided. You.

Thus, the piping system 2 of the circulation path 200
Even if 00A and 200B are in a closed state due to freezing or the like, since direct pressure does not act on sensors such as the circulation pump 7 and the pressure sensor 10 provided in the return piping system 32 of the circulation path, Circulation pump 7 and pressure sensor 1
Sensors such as 0 are reliably prevented from being damaged.

At this time, the state of the flow rate is detected, and if there is no flow rate, the automatic hot water supply electromagnetic valve 5 is controlled to be closed as abnormal.

In the automatic hot water supply system according to the present invention, at the time of normal hot water supply, the circulation pump 7 is turned off, the solenoid valve 5 for automatic hot water supply and the two-way valve 9 are closed, and the outlet of the three-way valve 8 is connected to the outlet. Outlet A on the outgoing piping system 31 side of the circulation path
The hot water is supplied together with the burner combustion.

At the time of normal reheating, the circulating pump 7 is turned on, the solenoid valve 5 for automatic hot water supply is closed, and the two-way valve 9 is opened, and the outlet of the three-way valve 8 is connected to the forward side of the circulation path. At the outlet A on the piping system 31 side, the reheating of the bath water W is performed together with the combustion of the burner.

At the time of automatic hot water supply, as shown in the flowchart of FIG. 2, the circulation pump 7 is turned on, the automatic hot water supply electromagnetic valve 5 is closed, and the outlet of the three-way valve 8 is connected to the outgoing pipe of the circulation path. When the operation switch (SW) is turned on at the outlet A on the system 31 side, circulation is performed without burning the burner.

At this time, the state of the remaining hot water in the bathtub body 100 is detected, the electromagnetic valve 5 and the two-way valve for automatic hot water supply are closed, and if there is no remaining hot water, the flow switch 11 is kept OFF and the circulation pump is maintained. 7 is turned off, the automatic hot water supply electromagnetic valve 5 is opened, and the two-way valve 9 is closed, and the outlet of the three-way valve 8 is temporarily (for one minute) connected to the outlet B on the return piping system 32 side of the circulation path. ), The priming of the circulation pump 7 is automatically performed together with the combustion of the burner.

As described above, when the priming of the circulation pump 7 is completed, the hot water supply is temporarily stopped, the pressure at that time is measured by the pressure sensor 10, and the reference water level is rewritten and stored. To the piping system 3 on the outgoing side of the circulation path
The outlet is switched to the outlet A on the first side, the circulation pump 7 is turned off, the solenoid valve 5 for automatic hot water supply is opened, and hot water is supplied while the two-way valve 9 is closed, and the pressure during this hot water supply is measured.
When the pressure increases by a certain amount from the pressure value stored at the beginning of the automatic hot water supply, the hot water supply is stopped as the proper water level, the water level is set, and the filling is finished.

On the other hand, when there is residual hot water in the bathtub body 100, the flow switch 11 is turned on, the circulating pump 7 is turned off, the solenoid valve 5 for automatic hot water supply is opened, and the two-way valve 9 is closed. The outlet of the three-way valve 8 is connected to the piping system 3 on the outgoing side of the circulation path.
The hot water is supplied in the state of switching to the outlet A on the first side to fill the hot water, and the hot water supply is stopped as an appropriate water level when a certain amount increases from the pressure value stored at the time of the previous time and at the beginning of the automatic hot water supply. The setting is performed, and the filling is completed.

When the hot water filling is completed in this way, the normal reheating as described above is performed, and as a result, the bath water W
Is controlled to maintain a predetermined set temperature.

[0027]

As is apparent from the above description, the present invention is applicable to the initial heating of the automatic hot water supply on the outgoing piping system side of the reheating circulation path in which sensors such as a circulation pump and a pressure sensor are not provided. Hot water is supplied, the flow rate is detected and the solenoid valve for automatic hot water supply is opened and closed. Since direct pressure does not act on the circulation pumps and sensors provided in the return piping system, it is possible to reliably prevent the conventional circulation pumps and sensors from being damaged.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing an entire configuration of a fully automatic hot water supply system according to the present invention.

FIG. 2 is a flowchart showing a hot water supply / supplementary heating control state.

FIG. 3 is an explanatory view schematically showing a conventional hot water supply system.

FIG. 4 is an explanatory view schematically showing another example of a conventional hot water supply system.

[Explanation of symbols]

1 ... Hot water supply / reheating unit, 2 ... Heat exchanger for hot water supply, 3
... heat exchanger for additional heating, 5 ... solenoid valve for automatic hot water supply, 7 ...
Circulating pump, 8 ... three-way valve, 9 ... two-way valve, 10 ... pressure sensor, 11 ... flow switch, 21 ... water supply piping system, 22 ... first hot water supply piping system, 23 ... 2 hot water supply piping system, 31 ... piping system on the upstream side of the circulation path for additional heating, 32 ...
... Returning piping system of additional heating circulation path, 100... Bathtub body, 101... One-port circulation port, 200... Additional heating circulation path, 200 A.
0B: return-side piping system of the additional heating circulation path, A, B ... 3
Outlet of the direction valve, C · W …… Water, H · W …… Hot water, W …… Bath water.

Claims (1)

(57) [Claims] 1. A hot water supply / reheating unit comprising a heat exchanger for hot water supply and a heat exchanger for reheating is provided, and a hot water supply side piping system of the heat exchanger for hot water supply of the hot water supply / reheating unit is automatically provided. While connecting to the outgoing-side piping system of the reheating circuit of the hot-water bath, which is piped to the one-port circulation port of the bathtub via the hot-water supply electromagnetic valve, the outgoing and return-side piping system of the reheating heat exchanger Are connected respectively to the outgoing and return piping systems of the circulation path, and a circulating pump is provided in the return piping system, and a pressure sensor is installed on the upstream side of the circulating pump and the inside of the bathtub main body is installed. The hot water can be forcedly circulated, and a three-way valve is provided downstream of the automatic hot water supply electromagnetic valve.
Each of the outlets of the two-way valves is connected to the outgoing and return piping systems of the circulation path with the reheating heat exchanger interposed therebetween, and the outgoing and return sides of the reheating heat exchanger. Having a configuration in which a two-way valve is provided in one of the piping systems, and at the initial stage of automatic hot water supply, hot water is supplied to the outgoing piping system side of a circulation path in which sensors such as the circulation pump and the pressure sensor are not provided; A fully automatic hot water supply system characterized in that the flow rate state is detected to control the opening and closing of the automatic hot water supply electromagnetic valve.