JP2649284B2 - Hot water supply piping system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hot water supply piping system in a centralized hot water supply system used in a building or a general house.
In particular, it relates to a hot water supply piping system that can simplify the configuration of the piping.

(Prior art) Conventionally, in a high-rise building such as a residential building or a business building, for a high-rise building or a general house, hot water is supplied from a single boiler or heat exchanger to each dwelling unit or each hot water supply place of the dwelling unit. In many cases, a centralized hot water supply system is adopted, and a hot water supply piping system in the centralized hot water supply system 4 generally employs a double pipe type.

Hereinafter, the conventional double-pipe hot water supply piping system will be described with reference to FIG.

As shown in FIG. 2, a water heater 1 for supplying hot water (usually at 50 to 60 ° C.) is used to supply the hot water to each dwelling unit or hot water taps 3, 3,. A hot water supply pipe 5 is connected.

In the hot water supply pipe 5, if hot water is not consumed in each of the hot water taps 3, 3,..., The temperature of the hot water in the internal hot water drops due to heat radiation or the like. Are connected by a hot water return pipe 7 and low-temperature water inside the hot water supply pipe 5 when the hot water tap 3 is not used is circulated to the hot water supply unit 1 by a hot water supply circulation pump 9 interposed in the hot water return pipe 7 and again. The temperature is raised.

Further, a water supply pipe 11 from a water supply (not shown) is connected to the hot water return pipe 7 from the hot water supply circulating pump 9 at the farthest end of the hot water supply pipe 5 through a check valve 13. Tap water is supplied to the water heater 1 and low-temperature water is prevented from flowing into the water supply pipe 11 from the hot water return pipe 7.

(Problems to be Solved by the Invention) However, in the conventional double tube hot water supply piping system shown in FIG. 2, when hot water is not consumed in each hot water tap 3, 3,. In order to keep the temperature of the hot water in the inside always higher than a predetermined temperature, the hot water supply circulation pump 9 must be constantly operated during that time.

For this reason, it is necessary to increase the diameter of the hot water supply return pipe 7, which increases the construction cost due to the large piping configuration, and also requires the capacity of the hot water circulation pump 9 to be increased, and the running cost also increases. However, it is necessary to provide the hot water return pipe 7 and the hot water circulation pump 9 for each hot water supply system, and there is a problem that maintenance becomes complicated particularly in a large-scale building or the like.

Further, if the number of the hot water supply systems is large and the number of the hot water return pipes 7 is large or long, these hot water return pipes 7
May cause a short circuit, the circulation of low-temperature water from the end of the hot water supply pipe 5 far from the water heater 1 may be hindered, and the heat retaining effect may not be obtained. However, there is a problem that a desired hot water temperature may not be obtained immediately when is opened.

The present invention has been made in view of the above circumstances, and can reduce the construction cost and the running cost and improve the maintainability by simplifying a piping configuration thereof, and furthermore, a hot water tap located away from a water heater. In this case, the desired hot water can always be obtained immediately. It is intended to provide a hot water supply piping system.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a water supply pipe laid beforehand in a building, and a water heater that heats water supplied from the water supply pipe to generate hot water. A hot water supply pipe system comprising: a plurality of hot water taps provided at each hot water supply location in the building; and a hot water supply pipe for feeding hot water generated by the hot water supply device to each hot water tap. A downstream end of the pipe is directly connected to a nearest water supply pipe laid in advance in the building, and a temperature sensor for detecting a temperature of hot water in the hot water supply pipe is provided near a downstream end of the hot water supply pipe. Then, at the downstream end of the class length pipe, the hot water in the hot water supply pipe detected by the temperature sensor is activated when the temperature of the hot water falls below a predetermined temperature to force the hot water in the hot water supply pipe to the nearest water supply pipe. With a hot water pump that discharges water .

Further, the present invention is configured such that the temperature sensor is disposed near a downstream side of an endmost hot water tap connected to the hot water supply pipe, and detects a temperature of hot water in a hot water supply pipe near a downstream side of the hot water tap. Things.

Further, in the present invention, a check valve for preventing inflow of water from the nearest water supply pipe to the hot water supply pipe is provided in a hot water supply pipe downstream of the return hot water pump directly connected to the nearest water supply pipe. It is.

(Operation) In the present invention having the above configuration, when the temperature sensor detects that the temperature of the hot water in the hot water supply pipe falls below a predetermined temperature, the return hot water pump operates and discharges the hot water in the hot water supply pipe to the water supply pipe. In addition, there is no need to provide a pipe or the like for constantly circulating hot water in the hot water supply pipe. Therefore, it is possible to simplify the piping configuration, reduce construction costs and running costs, and improve maintainability.

Further, hot water having a temperature lower than the desired hot water temperature is forcibly discharged to a water supply pipe by a hot water pump, and new hot water is immediately supplied to the hot water supply pipe from the water heater, so that the hot water is located away from the water heater. Hot water with a desired hot water temperature can always be obtained immediately from the hot water tap.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory view showing a schematic configuration of a hot water supply piping system according to one embodiment of the present invention. In FIG. 1, the same elements as those shown in FIG. Is attached.

Then, in the hot water supply piping system of the present embodiment, hot water (normally 50 to 60 ° C.) is supplied. For example, a water heater 1 such as a boiler or a heat exchanger is connected to a hot water supply pipe 5 for sending hot water to each dwelling unit or hot water taps 3, 3,... Provided in the dwelling units. A water supply pipe 11 from a water supply (not shown) is connected to the vessel 1. The water supply pipe 11 is not limited to a water supply pipe to the water heater 1, and there are a plurality of water supply pipes for a cold water faucet juxtaposed with the hot water tap 3, and these water supply pipes are provided in a wall or a floor of a building. Has been laid.

The most distal end of the hot water supply pipe 5 is connected to the nearest water supply pipe 11, and the hot water supply tap 3,
Among the three,..., The hot water supply pipe 5 near the hot water tap 3 at the position farthest from the water heater 1 is provided with a temperature sensor 15 for detecting the hot water temperature at that position.

Further, in the hot water supply pipe 5 between the temperature sensor 15 and the terminal end connected to the water supply pipe 11, the temperature detected by the temperature sensor 15 is lower than a predetermined temperature (40 ° C. in this embodiment). A return hot water pump 17 is provided which is activated when the detected temperature falls below a predetermined temperature and stops the operation when the detected temperature once again exceeds the predetermined temperature.

The hot water pump 17 discharges the low-temperature water from the water supply pipe 11 when the temperature of the hot water in the water supply pipe 5 near the position where the temperature sensor 15 is disposed falls below the predetermined temperature.
The hot water supply pipe 5 between the hot water pump 17 and the water supply pipe 11 includes:
A check valve 19 for preventing tap water from flowing from the water supply pipe 11 to the hot water supply pipe 5 is provided.

Next, the operation of the hot water supply piping system according to the present embodiment having the above configuration will be described.

Tap water supplied from a water supply system via a water supply pipe 11 is heated by a water heater 1, and the hot water is sent to each hot water tap 3 via a hot water supply pipe 5. On the other hand, in each of the hot water taps 3, 3,...
Is supplied.

By the way, while the hot water taps 3, 3,... Are not opened, the remaining hot water finally sent to any one of the hot water taps 3 is in a state of being accumulated. Immediately after the opened hot-water tap 3 is closed, the hot water temperature in the hot-water supply pipe 5 is approximately 50 to 60 ° C.

If the time elapses after the hot water taps 3, 3,... Are not opened, the temperature of the hot water stored in the hot water pipe 5 decreases due to heat radiation due to heat radiation of the hot water pipe 5, and the hot water temperature decreases. But
When the temperature falls below 40 ° C., the temperature is detected by the temperature sensor 15, and accordingly, the return water pump 17 is operated, and the low-temperature water in the hot water supply pipe 5 is discharged to the water supply pipe 11.

At the same time, new hot water is supplied from the water heater 1 to the hot water supply pipe 5, so that the temperature of the hot water in the hot water supply pipe 5 near the temperature sensor 15 gradually rises above 40 ° C. When detected by 15, the return pump 17 stops its operation.

Thereafter, the above operation is repeated until one of the water taps 3 is opened, whereby the hot water temperature in the hot water supply pipe 5 is maintained at 50 to 60 ° C.

Note that the temperature of the low-temperature water discharged to the water supply pipe 11 is at least 40 ° C. or less and the amount thereof is smaller than that of tap water in the water supply pipe 11. When mixed with water, the temperature of the hot water drops, and the water supply pipe 11 is not damaged.

As described above, the hot water supply pipe system of the present embodiment uses the hot water in the hot water supply pipe 5 whose hot water temperature has decreased due to heat radiation or the like to the water supply pipe 11.
Since there is no need to provide a hot water supply return pipe as in the prior art, it is possible to simplify the piping configuration, thereby reducing construction costs and improving maintainability.

Also, the hot water supply pipe 5 is connected at its extreme end to the nearest water supply pipe 11, and when the temperature of the hot water inside the water supply pipe 5 falls below 40 ° C., the return water pump 17 discharges the low-temperature water to the nearest water supply pipe 11. Therefore, the conventional short circuit of the hot water supply pipe 5 system does not occur, so that hot water at a desired hot water temperature can always be immediately obtained even at a hot water tap located away from the water heater.

Further, since the return water pump 17 is merely for discharging the low-temperature water inside the hot water supply pipe 5 to the nearest water supply pipe 11,
The running cost can be reduced without having to increase the capacity.

(Effect of the Invention) As described above, according to the present invention, the downstream end of the hot water supply pipe is directly connected to the nearest water supply pipe laid in advance in the building, and near the downstream end of the hot water supply pipe, A temperature sensor for detecting the temperature of the hot water in the hot water supply pipe is provided, and is activated at a downstream end of the hot water supply pipe when the temperature of the hot water in the hot water pipe detected by the temperature sensor falls below a predetermined temperature. A hot water pump that forcibly discharges hot water in the hot water supply pipe to the nearest water supply pipe is provided, so that pipes for constant circulation are not required, and pipes for hot water circulation are newly added. Since there is no need to lay it, the piping configuration is simplified, so that the construction cost and running cost can be reduced and the maintainability can be improved.

In addition, the hot water in the hot water supply pipe having a temperature lower than the predetermined temperature is not returned to the water heater, but is forcibly discharged to the nearest water supply pipe laid in advance in the building by the hot water pump, whereby In this case, new hot water is immediately supplied from the water heater, so that hot water at the hot water temperature can be immediately obtained even at a hot water tap located away from the water heater.

In addition, a check valve that prevents water from flowing from the nearest water supply pipe to the hot water supply pipe is provided in the hot water supply pipe downstream of the return water pump that is directly connected to the nearest water supply pipe, thereby supplying water to the hot water supply pipe. The water in the pipe can be prevented from flowing.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of a hot water supply piping system according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing a schematic configuration of a conventional double-pipe hot water supply piping system. In the drawing, reference numeral 1 denotes a water heater, 3 denotes a hot water tap, 5 denotes a hot water supply pipe, 11 denotes a water supply pipe, 15 denotes a temperature sensor, 17 denotes a return hot water pump, and 19 denotes a check valve.

Claims (3)

(57) [Claims] 1. A water supply pipe laid in advance in a building, a water heater for heating water supplied from the water supply pipe to generate hot water, and a water heater provided at each hot water supply location in the building. In a hot water supply piping system comprising: a plurality of hot water taps, and a hot water supply pipe for supplying hot water generated by the hot water supply device to each of the hot water taps, a downstream end of the hot water supply pipe is laid in advance in the building. A temperature sensor for detecting the temperature of hot water in the hot water supply pipe is disposed near the downstream end of the hot water supply pipe, and the temperature sensor is provided at the downstream end of the hot water supply pipe near the downstream end of the hot water supply pipe. A hot water pump is provided which starts when the temperature of the hot water in the hot water supply pipe detected by the sensor falls below a predetermined temperature and forcibly discharges the hot water in the hot water supply pipe to the nearest water supply pipe. Hot water supply piping system. 2. The temperature sensor according to claim 1, wherein said temperature sensor is disposed near a downstream side of a hot water supply tap connected to said hot water supply pipe and detects a temperature of hot water in the hot water supply pipe near a downstream side of said hot water supply tap. The hot water supply piping system according to claim 1. 3. A check valve for preventing water from flowing into the hot water supply pipe from the nearest hot water supply pipe is provided at a hot water supply pipe downstream of the return hot water pump directly connected to the nearest hot water supply pipe. The hot water supply piping system according to claim 1, wherein: