JPH04151435A - Hot water supplying tube system - Google Patents

Abstract

PURPOSE:To simplify a piping configuration and to improve maintainability by providing a temperature sensor for sensing temperature of hot water, and a hot water return pump for operating when the temperature of the hot water drops lower than a predetermined temperature to discharge the hot water in a hot water supply tube to a water supply tube. CONSTITUTION:The end of a hot water supply tube 5 is connected to a water supply tube 11, a temperature sensor 15 for sensing temperature of hot water in the tube 5 is arranged near the end of the tube 5, and a return hot water pump 17 for operating when the temperature of the hot water in the tube 5 sensed by the sensor 15 drops lower than a predetermined temperature to discharge the hot water in the tube 5 to the tube 11 is arranged at a connecting position to the tube 11 at the end of the tube 5. Accordingly, when the sensor 15 senses that the temperature of the hot water in the tube 5 drops lower than the predetermined temperature, the pump 17 is operated to discharge the hot water in the tube 5 to the tube 11, and hence, it is not necessary to arrange a pipe, etc., for circulating the hot water in the tube 11. Thus, a piping configuration can be simplified, and maintainability can be improved.

Description

[Detailed Description of the Invention] (Field of Industrial Application) 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, and in particular, it is possible to simplify the configuration of the piping. Regarding the hot water supply piping system that can be used.

(Prior technology) Traditionally, in multi-family housing, general houses, residential buildings, business buildings, and other high-rise buildings, hot water has been supplied from a single boiler or heat exchanger to each residential unit or each hot water supply point of that unit. There are many cases where a centralized hot water supply system is adopted, and the hot water piping system in such a centralized hot water supply system is generally called a double pipe type.

Below, we will explain the second part of the above conventional double-pipe hot water supply piping system.
This will be explained with reference to the figures.

As shown in Fig. 2, a water heater 1 that supplies hot water (usually at 50 to 60°C) has a hot water supply unit that sends the hot water to each dwelling unit or to hot water taps 3 and 3° installed in that unit. A pipe 5 is connected.

In this hot water supply pipe 5, if hot water is not consumed at each hot water tap 3, 3°, the temperature of the internal hot water will drop due to heat radiation, etc. A hot water return pipe 7 connects between the two, and a hot water circulation pump 9 interposed in the hot water return pipe 7 circulates the low-temperature water inside the hot water pipe 5 when the hot water tap 3 is not in use to the water heater 1 to raise the temperature again. I'm trying to keep it warm.

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

(Problem to be solved by the invention) However, in the conventional double-pipe hot water piping system shown in FIG. 2 above, when hot water is not being consumed at each hot water tap 3, 3°... In order to maintain the temperature of the hot water in the hot water supply pipe 5 at a predetermined temperature or higher at all times, the hot water circulation pump 9 must be operated at all times.3 Therefore, it is necessary to increase the diameter of the hot water return pipe 7. This results in a large-scale piping configuration and high construction costs, and the need to increase the capacity of the hot water circulation pump 9, resulting in high running costs.
In addition, the hot water return pipe 7 and the hot water circulation pump 9 must be provided for each hot water supply system, which poses a problem in that maintenance becomes complicated, especially in large buildings.

Furthermore, if there are many hot water supply systems mentioned above and the number of hot water return pipes 7 increases or becomes long, these hot water return pipes 7 may cause a short circuit, and the hot water supply pipes 5 located far from the water heater l may Circulation of low-temperature water from the farthest end may be inhibited and a heat retention effect may not be obtained (therefore, when the hot water tap 3 at the farthest end is opened, the desired hot water temperature may not be obtained immediately). There was a problem.

The present invention has been made in view of the above circumstances, and it is possible to simplify the piping configuration, reduce construction costs and running costs, and improve maintainability. It is an object of the present invention to provide a hot water supply piping system that can immediately obtain hot water at a desired temperature at all times.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a water supply pipe, a water heater that generates hot water by heating water from the water supply pipe, and a water supply device installed at a hot water supply location in a building. In a hot water piping system comprising a hot water tap and a hot water pipe that sends hot water generated by the water heater to the hot water tap, an end of the hot water pipe is connected to the water pipe, and near the end of the hot water pipe, A temperature sensor that detects the temperature of the hot water in the hot water supply pipe is disposed, and the temperature of the hot water in the hot water supply pipe detected by the temperature sensor is set at a connection position to the water supply pipe at the end of the hot water supply pipe. The system is equipped with a hot water return pump that operates when the temperature drops below the water supply pipe and discharges the hot water in the water supply pipe to the water supply pipe.

Further, in the present invention, the temperature sensor is disposed near the most distal faucet connected to the hot water supply pipe.

Further, in the present invention, a check valve for preventing water from flowing from the water supply pipe into the hot water supply pipe is disposed at the end of the hot water supply pipe on the water supply pipe side from the hot water return pump.

(Function) 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 has fallen below a predetermined 1 degree, the hot water return pump is activated and discharges the hot water in the hot water supply pipe to the water supply pipe. There is no need to provide pipes or the like to constantly circulate hot water in the water supply pipes, so the piping configuration can be simplified, reducing construction costs and running costs, and improving maintainability.

In addition, hot water that has dropped below the desired water temperature is forcibly discharged to the water supply pipe by the hot water return pump, and new hot water is immediately supplied to the water supply pipe from the water heater, so it is necessary to place the hot water at a location far away from the water heater. Hot water at the desired temperature can always be obtained immediately from a hot water tap.

(Example) Embodiments of the present invention will be described below based on 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. Elements in FIG. 1 that are the same as those shown in FIG. It is attached.

In the hot water piping system of this embodiment, the hot water is supplied to the water heater 1, such as a boiler or heat exchanger, which supplies hot water (usually at 50 to 60°C) to the hot water supply system installed in each dwelling unit. A hot water supply pipe 5 for supplying water is connected to the taps 3, 3°, etc., and a water supply pipe 11 from a water supply (not shown) is further connected to the water heater I.

The end of this hot water supply pipe 5 is connected to the nearest water supply pipe 11, and a hot water tap 3 provided on the hot water supply pipe 5 is connected to the nearest water supply pipe 11.
,3. A temperature sensor 15 for detecting the temperature of hot water at that position is disposed in the hot water pipe 5 near the hot water faucet 3 located farthest from the water heater 1.

Furthermore, the temperature detected by the temperature sensor 15 in the hot water supply pipe 5 between the temperature sensor 15 and the end connected to the water supply pipe 11 is below a predetermined temperature (40° C. in this embodiment). A hot water return pump 17 is provided which operates when the temperature exceeds the predetermined temperature and stops its operation when the detected temperature, which has once fallen below a predetermined temperature, exceeds the predetermined temperature again.

This return hot water pump 17 is for discharging the low-temperature water to the water supply pipe 11 when the hot water in the hot water supply pipe 5 near the location where the temperature sensor 15 is installed falls below the predetermined temperature. The hot water supply pipe 5 between the return hot water pump 17 and the water supply pipe 11 is provided with a check valve 19 for preventing tap water from flowing into the hot water supply pipe 5 from the water supply pipe 11 .

Next, the operation of the hot water supply piping system of this embodiment with the above configuration will be explained.

Tap water supplied from the water supply via the water supply pipe 11 is heated in the water heater 1, and this hot water is passed through the hot water supply pipe 5 to each hot water tap 3, 3. Water is sent to...

Each hot water tap 3, 3. ..., hot water heated by the water heater 1 is supplied by opening the tap at a desired time.

By the way, each of the hot water taps 3, 3. ..., while the hot water tap 3 is not opened, the remaining hot water that was last sent to one of the hot water taps 3 accumulates, and the hot water tap 3 that was opened last is Immediately after the tap is closed, at 7φ, the temperature of the hot water in the hot water pipe 5 is about 50 to 60°C.

Then, from now on, hot water tap 3, 3. If time passes without opening the taps, the temperature of the hot water accumulated in the hot water pipe 5 will decrease due to heat radiation from the hot water pipe 5, and if the local temperature falls below 40°C, this will cause the above-mentioned temperature to drop. The temperature is detected by the temperature sensor 15, and accordingly, the hot water return pump 17 is activated, and the low temperature water in the hot water supply pipe 5 is discharged to the water supply pipe 1.

In parallel with this, new hot water is sent from the water heater 1 to the hot water pipe 5, so the fA temperature in the hot water pipe 5 near the temperature sensor 15 gradually rises to exceed 40°C.
When this is detected by the temperature sensor 15, the return hot water pump [7] stops its operation.

Thereafter, the above operation is repeated until any of the water taps 3 is opened, and as a result, the temperature of the hot water in the hot water supply pipe 5 is maintained at 50 to 60''C.

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

As described above, the hot water piping system of this embodiment transfers hot water in the hot water pipe 5, whose temperature has decreased due to heat radiation, to the water supply pipe 11.
Since the hot water is discharged to the hot water, there is no need to provide a hot water return pipe as in the conventional case, and the piping configuration can therefore be simplified to reduce construction costs and improve maintainability.

Further, the most end of the hot water supply pipe 5 is connected to the nearest water supply pipe 11, and when the temperature of hot water inside the hot water supply pipe 5 falls below 40°C, the return hot water pump 17 transfers the low temperature water to the nearest water supply pipe 11.
Since the hot water is discharged to the hot water supply system, a short circuit of the hot water pipe 5 system as in the conventional case does not occur, and hot water at the desired 4 temperatures can always be immediately obtained even at a hot water faucet located away from the water heater.

Furthermore, since the return hot water pump 17 is simply for discharging the low-temperature water inside the hot water supply pipe 5 to the nearest water supply pipe 11, there is no need to increase the capacity, and running costs can be reduced.

(Effects of the Invention) As explained above, according to the present invention, the temperature of hot water in the hot water supply pipe is monitored by a temperature sensor, and the hot water in the hot water supply pipe is kept at a predetermined level due to heat radiation generated when the hot water tap is not opened. Since the low-temperature water is discharged into the water supply pipe when the temperature drops below , the piping configuration can be simplified, reducing construction costs and running costs, and improving maintainability. To provide hot water at a desired temperature at all times, even at a hot water tap located far away.

[Brief explanation of the drawing]

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 figure, 1 is a water heater, 3 is a hot water tap, 5 is a hot water pipe, 11 is a water supply pipe, 15 is a temperature sensor, ] 7 is a return pump, 19
is a check valve.

Claims (3)

[Claims] (1) A water supply pipe, a water heater that generates hot water by heating water from the water supply pipe, a hot water tap installed at a hot water supply location in the building, and a hot water tap that supplies the hot water generated by the water heater to the hot water tap. A hot water supply piping system comprising: a hot water supply pipe that supplies water to a hot water supply pipe; and a temperature sensor that connects an end of the hot water supply pipe to a water supply pipe, and that detects the temperature of hot water in the hot water supply pipe near the end of the hot water supply pipe. At the same time, when the temperature of the hot water in the hot water supply pipe detected by the temperature sensor at the end of the hot water supply pipe is connected to the water supply pipe is lower than a predetermined temperature, the temperature sensor operates to supply the hot water in the hot water supply pipe to the water supply pipe. A hot water piping system characterized by being equipped with a return pump that discharges hot water into the water supply pipe. (2) Claim 1 characterized in that the temperature sensor is disposed near a water faucet at the far end connected to the hot water supply pipe.
Hot water piping system as described. (3) A check valve for preventing water from flowing from the water supply pipe into the hot water supply pipe is disposed at a portion of the end of the hot water supply pipe that is closer to the water supply pipe than the return hot water pump. hot water piping system.