JPS60196523A - Circulating hot water feeding device - Google Patents

Abstract

PURPOSE:To reduce the radiation loss during the circulation of hot water to save piping material by constituting the piping so that the pipe sectional area of a supply hot water return pipe is made smaller than that of a supply hot water feed pipe. CONSTITUTION:The supply hot water return pipe 19 of circulating hot water feed device is so constituted that the pipe sectional area of a supply hot water return pipe 19 is made smaller than that of a supply hot water feed pipe 13. The supply hot water return pipe 19 is integrally coated with a heat insulating material and connected to a supply hot water heat source 12. According to this constitution, during the circulating operation, the quantity of radiation from the supply hot water return pipe 19 is reduced. A temperature detector 21 for detecting the temperature within the pipeline is provided in the supply hot water feed pipe 13. When the temperature within the supply hot water feed pipe 13 is lower than a preset temperature, a circulating pump 20 is started, and hot water within the supply hot water heat source 12 is fed to the pipeline. When hot water reaches a predetermined temperature, the operation of the circulating pump 20 is stopped to prevent wasteful radiation from the pipeline and to reduce the power consumption of the circulating pump 20.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a circulating hot water supply device that circulates hot water to achieve instantaneous hot water supply.

Conventional Example (Structure and Problems Thereof) Conventionally, there has been a circulating hot water supply device of this type as shown in FIG.

In FIG. 1, reference numeral 1 denotes a water supply system, and water is supplied to the hot water supply heat source device 2 via a water supply pipe 3. The hot water produced by the hot water heat source device 2 is transferred from the hot water supply pipe 4 to the hot water supply return pipe 5.
Circulation is performed by the circulation pump 6 to the water supply pipe 7 and the water supply pipe 3.
After that, it returns to the hot water supply unit 2 again. A hot water mixing valve 8 mixes the hot water from the hot water heat source device 2, the hot water from the high return pipe 5, and the water coming through the water supply pipe 7. Mixed hot water is supplied from a hot water tap 9.10 via a hot water supply pipe 4. Reference numeral 11 denotes a flow switch, which determines whether the hot water tap 9.1o is open or closed as a flow rate value.

In terms of operation, when hot water tap 9.1o is closed,
The flow switch 11 detects that the flow rate is low and reduces the capacity of the circulation pump 6 to perform low pressure circulation. ' When the hot water taps 9 and 10 are opened, the flow valve 11 detects that the flow rate is large and causes the circulation pump 6 to pressurize and circulate. The remaining hot water supplied by the hot water tap 9.10 is returned through the hot water return pipe 5.

The problem with this conventional circulating hot water supply system was its drawback. .

(1) Heat dissipation caused by circulation, especially from the hot water supply return pipe 5, was wasteful and was contrary to energy conservation.

2) Even if the circulation pump 6 circulates at low pressure when the hot water tap 9.10 is not in use, the amount of heat dissipated from the hot water supply pipe 4 and the hot water return pipe 5 is determined by the thermal resistance of the insulation H and the temperature difference between the inside and outside of the pipe. It was not something that could be reduced because it was influenced by

OBJECTS OF THE INVENTION The present invention solves these conventional problems, and aims to provide a circulating hot water supply system that reduces heat radiation loss from piping.

Structure of the Invention In order to achieve this object, the present invention provides a hot water supply heat source machine, a hot water supply pipe connected to the hot water supply heat source machine, a hot water supply return pipe configured with a pipe cross-sectional area smaller than that of the hot water supply pipe, and a system for supplying and stopping hot water. A circulating hot water supply system consists of a hot water tap, a circulation pump that circulates hot water, and a controller that controls the operation of this circulation pump.
7, the heat radiation loss mainly from the hot water supply return pipe is reduced without using any particularly complicated equipment.

DESCRIPTION OF EMBODIMENTS Next, embodiments of the present invention will be described with reference to FIGS. 2 and 3.

In FIG. 2, a hot water supply pipe 13 is connected to the hot water supply heat source device 12, and a water supply pipe 13 is connected to the water supply heat source device 12.
It is mixed with water sent from a water supply pipe 16 branched from 5 and supplied to a hot water tap 17.1 at the terminal.

The hot water supply return pipe 19 is open and has a smaller pipe cross-sectional area than the hot water supply pipe 13, and as shown in the enlarged cross-sectional view, it is provided as a double unit with the hot water supply pipe 13 and heat-insulatingly coated, and the hot water supply heat source equipment 1
Connected to 2. A circulation pump 2 is installed in the hot water return pipe 19.
0 is connected, and the hot water supply return pipe 1 is connected from the hot water supply pipe 13 to the hot water supply return pipe 1.
Hot water is circulated to 9. The hot water supply pipe 13 is provided with a temperature detector 21 that detects the temperature in the pipe, and a signal from the temperature detector 21 is amplified by an amplifier 22 to start and stop the circulation pump 20. That is, the temperature detector 21 and the amplifier 22 constitute a controller that controls the circulation pump 20. The temperature detector 21 may be installed in the hot water supply return pipe 19, and in either case, the temperature in the pipe is When you get down, circulation pump 20
When the temperature rises, a signal is obtained to stop the circulation pump 20.5.The hot water mixing valve 14 drives the valve 24 with the motor 23 as shown in Fig. 3, and detects the temperature of the mixed water. The configuration is such that the motor 23 is controlled by a feed pattern through the control circuit 26.

Next, the operation will be explained.

When the hot water taps 17 and 18 are not in use and the circulation operation switch (not shown) is turned on, the circulation pump 20 is operated according to the temperature detected by the temperature sensor 21. Start Stop 1- is done.

That is, when the temperature inside the hot water supply pipe 13 is lower than the set temperature, the circulation pump 20 is started to send hot water from the hot water heat source device 12 into the pipe, and when the temperature reaches a predetermined temperature, the circulation pump 2 is started.
The operation of the circulation pump 20 is stopped to prevent unnecessary heat radiation from the piping and to reduce the power consumption of the circulation pump 20. When the hot water tap 17 or 18 is opened, hot water is immediately supplied because the inside of the hot water feed pipe 13 is filled with hot water at a predetermined temperature.

When the hot water tap is closed, it returns to the original circulation mode.

During circulation operation, the amount of heat radiated from the hot water supply return pipe 19 is less than that of the conventional system because the pipe has a small cross-sectional area and is heat-insulatingly coated in two pipes. In addition, since the circulation pump 20 is operated according to the temperature inside the hot water supply pipe 13 and is not operated constantly, there is less heat radiated from the pipe, and the power consumption of the circulation pump 20 is also reduced. Finish.

The advantage of this embodiment is that since the hot water supply pipe 13 and the hot water supply return pipe 19 are heat-insulatingly coated as two units, it is easy to handle during construction, and the outer surface area can be set to be small, so the heat insulation effect is excellent. .

Further, the circulation pump 20 stops operating when the temperature inside the hot water supply pipe 13 is high due to the temperature detector 21 and the amplifier 22.
Since it is controlled to operate when the temperature is low, power consumption can be reduced and heat radiation loss from the pipes can also be reduced.

Effects of the Invention The present invention uses a hot water supply return pipe that has a smaller pipe cross-sectional area than the hot water supply return pipe, circulates hot water from the hot water heat source equipment using a circulation pump, and controls the temperature rise at the hot water tap during hot water supply. The hot water supply return pipe has a small cross-sectional area, which reduces heat loss during hot water circulation, and the pipe material is thinner, making it easier to install and saving on materials. It is.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing a conventional circulating hot water supply system, Fig. 2 is a system diagram of a circulating water supply system according to an embodiment of the present invention, and Fig. 3 is a system diagram showing a conventional circulating water supply system.
The figure is a sectional view of the hot water mixing valve. 12 Hot water heat source equipment, 13. Hot water supply pipe, 17.18
- Hot water tap, 19... Hot water return pipe, 20- Circulation pump, 21 - Temperature detector (controller), 22... Amplifier (controller). Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 2

Claims (1)

[Claims] (1) A hot water supply heat source machine, a hot water supply pipe connected to the hot water supply heat source machine; and,
A circulating hot water supply device comprising a hot water faucet that supplies and stops hot water, a circulation pump that circulates hot water from the hot water supply heat source device from a hot water supply pipe to a hot water return pipe, and a controller that controls the operation of this circulation pump. 2) A circulating hot water supply device according to claim 1, wherein the hot water supply pipe and the hot water return pipe are integrally heat-insulatingly coated. a The controller detects the temperature inside the hot water supply pipe or the hot water supply return pipe to control the start/stop of the circulation pump.
Circulating water heater as described in section.