JPH058338B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an instant hot water supply device that instantly supplies hot water even when the piping from a heat source device to a terminal faucet is long, such as in a central hot water supply system.

1. Construction of conventional example and its problems Conventionally, this type of instant hot water heating apparatus has one shown in FIG. 1.

In FIG. 1, water is supplied from a water supply cistern 1 to a hot water supply heat source device 2 via a water supply pipe 3. The hot water made by the hot water heat source device 2 is sent to the hot water supply pipe 4.
The hot water is circulated from there to the hot water supply return pipe 5 by the circulation pump 6, and returns to the hot water heat source device 2 again via the water supply pipe 7 and the water supply pipe 3. A hot water mixing valve 8 is connected in the middle of the hot water supply pipe 4, and a water supply pipe 7 for supplying water from the cistern 1 is also connected to this hot water mixing valve 8 to mix hot water and water. The mixed hot water is supplied from hot water taps 9 and 10 via a hot water supply pipe 4. 1
1 is a flow switch, which determines whether the hot water taps 9 and 10 are open or closed as a flow rate value.

In operation, first, when the hot water taps 9 and 10 are 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 switch 11 detects that the flow rate is large and causes the circulation pump 6 to perform pressurized circulation. The remaining hot water supplied by the hot water taps 9 and 10 returns to the hot water heat source device 2 via the hot water return pipe 5. The hot water mixing valve 8 mixes and supplies hot water from the hot water supply heat source device 2, circulating hot water from the hot water supply return pipe 5, and water from the water supply pipe 7.

Since the conventional circulating hot water supply device was constructed as described above, it had the following problems.

(1) Since hot water is constantly being circulated, the hot water supply pipe 4,
The heat radiation loss from the hot water supply return pipe 5 was large, and the circulation pump 6 also consumed electric power, so a large amount of energy was required.

(2) Since the hot water supply return pipe 5 and the circulation pump 6 are required, equipment costs are expensive and the piping work is complicated.

(3) It is extremely difficult to install and modify an existing hot water supply system.

Purpose of the Invention The present invention solves these conventional problems, and provides an instant hot water device that can provide instant hot water supply without using a circulation circuit and that can be easily installed at the end of a faucet. The purpose is to provide.

Structure of the Invention In order to achieve this object, the present invention includes a large hot water supply heat source machine, a small hot water heat source machine, a hot water main pipe, a terminal hot water supply faucet, a branch from the hot water main pipe and passing through the small hot water heat source machine, A hot water supply bypass pipe that rejoins the hot water supply main pipe, a temperature detector provided near the junction of the hot water supply main pipe and the hot water supply bypass pipe, and a temperature detector provided on the hot water supply main pipe after branching to the hot water supply bypass pipe. It consists of a valve that opens and closes depending on the temperature level detected by the temperature sensor, a resistor installed in the hot water bypass pipe, and a check valve.The valve is switched depending on the water temperature level detected by the temperature sensor. Hot water is supplied through a hot water supply bypass pipe, and when the temperature is high, hot water is supplied directly from the hot water mains.

DESCRIPTION OF EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 2 and 3.

A hot water main pipe 14 for feeding hot water from a large hot water heat source device 12 to a hot water tap 13, and a hot water supply bypass pipe 15 that branches off on the downstream side of the hot water main pipe 14 and joins again are provided. Immediately after branching from the hot water supply bypass pipe, the hot water main pipe 14 is provided with a thermovalve 16 that automatically opens and closes depending on the water temperature level inside the hot water main pipe 14,
The hot water supply bypass pipe 15 includes a small hot water supply heat source device (auxiliary heat source) 17, a resistor 18 that throttles the flow rate of the hot water supply bypass pipe, and a reverse resistor that operates based on the difference in hot water pressure between the hot water supply main pipe 14 and the hot water supply bypass pipe 15. It consists of a stop valve 19.

Immediately after hot water supply starts, there is cold water inside the hot water main pipe 14, and the temperature of the water is low, so the thermo valve 1 is activated.
6 is closed and the cooled hot water flows into the hot water supply bypass pipe 15, and the high temperature hot water previously stored in the small hot water heat source device 17 is expelled and hot water is discharged from the hot water tap 13. When the water temperature in the hot water main pipe 14 gradually rises, the wax thermostat 20 of the thermovalve 16
Due to this action, the cylindrical shaft 21 extends and the valve body 22 operates in the opening direction. As a result, hot water is supplied from both the hot water supply main pipe 14 and the hot water supply bypass pipe 15, and the hot water pressure in the hot water supply main pipe 14 gradually increases.On the other hand, since the hot water supply bypass pipe 15 has a resistor 18, a pressure loss occurs. The hot water pressure in the hot water bypass pipe 15 is equal to that of the hot water main pipe 1.
The water pressure will be lower than that in 4. The pressure difference causes the check valve 19 to operate, stopping the hot water supply from the hot water supply bypass pipe 15 and allowing hot water to be supplied only from the hot water supply main pipe 14. In addition, when the hot water main pipe 14 is very long and the outside temperature is low, the rise in the temperature of the hot water in the hot water main pipe 14 is slow.
If the thermovalve 16 does not open, the resistor provided in the hot water supply bypass pipe 15 can throttle the flow rate and suppress the drop in the temperature of the hot water discharged from the small hot water heat source device 17.

Furthermore, when hot water supply is stopped, the thermovalve closes, thereby preventing heat radiation due to natural circulation in the loop consisting of the small hot water heat source device, the hot water bypass pipe, and the hot water main pipe.

It has the above effects.

The advantage of this embodiment is that by using a thermovalve in which a temperature detector and a valve that opens and closes depending on the detected temperature level are integrated, the configuration is simplified and equipment construction is facilitated. Furthermore, the thermovalve is also inexpensive, making it possible to reduce the cost of the device.

Another embodiment will be described using FIG. 4.

Similar to the above embodiment, a hot water supply bypass pipe 15 is provided alongside the hot water supply main pipe 14. The hot water main pipe 14 has a hot water main pipe 14 in the vicinity where it branches from the hot water supply bypass pipe 15.
A hot water temperature detector 23 is installed to detect the hot water temperature inside the water, and then an electric valve 24 is installed closest to the downstream area from the branch point.
will be established. The hot water supply bypass pipe 15 includes a small hot water supply heat source device 17 and a check valve 2 that also serves as a resistor to throttle the flow rate.
It consists of 5 parts. In addition, since the electric valve 24 is opened and closed depending on the water temperature level in the hot water main pipe, the water temperature detector 2
Input the water temperature detected by 3, and depending on the level,
A controller 26 that outputs an opening/closing operation signal to the electric valve 24
through.

When the temperature of the hot water detected by the temperature sensor 23 is low, such as immediately after the start of hot water supply, the controller 26 outputs a signal that causes the electric valve 24 to close. The electric valve 24 is closed, cooled hot water flows into the hot water bypass pipe 15, and hot hot water is discharged from the small hot water heat source device 17. When the water temperature detected by the temperature detector 23 becomes higher than the predetermined temperature,
The electric valve 24 is opened by the controller 26, and hot water is drawn directly from the hot water main pipe 14. At the same time, hot water main 14
The hot water pressure becomes higher than the hot water pressure in the hot water supply bypass pipe 15, the check valve 25 is activated, and hot water from the hot water supply bypass pipe 15 is stopped.

The advantage of this embodiment is that the electric valve 24 can be electrically controlled based on the temperature level detected by the temperature detector 23, so that the temperature settings for opening and closing can be controlled remotely. Furthermore, since the resistor and the check valve are integrated, the configuration can be simplified, equipment construction is easy, and costs can be reduced.

Effects of the Invention The present invention is capable of immediately supplying hot water at a predetermined temperature or higher via a small hot water heat source device that is an auxiliary heat source installed in a hot water supply bypass pipe when water supply starts or when a predetermined temperature cannot be obtained for some reason. However, when a predetermined temperature is reached, a valve installed in the main hot water supply pipe switches the hot water supply route and taps out the hot water, which has the following effects.

(1) Facility construction is simple because a small hot water heat source, hot water bypass pipe, etc. are installed near the terminal hot water tap without using a circulation circuit, and it can be easily installed on existing water heaters.

(2) Compared to conventional examples, the piping, valve structure, etc. are simpler, so the instant hot water converter is inexpensive and achieves energy savings.

(3) By keeping the valve installed in the hot water main pipe closed when the water heater is not in use, it is possible to prevent the hot water in the small water heater from radiating heat through natural circulation.

(4) Because the resistor installed in the hot water supply bypass pipe restricts the amount of hot water that comes out of the small hot water heat source,
High-temperature hot water can be supplied even if the heating capacity of a small water heater heat source device is not large.

[Brief explanation of drawings]

Figure 1 is a configuration diagram showing a conventional instant hot water production device, Figure 2
The figure is a block diagram of an instant hot water generating device showing one embodiment of the present invention, FIG. 3 is a sectional view showing details of the same thermo valve, and FIG. 4 is a diagram of an instant hot water generating device showing another embodiment of the present invention. The configuration diagram and FIG. 5 are cross-sectional views showing details of the same check valve. 12...Large hot water heat source machine, 13...Hot water tap, 1
4... Hot water main pipe, 15... Hot water bypass pipe, 16
...Thermo valve (water temperature detector, valve), 17
...Small water heater heat source machine, 18...Resistor, 19...
Check valve, 23... hot water temperature detector, 24... electric valve (valve).

Claims (1)

[Scope of Claims] 1. A first hot water supply heat source machine, a second hot water supply heat source machine, a hot water supply main pipe and a terminal hot water supply faucet, branching from the hot water supply main pipe and passing through the second hot water supply heat source machine, A hot water supply bypass pipe that rejoins the hot water supply main pipe, a temperature detector provided near the junction of the hot water supply main pipe and the hot water supply bypass pipe, and a temperature detector provided on the hot water supply main pipe after branching to the hot water supply bypass pipe. An instant hot water production device consisting of a valve that opens and closes depending on the temperature level detected by the hot water supply device, a resistor provided in the hot water supply bypass pipe, and a check valve. 2. The instant hot water generating device according to claim 1, wherein the temperature detector and the valve have a temperature sensing part and use a thermo valve that opens and closes the valve depending on the temperature sensing level. 3. The instant hot water production device according to claim 1, which uses an electric valve that is opened and closed by a controller depending on the temperature of a temperature sensor. 4. The instant hot water production device according to claim 1, which integrates a resistor and a check valve.