JPH057611B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a water heater that maintains the temperature of hot water in a hot water supply pipe at a predetermined value or higher when hot water supply is stopped and realizes instantaneous hot water supply.

Conventional Structure and Problems There has been a conventional water heater of this type as shown in FIG.

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 through a hot water supply pipe 4. 11
is a flow switch 2, which determines whether the hot water taps 9 and 10 are open or not 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 water supply mixing valve 8 receives hot water from the hot water heat source device 2, circulating hot water from the hot water supply return pipe 5, and water supply pipe 7.
It is supplied by mixing water from

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, there is a large heat radiation loss from the hot water supply pipe 4 and the hot water return pipe 5, and the circulation pump 6 also consumes electricity, so a large amount of energy is required.

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

Purpose of the Invention The purpose of the present invention is to solve these conventional problems, and it is an object of the present invention to provide a water heater that can instantaneously supply hot water without using a circulation circuit or a circulation pump, and can also adjust the temperature of hot water. shall be.

Structure of the Invention In order to achieve this object, the present invention provides a hot water supply pipe that supplies hot water from a water heater heat source device, a water supply pipe that supplies water, a hot water mixing valve to which these hot water supply pipes and the water supply pipe are connected, and a terminal hot water supply pipe. a control valve for discharging and stopping the discharging of hot water; a hot water temperature detector for detecting the temperature of mixed hot water; A water heater is configured with a controller that controls the opening and closing of a control valve based on signals from the water heater, and when the water temperature drops, the control valve is opened to discharge the low-temperature water, and when the water temperature rises, the control valve is closed. This ensures that the inside of the hot water supply pipe is always filled with hot water at a predetermined temperature or higher.

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

In FIG. 2, hot water pipes 13 and 14 that supply hot water from the hot water heat source device 12 are connected to a hot water mixing valve 15, and the mixed hot water whose temperature is controlled by the hot water mixing valve 15 is supplied from the terminal hot water supply port 16. Supplied. A hot water temperature thermistor 17 and a control valve 18 for discharging and stopping hot water are provided after the hot water mixing valve 15. This control valve 18 and the hot water mixing valve 15 are connected to a controller 19.
controlled by 20 is a mixed hot water temperature setting section of the hot water mixing valve 15. FIG. 3 shows details of the hot water mixing valve 15 and the control valve 18. The hot water mixing valve 15 is of an automatic temperature control type, and the ratio control valve section 2 adjusts the mixing ratio.
1, a hot water temperature thermistor 17 that obtains a signal for adjustment, and the aforementioned mixed hot water temperature setting section 20. The ratio control valve section 21 has a hot water side valve body 22 and a water side valve body 23.
However, with both ends restricted by the valve stem 24, the spring 25
The valve shaft 24 is driven by an external motor 26 via a gear box 27. The controller 19 compares the temperature set by the mixed hot water temperature setting section 20 and the temperature detected by the hot water temperature thermistor 17, and adjusts the ratio control valve section 21 to a mixing ratio that provides the set temperature. In the control valve 18, a valve body 28 for opening and closing a flow path is attached to a valve shaft 29, and the valve shaft 29 is driven by an external motor 30 via a gear box 31. The temperature signal detected by the hot water temperature thermistor 17 is used to control the hot water mixing valve 15 and the control valve 18. Note that the controller 19 also has a time control function.

Next, the operation of this embodiment will be explained.

When the temperature is set in the mixed hot water temperature setting section 20 and a switch (not shown) is turned on, the control valve 18 is opened and the hot water mixing valve 15 turns on the hot water so that the temperature set in the mixed hot water temperature setting section 20 is obtained. The mixing ratio of water and water is adjusted, and the set hot water is supplied from the terminal hot water supply port 16. When the mixed hot water temperature setting section 20 is turned off, the control valve 18 is closed and hot water supply is stopped. When the hot water supply is stopped and the temperature around the hot water temperature thermistor 17 falls below the set value due to natural heat radiation,
The control valve 18 is forcibly opened and cold hot water is discharged from the terminal hot water supply port 16. Then, the cold water in the hot water supply pipe 13 is discharged, and the hot water from the hot water heat source device 12 fills the hot water supply pipe 13. When the temperature around the hot water temperature thermistor 17 rises above the set value, the control valve 1
8 is closed. Thereafter, the control valve 18 is controlled to open or close via the controller 19 according to the temperature detected by the hot water temperature thermistor 17. Therefore, when hot water supply is restarted, the hot water in the hot water supply pipe 13 is not completely cold, and the hot water temperature at the terminal hot water supply port 16 can instantly reach the desired temperature level. The above control is an operation for instantaneous hot water supply, but this hot water supply device can also be used for anti-freezing purposes. That is, when the temperature detected by the hot water temperature thermistor 17 falls below a predetermined value, the control valve 18 is opened and the cold water supply pipe 1 is
The hot water in the water supply pipe 14 and the cold water in the water supply pipe 14 can be discharged from the terminal hot water supply port 16 and replaced with hot water or water at a higher temperature, making it possible to prevent freezing. Since the controller 19 has a timed control function, by setting the operating time for instant hot water supply and anti-freezing applications, hot water or water can be constantly discharged or discharged without stopping. It can save energy by operating only during certain hours. In this embodiment, the control valve 18 is provided after the hot water mixing valve 15, and the hot water is discharged from the terminal hot water supply port 16. It may be discharged. Further, although the hot water mixing valve 15 is an electrically driven automatic temperature control type in this embodiment, it may be a mechanical automatic temperature control type using a bimetal or wax thermometer, or a manual type.

To describe the effects of this embodiment, the controller 19
Since the control valve 18 is time-controlled, the hot water is discharged and the discharge is stopped only during the time period when hot water supply is required, so that energy saving can be achieved while maintaining convenience. In addition, since the terminal hot water supply port 16 also serves as the hot water discharge port, there is no need to take the trouble of creating a branch in the hot water supply pipe 13.

Effects of the Invention The present invention detects a drop in water temperature using a water temperature detector that detects the mixed water temperature when a water heater using a hot water mixing valve is not in use, and discharges the cold water from a control valve. However, since the hot water supply pipes are filled with hot water from the water heater, it has the following effects.

(1) Instant hot water supply is possible without the use of a circulation circuit or circulation pump, and since there is no hot water return pipe compared to conventional systems, heat radiation loss can be reduced, resulting in a simple configuration, low cost, and energy-saving water heater. can.

(2) Since a hot water mixing valve is used, it is possible to adjust the hot water temperature, and when the cold water is discharged using the control valve, both the hot and cold water are discharged as it is connected to the hot water, and can be used for instant hot water supply as well as anti-freezing purposes. be able to.

(3) The structure can be simplified because a single hot water temperature sensor can control the hot water mixing valve and control valves for instant hot water supply and anti-freezing.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing a conventional water heater, FIG. 2 is a configuration diagram of a water heater according to an embodiment of the present invention, and FIG. 3 is a sectional view showing details of a hot water mixing valve and a control valve. . 12...Hot water heat source machine, 13...Hot water pipe, 14...
... Wood supply pipe, 15 ... Hot water mixing valve, 16 ... Terminal hot water supply port, 17 ... Hot water temperature thermistor (hot water temperature detector, mixed water temperature detection section), 18 ... Control valve, 19 ... Controller, 20 . . . Mixed hot water temperature setting section, 21 . . . Ratio control valve section.

Claims (1)

[Scope of Claims] 1. A hot water supply pipe that supplies hot water from a hot water heat source device, a water supply pipe that supplies water, a hot water mixing valve to which the hot water supply pipe and the water supply pipe are connected, a terminal hot water supply port, and a water supply pipe that supplies hot water. A control valve that discharges and stops discharging; a hot water temperature detector that detects the temperature of the mixed hot water; and a hot water temperature detector that controls the hot water mixing valve based on the signal of the hot water temperature detector; A water heater comprising a controller that controls opening and closing of the control valve based on the control valve. 2. The water heater according to claim 1, wherein the controller controls the control valve in a timed manner. 3. The hot water supply device according to claim 1, wherein hot water is discharged from a terminal hot water supply port.