JPH04222330A - Supplying device of hot water - Google Patents

Abstract

PURPOSE:To provide the title device which actualizes instantaneous supply for hot water and prevention against freezing, without specially using a circulating circuit and a complicated device and without wastefully using energy, and also makes the control of hot-water temperature to be supplied possible. CONSTITUTION:The title device consists of a hot and cold water-mixing valve 15 for controlling a mixture ratio between heated water and service water, a control valve 18 for discharging or stopping mixed-water, a thermal detector 17 for the mixed-water, an end outlet 16 for hot-water supply, another thermal detector 17 for water temperature in a pipe line, and a controller 19. When the water temperature in the pipe line drops, a control valve 18 is opened on the basis of a signal from the thermal detector 17 and discharges water of which the temperature drops, through the end outlet 16 or a control valve is provided on a branch line from a heated-water supply pipe 13 and discharges the water through this branch line. In this way, instantaneous supply for hot water and prevention against freezing are actualized.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. 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 above a predetermined value when hot water supply is stopped and achieves instantaneous hot water supply and freezing prevention.

0002

2. Description of the Related Art Conventionally, there has been a water heater of this type as shown in FIG. (For example, Utility Model 56-13544
Publication No.).

In FIG. 3, 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 produced by the hot water supply heat source device 2 is circulated from the hot water supply pipe 4 to the hot water supply return pipe 5 by a 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.
A water supply pipe 7 for supplying water from the cistern 1 is also connected to the cistern 1 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. Reference numeral 11 denotes 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.

[0005]

[Problems to be Solved by the Invention] Since the conventional circulating hot water supply apparatus 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 electric power, so a large amount of energy is required.

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

(3) During hot water supply, the hot water mixing valve 8:
Since the hot water from the hot water supply heat source device 2, the water from the water supply pipe 7, and the circulating hot water from the hot water supply return pipe 5 are mixed, it is not possible to maintain a low temperature, and the hot water supply temperature is limited.

The present invention solves these conventional problems, and provides a water heater that can realize instantaneous hot water supply and freeze prevention without using a circulation circuit or circulation pump, and can also adjust the hot water temperature. The purpose is to

0010

[Means for Solving the Problems] In order to achieve this object, the water heater of the present invention includes a ratio control valve that adjusts the mixing ratio of hot water and water, a mixed water temperature detector that detects the mixed water temperature, A mixing water temperature setting device that sets the mixed water temperature, a temperature detector that detects the temperature of piping, a control valve that discharges and stops the hot water, a discharge path that discharges hot water, and a mixing water temperature setting device. and a controller that controls the ratio control valve based on the signal from the temperature sensor and compares the signal from the mixed water temperature sensor with the mixing water temperature sensor.

[0011]

[Operation] With the above-described configuration, the hot water supply device of the present invention opens the control valve to discharge the hot water from the wiring path when the temperature of the hot water remaining when the hot water is not in use drops, and closes the control valve when the temperature rises. At the same time, the ratio control valve performs normal temperature control, realizing instantaneous hot water supply and freezing prevention.

0012

[Embodiment] Next, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

In FIG. 1, a hot water supply pipe 13 and a water supply pipe 14 that supply hot water from a hot water supply heat source device 12 are connected to a hot water mixing valve 15, and the mixed hot water whose temperature is regulated by the hot water mixing valve 15 is fed to a terminal hot water supply port. 16. After the hot water mixing valve 15, a hot water temperature thermistor 17, which is a mixing water temperature detector, and a control valve 18, which opens and closes the mixed hot water flow path and adjusts the flow rate, are provided in the mixing flow path. 15 is controlled by a controller 19. 20 is a mixing water temperature setting device of the hot water mixing valve 15.

FIG. 2 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 is composed of a ratio control valve 21 for adjusting the mixing ratio, a hot water temperature thermistor 17 for obtaining a signal for adjustment, and the above-mentioned mixed hot water temperature setting device 20. The ratio control valve 21 has a hot water side valve body 22 and a water side valve body 23.
is provided on the valve shaft 24 with both ends restricted and biased outwardly by a spring 25, and the valve shaft 24 is driven via a gear box 27 by an external motor 26. The controller 19 compares the temperature set by the mixing hot water temperature setting device 20 and the temperature detected by the hot water temperature thermistor 17, and adjusts the ratio control valve 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 and regulating the flow rate 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. The controller 19 has a function unit that controls the hot water mixing valve 15 and the control valve 18, and allows the ratio control valve of the hot water mixing valve 15 to face a preset position when hot water supply is not in use, as well as a time control function. .

Next, the operation of this embodiment will be explained. When the temperature is set with the mixing water temperature setting device 20 and a switch (not shown) is turned on, the control valve 18 is opened and the hot water mixing valve 15 is opened.
The mixing ratio of hot water and water is adjusted so that the temperature set by the mixed hot water temperature setting device 20 is obtained, and hot water as set is supplied from the terminal hot water supply port 16. When the mixed hot water temperature setting device 20 is turned off, the control valve 18 is closed and hot water supply is stopped. When hot water supply is stopped and the temperature around the hot water temperature thermistor 17 falls below a 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. The cold hot water in the hot water supply pipe 13 is then discharged, and the hot water from the hot water heat source device 12 is filled in the hot water supply pipe 13.
When the temperature around the hot water temperature thermistor 17 rises above a set value, the control valve 18 is closed to an opening degree that allows a small flow of water to flow. During this operation when hot water supply is not in use, the hot water side valve body 22 of the ratio control valve 21 of the hot water mixing valve 15 is fully opened, and the water side valve body 23 is fully closed. In other words, when the cold water is discharged, the water is not mixed with the water and discharged. In this way, the hot water supply pipe 13 is always filled with hot water so that hot water at the desired temperature can be obtained immediately when hot water supply is restarted. Although the above control is an operation for instantaneous hot water supply, 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 hot water in the cold water supply pipe 13 and the water in the cold water supply pipe 14 are discharged from the terminal hot water supply port 16. Since the hot water or water can be replaced with hot water or hot water, it is possible to prevent freezing. In this anti-freezing operation, the ratio control valve 21 of the hot water mixing valve 15
In this case, the positions of the hot water side valve body 22 and the water side valve body 23 are set to 1 in advance.
When the control valve 18 is opened, both hot and cold water are discharged to prevent freezing of both. Regarding this ratio of hot water to water, since water has a lower temperature, more water is discharged to promote flow. Since the controller 19 has a timed control function, by setting the operating time for instant hot water supply and antifreeze applications, hot water or water can be constantly discharged or discharged without stopping. It can save energy by operating only during certain hours.

[0016] The method of this embodiment in which hot water is discharged from the terminal hot water supply port has the advantages that there is no need to provide a special piping route for discharging, the user can confirm the discharge operation, and that the discharged water It is advantageous in that it can be stored in a bathtub or the like and reused.

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, but the control valve is provided by branching directly from the hot water supply pipe 14, and It may be discharged directly from the In this case, since the branch can be placed in a concealed part, it is difficult to directly see the operation during drainage, but it is aesthetically advantageous because it is not visible to the user, and it occurs when the hot water pipe is cold. This has the advantage of eliminating the inconvenience of a large amount of mixed hot water having a temperature significantly different from the set temperature being supplied from the terminal hot water supply port 16.

Further, even with this configuration, the ratio control valve 21
By setting the ratio to an appropriate ratio so that both the hot water side and the water side are open, it is possible to prevent both paths from freezing.

[0019]

As described above, the water heater of the present invention has a hot water mixing valve, controls the opening and closing of the control valve based on the signal from the temperature detector that detects the pipe temperature, and discharges hot water from the discharge path. This has the following effects:

(1) Instant hot water supply is possible without using a circulation circuit or circulation pump, and since there is no hot water return pipe as in the past, heat radiation loss can be reduced, and the structure is simple, inexpensive, and energy-saving. be able to.

[0021] Furthermore, since a ratio control valve is used, the hot water temperature can be adjusted, and since hot water and water are in communication, both are discharged from the discharge path when the control valve is opened, making it possible to provide instant hot water supply and to prevent freezing. be.

(2) Furthermore, when hot water is discharged from the terminal hot water supply port, there is no need to provide a special discharge path, which simplifies the configuration, and it is also possible to check the discharge operation and reuse the discharged hot water. can be easily done.

(3) In addition, if a control valve is provided on the branch route, it is possible to make the branch route face the concealed pay part.
It is aesthetically pleasing and occurs when the hot water in the hot water supply pipes is cold.
It is also possible to prevent low-temperature water at an uncomfortable temperature from being supplied from the ratio control valve.

[Brief explanation of the drawing]

[Fig. 1] Diagram of a hot water supply system using a water heater according to an embodiment of the present invention

[Figure 2] Cross-sectional view of main parts of the same example

[Figure 3] System configuration diagram showing a conventional water heater

[Explanation of symbols]

13 Hot water supply pipe 14 Water supply pipe 17 Hot water temperature thermistor (mixed hot water temperature detector, temperature detector) 18 Control valve 19 Controller 20 Mixed hot water temperature setting device 21 Ratio control valve

Claims (3)

[Claims] Claim 1: A ratio control valve for adjusting the mixing ratio of hot water and water connected to a hot water supply pipe; a mixed water temperature detector for detecting the mixed water temperature; and a mixed water temperature for setting the mixed water temperature. a setting device,
Compare signals from a temperature detector that detects the temperature of the piping, a control valve that discharges and stops the hot water, a discharge path that discharges the hot water, the mixed hot water temperature setting device, and the mixed hot water temperature detector. and a controller that adjusts the ratio control valve based on a signal from the temperature sensor. 2. The hot water supply device according to claim 1, wherein a discharge path for discharging hot water also serves as a supply route for mixed hot water, and the hot water is discharged from a terminal hot water supply port. 3. The hot water supply apparatus according to claim 1, wherein the discharge route for discharging hot water is a branch route branching from the hot water supply pipe, and a control valve is provided in this route.