JP3041746B2 - Water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply apparatus for supplying hot water to a home bathtub or the like.

[0002]

2. Description of the Related Art A conventional water heater will be described below.

[0003] As shown in FIG.
2a, the water supplied from the water supply port 34 to the hot water storage tank 35 via the pressure reducing valve 33 is heated by a heater 36 disposed in the hot water storage tank 35 using late-night electric power and stored.

The hot water in the hot water storage tank 35 is guided from a tap hole 37 to a mixing tap 39a on the hot water side via a hot water supply pipe 38 when necessary, and water is supplied from a water supply source 31 via a pipe 32b to a water supply tap 3a.
9b.

[0005] The hot water supply apparatus configured as described above can supply hot water of an appropriate temperature by adjusting the mixing plugs 39a and 39b when hot water is poured into the bathtub 40.

As a measure for preventing freezing of the hot water supply pipe 38, a treatment for manually operating the antifreeze heater 41 in the hot water supply pipe 38 when necessary and a process of draining water from the hot water supply pipe 38 after use have been performed.

As an anti-freezing measure, an invention has been made in which the anti-freezing device is appropriately operated only when necessary according to the detected outside air temperature or the presence or absence of water in the bathtub, thereby suppressing wasteful power consumption. -15963, JP-A-Hei 2
-52946).

[0008]

However, in the above-mentioned conventional configuration, when the freezing is likely to occur, it is necessary to manually take measures to prevent the freezing, so that it takes time and effort. There is a problem that freeze breakage occurs.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a hot water supply apparatus that reliably and effectively prevents freezing of a hot water supply pipe and does not waste power consumption.

[0010]

In order to achieve the above object, a hot water supply apparatus according to the present invention comprises a reheating circuit having a reheating heater and a pump for heating and circulating hot water in a bathtub, hot water from a hot water storage tank and a water supply pipe. A hot and cold water mixing valve for mixing water from
The hot water mixing valve and the reheating circuit are connected to mix hot water.
A hot water supply circuit, and a temperature detector disposed in the additional heating circuit and configured to detect a temperature of the hot water .
Ri when tapping into the bathtub, first, the water side of the hot and cold water mixing valve
A fully open, and the hot water side to fully closed, the temperature of the water from the water supply pipe
The temperature is detected by the temperature detector, and thereafter, control is performed so that the hot water is discharged at a predetermined set hot water temperature.
When that falls below the set water temperature was set in advance, stop the bath operation
After stopping, a predetermined freezing prevention operation is performed .

[0011]

[Function] In this configuration, when the bath operation starts, the water supply pipe
To detect the temperature of the water supplied from
If there is a possibility of freezing, take a bath
Check that the temperature of the piping does not drop even after the operation is stopped.
Bath operation is performed because constant freezing prevention operation is performed.
Piping freezing accidents that occur during shutdown can be reliably prevented.
It is.

[0012]

An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, water in a water supply pipe 1 supplied from a water supply source is depressurized through a pressure reducing valve 2 and is sent to a hot water storage tank 4 through a water side valve 3a of a hot / water mixing valve 3 and a water supply pipe 1a . It is subjected <br/> feeding and. Hot water that has been heated and stored using electric power at midnight by a heater 5 disposed in a hot water storage tank 4 is supplied to a hot water supply pipe 7 to a kitchen and a hot water supply pipe 8 to a washroom via a hot water supply pipe 6, and is also supplied to the hot water supply pipe. 6a, the hot water side valve 3 of the hot water mixing valve 3
b. Operation units such as the bathroom remote controller 9 and the kitchen remote controller 10 have various modes of bath operation.
Switches are arranged, for example, for hot water supply to
Open the operation result <br/> controller 12 pouring the solenoid valve 13 automatically switches 11 for automatically fired operation, is adjusted in the mixer valve 3 in hot water temperature of the suitable temperature based on the signal of the temperature detector 14 Hot water is supplied to the bath 16 through the outgoing pipe 15. When the preset hot water temperature and the water level detected by the water level sensor 17 reach the preset water level, the hot water supply is stopped. When the temperature of the hot water in the bathtub 16 decreases, the hot water in the bathtub 16 is driven by the pump 18, passes through the return pipe 19, passes through the two-way valve 20 and the flow switch 21, is heated by the reheating heater 22, and passes through the forward pipe 15. And a pouring circuit connected to the reheating circuit via a pouring electromagnetic valve 13 for discharging and stopping the mixed hot water.

The operation of the water heater configured as described above will be described below.

[0015] The anti-freeze operation, Sui of wind Lu remote control 9
When the bath operation is started by operating the switch, for example, FIG.
As shown in FIG.
When hot water is supplied, the automatic mode is turned on. First, the water-side valve 3a of the hot-water mixing valve 3 is fully opened , and the hot-water side valve 3b is fully closed.
Only water supplied from the water pipe 1 is reheated via the pouring circuit
And the temperature is detected by the temperature detector 14. Next
To, to compare the water temperature and the advance in the controller 12 in the memory to Aru set temperature (eg 5 ° C.), if more of the water temperature is lower than the set temperature, it is determined that the possibility of freezing exists bath
After the end of operation, for example, an automatic mode (pre-hot-water supply at the start of, for example 4 hours, the hot water temperature of the tub 16, a mode for holding the water level) Ri ON after completion of the freeze prevention operation mode as shown below, the water temperature is set If it is higher than the temperature,
The bath operation ends. Then, anti-freeze luck rolling mode
Is operated differently depending on the remaining hot water in the bathtub 16.
When there is no remaining hot water in the bathtub 16, the pump 18 is operated only once for a predetermined time and the outgoing pipe 15 and the return pipe 19 are operated.
The remaining hot water inside is drained to the bathtub 16 and returned to the outgoing pipe 15.
A state frozen in the tube 19 does not occur, then does not freeze prevention operation, and when there is the remaining hot water in the bathtub 16, a predetermined time (e.g. 30 minutes) Jo Tokoro time pump 18 for each <br / > driving, by circulating through the pipe 15 forward and the pipe 19 back to hot water bath 16 from the bath 16, so as to prevent freezing by raising the temperature of the frozen easily forward pipe 15 and return pipe 19 I have . The determination as to whether or not there is remaining hot water in the bathtub 16 is made based on the signal value of the water level sensor 17.

As described above, according to the present embodiment, bath operation
There is a risk of freezing by detecting the water supply temperature at the start
The water supply temperature is low and there is a risk of freezing.
Only when the pump 18 operates as shown in the above embodiment.
It is designed to perform a prescribed anti-freezing operation mainly with
Judgment of the possibility of freezing due to outside temperature
Makes it possible to judge freezing more accurately than
And take manual measures to prevent freezing, or forget
And return pipe 1 and return pipe 1
9 can be reliably and effectively prevented, resulting in waste of power consumption.
Can be prevented from occurring.

According to another embodiment , a reheating heater 22 for heating and circulating hot water in the bathtub 16 and a pump 18 are provided.
A reheating circuit, a hot water mixing valve 3 for mixing the hot water from the hot water storage tank 4 and the water from the water supply pipe, and the hot water mixing valve.
And pouring circuit mixed hot water connected to the <br/> Reheating circuit via the pouring solenoid valve 13 for tapping-stop water that, a temperature detector 14 for detecting the water temperature provided in the reheating circuit , a two-way valve 20 for switching the reheating circuit and the pouring circuit,
The reheating heater 22, the pump 18, and the hot and cold water mixing valve 3
· Note the unit constituted by a controller 12 which controls the hot water solenoid valve 13 and temperature detector 14, the two-way valve 20, the forward pipe 15 and return line 19 connecting the said unit tub 16
When, an operation unit for operating the unit, the operating unit
When the hot water is supplied to the bathtub 16 when the bath operation is started , first, the water side of the hot / water mixing valve 3 is fully opened , and the hot water side is fully opened .
Close it and measure the temperature of water from the water supply pipe with the temperature detector 1
4 and then control so that hot water is discharged at a predetermined set hot water temperature, and the water temperature detected by the temperature detector 14 is set in advance.
When that falls below a the set water temperature was stopped the bath operation
After that, depending on the remaining hot water in the bathtub,
Preventive operation is performed. According to this configuration, each
Eye configuration so that unitization seed components
This not only simplifies the operation but also detects the water detected at the start of bath operation.
The temperature makes it possible to reliably determine the freezing, and
Prevention of free hot water in bathtub 16 after bath operation
To operate in different operation modes as described above
To perform more efficient antifreeze operation
It can be, can so as not to cause of the power used waste.

[0018]

As is clear from the above description, the present invention provides a reheating circuit comprising a reheating heater and a pump for heating and circulating hot water in a bathtub, a hot water mixing device for mixing hot water and water from a hot water storage tank. It is equipped with a valve and a temperature detector that detects the temperature of the hot water arranged in the reheating circuit .
Fully open the water side of the hot and cold water mixing valve , fully close the hot water side , detect the water supply temperature with the temperature detector, control the water to be discharged at the set hot water temperature, and check the water supply temperature detected by the temperature detector. when that falls below the <br/> set water temperature set in advance, it is determined that the possibility of freezing exists bath
After the bath operation including hot water to the tank is completed,
With the configuration in which the stop operation in the row Migihitsuji, the freezing of the hot water supply pipe to reliably and effectively prevent, those that can achieve excellent water heater waste does not occur in the power used.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a hot water supply apparatus according to one embodiment of the present invention.

FIG. 2 is a sequence diagram at the time of preventing freezing of the water heater.

FIG. 3 is a schematic configuration diagram of a conventional hot water supply device.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 water supply pipe 3 hot and cold water mixing valve 4 hot water storage tank 9 bath remote controller (operation unit) 12 controller 13 pouring solenoid valve 14 temperature detector 15 outgoing pipe (hot water supply pipe) 16 bathtub 18 pump 19 return pipe (hot water supply pipe) 20 two-way Valve 22 reheating heater

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-6345 (JP, A) JP-A-3-31256 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24H 1/00 602

Claims (2)

(57) [Claims] And 1. A reheating having reheating heater and pump for heating circulating the hot water of the bathtub circuit, the hot water from the hot water storage tank feed
And hot and cold water mixing valve for mixing water from the water pipe, the hot water mixed
Connect the joint vent and the reheating circuit to supply mixed hot water.
A hot water circuit and a temperature detector disposed in the reheating circuit for detecting hot water temperature are provided. When the hot water is supplied to the bathtub according to a bath operation start instruction , first, the water side of the hot / water mixing valve is fully opened ,
Side is fully closed and the temperature of water from the water supply pipe is
The temperature is detected by a tapping device, and then the water is controlled to be discharged at a predetermined set hot water temperature, and the water temperature detected by the temperature detector is set in advance.
When that falls below the setting water temperature was, after stopping the bath operation,
A water heater that performs a predetermined freezing prevention operation . 2. A reheating circuit having a reheating heater and a pump for heating and circulating hot water in a bathtub, a hot water mixing valve for mixing hot water from a hot water tank and water from a water supply pipe, and mixing by the hot water mixing valve. A pouring circuit connected to the reheating circuit via a pouring solenoid valve for discharging and stopping hot water, a temperature detector disposed on the reheating circuit for detecting a temperature of the hot water, the reheating circuit and the reheating circuit, A two-way valve for switching to a pouring circuit, and a unit having a controller for controlling the reheating heater, pump, hot-water mixing valve, pouring solenoid valve, temperature detector, and two-way valve, A hot water supply apparatus comprising an outgoing pipe and a return pipe connecting a unit and the bathtub, and an operation unit for operating the unit, wherein a bath operation from the operation unit is opened.
When tapping into the tub by Hajimeji, first, fully open the water side of the hot and cold water mixing valve, and the hot water side to the fully closed, the water supply pipe
The temperature of the water detected by the temperature detector, then controlled to tapping a predetermined <br/> set hot water temperature, and that falls below the set water temperature of the water temperature detected by the temperature detector is set in advance Time is said
After stopping the bath operation, depending on the remaining hot water in the bathtub,
Water heaters that perform different freezing prevention operations .