JP2004061013A - Electric water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To rationally carry out additional heating of particularly bathtub water in an electric water heater carrying out additional heating and heat insulation by circulating the bathtub water by an additional heating heat exchanger provided in a tank. <P>SOLUTION: A bypass passage 9a bypassing the additional heating heat exchanger 3 is provided in a bath circulating passage 8, and a bypass passage 9a side and an additional heating heat exchanger 3 side are changed over by a three way valve 9b. In an intermediate point of a change over, both the bypass passage 9a and the additional heating heat exchanger 3 are communicated, and at a start of additional heating, the three way valve 9b is fixed at the intermediate point and high temperature accumulated water of the heat exchanger 3 and low temperature circulating water are mixed to suppress overshooting. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric water heater for boiling water in a tank by using electric power at midnight, and more particularly to an electric water heater having a function of driving out hot water in a bathtub.
[0002]
[Prior art]
In recent years, there has been proposed an electric water heater capable of effectively using a calorie of hot water boiled with inexpensive late-night electric power to heat and drive a bath (Japanese Patent Application Laid-Open No. 2002-48414).
[0003]
The electric water heater is provided with a heat exchanger in a tank, and circulates hot water in a bathtub through the heat exchanger by a circulation pump.
[0004]
Further, a temperature sensor is provided on the tank body, and an upper heater and a lower heater are provided on the upper and lower portions of the tank, respectively.
[0005]
Then, a circulation pump circulates hot water in the bath tub through the heat exchanger, and drives the bath tub with high-temperature hot water in the tank to keep the temperature.
[0006]
In addition, when supplying hot water to a bath, the solenoid valve on the water side and the solenoid valve on the hot water side are opened to supply hot water and water to the bathtub at the same time with two pipes, so that bath water can be supplied in a short time.
[0007]
At this time, a mixing chamber is provided in the adapter so that high-temperature hot water does not blow out directly into the bathtub, and the mixture is previously mixed with water and poured.
[0008]
Further, when a temperature sensor detects a drop in the temperature of the hot water in the tank, the upper heater and / or the lower heater are energized as necessary to perform additional heating.
[0009]
[Problems to be solved by the invention]
However, in the above-mentioned conventional electric water heater, as a result, the high-temperature hot water of the water heater is directly supplied to the bathtub and mixed with the water by the adapter. Therefore, when a dedicated adapter is not used, there is a problem that high-temperature hot water directly blows out to the bath tub and involves a danger.
[0010]
The adapter itself mixes water and hot water from the two pipes when supplying hot water, and when circulating hot water in the bathtub, it is necessary to have a configuration that does not cause a short path, and there is also a problem that the configuration becomes complicated.
[0011]
In addition, since hot water and water are supplied to the bath circulation pipe through separate paths, a solenoid valve and a bordering device are required for each. In the conventional example, two check valves are arranged in series, which is simple. However, in recent years, a backflow accident to water supply has occurred, and it has been necessary to use a more reliable system for the edging device itself. In such a situation, there is also a problem that providing two hot water supply paths individually leads to an increase in cost.
[0012]
Furthermore, when the edge cutting device is configured using a vacuum break valve or the like that opens to the atmosphere when the pressure falls below a predetermined level, in the configuration of the conventional example, the water level sensor part drops to the atmosphere depending on conditions, and the water drops and the water level drops. There is also a problem that detection becomes impossible.
[0013]
In addition, at the time of bathing and keeping the bath warm, there is no means of mixing such as at the time of bath water supply in order to prevent a short path, so that hot water staying in the heat exchanger 4 at the start of bathing blows out from the adapter. There was a problem.
[0014]
Especially when the bath is kept warm, there may be people in the bathtub, it is not safe to overshoot up to 90 ° C at maximum, and sometimes hot water comes out even if you do not burn yourself. It is unpleasant.
[0015]
Further, in this type of electric water heater, in the winter, the circulation pump is driven by the outside air temperature to circulate the remaining hot water in the bathtub through the piping to prevent the bath piping from freezing. In the configuration of the conventional electric water heater, there is a problem in that the circulating water that cools the heat exchanger circulates even during the antifreezing operation, so that the amount of heat in the tank is wasted.
[0016]
The present invention solves the above-mentioned conventional problems, in which hot water and water are mixed in advance, and hot water is supplied in a short time by using two pipes simultaneously. An object of the present invention is to provide an electric water heater that does not become unsafe even when a general-purpose adapter is used.
[0017]
It is another object of the present invention to provide a safe and comfortable electric water heater by reducing overshoot due to high-temperature hot water staying in a heat exchanger with the same configuration even at the time of start-up and warm-up operation start.
[0018]
It is still another object of the present invention to provide an economical electric water heater that does not waste heat even when the circulation pump is driven other than after the freezing prevention operation or the heat retention operation.
[0019]
It is another object of the present invention to provide an electric water heater capable of detecting a bathtub water level even when a more reliable bordering device having the same configuration is used.
[0020]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a tank for storing hot water having a water supply port at a lower portion and a tap hole at an upper portion, a heating heater for heating water in the tank to make hot water, and a heating heater. A flush heat exchanger provided in the upper tank, a bath circulation path for circulating hot water in the bath tub via the flush heat exchanger, a bath circulation pump interposed in the bath circulation path for circulating hot water in the bath tub, A bath temperature thermistor that is interposed in the bath circulation path on the primary side of the entrainment heat exchanger and detects the temperature of the bath water; and a bypass path that bypasses the entrainment heat exchanger on the entrainment heat exchanger side of the bath circulation pump. And a three-way valve for switching the bath circulation path between the bypass path side and the follow-up heat exchanger side.
[0021]
When the anti-freezing operation is performed, the three-way valve can be switched to the bypass side to prevent the water from passing through the heat exchanger, so that the water in the pipes cooled in winter can be circulated through the heat exchanger. Waste of wasting can be eliminated.
[0022]
Also, since the three-way valve can be switched to the bypass path side during bath hot water supply, hot water adjusted to a predetermined temperature by mixing hot water with water by the mixing valve is driven out and the bath circulation path is bypassed without passing through the heat exchanger. It is possible to supply the hot water to the return pipe and supply the hot water in a short time, and it is also possible to prevent the problem that the hot water adjusted to a predetermined temperature is reheated by passing through the heat exchanger and the bath hot water temperature is shifted.
[0023]
Further, when the bathtub water level is detected, the three-way valve is set to the closed position. Therefore, even if an open-to-atmosphere type edging device is provided, the bath circulation path on the water level sensor side does not drop and the bathtub water level cannot be detected.
[0024]
Further, at the start of the driving operation and the warming operation, the three-way valve is stopped at the intermediate position for a certain period of time, and mixed with the high-temperature hot water retained in the purging heat exchanger and the low-temperature hot water or water retained in the bath circuit and cooled. Therefore, it is possible to efficiently reduce overshoot in which high-temperature hot water temporarily comes out of the adapter.
[0025]
Since all of these effects can be realized with a common simple common configuration, a high-performance electric water heater can be provided at low cost.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
The electric water heater of the present invention has a water supply port at a lower portion, a tank having a tap hole at an upper portion for storing hot water, a heating heater for heating water in the tank to make hot water, and an upper portion of the heating heater. A flush heat exchanger provided in the tank, a bath circulation path for circulating hot water in the bathtub through the flush heat exchanger, a bath circulation pump interposed in the bath circulation path to circulate hot water in the bathtub, and a bath circulation It has a bypass which bypasses the feed heat exchanger on the feed heat exchanger side of the pump, and a three-way valve which switches the bath circulation path between the bypass path side and the feed heat exchanger side.
[0027]
When the anti-freezing operation is performed, the three-way valve can be switched to the bypass path side so that it does not pass through the heat exchanger, so that the water in the pipes cooled in winter can be circulated through the heat exchanger. The waste of heat consumption can be eliminated.
[0028]
A mixing valve connected to a water supply pipe connected to a water supply port at a lower portion of the tank and a hot water outlet at an upper portion of the tank to mix hot water and water to supply hot water; and a tapping temperature sensor for detecting a mixed hot water temperature on a secondary side of the mixing valve. And a hot water supply pipe connecting the secondary side of the mixing valve and the bath circulation path or the bypass path, and a hot water supply valve interposed in the hot water supply pipe, so that the three-way valve is switched to the bypass path side during hot water supply. The bath hot water supply pipe was connected to a predetermined position of a bath circulation water channel or a bypass which does not pass through the heat exchanger when hot water is supplied.
[0029]
Then, by switching the three-way valve to the bypass side at the time of bath water supply, the bath water supply is performed using the pipes of the bath circulation path, so that the bath water supply can be performed in a short time. In addition, since the hot water adjusted to a predetermined temperature by mixing the hot water and the water with the mixing valve does not pass through the heat exchanger, it is possible to prevent a problem that the bath is reheated and the bath hot water temperature is shifted. .
[0030]
When the pressure becomes lower than a predetermined pressure, a rimping device is provided on the secondary side of the bath water supply valve of the bath water supply pipe to open the atmosphere and prevent the bath water from flowing back into the water supply pipe. A water level sensor that detects the bathtub water level is provided.When the bathtub water level is detected, the three-way valve is switched to the closed position that does not communicate with either the bypass path side or the draining heat exchanger side, and the hot water supply pipe is bypassed or driven off. The heat exchanger was connected to the bath circuit opposite to the three-way valve.
[0031]
Then, when detecting the bathtub water level, the three-way valve is switched so that the piping from the three-way valve to the bathtub is opened only to the bathtub, and since the water level sensor is provided on the piping, even if the edging device is opened to the atmosphere. There is no possibility that the water level sensor cannot detect the water level due to the influence.
[0032]
In addition, it is configured to communicate with both at the intermediate position between the bypass path side of the three-way valve and the follow-up heat exchanger side. At the intermediate position on the side of the heat exchanger, it was stopped so as to be in communication with both, and then switched to the heat exchanger side for chasing.
[0033]
At the start of the flushing, the three-way valve is connected to both the bypass path side and the flushing heat exchanger side, so that the circulating water flows to the flushing heat exchanger side, and the inside of the flushing heat exchanger before the flushing starts. The hot water that has accumulated in the hot water is pushed out, and also flows to the bypass path side, where the hot and cold water are mixed at the junction of the return path of the bypass path and the bath circulation path to suppress overshoot. be able to.
[0034]
In particular, since the circulating water at the start of the purging stays in the bath circulation pipe and is cooled, the effect of suppressing the overshoot is great.
[0035]
In addition, since the three-way valve is set to the bypass side or the closed position during non-driving, it is also necessary to prevent the heat in the tank from being wasted due to the generation of convection in the circulation path including the purging heat exchanger. Can be.
[0036]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the attached FIGS.
[0037]
In FIG. 1, reference numeral 1 denotes a tank, on which a heating heater 2 and a follow-up heat exchanger 3 are mounted. Reference numeral 4 denotes a boiling temperature sensor, which is attached to the upper part of the tank 1.
[0038]
Numeral 5 denotes a temperature sensor, which is mounted below the heat exchanger 3. 6 is a tank circulation path, 7 is a boiling circulation pump, and circulates water at the lower part of the tank 1 to the upper part of the tank 1. Reference numeral 8 denotes a bath circulation path, and reference numeral 9 denotes a bath circulation pump, which drives out hot water in the bathtub 10 and circulates it through the heat exchanger 3.
[0039]
Reference numeral 9a denotes a bypass passage, and 9b denotes a three-way valve for switching the bath circulation passage between the bypass passage 9a side and the heat exchanger 3 side. The three-way valve 9b is constituted by a ball valve and is driven in one direction.
[0040]
If stopped during the switching from the bypass path to the follow-up heat exchanger, communication with both the bypass path and the follow-up heat exchanger will occur, and circulating water will flow to the bypass 9a and the follow-up heat exchanger 3 simultaneously. I have. Further, if the stop is made in the middle of switching to the bypass path side after passing through the follow-up heat exchanger side, it is possible to set the closed position where the bypass path 9a and the follow-up heat exchanger 3 do not communicate with each other.
[0041]
In FIG. 2, (1) is in a state of communicating with the bypass path side, (2) is in a state of communicating with both the bypass path and the follow-up heat exchanger side at an intermediate position, and (3) is in communication with the follow-up heat exchanger side. State (4) shows the closed position where neither the bypass path side nor the follow-up heat exchanger side communicates.
[0042]
Reference numeral 11 denotes a remaining hot water temperature sensor, and three temperature sensors are vertically arranged on the side surface of the tank 1, and the temperature at each position is measured to detect the remaining hot water amount.
[0043]
Reference numeral 12 denotes a mixing valve, and reference numeral 13 denotes a tapping temperature sensor. The mixing valve 12 mixes high-temperature hot water from the tank 1 with water from a water supply pipe 14 and supplies the mixed water to a tapping pipe 15.
[0044]
The temperature of the mixed hot water is detected by a tapping temperature sensor 13, and the mixing valve 13 is controlled to control the temperature to a predetermined temperature.
[0045]
Reference numeral 16 denotes a bath temperature sensor. Reference numeral 17 denotes a water flow detector. When the bath circulation pump 9 is driven to detect water flow by the water flow detector 17, it is determined that there is bath water, and the temperature detected by the bath temperature sensor 16 at this time. Is detected as a bathtub temperature.
[0046]
Reference numeral 18 denotes a water level sensor, 19 denotes a bath water supply valve, and 19a denotes an edge cutting device. The bath water supply valve 19 is opened and closed in a series of sequences, and bath water can be filled in the bathtub to a predetermined water level based on the water level detected by the water level sensor 18. Reference numeral 20 denotes a hot water supply / water supply detector for detecting that hot water has been supplied by a curan or the like.
[0047]
The kitchen remote controller of FIG. 3 is installed in the kitchen to perform various settings of the water heater and displays the state of the water heater.
[0048]
That is, 21 is a hot water temperature setting switch, and 22 is a hot water temperature setting display. The hot water supply detector 20 detects that hot water supply has started, and controls the mixing valve 12 so that the temperature detected by the hot water supply temperature sensor 13 becomes the hot water supply set temperature set by the hot water supply temperature setting switch 20. Has become.
[0049]
Reference numeral 23 denotes a clock time setting switch, and reference numeral 24 denotes a clock time display. In accordance with the clock time, the hot water in the tank 1 is heated using inexpensive midnight power in accordance with a power system contracted with a power company.
[0050]
25 is a bath automatic switch and 26 is a bath automatic display lamp. By operating the bath automatic switch 25, the bath automatic operation can be turned ON / OFF. When the bath automatic operation is ON, the bath automatic display lamp 26 is turned on.
[0051]
Bath automatic operation automatically fills the bathtub according to the bath set temperature and bath set water level set by the bathroom remote control described later, and then automatically performs the warming operation and the hot water operation so as to maintain the bath set temperature and bath set water level Do it.
[0052]
Reference numeral 27 denotes a remaining hot water display, which displays four levels of remaining hot water. The remaining hot water level is determined when the temperature of the remaining hot water is detected at 60 ° C. or more by each of the temperature sensors 5 and the three remaining hot water temperature sensors 11, and when no more than 55 ° C. is detected, it is determined that there is no remaining hot water. A display corresponding to the number of detected temperature sensors as the remaining hot water level is performed.
[0053]
28 is an automatic switch, 29 is a hot water setting switch, 30 is a hot water setting display, and 31 is an automatic display. The remaining hot water setting display 30 indicates that when the remaining hot water amount detected by the remaining hot water temperature sensor 11 becomes equal to or less than the set remaining hot water amount, the heating heater 2 is energized, and the boiling circulation pump 7 is controlled to perform the hot-water boiling. It has become.
[0054]
The remaining hot water settings include “large”, “standard”, “small”, and “OFF”. “High” to “small” secure the corresponding amount of remaining hot water, and “OFF” indicates that the hot water runs out. This is a setting that is not performed.
[0055]
When the automatic switch 28 is set to the automatic ON state, the automatic display 31 is turned on, and the remaining hot water setting is automatically updated based on the past running-out operation history and the like by the hot water running-up learning means.
[0056]
The remaining hot water setting can also be manually changed by operating the remaining hot water setting switch 29. Also, the remaining hot water setting switch 29 is accepted regardless of whether it is ON or OFF. Even if you use only the summer shower and the hot water setting is OFF by the automatic cleaning function, if you want to boil the bath on that day, leave it ON. By setting the remaining hot water to "large", the amount of heat necessary for boiling the bath can be secured.
[0057]
Numeral 32 denotes an unfollowing display. When the driving temperature sensor 5 detects a temperature of 65 ° C. or less, the non-driving indicator 32 is turned on to notify that the driving is not activated.
[0058]
Reference numeral 33 denotes a heat retention display, which is lit when the bath automatic operation is turned on by the bath automatic switch 25 and the bathtub is completely filled with water in a series of sequences.
[0059]
The bathroom remote controller shown in FIG. 4 is installed in the bathroom to perform various settings of the bath function on the main body of the water heater, and displays the state of the bath function.
[0060]
34 is a hot water temperature setting switch, and 35 is a hot water temperature setting display. As with the kitchen remote control, the hot water supply temperature for hot water supply to the curan or the like can be set.
[0061]
36 is a bath water amount setting switch, 37 is a bath water level display, 38 is a bath temperature setting switch, and 39 is a bath temperature setting display. The amount of hot water supplied to the bathtub can be set as the bathtub water level by using the bath water amount setting switch 36. The set bath water level display 37 is displayed as a number and a bar.
[0062]
Further, the bathing temperature of the bathtub can be set by the bath temperature setting switch 38. The set bath set temperature is displayed on the bath temperature setting display 39.
[0063]
40 is a bath automatic switch, 41 is a bath automatic display lamp, and 42 is a heat retention display. The automatic bath operation can be turned ON / OFF with the bath automatic switch 40 in the same manner as the kitchen remote controller. The bath automatic display lamp 41 is lit when the bath automatic operation is ON. In addition, the heat retention display is turned on when bath filling is completed in a series of sequences with the bath automatic operation ON.
[0064]
Reference numeral 43 denotes a shunt switch, 44 denotes a shunt display lamp, and 45 denotes a certain shunt disable display. The trailing operation can be turned ON / OFF by the trailing switch 43. When the trailing operation is ON, the trailing display lamp 44 is turned on.
[0065]
In the chasing operation, when the hot water temperature in the tank 1 is 65 ° C. or higher, which can be chased, the three-way valve 9b is chased and switched to the heat exchanger side, and the bath circulation pump 9 is driven to drive the hot water in the bathtub. Circulate to exchanger 3 and boil for 5 minutes with hot water in tank 1.
[0066]
Like the kitchen remote controller, the overtaking impossible display 45 is lit when the temperature of the hot water in the tank has dropped to 65 ° C. or less and the overtaking cannot be performed.
[0067]
When the rejection switch 45 is pressed while the rejection indicator 45 is lit, the mixing valve 12 is fully opened and the bath water supply valve 19 is opened to supply hot water in the tank 1 to the bathtub for 3 minutes. Make a bath.
[0068]
In the boiling operation, the total amount of hot water in the tank 1 is heated up to 90 ° C. in the middle of the night in accordance with the electric power contract.
[0069]
The boiling operation will be described with reference to FIG. When the hot water in the tank is to be heated, the heater 2 is energized to heat the hot water above the heater 2 in S000. At this time, the hot water above the heating heater 2 is evenly heated due to convection, and a separation layer of hot water and water is formed immediately below the heating heater 2 due to a difference in specific gravity.
[0070]
If the boiling temperature sensor 4 detects 91 ° C. in S001, the boiling circulation pump 7 is driven in S002. When there is low-temperature hot water or water in the lower part of the tank 1, the upper part of the tank 1 is cooled. At this time, the shape of the outlet of the tank circulation path 6 is such that water is diffused, and the hot water at the top of the tank is cooled as a whole.
[0071]
When the boiling temperature sensor 4 detects less than 89 ° C. in S003, the process returns to S000 and stops the boiling circulating pump 7. The hot water in the upper part of the tank 1 is laminated from the specific gravity difference and is kept separated from the water in the lower part, and the amount is increased by the amount of the water supplied by the circulating pump 7 while boiling.
[0072]
Then, even if the boiling circulation pump 7 is driven, the temperature does not decrease. When the boiling temperature sensor 5 detects 94 ° C. in S004, it is determined that the temperature has risen to the lower part of the tank and the heating heater 2 and the circulation pump 7 are determined in S005. Is stopped, and the boiling of the whole amount is completed.
[0073]
The following operation will be described with reference to FIG. First, in S100, it is confirmed whether the temperature of the hot water in the tank 1 is a temperature at which the hot water can be driven. If the temperature is lower than 65 ° C., the bath circulating pump 9 is stopped in S101 without performing the purging operation, and the purging is completed by setting the three-way valve to the bypass side. However, here, the three-way valve 9b is on the bypass side before the start of purging, so that it is not driven as a result.
[0074]
In S100, when the flushing temperature sensor 5 detects 65 ° C. or more, flushing is enabled. In S102, the bath circulation pump 9 is turned on, the three-way valve 9b is set to the intermediate position, and the bypass passage 9a and the flushing heat exchanger 3 are simultaneously operated. Circulate hot water in the bathtub.
[0075]
If the flow of the circulating water is detected for 10 seconds by the flow check by the flow detector 17 in S103, the three-way valve 9b is driven in S104 to drive the heat exchanger.
[0076]
In S107 and S108, it is determined whether the driving operation is the driving operation or the warming operation of the automatic bath operation. In the case of the driving operation, the processing in S105 to S109 is looped while checking the driving time for 5 minutes in S109.
[0077]
If the temperature of the hot water in the tank 1 drops during the purging and the temperature is less than 65 in S105, and if no water is passed for one minute in S106, the purging is stopped at that point.
[0078]
If the purging is detected for 5 minutes in S109, it is confirmed in S110 that the bath temperature is higher than the bath set temperature by the bath temperature sensor 16, the bath circulation pump 9 is turned off in S101, and the three-way valve 9b is closed. Drive to complete the chasing.
[0079]
Originally, it is possible to use the time of boiling up the remaining hot water of the previous day by passing the determination of S110 even in the driving operation for slightly raising the temperature during bathing.
[0080]
If the bath automatic is ON in S107, only the bathtub temperature is checked by the bath temperature sensor 16 in S110. If the bathtub temperature reaches the bath set temperature, the bath circulation pump 9 is turned off in S101 and the three-way valve 9b is turned on. Drive to the closed position to complete the chasing.
[0081]
If the chasing operation is OFF in S108, the bath automatic operation and the chasing operation are turned off and the chasing operation is interrupted.
[0082]
Next, the bath filling operation will be described with reference to FIG. At the time of automatic bath operation, after performing this bath water filling operation, by performing a flushing operation, hot water at the bath set temperature is supplied to the bathtub 10 by the bath set water amount to complete a series of bath water filling.
[0083]
First, in S200, the bath circulation pump 9 is turned on, and the three-way valve 9b is driven to the bypass side.
[0084]
After circulating for one minute, the water flow detector 17 is checked in S201, and if there is no water flow, the bath tub is empty and the process proceeds to S202, and the bath circulation pump 9 is turned off, and the bath water valve 19 is opened to start bath water supply. I do.
[0085]
After the bath water supply is continued for 5 minutes in S203, the bath water supply valve 19 is closed and the bath circulation pump 9 is turned on in S204 to perform circulation for 1 minute.
[0086]
In step S205, the water flow detector 17 is checked. If there is no water flow, it is determined that the hot water in the bathtub does not accumulate in the adapter 10b, so that the bath water is further supplied for 2 minutes in steps S206 and S207, and the hot water accumulates in the adapter 10b in S205 again. Check if it is.
[0087]
In step S205, the water detector 17 is checked. If there is water, it is determined that hot water has come to the adapter 10b. In step S208, the bath circulation pump 9 is turned off, the three-way valve 9b is closed, and the data stabilization delay is delayed for 10 seconds in step S209. Then, the water level data is detected and the value is held.
[0088]
In S210, the hot water supply valve 19 is opened and the three-way valve 9b is set to the bypass side to start the hot water supply. In step S211 the bath water supply time is calculated from the water level data before the start of bath water supply and the bath water volume setting set by the bathroom remote controller, the bath water is supplied only for the calculated time, the bath water supply valve 19 is closed in step S212, and the three-way valve 9b is closed. Then stop the hot water supply.
[0089]
Also, when the presence of water flow is detected in S201, it is determined that there is remaining hot water in the bathtub, and the process branches to S208 to fill the bath until the bath water volume is set.
[0090]
Next, the freeze prevention operation will be described with reference to FIG. The freeze prevention operation is performed in order to prevent the bath circulation pipe from freezing and rupture or blockage of the pipe in winter, and is always executed when the bath filling operation and the flushing operation are not performed.
[0091]
In S300, the temperature at which the bath circulation path 8 freezes is detected using the bath temperature sensor 16. When the temperature of the bath temperature sensor falls below 2 ° C., the bath circulation pump 9 is turned on to prevent the bath circulation path 8 from freezing, and the remaining hot water in the bathtub 10 is circulated through the bath circulation path 8. At this time, the three-way valve 9b is set on the bypass path side.
[0092]
If no water flow is detected in S302, it is determined that there is no remaining hot water in the bathtub 10, the bath circulation pump 9 is turned off in S303, the three-way valve 9b is closed, and the process waits for 30 minutes in S304. This standby prevents the circulation pump 9 from continuing idling.
[0093]
If there is remaining hot water in the bathtub 10, the circulation is continued until 6 ° C or more is detected in S305, and when 6 ° C or more is detected, the bath circulation pump 9 is turned off in S306, the three-way valve 9b is closed, and the process returns to S300. .
[0094]
Next, the operation and operation will be described.
[0095]
First, a bypass 9a for bypassing the heat exchanger 3 is provided in the bath circuit 8, and the bath circuit is switched to the bypass when the circulation pump 9 is turned on by means of the three-way valve 9b except for the following operation. When performing the anti-freezing operation, it is possible to eliminate the waste of heat that is consumed by circulating the heat in the heat exchanger 3 after the water in the pipes of the bath circulation path 8 that has been cooled in the winter.
[0096]
In addition, the three-way valve 9b is switched to the bypass road side when detecting whether there is remaining hot water in the bathtub during the bath water filling operation or when circulating hot water to detect that the hot water has reached the adapter 10b. As in the case of using the heat, waste of heat can be eliminated.
[0097]
In addition, since the three-way valve 9b is also switched to the bypass path side during hot water supply, hot water adjusted to a predetermined temperature by mixing hot water with water by the mixing valve is driven out without passing through the heat exchanger. 8, the pipe pressure loss from the electric water heater to the bathtub 10 can be reduced, the bath can be supplied with hot water in a short time, and the hot water adjusted to a predetermined temperature is re-pumped through the heat exchanger. The problem that the bath temperature is shifted due to heating can also be prevented.
[0098]
Further, even if a tubing device that opens to the atmosphere is used instead of the conventional non-return valve system to prevent the bathtub water from flowing back into the water pipe when the water is cut off, the water level sensor can be set by closing the three-way valve 9b. Since the piping of the section is opened only to the bathtub, the water level can be reliably detected without water dropping.
[0099]
Also, when the bath water filling, freezing prevention, escaping, etc. are stopped, the three-way valve 9b is set to the closed position, and since the squeezing heat exchanger side is closed, the piping connected to the squeezing heat exchanger is cooled. It is possible to prevent convection caused by a temperature difference with hot water in the driven-out heat exchanger 3 and to prevent waste of heat escaping due to convection.
[0100]
In addition, during the start-up operation or bath automatic operation, the start-up operation is turned on every 15 minutes to keep the bath tub hot temperature constant. At the start of the heat retention operation, the three-way valve 9b is stopped at the intermediate position for a certain period of time, and the circulating water is driven out to the bypass road side. Since it is made to flow to the heat exchanger side at the same time, the high-temperature hot water that has stayed in the heat exchanger 3 and the low-temperature hot water or water that has stayed and cooled in the bath circulation path 8 are mixed, and temporarily from the adapter 10b. It is possible to efficiently reduce overshoot in which high-temperature hot water flows out.
[0101]
【The invention's effect】
As described above, the electric water heater according to claim 1 of the present invention is provided with a bypass which bypasses the heat exchanger in the bath circulation path, and bypasses the circulating water with the three-way valve to drive the bypass water side and the heat exchanger side. The three-way valve can be switched to the bypass side when performing the anti-freezing operation of the bath circuit, so that the water in the cold pipes in winter is driven away and heat is consumed by circulating through the heat exchanger. There is an energy saving effect that waste can be eliminated.
[Brief description of the drawings]
FIG. 1 is a main body configuration diagram showing a configuration of an electric water heater main body according to a first embodiment of the present invention.
FIG. 2 is a configuration diagram of a three-way valve of the electric water heater.
FIG. 3 is an external view of a kitchen remote control of the electric water heater.
FIG. 4 is an external view of a bathroom remote control of the electric water heater.
FIG. 5 is a flowchart showing a boiling operation of the electric water heater.
FIG. 6 is a flowchart showing a bath flushing operation of the electric water heater.
FIG. 7 is a flowchart showing a bath filling operation of the electric water heater.
FIG. 8 is a flowchart showing an operation of preventing freezing of the electric water heater.
[Explanation of symbols]
1 tank
2 Boiling heater
3 Chasing heat exchanger
8 Bath circuit
9 Bath circulation pump
9a Bypass road
9b Three-way valve
10 Bathtub
12 Mixing valve
13 Hot water temperature sensor
14 Water supply piping
15 Hot water piping
16 Bath temperature sensor
19 bath hot water valve
19a Edge cutting device

Claims (4)

A tank for storing hot water with a water supply port at the bottom and a tap hole at the top, a heating heater that heats the water in this tank to make hot water, and a follow-up heat exchange installed in the tank above the heating heater Bath, a bath circulation path for circulating hot water in the bath tub through this flushing heat exchanger, a bath circulation pump interposed in the bath circulation path for circulating hot water in the bath tub, and a flushing heat exchanger for the bath circulation pump An electric water heater comprising a bypass path for bypassing a feed heat exchanger on the side, and a three-way valve for switching a bath circulation path between the bypass path side and the feed heat exchanger side. A mixing valve connected to a water supply pipe connected to a water supply port at a lower portion of the tank and a hot water outlet at an upper portion of the tank to mix hot water and water to supply hot water; and a tapping temperature sensor for detecting a mixed hot water temperature on a secondary side of the mixing valve. And a bath water supply pipe connecting the secondary side of the mixing valve and the bath circulation path or the bypass path, and a bath water supply valve interposed in the bath water supply pipe. When the bath water is supplied, the three-way valve is connected to the bypass path side. 2. The electric water heater according to claim 1, wherein the hot water supply pipe is connected to a predetermined position of a bath circulation water passage or a bypass passage which does not pass through the heat exchanger at the time of hot water supply. When the pressure becomes lower than a predetermined pressure, a rimping device is opened on the secondary side of the bath water supply valve of the bath water supply pipe to open the atmosphere and prevent the bath water from flowing back to the water supply pipe. A water level sensor that detects the bathtub water level is installed.When the bathtub water level is detected, the three-way valve is switched to a closed position that does not communicate with either the bypass path or the feed heat exchanger, and the hot water supply pipe is connected to the bypass path or the feed heat. 3. The electric water heater according to claim 2, wherein the water heater is connected to a bath circuit opposite to the three-way valve with respect to the exchanger. The three-way valve is configured so that it communicates with both the bypass path side and the flush heat exchanger side at an intermediate position.At the start of flushing, the bath circulation pump is turned on, and the 3-way valve is flush with the bypass way side for a predetermined time. The electric water heater according to any one of claims 1 to 3, wherein the stop is connected to both at an intermediate position on the side, and then the drive is switched to the drive-out heat exchanger side for drive-out.

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