JP4673651B2 - Hot water supply device - Google Patents

Description

  The present invention relates to a hot water supply device that heats cold water to produce hot water, stores the hot water in a water storage tank, and supplies the hot water.

As the above hot water supply devices, those using midnight power are widespread, but in recent years, those using a fuel cell system, a cogeneration system, a heating device type, etc. as a heat source have been proposed or marketed. ing. In these systems, hot water stored in water is added with cold water to an appropriate temperature, and hot water is supplied to necessary places in the home.
In addition, there is known a so-called reheating function in which hot water in a bathtub in a bathroom is led to a water storage tank and heat is exchanged. The heat exchange is performed by providing a pipe line in the water storage tank and introducing bath water into the pipe line.

JP 7-328340 A JP 2002-22389 A

However, in the case of the above-described conventional configuration, various dirt and calcium contained in the bath water or oil and fat content from the human body, etc. in the pipe for guiding the bath water to the water storage tank and the heat exchange pipe in the water storage tank, etc. There is a problem that the impurities adhere. In particular, a pipe for exchanging heat is usually formed inside the heat exchanger. If impurities adhere to the pipe, there is a problem that heat conduction is hindered and heat exchange efficiency is remarkably lowered. The inside of the heat exchanger is difficult to clean, and a decrease in heat exchange efficiency due to the adhesion of impurities has been a major problem. In addition, there is a problem that bacteria grow inside the heat exchanger, and as a result, odors and dirt flow into the bath water.
In addition, even if reheating is possible, the only way to lower the temperature of the bath water is to add cold water or wait for heat dissipation, which causes a heat loss in the thermal energy circulation of the entire hot water supply system. was there.
The object of the present invention is to solve the problems of the prior art.

In order to achieve the above object, a hot water supply apparatus of the present invention includes a cold water tank for storing cold water, introducing cold water in the cold water tank, heating the cold water to generate hot water , and selectively storing hot water. A heating device capable of introducing water in the tank and reheating the water in the hot water storage tank, a hot water storage tank for introducing and storing hot water heated by the heating device, and cold water in the heating device A switching valve for selectively connecting a tank and a hot water storage tank, a bathtub for storing bath water, and a hot water stored in the hot water tank and the bath water connected to the bathtub and exchanging heat; A first heat exchange means for heating the water, a first circulation line for circulating bath water between the bathtub and the first heat exchange means, and a cold water and bath in the cold water tank connected to the bathtub. A second heat exchange means for exchanging heat with water and cooling the bath water; A second circulation line for circulating bath water between the first heat exchange means and the second heat exchange means; a switching device for selectively connecting the first circulation line or the second circulation line to the bathtub; And a cleaning device for purifying and / or sterilizing the bath water circulating through the first and / or second circulation pipes.
According to the above configuration, the first heat exchanging means can catch up, and the second heat exchanging means can cool the bath water. In addition, since the hot water storage tank and the cold water tank are separated from each other and the first heat exchange means and the second heat exchange means are provided respectively, reliable temperature rise and cooling can be achieved. Moreover, since the heat by cooling in the cold water tank raises the temperature of the cold water, the loss of thermal energy can be suppressed by heating the raised cold water. In addition, a switching valve for selectively connecting a cold water tank and a hot water storage tank is provided in the heating device, so that the water in the hot water storage tank can be selectively introduced in the heating device, and the water in the hot water storage tank can be reheated. Therefore, it is possible to more reliably maintain the hot water storage tank at a high temperature. Therefore, it is possible to maintain a high hot water supply capacity and to maintain a high effect of replenishing the bath water.
In addition, since the cleaning device purifies impurities contained in the water circulating in the heat exchanger and the circulation line, the impurities are less likely to adhere inside the heat exchanger and the line, and good heat conduction is maintained. it can. Moreover, since washing and sterilization are performed, the growth of bacteria is suppressed, and the discharge of odor and dirt into the bath water is eliminated.
In addition, in the invention of claim 2, in addition to the above configuration, a temperature setting means for setting a desired bath water temperature is compared with the set temperature and the bath water temperature, and the comparison result is determined. Since the control device for controlling the switching device to connect the first circulation pipe or the second circulation pipe to the bathtub is provided, there is an effect that the bath water can be automatically recharged and cooled. .
Further, in the invention of claim 3, the bathtub has a water outlet for discharging the bath water and a water inlet for receiving the bath water, and the first heat exchanging means is connected to the water outlet and the water inlet. A short-circuit device that can short-circuit the water outlet side and the water inlet side of the bathtub at a desired time, and the short-circuit device short-circuits the water outlet side and the water inlet side of the bathtub. Since the heat exchange means and the circulation line are heated and the bath water is circulated, the heat exchange means and the washing device for washing and sterilizing the circulation line are provided. In order to perform cleaning and sterilization by short-circuiting the pipe line and circulating it through the heat exchange means and the circulation pipe while heating the bath water by the heat exchange means, the impurities adhering to the inside of the heat exchanger and the pipe line are washed. And good heat conduction can be maintained.
It should be noted that the cleaning with the circulation of the bath water only between the bathtub and the cleaning device without performing the heat exchange with the hot water or the cold water without interrupting the circulation with the first heat exchange means or the second heat exchange means. It is also possible to provide a conversion mode.

According to the hot water supply device of the present invention, it is possible to carry out while suppressing reliably and heat loss Reheating and cooling the bath water, also can maintain the cleanliness of the pipe, the efficiency of the heat exchanger There is an effect that can be maintained.

Embodiments of the present invention will be described below with reference to the drawings.
In FIG. 1, hot water generated by a heating device 50 as hot water supply means is stored in a hot water storage tank 51.
Cold water introduced from the water supply pipe 63 via the pressure reducing valve 62 is stored in the cold water tank 13, and is placed in the heating device 50 by the pump 60 via the switching valve 17 connected to the normal cold water tank 13 side. Here, the hot water is introduced from the top of the hot water storage tank 51 to the upper part of the hot water storage tank 51 and stored therein. The switching valve 17 switches to the hot water storage tank 51 side when the hot water temperature in the hot water storage tank 51 becomes a predetermined value or less, and reheats the hot water in the hot water storage tank 51.

  The hot water in the hot water storage tank 51 is mixed with cold water from the water supply pipe 63 in the mixing valve 61, cooled to a predetermined temperature, and then supplied to a predetermined location by the hot water supply pipe 64.

  A first heat exchanger 1 is provided in the hot water storage tank 51. The heat exchanger 1 includes a pipe line 10 that is bent several times, and is configured to raise the temperature of water inside the pipe line 10 while meandering the inside of the hot water storage tank 51.

  The heat exchanger 1 is connected to the water inlet 53 and the water outlet 54 of the bathtub 52 through circulation paths 2 and 2 ′, introduces bath water from the bathtub 52, rises in temperature, and returns to the bathtub 52 again. .

  A heat exchange switching valve 15 is provided in the vicinity of the heat exchanger 1 in the circulation paths 2 and 2 ′, and selectively connected to the second heat exchanger 11 via the branch circulation paths 16 and 16 ′. is doing. The heat exchanger 11 has a pipe line 12 provided in the cold water tank 13. The bath water is passed through the pipe line 12 to exchange heat with the cold water in the cold water tank 13 to cool the bath water. It is configured.

  A cleaning device 3 is provided in the middle of the circulation paths 2, 2 ′, and is configured to clean water circulating therethrough. The cleaning device 3 includes a pump 30, and sends water from the circulation path 2 ′ to the pipe line 10 through the switching valve 31, and returns to the bathtub 52 through the circulation path 2 and the cleaning device 3. It has become.

A UV lamp 33, a filtration tank 34, and an electrolytic sterilization device 35 are provided in the middle of the circulation path 2. The bath water is sterilized by the UV lamp 33, filtered by the filtration tank 34, and sterilized again by the electrolytic sterilization device 35. The water inlet 53 is configured to return into the bathtub 52.
A drain pipe 37 is provided on the outlet side of the filtration tank 34, and bath water can be discharged out of the system by operating the drain valve 36.

A short-circuit device comprising a short- circuit valve 40 and a short-circuit line 41 is provided on the side of the tub 52 of the circulation path 2 and the circulation path 2 ′, that is, in the vicinity of the water inlet 53 and the water outlet 54. 'Is short-circuited so that the bath water can be circulated without returning to the bathtub 52.

As described above, the short-circuit device is provided with the short-circuit valve 40 so that the short-circuit / non-short-circuit can be selected. That is, when the short-circuit valve 40 is switched, the short-circuit line 41 is conducted, and the circulation path 2 and the circulation path 2 ′ are short-circuited, the pump 30 and the switching valve 31 are passed through the circulation path 2 ′ to the pipeline 10. Here, a circuit is formed which is heated to a high temperature and passes from the circulation path 2 through the check valve 32, the UV lamp 33, the filtration tank 34 and the drain valve 36 and returns to the short-circuit valve 40 and the short-circuit line 41. By this circuit, the bath water circulates in the circulation path 2, the circulation path 2 ′ and the pipeline 10 of the heat exchanger 1 while being heated to a high temperature by the pipeline 10 of the heat exchanger 1, and cleans the inside. . After cleaning, the drain valve 36 is switched to the drain pipe 37 side to drain.

The above-described cleaning of the inside of the pipe line is performed by the control device 5. That is, the control device 5 controls the entire device shown in FIG. 1, and is particularly configured to open / close the switching valve 31, the drain valve 36, the short-circuit valve 40, and drive control of the pump 30 and the pump 60. At the time of cleaning, the short-circuit valve 40 is opened to the short-circuit device side, the short-circuit line 41 is conducted, the pump 30 is driven for a predetermined time, high-temperature bath water is circulated, and the drain valve 36 is switched after a predetermined time. Circulating water that has been cleaned from the drain pipe 37 is discharged out of the system to complete the cleaning.
The connecting pipe 38 is a pipe that short-circuits the UV lamp 33 and the switching valve 31 and is used in the bath water purification mode.

  The controller 5 is provided with a hot water temperature setting device 6, and is configured to maintain the temperature of the bath water detected by the hot water temperature sensor 7 at the temperature set by the hot water temperature setting device 6. In other words, the switching valve 31 and the heat exchange switching valve 15 are controlled by temperature, and the bath water is selectively operated in three modes: heating (chasing), cooling, and sterilization purification.

  In the case of heating, the switching valve 31 is switched to the circulation path 2 'side, and the heat exchange switching valve 15 is switched to the heat exchanger 1 side. The bath water is supplied from the outlet 54 through the pump 30, the switching valve 31, the circulation path 2 ', the heat exchange switching valve 15, the pipe 10, the heat exchange switching valve 15, the circulation path 2, the check valve 32, the UV lamp 33, and the filtration. It circulates in the route of the tank 34, the drain valve 36, the short circuit valve 40, and the water inlet 53, and heats by the pipe line 10 of the heat exchanger 1.

  In the case of cooling, the heat exchange switching valve 15 is switched to the branch circulation path 16, 16 'side, and the bath water is supplied from the outlet 54 to the pump 30, the switching valve 31, the circulation path 2', the heat exchange switching valve 15, the branch circulation. The heat exchanger is made to circulate through the route of the path 16 ', the pipe 12, the branch circuit 16, the circuit 2, the check valve 32, the UV lamp 33, the filtration tank 34, the drain valve 36, the short-circuit valve 40, and the water inlet 53. Cooling of the bath water is performed by 11 pipe lines 12.

  In the case of circulation, the switching valve 31 is switched to the UV lamp 33 side, and the bath water is supplied from the outlet 54 to the pump 30, the switching valve 31, the connecting pipe 38, the UV lamp 33, the filtration tank 34, the drain valve 36, and the short-circuit valve. 40, it is made to circulate through the route of the water inlet 53, and the purification | cleaning and disinfection of the bath water by the UV lamp 33, the filtration tank 34, and the electrolytic sterilization apparatus 35 are performed.

Next, the operation will be described based on the flowchart of FIG .
It is checked whether or not it is in the hot water supply mode (step S1), and in the hot water supply mode, the process jumps to the hot water supply subroutine (step S10). The hot water temperature is set and stored (steps S2 and S3), and it is checked whether or not it is finished (step S4). When thermal sterilization is instructed (step S5), thermal sterilization is executed (step S20).

  If it is not thermal sterilization, the temperature of the bath water in the bathtub 52 from the hot water temperature sensor 7 is detected (step S6) and compared with the stored set temperature (step S7). If the temperature is within the set temperature, the sterilization purification mode is operated (step S30). When the temperature is lower than the set temperature (step S8), the operation in the temperature raising mode is performed (step S40). When the temperature is higher than the set temperature, the operation in the cooling mode is performed (step S50).

The subroutine of heat sterilization step 20 will be described with reference to FIG.
The heat exchange switching valve 15 is switched to the heat exchanger 1 side (step S21), and the drain valve 36 is set to the short-circuit valve 40 side (step S22). Further, the control device 5 switches the short-circuit valve 40 to the short-circuit line 41 side and short-circuits the circulation paths 2 and 2 ′ in front of the bathtub 52, that is, short-circuits the water inlet 53 and the water outlet 54, and the circulation path 2 ′. Then, a closed loop of the pipe line 10 and the circulation path 2 is formed (step S23). In this state, the pump 30 is driven, the switching valve 31, the circulation path 2 ′, the pipeline 10, the circulation path 2, the check valve 32, the UV lamp 33, the filtration tank 34, the drain valve 36, the short-circuit valve 40, and the short-circuit pipe. Water is circulated in a circuit called path 41. During this time, since the circulating water is heated to a high temperature in the pipe 10, the insides of the pipe 10, the circulation path 2, and the circulation path 2 'are washed at a high temperature.
In addition, it is sterilized by the UV lamp 33, filtered by the filtration tank 34, and further sterilized by the electrolytic sterilizer 35, so that the cleaning effect is further increased.
After washing for a predetermined time (step S24), the control device 5 opens the drain valve 36 toward the drain pipe 37 (step S25), and discharges the circulating water used for washing out of the system from the drain pipe 37. After a predetermined time has elapsed (step S26), the drain valve 36 is returned to the short-circuit valve 40 side (step S27).
By the above, the inside of the pipe line 10, the circulation path 2, and the circulation path 2 ′ of the heat exchanger 1 can be effectively executed.

  Before draining, the heat exchange switching valve 15 is switched to the pipe 12 side, and the high-temperature circulating water is circulated through the pipe 12 to exchange heat with the cold water in the cold water tank 13, thereby recovering the heat of the high-temperature circulating water. It is also possible to perform.

Next will be described an operation of the disinfection purification mode by FIG.
The switching valve 31 is set on the connection pipe line 38 side (step S31), the drain valve 36 is set on the short circuit valve 40 side (step S32), and the short circuit valve 40 is set on the water inlet 53 side (step S33). If the pump 30 is driven in this state, the bath water circulates from the water outlet 54 to the pump 30, the switching valve 31, the connecting pipe 38, the UV lamp 33, the filtration tank 34, the drain valve 36, the short-circuit valve 40, and the water inlet 53. The bath water can be circulated while being sterilized and filtered in the UV lamp 33, the filtration tank 34, and the electrolytic sterilizer 35. When the detected temperature of the hot water temperature sensor 7 is outside the set temperature (step S34), the process returns to step S4. Moreover, also when this routine is complete | finished (step S35), it returns to step S4.

Next, the operation in the temperature raising mode (chase) in step S40 will be described with reference to FIG .
The switching valve 31 is set on the circulation path 2 ′ side (step S41), and the heat exchange switching valve 15 is set on the heat exchanger 1 side (step S42). And the short circuit valve 40 is switched to the water inlet 53 side (step S43).
The bath water in the bathtub 52 passes through the pump 30 from the outlet 54, passes through the switching valve 31 and enters the pipe line 10 of the heat exchanger 1 from the circulation path 2 ′, where it is heat-exchanged and heated to be the circulation path. 2 is passed through the cleaning device 3 and returned to the bathtub 52, where the temperature is raised and retreated.
In the cleaning device 3, the bath water is sterilized and filtered by the UV lamp 33, the filtration tank 34, and the electrolytic sterilization device 35, so that impurities are present in the pipe 10 of the heat exchanger 1 and in the circulation paths 2 and 2 ′. Is prevented from adhering. Therefore, there is an effect that the heat exchange effect of the heat exchanger 1 can be maintained.
When the bath water temperature by the hot water temperature sensor 7 is outside the set range (step S44), the process returns to step S4.

Next, the operation in the cooling mode in step S50 will be described with reference to FIG .
The switching valve 31 is set on the circulation path 2 ′ side (step S51), and the heat exchange switching valve 15 is set on the heat exchanger 11 side (step S52). And the short circuit valve 40 is switched to the water inlet 53 side (step S53). The bath water in the bathtub 52 passes through the pump 30 from the outlet 54, passes through the switching valve 31, enters the pipe 12 of the heat exchanger 11 from the circulation path 2 ', is heat-exchanged and cooled here, and is cooled. Is passed through the cleaning device 3 and returned to the bathtub 52 to cool the bath water.
In the cleaning device 3, the bath water is sterilized and filtered by the UV lamp 33, the filtration tank 34, and the electrolytic sterilization device 35. Therefore, impurities are present in the pipe 12 of the heat exchanger 11 and in the circulation paths 2 and 2 ′. Is prevented from adhering. Therefore, there is an effect that the heat exchange effect of the heat exchanger 11 can be maintained.
When the bath water temperature by the hot water temperature sensor 7 is outside the set range (step S54), the process returns to step S4.

  In the above cooling mode, cooling can be performed without adding water to the bath water. Moreover, since the cold water in the cold water tank 13 is sent to the heat pump 50 to be heated and used as hot water, the heat absorption from the bath water can be reused as hot water, heat recovery is performed, and energy efficiency is improved. Can be planned.

Explanatory drawing which shows one Embodiment of this invention. The flowchart figure explaining operation | movement of one Embodiment of this invention. The flowchart figure explaining operation | movement of one Embodiment of this invention. The flowchart figure explaining operation | movement of one Embodiment of this invention. The flowchart figure explaining operation | movement of one Embodiment of this invention. The flowchart figure explaining operation | movement of one Embodiment of this invention.

1: heat exchanger, 2, 2 ′: circuit, 3: cleaning device, 5: control device, 6: hot water temperature setting device, 7: hot water temperature sensor, 10: pipe, 11: heat exchanger, 12 : Pipe line, 13: Cold water tank, 15: Heat exchange switching valve, 16: Branch circuit, 17: Switching valve, 30: Pump, 31: Switching valve, 32: Check valve, 33: UV lamp, 34: Filtration Tank: 35: Electrolytic sterilizer, 36: Drain valve, 37: Drain pipe, 38: Connecting pipe, 40: Short-circuit valve, 41: Short-circuit pipe, 50: Heating device, 51: Hot water storage tank, 52: Bathtub, 53 : Water inlet, 54: water outlet, 60: pump, 61: mixing valve, 62: pressure reducing valve, 63: water supply pipe, 64: hot water supply pipe.

Claims (4)

A cold water tank for storing cold water;
Heat that introduces cold water in the cold water tank, heats the cold water to generate hot water, can selectively introduce water in the hot water storage tank, and can reheat the water in the hot water storage tank Equipment,
A hot water storage tank for introducing and storing hot water heated by the heating device;
A switching valve for selectively connecting a cold water tank and a hot water storage tank to the heating device;
A bathtub for storing bath water,
A first heat exchanging means connected to the bathtub and performing heat exchange between the hot water stored in the hot water storage tank and the bath water to heat the bath water;
A first circulation line for circulating bath water between the bathtub and the first heat exchange means;
A second heat exchanging means connected to the bathtub, exchanging heat between the cold water and the bath water in the cold water tank, and cooling the bath water;
A second circulation line for circulating bath water between the bathtub and the second heat exchange means;
A switching device for selectively connecting the first circulation line or the second circulation line to the bathtub;
A cleaning device for purifying and / or sterilizing the bath water circulating through the first and / or second circulation lines;
A hot water supply device comprising: A cold water tank for storing cold water;
Heat that introduces cold water in the cold water tank, heats the cold water to generate hot water, can selectively introduce water in the hot water storage tank, and can reheat the water in the hot water storage tank Equipment,
A hot water storage tank for introducing and storing hot water heated by the heating device;
A switching valve for selectively connecting a cold water tank and a hot water storage tank to the heating device;
A bathtub for storing bath water,
A first heat exchanging means connected to the bathtub and performing heat exchange between the hot water stored in the hot water storage tank and the bath water to heat the bath water;
A first circulation line for circulating bath water between the bathtub and the first heat exchange means;
A second heat exchanging means connected to the bathtub, exchanging heat between the cold water and the bath water in the cold water tank, and cooling the bath water;
A second circulation line for circulating bath water between the bathtub and the second heat exchange means;
A switching device for selectively connecting the first circulation line or the second circulation line to the bathtub;
A cleaning device for purifying and / or sterilizing the bath water circulating through the first and / or second circulation lines;
Temperature setting means for setting a desired bath water temperature;
A control device that compares the set temperature with the bath water temperature, controls the switching device according to the comparison result, and connects the first circulation pipe or the second circulation pipe to the bathtub. When,
A hot water supply device comprising: The bathtub has a water outlet for discharging the bath water and a water inlet for receiving the bath water;
The first heat exchanging means is connected to the water outlet and the water inlet;
A short-circuit device capable of short-circuiting the water outlet side and the water inlet side of the bathtub at a desired time;
Short-circuiting the water outlet side and the water inlet side of the bathtub by the short-circuit device, and circulating the bath water through the heat exchange means and the circulation line while heating the bath water by the heat exchange means, the heat exchange means And a cleaning device for cleaning and sterilizing the circulation line,
The hot-water supply apparatus of Claim 1 or 2 provided with these. A cleaning mode in which the circulation of the bath water is performed only between the bathtub and the cleaning device without the heat exchange with the hot water or the cold water without the circulation with the first heat exchange means or the second heat exchange means. ,
The hot water supply device according to claim 1, 2 or 3.

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