JP2003207209A - Hot water storage-type electric water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cope with both of additional heating of the water in a bathtub and an apparatus utilizing the hot water such as a floor heater, by sharing a heat exchange part of a warming circulating pipe for heat exchange with the hot water in a hot water tank of an electric water heater, and properly switching the flow of the circulated water in the warming circulating pipe by a channel switching means. <P>SOLUTION: In a case where the hot water in the bathtub 23 is additionally heated because it is cooled down, a first channel switching means 30 and a second channel switching means 33 are opened to circulate the hot water in the bathtub 23 by a pump 31, and the heat obtained by heat exchanging with the hot water in the hot water tank 1 is heat exchanged with the water in the bathtub by a heat exchanging part 27, to additionally heat the water in the bathtub. In a case where the apparatus utilizing the hot water 34 is heated, a third channel switching means 37 and a fourth channel switching means 41 are opened at a hot water circulating pipe side 35, and the apparatus utilizing the hot water 34 is heated by the heat obtained by circulating the circulated water by the pump 31 to be heat exchanged with the hot water in the hot water tank 1. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION [0001] The present invention relates to additional heating of hot water in a bathtub and heat to equipment utilizing hot water by the heat of circulating water in a heating and circulating pipe which has been heat-exchanged with hot water in a hot water tank. The present invention relates to a hot water storage type electric water heater capable of supplying water. 2. Description of the Related Art Conventionally, for example, Japanese Patent Application Laid-Open No. 2001-108292
As described in the publication, a circulation circuit for circulating hot water taken out from the upper part of the hot water tank to a lower part of the hot water tank by a circulation pump is provided, and the hot water and the bath water taken out of the hot water tank are heated in the circulation circuit. 2. Description of the Related Art A hot water storage type electric water heater which is replaced and heated by reheating is known. On the other hand, for example, in Japanese Patent No. 2564179, water in a hot water supply tank (hot water storage tank) of an electric water heater is energized by using a midnight electric power to boil the water by heating an exothermic tube, and the heat and one end of the heated hot water are heated. A heat exchange section for heat exchange, a floor heating section is formed at the other end, and a heat transfer medium such as fresh water is formed as a circulation circuit (hot water circulation pipe) to be fed by a circulation pump. 2. Description of the Related Art A hot-water floor heating device that heats a floor by radiating heat from a floor heating unit is known. [0003] However, the electric water heater described in Japanese Patent Application Laid-Open No. 2001-108292 uses the heat of the circulation circuit obtained by heat-exchanging hot water in a hot water storage tank. The electric water heater described in the above-mentioned Japanese Patent No. 2564179 has only a function to be used for a floor heater, and has the function of exchanging heat between hot and cold water in a hot water tank. However, it could not cope with any of the heating functions such as reheating of bath water and floor heaters. [0004] The present invention has been made in view of such a point, and shares a heat exchanging section for exchanging heat with hot water in a hot water storage tank of an electric water heater, and directs a flow of circulating water in a circulation circuit to a flow path. An object of the present invention is to provide a hot-water storage type electric water heater that can be appropriately switched by a switching means and can cope with any of hot water utilization equipment such as additional heating of a bathtub and a floor heater. [0005] The hot water storage type electric water heater according to the first aspect of the present invention has a hot water storage tank having a hot water supply pipe which is supplied with water from a lower part and is supplied with water from an upper part, and a high water supply in the hot water storage tank. A heating means for boiling to a temperature, a heating circulation pipe having a circulation pump connected at one end to a heat exchange unit provided in the hot water storage tank and connected to the other end of the bath tank to circulate circulating water, A first flow path switching means provided in an outgoing pipe of the heating circulation pipe; a second flow path switching means provided in a return pipe of the heating circulation pipe; A hot water circulating pipe connected to a hot water utilization device in which circulating water is circulated and connected in parallel so as to share the exchange unit; a third flow path switching means provided in an outgoing pipe of the hot water circulating pipe; A fourth flow path switching means provided on the return pipe of the hot water circulation pipe; It is provided. [0006] With this configuration, the heat exchange part of the heating circulation pipe that exchanges heat with the hot water of the hot water storage tank is shared, and the first to fourth flow path switching means are appropriately switched. It can perform additional heating of hot water in the bathtub and heating of hot water utilization equipment. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a hot water storage type electric water heater.
Is a hot water storage tank, which is connected to a water supply pipe 3 having a pressure reducing valve 2 at a lower part and a hot water supply pipe 4 at an upper part.
Is connected. The hot water tank 1 is provided with a heating means 5 for boiling water in the hot water tank 1 to a high temperature. The heating means 5 includes a compressor 6, a four-way valve 7, a condenser 8 as a heat exchanger, an expansion valve 9 for reducing pressure, a blower fan 10 for promoting heat collection, and a drive fan for the blower fan 10. The heat pump type heat collector 13 circulates the refrigerant in a closed circuit in which the evaporator 12 having the motor 11 is connected in series with the evaporator 12, and the circulation pump 14 circulates the water in the hot water storage tank 1. And a circulation pipe 15 for circulating water from the lower part of the hot water storage tank 1 to the upper part of the hot water storage tank 1 to heat the water in the hot water storage tank 1 by heat exchange with the condenser 8. The hot water supply pipes 4 are each branched, have a mixing valve 16 and a temperature sensor 17, and are provided in the kitchen sink 1.
Hot water supply pipe 19 connected to mixing valve 20 and mixing valve 20
And a hot water pipe 22 having a temperature sensor 21 is connected to a bathtub 23. Reference numeral 24 denotes a water supply branch pipe. The water supply branch pipe 24 branches to the water supply pipe 3 and is connected to the mixing valve 1.
Mixing tap water is supplied to 6 and 20, respectively. A cold water pipe 25 for supplying cold water is connected to the kitchen sink 18. Reference numeral 26 denotes a heating circulation pipe. The heating circulation pipe 26 circulates circulating water therein, and is connected to the bath tub 23 and the heat exchange unit 27 disposed in the front hot water storage tank 1, respectively. A first flow path switching means 30 is connected to the bathtub 23 side, and a circulation pump 31 and a heating sensor 32 are provided in the outflow pipe 28. ing. The return pipe is provided with a second flow path switching means 33 on the way. Numeral 34 denotes a hot water circulating pipe, which is arranged in parallel with the heating circulating pipe 26.
5 are connected. The forward pipe 36 of the hot water circulation pipe 35 is provided with a third flow path switching means 37, a mixing valve 38, and a joint 39 connected to a hot water utilization device 34 as appropriate, and a return pipe 40 is provided with a fourth
And a joint 43 are connected to each other. A branch pipe 44 branches from the return pipe 40 and is connected to the mixing valve 39. Reference numeral 45 denotes an auxiliary heater for boiling water in the hot water storage tank. The auxiliary heater 45 is energized when the heat-pump type heat collector 13 cannot obtain sufficient heat.
The hot water utilization equipment is, for example, a floor heater, a panel heater, a clothes dryer, a snow melting equipment, and the like. Reference numeral 46 denotes a control device as operation control means. The control device 47 receives detection signals from the temperature sensor 17, the temperature sensor 21, the heating sensor 32, and the like. Further, the compressor 6, the driving motor 11, the circulation pump 14, the mixing valve 16,
The driving of the mixing valve 20, the pump 31, the mixing valve 39, the first flow path switching means 30 to the fourth flow path switching means 41, and the like is controlled. Next, the operation of this embodiment will be described. First, the operation of boiling water in the hot water storage tank 1 will be described with reference to FIG. Tap water is stored in the hot water tank 1 from the water supply pipe 3. The control unit 46 controls the compressor 5
Is driven. As a result, as indicated by a two-dot chain line arrow,
The refrigerant flows through the compressor 6, the four-way valve 7, the condenser 8, the expansion valve 9, and the evaporator 12 in this order. The refrigerant that has collected atmospheric heat in the evaporator 12 and vaporized is sent to the compressor 6, and the high-temperature and high-pressure refrigerant gas that has been compressed by the compressor 6 and exits therethrough in the circulation pipe 15 in the condenser 8.
Heat exchange with the water inside. On the other hand, the circulating pump 14 of the circulating pipe 15 is driven, and the water in the lower part of the hot water storage tank 1 is exchanged with the water in the circulating pipe 15 by the condenser 8 as shown by the solid arrow, and the hot water and the hot water are exchanged as shown by the dotted arrow. Then, the hot water at the set temperature of about 90 ° C. is sequentially laminated from the upper portion of the hot water storage tank 1 and the water in the entire hot water storage tank 1 is heated. Next, the operation of supplying hot water in the heated hot water storage tank 1 will be described with reference to FIG. The control device 46 controls the mixing valve 16.
The hot water supply electromagnetic valve (not shown) is opened at the set temperature, and the hot water of the hot water supply pipe 4 and the tap water of the water supply branch pipe 24 are mixed and supplied to the sink 18 through the hot water supply pipe 19. Further, the hot water supply solenoid valve (not shown) is adjusted by adjusting the set temperature of the mixing valve 20, the hot water of the hot water supply pipe 4 is mixed with the tap water of the water supply branch pipe 24, the first flow path switching valve 31 is opened, and the hot water supply pipe is opened. 22
The bathtub 23 is filled with hot water. Also, the temperature sensor 1
Monitor the drop in hot water temperature by 6 and 20. In this case,
The second to fourth flow path switching valves 33 to 41 are closed. Next, the additional heating operation when the water in the bathtub is cooled will be described with reference to FIG. When the hot water in the bathtub 23 is cooled by bathing for a long time or the like, the heating sensor 32 operates, and this signal is input to the controller 46. The control device 46 operates in response to the signal from the hot water temperature sensor 32, whereby the first flow path switching means 30 and the second flow path switching means 33 are opened. Then, the pump 31 is driven, and the hot and cold water in the bathtub 23 is circulated in the heating circulation pipe 26 as shown by the dotted arrow, and heat exchanged with the hot and cold water in the hot water storage tank in the heat exchange unit 27. The heat is then exchanged for additional cooking and heating. In this case, the third flow path switching valve 37 and the fourth flow path switching valve 41 are closed. Next, a description will be given of the operation when the heated hot water in the hot water storage tank 1 is used, for example, for a floor heater as a hot water utilization device with reference to FIG. The third flow path switching means 3 is controlled by the control device 46.
The seventh and fourth flow path switching means 41 are opened. Since the hot and cold water in the heating circulation pipe 26 is cooled, the heating sensor 32
Operates, and this signal is input to the controller 46. Then, the pump 31 is driven, and the cooled hot water in the hot water circulation pipe 35 is circulated in the hot water circulation pipe 35 as indicated by a dotted arrow, and heat-exchanged with the hot water in the hot water storage tank 1 in the heat exchange unit 27. Heat is exchanged by the generated heat, and the floor heater is heated. The heat is radiated from the floor radiator to the room, and the room is heated. The circulating water cooled by the heat of the floor heater enters the mixing valve 38 via the branch pipe 44 and is mixed with the high-temperature circulating water heat-exchanged in the heat exchange unit 27 to obtain the circulating water having an appropriate temperature and radiate the floor heat. And sent to the room for heating the room. In this case,
The first flow path switching valve 30 and the second flow path switching valve 33 are closed. Although the means for heating the water 5 in the hot water storage tank 1 is described as performing heat exchange between the heat pump type collector 13 and the water in the circulation pipe 15, the present invention is not limited to this. The heating may be performed by an auxiliary heater 45 provided in the hot water storage tank 1. According to the hot water storage type electric water heater according to the first aspect, the heat exchange section of the heating circulation pipe which exchanges heat with the hot water in the hot water storage tank of the electric water heater is used for heating. By appropriately switching the flow of circulating water in the circulation pipe by the flow path switching means,
It can be used for any equipment that uses hot water such as reheating of bath water or floor heaters.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram illustrating a configuration of a hot water storage type electric water heater according to an embodiment of the present invention. FIG. 2 is an explanatory diagram illustrating a hot water supply operation of the hot water storage type electric water heater. FIG. 3 is an explanatory diagram illustrating a case where a hot water storage type electric water heater is used for additional heating of a bathtub. FIG. 4 is an explanatory view illustrating a case where the hot water storage type electric water heater is used for heating a floor heater. DESCRIPTION OF THE SYMBOLS 1 Hot water storage tank 4 Hot water supply pipe 21 First flow path switching means 22 Hot water pipe 23 Bath tub 26 Heating circulation pipe 27 Heat exchange unit 27 Outgoing pipe 28 Return pipe 29 Pump 30 First flow path switching means 33 Second flow path switching means 34 Hot water utilization equipment 35 Hot water circulation pipe 36 Outgoing pipe 37 Third flow path switching means 40 Return pipe 41 Fourth flow path switching means

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Eiichi Machida             180 Furuichi-cho, Maebashi-shi, Gunma Toshiba Equipment Co., Ltd.             In the formula company F term (reference) 3L024 DD03 DD04 DD05 DD14 DD17                       DD21 DD27 GG01 HH31                 3L025 AC01

Claims (1)

Claims: 1. A hot water storage tank having a hot water supply pipe supplied with water from a lower part and supplied with water from an upper part, heating means for boiling water in the hot water storage tank to a high temperature, and one end of the hot water storage tank A heating circulation pipe having a circulation pump connected to the heat exchange unit provided therein and having the other end connected to the bathtub and circulating circulating water, and a heating circulation pipe provided on the outflow pipe of the heating circulation pipe. A first flow path switching means, a second flow path switching means provided on a return pipe of the heating circulation pipe, and a circulation connected in parallel with the heating circulation pipe so as to share the heat exchange unit. A hot water circulation pipe to which a hot water utilization device through which water circulates is connected, and third flow path switching means provided on an outgoing pipe of the hot water circulation pipe;
And a fourth flow path switching means provided on a return pipe of the hot water circulation pipe.