JP2012083059A - Hot water supply apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water supply apparatus which can sufficiently secure the supply amount of hot water to hot water supply and hot water filling even when performing simultaneous use of hot-water supply and hot water filling.SOLUTION: The hot water supply apparatus includes: a conveyance switching means 27 which performs switching between single conveyance of performing hot water filling through a hot water filling pipe 37 from one side of a bath circulation circuit and dual conveyance of performing hot water filling through the hot water filling pipe 37 from both sides of the bath circulation circuit; and a hot water supply control part 49 which controls the switching of the conveyance switching means 27. In the hot water supply apparatus, the hot water supply control part 49 controls the conveyance switching means 27 so that when there is a request of hot water filling during hot water supply, the hot water filling is performed by the single conveyance and when there is a request of hot water supply during hot water filling, switching from dual conveyance to single conveyance is performed and when the hot water supply is completed, the switching to the dual conveyance is performed, and accordingly, preferable hot water supply and hot water filling can be performed and further, in the dual conveyance of only the hot water filling, the hot water filling can be ended in a short period of time and highly efficient operation can be performed.

Description

  The present invention relates to a hot water supply apparatus that switches the form of hot water filling to a bathtub according to the presence or absence of simultaneous use with hot water supply.

Conventionally, with this type, it is possible to perform good hot water filling without loss of heat dissipation and waste of time and efficiency by switching between both transport and single transport according to the hot water temperature. It was. (For example, refer to Patent Document 1.)
JP 2009-210203 A

By the way, in this conventional thing, hot water filling to a bathtub is performed efficiently, but when hot water supply is used by simultaneous use, it is said that hot water is used only for hot water filling in both transports and hot water supply cannot be used. A problem occurs, and the water supply pressure is set to 170 KPa using a high-pressure pressure reducing valve.
If you use the shower on the 3rd floor and the hot water filling to the bathtub on the 2nd floor, you can use both the shower on the 3rd floor and the transport to the bathtub on the 2nd floor at the same time. However, the shower flow on the 3rd floor was drastically reduced, and there was a problem that the feeling of use was extremely bad.

  This invention pays attention to this point, and in order to solve the above-mentioned problem, in particular, the structure is mixed with hot water from the hot water supply pipe and water supplied from the first branch water supply pipe branched from the water supply pipe, and used as hot water at the hot water supply set temperature. Hot water mixing valve that supplies hot water from the hot water tap, hot water from the branch hot water pipe branched from the hot water pipe, and hot water from the second branch water pipe branched from the hot water pipe are mixed, and the hot water pipe is used as bath water at the bath set temperature. A bath mixing valve for filling the bathtub through the bath, a transfer switching means for switching the hot water filling from the hot water filling pipe from one side of the bath circulation circuit to both conveyances performed from both sides, and this transfer switching means A hot water supply control unit for controlling the switching of the hot water supply, the hot water supply control unit fills the hot water by a single transfer when there is a hot water filling request during hot water supply, and there is no hot water supply during the hot water filling. Switch from both transports to single transport and the hot water supply is finished. Both conveyor controls the conveyance path switching means switches so.

  As described above, according to the present invention, when the hot water filling to the bathtub and the hot water supply are simultaneously used, the hot water filling is always switched to the single conveyance, and when the hot water supply is completed, the two hot water is returned to the two conveyances. Therefore, the hot water is divided into the hot water supply and the one-sided hot water filling almost uniformly without taking the hot water only in the hot water filling, and good hot water supply and hot water filling can be performed. The hot water filling can be completed in a short time, and an efficient operation can be performed.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the hot water supply apparatus of one Embodiment of this invention. The principal part block diagram of the same electric circuit. The flowchart of the principal part.

Next, an embodiment of the present invention will be described with reference to the drawings.
This hot water supply device boils and stores hot water during late-night hours when the unit price of contracted power by time is low, and uses the stored hot water for hot water supply. 1 includes a hot water storage tank 2 for storing hot water. A hot water storage tank unit, 3 is a heat pump unit as a heating means for heating hot water in the hot water storage tank 2, 4 is a hot water tap provided in a kitchen, a washroom, etc., and 5 is a hot water supply provided in the vicinity of the hot water tap 4 A remote control, 6 is a bathtub, and 7 is a bath remote control provided in the bathroom.

  The hot water storage tank 2 of the hot water storage tank unit 1 has a hot water discharge pipe 8 connected to the upper end, a water supply pipe 9 connected to the lower end, a heat pump forward pipe 10 constituting a heat pump circulation circuit in the lower part, and a heat pump circulation circuit in the upper part. To the heat pump return pipe 11, the hot water in the hot water storage tank 2 taken out from the heat pump forward pipe 10 is boiled by the heating means 3, returned to the hot water storage tank 2 from the heat pump return pipe 11, and stored in the hot water supply pipe 9. The hot water in the hot water storage tank 2 is pushed up by the water supply from the hot water, and the hot water in the upper part of the hot water storage tank 2 is pushed out from the hot water discharge pipe 8 to supply hot water. In the middle of the water supply pipe 9, there are provided a high-pressure pressure reducing valve 12 that raises the city water supply pressure from 170 KPa to 260 KPa, and a water supply temperature sensor 13 that detects the water supply temperature. A high-pressure overpressure relief valve 14 for releasing overpressure in the hot water storage tank 2 is provided.

  The heating means 3 includes a compressor 15, a refrigerant water heat exchanger 16 as a condenser, an electronic expansion valve 17, a forced air-cooled evaporator 18, and hot water in the hot water storage tank 2. A heat pump circulation pump 20 that circulates to the refrigerant water heat exchanger 16 via the heat pump forward pipe 10 and the heat pump return pipe 11 and a heat pump control unit 21 that controls the driving thereof are provided. Carbon dioxide is used as a supercritical heat pump cycle. Since carbon dioxide is used as the refrigerant, low-temperature water can be boiled up to a high temperature of about 90 ° C. without an electric heater.

  Reference numeral 22 denotes a bath heat exchanger made of a stainless steel tube for heating the hot water in the bathtub 6, and a bath return pipe 25 having a bath outlet pipe 23 and a bath circulation pump 24 is connected to the bath heat exchanger 22. Thus, the hot water in the bathtub 6 can be circulated, and the hot water in the bathtub 6 is heated by the high-temperature water in the hot water storage tank 2 to form a bath circulation circuit in which heat insulation or reheating is performed. It is a bath temperature sensor that detects the temperature of hot water in the bathtub 6 circulating through the bath return pipe 25.

  Reference numeral 27 denotes a transfer switching means comprising a three-way valve provided at a connection portion between the bath return pipe 25 and the bypass pipe 28 communicating the bath return pipe 23 and the bath return pipe 25 so as to bypass the bath heat exchanger 22. By closing only the valve 27a on the bath heat exchanger 22 side, hot water filling to the bathtub 6 is performed by both transports from both the bath return pipe 25 and the bath return pipe 25 via the bath return pipe 25 and the bypass pipe 28. Furthermore, when only the valve 27b on the bath return pipe 25 side is closed on the opposite side of the bath heat exchanger 22, the hot water does not flow to the bypass pipe 28 side, and only the bath return pipe 25 passes through the bathtub 6 In addition to this, the one-sided hot water filling is performed, and the two-sided transfer and the one-sided transfer are switched by this transfer switching means 27. Stored in bath heat exchanger 22 at start It is hot water heated to a high temperature is also intended to prevent the directly supplied to the tub 6 in the flow path switching utilizing the bypass tube 28.

Reference numeral 29 denotes a hot water mixing valve composed of an electric mixing valve that mixes hot water from the hot water discharge pipe 8 and low-temperature water from the first branch water supply pipe 30 branched from the water supply pipe 9, and is provided in the hot water supply pipe 31 downstream thereof. The mixing ratio is controlled so that the hot water temperature detected by the hot water supply temperature sensor 32 becomes the hot water supply set temperature set by the user using the hot water remote controller 5 or the bath remote controller 7.
A hot water flow sensor 33 provided in the middle of the hot water pipe 31 detects the generation of water flow caused by the hot water in the hot water pipe 31 and transmits an ON signal during the hot water supply.

  34 is a bath mixing valve composed of an electric mixing valve that mixes hot water from the branch hot water pipe 35 branched from the hot water pipe 8 and low temperature water from the second branch water supply pipe 36 branched from the water supply pipe 9. The hot water temperature detected by the hot water temperature sensor 38 provided in the hot water temperature tube 37 communicated with the downstream bath return pipe 25 becomes the bath set temperature set by the user with the hot water remote controller 5 or the bath remote controller 7. Thus, the mixing ratio is controlled.

The hot water filling pipe 37 has an opening / closing valve 39 for opening / closing the hot water filling to the bathtub 6, a hot water filling counter 40 for counting the amount of hot water filling to the bathtub 6, and hot water filling. A hot water flow sensor 41 for detecting the start / stop of the water flow based on the presence or absence of water flow and transmitting an ON signal during hot water filling, and a double hot water check valve 42 for preventing the reverse flow of bath water from the bathtub 6 Is provided.
43 is a water level sensor provided in the bath return pipe 25 for detecting the water level of the bathtub 6 and controlling the amount of filling with the filling counter 40.

  A plurality of hot water storage temperature sensors 44 are arranged in the vertical direction of the hot water storage tank 2. In this embodiment, five hot water storage temperature sensors are arranged and are called 44 a, 44 b, 44 c, 44 d, 44 e from the top. Is used to detect how much heat is left in the hot water storage tank 2 and to detect the temperature distribution in the vertical direction in the hot water storage tank 2.

  The hot water remote controller 5 and the bath remote controller 7 are respectively provided with a hot water supply temperature setting switch 45 for setting a hot water supply set temperature and a bath temperature setting switch 46 for setting a bath set temperature. The bath remote switch 7 is provided with an automatic bath switch 47 that fills the hot water by a hot water amount set by a hot water amount setting switch (not shown) of the bath remote control 7 and keeps it warm for a predetermined time. A hot water hot water switch 48 for pouring hot water is provided.

  Reference numeral 49 denotes a hot water supply control unit composed of a microcomputer that receives the input of each sensor in the hot water storage tank unit 1 and controls the driving of each actuator. The hot water supply remote control 5 and the bath remote control 7 are connected to the hot water supply control unit 49 by radio or wire. The user can set an arbitrary hot water supply set temperature and bath set temperature.

  The hot water supply control unit 49 feedback-controls the opening degree of the hot water supply mixing valve 29 so that the temperature detected by the hot water supply temperature sensor 32 becomes the hot water supply set temperature, and the temperature detected by the hot water temperature sensor 38. The valve opening degree of the bath mixing valve 34 is feedback-controlled so that becomes the bath set temperature.

  Further, the hot water supply control unit 49 has a hot water filling request for turning on the automatic bath switch 47 while the ON signal from the hot water supply flow sensor 33 is being input during hot water supply, and the hot water filling flow sensor 41 outputs an ON signal. Therefore, it is determined that the hot water supply and the hot water filling are used at the same time, and the transfer switching means 27 is closed with the valve 27b to make the hot water filling only by the single transfer of the bath return pipe 25. When the hot water tap 4 is opened while the ON signal from the sensor 41 is being input, the hot water supply is started and the hot water flow sensor 33 outputs the ON signal, thereby determining that the hot water supply and the hot water filling are used at the same time. The hot water filling of both conveyances using the bypass pipe 28 with the valve 27a closed is switched to the hot water filling of the single conveyance of only the bath return pipe 25 by closing the valve 27b. From simultaneous use of hot water filling When hot water supply is stopped by closing the hot water tap 4, the ON signal from the hot water flow sensor 33 disappears, and the ON signal of the hot water flow sensor 41 is continued. The transfer switching means 27 is switched back to hot water filling for both transfers using the bypass pipe 28 with the valve 27a closed.

Next, the operation of this embodiment will be described.
In the current boiling operation, when the hot water storage temperature sensor 44 detects that the necessary amount of heat does not remain in the hot water storage tank 2 the next day in the midnight power time zone, the hot water supply control unit 49 controls the heat pump control unit 21. A boiling start command is issued. Upon receiving the command, the heat pump controller 21 starts driving the heat pump circulation pump 20 after starting the compressor 15, and cools the low temperature water of about 5 to 20 ° C. taken out from the heat pump forward pipe 10 connected to the lower part of the hot water storage tank 2 as a refrigerant. The water heat exchanger 16 is heated to a high temperature of about 70 to 90 ° C., returned to the hot water storage tank 2 from the heat pump return pipe 11 connected to the upper part of the hot water storage tank 2, and sequentially stacked from the upper part of the hot water storage tank 2 We will store hot water. When the hot water storage temperature sensor 44 detects that the required amount of heat has been stored, the hot water supply control unit 49 issues a boiling stop command to the heat pump control unit 21, and the heat pump control unit 21 stops the compressor 15 and heat pump circulation. The pump 20 is also stopped and the boiling operation is finished.

  Next, the transfer of hot water filling to the bathtub 6 will be described with reference to the flowchart shown in FIG. 3. First, in step 50, whether or not hot water filling is in progress is determined by the presence or absence of the ON signal of the hot water filling flow sensor 41. The process proceeds to 51 to determine whether or not hot water supply is started based on the presence or absence of an ON signal of the hot water flow sensor 33. If YES, it is determined that hot water supply and hot water filling are used at the same time, and in step 52, the transfer switching means 27 is switched to the single transfer side. When ON, the hot water filling alone is used, so at step 53, the transfer switching means 27 is switched to both conveying sides. When NO at step 50, the hot water filling is not used, so the process proceeds to step 54. Thus, the transfer switching means 27 is maintained in the initial state of the single transfer state. Since the process repeats, the hot water supply is judged again in step 51 after the single conveyance in step 52, and when the hot water supply is turned on, that is, the hot water supply is completed, the flow proceeds to step 53 and the conveyance switching means 27 is switched from the single conveyance to the double conveyance. .

  In this way, in the hot water filling during hot water supply, the single-conveyance hot water filling is automatically selected in order to secure the amount of both hot water, and at a water supply pressure of 260 KPa, 11 L / min is obtained in the shower on the third floor. The use of upholstery is 8 L / min in the shower on the 3rd floor and 9 L / min on the second floor of the bathtub. The hot water supply and hot water filling are performed well without any unevenness of hot water on one side. When hot water supply is started during stretching, the hot water filling during both transports is switched to single transport by the transport switching means 27, so that hot water supply and hot water filling can be performed satisfactorily as described above. When the hot water supply is stopped after simultaneous use of the tension, the hot water filling is switched from the single conveying hot water filling to the double conveying hot water filling.

2 Hot water storage tank 3 Heating means 6 Bathtub 8 Hot water outlet pipe 9 Water supply pipe 27 Transfer switching means 29 Hot water supply mixing valve 31 Hot water supply pipe 34 Bath mixing valve 37 Hot water filling pipe 49 Hot water supply control section

Claims (1)

  A hot water mixing valve that mixes hot water from the hot water supply pipe and water from the first branch water supply pipe branched from the water supply pipe and supplies hot water from the hot water tap as hot water at a hot water set temperature, and from a branch hot water supply pipe branched from the hot water supply pipe A bath mixing valve that mixes hot water and water from the second branch water pipe branched from the water pipe, and fills the bathtub as a bath water having a bath set temperature via the hot water pipe, and hot water from the hot water pipe A hot water supply control comprising: a transfer switching means for switching between a single transfer performed from one side of the bath circulation circuit and a dual transfer performed from both; and a hot water supply control unit for controlling switching of the transfer switching means. When there is a hot water filling request during hot water supply, the hot water filling is carried out by one transfer, and when hot water is supplied during hot water filling, the transfer is switched from the double transfer to the single transfer, and when the hot water supply is completed, the transfer is switched to the double transfer. Hot water supply characterized by controlling the transfer switching means Location.

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