JP2012026709A - Water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water heater of a space-saving system excellent in instantaneous water heating performance.SOLUTION: The water heater includes: a hot water storage tank 4; a tapping pipe 6 connected to an upper part of the hot water storage tank 4; a water supply pipe 7 connected to a lower part of the hot water storage tank 4; a water supply branch pipe 8 branched from the water supply pipe 7; a mixing valve 9 in which the tapping pipe 6 and the water supply branch pipe 8 are connected to an inlet side thereof; a mixed-water pipe 10 connected to an outlet side of the mixing valve 9; a hot water supply port 3 connected to the mixed water pipe 10; and a heat-retention pump 11 connecting a connecting part of the mixed water pipe 10 and the water supply port 3, with the water supply branch pipe 8. A heat-retention pump 12 is disposed to the heat-retention pipe 11. Since a circulation circuit is formed to make the heat-retention pump 12 circulate hot water even during stop of hot water supply, the need of a large mounting space near the hot water supply port 3 is eliminated, and the hot water can be supplied just after start of the hot water supply.

Description

  The present invention relates to a hot water supply apparatus capable of supplying hot water at a desired temperature immediately after the start of hot water supply.

  A conventional hot water supply apparatus of this type is, for example, as shown in FIG. 3 (see, for example, Patent Document 1).

  FIG. 3 is a configuration diagram of a conventional hot water supply apparatus described in Patent Document 1 described above. As shown in FIG. 3, in a conventional hot water supply apparatus, an immediate hot water tank 1 is disposed between a hot water supply machine (not shown) and a hot water supply port 3, and water in the immediate hot water tank 1 is desired by a heater 2. In addition to heating to a temperature, the temperature of the pipe between the water heater and the immediate hot water tank 1 is detected, and if the temperature of the pipe is higher than a predetermined temperature, the hot water from the water heater is discharged and the temperature does not reach the predetermined temperature. In this case, the hot water is discharged from the hot water tank 1.

Japanese Patent Laid-Open No. 5-44993

  However, in the configuration of the conventional hot water supply apparatus, the hot water tank 1 is disposed in the vicinity of the hot water inlet 3 and the hot water in the immediate hot water tank 1 is heated by the heater 2. It is necessary to secure a space for installing the hot water tank 1. In addition, when the installation space cannot be secured in the vicinity, the hot water between the hot water tank 1 and the hot water supply port 3 cannot be heated, so that there is a problem that it takes time until the hot water comes out.

  This invention solves the said conventional subject, and it aims at providing the hot-water supply apparatus made into the space-saving system excellent in quick hot water property.

  In order to solve the conventional problems, a hot water supply apparatus of the present invention includes a hot water storage tank, a hot water pipe connected to an upper part of the hot water tank, a water supply pipe connected to a lower part of the hot water tank, and the water supply pipe. A feed water branch pipe branched from the feed water, a feed water mixer connected to the outlet pipe and the feed water branch pipe on the inlet side, a mixed water pipe connected to the outlet side of the feed water mixer, and connected to the mixed water pipe A hot water supply port, a mixed water pipe, a connecting part of the hot water supply port, and a heat insulating pipe for connecting the water supply branch pipe, and a conveying means is provided in the heat insulating pipe, and a circulation circuit is formed and hot water is stopped. In addition, hot water can be circulated by the conveying means, so that a large installation space is not required near the hot water supply port, and hot water can be supplied immediately when hot water supply is started.

  According to the present invention, it is possible to provide a hot water supply apparatus that can supply hot water immediately when hot water supply is started without requiring a large installation space near the hot water supply port.

Configuration diagram of hot water supply apparatus in Embodiment 1 of the present invention Control block diagram of the water heater Configuration diagram of conventional hot water supply equipment

  The first invention includes a hot water storage tank, a hot water pipe connected to the upper part of the hot water tank, a water supply pipe connected to the lower part of the hot water tank, a water supply branch pipe branched from the water supply pipe, and the hot water outlet A feed water mixer connected to the inlet side of the pipe and the feed water branch pipe, a mixed water pipe connected to the outlet side of the feed water mixer, a hot water outlet connected to the mixed water pipe, the mixed water pipe and the hot water supply It has a heat retaining pipe for connecting the mouth connecting portion and the water supply branch pipe, and the heat retaining pipe is provided with a conveying means, and a circulating circuit is formed so that hot water is circulated by the conveying means even when hot water is stopped. Therefore, it is possible to supply hot water immediately when hot water supply is started without requiring a large installation space near the hot water outlet.

  In particular, the second invention is provided with a mixed water temperature detecting means for detecting the hot water temperature in the mixed water pipe of the first invention, and the value detected by the mixed water temperature detecting means is a value determined on the basis of the hot water supply set temperature. In the feed water mixing device, the hot water in the hot water pipe and the feed water branch pipe is mixed so that the temperature of the hot water in the mixed water pipe is maintained at the temperature set by the user and set by the user immediately after the start of hot water supply. Hot water can be discharged at temperature.

  In the third invention, in particular, the heat insulation pipe of the first or second invention is provided with a check valve, so that the low temperature water from the water supply pipe is not supplied to the hot water outlet through the heat insulation pipe, and is stable. Hot water can be supplied at temperature.

  In particular, the fourth invention is provided with a heating means for heating the water in the hot water storage tank of any one of the first to third inventions, and the heating means is a heat pump unit. It becomes possible and energy efficiency improves.

  In the fifth invention, in particular, the heat pump unit according to the fourth invention uses carbon dioxide as a refrigerant. The use of carbon dioxide that is relatively inexpensive and stable as a refrigerant reduces the product cost and is reliable. Can be improved. In addition, carbon dioxide has an ozone depletion coefficient of zero and a global warming coefficient of about 1/700 of the alternative refrigerant HFC-407C, which is very small.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
A hot water supply apparatus according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a configuration diagram of a hot water supply apparatus according to the present embodiment.

  In FIG. 1, a hot water supply apparatus in the present embodiment includes a hot water storage tank 4, a heat pump unit 5 as a heating means for heating the water in the hot water storage tank 4, a hot water pipe 6 connected to the upper part of the hot water storage tank 4, A water supply pipe 7 connected to the lower part of the hot water tank 4, a water supply branch pipe 8 branched from the water supply pipe 7, and a mixing valve 9 as a water supply mixing apparatus in which the hot water pipe 6 and the water supply branch pipe 8 are connected to the inlet side. And a mixed water pipe 10 connected to the outlet side of the mixing valve 9, a hot water supply port 3 connected to the mixed water pipe 10, a heat insulating port for connecting the connecting part of the mixed water pipe 10 and the hot water supply port 3 and the water supply branch pipe 8. The heat retaining tube 11 is provided with a heat retaining pump 12 and a check valve 13 which are conveying means.

  Further, a control device 16 having a hot water supply temperature setting means 14 for setting the hot water supply temperature of the hot water supply port 3 and a control means 15 for controlling the operation of the mixing valve 9 based on the setting of the hot water supply temperature setting means 14 is provided. Yes.

  A mixed water temperature detection means 17 for hot water temperature control is provided on the outlet side of the mixing valve 9.

  FIG. 2 shows a block diagram of the control of the hot water supply apparatus in the present embodiment, and comprises control means 15 for controlling the heat retaining pump 12 and controlling the mixing valve 9 based on the setting of the hot water supply temperature setting means 14.

  About the hot water supply apparatus in this Embodiment comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  As a basic operation, before boiling, the hot water tank 4 is filled with a lot of low temperature water. When the operation is started, the water in the hot water tank 4 is sent to the heat pump unit 5 where it is heated and heated. Hot water is returned to the hot water tank 4. As a result, hot water is stored in the hot water tank 4. When using hot water after boiling, the hot water in the hot water storage tank 4 discharged from the hot water pipe 6 and the hot water from the water supply pipe 7 are mixed to the hot water supply set temperature ts by the mixing valve 9 and supplied to the hot water outlet 3. .

  Further, water corresponding to the amount of hot water used for hot water supply flows from the lower part of the hot water tank 4 through the water supply pipe 7. At this time, the low temperature water from the water supply pipe 7 is not supplied to the hot water supply port 3 through the heat insulation pipe 11 by the check valve 13 provided in the heat insulation pipe 11.

  While the hot water supply is stopped, the hot water in the hot water storage tank 4 is passed through the hot water discharge pipe 6, the mixing valve 9, the mixed water pipe 10, the heat insulating pipe 11, the water supply branch pipe 8, and the water supply pipe 7 in order by the heat pump 12. The circulation circuit which returns to 4 is distributed. Further, a part of the hot water that has passed through the heat insulation pipe 11 returns to the mixing valve 9 from the water supply branch pipe 8 and is mixed with the high temperature water from the hot water discharge pipe 6 and the hot water supply set temperature ts by the mixing valve 9 to be mixed with the mixed water pipe 10 and the heat insulation. Circulate the circulation circuit back to the pipe 11. Accordingly, the mixed water pipe 10 is always hot water at the hot water supply set temperature ts, and hot water at the hot water supply set temperature ts is immediately supplied to the hot water outlet 3 at the start of hot water supply.

  Thus, according to the present embodiment, the hot water storage tank 4, the hot water discharge pipe 6 connected to the upper part of the hot water storage tank 4, the water supply pipe 7 connected to the lower part of the hot water storage tank 4, and the water supply pipe 7 are branched. The feed water branch pipe 8, the tap water pipe 6 and the feed water branch pipe 8 connected to the inlet side, the mixed water pipe 10 connected to the outlet side of the mixing valve 9, and the mixed water pipe 10 A hot water supply port 3, a heat insulating tube 11 for connecting the connecting portion between the mixed water pipe 10 and the hot water supply port 3 and the water supply branch pipe 8, and a heat insulating pump 12 provided in the heat insulating tube 11, thereby providing a circulation circuit. The hot water can be circulated by the heat retaining pump 12 even when hot water supply is stopped, and a large installation space is not required near the hot water supply port 3, and hot water is supplied immediately when the hot water supply is started. Can do.

  Moreover, in this Embodiment, the mixed water temperature detection means 17 which detects the hot water temperature in the mixed water pipe 10 is provided, and the value which the mixed water temperature detection means 17 detects becomes a value determined on the basis of hot water supply preset temperature. By mixing the hot water in the hot water outlet pipe 6 and the feed water branch pipe 8 with the mixing valve 9, the temperature of the hot water in the mixed water pipe 10 is always maintained at the temperature set by the user, and is set by the user immediately after the start of hot water supply. Hot water can be discharged at temperature.

  Further, in the present embodiment, the check valve 13 is provided in the heat retaining pipe 11, so that the low temperature water from the water supply pipe 7 is not supplied to the hot water inlet 3 through the heat retaining pipe 11, and the stable temperature Hot water can be supplied at.

  Furthermore, in the present embodiment, by using a heat pump unit as the heating means, highly efficient boiling operation is possible, and energy efficiency is improved.

  In the present embodiment, the refrigerant used for the heat pump unit is carbon dioxide, and by using carbon dioxide that is relatively inexpensive and stable, the product cost is reduced and the reliability is improved. be able to. In addition, since carbon dioxide has an ozone depletion coefficient of zero and a global warming coefficient of about 1/700 of the alternative refrigerant HFC-407C, it can provide a hot water supply apparatus that is friendly to the global environment.

  As described above, the hot water supply apparatus according to the present invention does not require a large installation space near the hot water supply port, and can supply hot water immediately when hot water supply is started. In addition to being applicable to hot water supply devices, it can also be applied to large-scale applications such as business use in a system having a heat source and a hot water storage tank, and can provide excellent space saving and quick hot water.

3 Hot water outlet 4 Hot water storage tank 5 Heating means (heat pump unit)
6 Hot water discharge pipe 7 Water supply pipe 8 Water supply branch pipe 9 Mixing valve (water supply mixing device)
10 Mixing water pipe 11 Heat insulation pipe 12 Heat insulation pump (conveyance means)
13 Check valve 14 Hot water supply temperature setting means 15 Control means 16 Control device 17 Mixed water temperature detection means

Claims (5)

A hot water storage tank, a hot water pipe connected to the upper part of the hot water tank, a water supply pipe connected to the lower part of the hot water tank, a water supply branch pipe branched from the water supply pipe, the hot water pipe and the water supply branch pipe A feed water mixing device connected to the inlet side, a mixed water pipe connected to the outlet side of the feed water mixing device, a hot water supply port connected to the mixed water tube, a connecting portion between the mixed water tube and the hot water supply port, and the A hot water supply apparatus comprising: a heat retaining pipe connected to a water supply branch pipe; and a conveying means provided in the heat retaining pipe. A mixed water temperature detecting means for detecting the hot water temperature in the mixed water pipe is provided, and the hot water pipe and the water supply are provided in the water supply mixing device so that the value detected by the mixed water temperature detecting means becomes a value determined on the basis of the hot water supply set temperature. The hot water supply apparatus according to claim 1, wherein hot water of the branch pipe is mixed. The hot water supply apparatus according to claim 1 or 2, wherein a check valve is provided in the heat insulation pipe. The hot water supply apparatus according to any one of claims 1 to 3, wherein heating means for heating water in the hot water storage tank is provided, and the heating means is a heat pump unit. The hot water supply apparatus according to claim 4, wherein the heat pump unit uses carbon dioxide as a refrigerant.

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