JP4878910B2 - Hot water system - Google Patents

Description

The present invention relates to a hot water supply system for re-heating the hot water flowing through the hot water supply pipe leading to the hot water outlet from the hot water storage tank.

  Conventionally, for example, as a hot water supply system for home use, there is a hot water supply system in which hot water heated by a heater is stored in a hot water storage tank, and hot water is supplied to a hot water outlet such as a shower or a currant through a hot water supply pipe. It is common. In such a conventional hot water supply system, when hot water in the hot water supply pipe is not used, it is left to be cooled by the outside air while being kept warm by a heat insulating material or the like, or hot water in the hot water supply pipe is forcibly circulated. Let's keep the hot water temperature.

For example, in the hot water device described in Patent Document 1, a storage battery is charged with electric power of a solar battery, hot water of a hot water storage tank is heated with electric power of the storage battery, and hot water of the heated hot water storage tank is supplied with hot water via a hot water supply pipe. Yes. Moreover, although the method of forcibly circulating hot water in hot water supply piping and maintaining hot water temperature is frequently used, among these, in the apparatus described in Patent Document 2, not only hot water is circulated in hot water supply piping. The system has a heat exchange mechanism that exchanges heat between the hot water in the hot water storage tank and the hot water in the circulating hot water pipe. It proposes a reduction in equipment costs and running costs by omitting electrical failures by omitting sensors.
JP 2000-55479 A JP 2004-333063 A

  As described above, in the conventional hot water supply system that supplies hot water stored in the hot water storage tank, while hot water is not being supplied, the hot water staying in the hot water supply pipe cools, opens the hot water supply port, and starts hot water supply. Cold water often comes out for a while. And for the convenience of space, the hot water storage tank is often installed in a place away from a hot water supply place such as a bathroom, and the hot water supply pipe becomes long. Become more. For this reason, the user must wait for a long time until the hot water comes out, which is unpleasant, and there is a problem that the water until the hot water is thrown away is wasted. Moreover, in the system which circulates hot water in the hot water supply pipe, there are problems that the thermal efficiency is lowered and the equipment cost is increased.

  The present invention has been made to solve the above problems, and when hot water stored in a hot water storage tank is supplied from a hot water supply port via a hot water supply pipe, hot water supply is started without causing a decrease in thermal efficiency or an increase in equipment costs. The purpose is to enable hot water to be supplied immediately after the hot water.

In order to achieve the above object, the first invention includes a hot water storage tank for storing hot water, a hot water supply pipe for guiding the hot water stored in the hot water storage tank to a hot water supply port, and the vicinity of the hot water supply port in the hot water supply pipe A reheating unit provided at a position for reheating hot water flowing through the hot water supply pipe,
The reheating part is a hot water storage tank, an introduction part for introducing a part of hot water supplied from the hot water supply pipe into the hot water storage tank, a tubular guide part for guiding the remaining hot water supplied from the hot water supply pipe, Heating means for reheating the hot water stored in the hot water tank with a heater that generates heat when energized, the remainder of the hot water supplied from the guide section, and the inside of the hot water tank reheated by the heating means A mixing part that generates warm water by mixing the hot water and a connecting part that connects the ends of the guide part and the mixing part, and that can be deformed flexibly .
The mixing unit is constituted by a perforated tube, and hot water introduced into the tube through the guide unit and hot water re-heated by the heating means flowing into the tube through the hole from the hot water storage tank are predetermined. It is the hot water supply system characterized by mixing in the ratio of .

  The second invention is a heating control means for reheating hot water by the heating means when the water temperature in the hot water supply pipe is equal to or lower than a predetermined lower limit temperature in the first invention, and stopping heating when the predetermined upper limit temperature is reached. It is a hot water supply system characterized by comprising.

  3rd invention is a hot water supply system provided with the storage battery as the main power supply of the said heating means in 1st invention.

  According to a fourth aspect of the present invention, when the water temperature in the hot water supply pipe is equal to or lower than a predetermined lower limit temperature, the energization from the storage battery to the heating means is performed, and the energization is stopped when the predetermined upper limit temperature is reached. A hot water supply pipe reheating system comprising heating control means.

  According to a fifth aspect of the present invention, there is provided a hot water supply system comprising charging means for charging the storage battery with a commercial power source in any one of the third to fourth aspects of the invention.

  According to a sixth invention, in any one of the third to fifth inventions, the storage battery is a lead storage battery, a silver / zinc storage battery, a lithium / ion storage battery, a nickel / metal hydroxide storage battery, a NaS battery, or a nickel / zinc storage battery. The hot water supply system according to claim 1, wherein the hot water supply system is at least one of a lithium metal storage battery and a capacitor.

  According to the present invention, when hot water stored in a hot water storage tank is supplied from a hot water supply port, hot hot water can be supplied immediately after the start of hot water supply. Moreover, since the circulation of hot water, which has conventionally been performed to supplement the cooling of hot water in the hot water supply pipe, is no longer necessary, a decrease in thermal efficiency and a rise in equipment can be suppressed.

  FIG. 1 is an overall configuration diagram of a hot water supply system 10 according to a first embodiment of the present invention. As shown in the figure, a hot water supply system 10 of the present embodiment includes a hot water storage tank 20, a hot water supply pipe 28 that guides hot water stored in the hot water storage tank 20 to a hot water supply port 26 such as a shower 22 and a currant 24, and a hot water supply pipe. 28 is provided at a position near the hot water supply port 26 and includes a reheating unit 30 for reheating hot water flowing through the hot water supply pipe 28.

  The hot water storage tank 20 heats the cold water supplied from the water supply pipe 21 with, for example, a water heater (not shown) that is an electric heater and stores the heated hot water. Further, the hot water supply port 26 is provided with a mixing faucet (not shown) for mixing cold water with hot water supplied from the hot water supply pipe 28, and the user operates the mixing faucet to operate the hot water supply temperature. Can be adjusted.

FIG. 2 is a diagram illustrating a configuration of the reheating unit 30 in the present embodiment. As shown in the figure, the reheating unit 30 includes a hot water storage tank 40, an upstream hot water supply pipe 28 a , a downstream hot water supply pipe 28 b , a heating means 31, a mixing unit 46, a heater control unit 47, and a storage battery 32.

The upstream hot water supply pipe 28 a connects a hot water storage tank installed outdoors and the hot water storage tank 40, and branches into an introduction pipe 43 and a mixing pipe 44 in the hot water storage tank 40. The introduction pipe 43 is open at the lower end in the hot water tank 40 and introduces a part of the hot water supplied from the upstream hot water supply pipe 28a into the hot water tank 40. Equivalent to. The mixing pipe 44 guides the remaining hot water supplied from the upstream hot water supply pipe 28a to the mixing section 46, and corresponds to the “guide section” of the present invention. The ends of the mixing tube 44 and the mixing portion 46 are connected to each other via a connecting tube 45 (corresponding to the “connecting portion” of the present invention) that can be flexibly deformed. As a result, even when a relative displacement occurs between the mixing tube 44 and the mixing portion 46 due to an external vibration or impact such as an earthquake, the relative displacement can be absorbed and damage to the connecting portion can be prevented. It is like that.

The hot water storage tank 40 is a tank for storing hot water guided through the upstream hot water supply pipe 28a . The hot water storage tank 40 may include a safety valve 41 for adjusting the pressure in the tank and a drain outlet 42 for maintenance in the tank.

  The heating means 31 is formed, for example, in a coil shape, and includes a heater having a property of generating heat immediately when energized, and can reheat the hot water stored in the hot water tank 40. As the power source of the heating means 31, a commercial power source may be used, or the storage battery 32 described above may be used.

The mixing part 46 is constituted by a perforated pipe, and hot water introduced into the pipe from the upstream hot water supply pipe 28a through the mixing pipe 44 and the heating means 31 flowing into the pipe from the hot water tank 40 through the hole. The reheated hot and cold water is mixed at a predetermined ratio. This mixing ratio can be set, for example, according to the size and number of holes of the perforated pipe constituting the mixing section 46, the diameters of the introduction pipe 43 and the mixing pipe 44, and the like.

The downstream hot water supply pipe 28b guides the hot water mixed in the mixing unit 46 as described above to a hot water outlet such as a shower or a currant. At the hot water outlet, the user of hot water can adjust the amount of hot water by mixing it with tap water as appropriate.

  The heater control unit 47 includes a temperature sensor for measuring the water temperature in the hot water storage tank 40. When the water temperature in the hot water storage tank 40 is lower than the first predetermined temperature T0, the heater control unit 47 is turned on. By turning it on, the water in the hot water tank 40 is heated by the heating means 31. On the other hand, when the water temperature in the hot water storage tank 40 reaches the second predetermined temperature T1 (> T0), heating by the heating unit 31 is stopped by turning off the power of the heating unit 31.

  Examples of the storage battery 32 serving as a power source for the heating means 31 include a lead storage battery, a silver / zinc storage battery, a lithium ion storage battery, a nickel / metal hydroxide storage battery, a NaS battery, a nickel / zinc storage battery, a lithium metal storage battery, and a large capacity A secondary battery such as an output capacitor can be used. In particular, a lithium ion storage battery is preferable as a power source for the heating means 31 because of its large capacity, high output and high efficiency.

  As shown in FIG. 1, the hot water supply system of the present embodiment includes a charging circuit 60 that charges the storage battery 32. As shown in the figure, the charging circuit 60 basically includes a commercial power source 62 and a diode 66. However, according to the kind of secondary storage battery to be used, it comprises so that the optimal charging / discharging form which considered the cost can be taken. For example, when using a lithium-ion battery as a secondary storage battery, use a charging method such as constant current charging or constant voltage charging, and use an overcharge protection device or a device that can manage each cell unit if necessary. Append. In addition, an overdischarge prevention device is added in consideration of the battery life.

  In the present embodiment, it is desirable that at least the periphery of the reheating unit 30 be packed with a heat insulating material so that the hot water can be efficiently reheated inside the reheating unit 30.

  In the present embodiment, the storage battery 32 is charged with a commercial power supply for 24 hours. However, the present invention is not limited to this, and the secondary storage battery cost will be significantly reduced in the future, and it will be economically established. May be installed with a secondary battery with a large capacity (for example, about 40 kWh) and charged with nighttime power, may be charged with a distributed power source such as a solar cell, or a commercial power source and a solar cell, etc. It is good also as charging with the hybrid system of.

  According to the above configuration, when the temperature of the hot water in the hot water supply pipe 28 is equal to or lower than a predetermined lower limit temperature (for example, 60 ° C.), the heating means 31 generates heat by energizing the heating means 31 from the storage battery 32, and hot water supply Hot water flowing through the pipe 28 is reheated by the reheating unit 30. Therefore, even if the hot water supplied from the hot water storage tank 20 stays in the hot water supply pipe 28 and cools to a predetermined temperature or lower, the hot water is reheated by the heating means 31 and then supplied from the hot water supply port 26. Will be. For this reason, since hot hot water is supplied immediately after the hot water supply port 26 such as the shower 22 or the currant 24 is opened and hot water supply is started, there is no inconvenience that it is necessary to wait for the water temperature to rise as before. The person can use the shower 22 and the like comfortably, and since the cooled water that comes out after the start of hot water supply is not wasted, it is also useful for saving water.

  Even when hot water is not being supplied from the hot water supply port 26, if the hot water in the reheating unit 30 becomes equal to or higher than a predetermined temperature (for example, 90 ° C.), heating is performed by turning off the power of the heating means 31. Since the heating by the means 31 is stopped, unnecessary reheating can be prevented, and overheating does not occur.

  In the present embodiment, since the hot water flowing through the reheating pipe 38 is heated by the heating means 31, it is necessary to supply a large amount of electric power to the heating means 31. For this reason, if a commercial power source is used as the power source of the heating means 31, the contract power with the power company must be increased. However, it is necessary to supply a large amount of power to the heating means 31 only for a few liters in a short period of time immediately after the start of hot water supply. Increasing the basic contract power is costly. On the other hand, in this embodiment, there is no such problem by using the storage battery 32 such as a lithium ion battery capable of outputting a large amount of power as the power source of the heating unit 31, and the hot water supply system 10 is applied. The basic contract fee for electricity bills can be reduced.

  In addition, it is not necessary to circulate hot water as in the past to maintain the temperature of hot water in hot water supply pipes, so it is possible to suppress a decrease in thermal efficiency and an increase in equipment costs. Introduction of an efficient centralized hot water supply system applicable to

  In addition, the description of the above embodiment is for facilitating understanding of the present invention, and does not limit the present invention. It goes without saying that the present invention can be changed and improved without departing from the gist thereof, and that the present invention includes equivalents thereof.

1 is an overall configuration diagram of a hot water supply system according to an embodiment of the present invention. It is a cross-sectional view which shows the structure of the reheating part in embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hot water supply system 20 Hot water storage tank 22 Shower 24 Callan 26 Hot water supply port 28, 28a, 28b Hot water supply piping 30 Reheating part 31 Heating means 32 Storage battery 40 Hot water storage tank 41 Safety valve 42 Drain outlet 43 Introducing pipe 44 Mixing pipe 45 Connecting pipe 46 Mixing part 47 Heater controller

Claims (6)

A hot water storage tank for storing hot water;
A hot water supply pipe for guiding the hot water stored in the hot water storage tank to the hot water outlet;
A reheating unit that is provided near the hot water supply port in the hot water supply pipe and reheats hot water flowing through the hot water supply pipe;
With
The reheating unit
A hot water tank,
An introduction part for introducing a part of hot water supplied from the hot water supply pipe into the hot water storage tank;
A tubular guide that guides the remaining hot water supplied from the hot water supply pipe;
Heating means for reheating the hot water stored in the hot water tank with a heater that generates heat when energized;
A mixing section for generating hot water by mixing the remaining hot water supplied from the guide section and the hot water in the hot water tank reheated by the heating means;
A flexible deformable connecting portion for connecting the end portions of the guiding portion and the mixing portion;
Equipped with a,
The mixing unit is constituted by a perforated tube, and hot water introduced into the tube through the guide unit and hot water re-heated by the heating means flowing into the tube through the hole from the hot water storage tank are predetermined. Hot water supply system characterized by mixing at a ratio of <br/>.   2. A heating control means for reheating hot water by the heating means when the water temperature in the hot water supply pipe is equal to or lower than a predetermined lower limit temperature and stopping heating when the temperature reaches a predetermined upper limit temperature. Hot water system.   The hot water supply system according to claim 1, further comprising a storage battery as a main power source of the heating means.   A heating control means is provided for energizing the heating means from the storage battery when the water temperature in the hot water supply pipe is equal to or lower than a predetermined lower limit temperature, and stopping energization when a predetermined upper limit temperature is reached. Item 4. The hot water supply pipe reheating system according to Item 3.   The hot water supply system according to any one of claims 3 to 4, further comprising charging means for charging the storage battery with a commercial power source.   The storage battery is at least one of a lead storage battery, a silver / zinc storage battery, a lithium / ion storage battery, a nickel / metal hydroxide storage battery, a NaS battery, a nickel / zinc storage battery, a lithium metal storage battery, and a capacitor. The hot water supply system according to any one of claims 3 to 5.

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