JP2009138981A - Hot water storage type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water storage type water heater capable of using up the stored water of high temperature. <P>SOLUTION: This hot water storage type water heater comprises a hot water storage tank 1 for storing the warm water heated by a heating means 2, a water supply pipe 3 for supplying the supply water to the hot water storage tank 1, a hot water supply pipe 4 communicated with an upper portion of the hot water storage tank 1 and supplying the water of high temperature, and a plurality of hot water storage temperature sensors 13 vertically disposed on an outer periphery of the hot water storage tank 1 and detecting the hot water storage amount with a temperature in the hot water storage tank 1. A cutoff valve 16 disposed in the water supply pipe 3 is opened and closed to intermittently supply hot water on the basis of the detection of the prescribed hot water remaining amount by the hot water storage temperature sensor 13, and annunciation can be performed, so that a user can be notified of that the limited amount of hot water is left, and hot water supply is changed to water supply, thus the user can prepare for it, and can use up the stored warm water at ease, and economic performance and usability can be improved. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hot water storage type hot water supply apparatus that can use hot water stored in a hot water storage tank to the end for hot water supply.

Conventionally, in this type, hot water in the hot water storage tank is suppressed from running out by reducing the amount of hot water with a flow control valve, and the time until hot water runs out is prolonged. (For example, refer to Patent Document 1.)
JP 2001-82806 A

  By the way, with this conventional one, it is possible to extend the time until the hot water stored in the hot water tank runs out, but it is natural that the hot water runs out and can solve the problem of suddenly changing from hot water to cold water when the hot water runs out. It was not, and the user's mind was not ready.

  The present invention pays attention to this point and solves the above-mentioned drawbacks. In particular, the structure is provided in a hot water storage tank for storing hot water heated by heating means, a water supply pipe for supplying water to the hot water storage tank, and an upper portion of the hot water storage tank. A hot water storage pipe for discharging hot water, and a hot water storage temperature sensor that is provided in a plurality in the vertical direction of the outer periphery of the hot water storage tank and detects the hot water storage amount together with the internal temperature of the hot water storage tank. By detecting a predetermined amount of remaining hot water, the shutoff valve provided in the water supply pipe is opened and closed to supply intermittent hot water.

  According to the present invention, when a hot water shortage is about to be detected by a decrease in the amount of remaining hot water, and the hot water supply is interrupted by opening and closing the shut-off valve, the remaining hot water is reduced and the user is notified that the hot water supply will soon be changed to water supply. By preparing and preparing, it is possible to use the hot water stored in the hot water to the end with peace of mind, which is economical and convenient to use.

Next, an embodiment of the present invention will be described based on a hot water storage type hot water supply apparatus shown in the drawings.
1 is a cylindrical hot water storage tank that uses heating means 2 comprising a heat-pump unit using carbon dioxide refrigerant to boil hot water in the midnight hours when the unit price of contract power by time is low and store hot water. A water supply pipe 3 for supplying water is connected to the bottom, and a hot water discharge pipe 4 for discharging hot water stored in a hot water tap (not shown) or the like is connected to the top.

  Reference numeral 5 denotes a hot water supply pipe 4 on one side, a hot water supply water bypass pipe 6 branched from the water supply pipe 3 on the other side, and a hot water mixing valve comprising an electric three-way valve connected to a hot water supply pipe 7 in the center. The hot water and hot water supply bypass pipe 6 are mixed and supplied at a hot water supply set temperature set by the kitchen remote controller 8. The hot water supply thermistor 9 provided in the hot water supply pipe 7 is used. The hot water side opening of the hot water discharge pipe 4 and the water side opening of the hot water supply water supply bypass pipe 6 are adjusted by feedforward control from the hot water supply temperature, the water supply temperature, and the hot water supply set temperature.

  10 is connected to a hot water supply pipe 4 on one side, and a hot water supply bypass pipe 11 branched from the hot water supply water supply bypass pipe 6 on the other side, and the center is connected to a bath circulation circuit (not shown). The hot water from the outlet pipe 4 and the water supply from the bath water supply bypass pipe 11 are mixed with the bath mixing valve composed of an electric three-way valve so that the bath set temperature set by the bathroom remote controller 12 is obtained. Hot water filling is performed, and the hot water side opening of the hot water discharge pipe 4 and the water side opening of the hot water supply bypass pipe 11 are adjusted by feedforward control from the hot water temperature, the water supply temperature, and the bath set temperature.

  Reference numeral 13 denotes a plurality of hot water storage temperature sensors attached to the outer peripheral wall of the hot water storage tank 1. Four hot water storage devices 13 a, 13 b, 13 c, and 13 d are provided in order from the top at equal intervals in the vertical direction. This is input to the hot water supply control unit 14 to perform calculation and operation control of the remaining hot water amount, the boiling operation, the boiling end operation, and the like.

  The hot water supply control unit 14 opens and closes the shutoff valve 16 provided on the upstream side of the pressure reducing valve 15 of the water supply pipe 3 for several seconds when the remaining hot water amount reaches a predetermined remaining hot water amount detected here by the hot water storage temperature sensor 13a, here 50L. This controls the hot water supply intermittently and informs the user that the hot water is almost exhausted.

  The shutoff valve 16 also serves as an emergency shutoff valve that closes the water supply pipe 3 by detecting water leakage from the hot water storage tank 1 or each pipe, and this operation is given priority.

Reference numeral 17 denotes a heating circulation circuit including an outward pipe 18, a return pipe 19, and a circulation pump 20 that connect the hot water storage tank 1 and the heating means 2 so that hot water can be circulated.
21 is a water supply thermistor provided in the middle of the water supply pipe 3, 22 is a pressure relief valve provided in the hot water discharge pipe 4, and 23 is a reverse that prevents a reverse flow from the hot water storage tank 1 side provided in the water supply pipe 3. It is a stop.

Next, the operation of this embodiment will be described.
In the midnight time zone of the contract power now, the hot water supply control unit 14 calculates and determines the target boiling temperature from the amount of remaining hot water the day before, and the heating circulation circuit 17 lowers the hot water tank 1 so as to reach this target boiling temperature. The hot water is boiled by the heating means 2, the hot water is returned to the upper part of the hot water storage tank 1, and this circulation is sequentially repeated so that all the hot water temperature sensors 13 detect the target boiling temperature by 7am the next morning. Hot water is stored in the entire hot water storage tank 1.

  The hot water in the hot water storage tank 1 is mixed with the hot water from the hot water outlet pipe 4 and the hot water from the hot water supply water bypass pipe 6 by the hot water supply mixing valve 5 and used as hot water at a hot water supply set temperature for hot water supply. The hot water in the hot water storage tank 1 from the hot water discharge pipe 4 and the hot water in the hot water supply bypass pipe 11 are mixed in the bath mixing valve 10 and used as hot water at the bath set temperature. Is.

  As the hot water in the hot water storage tank 1 is sequentially used as described above, the amount of remaining hot water in the hot water storage tank 1 decreases, and the amount of remaining hot water decreases to the hot water storage temperature sensor 13a at the top of the hot water storage tank 1. The hot water storage temperature sensor 13a detects and controls the shut-off valve 16 to open and close for several seconds via the hot water supply control unit 14, so that the hot water is interrupted and the user during hot water feels that the hot water is almost out. Because it recognizes, there is no surprise even if it reaches the water supply after sleding, and the hot water can be used up to the end with peace of mind, and it is extremely economical and convenient to use.

In addition, by intermittently supplying hot water, it is possible to notify the user that the hot water is about to run out, so that the user can be surely notified, and the use of the hot water after that can be left to the user himself. Is.
Further, when the hot water finally runs out, “hot water storage amount 0” may be blinked and displayed on the display unit of the kitchen remote controller 8.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic explanatory drawing of the hot water storage type hot water supply apparatus which shows one Embodiment of this invention. The block diagram of the principal part electric circuit. The timing chart of the principal part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Heating means 3 Water supply pipe 4 Hot water discharge pipe 13 Hot water storage temperature sensor 16 Shutoff valve

Claims (1)

  A hot water storage tank for storing hot water heated by the heating means, a water supply pipe for supplying water to the hot water storage tank, a hot water discharge pipe for discharging hot water connected to the upper part of the hot water storage tank, and a plurality of vertical pipes on the outer periphery of the hot water storage tank Provided with a hot water storage temperature sensor for detecting a hot water storage amount together with the temperature in the hot water storage tank, the hot water storage temperature sensor detects a predetermined remaining hot water amount to open and close a shutoff valve provided in the water supply pipe. Hot water storage type hot water supply device characterized by intermittent hot water supply.

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