JP2010243094A - Hot water storage water heater - Google Patents

Abstract

A hot water storage type hot water supply apparatus capable of reliably preventing freezing of a hot water filling circuit and a hopper unit is provided.
High temperature water from a bath hot water pipe 11 branched from a hot water pipe 4 and water supplied from a second water supply bypass pipe 12 branched from a water supply pipe 3 or a first water supply bypass pipe 6 are mixed to have a set temperature. The hot water filling circuit 13 includes a hot water filling flow sensor 17 and a hot water filling. The hot water filling circuit 13 supplies the hot water from the bath mixing valve 10 to the bathtub 16 via the bath circulation circuit 15. When the bath mixing valve 10 is stopped and the outside air temperature reaches a predetermined freezing prevention temperature when the bath mixing valve 10 is stopped, the water-side opening state is established. Since the control means 31 is controlled so as to communicate with the hot water filling circuit 13 from the hot water side open state, the hot water in the upper part of the hot water storage tank 1 flows into the hot water filling circuit 13 by natural convection through the hot water discharge pipe 4. Securely prevent freezing Can.
[Selection] Figure 1

Description

  The present invention relates to a hot water storage type hot water supply apparatus that can reliably prevent freezing of a hopper unit in a hot water filling circuit.

  Conventionally, when there is a risk of freezing, this type of switch can be used with confidence by preventing the risk of freezing by switching the hot water / water mixing valve to the water side and flowing the water through a hot water supply circuit. It was something like that.

JP 2006-17373 A

  By the way, in this conventional one, tap water is drained wastefully and it is uneconomical, and when this is carried out in a hot water filling circuit, since there is no function of reducing the amount of water, a large amount of water flows into the bathtub. Therefore, it was impossible to use this.

  This invention pays attention to this point and solves the above-mentioned drawbacks. In particular, the structure is connected to a hot water storage tank for storing hot water heated by heating means, and a water supply pipe for supplying water is connected to the lower part of the hot water storage tank, A hot water discharge pipe for discharging hot water is connected to the upper part of the hot water storage tank. The hot water discharged from the hot water pipe and the water supplied from the first water supply bypass pipe branched from the water supply pipe are mixed to supply hot water at a set temperature. Hot water mixing valve to be performed, hot water from a bath outlet pipe branched from the outlet pipe, and hot water from a second water supply bypass pipe branched from the water supply pipe or the first water supply bypass pipe are mixed in the bath hot water at a set temperature. And a hot water filling circuit for supplying hot water from the bath mixing valve to the bathtub through the bath circulation circuit, a hot water flow sensor, a hot water solenoid valve, and two check valves A hopper unit consisting of The bath mixing valve is controlled by the control means so that when the outside air temperature reaches a predetermined freezing prevention temperature when the bath mixing valve is stopped, it is communicated with the hot water filling circuit from the water side open state to the hot water side open state. It is what is done.

  As described above, according to the present invention, when the outside air temperature is lowered and there is a risk that the hot water filling circuit, particularly the hopper unit, freezes, the bath mixing valve is driven to bring the hot water side into communication with the hot water filling circuit. The hot water in the upper part of the hot water storage tank flows naturally into the hot water filling circuit through the hot water pipe, and the hot water solenoid valve is closed so that it does not flow into the hopper unit. As the hopper unit rises, the hopper unit is also prevented from freezing, and there is no problem such as the hot hopper unit becoming frozen and no hot water filling can occur or it may break and cause hot water leakage. It can be done.

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 flowchart of the principal part. A schematic diagram of the bath mixing valve shows a 100% water side state. In the schematic block diagram of the bath mixing valve, the hot water side is switched to the 100% state.

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 composed of a heat-pump unit using carbon dioxide refrigerant to boil hot water and store hot water in the midnight hours when the unit price of contracted power by time is low. The lower part is connected to a water supply pipe 3 for supplying water, and the upper part is connected to a hot water discharge pipe 4 for discharging hot water stored in a hot water tap (not shown).

  5 is composed of a hot water supply pipe 4 on one side, a first water supply bypass pipe 6 branched from the water supply pipe 3 on the other side, and a SAM type (shape memory alloy built-in type) electric three-way valve with a hot water supply pipe 7 connected to the center. The hot water mixing valve mixes the hot water from the hot water supply pipe 4 with the water supplied from the first water supply bypass pipe 6 and supplies the hot water at a set hot water temperature set by the kitchen remote controller 8. The hot water side opening degree of the tapping pipe 4 and the water side opening degree of the first water supply bypass pipe 6 are adjusted by feedforward control from the hot water supply temperature, the hot water temperature, and the hot water set temperature by the hot water supply thermistor 9 provided in the pipe 7. .

  10 is connected to a hot water discharge pipe 11 branched from the hot water discharge pipe 4 on one side, a second water supply bypass pipe 12 branched from the first water supply bypass pipe 6 on the other side, and a hot water filling circuit 13 connected to the center. A bath mixing valve composed of a three-way valve mixes high-temperature water from the bath outlet pipe 11 and water from the second water supply bypass pipe 12 so that the set temperature set by the bathroom remote controller 14 is reached. The hot water side opening of the bath hot water discharge pipe 11 and the water side opening of the second water supply bypass pipe 12 are adjusted by feedforward control from the hot water temperature, the hot water temperature, and the bath set temperature. Hot water at a preset bath temperature is supplied to the hot water filling circuit 13, and a set amount of hot water or additional hot water is applied to the bathtub 16 at a preset temperature via a bath circulation circuit 15 communicated with the hot water filling circuit 13.

  A hot water flow sensor 17 is provided in the hot water filling circuit 13 and counts the flow rate of hot water filling. The hot water filling solenoid valve 18 is provided downstream to start counting. Further downstream, two check valves 19 and 20 that allow flow in the hot water filling direction but prevent reverse flow are provided, and between the two check valves 19 and 20 and the bath mixing valve 10. A drain pipe 22 having a drain valve 21 communicating with the hot water flow sensor 17 is provided.

  The bath circulation circuit 15 that connects the bathtub 16 and the bath heat exchanger 23 provided in the upper part of the hot water storage tank 1 includes a bath thermistor 24 that detects the bath water temperature in the vicinity of the hot water filling circuit 13 connected thereto, A bath flow sensor 25 that detects the presence or absence of residual water is provided. 26 is a bath circulation pump that circulates and heats bathtub water between the bathtub 16 and the bath heat exchanger 23, 27 is a water level sensor that detects the water level in the bathtub 16, and 28 is a bypass path 29 that bypasses the bath heat exchanger 23. The bath three-way valve provided in is used to switch between passing the bath water through the bath heat exchanger 23 side or passing through the bypass path 29 without passing through the bath heat exchanger 23 side.

  Further, the hot water flow sensor 17, hot water solenoid valve 18, two check valves 19 and 20, a drain pipe 22 having a drain valve 21, a bath thermistor 24, and a bath flow sensor 25 are integrally configured to be a hopper. The unit 30 is collected as one part, and the parts are exchanged together.

  31 is a control means comprising a microcomputer connected to the kitchen remote control 8 and the bathroom remote control 14 for controlling hot water supply, bath filling, and hot water. Various sensors are connected to the input side, and the outside temperature is controlled. When the outside air temperature sensor 32 to be detected is connected, and the outside air temperature detected by the outside air temperature sensor 32 is less than 3 ° C. here, the control means 31 outputs the bath mixing valve 10 to the second water supply bypass pipe. The hot water in the upper part of the hot water storage tank 1 passes through the bath hot water discharge pipe 11 by making the hot water filling circuit 13 communicate with the hot water side 100% opening of the hot water hot water discharge pipe 11 from the water side 100% opening degree of 12. The hot water filling circuit 13 circulates in the hot water filling circuit 13 and warms up the hot water filling circuit 13, and the ambient temperature rises due to the heat conduction and heat dissipation to prevent the hopper unit 30 from freezing. The outside temperature Above the temperature, here at 3 ° C. or higher, the control means 31 does not output and the bath mixing valve 10 maintains the water side 100% opening state of the second feed water bypass pipe 12 as it was when the operation was stopped. .

33 is a water supply thermistor provided in the water supply pipe 3 for detecting the water supply temperature, and 34 is a pressure reducing valve for reducing the water supply pressure.
Reference numeral 35 denotes a heating circulation circuit including an outward pipe 36, a return pipe 37, and a circulation pump 38 that connect the hot water storage tank 1 and the heating means 2 so that hot water can circulate.
Reference numerals 39, 40, 41, 42 and 43 are hot water storage temperature sensors provided above and below the outer peripheral surface of the hot water storage tank 1, and 44 is a pressure relief valve provided in the hot water discharge pipe 4.

Next, the operation of this embodiment will be described.
In the midnight time zone of the contract power now, the low-temperature water in the lower part of the hot water tank 1 is boiled by the heating means 2 by the heating circuit 35, the hot water is returned to the upper part of the hot water tank 1, and this circulation is repeated sequentially from 23:00. The hot water is stored in the entire hot water storage tank 1 by 7 o'clock the next morning.

  And the hot water in this hot water storage tank 1 is mixed with the hot water from the hot water discharge pipe 4 and the hot water from the 1st hot water bypass pipe 6 with the hot water supply mixing valve 5, and is utilized for hot water supply as hot water of hot water supply preset temperature. Is.

  Next, when performing hot water supply such as hot water filling, the control means 31 opens the hot water solenoid valve 18 and drives the bath mixing valve 10 by instructing hot water filling with the kitchen remote control 8 or the bathroom remote control 14. By gradually opening the bath discharge pipe 11 in a closed state, hot water from the upper part of the hot water storage tank 1 is supplied through the bath discharge pipe 11, while water is supplied from the second water supply bypass pipe 12. The hot water and water supply are bath mixing valves 10, and the hot water side opening of the bath hot water discharge pipe 11 and the water side opening of the second water supply bypass pipe 12 are determined by the control means 31 from the hot water temperature, the water supply temperature, and the bath set temperature. Is adjusted by feedforward control, and hot water filling is performed at a set temperature to the bathtub 16 via the hot water filling circuit 13 and the bath circulation circuit 15 at a sufficient flow rate for both high-temperature water and water supply.

  Next, the freezing prevention mode of the hot water filling circuit 13 will be described with reference to the flowchart of FIG. 3. When the hot water filling and hot water are finished, the bath mixing valve 10 is described in the schematic configuration diagram of FIG. 4. In addition, the bath outlet pipe 11 side is closed and the water side of the second water supply bypass pipe 12 is 100% open so that hot water is always supplied from the water at the start of hot water supply to prevent burns. In the flowchart, it is determined in step 45 whether or not a predetermined time of 5 minutes has elapsed, and if YES, the process proceeds to step 46 to determine whether or not the outside air temperature detected by the outside air temperature sensor 32 is 3 ° C. or more. Proceeding to step 47, there is no concern about freezing prevention, so the bath mixing valve 10 is left in the current water side 100% open state, returning to step 45 and waiting for the count. Than is.

  If NO in step 46, the process proceeds to step 48 to determine whether or not the outside air temperature detected by the outside air temperature sensor 32 is less than 3 ° C. If NO, an error occurs in step 49 and the outside air temperature sensor 32 is in an abnormal state. If YES, the process proceeds to step 50, where there is a risk of freezing. Therefore, the bath mixing valve 10 is switched to the hot water side 100% open state, which is described in the schematic configuration diagram of FIG. As shown in the figure, the hot water supply pipe 11 and the hot water filling circuit 13 are in communication with each other, so that the high-temperature water in the upper part of the hot water storage tank 1 flows through the hot water hot water discharge pipe 11 to the hot water filling circuit 13 by natural convection. Freezing of the hot water filling circuit 13 is prevented, and heat conduction and heat dissipation from the hot water filling circuit 13 also prevent the freezing of the hopper unit 30 such as the hot water filling electromagnetic valve 18 at the same time. It is those that can be used with confidence.

  Here, the freeze prevention temperature is detected by the outside air temperature detection by the outside air temperature sensor 32, but the freezing danger temperature may be detected by the water supply temperature detected by the water supply thermistor 33.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Heating means 3 Water supply pipe 4 Hot water supply pipe 5 Hot water supply mixing valve 6 1st water supply bypass pipe 10 Bath mixing valve 11 Bath hot water supply pipe 12 Second water supply bypass pipe 13 Hot water supply circuit 15 Bath circulation circuit 16 Bath 17 Hot water flow Sensor 18 Filled solenoid valve 19, 20 Check valve 30 Hopper unit 31 Control means

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 lower part of the hot water storage tank, and a hot water discharge pipe for discharging hot water to the upper part of the hot water storage tank are connected. A hot water mixing valve for mixing hot water discharged from the hot water and water supplied from a first water supply bypass pipe branched from the water supply pipe to supply hot water at a set temperature; and hot water from a bath hot water pipe branched from the hot water pipe; A bath mixing valve that mixes with the water supply pipe or the water supply from the second water supply bypass pipe branched from the first water supply bypass pipe to perform hot water supply at a set temperature, and further supplies the bath hot water from the bath mixing valve. The hot water filling circuit supplied to the bathtub through the circulation circuit includes a hopper unit consisting of a hot water flow sensor, a hot water solenoid valve, and two check valves, and the bath mixing valve is stopped. Freezing outside temperature Upon reaching the prevention temperature, storage-type water heater, characterized in that the water-side open state is controlled by the control means so communicates with the hot water filling circuit in a water-side open state.

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