JP2010139141A - Storage type hot water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage type hot water supply device capable of safely supplying hot water even if a hot-water supply flow sensor gets out of order. <P>SOLUTION: When the hot-water supply flow sensor is broken down and unable to detect start/stop of supplying hot water, the start of supplying hot water is detected by reduction in detected temperature by a hot-water supply thermistor by predetermined degrees of temperature during a predetermined time, and the stop of supplying hot water is detected by temperature rise by predetermined degrees of temperature during a predetermined time. Accordingly, the start/stop of supplying hot water can be securely detected, and the device can be used at ease without worrying about burns, etc., even when the hot-water supply flow sensor gets out of order. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hot water storage type hot water supply apparatus that mixes hot water in a hot water storage tank with hot water using a hot water supply mixing valve to supply hot water.

Conventionally, with this type of device, when the reset signal of the reset switch is input, it is determined that the hot water flow sensor has failed and the detected temperature of the hot water thermistor matches the set temperature regardless of the detection result of the hot water flow sensor. The hot water mixing valve was controlled so that hot water could be supplied even when the hot water flow sensor failed. (For example, see Patent Document 1)
JP 2005-337582 A

  By the way, with this conventional one, it is troublesome to press the reset switch when starting hot water supply, and the stop switch when stopping, and if you forget the stop switch, hot water is discharged and burns. There was also danger.

  Therefore, in order to solve the above problems, the present invention is particularly connected to the hot water storage tank for storing hot water heated by the heating means, the hot water pipe connected to the upper end of the hot water storage tank, and the lower end of the hot water storage tank. A hot water mixing valve that mixes hot water from the hot water discharge pipe and hot water from the hot water supply pipe and feeds water from a water supply bypass pipe to supply hot water at a set temperature from the hot water supply pipe, and a faucet provided at the tip of the hot water supply pipe The hot water supply flow sensor that detects the start and stop of hot water supply by opening and closing the hot water in the hot water pipe and the hot water temperature by the hot water mixing valve are detected, and the hot water control unit is set so that this temperature becomes the set hot water temperature by the remote controller. The hot water supply thermistor controlled via the hot water supply mixing valve is stopped at the hot water supply side 100% opening when hot water supply is stopped. If not, the temperature detected by the hot water thermistor is detected to decrease by a predetermined temperature during a predetermined time to detect the start of hot water supply, and the temperature rises to a predetermined temperature during a predetermined time to detect the stop of hot water. It is.

  According to the present invention, when the hot water flow sensor breaks down, a delicate temperature change in the hot water pipe is detected by the hot water thermistor to control the start and stop of the hot water supply. It is automatically performed only by opening and closing, and it is very convenient to use. Furthermore, since the hot water supply mixing valve is 100% on the water supply side, the hot water supply is started by the flow of water supply by opening the faucet. The temperature detection of the thermistor changes to detect the start of hot water supply, and the hot water supply stops because the hot water mixing valve stops in a mixed state of hot water and water. The thermistor detects and moves the hot water mixing valve to 100% of the water supply side at the stop position, so it can reliably detect the start and stop of hot water supply and can be safely relieved even if the hot water flow sensor fails. It is those that can be used Te.

Next, an embodiment of the present invention will be described with reference to the drawings.
This hot water storage type hot water supply apparatus boils and stores hot water in the midnight hours when the unit price of contracted power by time zone is low, and uses the hot water stored for hot water supply. 1 is a hot water storage tank 2 for storing hot water. 3 is a heat pump unit as a heating means for heating hot water in the hot water storage tank 2, 4 is a faucet provided in a kitchen or a washroom, etc. 5 is a remote control for remotely operating this hot water storage hot water supply device , 6 is a bathtub.

  The hot water storage tank 2 of the hot water storage tank unit 1 has a hot water discharge pipe 7 connected to the upper end, a water supply pipe 8 connected to the lower end, an outgoing pipe 9 constituting a heat pump circulation circuit at the lower portion, and a heat pump circulation circuit at the upper end. Connected to the return pipe 10, the hot water in the hot water storage tank 2 taken out from the forward pipe 9 is boiled by the heat pump unit 3, returned to the hot water storage tank 2 from the return pipe 10, and stored in hot water. Hot water in the hot water storage tank 2 is pushed up, and hot water in the upper part of the hot water storage tank 2 is pushed out from the hot water discharge pipe 7 to supply hot water.

  The heat pump unit 3 includes a compressor 11, a refrigerant-water heat exchanger 12 as a condenser, an electronic expansion valve 13, a forced air-cooled evaporator 14, and hot water in the hot water storage tank 2. A heating circulation pump 16 that circulates to the refrigerant-water heat exchanger 12 through the forward pipe 9 and the return pipe 10 and a heat pump control unit 17 that controls 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.

  Here, the refrigerant-water heat exchanger 12 employs a counter flow system in which the refrigerant and hot water in the hot water storage tank 2 that is heated water are opposed to each other. In the supercritical heat pump cycle, the refrigerant is exchanged during heat exchange. Since it is condensed in the supercritical state, the water to be heated can be efficiently heated to a high temperature so that the temperature difference between the refrigerant-water heat exchanger 12 inlet temperature and the refrigerant outlet temperature becomes constant. Further, by controlling the electronic expansion valve 12 or the compressor 11, the water to be heated can be heated in a state where the COP (energy consumption efficiency) is very good.

  Next, 18 is a bath heat exchanger composed of a stainless steel snake pipe for heating the hot water in the bathtub 6, which is arranged at the upper part in the hot water storage tank 2, and the bath heat exchanger 18 is connected to the bath heat exchanger 18. A bath circulation circuit 22 composed of a pipe 19 and a bath return pipe 21 provided with a bath circulation pump 20 is connected so that hot water in the bathtub 6 can be circulated, and hot water in the bathtub 6 is heated by high-temperature water in the hot water storage tank 2. Insulation or chasing is performed.

  If the amount of heat in the hot water storage tank 2 is insufficient at the time of heat insulation or reheating, the heating pump unit 3 performs a boiling operation. At this time, the heated hot water is not the return pipe 10 but the bath heat exchanger. 18 is returned via an intermediate return pipe 23 communicated with the upper part of the hot water storage tank 2 facing the pipe 18, and a three-way valve 24 constituting a flow path switching means is provided at a branch portion between the return pipe 10 and the intermediate return pipe 23. The three-way valve 24 is provided so that the return pipe 10 is selected in the heating operation during the midnight time zone, and the intermediate return pipe 23 is selected in the heating operation other than this time zone.

  A bath return temperature sensor 25 detects the temperature of the bath water flowing into the bath heat exchanger 18 through the bath return pipe 21, and 26 flows out of the bath heat exchanger 18 to the bath 6 through the bath outlet pipe 19. It is a bath temperature sensor for detecting the temperature of flowing bathtub water.

  Next, 27 is a hot water mixing valve composed of an electric mixing valve for mixing hot water from the hot water discharge pipe 7 and low temperature water from the water supply bypass pipe 28 branched from the water supply pipe 9. The mixing ratio is controlled so that the hot water temperature detected by the provided hot water supply thermistor 30 becomes the hot water supply set temperature set by the user using the remote controller 5, and 31 is provided in the hot water supply pipe 29 to detect the flow of hot water. The hot water supply flow sensor detects the start of hot water supply and the stop of hot water supply when the flow of hot water supply stops.

  Reference numeral 32 denotes a hot water filling pipe branched from the hot water supply pipe 29 and communicated with the bath return pipe 21. The hot water filling pipe 32 includes a hot water filling valve 33 for starting / stopping hot water filling to the bathtub 6, and a bathtub 6. There are provided a flow rate counter 34 for counting the amount of hot water filling and a check valve 35 for preventing the bath water from flowing back to the hot water supply pipe 29.

  Next, a plurality of hot water storage temperature sensors 36 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 36a, 36b, 36c, 36d, 36e from the top. The temperature information detected by the temperature sensor 36 detects how much heat is stored in the hot water tank 2, how much hot water remains, and how much the hot water has been replenished, and the vertical temperature distribution in the hot water tank 2 is also detected. It is something to detect.

  The remote controller 5 is provided with a hot water supply temperature setting switch 37 for setting the hot water supply set temperature and a bath temperature setting switch 38 for setting the bath set temperature, respectively. Automatic bathing that fills the amount of water filled with a water filling amount setting switch (not shown) and keeps it warm for a predetermined time and replenishes water at a predetermined temperature to the set water level when the water level in the bathtub 6 drops by a predetermined amount. A switch 39 and a reheating switch 40 that repels bathtub water are provided.

  Reference numeral 41 denotes a hot water supply control unit constituted by a microcomputer having a built-in memory, calculation, and time counting function for receiving the input of each sensor in the hot water storage tank unit 1 and controlling the drive of each actuator. The remote controller 5 is connected to the hot water supply control unit 41 by radio or wire so that the user can set an arbitrary hot water supply set temperature and bath set temperature.

  The hot water controller 41 is connected to the remote controller 5, the bath return temperature sensor 25, the bath temperature sensor 26, the hot water thermistor 30, the hot water flow sensor 31, the flow rate counter 34, the hot water storage temperature sensor 36, etc. on the input side, and on the output side. A heating circulation pump 16, a heat pump control unit 17, a bath circulation pump 20, a hot water supply mixing valve 27, and a hot water filling valve 33 are connected.

  Incidentally, 42 is a water level sensor, 43 is an overpressure relief valve for releasing the overpressure of the hot water storage tank 2, 44 is a pressure reducing valve for reducing the pressure of the water supply, and 45 is a water supply temperature sensor for detecting the temperature of the water supply.

Next, the operation of this embodiment will be described.
First, when the hot water storage temperature sensor 36 detects that the necessary amount of heat does not remain in the hot water storage tank 2 in the midnight power time zone, the hot water supply control unit 41 issues a boiling start command to the heat pump control unit 17. To emit. Upon receiving the command, the heat pump control unit 17 starts driving the compressor 11 and then starts to drive the heating circulation pump 16, and cools the low temperature water of about 5 to 20 ° C. taken out from the forward pipe 9 connected to the lower part of the hot water storage tank 2. The water heat exchanger 12 is heated to a high temperature of about 70 to 90 ° C., returned to the hot water storage tank 2 from the return pipe 10 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 to store the high temperature water. Go. When the hot water storage temperature sensor 36e detects that the necessary amount of heat has been stored, the hot water supply control unit 41 issues a boiling stop command to the heat pump control unit 17, and the heat pump control unit 17 stops the compressor 11 and performs heating circulation. The pump 16 is also stopped to end the boiling operation.

  Next, the hot water supply operation will be described. When the faucet 4 is opened, since the hot water supply mixing valve 27 is 100% on the water supply side, water supply first flows from the water supply bypass pipe 28 to the hot water supply pipe 29, and this is detected by the hot water supply flow sensor 31. Thus, the hot water supply start is detected, and the hot water supply mixing valve 27 is first feedforward controlled to the opening determined by the detected temperature of the hot water storage temperature sensor 36 and the average hot water temperature via the hot water supply control unit 41, and then the remote controller 5 The mixing ratio of the hot water and the hot water in the hot water mixing valve 27 is controlled so that the hot water temperature detected by the hot water supply thermistor 30 is equal to the hot water setting temperature set in step. The hot water supply of temperature can be obtained.

  In addition, the hot water supply is stopped by closing the faucet 4 so that the hot water flow sensor 31 detects that the hot water flow has stopped flowing in the hot water supply pipe 29, and the hot water supply mixing valve 27 is set to 100% of the water supply side via the hot water supply control unit 41. In this state, the hot water supply starts from water at the next re-heating, and the risk of burns due to discharge of high-temperature water is prevented.

Next, the start determination of the hot water supply operation in a state where the hot water supply flow sensor 31 has failed will be described with reference to the flowchart shown in FIG.
If the faucet 4 is opened in step 46 during the hot water supply waiting in FIG. 3, the process proceeds to step 47 to determine whether the hot water flow sensor 31 has detected flowing water. In YES, the above hot water supply operation is performed normally. In step 48, it is determined whether or not the detected temperature of the hot water supply thermistor 30 has dropped by 5 ° C. or more in 5 seconds. That is, when no flowing water is detected by the hot water flow sensor 31, the tap 4 is opened to open the hot water mixing valve. Since water supply side 27 is 100% open on the water supply side, the water supply flows through hot water supply pipe 29. Initially, the remaining water mixed in the previous hot water supply flows into hot water supply pipe 29 and then gradually changes to water supply. Is detected by the hot water supply thermistor 30 and the start of hot water supply is determined. In step 49, the fact that the hot water flow sensor 31 is out of order is displayed on the display portion of the remote controller 5 to notify the user. By controlling the water supply operation similar hot water supply mixing valve 27 of the serial and performs hot water.

  Further, in the hot water supply stop in a state where the hot water supply flow sensor 31 in FIG. 4 is out of order, when the faucet 4 is closed in step 50, the process proceeds to step 51 to determine whether the hot water supply flow sensor 31 detects the stop of flowing water. As with the hot water supply stop, the hot water mixing valve 27 is driven to the water supply side 100% state in step 52. If NO, the process proceeds to step 53, and the detected temperature of the hot water supply thermistor 30 is increased by 5 ° C. or more in 5 seconds. That is, when there is no detection of stoppage of flowing water by the hot water supply flow sensor 31, the hot water supply mixing valve 27 is still stopped in a mixed state of hot water and water supply by closing the faucet 4. Since the high-temperature water turns around so that the mixed water immediately after closing is replaced with high-temperature water due to the difference in specific gravity, the temperature change at this time is detected by the hot water supply thermistor 30 to determine the hot water supply stop, In step 4, the fact that the hot water supply flow sensor 31 is out of order is displayed on the display portion of the remote controller 5 for notification, and the process returns to step 52 to drive the hot water supply mixing valve 27 to the state of 100% on the water supply side. is there.

  Thus, even if the hot water flow sensor 31 breaks down, it is possible to detect the start and stop of hot water supply using the hot water supply thermistor 30 for mixing adjustment of the hot water supply mixing valve 27. Therefore, another sensor hot water part should be added. In addition, it can be detected reliably at low cost, and it can be used with peace of mind without worrying about false detections at all times, using subtle changes at the time of hot water supply start and stop unique to hot water storage water heaters. is there.

The schematic block diagram 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 explaining judgment of the hot-water supply start. The flowchart explaining the determination of the hot water supply stop.

Explanation of symbols

2 Hot water storage tank 3 Heat pump unit (heating means)
4 Faucet 7 Heating Pipe 9 Water Supply Pipe 27 Hot Water Mixing Valve 29 Hot Water Pipe 30 Hot Water Thermistor 31 Hot Water Flow Sensor 41 Hot Water Control Unit

Claims (1)

  A hot water storage tank for storing hot water heated by the heating means, a hot water pipe connected to the upper end of the hot water storage tank, a water supply pipe connected to the lower end of the hot water storage tank, hot water from the hot water supply pipe and water supply branched from the water supply pipe The hot water mixing valve that mixes with the hot water from the bypass pipe to supply hot water at the set temperature from the hot water pipe, and the start and stop of hot water by opening and closing the faucet provided at the tip of the hot water pipe, with the flow of hot water in the hot water pipe A hot water supply flow sensor to detect, a hot water supply temperature detected by a hot water supply mixing valve, and a hot water supply thermistor that controls the hot water supply temperature by a hot water control unit so that this temperature becomes a set temperature of hot water supply by a remote controller, and the hot water supply mixing valve When the hot water supply flow sensor is out of order and cannot detect the start and stop of hot water supply, the temperature detected by the hot water supply thermistor is set at a predetermined time. Hot water storage type water heater, characterized in that to detect the start of the hot water supply by a predetermined temperature drop, and configured to detect the stop of the hot water by a predetermined temperature rise for a predetermined time.

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