JP2013160451A - Hot water storage type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water storage type water heater capable of detecting water stoppage at a low cost.SOLUTION: A hot water storage type water heater includes a hot water storage tank 1 to store hot water, a water supply pipe 2 to supply water into the hot water storage tank 1, a hot water output pipe 3 to output hot water from the hot water storage tank 1, a heating means 14 to heat up the hot water in the hot water storage tank 1, a bypass pipe 4 branched from the water supply pipe 2 to merge the hot water output pipe 3, a mixing valve 5 provided at a juncture of the hot water output pipe 3 and the bypass pipe 4 to regulate a mixing ratio of the hot water, a hot water supply temperature sensor 8 to detect a temperature of the hot water supplied from the mixing valve 5, a hot water supply flow amount counter 9 which detects the presence or absence of the hot water supplied from the mixing valve 5 to operate a hot water supply pressurization pump 10, and a control means 21 to control the mixing valve 5 or the hot water supply pressurization pump 10. When the hot water supply temperature sensor 8 detects that the hot water supply temperature is a predetermined value or higher during hot water supply, the control means 21 decides water stoppage and stops the hot water supply pressurization pump 10.

Description

  The present invention relates to a hot water storage type hot water supply apparatus that supplies hot water by pumping hot water stored in a hot water storage tank.

  Conventionally, in this type of hot water storage type hot water supply device using a hot water supply pressurizing pump, when water breakage occurs during hot water supply, this cannot be detected, and the hot water pressure is lost and hot water supply cannot be supplied. Since the pressurization pump continues to drive, there is a danger that the hot water supply tank will be damaged due to negative pressure, and in order to prevent this, a pressure sensor is installed to detect water breakage and stop driving the hot water supply pressurization pump Met.

JP 2007-263394 A

  By the way, with these conventional ones, it is necessary to provide a special pressure sensor for detecting water breakage, which increases the cost, and it is certain to use the existing one without using a special sensor. Whether or not it can be detected at low cost was a major issue.

  In order to solve the above-mentioned problems, the present invention has, in particular, a configuration comprising a hot water storage tank for storing hot water, a water supply pipe for supplying water to the hot water storage tank, a hot water discharge pipe for discharging hot water from the hot water storage tank, and hot water in the hot water storage tank. Heating means for heating; a bypass pipe branched from the water supply pipe and joined to the hot water pipe; a mixing valve provided at a junction of the hot water pipe and the bypass pipe to adjust a mixing ratio of hot water; and the mixing A hot water temperature sensor for detecting the temperature of hot water supplied from the valve, a hot water flow rate counter for detecting the presence or absence of hot water from the mixing valve and starting a hot water pressurizing pump, and the mixing valve and hot water pressurizing pump And a control means for controlling the temperature of the hot water supply temperature detected by the hot water temperature sensor during the hot water supply, the hot water pressure sensor detects that the water supply has stopped and stops the hot water supply pressure pump. What A.

  As described above, according to the present invention, the supply of water supply is stopped due to water supply interruption during hot water supply, and a rapid increase in generated hot water temperature is detected by the hot water supply temperature sensor. Since the pressure pump is stopped, a special sensor is not required, it can be reliably detected by the existing hot water temperature sensor, and it is inexpensive, and it can reliably prevent damage to the hot water storage tank due to water outage. .

The schematic block diagram of the hot water storage type hot water supply apparatus of one Embodiment of this invention. The flowchart of the water-stop detection in the hot water supply. The characteristic view of the hot-water supply temperature detection of the hot-water supply temperature sensor.

Next, an embodiment of the present invention will be described with reference to the drawings.
1 is a stainless steel hot water storage tank for storing hot water, 2 is a water supply pipe for supplying city water to the bottom of the hot water storage tank 1, 3 is a hot water discharge pipe for discharging hot water from the top of the hot water storage tank 1, and 4 is a bypass pipe branched from the water supply pipe 2 5 is a mixing valve that mixes the hot water from the outlet pipe 3 and the water from the bypass pipe 4 so as to reach a hot water setting temperature that is a scheduled hot water supply temperature, and 6 is a hot water supply pipe through which the hot water mixed by the mixing valve 5 flows. , 7 is a hot water tap for supplying hot water from the hot water supply pipe 6, 8 is a hot water temperature sensor for detecting the hot water temperature provided in the middle of the hot water pipe 6, and 9 is provided in the middle of the hot water pipe 6 for counting the presence or absence of hot water and the flow rate of hot water The hot water supply flow rate counter 10 is a hot water supply pressure pump that starts driving when hot water supply detection of the hot water supply flow rate counter 9 is detected and stops driving when hot water supply stop is detected, 11 is a water supply temperature sensor that is provided in the bypass pipe 4 and detects the temperature of water supply, and 12 is water supply Provided in tube 2 Reducing valve for reducing the supply pressure of the water at a constant pressure, 13 overpressure relief for releasing overpressure in the hot water storage tank 1 is is valve, These are housed in the outer body 14.

  15 is a heat pump heating means as a heating means for heating the hot water in the hot water storage tank 1, a compressor for compressing the refrigerant (not shown), a refrigerant water heat exchanger for exchanging heat between the refrigerant and water, and the pressure of the refrigerant. A decompressor for reducing the pressure and an evaporator for evaporating the liquid refrigerant are connected in a ring shape, and the low-temperature and low-pressure refrigerant absorbed by the evaporator is compressed by the compressor, and the high-temperature and high-pressure is obtained via the refrigerant water heat exchanger. The hot water is heated by exchanging heat between the refrigerant and water.

  Reference numeral 16 denotes a heating circuit that connects the lower part of the hot water storage tank 1, the water side of the refrigerant water heat exchanger in the heat pump type heating means 15, and the upper part of the hot water storage tank 1 so that hot water can circulate, and is taken out from the lower part of the hot water storage tank 1. After the heated low-temperature water is heated to a high temperature by the heat pump heating means 15, the hot water is stored so as to be returned to the hot water storage tank 1 from the upper part of the hot water storage tank 1.

  Reference numeral 17 denotes a remote controller, which includes a display unit 18 for displaying various information related to the hot water supply device (hot water supply set temperature, remaining hot water amount, operating state of the hot water supply device, etc.), a temperature setting switch 19 for setting and operating the hot water supply set temperature, And a sound generator 20 for generating sounds such as sounds and warning sounds.

  21 is inputted with detection values of the hot water temperature sensor 8, the hot water flow rate counter 9, and the hot water temperature sensor 11, and controls the operation of the mixing valve 5, the hot water pressure pump 10 and the heat pump heating means 15 and can communicate with the remote controller 17. It is the control means connected to. The control means 21 stores in advance a program for controlling the operation of the hot water supply device, and has a calculation, comparison, storage function, and clock function.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG.
The heat pump type heating means 15 is driven with the contract power of midnight now, the hot water in the hot water tank 1 is heated by the heating circulation circuit 16, and the hot water tank 1 is filled with hot water the next morning. When the hot water tap 7 is opened in step S1, hot water can flow in the hot water supply pipe 6, and the hot water flow rate counter 9 counts the predetermined flow rate T in step S2. While starting the driving, the mixing valve 5 is controlled so that the detected temperature of the hot water supply temperature sensor 8 becomes the hot water supply set temperature, and hot water supply is started.

  During hot water supply, as shown in step S4, the hot water temperature sensor 8 detects the hot water supply temperature by the control means 21, and when this temperature detects a predetermined value equal to or higher than the hot water supply temperature + 5 ° C., it is determined that water breakage has occurred. If YES, the process proceeds to step S5 to stop the hot water supply pressurizing pump 10 and stop the hot water supply in an emergency manner, thereby preventing the risk of burns and the like due to the high temperature hot water outflow.

  This is because, as shown in FIG. 3, when water is cut off during hot water supply, the water supplied to the mixing valve 5 from the bypass pipe 4 is stopped, and the water supply pressure to the hot water storage tank 1 is also stopped. However, since the hot water remaining in the pipe for a while is supplied with hot water by the suction force of the hot water pressurizing pump 10, the hot water temperature becomes a mountain shape like A and rises above a predetermined value. By detecting this with the hot water supply temperature sensor 8, the water pressure is detected to stop the drive of the hot water supply pressure pump 10, so that the negative pressure of the hot water storage tank 1 generated by the drive of the hot water supply pressure pump 10 after the water supply is stopped. By using the existing hot water supply temperature sensor 8, damage can be reliably prevented while being low-cost and inexpensive, and can be used with confidence.

  In addition, by using the hot water supply pressurizing pump 10, hot water supply is smoothly performed at a place where the water pressure is low, hot water supply on the second floor, third floor, and hot water filling in the bath on the second floor, third floor, etc. Has a great merit that it is performed well in a short time.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Water supply pipe 3 Hot water discharge pipe 4 Bypass pipe 5 Mixing valve 6 Hot water supply pipe 8 Hot water supply temperature sensor 9 Hot water supply flow rate counter 10 Hot water supply pressure pump 14 Heat pump type heating means (heating means)
21 Control means

Claims (1)

  A hot water storage tank for storing hot water, a water supply pipe for supplying water to the hot water storage tank, a hot water discharge pipe for discharging hot water from the hot water storage tank, heating means for heating the hot water in the hot water storage tank, and the hot water branched off from the water supply pipe A bypass pipe that joins the pipe, a mixing valve that is provided at the junction of the hot water pipe and the bypass pipe, and that adjusts the mixing ratio of hot water, and a hot water supply temperature sensor that detects the temperature of hot water supplied from the mixing valve And a hot water flow rate counter for detecting the presence or absence of hot water supply from the mixing valve and setting up a hot water pressure pump, and a control means for controlling the mixing valve and the hot water pressure pump. A hot water storage type hot water supply apparatus characterized in that the hot water temperature detected by the hot water supply temperature sensor becomes equal to or higher than a predetermined value during the hot water supply, and the control means determines that the water supply has stopped and stops the hot water supply pressure pump.

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