JP5165517B2 - Hot water storage water heater with built-in bath pressure pump - Google Patents

Description

  The present invention relates to a hot water storage type hot water heater having a built-in bath pressurizing pump.

  Conventionally, in a hot water storage type hot water heater with a built-in hot water pressurizing pump of this type, hot water from a hot water storage tank and water from a water supply pipe are mixed with a mixing valve so that the hot water supply set temperature is reached, This is pressurized by a hot water pressurizing pump provided in the middle of the hot water supply pipe and supplied to the faucet. In this hot water pressurizing pump, the flow rate sensor provided in the hot water supply pipe detects a certain flow rate or more. Then, the operation is started and the operation is stopped when a certain flow rate or less is detected. A check valve is provided on the discharge side of the hot water pressurizing pump and the pressure is increased by the hot water pressurizing pump between the faucet and the check valve. The pressure was sealed to increase the hot water supply pressure from the beginning of the hot water supply. (See Patent Document 1)

  In addition, there has been an attempt to improve usability by increasing the capacity of the hot water supply pressure pump as the flow rate increases in accordance with the flow rate detected by the flow sensor. (See Patent Document 2)

JP 2007-263394 A JP 2007-24392A

  By the way, in this conventional type, a pressurizing pump is prepared for hot water supply that requires a relatively short driving time. Conversely, in a hot water filled with hot water in a large capacity bathtub, only the supply water pressure is used. Recently, it is not uncommon to have bathrooms on the 2nd and 3rd floors. In such cases, it can take a long time to fill the bath, or it cannot be used in places where the water pressure is low. There was a problem.

  To solve this problem, simply installing a pressure pump for the bath, the capacity of the bath pressure pump required for filling the bathtub on the second floor and the hot water for the bathtub installed on the third floor. Different from the capacity of the bath pressure pump required for tensioning, preparing different hot water heaters that differ only in the capacity of the bath pressure pump increases the number of models and is inefficient. It is also possible to limit the number of models so that it is also used on the second floor, but considering noise and energy saving, this is not a good idea, and without being restricted by the situation of the installation site, One of the major challenges was to provide equipment that could clear the restrictions of the installation site.

  In order to solve the above-described problems, the present invention has a configuration, in particular, 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 the water supply pipe A bath water supply bypass pipe branched from the bath, a bath mixing valve for mixing the hot water from the hot water supply pipe and the water from the bath water supply bypass pipe, and a hot water filling pipe for supplying hot water from the bath mixing valve to the bathtub A pressure sensor provided in the middle of the hot water pipe to detect the installation height of the bathtub, and a bath pressurizing pump provided in the middle of the hot water pipe to pressurize and supply hot water to the bathtub And a height detection mode for detecting the installation height of the bathtub by the pressure sensor after completion of the filling to the bathtub via the hot water filling pipe, and the bathtub installation height detected in this height detection mode. Depending on the preset Those with the ability setting means for setting a pumping capacity of the bath pressurizing pump.

  According to the present invention, the capacity of the hot water bath pressurizing pump is set in a wide range in advance, and the height detection mode is activated during the trial operation after the installation of the appliance, and the bath is supplied to the bathtub through the hot water pipe. After the completion of filling, the pressure sensor detects the installation height of the bathtub, and the number of revolutions, which is the optimum capacity of the bath pressurization pump, is determined from this height. After that, the filling operation is performed at the determined number of revolutions. Therefore, there is no wasteful capacity and there is no worry about noise, and the hot water filling with the capacity of the bath pressure pump suitable for the installation height is always carried out smoothly without difficulty, and it is extremely easy and accurate at the installation site. The necessary pumping capacity is set, so it is convenient and efficient.

Next, an embodiment of the present invention will be described with reference to the drawings.
This hot water storage type hot water heater boils and stores hot water in the midnight hours when the unit price of contract power by time 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 the hot water in the hot water storage tank 2, 4 is a faucet provided in a kitchen or a washroom, and 5 is a hot water supply provided in the vicinity of the faucet 4 A remote control, 6 is a bathtub, and 7 is a bath remote control provided in the bathroom.

  The hot water storage tank 2 of the hot water storage tank unit 1 has a hot water discharge pipe 8 connected to the upper end, a water supply pipe 9 connected to the lower end, a heat pump forward pipe 10 constituting a heat pump circulation circuit in the lower part, and a heat pump circulation circuit in the upper part. The hot water return pipe 11 is connected, the hot water in the hot water storage tank 2 taken out from the heat pump forward pipe 10 is boiled by the heat pump unit 3, returned from the heat pump return pipe 11 to the hot water storage tank 2, and stored in the hot water supply pipe 9. The hot water in the hot water storage tank 2 is pushed up by the water supply from the hot water, and the hot water in the upper part of the hot water storage tank 2 is pushed out from the hot water discharge pipe 8 to supply hot water. In the middle of the water supply pipe 9, a pressure reducing valve 12 for reducing the water supply pressure of the city water to a predetermined pressure and a water supply temperature sensor 13 for detecting the water supply temperature are provided. An overpressure relief valve 14 for releasing the overpressure is provided.

  The heat pump unit 3 supplies a compressor 15, a refrigerant-water heat exchanger 16 as a condenser, an electronic expansion valve 17, a forced air-cooled evaporator 18, and hot water in the hot water storage tank 2. A heat pump circulating pump 20 that circulates to the refrigerant-water heat exchanger 16 through the heat pump forward pipe 10 and the heat pump return pipe 11 and a heat pump control unit 21 that controls driving thereof are provided. Is one in which carbon dioxide is used as a refrigerant to constitute 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.

  Reference numeral 22 denotes a heat exchanger made of a stainless steel snake pipe for heating the hot water in the bathtub 6, and a bath return pipe 25 having a bath outlet pipe 23 and a bath circulation pump 24 is connected to the heat exchanger 22. Hot water in the bathtub 6 can be circulated, and the hot water in the bathtub 6 is heated by the high-temperature water in the hot water storage tank 2 so as to be kept warm or chased. Reference numeral 26 denotes a bath temperature sensor for detecting the temperature of hot water in the bathtub 6 circulating through the bath return pipe 25.

  Reference numeral 27 denotes a hot water mixing valve composed of an electric mixing valve that mixes hot water from the hot water supply pipe 8 and low temperature water from the hot water supply / water supply bypass pipe 28 branched from the water supply pipe 9, and is provided in the hot water supply pipe 29 downstream thereof. The mixing ratio is controlled so that the hot water temperature detected by the hot water temperature sensor 30 becomes the hot water set temperature set by the user using the hot water remote controller 5 or the bath remote controller 7.

  Reference numeral 31 is a hot water pressurizing pump provided in the middle of the hot water supply pipe 29 for boosting hot water and supplying it to the faucet 4, and 32 is a flow that flows backward through the hot water supply pipe 29 provided on the suction side of the hot water supply pressurizing pump 31. A check valve 33 for shutting off the hot water is a hot water flow rate counter for counting the hot water flow rate.

  34 is a bath mixing valve composed of an electric mixing valve that mixes hot water from the branch hot water pipe 35 branched from the hot water pipe 8 and low temperature water from the bath water supply bypass pipe 36 branched from the water supply pipe 9; Mixing so that the hot water temperature detected by the hot water temperature sensor 38 provided in the hot water temperature tube 38 communicated with the downstream bath return pipe 25 becomes the bath set temperature set by the user with the hot water remote controller 5 or the bath remote controller 7. The ratio is controlled.

  The hot water filling pipe 37 includes a hot water filling valve 39 for starting / stopping hot water filling to the bathtub 6, a bath flow rate counter 40 for counting the amount of hot water filling to the bathtub 6, and bath water from the bathtub 6. The hot water check valve 41 for preventing the back flow of the water is double provided, and the bath pressurizing pump 42 for pressurizing the hot water and filling the hot water is provided. Is equipped with a pressure sensor 43, and after the hot water filling valve 39 is closed in the height detection mode, the water pressure acting in the hot water filling pipe 37 is detected, so that the capacity of the subsequent bath pressurizing pump 42 is improved. The pressure sensor 43 may also be used as a sensor for checking the water level of the bathtub 6.

  A plurality of hot water storage temperature sensors 44 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 44 a, 44 b, 44 c, 44 d, 44 e from the top. Is used to detect how much heat is left in the hot water storage tank 2 and to detect the temperature distribution in the vertical direction in the hot water storage tank 2.

  The hot water remote controller 5 and the bath remote controller 7 are respectively provided with a hot water supply temperature setting switch 45 for setting a hot water supply set temperature and a bath temperature setting switch 46 for setting a bath set temperature. The bath remote switch 7 is provided with an automatic bath switch 47 that fills the hot water by a hot water amount set by a hot water amount setting switch (not shown) of the bath remote control 7 and keeps it warm for a predetermined time. A hot water hot water switch 48 for hot hot water is provided, and when the hot water temperature setting switch 45 and the bath automatic switch 47 of the hot water remote controller 5 are pressed simultaneously for 5 seconds or longer, a test operation mode is set. Water supply to the tank 2 and water supply in the hot water storage tank 2 from the heat pump forward pipe 10 through the heat pump unit 3 to the heat pump return pipe 1 from back in the hot water storage tank 2 circulation, by or through the water in the hot water storage tank 2 to the hot water supply pipe 29, in which automatically try the connection state of the pipe.

  A hot water supply control unit 49 includes a microcomputer that receives the input of each sensor in the hot water storage tank unit 1 and controls driving of each actuator, and constitutes a control unit. The hot-water supply remote controller 5 is connected to the hot-water supply control unit 49 wirelessly or by wire so that the user can set an arbitrary hot-water supply set temperature and bath set temperature.

  The hot water supply control unit 49 feedback-controls the opening degree of the hot water supply mixing valve 27 so that the temperature detected by the hot water supply temperature sensor 30 becomes the hot water supply set temperature, and the temperature detected by the hot water temperature sensor 38. The valve opening degree of the bath mixing valve 34 is feedback-controlled so that becomes the bath set temperature.

The hot water supply control unit 49 is provided with a capacity setting means 50 for setting the pump capacity of the bath pressurizing pump 42, and the hot water supply to the bathtub 6 is finished filling through the hot water filling pipe 37 following the trial operation mode. Later, the ability setting means 50 selects the ability of the bath pressurizing pump 42 according to the height detected in the height detection mode for detecting the height of the bathtub 6 by the pressure sensor 43. This ability setting means 50 is a pressure conversion means 51 for converting the detected pressure from the pressure sensor 43 from a voltage value to a pressure value, and a rotation speed calculation for calculating the rotation speed of the bath pressurizing pump 42 by substituting this pressure value into the following equation. Part 52;

α = (P + B) / A

α: Number of rotations of the bath pressure pump (rpm) P: Detection pressure value (Pa) A: Coefficient (value determined by the pump capacity to be used) B: Coefficient (value determined by the pressure loss in the instrument to be used)

The pump control unit 53 controls the bath pressurizing pump 42 at the calculated number of revolutions.

  Further, when the bath automatic switch 47 is operated to fill the bathtub 6 with hot water, the hot water supply control unit 49 opens the hot water filling valve 39 and starts the operation of the bath pressurizing pump 42. 39 is closed and the bath pressurizing pump 42 is stopped.

Next, the operation of this embodiment will be described.
After the installation of the appliance is completed, the hot water temperature setting switch 45 and the bath automatic switch 47 of the hot water remote controller 5 are simultaneously pressed for 5 seconds or more to enter the trial operation mode. The pipe is connected to the hot water tank 2 through the heat pump unit 3 through the heat pump unit 3 and returned to the hot water tank 2 through the hot water supply pipe 29. is there.

Then, at the end of the trial operation mode, the height detection mode is entered, and the bathtub 6 is opened until the hot water filling valve 39 is opened and the bath flow counter 40 counts a predetermined flow rate from the hot water filling pipe 37 through the bath return pipe 25. After supplying the water as hot water of the hot water storage tank 2 to the place where the circulation port of the bathtub 6 is submerged, the height of the bathtub 6 is detected by the pressure sensor 43 and the capacity of the bath pressurizing pump 42 is set as the capacity setting means 50. In other words, when the height to the bathtub 6 is 7 m, the pressure sensor 43 detects this, and the pressure conversion means 51 converts the pressure value to P = 7 m = 68600 Pa, and calculates the rotation speed. The above formula is calculated by the unit 52,
The coefficient A is set to 21.7 Pa / rpm, and the coefficient B is set to 9500 Pa.
α = (68600 Pa + 9500 Pa) /21.7 Pa / rpm

Thus, the rotation speed α of the bath pressurizing pump is 3599 = (nearly equal) 3600 rpm, and the pump control section 53 controls the rotation speed of the bath pressurizing pump 42 to 3600 rpm.

  Next, the heating operation will be described. When the hot water storage temperature sensor 44 detects that the necessary amount of heat does not remain in the hot water storage tank 2 the next day in the midnight power time zone, the hot water supply control unit 49 notifies the heat pump control unit 21. In response, a boiling start command is issued. Upon receiving the command, the heat pump controller 21 starts driving the heat pump circulation pump 20 after starting the compressor 15, and cools the low temperature water of about 5 to 20 ° C. taken out from the heat pump forward pipe 10 connected to the lower part of the hot water storage tank 2 as a refrigerant. -Heated to a high temperature of about 70 to 90 ° C by the water heat exchanger 16, returned to the hot water storage tank 2 from the heat pump return pipe 11 connected to the upper part of the hot water storage tank 2, and stacked in order from the upper part of the hot water storage tank 2 Store hot water. When the hot water storage temperature sensor 44 detects that the required amount of heat has been stored, the hot water supply control unit 49 issues a boiling stop command to the heat pump control unit 21, and the heat pump control unit 21 stops the compressor 15 and heat pump circulation. The pump 20 is also stopped and the boiling operation is finished.

  The hot water filling operation to the bathtub 6 will be described. When either the hot water remote controller 5 or the bath automatic switch 47 of the bath remote controller 7 is operated, the hot water controller 49 opens the hot water valve 39. Then, the water supply from the water supply pipe 9 flows into the hot water storage tank 2. Then, hot water in the hot water storage tank 2 is pushed out to the bath mixing valve 34 through the hot water supply pipe 8 and the branched hot water supply pipe 35 and mixed with low temperature water from the bath water supply bypass pipe 36, and the hot water supply control unit 49 is connected to the bath mixing valve 34. Bath 6 installed at a height of 7 m from hot water filled pipe 37 through bath return pipe 25 by adjusting the mixing ratio and hot water of bath set temperature being pressurized by bath pressurizing pump 42 controlled at 3600 rpm. It will be well filled with hot water.

  Thus, since the capacity of the bath pressurizing pump 42 corresponding to the installation height of the bathtub 6 can be obtained, a suitable pump capacity can be obtained without excess or deficiency, and an abnormally loud noise or a strong shower can be obtained. Since there is no problem such as absence, it can be used with peace of mind, and after the test run at the time of construction, the installation height is detected by the pressure sensor 43 and the capacity of the bath pressurizing pump 42 is determined by the capacity setting means 50. The pump capacity is set at the same time as various settings, and it is very convenient to use. From the start of use, it is possible to take a comfortable bath with good hot water filling, and multiple models with different bath pressurizing pump capabilities are available. It is extremely efficient and energy saving.

  In this embodiment, the pumping capacity is determined by detecting the installation height of the bathtub 6 following the trial operation at the time of construction. However, the present invention is not limited to this. For example, the first hot water filling after the hot water storage operation is performed. The hot water filling valve 39 is opened and the hot water of the hot water storage tank 2 is submerged in the bathtub 6 from the hot water filling pipe 37 to the bathtub 6 via the bath return pipe 25. After the hot water is filled, the height of the bathtub 6 is detected by the pressure sensor 43, and the capacity of the bath pressurizing pump 42 is determined by the capacity setting means 50, whereby the difference in pressure value due to temperature is the same. Can be eliminated by detecting the pressure sensor 43, more accurately detecting the installation height of the bathtub 6 and setting a more suitable pumping capacity. Re-detect the installation height By updating the capacity, it is possible to keep the optimal capacity of the bath pressurizing pump 42 corresponding to the pressure loss in the pipe that changes with time, and can be used extremely easily. It is.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram which shows the hot water storage type hot water heater with a built-in bath pressurization pump of one Embodiment of this invention. The principal part block diagram of the same electric circuit. The schematic explanatory drawing of the principal part. The flowchart of the same height detection mode.

Explanation of symbols

2 Hot Water Storage Tank 6 Bath 8 Hot Water Pipe 9 Water Supply Pipe 29 Hot Water Supply Pipe 34 Bath Mixing Valve 36 Bath Water Supply Bypass Pipe 37 Hot Water Filling Pipe 42 Pressure Sensor 43 Bath Pressure Pump 49 Hot Water Supply Control Unit 50 Capacity Setting 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, a bath water supply bypass pipe branched from the water supply pipe, and a hot water supply pipe from the hot water supply pipe A bath mixing valve that mixes hot water with water from the bath water supply bypass pipe, a hot water pipe that supplies hot water from the bath mixing valve to the bathtub, and the height of the bathtub that is provided in the middle of the hot water pipe What is provided with a pressure sensor for detection and a bath pressurizing pump provided in the middle of the hot water filling pipe for boosting hot water and supplying the hot water to the bathtub, the hot water to the bathtub via the hot water filling pipe After completion of tensioning, it is equipped with a height detection mode that detects the installation height of the bathtub by the pressure sensor, and the pump capacity of the bath pressurization pump set in advance according to the bathtub installation height detected in this height detection mode Ability setting means to set Bath pressure pump built-in hot-water storage type water heater, characterized in that with.

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