JP4294605B2 - Heat pump water heater - Google Patents

Description

  The present invention relates to a heat pump type water heater that uses a heat pump circuit to supply hot water.

Conventionally, this type of heat pump type hot water heater uses midnight power to efficiently exchange heat between high-temperature and high-pressure refrigerant and low-temperature water, and stores hot water to be used in the hot water storage tank as hot water the next day. While mixing with water supply, hot water was supplied at a set temperature to achieve economical hot water supply. (For example, Patent Document 1)
Japanese Patent No. 3055406

  By the way, in this conventional one, the air vent plug on the heat pump side is opened to vent the air in the heating circulation circuit, and a boiling operation is performed in order to confirm whether or not this air has been completely removed. It was confirmed by actually operating normally whether it operates normally. For this reason, people must always stick, and in apartments and apartment buildings where many appliances are installed at the same time, this confirmation alone requires a lot of workers or a lot of time. However, the workability is extremely poor.

This invention pays attention to this point, and in order to solve the above problems, a heat pump circuit in which an air heat exchanger having a compressor, a water refrigerant exchanger, an expansion valve, and an outdoor fan is annularly connected by a refrigerant pipe, and hot water The hot water storage tank and the water refrigerant exchanger are communicated with each other by a heating circulation circuit including a heat pump forward pipe and a heat pump return pipe each provided with a circulation pump , and further above the hot water storage tank. Is connected to a bath circulation circuit having a bath mixing valve and a hot water solenoid valve, and a hot water tank is connected to the lower part of the hot water tank . The water supply from the lower water supply pipe is used to fill the water while drawing air from the bath circulation circuit through the hot water filling circuit, and then the water in this hot water storage tank is circulated in the heating circulation circuit by driving the circulation pump. After the air bleeding of the heating circulation circuit, in which to perform automatically a boiling commissioning by driving the heat pump circuit.

  According to this invention, after filling and filling the hot water storage tank, the heating circulation circuit is evacuated and then the boiling trial operation is automatically performed, and the boiling trial operation is terminated by detecting the rise of the hot water temperature. It is not necessary for a person to stick, and it is very easy to confirm boiling and bleeding, and it is possible to greatly reduce time waste and labor cost and is easy to use.

Next, a heat pump type water heater according to an embodiment of the present invention will be described with reference to the drawings.
Reference numeral 1 denotes a hot water storage tank unit, which internally includes a hot water storage tank 2 for storing hot water, a hot water pipe 3 connected to the upper part of the hot water storage tank 2, a water supply pipe 4 connected to the lower part of the hot water storage tank 2, and a hot water outlet. A hot water mixing valve 6 for mixing high temperature water from the pipe 3 and low temperature water from the hot water supply bypass pipe 5 branched from the water supply pipe 4, and a hot water supply pipe 7 connected downstream of the hot water mixing valve 6 are provided. A hot water supply temperature sensor 8 and a hot water supply flow switch 9 are provided.

  The hot water tank unit 1 further includes a hot water filling circuit 11 that connects the upper part of the hot water tank 2 and the bath circulation circuit 10. The hot water filling circuit 11 branches from the hot water from the hot water tank 2 and the hot water supply bypass pipe 5. A bath mixing valve 13 for mixing low-temperature water from the bath bypass pipe 12, a hot water solenoid valve 14 for opening and closing the hot water circuit 11, and a hot water flow rate counter 15 for counting the hot water amount. The bath circulation circuit 10 includes a water level sensor 16 that detects the water level of the bath, a bath circulation pump 17, a bath flow switch 18, a bath heat exchanger 19 provided in the upper part of the hot water tank 2, and the bath heat exchanger. A bath three-way valve 20 that bypasses 19 is provided.

  A heat pump unit 21 includes a compressor 22, a water-refrigerant heat exchanger 23 as a condenser, an electronic expansion valve 24, and an outdoor fan 25, and an air heat exchanger 26 as an evaporator that exchanges heat with air. A heat pump circuit 27, a circulating pump 31 for circulating hot water in the hot water storage tank 2 to the water / refrigerant heat exchanger 23 through a heating circulation circuit 30 including a heat pump forward pipe 28 and a heat pump return pipe 29, and driving thereof And a heat pump control unit 32 for controlling the carbon dioxide, and carbon dioxide is used as a refrigerant in the heat pump circuit 27 to constitute a supercritical heat pump cycle. Since carbon dioxide is used as the refrigerant, it is possible to boil low temperature water to a high temperature of about 90 ° C. without an electric heater.

  Here, the water-refrigerant heat exchanger 23 employs a counter-flow system in which the refrigerant and hot water in the hot water storage tank 2 that is heated water face each other. In the supercritical heat pump cycle, the refrigerant is super The water to be heated can be efficiently heated to a high temperature because it is condensed in the critical state, and the temperature difference between the water refrigerant heat exchanger 23 inlet temperature and the refrigerant outlet temperature is constant. By controlling the expansion valve 24 or the compressor 22, if the inlet temperature of the water-refrigerant heat exchanger 23 of the water to be heated is a low temperature of about 5 to 20 ° C., the COP (energy consumption efficiency) is very good. Heating water can be heated.

  Further, the heat pump outlet pipe 28 is provided with a water stop cock 33, and a heat return pipe 29 is provided with a return bypass valve 34. When the freeze prevention is performed, the return bypass valve 34 is connected to the water supply pipe 4 below the hot water storage tank 2. By switching to the communication on the antifreezing bypass pipe 35 side, freezing is prevented as circulation of a short circuit using the lower part in the hot water storage tank 2, and the circulation pump 31 and the return bypass valve 34 are located in the hot water storage tank unit 1. To do.

  Reference numeral 36 denotes a hot water supply control unit composed of a microcomputer, etc., which controls the heat-pump control unit 32 to control the temperature of the hot water supply, such as the heating and recirculation of the hot water storage tank 2 by the heating circuit 30, the hot water filling and reheating of the bath, and the heat insulation. The bath mixing valve 13 of the hot water filling circuit 11 is switched from the water side 100% open state to the hot water side 100% state by pressing the test operation switch 38 provided on the remote control 37, and the hot water filling is performed. The solenoid valve 14 is opened and water filling is performed using the hot water filling circuit 11 while venting the air in the hot water storage tank 2 after construction. Subsequently, the circulation pump 31 is driven to drive the heating circulation circuit 30. After performing the air bleed for a predetermined time, the boiling trial operation is performed, and the boiling target temperature at a predetermined temperature is continued for a predetermined time, thereby terminating the boiling trial operation.

  Reference numeral 39 denotes a timer configured in the hot water supply control unit 36, which starts counting when the test operation switch 38 is pressed. Here, the bath mixing valve 13 is turned on via the hot water supply control unit 36 by counting up for a predetermined time of 30 minutes. While returning to 100% of the original water side, the hot water solenoid valve 14 is closed and the hot water filling using the hot water filling circuit 11 is terminated.

  In addition to the trial operation switch 38, the remote controller 37 includes a hot water supply switch 40, a temperature setting switch 41 for setting a hot water supply set temperature, a hot water switch 42 for instructing the hot water filling to the bath, and a hot water filling for setting the hot water amount. A remote control unit 45 having a quantity setting switch 43 and further comprising a display unit 44 comprising a dot matrix type fluorescent display tube and a microcomputer for controlling the display unit 44 and communicating with the hot water supply control unit 36. Is provided.

  An inlet temperature sensor 46 is provided on the inlet side of the water-refrigerant heat exchanger 23 of the heating circuit 30 to detect the inlet temperature, and an outlet temperature sensor 47 is provided on the outlet side. Among the plurality of hot water temperature sensors 48 for detecting the hot water temperature and detecting the hot water temperature in the hot water storage tank 2 provided in the hot water storage tank 2, which of the outlet temperature sensor 47 and the uppermost hot water temperature sensor 48 is used? The boiling target temperature, here 30 ° C., is continuously detected to end the boiling trial operation.

  49 is a trial run tammer that counts the time from the start to the end of the air extraction of the heating circuit 30 and also counts the time from the start to the end of the boiling trial run. If the target temperature is not reached even after a lapse of a predetermined time of 1 to 2 hours that should reach the boiling target temperature in the trial operation, the display unit 44 of the remote control 37 may display “boiling abnormality” or notify with a buzzer. On the other hand, when the boiling trial run is completed a predetermined time before, a “boiling completion” display indicating a normal state or a buzzer is notified.

  50 is a stop cock with a check valve connected to the hot water supply pipe 7, 51 is a relief valve communicating with the top of the hot water storage tank 2, and 52 is a pressure reducing valve provided in the water supply pipe 4. A plug 53 is provided, 54 is a drain plug connected to the bottom of the hot water storage tank 2, and 55 is a drain plug connected to the heating circuit 30.

Next, the operation of this embodiment will be described.
Now that the appliance is installed and the hot water supply circuit, the bath circulation circuit 10, the water supply pipe 4, and the hot water supply pipe 7 are connected to each other by piping, the construction is completed by connecting to the power source. If 38 is pressed (step 56), a test run start signal is output to the hot water supply control section 36 in YES, and the hot water supply control section 36 opens the bath mixing valve 13 of the hot water filling circuit 11 in the water side 100% open state in step 57. The hot water side solenoid valve 14 is opened at the same time as switching to the hot water side 100% state, and the timer 39 starts counting for a predetermined time, here 30 minutes.

  As a result, the air in the hot water storage tank 2 is extracted from the bath from the hot water filling circuit 11 through the bath circulation circuit 10, and the hot water filling is performed in the hot water storage tank 2 with the water supplied from the water supply pipe 4. Without providing any parts, the hot water filling circuit 11 is used to automatically bleed the air from the hot water storage tank 2 and fill it with water, which is very convenient and easy to use.

Then, when the timer 39 counts up for 30 minutes in step 58, the process proceeds to step 59 with YES to return the bath mixing valve 13 to the original water side 100% via the hot water supply control unit 36, and the hot water solenoid valve 14 Is closed and the water filling using the hot water filling circuit 11 is terminated. At this time, the remote control 37 displays “end of water filling” as well as a buzzer sound.
The 30-minute count by the timer 39 sets the time when the hot water storage tank 2 becomes full in advance in the test, and naturally the predetermined time is changed if the capacity of the hot water storage tank 7 changes.

  Next, when the stopcock 33 is opened with the display on the remote control 37 as it is, the flow proceeds to step 60 to drive the circulation pump 31 to circulate the air in the heating circulation circuit 30 and the water in the hot water storage tank 2. The extracted air is discharged to the outside of the instrument in sequence by the relief valve 51, hot water supply or hot water filling.

  Then, when the test run timer 49 has elapsed for a predetermined time of 30 minutes in step 61, the process proceeds to step 62 to stop the circulation pump 31, and further proceeds to step 63 to drive the heat pump unit 21 and to turn the circulation pump 31 on. It is driven again and the boiling trial run is automatically started.

  If the outlet temperature sensor 47 or the uppermost hot water storage temperature sensor 48 detects that the temperature of the hot water heated by the heat pump unit 21 has reached the boiling target temperature in step 64 after starting the boiling trial operation, the process returns to step 65 in YES. The advancing heat pump unit 21 and the circulation pump 31 are stopped to end the boiling trial operation, and the “boiling completion” display and a buzzer notify that the boiling operation has been normally performed.

  If NO in step 64, the process proceeds to step 66 and it is determined whether the test run timer 49 has been counted up. If YES, the heat pump unit 21 and the circulation pump 31 are forcibly stopped in step 67 and “boiling” ”Up abnormal” is displayed and this is notified with a buzzer.

  Next, in the hot water storage type hot water supply apparatus, when it is nighttime, the hot water supply control unit 36 calculates the amount of hot water storage necessary for the next day, and instructs to heat up the target hot water storage amount by the end of the nighttime period. Then, the heat pump unit 21 is operated to start driving the circulation pump 31 of the heating circulation circuit 30. Then, the hot water taken out from the lower part of the hot water storage tank 2 is heated by driving the circulation pump 31 and returned to the upper part of the hot water storage tank 2, whereby hot hot water is stored.

  When the hot water temperature sensor 48 provided on the side surface of the hot water storage tank 7 detects that a predetermined amount of hot water has been stored, the hot water supply control unit 36 instructs the heat pump unit 21 to stop the heating operation, and the circulation pump The operation of No. 31 is stopped, and the hot water storage operation is completed by the end of the night time zone.

  When a hot water tap (not shown) is opened in this state, the high-temperature water in the upper part of the hot water storage tank 2 is mixed with hot water at the hot water mixing valve 6 from the hot water outlet pipe 3 and supplied as hot water at a set temperature through the hot water pipe 7. The hot water storage tank 2 is supplied with the water supply reduced by the hot water supply from the water supply pipe 4, and pushes the hot water up and repeats this in order to achieve good hot water supply.

Next, the first other embodiment shown in FIG. 4 and FIG. 5 will be described. The same parts as those of this embodiment are given the same reference numerals and the description thereof will be omitted, and only the differences will be described.
FIG. 4 uses the bath flow switch 18 provided in the bath circulation circuit 10 in place of the timer 39 to detect the completion of water filling in the hot water storage tank 2. The bath flow switch 18 is input to the hot water supply control unit 36. Is connected to the side.

  In operation, if the trial operation switch 38 of the remote control 37 is pressed (step 56), the process proceeds to step 68 with YES, and the hot water solenoid valve 14 is opened with the bath mixing valve 13 left open at 100%. A small amount of water is supplied to the bath flow switch 18 as priming water. In step 69, the filling water flow counter 15 counts a predetermined flow rate to terminate the priming water. In YES, the processing proceeds to step 70 and the filling water solenoid valve 14 is once closed. After that, in step 71, the bath mixing valve 13 of the hot water filling circuit 11 is switched from the water side 100% open state to the hot water side 100% state, and the hot water electromagnetic valve 14 is opened to use the hot water filling circuit 11. The hot water storage tank 2 is evacuated and filled with water.

  Further, when the hot water storage tank 2 becomes full in step 72, water flows into the bath circulation circuit 10 via the hot water filling circuit 11, so that the bath flow switch 18 detects this, and proceeds to step 59 with YES to control hot water supply. The bath mixing valve 13 is returned to the original water side 100% through the section 29, and the water filling electromagnetic valve 14 is closed to terminate the water filling using the water filling circuit 11. “End” is displayed as a letter, a buzzer sound is notified, and the water flow is detected by the bath flow switch 18 to detect the completion of water filling. is there.

  If NO in step 72, the flow proceeds to step 73, and the safety timer 74 that counts the time from the start of the trial run by pressing the trial run switch 38 detects the water flow even if the bath flow switch 18 exceeds the predetermined safety time. If not, it is determined as abnormal, and the process proceeds to step 75 with YES to forcibly close the hot water solenoid valve 14 and display “water filling error” on the display unit 44 of the remote control 37 as well as a warning sound. Therefore, safety can be ensured reliably, and automatic test operation can be performed with peace of mind even if a person is not present during the test operation.

  Next, when the stopcock 33 is opened with the display on the remote control 37 as it is, the flow proceeds to step 60 to drive the circulation pump 31 to circulate the air in the heating circulation circuit 30 and the water in the hot water storage tank 2. The extracted air is discharged to the outside of the instrument in sequence by the relief valve 51, hot water supply or hot water filling.

  Then, when the test run timer 49 has elapsed for a predetermined time of 30 minutes in step 61, the process proceeds to step 62 to stop the circulation pump 31, and further proceeds to step 63 to drive the heat pump unit 21 and to turn the circulation pump 31 on. It is driven again and the boiling trial run is automatically started.

  If the outlet temperature sensor 47 or the uppermost hot water storage temperature sensor 48 detects that the temperature of the hot water heated by the heat pump unit 21 has reached the boiling target temperature in step 64 after starting the boiling trial operation, the process returns to step 65 in YES. The advancing heat pump unit 21 and the circulation pump 31 are stopped to end the boiling trial operation, and the “boiling completion” display and a buzzer notify that the boiling operation has been normally performed.

  If NO in step 64, the process proceeds to step 66 and it is determined whether the test run timer 49 has been counted up. If YES, the heat pump unit 21 and the circulation pump 31 are forcibly stopped in step 67 and “boiling” ”Up abnormal” is displayed and this is notified with a buzzer.

  Next, the second other embodiment shown in FIGS. 6 to 8 will be described in the same manner. The hot water flow rate counter 15 is eliminated, and the water supply flow rate counter is located upstream of the branch portion of the hot water supply bypass tube 5 of the water supply tube 4. The water supply flow rate counter 76 counts the amount of water flowing directly into the hot water storage tank 2 and stops it when it is full.

  If the test operation switch 38 of the remote control 37 is pressed (step 56), the process proceeds to step 68 with YES, and the hot water solenoid valve 14 is opened with the bath mixing valve 13 left open at the water side 100%. A small amount of water is supplied as priming water to the feed water flow counter 76 to prevent seizure and perform a smooth operation. In step 77, the feed water flow counter 76 counts a predetermined flow rate to terminate the priming water. If YES, the process proceeds to step 70, and once the hot water solenoid valve 14 is closed, then in step 71, the bath mixing valve 13 of the hot water circuit 11 is switched from the water side 100% open state to the hot water side 100% state, and the hot water solenoid By opening the valve 14, the hot water tank 2 is evacuated and filled with water using the hot water filling circuit 11.

  Further, the process proceeds to step 78, and the water supply flow rate counter 76 counts a preset flow rate at which the hot water storage tank 2 is full. Thus, the process proceeds to step 59 with YES, and the bath mixing valve 13 is connected to the original water via the hot water supply control unit 36. The water filling solenoid valve 14 is closed and the water filling using the water filling circuit 11 is terminated, and the remote control 37 displays “end of water filling” as a character and notifies with a buzzer sound. Since the completion of water filling is detected by detecting the flow rate flowing into the hot water storage tank 2 by the water supply flow rate counter 76, it can be reliably detected that the water filling has been completed, and can be used with great peace of mind.

  If NO at step 78, the routine proceeds to step 73, where the safety timer 74 that counts the time from the start of the trial run due to the pressing of the trial run switch 38, the feed water flow rate counter 76 keeps the predetermined flow rate even if the predetermined safety time is exceeded. When it is not detected, it is judged as abnormal, and the process proceeds to step 75 with YES to forcibly close the hot water solenoid valve 14 and display “water filling error” on the display unit 44 of the remote control 37 as well as an alarm sound. Thus, safety can be ensured reliably, and automatic test operation can be performed with peace of mind even if no one is present during the test operation.

  The water supply flow counter 76 is located upstream of the hot water supply bypass pipe 5 and can count the amount of water supplied to the hot water storage tank 2, thereby providing a flow counter in the hot water supply pipe 7. It is also possible to detect the amount of hot water filling by calculating the difference.

  Next, when the stopcock 33 is opened with the display on the remote control 37 as it is, the flow proceeds to step 60 to drive the circulation pump 31 to circulate the air in the heating circulation circuit 30 and the water in the hot water storage tank 2. The extracted air is discharged to the outside of the instrument in sequence by the relief valve 51, hot water supply or hot water filling.

  Then, when the test run timer 49 has elapsed for a predetermined time of 30 minutes in step 61, the process proceeds to step 62 to stop the circulation pump 31, and further proceeds to step 63 to drive the heat pump unit 21 and to turn the circulation pump 31 on. It is driven again and the boiling trial run is automatically started.

  If the outlet temperature sensor 47 or the uppermost hot water storage temperature sensor 48 detects that the temperature of the hot water heated by the heat pump unit 21 has reached the boiling target temperature in step 64 after starting the boiling trial operation, the process returns to step 65 in YES. The advancing heat pump unit 21 and the circulation pump 31 are stopped to end the boiling trial operation, and the “boiling completion” display and a buzzer notify that the boiling operation has been normally performed.

  If NO in step 64, the process proceeds to step 66 and it is determined whether the test run timer 49 has been counted up. If YES, the heat pump unit 21 and the circulation pump 31 are forcibly stopped in step 67 and “boiling” ”Up abnormal” is displayed and this is notified with a buzzer.

  Since the boiling trial run is automatically carried out in this way, it is not necessary for the person to stick to each other, and it is displayed on the remote control 37 whether the boiling is performed normally or whether the air is not sufficiently vented. It can be understood simply by looking at the section 44, and can be used for efficient and economical trial operation after construction. Furthermore, the safety timer 74 and the trial operation timer 49 can be used forcibly with a minimum drive time even in the event of an abnormality. The drive is stopped and it can be used with confidence.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic configuration diagram of a boiling trial operation state of a heat pump type hot water heater showing an embodiment of the present invention. The block diagram of the principal part electric circuit. The flowchart of the principal part. The block diagram of the principal part electric circuit which shows 1st other embodiment. The flowchart of the principal part. The schematic block diagram which shows the water filling state of 2nd other embodiment. The block diagram of the principal part electric circuit. The flowchart of the principal part.

Explanation of symbols

2 Hot Water Storage Tank 22 Compressor 23 Water Refrigerant Heat Exchanger 24 Expansion Valve 25 Outdoor Fan 26 Air Heat Exchanger 27 Heat Pump Circuit 28 Heaton Outward Pipe 29 Heaton Return Pipe 30 Heating Circulation Circuit 31 Circulation Pump 37 Remote Control 38 Test Operation Switch 44 Display 47 Outlet temperature sensor 48 Hot water storage temperature sensor

Claims (1)

A heat pump circuit in which an air heat exchanger having a compressor, a water refrigerant exchanger, an expansion valve, and an outdoor fan is annularly connected by a refrigerant pipe, and a hot water storage tank for storing hot water. The hot water storage tank and the water refrigerant exchanger Is connected with a heating circulation circuit consisting of a heat pump forward pipe and a heat pump return pipe each equipped with a circulation pump , and further has a bath mixing valve and a hot water solenoid valve at the upper part of the hot water storage tank. A hot water filling circuit connected to the hot water tank is connected, and a water supply pipe is connected to the lower part of the hot water storage tank. After water filling while venting air from the circuit, the water in the hot water storage tank is driven to circulate in the heating circulation circuit by driving the circulation pump, and after the air is removed from the heating circulation circuit, the heat Heat pump water heater, characterized in that was performed by the automatic boiling commissioning by driving the amplifier circuit.

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