JP2008116146A - Heat pump type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat pump type water heater automatically carrying out air bleeding work after construction. <P>SOLUTION: This heat pump type water heater comprises a heat pump unit 2 constituted by circularly connecting a compressor 26, a water-coolant exchanger 27, an expansion valve 28 and an air heat exchanger 29 having an outdoor fan 31 by coolant piping, and a hot water reservoir tank 7 for storing hot water. The hot water reservoir tank 7 and the water-coolant exchanger 27 are connected together by a heating circulation circuit 25 having a circulation pump 32, and trial operation such as air bleeding of the heating circulation circuit 25 is carried out automatically on the condition that there is no trial operation completion data nor time data when power is turned on. Consequently, it is very convenient since the trial operation is surely carried out, and no failure occurs in initial use, so that the heat pump type water heater can be used safely. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

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

Conventionally, in this type of heat pump type hot water heater, the trial run such as air venting of the heating circuit after construction is automatically performed by operating the air vent switch of the remote control, saving the trouble of trial run and easily I was able to do it. (For example, Patent Document 1)
JP 2006-250507 A

  By the way, in this prior art, if the air vent switch is not operated, trial operation such as air venting is not performed, and there is a problem that the heat pump type hot water heater does not normally operate at the first use.

  The present invention pays attention to this point, and in order to solve the above problems, in claim 1, a heat pump in which an air heat exchanger having a compressor, a water refrigerant exchanger, an expansion valve, and an outdoor fan is connected in an annular shape by a refrigerant pipe. The unit has a hot water storage tank for storing hot water, and the hot water storage tank and the water refrigerant exchanger are communicated with each other by a heating circulation circuit having a circulation pump. This is automatically performed on condition that there is no trial run completion data or time data when the power is turned on.

  According to a second aspect of the present invention, the trial run completion data is data such as individual number of the heat pump unit and operation time.

  According to claim 1 of the present invention, without operating the switch or the like, when the power switch of the remote control is turned on after construction, it is automatically detected that the trial operation is not performed, Trial operation such as water filling and boiling operation is performed automatically, so there is no worry about forgetting it, it is extremely convenient, and it can be used with peace of mind without causing any problems in the first use.

  Further, in claim 2, even when the heat pump unit is replaced, the test operation is automatically performed, which is very convenient and safe and can be used with peace of mind.

Next, a heat pump type water heater according to an embodiment of the present invention will be described with reference to the drawings.
1 is a hot water storage tank unit, 2 is a heating unit constituting a heat pump unit, 3 is a hot water tap, 4 is a remote control, 5 is a bathtub, and 6 is a power source.

  The hot water storage tank unit 1 includes a hot water storage tank 7 for storing hot water, a hot water pipe 8 connected to the upper part of the hot water storage tank 7, a water supply pipe 9 connected to the lower part of the hot water storage tank, and hot water from the hot water pipe 8. A mixing valve 11 that mixes low-temperature water from a bypass pipe 10 branched from the water supply pipe 9, a hot water temperature sensor 13 provided in a hot water pipe 12 connected downstream of the mixing valve 11, and a hot water pipe 12 are provided. A hot water supply sensor 14, a hot water temperature sensor 15 provided in the water supply pipe 9, a hot water supply pipe 16 branched from the hot water supply pipe 12 and connected to the bathtub 5, and a hot water filling valve for opening and closing the hot water supply pipe 16. 17, a hot water flow rate sensor 18 that integrates the flow rate flowing through the hot water filling pipe 16, an overpressure relief valve 19 that branches off from the hot water discharge pipe 8 and releases the overpressure of the connected hot water storage tank 7, and a water supply pipe 9. Salary provided in A pressure reducing valve 20 for reducing the pressure, a plurality of hot water storage temperature sensors 21 provided in the vertical direction of the side surface of the hot water storage tank 7, a hot water supply control unit 22 mainly composed of a microcomputer for controlling the hot water storage tank unit 1, The hot water storage tank 7 and the heating unit 2 are connected by an outward pipe 23 and a return pipe 24 to form a heating circulation circuit 25 for circulating hot water.

  The heating unit 2 includes a compressor 26 for compressing carbon dioxide refrigerant, a water refrigerant exchanger 27 as a condenser, an expansion valve 28, and an air heat exchanger 29 as an evaporator, and a heat pump circuit 30 and an air heat exchanger. Hot water comprising an outdoor fan 31 for blowing air 29, a variable capacity circulation pump 32 provided in the middle of the outgoing pipe 23 of the heating circulation circuit 25, and the thinnest pipe constituting the heating circulation circuit 25 of the water refrigerant exchanger 27 A heat exchange inlet temperature sensor 34 that detects the temperature of hot water flowing into the hot water flow path 33 and provided on the outlet side of the hot water flow path 33 and flows from the hot water flow path 33. The heat exchange outlet temperature sensor 35 for detecting the temperature of the air, the antifreezing temperature sensor 36 for detecting the temperature of the outside air, and a microcomputer for controlling the heating unit 2 are mainly configured. And a heating control unit 37.

  38 is an electric three-way valve that constitutes a flow path switching means provided in the middle of the return pipe 24 in the hot water storage tank unit 1. In normal times, the return pipe 24 is in a communicating state and is connected only during the air venting operation after construction. The drain pipe 39 and the return pipe 24 on the outlet side of the hot water flow path 33 are in communication with each other, and the air in the hot water flow path 33 and the heating circulation circuit 25 is pushed out of the circuit by tap water pressure.

  The remote controller 4 includes a power switch 40, a temperature / time setting switch 41 for setting a hot water supply set temperature and time, a hot water switch 42 for instructing hot water filling to the bathtub 5, and a hot water amount setting switch 43 for setting the hot water amount. The operation unit 45 having a setting changeover switch 44 for switching the setting by the temperature / time setting switch 41 between the temperature setting and the time setting, the display unit 46 formed of a dot matrix type fluorescent display tube, the operation unit 45 and the display unit. 46 and a remote control unit 47 mainly composed of a microcomputer for communicating and storing the information to the hot water supply control unit 22, and during normal operation, the operation unit 45 is provided on the display unit 46. The set hot water supply temperature and time information, the remaining hot water storage amount detected by the hot water supply temperature sensor 21, and the like are displayed.

  Further, when the power switch 40 is turned on after the construction, it is checked whether or not the hot water supply control unit 22 has a memory of the time setting. The hot water supply controller 22 outputs the electric three-way valve 38 from the communication between the return pipes 24, the drain pipe 39 and the return pipe 24 on the outlet side of the hot water flow path 33 are in communication with each other, and the water supply pipe After the stop cock 48 is opened, the circulating pump 32 is driven, and the timer 49 counts for a predetermined time, here 20 minutes, and the electric three-way valve 38 is restored to its original state by counting up. Returning, the circulation pump 32 is stopped and the air venting operation is terminated.

Next, the operation of this embodiment will be described.
Now that the appliances are installed and the hot water supply circuit, bath circuit, water supply pipe 9 and hot water supply pipe 12 are connected by piping, the power supply 6 is connected and the construction is completed. The air venting operation is performed after confirming leakage.

  First, when the power switch 40 of the remote control 4 is turned on after the construction, the power is turned on (step 50). As described above, whether or not the hot water supply control unit 22 stores the time setting is determined as to whether or not it is used for the first time. If NO, the process proceeds to step 52 with YES, the current time is input and displayed by the temperature time setting switch 41 and stored in the hot water supply control unit 22, and then the process proceeds to step 53 where the electric three-way valve 38 is connected to the return pipes 24. Then, the drain pipe 39 and the return pipe 24 on the outlet side of the hot water flow path 33 are in communication with each other, and after opening the stop cock 48 of the water supply pipe 9, the air venting operation for driving the circulation pump 32 is started. When the timer 49 counts 20 minutes in step 54, the process proceeds to step 55 with YES, and the electric three-way valve 38 is switched to the communication side with the storage tank 7, and the circulation is performed. The driving of the pump 32 to terminate the air vent operation Te stop monkey, is intended to return to the normal control in step 56.

  If the time setting is stored in step 51, it is determined that it is not the first use, and the determination is NO and the process proceeds to the normal control in step 56.

  Next, with respect to the other embodiment shown in FIG. 4, only the difference from the previous embodiments will be described. The overpressure relief valve 19 communicated with the hot water storage tank 7 is replaced with the relief valve 57 with an air valve having an air venting function. The electric three-way valve 38 and the drainage pipe 39 are eliminated, and only the circulation pump 32 is driven during the air venting operation to carry the air in the heating circulation circuit 25 into the hot water storage tank 7, from which the above-mentioned escape with an air valve is performed. The valve 57 is used for discharging, and has the effect that there are few parts and the air bleeding operation is simple.

  Here, the test operation has been described by restricting only the air venting. However, the present invention is not limited to this, and when the time setting memory is not stored in the hot water supply control unit 22, the hot water storage tank 7 can be vented or the air can be removed. It is also possible to sequentially perform test operations such as water filling to the hot water storage tank 7 after venting, air venting of the heating circuit 25 after water filling, and boiling operation after this air venting.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram of an air venting 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 schematic block diagram which shows the air bleeding operation state of other embodiment.

Explanation of symbols

2 Heating unit (heat pump unit)
7 Hot Water Storage Tank 22 Hot Water Supply Control Unit 25 Heating Circulation Circuit 26 Compressor 27 Water Refrigerant Heat Exchanger 28 Expansion Valve 29 Air Heat Exchanger 31 Outdoor Fan 32 Circulation Pump

Claims (2)

  A heat pump unit 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, a hot water storage tank for storing hot water, and the hot water storage tank and the water refrigerant exchanger Is connected through a heating circuit equipped with a circulation pump, and the test operation such as air venting of the heating circuit is automatically performed on condition that there is no test operation completion data or time data when the power is turned on. A heat pump type water heater characterized by things.   The heat pump type hot water heater according to claim 1, wherein the trial operation completion data is data such as an individual number of the heat pump unit and an operation time.

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