JP2000220887A - Heat pump hot water feeder device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pump type hot water feeder device in which a hybrid operation of combustion is carried out together with the heat pump, in particular, instant hot water feeding carried out under a heat pump hot water feeding is improved, then installing characteristic under no application of tank is also improved and a high efficient hot water feeding operation rang ing from a low flow rate to a high flow rate can be realized. SOLUTION: There are provided a condenser 15, a circulation pump 24 for circulating water in a water flow passage 21 and a bypass flow passage 27 and the like. An idling operation of a heat pump device 13 is carried out while the hot water feeding under an operation of a combustion device 31 is being carried out for a specified period of time after starting the hot water feeding. Due to this fact, it is possible to attain a high speed setting at the time of hot water feeding, the instant hot water feeding is improved, a hot water storing tank or a heater can be eliminated, its installing characteristic is also improved, a working characteristic can be simplified and an energy saving hot water feeding operation can be carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump water heater.

[0002]

2. Description of the Related Art Conventionally, this type of heat pump water heater is
As shown in FIG. 13, a heat pump unit 6 including a refrigerant flow path 5 in which a compressor 1, a condenser 2, a decompressor 3, and an evaporator 4 are sequentially connected in a closed circuit, a hot water storage tank 7, a circulation pump 8, and a condenser 2. A hot water supply unit 11 comprising a water flow path 10 to which a heater 9 is connected.

In the heat pump water heater of the above construction, the high-temperature and high-pressure superheated gas refrigerant discharged from the compressor 1 flows into the condenser 2 where the water sent from the circulation pump 8 is heated by the heat of condensation to store hot water. It is stored in a tank 7, and when the outside air temperature is low, the heater 9 is also used to perform high-temperature boiling. On the other hand, the refrigerant condensed and liquefied in the condenser 2
The compressor is operated in a cycle in which the air flows into the evaporator 4, absorbs atmospheric heat collected by the fan 12, evaporates and gasifies, and returns to the compressor 1 again.

[0004]

However, the conventional heat pump water heater is superior to other water heaters in terms of energy efficiency, but like the electric water heater,
As shown in FIG. 13, it has a large hot water storage tank 7 of about 300 liters to 460 liters for temporarily storing the hot water as shown in FIG. Location is limited. For example, if it is attempted to use the system without the hot water storage tank 7, the flow rate of hot water is small, and it is not possible to cope with a large flow rate such as bath water supply, and it takes several minutes to start up in a hot water supply state.
It has a big problem in terms of hot water. Furthermore, even if it has a hot water storage tank 7, a high-power heater 9 is used to prevent running out of hot water.
And a 100V power supply cannot be used, and special 200V power supply work is required. In addition, in winter when the outside air temperature is low, the efficiency of absorbing heat from the atmosphere is reduced, and there is a problem that the effect of the heat pump water heater in terms of efficiency cannot be sufficiently obtained.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has a bypass flow passage communicating between a water supply pipe and a hot water supply pipe through switching means and a circulating pump. Is operated simultaneously with the operation of the combustion unit, the hot water in the condenser water flow path is circulated through the bypass flow path to perform the warm-up operation of the heat pump unit. In this case, the shortfall is compensated for by the operation of the combustion unit.

According to the above invention, at the start of hot water supply, hot water is supplied only by the ordinary combustion unit, and hot water in the condenser water flow path is supplied by the circulation pump for a certain period of time between the water supply pipe and the water flow path.
Hot water pipe, flows in the circulation channel formed by the bypass channel,
The operation of the heat pump unit is operated without any trouble, and the temperature of the compressor increases accordingly. As a result, when hot water supply by the heat pump unit operation is started after a certain period of time, high-temperature hot water supply can be performed. If the hot water supply application at the start of hot water supply requires a large flow rate such as bath water supply, in addition to the hot water produced by the heat pump unit operation, the combustion unit operation that supplies hot water from the start of hot water supply gradually increases the hot water supply capacity. In the case of small flow rate applications such as kitchens and wash basins, the operation of the combustion unit is stopped, and the desired hot water is supplied to the mixing section connecting the hot water supply pipe and the tapping pipe.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, a compressor, a condenser, a decompressor, and an evaporator are connected in a refrigerant flow path having a closed circuit,
The condenser is provided with a water flow path for performing heat exchange with the refrigerant flow path,
A water supply pipe and a hot water supply pipe are connected to the water flow path, a heat pump unit communicating the water supply pipe and the hot water supply pipe, and having a circulation pump and a bypass flow path having switching means at both ends, and a water supply pipe and a hot water supply pipe are connected. Heat exchange unit, a combustion unit that heats the heat exchange unit, a combustion unit that includes an exhaust unit that guides exhaust gas after combustion out of the device, a mixing unit that connects a hot water supply pipe and a hot water discharge pipe, A controller having a heat pump unit and a hot water supply control unit for controlling operation of the combustion unit is provided. The hot water supply control unit operates the combustion unit for a certain period of time from the start of hot water supply, and at the same time, uses a bypass flow path to perform heat pump unit operation. The heat pump unit is always operated at the time of hot water supply after a lapse of a predetermined time, and the shortage of required capacity is performed by the operation of the combustion unit.

The hot water supply control section of the controller operates the combustion unit for a certain period of time from the start of hot water supply, and at the same time, feeds a water supply pipe connected to a water flow path of the condenser in order to speed up the rise of heat pump unit operation. The hot water supply pipe is connected to a hot water supply pipe by a bypass flow path, and both ends are branched to the main flow side by a switching means, and water is circulated by a circulation pump to perform a warm-up operation of the heat pump circuit, thereby raising the temperature of the compressor. After a certain period of time, the system shifts to normal heat pump hot water supply, and the combustion unit that was supplying hot water at the start of hot water supply is gradually reduced to the required capacity minus the capacity supplied by the heat pump unit, and the heat pump unit alone When the flow rate becomes small enough to be supplied by the operation, the operation is stopped, and the desired hot water continues to be supplied from the mixing section connecting the hot water supply pipe and the tapping pipe. For example, in the case of bath water supply, large-volume hot water can be supplied mainly from the combustion unit.On the other hand, in the case of using a small flow rate such as kitchen, washing, rough hand washing, and face washing, which are frequently used as applications, only the heat pump unit is used. Can be almost satisfied with the single operation. Therefore, compared to the case where the hot water supply energy is used, for example, in all the hot water supply modes using the gas water heater alone, the energy efficiency of the heat pump unit can be improved because of the higher energy efficiency. Further, since a hot water storage tank and a heater are not required, since the hot water storage tank is not required, the size can be reduced, the installation can be simplified, and the workability can be greatly improved.

Further, the compressor has a temperature detecting means for detecting a discharge temperature, and the hot water supply control section of the controller circulates the bypass flow path until the temperature detected by the temperature detecting means reaches a temperature set value. At the time of hot water supply after reaching the set value, the heat pump unit is always operated, and the shortage of required capacity is performed by operation of the combustion unit.

The warm-up operation is started and terminated by comparing the value detected by the temperature detecting means with a predetermined set temperature. However, once the compressor is started, the compressor temperature rises quickly. Therefore, the hot water supply time by the operation of the heat pump unit can be prolonged, and the operation start state can be stabilized.

Further, when the hot water supply operation is not performed within a predetermined time from the stop time of the hot water supply operation, the hot water supply control unit of the controller performs the intermittent warm-up operation of the heat pump unit for a predetermined time, and supplies the hot water during the intermittent warm-up operation mode. When the start signal is detected, the heat pump unit is operated after a certain time has elapsed during the warm-up operation, and after the warm-up operation has been stopped for a certain time while the warm-up operation is stopped, the shortage of the required capacity is performed by the operation by the combustion unit. It was made.

[0012] Even when the hot water supply operation is not performed,
Since the warm-up operation is performed at regular intervals so that the temperature of the compressor does not decrease, hot water supplied from the heat pump unit operation can be immediately turned on.

Further, the compressor has a temperature detecting means for detecting a discharge temperature, and the hot water supply control unit of the controller performs a warm-up operation of the heat pump unit until the temperature detected by the temperature detecting means reaches a temperature set value. It was made.

A compressor, a condenser, a decompressor, and an evaporator are connected to a refrigerant flow path having a closed circuit, and the condenser is provided with a water flow path for performing heat exchange with the refrigerant flow path. A heat pump unit having a water supply pipe and a hot water supply pipe connected thereto, a heat exchange section having a water supply pipe and a hot water supply pipe connected thereto, a combustion section for heating the heat exchange section, and an exhaust section for guiding exhaust gas after combustion out of the device. And a mixing unit that connects the hot water supply pipe and the tapping pipe, a heating unit that communicates with the tapping pipe via the flow path cutoff unit and warms the compressor, and controls the operation of the heat pump unit and the combustion unit. A controller having a hot water supply control unit for performing the operation of the combustion unit for a certain period of time from the start of hot water supply, while simultaneously opening the flow path blocking means and communicating with the tapping pipe and the heating unit, After a certain period of time, close the flow path Time is always that the heat pump unit is operated, and the shortage of the necessity ability to perform in operation by the combustion unit.

[0015] Since a part of the hot water from the combustion unit is supplied to the heating section for a certain time from the start of hot water supply, the compressor is warmed up. It can be carried out.

Further, the compressor has a temperature detecting means for detecting a discharge temperature, and the hot water supply control unit of the controller opens the flow path shutoff means until the temperature detected by the temperature detecting means reaches a temperature set value, Hot water is supplied to the heating unit.

[0017] Since the actual temperature of the compressor can be detected, the temperature rise of the compressor is accelerated from the second operation.
The operation time of the heat pump unit can be extended.

Further, the heating section is formed of a cylindrical body which comes into surface contact.

Since the heating section can wrap the entire compressor surface, the compressor can be warmed more quickly than a configuration in which it is wound with piping.

Further, the evaporator is disposed so as to absorb waste heat generated from the combustion unit, and the hot water supply control section of the controller includes:
The capacity of the combustion unit is varied depending on the temperature condition of the refrigerant circuit at the outlet of the evaporator.

The combustion efficiency of the combustion unit is usually 8
At present, the remaining 20% of the energy is released to the atmosphere through the exhaust unit at about 0%, and by installing an evaporator near the exhaust unit to absorb this heat, it can be used in a high temperature environment higher than atmospheric heat. The operation of the heat pump unit is always possible, and the energy saving effect of the heat pump operation can be obtained stably yearly regardless of the season. Further, in addition to increasing the efficiency by effectively utilizing waste heat, when viewed from the combustion unit side, since the high-temperature exhaust gas is absorbed by the evaporator, the exhaust gas is cooled at a low temperature and released, thereby improving safety. Furthermore, the design of the refrigerant circuit on the heat pump unit side specifies the amount of refrigerant to be charged so that the cycle of the compressor, condenser, evaporator, and decompressor used before operating in the normal system can operate without any adverse environmental conditions. However, since the heating capacity is controlled so that the temperature at the evaporator outlet is always equal to or lower than the set value so as to obtain the optimum temperature of the evaporator due to the combustion waste heat environment, the heat pump unit can be operated with high efficiency, Even if the evaporator is directly heated, abnormal operation of the heat pump unit can be prevented.

Further, an evaporator is arranged in the exhaust part of the combustion unit.

Further, since the evaporator is further provided in a high-temperature atmosphere, the evaporator can be made more compact. On the other hand, when the size of the evaporator is not changed, the capacity of the heat pump unit can be increased.

Further, the heat exchange section of the combustion unit is shared with the evaporator.

Since the heat exchange part of the combustion unit is shared with the evaporator of the heat pump unit, parts such as fins constituting the evaporator other than the refrigerant pipe are not required. For example, the combustion unit and the heat pump unit are stored in one case. This makes it possible to realize a more compact apparatus.

[0026]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a system diagram of a heat pump hot water supply apparatus according to Embodiments 1 to 4 of the present invention. In FIG. 1, a heat pump unit 13 includes a compressor 14, a condenser 15, a decompressor 16, an evaporator 17, and a fan 18 for passing atmospheric air through the evaporator 17 to collect atmospheric heat. Is connected by a refrigerant flow path 19 in which a predetermined amount of refrigerant is sealed. A thermistor is attached to the compressor 14 as temperature detecting means 20 for detecting a surface temperature, and the condenser 15 is A water flow path 21 is provided to face the flow of water, and the inlet side is connected to a water supply pipe 22, the outlet side is connected to a hot water supply pipe 23, the water supply pipe 22 communicates with the hot water supply pipe 23, the circulation pump 24 and the water supply pipe 2
2. A bypass flow path 27 having switching valves 25 and 26 for performing a branching operation with the hot water supply pipe 23, and a flow rate sensor 2 for detecting a water amount is provided in the water supply pipe 22 on the inlet side of the condenser 15.
8A, a water control valve 29A having a closing function and controlling the amount of water is provided, and a hot water supply pipe 23 has a hot water supply thermistor 30 for detecting a hot water supply temperature. On the other hand, the combustion unit 31 includes a combustion section 32, a heat exchange section 33, and an exhaust section 34. The inlet side of the heat exchange section 33 is connected to the water supply pipe 22 branched upstream, and the exit side is connected to the tapping pipe 35. I have. The water supply pipe 22 of the combustion unit 31 is provided with a flow rate sensor 28B for detecting the amount of water, a water control valve 29B, and a water input thermistor 36 for detecting the input water temperature. ing. The combustion section 32 is connected to a gas block 38 having a source solenoid valve for turning on and off the fuel, a proportional valve for proportionally controlling the supply amount, and a combustion fan 39 for supplying combustion air. The hot water supply pipe 35 of the combustion unit 31 and the hot water supply pipe 23 of the heat pump unit 13 communicate with each other at a mixing section 40 and are connected to a hot water tap 42 by a hot water supply pipe 41. Each unit is powered by commercial power 4
3 has a controller 44 which receives signals from various sensors, outputs signals and operation outputs to various actuators, and controls the operation of the combustion unit 31 and the heat pump unit 13. Has a hot water supply control unit 45 for selecting an operation based on the amount of water flowing through the unit. Further, a remote controller 46 of the heat pump water heater main body is provided on the terminal side, and has a power switch 47, a display unit 48, and a temperature setting switch 49.

Next, the operation will be described. When the power switch 47 is turned on, the water control valves 29A and 29B that close the water supply pipe 22 when the power switch 47 is turned off are in the fully open state. Next, when the hot water tap 42 is opened, city water is supplied from the water supply pipe 22 to each unit. The operation of the heat pump unit 13 will be described first. When the flow rate sensor 28A detects a water amount value equal to or higher than the preset minimum operation flow rate, the fan 18 is driven first, and then the compressor 14 is operated. Activated, temperature setting switch 49
The amount of water flowing through the condenser 15 is controlled by the water control valve 29A by comparing the detected value of the hot water supply thermistor 30 with the temperature of the hot water supply thermistor 30 and sent to the mixing section 40 from the hot water supply pipe 23. In the case of the inverter drive, the number of revolutions of the compressor 14 can be changed, and accordingly, the refrigerant circulation amount is changed, and the decompressor 16 is automatically controlled accordingly. Since it is determined, the decompressor 16 is fixed by a capillary tube, or a thermostatic expansion valve that operates mechanically according to the outlet temperature of the evaporator 17 is used. Next, the operation of the combustion unit 31 will be described using an example of a gas water heater.
When the minimum operating flow rate is detected at B, the combustion fan 39 starts, enters the ignition state, opens the main solenoid valve and the proportional valve of the gas block 38, ignites in the combustion section 32, and starts combustion. Then, water supplied from the water supply pipe 22 is passed through a pipe having a large number of fins in the heat exchange section 33 to perform heat exchange, and hot water at a set temperature is sent from the tapping pipe 35 to the mixing section 40. As a result, in the case of simultaneous operation, hot water is produced from both units, mixed in the mixing section 40 through the hot water supply pipe 23 and the hot water discharge pipe 35, communicated with one and passed through the hot water supply pipe 41, and the hot water
Supplied from 2. At that time, the controller 4 for the temperature setting
The control of 4 is performed so that the temperature of the temperature setting switch 49 is obtained by the final hot water tap 42 and the temperature setting value and the tapping thermistor 3.
7 is compared with the temperature difference from the water input thermistor 36 and the water block value so as to obtain a predetermined combustion amount based on the water amount value.
Is controlled, and accordingly, the rotation speed of the combustion fan 39 is controlled to maintain the combustion state. The high-temperature exhaust gas after combustion is released from the exhaust unit 34 to the outside of the unit.

On the other hand, as shown in the flow chart of FIG. 2, the control for the operation of both units is such that the hot water supply operation is performed by the combustion unit 31 for a certain period of time from the start of the hot water supply, during which the heat pump unit 13 controls the temperature of the compressor 14. A warm-up operation is started to raise the temperature to some extent and to speed up the rise of hot water supply. The operation at that time is performed by switching the circulation pump 2 so that the switching valves 25 and 26 communicate with the bypass flow path 27 side.
In step 4, the heat pump operation is performed by moving the water flow path 21 of the condenser 15. In the subsequent hot water supply operation, the switching valves 25 and 26 are switched to switch the normal heat pump unit 1.
When the three operations are started and the total value of the detected water amounts of the respective flow sensors 28A and 28B is larger than the set flow value, the operation of the heat pump unit 13 is operated at the maximum output, and the shortage is supplemented by the operation of the combustion unit 31. Conversely, if the detected water amount is less than the flow rate set value, the combustion unit 31 is stopped and the heat pump unit 13 operates alone.

(Embodiment 2) FIG. 3 is a control flowchart of a heat pump water heater according to Embodiment 2 of the present invention.

The difference from the first embodiment is that at the start of hot water supply, the hot water supply control unit 45 of the controller 44 operates with priority on the combustion unit 31 to perform a normal hot water supply operation. , The temperature of the compressor 14 is detected and compared with a preset temperature set value, and the warm-up operation is performed until the temperature set value is reached. (Embodiment 3) FIG. 4 is a flowchart of a heat pump water heater according to Embodiment 3 of the present invention. The difference from the first embodiment is that when the hot water supply operation is not performed until a predetermined time has elapsed since the stop of the hot water supply operation, the heat pump unit 13 performs the warm-up operation mode and continues the intermittent operation that is turned on and off for a predetermined time. is there. Also, when the hot water supply start signal is read during the intermittent operation, if the warm-up operation is in progress, the combustion unit 3 that has already started hot water supply after the ongoing warm-up operation is completed.
The operation of the normal heat pump unit 13 is started in parallel with the operation 1 and if the warm-up operation is stopped, the normal heat pump unit 31 is operated after the next warm-up operation is completed.

(Embodiment 4) FIG. 5 is a flowchart of a heat pump hot water supply apparatus according to Embodiment 4 of the present invention.

The difference from the third embodiment is that the detected value of the temperature detecting means 20 for detecting the temperature of the compressor 14 is compared with a preset temperature set value. Stop the operation, and perform the warm-up operation when: (Embodiment 5) FIG. 6 is a system diagram of a heat pump hot water supply apparatus according to Embodiments 5 and 6 of the present invention. The components having the same reference numerals as those in the first embodiment have the same structure, and the description will be omitted.

A tapping pipe 35 of the combustion unit 31 is branched, and a pipe as a heating unit 51 is provided around the compressor 14 via an electromagnetic valve or a water control valve as a flow shutoff means 50.

Next, the operation will be described with reference to the control flowchart of FIG. When the hot water tap 42 is opened, the combustion unit 31
Starts the normal operation, the flow path shut-off means 50 is opened during hot water supply for a set constant time, and the hot water that has been discharged flows back around the compressor 14 to the tapping pipe 35 again. After a certain period of time, the flow shutoff means 50 is closed. During this time, the compressor 14 is heated and warmed, so that the hot pump can be operated by operating the heat pump unit 13, and the combustion unit 31 is operated.
And the simultaneous hot water supply is started.

(Embodiment 6) FIG. 8 is a control flowchart of a heat pump water heater according to Embodiment 6 of the present invention.

The difference from the fifth embodiment is that the flow shutoff means 50
Is opened and closed at the temperature of the compressor 14, and the detected value of the temperature detecting means 20 for detecting the temperature of the compressor 14 is compared with a preset temperature set value. This is for closing the flow cutoff means 50.

(Embodiment 7) FIG. 9 is a sectional view of a main part of a heat pump hot water supply apparatus according to Embodiment 7 of the present invention.

The difference from the structure of the fifth embodiment is that the compressor 14
Is constituted by a donut-shaped member so as to surround the compressor 14.

(Eighth Embodiment) FIG. 10 is a system diagram showing one embodiment of a heat pump water heater according to an eighth embodiment of the present invention.

The difference from the structure of the first or fifth embodiment is that the evaporator 53 is disposed so as to absorb the waste heat of the combustion unit 31 (indicated by the large arrow in the figure). FIG.
0 indicates a case where another evaporator 53 for absorbing waste heat is provided in parallel with the evaporator 17 of the first embodiment, but the evaporator 17 for absorbing atmospheric heat may not be provided. In FIG. 10, the refrigerant flow path 19 is branched via the solenoid valves 54 and 55 on the downstream side of the condenser 15,
A decompressor 57 and a waste heat absorbing evaporator 53 are provided in a newly provided refrigerant flow path 56, and an evaporating thermistor 58 is attached to the outlet side thereof. The evaporating thermistor 50 is provided to optimize the degree of superheating of the refrigerant gas in the evaporator 53 that absorbs waste heat. Further, check valves 59 and 60 are provided in the respective refrigerant flow paths 19 and 56 on the inlet side of the compressor 14.

The components having the same reference numerals as in the first embodiment have the same structure, and the description is omitted.

Next, the operation will be described. In the case of having two evaporators 17 and 53 as shown in FIG.
For example, although not shown, two evaporators 1 are selected.
A comparison can be made between the ambient temperature and the outlet temperature in the areas 7 and 56, and a flow path that can absorb more heat is selected. Normally, when the combustion unit 31 is operating or after stopping, the solenoid valve 54 is closed, the solenoid valve 55 is opened, and the refrigerant flow path 56 on the side of the evaporator 53 is used. About 20% of the combustion amount is absorbed and used. In addition, as shown in FIG. 10, when used together with the evaporator 17 for absorbing heat from the atmosphere, it is effective when the outside air temperature is high in the summer or during the daytime, and finer energy utilization becomes possible.

(Embodiment 9) FIG. 11 is a system diagram showing an embodiment of a heat pump hot water supply apparatus according to Embodiment 9 of the present invention.

The difference from the eighth embodiment is that the evaporator 53 is provided in the exhaust part 34 of the combustion unit 31. The installation location may be on the wall of the exhaust unit 34 or inside. Thereby, waste heat is more stably exchanged with the evaporator 53.

(Embodiment 10) FIG. 12 shows Embodiment 1 of the present invention.
FIG. 1 is a system diagram showing an embodiment of a heat pump hot water supply device of No. 0.

The difference from the eighth embodiment is that the evaporator 53 is provided in the heat exchange section 33 of the combustion unit 31. The fin having the increased heat transfer area of the heat exchange section 33 is shared, and a part of the copper pipe is connected to the refrigerant flow path 56 to form the evaporator 53.
We use as.

[0048]

As described above, according to the present invention, the combustion unit is operated for a certain period of time from the start of hot water supply, during which the heat pump unit uses the bypass passage having a circulation pump to circulate water in the water passage of the condenser. After performing warm-up operation to circulate and raise the temperature of the compressor, hot water is sent from the hot water supply pipe to the mixing section, and the hot water supplied from the mixing section is given priority over the heat pump unit operation and the shortage is compensated by the combustion unit operation. The hot water supply control unit that controls the operation eliminates the need for hot water storage tanks, for which the installation conditions have been determined, so the heat pump water heater can be used even in a house that could not be installed in the past because it was significantly more compact. Having. In addition, since the heater installation that requires the 200V power supply construction is not required, the workability in the power supply construction and tank installation can be greatly simplified. On the other hand, on the software side, by having the combustion unit take charge of the point that it takes time to supply hot water, which is a weak function of heat pump hot water supply, and the point that it can not cope with high flow rate, hot water can be supplied from large flow rate to small flow rate without any problem, Since a heat pump unit having high energy efficiency can be preferentially operated in a small flow rate application which is frequently used, a large energy saving effect can be obtained from the viewpoint of the entire hot water supply.

Further, since the control by the hot water supply control unit is performed by comparing the warm-up operation time of the heat pump unit with the detected temperature value of the compressor and the temperature set value, the heat pump unit is efficiently operated without waste in the warm-up operation. The heat pump cycle during operation can be stabilized.

Further, even when the hot water supply operation is not performed by a predetermined time after the hot water supply operation stop time by the hot water supply control unit, the heat pump unit can perform the intermittent warm-up operation for a predetermined time and can start the compressor temperature at any time. Since the temperature is controlled, the hot water supply start-up by the heat pump unit can be accelerated.

Further, the warm-up time can be efficiently performed by directly detecting the compressor temperature instead of the pause time.

Further, since the heating section is provided so that the tapping pipe of the combustion unit is branched and wound around the compressor via the flow rate cutoff means, one time during the tapping from the combustion unit for a certain time from the start of hot water supply. Hot water flows to the heating unit side to warm the compressor. Therefore, the hot water supply rise time of the heat pump unit can be improved without performing the warm-up operation of the heat pump unit.

Further, in addition to the above-described effects, by directly detecting the compressor temperature, the rise after the second time can be accelerated.
Heat pump hot water supply time can be used effectively.

Further, the heating section is formed in a cylindrical body so as to make surface contact, and hot water is supplied from a tapping pipe therein, and the entire surface of the compressor is wrapped, so that heat is radiated as compared with a configuration in which the pipe is wound with piping. Can be heated more quickly.

In addition, since the evaporator is provided so that the hot water supplied from the heat pump unit can absorb the waste heat generated from the combustion unit, the control of varying the capacity of the combustion unit depending on the temperature condition at the evaporator outlet is provided. Thus, the reliability of the refrigerant cycle itself in a high-temperature environment can be obtained, and the energy released by the combustion unit to the atmosphere can be effectively used.
As a result, a high-efficiency heat pump hot-water supply operation can be constantly performed year-round irrespective of the season, and a great energy-saving effect can be obtained. On the other hand, as an advantage from the combustion unit side, since the high-temperature exhaust gas blown out from the exhaust unit is cooled, the installation height of the exhaust unit is not problematic, and there is an advantageous effect in terms of safety.

Further, since the evaporator is disposed at the exhaust part of the combustion unit, heat transfer between the evaporator and the exhaust gas is more easily promoted, and the size of the evaporator can be further reduced.
As a result, the size of the entire heat pump water heater can be reduced. Conversely, there is an effect that the output of the heat pump unit can be increased without changing the size of the evaporator.

Further, since the evaporator is used in common with the heat exchange section of the combustion unit, it has the effect of reducing the number of parts in addition to the effect of heat transfer, and can greatly reduce the size. It is possible to install the pipe shaft without any limitation on installation.

[Brief description of the drawings]

FIG. 1 is a system diagram of a heat pump water heater according to embodiments 1 to 4 of the present invention.

FIG. 2 is a control flowchart of the heat pump water heater.

FIG. 3 is a control flowchart of a heat pump water heater according to a second embodiment of the present invention.

FIG. 4 is a control flowchart of a heat pump water heater according to a third embodiment of the present invention.

FIG. 5 is a control flowchart of a heat pump water heater according to a fourth embodiment of the present invention.

FIG. 6 is a system diagram of a heat pump hot water supply apparatus according to Examples 5 and 6 of the present invention.

FIG. 7 is a control flowchart of the heat pump water heater.

FIG. 8 is a control flowchart of a heat pump water heater according to a sixth embodiment of the present invention.

FIG. 9 is a sectional view of a main part of a heat pump water heater according to a seventh embodiment of the present invention.

FIG. 10 is a control flowchart of a heat pump water heater according to an eighth embodiment of the present invention.

FIG. 11 is a control flowchart of a heat pump water heater according to a ninth embodiment of the present invention.

FIG. 12 is a control flowchart of a heat pump water heater according to a tenth embodiment of the present invention.

FIG. 13 is a configuration diagram of a conventional heat pump water heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 13 Heat pump unit 14 Compressor 15 Condenser 16 Decompressor 17 Evaporator 19 Refrigerant flow path 20 Temperature detection means 21 Water flow path 22 Water supply pipe 23 Hot water supply pipe 24 Circulation pump 25, 26 Switching means 27 Bypass flow path 31 Combustion unit 32 Combustion unit 33 heat exchange section 34 exhaust section 35 tapping pipe 40 mixing section 44 controller 45 hot water supply control section 50 flow path cutoff means 51, 52 heating section 53 evaporator

Claims (10)

[Claims] A compressor, a condenser, a decompressor, and an evaporator are connected to a refrigerant flow path configured as a closed circuit, and the condenser is provided with a water flow path for performing heat exchange with the refrigerant flow path. A water supply pipe and a hot water supply pipe are connected to the water flow path, the heat pump unit communicates the water supply pipe and the hot water supply pipe, and has a circulation pump and a bypass flow path having switching means at both ends, and a heat pump unit, A heat exchange unit to which a tapping pipe is connected, a combustion unit that heats the heat exchange unit, a combustion unit that includes an exhaust unit that guides exhaust gas after burning out of the device, the hot water supply pipe, and the tapping pipe And a controller having a hot water supply control unit for controlling the operation of the heat pump unit and the combustion unit, and the hot water supply control unit operates the combustion unit for a certain time from the start of hot water supply. At the same time, the bypass passage There do warm-up operation of the heat pump unit, a predetermined time when the hot water supply after the elapse always the heat pump unit is operating, the heat pump hot water supply apparatus and performs the shortage of the necessity capacity operation by the combustion unit. 2. The compressor has temperature detecting means for detecting a discharge temperature, and the hot water supply control section of the controller circulates the bypass flow path until the temperature detected by the temperature detecting means reaches a temperature set value. 2. The heat pump hot water supply apparatus according to claim 1, wherein the heat pump unit is always operated at the time of hot water supply after the temperature set value is reached, and the shortage of required capacity is performed by operation of the combustion unit. 3. A hot water supply control section of the controller, wherein when the hot water supply operation is not performed by a predetermined time after the stop time of the hot water supply operation, the heat pump unit performs an intermittent warm-up operation for a predetermined time,
When the hot water supply start signal is detected during the intermittent warm-up operation mode, the heat pump unit is operated after performing the warm-up operation for a predetermined time during the warm-up operation, and after performing the warm-up operation for a fixed time during the stoppage of the warm-up operation. The heat pump hot water supply apparatus according to claim 1, wherein the heat is supplied by operation of the combustion unit. 4. The compressor has a temperature detecting means for detecting a discharge temperature, and a hot water supply control unit of the controller performs a warm-up operation of the heat pump unit until the temperature detected by the temperature detecting means reaches a temperature set value. The heat pump hot water supply device according to claim 3. 5. A compressor, a condenser, a decompressor, and an evaporator are connected to a refrigerant flow path having a closed circuit, and the condenser is provided with a water flow path for performing heat exchange with the refrigerant flow path. A heat pump unit in which a water supply pipe and a hot water supply pipe are connected to the water flow path; a heat exchange section in which the water supply pipe and the hot water supply pipe are connected; a combustion section that heats the heat exchange section; A combustion unit configured with an exhaust unit or the like led out to, a mixing unit that connects the hot water supply pipe and the hot water pipe, a heating unit that communicates with the hot water pipe through a flow path blocking unit to warm the compressor, A controller having a heat pump unit and a hot water supply control unit for controlling the operation of the combustion unit, wherein the hot water supply control unit operates the combustion unit for a certain period of time from the start of hot water supply, and simultaneously shuts off the flow path. Opening means and the tapping pipe and the heating A heat pump hot water supply device, wherein the heat pump unit is always operated at the time of hot water supply while the flow path shutoff means is closed after a lapse of a predetermined time, and the shortage of required capacity is performed by operation of the combustion unit. . 6. The compressor has a temperature detecting means for detecting a discharge temperature, and a hot water supply control section of the controller opens the flow path shutoff means until the temperature detected by the temperature detecting means becomes equal to or higher than a set value. The heat pump hot water supply device according to claim 5, wherein hot water is supplied to the heating unit. 7. The heat pump hot water supply apparatus according to claim 5, wherein the heating unit is formed of a cylindrical body that comes into surface contact. 8. A hot water supply control section of a controller, wherein the evaporator is arranged to absorb waste heat generated from the combustion unit, and the capacity of the combustion unit is varied depending on a temperature condition of a refrigerant circuit at an evaporator outlet. Item 8. The heat pump water heater according to any one of Items 1 to 7. 9. The heat pump water heater according to claim 8, wherein an evaporator is provided in an exhaust portion of the combustion unit. 10. The heat pump water heater according to claim 8, wherein the heat exchange part of the combustion unit is shared with the evaporator.