JPH1089791A - Controller for multifunctional heat pump system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive not to impair comfortableness due to an increase of number of times of ON/OFF of thermometal or abrupt change of a supply air temperature. SOLUTION: This multifunctional heat pump system comprises a compressor 1, a four-way valve 6, an indoor heat exchanger 11 and an outdoor heat exchanger 8. A refrigerating cycle for communicating in a suitable order by switching them by switching the valve 6 so that refrigerant flow passages can be suitably switched. In this case, the system also comprises a control means 15 for controlling the valve 6 and the cycle, turning ON, OFF a thermometal in response to an indoor temperature and an indoor set temperature to control a compressor frequency. The means 15 sets a target control pressure to a lower value than the target control pressure when the thermometal is turned OFF if the thermometal is turned ON again after a heating thermometal is turned OFF at the time of heating, and controls the compressor frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the control of a multifunctional heat pump system having a plurality of units including a heat exchanger for a heat pump heat source utilizing device and realizing a plurality of operation modes by appropriately switching a refrigeration cycle. is there.

[0002]

2. Description of the Related Art Conventionally, as a control method of an air conditioner for changing a compressor frequency, for example, Japanese Patent Application Laid-Open No. 64-75847 is known.
There is an official gazette. FIG. 16 is an explanatory diagram of a control method of an air conditioner for changing a compressor frequency described in the publication.
In the drawing, in the operation of the refrigeration cycle, a preliminary operation is required for the lubricating oil in the compressor to flow to the bearing portion and the like, and the compressor is operated at a constant rotation speed for a fixed time.

In the intermittent operation after the preliminary operation, the control means determines that the operation is in the initial stage when the temperature difference is large, for example, due to the difference between the room temperature and the set value of the room temperature. Control to change proportionally. When the temperature difference is small, it is determined that the operation is performed after the operation is stopped at the lowest rotation speed by the thermo OFF after the temperature difference between the room temperature and the room temperature set value is reduced.

[0004] In this case, when the compressor is operated with a load less than the minimum capacity, the thermo-ON / OFF is frequently repeated. Therefore, the compressor is operated at the minimum rotation speed for about 3 to 5 minutes.
Thereafter, control is performed so as to start an operation for controlling the number of revolutions of the compressor according to the temperature difference between the room temperature and the room temperature set value. Such operation control can reduce the number of times of thermo ON / OFF even when operating with a load equal to or less than the minimum capacity, thereby reducing the number of changes in room temperature and improving comfort.

[0005]

The conventional method of controlling an air conditioner that changes the compressor frequency is configured as described above. Therefore, for example, the heating operation is thermo-off, and the thermo-on is performed again to perform the heating operation. When started, when operating with a load less than the minimum capacity, the operation is performed with the compressor frequency fixed at the minimum frequency for about 3 to 5 minutes, so the heating capacity fluctuates even if the indoor load fluctuates at that time. There was a problem that it could not be done.

After the operation at the lowest frequency is released, the number of rotations of the compressor is controlled in accordance with the temperature difference between the room temperature and the set room temperature. However, there is a problem in that the temperature of the heating air blows greatly changes, which causes discomfort to the heating user.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is possible to reduce the discomfort to the user of the air conditioner due to an increase in the number of times the thermostat is turned on and off, and a sudden change in the blowing temperature. It is an object to obtain a control device for a functional heat pump system.

[0008]

A control device for a multifunctional heat pump system according to the present invention has a compressor, a four-way valve, an indoor heat exchanger, and an outdoor heat exchanger, and these are appropriately switched by switching the four-way valve. While forming a refrigeration cycle that communicates in order, a heat exchanger for a heat pump heat source utilizing device is provided in parallel between the outlet side of the compressor and the indoor heat exchanger and between the outdoor heat exchanger, and the refrigerant flow passage is appropriately formed. In the switchable multifunctional heat pump system, control means for controlling the four-way valve and the refrigeration cycle, a two-way valve provided on the liquid side of the outdoor heat exchanger, and synchronizing the two-way valve with the four-way valve And a relay means for turning on and off.

[0009] Further, a refrigerating cycle having a compressor, a four-way valve, an indoor heat exchanger, and an outdoor heat exchanger, which are communicated in an appropriate order by switching the four-way valve, is formed so that the refrigerant flow passage can be appropriately switched. In the multi-function heat pump system described above, the four-way valve and the refrigeration cycle are controlled, and the thermo ON / OFF is controlled according to the room temperature and the room set temperature.
Control means for controlling the compressor frequency by turning it off, the control means setting the target control pressure to the heating thermo O
It is set lower than the target control pressure at the time of FF, and controls the compressor frequency.

A refrigeration cycle having a compressor, a four-way valve, an indoor heat exchanger, and an outdoor heat exchanger, which are connected in an appropriate order by switching the four-way valve, is formed.
By providing a heat exchanger for a heat pump heat source utilizing device in parallel between the outlet side of the compressor and the indoor heat exchanger and between the indoor heat exchanger and the outdoor heat exchanger, a cooling exhaust heat utilization operation is possible by appropriately switching a refrigerant flow passage. In the multifunctional heat pump system according to the present invention, the four-way valve and the refrigeration cycle are controlled and the thermo ON / O is controlled according to the room temperature and the room set temperature.
FF is provided, and the control unit changes the refrigeration cycle from the cooling exhaust heat utilization operation to the single operation of the heat pump heat source utilization device when the thermostat is turned off during the cooling exhaust heat utilization operation. .

The control means changes the refrigeration cycle from the cooling exhaust heat utilization operation to the single operation of the heat pump heat source utilization device within a predetermined time when the thermostat is turned off during the cooling exhaust heat utilization operation. .

A refrigeration cycle having a compressor, a four-way valve, an indoor heat exchanger, and an outdoor heat exchanger, which are connected in an appropriate order by switching the four-way valve, is formed.
A heat exchanger for a heat pump heat source utilizing device is provided in parallel between the outlet side of the compressor and the indoor heat exchanger and between the indoor heat exchanger and the outdoor heat exchanger, and a refrigerant flow control valve and a two-way valve are provided at appropriate places to distribute refrigerant. In a multi-function heat pump system in which a route can be appropriately switched, the multi-function heat pump system further includes control means for controlling the four-way valve and the refrigeration cycle, wherein the control means newly starts operation of another heat exchanger during operation. The compressor is stopped for a predetermined time, and after fully opening the refrigerant flow control valve of the refrigeration cycle including the heat exchanger that has already been operated and newly started operation, the two-way valve is opened to balance the high pressure and the low pressure. is there.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 of the Invention Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram showing a multifunctional heat pump system according to an embodiment of the present invention.
In the figure, 1 is a compressor, 2a, 2b, 2c, 2d are two-way valves that are appropriately opened and closed by operation control means (not shown), 3 is a high-pressure gas pipe connected to the outlet side of the compressor 1, 4
Is a low-pressure gas pipe connected to the suction side of the compressor 1, 5 is a liquid pipe, and 6 is a four-way valve connected to one of the branched high-pressure gas pipes 3.

Reference numeral 7 denotes an outdoor fan of an outdoor heat exchanger 8 connected between the four-way valve 6 and the liquid pipe 5, 9a and 9b denote refrigerant flow control valves for adjusting the flow of refrigerant by means of refrigerant flow control means (not shown), 10 Is an indoor fan of the indoor heat exchanger 11 connected between the four-way valve 6 and the liquid pipe 5, and 12 is for a heat pump heat source utilizing device connected between the other of the branched high-pressure gas pipes 3 and the liquid pipe 5. A heat pump heat source utilization device utilizing heat recovered from the heat exchanger 13, a relay 14 for turning on / off the two-way valve 2d in conjunction with the switching of the four-way valve 6, and a control means 15 for controlling the four-way valve 6. .

The two-way valves 2a, 2b, 2c and 2d are connected between the high-pressure gas pipe 5 and the low-pressure gas pipe 4, one of the branched high-pressure gas pipes 3, the other of the branched high-pressure gas pipes 3 and the liquid pipe 5, respectively. Is provided. Further, the refrigerant flow control means 9a, 9b
Each is provided in a flow path branched from the liquid pipe 5 to the indoor heat exchanger 11 side and the heat pump heat source utilization device heat exchanger 13 side. Further, by switching the four-way valve 6 by operation control means (not shown), the flow path from the compressor 1 to the outdoor heat exchanger 8 and from the indoor heat exchanger 11 to the compressor 1 and the flow path from the compressor 1 to the indoor heat exchanger 11 and Outdoor heat exchanger 8
To the flow path from the compressor to the compressor 1.

Next, various operation modes and their operations will be described. FIG. 2 is a circuit configuration diagram illustrating an operation when the heat pump heat source utilization device 12 uses the exhaust heat of cooling, which is a typical example of the cooling exhaust heat mode. The high-temperature and high-pressure refrigerant gas discharged from the compressor 1 flows from the gas pipe 3 into the heat exchanger 13 for a heat pump heat source utilizing device via the two-way valve 2b.
Here, the refrigerant becomes a high-pressure liquid refrigerant by performing heat exchange with the heat pump heat source utilization device 12, and flows out of the heat pump heat source utilization device heat exchanger 13.

Heat exchanger 13 for heat pump heat source utilizing device
The high-pressure liquid refrigerant that has flowed out further passes through the refrigerant flow control valve 9b and further passes through the refrigerant flow control valve 9a to become a low-pressure two-phase refrigerant and flows into the indoor heat exchanger 11. Here, the low-pressure two-phase refrigerant cools the air by performing heat exchange with the air, and the refrigerant evaporates to become a low-pressure refrigerant gas and flows out of the indoor heat exchanger 11. The low-pressure refrigerant gas flowing out returns to the suction side of the compressor 1 via the four-way valve 6. At this time, since the two-way valves 2a and 2c are closed and 2d is also turned off (de-energized) in synchronization with the four-way valve 6, the two-way valve 2d is closed with respect to the flow in the forward direction. No refrigerant flows through the heat exchanger 8.

Next, the normal cooling only operation mode and its operation will be described. FIG. 3 is a circuit configuration diagram showing an operation in the cooling only operation mode. The high-temperature and high-pressure refrigerant gas discharged from the compressor 1 flows from the gas pipe 3 into the outdoor heat exchanger 8 via the two-way valve 2c and the four-way valve 6. In the outdoor heat exchanger 8, the high-temperature and high-pressure gas refrigerant becomes a high-pressure liquid refrigerant while exchanging heat with outside air while heating the air, and flows out of the outdoor heat exchanger 8.

The high-pressure liquid refrigerant flowing out of the outdoor heat exchanger 8 passes through the liquid pipe 5 through the two-way valve 2d, passes through the refrigerant flow control valve 9a, becomes a low-pressure two-phase refrigerant, and becomes an indoor heat exchanger. 11 flows. At this time, the two-way valve 2d is closed for the flow in the forward direction, but flows normally in the reverse direction due to the pressure difference. Here, the low-pressure two-phase refrigerant cools the air by performing heat exchange with the air, and the refrigerant evaporates to become a low-pressure refrigerant gas and flows out of the indoor heat exchanger 11. The low-pressure refrigerant gas flowing out returns to the suction side of the compressor 1 via the four-way valve 6.

Next, the operation of the simultaneous operation of the heating / heat pump heat source utilization device as the heating operation mode will be described. FIG. 4 is a circuit configuration diagram showing an operation operation when the heating / heat pump heat source utilization device is simultaneously operated. The high-temperature and high-pressure refrigerant gas discharged from the compressor 1 flows into the indoor heat exchanger 11 from the gas pipe 3 via the two-way valve 2c and the four-way valve 6. In the indoor heat exchanger 11, the high-temperature and high-pressure gas refrigerant becomes a high-pressure liquid refrigerant while heating the air by exchanging heat with indoor air, and flows out from the indoor heat exchanger 11. On the other hand, the two-way valve 2b
The high-temperature and high-pressure refrigerant gas flows through the heat exchanger 13 for the heat pump heat source utilizing device.

The refrigerant becomes a high-pressure liquid refrigerant by performing heat exchange with the heat pump heat source utilization device 12, and flows out of the heat pump heat source utilization device heat exchanger 13. here,
The high-pressure liquid refrigerant flowing out of the indoor heat exchanger 11 is connected to the refrigerant flow control valve 9a by the heat exchanger 1 for the heat pump heat source utilizing device.
The high-pressure liquid refrigerant that has flowed out of the line 3 becomes a low-pressure two-phase refrigerant by passing through the refrigerant flow control valve 9b, merges in the liquid pipe 5, passes through the two-way valve 2d that is turned on in synchronization with the four-way valve 6, and passes in the forward direction. It flows into the outdoor heat exchanger 8. Here, the low-pressure two-phase refrigerant exchanges heat with the outside air to cool the air, and the refrigerant evaporates to become a low-pressure refrigerant gas and flows out of the outdoor heat exchanger 8. The low-pressure refrigerant gas flowing out returns to the suction side of the compressor 1 via the four-way valve 6.

The present invention utilizes the characteristics of the two-way valve, which tends to flow in the opposite direction if there is a pressure difference even when the power is not supplied, to the two-way valve 2.
d and the four-way valve 6 are synchronized by one relay 14,
By performing ON / OFF, it is possible to control the refrigerant circuit in the cooling exhaust heat mode, the cooling only operation mode, and the heating mode without any problem in the refrigerant circuit. Therefore, the number of relays is reduced by one to form various refrigeration cycles of the multifunctional heat pump system. it can. Further, as a result, the space for the relay arranged on the substrate can be reduced, so that downsizing and cost reduction can be achieved.

Embodiment 2 of the Invention FIG. 5 is a circuit configuration diagram showing the multifunctional heat pump system according to the embodiment of the present invention. In the case of FIG. 5, a hot water supply unit, a reheating unit, and a bathroom drying unit are provided as a heat pump heat source utilization device. In the drawings, the same or corresponding components as those of the first embodiment of the invention are denoted by the same reference numerals, and description thereof is omitted. 2e is a two-way valve connected to one of the three branched high-pressure gas pipes 3, 9c is a refrigerant flow control valve, 16 is an outdoor unit, 17 is an indoor unit, and 18 is an indoor control unit.

19 is a hot water supply unit, 20 is a hot water storage tank,
21 is a circulation tank for hot water supply, 22 is an indoor heat exchanger, 23 is an indoor control unit, 24 is a reheating unit, 25 is a recirculation pump for reheating, 26 is a reheating heat exchanger, 27 is a reheating control unit, 28 A bathroom drying unit, 29 is a bathroom drying fan, 30 is a bathroom drying heat exchanger, 31 is a bathroom drying control unit, 32 is an indoor remote controller, 33 is a room temperature sensor, and 34 is a bathtub.

Next, various operation modes and their operations will be described. FIG. 2 is a circuit configuration diagram showing an operation in the case of the cooling exhaust heat / hot water supply operation as an example of the cooling exhaust heat mode. A high-temperature and high-pressure refrigerant gas discharged from the compressor 1 is supplied from a gas pipe 3 to a two-way valve 2.
e and flows into the hot water supply heat exchanger 22. On the other hand, the water in the hot water storage tank 20 is sucked from the lower part of the hot water storage tank 20 by the hot water supply circulation pump 21 and flows into the hot water supply heat exchanger 22 having a double pipe structure. Here, the refrigerant becomes a high-pressure liquid refrigerant while heating the circulating water by performing heat exchange with the circulating water, and flows out of the hot water supply heat exchanger 22.

On the other hand, the heated circulating water is supplied to the hot water storage tank 20.
Return to The high-pressure liquid refrigerant flowing out of the hot water supply heat exchanger 22 passes through the refrigerant flow control valve 9b and further passes through the refrigerant flow control valve 9a to become a low-pressure two-phase refrigerant and flows into the indoor heat exchanger 11. Here, the low-pressure two-phase refrigerant cools the air by performing heat exchange with the air, and the refrigerant evaporates to become a low-pressure refrigerant gas and flows out of the indoor heat exchanger 11.
The low-pressure refrigerant gas flowing out returns to the suction side of the compressor 1 via the four-way valve 6. At this time, the two-way valves 2a and 2b are closed, and the two-way valve 2d is also turned off (de-energized) in synchronization with the four-way valve 6, so that the two-way valve 2d is closed with respect to the flow in the forward direction, and the outdoor heat exchange No refrigerant flows into the vessel 8.

Next, the normal cooling only operation mode and its operation will be described. FIG. 7 is a circuit configuration diagram showing an operation operation in the cooling only operation mode. The high-temperature and high-pressure refrigerant gas discharged from the compressor 1 flows from the gas pipe 3 into the outdoor heat exchanger 8 via the two-way valve 2c and the four-way valve 6. Outdoor heat exchanger 8
At this time, the high-temperature and high-pressure gas refrigerant becomes a high-pressure liquid refrigerant while heating the air by exchanging heat with the outside air, and flows out of the outdoor heat exchanger 8.

The high-pressure liquid refrigerant flowing out of the outdoor heat exchanger 8 passes through the liquid pipe 5 through the two-way valve 2d, passes through the refrigerant flow control valve 9a, and becomes a low-pressure two-phase refrigerant. 11 flows. (At this time, the two-way valve 2d is closed for the forward flow, but flows normally due to the pressure difference in the reverse direction. Here, the low-pressure two-phase refrigerant exchanges heat with air. Thus, the air is cooled, and the refrigerant evaporates to become a low-pressure refrigerant gas, and flows out of the indoor heat exchanger 11. The outflowing low-pressure refrigerant gas returns to the suction side of the compressor 1 via the four-way valve 6.

Next, the operation of simultaneous heating and hot water supply operation as the heating operation mode will be described. FIG. 8 is a circuit configuration diagram showing an operation at the time of simultaneous heating and hot water supply operation. The high-temperature and high-pressure refrigerant gas discharged from the compressor 1 is supplied from the gas pipe 3 to the two-way valve 2c.
And flows into the indoor heat exchanger 11 via the four-way valve 6. In the indoor heat exchanger 11, the high-temperature and high-pressure gas refrigerant becomes a high-pressure liquid refrigerant while heating the air by exchanging heat with indoor air, and flows out from the indoor heat exchanger 11.

On the other hand, the high-temperature and high-pressure refrigerant gas flowing through the two-way valve 2e flows into the hot water supply heat exchanger 22. The water in the hot water storage tank 20 is sucked from a lower part of the hot water storage tank 20 by a hot water supply circulation pump 21, and a hot water supply heat exchanger 22 having a double pipe structure is provided.
Flows into. The refrigerant becomes a high-pressure liquid refrigerant while heating the circulating water by performing heat exchange with the circulating water, and flows out of the hot water supply heat exchanger 22. Here, the high-pressure liquid refrigerant flowing out of the indoor heat exchanger 11 passes through the refrigerant flow control valve 9a, and the high-pressure liquid refrigerant flowing out of the hot water supply heat exchanger 22 passes through the refrigerant flow control valve 9b. And flows into the outdoor heat exchanger 8 in the forward direction through the two-way valve 2d turned on in synchronization with the four-way valve 6 in synchronization with the four-way valve 6.

Here, the low-pressure two-phase refrigerant exchanges heat with the outside air to cool the air, and the refrigerant evaporates to a low-pressure refrigerant gas and flows out of the outdoor heat exchanger 8. The low-pressure refrigerant gas flowing out returns to the suction side of the compressor 1 via the four-way valve 6.

The present invention utilizes the characteristics of the two-way valve, which tends to flow in the reverse direction if there is a pressure difference even when the power is not supplied, to the two-way valve 2.
d and the four-way valve 6 are synchronized by one relay 14,
By performing ON / OFF, it is possible to control the refrigerant circuit in the cooling exhaust heat mode, the cooling only operation mode, and the heating mode without any problem in the refrigerant circuit. Therefore, the number of relays is reduced by one to form various refrigeration cycles of the multifunctional heat pump system. it can. Further, as a result, the space for the relay arranged on the substrate can be reduced, so that downsizing and cost reduction can be achieved.

In the embodiment of the present invention, the case where the hot water supply unit 19 is used as the heat pump heat source utilization device has been described, but as shown in FIG.
By controlling the refrigerant flow control valve 9c, the reheating unit 24 and the bathroom drying unit 28 can be used as the heat pump heat source utilization device in the same manner as the hot water supply unit 19.

Embodiment 3 of the Invention FIG. 9 is a block diagram showing a control device of the multifunctional heat pump system according to the embodiment of the present invention. In the figure, the indoor remote controller turns off the heating thermostat to the outdoor control unit via the indoor control unit when the input value of the room temperature sensor is within a predetermined value with respect to the room temperature setting value, and turns on the heating thermostat when the input value is outside the predetermined value. Send the information. The outdoor control unit that receives the information of the heating thermo ON controls the compressor rotation speed so that the value taken in by the high pressure sensor falls within a predetermined value with respect to the target pressure. Other configurations of the multifunctional heat pump system are described in Embodiment 1 of the invention.
The description is omitted.

FIG. 10 is a flowchart showing the operation of the control device configured as shown in FIG. 9, and the operation will be described with reference to FIG. When the heating operation is started, the outdoor control unit sets the compressor frequency to the target control high pressure a ± 1 [kg] at the start of the operation.
f / cm2]. After that, heating is thermo O
When the FF is performed and the thermo-ON is performed again, the compressor frequency is controlled so that the target control high pressure (ab) ± 1 [kgf / cm2]. Thereafter, the difference between the room temperature and the set temperature value is c ° C.
In this case, the target control high pressure is returned to the target control high pressure a at the start of the operation, and the compressor frequency is controlled. When the thermostat is turned off again with a temperature difference within c ° C, the target control high pressure (ab) ± 1 when the heating thermostat is turned on.
The compressor frequency is controlled so as to be [kgf / cm2].

As described above, according to the embodiment of the present invention, during the heating operation, once the heating thermostat is turned off and then the heating thermostat is turned on again, the target control high pressure during the heating alone operation is reduced. By setting b [kgf / cm2] lower than the target control high pressure a [kgf / cm2] when the heating is turned off, the number of times the heating is thermo-ON / OFF is reduced, and the compressor operating frequency is further reduced. Since the high pressure is controlled so as to reach the target pressure, even if the target control high pressure is set lower by b [kgf / cm2], if the indoor load fluctuates, the compressor frequency can be changed to respond. Also,
Since the heating outlet temperature does not significantly change, discomfort to the heating user due to heating thermo ON / OFF and further, discomfort due to a change in the heating outlet temperature can be reduced.

Embodiment 4 of the Invention FIG. 11 is a block diagram showing a control device of the multifunctional heat pump system according to the embodiment of the present invention. In the figure, the indoor remote controller turns off the cooling thermostat to the outdoor control unit via the indoor control unit when the value taken by the room temperature sensor is within a predetermined value with respect to the set temperature, and turns on the cooling thermostat when it is outside the predetermined value. Is transmitted to the outdoor control unit. In addition, the reheating control unit outputs the information of the reheating thermo OFF when the value taken by the bath water temperature sensor is within a predetermined value of the set bath temperature, and the information of the reheating thermo ON when the value is outside the predetermined value. Send to The outdoor control unit that receives these information appropriately switches the operation mode between the cooling only mode, the single reheating mode, and the reheating mode using the cooling exhaust heat. Other configurations and the like of the multifunctional heat pump system are the same as those of the second embodiment of the present invention, and the description is omitted.

FIG. 12 is a flowchart showing the operation of the control device configured as shown in FIG. 11, and the operation will be described with reference to FIG. At the time of cooling exhaust heat additional heating operation, if cooling is thermo OFF, if additional heating thermo is ON,
The indoor control unit and the outdoor control unit switch the refrigeration cycle to the reheating alone mode and perform the reheating alone operation. Cooling is thermo O
If it remains at FF, the reheating alone operation is continued. After that, if the air conditioner remains ON and the air conditioner turns on the thermostat, the air conditioner heats the air, and if the air conditioner is not turned on, the air conditioner immediately turns on the air conditioner until the air conditioner turns on. Stand by in a state where reheating operation can be performed.

As described above, according to the embodiment of the present invention, when the cooling load becomes light during the cooling exhaust heat reheating operation and the reheating capability by the exhaust heat of the cooling becomes insufficient, the cooling is performed. By performing the reheating alone operation using the timing of the thermo OFF, the simultaneous operation of the cooling and the reheating can be realized while the cooling exhaust heat is basically actively used for the reheating.

Embodiment 5 of the Invention FIG. 13 is a flowchart showing the operation of the control device of the multifunctional heat pump system according to another embodiment of the present invention. In the figure,
When the cooling is thermo-off during the cooling-exhaust heat reheating operation, if the reheating thermo is on, the refrigeration cycle is switched to the reheating independent mode and the operation is performed. Thereafter, when the cooling is thermo-ON, the operation is performed by returning the refrigeration cycle to the cooling exhaust heat additional heating mode.

If the cooling remains at the thermo-OFF state, the reheating alone operation is continued. Thereafter, after the reheating alone operation has been performed for a maximum of X minutes which is a predetermined time, if the cooling is turned on while the reheating thermostat is ON, the cooling exhaust heat reheating operation is performed. If the air conditioner is not turned on, the air conditioner waits until the air conditioner is turned on.

As described above, according to the embodiment of the present invention, in the cooling exhaust heat reheating operation, when the cooling load becomes light and the reheating capability by the exhaust heat of the cooling cannot be sufficiently obtained, the cooling is performed. By performing the reheating alone operation using the timing of the thermo-OFF, basically, the cooling exhaust heat is actively used for the re-heating, and furthermore, the predetermined limit is set to the re-heating alone operation at the time of the cooling thermo-OFF. By providing a time, the cooling thermometer is turned on, so that the cooling mode is immediately switched to the cooling mode, thereby eliminating discomfort to the cooling user,
Simultaneous operation of cooling and reheating can be realized.

Embodiment 6 of the Invention FIG. 14 is a circuit diagram showing a multifunctional heat pump system according to an embodiment of the present invention. The configuration of the heat pump system that forms the refrigeration cycle is the same as that of the second embodiment of the invention, and the same or corresponding portions are denoted by the same reference characters and description thereof is omitted. 14 and FIG. 5 lies in the control operation by the control device and the connection of control signals therefor. That is, the connection of the characteristic control signal in the embodiment of the present invention is such that the outdoor control unit 15 controls the compressor 1 and the two-way valve 2
a, is that it is signal-connected to the refrigerant flow control valves 9a, 9b, 9c.

Next, the operation will be described with reference to the timing chart of FIG. When the number of operating vehicles is added,
First, the compressor 1 is stopped, and the units operated before the number of units is added and the refrigerant flow control valves 9a, 9b or 9c on the refrigerant circuit of the added units are fully opened. After 15 seconds, a two-way valve 2a that bypasses high pressure and low pressure
open. The reason why the two-way valve 2a is opened with a time difference is that the sound generated when the refrigerant flows from the high pressure side to the low pressure side when the valve is opened is opened by opening the valve after the high pressure and the low pressure are balanced to some extent. This is because it can be reduced.

Further, when the high pressure and the low pressure are completely balanced 5 seconds after the two-way valve 2a is opened, the two-way valve on the gas pipe side of the additional unit (the two-way valve 2c for an indoor unit, The two-way valve 2b is opened for the unit / bathroom drying / heating unit, and the two-way valve 2e) is opened for the hot water supply unit, and the compressor 1 is operated to perform the combined operation when the number of units is added. As described above, according to the embodiment of the present invention, by performing the above control when the number of operating vehicles is added,
Excessive refrigerant noise generated when the refrigerant flows through the circuit of the additional unit can be reduced.

[0046]

As described above, according to the present invention, there is provided a refrigeration cycle having a compressor, a four-way valve, an indoor heat exchanger and an outdoor heat exchanger, which are connected in an appropriate order by switching the four-way valve. A multi-function in which a heat exchanger for a heat pump heat source utilizing device is provided in parallel with an outlet side of the compressor and between the indoor heat exchanger and the outdoor heat exchanger. In the heat pump system, control means for controlling the four-way valve and the refrigeration cycle, and a two-way valve provided on the liquid side of the outdoor heat exchanger,
Since a relay means for turning on / off the two-way valve in synchronization with the four-way valve is provided, various operation modes can be established with a simple configuration, and an effect that the whole apparatus can be miniaturized can be obtained. can get.

Further, a refrigeration cycle having a compressor, a four-way valve, an indoor heat exchanger, and an outdoor heat exchanger, which are connected in an appropriate order by switching the four-way valve, is formed so that the refrigerant flow passage can be appropriately switched. In the multi-function heat pump system described above, the four-way valve and the refrigeration cycle are controlled, and the thermo ON / OFF is controlled according to the room temperature and the room set temperature.
Control means for controlling the compressor frequency by turning it off, the control means setting the target control pressure to the heating thermo O
Since the compressor frequency is controlled by setting it lower than the target control pressure at the time of FF, it is possible to cope with fluctuations in the indoor load while reducing the frequency of thermo-ON / OFF and to reduce the change in the outlet temperature. Therefore, the effect of improving the comfort of the user can be obtained.

Further, a refrigeration cycle having a compressor, a four-way valve, an indoor heat exchanger, and an outdoor heat exchanger, which are connected in an appropriate order by switching the four-way valve, is formed.
By providing a heat exchanger for a heat pump heat source utilizing device in parallel between the outlet side of the compressor and the indoor heat exchanger and between the indoor heat exchanger and the outdoor heat exchanger, a cooling exhaust heat utilization operation is possible by appropriately switching a refrigerant flow passage. In the multifunctional heat pump system according to the present invention, the four-way valve and the refrigeration cycle are controlled and the thermo ON / O is controlled according to the room temperature and the room set temperature.
FF is provided, and the control unit changes the refrigeration cycle from the cooling exhaust heat utilization operation to the single operation of the heat pump heat source utilization device when the thermostat is turned off during the cooling exhaust heat utilization operation. Even if heat energy can be used efficiently and sufficient capacity cannot be obtained from exhaust heat, energy can be secured by switching operation modes, and operation modes are switched at the time of thermo OFF, so cooling users can be used. The effect of preventing discomfort can be obtained.

When the thermostat is turned off during the cooling exhaust heat utilization operation, the control means changes the refrigeration cycle from the cooling exhaust heat utilization operation to the single operation of the heat pump heat source utilization device within a predetermined time. It can be switched to the cooling exhaust heat utilization operation when the thermo is turned on,
The effect of improving the cooling user comfort is obtained.

Further, a refrigeration cycle having a compressor, a four-way valve, an indoor heat exchanger and an outdoor heat exchanger, which are connected in an appropriate order by switching the four-way valve, is formed.
A heat exchanger for a heat pump heat source utilizing device is provided in parallel between the outlet side of the compressor and the indoor heat exchanger and between the indoor heat exchanger and the outdoor heat exchanger, and a refrigerant flow control valve and a two-way valve are provided at appropriate places to distribute refrigerant. In a multi-function heat pump system in which a route can be appropriately switched, the multi-function heat pump system further includes control means for controlling the four-way valve and the refrigeration cycle, wherein the control means newly starts operation of another heat exchanger during operation. The compressor is stopped for a predetermined time, and after fully opening the refrigerant flow control valve of the refrigeration cycle including the heat exchanger that has already been operated and newly started operation, the two-way valve is opened to balance the high pressure and the low pressure.
When the number of heat exchangers to be operated is increased, an effect of reducing excessive refrigerant noise generated when the refrigerant flows on the added refrigerant circuit can be obtained.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram showing a multifunctional heat pump system according to Embodiment 1 of the present invention.

FIG. 2 is a system diagram in a cooling exhaust heat utilization operation mode of FIG. 1;

FIG. 3 is a system diagram in a cooling only operation mode of FIG. 1;

FIG. 4 is a system diagram in a simultaneous operation mode of the heating / heat pump heat source utilization device of FIG. 1;

FIG. 5 is a circuit configuration diagram showing a multifunctional heat pump system according to Embodiment 2 of the present invention.

FIG. 6 is a system diagram in a cooling exhaust heat utilization operation mode of FIG. 5;

FIG. 7 is a system diagram in the cooling only operation mode of FIG. 5;

FIG. 8 is a system diagram in the simultaneous heating / hot water supply operation mode of FIG. 5;

FIG. 9 is a block diagram illustrating a control device of a multi-function heat pump system according to Embodiment 3 of the present invention.

FIG. 10 is a flowchart showing a control operation of the multifunctional heat pump system according to Embodiment 3 of the present invention.

FIG. 11 is a block diagram showing a control device of a multifunctional heat pump system according to Embodiment 4 of the present invention.

FIG. 12 is a flowchart showing a control operation of the multifunctional heat pump system according to Embodiment 4 of the present invention.

FIG. 13 is a flowchart showing a control operation of the multifunctional heat pump system according to Embodiment 5 of the present invention.

FIG. 14 is a circuit configuration diagram showing a multifunctional heat pump system according to Embodiment 6 of the present invention.

FIG. 15 is a timing chart showing a control operation of the multifunctional heat pump system according to Embodiment 6 of the present invention.

FIG. 16 is an operation diagram showing a conventional control method of an air conditioner for changing a compressor frequency.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2a, 2b, 2c, 2d Two-way valve 6 Four-way valve 8 Outdoor heat exchanger 11, 22 Indoor heat exchanger 12 Heat pump heat source utilizing device 13 Heat exchanger for heat pump heat source utilizing device 14 Relay 15 Control device 23 Indoor control Unit 26 Reheating heat exchanger 27 Reheating control unit 30 Bathroom drying heat exchanger 31 Bathroom drying control unit 32 Indoor remote controller 33 Room temperature sensor

Claims (5)

[Claims] 1. A refrigeration cycle having a compressor, a four-way valve, an indoor heat exchanger, and an outdoor heat exchanger, which are communicated in an appropriate order by switching the four-way valve. In a multifunctional heat pump system in which a heat pump heat source utilizing device heat exchanger is provided in parallel between the indoor heat exchanger and the outdoor heat exchanger, and the refrigerant flow path can be appropriately switched, the four-way valve and the refrigeration cycle are provided. Control means for controlling; a two-way valve provided on the liquid side of the outdoor heat exchanger; and relay means for turning on / off the two-way valve in synchronization with the four-way valve. Control device for multifunctional heat pump system. 2. A refrigeration cycle having a compressor, a four-way valve, an indoor heat exchanger, and an outdoor heat exchanger, which are connected in an appropriate order by switching the four-way valve, so that a refrigerant flow passage can be appropriately switched. In the multifunctional heat pump system, the four-way valve and the refrigeration cycle are controlled, and the thermo ON / OF is controlled according to the room temperature and the room set temperature.
F to control the compressor frequency, and the control means turns off the heating thermostat after the heating thermostat is turned off during the heating operation.
If N, the target control pressure is set to the heating thermo OFF.
A controller for a multi-function heat pump system, wherein the controller controls the compressor frequency by setting the target control pressure lower than the target control pressure at the time of: 3. A refrigeration cycle having a compressor, a four-way valve, an indoor heat exchanger, and an outdoor heat exchanger, which are connected to each other in an appropriate order by switching the four-way valve. In a multi-function heat pump system in which a heat pump heat source utilizing device heat exchanger is provided in parallel between the indoor heat exchanger and the outdoor heat exchanger, and cooling refrigerant heat utilization operation is enabled by appropriately switching a refrigerant flow passage. Controlling the four-way valve and the refrigeration cycle, and turning the thermo ON / OFF according to the room temperature and the room set temperature.
When the thermostat is turned off during the cooling exhaust heat utilization operation, the control means changes the refrigeration cycle from the cooling exhaust heat utilization operation to the single operation of the heat pump heat source utilization device. Control device for multifunctional heat pump system. 4. The control unit changes the refrigeration cycle from the cooling exhaust heat utilization operation to the single operation of the heat pump heat source utilization device within a predetermined time when the thermostat is turned off during the cooling exhaust heat utilization operation. The control device for a multifunctional heat pump system according to claim 3, wherein 5. A refrigeration cycle having a compressor, a four-way valve, an indoor heat exchanger, and an outdoor heat exchanger, which are connected to each other in an appropriate order by switching the four-way valve. A heat pump heat source utilizing device heat exchanger was provided in parallel between the indoor heat exchanger and the outdoor heat exchanger, and a refrigerant flow control valve and a two-way valve were provided in appropriate places to enable switching of the refrigerant flow passage as appropriate. In the multi-function heat pump system, further comprising a control means for controlling the four-way valve and the refrigeration cycle, wherein the control means stops the compressor for a predetermined time when another heat exchanger is newly started during operation. Then, after fully opening the refrigerant flow control valve of the refrigeration cycle including the heat exchanger that has already been in operation and newly started operation, the two-way valve is opened to balance the high pressure and the low pressure. Control system for the pump system.