DE60219753T2 - Heat pump type air conditioning - Google Patents

Description

The The present invention relates to a heat pump type air conditioner and in particular a heat pump type air conditioning system capable of is, an indoor heating operation perform, while she performs an outdoor de-icing operation.

2. Description of the state of the technique

Generally is a heat pump type air conditioner an air conditioner that has both a cooling operation and a heating operation can perform. Since it includes an evaporator and a capacitor, etc., can a heating operation as well as a cooling operation by reversing a Cooling circuit carry out.

1 shows a refrigeration cycle of a conventional heat pump type air conditioning.

The conventional heat pump type air conditioner includes an indoor unit 102 , which is arranged in the interior and performs cooling or heating, and an outdoor unit 104 which is located outside and performs a heat exchange operation.

The indoor unit 102 includes at least one indoor heat exchanger 106 , which is located in each room and performs the cooling or heating operation.

The outdoor unit 104 includes a compressor 108 for compressing a coolant; a four-way valve 110 for switching a flow of refrigerant in the normal or reverse direction; an outdoor heat exchanger 112 which is used as a condenser for cooling and as an evaporator for heating; and an expansion valve 116 attached to a coolant tube 114 is installed to the outdoor heat exchanger 112 with the indoor heat exchanger 106 connect and convert refrigerant gas to a low-temperature, low-pressure state.

There is also a fluid intake 118 for separating the refrigerant into liquid and gas at the rear of the expansion valve 116 installed and a shut-off valve 120 is on the coolant tube 114 between the outdoor heat exchanger 112 and the indoor heat exchanger 106 arranged to the coolant supply to the indoor unit 102 and the coolant delivery to the outdoor unit 104 to open.

An accumulator 122 for converting the refrigerant to a gas state is on a certain side of the compressor 108 installed, and an oil separator 124 is on a discharge side of the compressor 108 Installed.

following will the operation of the conventional Air conditioning of heat pump type described.

First, in the cooling mode, that occurs in the compressor 108 compressed refrigerant gas through the four-way valve 110 , flows into the outdoor heat exchanger 112 , is converted to a state of low temperature and low pressure while passing through the expansion valve 116 flows, and flows into the indoor heat exchanger 106 , That in the indoor heat exchanger 106 evaporated refrigerant gas performs the inside cooling operation while performing heat exchange with inside air and becomes through the four-way valve 110 in the compressor 108 sucked in and circulated again.

In contrast, in heating mode, reversing the flow of coolant flows with the four-way valve 110 that from the compressor 108 discharged coolant gas through the four-way valve 110 in the indoor heat exchanger 106 , is condensed and performs the indoor heating operation while performing the heat exchange with the inside air. Then this is done by the indoor heat exchanger 106 running coolant in a state of low temperature and low pressure offset and through the outdoor heat exchanger 112 evaporated. The vaporized refrigerant gas is passed through the four-way valve 110 in the compressor 108 sucked in and circulated again.

In the heat pump type air conditioner described above, in order to perform a defrosting operation when the cooling operation has been performed for a certain period of time, the outdoor heat exchanger becomes 112 used as a condenser and accordingly melts on the outdoor heat exchanger 112 icing formed by the condensation heat.

There however, the heating operation is interrupted during the defrosting operation is carried out, the room temperature is lowered, causing adverse effects the interior conditions may have.

Further is in the conventional Air conditioning of heat pump type in the case of a multi-type air conditioning system, in which several indoor heat exchangers each in rooms are installed, as any indoor heat exchanger supplied Amount of coolant is equal, a heat exchange capacity each Indoor heat exchanger also the same and accordingly it is impossible, a cooling / heating capacity of the size of each Room to vary accordingly.

The US 6,276,158 FIG. 12 shows a heat pump type air conditioner according to the preamble of claim 1, including a compressor for compressing a refrigerant, a four-way valve for switching a refrigerant flow in normal or reverse direction, first and second outdoor heat exchangers respectively installed outside and as one Capacitor used in cooling and used as an evaporator when heating. The shown air conditioner makes it possible to de-ice an outdoor heat exchanger, while the other performs its normal task, but in a relatively complicated manner.

Summary the invention

to solution In the problem described above, it is an object of the present invention Invention to provide a heat pump type air conditioning system which is able to maintain a constant room temperature, by having two outdoor heat exchangers be included, and a heating operation with one as an evaporator acting heat exchanger perform, if the other heat exchanger performs a defrosting operation in a simplified manner.

In It is a multi-type air conditioning system that includes multiple indoor heat exchangers Another object of the present invention is an air conditioner of heat pump type to provide a cooling / heating power by changing a Heat exchange performance every indoor heat exchanger according to a Size of each room to improve.

A Includes heat pump type air conditioning a compressor for compressing a refrigerant; a four-way valve for switching a coolant flow in normal or reverse direction; a first and a second Outdoor heat exchanger, each outside are installed and when cooling be used as a condenser and when heating as an evaporator be used; several indoor heat exchangers, each in each interior are installed and perform a cooling / heating operation; one first and a second outdoor expansion valve, each in coolant tubes are installed to the first and the second outdoor heat exchanger with the indoor heat exchangers to connect to the coolant into a state of low temperature and low pressure and the coolant tubes to open / close shut down; a control unit to connect either the first or the second outdoor heat exchanger Perform de-icing operation to let the others do a heating operation leave by controlling the first and the second outdoor expansion valve become; and several indoor expansion valves installed in the inner coolant tubes are and adjust a varying amount of coolant, which flows into the several indoor heat exchangers.

The Four-way valve includes a first port, which has a discharge side the compressor is connected; a second port through a first coolant tube with the indoor heat exchangers connected is; a third port through a second and third coolant tube connected to the first and second outdoor heat exchangers; and a fourth port connected to a suction side of the compressor connected is; during the cooling operation the first port is in communication with the third port and the second port communicates with the fourth port and in heating mode, the first port to the second port and the third port communicates with the fourth port stands.

The second coolant tube connects the first outdoor heat exchanger to the four-way valve fourth coolant tube connects the first outdoor heat exchanger with the indoor heat exchangers, a sixth coolant tube connects the fourth coolant tube with the second port of the four-way valve and a first valve is in the sixth coolant tube installed it in accordance with a transmitted from the control unit to open electrical signal or close.

The first valve is a solenoid type for opening the sixth coolant pipe according to one from the control unit applied electrical signal.

The third coolant tube connects the second outdoor heat exchanger to the four-way valve fifth Coolant pipe connects the second outdoor heat exchanger with the indoor heat exchangers, a seventh coolant tube connects the fifth Coolant pipe with the second port of the four-way valve and a second valve is in the seventh coolant tube installed it in accordance with a transmitted from the control unit to open electrical signal or close.

The second valve is a solenoid type for opening the seventh coolant tube according to one from the control unit applied electrical signal.

The Control unit opens the sixth coolant tube by operation of the first valve and closes the fourth coolant tube by pressing the first outdoor expansion valve in the de-icing operation of the first outdoor heat exchanger.

The control unit opens the seventh coolant tube by operating the second valve and closes the fifth coolant tube by operating the second outer expansion valve at the outlet sungsbetrieb the second outdoor heat exchanger.

Summary the drawings

The accompanying drawings, which further understand the Invention are included and included in this description are and form part of the same, represent embodiments of the invention and serve in conjunction with the description to explain the principles of the invention.

In the drawings shows:

1 a structure of a cooling circuit and a heat pump type air conditioning system according to the prior art;

2 a structure of a refrigeration cycle of a heat pump type air conditioner in accordance with the present invention;

3 a block diagram showing a control structure of the heat pump type air conditioning system according to the present invention; and

4 and 5 schematic diagrams showing the cooling circuit of the heat pump type air conditioning system according to the present invention.

Detailed description the preferred embodiment

following becomes the preferred embodiment an air conditioner of heat pump type in accordance with the present invention with reference to the attached Drawings described.

It can several embodiments an air conditioner of heat pump type in accordance with the present invention, of which the following maximum preferred embodiment is described.

2 Fig. 12 illustrates a structure of a refrigeration cycle of a heat pump type air conditioner according to the present invention.

The heat pump type air conditioner according to the present invention comprises an indoor unit 2 , which is installed in the interior and performs a cooling or a heating operation; an outdoor unit 4 , which is installed outside and through a coolant pipe with the indoor unit 2 is connected and performs a heating process; and a control unit 6 each controlling a cooling operation, a heating operation and a defrosting operation.

The indoor unit 2 contains several indoor heat exchangers 8a . 8b , which are installed in each interior; and several indoor expansion valves 10a . 10b for converting the refrigerant to a low-temperature, low-pressure state and adjusting a flow rate of each indoor heat exchanger 8a . 8b supplied coolant.

The outdoor unit 4 includes a compressor 12 for compressing the coolant; a four-way valve 14 for switching a flow of refrigerant in a normal direction or a reverse direction; a first and a second outdoor heat exchanger 16 . 18 which are used as a condenser in a cooling operation and as an evaporator in a heating operation; and a first and a second outdoor expansion valve 20 . 22 , which are respectively installed on coolant tubes, the first and the second heat exchanger 16 . 18 with the indoor heat exchangers 8a . 8b connect and convert the refrigerant gas in a state of low temperature and low pressure and open / close the coolant tubes.

An accumulator 24 for sucking the coolant is on a suction side of the compressor 12 installed and an oil separator 26 is on a discharge side of the compressor 12 Installed.

A fluid intake 28 is connected to the coolant tubes, the first and the second outer heat exchanger 16 . 18 with the indoor heat exchangers 8a . 8b connect.

The four-way valve 14 includes a first port 30 , with the discharge side of the compressor 12 connected is; a second connection 32 that with the indoor heat exchangers 8a . 8b connected is; a third connection 34 connected to the first and second outdoor heat exchangers 16 . 18 connected is; and a fourth connection 36 , which is connected to the suction part of the compressor 12 connected is.

In the cooling operation, the coolant flows in the normal direction because the four-way valve 14 the second connection 32 and the fourth connection 36 each with the first connection 30 and the third port 34 combines. In the heating operation, the coolant flows in the reverse direction, because the four-way valve 14 the first connection 30 and the second port 32 each with the third port 34 and the fourth connection 36 combines.

A first coolant tube 40 connects the second port 32 of the four-way valve 14 with the indoor heat exchangers 8a . 8b , a second coolant tube 42 connects the third port 34 with the first outdoor heat exchanger 16 and a third coolant tube 44 connects the third port 34 with the second outdoor heat exchanger 18 ,

A fourth coolant tube 46 connects the first outdoor heat exchanger 16 with the indoor heat exchangers 8a . 8b and a fifth coolant tube 48 connects the second outdoor heat exchanger 18 with the indoor heat exchangers 8a . 8b , A first outdoor expansion valve 20 is in the fourth coolant tube 46 installed and a second outdoor expansion valve 22 is in the fifth coolant tube 48 Installed.

The fourth coolant tube 46 and the fifth coolant tube 48 connect and are with the fluid intake 28 connected, and several indoor expansion valves 10a . 10b are installed in the coolant tubes that absorb the fluid 28 with every indoor heat exchanger 8a . 8b connect.

A shut-off valve 52 for interrupting a coolant flow is installed in each case in an intake pipe and a discharge pipe, which with the inner heat exchangers 8a . 8b connected is.

A sixth coolant tube 54 connects the fourth coolant tube 46 with the first coolant tube 40 and a seventh coolant tube 56 connects the fifth coolant tube 48 with the first coolant tube 40 , A first valve 58 is in the sixth coolant tube 54 installed to open / close, and a second valve 60 is in the seventh coolant tube 56 installed to open / close it.

This corresponds to the first and the second valve 58 . 60 preferably the solenoid type, around the sixth and seventh coolant tubes, respectively 54 . 56 each open when from the control unit 6 an electrical signal is applied.

3 Fig. 10 is a block diagram illustrating a control structure of the heat pump type air conditioner according to the present invention.

As 3 shows, the heat pump type air conditioner according to the present invention comprises an operation selection unit 70 which is operated by a user; a first detection unit 72 for detecting whether the first outdoor heat exchanger 18 covered with icing not lower than a set value; a second detection unit 74 for detecting whether the second outdoor heat exchanger 18 covered with icing not lower than a set value; and a control unit 6 for performing the cooling operation, the heating operation and the defrosting operation in accordance with one of the operation selection unit 70 , the first and the second detection unit 72 . 74 transmitted signal.

Various types of sensors, such as a temperature sensor, etc., may be attached to the first and second detection units 72 . 74 can be applied, and any method that is capable of detecting whether the first outdoor heat exchanger 16 and the second outdoor heat exchanger 18 covered with icing.

The control unit 6 performs switching between cooling / heating by operating the four-way valve 14 in accordance with the operation of the operation selection unit 70 by. The control unit 6 either leaves the first outdoor heat exchanger 20 or the second outdoor heat exchanger 22 perform the defrosting operation and let the other one perform the heating operation according to that of the first and second detection units 72 . 74 received signal.

If the user by pressing the Betriebsauswahleinheit 70 the cooling / heating capacity of each indoor heat exchanger 8a . 8b adjusts the control unit 6 the every indoor heat exchanger 8a . 8b supplied amount of coolant by the opening of the internal expansion valves 10a . 10b is adjusted.

Of the Operation of the heat pump type air conditioning system according to the present Invention will be described below.

Initially connects in cooling mode, as in 2 shown when the user by operating the Betriebsauswahleinheit 70 selects the cooling mode, the control unit 6 by operation of the four-way valve 14 each the second port 32 and the fourth connection 36 with the first connection 30 and the third port 34 , The first and the second valve 58 . 60 stay in the closed state.

If in this condition the compressor 12 is actuated, the compressed refrigerant flows into the first port 30 of the four-way valve 14 , will be at the third port 34 discharged in each case flows into the first outdoor heat exchanger 16 and the second outdoor heat exchanger 18 through the second and third coolant tubes 42 . 44 and performs the heat exchange. The coolant leaving the heat exchangers becomes the fourth and fifth coolant tubes 46 . 48 is discharged, it is converted to the state of low temperature and low pressure, while it is the first and the second outdoor expansion valve 20 . 22 flows through, and flows into each indoor heat exchanger 8a . 8b , That in every indoor heat exchanger 8a . 8b evaporated refrigerant gas completes the interior cooling while it ei exchanges with the internal air, flows into the second port 32 of the four-way valve 14 through the first coolant tube 40 , will be in the third port 34 discharged, flows into the compressor 12 , is compressed and accordingly the coolant is recirculated.

4 FIG. 12 is a schematic diagram illustrating the heating operation of the heat pump type air conditioning system according to the present invention. FIG.

If the user by pressing the Betriebsauswahleinheit 70 selects the heating mode, connects the control unit 6 the first connection 30 of the four-way valve 14 with the second connection 32 , connects the third port 34 with the fourth connection 36 , and accordingly, the refrigerant flows in the reverse direction. Here are the first valve 58 and the second valve 60 in the closed state.

That by the operation of the compressor 12 compressed coolant flows into the first port 30 of the four-way valve 14 , will be in the second port 32 discharged, flows through the first coolant tube 40 in the indoor heat exchanger 8a . 8b is condensed and performs the heat exchange with the inside air, and accordingly, the indoor heating is performed. That through the inside heat exchanger 8a . 8b flowing coolant is placed in the low temperature and low pressure state while passing through the inner expansion valves 10a . 10b , the first and the second outdoor expansion valve 10a . 10b flows, and is vaporized while passing through the fourth and fifth coolant tubes 46 . 48 through the first and second outdoor heat exchangers 16 . 18 occurs. The evaporated coolant flows again into the third port 34 of the four-way valve 14 , will be in the fourth port 36 is discharged into the compressor 12 sucked, and accordingly, the coolant is circulated again.

In the above-described cooling / heating operation, in the case of a different cooling / heating capacity, the indoor heat exchanger installed in each indoor space 8a . 8b according to the size of the interior, when the user has a heat exchange capacity of a respective indoor heat exchanger 8a . 8b by operating the operation selection unit 70 selects the control unit 6 the opening of each indoor expansion valve 10a . 10b in accordance with the signal of the operation selection unit 70 a to regulate a flow rate of the coolant, which is any indoor heat exchanger 8a . 8b is supplied, so that accordingly the cooling / heating capacity can be adjusted.

Of the De-icing operation of the air conditioner according to the present invention is described below.

5 FIG. 12 is a schematic diagram illustrating the defrosting operation of the heat pump type air conditioner according to the present invention. FIG.

If the control unit 6 upon receipt of the first or second detection unit 72 . 74 When the transmitted signal is detected that one of the outdoor heat exchangers is covered with icing not lower than the preset value, it allows the icing-covered outdoor heat exchanger to perform the defrosting operation and allows the other to perform the heating operation, thereby eliminating the remaining outdoor heat exchanger as an evaporator works.

For example, as in 5 shown in the heating operation by that of the first detection unit 72 received signal detected whether the first outdoor heat exchanger 16 requires the defrosting operation (which means that the first outdoor heat exchanger 16 covered with an icing not below the set value), and the control unit 6 opens the sixth coolant tube 54 by actuating the first valve 58 and closes the fourth coolant tube 46 by actuating the first outdoor expansion valve 20 ,

Then that will be in the compressor 12 compressed coolant into the second port 32 of the four-way valve 14 discharged and through the first coolant tube 40 every indoor heat exchanger 8a . 8b supplied. Part of the second connection 32 discharged coolant is through the sixth coolant tube 54 the first outdoor heat exchanger 16 supplied, is condensed and performs the de-icing operation. This after completing the de-icing operation of the first outdoor heat exchanger 16 discharged coolant flows through the second coolant tube 42 and the four-way valve 14 in the compressor 12 , In this case, the second outdoor heat exchanger leads 18 the normal heating operation, that is, he works as an evaporator, in the same manner as in the heating operation described above.

As described above, even in the defrosting operation of the first outdoor heat exchanger 16 the second outdoor heat exchanger 18 the normal heating operation, that is, he works as an evaporator, and accordingly, the indoor heating can be carried out continuously.

When it is determined that the second outdoor heat exchanger 18 requires the defrosting operation, opens the control unit 6 the seventh coolant tube 56 by actuating the second valve 60 and closes the fifth coolant tube 48 through beta tion of the second outdoor expansion valve 60 ,

Then that will be in the compressor 12 compressed coolant into the second port 32 of the four-way valve 14 is discharged through the first coolant tube 40 every indoor heat exchanger 8a . 8b supplied. Part of the second connection 32 discharged coolant is through the seventh coolant tube 56 the second outdoor heat exchanger 18 supplied, is condensed and carried out the de-icing operation. This after completion of the defrost operation of the second outdoor heat exchanger 18 discharged coolant flows again through the third coolant tube 44 and the four-way valve 14 in the compressor 12 , In this case, the first outdoor heat exchanger 16 perform the heating operation normally, that is, as an evaporator worked, in the same manner as in the above-described heating operation.

As As described above, in the heat pump type air conditioner according to the present Invention by the incorporation of an internal expansion valve on each Indoor heat exchanger a cooling / heating capacity accordingly the size of one Interior can be varied by adding each indoor heat exchanger supplied coolant quantity by adjusting the opening every indoor expansion valve is regulated.

Further This can be done by having two outdoor heat exchangers are provided, when an outdoor heat exchanger the defrosting operation performs, the other perform the heating operation, so that by a Room temperature can be maintained constant and, accordingly, the conditions can be kept pleasant in the interior.

Claims (9)

Heat pump type air conditioning system comprising: a compressor ( 12 ) for compressing a coolant; a four-way valve ( 14 ) for switching a flow of refrigerant in the normal or reverse direction; a first and a second outdoor heat exchanger ( 16 . 18 ) each installed on the outside and used as a condenser in cooling and used as an evaporator in heating; characterized in that the air conditioner further includes: a plurality of indoor heat exchangers ( 8a . 8b ), which are installed in each interior space and perform a cooling / heating operation; a first and a second outdoor expansion valve ( 20 . 22 ), each in coolant tubes ( 46 . 48 ) are installed to the first and the second outdoor heat exchanger ( 16 . 18 ) with the indoor heat exchangers ( 8a . 8b ) to convert the refrigerant to a low-temperature, low-pressure state and the refrigerant tubes ( 46 . 48 ) to open / close; Coolant pipes ( 54 . 56 ) with a first ( 58 ) and a second ( 60 ) Valve containing the outdoor heat exchanger ( 16 . 18 ) with each other and with the compressor ( 12 ) connect; and a control unit ( 6 ) to either the first or the second outdoor heat exchanger ( 16 . 18 ) to perform a defrost operation and the other a heating operation, wherein the remaining outdoor heat exchanger operates as an evaporator by the first and the second outdoor expansion valve ( 20 . 22 ), the four-way valve ( 14 ) and the first and second valves ( 58 . 60 ) to be controlled. The air conditioner of claim 1, further comprising: a plurality of indoor expansion valves ( 10a . 10b ) installed in the inner coolant tubes to individually adjust an amount of refrigerant discharged into the plurality of indoor heat exchangers (FIGS. 8a . 8b ) flows. Air conditioning system according to claim 1, in which the four-way valve ( 14 ) comprises: a first port ( 30 ) connected to a discharge side of the compressor ( 12 ) connected is; a second connection ( 32 ) passing through a first coolant tube ( 40 ) with the indoor heat exchangers ( 8a . 8b ) connected is; a third connection ( 34 ) through a second and a third coolant pipe ( 42 . 44 ) with the first and the second outdoor heat exchanger ( 16 . 18 ) connected is; and a fourth port ( 36 ) connected to a suction side of the compressor ( 12 ) connected is; wherein in cooling mode the first port ( 30 ) with the third connection ( 34 ) and the second port ( 32 ) with the fourth connection ( 36 ) and in heating mode the first connection ( 30 ) with the second connection ( 32 ) and the third port ( 34 ) with the fourth connection ( 36 ). The air conditioner of claim 1, wherein the second coolant tube (10) 42 ) the first outdoor heat exchanger ( 16 ) with the four-way valve ( 14 ), a fourth coolant tube ( 46 ) the first outdoor heat exchanger ( 16 ) with the indoor heat exchangers ( 8a . 8b ), a sixth coolant tube ( 54 ) the fourth coolant tube ( 46 ) with the second connection ( 32 ) of the four-way valve ( 14 ) and a first valve ( 58 ) in the sixth coolant tube ( 54 ) is installed in accordance with one of the control unit ( 6 ) to open or close the transmitted electrical signal. Air conditioning system according to claim 4, wherein the first valve ( 58 ) a solenoid type for opening the sixth coolant tube ( 54 ) according to one of the control unit ( 6 ) is applied electrical signal. Air conditioning system according to claim 1, wherein the third coolant pipe ( 44 ) the second outdoor heat exchanger ( 18 ) with the four-way valve ( 14 ), a fifth coolant tube ( 48 ) the second outdoor heat exchanger ( 18 ) with the indoor heat exchangers ( 8a . 8b ), a seventh coolant tube ( 56 ) the fifth coolant tube ( 48 ) with the second connection ( 32 ) of the four-way valve ( 14 ) and a second valve ( 60 ) in the seventh coolant tube ( 56 ) is installed in accordance with one of the control unit ( 6 ) to open or close the transmitted electrical signal. Air conditioning system according to claim 6, wherein the second valve ( 60 ) a solenoid type for opening the seventh coolant tube ( 56 ) according to one of the control unit ( 6 ) is applied electrical signal. Air conditioning system according to claim 4, in which the control unit ( 6 ) in the de-icing operation of the first outdoor heat exchanger ( 16 ) the sixth coolant tube ( 54 ) by actuating the first valve ( 58 ) and the fourth coolant tube ( 46 ) by actuation of the first outer expansion valve ( 20 ) closes. Air conditioning system according to claim 6, in which the control unit ( 6 ) in the de-icing operation of the second outdoor heat exchanger ( 18 ) the seventh coolant tube ( 56 ) by actuating the second valve ( 6O ) and the fifth coolant tube ( 48 ) by actuation of the second outer expansion valve ( 22 ) closes.