KR20070075119A - Heat Pump Air Conditioning Unit - Google Patents

Abstract

A heat pump type air conditioner is provided to prevent cooling performance degradation by discharging cooling air of the inside of an air conditioning duct cooled by an indoor cooling heat exchanger to a car room while maintaining the same temperature. A heat pump type air conditioner comprises a compressor(100), an indoor heating heat exchanger(520), a first expansion valve(700), an outdoor heat exchanger(200), a liquid receiver(400), an internal heat exchanger(300), an indoor cooling heat exchanger(510), a second expansion valve(710), a first bypass valve(600) and a second bypass valve(610). The compressor compresses and discharges refrigerant. The indoor heating heat exchanger is installed in an air conditioning duct(500), and heats air while high temperature and pressure refrigerant discharged from the compressor is cooled. The first expansion valve throttles the refrigerant discharged from the indoor heating heat exchanger, and is opened at a heating mode and closed at a cooling mode. The liquid receiver sends gas phase refrigerant to the compressor. The internal heat exchanger heat-exchanges refrigerant discharged from the outdoor heat exchanger with refrigerant discharged from the liquid receiver. The indoor cooling heat exchanger is arranged inside the air conditioning duct corresponding to a front side of the indoor heating heat exchanger. The second expansion valve is closed during heating operation. The first bypass valve changes direction so that refrigerant discharged from the compressor flows into the indoor heating heat exchanger at a heating mode. The second bypass valve changes direction so that refrigerant passing through the internal heat exchanger flows into the liquid receiver.

Description

Heat Pump Air Conditioning Unit {HEAT PUMP TYPE AIR CONDITIONER}

1A and 1B are views related to the prior art;

2 is a view showing a refrigerant flow in the cooling mode in the heat pump type air conditioner according to the present invention.

3 is a view showing the refrigerant flow in the heating mode in the heat pump type air conditioner according to the present invention.

4 is a view showing the refrigerant flow in the dehumidification mode in the heat pump type air conditioner according to the present invention.

<Explanation of symbols for the main parts of the drawings>

100: compressor

200: outdoor heat exchanger

300: internal heat exchanger

400: receiver

500: air conditioning duct

510: indoor heat exchanger for cooling

520: Indoor heat exchanger for heating

521: Temperature control door

600: first bypass valve

610: second bypass valve

700: first expansion valve

710: second expansion valve

The present invention relates to a heat pump type air conditioner, and more particularly to a compressor, an outdoor heat exchanger, an internal heat exchanger, a receiver and a cooling indoor heat exchanger and a heating indoor heat exchanger respectively installed in an air conditioning duct; A heat pump type air conditioner having a refrigerant circulation circuit composed of at least one expansion valve, wherein the refrigerant at high temperature and high pressure discharged to the compressor in the cooling mode does not flow to a heating indoor heat exchanger installed in an air conditioning duct. The cooling air in the air conditioning duct cooled by the indoor heat exchanger is to be discharged into the vehicle room while maintaining its own temperature to prevent a decrease in cooling performance.

In general, a vehicle air conditioning system includes a cooling system and a heating system. A typical cooling system is a heat exchange medium discharged by the operation of a compressor, the refrigerant is circulated through the condenser, the receiver dryer, the expansion valve and the evaporator and then circulated back to the compressor. By supplying, it is a system which cools the interior of a vehicle. In addition, a typical heating system is a system for heating the interior of a vehicle by supplying heat to the vehicle by heat-exchanging blower air from the heater core where the cooling water for cooling the heat generated by the engine circulates and supplying it to the interior of the vehicle. Applies to engine vehicles.

By the way, when heating the vehicle in cold weather, it takes a considerable time from when the engine is started until the coolant is heated, there is a problem that the initial heating efficiency is lowered.

In order to solve this problem, the air conditioning system which heats using the heat of a refrigerant | coolant, without heating air using the heat of an engine, is developed. Such an air conditioning system is generally configured to enable switching of cooling / heating modes by using components constituting an existing refrigeration cycle, for cost reduction and compact design.

However, in such an air conditioning system, for example, in a cold weather of -20 ° C to -30 ° C and using a refrigerant such as R134 as a heat exchange medium to heat the temperature inside the vehicle to 10 ° C or higher, the refrigerant compression ratio in the compressor is It becomes large, which causes a problem that the capacity and performance of the compressor must be large.

On the other hand, in the case of an air conditioning system for an electric vehicle, unlike the internal combustion engine vehicle, since a heater core through which cooling water is circulated is not used, the configuration is different from that of an internal combustion engine vehicle air conditioning system. The air pump air conditioning system is applied to an electric vehicle.

Therefore, due to the low compression ratio and the excellent compression efficiency and the excellent heat transfer characteristics, a refrigerant such as carbon dioxide can be used, and a cooling / heating mode can be switched and can be applied to an electric vehicle as well as an internal combustion engine vehicle. As the system has been actively studied recently, there is a heat pump type air conditioner which is Japanese Patent Laid-Open No. 2001-27455 and Japanese Patent Laid-Open No. 2005-98660.

Here, the member number located in front of the member number written in the following components corresponds to Fig. 1 (a) associated with Japanese Patent Laid-Open No. 2001-27455, and the member number located behind is Japanese Patent Laid-Open No. 2005 It corresponds to FIG. 1 (b) related to -98660, and the numbers other than the member numbers described below among the member numbers indicated in FIG. 1 (a) (b) will not be described for convenience.

The conventional technology is that the high pressure gas refrigerant discharged from the compressor (44) (2) in the cooling mode passes through the internal gas cooler (14) (3) located inside the air conditioning duct (1) (8) And blowing means (6) (not shown) via an outdoor gas cooler (26) (4) acting as a condenser and then passing through an evaporator (13) (6) located inside the air conditioning duct (2) (8). It is possible to supply cold air into the vehicle interior by a heat exchange action that absorbs heat from outside air or inside air blown by the air.

However, since the refrigerant gas in the high temperature and high pressure state discharged from the compressors 44 and 2 is circulated into the internal gas cooler 14 and 3, the conventional technology is carried out by the evaporator 13 and 6 in the cooling mode. The cold air in the cooled air conditioning ducts 2 and 8 exchanges heat with the heat radiated from the internal gas cooler 14 and 3 to generate a heat pick-up phenomenon discharged into the interior of the vehicle in a state where the temperature is raised. There was a problem that performance is reduced.

In Japanese Patent Application Laid-Open No. 2005-98660 of the prior art, as shown in FIG. 1 (b), since the system is complicated, the refrigerant is transferred from the compressor 2 to the internal gas cooler 9. The flow is the same in the heating mode and the cooling mode, but the remaining components except the compressor (2) and the internal gas cooler (9) is configured such that the refrigerant flow path is not made in one direction when switching between the heating mode and the cooling mode There was also a problem that a circulation failure of the refrigerant occurs.

The present invention has been made to solve the above problems, and includes a compressor, an outdoor heat exchanger, an internal heat exchanger, a receiver and a cooling indoor heat exchanger and a heating indoor heat exchanger respectively installed in an air conditioning duct, and at least one expansion. A heat pump type air conditioner having a refrigerant circulation circuit composed of a valve, wherein the refrigerant in a high temperature and high pressure state discharged to a compressor in a cooling mode is prevented from flowing to a heating indoor heat exchanger installed in an air conditioning duct. It is an object of the present invention to prevent cold air in the air-conditioning duct cooled by being discharged into the vehicle compartment while maintaining its temperature.

The present invention for achieving the above object is a compressor for compressing and discharging the sucked refrigerant; An indoor heat exchanger installed in the air conditioning duct and configured to heat air while cooling the high temperature and high pressure refrigerant discharged from the compressor; A first expansion valve which throttles the refrigerant discharged from the heating indoor heat exchanger, is closed in the cooling mode and is opened in the heating mode; An outdoor heat exchanger (200) for cooling the refrigerant having a high temperature and high pressure discharged from the compressor or the refrigerant discharged from the first expansion valve; A receiver for sending only a gaseous refrigerant to the compressor; An internal heat exchanger configured to exchange heat between the refrigerant discharged from the outdoor heat exchanger and the refrigerant discharged from the receiver; It is disposed in the air conditioning duct corresponding to the front side of the indoor heat exchanger for heating, and is discharged from the outdoor heat exchanger side to evaporate the refrigerant passing through the internal heat exchanger to cool the surrounding air and to transfer the fluid to allow the refrigerant to be transferred. An indoor heat exchanger for cooling connected to the machine; A second expansion valve which throttles the refrigerant flowing into the cooling indoor heat exchanger, is opened in the cooling mode and is closed during the heating operation; A first bypass valve which redirects the refrigerant discharged from the compressor to the outdoor heat exchanger in the cooling mode, and redirects the refrigerant discharged from the compressor to the indoor heat exchanger for heating in the heating mode; In the cooling mode, the refrigerant flowing in the outdoor heat exchanger and passing through the internal heat exchanger is redirected to flow to the indoor heat exchanger for cooling, and in the heating mode, the refrigerant flowing in the outdoor heat exchanger and passed through the internal heat exchanger. It characterized in that it comprises a second bypass valve for changing the direction to flow to the receiver without passing through the cooling indoor heat exchanger.

Hereinafter, a preferred embodiment of a heat pump type air conditioner according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a view showing the refrigerant flow in the cooling mode in the heat pump type air conditioner according to the present invention, Figure 3 is a view showing the refrigerant flow in the heating mode in the heat pump type air conditioner according to the present invention, 4 is a view showing the refrigerant flow in the dehumidification mode in the heat pump type air conditioner according to the present invention.

With reference to the accompanying drawings will be described a preferred embodiment of the present invention.

The present invention, the compressor 100, the outdoor heat exchanger 200, the internal heat exchanger 300, the receiver 400, the air conditioning duct 500, the cooling indoor heat exchanger 510, for heating The indoor heat exchanger 520, the first bypass valve 600, the second bypass valve 610, the first expansion valve 700, and the second expansion valve 710 constitute a refrigerant circulation circuit. do.

First, the compressor 100 compresses the sucked refrigerant and discharges it at a high temperature and high pressure.

The indoor heat exchanger 520 is installed in the air conditioning duct 500 and heats the air while cooling the refrigerant having a high temperature and high pressure discharged from the compressor.

The first expansion valve 700 throttles the refrigerant discharged from the heating indoor heat exchanger 520, and closes in the cooling mode and opens in the heating mode.

The outdoor heat exchanger 200 cools the high temperature and high pressure refrigerant discharged from the compressor 100 or the refrigerant discharged from the first expansion valve 700.

The receiver 400 sends only the refrigerant in the gas phase to the compressor 100.

The internal heat exchanger 300 heat-exchanges the refrigerant discharged from the outdoor heat exchanger 200 and the refrigerant discharged from the receiver 400.

The cooling indoor heat exchanger 510 is disposed in the air conditioning duct 500 corresponding to the front side of the heating indoor heat exchanger 520, and is discharged from the outdoor heat exchanger 200 to discharge the internal heat exchanger. It is configured to be connected to the receiver 400 to cool the surrounding air by evaporating the refrigerant via the 300 and to transfer the refrigerant.

The second expansion valve 710 acts to throttle the refrigerant flowing into the cooling indoor heat exchanger 510, to open in the cooling mode, and to close in the heating operation.

The first bypass valve 600 redirects the refrigerant discharged from the compressor 100 to the outdoor heat exchanger 200 in the cooling mode and discharges the compressor 100 in the heating mode. The refrigerant is redirected to flow to the heating indoor heat exchanger 520.

In the cooling mode, the second bypass valve 610 changes direction such that the refrigerant flowing in the outdoor heat exchanger 200 and passing through the internal heat exchanger 300 flows to the cooling indoor heat exchanger 510. In addition, in the heating mode, the refrigerant flowing in the outdoor heat exchanger 200 and passing through the internal heat exchanger 300 flows to the receiver 400 without passing through the cooling indoor heat exchanger 510. You will be redirected.

Meanwhile, the present invention can be applied to a dehumidification mode as well as a heating and cooling mode. In this dehumidification mode, the first bypass valve 600 is closed and the first expansion valve 700 is opened. The pass valve 610 is closed and the second expansion valve 710 is controlled to open.

And, in the configuration of the present invention as described above, the relationship between the amount of air passing through the cooling indoor heat exchanger 510 and the heating indoor heat exchanger 520 installed in the air conditioning duct 500 is; All the air first introduced into the air conditioning duct 500 passes through the cooling indoor heat exchanger 510, and a temperature control door 521 between the cooling indoor heat exchanger 510 and the heating indoor heat exchanger 520. Only a part of the air passing through the cooling indoor heat exchanger 510 passes through the heating indoor heat exchanger 520, while the rest is bypassed through the bypass passage.

The operation of the present invention configured as described above will be described separately by cooling mode, heating mode, dehumidification mode.

<Cooling mode>

As shown in FIG. 1, the first bypass valve 600 and the second expansion valve 710 are in an open state, and the second bypass valve 610 and the first expansion valve 700 are in a closed state. to be. And, the temperature control door 521 is positioned so that the air passing through the cooling indoor heat exchanger 510 passes by bypass without passing through the heating indoor heat exchanger 520.

When the compressor 100 operates in the above state, the high temperature and high pressure refrigerant compressed and discharged by the compressor 100 is condensed while passing through the outdoor heat exchanger 200 after passing through the first bypass valve 600. After passing through the internal heat exchanger 300, the second expansion valve 710 is introduced into the cooling indoor heat exchanger 510.

The refrigerant introduced into the indoor heat exchanger 510 for cooling takes heat from the air while being exchanged with air passing through the air conditioning duct 500, and the evaporated refrigerant passes through the receiver 400. After passing through the receiver 400, only the refrigerant in the gaseous state is exchanged with the refrigerant introduced from the outdoor heat exchanger 200 in the internal heat exchanger 300, and then sucked back into the compressor 100.

At this time, the high-temperature, high-pressure refrigerant discharged from the compressor 100 does not flow to the outdoor heat exchanger 200 through the heating indoor heat exchanger 520 due to the reason that the first expansion valve 700 is closed. In addition, since the temperature control door 520 blocks the front of the heating indoor heat exchanger 520, a heat pickup phenomenon in which the ambient air temperature of the heating indoor heat exchanger 520 is increased does not occur.

Therefore, the ambient air cooled while passing through the indoor heat exchanger 510 for cooling can be introduced into the vehicle interior through the air conditioning duct 500 while maintaining the temperature of the cooling air.

<Heating mode>

As shown in FIG. 2, the first bypass valve 600 and the second expansion valve 710 are closed, and the second bypass valve 610 and the first expansion valve 700 are open. .

The temperature control door 521 is positioned such that air passing through the cooling indoor heat exchanger 510 passes through the heating indoor heat exchanger 520. In other words, the temperature control door 521 is in a state in which the bypass passage is closed.

When the compressor 100 operates in the above state, the high temperature and high pressure refrigerant compressed and discharged by the compressor 100 passes through the indoor heat exchanger 520 for heating and then passes through the first expansion valve 700 to the outdoor heat exchanger. After condensation while passing through 200, the second bypass valve 610 is introduced into the receiver 400 after passing through the internal heat exchanger 300. After passing through the receiver 400, only the refrigerant in the gaseous state is exchanged with the refrigerant introduced from the outdoor heat exchanger 200 in the internal heat exchanger 300, and then sucked back into the compressor 100.

At this time, the high temperature and high pressure refrigerant discharged from the compressor 100 passes through the air conditioning duct 500 while passing through the heating indoor heat exchanger 520 due to the reason why the first bypass valve 600 is closed. The air is heated, and the heated air is introduced into the vehicle through the air conditioning duct 500 while maintaining the temperature of the air.

<Dehumidification mode>

The dehumidification mode is performed when dehumidification is performed to remove moisture in the vehicle while maintaining the heating mode. As shown in FIG. 3, the first bypass valve 600 is closed and the first expansion valve ( 700 is open, the second bypass valve 610 is closed, the second expansion valve 710 is open, and the temperature control door 521 is a cooling indoor heat exchanger 510 The air passed through is positioned to pass through the heating indoor heat exchanger (520). In other words, the temperature control door 521 is in a state in which the bypass passage is closed.

When the compressor 100 operates in the above state, the high temperature and high pressure refrigerant compressed and discharged by the compressor 100 passes through the indoor heat exchanger 520 for heating and then passes through the first expansion valve 700 to the outdoor heat exchanger. After condensing while passing through the 200, it passes through the internal heat exchanger 300 and passes through the second expansion valve 710 to the indoor heat exchanger 510 for cooling.

The refrigerant introduced into the indoor heat exchanger 510 for cooling takes heat from the air while being exchanged with air passing through the air conditioning duct 500, and the evaporated refrigerant passes through the receiver 400. After passing through the receiver 400, only the refrigerant in the gaseous state is exchanged with the refrigerant introduced from the outdoor heat exchanger 200 in the internal heat exchanger 300, and then sucked back into the compressor 100.

At this time, the high temperature and high pressure refrigerant discharged from the compressor 100 passes through the air conditioning duct 500 while passing through the heating indoor heat exchanger 520 due to the reason why the first bypass valve 600 is closed. The heating is performed, the heating air is introduced into the vehicle interior through the air conditioning duct 500 in a warm state that maintains its own temperature is made the heating mode.

On the other hand, when the air blown through the air conditioning duct 500 is the air circulated in the vehicle interior, the air passing through the cooling indoor heat exchanger 510 is a heat exchange with the refrigerant flowing through the cooling heat exchanger (510) Is cooled by. Therefore, the water vapor contained in the air condenses and is removed from the surface of the cooling indoor heat exchanger 510 to realize the dehumidification mode.

Therefore, a heating mode for heating the room and a dehumidification mode for removing moisture in the room are simultaneously performed.

As described above, according to the heat pump type air conditioner according to the present invention, the present invention provides a compressor, an outdoor heat exchanger, an internal heat exchanger, a receiver, and a cooling indoor heat exchanger and a heating room respectively installed in an air conditioning duct. A heat pump type air conditioner having a heat exchanger and a refrigerant circulation circuit composed of at least one expansion valve, wherein the refrigerant at high temperature and high pressure discharged to the compressor in the cooling mode does not flow to the indoor indoor heat exchanger installed in the air conditioning duct. As a result, the cool air in the air conditioning duct cooled by the cooling indoor heat exchanger is discharged into the vehicle compartment while maintaining its own temperature, thereby preventing deterioration in cooling performance.

Claims (2)

A compressor 100 configured to compress and discharge the sucked refrigerant; An indoor heat exchanger 520 installed in the air conditioning duct 500 for heating the air while cooling the high temperature and high pressure refrigerant discharged from the compressor; A first expansion valve 700 which throttles the refrigerant discharged from the heating indoor heat exchanger 520, closes in the cooling mode, and opens in the heating mode; An outdoor heat exchanger (200) for cooling the refrigerant having a high temperature and high pressure discharged from the compressor or the refrigerant discharged from the first expansion valve (700); A receiver 400 which sends only the refrigerant in the gas phase to the compressor 100; An internal heat exchanger (300) for exchanging heat between the refrigerant discharged from the outdoor heat exchanger (200) and the refrigerant discharged from the receiver (400); It is disposed in the air conditioning duct 500 corresponding to the front side of the heating indoor heat exchanger 520, is discharged from the outdoor heat exchanger 200 side to evaporate the refrigerant via the internal heat exchanger (300) An indoor heat exchanger 510 for cooling connected to the receiver 400 to cool the surrounding air and to transfer the refrigerant; A second expansion valve 710 which throttles the refrigerant flowing into the cooling indoor heat exchanger 510, is opened in the cooling mode, and is closed during the heating operation; In the cooling mode, the refrigerant discharged from the compressor 100 changes direction to flow to the outdoor heat exchanger 200, and in the heating mode, the refrigerant discharged from the compressor 100 is heated to the indoor heat exchanger ( A first bypass valve 600 for diverting to flow to 520; In the cooling mode, the refrigerant flowing in the outdoor heat exchanger 200 and passing through the internal heat exchanger 300 is diverted to flow to the indoor heat exchanger 510 for cooling. The second bypass valve 610 to redirect the refrigerant flowing from the gas 200 and passed through the internal heat exchanger 300 flows to the receiver 400 without passing through the cooling indoor heat exchanger 510. Heat pump type air conditioner, characterized in that consisting of. The method of claim 1, In the dehumidification mode, the first bypass valve 600 is closed, the first expansion valve 700 is opened, the second bypass valve 610 is closed, and the second expansion valve 710 is open. Heat pump type air conditioner, characterized in that to control to.

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