KR20080009398A - Air conditioner type heat pump - Google Patents

Abstract

An air conditioner type heat pump is provided to increase a temperature of cooling water introduced into an engine directly after starting the engine, execute auxiliary heating when the temperature of the cooling water in a heater core does not reach a necessary temperature, and prevent reduction of blowoff force of cold air and hot air in cooling and heating modes. A compressor(100) compresses and discharges a sucked refrigerant. A heater core(650) is installed in an air conditioning duct(610) for passing through cooling water going by way of an engine. A heating indoor heat exchanger(200) is installed at an upper stream of the heater core and heats air while cooling a refrigerant of high temperature and high pressure discharged from the compressor. A temperature control door(651) passes air passing through the heating indoor heat exchanger through the heater core or makes a detour around the heater core. An outdoor heat exchanger(300) cools a refrigerant of high temperature and high pressure discharged from the compressor. A first direction change valve(400) converts a flow direction of the refrigerant discharged from the compressor into one of the heating indoor heat exchanger and the outdoor heat exchanger. A throttle element(500) throttles a refrigerant discharged from the heating indoor heat exchanger. A cooling indoor heat exchanger(600) is arranged at an upper stream of the heating indoor heat exchanger for evaporating a refrigerant. A bypass door(210) passes air passing through the cooling indoor heat exchanger through the heating indoor heat exchanger or makes a detour around the heating indoor heat exchanger. An accumulator(700) sends only gaseous refrigerant among refrigerant discharged from the cooling indoor heat exchanger to the compressor. A second direction change valve(800) converts a flow direction of the refrigerant discharged from the throttle element into one of the outdoor heat exchanger and the cooling indoor heat exchanger.

Description

Heat conditioner type air pump

1 is a view showing a configuration of a heat pump type air conditioner according to the present invention, which is a view showing an engine heating mode.

Figure 2 is a view showing the configuration of the heat pump type air conditioner according to the present invention, a view showing when the start-up heating mode.

Figure 3 is a view showing the configuration of the heat pump type air conditioner according to the present invention, a view showing when the heating mode in normal operation.

4 is a view showing a configuration of a heat pump type air conditioner according to the present invention, which is a view showing a cooling mode.

5 is a view showing a configuration of a heat pump type air conditioner according to the present invention, which is a view showing the dehumidification heating mode.

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

100: compressor

200: indoor heat exchanger for heating

210: bypass door

300: outdoor heat exchanger

400: first direction switching valve

500: throttling means

600: indoor heat exchanger for cooling

610: air conditioning duct

650: heater core

651: temperature control door

660: engine

700: Accumulator

800: second direction switching valve

900: internal heat exchanger

910: the first opening and closing valve

920: second on-off valve

The present invention relates to a heat pump type air conditioner, and more particularly, to improve the engine performance by raising the temperature of the coolant flowing into the engine immediately after the vehicle is started, and the temperature of the coolant in the heater core at the beginning of the start is required for heating. The present invention relates to a heat pump type air conditioner capable of auxiliary heating when the temperature is not reached, preventing cold and warm air volumes from decreasing in the heating and cooling mode, and improving the dehumidification performance in the cooling mode.

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 blown air on 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 the vehicle.

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, and mainly the cooling / heating mode can be switched. 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. The system is being actively researched recently.

As described above, the present invention improves engine performance by raising the temperature of the coolant flowing into the engine immediately after the vehicle starts, and assists heating when the coolant temperature in the heater core does not reach the temperature required for heating at the beginning of the start. The purpose of the present invention is to provide a heat pump type air conditioner capable of carrying out the cooling and heating modes in the cooling and heating mode, and to improve the dehumidification performance in the cooling mode.

Heat pump type air conditioner according to the present invention for achieving the above object comprises a compressor for compressing and discharging the sucked refrigerant; An indoor heat exchanger installed in an air conditioning duct and configured to heat air while cooling the refrigerant having a high temperature and high pressure discharged from the compressor; A heater core installed in the air conditioning duct on an air downstream side of the indoor heat exchanger for heating, through which cooling water passes through an engine; A temperature control door installed in the air conditioning duct to allow air passing through the indoor heat exchanger for heating to pass or bypass the heater core; An outdoor heat exchanger for cooling the refrigerant having a high temperature and high pressure discharged from the compressor; A first direction switching valve for switching a flow direction of the high temperature and high pressure refrigerant discharged from the compressor into one of the heating indoor heat exchanger and the outdoor heat exchanger; Throttling means for throttling the refrigerant discharged from the indoor heat exchanger for heating; A cooling indoor heat exchanger disposed in an air upstream of the indoor heat exchanger for heating in the air conditioning duct and evaporating a refrigerant; A bypass door installed in the air conditioning duct to allow air passing through the cooling indoor heat exchanger to pass or bypass the heating indoor heat exchanger; An accumulator for sending only the gaseous refrigerant from the refrigerant discharged from the indoor heat exchanger to the compressor; And a second direction switching valve for converting the flow direction of the refrigerant throttled out of the throttling means into one of the outdoor heat exchanger and 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.

1 is a view showing a configuration of a heat pump type air conditioner according to the present invention, which is a view showing an engine heating mode, and FIG. 2 is a view showing a configuration of a heat pump type air conditioner according to the present invention. Figure 3 is a view showing the mode, Figure 3 is a view showing the configuration of the heat pump type air conditioner according to the present invention, is a view showing the heating mode in normal operation, Figure 4 is a heat pump type air conditioner according to the present invention Fig. 5 is a view showing the configuration in the cooling mode, and Fig. 5 is a view showing the configuration of the heat pump type air conditioner according to the present invention and showing the dehumidification heating mode.

As illustrated, the heat pump type air conditioner according to the present invention includes a compressor 100 for compressing and discharging sucked refrigerant and a high temperature and high pressure refrigerant installed in the air conditioning duct 610 to be discharged from the compressor. Heater core for heating the indoor heat exchanger 200 for heating the air and installed in the air downstream of the heating indoor heat exchanger 200 in the air conditioning duct 610 to pass through the coolant passing through the engine 600 ( 650, and a temperature control door 651 installed in the air conditioning duct 610 to allow air passing through the heating indoor heat exchanger 200 to pass through or bypass the heater core 650. The outdoor heat exchanger 300 for cooling the high temperature and high pressure refrigerant discharged from the compressor, and the flow direction of the high temperature high pressure refrigerant discharged from the compressor, the indoor heat exchanger 200 and the outdoor heat exchanger 300 for heating. The first direction switching valve 400 to switch to any one of, the throttling means 500 for throttling the refrigerant discharged from the indoor heat exchanger 300 for heating, and the indoor heat exchanger for heating in the air conditioning duct 610 ( It is disposed upstream of the air 200, the cooling room heat exchanger 600 for evaporating the refrigerant, the air installed in the air conditioning duct 610 and the air passing through the cooling room heat exchanger 600 is the heating room The bypass door 210 to pass through or bypass the heat exchanger 200 and the accumulator to send only the gaseous refrigerant from the refrigerant discharged from the cooling indoor heat exchanger 600 to the compressor 100. 700 and a second direction switching valve 800 for switching the flow direction of the refrigerant throttling and discharged from the throttling means 500 to any one of the outdoor heat exchanger 300 and the cooling indoor heat exchanger 600. Po) Together.

In the above configuration, the accumulator 700 stores the refrigerant before being throttled by the throttling means 500 among the refrigerant discharged from one of the indoor heat exchanger 200 and the outdoor heat exchanger 300 for heating. It further comprises an internal heat exchanger 900 for heat exchange with the refrigerant discharged from each other.

In addition, the present invention is open only when the refrigerant flows into the outdoor heat exchanger 300 by the flow direction of the first direction switching valve 400 in the configuration as described above is discharged from the accumulator 700 The first on-off valve 910 to allow the refrigerant to flow into the internal heat exchanger 900 so as to exchange heat with the refrigerant, and the refrigerant flows into the outdoor heat exchanger 300 by changing the flow direction of the second direction switching valve 800. It further includes a second on-off valve 920 which is opened only when it is introduced and discharged so as to be combined with the refrigerant between the accumulator 700 and the cooling indoor heat exchanger 600.

Here, in the above-described configuration of the present invention, the first and second directional valves 400 and 8000 are generally used three-way valves, the throttling means 500 is used as the expansion valve, the refrigerant Carbon dioxide gas is used.

The operation of the present invention configured as described above will be described in order by dividing the engine heating mode, the starting initial heating mode, the heating mode at normal operation, the cooling mode, and the dehumidifying heating mode.

<Engine heating mode>

Here, the engine heating mode according to the present invention is a mode performed over about one minute after the vehicle is started. In order to implement this mode, the first on-off valve 910 is in a closed state, and the first directional valve 400 Is a state in which the flow direction is switched so that the refrigerant flows to the indoor heat exchanger 200 side for heating, and the second direction switching valve 800 is in a state in which the flow direction is switched so that the refrigerant flows to the outdoor heat exchanger 300 side, 2 on-off valve 920 is open.

As shown in FIG. 1, the high temperature and high pressure refrigerant discharged from the compressor 100 is transferred to the indoor heat exchanger 200 for heating installed in the air conditioning duct 610 by the flow direction changing action of the first direction switching valve 400. After the flow, it flows toward the internal heat exchanger 900.

Meanwhile, the refrigerant passing through the internal heat exchanger 900 is throttled while passing through the throttling means 500, and then flows into the second direction switching valve 800. Thereafter, the refrigerant introduced into the second direction switching valve 800 is introduced into the outdoor heat exchanger 300 by the flow direction change action, condensed, and then discharged and returned along the return pipe 310. Thus, the return pipe 310 The condensed refrigerant returned along the) flows into the open second on-off valve 920.

Next, the refrigerant flowing into the second on / off valve 920 passes through the accumulator 700 and only the refrigerant in the gas phase flows into the aforementioned internal heat exchanger 900.

Here, the internal heat exchanger 900 exchanges heat with the gaseous refrigerant introduced from the accumulator 700 and the high temperature refrigerant discharged from the heating heat exchanger 2000.

As described above, the refrigerant heat exchanged in the internal heat exchanger 900 is finally returned to the compressor 100.

Therefore, in the engine heating mode according to the present invention, the refrigerant discharged from the compressor 100 by the refrigerant flow direction change of the first and second directional control valves 400 and 800 is heated to the indoor heat exchanger 200 for heating. In order to pass through the internal heat exchanger 900, the throttling means 500, the outdoor heat exchanger 300, the second open / close valve 920, the accumulator 700, and the internal heat exchanger 900, the compressor ( It is performed repeatedly with the flow path back to 100).

Here, the internal heat exchanger (900) heats the suction refrigerant returning to the compressor (100) with a high temperature refrigerant heat discharged from the heating indoor heat exchanger (200) to increase the temperature of the refrigerant discharged from the compressor, and the liquid phase By preventing the refrigerant from flowing into the compressor to protect the winter compressor and improve the efficiency of the system of the present invention.

On the other hand, as shown in Figure 1 in the process of performing the engine heating mode as described above, the bypass door 210 is the air passing through the cooling indoor heat exchanger 600 is the indoor heat exchanger for heating ( It is operated to pass through the 200, the temperature control door 651 is operated so that the air passing through the heating indoor heat exchanger 200 passes through the heater core 650, thereby, by the blowing fan 620 The blown air passes through the cooling indoor heat exchanger 600, which is not operated in the evaporation action mode, and then exchanges heat with the cooling indoor heat exchanger 200 to obtain a high temperature.

Subsequently, the hot air passing through the heating indoor heat exchanger 200 passes through the heater core 650.

At this time, since the temperature of the cooling water circulating inside the heater core 650 is low at about 1 minute after the vehicle is started, the temperature of the cooling water is increased by the heat exchange with the hot air passing through the heater core 650. As a result, the high temperature coolant warms the engine via the engine, thereby improving the engine output performance.

So far, the engine heating mode of the present invention has been described.

Next, the starting initial heating mode of the present invention will be described.

<Start-up heating mode>

Here, in order to realize the initial heating mode according to the present invention, the first opening / closing valve 910 is in a closed state, and the first direction switching valve 400 has a flow direction such that the refrigerant flows to the indoor heat exchanger 200 for heating. In the switched state, the second direction switching valve 800 is a state in which the flow direction is switched so that the refrigerant flows to the outdoor heat exchanger 300 side, and the second on-off valve 920 is in an open state, and the aforementioned engine heating is performed. Same as the mode.

However, the engine heating mode is different from, as shown in FIG. 2, the bypass door 210 has air passing through the cooling indoor heat exchanger 600 to the indoor heat exchanger 200 for heating. Operated to pass through, the temperature control door 651 is the difference that the air passing through the heating indoor heat exchanger 200 is operated to bypass the heater core 650.

In the process of performing the initial heating mode as described above, the bypass door 210 is operated such that air passing through the cooling indoor heat exchanger 600 passes through the heating indoor heat exchanger 200, and the temperature control is performed. The door 651 is operated such that the air passing through the heating indoor heat exchanger 200 passes through the heater core 650, whereby the air blown by the blower fan 620 is not operated in the evaporation mode. After passing through the cooling indoor heat exchanger 600, and passes through the heating indoor heat exchanger 200 to bypass the heater core 650.

At this time, since the temperature of the coolant circulating inside the heater core 650 has not yet reached a temperature sufficient for heating at the beginning of the vehicle startup, the heater core 650 passes the high-temperature heat exchanged air while passing through the indoor heat exchanger 200 for heating. Do not pass through the bypass to be discharged into the room.

Therefore, the auxiliary heating is performed by controlling the cooling water passing through the heater core 650 to bypass the heater core 650 until the cooling water passes through the heater core 650 at the initial start of the vehicle until the proper temperature required for heating is reached.

So far, the starting initial heating mode according to the present invention has been described.

Hereinafter, the heating mode during normal operation according to the present invention will be described with reference to FIG. 3.

As described above, when the vehicle heating initial heating mode is performed for a predetermined time, since the coolant passing through the heater core 650 reaches a temperature necessary for heating sufficiently, the refrigerant is not flown by stopping the driving of the compressor 100. After controlling to prevent the bypass door 210, the air passing through the cooling indoor heat exchanger 600 is operated to bypass the heating indoor heat exchanger 200, and the temperature control door 651 is operated. Is controlled to operate so that the air passing through the heating indoor heat exchanger 200 passes through the heater core 650.

By doing so, the air blown by the blowing fan 620 passes through the cooling indoor heat exchanger 600, which is not operated in the evaporation action mode, and then passes through the heating indoor heat exchanger 200, and then, The heat is passed through the heater core 650 and the heat is exchanged with the high temperature coolant to increase the temperature to a high temperature, thereby allowing high temperature air to be sent to the room.

So far, the heating mode in normal operation according to the present invention has been described.

Hereinafter, the cooling mode of the present invention will be described with reference to FIG. 4.

Here, in order to implement the cooling mode according to the present invention, the second on-off valve 920 is in a closed state, and the first direction switching valve 400 is in a state in which the flow direction of the refrigerant is trapped in the outdoor heat exchanger 300 is switched. The second direction switching valve 800 is in a state in which the flow direction is switched so that the refrigerant flows toward the cooling indoor heat exchanger 600, and the first opening / closing valve 910 is in an open state.

As shown in FIG. 4, the high temperature and high pressure refrigerant discharged from the compressor 100 flows into the outdoor heat exchanger 300 installed outdoors by the flow direction change action of the first direction switching valve 400, and then opens. It flows to the internal heat exchanger 900 side via the first opening / closing valve 910. The refrigerant passing through the internal heat exchanger 900 is throttled while passing through the throttling means 500, and then flows into the second direction switching valve 800. Thereafter, the refrigerant introduced into the second direction switching valve 800 flows into the cooling indoor heat exchanger 600 and condenses by the flow direction changing action, and then passes through the receiver 700 so that only the refrigerant in the gas phase is described above. Flows into an internal heat exchanger 900.

Here, in the internal heat exchanger 900, the gaseous refrigerant introduced from the receiver 700 and the high temperature refrigerant discharged from the outdoor heat exchanger 300 are heat-exchanged with each other.

As described above, the refrigerant heat exchanged in the internal heat exchanger 900 is finally returned to the compressor 100.

That is, the refrigerant discharged from the compressor 100 by the refrigerant flow direction change of the first and second direction change valves 400 and 800 may be an outdoor heat exchanger 300, a first open / close valve 920, Flow path for returning to the compressor 100 by sequentially passing through the internal heat exchanger 900, the throttling means 500, the indoor heat exchanger 600 for cooling, the receiver 700, and the internal heat exchanger 900. It is performed repeatedly with.

On the other hand, as shown in Figure 4 in the process of performing the above-described cooling mode, the bypass door 210 is the air passing through the cooling indoor heat exchanger 600 is the indoor heat exchanger 200 for heating. The bypass is operated to pass, and the temperature control door 651 is operated so that the air passing through the heating indoor heat exchanger 200 bypasses the heater core 650.

In this way, the air blown by the blower fan 620 is heat-exchanged while passing through the cooling indoor heat exchanger 600 operated in the evaporation action mode to a low temperature of cold air to bypass the heating indoor heat exchanger 200. After passing, the filter passes through the heater core 650 and is discharged into the room.

Here, the air that is heat-exchanged while passing through the cooling indoor heat exchanger 600 and whose temperature is reduced to the cold air state can be discharged to the room by the bypass door 210 in a state where the air volume thereof is not reduced.

The cooling mode according to the present invention has been described so far.

Hereinafter, the dehumidification heating mode according to the present invention will be described.

Here, in order to implement the dehumidifying heating mode according to the present invention, the second on-off valve 920 is in a closed state, and the first direction switching valve 400 has a flow direction in which the refrigerant flows to the outdoor heat exchanger 300 side. In this state, the second direction switching valve 800 is in a state in which the flow direction is switched so that the refrigerant flows to the cooling indoor heat exchanger 600 side, and the first opening / closing valve 910 is in an open state.

As shown in FIG. 5, the high temperature and high pressure refrigerant discharged from the compressor 100 flows into the outdoor heat exchanger 300 installed outdoors by the flow direction change action of the first direction switching valve 400, and then opens. It flows to the internal heat exchanger 900 side via the first opening / closing valve 910. The refrigerant passing through the internal heat exchanger 900 is throttled while passing through the throttling means 500, and then flows into the second direction switching valve 800. Thereafter, the refrigerant introduced into the second direction switching valve 800 flows into the cooling indoor heat exchanger 600 and condenses by the flow direction changing action, and then passes through the receiver 700 so that only the refrigerant in the gas phase is described above. Flows into an internal heat exchanger 900.

Here, in the internal heat exchanger 900, the gaseous refrigerant introduced from the receiver 700 and the high temperature refrigerant discharged from the outdoor heat exchanger 300 are heat-exchanged with each other.

As described above, the refrigerant heat exchanged in the internal heat exchanger 900 is finally returned to the compressor 100.

That is, the refrigerant discharged from the compressor 100 by the refrigerant flow direction change of the first and second direction change valves 400 and 800 may be an outdoor heat exchanger 300, a first open / close valve 920, Flow path for returning to the compressor 100 by sequentially passing through the internal heat exchanger 900, the throttling means 500, the indoor heat exchanger 600 for cooling, the receiver 700, and the internal heat exchanger 900. It is performed repeatedly with.

In addition, the bypass door 210 is operated such that air passing through the cooling indoor heat exchanger 600 bypasses the heating indoor heat exchanger 200, and the temperature control door 651 is used for the heating. The air passing through the indoor heat exchanger 200 is controlled to be operated to pass through the heater core 650.

That is, when frost is generated in the vehicle windshield during the above-described cooling mode, the temperature control door 651 is operated to allow air passing through the indoor cooling heat exchanger 600 to pass through the heater core 650. , The condensed water generated by the indoor heat exchanger 600 for cooling is evaporated while passing through the heater core 650, thereby removing moisture, thereby preventing frost on the vehicle windshield.

As described above, according to the present invention, the engine performance is improved by increasing the temperature of the coolant flowing into the engine immediately after starting the vehicle, and when the coolant temperature in the heater core does not reach the temperature required for heating at the beginning of the start-up. Auxiliary heating can be carried out, the cooling and warm air volume in the cooling and heating mode is not reduced, and the dehumidification performance can be improved in the cooling mode.

Claims (3)

A compressor 100 configured to compress and discharge the sucked refrigerant; A heater core (650) installed in the air conditioning duct (610), through which cooling water passes through the engine (600); An indoor heat exchanger (200) installed in the air conditioning duct (610) upstream of the air of the heater core (650) for heating the air while cooling the refrigerant having a high temperature and high pressure discharged from the compressor; A temperature control door 651 installed in the air conditioning duct 610 to allow air passing through the heating indoor heat exchanger 200 to pass through or bypass the heater core 650; An outdoor heat exchanger (300) for cooling the high temperature and high pressure refrigerant discharged from the compressor; A first direction switching valve 400 for converting the refrigerant flow direction of the high temperature and high pressure discharged from the compressor into one of the heating indoor heat exchanger 200 and the outdoor heat exchanger 300; Throttling means (500) for throttling the refrigerant discharged from the indoor heat exchanger (300) for heating; A cooling indoor heat exchanger (600) disposed in an air upstream of the heating indoor heat exchanger (200) in the air conditioning duct (610) and evaporating a refrigerant; A bypass door 210 installed in the air conditioning duct 610 to allow air passing through the cooling indoor heat exchanger 600 to pass through or bypass the heating indoor heat exchanger 200; An accumulator (700) for sending only the refrigerant of the gaseous phase to the compressor (100) among the refrigerant discharged from the cooling indoor heat exchanger (600); It includes a second direction switching valve 800 for switching the flow direction of the refrigerant throttling in the throttling means 500 to any one of the outdoor heat exchanger 300 and the cooling indoor heat exchanger 600. Heat pump type air conditioner characterized in that. The method of claim 1, Internal heat exchanged between the refrigerant discharged from the accumulator 700 and the refrigerant before being throttled by the throttling means among the refrigerant discharged from any one of the indoor heat exchanger 200 and the outdoor heat exchanger 300 for heating. Heat pump type air conditioner further comprises an exchanger (900). The method of claim 2, The internal heat exchanger is opened only when refrigerant flows into the outdoor heat exchanger 300 and is discharged by the flow direction change of the first direction switching valve 400 to exchange heat with the refrigerant discharged from the accumulator 700. A first opening / closing valve 910 to be introduced into the 900; The refrigerant is opened only when the refrigerant flows into the outdoor heat exchanger 300 and is discharged by the change of the flow direction of the second diverter valve 800, and thus the refrigerant between the accumulator 700 and the cooling indoor heat exchanger 600. And a second on / off valve (920) to be joined with the heat pump type air conditioner.

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