KR20160009779A - Automotive air conditioning system - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cooling / heating system for a vehicle which keeps a room temperature of a vehicle at a predetermined temperature by heating or cooling air provided to the interior of the vehicle. More particularly, In the case of heating, since waste heat is used in the automobile, no red light is generated, and two directional control valves for switching the flow of the refrigerant are provided to prevent cooling performance and deterioration of efficiency. An indoor heat exchanger as a heat exchanger for heating and an auxiliary heater as an auxiliary heat source to provide a cooling and heating system for a vehicle which can smoothly perform a dehumidifying function for securing a front clock in a car.

Description

TECHNICAL FIELD [0001] The present invention relates to an automotive air conditioning system,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a vehicular heating and cooling system for heating or cooling air provided to an interior of a vehicle to maintain the indoor temperature of the vehicle at a predetermined temperature, and more particularly, And a flow path switching valve for switching the flow of the refrigerant. In order to enable the dehumidifying function to be used smoothly in the automobile, the indoor air conditioning unit located in the room is provided with a heat exchanger And an auxiliary heater for the vehicle.

Background Art [0002] A vehicle air conditioning system generally includes a cooling system for cooling an interior of a vehicle and a heating system for heating the interior of the vehicle.

In the cooling system described above, the air passing through the outside of the evaporator at the evaporator side of the refrigerant cycle is exchanged with the refrigerant flowing in the evaporator to cool the inside of the vehicle, and the heating system is provided at the heater core side of the cooling water cycle The air passing through the outside of the core is exchanged with the cooling water flowing in the inside of the heater core to warm the inside of the vehicle.

In addition, a heat pump system capable of selectively performing cooling and heating by switching the flow direction of the refrigerant by using one refrigerant cycle is employed in a different structure from the vehicle heating and cooling system. For example, two heat exchangers (That is, an indoor heat exchanger installed inside the air conditioner case for exchanging heat with air blown into the vehicle interior, and an outdoor heat exchanger for exchanging heat outside the air conditioner case), at least one directional control device Valve.

Therefore, when the cooling mode is operated according to the flow direction of the refrigerant by the direction control valve, the indoor heat exchanger functions as a cooling heat exchanger. When the heating mode is activated, the indoor heat exchanger functions as a heating heat exchanger .

Various types of such air-conditioning and heating systems for vehicles have been proposed, for example, those disclosed in a representative registered patent No. 10-1339226 (Mar. 13, 2013).

A cooling system for an automotive heat pump system, comprising: a cooling unit configured to supply and circulate cooling water to electrical equipment through a cooling line; and an air conditioning unit connected to a refrigerant line to control cooling and heating of the vehicle interior, A radiator for circulating cooling water along a cooling line through a water pump and cooling the supplied cooling water through heat exchange with outside air; and a cooling fan for blowing wind to the radiator, Further comprising a heat exchanger for circulating the cooling water and changing the water temperature of the cooling water by selectively using a waste heat source generated from the electric component according to each mode and for exchanging heat with the cooling water connected to the refrigerant line of the air conditioning means, , The air conditioning means is adapted to control the heating, cooling and dehumidifying modes The one outside air is provided in the opening and closing door for selectively controlled, such that the inlet into the condenser and a PCT heater passes through the HVAC module; A compressor connected to the evaporator through a refrigerant line and compressing refrigerant in a gaseous state; An accumulator disposed on the refrigerant line between the compressor and the evaporator, the accumulator supplying only the gas refrigerant to the compressor; An external condenser provided in the engine room of the vehicle and connected through a refrigerant line for condensing the refrigerant; A first valve for selectively supplying the refrigerant discharged from the compressor to the internal condenser or the external condenser depending on the mode of the vehicle; A first expansion valve for receiving and expanding the refrigerant passing through the internal condenser; A second valve for selectively supplying the refrigerant expanded through the first expansion valve to the external condenser or the heat exchanger; A third valve for selectively supplying the refrigerant having passed through the external condenser or the heat exchanger to the evaporator or the accumulator; And a second expansion valve provided between the evaporator and the third valve for expanding the refrigerant flowing through the opening and closing of the third valve.

In order to overcome the deterioration in performance and efficiency during cooling, the conventional technology described above further includes a valve for switching the flow path of the refrigerant. The refrigerant branched from the valve is further divided into the air-heat exchanger and the water- However, the system is not succesful in designing the piping and the pressure loss at the low pressure side is low, so that the heating performance is low.

Therefore, according to the present invention, there is provided a chiller in which cooling water and a refrigerant heat-exchange with each other. In the heating, since waste heat is used in the automobile, no red light is generated and two directional control valves for switching the flow of the refrigerant are provided. And the vehicle air conditioning unit is provided with an indoor heat exchanger as a heat exchanger for heating in addition to the evaporator and an auxiliary heater serving as an auxiliary heat source and can be used for a vehicle which can smoothly perform a dehumidifying function And it is an object of the present invention to provide an air conditioning and heating system.

The cooling / heating system for a vehicle according to the present invention comprises a heat exchanger for introducing a refrigerant and exchanging heat with outside air, a compressor for introducing and compressing the refrigerant to discharge the compressed refrigerant, and a refrigerant installed in the vehicle air conditioning unit, An indoor heat exchanger for exchanging heat with air supplied to the inside of the vehicle, an electronic expansion valve for introducing the refrigerant discharged from the indoor heat exchanger and expanding the refrigerant, a cooling water circulating through the vehicle driving portion, A temperature responsive expansion valve for introducing the refrigerant of any one of the heat exchanger and the chiller to expand the refrigerant in accordance with the temperature of the refrigerant at the outlet of the evaporator provided in the vehicle air conditioning unit, Evaporator is used to temporarily store the refrigerant, An accumulator for separating the refrigerant into liquid and liquid and supplying the gaseous refrigerant to the compressor and a branch line through which refrigerant discharged from the indoor heat exchanger flows to selectively supply the refrigerant to one of the heat exchanger and the electronic expansion valve, And a first flow path switching valve for switching the first flow path switching valve.

At this time, the vehicle air conditioning unit according to the present invention includes an opening / closing door that sucks air into the interior through the inlet and selectively rotates the air sucked into the inside, and the first outlet and the second outlet, An indoor heat exchanger provided at a first outlet side of the air conditioner case for exchanging heat between air supplied to the interior of the vehicle through the first outlet and refrigerant drawn through the compressor, A heater sensor disposed behind the auxiliary heater and measuring a temperature of air supplied to a vehicle interior of the vehicle, and a heater sensor disposed at the rear of the auxiliary heater for selectively heating the air supplied to the interior of the vehicle, And an evaporator for exchanging heat between the air sucked into the air conditioning case and the refrigerant introduced through the temperature responsive expansion valve, It may include EVA sensor for measuring the temperature of the air passing through the evaporator.

In the vehicle cooling / heating system according to the present invention, the refrigerant discharged from the heat exchanger and the chiller is provided on a branch line through which the refrigerant flows, and selectively flows into the accumulator and the temperature responsive expansion valve Further comprising a two-flow switching valve or a check valve for allowing the refrigerant to flow only from the evaporator to the accumulator side.

And an internal heat exchanger (IHX) for exchanging heat between the refrigerant in the hot liquid phase through the heat exchanger according to the present invention and the refrigerant in the low temperature phase passing through the evaporator.

The vehicle cooling / heating system according to the present invention has the following effects.

First, since the cooling water and the refrigerant are provided with the chiller that exchanges heat with each other, the cooling heat is used at the time of heating, so there is no red light.

Second, there are two directional control valves for switching the flow of the refrigerant, and prevent deterioration of the cooling performance and efficiency. In addition to the evaporator, the indoor heat exchanger, which is a heat exchanger for heating, And has a heater, so that the dehumidifying function can be smoothly performed in order to secure the front watch in the automobile.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view illustrating a flow of a refrigerant in a heating mode of a vehicle cooling / heating system including a first flow path switching valve and a second flow path switching valve according to the present invention. FIG.
FIG. 2 is a view illustrating a flow of a refrigerant in a cooling mode of a cooling / heating system for a vehicle including a first flow path switching valve and a second flow path switching valve according to the present invention.
3 is a diagram illustrating a flow of a refrigerant in a dehumidification cooling mode of a vehicle cooling / heating system including a first flow path switching valve and a second flow path switching valve according to the present invention.
FIG. 4 is a view illustrating a flow of a refrigerant in the dehumidifying and heating mode of a vehicle cooling / heating system including a first flow path switching valve and a second flow path switching valve according to the present invention.
5 is a view illustrating a flow of a refrigerant in a heating mode of a heating / cooling system for a vehicle including a first flow path switching valve and a check valve according to the present invention.
6 is a view illustrating a flow of a refrigerant in a cooling mode of a cooling / heating system for a vehicle including a first flow path switching valve and a check valve according to the present invention.
FIG. 7 is an exemplary view showing a flow of a refrigerant in a dehumidification cooling mode of a vehicle cooling / heating system including a first flow path switching valve and a check valve according to the present invention.
8 is a view illustrating a flow of a refrigerant in the dehumidifying heating mode of a vehicle cooling / heating system including a first flow path switching valve and a check valve according to the present invention.
FIG. 9 is a view illustrating the construction of a heating / cooling system for a vehicle including a first flow path switching valve, a check valve, and an internal heat exchanger according to the present invention.
10 is a diagram illustrating another configuration of a vehicle air conditioning system including a first flow path switching valve, a check valve, and an internal heat exchanger according to the present invention.
FIG. 11 is an exemplary view showing a configuration of a vehicle cooling / heating system including a two-way valve, a check valve, and an internal heat exchanger according to another exemplary embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, at the time of the present application, It should be understood that variations can be made.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating / cooling system for a vehicle that heats or cools air provided to a room of a vehicle to maintain a room temperature of the vehicle at a predetermined temperature.

1 to 11, a vehicle cooling / heating system according to the present invention includes a radiator 110, a heat exchanger 120, a compressor 130, a vehicle air conditioning unit 200, an indoor heat exchanger 220, A chiller 150, a temperature-responsive expansion valve 160, and an accumulator 170.

First, the radiator 110 draws cooling water for cooling the driving system of the vehicle and exchanges heat with the outside air.

At this time, the radiator circulates the cooling water by the water pump provided in the driving system of the vehicle as usual, and heat exchange is performed by wind blown to the cooling fan 111 provided on one side.

The heat exchanger 120 is disposed in close proximity to the radiator 110, exchanges heat with the outside air through the refrigerant circulation line through which the refrigerant flows, and discharges the refrigerant on the refrigerant circulation line.

At this time, the heat exchanger 120 also preferably performs heat exchange (air cooling) on the refrigerant by the wind blown to the cooling fan 111 like the radiator 110.

Further, the compressor 130 draws refrigerant through a refrigerant circulation line with a compressor, compresses the refrigerant, and discharges the compressed refrigerant through the refrigerant circulation line. At this time, the refrigerant is compressed and discharged at a high temperature and a high pressure.

The indoor heat exchanger 220 exchanges heat with the air supplied to the interior of the vehicle using the refrigerant discharged through the refrigerant circulation line in the compressor 120, thereby heating the interior of the vehicle.

The vehicle air conditioning unit (200) includes an air conditioning case (210).

An air inlet 211 is formed at one side of the air conditioning case 210 to draw air into the air inlet through the inlet and an outlet through which air drawn into the air outlet is formed at the other side.

At this time, an opening / closing door 212 which selectively rotates with the partition wall is formed on the front side of the outlet by a first outlet 213 and a second outlet 214.

Accordingly, the opening / closing door 212 selectively rotates to close any one of the first outlet 213 and the second outlet 214, thereby discharging air to only one selectively opened outlet, The air is distributed to the first outlet 213 and the second outlet 214 at a specified rate of air and discharged.

An indoor heat exchanger 220 is connected to the first outlet 213 of the air conditioner case 210. The indoor heat exchanger 220 is connected to the compressor 130 through a refrigerant circulation line, The indoor heat exchanger 213 exchanges heat between the air supplied to the inside of the vehicle and the refrigerant introduced through the compressor 130, thereby heating the air supplied to the inside of the vehicle, thereby heating the interior of the vehicle.

An auxiliary heater 230 is disposed behind the indoor heat exchanger 220 so that the heated air is selectively heated through the indoor heat exchanger 220 to heat the interior of the vehicle.

The driving of the auxiliary heater 230 is controlled by a heater sensor 231 arranged behind the auxiliary heater 230. The heater sensor 231 is connected to the first outlet 213 of the air conditioning case 210 To measure the temperature of the air supplied to the interior of the vehicle, thereby controlling the driving of the auxiliary heater 230. [

An evaporator 240 is provided at an inlet side of the air conditioning case 200 and a refrigerant introduced through the temperature responsive expansion valve 160 connected to the air sucked into the air conditioning case 200 and the refrigerant circulation line Exchanges heat to cool the air supplied to the inside of the vehicle, thereby cooling the inside of the vehicle.

At this time, the temperature of the air passing through the evaporator 240 is measured by the Eva sensor 241, and the driving of the compressor 130 is controlled.

Next, the electronic expansion valve (140) draws refrigerant discharged from the indoor heat exchanger (220) and expands the refrigerant.

At this time, the refrigerant expanded in the electronic expansion valve 140 is converted to a low pressure.

The refrigerant flowing through the electronic expansion valve 130 is supplied to the chiller 150 to exchange heat between the cooling water circulating the driving system 100 of the vehicle and the refrigerant drawn through the electronic expansion valve 130.

At this time, the chiller 150 receives the waste heat supplied from the cooling water of the vehicle to perform heating, so that more energy can be obtained than the amount of waste heat that can be obtained from the air.

The temperature responsive expansion valve 160 draws one of the refrigerant of the heat exchanger 120 and the chiller 150 to cool the refrigerant according to the temperature of the air supplied from the vehicle air conditioning unit 200 to the inside of the vehicle. Expands.

The accumulator 170 temporarily stores the refrigerant of the chiller 150 and the evaporator 240, separates the refrigerant into a gas and a liquid, supplies the gaseous refrigerant to the compressor 130, do.

The heating and cooling system for a vehicle according to the present invention includes a chiller 150 for using waste heat of the vehicle so that there is no red flag at the time of heating and has a heat exchanger 120 for preventing cooling performance and deterioration of efficiency, And a first flow path switching valve 180 and a second flow path switching valve 190 capable of switching the flow path of the refrigerant for switching.

The refrigerant discharged from the indoor heat exchanger 220 flows into the first flow path switching valve 180 and the refrigerant discharged from the first flow path switching valve 180 flows into the first flow path switching valve 180, The valve 180 is provided on the branch line of the refrigerant circulation line through which the refrigerant flows through the three-way valve or the two-way valve, and selectively flows the refrigerant to any one of the heat exchanger 120 and the electronic expansion valve 130 The flow path is switched or the flow path is selectively opened and closed.

At this time, it is preferable that the selection requirement of the first flow path switching valve 180 is determined by any one of the cooling mode and the heating mode. In the cooling mode, the refrigerant discharged from the indoor heat exchanger 220 is supplied to the heat exchanger 120). In the heating mode, the refrigerant flow is switched so that the refrigerant discharged from the indoor heat exchanger (220) flows only toward the chiller (150).

The second flow path switching valve 190 is also provided on a branch line of the refrigerant circulation line through which the refrigerant discharged from the heat exchanger 120 and the chiller 150 flows as a three-way valve, (170) and the temperature responsive expansion valve (160).

In this case, it is preferable that the second flow-line switching valve 190 is also determined by a mode selected from a cooling mode or a heating mode. In the cooling mode, the refrigerant discharged from the heat exchanger 120 is subjected to temperature- The refrigerant flow is switched so that the refrigerant discharged from the chiller 150 flows only toward the accumulator 170 in the heating mode.

The vehicle cooling and heating system according to the present invention may include a check valve 191 for allowing refrigerant to flow from the evaporator 240 to the accumulator 170 only in place of the second flow path switching valve 190 have.

The chiller 150 is connected directly to the refrigerant circulation line with the accumulator 170. The evaporator 160 is connected to the refrigerant circulation line through the temperature responsive expansion valve 160, 240 are connected to a refrigerant circulation line connecting the chiller 150 and the accumulator 170 so that the refrigerant is discharged to the accumulator 170.

The check valve 191 is provided such that the refrigerant on the refrigerant circulating line passing from the evaporator 240 to the accumulator 170 flows only from the evaporator 240 to the accumulator 170.

The high pressure liquid refrigerant flowing from the heat exchanger 120 to the temperature responsive expansion valve 160 and the low pressure refrigerant flowing from the evaporator 240 to the accumulator 170 heat- And may further include an internal heat exchanger 192.

Hereinafter, an embodiment of the vehicle cooling / heating system according to the present invention will be described.

Referring to FIG. 1, the flow of the refrigerant in the heating mode of the vehicular heating / cooling system including the first flow path switching valve 180 and the second flow path switching valve 190 will be described.

First, the compressor 130 compresses refrigerant at a high temperature and a high pressure, and discharges the compressed refrigerant to the indoor heat exchanger 220 of the vehicle air conditioning unit 200 connected to the refrigerant circulation line.

The indoor heat exchanger (220) exchanges the introduced refrigerant with the air drawn in through the inlet of the vehicle air conditioning unit (200).

At this time, the opening / closing door 212 is rotated to open the first outlet 213, and the second outlet 214 is closed, and the air exchanged with the refrigerant is heated, And then discharged into the room to be heated.

The refrigerant heat-exchanged with air in the indoor heat exchanger 220 of the vehicle air conditioning unit 200 is introduced into the electronic expansion valve 140 connected to the indoor heat exchanger 220 through a refrigerant circulation line.

At this time, the refrigerant circulation line is configured as a branch line so that the refrigerant discharged from the indoor heat exchanger 220 is drawn into the heat exchanger 120 or the electronic expansion valve 140, and the first flow path switching valve 180 In the heating mode, the first flow path switching valve 180 allows the flow path of the refrigerant to flow only to the electronic expansion valve 140.

That is, the first flow path switching valve 180 is connected to the indoor heat exchanger 220, the heat exchanger 120, and the electronic expansion valve 140 on the branch line of the refrigerant circulation line by a three-way valve , And only the designated flow path is opened according to the cooling mode or the heating mode selection to change or open the flow direction of the flow path.

The refrigerant introduced into the electronic expansion valve 140 is expanded and converted from a high pressure to a low pressure, and the refrigerant converted into a low pressure is discharged into the chiller 150 along the refrigerant circulation line.

The refrigerant introduced into the chiller 150 is introduced into the accumulator 170 connected to the refrigerant circulation line and the chiller 150 after heat exchange with the cooling water circulating in the driving system 110 of the vehicle.

The refrigerant circulation line is configured as a branch line so that the refrigerant discharged from the chiller 150 is drawn into the temperature responsive expansion valve 160 or the accumulator 170 and the second flow path switching valve 190 is disposed on the branch line. In the heating mode, the second flow path switching valve 190 allows the flow path of the refrigerant to flow only to the accumulator 170.

The refrigerant separated from the accumulator (170) into gas and liquid circulates gas refrigerant to be supplied to the compressor (130) again.

By performing the above-described construction, the refrigerant performs the heating by receiving the waste heat supplied from the cooling water through the chiller, so that more energy is obtained than the amount of waste heat that can be obtained from the air, , Since the vehicle continuously discharges the waste heat during the driving process, continuous heating can be performed.

Referring to FIG. 2, the flow of refrigerant in the cooling mode of the vehicle cooling / heating system including the first and second flow switching valves 180 and 190 will be described.

First, the compressor 130 compresses refrigerant at a high temperature and a high pressure, and discharges the compressed refrigerant to the indoor heat exchanger 220 of the vehicle air conditioning unit 200 connected to the refrigerant circulation line.

The refrigerant through the indoor heat exchanger 220 of the vehicle air conditioning unit 200 is introduced into the heat exchanger 120 connected to the indoor heat exchanger 220 through a refrigerant circulation line.

At this time, the refrigerant circulation line is configured as a branch line so that the refrigerant discharged from the indoor heat exchanger 220 is drawn into the heat exchanger 120 or the electronic expansion valve 140, and the first flow path switching valve 180 In the cooling mode, the first flow path switching valve 180 allows the flow path through which the refrigerant flows to flow only to the heat exchanger 120.

In other words, the first flow path switching valve 180 is connected to the indoor heat exchanger 220, the heat exchanger 120, and the electronic expansion valve 140 as a refrigerant circulation line with a three-way valve, According to the heating mode selection, only the designated flow path is opened to change the direction of the flow path.

The refrigerant introduced into the heat exchanger 120 is heat-exchanged with external air such as the radiator, and the heat-exchanged refrigerant is discharged to the temperature responsive expansion valve 160 along the refrigerant circulation line.

The refrigerant introduced into the temperature responsive expansion valve 160 is expanded by the temperature responsive expansion valve 160 and then supplied to the vehicle air conditioning unit 200 connected to the temperature responsive expansion valve 160 via a refrigerant circulation line The evaporator 240 of FIG.

At this time, the refrigerant circulation line is configured as a branch line so that the refrigerant discharged from the heat exchanger 120 is drawn into the temperature responsive expansion valve 160 or the accumulator 170, and the second flow path switching valve 190 In the cooling mode, the second flow path switching valve 190 allows the flow path through which the refrigerant flows to flow only to the temperature responsive expansion valve 160.

The refrigerant expanded in the temperature responsive expansion valve 160 and having a low pressure and low temperature undergoes heat exchange with the air introduced through the inlet of the vehicle air conditioning unit 200 through the evaporator 240 connected to the refrigerant circulation line.

At this time, the opening / closing door 212 of the vehicle air conditioning unit 200 is rotated so that the second outlet 214 is opened, the first outlet 213 is closed, the air exchanged with the refrigerant is cooled, (214), and is cooled.

The refrigerant heat exchanged with air in the evaporator 240 of the vehicle air conditioning unit 200 is led back to the temperature responsive expansion valve 160 connected to the evaporator 240 through a refrigerant circulation line, And is introduced into the accumulator 170 connected to the refrigerant circulation line and the temperature responsive expansion valve 160.

The refrigerant separated from the accumulator (170) into gas and liquid circulates gas refrigerant to be supplied to the compressor (130) again.

The cooling performance and the reduction rate of the efficiency are optimized by the implementation according to the above-described configuration, and the flow of the refrigerant passes through the accumulator even during the cooling, so that the oil shortage can be prevented.

Referring to FIG. 3, the flow of the refrigerant in the dehumidification cooling mode of the vehicular heating / cooling system including the first flow path switching valve 180 and the second flow path switching valve 190 will be described.

The refrigerant flow in the dehumidification cooling mode is the same as that in the cooling mode except that the opening and closing amount of the opening and closing door 212 in the vehicle air conditioning unit 200 is adjusted to dehumidify the air discharged into the vehicle interior and then reheat.

In other words, since the air flow inside the vehicle air conditioning unit 200 becomes the indoor heat exchanger 220 in the evaporator 240, the dehumidified and cooled air in the evaporator 240 is supplied to the indoor heat exchanger 220 Reheated and supplied to the room.

The energy balance in a cooling system is "evaporator (evaporator) heat absorption + compressor output = condenser (heat exchanger) heat radiation".

Therefore, by the implementation according to the above-described construction, the indoor heat exchanger inside the vehicle air conditioning unit radiates heat in an amount required for reheating, and the remaining heat amount controls the flow of the refrigerant so as to radiate heat in the outdoor heat exchanger, .

Referring to FIG. 4, the flow of the refrigerant in the dehumidifying and heating mode of the vehicle cooling / heating system including the first and second flow switching valves 180 and 190 will be described.

The refrigerant flows from the compressor 130 to the indoor heat exchanger 220 of the vehicle air conditioning unit 200 and from the indoor heat exchanger 220 to the first flow path switching valve 180, The switching valve 180 to the electronic expansion valve 140, the electronic expansion valve 140 to the chiller 150, the chiller 150 to the second flow path switching valve 190, Sensitive evaporative expansion valve 160 to the evaporator 240 of the vehicle air conditioning unit 200 from the evaporator 210 to the temperature responsive expansion valve 160 in the evaporator 240, The refrigerant is circulated in the order from the temperature responsive expansion valve 160 to the accumulator 170 and from the accumulator 170 to the compressor 130 in this order.

The detailed description and the connection relation of each component have been described above and will be omitted here.

The amount of opening and closing of the opening and closing door in the vehicle air conditioning unit is adjusted by the implementation according to the above-described configuration to dehumidify and reheat.

According to the above-mentioned " energy balance in the air conditioning system ", the evaporation heat amount is supplied by the amount required for "dehumidification + cooling" in the evaporator, and the remaining heat amount is controlled by the chiller located outside the vehicle air conditioning unit .

Referring to FIG. 5, the flow of the refrigerant in the heating mode of the vehicle cooling / heating system including the first flow path switching valve 180 and the check valve 191 will be described.

First, the compressor 130 compresses refrigerant at a high temperature and a high pressure, and discharges the compressed refrigerant to the indoor heat exchanger 220 of the vehicle air conditioning unit 200 connected to the refrigerant circulation line.

The indoor heat exchanger (220) exchanges the introduced refrigerant with the air drawn in through the inlet of the vehicle air conditioning unit (200).

At this time, the opening / closing door 212 is rotated to open the first outlet 213, and the second outlet 214 is closed, and the air exchanged with the refrigerant is heated, And then discharged into the room to be heated.

The refrigerant heat-exchanged with air in the indoor heat exchanger 220 of the vehicle air conditioning unit 200 is introduced into the electronic expansion valve 140 connected to the indoor heat exchanger 220 through a refrigerant circulation line.

At this time, the refrigerant circulation line is configured as a branch line so that the refrigerant discharged from the indoor heat exchanger 220 is drawn into the heat exchanger 120 or the electronic expansion valve 140, and the first flow path switching valve 180 In the heating mode, the first flow path switching valve 180 allows the flow path of the refrigerant to flow only to the electronic expansion valve 140.

In other words, the first flow path switching valve 180 is connected to the indoor heat exchanger 220, the heat exchanger 120, and the electronic expansion valve 140 as a refrigerant circulation line with a three-way valve, According to the heating mode selection, only the designated flow path is opened to change the direction of the flow path.

The refrigerant introduced into the electronic expansion valve 140 is expanded and converted from a high pressure to a low pressure, and the refrigerant converted into a low pressure is discharged into the chiller 150 along the refrigerant circulation line.

The refrigerant introduced into the chiller 150 is introduced into the accumulator 170 connected to the chiller 150 through a refrigerant circulation line after heat exchange with the cooling water circulating in the driving system 110 of the vehicle.

In this case, the refrigerant discharged from the chiller 150 may flow to the temperature responsive expansion valve 160, but a check valve 191 is provided on the refrigerant circulation line connected to the temperature responsive expansion valve 160, The flow path is blocked by the check valve 191, and flows from the chiller 150 to the accumulator 170.

The refrigerant separated from the accumulator (170) into gas and liquid circulates gas refrigerant to be supplied to the compressor (130) again.

Referring to FIG. 6, the flow of the refrigerant in the cooling mode of the vehicular cooling / heating system including the first flow path switching valve 180 and the check valve 191 will be described.

First, the compressor 130 compresses refrigerant at a high temperature and a high pressure, and discharges the compressed refrigerant to the indoor heat exchanger 220 of the vehicle air conditioning unit 200 connected to the refrigerant circulation line.

The refrigerant through the indoor heat exchanger 220 of the vehicle air conditioning unit 200 is introduced into the heat exchanger 120 connected to the indoor heat exchanger 220 through a refrigerant circulation line.

At this time, the refrigerant circulation line is configured as a branch line so that the refrigerant discharged from the indoor heat exchanger 220 is drawn into the heat exchanger 120 or the electronic expansion valve 140, and the first flow path switching valve 180 In the cooling mode, the first flow path switching valve 180 allows the flow path through which the refrigerant flows to flow only to the heat exchanger 120.

In other words, the first flow path switching valve 180 is connected to the indoor heat exchanger 220, the heat exchanger 120, and the electronic expansion valve 140 as a refrigerant circulation line with a three-way valve, According to the heating mode selection, only the designated flow path is opened to change the direction of the flow path.

The refrigerant introduced into the heat exchanger 120 is heat-exchanged with external air such as the radiator, and the heat-exchanged refrigerant is discharged to the temperature responsive expansion valve 160 along the refrigerant circulation line.

The refrigerant introduced into the temperature responsive expansion valve 160 is expanded by the temperature responsive expansion valve 160 and then supplied to the vehicle air conditioning unit 200 connected to the temperature responsive expansion valve 160 via a refrigerant circulation line The evaporator 240 of FIG.

At this time, the opening / closing door 212 of the vehicle air conditioning unit 200 is rotated so that the second outlet 214 is opened, the first outlet 213 is closed, the air exchanged with the refrigerant is cooled, (214), and is cooled.

The refrigerant heat exchanged with air in the evaporator 240 of the vehicle air conditioning unit 200 is led back to the temperature responsive expansion valve 160 connected to the evaporator 240 through a refrigerant circulation line, Is introduced into the accumulator (170) through a refrigerant circulation line connecting the temperature responsive expansion valve (160) and the accumulator (170) and a check valve (191).

The refrigerant separated from the accumulator (170) into gas and liquid circulates gas refrigerant to be supplied to the compressor (130) again.

Referring to FIG. 7, the flow of the refrigerant in the dehumidification cooling mode of the vehicle cooling / heating system including the first flow path switching valve 180 and the check valve 191 will be described.

The refrigerant flow in the dehumidification cooling mode is the same as that in the cooling mode except that the opening and closing amount of the opening and closing door 212 in the vehicle air conditioning unit 200 is adjusted to dehumidify the air discharged into the vehicle interior and then reheat.

In other words, since the air flow inside the vehicle air conditioning unit 200 becomes the indoor heat exchanger 220 in the evaporator 240, the dehumidified and cooled air in the evaporator 240 is supplied to the indoor heat exchanger 220 Reheated and supplied to the room.

The energy balance in a cooling system is "evaporator (evaporator) heat absorption + compressor output = condenser (heat exchanger) heat radiation".

Therefore, by the implementation according to the above-described construction, the indoor heat exchanger inside the vehicle air conditioning unit radiates heat in an amount required for reheating, and the remaining heat amount controls the flow of the refrigerant so as to radiate heat in the outdoor heat exchanger, .

Referring to FIG. 8, the refrigerant flow in the dehumidifying heating mode of the vehicle cooling / heating system including the first flow path switching valve 180 and the check valve 191 will be described.

In the dehumidifying heating mode, there are two-directional refrigerant flow, and the switching means for this flow is determined by the first flow path switching valve 180.

The temperature of the air is lowered by dehumidification and reheated to supply air at a higher temperature than that before entering the evaporator 240 included in the vehicle air conditioning unit 200.

Therefore, there is a flow in the first direction and the second direction in accordance with the switching of the first flow path switching valve 180.

The flow in the first direction is transmitted from the compressor 130 to the indoor heat exchanger 220 of the vehicle air conditioning unit 200 through the indoor heat exchanger 220 to the first flow path switching valve 180, The chiller 150 to the accumulator 170, the accumulator 170 to the compressor 130, the switching valve 180 to the electronic expansion valve 140, the electronic expansion valve 140 to the chiller 150, The flow of the refrigerant is shown in order.

And the flow in the second direction flows from the compressor 130 to the indoor heat exchanger 220 of the vehicle air conditioning unit 200 and from the indoor heat exchanger 220 to the first flow path switching valve 180, The control valve 180 is connected to the heat exchanger 120 and the heat exchanger 120 to the temperature responsive expansion valve 160 and the temperature responsive expansion valve 160 to the evaporator of the vehicle air conditioning unit 200. [ To the temperature responsive expansion valve 160 from the evaporator 240 to the check valve 191 and from the check valve 191 to the accumulator 170, and the refrigerant flows from the accumulator 170 to the compressor 130 in this order.

Wherein the first direction is the main flow and the second direction is the auxiliary flow.

A heat source for reheating is secured in the first direction and dehumidification is performed through the second direction.

In this case, when the valve is a valve for selectively selecting the first direction or the second direction, the first passage switching valve 180 is controlled by a method of intermittently interrupting the refrigerant of the evaporator 240, Or a valve for distributing the second direction at a predetermined ratio, the method of linearly distributing the refrigerant of the evaporator 240 is applied.

Referring to FIG. 9, an embodiment of the vehicular heating / cooling system including the first flow path switching valve 180, the check valve 191, and the internal heat exchanger 192 will be described.

The high pressure liquid refrigerant at the outlet of the heat exchanger 120 and the high pressure liquid refrigerant at the outlet of the evaporator 240 of the vehicle air conditioning unit 200 are supplied to the evaporator 240 in the eighth embodiment described above to further secure the supercooling degree of the refrigerant flowing to the evaporator 240. [ And an additional heat exchanger 192 for exchanging heat with the low-pressure gaseous refrigerant.

 Therefore, the performance of the refrigerant flowing to the evaporator 240 of the vehicle air conditioning unit 200 is improved, and the amount of refrigerant for ensuring the same performance is reduced, thereby reducing consumption power of the compressor.

Referring to FIG. 10, an embodiment of a vehicular heating and cooling system including an accumulator 170 and an internal heat exchanger 192 having the first passage switching valve 180 and a check valve 191 therein will be described.

The check valve 191 of [Embodiment 9] is integrally incorporated in the accumulator 170 without being placed on the refrigerant circulating flow path.

This is a method of integrating the check valve 191 in the port portion of the evaporator 240, which has two inlet ports of the accumulator 170.

Therefore, it is not necessary to secure a space for the refrigerant-side flow path for the check valve 191 in the piping section, and the welded portion by the branching portion that combines the flow in the chiller 150 and the flow in the evaporator 240 is referred to as 1 The effect of reducing the number of points can be obtained.

Referring to FIG. 11, an embodiment of a vehicular heating / cooling system including an accumulator 170 and an internal heat exchanger 192 having a two-way valve as the first flow path switching valve 180 and a check valve 191 inside ,

Way valve is replaced with a two-way valve in the first-flow switching valve 180 of [Embodiment 10].

This is because the flow of the refrigerant is switched to the heat exchanger 120 or the chiller 150 by the first flow path switching valve 180 while the flow of the refrigerant flowing into the heat exchanger 120 is controlled by the two- It is possible to control the flow rate to the chiller 150 by controlling the opening and closing amount of the electronic expansion valve 140.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

110: radiator 111: cooling fan
120: heat exchanger 130: compressor
140: Electronic expansion valve 150: Chiller
160: Temperature-sensitive expansion valve 170: Accumulator
180: first flow path switching valve 190: second flow path switching valve
191: Check valve 200: Vehicle air conditioning unit
210: air conditioner case 211: inlet
212: opening / closing door 213: first outlet
214: second outlet 220: indoor heat exchanger
230: auxiliary heater 231: heater sensor
240: Evaporator 241: Evaporator

Claims (5)

A heat exchanger for introducing a refrigerant and exchanging heat with outside air;
A compressor for introducing and compressing the refrigerant to discharge the compressed refrigerant;
An indoor heat exchanger installed in the vehicle air conditioning unit and performing heat exchange with air supplied to the vehicle interior using the refrigerant discharged from the compressor;
An electronic expansion valve for introducing the refrigerant discharged from the indoor heat exchanger to expand the refrigerant;
A chiller for exchanging heat between the cooling water circulating through the vehicle drive unit and the refrigerant drawn through the electronic expansion valve;
A temperature responsive expansion valve for introducing the refrigerant of any one of the heat exchanger and the chiller to expand the refrigerant according to the temperature of the evaporator outlet refrigerant installed in the vehicle air conditioning unit;
An accumulator for temporarily storing the refrigerant of either the chiller or the evaporator and separating the introduced refrigerant into a gas and a liquid and supplying the gaseous refrigerant to the compressor; And
And a first flow path switching valve provided on a branch line through which the refrigerant discharged from the indoor heat exchanger flows and selectively switching a flow path so as to flow the refrigerant selectively to any one of the heat exchanger and the electronic expansion valve.
The method according to claim 1,
The vehicle air conditioning unit
An air conditioning case for supplying air to the inside of the vehicle through a first outlet and a second outlet formed by partitioning the opening and closing door for sucking air through the inlet and selectively rotating the air sucked into the inside thereof;
An indoor heat exchanger provided at the first outlet side of the air conditioning case for exchanging heat between air supplied to the room interior of the vehicle through the first outlet and refrigerant drawn through the compressor;
An auxiliary heater disposed behind the indoor heat exchanger to selectively heat the air supplied to a room of the vehicle;
A heater sensor disposed behind the auxiliary heater and measuring a temperature of air supplied to the vehicle interior;
An evaporator provided at an inlet side of the air conditioning case for exchanging heat between the air sucked into the air conditioning case and the refrigerant introduced through the temperature responsive expansion valve; And
And an eva sensor for measuring the temperature of air passing through the evapotator.
The method according to claim 1,
And a second flow path switching valve provided on a branch line through which the refrigerant discharged from the heat exchanger and the chiller flows to selectively flow the refrigerant to either the accumulator or the temperature responsive expansion valve. system.
The method according to claim 1,
And a check valve for allowing the refrigerant to flow only from the evaporator to the accumulator side.
The method according to claim 1 or 3 or 4,
And an internal heat exchanger (IHX) for exchanging heat between the high-temperature liquid refrigerant flowing through the heat exchanger and the low-temperature vapor refrigerant flowing through the evaporator.

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