KR102587577B1 - Air conditioning system - Google Patents

Abstract

The air conditioning system of the present invention includes a compressor, a water-cooled condenser, an outdoor unit, a first expansion valve, a second expansion valve, a third expansion valve, a fourth expansion valve, a fifth expansion valve, a first internal heat exchanger, and a second internal heat exchanger. It includes an integrated internal heat exchanger, an evaporator, and a waste heat recovery unit. In the integrated internal heat exchanger, the refrigerant discharged from the water-cooled condenser or outdoor unit branches, then the branched refrigerants exchange heat with each other, and the medium-pressure and gaseous refrigerant vaporized by heat exchange is delivered to the compressor. And, depending on the cooling mode and heating mode, the low-pressure gaseous refrigerant discharged after being selectively expanded in one or more of the fourth expansion valve and the fifth expansion valve is delivered to the compressor, and the refrigerant inlet of the compressor through which the low-pressure refrigerant flows. Air conditioning that can improve both cooling and heating performance by using gas injection, which additionally injects medium-pressure gaseous refrigerant vaporized in an integrated internal heat exchanger into the area where medium pressure is formed between the refrigerant discharged at high pressure and the outlet of the compressor. It's about the system.

Description

Air conditioning system {Air conditioning system}

The present invention relates to an air conditioning system, and more specifically, to an air conditioning system that can be used to switch between indoor cooling and heating, and can improve both cooling and heating performance.

Recently, electric vehicles have been in the spotlight in the automotive field as a solution to problems such as implementing environmentally friendly technology and energy depletion.

Electric vehicles drive using motors powered by batteries or fuel cells, so they emit less carbon and produce less noise. Additionally, electric vehicles are environmentally friendly because they use motors that are more energy efficient than conventional engines.

Heat management is important in these electric vehicles because a lot of heat is generated when the battery and drive motor operate. And since it takes a long time to recharge the battery, efficient management of battery usage time is important. In particular, electric vehicles require more efficient energy management because the refrigerant compressor used for interior cooling and heating is also powered by electricity.

However, the conventional air conditioning system for electric vehicles uses a chiller to recover waste heat generated from the battery and electrical components when cooling the battery is necessary when cooling the interior. Since the chiller and the evaporator are connected in parallel, the flow rate of the refrigerant flowing into the evaporator is As the total flow rate flowing into the inlet side of the compressor increases and the evaporation pressure of the refrigerant increases, cooling performance deteriorates. In addition, when heating indoors, the outdoor unit and the chiller for waste heat recovery are connected in series with the outdoor unit. As the temperature on the low pressure side rises due to the increase in heat absorption during waste heat recovery, the temperature difference between the temperature of the outdoor air and the refrigerant passing through the outdoor unit decreases, and the heat absorption amount increases. There is a problem in that if the amount of waste heat recovery and absorption exceeds a certain level, the temperature of the refrigerant passing through the outdoor unit becomes higher than the temperature of the outdoor air, which causes heat dissipation and adversely affects heating performance.

KR 1637755 B1 (2016.07.01.)

The present invention was created to solve the problems described above. The purpose of the present invention is to enable switching between indoor cooling and heating, and to supply gaseous refrigerant to a compressor using gas injection to improve cooling and heating performance. The goal is to provide an air conditioning system that can improve both.

The air conditioning system of the present invention for achieving the above-described object includes a compressor 100 into which relatively low-pressure and medium-pressure refrigerant is introduced, compressing the introduced refrigerant and discharging it at relatively high pressure; A water-cooled condenser (200) that exchanges heat with cooling water and the high-pressure refrigerant discharged from the compressor (100); A first expansion valve 410 and a second expansion valve 420 that selectively expand the refrigerant discharged from the water-cooled condenser 200 to medium pressure depending on the cooling mode and heating mode; an outdoor unit (300) that transfers the medium-pressure refrigerant discharged from the second expansion valve (420) to the compressor (100); a third expansion valve 430 that selectively expands the refrigerant discharged from the outdoor unit 300 to medium pressure depending on the cooling mode and heating mode; Selectively depending on the cooling mode and heating mode, the refrigerant discharged from the water-cooled condenser 200 or the outdoor unit 300 is branched, and then the branched refrigerants are heat exchanged with each other, and the medium pressure and gaseous refrigerant vaporized by heat exchange is transferred to the compressor ( 100) integrated internal heat exchanger (500); a fourth expansion valve 440 and a fifth expansion valve 450 that selectively expand the medium-pressure and liquid refrigerant discharged from the integrated internal heat exchanger 500 to low pressure depending on the cooling mode and the heating mode; An evaporator 600 cools the interior of the vehicle by absorbing heat from the low-pressure refrigerant discharged from the fourth expansion valve 440, and transfers the low-pressure refrigerant discharged from the fourth expansion valve 440 to the compressor 100. ); and a waste heat recovery device (800) that cools the vehicle's electrical components or recovers waste heat by absorbing heat from the low-pressure refrigerant discharged from the fifth expansion valve (450). may include.

In addition, selectively depending on the cooling mode and heating mode, the refrigerant discharged from the water-cooled condenser 200 bypasses the second expansion valve 420 and passes through the outdoor unit 300, and then branches out, and some of the branched refrigerants The refrigerant passes through the third expansion valve 430, expands, and then flows into the integrated heat exchanger 500, or the refrigerant discharged from the water-cooled condenser 200 branches out and passes through the first expansion valve 410. After being expanded, it may flow into the integrated heat exchanger 500.

Additionally, the integrated heat exchanger 500 may include a first internal heat exchanger 510 and a second internal heat exchanger 520, each having a refrigerant flow path for heat exchanging branched refrigerants with each other.

In addition, the integrated heat exchanger 500 may further include an insulating material 530 interposed between the first internal heat exchanger 510 and the second internal heat exchanger 520.

In addition, one end is connected to the middle part of the compressor 100, which is an area where relatively medium pressure is formed between the refrigerant inlet and the refrigerant outlet of the compressor 100, and the first internal heat exchanger 510 and the second internal heat exchanger The group 520 may further include a gas injection line (L3) whose other end is connected to the outlet sides of each gaseous refrigerant.

Additionally, the gas injection line L3 may be connected to the compressor 100 in parallel with the first internal heat exchanger 510 and the second internal heat exchanger 520 through the fourth joint 550.

Additionally, the gas injection line L3 may further include a shut-off valve 570 installed between the compressor 100 and the fourth joint 550.

In addition, one end is connected to the outlet side of the water-cooled condenser 200 with the first joint 210, and the other end is connected to the inlet side of the first internal heat exchanger 510, where the gas injection line L3 is connected. It may further include a first connection line (L1) connected to the inlet side connected to the refrigerant flow path.

In addition, one end is connected to the outlet side of the outdoor unit 300 with the second joint 310, and the other end is connected to the inlet side of the second internal heat exchanger 520, and the gas injection line (L3) is connected to the refrigerant. It may further include a second connection line (L2) connected to the inlet side connected to the flow path.

Additionally, the evaporator 600 and the waste heat recovery device 800 may be connected in parallel to the outlet side of the second internal heat exchanger 520.

In addition, after passing through the second internal heat exchanger 520, the refrigerant branches off at the third joint 540 and is connected to the evaporator 600 and the waste heat recovery device 800, and the third joint 540 and the evaporator ( A fourth expansion valve 440 may be installed between the 600 and a fifth expansion valve 450 may be installed between the third joint 540 and the waste heat recovery device 800.

In addition, it may further include an accumulator 700, one side of which is connected to the outlet side of the evaporator 600 and the outlet side of the waste heat recovery device 800, and the other side connected to the inlet side of the compressor 100.

Additionally, the water-cooled condenser 200 can be selectively connected to either the radiator 910 or the heater core 920 to circulate cooling water.

In addition, in the cooling mode, the refrigerant discharged from the water-cooled condenser 200 bypasses the first internal heat exchanger 510 and the second expansion valve 420 and branches out after passing through the outdoor unit 300, and a portion of the branched The refrigerant passes through the third expansion valve 430, expands, and then flows into the second internal heat exchanger 520, and the remaining branched refrigerant flows into the second internal heat exchanger 520 in an unexpanded state. The refrigerants exchange heat with each other in the second internal heat exchanger 520, and the refrigerant passing through the third expansion valve 430 is vaporized in the second internal heat exchanger 520, and the medium pressure and gaseous refrigerant is supplied to the refrigerant inlet of the compressor 100. It flows into the middle part of the compressor 100, which is an area where relatively medium pressure is formed between the refrigerant and the refrigerant outlet, and the remaining refrigerant that does not pass through the third expansion valve 430 is cooled in the second internal heat exchanger 520. Liquid refrigerant may flow into the evaporator 600 and the waste heat recovery device 800.

In addition, the liquid refrigerant that has passed through the second internal heat exchanger 520 is branched, and some of the branched refrigerant is expanded through the fourth expansion valve 440 and then flows into the evaporator 600, and the remaining branched refrigerant is expanded. After being expanded through the fifth expansion valve 450, it may flow into the waste heat recovery device 800.

In addition, in the heating mode, the refrigerant discharged from the water-cooled condenser 200 is branched, and some of the branched refrigerant passes through the first expansion valve 410, expands, and then flows into the first internal heat exchanger 510. The remaining branched refrigerant flows into the first internal heat exchanger 510 in an unexpanded state, and the refrigerants exchange heat with each other in the first internal heat exchanger 510, and the refrigerant passing through the first expansion valve 410 is the first internal heat exchanger 510. 1 Vaporized in the internal heat exchanger 410, the medium pressure and gaseous refrigerant flows into the middle part of the compressor 100, which is an area where relatively medium pressure is formed between the refrigerant inlet and the refrigerant outlet of the compressor 100, and the first The remaining refrigerant that did not pass through the expansion valve 410 is cooled in the first internal heat exchanger 510, and the liquid refrigerant passes through the second expansion valve 420, expands, and then passes through the outdoor unit 300 to the second internal heat exchanger. After bypassing (520), it may flow into the waste heat recovery device (800).

In addition, the third expansion valve 430 is closed, and the fourth expansion valve 440 installed on the inlet side of the evaporator 600 is closed, so refrigerant does not flow to the evaporator 600, and the waste heat recovery device 800 The fifth expansion valve 450 installed on the inlet side is opened so that the refrigerant bypasses the fifth expansion valve 450 and then flows into the waste heat recovery device 800.

In addition, in the dehumidifying mode, the refrigerant discharged from the water-cooled condenser 200 is branched, and some of the branched refrigerant passes through the first expansion valve 410, expands, and then flows into the first internal heat exchanger 510. The remaining branched refrigerant flows into the first internal heat exchanger 510 in an unexpanded state, and the refrigerants exchange heat with each other in the first internal heat exchanger 510, and the refrigerant passing through the first expansion valve 410 is the first internal heat exchanger 510. 1 Vaporized in the internal heat exchanger 410, the medium pressure and gaseous refrigerant flows into the middle part of the compressor 100, which is an area where relatively medium pressure is formed between the refrigerant inlet and the refrigerant outlet of the compressor 100, and the first The remaining refrigerant that did not pass through the expansion valve 410 is cooled in the first internal heat exchanger 510, and the liquid refrigerant passes through the second expansion valve 420, expands, and then passes through the outdoor unit 300 to the second internal heat exchanger. After bypassing (520), it may be branched and flow into the evaporator (600) and the waste heat recovery unit (800).

In addition, the third expansion valve 430 is closed, and the fourth expansion valve 440 installed on the inlet side of the evaporator 600 is opened so that the refrigerant bypasses the fourth expansion valve 440 and then evaporates ( 600), and the fifth expansion valve 450 installed on the inlet side of the waste heat recovery device 800 is opened so that the refrigerant can bypass the fifth expansion valve 450 and then flow into the waste heat recovery device 800. there is.

The air conditioning system of the present invention supplies gaseous refrigerant to the compressor using gas injection when cooling the room, thereby reducing the flow rate of the gaseous refrigerant flowing into the inlet side of the compressor, thereby reducing the suction pressure of the compressor, thereby improving cooling performance on the evaporator side. .

In addition, when heating indoors, the increase in pressure of the refrigerant on the outdoor unit side is minimized, thereby increasing the heat absorption amount in the outdoor unit. Even if the waste heat recovery heat absorption amount increases, the outdoor unit side can continue to absorb heat, which has the advantage of improving heating performance.

1 is a configuration diagram showing an operating state in a cooling mode of an air conditioning system according to an embodiment of the present invention.
Figure 2 is a schematic diagram showing one embodiment of refrigerant flow in an integrated internal heat exchanger of an air conditioning system according to an embodiment of the present invention.
Figure 3 is a configuration diagram showing an operating state in a heating mode of an air conditioning system according to an embodiment of the present invention.
Figure 4 is a configuration diagram showing an operating state in a dehumidifying mode of an air conditioning system according to an embodiment of the present invention.

Hereinafter, the air conditioning system of the present invention having the above-described configuration will be described in detail with reference to the attached drawings.

Figure 1 is a configuration diagram showing the operating state in a cooling mode of an air conditioning system according to an embodiment of the present invention, and Figure 2 is a diagram showing the refrigerant flow in the integrated internal heat exchanger of the air conditioning system according to an embodiment of the present invention. This is a schematic diagram showing an example of.

1 and 2, the air conditioning system according to the first embodiment of the present invention includes a compressor 100, a water-cooled condenser 200, an outdoor unit 300, a first expansion valve 410, and a second expansion valve ( 420), a third expansion valve 430, a fourth expansion valve 440, a fifth expansion valve 450, an integrated internal heat exchanger including a first internal heat exchanger 510 and a second internal heat exchanger 520. It may be composed of a generator 500, an evaporator 600, and a waste heat recovery device 800, and may further include an accumulator 700. And a first connection line (L1) is formed connecting the outlet side of the water-cooled condenser 200 and the inlet side of the first internal heat exchanger 510, and the outlet side of the outdoor unit 300 and the inlet side of the second internal heat exchanger. A second connection line (L2) connecting the two sides is formed, and a relatively medium pressure is formed between the refrigerant inlet and the refrigerant outlet of the compressor 100 of the first internal heat exchanger 510 and the second internal heat exchanger 520. A gas injection line (L3) connected in parallel may be formed in the middle part of the compressor 100, which is the area where the compressor 100 is compressed. And the evaporator 600 and the waste heat recovery device 800 are connected in parallel to the outlet side of the second internal heat exchanger 520.

First, the compressor 100 may be an electric compressor driven by receiving electric power, and serves to suction and compress the refrigerant and discharge it toward the water-cooled condenser 200. Additionally, the compressor 100 may be a gas injection compressor with a structure in which refrigerant can flow into the middle portion between the inlet side and the outlet side and be compressed. That is, in the compressor 100, relatively low-pressure refrigerant flows into the inlet side, the refrigerant is compressed as it passes through the compressor 100, and relatively high-pressure refrigerant is discharged to the outlet side. In the process of compressing the low-pressure refrigerant to high pressure, The pressure of the refrigerant gradually increases, and the refrigerant is configured to flow into the middle part, which is an area that forms a medium pressure between the refrigerant inlet on the low pressure side and the refrigerant outlet on the high pressure side. Therefore, the compressor 100 allows low-pressure refrigerant to flow into the inlet side and medium-pressure refrigerant to the middle portion, and relatively low-pressure and medium-pressure refrigerant flows into the compressor 100, is compressed, and then discharges the refrigerant at a relatively high pressure. there is.

The water-cooled condenser 200 may be installed outside the vehicle, and the water-cooled condenser 200 exchanges heat with the refrigerant discharged from the compressor 100 using circulating cooling water. Here, the water-cooled condenser 200 is connected to the radiator 910 for cooling the vehicle's electrical components, etc., so that the refrigerant passing through the water-cooled condenser 200 is condensed by the coolant, or is placed inside the vehicle to heat the vehicle. The refrigerant connected to the heater core used and passing through the water-cooled condenser 200 may be heated by the cooling water. In addition, the water-cooled condenser 200 is connected to the compressor 100 at its inlet side and branches into two refrigerant lines at its outlet side, and the branched refrigerant lines are respectively connected to the inlet side of the first internal heat exchanger 510.

The outdoor unit 300 may be installed outside the vehicle, and the outdoor unit 300 may be an air-cooled condenser that condenses the refrigerant by heat-exchanging the passing refrigerant with external air or heats the refrigerant by absorbing external heat. And the inlet side of the outdoor unit 300 is connected to the outlet side of the first internal heat exchanger 510, and the outdoor unit 300 is branched into two refrigerant lines at the outlet side, and the branched refrigerant lines are connected to the second internal heat exchanger 510. It is connected to the inlet side of (520).

The first expansion valve 410, the second expansion valve 420, the third expansion valve 430, the fourth expansion valve 440, and the fifth expansion valve 450 expand or open the passing refrigerant by throttling it. It functions to bypass the refrigerant or closes to block the flow of the refrigerant.

And the refrigerant branched from the first internal heat exchanger 510 or the second internal heat exchanger 520 depending on the operating status of the first expansion valve 410, the second expansion valve 420, and the third expansion valve 430. It can be controlled so that heat exchange between them occurs.

The integrated internal heat exchanger 500 includes a first internal heat exchanger 510 and a second internal heat exchanger 520, and the first internal heat exchanger 510 and the second internal heat exchanger 520 each contain a refrigerant. Two refrigerant flow paths are formed, and the refrigerants can be formed to exchange heat with each other as they pass through each other. Accordingly, the first internal heat exchanger 510 and the second internal heat exchanger 520 may each be formed with two inlets through which refrigerant flows in and two outlets through which refrigerant is discharged. At this time, FIG. 2 shows that the refrigerants flow in opposite directions in the first internal heat exchanger 510 and the second internal heat exchanger 520, but they may flow in the same direction. In addition, the first internal heat exchanger 510 and the second internal heat exchanger 520 may have the same or different flow directions of the refrigerant, and the shape of the heat exchanger may also be the same or different. In addition, the integrated internal heat exchanger 500 is formed by combining the first internal heat exchanger 510 and the second internal heat exchanger 520 with an insulating material 530 interposed between the first internal heat exchanger 510 and the second internal heat exchanger 520. It may be configured with an integrated internal heat exchanger (500).

The evaporator 600 may be installed in an air conditioning device located inside the vehicle, and the evaporator 600 functions to cool the interior by exchanging heat with the incoming refrigerant and the blown air. Additionally, the inlet side of the evaporator 600 may be connected to the first internal heat exchanger 510 of the integrated internal heat exchanger 500, and the outlet side of the evaporator 600 may be connected to the accumulator 700.

The waste heat recovery device 800 is a means of recovering waste heat generated from electrical components such as batteries, drive motors, and inverters only in the heating mode, and cooling the electrical components in the cooling mode. For example, the waste heat recovery device 800 may be a battery chiller, and in the waste heat recovery device 800, refrigerant and coolant can exchange heat with each other, and the heat-exchanged coolant can be used to cool electrical components or recover waste heat. there is. Additionally, the inlet side of the waste heat recovery device 800 may be connected to the second internal heat exchanger 520 of the integrated internal heat exchanger 500, and the outlet side of the waste heat recovery device 800 may be connected to the accumulator 700.

One side of the accumulator 700 is connected to the outlet side of the evaporator 600 and the outlet side of the waste heat recovery device 800, and the other side of the accumulator 700 is connected to the inlet side of the compressor 100, so that the accumulator 700 It serves to store the incoming refrigerant and then send the gaseous refrigerant to the inlet side of the compressor (100).

Here, in the integrated internal heat exchanger 500, the first internal heat exchanger 510 and the second internal heat exchanger 520 are connected in parallel to the middle portion between the inlet and outlet sides of the compressor 100. That is, the outlet side of one refrigerant flow path of the first internal heat exchanger 510 and the outlet side of one refrigerant flow path of the second internal heat exchanger 520 are connected to the compressor 100 through the fourth joint 550. A gas injection line (L3) connected to the middle part is formed. Additionally, a shut-off valve 570 is installed between the fourth joint 550 and the middle portion of the compressor 100 to allow the refrigerant to flow or to block the flow of the refrigerant. In addition, a first connection line (L1) has one end connected to the outlet side of the water-cooled condenser 200 with the first joint 210 and connected to the inlet side of one refrigerant flow path of the first internal heat exchanger 510. is formed At this time, the first expansion valve 410 is installed on the first connection line (L1) between the first joint 210 and the first internal heat exchanger 510. In addition, a second connection line (L2) is formed, one end of which is connected to the outlet side of the outdoor unit 300 with the second joint 310, and the other end connected to the inlet side of one refrigerant flow path of the second internal heat exchanger 520. do. At this time, the third expansion valve 430 is installed on the second connection line (L2) between the second joint 310 and the second internal heat exchanger 520.

And in the first internal heat exchanger 510, the inlet side of another refrigerant flow path is connected to the outlet side of the water-cooled condenser 200 through the first joint 210, and the outlet side of the other refrigerant flow path is connected to the outlet side of the first internal heat exchanger 510. It is connected to the inlet side of the outdoor unit 300. At this time, the second expansion valve 420 is installed on the refrigerant line between the first internal heat exchanger 510 and the outdoor unit 300. In addition, in the second internal heat exchanger 520, the inlet side of another refrigerant flow path is connected to the outlet side of the outdoor unit 300 through the second joint 310, and the outlet side of the other refrigerant flow path is connected to the outlet side of the outdoor unit 300 through the second joint 310. It is connected to the evaporator 600 and the waste heat recovery device 800 through the third joint 540. At this time, the outlet side of the other refrigerant flow path of the second internal heat exchanger 520 is connected to the third joint 540, and branches off from the third joint 540 to connect the evaporator 600 to the third joint 540. and a waste heat recovery device 800 are connected in parallel. And the outlet side of the evaporator 600 and the outlet side of the waste heat recovery device 800 are connected to the inlet side of the accumulator 700 through the fifth joint 560. In addition, a fourth expansion valve 440 is installed on the refrigerant line between the third joint 540 and the evaporator 600, and a fifth expansion valve is installed on the refrigerant line between the third joint 540 and the waste heat recovery device 800. An expansion valve 440 is installed.

Accordingly, the flow of refrigerant passing through the integrated internal heat exchanger 500 can be controlled according to the operation of the first expansion valve 410, the second expansion valve 420, and the third expansion valve 430. And the flow of refrigerant passing through the evaporator 600 and the waste heat recovery device 800 can be controlled according to the operation of the fourth expansion valve 440 and the fifth expansion valve 450.

In addition, although not shown, the air conditioning device has a blower installed on one side to blow air, and a temperature control door may be installed inside the air conditioning device. In addition, the evaporator and heater core placed in the air conditioning device allow the air discharged from the blower to enter the room after passing only the evaporator, or pass through the heater core after passing through the evaporator, depending on the operation of the temperature control door. Can be deployed and configured.

Hereinafter, operations according to operating modes of the air conditioning system according to an embodiment of the present invention will be described.

1. In cooling mode

1 is a configuration diagram showing an operating state in a cooling mode of an air conditioning system according to an embodiment of the present invention.

Referring to FIG. 1, the compressor 100 operates and high temperature and high pressure refrigerant is discharged from the compressor 100. And the refrigerant discharged from the compressor 100 passes through the water-cooled condenser 200. At this time, the water-cooled condenser 200 is connected to the radiator 910 and coolant circulates, and the refrigerant passing through the water-cooled condenser 200 is condensed by the coolant. Afterwards, the refrigerant that has passed through the water-cooled condenser 200 sequentially passes through the first joint 210, the first internal heat exchanger 510, and the second expansion valve 420, and then flows into the outdoor unit 300. At this time, the second expansion valve 420 is operated in a fully open state so that the refrigerant is bypassed without being throttled. And the first expansion valve 410 is closed, so the refrigerant line connecting the first joint 210 to the first expansion valve 410, the first internal heat exchanger 510, and the fourth joint 550 contains refrigerant. It doesn't flow.

The refrigerant flowing into the outdoor unit 300 is cooled and condensed by external air, etc., the condensed refrigerant branches out at the second joint 310, and some of the branched refrigerant passes through the third expansion valve 430 and is throttled. It expands to medium pressure and then flows into the second internal heat exchanger (520). And the remaining branched refrigerant flows into the second internal heat exchanger 520 in an unexpanded state. Therefore, in the second internal heat exchanger 520, the expanded refrigerant and the unexpanded refrigerant exchange heat with each other, and the expanded refrigerant is vaporized to become a medium-pressure gaseous refrigerant and then connected to the fourth joint 550 and the shut-off valve 570. It flows into the middle part of the compressor 100, and after the unexpanded refrigerant is cooled, the liquid refrigerant flows into the third joint 540. And some of the refrigerant branched from the third joint 540 passes through the fourth expansion valve 440, is compressed, expands to low pressure, and then flows into the evaporator 600, and the remaining branched refrigerant flows through the fifth expansion valve (440). 450), it is constricted and expanded to low pressure, and then flows into the waste heat recovery device (800). In addition, the refrigerant expanded by the fourth expansion valve 440 passes through the evaporator 600 and exchanges heat with the air blown by the blower of the air conditioning device, and as the refrigerant evaporates, the air is cooled, and the cooled air is supplied to the interior of the vehicle. is supplied to the room to cool the room. Additionally, the refrigerant expanded by the fifth expansion valve 450 cools the battery while passing through the waste heat recovery device 800, allowing the refrigerant to evaporate.

And the low-pressure gaseous refrigerant evaporated in the evaporator 600 and the low-pressure gaseous refrigerant evaporated in the waste heat recovery unit 800 join at the fifth joint 560 and then flow into the inlet side of the compressor 100 through the accumulator 700. do. Accordingly, the compressor 100 compresses the gaseous refrigerant flowing into the inlet side and the gaseous refrigerant flowing into the middle portion and discharges them again to the outlet side, and while repeating the above-described process, the refrigerant is circulated to cool the room.

Accordingly, the air conditioning system of the present invention supplies gaseous refrigerant to the compressor using gas injection when cooling the room, thereby reducing the flow rate of gaseous refrigerant flowing into the inlet side of the compressor, thereby reducing the suction pressure of the compressor, thereby improving cooling performance on the evaporator side. there is.

2. In heating mode

Figure 3 is a configuration diagram showing an operating state in a heating mode of an air conditioning system according to an embodiment of the present invention.

Referring to FIG. 3, the compressor 100 operates and high temperature and high pressure refrigerant is discharged from the compressor 100. And the refrigerant discharged from the compressor 100 passes through the water-cooled condenser 200. At this time, the water-cooled condenser 200 is connected to the heater core 920 and coolant is circulated, and the refrigerant passing through the water-cooled condenser 200 is heated by the coolant. In addition, the heater core 920 may be placed in an air conditioning device provided inside the vehicle, and the air blown by the blower of the air conditioning device may exchange heat as it passes through the heater core 920, thereby heating the air. Air is supplied to the interior of the vehicle to heat the interior.

Afterwards, the refrigerant that has passed through the water-cooled condenser 200 is branched at the first joint 210, and some of the branched refrigerant passes through the first expansion valve 410, is compressed, and is expanded to medium pressure before being transferred to the first internal heat exchanger ( 510). And the remaining branched refrigerant flows into the first internal heat exchanger 510 in an unexpanded state. Therefore, in the first internal heat exchanger 510, the expanded refrigerant and the unexpanded refrigerant exchange heat with each other, and the expanded refrigerant is vaporized to become a medium-pressure gaseous refrigerant and then connected to the fourth joint 550 and the shut-off valve 570. It flows into the middle part of the compressor 100, and after the unexpanded refrigerant is cooled, the liquid refrigerant flows into the second expansion valve 420.

The refrigerant flowing into the second expansion valve 420 is expanded to low pressure by throttling and then flows into the outdoor unit 300. The refrigerant flowing into the outdoor unit 300 is cooled and condensed by external air, etc., and the condensed refrigerant flows into the second internal heat exchanger (520) through the second joint (310). At this time, the third expansion valve 430 is closed, so the refrigerant line connecting the second joint 310 to the third expansion valve 430, the second internal heat exchanger 520, and the fourth joint 550 contains refrigerant. does not flow

The refrigerant flowing into the second internal heat exchanger 520 bypasses the second internal heat exchanger 520 and then flows into the fifth expansion valve 450 through the third joint 540, and the refrigerant is in an open state. After passing through the fifth expansion valve 450, it flows into the waste heat recovery device 800. The refrigerant flowing into the waste heat recovery device 800 absorbs waste heat from electrical components or batteries and is evaporated. At this time, the fourth expansion valve 440 is closed, so no refrigerant flows in the refrigerant line connecting the third joint 540 to the fourth expansion valve 440, the evaporator 600, and the fifth joint 560. .

The low-pressure refrigerant evaporated in the waste heat recovery device 800 passes through the fifth joint 560 and then flows into the inlet side of the compressor 100 through the accumulator 700.

Accordingly, the compressor 100 compresses the gaseous refrigerant flowing into the inlet side and the gaseous refrigerant flowing into the middle portion and discharges them again to the outlet side. By repeating the above-described process, the refrigerant is circulated to heat the room.

Accordingly, the air conditioning system of the present invention minimizes the increase in pressure of the refrigerant on the outdoor unit during indoor heating, thereby increasing the heat absorption in the outdoor unit, and even if the waste heat recovery heat absorption increases, the outdoor unit can continue to absorb heat, improving heating performance. There is an advantage.

3. In dehumidifying mode

Figure 4 is a configuration diagram showing an operating state in a dehumidifying mode of an air conditioning system according to an embodiment of the present invention.

Referring to FIG. 4, in the dehumidifying mode, the fourth expansion valve 440 is additionally opened in the heating mode, and from the third joint 540 to the fourth expansion valve 440, the evaporator 600, and the fifth Refrigerant flows in the refrigerant line connecting the joint 560. That is, the refrigerant is branched at the third joint 540, some of the branched refrigerant flows into the evaporator 600, and the remaining branched refrigerant flows into the waste heat recovery device 800. Here, the flow rate of the refrigerant flowing into the evaporator 600 and the waste heat recovery device 800 can be adjusted by adjusting the degree of opening of the fourth expansion valve 440 and the fifth expansion valve 450.

Then, the low-pressure gaseous refrigerant evaporated while passing through the evaporator 600 and the low-pressure gaseous refrigerant evaporated in the waste heat recovery unit 800 join at the fifth joint 560 and then flow into the inlet side of the compressor 100, and the compressor ( In 100), the gaseous refrigerant flowing into the inlet side and the gaseous refrigerant flowing into the middle part are compressed and discharged again to the outlet side, and the refrigerant is circulated while repeating the above-described process.

Therefore, the air blown by the blower of the air conditioning device is heated as it passes through the heater core 920 after the moisture is removed as it passes through the evaporator 600, and the dehumidified and heated air is supplied to the interior of the vehicle to dehumidify the interior air. and heating is performed.

The present invention is not limited to the above-described embodiments, and its scope of application is diverse, and anyone skilled in the art can understand it without departing from the gist of the invention as claimed in the claims. Of course, various modifications are possible.

100: Compressor
200: water-cooled condenser 210: first joint
300: Outdoor unit 310: Second joint
410: first expansion valve 420: second expansion valve
430: Third expansion valve 440: Fourth expansion valve
450: Fifth expansion valve
500: Integrated internal heat exchanger 510: First internal heat exchanger
520: second internal heat exchanger 530: insulation material
540: 3rd joint 550: 4th joint
560: Fifth joint 570: Shut-off valve
600: Evaporator
700: Accumulator
800: Waste heat recovery device
910: Radiator 920: Heater Core

Claims (19)

A compressor 100 into which relatively low-pressure and medium-pressure refrigerant flows, compresses the introduced refrigerant and discharges it at relatively high pressure;
A water-cooled condenser (200) that exchanges heat with cooling water and the high-pressure refrigerant discharged from the compressor (100);
A first expansion valve 410 and a second expansion valve 420 that selectively expand the refrigerant discharged from the water-cooled condenser 200 to medium pressure depending on the cooling mode and heating mode;
an outdoor unit (300) that transfers the medium-pressure refrigerant discharged from the second expansion valve (420) to the compressor (100);
a third expansion valve 430 that selectively expands the refrigerant discharged from the outdoor unit 300 to medium pressure depending on the cooling mode and heating mode;
Selectively depending on the cooling mode and heating mode, the refrigerant discharged from the water-cooled condenser 200 or the outdoor unit 300 is branched, and then the branched refrigerants are heat exchanged with each other, and the medium pressure and gaseous refrigerant vaporized by heat exchange is transferred to the compressor ( 100) integrated internal heat exchanger (500);
a fourth expansion valve 440 and a fifth expansion valve 450 that selectively expand the medium-pressure and liquid refrigerant discharged from the integrated internal heat exchanger 500 to low pressure depending on the cooling mode and the heating mode;
An evaporator 600 cools the interior of the vehicle by absorbing heat from the low-pressure refrigerant discharged from the fourth expansion valve 440, and transfers the low-pressure refrigerant discharged from the fourth expansion valve 440 to the compressor 100. ); and
A waste heat recovery device (800) that cools the vehicle's electrical components or recovers waste heat by absorbing heat from the low-pressure refrigerant discharged from the fifth expansion valve (450);
An air conditioning system including.
According to paragraph 1,
Optionally according to cooling mode and heating mode,
The refrigerant discharged from the water-cooled condenser 200 bypasses the second expansion valve 420 and branches out after passing through the outdoor unit 300, and some of the branched refrigerant passes through the third expansion valve 430. After expansion, it flows into the integrated internal heat exchanger (500),
An air conditioning system, characterized in that the refrigerant discharged from the water-cooled condenser (200) branches, passes through the first expansion valve (410), expands, and then flows into the integrated internal heat exchanger (500).
According to paragraph 2,
The integrated internal heat exchanger (500) is an air conditioning system including a first internal heat exchanger (510) and a second internal heat exchanger (520), each having a refrigerant flow path for heat exchanging branched refrigerants with each other.
According to paragraph 3,
The integrated internal heat exchanger (500) is an air conditioning system further comprising an insulation material (530) interposed between the first internal heat exchanger (510) and the second internal heat exchanger (520).
According to paragraph 3,
One end is connected to the middle part of the compressor 100, which is an area where a relatively medium pressure is formed between the refrigerant inlet and the refrigerant outlet of the compressor 100, and the first internal heat exchanger 510 and the second internal heat exchanger ( 520) An air conditioning system further comprising a gas injection line (L3) whose other end is connected to each gaseous refrigerant outlet side.
According to clause 5,
The gas injection line (L3) is,
An air conditioning system characterized in that a first internal heat exchanger (510) and a second internal heat exchanger (520) are connected in parallel to the compressor (100) by a fourth joint (550).
According to clause 6,
The gas injection line (L3) is,
An air conditioning system further comprising a shut-off valve (570) installed between the compressor (100) and the fourth joint (550).
According to clause 6,
A refrigerant passage having one end connected to the outlet side of the water-cooled condenser 200 with a first joint 210 and the other end connected to the inlet side of the first internal heat exchanger 510 to which the gas injection line L3 is connected. An air conditioning system further comprising a first connection line (L1) connected to the inlet side.
According to clause 6,
One end is connected to the outlet side of the outdoor unit 300 with a second joint 310, and the other end is connected to the inlet side of the second internal heat exchanger 520, and is connected to the refrigerant passage to which the gas injection line L3 is connected. An air conditioning system further comprising a second connection line (L2) connected to the connected inlet side.
According to clause 9,
An air conditioning system wherein the evaporator (600) and the waste heat recovery device (800) are connected in parallel to the outlet side of the second internal heat exchanger (520).
According to clause 10,
After passing through the second internal heat exchanger 520, the refrigerant branches off at the third joint 540 and is connected to the evaporator 600 and the waste heat recovery device 800, and the third joint 540 and the evaporator 600 An air conditioning system characterized in that a fourth expansion valve (440) is installed between and a fifth expansion valve (450) is installed between the third joint (540) and the waste heat recovery device (800).
According to paragraph 1,
An air conditioning system further comprising an accumulator (700), one side of which is connected to the outlet side of the evaporator (600) and the waste heat recovery device (800), and the other side of which is connected to the inlet side of the compressor (100).
According to paragraph 1,
The water-cooled condenser (200) is selectively connected to one of the radiator (910) and the heater core (920) to circulate cooling water.
According to paragraph 3,
In cooling mode,
The refrigerant discharged from the water-cooled condenser 200 bypasses the first internal heat exchanger 510 and the second expansion valve 420 and branches out after passing through the outdoor unit 300, and some of the branched refrigerant passes through the third expansion valve. After passing through (430) and expanding, it flows into the second internal heat exchanger (520), and the remaining refrigerant that branches out flows into the second internal heat exchanger (520) in an unexpanded state, and the second internal heat exchanger ( In 520), the refrigerants exchange heat with each other, and the refrigerant that has passed through the third expansion valve 430 is vaporized in the second internal heat exchanger 520, so that the medium pressure and gaseous refrigerant are relative to each other between the refrigerant inlet and the refrigerant outlet of the compressor 100. flows into the middle part of the compressor 100, which is the area where intermediate pressure is formed, and the remaining refrigerant that does not pass through the third expansion valve 430 is cooled in the second internal heat exchanger 520, and the liquid refrigerant is transferred to the evaporator ( 600) and an air conditioning system characterized in that it flows into a waste heat recovery device (800).
According to clause 14,
The liquid refrigerant that has passed through the second internal heat exchanger 520 is branched, and some of the branched refrigerant is expanded through the fourth expansion valve 440 and then flows into the evaporator 600, and the remaining branched refrigerant is expanded into the fifth expansion valve 440. An air conditioning system characterized in that it is expanded through an expansion valve (450) and then flows into the waste heat recovery device (800).
According to paragraph 3,
In heating mode,
The refrigerant discharged from the water-cooled condenser 200 is branched, and some of the branched refrigerant passes through the first expansion valve 410 and expands, then flows into the first internal heat exchanger 510, and the remaining branched refrigerant expands. The refrigerant flows into the first internal heat exchanger (510) in an unused state, and the refrigerants exchange heat with each other in the first internal heat exchanger (510) and pass through the first expansion valve (410). ) is vaporized and the medium pressure and gaseous refrigerant flows into the middle part of the compressor 100, which is an area where a relatively medium pressure is formed between the refrigerant inlet and the refrigerant outlet of the compressor 100, and the first expansion valve 410 The remaining refrigerant that did not pass is cooled in the first internal heat exchanger (510), and the liquid refrigerant passes through the second expansion valve (420), expands, and then bypasses the second internal heat exchanger (520) via the outdoor unit (300). An air conditioning system characterized in that it is then introduced into the waste heat recovery device (800).
According to clause 16,
The third expansion valve 430 is closed,
The fourth expansion valve 440 installed on the inlet side of the evaporator 600 is closed so that refrigerant does not flow into the evaporator 600.
The fifth expansion valve (450) installed on the inlet side of the waste heat recovery device (800) is opened so that the refrigerant bypasses the fifth expansion valve (450) and then flows into the waste heat recovery device (800).
According to paragraph 3,
In dehumidifying mode,
The refrigerant discharged from the water-cooled condenser 200 is branched, and some of the branched refrigerant passes through the first expansion valve 410 and expands, then flows into the first internal heat exchanger 510, and the remaining branched refrigerant expands. The refrigerant flows into the first internal heat exchanger (510) in an unused state, and the refrigerants exchange heat with each other in the first internal heat exchanger (510) and pass through the first expansion valve (410). ) is vaporized and the medium pressure and gaseous refrigerant flows into the middle part of the compressor 100, which is an area where a relatively medium pressure is formed between the refrigerant inlet and the refrigerant outlet of the compressor 100, and the first expansion valve 410 The remaining refrigerant that did not pass is cooled in the first internal heat exchanger (510), and the liquid refrigerant passes through the second expansion valve (420), expands, and then bypasses the second internal heat exchanger (520) via the outdoor unit (300). The air conditioning system is then branched and flows into the evaporator (600) and the waste heat recovery unit (800).
According to clause 18,
The third expansion valve 430 is closed,
The fourth expansion valve 440 installed on the inlet side of the evaporator 600 is opened so that the refrigerant bypasses the fourth expansion valve 440 and then flows into the evaporator 600,
The fifth expansion valve (450) installed on the inlet side of the waste heat recovery device (800) is opened so that the refrigerant bypasses the fifth expansion valve (450) and then flows into the waste heat recovery device (800).