KR20140084398A - Heat pump system for vehicle - Google Patents

Abstract

The present invention relates to a heat pump system for a vehicle, and more particularly, to a heat pump system for a vehicle in which a refrigerant circulates in a compressor, an indoor heat exchanger, an outdoor heat exchanger, and an evaporator. The heat pump system can reduce a refrigerant flow sound and increase a refrigerant flow rate by increasing sub-cool of refrigerant discharged from the indoor heat exchanger because an inside heat exchanger for exchanging heat between refrigerant discharged from the indoor heat exchanger and waste heat of electronic units of the vehicle is installed on a refrigerant circulation line of an outlet side of the indoor heat exchanger, thereby increasing heating performance and efficiency by enhancing heat emission performance of the outdoor heat exchanger. Moreover, the heat pump system can first recover waste heat from the electronic units of the vehicle, second recover remaining heat of the refrigerant of the outlet of the indoor heat exchanger from the inside heat exchanger, and then, exchange heat with a low temperature refrigerant flowing in a first bypass line from heat supplying means mounted in the first bypass line, thereby enhancing the heating performance and efficiency.

Description

[0001] Heat pump system for vehicle [0002]

The present invention relates to a heat pump system for a vehicle, and more particularly, to a heat pump system in which a refrigerant is circulated in a circulating heat pump system including a compressor, an indoor heat exchanger, an outdoor heat exchanger and an evaporator, And an internal heat exchanger for exchanging heat between the refrigerant discharged from the indoor heat exchanger and the waste heat of the vehicle electrical equipment.

Background Art [0002] A vehicle air conditioner generally includes a cooling system for cooling the interior of a vehicle and a heating system for heating the interior of the vehicle. Wherein the cooling system is configured to cool air in the vehicle interior by exchanging air passing through the outside of the evaporator at the evaporator side of the refrigerant cycle with the refrigerant flowing in the evaporator to convert into cool air, 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.

A heat pump system which can selectively perform cooling and heating by switching the flow direction of refrigerant by using one refrigerant cycle is different from the above vehicle air conditioning 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), and a direction control valve for switching the flow direction of the refrigerant do. 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 kinds of such a heat pump system for vehicles have been proposed, and a representative example thereof is shown in Fig.

1 includes a compressor 30 for compressing and discharging a refrigerant, an indoor heat exchanger 32 for dissipating heat of a refrigerant discharged from the compressor 30, A first expansion valve 34 and a first bypass valve 36 for selectively passing the refrigerant passed through the heat exchanger 32 and a first expansion valve 34 or a first bypass valve 36 An evaporator 60 for evaporating the refrigerant that has passed through the outdoor heat exchanger 48, and a refrigerant flow passage for passing the refrigerant passed through the evaporator 60 to the outside of the gas- A second expansion valve 56 for selectively expanding the refrigerant supplied to the evaporator 60 and a second expansion valve 56 installed in parallel with the second expansion valve 56, The outlet side of the outdoor heat exchanger (48) and the inlet side of the accumulator (62) The second comprises a bypass valve 58 which coupled to.

1, reference numeral 10 denotes an air conditioning case in which the indoor heat exchanger 32 and the evaporator 60 are installed, 12 denotes a temperature control door for controlling the mixing amount of cool air and warm air, 20 denotes an inlet of the air conditioner case Respectively.

The first bypass valve 36 and the second expansion valve 56 are closed and the first expansion valve (heating mode) 34 and the second bypass valve 58 are opened. In addition, the temperature control door 12 operates as shown in Fig. Therefore, the refrigerant discharged from the compressor 30 passes through the indoor heat exchanger 32, the first expansion valve 34, the outdoor heat exchanger 48, the second bypass valve 58 and the accumulator 62 in order, (30). That is, the indoor heat exchanger 32 serves as a radiator, and the outdoor heat exchanger serves as an evaporator.

When the air conditioning mode (cooling mode) is activated, the first bypass valve 36 and the second expansion valve 56 are opened, and the first expansion valve 34 and the second bypass valve 58 are closed do. In addition, the temperature control door 12 closes the passage of the indoor heat exchanger 32. Therefore, the refrigerant discharged from the compressor 30 flows through the indoor heat exchanger 32, the first bypass valve 36, the outdoor heat exchanger 48, the second expansion valve 56, the evaporator 60, the accumulator 62 To the compressor 30 in this order. That is, the evaporator 60 functions as an evaporator, and the indoor heat exchanger 32, which is closed by the temperature control door 12, functions as a heater as in the heat pump mode.

However, in the conventional vehicular heat pump system, the indoor heat exchanger 32 is used as a heat source for heating by introducing high-temperature refrigerant from the compressor 30. At this time, heat exchange with air flowing in the air conditioning case 10 The subcooling of the indoor heat exchanger 32 is performed by the first expansion valve 34 and the subcooling of the indoor heat exchanger 32 by the first expansion valve 34, The refrigerant flow rate is decreased and the heat radiation performance of the outdoor heat exchanger 48 is decreased, so that there is a problem that the heating performance and efficiency are deteriorated as a whole.

In addition, when the refrigerant under the insufficient supercooling condition passes through the first expansion valve (34), the refrigerant flowed into the room due to the gaseous refrigerant that has not been liquefied and flows into the room, thus complaining consumers about the quietness to be.

According to an aspect of the present invention, there is provided a heat pump system including a compressor, an indoor heat exchanger, an outdoor heat exchanger, and an evaporator, wherein the refrigerant is circulated through the refrigerant circulation line on the outlet side of the indoor heat exchanger, And an internal heat exchanger for exchanging heat between the refrigerant discharged from the indoor heat exchanger and the waste heat of the vehicle electrical equipment, thereby increasing the subcooling of the refrigerant discharged from the indoor heat exchanger, thereby reducing refrigerant flow noise, The heat radiation performance of the outdoor heat exchanger is increased to increase the heating performance and efficiency as a whole. In addition, in the heat pump mode, waste heat is firstly recovered from the vehicle electrical product, and in the internal heat exchanger, And then flows through the first bypass line in the heat supply means provided in the first bypass line By heat exchange with the refrigerant of the on-vehicle to provide a heat pump system which can further improve the heating performance and efficiency.

According to an aspect of the present invention, there is provided a refrigeration system comprising: a compressor installed on a refrigerant circulation line for compressing and discharging a refrigerant; and a heat exchanger installed inside the air conditioner case for exchanging heat between the air in the air conditioning case and the refrigerant discharged from the compressor, An evaporator provided inside the air conditioning case for exchanging heat between the air in the air conditioning case and the refrigerant supplied to the compressor, and a heat exchanger installed outside the air conditioning case for exchanging heat between the refrigerant circulating through the refrigerant circulation line and the outside air A first expansion means provided on a refrigerant circulation line between the indoor heat exchanger and the outdoor heat exchanger for expanding the refrigerant; a second expansion means provided on the refrigerant circulation line at the inlet side of the evaporator for expanding the refrigerant; And a refrigerant circulation passage for circulating refrigerant in the outdoor heat exchanger, An internal heat exchanger for exchanging heat between the refrigerant discharged from the indoor heat exchanger and the waste heat of the vehicle electrical equipment is provided to increase the subcooling of the refrigerant discharged from the indoor heat exchanger to increase the heating performance .

In a heat pump system in which refrigerant circulates through a compressor, an indoor heat exchanger, an outdoor heat exchanger, and an evaporator, refrigerant discharged from the indoor heat exchanger and refrigerant discharged from the vehicle electrical equipment The subcooling of the refrigerant discharged from the indoor heat exchanger is increased to increase the flow rate of the refrigerant. As a result, the heat radiation performance of the outdoor heat exchanger is increased, The efficiency can be increased.

In the heat pump mode, the waste heat is firstly recovered from the vehicle electrical equipment, and the residual heat of the refrigerant at the outlet of the indoor heat exchanger is recovered in the secondary heat exchanger, and then the first bypass line flows through the first bypass line The heating performance and efficiency can be further enhanced by exchanging heat with the low-temperature refrigerant.

The refrigerant discharged from the indoor heat exchanger is heat-exchanged with the cooling water circulating in the vehicle electrical component and subcooled with a liquid refrigerant at an intermediate temperature, thereby preventing refrigerant flow noise during the passage through the first expansion means, Can be solved.

1 is a schematic view showing a conventional heat pump system for a vehicle,
FIG. 2 is a diagram showing an air conditioner mode in a heat pump system for a vehicle according to the present invention,
3 is a view showing a first heating mode of a heat pump mode in a vehicle heat pump system according to the present invention;
4 is a view showing a dehumidifying mode during a first heating mode operation of a heat pump mode in a vehicle heat pump system according to the present invention;
5 is a view showing a second heating mode of the heat pump mode in the vehicle heat pump system according to the present invention;
6 is a view showing a dehumidifying mode during the second heating mode operation of the heat pump mode in the vehicle heat pump system according to the present invention;
7 is a cross-sectional view showing an internal heat exchanger in a heat pump system for a vehicle according to the present invention.

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

The heat pump system for a vehicle according to the present invention includes a compressor 100, an indoor heat exchanger 110, a first expansion device 120, an outdoor heat exchanger 130, The second expansion means 140, and the evaporator 160, which are sequentially connected to each other, and is preferably applied to an electric vehicle or a hybrid vehicle.

A first bypass line R1 for bypassing the second expansion means 140 and the evaporator 160 and a second bypass line R1 for bypassing the outdoor heat exchanger 130 are provided on the refrigerant circulation line R. [ A second bypass line R2 and an expansion line R3 in which the first expansion means 120 is installed are connected in parallel to each other and a branch point of the first bypass line R1 is connected to a first direction switching valve A second direction switch valve 192 is provided at a branch point of the second bypass line R2 and a third switch valve 193 is provided at a branch point of the expansion line R3. Is installed.

A branch line R4 is provided to connect the first bypass line R1 to the inlet side refrigerant circulation line R of the evaporator 160 and an on-off valve 195 Is installed.

2, the refrigerant discharged from the compressor 100 flows through the indoor heat exchanger 110, the outdoor heat exchanger 130, the second expansion means 140, the evaporator 160, the compressor The indoor heat exchanger 110 serves as a condenser and the evaporator 160 serves as an evaporator.

Meanwhile, the outdoor heat exchanger 130 functions as a condenser as the indoor heat exchanger 110.

3, the refrigerant discharged from the compressor 100 is supplied to the indoor heat exchanger 110, the first expansion device 120, the outdoor heat exchanger 130, and the outdoor heat exchanger 130. In the heat pump mode (first heating mode) 1 bypass line R1 and the compressor 100. The indoor heat exchanger 110 serves as a condenser and the outdoor heat exchanger 130 serves as an evaporator, 2 Refrigerant is not supplied to the expansion means (140) and the evaporator (160).

As described above, the heat pump system of the present invention can share the refrigerant circulation line R with the same refrigerant circulation direction in the air conditioner mode and the heat pump mode, prevents the refrigerant stagnation phenomenon that occurs when the refrigerant does not flow, The circulation line (R) can also be simplified.

Hereinafter, each component of the heat pump system will be described in detail.

First, the compressor 100 installed on the refrigerant circulation line R receives power from an engine (an internal combustion engine, a motor, or the like), sucks the refrigerant, compresses the refrigerant, and discharges the compressed refrigerant in a gas state of high temperature and high pressure.

The compressor 100 sucks and compresses the refrigerant discharged from the evaporator 160 in the air conditioning mode and supplies the compressed refrigerant to the indoor heat exchanger 110. In the heat pump mode, The refrigerant having passed through the first bypass line R1 is sucked, compressed, and supplied to the indoor heat exchanger 110 side.

In the dehumidifying mode of the heat pump mode, since the refrigerant is simultaneously supplied to the first bypass line (R1) and the evaporator (160) through the branch line (R4) described later, the compressor (100) 1 bypass line R1 and the evaporator 160, sucks the combined refrigerant, compresses it, and supplies it to the indoor heat exchanger 110 side.

The indoor heat exchanger 110 is installed inside the air conditioning case 150 and is connected to the refrigerant circulation line R at the outlet side of the compressor 100 and is connected to the air flowing in the air conditioning case 150 Temperature refrigerant discharged from the compressor 100 is heat-exchanged.

The evaporator 160 is installed inside the air conditioning case 150 and is connected to the refrigerant circulation line R at the inlet side of the compressor 100 so that the air flowing in the air conditioning case 150 And the refrigerant supplied to the compressor 100 is heat-exchanged.

The indoor heat exchanger 110 functions as a condenser in both the air conditioning mode and the heat pump mode,

The evaporator 160 serves as an evaporator in the air conditioning mode, and stops operating because the refrigerant can not be supplied during the first and second heating modes of the heat pump mode. In the dehumidifying mode, a part of the refrigerant is supplied to serve as an evaporator do.

The indoor heat exchanger 110 and the evaporator 160 are installed in the air conditioner case 150 at a predetermined distance from the air conditioner case 150, And an indoor heat exchanger 110 are sequentially installed.

2, the low-temperature and low-pressure refrigerant discharged from the second expansion means 140 is supplied to the evaporator 160. At this time, the blower (not shown) Air flowing through the air conditioning case 150 through the evaporator 160 is exchanged with the low temperature low pressure refrigerant in the evaporator 160 to be converted into cool air and then discharged to the vehicle interior The inside of the car is cooled.

3, the high-temperature and high-pressure refrigerant discharged from the compressor 100 is supplied to the indoor heat exchanger 110 and the refrigerant discharged from the outdoor heat exchanger 110 to the indoor heat exchanger 110. In the heat pump mode (first heating mode) in which the indoor heat exchanger 110 functions as a condenser, The air flowing inside the air conditioning case 150 through the blower (not shown) flows through the indoor heat exchanger 110, and the refrigerant in the indoor heat exchanger 110 is heat- And then it is discharged to the inside of the vehicle to heat the inside of the vehicle.

The size of the evaporator 160 may be larger than the size of the indoor heat exchanger 110.

The amount of air passing through the indoor heat exchanger 110 and the amount of air passing through the indoor heat exchanger 110 are adjusted between the evaporator 160 and the indoor heat exchanger 110 in the air conditioning case 150 A temperature control door 151 is provided.

The temperature control door 151 adjusts the amount of air passing through the indoor heat exchanger 110 and the amount of air passing through the indoor heat exchanger 110 to control the temperature of the air discharged from the air conditioning case 150 Can be adjusted appropriately,

2, when the front side passageway of the indoor heat exchanger 110 is completely closed through the temperature control door 151 as shown in FIG. 2, the cold air passing through the evaporator 160 passes through the indoor heat exchanger 110, The indoor heat exchanger 110 is bypassed through the temperature control door 151 as shown in FIG. 3 during the heat pump mode (in the first heating mode) All the air passes through the indoor heat exchanger 110 serving as a condenser and is converted into warm air, and the warm air is supplied to the interior of the vehicle, so that the maximum heating is performed.

The outdoor heat exchanger 130 is installed outside the air conditioning case 150 and is connected to the refrigerant circulation line R to exchange heat between the refrigerant circulating in the refrigerant circulation line R and the outside air do.

The outdoor heat exchanger 130 is installed on the front side of the vehicle engine room to exchange heat with refrigerant flowing in the outdoor space.

The outdoor heat exchanger 130 functions as the same condenser as the indoor heat exchanger 110 in the air conditioning mode. At this time, the high-temperature refrigerant flowing in the outdoor heat exchanger 130 is condensed while exchanging heat with the outside air . In the heat pump mode (first heating mode), the refrigerant acts as an evaporator opposite to the indoor heat exchanger 110. At this time, the low-temperature refrigerant flowing in the outdoor heat exchanger 130 is evaporated as heat is exchanged with the outside air do.

The first expansion means 120 is installed on the refrigerant circulation line R between the indoor heat exchanger 110 and the outdoor heat exchanger 130 and is connected to the outdoor heat exchanger 130 in accordance with the air conditioning mode or the heat pump mode. Thereby selectively expanding the refrigerant supplied to the compressor 130.

The first expansion means 120 is installed on the expansion line R3 connected in parallel on the refrigerant circulation line R between the indoor heat exchanger 110 and the outdoor heat exchanger 130. [

Here, the first expansion means 120 may be an orifice 121, but it may be an expansion valve.

The refrigerant that has passed through the indoor heat exchanger 110 according to the air conditioning mode or the heat pump mode is supplied to the branch line between the expansion line R3 and the refrigerant circulation line R through the expansion line R3, A third direction switching valve 193 for switching the refrigerant flow direction to pass through the expansion means 120 or bypass the first expansion means 120 is provided.

Therefore, in the air conditioning mode, the refrigerant discharged from the compressor 100 and passed through the indoor heat exchanger 110 bypasses the first expansion means 120 by the third direction switching valve 193 The refrigerant discharged from the compressor 100 and passed through the indoor heat exchanger 110 is supplied to the outdoor heat exchanger 130 through the third direction switching valve 130. In the heat pump mode, 193 to the outdoor heat exchanger 130 after passing through the expansion line R 3 and the first expansion means 120.

The second expansion means 140 is installed on the refrigerant circulation line R on the inlet side of the evaporator 160 and expands the refrigerant supplied to the evaporator 160.

That is, the second expansion means 140 causes the refrigerant discharged from the outdoor heat exchanger 130 to expand into a low-temperature and low-pressure liquid (frothed) state in the air conditioning mode, and then supplied to the evaporator 160 .

The second expansion means 140 may be an expansion valve, but it may be an orifice.

The first bypass line R1 is installed to connect the inlet side refrigerant circulation line R of the second expansion means 140 and the outlet side refrigerant circulation line R of the evaporator 160 , And the refrigerant circulating through the refrigerant circulation line (R) selectively bypasses the second expansion means (140) and the evaporator (160).

As shown in the figure, the first bypass line R1 is disposed in parallel with the second expansion means 140 and the evaporator 160, that is, the inlet side of the first bypass line R1 is connected to the outdoor Is connected to the refrigerant circulation line R connecting the heat exchanger 130 and the second expansion means 140 and the outlet side is connected to the refrigerant circulation line R connecting the evaporator 160 and the compressor 100 .

The refrigerant that has passed through the outdoor heat exchanger 130 flows toward the second expansion means 140 and the evaporator 160 in the air conditioner mode. However, in the heat pump mode (during the first heating mode) The refrigerant that has passed through the outdoor heat exchanger 130 flows directly to the compressor 100 through the first bypass line R 1 and bypasses the second expansion means 140 and the evaporator 160.

Here, the function of switching the flow direction of the refrigerant according to the air conditioner mode and the heat pump mode is performed through the first direction switching valve 191.

The first direction switching valve 191 is installed at a branch point between the first bypass line Rl and the refrigerant circulation line R and is connected to the outdoor heat exchanger 130 according to an air conditioning mode or a heat pump mode. The refrigerant flow direction is switched so that the refrigerant passing through the first bypass line (R1) or the second expansion means (140) flows.

At this time, the first directional control valve 191 controls the refrigerant discharged from the compressor 100 in the air conditioning mode and passed through the indoor heat exchanger 110 and the outdoor heat exchanger 130 to flow through the second expansion means 140, The refrigerant discharged from the compressor 100 flows through the indoor heat exchanger 110 and the first expansion means 120 and the outdoor heat exchanger 120. In the first heating mode, So that the refrigerant passing through the first bypass line (130) flows in the first bypass line (R1).

Meanwhile, the first directional control valve 191 is provided at a branch point on the inlet side of the first bypass line R1, and it is preferable to use a three-way valve.

It is preferable that not only the first direction switching valve 191 but also the second direction switching valve 192 and the third direction switching valve 193 use a three-way valve.

On the first bypass line R1, a heat supply means 180 for supplying heat to the refrigerant flowing along the first bypass line R1 is installed.

The heat supply unit 180 is connected to the first bypass line Rl so that waste heat of the vehicle electrical product 200 can be supplied to the refrigerant flowing through the first bypass line R1, And a cooling water heat exchanger 181b which is provided at one side of the refrigerant heat exchanger 181a and through which the cooling water recovered from the waste heat is circulated while circulating the vehicle electrical product 200, 181).

Therefore, the heating performance can be improved by recovering the heat source from the waste heat of the vehicle electrical equipment 200 in the heat pump mode.

The vehicle electrical component 200 may be connected to the cooling water heat exchanger 181b of the heat supply unit 180 through a cooling water circulation line W. The vehicle electrical component 200 may include a motor, do.

The inlet side first bypass line (R1) of the heat supply means (180) is connected to the evaporator (160) to supply a part of the refrigerant flowing toward the heat supply means (180) along the first bypass line (R1) Off valve 195 is provided on the branch line R4 for controlling the flow of the refrigerant on / off, and a branch line R4 for connecting the inlet side refrigerant circulation line R of the evaporator 160 .

The on-off valve 195 is opened in the vehicle interior dehumidifying mode, so that some of the refrigerant flowing toward the first bypass line R1 by the first direction switching valve 191 passes through the water-cooled heat exchanger 181 The waste heat of the vehicle electrical component 200 is recovered and a part thereof passes through the evaporator 160 through the branch line R4.

Accordingly, the air flowing inside the air conditioning case 150 is dehumidified while passing through the evaporator 160, that is, during the heat pump mode operation such as the first and second heating modes, the branch line R4 ) Can perform dehumidification in the car interior.

An accumulator 170 is installed on the refrigerant circulation line R on the inlet side of the compressor 100.

The accumulator 170 separates the liquid refrigerant and the gaseous refrigerant from the refrigerant supplied to the compressor 100 so that only the gaseous refrigerant can be supplied to the compressor 100.

An electric heater 115 is further installed on the downstream side of the indoor heat exchanger 110 in the air conditioning case 150 to improve the heating performance.

That is, the heating performance can be improved by operating the electric heating type heater 115 as an auxiliary heat source at the start of the vehicle, and even when the heating heat source is insufficient at a low temperature (-10 ° C. or less), the electric heating type heater ) Can be used.

As the electric heater 115, a PTC heater is preferably used.

The second bypass line R2 is installed in parallel in the refrigerant circulation line R so that the refrigerant selectively passing through the first expansion means 120 bypasses the outdoor heat exchanger 130, That is, the second bypass line R2 is provided to connect the inlet side refrigerant circulation line R and the outlet side refrigerant circulation line R of the outdoor heat exchanger 130, and the refrigerant circulation line R So that the circulating refrigerant bypasses the outdoor heat exchanger 130.

A second direction switching valve 192 is provided for switching the flow direction of the refrigerant so that the refrigerant circulating through the refrigerant circulation line R flows selectively to the second bypass line R2. The directional control valve 192 is installed at a branch point between the second bypass line R2 and the refrigerant circulation line R so that the refrigerant flows into the outdoor heat exchanger 130 or the second bypass line R2 The flow direction of the refrigerant is switched to flow.

An internal heat exchanger 250 for exchanging heat between the refrigerant discharged from the indoor heat exchanger 110 and the waste heat of the vehicle electrical equipment 200 is installed on the refrigerant circulation line R on the outlet side of the indoor heat exchanger 110 .

That is, the internal heat exchanger 250 is installed on the refrigerant circulation line R between the indoor heat exchanger 110 and the first expansion means 120.

The internal heat exchanger 250 may be a double pipe or a plate heat exchanger for exchanging heat between the refrigerant discharged from the indoor heat exchanger 110 and the cooling water recovered from the vehicle electrical product 200 while passing through the vehicle electrical product 200.

7, an inner pipe 251 through which refrigerant discharged from the indoor heat exchanger 110 flows, and an inner pipe 251 through which the refrigerant discharged from the indoor heat exchanger 110 flows, And the outer tube 252 through which the cooling water circulating while recovering the waste heat flows is constructed as a double tube structure.

The outer tube 252 is formed concentrically with the inner tube 251 and has a diameter larger than that of the inner tube 251 so as to be inserted into the space between the inner tube 251 and the outer tube 252, The cooling water circulating through the cooling water passage 200 flows.

The inner pipe 251 may use a part of the refrigerant circulation line R on the outlet side of the indoor heat exchanger 110 as the inner pipe 251.

The electric component 200, the internal heat exchanger 250, and the heat supply unit (not shown) are connected to the internal electrical heat exchanger 250 and the heat supply unit 180 so as to circulate the cooling water, 200 are connected to each other.

That is, the cooling water, which has recovered the waste heat while passing through the vehicle electrical component 200, flows into the internal heat exchanger 250, exchanges heat with the refrigerant discharged from the indoor heat exchanger 110, and the refrigerant discharged from the indoor heat exchanger 110 Cooling of the indoor heat exchanger 110 is then recovered and then the refrigerant is introduced into the cooling water heat exchanger 181b of the heat supply unit 180, After supplying the residual heat of the electric component 200 waste heat and the outlet refrigerant of the indoor heat exchanger 110 to the low temperature refrigerant flowing through the first bypass line R1 by heat exchange with the low temperature refrigerant flowing through the first bypass line R1, 200).

On the other hand, an electric water pump (not shown) is installed on the cooling water circulation line W to control the flow rate of the cooling water circulating through the cooling water circulation line W.

As described above, the present invention is a high-efficiency system for recovering waste heat in a vehicle electrical product (200) in a first heat pump mode and recovering residual heat of an outlet refrigerant in an indoor heat exchanger (110) in the internal heat exchanger (250) The cooling water recovered through the second heat is finally supplied to the heat supply unit 180 to heat-exchange the refrigerant with the low-temperature refrigerant flowing through the first bypass line R1, thereby recovering the waste heat in the heat pump system , Which can further enhance the heating performance and efficiency.

In addition, the refrigerant discharged from the indoor heat exchanger 110 is heat-exchanged with the cooling water circulating in the vehicle electrical equipment 200, and cooled by the middle-temperature liquid refrigerant, thereby increasing the subcooling to increase the refrigerant flow rate, As a result, the heat radiation performance of the outdoor heat exchanger 130 is increased, so that the heating performance and efficiency as a whole can be increased.

In addition, since the refrigerant discharged from the indoor heat exchanger 110 is heat-exchanged with the cooling water circulating through the vehicle electrical equipment 200 and sufficiently cooled by the liquid refrigerant, It is possible to eliminate the complaint of the consumer about the quietness by preventing the flow noise.

Hereinafter, the operation of the vehicle heat pump system according to the present invention will be described.

end. Air conditioning mode (cooling mode) (Fig. 2)

2, the second bypass line R2 is closed through the second direction switching valve 192, and the second bypass line R2 is closed through the first direction switching valve 191, 1 bypass line R1 is also closed, and the third direction switching valve 193 closes the expansion line R3.

The cooling water circulating through the electrical component (200) is not supplied to the water heat exchanger (181) of the internal heat exchanger (250) and the heat supply unit (180). That is, although not shown in detail in the drawing, the cooling water is controlled to circulate only the electric component 200, and the flow direction of the cooling water is controlled so that the cooling water does not flow into the internal heat exchanger 250 and the heat supply unit 180.

On the other hand, at the time of maximum cooling, the temperature control door 151 in the air conditioning case 150 is operated to close the passage through the indoor heat exchanger 110, so that the air blown into the air conditioning case 150 by the blower Is cooled while passing through the evaporator (160), and is then supplied to the interior of the vehicle by bypassing the indoor heat exchanger (110), thereby cooling the interior of the vehicle.

Next, the refrigerant circulation process will be described.

The high-temperature, high-pressure gaseous refrigerant discharged from the compressor 100 after being compressed is supplied to the indoor heat exchanger 110 installed in the air conditioning case 150.

The refrigerant supplied to the indoor heat exchanger 110 is supplied to the outdoor heat exchanger 130 without heat exchange with air because the temperature control door 151 closes the passage on the indoor heat exchanger 110 as shown in FIG. .

The refrigerant flowing into the outdoor heat exchanger 130 is condensed while exchanging heat with the outside air, thereby changing the gaseous refrigerant into the liquid refrigerant.

Meanwhile, both the indoor heat exchanger 110 and the outdoor heat exchanger 130 serve as a condenser, but the refrigerant mainly condenses in the outdoor heat exchanger 130, which exchanges heat with outside air.

Subsequently, the refrigerant passing through the outdoor heat exchanger 130 is decompressed and expanded in the process of passing through the second expansion means 140 to be a low-temperature low-pressure liquid-phase refrigerant, and then flows into the evaporator 160.

The refrigerant flowing into the evaporator 160 is heat-exchanged with the air blown into the air conditioning case 150 through the blower to evaporate, and at the same time, the air is cooled by an endothermic effect due to the latent heat of evaporation of the refrigerant. And supplied to the vehicle interior to be cooled.

Then, the refrigerant discharged from the evaporator 160 flows into the compressor 100 and recycles the cycle as described above.

I. In the first heating mode (FIG. 3) of the heat pump mode,

The first heating mode of the heat pump mode operates when the temperature of the outside air temperature of the vehicle is equal to or higher than a predetermined temperature (for example, 0 占 폚) and flows through the second bypass line 192 R2 is closed and the first bypass line R1 is opened through the first direction switching valve 191 so that no refrigerant is supplied to the second expansion means 140 and the evaporator 160 side .

Further, the expansion line (R3) is opened through the third direction switching valve (193).

On the other hand, the cooling water heated by the vehicle electrical component 200 circulates through the cooling water heat exchanger 181b of the water-cooled heat exchanger 181, which is the internal heat exchanger 250 and the heat supply means 180.

In the first heating mode, the temperature control door 151 in the air conditioning case 150 is operated to close the passage bypassing the indoor heat exchanger 110, and is blown into the air conditioning case 150 by the blower Air passes through the evaporator 160 (operation stop), passes through the indoor heat exchanger 110, and is converted into hot air to be supplied to the interior of the vehicle, thereby heating the interior of the vehicle.

Next, the refrigerant circulation process will be described.

The high-temperature, high-pressure gaseous refrigerant discharged from the compressor 100 after being compressed is introduced into the indoor heat exchanger 110 installed inside the air conditioning case 150.

The high-temperature, high-pressure gaseous refrigerant introduced into the indoor heat exchanger 110 is condensed while exchanging heat with the air blown into the air conditioning case 150 through the blower. At this time, air passing through the indoor heat exchanger 110 After changing to hot air, it is supplied to the interior of the vehicle, and the interior of the vehicle is heated.

Subsequently, the refrigerant discharged from the indoor heat exchanger (110) undergoes heat exchange with the cooling water circulating through the electric component (200) while being passed through the internal heat exchanger (250), and the cooling water is recovered from the refrigerant. The refrigerant then flows into the expansion line R3 through the third direction switching valve 193 and the refrigerant flowing into the expansion line R3 flows through the first expansion means 120 Pressure refrigerant, and then supplied to the outdoor heat exchanger 130 serving as an evaporator.

The refrigerant supplied to the outdoor heat exchanger 130 is evaporated while exchanging heat with the outside air and is then passed through the first bypass line R1 by the first direction switching valve 191. At this time, The refrigerant passing through the line R1 is heat-exchanged with the cooling water passing through the cooling water heat exchanger 181b in the process of passing through the refrigerant heat exchanger 181a of the water-cooled heat exchanger 181, After recovering the residual heat of the refrigerant and the waste heat of the vehicle electrical equipment 200, it flows into the compressor 100 and recirculates the cycle as described above.

All. In the first heating mode of the heat pump mode (Fig. 4)

The dehumidification mode during the first heating mode operation of the heat pump mode is activated when the room dehumidification is required during operation in the first heating mode of FIG.

Therefore, only the portions different from the first heating mode of FIG. 3 will be described.

During the dehumidification mode, the branch line R4 is further opened through the on-off valve 195 in the first heating mode.

In the dehumidifying mode, the temperature control door 151 in the air conditioning case 150 is operated to close the passage bypassing the indoor heat exchanger 110, so that the air blown into the air conditioning case 150 by the blower After passing through the evaporator 160, the refrigerant passes through the indoor heat exchanger 110 and is converted into hot air to be supplied to the interior of the vehicle, thereby heating the interior of the vehicle.

At this time, since the amount of the refrigerant supplied to the evaporator 160 is small, the air cooling performance is low, so that the change in the room temperature is minimized, and the air passing through the evaporator 160 is dehumidified smoothly.

Next, the refrigerant circulation process will be described.

The refrigerant that has passed through the compressor 100, the indoor heat exchanger 110, the internal heat exchanger 250, the first expansion device 120, and the outdoor heat exchanger 130 is cooled by the first direction switching valve 191 One of the refrigerant passing through the first bypass line R1 passes through the refrigerant heat exchanger 181a of the water-cooled heat exchanger 181, Exchanges heat with the cooling water passing through the heat exchanging part 181b and evaporates while recovering the residual heat of the refrigerant at the outlet of the indoor heat exchanger 110 and the waste heat of the vehicle electrical equipment 200. A part of the evaporated water is evaporated through the branch line R4 And evaporates in the course of heat exchange with the air flowing inside the air conditioning case 150.

In this process, the air passing through the evaporator 160 is dehumidified, and the dehumidified air passing through the evaporator 160 is converted into hot air while passing through the indoor heat exchanger 110, Dehumidification is heated.

Then, the refrigerant having passed through the water-cooled heat exchanger 181 and the evaporator 160 is combined and then flows into the compressor 100, and recycles the cycle as described above.

la. In the second heating mode of the heat pump mode (Fig. 5)

The second heating mode of the heat pump mode operates when the outside temperature of the vehicle is less than a predetermined temperature (for example, 0 占 폚), and the second bypass line (R2) is opened, and the first bypass line (R1) is opened through the first direction switching valve (191).

In addition, the branch line R4 is closed through the on-off valve 195, the expansion line R3 is opened through the third direction switching valve 193, And the mode is switched to the air intake mode so as to introduce air.

On the other hand, the cooling water heated by the vehicle electrical component 200 is circulated to the internal heat exchanger 250 and the cooling water heat exchanger 181b of the water-cooled heat exchanger 181, which is the heat supply means 180.

In the second heating mode, the temperature control door 151 in the air conditioning case 150 is operated to close the passage bypassing the indoor heat exchanger 110, so that air is blown into the air conditioning case 150 by the blower Air passes through the evaporator 160 (operation stop), passes through the indoor heat exchanger 110, and is converted into hot air to be supplied to the interior of the vehicle, thereby heating the interior of the vehicle.

Next, the refrigerant circulation process will be described.

The high-temperature, high-pressure gaseous refrigerant discharged from the compressor 100 after being compressed is introduced into the indoor heat exchanger 110 installed inside the air conditioning case 150.

The high-temperature, high-pressure gaseous refrigerant introduced into the indoor heat exchanger 110 is condensed while exchanging heat with the air blown into the air conditioning case 150 through the blower. At this time, air passing through the indoor heat exchanger 110 After changing to hot air, it is supplied to the interior of the vehicle, and the interior of the vehicle is heated.

Subsequently, the refrigerant discharged from the indoor heat exchanger (110) undergoes heat exchange with the cooling water circulating through the electric component (200) while being passed through the internal heat exchanger (250), and the cooling water is recovered from the refrigerant. The refrigerant then flows into the expansion line R3 through the third direction switching valve 193 and the refrigerant flowing into the expansion line R3 flows through the first expansion means 120 The refrigerant flows to the second bypass line (R2), and bypasses the outdoor heat exchanger (130).

Then, the refrigerant having passed through the second bypass line R2 passes through the first bypass line R1 by the first direction switching valve 191. At this time, the first bypass line R1 Exchanges heat with the cooling water passing through the cooling water heat exchanging part 181b in the course of passing through the refrigerant heat exchanging part 181a of the water-cooled heat exchanger 181, so that the residual heat of the refrigerant exiting the indoor heat exchanger 110 And recycles the cycle as described above while the waste heat of the vehicle electrical component 200 is recovered and evaporated, and then flows into the compressor 100.

hemp. In the second heating mode of the heat pump mode (Fig. 6)

The dehumidification mode of the second heating mode of the heat pump mode is operated when the room dehumidification is required during the operation of the second heating mode of Fig.

Therefore, only the parts different from the second heating mode in Fig. 5 will be described.

During the dehumidification mode, the branch line R4 is further opened through the on-off valve 195 in the second heating mode.

In the dehumidifying mode, the temperature control door 151 in the air conditioning case 150 is operated to close the passage bypassing the indoor heat exchanger 110, so that the air blown into the air conditioning case 150 by the blower After passing through the evaporator 160, the refrigerant passes through the indoor heat exchanger 110 and is converted into hot air to be supplied to the interior of the vehicle, thereby heating the interior of the vehicle.

At this time, since the amount of the refrigerant supplied to the evaporator 160 is small, the air cooling performance is low, so that the change in the room temperature is minimized, and the air passing through the evaporator 160 is dehumidified smoothly.

Next, the refrigerant circulation process will be described.

The refrigerant having passed through the compressor 100, the indoor heat exchanger 110, the internal heat exchanger 250, the first expansion device 120 and the second bypass line R2 is supplied to the first directional control valve 191 A part of the refrigerant passing through the first bypass line R 1 passes through the refrigerant heat exchanger 181 a of the water-cooled heat exchanger 181, Exchanges heat with the cooling water passing through the cooling water heat exchanging part 181b to recover the residual heat of the refrigerant at the outlet of the indoor heat exchanger 110 and the waste heat of the vehicle electrical equipment 200 while part of the heat is evaporated through the branch line R4, The air is supplied to the air conditioning case 160 and evaporated in the course of heat exchange with the air flowing inside the air conditioning case 150.

In this process, the air passing through the evaporator 160 is dehumidified, and the dehumidified air passing through the evaporator 160 is converted into hot air while passing through the indoor heat exchanger 110, Dehumidification is heated.

Then, the refrigerant having passed through the water-cooled heat exchanger 181 and the evaporator 160 is combined and then flows into the compressor 100, and recycles the cycle as described above.

100: compressor 110: indoor heat exchanger
115: Electric heater
120: first expansion means 121: orifice
130: outdoor heat exchanger 140: second expansion means
150: air conditioning case 151: temperature control door
160: Evaporator 170: Accumulator
180: Heat supply unit 181: Water-cooled heat exchanger
181a: refrigerant heat exchanger 181b: cooling water heat exchanger
191: first direction switching valve 192: second direction switching valve
193: third direction switching valve 195: on-off valve
200: Electrical products 250: Internal heat exchanger
251: Inner tube 252: Outer tube
R: refrigerant circulation line R1: first bypass line
R2: second bypass line R3: inflation line
R4: Branch line W: Cooling water circulation line

Claims (5)

The compressor 100 is installed in the refrigerant circulation line R and compresses and discharges the refrigerant. The compressor 100 is installed inside the air conditioning case 150 and discharges air in the air conditioning case 150 and the air discharged from the compressor 100 An evaporator 160 installed inside the air conditioner case 150 for exchanging heat between the air in the air conditioner case 150 and the refrigerant supplied to the compressor 100, An outdoor heat exchanger 130 installed outside the air conditioning case 150 for exchanging heat between the refrigerant circulating in the refrigerant circulation line R and the outside air and an outdoor heat exchanger 130 installed between the indoor heat exchanger 110 and the outdoor heat exchanger 130 A first expansion means 120 installed on the refrigerant circulation line R for expanding the refrigerant and a second expansion means provided on the inlet side refrigerant circulation line R of the evaporator 160 for expanding the refrigerant 140), the heat pump system comprising:
An internal heat exchanger 250 for exchanging heat between the refrigerant discharged from the indoor heat exchanger 110 and the waste heat of the vehicle electrical equipment 200 is installed on the refrigerant circulation line R on the outlet side of the indoor heat exchanger 110, And the subcooling of the refrigerant discharged from the indoor heat exchanger (110) is increased to increase the heating performance and efficiency. The method according to claim 1,
The internal heat exchanger 250 includes an inner pipe 251 through which the refrigerant discharged from the indoor heat exchanger 110 flows and an outer pipe 252 through which the cooling water recovered from the waste electrical heat circulates while flowing through the vehicle electrical product 200 ) Is constructed as a double pipe structure. The method according to claim 1,
The second expansion means 140 (140) is installed on the refrigerant circulation line (R) so that the refrigerant circulating through the refrigerant circulation line (R) in the heat pump mode bypasses the second expansion means 140 and the evaporator And a first bypass line R1 connecting the refrigerant circulation line R on the inlet side of the evaporator 160 and the refrigerant circulation line R on the outlet side of the evaporator 160,
And a heat supply means (180) for supplying waste heat of the vehicle electrical equipment (200) to the refrigerant flowing along the first bypass line (R1) is provided on the first bypass line (R1) system. The method of claim 3,
The heat supply unit 180 includes a refrigerant heat exchanging unit 181a through which the refrigerant flowing through the first bypass line R1 flows and a refrigerant heat exchanging unit 181a provided at one side of the refrigerant heat exchanging unit 181a, And a cooling water heat exchanger (181b) through which cooling water circulating through the cooling water heat exchanger (200) flows. The method of claim 3,
The heat pump system is connected to the electric component 200, the internal heat exchanger 250, and the heat supply unit (not shown) so that the cooling water circulating the vehicle electrical component 200 is circulated via the internal heat exchanger 250 and the heat supply unit 180 180 are connected to the cooling water circulation line W,
The cooling water circulating in the cooling water circulation line W collects the waste heat of the electrical component 200 from the vehicle electrical component 200 in the first heat pump mode and the heat from the indoor heat exchanger 110 And the cooling water recovered from the first and second heat is supplied to the heat supply unit 180 to heat-exchange the refrigerant with the refrigerant flowing through the first bypass line R1 The heat pump system for vehicles.

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