KR101342933B1 - Heat pump system for vehicle - Google Patents

Abstract

The present invention relates to a vehicle heat pump system, and more particularly, to an outdoor evaporator side refrigerant circulated by a first compressor in a heat pump mode by connecting two compressors in parallel, and branching the circulating refrigerant into a second refrigerant. By exchanging heat between the outdoor condenser side circulating by the compressor to ensure the necessary heat source in the heat pump mode, it is possible to operate the heat pump mode smoothly by securing the heat source through two compressors even under low ambient temperature. Of course, the present invention relates to a heat pump system for a vehicle that can improve heating performance and reduce the number of components and cost by simplifying the configuration of the whole system.

Description

[0001] Heat pump system for vehicle [0002]

The present invention relates to a vehicle heat pump system, and more particularly, to an outdoor evaporator side refrigerant circulated by a first compressor in a heat pump mode by connecting two compressors in parallel, and branching the circulating refrigerant into a second refrigerant. By exchanging heat between the outdoor condenser side circulating by the compressor to ensure the necessary heat source in the heat pump mode, it is possible to operate the heat pump mode smoothly by securing the heat source through two compressors even under low ambient temperature. Of course, the present invention relates to a heat pump system for a vehicle that can improve heating performance and reduce the number of components and cost by simplifying the configuration of the whole system.

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.

On the other hand, in addition to the vehicle air conditioner, a heat pump system capable of selectively performing cooling and heating by changing the flow direction of the refrigerant using one refrigerant cycle is applied, for example, two heat exchangers. (Ie, an indoor heat exchanger installed in the air conditioning case to exchange heat with air blown into the vehicle interior, and an outdoor heat exchanger configured to exchange heat from the outside of the air conditioning case), and at least one direction control capable of changing the flow direction of the refrigerant With a valve. Therefore, when the cooling mode is operated according to the flow direction of the refrigerant by the direction control valve, the indoor heat exchanger functions as a cooling heat exchanger. When the heating mode is activated, the indoor heat exchanger functions as a heating heat exchanger .

Various types have been proposed as such a vehicle heat pump system, and those disclosed in the representative Japanese Patent Laid-Open No. 2001-27455 are mentioned.

As shown in FIG. 1, the vehicle heat pump system includes a compressor 30 for compressing and discharging a refrigerant, a high pressure side heat exchanger 32 for dissipating the refrigerant discharged from the compressor 30, and a parallel structure. A first expansion valve 34 and a first bypass valve 36 and a first expansion valve 34 or a first bypass to selectively pass the refrigerant passing through the high-pressure side heat exchanger 32; The outdoor unit 48 for heat-exchanging the refrigerant passing through the pass valve 36 outdoors, the low pressure side heat exchanger 60 for evaporating the refrigerant passing through the outdoor unit 48, and the low pressure side heat exchanger 60 An accumulator 62 for separating the refrigerant passing through the gaseous phase and the liquid phase refrigerant, an internal heat exchanger 50 for heat-exchanging the refrigerant supplied to the low pressure side heat exchanger 60, and the refrigerant returned to the compressor 30. And selectively expand the refrigerant supplied to the low pressure side heat exchanger (60). The second expansion valve 56 to be opened, and the second bypass valve is installed in parallel with the second expansion valve 56 to selectively connect the outlet side of the outdoor unit 48 and the inlet side of the accumulator 62. And pass valve 58.

1, reference numeral 10 denotes an air conditioning case in which the high-pressure side heat exchanger 32 and the low-pressure side heat exchanger 60 are incorporated, reference numeral 12 denotes a temperature control door for controlling the mixing amount of cold air and warm air, And an air blower installed at the entrance of the air conditioning case.

According to the conventional vehicle heat pump system configured as described above, when the heating mode is operated, the first bypass valve 36 and the second expansion valve 56 are closed, and the first expansion valve 34 and the second expansion valve 56 are closed. Bypass valve 58 is open. In addition, the temperature control door 12 operates as shown in Fig. Therefore, the refrigerant discharged from the compressor 30 flows through the high pressure side heat exchanger 32, the first expansion valve 34, the outdoor unit 48, the high pressure portion 52 of the internal heat exchanger 50, the second bypass valve 58 The accumulator 62 and the low pressure section 54 of the internal heat exchanger 50 in this order. That is, the high-pressure side heat exchanger 32 serves as a radiator, and the outdoor unit 48 serves as an evaporator.

However, in the conventional vehicle heat pump system, the high pressure side heat exchanger 32 installed inside the air conditioning case 10 serves as a heater in the heat pump mode (heating mode) to perform heating, and the outdoor unit ( 48 is installed outside the air conditioning case 10, that is, the engine room front side of the vehicle serves as an evaporator that exchanges heat with the outside,

At this time, in a condition where the outside air temperature is low, the outdoor unit 48 serving as the evaporator exchanges heat with cold outside, and thus it is impossible to supply sufficient waste heat to the high pressure side heat exchanger 32 serving as the heater. In Korea, there is a technical limitation that cannot be used in low temperature regions because heating performance is deteriorated or heat pump mode system cannot be operated without a heat source.

In addition, when a heater core (not shown) in which the coolant of the engine is circulated separately is installed in the air conditioning case 10 in order to solve the problem of poor performance or operation in a low outside temperature condition as described above. However, in this case, the configuration of the entire system is complicated and there are many components, which increase the weight and cost.

An object of the present invention for solving the above problems is to connect the two compressors in parallel to the outdoor evaporator side refrigerant circulated by the first compressor in the heat pump mode, the branched circulating refrigerant is circulated by the second compressor By exchanging the heat exchanger of the outdoor condenser on the outside to secure the heat source required in the heat pump mode, the heat pump mode can be operated smoothly by the two compressors even under low ambient temperature, as well as the heating performance. It is to provide a heat pump system for a vehicle that can improve the performance, and reduce the number of components and the cost by simplifying the configuration of the whole system.

The present invention for achieving the above object, the first compressor is installed on the refrigerant circulation line for compressing and discharging the refrigerant, is installed in the air conditioning case and connected to the refrigerant circulation line and discharged from the first compressor An indoor heat exchanger for exchanging the refrigerant with air flowing in the air conditioning case, first expansion means installed on the refrigerant circulation line to expand the refrigerant discharged from the indoor heat exchanger, and on the refrigerant circulation line. An outdoor evaporator installed to evaporate the refrigerant discharged from the first expansion means, and heat supply means for supplying heat to evaporate the refrigerant flowing in the outdoor evaporator using the refrigerant branched from the refrigerant circulation line; It is characterized in that to improve the heating performance in the heat pump mode under low ambient temperature conditions.

The present invention provides a mutual heat exchange between an outdoor evaporator side refrigerant circulated by a first compressor in a heat pump mode by connecting two compressors in parallel and an outdoor condenser side refrigerant circulated by a second compressor by branching the circulating refrigerant. By securing the necessary heat source in the heat pump mode, the heat source can be smoothly operated by the two compressors, even under low ambient temperature, and the heat pump mode can be smoothly operated. This simplicity saves parts and costs.

In addition, by using only one compressor, the high temperature and high pressure gaseous refrigerant discharged from the compressor is branched so that some gaseous refrigerants are used for heating, and some gaseous refrigerants are used for securing a heat source. Therefore, the number of parts and cost can be further reduced.

In addition, by controlling the rotation speed of the first and second compressors, the flow rate of the refrigerant distributed to the refrigerant circulation line and the first cooling distribution branch line may be adjusted, thereby maximizing efficiency for improving heating performance.

In addition, by installing an integrated outdoor evaporator and an outdoor condenser inside the water-cooled heat exchanger filled with cooling water, the outdoor evaporator and the outdoor condenser exchange heat smoothly with the cooling water, thereby improving heat exchange efficiency.

In addition, by providing a stirring device for stirring the cooling water in the water-cooled heat exchanger, the heat exchange efficiency is further improved in the outdoor evaporator and the outdoor condensation period to heat exchange with the cooling water.

In addition, the outdoor evaporator and the outdoor condenser are integrally formed, and a plurality of doors are installed in front of the outdoor condenser to cut off the outside air in a condition where the outside air temperature is low, thereby ensuring a heat source for heating in the heat pump mode to smooth the heat pump mode. Can work.

1 is a schematic view showing a conventional heat pump system for a vehicle,
2 is a block diagram showing an air conditioner mode of a vehicle heat pump system according to a first embodiment of the present invention;
3 is a configuration diagram showing a heat pump mode of a vehicle heat pump system according to a first embodiment of the present invention;
4 is a block diagram showing an air conditioner mode of a vehicle heat pump system according to a second embodiment of the present invention;
5 is a configuration diagram showing a heat pump mode of a vehicle heat pump system according to a second embodiment of the present invention;
6 is a configuration diagram showing a heat pump mode of a vehicle heat pump system according to a third embodiment of the present invention;
7 is a perspective view schematically showing a water-cooled heat exchanger in a vehicle heat pump system according to the present invention.

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

First, the vehicle heat pump system according to the first embodiment of the present invention, as shown in Figs. 2 and 3, the first compressor 100, the indoor heat exchanger 110, the first expansion means 130 and , An outdoor evaporator 140, and a heat supply means 200.

Here, the first compressor 100, the indoor side heat exchanger 110, the first expansion means 130, and the outdoor evaporator 140 is configured to be sequentially connected on the refrigerant circulation line (R), The heat supply means 200 is configured on the first refrigerant branch line R1 connected in parallel with the refrigerant circulation line R.

The first compressor 100 receives and drives the refrigerant discharged from the outdoor evaporator 140 in the heat pump mode while driving by receiving power from an engine (such as an internal combustion engine or a motor) to obtain a high temperature and high pressure gas. Supply to the indoor heat exchanger 110 side, and is stopped in the air conditioning mode. In the air conditioner mode, the second compressor 101 described later is operated.

The indoor side heat exchanger 110 is installed inside the air conditioning case 170 and is connected to the refrigerant circulation line R to heat the high temperature and high pressure gaseous refrigerant discharged from the first compressor 100 at a high temperature and high pressure. It is to heat exchange with the air flowing in the air conditioning case 170 to condense to the liquid state of.

The indoor heat exchanger 110 is installed downstream of the indoor evaporator 120 to be described later inside the air conditioning case 170 to serve as a heater (condenser). That is, the air blown into the air conditioning case 170 through the blower (not shown) heat exchanges with the high temperature and high pressure refrigerant inside the indoor heat exchanger 110 in the process of passing through the indoor heat exchanger 110. After changing to the warm air, it is discharged into the vehicle interior to heat the interior of the vehicle.

The first expansion means 130 is installed on the refrigerant circulation line R, and expands the refrigerant discharged from the indoor heat exchanger 110 to a low-temperature, low-pressure liquid phase (wetting) state. It is supplied to the outdoor evaporator 140 side.

On the other hand, the first expansion means 130 and the second expansion means 131 to be described later it is preferable to use an expansion valve.

The outdoor evaporator 140 is installed on the refrigerant circulation line R to evaporate the refrigerant discharged from the first expansion means 130 to a gaseous state and supply it to the first compressor 100. .

The outdoor evaporator 140 is evaporated by a heat source supplied from the heat supply means 200.

The refrigerant circulation line R described above is a line that serves as a heating role in the heat pump mode.

On the other hand, when the outdoor air temperature is high (approximately higher than the ambient temperature 0 ℃), the refrigerant is smoothly evaporated only by heat exchange between the outdoor evaporator 140 and the outside air, it is possible to secure the heat source required for heating in the heat pump mode.

In addition, when a sufficient heat source is secured when the refrigerant in the outdoor evaporator 140 evaporates, the refrigerant in the outdoor evaporator 140 is overheated in the process of evaporating, thereby increasing the temperature, and the refrigerant having the temperature increased by Since the temperature is further increased while passing through the first compressor 100, the heating is further supplied to the indoor heat exchanger 110, thereby further improving heating performance. Thus, it is very important to secure a heat source in the heat pump system.

However, when the outdoor air temperature is low (approximately 0 ° C. or less), when the outdoor evaporator 140 and the cold outdoor air heat exchange, the saturation pressure and temperature of the coolant are lowered, thereby reducing the coolant flow rate and thereby heating in the heat pump mode. As well as the performance is reduced, the refrigerant in the outdoor evaporator 140 does not evaporate smoothly and eventually the heating performance of the system is deteriorated or the operation of the heat pump mode becomes impossible.

Therefore, in the present invention, in the heat pump mode under low ambient temperature, instead of securing a heat source through a separate external device, a sufficient heat source is secured through its own system to smoothly operate the heat pump mode and improve heating performance. It is provided with a heat supply means (200).

The heat supply means 200 supplies heat to evaporate the refrigerant flowing in the outdoor evaporator 140 by using the refrigerant branched from the refrigerant circulation line R.

The heat supply means 200 includes a first refrigerant branch line R1, a second compressor 101, and an outdoor condenser 150.

The first refrigerant branch line R1 is a line connected in parallel with the refrigerant circulation line R as shown in FIG. 3, and branches the refrigerant branched by branching the refrigerant discharged from the outdoor evaporator 140 to the indoor side. In the heat exchanger 110 is joined to the refrigerant circulated to the first expansion means (130).

That is, as shown in Figure 3, the inlet of the first refrigerant branch line (R1) is connected to the refrigerant circulation line (R) of the outlet side of the outdoor evaporator 140, the outlet is the inlet of the first expansion means 130 It is connected to the side refrigerant circulation line (R).

In addition, after separating the gaseous refrigerant and the liquid refrigerant from the refrigerant discharged from the outdoor evaporator 140 at the branching points of the refrigerant circulation line R and the first refrigerant branch line R1, the gaseous refrigerant is circulated through the refrigerant. An accumulator 180 for distributing to the first compressor 100 of the line R and the second compressor 101 of the first refrigerant branch line R1 is installed.

At this time, the flow rate of the refrigerant branched into the refrigerant circulation line R and the first refrigerant branch line R1 through the accumulator 180 is the rotation speed (RPM) of the first compressor 100 and the second compressor 101. It can be adjusted by), and of course, a separate flow control valve (not shown) can also be installed.

Therefore, the gaseous refrigerant discharged from the outdoor evaporator 140 is branched from the accumulator 180 and partly flows to the first compressor 100 of the refrigerant circulation line R, and a part of the first refrigerant branch line R1. It will flow to the second compressor (101) of.

The refrigerant flowing into the second compressor 101 passes through the outdoor condenser 150, joins the refrigerant flowing from the indoor heat exchanger 110 to the first expansion means 130, and then the first refrigerant. Pass through the expansion means 130 and the outdoor evaporator 140, and then repeats the refrigerant circulation process.

The second compressor 101 is installed on the first refrigerant branch line R1 and compresses the refrigerant branched to the first refrigerant branch line R1 to discharge the refrigerant in a gaseous state of high temperature and high pressure.

The outdoor condenser 150 is installed on the first refrigerant branch line R1 and has a high temperature and high pressure gaseous refrigerant discharged from the second compressor 101 and a low temperature low pressure liquid refrigerant in the outdoor evaporator 140. Are mutually heat exchanged.

In this process, the gaseous refrigerant in the outdoor condenser 150 is converted into a liquid refrigerant while condensing, and the liquid refrigerant in the outdoor evaporator 140 is overheated and changed into a gaseous refrigerant.

As such, the second compressor 101 compresses the refrigerant branched from the refrigerant circulation line R to make a gaseous refrigerant having a high temperature and high pressure, thereby making a heat source required for heating in the heat pump mode.

In other words, by connecting two compressors in parallel to one system, the refrigerant circulation line R in which the refrigerant circulates by the first compressor 100 becomes a heating line in the heat pump mode, and the second compressor 101 The first refrigerant branch line (R1) through which the refrigerant circulates by) becomes a line for making a heat source.

As such, by simultaneously driving the two compressors, a heat source can be secured in the heat pump system under a low outside air temperature to smoothly drive the heat pump mode and improve the heating performance.

In addition, in order to secure the efficiency and heating performance of the heat pump system, by adjusting the rotation speed (RPM) of the first compressor 100 and the second compressor 101, respectively, the efficiency can be maximized.

In addition, the water-cooled heat exchanger is installed to surround the outside of the outdoor evaporator 140 and the outdoor condenser 150 to increase heat exchange efficiency between the outdoor evaporator 140 and the outdoor condenser 150. Group 160 is provided.

The outdoor evaporator 140 and the outdoor condenser 150 are integrally formed, and heat exchange with each other through the cooling water in the water-cooled heat exchanger 160.

At this time, the stirring device 161 is installed inside the water-cooled heat exchanger 160 to further activate heat exchange between the outdoor evaporator 140 and the outdoor condenser 150 by stirring the cooling water.

As the stirring device 161, a propeller may be used as shown in the drawing.

In addition, one side of the water-cooled heat exchanger 160 is provided with a cooling water circulation line (W) provided with a water pump 166 to circulate the cooling water in the water-cooled heat exchanger (160), the cooling water circulation line (W) On the c), a water cooling radiator 165 for exchanging heat between the cooling water circulating in the cooling water circulation line W and the external air is installed.

Therefore, in the air conditioner mode, as shown in FIG. 2, the coolant in the water-cooled heat exchanger 160 is circulated to the water-cooled radiator 165 through the water pump 166, at which time the water-cooled radiator 165 The flowing coolant is cooled by heat exchange with external air.

Subsequently, the cooling water cooled through the water cooling radiator 165 is introduced into the water cooling heat exchanger 160 to exchange heat with the outdoor condenser 150 to condense the gaseous refrigerant passing through the outdoor condenser 150.

Meanwhile, in the air conditioner mode, the first compressor 100 is stopped and no refrigerant flows through the outdoor evaporator 140.

In the heat pump mode, as shown in FIG. 3, the water pump 166 is stopped, and the stirring device 161 in the water-cooled heat exchanger 160 is operated to agitate the cooling water in the water-cooled heat exchanger 160. The heat exchange between the outdoor evaporator 140 and the outdoor condenser 150 in the water-cooled heat exchanger 160 is improved.

On the other hand, as shown in Figure 7, the outdoor evaporator 140 and the outdoor condenser 150 accommodated in the water-cooled heat exchanger 160 is an integral structure, the cooling water in the water-cooled heat exchanger 160 and the outdoor evaporator 140 and A cooling water passage 151 is formed to smoothly pass through the outdoor condenser 150, and a heat dissipation fin 152 is installed inside the cooling water passage 151 to improve heat exchange performance.

And, inside the air conditioning case 170, the indoor evaporator 120 is installed upstream of the indoor heat exchanger 110 in the air flow direction in the air conditioning case 170.

In addition, the air conditioner mode by allowing the refrigerant discharged from the second compressor 101 and the outdoor condenser 150 on the first refrigerant branch line R1 to circulate to the second compressor 101 via the indoor evaporator 120. In order to configure a city air conditioning cycle, a second refrigerant branch line R2 connected in parallel with the first refrigerant branch line R1 is installed.

In addition, a second expansion means 131 is installed on the inlet side second refrigerant branch line R2 of the indoor evaporator 120 to expand the refrigerant circulated from the outdoor condenser 150 to the indoor evaporator 120.

In addition, on and off valves 190 and 191 are provided at the inlet and outlet sides of the first refrigerant branch line R1 connected in parallel with the refrigerant circulation line R, respectively. The second refrigerant branching line R2 is constituted by a separate line.

Meanwhile, some sections of the first refrigerant branch line R1 and the second refrigerant branch line R2 are shared. That is, the section connecting the outdoor condenser 150 in the second compressor 101 is shared.

Accordingly, in the air conditioner mode, as shown in FIG. 2, the on / off valves 190 and 191 close the inlet and the outlet of the first refrigerant branch line R1, respectively, and then the second compressor 101 is closed. In operation, the gaseous refrigerant discharged from the second compressor 101 is supplied to the outdoor condenser 150, and the gaseous refrigerant supplied to the outdoor condenser 150 exchanges heat with the cooling water in the water-cooled heat exchanger 160. It is condensed through and then discharged.

After the refrigerant discharged from the outdoor condenser 150 is expanded through the second expansion means 131, the refrigerant flows into the indoor evaporator 120, and the refrigerant introduced into the indoor evaporator 120 is an air conditioning case 170. As the evaporation is carried out through heat exchange with the air flowing inside), the air discharged into the vehicle interior is cooled by the endothermic action by the latent heat of evaporation of the refrigerant.

Thereafter, the refrigerant discharged from the indoor evaporator 120 is introduced into the second compressor 101 again.

In addition, between the indoor evaporator 120 and the indoor heat exchanger 110 in the air conditioning case 170, air (cold air) and the indoor heat exchanger bypassing the indoor heat exchanger 110. A temperature control door 175 for adjusting the amount of air (hot air) passing through the 110 is installed to adjust the temperature of the air discharged into the cabin.

Meanwhile, a receiver dryer 181 is installed on the outlet side first refrigerant branch line R1 of the outdoor condenser 150. The receiver dryer 181 separates the liquid refrigerant and the gaseous refrigerant from the refrigerant discharged from the outdoor condenser 150 to supply only the liquid refrigerant to the second expansion means 131.

On the other hand, in a condition where the outside air temperature is low, as shown in FIG. 3, the water pump 166 is stopped and circulation of the cooling water is also stopped, thereby preventing the water cooling radiator 165 from freezing.

In addition, high-capacity PTC heaters used for heating in electric vehicles or fuel cell vehicles are excessively expensive and have a lower efficiency than 1. When the heat pump system is composed of two compressors at a similar price, the efficiency is higher than 1. More efficient.

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

end. Air conditioning mode (cooling mode)

In the air conditioner mode (cooling mode), as shown in FIG. 2, the on / off valves 190 and 191 close the inlet and outlet of the first refrigerant branch line R1, respectively, and the first compressor 100. ) Is stopped so that the refrigerant does not circulate in the refrigerant circulation line R, while the second compressor 101 is operated so that a portion of the first refrigerant branch line R1 and the second refrigerant branch line R1 are stopped. Through R2, the refrigerant is circulated.

When the second compressor 101 is operated, the high temperature and high pressure gaseous refrigerant discharged after being compressed by the second compressor 101 is supplied to the outdoor condenser 150 and supplied to the outdoor condenser 150. The gaseous refrigerant is discharged after condensing through heat exchange with the cooling water in the water-cooled heat exchanger (160).

At this time, the cooling water in the water-cooled heat exchanger 160 is cooled through heat exchange with external air in the process of circulating the water-cooled radiator 165 through the water pump 166.

Subsequently, the liquid refrigerant condensed and discharged from the outdoor condenser 150 is expanded through the second expansion means 131, then flows into the indoor evaporator 120, and flows into the indoor evaporator 120. The refrigerant is cooled by cooling the air discharged into the vehicle interior by the endothermic action of the latent heat of evaporation while the refrigerant evaporates through heat exchange with the air flowing in the air conditioning case 170.

Thereafter, the refrigerant discharged from the indoor evaporator 120 is introduced into the second compressor 101 to recycle the cycle as described above.

I. Heat Pump Mode (Heating Mode)

In the heat pump mode (heating mode), as shown in FIG. 3, the on / off valves 190 and 191 open inlets and outlets of the first refrigerant branch line R1, respectively, and the first compressor ( Both the 100 and the second compressor 101 operate to circulate the refrigerant to the refrigerant circulation line R and the first refrigerant branch line R1.

On the other hand, the second expansion means 131 closes the flow path so that the refrigerant does not circulate to the second refrigerant branch line (R2), the water pump 166 is stopped, the water-cooled heat exchanger 160 The stirring device 161 inside is operated to agitate the cooling water.

When the first compressor 100 is operated, the high temperature and high pressure gaseous refrigerant discharged after being compressed by the first compressor 100 is supplied to the indoor side heat exchanger 110, and the indoor side heat exchanger 110. The high-temperature, high-pressure gaseous phase refrigerant supplied to the C) is heated by heating the air discharged into the vehicle interior while condensed through heat exchange with air flowing in the air conditioning case 170.

Subsequently, the liquid refrigerant discharged from the indoor heat exchanger 110 is expanded through the first expansion means 130 and then flows into the outdoor evaporator 140 and flows into the outdoor evaporator 140. The liquid refrigerant is discharged after evaporating while exchanging heat with the gaseous refrigerant and the cooling water on the outdoor condenser 150 side.

The refrigerant discharged from the outdoor evaporator 140 flows into the accumulator 180 to separate the liquid refrigerant and the gaseous refrigerant, and then only the gaseous refrigerant is distributed to the refrigerant circulation line R and the first cold distribution branch line, respectively.

Subsequently, the refrigerant distributed in the refrigerant circulation line R flows into the first compressor 100 to recycle the cycle as described above, and the refrigerant distributed in the first refrigerant branch line R1 includes the first refrigerant. It flows into the two compressors 101.

The refrigerant introduced into the second compressor 101 is compressed to be a gaseous refrigerant having a high temperature and high pressure, and is supplied to the outdoor condenser 150.

The high temperature and high pressure gaseous refrigerant supplied to the outdoor condenser 150 exchanges heat with the low temperature and low pressure liquid refrigerant on the outdoor evaporator 140 through the cooling water in the water-cooled heat exchanger 160. The refrigerant in 150 is condensed and changed into a liquid refrigerant, and the refrigerant in the outdoor evaporator 140 is changed into a gaseous refrigerant while evaporating.

Subsequently, the liquid refrigerant discharged from the outdoor condenser 150 merges with the refrigerant flowing from the indoor heat exchanger 110 toward the first expansion means 130, and then is supplied to the first expansion means 130. Inflated.

The refrigerant discharged to the first expansion means 130 is recycled to the cycle as described above while flowing to the outdoor evaporator 140 and the accumulator 180.

4 is a block diagram showing an air conditioner mode of a vehicle heat pump system according to a second embodiment of the present invention, Figure 5 is a block diagram showing a heat pump mode of a vehicle heat pump system according to a second embodiment of the present invention. Only parts different from the first embodiment described above will be described.

In the heat pump system according to the second embodiment, the heat supply means 200 is changed.

The heat supply means 200 according to the second embodiment includes a first refrigerant branch line R1a and an outdoor condenser 150.

The first refrigerant branching line R1a is a line connected in parallel with the refrigerant circulation line R as shown in FIG. 5, and branches the refrigerant branched by branching the refrigerant discharged from the first compressor 100 into the room. In the side heat exchanger 110 to join the refrigerant circulating to the first expansion means (130).

That is, as shown in FIG. 5, the inlet of the first refrigerant branch line R1a is connected to the outlet refrigerant circulation line R of the first compressor 100, and the outlet thereof is the inlet of the first expansion means 130. It is connected to the side refrigerant circulation line (R).

The outdoor condenser 150 is installed on the first refrigerant branch line R1a and the high temperature and high pressure gaseous refrigerant discharged from the first compressor 100 and branched, and the low temperature low pressure liquid in the outdoor evaporator 140. The refrigerants are mutually heat exchanged.

In this process, the gaseous refrigerant in the outdoor condenser 150 is converted into a liquid refrigerant while condensing, and the liquid refrigerant in the outdoor evaporator 140 is overheated and changed into a gaseous refrigerant.

As such, a portion of the high-temperature, high-pressure gaseous refrigerant discharged from the first compressor 100 is branched and supplied to the outdoor condenser 150 and then heat-exchanged with the outdoor evaporator 140, thereby providing a heat source for heating in the heat pump mode. Will be made.

As described above, in the second embodiment, the second compressor 101 of the first embodiment is deleted and only one compressor is used to secure a heat source in the heat pump mode. Thus, the configuration of the entire system is simpler. The number of parts and cost can be further reduced.

In the air conditioner mode, the first refrigerant branching line may circulate only through the first refrigerant branching line R1a and the second refrigerant branching line R2a so that the refrigerant circulating through the first compressor 100 may circulate only. An on-off valve 197 is provided at the outlet side of R1a, and between the outlet side refrigerant circulation line R of the accumulator 180 and between the first compressor 100 and the indoor heat exchanger 110. On-off valves 195 and 196 are provided on the refrigerant circulation line R, respectively.

Hereinafter, a refrigerant circulation process of the vehicle heat pump system according to the second embodiment will be described.

In the air conditioner mode (cooling mode), as shown in FIG. 4, all three on-off valves 195, 196, and 197 close the flow path, and the first compressor 100 is operated to operate the first refrigerant branch. The refrigerant is circulated through the line R1a and the second refrigerant branch line R2a.

The high temperature and high pressure gaseous refrigerant discharged after being compressed by the first compressor 100 is supplied to the outdoor condenser 150, and the gaseous refrigerant supplied to the outdoor condenser 150 is cooling water in the water-cooled heat exchanger 160. It is condensed through heat exchange with and discharged.

At this time, the cooling water in the water-cooled heat exchanger 160 is cooled through heat exchange with external air in the process of circulating the water-cooled radiator 165 through the water pump 166.

Subsequently, the liquid refrigerant condensed and discharged from the outdoor condenser 150 is expanded through the second expansion means 131, then flows into the indoor evaporator 120, and flows into the indoor evaporator 120. The refrigerant is cooled by cooling the air discharged into the vehicle interior by the endothermic action of the latent heat of evaporation while the refrigerant evaporates through heat exchange with the air flowing in the air conditioning case 170.

Thereafter, the refrigerant discharged from the indoor evaporator 120 is introduced into the first compressor 100 to recycle the cycle as described above.

In the heat pump mode (heating mode), as shown in FIG. 5, all three on-off valves 195, 196, and 197 open the flow path, and the first compressor 100 is operated to circulate the refrigerant. The refrigerant circulates in the line R and the first refrigerant branch line R1a.

On the other hand, the second expansion means 131 closes the flow path so that the refrigerant does not circulate to the second refrigerant branch line (R2a), the water pump 166 is stopped, the water-cooled heat exchanger 160 The stirring device 161 inside is operated to agitate the cooling water.

When the first compressor 100 is operated, the high temperature and high pressure gaseous refrigerant discharged after being compressed by the first compressor 100 is supplied to the indoor side heat exchanger 110, and the indoor side heat exchanger 110. The high-temperature, high-pressure gaseous phase refrigerant supplied to the C) is heated by heating the air discharged into the vehicle interior while condensed through heat exchange with air flowing in the air conditioning case 170.

Subsequently, the liquid refrigerant discharged from the indoor heat exchanger 110 is expanded through the first expansion means 130 and then flows into the outdoor evaporator 140 and flows into the outdoor evaporator 140. The liquid refrigerant is discharged after evaporating while exchanging heat with the gaseous refrigerant and the cooling water on the outdoor condenser 150 side.

After the refrigerant discharged from the outdoor evaporator 140 flows into the accumulator 180 to separate the liquid refrigerant and the gaseous refrigerant, only the gaseous refrigerant is introduced into the first compressor 100 to recycle the cycle as described above. do.

A portion of the high temperature and high pressure gaseous refrigerant discharged from the first compressor 100 is distributed to the first refrigerant branch line R1a and supplied to the outdoor condenser 150.

The high temperature and high pressure gaseous refrigerant supplied to the outdoor condenser 150 exchanges heat with the low temperature and low pressure liquid refrigerant on the outdoor evaporator 140 through the cooling water in the water-cooled heat exchanger 160. The refrigerant in 150 is condensed and changed into a liquid refrigerant, and the refrigerant in the outdoor evaporator 140 is changed into a gaseous refrigerant while evaporating.

Subsequently, the liquid refrigerant discharged from the outdoor condenser 150 merges with the refrigerant flowing from the indoor heat exchanger 110 toward the first expansion means 130, and then is supplied to the first expansion means 130. Inflated.

The refrigerant discharged to the first expansion means 130 is recycled to the cycle as described above while flowing to the outdoor evaporator 140 and the accumulator 180.

FIG. 6 is a configuration diagram illustrating a heat pump mode of a vehicle heat pump system according to a third embodiment of the present invention, and only portions different from those of the first and second embodiments described above will be described.

The heat pump system according to the third embodiment removes the water-cooled heat exchanger 160 in the second embodiment.

In addition, in the third embodiment, the outdoor evaporator 140 and the outdoor condenser 150 are integrally formed, and the outdoor condenser 150 and the outdoor evaporator 140 are located in front of the outdoor condenser 150 according to the outside air temperature. The plurality of doors 155 are installed to selectively block outside air blown to the air.

Therefore, in the air conditioner mode (not shown), the plurality of doors 155 are opened to exchange heat with the outdoor condenser 150 to condense the gaseous refrigerant in the outdoor condenser 150.

In the heat pump mode, as shown in FIG. 6, the plurality of doors 155 are closed to block outside air. In this case, since the outdoor condenser 150 and the outdoor evaporator 140 are integrally formed to exchange heat, the high-temperature and high-pressure gas phase refrigerant flowing through the outdoor condenser 150 and the low temperature and low pressure flowing through the outdoor evaporator 140 are included. As the liquid refrigerant exchanges with each other, the gaseous refrigerant of the outdoor condenser 150 is condensed to change into liquid refrigerant, and the liquid refrigerant of the outdoor evaporator 140 is changed into gaseous refrigerant while evaporating.

On the other hand, the refrigerant circulation process of the vehicle heat pump system according to the third embodiment is the same as the second embodiment will be omitted.

100: first compressor 101: second compressor
110: indoor side heat exchanger 120: indoor evaporator 120
130: first expansion means 131: second expansion means
140: outdoor evaporator 150: outdoor condenser
160: water-cooled heat exchanger 161: agitator
165: water-cooled radiator 166: water pump
170: air conditioning case 175: temperature control door
180: Accumulator 190,191,195,196,197: On-off valve
200: heat supply means
R: Refrigerant circulation line R1, R1a: First refrigerant branch line
R2, R2a: Second refrigerant branch line W: Coolant circulation line

Claims (12)

A first compressor 100 installed on the refrigerant circulation line R for compressing and discharging the refrigerant;
An indoor heat exchanger installed inside the air conditioning case 170 and connected to the refrigerant circulation line R to heat exchange the refrigerant discharged from the first compressor 100 with the air flowing in the air conditioning case 170. 110,
A first expansion means (130) installed on the refrigerant circulation line (R) to expand the refrigerant discharged from the indoor heat exchanger (110);
An outdoor evaporator 140 installed on the refrigerant circulation line R to evaporate the refrigerant discharged from the first expansion means 130;
It includes a heat supply means for supplying heat to evaporate the refrigerant flowing in the outdoor evaporator 140 by using a refrigerant branched from the refrigerant circulation line (R),
The heat supply means 200,
Branching the refrigerant discharged from the outdoor evaporator 140 in parallel with the refrigerant circulation line (R) to join the branched refrigerant to the refrigerant circulated from the indoor heat exchanger (110) to the first expansion means (130). First refrigerant branch line (R1) connected to the,
A second compressor (101) installed on the first refrigerant branch line (R1) to compress and discharge the branched refrigerant;
It is installed on the first refrigerant branch line (R1) and consists of an outdoor condenser 150 for mutual heat exchange between the refrigerant discharged from the second compressor 101 and the refrigerant in the outdoor evaporator 140,
A vehicle heat pump system, characterized in that to improve the heating performance in the heat pump mode under low ambient temperature. delete delete The method of claim 1,
In order to increase the heat exchange efficiency between the outdoor evaporator 140 and the outdoor condenser 150, and installed to surround the outside of the outdoor evaporator 140 and the outdoor condenser 150, and inside the water-cooled heat exchanger filled with a coolant ( 160 is provided,
One side of the water-cooled heat exchanger 160 is provided with a cooling water circulation line (W) provided with a water pump 166 to circulate the cooling water in the water-cooled heat exchanger 160,
Vehicle cooling water pump system, characterized in that the cooling water circulation line (W) on the cooling water circulating the cooling water circulation line (W) and the water cooling radiator (165) for mutual heat exchange. 5. The method of claim 4,
The inside of the water-cooled heat exchanger (160) is a vehicle heat pump system, characterized in that the stirring device (161) is installed to enable the heat exchange between the outdoor evaporator (140) and the outdoor condenser (150) by stirring the cooling water. The method of claim 1,
At a branch point of the refrigerant circulation line R and the first refrigerant branch line R1, after separating the gaseous refrigerant and the liquid refrigerant from the refrigerant discharged from the outdoor evaporator 140, the gaseous refrigerant is replaced with the refrigerant circulation line ( An accumulator (180) for distributing to the first compressor (100) of R) and the second compressor (101) of the first refrigerant branch line (R1) is installed. The method of claim 1,
Inside the air conditioning case 170, an indoor evaporator 120 is installed upstream of the indoor heat exchanger 110 in the air flow direction in the air conditioning case 170,
In the air conditioner mode, the refrigerant discharged from the second compressor 101 and the outdoor condenser 150 on the first refrigerant branch line R1 is circulated to the second compressor 101 through the indoor evaporator 120. In order to configure a cycle, a second refrigerant branch line R2 connected in parallel with the first refrigerant branch line R1 is installed.
The second expansion means 131 is installed on the inlet side second refrigerant branch line R2 of the indoor evaporator 120 to expand the refrigerant circulated from the outdoor condenser 150 to the indoor evaporator 120. Automotive heat pump system. The method of claim 7, wherein
On and off valves 190 and 191 are provided at the inlet and outlet sides of the first refrigerant branch line R1 connected in parallel with the refrigerant circulation line R, respectively, to form the refrigerant circulation line R and the second refrigerant. A vehicle heat pump system, characterized in that the refrigerant branch line (R2) is a separate line. A first compressor 100 installed on the refrigerant circulation line R for compressing and discharging the refrigerant;
An indoor heat exchanger installed inside the air conditioning case 170 and connected to the refrigerant circulation line R to heat exchange the refrigerant discharged from the first compressor 100 with the air flowing in the air conditioning case 170. 110,
A first expansion means (130) installed on the refrigerant circulation line (R) to expand the refrigerant discharged from the indoor heat exchanger (110);
An outdoor evaporator 140 installed on the refrigerant circulation line R to evaporate the refrigerant discharged from the first expansion means 130;
It includes a heat supply means for supplying heat to evaporate the refrigerant flowing in the outdoor evaporator 140 by using a refrigerant branched from the refrigerant circulation line (R),
The heat supply means 200,
The refrigerant circulation line (R) and branched to the refrigerant discharged from the first compressor 100 to join the branched refrigerant to the refrigerant circulated from the indoor heat exchanger 110 to the first expansion means (130) and A first refrigerant branch line R1a connected in parallel,
It is installed on the first refrigerant branch line (R1a) and consists of an outdoor condenser (150) for mutual heat exchange between the refrigerant discharged from the first compressor 100 and the branched refrigerant and the refrigerant in the outdoor evaporator 140, To improve the heating performance in the heat pump mode in low conditions,
Inside the air conditioning case 170, an indoor evaporator 120 is installed upstream of the indoor heat exchanger 110 in the air flow direction in the air conditioning case 170,
In the air conditioner mode, the refrigerant discharged from the first compressor 100 is circulated to the first compressor 100 through the outdoor condenser 150 and the indoor evaporator 120 on the first refrigerant branch line R1a. The inlet is connected to the outlet side first refrigerant branch line R1a of the outdoor condenser 150 and the outlet is connected to the inlet refrigerant circulation line R of the first compressor 100 to form an air conditioning cycle. 2 refrigerant branch line (R2a) is installed,
The second expansion means 131 is installed on the inlet side second refrigerant branch line R2a of the indoor evaporator 120 to expand the refrigerant circulated from the outdoor condenser 150 to the indoor evaporator 120. Automotive heat pump system. The method of claim 9,
The outdoor evaporator (140) and the outdoor condenser (150) is formed integrally with a vehicle heat pump system. 11. The method of claim 10,
The front of the outdoor condenser 150, the vehicle heat pump system, characterized in that the door (155) is installed to selectively block the outside air blown to the outdoor condenser (150) and the outdoor evaporator (140) according to the outside air temperature. 10. The method according to claim 7 or 9,
A temperature for controlling the amount of air passing through the indoor heat exchanger 110 and the air passing through the indoor heat exchanger 110 between the indoor evaporator 120 and the indoor heat exchanger 110. Vehicle heat pump system, characterized in that the adjustment door (175) is installed.

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