KR101150936B1 - Freezing cycle of air conditioner for vehicles - Google Patents

Abstract

The present invention relates to a refrigeration cycle of a vehicle air conditioner, and more particularly, in the refrigeration cycle consisting of a compressor, a condenser, an expansion valve, and an evaporator, the refrigerant discharged from the compressor and a part of the refrigerant at the outlet of the condenser are mixed between the compressor and the condenser. By providing an ejector (ejector) to supply to the condenser, the flow rate of the refrigerant flowing into the condenser is increased to improve the heat dissipation performance according to the increase in the flow rate, and the dryness of the refrigerant flowing into the condenser is reduced, thereby reducing the size of the condenser due to heat load reduction. The present invention relates to a refrigeration cycle of a vehicle air conditioner that can be reduced and can utilize a boosting function of the ejector, thereby reducing the load on the compressor and improving the efficiency of the air conditioner.

Accordingly, the present invention provides a compressor 10 for sucking and compressing a refrigerant, a condenser 20 for condensing the refrigerant compressed by the compressor 10, and an expansion valve for throttling the refrigerant condensed in the condenser 20. 30 and the refrigeration cycle of the vehicle air conditioner comprising an evaporator 40 for evaporating the refrigerant flowing from the expansion valve 30, the compressor 10 between the compressor 10 and the condenser 20. Ejector (ejector) 50 for mixing the refrigerant discharged from the and the outlet refrigerant of the condenser 20 is supplied to the condenser 20 is characterized in that it is provided.

 Refrigeration cycle, compressor, condenser, ejector

Description

Freezing cycle of air conditioner for vehicles

The present invention relates to a refrigeration cycle of a vehicle air conditioner, and more particularly, in the refrigeration cycle consisting of a compressor, a condenser, an expansion valve, and an evaporator, the refrigerant discharged from the compressor and a part of the refrigerant at the outlet of the condenser are mixed between the compressor and the condenser. By providing an ejector (ejector) to supply to the condenser, the flow rate of the refrigerant flowing into the condenser is increased to improve the heat dissipation performance according to the increase in the flow rate, and the dryness of the refrigerant flowing into the condenser is reduced, thereby reducing the size of the condenser due to heat load reduction. The present invention relates to a refrigeration cycle of a vehicle air conditioner that can be reduced and can utilize a boosting function of the ejector, thereby reducing the load on the compressor and improving the efficiency of the air conditioner.

The vehicle air conditioner is a vehicle interior that is installed for the purpose of securing the driver's front and rear view by removing the frost from the windshield or heating in the summer or winter, or during the rain or winter season. Such an air conditioning apparatus is usually provided with a heating system and a cooling system at the same time, thereby cooling, heating, or ventilating the interior of a vehicle by selectively introducing outside air or bet, heating or cooling the air, and then blowing the air into the interior of the vehicle.

In general, the refrigeration cycle of such an air conditioning apparatus, as shown in Figure 1, a compressor (Compressor 1) for compressing and sending out the refrigerant, a condenser (Condenser) for condensing the high-pressure refrigerant from the compressor ( 2) an expansion valve 3 for condensing the liquefied refrigerant condensed in the condenser 2, and a low pressure liquid refrigerant condensed by the expansion valve 3 is blown to the vehicle interior. The evaporator 4 or the like that cools the air discharged to the room by the endothermic action of the evaporative latent heat of the refrigerant by evaporating by exchanging heat with the air is connected to the refrigerant pipe 5, and the following refrigerant circulation process is performed. Cool the interior of the car through.

When the cooling switch (not shown) of the vehicle air conditioner is turned on, the compressor 1 first drives the engine power and sucks and compresses the low-temperature, low-pressure gaseous refrigerant to the condenser 2 in a high-temperature, high-pressure gas state. The condenser 2 exchanges the gaseous refrigerant with outside air to condense it into a liquid of high temperature and high pressure. Subsequently, the liquid refrigerant discharged from the condenser 2 in the state of high temperature and high pressure is rapidly expanded by the throttling action of the expansion valve 3 and is sent to the evaporator 4 in the low temperature low pressure wet state, and the evaporator 4 is The refrigerant is heat-exchanged with the air blower (not shown) blowing into the vehicle interior. Accordingly, the refrigerant is evaporated from the evaporator 4, discharged into a gas state at low temperature and low pressure, and then sucked back into the compressor 1 to recycle the refrigeration cycle as described above. In the above refrigerant circulation process, the cooling of the vehicle interior is cooled by latent heat of evaporation of the liquid refrigerant circulating in the evaporator 4 while the air blown by the blower (not shown) passes through the evaporator 4 as described above. This is done by discharging the vehicle interior in a cold state.

Meanwhile, a receiver dryer (not shown) is provided between the condenser 2 and the expansion valve 3 to separate the refrigerant in the gas phase and the liquid phase, so that only the liquid refrigerant can be supplied to the expansion valve 3. .

However, the refrigeration cycle as described above is limited to increase the cooling efficiency, so the development of the cooling efficiency is urgently needed.

In addition, since miniaturization of each component constituting the refrigeration cycle for the miniaturization of the air conditioning apparatus is directly connected to the cooling efficiency, there is a limit to the miniaturization of each component.

An object of the present invention for solving the above problems is to provide a condenser by mixing a portion of the refrigerant discharged from the compressor and the outlet of the condenser between the compressor and the condenser in the refrigeration cycle consisting of a compressor, a condenser, expansion valve, evaporator By providing an ejector, the flow rate of the refrigerant flowing into the condenser is increased, and the heat dissipation performance is improved by increasing the flow rate, and the dryness of the refrigerant flowing into the condenser is reduced, thereby reducing the size of the condenser due to the reduction of heat load. Since the booster function of the ejector can be utilized, the load on the compressor is reduced to provide a refrigeration cycle of a vehicle air conditioner that can improve the efficiency of the air conditioner.

The present invention for achieving the above object is, a compressor for sucking and compressing a refrigerant, a condenser for condensing the refrigerant compressed in the compressor, an expansion valve for condensing the refrigerant condensed in the condenser, and the inflow from the expansion valve In the refrigeration cycle of the vehicle air conditioner comprising an evaporator for evaporating the refrigerant, the condenser, the condensation zone for condensing the gaseous refrigerant flowing from the compressor to the liquid refrigerant and the supercooled liquid refrigerant passing through the condensation zone And a plurality of heat exchange zones including a subcooling zone, and between the compressor and the condenser, an ejector for mixing a gaseous refrigerant discharged from the compressor and a part of the liquid refrigerant at the outlet side of the subcooling zone of the condenser and supplying the condenser to the condenser is provided. It is characterized by.

The present invention has an ejector (ejector) between the compressor and the condenser in a refrigeration cycle consisting of a compressor, a condenser, an expansion valve, and an evaporator, the high temperature and high pressure gaseous refrigerant discharged from the compressor to the condenser, the high temperature at the outlet side of the condenser By supplying a portion of the high-pressure liquid refrigerant to the condenser, the flow rate of the refrigerant flowing into the condenser is increased to improve the heat dissipation performance according to the increase in the flow rate, thereby improving the efficiency of the air conditioner.

In addition, the hot gaseous refrigerant discharged from the compressor to the condenser is not sent directly to the condenser, but rather by mixing a part of the liquid refrigerant at the outlet side of the condenser, thereby reducing the dryness of the refrigerant flowing into the condenser, thereby reducing the heat load. Since the size can be reduced, the refrigeration cycle can be miniaturized.

In addition, since the boosting function may be utilized through the diffuser of the ejector, the load of the compressor may be reduced to improve the efficiency of the air conditioner.

In addition, the inlet and outlet pipes in which the diffuser part and the suction part of the ejector communicate with each other are installed in a header tank on one side of the condenser, and the ejector is installed between the inlet and outlet pipes and arranged in parallel with the header tank. Can be further reduced.

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

Figure 2 is a block diagram showing a refrigeration cycle of a vehicle air conditioner according to the present invention, Figure 3 is a cross-sectional view showing an ejector in the refrigeration cycle of the vehicle air conditioner according to the present invention, Figures 4 to 6 of the vehicle air conditioner according to the present invention 7 is a view illustrating various installation structures of the ejector and the condenser in the refrigerating cycle, and FIG. 7 is a view illustrating the refrigerant flow of the condenser in the refrigerating cycle of the vehicle air conditioner according to the present invention.

As shown, the refrigeration cycle of the vehicle air conditioner according to the present invention, the compressor 10-> condenser 20-> expansion valve 30-> evaporator 40 is configured by connecting the refrigerant pipe (5) Ejector 50 (ejector) is disposed between the compressor 10 and the condenser 20 in the refrigeration cycle.

First, the compressor (10) is driven by receiving power from a power source (engine or motor, etc.) while driving and condensing the low-temperature low-pressure gaseous refrigerant discharged from the evaporator (40) to a high-temperature high-pressure gas state Discharged to (20).

The condenser 20 heat-exchanges the high-temperature, high-pressure gaseous refrigerant discharged from the compressor 10 with the outside air to condense it into a high-temperature, high-pressure liquid, and discharge it to the expansion valve 30.

Here, if the condenser 20 is briefly described with reference to FIG. 4, the condenser 20 includes a pair of header tanks 21 and 22 which are installed side by side at a predetermined interval from each other, and the pair of Both ends are coupled to the header tanks 21 and 22 so as to partition the plurality of tubes 23 communicating the pair of header tanks 21 and 22 and the plurality of tubes 23 into a plurality of heat exchange areas. A plurality of baffles 25 are installed in the pair of header tanks 21 and 22 spaced apart at regular intervals in the up and down directions, and a heat dissipation fin 24 interposed between the plurality of tubes 23. It is done by

In addition, the one side header tank 21 is provided with an inlet pipe 26 for introducing refrigerant and an outlet pipe 27 for discharging the heat exchanged refrigerant.

In addition, the other header tank 22 is provided with a receiver 28 integrally, such a receiver 28 is the condensed refrigerant in the receiver 28 flows through the plurality of tubes (23) Separating into a gaseous phase and a liquid refrigerant serves to discharge only the liquid refrigerant from the condenser 20.

On the other hand, the plurality of heat exchange zones partitioned by the plurality of baffles 25, the condensation zone for condensing the gaseous refrigerant introduced from the compressor 10 to the liquid refrigerant and the supercooling of the liquid refrigerant passing through the condensation zone It consists of a subcooling zone, which will be described in more detail.
The plurality of heat exchanging zones are configured to cool down the gaseous refrigerant introduced through the inlet pipe 26 to remove overheating and to perform a condensation process. A second condensation region dm2 positioned above the condensation region dm1 for recondensing the refrigerant in the gas phase and a second communication region located above the second condensation region dm2 for recondensing the liquid refrigerant as well as a first communication A third condensation region dm3 which is sent to the receiver 28 through the furnace 29a, and a pre-subcooling region which is located under the superheat removal and first condensation region dm1 to allow the liquid refrigerant to be supercooled. dm4 and a lower portion of the pre-subcooling region dm4 to supercool the refrigerant in the pre-subcooling region dm4 and to send the receiver 20 to the receiver 20 through the second communication path 29b. A subcooling zone dm5 and a lower portion of the first subcooling zone dm5 and a third condensing zone dm3. And a second subcooling zone dm6 that supercools and discharges the liquid refrigerant combined on the receiver 20 side through the first subcooling zone dm5.

Therefore, the refrigerant flow of the condenser 20 is a high-temperature, high-pressure gas phase refrigerant transferred from the compressor 10 as shown in Figure 7 through the inlet pipe 26 to remove the overheat of the condenser 20 and the first condensation region ( As it passes through dm1), some of it changes to liquid phase and some of it remains in gaseous state.

At this time, the refrigerant in the gas phase is active and tries to move upward due to the buoyancy due to the difference in density with the liquid refrigerant, while the liquid refrigerant is lower in the gravity direction due to the higher quality and density than the high viscosity and the gas phase. Will move.

Therefore, the gaseous phase refrigerant among the refrigerant passing through the superheat removal and the first condensation region dm1 is recondensed while passing through the second condensation region dm2, and then passes through the third condensation region dm3. In the third condensation region dm3, the liquid refrigerant is again condensed to have a higher proportion of the liquid refrigerant than the second condensation region dm2, and then flows into the receiver 20 through the first communication path 29a. In), only the liquid refrigerant from which the gas phase is separated falls down.

Subsequently, the liquid refrigerant of the refrigerant passing through the superheat removal and the first condensation region dm1 is overcooled while passing through the pre-subcooling region dm4, and then passes through the first subcooling region dm5, In the first subcooling region dm5, the liquid refrigerant is more subcooled than the pre-subcooling region dm4 and then discharged into the receiver 20 through the second communication path 29b.

Thereafter, the liquid refrigerant discharged to the receiver 20 is joined with the refrigerant passing through the third condensation region dm3, and then the liquid refrigerant is passed through the second subcooling region dm6 at the lowermost end of the condenser 20. It is further subcooled and finally discharged through the outlet pipe 27 to move to the expansion valve 30.

The expansion valve 30 expands rapidly the high temperature and high pressure liquid refrigerant discharged from the condenser 20 by throttling to send it to the evaporator 40 in a low temperature low pressure wet state.

The evaporator 40 cools the air discharged to the room by the endothermic action of the latent heat of evaporation of the refrigerant by exchanging the low pressure liquid refrigerant throttled by the expansion valve 30 with the air blown to the vehicle interior. Done.

Subsequently, by evaporating in the evaporator 40, the low-temperature low-pressure gaseous refrigerant is sucked into the compressor 10 again to recycle the refrigeration cycle as described above.

In addition, in the refrigerant circulation process as described above, the cooling of the vehicle interior evaporates the liquid refrigerant circulating inside the evaporator 40 while the air blown by a blower (not shown) of the vehicle air conditioner passes through the evaporator 40. It is made by discharging the inside of the vehicle in a state of being cooled by latent heat and cooling.

Meanwhile, a receiver dryer (not shown) is installed between the condenser 20 and the expansion valve 30 to separate the refrigerant in the gas phase and the liquid phase so that only the liquid refrigerant may be supplied to the expansion valve 30.

In addition, the ejector 50 is installed between the compressor 10 and the condenser 20, and the high temperature and high pressure gaseous refrigerant discharged from the compressor 10 and a part of the high temperature and high pressure liquid refrigerant discharged from the condenser 20. The mixture is supplied to the condenser 20.

The ejector 50 is composed of a nozzle unit 51, a suction unit 52, and a diffuser unit 53,

The nozzle unit 51 is installed inside the inlet side of the ejector 50 to increase the flow rate of the refrigerant while expanding the refrigerant discharged from the compressor 10 under reduced pressure.

That is, one end of the nozzle unit 51 is connected to the compressor 10 and the refrigerant pipe 5a, and the other end thereof extends a predetermined length into the ejector 50, and the internal flow path of the nozzle unit 51 contracts. The structure is enlarged afterwards.

Accordingly, the high temperature and high pressure gaseous refrigerant discharged from the compressor 10 is accelerated to the supersonic state while passing through the nozzle unit 51, and the pressure of the refrigerant is lowered due to the increased speed. The pressure is lower than the pressure of the outlet refrigerant of the condenser 20 sucked through the 52.

The suction part 52 is formed in communication with the outer circumferential surface of the ejector 50 in which the nozzle part 51 is located and in communication with the outlet refrigerant pipe 5c of the condenser 20 through the refrigerant pipe 5d. Connected.

Therefore, a part of the liquid refrigerant at the outlet side of the condenser 20 is sucked into the ejector 50 through the suction part 52 due to the pressure lowered by the increased speed of the refrigerant injected from the nozzle part 51. At this time, the gaseous refrigerant passing through the nozzle unit 51 and the liquid refrigerant sucked through the suction unit 52 begin to mix with each other.

In addition, the diffuser portion 53 is formed to be extended to the outlet side of the ejector 50 to mix the gaseous refrigerant injected from the nozzle unit 51 and the liquid refrigerant sucked through the suction unit 52. The pressure of the refrigerant is then raised.

As such, the diffuser unit 53 is connected to the condenser 20 and the refrigerant pipe 5b to send the refrigerant boosted by the diffuser unit 53 to the condenser 20.

As such, by disposing the ejector 50 between the compressor 10 and the condenser 20, the outlet of the condenser 20 is discharged from the compressor 10 to the high temperature and high pressure gaseous refrigerant flowing into the condenser 20. By supplying a portion of the liquid refrigerant at the side high temperature and high pressure and supplying it to the condenser 20, the flow rate of the refrigerant flowing into the condenser 20 is increased to improve the heat dissipation performance according to the increase in the flow rate, thereby improving the efficiency of the air conditioner.

In addition, the hot gaseous refrigerant discharged from the compressor 10 and introduced into the condenser 20 is not directly sent to the condenser 20, but partially mixed with the liquid refrigerant at the outlet side of the condenser 20 so as to flow into the condenser 20. The dryness of the refrigerant to be reduced reduces heat load, thereby reducing the size of the condenser 20, thereby miniaturizing the refrigeration cycle.

In addition, since the boosting function may be utilized through the diffuser unit 53 of the ejector 50, the load of the compressor 10 may be reduced to improve the efficiency of the air conditioner.

Meanwhile, the ejector 50 may be installed in various structures on the condenser 20 side as shown in FIGS. 4 to 6.

That is, Figure 4, the diffuser portion 53 of the ejector 50 is installed in communication with the inlet pipe 26 provided in one header tank 21 of the condenser 20,

5, the diffuser portion 53 of the ejector 50 is directly inserted into and coupled to the inside of the one side header tank 21 in communication. 5, the inlet pipe 26 is omitted.

In addition, the suction part 52 of the ejector 50 is installed in communication with the outlet of the subcooling area (subcooling area) of the plurality of heat exchange areas of the condenser 20. That is, the liquid refrigerant passing through the first subcooling zone dm5 and the second subcooling zone dm6, which are the subcooling zone, is installed in communication with the outlet pipe 27.

6 shows that the ejector 50 is installed between the inlet pipe 26 and the outlet pipe 27 installed in one header tank 21 of the condenser 20, the header tank 21. It is arranged side by side along the longitudinal direction of.

As such, the inlet and outlet pipes 26 and 27 communicating with the diffuser portion 53 and the suction portion 52 of the ejector 50 are installed in one header tank 21 and the ejector 50 is provided at the same time. By installing between the inlet and outlet pipes 26, 27 and arranged in parallel with the header tank 21, it is possible to further reduce the installation space.

Hereinafter, the operation of the refrigeration cycle of the vehicle air conditioner according to the present invention will be described.

First, the high-temperature, high-pressure gaseous refrigerant compressed and discharged from the compressor 10 flows into the ejector 50, where the refrigerant expands under reduced pressure while passing through the nozzle part 51 of the ejector 50 and is in a supersonic state. The flow velocity is increased.

Subsequently, the pressure of the refrigerant accelerated to the supersonic speed while passing through the nozzle unit 51 becomes lower than the pressure of the outlet refrigerant of the condenser 20, and thus the liquid phase of the outlet side of the condenser 20 through the suction unit 52. Part of the refrigerant is sucked in.

Accordingly, in the ejector 50, the gaseous refrigerant of the compressor 10 passing through the nozzle unit 51 and a part of the outlet liquid refrigerant of the condenser 20 sucked through the suction unit 52 are mixed. Subsequently, the pressure of the refrigerant is elevated and discharged from the ejector 50 while passing through the diffuser portion 53.

The refrigerant boosted and discharged from the ejector 50 flows into the condenser 20, where the refrigerant flowing into the condenser 20 is increased in the refrigerant flow rate through the ejector 50 and has a reduced dryness. Inflow.

Subsequently, the gaseous refrigerant introduced into the condenser 20 is phase-converted into a high temperature and high pressure liquid refrigerant while condensed through heat exchange with external air, and then flows into the expansion valve 30 to expand under reduced pressure.

The refrigerant expanded under reduced pressure in the expansion valve 30 becomes an atomized state at low temperature and low pressure, and flows into the evaporator 40, and the refrigerant introduced into the evaporator 40 evaporates by exchanging heat with air blown to the vehicle interior. At the same time, the endothermic action by the latent heat of evaporation of the refrigerant cools the air blown into the vehicle interior.

Thereafter, the low temperature low pressure refrigerant discharged from the evaporator 40 is introduced into the compressor 10 to recycle the refrigeration cycle as described above.

1 is a block diagram showing a general refrigeration cycle

2 is a configuration diagram showing a refrigeration cycle of a vehicle air conditioner according to the present invention,

3 is a cross-sectional view showing an ejector in a refrigeration cycle of a vehicle air conditioner according to the present invention;

4 to 6 are views showing various installation structures of the ejector and the condenser in the refrigeration cycle of the vehicle air conditioner according to the present invention,

7 is a view showing the refrigerant flow of the condenser in the refrigeration cycle of the vehicle air conditioner according to the present invention.

<Code Description of Main Parts of Drawing>

10: compressor 20: condenser

30: expansion valve 40: evaporator

50: ejector 51: nozzle unit

52: suction unit 53: diffuser unit

Claims (7)

A compressor (10) for sucking and compressing refrigerant, a condenser (20) for condensing the refrigerant compressed by the compressor (10), an expansion valve (30) for condensing the refrigerant condensed in the condenser (20), and In the refrigeration cycle of the vehicle air conditioner comprising an evaporator 40 for evaporating the refrigerant flowing from the expansion valve 30, The condenser 20 includes a plurality of heat exchange zones including a condensation zone for condensing the gaseous refrigerant introduced from the compressor 10 to the liquid refrigerant and a subcooling zone for supercooling the liquid refrigerant passing through the condensation zone. , Between the compressor 10 and the condenser 20, an ejector for mixing the gas phase refrigerant discharged from the compressor 10 and a part of the liquid refrigerant at the outlet side of the subcooling region of the condenser 20 to supply to the condenser 20 ( Refrigerator cycle of the vehicle air conditioner, characterized in that provided (50). The method of claim 1, The ejector 50 includes a nozzle unit 51 for increasing the flow rate of the refrigerant while decompressing and expanding the refrigerant discharged from the compressor 10 and an increased speed of the refrigerant injected from the nozzle unit 51. The pressure of the refrigerant is mixed after mixing the suction part 52 which sucks a part of the outlet refrigerant of the condenser 20, the refrigerant injected by the nozzle part 51 and the refrigerant sucked through the suction part 52. Refrigeration cycle of a vehicle air conditioner comprising a diffuser unit for boosting. The method of claim 2, The condenser 20 may include a pair of header tanks 21 and 22 installed at regular intervals from each other, and a plurality of tubes 23 installed to communicate the pair of header tanks 21 and 22 with each other. And a plurality of baffles (25) installed inside the pair of header tanks (21, 22) to partition the plurality of tubes (23) into the plurality of heat exchange areas. Refrigeration cycle. The method of claim 3, wherein The diffuser unit 53 of the ejector 50 is installed in communication with the inlet pipe 26 installed in the one header tank 21, the refrigeration cycle of the vehicle air conditioner. The method of claim 3, wherein The diffuser unit 53 of the ejector 50 is installed in communication with the one side header tank 21, the refrigeration cycle of the vehicle air conditioner. The method of claim 3, wherein The suction unit 52 of the ejector 50 is installed in communication with the outlet of the subcooling area of the plurality of heat exchange area, characterized in that the refrigeration cycle of the vehicle air conditioner. The method of claim 3, wherein The ejector 50 is installed between the inlet pipe 26 and the outlet pipe 27 installed in one header tank 21 of the condenser 20 along the longitudinal direction of the header tank 21. Refrigeration cycle of a vehicle air conditioner, characterized in that arranged side by side.

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