KR20100128515A - Cooling system of air conditioner for vehicle - Google Patents

Abstract

PURPOSE: A cooling system of an air conditioner for a vehicle is provided to reduce the vibration of an engine and a compressor which is transmitted to a liquid refrigerant pipe through a suction refrigerant pipe and an internal heat exchanger. CONSTITUTION: A cooling system of an air conditioner for a vehicle comprises a compressor(10), a condenser(20), an expansion valve(30), an evaporator(40), and a double pipe type internal heat exchanger(50). The compressor draws in and compresses refrigerant. The condenser condenses the compacted refrigerant. The expansion valve throttles the condensed refrigerant. The evaporator evaporates the refrigerant flowing in from the expansion valve. The double pipe type internal heat exchanger exchanges heat between the suction refrigerant pipe and the liquid refrigerant pipe. The liquid refrigerant pipe and the suction refrigerant pipe are connected by a bracket(60).

Description

Cooling system of air conditioner for vehicle

The present invention relates to a cooling system for a vehicle air conditioner, and more particularly, by connecting and fixing a condenser side liquid refrigerant pipe connected to a double tube internal heat exchanger to a suction refrigerant pipe side through a bracket, so that vibrations of the engine and the compressor are suction refrigerant. The present invention relates to a cooling system for a vehicle air conditioner that attenuates transmission to a liquid refrigerant pipe through a pipe and an internal heat exchanger, thereby preventing damage to the liquid refrigerant pipe due to vibration and improving durability.

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, a cooling system of such an air conditioner has a compressor (1) for compressing and delivering a refrigerant as shown in FIG. 1, and a condenser (condenser) for condensing a high-pressure refrigerant from the compressor (1). 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 for cooling the air discharged to the room by the endothermic action of the latent heat of the refrigerant by evaporating by heat exchange with the air is composed of a refrigeration cycle consisting of a refrigerant pipe. 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. It is made by discharging the inside of the vehicle in the cold state.

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

As described above, the cooling efficiency of the air conditioner that provides cooling through the refrigerating cycle is determined by various factors. Among them, the subcooling of the high-pressure refrigerant immediately before being throttled by the expansion valve 3 and the evaporator 4 The superheat degree of the low pressure refrigerant discharged from the gas can affect the refrigerant fluidity, the amount of pressure drop in the evaporator 4, the superheated region of the evaporator 4 (partial region of the refrigerant outlet side of the evaporator), and the volumetric efficiency of the compressor 1, respectively. It has a significant influence on the cooling efficiency of the air conditioning system.

For example, if the subcooling of the refrigerant before the condensation increases, the specific volume of the refrigerant is reduced, the refrigerant flow is stabilized, and the refrigerant pressure drop in the evaporator 4 is reduced, so that the cooling efficiency of the air conditioner is increased and the power of the compressor 1 is increased. Consumption is reduced. On the other hand, if the superheat degree of the low pressure refrigerant discharged from the evaporator 4 is not properly maintained, the relatively high temperature evaporator 4 is set such that the refrigerant can be completely vaporized to prevent the refrigerant 1 from entering the compressor 1. Since the overheating zone of) must be enlarged, the cooling performance of the air conditioner is reduced.

Therefore, the vehicle air conditioners generally increase the cooling performance if the supercooling degree of the refrigerant before being throttled and the superheating degree of the refrigerant discharged from the evaporator 4 are maintained.

Accordingly, in order to improve the cooling performance of the vehicle air conditioner, the supercooling of the high temperature and high pressure liquid refrigerant throttled by the expansion valve 3 before entering the evaporator 4 and the degree of superheat of the refrigerant discharged from the evaporator 4 are achieved. Various attempts have been made to optimize the bar, and now, as shown in FIG. 2, the high temperature and high pressure liquid refrigerant flowing into the expansion valve 3 and the low temperature low pressure gaseous refrigerant discharged from the evaporator 4 are provided. The internal heat exchanger 10 which supercools the high-temperature, high-pressure liquid refrigerant before throttling and optimizes the superheat degree of the low-pressure refrigerant discharged | emitted from the evaporator 4 by mutual heat exchange is mainly used.

The internal heat exchanger (10) exchanges heat between the high temperature and high pressure liquid refrigerant before being throttled by the expansion valve (3) and the low temperature and low pressure gas phase refrigerant discharged from the evaporator (4), thereby preventing the flow of the refrigerant flowing into the evaporator (4). It stabilizes and reduces the amount of refrigerant pressure drop in the evaporator 4, and the refrigerant can be completely vaporized to prevent the introduction of the liquid refrigerant into the compressor 1 so that the temperature of the evaporator 4 is relatively high. It is possible to reduce the time).

Therefore, when the internal heat exchanger 10 is employed in the cooling system as shown in FIG. 2, the specific volume of the refrigerant flowing into the evaporator 4 is reduced, so that the amount of refrigerant pressure drop in the evaporator 4 is reduced, so that the evaporator 4 is reduced. The refrigerant flow in each cooling tube can be stabilized, and the refrigerant flowing into the compressor 1 can be superheated after being discharged from the evaporator 4, so that the temperature is relatively high, thereby reducing the cooling performance of the air conditioning system. The overheating area of the evaporator 4, which is a factor, can be reduced, which can greatly increase the cooling efficiency of the air conditioner. As a result, the compressor 1, the condenser 2, and the evaporator 4 can be made efficient, contributing to the high efficiency and miniaturization of the air conditioning apparatus.

3 is a view showing an example of the internal heat exchanger 10, as shown, the internal heat exchanger 10 is a double tube internal heat exchanger, the suction for connecting the evaporator 4 and the compressor 1 ( Suction) The refrigerant pipe (5), the specific section of the liquid (liquid) refrigerant pipe (6a, 6b) connecting the condenser (2) and expansion valve (3) in a double pipe structure to the refrigerant flowing through each refrigerant pipe Heat exchange.

That is, a specific section of the suction refrigerant pipe 5 connecting the evaporator 4 and the compressor 1 is helically formed to form an inner tube 5a, and a circular pipe is formed on the outer circumferential surface of the inner tube 20. The outer pipe 11 is configured by combining in a double pipe structure.

At this time, the liquid refrigerant pipe 6a connected to the condenser 2 is welded to the inlet side of the outer tube 11, and the liquid refrigerant pipe 6b connected to the expansion valve 3 is welded to the outlet side. do.

Therefore, the high temperature and high pressure liquid refrigerant discharged from the condenser 2 is introduced into the outer tube 11 through the liquid refrigerant pipe 6a, and the refrigerant introduced into the outer tube 11 is the outer tube ( After flowing along the plurality of spiral high pressure flow paths formed between 11) and the inner pipe 5a, the liquid refrigerant pipe 6b moves to the expansion valve 3.

In addition, the low-temperature low-pressure gaseous refrigerant discharged from the evaporator 4 passes through the inner tube 5a, wherein the refrigerant passing through the inner tube 5a and the refrigerant passing through the outer tube 11 are transferred. Will exchange heat with each other.

Thereafter, the refrigerant passing through the inner tube 5a flows into the compressor 1.

However, the double tube internal heat exchanger 10 includes a suction refrigerant pipe 5 connecting the evaporator 4 and the compressor 1 and a liquid refrigerant pipe connecting the condenser 2 and the expansion valve 3. Since the 6a and 6b are formed in a double pipe structure, the vibration of the engine and the compressor 1 is transmitted to the liquid refrigerant pipes 6a and 6b through the suction refrigerant pipe 5 and the internal heat exchanger 10. Therefore, the liquid refrigerant pipe 6a on the condenser 2 side close to the engine and the compressor 1 has a problem in that the durability of the liquid refrigerant pipe 6a is damaged due to vibration, such that the welding part with the internal heat exchanger 10 is broken.

An object of the present invention for solving the above problems is to connect the fixed refrigerant pipe of the condenser side connected to the double pipe internal heat exchanger to the suction refrigerant pipe side through the bracket, so that the vibration of the engine and the compressor is reduced by the suction refrigerant pipe and the internal heat exchanger The present invention provides a cooling system for an air conditioner for a vehicle that attenuates transmission to the liquid refrigerant pipe through the liquid, thereby preventing damage to the liquid refrigerant pipe due to vibration and improving durability.

The present invention for achieving the above object, a compressor for sucking and compressing the refrigerant; A condenser for condensing the refrigerant compressed by the compressor; An expansion valve for condensing the refrigerant condensed in the condenser; An evaporator for evaporating the refrigerant flowing from the expansion valve; It comprises a double pipe internal heat exchanger configured to heat exchange the refrigerant flowing through each refrigerant pipe by configuring a specific section of the suction refrigerant pipe connecting the evaporator and the compressor and the liquid refrigerant pipe connecting the condenser and the expansion valve in a double pipe structure. In the cooling system of a built-in air conditioner for a vehicle, a bracket for connecting and fixing the liquid refrigerant pipe and the suction refrigerant pipe is installed so as to improve the durability of the liquid refrigerant pipe.

According to the present invention, the condenser-side liquid refrigerant pipe connected to the double tube internal heat exchanger is fixed to the suction refrigerant pipe side through a bracket, so that vibrations of the engine and the compressor are transferred to the liquid refrigerant pipe through the suction refrigerant pipe and the internal heat exchanger. Attenuation prevents damage to the connection portion (welding portion) of the liquid refrigerant pipe due to vibration and improves durability.

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

Figure 4 is a block diagram showing a cooling system of a vehicle air conditioner according to the present invention, Figure 5 is a perspective view showing a state in which the liquid refrigerant pipe and suction refrigerant pipe fixed in the cooling system of the vehicle air conditioner according to the invention, Figure 6 5 is a cross-sectional view showing a double-tube internal heat exchanger in Figure 5, Figure 7 is a perspective view showing a bracket in a cooling system of a vehicle air conditioner according to the present invention.

The air conditioning system for a vehicle air conditioner according to the present invention is configured by connecting a compressor (10)-> condenser (20)-> internal heat exchanger (50)-> expansion valve (30)-> evaporator (40) with refrigerant pipes.

First, the compressor (10) is driven by receiving power from a power supply source (engine or motor, etc.) while sucking and compressing the low-temperature, low-pressure gaseous refrigerant discharged from the evaporator 40, thereby compressing the gas at high temperature and high pressure. To the condenser 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.

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 again sucked into the compressor 10 to recycle the 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.

In addition, the internal heat exchanger 50 includes a suction refrigerant pipe P1 connecting the evaporator 40 and the compressor 10 and a liquid connecting the condenser 20 and the expansion valve 30. Particular sections of the refrigerant pipes P2 and P3 are formed in a double pipe structure to exchange heat between the refrigerant flowing through the refrigerant pipes.

That is, a specific section of the suction refrigerant pipe P1 connecting the evaporator 40 and the compressor 10 is formed in a spiral shape to form an inner tube 55, and a circular pipe is formed on an outer circumferential surface of the inner tube 55. The outer pipe 51 is configured by combining in a double pipe structure.

At this time, both ends of the outer tube 51 is sealed with the outer circumferential surface of the suction refrigerant pipe (P1) by welding or the like.

In addition, a liquid refrigerant pipe P2 connected to the condenser 20 is welded to the inlet 52a of the outer tube 51, and a liquid refrigerant pipe connected to the expansion valve 30 to the outlet 52b. P3) is joined by welding.

On the other hand, the expansion pipe 52 is formed at the inlet and outlet 52a and 52b sides of the outer tube 51 to enlarge the refrigerant flow path at the inlet and outlet 52a and 52b sides of the outer tube 51, thereby The flow path cross-sectional area of the inlet 52a side and the outlet 52b side of the pipe 51 is increased to reduce the pressure loss of the refrigerant when the refrigerant flows into the outer tube 51 or when the refrigerant is discharged from the outer tube 51. Will be minimized.

In addition, the present invention is provided with a bracket 60 for connecting and fixing the liquid refrigerant pipe (P2) and suction refrigerant pipe (P1) to improve the durability of the liquid refrigerant pipe (P2).

Here, the bracket 60 is connected to and fixed to the liquid refrigerant pipe (P2) and the suction refrigerant pipe (P1) connecting the condenser 20 and the internal heat exchanger (50).

That is, in the case of the liquid refrigerant pipe P2 connecting the condenser 20 and the internal heat exchanger 50, the length of the liquid refrigerant pipe P2 needs to be fixed through the bracket 60, and the expansion valve 30 and the internal heat exchanger are required. In the case of the liquid refrigerant pipe P3 connecting 50, the length of the liquid refrigerant pipe P3 is short, and the bracket 60 may be omitted. Of course, if the length of the liquid refrigerant pipe (P3) connecting the expansion valve 30 and the internal heat exchanger (50) is long, it will be necessary to install the bracket 60 here.

The bracket 60 is installed at a predetermined interval from the inlet 52a of the outer tube 51 of the internal heat exchanger 50 to which the condenser-side liquid refrigerant pipe P2 is connected. In this case, the bracket 60 Silver is preferably provided within 200 mm from the inlet 52a of the outer tube 51.

That is, when the bracket 60 is installed over 200mm from the inlet 52a of the outer tube 51, the bracket 60 is too far from the welded portion of the liquid refrigerant pipe P2, and the engine and the compressor 10 through the bracket 60. The vibration damping effect is reduced, the durability can be reduced.

Therefore, by installing the bracket 60 within 200 mm from the inlet 52a of the outer tube 51, the liquid refrigerant pipe P2 on the condenser 20 side can be fixed more efficiently, and thus the liquid refrigerant pipe P2. ) Will prevent damage and improve durability.

On the other hand, as the bracket 60 is installed closer to the welded portion of the liquid refrigerant pipe P2 and the outer tube 51, it is possible to further prevent damage to the welded portion due to vibration.

In addition, the bracket 60 may be integrally formed on one side of the first coupling part 61 and one side of the first coupling part 61 coupled to surround the outer circumferential surface of the suction refrigerant pipe P1. And one side of the second coupling part 62 coupled to surround the outer circumferential surface of the liquid refrigerant pipe P2.

In this case, the opening part 61a of the first coupling part 61 and the opening part 62a of the second coupling part 62 may be formed to face in the same direction or may be formed to face in opposite directions to each other. have.

In addition, when the opening portions 61a and 62a of the first and second coupling portions 61.62 are assembled to the outer circumferential surfaces of the suction refrigerant pipe P1 and the liquid refrigerant pipe P2, the opening portions 61a and 62a are elastic. When the assembly is completed and the assembly is completed, the openings (61a, 62a) is elastically wrapped around the outer circumferential surface of the suction refrigerant pipe (P1) and the liquid refrigerant pipe (P2) it is possible to be firmly fixed.

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

First, the high temperature / high pressure gaseous refrigerant compressed by the compressor 10 is discharged into the condenser 20, and the gaseous refrigerant introduced into the condenser 20 is condensed through heat exchange with external air. After the phase change to a high-pressure liquid refrigerant, it is introduced into the outer tube 51 of the internal heat exchanger 50 through the liquid refrigerant pipe P2 on the inlet 52a side of the outer tube 51.

The high temperature / high pressure refrigerant introduced into the outer tube 51 is discharged from the evaporator 40 in the course of flowing the outer tube 51 and mutually exchanges with the low temperature / low pressure refrigerant flowing in the inner tube 55. After performing, the inlet 52b is introduced into the expansion valve 30 through the liquid refrigerant pipe P3 on the outlet 52b side and is decompressed / expanded.

The refrigerant depressurized / expanded in the expansion valve 30 becomes a low temperature / low pressure atomization state 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 air blown into the vehicle interior is cooled by an endothermic action caused by latent heat of evaporation of the refrigerant.

Thereafter, the low temperature / low pressure refrigerant discharged from the evaporator 40 mutually exchanges heat with the high temperature / high pressure refrigerant flowing through the outer tube 51 in the process of flowing the inner tube 55 of the internal heat exchanger 50. After performing the flow into the compressor (10).

In the refrigerant circulation process as described above, the vibration of the engine and the compressor 10 is transmitted to the internal heat exchanger 50 through the suction refrigerant pipe P1 and the vibration is connected to the liquid refrigerant pipe P2 connected to the outer tube 51. Is delivered to the side, in this case by reducing the vibration transmitted to the liquid refrigerant pipe (P2) by a bracket 60 for firmly fixing the liquid refrigerant pipe (P2) and suction refrigerant pipe (P1) liquid refrigerant pipe by vibration It prevents damage to the connection part (welding part) of (P2) and improves durability.

1 is a block diagram showing a general vehicle cooling system,

2 is a block diagram showing a case in which an internal heat exchanger is installed in a general vehicle cooling system;

3 is a cross-sectional view showing an example of a conventional double tube internal heat exchanger;

4 is a configuration diagram showing a cooling system of a vehicle air conditioner according to the present invention;

5 is a perspective view illustrating a state in which a liquid refrigerant pipe and a suction refrigerant pipe are fixed by brackets in a cooling system of a vehicle air conditioner according to the present invention;

6 is a cross-sectional view showing a double tube internal heat exchanger in FIG.

7 is a perspective view showing a bracket in a cooling system of a 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: internal heat exchanger 51: outer tube

52: expansion tube 55: inner tube

60: bracket 61: first coupling portion

62: second coupling portion P1: suction refrigerant pipe

P2, P3: liquid refrigerant pipe

Claims (4)

A compressor 10 for sucking and compressing a refrigerant; A condenser 20 for condensing the refrigerant compressed by the compressor 10; Expansion valve 30 for throttling the refrigerant condensed in the condenser 20; An evaporator (40) for evaporating the refrigerant flowing from the expansion valve (30); Suction refrigerant pipe connecting the evaporator 40 and the compressor 10 and a specific section of the liquid refrigerant pipe connecting the condenser 20 and the expansion valve 30 in a double pipe structure refrigerant flowing through each refrigerant pipe In the cooling system of a vehicle air conditioner comprising a double tube type internal heat exchanger (50) for mutual heat exchange, Cooling system for a vehicle air conditioner, characterized in that the bracket (60) for connecting and fixing the liquid refrigerant pipe and suction refrigerant pipe so as to improve the durability of the liquid refrigerant pipe. The method of claim 1, The bracket (60) is a cooling system of a vehicle air conditioner, characterized in that spaced apart a predetermined interval from the inlet (52a) of the internal heat exchanger 50 is connected to the liquid refrigerant pipe of the condenser 20 side. The method according to claim 1 or 2, The bracket 60 has a first coupling part 61 coupled to surround an outer circumferential surface of the suction refrigerant pipe with one side open, and is integrally formed with one side of the first coupling part 61 and one side is opened. Cooling system of a vehicle air conditioner, characterized in that consisting of a second coupling portion (62) coupled to surround the outer circumferential surface of the liquid refrigerant pipe. The method of claim 1, The internal heat exchanger (50) is coupled to the inner tube (55) formed in a specific section of the suction refrigerant pipe connecting the evaporator (40) and the compressor (10), and the double tube structure on the outer circumferential surface of the inner tube (55). In addition, the inlet 52a side is connected to the liquid refrigerant pipe connected to the condenser 20, and the outlet 52b side is formed of an outer tube 51 connected to the liquid refrigerant pipe connected to the expansion valve 30. Air conditioning system for vehicle.

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