KR102111312B1 - Cooling system of air conditioner for vehicle - Google Patents

Abstract

Disclosed is a cooling system for an air conditioning system for a vehicle having an improved piping structure so as to improve a refrigerant flow sound by removing a liquid reservoir in a high temperature refrigerant pipe. The cooling system of the vehicle air conditioning system is composed of a compressor, a condenser, an expansion valve, and an evaporator connected to a refrigerant pipe, and a specific section of a low temperature refrigerant pipe connecting the evaporator and the compressor and a high temperature refrigerant pipe connecting the condenser and the expansion valve. It is composed of a double pipe structure, and includes a double pipe type internal heat exchanger that exchanges heat between the low-temperature refrigerant pipe-side refrigerant and the high-temperature refrigerant pipe-side refrigerant, and the high-temperature refrigerant pipe is a separation pipe part in which the low-temperature refrigerant pipe and the high-temperature refrigerant pipe are separated. The path from to the expansion valve is formed higher than or equal to the inlet side of the expansion valve. Therefore, a high portion by a bending portion is not formed on the liquid flow path, so that the liquid does not accumulate in the high-temperature refrigerant pipe, and the phenomenon that the flow path of the high-temperature refrigerant pipe is narrowed due to the accumulation of liquid is prevented, and eventually gas phase and liquid It is possible to improve the flow of refrigerant by preventing bubbles and vortices caused by the collision.

Description

Air conditioning system for vehicle air conditioning system {COOLING SYSTEM OF AIR CONDITIONER FOR VEHICLE}

The present invention relates to a cooling system of a vehicle air conditioning system, and more particularly, to a cooling system of a vehicle air conditioning system for discharging cold air cooled into a vehicle interior using the principle of a refrigeration cycle.

In general, a vehicle air conditioner is a device for cooling or heating the vehicle interior by heating or cooling in the process of introducing air outside the vehicle into the vehicle interior or circulating air in the vehicle interior. Such a vehicle air conditioner is equipped with an air conditioning system for discharging cold air cooled into the vehicle interior using the principle of a refrigeration cycle.

Korean Patent Application Publication No. 10-2012-0140467 (2012.12.31), filed in advance, discloses a cooling system for a vehicle air conditioner and a method for manufacturing the same. 1 is a block diagram showing a conventional vehicle cooling system, and FIG. 2 is a block diagram showing a case where an internal heat exchanger is installed in a conventional vehicle cooling system.

As shown in FIG. 1, a conventional vehicle cooling system includes a compressor 1 for compressing and sending refrigerant, and a condenser 2 for condensing high-pressure refrigerant sent from compressor 1 , For example, an expansion valve (3) for condensing the liquefied refrigerant condensed in the condenser (2), and air for blowing the low pressure liquid refrigerant throttled by the expansion valve (3) to the vehicle interior. It consists of a refrigeration cycle in which an evaporator (4), etc., which cool the air discharged into the room through the heat absorption by evaporation latent heat of the refrigerant by heat-exchanging and evaporating, are connected by a refrigerant pipe. Cool the car interior.

When the cooling switch (not shown) of the car air conditioning system is turned on, first, the compressor 1 is driven by the power of the engine while sucking and compressing the low-temperature and low-pressure gaseous refrigerant to the condenser 2 in the gas state of the high-temperature and high-pressure. And the condenser 2 exchanges the gaseous refrigerant with outside air to condense it into a high temperature and high pressure liquid. Subsequently, the liquid refrigerant discharged from the condenser 2 in a high temperature and high pressure state is rapidly expanded by the throttling action of the expansion valve 3 and is sent to the evaporator 4 in a low temperature and low pressure wet saturation state, and the evaporator 4 is The refrigerant is exchanged with air blown by a blower (not shown) into the vehicle interior. Accordingly, the refrigerant is evaporated from the evaporator (4), discharged in a low-temperature, low-pressure gas state, and again sucked 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 air blown by a blower (not shown) passes through the evaporator 4 as described above. This is achieved by discharging the vehicle indoors in a cool state.

On the other hand, between the condenser 2 and the expansion valve 3, a receiver dryer (not shown) for separating the vapor phase and the liquid refrigerant is installed to allow only the liquid refrigerant to be supplied to the expansion valve 3. .

The cooling efficiency of the air conditioner having the cooling effect through the refrigeration cycle as described above is determined by various factors, among them, the supercooling of the high pressure refrigerant immediately before being throttled by the expansion valve 3 and the evaporator 4 The superheat of the low-pressure refrigerant discharged from each of them affects the fluidity of the refrigerant and the pressure drop in the evaporator 4 and the overheating area of the evaporator 4 (some areas on the refrigerant outlet side of the evaporator) and the volumetric efficiency of the compressor 1 This will significantly affect the cooling efficiency of the air conditioning system.

For example, when the supercooling degree of the refrigerant increases before throttling, the specific volume of the refrigerant decreases, the refrigerant flow is stabilized, the refrigerant pressure drop in the evaporator 4 decreases, and the cooling efficiency of the air conditioner increases, and the power of the compressor 1 Consumption decreases. On the other hand, if the superheating degree of the low pressure refrigerant discharged from the evaporator 4 is not properly maintained, a relatively high temperature evaporator 4 which is set so that the refrigerant can be completely vaporized to prevent inflow of the compressor 1 of the liquid refrigerant 4 ), The cooling performance of the air conditioning system deteriorates because the overheating area must be expanded.

Therefore, in vehicle air conditioners, in general, when the supercooling degree of the refrigerant increases before being throttled and the superheat degree of the refrigerant discharged from the evaporator 4 is properly maintained, the cooling performance increases.

Accordingly, in order to improve the cooling performance of the vehicle air conditioning system, prior to flowing into the evaporator 4, the supercooled liquid refrigerant of high temperature and high pressure, which is throttled by the expansion valve 3, and the superheat degree of the refrigerant discharged from the evaporator 4 There have been various attempts to optimize the bar. Currently, as shown in FIG. 2, the high-temperature high-pressure liquid refrigerant flowing into the expansion valve 3 and the low-temperature low-pressure gaseous refrigerant discharged from the evaporator 4 are used. The internal heat exchanger 10 is mainly used to supercool the high temperature and high pressure liquid refrigerant before throttling and optimize the superheat degree of the low pressure refrigerant discharged from the evaporator 4 by mutual heat exchange.

The internal heat exchanger (10) exchanges the high temperature high pressure liquid refrigerant before being throttled by the expansion valve (3) and the low temperature low pressure gaseous refrigerant discharged from the evaporator (4) to exchange the flow of refrigerant flowing into the evaporator (4). It stabilizes and reduces the amount of refrigerant pressure drop in the evaporator 4, and is set so that the refrigerant can be completely vaporized to prevent the liquid refrigerant from flowing into the compressor 1. City).

Thus, as shown in FIG. 2, when the internal heat exchanger 10 is employed in the cooling system, the specific volume of the refrigerant flowing into the evaporator 4 is reduced, thereby reducing the amount of refrigerant pressure in the evaporator 4, thereby reducing the evaporator ( 4) Since the refrigerant flow in each cooling tube can be stabilized, and the refrigerant flowing into the compressor (1) can be overheated after being discharged from the evaporator (4), the temperature is relatively high and the cooling performance of the air conditioning system is reduced. It is possible to reduce the overheating area of the evaporator 4, which is a factor of the cooling efficiency of the air conditioning system. As a result, the efficiency of the compressor 1, the condenser 2, and the evaporator 4 can be promoted, thereby contributing to high efficiency and miniaturization of the air conditioning apparatus.

On the other hand, Figure 3 is a cross-sectional view showing a conventional double-tube internal heat exchanger, Figure 4 is a perspective view showing a vehicle cooling system having a conventional double-tube internal heat exchanger, Figure 5 is a "a" portion of Figure 4 It is a cross section.

3 and 4, the internal heat exchanger 10 is a double-tube internal heat exchanger, a low temperature refrigerant pipe 5 connecting the evaporator 4 and the compressor 1, and a condenser 2 and expansion The specific section of the high-temperature refrigerant pipes 6a, 6b connecting the valves 3 is constituted by a double pipe structure to heat exchange refrigerants flowing through each refrigerant pipe.

In this case, a specific section of the low-temperature refrigerant pipe (5) connecting the evaporator (4) and the compressor (1) is helically formed to form the inner tube (5a), and a circular pipe is formed on the outer circumferential surface of the inner tube (5a). The outer tube 11 is configured by combining in a structure. The high-temperature and high-pressure liquid refrigerant discharged from the condenser 2 flows into the outer tube 11 through the hot refrigerant pipe 6a, and the refrigerant flowing into the outer tube 11 has an outer tube 11 and an inner tube 5a. ) Flows along a plurality of helical flow paths formed between, and moves to the expansion valve 3 through the high-temperature refrigerant pipe 6b. In addition, the low-temperature, low-pressure gaseous refrigerant discharged from the evaporator 4 passes inside the inner tube 5a, and the refrigerant passing through the inner tube 5a and the refrigerant passing through the outer tube 11 exchange heat with each other. . Then, the refrigerant that has passed through the inner tube 5a flows into the compressor 1.

However, as shown in FIG. 5, when the cooling system is turned off, the liquid remaining in the high-temperature refrigerant pipe 6b is accumulated in the piping bending part and remains, thereby narrowing the passage and preventing gas flow. do. That is, the liquid remaining in the high-temperature refrigerant pipe 6b is accumulated, and when the cooling system is turned on, the gas flow and the liquid flow through the bending part, and the gas flow is interrupted. Accordingly, there was a problem in that the durability of the pipe was lowered and vortex noise was generated.

Republic of Korea Patent Publication No. 10-2012-0140467 (2012.12.31)

In order to solve such a conventional problem, the present invention provides a cooling system for an air conditioning system for a vehicle having an improved piping structure to improve a refrigerant flow noise by removing a liquid reservoir in a high temperature refrigerant pipe.

The cooling system of the vehicle air conditioning system according to the present invention is composed of a compressor, a condenser, an expansion valve, and an evaporator connected to a refrigerant pipe, a low temperature refrigerant pipe connecting the evaporator and the compressor, and a high temperature refrigerant pipe connecting the condenser and the expansion valve. It consists of a double pipe structure of a specific section of, and includes a double pipe type internal heat exchanger that heat-exchanges the refrigerant on the side of the low-temperature refrigerant pipe and the refrigerant on the side of the high-temperature refrigerant pipe, and the high-temperature refrigerant pipe is continuously horizontal from the separation pipe portion to the expansion valve It has a horizontal or raised holding section extending in a direction or extending in a rising direction.

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In the above, the horizontal or raised holding section: a first curved rising section provided on a side adjacent to the separation pipe portion and bent in a lateral direction; A second bending upward section provided on a side adjacent to the expansion valve and bent in a lateral direction; And a straight rising section extending from the first bending rising section to the second bending rising section.

In the above, the horizontal or raised holding section includes: a vertical raised section extending in a vertical direction from the separation pipe; And a horizontal section extending in a horizontal direction from the vertical rising section to the inlet side of the expansion valve.

The cooling system of the air conditioning system for a vehicle according to the present invention does not form a high portion by a bending part on a liquid flow path, so that the liquid does not accumulate in the high temperature refrigerant pipe, and the flow path of the high temperature refrigerant pipe due to the accumulation of liquid becomes narrow The phenomenon is prevented, and in the end, bubbles and vortices caused by the collision of the gas phase and the liquid phase can be prevented to improve the refrigerant flow sound.

1 is a block diagram showing a conventional vehicle cooling system,
2 is a block diagram showing a case where an internal heat exchanger is installed in a conventional vehicle cooling system,
Figure 3 is a cross-sectional view showing a conventional double-tube internal heat exchanger,
Figure 4 is a perspective view showing a vehicle cooling system having a conventional double-tube internal heat exchanger,
Figure 5 is a cross-sectional view showing a portion "a" of Figure 4,
6 is a perspective view showing a cooling system of a vehicle air conditioner according to an embodiment of the present invention,
7 is an enlarged perspective view of a portion “b” of FIG. 6,
8 is a cross-sectional view showing a portion “b” of FIG. 6,
9 is a perspective view showing a part of the cooling system of the vehicle air conditioning apparatus according to the modified example of FIG. 7,
10 is a cross-sectional view of FIG. 9.

Hereinafter, the technical configuration of the cooling system of the vehicle air conditioning system according to the accompanying drawings will be described in detail as follows.

6 is a perspective view showing a cooling system of a vehicle air conditioner according to an embodiment of the present invention, FIG. 7 is a perspective view showing an enlarged portion “b” of FIG. 6, and FIG. 8 is a portion “b” of FIG. 6 It is a sectional view showing.

6 to 8, the cooling system of the vehicle air conditioning system according to an embodiment of the present invention includes a compressor 100, a condenser 200, a double-tube internal heat exchanger 500, and an expansion valve ( 300) and the evaporator 400 is connected to a refrigerant pipe. The refrigerant circulates sequentially through the compressor 100, the condenser 200, the double-tube internal heat exchanger 500, the expansion valve 300, and the evaporator 400.

Compressor (100) is driven by receiving power from a power supply source (engine or motor, etc.) while driving, inhaling and compressing the low-temperature and low-pressure gaseous refrigerant discharged from the evaporator 400, and condenser 200 in a high-temperature and high-pressure gas state. To discharge. The condenser 200 condenses the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 100 to external air and condenses it into a high-temperature and high-pressure liquid and discharges it to the expansion valve 300.

The expansion valve 300 rapidly expands the high-temperature, high-pressure liquid refrigerant discharged from the condenser 200 by throttling, and sends it to the evaporator 400 in a low-temperature, low-pressure wet-saturation state. The evaporator 400 cools the air discharged into the room by absorbing heat by evaporating latent heat of the refrigerant by heat-exchanging the low-pressure liquid refrigerant throttled by the expansion valve 300 with air blown to the vehicle interior.

Evaporation in the evaporator 400, the low-temperature, low-pressure gaseous refrigerant is sucked into the compressor 100 again to recycle the cycle as described above. In addition, in the refrigerant circulation process as described above, the cooling of the vehicle interior is evaporation of the liquid refrigerant circulating inside the evaporator 400 while air blown by a blower (not shown) of the vehicle air conditioning device passes through the evaporator 400. It is made by cooling with latent heat and discharging it into the vehicle interior in a cool state.

In addition, the double-tube internal heat exchanger 500 is characterized by the low temperature refrigerant pipe 701 connecting the evaporator 400 and the compressor 100 and the high temperature refrigerant pipe 703 connecting the condenser 200 and the expansion valve 300. The section is composed of a double tube structure, and heat exchanges between the low-temperature refrigerant pipe 701 side refrigerant and the high-temperature refrigerant pipe 703 side refrigerant. More specifically, the double-tube internal heat exchanger 500 constitutes an inner tube (not shown) by spirally forming a specific section of the low-temperature refrigerant pipe 701 connecting the evaporator 400 and the compressor 100, The outer pipe 510 is configured by combining a circular pipe on the outer circumferential surface of the inner pipe in a double pipe structure.

Low temperature refrigerant flowing from the evaporator 400 to the compressor 100 flows to the inner tube, and high temperature refrigerant flowing from the condenser 200 to the expansion valve 300 flows to the outer tube 510. Both ends of the outer tube 510 are sealed by a method such as welding with the outer circumferential surface of the low temperature refrigerant pipe 701. In addition, separation pipe portions 511 and 512 are formed at both ends of the outer tube 510 to separate the low-temperature refrigerant pipe 701 and the high-temperature refrigerant pipe 703.

In detail, the high-temperature refrigerant pipe 703 has a horizontal or raised holding section. The horizontal or raised holding section extends continuously from the separation pipe part 512 to the expansion valve 300 in the horizontal direction, or extends in the rising direction. More specifically, the horizontal or rising maintenance section has a horizontal section, a rising section, or both a horizontal section and a rising section. That is, the flow path section from one side of the high temperature refrigerant pipe 703 adjacent to the separation pipe part 512 side to the other side of the high temperature refrigerant pipe 703 adjacent to the expansion valve 300 side is configured to be horizontal or raised, You can get rid of the high waist. Through such a configuration, the high-temperature refrigerant pipe 703 is not formed on the flow path of the liquid flowing through the bent portion, so that the liquid does not accumulate on the high-temperature refrigerant pipe 703. Therefore, the phenomenon that the flow path of the high-temperature refrigerant pipe 703 due to the accumulation of liquid is narrowed is prevented, and in the end, bubbles and vortices caused by the collision of the gas phase and the liquid phase can be prevented to improve the refrigerant flow sound.

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The horizontal or raised holding section is composed of a first curved rising section 7031, a second curved rising section 7033, and a straight rising section 7032. The first bend rising section 7031 is provided on a side adjacent to the separation pipe part 512 and is bent in the lateral direction. The separation pipe part 512 and the expansion valve 300 are positioned not to be parallel to the vertical direction and the lateral direction due to a limitation in the installation space of the vehicle. Therefore, in order to connect the separation pipe part 512 and the expansion valve 300, bend sections must be performed. Should be equipped.

In this case, the first bending upward section 7031 is bent once in the lateral direction as it rises from the separation pipe part 512, and rises in a straight line in the straight upward section 7302, in the second bending upward section 7033 As it rises and extends in one direction in the lateral direction, it is possible to form from the separation pipe part 512 to the expansion valve 300 without a high part by the bending part, while having a minimum bend part.

9 is a perspective view showing a part of a cooling system of a vehicle air conditioner according to a modified example of FIG. 7, and FIG. 10 is a cross-sectional view of FIG. 9.

9 and 10, the cooling system of the vehicle air conditioner according to the modified example of FIG. 7 includes a vertical rise section 7034 and a horizontal section 7035 in which a horizontal or raised maintenance section is vertical.

The vertical rise section 7034 extends from the separation pipe portion 512 in the vertical direction. The horizontal section 7035 is formed to extend in the horizontal direction from the vertical rising section 7034 to the inlet side of the expansion valve 300. Through this configuration, the liquid in the high-temperature refrigerant pipe 703 falls from the connecting portion of the vertical rise section 7034 and the horizontal section 7035 to the separation pipe portion 512, thereby effectively preventing the liquid from accumulating.

So far, the cooling system of the vehicle air conditioning system according to the present invention has been described with reference to the embodiment shown in the drawings, but this is only exemplary, and anyone skilled in the art can understand that various modifications and equivalent other embodiments are possible therefrom. will be. Therefore, the true technical protection scope should be determined by the technical spirit of the appended claims.

100: compressor 200: condenser
300: expansion valve 400: evaporator
500: double tube inner heat exchanger 510: outer tube
512: separating pipe portion 701: low temperature refrigerant pipe
703: high temperature refrigerant pipe 7031: first bend rising section
7032: Linear ascent section 7033: Second bend ascent section
7034: vertical rise section 7035: horizontal section

Claims (4)

delete Compressor 100, condenser 200, expansion valve 300, is configured by connecting the evaporator 400 with a refrigerant pipe, the low-temperature refrigerant pipe 701 connecting the evaporator 400 and the compressor 100 and the The specific section of the high temperature refrigerant pipe (703) connecting the condenser (200) and the expansion valve (300) consists of a double tube structure. In the cooling system of the air conditioning system for a vehicle comprising a double-tube internal heat exchanger 500 for heat exchange,
The high temperature refrigerant pipe 703,
It is provided with a horizontal or upward holding section extending from the separation pipe part 512 where the low temperature refrigerant pipe 701 and the high temperature refrigerant pipe 703 are separated to the expansion valve 300 continuously extending in the horizontal direction or extending in the rising direction,
The horizontal or raised holding section is:
A first bend upward section 7031 provided on a side adjacent to the separation pipe part 512 and bent in a lateral direction;
A second bending upward section 7033 provided on a side adjacent to the expansion valve 300 and bent in a lateral direction; And
A cooling system of an air conditioning apparatus for a vehicle, characterized in that it comprises a straight ascending section (7032) extending from the first bend ascending section (7031) to the second bend ascending section (7033). delete Compressor 100, condenser 200, expansion valve 300, is configured by connecting the evaporator 400 with a refrigerant pipe, the low-temperature refrigerant pipe 701 connecting the evaporator 400 and the compressor 100 and the The specific section of the high temperature refrigerant pipe (703) connecting the condenser (200) and the expansion valve (300) consists of a double tube structure. In the cooling system of the air conditioning system for a vehicle comprising a double-tube internal heat exchanger 500 for heat exchange,
The high temperature refrigerant pipe 703,
It is provided with a horizontal or upward holding section extending from the separation pipe part 512 where the low temperature refrigerant pipe 701 and the high temperature refrigerant pipe 703 are separated to the expansion valve 300 continuously extending in the horizontal direction or extending in the rising direction,
The horizontal or raised holding section is:
A vertical elevation section 7034 extending in a vertical direction from the separation pipe part 512; And
Cooling system of a vehicle air conditioning apparatus, characterized in that it consists of a horizontal section (7035) extending in the horizontal direction from the vertical rising section (7034) to the inlet side of the expansion valve (300).

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