KR100737158B1 - Fitting structure for pipe flange of a refrigeration cycle system with internal heat exchanger - Google Patents

Abstract

A connecting structure for a pipe flange of a cooling cycle system having an internal heat exchanger is provided to improve airtightness of a connecting structure by using coupling protrusions. A connecting structure for a pipe flange of a cooling cycle system having an internal heat exchanger(4) includes a main block(20), a first flange block(30), a first coupling unit(62), a second flange block(40), and a second coupling unit(64). The first flange block is contacted and coupled to one side(20a) of the main block by the first coupling unit. The second flange block is contacted and coupled to an other side(20b) of the main block by the second coupling unit. A low pressure inlet pipe(4a) and a high pressure outlet pipe(4b) of the internal heat exchanger are welded on an other side of the main block.

Description

Fitting structure for pipe flange of a refrigeration cycle system with internal heat exchanger}

1 is a refrigerant circuit diagram of a refrigeration cycle system having an internal heat exchanger;

2 is a schematic diagram showing a pipe flange connection structure between a conventional internal heat exchanger and an evaporator and a gas-liquid separator in a refrigeration cycle system having an internal heat exchanger;

3 is a schematic configuration diagram showing a pipe flange connection structure of a refrigeration cycle system having an internal heat exchanger to which the present invention is applied;

4 is a perspective view showing a pipe flange connection structure of a refrigeration cycle system having an internal heat exchanger to which the present invention is applied;

5 is an exploded perspective view of FIG. 4;

FIG. 6 is an elevation view seen from one side of the main block in a state in which the second flange block is coupled and the first flange block is removed in FIG. 5;

7 is a cross-sectional view of the engaging projection formed in the main block of FIG.

8 is a cross-sectional view of the first flange block of FIG. 5;

9 is a cross-sectional view showing a high pressure outlet pipe and a low pressure inlet pipe of the second flange block and the internal heat exchanger in FIG. 4;

10 is a cross-sectional view showing the sealing member of FIG. 5;

11 is a perspective view showing a structure in which the sealing member of the present invention is assembled to the engaging projection;

12 is a cross-sectional view of the projection coupling groove formed in the main block of FIG.

13 is a cross-sectional view and a plan view of a second flange sub-mail block of the second flange block in FIG. 5;

14 is a cross-sectional view and a plan view of a second flange mail block of the second flange block in FIG. 5.

<Description of Major Symbols in Drawing>

4: internal heat exchanger 5: expansion device

6: evaporator 7: gas-liquid separator

20: main block 30: first flange block

40: second flange block 50: sealing member

62, 64: first and second fastening means 70: engaging projection

80: second flange sub-mail block 90: second flange mail block

The present invention relates to a pipe flange connection structure of a refrigeration cycle system having an internal heat exchanger, and more particularly, to a pipe flange connection structure between an internal heat exchanger and an evaporator and a gas-liquid separator in a refrigeration cycle system having an internal heat exchanger.

In general, a car can keep the indoors contaminated by the passenger's breathing, outdoor atmosphere, or external temperature change in a fresh state, or by cooling and heating the room temperature to maintain a comfortable temperature for the passenger's body. An air conditioning system is installed. Such an air conditioner is divided into a heating cycle of cooling an engine to circulate cooling water heated to a high temperature to heat ambient air, and a refrigeration cycle of cooling air by circulating a refrigerant to absorb heat of ambient air.

In the refrigerating cycle system having an internal heat exchanger among these air conditioners, as shown in FIG. 1, the refrigerant is compressed in the compressor 2, and the compressed refrigerant flows into the radiator 3 to exchange heat with the outside air. In the internal heat exchanger 4, heat exchange is performed between the high pressure refrigerant compressed by the compressor 2 and the low pressure refrigerant flowing into the compressor 2. The refrigerant having a high temperature and high pressure passing through the internal heat exchanger 4 is decompressed by the expansion device 5 and flows into the evaporator 6 that cools the air in the vehicle compartment and heat exchanges with the air in the vehicle compartment. The refrigerant flowing out of the evaporator 6 passes through the gas-liquid separator 7 separating the gas phase and the liquid phase, and then only the gas phase refrigerant flows into the internal heat exchanger 4.

In the refrigeration cycle system, the refrigerant is circulated through the piping pipes, which are connected to each other by connecting pipes, and the piping pipes are connected using connection blocks and flange blocks.

2 shows a pipe flange connection structure between a conventional internal heat exchanger and an evaporator and a gas-liquid separator in a refrigeration cycle system having an internal heat exchanger. The dashed line in the figure represents the circuit of the refrigeration cycle system and the solid line represents the pipe, the connecting block and the flange block. As shown, the first flange block 12 is installed at the inlet and the outlet of the evaporator 6 to pipe the pipes respectively connected to the expansion device 5 and the gas-liquid separator 7, and the internal heat exchanger ( The first connection block 14 is installed at the high pressure outlet part and the low pressure inlet part of 4) to pipe the pipes respectively connected to the expansion device 5 and the gas-liquid separator 7, and the expansion device 5 is It is mounted on the second flange block 16 and is installed to be expanded. The pipe expanded for mounting the expansion device 5 is connected to the first connection block 14 via the second connection block 18. The pipe is to be piped.

However, according to the pipe flange connection structure between the conventional internal heat exchanger and the evaporator and the gas-liquid separator, as shown in FIG. 2, since the pipes are connected using a plurality of connection blocks and flange blocks, the pipe connection is complicated and parts management is not easy. There is a problem in that the welding parts (11 places indicated by dots in Fig. 2) for welding the pipe to the connection block and the flange block have a problem in that productivity and workability are poor.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to simplify the pipe connection between the internal heat exchanger and the evaporator and the gas-liquid separator, thereby reducing the welding point and the number of parts, thereby increasing the productivity and workability. To provide a pipe flange connection structure of a refrigeration cycle system.

The present invention provides a pipe flange connection structure of a refrigeration cycle system having an internal heat exchanger for installing an expansion device between an internal heat exchanger and an evaporator to pipe between the internal heat exchanger and an evaporator and a gas-liquid separator. The welded first flange block; A second flange block to which the inlet pipe and the outlet pipe of the gas-liquid separator are welded; The first flange block is tightly coupled to one side, the second flange block is tightly coupled to the other side, and the high pressure outlet pipe and the low pressure inlet pipe of the internal heat exchanger are welded to another side. A block; First fastening means for fastening and coupling the first flange block and the main block; And a second fastening means for fastening and coupling the second flange block and the main block.

The main block has a first communication hole for communicating the outlet tube of the evaporator and the inlet tube of the gas-liquid separator, a second communication hole for communicating the outlet tube of the gas-liquid separator tube and the low pressure inlet tube of the internal heat exchanger; A third communication hole is formed to communicate the high pressure outlet tube of the internal heat exchanger and the inlet tube of the evaporator, and the expansion device is inserted into the third communication hole.

The high pressure outlet pipe and the low pressure inlet pipe of the internal heat exchanger are double pipes in which the high pressure outlet pipe is inserted into the low pressure inlet pipe, and the high pressure outlet pipe protrudes from the low pressure inlet pipe and communicates with the third communication hole. The main block is provided with a welding slit groove to weld the end of the high pressure outlet pipe. At this time, the inlet of the slit groove is wide to facilitate the welding.

In the middle of the main block is formed a hollow portion to facilitate the coupling means for fastening the flange block.

The second flange block, the second flange sub-mail block is formed with a coupling hole for joining the inlet tube of the gas-liquid separator by welding, and the groove is inserted into the second flange sub-mail block is inserted into one side and the other side is formed. The outlet pipe of the gas-liquid separator is made of a second flange mail block formed with a coupling hole to be joined by welding, the second flange sub-mail block and the one surface of each of the second flange mail block in communication with the coupling hole A coupling protrusion formed by protruding into the coupling protrusion is formed, and a sealing member is fitted and coupled to the coupling protrusion, and a communication hole communicating with the coupling hole is formed on the other side of the main block, while the coupling protrusion is formed in the communication hole. On the other hand, a protrusion coupling groove is formed in which one surface of the sealing member is seated.

A coupling hole is formed in the first flange block in which the inlet pipe and the outlet pipe of the evaporator are welded, and a communication hole communicating with the coupling hole is formed at one side of the main block while communicating with the communication hole. A coupling protrusion formed by protruding in a state is formed, and a sealing member is fitted into the coupling protrusion to be seated and seated, and the coupling protrusion is coupled to the coupling hole of the first flange block while the one surface of the sealing member is seated. Coupling groove is dug.

The sealing member coupled to the coupling hole in communication with the inlet pipe of the evaporator is integrated with the expansion device to maintain the fixing and airtight of the expansion device.

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

The piping flange connection structure of the present invention is provided with an expansion device (5: expansion valve) between the internal heat exchanger 4 and the evaporator 6 as shown in Fig. 3 and the internal heat exchanger 4 and the evaporator 6; The first flange block 30 is applied to the refrigeration cycle system having an internal heat exchanger piped between the gas-liquid separator (7), the inlet pipe (6a) and the outlet pipe (6b) of the evaporator 6, and Fastening means described later by the second flange block 40 welded to the inlet pipe 7a and the outlet pipe 7b of the gas-liquid separator 7 and the first flange block 30 and the second flange block 40. It is provided with a main block 20 fastened by.

4 to 6, the first flange block 30 is in close contact with one side (20a) of the main block 20 is coupled by a first fastening means 62, the main block The second flange block 40 is in close contact with the other side 20b of the 20, and is coupled by the second fastening means 64, and the internal heat is applied to the other side 20c of the main block 20. The low pressure inlet pipe 4a and the high pressure outlet pipe 4b of the exchanger 4 are welded and piped.

5 and 9, the main block 20 has a first communication hole for communicating the outlet pipe 6b of the evaporator 6 with the inlet pipe 7a of the gas-liquid separator 7. 21, the second communication hole 22 which communicates the outlet pipe 7b of the gas-liquid separation tube 7 with the low pressure inlet pipe 4a of the internal heat exchanger 4, and the internal heat exchanger 4 of the internal heat exchanger 4. A third communication hole 23 is formed which communicates the high pressure outlet pipe 4b and the inlet pipe 6a of the evaporator 6. The expansion device 5 is inserted into the third communication hole 23.

As shown in Fig. 9, the high pressure outlet pipe 4b and the low pressure inlet pipe 4a of the internal heat exchanger 4 are double pipes in which the high pressure outlet pipe 4b is inserted into the low pressure inlet pipe 4a. The high pressure outlet pipe 4b protrudes from the low pressure inlet pipe 4a and communicates with the third communication hole 23. And, the other side surface 20d of the main block 20, the welding slit groove 24 is formed to weld the end of the high-pressure outlet pipe (4b). At this time, the inlet of the slit groove 24 may be wide in the shape of a chamfer (chamfer) or the like to facilitate welding. In addition, in the middle of the main block 20 is formed a hollow portion 25 to facilitate the engagement of the first fastening means 62 for fastening the first flange block 30.

On the other hand, as shown in Figure 5, the one side surface 20a of the main block 20 is formed with a first fastening through hole 26 which is inserted to fasten the bolt of the first fastening means 62, A second fastening screw hole 27 is formed in the other side surface 20b of the main block 20 to which the bolt of the second fastening means 64 is screwed.

As shown in FIGS. 7 and 8, the first flange block 30 is provided with a pipe coupling hole 31 in which the inlet pipe 6a and the outlet pipe 6b of the evaporator 6 are welded. On one side of the main block 20, coupling protrusions 70 protruding in communication with the first and third communication holes 21 and 23 are formed, respectively, and in the coupling protrusions 70, respectively. The sealing member 50 is fitted to be seated and seated, and the coupling protrusion 70 is coupled to the opposite side of the pipe coupling hole 31 of the first flange block 30 while one surface of the sealing member 50 is seated. The first protrusion coupling groove 32 is excavated, and the second protrusion coupling groove 33 is coupled to the end of the second coupling protrusion, which will be described later, at a predetermined interval around the outer circumference of the pipe coupling hole 31. Lose.

In addition, a second seating surface 34 is formed between the second protrusion coupling groove 33 and the pipe coupling hole 31 to which one surface of the inner sealing portion, which will be described later, of the sealing member 50 will be seated. The sealing bead 35 protrudes from the surface 34. In addition, a first fastening screw hole 36 is formed in the first flange block 30 so as to correspond to the first fastening through hole 26 in the middle of the body, and the bolt of the first fastening means 62 penetrates and is coupled thereto. do.

As shown in FIG. 7, the coupling protrusion 70 is formed on the first coupling protrusion 72 protruding in communication with the pipe coupling hole 31, and on the end face of the first coupling protrusion 72. As shown in FIG. The second coupling protrusion 74 is formed to protrude and form a first seating surface 74a inward.

The sealing member 50 is fitted into the second coupling protrusion 74 to surround the outer surface of the second coupling protrusion 74 and is seated on the first seating surface 74a inward of the second coupling protrusion 74. do. On the first seating surface 74a, a sealing bead 74b in which the inner sealing part of the sealing member 50 to be described later is seated is formed to form a circular protruding band. The sealing bead 74b may be formed in various shapes such as a triangular cross-sectional shape, a circular cross-sectional shape, and a polygonal cross-sectional shape.

10 and 11, the sealing member 50 includes an O-ring portion 51 coupled to seal the outer side of the second coupling protrusion 74, and an inner side of the O-ring portion 51. Is coupled to the inside of the second coupling protrusion 74 to be seated on the first seating surface 74a, the pipe coupling holes 81 and 92 (shown in FIGS. 13 and 14) and the first and third communication holes ( The inner sealing part 52 in which the through-hole 52a which communicates with 21 and 23 is formed.

The sealing member 50 may be formed integrally with the O-ring portion 51 and the inner sealing portion 52, a plurality of protrusions spaced along the outer circumferential surface of the inner sealing portion 52, the end of the O-ring It may be formed by including a wing portion 53 fixed to the portion 51 to maintain a gap between the inner sealing portion 52 and the O-ring portion 51.

The O-ring portion 51 is formed in a circular ring shape whose inner diameter is not larger than the outer diameter of the second coupling protrusion 74 and is fitted into the outside of the second coupling protrusion 74. In addition, the O-ring part 51 is made of synthetic rubber or rubber material, and preferably made of ethylene rubber (EPDN) or nitrole rubber (H-NBR) having excellent cold resistance and airtightness.

The inner sealing portion 52 is formed in the shape of a disc with a through hole 52a in the center thereof, and the second coupling protrusion 74 is fitted between the outer circumferential surface and the inner circumferential surface of the O-ring portion 51 to be coupled to the O-ring portion 51. It is fixed inside of. The inner sealing portion 52 is manufactured using a soft metal such as tin alloy, soft aluminum, or lead, fluorine resin, or Teflon resin. That is, the inner sealing part 52 may use a softer material than the first and second flange blocks 30 and 40 or the main block 20, and may be used by giving a hardness difference when using the same material, or by using a resin material. It is manufactured using.

In addition, the inner sealing portion 52 has a plurality of wings 53 are integrally protruded at intervals on the outer peripheral surface, the end of the wing portion 53 is inserted into the O-ring 51 is fixed to the inside. . The wing portion 53 is to cover the portion O-ring portion 51 to the outside in order to strengthen the coupling force. In addition, the wing portion 53 protrudes in a number corresponding to the coupling groove to be described later formed in the second coupling projection (74).

The gap between the O-ring portion 51 and the inner sealing portion 52 is formed to be 1 to 2 times the thickness of the second coupling protrusion portion 74, so that the sealing member 50 has a second coupling protrusion in a range that does not reduce the airtightness. It is made to attach to 74, and it is easy to combine.

The O-ring portion 51 is preferably formed with a cross-sectional thickness t1 of 1.0 to 2.0 times the thickness t2 of the inner sealing portion 52, which is the secondary sealing and the main by the compression of the O-ring portion 51 By equalizing the sealing of the inner sealing part 52, which is a sealing function, if the cross section thickness t1 of the O-ring part is large, the secondary sealing effect is increased, while the sealing function of the inner sealing part 52, which is the main sealing part, is weakened, There is a structural disadvantage, and when the O-ring section cross-sectional thickness t1 is small, the main sealing function is increased, but the secondary sealing function is deteriorated, so that the corrosive material from the outside penetrates and may cause corrosion of the inner sealing part.

In addition, the cross-sectional thickness ratio t1 / t2 also affects the assembly of the male part and the female part and the increase of the flange size, so that when the cross-sectional thickness ratio is large (t1> t2), the assembly is difficult and the size of the male part must be large.

The second coupling protrusion 74 has a plurality of coupling grooves 74c which are vertically drilled at an end thereof, and a plurality of coupling grooves 74c are formed at intervals, and at the ends of the second coupling protrusion 74 to reinforce the coupling force of the sealing member 50. A locking jaw 74d for catching the O-ring portion 51 of the sealing member 50 is formed. At this time, the sealing member 50 is about 0.8 times smaller than the inner diameter of the sealing member 50 of the O-ring portion 51 than the outer diameter of the second coupling protrusion 74, the second coupling protrusion by the elasticity of the O-ring portion 51 It is fixed by combining with (74).

As shown in Figs. 13 and 14, the second flange block 40 has a second flange sub formed with a pipe coupling hole 81 through which the inlet pipe 7a of the gas-liquid separator 7 is joined by welding. A mail block 80 and a groove 91 to which the second flange sub-mail block 80 is inserted and coupled to one side are formed, and the outlet pipe 7b of the gas-liquid separator 7 is coupled to the other side by welding. It consists of a second flange mail block 90 formed with a pipe coupling hole (92).

Coupling protrusions 70 and 70 are formed on each surface of the second flange sub-mail block 80 and the second flange mail block 90 to protrude in communication with the pipe coupling holes 81 and 92. The sealing protrusion 50 is fitted to the coupling protrusion 70 to be seated.

The second flange sub-mail block 80 includes an insertion portion 82 having the pipe coupling hole 81 and inserted into a groove 91 of the second flange mail block 90, and the insertion portion 82. ) Is inserted into a predetermined length and is caught while the pressing portion 83 formed on the outer circumferential surface to press the main block 20 by the fastening of the second fastening means 64, and the engaging projection portion protruding from the pressing portion ( 70). The inlet of the pipe coupling hole 81 is widened so that the inlet pipe 7a comes into close contact with and welded.

The second flange mail block 90 has the pipe coupling hole 92 and the groove 91, and the second fastening means 64 is disposed between the pipe coupling hole 92 and the groove 91. The second fastening through hole 93 is formed so that the bolt of. The inlet portion of the pipe engaging hole 92 is widened so that the outlet pipe 7b is in close contact and welded. The groove 91 is opened in the lateral direction of the second flange mail block 90 so that the second flange submail block 80 is easily assembled.

On the side end of the second flange mail block 90, a stepped step portion 94 for reinforcing the fastening force of the bolt of the second fastening means 64 protrudes, and the stepped portion 94 is a second flange. The fastening force of the bolt is uniformly transmitted to the sub-mail block 80. That is, the stepped portion 94 is such that the force of the bolts of the second fastening means 64 is not biased to one side of the pressing portion 83 when the second flange mail block 90 and the main block 20 are coupled. The clamping force is transmitted evenly to the end, and when a high-pressure refrigerant is passed, the leak occurs due to the lowering of the clamping force or serves to maintain the clamping force that can withstand the high pressure.

As shown in FIG. 12, the coupling protrusion 70 is coupled to the other side surface 20b of the main block 20 so as to communicate with the first and third communication holes 21 and 23, respectively. The first protrusion coupling groove 32 ′ in which one surface of the member 50 is seated is excavated, and the second coupling protrusion part at a predetermined interval around the outer circumference of the first and third communication holes 21 and 23. The second protrusion coupling groove 33 'to which the end of 74 is coupled is excavated. In addition, a second seating surface 34 ′ is formed between the second protrusion coupling groove 33 ′ and the third communication hole 23 on which one surface of the inner sealing portion, which will be described later, of the sealing member 50 is seated. The sealing bead 35 'protrudes from the second seating surface 34'.

Since the coupling protrusion 70 and the sealing member 50 associated with the second flange block 40 are the same as described above with reference to FIGS. 7, 10, and 11, detailed descriptions thereof will be omitted.

Meanwhile, as shown in FIG. 5, the sealing member 50 coupled to the coupling hole communicating with the inlet pipe 6a of the evaporator 6 is the expansion device so as to maintain the fixing and airtightness of the expansion device 5. It may be integrated with (5).

Pipe flange connection structure of the refrigeration cycle system having an internal heat exchanger according to the present invention configured as described above, the expansion device 5 is inserted into the main block 20, the evaporator 6 on one side of the main block 20. The first flange block 30 welded to the inlet pipe 6a and the outlet pipe 6b of the main block 20 by fastening means, and the inlet pipe 7a of the gas-liquid separator 7 on the other side of the main block 20; The second flange block 40 to which the outlet pipe 6b is welded is fastened by a fastening means, and the other side of the main block 20 is welded to the other side of the internal heat exchanger 4 by joining a double pipe by welding. Is reduced to 6 (see the dot in FIG. 3), thereby simplifying the pipe connection between the internal heat exchanger and the evaporator and the gas-liquid separator, thereby reducing the welding point and the number of parts, thereby increasing productivity and workability.

At this time, the main block 20 is formed with a slit groove 24 for welding the high-pressure outlet pipe (4b) of the internal heat exchanger 4, the space portion 25 for fastening the flange block 30 is formed It makes the welding and bolting work particularly easy.

Where the flange blocks 30 and 40 are coupled to the main block 20, the first and second coupling protrusions 72 and 74 may include the first and second protrusion coupling grooves 32, 32 ′, 33 and 33 ′. By coupling to each), the strength is increased at the coupling portion, and the sealing member is fitted to the second coupling protrusion to double the sealing action inside and outside the pipe coupling hole, thereby increasing the airtightness at the coupling portion after assembly.

The present invention is not limited to the above embodiments and can be implemented in various modifications.

According to the double pipe flange connection structure of the refrigeration cycle system having the internal heat exchanger of the present invention, by simplifying the pipe connection between the internal heat exchanger and the evaporator and gas-liquid separator, the effect of improving the productivity and workability by reducing the number of welding points and parts have.

Claims (7)

In the pipe flange connection structure of the refrigeration cycle system having an internal heat exchanger installed between the internal heat exchanger and the evaporator to pipe between the internal heat exchanger and the evaporator and gas-liquid separator, A first flange block to which an inlet pipe and an outlet pipe of the evaporator are welded; A second flange block to which the inlet pipe and the outlet pipe of the gas-liquid separator are welded; The first flange block is tightly coupled to one side, the second flange block is tightly coupled to the other side, and the high pressure outlet pipe and the low pressure inlet pipe of the internal heat exchanger are welded to another side. A block; First fastening means for fastening and coupling the first flange block and the main block; And a second fastening means for fastening and coupling the second flange block and the main block. The method according to claim 1, The main block has a first communication hole for communicating the outlet tube of the evaporator and the inlet tube of the gas-liquid separator, a second communication hole for communicating the outlet tube of the gas-liquid separator tube and the low pressure inlet tube of the internal heat exchanger; The third communication hole for communicating the high-pressure outlet tube of the internal heat exchanger and the inlet tube of the evaporator is formed, And the expansion device is inserted into the third communication hole, and the double pipe flange connection structure of the refrigeration cycle system having an internal heat exchanger. The method according to claim 1, The high pressure outlet pipe and the low pressure inlet pipe of the internal heat exchanger are double pipes in which the high pressure outlet pipe is inserted into the low pressure inlet pipe. The high pressure outlet pipe protrudes from the low pressure inlet pipe and communicates with the third communication hole. The main block is a double pipe flange connection structure of the refrigeration cycle system having an internal heat exchanger, characterized in that the welding slit groove is formed to weld the end of the high-pressure outlet pipe. The method according to claim 1, The middle of the main block is a double pipe flange connection structure of the refrigeration cycle system having an internal heat exchanger, characterized in that the hollow portion is formed to facilitate the coupling of the fastening means for fastening the flange block. The method according to any one of claims 1 to 4, The first flange block is formed with a coupling hole in which the inlet pipe and the outlet pipe of the evaporator are joined by welding, One side surface of the main block is formed with a communication hole communicating with the coupling hole, while the engaging projection formed by protruding in communication with the communication hole is formed, Sealing member is fitted to the coupling projection is coupled and seated, The coupling hole of the first flange block is a double pipe flange connection structure of the refrigeration cycle system having an internal heat exchanger, characterized in that the coupling protrusion is coupled to the projection coupling groove is seated on one surface of the sealing member. The method according to any one of claims 1 to 4, The second flange block, the second flange sub-mail block formed with a coupling hole for joining the inlet tube of the gas-liquid separator by welding, and the groove is coupled to the second flange sub-mail block is inserted into one side is formed on the other side The outlet pipe of the gas-liquid separator is made of a second flange mail block formed with a coupling hole is coupled by welding, Coupling protrusions are formed on each surface of the second flange sub-mail block and the second flange mail block to protrude in a state of communicating with the coupling hole. Sealing member is fitted to the coupling projection is coupled and seated, Internal heat exchange, characterized in that the other side of the main block is formed with a communication hole communicating with the coupling hole, the communication hole is coupled to the coupling projection and the projection coupling groove for mounting one surface of the sealing member is recessed. Double pipe flange connection of refrigeration cycle system with machine. The method according to any one of claims 1 to 4, Sealing member coupled to the coupling hole in communication with the inlet pipe of the evaporator is a double pipe flange connection of the refrigeration cycle system having an internal heat exchanger, characterized in that it is integrated with the expansion device to maintain the fixed and airtight of the expansion device. rescue.

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