Copper pipe fitting and air conditioner having the same

Abstract

The present invention relates to a copper pipe fitting and an air conditioner having the same. The copper pipe fitting includes: an air collecting pipe and an air distributing pipe; the air collecting pipe and the air distributing pipe are interconnected; the air distributing pipe includes N air distributing branches, and the connecting area of any two adjacent air distributing branches on the cross section is an edge-to-edge connection; N is a natural number greater than or equal to 2. The solution provided by the present application can solve the problem that in the existing 8-like structure, since the transition position of the air collecting pipe and the air distributing pipe has two connecting areas on the cross section, the tensile stress is the largest, which causes the transition position to be prone to deformation or cracking; the present application sets the connecting area of the air distributing pipe on the cross section to be an edge-to-edge connection, and changes the stress-bearing point from two concentrated points to a line, which can disperse the concentrated tensile stress, avoid the local area of the transition position from being subjected to large tensile stress, and effectively solve the problems such as deformation or cracking caused by the transition position being subjected to the impact of the refrigerant for a long time.

Description

Technical Field

[0001] The present application relates to the technical field of copper pipe fittings, and in particular to a copper pipe fitting and an air conditioner having the same. Background Art

[0002] In air-conditioning systems, various types of copper tubes are often used to connect the evaporator and condenser to carry the refrigerant, thereby ensuring the normal operation of the air-conditioning system. Such copper tubes are generally called copper pipe fittings. As the air conditioner is running, the refrigerant pressure will change with the temperature, causing the copper pipe fittings to be continuously impacted by the refrigerant during use. Due to the irregular size and shape of the copper pipe fittings, the stress distribution on any cross section of the inner wall of the copper pipe fittings is uneven. In local areas where the cross-sectional dimensions change greatly, stress concentration is prone to occur. The greater the change in the cross-sectional dimensions, the more severe the stress concentration, and the more likely the copper pipe fittings are to deform or crack in the local areas where stress is concentrated.

[0003] In related technologies, such as Figure 1-Figure 2 As shown, the structure of the existing copper pipe fittings is an 8-shaped structure. After stamping, its transition position (that is, the middle of the 8-shaped structure is squeezed to a close position) is subjected to a large tensile stress, resulting in a thinner tube wall at the transition position and low strength; and the curvature of the transition position is a negative curvature, and is subjected to large stress; even if the stress it is subjected to does not exceed the elastic limit or yield strength of the material, due to excessive stress concentration, the local stress to which the metal material at the transition position is subjected for a long time will also be higher than the yield strength of the material, thereby causing the metal material at the transition position to undergo plastic strain and form a plastic zone; since the transition position is the position where the cross-sectional dimension changes the most, that is, this position is the stress concentration point of the copper pipe fitting, during the long-term use of the air conditioner, the copper pipe fitting is continuously subjected to the impact stress of the refrigerant, resulting in deformation of the transition position and even cracking, leading to refrigerant leakage. In order to solve this problem, if the tube wall thickness at the transition position is directly increased, the entire copper pipe fitting will need to increase its thickness accordingly, which is costly.

[0004] Therefore, it is necessary to design a copper pipe fitting that can reduce the deformation, cracks and even cracking of the copper pipe fitting caused by stress concentration at the transition position while adapting to other air-conditioning parts, thereby causing the problem of refrigerant (coolant) leakage. Summary of the Invention

[0005] In order to overcome the problems existing in the related art, the present application provides a copper pipe fitting and an air conditioner having the same. The copper pipe fitting and the air conditioner having the same can set the connection area of the gas distribution pipe on the cross section as an edge-to-edge connection, and change the stress-bearing points from two concentrated points to a line, thereby dispersing the concentrated tensile stress, avoiding the local transition position from being subjected to large tensile stress, and effectively solving the problems of deformation or cracking caused by long-term impact of refrigerant on the transition position.

[0006] The first aspect of the present application provides a copper pipe fitting, including a gas collecting pipe and a gas distributing pipe; the gas collecting pipe and the gas distributing pipe are connected to each other; the gas distributing pipe includes N gas branch pipes, and the connection area between any two adjacent gas branch pipes in the cross section is an edge-to-edge connection; N is a natural number greater than or equal to 2.

[0007] In one embodiment, one end of the gas collecting pipe is a flared end, and the cross-section of the flared end is circular; the gas branch pipe includes two ends, one end has a circular cross-section, and the other end has a fan-shaped cross-section, and the end with a fan-shaped cross-section is arranged in the flared end.

[0008] In one embodiment, N is 2, and the central angle of the sector is 180 degrees.

[0009] In one embodiment, N is 3, and the central angle of the sector is 120 degrees.

[0010] In one embodiment, N is 4, and the central angle of the sector is 90 degrees.

[0011] In one embodiment, a weld is provided between the gas collecting pipe and the gas distribution pipe.

[0012] In one embodiment, the distance of the weld is 0.1 mm to 0.3 mm.

[0013] In one embodiment, the gas branch pipe includes a fan-shaped structure segment and a circular transition segment, a step is provided between the fan-shaped structure segment and the circular transition segment, and the circular transition segment is a position interval where the cross section is fan-shaped to a position interval where the cross section is circular.

[0014] In one embodiment, the gas collecting pipe and the gas distribution pipe are fixedly connected.

[0015] A second aspect of the present application provides an air conditioner, comprising a condenser, an evaporator and the copper pipe fittings as described above, wherein the gas collecting pipe is connected to the condenser; and the gas distribution pipe is connected to the evaporator.

[0016] The technical solution provided by the present application may include the following beneficial effects: The copper piping of the present application includes a gas collecting pipe and a gas branching pipe; the gas collecting pipe and the gas branching pipe are used to carry refrigerant, the gas collecting pipe and the gas branching pipe are interconnected so that the refrigerant can flow through the gas collecting pipe and the gas branching pipe, the gas branching pipe includes N gas branching pipes, and the connecting area of any two adjacent gas branching pipes in the cross section is an edge-to-edge connection; N is a natural number greater than or equal to 2. In the existing quasi-8 structure, since the transition position between the gas collecting pipe and the gas branching pipe is connected at two points in the cross section, the tensile stress is the greatest, which easily causes deformation or cracking at the transition position; unlike the existing quasi-8 structure, the present application sets the connecting area of the gas branching pipe in the cross section to an edge-to-edge connection, changing the stress-bearing point from two concentrated points to a line, which can disperse the concentrated tensile stress and prevent the local area of the transition position from being subjected to large tensile stress, effectively solving the problem of deformation or cracking caused by long-term impact of the refrigerant at the transition position.

[0017] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0019] Figure 1 It is a structural diagram of copper pipe fittings in the prior art;

[0020] Figure 2 It is a schematic cross-sectional view of a copper pipe fitting in the prior art;

[0021] Figure 3 1 is a schematic structural diagram of a copper pipe fitting when there are two gas branch pipes shown in an embodiment of the present application;

[0022] Figure 4 This is an exploded view of a copper pipe fitting when there are two gas branch pipes shown in an embodiment of the present application;

[0023] Figure 5 2 is a cross-sectional view of a copper pipe fitting when there are two gas branch pipes according to an embodiment of the present application;

[0024] Figure 6 1 is a schematic structural diagram of a copper pipe fitting when there are three gas branch pipes shown in an embodiment of the present application;

[0025] Figure 7 This is an exploded view of a copper pipe fitting when there are three gas branch pipes shown in an embodiment of the present application;

[0026] Figure 8 2 is a cross-sectional view of a copper pipe fitting when there are three gas branch pipes according to an embodiment of the present application;

[0027] Figure 9 1 is a schematic structural diagram of a copper pipe fitting when there are four gas branch pipes shown in an embodiment of the present application;

[0028] Figure 10 This is an exploded view of a copper pipe fitting when there are four gas branch pipes in the embodiment of the present application;

[0029] Figure 11 2 is a cross-sectional view of a copper pipe fitting when there are four gas branch pipes according to an embodiment of the present application;

[0030] Figure 12 is a cross-sectional view of the copper pipe fitting shown in another angle in an embodiment of the present application;

[0031] Figure 13 Schematic diagram of the structure of the steps shown in the embodiment of the present application;

[0032] Figure 14 yes Figure 13 A is an enlarged schematic diagram.

[0033] Reference numerals:

[0034] 1. Gas collecting pipe; 12. Flared end; 2. Gas distribution pipe; 21. Gas branch pipe; 3. Weld; 4. Step. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. Instead, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0036] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0037] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] At present, in the existing 8-like structure, since the transition position (that is, the position where the middle of the 8-like structure is squeezed to the closest position) is the position where the cross-sectional size changes the most, that is, this position is the stress concentration point of the copper pipe fittings. During the long-term use of the air conditioner, the copper pipe fittings are constantly impacted by the refrigerant, causing the transition position to deform or even crack, resulting in refrigerant leakage. In order to solve this problem, if the pipe wall thickness at the transition position is directly increased, the entire copper pipe fitting will need to increase its thickness accordingly, which is costly.

[0039] In response to the above problems, an embodiment of the present application provides a copper pipe fitting, which can set the connection area of the gas branch pipe on the cross section as an edge-to-edge connection, and change the stress-bearing points from two concentrated points to a line, which can disperse the concentrated tensile stress and avoid the local area of the transition position from being subjected to large tensile stress, effectively solving the problems of deformation or cracking caused by long-term impact of refrigerant on the transition position.

[0040] The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0041] Example 1

[0042] See also Figure 3-Figure 5 , Figure 3 1 is a schematic structural diagram of a copper pipe fitting when there are two gas branch pipes shown in an embodiment of the present application; Figure 4 This is an exploded view of a copper pipe fitting when there are two gas branch pipes shown in an embodiment of the present application.

[0043] See Figure 3-Figure 4The copper pipe fittings of the present application include an air collecting pipe 1 and an air distribution pipe 2; the air collecting pipe 1 and the air distribution pipe 2 are fixedly connected and interconnected; specifically, the cross-sections of both ends of the air collecting pipe 1 are circular, wherein one end of the air collecting pipe 1 is a flared end, that is, the diameter of the flared end 12 is larger than the diameter of the other end of the air collecting pipe 1; the air distribution pipe 2 includes N air distribution branches 21, and the air distribution branch 21 includes two ends, wherein the cross-section of one end is circular and the cross-section of the other end is fan-shaped, and the end of the air distribution branch 21 with a fan-shaped cross-section is arranged in the flared end 12, so that the refrigerant can flow in the air collecting pipe 1 and the air distribution pipe 2; N is a natural number greater than or equal to 2. The cross section is perpendicular to Figure 3 The cross section in the length direction of the gas collecting pipe; it should be noted that the limitation of the cross section here is schematic and is limited to the understanding based on the drawings shown in the embodiments of this application as a reference direction, because in actual applications, the gas collecting pipe can be in a non-straight pipe state, and the gas collecting pipe in a non-straight pipe state should not be used as a limitation for understanding the "cross section" of this application.

[0044] Since the flow rate of the refrigerant per unit volume will be changed in the area where the gas collecting pipe 1 and the gas distribution pipe 2 are connected, the connection area is subjected to a large impact force from the refrigerant. In the long run, the copper pipe fittings in the connection area are likely to be deformed or cracked. In order to disperse the impact force on the connection area, the connection area of any two adjacent gas distribution pipes in the cross section is connected edge to edge; specifically, Figure 5 As shown, Figure 5 This is a cross-sectional view of the copper pipe fitting when there are two gas branch pipes shown in the embodiment of the present application. The cross-sectional view is cut from the position where the collecting pipe 1 and the gas branch pipe 2 are connected, and the cutting direction is perpendicular to the length direction of the collecting pipe, and then it is a schematic diagram looking from the collecting pipe 1 to the gas branch pipe 2; when there are two gas branch pipes 21, that is, N is 2, the central angle of the fan is 180 degrees, and at this time, the fan is D-shaped. It should be noted that: the connection area is the transition area when the refrigerant (coolant) converges or diverges, and the cross section is the surface that is subject to the greatest stress when the refrigerant (coolant) converges or diverges; the degree of the central angle can be adjusted accordingly according to actual needs.

[0045] In actual operation, after one end of the gas branch pipe 21 is punched into a D-shaped structure through a mold, the two gas branch pipes 21 punched into the D-shaped structure are inserted into the flared end 12 of the collecting pipe 1, and the two gas branch pipes 21 are symmetrically distributed, and a gap is provided between the two sides connected by any two adjacent gas branch pipes 21, and the gap is 0.05mm~0.20mm; then the gas branch pipe 21 and the collecting pipe 1 are fixedly connected. Specifically, the gas branch pipe with a D-shaped structure can be welded to the flared end of the collecting pipe by manual flame brazing, while ensuring the welding quality such as welding penetration and weld hot spot grain size.

[0046] In the first embodiment of the present invention, the copper pipe fittings of the present invention include a gas collecting pipe and a gas branching pipe; the gas collecting pipe and the gas branching pipe are used to carry refrigerant, the gas collecting pipe and the gas branching pipe are interconnected, so that the refrigerant can flow in the gas collecting pipe and the gas branching pipe, and the gas branching pipe includes N gas branching pipes, and the connection area of any two adjacent gas branching pipes on the cross section is an edge-to-edge connection; N is a natural number greater than or equal to 2. In the existing quasi-8 structure, since the transition position of the gas collecting pipe and the gas branching pipe is connected at two points on the cross section, the tensile stress is the largest, which easily causes deformation or cracking of the transition position; different from the existing quasi-8 structure, the present application sets the connection area of the gas branching pipe on the cross section to be an edge-to-edge connection, and changes the stress-bearing point from two concentrated points to a line, which can disperse the concentrated tensile stress and avoid the local area of the transition position from being subjected to large tensile stress, effectively solving the problems of deformation or cracking caused by the long-term impact of the refrigerant on the transition position.

[0047] Example 2

[0048] When more than two gas branch pipes are required to connect the evaporator, in order to avoid deformation or cracking of the transition position due to long-term impact of the refrigerant, this application proposes a corresponding solution. Please refer to Figures 6-11 , specifically:

[0049] See Figure 6-Figure 7 Based on the structure of the first embodiment, when there are three gas branch pipes 21, that is, N is 3, the central angle of the sector is 120 degrees, and the sector is an obtuse V-shape. It should be noted that the degree of the central angle can be adjusted according to actual needs. After punching one end of the gas branch pipe 21 into an obtuse V-shape structure through a mold, the three gas branch pipes 21 punched into the obtuse V-shape structure are inserted into the flared end 12 of the gas collecting pipe 1, as shown in FIG. Figure 8 As shown, Figure 8This is a cross-sectional view of a copper pipe fitting when there are three gas branch pipes shown in an embodiment of the present application. The cross-sectional view is cut from the position where the gas collecting pipe 1 is connected to the gas branch pipe 2, and the cutting direction is perpendicular to the length direction of the gas collecting pipe. The cross-sectional view is then a schematic diagram viewed from the gas collecting pipe 1 toward the gas branch pipe 2; the center vertices of the three obtuse-angled V-shaped structures coincide, and the three gas branch pipes 2 are evenly and symmetrically distributed.

[0050] See Figure 9-10 When there are four gas branch pipes 21, that is, N is 4, the central angle of the sector is 90 degrees, and the sector is a right-angle V-shape. It should be noted that the degree of the central angle can be adjusted according to actual needs. After punching one end of the gas branch pipe 21 into a right-angle V-shape structure through a mold, the four gas branch pipes 21 punched into the right-angle V-shape structure are inserted into the flared end 12 of the gas collecting pipe 1, as shown in FIG. Figure 11 As shown, Figure 11 This is a cross-sectional view of a copper pipe fitting when there are four gas branch pipes shown in an embodiment of the present application. The cross-sectional view is cut from the position where the gas collecting pipe 1 is connected to the gas branch pipe 2, and the cutting direction is perpendicular to the length direction of the gas collecting pipe. The cross-sectional view is then a schematic diagram viewed from the gas collecting pipe 1 toward the gas branch pipe 2; the center vertices of the four obtuse-angled V-shaped structures coincide, and the four gas branch pipes 2 are evenly and symmetrically distributed.

[0051] A gap is provided between the two sides connected by any two adjacent gas branch pipes 21, and the gap is 0.05mm to 0.20mm; the gas branch pipe 21 and the gas collecting pipe 1 are then fixedly connected. Specifically, the gas branch pipe with a V-shaped structure can be welded to the flared end of the gas collecting pipe by manual flame brazing, while ensuring the welding quality such as welding penetration and grain size of the hot spot of the weld.

[0052] In an embodiment of the present application, when the number of the gas branch pipes is more than 2 (such as 3 or 4 gas branch pipes), since the connection area between any two adjacent gas branch pipes is an edge-to-edge connection, the concentrated stress can be dispersed to a certain extent. Even if this structure causes the area where the center vertices of the fan-shaped circles coincide with each other to be subject to the greatest stress, this area is composed of the edges of multiple gas branch pipes, and the wall thickness of this area is composed of the superposition of the wall thicknesses of multiple gas branch pipes. Compared with the existing 8-shaped structure, the solution provided by the present application has a thicker wall thickness at the area subject to the greatest stress and a higher strength, and can also effectively solve problems such as deformation or cracking caused by long-term impact of the refrigerant at the transition position.

[0053] Example 3

[0054] At present, since the connection of copper pipe fittings is generally fixed by welding, it is easy to cause excessive solder, sagging, weld nodules and even welding blockage during welding. In order to solve the above problems, this application proposes a corresponding solution, please refer to Figure 12-14 , specifically:

[0055] See Figure 12 On the basis of the above embodiment, a weld 3 is further provided between the gas collecting pipe 1 and the gas distribution pipe 2, and the weld 3 is divided into two parts: a tight-fitting section and a weld gap section; in order to facilitate the guidance of solder inflow while preventing excessive solder, sagging, weld nodules and even weld blockage, the gap distance L of the weld 3 is 0.1mm-0.3mm. Specifically, the tight-fitting section adopts a small weld gap to achieve assembly positioning and solder limiting. The gap distance of the tight-fitting section can be 0.1mm-0.2mm, and the gap distance of the weld gap section can be 0.2mm-0.3mm.

[0056] During the welding process, in order to further prevent excessive solder from entering the inner wall of the pipe and clogging the pipe, such as Figure 13-14 As shown, the gas branch pipe 21 includes a fan-shaped structure section and a circular transition section, and a step 4 is provided between the fan-shaped structure section and the circular transition section. The circular transition section is a position interval where the cross-section is fan-shaped to transition to a position interval where the cross-section is circular. Specifically, starting from the step 4, the fan-shaped cross-section begins to change, and after a distance, it is transformed into a circular cross-section. This position interval is the circular transition section, and the diameter of the circle is equal to the diameter of the copper tube. The distance from the step 4 to the connection area can be used to fix the gas collecting pipe 1 and the gas branch pipe 2 by welding.

[0057] In the embodiment of the present application, by providing welds and steps, when welding the collecting pipe and the gas distribution pipe, it is possible to facilitate the guidance of solder flow while preventing excessive solder, sagging, weld nodules and even weld blockage.

[0058] Experimental verification

[0059] To verify the effectiveness of the structure in this application, an assembly welding verification was conducted. Eight welds were randomly selected and, according to the [Manual Brazing Process Management Regulations for Air Conditioners], "Copper pipe butt joints and copper and dissimilar materials butt joints must meet a penetration depth of 60% of the pipe length to be considered acceptable," the eight welds were measured and the weld penetration met the process requirements. The specific results are as follows:

[0060]

[0061]

[0062] After corrosion, the grain size of the heated position of the copper pipe solder joint was observed under a 100x microscope. The measured data are as follows:

[0063]

[0064] According to the [Management Regulations for Manual Brazing of Air Conditioners], the grain size of automatically welded pipe parts is ≤0.13mm, which is normal. As shown in the table above, the grain sizes of the 8 hot spots of the welds were measured, and the measured values were between 0.105 and 0.13mm, indicating that the grain size measurement is qualified.

[0065] Example 4

[0066] Corresponding to the aforementioned embodiment of the application function implementation method, the present application also provides an air conditioner, including a condenser, an evaporator and the copper pipe fittings as described above, the gas collecting pipe 1 is connected to the condenser; the gas distribution pipe 2 is connected to the evaporator.

[0067] The specific structural features of the copper pipe fittings can be found in the above embodiments and will not be described again here.

[0068] The copper pipe fittings in the air conditioner have the same effects as those of the copper pipe fittings described in the aforementioned embodiment 1, embodiment 2 and embodiment 3, and will not be described in detail here.

[0069] Regarding the apparatus in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated again here.

[0070] The scheme of the present application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have their own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the description are not necessarily required for this application. In addition, it is understood that the steps in the method of the embodiment of the present application can be adjusted in sequence, merged and deleted according to actual needs, and the modules in the device of the embodiment of the present application can be merged, divided and deleted according to actual needs.

[0071] The embodiments of the present application have been described above. The above description is illustrative and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. A copper pipe fitting, characterized in that: It comprises an air collecting pipe (1) and an air distribution pipe (2); The gas collecting pipe (1) and the gas distribution pipe (2) are in communication with each other; The gas distribution pipe (2) includes N gas distribution branch pipes (21), and the connection area of any two adjacent gas distribution branch pipes (21) on the cross section is an edge-to-edge connection; N is a natural number greater than or equal to 2; a weld (3) is further provided between the gas collecting pipe (1) and the gas distribution pipe (2); The gas branch pipe (21) comprises a fan-shaped structural section and a circular transition section, a step (4) is provided between the fan-shaped structural section and the circular transition section, and the circular transition section is a section where a position with a fan-shaped cross section transitions to a position with a circular cross section.

2. The copper pipe fitting according to claim 1, characterized in that: One end of the gas collecting pipe (1) is a flared end, and the cross section of the flared end (12) is circular; The gas branch pipe (21) comprises two ends, one end has a circular cross section, and the other end has a fan-shaped cross section, and the end with the fan-shaped cross section is arranged in the expanded end (12).

3. The copper pipe fitting according to claim 2, characterized in that: The N is 2, and the central angle of the sector is 180 degrees.

4. The copper pipe fitting according to claim 2, characterized in that: The N is 3, and the central angle of the sector is 120 degrees.

5. The copper pipe fitting according to claim 2, characterized in that: The N is 4, and the central angle of the sector is 90 degrees.

6. The copper pipe fitting according to claim 1, characterized in that: The distance L of the weld (3) is 0.1 mm to 0.3 mm.

7. The copper pipe fitting according to claim 1, characterized in that: The gas collecting pipe (1) and the gas distribution pipe (2) are fixedly connected.

8. An air conditioner, characterized in that: Including a condenser, an evaporator and a copper pipe fitting according to any one of claims 1-7; The gas collecting pipe is connected to the condenser; The gas distribution pipe is connected to the evaporator.

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