Gas-liquid separator and processing technology thereof

Abstract

The invention provides a gas-liquid separator and a machining process thereof. The gas-liquid separator comprises a shell, the shell is provided with a connector part, an inner connecting pipe is arranged in the shell, an outer connecting pipe is arranged outside the shell, and the connector part is connected with a corresponding set of outer connecting pipe and inner connecting pipe; one of the inner connecting pipe and the outer connecting pipe is inserted into the other one and is welded and fixed, the other one is also inserted into the interface part and is welded and fixed, and knurls are arranged on the surface, used for welding, of at least one of the inner connecting pipe and the outer connecting pipe. And the knurls are beneficial to solder penetration, so that product leakage can be improved, and the welding strength can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of air conditioning systems, and in particular to a gas-liquid separator and a processing technology thereof. Background Art

[0002] The gas-liquid separator is used to separate the refrigerant returned from the evaporator to the compressor into gas and liquid, allowing only the gas to return to the compressor, thereby preventing liquid refrigerant from entering the compressor and destroying lubrication or damaging the scroll plate. At the same time, it ensures that the refrigerant oil returns to the compressor to avoid oil shortage in the compressor.

[0003] like Fig.13 , 14 As shown, Fig.13 is a schematic diagram of a gas-liquid separator; Fig.14 for Fig.13 Magnified view of area I in the middle.

[0004] The gas-liquid separator includes a U-shaped tube 04 and a curved tube 05 located inside its shell 01. The shell 01 is provided with a first interface portion 07 and a second interface portion 06. The first interface portion 07 is externally connected to the first straight tube 02, and the second interface portion 06 is externally connected to the second straight tube 03. The U-shaped tube 04 and the curved tube 05 are inserted into the corresponding second interface portion 06 and first interface portion 07, and the first straight tube 02 and the second straight tube 03 are inserted into the corresponding curved tube 05 and U-shaped tube 04. Then the solder 08 penetrates downward along the gap between the curved tube 05, U-shaped tube 04 and the corresponding straight tube, and penetrates downward along the gap between the curved tube 05, U-shaped tube 04 and the corresponding first interface portion 07 or the second interface portion 06.

[0005] However, due to processing errors, the gaps between the U-shaped tube 04, the curved tube 05, and the corresponding first interface portion 07, the second interface portion 06 or the first straight tube 02, the second straight tube 03 are unevenly distributed, and a gapless state may occur, which will cause the solder to be unable to penetrate and cause leakage and poor welding strength. Summary of the invention

[0006] The purpose of the present application is to provide a gas-liquid separator and a processing technology thereof, wherein the knurling provided therein is conducive to solder penetration, can improve product leakage and enhance welding strength.

[0007] The gas-liquid separator provided in the present application includes a shell, the shell is provided with an interface part, the interior of the shell is provided with an internal tube, and the exterior of the shell is provided with an external tube, the interface part is connected with a corresponding group of the external tubes and the internal tubes; one of the internal tube and the external tube is inserted into the other and welded and fixed, and the other is also inserted into the interface part and welded and fixed, and at least one of the internal tube and the external tube has a knurled surface for welding.

[0008] In the present application, since at least one of the external tube and the internal tube is provided with knurling, gapless penetration of solder caused by processing and assembly errors can be reduced or avoided, so as to improve leakage and enhance welding strength. In addition, when the external tube, the internal tube and the corresponding interface are assembled as a whole, the gap is difficult to be evenly divided, and the materials are often different. At this time, solder penetration is difficult to be evenly distributed, and the knurling is conducive to the uniform distribution of solder. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a partial structural schematic diagram of a gas-liquid separator in the first embodiment of the present application;

[0010] Figure 2 for Figure 1 A magnified view of the middle M position;

[0011] Figure 3 for Figure 1 Schematic diagram of the first straight tube;

[0012] Figure 4 for Figure 1 Schematic diagram of the middle elbow;

[0013] Figure 5 for Figure 4 Left view of

[0014] Figure 6 for Figure 1 Schematic diagram of the middle and upper end cover;

[0015] Figure 7 for Figure 1 Schematic diagram of the U-shaped tube;

[0016] Figure 8 for Figure 7 Left view of

[0017] Fig. 9 This is a schematic structural diagram of a U-shaped tube of a gas-liquid separator in the second embodiment of the present application;

[0018] Fig.10 for Fig. 9 Left view of

[0019] Fig.11 for Fig.10 Middle AA section view;

[0020] Fig.12 This is a schematic diagram of the structure of the first straight tube in the third embodiment of the present application;

[0021] Fig.13 is a schematic diagram of a gas-liquid separator;

[0022] Fig.14 for Fig.13 Magnified view of area I in the middle.

[0023] Figure 1-14 The reference numerals in the drawings are described as follows:

[0024] 11-first straight tube; 111-first knurling; 1111-first knurling section; 1112-second knurling section; 12-second straight tube;

[0025] 21- elbow; 211- first flared end; 2111- second knurling; 22- U-shaped tube; 221- second flared end; 2211- fourth knurling; 2212- fifth knurling;

[0026] 3-upper end cover; 31-first interface portion; 32-second interface portion;

[0027] 100-first solder; 200-second solder;

[0028] 01-shell; 02-first straight tube; 03-second straight tube; 04-U-shaped tube; 05-bend tube; 06-second interface; 07-first interface; 08-solder. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] Please refer to Figure 1 , Figure 1 It is a partial structural diagram of the gas-liquid separator in the first embodiment of the present application, which only illustrates the upper end cover 3 and the U-shaped tube 22, the curved tube 21, and the first straight tube 11 and the second straight tube 12 of the gas-liquid separator.

[0031] The gas-liquid separator comprises a shell. The shell in this embodiment is composed of a cylindrical body and an upper end cover 3 and a lower end cover provided at the upper and lower ends thereof. Figure 1 Only the upper end cover 3 of the shell is shown schematically, and the shell is provided with an interface portion, which is a first interface portion 31 or a second interface portion 32, that is, the shell is provided with two interface portions, which are respectively used for the inflow and outflow of the refrigerant, and the refrigerant can enter from the first interface portion 31 and flow out from the second interface portion 32. In this embodiment, an annular flange extending upward is provided on the top of the upper end cover 3, and the annular flange constitutes a part of the first interface portion 31 or the second interface portion 32, and the interface portion penetrates the top wall of the upper end cover 3, and the hole wall of the interface portion includes the inner wall of the annular flange and the inner wall of the penetration position of the upper end cover 3.

[0032] The shell is provided with an internal pipe inside and an external pipe outside, and each interface is connected with a corresponding set of external pipes and internal pipes. In this embodiment, two internal pipes and two external pipes are provided, and the two internal pipes are respectively Figure 1The U-shaped tube 22 and the elbow 21 shown in the figure have two external tubes. Figure 1 The first straight tube 11 and the second straight tube 12 are shown. Among them, one of the inner tube and the outer tube is inserted into the other and welded and fixed, and the other is inserted into the corresponding interface part and welded and fixed, and the surface of at least one of the inner tube and the outer tube for welding is provided with knurling. Specifically, the first straight tube 11, the elbow 21 and the first interface part 31 are connected, and the second straight tube 12, the U-shaped tube 22 and the second interface part 32 are connected, and the connection method is welding. When the refrigerant flows in, it enters the shell of the gas-liquid separator from the elbow 21, and the liquid refrigerant sinks. The gaseous refrigerant can enter from one port of the U-shaped tube 5, and flow from the other port of the U-shaped tube 5 to the second straight tube 12 to flow out of the gas-liquid separator. The internal pipe is not limited to the setting of the elbow 21. In some types of gas-liquid separators, the elbow 21 is not required, and other airflow guiding structures can be provided to allow the gas-liquid two-phase refrigerant to rotate and separate in the gas-liquid separator; the internal pipe is not limited to the setting of the U-shaped tube 5, as long as it has two ports, one for the entry of gaseous refrigerant and the other port for connection with the second interface part 32 and the second straight pipe 12.

[0033] Can continue to combine Figure 2 understand, Figure 2 for Figure 1 The enlarged view of the M position is a schematic diagram of the connection position of the first straight pipe 11, the curved pipe 21 and the first interface portion 31.

[0034] In this embodiment, the lower end of the first straight pipe 11 is inserted into the upper end of the curved pipe 21 , the upper end of the curved pipe 21 is inserted into the first interface portion 31 , the first straight pipe 11 and the curved pipe 21 are welded, and the curved pipe 21 is also welded to the first interface portion 31 . Figure 2 , a first solder 100 between the curved pipe 21 and the first straight pipe 11 , and a second solder 200 between the curved pipe 21 and the first interface portion 31 are schematically illustrated.

[0035] Look again Figure 3 , Figure 3 for Figure 1 Schematic diagram of the first straight tube 11.

[0036] In this embodiment, the lower end of the first straight tube 11 is inserted into the upper end of the curved tube 21. The outer surface of the lower end of the first straight tube 11 is a welding surface. The welding surface can be provided with knurling, which is defined as the first knurling 111. Along the length direction of the first straight tube 11, the length of the first knurling 111 is L1. The first knurling 111 is arranged around the lower end of the first straight tube 11, and the outer diameter of the first knurling 111 is R1. The lower end of the first straight tube 11 is inserted into the upper end of the curved tube 21, and the first knurling 111 of the first straight tube 11 contacts the inner surface of the upper end of the curved tube 21. The outer diameter of the lower end of the first straight tube 11 is defined as r1, and the outer diameter R1 of the first knurling 111 is r1+△r1, and △r1 is, for example, 0.25 mm to meet the requirements of assembly and welding. △r1 can be adjusted according to actual needs.

[0037] In this embodiment, at least one of the external tube or the internal tube is provided with knurling to ensure the consistency of the assembly process. For example, errors may occur during the processing and assembly of the first straight tube 11 and the curved tube 21. During assembly, if the first straight tube 11 is completely fitted to the curved tube 21, due to the presence of the first knurling 111, the knurling can fit the outer surface of the curved tube 21. However, there must be gaps between the knurling strips of the first knurling 111. In this way, a certain gap can still be ensured between the curved tube 21 and the first straight tube 11, thereby facilitating the penetration of solder, ensuring a certain melting depth, reducing welding requirements, and improving product quality.

[0038] Please continue to refer to Figure 4 , 5 , Figure 4 for Figure 1 A schematic diagram of the middle elbow 21; Figure 5 for Figure 4 Left view of .

[0039] The outer surface of the curved tube 21 is provided with a second knurling 2111. In this embodiment, the inner diameter of the curved tube 21 is not required to be larger than the inner diameter of the first straight tube 11. In order to meet the insertion of the first straight tube 11, the upper end of the curved tube 21 is expanded to form a first expanded end 211 with an increased tube diameter. The inner surface of the first expanded end 211 is used as a welding surface. Along the length direction of the curved tube 21, the length of the first expanded end 211 is h1. The outer surface of the first expanded end 211 is provided with a second knurling 2111, and the second knurling 2111 is arranged around the first expanded end 211. Figure 2 As shown, during welding, the second solder 200 is located between the second knurling 2111 and the inner surface of the first interface portion 31. Here, the second knurling 2111 plays the same role as the first knurling 111, which will not be described in detail.

[0040] As shown in Figures 4 and 5, the length of the second knurling 2111 of the first flared end 211 of the elbow 21 along the length direction of the elbow 21 is L2, which is less than the length h1 of the first flared end 211, that is, the second knurling 2111 is only provided on the upper part of the outer surface of the first flared end 211. Figure 2 , 6 understand, Figure 6 for Figure 1 Schematic diagram of the middle upper end cover 3. In this embodiment, the depths of the first interface portion 3131 and the second interface portion 3232 are both h2, but of course the depths of the two can also be designed to be different. The length h1 of the first flared end 211 is greater than the depth h2 of the first interface portion 31, and the second knurling 2111 only needs to be no less than the depth h2 of the first interface portion 31, that is, L2 is greater than or equal to h2, and L2 is less than or equal to h1.

[0041] In addition, the inner diameter of the first flared end 211 is r2, and the outer diameter of the second knurl 2111 is R2, R2=r2+2t+△r2, wherein t is the wall thickness of the first flared end 211, △r2 is, for example, 0.35 mm, to meet the requirements of assembly and welding, and △r2 can be adjusted according to actual needs.

[0042] It is worth noting that in the present embodiment, the first straight tube 11 and the second straight tube 12 serving as external tubes are both copper tubes, while the curved tube 21 and the U-shaped tube 22 serving as internal tubes are both iron tubes. Based on the difference in materials, the size settings of the first knurling 111 and the second knurling 2111 are slightly different. The radial thickness d1 of the knurling of the copper tube may be smaller than the radial thickness d2 of the knurling of the iron tube to ensure that the strength of the knurling is adapted to the corresponding material.

[0043] Please continue to refer to Figure 7 , 8 , Figure 7 for Figure 1 A schematic diagram of the middle U-shaped tube 22; Figure 8 for Figure 7 Left view of .

[0044] The end of the U-shaped tube 22 connected to the second interface portion 32 in this embodiment is also provided with a second flared end 221 for the second straight tube 12 to be inserted. Figure 3 The structure of the first straight tube 11 is the same as that of the second straight tube 12. The outer surface of the second straight tube 12 is provided with a third knurling. For specific settings, refer to Figure 3 The outer surface of the upper end of the U-shaped tube 22 is provided with a fourth knurling 2211, specifically, the outer surface of the second flared end 221 is provided with a fourth knurling 2211, so as to contact and weld with the second interface portion 32. The third and fourth knurling 2211 have the same functions as the first and second knurling 111 and 2111.

[0045] like Figure 8 As shown, in the length direction of the U-shaped tube 22, the length of the fourth knurling 2211 is L3, the length of the second flared end 221 is h3, the length L3 of the fourth knurling 2211 is less than or equal to the length h3 of the second flared end 221, but greater than or equal to the depth h2 of the second interface portion 32. In addition, in the same manner as the arrangement of the second knurling 2111 of the curved tube 21, the inner diameter of the second flared end 221 of the U-shaped tube 22 is r3, and the outer diameter of the fourth knurling 2211 is R3, R3 = r3 + 2t + △r3, wherein t is the wall thickness of the second flared end 221, △r3 is, for example, 0.35 mm, to meet the requirements of assembly and welding, and △r3 can be adjusted according to actual needs.

[0046] This embodiment also provides a processing technology for the gas-liquid separator. When processing the first straight tube 11 or the second straight tube 12, the specific process includes: blanking → chamfering → knurling → flaring. The chamfering here is used to remove burrs existing when the straight tube is blanked. The knurling step is to process knurling on the outer surface of the lower end of the straight tube, for example Figure 3 The first knurling 111 in Figure 1 As shown, the ends of the first straight tube 11 and the second straight tube 12 away from the upper end cover 31 are also expanded to connect with external pipelines. After the knurling, the expansion can be performed again, but obviously, the knurling can also be performed after the expansion.

[0047] For the bent tube 12 and the U-shaped tube 22, the processing includes the following steps: blanking → chamfering → knurling → flaring → bending. Figure 1 The L-shaped elbow shape and the U-shaped elbow shape shown. It is worth noting that the knurling of the elbow 12 and the U-shaped tube in this embodiment is set at the flared end, so during processing, the process steps of flaring and knurling can be carried out simultaneously, and the flaring tooling also has the knurling processing function, so that the flared end and the knurling are formed in one process step at the same time to save processing steps. Of course, the flaring and knurling processing steps can also be carried out separately. The processing technology in this embodiment is also applicable to the following other embodiments and will not be repeated.

[0048] Please continue to refer to Figure 9-11 , Fig. 9 This is a schematic structural diagram of a U-shaped tube 22 of a gas-liquid separator in a second embodiment of the present application; Fig.10 for Fig. 9 Left view of Fig.11 for Fig.10 AA section view.

[0049] In this embodiment, the second straight tube 12 is not provided with knurling, and both the inner and outer surfaces of the U-shaped tube 22 are provided with knurling, the knurling on the inner surface is used for contact welding with the outer surface of the second straight tube 12, and the knurling on the outer surface is used for contact welding with the inner surface of the second interface portion 32. Fig.10 As shown, the outer surface of the second flared end 221 of the U-shaped tube 22 is provided with a fourth knurling 2211. Figure 8 consistent, and Fig.11 The inner surface of the second flared end 221 of the U-shaped tube 22 is further provided with a fifth knurl 2212, the length of the fifth knurl 2212 is L4, the length L4 of the fifth knurl 2212 is less than or equal to the length h3 of the second flared end 221, the fifth knurl 2212 is mainly used for welding with the outer surface of the lower end of the second straight tube 12, and the length L4 of the fifth knurl 2212 is equal to Figure 3 The length L1 of the first knurling 111 can be equal, or of course can be unequal. The inner diameter of the fifth knurling 2212 only needs to be sufficient to contact the outer surface of the lower section of the second straight tube 12.

[0050] It can be seen that the bent pipe 21 can also be arranged in the manner of the U-shaped pipe 22, that is, the first straight pipe 11 is not provided with the first knurling 111, and the inner surface and outer surface of the bent pipe 21 can be provided with knurling respectively, so as to be respectively used for matching welding with the first straight pipe 11 and the first interface part 31. Specifically, the inner surface and outer surface of the first expanded end 211 of the bent pipe 21 are both provided with knurling, which will not be repeated.

[0051] Look again Fig.12 , Fig.12 Schematic diagram of the structure of the first straight tube 11 in the third embodiment of the present application.

[0052] In the third embodiment, a first knurling 111 is provided on the outer surface of the lower end of the first straight tube 11, but the first knurling 111 is different from the first knurling 111 which is continuously provided in the length direction in the first embodiment. In this embodiment, the first knurling 111 is intermittently provided in the length direction, and the first knurling 111 includes two first knurling segments 1111 and a second knurling segment 1112. The two knurling segments are spaced a certain distance apart in the length direction, and no knurling is provided on the outer surface between the two segments.

[0053] In this way, the first knurled section 1111 is closer to the external port of the first interface portion 31, and the first knurled section 1111, the area between the first knurled section 1111 and the second knurled section 1112, and the second knurled section 1112 form a solder pre-filling area, a solder main filling area, and a solder stop-filling area in sequence. The first knurled section 1111 forms a solder pre-filling area, and the solder passes through the solder pre-filling area at the beginning. The solder pre-filling area can increase the fluidity of the solder, the solder main filling area can ensure the minimum solder melting depth length requirement and serve as a solder solidification area, and the solder stop area can prevent excess solder from accumulating.

[0054] In addition, the length of the first knurled section 1111 is defined as La, the length of the second knurled section 1112 is defined as Lb, and the total length of the three sections is defined as L, and then it can be set as La=Lb=1 / 4L. Of course, the equality here does not require complete equality, as long as it is approximately equal, such a distribution can better meet the functional requirements of each area. Of course, according to the change of the total length L of the specific product, the set ratio can also be adjusted according to actual needs.

[0055] It can be seen that the intermittent knurling is arranged on the first straight tube 11 in the third embodiment, and can also be arranged on other inner tubes or outer tubes. The second straight tube 12, U-shaped tube 22 and curved tube 21 can also be arranged in this way.

[0056] It should be emphasized that in all the embodiments of the present application, the knurling can be a grid structure. The knurling of the grid structure has a more guaranteed strength on the one hand, and on the basis of ensuring the gap and meeting the penetration requirements of the solder, the grid structure has a better uniform distribution effect on the solder.

[0057] It can be seen that in the embodiment of the present application, since at least one of the external pipe and the internal pipe is provided with knurling, the gapless penetration of solder caused by processing and assembly errors can be reduced or avoided to improve leakage and improve welding strength. The processing errors here, such as the dimples of the flared ends of the elbow 21 and the U-shaped pipe 22 are difficult to control, and the gaps are uneven after the corresponding straight pipes are plugged in, part of the weld will be filled with solder, and part of the weld will be fitted without gaps without solder entering. Moreover, the straight pipe is generally a copper pipe, and after the internal pipe, which is generally made of iron, is plugged in, due to the different expansion systems, the tight fit gap may also lead to no gap without or lack of solder penetration. The setting of knurling in the embodiment of the present application can improve or avoid the situation of local no solder penetration. In addition, when the external pipe, the internal pipe and the corresponding interface are assembled in one piece, the gap is difficult to be evenly divided, and the materials are often different. At this time, the solder penetration is difficult to be evenly distributed, and the knurling provided is conducive to the uniform distribution of solder in the circumferential direction, especially the knurling of the grid structure, which is more conducive to the uniform distribution of solder.

[0058] Specific examples are used herein to illustrate the principles and implementation methods of the present application, and the description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A gas-liquid separator, characterized in that: It comprises a shell, the shell is provided with an interface part, the shell is provided with an internal tube inside and an external tube outside, the interface part is connected with a corresponding group of the external tubes and the internal tubes; one of the internal tube and the external tube is inserted into the other and welded and fixed, the other is also inserted into the interface part and welded and fixed, and at least one of the internal tube and the external tube has a knurled surface for welding.

2. The gas-liquid separator according to claim 1, characterized in that: The knurling is a grid structure.

3. The gas-liquid separator according to claim 1, characterized in that: The knurling includes a first knurling segment and a second knurling segment distributed along the length direction of the inner tube or the outer tube, the first knurling segment and the second knurling segment are arranged at intervals, and the area of ​​the inner tube or the outer tube between the first knurling segment and the second knurling segment has no knurling.

4. The gas-liquid separator according to claim 3, characterized in that: The total length of the first knurled segment, the area between the first knurled segment and the second knurled segment, and the second knurled segment in the length direction is L, the length of the first knurled segment is La, the length of the second knurled segment is Lb, and La=Lb=1 / 4L.

5. The gas-liquid separator according to claim 1, characterized in that: The length of the knurling is greater than the depth of the interface portion.

6. The gas-liquid separator according to any one of claim 1, characterized in that: The outer tube is a copper tube, the inner tube is an iron tube, the knurling thickness of the outer tube along the radial direction is d1, and the knurling thickness of the inner tube along the radial direction is d2, wherein d1 <d2。 7. The gas-liquid separator according to any one of claims 1 to 6, characterized in that: The gas-liquid separator includes a U-shaped tube and a curved tube, and the U-shaped tube and the curved tube are both the internal tubes; the gas-liquid separator includes a first straight tube and a second straight tube, and the first straight tube and the second straight tube are both the external tubes; the gas-liquid separator includes two interface parts, one interface part is connected to the curved tube and the first straight tube, and the other interface part is connected to the U-shaped tube and the second straight tube.

8. The gas-liquid separator according to any one of claims 1 to 6, characterized in that: In the inner tube and the outer tube, the outer surface of one and the outer surface of the other are both provided with the knurling, or the inner surface and the outer surface of the other are both provided with the knurling.

9. A gas-liquid separator processing technology, used for processing the gas-liquid separator according to any one of claims 1 to 8, characterized in that: Expanding one end of one of the inner tube and the outer tube to form an expanded end, and inserting the other tube into the expanded end; After the expansion, the knurling is processed on the expansion end; or, while the expansion is being performed, the knurling is processed on the expansion end.

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