Gas-liquid separator and processing technology thereof

Abstract

The application provides a gas-liquid separator and a processing technology thereof, which comprises a shell, the shell is provided with an interface part, the inside of the shell is provided with an inner connecting pipe, and the outside of the shell is provided with an outer connecting pipe, the interface part is connected with a corresponding group of the outer connecting pipe and the inner connecting pipe; one of the inner connecting pipe and the outer connecting pipe is inserted into the other and welded and fixed, the other is also inserted into the interface part and welded and fixed, and the surface of at least one of the inner connecting pipe and the outer connecting pipe for welding is provided with knurling. The knurling is beneficial to the penetration of solder, and can improve product leakage and improve welding strength.

Description

Technical Field

[0001] This invention relates to the field of air conditioning system technology, specifically to a gas-liquid separator and its processing technology. Background Technology

[0002] A 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. This prevents liquid refrigerant from entering the compressor and damaging the lubrication or scroll plate, while ensuring that the refrigeration oil returns to the compressor to prevent oil shortage.

[0003] like Figure 13 , 14 As shown, Figure 13 This is a schematic diagram of a gas-liquid separator; Figure 14 for Figure 13 Enlarged view of part I in the middle.

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

[0005] However, due to processing errors, the gap distribution between the U-shaped tube 04, the bend 05, and the corresponding first interface part 07, the second interface part 06, or the first straight tube 02 and the second straight tube 03 is uneven, and there may even be a state without gaps. This will cause the solder to be unable to penetrate and result in leakage and poor welding strength. Summary of the Invention

[0006] The purpose of this application is to provide a gas-liquid separator and its processing technology, wherein the knurling facilitates solder penetration, which can improve product leakage and increase welding strength.

[0007] The gas-liquid separator provided in this application includes a housing, the housing having an interface portion, an inner pipe being provided inside the housing and an outer pipe being provided outside the housing, the interface portion being connected to a corresponding set of the outer pipe and the inner pipe; one of the inner pipe and the outer pipe is inserted into the other and welded to fix it, the other pipe is also inserted into the interface portion and welded to fix it, and at least one of the inner pipe and the outer pipe has a knurled surface for welding.

[0008] In this application, since at least one of the outer and inner pipes is knurled, it can reduce or avoid gapless solder penetration caused by processing and assembly errors, thereby improving leakage and increasing welding strength. In addition, when the outer and inner pipes and their corresponding interfaces are assembled as a single unit, the gaps are difficult to distribute evenly, and the materials are often different. In this case, it is difficult to distribute solder penetration evenly, while the knurling facilitates the uniform distribution of solder. Attached Figure Description

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

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

[0011] Figure 3 for Figure 1 A schematic diagram of the first straight pipe in the middle;

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

[0013] Figure 5 for Figure 4 The left view;

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

[0015] Figure 7 for Figure 1 A schematic diagram of a U-shaped tube;

[0016] Figure 8 for Figure 7 The left view;

[0017] Figure 9 This is a schematic diagram of the U-shaped tube of the gas-liquid separator in the second embodiment of this application;

[0018] Figure 10 for Figure 9 The left view;

[0019] Figure 11 for Figure 10 Sectional view along line AA;

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

[0021] Figure 13 This is a schematic diagram of a gas-liquid separator;

[0022] Figure 14 for Figure 13 Enlarged view of part I in the middle.

[0023] Figure 1-14 The annotations in the attached figures are explained as follows:

[0024] 11-First straight pipe; 111-First knurled section; 1111-First knurled section; 1112-Second knurled section; 12-Second straight pipe;

[0025] 21-Bend; 211-First flared end; 2111-Second knurling; 22-U-shaped pipe; 221-Second flared end; 2211-Fourth knurling; 2212-Fifth knurling;

[0026] 3-Upper end cover; 31-First interface section; 32-Second interface section;

[0027] 100 - First solder; 200 - Second solder;

[0028] 01-Shell; 02-First straight pipe; 03-Second straight pipe; 04-U-shaped pipe; 05-Bend pipe; 06-Second interface section; 07-First interface section; 08-Solder. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Please refer to Figure 1 , Figure 1 This is a partial structural diagram of the gas-liquid separator in the first embodiment of this application, showing only the upper end cover 3, U-shaped pipe 22, bend 21, first straight pipe 11, and second straight pipe 12 of the gas-liquid separator.

[0031] The gas-liquid separator includes a shell. In this embodiment, the shell consists of a cylindrical body and an upper end cover 3 and a lower end cover located at its upper and lower ends. Figure 1 Only the upper end cover 3 of the housing is shown in the diagram. The housing is provided with an interface portion, which is either a first interface portion 31 or a second interface portion 32. That is, the housing has two interface portions, which are used for the inflow and outflow of refrigerant, respectively. The refrigerant can enter from the first interface portion 31 and flow out from the second interface portion 32. In this embodiment, the top of the upper end cover 3 is provided with an upwardly extending annular flange. The annular flange forms part of the first interface portion 31 or the second interface portion 32. 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 upper end cover 3 at the penetration position.

[0032] The housing has an inner connecting pipe inside and an outer connecting pipe outside, with each interface connected to a corresponding set of outer and inner connecting pipes. In this embodiment, two inner connecting pipes and two outer connecting pipes are provided. The two inner connecting pipes are respectively... Figure 1The U-shaped pipe 22 and the bend 21 shown have two external connecting pipes respectively. Figure 1 The first straight pipe 11 and the second straight pipe 12 are shown. One of the inner and outer pipes is inserted into the other and welded in place, while the other is inserted into the corresponding interface and welded in place. At least one of the inner and outer pipes has knurled surfaces for welding. Specifically, the first straight pipe 11, the bend 21, and the first interface 31 are connected; the second straight pipe 12, the U-shaped pipe 22, and the second interface 32 are connected, all by welding. When refrigerant flows in, it enters the housing of the gas-liquid separator through the bend 21. The liquid refrigerant sinks, while the gaseous refrigerant can enter from one port of the U-shaped pipe 5 and flow from the other port of the U-shaped pipe 5 to the second straight pipe 12, thus exiting the gas-liquid separator. The internal pipe is not limited to the installation of the bend 21. In some types of gas-liquid separators, the bend 21 is not required. Other airflow guiding structures can be installed so that the gas and liquid refrigerants can rotate and separate in the gas-liquid separator. The internal pipe is also not limited to the installation of the U-shaped pipe 5. As long as it has two ports, one for the entry of gaseous refrigerant and the other for connection with the second interface 32 and the second straight pipe 12, it is sufficient.

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

[0034] In this embodiment, the lower end of the first straight pipe 11 is inserted into the upper end of the bent pipe 21, the upper end of the bent pipe 21 is inserted into the first interface portion 31, the first straight pipe 11 and the bent pipe 21 are welded together, and the bent pipe 21 is also welded to the first interface portion 31. Figure 2 The diagram illustrates the first solder 100 between the bend 21 and the first straight pipe 11, and the second solder 200 between the bend 21 and the first interface portion 31.

[0035] Let's look again. Figure 3 , Figure 3 for Figure 1 A schematic diagram of the first straight tube 11.

[0036] In this embodiment, the lower end of the first straight pipe 11 is inserted into the upper end of the bent pipe 21. The outer surface of the lower end of the first straight pipe 11 is a welding surface, which can be knurled, defined as the first knurl 111. Along the length of the first straight pipe 11, the length of the first knurl 111 is L1, and the first knurl 111 is arranged around the lower end of the first straight pipe 11. The outer diameter of the first knurl 111 is R1. When the lower end of the first straight pipe 11 is inserted into the upper end of the bent pipe 21, the first knurl 111 of the first straight pipe 11 contacts the inner surface of the upper end of the bent pipe 21. If the outer diameter of the lower end of the first straight pipe 11 is defined as r1, then the outer diameter R1 of the first knurl 111 is r1 + Δr1, where Δr1 is, for example, 0.25 mm, to meet the requirements of assembly and welding. Δr1 can be adjusted according to actual needs.

[0037] In this embodiment, knurling is provided on at least one of the outer or inner pipe to ensure the consistency of the assembly process. For example, errors may occur during the processing and assembly of the first straight pipe 11 and the bend 21. During assembly, if the first straight pipe 11 is completely attached to the bend 21, the knurling can fit against the outer surface of the bend 21 due to the presence of the first knurling 111. However, there will inevitably be gaps between the knurling strips of the first knurling 111, which can still ensure that there is a certain gap between the bend 21 and the first straight pipe 11. This facilitates the penetration of the solder, ensures a certain penetration depth, reduces welding requirements, and improves product quality.

[0038] Please continue to refer to this. Figure 4 , 5 , Figure 4 for Figure 1 Schematic diagram of the middle bend 21; Figure 5 for Figure 4 The left view.

[0039] The outer surface of the bend 21 is provided with a second knurling 2111. In this embodiment, the inner diameter of the bend 21 is not required to be greater than the inner diameter of the first straight pipe 11. In order to accommodate the insertion of the first straight pipe 11, the upper end of the bend 21 is flared to form a first flared end 211 with an increased pipe diameter. The inner surface of the first flared end 211 serves as the welding surface. Along the length direction of the bend 21, the length of the first flared end 211 is h1. The outer surface of the first flared end 211 is provided with a second knurling 2111, which surrounds the first flared 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 and the first knurling 111 mentioned above play the same role, which will not be described again.

[0040] As shown in 4 and 5, the length of the second knurling 2111 of the first flared end 211 of the bend 21 along the length direction of the bend 21 is L2. L2 is less than the length h1 of the first flared end 211, meaning that 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 A schematic diagram of the upper end cover 3. In this embodiment, the depth of the first interface portion 3131 and the second interface portion 3232 is both h2. 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. 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 knurled end 2111 is R2, where R2 = r2 + 2t + Δr2, t is the wall thickness of the first flared end 211, and Δr2 is, for example, 0.35mm, to meet the requirements of assembly and welding. Δr2 can be adjusted according to actual needs.

[0042] It is worth noting that in this embodiment, the first straight pipe 11 and the second straight pipe 12, which are the outer connecting pipes, are both copper pipes, while the bent pipe 21 and the U-shaped pipe 22, which are the inner connecting pipes, are both iron pipes. Due to the different materials, the size settings of the first knurling 111 and the second knurling 2111 are also slightly different. The thickness d1 of the knurling in the radial direction of the copper pipe can be smaller than the thickness d2 of the knurling in the radial direction of the iron pipe, so as to ensure that the strength of the knurling is adapted to the corresponding material.

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

[0044] In this embodiment, the end of the U-shaped tube 22 connected to the second interface portion 32 is also provided with a second flared end 221 to allow the second straight tube 12 to be inserted. The structure of the second straight tube 12 is similar to... Figure 3 The first straight tube 11 has the same structure, while the outer surface of the second straight tube 12 is provided with a third knurling. For details, refer to [reference needed]. Figure 3 The details will not be elaborated further. The upper outer surface of the U-shaped tube 22 is provided with a fourth knurling 2211. Specifically, the fourth knurling 2211 is provided on the outer surface of the second flared end 221 for contact and welding with the second interface part 32. The functions of the third knurling and the fourth knurling 2211 are the same as those of the first knurling 111 and the second knurling 2111 mentioned above.

[0045] like Figure 8 As shown, along the length of the U-shaped tube 22, the length of the fourth knurling 2211 is L3, and 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. Furthermore, similar to the arrangement of the second knurling 2111 in the bent 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, where R3 = r3 + 2t + Δr3, where t is the wall thickness of the second flared end 221, and Δr3 is, for example, 0.35 mm to meet assembly and welding requirements. Δr3 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 pipe 11 or the second straight pipe 12, the specific process includes: blanking → chamfering → knurling → flaring. The chamfering is used to remove burrs present during the blanking of the straight pipe. The knurling step involves processing knurling on the outer surface of the lower end of the straight pipe, for example... Figure 3 The first knurling 111 in the middle, such as Figure 1 As shown, the ends of the first straight pipe 11 and the second straight pipe 12 away from the upper end cap 31 are also flared to connect with external pipes. After knurling, the ends can be flared again, but obviously, it is also possible to flare and then knurl.

[0047] For bend 12 and U-shaped pipe 22, the processing steps include: blanking → chamfering → knurling → flaring → bending. The bending step involves bending the blanked straight pipe into... Figure 1 The L-shaped and U-shaped bends are shown. It is worth noting that in this embodiment, the knurling of the bend 12 and the U-shaped tube is located at the flared end. Therefore, during processing, the flaring and knurling processes can be performed simultaneously. The flaring fixture also functions as a knurling tool, thus forming the flared end and knurling in a single process step, saving processing steps. Of course, the flaring and knurling processes can also be performed separately. The processing technology in this embodiment is also applicable to the other embodiments described below, and will not be repeated here.

[0048] Please continue to refer to this. Figure 9-11 , Figure 9 This is a schematic diagram of the structure of the U-shaped tube 22 of the gas-liquid separator in the second embodiment of this application; Figure 10 for Figure 9 The left view; Figure 11 for Figure 10 Sectional view along the AA direction.

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

[0050] It can be seen that the bend 21 can also be set in the same way as the U-shaped tube 22, that is, the first straight tube 11 does not have the first knurling 111, and the inner and outer surfaces of the bend 21 can be knurled respectively, so as to be used for welding with the first straight tube 11 and the first interface part 31 respectively. Specifically, the inner and outer surfaces of the first flared end 211 of the bend 21 are both knurled, which will not be discussed again.

[0051] Let's look again. Figure 12 , Figure 12 This is a schematic diagram of the structure of the first straight tube 11 in the third embodiment of this application.

[0052] In the third embodiment, the lower end of the outer surface of the first straight tube 11 is provided with a first knurling 111. However, the first knurling 111 is different from the first knurling 111 in the first embodiment, which is continuously provided in the length direction. In this embodiment, the first knurling 111 is intermittently provided in the length direction. 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 them.

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

[0054] Furthermore, let's define the length of the first knurled section 1111 as La, the length of the second knurled section 1112 as Lb, and the total length of the three sections as L. Then, we can set La = Lb = 1 / 4L. Of course, this equality doesn't require exact matching; approximate equality is sufficient. This allocation better meets the functional requirements of each area. Naturally, the ratio can be adjusted according to actual needs, depending on the specific product's total length L.

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

[0056] It should be emphasized that in all embodiments of this application, the knurling can be a mesh structure. The knurling of the mesh structure not only ensures greater strength, but also provides better uniform distribution of the solder while ensuring the gap and meeting the requirements for solder penetration.

[0057] Therefore, in this embodiment, the knurling on at least one of the outer and inner pipes reduces or avoids gapless solder penetration caused by processing and assembly errors, thereby improving leakage and increasing welding strength. Processing errors, such as the difficulty in controlling the notch at the flared end of the bend 21 and U-shaped pipe 22, and uneven gaps after insertion with the corresponding straight pipe, can result in some welds being filled with solder while others are tightly fitted without gaps and solder penetration. Furthermore, since straight pipes are generally made of copper, the different expansion systems of the inner pipe (usually made of iron) can lead to excessively tight fits, potentially resulting in no or insufficient solder penetration. The knurling in this embodiment improves or avoids situations where solder penetration is absent in certain areas. Additionally, when the outer and inner pipes and their corresponding interfaces are assembled as a single unit, the gaps are difficult to distribute evenly, and the materials are often different. In such cases, even solder penetration is difficult to achieve. Knurling facilitates uniform circumferential solder distribution, especially knurling with a grid structure, which further promotes uniform solder distribution.

[0058] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A gas-liquid separator, characterized in that, The device includes a housing with an interface portion. An inner tube is located inside the housing, and an outer tube is located outside the housing. The interface portion is connected to a corresponding set of the outer tubes and the inner tube. One of the inner tubes and the outer tubes is inserted into the other and welded in place. The other tube is also inserted into the interface portion and welded in place. At least one of the inner tubes and the outer tubes has a knurled surface for welding. The knurling includes a first knurled section and a second knurled section distributed along the length direction of the inner or outer tube, the first and second knurled sections being spaced apart, and the area of ​​the inner or outer tube located between the first and second knurled sections having no knurling. The first knurled segment, the region between the first knurled segment and the second knurled segment, and the total length of the second knurled segment in the length direction are L, the length of the first knurled segment is La, the length of the second knurled segment is Lb, and La = Lb = 1 / 4L; The length of the knurling is greater than the depth of the interface portion.

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 or 2, characterized in that, The outer tube is a copper tube, and the inner tube is an iron tube. The radial thickness of the knurling on the outer tube is d1, and the radial thickness of the knurling on the inner tube is d2, wherein d1 <d2。 4. The gas-liquid separator according to claim 1 or 2, characterized in that, The gas-liquid separator includes a U-shaped tube and a bend, both of which are internal connecting pipes; the gas-liquid separator includes a first straight pipe and a second straight pipe, both of which are external connecting pipes; the gas-liquid separator includes two interface sections, one of which is connected to the bend and the first straight pipe, and the other of which is connected to the U-shaped tube and the second straight pipe.

5. The gas-liquid separator according to claim 1 or 2, 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.

6. A processing method for a gas-liquid separator, used to process the gas-liquid separator according to any one of claims 1-5, characterized in that, One end of one of the inner tube and the outer tube is flared to form a flared end, and the other tube is inserted into the flared end; After flaring, the knurling is processed at the flared end; or, the knurling is processed at the end of the flared end while flaring is being performed.

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