Pipe connection structure

Abstract

The application provides a pipe connecting structure for a refrigeration system, which comprises a body and a first pipe, wherein the body comprises at least one connecting end; the first pipe comprises a barrel part and a protruding end part arranged at one end of the barrel part, and the barrel part and the protruding end part are integrated; the connecting end and part of the barrel part are welded, the first pipe comprises at least two protruding parts, the protruding end part comprises a first end face, the first end face faces the connecting end, and the protruding parts are arranged protruding from the first end face to the connecting end. In this way, the convenience and accuracy of checking unqualified products are greatly improved.

Description

Technical Field

[0001] This application pertains to pipe fittings for air conditioning systems, and more specifically, relates to a pipe fitting connection structure. Background Technology

[0002] When welding flanged pipe fittings to the ends of components, external force is required to press the pipe fittings into the connection ends of the components. However, during pressing, a tight and closed state is easily formed, which will affect the welding quality and make it difficult to detect defective products. Utility Model Content

[0003] Therefore, it is necessary to provide a pipe connection structure to address the above problems. The specific technical solution is as follows:

[0004] A pipe fitting connection structure for a refrigeration system includes a body and a first pipe fitting. The body includes at least one connecting end. The first pipe fitting includes a cylindrical portion and a protruding end disposed at one end of the cylindrical portion. The cylindrical portion and the protruding end are integrally formed. The connecting end and a portion of the cylindrical portion are welded together. The first pipe fitting includes at least two protrusions. The protruding end includes a first end face facing the connecting end. The protrusions protrude from the first end face towards the connecting end.

[0005] The pipe fitting connection structure provided in this application reduces the risk of the first end face and the end face of the connection being compressed and closed by setting a protrusion on the first end face. In this way, quality inspectors can judge the penetration of the solder and the welding quality at the welding part by the filling of the solder between the end faces of the first end face and the connection end face, which greatly improves the convenience and accuracy of detecting defective products. In addition, by setting the protrusion, the skill requirements of the press-fitting technicians can be reduced, and the risk of the first end face and the end face of the connection being compressed and closed can be reduced. Attached Figure Description

[0006] Figure 1 A three-dimensional schematic diagram of a pipe fitting connection structure;

[0007] Figure 2 This is a partially enlarged schematic diagram of a pipe fitting connection structure;

[0008] Figure 3 This is a schematic projection of a pipe fitting connection structure.

[0009] Figure 4 for Figure 3 A magnified view of a portion of the image;

[0010] Figure 5 This is a three-dimensional schematic diagram of a first pipe fitting according to one embodiment;

[0011] Figure 6 A schematic projection of a first type of pipe fitting;

[0012] Figure 7 As one embodiment Figure 6 A magnified view of a portion of the image;

[0013] Figure 8 As another embodiment Figure 6 A magnified view of a portion of the image;

[0014] Figure 9 This is a partial cross-sectional schematic diagram of a first pipe fitting according to one embodiment;

[0015] Figure 10 This is a partial cross-sectional schematic diagram of the first pipe fitting according to another embodiment;

[0016] 100. Pipe connection structure; 1. Body; 2. First pipe fitting; 10. Connecting end; 20. Cylindrical part; 21. Protruding end; 3. Protrusion; 211. First end face; 30. Outer edge; 33. Third end face; 34. Fourth end face; 210. Outer peripheral surface; 212. Second end face; 101. Groove part; Detailed Implementation

[0017] To make this application clearer, specific embodiments are described below with reference to the accompanying drawings:

[0018] In air conditioning systems, many components (such as refrigeration components or pipes) need to be welded to other pipes. When welding pipes with flanges to the ends of components, external force is needed to press the pipes into the connecting ends of the components. However, during pressing, the flanges of the pipes are easily pressed tightly against the end faces of the connecting ends, which affects the welding quality and makes it difficult to detect defective products.

[0019] See Figures 1-10To address the aforementioned technical problems, this application provides a pipe fitting connection structure for a refrigeration system. The pipe fitting connection structure 100 includes a body 1 and a first pipe fitting 2. The body 1 includes at least one connecting end 10. The first pipe fitting 2 includes a cylindrical portion 20 and a protruding end 21 disposed at one end of the cylindrical portion 20. The protruding end 21 can be a flanged portion obtained by a flanging process or by machining. The cylindrical portion 20 and the protruding end 21 are integral structures. The connecting end 10 and a portion of the cylindrical portion 20 are welded together. The first pipe fitting 2 includes at least two protrusions 3. The protruding end 21 includes a first end face 211 facing the connecting end 10. The protrusions 3 protrude from the first end face 211 toward the connecting end 10. This design, by providing a protrusion 3 on the first end face 211 of the protruding end 21, creates a gap between the first end face 211 and the end face of the connecting end 10, allowing solder to penetrate into the gap. This allows quality inspectors to judge the solder penetration and welding quality of the welded area by observing the filling of the gap, greatly improving the convenience and accuracy of detecting defective products. In addition, the protrusion 3 reduces the skill requirements for press-fitting technicians and lowers the risk of the first end face 211 and the end face of the connecting end 10 being tightly closed.

[0020] Specifically, the protrusion 3 is provided along the axial direction of the protrusion end 21, and the protrusion 3 protrudes from the first end face 211 toward the connecting end 10; there is an axial gap L between the first end face 211 of the protrusion end 21 and the end face of the connecting end 10, and the protrusion height of the protrusion 3 along the axial direction of the protrusion end 21 is H, satisfying: L≥H. In the process of pressing part of the cylindrical part 20 into the connecting end 10, it is completed by adjusting process parameters such as external pressure, and tooling is used to ensure the depth of pressing of the cylindrical part 20; however, when pressing different specifications of pipe fittings, this requires high precision of tooling, high skill and identification of technicians. During assembly and pressing, the first end face 211 and the end face of the connecting end 10 are easily compressed and closed, affecting the flow of solder and the welding quality. The weld between the cylindrical part 20 and the connecting end 10 is prone to problems such as incomplete welding or insufficient welding strength. Therefore, providing a protrusion 3 on the first end face 211 can reduce the risk of pressure closure between the first end face 211 and the end face of the connecting end 10. The protrusion 3 protrudes along the axial direction of the first pipe fitting 2, which is easier to process compared to protrusions in other directions. Moreover, a protrusion of the same height can withstand greater pressing force, reducing the risk of deformation or even flattening. Furthermore, the relationship between the axial clearance L between the first end face 211 and the end face of the connecting end 10 and the protrusion height H of the protrusion 3 can be understood from the following aspects: when the pressing tooling has good control over the pressing depth, the deformation force applied to the protrusion 3 can be reduced while ensuring a clearance between the first end face 211 and the end face of the connecting end 10; conversely, if the pressing tooling has a slight deviation in controlling the pressing depth, the protrusion 3 can be used to control the pressing depth, preventing the first end face 211 and the end face of the connecting end 10 from being pressed tightly closed. To facilitate inspection of welding quality, the welding ring is designed to be built into the inner side of the connecting end 10. During welding, the solder melts when heated and will penetrate along the mating gap between the cylinder 20 and the connecting end 10 into the gap between the first end face 211 and the connecting end 10. In this way, quality inspectors can easily judge whether the product is qualified by observing the solder filling status in the gap between the first end face 211 and the connecting end 10, greatly improving the convenience and accuracy of quality inspection.

[0021] During press-fitting, if the protrusion height H of the protrusion 3 is too large, it will increase the overall length of the pipe fitting, increase the space occupied, and relatively reduce the effective connection length between the cylinder 20 and the connecting end 10. If the protrusion height H of the protrusion 3 is too small, the press-fitting force can easily deform the protrusion 3, or even flatten it. To solve this problem, the protrusion height H of the protrusion 3 is controlled at 0.2±0.1mm, and the circumferential extension width L1 of the protrusion 3 along the protrusion end 21 is controlled at 0.2±0.1mm. Furthermore, the protrusion 3 includes an outer edge 30, and part of the outer edge 30 abuts against the end face of the connecting end 10. With this configuration, the protrusion 3 acts as a limit, controlling the pressing depth of the cylinder 20, and creating a gap between the first end face 211 and the end face of the connecting end 10, thereby preventing them from being pressed tightly closed.

[0022] Furthermore, the outer edge 30 is an arc-shaped surface, which abuts against the end face of the connecting end 10. The arc-shaped outer edge 30 ensures a proper abutment fit between it and the end face of the connecting end 10. This arc-shaped abutment minimizes the impact on the solder flow path, making it easier for the solder to fill the gap between the first end face 211 and the end face of the connecting end 10, thus improving welding quality. Specifically, the protrusion 3 has a semi-circular cross-section, and the radius R of the semi-circular cross-section satisfies: 0.1mm ≤ R ≤ 0.3mm. The semi-circular cross-section of the protrusion 3 is relatively easy to process; it can be obtained by stamping after the protrusion end 21 is processed, or it can be processed simultaneously with the protrusion end 21. The outer circumferential surface of the protrusion 3 is arc-shaped, allowing it to abut against the end face of the connecting end 10, reducing the impact of the protrusion 3 on the solder flow path and improving welding quality.

[0023] See Figures 5-10 The radial protrusion height of the protruding end 21 is defined as H1, and the radial extension length of the protruding portion 3 along the protruding end 21 is defined as L2, satisfying: L2≤H1. Specifically, the protruding portion 3 includes a third end face 33 and a fourth end face 34, which are disposed opposite to each other at the two ends of the protruding portion 3. The third end face 33 faces the outer wall surface of the cylindrical portion 20, and the fourth end face 34 faces away from the outer wall surface of the cylindrical portion 20. The protruding end 21 includes an outer peripheral surface 210 and a second end face 212, and the outer peripheral surface 210 connects the first end face 211 and the second end face 212. (See reference...) Figure 9 -, Figure 10 The third end face 33 is positioned at a distance from or in contact with the outer wall surface of the cylindrical part 20; and / or, the fourth end face 34 is positioned at a distance from or flush with the outer peripheral surface 210. In other words, the two positional relationships between the third end face 33 and the outer wall surface of the cylindrical part 20, and the two positional relationships between the fourth end face 34 and the outer peripheral surface 210, can be combined with each other.

[0024] To minimize the impact on the solder flow path, it is preferable that the third end face 33 is at a distance from the outer wall surface of the cylinder portion 20, and the fourth end face 34 is at a distance from the outer peripheral surface 210. Here, the distance refers to the radial distance in the radial direction of the protruding end 21.

[0025] However, considering the ease of processing and the size limitations of the protruding end 21 itself, it is preferable that the third end face 33 of the protruding part 3 is in contact with the outer wall surface of the cylindrical part 20, and the fourth end face 34 is flush with the outer peripheral surface 210. Here, "flush" means close to flush, with a certain amount of processing error, not completely flush.

[0026] Furthermore, in order to ensure that the axial gap between each point on the first end face 211 and each point on the end face of the connecting end 10 is uniform, and also to avoid a certain part being pressed tightly together, the number of protrusions 3 is at least two. Specifically, at least two protrusions 3 are evenly distributed in the circumferential direction of the first end face 211.

[0027] The cylindrical body 20 includes a plurality of grooves 101, which are evenly distributed on the outer wall surface of the cylindrical body 20 along its circumference. The grooves 101 can be obtained by wire drawing or by machining. Along the axial direction of the cylindrical body 20, the grooves 101 extend to the first end face 211. The grooves 101 help improve the fluidity of the solder and further improve the welding quality. To reduce the influence of the protrusions 3 on the solder flow path, the protrusions 3 are provided to extend radially along the protrusion end 21 and extend between two adjacent grooves 101, so that the solder will not be blocked by the protrusions 3 when flowing.

[0028] Copper fittings are welded to the ends of stainless steel products to solve the problem of connecting copper pipes or copper interfaces with stainless steel components or connectors. In order to protect the weld seam during welding, the copper fittings have a raised end 21 at the port. Specifically, the body 1 and the first fitting 2 are made of different materials. The body 1 is made of stainless steel and the first fitting 2 is made of copper. The body 1 and the first fitting 2 are connected by brazing. The welding method can be tunnel furnace brazing. Solder is filled between the end face of the raised end 21 and the end face of the connecting end 10.

[0029] The above examples illustrate the principles and implementation methods of the utility model. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A pipe fitting connection structure for a refrigeration system, characterized in that, The pipe fitting connection structure (100) includes a body (1) and a first pipe fitting (2). The body (1) includes at least one connecting end (10). The first pipe fitting (2) includes a cylindrical part (20) and a protruding end (21) disposed at one end of the cylindrical part (20). The cylindrical part (20) and the protruding end (21) are integral structures. The connecting end (10) and part of the cylindrical part (20) are brazed together. The first pipe fitting (2) includes at least two protrusions (3). The protruding end (21) includes a first end face (211). The first end face (211) faces the connecting end (10). The protrusions (3) protrude from the first end face (211) toward the connecting end (10).

2. The pipe fitting connection structure according to claim 1, characterized in that, Along the axial direction of the protruding end (21), the protruding part (3) protrudes from the first end face (211) toward the connecting end (10); there is an axial gap L between the first end face (211) and the end face of the connecting end (10); the protrusion height of the protruding part (3) is H, which satisfies: L≥H.

3. The pipe fitting connection structure according to claim 2, characterized in that, The radial protrusion height of the protruding end (21) is defined as H1, and the length of the protruding part (3) extending radially along the protruding end (21) is L2, satisfying L2≤H1.

4. The pipe fitting connection structure according to claim 3, characterized in that, The protrusion (3) includes a third end face (33) and a fourth end face (34), which are disposed opposite to each other at both ends of the protrusion (3); the protruding end (21) includes an outer peripheral surface (210) and a second end face (212), which connects the first end face (211) and the second end face (212); the third end face (33) is disposed at a distance from or in contact with the outer wall surface of the cylindrical part (20); and / or the fourth end face (34) is disposed at a distance from or flush with the outer peripheral surface (210).

5. The pipe fitting connection structure according to any one of claims 1-4, characterized in that, The protrusion (3) includes an outer edge (30), and a portion of the outer edge (30) and the end face of the connecting end (10) abut against each other.

6. The pipe fitting connection structure according to claim 5, characterized in that, The outer edge (30) is an arc-shaped part, and the outer edge (30) abuts against the end face of the connecting end (10) through the arc-shaped part.

7. The pipe fitting connection structure according to claim 5 or 6, characterized in that, The protrusion (3) and the protrusion end (21) are an integral structure. Along the axial direction of the protrusion end (21), the protrusion height H of the protrusion (3) satisfies: 0.1mm≤H≤0.3mm.

8. The pipe fitting connection structure according to claim 7, characterized in that, The cross-section of the protrusion (3) is semi-circular, and the radius R of the cross-section of the protrusion (3) satisfies: 0.1mm≤R≤0.3mm.

9. The pipe fitting connection structure according to any one of claims 1-8, characterized in that, Along the circumferential direction of the protruding end (21), at least two of the protrusions (3) are evenly distributed on the first end face (211).

10. The pipe fitting connection structure according to claim 9, characterized in that, The body (1) is made of a different material than the first pipe fitting (2). The body (1) is made of stainless steel, while the first pipe fitting (2) is made of copper. The body (1) and the first pipe fitting (2) are connected by brazing. Solder is filled between the end face of the protruding end (21) and the end face of the connecting end (10).

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