A pipe fitting structure

Abstract

The application provides a pipe structure, which comprises a main pipe, wherein the main pipe comprises at least one special-shaped pipe section and at least one connecting hole part arranged on the special-shaped pipe section; the connecting hole part comprises a connecting hole and an extension part, and the connecting hole is formed by processing a wall part of the special-shaped pipe section by a hot melt drill, so that the processing convenience and efficiency of the pipe are relatively improved.

Description

Technical Field

[0001] This application belongs to the field of air conditioning system technology, and specifically relates to a pipe fitting structure used in refrigeration systems. Background Technology

[0002] Many irregularly shaped pipes in air conditioning systems require radial connections to other pipes, such as collection pipes, gas collection pipes, and multi-bend connecting pipes. The holes for connecting to these pipes typically employ a flanged structure. However, due to the irregular shape of these pipes, such as multi-bend pipes, conventional flanged dies are inconvenient to use when processing them. If the pipe is bent first and then the flanged hole is machined, processing efficiency is reduced. If the flanged hole is machined first and then the pipe is bent, not only is the bending fixture inconvenient to arrange, but the machined flanged hole may also deform during bending, affecting the processing efficiency of the pipe and the strength and quality of the connection with the other pipes. Utility Model Content

[0003] Therefore, it is necessary to address the above problems, and the specific technical solutions are as follows:

[0004] A pipe fitting structure includes a main pipe, the main pipe including at least one irregularly shaped pipe segment and at least one connecting hole portion, the connecting hole portion being disposed on the side wall portion of the irregularly shaped pipe segment; the connecting hole portion includes a connecting hole, the connecting hole portion including an extension portion, the extension portion being formed by machining the connecting hole on the side wall portion using a thermoforming drill.

[0005] The pipe fitting structure provided in this application has at least one irregularly shaped pipe segment, such as a bend, a bend, or a main pipe connecting both ends of the bend. This main pipe is prone to deformation due to the stress of the bend during the processing of the bend. The pipe fitting structure improves processing efficiency and reduces the impact of the irregularly shaped pipe segment on the connecting hole by machining the connecting hole with an extension in the irregularly shaped pipe segment using a thermoforming drill. Furthermore, the extension increases the effective connection area between the connecting hole and the subsequent pipe fittings to be connected, further improving the connection strength and quality. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of the first embodiment of the pipe fitting structure;

[0007] Figure 2 This is a schematic diagram of the second embodiment of the pipe fitting structure;

[0008] Figure 3 for Figure 2 A magnified view of part I;

[0009] Figure 4 for Figure 2 A magnified view of part II;

[0010] Figure 5 This is a structural schematic diagram of the third embodiment of the pipe fitting structure;

[0011] Figure 6 This is a projected schematic diagram of the fourth embodiment of the pipe fitting structure;

[0012] 100. Pipe structure; 1. Main pipe; 2. Irregularly shaped pipe section; 22. Side wall section; 3. Connecting hole section; 30. Connecting hole; 31. Extension section; 20. Bend section; 21. Deformation section under stress; 201. First bend section; 202. Second bend section; 210. First side wall section; 2011. First end; 2012. Second end; 2021. Third end; 2022. Fourth end; 311. First extension section; 312. Second extension section; OE. Centerline; 200. Second side wall section; Detailed Implementation

[0013] To make this application clearer, specific embodiments will be described below with reference to the accompanying drawings.

[0014] Many irregularly shaped pipes in air conditioning systems require radial connections to other pipes, such as collection pipes, gas collection pipes, and multi-bend connecting pipes. The holes for connecting to these pipes typically employ a flanged structure. However, due to the irregular shape of the pipe, such as a multi-bend structure, if the pipe is bent first and then the flanged hole is machined, conventional flanged dies are inconvenient to use due to the bends, generally requiring manual flangering, which reduces processing efficiency. If the flanged hole is machined first and then the pipe is bent, multi-bend pipes generally require clamping at multiple locations before bending. Because the flanged hole is machined first, the clamping positions are limited. If the clamp is placed on or near the pipe wall corresponding to the flanged hole, the flanged hole can easily deform, affecting the subsequent connection quality with the other pipes. Furthermore, bending operations can also deform the flanged hole, further affecting the processing efficiency of the pipe structure and the strength and quality of the connection with the other pipes.

[0015] To solve the above technical problems, please refer to Figures 1-6This application provides a pipe fitting structure 100, which includes a main pipe 1, the main pipe 1 including at least one irregularly shaped pipe section 2 and at least one connecting hole portion 3, the connecting hole portion 3 being disposed in the irregularly shaped pipe section 2; the connecting hole portion 3 includes a connecting hole 30, the connecting hole portion 3 including an extension portion 31, the extension portion 31 being formed by machining the connecting hole 30 on the wall of the irregularly shaped pipe section 2 with a thermoforming drill. The pipe fitting structure 100 improves the processing efficiency of the pipe fitting by machining the connecting hole portion 3 with the extension portion 31 on the wall of the irregularly shaped pipe section 2 with a thermoforming drill, and reduces the impact on the structure of the connecting hole portion 3 during the processing of the irregularly shaped pipe section 2; conventional flanges are internal flanges or external flanges, with flange heights ranging from 0-2mm, while the height of the extension portion 31 processed by thermoforming in this application can reach at least 2-4mm. Furthermore, the extension portion 31 increases the effective connection area between the connecting hole portion 3 and the subsequent pipe fittings to be connected, further improving the connection strength and quality. In addition, compared with the common flanging hole processing steps in the background technology, which mainly include hole processing steps such as drilling, punching or laser opening, flanging, and reaming, the process is relatively complex, the quality of the flanged hole is poor, the consistency is not good, and the fit between it and the subsequent pipe fittings is not tight, which is not conducive to subsequent welding connection. In contrast, the connection hole part 3 obtained by the hot melt drilling process has better dimensional consistency and the process is simple.

[0016] Here, we need to explain irregular pipe segment 2. Irregular pipe segment 2 is a non-straight pipe segment. That is to say, irregular pipe segment 2 can be a bent pipe structure, or it can be a section of a bent pipe structure and the main pipe 1 connected to both ends of the pipe segment. This part of the pipe segment is prone to deformation due to the stress generated by the bending deformation when processing the bent pipe structure. For details, please refer to the appendix. Figure 1As shown, this application provides an embodiment of a pipe fitting structure 100. The pipe fitting structure 100 includes a main pipe 1, which includes a shaped pipe section 2 and a connecting hole portion 3. The connecting hole portion 3 is disposed on the side wall of the shaped pipe section 2. Further, the shaped pipe section 2 includes a bent pipe section 20 and a stress-deformation section 21. The stress-deformation section 21 is a portion of the pipe section connected to the bent pipe section 20. This portion of the pipe section is easily deformed by the stress generated by the bending deformation during the processing of the bent pipe structure. The stress-deformation section 21 includes pipe sections located at both ends of the bent pipe section 20. That is, in this embodiment, the stress-deformation section 21 has two parts, which can be a first stress-deformation section and a second stress-deformation section, respectively located at both ends of the bent pipe section 20. The stress-deformation section 21 can be a straight pipe section or a bent pipe structure. Specifically, the bend section 20 includes a first bend section 201, the first bend section 201 and the stress-deformation section 21 are an integral structure, and the connecting hole 3 is provided in the first bend section 201; it can also be provided in the stress-deformation section 21, or the connecting hole 3 can be provided in both the first bend section 201 and the stress-deformation section 21. Furthermore, the stress-deformation section 21 is a straight pipe section, and the connecting hole 3 is provided on the side wall of the stress-deformation section 21. The first bent pipe section 201 includes a first end 2011 and a second end 2012. The first end 2011 is fixedly connected to one end of the stress-deformation section 21, and the second end 2012 is disposed away from the stress-deformation section 21. The angle between the end face of the first end 2011 and the end face of the second end 2012 is defined as α. Along the direction of the center line of the main pipe 1, the minimum distance between the inner wall of the connecting hole 3 and the end face of the first end 2011 is defined as L. The inner diameter D of the main pipe 1 satisfies the following: when α > 90°, ⅓D ≤ L ≤ D; or, when α ≤ 90°, L ≤ ⅓D. In other words, when a > 90°, the bending amplitude of the first bend section 201 is large, and the deformation of the pipe wall is also large. This results in a significant impact on the stress in the stress-bearing deformation section 21. To reduce the impact of the bend stress on the connecting hole 3, L should be set as large as possible; the larger L is, the smaller the impact. When ⅓D ≤ L ≤ D, using traditional flanging methods is relatively difficult and inefficient. However, using a thermoforming drill to process the connecting hole 3 is convenient and further improves efficiency. When a ≤ 90°, the deformation amplitude of the first bend section 201 is relatively small, and the required value of L is relatively lower. When L is less than ⅓D, a thermoforming drill can be used to process the connecting hole 3, which is convenient and further improves efficiency.

[0017] This application also provides an embodiment, see appendix. Figure 2-4 The stress-deformed sections 21 at both ends of the bend 20 are on the same side of the bend 20 and parallel. At this time, the deformation of the bend 20 is particularly large, which has a significant impact on the stress of the stress-deformed section 21. At this time, ⅓D≤L≤D, it is more efficient to use a thermoforming drill to process the connecting hole 3, and the consistency of the connecting hole 3 is better.

[0018] See appendix Figure 5-6 As shown, this application provides another embodiment of the pipe fitting structure 100. The pipe fitting structure 100 includes a main pipe 1, which includes a shaped pipe section 2 and a connecting hole 3. The connecting hole 3 is disposed on the side wall of the shaped pipe section 2. Further, the shaped pipe section 2 includes a bend section 20 and a stress-deformation section 21. The bend section 20 includes a first bend section 201 and a second bend section 202. The stress-deformation section 21 is located between the first bend section 201 and the second bend section 202. During the pipe fitting processing, the stress-deformation section 21 is easily deformed by the stress generated by the bending deformation of the first bend section 201 and the second bend section 202 on both sides. The first bend section 201, the second bend section 202, and the stress-deformation section 21 are an integral structure. The connecting hole 3 is disposed in the first bend section 201; it can also be disposed in the second bend section 202; or it can be disposed in the stress-deformation section 21. Alternatively, connecting holes 3 can be provided in the first bend section 201, the second bend section 202, and the stress-deformation section 21.

[0019] Furthermore, the stress-deformation section 21 is a straight pipe section, and the connecting hole 31 is provided on the first side wall 210 of the stress-deformation section 21. The first bend pipe section 201 includes a first end 2011 and a second end 2012. The first end 201 is fixedly connected to one end of the stress-deformation section 21, and the second end 2012 is disposed away from the stress-deformation section 21. The second bend pipe section 202 includes a third end 2021 and a fourth end 2022. The third end 2021 is fixedly connected to the other end of the stress-deformation section 21, and the fourth end 2022 is disposed away from the stress-deformation section 21. The center O1 of the first bend pipe section 201 and the center O2 of the second bend pipe section 202 are located on the same side or both sides of the main pipe 1. When the center O1 and center O2 are set on both sides of the main pipe 1, the bending stress of the first bend section 201 and the second bend section 202 has a relatively small impact on the stress-deformed section. However, when the center O1 and center O2 are set on the same side, that is, the bending direction of the bend is the same, the deformation of the pipe wall of the first bend section 201 away from the center O1 and the pipe wall of the second bend section 202 away from the center O1 is larger. If the stress-deformed section 21 is set in the connecting hole 3, the bending stress of the connecting hole 3 will have a greater impact on the connecting hole 3 during the processing. Therefore, the distance L between the center line of the connecting hole 3 and the end face of the first end 2011 and the distance L1 between the end face of the third end 2021 are required to be higher.

[0020] Furthermore, when the center O1 and center O2 are located on the same side, the angle between the end face of the first end 2011 and the end face of the second end 2012 is defined as 'a', and the angle between the end face of the third end 2021 and the end face of the fourth end 2022 is defined as 'b'. Along the direction of the center line of the main pipe 1, the minimum distance L between the inner wall of the connecting hole 3 and the end face of the first end 2011, and the minimum distance L1 between the inner wall of the connecting hole 3 and the end face of the third end 2021, satisfy the following: when a > 90° and b > 90°, ⅓D ≤ L ≤ D, ⅓D ≤ L1 ≤ D; or, when a > 90° and b < 90°, ⅓D ≤ L ≤ D, L1 ≤ ⅓D; Alternatively, when a < 90° and b > 90°, L ≤ ⅓D, ⅓D ≤ L1 ≤ D; or when a < 90° and b < 90°, L ≤ ⅓D; L1 ≤ ⅓D. When the position of the connecting hole 3 in the pipe fitting structure meets the above conditions, using hot-melt processing of the connecting hole 3 can improve the processing efficiency of the pipe fitting and the consistency of the connecting hole 3.

[0021] The connecting hole portion 3 includes an extension portion 31, which is integrally formed with the main pipe 1. The extension portion 31 includes a first extension segment 311 and a second extension segment 312 that are interconnected. Along the centerline OE of the connecting hole portion 3, the first extension segment 311 extends from the wall of the main pipe 1 toward the inside of the main pipe 1; the second extension segment 312 extends from the wall of the main pipe 1 toward the outside of the main pipe 1. That is, one of the first extension segment 311 and the second extension segment 312 is on the inside of the main pipe 1, and the other is on the outside of the main pipe 1. In contrast, traditional flanged holes can only form flanges on the inside or outside, and the principle of traditional flanges makes it difficult to achieve a high flange height. Compared with traditional flanged holes, the connecting hole portion 3 in this application has extension portions 31 on both the inside and outside of the main pipe 1, which increases the connection area between the connecting hole portion 3 and the pipe to be connected, thereby ensuring the connection strength between the pipe structure and the pipe to be connected, and further improving the structural stability.

[0022] The irregular pipe section 2 includes a bent pipe section 20, and a connecting hole 3 is located on the second side wall 200 of the bent pipe section 20. The centerline of the connecting hole 3 passes through the center of the bent pipe section 20. This design allows the connecting hole 3 to be cylindrical, meaning that the end faces of the two ends of the extension 31 are parallel, and the projection of the connecting hole 3 onto a plane perpendicular to the centerline of the main pipe 1 is approximately rectangular or square. It should be noted that this parallelism is not perfect, but rather close to parallel. Due to processing errors and the characteristics of hot-melt processing, the material of the main pipe 1, after melting to form the extension 31, cannot achieve the precision required to make the two end faces completely parallel. This design ensures that the circumferential wall of the pipe to be connected has the same length as the connection portion of the extension 31, resulting in more uniform stress and a more stable connection structure. Furthermore, the cross-section of the extension 31 is annular; the inner diameter of the annular shape is equal to the outer diameter of the pipe to be connected, and the annular cross-section has the characteristic of uniform circumferential stress distribution.

[0023] The main pipe 1 of this pipe fitting structure requires good structural strength, ease of processing, and a high melting point to ensure the integrity of its shape and structure during the machining of the connecting hole 3 using a thermoforming drill bit. The main pipe 1 can be made of stainless steel, aluminum, or copper. Furthermore, using stainless steel for the main pipe 1 addresses the issue that traditional flanging techniques, especially for thin-walled stainless steel pipes, can easily lead to cracking at the edge of the through hole, reducing the yield rate. However, by machining the connecting hole 3 using a thermoforming drill bit, the high temperature generated by the friction between the drill bit and the sidewall of the main pipe 1 forces the main pipe 1 to form extensions 31 extending inwards and outwards from the sidewall. This reduces the probability of harmful cracks appearing in the main pipe 1.

[0024] The aforementioned pipe fitting structure can be used in refrigeration products such as collection pipes, connecting pipes, and multi-bend connecting pipes.

[0025] During the process of machining the through-hole connection portion 3 using a hot melt drill, an extension portion 31 is formed extending along the centerline of the connection portion 3. The extension portion 31 increases the effective welding area between the pipe to be connected and the connection portion 3, thereby further improving the connection strength between the two. In addition, the connection portion 3 with the extension portion 31 obtained by hot melt drilling has better dimensional consistency. When it is connected with the pipe to be connected, the inner wall of the connection portion 3 fits better with the outer wall of the pipe to be connected, which is more conducive to the filling of the solder, thereby further improving the welding quality and connection strength.

[0026] Traditional flanged holes can only form flanges on the inner or outer side. Compared with traditional flanged holes, this connecting hole 3 has extensions on both the inner and outer sides of the main pipe 1, which increases the effective connection area between the connecting hole 3 and the pipe to be connected, thereby ensuring the connection strength between the pipe structure and the pipe to be connected, and further improving the structural stability.

[0027] Here's a brief explanation of the working principle of a thermoplastic drill: When the thermoplastic drill rotates at high speed on the surface of the pipe fitting and is subjected to downward axial pressure, the drill head violently rubs against the side wall of the metal pipe fitting, generating high temperatures. This causes the local metal material in contact with the drill bit to heat up, turn red, and soften rapidly. As the axial pressure increases and the feed depth deepens, the contact area between the drill bit and the metal material increases, further increasing the heat generation. The temperature in the processing zone continues to rise, causing the reddened area to expand. As the original molten material inside the hole undergoes thermoplastic flow in both the radial and axial directions under the axial feed and rotation of the drill bit, an extension 31 is formed, and a through hole is quickly machined.

[0028] In the field of air conditioning technology, the use of a thermoforming drill to process this pipe fitting structure optimizes the thin-walled connection hole forming process, allowing the hole opening and flanging processes to be completed in one step. This improves processing efficiency, enhances the quality of flanging, and increases the stability of the connection between pipe fittings. It also reduces the possibility of burrs during processing, increases the mating area between the connection hole 3 and the pipe fitting to be connected, and ensures the brazing penetration depth, thus guaranteeing the stability of the system connection between pipe fittings. Furthermore, the connection hole 3, processed by the thermoforming drill, undergoes a normalizing effect upon air cooling, improving its hardness, rust resistance, and corrosion resistance, thereby enhancing the welding quality during subsequent welding of the pipe fittings.

[0029] The above examples illustrate the principles and implementation methods of the present invention. These embodiments are merely illustrative and intended to aid in understanding the method and core concepts 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 scope of protection of the present invention.

Claims

1. A pipe fitting structure (100), characterized in that, The main pipe (1) includes at least one irregular pipe section (2) and at least one connecting hole (3), the connecting hole (3) being disposed on the irregular pipe section (2); the connecting hole (3) includes a connecting hole (30) and an extension (31), the extension (31) being formed by machining the connecting hole (30) on the wall of the irregular pipe section (2) with a hot melt drill.

2. The pipe fitting structure according to claim 1, characterized in that, The irregular pipe section (2) includes a bent pipe section (20) and a stress-deformed section (21). The bent pipe section (20) includes a first bent pipe section (201). The first bent pipe section (201) and the stress-deformed section (21) are an integral structure. The stress-deformed section (21) is a part of the pipe section connected to the bent pipe section (20). The connecting hole (3) is provided in the stress-deformed section (21).

3. The pipe fitting structure according to claim 1, characterized in that, The irregular pipe section (2) includes a bend section (20) and a stress-deformation section (21). The bend section (20) includes a first bend section (201) and a second bend section (202). The stress-deformation section (21) is located between the first bend section (201) and the second bend section (202). The first bend section (201), the second bend section (202) and the stress-deformation section (21) are an integral structure. The connecting hole (3) is provided in the stress-deformation section (21).

4. The pipe fitting structure according to claim 2, characterized in that, The stress-deformation section (21) is a straight pipe section. The connecting hole (3) is provided on the first side wall (210) of the stress-deformation section (21). The first bent pipe section (201) includes a first end (2011) and a second end (2012). The first end (2011) is fixedly connected to one end of the stress-deformation section (21), and the second end (2012) is located away from the stress-deformation section (21). The angle between the end face of the first end (2011) and the end face of the second end (2012) is defined as a. Along the direction of the center line of the main pipe (1), the minimum distance L between the inner wall of the connecting hole (3) and the end face of the first end (2011) is L. The inner diameter D of the main pipe (1) satisfies the following: when a > 90°, ⅓D ≤ L ≤ D; or, when a ≤ 90°, L ≤ ⅓D.

5. The pipe fitting structure according to claim 3, characterized in that, The stress-deformation section (21) is a straight pipe section. The connecting hole (3) is provided on the first side wall (210) of the stress-deformation section (21). The first bend section (201) includes a first end (2011) and a second end (2012). The first end (2011) is fixedly connected to one end of the stress-deformation section (21), and the second end (2012) is located away from the stress-deformation section (21). The second bend section (202) includes a third end (2021) and a fourth end (2022). The third end (2021) is fixedly connected to the other end of the stress-deformation section (21), and the fourth end (2022) is located away from the stress-deformation section (21). The center (O1) of the first bend section (201) and the center (O2) of the second bend section (202) are located on the same side of the main pipe (1).

6. The pipe fitting structure according to claim 5, characterized in that, Define the angle between the end face of the first end (2011) and the end face of the second end (2012) as α, and the angle between the end face of the third end (2021) and the end face of the fourth end (2022) as β. Along the direction of the center line of the main pipe (1), the minimum distance L between the inner wall of the connecting hole (3) and the end face of the first end (2011), and the minimum distance L1 between the inner wall of the connecting hole (3) and the end face of the third end (2021) satisfying the following: when α > 90° and β > 90°, ⅓D ≤ L ≤ D, ⅓D ≤ L1 ≤ D; or, when α > 90° and β < 90°, ⅓D ≤ L ≤ D, L1 ≤ ⅓D; Alternatively, when a < 90° and b > 90°, L ≤ ⅓D, ⅓D ≤ L1 ≤ D; or when a < 90° and b < 90°, L ≤ ⅓D; L1 ≤ ⅓D.

7. The pipe fitting structure according to any one of claims 1-6, characterized in that, The extension (31) is an integral structure with the main tube (1). The extension (31) includes a first extension section (311) and a second extension section (312) that are connected to each other. Along the center line (OE) of the connecting hole (3), the first extension section (311) extends from the wall of the main tube (1) toward the inside of the main tube (1); the second extension section (312) extends from the wall of the main tube (1) toward the outside of the main tube (1).

8. The pipe fitting structure according to claim 7, characterized in that, The irregular pipe section (2) includes a bent pipe section (20), and the connecting hole (3) is provided on the second side wall (200) of the bent pipe section (20). The center line of the connecting hole (3) passes through the center (O1, O2) of the bent pipe section (20).

9. The pipe fitting structure according to claim 7 or 8, characterized in that, The cross-section of the extension (31) is annular.

10. The pipe fitting structure according to any one of claims 1-9, characterized in that, The main tube (1) is made of stainless steel; or, the main tube (1) is made of aluminum; or, the main tube (1) is made of copper.

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