Pipe connection structure

Abstract

The utility model discloses a kind of pipe fitting connecting structure, including the protective tube of being sleeved between two groups of pipe fittings, the protruding connecting part is equipped at the both ends of protective tube, and connecting part end face is equipped with pipe groove;The both sides of pipe groove are outer layer pipe wall and inner layer pipe wall respectively, and toothed structure in the form of thread line distribution is equipped on outer layer pipe wall, and the tip of each tooth is rounded structure;Sealing sleeve is further equipped in the pipe groove, sealing sleeve is closely attached to inner layer pipe wall, and end portion is outwardly bent, and the groove bottom of pipe groove is attached to each other.The utility model is provided with rounded tooth tip thread line toothed structure on the outer layer pipe wall of pipe groove, and local stress can be dispersed when embedding;While the interference fit design of pipe groove and pipe fitting, without strictly matching pipe groove and pipe fitting pipe wall thickness, interference amount can compensate small range thickness deviation, reduce the processing precision requirement.

Description

Technical Field

[0001] This utility model relates to the field of pipe fittings technology, and in particular to a pipe fitting connection structure. Background Technology

[0002] Currently, most plastic pipes on the market are connected by threads. However, threaded connections are prone to loosening over time and may leak due to deformation of the plastic pipe fittings.

[0003] CN222836453U discloses a connection structure for PVC pipe fittings, including a protective outer tube fitted between two sets of PVC pipes; a protective inner tube is provided inside the protective outer tube, a pipe groove is provided between the protective outer tube and the protective inner tube, and a set of blades is provided in the pipe groove on the inner wall of the protective outer tube; the outer edge of the blade set is a sharpened edge, the thickness of the blade set is half the distance between the protective outer tube and the protective inner tube, and the blade set cuts into the outer wall of the PVC pipe end. This structure achieves fixation by screwing the blade set inside the protective outer tube into the outer wall of the PVC pipe, while a sealing collar ensures a tight seal.

[0004] While the above structure solves the problem of leakage caused by PVC pipe deformation in traditional threaded connections, the blade assembly has several drawbacks. The blades are sharpened, which can create localized stress concentration on the PVC pipe wall during cutting, potentially leading to cracking in low-temperature or aging PVC pipe conditions. Furthermore, the groove specifications must be precisely matched to the PVC pipe wall thickness, increasing the precision requirements for machining. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a pipe fitting connection structure that can effectively improve the connection stability of plastic pipes.

[0006] Therefore, the technical solution of this utility model is: a pipe fitting connection structure, including a protective pipe fitted between two sets of pipe fittings, with protruding connecting parts at both ends of the protective pipe, and a pipe groove opened on the end face of the connecting part; the two sides of the pipe groove are an outer pipe wall and an inner pipe wall, respectively, and the outer pipe wall is provided with a tooth-like structure distributed in a spiral pattern, with the tip of each tooth having a rounded corner structure; a sealing sleeve is also provided inside the pipe groove, the sealing sleeve is tightly attached to the inner pipe wall, and the end is bent outward to fit against the bottom of the pipe groove.

[0007] Based on the above scheme and as a preferred embodiment of the above scheme: the sealing sleeve is made of EPDM rubber or fluororubber, and the sealing sleeve has at least one raised retaining ring on the side facing the toothed structure.

[0008] Based on the above scheme and as a preferred embodiment of the above scheme: the lateral inclination angle between the tooth shape on the tooth structure and the outer tube wall is 10~15 degrees, and the height of the tooth shape is 1 / 4~1 / 3 of the tube groove thickness.

[0009] Based on the above scheme and as a preferred embodiment of the above scheme: the radial thickness of the pipe groove is equal to or slightly less than the sum of the pipe wall thickness and the thickness of the sealing sleeve of the pipe fitting, that is, the end of the pipe fitting is interference-fitted with the pipe groove with the sealing sleeve.

[0010] Based on the above scheme and as a preferred embodiment of the above scheme: an axial reinforcing rib is provided between the protruding connecting parts at both ends of the protective tube.

[0011] In use, first place the sealing sleeve into the pipe groove, align the ends of the two sets of pipe fittings to be connected with the pipe grooves at both ends of the protective pipe, and apply axial force to the ends of the pipe fittings to embed them into the pipe groove, forming an interference fit. Simultaneously, rotate the protective pipe to allow the threaded tooth structure of the outer pipe wall to screw into the outer wall of the fitting. The rounded tooth tips prevent scratching the pipe wall, and the 10-15° lateral tilt angle ensures that the toothed structure can bite into the outer wall of the fitting to form a mechanical lock, while also reducing resistance during reverse disassembly. After the fitting is fully embedded, the interference fit causes the inner wall of the fitting to tightly press the sealing sleeve in the pipe groove. The sealing sleeve deforms under pressure, and the protruding retaining ring on the side facing the toothed structure will embed into the tiny gaps in the inner wall of the fitting, forming the primary seal. At the same time, the fitting structure between the end of the sealing sleeve and the bottom of the pipe groove prevents fluid leakage from the end of the pipe groove, forming an auxiliary seal. The toothed structure of the outer pipe wall, through the interlocking action of the distributed threaded lines, restricts the axial loosening and circumferential rotation of the fitting, and combined with the clamping force of the interference fit, achieves a secure connection.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. A threaded tooth structure with rounded corners and sharp tips is set on the outer wall of the tube groove. When embedded, it can disperse local stress and effectively avoid tube wall cracking in low temperature or aging scenarios. At the same time, the interference fit design of the tube groove and the fitting does not require strict matching of the tube groove and fitting wall thickness. The interference can compensate for small thickness deviations and reduce the processing accuracy requirements.

[0013] 2. The bent structure at the end of the sealing sleeve can block the leakage path at the end of the pipe groove. The raised retaining ring can be embedded into the gap of the inner wall of the pipe through interference compression to achieve a double sealing effect. Compared with the single soft rubber ring of the existing technology, the sealing path is more comprehensive, and the aging resistance and fluid impact resistance are stronger, making it less prone to failure after long-term use.

[0014] 3. The toothed structure with threaded distribution and interference fit form a dual fixing effect of mechanical locking and clamping fixation, which will not easily loosen; at the same time, the 10~15° lateral tilt angle design between the toothed shape and the outer wall of the pipe greatly reduces the friction between the toothed structure and the outer wall of the pipe when rotating in the opposite direction. Compared with the fixed structure of the existing technology, disassembly is easier and less likely to damage the pipe, and the pipe can be reused.

[0015] 4. The axial reinforcing ribs between the two ends of the protective pipe enhance the overall resistance to deformation, preventing the protective pipe from deforming due to external installation forces or fluid pressure, thereby ensuring the stability of the toothed interlocking and sealing structure and extending the service life of the connection structure. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the structure of this utility model; Figure 3 for Figure 2 A magnified view of a portion of the image.

[0017] The components are marked as follows: protective pipe 1, connecting part 11, reinforcing rib 12, pipe groove 13, outer pipe wall 14, inner pipe wall 15, toothed structure 16, sealing sleeve 2, annular sealing surface 21, and retaining ring 22. Detailed Implementation

[0018] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0020] See the attached drawings. The pipe connection structure described in this embodiment includes a protective pipe 1 fitted between two sets of pipes. The protective pipe can be made of high-strength PVC-U composite resin. The protective pipe 1 has protruding connecting parts 11 at both ends, thereby increasing the thickness of the connecting parts 11 and preventing cracking and deformation. Furthermore, an axial reinforcing rib 12 is provided between the protruding connecting parts 11 at both ends of the protective pipe 1. While increasing the strength, the reinforcing rib 12 can also serve as a grip when rotating the protective pipe 1, preventing slippage during rotation.

[0021] The end face of the connecting part 11 is provided with a pipe groove 13, and the two sides of the pipe groove 13 are an outer pipe wall 14 and an inner pipe wall 15, respectively. The outer pipe wall 14 is provided with a tooth-like structure 16 distributed in a spiral pattern, and the tip of each tooth is a rounded structure. The lateral inclination angle between the tooth shape on the tooth-like structure 16 and the outer pipe wall 14 is 10 to 15 degrees, and the height of the tooth shape is 1 / 4 to 1 / 3 of the thickness of the pipe groove.

[0022] The pipe groove 13 is also provided with a sealing sleeve 2, which is made of EPDM rubber or fluororubber. The sealing sleeve 2 is tightly attached to the inner pipe wall 15, and its end is bent outward to form an annular sealing surface 21, which fits against the bottom of the pipe groove 13. The sealing sleeve 2 has at least one raised retaining ring 22 on the side facing the toothed structure. The annular sealing surface 21 at the end of the sealing sleeve 2 can block the leakage path at the end of the pipe groove, and the raised retaining ring 22 can be embedded into the gap of the inner wall of the pipe by interference compression to achieve a double sealing effect.

[0023] The radial thickness of the groove 13 is equal to or slightly less than the sum of the pipe wall thickness and the thickness of the sealing sleeve 2. That is, the end of the pipe is interference-fitted with the groove 13 with the sealing sleeve 2, so that the wall thickness of the groove and the pipe does not need to be strictly matched. The interference can compensate for small thickness deviations and reduce the processing accuracy requirements.

[0024] In use, first place the sealing sleeve into the pipe groove, align the ends of the two sets of pipe fittings to be connected with the pipe grooves at both ends of the protective pipe, and apply axial force to the ends of the pipe fittings to embed them into the pipe groove, forming an interference fit; while embedding, the protective pipe can be rotated simultaneously, so that the threaded tooth structure of the outer pipe wall screws into the outer wall of the pipe fitting. After the pipe fitting is fully embedded, the interference fit causes the inner wall of the pipe fitting to tightly press the sealing sleeve in the pipe groove. The sealing sleeve is deformed by compression, and the protruding retaining ring on the side facing the toothed structure will embed into the tiny gaps in the inner wall of the pipe fitting, forming the main seal; at the same time, the fitting structure between the end of the sealing sleeve and the bottom of the pipe groove can prevent fluid from leaking from the end of the pipe groove, forming an auxiliary seal; the toothed structure of the outer pipe wall, through the interlocking action of the distributed thread lines, restricts the axial loosening and circumferential rotation of the pipe fitting, and combined with the clamping force of the interference fit, achieves connection and fixation.

[0025] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A pipe fitting connection structure, comprising a protective pipe fitted between two sets of pipe fittings, characterized in that: The protective pipe has protruding connecting parts at both ends, and the connecting parts have grooves on their end faces; the two sides of the groove are an outer pipe wall and an inner pipe wall, respectively. The outer pipe wall has a toothed structure distributed in a spiral pattern, and the tips of each tooth are rounded; a sealing sleeve is also provided inside the groove. The sealing sleeve is tightly attached to the inner pipe wall, and its end is bent outward to fit against the bottom of the groove.

2. The pipe fitting connection structure as described in claim 1, characterized in that: The sealing sleeve is made of EPDM rubber or fluororubber, and the sealing sleeve has at least one raised retaining ring on the side facing the toothed structure.

3. The pipe fitting connection structure as described in claim 1, characterized in that: The lateral inclination angle between the teeth on the toothed structure and the outer tube wall is 10 to 15 degrees, and the height of the teeth is 1 / 4 to 1 / 3 of the tube groove thickness.

4. The pipe fitting connection structure as described in claim 1, characterized in that: The radial thickness of the groove is equal to or slightly less than the sum of the pipe wall thickness and the sealing sleeve thickness of the fitting, that is, the end of the fitting is interference-fitted with the groove with the sealing sleeve.

5. The pipe fitting connection structure as described in claim 1, characterized in that: The protective tube has axial reinforcing ribs between the protruding connecting parts at both ends.

Images