Pipe joint and insertion pipe structure

Abstract

The utility model relates to the technical field of pipelines, in particular to a pipe joint and an inserting pipe structure, the pipe joint comprises a pipe joint body, and annular positioning grooves are formed in the outer wall surfaces of the two ends of the pipe joint body; the sealing piece is fixed to the pipe joint body and located in the annular positioning groove, the periphery of the sealing piece protrudes relative to the annular positioning groove to form a sealing lip, the sealing lip is provided with a first inclined face and a second inclined face which are connected, the first inclined face faces the end of the pipe joint body, and the second inclined face faces the end of the pipe joint body. The second inclined face deviates from the end of the pipe joint body, and the included angle between the first inclined face and the axis of the pipe joint body is larger than the included angle between the second inclined face and the axis of the pipe joint body. The utility model can ensure the reliable sealing effect and is convenient to use.

Description

Technical Field

[0001] The utility model relates to the technical field of pipelines, in particular to a pipe joint and an inserted pipe structure. Background Art

[0002] The connection of oil pipelines, water pipelines and gas pipelines on the periphery of an engine requires corresponding pipelines. Since there are often axial or radial dimensional errors at both ends of a long pipeline, a pipe joint with the ability to adjust dimensional errors is needed to realize the connection of these pipelines and meet the sealing performance requirements at the same time.

[0003] In the prior art, there are two forms of pipe joints adopted. The first one is: by casting and processing O-ring rubber seal grooves at both ends of the pipe joint and cooperating with O-ring rubber seals of corresponding sizes, and inserting them together into the two pipe orifices to be connected to realize the connection and sealing of the pipeline. The second one is: by vulcanizing a layer of rubber on the outer side of the pipe joint and vulcanizing raised sealing lips at both ends, and inserting them into the two pipe orifices to be connected to realize the connection and sealing of the pipeline.

[0004] Among them, the first method has the following disadvantages: when the O-ring rubber seal is sleeved into the grooves at both ends of the pipe joint, the O-ring rubber seal is easily scratched, and the assembly of the O-ring rubber seal increases the assembly process. During the plug-in installation, the O-ring rubber seal is prone to roll and twist, resulting in seal failure. The second method has the following disadvantages: there is no structural limit at the sealing lip part, the rubber deformation compression rate is not accurately controlled, and the sealing effect is unreliable. Moreover, the whole outer surface of the pipe joint is vulcanized with rubber, and the cost is relatively high. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a pipe joint and an inserted pipe structure, which can ensure a reliable sealing effect and is convenient to use.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The pipe joint includes:

[0008] A pipe joint body, on the outer wall surfaces at both ends of the pipe joint body, there are annular positioning grooves;

[0009] A seal, the seal is fixed on the pipe joint body and is located in the annular positioning groove. The outer periphery of the seal protrudes relative to the annular positioning groove to form a sealing lip. The sealing lip has a connected first inclined surface and a second inclined surface. The first inclined surface faces the end of the pipe joint body, and the second inclined surface faces away from the end of the pipe joint body. The included angle between the first inclined surface and the axis of the pipe joint body is greater than the included angle between the second inclined surface and the axis of the pipe joint body.

[0010] In some embodiments, the seal is fixed to both the side wall surface and the bottom surface of the annular positioning groove.

[0011] In some embodiments, the end of the pipe joint body has a first shoulder and a second shoulder that are relatively spaced apart, and the first shoulder, the second shoulder, and the outer peripheral surface of the pipe joint body enclose to form the annular positioning groove.

[0012] In some embodiments, the distance between the first shoulder and the nearest end of the pipe joint body is less than the distance between the second shoulder and the nearest end of the pipe joint body, and the outer diameter of the first shoulder is less than the outer diameter of the second shoulder.

[0013] In some embodiments, the first shoulder, the second shoulder, and the pipe joint body are of an integral structure.

[0014] In some embodiments, both the first inclined surface and the second inclined surface are arc-shaped surfaces.

[0015] In some embodiments, the outer periphery of the seal protrudes relative to the annular positioning groove to form a plurality of seal lips.

[0016] In some embodiments, the end of the pipe joint body has a first chamfered portion.

[0017] An inserted pipe structure, comprising two butt pipes and a pipe joint as described above, and the pipe joint body of the pipe joint is inserted into the butt pipes.

[0018] In some embodiments, the opening at one end of the butt pipe that is docked with the pipe joint body has a second chamfered portion.

[0019] Advantages of the present utility model:

[0020] For a pipe joint provided by the present utility model, the outer wall surfaces at both ends of the pipe joint body have annular positioning grooves, a seal is fixed on the pipe joint body, and the seal is located in the annular positioning groove. The outer periphery of the seal protrudes relative to the annular positioning groove to form seal lips. When the pipe joint body is inserted into the corresponding butt pipe, the seal lips are squeezed and deformed, thereby blocking the gap between the pipe joint body and the butt pipe. Since the seal is directly fixed on the pipe joint body, the seal will not be displaced, rolled or scratched during installation, and has high reliability. Moreover, the process of installing the seal is reduced, ensuring the assembly efficiency of the butt joint. The angle between the first inclined surface of the seal lip and the axis of the pipe joint body is greater than the angle between the second inclined surface and the axis of the pipe joint body. After installation, a pressure difference is generated by using the angle difference on both sides of the seal lip, which can ensure the sealing effect. The seal is fixed in the annular positioning groove, and the annular positioning groove has the functions of limiting and ensuring the compression ratio, which is more reliable than vulcanizing on the surface of the pipe joint body and has a lower cost.

[0021] A plug-in pipe structure provided by the utility model includes two butt pipes and a pipe joint as above, which can ensure reliable sealing effect and is convenient for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for description in the embodiments of the present utility model. Obviously, the following described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present utility model and these drawings.

[0023] Figure 1 is a cross-sectional view of the butt joint between a pipe joint and a butt pipe of the present utility model;

[0024] Figure 2 is Figure 1 a partial enlarged view of part A in

[0025] Figure 3 is a cross-sectional view of the butt joint between another pipe joint and a butt pipe of the present utility model;

[0026] Figure 4 is Figure 3 a partial enlarged view of part B in

[0027] In the figure:

[0028] 1. Pipe joint body; 11. First shoulder; 12. Second shoulder; 13. First chamfered part; 2. Sealing member; 21. Sealing lip; 22. First inclined surface; 23. Second inclined surface; 3. Butt pipe; 31. Second chamfered part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] Before explaining any embodiment of the present application in detail, it should be understood that the present application is not limited to the structural details and component arrangements described in the following description or shown in the above drawings.

[0030] In the present application, the terms "comprising", "including", "having" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device including a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "including one..." does not exclude the presence of additional identical elements in the process, method, article or device including that element.

[0031] In this application, the terms "connected", "combined", "coupled", and "installed" can be direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. Among them, for example, direct connection means that two parts or components are connected together without an intermediate member, and indirect connection means that two parts or components are respectively connected to at least one intermediate member, and these two parts or components are connected through the intermediate member. In addition, "connection" and "coupling" are not limited to physical or mechanical connection or coupling, and can include electrical connection or coupling.

[0032] In this application, those of ordinary skill in the art will understand that the functions performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the functions performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0033] In this application, the orientation terms such as "upper", "lower", "left", "right", "front", and "back" are described based on the orientation and positional relationship shown in the drawings, and should not be construed as a limitation on the embodiments of this application. In addition, in the context, it should also be understood that when it is mentioned that one element is connected "above" or "below" another element, it can not only be directly connected "above" or "below" another element, but also be indirectly connected "above" or "below" another element through an intermediate element. It should also be understood that the orientation terms such as the upper side, lower side, left side, right side, front side, and back side not only represent the positive orientation, but can also be understood as the side orientation. For example, the lower side can include directly below, lower left, lower right, lower front, and lower back, etc.

[0034] During the docking process of pipelines, in order to ensure reliable sealing effect after docking and facilitate use, as Figures 1 - 4 shown, the present utility model provides a pipe joint. The pipe joint includes a pipe joint body 1 and a seal 2.

[0035] Among them, annular positioning grooves are provided on the outer wall surfaces at both ends of the pipe joint body 1. The seal 2 is fixed on the pipe joint body 1 and is located in the annular positioning groove. The outer periphery of the seal 2 protrudes relative to the annular positioning groove to form a sealing lip 21. The sealing lip 21 has a connected first inclined surface 22 and a second inclined surface 23. The first inclined surface 22 faces the end of the pipe joint body 1, and the second inclined surface 23 faces away from the end of the pipe joint body 1. The angle between the first inclined surface 22 and the axis of the pipe joint body 1 is greater than the angle between the second inclined surface 23 and the axis of the pipe joint body 1.

[0036] Since the seal 2 is directly fixed to the fitting body 1, the seal 2 will not shift, roll or be scratched during installation, with high reliability. Moreover, the process of installing the seal 2 is reduced, ensuring the assembly efficiency of the butt joint. The angle between the first inclined surface 22 of the sealing lip 21 and the axis of the fitting body 1 is greater than the angle between the second inclined surface 23 and the axis of the fitting body 1. After installation, a pressure difference is generated by the fluid at the first inclined surface 22 and the second inclined surface 23, and the pressure at the first inclined surface 22 is greater than the pressure at the second inclined surface 23. By utilizing the pressure difference generated by the included angle difference on both sides of the sealing lip 21, the sealing lip 21 is further deformed to seal, ensuring the sealing effect. The seal 2 is fixed in the annular positioning groove, and the annular positioning groove has the functions of limiting and ensuring the compression ratio, which is more reliable than vulcanizing on the surface of the fitting body 1 and has a lower cost.

[0037] In some embodiments, the seal 2 is vulcanized and formed at the annular positioning groove of the fitting body 1, which can ensure the stable connection between the seal 2 and the fitting body 1. Moreover, during the assembly process, the assembly process can be saved, ensuring the assembly efficiency of the butt joint. In other embodiments, the seal 2 can also be bonded to the annular positioning groove of the fitting body 1 by means of bonding, which can also prevent the seal 2 from shifting, rolling or being scratched relative to the fitting body 1, improving the reliability, and reducing the process of installing the seal 2, ensuring the assembly efficiency of the butt joint.

[0038] In some embodiments, the seal 2 can be made of rubber. After the fitting body 1 is butt-jointed and installed, the seal 2 is extruded and elastically deformed to play a sealing role. Moreover, rubber has good mechanical properties and anti-aging properties, which can effectively ensure the sealing effect after butt joint. In other embodiments, the seal 2 can also be made of silica gel, which can also achieve the sealing effect.

[0039] In some embodiments, the seal 2 is fixed to both the side wall surface and the bottom surface of the annular positioning groove. Through the above settings, the stable combination of the seal 2 and the annular positioning groove can be ensured, thereby eliminating the relative movement between the seal 2 and the annular positioning groove. During the process of docking with the docking pipe 3, the situation of the seal 2 tumbling and twisting will not occur, and the sealing effect after docking and installation can be ensured.

[0040] In some embodiments, the end of the pipe joint body 1 has a first shoulder 11 and a second shoulder 12 that are relatively spaced apart. The first shoulder 11, the second shoulder 12 and the outer peripheral surface of the pipe joint body 1 define an annular positioning groove. By forming the annular positioning groove in the above manner, the seal 2 is vulcanized and formed in the annular positioning groove. The annular positioning groove plays a role in limiting the seal 2 and can also support the seal 2, reducing the radial force on the seal 2 during the docking process. Since the seal 2 needs to fill the annular positioning groove, the seal 2 has a sufficient thickness, thus ensuring the elastic compression performance of the seal 2.

[0041] In some embodiments, the distance between the first shoulder 11 and the nearest end of the pipe joint body 1 is less than the distance between the second shoulder 12 and the nearest end of the pipe joint body 1, and the outer diameter of the first shoulder 11 is less than the outer diameter of the second shoulder 12. Since the outer diameter of the first shoulder 11 is smaller, it is convenient to quickly dock with the docking pipe 3. Thus, the pipe joint body 1 can be quickly inserted into the docking pipe 3. The outer diameter of the second shoulder 12 is larger, thereby reducing the gap between the second shoulder 12 and the docking pipe 3 and playing a supporting role in the radial direction to prevent the pipe joint body 1 from skewing relative to the docking pipe 3.

[0042] In some embodiments, the first shoulder 11, the second shoulder 12 and the pipe joint body 1 are of an integral structure. Specifically, a casting process can be used for integral casting and molding, without the need to machine the annular positioning groove, reducing the manufacturing difficulty of the pipe joint body 1.

[0043] In some embodiments, both the first inclined surface 22 and the second inclined surface 23 are arc-shaped surfaces. By using arc-shaped surfaces, it is possible to avoid excessive structural stress generated after the seal 2 is extruded and deformed, ensuring the service life of the seal 2.

[0044] In some embodiments, a plurality of sealing lips 21 protrude from the outer periphery of the seal 2 relative to the annular positioning groove. By forming a plurality of sealing lips 21, the sealing reliability can be further enhanced.

[0045] In some embodiments, for some special cases, the seal 2 can also be sleeved on the pipe joint body 1, and the seal 2 is located in the annular positioning groove. Since the angle between the first inclined surface 22 of the sealing lip 21 and the axis of the pipe joint body 1 is greater than the angle between the second inclined surface 23 and the axis of the pipe joint body 1, after installation, a pressure difference is generated by the fluid at the first inclined surface 22 and the second inclined surface 23. The pressure at the first inclined surface 22 is greater than the pressure at the second inclined surface 23. By using the pressure difference generated by the angle difference on both sides of the sealing lip 21, the sealing lip 21 is further deformed and sealed, ensuring the sealing effect.

[0046] By bonding the seal 2 made of rubber in the annular positioning groove of the pipe joint body 1 by vulcanization molding method, replacing the installation of the O-ring rubber seal, and using the sealing lip 21 to achieve sealing; realizing quick installation and reducing the installation process. Moreover, the fixed surface is reliably sealed, reducing the leakage points. The annular positioning groove is used to limit the seal 2 to ensure the compression ratio of the seal 2 and avoid displacement or excessive deformation of the seal 2, thus ensuring the sealing performance.

[0047] In some embodiments, the end of the pipe joint body 1 has a first chamfered portion 13. In this embodiment, the first chamfered portion 13 is a round chamfer. By providing the first chamfered portion 13, it is convenient for the pipe joint body 1 to be docked with the butt joint pipe 3. In other embodiments, the first chamfered portion 13 at the end of the pipe joint body 1 can also adopt a straight chamfer, and the first chamfered portion 13 can be 45°. Adopting the form of a straight chamfer also makes the end of the pipe joint body 1 in a frustum shape, which is convenient for the pipe joint body 1 to be docked with the butt joint pipe 3.

[0048] This embodiment also provides an inserted pipe structure, including two butt joint pipes 3 and the pipe joint as above, and the pipe joint body 1 of the pipe joint is inserted into the butt joint pipe 3. By the cooperation of the pipe joint body 1 and the butt joint pipe 3, while ensuring the sealing effect, it is convenient to quickly complete the docking work.

[0049] In some embodiments, the opening at one end of the butt joint pipe 3 that is docked with the pipe joint body 1 has a second chamfered portion 31. Specifically, in this embodiment, the second chamfered portion 31 is a straight chamfer. By providing the second chamfered portion 31, it is convenient for the butt joint pipe 3 to be quickly docked with the pipe joint body 1. In other embodiments, the second chamfered portion 31 can also adopt a round chamfer, which can also ensure that the butt joint pipe 3 is quickly docked with the pipe joint body 1. Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A pipe joint, characterized in that: include: A pipe joint body (1), having annular positioning grooves on the outer wall surfaces at both ends of the pipe joint body (1); A sealing member (2), the sealing member (2) being fixed on the pipe joint body (1) and being located in the annular positioning groove, the outer periphery of the sealing member (2) protruding relative to the annular positioning groove to form a sealing lip (21), the sealing lip (21) having a first inclined surface (22) and a second inclined surface (23) connected to each other, the first inclined surface (22) facing the end of the pipe joint body (1), the second inclined surface (23) facing away from the end of the pipe joint body (1), and the angle between the first inclined surface (22) and the axis of the pipe joint body (1) being greater than the angle between the second inclined surface (23) and the axis of the pipe joint body (1).

2. The pipe joint according to claim 1, characterized in that: The sealing member (2) is fixed to the side wall surface and the bottom surface of the annular positioning groove.

3. The pipe joint according to claim 1, characterized in that: The end of the pipe joint body (1) has a first axial shoulder (11) and a second axial shoulder (12) which are arranged relatively spaced apart, and the first axial shoulder (11), the second axial shoulder (12) and the outer peripheral surface of the pipe joint body (1) are arranged to form the annular positioning groove.

4. The pipe joint according to claim 3, characterized in that: The distance between the first axial shoulder (11) and the nearest end of the pipe joint body (1) is smaller than the distance between the second axial shoulder (12) and the nearest end of the pipe joint body (1), and the outer diameter of the first axial shoulder (11) is smaller than the outer diameter of the second axial shoulder (12).

5. The pipe joint according to claim 3, characterized in that: The first shaft shoulder (11), the second shaft shoulder (12) and the pipe joint body (1) are an integrated structure.

6. The pipe joint according to any one of claims 1 to 5, characterized in that: The first inclined surface (22) and the second inclined surface (23) are both arc-shaped surfaces.

7. The pipe joint according to any one of claims 1 to 5, characterized in that: The outer periphery of the sealing element (2) protrudes relative to the annular positioning groove to form a plurality of sealing lips (21).

8. The pipe joint according to any one of claims 1 to 5, characterized in that: The end of the pipe joint body (1) has a first chamfered portion (13).

9. The plug-in tube structure is characterized in that: It comprises two butt-jointed pipes (3) and a pipe joint according to any one of claims 1 to 8, wherein a pipe joint body (1) of the pipe joint is inserted into the butt-jointed pipes (3).

10. The plug-in tube structure according to claim 9, characterized in that: The opening of one end of the butt-jointed tube (3) butted against the pipe joint body (1) has a second chamfered portion (31).

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