Clamping sleeve type connecting structure

Abstract

The utility model provides a clamping sleeve type connecting structure which comprises a nut, a clamping spring and a connecting pipe, an inner ring and an outer ring are arranged at one axial end of the connecting pipe, the axial length of the outer ring is smaller than that of the inner ring, and an inserting groove for a pipe to be inserted in is formed between the inner ring and the outer ring; the nut is connected with the outer ring in a threaded fit mode, a first inclined face is arranged on the inner wall of the outer ring, a second inclined face opposite to the first inclined face is arranged on the inner wall of the nut, and the end faces of the two axial ends of the clamping spring make contact with the first inclined face and the second inclined face respectively. During butt joint, the two axial ends of the clamping spring are jacked and pressed by the first inclined face and the second inclined face, so that the clamping spring mainly generates radial contraction force to tightly hold a pipe, the stress mode effectively prevents axial thrust from being generated on the surface of the pipe, and therefore the risk that an oxygen barrier layer is damaged is greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline connection technical field, especially a kind of snap-on connection structure. BACKGROUND

[0002] At present, as a commonly used pipe connecting component, snap-on pipe fitting is widely used in various pipeline systems, and its working principle is mainly that elastic element is shrunk on the surface of pipe material and forms indentation, so as to realize the connection and fixation of pipe material.

[0003] However, when it is necessary to use snap-on pipe fitting to connect pipe material with oxygen barrier layer, in addition to the radial shrinkage force generated by the pushing of screw cap to hold the pipe material, the elastic element will inevitably generate certain axial thrust, and the existence of the axial thrust is easy to squeeze the oxygen barrier layer on the surface of pipe material, resulting in the invalidation of pipe material oxygen barrier layer, and in severe cases, the whole layer is off, so as to cause the phenomenon of pipe material off and burst. SUMMARY

[0004] Based on this, the purpose of the utility model is to provide a kind of snap-on connection structure, to solve the technical problems mentioned in the above background art.

[0005] The utility model provides a kind of snap-on connection structure, including screw cap, snap spring and connecting pipe, the axial one end of the connecting pipe is provided with inner ring and outer ring, the axial length of the outer ring is less than the axial length of the inner ring, the inner ring and the outer ring are formed with the insertion slot for pipe material insertion between them;

[0006] The screw cap is threadedly connected with the outer ring, the inner wall of the outer ring is provided with first inclined surface, the inner wall of the screw cap is provided with second inclined surface opposite to the first inclined surface, and the end faces of the axial both ends of the snap spring are in contact with the first inclined surface and the second inclined surface respectively.

[0007] Further, the snap-on connection structure, wherein the screw cap includes sleeve portion, and end head portion arranged at one end of the sleeve portion, the inner wall of the sleeve portion is provided with internal thread, the inner wall of the end head portion is provided with the second inclined surface, and the outer wall of the outer ring is provided with external thread matched with the internal thread.

[0008] Further, the snap-on connection structure, wherein the outer wall of the inner ring is spaced apart and arranged with a plurality of annular ribs along the axial direction.

[0009] Further, the snap-on connection structure, wherein the outer wall of the inner ring is provided with groove, and sealing ring embedded in the groove.

[0010] Further, the clamping sleeve type connecting structure, wherein a plurality of first slits are arranged along the profile on one axial side of the clamping spring, and a plurality of second slits are arranged along the profile on the other axial side of the clamping spring, the first slits being arranged in a staggered manner with the second slits.

[0011] Further, the clamping sleeve type connecting structure, wherein the inner wall of the clamping spring is smooth.

[0012] Further, the clamping sleeve type connecting structure, wherein the third slope is formed on the surface of the clamping spring in contact with the first slope and the second slope respectively.

[0013] Further, the clamping sleeve type connecting structure, wherein an external thread is arranged on the end of the connecting pipe away from the nut.

[0014] Further, the clamping sleeve type connecting structure, wherein the volume of the pipe cavity defined by the connecting pipe is greater than the volume of the pipe cavity defined by the inner ring.

[0015] Compared with the prior art, the clamping sleeve type connecting structure has the following beneficial effects:

[0016] When the connecting pipe is connected to the pipe, the axial ends of the clamping spring are pressed by the first slope and the second slope, so that the clamping spring mainly generates a radial contraction force to tightly hold the pipe. This force mode effectively avoids generating an axial thrust on the surface of the pipe, thereby greatly reducing the risk of damage to the oxygen barrier layer, ensuring the normal operation of the pipeline system, and reducing a series of problems caused by the failure of the oxygen barrier layer. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a sectional view of the clamping sleeve type connecting structure in the utility model;

[0018] Figure 2 is a structural schematic view of the clamping spring in the utility model;

[0019] MAIN ELEMENT SYMBOL EXPLANATION

[0020] 10, nut; 11, sleeve portion; 12, end portion; 20, clamping spring; 21, first slit; 22, second slit; 23, third slope; 30, connecting pipe; 31, inner ring; 32, outer ring; 41, first slope; 42, second slope; 50, annular rib; 60, sealing ring; 70, external thread.

[0021] The following specific embodiments will further illustrate the utility model in combination with the above drawings. DETAILED DESCRIPTION

[0022] For the convenience of understanding the utility model, the utility model will be described more fully below with reference to the relevant drawings. The drawings show several embodiments of the utility model. However, the utility model can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0023] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0025] Please refer to Figure 1 And Figure 2 The utility model discloses a clamping sleeve type connecting structure, including the nut 10, the clamping spring 20 and the connecting pipe 30, the axial one end of connecting pipe 30 is provided with inner ring 31 and outer ring 32, the axial length of outer ring 32 is less than the axial length of inner ring 31, and the inner ring 31 is formed with the insertion slot for pipe material between the outer ring 32.

[0026] The nut 10 is threadedly connected with the outer ring 32, the inner wall of the outer ring 32 is provided with the first inclined surface 41, the inner wall of the nut 10 is provided with the second inclined surface 42 opposite to the first inclined surface 41, and the end faces of the axial both ends of the clamping spring 20 are in contact with the first inclined surface 41 and the second inclined surface 42 respectively.

[0027] When butting, the axial both ends of the clamping spring 20 are extruded by the first inclined surface 41 and the second inclined surface 42, so that the clamping spring 20 generates radial contraction force to tightly hold the pipe material, and this stress mode effectively avoids generating axial thrust on the surface of the pipe material, thereby greatly reducing the risk of damage to the oxygen barrier layer, ensuring the normal operation of the pipeline system and reducing a series of problems caused by the failure of the oxygen barrier layer.

[0028] Please refer to Figure 1The screw cap 10 comprises a sleeve portion 11 and an end portion 12 arranged at one end of the sleeve portion 11. The inner wall of the sleeve portion 11 is provided with internal threads, and the inner wall of the end portion 12 is provided with the second inclined surface 42. The outer wall of the outer ring 32 is provided with external threads matched with the internal threads. It can be understood that the sleeve portion 11 and the outer ring 32 are connected through the matching of the internal threads and the external threads. As the screw cap 10 is continuously tightened, the first inclined surface 41 and the second inclined surface 42 gradually approach each other, thereby extruding the two ends of the clamping spring 20, so that the clamping spring 20 is radially contracted to tightly hold the pipe.

[0029] Further, the outer wall of the inner ring 31 is spaced apart in the axial direction and provided with a plurality of annular ribs 50. The annular ribs 50 are used to tightly fit the inner wall of the pipe, increase the friction force of the two fittings, effectively prevent the pipe from moving at the connection part, significantly improve the fixing stability of the pipe at the connection part, and ensure the reliability of the entire pipeline system.

[0030] Further, the outer wall of the inner ring 31 is provided with a groove, and a sealing ring 60 is embedded in the groove. The sealing ring 60 is used to fill the small gap that may exist between the pipe and the inner ring 31, prevent fluid from leaking through the gap, and ensure the sealing of the pipeline system.

[0031] Specifically, referring to Figure 2 In this embodiment, the clamping spring 20 has a ring structure. The first slits 21 are arranged on one side of the clamping spring 20 along the contour, and the second slits 22 are arranged on the other side of the clamping spring 20 along the contour. The first slits 21 and the second slits 22 are arranged in a staggered manner. The first slits 21 and the second slits 22 provide space for the radial contraction of the clamping spring 20. In addition, when the clamping spring 20 tightly holds the pipe, the first slits 21 and the second slits 22 can also form indentations on the surface of the pipe, making the connection between the pipe and the clamping spring 20 more stable, and effectively resisting the influence of external forces such as axial tension, radial pressure and vibration that may occur during the operation of the pipeline system.

[0032] Further, the inner wall of the clamping spring 20 is smooth. This can effectively reduce the scratching or wear of the oxygen barrier layer on the surface of the pipe, achieve tight connection, and maximize the protection of the surface of the pipe to maintain the original performance of the pipe.

[0033] Further, the surfaces of the clamping spring 20 in contact with the first inclined surface 41 and the second inclined surface 42 at the two ends in the axial direction are third inclined surfaces 23. This inclined surface and inclined surface contact mode can make the force transmission more uniform, and can more effectively convert the axial force applied by the screw cap 10 into the radial contraction force of the clamping spring 20, so that the clamping spring 20 can smoothly contract and tightly hold the pipe.

[0034] With reference to Figure 1 The connecting pipe 30 is provided with an external thread 70 at one end away from the nut 10, which is used to connect another pipe.

[0035] With reference to Figure 1 The connecting pipe 30 defines a larger pipe cavity volume than the inner ring 31, so that the fluid can flow more smoothly through the connecting pipe 30.

[0036] In summary, in the above-mentioned embodiments of the utility model, when the pipes are connected, the axial ends of the circlip 20 are pressed by the first inclined surface 41 and the second inclined surface 42, so that the circlip 20 mainly generates a radial contraction force to tightly hold the pipe. This force mode effectively avoids generating an axial thrust on the surface of the pipe, thereby greatly reducing the risk of damage to the oxygen barrier layer, ensuring the normal operation of the pipeline system, and reducing a series of problems caused by the failure of the oxygen barrier layer.

[0037] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0038] The above-described embodiments only express several implementation manners of the utility model, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the utility model patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which are all within the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A snap-on connection structure comprising a nut, a snap ring, and a connection pipe, characterized in that, An inner ring and an outer ring are arranged at an axial end of the connecting pipe, the axial length of the outer ring is less than that of the inner ring, and a slot for inserting a pipe is formed between the inner ring and the outer ring. The nut is threadedly connected to the outer ring, the inner wall of the outer ring is provided with a first inclined surface, the inner wall of the nut is provided with a second inclined surface opposite to the first inclined surface, and the end faces of the two axial ends of the snap spring are respectively in contact with the first inclined surface and the second inclined surface.

2. The card-in-slot connection structure according to claim 1, wherein The nut comprises a sleeve portion and a head portion arranged at one end of the sleeve portion, the inner wall of the sleeve portion is provided with an internal thread, and the inner wall of the head portion is provided with the second inclined surface, and the outer wall of the outer ring is provided with an external thread matched with the internal thread.

3. The card-in-slot connection structure according to claim 1, wherein The outer wall of the inner ring is provided with a plurality of annular ribs arranged along the axial direction.

4. The card-in-slot connection structure according to claim 1, wherein The outer wall of the inner ring is provided with a groove, and a sealing ring is embedded in the groove.

5. The card-in-slot connection structure according to claim 1, wherein A plurality of first slits are arranged along the profile at one axial side of the snap spring, a plurality of second slits are arranged along the profile at the other axial side of the snap spring, and the first slits and the second slits are arranged in a staggered manner.

6. The card-in-slot connection structure according to claim 1, wherein The inner wall of the snap spring is smooth.

7. The card-in-slot connection structure according to claim 1, wherein The third inclined surface is arranged at the end face of the axial end of the snap spring.

8. The card-in-slot connection structure according to claim 1, wherein The connecting pipe is provided with an external thread at the end away from the nut.

9. The card-in-slot connection structure according to claim 1, wherein The volume of the pipe cavity defined by the connecting pipe is greater than that defined by the inner ring.

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