Claw type sleeve and pipe fitting connection device having the same

Abstract

The application discloses a claw type sleeve and a pipe connecting device with the claw type sleeve. The claw type sleeve comprises a sleeve body and a claw which is popped out outside the sleeve body. The inside of the sleeve body is provided with a center hole for the pipe to extend into the connection. One end of the claw is connected with the sleeve body. The free end of the claw which is not connected with the sleeve body is hooked and locked the pipe in the center hole after being pressed. Compared with the prior art, the claw type sleeve and the pipe connecting device with the claw type sleeve can realize the pipe assembly type quick connection and improve the connection strength between the sleeve and the pipe without tapping the pipe end during the on-site construction of the pipe connection. The sleeve and the pipe have the advantages of stable connection, prevention of pipe falling caused by high pressure liquid or gas in the pipe.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of pipe connection, in particular to a claw type sleeve and a pipe connection device with the claw type sleeve. BACKGROUND

[0002] The sleeve type pipe joint is a kind of medium and high pressure pipeline connecting mode with simple structure and easy installation and disassembly, which is widely used in chemical industry, machinery, electronics, electric power, aerospace, military industry, medicine, light industry and scientific research industry, and the working pressure can be as high as 63 MPa.

[0003] Although the sleeve type pipe joint has various types, its basic structure is composed of three main parts: a joint body, an annular sleeve and a compression nut. When the annular sleeve and the nut sleeve are inserted into the joint body on the pipe, the outer taper surface of the front end of the sleeve is attached to the inner taper surface of the joint body, and the inner blade of the sleeve is uniformly combined with the pipe to form an effective seal. The disadvantages are: (1) no temperature difference compensation function, the sealing performance is greatly reduced in the environment with large temperature change; (2) since the connection performance relies on the extrusion of the taper sleeve, the connection strength is low, and the anti-impact and vibration performance is poor.

[0004] In order to overcome the defects of the above-mentioned single sleeve type pipe joint, the skilled in the art has developed a double sleeve type pipe joint. In addition to the joint body, the front sleeve and the compression nut included in the above-mentioned single sleeve type joint, a rear sleeve is arranged between the front sleeve and the nut, wherein the front sleeve is made of a material that can adapt to temperature change, and the rear sleeve is made of a material with high strength, thereby solving the problem of sealing performance decline caused by temperature change in single sleeve type pipe joint to some extent. The disadvantages are: (1) compared with the single sleeve pipe joint, two kinds of materials are needed to make the front sleeve and the rear sleeve, which not only has high cost, but also has relatively complex installation and disassembly; (2) the connection performance still relies on the extrusion of the taper surface of the front sleeve, and the connection strength is still low, the anti-impact and vibration performance is poor, and the sealing performance will also be poor with the change of load and environmental temperature. SUMMARY

[0005] In view of the above problems existing in the prior art, the present application provides a claw type sleeve which can strengthen the connection strength between the sleeve and the pipe and improve the stability of the pipe connection.

[0006] To solve the above problems, the scheme provided by the present application is:

[0007] In a first aspect, there is a snap-on type ferrule, which includes a ferrule body and snap-on claws that pop out from the outside of the ferrule body. The inner side of the ferrule body has a central hole for a pipe fitting to be inserted and connected. One end of the snap-on claw is connected to the ferrule body. The free end of the snap-on claw, which is not connected to the ferrule body, hooks and locks the pipe fitting in the central hole inward when pressed.

[0008] In a preferred embodiment of the present invention, the sleeve body includes, in sequence along the axial direction, a sleeve cutting edge, a sleeve middle section and a sleeve tail, the buckle is provided in the sleeve middle section, the sleeve middle section has a buckle storage groove, and the storage groove radially penetrates the sleeve body.

[0009] In a preferred embodiment of the present invention, the buckle is an arc-shaped sheet, and one end of the buckle is elastically connected to the end of the storage groove near the tail of the card sleeve.

[0010] In a preferred embodiment of the present invention, the outer arc surface of the latch is inclined from the connecting end to the free end in a direction that gradually moves away from the sleeve body.

[0011] In a preferred embodiment of the present invention, the latch is integrally formed with the sleeve body and is made of elastic sheet material.

[0012] In a preferred embodiment of the present invention, the tail of the card sleeve and / or the cutting edge of the card sleeve are folded outward or rolled up.

[0013] In a preferred embodiment of the present invention, the card sleeve body is provided with a plurality of buckles evenly distributed around its circumference, and the central axis of the plurality of buckles coincides with the central axis of the card sleeve body.

[0014] In a preferred embodiment of the present invention, the ferrule body has an axially formed stress-relieving groove, which is open at one end and closed at the other end.

[0015] In a preferred embodiment of the present invention, the sleeve body is provided with multiple stress-relieving grooves evenly distributed around its circumference, and the opening ends of the multiple stress-relieving grooves are all located on the same end face of the sleeve body.

[0016] In a preferred embodiment of the present invention, the sleeve body is provided with multiple stress-relieving grooves evenly distributed around its circumference, and the opening ends of the multiple stress-relieving grooves are alternately located on the two end faces of the sleeve body.

[0017] In a preferred embodiment of the present invention, the sleeve body is provided with multiple stress-relieving grooves evenly distributed around its circumference, and the closed ends of some of the stress-relieving grooves extend to the latch claws.

[0018] In a preferred embodiment of the present invention, the sleeve body is provided with a cut-off slit with openings at both ends in the axial direction.

[0019] In a preferred embodiment of the present invention, the sleeve body is provided with a positioning body that protrudes into the central hole and is located on the same circumferential surface as the free end of the buckle claw.

[0020] In a preferred embodiment of the present invention, the positioning body is strip-shaped or dot-shaped.

[0021] In a preferred embodiment of the present invention, arc-shaped strips are provided on both sides of the buckle in the width direction within the buckle receiving groove.

[0022] Secondly, a pipe fitting connection device having a claw-type ferrule as described above includes a connector body with a threaded connection section, a locking nut that mates with the threaded connection section, and the claw-type ferrule. A central hole is provided on the inner side of the connector body for the pipe fitting to extend into and connect. The inner diameter of the threaded connection section is formed with a tapered groove for accommodating the claw-type ferrule. When the locking nut engages to lock the threaded connection section, the tapered groove gradually presses the free end of the claw of the claw-type ferrule inward until it locks the internal pipe fitting.

[0023] In a preferred embodiment of the present invention, an annular groove is provided on the pipe fitting for the free end of the latch to be pressed in.

[0024] In a preferred embodiment of the present invention, the claw-type ferrule includes, in sequence along the axial direction, a ferrule cutting edge, a ferrule middle section, and a ferrule tail, with the claw located in the ferrule middle section.

[0025] In a preferred embodiment of the present invention, the locking nut includes a threaded section that mates with the threaded connection section and a straight section that mates with the pipe fitting. The straight section has an annular groove formed on its inner diameter for the cutting edge of the ferrule to extend into.

[0026] In a preferred embodiment of the present invention, a sealing ring is provided in the annular groove corresponding to the end of the ferrule cutting edge.

[0027] In a preferred embodiment of the present invention, the tapered groove includes a tapered section with a larger slope corresponding to the middle section of the sleeve and a gentler section with a smaller slope corresponding to the tail of the sleeve, wherein the tapered section is located between the gentler section and one end face of the connector body.

[0028] In a preferred embodiment of the present invention, a sealing ring is provided at the end of the smooth section corresponding to the tail of the ferrule.

[0029] In a preferred embodiment of the present invention, the inner wall of the connector body has a radially protruding radial step that supports and abuts against the outer wall of the pipe.

[0030] Compared with the prior art, the preferred embodiment of the present invention has the advantages of a snap-claw type ferrule and a pipe fitting connection device having the snap-claw type ferrule, which eliminates the need for tapping the ends of the pipe fittings during on-site construction of pipe fitting connections. It can achieve quick assembly connection of pipe fittings, improve the connection strength between the ferrule and the pipe fitting, maintain the connection stability between the ferrule and the pipe fitting, and prevent the pipe fitting from falling off when subjected to high pressure liquid or gas. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the components of a pipe fitting connection device with a snap-claw type sleeve according to an embodiment of the present invention.

[0033] Figure 2 This is a schematic diagram of the components of a pipe fitting connection device with a snap-clip type sleeve according to another embodiment of the present invention.

[0034] Figure 3 This is a three-dimensional schematic diagram of the basic model 1 (with a cut-off version) of the snap-on card holder according to an embodiment of the present invention.

[0035] Figure 4 This is a plan view of the basic model 2 (uncut version) of the snap-on card holder according to an embodiment of the present invention.

[0036] Figure 5 yes Figure 4 Cross-sectional view at point AA.

[0037] Figure 6 This is an assembly diagram of the basic model 2 and the pipe fittings.

[0038] Figure 7 The diagram above shows a three-dimensional view of variant 1 (single-sided stress-relieving groove) of the snap-claw type sleeve with a concave positioning groove and a half-section view of its assembly with the pipe fitting.

[0039] Figure 8 The image shows a three-dimensional schematic diagram (top) of the modified version 2 (double-sided stress-relieving groove version) of the snap-claw type sleeve with concave positioning points and a half-sectional schematic diagram (bottom) of its assembly with the pipe fitting.

[0040] Figure 9 This is a three-dimensional schematic diagram of variant 3 of the snap-claw type ferrule with stress-relieving grooves at the snap-claw.

[0041] Figure 10This is a three-dimensional schematic diagram of variant 4 of the snap-claw type ferrule with stress-relieving grooves at the snap-claw.

[0042] Figure 11 This is a 3D illustration of variant 5 of the clip-on card holder with double folded edges.

[0043] Figure 12 This is a cross-sectional view of variant 5.

[0044] Figure 13 This is an assembly demonstration diagram of variant 5 with pipe fittings, connector body, lock nut, and single sealing ring.

[0045] Figure 14 This is a half-section diagram showing the completed assembly of variant 5 with pipe fittings, connector body, lock nut, and single sealing ring.

[0046] Figure 15 This is a half-section diagram showing the completed assembly of variant 5 with pipe fittings, connector body, lock nut, and double sealing ring.

[0047] Figure 16 This is a 3D illustration of variant 6 of the snap-on card holder with a single folded edge (folded edge at the tail of the card holder).

[0048] Figure 17 This is a half-section diagram showing the completed assembly of variant 6 with pipe fittings, connector body, lock nut, and single sealing ring.

[0049] Figure 18 This is a three-dimensional schematic diagram of variant 7 of the snap-claw type card holder with a single folded edge (card holder blade edge folded edge).

[0050] Figure 19 This is a three-dimensional schematic diagram of variant 8 of the snap-on card holder with arc-shaped snap claws.

[0051] The correspondence between the markings in the diagram is as follows:

[0052] 1-Claw-type ferrule; 10-Frrule body; 11-Frrule cutting edge; 12-Frrule middle section; 13-Frrule tail; 14-Claw storage groove; 2-Claw; 21-Arc-shaped strip; 22-Stress groove; 3-Pipe fitting; 31-Annular groove; 4-Connector body; 41-Threaded connection section; 42-Gradual groove; 421-Smooth section; 43-Radial step; 5-Locking nut; 51-Threaded section; 52-Straight section; 53-Annular groove; 6-Sealing ring; 71-Concave positioning groove; 72-Concave positioning point; 81-Stress relief groove; 82-Cut-off seam; 9-Folded edge or rolled edge. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] Please see Figure 1 This is a component diagram of a pipe fitting connection device provided in an embodiment of the present invention. Its main components include: a connector body 4, a locking nut 5, and a claw-type clamping sleeve 1. Figure 1 The connector body 4 is a straight connector with threaded connection sections 41 symmetrically provided on the outer surfaces of both ends, which can be connected with two locking nuts 5. The inner side of the straight connector has a central hole for the pipe fitting 3 to be inserted for connection. The pipe fitting 3 can be a steel pipe, stainless steel pipe, aluminum pipe, alloy steel pipe or other material pipe body. An annular groove 31 is provided on the outer surface of the end of the pipe fitting 3 near the connector body 4 along the circumferential direction.

[0055] The snap-on card holders come in various styles, not limited to the one or more styles shown in the attached diagram. Figure 3 For example, the basic model 1 of the snap-on type ferrule 1 has the simplest structure, including a ferrule body 10 and snap-on claws 2 that pop out from the outside of the ferrule body 10. The inner side of the ferrule body 10 has a central hole for the pipe fitting 3 to be inserted and connected. One end of the snap-on claw 2 is connected to the ferrule body 10. The free end of the snap-on claw 2 that is not connected to the ferrule body 10 is snapped inward and, after being pressed, snaps inward to lock the pipe fitting 3 in the central hole. Specifically, the free end of the snap-on claw 2 can snap into the annular groove 31 on the pipe fitting 3. When the pipe fitting is connected and assembled, the ferrule and the pipe fitting can be pre-positioned on the one hand, and the connection strength between the ferrule and the pipe fitting can be improved on the other hand, maintaining the connection stability between the ferrule and the pipe fitting, and preventing the ferrule and the pipe fitting from slipping off during use when the pipe fitting is subjected to high pressure liquid or gas.

[0056] Furthermore, the ferrule body 10 includes, along the axial direction, a ferrule cutting edge 11, a ferrule middle section 12, and a ferrule tail 13. A latch 2 is located in the ferrule middle section 12, which has a latch receiving groove 14. The receiving groove 14 radially penetrates the ferrule body 10, allowing the latch 2 to pass through. The free end of the latch 2 engages with the annular groove 31 of the fitting 3 inside the sleeve body 1. Figure 6As shown. The latch 2 is an arc-shaped sheet, with one end of the latch 2 elastically connected to the end of the storage groove 14 near the tail 12 of the sleeve. In its normal state, the outer arc surface of the latch 2 tilts away from the sleeve body 10 from its connecting end to its free end. The free end of the latch 2 is slightly bent inward into the central hole of the sleeve body 10. When the latch 2 is pressed inward, its bent free end will pass through the storage groove 14 and embed into the arc-shaped groove 31 of the internal tube 3. At this time, the end of the sleeve tail 13 is aligned with the port of the tube 3, which can securely position the precise fitting of the sleeve body 10 and the tube 3. At the same time, before the latch 2 is released from pressure, the sleeve body 10 is not prone to axial displacement with the tube 3, which can avoid axial displacement of the sleeve body 10 and the tube 3 after connection, which may cause leakage or loosening at the connection of the tube.

[0057] In practical use, the pressure applied to the locking claw 2 mainly comes from the locking nut 5, such as Figure 13 and Figure 14 As shown, the inner diameter of the threaded connection section 41 of the connector body 4 is formed with a tapered groove 42 for accommodating the snap-on type ferrule. When the locking nut 5 is tightened and the threaded connection section 41 is engaged, the tapered groove 42 can gradually press the free end of the snap-on type ferrule inward until it locks the annular groove 31 on the internal pipe fitting 3.

[0058] Furthermore, the locking nut 5 includes a threaded section 51 that mates with the threaded connection section 41 of the connector body 4, and a straight section 52 that mates with the pipe fitting. The straight section 52 has an annular groove 53 formed on its inner diameter for the insertion of the ferrule cutting edge 11. Preferably, a sealing ring 6 can be provided in the annular groove 53. The sealing ring can be positioned between the port of the ferrule cutting edge 11 and the inner wall of the annular groove 53, such as... Figure 15 As shown, and to avoid the sharp edge from cutting hands during ferrule installation, or to prevent the ferrule from tearing the sealing ring 6 or other components after installation, the end of the ferrule's cutting edge 11 can be folded outward at a 90° angle or rolled outward in an arc shape to form a folded edge or rolled edge 9, such as... Figure 18 As shown.

[0059] Furthermore, such as Figure 15 As shown, the tapered groove 42 of the inner diameter of the connector body 4 includes a tapered section with a larger slope corresponding to the middle section 12 of the ferrule and a gentler slope section 421 corresponding to the tail 13 of the ferrule. The tapered section is located between the gentler slope section 421 and one end face of the connector body 4. An annular sealing ring 6 is provided in the gentler slope section 421 corresponding to the end of the tail 13 of the ferrule. Similarly, the end of the tail 13 of the ferrule can be folded outward at 90° or rolled outward in an arc shape to form a folded edge or rolled edge 9, such as... Figure 16 and Figure 17 As shown, this is to avoid scratching hands during assembly, or damaging the sealing ring 6 or other components after assembly.

[0060] Preferred, such as Figure 11 and Figure 12 As shown, both the cutting edge 11 and the tail 13 of the ferrule are provided with outward folded or rolled edges 9, which can ensure that the two ends of the ferrule will not scratch hands, sealing rings or other parts during pipe fitting installation and assembly.

[0061] Furthermore, the inner wall of the connector body 4 has a radially protruding radial step 43 that supports and abuts against the outer wall of the pipe fitting, such as... Figure 15 As shown.

[0062] Figure 1 The pipe fitting connection device in this embodiment is equipped with a sealing ring 6, located on the side of the ferrule body 10 near the tail of the ferrule, and its assembly process is as follows: Figure 13 As shown, first, the locking nut 5, the ferrule, and the sealing ring 6 are sequentially fitted onto the end of the pipe fitting 3 with the annular groove 31. The ferrule's cutting edge has an outwardly folded or rolled edge and extends into the annular groove within the inner diameter of the locking nut 5. The free end of the locking claw is aligned with the annular groove 31 on the pipe fitting 3 and pushed in. Through the action of the stress-relieving groove 81, the inner concave positioning groove 71 or inner concave positioning point 72 of the ferrule can be elastically opened and inserted into the outer edge of the pipe fitting 3. Continue to apply force and push in until the inner concave positioning groove 71 or inner concave positioning point 72 of the ferrule is engaged in the annular groove 31 of the pipe fitting 3. In summary, the installation process does not require... Measurement allows the free end of the ferrule 2 of the ferrule body 10 to be quickly and accurately positioned directly above the annular groove 31 of the pipe fitting 3, enabling rapid and precise positioning and installation during the subsequent connection and assembly of the pipe fitting 3. Then, the pipe fitting 3, with the locking nut 5 and ferrule installed, is inserted into the connector body 4. The ferrule extends into the tapered groove within the inner diameter of the connector body 4. The threaded connection section of the connector body 4 engages with the threaded section of the locking nut and gradually tightens. The tapered groove deforms the ferrule, causing the free end of the ferrule to press into the annular groove 31 of the pipe fitting 3, achieving precise positioning and locking between the ferrule and the pipe fitting. After assembly, as shown... Figure 15 As shown, the sealing ring 6 is disposed between the tail of the ferrule body 10 and the side wall of the tapered groove of the connector body 4. The tail of the ferrule has an outwardly folded edge or a rolled edge.

[0063] In addition, when disassembling the ferrule in the above embodiment, simply rotate the locking nut 5 in the opposite direction to loosen and remove the connector body 4. The free end of the clip will naturally pop out from the annular groove of the pipe fitting, so that the ferrule can be easily removed from the pipe fitting and the disassembly can be completed. The operation is very convenient.

[0064] Figure 2 The pipe fitting connection device in this embodiment is provided with two sealing rings 6, which are located at both ends of the ferrule body 10, respectively. The assembly process is the same as... Figure 1 The embodiments are similar, except that sealing rings 6 are fitted onto the fittings at both ends of the ferrule. The assembled state can be referenced.Figure 15 The embodiment shows the case where the two ends of the card sleeve body are not rolled.

[0065] Preferably, the snap-on ferrule of the present invention can be manufactured using stainless steel, copper, high-strength polymer materials (e.g., POM, nylon, and other non-metallic materials), or by powder metallurgy forming, metal sheet die stamping, stretching, or internal die insertion forming of round tubes from the inside out. The snap-on 2 and the ferrule body 10 can be integrally formed and made of elastic sheet material.

[0066] like Figure 3 and Figure 4 As shown, the card sleeve body 10 has multiple latches 2 evenly distributed around its circumference, and the central axis of the multiple latches 2 coincides with the central axis of the card sleeve body 10. The latches 2 can be made of arc-shaped sheets of equal width. Multiple latch storage slots 14 are provided on the card sleeve body 10 corresponding to the multiple latches 2. One end of the latch 2 is elastically connected to one end of the storage slot 14 or integrally formed, and the other end of the latch 2 is a free end, which is fastened to the central hole in the card sleeve body 10. The outer arc surface of the latch 2 is inclined from the connecting end to the free end in a direction that gradually moves away from the card sleeve body.

[0067] As another variation of the snap-on type sleeve of the present invention, such as Figure 19As shown, each claw 2 on the claw body 10 has an arc-shaped strip 21 on both sides in the width direction. The ferrule body 1 can be made of a circular tube material. The claw 2 and the arc-shaped strips 21 on both sides are arc-shaped. The width of the claw receiving groove 14 is greater than the width of the claw 2 inside it. Therefore, arc-shaped strips 21 can be provided on both sides of the claw 2 inside the claw receiving groove 14. In addition, a stress groove 22 of a certain width is left between the arc-shaped strip 21 and the groove wall of the claw receiving groove 14 on the adjacent side. The two ends of the arc-shaped strip 21 are fixedly connected to the opposite ends of the claw receiving groove 14 or integrally formed. One end of the claw 2 is elastically connected to the end of the claw receiving groove 14 near the tail of the ferrule or integrally formed. The other end of the claw 2 is a free end that hooks inward and locks the tube in the center hole of the ferrule inward after being pressed. Other structures and functions on the ferrule are the same as those in the previous embodiment, and will not be described in detail here. This claw-type ferrule 1 is primarily designed for use with large-diameter pipe fittings. In such cases, the ferrule 1 needs to be proportionally thickened in its material construction. The arc-shaped strips 21 on both sides of the claw 2 and the added stress grooves 22 can improve the elastic modulus of the thickened ferrule material to a certain extent (reducing the rigidity of the free end of the claw 2 in the ferrule body 10 after thickening, thus reducing the need for increased locking force from the locking nut when the free end of the claw 2 undergoes elastic deformation). In actual use, when connecting large-diameter pipe fittings, as the locking nut tightens the free end of the claw, it deforms along the tapered groove 42 within the inner diameter of the connector body 4. The arc-shaped strips 21 and stress grooves 22 on both sides of the claw 2 reduce the rigidity of the claw 2 during deformation, making the deformation of the claw 2 more flexible and easier to perform elastic deformation during the connection and assembly of large-diameter pipe fittings. The assembly process can be referenced... Figure 13 and Figure 14 Examples of implementations.

[0068] Preferably, the ferrule body 10 has a cut-off slit 82 with openings at both ends along its axial direction. The presence of the cut-off slit 82 allows the ferrule body 10 to have a certain elastic expansion and contraction capability, making it easier to assemble the ferrule body 10 onto the pipe fitting 3. It also allows for production using die stretching or seamless round tube material stamping technology. When the ferrule body is produced using continuous stamping technology, this cut-off slit is not necessary. Figures 4-6 As shown, the card sleeve body 10 does not have a cut-off slit 82.

[0069] Preferably, the ferrule body 10 has an axially formed stress-relieving groove 81, which is open at one end and closed at the other. For example... Figure 7 As shown, the ferrule body 10 has multiple stress-relief grooves 81 evenly distributed around its circumference. The opening ends of the multiple stress-relief grooves 81 are all located on the same end face of the ferrule body 10, or, as shown... Figure 8 As shown, the opening ends of the multiple stress-relieving grooves 81 are alternately located on the two end faces of the ferrule body 10. Sometimes, as... Figure 9As shown, when part of the stress-relieving groove 81 is located at the position of the latch 2, the closed end of the stress-relieving groove 81 can also be extended to the latch 2 without penetrating the free end of the latch. In some cases, such as Figure 10 As shown, the stress-relieving groove 81 at the latch 2 can also bypass the latch 2 and be formed on the ferrule cutting edge above the latch 2. In this case, the stress-relieving groove 81 is connected to the latch receiving groove. The distribution of these stress-relieving grooves 81 can be arbitrarily designed on the ferrule body 10 according to actual needs, provided that the strength of the ferrule is met, and is not limited to the styles shown in the attached figure.

[0070] Preferably, the sleeve body 10 is provided with a plurality of positioning bodies protruding into the central hole on the same circumferential surface as the free end of the latch 2. The positioning body can be a strip-shaped concave positioning groove 71. Figure 7 ), or a dot-shaped concave positioning point 72 ( Figure 8 When using it, the free end of the clip can be pre-positioned into the annular groove of the pipe fitting, which helps the free end of the clip to accurately engage with the annular groove of the pipe fitting.

[0071] Furthermore, by setting stress-relieving grooves 81 or cut-off slots 82 on the ferrule body 10, the concave positioning grooves 71 and concave positioning points 72 of the ferrule body 10 can be elastically opened to be inserted into the outer edge of the pipe fitting 3. Without measuring the size and positioning position of the ferrule body 10 on the pipe fitting 3, the concave positioning grooves 71 or concave positioning points 72 of the ferrule body 10 can be smoothly pushed into the annular groove 34 of the pipe fitting 3, and then elastically contracted to self-position and lock into the annular groove 34. At the same time, the free end of the ferrule body 10's latch can accurately and quickly correspond to the annular groove 31 of the pipe fitting 3.

[0072] Preferably, the snap-on ferrule of the present invention and the pipe fitting connection device having the snap-on ferrule can be applied not only to straight connectors, but also to quick-connect connections in the field such as bends and tees. The ferrule mainly ensures that when the pipe fitting contains high-pressure liquid or gas, it has a strong anti-loosening pull force and convenient installation and disassembly (the ferrule thickness is about 0.5mm to 2.0mm for different pipe fitting diameters).

[0073] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0074] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pipe coupling device of the snap grip type, characterised in that: The joint body includes a threaded connecting section, a lock nut matched with the threaded connecting section, and a claw type sleeve. The inside of the joint body is provided with a central hole for the pipe to extend into the joint. The inner diameter of the threaded connecting section is formed with a tapered groove for accommodating the claw type sleeve. When the lock nut is matched with the threaded connecting section, the tapered groove gradually presses the free end of the claw type sleeve inward until the pipe inside is locked. The pipe is provided with an annular groove for the free end of the claw to press into. The claw type sleeve includes a sleeve body and a claw which is popped out of the outside of the sleeve body. The inside of the sleeve body is provided with a central hole for the pipe to extend into the joint. One end of the claw is connected with the sleeve body, and the free end of the claw is hooked to the pipe inside the central hole after being pressed. The sleeve body includes a sleeve cutting edge, a sleeve middle section, and a sleeve tail section in sequence along the axial direction. The claw is arranged in the sleeve middle section. The sleeve middle section is provided with a claw receiving groove which penetrates the sleeve body in the radial direction. The sleeve body is provided with a truncated seam which is open at both ends in the axial direction. Arc-shaped strips are arranged on both sides of the claw in the width direction of the claw receiving groove. The claw is an arc-shaped sheet body. One end of the claw is elastically connected with one end of the receiving groove which is close to the sleeve tail section.

2. The device according to claim 1, wherein The outer arc surface of the claw is inclined to the direction gradually away from the sleeve body from the connection end to the free end.

3. The device of claim 1 wherein, The claw is integrally formed with the sleeve body and is made of an elastic sheet.

4. The device of claim 1 wherein, The sleeve tail section and / or the sleeve cutting edge are outwardly folded or rolled.

5. The clamping ring of claim 1 wherein, The sleeve body is circumferentially provided with a plurality of claws. The central axes of the plurality of claws coincide with the central axis of the sleeve body.

6. The clamping ring of claim 1 wherein, The sleeve body is axially provided with a stress relief groove which is open at one end and closed at the other end.

7. The clamping coupling of claim 6 wherein, The sleeve body is circumferentially provided with a plurality of stress relief grooves. The open ends of the plurality of stress relief grooves are located on the same end face of the sleeve body.

8. The clamping coupling of claim 6 wherein, The sleeve body is circumferentially provided with a plurality of stress relief grooves. The open ends of the plurality of stress relief grooves are alternately located on the two end faces of the sleeve body.

9. The clamping coupling of claim 6 wherein, The sleeve body is circumferentially provided with a plurality of stress relief grooves. The closed ends of part of the stress relief grooves extend to the claw.

10. The clamping coliar of claim 1 wherein, The sleeve body is provided with a positioning body which is protruded into the central hole and located on the same circumferential surface as the free end of the claw.

11. The clamping coliar of claim 10 wherein, The positioning body is in the shape of a strip or a dot.

12. The clamping coliar of claim 1 wherein, The lock nut includes a threaded section matched with the threaded connecting section and a flat section matched with the pipe. The inner diameter of the flat section is formed with an annular groove for the sleeve cutting edge to extend into.

13. The clamping coupling of claim 12 wherein: A sealing ring is arranged in the annular groove corresponding to the end of the sleeve cutting edge.

14. The clamping coliar of claim 1, wherein: The tapered groove includes a tapered section with a larger slope corresponding to the sleeve middle section and a flat section with a smaller slope corresponding to the sleeve tail section. The tapered section is located between the flat section and one end face of the joint body.

15. The clamping coliar coupling device of claim 14 wherein: A sealing ring is arranged in the flat section corresponding to the end of the sleeve tail section.

16. The clamping coliar of claim 1, wherein: The inner wall of the joint body has a radial step which is radially outwardly protruded and supported against the outer wall of the pipe.

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