CN217713990U - Conduit connector for metal hose - Google Patents
Conduit connector for metal hose Download PDFInfo
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- CN217713990U CN217713990U CN202222052240.9U CN202222052240U CN217713990U CN 217713990 U CN217713990 U CN 217713990U CN 202222052240 U CN202222052240 U CN 202222052240U CN 217713990 U CN217713990 U CN 217713990U
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Abstract
The utility model discloses a conduit coupling for metal hose, which comprises a joint, loop nut and ball joint, connect including first body, first body one end periphery fixedly connected with is protruding, protruding one side fixedly connected with spherical head, it is protruding, the axial lead department of spherical head runs through the first pore that is provided with the inside intercommunication of first body, the loop nut includes nut head and nut, nut head and nut fixed connection, the first inside draw-in groove of having seted up of nut, logical groove has been seted up to the first terminal surface of nut, it link up to lead to the groove, draw-in groove and nut are inside, ball joint includes the second body. The utility model relates to a metal collapsible tube technical field. The conduit connecting piece for the metal hose can effectively avoid pressure damage generated by a ball head-conical surface structure sealing surface and guarantee a better sealing effect, so that the hidden danger of loosening and releasing is prevented to the maximum extent, and the reliability and the safety of a product are improved.
Description
Technical Field
The utility model relates to a metal collapsible tube technical field specifically is conduit coupling for metal collapsible tube.
Background
The bulb-conical surface structure in the conduit connecting piece is a common connecting form, and has the advantages of good sealing performance and convenience in disassembly. The conduit coupling is mainly applied to the fields of aerospace and the like. When the bulb-conical surface structure is actually assembled, an operator generally applies torque to the catheter joint by using a common wrench according to experience to tighten the catheter joint, but the tightening torque has no definite requirement, so that the catheter joint is often over tightened to ensure the sealing effect.
The prior art has the following defects and shortcomings:
1. under the action of excessive stress, local plastic deformation is caused by the mutual contact surfaces (such as thread flank surfaces, all supporting surfaces and the mutual contact surfaces of connecting pieces) in the threaded connection due to surface roughness, waviness, form and position errors and the like, and the plastic deformation can be continuously developed in the use process, so that the connection pretightening force is reduced, the loosening phenomenon is caused, and the reliability of the conduit connecting piece is not high.
2. The threaded connection causes the metal hose joint to be unable to be fixed tightly, even the condition that possibly takes place gas leakage, and the risk that the metal hose body breaks and leaks in the use increases.
SUMMERY OF THE UTILITY MODEL
The utility model provides a not enough to prior art, the utility model provides a conduit coupling for metal hose has solved current problem.
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: the pipe connecting piece for the metal hose comprises a joint, a loop nut and a spherical joint, wherein the joint comprises a first pipe body, the periphery of one end of the first pipe body is protruded, one side of the protrusion is fixedly connected with the spherical head, a first hole communicated with the inside of the first pipe body is formed in the shaft center line of the protrusion and the spherical head in a penetrating mode, the loop nut comprises a nut head and a nut, the nut head is fixedly connected with the nut, a clamping groove is formed in the nut head, a through groove is formed in one end face of the nut head, the through groove, the clamping groove and the nut are communicated in the inside, a sealing ring is fixedly mounted on the inner wall of one end, far away from the nut head, of the nut, the spherical joint comprises a second pipe body, a bolt head is fixedly connected with one end of the second pipe body, one end of the bolt head is fixedly connected with a bolt rod, one end of the bolt rod is conical surface, the shaft center line of the conical surface, the bolt rod and the bolt head is provided with a second hole communicated with the inside of the second pipe body in a penetrating mode, and a clamp piece is sleeved on the periphery of the nut.
Preferably, the joint and the spherical joint are made of 1Cr18Ni9Ti, and the loop nut is made of 2Cr13.
Preferably, the inner diameter of the through groove is matched with the outer diameter of the first pipe body, and the first pipe body is movably clamped inside the through groove.
Preferably, the inner diameter of the clamping groove is matched with the outer diameter of the protrusion, and the protrusion is movably clamped inside the clamping groove.
Preferably, the radian of the spherical surface of the spherical head is matched with the radian of the surface of the conical surface, and the spherical head is movably clamped in the conical surface.
Preferably, the inner diameter of the nut is matched with the outer diameter of the bolt rod, and the nut is movably sleeved on the bolt rod and is in threaded connection with the bolt rod.
Preferably, the clamp piece includes the arc snap ring, the both ends of arc snap ring are fixedly connected with mounting panel respectively, set up threaded hole on the mounting panel.
Advantageous effects
The utility model provides a conduit coupling for metal collapsible tube, compare with prior art and possess following beneficial effect:
the conduit connecting piece for the metal hose comprises a joint, a loop nut and a spherical joint, can effectively avoid pressure damage generated by a ball head-conical surface structure sealing surface by adopting the conduit connecting piece with the new structure, and simultaneously ensures a better sealing effect by arranging a sealing ring and a clamp part, so that the hidden danger of loosening and releasing is prevented to the maximum extent, and the reliability and the safety of a product are improved.
Drawings
FIG. 1 is a schematic view of the overall explosion structure of the present invention;
fig. 2 is the schematic view of the overall cross-sectional structure of the present invention.
In the figure: 1. a joint; 11. a first pipe body; 12. a protrusion; 13. a spherical head; 2. a loop nut; 21. a nut head; 211. a card slot; 212. a through groove; 22. a nut; 221. a seal ring; 3. a ball joint; 31. a second tube body; 32. a bolt head; 33. a bolt shank; 34. a conical surface; 4. a clamp member; 41. an arc-shaped snap ring; 42. mounting a plate; 421. a threaded bore.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides a technical solution: conduit coupling for metal hose, including connecting 1, loop nut 2 and spherical joint 3, connect 1 including first body 11, first body 11 one end periphery fixedly connected with is protruding 12, protruding 12 one side fixedly connected with spherical head 13, protruding 12, the axial lead department of spherical head 13 runs through the first pore that is provided with the inside intercommunication of first body 11, loop nut 2 includes nut head 21 and nut 22, nut head 21 and nut 22 fixed connection, nut head 21 has inside seted up draw-in groove 211, logical groove 212 has been seted up to nut head 21 one end, lead to groove 212, draw-in groove 211 and the inside link up of nut 22, spherical joint 3 includes second body 31, second body 31 one end fixedly connected with bolt head 32, bolt head 32 one end fixedly connected with bolt pole 33, bolt pole 33 one end has seted up conical surface 34, bolt rod 33, the axial lead department of bolt head 32 runs through and is provided with the second pore that communicates with the inside of second body 31, the periphery of nut 22 has clamp sleeve joint spare 4.
In the embodiment, the joint 1 and the spherical joint 3 are made of 1Cr18Ni9Ti, the loop nut 2 is made of 2Cr13, and stainless steel is adopted to improve the corrosion resistance; the inner diameter of the through groove 212 is matched with the outer diameter of the first pipe body 11, the first pipe body 11 is movably clamped inside the through groove 212, the inner diameter of the clamping groove 211 is matched with the outer diameter of the protrusion 12, the protrusion 12 is movably clamped inside the clamping groove 211, the spherical radian of the spherical head 13 is matched with the surface radian of the conical surface 34, the spherical head 13 is movably clamped inside the conical surface 34, and the joint 1 can penetrate through the through groove 212 through the first pipe body 11, is movably clamped in the inner cavity of the union nut 2 firstly, and is in abutting contact with the conical surface 34 through the spherical head 13; the inner diameter of the nut 22 is matched with the outer diameter of the bolt rod 33, the nut 22 is movably sleeved on the bolt rod 33 and is in threaded connection with the bolt rod 33, the looper nut 2 is tightly and fixedly arranged on the spherical joint 3 through the threaded connection of the nut 22 and the bolt rod 33, the spherical head 13 is fully abutted against and contacted with the conical surface 34, and a sealed connecting passage is formed inside the joint 1 and the spherical joint 3; nut 22 keeps away from the one end inner wall fixed mounting of nut head 21 has sealing washer 221, clamp 4 includes arc snap ring 41, the both ends difference fixedly connected with mounting panel 42 of arc snap ring 41, threaded hole 421 has been seted up on the mounting panel 42, improve nut 22 and the sealing performance of shank of bolt 33 threaded connection through sealing washer 221, simultaneously through overlapping arc snap ring 41 in the nut 22 periphery, through locking bolt and threaded hole 421 threaded connection, utilize arc snap ring 41 to consolidate nut 22 and shank of bolt 33 threaded connection department, increase nut 22 and shank of bolt 33 and the sealed inseparable degree of sealing washer 221, prevent to reveal the corruption influence that reduces external environment to nut 22 and shank of bolt 33 threaded connection department on the one hand, and the stability of structure is improved.
In the embodiment, the tightening torque of the special conduit connecting piece for the metal hose is subjected to simulation analysis and test verification to obtain a tightening torque range, so that a product test is guided, and the reliability of the product is verified.
1. Structural design
The structure of the conduit connecting piece is shown in figure 1, the spherical head 13-the conical surface 34 are in line contact before screwing, and after the screwing torque is applied, the contact surface of the spherical head 13-the conical surface 34 forms an annular sealing surface with full circle contact.
Firstly, axial centering of the spherical head 13 and the conical surface 34 is guaranteed, contact stress of a sealing surface is reasonably distributed, then the loose nut 2, the joint 1 and the spherical joint 3 are horizontally placed on the same plane and assembled, the nut 22 and the bolt rod 33 are screwed up manually under a non-pressurizing state (screwed up under a non-pressurizing state), one end of the bolt head 32 is fixed by a spanner, one end of the nut head 21 applies a screwing torque by a torque spanner, and one end of a test joint installed on the torque spanner is connected with a test bench for testing.
2. Theoretical calculation of
The tightening torque overcomes the friction torque of the three contact surfaces: friction torque M1 of the loop nut 2 and the spherical joint 3; friction moment M2 of the contact surface of the spherical joint 3 and the joint 1; friction moment M3 between the inner thread and the outer thread of the loop nut 2 and the spherical joint 3.
M1＝0.5FfdWμW (1)
M2＝0.5Ffd2μ2/cosα (2)
M3＝0.5Ffdρ(1.15μs+tanβ) (3)
The tightening torque is:
M＝M1+M2+M3＝0.5Ff[dWμW+d2μ2/cosα+dρ(1.15μs+tanβ)] (4)
in the formula: ffAxial pre-tightening force is adopted; dWIs the equivalent diameter of the supporting surface; mu.sWIs the support surface friction factor; d is a radical of2The equivalent diameter of the contact surface of the spherical joint and the joint is; mu.s2The friction factor of the contact surface of the spherical joint and the joint is; alpha is the inclination angle of the conical surface of the joint; dρIs the effective diameter of the external thread of the joint; mu s is a loop nut anda joint thread pair friction factor; beta is the lead angle.
3. Simulation analysis
3.1 model building
Taking model DN4 conduit connecting piece as an example, based on three-dimensional modeling software, an equivalent three-dimensional model is established.
3.2 Material parameter definition
The spherical joint 3 and the joint 1 are made of 1Cr18Ni9Ti, the loop nut 2 is made of 2Cr13, material parameters are shown in a table 1, and a bilinear equidirectional strengthening model is adopted because the contact surfaces of the conical surfaces of the spherical joint 3 and the joint 1 are mutually extruded, no cyclic loading and reverse loading are realized, and the bilinear equidirectional strengthening model is matched with the stress-strain relation of an actual material under the condition of no cyclic loading according to the stress-strain corresponding relation of a stainless steel material.
TABLE 1 Material parameters
3.3 meshing
And carrying out mesh division by using a tetrahedral and hexahedral division combination method.
3.4 contact and boundary condition definition
The spherical joint 3 and the loop nut 2, the spherical joint 3 and the joint 1 adopt friction constraint, the loop nut 2 and the joint 1 adopt fixed constraint, an enhanced Lagrange method is adopted, a series of correction iteration is carried out on the penalty function, so that an accurate Lagrange multiplier is found, the function is solved, the axial pretightening force Ff applied to the loop nut 2 is applied to the joint, a fixed constraint boundary condition is applied to the joint, and pressure is applied to the inside.
3.5 simulation results
By using ANSYS workbench to perform contact nonlinear calculation, it can be obtained that the stress is concentrated on the position, close to the sealing line, on the sealing surface of the joint 1.
The contact surface compressive stress is analyzed, the spherical surface and the joint contact line deform under the condition of axial force to form surface contact, the relation between the torque and the effective sealing surface width is obtained according to the simulation result, and the larger the tightening torque is, the better the sealing effect is.
In summary, the conduit coupling is within the strength limits of the structure under reasonable tightening torque applied.
4. Test verification
The test is carried out according to the technical conditions of simulation conclusion, HB5535-83 technical conditions of spherical pipeline connectors, RG-TYGY007-2020 technical specification of helium testing of metal hoses and the like, and the test scheme is as shown in the following table 2.
TABLE 2 test protocol
The test is carried out according to the test scheme, and the final test result shows that the test piece does not generate leakage through a hydraulic test, and the integral leakage amount is 3.3 multiplied by 10 < -8 > Pa.m/s and is less than the specified leakage rate through the positive pressure helium detection; the joint-conical surface sealing surface is inspected by a microscope in an amplifying way, and slight indentation is formed, so that the continuous normal use is not influenced; and respectively carrying out thread inspection on the joint 1 and the loop nut 2 by using a gauge, wherein the thread size does not generate an out-of-tolerance according to the inspection result.
5. Conclusion
The test shows that reasonable tightening torque is applied to the conduit connection piece within the normal working pressure range, the conduit connection piece with the new structure can effectively avoid pressure damage generated by a ball head-conical surface structure sealing surface, and simultaneously ensures better sealing effect, so that the hidden danger of loosening and loosening is prevented to the maximum extent, the reliability and the safety of a product are improved, and the proper tightening torque is verified through comparison structure simulation and test to ensure that the sealing performance of the conduit connection piece can also ensure the quality of the sealing surface.
And those not described in detail in this specification are well within the skill of those in the art.
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The conduit connecting piece for the metal hose comprises a joint (1), a loop nut (2) and a spherical joint (3), and is characterized in that: the joint (1) comprises a first pipe body (11), a protrusion (12) is fixedly connected to the periphery of one end of the first pipe body (11), a spherical head (13) is fixedly connected to one side of the protrusion (12), a first hole communicated with the inside of the first pipe body (11) is arranged at the axial lead of the protrusion (12) and the spherical head (13) in a penetrating mode, the loop nut (2) comprises a nut head (21) and a nut (22), the nut head (21) is fixedly connected with the nut (22), a clamping groove (211) is formed in the nut head (21), a through groove (212) is formed in one end face of the nut head (21), the through groove (212), the clamping groove (211) and the nut (22) are communicated in an internal mode, a sealing ring (221) is fixedly installed on the inner wall of one end, far away from the nut head (21), of the spherical joint (3) comprises a second pipe body (31), a bolt head (32) is fixedly connected to one end of the second pipe body (31), a bolt rod (32) is fixedly connected to one end of the conical surface, a conical surface of the bolt rod (33) is formed in a penetrating mode, and a second hole (31) is arranged at the axial lead of the second pipe body (31), and a clamping hoop part (4) is sleeved on the periphery of the nut (22).
2. The conduit coupling of claim 1, wherein: the joint (1) and the spherical joint (3) are made of 1Cr18Ni9Ti, and the loop nut (2) is made of 2Cr13.
3. The conduit coupling of claim 1, wherein: the inner diameter of the through groove (212) is matched with the outer diameter of the first pipe body (11), and the first pipe body (11) is movably clamped in the through groove (212).
4. The pipe joint according to claim 1, wherein: the inner diameter of the clamping groove (211) is matched with the outer diameter of the protrusion (12), and the protrusion (12) is movably clamped inside the clamping groove (211).
5. The conduit coupling of claim 1, wherein: the radian of the spherical surface of the spherical head (13) is matched with the radian of the surface of the conical surface (34), and the spherical head (13) is movably clamped in the conical surface (34).
6. The conduit coupling of claim 1, wherein: the inner diameter of the nut (22) is matched with the outer diameter of the bolt rod (33), and the nut (22) is movably sleeved on the bolt rod (33) and is in threaded connection with the bolt rod (33).
7. The conduit coupling of claim 1, wherein: the clamp piece (4) comprises an arc-shaped clamping ring (41), two ends of the arc-shaped clamping ring (41) are fixedly connected with mounting plates (42) respectively, and threaded holes (421) are formed in the mounting plates (42).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222052240.9U CN217713990U (en) | 2022-08-05 | 2022-08-05 | Conduit connector for metal hose |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222052240.9U CN217713990U (en) | 2022-08-05 | 2022-08-05 | Conduit connector for metal hose |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217713990U true CN217713990U (en) | 2022-11-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222052240.9U Active CN217713990U (en) | 2022-08-05 | 2022-08-05 | Conduit connector for metal hose |
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| Country | Link |
|---|---|
| CN (1) | CN217713990U (en) |
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- 2022-08-05 CN CN202222052240.9U patent/CN217713990U/en active Active
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