Double-ferrule type pipe joint

Abstract

The utility model provides a double-clamping-sleeve type pipe joint which comprises a clamping sleeve joint, a clamping sleeve nut in threaded connection with the clamping sleeve joint, a connecting pipe arranged in the clamping sleeve nut and the clamping sleeve joint, and a front clamping sleeve and a rear clamping sleeve which are movably arranged outside the connecting pipe in a sleeving mode and arranged in the clamping sleeve nut. The double-ferrule type pipe joint comprises a ferrule connector, a connecting pipe, a ferrule nut, a locking assembly installed on the ferrule connector and the connecting pipe, and a limiting assembly installed on the ferrule connector and the ferrule nut, and the double-ferrule type pipe joint can pre-fix the connecting pipe before the connecting pipe is connected with the ferrule connector through the arranged locking assembly; the clamping sleeve nut is arranged on the clamping sleeve connector, the situation that transverse displacement occurs when the connecting pipe and the clamping sleeve connector are connected, and the fixing effect of the connecting pipe is affected is avoided, under control of the limiting assembly, after the clamping sleeve nut and the clamping sleeve connector rotate in place, position limitation can be obtained, and then the situation that the clamping sleeve nut rotates relative to the clamping sleeve connector due to vibration, and connection of the connecting pipe is loosened is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe joints, in particular to a double-ferrule type pipe joint. Background Art

[0002] Compression fittings are a new type of pipe connection component, available in either single or double ferrule configurations. Double ferrule fittings work by inserting a steel pipe into a compression fitting, then tightening the nut against the ferrule, cutting into the pipe and sealing. They eliminate the need for welding when connecting to steel pipes, facilitating fire and explosion protection, high-altitude operations, and eliminating the pitfalls of careless welding. Consequently, they are a leading connector for automated control systems in refining, chemical, petroleum, natural gas, food, pharmaceutical, and instrumentation systems. They are suitable for connecting oil, gas, and water pipelines.

[0003] When using a compression fitting, due to the external environment and the problem of its own installation position, the pipe fitting and the pipeline are prone to vibration during use, which can easily cause the nut to rotate and become loose, thereby affecting the resistance effect on the compression fitting, reducing the grip of the compression fitting on the pipeline, and easily affecting the tightness of the pipeline connection. Utility Model Content

[0004] The purpose of the utility model is to provide a double-ferrule type pipe joint to solve the above problems.

[0005] In order to achieve the above-mentioned object, the embodiment of the present invention provides a double-ferrule type pipe joint, comprising: a ferrule joint, a ferrule nut threadedly connected to the ferrule joint, a connecting pipe disposed within the ferrule nut and the ferrule joint, a front ferrule and a rear ferrule movably sleeved outside the connecting pipe and disposed within the ferrule nut, a locking assembly mounted on the ferrule joint and the connecting pipe, and a limiting assembly mounted on the ferrule joint and the ferrule nut;

[0006] The front ferrule and the rear ferrule are in contact between the inner wall of the ferrule nut and the ferrule joint, wherein

[0007] The locking assembly is suitable for reinforcing the connection between the connecting pipe and the ferrule nut;

[0008] The limiting assembly is suitable for limiting the movement of the ferrule nut and the ferrule joint.

[0009] Furthermore, the limiting assembly includes a hexagonal snap ring fixedly sleeved on the outside of the ferrule joint, a first end face toothed ring fixed to the side of the hexagonal snap ring close to the ferrule nut, an elastic member provided on the side of the ferrule nut close to the hexagonal snap ring, and a second end face toothed ring installed on the elastic member;

[0010] The first end face gear ring and the second end face gear ring are both ratchets, and the first end face gear ring and the second end face gear ring are meshed with each other.

[0011] Furthermore, the locking assembly includes a limiting ring fixedly sleeved on the outside of the connecting pipe, a locking sleeve rotatably connected to the outside of the ferrule nut and movably sleeved on the outside of the limiting ring, a plurality of positioning blocks annularly fixed on the inner wall of the locking sleeve, a plurality of movable grooves provided on the limiting ring and corresponding to the plurality of positioning blocks, and a locking member provided on the limiting ring and the plurality of positioning blocks;

[0012] The exterior of the locking sleeve is provided with concave and convex patterns.

[0013] Furthermore, the elastic member includes a plurality of control rings fixed in an annular array on the second end face gear ring, one end of which is fixedly connected to the ferrule nut, and the other end of which passes through a plurality of control rods of the control rings, a plurality of control blocks respectively fixed to the other ends of the plurality of control rods, and a plurality of return springs respectively movably sleeved on the plurality of control rods;

[0014] The two ends of the return spring are fixedly connected to the ferrule nut and one of the control rings respectively.

[0015] Furthermore, the locking member includes a plurality of locking protrusions respectively fixedly connected to the plurality of positioning blocks, a plurality of locking grooves arranged in an annular array on the limiting ring and corresponding to the plurality of locking protrusions respectively, and an elastic retaining ring movably sleeved on the connecting pipe;

[0016] Two sides of the elastic butt ring respectively butt against the limiting ring and the clamping nut.

[0017] Furthermore, the limiting assembly also includes two L-shaped pull rods symmetrically fixed on the second end face gear ring, and two control grooves respectively opened on the two L-shaped pull rods.

[0018] Furthermore, a sealing ring is fixedly sleeved on the outer wall of the connecting pipe, and the sealing ring is arranged between the rear ferrule and the ferrule joint.

[0019] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0020] 1. The double-ferrule type pipe joint is provided with a locking assembly to limit the position of the connecting pipe before and after the connection between the connecting pipe and the ferrule joint, thereby preventing the connecting pipe from axial displacement before and after the connection, thereby preventing the connecting pipe from displacement before the connection and affecting the squeezing and fixing effect of the front and rear ferrules on the connecting pipe. After the connecting pipe and the ferrule joint are connected and fixed, it is not easy to be separated from the ferrule joint due to dragging, thereby ensuring the connection stability of the connecting rod and facilitating the long-term use of the pipe joint.

[0021] 2. The double-ferrule type pipe joint is provided with a limit assembly. When the ferrule nut is rotated into place and the ferrule joint contacts the front ferrule and the rear ferrule to squeeze and lock the connecting pipe, the rotation of the ferrule nut can be effectively restricted. Therefore, when the connecting pipe vibrates during use, the ferrule nut will not rotate due to the vibration, thereby avoiding loosening of the connection between the ferrule nut and the ferrule joint, avoiding the reduction of the resistance force of the ferrule joint to the front ferrule and the rear ferrule to affect the gripping performance of the connecting pipe, thereby effectively avoiding the separation of the connecting pipe and the ferrule joint due to vibration, and ensuring the tightness of the connection between the connecting pipe and the ferrule joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 Shows a perspective view of the present utility model;

[0024] Figure 2 Shows a cutaway view of the present utility model;

[0025] Figure 3 Shows a partially cutaway perspective view of the present invention Figure 1 ;

[0026] Figure 4 Shows a partially cutaway perspective view of the present invention Figure 2 ;

[0027] Figure 5 Shows the partial split three-dimensional Figure 1 ;

[0028] Figure 6 Shows the partial split three-dimensional Figure 2 .

[0029] In the picture

[0030] 1. Ferrule joint; 2. Ferrule nut; 3. Connecting pipe; 4. Front ferrule; 5. Rear ferrule; 6. Locking assembly; 7. Limiting assembly; 8. Hexagonal retaining ring; 9. First end face tooth ring; 10. Elastic member; 11. Second end face tooth ring; 12. Limiting ring; 13. Locking sleeve; 14. Positioning block; 15. Movable groove; 16. Positioning member; 17. Control ring; 18. Control rod; 19. Control block; 20. Reset spring; 21. Positioning protrusion; 22. Positioning groove; 23. Elastic retaining ring; 24. L-shaped pull rod; 25. Control groove; 26. Sealing ring. DETAILED DESCRIPTION

[0031] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0032] like Figure 1-6 As shown, a double-ferrule type pipe joint includes: a ferrule joint 1, a ferrule nut 2 threadedly connected to the ferrule joint 1, a connecting pipe 3 disposed within the ferrule nut 2 and the ferrule joint 1, a front ferrule 4 and a rear ferrule 5 movably sleeved outside the connecting pipe 3 and disposed within the ferrule nut 2, a locking assembly 6 installed on the ferrule joint 1 and the connecting pipe 3, and a limiting assembly 7 installed on the ferrule joint 1 and the ferrule nut 2;

[0033] The front ferrule 4 and the rear ferrule 5 are in contact between the inner wall of the ferrule nut 2 and the ferrule joint 1, wherein

[0034] The locking assembly 6 is suitable for reinforcing the connection between the connecting pipe 3 and the ferrule nut 2;

[0035] The limiting component 7 is suitable for limiting the movement of the ferrule nut 2 and the ferrule joint 1. When in use, the front ferrule 4 and the rear ferrule 5 are placed in the ferrule nut 2, and the preliminary threaded connection between the ferrule joint 1 and the ferrule nut 2 is completed. Then the connecting pipe 3 is passed through the ferrule nut 2 and inserted into the ferrule joint 1. At this time, the position of the connecting rod can be limited by the provided locking component 6, and then when the ferrule nut 2 is rotated to make the ferrule joint 1 resist and squeeze the front ferrule 4 and the rear ferrule 5 to engage and lock the connecting pipe 3, the connecting pipe 3 will not have axial displacement, avoiding the position of the connecting pipe 3 in the ferrule joint 1 from being offset, affecting the stability of the connection between the ferrule joint 1 and the connecting pipe 3. After the connection between the ferrule joint 1 and the connecting pipe 3 is completed, the axial movement of the connecting rod can also be effectively limited, so that the connecting rod The connecting rod is not easily separated from the ferrule joint 1 due to dragging, which ensures the connection stability of the connecting rod and facilitates the long-term use of the pipe joint; and when the ferrule nut 2 is rotated to make the ferrule joint 1 and the ferrule nut 2 threadedly connected and tightened, the rotation of the ferrule nut 2 can be effectively restricted by the provided limit assembly 7, and then when the connecting pipe 3 vibrates during use, the ferrule nut 2 will not rotate due to the vibration, thereby avoiding the reduction of the resistance force of the ferrule joint 1 to the front ferrule 4 and the rear ferrule 5 and affecting the extrusion and fixing effect on the connecting pipe 3, thereby effectively avoiding the separation of the connecting pipe 3 and the ferrule joint 1 due to vibration, ensuring the tightness of the connection between the connecting pipe 3 and the ferrule joint 1, and when it is necessary to release the fixation of the connecting pipe 3, the rotation limit of the ferrule nut 2 can also be quickly released, which facilitates the removal of the connecting pipe 3 and the ferrule joint 1.

[0036] Optionally, the limiting assembly 7 includes a hexagonal snap ring 8 fixedly sleeved on the outside of the ferrule joint 1, a first end face toothed ring 9 fixed to the hexagonal snap ring 8 on the side close to the ferrule nut 2, an elastic member 10 provided on the side of the ferrule nut 2 close to the hexagonal snap ring 8, and a second end face toothed ring 11 mounted on the elastic member 10;

[0037] The first end face tooth ring 9 and the second end face tooth ring 11 are both ratchets, and the first end face tooth ring 9 and the second end face tooth ring 11 are meshed with each other. After the ferrule nut 2 is rotated into place and the front ferrule 4 and the rear ferrule 5 are controlled to clamp the connecting tube 3, the second end face tooth ring 11 will be controlled by the elastic member 10 to mesh with the first end face tooth ring 9, thereby limiting the rotation of the first end face tooth ring 9, so that the ferrule joint 1 will not rotate accidentally. When the connecting tube 3 and the ferrule joint 1 are used subsequently and are subjected to vibration and shaking, they will not become loose and cause the ferrule nut 2 to rotate, resulting in insufficient grip performance and affecting the tightness of the connection. Since the first end face tooth ring 9 and the second end face tooth ring 11 are both ratchets, the limiting effect of the first end face tooth ring 9 on the second end face tooth ring 11 when they are meshed is effectively guaranteed.

[0038] Optionally, the locking assembly 6 includes a limiting ring 12 fixedly sleeved on the outside of the connecting pipe 3, a locking sleeve 13 rotatably connected to the outside of the ferrule nut 2 and movably sleeved on the outside of the limiting ring 12, a plurality of positioning blocks 14 annularly fixed on the inner wall of the locking sleeve 13, a plurality of movable grooves 15 provided on the limiting ring 12 and corresponding to the plurality of positioning blocks 14, and a retaining member 16 provided on the limiting ring 12 and the plurality of positioning blocks 14;

[0039] When the connecting pipe 3 is passed through the ferrule nut 2 and inserted into the ferrule joint 1, attention should be paid to the one-to-one correspondence between the several positioning blocks 14 on the locking sleeve 13 and the several movable grooves 15 to avoid restricting the insertion movement of the connecting pipe 3. After the connection between the connecting pipe 3 and the ferrule joint 1 is completed, the locking sleeve 13 can be rotated to control the several positioning blocks 14 to be misaligned with the several movable grooves 15 and overlap with the limiting ring 12. With the cooperation of the positioning member 16, the several positioning blocks 14 are prevented from being separated from the limiting ring 12, and then under the control of the locking sleeve 13, the movement of the connecting pipe 3 in the joint nut is effectively restricted, thereby further improving the stability of the connection between the connecting pipe 3 and the ferrule joint 1 and effectively preventing the connecting pipe 3 from loosening. The concave and convex patterns on the locking sleeve 13 can effectively improve the stability of the staff when controlling the rotation of the locking sleeve 13, and facilitate the staff to rotate the locking sleeve 13.

[0040] Optionally, the elastic member 10 includes a plurality of control rings 17 fixed in an annular array on the second end face gear ring 11, one end of which is fixedly connected to the ferrule nut 2, and the other end of which passes through a plurality of control rods 18 of the control rings 17, a plurality of control blocks 19 respectively fixed to the other ends of the plurality of control rods 18, and a plurality of return springs 20 respectively movably sleeved on the plurality of control rods 18;

[0041] The two ends of the return spring 20 are fixedly connected to the sleeve nut 2 and one of the control rings 17 respectively. When the limit assembly 7 is in use, the second end face toothed ring 11 provided can be contacted with the first end face toothed ring 9 under the cooperation of the several control rings 17 and the several return springs 20. Under the restriction and guidance of the several control rods 18, it can be ensured that the several control rings 17 drive the second end face toothed ring 11 to move stably, and the interference effect of the second end face toothed ring 11 and the first end face toothed ring 9 is ensured. Under the action of the several control blocks 19, the moving position of the several control rings 17 can be restricted to prevent the several control rings 17 from driving the second end face toothed ring 11 to disengage from the sleeve nut 2; and when it is necessary to rotate the sleeve nut 2 or the sleeve joint 1, the several control rings 17 can be pulled to drive the second end face toothed ring 11 to compress the several return springs 20, so as to control the second end face toothed ring 11 to disengage from the first end face toothed ring 9 and release the restriction on the first end face toothed ring 9.

[0042] Optionally, the locking member 16 includes a plurality of locking protrusions 21 respectively fixedly connected to the plurality of positioning blocks 14, a plurality of locking grooves 22 arranged in an annular array on the limiting ring 12 and corresponding to the plurality of locking protrusions 21, and an elastic retaining ring 23 movably sleeved on the connecting pipe 3;

[0043] The two sides of the elastic push ring 23 are respectively against the limit ring 12 and the sleeve nut 2. When controlling the locking assembly 6, when the plurality of positioning blocks 14 are rotated to control them to coincide with the limit ring 12, the elastic push ring 23 can support the limit ring 12, so that the plurality of positioning protrusions 21 can be stably inserted into the plurality of positioning grooves 22, and the position of the plurality of positioning blocks is limited, thereby ensuring the limiting and reinforcing effect of the locking assembly 6 on the connecting pipe 3.

[0044] Optionally, the limit assembly 7 also includes two L-shaped pull rods 24 symmetrically fixed on the second end face tooth ring 11, and two control grooves 25 respectively opened on the two L-shaped pull rods 24. When the connecting pipe 3 needs to be removed, the staff can insert two fingers into two of the control grooves 25 and pull the two L-shaped pull rods 24, thereby controlling the second end face tooth ring 11 to disengage from the first end face tooth ring 9 and release the restriction on the ferrule joint 1. At this time, the ferrule joint 1 can be rotated to control the release of the restriction on the connecting pipe 3 and remove the connecting pipe 3.

[0045] Optionally, a sealing ring 26 is fixedly sleeved on the outer wall of the connecting pipe 3, and the sealing ring 26 is arranged between the rear ferrule 5 and the ferrule joint 1. When the connecting pipe 3 is passed through the ferrule nut 2 and inserted into the ferrule joint 1, the provided sealing ring 26 will be between the rear ferrule 5 and the ferrule joint 1, thereby performing preliminary positioning of the connecting pipe 3, and then when the subsequent locking component 6 works and the connecting pipe 3 is connected and reinforced, the stability of the connecting pipe 3 can be ensured. At the same time, when the front ferrule 4 and the rear ferrule 5 squeeze and lock the connecting pipe 3, the provided sealing ring 26 can further improve the airtightness of the connection between the ferrule joint 1 and the connecting pipe 3, so as to ensure the sealing effect at the contact between the ferrule joint 1 and the connecting pipe 3.

[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A double ferrule type pipe joint, characterized in that: include: A ferrule joint (1), a ferrule nut (2) threadedly connected to the ferrule joint (1), a connecting pipe (3) arranged between the ferrule nut (2) and the ferrule joint (1), a front ferrule (4) and a rear ferrule (5) movably sleeved outside the connecting pipe (3) and arranged in the ferrule nut (2), a locking assembly (6) installed on the ferrule joint (1) and the connecting pipe (3), and a limiting assembly (7) installed on the ferrule joint (1) and the ferrule nut (2); The front ferrule (4) and the rear ferrule (5) are in contact between the inner wall of the ferrule nut (2) and the ferrule joint (1), wherein The locking assembly (6) is suitable for reinforcing the connection between the connecting pipe (3) and the ferrule nut (2); The limiting assembly (7) is suitable for limiting the movement of the ferrule nut (2) and the ferrule joint (1).

2. A double-ferrule type pipe joint according to claim 1, characterized in that: The limiting assembly (7) includes a hexagonal snap ring (8) fixedly sleeved on the outside of the ferrule joint (1), a first end face toothed ring (9) fixed on the side of the hexagonal snap ring (8) close to the ferrule nut (2), an elastic member (10) arranged on the side of the ferrule nut (2) close to the hexagonal snap ring (8), and a second end face toothed ring (11) mounted on the elastic member (10); The first end face tooth ring (9) and the second end face tooth ring (11) are both ratchets, and the first end face tooth ring (9) and the second end face tooth ring (11) are meshed with each other.

3. A double-ferrule type pipe joint according to claim 2, characterized in that: The locking assembly (6) includes a limiting ring (12) fixedly sleeved on the outside of the connecting pipe (3), a locking sleeve (13) rotatably connected to the outside of the clamping nut (2) and movably sleeved on the outside of the limiting ring (12), a plurality of positioning blocks (14) annularly fixed on the inner wall of the locking sleeve (13), a plurality of movable grooves (15) provided on the limiting ring (12) and corresponding to the plurality of positioning blocks (14), and a positioning member (16) provided on the limiting ring (12) and the plurality of positioning blocks (14); The exterior of the locking sleeve (13) is provided with concave and convex patterns.

4. A double-ferrule type pipe joint according to claim 3, characterized in that: The elastic member (10) includes a plurality of control rings (17) fixed on the second end face gear ring (11) in an annular array, one end of which is fixedly connected to the clamping nut (2), and the other end of which passes through a plurality of control rods (18) of the control rings (17), a plurality of control blocks (19) fixed on the other ends of the plurality of control rods (18), and a plurality of return springs (20) movably sleeved on the plurality of control rods (18); The two ends of the return spring (20) are respectively fixedly connected to the ferrule nut (2) and one of the control rings (17).

5. A double-ferrule type pipe joint according to claim 4, characterized in that: The locking member (16) includes a plurality of locking protrusions (21) respectively fixedly connected to the plurality of positioning blocks (14), a plurality of locking grooves (22) arranged in an annular array on the limiting ring (12) and corresponding to the plurality of locking protrusions (21), and an elastic retaining ring (23) movably sleeved on the connecting pipe (3); Both sides of the elastic abutment ring (23) respectively abut against the limiting ring (12) and the clamping sleeve nut (2).

6. A double-ferrule type pipe joint according to claim 5, characterized in that: The limiting assembly (7) further comprises two L-shaped pull rods (24) symmetrically fixed on the second end face gear ring (11), and two control grooves (25) respectively provided on the two L-shaped pull rods (24).

7. A double-ferrule type pipe joint according to claim 1, characterized in that: A sealing ring (26) is fixedly sleeved on the outer wall of the connecting pipe (3), and the sealing ring (26) is arranged between the rear ferrule (5) and the ferrule joint (1).

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