Axially adjustable movable joint

Abstract

The utility model discloses an axially adjustable movable joint which comprises a first locking nut, a first joint, a second joint, a movable joint and a second locking nut. The first locking nut is used for locking the first connector and the second connector. The first connector and the movable connector are used for being connected with a hard pipe. The second connector is used for being connected with the movable connector, and the second locking nut is used for locking the movable connector and the second connector. And the movable joint is in threaded connection with the second joint, can axially move to adjust the length, and is locked by a second locking nut. In the axial adjustment process of the movable joint, no cavity structure exists between the movable joint and the second joint, so that gas cannot be stored, and the reset of the movable joint cannot be damped due to the stored gas. The movable joint is in threaded connection with the second joint, and the second joint and the first joint are respectively locked by the first locking nut, so that the first joint is not influenced in the process of screwing the movable joint, and the connection stability of the first joint and the hard pipe is favorably maintained.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe joints, in particular to an axially adjustable movable joint. Background Art

[0002] In the gas transportation of automated production lines, hard pipe connections are often used. Since most components are fixedly installed, unions are often used to connect pipe fittings. Unions, also known as live joints, are a common pipe connector that can be easily installed and disassembled. When connecting two pipe fittings, the two hard pipes can be connected and separated without moving the pipe fittings, which is convenient for assembly and maintenance.

[0003] In the prior art, a Chinese invention patent with publication number CN 114294488 A discloses a sealing joint with adjustable axial length, including a first joint, a second joint, and a stopper; an abutting portion is provided in the first joint, and a stopper is provided at one end of the first joint away from the abutting portion; a flange portion is provided on the outside of the second joint; the flange portion of the second joint is inserted into the first joint and is limited in axial movement by the abutting portion, the flange portion is limited between the abutting portion and the stopper, and can move axially between the abutting portion and the stopper; the flange portion is provided with an annular groove, and a sealing member is provided in the annular groove, and the sealing member fills the gap between the first joint and the second joint; a groove portion is provided around the inner peripheral wall of the first joint, and the groove portion is opposite to the outer peripheral wall of the second joint, and cooperates with each other to form a labyrinth seal. The joint of the present invention has adjustable length and good sealing performance, can compensate for changes in pipeline spacing caused by phenomena such as thermal expansion and contraction, is easy to use and flexible, and has a simple joint structure and low production cost.

[0004] However, when the first joint is axially adjusted relative to the second joint, a cavity is formed between the abutment portion of the first joint and the flange portion of the second joint, and gas enters the cavity through the gap between the threaded connection surfaces of the first joint and the second joint. When the second joint needs to be shortened or reset, the gas in the cavity is squeezed out, and it takes a long time for the gas to be discharged from the gap, which damps the movement of the second joint and requires a large torque, increasing the difficulty of operation.

[0005] In addition, since the second joint is directly threadedly connected to the first joint, when the second joint needs to be twisted, the first joint needs to bear reverse torque, which will affect the sealing performance of the connection between the first joint and the pipe body.

[0006] In view of this, it is necessary to provide a new type of axially adjustable movable joint. Utility Model Content

[0007] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a new type of axially adjustable movable joint, in which the first joint and the second joint are locked by a first nut, the movable joint is threadedly connected to the second joint, and can be axially moved to adjust the length, and the movable joint is finally locked by a second locking nut. During the axial adjustment of the movable joint, there is no cavity structure between it and the second joint, so no gas will be stored, and the resetting of the movable joint will not be damped by the stored gas. The movable joint is threadedly connected to the second joint, and the second joint and the first joint are locked by the first nut respectively, so the first joint will not be affected during the process of twisting the movable joint, which is conducive to maintaining the stability of the connection between the first joint and the pipe body.

[0008] The technical solution of the utility model provides an axially adjustable movable joint, comprising a first locking nut, a first joint, a second joint, a movable joint and a second locking nut;

[0009] The first end of the first connector is connected to the first locking nut, and the second end of the first connector extends out of the first locking nut;

[0010] The first end of the second connector is threadedly connected to the first locking nut and presses the first end of the first connector, and the second end of the second connector extends out of the outside of the first locking nut;

[0011] The first end of the movable joint is threadedly connected to the second joint, and the second end of the movable joint extends out of the outside of the second joint;

[0012] The second locking nut is threadedly connected to the movable joint and locked on one side of the second end of the second joint;

[0013] A sealing gasket is provided between the first end of the first joint and the first end of the second joint, a first sealing ring is provided between the movable joint and the second joint, and a second sealing ring is provided on the end surface of the second end of the second joint.

[0014] In one of the optional technical solutions, the axially adjustable movable joint includes two second-second locking nuts, which are respectively threadedly connected to the movable joint, wherein the first second locking nut is locked to the second end of the second joint, and the second second locking nut presses the first second locking nut.

[0015] In one of the optional technical solutions, the first end of the first joint has a radially protruding joint protrusion ring;

[0016] The first end of the first locking nut has a nut protruding ring protruding toward the central hole of the nut;

[0017] The joint convex ring is located inside the nut convex ring, and the joint convex ring presses the nut convex ring, and the first end of the second joint presses the joint convex ring;

[0018] The sealing gasket is clamped between the joint convex ring and the end surface of the first end of the second joint.

[0019] In one of the optional technical solutions, the joint protruding ring is integrally formed with the first joint, and the nut protruding ring is integrally formed with the first locking nut.

[0020] In one of the optional technical solutions, a preset distance is provided between the joint convex ring and the end surface of the first end of the first joint;

[0021] The end surface of the first end of the second joint has an annular groove, and the first end of the first joint is embedded in the annular groove.

[0022] In one of the optional technical solutions, the first end of the second joint has a joint retaining ring protruding toward the joint through hole;

[0023] The inner diameter of the joint retaining ring is smaller than the inner diameter of the movable joint;

[0024] When the movable joint is axially shortened to a limit position, the first end of the movable joint presses the joint retaining ring.

[0025] In one of the optional technical solutions, the inner diameter of the joint retaining ring is larger than the inner diameter of the first joint and smaller than the outer diameter of the first joint.

[0026] In one of the optional technical solutions, the joint retaining ring and the second joint are integrally formed.

[0027] In one of the optional technical solutions, a plurality of the first sealing rings are provided at intervals between the movable joint and the second joint.

[0028] In one of the optional technical solutions, the first sealing ring is connected to the circumferential surface of the first end of the movable joint.

[0029] The above technical solution has the following beneficial effects:

[0030] The utility model provides an axially adjustable movable joint, comprising a first locking nut, a first joint, a second joint, a movable joint and a second locking nut. The first locking nut is used to lock the first joint and the second joint. The first joint and the movable joint are respectively used to connect a hard pipe. The second joint is used to connect the movable joint, and the second locking nut is used to lock the movable joint with the second joint. The movable joint is threadedly connected to the second joint and can be axially moved to adjust the length, and the movable joint is finally locked by the second locking nut. During the axial adjustment of the movable joint, there is no cavity structure between it and the second joint, so that gas will not be stored, and the resetting of the movable joint will not be damped due to the stored gas. The movable joint is threadedly connected to the second joint, and the second joint and the first joint are respectively locked by the first locking nut, so the first joint will not be affected during the process of twisting the movable joint, which is conducive to maintaining the connection stability between the first joint and the hard pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The disclosure of the present invention will become easier to understand with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings:

[0032] Figure 1 A three-dimensional diagram of an axially adjustable movable joint provided in one embodiment of the utility model;

[0033] Figure 2 A cross-sectional view of an axially adjustable movable joint provided in one embodiment of the utility model, wherein one end of the movable joint is in contact with a joint retaining ring;

[0034] Figure 3 A cross-sectional view of an axially adjustable movable joint provided in one embodiment of the utility model, wherein one end of the movable joint is in a separated state from the joint retaining ring;

[0035] Figure 4 An exploded view of an axially adjustable movable joint provided in one embodiment of the utility model;

[0036] Figure 5 is a cross-sectional view of the first locking nut;

[0037] Figure 6 is a cross-sectional view of the first joint;

[0038] Figure 7 is a cross-sectional view of the second joint;

[0039] Figure 8 It is a cross-sectional view of the movable joint and the second locking nut. DETAILED DESCRIPTION

[0040] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings. The same parts are represented by the same figure numbers. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0041] like Figure 1-8 As shown, an axially adjustable movable joint provided by an embodiment of the utility model includes a first locking nut 1, a first joint 2, a second joint 3, a movable joint 4 and a second locking nut 5.

[0042] The first end 21 of the first joint 2 is connected to the first locking nut 1 , and the second end 22 of the first joint 2 extends out of the outside of the first locking nut 1 .

[0043] The first end 31 of the second joint 3 is threadedly connected in the first locking nut 1 and presses the first end 21 of the first joint 2 , and the second end 32 of the second joint 3 extends out of the outside of the first locking nut 1 .

[0044] The first end 41 of the movable joint 4 is threadedly connected to the second joint 3 , and the second end 42 of the movable joint 4 extends out of the outside of the second joint 3 .

[0045] The second locking nut 5 is threadedly connected to the movable joint 4 and locked on one side of the second end 32 of the second joint 3 .

[0046] A sealing gasket 6 is provided between the first end 21 of the first joint 2 and the first end 31 of the second joint 3 , a first sealing ring 7 is provided between the movable joint 4 and the second joint 3 , and a second sealing ring 8 is provided on the end surface of the second end 32 of the second joint 3 .

[0047] The axially adjustable movable joint provided by the utility model is used to connect two hard pipes, such as connecting hard plastic pipes or metal pipes. Accordingly, the movable joint can be a plastic joint or a metal joint.

[0048] The axially adjustable movable joint comprises a first locking nut 1, a first joint 2, a second joint 3, a movable joint 4 and a second locking nut 5. The assembled locking nut 1, the first joint 2, the second joint 3, the movable joint 4 and the second locking nut 5 are coaxially arranged.

[0049] The first locking nut 1 is used to lock the first joint 2 and the second joint 3. The first joint 2 and the second joint 3 are fixed joints. The movable joint 4 can be axially adjusted relative to the second joint 3. The first joint 2 and the movable joint 4 are respectively used to connect the hard pipes, and the extension length of the movable joint 4 can be adjusted according to the distance between the two hard pipes to facilitate the connection.

[0050] Specifically, the first locking nut 1 includes a first end 11 and a second end 12 that are opposite to each other, and an internal thread is disposed on a circumferential surface 14 of a nut center hole 13 of the first locking nut 1 .

[0051] The first joint 2 includes a first end 21 and a second end 22 opposite to each other. The circumferential surface 24 of the joint center hole 23 of the first joint 2 has an internal thread to connect with the hard pipe. The outer circumferential surface of the first joint 2 may be provided with an external thread or a clamping structure may be provided on the first end 21 of the first joint 2 to connect the first end 21 of the first joint 2 to the first end 11 of the first locking nut 1. The second end 22 of the first joint 2 extends out of the outside of the first locking nut 1. One end of the hard pipe may be connected to the first joint 2 from the second end 22.

[0052] The second joint 3 includes a first end 31 and a second end 32 opposite to each other. The circumferential surface 34 of the joint center hole 33 of the second joint 3 has an internal thread for connecting the movable joint 4. The outer circumferential surface 35 of the second joint 3 is provided with an external thread for threaded connection with the first locking nut 1. The first end 31 of the second joint 3 is threadedly connected to the first locking nut 1, and the first end 31 of the second joint 3 is pressed against the first end 21 of the first joint 2. The second end 32 of the second joint 3 extends outward from the second end 12 of the first locking nut 1.

[0053] The movable joint 4 includes a first end 41 and a second end 42 opposite to each other. The joint center hole 43 of the movable joint 4 has an internal thread for connection with a hard pipe. The outer peripheral surface 45 of the movable joint 4 has an external thread for threaded connection with the second joint 3 and the second locking nut 5. The first end 41 of the movable joint 4 is threadedly connected to the second joint 3, and the second end 42 of the movable joint 4 extends outside the second end 32 of the second joint 3. One end of the hard pipe can be connected to the movable joint 4 from the second end 42. Since the movable joint 4 and the second joint 3 are threadedly connected, the depth of the movable joint 4 inserted into the second joint 3 can be adjusted by rotating the movable joint 4, that is, the axial distance between the movable joint 4 and the first joint 2 is adjusted, so that the axial length of the movable joint can be adjusted.

[0054] The second locking nut 5 is threadedly connected to the movable joint 4 and is located outside the second end 32 of the second joint 3. After the movable joint 4 is axially adjusted to a desired position, the second locking nut 5 is tightened, and the second locking nut 5 presses the second end 32 of the second joint 3 to lock the movable joint 4.

[0055] In order to achieve sealing, a sealing gasket 6 is provided between the first end 21 of the first joint 2 and the first end 31 of the second joint 3. The sealing gasket 6 can be a rubber gasket ring, which plays a sealing role and can also prevent the first end 21 of the first joint 2 from directly and rigidly contacting the first end 31 of the second joint 3, thereby playing a protective role.

[0056] In order to achieve sealing, a first sealing ring 7 is further provided between the movable joint 4 and the second joint 3. The first sealing ring 7 can be a rubber sealing ring, which is sealed between the outer peripheral surface 45 of the movable joint 4 and the circumferential surface 34 of the joint center hole 33. In order to achieve axial positioning of the first sealing ring 7, a positioning groove can be provided on the outer peripheral surface 45 to install the first sealing ring 7. When the movable joint 4 is axially extended and retracted, the first sealing ring 7 slides integrally with the movable joint 4 to maintain sealing.

[0057] In order to achieve sealing, a second sealing ring 8 is also provided on the end surface of the second end 32 of the second joint 3. The second sealing ring 8 can be a rubber sealing ring, which seals between the end surface of the second end 32 and the locking nut 5. In order to achieve the positioning of the second sealing ring 8, a positioning groove can be provided on the end surface of the second end 32 to install the second sealing ring 8.

[0058] In summary, the axially adjustable movable joint provided by the utility model comprises a first locking nut 1, a first joint 2, a second joint 3, a movable joint 4 and a second locking nut 5 which are coaxially arranged. The first locking nut 1 is used to lock the first joint 2 and the second joint 3. The first joint 2 and the movable joint 4 are respectively used to connect the hard pipe. The second joint 3 is used to connect the movable joint 4, and the second locking nut 5 is used to lock the movable joint 4 with the second joint 3. The movable joint 4 is threadedly connected to the second joint 3 and can be axially moved to adjust the length. The movable joint 4 is finally locked by the second locking nut 5. During the axial adjustment of the movable joint 4, there is no cavity structure between it and the second joint 3, so that gas will not be stored, and the resetting of the movable joint 4 will not be damped due to the stored gas. The movable joint 4 is threadedly connected to the second joint 3, and the second joint 3 and the first joint 2 are respectively locked by the first locking nut 1, so the first joint 2 will not be affected during the process of twisting the movable joint 4, which is conducive to maintaining the connection stability between the first joint 2 and the hard pipe.

[0059] In one embodiment, if Figure 1-4 and Figure 8 As shown, the axially adjustable movable joint includes two second locking nuts 5, which are respectively threadedly connected to the movable joint 4, wherein the first second locking nut 5 is locked with the second end 32 of the second joint 3, and the second second locking nut 5 presses the first second locking nut 5.

[0060] In this embodiment, two second locking nuts 5 are arranged on the movable joint 4, and the first second locking nut 5 is pressed by the second second locking nut 5 to prevent the first second locking nut 5 locked with the second joint 3 from loosening, thereby improving the locking effect. If necessary, an elastic gasket 9 can be arranged between the two second locking nuts 5, and when the second second locking nut 5 presses the first second locking nut 5, the elastic gasket 9 is deformed to prevent the second second locking nut 5 from loosening, thereby further improving the locking effect.

[0061] In one embodiment, if Figure 2-3 and Figure 5-6 As shown, the first end 21 of the first joint 2 has a radially protruding joint protrusion ring 25 .

[0062] The first end 11 of the first locking nut 1 has a nut protruding ring 15 protruding toward the nut center hole 13 .

[0063] The joint protrusion ring 25 is located inside the nut protrusion ring 15, and the joint protrusion ring 25 presses the nut protrusion ring 15, and the first end 31 of the second joint 3 presses the joint protrusion ring 25. The sealing gasket 6 is clamped between the joint protrusion ring 25 and the end surface of the first end 31 of the second joint 3.

[0064] In this embodiment, a joint convex ring 25 is provided at the first end 21 of the first joint 2, and the joint convex ring 25 is provided on the circumferential surface of the first end 21 along the radial projection. A nut convex ring 15 is provided at the first end 11 of the first locking nut 1, and the nut convex ring 15 is provided on the hole wall or circumferential surface 14 of the nut center hole 13, and the nut convex ring 15 is radially protruding toward the nut center hole 13. The outer diameter of the joint convex ring 25 is greater than the inner diameter of the nut convex ring 15. During assembly, the second end 22 of the first joint 2 is inserted from the second end 12 of the first locking nut 1, and then the first joint 2 is pushed until the joint convex ring 25 presses the nut convex ring 15. Then, the sealing gasket 6 is placed into the nut center hole 13 from the second end 12 of the first locking nut 1. Then, the first end 31 of the second joint 3 is inserted from the second end 12 of the first locking nut 1, and the second joint 3 is rotated until the first end 31 of the second joint 3 pushes the sealing gasket 6 to press the joint convex ring 25, thereby fixing the first joint 2.

[0065] In one embodiment, the joint protruding ring 25 is integrally formed with the first joint 2, and the nut protruding ring 15 is integrally formed with the first locking nut 1, which is easy to process and has high structural strength.

[0066] If the first locking nut 1 and the first joint 2 are both plastic parts, the joint protruding ring 25 and the first joint 2 are integrally injection molded, and the nut protruding ring 15 and the first locking nut 1 are integrally injection molded. If the first locking nut 1 and the first joint 2 are both metal parts, the joint protruding ring 25 and the first joint 2 are integrally cast or integrally stamped, and the nut protruding ring 15 and the first locking nut 1 are integrally cast or integrally stamped.

[0067] In one embodiment, if Figure 2-3 and Figure 6-7 As shown, a preset distance is provided between the joint protrusion 25 and the end surface of the first end 21 of the first joint 2. The end surface of the first end 31 of the second joint 3 has an annular groove 36, and the first end of the first joint 2 is embedded in the annular groove 36.

[0068] In this embodiment, an annular groove 36 is provided on the end surface of the first end 31 of the second joint 3, which is recessed toward the second end 32, and the joint convex ring 25 is at a certain distance from the end surface of the first end 21 of the first joint 2. During assembly, the first end of the first joint 2 is embedded in the annular groove 36, and position limiting is achieved in the radial and axial directions, respectively, thereby improving the assembly stability of the first joint 2 and the second joint 3.

[0069] In one embodiment, if Figure 2-3 and Figure 7 As shown, the first end 31 of the second joint 3 has a joint retaining ring 37 protruding toward the joint through hole 33 .

[0070] The inner diameter of the joint retaining ring 37 is smaller than the inner diameter of the movable joint 4 .

[0071] When the movable joint 4 is axially shortened to the limit position, the first end 41 of the movable joint 4 presses the joint retaining ring 37 .

[0072] In this embodiment, a joint retaining ring 37 is provided at the first end 31 of the second joint 3. The joint retaining ring 37 is provided on the inner wall or circumferential surface 34 of the joint center hole 33 of the second joint 3. The inner diameter of the joint retaining ring 37 is smaller than the inner diameter of the movable joint 4. The joint retaining ring 37 is used to block the movable joint 4.

[0073] During axial adjustment of the movable joint 4, when it is axially shortened to the limit position, that is, when the movable joint 4 moves toward the first joint 2 to the limit position, the first end 41 of the movable joint 4 presses the joint retaining ring 37 to prevent it from further shortening.

[0074] In one embodiment, if Figure 2-3 As shown, the inner diameter of the joint retaining ring 37 is larger than the inner diameter of the first joint 2 and smaller than the outer diameter of the first joint 2, so as to prevent the joint retaining ring 37 from blocking the flow of the medium.

[0075] In one embodiment, the joint retaining ring 37 is integrally formed with the second joint 3, which is convenient for processing and molding and has high structural strength.

[0076] If the second joint 3 is a plastic part, the joint retaining ring 37 and the second joint 3 are integrally injection molded. If the second joint 3 is a metal part, the joint retaining ring 37 and the second joint 3 are integrally cast or stamped.

[0077] In one embodiment, if Figure 2-3 and Figure 8 As shown, a plurality of first sealing rings 7 are provided at intervals between the movable joint 4 and the second joint 33, so as to achieve a better sealing effect.

[0078] In one embodiment, if Figure 2-3 and Figure 8 As shown, the first sealing ring 7 is connected to the circumferential surface of the first end 41 of the movable joint 4. When the movable joint 4 extends to the outside of the second joint 3, the first sealing ring 7 arranged on the first end 41 of the movable joint 4 will not slide out of the second joint 3, and the sealing effect is always maintained.

[0079] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0080] The above are only the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, on the basis of the principles of the present invention, several other modifications can be made, which should also be considered as the protection scope of the present invention.

Claims

1. An axially adjustable movable joint, characterized in that: It includes a first locking nut, a first joint, a second joint, a movable joint and a second locking nut; The first end of the first connector is connected to the first locking nut, and the second end of the first connector extends out of the first locking nut; The first end of the second connector is threadedly connected to the first locking nut and presses the first end of the first connector, and the second end of the second connector extends out of the outside of the first locking nut; The first end of the movable joint is threadedly connected to the second joint, and the second end of the movable joint extends out of the outside of the second joint; The second locking nut is threadedly connected to the movable joint and locked on one side of the second end of the second joint; A sealing gasket is provided between the first end of the first joint and the first end of the second joint, a first sealing ring is provided between the movable joint and the second joint, and a second sealing ring is provided on the end surface of the second end of the second joint.

2. The axially adjustable movable joint according to claim 1, characterized in that: It includes two second locking nuts, which are respectively threadedly connected to the movable joint, wherein the first second locking nut is locked with the second end of the second joint, and the second second locking nut presses the first second locking nut.

3. The axially adjustable movable joint according to claim 1, characterized in that: The first end of the first joint has a radially protruding joint protruding ring; The first end of the first locking nut has a nut protruding ring protruding toward the central hole of the nut; The joint convex ring is located inside the nut convex ring, and the joint convex ring presses the nut convex ring, and the first end of the second joint presses the joint convex ring; The sealing gasket is clamped between the joint convex ring and the end surface of the first end of the second joint.

4. The axially adjustable movable joint according to claim 3, characterized in that: The joint protruding ring is integrally formed with the first joint, and the nut protruding ring is integrally formed with the first locking nut.

5. The axially adjustable movable joint according to claim 3, characterized in that: A preset distance is provided between the joint convex ring and the end surface of the first end of the first joint; The end surface of the first end of the second joint has an annular groove, and the first end of the first joint is embedded in the annular groove.

6. The axially adjustable movable joint according to claim 1, characterized in that: The first end of the second joint has a joint retaining ring protruding toward the joint through hole; The inner diameter of the joint retaining ring is smaller than the inner diameter of the movable joint; When the movable joint is axially shortened to a limit position, the first end of the movable joint presses the joint retaining ring.

7. The axially adjustable movable joint according to claim 6, characterized in that: The inner diameter of the joint retaining ring is larger than the inner diameter of the first joint and smaller than the outer diameter of the first joint.

8. The axially adjustable movable joint according to claim 6, characterized in that: The joint retaining ring is integrally formed with the second joint.

9. The axially adjustable movable joint according to claim 1, characterized in that: A plurality of first sealing rings are arranged at intervals between the movable joint and the second joint.

10. The axially adjustable movable joint according to claim 1, characterized in that: The first sealing ring is connected to the circumferential surface of the first end of the movable joint.

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