A locking pipe joint

Abstract

The utility model discloses a kind of anti-loose pipe joints, comprising: internal thread joint, set screw, external thread joint;External thread joint right side threaded end sleeve is connected in internal thread joint left side screw hole, set screw threaded end sleeve is connected in the screw hole of internal thread joint left side through hole outer hexagonal, set screw bottom conical end abuts against external thread joint thread left side limiting inclined step;Internal thread joint right end outer connection pipeline, external thread joint left end outer connection pipeline.The utility model's internal thread joint, set screw, external thread joint three same rotation direction, when internal thread joint and external thread joint loosen will drive set screw reverse rotation, tighten set screw, prevent loosening;Set screw can play the effect similar to nylon pin shock absorption, can effectively bear impact load;Anti-loose, shock absorption effect is both good.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic and gas pressure and water supply technology, specifically to a pipe connector. Background Technology

[0002] Currently, most pipe fittings are internal and external threaded joints. When tightening the threaded connection, elastic deformation and assembly clearance can cause lateral clearance. In hydraulic and pneumatic systems and water supply systems, especially in hydraulic and pneumatic systems, impact loads are frequently encountered. Due to the thread helix angle and lateral clearance, pipe fittings are prone to loosening, which can cause accidents, especially in high-pressure hydraulic and pneumatic systems and high-pressure water supply systems. Therefore, preventing loosening of pipe fittings plays a crucial role in the normal operation of hydraulic and pneumatic systems and water supply systems.

[0003] Existing anti-loosening methods for pipe threads are divided into permanent anti-loosening and mechanical anti-loosening. Permanent anti-loosening is difficult to disassemble; mechanical anti-loosening usually adopts ferrule type, set screw type, expansion thread type and internal expansion mandrel type; ferrule type structure often cannot completely eliminate transverse clearance, and under impact load, the clearance is prone to loosening, causing leakage; expansion thread type and internal expansion mandrel type offset the effect of transverse clearance by compressing and deforming the thread, but the compression amount is small, the preload is small, and the anti-loosening effect is poor. Large compression amount will cause plastic deformation and damage to the thread; set screw type uses set screw to compress the thread to deform and achieve tightening, but it has the same problems, and set screws cannot be used at the sealing pipe thread. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model introduces an anti-loosening pipe joint with good anti-loosening effect and shock absorption effect.

[0005] The specific solution of this utility model is as follows: A non-loosening pipe joint includes: an internal threaded joint, a set screw, and an external threaded joint; the right threaded end of the external threaded joint is sleeved in the left threaded hole of the internal threaded joint, the threaded end of the set screw is sleeved in the threaded hole at the hexagonal position of the left through hole of the internal threaded joint, and the bottom conical end of the set screw abuts against the left limiting inclined step of the external threaded joint; the right end of the internal threaded joint is connected to the external pipeline, and the left end of the external threaded joint is connected to the external pipeline.

[0006] The internal threaded connector has a through hole on the left, a screw hole in the middle, and a step on the right. The right end of the step is connected to a pipeline. The center of the step has a through hole connecting to the pipeline. The outer side is a regular hexagon. There are six screw holes for installing set screws at the through hole on the left side of the regular hexagon. The positions of the six screw holes are matched with the limiting inclined step of the external threaded connector.

[0007] The set screw has an interference thread at the thread end and a tapered end at the bottom that matches the limiting step of the external thread connector; the material is glass fiber filled nylon; and there are six of them.

[0008] The external threaded connector has an external thread end on the right side and a limiting inclined step on the left side. There is a relief groove on the left side of the limiting inclined step and a regular hexagonal step on the left side of the relief groove. The left end of the regular hexagonal step is connected to a pipeline, and there is a through hole in the center of the external threaded connector connecting to the pipeline. The outer diameter of the relief groove is greater than or equal to the minor diameter of the thread, and the angle between the limiting inclined step and the relief groove is 20°–30°.

[0009] The internal threaded connector, set screw, and external threaded connector all have the same rotation direction.

[0010] This utility model has the following technical effects: This invention can effectively eliminate lateral clearance: after the internal threaded joint and the external threaded joint are tightened, the set screw is tightened, and the bottom conical end of the set screw abuts against the limiting inclined step of the external threaded joint, eliminating the fit clearance; the lateral clearance can no longer cause loosening.

[0011] This invention has a good anti-loosening effect: the tapered end of the set screw abuts against the limiting inclined step of the external threaded connector, and the friction pair between the two is similar to a friction wheel. The internal threaded connector, the set screw, and the external threaded connector all have the same rotation direction. When the internal threaded connector and the external threaded connector become loose, they will drive the set screw to rotate in the opposite direction, making the set screw tighter and preventing the internal threaded connector and the external threaded connector from becoming loose. The set screw is made of glass fiber filled nylon, which takes into account both elasticity and rigidity, and can increase the thread interference to improve the anti-loosening performance.

[0012] This invention can increase the preload: the tapered end of the set screw abuts against the inclined step of the external threaded connector without damaging the thread; the set screw is made of glass fiber filled nylon, which has a lower hardness than steel, copper alloy, aluminum alloy, engineering plastic and other commonly used materials for pipe fittings, and a higher elasticity than the above materials. Appropriately increasing the extrusion amount will not damage the internal and external threaded connectors; it can effectively increase the preload.

[0013] This invention provides high load-bearing capacity for pipe fittings: the outer diameter of the relief groove in the external threaded fitting is greater than or equal to the minor diameter of the thread, and the wall thickness at the relief groove position is not less than the wall thickness at the minor diameter position, avoiding dangerous cross-sections and ensuring the load-bearing capacity of the relief groove; the angle between the limiting inclined step of the external threaded fitting and the relief groove is 20°-30°, and the bottom conical end of the set screw abuts against the limiting inclined step of the external threaded fitting, which can decompose stress through the inclined surface, and the axial compressive force borne by the set screw is greater than the radial shear force, resulting in good force distribution effect; the threaded end of the set screw is sleeved in the hexagonal threaded hole at the threaded end of the internal threaded fitting, and the six annular supports are more evenly stressed; thus, it can effectively improve the load-bearing capacity of the pipe fitting.

[0014] This invention has good shock absorption: the tapered end of the set screw abuts against the inclined step of the external threaded joint, which can achieve a shock absorption effect similar to that of a nylon pin (such as a nylon pin elastic coupling), and can effectively bear the impact loads that often occur in hydraulic and pneumatic systems and water supply systems, especially in hydraulic and pneumatic systems. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the internal threaded connector structure of this utility model (BB sectional view). Figure 3 This is a left-side schematic diagram (AA sectional view) of the internal threaded connector of this utility model. Figure 4 This is a schematic diagram (CC sectional view) of the external threaded connector structure of this utility model. Figure 5 This is a right-side view of the external threaded connector of this utility model. Detailed Implementation

[0016] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, an anti-loosening pipe joint includes: an internal threaded joint 1, a set screw 2, and an external threaded joint 3; the right threaded end of the external threaded joint 3 is sleeved in the left threaded hole of the internal threaded joint 1, and the threaded end of the set screw 2 is sleeved in the hexagonal threaded hole on the left side of the through hole of the internal threaded joint 1; the bottom conical end of the set screw 2 abuts against the left limiting inclined step of the thread of the external threaded joint 3; the right end of the internal threaded joint 1 is connected to a pipeline, and the left end of the external threaded joint 3 is connected to a pipeline.

[0017] The internal threaded connector 1 has a through hole on the left, a screw hole in the middle, and a step on the right. The right end of the step is connected to a pipeline. The center of the step has a through hole connecting to the pipeline. The outer side is a regular hexagon. There are six screw holes for installing set screws at the through hole on the left side of the regular hexagon. The positions of the six screw holes are matched with the limiting inclined step of the external threaded connector 3.

[0018] The set screw 2 has an interference thread at the threaded end and a tapered end at the bottom that matches the limiting inclined step of the external thread connector 3; the material is glass fiber filled nylon; and there are six of them.

[0019] The external threaded connector 3 has an external thread end on the right side and a limiting inclined step on the left side. There is a relief groove on the left side of the limiting inclined step and a regular hexagonal step on the left side of the relief groove. The left end of the regular hexagonal step is connected to a pipeline. There is a through hole in the center of the external threaded connector 3 that connects to the pipeline. The outer diameter of the relief groove is greater than or equal to the minor diameter of the thread, and the angle between the limiting inclined step and the relief groove is 20°–30°.

[0020] The internal threaded connector 1, the set screw 2, and the external threaded connector 3 all have the same rotation direction.

Claims

1. A non-loosening pipe fitting, comprising: An internal threaded connector, a set screw, and an external threaded connector; the right threaded end of the external threaded connector is fitted into the left threaded hole of the internal threaded connector, the right end of the internal threaded connector is connected to an external pipeline, and the left end of the external threaded connector is connected to an external pipeline; characterized in that: the threaded end of the set screw is fitted into the threaded hole at the hexagonal location of the through hole on the left side of the internal threaded connector, and the bottom conical end of the set screw abuts against the left limiting inclined step of the external threaded connector.

2. The anti-loosening pipe joint according to claim 1, characterized in that: The internal threaded connector has a through hole on the left, a screw hole in the middle, a step on the right, and a regular hexagon on the outside of the step. There are six screw holes for installing set screws at the through hole on the left side of the regular hexagon. The positions of the six screw holes are matched with the limiting inclined step of the external threaded connector.

3. A non-loosening pipe joint according to claim 1 or 2, characterized in that: The bottom of the set screw has a tapered end that matches the limiting inclined step of the external threaded connector.

4. The anti-loosening pipe joint according to claim 3, characterized in that: The right side of the external threaded connector is the external thread end, and the left side of the external thread end is a limiting inclined step. There is a relief groove on the left side of the limiting inclined step. The outer diameter of the relief groove is greater than or equal to the minor diameter of the thread. The included angle between the limiting inclined step and the relief groove is 20°-30°.

5. A non-loosening pipe joint according to claim 1 or 2, characterized in that: The internal threaded connector, set screw, and external threaded connector all have the same rotation direction.

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