Single channel bidirectional rotary connector

Abstract

The present invention relates to a single-channel bidirectional rotary connector, comprising a first end, a second end, and a locking nut. The first end and the second end are sleeved and locked with the locking nut. After the outer surface of the first end is matched with the inner surface of the second end, the contact surface between the first end and the locking nut is provided with a first sealing element, a first bearing, a thrust bearing, a stopper, a plurality of groups of parallel rotary sealing elements, and a second bearing in sequence. The first sealing element, the first bearing, and the thrust bearing are provided on the contact surface between the first end and the locking nut, and the stopper, the rotary sealing element, and the second bearing are provided on the contact surface between the locking nut and the inner surface of the second end. A flow reducing sleeve is provided inside the second end, and a second sealing element is provided on the step surface between the flow reducing sleeve and the second end. The rotary connector has a simple structure, has no leakage when used statically or at high speed, has no direction restriction for installation and use, has good sealing performance, is resistant to high pressure and high temperature, has high load strength, and has a long service life.

Description

Technical Field

[0001] The invention belongs to the technical field of connectors, and in particular relates to a single-channel bidirectional rotary connector. Background Art

[0002] A rotary connector is a transition device used to introduce oil or gas into a high-speed rotating mechanism, and to control and distribute the oil or gas in the rotating mechanism. In order to ensure the stability of the internal pressure of the rotary connector and the efficiency of the oil or gas introduction, it is necessary to prevent internal leakage in the rotary connector. Rotary connectors are used in various mechanical arms, and are commonly used at the tail of cranes and loaders.

[0003] Chinese utility model patent CN 209469916U provides a single-channel rotary joint, in which a rotary valve is arranged as an extension end, a mounting end and a sealing section, and the sealing section cooperates with a rotary shaft seal to improve its sealing performance; however, this type of rotary joint is used in a single channel with limited direction, and in actual use, due to the problem of excessive flow in the oil circuit or gas circuit, there is a situation in which the oil circuit or gas circuit refluxes and moves in the opposite direction, and its sealing performance is poor and the application range is narrow; the overall force strength of the rotary joint is low, and it cannot operate under high load intensity. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in view of the above-mentioned defects, the present invention provides a single-channel bidirectional rotary connector with a simple structure, no leakage when used statically or in high-speed rotation, no directional restrictions on installation and use, good sealing, high pressure and high temperature resistance, high load strength and long service life.

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows: a single-channel bidirectional rotary connector comprises a first end, a second end, and a locking nut, wherein the first end and the second end are sleeved and locked with the locking nut;

[0006] The outer surface of the first end portion is matched with the inner surface of the second end portion, and the contact surface between the first end portion and the locking nut is provided with a first sealing element, a first bearing, a thrust bearing, a stopper, a plurality of sets of parallel rotating sealing elements, and a second bearing in sequence. The first sealing element, the first bearing, and the thrust bearing are provided on the contact surface between the first end portion and the locking nut, and the stopper, the rotating sealing element, and the second bearing are provided on the contact surface between the locking nut and the inner surface of the second end portion.

[0007] A flow reducing sleeve is arranged inside the second end, and a second sealing element is arranged between the flow reducing sleeve and the step surface inside the second end; the flow reducing sleeve is arranged between the inner surfaces contacting the first end and the second end.

[0008] This single-channel bidirectional rotary connector forms a shell with a cavity through the first end and the second end for the air supply or oil passage, and can be rotated 360 degrees after being engaged by a locking nut, and has a wide range of uses; the second sealing element improves the sealing performance between the flow reduction sleeve, the first end and the second end, and effectively reduces the occurrence of oil or air leakage; the first bearing, the second bearing and the thrust bearing introduced not only meet the requirements of rotational load, radial and axial force when the crane or loader is used in a rotating state, but also serve as a blocking and connecting piece to prevent oil or air leakage; the introduced rotary sealing element, as another important The blocking member increases the connection contact area between the first end and the second end, and the rotating sealing element contacts the first end and the second end, and has the function of bidirectional sealing of the rotary connector; the introduced stopper has both sealing performance and can disperse the force exerted on the first end, the second end and the thrust bearing under high-speed motion state, effectively preventing the rotary connector from deforming; the formed rotary connector has good pressure resistance, large gas or oil flow under the same conditions, good sealing performance, high stability, high load strength, long service life, no leakage when used statically or at high speed, and no directional restriction on installation and use.

[0009] Furthermore, the stopper is arranged on the outer surface of the first end portion and contacts the edge of the second end portion, and the stopper is also connected to the thrust bearing.

[0010] Furthermore, the block is an arc block, and the arc block corresponds to a circumferential angle of 90°-180°; a plurality of arc blocks form a complete arc ring. The complete arc ring is composed of a plurality of dispersed arc blocks, and when the first end, the second end and the thrust bearing are subjected to forces that squeeze the block, the block can move along its installation cavity, converting the squeezing force into thrust for the movement of the block, further improving the anti-deformation capability and prolonging the service life.

[0011] Furthermore, the circumferential angle corresponding to the stopper is 120°, and the three stoppers have the same structure. The same stopper structure is adopted, which is convenient for processing, and the three stoppers are evenly stressed, thereby reducing the failure rate caused by the deformation of the stoppers.

[0012] Further, the first end portion comprises a first shell and a first cavity arranged inside the first shell, the outer surface of the first shell is provided with a first outer stepped shaft, a second outer stepped shaft, a third outer stepped shaft, a fourth outer stepped shaft and an arc-shaped groove in sequence from the side end portion of the first end portion inward, the shoulder height of the second outer stepped shaft is greater than that of the first outer stepped shaft and the third outer stepped shaft, and the shoulder height of the fourth outer stepped shaft is greater than that of the second outer stepped shaft; the first outer stepped shaft, the second outer stepped shaft, the third outer stepped shaft and the fourth outer stepped shaft form a whole; the first outer stepped shaft, the second outer stepped shaft, the third outer stepped shaft, the fourth outer stepped shaft and the arc-shaped groove are all arranged in an annular shape; the first sealing element is arranged in the arc-shaped groove, the first bearing is arranged on the outer surface of the fourth outer stepped shaft close to the arc-shaped groove, a thrust bearing is arranged on the other side of the fourth outer stepped shaft, the stopper is arranged on the third outer stepped shaft, a plurality of rotating sealing elements are arranged on the surface of the second outer stepped shaft, and the second bearing is arranged on the first outer stepped shaft;

[0013] The second end portion comprises a second shell and a second cavity arranged inside the second shell, the second shell having an inner surface of the cavity, and a first inner gradient annular groove, a second inner gradient annular groove, a third inner gradient annular groove, and a fourth inner gradient annular groove are sequentially arranged inward from the second shell toward the side end portion of the first shell, the first inner gradient annular groove, the second inner gradient annular groove, the third inner gradient annular groove, and the fourth inner gradient annular groove form a whole; the depressions of the first inner gradient annular groove, the second inner gradient annular groove, the third inner gradient annular groove, and the fourth inner gradient annular groove decrease in sequence; a plurality of embedded grooves for installing rotating sealing elements are arranged in the second inner gradient annular groove, the other side of the stopper is connected to the surface of the first inner gradient annular groove, the second bearing is connected to the surface of the third inner gradient annular groove, the flow reducing sleeve fits the fourth inner gradient annular groove and the surface of the second cavity, and the second sealing element is arranged at the contact portion between the flow reducing sleeve and the second shell;

[0014] The locking nut comprises a nut housing and a defined cavity arranged inside the nut housing, and the defined cavity is in close contact with the first sealing element, the first bearing, the thrust bearing, and the outer surface of the second housing.

[0015] Furthermore, the distance between the second sealing element and the central axis of the first cavity and the second cavity after mating is not greater than the distance between the outer end face of the second bearing and the central axis; the distance between the outer end of the rotating sealing element and the central axis is not less than the distance between the outer end face of the second bearing and the central axis; the distance between the outer end of the stopper and the central axis is not less than the distance between the outer end of the rotating sealing element and the central axis; the distance between the outer end of the thrust bearing and the central axis is not less than the distance between the outer end of the stopper and the central axis. The distance between the contact piece and the central axis between the first end and the second end is limited to form a gradient difference, which further improves the sealing performance.

[0016] Furthermore, there is at least one rotating sealing element.

[0017] Furthermore, a pair of first reinforcing plates are provided on the outer surface of the first shell, the shape of the first reinforcing plates is the same as that of the first shell, and the ends of the first reinforcing plates do not exceed the edge of the fifth outer stepped shaft;

[0018] The outer surface of the second shell is provided with a pair of second reinforcing plates, and the second reinforcing plates have the same shape as the second shell. The first reinforcing plates and the second reinforcing plates introduced are convenient for assembling the first end and the second end, have a positioning function during use, and can also improve the pressure resistance of the first shell and the second shell, and improve their service life.

[0019] Furthermore, the outer surface of the nut shell has a first platform and a second platform, and the first platform and the second platform are symmetrically arranged about the central axis of the nut shell. The first platform and the second platform introduced have beautiful structure, are convenient for positioning during installation and locking, and are easy to use.

[0020] Furthermore, the flow reducing sleeve comprises a flow reducing shell and a flow reducing cavity arranged inside the flow reducing shell, wherein the diameter of the flow reducing cavity is smaller than the diameter of the first cavity and the second cavity; the flow reducing cavity also has a first transition cavity on the side in contact with the first cavity, and a second transition cavity is arranged between the flow reducing cavity and the second cavity, and the first transition cavity and the second transition cavity are a step structure. The flow reducing sleeve introduces the first transition cavity and the second transition cavity of the step structure, which has a drainage and guiding function, reduces the possibility of the gas or oil conveyed in the cavity overflowing from the second end and the interface of the flow reducing sleeve, further improves the sealing performance, and reduces the probability of oil or gas leakage.

[0021] The beneficial effects of the present invention are:

[0022] 1. This single-channel bidirectional rotary connector forms a shell with a cavity through the first end and the second end for the air supply or oil passage; the second sealing element improves the sealing performance between the flow reduction sleeve, the first end and the second end, effectively reducing the occurrence of oil or gas leakage; the first bearing, the second bearing and the thrust bearing introduced not only meet the requirements of rotational load, radial and axial force when the crane or loader is used in a rotating state, but also serve as a blocking and connecting member to prevent oil or gas leakage; the introduced rotary sealing element, as another heavy blocking member, increases the first end The connection contact area between the first end and the second end, and the rotating sealing element contacts the first end and the second end, and has the function of bidirectional sealing of the rotary connector; the introduced block has both sealing performance and can disperse the forces acting on the first end, the second end and the thrust bearing under high-speed motion state, effectively preventing the rotary connector from deforming; the formed rotary connector has good pressure resistance, large gas or oil flow under the same conditions, good sealing performance, high stability, high load strength, long service life, no leakage when used statically or at high speed, and no directional restriction on installation and use.

[0023] 2. The complete arc ring is composed of a number of dispersed arc blocks. When the first end, the second end and the thrust bearing are subjected to the force to squeeze the block, the block can move along its installation cavity, converting the squeezing force into the block movement thrust, further improving the anti-deformation ability and extending the service life; the same block structure is used, which is convenient for processing, and the three blocks are evenly stressed, reducing the failure rate caused by block deformation.

[0024] 3. The distance between the contact piece and the central axis between the first end and the second end is limited to form a gradient difference, thereby further improving the sealing performance.

[0025] 4. The first reinforcing plate and the second reinforcing plate introduced on the first end and the second end facilitate the assembly of the first end and the second end, have a positioning function during use, and can also improve the compressive strength of the first shell and the second shell and increase their service life; the first platform and the second platform introduced on the locking nut have beautiful structure, are convenient for positioning during installation and locking, and are easy to use.

[0026] 5. The flow reducing sleeve is introduced into the first transition cavity and the second transition cavity of the step structure, which has a drainage and guiding function, reducing the possibility of the gas or oil transported in the cavity overflowing from the interface between the second end and the flow reducing sleeve, further improving the sealing performance and reducing the probability of oil or gas leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.

[0028] Figure 1It is a schematic diagram of the cross-sectional structure of the present invention;

[0029] Figure 2 This is a top view of the structure of the first end of the present invention;

[0030] Figure 3 for Figure 2 Schematic diagram of the cross-section structure along AA;

[0031] Figure 4 It is a schematic diagram of the three-dimensional structure of the first end portion of the present invention;

[0032] Figure 5 It is a schematic diagram of the top view structure of the second end of the present invention;

[0033] Figure 6 for Figure 5 Schematic diagram of the cross-section structure along BB;

[0034] Figure 7 It is a schematic diagram of the three-dimensional structure of the second end portion of the present invention;

[0035] Figure 8 This is a structural view of the locking nut of the present invention;

[0036] Fig. 9 for Figure 8 Schematic diagram of the structure along CC section;

[0037] Fig.10 It is a schematic diagram of the three-dimensional structure of the locking nut of the present invention;

[0038] Fig.11 This is a schematic diagram of the cross-sectional structure of the flow reducing sleeve of the present invention;

[0039] Fig.12 It is a schematic diagram of the three-dimensional structure of the stopper of the present invention;

[0040] Wherein: 1 is a locking nut, 1a is a nut housing, 1b is a limited cavity, 1c is a first platform, 1d is a second platform, 2 is a first end, 21 is a first housing, 22 is a first cavity, 23 is a first outer stepped shaft, 24 is a second outer stepped shaft, 25 is a third outer stepped shaft, 26 is a fourth outer stepped shaft, 27 is an arc groove, 28 is a first reinforcing plate, 3 is a second end, 31 is a second housing, 32 is a second cavity, 33 is a first inner gradient annular groove, 34 is a second inner gradient annular groove, 35 is a third inner gradient annular groove, 36 is a fourth inner gradient annular groove, 37 is an embedded groove, 38 is a second reinforcing plate, 4 is a flow reduction sleeve, 41 is a flow reduction housing, 42 is a flow reduction cavity, 43 is a first transition cavity, 44 is a second transition cavity, 5 is a stopper, 6 is a first bearing, 7 is a thrust bearing, 8 is a second bearing, 9 is a first sealing element, 10 is a rotating sealing element, and 11 is a second sealing element. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0042] Reference Figure 1 , a single-channel bidirectional rotary connector, comprising a first end 2, a second end 3, a locking nut 1, and a stopper 5, wherein the first end 2 and the second end 3 are provided with the stopper 5, and are locked by connecting with the locking nut 1;

[0043] After the outer surface of the first end 2 is matched with the inner surface of the second end 3, the contact surface between the locking nut 1 is provided with a first sealing element 9, a first bearing 6, a thrust bearing 7, a stopper 5, several groups of parallel rotating sealing elements 10, and a second bearing 8 in sequence. The first sealing element 9, the first bearing 6, and the thrust bearing 7 are arranged on the contact surface between the first end 2 and the locking nut 1, the stopper 5, the rotating sealing element 10 and the second bearing 8 are arranged on the contact surface between the locking nut 1 and the inner surface of the second end 3, a flow reducing sleeve 4 is arranged inside the second end 3, and a second sealing element 11 is arranged on the step surface of the flow reducing sleeve 4 and the second end 3; the flow reducing sleeve 4 is arranged between the inner surfaces of the first end 2 and the second end 3 in contact, the stopper 5 is arranged on the outer surface of the first end 2 and in contact with the edge of the second end 3, and the stopper 5 is also connected to the thrust bearing 7.

[0044] Reference Figure 2 — Figure 4The first end portion 2 includes a first shell 21 and a first cavity 22 arranged inside the first shell 21. The outer surface of the first shell 21 is provided with a first outer stepped shaft 23, a second outer stepped shaft 24, a third outer stepped shaft 25, a fourth outer stepped shaft 26 and an arc-shaped groove 27 in sequence from the side end of the first end portion 2 inward. The shoulder height of the second outer stepped shaft 24 is greater than that of the first outer stepped shaft 23 and the third outer stepped shaft 25. The shoulder height of the fourth outer stepped shaft 26 is greater than that of the second outer stepped shaft 24. The first outer stepped shaft 23, the second outer stepped shaft 24, the third outer stepped shaft 25 and the fourth outer stepped shaft 26 form a whole. The first outer stepped shaft 23, the second outer stepped shaft 24, the third outer stepped shaft 25 and the fourth outer stepped shaft 26 form a whole. The third outer stepped shaft 25, the fourth outer stepped shaft 26 and the arc groove 27 are all arranged in an annular shape; the first sealing element 9 is arranged in the arc groove 27, the first bearing 6 is arranged on the outer surface of the fourth outer stepped shaft 26 close to the arc groove 27, and the thrust bearing 7 is arranged on the other side of the fourth outer stepped shaft 26, the stopper 5 is arranged on the third outer stepped shaft 25, and a plurality of rotating sealing elements 10 are arranged on the surface of the second outer stepped shaft 24, and the second bearing 8 is arranged on the first outer stepped shaft 23; a pair of first reinforcing plates 28 are arranged on the outer surface of the first shell 21, and the shape of the first reinforcing plate 28 is the same as that of the first shell 21, and the end of the first reinforcing plate 28 does not exceed the edge of the fifth outer stepped shaft.

[0045] Reference Figure 5 — Figure 7 The second end portion 3 includes a second shell 31 and a second cavity 32 arranged inside the second shell 31. The second shell 31 has an inner surface of a cavity, and a first inner gradient annular groove 33, a second inner gradient annular groove 34, a third inner gradient annular groove 35, and a fourth inner gradient annular groove 36 are sequentially arranged inward from the second shell 31 toward the side end of the first shell 21. The first inner gradient annular groove 33, the second inner gradient annular groove 34, the third inner gradient annular groove 35, and the fourth inner gradient annular groove 36 form a whole; the first inner gradient annular groove 33, the second inner gradient annular groove 34, the third inner gradient annular groove 35, and the fourth inner gradient annular groove 36 form a whole; the first inner gradient annular groove 33, the second inner gradient annular groove 34, the third inner gradient annular groove 35. The concavity of the fourth inner gradient annular groove 36 decreases successively; a plurality of embedded grooves 37 for installing the rotating sealing element 10 are provided in the second inner gradient annular groove 34; the other side of the stopper 5 is connected to the surface of the first inner gradient annular groove 33; the second bearing 8 is connected to the surface of the third inner gradient annular groove 35; the flow reducing sleeve 4 fits the surface of the fourth inner gradient annular groove 36 and the second cavity 32; the second sealing element 11 is arranged at the contact portion between the flow reducing sleeve 4 and the second shell 31; a pair of second reinforcing plates 38 are provided on the outer surface of the second shell 31; the shape of the second reinforcing plates 38 is the same as that of the second shell 31.

[0046] Reference Figure 8-Figure 10The locking nut 1 includes a nut shell 1a and a defined cavity 1b arranged inside the nut shell 1a, and the defined cavity 1b is in close contact with the outer surface of the first sealing element 9, the first bearing 6, the thrust bearing 7, and the second shell 31; the outer surface of the nut shell 1a has a first platform 1c and a first platform 1d, and the first platform 1c and the first platform 1d are symmetrically arranged about the central axis of the nut shell 1a.

[0047] Reference Fig.11 The flow reducing sleeve 4 includes a flow reducing shell 41 and a flow reducing cavity 42 arranged inside the flow reducing shell 41, and the diameter of the flow reducing cavity 42 is smaller than the diameters of the first cavity 22 and the second cavity 32; the flow reducing cavity 42 also has a first transition cavity 43 on the side in contact with the first cavity, and a second transition cavity 44 is provided between the flow reducing cavity 42 and the second cavity, and the first transition cavity 43 and the second transition cavity 44 are step structures.

[0048] Reference Fig.12 The stopper 5 is an arc-shaped stopper 5, and the corresponding circular angle of the arc-shaped stopper 5 is 90°-180°; a plurality of arc-shaped stoppers 5 form a complete arc-shaped ring. As a preferred example of this embodiment, the corresponding circular angle of the stopper 5 is 120°, that is, three stoppers 5 have the same structure, and three stoppers 5 with a circular angle of 120° form a movable arc-shaped ring.

[0049] Continue to refer to Figure 1 The distance between the second sealing element 11 and the central axis where the first cavity 22 and the second cavity 32 coincide after mating is not greater than the distance between the outer end face of the second bearing 8 and the central axis; the distance between the outer end of the rotating sealing element 10 and the central axis is not less than the distance between the outer end face of the second bearing 8 and the central axis; the distance between the outer end of the stopper 5 and the central axis is not less than the distance between the outer end of the rotating sealing element 10 and the central axis; the distance between the outer end of the thrust bearing 7 and the central axis is not less than the distance between the outer end of the stopper 5 and the central axis.

[0050] The number of the rotating sealing element 10 is at least one. In this embodiment, two rotating sealing elements 10 are used, which not only improves the flexibility of rotation but also forms two layers of sealing barriers with good sealing performance.

[0051] In the specific implementation process, the first shell 21 and the second shell 31 are set according to the setting direction of the connected parts. The first shell 21 and the second shell 31 can be straight rods or bent structures with an angle. In this embodiment, the first shell 21 and the second shell 31 are both L-shaped structures with an angle of 90°.

[0052] The single-channel bidirectional rotary connector forms a shell with a cavity through the first end and the second end for the air supply or oil passage; the second sealing element improves the sealing performance between the flow reduction sleeve, the first end and the second end, effectively reducing the occurrence of oil or gas leakage; the first bearing, the second bearing and the thrust bearing introduced not only meet the requirements of rotational load, radial and axial force when the crane or loader is used in a rotating state, but also serve as a blocking and connecting member to prevent oil or gas leakage; the introduced rotary sealing element, as another heavy blocking member, increases the sealing performance between the first end and the second end. The rotary sealing element contacts the first end and the second end, and has the function of bidirectional sealing of the rotary connector; the introduced block has both sealing performance and can disperse the force exerted on the first end, the second end and the thrust bearing under high-speed motion, thereby effectively preventing the rotary connector from deforming; the rotary connector has good pressure resistance, which can withstand up to 35MPa. Under the same conditions, the gas circuit or the oil circuit can pass a large flow, has good sealing performance, high stability, high load strength, and long service life. There is no leakage when used statically or at high speed, and there is no directional restriction on installation and use.

[0053] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. Single-channel bidirectional rotary connector, characterized by: It comprises a first end, a second end and a locking nut, wherein the first end and the second end are sleeved and locked by contacting with the locking nut; The outer surface of the first end is provided with a first sealing element, a first bearing, a thrust bearing, a stopper, a plurality of sets of parallel rotating sealing elements, and a second bearing in sequence, wherein the first sealing element, the first bearing, and the thrust bearing are arranged on the contact surface between the first end and the locking nut, and the stopper, the rotating sealing element, and the second bearing are arranged on the contact surface between the outer surface of the first end and the inner surface of the second end; A flow reducing sleeve is provided inside the second end portion, and a second sealing element is provided between the flow reducing sleeve and the step surface inside the second end portion; the flow reducing sleeve is arranged between the right end side of the first end portion and the step surface inside the second end portion; The stopper is an arc-shaped stopper, and the arc-shaped stopper corresponds to a circumferential angle of 90°-180°; a plurality of arc-shaped stoppers form a complete arc-shaped ring; The first end portion comprises a first shell and a first cavity arranged inside the first shell, the outer surface of the first shell is provided with a first outer stepped shaft, a second outer stepped shaft, a third outer stepped shaft, a fourth outer stepped shaft and an arc-shaped groove in sequence from the side end portion of the first end portion inward, the shoulder height of the second outer stepped shaft is greater than that of the first outer stepped shaft and the third outer stepped shaft, and the shoulder height of the fourth outer stepped shaft is greater than that of the second outer stepped shaft; the first outer stepped shaft, the second outer stepped shaft, the third outer stepped shaft and the fourth outer stepped shaft form a whole; the first outer stepped shaft, the second outer stepped shaft, the third outer stepped shaft, the fourth outer stepped shaft and the arc-shaped groove are all annularly arranged; the first sealing element is arranged in the arc-shaped groove, the first bearing is arranged on the outer surface of the fourth outer stepped shaft close to the arc-shaped groove, a thrust bearing is arranged on the other side of the fourth outer stepped shaft, the stopper is arranged on the third outer stepped shaft, a plurality of rotating sealing elements are arranged on the surface of the second outer stepped shaft, and the second bearing is arranged on the first outer stepped shaft; The second end portion comprises a second shell and a second cavity arranged inside the second shell, the second shell having an inner surface of the cavity, and a first inner gradient annular groove, a second inner gradient annular groove, a third inner gradient annular groove, and a fourth inner gradient annular groove are sequentially arranged inward from the second shell toward the side end portion of the first shell, the first inner gradient annular groove, the second inner gradient annular groove, the third inner gradient annular groove, and the fourth inner gradient annular groove form a whole; the depressions of the first inner gradient annular groove, the second inner gradient annular groove, the third inner gradient annular groove, and the fourth inner gradient annular groove decrease in sequence; a plurality of embedded grooves for installing rotating sealing elements are arranged in the second inner gradient annular groove, the other side of the stopper is connected to the surface of the first inner gradient annular groove, the second bearing is connected to the surface of the third inner gradient annular groove, the flow reducing sleeve fits the fourth inner gradient annular groove and the surface of the second cavity, and the second sealing element is arranged at the contact portion between the flow reducing sleeve and the second shell; The locking nut comprises a nut housing and a defined cavity arranged inside the nut housing, wherein the defined cavity is in close contact with the first sealing element, the first bearing, the thrust bearing, and the outer surface of the second housing; The distance between the second sealing element and the central axis where the first cavity and the second cavity coincide after fitting is not greater than the distance between the outer end face of the second bearing and the central axis; the distance between the outer end portion of the rotating sealing element and the central axis is not less than the distance between the outer end face of the second bearing and the central axis; the distance between the outer end portion of the stopper and the central axis is not less than the distance between the outer end portion of the rotating sealing element and the central axis; the distance between the outer end portion of the thrust bearing and the central axis is not less than the distance between the outer end portion of the stopper and the central axis.

2. The single-channel bidirectional rotary connector according to claim 1, characterized in that: The stopper is arranged on the outer surface of the first end portion and contacts the edge of the second end portion, and the stopper is also connected to the thrust bearing.

3. The single-channel bidirectional rotary connector according to claim 1, characterized in that: The circumferential angle corresponding to the stopper is 120°, and the three stoppers have the same structure.

4. The single-channel bidirectional rotary connector according to claim 1, characterized in that: The outer surface of the nut shell has a first platform and a second platform, and the first platform and the second platform are symmetrically arranged about the central axis of the nut shell.

5. The single-channel bidirectional rotary connector according to claim 1, characterized in that: The flow reducing sleeve includes a flow reducing shell and a flow reducing cavity arranged inside the flow reducing shell, wherein the diameter of the flow reducing cavity is smaller than the diameters of the first cavity and the second cavity; the flow reducing cavity also has a first transition cavity on the side in contact with the first cavity, and a second transition cavity is provided on the other side of the flow reducing cavity, and the first transition cavity and the second transition cavity are step structures.

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