CN215294028U

CN215294028U - Single-channel bidirectional-use rotary connector

Info

Publication number: CN215294028U
Application number: CN202120833103.1U
Authority: CN
Inventors: 仲浩洁; 宋琦; 王春峰; 李正桃
Original assignee: Changzhou Tongmin Machinery Technology Co ltd
Current assignee: Changzhou Tongmin Machinery Technology Co ltd
Priority date: 2021-04-22
Filing date: 2021-04-22
Publication date: 2021-12-24
Anticipated expiration: 2031-04-22

Abstract

The utility model relates to a single-channel bidirectional rotary connector, which comprises a first end part, a second end part and a locking nut, wherein the first end part and the second end part are sleeved and locked with the locking nut; after the outer surface of the first end part is matched with the inner surface of the second end part, a first sealing element, a first bearing, a thrust bearing, a stop block, a plurality of groups of rotary sealing elements and a second bearing which are arranged in parallel are sequentially arranged on a contact surface between the outer surface of the first end part and the locking nut, the first sealing element, the first bearing and the thrust bearing are arranged on the contact surface between the first end part and the locking nut, and the stop block, the rotary sealing element and the second bearing are arranged on the contact surface between the locking nut and the inner surface of the second end part; the second end is internally provided with a flow reducing sleeve, and the flow reducing sleeve and the inner step surface of the second end are provided with a second sealing element. The rotary connector is simple in structure, free of leakage in static use or high-speed rotation use, free of directional limitation in installation and use, good in sealing performance, high-pressure resistant, high-temperature resistant, high in load strength and long in service life.

Description

Single-channel bidirectional-use rotary connector

Technical Field

The utility model belongs to the technical field of the connector, concretely relates to rotary connector of two-way use of single channel.

Background

The rotary connector is a transition device for guiding an oil path or an air path into a rotary mechanism rotating at a high speed and controlling and distributing the oil path or the air path in the rotary mechanism, and in order to ensure the stability of the internal pressure of the rotary connector and the efficiency of guiding the oil path or the air path, the internal leakage problem in the rotary connector needs to be prevented. Rotary connectors are used in large arms, and are more commonly used at the tail of large arms of cranes and loaders.

The Chinese utility model patent CN 209469916U provides a single-channel rotary joint, the rotary valve is arranged into an extension end, a mounting end and a sealing section, and the sealing performance is improved by the matching of the sealing section and a rotary shaft seal; however, the rotary connector is used in a single-channel limited direction, and in actual use, the oil path or the air path moves in the opposite direction due to the problem of overlarge flow of the oil path or the air path, and the like, so that the sealing performance is poor, and the application range is narrow; the rotary joint has low integral stress strength and cannot operate at high load strength.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: to the above defect, the utility model provides a rotary connector of single channel two-way use, simple structure all does not have when static use or high-speed rotatory use and leaks, and the installation is used and is not had the direction restriction, and the leakproofness is good, high pressure resistant, high temperature resistant, and load strength is high, long service life.

The utility model provides a technical scheme that its technical problem adopted as follows: the single-channel bidirectional-use rotary connector comprises a first end part, a second end part and a locking nut, wherein the first end part and the second end part are sleeved and are in contact locking with the locking nut;

the outer surface of the first end part is matched with the inner surface of the second end part, and then a first sealing element, a first bearing, a thrust bearing, a stop block, a plurality of groups of rotary sealing elements and a second bearing which are arranged in parallel are sequentially arranged on a contact surface between the outer surface of the first end part and the locking nut;

a flow reducing sleeve is arranged in the second end part, and a second sealing element is arranged on the flow reducing sleeve and the inner step surface of the second end part; the flow reduction sleeve is disposed between the inner surfaces of the first end portion and the second end portion in contact.

The single-channel bidirectional-use rotary connector forms a shell with a cavity for an air path or an oil path to pass through a first end part and a second end part, can rotate for 360 degrees after being meshed through the locking nut, and is wide in application range; the sealing performance among the flow reducing sleeve, the first end part and the second end part is improved through the second sealing element, and oil leakage or air leakage is effectively reduced; the introduced first bearing, the second bearing and the thrust bearing meet the requirements of the rotary load, the radial direction and the axial direction when the crane or the loader and the like are used in a rotary state, and serve as a blocking and connecting piece to prevent oil leakage or air leakage; the introduced rotary sealing element is used as a heavy barrier to increase the connecting contact area between the first end part and the second end part, is in contact with the first end part and the second end part, and has the function of bidirectionally sealing the rotary connector; the introduced stop block has sealing performance, can disperse acting force on the first end part, the second end part and the thrust bearing in a high-speed motion state, and effectively prevents the rotary connector from deforming; the rotary connector has the advantages of good pressure resistance, large flow of an air path or an oil path under the same condition, good sealing performance, high stability, high load strength, long service life, no leakage in static use or high-speed rotation use, and no directional limitation on installation and use.

Furthermore, the stop block is arranged on the outer surface of the first end part and is contacted with the edge of the second end part, and the stop block is also connected with the thrust bearing.

Furthermore, the stop block is an arc stop block, and the corresponding circumferential angle of the arc stop block is 90-180 degrees; the arc-shaped stop blocks form a complete arc-shaped ring. Complete arc ring comprises the arc dog of a plurality of dispersions, and when the effort extrusion dog that first end, second end and thrust bearing received, the dog can be followed its installation cavity and taken place the motion, converts the extrusion force into dog motion thrust, further improves and prevents deformability, long service life.

Furthermore, the corresponding circumferential angle of the stop blocks is 120 degrees, and the three stop blocks have the same structure. Adopt the same dog structure, it is convenient to process, and three dog atress is even, reduces the fault rate that the dog warp and cause.

Further, the first end portion comprises a first shell and a first cavity arranged inside the first shell, 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 are sequentially arranged on the outer surface of the first shell from the end portion of the first end portion to the inside, the height of a shaft shoulder of the second outer stepped shaft is larger than that of the first outer stepped shaft and that of the third outer stepped shaft, and the height of a shaft shoulder of the fourth outer stepped shaft is larger than that of the shaft shoulder 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 a 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 stop block is arranged on the third outer stepped shaft, a plurality of rotary 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 part comprises a second shell and a second cavity arranged in the second shell, the inner surface of the second shell with the cavity is provided with 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 from the second shell to the side end part of the first shell inwards in sequence, and 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 sag degrees 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 are reduced in sequence; a plurality of embedded grooves for installing rotary sealing elements are arranged in the second inner gradient annular groove, the other side of the stop block is connected with the surface of the first inner gradient annular groove, the second bearing is connected with the surface of the third inner gradient annular groove, the flow reducing sleeve is attached to the surface of the fourth inner gradient annular groove and the surface of the second cavity, and the second sealing element is arranged at the contact part of the flow reducing sleeve and the second shell;

the locking nut comprises a nut shell and a limited cavity arranged inside the nut shell, and the limited cavity is in fit contact with the outer surfaces of the first sealing element, the first bearing, the thrust bearing and the second shell.

Further, the distance between the second sealing element and a central axis where the first cavity and the second cavity are superposed after the second sealing element is matched with the first cavity and the second cavity is not greater than the distance between the outer end surface of the second bearing and the central axis; the distance from the outer end part of the rotary sealing element to the central shaft is not less than the distance from the outer end surface of the second bearing to the central shaft; the distance between the outer end part of the stop block and the central shaft is not less than the distance between the outer end part of the rotary sealing element and the central shaft; the distance between the outer end part of the thrust bearing and the central shaft is not less than the distance between the outer end part of the stop block and the central shaft. The distance between the first end part and the second end part and the central axis of the contact piece is limited, gradient difference is formed, and the sealing performance is further improved.

Further, the rotary sealing element has at least 1.

Furthermore, a pair of first reinforcing plates are arranged 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 end parts of the first reinforcing plates do not exceed the edge of a fifth outer stepped shaft;

and the outer surface of the second shell is provided with a pair of second reinforcing plates, and the shape of the second reinforcing plates is the same as that of the second shell. The introduced first reinforcing plate and the introduced second reinforcing plate are convenient for the assembly of the first end part and the second end part and have a positioning effect when in use, and the compressive strength of the first shell and the second shell can be improved, so that the service life of the first shell and the second shell is prolonged.

Further, the outer surface of the nut shell is provided with a first platform and a second platform, and the first platform and the second platform are symmetrically arranged around the central axis of the nut shell. The introduced first platform and the introduced second platform are attractive in structure, convenient to install and position during locking and convenient to use.

Further, the flow reducing sleeve comprises a flow reducing shell and a flow reducing cavity arranged inside the flow reducing shell, and the diameter of the flow reducing cavity is smaller than the diameters of the first cavity and the second cavity; the flow reducing cavity is provided with a first transition cavity on one side in contact with the first cavity, 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 of a step structure. The flow reducing sleeve is introduced into the first transition cavity and the second transition cavity of the step structure, has a drainage guiding effect, reduces the possibility that an air path or an oil path conveyed in the cavity overflows from the interface of the second end part and the flow reducing sleeve, further improves the sealing performance, and reduces the probability of oil leakage or air leakage.

The utility model has the advantages that:

1. the single-channel bidirectional rotary connector forms a shell with a cavity for an air path or an oil path to pass through by a first end part and a second end part; the sealing performance among the flow reducing sleeve, the first end part and the second end part is improved through the second sealing element, and oil leakage or air leakage is effectively reduced; the introduced first bearing, the second bearing and the thrust bearing meet the requirements of the rotary load, the radial direction and the axial direction when the crane or the loader and the like are used in a rotary state, and serve as a blocking and connecting piece to prevent oil leakage or air leakage; the introduced rotary sealing element is used as a heavy barrier to increase the connecting contact area between the first end part and the second end part, is in contact with the first end part and the second end part, and has the function of bidirectionally sealing the rotary connector; the introduced stop block has sealing performance, can disperse acting force on the first end part, the second end part and the thrust bearing in a high-speed motion state, and effectively prevents the rotary connector from deforming; the rotary connector has the advantages of good pressure resistance, large flow of an air path or an oil path under the same condition, good sealing performance, high stability, high load strength, long service life, no leakage in static use or high-speed rotation use, and no directional limitation on installation and use.

2. The complete arc-shaped ring consists of a plurality of scattered arc-shaped check blocks, when the check blocks are extruded by acting forces on the first end part, the second end part and the thrust bearing, the check blocks can move along the installation cavity of the complete arc-shaped ring, the extruding force is converted into the movement thrust of the check blocks, the deformation resistance is further improved, and the service life is long; adopt the same dog structure, it is convenient to process, and three dog atress is even, reduces the fault rate that the dog warp and cause.

3. The distance between the first end part and the second end part and the central axis of the contact piece is limited, gradient difference is formed, and the sealing performance is further improved.

4. The first reinforcing plate and the second reinforcing plate are introduced into the first end part and the second end part, so that the first end part and the second end part can be conveniently assembled and have a positioning effect when in use, the compression strength of the first shell and the second shell can be improved, and the service life of the first shell and the second shell can be prolonged; the first platform and the second platform which are introduced into the locking nut have attractive structures, are convenient to install and position during locking, and are convenient and fast to use.

5. The flow reducing sleeve is introduced into the first transition cavity and the second transition cavity of the step structure, has a drainage guiding effect, reduces the possibility that an air path or an oil path conveyed in the cavity overflows from the interface of the second end part and the flow reducing sleeve, further improves the sealing performance, and reduces the probability of oil leakage or air leakage.

Drawings

The foregoing and other objects, features, and advantages of the invention will be apparent from the following detailed description taken in conjunction with the accompanying drawings.

FIG. 1 is a schematic sectional view of the present invention;

fig. 2 is a top view of the first end of the present invention;

FIG. 3 is a schematic cross-sectional view along AA in FIG. 2;

fig. 4 is a schematic perspective view of a first end of the present invention;

fig. 5 is a schematic top view of the second end of the present invention;

FIG. 6 is a schematic structural view of FIG. 5 taken along the line BB;

fig. 7 is a schematic perspective view of a second end portion of the present invention;

fig. 8 is a structural view of the locking nut of the present invention;

FIG. 9 is a schematic cross-sectional view taken along line CC of FIG. 8;

fig. 10 is a schematic view of the three-dimensional structure of the locking nut of the present invention;

FIG. 11 is a schematic cross-sectional view of the flow reducing sleeve of the present invention;

FIG. 12 is a schematic view of the three-dimensional structure of the stopper of the present invention;

wherein: 1 is a lock nut, 1a is a nut housing, 1b is a defined 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-shaped 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 ring groove, 34 is a second inner gradient ring groove, 35 is a third inner gradient ring groove, 36 is a fourth inner gradient ring groove, 37 is an embedded groove, 38 is a second reinforcing plate, 4 is a flow reducing sleeve, 41 is a flow reducing housing, 42 is a flow reducing chamber, 43 is a first transition chamber, 44 is a second transition chamber, 5 is a stopper, 6 is a first bearing, 7 is a thrust bearing, 8 is a second bearing, 9 is a first seal member, 10 is the rotary seal element and 11 is the second seal element.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, the single-channel bidirectional rotary connector comprises a first end portion 2, a second end portion 3, a locking nut 1 and a stop block 5, wherein the first end portion 2 and the second end portion 3 are internally provided with the stop block 5 and then are connected with the locking nut 1 for locking in a contact manner;

after the outer surface of the first end part 2 is matched with the inner surface of the second end part 3, a first sealing element 9, a first bearing 6, a thrust bearing 7, a stop block 5, a plurality of groups of rotary sealing elements 10 and a second bearing 8 which are arranged in parallel are sequentially arranged on a contact surface between the outer surface of the first end part 2 and the locking nut 1, the first sealing element 9, the first bearing 6 and the thrust bearing 7 are arranged on the contact surface between the first end part 2 and the locking nut 1, and the stop block 5, the rotary sealing element 10 and the second bearing 8 are arranged on the contact surface between the inner surface of the locking nut 1 and the inner surface of the second end part 3; a flow reducing sleeve 4 is arranged inside the second end part 3, and a second sealing element 11 is arranged on the flow reducing sleeve 4 and the step surface in the second end part 3; the flow reducing sleeve 4 is arranged between the inner surfaces of the first end part 2 contacted with the second end part 3, the stop 5 is arranged on the outer surface of the first end part 2 and contacted with the edge of the second end part 3, and the stop 5 is also connected with the thrust bearing 7.

Referring to fig. 2 to 4, the first end portion 2 includes a first housing 21 and a first cavity 22 disposed inside the first housing 21, 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 are sequentially disposed on an outer surface of the first housing 21 from a side end portion of the first end portion 2 to an inside, a 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, and a 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 are formed as a whole; the first outer stepped shaft 23, the second outer stepped shaft 24, the third outer stepped shaft 25, the fourth outer stepped shaft 26 and the arc-shaped groove 27 are all annularly arranged; the first sealing element 9 is arranged in the arc-shaped groove 27, the first bearing 6 is arranged on the outer surface of a fourth outer stepped shaft 26 close to the arc-shaped groove 27, the thrust bearing 7 is arranged on the other side of the fourth outer stepped shaft 26, the stop block 5 is arranged on a third outer stepped shaft 25, the surface of a second outer stepped shaft 24 is provided with a plurality of rotary sealing elements 10, and the second bearing 8 is arranged on the first outer stepped shaft 23; the outer surface of the first shell 21 is provided with a pair of first reinforcing plates 28, the shape of the first reinforcing plates 28 is the same as that of the first shell 21, and the end parts of the first reinforcing plates 28 are not beyond the edge of a fifth outer stepped shaft.

Referring to fig. 5 to 7, the second end portion 3 includes a second housing 31 and a second cavity 32 disposed inside the second housing 31, the second housing 31 has an inner surface with 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 sequentially disposed from the second housing 31 inward toward the side end portion of the first housing 21, and 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 an integral body; the sag of 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 is reduced in sequence; a plurality of embedded grooves 37 for mounting the rotary sealing element 10 are arranged in the second inner gradient annular groove 34, the other side of the stop block 5 is connected with the surface of the first inner gradient annular groove 33, the second bearing 8 is connected with the surface of the third inner gradient annular groove 35, the flow reducing sleeve 4 is attached to the surfaces of the fourth inner gradient annular groove 36 and the second cavity 32, and the second sealing element 11 is arranged at the contact part of the flow reducing sleeve 4 and the second shell 31; the outer surface of the second shell 31 is provided with a pair of second reinforcing plates 38, and the shape of the second reinforcing plates 38 is the same as that of the second shell 31.

With reference to fig. 8-10, the locking nut 1 comprises a nut shell 1a and a defined cavity 1b arranged inside the nut shell 1a, wherein the defined cavity 1b is in contact with the outer surfaces 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 is provided with a first platform 1c and a first platform 1d, and the first platform 1c and the first platform 1d are symmetrically arranged around the central axis of the nut shell 1 a.

Referring to fig. 11, the flow reducing sleeve 4 comprises a flow reducing housing 41 and a flow reducing cavity 42 arranged inside the flow reducing housing 41, wherein the diameter of the flow reducing cavity 42 is smaller than the diameter of the first cavity 22 and the second cavity 32; the side of the flow reducing cavity 42, which is in contact with the first cavity, is further provided with a first transition cavity 43, a second transition cavity 44 is arranged between the flow reducing cavity 42 and the second cavity, and the first transition cavity 43 and the second transition cavity 44 are of a step structure.

Referring to fig. 12, the stopper 5 is an arc stopper 5, and the arc stopper 5 corresponds to a circumferential angle of 90 to 180 degrees; the arc-shaped stoppers 5 form a complete arc-shaped ring, and as a preferred example of the present embodiment, the circumferential angle corresponding to each stopper 5 is 120 °, that is, the three stoppers 5 have the same structure, and the three stoppers 5 with the circumferential angle of 120 ° form a movable arc-shaped ring.

With continued reference to fig. 1, the distance of the second sealing element 11 from the central axis where the first cavity 22 and the second cavity 32 coincide after mating is no greater than the distance of the outer end face of the second bearing 8 from the central axis; the distance from the outer end part of the rotary sealing element 10 to the central shaft is not less than the distance from the outer end surface of the second bearing 8 to the central shaft; the distance between the outer end part of the stop block 5 and the central shaft is not less than the distance between the outer end part of the rotary sealing element 10 and the central shaft; the distance between the outer end part of the thrust bearing 7 and the central shaft is not less than the distance between the outer end part of the stop block 5 and the central shaft.

The number of the rotary sealing elements 10 is at least 1, and the embodiment adopts 2 rotary sealing elements 10, so that the rotary flexibility is improved, two layers of sealing barriers can be formed, and the sealing performance is good.

In a specific implementation process, the first shell 21 and the second shell 31 are set according to a setting direction of a to-be-connected component, the first shell 21 and the second shell 31 may be straight rods or bending structures with an included angle, and in this embodiment, both the first shell 21 and the second shell 31 are L-shaped structures with an included angle of 90 °.

The single-channel bidirectional rotary connector forms a shell with a cavity for an air path or an oil path to pass through by a first end part and a second end part; the sealing performance among the flow reducing sleeve, the first end part and the second end part is improved through the second sealing element, and oil leakage or air leakage is effectively reduced; the introduced first bearing, the second bearing and the thrust bearing meet the requirements of the rotary load, the radial direction and the axial direction when the crane or the loader and the like are used in a rotary state, and serve as a blocking and connecting piece to prevent oil leakage or air leakage; the introduced rotary sealing element is used as a heavy barrier to increase the connecting contact area between the first end part and the second end part, is in contact with the first end part and the second end part, and has the function of bidirectionally sealing the rotary connector; the introduced stop block has sealing performance, can disperse acting force on the first end part, the second end part and the thrust bearing in a high-speed motion state, and effectively prevents the rotary connector from deforming; the rotary connector has the advantages of good pressure resistance, highest 35MPa resistance, large flow rate of a gas circuit or an oil circuit under the same condition, good sealing performance, high stability, high load strength, long service life, no leakage in static use or high-speed rotation use, and no directional limitation on installation and use.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. The rotary connector that single channel two-way used, its characterized in that: the locking device comprises a first end part, a second end part and a locking nut, wherein the first end part and the second end part are sleeved and are in contact locking with the locking nut;

2. The single channel bi-directional use rotary connector of claim 1, wherein: the stop block is arranged on the outer surface of the first end part and is contacted with the edge of the second end part, and the stop block is also connected with the thrust bearing.

3. The single channel bi-directional use rotary connector of claim 2, wherein: the stop block is an arc stop block, and the corresponding circumferential angle of the arc stop block is 90-180 degrees; the arc-shaped stop blocks form a complete arc-shaped ring.

4. The single channel bi-directional use rotary connector of claim 3, wherein: the corresponding circumferential angle of the stop blocks is 120 degrees, and the three stop blocks have the same structure.

5. The single channel bi-directional use rotary connector of claim 1, wherein: the first end part comprises a first shell and a first cavity arranged in the first shell, 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 are sequentially arranged on the outer surface of the first shell from the end part at the first end part to the inside, the shoulder height of the second outer stepped shaft is greater than that of the first outer stepped shaft and that of 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 a 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 stop block is arranged on the third outer stepped shaft, a plurality of rotary 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;

6. The single channel bi-directional use rotary connector of claim 5, wherein: the distance between the second sealing element and a center axis where the first cavity and the second cavity are superposed after the second sealing element is matched is not more than the distance between the outer end surface of the second bearing and the center axis; the distance from the outer end part of the rotary sealing element to the central shaft is not less than the distance from the outer end surface of the second bearing to the central shaft; the distance between the outer end part of the stop block and the central shaft is not less than the distance between the outer end part of the rotary sealing element and the central shaft; the distance between the outer end part of the thrust bearing and the central shaft is not less than the distance between the outer end part of the stop block and the central shaft.

7. The single channel bi-directional use rotary connector of claim 1 or 6, wherein: the rotary sealing element has at least 1.

8. The single channel bi-directional use rotary connector of claim 5, wherein: the outer surface of the first shell is provided with a pair of first reinforcing plates, the shape of each first reinforcing plate is the same as that of the first shell, and the end parts of the first reinforcing plates do not exceed the edge of a fifth outer stepped shaft;

and the outer surface of the second shell is provided with a pair of second reinforcing plates, and the shape of the second reinforcing plates is the same as that of the second shell.

9. The single channel bi-directional use rotary connector of claim 5, wherein: the outer surface of the nut shell is provided with a first platform and a second platform, and the first platform and the second platform are symmetrically arranged around the central axis of the nut shell.

10. The single channel bi-directional use rotary connector of claim 5, wherein: the flow reducing sleeve comprises a flow reducing shell and a flow reducing cavity arranged inside the flow reducing shell, and the diameter of the flow reducing cavity is smaller than the diameters of the first cavity and the second cavity; the flow reducing cavity is provided with a first transition cavity on one side in contact with the first cavity, 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 of a step structure.