CN210950311U - Bidirectional air-float rotary joint - Google Patents
Bidirectional air-float rotary joint Download PDFInfo
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- CN210950311U CN210950311U CN201922134626.2U CN201922134626U CN210950311U CN 210950311 U CN210950311 U CN 210950311U CN 201922134626 U CN201922134626 U CN 201922134626U CN 210950311 U CN210950311 U CN 210950311U
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Abstract
The utility model discloses a bidirectional air-float rotary joint, which comprises a shaft, a floating ring, a shell, a retainer ring, at least two rows of fourth air passages and at least two orifices; the fourth air channel is radially arranged inside the floating ring; one end of the fourth air passage is communicated with the second air passage, and the other end of the fourth air passage is communicated with the axial gap between the floating ring and the shaft; the throttling hole is axially arranged inside the floating ring; one end of the throttling hole is communicated with the second air passage, and the other end of the throttling hole is communicated with a radial gap between the floating ring and the shaft; the radial load and the axial load of the utility model are supported by air flotation, and the whole structure has no any contact type dynamic friction part, thereby avoiding the abrasive dust from entering into the transmission medium and ensuring the cleanness and no pollution of the transmission medium; and a non-contact clearance sealing mode is adopted, and an air film is formed between the shaft and the floating ring, so that solid-phase contact friction is avoided, and the rotary joint can be ensured to have a long service life.
Description
Technical Field
The utility model belongs to the technical field of rotary joint, concretely relates to two-way air supporting rotary joint.
Background
The rotary joint is a key component for conveying oil, water, gas and other media to rotary equipment, and connects media flowing in a static pipeline to the inside of a moving component to realize conversion of media transmission from static to dynamic. The rotary joint belongs to mechanical basic parts, and the application field of the rotary joint almost covers various processing and manufacturing industries, including metallurgy, machine tools, power generation, petroleum, rubber, plastics, textile, printing and dyeing, pharmacy, papermaking, food processing and the like.
At present, rotary joints mostly adopt contact type sealing design, and the problems of large friction resistance, short service life and easy generation of sealing element abrasion particles so as to pollute the equipment operation environment generally exist. The non-contact gap sealing technology is a sealing mode that a layer of fluid film is filled between sealing end faces to force the sealing end faces to be separated from each other due to the action of hydrostatic pressure or dynamic pressure, and hard solid-phase contact does not exist. By adopting the gap sealing technology, the adhesion abrasion between metals can be theoretically reduced, and the service life of the rotary joint is obviously prolonged. Such as the non-contact rotary joint of GAT company and MAIER in germany, but the structure still uses rolling bearings and contact seal components, and the grinding of grease and seals in the bearings may contaminate the transmission medium and may not meet the requirement of high cleanliness.
In order to solve the above problems, the inventor has developed a bidirectional air-float rotary joint.
Disclosure of Invention
The present invention is directed to a bidirectional air-float rotary joint for solving the above problems.
The utility model discloses a following technical scheme realizes above-mentioned purpose:
two-way air supporting rotary joint includes:
a shaft; the shaft comprises a small-diameter cylinder and a large-diameter cylinder which are connected with each other, and the small-diameter cylinder and the large-diameter cylinder are coaxial; a first air passage is arranged in the small-diameter cylinder of the shaft;
a floating ring; the floating ring is sleeved outside the small-diameter cylinder of the shaft and forms axial clearance fit; one end of the small-diameter cylinder of the shaft is connected with external equipment; the first end surface of the floating ring and one end of a large-diameter cylinder of the shaft form radial clearance fit; a second air passage is arranged in the floating ring;
a housing; the shell is sleeved outside the floating ring, and a third air passage is arranged in the shell; the first air passage, the second air passage and the third air passage are communicated; the gas medium sequentially passes through the third gas passage, the second gas passage and the first gas passage and then is output to external equipment;
a retainer ring; the retainer ring is annular, is fixed on the shell and is used for clamping the second end surface of the floating ring;
at least two rows of fourth air ducts; the fourth air channel is radially arranged inside the floating ring; one end of the fourth air passage is communicated with the second air passage, and the other end of the fourth air passage is communicated with the axial gap between the floating ring and the shaft;
at least two orifices; the throttling hole is axially arranged inside the floating ring; one end of the orifice is communicated with the second air passage, and the other end of the orifice is communicated with the radial gap between the floating ring and the shaft.
The beneficial effects of the utility model reside in that:
the utility model relates to a bidirectional air-float rotary joint;
the radial load and the axial load are supported by air floatation, and the whole structure does not have any contact type dynamic friction part, thereby avoiding abrasive dust from entering a transmission medium and ensuring the cleanness and no pollution of the transmission medium; and a non-contact clearance sealing mode is adopted, and an air film is formed between the shaft and the floating ring, so that solid-phase contact friction is avoided, and the rotary joint can be ensured to have a long service life.
Drawings
Fig. 1 is a front sectional view of the present invention;
FIG. 2 is a side view of FIG. 1;
FIG. 3 is a top view of FIG. 1;
fig. 4 is a schematic structural view of the middle shaft of the present invention;
FIG. 5 is a sectional view A-A of FIG. 4;
FIG. 6 is a schematic structural view of a floating ring according to the present invention;
FIG. 7 is a side view in the direction of A in FIG. 6;
FIG. 8 is a cross-sectional view B-B of FIG. 6;
FIG. 9 is a cross-sectional view C-C of FIG. 6;
fig. 10 is a schematic structural diagram of the housing of the present invention.
In the figure: 1. the sealing ring comprises a shaft, 11 external threads, 12 axial air delivery holes, 13 radial air inlet holes, 14 first radial air floating surfaces, 15 first axial air floating surfaces, 2 retaining rings, 21 large holes, 22 small holes, 23 first air inlet holes, 24 annular pressure equalizing grooves, 25 second radial air floating surfaces, 26 second axial air floating surfaces, 27 throttle holes, 28 air cavities, 3 shells, 31 first grooves, 32 threaded holes, 33 second air inlet holes, 34 second grooves, 4 floating rings and 5O-shaped sealing rings.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings:
as shown in fig. 1-3; two-way air supporting rotary joint includes:
a shaft 1; the shaft 1 comprises a small-diameter cylinder and a large-diameter cylinder which are connected with each other, and the small-diameter cylinder and the large-diameter cylinder are coaxial; a first air passage is arranged in the small-diameter cylinder of the shaft 1;
a floating ring 4; the floating ring 4 is sleeved outside the small-diameter cylinder of the shaft 1 and forms axial clearance fit; one end of a small-diameter cylinder of the shaft 1 is connected with external equipment; the first end surface of the floating ring 4 forms radial clearance fit with one end of a large-diameter cylinder of the shaft 1; a second air passage is arranged in the floating ring 4;
a housing 3; the shell 3 is sleeved outside the floating ring 4, and a third air passage is arranged in the shell 3; the first air passage, the second air passage and the third air passage are communicated; the gas medium sequentially passes through the third gas passage, the second gas passage and the first gas passage and then is output to external equipment;
a retainer ring 2; the retainer ring 2 is annular, the retainer ring 2 is fixed on the shell 3, and the retainer ring 2 is used for clamping the second end face of the floating ring 4;
at least two rows of fourth air ducts; the fourth air passage is radially arranged inside the floating ring 4; one end of the fourth air passage is communicated with the second air passage, and the other end of the fourth air passage is communicated with the axial gap between the floating ring 4 and the shaft 1;
at least two orifices 27; the throttle orifice 27 is arranged axially inside the floating ring 4; one end of the orifice 27 communicates with the second gas passage, and the other end of the orifice 27 communicates with the radial gap between the floating ring 4 and the shaft 1.
In some embodiments, an external thread 11 is provided outside one end of the small diameter cylinder of the shaft 1, and the shaft 1 is connected to an external device through the external thread 11.
In the present embodiment, the clearance of the clearance fit is preferably in the range of several micrometers to several tens of micrometers, determined in particular by the structural dimensions and the bearing capacity.
As shown in fig. 4 and 5; the first air passage comprises an axial air delivery hole 12 distributed along the axial direction of the shaft 1 and at least one radial air inlet hole 13 distributed along the radial direction, and one end of the radial air inlet hole 13 is communicated with the axial air delivery hole 12;
as shown in fig. 6 and 9; the second air passage comprises an annular pressure-equalizing groove 24, an air cavity 28 and at least one first air inlet hole 23, the annular pressure-equalizing groove 24 is arranged around the outer wall of the shaft 1, the annular pressure-equalizing groove 24 is communicated with the other end of the radial air inlet hole 13 and one end of the first air inlet hole 23, and the other end of the first air inlet hole 23 is communicated with the air cavity 28;
as shown in fig. 10; the third air passage is a second air inlet hole 33, and the second air inlet hole 33 is communicated with the air cavity 28.
As shown in fig. 6 and 8; the fourth air passages of at least two rows are mutually parallel; each row of fourth air passages comprises at least two air hole combinations which are uniformly distributed around the axial lead of the floating ring 4, each air hole combination comprises a large hole 21 and a small hole 22, one end of each large hole 21 is communicated with the air cavity 28, the other end of each large hole 21 is communicated with one end of each small hole 22, and the other end of each small hole 22 penetrates through the inner wall of the floating ring 4 and is communicated with an axial gap between the floating ring 4 and the shaft 1;
as shown in fig. 6 and 7; at least two orifices 27 are evenly distributed around the axial center line of the floating ring 4; one end of the orifice 27 is communicated with the large hole 21 and then communicated with the second air passage, and the other end of the orifice 27 penetrates through the inner wall of the floating ring 4 and is communicated with the radial gap between the floating ring 4 and the shaft 1. In the present embodiment, the floating ring is provided with the large hole 21, the small hole 22 and the throttle hole 27, and the compressed gas enters a tiny gap between the shaft 1 and the floating ring 4 through the large hole 21, the small hole 22 and the throttle hole 27 to form a gas film, so that the contact friction between the shaft 1 and the floating ring 4 is prevented. Fig. 7 shows the case where the orifice 27 is eight.
In the present embodiment, the annular pressure equalizing groove 24 and the air cavity 28 are both arranged to make the transmission of the air smoother;
preferably, the number of the radial air inlet holes 13 and the number of the first air inlet holes 23 are at least two and are uniformly distributed around the axial lead of the shaft 1.
Further preferably, the number of the first air intake holes 23 and the number of the radial air intake holes 13 are both even. In fig. 5, the case of four radial inlet holes 13 is shown.
As shown in fig. 8 and 9, the case that the number of the first air inlet holes 23 is 8 is shown, and eight large holes 21 and eight small holes 22 are provided in each row;
as shown in fig. 10; the housing 3 is formed in an annular shape, an annular first groove 31 is formed on the inner wall of the housing 3, and the retainer ring 2 is fixedly installed in the first groove 31.
As shown in fig. 10; two second grooves 34 are arranged on the inner wall of the shell 3, the O-shaped sealing ring 5 is arranged in the second grooves 34, and the two second grooves 34 are arranged at the joint of the floating ring 4 and the shell 3 and are respectively positioned at the two axial ends of the air cavity 28.
As shown in fig. 10; the housing 3 is also provided with a threaded hole 32 for mounting the anti-rotation bar.
Preferably, the threaded holes 32 are at least two and evenly distributed about the axis of the housing.
As shown in fig. 1 and 2; the shaft 1, the floating ring 4 and the shell 3 are all coaxial.
As shown in fig. 4, the generation positions of the first radial air bearing surface 14 and the first axial air bearing surface 15 are also shown; and the small diameter cylinder of the shaft 1 is also provided with an annular step, and the retainer ring 2 is inwards clamped at the annular step and is not contacted with the shaft 1.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. Two-way air supporting rotary joint, its characterized in that includes:
a shaft (1); the shaft (1) comprises a small-diameter cylinder and a large-diameter cylinder which are connected with each other, and the small-diameter cylinder and the large-diameter cylinder are coaxial; a first air passage is arranged in the small-diameter cylinder of the shaft (1);
a floating ring (4); the floating ring (4) is sleeved outside the small-diameter cylinder of the shaft (1) and forms axial clearance fit; one end of a small-diameter cylinder of the shaft (1) is connected with external equipment; the first end surface of the floating ring (4) is in clearance fit with one end of a large-diameter cylinder of the shaft (1) in the radial direction; a second air passage is arranged in the floating ring (4);
a housing (3); the shell (3) is sleeved outside the floating ring (4), and a third air passage is arranged in the shell (3); the first air passage, the second air passage and the third air passage are communicated; the gas medium sequentially passes through the third gas passage, the second gas passage and the first gas passage and then is output to external equipment;
a retainer ring (2); the retainer ring (2) is annular, the retainer ring (2) is fixed on the shell (3), and the retainer ring (2) is used for clamping the second end face of the floating ring (4);
at least two rows of fourth air ducts; the fourth air channel is radially arranged inside the floating ring (4); one end of the fourth air passage is communicated with the second air passage, and the other end of the fourth air passage is communicated with an axial gap between the floating ring (4) and the shaft (1);
at least two orifices (27); the throttle hole (27) is axially arranged inside the floating ring (4); one end of the throttle hole (27) is communicated with the second air passage, and the other end of the throttle hole (27) is communicated with a radial gap between the floating ring (4) and the shaft (1).
2. The bi-directional air bearing rotary joint as set forth in claim 1, wherein:
the first air passage comprises an axial air delivery hole (12) distributed along the axial direction of the shaft (1) and at least one radial air inlet hole (13) distributed along the radial direction, and one end of each radial air inlet hole (13) is communicated with the axial air delivery hole (12);
the second air passage comprises an annular pressure equalizing groove (24), an air cavity (28) and at least one first air inlet hole (23), the annular pressure equalizing groove (24) is arranged around the outer wall of the shaft (1), the annular pressure equalizing groove (24) is communicated with the other end of the radial air inlet hole (13) and one end of the first air inlet hole (23), and the other end of the first air inlet hole (23) is communicated with the air cavity (28);
the third air passage is a second air inlet hole (33), and the second air inlet hole (33) is communicated with the air cavity (28).
3. The bi-directional air bearing rotary joint as set forth in claim 2, wherein:
the fourth air passages of at least two rows are mutually parallel; each row of fourth air passages comprises at least two air hole combinations which are uniformly distributed around the axial lead of the floating ring (4), each air hole combination comprises a large hole (21) and a small hole (22), one end of each large hole (21) is communicated with the air cavity (28), the other end of each large hole (21) is communicated with one end of each small hole (22), and the other end of each small hole (22) penetrates through the inner wall of the floating ring (4) and is communicated with an axial gap between the floating ring (4) and the shaft (1);
at least two orifices (27) are evenly distributed around the axial lead of the floating ring (4); one end of the throttling hole (27) is communicated with the large hole (21) and then communicated with the second air passage, and the other end of the throttling hole (27) penetrates through the inner wall of the floating ring (4) and is communicated with a radial gap between the floating ring (4) and the shaft (1).
4. The bi-directional air bearing rotary joint as set forth in claim 2, wherein: the radial air inlet holes (13) and the first air inlet holes (23) are at least two and are uniformly distributed around the axial lead of the shaft (1).
5. The bi-directional air bearing rotary joint as set forth in claim 4, wherein: the number of the first air inlet holes (23) and the number of the radial air inlet holes (13) are even.
6. The bi-directional air bearing rotary joint as set forth in claim 2, wherein: the outer shell (3) is annular, an annular first groove (31) is formed in the inner wall of the outer shell (3), and the retainer ring (2) is fixedly installed in the first groove (31).
7. The bi-directional air bearing rotary joint as set forth in claim 6, wherein: two second grooves (34) are formed in the inner wall of the shell (3), the O-shaped sealing ring (5) is installed in the second grooves (34), and the two second grooves (34) are arranged at the connecting position of the floating ring (4) and the shell (3) and are respectively located at the two axial ends of the air cavity (28).
8. The bi-directional air bearing rotary joint as set forth in claim 1, wherein: the shell (3) is also provided with a threaded hole (32) for installing the anti-rotation rod.
9. The bi-directional air bearing rotary joint as set forth in claim 8, wherein: the number of the threaded holes (32) is at least two, and the threaded holes are evenly distributed around the axis of the shell.
10. The bi-directional air bearing rotary joint as set forth in claim 1, wherein: the shaft (1), the floating ring (4) and the shell (3) are coaxial.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922134626.2U CN210950311U (en) | 2019-12-03 | 2019-12-03 | Bidirectional air-float rotary joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922134626.2U CN210950311U (en) | 2019-12-03 | 2019-12-03 | Bidirectional air-float rotary joint |
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| Publication Number | Publication Date |
|---|---|
| CN210950311U true CN210950311U (en) | 2020-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922134626.2U Active CN210950311U (en) | 2019-12-03 | 2019-12-03 | Bidirectional air-float rotary joint |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110778823A (en) * | 2019-12-03 | 2020-02-11 | 中国工程物理研究院总体工程研究所 | Bidirectional air-float rotary joint |
| CN115692299A (en) * | 2022-12-27 | 2023-02-03 | 苏州猎奇智能设备有限公司 | Air-flotation rotary adsorption structure and use method thereof |
-
2019
- 2019-12-03 CN CN201922134626.2U patent/CN210950311U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110778823A (en) * | 2019-12-03 | 2020-02-11 | 中国工程物理研究院总体工程研究所 | Bidirectional air-float rotary joint |
| CN115692299A (en) * | 2022-12-27 | 2023-02-03 | 苏州猎奇智能设备有限公司 | Air-flotation rotary adsorption structure and use method thereof |
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