Multi-channel rotary joint

Abstract

The utility model discloses a multi-channel rotary joint, and aims to solve the technical problems that in the prior art, the contact positions of a rotor and a stator which relatively rotate and work for a long time are mutually embedded and rubbed, abrasion of the matching surfaces of parts and a sealing ring is accelerated, and media leak from the sealing ring. Comprising a rotor air shaft, a stator shell and a plurality of high-pressure sealing pieces, a plurality of through air-liquid inlet and outlet holes are formed in the upper end and the lower end of the stator shell, sealing ring grooves are formed in the two sides of each air-liquid inlet and outlet hole, side blocks are arranged on the two sides of each sealing ring groove, and the high-pressure sealing pieces are installed in the sealing ring grooves. The rotor air shaft is provided with a plurality of annular grooves and wear-resisting rings matched with the annular grooves, the wear-resisting rings correspond to the high-pressure sealing pieces in position, the wear-resisting rings are made of ceramic, and the ceramic wear-resisting rings effectively improve the surface wear-resisting strength and effectively reduce the wear of the lower end faces, making contact with the surfaces of the wear-resisting rings, of the side blocks of the sealing ring grooves and the high-pressure sealing pieces. And the service life of the high-pressure sealing element and the multi-channel rotary joint is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of rotary joints, in particular to a multi-channel rotary joint. Background Art

[0002] The adapter belongs to the application category of mechanical sliding connection. It is also called air slip ring, air rotary joint, and air. It is a precision power transmission device that realizes the transmission of air pressure between two relatively rotating mechanisms. It is particularly suitable for unlimited continuous rotation, and at the same time, it is a precision device that needs to transmit air pressure oil power from a fixed position to a rotating position. The adapter includes a rotor and a stator. In order to ensure the supply of air pressure during the rotary motion, sealing rings are arranged on both sides of the rotor annular oil groove to prevent the air pressure oil in the annular oil groove from overflowing under high pressure. Since the rotor and stator of the existing adapter are made of metal, the contact between the two will be engaged and rubbed against each other and the sealing ring will rub against each other during long-term relative rotation. The falling metal debris and sealing ring debris, as abrasives, continue to participate in the friction, and accelerate the wear of the mating surface of the parts. The abrasive also causes serious wear of the sealing ring between the rotor and the stator. Due to the very high air pressure, the wear of the sealing ring and the wear between the rotor and the stator can easily cause the medium to leak from the sealing ring, affecting the work efficiency and work stability, and even becoming a potential accident hazard. Utility Model Content

[0003] (1) Technical issues to be solved

[0004] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a multi-channel rotary joint, aiming to solve the technical problems in the prior art that the rotor and the stator, which work in relative rotation for a long time, rub against each other at the contact point, accelerate the wear of the mating surfaces of the parts and the sealing ring, and cause the medium to leak from the sealing ring.

[0005] (2) Technical solution

[0006] A multi-channel rotary joint comprises a rotor gas shaft, a stator housing and a plurality of high-pressure seals, wherein the upper and lower ends of the stator housing are provided with a plurality of through gas-liquid inlet and outlet holes, each of the gas-liquid inlet and outlet holes is provided with a sealing ring groove on both sides, and side blocks are provided on both sides of the sealing ring groove, the high-pressure seal is installed in the sealing ring groove, and the rotor gas shaft is provided with a plurality of annular grooves and wear-resistant rings adapted to the annular grooves, and when the rotor gas shaft is passed through the stator housing and fixed, the wear-resistant ring corresponds to the position of the high-pressure seal.

[0007] Furthermore, the wear-resistant ring is made of ceramic and has a smooth surface.

[0008] Furthermore, an annular protrusion is provided on the rotor air shaft, the annular groove is provided on the annular protrusion, and the wear-resistant ring contacts the high-pressure seal.

[0009] Furthermore, the sealing ring groove width L1 is less than or equal to the annular groove width L2, and both ends of the annular protrusion are arranged in arc shape.

[0010] Furthermore, the wear-resistant ring is sprayed in the annular groove, and the spraying steps include surface processing, front polishing, sand blasting, high-temperature thermal spraying, drying and cooling, grinding, fine polishing, and quality inspection.

[0011] Furthermore, four gas-liquid inlet and outlet holes are respectively provided at the upper and lower ends of the stator housing.

[0012] Furthermore, the rotor air shaft is provided with a plurality of clamping platforms with increasingly smaller diameters from left to right, and the plurality of clamping platforms correspond one-to-one to the positions of the sealing ring grooves respectively.

[0013] Furthermore, a left retaining wall is provided on the left side of the card platform.

[0014] Furthermore, the lower end surface of the side block on the left side of the sealing ring groove is higher than the lower end surface of the side block on the right side, and there is a gap between the side block on the right side and the right side of the wear-resistant ring.

[0015] (3) Beneficial effects

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The wear-resistant ring of the utility model is made of ceramic, and the hardness of the ceramic is between 6.5 and 9.0 on the Mohs hardness scale. It has the advantages of high chemical stability, high temperature resistance, high strength, wear resistance, corrosion resistance, high compressive strength, good electrical insulation performance, good biocompatibility, etc. When the multi-channel rotary joint rotates at high speed for a long time, the lower end faces of the blocks on both sides of the sealing ring groove and the wear-resistant ring rotate and rub, and the ceramic wear-resistant ring effectively improves the surface wear resistance due to its own hardness, and the surface of the wear-resistant ring is smooth and the dynamic friction coefficient is small, which effectively reduces the wear of the lower end faces of the side blocks of the sealing ring groove and the high-pressure seals that are in contact with the surface of the wear-resistant ring, thereby improving the service life of the high-pressure seals and the multi-channel rotary joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 : A three-dimensional structural diagram of a multi-channel rotary joint of the present utility model.

[0019] Figure 2 : Explosion of the utility model multi-channel rotary joint Figure 1 .

[0020] Figure 3 : Explosion of the utility model multi-channel rotary joint Figure 2 .

[0021] Figure 4 : Embodiment 1 of the utility model Figure 2 Enlarged view of part A.

[0022] Figure 5 : A cross-sectional view of a multi-channel rotary joint according to embodiment 1 of the present invention.

[0023] Figure 6 : Embodiment 1 of the utility model Figure 5 Enlarged view of part B.

[0024] Figure 7 : Schematic diagram of the structure of the rotor air shaft part of the second embodiment of the utility model.

[0025] Figure 8 :The utility model embodiment 2 Figure 7 Enlarged view of part C.

[0026] Fig. 9 : Schematic diagram of the side block of the second embodiment of the utility model blocking the right side of the wear-resistant ring.

[0027] Fig.10 : Schematic diagram of the number of rotations of two rotary joints of the utility model undergoing wear testing.

[0028] The components in the attached drawings are marked as follows: 1-rotor air shaft; 2-stator housing; 3-high-pressure seal; 4-gas-liquid inlet and outlet holes; 5-sealing ring groove; 6-side block; 7-annular groove; 8-wear-resistant ring; 9-annular protrusion; 10-card platform; 11-left retaining wall. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention;

[0030] See also Figure 1-10 ;

[0031] like Figure 1-6The figure shows a first embodiment of a multi-channel rotary joint of the utility model, comprising a rotor gas shaft 1, a stator housing 2 and a plurality of high-pressure seals 3. The stator housing 2 is hollow inside, and a plurality of through gas-liquid inlet and outlet holes 4 are provided at the upper and lower ends of the stator housing 2. Each of the gas-liquid inlet and outlet holes 4 is provided with a sealing ring groove 5 on both sides, and side blocks 6 are provided on both sides of the sealing ring groove 5. The high-pressure seal 3 is installed in the sealing ring groove 5; a plurality of annular grooves 7 and wear-resistant rings 8 adapted to the annular grooves 7 are provided on the rotor gas shaft 1. When the rotor gas shaft 1 passes through the stator housing 2 and is fixed, the wear-resistant ring 8 of the annular groove 7 corresponds to the position of the high-pressure seal 3. It should be noted that The wear-resistant ring 8 is made of ceramic, and the hardness of the ceramic is between 6.5 and 9.0 on the Mohs hardness scale. It has the advantages of high chemical stability, high temperature resistance, high strength, wear resistance, corrosion resistance, high compressive strength, good electrical insulation performance, and good biocompatibility. When the multi-channel rotary joint rotates at high speed for a long time, the lower end face of the high-pressure seal 3 and the surface of the wear-resistant ring 8 rotate and rub, and the ceramic wear-resistant ring 8 effectively improves the surface wear resistance due to its own hardness, and the surface of the wear-resistant ring 8 is smooth and the dynamic friction coefficient is small, which effectively reduces the wear of the lower end face of the side block 6 of the sealing ring groove 5 and the high-pressure seal 3 that are in contact with the surface of the wear-resistant ring 8, thereby improving the service life of the high-pressure seal 3 and the multi-channel rotary joint.

[0032] Specifically, an annular protrusion 9 is provided on the rotor air shaft 1, and the annular groove 7 is arranged on the annular protrusion 9. The width L1 of the sealing ring groove 5 is set to be less than or equal to the width L2 of the annular groove 7, to ensure that the entire surface of the wear-resistant ring 8 only contacts the high-pressure seal 3, or contacts the high-pressure seal 3 and the lower end faces of the side blocks 6 at both ends of the sealing ring groove 5 at the same time, to play a wear-resistant role. The two ends of the annular protrusion 9 are arranged in an arc shape, so that the lower end face of the side block 6 cannot contact the two ends of the annular protrusion 9, so that the side block 6 and the high-pressure seal 3 only contact the wear-resistant ring 8, effectively avoiding the friction between the side block 6 and the annular protrusion 9 to generate metal debris, thereby improving the service life of the high-pressure seal 3.

[0033] The high-pressure seal 3 is arranged to be tightly matched at the wear-resistant ring 8 . During operation, the side block 6 of the rotor air shaft 1 rotates relative to the wear-resistant ring 8 of the stator housing 2 and the high-pressure seal 3 .

[0034] Specifically, the wear-resistant ring 8 of the first embodiment of the utility model is assembled and fixed in the annular groove 7 by a spraying process, and the required material is selected and then sprayed;

[0035] Here are the steps:

[0036] S1: surface processing, processing the surface of the selected material to obtain an annular groove 7;

[0037] S2: Front polishing to remove small burrs or tool marks after turning;

[0038] S3: sand blowing, dust removal, impurity removal, surface roughening treatment;

[0039] S4: high-temperature thermal spraying, spraying the prepared metal ceramic coating on the surface of the annular groove 7 through a high-pressure spraying device to obtain a wear-resistant ring 8;

[0040] S5: Drying and cooling: the sprayed ceramic coating wear-resistant ring 8 is dried, cured and cooled by a drying device;

[0041] S6: Grinding: grinding the surface size accuracy and surface roughness according to actual needs;

[0042] S7: Fine polishing, grinding the surface of the wear-resistant ring 8 beyond the upper end surface of the annular groove 7, so that the upper end surface of the annular groove 7 and the upper end surface of the wear-resistant ring 8 are on the same horizontal line, and the surface is smooth;

[0043] S8: Quality inspection to ensure that the multi-channel rotary joint is of good quality.

[0044] After the above process, the wear resistance and high temperature performance of the wear-resistant ring 8 are greatly improved.

[0045] like Fig.10 As shown, the left rotary joint was tested at a speed of 200 revolutions per minute, and has now rotated more than 56 million times; the right rotary joint was tested at a speed of 400 revolutions per minute, and has now rotated more than 110 million times; when the patent was submitted, it was still under normal testing. In actual use, the rotary joint rotates once per revolution, and the wear-resistant rings 8 of the two rotary joints are still intact, without cracking or peeling. The spraying process is simple and low-cost.

[0046] Specifically, four gas-liquid inlet and outlet holes 4 are respectively provided at the upper and lower ends of the stator housing 2, which can transmit different media simultaneously without interfering with each other. The medium in this embodiment can be fluid substances such as oil, water, and gas.

[0047] like Figure 7-9The second embodiment of the utility model is shown, which is different from the first embodiment in that the rotor air shaft 1 is provided with a plurality of clamping platforms 10 with smaller and smaller diameters from left to right, and the plurality of clamping platforms 10 correspond to the positions of the sealing ring groove 5 respectively. A left retaining wall 11 is provided on the left side of the clamping platform 10. The wear-resistant ring 8 is first processed into a plurality of ring-shaped bodies with different diameters outside the rotor air shaft 1, and the obtained wear-resistant ring 8 is adapted to the clamping platforms 10 with different diameters. The lower end surface of the side block 6 on the left side of the sealing ring groove 5 is higher than the lower end surface of the side block 6 on the right side. During assembly, the wear-resistant ring 8 with the largest diameter is passed through the rotor air shaft 1 from right to left until it is located at the clamping platform 10. At this time, the left side of the wear-resistant ring 8 is blocked by the left retaining wall 11. The step-type chucks 10 are then assembled one by one from right to left, so that the wear-resistant ring 8 is embedded in the chuck 10 and tightly combined with it. When the wear-resistant ring 8 is assembled, the rotor air shaft 1 is inserted into the stator housing 2 from left to right for assembly. A gap is set between the right side block 6 and the right side of the wear-resistant ring 8 to avoid friction between the side block 6 and the wear-resistant ring 8 to produce debris. The diameter size is set to be a slight change, which will not affect the overall assembly and use. This process has few assembly steps, and the high-pressure seal 3 is set to fit tightly at the wear-resistant ring 8. When working, the side block 6 of the rotor air shaft 1 rotates relative to the wear-resistant ring 8 and the high-pressure seal 3 of the stator housing 2. The structure is simple and the service life of the multi-channel rotary joint is effectively improved.

[0048] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0049] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims

1. A multi-channel rotary joint, characterized in that: The invention comprises a rotor air shaft (1), a stator housing (2) and a plurality of high-pressure seals (3). The stator housing (2) is provided with a plurality of through gas-liquid inlet and outlet holes (4) at the upper and lower ends. Each of the gas-liquid inlet and outlet holes (4) is provided with a sealing ring groove (5) on both sides. The sealing ring groove (5) is provided with side blocks (6) on both sides. The high-pressure seal (3) is installed in the sealing ring groove (5). The rotor air shaft (1) is provided with a plurality of annular grooves (7) and wear-resistant rings (8) adapted to the annular grooves (7). When the rotor air shaft (1) passes through the stator housing (2) and is fixed, the wear-resistant ring (8) corresponds to the position of the high-pressure seal (3).

2. A multi-channel rotary joint according to claim 1, characterized in that: The wear-resistant ring (8) is made of ceramic and has a smooth surface.

3. A multi-channel rotary joint according to claim 2, characterized in that: An annular protrusion (9) is provided on the rotor air shaft (1), the annular groove (7) is arranged on the annular protrusion (9), and the wear-resistant ring (8) contacts the high-pressure seal (3).

4. A multi-channel rotary joint according to claim 3, characterized in that: The width L1 of the sealing ring groove (5) is less than or equal to the width L2 of the annular groove (7), and both ends of the annular protrusion (9) are arranged in an arc shape.

5. A multi-channel rotary joint according to claim 4, characterized in that: The wear-resistant ring (8) is sprayed in the annular groove (7), and the spraying steps include surface processing, front polishing, sand blasting, high-temperature thermal spraying, drying and cooling, grinding, fine polishing, and quality inspection.

6. A multi-channel rotary joint according to claim 5, characterized in that: Four gas-liquid inlet and outlet holes (4) are respectively provided at the upper and lower ends of the stator housing (2).

7. A multi-channel rotary joint according to claim 2, characterized in that: The rotor air shaft (1) is provided with a plurality of clamping platforms (10) with increasingly smaller diameters in sequence from left to right, and the plurality of clamping platforms (10) correspond one-to-one to the positions of the sealing ring grooves (5).

8. A multi-channel rotary joint according to claim 7, characterized in that: A left retaining wall (11) is provided on the left side of the card platform (10).

9. A multi-channel rotary joint according to claim 8, characterized in that: The lower end surface of the side block (6) on the left side of the sealing ring groove (5) is higher than the lower end surface of the side block (6) on the right side, and there is a gap between the right side block (6) and the right side of the wear-resistant ring (8).

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