High-reliability leakage-free rotary fluid connector

Abstract

The utility model relates to a rotary fluid connector with high reliability and no leakage, which comprises a fixed shell and a rotary shell, the connecting ends of the fixed shell and the rotary shell form rotary connection in a hole shaft mode, a sealing sleeve and a bearing are arranged on a step shaft of the rotary shell, the sealing sleeve is provided with double-side sealing, and a movable sealing ring is arranged on the inner side of the sealing sleeve and is in sealing contact with the step shaft. The sealing performance in the under-pressure rotating process is fully guaranteed through the arrangement of multi-stage sealing and the spring plug ring, the bearing is used as a rotating supporting assembly and matched with the sealing sleeve, reliable supporting is formed on the rotating shell, rotating resistance is reduced, and the positioning precision and coaxiality are improved. Abrasion caused by deflection in the rotating process is prevented, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of connectors, in particular to a highly reliable and leak-free rotary fluid connector. Background Art

[0002] A rotary connector assembly is a connector assembly responsible for transmitting liquid to rotating equipment. It is widely used in electronic radar, aviation, aerospace and other fields. It ensures that the equipment can rotate normally while transmitting liquid without leakage.

[0003] The main problems of rotary connectors at present are large shaking, short rotation life, and easy leakage of fluid. Figure 1 As shown, the traditional rotary connector uses two rows of steel balls 3 and O-rings 4 between the rotating shell 2 and the fixed shell 1 to achieve the rotation and sealing functions. The problems with this connector are: the O-ring is set between the two shells to ensure the rotary seal. Under pressure, the O-ring is squeezed, and the O-ring and the metal shell are severely worn during rotation, which is prone to leakage and has a short service life; the double rows of steel balls are used to achieve the rotation function. Due to the low matching accuracy of the steel balls, the shell will shake a lot during use, the coaxiality is low, resulting in severe rotation wear and leakage. Utility Model Content

[0004] In view of the defects of the existing technology, the utility model provides a highly reliable and leak-free rotary fluid connector, which adopts a sealing sleeve and a bearing to improve the coaxiality between the rotating shells, reduce wear, and achieve leakage-free rotation.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is:

[0006] A highly reliable and leak-free rotary fluid connector comprises a fixed shell and a rotating shell, both of which are provided with flow channels in the axial direction, wherein the connection end of the fixed shell is designed as a stepped hole, and the connection end of the rotating shell is designed as a stepped shaft rotatably connected to the stepped hole, with the side where the fixed shell is located being the left side, the left end of the stepped shaft being sleeved with a sealing sleeve, and the right end of the stepped shaft being sleeved with a bearing, wherein the sealing sleeve is provided with double-sided sealing, that is, a dynamic sealing ring is installed on the inner side of the sealing sleeve in sealing contact with the stepped shaft, and a static sealing ring is installed on the outer side of the sealing sleeve in sealing contact with the stepped hole.

[0007] The utility model adopts the form of double-sided sealing of the sealing sleeve and bearing fixation, and adopts two dynamic and static sealing interfaces to ensure sealing performance and achieve leakage-free rotation process; the steel balls are replaced by bearings to reduce rotational resistance, improve the coaxiality between the rotating shells, and prevent eccentricity from occurring, which may cause serious wear of the sealing parts.

[0008] Furthermore, the dynamic sealing ring is a flood seal ring installed on the inner wall of the sealing sleeve, and the static sealing ring is an O-ring installed on the outer wall of the sealing sleeve.

[0009] Furthermore, the pan-seal ring is composed of a stainless steel spring and a polymer outer sleeve.

[0010] Furthermore, the polymer is a polymer composed of polytetrafluoroethylene and graphite.

[0011] The use of the varnish ring fully guarantees the sealing performance and achieves leakage-free rotation. The use of graphite material in the varnish ring reduces the friction between the varnish ring and the housing, thereby reducing wear.

[0012] Furthermore, there are two sealing sleeves, which are arranged side by side, and each sealing sleeve is provided with double-sided seals.

[0013] On the one hand, the sealing sleeve can provide sealing performance, and on the other hand, it provides support for the left end of the rotating shell. Cooperating with the bearing on the right side, it is beneficial to improve the coaxiality between the two shells, reduce shaking, prevent eccentricity, and improve reliability.

[0014] Furthermore, the left end surface of the first sealing sleeve is in close contact with the side wall of the step hole, and the right end surface of the first sealing sleeve is in close contact with the second sealing sleeve.

[0015] Furthermore, the second sealing sleeve is a stepped sleeve with a smaller left side and a larger right side. The left end of the second sealing sleeve is provided with double-sided seals and the left end face is tightly against the first sealing sleeve. The right end face of the second sealing sleeve is tightly against the outer ring of the bearing from the left side for positioning the bearing.

[0016] The provision of the second sealing sleeve not only increases the sealing performance through multi-stage sealing, but also can position the bearing by utilizing its structural characteristics.

[0017] Furthermore, a positioning nut is installed on the step shaft between the sealing sleeve and the bearing, and the positioning nut is used to position the inner ring of the bearing from the left side.

[0018] Furthermore, a shoulder is provided on the stepped shaft located on the right side of the bearing, and the shoulder is used to position the inner ring of the bearing from the right side.

[0019] Furthermore, a bearing end cover is installed on the right side of the bearing. The bearing end cover is sleeved on the rightmost end of the step shaft and fixed to the right end face of the step hole through a screw assembly. The bearing end cover positions the outer ring of the bearing from the right side and protects the bearing.

[0020] A universal seal ring is installed on the inner side of the bearing end cover to achieve sealing contact between the bearing end cover and the stepped shaft.

[0021] A gasket is provided between the bearing end cover and the right end face of the step hole.

[0022] By arranging a gasket and a universal seal ring at the bearing end cover, the sealing performance at the end face is ensured.

[0023] Furthermore, there are two bearings, which are axially arranged side by side with no space between them.

[0024] The double bearing setting fully guarantees the precision of the rotating support and prevents the deflection and wear caused by the shaking of the shell.

[0025] Furthermore, a flange mounting surface is provided on the fixed shell, and a mounting hole is provided on the flange mounting surface for fixing and mounting the fixed shell.

[0026] Furthermore, the outsides of the non-rotating connection ends of the fixed shell and the rotating shell are respectively provided with external threads for realizing the connection between the connector and other components.

[0027] Beneficial effects:

[0028] The rotary fluid connector of the present invention divides a sealing interface into two dynamic and static interfaces by disposing a sealing sleeve between the two housings. At the same time, double-sided sealing is provided on the sealing sleeve, with an O-ring used on one side to achieve static sealing and a universal seal used on the other side to achieve rotary sealing. This effectively ensures the sealing reliability between the two housings under pressurized and rotating conditions. Compared with the existing sealing method of directly disposing an O-ring between the two housings, the rotary fluid connector can reduce the wear of the sealing ring and increase its service life.

[0029] The utility model uses bearings instead of steel balls for rotational support. Compared with steel balls, bearings have higher positioning accuracy, can reduce rotational resistance, effectively improve the coaxiality of the shell, and reduce shaking. In addition, the use of two bearings arranged side by side can save space and have a compact structure while fully ensuring support reliability.

[0030] The sealing sleeve of the utility model not only realizes the sealing performance, but also provides a certain supporting function. The sealing sleeve is at the left end of the step shaft and, in combination with the bearing at the right end, forms a support for the step shaft, which is beneficial to improve the coaxiality between the two shells, prevent deflection, and reduce shaking during the rotation process.

[0031] The use of a universal ring rotary seal and bearing fixation can reduce friction and increase rotational life; using bearings to replace the steel balls in the existing technology can reduce rotational resistance, improve the coaxiality between the rotating shells, prevent eccentricity that causes severe wear of sealing parts, increase the service life of parts, and reduce leakage.

[0032] The connection is sealed with a multi-stage universal seal to prevent leakage during rotation. The end cap is equipped with a gasket and universal seal to effectively prevent dust and rain from entering the connector. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of a prior art rotary connector (depressurized state);

[0034] Figure 2 A schematic structural diagram of a rotary fluid connector according to the present invention.

[0035] Reference numerals:

[0036] 1. Fixed housing, 101. Flange mounting surface, 102. Mounting hole;

[0037] 2. Rotating housing, 3. Steel balls, 4. O-rings, 5. Sealing sleeve, 51. First sealing sleeve, 52. Second sealing sleeve; 6. Universal seal ring, 7. Positioning nut, 8. Bearing, 9. Bearing end cover, 10. Screws, 11. Gasket. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in this specification for the understanding and reading of those familiar with this technology, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any structural modifications, changes in proportions, or adjustments in size, as long as they do not affect the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention.

[0039] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "middle", "inside", and "outside" cited in this specification are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may refer to, for example, fixed connections, detachable connections, interfering connections, or integrated connections. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0041] like Figure 2As shown, in this embodiment, the rotary fluid connector includes a fixed shell 1 and a rotating shell 2, and flow channels are provided inside the fixed shell 1 and the rotating shell 2 along the axial direction. During the connection, the fixed shell 1 mainly plays a fixing and limiting role, and the rotating shell 2 is connected to the fixed shell 1 as a rotating shaft and cooperates with the seal to perform sealing. The front end of the fixed shell 1 (the end connected to the rotating shell 2) is designed in the form of a stepped hole, and the front end of the rotating shell 2 (the end connected to the fixed shell 1) is designed in the form of a stepped shaft. The rotary connection of the fixed shell 1 and the rotating shell 2 is achieved through the connection of the stepped hole and the stepped shaft.

[0042] In order to more clearly illustrate the solution of this embodiment, the side where the fixed shell 1 is located in the figure is defined as the left side, and the side where the rotating shell 2 is located is defined as the right side. A sealing sleeve 5, a positioning nut 7, a bearing 8 and a bearing end cover 9 are sequentially provided on the stepped shaft of the rotating shell 2 from left to right.

[0043] The sealing sleeve 5 is disposed at the left end of the stepped shaft, radially between the stepped hole and the stepped shaft. It provides support and seals the stepped shaft in conjunction with the sealing element. In this embodiment, the sealing sleeve 5 is designed to be double-sided, meaning corresponding seals are provided on both the inside and outside of the sealing sleeve 5. A dynamic seal is provided on the inside of the sealing sleeve 5 to achieve sealed contact with the stepped shaft, while a static seal is provided on the outside of the sealing sleeve 5 to achieve sealed contact with the stepped hole. Corresponding sealing measures are implemented at the two interfaces where the sealing sleeve 5 contacts the stepped shaft and the stepped hole.

[0044] The dynamic seal typically uses a Variseal ring 6, a well-known high-performance seal used to achieve a rotary seal between parts (i.e., dynamic seal). It primarily consists of an internal spring and an external U-shaped outer sleeve. Driven by the internal spring, the two lips of the U-shaped outer sleeve adhere tightly to the groove side (mounting groove) and the sliding surface, respectively, to achieve a seal. The spring in the Variseal ring 6 provides the load required for sealing under low pressure, while the U-shaped outer sleeve allows fluid pressure to exert force on the sealing lips. Therefore, as operating pressure increases, the deformation of the Variseal ring 6 increases, raising the overall sealing pressure and enhancing sealing capability.

[0045] In this embodiment, the spring of the Variseal ring 6 is made of stainless steel, and the U-shaped outer sleeve is made of a polymer composed of polytetrafluoroethylene and graphite. This provides a seal while also utilizing the properties of graphite to reduce friction. The Variseal ring 6 is installed in a mounting groove on the inner wall of the sealing sleeve 5, with the U-shaped opening facing the left side (i.e., the side toward the stationary housing).

[0046] The static sealing ring in this embodiment is generally an O-ring 4 , which realizes a fixed sealing function (ie, static sealing) between parts and is installed in a sealing groove on the outer wall of the sealing sleeve 5 .

[0047] This embodiment, by disposing a sealing sleeve 5 between the stationary housing 1 and the rotating housing 2, transforms the sealing interface between the stationary housing 1 and the rotating housing 2 into two separate sealing interfaces: dynamic and static. This separate sealing method fully ensures sealing performance during rotation, reduces wear, and increases the service life of the sealing ring. When the stepped shaft at the front end of the rotating housing 2 is installed in the stepped hole of the stationary housing 1, the sealing sleeve 5 is positioned between the stepped hole and the stepped shaft. The universal seal 6 seals against the stepped shaft, and the O-ring 4 seals against the stepped hole. When the rotating housing 2 rotates, this double-sided sealing structure, with its dynamic and static separation, fully ensures that the internal fluid is leak-free.

[0048] Furthermore, in this embodiment, two sealing sleeves 5 are provided, and the two sealing sleeves 5 are arranged side by side. The left end face of the first sealing sleeve 51 abuts against the side wall of the stepped hole, and the right end face of the first sealing sleeve 51 abuts against the second sealing sleeve 52. The first sealing sleeve 51 is respectively installed with a Variseal ring 6 and an O-ring 4 on the inner and outer sides. The second sealing sleeve 52 is a stepped sleeve with a smaller left end and a larger right end. The left end of the second sealing sleeve 52 is provided with a double-sided seal (i.e., a Variseal ring 6 is installed on the inner side and an O-ring 4 is installed on the outer side), and the left end face abuts against the first sealing sleeve 51. The right end face of the second sealing sleeve 52 abuts against the outer ring of the bearing 8 from the left side to position the bearing 8. The design of the double sealing sleeves 5 can further improve the sealing performance and ensure no leakage under the rotating pressurized state.

[0049] An external thread is provided on the stepped shaft between the sealing sleeve 5 and the bearing 8, and a positioning nut 7 is connected to the external thread. By tightening the positioning nut 7, its position on the stepped shaft is adjusted so that it presses against the inner ring of the bearing 8 from the left side to achieve the positioning of the bearing 8.

[0050] Furthermore, two bearings 8 are provided in this embodiment, and the two bearings 8 are arranged side by side without any spacing on the stepped shaft (in this case, the left side of the bearing refers to the left side of the left bearing, and the right side of the bearing refers to the right side of the right bearing), realizing rotational support. Compared with the traditional steel ball support method, the matching accuracy is high, which can ensure the balanced force of the shell, improve the coaxiality, prevent shaking and deflection, reduce rotational wear, and at the same time save axial space and reduce the volume of the connector.

[0051] A shoulder is provided on the stepped shaft at the right end of the bearing 8, which can realize axial positioning of the inner ring of the bearing 8 from the right side.

[0052] A bearing end cap 9 is mounted on the right end of bearing 8. This cap fits over the rightmost end of the stepped shaft and is secured to the right end face of the stepped hole via screws 10. This cap not only limits the outer ring of bearing 8 from the right side but also provides protection. A gasket 11 is positioned between the cap 9 and the stepped hole to prevent dust. A Variseal ring 6 is mounted on the inner wall of the cap 9 where it contacts the stepped shaft. Its U-shaped opening faces rightward (i.e., toward the rotating housing), ensuring a seal between the cap 9 and the stepped shaft, preventing rainwater and other contaminants from entering the connector.

[0053] Furthermore, the fixed housing 1 is provided with a flange mounting surface 101, which is provided with mounting holes 102 to facilitate installation of the fixed housing 1 in the corresponding position. The non-rotating connection ends of the fixed housing 1 and the rotating housing 2 are respectively provided with external threads for connecting other components of the rotary fluid connector.

[0054] When assembling the above-mentioned rotary fluid connector, the bearing end cover 9, bearing 8, positioning nut 7, and sealing sleeve 5 are first installed at the corresponding positions on the stepped shaft of the rotating shell 2. At this time, the axial position of the inner ring of the bearing 8 on the stepped shaft has been limited by the shaft shoulder and the positioning nut 7. Then the stepped shaft is inserted as a whole into the stepped hole on the fixed shell 1. After installation, the left end face of the first sealing sleeve 51 is tightly against the side wall of the stepped hole, and the right end face of the second sealing sleeve 52 is correspondingly tightly against the outer ring of the left bearing 8. Then the bearing end cover 9 is further fixed to the right end face of the stepped hole by the screw 10. At this time, the outer ring of the right bearing 8 is tightly pressed by the bearing 8 end cover, completing the positioning of the bearing and the assembly of the rotary fluid connector; at the connection interface on the left, two sealing sleeves 5 and a double-sided sealing method are provided to ensure that the internal fluid is leak-free; on the right, the dust and rainproof functions are ensured by the setting of the bearing end cover 9, gasket 11 and universal seal 6 to prevent external dirt from entering the connector.

[0055] During the start-up, rotation, and shutdown of the rotary connector, dual bearings 8 provide support and force (high coaxiality prevents the rotating housing from wobbling). This ensures that uneven forces on the housing prevent uneven forces on the sealing surfaces, leading to severe wear and shortened service life. A multi-stage universal seal design provides sealing during rotation, ensuring that the two housings of the rotary connector are leak-free, both during rotation and at rest. The structure of this utility model ensures high reliability and leak-free operation of the rotary fluid connector, while also extending its service life.

[0056] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A highly reliable and leak-free rotary fluid connector, comprising a fixed housing (1) and a rotating housing (2), both of which have flow channels arranged axially therein, wherein: The rotating connection end of the fixed housing (1) is designed as a stepped hole, and the rotating connection end of the rotating housing (2) is designed as a stepped shaft that is rotatably connected to the stepped hole, with the side where the fixed housing (1) is located being the left side. It is characterized in that the left end of the stepped shaft is sleeved with a sealing sleeve (5), and the right end of the stepped shaft is sleeved with a bearing (8), wherein the sealing sleeve (5) is provided with double-sided sealing, that is, a dynamic sealing ring is installed on the inner side of the sealing sleeve (5) in sealing contact with the stepped shaft, and a static sealing ring is installed on the outer side of the sealing sleeve (5) in sealing contact with the stepped hole.

2. A highly reliable and leak-free rotary fluid connector according to claim 1, characterized in that: The dynamic sealing ring is a universal seal ring (6) installed on the inner wall of the sealing sleeve (5), and the static sealing ring is an O-ring (4) installed on the outer wall of the sealing sleeve (5).

3. A highly reliable and leak-free rotary fluid connector according to claim 2, characterized in that: The pan seal ring (6) is composed of a stainless steel spring and a polymer outer sleeve.

4. A highly reliable and leak-free rotary fluid connector according to claim 3, characterized in that: The polymer is a polymer composed of polytetrafluoroethylene and graphite.

5. A highly reliable and leak-free rotary fluid connector according to claim 1, characterized in that: There are two sealing sleeves (5), which are arranged side by side, and each sealing sleeve (5) is provided with double-side seals.

6. A highly reliable and leak-free rotary fluid connector according to claim 5, characterized in that: The left end surface of the first sealing sleeve (51) is in close contact with the side wall of the step hole, and the right end surface of the first sealing sleeve (51) is in close contact with the second sealing sleeve (52).

7. A highly reliable and leak-free rotary fluid connector according to claim 6, characterized in that: The second sealing sleeve (52) is a stepped sleeve with a smaller left side and a larger right side. The left end of the second sealing sleeve (52) is provided with double-side seals and the left end face is tightly against the first sealing sleeve (51). The right end face of the second sealing sleeve (52) is tightly against the outer ring of the bearing from the left side for positioning the bearing (8).

8. A highly reliable and leak-free rotary fluid connector according to claim 1, characterized in that: A positioning nut (7) is installed on the stepped shaft between the sealing sleeve (5) and the bearing (8), and the positioning nut (7) is used to position the inner ring of the bearing (8) from the left side.

9. A highly reliable and leak-free rotary fluid connector according to claim 8, characterized in that: A shaft shoulder is provided on the stepped shaft located on the right side of the bearing (8), and the shaft shoulder is used to position the inner ring of the bearing (8) from the right side.

10. A highly reliable and leak-free rotary fluid connector according to claim 9, characterized in that: A bearing end cover (9) is installed on the right side of the bearing (8). The bearing end cover (9) is sleeved on the rightmost end of the step shaft and fixed to the right end surface of the step hole by a screw (10). The bearing end cover (9) positions the outer ring of the bearing (8) from the right side and protects the bearing (8).

11. A highly reliable and leak-free rotary fluid connector according to claim 10, characterized in that: A universal seal ring (6) is installed on the inner side of the bearing end cover (9) to achieve sealing contact between the bearing end cover (9) and the stepped shaft.

12. A highly reliable and leak-free rotary fluid connector according to claim 10, characterized in that: A gasket (11) is provided between the bearing end cover (9) and the right end surface of the step hole.

13. A highly reliable and leak-free rotary fluid connector according to any one of claims 8 to 12, characterized in that: There are two bearings (8), which are arranged side by side in the axial direction with no spacing between them.

14. A highly reliable and leak-free rotary fluid connector according to claim 1, characterized in that: A flange mounting surface (101) is provided on the fixed housing (1), and a mounting hole (102) is provided on the flange mounting surface (101) for fixing and mounting the fixed housing (1).

15. The highly reliable and leak-free rotary fluid connector according to claim 1, characterized in that: The non-rotating connection ends of the fixed housing (1) and the rotating housing (2) are respectively provided with threaded connection parts on their exteriors for realizing connection with other components.

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