Rotary sealing joint

Abstract

The utility model discloses a rotary sealing joint, which relates to the technical field of sealing elements and comprises an end connecting sleeve, the lower end of the end connecting sleeve is fixedly connected with a positioning plate through a screw, the upper end of the positioning plate is fixedly connected with a first bearing, and the upper end of the first bearing is fixedly connected with a bearing gasket. By means of the interference design that the upper bearing and the lower bearing are matched with the stepped installation groove, radial run-out of the rotating shaft during rotation can be effectively reduced, an elastic sealing structure is formed by the inclined spring and the framework, dynamic pre-tightening force is provided through the inclined spring, the framework sealing ring is made to adapt to deviation of the rotating shaft in a self-adaptive mode, and the rotating shaft is prevented from being damaged. Stable sealing can be kept in the reciprocating rotation of the rotating shaft, the adaptability of the rotary sealing joint to a high-dynamic load scene is improved, meanwhile, bearing lubricating grease can be effectively prevented from permeating into a fluid channel through a gap, and the requirement for pollution-free transmission of clean environments such as medical treatment and food can be met.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, specifically to a rotary sealing joint. Background Technology

[0002] Rotary sealing joints are key components for fluid transfer between rotating and stationary parts, and are widely used in robotics, automation equipment, and precision machinery.

[0003] Traditional rotary sealing joints often use a single bearing to support the shaft. High-speed rotation of the shaft can easily cause radial runout, leading to increased wear on the sealing surface and thus increasing the leakage rate. Traditional rotary sealing joints rely on static sealing rings for sealing, which are difficult to adapt to axial displacement under reciprocating rotation conditions. Furthermore, bearing grease can easily seep into the fluid channel through the gap, making it difficult to meet the requirements of clean environments such as medical and food industries for pollution-free transmission. Therefore, a rotary sealing joint is proposed to solve the problems mentioned above. Utility Model Content

[0004] To address the aforementioned technical problems, a rotary sealing joint is provided. This technical solution solves the problems mentioned in the background art, where traditional rotary sealing joints often use a single bearing to support the rotating shaft. High-speed rotation of the shaft easily generates radial runout, leading to increased wear on the sealing surface and thus increasing the leakage rate. Traditional rotary sealing joints often rely on static sealing rings for sealing, which are difficult to adapt to axial displacement under reciprocating rotation conditions. Furthermore, bearing grease can easily seep into the fluid channel through the gap, making it difficult to meet the requirements of clean environments such as medical and food industries for pollution-free transmission.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A rotary sealing joint includes an end connecting sleeve. A positioning plate is fixedly connected to the lower end of the end connecting sleeve by screws. A first bearing is fixedly connected to the upper end of the positioning plate. A bearing washer is fixedly connected to the upper end of the first bearing. A second bearing is fixedly connected to the upper end of the bearing washer. A support sleeve is fixedly connected to the upper end of the second bearing. A stepped mounting groove is formed at the lower end of the end connecting sleeve, and a connecting hole is formed at the upper end of the end connecting sleeve. The stepped mounting groove and the connecting hole communicate with each other. A sealing ring mounting groove is formed inside the connecting hole, and a fluororubber sealing ring is embedded inside the sealing ring mounting groove. A rotating shaft is rotatably connected to the inner side of the support sleeve. An elastic sealing ring is provided between the rotating shaft and the end connecting sleeve on the upper side of the support sleeve.

[0007] Preferably, the rotating shaft is inserted into the inner ring of the first bearing and the second bearing.

[0008] Preferably, the outer surface of the rotating shaft is in radial contact with the inner rings of the first and second bearings in an interference fit.

[0009] Preferably, the elastic sealing ring includes a skeleton movably connected between the rotating shaft and the end connecting sleeve, and a shear spring is embedded inside the skeleton.

[0010] Preferably, the first bearing, bearing washer, second bearing, and support sleeve are all inserted into the stepped mounting groove.

[0011] Preferably, the radial contact between the first bearing, bearing washer, second bearing, and support sleeve and the inner wall of the stepped mounting groove is an interference fit.

[0012] The advantages of this utility model compared with the prior art are:

[0013] This solution proposes a rotary sealing joint. By setting two bearings with an interference fit in the stepped mounting groove, the radial runout during shaft rotation can be effectively reduced. The elastic sealing structure composed of the inclined spring and the skeleton provides dynamic preload through the inclined spring, allowing the skeleton sealing ring to adapt to the shaft offset. This ensures a stable seal during the reciprocating rotation of the shaft, improving the adaptability of the rotary sealing joint to high dynamic load scenarios. At the same time, it can effectively prevent bearing grease from seeping into the fluid channel through the gap, meeting the requirements of clean environments such as medical and food industries for pollution-free transmission. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the internal structure of the end-connecting sleeve in this utility model;

[0016] Figure 3 This is a schematic diagram of the elastic sealing ring in this utility model.

[0017] The numbers on the map are:

[0018] 1. End connecting sleeve; 2. Rotating shaft; 3. Positioning plate; 4. First bearing; 5. Bearing washer; 6. Second bearing; 7. Support sleeve; 8. Stepped mounting groove; 9. Connecting hole; 901. Sealing ring mounting groove; 902. Fluororubber sealing ring; 10. Elastic sealing ring; 1001. Skeleton; 1002. Inclined spring. Detailed Implementation

[0019] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0020] Reference Figures 1-3As shown, a rotary sealing joint includes an end connecting sleeve 1. The lower end of the end connecting sleeve 1 is fixedly connected to a positioning plate 3 by screws. The upper end of the positioning plate 3 is fixedly connected to a first bearing 4. The upper end of the first bearing 4 is fixedly connected to a bearing washer 5. The upper end of the bearing washer 5 is fixedly connected to a second bearing 6. The upper end of the second bearing 6 is fixedly connected to a support sleeve 7. The lower end of the end connecting sleeve 1 has a stepped mounting groove 8. The upper end of the end connecting sleeve 1 has a connecting hole 9. The stepped mounting groove 8 and the connecting hole 9 are connected. The inside of the connecting hole 9 has a sealing ring mounting groove 901. The inside of the sealing ring mounting groove 901 is fitted with a fluororubber sealing ring 902. The inner side of the support sleeve 7 is rotatably connected to a rotating shaft 2. An elastic sealing ring 10 is provided between the rotating shaft 2 and the end connecting sleeve 1 on the upper side of the support sleeve 7.

[0021] Furthermore, the connection hole 9 is used to connect with an external fluid supply pipeline. After the connection hole 9 is connected with the external fluid supply pipeline, the fluororubber sealing ring 902 fits tightly with the external fluid supply pipeline to form a static seal, which can prevent external impurities from entering the joint and prevent the transmission medium from leaking into the environment, thereby meeting the requirements for the transmission of clean fluid.

[0022] Furthermore, the rotating shaft 2 is inserted into the inner ring of the first bearing 4 and the second bearing 6, and the outer surface of the rotating shaft 2 is in radial contact with the inner ring of the first bearing 4 and the second bearing 6 in an interference fit.

[0023] Furthermore, the first bearing 4, bearing washer 5, second bearing 6, and support sleeve 7 are all inserted into the interior of the stepped mounting groove 8, and the radial contact between the first bearing 4, bearing washer 5, second bearing 6, and support sleeve 7 and the inner wall of the stepped mounting groove 8 is an interference fit.

[0024] Furthermore, the support sleeve 7 is interference-fitted into the uppermost section of the stepped mounting groove 8, with the upper end face supporting the elastic sealing ring 10 and the lower end face fitting against the outer ring of the second bearing 6. The first bearing 4 and the second bearing 6 are installed in the lower section of the stepped mounting groove 8, and the bearing washer 5 is located between the two bearings. The two bearings are arranged at intervals to form a rigid support system, which limits the movement of the rotating shaft 2, reduces the radial runout of the rotating shaft 2 when it rotates, and ensures the stability of the rotating shaft 2 when it rotates at high speed.

[0025] Furthermore, the upper end of the positioning plate 3 is fitted with the outer ring of the first bearing 4 to fix the lower end position of the bearing system, providing a stable mounting reference surface for the bearing system and preventing the bearing from shifting under axial force.

[0026] Furthermore, the rotating shaft 2, as the core component of the rotation, transmits torque and guides fluid through its internal channels.

[0027] Furthermore, the elastic sealing ring 10 includes a skeleton 1001 movably connected between the rotating shaft 2 and the end connecting sleeve 1, and a shear spring 1002 is embedded inside the skeleton 1001.

[0028] Furthermore, the elastic preload of the inclined spring 1002 in the elastic sealing ring 10 enables the skeleton 1001 to fit tightly against the rotating shaft 2. When the rotating shaft 2 undergoes radial displacement during rotation, the inclined spring 1002 can adaptively compensate for the displacement, maintain tight contact of the sealing surface, and maintain a stable seal.

[0029] Working principle: During use, the connecting hole 9 is connected to the external fluid supply pipeline. The fluororubber sealing ring 902 is tightly fitted with the external fluid supply pipeline to form a static seal, which can prevent external impurities from entering the joint and prevent the transmission medium from leaking into the environment, thereby meeting the requirements for the transmission of clean fluid. The double bearings are arranged at intervals to form a rigid support system, which limits the movement of the rotating shaft 2, reduces the radial runout of the rotating shaft 2 during rotation, and ensures the stability of the rotating shaft 2 when rotating at high speed. The elastic preload of the inclined spring 1002 in the elastic sealing ring 10 can make the skeleton 1001 fit tightly against the rotating shaft 2. When the rotating shaft 2 is radially offset during rotation, the inclined spring 1002 can adaptively compensate for the offset, maintain the tight contact of the sealing surface, and maintain a stable seal.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A rotary sealing joint, characterized in that, The device includes an end connecting sleeve (1), the lower end of which is fixedly connected to a positioning plate (3) by screws, the upper end of which is fixedly connected to a first bearing (4), the upper end of which is fixedly connected to a bearing washer (5), the upper end of which is fixedly connected to a second bearing (6), the upper end of which is fixedly connected to a support sleeve (7), the lower end of which is provided with a stepped mounting groove (8), the upper end of which is provided with a connecting hole (9), the stepped mounting groove (8) and the connecting hole (9) are connected, the connecting hole (9) is provided with a sealing ring mounting groove (901), the sealing ring mounting groove (901) is provided with a fluororubber sealing ring (902) embedded in the sealing ring mounting groove (901), the inner side of the support sleeve (7) is rotatably connected to a rotating shaft (2), and an elastic sealing ring (10) is provided between the rotating shaft (2) and the end connecting sleeve (1) on the upper side of the support sleeve (7).

2. A rotary sealing joint according to claim 1, characterized in that: The rotating shaft (2) is inserted into the inner ring of the first bearing (4) and the second bearing (6).

3. A rotary sealing joint according to claim 1, characterized in that: The outer surface of the rotating shaft (2) is in radial contact with the inner rings of the first bearing (4) and the second bearing (6) in an interference fit.

4. A rotary sealing joint according to claim 1, characterized in that: The elastic sealing ring (10) includes a skeleton (1001) movably connected between the rotating shaft (2) and the end connecting sleeve (1), and a shear spring (1002) is embedded inside the skeleton (1001).

5. A rotary sealing joint according to claim 1, characterized in that: The first bearing (4), bearing washer (5), second bearing (6) and support sleeve (7) are all inserted into the interior of the stepped mounting groove (8).

6. A rotary sealing joint according to claim 1, characterized in that: The first bearing (4), bearing washer (5), second bearing (6) and support sleeve (7) all have an interference fit in radial contact with the inner wall of the stepped mounting groove (8).

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