Shafting seal structure

Abstract

The application discloses a shafting sealing structure, belongs to the technical field of shafting dynamic sealing of airborne photoelectric equipment, and is provided with a sealing ring, which is installed on a shafting fixing assembly; a flexible sealing piece, which is installed on a shafting rotating assembly; and a flexible brush, which is installed on the shafting rotating assembly and is used for supporting the flexible sealing piece, wherein the sealing ring is provided with a sealing body on the side of the shafting rotating assembly, the sealing body and the flexible sealing piece abut and contact in a form of lap joint, so that the flexible sealing piece and the flexible brush are elastically deformed to seal the shafting, and the application has the beneficial effects of smaller structural size and friction torque, convenient adjustment, and higher temperature adaptability.

Description

Technical Field

[0001] This invention relates to the field of dynamic sealing technology for shaft systems of airborne optoelectronic equipment, and in particular to a shaft sealing structure. Background Technology

[0002] Airborne optoelectronic equipment can detect, identify, track, and measure targets. It is widely used in sea-based and land-based mission systems. The optoelectronic equipment carries multiple payloads, which typically include infrared cameras, multispectral cameras, visible light cameras, lasers, and other precision mechanical components. It is quite sensitive to the working environment. For example, exposure to sand and dust or salt spray will seriously affect the transmission accuracy of the shaft system and the imaging performance of the system. In severe cases, it may even cause equipment damage. Therefore, effective shaft dynamic sealing design is required for the equipment.

[0003] Currently, the existing shaft dynamic seals are mainly sealing structures in the form of spring energy storage seal rings, which rely on the radial setting of the sealing structure. The spring energy storage seal ring is mainly composed of a sealing jacket and an internal metal energy storage spring. The sealing jacket is generally made of polytetrafluoroethylene or other high-performance polymer materials. The energy storage seal ring is installed in the sealing groove. When the spring is compressed, it generates elastic deformation force, which causes the sealing jacket to fit tightly against the sealing groove, thereby forming a seal.

[0004] To ensure effective sealing, the energy storage seal requires a certain preload from the spring, which creates a significant additional frictional torque on the shaft system, especially noticeable under low-temperature conditions, severely impacting the shaft's driving capability. The magnitude of this additional torque depends primarily on the spring preload and the surface roughness of the two relatively moving parts. While adjusting the spring preload by modifying the width of the sealing groove and increasing surface roughness can reduce the additional torque during actual assembly and adjustment, the energy storage seal is installed inside the shaft system, making assembly and disassembly inconvenient and requiring high-precision machining. Therefore, the control effect of adjusting the additional torque is limited. Furthermore, the energy storage seal requires a high clearance between the relatively moving parts of the shaft system, typically less than 0.1mm. When the equipment operates in high and low temperature environments, thermal expansion and contraction of the structural components can cause deformation exceeding this clearance value, leading to shaft interference and poor temperature adaptability. In addition, the energy storage seal occupies a large installation space, hindering the miniaturization of the shaft system.

[0005] Therefore, in view of the above problems, it is necessary for the present invention to provide a shaft sealing structure with small structural dimensions, small frictional torque, convenient adjustment, and higher temperature adaptability. Summary of the Invention

[0006] The purpose of this invention is to overcome the defects of the existing technology and provide a shaft sealing structure.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] This invention discloses a shaft sealing structure, comprising:

[0009] A sealing ring, which is installed on the shaft fixing assembly;

[0010] A flexible seal is mounted on the rotating shaft assembly;

[0011] A flexible brush is mounted on the shaft rotation assembly to support the flexible seal. The sealing ring is provided with a sealing body on the side of the shaft rotation assembly. The sealing body and the flexible seal are in contact with each other in an overlapping manner so as to compress the flexible seal and the flexible brush to produce elastic deformation to seal the shaft.

[0012] Furthermore, the sealing body has a mating surface that can penetrate into the mounting surface of the flexible seal and contact the sealing surface.

[0013] Furthermore, a ring-shaped boss is formed on the inner ring side surface of the sealing ring, and the boss forms a mating surface with a convex arc structure. The boss is the sealing body.

[0014] Furthermore, a deformation region is formed on the edge of the flexible brush away from the sealing body, so that the flexible seal and the flexible brush can enter the deformation region when deformed.

[0015] Furthermore, the flexible brush includes a ring-shaped body portion and a thin ring portion formed on the outer side of the body portion. A flexible structure is formed circumferentially at the outer edge of the thin ring portion to release stress and allow the thin ring portion to deform flexibly.

[0016] Furthermore, the flexible structure comprises a plurality of fine grooves, which are evenly distributed along the circumference of the thin ring portion and penetrate the thin ring portion.

[0017] Furthermore, the sealing ring, the flexible seal, and the flexible brush are all provided with a plurality of mounting holes, which are evenly distributed circumferentially, and the body of the flexible brush is provided with the mounting holes at the midpoint between two adjacent grooves.

[0018] Furthermore, the thickness of the thin ring portion is less than the thickness of the body portion, and the upper surface of the thin ring portion is coplanar with the upper surface of the body portion, which is used to support the flexible seal.

[0019] Furthermore, the sealing ring is a metal ring.

[0020] Furthermore, the sealing ring, the flexible seal, and the flexible brush are all installed at the end of the shaft system.

[0021] In the above technical solution, the shaft sealing structure provided by the present invention has the following advantages:

[0022] The shaft sealing structure designed in this invention has a sealing ring mounted on a fixed shaft assembly, and a flexible brush and a flexible seal mounted on a rotating shaft assembly. The flexible brush supports the flexible seal, and the sealing ring contacts the flexible seal in an overlapping manner through a sealing body, thereby compressing the flexible seal and the flexible brush to produce elastic deformation to seal the shaft. This shaft sealing structure has the following beneficial effects:

[0023] 1) The pre-tightening force is provided by the elastic deformation generated after the flexible brush is installed, which ensures that the flexible seal is tightly attached to the sealing ring and achieves a reliable seal. It has a lower additional friction torque, and the flexible parts are all made of non-metallic materials with a small coefficient of thermal expansion, so the friction torque is less affected by temperature changes.

[0024] 2) The pre-tightening effect can be adjusted by adjusting the thickness of the flexible brush thin ring, the number and width of the grooves, and the height of the sealing ring boss, so as to obtain the ideal sealing effect and friction torque;

[0025] 3) The annular boss structure of the sealing ring ensures that there is line contact or small surface contact between the sealing ring and the flexible seal. The small contact area can effectively reduce frictional torque and reduce losses.

[0026] 4) The shaft sealing structure is arranged along the axial direction. The flexible brush, flexible seal and sealing ring are all installed at the end of the shaft, which occupies less space and is easy to disassemble. When disassembling the sealing structure, there is no need to disassemble the shaft support, which is convenient for adjustment and has stronger adaptability to the machine. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0028] Figure 1 This is a schematic diagram of the overall structure of a shaft sealing structure disclosed in this invention;

[0029] Figure 2 This is a schematic diagram of a flexible brush structure for a shaft sealing structure disclosed in this invention;

[0030] Figure 3 This is a schematic diagram of a flexible sealing element for a shaft sealing structure disclosed in this invention;

[0031] Figure 4This is a schematic diagram of a metal ring structure for a shaft sealing structure disclosed in this invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Flexible brush; 2. Flexible seal; 3. Rotating assembly; 4. Fixed assembly; 5. Sealing ring;

[0034] 11. Body section; 12. Thin ring section; 13. First mounting hole; 14. Fine groove;

[0035] 21. Second mounting hole; 22. Sealing surface;

[0036] 51. Third mounting hole; 52. Boss; 53. Mating surface. Detailed Implementation

[0037] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0038] See Figure 1 As shown;

[0039] An invention discloses a shaft sealing structure, comprising:

[0040] The sealing ring 5 is mounted on the shaft fixing assembly 4;

[0041] Flexible seal 2 is mounted on shaft rotation assembly 3;

[0042] The flexible brush 1 is mounted on the shaft rotation assembly 3. Specifically, the flexible brush 1 is mounted on the lower part of the flexible seal 2 and contacts the surface of the flexible seal 2, thereby providing support for the flexible seal 2.

[0043] Among them, the sealing ring 5 is provided with a sealing body on the side of the shaft rotation assembly 3. The sealing body and the flexible sealing element 2 are in contact with each other in an overlapping manner, and the flexible sealing element 2 and the flexible brush 1 are compressed to make them elastically deformed, thereby achieving the sealing of the shaft system.

[0044] The stiffness of the flexible brush 1 combined with the flexibility of the flexible seal 2 results in a small coefficient of sliding friction between the flexible seal 2 and the sealing ring 5. The elastic deformation generated after the flexible brush 1 is installed provides a pre-tightening force to support the flexible seal 2, ensuring close contact between the flexible seal 2 and the sealing ring 5, and achieving reliable sealing of the shaft system.

[0045] See Figure 1 As shown:

[0046] Preferably, the sealing body has a mating surface 53, which can penetrate into the horizontal mounting surface of the flexible seal 2 and contact the sealing surface 22. In this structure, in the free state of the flexible seal 2, the sealing surface 22 is parallel to the horizontal plane. In the sealed state, the sealing surface 22 forms an inclined angle with the horizontal plane. The mating surface 53 can penetrate into the horizontal mounting surface of the flexible seal 2, and thus the mating surface 53 abuts against the sealing surface 22 and maintains a pre-tight contact with the sealing shaft system.

[0047] See Figure 4 As shown:

[0048] Preferably, the inner ring side surface of the sealing ring 5 is provided with a smoothly transitioned annular boss 52, the boss 52 forming a mating surface 53 with a convex arc structure, and the boss 52 is a sealing body.

[0049] In this structure, the sealing ring 5 is a metal ring, which can be made of wear-resistant metal materials such as stainless steel. The inner side of the sealing ring 5 is provided with a smoothly transitioned annular boss 52. The inner diameter of the boss 52 is smaller than the outer diameter of the flexible seal 2. The outer ring side of the sealing ring 5 is provided with a third mounting hole 51 for fixing. Through the third mounting hole 51, the sealing ring 5 can be fixed on the fixing component 4 and remain fixed during the operation of the equipment.

[0050] When the shaft components are assembled and installed in place, the sealing surface 22 of the flexible seal 2 and the mating surface 53 of the sealing ring 5 come into contact. The height of the end face of the mating surface 53 along the axial direction is higher than the height of the sealing surface 22 (i.e., the mounting surface). Due to the height difference, the installed flexible seal 2 and flexible brush 1 undergo elastic deformation, which keeps the flexible seal 2 and sealing ring 5 in pre-tight contact, thereby ensuring a seal.

[0051] See Figure 1 As shown:

[0052] Preferably, a deformation area is formed on the side of the edge of the flexible brush 1 away from the mating surface 53. By setting a deformation area at the lower part of the edge of the flexible brush 1, when the mating surface 53 of the sealing ring 5 and the sealing surface 22 of the flexible seal 2 are in pre-tight contact, the flexible seal 2 and the flexible brush 1 deform and enter the deformation area, which avoids interference between the flexible seal 2 and the flexible brush 1 and other components of the shaft system, reduces frictional torque, and provides good pre-tightening force and sealing effect.

[0053] See Figure 1 , 2As shown, in this structure, the flexible brush 1 is a stepped annular thin sheet structure, and the flexible seal 2 is an annular thin sheet structure. The flexible seal 2 is made of a non-metallic material with a low coefficient of friction and high flexibility, while the flexible brush 1 is made of a non-metallic material with high stiffness. More specifically, the flexible brush 1 can be made of materials such as G10 and PEEK in the existing technology, and the flexible seal 2 can be made of a wear-resistant non-metallic material with self-lubricating properties, such as polytetrafluoroethylene, which has a low coefficient of friction and can reduce the friction and wear of the sealing component.

[0054] See Figure 1 , 3 As shown, the flexible seal 2 and the flexible brush 1 have the same annular inner diameter and outer diameter. The flexible seal 2 is provided with a second mounting hole 21 for fixing, the number of which is the same as the number of the first mounting holes 13 on the flexible brush 1. The flexible seal 2 and the flexible brush 1 are fixed to the rotatable assembly 3 in sequence, and rotate together with the rotatable assembly 3 during the operation of the equipment.

[0055] See Figure 2 As shown:

[0056] Preferably, the flexible brush 1 includes a ring-shaped body portion 11 and a thin ring portion 12 formed on the outer side of the body portion 11. A flexible structure is formed circumferentially at the outer edge of the thin ring portion 12 to release stress, improve the flexibility of the thin ring portion 12, and make the thin ring portion 12 easy to generate elastic deformation. The stiffness and flexibility of the flexible brush 1 can be adjusted by changing the structural parameters of the flexible structure.

[0057] Preferably, the flexible structure consists of several fine grooves 14, which are evenly distributed around the thin ring portion 12 and penetrate the thin ring portion 12. The preload can be adjusted by controlling the thickness of the thin ring portion 12 of the flexible brush 1, the size and number of the fine grooves 14, and the height of the boss 52 of the sealing ring 5, so as to obtain the required sealing effect and friction torque. The body portion 11 of the flexible brush 1 is relatively thick, and a first mounting hole 13 for fixing is provided on the body portion 11. The first mounting hole 13 is a countersunk hole.

[0058] Preferably, the sealing ring 5, the flexible seal 2, and the flexible brush 1 are all provided with a number of mounting holes, which are evenly distributed circumferentially, and the body part 11 of the flexible brush 1 is provided with mounting holes at the position between two adjacent grooves 14.

[0059] In this structure, such as Figure 1 , 4As shown, the sealing ring 5 is installed on the shaft fixing assembly 4 through the third mounting hole 51. The flexible seal 2 and the flexible brush 1 are fixed on the shaft rotating assembly 3 through the second mounting hole 21 and the first mounting hole 13, respectively. The second mounting hole 21 and the first mounting hole 13 are in corresponding positions and matched in number. The first mounting hole 13 is sufficiently numerous and located in the middle position between two adjacent grooves 14, which can effectively prevent the flexible brush 1 from undergoing local bending deformation after fixing, resulting in uneven friction torque. In addition, the thin ring portion 12 of the flexible brush 1 is provided with through grooves 14. The grooves 14 are evenly distributed along the circumference. In actual use, the flexibility of the flexible brush 1 can be adjusted by controlling the thickness of the thin ring portion 12 and the number and width of the grooves 14 to obtain an ideal sealing effect.

[0060] See Figure 1 As shown:

[0061] Preferably, the thickness of the thin ring portion 12 is less than the thickness of the body portion 11, and the upper surface of the thin ring portion 12 is coplanar with the upper surface of the body portion 11 to support the flexible seal 2. In this structure, since the thickness of the thin ring portion 12 is less than the thickness of the body portion 11 of the flexible brush 1, a deformation area is formed in the lower part of the thin ring portion 12, which can prevent the flexible seal 2 and the flexible brush 1 from interfering with other components of the shaft system when they undergo elastic deformation.

[0062] Preferably, the sealing ring 5, the flexible seal 2, and the flexible brush 1 are all installed at the end of the shaft system, so that the shaft system structure such as bearings and motors does not need to be disassembled during disassembly, which facilitates adjustment;

[0063] In the above technical solution, the present invention provides a shaft sealing structure;

[0064] Installation method: During installation, first fix the sealing ring 5 to the mounting surface of the fixed component 4 through the third mounting hole 51. After installation, the height of the mating surface 53 is higher than the height of the mounting surface of the rotating component 3. Then, fix the flexible brush 1 and the flexible seal 2 to the mounting surface of the rotating component 3 by passing screws through the mounting holes of the flexible brush 1 and the flexible seal 2 in sequence. Due to the height difference between the mating surface 53 and the mounting surface of the flexible seal 2, the installed flexible seal 2 and the flexible brush 1 undergo elastic deformation, so that the sealing surface 22 of the flexible seal 2 and the mating surface 53 of the sealing ring 5 maintain pre-tight contact, thereby forming a seal.

[0065] Beneficial effects:

[0066] The shaft sealing structure designed in this invention has a sealing ring mounted on a fixed shaft assembly, and a flexible brush and a flexible seal mounted on a rotating shaft assembly. The flexible brush supports the flexible seal, and the sealing ring contacts the flexible seal in an overlapping manner through a sealing body, thereby compressing the flexible seal and the flexible brush to produce elastic deformation to seal the shaft. This shaft sealing structure has the following beneficial effects:

[0067] 1) The pre-tightening force is provided by the elastic deformation generated after the flexible brush is installed, which ensures that the flexible seal is tightly attached to the sealing ring and achieves a reliable seal. It has a lower additional friction torque, and the flexible parts are all made of non-metallic materials with a small coefficient of thermal expansion, so the friction torque is less affected by temperature changes.

[0068] 2) The pre-tightening effect can be adjusted by adjusting the thickness of the flexible brush thin ring, the number and width of the grooves, and the height of the sealing ring boss, so as to obtain the ideal sealing effect and friction torque;

[0069] 3) The annular boss structure of the sealing ring ensures that there is line contact or small surface contact between the sealing ring and the flexible seal. The small contact area can effectively reduce frictional torque and reduce losses.

[0070] 4) The shaft sealing structure is arranged along the axial direction. The flexible brush, flexible seal and sealing ring are all installed at the end of the shaft, which occupies less space and is easy to disassemble. When disassembling the sealing structure, there is no need to disassemble the shaft support, which is convenient for adjustment and has stronger adaptability to the machine.

[0071] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A shaft sealing structure, characterized in that, include: A sealing ring (5) is mounted on the shaft fixing assembly (4); A flexible seal (2) is mounted on the shaft rotation assembly (3); A flexible brush (1) is mounted on the shaft rotation assembly (3) to support the flexible seal (2). The sealing ring (5) is provided with a sealing body on the side of the shaft rotation assembly (3). The sealing body and the flexible seal (2) are in contact with each other in an overlapping manner so as to compress the flexible seal (2) and the flexible brush (1) to produce elastic deformation to seal the shaft. The flexible brush (1) includes a ring-shaped body portion (11) and a thin ring portion (12) formed on the outer side of the body portion (11). The thin ring portion (12) has a circumferentially formed flexible structure at its outer edge position to release stress and allow the thin ring portion (12) to deform flexibly.

2. The shaft sealing structure according to claim 1, characterized in that: The sealing body has a mating surface (53) that can penetrate into the mounting surface of the flexible seal (2) and contact the sealing surface (22).

3. The shaft sealing structure according to claim 2, characterized in that: The inner ring side of the sealing ring (5) has a ring-shaped boss (52) and a convex arc structure mating surface (53). The boss (52) is the sealing body.

4. The shaft sealing structure according to claim 1, characterized in that: The flexible brush (1) has a deformation area formed on the side away from the sealing body at its edge, so that the flexible seal (2) and the flexible brush (1) can enter the deformation area when they deform.

5. A shaft sealing structure according to claim 1, characterized in that: The flexible structure consists of several grooves (14), which are evenly distributed around the thin ring portion (12) and penetrate the thin ring portion (12).

6. A shaft sealing structure according to claim 5, characterized in that: The sealing ring (5), the flexible seal (2), and the flexible brush (1) are all provided with a number of mounting holes. The mounting holes are evenly distributed in the circumferential direction. The mounting holes are provided on the body part (11) of the flexible brush (1) at the position between two adjacent grooves (14).

7. A shaft sealing structure according to claim 1 or 4, characterized in that: The thickness of the thin ring portion (12) is less than the thickness of the body portion (11), and the upper surface of the thin ring portion (12) is coplanar with the upper surface of the body portion (11) to support the flexible seal (2).

8. A shaft sealing structure according to claim 1, characterized in that: The sealing ring (5) is a metal ring.

9. A shaft sealing structure according to claim 1, characterized in that: The sealing ring (5), the flexible seal (2), and the flexible brush (1) are all installed at the end of the shaft system.

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