Variable-compression O-shaped ring dynamic sealing structure
Through the variable compression O-ring dynamic sealing structure, the combination of the cone sleeve and adjustment pad is used to dynamically adjust the sealing effect and friction torque, which solves the problems of high processing cost and poor interchangeability of the O-ring under a fixed-size design, and achieves a low-cost and high-adaptive sealing effect.
Patent Information
- Application Number
- CN202422119769.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-30
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-08-30
AI Technical Summary
The compression amount of the existing O-ring dynamic seal is designed to be fixed in size, resulting in high processing requirements, high cost and poor interchangeability, making it difficult to meet the optimal matching of sealing and friction torques of high-precision equipment.
The variable compression amount O-ring dynamic sealing structure is adopted, and the sealing effect and friction torque are dynamically adjusted by adjusting the thickness of the pad, including the rotation shaft, O-ring, cone sleeve and fixing frame. The taper hole of the taper sleeve and the adjustable thickness adjustment pad achieve flexible control of the compression amount.
The dynamic adjustment of sealing effect and friction torque with low cost and low processing requirements is achieved, and the interchangeability of O-rings and equipment adaptability is improved.
Smart Images
Figure CN223120617U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical fields of dynamic sealing and optoelectronic turntables, especially a structure using an O-ring for dynamic sealing. Background Technique
[0002] Rotating products usually involve dynamic sealing problems. O-ring dynamic sealing is widely used in practice due to its simple structure and low price.
[0003] Currently, for O-ring dynamic sealing, its compression amount generally adopts a fixed-size design. That is, once the parts are processed and the O-rings are purchased, the compression amount of the O-rings is determined, and the frictional torque and sealing effect of the dynamic sealing are determined.
[0004] Since the frictional torque and the sealing effect are a pair of contradictions, in order to achieve the best match, the relevant dimensional requirements must be very accurate under the fixed-size design. On the one hand, the processing requirements are high, time-consuming, and costly. On the other hand, the dimensional and tolerance requirements for O-rings are high, and the procurement cost is large.
[0005] For some precision instruments or products such as high-precision stable turntables, etc., they are very sensitive to torque. Therefore, the compression amount of the O-ring is very small, and even only a few wires of compression amount may be required. In the current national standard GB / T3452.1-2005 "O-Ring Rubber Seals for Hydraulic and Pneumatic Applications - Part 1: Dimensions and Tolerances", the minimum tolerance of the cross-sectional diameter of the O-ring is also 16 wires (±0.08). Obviously, the general O-rings cannot meet the requirements in this case. Blind custom processing or screening is neither reasonable nor economical. In order to achieve a reasonable fit, in fact, the mating parts are often ground according to the selected O-ring, but this will not only result in huge time costs but also make the O-ring lose its interchangeability. Content of the Utility Model
[0006] The purpose of the utility model is to provide a variable compression amount O-ring dynamic sealing structure, which solves the most important problem of controlling the compression amount in O-ring dynamic sealing and effectively deals with the contradiction between sealing and frictional torque.
[0007] The technical solution to achieve the purpose of the utility model is as follows: A variable compression amount O-ring dynamic sealing structure, characterized in that the O-ring dynamic sealing structure includes a rotating shaft, an O-ring, a tapered sleeve, an adjusting pad, and a fixing bracket; the rotating shaft is rotatably connected to the fixing bracket; the tapered sleeve is fixedly installed at the end of the shaft hole of the fixing bracket, the adjusting pad is fixed on the fixing bracket and is arranged between the tapered sleeve and the fixing bracket, there is a groove on the rotating shaft, and the O-ring is installed in the groove on the rotating shaft; the outer ring of the O-ring contacts the inner tapered hole of the tapered sleeve, and the hole of the tapered sleeve has a taper.
[0008] The tapered sleeve is of a T-shaped sleeve structure and is internally provided with a tapered hole.
[0009] The aperture of the tapered hole of the tapered sleeve is larger at the column end and smaller at the table end.
[0010] The adjusting pad includes a series of circular gaskets with different thicknesses, which are selected according to the frictional torque.
[0011] The adjusting pad is made of copper.
[0012] Compared with the prior art, the remarkable advantages of the present utility model are as follows:
[0013] (1) By changing the thickness of the adjusting pad, the present invention realizes the change of the compression amount of the O-ring, and further dynamically adjusts the sealing effect and frictional torque between the mutually rotating shaft and hole. The structure is simple and the operation is convenient.
[0014] (2) The present invention has low requirements for the O-ring. It only needs to meet the national standard, and has good interchangeability.
[0015] (3) The present invention has low requirements for part processing and low manufacturing cost. Description of the Drawings
[0016] Figure 1 It is a schematic diagram of a dynamic seal of an O-ring with variable compression amount according to the present invention. Detailed Embodiment
[0017] To better understand the solution of the present invention, the following will combine the attached Figure 1 , and describe the technical solution clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments, and should not be construed as a limitation to the present invention.
[0018] A dynamic seal structure of an O-ring with variable compression amount in this embodiment is used for rotational seal between a shaft and a hole; as Figure 1 shown, it includes a rotating shaft 1, an O-ring 2, a tapered sleeve 3, an adjusting pad 4, and a fixing bracket 5.
[0019] The rotating shaft 1 is rotatably connected to the fixing bracket 5 through a bearing. There is a groove on the rotating shaft 1, and the O-ring 2 is installed in the groove on the rotating shaft 1. The outer ring of the O-ring 2 contacts the inner tapered hole of the tapered sleeve 3, and the hole of the tapered sleeve 3 has a certain taper;
[0020] The tapered sleeve 3 is fixedly installed at the hole end of the fixing bracket 5. The tapered sleeve 3 is a T-shaped sleeve structure with a tapered hole inside.
[0021] The adjusting pad 4 is composed of a series of copper sheets with different thickness specifications. The thickness specifications of the copper sheets are not continuous and can be arranged and combined into multiple size series. The thickness of a single copper sheet is not more than 1 mm. The adjusting pad 4 is attached to the end face of the tapered sleeve 3 and fixed to the fixing bracket 5 with screws.
[0022] The O-ring 2 is a standard part.
[0023] The working principle of the variable compression amount O-ring dynamic sealing structure is as follows:
[0024] When the frictional torque between the O-ring 2 and the tapered sleeve 3 is too large, select an adjusting pad 4 with a larger thickness dimension. After fixing, the tapered sleeve 3 moves to the right along the axis. Since the tapered sleeve 3 has a tapered hole, obviously the compression amount of the O-ring 2 becomes smaller and the frictional torque decreases accordingly.
[0025] When the frictional torque between the O-ring 2 and the tapered sleeve 3 is too small, select an adjusting pad 4 with a smaller thickness dimension. After fixing, the tapered sleeve 3 moves to the left along the axis. Since the tapered sleeve 3 has a tapered hole, obviously the compression amount of the O-ring 2 becomes larger and the frictional torque increases accordingly.
Claims
1. A variable compression amount O-ring dynamic sealing structure, characterized in that, The O-ring dynamic seal structure includes a rotating shaft, an O-ring, a tapered sleeve, an adjusting pad, and a fixing bracket; the rotating shaft is rotatably connected to the fixing bracket; the tapered sleeve is fixedly installed at the end of the shaft hole of the fixing bracket, the adjusting pad is fixed on the fixing bracket and is arranged between the tapered sleeve and the fixing bracket, there is a groove on the rotating shaft, and the O-ring is installed in the groove on the rotating shaft; the outer ring of the O-ring contacts the inner tapered hole of the tapered sleeve, and the hole of the tapered sleeve has a taper.
2. The variable compression amount O-ring dynamic sealing structure according to claim 1, characterized in that, The tapered sleeve is a T-shaped sleeve structure with a tapered hole provided inside.
3. The variable compression amount O-ring dynamic sealing structure according to claim 2, characterized in that, The aperture of the tapered hole of the tapered sleeve is larger at the column end aperture and smaller at the table end aperture.
4. The variable compression amount O-ring dynamic sealing structure according to claim 2, wherein The adjusting pad includes a series of circular gaskets with different thicknesses, which are selected according to the frictional torque.
5. The variable compression amount O-ring dynamic seal structure according to claim 4, characterized in that, The material of the adjusting pad is copper.