Electromagnetic dynamic sealing device of rotary shaft system

Abstract

The utility model provides an electromagnetic dynamic sealing device of a rotary shaft system. The sealing device comprises an annular conductive groove, a graphite packing ring and an anti-abrasion ring. The annular conductive groove is fixed on the bearing seat, the graphite packing ring is arranged in the annular conductive groove, and because the graphite packing has the characteristics of good conductivity, self-lubricating property and small frictional resistance, the graphite packing is in direct contact with an anti-abrasion ring of a rotating shaft system and generates sliding friction, so that electromagnetic shielding dynamic sealing is realized.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic countermeasures technology, and in particular to an electromagnetic dynamic sealing device for a rotating shaft system. Background Technology

[0002] As electronic devices and systems become more and more prevalent, the integration and complexity of systems increase, the requirements for electromagnetic compatibility become more stringent, and the demand for protection against electromagnetic information leakage and electronic countermeasures is growing stronger.

[0003] For general electromagnetic compatibility requirements, corresponding solutions, products, and standards have been developed; however, there are currently no economical and practical solutions for electromagnetic leakage caused by gaps between moving parts of equipment and the resulting external radio frequency interference.

[0004] An ideal electromagnetic shield is a complete, continuous conductor. Typical optoelectronic devices are usually supported by azimuth and pitch axes. The azimuth axis ensures the device's circumferential movement, and the pitch axis ensures its vertical movement. Gaps in the azimuth and pitch rotation mechanisms become the main paths for internal radiation and external radio frequency interference. Current main solutions include the following:

[0005] The first approach uses an electromagnetic labyrinth design. To achieve good results, 6-7 labyrinths are typically required. However, due to limitations in equipment structure space and manufacturing precision, actual designs can only incorporate 2-3 electromagnetic labyrinths, resulting in poor electromagnetic shielding and sealing.

[0006] The second approach uses a magnetohydrodynamic (MHD) design. While MHDs can meet the needs of general applications, their electromagnetic shielding and dynamic sealing effects are generally limited, and they exhibit significant electromagnetic leakage at certain frequency bands. Furthermore, MHDs suffer from a sharp increase in rotational resistance at low temperatures. Additionally, MHDs are relatively expensive.

[0007] The third method involves placing flexible conductive materials such as conductive foam at the rotation gap, which can achieve good results in the short term. However, the conductive foam has poor wear resistance. On the one hand, the electromagnetic sealing effect deteriorates after wear. On the other hand, dust particles generated by friction adhere to optical components or electronic components, affecting equipment performance or safety. Utility Model Content

[0008] In view of the above-mentioned problems existing in the prior art, the present invention provides an electromagnetic dynamic sealing device for a rotary shaft system.

[0009] An electromagnetic dynamic sealing device for a rotating shaft includes an annular conductive groove, an anti-wear ring, and a graphite packing ring. The annular conductive groove is fixed on a bearing housing, and the graphite packing ring is disposed inside it. The groove size of the annular conductive groove is such that the graphite packing ring is below the groove opening and has an appropriate amount of compression after installation.

[0010] The annular conductive groove can be a separate part or it can be formed by slotting in a rotating shaft system structure.

[0011] The anti-wear ring rotates relative to the annular conductive groove. The anti-wear ring has protrusions as friction surfaces for elastic contact with the graphite packing ring. The surface of the anti-wear ring is smoothed, with a roughness Ra not exceeding 0.4.

[0012] The anti-wear ring can be a separate part, or it can be formed by conductive hardening and smoothing treatment at a corresponding position in the rotating shaft system structure. Preferably, the anti-wear ring is formed by modifying the rotating flange.

[0013] The anti-wear ring is made of wear-resistant materials, including titanium alloy and bearing steel.

[0014] The two ends of the graphite packing ring are connected by internal metal wire clamps.

[0015] A method for installing an electromagnetic dynamic sealing device for a rotating shaft, characterized in that,

[0016] Step 1: Install an annular conductive groove on the rotating shaft system;

[0017] Step 2: Install the graphite packing ring into the annular conductive groove;

[0018] Step 3: Install the anti-wear ring and rotating flange onto the rotating shaft system.

[0019] Compared with the prior art, the electromagnetic dynamic sealing device for a rotary shaft system provided in this embodiment of the utility model solves the problem of electromagnetic shielding dynamic sealing of the rotary shaft system structure, prevents the leakage of electromagnetic information inside the equipment to the outside, and blocks external radio frequency interference to the inside of the equipment.

[0020] With its simple design, low cost, good performance, high durability, no frictional dust, strong environmental adaptability, and strong versatility, this product can be widely used for electromagnetic shielding and dynamic sealing between rotary or reciprocating motion mechanisms. It improves the electromagnetic compatibility performance and anti-electromagnetic interference capabilities of equipment, and saves on electromagnetic compatibility testing and rectification costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a typical rotary shaft system.

[0022] Figure 2 A schematic diagram of a typical rotary shaft system structure for adding a rotary shaft system sealing device;

[0023] Figure 3 Schematic diagram of the sealing device for the rotary shaft system;

[0024] Figure 4 Schematic diagram of annular conductive groove structure;

[0025] Figure 5 Schematic diagram of the anti-wear ring structure;

[0026] Figure 6 Schematic diagram of graphite packing ring structure;

[0027] Figure 7 Schematic diagram of the installation of the annular conductive groove;

[0028] Figure 8 Schematic diagram of graphite packing ring installation;

[0029] Figure 9 Schematic diagram of the installation of the rotating flange and anti-wear ring;

[0030] Figure 10 Schematic diagram of the completed installation of the sealing device for the rotary shaft system.

[0031] Figure Labels

[0032] 1. Shaft; 2. Rotating flange; 3. Bearing housing; 4. Sealing ring; 5. Housing; 6. Annular conductive groove; 7. Anti-wear ring; 8. Graphite packing ring. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Figure 1 A schematic diagram of a typical rotating shaft system is given, which mainly includes a rotating shaft 1, a rotating flange 2, a bearing housing 3, a sealing ring 4, and a housing 5.

[0035] Figure 2 A schematic diagram of a typical rotary shaft system structure with an added sealing device is provided. Figure 3 A schematic diagram of the rotary shaft sealing device of this utility model is provided, which mainly includes an annular conductive groove 6, an anti-wear ring 7, and a graphite packing ring 8.

[0036] An annular conductive groove 6 is fixed on the bearing housing 3, and a graphite packing ring 8 is installed inside. Due to the good conductivity, self-lubricating properties and low frictional resistance of the graphite packing, it directly contacts the anti-wear ring 7 of the rotating shaft system and generates sliding friction, thereby achieving electromagnetic shielding dynamic sealing.

[0037] When designing and fabricating the annular conductive groove 6, the groove dimensions must ensure that the graphite packing ring is below the groove opening after installation and has an appropriate amount of compression. The annular conductive groove 6 can be designed as a separate part, or the groove can be directly cut into the existing equipment structural components. A schematic diagram of the annular conductive groove 6 can be found here. Figure 4 ;

[0038] The anti-wear ring 7, which rotates relative to the annular conductive groove 6, is made of wear-resistant materials such as titanium alloy or bearing steel, and has appropriate protrusions designed at corresponding positions to ensure elastic contact with the graphite packing ring 8 inside the annular conductive groove 6 after installation. The surface of the anti-wear ring 7 is smoothed, with a roughness Ra not exceeding 0.4. The anti-wear ring 7 can also be designed as a separate part, or it can be used to conduction harden and smooth the original equipment structural parts to increase its wear resistance and smoothness. A schematic diagram of the anti-wear ring 7 is shown below. Figure 5 ;

[0039] In one embodiment, since the rotating flange 2 is made of titanium alloy, it has strong wear resistance. The anti-wear ring 7 is achieved by modifying the rotating flange 2. A small boss with a height of 1mm and a width of 3mm is designed on the rotating flange 2, and the surface roughness Ra is not greater than 0.4. Electromagnetic shielding is achieved by the sliding friction between this surface and the graphite packing ring.

[0040] Cut a graphite packing ring to a length of 6 circumference from the annular conductive groove, and connect the two ends with internal metal wires to obtain the graphite packing ring 8. Graphite packing ring 8 can also be custom-made. A schematic diagram of graphite packing ring 8 can be found here. Figure 6 .

[0041] The equipment is assembled with annular conductive groove 6, graphite packing ring 8 and anti-wear ring 7. The parallelism and pressure of the rotating structural components are adjusted to meet the electromagnetic shielding dynamic sealing requirements and resistance torque limits.

[0042] In another embodiment, the installation method of the rotary shaft system sealing device is as follows: Figures 7-10 As shown.

[0043] Step 1: Install the annular conductive groove 6 on the rotating shaft system;

[0044] Step 2: Install the graphite packing ring 8 into the annular conductive groove 6;

[0045] Step 3: Install the anti-wear ring 7 and the rotating flange 2 onto the rotating shaft system.

[0046] If the anti-wear ring 7 is obtained by modifying the rotating flange 2, or the annular conductive groove 6 is obtained by slotting on the original equipment structural parts, then the above steps should be adjusted accordingly.

[0047] The above embodiments are merely exemplary embodiments of this utility model and are not intended to limit this utility model. The scope of protection of this utility model is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this utility model within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this utility model.

Claims

1. A rotary shaft electromagnetic dynamic sealing device, characterized in that, Includes annular conductive grooves, anti-wear rings, and graphite packing rings; The annular conductive groove is fixed on the bearing seat, and the graphite packing ring is disposed inside it. The anti-wear ring rotates relative to the annular conductive groove. The anti-wear ring is provided with protrusions as friction surfaces for elastic contact with the graphite packing ring.

2. The electromagnetic dynamic sealing device for a rotary shaft system according to claim 1, characterized in that, The groove size of the annular conductive groove is such that after the graphite packing ring is installed, it is lower than the groove opening and has an appropriate amount of compression.

3. The electromagnetic dynamic sealing device for a rotary shaft system according to claim 1, characterized in that, The annular conductive groove is a separate component.

4. The electromagnetic dynamic sealing device for a rotary shaft system according to claim 1, characterized in that, The annular conductive groove can be formed by slotting in the rotating shaft system structure.

5. The electromagnetic dynamic sealing device for a rotary shaft system according to claim 1, characterized in that, The surface of the anti-wear ring is smoothed, and the roughness Ra is not greater than 0.

4.

6. The electromagnetic dynamic sealing device for a rotary shaft system according to claim 1, characterized in that, The anti-wear ring is a separate part.

7. The electromagnetic dynamic sealing device for a rotary shaft system according to claim 1, characterized in that, The wear-resistant ring is formed by performing conductive hardening and smoothing treatment at a corresponding position in the rotating shaft system structure, and is then modified on the rotating flange to form the wear-resistant ring.

8. The electromagnetic dynamic sealing device for a rotary shaft system according to claim 1, characterized in that, The two ends of the graphite packing ring are connected by internal metal wire clamps.

9. The electromagnetic dynamic sealing device for a rotary shaft system according to claim 6, characterized in that, The wear-resistant ring is made of a wear-resistant material, which is either titanium alloy or bearing steel.

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