A ceramic bush seal protection structure on a shaft

Abstract

The utility model relates to a kind of ceramic shaft sleeve sealing protection structure on shaft, including high-speed shaft, bearing seat and lower bearing cover, annular baffle is formed oil seal mounting groove on the lower bearing cover upper end face, four fluorine oil seal is placed in oil seal mounting groove, ceramic shaft sleeve is installed between the oil seal lip of four fluorine oil seal and high-speed shaft, shaft sleeve positioning ring is equipped with on high-speed shaft by connecting piece, shaft sleeve positioning ring includes annular sleeve and splicing block, ceramic shaft sleeve is provided with clamping groove, the splicing block of shaft sleeve positioning ring is located in the clamping groove of ceramic bearing, four fluorine washer is provided between shaft shoulder and ceramic shaft sleeve.The utility model replaces ordinary rubber framework oil seal with better four fluorine oil seal of hardness and wear resistance to seal protection to bearing, and install ceramic shaft sleeve of hardness and smoothness excellent on shaft, solve the problem of needing to be plated with chromium to shaft when using four fluorine oil seal and serious heat generation, increase the service life of oil seal, improve the reliability of bearing protection, also reduce the machining difficulty of shaft plating with chromium.

Description

Technical Field

[0001] This utility model relates to a bearing sealing and protection structure, and more particularly to a ceramic bushing sealing and protection structure on a shaft. Background Technology

[0002] In mechanical design, high-speed shafts typically use oil seals to protect bearings. In some special production environments, bearings may be completely immersed in materials, making proper sealing crucial. Current technology using ordinary rubber-reinforced oil seals suffers from rapid wear due to the high speed of the shaft, leading to loss of protection and allowing material to enter the bearing, causing seizure and damage. If PTFE oil seals, with their superior hardness and wear resistance, are used, the contact area between the high-speed shaft and the PTFE seal lip must be hard chrome plated; otherwise, grooves may be worn into the lip. Chrome plating of high-speed shafts presents two problems: first, the plating process generates various harmful pollutants, causing significant environmental pollution; second, the plating process requires high precision. Excessive chrome plating results in surface pitting and insufficient smoothness, leading to overheating and accelerated wear of the PTFE seal lip. Conversely, insufficient chrome plating fails to provide adequate protection.

[0003] Chinese utility model patent 200720194927.9 discloses an oil seal bushing, comprising: a ceramic bushing for installation on a shaft sealing portion of a sealing mounting seat, and a rubber oil seal for installation between the ceramic bushing and the shaft. This patent uses a ceramic bearing and a rubber oil seal for sealing. The rubber oil seal is positioned between the ceramic bearing and the shaft, with the shaft and rubber oil seal rotating synchronously while the ceramic bushing remains stationary. There is relative movement between the shaft and the ceramic bushing, requiring the sealing lip of the rubber oil seal to maintain tight contact with the surface of the ceramic bushing to achieve a seal. Simultaneously, continuous friction occurs between the two during movement. This patent still uses a common rubber oil seal for sealing protection, and due to its inherent characteristics, the rubber oil seal is prone to wear. Furthermore, there is no sealing component between the ceramic bushing and the sealing seat. This sealing structure is unsuitable for equipment with high sealing requirements or where the bearing may be immersed in materials during use. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a ceramic bushing sealing and protection structure on a shaft. This structure uses a PTFE oil seal with better hardness and wear resistance to replace the ordinary rubber skeleton oil seal for sealing and protecting the bearing. A ceramic bushing with excellent hardness and smoothness is installed on the shaft. This solves the problems of chrome plating of the shaft and severe heat generation when using PTFE oil seals. It increases the service life of the oil seal, improves the reliability of bearing protection, and reduces the processing difficulty of chrome plating the shaft.

[0005] The technical solution to the above-mentioned technical problems is: a ceramic bushing sealing and protection structure on a shaft, including a high-speed shaft, a bearing housing, and a lower bearing cover. The lower bearing cover is installed at the lower end of the bearing housing. The high-speed shaft passes through the bearing housing and the lower bearing cover. A bearing is installed between the bearing housing and the high-speed shaft. An annular baffle is provided on the upper end face of the lower bearing cover to form an oil seal mounting groove. A PTFE oil seal is installed in the oil seal mounting groove. A ceramic bushing is installed between the oil seal lip of the PTFE oil seal and the high-speed shaft. A bushing positioning ring is installed on the high-speed shaft below the ceramic bushing via a connector. The bushing positioning ring includes an annular sleeve and a plug-in block connected to the upper end of the annular sleeve. A slot is provided at the lower end of the ceramic bushing. The plug-in block of the bushing positioning ring is located in the slot of the ceramic bearing.

[0006] Furthermore, the high-speed shaft is provided with a shoulder, and a PTFE washer is provided between the shoulder and the ceramic bushing.

[0007] Furthermore, an O-ring is provided between the bearing housing and the lower bearing cover.

[0008] Furthermore, the connector is a set screw.

[0009] By adopting the above technical solution, this utility model has the following beneficial effects:

[0010] 1. Compared to ordinary rubber-reinforced oil seals, PTFE oil seals have superior aging and wear resistance, resulting in a longer service life. This invention uses a PTFE oil seal instead of an ordinary rubber-reinforced oil seal, installed on the bearing cap of a high-speed shaft. To address the need for chrome plating on the high-speed shaft after installing the PTFE oil seal, a ceramic bushing is installed between the high-speed shaft and the PTFE oil seal. This ceramic bushing replaces the high-speed shaft in direct contact with the PTFE oil seal, eliminating the need for chrome plating on the high-speed shaft, reducing processing difficulty, saving labor costs, and avoiding environmental pollution from chrome plating operations. Furthermore, the high hardness and surface finish of the ceramic bushing reduce heat generation and wear on the PTFE oil seal during high-speed shaft rotation, thus improving the oil seal's service life and the reliability of bearing protection.

[0011] 2. The ceramic bushing is mounted on the high-speed shaft via a bushing locating ring. The locating ring is secured to the high-speed shaft with set screws. The ceramic bushing has a groove, and the locating ring has an insertion block. The locating ring and the ceramic bushing engage in a plug-in fit, ensuring synchronous rotation between the ceramic bushing and the high-speed shaft. This prevents friction between the ceramic bushing and the PTFE oil seal, which could cause relative movement and wear on the high-speed shaft. Using a bushing locating ring to mount the ceramic bushing is simple in structure and easy to install.

[0012] The technical features of a shaft-mounted ceramic bushing sealing and protection structure of this utility model will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0013] Figure 1 : A schematic diagram of a shaft-mounted ceramic bushing sealing and protection structure according to this utility model ( Figure 2 (Enlarged view of part A).

[0014] Figure 2 : Schematic diagram of a high-speed disperser equipped with this utility model.

[0015] In the diagram: 1-Bearing, 2-O-ring, 3-Lower bearing cover, 31-Annular baffle, 4-Shaft sleeve positioning ring, 41-Plug-in block, 42-Annular sleeve, 5-High-speed shaft, 6-Connector, 7-Ceramic shaft sleeve, 8-PTFE oil seal, 9-PTFE washer, 10-Bearing housing. Detailed Implementation

[0016] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0017] Example 1: A ceramic bushing sealing and protection structure for a shaft, such as... Figure 1 As shown, the assembly includes a high-speed shaft 5, a bearing housing 10, and a lower bearing cover 3. The lower bearing cover 3 is installed at the lower end of the bearing housing 10. The high-speed shaft 5 passes through the bearing housing 10 and the lower bearing cover 3. A bearing 1 is installed between the bearing housing 10 and the high-speed shaft 5. An annular baffle 31 is provided on the upper surface of the lower bearing cover 3 to form an oil seal mounting groove. A PTFE oil seal 8 is placed and installed in the oil seal mounting groove for bearing protection. A ceramic bushing 7 is installed between the oil seal lip of the PTFE oil seal 8 and the high-speed shaft 5, and the ceramic bushing 7 contacts and seals with the PTFE oil seal 8. A bushing positioning ring 4 is installed on the high-speed shaft 5 below the ceramic bushing 7 via a connector 6. The bushing positioning ring 4 is composed of an annular sleeve 42 and a plug block 41 connected to the upper end of the annular sleeve. The annular sleeve 42 is fixed to the high-speed shaft 5 via the connector 6. A slot is provided at the lower end of the ceramic bushing 7, and the plug block 41 of the bushing positioning ring is located in the slot of the ceramic bearing. The insertion block 41 of the bushing positioning ring drives the ceramic bushing 7 and the high-speed shaft 5 to rotate synchronously, thus solving the problem of relative movement between the ceramic bushing 7 and the high-speed shaft 5 caused by the friction of the PTFE oil seal.

[0018] In this embodiment, the high-speed shaft 5 is provided with a shoulder, and a PTFE washer 9 is provided between the shoulder and the ceramic bushing 7. An O-ring 2 is provided between the bearing housing 10 and the lower bearing cover 3. The connecting member 6 is a set screw. As an alternative, other connecting members that meet the usage requirements can also be used to install the bushing positioning ring 4.

[0019] Application examples of this utility model Figure 2 As shown, a high-speed disperser equipped with the on-shaft ceramic bushing sealing and protection structure of this utility model is described. During operation, in the on-shaft ceramic bushing sealing and protection structure of this utility model, the PTFE oil seal 8 remains stationary, while the bushing positioning ring 4, the ceramic bearing 7, and the high-speed shaft 5 rotate synchronously.

[0020] This invention has a wide range of applications. In addition to high-speed dispersers, it is also applicable to equipment such as planetary mixers that have high requirements for bearing sealing and protection.

Claims

1. A ceramic bushing sealing and protection structure for a shaft, comprising a high-speed shaft (5), a bearing housing (10), and a lower bearing cover (3), wherein the lower bearing cover is installed at the lower end of the bearing housing, the high-speed shaft passes through the bearing housing and the lower bearing cover, and a bearing (1) is installed between the bearing housing and the high-speed shaft, characterized in that: The upper end face of the lower bearing cover is provided with an annular baffle (31) to form an oil seal mounting groove. A PTFE oil seal (8) is installed in the oil seal mounting groove. A ceramic bushing (7) is installed between the oil seal lip of the PTFE oil seal and the high-speed shaft. A bushing positioning ring (4) is installed on the high-speed shaft below the ceramic bushing through a connector (6). The bushing positioning ring includes an annular sleeve (42) and a plug block (41) connected to the upper end of the annular sleeve. A slot is provided at the lower end of the ceramic bushing, and the plug block of the bushing positioning ring is located in the slot of the ceramic bearing.

2. The shaft-mounted ceramic bushing sealing and protection structure according to claim 1, characterized in that: The high-speed shaft is provided with a shoulder, and a PTFE washer (9) is provided between the shoulder and the ceramic bushing.

3. A shaft-mounted ceramic bushing sealing and protection structure according to claim 1 or 2, characterized in that: An O-ring (2) is provided between the bearing housing and the lower bearing cover.

4. A shaft-mounted ceramic bushing sealing and protection structure according to claim 1 or 2, characterized in that: The connector (6) is a set screw.

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