High load thrust bearing for high speed submersible permanent magnet motor

Abstract

The application discloses a high-load thrust bearing for a high-rotating-speed submersible permanent magnet motor and belongs to the field of thrust bearings. The high-load thrust bearing comprises a bearing base, a strain gauge arranged on the bearing base, and a silicon carbide thrust piece arranged on the strain gauge. A carbon powder layer and a rubber layer are arranged on the silicon carbide thrust piece. The silicon carbide thrust piece in the high-load thrust bearing has high wear resistance and avoids deformation under high pressure. The strain gauge can monitor pressure during operation. When overheating occurs during high-speed rotation, the molten rubber layer and the carbon powder are mixed to form a lubricating medium, and the silicon carbide thrust piece contains carbon ceramic powder, thus having self-lubricating property. When the carbon powder-molten rubber lubricating medium fails, the silicon carbide thrust piece and the shaft sleeve are in dry friction, thus delaying overheating sintering.

Description

Technical Field

[0001] This invention relates to the field of thrust bearings, and in particular to a high-load-bearing thrust bearing for high-speed submersible permanent magnet motors. Background Technology

[0002] In the bearing industry, the thrust plates of conventional thrust bearings are generally made of engineering PEEK or Babbitt alloy. Engineering PEEK has a pressure resistance of 10 MPa, while Babbitt alloy has a pressure resistance of 12~15 MPa. These can meet the requirements under low speed and low load conditions. However, under high speed and high load (pressure per unit area exceeding 20 MPa), the excessive pressure will cause the thrust plate to deform. The thrust plate will squeeze the oil film, leading to oil film lubrication failure and bearing overheating and sintering. Summary of the Invention

[0003] In order to solve the problem in the prior art that excessive pressure per unit area leads to deformation of the thrust plate and failure of the oil film under high speed and high load conditions, the present invention provides a high load-bearing thrust bearing for high speed submersible permanent magnet motors.

[0004] The present invention is achieved by the following technical solution.

[0005] A high-load-bearing thrust bearing for a high-speed submersible permanent magnet motor includes a bearing base, on which strain gauges are provided, and on which silicon carbide thrust plates are provided; the silicon carbide thrust plates are provided with a carbon powder layer and a rubber layer.

[0006] Furthermore, the strain gauge is embedded within the bearing base disk.

[0007] Furthermore, the bearing base is connected to the silicon carbide thrust plate by fixing bolts.

[0008] Furthermore, the silicon carbide thrust plate consists of several sector-shaped parts and connecting parts between two adjacent sector-shaped parts. Fixing bolts are installed on the connecting parts to connect the silicon thrust plate to the bearing base.

[0009] Furthermore, a central groove is formed on the upper surface of the silicon carbide thrust plate, and the carbon powder layer and the rubber layer are embedded in the central groove, with the rubber layer surrounding the carbon powder layer.

[0010] Furthermore, the silicon carbide thrust plate has a lubricating medium guide groove around its central groove.

[0011] This application has the following beneficial effects: (1) Silicon carbide thrust plates improve wear resistance and avoid deformation under high pressure: Silicon carbide thrust plates are installed on the bearing base plate by fixing bolts. The physical properties of silicon carbide, wear resistance and compressive strength are better than engineering PEEK plastic and Babbitt alloy, thus avoiding excessive deformation under high-speed friction.

[0012] (2) Strain gauge monitoring of operating pressure: By placing strain gauges on the bearing base plate, pressure signals are provided when the bearing is under pressure. Subsequently, combined with sensors and testing systems, the bearing pressure during operation can be monitored.

[0013] (3) New lubrication method avoids evaporation of lubricating medium: Conventional lubrication methods are oil lubrication or water lubrication, which are prone to evaporation under high temperature and high pressure, leading to overheating and burning of bearings. The thrust plate has a lubricating medium guide groove, and the thrust plate is equipped with a carbon powder layer and a rubber layer. When the high-speed rotation is overheated, the rubber layer melts and mixes with the carbon powder to form a lubricating medium.

[0014] (4) Self-lubricating silicon carbide bearing auxiliary lubrication: The characteristic of silicon carbide thrust plates is that carbon ceramic powder is mixed in the production process. Through the carbon ceramic powder, the silicon carbide thrust plates have self-lubricating properties. When the carbon powder-molten rubber lubricating medium fails, the silicon carbide thrust plates are delayed overheated and sintered under dry friction conditions with the coaxial sleeve. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention.

[0016] The components include: 1. silicon carbide thrust plate; 2. lubricating medium guide groove; 3. carbon powder layer; 4. rubber layer; 5. strain gauge; 6. fixing bolt; and 7. bearing base plate. Detailed Implementation

[0017] The present patent application will be further described below with reference to the embodiments. Unless otherwise specified, the materials used in the preparation process in the following embodiments have not undergone further processing and have been commercially available.

[0018] like Figure 1 As shown, a high-load-bearing thrust bearing for a high-speed submersible permanent magnet motor includes a silicon carbide thrust plate 1, a lubricating medium guide groove 2, a carbon powder layer 3, a rubber layer 4, a strain gauge 5, a fixing bolt 6, and a bearing base plate 7.

[0019] The bearing base 7 is equipped with a strain gauge 5, which is embedded in the bearing base 7. The strain gauge 5 is provided with a silicon carbide thrust plate 1, which is composed of several sector-shaped parts and connecting parts between two adjacent sector-shaped parts. The connecting parts are connected to the bearing base 7 by fixing bolts 6. When the silicon carbide thrust plate 1 is subjected to pressure, it can move downward along the fixing bolts 6, thereby squeezing the strain gauge 5. The strain gauge 5 provides a pressure signal after being compressed. A central groove is provided in the center of the upper surface of the silicon carbide thrust plate 1. A carbon powder layer 3 is embedded in the central groove. The carbon powder layer 3 is wrapped with a rubber layer 4. A lubricating medium guide groove 2 is also provided around the central groove.

[0020] The silicon carbide thrust plate 1 of this invention is made of SiC material containing graphite C powder. Because the silicon carbide thrust plate 1 is made of the above-mentioned material, it possesses self-lubricating properties. The strain gauge 5 of this invention is a KFG general-purpose foil strain gauge, with the measuring range selected according to the working conditions. The carbon powder layer 3 is made of graphite carbon powder material, and the rubber layer 4 is made of perfluoroether rubber.

[0021] The working principle and application characteristics of the silicon carbide high-speed thrust bearing with a carbon powder or rubber lubricating substrate of the present invention are as follows: (1) Silicon carbide thrust plate 1 improves wear resistance and avoids deformation under high pressure: The bearing base plate 7 is fitted with silicon carbide thrust plate 1 by fixing bolts 6. The physical properties of silicon carbide, wear resistance and compressive strength are better than engineering PEEK plastic and Babbitt alloy, thus avoiding excessive deformation under high-speed friction.

[0022] (2) Strain gauge 5 monitors the pressure during operation: Strain gauge 5 is installed on the bearing base plate 7 to provide a pressure signal when under pressure. Subsequently, combined with sensors and testing systems, the bearing pressure during operation can be monitored.

[0023] (3) New lubrication method avoids evaporation of lubricating medium: Conventional lubrication methods are oil lubrication or water lubrication, which are prone to evaporation under high temperature and high pressure, resulting in overheating and burning of bearings. The thrust plate has a lubricating medium guide groove 2, and a carbon powder layer 3 and a rubber layer 4 are placed on the thrust plate. When the high speed rotation is overheated, the rubber layer 4 is molten and mixed with the carbon powder to form a lubricating medium.

[0024] (4) Self-lubricating silicon carbide bearing auxiliary lubrication: The silicon carbide thrust plate 1 is characterized by the inclusion of carbon ceramic powder in the production process. The silicon carbide thrust plate 1 has self-lubricating properties through the carbon ceramic powder. When the carbon powder-molten rubber lubricating medium fails, the silicon carbide thrust plate 1 will be delayed and overheated under dry friction conditions with the coaxial sleeve.

[0025] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A high-load-bearing thrust bearing for a high-speed submersible permanent magnet motor, comprising a bearing base (7), characterized in that: A strain gauge (5) is provided on the bearing base plate (7), and a silicon carbide thrust plate (1) is provided on the strain gauge (5); the silicon carbide thrust plate (1) is provided with a carbon powder layer (3) and a rubber layer (4).

2. The high-load-bearing thrust bearing for a high-speed submersible permanent magnet motor according to claim 1, characterized in that: The strain gauge (5) is embedded in the bearing base plate (7).

3. A high-load-bearing thrust bearing for a high-speed submersible permanent magnet motor according to claim 1, characterized in that: The bearing base plate (7) is connected to the silicon carbide thrust plate (1) by fixing bolts (6).

4. A high-load-bearing thrust bearing for a high-speed submersible permanent magnet motor according to claim 3, characterized in that: The silicon carbide thrust plate (1) consists of several sector-shaped parts and a connecting part between two adjacent sector-shaped parts. A fixing bolt (6) is installed on the connecting part to connect the silicon thrust plate (1) to the bearing base plate (7).

5. A high-load-bearing thrust bearing for a high-speed submersible permanent magnet motor according to claim 1, characterized in that: The silicon carbide thrust plate (1) has a central groove on its upper surface. The carbon powder layer (3) and the rubber layer (4) are embedded in the central groove, and the rubber layer (4) wraps around the carbon powder layer (3).

6. A high-load-bearing thrust bearing for a high-speed submersible permanent magnet motor according to claim 5, characterized in that: The silicon carbide thrust plate (1) has a lubricating medium guide groove (2) around the central groove.

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