A cable outlet device for preventing oil leakage from a steam turbine bearing housing

Abstract

A cable outlet device for preventing oil leakage in turbine bearing housings belongs to the field of turbine technology. The device includes a bearing housing body, a lead wire connector seat, an outlet sleeve, and a lead wire connector. The lead wire connector seat is threaded to the bearing housing body and equipped with a copper gasket. The outlet sleeve is threaded to the lead wire connector seat and has a downward-facing lead wire window on only one side. The lead wire connector is threaded to the lead wire connector seat and equipped with an oil-resistant gasket. The other end is connected to a cable protection corrugated pipe. This invention reduces the risk of oil leakage through multi-layer sealing with copper and oil-resistant gaskets and a downward-facing lead wire window, utilizing the synergistic effect of gravity and sealing materials. Multiple cables can be led out simultaneously, reducing the amount of machining required for the bearing housing. The modular design facilitates disassembly and assembly, and the centralized cable outlet improves aesthetics. It is suitable for cable outlet scenarios in various turbine bearing housings.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine technology, specifically to a steam turbine bearing housing oil leakage prevention outlet device. Background Technology

[0002] Turbine bearings are core supporting components of steam turbines, and real-time monitoring of their operating status (such as temperature and vibration) is crucial to ensuring the safe and stable operation of the steam turbine. To achieve this monitoring, the cables of the sensors at the bearing need to be led out from the bearing housing to the monitoring system. Therefore, reliable cable routing and oil leakage prevention of the bearing housing are the core requirements of this process.

[0003] The existing cable exit method for steam turbine bearing housings has the following drawbacks:

[0004] 1) Using aviation plugs for cable exit: Aviation plugs need to be installed by drilling holes in the bearing housing, which is complex and aesthetically unappealing. The connection between the plug and the bearing housing is prone to oil leakage due to poor sealing.

[0005] 2) Using multiple cable connectors for cable output: It is necessary to process about 20 threaded holes on the bearing housing, which is a complex process with a large workload; and each cable connector can only lead out one cable, resulting in the cables being scattered, inconvenient to organize, and aesthetically unappealing. At the same time, there is a risk of oil leakage at the sealing parts of multiple connectors.

[0006] Therefore, there is an urgent need for a turbine bearing housing cable outlet device that can centrally lead out multiple cables, has a simple structure, reliable sealing, and requires minimal machining, in order to overcome the shortcomings of existing technologies. Utility Model Content

[0007] To address the problems of complex structure, large machining workload, high risk of oil leakage, and poor aesthetics in existing turbine bearing housing cable outlet methods, this utility model provides a cable outlet device for preventing oil leakage from turbine bearing housing. The aim is to enable multiple cables to be led out simultaneously, reduce the machining workload of the bearing housing, improve sealing performance to reduce the risk of oil leakage, and simplify the structure to improve the convenience of disassembly and assembly and the aesthetics.

[0008] The technical solution adopted by this utility model to solve its technical problem is as follows:

[0009] A cable outlet device for preventing oil leakage in a turbine bearing housing includes a bearing housing body, a lead wire connector seat, an outlet sleeve, and a lead wire connector. The lead wire connector seat is located on the outside of the bearing housing body and is connected to the bearing housing body by threads, with a copper gasket between them. The outlet sleeve is located on the inside of the bearing housing body and is connected to the lead wire connector seat by threads, with a lead wire window on only one side of the outlet sleeve, which faces downwards during assembly. One end of the lead wire connector is connected to the lead wire connector seat by threads, with an oil-resistant gasket between them, and the other end of the lead wire connector is used to connect a cable protection corrugated pipe.

[0010] The bearing housing has a boss at the wire exit position, and the boss has a threaded hole that mates with the lead wire connector seat to ensure the thread insertion depth of the lead wire connector seat.

[0011] The connection between the lead connector and the cable protective corrugated tube is either threaded or snap-fit.

[0012] The lead window size of the outgoing sleeve is adapted to accommodate multiple sensor cables passing through simultaneously.

[0013] A sealing ring is provided at the cable outlet of the lead connector.

[0014] Due to the adoption of the above technical solution, this utility model has the following advantages:

[0015] 1) Excellent leakage prevention effect: Through multi-layer sealing of copper gaskets and oil-resistant gaskets, combined with the downward-facing lead wire sleeve structure, the risk of leakage of lubricating oil and oil fumes is significantly reduced by the synergistic effect of gravity and sealing materials.

[0016] 2) Multiple cables can be led out at the same time: A single cable lead-out device can lead out multiple sensor cables at the same time. Only 2 to 3 such cable lead-out devices need to be set on the bearing housing to meet the requirements, which greatly reduces the amount of processing required for the bearing housing.

[0017] 3) Simple structure and easy to disassemble and assemble: The components are connected by threads, and the modular design makes the disassembly and assembly process simple and easy to maintain later; the centralized cable outlet also improves the aesthetics of the overall layout.

[0018] 4) Strong protection: The lead wire connector is connected to the cable protective corrugated tube, which can avoid the wire being exposed and prevent the wire from being damaged by friction, oil stains, etc., thus ensuring the safety of the sensor cable. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 These are cross-sectional and bottom views of the cable outlet sleeve in this utility model.

[0021] In the diagram: 1-bearing housing, 101-lead connector, 102-oil resistant gasket, 103-lead connector seat, 104-copper gasket, 105-outlet sleeve, 2-sensor cable, 201-lead window. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] The accompanying drawings show a turbine bearing housing oil leakage prevention device, which includes a bearing housing body 1, a lead wire connector seat 103, a lead wire sleeve 105, and a lead wire connector 101.

[0024] The lead wire connector 103 is located on the outside of the bearing housing 1 and is connected to the bearing housing 1 by threads, with a copper washer 104 between them. A boss is provided at the wire outlet position of the bearing housing 1, and the boss has a threaded hole that mates with the lead wire connector 103 to ensure the thread insertion depth of the lead wire connector 103. Before assembly, ensure that the surface of the boss area of ​​the bearing housing 1 is flat, free of burrs and oil, and that the preset threaded hole accuracy meets design requirements, such as thread tolerance and perpendicularity, to ensure the connection stability of the lead wire connector 103.

[0025] The cable outlet sleeve 105 is located inside the bearing housing 1 and is connected to the lead wire connector seat 103 via threads. The cable outlet sleeve 105 has a lead wire window 201 on only one side, which faces downwards during assembly. The size of the lead wire window 201 of the cable outlet sleeve 105 is adapted to accommodate multiple sensor cables 2 passing through simultaneously. The downward-facing lead wire window 201 of the cable outlet sleeve 105, in conjunction with the vertically arranged lead wire channel, uses gravity to prevent lubricating oil from leaking along the cable, forming an "active + passive" leak-proof synergy with the sealing gasket.

[0026] One end of the lead connector 101 is connected to the lead connector seat 103 via a thread, with an oil-resistant gasket 102 between them. A copper gasket 104 and the oil-resistant gasket 102 form a seal at different connection levels. Combined with the tightness of the threaded connection, this achieves dual protection through a combination of mechanical connection and material sealing. The other end of the lead connector 101 is used to connect to a cable protection corrugated tube. The connection between the lead connector 101 and the cable protection corrugated tube is either a threaded connection or a snap-fit ​​connection. A sealing ring is provided at the cable outlet of the lead connector 101.

[0027] The assembly process of this utility model is as follows:

[0028] 1. Fixing the lead connector seat: Place the copper gasket 104 on the boss surface of the bearing housing 1, and then screw the lead connector seat 103 into the threaded hole of the bearing housing 1 until the lead connector seat 103 and the copper gasket 104 are tightly fitted together; the copper gasket 104 undergoes plastic deformation due to pressure, filling the gap of the connection surface and forming a preliminary seal.

[0029] 2. Install the lead sleeve: Inside the bearing housing 1, connect the lead sleeve 105 to the lead connector seat 103 via threads, and adjust its screw-in depth to ensure that the lead window 201 of the lead sleeve 105 faces directly downwards; this posture can use gravity to prevent splashed lubricating oil from entering the lead channel, reducing the risk of leakage.

[0030] 3. Connecting the lead wire connector: Place the oil-resistant gasket 102 on the outer connecting end of the lead wire connector seat 103, and then connect the lead wire connector 101 to the lead wire connector seat 103 by thread, so that the oil-resistant gasket 102 fits tightly; the oil-resistant gasket 102 and the copper gasket 104 form a double seal to isolate the oil fumes in the bearing chamber.

[0031] 4. Lead out the sensor cables: Pass multiple sensor cables 2 through the lead window 201 of the lead sleeve 105, and lead them out through the internal channel of the lead connector seat 103 and the lead connector 101; according to the sealing requirements, a sealing ring can be added at the outlet of the sensor cable 2 and the lead connector 101 to further improve the sealing performance.

[0032] 5. Connect the protective components: Connect the other end of the lead connector 101 to the cable protection corrugated tube to ensure that the sensor cable 2 is not exposed, and complete the assembly.

[0033] The parts not detailed above are existing technologies and therefore have not been described in detail.

Claims

1. A device for preventing oil leakage from a turbine bearing housing, characterized in that: The assembly includes a bearing housing (1), a lead wire connector seat (103), a lead wire sleeve (105), and a lead wire connector (101). The lead wire connector seat (103) is located on the outside of the bearing housing (1) and is connected to the bearing housing (1) by a thread, with a copper gasket (104) between them. The lead wire sleeve (105) is located on the inside of the bearing housing (1) and is connected to the lead wire connector seat (103) by a thread, with a lead wire window (201) on only one side of the lead wire sleeve (105), which faces downward during assembly. One end of the lead wire connector (101) is connected to the lead wire connector seat (103) by a thread, with an oil-resistant gasket (102) between them, and the other end of the lead wire connector (101) is used to connect to a cable protection corrugated pipe.

2. The outlet device for preventing oil leakage from a turbine bearing housing according to claim 1, characterized in that: The bearing housing (1) has a boss at the wire outlet position. The boss has a threaded hole that mates with the lead wire connector (103) to ensure the thread insertion depth of the lead wire connector (103).

3. The outlet device for preventing oil leakage from a turbine bearing housing according to claim 1, characterized in that: The connection between the lead connector (101) and the cable protection corrugated pipe is either a threaded connection or a snap-fit ​​connection.

4. The outlet device for preventing oil leakage from a turbine bearing housing according to claim 1, characterized in that: The lead window (201) of the outgoing sleeve (105) is sized to accommodate multiple sensor cables (2) that can be inserted simultaneously.

5. The outlet device for preventing oil leakage from a turbine bearing housing according to claim 1, characterized in that: The cable outlet of the lead connector (101) is provided with a sealing ring.

Images