Two-oil-return-port oil shield with automatic oil discharge device
By installing an automatic oil drain device with two oil return ports in the turbine bearing housing, and utilizing three anti-leakage barriers and a pressure-reducing exhaust channel, the problem of lubricating oil leakage was solved, achieving zero lubricating oil leakage and efficient bearing lubrication, thus extending the bearing's service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHIWEI POWER WUXI CO LTD
- Filing Date
- 2025-05-27
- Publication Date
- 2026-05-15
AI Technical Summary
Existing turbine bearing housing lubricating oil is prone to leakage, leading to safety hazards. Furthermore, traditional sealing technology accelerates the aging of seals under high pressure, affecting bearing life and oil quality.
The system employs a dual-return oil baffle with an automatic oil drain device, along with three anti-leakage barriers and a pressure-reducing exhaust channel to prevent lubricating oil leakage, maintain pressure balance within the bearing housing, and reduce air ingress.
This achieved zero lubricant leakage, improved bearing lubrication and service life, reduced the impact of external air on bearings, and ensured the safety and stability of power production.
Smart Images
Figure CN224244944U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lubricating oil sealing technology for turbine bearing housings, specifically to a two-stage oil return port baffle equipped with an automatic oil draining device. Background Technology
[0002] In thermal power plants, to prevent lubricating oil leakage from the turbine bearing housing and maintain the tightness of both moving and stationary parts, fixed toothed oil baffle seals are generally used. The oil baffle consists of two sets of inner and outer oil sealing teeth and an oil return groove. Each set of oil baffle teeth has 2-4 copper or aluminum strips embedded in the oil baffle body. Its function is to prevent lubricating oil leakage from the bearing housing and the entry of external steam. The oil baffle is installed at both ends of the bearing housing using mounting grooves or screws. This sealing technology is widely used in in-service turbine units. When the turbine rotates at high speed, splashed lubricating oil can seep out between the rotor and the oil baffle. Lubricating oil falling onto high-temperature pipes and cylinders can easily cause smoke, fire, and damage to nearby protective cables, leading to unsafe situations. Therefore, the oil baffle is a key area for daily maintenance in thermal power plants and requires special attention to prevent potential equipment hazards, prevent accidents from escalating, and ensure the safety and stability of power production. Therefore, a dual-return oil baffle with an automatic oil draining device is needed to prevent oil leakage. Utility Model Content
[0003] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a two-stage oil return port oil baffle with an automatic oil draining device, which prevents oil leakage through three anti-leakage barriers.
[0004] The objective of this utility model is achieved through the following technical solution:
[0005] A two-stage return oil baffle equipped with an automatic oil draining device, characterized in that it includes an oil baffle body and an automatic oil draining device;
[0006] The oil baffle body has an outer ring and an inner ring, the inner ring through which the rotor shaft passes; the two ends of the oil baffle body form a steam end and an oil end respectively; the inner ring of the oil baffle body is provided with a plurality of sealing teeth; the inner ring of the oil baffle body is provided with an oil return groove, an oil discharge groove and an air supply groove; the oil return groove, the oil discharge groove and the air supply groove are arranged sequentially from the steam end to the oil end;
[0007] The automatic oil draining device is located at the oil end of the oil baffle body. The automatic oil draining device is connected to the oil return groove and the oil draining groove. The automatic oil draining device is used to collect and guide back the lubricating oil separated from the oil return groove and the oil draining groove.
[0008] In one optional embodiment, the oil return groove is located near the oil end of the oil baffle body, and the oil return groove has a bottom wall and a side wall; a first oil return channel is provided in the oil baffle body, one end of the first oil return channel is connected to the side wall of the oil return groove, and the other end extends to the oil end; the oil return groove is connected to the automatic oil discharge device through the first oil return channel; the first oil return channel is located below in the direction of gravity.
[0009] In one optional embodiment, the oil drain trough is disposed between the oil return trough and the air supply trough, and the oil drain trough has a bottom wall and a side wall; a second oil return channel is disposed in the oil baffle body, one end of the second oil return channel is connected to the bottom wall of the oil drain trough, and the other end extends to the oil end; the oil drain trough is connected to the automatic oil draining device through the second oil return channel; the second oil return channel is disposed below in the direction of gravity.
[0010] In one optional embodiment, the air supply groove is located near the steam end of the oil baffle body, and the air supply groove has a bottom wall and a side wall; an air supply channel is provided in the oil baffle body, one end of the air supply channel is connected to the side wall of the air supply groove, and the other end extends to the steam end; the air supply channel is connected to the air supply device through an air supply pipe.
[0011] In one optional embodiment, the oil baffle body is provided with a pressure-reducing exhaust channel, one end of which is connected to the side wall of the oil drain groove, and the other end extends to the steam end.
[0012] In one optional embodiment, a pressure-reducing exhaust cap is further included, which is disposed at the steam end of the oil baffle body and is connected to the pressure-reducing exhaust channel.
[0013] In one optional embodiment, both the pressure-reducing exhaust cap and the pressure-reducing exhaust channel are positioned above the direction of gravity.
[0014] In one optional embodiment, a pressure equalizing ring is provided in the air supply groove, which divides the air supply groove into an air supply chamber and an air outlet chamber; the pressure equalizing ring has a plurality of air passage holes arranged in a circumferential ring array.
[0015] In one optional embodiment, one end of the sealing tooth is fixed to the inner ring of the oil baffle body, and the other end has a tooth tip; the sealing tooth is arranged radially along the inner ring of the oil baffle body.
[0016] In one optional embodiment, the outer ring of the oil baffle body is provided with a connecting flange, which is used to fix the oil baffle body to the bearing housing.
[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0018] 1. The present invention provides a two-stage oil return port oil baffle with an automatic oil draining device. It has three anti-leakage barriers on the oil baffle body, namely the first oil return groove, the second oil drain groove, and the third air supply groove. When the rotor shaft rotates, lubricating oil leaks outward through the gap between the oil baffle body and the rotor shaft. When the lubricating oil passes through the return oil groove, most of it enters the automatic oil discharge device through the return oil hole. A small portion, or the lubricating oil that cannot pass through the return groove in time, overflows into the discharge oil groove and enters the automatic oil discharge device through the pipe between the discharge oil groove and the automatic oil discharge device. When the turbine starts, the large circumferential vibration of the rotor shaft causes the gap between the oil baffle body and the rotor shaft to be unevenly distributed in the circumferential direction. Some lubricating oil will pass through the return oil groove and the discharge oil groove, which to some extent aggravates the lubricating oil leakage. Therefore, by connecting the external compressed air supply pipe to the air supply groove, the air supply groove is kept at a high pressure by supplying air to the air supply groove. This makes it difficult for the lubricating oil to leak outward through the air supply groove under high pressure, and it flows back into the discharge oil groove under air pressure. Through these three anti-leakage barriers, zero leakage of bearing box lubricating oil is achieved.
[0019] 2. This utility model features a dual-return oil baffle with an automatic oil draining device. By connecting the oil drain groove to the pressure-reducing exhaust cap at the steam end of the oil baffle body via a pressure-reducing exhaust channel, air entering from the air supply groove is discharged through the aforementioned pressure-reducing exhaust cap within the oil drain groove. An automatic oil draining device, installed at the oil end of the oil baffle body, is connected to the lower side of the oil drain groove. This device only drains oil, not air, preventing the sealed gas entering the return oil groove from entering the bearing housing and affecting the oil quality and pressure within the bearing housing. Instead, the gas is discharged from the upper pressure-reducing vent cap. By installing an automatic oil draining device on the oil baffle body, air is prevented from entering the bearing housing. The automatic oil draining device, in conjunction with the upper pressure-reducing vent cap, balances the pressure within the bearing housing, thereby reducing disruption to the distribution of the lubricating oil film inside the bearing. This allows the lubricating oil to evenly cover the rolling elements and raceways of the bearing, balancing friction, improving lubrication, reducing wear, and extending bearing life. It also reduces the possibility of external air entering the bearing housing, improving oil quality. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the structure of the double-return oil baffle with an automatic oil draining device in Example 1;
[0021] Figure 2 This is a schematic diagram of the pressure reduction and exhaust channel of the two return oil port baffle equipped with an automatic oil draining device in Example 1;
[0022] Figure 3 This is a schematic diagram of the first and second oil return channels of the double oil return port baffle equipped with an automatic oil draining device in Example 1.
[0023] Figure 4 This is a schematic diagram of the air supply channel of the two-stage oil return port baffle equipped with an automatic oil draining device in Example 1.
[0024] Figure 5 This is a schematic diagram of the structure of the oil-vapor barrier end of the two-way oil return port equipped with an automatic oil draining device in Example 1;
[0025] Figure 6 This is a schematic diagram of the structure of the oil baffle end of the two-way oil return port equipped with an automatic oil draining device in Example 1.
[0026] In the diagram: 10. Oil baffle body; 11. Steam end; 12. Oil end; 13. Oil return groove; 131. First oil return channel; 14. Oil drain groove; 141. Second oil return channel; 142. Pressure reduction and exhaust channel; 15. Air supply groove; 151. Air supply channel; 152. Air supply pipe; 16. Pressure equalizing ring; 161. Air supply chamber; 162. Air outlet chamber; 163. Air passage hole; 20. Sealing tooth; 30. Automatic oil drain device; 40. Pressure reduction and exhaust cap; 50. Connecting flange; 90. Rotor shaft. Detailed Implementation
[0027] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Unless otherwise specified, the materials and equipment used in this embodiment are all commercially available. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0028] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.
[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0030] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or apparatus.
[0031] Example 1:
[0032] Please refer to Figure 1-6 This embodiment provides a two-way oil return port oil baffle equipped with an automatic oil draining device, including an oil baffle body 10 and an automatic oil draining device 30 installed on the oil baffle body 10;
[0033] The oil baffle body 10 has a ring-shaped structure with an outer ring and an inner ring, through which the rotor shaft 90 can pass; the two ends of the oil baffle body 10 form a steam end 11 and an oil end 12 respectively; the inner ring of the oil baffle body 10 is provided with a plurality of sealing teeth 20; the inner ring of the oil baffle body 10 is provided with an oil return groove 13, an oil discharge groove 14 and an air supply groove 15; the oil return groove 13, the oil discharge groove 14 and the air supply groove 15 are arranged sequentially from the steam end 11 to the oil end 12;
[0034] The automatic oil draining device 30 is disposed at the oil end 12 of the oil baffle body 10. The automatic oil draining device 30 is connected to the return oil groove 13 and the draining oil groove 14. The automatic oil draining device 30 is used to collect and guide back the lubricating oil separated from the return oil groove 13 and the draining oil groove 14.
[0035] Specifically, the oil return groove 13 is located near the oil end 12 of the oil baffle body 10, and the oil return groove 13 has a bottom wall and a side wall; a first oil return channel 131 is provided inside the oil baffle body 10, one end of the first oil return channel 131 is connected to the side wall of the oil return groove 13, and the other end extends to the oil end 12; the oil return groove 13 is connected to the automatic oil draining device 30 through the first oil return channel 131; the first oil return channel 131 is located below the direction of gravity.
[0036] The oil drain trough 14 is disposed between the oil return trough 13 and the air supply trough 15, and the oil drain trough 14 has a bottom wall and a side wall; a second oil return channel 141 is disposed inside the oil baffle body 10, one end of the second oil return channel 141 is connected to the bottom wall of the oil drain trough 14, and the other end extends to the oil end 12; the oil drain trough 14 is connected to the automatic oil draining device 30 through the second oil return channel 141; the second oil return channel 141 is disposed below the direction of gravity.
[0037] The air supply groove 15 is located near the steam end 11 of the oil baffle body 10. The air supply groove 15 has a bottom wall and side walls. An air supply channel 151 is provided inside the oil baffle body 10. One end of the air supply channel 151 is connected to the side wall of the air supply groove 15, and the other end extends to the steam end 11. The air supply channel 151 is connected to the air supply device through an air supply pipe 152. Further, a pressure equalizing ring 16 is provided inside the air supply groove 15, which divides the air supply groove 15 into an air supply chamber 161 and an air outlet chamber 162. The pressure equalizing ring 16 has a plurality of air passage holes 163 arranged in a circumferential array. The air supply device provides compressed air, which is delivered to the air supply chamber 161 through the air supply pipe 152 and the air supply channel 151, and enters the air outlet chamber 162 through the air passage holes 163 arranged in a ring to supply air between the sealing teeth 20, so that the air supply groove 15 maintains a large and stable pressure.
[0038] This embodiment features a double-return oil baffle with an automatic oil draining device. Three leak-proof barriers are installed on the oil baffle body 10: a first return oil groove 13, a second drain oil groove 14, and a third air supply groove 15. When the rotor shaft 90 rotates, lubricating oil leaks outward through the gap between the oil baffle body 10 and the rotor shaft 90. When the lubricating oil passes through the return oil groove 13, most of it enters the automatic oil draining device 30 through the return oil hole. A small portion, or lubricating oil that doesn't have time to pass through the return groove, overflows into the drain oil groove 14 and enters the automatic oil draining device 30 through the pipe between the drain oil groove 14 and the automatic oil draining device 30. When the turbine starts, the large circumferential vibration of the rotor shaft 90 causes the oil baffle body 10 to become loose and leak into the rotor shaft 90. The gaps between the 0s are unevenly distributed in the circumferential direction, and some lubricating oil will pass over the return oil groove 13 and the drain oil groove 14, which to some extent aggravates the lubricating oil leakage. Therefore, by connecting the external compressed air supply pipe 152 to the air supply groove 15, the air supply groove 15 is kept at a large pressure by supplying air to the air supply groove 15, so that the above-mentioned lubricating oil is difficult to pass over the air supply groove 15 and leak outward under high pressure, and then flows back to the drain oil groove 14 under air pressure. Through these three anti-leakage barriers, zero leakage of bearing box lubricating oil is achieved.
[0039] Furthermore, the oil baffle body 10 is provided with a pressure-reducing exhaust channel 142, one end of which is connected to the side wall of the oil drain trough 14, and the other end extends to the steam end 11.
[0040] It also includes a pressure-reducing exhaust cap 40, which is disposed at the steam end 11 of the oil baffle body 10 and is connected to the pressure-reducing exhaust channel 142. The pressure-reducing exhaust cap 40 is used to control the connection and disconnection between the pressure-reducing exhaust channel 142 and the outside world. Both the pressure-reducing exhaust cap 40 and the pressure-reducing exhaust channel 142 are disposed above the direction of gravity.
[0041] In this embodiment, the oil baffle with an automatic oil draining device has two return oil ports. The oil drain trough 14 is connected to the pressure-reducing exhaust cap 40 at the steam end 11 of the oil baffle body 10 via a pressure-reducing exhaust channel 142. This ensures that air entering from the air supply trough 15 is discharged through the pressure-reducing exhaust cap 40 within the oil drain trough 14. An automatic oil draining device 30, installed at the oil end 12 of the oil baffle body 10, is connected to the lower side of the oil drain trough 14. This device only drains oil and does not vent air, preventing the sealing gas entering the return oil trough 13 from entering the bearing housing and affecting the oil quality and pressure within the bearing housing. Instead, the gas is discharged from the upper pressure-reducing vent cap.
[0042] One end of the sealing tooth 20 is fixed to the inner ring of the oil baffle body 10, and the other end has a tooth tip; the sealing tooth 20 is arranged radially along the inner ring of the oil baffle body 10.
[0043] The oil baffle body 10 is provided with a connecting flange 50 on its outer ring, which is used to fix the oil baffle body 10 to the bearing housing.
[0044] This embodiment employs a three-layer leak-proof barrier structure. After the lubricating oil passes through the first return oil groove 13 and enters the drain oil groove 14, some air is blown out from the gap between the teeth on both sides of the air supply groove 15, causing some air to enter the drain oil groove 14. This prevents the lubricating oil inside the chamber from leaking out and instead flows back to the automatic drain oil device 30 for draining. Excess air pressure in the groove is discharged through the pressure-reducing vent cap, reducing the pressure impact of compressed air on the chamber.
[0045] Compared to traditional pneumatic sealing methods, while traditional pneumatic seals may not leak oil at the oil baffle, the excessively high pressure inside the bearing housing exerts additional pressure on other seals such as sealing rings and gaskets. Prolonged exposure to this high pressure accelerates the aging and deformation of these seals, reducing their sealing performance, shortening their replacement cycle, and increasing maintenance costs.
[0046] Based on this, this embodiment incorporates an automatic oil draining device 30 on the oil baffle body 10, making it difficult for air to enter the bearing housing. The automatic oil draining device 30, in conjunction with the pressure-reducing vent cap on the upper side, balances the pressure within the bearing housing, thereby reducing disruption to the distribution of the lubricating oil film inside the bearing. This allows the lubricating oil to evenly cover the rolling elements and raceways of the bearing, balancing friction, improving lubrication, reducing wear, and extending the bearing's service life. It also reduces the possibility of external air entering the bearing housing, improving oil quality.
[0047] Although certain components and embodiments of this application have been illustrated and described, many modifications and alterations (e.g., variations in the size, dimensions, structure, shape and proportion of the various elements, installation arrangement, material use, color, orientation, etc.) will be conceived by those skilled in the art without actually departing from the scope and spirit of the claims.
[0048] Finally, it should be noted that the above embodiments are only preferred embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.
Claims
1. A dual-return oil baffle equipped with an automatic oil draining device, characterized in that, Includes the oil baffle body and the automatic oil draining device; The oil baffle body has an outer ring and an inner ring, the inner ring through which the rotor shaft passes; the two ends of the oil baffle body form a steam end and an oil end respectively; the inner ring of the oil baffle body is provided with a plurality of sealing teeth; the inner ring of the oil baffle body is provided with an oil return groove, an oil discharge groove and an air supply groove; the oil return groove, the oil discharge groove and the air supply groove are arranged sequentially from the steam end to the oil end; The automatic oil draining device is located at the oil end of the oil baffle body. The automatic oil draining device is connected to the oil return groove and the oil draining groove. The automatic oil draining device is used to collect and guide back the lubricating oil separated from the oil return groove and the oil draining groove.
2. The oil baffle with a two-stage oil return port equipped with an automatic oil draining device according to claim 1, characterized in that, The oil return groove is located near the oil end of the oil baffle body, and the oil return groove has a bottom wall and a side wall; a first oil return channel is provided in the oil baffle body, one end of the first oil return channel is connected to the side wall of the oil return groove, and the other end extends to the oil end; the oil drain groove is connected to the automatic oil draining device through the first oil return channel; the first oil return channel is located below the direction of gravity.
3. The oil baffle with a two-stage return oil port equipped with an automatic oil draining device according to claim 1, characterized in that, The oil drain trough is located between the oil return trough and the air supply trough, and the oil drain trough has a bottom wall and side walls; a second oil return channel is provided in the oil baffle body, one end of the second oil return channel is connected to the bottom wall of the oil drain trough, and the other end extends to the oil end; the oil drain trough is connected to the automatic oil draining device through the second oil return channel; the second oil return channel is located below the direction of gravity.
4. The oil baffle with a two-stage oil return port equipped with an automatic oil draining device according to claim 3, characterized in that, The air supply groove is located near the steam end of the oil baffle body, and the air supply groove has a bottom wall and a side wall; the oil baffle body is provided with an air supply channel, one end of which is connected to the side wall of the air supply groove, and the other end extends to the steam end; the air supply channel is connected to the air supply device through an air supply pipe.
5. A dual-return oil baffle with an automatic oil draining device as described in claim 4, characterized in that, The oil baffle body is provided with a pressure reduction and exhaust channel. One end of the pressure reduction and exhaust channel is connected to the side wall of the oil drain groove, and the other end extends to the steam end.
6. A dual-return oil baffle with an automatic oil draining device as described in claim 5, characterized in that, It also includes a pressure-reducing exhaust cap, which is disposed at the steam end of the oil baffle body and is connected to the pressure-reducing exhaust channel.
7. A dual-return oil baffle with an automatic oil draining device as described in claim 6, characterized in that, Both the pressure-reducing exhaust cap and the pressure-reducing exhaust channel are positioned above the direction of gravity.
8. A dual-return oil baffle with an automatic oil draining device according to claim 4, characterized in that, The air supply groove is equipped with a pressure equalizing ring, which divides the air supply groove into an air supply chamber and an air outlet chamber; the pressure equalizing ring has a number of air passage holes arranged in a circumferential ring array.
9. A dual-return oil baffle with an automatic oil draining device according to claim 1, characterized in that, One end of the sealing tooth is fixed to the inner ring of the oil baffle body, and the other end has a tooth tip; the sealing tooth is arranged radially along the inner ring of the oil baffle body.
10. A dual-return oil baffle with an automatic oil draining device according to claim 1, characterized in that, The outer ring of the oil baffle body is provided with a connecting flange, which is used to fix the oil baffle body to the bearing housing.