Protection device of thrust bearing oil injection lubrication system

Abstract

The invention relates to the technical field of sliding bearings, in particular to a protection device of a thrust bearing oil injection lubrication system, which comprises a thrust oil groove, a driving assembly and a telescopic oil bag, a thrust bearing and an oil injection lubrication system thereof are both arranged in the thrust oil groove, and an oil port of the telescopic oil bag is communicated with the interior of the thrust oil groove. Lubricating oil is stored in the telescopic oil bag, and the driving assembly exerts acting force on the telescopic oil bag and changes the volume of the telescopic oil bag. In a compression state, a thrust pad of the thrust bearing is in a wetting and lubricating state; in a non-compression state, a thrust pad of the thrust bearing is in an oil injection lubrication state; the design that the telescopic oil bag is communicated with the thrust oil groove is adopted, the volume change of the telescopic oil bag is controlled through the driving assembly, and automatic switching of lubricating modes can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of sliding bearings, and particularly relates to a protection device for a thrust bearing oil injection lubrication system. Background Art

[0002] The thrust bearing oil injection lubrication system is a highly efficient lubrication method, which plays an important role in reducing bearing wear, eliminating oil churning loss, saving lubricating oil consumption, and improving the operating efficiency of the unit.

[0003] Due to the characteristics of the oil injection lubrication form, in order to eliminate the oil churning loss, the liquid level of the lubricating oil in the thrust oil sump is below the thrust bearing pad. If the power supply of the lubrication system is cut off, the lubricating oil stops spraying. After the unit stops urgently due to inertia and continues to rotate, at this time, the bearing pad is in a dry friction state, resulting in the situation of bearing pad burning.

[0004] Currently, for the power-off protection measures of oil injection lubrication, a high-level oil tank protection is mostly adopted. However, the high-level oil tank usually needs to be installed on the upper part of the equipment, with a certain installation height. But there is no installation height condition at the site of the hydro-generator set, and the installation, commissioning, and maintenance of the high-level oil tank and its related pipelines all require a high technical level and cost. More importantly, the high-level oil tank method has the defects of slow oil replenishment reaction time, insufficient oil supply pressure, and slow oil replenishment speed after the power-off of the lubrication system.

[0005] In summary, the power-off protection measures for thrust bearing oil injection lubrication are important measures to avoid dry friction of the bearing pad after the power-off of the lubrication system and ensure the reliable operation of the generator set. Summary of the Invention

[0006] The technical problem to be solved by the present invention is that the existing thrust bearing oil injection lubrication system cannot restore lubrication in time in case of power-off, resulting in dry friction or damage of the bearing pad. The purpose is to provide a protection device for a thrust bearing oil injection lubrication system, which realizes that when the lubrication system is powered off, it can automatically switch to the infiltration lubrication state, avoid dry friction of the bearing pad, and ensure the stable operation of the unit in an emergency.

[0007] The present invention is realized by the following technical solutions:

[0008] A protection device for a thrust bearing oil injection lubrication system, comprising: a thrust oil sump, a driving component, and a telescopic oil bladder. The thrust bearing and its oil injection lubrication system are both arranged inside the thrust oil sump. The oil port of the telescopic oil bladder is communicated with the inside of the thrust oil sump. The telescopic oil bladder stores lubricating oil inside, and the driving component applies a force to the telescopic oil bladder and changes the volume of the telescopic oil bladder;

[0009] When in a compressed state, the thrust bearing pad is in an infiltration lubrication state;

[0010] When in the non-compression state, the thrust pad of the thrust bearing is in the oil injection lubrication state.

[0011] Furthermore, the protection device also includes a telescopic oil box, which is fixedly connected to the outer side surface of the thrust oil groove, and the telescopic oil bag is arranged in the telescopic oil box.

[0012] Specifically, the driving assembly includes a linear transmission mechanism and an oil bag push plate, the oil bag push plate is fixedly connected to the telescopic oil bag, and the linear transmission mechanism drives the oil bag push plate to move and change the volume of the telescopic oil bag.

[0013] Optionally, the linear transmission mechanism includes: a motor, a lead screw and a lead screw slider, the torque output end of the motor is transmission-connected to the lead screw and drives the lead screw to rotate, and the lead screw slider is movably connected to the lead screw and fixedly connected to the oil bag push plate.

[0014] Optionally, the number of the lead screws is not less than 2, the plurality of lead screws are arranged in parallel, and the lead screw slider is arranged perpendicular to the plurality of lead screws, and the lead screw is perpendicular to the oil port of the telescopic oil bag.

[0015] Specifically, the motor is electrically connected to a UPS backup power supply through a backup power supply cable. When the main power supply of the oil injection lubrication system is cut off, the UPS backup power supply drives the main line transmission mechanism to compress the telescopic oil bag.

[0016] Furthermore, the protection device also includes a wave-breaking baffle, which is arranged on the communication path between the oil port of the telescopic oil bag and the inside of the thrust oil groove.

[0017] Optionally, a plurality of flow-guiding units are provided on the oil-facing surface of the wave-breaking baffle, and the flow-guiding units are convex structures arranged at intervals along the flow direction of the lubricating oil, and flow-guiding channels are formed between adjacent convexities.

[0018] Optionally, the wave-breaking baffle is fixed to the inner side surface of the thrust oil groove through a baffle bracket.

[0019] Optionally, the guide unit is a transversely arranged arc-shaped protrusion; the baffle bracket is fixedly connected to the thrust oil groove by fixing bolts.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0021] By adopting the design of connecting the telescopic oil bag with the thrust oil groove and controlling the volume change of the telescopic oil bag through the driving component, the present invention can realize the automatic switching of lubrication forms. When the lubrication system operates normally, the oil bag is in an uncompressed state, and the thrust bearing is in the oil injection lubrication state; after the lubrication system is powered off, the driving component quickly drives the telescopic oil bag to compress through the backup power supply, so that the lubricating oil flows back to the thrust oil groove, thus forming an immersion lubrication state.

[0022] Through the active compression / stretching control of the telescopic oil bag by the driving component of the present invention, the lubricating oil can complete the rise and fall of the oil groove liquid level within 3 - 5 seconds, so as to seamlessly switch between oil injection lubrication and oil immersion lubrication, significantly shortening the lubrication protection startup time compared with the traditional high-position oil tank scheme and avoiding the risk of dry friction of the bearing bush. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, are used to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention, and the drawings are included in this specification and form a part of this specification, and do not constitute a limitation on the embodiments of the present invention.

[0024] Figure 1 It is a schematic structural diagram of a protection device for a thrust bearing oil injection lubrication system according to the present invention.

[0025] Figure 2 It is a schematic structural diagram of a wave baffle according to the present invention.

[0026] Reference numerals: 1 - thrust bearing and its oil injection lubrication system; 2 - thrust oil groove; 3 - wave baffle; 4 - motor; 5, lead screw slider; 6 - lead screw; 7 - telescopic oil bag; 8 - oil bag push plate; 9 - backup power supply cable; 10 - UPS backup power supply; 11 - diversion unit; 12 - baffle support; 13, fixing bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to make the purpose, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the relevant content and do not limit the present invention.

[0028] In addition, it should be noted that for the convenience of description, only the parts related to the present invention are shown in the drawings.

[0029] In this application, unless otherwise clearly defined or limited, terms such as "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] In this application, unless otherwise clearly defined or limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features between them. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0031] Without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0032] Embodiment 1

[0033] As Figure 1 shown, this embodiment provides a protection device for a thrust bearing oil injection lubrication system. The core lies in controlling the volume change of the telescopic oil bladder 7 through a driving component to achieve a rapid switching of the lubrication form. The protection device includes: a thrust oil sump 2, a driving component, and a telescopic oil bladder 7. The thrust bearing and its oil injection lubrication system 1 are both arranged inside the thrust oil sump 2. The oil port of the telescopic oil bladder 7 is in communication with the inside of the thrust oil sump 2. Lubricating oil is stored inside the telescopic oil bladder 7. The driving component applies a force to the telescopic oil bladder 7 and changes the volume of the telescopic oil bladder 7;

[0034] When the system is in a normal state and the oil bladder is in a non-compressed state, the thrust pads of the thrust bearing are in the oil injection lubrication state, that is, the driving component drives the telescopic oil bladder 7 to stretch, so that its internal volume increases, and part of the lubricating oil in the thrust oil sump 2 is sucked into the telescopic oil bladder 7 for storage; at this time, the lubricating oil level in the thrust oil sump 2 drops to 2 - 5 mm below the working surface of the thrust pads, and the oil injection system continuously sprays lubricating oil onto the thrust pads to form a stable oil film, avoiding oil stirring loss.

[0035] When a failure occurs in the lubrication system (such as a power outage), when the driving component drives the oil bladder to be in a compressed state, the thrust pads of the thrust bearing are in a flooded lubrication state, that is, the driving component immediately acts in the reverse direction, compressing the telescopic oil bladder 7 to reduce its internal volume. The lubricating oil stored in the telescopic oil bladder 7 is pressed back into the thrust oil sump 2 within 3 - 5 seconds, and the liquid level quickly rises to submerge the surface of the thrust pads, forming flooded lubrication to prevent dry friction of the bearing bush.

[0036] The thrust oil sump 2 is the installation location of the thrust bearing and its oil injection lubrication system 1. All the lubricating oil is stored in this oil sump to ensure the lubrication of the thrust bearing. The telescopic oil bladder 7 can be arranged in an independent cavity outside the thrust oil sump 2. The cavity is connected to the thrust oil sump 2 through an oil pipe to ensure that the lubricating oil only flows between the telescopic oil bladder 7 and the thrust oil sump 2, avoiding leakage. The telescopic stroke of the telescopic oil bladder 7 is designed according to the volume requirement of the thrust oil sump 2 to ensure that the liquid level can cover the surface of the thrust pads when compressed and drops to the safe lower limit when stretched.

[0037] Embodiment 2

[0038] The protection device further includes a telescopic oil box, which is fixedly connected to the outer side surface of the thrust oil sump 2, and the telescopic oil bladder 7 is arranged inside the telescopic oil box. The telescopic oil box is a cuboid metal cavity, which is fixed to the outer side wall of the thrust oil sump 2 by welding or bolts to protect the telescopic oil bladder 7.

[0039] The driving component includes a linear transmission mechanism and an oil bladder push plate 8. The oil bladder push plate 8 is fixedly connected to the telescopic oil bladder 7, and the linear transmission mechanism drives the oil bladder push plate 8 to move and change the volume of the telescopic oil bladder 7. The oil port of the telescopic oil bladder 7 is hermetically connected to the corresponding interface on the side wall of the thrust oil sump 2 through a flange to ensure the two-way flow of the lubricating oil between the telescopic oil bladder 7 and the thrust oil sump 2. The other end of the oil bladder is rigidly fixed to the oil bladder push plate 8, enabling the oil bladder push plate 8 to move inside the telescopic oil box, thereby changing the volume of the telescopic oil bladder 7 and further realizing the injection or return of the lubricating oil.

[0040] The linear transmission mechanism includes: a motor 4, a lead screw 6, and a lead screw slider 5. The torque output end of the motor 4 is drivingly connected to the lead screw 6 to drive the lead screw 6 to rotate. The lead screw slider 5 is movably connected to the lead screw 6 and fixedly connected to the oil bladder push plate 8.

[0041] The number of lead screws 6 is not less than 2. A plurality of lead screws 6 are arranged in parallel, and the lead screw slider 5 is arranged perpendicular to the plurality of lead screws 6. The lead screw 6 is perpendicular to the oil port of the telescopic oil bladder 7.

[0042] Two lead screws 6 are symmetrically arranged on both sides of the telescopic oil box, and the axial direction of the lead screw 6 is the same as the telescopic direction of the telescopic oil bladder 7 (i.e., perpendicular to the oil port direction). The lead screw slider 5 is a rectangular plate structure, with its two ends respectively fixed to the nuts of the two lead screws 6, and the middle part is vertically connected to the oil bladder push plate 8. The motor 4 is connected to the end of the lead screw 6 through a coupling. The double motors 4 synchronously drive the lead screw 6 to rotate, ensuring the balanced force when the lead screw slider 5 moves and avoiding the skew and jamming of the oil bladder.

[0043] The motor 4 is electrically connected to the UPS backup power supply 10 through a backup power supply cable 9. When the main power supply of the oil injection lubrication system is cut off, the UPS backup power supply 10 drives the main line transmission mechanism to compress the telescopic oil bladder 7. The UPS backup power supply 10 can be built-in with a voltage detection module. When it detects that the main power supply of the oil injection lubrication system is cut off, it switches to the power supply of the UPS backup power supply 10 within 1 second. The motor 4 receives the driving signal, drives the lead screw 6 to rotate, and drives the lead screw slider 5 and the oil bladder push plate 8 to move inward to the oil bladder, forcibly compressing the telescopic oil bladder 7. The compression action is completed within 3 - 5 seconds, enabling the lubricating oil to quickly flow back to the thrust oil groove 2 and cover the surface of the thrust bearing.

[0044] Ensure the stable and reliable operation of the 4 generator sets. Until the fault of the oil pump is eliminated during the unit maintenance, start the oil injection lubrication system, and make the motor 4 drive the lead screw 6 to rotate, stretching the telescopic oil bladder 7, so that the lubricating oil in the thrust oil groove 2 flows back to the telescopic oil bladder 7 for storage. At this time, the lubricating oil level is again below the thrust bearing.

[0045] Embodiment 3

[0046] In this embodiment, aiming at the impact surge problem that may occur when the lubricating oil quickly flows back from the telescopic oil bladder 7 to the thrust oil groove 2, the uniform distribution of the oil fluid is achieved through the collaborative design of the wave baffle 3 and the diversion unit 11.

[0047] As Figure 2 shown, the wave baffle 3 is arranged on the communication path between the oil port of the telescopic oil bladder 7 and the inside of the thrust oil groove 2. The wave baffle 3 is fixed to the inner side surface of the thrust oil groove 2 through the baffle support 12. The baffle support 12 is fixedly connected to the thrust oil groove 2 through the fixing bolt 13.

[0048] The wave baffle 3 is a rectangular flat plate structure, arranged on the communication path between the oil port of the telescopic oil bladder 7 and the inside of the thrust oil groove 2, and is located at a position on the inner side wall of the oil groove close to the oil port. The wave baffle 3 is fixed through the L-shaped baffle support 12. The short side of the baffle support 12 is provided with a strip-shaped bolt hole and is connected to the inner wall of the thrust oil groove 2 through the fixing bolt 13. The strip-shaped hole design allows the adjustment of the distance between the wave baffle 3 and the oil port (usually 5 - 15 cm) to adapt to different flow rate requirements.

[0049] A plurality of flow guiding units 11 are provided on the oil-facing surface of the wave baffle 3. The flow guiding units 11 are convex structures arranged at intervals along the lubricating oil flow direction, and flow guiding channels are formed between adjacent protrusions. The flow guiding units 11 are arc-shaped protrusions arranged horizontally.

[0050] On the oil-facing surface (the side facing the telescopic oil bladder 7) of the wave baffle 3, there are a plurality of horizontally arranged arc-shaped protrusions. Each protrusion is distributed in a wavy pattern along the lubricating oil flow direction. The distance between adjacent protrusions is 10 - 30 mm, forming a flow guiding channel. The cross-section of the arc-shaped protrusion is semi-circular, with a height of 5 - 10 mm, and its radian direction is the same as the oil flow direction, which is used to break up the concentrated oil flow into multiple thin streams.

[0051] When the lubricating oil flows back from the telescopic oil bladder 7 to the thrust oil groove 2 at a high speed, the oil flow first impacts the arc-shaped protrusions of the wave baffle 3. The protrusions divide the concentrated oil flow into multi-directional branches flowing along the flow guiding channels. At the same time, the arc-shaped surface guides the oil flow to spread to both sides, avoiding directly hitting the bottom of the thrust oil groove 2.

[0052] In the description of this specification, the description with reference to terms such as "an embodiment / way", "some embodiments / ways", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with that embodiment / way or example are included in at least one embodiment / way or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment / way or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments / ways or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments / ways or examples described in this specification and the features of different embodiments / ways or examples.

[0053] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0054] Those skilled in the art should understand that the above embodiments are only for clearly explaining the present invention and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or variations can be made on the basis of the above invention, and these changes or variations are still within the scope of the present invention.

Claims

1. A protection device for an oil injection lubrication system of a thrust bearing, characterized in that, Including: A thrust oil sump (2), a drive assembly, and a telescopic oil bladder (7). The thrust bearing and its oil injection lubrication system (1) are both arranged inside the thrust oil sump (2). The oil port of the telescopic oil bladder (7) is communicated with the inside of the thrust oil sump (2). Lubricating oil is stored inside the telescopic oil bladder (7). The drive assembly applies a force to the telescopic oil bladder (7) and changes the volume of the telescopic oil bladder (7). When in the compressed state, the thrust pads of the thrust bearing are in the state of immersion lubrication. When in the non-compressed state, the thrust pads of the thrust bearing are in the state of oil injection lubrication.

2. The protection device of a thrust bearing oil injection lubrication system according to claim 1, characterized in that, It further includes a telescopic oil box which is fixedly connected to the outer side surface of the thrust oil sump (2), and the telescopic oil bladder (7) is arranged inside the telescopic oil box.

3. The protection device of a thrust bearing oil injection lubrication system according to claim 2, characterized in that, The drive assembly includes a linear transmission mechanism and an oil bladder push plate (8). The oil bladder push plate (8) is fixedly connected to the telescopic oil bladder (7), and the linear transmission mechanism drives the oil bladder push plate (8) to move and changes the volume of the telescopic oil bladder (7).

4. The protection device of a thrust bearing oil injection lubrication system according to claim 3, characterized in that The linear transmission mechanism includes: a motor (4), a lead screw (6), and a lead screw slider (5). The torque output end of the motor (4) is in transmission connection with the lead screw (6) and drives the lead screw (6) to rotate. The lead screw slider (5) is movably connected to the lead screw (6) and is fixedly connected to the oil bladder push plate (8).

5. The protection device of a thrust bearing oil injection lubrication system according to claim 4, characterized in that, The number of the lead screws (6) is not less than 2. A plurality of the lead screws (6) are arranged in parallel, and the lead screw slider (5) is arranged perpendicular to the plurality of lead screws (6). The lead screw (6) is perpendicular to the oil port of the telescopic oil bladder (7).

6. The protection device of a thrust bearing oil injection lubrication system according to claim 4, characterized in that, The motor (4) is electrically connected to the UPS backup power supply (10) through a backup power supply cable (9). When the main power supply of the oil injection lubrication system is cut off, the UPS backup power supply (10) drives the main line transmission mechanism to compress the telescopic oil bladder (7).

7. The protection device of an oil injection lubrication system for a thrust bearing according to claim 1, characterized in that, The protection device further includes a wave baffle (3), and the wave baffle (3) is arranged on the communication path between the oil port of the telescopic oil bladder (7) and the inside of the thrust oil sump (2).

8. The protection device of a thrust bearing oil injection lubrication system according to claim 7, characterized in that, A plurality of flow guiding units (11) are arranged on the oil-facing surface of the wave baffle (3). The flow guiding units (11) are convex structures arranged at intervals along the flowing direction of the lubricating oil, and flow guiding channels are formed between adjacent protrusions.

9. The protection device of a thrust bearing oil injection lubrication system according to claim 8, characterized in that, The wave baffle (3) is fixed to the inner side surface of the thrust oil sump (2) through a baffle support (12).

10. The protection device of a thrust bearing oil injection lubrication system according to claim 8, characterized in that, The flow guiding unit (11) is an arc-shaped protrusion arranged horizontally; the baffle support (12) is fixedly connected to the thrust oil sump (2) through a fixing bolt (13).

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