Bearing lubricating system suitable for multiple working conditions of wind turbine generator and control method

Abstract

The invention discloses a bearing lubricating system suitable for multiple working conditions of a wind turbine generator and a control method, and the bearing lubricating system suitable for the multiple working conditions of the wind turbine generator comprises an oil supply assembly, a reversing valve, a rated lubricating pipeline, an auxiliary lubricating pipeline, a one-way valve, an overflow valve, a pressurizing assembly and a standby lubricating pipeline. The rated lubricating pipeline is connected with the reversing valve, the pressurizing assembly is connected with the reversing valve through the auxiliary lubricating pipeline, the one-way valve is arranged on the auxiliary lubricating pipeline between the pressurizing assembly and the reversing valve, the overflow valve is arranged on the auxiliary lubricating pipeline between the pressurizing assembly and the one-way valve, and the standby lubricating pipeline is connected with the pressurizing assembly. Oil can be supplied to the bearing according to different operation working conditions, the operation and maintenance cost is effectively reduced, and the reliability of bearing lubrication in the non-rotation or low-speed rotation / swing state of the gearbox of the wind turbine generator is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind turbine generator sets, and in particular relates to a bearing lubrication system and a control method suitable for multiple working conditions of wind turbine generator sets. Background Art

[0002] In recent years, wind turbines have made great progress as a renewable clean energy source. With the continuous increase in the capacity of wind turbines, wind turbine gearboxes using large-size rolling bearings have been fully developed. During the transportation, installation and power failure of the unit, the wind turbine gearbox does not rotate or rotates / sways at a low speed, and the bearing rollers are seriously unevenly stressed. At the same time, since the wind turbine gearbox bearings do not receive the necessary lubrication, especially the roller bearings above the oil level, the bearing raceway and the roller surface are in a state of dry friction without lubrication, which makes the bearings prone to early accelerated fatigue damage in subsequent operation, and the problem of greatly reduced service life has gradually become prominent.

[0003] In order to avoid this situation, traditional wind turbines usually use storage power supplies or internal combustion engine power generation as a temporary power source for the lubricating oil pump, which not only increases the complexity of wind turbine operation, but also greatly increases operation and maintenance costs. Summary of the invention

[0004] In order to at least partially solve the technical problems existing in the above-mentioned prior art, the present invention provides a bearing lubrication system and a control method suitable for multiple working conditions of a wind turbine.

[0005] The bearing lubrication system suitable for wind turbines in multiple working conditions of the present invention comprises an oil supply assembly, a reversing valve, a rated lubrication pipeline, an auxiliary lubrication pipeline, a one-way valve, an overflow valve, a pressurizing assembly and a standby lubrication pipeline, wherein the input end of the reversing valve is connected to the oil supply assembly, the rated lubrication pipeline is connected to the reversing valve, and is used to lubricate the bearing when the wind turbine is operating normally, the pressurizing assembly is connected to the reversing valve through the auxiliary lubrication pipeline, and is used to provide lubricating oil to the pressurizing assembly, the one-way valve is arranged on the auxiliary lubrication pipeline between the pressurizing assembly and the reversing valve, the overflow valve is arranged on the auxiliary lubrication pipeline between the pressurizing assembly and the one-way valve, and is used to relieve pressure on the auxiliary lubrication pipeline, the standby lubrication pipeline is connected to the pressurizing assembly, and is used to lubricate the bearing when the wind turbine is shut down, wherein:

[0006] The pressurizing assembly includes a cache cylinder, a boosting counterweight, a boosting piston, a refueling cap and a filter element. The boosting piston is arranged inside the cache cylinder to squeeze the lubricating oil cached in the cache cylinder. The boosting counterweight is arranged on the boosting piston to increase the constant squeezing force of the boosting piston. The refueling cap is arranged at the refueling end of the cache cylinder to replenish the lubricating oil to the cache cylinder. The filter element is arranged at the output end of the cache cylinder to filter and throttle the lubricating oil.

[0007] Furthermore, in the above-mentioned bearing lubrication system suitable for multiple working conditions of wind turbines, the oil supply assembly includes a coupling and a bidirectional cycloid pump, the bidirectional cycloid pump drive end is connected to the output shaft of the wind turbine through the coupling, and the bidirectional cycloid pump oil inlet is connected to the lubricating oil pool of the wind turbine gearbox.

[0008] Furthermore, in the above-mentioned bearing lubrication system suitable for multiple working conditions of wind turbines, the reversing valve adopts a manual two-position three-way reversing valve, the input end of the reversing valve is connected to the oil outlet of the bidirectional cycloid pump, the rated lubrication pipeline is connected to the left side output end of the reversing valve, one end of the auxiliary lubrication pipeline is connected to the right side output end of the reversing valve, and the other end of the auxiliary lubrication pipeline is connected to the input end of the cache cylinder.

[0009] Furthermore, in the above-mentioned bearing lubrication system applicable to multiple working conditions of a wind turbine generator set, the oil inlet side of the overflow valve is connected to the auxiliary lubrication pipeline, and the overflow port of the overflow valve is connected to the rated lubrication pipeline.

[0010] Furthermore, in the above-mentioned bearing lubrication system applicable to multiple working conditions of a wind turbine generator set, the standby lubrication pipeline is connected to the output end of the buffer cylinder through the filter element.

[0011] Furthermore, in the above-mentioned bearing lubrication system applicable to multiple working conditions of a wind turbine generator set, the filter element is woven from metal wires.

[0012] The present invention provides a bearing lubrication system control method applicable to wind turbines under multiple working conditions, comprising:

[0013] When the wind turbine gearbox is not rotating, the reversing valve closes the rated lubrication pipeline to supply oil, and at the same time, opens the auxiliary lubrication pipeline to wait for the oil replenishment of the pressurizing component. The booster weight in the pressurizing component continuously applies pressure on the booster piston, and the booster piston continuously squeezes the lubricating oil in the buffer cylinder. After the lubricating oil penetrates through the filter element, it reaches the bearing oil groove / hole that needs lubrication through the standby lubrication pipeline for lubrication;

[0014] When the wind turbine gearbox is slightly rotating or swinging, the oil supply component is driven to supply oil to the reversing valve, and the reversing valve closes the rated lubrication pipeline to supply oil. At the same time, the auxiliary lubrication pipeline is opened to replenish oil to the pressurizing component. The booster weight in the pressurizing component continuously applies pressure on the booster piston, and the booster piston continuously squeezes the lubricating oil in the buffer cylinder. After the lubricating oil penetrates through the filter element, it reaches the bearing oil groove / hole that needs lubrication through the standby lubrication pipeline for lubrication. In the process of pumping the lubricating oil into the pressurizing component through the auxiliary lubrication pipeline, the booster weight is lifted at the same time. When the buffer cylinder is full or the flow in the auxiliary lubrication pipeline is large, the overflow valve is opened, and the lubricating oil flows into the box through the rated lubrication pipeline;

[0015] When the wind turbine gearbox rotates normally, the oil supply assembly is driven to supply oil to the reversing valve, and the reversing valve closes the oil supply of the auxiliary lubrication pipeline. At the same time, the rated lubrication pipeline is opened, and the lubricating oil reaches the bearing oil groove / hole that needs lubrication through the rated lubrication pipeline for lubrication.

[0016] The bearing lubrication system and control method applicable to multiple working conditions of a wind turbine generator system of the present invention have the following advantages and beneficial effects:

[0017] The oil supply component adopts a bidirectional cycloid pump to connect with the output shaft of the wind turbine, and oil can be pumped in both forward and reverse directions; two lubrication oil circuits, the rated lubrication pipeline and the standby lubrication pipeline, are used, which are compatible with the rated work during normal operation and the lubrication of the bearings in the state of no rotation or low speed rotation / swinging; by adjusting the wire diameter and weaving method of the booster weight and the filter element, the lubrication oil flow is constant and adjustable; the operation and maintenance costs are effectively reduced, and the reliability of bearing lubrication in the state of no rotation or low speed rotation / swinging of the wind turbine gearbox is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings in the following descriptions are only used to further understand the embodiments of the present invention and constitute a part of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0019] Figure 1 The present invention is a schematic structural diagram of a bearing lubrication system suitable for multiple working conditions of a wind turbine generator set.

[0020] Description of reference numerals:

[0021] 1: oil supply assembly, 11: coupling, 12: bidirectional cycloid pump;

[0022] 2: reversing valve; 3: rated lubrication pipeline; 4: auxiliary lubrication pipeline; 5: check valve; 6: overflow valve;

[0023] 7: pressurizing assembly, 71: buffer cylinder, 72: pressurizing counterweight, 73: pressurizing piston, 74: refueling cap, 75: filter element;

[0024] 8: Standby lubrication pipeline. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] like Figure 1 As shown, the bearing lubrication system suitable for wind turbines in multiple working conditions of the present invention comprises an oil supply component 1, a reversing valve 2, a rated lubrication pipeline 3, an auxiliary lubrication pipeline 4, a one-way valve 5, an overflow valve 6, a pressurizing component 7 and a standby lubrication pipeline 8. The input end of the reversing valve 2 is connected to the oil supply component 1, the rated lubrication pipeline 3 is connected to the reversing valve 2, and is used to lubricate the bearing when the wind turbine is operating normally. The pressurizing component 7 is connected to the reversing valve 2 through the auxiliary lubrication pipeline 4, and is used to provide lubricating oil to the pressurizing component 7. The one-way valve 5 is arranged on the auxiliary lubrication pipeline 4 between the pressurizing component 7 and the reversing valve 2, and the overflow valve 6 is arranged on the auxiliary lubrication pipeline 4 between the pressurizing component 7 and the one-way valve 5, and is used to relieve the pressure of the auxiliary lubrication pipeline 4. The standby lubrication pipeline 8 is connected to the pressurizing component 7, and is used to lubricate the bearing when the wind turbine is shut down, wherein:

[0027] The pressurizing assembly 7 includes a buffer cylinder 71, a boosting counterweight 72, a boosting piston 73, a refueling cap 74 and a filter element 75. The boosting piston 73 is arranged inside the buffer cylinder 71, and is used to squeeze the lubricating oil cached in the buffer cylinder 71. The boosting counterweight 72 is arranged on the boosting piston 73, and is used to increase the squeezing force of the boosting piston 73. The refueling cap 74 is arranged at the refueling end of the buffer cylinder 71, and is used to replenish the lubricating oil to the buffer cylinder 71. The filter element 75 is arranged at the output end of the buffer cylinder 71, and is used to filter and throttle the lubricating oil.

[0028] The amount of lubricating oil cached in the cache oil cylinder 71 is injected in advance through the refueling cap according to the estimated standby time. If necessary, the refueling cap 74 on the cache oil cylinder 71 can be opened to replenish the lubricating oil. The lubricating oil in the cache oil cylinder 71 does not depend on all working conditions when lubricating the bearing.

[0029] Furthermore, in the bearing lubrication system suitable for multiple working conditions of a wind turbine of the present invention, the oil supply assembly 1 includes a coupling 11 and a bidirectional cycloidal pump 12. The driving end of the bidirectional cycloidal pump 12 is connected to the output shaft of the wind turbine through the coupling 11, and the oil inlet of the bidirectional cycloidal pump 12 is connected to the lubricating oil pool of the wind turbine gearbox, thereby connecting to the output shaft of the wind turbine through the bidirectional cycloidal pump 12, so that the bidirectional cycloidal pump 12 provides lubricating oil power and meets the lubrication requirements of the wind turbine in normal operation, no rotation or low-speed rotation / swinging.

[0030] Furthermore, in the bearing lubrication system suitable for multiple working conditions of a wind turbine generator set of the present invention, the reversing valve 2 adopts a manual two-position three-way reversing valve, the input end of the reversing valve 2 is connected to the oil outlet of the bidirectional cycloidal pump 12, the rated lubrication pipeline 3 is connected to the left output end of the reversing valve 2, one end of the auxiliary lubrication pipeline 4 is connected to the right output end of the reversing valve 2, and the other end of the auxiliary lubrication pipeline 4 is connected to the input end of the buffer cylinder 71, so that when the wind turbine generator set is operating normally, the reversing valve 2 switches the oil supply to the rated lubrication pipeline 3 to ensure lubrication, and when the wind turbine generator set rotates / swings at a low speed, the reversing valve 2 switches the auxiliary lubrication pipeline 4 to supply oil to the pressurizing component 7.

[0031] Furthermore, in the bearing lubrication system suitable for multiple operating conditions of a wind turbine of the present invention, the oil inlet side of the overflow valve 6 is connected to the auxiliary lubrication pipeline 4, and the overflow port of the overflow valve 6 is connected to the rated lubrication pipeline 3, so that after the pressurizing component 7 is filled with lubricating oil or when the flow rate of the auxiliary lubrication pipeline 4 is large, the pressure is released through the rated lubrication pipeline 3, thereby effectively protecting the auxiliary lubrication pipeline 4.

[0032] Furthermore, in the bearing lubrication system suitable for multiple working conditions of a wind turbine of the present invention, the standby lubrication pipeline 8 is connected to the output end of the buffer cylinder 71 through a filter element, thereby filtering the lubricating oil and ensuring a constant flow of the lubricating oil.

[0033] Furthermore, in the bearing lubrication system suitable for multiple working conditions of wind turbines of the present invention, the filter element 75 is woven with metal wires. The size of the gaps between the metal wires is changed by changing the wire diameter and the weaving method of the metal wires. At the same time, it works together with the boost counterweight 72 to adjust the flow rate of the lubricating oil passing through the filter element 75.

[0034] The present invention provides a bearing lubrication system control method applicable to wind turbines under multiple working conditions, comprising:

[0035] Since the wind turbine is not rotating or is rotating / swinging slightly, the amount of lubricating oil required for the bearing is small;

[0036] When the wind turbine gearbox is not rotating, the reversing valve 2 closes the rated lubrication pipeline 3 to supply oil, and at the same time, opens the auxiliary lubrication pipeline 4 to wait for the wind turbine gearbox to rotate or swing slightly, and replenishes oil to the pressurizing component 7. The booster weight 72 in the pressurizing component 7 continuously applies pressure to the booster piston 73, and the booster piston 73 continuously squeezes the lubricating oil cached in the cache cylinder 71. After the lubricating oil penetrates through the filter element 75, the lubricating oil reaches the bearing oil groove / hole that needs lubrication through the standby lubrication pipeline 8 for lubrication;

[0037] When the wind turbine gearbox is slightly rotating or swinging, the oil supply component 1 is driven to supply oil to the reversing valve 2. The output shaft of the wind turbine drives the bidirectional cycloid pump 12 to work through the coupling 11. The bidirectional cycloid pump 12 takes oil from the oil inlet and supplies oil to the reversing valve 2 through the oil outlet. The reversing valve 2 closes the rated lubrication pipeline 3 to supply oil. At the same time, the auxiliary lubrication pipeline 4 is opened to replenish oil to the pressurizing component 7. The booster counterweight 72 in the pressurizing component 7 continuously applies pressure on the booster piston 73. The booster piston 73 continuously squeezes the lubricating oil in the buffer cylinder 71. After the lubricating oil penetrates through the filter element 75, it reaches the bearing oil groove / hole that needs lubrication through the standby lubrication pipeline 8. In the process of the auxiliary lubrication pipeline 4 pumping the lubricating oil into the pressurizing component 7, the booster counterweight 72 is lifted at the same time. When the buffer cylinder 71 is full or the flow in the auxiliary lubrication pipeline 4 is large, the overflow valve 6 is opened, and the lubricating oil flows into the box through the rated lubrication pipeline 3.

[0038] When the wind turbine gearbox is in normal rotation state, the wind turbine output shaft drives the bidirectional cycloid pump 12 to work through the coupling 11, the bidirectional cycloid pump 12 takes oil from the oil inlet, supplies oil to the reversing valve 2 through the oil outlet, drives the oil supply component 1 to supply oil to the reversing valve 2, the reversing valve 2 closes the auxiliary lubrication pipeline 4 to supply oil, and at the same time, opens the rated lubrication pipeline 3, and the lubricating oil reaches the bearing oil groove / hole that needs lubrication through the rated lubrication pipeline 3 for lubrication.

[0039] In summary, compared with the prior art, the bearing lubrication system and control method applicable to wind turbines under multiple working conditions of the present invention have the following advantages and beneficial effects:

[0040] The oil supply component adopts a bidirectional cycloid pump to connect with the output shaft of the wind turbine, and oil can be pumped in both forward and reverse directions; two lubrication oil circuits, the rated lubrication pipeline and the standby lubrication pipeline, are used, which are compatible with the rated work during normal operation and the lubrication of the bearings in the state of no rotation or low speed rotation / swinging; by adjusting the wire diameter and weaving method of the booster weight and the filter element, the lubrication oil flow is constant and adjustable; the operation and maintenance costs are effectively reduced, and the reliability of bearing lubrication in the state of no rotation or low speed rotation / swinging of the wind turbine gearbox is improved.

[0041] It should be noted that, in this article, unless otherwise clearly specified and limited, the term "connection" or its synonyms should be understood in a broad sense. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. Moreover, expressions such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. At the same time, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. In addition, "front", "back", "left", "right", "upper" and "lower" in this article are all referenced to the placement state shown in the accompanying drawings.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bearing lubrication system suitable for multiple working conditions of a wind turbine, characterized in that: The bearing lubrication system suitable for multiple working conditions of a wind turbine generator set comprises an oil supply assembly, a reversing valve, a rated lubrication pipeline, an auxiliary lubrication pipeline, a one-way valve, a relief valve, a pressurizing assembly and a standby lubrication pipeline. The input end of the reversing valve is connected to the oil supply assembly, the rated lubrication pipeline is connected to the reversing valve, and is used to lubricate the bearing when the wind turbine generator set is operating normally. The pressurizing assembly is connected to the reversing valve through the auxiliary lubrication pipeline, and is used to provide lubricating oil to the pressurizing assembly. The one-way valve is arranged on the auxiliary lubrication pipeline between the pressurizing assembly and the reversing valve. The relief valve is arranged on the auxiliary lubrication pipeline between the pressurizing assembly and the one-way valve, and is used to relieve pressure on the auxiliary lubrication pipeline. The standby lubrication pipeline is connected to the pressurizing assembly, and is used to lubricate the bearing when the wind turbine generator set is shut down, wherein: The pressurizing assembly includes a cache cylinder, a boosting counterweight, a boosting piston, a refueling cap and a filter element. The boosting piston is arranged inside the cache cylinder to squeeze the lubricating oil cached in the cache cylinder. The boosting counterweight is arranged on the boosting piston to increase the squeezing force of the boosting piston. The refueling cap is arranged at the refueling end of the cache cylinder to replenish the lubricating oil to the cache cylinder. The filter element is arranged at the output end of the cache cylinder to filter and throttle the lubricating oil.

2. The bearing lubrication system applicable to multiple working conditions of a wind turbine according to claim 1 is characterized in that: The oil supply assembly includes a coupling and a bidirectional cycloid pump. The driving end of the bidirectional cycloid pump is connected to the output shaft of the wind turbine generator set through the coupling, and the oil inlet of the bidirectional cycloid pump is connected to the lubricating oil pool of the wind turbine gearbox.

3. The bearing lubrication system applicable to multiple working conditions of a wind turbine according to claim 2 is characterized in that: The reversing valve adopts a manual two-position three-way reversing valve, the input end of the reversing valve is connected to the oil outlet of the bidirectional cycloid pump, the rated lubrication pipeline is connected to the left side output end of the reversing valve, one end of the auxiliary lubrication pipeline is connected to the right side output end of the reversing valve, and the other end of the auxiliary lubrication pipeline is connected to the input end of the cache cylinder.

4. The bearing lubrication system applicable to multiple working conditions of a wind turbine according to claim 1, characterized in that: The oil inlet side of the overflow valve is connected to the auxiliary lubrication pipeline, and the overflow port of the overflow valve is connected to the rated lubrication pipeline.

5. The bearing lubrication system applicable to multiple working conditions of a wind turbine according to claim 1 is characterized in that: The standby lubrication pipeline is connected to the output end of the buffer cylinder through the filter element.

6. The bearing lubrication system applicable to multiple working conditions of a wind turbine according to claim 1, characterized in that: The filter element is woven from metal wires.

7. A bearing lubrication system control method suitable for wind turbines under multiple working conditions, characterized in that: include: When the wind turbine gearbox is not rotating, the reversing valve closes the rated lubrication pipeline to supply oil, and at the same time, opens the auxiliary lubrication pipeline to wait for the oil replenishment of the pressurizing component. The booster weight in the pressurizing component continuously applies pressure on the booster piston, and the booster piston continuously squeezes the lubricating oil in the buffer cylinder. After the lubricating oil penetrates through the filter element, it reaches the bearing oil groove / hole that needs lubrication through the standby lubrication pipeline for lubrication; When the wind turbine gearbox is slightly rotating or swinging, the oil supply component is driven to supply oil to the reversing valve, and the reversing valve closes the rated lubrication pipeline to supply oil. At the same time, the auxiliary lubrication pipeline is opened to replenish oil to the pressurizing component. The booster weight in the pressurizing component continuously applies pressure on the booster piston, and the booster piston continuously squeezes the lubricating oil in the buffer cylinder. After the lubricating oil penetrates through the filter element, it reaches the bearing oil groove / hole that needs lubrication through the standby lubrication pipeline for lubrication. In the process of pumping the lubricating oil into the pressurizing component through the auxiliary lubrication pipeline, the booster weight is lifted at the same time. When the buffer cylinder is full or the flow in the auxiliary lubrication pipeline is large, the overflow valve is opened, and the lubricating oil flows into the box through the rated lubrication pipeline; When the wind turbine gearbox rotates normally, the oil supply assembly is driven to supply oil to the reversing valve, and the reversing valve closes the oil supply of the auxiliary lubrication pipeline. At the same time, the rated lubrication pipeline is opened, and the lubricating oil reaches the bearing oil groove / hole that needs lubrication through the rated lubrication pipeline for lubrication.

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