Retainer and bearing for high-pressure casting wind power generation

Abstract

The invention discloses a retainer and a bearing for high-pressure casting wind power generation, and belongs to the technical field of retainers. The retainer is defined by at least two retainer units, and each retainer unit comprises a first arc section, a second arc section and a third arc section, the second arc section and the first arc section are concentrically arranged, and a preset distance is formed between the second arc section and the first arc section; one end of each window beam is connected with the corresponding first arc section, the other end of each window beam is connected with the corresponding second arc section, the multiple window beams are arranged at intervals, the distances between any two adjacent window beams are the same, and pocket holes are formed; the first arc section, the second arc section and the window beam are integrally formed through high-pressure casting. The technical problem that an existing holder for wind power generation is poor in durability is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of retainers, and in particular to a retainer and a bearing for high-pressure casting of wind power generation. Background Art

[0002] Wind is one of the non-polluting energy sources. Moreover, it is inexhaustible. For coastal islands, grassland pastoral areas, mountainous areas and plateau areas that are short of water, fuel and have inconvenient transportation, it is very suitable to use wind power to generate electricity in accordance with local conditions, and there is great potential for it.

[0003] In a wind turbine, the bearing supports the rotation of the wind rotor and transmits torque, so that the generator generates electricity. Compared with other bearings, wind turbine bearings need to bear a very large load and need to be able to operate stably under conditions such as low speed, repeated starting, and variable loads. Therefore, higher durability requirements are placed on wind turbine bearings. To this end, a cage with higher durability is proposed. Summary of the invention

[0004] The main purpose of the present invention is to provide a high-pressure cast wind power generation retainer and a bearing, aiming to improve the durability of the current wind power generation retainer.

[0005] To achieve the above-mentioned purpose, the high-pressure casting wind power generation retainer proposed in the present invention is enclosed by at least two retainer units, each retainer unit comprising: The first arc segment; a second arc segment, which is arranged concentrically with the first arc segment and is spaced a predetermined distance from the first arc segment; A window beam, one end of which is connected to the first arc segment, and the other end of which is connected to the second arc segment, a plurality of window beams are arranged at intervals, and two adjacent window beams form a pocket; The first arc segment, the second arc segment and the window beam are integrally formed by high-pressure casting.

[0006] Optionally, in one embodiment of the present invention, the first arc segment, the second arc segment and the window beam are made of cast aluminum high pressure casting.

[0007] Optionally, in one embodiment of the present invention, the window beam comprises: a crossbeam, one end of which is connected to the first arc segment, and the other end of which is connected to the second arc segment; A rib plate is connected to the cross beam and is located on at least one side of the cross beam.

[0008] Optionally, in one embodiment of the present invention, one rib is respectively provided on the crossbeam on both sides of the pocket, the two ribs are located on both sides of the first arc segment, and the two ribs are bent towards each other, and the two ribs are staggered along the direction from the first arc segment to the second arc segment.

[0009] Optionally, in one embodiment of the present invention, the rib plate of the same pocket close to the first arc segment is the first rib plate, the other rib plate is the second rib plate, and also includes a third rib plate, wherein the third rib plate and the second rib plate are located on the same side of the first arc segment, and along the direction from the first arc segment to the second arc segment, the third rib plate and the second rib plate are arranged at the same height, and the third rib plate and the second rib plate are bent opposite to each other.

[0010] Optionally, in one embodiment of the present invention, the pocket accommodates a tapered roller, and the roller is gradually tightened from the lower section to the upper section, the first rib wraps the upper section, and the second rib and the third rib wrap the lower section.

[0011] Optionally, in an embodiment of the present invention, the rib plate has a first end surface and a second end surface, and the rib plate is gradually tightened along a direction from the second end surface to the first end surface, and the cross beam connects the second end surface of the rib plate.

[0012] Optionally, in one embodiment of the present invention, along the direction of the cross beam, both sides of the rib plate have empty sections.

[0013] Optionally, in one embodiment of the present invention, the surface of the first arc segment, the second arc segment and the window beam are coated with a plastic film.

[0014] Optionally, in an embodiment of the present invention, the pocket accommodates a rolling body, and the rolling body is a cylindrical rolling body.

[0015] The present invention further provides a bearing, comprising: an inner ring, an outer ring and the high pressure casting wind power generation retaining frame as described above.

[0016] Compared with the prior art, the present invention can at least achieve the following beneficial effects. Whether it is repeated start-stop, variable load, or low-speed operation, it will affect the durability of wind power bearings. To this end, a retainer made by a high-pressure casting process is proposed, which is formed by enclosing at least two sections of retainer units. During the high-pressure casting process, liquid metal is quickly injected into the mold cavity under high pressure. The high-pressure environment helps the molten metal to fill every corner of the mold more fully and quickly. The close arrangement of the molten metal makes the microstructure inside the casting more compact, reducing the formation of pores and defects, thereby improving the strength and hardness of the casting. In addition, compared with normal pressure casting, the cooling rate of the molten metal in high-pressure casting is faster, and rapid cooling helps the casting to form a fine grain structure. The finer the grain structure, the more grain boundaries there are. The grain boundaries can effectively disperse and resist the stress generated by the outside world. Therefore, the retainer formed by high-pressure casting has a higher structural strength, can meet the working requirements such as variable loads and repeated starts, and improves the durability of the current wind power generation retainer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 This is a structural schematic diagram of a first embodiment of a high pressure casting wind power generation retainer of the present invention; Figure 2 It is a front view of a second embodiment of a high pressure casting wind power generation retainer of the present invention; Figure 3 It is a stereoscopic view of a second embodiment of a high pressure casting wind power generation retainer according to the present invention.

[0019] Description of Figure Numbers: 100, first arc segment; 200, second arc segment; 300, window beam; 310, cross beam; 320, rib; 321, first rib; 322, second rib; 323, third rib; 330, empty segment; 400, tapered roller; 410, upper segment; 420, lower segment; The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0021] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0022] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0024] The material of the existing wind turbine retainer is plastic, specifically polyurethane (PUM). Although polyurethane has a low density and has a relatively high power generation efficiency when used in wind turbines, its structural strength is low. After a period of use, it is very easy to cause structural damage, and the damage location is randomly distributed. Although the production cost is reduced, the subsequent maintenance and replacement work greatly increases the operation and maintenance cost. Therefore, it is necessary to improve the existing plastic wind turbine retainer.

[0025] Reference Figure 1~Figure 3The present invention provides a high pressure casting wind power generation retainer, which is enclosed by at least two sections of retainer units, each section of the retainer unit includes: A first arc segment 100; A second arc segment 200, which is arranged concentrically with the first arc segment 100 and is spaced a predetermined distance from the first arc segment 100; A window beam 300, one end of the window beam 300 is connected to the first arc segment 100, and the other end is connected to the second arc segment 200, a plurality of the window beams 300 are arranged at intervals, and the intervals between any two adjacent window beams 300 are the same and form pockets; The first arc segment 100 , the second arc segment 200 and the window beam 300 are integrally formed by high-pressure casting.

[0026] Wind power generation requires that wind turbines be set up in areas with large wind volume and high wind speed, such as mountain tops, seasides, and in the sea. The air in the mountain top area contains more moisture, while the seaside and sea areas are high salt fog areas, which will have different degrees of impact on the components of wind turbines. After comprehensive consideration of the above issues, a retainer made by a high-pressure casting process is proposed, which is formed by enclosing at least two sections of retainer units. During the high-pressure casting process, liquid metal is rapidly injected into the mold cavity under high pressure. The high-pressure environment helps the molten metal to fill every corner of the mold more fully and quickly. The close arrangement of the molten metal makes the microstructure inside the casting more compact, reduces the formation of pores and defects, and thus improves the strength and hardness of the casting. In addition, compared with normal pressure casting, the cooling speed of the molten metal in high pressure casting is faster, and rapid cooling helps the casting form a fine grain structure. The finer the grain structure, the more grain boundaries there are, and the grain boundaries can effectively disperse and resist the stress generated by the outside world. Therefore, the cage formed by high pressure casting has a higher structural strength, which can meet the working requirements of variable loads and repeated starts, and improves the durability of the current wind power generation cage. In addition, higher structural strength means that the cage is extremely difficult to deform, and the rolling element will also rotate along a more stable trajectory, ensuring that the wind power bearing can operate stably for a long time.

[0027] Before pouring the casting liquid, the casting mold needs to be preheated to prevent the high-temperature casting liquid from contacting the low-temperature mold, causing the metal liquid to solidify prematurely and affecting the casting effect. During the casting process, other measures can also be taken to further accelerate the cooling process of the metal liquid, shorten the cooling time of the metal liquid, reduce the thermal stress of the metal liquid during the solidification process, and further improve the structural strength of the casting. It should be noted that when accelerating the cooling of the casting, the cooling temperature of the casting needs to be controlled within a certain range to prevent the internal temperature of the casting from being too high compared to the external temperature and causing internal cracks.

[0028] In addition, the first arc segment 100, the second arc segment 200 and the window beam 300 are integrally formed. In traditional processing methods, multiple components need to be assembled by welding or other methods, and welding may produce defects such as welds, pores, slag inclusions, etc., resulting in reduced strength and durability of the product. Integral molding can avoid these problems. There are no gaps or weak points on the surface of the cage, which can prevent moisture, salt spray, etc. from entering the cage and causing corrosion inside.

[0029] Furthermore, aluminum metal is selected as the material for making the retaining frame.

[0030] Aluminum cages naturally have a dense oxide film, which can effectively prevent the cage from being corroded in harsh environments such as high salt spray, humidity, and large temperature differences, thereby maintaining stable performance for a long time. In addition, aluminum has high strength, which can meet the working requirements of wind power bearings with variable loads during operation, and can meet the bearing capacity of axial and radial loads.

[0031] In addition to its high structural strength, the aluminum cage is also lightweight. Among many common metals, aluminum has a lower density and is not much different from polyurethane. Therefore, after changing the material from polyurethane to aluminum, the overall mass of the cage increases slightly, but the structural strength increases significantly. In addition, aluminum itself has a relatively good thermal conductivity. During the rotation of the wind turbine bearing, a large amount of heat is generated. The aluminum cage can quickly conduct the heat away, keeping the bearing temperature within the normal temperature range.

[0032] When the current wind turbine retainer is worn during operation, the location of the damage is often uncertain, so it is difficult to optimize the key parts of the retainer in a targeted manner during the production process. After the wind turbine retainer fails due to wear, it usually takes 10 to 25 days of transportation and analysis to accurately determine the cause of the failure. The transportation and return to the factory for repair costs are as high as hundreds of thousands of yuan, which is extremely expensive.

[0033] In order to improve the overall durability of the wind turbine cage, a layer of plastic film is applied to the surface of the cage. Before coating, the friction between the cage and the rolling element, and between the inner and outer rings of the bearing is metal-to-metal friction, with a large friction coefficient and easy to wear; after coating, the friction between the cage and other components becomes friction between metal and plastic, and the friction environment is greatly improved. The plastic film is tight and smooth, and has the characteristics of chemical corrosion resistance, mildew resistance, wear resistance, noise reduction, self-lubrication, good buffering, and low friction coefficient, which provides effective protection for the cage and extends the service life of the cage.

[0034] Wind turbines encounter various wind conditions during the power generation process. When encountering turbulent wind conditions, the wind speed is extremely fast and the wind direction is unstable. At this time, the force on the wind turbine main shaft is complex. If the cage fails to rotate with the bearing in this case, it will cause a large degree of wear on the cage itself and other bearing components. After the cage is coated with plastic film, the rotation accuracy, response speed and service life of the wind turbine bearing are improved, and it can operate stably in complex wind conditions such as turbulent wind conditions.

[0035] Further, the window beam 300 includes a cross beam 310 and a rib plate 320, wherein the cross beam 310 connects the first arc segment 100 and the second arc segment 200, and the rib plate 320 is connected to the cross beam 310 and is located at least on one side of the cross beam 310. Pockets are formed between two adjacent window beams 300, the first arc segment 100 and the second arc segment 200 for accommodating rolling elements.

[0036] Since the tapered roller 400 has a strong load-bearing capacity, the tapered roller 400 is selected as the rolling element in this scheme. After the tapered roller 400 is installed in the pocket, the wrapping property of the cross beam 310 for the rolling element is relatively limited, and the wrapping property of the pocket is relatively poor, that is, the gap between the rolling element and the pocket is relatively large, which is not convenient for the lubrication of the rolling element and will also generate relatively large vibrations and noise during the operation of the rolling element. For this reason, ribs 320 are provided to improve the wrapping property of the pocket for the rolling element. After the ribs 320 are provided, the ribs 320 are located on both sides of the axial direction of the rolling element. Regardless of whether the rolling element rotates forward or reverse, the ribs 320 will abut against it to prevent it from deflecting during operation.

[0037] Further, see Figure 1 In the first embodiment, a rib 320 is provided on each side of the first arc segment 100, and the two ribs 320 are arranged in an alternating manner. That is, one side of the crossbeam 310 is a rib 320 and a vacant segment 330, and the opposite side of the larger vacant segment 330 is another rib 320. This arrangement of ribs 320 can wrap the rolling element while reducing the weight of the retaining frame. The function of a wind turbine is to generate electricity, so high power efficiency is the primary goal to be pursued. Lightweighting the retaining frame can reduce the energy consumption of the wind turbine during rotation, thereby more effectively converting wind energy into electrical energy. In addition to being set on land, some wind turbines are also set at sea. In particular, in offshore power generation projects, lightweight bearings help reduce transportation and installation costs. In addition, weight-reducing grooves can be provided on the ribs 320 to reduce the overall mass of the retaining frame.

[0038] Further, see Figure 2~Figure 3In the second embodiment, a rolling body is wrapped by three ribs 320, namely the first rib 321, the second rib 322 and the third rib 323, wherein the first rib 321 is located on one side of the first arc segment 100, and the second rib 322 and the third rib 323 are located on the other side of the arc segment, wherein the first rib 321 wraps the upper section 410 of the roller on one side, and the second rib 322 and the third rib 323 wrap the lower section 420 of the roller on both sides.

[0039] After adding the third rib 323, the wrapping property of the pocket for the rolling element is enhanced. Since the contact area between the lower section 420 of the tapered roller 400 and the pocket is greater than the contact area between the upper section 410 and the pocket, and the rotation radius of the lower section 420 of the roller is greater than the rotation radius of the upper section 410, the retainer at the lower section 420 of the roller will bear greater force during operation and is more likely to vibrate during rotation. By providing the third rib 323, the structural strength of the pocket in this part can be improved, and the vibration of the roller during operation can be reduced.

[0040] In addition, since the wind power bearing is relatively large in size, the assembly is relatively complicated. After the third rib 323 is provided, the rolling element will not slip after being assembled to the retaining frame, thereby improving the assembly efficiency of the wind power bearing.

[0041] In either the first or second embodiment, the empty section 330 not only reduces the weight of the retaining frame, but also provides a path for the flow of lubricating oil, so that during the operation of the bearing, the lubricating oil can flow from one pocket to another pocket to provide lubrication for the rolling elements.

[0042] Furthermore, the structure of the rib 320 is a curved ladder, and the ladder has a first end face and a second end face, wherein the second end face of the rib 320 is connected to the crossbeam 310. In addition to wrapping the rolling element, the rib 320 also has the function of enhancing the structural strength of the cage. The rib 320 in the shape of a ladder can effectively improve the bending resistance of the structure. During the rotation of the rolling element, the rolling element will abut against the crossbeam 310 to generate stress. Since the rolling element is a columnar structure, the rolling element will contact the crossbeam 310 and the rib 320 at the same time, increasing the contact area so that the contact stress distribution is more uniform, and reducing the possibility of deformation of the cage caused by the extrusion of the rolling element. In addition, the rib 320 in the ladder structure can distribute the stress more reasonably, reduce fatigue and damage of the cage, and extend the service life.

[0043] Compared with the ribs 320 of other shapes such as rectangle and semicircle, the ribs 320 of the ladder structure can reduce the use of unnecessary materials and achieve lightweight while maintaining sufficient strength.

[0044] The present invention also proposes a bearing, which includes a retaining frame, an inner ring, an outer ring and rolling elements as described above. Specifically, the specific structure of the retaining frame refers to the above embodiment. Since the bearing adopts all the technical solutions of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be repeated here one by one.

[0045] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A high pressure casting wind power generation retainer, which is enclosed by at least two retainer units, characterized in that: Each cage unit consists of: The first arc segment; a second arc segment, which is arranged concentrically with the first arc segment and is spaced a predetermined distance from the first arc segment; A window beam, one end of which is connected to the first arc segment, and the other end of which is connected to the second arc segment, a plurality of window beams are arranged at intervals, and two adjacent window beams form a pocket; The first arc segment, the second arc segment and the window beam are integrally formed by high-pressure casting.

2. The high pressure casting wind power generation retainer according to claim 1, characterized in that: The first arc segment, the second arc segment and the window beam are made of cast aluminum high pressure casting.

3. The high pressure casting wind power generation retainer according to claim 1, characterized in that: The window beam comprises: a crossbeam, one end of which is connected to the first arc segment, and the other end of which is connected to the second arc segment; A rib plate is connected to the cross beam and is located on at least one side of the cross beam.

4. The high pressure casting wind power generation retainer according to claim 3, characterized in that: A rib is respectively arranged on the crossbeam on both sides of the pocket, the two ribs are located on both sides of the first arc segment, and the two ribs are bent towards each other, and the two ribs are staggered along the direction from the first arc segment to the second arc segment.

5. The high pressure casting wind power generation retainer according to claim 4, characterized in that: The rib plate of the same pocket close to the first arc segment is the first rib plate, the other rib plate is the second rib plate, and also includes a third rib plate. The third rib plate and the second rib plate are located on the same side of the first arc segment, and along the direction from the first arc segment to the second arc segment, the third rib plate and the second rib plate are arranged at the same height, and the third rib plate and the second rib plate are bent opposite to each other.

6. The high pressure casting wind power generation retainer according to claim 5, characterized in that: The pocket accommodates the tapered roller, and the roller is gradually tightened from the lower section to the upper section. The first rib wraps the upper section, and the second rib and the third rib wrap the lower section.

7. The high pressure casting wind power generation retainer according to claim 3, characterized in that: The rib plate has a first end surface and a second end surface. The rib plate is gradually tightened along the direction from the second end surface to the first end surface. The cross beam connects the second end surface of the rib plate.

8. The high pressure casting wind power generation retainer according to claim 4, characterized in that: Along the direction of the cross beam, both sides of the rib plate have empty sections.

9. The high pressure casting wind power generation retainer according to claim 1, characterized in that: The surfaces of the first arc segment, the second arc segment and the window beam are covered with a plastic film.

10. A bearing, characterized in that: include: Inner circle; Outer ring; And a high pressure casting wind power generation retaining frame as claimed in any one of claims 1 to 9.

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