Servo valve connecting rod mechanism of axial-flow fan with adjustable movable blades
By adopting a first and second bushing mating structure in the servo valve linkage mechanism of the adjustable axial flow fan, the problem of easy damage to the linkage mechanism is solved, the service life is extended, the maintenance cost is reduced, and the safety is improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUONENG CHONGQING WANZHOU ELECTRIC POWER CO LTD
- Filing Date
- 2025-06-20
- Publication Date
- 2026-05-12
AI Technical Summary
The servo valve linkage mechanism of the adjustable blade axial flow fan is prone to damage, which can lead to fan shutdown, affect the safe operation of the unit, and cause economic losses.
The linkage structure, which includes a first bushing assembly and a second bushing assembly, improves the connection conditions of the linkage mechanism, reduces friction and wear, extends service life, and reduces maintenance costs through its detachable design.
It extends the service life of the linkage mechanism, reduces maintenance costs, improves safety performance, and avoids the risk of wind turbine downtime due to damage.
Smart Images
Figure CN224229394U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of linkage mechanisms, and more specifically, to a linkage mechanism for a servo valve of an adjustable axial flow fan. Background Technology
[0002] In some power generation devices, it is necessary to use the servo valve connecting rod spare parts for adjustable axial flow fans. The fan blade adjustment process is as follows: the external actuator drives the rotating shaft and shift fork to rotate, and the internal connecting rod drives the servo valve to control the hydraulic cylinder to enter and exit oil, thereby controlling the piston of the hydraulic cylinder to move axially. The hydraulic cylinder drives the thrust plate and blade assembly to move, thereby adjusting the opening of the blade.
[0003] Due to the design of the servo valve linkage mechanism and the vibration of moving parts, the linkage mechanism is often damaged or detached, which forces the fan to shut down and causes the unit to operate at reduced load. If the adjustment is not timely, it may even lead to unplanned shutdown of the unit, posing a threat to the safe operation of the unit and causing greater economic losses. Utility Model Content
[0004] This application provides a servo valve linkage mechanism for an adjustable-blade axial flow fan to solve the problem of frequent damage to the linkage mechanism of fans in the prior art.
[0005] According to this application, a servo valve linkage mechanism for an adjustable axial flow fan includes: a servo valve assembly, which includes a first shift fork; a first bushing assembly, which includes a first rotating shaft and a first bushing, wherein the first rotating shaft is installed inside the first shift fork and the first bushing is sleeved on the circumferential outer side of the first rotating shaft; a linkage assembly, wherein a first end of the linkage assembly is rotatably sleeved on the circumferential outer side of the first bushing; and a second bushing assembly, which includes a second rotating shaft and a second bushing, wherein the second rotating shaft is connected to the servo valve and the second bushing is sleeved on the circumferential outer side of the second rotating shaft, and a second end of the linkage assembly is rotatably sleeved on the circumferential outer side of the second bushing.
[0006] Furthermore, the first bushing has a first limiting part and a second limiting part, which are located on both sides of the first end of the connecting rod assembly.
[0007] Furthermore, the first bushing includes a first bushing body, and the first limiting part and the second limiting part are both protruding rings protruding from the outer wall of the first bushing body. The distance between the first limiting part and the second limiting part is equal to the thickness of the first end of the connecting rod assembly.
[0008] Furthermore, the first bushing includes a first sub-shoulder section and a second sub-shoulder section, with a first limiting part located in the first sub-shoulder section and a second limiting part located in the second sub-shoulder section.
[0009] Furthermore, the connecting rod assembly includes a connecting rod body, a first connecting rod bushing, and a bearing. The first connecting rod bushing is detachably connected to the first end of the connecting rod body. The first connecting rod bushing is interference-fitted with the outer ring of the bearing, and the inner ring of the bearing is located circumferentially outside the first bushing.
[0010] Furthermore, the first end of the connecting rod body has a first internal threaded hole, and the first connecting rod bushing has a first external threaded rod that is adapted to the first internal threaded hole.
[0011] Furthermore, the linkage assembly also includes a second linkage bushing, which is detachably connected to the second end of the linkage body and is sleeved on the circumferential outer side of the second bushing.
[0012] Furthermore, the second end of the connecting rod body has a second internal threaded hole, and the second connecting rod bushing has a second external threaded rod that is adapted to the second internal threaded hole.
[0013] Furthermore, the diameter of the first bushing is larger than the inner diameter of the hole in the first shift fork.
[0014] Furthermore, the second bushing assembly also includes a second shift fork, which is connected to the servo valve. A second rotating shaft passes through the second shift fork, and the second bushing is located between the two branches of the second shift fork.
[0015] By applying the technical solution of this application, in the structure where the two ends of the connecting rod assembly mate with the first and second bushing assemblies, the connection conditions of the connecting rod mechanism are greatly improved and its service life is extended through the cooperation of the first and second bushings. The friction and wear between the first and second bushings reduce the friction and wear of the first and second rotating shafts, thereby extending their service life. Even if friction and wear occur, in the short term, the first and second bushings can be replaced; in the long term, the first bushing, first rotating shaft, second bushing, and second rotating shaft can be replaced simultaneously, reducing operating costs and improving safety performance. The technical solution of this application effectively solves the problem of frequent damage to the connecting rod mechanism of wind turbines in the prior art. Attached Figure Description
[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.
[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1A schematic diagram of the linkage mechanism according to an embodiment of this application is shown;
[0019] Figure 2 It shows Figure 1 A schematic diagram of the internal structure of a linkage mechanism;
[0020] Figure 3 It shows Figure 1 A cross-sectional schematic diagram of the first split-shaft sleeve section of the linkage mechanism;
[0021] Figure 4 It shows Figure 1 A schematic diagram of the structure of the second bushing assembly of the linkage mechanism;
[0022] Figure 5 It shows Figure 1 A schematic diagram of the main body of the linkage mechanism;
[0023] Figure 6 It shows Figure 5 A structural schematic diagram of the connecting rod body from another angle.
[0024] The above figures include the following reference numerals:
[0025] 10. Servo valve assembly; 20. First bushing assembly; 21. First rotating shaft; 22. First bushing; 221. First limiting part; 222. Second limiting part; 223. First sub-shoulder sleeve segment; 224. Second sub-shoulder sleeve segment; 30. Connecting rod assembly; 31. Connecting rod body; 32. First connecting rod bushing; 33. Bearing; 34. Second connecting rod bushing; 40. Second bushing assembly; 41. Second rotating shaft; 42. Second bushing. Detailed Implementation
[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.
[0027] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.
[0028] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, rotated 90 degrees, or in other orientations, and the spatial relative descriptions used herein will be interpreted accordingly.
[0029] like Figures 1 to 6 As shown, the servo valve linkage mechanism of the adjustable axial flow fan in this embodiment includes: a servo valve assembly 10, a first bushing assembly 20, a linkage assembly 30, and a second bushing assembly 40. The servo valve assembly 10 includes a first shift fork. The first bushing assembly 20 includes a first rotating shaft 21 and a first bushing 22. The first rotating shaft 21 is installed inside the first shift fork, and the first bushing 22 is sleeved on the circumferential outer side of the first rotating shaft 21. The first end of the linkage assembly 30 is rotatably sleeved on the circumferential outer side of the first bushing 22. The second bushing assembly 40 includes a second rotating shaft 41 and a second bushing 42. The second rotating shaft 41 is connected to the servo valve, and the second bushing 42 is sleeved on the circumferential outer side of the second rotating shaft 41. The second end of the linkage assembly 30 is rotatably sleeved on the circumferential outer side of the second bushing 42.
[0030] By applying the technical solution of this application, in the structure where the two ends of the connecting rod assembly 30 cooperate with the first bushing assembly 20 and the second bushing assembly 40, the connection conditions of the connecting rod mechanism are greatly improved and the service life of the connecting rod mechanism is extended through the cooperation of the first bushing 22 and the second bushing 42. Through the friction and wear between the first bushing 22 and the first rotating shaft 21, and between the second rotating shaft 41 and the second bushing 42, the friction and wear of the first rotating shaft 21 and the second rotating shaft 41 are reduced, thereby extending the service life of the first rotating shaft 21 and the second rotating shaft 41. Even if friction and wear occur, in the short term, the first bushing 22 and the second bushing 42 can be replaced; in the long term, the first bushing 22, the first rotating shaft 21, the second bushing 42, and the second rotating shaft 41 can be replaced simultaneously, reducing operating costs and improving safety performance. The technical solution of this embodiment effectively solves the problem of frequent damage to the connecting rod mechanism of the wind turbine in the prior art.
[0031] like Figure 2As shown, in this embodiment, the first bushing 22 has a first limiting portion 221 and a second limiting portion 222, which are located on both sides of the first end of the connecting rod assembly 30. The first limiting portion 221 and the second limiting portion 222 ensure that the first end of the connecting rod assembly 30 is less prone to axial movement. Since the connecting rod assembly 30 is subjected to an axial force along the first bushing 22, the presence of the first limiting portion 221 and the second limiting portion 222 effectively counteracts the axial force on the connecting rod assembly 30, preventing axial movement. This structure makes the movement of the connecting rod assembly 30 smoother and can even prevent the connecting rod assembly 30 from jamming.
[0032] like Figure 2 and Figure 3 As shown, in the technical solution of this embodiment, the first bushing 22 includes a first bushing body, and the first limiting part 221 and the second limiting part 222 are both protruding rings protruding from the outer wall of the first bushing body. The distance between the first limiting part 221 and the second limiting part 222 is equal to the thickness of the first end of the connecting rod assembly 30. The above structure has low cost and is easy to operate.
[0033] like Figure 2 and Figure 3 As shown, in this embodiment, the first bushing 22 includes a first sub-shoulder segment 223 and a second sub-shoulder segment 224. A first limiting part 221 is located in the first sub-shoulder segment 223, and a second limiting part 222 is located in the second sub-shoulder segment 224. This structure facilitates the assembly and disassembly of the first bushing assembly 20. In use, the first sub-shoulder segment 223 and the second sub-shoulder segment 224 are first placed into the hole at the first end of the connecting rod assembly 30, then placed between the two branches of the first shift fork, and finally the first rotating shaft 21 is inserted into the first shift fork and the first bushing 22. It should be noted that in this embodiment, the first sub-shoulder segment 223 and the second sub-shoulder segment 224 are the same, that is, the first bushing 22 is split in the middle into the first sub-shoulder segment 223 and the second sub-shoulder segment 224. The materials of the first bushing 22 and the second bushing 42 are both high-carbon steel or bearing steel.
[0034] like Figures 2 to 5 As shown, in this embodiment, the connecting rod assembly 30 includes a connecting rod body 31, a first connecting rod bushing 32, and a bearing 33. The first connecting rod bushing 32 is detachably connected to the first end of the connecting rod body 31. The first connecting rod bushing 32 and the outer ring of the bearing 33 are interference-fitted, and the inner ring of the bearing 33 is located circumferentially outside the first bushing 32. The bearing 33 reduces friction. It should be noted that the diameter of the first rotating shaft 21 remains unchanged, the same as in the prior art. However, due to the addition of the first bushing 22, the bore diameter of the first connecting rod bushing 32 at the first end of the connecting rod assembly 30 is increased.
[0035] like Figure 5 and Figure 6 As shown, in this embodiment, the first end of the connecting rod body 31 has a first internal threaded hole, and the first connecting rod bushing 32 has a first external threaded rod that matches the first internal threaded hole. The above structure is easy to assemble and disassemble, and has low processing costs. During use, the first connecting rod bushing 32 and the connecting rod body 31 are tightened or loosened by relative rotation. It should be noted that other connection methods are also possible for the first connecting rod bushing 32 and the connecting rod body 31, such as welding. Of course, it is also possible for the first connecting rod bushing 32 and the connecting rod body 31 to be an integrally formed structure.
[0036] like Figures 2 to 6 As shown in the technical solution of this embodiment, the connecting rod assembly 30 further includes a second connecting rod bushing 34. The second connecting rod bushing 34 is detachably connected to the second end of the connecting rod body 31, and is sleeved on the circumferential outer side of the second bushing. The provision of the second connecting rod bushing 34 ensures that even if the second connecting rod bushing 34 wears out, only the second connecting rod bushing 34 needs to be replaced, without replacing the entire connecting rod assembly 30, thus further saving costs. It should be noted that the material of the second connecting rod bushing 34 can also be changed without altering the entire connecting rod assembly 30. The same principle applies to the first connecting rod bushing, and will not be elaborated further here.
[0037] like Figure 2 and Figure 5 As shown, in this embodiment, the second end of the connecting rod body 31 has a second internal threaded hole, and the second connecting rod bushing 34 has a second external threaded rod that matches the second internal threaded hole. This structure is easy to assemble and disassemble. Furthermore, the axial length of the connecting rod assembly 30 can be easily adjusted, reducing machining accuracy. It should be noted that the first threaded rod has a first locking nut, and the second threaded rod has a second locking nut, thus preventing the connecting rod body 31 and the first connecting rod bushing 32, as well as the connecting rod body 31 and the second connecting rod bushing 34, from easily loosening or changing the length of the connecting rod assembly 30.
[0038] like Figure 2 As shown, in this embodiment, the diameter of the first bushing 22 is larger than the inner diameter of the hole in the first shift fork. This structure provides the first bushing 22 with a certain limiting function, making it less prone to axial misalignment.
[0039] In this embodiment, the second bushing assembly 40 further includes a second shift fork connected to the servo valve. A second rotating shaft 41 passes through the second shift fork, and a second bushing 42 is located between the two branches of the second shift fork. The diameter of the second bushing 42 is larger than the inner diameter of the holes in the two branches of the second shift fork. The second bushing assembly 40 and the second end of the connecting rod assembly 30, as described above, have a relatively smooth fit.
[0040] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0041] It should be noted that 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. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. 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 processes, methods, products, or apparatus.
[0042] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A servo valve linkage mechanism for an adjustable-blade axial flow fan, characterized in that, include: Servo valve assembly (10), the servo valve assembly (10) including a first shift fork; The first bushing assembly (20) includes a first rotating shaft (21) and a first bushing (22). The first rotating shaft (21) is installed inside the first shift fork, and the first bushing (22) is sleeved on the circumferential outer side of the first rotating shaft (21). Linkage assembly (30), the first end of which is rotatably sleeved on the circumferential outer side of the first bushing (22); The second bushing assembly (40) includes a second rotating shaft (41) and a second bushing (42). The second rotating shaft (41) is connected to the servo valve, and the second bushing (42) is sleeved on the circumferential outer side of the second rotating shaft (41). The second end of the connecting rod assembly (30) is rotatably sleeved on the circumferential outer side of the second bushing (42).
2. The servo valve linkage mechanism for an adjustable axial flow fan according to claim 1, characterized in that, The first bushing (22) has a first limiting part (221) and a second limiting part (222), which are located on both sides of the first end of the connecting rod assembly (30).
3. The servo valve linkage mechanism for an adjustable axial flow fan according to claim 2, characterized in that, The first bushing (22) includes a first bushing body, and the first limiting part (221) and the second limiting part (222) are both protruding rings protruding from the outer wall of the first bushing body. The distance between the first limiting part (221) and the second limiting part (222) is equal to the thickness of the first end of the connecting rod assembly (30).
4. The servo valve linkage mechanism for an adjustable axial flow fan according to claim 2, characterized in that, The first bushing (22) includes a first bushing segment (223) and a second bushing segment (224), with the first limiting part (221) located in the first bushing segment (223) and the second limiting part (222) located in the second bushing segment (224).
5. The servo valve linkage mechanism for an adjustable axial flow fan according to any one of claims 1 to 4, characterized in that, The connecting rod assembly (30) includes a connecting rod body (31), a first connecting rod bushing (32), and a bearing (33). The first connecting rod bushing (32) is detachably connected to the first end of the connecting rod body (31). The first connecting rod bushing (32) is interference-fitted with the outer ring of the bearing (33). The inner ring of the bearing (33) is located circumferentially outside the first bushing (22).
6. The servo valve linkage mechanism for an adjustable axial flow fan according to claim 5, characterized in that, The first end of the connecting rod body (31) has a first internal threaded hole, and the first connecting rod bushing (32) has a first external threaded rod that is adapted to the first internal threaded hole.
7. The servo valve linkage mechanism for an adjustable axial flow fan according to claim 5, characterized in that, The connecting rod assembly (30) further includes a second connecting rod bushing (34), which is detachably connected to the second end of the connecting rod body (31) and is sleeved on the circumferential outer side of the second bushing.
8. The servo valve linkage mechanism for an adjustable axial flow fan according to claim 7, characterized in that, The second end of the connecting rod body (31) has a second internal threaded hole, and the second connecting rod bushing (34) has a second external threaded rod that is adapted to the second internal threaded hole.
9. The servo valve linkage mechanism for an adjustable axial flow fan according to claim 5, characterized in that, The diameter of the first bushing (22) is greater than the inner diameter of the hole of the first shift fork.
10. The servo valve linkage mechanism for an adjustable axial flow fan according to claim 1, characterized in that, The second bushing assembly (40) also includes a second shift fork, which is connected to the servo valve. The second rotating shaft (41) passes through the second shift fork, and the second bushing is located between the two branches of the second shift fork.