A drive mechanism for driving adjustable vanes

Abstract

The application discloses a driving mechanism for driving adjustable guide vanes, comprising a driving ring (7), a plurality of linkage devices and a plurality of adjustable guide vanes (10) uniformly distributed along the circumference; the linkage device is fixed on the driving ring (7) and used for connecting the adjustable guide vane (10), and the linkage device and the adjustable guide vane (10) are in one-to-one correspondence; the linkage device comprises a driving ball head (8), a driving ball head sliding block (9) and a driving swing arm (11); the driving ball head (8) is fixed on the outer circumferential surface of the driving ring (7), the outer periphery of the driving ball head (8) is successively sleeved with the first aperture (111) of the driving ball head sliding block (9) and the driving swing arm (11), the second aperture (112) of the driving swing arm (11) is used for fixing the blade handle (101) of the adjustable guide vane, and the axis of the blade handle (101) of the adjustable guide vane is parallel to the plane where the driving ring (7) is located.

Description

Technical Field

[0001] This invention relates to a drive mechanism for driving adjustable guide vanes, which can rotate the adjustable guide vanes to adjust the airflow angle of the flow field in front of the downstream blades, thereby improving the flow state. It is applicable to gas turbines, aero engines, and various axial flow turbomachinery. Background Technology

[0002] Heavy-duty gas turbines are power plants that occupy an important strategic position in the energy and power industry due to their cleanliness, flexibility, and high efficiency. Adjustable guide vanes are an important component of gas turbines and a common means of regulating the operating conditions of gas turbines. Their working principle is to adjust the angle of the guide vanes, thereby adjusting the angle of the airflow entering the blade passage.

[0003] Existing technology 1: Publication number CN114278611A, invention entitled "Adjustable Guide Vane Structure and Control Method for Turbocharger Compressor," discloses the following technical solution: a drive ring is sleeved outside the intake manifold, the free end of an electric valve stem is connected to the drive ring, and multiple adjusting components are circumferentially distributed outside the drive ring. Each adjusting component includes a drive column, a drive joint, and a drive column. The drive ring connects to the drive column, the drive column connects to the drive joint, the drive joint connects to the drive column, and the drive column connects to the rotation shaft of the corresponding adjustable guide vane. This drive mechanism requires a large driving force, thus requiring a high stiffness of the drive ring. Insufficient stiffness of the drive ring will result in greater deformation near the outer ring than the inner ring, leading to asynchronous movement of the inner and outer rings. Compensating for axial position through the movement of the drive ring requires a sliding mechanism, and compensating for radial position through the torsion of an elastic plate requires a large driving force, resulting in decreased reliability.

[0004] Prior art 2: Publication number CN115638132A, invention titled "Adjustable Guide Vanes for a Megawatt-Level Cryogenic Centrifugal Air Compressor," describes a pneumatic actuator connected to a drive rod, which rotates the drive rod. The drive rod then rotates the main connecting plate and the drive blades coaxially. Simultaneously, the main connecting plate rotates, driving a rotating ring via a main spherical bearing. The rotating ring and the adjustable guide vane retaining ring form a cylindrical pair, causing the rotating ring to rotate and translate axially. The rotating ring drives 10 driven blades to rotate via a secondary spherical bearing and a secondary connecting plate. This structure has a relatively large drive mechanism module, limiting the number of adjustable guide vanes that can be arranged. Summary of the Invention

[0005] Based on the above background, in order to solve the problems of radial and axial displacement difference, large space occupation of adjustable guide vane drive mechanism module and small number of adjustable guide vanes in existing adjustable guide vanes, the present invention provides a drive mechanism for driving adjustable guide vanes.

[0006] To achieve the above objectives, one aspect of the present invention provides a drive mechanism for driving adjustable guide vanes, comprising: a drive ring, multiple linkage devices, and multiple adjustable guide vanes evenly distributed along the circumference; the linkage devices are fixed on the drive ring and are used to connect the adjustable guide vanes, with each linkage device corresponding to one of the adjustable guide vanes; each linkage device includes a drive ball head, a drive ball head slider, and a drive swing arm; the tail of the drive ball head is a threaded cylinder fixed to the outer circumferential surface of the drive ring, and the head of the drive ball head is a sphere, with the drive ball head slider and the first opening of the drive swing arm layered around its periphery, the drive ball head slider sliding within the first opening; the second opening of the drive swing arm is used to fix the stalk of the adjustable guide vane, such that the axis of the stalk of the adjustable guide vane is parallel to the plane of the drive ring, and the adjustable guide vane rotates around the axis of the stalk of the adjustable guide vane under the drive of the drive ring and the linkage devices.

[0007] Optionally, the drive mechanism for driving adjustable guide vanes includes: a casing flange, wherein a drive ring rotation groove is provided on the outer circumferential surface of the flange near the casing mating surface, which slides in cooperation with the inner circumferential surface of the drive ring, and the drive ring can rotate along the drive ring rotation groove on the outer circumferential surface of the casing flange; the casing flange is divided into two parts by the symmetrical centerline of the cross-section of the drive ring, namely a front casing flange and a rear casing flange; below the drive ring rotation groove on the outer circumferential surface of the casing flange, through holes are provided perpendicular to the casing mating surface, evenly distributed along the circumference, for inserting bolts to connect the front casing flange and the rear casing flange; downstream of the rear casing flange along the air intake direction, a plurality of radially distributed through holes are provided along the circumferential direction, corresponding one-to-one with the adjustable guide vanes, and the blade stalks of the adjustable guide vanes are inserted one by one into the through holes, and the adjustable guide vanes rotate around the axis of the blade stalks in the radial through holes.

[0008] Optionally, the drive mechanism for driving the adjustable guide vane includes: a blade root shaft copper seat with a round hole at its top, which is fitted onto the blade root shaft of the adjustable guide vane; a hub flange located inside the casing flange, with its axis coinciding with the axis of the casing flange, and multiple grooves arranged circumferentially on its outer circumferential surface near the hub mating surface, corresponding one-to-one with the adjustable guide vane, for fixing the blade root shaft copper seat so that the blade surface of the adjustable guide vane is located between the casing flange and the hub flange.

[0009] Optionally, the hub flange is divided into a front hub flange and a rear hub flange along its hub mating surface; the fixing groove of the blade root shaft copper seat is provided on the outer circumferential surface of the rear hub flange; below the hub mating surface of the front hub flange and the rear hub flange, perpendicular to the hub mating surface, through holes distributed circumferentially are provided for inserting bolts to connect the front hub flange and the rear hub flange.

[0010] Optionally, the drive mechanism for driving adjustable guide vanes further includes: a push-pull rod with a through hole at its end; a push-pull rod pin that cooperates with a nut to connect the end of the push-pull rod to one end of a push-pull rod connecting seat, the push-pull rod rotating around the push-pull rod pin; and a push-pull rod connecting seat parallel to the plane of the drive ring, one end of which is fixed to the side of the drive ring, and the other end located on the radial extension line of the drive ring.

[0011] Optionally, the drive mechanism for driving the adjustable guide vane includes: a blade shank copper sleeve, disposed within the radial through hole of the rear casing flange, penetrating the radial through hole of the rear casing flange, and sleeved on the blade shank of the adjustable guide vane; and a sealing ring, disposed at the seam between the adjustable guide vane and the surface of the radial through hole of the rear casing flange, and sleeved in the annular groove of the blade shank of the adjustable guide vane.

[0012] Optionally, an angular displacement measuring mechanism is mounted on the top of the stalk of one of the plurality of adjustable guide vanes.

[0013] Optionally, in the initial state, the blade surface of the adjustable guide vane and the corresponding linkage device are on the same plane; relative to this initial state plane, the deflection angle of the adjustable guide vane is in the range of ±30°.

[0014] Optionally, the first opening of the drive arm is rectangular and the second opening is square; the part of the adjustable guide vane whose shank is fixed by the drive arm is square, and the part passing through the rear casing flange is round.

[0015] Optionally, the adjustable guide vane has a streamlined blade surface.

[0016] The above-described technical solutions employed in the embodiments of the present invention can achieve the following beneficial effects:

[0017] (1) The adjustable guide vane of the present invention can rotate flexibly within the allowable range of deflection angle to control the airflow direction of the fluid. Since the airflow direction of the fluid can be controlled by adjusting the deflection angle, the present invention makes the control of the airflow direction of the fluid more precise and convenient.

[0018] (2) The present invention drives the ball head slider to slide in the first hole of the drive arm along the extension direction of the drive arm. The ball head slider and the drive arm are in surface contact, which effectively solves the axial and radial position movement during the rotation process, making the rotation smooth and stable.

[0019] (3) The present invention has a compact structure and small size. The sealing performance of the present invention is good through the setting of sealing ring, blade root shaft copper seat, etc., and the leakage of the medium is controlled at a very low level.

[0020] (4) The present invention only requires pushing the push-pull rod to adjust the deflection angle of the adjustable guide vane. The driving force required to push the push-pull rod is small, the push-pull rod connecting seat and the drive swing arm are not easily deformed, and the deflection angle adjustment of the adjustable guide vane is highly consistent.

[0021] (5) The present invention can set a large number of adjustable guide vanes, and the number of adjustable guide vanes can be increased or decreased according to actual needs. Only the number of corresponding linkage devices needs to be increased, without redesigning the structure of the drive mechanism. Therefore, the present invention has greater inclusiveness and stronger flexibility. Attached Figure Description

[0022] To gain a more complete understanding of the invention and its advantages, reference will now be made to the following description taken in conjunction with the accompanying drawings, wherein:

[0023] Figure 1 The diagram illustrates a three-dimensional solid model axonometric view of a drive mechanism for driving adjustable guide vanes provided in an embodiment of the present invention (excluding the casing flange and hub flange).

[0024] Figure 2 The illustration shows a cross-sectional view of a drive mechanism for driving adjustable guide vanes according to an embodiment of the present invention.

[0025] Figure 3 The illustration schematically shows a front view (excluding the casing flange and hub flange) of a drive mechanism for driving adjustable guide vanes provided in an embodiment of the present invention.

[0026] Figure 4 The illustration schematically shows a side view (excluding the casing flange and hub flange) of a drive mechanism for driving adjustable guide vanes according to an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1-Push-pull rod, 2-Push-pull rod pin, 3-Nut, 4-Push-pull rod connecting seat, 5-Front casing flange, 51-Casing mating surface, 6-Rear casing flange, 7-Drive ring, 71-Drive ring rotating groove, 8-Drive ball head, 9-Drive ball head slider, 10-Adjustable guide vane, 101-Adjustable guide vane stalk, 102-Adjustable guide vane blade surface, 103-Adjustable guide vane root, 11-Drive swing arm, 111-First orifice, 112-Second orifice, 12-Stalk copper sleeve, 13-Sealing ring, 14-Blade root shaft copper seat, 15-Front hub flange, 151-Hub mating surface, 16-Rear hub flange. Detailed Implementation

[0029] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the invention for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0030] An embodiment of the present invention provides a driving mechanism for driving adjustable guide vanes, characterized in that it includes: a driving ring 7, multiple linkage devices, and multiple adjustable guide vanes 10 evenly distributed along the circumference; the linkage devices are fixed on the driving ring 7 and are used to connect the adjustable guide vanes 10, with each linkage device and adjustable guide vane 10 corresponding to one another; the linkage device includes a driving ball head 8, a driving ball head slider 9, and a driving swing arm 11; the tail of the driving ball head 8 is a threaded cylinder fixed to the outer circumferential surface of the driving ring 7, and the head of the driving ball head 8 is a sphere, with the driving ball head slider 9 and the first opening 111 of the driving swing arm 11 layer by layer around its periphery, the driving ball head slider 9 sliding within the first opening 111; the second opening 112 of the driving swing arm 11 is used to fix the blade stalk 101 of the adjustable guide vane, so that the axis of the blade stalk 101 of the adjustable guide vane is parallel to the plane of the driving ring 7, and the adjustable guide vane 10 rotates around the axis of the blade stalk 101 of the adjustable guide vane under the drive of the driving ring 7 and the linkage devices. This device solves the problems of radial and axial displacement difference in existing adjustable guide vanes, large space occupation of adjustable guide vane drive mechanism modules, and small number of adjustable guide vanes. It has the advantages of high flexibility and high feasibility and can be applied to the field of gas turbine technology.

[0031] Figure 1 The diagram illustrates a three-dimensional solid model axonometric view of a drive mechanism for driving adjustable guide vanes provided in an embodiment of the present invention (excluding the casing flange and hub flange).

[0032] like Figure 1As shown in the figure, an embodiment of the present invention provides a driving mechanism for driving adjustable guide vanes, characterized in that it includes: a driving ring 7, multiple linkage devices and multiple adjustable guide vanes 10 evenly distributed along the circumference; the linkage devices are fixed on the driving ring 7 and are used to connect the adjustable guide vanes 10, and the linkage devices and the adjustable guide vanes 10 correspond one-to-one.

[0033] Figure 2 The diagram schematically illustrates a cross-sectional view of a drive mechanism for driving adjustable guide vanes according to an embodiment of the present invention. Figure 2 As shown, the linkage device includes a drive ball head 8, a drive ball head slider 9, and a drive swing arm 11. The tail of the drive ball head 8 is a threaded cylinder, which is fixed to the outer circumferential surface of the drive ring 7. The head of the drive ball head 8 is a sphere, and the drive ball head slider 9 and the first hole 111 of the drive swing arm 11 are successively fitted around its periphery. The drive ball head slider 9 slides in the first hole 111. The second hole 112 of the drive swing arm 11 is used to fix the blade stalk 101 of the adjustable guide vane, so that the axis of the blade stalk 101 of the adjustable guide vane is parallel to the plane of the drive ring 7. Under the drive of the drive ring 7 and the linkage device, the adjustable guide vane 10 rotates around the axis of the blade stalk 101 of the adjustable guide vane.

[0034] In this embodiment, the length of the first opening 111 of the drive swing arm 11 is greater than the length of the drive ball head slider 9, and the width of the first opening 111 is equal to the width of the drive ball head slider 9. Therefore, a gap is left between the drive ball head slider 9 and the first opening 111. The drive ball head slider 9 can slide along the long side of the first opening 111 within the first opening 111, that is, the drive ball head slider 9 can slide along the extension direction of the drive swing arm 11. Since the first opening 111 of the drive swing arm 11 is fitted outside the drive ball head slider 9, the drive ball head slider 9 can also slide up and down in a direction parallel to the axis of the drive ball head 8 within the first opening 111. When the drive ring 7 is disturbed and rotates slightly, this gap can absorb the disturbance and will not have any effect on the deflection angle of the adjustable guide vane. Furthermore, since there is a gap between the long side of the first opening 111 of the drive ball head slider 9 and the drive swing arm 11, and the first opening 111 of the drive swing arm 11 is a square hole, under the drive of the drive ring 7, the drive ball head slider 9 drives the drive swing arm 11 to rotate in a surface contact manner, thereby adjusting the deflection angle of the adjustable guide vane.

[0035] The connection between the drive ball head 8, the drive ball head slider 9, and the drive swing arm 11, in addition to absorbing minor disturbances to the drive ring 7, can also absorb the axial and radial displacements relative to the drive ring 7 caused by the relative changes in the positions of the drive ball head 8, the drive ball head slider 9, and the first orifice 111 of the drive swing arm 11 under the drive of the drive ring 7, through the sliding of the drive ball head slider 9 within the first orifice 111. Under the drive of the drive ring 7, the drive ball head 8 rotates with the drive ring 7, and at this time, the drive ball head slider 9 rotates relative to the drive ball head 8, with the axis of rotation of the drive ball head slider 9 being the axis of the drive ball head 8. Since the first orifice 111 and the second orifice 112 of the drive swing arm 11 are square holes, and The first opening 111 of the drive arm 11 is fitted onto the outside of the drive ball head slider 9. Therefore, when the drive ball head slider 9 rotates relative to the drive ball head 8, the drive arm 11 rotates with its second opening 112 as the axis (i.e., the axis of the adjustable guide vane's stalk 101). Since the adjustable guide vane's stalk 101 is fixed by the drive arm 11 with a square handle, the rotation of the drive arm 11 will cause the adjustable guide vane 10 to rotate around the axis of its stalk, thereby changing the deflection angle of the adjustable guide vane's blade surface 102 (the adjustable guide vane's blade surface 102 and the corresponding linkage device are on the same plane; the deflection angle is the angle between the adjustable guide vane's blade surface 102 and the plane).

[0036] As the drive ring 7 slides along the groove on the outer circumferential surface of the casing flange, the drive ball head 8 slides with the drive ring 7. The deflection angle of the adjustable guide vane surface 102 changes with the sliding of the drive ring 7, while the position of the adjustable guide vane 10 remains relatively fixed. Therefore, under the drive of the drive ring 7, relative up-down and left-right sliding occurs between the drive ball head slider 9 and the first orifice 111 of the drive swing arm 11. That is, axial and radial displacements relative to the drive ring 7 occur between the drive ball head slider 9 and the first orifice 111 of the drive swing arm 11. In this embodiment of the invention, the axial and radial displacements relative to the drive ring 7 are absorbed by the ring-like arrangement between the drive swing arm 11 and the drive ball head slider 9, without affecting the deflection angle of the adjustable guide vane surface 102.

[0037] Figure 3 This schematically illustrates a front view (excluding the casing flange and hub flange) of a drive mechanism for driving adjustable guide vanes according to an embodiment of the present invention. See details. Figure 3 In some embodiments of the present invention, the drive mechanism for driving the adjustable guide vane further includes: a casing flange, wherein a drive ring rotation groove 71 is provided on the outer circumferential surface of the flange near the casing mating surface 51, which slides in cooperation with the inner circumferential surface of the drive ring 7, and the drive ring 7 can rotate along the drive ring rotation groove 71 on the outer circumferential surface of the casing flange.

[0038] The casing flange is divided into two parts by the symmetrical centerline of the cross section of the drive ring 7, namely the front casing flange 5 and the rear casing flange 6. Below the drive ring rotation groove 71 on the outer circumferential surface of the casing flange, there are through holes evenly distributed along the circumference, perpendicular to the casing mating surface 51, for inserting bolts to connect the front casing flange 5 and the rear casing flange 6. Downstream of the intake direction J, the rear casing flange 6 has a plurality of radially distributed through holes evenly distributed along the circumference, corresponding one-to-one with the adjustable guide vanes 10. The blade stalks 101 of the adjustable guide vanes are inserted one by one into them, and the adjustable guide vanes 10 rotate around the axis of the blade stalks 101 in the radial through holes.

[0039] The casing flange is annular, and the drive ring 7 can slide along the groove on the outer circumferential surface of the casing flange.

[0040] In this embodiment, the casing flange has good sealing properties. The front casing flange 5 and the rear casing flange 6 are connected by bolts through the through holes below their slots, so that the front casing flange 5 and the rear casing flange 6 can be tightly connected, ensuring good airtightness at the connection. Since the through holes for bolt connection are located on the outer circumferential surface of the casing flange, there are no other features on its inner circumferential surface except for the connection between the front casing flange 5 and the rear casing flange 6, and the through holes on the rear casing flange 6 for fixing the adjustable guide vanes. Therefore, the inner circumferential surface of the casing flange has good airtightness.

[0041] In some embodiments of the present invention, the drive mechanism for driving the adjustable guide vane further includes: a blade root shaft copper seat 14, which has a round hole at its top and is fitted onto the blade root shaft 103 of the adjustable guide vane; a hub flange, located inside the casing flange, whose axis coincides with the axis of the casing flange, and whose outer circumferential surface near the hub mating surface 151 has a plurality of grooves arranged circumferentially, corresponding one-to-one with the adjustable guide vane 10, for fixing the blade root shaft copper seat 14, so that the blade surface 102 of the adjustable guide vane is located between the casing flange and the hub flange. In this embodiment, the blade root shaft copper seat 14 is fitted onto the root of the adjustable guide vane. On one hand, it assists in fixing the adjustable guide vane to the groove of the hub flange; on the other hand, it ensures the sealing of the connection between the adjustable guide vane and the hub flange. Since the drive mechanism driving the adjustable guide vane operates under high pressure, with gas passing through the annular channel between the casing flange and the hub flange, any gas leakage caused by gaps will affect the gas flow field, thus affecting the overall quality of the drive mechanism driving the adjustable guide vane. Therefore, in addition to assisting in fixing the adjustable guide vane to the hub flange, the blade root shaft copper seat 14 must also ensure the sealing of the connection between the adjustable guide vane and the hub flange. When the adjustable guide vane's deflection angle is adjusted, the blade root shaft copper seat 14 remains stationary.

[0042] In some embodiments of the present invention, the hub flange is divided along its hub mating surface 151 into a front hub flange 15 and a rear hub flange 16; a fixing groove for the blade root shaft copper seat 14 is provided on the outer circumferential surface of the rear hub flange 16; below the hub mating surface 151 of the front hub flange 15 and the rear hub flange 16, perpendicular to the hub mating surface 151, through holes distributed circumferentially are provided for inserting bolts to connect the front hub flange 15 and the rear hub flange 16, ensuring good sealing performance of the front hub flange 15 and the rear hub flange 16.

[0043] In some embodiments of the present invention, the drive mechanism for driving the adjustable guide vane further includes: a push-pull rod 1 with a through hole at its end; a push-pull rod pin 2, which cooperates with a nut 3 to connect the end of the push-pull rod 1 to one end of a push-pull rod connecting seat 4, the push-pull rod 1 rotating around the push-pull rod pin 2; and a push-pull rod connecting seat 4, parallel to the plane of the drive ring 7, with one end fixed to the side of the drive ring 7 and the other end located on the radial extension line of the drive ring 7. See details. Figure 4 .

[0044] Figure 4 The illustration schematically shows a side view (excluding the casing flange and hub flange) of a drive mechanism for driving adjustable guide vanes according to an embodiment of the present invention. In this embodiment, the push-pull rod connecting seat 4 and the drive ring 7 are fixed by hexagon socket head cap bolts. By pushing the push-pull rod, the drive ring 7 can be rotated. Under the drive of the drive ring 7, the linkage device transmits the rotation angle to the adjustable guide vane, causing the adjustable guide vane to deflect at a certain angle. The driving force of the push-pull rod 1 comes from linear drive mechanisms such as hydraulic cylinders and worm gear reducers.

[0045] In some embodiments of the present invention, the driving mechanism for driving the adjustable guide vane further includes: a blade shank copper sleeve 12, disposed in the radial through hole of the rear casing flange 6, passing through the radial through hole of the rear casing flange 6, and sleeved on the blade shank 101 of the adjustable guide vane; and a sealing ring 13, disposed at the gap between the adjustable guide vane 10 and the surface of the radial through hole of the rear casing flange, and sleeved in the annular groove of the blade shank 101 of the adjustable guide vane.

[0046] In this embodiment, the blade bushing 12 is used to reduce friction when the adjustable guide vane rotates along the axis of its blade bushing, and the sealing ring 13 is used to seal the connection between the casing flange and the blade bushing 101 of the adjustable guide vane to prevent gas leakage.

[0047] In some embodiments of the present invention, one of the adjustable guide vanes has an angular displacement measuring mechanism mounted on the top of its stalk. The angular displacement measuring mechanism is used to measure the deflection angle of the adjustable guide vane.

[0048] In some embodiments of the present invention, in the initial state, the blade surface 102 of the adjustable guide vane and the corresponding linkage device are on the same plane; the deflection angle of the adjustable guide vane relative to this plane is in the range of ±30°.

[0049] In some embodiments of the present invention, the first opening 111 of the drive swing arm 11 is rectangular and the second opening 112 is square; the part of the adjustable guide vane shank 101 that is fixed by the drive swing arm 11 is square, and the part that passes through the rear casing flange 6 is round. In this embodiment, the adjustable guide vane shank 101 passes through the through hole near the second end face of the casing flange and the second opening 112 of the drive swing arm 11 in sequence and is then fixed with a nut. Since the second opening 112 of the drive swing arm 11 is square and the part of the adjustable guide vane shank 101 that is fixed by the drive swing arm 11 is square, when the adjustable guide vane rotates along the axis of its shank, the drive swing arm 11 will also rotate accordingly. At this time, the casing flange, the blade root shaft copper seat 14, and the hub flange will not rotate accordingly, and the shank copper sleeve 12 fitted on the adjustable guide vane shank can play its role in reducing friction.

[0050] In some embodiments of the present invention, the blade surface 102 of the adjustable guide vane is streamlined. The adjustable guide vane 12 is designed using independently developed parametric modeling software and has a streamlined blade shape. Since the adjustable guide vane is located between the casing flange and the hub flange, when the drive mechanism driving the adjustable guide vane is working, the gas passes through the blade surface 102 of the adjustable guide vane. Setting the blade surface of the adjustable guide vane to be streamlined can reduce the consumption of the gas flow field.

[0051] Those skilled in the art will understand that the features described in the various embodiments and / or claims of the present invention can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in the present invention. In particular, the features described in the various embodiments and / or claims of the present invention can be combined or combined in various ways without departing from the spirit and teachings of the present invention. All such combinations and / or combinations fall within the scope of the present invention.

[0052] Although the invention has been shown and described with reference to specific exemplary embodiments thereof, those skilled in the art will understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. Therefore, the scope of the invention should not be limited to the above embodiments, but should be determined not only by the appended claims but also by their equivalents.

Claims

1. A drive mechanism for driving adjustable vanes, characterized in that include: Drive ring (7), multiple linkage devices and multiple adjustable guide vanes (10) evenly distributed along the circumference. The linkage device is fixed on the drive ring (7) and is used to connect the adjustable guide vane (10). The linkage device and the adjustable guide vane (10) correspond one-to-one. The linkage device includes a drive ball head (8), a drive ball head slider (9), and a drive swing arm (11); the tail of the drive ball head (8) is a threaded cylinder, which is fixed to the outer circumferential surface of the drive ring (7), and the head of the drive ball head (8) is a sphere, with the drive ball head slider (9) and the first hole (111) of the drive swing arm (11) layer by layer around it, and the drive ball head slider (9) slides in the first hole (111); Wherein, the length of the first opening (111) of the driving swing arm (11) is greater than the length of the driving ball head slider (9), and the width of the first opening (111) is equal to the width of the driving ball head slider (9), so that there is a gap between the driving ball head slider (9) and the first opening (111), and the gap is used to eliminate the interference received by the driving ring (7). The second opening (112) of the drive arm (11) is used to fix the stalk (101) of the adjustable guide vane, so that the axis of the stalk (101) of the adjustable guide vane is parallel to the plane of the drive ring (7). The adjustable guide vane (10) rotates around the axis of the stalk (101) of the adjustable guide vane under the drive of the drive ring (7) and the linkage device. The casing flange has a drive ring rotation groove (71) on its outer circumferential surface near the casing mating surface (51), which slides with the inner circumferential surface of the drive ring (7), and the drive ring (7) can rotate along the drive ring rotation groove (71) on the outer circumferential surface of the casing flange. The casing flange is divided into two parts by the symmetrical centerline of the cross section of the drive ring (7), namely the front casing flange (5) and the rear casing flange (6). Below the drive ring rotation groove (71) on the outer circumferential surface of the casing flange, through holes are provided perpendicular to the casing mating surface (51) and evenly distributed along the circumference for inserting bolts to connect the front casing flange (5) and the rear casing flange (6). The rear casing flange (6) is provided with a plurality of radially distributed through holes in the circumferential direction downstream of the air intake direction (J), which correspond one-to-one with the adjustable guide vane (10). The blade stalk (101) of the adjustable guide vane is inserted into each of the holes, and the adjustable guide vane (10) rotates around the axis of the blade stalk (101) in the radial through holes. The push-pull rod (1) has a through hole at its end; The push-pull rod pin (2) cooperates with the nut (3) to connect the end of the push-pull rod (1) to one end of the push-pull rod connecting seat (4), and the push-pull rod (1) rotates around the push-pull rod pin (2); The push-pull rod connecting seat (4) is parallel to the plane of the drive ring (7), with one end fixed to the side of the drive ring (7) and the other end located on the radial extension line of the drive ring (7).

2. A drive mechanism for driving adjustable vanes according to claim 1, characterized in that include: The blade root shaft copper seat (14) has a round hole at its top and is fitted onto the blade root shaft (103) of the adjustable guide vane; The hub flange is located inside the casing flange. Its axis coincides with the axis of the casing flange. Multiple grooves are provided circumferentially on its outer circumferential surface near the hub mating surface (151), corresponding one-to-one with the adjustable guide vane (10), and are used to fix the blade root shaft copper seat (14), so that the blade surface (102) of the adjustable guide vane is located between the casing flange and the hub flange.

3. A drive mechanism for driving adjustable vanes according to claim 2, characterized in that The hub flange is divided along its hub mating surface (151) into a front hub flange (15) and a rear hub flange (16). The fixing groove of the blade root shaft copper seat (14) is provided on the outer circumferential surface of the rear wheel hub flange (16); Below the hub mating surface (151) of the front wheel hub flange (15) and the rear wheel hub flange (16), and perpendicular to the hub mating surface (151), there are through holes distributed in the circumferential direction for inserting bolts to connect the front wheel hub flange (15) and the rear wheel hub flange (16).

4. A drive mechanism for driving adjustable vanes according to claim 1, characterized in that include: A copper sleeve (12) is provided in the radial through hole of the rear casing flange (6), passes through the radial through hole of the rear casing flange (6), and is sleeved on the blade stalk (101) of the adjustable guide vane. A sealing ring (13) is provided at the gap between the adjustable guide vane (10) and the radial through hole surface of the rear casing flange, and is fitted in the annular groove of the blade shank (101) of the adjustable guide vane.

5. A drive mechanism for driving adjustable vanes according to claim 1, characterized in that An angular displacement measuring mechanism is mounted on the top of the stalk (101) of one of the plurality of adjustable guide vanes (10).

6. A drive mechanism for driving adjustable vanes according to claim 1, characterized in that In the initial state, the blade surface (102) of the adjustable guide vane and the corresponding linkage device are on the same plane; The deflection angle of the adjustable guide vane (10) relative to the initial state plane ranges from ±30°.

7. A drive mechanism for driving adjustable vanes according to claim 1, characterized in that The first opening (111) of the drive swing arm (11) is rectangular, and the second opening (112) is square; The blade stalk (101) of the adjustable guide vane is fixed at the point where it is fixed by the drive swing arm (11) with a square handle, and the part that passes through the rear casing flange (6) is a round handle.

8. A drive mechanism for driving adjustable vanes according to claim 1, characterized in that The blade surface (102) of the adjustable guide vane is streamlined.

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