Variable-camber guide vane based on gear drive and its design method

Abstract

The present invention is applicable to the field of turbomachinery, and provides a variable-camber guide vane based on gear drive and its design method. The guide vane includes a front-section blade, a rear-section blade, and a driving member disposed between the front-section blade and the rear-section blade; the driving member is used to drive the front-section blade and the rear-section blade to rotate. By designing a driving gear with a rotation center coinciding with the guide vane adjustment center, two driven gears with different pitch circle radii are respectively designed at the outlet of the front-section blade and the inlet of the rear-section blade to mesh with it. Through different gear transmission ratios, only by adjusting the driving gear, the front and rear sections of the blade can be adjusted according to the established different angle laws. At the same time, gear meshing can maintain good sealing between the two rows of blades, achieving sealing between the two sections of the blade, and maintaining a good sealing effect. At any adjustment angle, the air flow will not leak from the blade basin to the blade back.

Description

Technical Field

[0001] The present invention belongs to the field of turbomachinery, and particularly relates to a variable-camber guide vane based on gear drive and a design method thereof. Background Art

[0002] In order to improve the performance at medium and low speeds, an inlet guide vane (IGV) is commonly used to improve the stability of a compressor. The traditional adjustable guide vane rotates integrally in one piece, and its disadvantage is that obvious separation will occur when the angle changes greatly, as shown in Figure 1 Shown. In order to improve this deficiency, a variable-camber guide vane (VIGV) has emerged. The variable-camber guide vane (VIGV) can be regarded as consisting of two sections of blades, and the front and rear sections can be adjusted independently or only half of them can be adjusted, as shown in Figure 2 Shown. However, a large number of literature materials show that due to a certain gap between the two sections of blades, when the compressor is working, air flow will pass through the gap from the blade basin to the blade back, resulting in an increase in the air flow attack angle of the rear section of the blade, exacerbating the trend of air flow deviation, and further leading to a decrease in the performance of the compressor. Although many researchers have carried out detailed optimizations on the shape, angle, width, etc. of the gap, it is found that as long as there is a gap, it is difficult to prevent air flow leakage. The existing sealing structures for variable-camber guide vanes are relatively rare in the public materials. One that can be found is to use a rubber strip seal between the two sections of blades, as shown in Figure 3 Shown, but there are certain deficiencies in the durability and safety of this method, and during long-term and large-range angle adjustment, due to the repeated extrusion deformation of the rubber strip, the sealing reliability of this method will be greatly reduced.

[0003] In addition, for the variable-camber guide vane with only the rear section adjustable, since there is no turning of the air flow in the front section of the blade and the air flow turns at a large angle in the rear section of the blade channel, when the chord length of the blade is short or the solidity is small, there is also a certain risk of separation. Based on this, researchers have proposed a scheme where both the front and rear halves are adjustable, that is, the front section of the blade is adjusted by a small angle and the rear section of the blade is adjusted by a large angle. As a compromise option, this scheme can keep the front section of the blade well adapted to the incoming flow angle, and the bend angle of the rear section of the blade will not be too large, thus avoiding or reducing the risk of separation. Currently, the existing scheme with both the front and rear sections adjustable is independent adjustment, that is, two sets of independent adjustment mechanisms are required to independently adjust the two sections of blades, which undoubtedly greatly increases the structural complexity and the uncertainty of adjustment. Summary of the Invention

[0004] In view of the above problems, on the one hand, the present invention discloses a variable-camber guide vane based on gear drive, and the guide vane includes:

[0005] The front - segment blade, the rear - segment blade, and a driving member disposed between the front - segment blade and the rear - segment blade;

[0006] The driving member is respectively and cooperatively installed at the contact positions with the front - segment blade and the rear - segment blade, and the driving member is hermetically fitted with the front - segment blade and the rear - segment blade at the contact positions;

[0007] The driving member is used to drive the front - segment blade and the rear - segment blade to rotate.

[0008] Further, the driving member is a driving gear.

[0009] Further, at both ends of the driving gear, a driving - gear tip rotating shaft and a driving - gear root rotating shaft are respectively installed, and the driving gear rotates around the driving - gear tip rotating shaft and the driving - gear root rotating shaft.

[0010] Further, at one end of the front - segment blade in contact with the driving gear, a front - segment - blade driven gear meshing with the driving gear is provided.

[0011] Further, at both ends of the front - segment - blade driven gear, a front - segment - blade tip rotating shaft and a front - segment - blade root rotating shaft are respectively installed, and the front - segment - blade driven gear rotates around the front - segment - blade tip rotating shaft and the front - segment - blade root rotating shaft.

[0012] Further, at one end of the rear - segment blade in contact with the driving gear, a rear - segment - blade driven gear meshing with the driving gear is provided.

[0013] Further, at both ends of the rear - segment - blade driven gear, a rear - segment - blade tip rotating shaft and a rear - segment - blade root rotating shaft are respectively installed, and the rear - segment - blade driven gear rotates around the rear - segment - blade tip rotating shaft and the rear - segment - blade root rotating shaft.

[0014] On the other hand, the present invention also discloses a design method for a variable - camber guide vane based on gear transmission, and the design method includes:

[0015] Segment the complete guide vane, determine the demarcation line between the front - segment blade and the rear - segment blade, and the respective rotation centers of the two segments of blades;

[0016] According to the expected adjustment angle, determine the sizes of the front - segment blade, the rear - segment blade, and the driving member.

[0017] Further, before segmenting the complete guide vane, determining the demarcation line between the front - segment blade and the rear - segment blade, and the respective rotation centers of the two segments of blades, the design method further includes:

[0018] According to the design requirements, determine the geometric parameters of the blade profile, perform blade design, and obtain the un - separated complete guide vane.

[0019] Further, determining the sizes of the front-stage blades, rear-stage blades, and drive member according to the expected adjustment angle specifically includes:

[0020] According to the angle adjustment ratio of the designed front-stage blade adjustment angle β1 and rear-stage blade adjustment angle β2: i = β2 / β1, determine the pitch circle radius R of the front-stage blade driven gear f and the pitch circle radius R of the rear-stage blade driven gear l The pitch circle radius ratio between them: R l / R f = 1 / i = β1 / β2;

[0021] Predesignate the pitch circle radius R of the driving gear m and the pitch circle radius of any one of the driven gears;

[0022] According to the pitch circle radius ratio, the pitch circle radius R of the driving gear m and the pitch circle radius of any one of the driven gears, obtain the pitch circle radius of the other driven gear;

[0023] According to the pitch circle radius R of the driving gear m the pitch circle radii of the two driven gears, and the pitch circle radius ratio, design the corresponding gears.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] A variable-camber guide vane based on gear transmission and its design method provided by the present invention, by designing a driving gear with a rotation center coinciding with the guide vane adjustment center, and respectively designing two driven gears with different pitch circle radii at the outlet of the front-stage blades and the inlet of the rear-stage blades to mesh with it. Through different gear transmission ratios, only by adjusting the driving gear, the front and rear stages of blades can be adjusted according to the established different angle rules. At the same time, gear meshing can maintain good sealing between the two rows of blades, achieving sealing between the two stages of blades, and can maintain a good sealing effect. At any adjustment angle, the air flow will not leak from the blade basin to the blade back.

[0026] Other features and advantages of the present invention will be described in the following specification, and part of them will become obvious from the specification, or be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures pointed out in the specification, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 It is a schematic diagram of the rotation of a conventional guide vane;

[0029] Figure 2 It is a schematic diagram of the rotation of a variable-camber guide vane;

[0030] Figure 3 It is a top view of a variable-camber guide vane sealed with a rubber strip;

[0031] Figure 4 It is a top view of the variable-camber guide vane of the present invention based on gear transmission;

[0032] Figure 5 It is Figure 4 an enlarged view of part A in

[0033] Figure 6 It is a side view of the integral ring of the variable-camber guide vane of the present invention based on gear transmission;

[0034] Figure 7 It is Figure 6 an enlarged view of part B in

[0035] Figure 8 It is Figure 6 an enlarged view of part C in

[0036] In the figure, 1 - front-section blade; 2 - rear-section blade; 3 - driving gear; 4 - driven gear of the front-section blade; 5 - driven gear of the rear-section blade; 6 - pitch circle radius R of the driven gear of the front-section blade f ; 7 - pitch circle radius R of the driven gear of the rear-section blade l ; 8 - pitch circle radius R of the driving gear m ; 9 - tip rotation axis of the front-section blade; 10 - tip rotation axis of the rear-section blade; 11 - tip rotation axis of the driving gear; 12 - root rotation axis of the front-section blade; 13 - root rotation axis of the rear-section blade; 14 - root rotation axis of the driving gear. Detailed implementation manners

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0038] In one embodiment of the present invention, as Figure 4 and Figure 5 shown, a variable-camber guide vane based on gear transmission includes a front-section vane 1, a rear-section vane 2, and a driving member disposed between the front-section vane 1 and the rear-section vane 2; the driving member is a driving gear 3.

[0039] The driving member is respectively installed in cooperation at the contact positions with the front-section vane 1 and the rear-section vane 2, and the driving member is hermetically fitted with the front-section vane 1 and the rear-section vane 2 at the contact positions; the driving member is used to drive the front-section vane 1 and the rear-section vane 2 to rotate.

[0040] One end of the front-section vane 1 in contact with the driving gear 3 is provided with a front-section vane driven gear 4 meshing with the driving gear 3. One end of the rear-section vane 2 in contact with the driving gear 3 is provided with a rear-section vane driven gear 5 meshing with the driving gear 3. It should be noted that, in order to maintain the stability and tightness of the guide vane adjustment, the lengths of the driving gear 3, the front-section vane driven gear 4, and the rear-section vane driven gear 5 are preferably equal to the height from the root to the tip of the guide vane at their respective positions.

[0041] As Figures 6 - 8 shown, both ends of the driving gear 3 are respectively installed with a driving gear tip rotating shaft 11 and a driving gear root rotating shaft 14, and the driving gear 3 rotates around the driving gear tip rotating shaft 11 and the driving gear root rotating shaft 14. Both ends of the front-section vane driven gear 4 are respectively installed with a front-section vane tip rotating shaft 9 and a front-section vane root rotating shaft 12, and the front-section vane driven gear 4 rotates around the front-section vane tip rotating shaft 9 and the front-section vane root rotating shaft 12. Both ends of the rear-section vane driven gear 5 are respectively installed with a rear-section vane tip rotating shaft 10 and a rear-section vane root rotating shaft 13, and the rear-section vane driven gear 5 rotates around the rear-section vane tip rotating shaft 10 and the rear-section vane root rotating shaft 13. The driving gear tip rotating shaft 11 or the driving gear root rotating shaft 14 is connected to a driving source.

[0042] Taking the example as Figure 6 shown, a plurality of the above variable-camber guide vanes are arranged according to the usage requirements. Different guide vanes can have the same or different cambers, and can flexibly guide the fluid passing through the guide vanes to flow in the expected direction.

[0043] Taking Figure 4 as an example, the camber adjustment process of the variable-camber guide vane is as follows:

[0044] Control the rotation of the driving gear 3. During the rotation process, the driving gear 3 meshes with the front-section vane driven gear 4 and the rear-section vane driven gear 5. Therefore, the front-section vane 1 and the rear-section vane 2 rotate accordingly, and the rotation directions of the two sections of vanes are opposite, achieving the purpose of changing the camber of the guide vane. In addition, since the transmission ratios between the driving gear 3 and the front-section vane driven gear 4 and the rear-section vane driven gear 5 can be designed to be different, the rotation angles of the front-section vane driven gear 4 and the rear-section vane driven gear 5 can be controlled by controlling the transmission ratio, so that the front-section vane driven gear 4 and the rear-section vane driven gear 5 can not only be adjusted synchronously but also rotate different angles. Moreover, since the driving gear 3 meshes with the front-section vane driven gear 4 and the rear-section vane driven gear 5, at the meshing position of the driving and driven gears, the tooth surfaces of the two gears are closely attached, realizing mechanical hard sealing. During the process of the guide vane guiding the flow, the air flow will not flow from the blade basin to the blade back through the mating and assembling part, preventing the leakage of the air flow, and the mechanical hard sealing has a long service life and is not easily damaged.

[0045] The design method of the above variable-camber guide vane includes the following steps:

[0046] Step 1: According to the design requirements, determine the geometric parameters of the blade profile, conduct blade design, and obtain a complete undivided guide vane.

[0047] Step 2: Segment the complete guide vane, determine the dividing line between the front-section vane 1 and the rear-section vane 2, and the respective rotation centers of the two sections of vanes.

[0048] Step 3: According to the expected adjustment angle, determine the sizes of the front-section vane 1, the rear-section vane 2, and the driving member.

[0049] In an embodiment of the present invention, Step 3: According to the expected adjustment angle, determining the sizes of the front-section vane, the rear-section vane, and the driving member specifically includes:

[0050] Step 31: According to the angle adjustment ratio of the designed front-section vane adjustment angle β1 and the rear-section vane adjustment angle β2: i = β2 / β1, determine the pitch circle radius R f (6) of the front-section vane driven gear and the pitch circle radius R l (7) of the rear-section vane driven gear, and the pitch circle radius ratio between them: R l / R f = 1 / i = β1 / β2;

[0051] Step 32: Predesignate the pitch circle radius R m(8) and the pitch circle radius of any one of the driven gears; it should be noted that the determination of the pitch circle radii of the driving gear and any driven gear needs to be determined by considering geometric constraints such as the limit rotation angle, the shape of the guide vane profile in this area, and non-interference between the guide vane and the driving gear during the adjustment rotation.

[0052] Step 33: According to the pitch circle radius ratio and the pitch circle radius R of the driving gear m (8) and the pitch circle radius of any one of the driven gears, obtain the pitch circle radius of the other driven gear;

[0053] Step 34: According to the pitch circle radius R of the driving gear m (8), the pitch circle radii of the two driven gears, and the pitch circle radius ratio (i.e., the transmission ratio between the gears), design the corresponding gears.

[0054] The variable-camber guide vane mentioned above designs a driving gear 3 with the rotation center coinciding with the guide vane adjustment center, designs two driven gears with different pitch circle radii to mesh with the driving gear 3 at the outlet of the front-section blade and the inlet of the rear-section blade respectively, and selects an appropriate transmission ratio. Only by adjusting the driving gear, the front and rear-section blades can achieve angle adjustment according to their respective transmission ratios. At the same time, the gear meshing can maintain good sealing between the two rows of blades.

[0055] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A variable-camber guide vane based on gear drive, characterized in that, The guide vane includes: a front-section blade (1), a rear-section blade (2), and a driving member disposed between the front-section blade (1) and the rear-section blade (2); the driving member is respectively installed in cooperation at the contact positions with the front-section blade (1) and the rear-section blade (2), and the driving member is hermetically fitted with the front-section blade (1) and the rear-section blade (2) at the contact positions; the driving member is used to drive the front-section blade (1) and the rear-section blade (2) to rotate; the driving member is a driving gear (3); a front-section blade driven gear (4) meshing with the driving gear (3) is disposed at one end of the front-section blade (1) in contact with the driving gear (3); a rear-section blade driven gear (5) meshing with the driving gear (3) is disposed at one end of the rear-section blade (2) in contact with the driving gear (3); a plurality of the variable-camber guide vanes are arranged, and different variable-camber guide vanes have different cambers, and are used to guide the fluid passing through the variable-camber guide vanes to flow in the expected direction.

2. The variable-camber guide vane based on gear drive according to claim 1, wherein A driving gear tip rotating shaft (11) and a driving gear root rotating shaft (14) are respectively installed at two ends of the driving gear (3), and the driving gear (3) rotates around the driving gear tip rotating shaft (11) and the driving gear root rotating shaft (14).

3. The variable-camber guide vane based on gear drive according to claim 1, wherein A front-section blade tip rotating shaft (9) and a front-section blade root rotating shaft (12) are respectively installed at two ends of the front-section blade driven gear (4), and the front-section blade driven gear (4) rotates around the front-section blade tip rotating shaft (9) and the front-section blade root rotating shaft (12).

4. The variable-camber guide vane based on gear drive according to claim 1, wherein, A rear-section blade tip rotating shaft (10) and a rear-section blade root rotating shaft (13) are respectively installed at two ends of the rear-section blade driven gear (5), and the rear-section blade driven gear (5) rotates around the rear-section blade tip rotating shaft (10) and the rear-section blade root rotating shaft (13).

5. A design method for a variable-camber guide vane based on gear drive according to any one of claims 1-4, characterized in that, The design method includes: segmenting the complete guide vane, determining the demarcation line between the front-section blade (1) and the rear-section blade (2), and the respective rotation centers of the two sections of blades; determining the sizes of the front-section blade (1), the rear-section blade (2), and the driving member according to the expected adjustment angle.

6. The design method of the variable-camber guide vane based on gear drive according to claim 5, characterized in that, Before segmenting the complete guide vane, determining the demarcation line between the front-section blade (1) and the rear-section blade (2), and the respective rotation centers of the two sections of blades, the design method further includes: determining the geometric parameters of the blade profile according to the design requirements, performing blade design, and obtaining the undivided complete guide vane.

7. The design method of the variable-camber guide vane based on gear drive according to claim 5, characterized in that, The determining the sizes of the front-section blade (1), the rear-section blade (2), and the driving member according to the expected adjustment angle specifically includes: According to the angle adjustment ratio of the front blade adjustment angle β1 and the rear blade adjustment angle β2 designed: i = β2 / β1, determine the pitch circle radius R of the front blade driven gear f (6) and the pitch circle radius R of the rear blade driven gear l (7) between the pitch circle radius ratio: R l / R f = 1 / i = β1 / β2; Preset the pitch circle radius R of the driving gear m (8)and the pitch circle radius of any one of the driven gears; According to the ratio of the pitch circle radii and the pitch circle radius R of the driving gear m (8)and the pitch circle radius of any one of the driven gears, the pitch circle radius of the other driven gear is obtained; According to the pitch circle radius R of the driving gear m (8)Design corresponding gears based on the pitch circle radii and the pitch circle radius ratio of the two driven gears.

Images