CN115978001A - Petiole connection structure of large-scale wind-tunnel blade - Google Patents
Petiole connection structure of large-scale wind-tunnel blade Download PDFInfo
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- CN115978001A CN115978001A CN202310034854.0A CN202310034854A CN115978001A CN 115978001 A CN115978001 A CN 115978001A CN 202310034854 A CN202310034854 A CN 202310034854A CN 115978001 A CN115978001 A CN 115978001A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The invention discloses a petiole connecting structure of a large wind tunnel blade, which comprises a petiole connected with the blade and a joint, wherein the petiole is provided with a sleeving space with an opening at an inner connecting end, the joint comprises a sleeving section and a fixing section, the sleeving section is positioned in the sleeving space of the petiole, the fixing section extends out of the opening of the sleeving end of the petiole through the sleeving space, and a clamping structure for preventing the sleeving section from axially moving in the sleeving space is arranged between the sleeving section and the inner wall of the sleeving space of the petiole. The petiole and the blade are longitudinally split and buckled into two sections. The advantages are that: the joint and the blade shank can be firmly clamped together, the outer layer is tightly wound by carbon fiber prepreg, and the blade shank can be prevented from being thrown off from the joint in a high-speed rotation state of the blade; the material consumption of the whole wind tunnel fan can be greatly reduced, and the weight of the whole wind tunnel fan can be reduced; the blade can be prevented from twisting in a high-speed rotation state of the blade and stepless adjustment of the blade angle can be realized.
Description
Technical Field
The invention relates to a petiole connecting structure of a large wind tunnel blade, belonging to the technical field of wind tunnel equipment.
Background
Due to the large size of the large-scale wind tunnel blade, the composite material blade is required to be light in weight and high in rigidity, and at present, a structure of a carbon beam, foam and a skin is usually adopted. The structure is mature in process and stable in performance, but the whole weight is large due to the fact that the foam is filled in the blade body, and especially when the length of the blade body is larger than 2m, the weight of the blade has a large influence on the economy of the fan. The hub is often required to be larger for large wind tunnel blades, so that two connecting positions are usually designed for the blade handle and the hub, the blade handle is fixedly connected with the inner ring of the hub, and the outer ring of the hub plays a role in supporting the blade handle. The blade handle of the large-size long blade is a problem to be solved urgently in the prior art by designing a blade handle structure, realizing the reliability of the connection between the blade handle and the metal hub, resisting the torsional deformation of the blade and preventing the blade from being thrown off under the working condition of high-speed rotation.
The invention patent with the publication number of CN 113530886A and the name of a large wind tunnel fan blade describes a large wind tunnel fan impeller, and mainly introduces a large wind tunnel fan impeller structure which comprises an inner ring layer with a metal structure and an outer ring layer with a composite material, wherein the blade is an integral structure blade and comprises a blade body, a blade handle and a metal foot. The blade handle is connected with an inner ring mounting hole I and an outer ring mounting hole II of the metal hub, the inner hole I is connected with the expansion sleeve through a bolt, the outer hole II only plays a supporting role, and the composite material ring layer does not play a supporting and fixing role on the blade handle. According to the technical scheme, the connecting structure between the metal foot and the composite material petiole is unreasonable, the metal foot wraps the composite material petiole, the hole in the composite material petiole is connected with the metal foot through the bolt, and the problem that the hole in the composite material petiole is cracked under the action of centrifugal force is easily caused. And the expansion sleeve is arranged on the outer side of the connecting nut, and the connecting nut is positioned in a narrow space, so that the nut is inconvenient to screw.
The invention patent with publication number CN 115163552A entitled carbon fiber blade root connection structure describes a carbon fiber blade root connection structure. The fan hub also comprises an inner ring and an outer ring, wherein the inner ring is connected to fix the blade handle, and the outer ring is connected to support the blade handle. Through at the inside pre-buried metal dabber of carbon fiber petiole, be provided with first annular and second annular on combined material petiole face of cylinder, the design has the blade root locking open-loop of a metal, interior surface design has with first annular and second annular complex flange, the anterior segment of locking open-loop offsets with the wheel hub inner circle, the whole cover of locking is on the locking open-loop, it is fixed with metal dabber connection with a screw to lock the whole ring, screw up connecting screw, make the whole ring of locking hold tightly to the locking open-loop gradually, both are the conical surface cooperation, play the effect of fixed blade root. The connecting structure is characterized in that a locking whole ring and a locking open ring are tightly extruded through a screw, then a blade handle is stretched to be in tight contact with a hub, and the distance between a blade and the hub is adjusted through an elastic gasket. The carbon fiber structure of the blade root with the structure of the scheme is complex, and the carbon fiber structure comprises two conical surface ring grooves, a winding layer, an open-lock whole ring, a lock open ring, a limit groove, an anti-twist block and other structures, and the whole process is complex. The composite blade stems are in close fit contact with the steel hub, so that the composite blade stems are easily abraded, and the blades are easily deformed due to abnormal torsion after long-term operation. The blade body and the composite material petiole are of solid structures, so that the whole weight is large, the requirement on a hub is high, and the energy consumption is high.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to design the petiole structure, realize the reliability that petiole and metal joint are connected, prevent that the blade from getting rid of under big moment of torsion, high rotational speed operating mode and taking off.
Aiming at the problems, the technical scheme provided by the invention is as follows:
the utility model provides a petiole connection structure of large-scale wind-tunnel blade, includes the petiole of being connected with the blade, still includes the joint, the petiole has the opening in the space of cup jointing of inscription end, connect including cup jointing section and canned section, the cup jointing section is located the space of cup jointing of petiole, the canned section is located outside the petiole inner joint end, it prevents to cup joint the block structure of section at cup jointing space axial float to have between the inner wall in the space of cup jointing of bell jointing section and petiole.
Further, the method comprises the following steps of; the petiole and the blade are longitudinally split and buckled into two sections.
Further, the method comprises the following steps of; the clamping structure is as follows: the cup jointing space of the petiole is a conical cup jointing space, one end of the conical cup jointing space with the larger diameter faces the external connection end of the petiole, the other end of the conical cup jointing space with the smaller diameter faces the internal connection end of the petiole, and the cup jointing section of the joint in the conical cup jointing space is a conical cup jointing section with the same taper and diameter as the conical cup jointing space.
Further, the step of; the clamping structure is as follows: the inner wall of the conical sleeving space of the petiole is provided with an annular groove, and the periphery of the conical sleeving section is provided with an annular flange matched with the annular groove.
Further, the method comprises the following steps of; the clamping structure is as follows: the sleeving space of the petiole is a cylindrical sleeving space, and the sleeving section of the joint in the cylindrical sleeving space is a cylindrical sleeving section with the diameter equal to that of the cylindrical sleeving space; the inner wall of the cylindrical sleeving space is provided with an annular groove, and the periphery of the cylindrical sleeving section is provided with an annular flange matched with the annular groove.
Further, the method comprises the following steps of; the clamping structure is as follows: the sleeving space of the petiole comprises a cylindrical sleeving space and a conical sleeving space, and the sleeving section of the joint in the sleeving space is a cylindrical sleeving section and a conical sleeving section which respectively correspond to the cylindrical sleeving space and the conical sleeving space; the inner wall of the cylindrical sleeving space is provided with an annular groove, and the periphery of the cylindrical sleeving section is provided with an annular flange matched with the annular groove.
Further, the method comprises the following steps of; the two-petal buckling molding of the petioles and the blades is to wind the peripheries of the two-petal buckling petioles and the blades by a carbon fiber gumming tape to form a solidified winding layer.
Further, the method comprises the following steps of; the joint is made of a metal material, and the blade shank are made of a high-modulus carbon fiber material.
Further, the step of; the fixed section that connects includes axial fastening section and radial fastening section, radial fastening section is close to the section of cup jointing, radial fastening section diameter is greater than axial fastening section diameter, makes radial fastening section form annular pressure solid face in the junction with axial fastening section, axial fastening section periphery has the external screw thread.
Further, the method comprises the following steps of; the periphery of the radial fastening section is sleeved with a radial expansion sleeve, the expansion sleeve comprises an inner sleeve, an outer sleeve and an expansion bolt, an expansion hole is formed between the inner sleeve and the outer sleeve, and the expansion bolt is screwed into the expansion hole to expand the distance between the inner sleeve and the outer sleeve.
Has the advantages that:
1. the joint and the blade shank can be firmly clamped together, and the joint can be prevented from being thrown off from the blade shank in a high-speed rotating state of the blade;
2. the joint, the blade handle and the blade are made of different materials, so that the joint can be made of metal materials with enough strength, the blade handle and the blade can be made of light carbon fiber materials and are designed to be hollow, and the material consumption of the whole wind tunnel fan can be greatly reduced and the weight of the whole wind tunnel fan can be lightened;
3. the blade can be prevented from twisting in a high-speed rotation state of the blade and stepless adjustment of the angle of the blade can be realized.
Drawings
FIG. 1 is a perspective view of a blade shank of a blade of the present application mounted on a hub;
FIG. 2 is a perspective view of the two-lobe design of the blade of the present application prior to buckling;
FIG. 3 is a schematic cross-sectional view of the blade shank of the present application fixedly mounted to the inner race of the hub by a joint;
FIG. 4 is a cross-sectional view of the joint and inner race of the present application prior to installation;
FIG. 5 is a schematic cross-sectional view of the connection structure of the blade handle according to the first embodiment of the present application;
FIG. 6 is a schematic cross-sectional view of the connection structure of the petiole according to the second embodiment of the present application;
FIG. 7 is a schematic cross-sectional view of the structure of the petiole according to the third embodiment of the present application;
FIG. 8 is a schematic cross-sectional view of a blade stem and joint structure according to the fourth embodiment of the present application;
fig. 9 is a sectional view illustrating the fourth embodiment of the present application in which the relationship between the petioles and the joint structures is separated.
In the figure: 1. a blade; 2. a petiole; 201. sleeving a space; 2011. a conical sleeving space; 2012. a cylindrical sleeving space; 202. an annular groove; 203. a winding layer; 3. a joint; 301. a sleeving section; 3011. a conical sleeving section; 3012. a cylindrical sleeving section; 302. a fixed section; 3021. a radial fastening section; 3022. an axial fastening section; 3023. annular pressing and fixing surface; 303. an annular flange; 4. expanding and tightening the sleeve; 401. an inner sleeve; 402. a jacket; 403. expanding and pressing the hole; 404. expanding the bolt; 5. an inner ring; 501. mounting holes; 5011. radial expansion pressing holes; 5012. axially tensioning the bore; 5013. an annular pressing and fixing table; 6. and a nut.
Detailed Description
The invention is further described with reference to the following examples and figures:
example one
As shown in fig. 1 to 5, a blade shank connection structure of a large wind tunnel blade includes a blade shank 2 connected to a blade 1, and further includes a joint 3, the blade shank 2 has a socket space 201 opened at an inner end, the joint 3 includes a socket section 301 and a fixing section 302, the socket section 301 is located in the socket space 201 of the blade shank 2, and the fixing section 302 is located outside the inner end of the blade shank 2. A snap-fit structure for preventing axial movement of the coupling section 301 in the coupling space 201 is provided between the coupling section 301 and the inner wall of the coupling space 201 of the blade shank 2. The one end that petiole 2 is connected with blade 1 is the outer termination end of petiole 2, and outer round at the wheel hub is installed to the outer termination end. The other end of the petiole 2 is an inner connection end of the petiole, and a fixing section 302 of the joint 3 positioned outside the inner connection end is fixedly installed on an inner ring 5 of the hub. The arrangement of the clamping structure ensures that the joint 3 can not be separated from the sleeving space 201 when the blade stem of the blade rotates at a high speed, and the blade stem of the blade can be firmly fixed on the hub.
Preferably, the joint 3 is made of a metal material, such as steel or an alloy material, to ensure the strength of the joint 3. In order to reduce weight and ensure sufficient strength, the blades 1 and the shanks 2 are made of high modulus carbon fibre material and both are hollow structures, of course, at least within the hollow blades the necessary supporting or filling structures.
In order to facilitate the manufacture of the hollow structure blade and the assembly of the petiole 2 of the sleeved joint 3, the petiole 2 and the blade 1 are preferably in a longitudinal two-lobe buckling type.
The two-lobe buckling molding of the petiole 2 and the blade 1 is to wind the outer peripheries of the two-lobe buckling petiole 2 and the blade 1 by a carbon fiber dip tape to form a solidified winding layer 203.
The fixing section 302 of the joint 3 comprises an axial fastening section 3022 and a radial fastening section 3021, the radial fastening section 3021 is close to the socket section 301, the diameter of the radial fastening section 3021 is larger than that of the axial fastening section 3022, so that an annular pressing and fixing surface 3023 is formed at the joint of the radial fastening section 3021 and the axial fastening section 3022, and the outer periphery of the axial fastening section 3022 is provided with an external thread. The periphery of the radial fastening section 3021 is sleeved with a radial expansion sleeve 4, the expansion sleeve 4 includes an inner sleeve 401, an outer sleeve 402 and an expansion bolt 404, an expansion hole 403 is formed between the inner sleeve 401 and the outer sleeve 402, and the expansion bolt 404 is screwed into the expansion hole 403 to expand the distance between the inner sleeve 401 and the outer sleeve 402. In application, the hub inner ring 5 is provided with the communicated mounting holes 501, the mounting holes 501 comprise radial expansion holes 5011 and axial tensioning holes 5012, the diameter of the radial expansion holes 5011 is larger than that of the axial tensioning holes 5012, and an annular pressing platform 5013 is formed between the radial expansion holes 5011 and the axial tensioning holes 5012. When the blade is installed, the axial fastening section 3022 penetrates through the axial fastening hole 5012, the radial fastening section 3021 is located in the radial expansion hole 5011, the inner sleeve 401 of the expansion sleeve 4 is sleeved on the radial fastening section 3021, the outer periphery of the outer sleeve 402 is attached to and pressed against the inner wall of the radial expansion hole 5011, the nut 6 is screwed in the axial fastening section 3022 through external threads, the annular pressing surface 3023 of the joint is tightly pressed on the annular pressing table 5013 of the installation hole 501 of the inner ring 5, the nut 6 is tightly pressed on the inner side of the inner ring 5, the joint 3 is axially tightened and fixed on the inner ring 5, then the expansion bolt 404 is screwed into the pressure hole 403, the distance between the inner sleeve 401 and the outer sleeve 402 is increased, the joint 3 is radially pressed in the radial expansion hole 5011 of the inner ring, the torsion of the joint 3 is prevented, namely, the torsion of the blade handle of the whole blade is prevented, and the angle of the blade can be conveniently adjusted by screwing out the expansion bolt 404.
Alternatively, the engaging structure of the present embodiment is: the space 201 that cup joints of petiole 2 is toper and cup joints space 2011, and the one end that toper cup joints space 2011 diameter is big is towards the external connection end of petiole 2, and the one end that the diameter is little is towards the internal connection end of petiole 2, and the section 301 that cup joints that connects 3 to be located toper and cup joints space 2011 is the toper that the tapering, the diameter of toper all equal cup joints section 3011 with toper cup joints space 2011.
During assembly, the petiole 2 and the blade 1 which are longitudinally divided into two parts buckle the sleeving section 301 of the joint 3 in the conical sleeving space 2011, and then the carbon fiber gummed tape is wound on the petiole 2 and the blade 1 to form a solidified winding layer 203. For the sake of firmness, there is glue between the outer circumference of the socket section 301 of the joint 3 and the inner wall of the conical socket space 2011.
Example two
As shown in fig. 6, the difference from the first embodiment is that the engaging structure is: the conical sleeve space 2011 of the blade 2 has an annular groove 202 on the inner wall, and the conical sleeve section 3011 has an annular flange 303 on the outer periphery to match the annular groove 202. In use, the tapered socket section 3011 of the connector 3 is located in the tapered socket 2011 of the petiole and the annular flange 303 is located in the annular recess 202.
EXAMPLE III
As shown in fig. 7, the difference from the above embodiment is that the engaging structure is: the socket space 201 of the blade stem 2 is a cylindrical socket space 2012, and the socket section 301 of the joint 3 in the cylindrical socket space 2012 is a cylindrical socket section 3012 with the diameter equal to that of the cylindrical socket space 2012; the inner wall of cylindrical socket space 2012 has an annular groove 202 and the outer periphery of cylindrical socket section 3012 has an annular flange 303 that mates with annular groove 202. In use, the cylindrical socket section 3012 of the joint 3 is located in the cylindrical socket space 2012 of the petiole, and the annular flange 303 is located in the annular groove 202.
Example four
As shown in fig. 8 and 9, the difference from the above embodiment is that the engaging structure is: the socket space 201 of the petiole 2 comprises a cylindrical socket space 2012 and a conical socket space 2011, and the socket section 301 of the joint 3 in the socket space 201 is a cylindrical socket section 3012 and a conical socket section 3011 respectively corresponding to the cylindrical socket space 2012 and the conical socket space 2011; the inner wall of cylindrical socket space 2012 has an annular groove 202 and the outer periphery of cylindrical socket section 3012 has an annular flange 303 that mates with annular groove 202. When the taper sleeve joint is used, the cylindrical sleeve joint section 3012 of the joint 3 is located in the cylindrical sleeve joint space 2012 of the petiole, the annular flange 303 is located in the annular groove 202, and the taper sleeve joint section 3011 of the joint 3 is located in the taper sleeve joint space 2011 of the petiole.
The above-described embodiments are intended only to illustrate the present invention more clearly and should not be construed as limiting the scope of the invention covered thereby, and any modification of the equivalent form should be construed as falling within the scope of the invention covered thereby.
Claims (10)
1. The utility model provides a petiole connection structure of large-scale wind-tunnel blade, includes petiole (2) of being connected with blade (1), its characterized in that: still include joint (3), petiole (2) have opening in the space (201) that cup joints of inscription end, connect (3) including cup jointing section (301) and canned paragraph (302), cup joint section (301) are located the space (201) that cup joints of petiole (2), canned paragraph (302) are located petiole (2) inscription end outside, it prevents to cup joint section (301) and has the block structure of preventing to cup joint section (301) at the space (201) axial float of cup jointing to cup joint between the inner wall of the space (201) of cup jointing of petiole (2).
2. The blade shank connecting structure of a large wind tunnel blade according to claim 1, wherein: the petiole (2) and the blade (1) are in longitudinal two-petal buckling molding.
3. The blade shank connecting structure of a large wind tunnel blade according to claim 2, wherein the engaging structure is: space (201) cup joint of petiole (2) is for the toper space (2011) of cup jointing, and the one end that the toper cup jointed space (2011) diameter is big is towards the external end of petiole (2), and the one end that the diameter is little is towards the inscription end of petiole (2), and section (301) cup joints that joint (3) are located toper and cup joint space (2011) are for cup joint section (3011) with the toper that tapering, diameter homogeneous phase of toper cup joint space (2011) equals.
4. The blade shank connecting structure of a large wind tunnel blade according to claim 3, wherein the engaging structure is: the inner wall of the conical sleeving space (2011) of the petiole (2) is provided with an annular groove (202), and the periphery of the conical sleeving section (3011) is provided with an annular flange (303) matched with the annular groove (202).
5. The blade shank connecting structure of a large wind tunnel blade according to claim 2, wherein the engaging structure is: the sleeving space (201) of the petiole (2) is a cylindrical sleeving space (2012), and the sleeving section (301) of the joint (3) in the cylindrical sleeving space (2012) is a cylindrical sleeving section (3012) with the diameter equal to that of the cylindrical sleeving space (2012); the inner wall of the cylindrical socket space (2012) is provided with an annular groove (202), and the periphery of the cylindrical socket section (3012) is provided with an annular flange (303) matched with the annular groove (202).
6. The blade shank connecting structure of a large wind tunnel blade according to claim 2, wherein the engaging structure is: the sleeving space (201) of the petiole (2) comprises a cylindrical sleeving space (2012) and a conical sleeving space (2011), and the sleeving section (301) of the joint (3) in the sleeving space (201) is a cylindrical sleeving section (3012) and a conical sleeving section (3011) which respectively correspond to the cylindrical sleeving space (2012) and the conical sleeving space (2011); the inner wall of the cylindrical socket space (2012) is provided with an annular groove (202), and the periphery of the cylindrical socket section (3012) is provided with an annular flange (303) matched with the annular groove (202).
7. The blade shank connecting structure of the large wind tunnel blade according to any one of claims 2 to 6, wherein the two-petal buckling molding of the blade shank (2) and the blade (1) is to wind the two-petal buckling blade shank (2) and the blade (1) with a carbon fiber dip tape at the periphery to form a solidified winding layer (203).
8. A blade shank connection structure for a large wind tunnel blade according to any one of claims 1 to 6, characterised in that the joint (3) is made of a metal material and the blade (1) and the blade shank (2) are made of a high modulus carbon fibre material.
9. The blade shank connecting structure of the large wind tunnel blade according to any one of claims 2 to 6, wherein the fixing section (302) of the joint (3) comprises an axial fastening section (3022) and a radial fastening section (3021), the radial fastening section (3021) is close to the socket joint section (301), the diameter of the radial fastening section (3021) is larger than that of the axial fastening section (3022), so that the radial fastening section (3021) forms an annular pressing and fixing surface (3023) at the connection position with the axial fastening section (3022), and the periphery of the axial fastening section (3022) is provided with external threads.
10. The blade shank connecting structure of the large wind tunnel blade according to claim 9, wherein a radial expansion sleeve (4) is sleeved on the outer periphery of the radial fastening section (3021), the expansion sleeve (4) comprises an inner sleeve (401), an outer sleeve (402) and an expansion bolt (404), an expansion hole (403) is formed between the inner sleeve (401) and the outer sleeve (402), and the distance between the inner sleeve (401) and the outer sleeve (402) can be enlarged when the expansion bolt (404) is screwed into the expansion hole (403).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310034854.0A CN115978001A (en) | 2023-01-10 | 2023-01-10 | Petiole connection structure of large-scale wind-tunnel blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310034854.0A CN115978001A (en) | 2023-01-10 | 2023-01-10 | Petiole connection structure of large-scale wind-tunnel blade |
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| Publication Number | Publication Date |
|---|---|
| CN115978001A true CN115978001A (en) | 2023-04-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310034854.0A Pending CN115978001A (en) | 2023-01-10 | 2023-01-10 | Petiole connection structure of large-scale wind-tunnel blade |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116576152A (en) * | 2023-07-12 | 2023-08-11 | 中国空气动力研究与发展中心低速空气动力研究所 | Wind tunnel fan blade fixing device and wind tunnel fan with adjustable blade mounting angle |
-
2023
- 2023-01-10 CN CN202310034854.0A patent/CN115978001A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116576152A (en) * | 2023-07-12 | 2023-08-11 | 中国空气动力研究与发展中心低速空气动力研究所 | Wind tunnel fan blade fixing device and wind tunnel fan with adjustable blade mounting angle |
| CN116576152B (en) * | 2023-07-12 | 2023-09-22 | 中国空气动力研究与发展中心低速空气动力研究所 | Wind tunnel fan blade fixing device and wind tunnel fan with adjustable blade mounting angle |
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