Ducted turbo-blowing windmill

Abstract

The present application relates to the field of wind power generation technology, and discloses a ducted double turbocharged windmill, which comprises a duct and a blade type rotating structure arranged in the duct. The duct comprises a first contraction section, a first straight section, a second contraction section and a second straight section in sequence along the wind direction, and the diameter of the first straight section is greater than that of the second straight section. The blade type rotating structure comprises a rotating shaft, a primary turbine and a secondary turbine arranged on the rotating shaft, the primary turbine and the secondary turbine are arranged in the first straight section and the second straight section respectively, and the rotating shaft is connected with a generator through a transmission structure. The present application improves the structure of the blade type rotating structure and the duct, and realizes that the turbine fan at the front end drives the turbine fan at the rear end to rotate, so as to improve the wind energy utilization rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind power generation, in particular to a ducted dual turbocharged windmill. BACKGROUND

[0002] The wind energy is converted into electric energy by the rotation of the blade, which is a common wind power generation method at present, mainly including open windmill and ducted windmill. The open windmill adopts a windmill blade structure, which is too large in size, and is suitable for windy areas with high cost. The ducted windmill includes a duct shell, and a turbine fan is installed in the duct shell. The ducted windmill utilizes the rotating turbine fan to extract kinetic energy from the fluid passing through it, and generates electricity through a generator. The ducted windmill is suitable for outdoor wind power generation, especially in high-altitude windy areas.

[0003] The existing ducted windmill has the problem of low wind energy utilization rate. For example, CN209943006U - a ducted turbine AC / DC wind power generator, the front impeller and the rear impeller are installed at the two ends of the AC / DC generator in the wind direction, and the front impeller and the rear impeller are installed in the equal diameter section of the shell. This installation method makes the front impeller and the rear impeller rotate independently, that is, the rotation of the front impeller cannot drive the rear impeller to rotate. The wind speed in the shell needs to reach a certain degree to realize the rotation of the front impeller and the rear impeller. In the case of low wind speed, only the front impeller can be driven to rotate, and the rear impeller cannot be driven to rotate, resulting in low wind energy utilization rate. SUMMARY

[0004] The purpose of the present application is to provide a ducted dual turbocharged windmill, which improves the structure by blade type rotation structure and duct, realizes the rotation of the turbine fan at the rear end driven by the turbine fan at the front end, and improves the wind energy utilization rate.

[0005] The present application is realized by the following technical scheme:

[0006] The ducted dual turbocharged windmill includes a duct and a blade type rotation structure arranged in the duct. The duct includes a first contraction section, a first straight section, a second contraction section and a second straight section in sequence along the wind direction, and the diameter of the first straight section is greater than that of the second straight section.

[0007] The blade type rotation structure includes a rotating shaft and a primary turbine and a secondary turbine arranged on the rotating shaft. The primary turbine and the secondary turbine are arranged in the first straight section and the second straight section respectively, and the rotating shaft is connected with the generator through a transmission structure.

[0008] The first contraction section and the second contraction section in the application have a gradually decreasing diameter from the direction of the wind flow, the first contraction section is the wind flow inlet section, the first straight section is the straightening section, the second straight section is the diffusion section, the external wind flow enters the first contraction section in the duct through the first contraction section, the wind flow in the first contraction section enters the first straight section, the first straight section has an equal diameter and a certain length, the wind flow is straightened in the first straight section, and a first turbine is arranged in the first straight section, the rotation of the first turbine has a pressurizing effect on the air flow, then the air flow enters the second contraction section, the diameter of the second contraction section is changed to further pressurize the air flow, the pressurized air flow enters the second straight section to accelerate the rotation of a second turbine, and the wind flow in the second straight section is discharged from the duct to realize diffusion.

[0009] That is, the duct of the application forms a double-curvature guide wall through the first contraction section and the second contraction section, can realize secondary acceleration of the wind flow in the duct, that is, the wind flow through the first contraction section is accelerated once due to the diameter change of the first contraction section, the wind flow through the second contraction section is accelerated twice due to the diameter change of the second contraction section, and the duct double-turbine pressurized windmill can also start when the wind speed is low; at the same time, the rotation of the first turbine in the first straight section also has a pressurizing effect on the air flow, that is, the application realizes double pressurization through the duct structure design and the rotation of the first turbine to ensure that the second turbine can better realize wind energy utilization and rapid rotation, thereby improving the wind energy utilization rate.

[0010] Furthermore, the first turbine and the second turbine of the application share a rotating shaft, realize coaxial double-rotor design, can realize rotation of the first turbine under the wind flow, thereby driving the rotating shaft to rotate, the rotation of the rotating shaft drives the rotation of the second turbine, the rotation of the first turbine and the second turbine can drive the rotating shaft to rotate rapidly, effectively provide the wind energy utilization rate, and avoid the problem of low wind energy utilization rate caused by independent arrangement of the front turbine and the rear turbine in the prior art.

[0011] In summary, the application improves the structure of the blade type rotation structure and the duct, realizes rotation of the turbine fan at the front end to drive the turbine fan at the rear end, and improves the wind energy utilization rate.

[0012] The duct double-turbine pressurized windmill of the application is suitable for outdoor places such as islands, border sentry posts, building tops, wind field power generation, and is especially superior to the prior art in power generation efficiency in outdoor places with low wind speed.

[0013] In a preferred mode, the ratio of the inlet diameter to the outlet diameter of the duct is (1.5-1.8):1.

[0014] The above diameter ratio setting can effectively improve the wind energy utilization rate.

[0015] In a preferred mode, the rotating shaft comprises a first shaft and a second shaft, and the first shaft and the second shaft are connected by a clutch coupling; the primary turbine and the secondary turbine are respectively installed on the first shaft and the second shaft.

[0016] The rotating shaft is optimized in the application, that is, two short shafts (the first shaft and the second shaft) are connected by a clutch coupling to form a long shaft, which has the advantage that the primary turbine facing the air inlet can rotate first under low wind speed, and the load of rotation is small (the other turbine (the secondary turbine) is not started); when the rotation speed of the primary turbine is increased, the secondary turbine can be driven to rotate, and through the above setting, different rotation speeds of the two turbines can be realized to maximize the conversion efficiency.

[0017] In a preferred mode, the primary turbine comprises a first hub and a first blade arranged on the first hub;

[0018] The outer wall of the rotating shaft is provided with a first annular groove for embedding the first hub, and the outer wall of the rotating shaft is provided with a second annular groove inside the first annular groove;

[0019] The ducted dual-turbocharged windmill further comprises a fastener embedded in the second annular groove and detachably connected with the first hub;

[0020] The fastener is arranged along the axial direction of the rotating shaft, and the part of the fastener protruding from the rotating shaft is arranged on the windward side of the first hub.

[0021] The primary turbine and the secondary turbine are more likely to be damaged than other components, especially the primary turbine located at the front end of the wind flow, which is more likely to be damaged when impurities such as sand are mixed in the wind flow, therefore, the damaged turbine needs to be replaced in time.

[0022] The application realizes the detachable connection of the primary turbine and the rotating shaft by using the locking member, and the above structure not only realizes the detachable connection of the primary turbine and the rotating shaft, but also realizes quick assembly and disassembly, so as to reduce the downtime during the replacement of the turbine.

[0023] In addition, compared with the traditional hub connected by radial bolts, the arrangement of the fastener has lower wind resistance; at the same time, the part of the fastener protruding from the rotating shaft is arranged on the windward side of the first hub, so that the fastener can be more firmly embedded in the second annular groove under the action of the wind flow, which is beneficial to improve the stability of the fastener fixed in the second annular groove.

[0024] In a preferred mode, the fastener is a split cone sleeve;

[0025] The split cone sleeve comprises at least two clamping plates, the circumferential width of the clamping plate gradually increases from one end to the other end of the insertion bottom of the second annular groove, and the end of the clamping plate with larger circumferential width extends outward along the radial direction to form a connecting plate; the connecting plate is connected with the first hub through bolts; the clamping plate and the second annular groove are in interference fit.

[0026] The split cone sleeve of the application can be more firmly embedded in the second annular groove under the action of wind flow.

[0027] In a preferred mode, the radial thickness of the clamping plate gradually increases from one end to the other end of the insertion bottom of the second annular groove.

[0028] That is, the circumferential width and the radial thickness of the clamping plate of the application are both gradually changed, which is beneficial to quickly and firmly embedding the second annular groove under the action of external force and wind flow.

[0029] In a preferred mode, an axial hole is formed in the rotating shaft, the axial hole is closed at the windward side and open at the other end; a first radial through groove is formed in the outer wall of the rotating shaft and penetrates the first annular groove and the second annular groove;

[0030] A center pull rod is arranged in the axial hole; the outer wall of the center pull rod is provided with a protrusion matched with the first radial through groove; the circumferential width of the protrusion has the same trend as the circumferential width of the clamping plate, the protrusion and the clamping plate are arranged in a spaced manner in the circumferential direction, and the protrusion can extrude the clamping plate in the circumferential direction.

[0031] The plurality of protrusions of the application are distributed in a spaced manner with the clamping plates of the split cone sleeve and are matched, that is, by pulling the center pull rod, the protrusion can be inserted between the adjacent two clamping plates, the center pull rod continuously maintains the pulling force, the protrusion generates a circumferential extrusion force on the clamping plate, so as to improve the stability of the clamping plate fixed on the outer wall of the rotating shaft, and then to ensure that the primary turbine is stably fixed in the first annular groove of the outer wall of the rotating shaft, and at the same time, the primary turbine is fixed by the bolt to avoid relative movement between the primary turbine and the rotating shaft, that is, to realize the fastening and installation of the primary turbine; on the contrary, by retracting the center pull rod and releasing the bolt, the primary turbine can be disassembled.

[0032] The secondary turbine of the application can also use the same fixing mode as the primary turbine.

[0033] In a preferred mode, the center pull rod comprises a first pull rod and a second pull rod, the protrusion is arranged on the outer wall of the first pull rod, and a circumferential limiting piece is arranged between the first pull rod and the axial hole; one end of the second pull rod is rotationally connected with the first pull rod, the second pull rod is axially displaced alone by rotating, and the other end of the second pull rod is connected with an extension piece, and the extension piece is rotated by a driving mechanism;

[0034] The rotating shaft comprises a first shaft and a second shaft, and the first shaft and the second shaft are connected through a clutch coupling;

[0035] The connecting position of the second contraction section and the second straight section is provided with an adjustable fairing, the adjustable fairing comprises a fixed cover and a sliding cover, one end of the fixed cover is fixed to the clutch coupling, and the other end is an open end; one end of the sliding cover is in sliding connection with the second shaft, and the other end is in sliding connection with the fixed cover.

[0036] The second shaft is provided with a second radial through groove, and the outer wall of the second pull rod is provided with a limiting block, which is connected with the sliding cover through the second radial through groove.

[0037] The center pull rod provided in the application can realize the synchronous axial displacement of the first pull rod and the second pull rod under the action of the axial tension, so that the limiting or releasing of the limiting block on the clamping plate is realized, and the independent axial displacement of the second pull rod can be realized by rotating the second pull rod, so that the adjustable fairing is driven to move axially, and the first pull rod will not move axially.

[0038] The application sets the adjustable fairing between the first contraction section and the second straight section of the duct, and through the rotation of the second pull rod, the fairing can move linearly along the axis of the rotating shaft, specifically: when the adjustable fairing moves forward (closer to the wind flow) and converges, a low pressure area (or an acceleration area) can be generated at the inlet, thereby enhancing the suction / local acceleration; moving backward reduces the induction and weakens the acceleration effect; and the adjusting structure is simple and does not require too many structural components; finally, the airflow before the second turbine is in the best way to contact the second turbine, thereby maximizing the wind energy recovery.

[0039] In a preferred mode, the circumferential limiting piece comprises a limiting strip arranged on the outer wall of the first pull rod, and the inner wall of the axial hole is provided with a strip-shaped clamping groove for clamping the limiting strip, the length direction of the strip-shaped clamping groove is the axial direction of the rotating shaft, and the limiting strip and the strip-shaped clamping groove have the same circumferential width.

[0040] The locking piece of the above structure can realize the axial displacement of the second pull rod under rotation without the axial displacement of the first pull rod.

[0041] In a preferred mode, the first pull rod and the second pull rod are connected through threads.

[0042] In a preferred mode, the driving mechanism comprises a gear pair, and the gear pair is arranged on the telescopic piece, and the telescopic piece is connected with the motor through the gear pair.

[0043] The application realizes the axial displacement of the center pull rod as a whole through the telescoping of the telescopic piece, and realizes the independent axial displacement of the second pull rod through the rotation of the second pull rod by the driving mechanism.

[0044] In a preferred mode, the outer wall of the telescopic piece is provided with a limiting groove, and the inner wall of the gear pair is provided with a limiting protrusion matched with the limiting groove. This arrangement can improve the stability of the connection between the gear pair and the telescopic piece.

[0045] In a preferred mode, the whole adjustable fairing is conical, and the outer wall of the sliding cover is in sliding connection with the inner wall of the fixed cover.

[0046] The adjustable fairing with the above structure has small wind resistance, and can reduce the influence of the adjustable fairing on the wind energy utilization rate.

[0047] In a preferred mode, the radial width of the first hub gradually increases from the windward side to the other side.

[0048] In a preferred mode, the protection cover is detachably connected with the first hub and the rotating shaft, and the first hub, the fastener, the first annular groove and the second annular groove are arranged in the protection cover.

[0049] The outer wall of the protection cover is a smooth curved surface, which has small wind resistance and can reduce the influence of the first hub, the fastener and the second annular groove on the wind energy utilization rate.

[0050] In a preferred mode, the rotating shaft is connected with the inner wall of the duct through a support, and the support includes a support support and an airfoil support.

[0051] In a preferred mode, the airfoil support is installed at the rear end of the primary turbine, so as to avoid the influence of the installed support on the primary turbine.

[0052] In a preferred mode, the front end of the primary turbine and / or the rear end of the secondary turbine is provided with a flow regulator.

[0053] In a preferred mode, the duct is fixedly installed through a base.

[0054] In a preferred mode, the transmission structure includes a straight bevel gear.

[0055] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0056] 1. The duct double turbocharged windmill of the application utilizes the design of coaxial double rotor to convert wind energy into mechanical energy, and then the mechanical energy is converted into electric energy in the generator, and on the one hand, the first stage turbine and the second stage turbine share a rotating shaft, realizing that the turbine fan at the front end drives the turbine fan at the rear end to rotate, improving the wind energy utilization rate; on the other hand, the duct is set as a double curvature guide wall, which can realize secondary acceleration of wind flow in the duct, and the duct double turbocharged windmill can also be started when the wind speed is low, and the wind energy utilization rate is further improved, that is, the duct double turbocharged windmill of the application has the advantages of high wind energy utilization rate.

[0057] 2. The application can realize quick assembly and disassembly of the first stage turbine by setting the split cone sleeve and the center pull rod in cooperation, and the connection stability between the first stage turbine and the rotating shaft is good.

[0058] 3. The application improves the rotating shaft, and the rotating shaft is designed as a first shaft and a second shaft connected by a clutch coupling, which can realize rotation of the first stage turbine and the second stage turbine under low wind speed, so as to maximize the conversion efficiency.

[0059] 4. The application sets an adjustable fairing, which can adjust the axial length of the adjustable fairing according to the wind speed in the duct, so that the wind flow enters the second stage turbine in a better state. DETAILED DESCRIPTION

[0060] The drawings described herein are used to provide further understanding of the embodiments of the application, constitute a part of the application, and do not constitute a limitation on the embodiments of the application. In the drawings:

[0061] Figure 1 It is a structural schematic view of the duct double turbocharged windmill of the application;

[0062] Figure 2 It is a sectional view of the duct double turbocharged windmill in embodiment 1 of the application;

[0063] Figure 3 It is a sectional view of the duct double turbocharged windmill in embodiment 4 of the application;

[0064] Figure 4 It is Figure 3 It is a local enlarged view of A in the figure;

[0065] Figure 5 It is Figure 3 It is a local enlarged view of B in the figure;

[0066] Figure 6 It is a sectional view of the rotating shaft in embodiment 4 of the application;

[0067] Figure 7 It is a schematic view of the cooperation between the shaft and the center pull rod in embodiment 4 of the application;

[0068] Figure 8 Structure diagram of split cone sleeve in embodiment 4 of the present application;

[0069] Figure 9 Structure diagram of first hub in embodiment 4 of the present application;

[0070] Figure 10 Structure diagram of semicircular clamping piece in embodiment 4 of the present application;

[0071] Figure 11 Structure diagram of duct double-turbocharged windmill in embodiment 4 of the present application.

[0072] Markings in the drawings and corresponding names of parts:

[0073] 1-duct; 2-rotating shaft; 3-first stage turbine; 4-second stage turbine; 5-straightener; 6-central pull rod; 7-split cone sleeve; 8-adjustable fairing; 9-telescopic piece; 10-gear pair;

[0074] 11-first contraction section; 12-first straight section; 13-second contraction section; 14-second straight section;

[0075] 21-axial hole; 22-first annular groove; 23-second annular groove; 24-first radial through groove; 25-second radial through groove; 26-protective cover; 27-clutch coupling;

[0076] 31-first hub; 32-first blade; 311-semicircular clamping piece; 312-positioning hole;

[0077] 61-protruding block; 62-limiting block;

[0078] 71-clamping plate; 72-connecting plate; 73-bolt; 721-through hole;

[0079] 81-fixed cover; 82-sliding cover; 91-limiting groove;

[0080] 100-base; 200-generator; 300-straight bevel gear; 400-supporting support; 500-wing type support. DETAILED DESCRIPTION

[0081] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with embodiments. The illustrative embodiments and their descriptions are only used to explain the present application and not as limitation of the present application. The following described embodiments are part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0082] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without these specific details. In other embodiments, well-known structures, materials or methods have not been specifically described in order to avoid obscuring the present application. The materials, instruments and reagents used in the following embodiments, etc. can be obtained from commercial channels unless otherwise specified. The technical means used in the embodiments are well known to those skilled in the art unless otherwise specified.

[0083] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0084] Embodiment 1:

[0085] As shown in Figure 1 , Figure 2 , the ducted dual turbocharged windmill includes a duct 1 and a blade rotating structure arranged in the duct 1, and the duct 1 is installed on a base 100. The duct 1 includes a first contraction section 11, a first straight section 12, a second contraction section 13 and a second straight section 14 in sequence along the wind flow direction, and the first contraction section 11, the first straight section 12, the second contraction section 13 and the second straight section 14 have the same thickness; the diameter of the first straight section 12 is greater than that of the second straight section 14, and preferably, the ratio of the inlet diameter to the outlet diameter of the duct 1 is 1.5-1.8:1; the diameters of the first contraction section 11 and the second contraction section 13 are gradually reduced from the front end to the rear end along the wind flow direction;

[0086] The blade rotating structure comprises a rotating shaft 2, a first turbine 3 and a second turbine 4 arranged on the rotating shaft 2, the first turbine 3 and the second turbine 4 are arranged on the first straight section 12 and the second straight section 14 respectively, and specifically, in the embodiment, the second turbine 4 is located at the front end of the second straight section 14; the rotating shaft 2 is connected with the generator 200 through a transmission structure. The first turbine 3 comprises a first hub 31 and a first blade 32 arranged on the first hub 31; the second turbine 4 and the first turbine 3 have the same structure.

[0087] In the embodiment, the rotating shaft 2 is fixed in the duct 1 through a support bracket 400, the support bracket 400 comprises a support and a bearing arranged on the top of the support, the bottom of the support is fixed on the inner wall of the duct 1, and the rotating shaft 2 is arranged in the bearing.

[0088] In the embodiment, the transmission structure is a straight bevel gear 300, the straight bevel gear 300 is arranged at the tail end of the rotating shaft 2, the generator 200 is located below the straight bevel gear 300 in the duct 1, the straight bevel gear 300 is composed of two meshing bevel gears, one of which is fixed at the tail end of the rotating shaft 2, and the other is connected with the generator 200 through a shaft.

[0089] In a preferred case, the front end of the first turbine 3 and / or the rear end of the second turbine 4 is provided with a rectifier 5.

[0090] The working principle of the embodiment is as follows:

[0091] The wind flow first enters the first turbine 3 to be accelerated once, then enters the first straight section 12 to make the first turbine 3 rotate, the rotation of the first turbine 3 drives the rotating shaft 2 to rotate, the rotation of the rotating shaft 2 drives the second turbine 4 to rotate, at the same time, the wind flow passes through the second contraction section 13 to be accelerated twice, then enters the second straight section 14 to make the second turbine 4 rotate faster, that is, the second turbine 4 rotates under the action of the rotating shaft and the wind flow, the rotation of the first turbine 3 and the second turbine 4 accelerates the rotation of the rotating shaft 2, the wind energy in the duct is converted into mechanical energy as much as possible, and then the mechanical energy is converted into electrical energy through the generator 200.

[0092] On the one hand, the embodiment shares one rotating shaft 2 for the first turbine 3 and the second turbine 4, realizes that the turbine fan at the front end, i.e. the first turbine 3, drives the turbine fan at the rear end, i.e. the second turbine 4, to rotate, and improves the wind energy utilization rate; on the other hand, the duct 1 is provided with double-curvature guide walls, which can realize the secondary acceleration of the wind flow in the duct 1, can realize that the duct double-turbine supercharged windmill can also be started when the wind speed is low, and further improves the wind energy utilization rate.

[0093] Embodiment 2:

[0094] As Figure 3As shown, the embodiment is based on embodiment 1, and the difference from embodiment 1 is that the support for fixing the rotating shaft 2 is different. In the embodiment, the wing-shaped support 500 is used to install the rotating shaft 2 in the duct 1. The specific shape of the wing-shaped support 500 is designed with reference to the wing of an airplane, and has small wind resistance. Specifically, in the embodiment, a bearing can be arranged on the rotating shaft 2, and a wing-shaped fixing plate is arranged on the outer wall of the bearing on both sides of the rotating shaft 2. One end of the wing-shaped fixing plate is connected with the bearing, and the other end is connected with the inner wall of the duct 1. Preferably, the wing-shaped support 500 is installed at the rear end of the primary turbine 3.

[0095] Compared with the support type support 400 in embodiment 1, the wing-shaped support 500 in the embodiment has smaller wind resistance, which is beneficial to improve the wind energy utilization rate.

[0096] In a preferred case, in order to further reduce the wind resistance in the duct 1, the bevel gear 300 and the generator 200 are arranged outside the duct 1, as shown in Figure 11 In the embodiment, the tail end of the rotating shaft 2 protrudes out of the duct 1, the bevel gear 300 is installed on the part of the rotating shaft 2 protruding out of the duct 1, and the generator 200 can be installed on the base 100 or a generator 200 installation support can be arranged on the outer wall of the tail end of the duct 1. The specific installation position of the generator 200 is not shown.

[0097] Embodiment 3:

[0098] As shown in Figure 3 , Figure 11 The embodiment is based on embodiment 1 or embodiment 2. In the embodiment, the rotating shaft 2 comprises a first shaft and a second shaft, and the first shaft and the second shaft are connected through a clutch coupling 27. The primary turbine 3 and the secondary turbine 4 are installed on the first shaft and the second shaft respectively.

[0099] In the embodiment, the first shaft and the second shaft are connected through the clutch coupling 27 to form the rotating shaft 2. In a low wind speed state, the primary turbine 3 facing the air inlet can be rotated first, because at this time the secondary turbine 4 has not started, so the load of the primary turbine 3 rotating is small. When the rotating speed of the primary turbine 3 is increased, the secondary turbine 4 can be driven to rotate. Through the arrangement, different rotating speeds of the two turbines can be realized to maximize the conversion efficiency.

[0100] Embodiment 4:

[0101] As shown in Figures 3-4 , Figures 6-11 The embodiment is based on any one of embodiments 1-3. In the embodiment, considering the loss of the primary turbine 3 and the secondary turbine 4, the primary turbine 3 and the secondary turbine 4 are arranged in a detachable manner with the rotating shaft 2.

[0102] And, in the embodiment, in order to avoid the traditional detachable connection is achieved by installing the bolt in the radial direction of the hub, but the radial installation of the bolt is equivalent to increase the radial area of the hub, which will cause the hub to produce larger wind resistance, which is not conducive to improve the wind energy utilization rate.

[0103] In the embodiment, it is achieved by the locking member arranged in the axial direction and the bolt 73 to reduce the wind resistance caused by the detachable connection of the primary turbine 3 and the secondary turbine 4. Specifically, in the embodiment, the outer wall of the rotating shaft 2 is provided with a first annular groove 22 for embedding the first hub 31, and the outer wall of the rotating shaft 2 is provided with a second annular groove 23 inside the first annular groove 22, and the specific shape of the second annular groove 23 is matched with the inserted locking member;

[0104] The ducted dual-turbocharged windmill further comprises a fastener for realizing the detachable connection of the primary turbine 3 and the rotating shaft 2, the fastener is embedded in the second annular groove 23 and detachably connected with the first hub 31; the fastener is arranged along the axial direction of the rotating shaft 2, and the part of the fastener protruding from the rotating shaft 2 is arranged on the windward side of the first hub 31, so as to realize that the locking member is firmly inserted in the second annular groove 23 through the wind flow pressure in the duct 1, and improve the stability of the connection between the primary turbine 3 and the rotating shaft 2.

[0105] Specifically, in the embodiment, the fastener is a split cone sleeve 7; the split cone sleeve 7 at least comprises two clamping plates 71, the circumferential width of the clamping plate 71 gradually increases from one end of the bottom of the second annular groove 23 to the other end, preferably, the radial thickness of the clamping plate 71 gradually increases from one end of the bottom of the second annular groove 23 to the other end, and the end of the clamping plate 71 with larger circumferential width extends outward along the radial direction to form a connecting plate 72, the connecting plate 72 is connected with the first hub 31 through the bolt 73, and specifically, the connecting plate 72 is provided with a through hole 721; the first hub 31 is composed of two semicircular clamping members 311 embedded with each other, as shown in Figure 9 、 Figure 10 The two semicircular clamping members 311 are buckled with each other through the steps, and the two semicircular clamping members 311 just enclose a circular ring, and the semicircular clamping member 311 is provided with a positioning hole 312 corresponding to the through hole 721, and the bolt 73 is fixed in the positioning hole 312 after penetrating through the through hole 721, and then the clamping plate 71 and the second annular groove 23 are matched in interference fit, so as to realize the detachable fixation of the primary turbine 3 on the rotating shaft 2 through the locking member; the secondary turbine 4 can adopt the same fixation mode as the primary turbine 3.

[0106] In a preferred case, the Chan dual-turbocharged windmill of the present embodiment further comprises a protective cover 26; the protective cover 26 is detachably connected with the first hub 31 and the rotating shaft 2, and can be achieved by matching the protrusions with the grooves; the first hub 31, the fastener, the first annular groove 22 and the second annular groove 23 are arranged in the protective cover 26; the outer wall of the protective cover 26 is a smooth curved surface. The outer wall of the protective cover 26 is a smooth curved surface, which has a small wind resistance and can reduce the influence of the first hub 31, the fastener and the second annular groove 23 on the wind energy utilization rate.

[0107] Embodiment 5:

[0108] As shown in Figures 3-4 , Figures 6-11 , the present embodiment is based on embodiment 4, and the structure of the rotating shaft 2 is further improved to further improve the fixing stability of the split cone sleeve 7 on the rotating shaft 2, and the center pull rod 6 is matched with the clamping plate 71 of the split cone sleeve 7 to generate a circumferential extrusion force on the clamping plate 71, thereby improving the stability of the split cone sleeve 7 after installation. Specifically, an axial hole 21 is formed in the rotating shaft 2, the axial hole 21 is closed at the windward side and open at the other end; a first radial through groove 24 is arranged on the outer wall of the rotating shaft 2 and penetrates the first annular groove 22 and the second annular groove 23;

[0109] The center pull rod 6 is arranged in the axial hole 21 and can be axially displaced in the axial hole 21 under the action of an external force. Specifically, a telescopic member 9 can be connected to the tail end of the center pull rod 6, which can be any existing technology that can achieve axial telescoping, such as a pneumatic cylinder, a hydraulic cylinder, an electric telescopic rod, etc. The telescopic member 9 drives the center pull rod 6 to axially displace. The outer wall of the center pull rod 6 is provided with a protrusion 61 matched with the first radial through groove 24; the circumferential width and radial thickness of the protrusion 61 have the same trend as the circumferential width and radial thickness of the clamping plate 71, and the protrusion 61 and the clamping plate 71 are arranged in a circumferential interval, and the protrusion 61 can extrude the clamping plate 71 in the circumferential direction.

[0110] In a preferred case, the radial width of the first hub 31 gradually increases from the windward side to the other side, i.e. the inner side of the first hub 31 forms a conical surface, and at this time, the radial width of the first annular groove 22 also gradually increases from the front end of the wind flow to the rear end.

[0111] The working principle of the present embodiment is as follows:

[0112] When the first-stage turbine 3 needs to be installed, the two semi-circular clips 311 of the first hub 31 are placed in the first annular groove 22 and fastened to form a ring. Then, the clip plate 71 of the split cone sleeve 7 is inserted into the second annular groove 23 for interference fit. The clip plate 71 and the first hub 31 are then connected by bolts 73. The central tie rod 6 is then pulled along the rear end of the airflow direction to insert the protrusion 61 between two adjacent clip plates 71. The central tie rod 6 maintains tension, and the protrusion 61 generates circumferential extrusion force on the clip plate 71 to improve the stability of the clip plate 71 fixed to the outer wall of the shaft 2. This ensures that the first-stage turbine 3 is stably fixed in the first annular groove 22 on the outer wall of the shaft 2, so as to avoid relative movement between the first-stage turbine 3 and the shaft 2, thus achieving the tight installation of the first-stage turbine 3. Conversely, the first-stage turbine 3 can be disassembled by retracting the central tie rod 6 and releasing the bolts 73.

[0113] Example 6:

[0114] like Figures 3-11 As shown, this embodiment is based on embodiment 5. The central tie rod 6 includes a first tie rod and a second tie rod. A protrusion 61 is disposed on the outer wall of the first tie rod. A circumferential limiting member is disposed between the first tie rod and the axial hole 21. Specifically, the circumferential limiting member includes a limiting strip disposed on the outer wall of the first tie rod. A strip-shaped groove for inserting the limiting strip is disposed on the inner wall of the axial hole 21. The length direction of the strip-shaped groove is the axial direction of the rotating shaft 2. The limiting strip and the strip-shaped groove have the same circumferential width. In this embodiment, the circumferential displacement of the first tie rod is restricted by the circumferential limiting member, so that the first tie rod can only perform axial displacement. One end of the second tie rod is rotatably connected to the first tie rod. Specifically, the first tie rod and the second tie rod are connected by a thread. The second tie rod can perform axial displacement independently by rotation. Since the first tie rod cannot rotate, when the second tie rod rotates, the second tie rod can perform axial displacement. The other end is connected to the telescopic member 9. The telescopic member 9 is rotated by a driving mechanism.

[0115] The rotating shaft 2 includes a first shaft and a second shaft, which are connected by a clutch coupling 27. Specifically, the drive mechanism includes a gear pair 10, which is mounted on the telescopic member 9. The telescopic member 9 is connected to the motor via the gear pair 10. More specifically, the gear pair 10 includes a driving wheel and a driven wheel that mesh with each other. The driving wheel is connected to the power output shaft of the motor, and the driven wheel is fixed to the outer wall of the fixed end of the telescopic member 9. Preferably, the outer wall of the telescopic member 9 is provided with a limiting groove 91, and the inner wall of the driven wheel is provided with a limiting protrusion that matches the limiting groove 91. The cooperation between the limiting protrusion and the limiting groove 91 improves the stability of the connection between the gear pair 10 and the telescopic member 9.

[0116] The connection between the second converging section 13 and the second straight section 14 is provided with an adjustable fairing 8, which comprises a fixed cover 81 and a sliding cover 82.

[0117] The second shaft is provided with a second radial through slot 25, and the second pull rod outer wall is provided with a limiting block 62, which is connected with the sliding cover 82 through the second radial through slot 25.

[0118] In a preferred case, the adjustable fairing 8 is conical as a whole, that is, the diameter of the adjustable fairing 8 gradually increases from the front end to the rear end of the wind flow, and the sliding cover 82 outer wall is slidably connected with the fixed cover 81 inner wall.

[0119] The working principle of the embodiment is as follows:

[0120] Through the rotation of the second pull rod, the adjustable fairing 8 can move linearly along the axis of the rotating shaft 2, specifically: when acceleration is needed, the adjustable fairing 8 is moved close to the front end of the wind flow, which can generate a low pressure area at the inlet, thereby enhancing the suction / local acceleration; on the contrary, when the adjustable fairing 8 is moved close to the rear end of the wind flow, the induction is reduced and the acceleration effect is weakened; the moving direction of the adjustable fairing 8 is determined according to the wind speed in the test tunnel 1, if the wind speed in the tunnel 1 is too low, acceleration is needed, otherwise deceleration is needed; finally, the airflow before the secondary turbine 4 is ensured to contact the secondary turbine 4 in the best way, so as to maximize the wind energy recovery.

[0121] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application, and it should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application, any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the protection scope of the present application.

[0122] It should be noted that the structure, proportion, size, etc. shown in the drawings attached to the present specification are only used to cooperate with the content disclosed in the specification, so that those skilled in the art can understand and read, and are not used to limit the conditions that the present application can be implemented, so they do not have technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that the present application can produce, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and the like in the present specification are only for the convenience of clear description, and are not used to limit the scope of the present application, and the change or adjustment of the relative relationship is also considered as the implementation of the present application without substantial changes in technical content.

Claims

1. A ducted turbo-blowing windmill comprising a duct (1) and a blade- type rotating structure arranged in the duct (1); characterized in that, The duct (1) includes a first contraction section (11), a first straight section (12), a second contraction section (13) and a second straight section (14) in sequence along the wind direction, the diameter of the first straight section (12) is greater than that of the second straight section (14); The vane rotating structure includes a rotating shaft (2) and a first turbine (3) and a second turbine (4) arranged on the rotating shaft (2), the first turbine (3) and the second turbine (4) are arranged in the first straight section (12) and the second straight section (14) respectively, and the rotating shaft (2) is connected with a generator (200) through a transmission structure; The first turbine (3) includes a first hub (31) and a first vane (32) arranged on the first hub (31); An outer wall of the rotating shaft (2) is provided with a first annular groove (22) for embedding the first hub (31), and an inner wall of the first annular groove (22) is provided with a second annular groove (23); The duct double-turbine supercharged windmill further includes a fastener embedded in the second annular groove (23) and detachably connected with the first hub (31); The fastener is arranged along the axial direction of the rotating shaft (2), and a part of the fastener protruding from the rotating shaft (2) is arranged on the windward side of the first hub (31); The fastener is a split cone sleeve (7); The split cone sleeve (7) includes at least two clamping plates (71), the circumferential width of the clamping plate (71) gradually increases from one end inserted into the bottom of the second annular groove (23) to the other end, and the end of the clamping plate (71) with a larger circumferential width extends outward along the radial direction to form a connecting plate (72); the connecting plate (72) is connected with the first hub (31) through a bolt (73); the clamping plate (71) and the second annular groove (23) are in interference fit; An axial hole (21) is formed in the rotating shaft (2), the axial hole (21) is closed at the windward side and open at the other end; an outer wall of the rotating shaft (2) is provided with a first radial through groove (24) penetrating the first annular groove (22) and the second annular groove (23); A center pull rod (6) is arranged in the axial hole (21); an outer wall of the center pull rod (6) is provided with a protrusion (61) matched with the first radial through groove (24); the circumferential width of the protrusion (61) has the same trend as that of the clamping plate (71), the protrusion (61) and the clamping plate (71) are arranged in the circumferential direction, and the protrusion (61) can extrude the clamping plate (71) in the circumferential direction; The center pull rod (6) comprises a first pull rod and a second pull rod, the protrusion (61) is arranged on the outer wall of the first pull rod, and a circumferential limiting piece is arranged between the first pull rod and the axial hole (21); one end of the second pull rod is rotationally connected with the first pull rod, axial displacement of the second pull rod is realized by rotation, and the other end is connected with the telescopic piece (9); the telescopic piece (9) is rotationally connected with the motor through the gear pair (10). The rotating shaft (2) comprises a first shaft and a second shaft, and the first shaft and the second shaft are connected through a clutch coupling (27). An adjustable fairing (8) is arranged at the connection between the second contraction section (13) and the second straight section (14), the adjustable fairing (8) comprises a fixed cover (81) and a sliding cover (82), one end of the fixed cover (81) is fixed to the clutch coupling (27), and the other end is an open end; one end of the sliding cover (82) is slidably connected with the second shaft, and the other end is slidably connected with the fixed cover (81). A second radial through groove (25) is arranged on the second shaft, and a limiting block (62) is arranged on the outer wall of the second pull rod, and the limiting block (62) is connected with the sliding cover (82) through the second radial through groove (25).

2. The turbofan windmill of claim 1, wherein, The ratio of the inlet diameter to the outlet diameter of the duct (1) is (1.5-1.8):

1.

3. The turbofan windmill of claim 1, wherein, The rotating shaft (2) comprises a first shaft and a second shaft, and the first shaft and the second shaft are connected through a clutch coupling (27); the first-stage turbine (3) and the second-stage turbine (4) are respectively arranged on the first shaft and the second shaft.

4. The turbo-dedicated windmill of claim 1, wherein, The radial thickness of the clamping plate (71) gradually increases from one end of the second annular groove (23) to the other end.

5. The turbofan windmill of claim 1, wherein, The circumferential limiting piece comprises a limiting strip arranged on the outer wall of the first pull rod, and a strip-shaped clamping groove is arranged on the inner wall of the axial hole (21) and clamps the limiting strip; the length direction of the strip-shaped clamping groove is the axial direction of the rotating shaft (2), and the limiting strip and the strip-shaped clamping groove have the same circumferential width.

6. The turbo-dedicated windmill of claim 1, wherein, The first pull rod and the second pull rod are connected through threads.

7. The turbo-dedicated windmill of claim 1, wherein, The driving mechanism comprises a gear pair (10), the gear pair (10) is arranged on the telescopic piece (9), and the telescopic piece (9) is connected with the motor through the gear pair (10).

8. The turbo-dedicated windmill of claim 7, wherein, A limiting groove (91) is arranged on the outer wall of the telescopic piece (9), and a limiting protrusion is arranged on the inner wall of the gear pair (10) and matched with the limiting groove (91).

9. The turbo-dedicated windmill of claim 1, wherein, The adjustable fairing (8) is conical as a whole, and the outer wall of the sliding cover (82) is slidably connected with the inner wall of the fixed cover (81).

10. The turbo-dedicated windmill of claim 1, wherein, The radial width of the first hub (31) gradually increases from one side to the other side.

11. The turbo-dedicated windmill of claim 1, wherein, Further comprising a protective cover (26); the protective cover (26) is detachably connected with the first hub (31) and the rotating shaft (2); the first hub (31), the fastener, the first annular groove (22) and the second annular groove (23) are arranged in the protective cover (26).

12. The turbo-dedicated windmill of claim 11, wherein, The outer wall of the protective cover (26) is a smooth curved surface.

13. The turbofan windmill of any one of claims 1-12, wherein, The rotating shaft (2) is connected with the inner wall of the duct (1) through a support.

14. The turbo-dedicated windmill of claim 13, wherein, The support includes a support support (400) or a wing type support (500).

15. The turbofan windmill of any one of claims 1-12, wherein, The wing type support (500) is installed at the rear end of the first turbine (3).

16. The turbofan windmill of any one of claims 1-12, wherein, The front end of the first turbine (3) and / or the rear end of the second turbine (4) is provided with a flow regulator (5).

17. The turbofan windmill of any one of claims 1-12, wherein, The duct (1) is fixedly installed through a base (100). The transmission structure includes a straight bevel gear (300).

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