Contra-rotating fan with blades switched under driving of motor

Abstract

The invention discloses a contra-rotating fan with blades switched under the driving of a motor, which belongs to the technical field of assembly equipment and comprises a fan cylinder, a rotary limiting body, an outer blade support, an outer blade limiting groove, an outer blade support rod, an inner blade support, blades, a contraction motor, a blade rotating rod and an outer blade support system. The inner-layer blades and the outer-layer blades rotate in opposite directions, the blades are completely unfolded when rotating to the power side and completely folded when rotating to the resistance side, and when one layer of blades is located on the power side, the other layer of blades is located on the resistance side. In the rotating process, the motor is used for switching the positions of the blades and the support system, position avoiding between the inner-layer blades and the outer-layer blades can be achieved more quickly, the problem that position avoiding between the inner-layer blades and the outer-layer blades is not in time at present is solved, the whole rotating space is reasonably utilized, and the wind energy utilization efficiency is improved; and reasonable avoidance of the inner blade bracket and the corresponding blades can be realized more quickly.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power generation, and in particular relates to a counter-rotating fan with blades switched by a motor. Background Art

[0002] Wind turbines can be generally divided into two categories: 1. Horizontal axis wind turbines, where the rotor's axis of rotation is parallel to the wind direction; 2. Vertical axis wind turbines, where the rotor's axis of rotation is perpendicular to the ground or the direction of the airflow. However, existing horizontal axis wind turbines still have the following three shortcomings: (1) excessive noise; (2) unstable power generation system with large fluctuations; (3) generators and other major components are located at high altitudes, resulting in high installation and maintenance costs. Therefore, industry technicians are also actively exploring new vertical axis wind turbines.

[0003] Compared with horizontal axis wind turbines, vertical axis wind turbines have the advantages of being able to be driven by light wind and being noiseless. Not only is the structural design simple, but it also reduces the gyroscopic force of the wind wheel against the wind. However, due to the very limited windward area of ​​the vertical axis wind turbine blades, the wind-to-motor conversion efficiency is low, and the CP value of the wind turbine performance does not exceed 0.4.

[0004] According to the working principle of wind turbine blades, vertical axis wind turbines are divided into lift type wind turbines and drag type wind turbines. According to the working mechanism or overall style of wind turbines, they are mainly divided into the following twelve types:

[0005] The first category: variable pitch vertical axis wind turbines, which are equipped with various types of variable pitch mechanisms to adjust the inclination angle of the blades or the windward area of ​​the blades, so as to achieve the purpose of increasing aerodynamic efficiency or resisting strong winds. The published variable pitch vertical axis wind turbines mainly include: H-type vertical axis wind turbine CN202211311521.X, vertical axis wind turbine CN202211275138.3; The second category: blade opening and closing vertical axis wind turbines, with small blades set on the blade frame, closing the small blades on the downwind side to increase wind resistance, and opening the small blades on the windward side to reduce wind resistance, thereby increasing the wind resistance difference on both sides and improving aerodynamic efficiency. The published blade opening and closing type vertical axis wind turbines mainly include: opening and closing type vertical axis fluid wheel power generation device CN202211247798.0, a flat sail type vertical axis wind turbine CN202211132558.6; the third category: combined vertical axis wind turbine, which combines various types of wind turbines together, such as lift type vertical axis wind turbine and resistance type vertical axis wind turbine, horizontal axis wind turbine and vertical axis wind turbine, vibration generator and vertical axis wind turbine, etc. The published combined vertical axis wind turbines mainly include: vertical axis wind power generation equipment CN202211234664.5, a vertical axis wind turbine multi-layer combined wind wheel CN202222516845.9; the fourth category: diversion type vertical axis wind turbine, which sets a diversion device on the outside of the rotating body of the wind turbine, so as to utilize part of the wind energy that could not be used before, and improve the aerodynamic efficiency. The published guide-type vertical axis wind turbines mainly include: a wind gathering device for a modular vertical axis wind turbine CN202211228306.3, and a guide-type vertical axis wind turbine structure CN202221687238.2; The fifth category: Magnus type vertical axis wind turbine. The rotating cylinder in the fluid will be subjected to a force perpendicular to the rotation axis and the flow direction. This phenomenon is called the Magnus effect. The wind turbine designed using the Magnus effect is a Magnus type vertical axis wind turbine. The published Magnus type vertical axis wind turbines are mainly Magnus type wind wheels and wind turbines CN202211151317.6; Category 6: blade slotted vertical axis wind turbines, which have air slots in the blades and use the acceleration effect of the airflow passing through the air slots to improve the aerodynamic efficiency of the wind turbine. The published blade slotted vertical axis wind turbines mainly include: a vertical axis wind turbine for improving wind energy utilization CN202220539639.7, and a synthetic jet jet vertical axis wind turbine blade CN201910705420.2; Category 7: special-shaped blade vertical axis wind turbines, which improve the aerodynamic efficiency of the vertical axis wind turbine by designing blades of different shapes.The published blade slotted vertical axis wind turbines mainly include: a coaxial counter-rotating vertical axis wind turbine generator set using bionic blades CN202210194747.X, a logarithmic spiral blade vertical axis wind power generation device CN202210071312.6; the eighth category: a wind tube type vertical axis wind turbine, which directs the wind at the bottom upward by setting a vertical wind tube, and uses the upward airflow to drive the impeller to rotate and generate electricity. The published wind tube type vertical axis wind turbine is mainly a wind tube type multi-wind rotor vertical axis wind power generation device CN202111065874.1; the ninth category: a counter-rotating vertical axis wind turbine, which sets two sets of inner and outer fan blades or two sets of upper and lower fan blades, and the two sets of fan blades rotate in opposite directions in different spaces, and the two sets of fan blades are respectively connected to the stator and rotor of the generator, thereby increasing the relative rotation speed of the stator and the rotor. The published paired vertical axis wind turbines mainly include: a vertical axis dual-drive wind power generation device CN202110577345.3, a bidirectional vertical axis frame wind turbine generator set CN202011259409.7; Category 10: Folding vertical axis wind turbine, which folds or unfolds the blades through a folding mechanism to achieve the purpose of breeze starting or strong wind resistance of the wind turbine. It belongs to one of the categories of variable pitch vertical axis wind turbines, but because it mainly achieves breeze starting or strong wind resistance through folding, it is listed as a separate category. The published folding vertical axis wind turbines mainly include: a vertical axis wind turbine blade device CN202110229578.4, a vertical axis wind turbine based on a speed regulation mechanism CN202010793558.5; Category 11: Umbrella-type vertical axis wind turbine, which uses umbrellas instead of blades, opens the umbrella on the downwind side, and closes the umbrella on the windward side, thereby increasing the wind resistance difference on both sides and improving aerodynamic efficiency. It belongs to one of the categories of variable-pitch vertical axis wind turbines, but because of its particularly strange style, it is listed as a separate category. The published umbrella-type vertical axis wind turbines mainly include: vertical axis wind turbine blade device CN202010783320.4 and umbrella-type sail blade wind turbine CN200820090746.6; Category 12: high-altitude floating vertical axis wind turbine, whose working mechanism belongs to the common vertical axis wind turbine, but because it floats in the sky and can utilize the larger wind energy at high altitude, and its style is unique, it is listed as a separate category. The published high-altitude floating vertical axis wind turbines mainly include: a high-altitude floating vertical axis wind turbine generator set CN201710623545.1, a high-altitude vertical axis wind turbine generator CN201621071587.6.

[0006] The main reason why the existing vertical axis wind turbines are difficult to apply is their low efficiency. However, among the twelve existing vertical axis wind turbines, except for the guide type vertical axis wind turbine, the other types of vertical axis wind turbines are still inefficient. The main reason is that if the rotation space of the fan blades is divided into two sides, with the downwind side and the windward side each occupying half, the wind on the downwind side does positive work on the fan, and the wind on the windward side does negative work on the fan, and the resistance on the windward side cannot be completely zero, so the CP value of the existing eleven types of vertical axis fans is less than 0.5. The guide mechanism has a high application value in small fans, but in large wind turbines, it is not realistic to set up a large guide mechanism separately from the blades. Not only does it increase the cost, but the force and space problems of the large guide mechanism will limit the application of the guide type vertical axis fan. Summary of the invention

[0007] The purpose of the present invention is to solve the problem that when the existing resistance-type vertical axis fan rotates, one side is powered while the other side is powered. Even if the blades are folded, the folding frame will still occupy the space on the resistance side, thereby reducing the utilization rate of wind energy in the blade rotation area. A motor-driven blade switching counter-rotating fan is proposed. By setting the inner and outer layers of blades to rotate in opposite directions, the blades are fully unfolded when they rotate to the power side, and fully retracted when they rotate to the resistance side, and one layer of blades is on the power side while the other layer of blades is on the resistance side. During the rotation process, the position of the blade and the bracket system is switched by the motor, which can more quickly achieve the position avoidance between the inner and outer layers of blades, solving the problem that when the existing resistance-type vertical axis fan rotates, one side is powered while the other side is powered. It also solves the problem that the position avoidance between the inner and outer layers of blades is not timely, and achieves the rational use of the entire rotating space, improves the efficiency of wind energy utilization, and can more quickly achieve the rational avoidance of the inner blade bracket and the corresponding blades.

[0008] In order to solve the above technical problems, the present invention provides a counter-rotating fan with motor-driven blade switching, comprising: a fan column, a rotation limiter, an outer blade support system, an inner blade support, blades, a retraction motor and a blade rotation rod; the rotation limiter is fixedly arranged at the upper and lower parts of the fan column, the outer blade support system is installed in the rotation limiter, the inner blade support is installed in the outer blade support system, the blades, the retraction motor and the blade rotation rod are installed on the outer blade support system and the inner blade support; the outer blade support system and the inner blade support rotate in opposite directions driven by the blades, and during the rotation process, the blades and the corresponding supports in the outer blade support system switch their mechanism positions driven by the motor.

[0009] Preferably, a rotation limiting through hole is provided in the middle of the rotation limiting body to form a rotation limiting wall ring, and rotation limiting blocks are fixedly sleeved at both ends of the rotation limiting wall ring, wherein the rotation limiting through hole is used to realize fixed sleeve connection between the rotation limiting body and the fan column.

[0010] Preferably, the outer blade support system includes an outer blade support, an outer blade limiting groove, a lifting threaded rod, a lifting motor, a first gear, a fixing pin, a compression spring, an electromagnet and an outer blade support rod.

[0011] Preferably, the outer blade bracket is in the form of a circular ring, with an outer blade bracket hole arranged in the middle, and the main body is an outer blade bracket ring; a bracket annular groove is arranged in the middle of the side of the outer blade bracket ring in an annular direction, and a plurality of groups of switching motor mounting bosses are symmetrically arranged at the bottom of the outer blade bracket ring, and a threaded rod mounting hole and a switching motor mounting hole are arranged at the top of the switching motor mounting boss, and an outer blade bracket rod mounting groove is arranged on the outer blade bracket ring corresponding to the center position of each group of switching motor mounting bosses, and the outer blade bracket rod mounting groove is divided into two parts, an upper and lower part, by the bracket annular groove, and the outer blade bracket rod mounting grooves in the upper and lower parts are each provided with an outer blade bracket fixing hole, and the outer blade bracket rod mounting groove is also provided with an outer blade bracket sliding groove.

[0012] Preferably, the outer blade support rod comprises an outer blade support rod body, a first blade groove is arranged in the middle of the length direction of the outer blade support rod body, two lifting support bosses are arranged at one end of the outer blade support rod body, a lifting support hole is arranged on the lifting support boss perpendicular to the setting direction of the lifting support boss, two lifting limit bosses are arranged at the end position of the outer blade support rod body near the lifting support boss, a first fixing hole of the support rod is arranged on the end face of the outer blade support rod body near the lifting limit boss, and a first rotating rod stabilizing boss is arranged at the other end of the outer blade support rod body.

[0013] Preferably, an electromagnet is fixedly connected to the first fixing hole of the support rod in the outer blade support rod, and the compression spring and the fixing pin are placed in the first fixing hole of the support rod in sequence, wherein the protruding part of the fixing pin after placement is outside the first fixing hole of the support rod; the lifting limit boss of the outer blade support rod is inserted into the outer blade support sliding groove on the outer blade support, wherein two adjacent outer blade support rods are placed at the positions corresponding to the outer blade support fixing holes at the lower position of the outer blade support, and the other two adjacent outer blade support rods are placed at the positions corresponding to the outer blade support fixing holes at the upper position of the outer blade support; one end of the lifting threaded rod is placed in the threaded rod mounting hole, and the other ends of the two lifting threaded rods are inserted into the lifting support hole on the outer blade support rod, the lifting motor is fixedly arranged in the switching motor mounting hole, and the first gear is fixedly arranged on the rotating shaft on the lifting motor, and the first gear is kept in meshing with the lifting threaded rod.

[0014] Preferably, the inner blade bracket is in the form of a frame connected in an upper and lower layer, an inner blade bracket ring is provided at the intersection of the inner blade bracket rods of the inner blade bracket, no less than four inner blade bracket rods are radially symmetrically distributed around the inner blade bracket ring, a second blade groove is provided in the middle part of the length direction of the inner blade bracket rod, a second rotating rod stabilizing boss is provided at the junction of the upper inner blade bracket rod and the inner blade bracket ring, inner blade bracket vertical rods are correspondingly connected between the upper and lower layers of the inner blade bracket rods, and inner blade limiting grooves are provided on the inner side of the inner blade bracket vertical rod facing the inner blade bracket ring.

[0015] Preferably, the inner blade bracket ring is arranged corresponding to the bracket annular groove, one group of contraction motors is fixedly installed on the outer end of the inner blade bracket rod, and the other group of contraction motors is fixedly installed on the inner end of the outer blade bracket rod.

[0016] Preferably, one end of the blade rotating rod is fixed to the rotating shaft of the contraction motor, and the other end is fixed to the first rotating rod stabilizing boss or the second rotating rod stabilizing boss, the blade is arranged in the first blade groove or the second blade groove, one side of the blade is fixedly connected to the blade rotating rod, and the other side is connected to the outer blade support rod or the inner blade support rod of the next layer through an elastic pull rope.

[0017] Beneficial effects of the present invention:

[0018] 1. This solution sets the inner and outer layers of blades to rotate in opposite directions. When the blades rotate to the power side, they are fully unfolded, and when the blades rotate to the resistance side, they are fully retracted. When one layer of blades is on the power side, the other layer of blades is on the resistance side. During the rotation process, the position of the blades and the bracket system is switched by the motor, which can more quickly achieve the position avoidance between the inner and outer layers of blades, solving the problem that when the existing resistance-type vertical axis fan rotates, one side is powered while the other side is subject to resistance. It also solves the problem that the position avoidance between the existing inner and outer layers of blades is not timely, realizing the rational use of the entire rotating space, improving the efficiency of wind energy utilization, and more quickly achieving the rational avoidance of the inner blade bracket and the corresponding blades.

[0019] 2. This solution can achieve reasonable avoidance of the inner blade bracket and the corresponding blade more quickly by switching the position of the blades and the corresponding brackets in the outer blade bracket system driven by a motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings. The drawings are only for the purpose of illustrating preferred embodiments and are not to be considered as limiting the present invention. Also, the same reference symbols are used throughout the drawings to represent the same parts.

[0021] Figure 1 It is a schematic diagram of the overall assembly of the present invention;

[0022] Figure 2 It is a schematic diagram of a fan column of the present invention;

[0023] Figure 3 It is a schematic diagram of the rotation limiting body of the present invention;

[0024] Figure 4 It is a schematic diagram of the assembly of the rotation limiter of the present invention;

[0025] Figure 5 It is a schematic diagram of the outer blade support of the present invention;

[0026] Figure 6 It is a schematic diagram of the outer blade support rod of the present invention;

[0027] Figure 7 It is an exploded schematic diagram of the outer blade support system of the present invention;

[0028] Figure 8 It is a schematic diagram of the assembly of the outer blade support system of the present invention;

[0029] Fig. 9 It is a schematic diagram of the inner blade support of the present invention;

[0030] Fig.10 It is an assembly diagram of the inner blade support and outer blade support system of the present invention;

[0031] Fig.11 This is an assembly diagram of the blade and bracket system of the present invention.

[0032] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0033] 100, fan column; 200, rotation limit body; 201, rotation limit through hole; 202, rotation limit wall ring; 203, rotation limit stopper; 3000, outer blade bracket system; 300, outer blade bracket; 301, outer blade bracket ring; 302, outer blade bracket hole; 303, bracket annular groove; 304, switching motor mounting boss; 305, threaded rod mounting hole; 306, switching motor mounting hole; 307, outer blade bracket rod mounting groove; 308, outer blade bracket fixing hole; 309, outer blade bracket sliding groove; 320, outer blade limiting groove; 330, lifting threaded rod; 340, lifting motor; 350, first gear; 360, fixing pin; 370, compression spring; 380, electromagnet; 400, outer blade support rod; 401, outer blade support rod body; 402, first blade slot; 403, lifting support boss; 404, lifting limit boss; 405, first fixing hole of support rod; 406, first rotating rod stabilizing boss; 407, lowering support hole; 500, inner blade support; 501, inner blade support ring; 502, inner blade support rod; 503, second blade slot; 504, second rotating rod stabilizing boss; 505, inner blade support vertical rod; 506, inner blade limiting slot; 600, blade; 700, retraction motor; 800, blade rotating rod. DETAILED DESCRIPTION

[0034] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific implementation method described herein is only an optimal embodiment of the present invention, which is only used to explain the present invention and does not limit the scope of protection of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] Example 1: Figure 1 As shown, a counter-rotating fan with motor-driven blade switching includes:

[0036] Fan column 100; rotation limiter 200; outer blade bracket 300; outer blade limiting groove 320; outer blade bracket rod 400; inner blade bracket 500; blade 600; retraction motor 700; blade rotation rod 800; outer blade bracket system 3000; Figure 1It is a schematic diagram of the overall assembly of the fan, which is mainly composed of a fan column 100, a rotation limiter 200, an outer blade support system 3000, an inner blade support 500, a blade 600, a retraction motor 700 and a blade rotation rod 800. The outer blade support system 3000 mainly includes an outer blade support 300, an outer blade limiting groove 320 and an outer blade support rod 400, and of course also includes some other parts that cannot be seen from the outside. The rotation limiter 200 is fixed to the upper and lower sides of the fan column 100, the outer blade support system 3000 is installed in the rotation limiter 200, the inner blade support 500 is installed in the outer blade support system 3000, and the blade 600, the retraction motor 700 and the blade rotation rod 800 are installed on the outer blade support system 3000 and the inner blade support 500. After installation, the outer blade support system 3000 and the inner blade support 500 rotate in opposite directions driven by the blades 600. During the rotation, the blades 600 and the corresponding supports in the outer blade support system 3000 switch their positions driven by the motor, thereby avoiding the inner blade support 500 and the corresponding blades 600. At the same time, the blades 600 in the outer blade support system 3000 and the inner blade support 500 unfold when they move to the power side, and fold when they move to the resistance side, thereby realizing the rational use of the entire rotating space and improving the efficiency of wind energy utilization.

[0037] The first fixing hole 405 of the outer blade support rod 400 is fixedly connected with an electromagnet 380, and the compression spring 370 and the fixing pin 360 are sequentially placed in the first fixing hole 405 of the support rod, wherein the protruding portion of the fixing pin 360 after placement is outside the first fixing hole 405 of the support rod; the lifting limit boss 404 of the outer blade support rod 400 is inserted into the outer blade support sliding groove 309 on the outer blade support 300, wherein two adjacent outer blade support rods 400 are placed in the outer blade support fixing hole 308 at the lower position of the outer blade support 300 Corresponding to the position, the other two adjacent outer blade support rods 400 are placed at the position corresponding to the outer blade support fixing hole 308 at the upper position of the outer blade support 300; one end of the lifting threaded rod 330 is placed in the threaded rod mounting hole 305, and the other ends of the two lifting threaded rods 330 are inserted into the lifting support hole 407 on the outer blade support rod 400, the lifting motor 340 is fixedly set in the switching motor mounting hole 306, and the first gear 350 is fixedly set on the rotating shaft on the lifting motor 340, and the first gear 350 remains engaged with the lifting threaded rod 330. After installation, the electromagnets 380 in two of the outer blade support rods 400 are started, and the fixing pins 360 are sucked into the first fixing hole 405 of the support rod by the electromagnets 380, and then the lifting motor 340 is started, and the lifting threaded rod 330 is pushed upward under the drive of the first gear 350, thereby pushing the two outer blade support rods 400 to move upward. When moving to the top position, the electromagnet 380 is stopped from being energized, and the fixing pins 360 in the first fixing hole 405 of the support rod are ejected outward by the compression spring 370 and inserted into the outer blade support fixing hole 308 at the upper position of the outer blade support 300, and then the lifting motor 340 is rotated in the reverse direction to reset the lifting threaded rod 330 downward. Through the above-mentioned motion coordination, the outer blade support rod 400 at the lower position can be fixed to the upper position. When it is necessary to move the outer blade support rod 400 at the upper position to the lower position, it is only necessary to start the electromagnet 380 to suck the fixing pin 360 into the first fixing hole 405 of the support rod, and the outer blade support rod 400 will move downward under the action of gravity. When it moves to the bottom, the electromagnet 380 is powered on, and the fixing pin 360 inside the first fixing hole 405 of the support rod is compressed by the spring 370 and popped outward and inserted into the outer blade support fixing hole 308 at the lower position of the outer blade support 300.

[0038] Figure 2 is a schematic diagram of the fan column, such as Figure 2 As shown, the fan column 100 is mainly in the form of a column.

[0039] Figure 3 is a schematic diagram of the rotation limiter, such as Figure 3As shown, the rotation limiting body 200 is in the form of a circular ring, with a rotation limiting through hole 201 in the middle, a rotation limiting wall ring 202 on the outside, and rotation limiting blocks 203 on the upper and lower sides.

[0040] Figure 4 It is the assembly diagram of the rotation limiter, such as Figure 4 As shown, the rotation limiting through holes 201 on the upper and lower rotation limiting bodies 200 are inserted into the fan column 100 and fixed tightly, so that the rotation limiting bodies 200 can be assembled.

[0041] Figure 5 is a schematic diagram of the outer blade bracket, such as Figure 5 As shown, the outer blade bracket 300 is in the form of a circular ring, with an outer blade bracket hole 302 in the middle and an outer blade bracket ring 301 around it. A bracket annular groove 303 is provided in the middle of the outer blade bracket ring 301, and four groups of switching motor mounting bosses 304 are symmetrically provided at the bottom of the outer blade bracket ring 301. The switching motor mounting bosses 304 are provided with threaded rod mounting holes 305 and switching motor mounting holes 306. An outer blade bracket rod mounting groove 307 is provided on the outer blade bracket ring 301 corresponding to the center position of each group of switching motor mounting bosses 304, and the outer blade bracket rod mounting groove 307 is divided into upper and lower parts by the bracket annular groove 303. An outer blade bracket fixing hole 308 is provided on each of the upper and lower outer blade bracket rod mounting grooves 307, and an outer blade bracket sliding groove 309 is also provided on the outer blade bracket rod mounting groove 307.

[0042] Figure 6 is a schematic diagram of the outer blade support rod, such as Figure 6 As shown, the outer blade support rod 400 is mainly composed of an outer blade support rod body 401. A first blade groove 402 is provided in the middle of the outer blade support rod body 401, one end of which is provided with two lifting support bosses 403, and a lifting support hole 407 is provided on the lifting support boss 403. Two lifting limit bosses 404 are provided at the end position of the lifting support boss 403 near the end of the outer blade support rod body 401. A support rod first fixing hole 405 is provided at the end position of the outer blade support rod body 401 near one end of the lifting limit boss 404. A first rotating rod stabilizing boss 406 is provided at the other end of the outer blade support rod body 401 opposite to the support rod first fixing hole 405.

[0043] Figure 7 This is an exploded view of the outer blade support system. Figure 8 This is the assembly drawing of the outer blade support system. Figures 5 to 8As shown, the outer blade support system 3000 is mainly composed of an outer blade support 300, an outer blade limiting groove 320, a lifting threaded rod 330, a lifting motor 340, a first gear 350, a fixing pin 360, a compression spring 370, an electromagnet 380 and an outer blade support rod 400. The electromagnet 380 is inserted into the first fixing hole 405 of the support rod in the outer blade support rod 400 and fixed tightly, and then the compression spring 370 and the fixing pin 360 are placed in the first fixing hole 405 of the support rod in sequence, and the protruding part of the fixing pin 360 is outside the first fixing hole 405 of the support rod after being placed. Start the electromagnet 380, suck the fixing pin 360 into the first fixing hole 405 of the support rod, then insert the lifting limit bosses 404 on the four outer blade support rods 400 into the outer blade support sliding grooves 309 on the outer blade support 300, place two adjacent outer blade support rods 400 at the positions corresponding to the outer blade support fixing holes 308 at the lower position of the outer blade support 300, and place the other two adjacent outer blade support rods 400 at the positions corresponding to the outer blade support fixing holes 308 at the upper position of the outer blade support 300. Place one end of the lifting threaded rod 330 in the threaded rod mounting hole 305 on the outer blade support 300, and insert the other ends of the two lifting threaded rods 330 into the lifting support holes 407 on the outer blade support rod 400. Fix the lifting motor 340 in the switching motor mounting hole 306, and fix the first gear 350 on the rotating shaft on the lifting motor 340, and the first gear 350 is kept in mesh with the lifting threaded rod 330. The outer blade limiting groove 320 is fixed on the switching motor mounting boss 304 on the outer blade bracket 300 .

[0044] Fig. 9 is a schematic diagram of the inner blade bracket, such as Fig. 9 As shown, the inner blade support 500 is a frame form with two layers connected together. The center of the upper and lower layers of the inner blade support 500 is the inner blade support ring 501, and four or more inner blade support rods 502 are radially symmetrically distributed around the inner blade support ring 501. The middle of the inner blade support rod 502 is provided with a second blade groove 503, and the upper inner blade support rod 502 is provided with a second rotating rod stabilizing boss 504 near the inner blade support ring 501. The inner blade support vertical rod 505 is connected between the upper and lower inner blade support rods 502, and the inner blade support vertical rod 505 is provided with an inner blade limiting groove 506.

[0045] Fig.10 This is the assembly drawing of the inner blade bracket and outer blade bracket system. Figure 8After the outer blade support system 3000 is assembled in the manner shown, the inner blade support ring 501 of the inner blade support 500 is inserted into the support annular groove 303 on the outer blade support 300 to assemble the inner blade support 500 and the outer blade support system 3000. Usually, the inner blade support ring 501 of the inner blade support 500 is in the form of two halves, which is convenient for inserting into the support annular groove 303, and after the inner blade support ring 501 is inserted into the support annular groove 303, they are fixedly connected together.

[0046] Fig.11 This is the assembly diagram between the blade and the bracket system. Fig.10 The inner blade support 500 and the outer blade support system 3000 are assembled in the manner shown. One half of the retracting motor 700 is fixedly mounted on the outer end of the inner blade support rod 502, and the other half of the retracting motor 700 is fixedly mounted on the inner end of the outer blade support rod 400. One end of the blade rotating rod 800 is fixed on the rotating shaft of the retracting motor 700, and the other end is fixed on the first rotating rod stabilizing boss 406 or the second rotating rod stabilizing boss 504. The blade 600 is passed through the first blade slot 402 or the second blade slot 503, and one side of the blade 600 is fixedly connected to the blade rotating rod 800, and the other side is connected to the outer blade support rod 400 or the inner blade support rod 502 of the next layer through an elastic drawstring.

[0047] according to Fig.11 After the blade and bracket system are assembled in the manner shown, the outer blade bracket 300 is inserted into the rotation limiting wall ring 202 on the rotation limiting body 200, and the outer blade bracket 300 is pressed. Figure 4 The overall fan can be installed by fixing the rotation limiter 200 on the fan column 100 in the manner shown.

[0048] After the fan is installed as a whole, half of the blades 600 are retracted in the upper position by the blade rotating rod 800, and the other half of the blades 600 are in the unfolded state. When the blades 600 drive the inner blade support 500 to rotate counterclockwise under the action of wind force, the other half of the blades 600 drive the outer blade support system 3000 to rotate clockwise. During the rotation process, the outer blade support rod 400 in the outer blade support system 3000 in the unfolded state of the blades 600 is located in the inner space of the inner blade support rod 502 under the action of the lifting threaded rod 330, the lifting motor 340 and the first gear 350, and the outer blade support rod 400 not in the unfolded state of the blades 600 is located in the outer space of the inner blade support rod 502 under the action of the lifting threaded rod 330, the lifting motor 340 and the first gear 350. Therefore, during the movement, half of the outer blade support rod 400 is always located on the inner side of the inner blade support rod 502, and the other half of the outer blade support rod 400 is located on the outer side of the inner blade support rod 502, thereby achieving reasonable avoidance between the inner and outer blade support systems during the movement.

[0049] The above specific embodiments are preferred embodiments of the present invention, and are not intended to limit the specific implementation scope of the present invention. The scope of the present invention includes but is not limited to the present specific embodiments. All equivalent changes made in accordance with the shape, structure, and method of the present invention are within the protection scope of the present invention.

Claims

1. A counter-rotating fan with motor-driven blade switching, characterized in that: The invention comprises a fan column (100), a rotation limiting body (200), an outer blade support system (3000), an inner blade support (500), a blade (600), a retraction motor (700) and a blade rotation rod (800); the rotation limiting body (200) is fixedly arranged at the upper and lower parts of the fan column (100); the outer blade support system (3000) is installed in the rotation limiting body (200); the inner blade support (500) is installed in the outer blade support system (3000); the blade (600), the retraction motor (700) and the blade rotation rod (800) are installed on the outer blade support system (3000) and the inner blade support (500); the outer blade support system (3000) and the inner blade support (500) rotate in opposite directions under the drive of the blade (600); during the rotation process, the blade (600) and the corresponding support in the outer blade support system (3000) are driven by the motor to switch the mechanism position.

2. A counter-rotating fan with motor-driven blade switching according to claim 1, characterized in that: A rotation limiting through hole (201) is provided in the middle of the rotation limiting body (200), forming a rotation limiting wall ring (202), and rotation limiting blocks (203) are fixedly sleeved at both ends of the rotation limiting wall ring (202), wherein the rotation limiting through hole (201) realizes the fixed sleeve connection between the rotation limiting body (200) and the fan column (100).

3. A counter-rotating fan with motor-driven blade switching according to claim 1, characterized in that: The outer blade support system (3000) comprises an outer blade support (300), an outer blade limiting groove (320), a lifting threaded rod (330), a lifting motor (340), a first gear (350), a fixing pin (360), a compression spring (370), an electromagnet (380) and an outer blade support rod (400).

4. A counter-rotating fan with motor-driven blade switching according to claim 3, characterized in that: The outer blade support (300) is in the form of a circular ring, with an outer blade support hole (302) arranged in the middle, and the main body is an outer blade support ring (301); a support annular groove (303) is arranged in the middle of the side of the outer blade support ring (301) in an annular direction, and a plurality of groups of switching motor mounting bosses (304) are symmetrically arranged at the bottom of the outer blade support ring (301), and a threaded rod mounting hole (305) and a switching motor mounting hole (306) are arranged at the top of the switching motor mounting boss (304). An outer blade support rod mounting groove (307) is provided on the outer blade support ring (301) corresponding to the central position of each set of switching motor mounting bosses (304), and the outer blade support rod mounting groove (307) is divided into an upper and lower part by the support annular groove (303), and an outer blade support fixing hole (308) is provided on each of the upper and lower outer blade support rod mounting grooves (307), and an outer blade support sliding groove (309) is also provided on the outer blade support rod mounting groove (307).

5. A counter-rotating fan with motor-driven blade switching according to claim 4, characterized in that: The outer blade support rod (400) comprises an outer blade support rod body (401), a first blade groove (402) is arranged in the middle of the length direction of the outer blade support rod body (401), two lifting support bosses (403) are arranged at one end of the outer blade support rod body (401), a lifting support hole (407) is arranged on the lifting support boss (403) perpendicular to the setting direction of the lifting support boss (403), two lifting limit bosses (404) are arranged at the end position of the outer blade support rod body (401) near the lifting support boss (403), a support rod first fixing hole (405) is arranged on the end surface of the outer blade support rod body (401) near the lifting limit boss (404), and a first rotating rod stabilizing boss (406) is arranged at the other end of the outer blade support rod body (401).

6. A counter-rotating fan with motor-driven blade switching according to claim 5, characterized in that: An electromagnet (380) is fixedly connected to the first fixing hole (405) of the support rod in the outer blade support rod (400), and a compression spring (370) and a fixing pin (360) are sequentially placed in the first fixing hole (405) of the support rod, wherein the protruding portion of the fixing pin (360) after placement is outside the first fixing hole (405) of the support rod; the lifting limit boss (404) of the outer blade support rod (400) is inserted into the outer blade support sliding groove (309) on the outer blade support (300), wherein two adjacent outer blade support rods (400) are placed in the outer blade support fixing hole (309) at the lower position of the outer blade support (300); 8), the other two adjacent outer blade support rods (400) are placed at positions corresponding to the outer blade support fixing holes (308) at the upper position of the outer blade support (300); one end of the lifting threaded rod (330) is placed in the threaded rod mounting hole (305), the other ends of the two lifting threaded rods (330) are inserted into the lifting support holes (407) on the outer blade support rod (400), the lifting motor (340) is fixedly arranged in the switching motor mounting hole (306), the first gear (350) is fixedly arranged on the rotating shaft on the lifting motor (340), and the first gear (350) is kept in meshing with the lifting threaded rod (330).

7. The counter-rotating fan with motor-driven blade switching according to claim 1, characterized in that: The inner blade support (500) comprises an inner blade support ring (501), wherein the inner blade support ring (501) is arranged at the intersection of the inner blade support rods (502) of the inner blade support (500), and no less than four inner blade support rods (502) are radially symmetrically distributed around the inner blade support ring (501), and a second blade groove (503) is arranged in the middle of the inner blade support rod (502) in the longitudinal direction, and a second rotating rod stabilizing boss (504) is arranged at the intersection of the upper inner blade support rod (502) and the inner blade support ring (501), and inner blade support vertical rods (505) are correspondingly connected between the upper and lower inner blade support rods (502), and an inner blade limiting groove (506) is arranged on the inner side surface of the inner blade support vertical rod (505) facing the inner blade support ring (501).

8. A counter-rotating fan with motor-driven blade switching according to claim 7, characterized in that: The inner blade support ring (501) is arranged corresponding to the support annular groove (303), one group of contraction motors (700) is fixedly mounted on the outer end of the inner blade support rod (502), and another group of contraction motors (700) is fixedly mounted on the inner end of the outer blade support rod (400).

9. The counter-rotating fan with motor-driven blade switching according to claim 7, characterized in that: One end of the blade rotating rod (800) is fixed on the rotating shaft of the contraction motor (700), and the other end is fixed on the first rotating rod stabilizing boss (406) or the second rotating rod stabilizing boss (504); the blade (600) is arranged in the first blade groove (402) or the second blade groove (503); one side of the blade (600) is fixedly connected to the blade rotating rod (800), and the other side is connected to the outer blade support rod (400) or the inner blade support rod (502) of the next layer through an elastic pull rope.

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