Impeller system with adjustable impeller profile

Abstract

This application relates to a fan impeller system with an adjustable impeller profile, belonging to the technical field of fans. It includes a hub and several blades, with the blades evenly distributed along the outer periphery of the hub in a front-rear direction with the hub axis as the front-rear orientation. Bosses are evenly arranged on the hub, and the front side of the blade root is movably connected to one of the bosses. A wedge-shaped pad is provided between the rear side of the blade root and the boss to fill the gap between them. The blade root, wedge-shaped pad, and bosses are fixedly connected by bolts. This application allows for convenient adjustment of the blade installation angle to change the impeller profile by replacing wedge-shaped pads with different wedge angles, in conjunction with the rotatable connection at the front of the blade root. This effectively adapts to different airflow and pressure requirements under different operating conditions without requiring complete disassembly or replacement of the impeller.

Description

Technical Field

[0001] This application relates to the technical field of wind turbines, and in particular to a wind turbine impeller system. Background Technology

[0002] As a common type of fluid machinery, fans are widely used in various fields such as industrial production, building ventilation, and power equipment cooling. The core function of a fan is to drive gas flow through the rotation of its blades, thereby achieving ventilation, heat dissipation and cooling, gas pressurization and transportation in specific spaces or equipment, providing a basic guarantee for the normal operation of related scenarios.

[0003] In existing technologies, the airflow and pressure regulation of fans are mostly achieved by changing the rotational speed of the blades. Typically, the power of the fan's drive unit (such as a motor) can be adjusted. By changing the drive power, the blade speed is adjusted. When it is necessary to increase the airflow and pressure, the drive power is increased to raise the blade speed, thereby increasing the work done by the blades on the gas and pushing more gas to flow at higher pressure. When it is necessary to reduce the airflow and pressure, the drive power is reduced to lower the blade speed, weakening the effect of the blades on the gas and thus reducing the gas flow and pressure.

[0004] In addition to adjusting the fan speed to regulate the fan's air volume and pressure, adjusting the angle of the fan blades can also regulate the fan's air volume and pressure. Changes in the blade angle will change the interaction area and direction with the gas, thus affecting the pushing effect on the gas.

[0005] However, in the existing technology, the blade angle of most wind turbines is fixed at the factory and cannot be flexibly adjusted according to changes in actual working conditions. This makes it difficult for wind turbines to quickly adapt to the diverse needs for air volume and air pressure in different scenarios, thus limiting the adaptability of wind turbines in complex working conditions. Utility Model Content

[0006] In view of the shortcomings of the existing technology, one of the objectives of this utility model is to provide a fan impeller system with adjustable impeller profile.

[0007] This application provides a fan impeller system with adjustable impeller profile, which adopts the following technical solution:

[0008] An adjustable impeller system for a wind turbine includes a hub and several blades. The blades are evenly distributed along the outer periphery of the hub, with the hub axis as the front-rear direction. Bosses are evenly arranged on the hub, and the front side of the root of each blade is movably connected to one of the bosses.

[0009] A wedge-shaped pad is provided between the rear side of the blade root and the boss to fill the gap between them.

[0010] The blade root, wedge-shaped pad, and boss are fixedly connected by bolts.

[0011] By adopting the above technical solution, the movable connection design at the front of the blade root provides the necessary movable reference for blade angle adjustment, allowing the blade to rotate around the front. The wedge-shaped pad at the rear not only accurately fills the gap between the blade root and the boss, allowing the blade and the boss to fit tightly to maintain a stable specific installation angle, but also reserves operable space for subsequent blade angle adjustment. When adjustment is required, the wedge-shaped pad can be replaced or adjusted by loosening the bolts, without the need for complete disassembly or replacement of the impeller, greatly simplifying the adjustment operation.

[0012] At the same time, the bolts secure the blades, wedge-shaped pads, and bosses, ensuring the stability of the connection and preventing loosening due to vibration during fan operation, thus guaranteeing the reliability and safety of the impeller's long-term operation.

[0013] Preferably, the wedge-shaped pad has a surface connected to the boss and a surface connected to the blade, the two surfaces forming a wedge angle;

[0014] The surface where the wedge-shaped pad connects to the boss is rectangular, and the surface where the wedge-shaped pad connects to the blade is trapezoidal. The side of the trapezoid furthest from the hub is the upper base of the trapezoid, and the side of the trapezoid closest to the hub is the lower base of the trapezoid. The length of the upper base of the trapezoid is greater than the length of the lower base of the trapezoid.

[0015] It has two sets of the wedge-shaped pads, and the number of the wedge-shaped pads in each set is the same as the number of the blades;

[0016] Each individual wedge pad in each group of wedge pads has the same structure;

[0017] The wedge-shaped pads in different groups have different wedge angles, with the difference in wedge angles ranging from 5 to 10 degrees.

[0018] By adopting the above technical solution, two sets of wedge-shaped pads with different wedge angles are set up, and each set of wedge-shaped pads corresponds to a blade installation angle. The two sets of wedge-shaped pads with different wedge angles provide two blade angle options for the fan, enabling the fan to quickly match the corresponding blade installation angle according to the air volume and air pressure requirements in different scenarios, which greatly improves the fan's adaptability to complex and variable working conditions.

[0019] The correspondence between each set of wedge blocks and the specific blade installation angle eliminates the need for on-site measurement or adjustment of the wedge angle during the adjustment process. Simply replace the corresponding set of wedge blocks as needed to complete the angle switching, further simplifying the adjustment process and shortening the adjustment time.

[0020] Preferably, a first mounting through hole is provided below the wedge-shaped pad and on the side in front of the wedge-shaped pad, and the blade and the boss are provided with corresponding mounting through holes at the first mounting through hole of the wedge-shaped pad;

[0021] The wedge-shaped pad is connected to a first connecting ring, which passes through the first mounting through holes on all the wedge-shaped pads in the circumferential direction of the hub, as well as the corresponding mounting through holes on all the blades and bosses, forming a rotational connection between the blades and the bosses.

[0022] A first threaded through hole is provided below the wedge-shaped pad and on the side behind the wedge-shaped pad. The blade and the boss are provided with corresponding threaded through holes at the first threaded through hole of the wedge-shaped pad. The bolt passes through the boss, the wedge-shaped pad and the blade in sequence to form a fixed connection between the boss, the wedge-shaped pad and the blade.

[0023] By adopting the above technical solution, the first mounting through hole in front of the wedge-shaped pad cooperates with the corresponding mounting through holes of the blade and the boss, so that the first connecting ring can pass through all relevant components in the circumference of the hub. This not only provides a unified and stable reference axis for the rotation of the blade relative to the boss, but also avoids the deviation that is easy to occur when a single blade is set independently, and ensures the synchronization of all blades when they rotate.

[0024] The first threaded through hole behind the wedge-shaped pad is adapted to the corresponding threaded through holes of the blade and the boss, allowing the bolt to achieve a tight connection between the three in sequence. Together with the first connecting ring, it ensures that the blade can be accurately and firmly fixed after being adjusted to the target angle, preventing the blade from shifting due to force during high-speed rotation.

[0025] Preferably, the boss extends radially outward along the hub, with an extension length of 10-15 cm.

[0026] By adopting the above technical solution, the boss extends radially outward along the hub with an extension length of 10-15cm, which can provide assembly space for the placement of the wedge-shaped pad, the installation of the blade root, and the fixing of bolts, avoiding the problem of cramped assembly space caused by insufficient boss length; the boss extends radially outward along the hub by 10-15cm, which expands the contact force area between the boss and the wedge-shaped pad, avoiding loosening of the connection caused by the boss being too short.

[0027] Preferably, the boss and the wheel hub are integrally formed.

[0028] By adopting the above technical solution, the boss and the hub are integrally formed, which completely eliminates the assembly gap between the boss and the hub, avoids the positioning deviation caused by the gap during the assembly process of the split boss, and the integrally formed structure of the boss and the hub greatly improves the structural strength of the connection between the boss and the hub, so that the boss can provide more stable support for the blades and wedge-shaped pads when the fan is rotating at high speed.

[0029] Preferably, the installed wedge-shaped pad has an arrangement that extends radially outward along the hub, and the wedge angle is in the direction of radial outward extension along the hub, and the angle of the wedge angle remains unchanged;

[0030] The thickness of the wedge-shaped pad sandwiched between the blade and the boss gradually increases along the radially outward direction.

[0031] By adopting the above technical solution, the gap between the blade and the boss is narrower when they are close to the hub, and the wedge-shaped pad is thinner to fit the narrower gap; the gap between the blade and the boss is wider when they are farther away from the hub, and the wedge-shaped pad is thicker to completely fill the wider gap. This allows the wedge-shaped pad to fit tightly against the blade and the boss in the direction that extends radially outward from the hub. The design of the wedge-shaped pad extending radially outward from the hub from narrow to wide ensures that the wedge-shaped pad provides stable support for the blade after adjustment.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] 1. The movable connection design at the front of the blade root provides the necessary reference for blade angle adjustment, allowing the blade to rotate around the front. The wedge-shaped pad at the rear not only accurately fills the gap between the blade root and the boss, ensuring a tight fit between the blade and the boss to maintain a stable installation angle, but also provides operational space for subsequent blade angle adjustments. When adjustment is needed, the wedge-shaped pad can be replaced or adjusted by loosening the bolts, without the need for complete disassembly or replacement of the impeller, greatly simplifying the adjustment operation.

[0034] At the same time, the bolts are used to fix the blades, wedge-shaped pads and bosses, which can ensure the stability of the connection between the three and prevent the connection from loosening due to vibration during the operation of the fan, thus ensuring the reliability and safety of the impeller in long-term operation.

[0035] 2. Two sets of wedge-shaped pads with different wedge angles are set up, and each set of wedge-shaped pads corresponds to a blade installation angle. The two sets of wedge-shaped pads with different wedge angles provide two blade angle options for the fan, enabling the fan to quickly match the corresponding blade installation angle according to the air volume and air pressure requirements in different scenarios, which greatly improves the fan's adaptability to complex and variable working conditions.

[0036] The correspondence between each set of wedge blocks and the specific blade installation angle eliminates the need for on-site measurement or adjustment of the wedge angle during the adjustment process. Simply replace the corresponding set of wedge blocks as needed to complete the angle switching, further simplifying the adjustment process and shortening the adjustment time.

[0037] 3. The first mounting through hole in front of the wedge-shaped pad mates with the corresponding mounting through holes of the blade and the boss, so that the first connecting ring can pass through all relevant components in the circumference of the hub. This not only provides a unified and stable reference axis for the rotation of the blade relative to the boss, but also avoids the deviation that may occur when a single blade is set independently, ensuring the synchronization of all blades when they rotate.

[0038] The first threaded through hole behind the wedge-shaped pad is adapted to the corresponding threaded through holes of the blade and the boss, allowing the bolt to achieve a tight connection between the three in sequence. Together with the first connecting ring, it ensures that the blade can be accurately and firmly fixed after being adjusted to the target angle, preventing the blade from shifting due to force during high-speed rotation. Attached Figure Description

[0039] Figure 1 This is a front view of a fan impeller system with adjustable impeller profile, as shown in this embodiment of the application.

[0040] Figure 2 for Figure 1 The enlarged view in section A is a schematic diagram showing the connection relationship between the blade, wedge-shaped pad, and boss;

[0041] Figure 3 This is a schematic diagram illustrating the structure of the boss and wedge-shaped pad in an embodiment of this application.

[0042] Reference numerals in the attached drawings: 1. Hub; 2. Blade; 3. Boss; 4. Wedge-shaped pad; 5. Wedge angle; 6. First mounting through hole; 7. First connecting ring; 8. First threaded through hole. Detailed Implementation

[0043] The following is in conjunction with the appendix Figure 1 - Appendix Figure 3 This application will be described in further detail.

[0044] This application discloses a fan impeller system with adjustable impeller profile.

[0045] Reference Figure 1 and Figure 2 An adjustable impeller system for a wind turbine includes a hub 1 and several blades 2. The blades 2 are evenly distributed along the outer periphery of the hub 1, with the axial direction of the hub 1 as the front-rear direction. The outer periphery of the hub 1 is provided with evenly arranged bosses 3. The front side of the root of the blade 2 is movably connected to the bosses 3. A wedge-shaped pad 4 is provided between the rear side of the root of the blade 2 and the bosses 3 to fill the gap between them. The rear side of the root of the blade 2, the wedge-shaped pad 4, and the bosses 3 are fixedly connected by bolts.

[0046] When the fan is running, the front side of the blade 2 root is connected to the boss 3 via a movable connection, while the rear side is attached to the boss 3 via a wedge-shaped pad 4. Bolts pass through the corresponding holes of the blade 2 root, the wedge-shaped pad 4 and the boss 3 and are tightened to form a stable connection. At this time, the blade 2 maintains a specific installation angle under the support of the wedge-shaped pad 4 and rotates synchronously with the hub 1 to push the airflow.

[0047] The boss 3 extends radially outward along the hub 1, with its extension direction consistent with the radial direction of the hub 1. Its extension length is 10-15 cm, providing ample space and a stable support base for the installation of the wedge-shaped pad 4 and the blade 2. Preferably, in this embodiment, the extension length of the boss 3 is 10 cm. The boss 3 and the hub 1 are integrally molded, eliminating assembly gaps between them and improving the overall structural strength of the hub 1 and the boss 3.

[0048] The wedge-shaped pad 4 has a surface connected to the boss 3 and a surface connected to the blade 2; one side of the wedge-shaped pad 4 is in contact with the boss 3, and the surface of the wedge-shaped pad 4 facing away from the boss 3 is in contact with the blade 2; the surface of the wedge-shaped pad 4 connected to the boss 3 and the surface of the wedge-shaped pad 4 connected to the blade 2 form a wedge angle 5; the impeller system with adjustable impeller profile disclosed in this application has two sets of wedge-shaped pads 4, the number of wedge-shaped pads 4 in each set is the same as the number of blades 2, and the structure of each individual wedge-shaped pad 4 in each set is the same; different sets of wedge-shaped pads 4 have different wedge angles 5, and the difference in wedge angles 5 is between 5 and 10 degrees. In this embodiment, the wedge angles 5 of the two sets of wedge-shaped pads 4 differ by 5 degrees. If two sets of wedge-shaped pads 4 with a difference in wedge angles 5 of 10 degrees are selected, the rotation amplitude of the blade 2 will be adjusted by 10 degrees accordingly.

[0049] After installation, the wedge-shaped pad 4 is arranged to extend radially outward along the hub, with the wedge angle 5 extending radially outward along the hub and remaining constant. The thickness of the wedge-shaped pad 4 sandwiched between the blade 2 and the boss 3 gradually increases radially outward. The constant wedge angle 5 ensures that the contact surfaces of the wedge-shaped pad 4 with the blade 2 and the boss 3 always maintain a tight and uniform contact, preventing gaps from appearing in the contact area due to changes in the wedge angle 5, thus ensuring stable support of the wedge-shaped pad 4 for the blade 2. The gradually increasing thickness of the wedge-shaped pad 4 sandwiched between the blade 2 and the boss 3 allows for precise adaptation to the gap shape between the blade 2 and the boss 3.

[0050] When the impeller profile needs to be adjusted to adapt to different working conditions, since the front of the blade 2 is movably connected to the boss 3, the blade 2 can rotate slightly to facilitate the removal of the current set of wedge-shaped pads 4. According to the required blade 2 angle, select another set of wedge-shaped pads 4 with the corresponding wedge angle 5 and place them in the gap between the root of the blade 2 and the boss 3. Ensure that the connecting surfaces of the wedge-shaped pads 4 and the boss 3, and the connecting surfaces of the wedge-shaped pads 4 and the blade 2 are tightly fitted, so that the blade 2 is fixed under the support of the new wedge-shaped pads 4. At this time, the blade 2 rotates around the front connection point to a new installation angle due to the change of the wedge angle 5 of the wedge-shaped pads 4, forming a blade 2 installation angle corresponding to each set of wedge-shaped pads 4.

[0051] Reference Figure 2 and Figure 3 Below the wedge-shaped pad 4, and on the side in front of the wedge-shaped pad 4, a first mounting through hole 6 is provided. The blade 2 and the boss 3 are provided with corresponding mounting through holes at the first mounting through holes 6 of the wedge-shaped pad 4. The wedge-shaped pad 4 is connected to a first connecting ring 7. The first connecting ring 7 passes through the first mounting through holes 6 on all the wedge-shaped pads 4 around the hub 1. The first connecting ring 7 passes through the corresponding mounting through holes on all the blades 2 and the boss 3 around the hub 1, forming a rotational connection between the blade 2 and the boss 3. The rotation amplitude of the blade 2 can be adjusted by replacing different sets of wedge-shaped pads 4. Therefore, replacing a set of wedge-shaped pads 4 will adjust the rotation amplitude of the blade 2 by 5 degrees.

[0052] Below the wedge-shaped pad 4, and on one side behind the wedge-shaped pad 4, a first threaded through hole 8 is provided. The blade 2 and the boss 3 are provided with corresponding threaded through holes at the first threaded through hole 8 of the wedge-shaped pad 4. After the blade 2 rotates to a new angle, the first threaded through hole 8 of the wedge-shaped pad 4 will be precisely aligned with the threaded through holes of the blade 2 and the boss 3. A single bolt is sequentially threaded to the boss 3, the wedge-shaped pad 4 and the blade 2, and together with the first connecting ring 7, a fixed connection is formed between the boss 3, the wedge-shaped pad 4 and the blade 2.

[0053] The implementation principle of this application embodiment is as follows:

[0054] During the initial assembly of the wind turbine, several blades 2 are evenly arranged along the outer periphery of the hub 1. Then, a set of wedge-shaped pads 4 adapted to the initial angle of the blade 2 are placed in the gap between the root of each blade 2 and the boss 3. Next, the first connecting ring 7 is passed through all the bosses 3, blades 2 and wedge-shaped pads 4 around the hub 1 in sequence, so that the blades 2 and the bosses 3 form a rotatable connection. Then, a single bolt is threaded to the bosses 3, wedge-shaped pads 4 and blades 2 in sequence, and fixed in conjunction with the first connecting ring 7. At this time, the blades 2 maintain the initial installation angle under the support of the wedge-shaped pads 4, and the assembly is completed.

[0055] When the fan is running normally, the front of the blade 2 is rotatably engaged with the boss 3 through the first connecting ring 7, and the rear is tightly fitted with the boss 3 through the wedge-shaped pad 4. The bolt and the first connecting ring 7 together ensure the stable connection between the blade 2, the wedge-shaped pad 4 and the boss 3. The blade 2 rotates synchronously with the hub 1 and pushes the airflow at a specific angle under the support of the wedge-shaped pad 4 to meet the air volume and air pressure requirements of the current working condition.

[0056] When the impeller profile needs to be adjusted to adapt to new working conditions, first loosen the bolts to release the fixing constraints on the boss 3, wedge-shaped pad 4 and blade 2. According to the required blade 2 angle for the new working conditions, select another set of wedge-shaped pads 4 with a wedge angle 5 that differs by 5 degrees. Place them back into the gap between the root of blade 2 and the boss 3, ensuring that the wedge-shaped pad 4 is in close contact with the mating surfaces of the boss 3 and blade 2. As the wedge angle 5 of the wedge-shaped pad 4 changes, the blade 2 rotates around the first connecting ring 7 to the new angle. After the first threaded through hole 8 behind the new wedge-shaped pad 4 is precisely aligned with the threaded through holes of the boss 3 and blade 2, reconnect the bolts to the three in sequence with the first connecting ring 7 to restore a stable fixation. At this time, the blade 2 rotates with the hub 1 at the new installation angle, and the impeller runs stably under the adjusted profile, achieving adaptation to the new working conditions.

[0057] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fan impeller system of a blade profile adjustable type, comprising a hub (1) and a plurality of blades (2), the plurality of blades (2) being uniformly distributed along the outer peripheral side of the hub (1), characterized in that, With the hub (1) axis as the front-to-back direction, the hub (1) is evenly distributed with bosses (3), and the front side of the root of the blade (2) is movably connected to the bosses (3); A wedge-shaped pad (4) is provided between the rear side of the root of the blade (2) and the boss (3) to fill the gap between them; The root of the blade (2), the wedge-shaped pad (4), and the boss (3) are fixedly connected by bolts.

2. The impeller profile adjustable fan impeller system of claim 1, wherein, The wedge-shaped pad (4) has a surface connected to the boss (3) and a surface connected to the blade (2), the two surfaces forming a wedge angle (5); It has two sets of the wedge-shaped pads (4), and the number of the wedge-shaped pads (4) in each set is the same as the number of the blades (2); Each of the wedge-shaped pads (4) in each group has the same structure; The wedge-shaped pads (4) of different groups have different wedge angles (5), and the difference in wedge angles (5) is between 5 and 10 degrees.

3. The impeller profile adjustable fan impeller system of claim 1, wherein, Below the wedge-shaped pad (4), and on the side in front of the wedge-shaped pad (4), a first mounting through hole (6) is provided. The blade (2) and the boss (3) are provided with corresponding mounting through holes at the first mounting through hole (6) of the wedge-shaped pad (4). The wedge-shaped pad (4) is connected to a first connecting ring (7), which passes through the first mounting through hole (6) on all the wedge-shaped pads (4) in the circumference of the hub (1), as well as the corresponding mounting through holes on all the blades (2) and the boss (3), forming a rotational connection between the blades (2) and the boss (3). Below the wedge-shaped pad (4), and on the side behind the wedge-shaped pad (4), a first threaded through hole (8) is provided. The blade (2) and the boss (3) are provided with corresponding threaded through holes at the first threaded through hole (8) of the wedge-shaped pad (4). The bolt passes through the boss (3), the wedge-shaped pad (4) and the blade (2) in sequence to form a fixed connection between the boss (3), the wedge-shaped pad (4) and the blade (2).

4. The fan impeller system with adjustable impeller profile according to claim 1, characterized in that, The boss (3) extends radially outward along the hub (1) for a length of 10-15 cm.

5. The fan impeller system with adjustable impeller profile according to claim 1, characterized in that, The boss (3) and the hub (1) are integrally formed.

6. The fan impeller system with adjustable impeller profile according to claim 2, characterized in that, The installed wedge-shaped pad (4) has an arrangement structure that extends radially outward along the hub (1), and the wedge angle (5) is in the direction of radial outward extension along the hub (1), and the angle of the wedge angle (5) remains unchanged. The thickness of the wedge-shaped pad (4) sandwiched between the blade (2) and the boss (3) gradually increases along the radial outward direction.

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