Fan balancing structure

Abstract

The utility model relates to the technical field of fans, in particular to a fan balancing structure, which is characterized in that counter weight is adjusted through the design of circular array balancing columns on a disc, so that when an impeller rotates, dynamic balance can be ensured, the balancing precision is improved, and through the design of an arc-shaped gradually-expanded blocking wall along the disc, the balancing precision is improved. The width of the blocking wall is gradually increased in the rotating direction of the impeller, airflow can be guided to be smoothly transited to the air guide cavity from the containing cavity, impact between the airflow and the wall face of the volute and generation of local vortexes are reduced, turbulence noise is lowered, the airflow is prevented from flowing backwards into the containing cavity, vibration caused by collision between the impeller and the airflow is avoided, and dynamic balance of the impeller is guaranteed. Meanwhile, the divergent structure is matched with the airflow diffusion rule under the centrifugal force effect of the impeller, energy loss is reduced, and the fan efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine technology, and in particular to a wind turbine balancing structure. Background Technology

[0002] Centrifugal fans are mainly composed of a volute, main shaft, impeller, bearing, transmission mechanism, and motor. The airflow of a centrifugal fan enters in a radial direction and then flows out in a spiral path under the action of centrifugal force. Therefore, its exhaust direction is basically perpendicular to the air inlet direction.

[0003] However, to ensure sufficient exhaust volume, the exhaust port of the volute is generally connected to the cavity where the impeller is installed. When the user requires a different exhaust direction, such as when the final exhaust direction is the same as the intake direction (see...), the exhaust port is usually connected to the cavity where the impeller is installed. Figure 1 This can easily cause vortices to form at the exhaust vent, resulting in backflow of air into the cavity, causing the impeller to vibrate and affect its dynamic balance, generating noise. At the same time, during impeller production, it is easy to make it difficult to achieve a uniform density distribution, thus making it impossible to guarantee dynamic balance during rotation. Utility Model Content

[0004] The purpose of this utility model is to provide a fan balancing structure, which addresses the shortcomings of the existing technology and aims to solve the technical problem that when the air inlet and outlet directions of the existing fan casing structure are the same, airflow backflow can easily generate vortices, affecting the dynamic balance of the impeller.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A fan balancing structure includes a volute with parallel air inlet and outlet directions and an impeller housed within the volute. The impeller includes a disc and multiple balancing columns arranged in a circular array on the disc. The balancing columns are used to adjust the counterweight balance of the impeller. The volute is provided with a connected receiving cavity and a guide cavity, as well as a gradually expanding baffle wall arranged along the arc of the disc and whose width gradually increases along the impeller rotation direction. The baffle wall is located between the receiving cavity and the guide cavity, and the disc is housed in the receiving cavity.

[0007] The present invention is further configured such that the impeller rotates counterclockwise so that the width of the blocking wall gradually increases from the receiving cavity toward the guide air cavity.

[0008] The present invention is further configured such that the barrier wall is connected to the inner wall of the air guide cavity, so that the lowest point of the barrier wall is greater than or equal to the center point of the air guide cavity.

[0009] The present invention is further configured such that: the volute includes a concave shell and a cover plate that covers the concave shell, and at least two fixing pieces are provided at the bottom of the cover plate.

[0010] The present invention is further configured such that: the concave shell is injection molded from high temperature resistant plastic, and the concave shell is also provided with a first reinforcing rib.

[0011] The present invention is further configured such that: the cover plate is also provided with an air inlet, the air inlet is coaxially arranged with the disc, and the concave shell is provided with an air outlet, the air inlet and the air outlet are arranged in the same direction.

[0012] The present invention is further configured such that an air outlet is connected to an air guide pipe.

[0013] The present invention is further configured such that: the impeller also includes a ring and multiple blades arranged in a circular array, the disc and the ring are spaced apart and parallel to each other, the two ends of the blades are connected to the disc and the ring, and there is a balance column between two adjacent blades.

[0014] The present invention is further provided with a second reinforcing rib on the side of the disk away from the blade.

[0015] Compared with the prior art, the beneficial effects of this application are as follows: This utility model adjusts the counterweight by using a circular array of balance columns on a disc, which ensures dynamic balance during impeller rotation and improves balance accuracy. Furthermore, the arc-shaped gradually expanding baffle wall design along the disc, with the width of the baffle wall gradually increasing along the impeller rotation direction, guides the airflow smoothly from the receiving cavity to the guide cavity, reducing the impact of airflow on the volute wall and the generation of local eddies, reducing turbulent noise, preventing airflow backflow into the receiving cavity, and avoiding vibration caused by impeller collision with airflow, thus ensuring the dynamic balance of the impeller. At the same time, the gradually expanding structure matches the airflow diffusion law under the centrifugal force of the impeller, reducing energy loss and improving fan efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the internal structure of a volute in existing technology;

[0018] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the concave shell structure in this utility model;

[0020] Figure 4 This is a schematic diagram of the cover plate in this utility model;

[0021] Figure 5 This is a schematic diagram of the impeller structure from one perspective in this utility model;

[0022] Figure 6 This is a schematic diagram of the impeller from another perspective in this utility model.

[0023] The details of the reference numerals used in the above figures are as follows:

[0024] 1-Volume, 11-Concave shell, 111-Accommodation cavity, 112-Air guide cavity, 113-Blocking wall, 114-First reinforcing rib, 115-Air outlet, 12-Cover plate, 121-Fixing plate, 122-Air inlet;

[0025] 2-Impeller, 21-Disc, 211-Second reinforcing rib, 22-Balance column, 23-Ring, 24-Blade;

[0026] 3-Air duct. Detailed Implementation

[0027] In the description of this application, the term "at least two" refers to two or more (including two), and similarly, "a plurality of" refers to two or more (including two). Technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary / secondary relationship of the indicated technical features. Terms such as "installation," "connection," and "linking" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] In the description of this application, the technical terms "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0029] In order to better understand the above-mentioned objectives, technical solutions and advantages of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings, so as to understand in detail how to solve the problems raised in the background art.

[0030] like Figures 2 to 6As shown, a fan balancing structure includes a volute 1 with parallel air inlet and outlet directions and an impeller 2 housed within the volute 1. The impeller 2 includes a disc 21 and a plurality of balancing columns 22 arranged in a circular array on the disc 21. The balancing columns 22 are used to adjust the counterweight balance of the impeller 2. The volute 1 is provided with a connected receiving cavity 111 and an air guide cavity 112, as well as a gradually expanding baffle wall 113 arranged in an arc along the disc 21 and whose width gradually increases along the rotation direction of the impeller 2. The baffle wall 113 is located between the receiving cavity 111 and the air guide cavity 112. The disc 21 is housed within the receiving cavity 111.

[0031] Through the above scheme, the circular array of multiple balance columns 22 on the disc 21 is designed to adjust the counterweight, so that the impeller 2 can be dynamically balanced when it is rotated at the factory, improving the balance accuracy. Furthermore, through the design of the arc-shaped gradually expanding baffle wall 113 along the disc 21, the width of the baffle wall 113 gradually increases along the rotation direction of the impeller 2, which can guide the airflow to smoothly transition from the receiving cavity 111 to the air guide cavity 112, reducing the impact of the airflow on the wall of the volute 1 and the generation of local vortices, reducing turbulence noise, preventing the airflow from flowing back into the receiving cavity 111, and avoiding the vibration caused by the collision of the airflow subsequently delivered to the impeller 2 with the vortex, thus ensuring the dynamic balance of the impeller 2. At the same time, the gradually expanding structure matches the airflow diffusion law under the centrifugal force of the impeller 2, which can reduce energy loss and improve the fan efficiency and exhaust volume.

[0032] In this embodiment, the balance column 22 is a cylindrical protruding structure. The balance column 22 is set on the side of the disc 21 where the impeller 2 is mounted, and there are 20 balance columns 22. The balance column 22 and the disc 21 are integrally injection molded. During molding, the initial height of each balance column 22 can be different to adjust the dynamic balance of the impeller 2. The balance column 22 undergoes multiple rounds of adjustment and testing during the production of the mold, thereby ensuring that the impeller 2 is dynamically balanced when it leaves the factory. This solves the problem that the density imbalance of the disc 21 is easy to cause during production, which affects the dynamic balance. In the prior art, the dynamic balance of the impeller 2 usually relies on external detachable counterweights. When the impeller 2 cannot be dynamically balanced, the counterweights need to be replaced or installed for adjustment. This requires the production of more than ten different weights of counterweights. The design of the detachable structure also increases the complexity of the production process. The installation or replacement of counterweights is complicated, resulting in high production and labor costs. The integrated design of the circular array balance column 22 and the disc 21 in this application significantly reduces the production cost. At the same time, there is a through hole in the center of the disc 21. At the center of impeller 2 is a hexagonal stud, inside which is a cylindrical metal fastener. The fastener has a threaded inner wall and a knurled, grooved outer wall to increase friction. The fastener is inserted into the hexagonal stud and tightened to secure it to impeller 2. A motor shaft is fixedly connected inside the fastener, passing through a through hole in disc 21. The shaft and fastener are threaded together clockwise; that is, counter-clockwise rotation of the shaft locks it in place, preventing the motor shaft from rotating counter-clockwise. The clockwise rotation loosens the impeller 2. The accommodating cavity 111 has a circular structure, and the air guide cavity 112 has a continuously curved spiral structure, which is similar in shape to the curved structure of the number 6. The front end of the air guide cavity 112 is tangent to the top of the accommodating cavity 111. At the same time, based on the arc-shaped curved design of the baffle wall 113, the air guide cavity 112 can gradually expand the guide gap from the top of the accommodating cavity 111 along the counterclockwise rotation direction of the impeller 2, so as to realize the axial uniform entry of the airflow into the air guide cavity 112, which can ensure the stable operation of the fan.

[0033] like Figure 2 and Figure 3 As shown, in one specific embodiment of the improvement, the impeller 2 rotates counterclockwise so that the width of the baffle wall 113 gradually increases from the receiving cavity 111 toward the guide cavity 112. Specifically, the width of the baffle wall 113 gradually increases counterclockwise from the top of the receiving cavity 111, that is, the baffle wall 113 protrudes relative to the disk 21 and its height gradually increases until it is coplanar with the front of the impeller 2. On the one hand, this can ensure the discharge volume of the airflow, and on the other hand, it can provide dynamic fault tolerance space for the airflow when the impeller 2 rotates at high speed, avoiding airflow compression and collision due to the air inlet of the guide cavity 112 being too small, thus ensuring the balance of the impeller 2's rotation.

[0034] like Figure 3As shown, in one improved embodiment, the baffle wall 113 is connected to the inner wall of the air guide cavity 112, so that the lowest point of the baffle wall 113 is greater than or equal to the center point of the air guide cavity 112. Specifically, in this embodiment, the lowest point of the baffle wall 113 is when the height of the baffle wall 113 is at its minimum when it is set in the concave shell 11, and the lowest point of the baffle wall 113 is on the same straight line as the center point of the air guide cavity 112. This provides sufficient inner wall height for the air guide cavity 112 to prevent airflow from flowing back into the receiving cavity 111, avoid collisions caused by airflow entering the receiving cavity 111, and ensure the balance of the impeller 2 rotation.

[0035] like Figure 2 and Figure 4 As shown, in one specific embodiment of the improvement, the volute 1 includes a concave shell 11 and a cover plate 12 that covers the concave shell 11. At least two fixing pieces 121 are provided at the bottom of the cover plate 12. Specifically, the cover plate 12 can be formed by stamping high-temperature resistant metal. The cover plate 12 and the concave shell 11 are provided with several corresponding screw holes, allowing the cover plate 12 and the concave shell 11 to be fixed by screws, enabling quick assembly and disassembly of the volute 1. Simultaneously, two fixing pieces 121 are provided, each with screw holes. The two fixing pieces 121 are respectively located on the left and right sides of the same straight line at the bottom of the cover plate 12, and are horizontally positioned while the cover plate 12 is vertically placed, making the cover plate 12 and the fixing pieces 121 perpendicular. This ensures the horizontal installation of the volute 1 and also allows the volute 1 to be fixed in the equipment by the fixing pieces 121, ensuring the stability and fixation of the volute 1.

[0036] like Figure 3 As shown, in one specific embodiment of the improvement, the concave shell 11 is injection molded from high-temperature resistant plastic, and the concave shell 11 is also provided with a first reinforcing rib 114. Specifically, since the cover plate 12 is made of metal, the structural strength is guaranteed, and the concave shell 11 can be firmly fixed to the cover plate 12, reducing production costs. The first reinforcing rib 114 consists of several protrusions distributed circumferentially along the center of the accommodating cavity 111, which strengthens the structural strength of the concave shell 11.

[0037] like Figures 2 to 4As shown, in one specific embodiment of the improvement, the cover plate 12 is also provided with an air inlet 122, which is coaxially arranged with the disc 21. The concave shell 11 is provided with an air outlet 115 so that the air inlet direction and the air outlet direction are in the same direction. Specifically, the air inlet 122 is circular and can be fitted with an air inlet pipe. The air inlet 122 is coaxially arranged with the impeller 2. The cover plate 12 covers the front of the concave shell 11, so that the air inlet direction is perpendicular to the rotation direction of the impeller 2. The air outlet 115 is connected to the air guide cavity 112 and is located on the back of the concave shell 11, so that the air inlet direction and the air outlet direction are both the front and back of the concave shell 11. Of course, in some embodiments, when the air outlet direction and the air inlet direction are parallel, they are opposite directions. The air outlet 115 is also located on the cover plate 12. The baffle wall 113 can also guide and block the airflow to prevent backflow.

[0038] like Figure 2 As shown, in one specific embodiment of the improvement, the air outlet 115 is connected to an air guide duct 3. Specifically, the air guide duct 3 is formed by rolling a metal sheet into a circular tube structure and then welding it. The air guide duct 3 is sealed to the concave shell 11. The air guide duct 3 can guide the airflow out of the equipment. The air guide duct 3 can also be configured as multiple interconnected structures, thereby changing the final discharge direction of the airflow.

[0039] like Figure 5 and Figure 6 As shown, in one specific embodiment of the improvement, the impeller 2 further includes a ring 23 and multiple blades 24 arranged in a circular array. The disc 21 and the ring 23 are spaced apart and parallel to each other. The two ends of the blades 24 are connected to the disc 21 and the ring 23. There is a balance column 22 between two adjacent blades 24. Specifically, there are 20 blades 24, all of which are arc-shaped. The 20 blades 24 are spaced 6-8 mm apart. The balance column 22 between two adjacent blades 24 is on the disc 21 within the interval. The disc 21, blades 24 and ring 23 are integrally injection molded from high-temperature resistant plastic material. The top surface of the blades 24 is fixedly connected to the bottom surface of the ring 23, and the bottom surface of the blades 24 is fixedly connected to the top surface of the disc 21. The blades 24 can output airflow under the drive of the motor.

[0040] like Figure 6 As shown, in one specific embodiment of the improvement, a second reinforcing rib 211 is provided on the side of the disk 21 away from the blade 24. Specifically, the second reinforcing rib 211 is provided on the bottom surface of the disk 21, and the second reinforcing rib 211 is provided along the through hole of the disk 21. The second reinforcing rib 211 has a structure in which a circular protrusion and multiple straight protrusions intersect, which can effectively enhance the structural strength and stability of the disk 21.

[0041] It is worth noting that the fan in this embodiment has a simple structure, is easy to manufacture and disassemble, and can be used in dryers to ensure the exhaust efficiency of the dryer and avoid backflow of air to generate noise, thus effectively improving the user experience. Of course, the fan can also be used in air purifiers, as well as for ventilation in kitchens, bathrooms, etc.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of this utility model, and the protection scope of this utility model is not limited to the above embodiments. All technical solutions within the scope of this utility model's concept are within the protection scope of this utility model. It should be pointed out that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A fan balancing structure, characterized in that, The device includes a volute with parallel air inlet and outlet directions and an impeller housed within the volute. The impeller includes a disc and multiple balance columns arranged in a circular array on the disc. The balance columns are used to adjust the counterweight balance of the impeller. The volute has a connected receiving cavity and a guide cavity, as well as a gradually expanding baffle wall arranged along the arc of the disc and whose width gradually increases along the rotation direction of the impeller. The baffle wall is located between the receiving cavity and the guide cavity. The disc is housed in the receiving cavity.

2. The fan balancing structure according to claim 1, characterized in that, The impeller rotates counterclockwise so that the width of the blocking wall gradually increases from the accommodating cavity toward the air guide cavity.

3. The fan balancing structure according to claim 2, characterized in that, The barrier wall is connected to the inner wall of the air guide cavity, such that the lowest point of the barrier wall is greater than or equal to the center point of the air guide cavity.

4. The fan balancing structure according to claim 1, characterized in that, The volute includes a concave shell and a cover plate that seals the concave shell, and the bottom of the cover plate is provided with at least two fixing pieces.

5. A fan balancing structure according to claim 4, characterized in that, The concave shell is injection molded from high-temperature resistant plastic, and the concave shell is also provided with a first reinforcing rib.

6. A fan balancing structure according to claim 5, characterized in that, The cover plate is also provided with an air inlet, which is coaxially arranged with the disc, and the concave shell is provided with an air outlet, which is arranged in the same direction.

7. A fan balancing structure according to claim 6, characterized in that, The air outlet is connected to an air duct.

8. A fan balancing structure according to claim 1, characterized in that, The impeller also includes a ring and multiple blades arranged in a circular array. The disc and the ring are spaced apart and parallel to each other. The two ends of the blades are connected to the disc and the ring. There is a balance column between two adjacent blades.

9. A fan balancing structure according to claim 8, characterized in that, A second reinforcing rib is provided on the side of the disk away from the blade.

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