A vibration-reducing and noise-reducing centrifugal wind wheel

Abstract

The present invention relates to the technical field of centrifugal wind wheels, and in particular to a vibration-reducing and noise-reducing centrifugal wind wheel, comprising a front disc, a rear disc and blades; the front disc is connected to one end of the blades, and a curved surface is provided on the side of the front disc away from the blades; the other end of the blades is connected to the rear disc; and a guide disc is also provided; the middle part of the rear disc is movably connected to the guide disc, and the guide disc is arranged in a conical shape, the conical surface of the guide disc is in an inward curved shape, a conical head is provided on the side of the guide disc close to the front disc, and a plurality of fixing parts are provided on the opposite sides of the guide disc and the front disc. The present invention guides the airflow through the conical surface on the guide disc, so as to avoid the airflow from colliding with the surface at a vertical angle when entering the centrifugal wind wheel, thereby causing the formation of turbulence, and the diameter of the opening in the middle part of the front disc is controlled to be smaller than the diameter of the guide disc, so that after the airflow enters, it avoids colliding with the conical surface of the guide disc at a nearly vertical angle, thereby reducing the formation of turbulence and reducing the swing frequency and amplitude of the airflow.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal wind wheels, and in particular to a vibration-reducing and noise-reducing centrifugal wind wheel. Background Art

[0002] A centrifugal fan wheel refers to a fan wheel that takes in air axially and discharges air radially, using centrifugal force (depending on the rotation speed and outer diameter) to do work to increase the air pressure.

[0003] At present, when air flows into the existing centrifugal wind wheel, it is easy for the air flow to collide with the surface of the centrifugal wind wheel, thus causing turbulence. At the same time, the faster the air flow enters, the greater the collision force will be. This will cause the turbulence to become more rapid, the air flow to swing more frequently and with greater amplitude, and the formed turbulence will continue to collide with the centrifugal wind wheel irregularly. This will not only cause wear on the centrifugal wind wheel, but also generate greater noise.

[0004] Moreover, when the airflow increases the output by doing work through centrifugal force, the airflow often collides with the centrifugal wind wheel more frequently due to the increase in the speed of the centrifugal wind wheel. That is, the airflow cannot pass quickly due to the unreasonable airflow volume and structural distribution of the centrifugal wind wheel, thereby increasing the internal pressure and friction. Summary of the invention

[0005] In order to overcome the disadvantages of the above-mentioned background problems, the present invention provides a vibration-reducing and noise-reducing centrifugal wind wheel.

[0006] Technical solution: A vibration-damping and noise-reducing centrifugal wind wheel, comprising a front disk, a rear disk and blades; the front disk is connected to one end of the blade, and a curved surface is provided on the side of the front disk away from the blade; the other end of the blade is connected to the rear disk; and a guide disk is also included; the middle part of the rear disk is movably connected to the guide disk, and the guide disk is arranged in a conical shape, the conical surface of the guide disk is inwardly curved, a conical head is provided on the side of the guide disk close to the front disk, and a plurality of fixing parts are provided on the opposite sides of the guide disk and the front disk.

[0007] In addition, it is particularly preferred that the blade has a variable cross-section from the front to the rear, and the ratio of the cross-sectional thickness to the chord length of the blade is 9%-16%.

[0008] In addition, it is particularly preferred that the angle of the front outlet angle of the blade is set at 0°-4°; the angle of the middle outlet angle of the blade is set at 21°-26°; and the angle of the rear outlet angle of the blade is set at 45°-49°.

[0009] Furthermore, it is particularly preferred that the rear portion of the blade is provided with a curved edge.

[0010] Furthermore, it is particularly preferred that the blades are provided with chamfered edges.

[0011] Furthermore, it is particularly preferred that the number of blades is 18-24.

[0012] In addition, it is particularly preferred that the guide plate is provided with a plurality of grooves extending from the center to the outer edge; and the guide plate is provided with a plurality of protrusions extending from the center to the outer edge.

[0013] In addition, it is particularly preferred that a plurality of annularly distributed balls are provided at the connection between the guide plate and the rear plate.

[0014] Furthermore, it is particularly preferred that a circular arc segment is provided on a side of the front disc close to the rear disc.

[0015] Furthermore, it is particularly preferred that the length of the circular arc segment is greater than the length of the blade front part.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. The present invention guides the airflow through the conical surface on the guide plate to avoid the airflow from colliding with the surface of the centrifugal wind wheel at a vertical angle when entering the centrifugal wind wheel, thereby preventing the formation of turbulence. In addition, the diameter of the opening in the middle of the front plate is controlled to be smaller than the diameter of the guide plate, so that after the airflow enters, it avoids colliding with the conical surface of the guide plate at a nearly vertical angle, thereby reducing the formation of turbulence and reducing the swing frequency and amplitude of the airflow.

[0018] 2. The present invention arranges blades with variable cross-sections so that the width of the channel for airflow between the same parts of every two adjacent blades varies according to the cross-section, so that it can effectively adapt to the amount of airflow passing between the same parts of every two adjacent blades, avoiding the problem of increasing friction between the airflow and the blades and generating greater noise due to the arrangement of a narrow airflow channel at the rear of the blades with a large airflow. In addition, the ratio of the cross-sectional thickness to the chord length of the blade is 38%-45%, thereby reducing the airflow passing through the area from detaching from the suction surface and increasing the flow guiding effect of the blade.

[0019] 3. The present invention can set the front outlet angle a of the blade to 0°-4°, the middle outlet angle b of the blade to 21°-26°, and the rear outlet angle c of the blade to 45°-49° according to the amount of airflow passing through, thereby adjusting the angle of the opening and reducing the problem of increased noise and vibration caused by different airflow amounts.

[0020] 4. The present invention reduces the friction force generated by the rotation of the rear disc and the guide disc by means of the ball bearings, thereby reducing the wear and vibration caused by the friction between the rear disc and the guide disc, increasing the service life and reducing the generation of noise.

[0021] 5. The present invention extends and guides the airflow through the arc segment, so that the airflow is further close to the guide plate, and then moves toward the blade direction under the action of centrifugal force, thereby reducing the problem of airflow turbulence. In addition, the smooth surface of the arc segment can reduce the collision of the airflow with it at a vertical angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention discloses a structural schematic diagram of a vibration-reducing and noise-reducing centrifugal wind wheel;

[0023] Figure 2 The present invention discloses a structural schematic diagram of a fixing part of a vibration-reducing and noise-reducing centrifugal wind wheel;

[0024] Figure 3 The present invention discloses a schematic structural diagram of a front disk of a vibration-reducing and noise-reducing centrifugal wind wheel;

[0025] Figure 4 The present invention discloses a schematic diagram of the combined structure of a rear plate and a guide plate of a vibration-reducing and noise-reducing centrifugal wind wheel;

[0026] Figure 5 A sectional view of the combined structure of a rear plate and a guide plate of a vibration-reducing and noise-reducing centrifugal wind wheel disclosed in the present invention;

[0027] Figure 6 The present invention discloses a structural schematic diagram of a blade of a vibration-reducing and noise-reducing centrifugal wind wheel;

[0028] Figure 7 A schematic diagram of blade outlet angles of blades of a vibration-reducing and noise-reducing centrifugal wind wheel disclosed in the present invention;

[0029] Figure 8 The present invention discloses a structural schematic bottom view of a vibration-reducing and noise-reducing centrifugal wind wheel.

[0030] In the figure: 1-front disc, 2-rear disc, 3-blades, 4-guide disc, 1001-arc surface, 1002-arc segment, 3001-chamfered edge, 3002-arc edge, 4001-conical head, 4002-groove, 4003-protrusion, 4004-ball, 4005-fixing part, a-front outlet angle, b-middle outlet angle, c-rear outlet angle. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention. Example 1

[0032] A vibration-reducing and noise-reducing centrifugal wind wheel, such as Figure 1-Figure 8 As shown, it includes a front disc 1, a rear disc 2 and a blade 3; one end of the blade 3 is welded to the front disc 1, and an opening for airflow to enter is provided in the middle of the front disc 1, and a curved surface 1001 is provided on the side of the front disc 1 away from the blade 3, so that the opening in the middle of the curved surface 1001 is set in a state of gradually shrinking from a large opening to a small opening; the other end of the blade 3 is welded to the rear disc 2;

[0033] It also includes a guide plate 4; the middle part of the rear plate 2 is rotatably connected to the guide plate 4, and the guide plate 4 is arranged in a conical shape, and the conical surface of the guide plate 4 is inwardly curved. A conical head 4001 is arranged on the side of the guide plate 4 close to the front plate 1, so that the airflow enters the front plate 1 and is guided toward the direction of the blades 3, thereby reducing the vertical collision between the airflow and the rear plate 2, and the turbulence caused by the mutual collision between the airflows. A plurality of fixing parts 4005 are arranged on the opposite sides of the guide plate 4 and the front plate 1, which are convenient for fixing the guide plate 4, ensuring its stability and reducing vibration, and the diameter of the opening in the middle of the front plate 1 is smaller than the diameter of the guide plate 4.

[0034] The blade 3 is arranged with a variable cross-section from the front to the rear. By changing the cross-sectional direction of different parts of the blade 3, it can effectively adapt to the amount of airflow passing through different parts, and by controlling the size of the above ratio, the guiding effect of the blade 3 is increased. In addition, the ratio of the cross-sectional thickness to the chord length of the blade 3 is 9%-16%. Controlling the thickness-chord ratio is used to improve the structural strength of the blade 3 or reduce airflow separation to improve aerodynamic efficiency, and an adaptive design is made according to the amount of airflow passing through different parts.

[0035] The angle of the front outlet angle a of the blade 3 is set to 0°-4°; the angle of the middle outlet angle b of the blade 3 is set to 21°-26°; the angle of the rear outlet angle c of the blade 3 is set to 45°-49°. The angle of the opening angle is adjusted according to the amount of airflow passing through to reduce the collision and friction between the airflow and the blade 3, thereby reducing the noise generated when the airflow passes through adjacent blades 3 and the vibration generated when the blade 3 rotates.

[0036] The rear portion of the blade 3 is provided with an arc edge 3002 to reduce the contact area between the airflow and the blade 3 .

[0037] The blade 3 is provided with a chamfered edge 3001 for adapting to the angle and direction of gas flow. At the same time, when the blade 3 contacts and leaves, the collision force generated by the contact is divided, thereby reducing the gas turbulence caused by the collision.

[0038] The number of blades 3 is 18-24, which optimizes the airflow distribution between two adjacent blades 3, reduces the collision between airflows and the formation of turbulence, ensures that the blades 3 capture the airflow and generate centrifugal force power, thereby improving the overall efficiency.

[0039] The present invention works specifically as follows:

[0040] The guide plate 4 is fixed on the required external device through the fixing part 4005 to avoid vibration of the guide plate 4 when the front plate 1, the rear plate 2 and the blades 3 are rotating. It should be noted that the inwardly curved conical surface on the guide plate 4 can guide the airflow toward the blades 3 when the airflow contacts the guide plate 4, thereby distinguishing from the prior art and avoiding collision at a vertical angle with the surface of the centrifugal wind wheel when the airflow enters the centrifugal wind wheel, thereby avoiding the formation of turbulence.

[0041] It should be noted that, as the conical surface of the guide plate 4 is closer to its outer edge, the angle with the airflow when entering is closer to 90°, so the above-mentioned incoming airflow will collide with the guide plate 4 at a nearly vertical angle, so that not only turbulence will be formed, but the greater impact at the vertical angle will also cause the turbulence to become more rapid, and the oscillation frequency and amplitude of the airflow will become larger, which will subsequently cause the turbulence to continuously and irregularly collide with the surfaces of the front plate 1, the rear plate 2 and the blades 3, thereby increasing the noise, and, when the speed increases and the work done by the centrifugal force is enhanced, the turbulent flow will also increase the friction with the blades 3 when passing through them, further increasing the noise, so that the diameter of the opening in the middle of the front plate 1 is smaller than the diameter of the guide plate 4, refer to Figure 8 As shown, after the airflow enters, it avoids colliding with the conical surface of the guide plate 4 at a nearly vertical angle, thereby reducing the formation of turbulence and lowering the swing frequency and amplitude of the airflow.

[0042] Furthermore, the arc surface 1001 set on the front disk 1 can collect the incoming airflow, and accelerate the airflow by gradually narrowing the large opening to a small opening. This is different from the prior art in that the collector needs to be installed and connected separately, which makes it easy for the airflow to penetrate into the gap at the installation connection when it enters, causing the airflow to be diverted, generating additional noise at the gap, and reducing the amount of airflow entering and the wind pressure output due to the work done by the centrifugal force.

[0043] Furthermore, the guide plate 4 is arranged in a conical shape, and a conical head 4001 is provided on the side of the guide plate 4 close to the front plate 1, so as to reduce the obstruction of the airflow by the guide plate 4. At the same time, when the airflow contacts the conical head 4001, the airflow can be divided and diverted to the outside and guided along the inner curved conical surface.

[0044] Furthermore, the airflow enters from the opening in the middle of the front disk 1 and moves toward the rear disk 2. After the centrifugal force does work, the airflow is subjected to a force toward the direction of the blade 3 and moves. In this way, the movement trajectory of the airflow is an arc and moves toward the rear of the blade 3, resulting in a large amount of airflow passing through the rear of the blade 3 and a small amount of airflow passing through the front of the blade 3. Therefore, by setting the blade 3 with a variable cross-section, the width of the channel for the airflow to pass between the same parts of every two adjacent blades 3 changes according to the change in the cross-section, so that it can effectively adapt to the amount of airflow passing through the same parts of every two adjacent blades 3, increase the guiding effect of the blade 3, avoid setting a narrow airflow channel at the rear of the blade 3 with a large airflow, which increases the friction between the airflow and the blade 3 and generates greater noise. Moreover, when the ratio of the cross-sectional thickness to the chord length of the blade 3 is 10%, the cross-sectional area of ​​the blade 3 becomes thinner, thereby reducing the airflow passing through the area from the suction surface and reducing the noise generated when the airflow hits the edge of the blade 3.

[0045] Furthermore, according to the amount of airflow passing through, the angle of the front outlet angle a of the blade 3 can be set to 4°, so as to reduce the tangential component of the airflow when leaving the blade 3. Since the amount of airflow passing through is small, the noise generated by the impact of the airflow can be reduced; the angle of the middle outlet angle b of the blade 3 is set to 26°, so as to balance the airflow guidance and aerodynamic efficiency, so as to reduce the partial airflow separation phenomenon in the middle of the medium airflow passing through, thereby reducing the noise level; the angle of the rear outlet angle c of the blade 3 is set to 49°, so as to increase the tangential component of the airflow leaving the blade 3 and improve the energy conversion efficiency of the airflow; according to the above-mentioned adjustable opening angle, when the airflow passes through the front of the blade 3 When the airflow passes through the rear part of the blade 3, its flow rate is large. If the outlet angle is increased, then when the blade 3 rotates and the speed increases, the side of the blade 3 will collide with the airflow more, resulting in more obvious noise caused by the collision of the airflow. When the airflow passes through the rear part of the blade 3, its flow rate is large. If the outlet angle is increased, then when the blade 3 generates centrifugal force at a high speed, there will be enough space between two adjacent blades 3 for the gas to pass quickly, thereby achieving optimal distribution of the airflow, avoiding high pressure inside the centrifugal impeller, reducing collision and friction between the airflow and the blade 3, and reducing the noise generated when the airflow passes through adjacent blades 3 and the vibration generated when the blade 3 rotates. Example 2

[0046] On the basis of Example 1, Figure 5 As shown, the guide plate 4 is provided with a plurality of grooves 4002 extending from the center to the outer edge; the guide plate 4 is provided with a plurality of protrusions 4003 extending from the center to the outer edge.

[0047] A plurality of annularly distributed balls 4004 are provided at the connection between the guide plate 4 and the rear plate 2 to reduce the friction force generated between the rear plate 2 and the guide plate 4 when the rear plate 2 rotates, thereby reducing wear and vibration.

[0048] The present invention works specifically as follows:

[0049] The plurality of grooves 4002 extending from the center to the outer edge and the protrusions 4003 extending from the center to the outer edge provided on the guide plate 4 can separate the airflow into a plurality of areas when the airflow contacts the guide plate 4, thereby reducing the collision between the airflows. In addition, due to the setting and fixation of the fixing portion 4005, the guide plate 4 can maintain a stationary state relative to the rear plate 2, thereby avoiding the problem of the airflow being turbulent due to the grooves 4002 and the protrusions 4003 caused by the rotation of the guide plate 4.

[0050] Furthermore, when the rear disc 2 is rotating, a plurality of annularly distributed balls 4004 are provided at the connection between the guide disc 4 and the rear disc 2, which can reduce the friction generated when the rear disc 2 and the guide disc 4 rotate, reduce the wear and vibration caused by the friction between the rear disc 2 and the guide disc 4, increase the service life, and reduce the generation of noise. At the same time, the connection between the rear disc 2 and the guide disc 4 is recessed inside the guide disc 4, which can prevent the airflow from penetrating from the two gaps at the connection, further reducing the generation of noise caused by part of the airflow entering the gap. Example 3

[0051] On the basis of Example 2, Figure 8 As shown, a circular arc segment 1002 is provided on the side of the front disc 1 close to the rear disc 2 to reduce the collision of the airflow with the surface of the front disc 1 at a vertical angle.

[0052] The length of the arc segment 1002 is greater than the length of the front portion of the blade 3 , thereby partially blocking the amount of airflow passing through the front portion of the blade 3 .

[0053] The present invention works specifically as follows:

[0054] When the airflow enters from the opening in the middle of the front disk 1, it will first be affected by the centrifugal force generated by the rotation of the blades 3 and move in that direction. At this time, in order to guide the airflow in a concentrated manner and avoid excessive turbulence before the airflow is guided, the airflow can be extended and guided by the arc segment 1002 set on the front disk 1, so that the airflow is further close to the guide disk 4 and then moved in the direction of the blades 3 under the action of centrifugal force, thereby reducing the turbulence of the airflow entering from the inner annular surface of the rear disk 2 due to the lack of guidance. In addition, the smooth surface of the arc segment 1002 can reduce the collision of the airflow at a vertical angle with it.

[0055] It should be noted that the length of the arc segment 1002 is greater than the length of the front part of the blade 3. While extending and guiding the flow, it can block part of the airflow from passing through the front part of the blade 3 due to the influence of centrifugal force, thereby reducing the amount of gas passing through the front part of the blade 3.

[0056] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention.

Claims

1. A vibration-reducing and noise-reducing centrifugal wind wheel, comprising a front disk (1), a rear disk (2) and blades (3); the front disk (1) is connected to one end of the blade (3), and a curved surface (1001) is provided on a side of the front disk (1) away from the blade (3); the other end of the blade (3) is connected to the rear disk (2); Features: The invention also comprises a guide plate (4); the guide plate (4) is movably connected to the middle of the rear plate (2); the guide plate (4) is arranged in a conical shape; the conical surface of the guide plate (4) is in an inwardly curved shape; a conical head (4001) is arranged on the side of the guide plate (4) close to the front plate (1); a plurality of fixing parts (4005) are arranged on the opposite sides of the guide plate (4) and the front plate (1); and the diameter of the opening in the middle of the front plate (1) is smaller than the diameter of the guide plate (4); the blades (3) are arranged in a variable cross-section from the front to the rear , and the ratio of the cross-sectional thickness and chord length of the blade (3) is 9%-16%; the angle of the front outlet angle (a) of the blade (3) is set at 0°-4°; the angle of the middle outlet angle (b) of the blade (3) is set at 21°-26°; the angle of the rear outlet angle (c) of the blade (3) is set at 45°-49°; the rear of the blade (3) is provided with an arc edge (3002); the blade (3) is provided with a chamfered edge (3001); the number of blades (3) is 18-24.

2. A vibration-reducing and noise-reducing centrifugal impeller according to claim 1, Features: The guide plate (4) is provided with a plurality of grooves (4002) extending from the center to the outer edge; the guide plate (4) is provided with a plurality of protrusions (4003) extending from the center to the outer edge.

3. A vibration-reducing and noise-reducing centrifugal impeller according to any one of claims 1 to 2, Features: A plurality of annularly distributed balls (4004) are provided at the connection between the guide plate (4) and the rear plate (2).

4. A vibration-reducing and noise-reducing centrifugal impeller according to claim 3, Features: A circular arc segment (1002) is provided on one side of the front disc (1) close to the rear disc (2).

5. A vibration-reducing and noise-reducing centrifugal impeller according to claim 4, Features: The length of the arc segment (1002) is greater than the length of the front portion of the blade (3).

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