A wind guide ventilation device used in cooperation with a three-dimensional flow blade fan

Abstract

This invention discloses an air guiding and ventilation device for use with a three-dimensional flow blade fan. The three-dimensional flow blade fan is housed within its ventilation housing, with at least one radially distributed ventilation unit. Each unit includes a volute guide wall and a corresponding air outlet. The volute guide wall extends spirally, with its curved end transitioning to the air outlet and its flat end connecting to the outlet of the adjacent unit. The edge outlet where the volute guide wall meets the air outlet is C-shaped. This C-shaped outlet matches the C-shaped airflow direction of the trailing edge of the three-dimensional flow blade fan blades, eliminating corner blockage and vortices in traditional rectangular outlets, allowing for smooth airflow transition. Combined with optimization of the volute's α-angle, β-angle, and outlet axial distance, the airflow is significantly increased, effectively improving static pressure efficiency, and the multi-channel distributed structure reduces vibration and noise.

Description

Technical Field

[0001] This invention relates to the field of fan ventilation technology, and specifically to a wind-guiding ventilation device used in conjunction with a three-dimensional flow blade fan. Background Technology

[0002] Three-dimensional flow blade fans, with their blades twisted in three spatial directions, can better adapt to the actual flow direction of airflow in the channel, thus effectively reducing flow losses. They are widely used in many ventilation and blower applications where high efficiency is required. In three-dimensional flow blade fans, the airflow at the impeller outlet is not a uniform straight flow, but rather exhibits a distinct "C"-shaped curved velocity distribution on the meridional plane projection, meaning the blade trailing edge profile is a "C"-shaped curve.

[0003] To further improve the static pressure efficiency of this type of fan, an air guide ventilation device is usually installed on the outside of the fan to collect the high-speed airflow discharged from the impeller and convert its kinetic energy into pressure energy through a diffuser channel. Currently, the four-channel air guide ventilation devices designed for three-dimensional flow fans on the market, although equipped with four air outlets to balance the radial force, mostly have simple rectangular channel shapes for the inner walls of their air outlets, and are not adapted to the "C"-shaped outlet flow field of three-dimensional flow blades.

[0004] There is a clear geometric mismatch between this rectangular outlet structure and the "C"-shaped airflow: when the airflow enters the rectangular channel from the "C"-shaped section of the impeller outlet, it is very easy to generate local blockage, eddies and flow separation in the corner area, resulting in a large flow loss, weakening the static pressure recovery capacity, causing the overall static pressure efficiency of the fan to be unable to be further improved, and causing additional aerodynamic noise.

[0005] Therefore, there is an urgent need for a wind-guiding and ventilation device that can fully adapt to the flow field characteristics at the outlet of a three-dimensional flow blade, especially matching the "C"-shaped direction of the blade trailing edge, in order to overcome the shortcomings of the existing technology.

[0006] It should be noted that the above description of the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of the present invention and facilitating understanding by those skilled in the art. It should not be assumed that the above technical solutions are known to those skilled in the art simply because they have been described in the background section of this invention. Summary of the Invention

[0007] To overcome the shortcomings of the prior art, the present invention aims to provide an air guiding and ventilation device for use with a three-dimensional flow blade fan.

[0008] To achieve the above and other related objectives, the technical solution provided by this invention is: a ventilation device for use with a three-dimensional flow blade fan, comprising a ventilation housing with a three-dimensional flow blade fan internally disposed therein, the three-dimensional flow blade fan being driven to rotate around a rotation axis C; the ventilation housing includes at least one radial ventilation unit in the circumferential direction of the three-dimensional flow blade fan, the radial ventilation unit including a volute guide wall and an air outlet corresponding to the volute guide wall; each of the volute guide walls extends spirally around the three-dimensional flow blade fan in the circumferential direction, and each of the air outlets is opened on the ventilation housing and evenly distributed around the rotation axis C; the curved end of the volute guide wall transitions to its corresponding air outlet, and the flat end of the volute guide wall is connected to the air outlet of its adjacent radial ventilation unit; the edge outlet of the volute guide wall connected to its corresponding air outlet is C-shaped.

[0009] This technical solution designs the edge outlet at the junction of the volute guide wall and the air outlet as a "C" shape, which can precisely match the "C" shaped airflow direction of the trailing edge of the three-dimensional flow blade fan blade. This allows the airflow to smoothly transition from the impeller outlet to the device outlet across the entire channel cross section, effectively avoiding corner blockage and eddies caused by abrupt changes in the rectangular cross section. This significantly increases the airflow volume and improves the static pressure efficiency of the fan.

[0010] Furthermore, along the airflow direction, the outlet distance B2 of the air-guiding ventilation device is 2 to 2.5 times the impeller outlet distance B1 of the three-dimensional flow blade fan. This technical solution, by limiting the ratio of the device outlet distance B2 to the impeller outlet distance B1 to a range of 2 to 2.5 times, provides sufficient and suitable diffusion length for the airflow, making the conversion of kinetic energy to pressure energy more complete and gradual. While avoiding excessively long flow channels that lead to increased frictional losses, it effectively suppresses airflow separation in the diffusion section, further optimizing static pressure recovery efficiency.

[0011] Furthermore, the outlet distance B2 of the air guiding and ventilation device is 2.1 times the impeller outlet distance B1 of the three-dimensional flow blade fan. In this technical solution, when the outlet distance B2 is 2.1 times the impeller outlet distance B1, for a common 450mm impeller stage, the flow channel diffusion characteristics and friction loss can reach a better balance point, resulting in a larger air volume and higher static pressure efficiency.

[0012] Furthermore, taking the intersection of the circle formed by the outer diameter of the impeller of the three-dimensional flow blade fan and the Y-axis of the rectangular coordinate system as point A, and drawing tangents L1 and L2 to the outer diameter of the volute spiral from point A, the angle between tangents L1 and L2 is the expansion angle α of the volute guide wall, which is 4° to 5°. This technical solution controls the initial expansion angle α of the volute guide wall within a relatively small range of 4° to 5°, enabling the cross-sectional area of ​​the spiral flow channel to increase very gradually along the circumference. This effectively prevents boundary layer separation of the airflow within the volute, reduces vortex losses caused by sudden expansion of the flow channel, and ensures efficient airflow within the volute.

[0013] Furthermore, the expansion angle α is 4.5°. In this technical solution, the expansion angle α of 4.5° is designed to give the volute a large diffusion capacity without causing flow separation, while also taking into account both aerodynamic performance and the compactness of the device structure.

[0014] Furthermore, the center of the circle formed by the outer diameter of the impeller of the three-dimensional flow blade fan is defined as point O, and the endpoint of the helix of the volute guide wall is defined as point B. A ray S is drawn from point O towards the direction of the helix, and a straight line L3 is obtained by connecting point O and point B. The angle between the ray S and the straight line L3 is angle β, which is 20° to 50°. In this technical solution, angle β limits the helix angle range of a single volute guide wall. An angle β of 20° to 50° ensures that the volute guide wall has a sufficiently long guiding distance to allow the airflow to fully turn and diffuse, while avoiding excessive radial dimensions of the device due to an excessively long helix, thus optimizing performance and volume.

[0015] Furthermore, the β angle is 45°. In this technical solution, when the β angle is 45°, under the multi-channel uniform distribution layout, the termination position of the volute guide wall and the outlet of the adjacent unit can form a better geometric connection relationship, making the entire inner flow channel circumferential transition smooth and the flow loss low.

[0016] Furthermore, a plane Q2 perpendicular to the rotation axis C is made on the C-shaped outlet surface of the three-dimensional flow blade fan. The planes at both ends of the three-dimensional flow blade fan along the axial direction are plane Q1 and plane Q3, respectively. Planes Q1 and Q3 are located on both sides of plane Q2 and are parallel to each other. The profile of the volute guide wall at planes Q1 and Q3 is consistent. This technical solution ensures that the profile of the volute guide wall at planes Q1 and Q3 is consistent, so that the volute guide wall at both ends of the fan along the axial direction has the same spiral profile. This ensures that the airflow is uniformly guided and constrained at both the starting end of the airflow entering the volute and the ending end of the airflow exiting the volute, avoiding axial pressure difference and flow distortion caused by the difference in profile at both ends of the axial direction. This ensures uniform and orderly discharge of airflow throughout the entire axial range and improves the overall efficiency of the device.

[0017] Furthermore, the plane at the flat end of the volute guide wall intersects the plane of its adjacent air outlet at a 90° angle. In this technical solution, the flat end of the volute guide wall intersects the plane of the adjacent air outlet at a 90° angle, forming a clear geometric boundary. This effectively blocks airflow crosstalk between two adjacent radial ventilation units in the junction area, making the flow in each channel independent and improving the effective flow capacity of each air outlet.

[0018] Furthermore, the curved end of the volute guide wall is provided with an outward flange. In this technical solution, the outward flange at the curved end of the volute guide wall enhances the structural rigidity and vibration resistance of the shell at the outlet, and also provides final directional guidance for the exhaust airflow, reducing airflow detachment and vortex size at the outlet edge, thereby further reducing outlet noise.

[0019] Furthermore, the number of radial ventilation units is four, and the four air outlets are evenly distributed around the rotation axis C, with an included angle of 90° between any two adjacent air outlets. This technical solution adopts a four-channel symmetrical and evenly distributed structure, which can balance the radial force generated by the airflow on the impeller and casing in the circumferential direction, reduce vibration and bearing load during fan operation, reduce structural noise, and improve operational stability.

[0020] Furthermore, the ventilation housing is an integral structure formed by casting or welding. In this technical solution, the integral structure reduces gaps and steps at the joints, has a smooth inner surface, can strictly guarantee the accuracy of the spiral line of the volute guide wall, and improves the overall sealing performance and service life of the device.

[0021] Due to the application of the above technical solution, the beneficial effects of this invention compared with the prior art are as follows: 1. This invention designs the edge where the air outlet meets the volute guide wall as a "C" shape that matches the trailing edge of the three-dimensional flow blade, which is in complete accordance with the main airflow direction of the impeller outlet, eliminating the vortex and blockage phenomenon in the corner area of ​​the traditional rectangular outlet, greatly reducing local flow losses, and achieving a dual improvement in air volume and static pressure efficiency.

[0022] 2. By optimizing the ratio of the outlet distance B2 of the air guiding and ventilation device to the impeller outlet distance B1, this invention constructs a flow channel with excellent diffusion performance within a limited radial space, making the conversion of kinetic energy to pressure energy more complete.

[0023] 3. By limiting the initial expansion angles α and β of the volute guide wall, the present invention makes the cross-sectional changes of the spiral flow channel gradual and orderly, effectively suppressing boundary layer separation and reducing flow resistance.

[0024] 4. The present invention adopts a design with consistent volute profiles at both ends of the axial end cover plate, combined with a radial multi-channel uniform distribution structure, which ensures the uniformity of airflow and smooth operation throughout the entire flow field, and reduces vibration and noise. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the air guiding and ventilation device of the present invention; Figure 2 This is a front view structural schematic diagram of the air guiding and ventilation device of the present invention; Figure 3 This is a side view of the air guiding and ventilation device of the present invention; Figure 4 This is a schematic AA cross-sectional view of the present invention; Figure 5 This is a schematic diagram of the spiral structure of the volute of the present invention; Figure 6 This is a schematic diagram of the structure of two spiral lines of the volute in the circumferential direction of the present invention; Figure 7 This is a schematic diagram of the structure of the volute helix of the present invention, in which three helices are arranged in a circumferential direction; Figure 8 This is a schematic diagram of the structure of the volute helix of the present invention, in which four helices are arranged in a circumferential direction; Figure 9 This is a schematic diagram of the four-channel outlet of the air-guiding ventilation device of the present invention; Figure 10 This is a schematic diagram showing the positions of planes Q1, Q2, and Q3 in this invention; Figure 11 This is a schematic diagram of the ventilation housing structure according to Embodiment 2 of the present invention; Figure 12 A performance comparison chart of the 450 impeller with and without the air guiding and ventilation device of this invention; In the attached diagrams above, 1 is the ventilation casing; 2 is the three-dimensional blade fan; 5 is the volute guide wall; 51 is the curved end; 52 is the flat end; 53 is the flange; 6 is the air outlet; and 61 is the edge of the C-shaped outlet. Detailed Implementation

[0026] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0027] It should be noted that in the description of this invention, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. These terms are used only for the convenience of describing the invention and for 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 invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. The terms "horizontal," "vertical," and "suspended," etc., do not indicate that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0030] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0031] Example 1: This embodiment provides an air guiding and ventilation device for use with a three-dimensional flow blade fan, the structure of which is as follows: Figure 1 , Figure 2 , Figure 4 and Figure 9As shown. The device includes a polygonal ventilation housing 1, with a three-dimensional flow blade fan 2 installed at the center of the ventilation housing 1. The impeller of the three-dimensional flow blade fan 2 rotates around the rotation axis C. The blades on the impeller are three-dimensional twisted blades, which are projected onto the meridional plane containing the rotation axis C. The trailing edge 71 of the blades forms a smooth C-shaped curve.

[0032] In the circumferential direction of the ventilation housing 1, there are four radial ventilation units integrally constructed. The four radial ventilation units are evenly arranged around the rotation axis C, and the geometric phase angle between two adjacent radial ventilation units is 90°. Each radial ventilation unit includes a volute guide wall 5 and an air outlet 6. The inner surface of the volute guide wall 5 forms an airflow diffusion guide surface. This wall surface gradually expands outward in a spiral shape from the starting end along the impeller rotation direction, and its curved end 51 smoothly transitions and terminates at the boundary of the corresponding air outlet 6. The flat end 52 of the volute guide wall 5 intersects and connects with the wall surface of the air outlet 6 of the next adjacent radial ventilation unit in the circumferential direction, thereby forming a ring-shaped multi-volute flow channel structure with the beginning and end connected.

[0033] The edge outlet where the curved end 51 of the volute guide wall 5 meets the air outlet 6, i.e. the starting contour line of the air outlet 6, is not a traditional straight line or rectangular edge, but rather a "C" shape, denoted as the C-shaped outlet edge 61. This C-shaped curve matches the projection curve of the blade trailing edge 71 of the three-dimensional flow fan 2 on the meridional plane in shape and size, so that the entire outlet flow channel can conform to the mainstream direction of discharge from the impeller in both axial and radial directions.

[0034] The dimensional design of this embodiment is as follows: Figure 3 As shown, the three-dimensional flow blade fan 2 uses an impeller with an outer diameter R2 of 450mm and an axial distance B1 from the impeller outlet of 167mm. The outlet distance B2 of the air guide ventilation device, i.e., the axial width of the air outlet 6, is designed to be 350mm. Calculations show that B2 / B1 = 350 / 167 ≈ 2.1, which falls within the preferred range of 2 to 2.5 times, with the optimal value of 2.1 times being taken.

[0035] The spiral profile of the volute guide wall 5 is determined by the following method: Figure 5As shown, point A is the intersection of the impeller outer diameter circle (450mm) and the Y-axis of the rectangular coordinate system. A tangent L1 to the spiral of the volute is drawn through point A, and simultaneously a tangent L2 to the impeller outer diameter circle is drawn. The acute angle between the two tangents is the expansion angle α of the volute guide wall 5 at this initial position. In this embodiment, α is selected as 4.5°. The spiral gradually expands according to this expansion angle, causing the internal flow area of ​​the volute to increase smoothly circumferentially. The center of the impeller outer diameter circle is further defined as point O, and the endpoint of the spiral is point B. A ray S is drawn from point O towards one side of the spiral. Ray S is usually selected as the positive Y-axis or a specific reference direction. Connecting point O and the endpoint B yields a straight line L3. The angle β between ray S and L3 is set to 45°. Under this β angle control, the volute guide wall 5 completes a full wrap around the curved end 51 outlet from near the planar end 52, and forms the corresponding air outlet 6 exactly after rotating 45° around the rotation axis C. Because the air-guiding ventilation device has four radial ventilation units that are evenly distributed, the spiral segments of the four volute guide walls 5 are connected end to end in sequence, and the airflow is guided in the ranges of 0° to 45°, 90° to 135°, 180° to 225°, and 270° to 315° respectively, and the overall envelope is smooth.

[0036] To ensure consistent airflow guidance at both axial ends, the axial profile of the volute guide wall 5 is specifically defined. Taking the location of the C-shaped outlet surface of the three-dimensional blade fan 2, a plane Q2 perpendicular to the rotation axis C is drawn. The two axial ends of the fan are defined as planes Q1 and Q3, respectively. Planes Q1 and Q3 are parallel to plane Q2 and distributed on either side of it. Figure 10 As shown. In this embodiment, the profiles (i.e., circumferential spiral contours) of the volute guide walls 5 at planes Q1 and Q3 are designed to be completely identical. In other words, at the cover plate positions at both ends of the fan axial direction, the volute guide walls 5 have the same spiral contour. This ensures that the airflow is subject to consistent guidance and constraint at both the starting end when entering the volute and the ending end when exiting the volute, avoiding axial pressure differences and flow distortion caused by differences in the profiles at both ends, and ensuring uniform discharge of airflow throughout the entire axial range.

[0037] At the connection between adjacent radial ventilation units, the plane of the planar end 52 of the volute guide wall 5 is perpendicular to the plane of the adjacent air outlet 6, i.e., they intersect at a 90° angle. This structure effectively cuts off pressure pulsation interference and airflow backflow between the two channels while ensuring the integrity of the casing. At the very end of the air outlet 6, the curved end 51 of the volute guide wall 5 is provided with an outward-facing flange 53. The flange 53 is arc-shaped and its width is about 1.5 to 2 times the wall thickness. It can improve the modal stiffness of the outlet edge and also play a slight deflection and guiding role for the outlet jet, reducing turbulence noise.

[0038] In this embodiment, the ventilation housing 1 is integrally formed from high-strength steel plate through molding and welding processes, and the inner surface is polished to ensure the continuity of the spiral line and low roughness.

[0039] The use of a ventilation system improved static pressure and static pressure efficiency. The test data is shown in the table below: Table 1: Test data for 450 impeller without air guide device

[0040] Table 2: Test Data for 450 Impeller with Air Guide Device

[0041] Example 2: This embodiment provides another alternative scheme based on Embodiment 1. The main difference from Embodiment 1 is that the number of radial ventilation units is three, such as... Figure 11 As shown, the included angle between adjacent air outlets 6 is 120°. To maintain a smooth diffusion characteristic within the longer spiral flow channel, the β angle corresponding to a single volute guide wall 5 is 45°, the same as in Example 1. The ratio of the outlet distance B2 of the air guide ventilation device to the impeller outlet distance B1 remains 2.2 times, and the expansion angle α is 5°. The edge outlet where the volute guide wall 5 connects to the air outlet 6 is also C-shaped, and fine-tuned according to the C-shaped curve of the blade trailing edge 71 of the specific blade. This three-channel scheme reduces the number of air outlets, and the flow rate and size of each outlet are correspondingly increased, making it suitable for applications requiring centralized exhaust or with fewer pipe interfaces.

[0042] The number of radial ventilation units can be two, three, four, etc., and the spiral of the volute is as follows: Figure 6 , Figure 7 , Figure 8 As shown.

[0043] Working principle: After the fan is started, the impeller of the three-dimensional blade fan 2 rotates at high speed around the rotation axis C, and the outside gas is drawn into the impeller from the axial direction. When the airflow flows through the flow channel formed by the three-dimensional twisted blades, it gains kinetic energy under the action of the blades and is discharged along the trailing edge 71 of the blades. Due to the three-dimensional twisted design of the blades, the velocity direction of the discharged airflow is not strictly radial, but rather distributed in a "C" shape on the meridional plane. That is, the airflow direction near the front and rear disc regions and the airflow direction in the middle region have a curved transition that conforms to the blade geometry.

[0044] After the high-speed airflow exits from the blade trailing edge 71, it immediately enters the annular diffuser and collection zone formed by multiple volute guide walls 5. The most crucial flow matching mechanism here lies in the fact that the initial section and the final outlet edge 61 of the volute guide wall 5 are both "C"-shaped, highly consistent with the C-shaped profile of the blade trailing edge 71. When the airflow encounters this C-shaped flow channel inlet immediately after leaving the impeller, the streamline of its mainstream is almost parallel to the flow channel wall, avoiding the strong impact and forced deflection caused by abrupt changes in cross-section as in traditional rectangular channels. Therefore, the airflow can fill the space formed by the entire volute guide wall 5 and the side covers extremely smoothly, greatly suppressing corner vortices and essentially eliminating airflow blockage, which is the key to achieving increased air volume.

[0045] Subsequently, the airflow flows outward along a spiral path under the guidance of the volute guide wall 5. The profile of the volute guide wall 5 starts from the planar end 52 and gradually moves away from the impeller outer diameter with a very small expansion angle α (4°~5°). According to Bernoulli's principle and diffuser flow theory, the slow increase in the cross-sectional area of ​​the flow channel causes the airflow velocity to decrease gradually and the pressure to rise gradually. The small expansion angle design ensures that the fluid in the boundary layer has sufficient kinetic energy to resist the adverse pressure gradient and prevent flow separation. If the expansion angle is too large, the boundary layer will thicken or even flow backward, generating separation vortices, resulting in significant energy loss and airflow pulsation.

[0046] As the airflow advances further along the spiral path, reaching the position corresponding to the spiral endpoint B of the volute guide wall 5, the airflow has completed its main diffusion and reversal, and smoothly exits the casing radially or at a certain angle through the C-shaped air outlet 6, supplying external air-consuming equipment or discharging into the atmosphere. Throughout the process, the ratio of B2 to B1 is designed to be approximately 2.1 times, and the entire axial flow channel length from the impeller outlet to the final outlet of the device is well matched with the diffusion area, resulting in a high pressure recovery coefficient.

[0047] For multiple radial ventilation units, their working principle is synchronized: each radial ventilation unit is responsible for collecting and diffused airflow within a certain angle circumferentially of the impeller. Since the air outlets 6 are evenly distributed and the planar end 52 of the volute guide wall 5 is perpendicularly separated from the plane of the adjacent outlet, the airflow in each unit is essentially non-interfering. This multi-channel symmetrical layout also geometrically balances the reaction forces exerted by the impeller exhaust airflow in all directions, greatly reducing the radial resultant force on the casing and shaft system, and lowering vibration and noise.

[0048] The consistent axial profile design is also significant in terms of working principle: planes Q1 and Q3 are the planes where the end caps of the fan are located along the axial direction, representing the starting and ending boundaries of the airflow entering the volute guide wall. If the circumferential profiles of these two volute guide walls 5 are inconsistent, the airflow will be subjected to different centrifugal forces and guiding constraints at both ends of the axial direction, generating axial pressure differences and secondary flows, thereby disrupting the uniformity of the "C"-shaped velocity distribution at the outlet. This invention ensures that the profiles at planes Q1 and Q3 are consistent, guaranteeing that the airflow experiences symmetrical diffusion rhythms at both ends of the axial direction, resulting in highly uniform airflow parameters along the axial height, and significantly reducing the airflow distortion at the device outlet.

[0049] This invention, through systematic aerodynamic geometry design, comprehensively adapts to the flow characteristics of three-dimensional flow blade fans, from airflow outlet matching, helical diffusion law, multi-channel combination to axial uniformity control, achieving high-efficiency, large-volume, and low-noise airflow guidance and ventilation effects. Its performance is comparable to... Figure 12 As shown.

[0050] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A ventilation device for use with a three-dimensional blade fan, characterized in that: The ventilation housing (1) includes a three-dimensional blade fan (2) internally mounted, which is driven to rotate around a rotation axis C. The ventilation housing (1) includes at least one radial ventilation unit in the circumferential direction of the three-dimensional blade fan (2). The radial ventilation unit includes a volute guide wall (5) and an air outlet (6) corresponding to the volute guide wall (5). Each of the volute guide walls (5) extends spirally around the three-dimensional blade fan (2) in the circumferential direction. Each of the air outlets (6) is opened on the ventilation housing (1) and is evenly distributed around the rotation axis C. The curved end (51) of the volute guide wall (5) transitions to its corresponding air outlet (6). The flat end (52) of the volute guide wall (5) is connected to the air outlet (6) of its adjacent radial ventilation unit. The edge outlet of the volute guide wall (5) connected to its corresponding air outlet (6) is "C" shaped (61).

2. The air deflection vent of claim 1, wherein: Along the airflow direction, the outlet distance B2 of the air guide ventilation device is 2 to 2.5 times the impeller outlet distance B1 of the three-dimensional flow blade fan (2).

3. The air deflection and ventilation device according to claim 2, characterized in that: The outlet distance B2 of the air guiding and ventilation device is 2.1 times the impeller outlet distance B1 of the three-dimensional flow blade fan (2).

4. The air deflection vent of claim 1, wherein: Point A is the intersection of the circle formed by the outer diameter of the impeller of the three-dimensional flow blade fan (2) and the Y-axis of the rectangular coordinate system. Point A is the starting point of the tangent line L1 of the spiral of the volute and the tangent line L2 of the outer diameter of the impeller. The angle formed by the tangent line L1 and the tangent line L2 is the expansion angle α of the volute guide wall (5). The angle of the expansion angle α is 4° to 5°.

5. The air deflection vent of claim 4, wherein: The expansion angle α is 4.5°.

6. The air deflection vent of claim 1, wherein: Define the center of the circle formed by the outer diameter of the impeller of the three-dimensional flow blade fan (2) as point O, and the end point of the spiral of the volute guide wall (5) as point B. Draw a ray S from point O toward the direction of the spiral, and connect point O and point B to obtain a straight line L3. The angle between the ray S and the straight line L3 is angle β, and the angle of angle β is 20° to 50°.

7. The air deflection vent of claim 6, wherein: The β angle is 45°.

8. The air deflection vent of claim 1, wherein: On the C-shaped outlet surface of the three-dimensional flow blade fan (2), a plane Q2 perpendicular to the rotation axis C is made. The planes at both ends of the axial direction of the three-dimensional flow blade fan (2) are plane Q1 and plane Q3, respectively. Planes Q1 and Q3 are located on both sides of plane Q2 and are parallel to each other. The volute guide wall (5) at plane Q1 and plane Q3 has the same profile.

9. The air deflection vent of claim 1, wherein: The plane at the flat end (52) of the volute guide wall (5) intersects the plane at a 90° angle with the plane at its adjacent air outlet (6).

10. The air deflection vent of claim 1, wherein: The curved end (51) of the volute guide wall (5) is provided with an outward flange (53).

Images