A dust removal centrifugal fan with a three-dimensional impeller

Abstract

This invention relates to the centrifugal fan industry, and particularly to a dust-exhausting centrifugal fan with a three-dimensional flow impeller. The fan includes a volute, an impeller, and a collector. The collector is fixedly connected to the volute. A portion of the impeller extends into the volute, and another portion extends into the collector. The impeller includes a rear plate and a hub. A frustum-shaped central cone is mounted on the rear plate, which is fixedly mounted on the hub via the central cone. Multiple blades are arranged in a circular array around the rear plate. The blades are single-plate backward-inclined arc-shaped structures, and impeller channels are formed between adjacent blades. The central cone is coaxially arranged with the hub, and its diameter gradually increases from the direction away from the rear plate towards the rear plate. This invention, through the design of the three-dimensional flow impeller, enables the fan to have a superior static pressure ratio and a wider range of high-efficiency dust removal conditions. The superior static pressure ratio facilitates dust removal, reducing dust accumulation on the impeller, while the fan operates with lower noise.

Description

Technical Field

[0001] This invention relates to the centrifugal fan industry, and in particular to a dust removal centrifugal fan with a three-dimensional flow impeller. Background Technology

[0002] In recent years, with technological advancements and increasingly stringent environmental protection requirements, centrifugal fans for dust removal are demanding features such as environmental friendliness and energy efficiency, compact structure, flexible use, high pressure, stable operation, and high efficiency. For example, centrifugal fans used in industries such as wood processing, textiles, and mining to convey air mixtures containing wood chips, fibers, and dust require high pressure to promptly remove wood chips from wood processing, fibers and thread ends from textiles, and small fabric scraps. However, existing centrifugal fans generally suffer from low pressure and easy dust accumulation, leading to excessive dust buildup on the impeller's rear disc and the curved parts of the blades. This causes fan vibration during operation, affecting fan performance, which in turn impacts dust removal, the production environment, and reduces production efficiency.

[0003] Three-dimensional flow centrifugal fans are characterized by high efficiency, low noise, and a wide operating range. The three-dimensional flow impeller effectively reduces surface separation and the formation of large-aperture vortices at the blade tips, improving airflow efficiency and thus enhancing the overall energy efficiency of the fan. However, the manufacturing process of three-dimensional flow impellers is more complex than that of two-dimensional flow impellers, resulting in their limited use in ventilation fans. Three-dimensional flow impellers made of ordinary carbon steel are even rarer.

[0004] Therefore, whether the three-dimensional impeller can be applied to dust exhaust centrifugal fans to solve problems such as low pressure and easy dust accumulation has become a research direction. Summary of the Invention

[0005] The purpose of this invention is to provide a dust removal centrifugal fan with a three-dimensional flow impeller, which aims to solve the problems of low pressure and easy dust accumulation on the impeller that are common in existing dust removal centrifugal fans.

[0006] To achieve the above objectives, a dust removal centrifugal fan with a three-dimensional impeller includes a volute, an impeller, and a collector. The collector is fixedly connected to the volute, a portion of the impeller extends into the volute, and another portion of the impeller extends into the collector.

[0007] The impeller includes a rear plate and a hub. The rear plate has a central cone with a frustum-shaped structure. The rear plate is fixedly mounted on the hub through the central cone. Multiple blades are arranged in an array around the rear plate. The blades are single-plate backward-inclined arc structures, and impeller channels are formed between adjacent blades.

[0008] The central cone is coaxially arranged with the wheel hub, and the diameter of the central cone gradually increases from the direction away from the rear disc to the direction closer to the rear disc;

[0009] On the projection surface of the rear disc, the blade includes a first arc segment tangentially connected to the hub and a second arc segment away from the hub. The radius R2 of the first arc segment is 105.2mm-106.8mm and the arc length is 55.6mm-56.4mm. The radius R1 of the second arc segment is 142mm-144mm and the arc length is 85.5mm-86.5mm. The inlet angle ∠1 of the blade during installation is 65.1°-66.9°, and the outlet angle ∠2 of the blade during installation is 48.2°-49.5°.

[0010] The diameter φ1 of the outer circumference formed by the outer ends of all the blades of the impeller is 300mm;

[0011] There are 8 leaves.

[0012] Furthermore, the impeller is cut by a plane passing through the central axis of the impeller. In the cross section, the blade includes a first straight segment, an arc segment, an inclined straight segment and a second straight segment connected in sequence. The arc segment is tangent to both the first straight segment and the inclined straight segment.

[0013] The blade portion corresponding to the first straight segment forms the inlet guide vane of the blade, while the blade portions corresponding to the arc segment, the inclined straight segment, and the second straight segment form the outlet guide vane of the blade.

[0014] The length L1 of the first straight segment is 51mm-53mm, the radius R3 of the arc segment is 4.8mm-5.2mm and the arc length is 4.5mm-5.5mm, the length L3 of the second straight segment is 29.5mm-30.5mm, the angle ∠3 between the inclined straight segment and the second straight segment is 121°-123°, and the vertical distance L2 between the two endpoints of the inclined straight segment is 33.2mm-34.8mm in the direction parallel to the central axis of the wheel hub.

[0015] The upper base diameter φ3 of the central cone is 58mm-60mm, and the lower base diameter φ4 of the central cone is 201mm-205mm;

[0016] The circumference φ2 formed by the outermost ends of the inlet guide vanes of all blades is 185mm-187mm.

[0017] Furthermore, R2 is 106mm with an arc length of 56mm, R1 is 143mm with an arc length of 86mm, ∠1 is 66°, ∠2 is 49°, L1 is 52mm, R3 is 5mm with an arc length of 5mm, L3 is 30mm, ∠3 is 121.97°, L2 is 34mm, φ3 is 59mm, φ4 is 203mm, and φ2 is 186mm.

[0018] Furthermore, the collector includes a first connecting part, an air guide section, an air expansion section and a second connecting part connected in sequence. The air expansion section is fixedly connected to the volute through the second connecting part. The first connecting part is annular and has an air inlet formed on its inner circumference. The second connecting part is annular and has an air guide outlet formed on its inner circumference.

[0019] The collector is cut off by a plane passing through its central axis. On the cross-section, in the direction from the air inlet to the air guide, the air guide section is set as a cylindrical structure with a rectangular cross-section, and the air expansion section forms a gradually expanding frustum-shaped structure.

[0020] Furthermore, the diameter φ5 of the air inlet is 189mm-191mm, the length L4 of the air guide section is 102mm-104mm, the vertical distance L5 between the two ends of the air expansion section is 32.5mm-33.5mm in the direction parallel to the central axis of the collector, and the angle ∠4 between the air expansion section and the second connecting part is 27°-28°.

[0021] The distance L12 between the air inlet and the impeller is 55.6mm-56.5mm.

[0022] Furthermore, φ5 is 190mm, L4 is 103mm, L5 is 33mm, and ∠4 is 27.57°;

[0023] The distance L12 between the air inlet and the impeller is 56mm.

[0024] Furthermore, the profile of the volute includes a first diffuser straight segment, a volute tongue segment, a first arc segment, a second arc segment, a third arc segment, a fourth arc segment, and a second diffuser straight segment connected tangentially in sequence; the first diffuser straight segment and the second diffuser straight segment enclose and form an air outlet, and the first arc segment, the second arc segment, the third arc segment, and the fourth arc segment are not concentric;

[0025] Establish a rectangular coordinate system with the center of the impeller as the origin. When the first diffuser straight segment is located in the second quadrant, the coordinates of the center O1 of the first arc segment are (19, 18.5), the radius R5 is 172mm-174mm, and the arc length is 133.4mm-136.6mm. The coordinates of the center O4 of the second arc segment are (19, -18.5), the radius R6 is 209.7mm-212.3mm, and the arc length is 329mm-33mm. The center O3 of the third arc segment is (-19, -18.5), the radius R7 is 247.4mm-250.6mm, and the arc length is 387.8mm-392.3mm. The center O2 of the fourth arc segment is (-19, 18.5), the radius R8 is 284mm-288mm, and the arc length is 446.2mm-452mm. The first and second diffuser lines are both set perpendicular to the air outlet.

[0026] Furthermore, the air outlet includes an air outlet diffuser section. On the side cross-sectional view of the volute, the air outlet diffuser section has a trapezoidal structure. The upper base L10 of the trapezoid is 54.5mm-55.5mm, the lower base L9 is 94mm-96mm, the height L11 is 101.5mm-104.5mm, and the interior angle ∠6 is 78°-79.5°.

[0027] The width L9 of the air outlet is 94mm-96mm, and the height L8 is 173.8mm-176.5mm;

[0028] The radius R4 of the volute tongue segment is 7.5mm-8.5mm and the arc length is 18.1mm-19.9mm. The length L6 of the first diffuser straight segment is 138mm-140mm and the length L7 of the second diffuser straight segment is 265mm-270mm. A tangent line is drawn to the volute tongue segment with the tangent point between the volute tongue segment and the first arc segment as the tangent point. The angle ∠5 between this tangent line and the first diffuser straight segment is 45°-45.8°.

[0029] Furthermore, it also includes a motor and a base. The motor is connected to the impeller via a motor shaft, and both the volute and the motor are fixedly mounted on the base.

[0030] L10 is 55mm, L9 is 95mm, L11 is 103mm, ∠6 is 78.69°, L9 is 95mm, L8 is 175mm, R4 is 8mm and the arc length is 19mm, L6 is 139mm, L7 is 267mm, and ∠5 is 45.37°.

[0031] The present invention provides a dust removal centrifugal fan with a three-dimensional impeller:

[0032] (1) A three-dimensional flow impeller was designed. By designing a central cone on the rear plate and backward-inclined blades, the impeller channel is smoother and provides higher pressure. It is applied to the exhaust ventilation of wood chips, fibers and thread ends, small cloth scraps and other fine materials in wood processing, textile and garment manufacturing. This makes it difficult for dust to accumulate on the impeller, solving the problem of dust accumulation in conventional dust removal centrifugal fan impellers, optimizing the production environment and improving production efficiency. At the same time, the central cone rear plate and the mold-pressed blade design use low-cost ordinary carbon steel as raw material to make the inlet guide vane, central cone and outlet guide vane, which effectively reduces the manufacturing cost of the three-dimensional flow impeller and improves the manufacturing efficiency.

[0033] (2) Reasonably design the inlet and outlet angles, number of blades, blade profile, and central cone of the rear plate during blade installation so that the impeller can effectively avoid flow separation, reduce flow loss and control the velocity distribution of the internal fluid to obtain the best flow state and conveying efficiency, thereby improving the total pressure and efficiency of the fan.

[0034] (3) From the air inlet to the air guide, the collector adopts a cylindrical air guide section and a gradually expanding frustum-shaped air expansion section. The air guide section and the air expansion section are matched with the inlet guide vane design, so that the air pressure loss is small, the airflow can enter the impeller channel more smoothly, and the vortex area formed by the airflow after entering the impeller is smaller, which improves the air intake effect of the fan and further improves the efficiency of the fan.

[0035] (4) The circular arc transition structure of the logarithmic spiral volute profile ensures smooth and efficient airflow within the volute, reduces airflow impact and energy loss, thereby improving fan efficiency. Through the matching design of the volute outlet and the volute tongue section, the outward expansion of the outlet airflow angle enables the kinetic energy of the airflow at the outlet to be converted into static pressure energy, which helps to reduce fan noise and further improve total pressure and fan efficiency. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of the present invention;

[0037] Figure 2 This is a schematic diagram of the profile of the volute.

[0038] Figure 3 This is a schematic side sectional view of the volute.

[0039] Figure 4 This is a schematic diagram of the impeller structure;

[0040] Figure 5 This is a schematic diagram of the side view of the impeller.

[0041] Figure 6 This is a schematic diagram of the three-dimensional structure of the impeller;

[0042] Figure 7 This is a diagram showing the unfolded shape of the blade.

[0043] Figure 8 This is a side sectional view of the collector;

[0044] Figure 9 This is a performance curve diagram of the present invention.

[0045] Explanation of reference numerals in the attached figures:

[0046] 1. Volute; 11. First diffuser straight section; 12. Volute tongue section; 13. First arc section; 14. Second arc section; 15. Third arc section; 16. Fourth arc section; 17. Second diffuser straight section; 18. Air outlet; 181. Air outlet diffuser section;

[0047] Impeller 2; Blade 21; First straight section 211; Arc section 212; Inclined straight section 213; Second straight section 214; Impeller channel 22; Rear plate 23; Central cone 231; Hub 24;

[0048] Collector 3; First connecting part 31; Air guide section 32; Air expansion section 33; Second connecting part 34; Air inlet 35; Air guide outlet 36;

[0049] 4. Motor; 5. Base. Detailed Implementation

[0050] The present invention will be described in detail below with reference to specific embodiments.

[0051] In this invention, unless otherwise explicitly specified and limited, terms such as "set in," "connected," and "linked" 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 direct connection or a connection through one or more intermediate media. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The directional terms appearing in this invention are for the purpose of better describing the characteristics of the features and the relationships between them. It should be understood that when the orientation of this invention changes, the orientation of the characteristics of the features and the relationships between them also changes accordingly. Therefore, directional terms do not constitute an absolute spatial limitation on the characteristics of the features and the relationships between them, but only a relative limitation.

[0052] The structural parameters used in this invention are only for illustrating the technical solution of this invention. That is, based on the basic structural parameters of this invention, reasonable proportional scaling can be performed in actual production (for example, when the diameter of the outer circumference circle formed by the outer ends of all the blades of the impeller is 300mm, it can be scaled by 0.1-30 times, etc.). Such reasonable proportional scaling also falls within the protection scope of this invention.

[0053] Please see Figure 1-9 A dust removal centrifugal fan with a three-dimensional impeller includes a volute 1, an impeller 2 and a collector 3. The collector 3 is fixedly connected to the volute 1. A part of the impeller 2 extends into the volute 1 and another part of the impeller 2 extends into the collector 3.

[0054] The impeller 2 includes a rear plate 23 and a hub 24. The rear plate 23 is provided with a central cone 231 with a frustum structure. The rear plate 23 is fixedly mounted on the hub 24 through the central cone 231. Multiple blades 21 are arranged in a circle around the rear plate 23. The blades 21 are single-plate backward-inclined arc structure, and impeller channels 22 are formed between adjacent blades 21.

[0055] The central cone 231 is coaxially arranged with the hub 24, and the diameter of the central cone 231 gradually increases from the direction away from the rear disc 23 to the direction closer to the rear disc 23;

[0056] On the projection surface of the rear disc, the blade includes a first arc segment tangentially connected to the hub and a second arc segment away from the hub. The radius R2 of the first arc segment is 105.2mm-106.8mm and the arc length is 55.6mm-56.4mm. The radius R1 of the second arc segment is 142mm-144mm and the arc length is 85.5mm-86.5mm. The inlet angle ∠1 of the blade during installation is 65.1°-66.9°, and the outlet angle ∠2 of the blade during installation is 48.2°-49.5°. Preferably, R2 is 106mm and the arc length is 56mm, R1 is 143mm and the arc length is 86mm, ∠1 is 66°, and ∠2 is 49°.

[0057] The diameter φ1 of the outer circumference formed by the outer ends of all the blades of the impeller is 300mm;

[0058] There are 8 leaves.

[0059] In this embodiment, the impeller is cut by a plane passing through the central axis of the impeller. On the cross section, the blade includes a first straight segment, an arc segment, an inclined straight segment and a second straight segment connected in sequence. The arc segment is tangent to both the first straight segment and the inclined straight segment.

[0060] The blade portion corresponding to the first straight segment forms the inlet guide vane of the blade, while the blade portions corresponding to the arc segment, the inclined straight segment, and the second straight segment form the outlet guide vane of the blade.

[0061] The length L1 of the first straight segment is 51mm-53mm, the radius R3 of the arc segment is 4.8mm-5.2mm and the arc length is 4.5mm-5.5mm, the length L3 of the second straight segment is 29.5mm-30.5mm, the included angle ∠3 between the inclined straight segment and the second straight segment is 121°-123°, and the vertical distance L2 between the two endpoints of the inclined straight segment in the direction parallel to the central axis of the hub is 33.2mm-34.8mm; preferably, L1 is 52mm, R3 is 5mm and the arc length is 5mm, L3 is 30mm, ∠3 is 121.97°, and L2 is 34mm;

[0062] The upper base diameter φ3 of the central cone is 58mm-60mm, and the lower base diameter φ4 of the central cone is 201mm-205mm; preferably, φ3 is 59mm and φ4 is 203mm.

[0063] The circumference diameter φ2 formed by the outermost ends of the inlet guide vanes of all blades is 185mm-187mm. Preferably, φ2 is 186mm.

[0064] Through the above technical solution, three fluid elements were designed: inlet guide vane, central cone 231 and outlet guide vane. (1) A three-dimensional flow impeller 2 was designed. By designing the central cone 231 on the rear plate 23 and designing the backward-inclined blades 21, the impeller channel 22 is made smoother and provides higher pressure. It is applied to the exhaust ventilation of wood chips, fibers and thread ends, small cloth scraps and other fine materials in wood processing, textile and garment manufacturing, etc., so that dust is not easy to accumulate on the impeller 2. It solves the disadvantage of the impeller 2 of conventional dust exhaust centrifugal fan being easy to accumulate dust, optimizes the production environment and improves production efficiency. At the same time, the central cone The design of the 231 type rear disc 23 and the mold-pressed blade 21 uses low-cost ordinary carbon steel as raw material to make the inlet guide vane, central cone 231 and outlet guide vane, which effectively reduces the manufacturing cost of the three-dimensional flow impeller 2 and improves the manufacturing efficiency; (2) Reasonably design the inlet and outlet angles, number of blades 21, blade profile, central cone 231 of the rear disc 23 and other elements when the blades 21 are installed, so that the impeller 2 can effectively avoid flow separation, reduce flow loss and control the velocity distribution of the internal fluid, so as to obtain the best flow state and conveying efficiency, thereby improving the total pressure and efficiency of the fan.

[0065] In this embodiment, the collector 3 includes a first connecting part 31, an air guide section 32, an air expansion section 33, and a second connecting part 34 connected in sequence. The air expansion section 33 is fixedly connected to the volute 1 through the second connecting part 34. The first connecting part 31 is annular and has an air inlet 35 formed on its inner circumference. The second connecting part 34 is annular and has an air guide 36 formed on its inner circumference.

[0066] The collector 3 is cut off by a plane passing through the central axis of the collector 3. On the cross section and in the direction from the air inlet 35 to the air guide 36, the air guide section 32 is set as a cylindrical structure with a rectangular cross section, and the air expansion section 33 forms a gradually expanding frustum structure.

[0067] In this embodiment, the diameter φ5 of the air inlet 35 is 189mm-191mm, the length L4 of the air guide section 32 is 102mm-104mm, the vertical distance L5 between the two endpoints of the air expansion section 33 in the direction parallel to the central axis of the collector 3 is 32.5mm-33.5mm, and the angle ∠4 between the air expansion section 33 and the second connecting part 34 is 27°-28°; preferably, φ5 is 190mm, L4 is 103mm, L5 is 33mm, and ∠4 is 27.57°;

[0068] The distance L12 between the air inlet 35 and the impeller 2 is 55.6mm-56.5mm. Preferably, L12 is 56mm.

[0069] Through the above technical solution, from the air inlet 35 to the air guide 36, the collector 3 adopts a cylindrical air guide section 32 and a gradually expanding frustum-shaped air expansion section 33. The air guide section 32 and the air expansion section 33 are matched with the inlet guide vane design, which makes the airflow pressure loss small, the airflow can enter the impeller 2 channel more smoothly, and the vortex area formed by the airflow after entering the impeller 2 is smaller, which improves the air intake effect of the fan and further improves the fan efficiency.

[0070] In this embodiment, the profile of the volute 1 includes a first diffuser straight segment 11, a volute tongue segment 12, a first arc segment 13, a second arc segment 14, a third arc segment 15, a fourth arc segment 16, and a second diffuser straight segment 17 connected tangentially in sequence; the first diffuser straight segment 11 and the second diffuser straight segment 17 enclose and form an air outlet 18, and the first arc segment 13, the second arc segment 14, the third arc segment 15, and the fourth arc segment 16 are not concentric;

[0071] A rectangular coordinate system is established with the center of impeller 2 as the origin. When the first diffuser straight segment 11 is located in the second quadrant, the coordinates of the center O1 of the first arc segment 13 are (19, 18.5), the radius R5 is 172mm-174mm, and the arc length is 133.4mm-136.6mm. The coordinates of the center O4 of the second arc segment 14 are (19, -18.5), the radius R6 is 209.7mm-212.3mm, and the arc length is 329mm-333mm. The center O3 of the third arc segment 15 is (-19, -18.5), the radius R7 is 247.4mm-250.6mm, and the arc length is 387.8mm-392.3mm. The center O2 of the fourth arc segment 16 is (-19, 18.5), the radius R8 is 284mm-288mm, and the arc length is 446.2mm-452mm. The first diffuser line 11 and the second diffuser line segment 17 are both set perpendicular to the air outlet 18.

[0072] Preferably, a rectangular coordinate system is established with the center of the impeller 2 as the origin. When the first diffuser straight line segment 11 is located in the second quadrant, the center O1 of the first arc segment 13 has coordinates of (19, 18.5), radius R5 is 173mm and arc length is 135mm, the center O4 of the second arc segment 14 has coordinates of (19, -18.5), radius R6 is 211mm and arc length is 331mm, the center O3 of the third arc segment 15 has coordinates of (-19, -18.5), radius R7 is 249mm and arc length is 390mm, and the center O2 of the fourth arc segment 16 has coordinates of (-19, 18.5), radius R8 is 286mm and arc length is 449mm.

[0073] In this embodiment, the air outlet 18 includes an air outlet diffuser section 181. On the side cross-sectional view of the volute 1, the air outlet diffuser section 181 has a trapezoidal structure. The upper base L10 of the trapezoid is 54.5mm-55.5mm, the lower base L9 is 94mm-96mm, the height L11 is 101.5mm-104.5mm, and the interior angle ∠6 is 78°-79.5°. Preferably, L10 is 55mm, L9 is 95mm, L11 is 103mm, and ∠6 is 78.69°.

[0074] The width L9 of the air outlet 18 is 94mm-96mm and the height L8 is 173.8mm-176.5mm; preferably, L9 is 95mm and L8 is 175mm.

[0075] The radius R4 of the volute tongue segment 12 is 7.5mm-8.5mm and the arc length is 18.1mm-19.9mm. The length L6 of the first diffuser straight segment 11 is 138mm-140mm, and the length L7 of the second diffuser straight segment 17 is 265mm-270mm. A tangent line is drawn to the volute tongue segment 12 at the tangent point between it and the first arc segment 13. The angle ∠5 between this tangent line and the first diffuser straight segment 11 is 45°-45.8°. Preferably, R4 is 8mm and the arc length is 19mm, L6 is 139mm, L7 is 267mm, and ∠5 is 45.37°.

[0076] In this embodiment, a motor 4 and a base 5 are also included. The motor 4 is connected to the impeller 2 via a motor shaft. Both the volute 1 and the motor 4 are fixedly mounted on the base 5.

[0077] Through the above technical solution, the circular arc transition structure of the logarithmic spiral volute 1 ensures smooth and efficient airflow within the volute 1, reduces airflow impact and energy loss, thereby improving fan efficiency. Through the matching design of the air outlet 18 and the volute tongue section 12 of the volute 1, the outward-expanding outlet airflow angle enables part of the kinetic energy of the airflow at the air outlet 18 to be converted into static pressure energy, which helps to reduce fan noise and further improve total pressure and fan efficiency.

[0078] To verify this embodiment, based on the preferred structural parameters provided in this embodiment, a dust removal centrifugal fan with a three-dimensional flow impeller was manufactured with a diameter of 300 mm for the impeller 2 (i.e., the diameter of the outer circumference formed by the outer ends of all the blades 21 of the impeller 2). The test results were converted to conditions of atmospheric pressure of 101325 Pa, atmospheric temperature of 20 °C, fan speed of 2900 r / min, and medium density of 1.2 kg / m³. 3 The test data under the test conditions are shown in Table 1. Figure 9The performance curves shown represent the volumetric flow rate (qvsglGu), A-weighted sound level (LAGu), fan efficiency (ηr), impeller power (PrGu), total pressure (pFGu), and static pressure (psFGu).

[0079] Table 1

[0080]

[0081] The test data and performance curves show that the optimal fan efficiency is 51.046%, at which point the volumetric flow rate is 679.32 m³ / h. 3 The total pressure was 919.45 Pa, the static pressure was 842.41 Pa, the static pressure ratio was 91.621%, and the A-weighted sound level was 73.707 dB. As the impeller power gradually increased to reach optimal fan efficiency, the total pressure remained between 919.45 Pa and 1127.6 Pa, the static pressure remained between 842.41 Pa and 1116.3 Pa, the static pressure ratio ranged from 91.621% to 98.998%, and the A-weighted sound level ranged from 72.990 dB to 73.707 dB.

[0082] The results above show that the dust removal centrifugal fan with a three-dimensional flow impeller of the present invention has a better static pressure ratio and a wider range of high-efficiency dust removal conditions through the design of the three-dimensional flow impeller. The better static pressure ratio is conducive to dust removal to reduce the accumulation of dust on the impeller, and the fan has lower noise when it is working.

[0083] Where there is no conflict, the above embodiments and features can be combined with each other.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A dust removal centrifugal fan with a three-dimensional impeller, comprising a volute, an impeller, and a collector, characterized in that: The collector is fixedly connected to the volute, with one part of the impeller extending into the volute and the other part of the impeller extending into the collector; The impeller includes a rear plate and a hub. The rear plate has a central cone with a frustum-shaped structure. The rear plate is fixedly mounted on the hub through the central cone. Multiple blades are arranged in an array around the rear plate. The blades are single-plate backward-inclined arc structures, and impeller channels are formed between adjacent blades. The central cone is coaxially arranged with the wheel hub, and the diameter of the central cone gradually increases from the direction away from the rear disc to the direction closer to the rear disc; On the projection surface of the rear disc, the blade includes a first arc segment tangentially connected to the hub and a second arc segment away from the hub. The radius R2 of the first arc segment is 105.2mm-106.8mm and the arc length is 55.6mm-56.4mm. The radius R1 of the second arc segment is 142mm-144mm and the arc length is 85.5mm-86.5mm. The inlet angle ∠1 of the blade during installation is 65.1°-66.9°, and the outlet angle ∠2 of the blade during installation is 48.2°-49.5°. The diameter φ1 of the outer circumference formed by the outer ends of all the blades of the impeller is 300mm; The number of leaves is 8; The impeller is cut by a plane passing through the central axis of the impeller. On the cross section, the blade includes a first straight segment, an arc segment, an inclined straight segment and a second straight segment connected in sequence. The arc segment is tangent to both the first straight segment and the inclined straight segment. The blade portion corresponding to the first straight segment forms the inlet guide vane of the blade, while the blade portions corresponding to the arc segment, the inclined straight segment, and the second straight segment form the outlet guide vane of the blade. The length L1 of the first straight segment is 51mm-53mm, the radius R3 of the arc segment is 4.8mm-5.2mm and the arc length is 4.5mm-5.5mm, the length L3 of the second straight segment is 29.5mm-30.5mm, the angle ∠3 between the inclined straight segment and the second straight segment is 121°-123°, and the vertical distance L2 between the two endpoints of the inclined straight segment is 33.2mm-34.8mm in the direction parallel to the central axis of the wheel hub. The upper base diameter φ3 of the central cone is 58mm-60mm, and the lower base diameter φ4 of the central cone is 201mm-205mm; The circumference diameter φ2 formed by the outermost ends of the inlet guide vanes of all blades is 185mm-187mm; The collector includes a first connecting part, an air guide section, an air expansion section and a second connecting part connected in sequence. The air expansion section is fixedly connected to the volute through the second connecting part. The first connecting part is annular and has an air inlet on its inner circumference. The second connecting part is annular and has an air guide on its inner circumference. The collector is cut off by a plane passing through its central axis. On the cross-section, in the direction from the air inlet to the air guide, the air guide section is set as a cylindrical structure with a rectangular cross-section, and the air expansion section forms a gradually expanding frustum-shaped structure.

2. A dust removal centrifugal fan with a three-dimensional flow impeller according to claim 1, characterized in that: R2 is 106mm with an arc length of 56mm, R1 is 143mm with an arc length of 86mm, ∠1 is 66°, ∠2 is 49°, L1 is 52mm, R3 is 5mm with an arc length of 5mm, L3 is 30mm, ∠3 is 121.97°, L2 is 34mm, φ3 is 59mm, φ4 is 203mm, and φ2 is 186mm.

3. A dust removal centrifugal fan with a three-dimensional flow impeller according to claim 2, characterized in that: The diameter of the air inlet φ5 is 189mm-191mm, the length of the air guide section L4 is 102mm-104mm, the vertical distance L5 between the two ends of the air expansion section is 32.5mm-33.5mm in the direction parallel to the central axis of the collector, and the angle ∠4 between the air expansion section and the second connection part is 27°-28°. The distance L12 between the air inlet and the impeller is 55.6mm-56.5mm.

4. A dust removal centrifugal fan with a three-dimensional flow impeller according to claim 3, characterized in that: φ5 is 190mm, L4 is 103mm, L5 is 33mm, and ∠4 is 27.57°. The distance L12 between the air inlet and the impeller is 56mm.

5. A dust removal centrifugal fan with a three-dimensional flow impeller according to claim 4, characterized in that: The profile of the volute includes a first diffuser straight segment, a volute tongue segment, a first arc segment, a second arc segment, a third arc segment, a fourth arc segment, and a second diffuser straight segment that are connected tangentially in sequence; the first diffuser straight segment and the second diffuser straight segment enclose and form an air outlet, and the first arc segment, the second arc segment, the third arc segment, and the fourth arc segment are not concentric; Establish a rectangular coordinate system with the center of the impeller as the origin. When the first diffuser straight segment is located in the second quadrant, the coordinates of the center O1 of the first arc segment are (19, 18.5), the radius R5 is 172mm-174mm, and the arc length is 133.4mm-136.6mm. The coordinates of the center O4 of the second arc segment are (19, -18.5), the radius R6 is 209.7mm-212.3mm, and the arc length is 329mm-33mm. The center O3 of the third arc segment is (-19, -18.5), the radius R7 is 247.4mm-250.6mm, and the arc length is 387.8mm-392.3mm. The center O2 of the fourth arc segment is (-19, 18.5), the radius R8 is 284mm-288mm, and the arc length is 446.2mm-452mm. The first and second diffuser lines are both set perpendicular to the air outlet.

6. A dust removal centrifugal fan with a three-dimensional flow impeller according to claim 5, characterized in that: The volute also includes an air outlet diffuser section. On the side cross-sectional view of the volute, the air outlet diffuser section has a trapezoidal structure. The upper base L10 of the trapezoid is 54.5mm-55.5mm, the lower base L9 is 94mm-96mm, the height L11 is 101.5mm-104.5mm, and the interior angle ∠6 is 78°-79.5°. The width L9 of the air outlet is 94mm-96mm, and the height L8 is 173.8mm-176.5mm; The radius R4 of the volute tongue segment is 7.5mm-8.5mm and the arc length is 18.1mm-19.9mm. The length L6 of the first diffuser straight segment is 138mm-140mm and the length L7 of the second diffuser straight segment is 265mm-270mm. A tangent line is drawn to the volute tongue segment with the tangent point between the volute tongue segment and the first arc segment as the tangent point. The angle ∠5 between this tangent line and the first diffuser straight segment is 45°-45.8°.

7. A dust removal centrifugal fan with a three-dimensional flow impeller according to claim 6, characterized in that: It also includes a motor and a base. The motor is connected to the impeller via a motor shaft, and both the volute and the motor are fixedly mounted on the base. L10 is 55mm, L9 is 95mm, L11 is 103mm, ∠6 is 78.69°, L9 is 95mm, L8 is 175mm, R4 is 8mm and the arc length is 19mm, L6 is 139mm, L7 is 267mm, and ∠5 is 45.37°.

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