A high-pressure centrifugal fan with a three-dimensional flow impeller

Abstract

The present invention relates to the field of centrifugal fans, and in particular to a high-pressure centrifugal fan having a three-dimensional flow impeller, comprising a volute, a three-dimensional flow impeller, and a collector, wherein the volute and the collector are fixedly connected, and the three-dimensional flow impeller is disposed within the volute and partially extends into the collector; the three-dimensional flow impeller comprises a rear disc and a hub, the hub extending through the center of the rear disc and fixedly connected to the rear disc, the rear disc being configured as a cone, and having a plurality of blades arranged in an array around the rear disc. The present invention utilizes a small three-dimensional flow impeller, and by increasing the impeller's rotational speed, achieves a higher gas flow rate and pressure per unit volume of the fan, reduces the fan's volume and weight, and improves the problems of insufficient static pressure, low efficiency, and heavy weight commonly found in high-pressure centrifugal fans in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of centrifugal fan industry, and in particular to a high-pressure centrifugal fan with a three-dimensional flow impeller. Background Art

[0002] High-pressure centrifugal fans are a type of ventilation equipment widely used in civil and military applications such as steel, cement, chemicals, petroleum, and electricity. In recent years, with increasing societal demands for energy conservation, environmental protection, and production and working environments, the performance of high-pressure centrifugal fans has also been continuously improving. Existing high-pressure centrifugal fan blades are typically designed as single arc-shaped blades. This design hinders wind generation and causes airflow to separate easily at the blade outlet. Consequently, existing high-pressure centrifugal fans suffer from low flow, high power consumption, high noise, insufficient static pressure, low efficiency, and heavy weight, making them difficult to meet the demands of society and users.

[0003] Therefore, there is a need to further develop high-performance high-pressure centrifugal fans with high efficiency, high static pressure, light weight and small size. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-pressure centrifugal fan with a three-dimensional flow impeller, aiming to solve the common problems of insufficient static pressure, low efficiency and heavy weight of high-pressure centrifugal fans in the prior art.

[0005] In order to achieve the above-mentioned purpose, a high-pressure centrifugal fan with a three-dimensional flow impeller includes a volute, a three-dimensional flow impeller and a collector, the volute and the collector are fixedly connected, and the three-dimensional flow impeller is arranged in the volute and partially extends into the collector;

[0006] The three-dimensional flow impeller includes a rear disc and a hub. The hub passes through the center of the rear disc and is fixedly connected to the rear disc. The rear disc is set to a conical structure and has a plurality of blades arranged in an array around it.

[0007] The diameter φ5 of the outer circle formed by the outermost ends of all blades is 230 mm, the diameter φ6 of the inner circle formed by the innermost ends of all blades is 151 mm-153 mm, the length of the hub is L12, 1.52 < φ5 / L12 < 1.55;

[0008] The inlet angle ∠2 when the blades are installed is 82°-83°, the outlet angle ∠3 when the blades are installed is 42°-42.2°, and the height L13 of the three-dimensional flow impeller is 132mm-134mm;

[0009] The distance L11 where the three-dimensional flow impeller extends into the collector is 76.5 mm to 77.5 mm.

[0010] Furthermore, the blade includes a leading edge, a trailing edge, a first side edge connected between first ends of the leading edge and the trailing edge, and a second side edge connected between second ends of the leading edge and the trailing edge, the first side edge being a side edge away from the rear disk, and the second side edge being a side edge close to the rear disk;

[0011] On the unfolded view of the blade, the radius R9 of the trailing edge is 5138mm-5143mm and the arc length is 60mm-62mm;

[0012] From the direction of the blade away from the rear disc to the direction of the blade towards the rear disc, obtain six points A, B, C, D, E and F on the first side, and establish an XYZ three-dimensional coordinate system with the midpoint of the end face of the hub away from the rear disc as the center. The coordinate axes of the XY coordinate system are located on the end face of the hub away from the rear disc, and the Z axis is the coordinate axis extending in the direction of the center axis of the hub;

[0013] When the blade is located in the second quadrant of the XY coordinate system, and:

[0014] When the Z coordinate of point F is 94.1, the three-dimensional coordinates of point F are (-65.2, 94.7, 94.1);

[0015] When the Z coordinate of point A is 10.9, the three-dimensional coordinates of point A are (-75.1, 11.3, 10.9);

[0016] When the Z coordinate of point B is 19.1, the three-dimensional coordinates of point B are (-75.4, 18.5, 19.1);

[0017] When the Z coordinate of point C is 39.6, the three-dimensional coordinates of point C are (-77, 38, 59.6);

[0018] When the Z coordinate of point D is 59.7, the three-dimensional coordinates of point D are (-76.9, 57.7, 59.7);

[0019] When the Z coordinate of point E is 78.5, the three-dimensional coordinates of point E are (-73.4, 77, 78.5).

[0020] Furthermore, φ6 is 151.7 mm, L12 is 150 mm, ∠2 is 82.4°, ∠3 is 42.1°, L13 is 132.9 mm, R9 is 5140.6 mm and the arc length is 60.8 mm;

[0021] The number of blades is 11.

[0022] Furthermore, the collector includes a first connecting portion, a constricted portion, an air inlet, an air guide port, an expanding portion, and a second connecting portion. The collector is fixedly connected to the volute through the second connecting portion. The first connecting portion is annular and the inner circumference forms the air inlet. The second connecting portion is annular and the inner circumference forms the air guide port.

[0023] The necking portion includes a necking portion clearance fitting portion, the flaring portion includes a flaring portion clearance fitting portion, and the necking portion and the flaring portion are connected through the necking portion clearance fitting portion and the flaring portion clearance fitting portion.

[0024] Furthermore, the current collector is cut with a plane passing through the central axis of the current collector. In the cross section and in the direction from the air inlet to the air guide outlet, the narrowing portion is configured as a single arc structure, and the expanding portion includes a first arc segment and a second arc segment of the expanding portion that are connected and tangentially arranged.

[0025] The clearance fitting portion of the necking portion and the clearance fitting portion of the flaring portion are both configured as an inverted L-shaped structure, and the inverted L-shaped structure includes a first vertical portion, a horizontal portion, and a second vertical portion that are sequentially connected and vertically configured.

[0026] Furthermore, the diameter φ1 of the air inlet is 299 mm to 301 mm, the diameter of the constricted portion gradually decreases in the direction away from the air inlet, the radius R1 of the constricted portion is 192.5 mm to 194.5 mm, and the arc length is 171.5 mm to 173 mm;

[0027] The diameter of the flared portion gradually increases in the direction away from the air inlet. The radius R2 of the first arc segment of the flared portion is 59mm-60mm and the arc length is 26mm-27.6mm. The radius R3 of the second arc segment of the flared portion is 667mm-670mm and the arc length is 67mm-70mm.

[0028] The connection between the constricted portion and the expanded portion forms the narrowest part of the collector. The diameter φ3 of the narrowest part of the collector is 154.5 mm to 155.6 mm. The vertical distance L1 between the narrowest part of the collector and the air inlet is 149.5 mm to 150.5 mm. The vertical distance L2 between the narrowest part of the collector and the air guide port is 86.6 mm to 87.4 mm.

[0029] The length L3 of the first vertical portion and the length L5 of the second vertical portion are equal and are 3.9 mm to 4.1 mm, and the length L4 of the horizontal portion is 4.9 mm to 5.1 mm.

[0030] Furthermore, φ1 is 300mm, R1 is 193.5mm and the arc length is 172.1mm, R2 is 59.4mm and the arc length is 26.8mm, the radius R3 of the second arc segment of the flared portion is 668.3mm and the arc length is 68.4mm, φ3 is 155mm, L1 is 150mm, L2 is 87mm, L3 is 4mm, and L4 is 5mm.

[0031] 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 that are tangentially connected in sequence; the first diffuser straight segment and the second diffuser straight segment enclose an air outlet, and the first arc segment, the second arc segment, the third arc segment, and the fourth arc segment are not cocentric;

[0032] A rectangular coordinate system is established with the center of the three-dimensional impeller as the coordinate origin. When the first diffuser straight segment is located in the third quadrant, the coordinates of the center O2 of the first arc segment are (-13.9, 13.9), the radius R5 is 245mm-246.5mm, and the arc length is 94mm-95.5mm. The coordinates of the center O1 of the second arc segment are (13.9, 13.9), the radius R6 is 272.7mm-274.5mm, and the arc length is 428.5mm- 431mm, the coordinates of the center O4 of the third arc segment are (13.9, -13.9), the radius R7 is 300.4mm-302.4mm and the arc length is 472mm-475mm, the coordinates of the center O3 of the fourth arc segment are (-13.9, -13.9), the radius R8 is 328mm-330.5mm and the arc length is 515.5mm-519mm, and the first diffuser straight line segment and the second diffuser straight line segment are both set perpendicular to the air outlet.

[0033] Furthermore, the width L9 of the air outlet is 129.4mm-130.5mm, and the height L8 is 254mm-256mm;

[0034] The radius R4 of the volute tongue segment is 6.5mm-7.5mm and the arc length is 13.5mm-14mm. The length L6 of the first diffuser straight segment is 29.5mm-30.5mm. The length L7 of the second diffuser straight segment is 263mm-265mm. A tangent line is drawn to the volute tongue segment at the tangent point between the volute tongue segment and the first arc segment. The angle ∠1 between the tangent line and the first diffuser straight segment is 67.5°-68.3°.

[0035] The vertical distance L14 between the three-dimensional flow impeller and the volute tongue is 138mm-140mm.

[0036] Furthermore, a cylindrical recess is provided on the volute, the depth L10 of the recess is 71.6 mm to 72.4 mm, and the diameter φ4 of the recess is 394 mm to 398 mm;

[0037] The current collector is fixedly connected to the recessed portion via the second connecting portion.

[0038] The present invention provides a high-pressure centrifugal fan with a three-dimensional flow impeller:

[0039] (1) The three-dimensional flow impeller is used to improve the flow channel structure and blade shape of the impeller, reduce the energy loss at the blade inlet and outlet angles, suppress the vortex at the outlet angle and the airflow disturbance at the impeller inlet, reduce the energy loss during flow, and improve the effective flow range and efficiency of the fan;

[0040] (2) Using a small-volume three-dimensional flow impeller, by increasing the impeller speed, the fan can provide a larger gas flow and pressure per unit volume, reducing the volume and weight of the fan;

[0041] (3) By optimizing the radial distance between the volute tongue and the three-dimensional flow impeller, the airflow separation and energy loss are reduced, and the aerodynamic performance and stability of the fan are improved; and by adopting the logarithmic spiral volute arc transition, the airflow in the volute is ensured to be smooth and efficient, and the kinetic energy of the gas is effectively converted into pressure energy, thereby improving the static pressure efficiency;

[0042] (4) The inverted L-shaped clearance fit design of the necking and flaring parts can not only reduce the difficulty of parts processing and improve production efficiency, but also limit the deviation of parts during assembly, ensuring that the parts assembly meets the design requirements of the drawings; the curvature of the necking and flaring parts of the collector is optimized, and the radial gap between the three-dimensional flow impeller and the collector is adjusted to further improve the fan efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a structural schematic diagram of a high-pressure centrifugal fan with a three-dimensional flow impeller according to the present invention;

[0044] Figure 2 Schematic diagram of the volute profile;

[0045] Figure 3 is a schematic side cross-sectional view of the volute;

[0046] Figure 4 is a structural diagram of the impeller;

[0047] Figure 5 Schematic diagram of the side cross-sectional structure of the impeller;

[0048] Figure 6 This is the expanded diagram of the leaf;

[0049] Figure 7 is a side sectional view of the current collector;

[0050] Figure 8 This is a performance curve diagram of a high-pressure centrifugal fan with a three-dimensional flow impeller according to the present invention;

[0051] Figure 9 It is a performance curve diagram of the comparison ratio.

[0052] Description of reference numerals:

[0053] Volute 1; first diffuser straight section 11; volute tongue section 12; first arc segment 13; second arc segment 14; third arc segment 15; fourth arc segment 16; second diffuser straight section 17; air outlet 18; recess 19;

[0054] Three-dimensional flow impeller 2; blade 21; leading edge 211; first side 212; trailing edge 213; second side 214; hub 22; rear disc 23;

[0055] Current collector 3; first connecting portion 31; necking portion 32; necking portion clearance fitting portion 321; first vertical portion 3211; horizontal portion 3212; second vertical portion 3213; air inlet 33; air guide port 34; flared portion 35; flared portion first arc segment 351; flared portion second arc segment 352; flared portion clearance fitting portion 353; second connecting portion 36;

[0056] Motor 4; base 5. DETAILED DESCRIPTION

[0057] The present invention is described in detail below with reference to specific embodiments.

[0058] In the present invention, unless otherwise expressly specified and limited, when terms such as "set on", "connected", and "connected" appear, these terms should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrally connected; they can be directly connected or connected through one or more intermediate media. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The directional words that appear in the present invention are to better illustrate the characteristics of the features and the relationship between the features. It should be understood that when the placement direction of the present invention changes, the characteristics of the features and the direction of the relationship between the features also change accordingly. Therefore, the directional words do not constitute an absolute limitation on the characteristics of the features and the relationship between the features in space, but only play a relative limitation role.

[0059] The structural parameters adopted in the present invention are only for illustrating the technical solution of the present invention. That is, based on the basic structural parameters of the present invention, reasonable proportional scaling can be performed in actual production (for example, when the diameter of the impeller is 230 mm, it can be scaled 0.8-30 times, etc.), and such reasonable proportional scaling also falls within the scope of protection of the present invention.

[0060] See also Figure 1-9 A high-pressure centrifugal fan with a three-dimensional flow impeller comprises a volute 1, a three-dimensional flow impeller 2 and a collector 3, wherein the volute 1 and the collector 3 are fixedly connected, and the three-dimensional flow impeller 2 is arranged in the volute 1 and partially extends into the collector 3;

[0061] The three-dimensional flow impeller 2 includes a rear disc 23 and a hub 22. The hub 22 passes through the center of the rear disc 23 and is fixedly connected to the rear disc 23. The rear disc 23 is configured as a conical structure. A plurality of blades 21 are arranged in an array around the rear disc 23.

[0062] The diameter φ5 of the outer circle formed by the outermost ends of all blades 21 is 230 mm, the diameter φ6 of the inner circle formed by the innermost ends of all blades 21 is 151 mm-153 mm, the length of the hub 22 is L12, 1.52<φ5 / L12<1.55;

[0063] The inlet angle ∠2 of the blade 21 when installed is 82°-83°, the outlet angle ∠3 of the blade 21 when installed is 42°-42.2°, and the height L13 of the three-dimensional flow impeller 2 is 132mm-134mm;

[0064] The distance L11 that the three-dimensional flow impeller 21 extends into the collector 3 is 76.5 mm to 77.5 mm.

[0065] Preferably, φ6 is 151.7 mm, L12 is 150 mm, ∠2 is 82.4°, ∠3 is 42.1°, and L13 is 132.9 mm.

[0066] In this embodiment, the blade 21 includes a leading edge 211, a trailing edge 213, a first side edge 212 connected between first ends of the leading edge 211 and the trailing edge 213, and a second side edge 214 connected between second ends of the leading edge 211 and the trailing edge 213. The first side edge 212 is a side edge away from the rear disc 23, and the second side edge 214 is a side edge close to the rear disc 23.

[0067] In the unfolded view of the blade 21 , the radius R9 of the trailing edge 213 is 5138 mm to 5143 mm and the arc length is 60 mm to 62 mm; preferably, R9 is 5140.6 mm and the arc length is 60.8 mm;

[0068] From the direction of the blade 221 away from the rear disc 23 to the direction of the blade 21 approaching the rear disc 23, six points A, B, C, D, E, and F are obtained on the first side 212, and an XYZ three-dimensional coordinate system is established with the midpoint of the end face of the hub 22 away from the rear disc 23 as the center. The coordinate axes of the XY coordinate system are located on the end face of the hub 22 away from the rear disc 23, and the Z axis is a coordinate axis extending in the direction of the central axis of the hub 22;

[0069] When the blade 21 is located in the second quadrant of the XY coordinate system, and:

[0070] When the Z coordinate of point F is 94.1, the three-dimensional coordinates of point F are (-65.2, 94.7, 94.1);

[0071] When the Z coordinate of point A is 10.9, the three-dimensional coordinates of point A are (-75.1, 11.3, 10.9);

[0072] When the Z coordinate of point B is 19.1, the three-dimensional coordinates of point B are (-75.4, 18.5, 19.1);

[0073] When the Z coordinate of point C is 39.6, the three-dimensional coordinates of point C are (-77, 38, 59.6);

[0074] When the Z coordinate of point D is 59.7, the three-dimensional coordinates of point D are (-76.9, 57.7, 59.7);

[0075] When the Z coordinate of point E is 78.5, the three-dimensional coordinates of point E are (-73.4, 77, 78.5).

[0076] The number of blades is 11.

[0077] Through the above technical solution, a three-dimensional flow impeller 2 is adopted, which improves the flow channel structure of the impeller and the shape of the blades 21, reduces the energy loss at the inlet and outlet angles of the blades 21, suppresses the outlet angle vortex and the airflow disturbance at the impeller inlet, reduces the energy loss during flow, and improves the effective flow range and efficiency of the fan.

[0078] In this embodiment, the collector 3 includes a first connecting portion 31, a narrowing portion 32, an air inlet 33, an air guide port 34, a flaring portion 35, and a second connecting portion 36. The collector 3 is fixedly connected to the volute 1 via the second connecting portion 36. The first connecting portion 31 is annular and has an inner circumference forming the air inlet 33. The second connecting portion 36 is annular and has an inner circumference forming the air guide port 34.

[0079] The necked portion 32 includes a necked portion clearance fit portion 321 , and the flared portion 35 includes a flared portion clearance fit portion 353 . The necked portion 32 and the flared portion 35 are connected via the necked portion clearance fit portion 321 and the flared portion clearance fit portion 353 .

[0080] In this embodiment, the current collector 3 is cut along a plane passing through the central axis of the current collector 3. In the cross section from the air inlet 33 to the air guide 34, the narrowing portion 32 is configured as a single arc structure, and the expanding portion 35 includes a first arc segment 351 and a second arc segment 352 that are connected and tangentially arranged.

[0081] The narrowing portion clearance fitting portion 321 and the expanding portion clearance fitting portion 353 are both configured as an inverted L-shaped structure, which includes a first vertical portion 3211 , a horizontal portion 3212 and a second vertical portion 3213 that are sequentially connected and vertically arranged.

[0082] In this embodiment, the diameter φ1 of the air inlet 33 is 299 mm to 301 mm, the diameter of the constricted portion 32 gradually decreases in the direction away from the air inlet 33, the radius R1 of the constricted portion 32 is 192.5 mm to 194.5 mm, and the arc length is 171.5 mm to 173 mm;

[0083] The diameter of the flared portion 35 gradually increases in a direction away from the air inlet 33. The radius R2 of the first arc segment 351 of the flared portion is 59 mm to 60 mm and the arc length is 26 mm to 27.6 mm. The radius R3 of the second arc segment 352 of the flared portion is 667 mm to 670 mm and the arc length is 67 mm to 70 mm.

[0084] The connection between the constricted portion 32 and the expanded portion 35 forms the narrowest portion of the collector 3. The diameter φ3 of the narrowest portion of the collector 3 is 154.5 mm to 155.6 mm. The vertical distance L1 between the narrowest portion of the collector 3 and the air inlet 33 is 149.5 mm to 150.5 mm. The vertical distance L2 between the narrowest portion of the collector 3 and the air guide port 34 is 86.6 mm to 87.4 mm.

[0085] The length L3 of the first vertical portion 3211 and the length L5 of the second vertical portion 3213 are equal and are 3.9 mm to 4.1 mm, and the length L4 of the horizontal portion 3212 is 4.9 mm to 5.1 mm.

[0086] Preferably, φ1 is 300mm, R1 is 193.5mm and the arc length is 172.1mm, L1 is 150mm, R2 is 59.4mm and the arc length is 26.8mm, the radius R3 of the second arc segment of the flared portion is 668.3mm and the arc length is 68.4mm, L2 is 87mm, φ3 is 155mm, L3 is 4mm, and L4 is 5mm.

[0087] Through the above technical solution, in conjunction with the improvement of the impeller 2 and the volute 1, the separately manufactured collector 3 can reduce the processing difficulty and improve the production efficiency through the inverted L-shaped clearance fit design of the necking part and the flaring part, and limit the deviation of the parts during assembly, ensuring that the parts assembly meets the design requirements of the drawings; the curvature of the necking part and the flaring part of the collector 3 is optimized, and the radial clearance between the collector 3 and the three-dimensional flow impeller 2 is adjusted to further improve the efficiency of the fan.

[0088] 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, which are tangentially connected in sequence. The first diffuser straight segment 11 and the second diffuser straight segment 17 enclose 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 cocentric.

[0089] A rectangular coordinate system is established with the center of the three-dimensional impeller 2 as the coordinate origin. When the first diffuser straight segment 11 is located in the third quadrant, the coordinates of the center O2 of the first arc segment 13 are (-13.9, 13.9), the radius R5 is 245mm-246.5mm, and the arc length is 94mm-95.5mm. The coordinates of the center O1 of the second arc segment 14 are (13.9, 13.9), the radius R6 is 272.7mm-274.5mm, and the arc length is 428.5mm-43. 1mm, the coordinates of the center O4 of the third arc segment 15 are (13.9, -13.9), the radius R7 is 300.4mm-302.4mm and the arc length is 472mm-475mm, the coordinates of the center O3 of the fourth arc segment 16 are (-13.9, -13.9), the radius R8 is 328mm-330.5mm and the arc length is 515.5mm-519mm, and the first diffuser straight segment 11 and the second diffuser straight segment 17 are both arranged perpendicular to the air outlet 18.

[0090] Preferably, a rectangular coordinate system is established with the center of the three-dimensional flow impeller 2 as the coordinate origin. When the first diffuser straight segment 11 is located in the third quadrant, the coordinates of the center O2 of the first arc segment 13 are (-13.9, 13.9), the radius R5 is 245.8 mm and the arc length is 94.7 mm, the coordinates of the center O1 of the second arc segment 14 are (13.9, 13.9), the radius R6 is 273.6 mm and the arc length is 429.7 mm, the coordinates of the center O4 of the third arc segment 15 are (13.9, -13.9), the radius R7 is 301.4 mm and the arc length is 473.4 mm, and the coordinates of the center O3 of the fourth arc segment 16 are (-13.9, -13.9), the radius R8 is 329.2 mm and the arc length is 517.1 mm.

[0091] In this embodiment, the width L9 of the air outlet 18 is 129.4 mm to 130.5 mm, and the height L8 is 254 mm to 256 mm;

[0092] The radius R4 of the tongue segment 12 is 6.5mm-7.5mm, and the arc length is 13.5mm-14mm. The length L6 of the first diffuser straight segment 11 is 29.5mm-30.5mm, and the length L7 of the second diffuser straight segment 17 is 263mm-265mm. The angle ∠1 between the tangent line of the tongue segment 12 and the first diffuser straight segment 13 and the first diffuser straight segment 11 is 67.5°-68.3°. The vertical spacing L14 between the three-dimensional flow impeller 2 and the tongue 12 is 138mm-140mm. Preferably, R4 is 7mm, the arc length is 13.7mm, L6 is 29.9mm, L7 is 264.1mm, ∠1 is 67.92°, and L14 is 139.1mm.

[0093] In this embodiment, a cylindrical recess 19 is provided on the volute 1, the depth L10 of the recess 19 is 71.6 mm-72.4 mm, and the diameter φ4 of the recess 19 is 394 mm-398 mm;

[0094] The current collector 3 is fixedly connected to the recess 19 via the second connecting portion 36. Preferably, L10 is 72 mm, and the diameter φ4 of the recess 19 is 396 mm.

[0095] In this embodiment, a motor 4 and a machine base 5 are further included. The motor 4 is transmission-connected to the three-dimensional impeller 2 via a motor shaft. The volute 1 and the motor 4 are both fixedly arranged on the machine base 5 .

[0096] Through the above technical solution, the radial distance between the volute tongue 1 and the three-dimensional flow impeller 2 is optimized, which reduces the airflow separation and energy loss, and improves the aerodynamic performance and stability of the fan; and by adopting the arc transition of the logarithmic spiral volute 1, it ensures the smooth and efficient flow of the air in the volute 1, effectively converts the kinetic energy of the gas into pressure energy, and improves the static pressure efficiency.

[0097] To verify this embodiment, based on the preferred structural parameters provided in this embodiment, a high-pressure centrifugal fan with a three-dimensional flow impeller was manufactured with a diameter of 230 mm (the diameter of the outer circle surrounded by the outermost ends of all blades 21) as a test example. At the same time, a traditional high-pressure centrifugal fan with a traditional single arc plate blade and an impeller with a diameter of 630 mm was manufactured as a comparative example. The test results were converted to an atmospheric pressure of 101325 Pa, an atmospheric temperature of 20°C, and a medium density of 1.2 kg / m 3 The test data under the test conditions are as follows: the fan speed of the test case is 10000r / min, and the fan speed of the comparative example is 2800r / min. The test data and Figure 8 The performance curve shown in Table 2 is obtained as a comparative example. Figure 9 The performance curve shown is based on volume flow as the horizontal axis. In the performance curve, qvsglGu is the volume flow, LAGu is the A sound level, ηr is the fan efficiency, PrGu is the impeller power, pFGu is the total pressure, and psFGu is the static pressure.

[0098] Table 1

[0099]

[0100] Table 2

[0101]

[0102] From the test data and performance curve, we can see that compared with the test example:

[0103] (1) The impeller diameter of the comparative example (630 mm) is 2.74 times the diameter of the three-dimensional flow impeller of the test example (230 mm). Under the design of the reduced volume and weight of the impeller of the test example, the optimal fan efficiency of the test example is 62.389%, and the volume flow rate at this time is 2543.8m 3 / h, the total pressure is 7237.7Pa, the static pressure is 6973.9Pa, and the static efficiency is 60.193%; while the optimal fan efficiency of the comparative example is 62.597%, and the volume flow rate at this time is 1843.2m 3 / h, total pressure of 8579.8Pa, static pressure of 7837.9Pa, and static efficiency of 57.381%. Although the two have similar fan efficiencies, the test example's fan can provide greater gas flow and pressure per unit volume.

[0104] (2) Furthermore, the volume flow range of the test case is 1876.1m 3 / h-5569.4m 3 / h, while the volume flow range of the comparative example is 1150.8m 3 / h-3946.5m 3 / h, in comparison, the test case has a wider flow range.

[0105] Compared with the prior art, the high-pressure centrifugal fan with a three-dimensional flow impeller of the present invention adopts a small-volume three-dimensional flow impeller. By increasing the rotation speed of the impeller, the fan can provide a larger gas flow and pressure per unit volume, reducing the volume and weight of the fan, and improving the problems of insufficient static pressure, low efficiency and heavy weight that are common in high-pressure centrifugal fans in the prior art.

[0106] In the absence of conflict, the above-mentioned embodiments and features thereof may be combined with each other.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A high-pressure centrifugal fan with a three-dimensional flow impeller, characterized in that: It includes a volute, a three-dimensional flow impeller and a collector, wherein the volute and the collector are fixedly connected, and the three-dimensional flow impeller is arranged in the volute and partially extends into the collector; The three-dimensional impeller includes a rear disc and a hub. The hub passes through the center of the rear disc and is fixedly connected to the rear disc. The rear disc is set to a conical structure and has a plurality of blades arranged in an array around it. The diameter φ5 of the outer circle formed by the outermost ends of all blades is 230 mm, the diameter φ6 of the inner circle formed by the innermost ends of all blades is 151 mm-153 mm, the length of the hub is L12, 1.52 < φ5 / L12 < 1.55; The inlet angle ∠2 when the blades are installed is 82°-83°, the outlet angle ∠3 when the blades are installed is 42°-42.2°, and the height L13 of the three-dimensional flow impeller is 132mm-134mm; The distance L11 of the three-dimensional flow impeller extending into the collector is 76.5mm-77.5mm; The collector includes a first connecting portion, a constricted portion, an air inlet, an air guide port, a flared portion, and a second connecting portion. The collector is fixedly connected to the volute through the second connecting portion. The first connecting portion is annular and the inner circumference forms the air inlet. The second connecting portion is annular and the inner circumference forms the air guide port. The necking portion includes a necking portion clearance fit portion, the flaring portion includes a flaring portion clearance fit portion, and the necking portion and the flaring portion are connected via the necking portion clearance fit portion and the flaring portion clearance fit portion; The current collector is cut with a plane passing through the central axis of the current collector. In the cross section and in the direction from the air inlet to the air guide outlet, the narrowing portion is configured as a single arc structure, and the expanding portion includes a first arc segment and a second arc segment of the expanding portion that are connected and tangentially arranged. The narrowing portion clearance fitting portion and the expanding portion clearance fitting portion are both configured as an inverted L-shaped structure, and the inverted L-shaped structure includes a first vertical portion, a horizontal portion, and a second vertical portion that are sequentially connected and vertically configured.

2. A high-pressure centrifugal fan with a three-dimensional flow impeller according to claim 1, characterized in that: The blade includes a leading edge, a trailing edge, a first side edge connected between first ends of the leading edge and the trailing edge, and a second side edge connected between second ends of the leading edge and the trailing edge, wherein the first side edge is a side edge away from the rear disk, and the second side edge is a side edge close to the rear disk; On the unfolded view of the blade, the radius R9 of the trailing edge is 5138mm-5143mm and the arc length is 60mm-62mm; From the direction of the blade away from the rear disc to the direction of the blade towards the rear disc, obtain six points A, B, C, D, E and F on the first side, and establish an XYZ three-dimensional coordinate system with the midpoint of the end face of the hub away from the rear disc as the center. The coordinate axes of the XY coordinate system are located on the end face of the hub away from the rear disc, and the Z axis is the coordinate axis extending in the direction of the center axis of the hub; When the blade is located in the second quadrant of the XY coordinate system, and: When the Z coordinate of point F is 94.1, the three-dimensional coordinates of point F are (-65.2, 94.7, 94.1); When the Z coordinate of point A is 10.9, the three-dimensional coordinates of point A are (-75.1, 11.3, 10.9); When the Z coordinate of point B is 19.1, the three-dimensional coordinates of point B are (-75.4, 18.5, 19.1); When the Z coordinate of point C is 39.6, the three-dimensional coordinates of point C are (-77, 38, 39.6); When the Z coordinate of point D is 59.7, the three-dimensional coordinates of point D are (-76.9, 57.7, 59.7); When the Z coordinate of point E is 78.5, the three-dimensional coordinates of point E are (-73.4, 77, 78.5).

3. The high-pressure centrifugal fan with a three-dimensional flow impeller according to claim 2, characterized in that: φ6 is 151.7mm, L12 is 150mm, ∠2 is 82.4°, ∠3 is 42.1°, L13 is 132.9mm, R9 is 5140.6mm and the arc length is 60.8mm; The number of blades is 11.

4. The high-pressure centrifugal fan with a three-dimensional flow impeller according to claim 1, characterized in that: The diameter φ1 of the air inlet is 299mm-301mm, the diameter of the necking portion gradually decreases in the direction away from the air inlet, the radius R1 of the necking portion is 192.5mm-194.5mm and the arc length is 171.5mm-173mm; The diameter of the flared portion gradually increases in the direction away from the air inlet. The radius R2 of the first arc segment of the flared portion is 59mm-60mm and the arc length is 26mm-27.6mm. The radius R3 of the second arc segment of the flared portion is 667mm-670mm and the arc length is 67mm-70mm. The connection between the constricted portion and the expanded portion forms the narrowest part of the collector. The diameter φ3 of the narrowest part of the collector is 154.5 mm to 155.6 mm. The vertical distance L1 between the narrowest part of the collector and the air inlet is 149.5 mm to 150.5 mm. The vertical distance L2 between the narrowest part of the collector and the air guide port is 86.6 mm to 87.4 mm. The length L3 of the first vertical portion and the length L5 of the second vertical portion are equal and are 3.9 mm to 4.1 mm, and the length L4 of the horizontal portion is 4.9 mm to 5.1 mm.

5. The high-pressure centrifugal fan with a three-dimensional flow impeller according to claim 4, characterized in that: φ1 is 300mm, R1 is 193.5mm and the arc length is 172.1mm, R2 is 59.4mm and the arc length is 26.8mm, the radius R3 of the second arc segment of the flared part is 668.3mm and the arc length is 68.4mm, φ3 is 155mm, L1 is 150mm, L2 is 87mm, L3 is 4mm, and L4 is 5mm.

6. The high-pressure centrifugal fan with a three-dimensional flow impeller according to claim 5, 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, which are sequentially connected tangentially; the first diffuser straight segment and the second diffuser straight segment enclose an air outlet, and the first arc segment, the second arc segment, the third arc segment, and the fourth arc segment are not cocentric; A rectangular coordinate system is established with the center of the three-dimensional impeller as the coordinate origin. When the first diffuser straight segment is located in the third quadrant, the coordinates of the center O2 of the first arc segment are (-13.9, 13.9), the radius R5 is 245mm-246.5mm, and the arc length is 94mm-95.5mm. The coordinates of the center O1 of the second arc segment are (13.9, 13.9), the radius R6 is 272.7mm-274.5mm, and the arc length is 428.5mm- 431mm, the coordinates of the center O4 of the third arc segment are (13.9, -13.9), the radius R7 is 300.4mm-302.4mm and the arc length is 472mm-475mm, the coordinates of the center O3 of the fourth arc segment are (-13.9, -13.9), the radius R8 is 328mm-330.5mm and the arc length is 515.5mm-519mm, and the first diffuser straight line segment and the second diffuser straight line segment are both set perpendicular to the air outlet.

7. The high-pressure centrifugal fan with a three-dimensional flow impeller according to claim 6, characterized in that: The width L9 of the air outlet is 129.4mm-130.5mm, and the height L8 is 254mm-256mm; The radius R4 of the volute tongue segment is 6.5mm-7.5mm and the arc length is 13.5mm-14mm. The length L6 of the first diffuser straight segment is 29.5mm-30.5mm. The length L7 of the second diffuser straight segment is 263mm-265mm. A tangent line is drawn to the volute tongue segment at the tangent point between the volute tongue segment and the first arc segment. The angle ∠1 between the tangent line and the first diffuser straight segment is 67.5°-68.3°. The vertical distance L14 between the three-dimensional flow impeller and the volute tongue is 138mm-140mm.

8. The high-pressure centrifugal fan with a three-dimensional flow impeller according to claim 7, characterized in that: The volute is provided with a cylindrical recess, the depth L10 of the recess is 71.6mm-72.4mm, and the diameter φ4 of the recess is 394mm-398mm; The current collector is fixedly connected to the recessed portion via the second connecting portion.

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