Three-dimensional flow impeller centrifugal fan

Abstract

The three-dimensional flow impeller centrifugal fan comprises an impeller device, and the impeller device comprises a front disc, a plurality of three-dimensional blades, a rear disc meridian acceleration flow guide body, a shaft sleeve and a reinforcing piece. The shaft sleeve is arranged at a set position of the rear disc meridian acceleration flow guide body, and the shaft sleeve is connected with the rear disc meridian acceleration flow guide body through the reinforcing piece; the rear disc meridian acceleration flow guide body is connected with the front disc through the ternary blades; the ternary blades are located between the rear disc meridian acceleration flow guide body and the front disc, and a flow channel allowing fluid to pass through is formed between every two adjacent ternary blades. The ternary blade belongs to a multi-curved-surface shape, so that the flow loss is effectively reduced, and the influence of separation flow, vortex and secondary flow is effectively reduced; the ternary blade is suitable for high-speed operation, and the separation loss in a runner of the impeller device is greatly reduced; the working performance of the centrifugal fan is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of fans, and in particular relates to a three-dimensional flow impeller centrifugal fan. Background Art

[0002] The traditional centrifugal fan impeller is a product designed using the binary design theory. Although the binary design theory of centrifugal fans has played an important role in history, with the development of technology and the improvement of efficiency requirements, the traditional binary design theory of centrifugal fans has obvious limitations and shortcomings in design accuracy, efficiency improvement, adaptability, maintenance convenience and noise control.

[0003] During operation, the impeller of a centrifugal fan will face various losses, which have a significant impact on the efficiency and noise of the fan, and may also cause wear and failure of the equipment.

[0004] 1. Flow loss: This is one of the main losses in the impeller. Flow loss includes friction loss along the flow channel, boundary layer separation on the blades, wake flow caused by uneven distribution of radial outlet velocity of the impeller, axial vortex and impact loss at the flow channel inlet, etc. These flow losses will lead to energy loss and reduce the overall efficiency of the fan.

[0005] 2. Leakage loss: There is a certain gap between the impeller inlet and the guide cover. Due to the pressure difference between the impeller inlet and outlet, part of the gas will leak back to the low-pressure area of ​​the impeller inlet through the gap, causing leakage loss. This leakage not only reduces the effective gas flow, but also increases the energy consumption of the fan.

[0006] 3. Wear loss: When the centrifugal fan is used to transport dusty gas, dust particles in the gas, such as coal powder, sand, rocks, etc., will impact the surface of the impeller blades, causing the blades to be worn. This wear not only reduces the service life of the blades, but also affects the performance and stability of the fan.

[0007] 4. Secondary flow and stratification effect: In the impeller flow channel, due to the uneven velocity distribution, secondary flow and stratification effects will occur. These phenomena will increase flow resistance and lead to energy loss.

[0008] 5. Pressure pulsation and vibration loss: Under certain working conditions, such as when running at low flow rates, a channel vortex may form inside the impeller, causing a decrease in work capacity. At this time, the pressure pulsation amplitude of the fan reaches its peak. This pressure pulsation not only increases the vibration and noise of the fan, but may also cause damage to the equipment.

[0009] In summary, in order to reduce the various working losses of the centrifugal fan and improve the working efficiency and service life of the centrifugal fan, it is necessary to optimize the design from multiple aspects. At present, there is a lack of a new type of three-dimensional flow impeller centrifugal fan to improve the working performance of the centrifugal fan.

[0010] Therefore, a new technology is needed to solve the problem of lack of a three-dimensional flow impeller centrifugal fan in the prior art. Summary of the invention

[0011] In order to solve the above problems in the prior art, the present invention provides a three-dimensional flow impeller centrifugal fan, which can improve the working performance of the centrifugal fan and reduce various working losses.

[0012] The present invention adopts the following technical solutions:

[0013] A three-dimensional flow impeller centrifugal fan comprises an impeller device, wherein the impeller device comprises a front disk, a plurality of three-dimensional blades, a rear disk meridian acceleration guide body, a shaft sleeve and a reinforcement member; the shaft sleeve is arranged at a set position of the rear disk meridian acceleration guide body, and the shaft sleeve is connected to the rear disk meridian acceleration guide body through the reinforcement member; the rear disk meridian acceleration guide body is connected to the front disk through the three-dimensional blades; a plurality of the three-dimensional blades are located between the rear disk meridian acceleration guide body and the front disk, and a flow channel for fluid to pass through is formed between adjacent three-dimensional blades.

[0014] Furthermore, the rear disc meridian acceleration guide body includes a rear disc and a meridian acceleration guide plate; the rear disc is a flat plate having a front side and a back side; the meridian acceleration guide plate is an arc-shaped plate; the rear disc and the meridian acceleration guide plate are connected together and are integrally formed.

[0015] Furthermore, the blade shape of the three-dimensional blade is controlled and formed by a plurality of space curves.

[0016] Furthermore, the blade shape of the three-dimensional blade is controlled by six space curves, and each space curve is generated by the following control equation;

[0017] The governing equations include the following formula:

[0018] X = 0 to 360.3;

[0019] Y=a+bX 1 +cX 2 +dX 3 +eX 4 +fX 5 ;

[0020] Z=a+bX+cY+dX 2 +eY 2+fX 3 +gY 3 +hXY+iX 2 Y+jXY 2 ;

[0021] Among them, X is the parameter of the x coordinate of the spatial rectangular coordinate system xyz, Y is the parameter of the y coordinate of the spatial rectangular coordinate system xyz, and Z is the parameter of the z coordinate of the spatial rectangular coordinate system xyz; the xoy plane of the spatial rectangular coordinate system xyz coincides with the front face of the rear disc; the origin o of the spatial rectangular coordinate system xyz is located at the center of the front face of the rear disc; the positive direction of the z coordinate of the spatial rectangular coordinate system xyz extends "from the rear disc to the front disc direction"; a, b, c, d, e, f, g, h, i, and j are coefficients.

[0022] Furthermore, with the center of the front side of the rear disc as the center of the circular array, a plurality of three-dimensional blades are distributed in a circular array with the center of the circular array as the center of the circle and are arranged on the rear disc meridian acceleration guide body.

[0023] Furthermore, a plane circle is assumed to have its center on the central axis of the rear disc meridian acceleration guide body, and a plane distance from the center to the leading edge of the three-dimensional blade is a radius of the plane circle. The contact position between the leading edge of the three-dimensional blade and the plane circle is defined as a tangent point, and a tangent line to the plane circle is drawn through the tangent point. The spatial angle formed by the tangent line and the leading edge of the three-dimensional blade is an inlet angle of attack. The inlet angle of attack of the leading edge of the three-dimensional blade increases gradually "from the rear disc meridian acceleration guide body to the front disc direction", and the inlet angle of attack is controlled within the range of 24° to 27°.

[0024] Furthermore, the meridian acceleration guide plate has a mounting hole; the shaft sleeve is arranged in the mounting hole, and the front end of the shaft sleeve and the front end of the meridian acceleration guide plate are transitioned by welding.

[0025] Furthermore, the front plate includes an outer flat ring plate, a first arc panel and a second arc panel; the outer flat ring plate, the first arc panel and the second arc panel are connected together in sequence; the outer flat ring plate, the first arc panel and the second arc panel are integrally formed.

[0026] Furthermore, the three-dimensional flow impeller centrifugal fan also includes a fan casing; the impeller device is rotatably arranged in the fan casing, wherein the sleeve is used to connect with the power shaft; the fan casing includes a main shell and an air inlet duct assembly; the air inlet duct assembly is arranged on the main shell for intake of air; the air inlet duct assembly has a shell air inlet, and the shell air inlet is connected to the flow channel; the impeller device is arranged in the main shell, and the front disk maintains a set gap with the air inlet duct assembly.

[0027] Furthermore, the main shell has an air outlet; the air outlet is connected to the flow channel; the shell side panel at the air outlet forms an angle of 10° to 15° with the middle longitudinal plane of the air outlet.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] A three-dimensional flow impeller centrifugal fan of the present invention has a new type of three-dimensional blade, the shape of which is more suitable for the actual flow state of the fluid, effectively reducing the flow loss, and effectively reducing the influence of separation flow, vortex and secondary flow. The newly developed three-dimensional blade of the present invention is suitable for high-speed operation, which greatly reduces the separation loss inside the flow channel of the impeller device. In the flow channel of the impeller device of the present invention, the secondary flow cannot be fully formed, which further reduces the influence of the secondary flow. The newly developed three-dimensional flow impeller centrifugal fan of the present invention improves the working performance of the fan and reduces various working losses.

[0030] At the same time, the rear plate radial acceleration guide body, shaft sleeve and reinforcement in the present invention are also newly designed, among which the rear plate radial acceleration guide body is integrally formed, and its strength is effectively guaranteed; the rear plate radial acceleration guide body is combined with the "shaft sleeve and reinforcement" together, and the new combination method can realize the fluid diversion and reduce the manufacturing cost, killing two birds with one stone; in the past, the rear structure of the impeller device was a hub forging, the guide shape was turned out, and then it was welded to the flat rear disc, which had too high a manufacturing cost; after the emergence of the present invention, the rear plate radial acceleration guide body is creatively formed as one piece, and then the rear plate radial acceleration guide body is combined with the shaft sleeve and reinforcement is added to form a new rear structure of the impeller device, which effectively reduces the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The technology of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0032] Figure 1 It is a three-dimensional schematic diagram of a three-dimensional flow impeller centrifugal fan of the present invention;

[0033] Figure 2 is a three-dimensional schematic diagram of the air inlet duct assembly of the present invention from a first viewing angle;

[0034] Figure 3 It is a front view of the three-dimensional flow impeller centrifugal fan of the present invention;

[0035] Figure 4 yes Figure 3 Partial top view at E;

[0036] Figure 5 1 is a schematic vertical cross-sectional view of a three-dimensional flow impeller centrifugal fan of the present invention (wherein the three-dimensional blades shown are projected blades);

[0037] Figure 6 is a three-dimensional schematic diagram of the impeller device of the present invention from a first viewing angle (wherein the dividing line between the "outer flat ring plate and the first arc panel" is intentionally shown, but the actual "dividing line" does not exist) (wherein the dividing line between the "first arc panel and the second arc panel" is intentionally shown, but the actual "dividing line" does not exist);

[0038] Figure 7 is a three-dimensional schematic diagram of the impeller device of the present invention from a second viewing angle (wherein the dividing line between the “rear disc and the meridian acceleration guide plate” is intentionally shown, and the actual “dividing line” does not exist);

[0039] Figure 8 Schematic diagram of the arrangement of the shaft sleeve and the reinforcement member of the present invention (partial schematic diagram);

[0040] Fig. 9 It is a three-dimensional schematic diagram of a plurality of three-dimensional blades uniformly arranged on the rear plate meridian acceleration guide body of the present invention (wherein each flow channel exhibits equal area expansion);

[0041] Fig.10 Schematic diagram of the shape of the three-dimensional blade of the present invention controlled by six space curves ( Fig.10 The six space curves in are actually smooth, which are noted here to facilitate people’s correct understanding);

[0042] Fig.11 It is a schematic diagram of the pre-assembly of the rear plate mid-air acceleration guide body, the shaft sleeve and the reinforcement member of the present invention;

[0043] Fig.12 is a schematic vertical cross-sectional view of the impeller device of the present invention (wherein, the shape of the "front disc" integrally formed can be shown) (wherein, the shape of the "rear disc meridian acceleration guide body" integrally formed can be shown) (wherein, the three-dimensional blade shown is a projected blade);

[0044] Fig.13 It is a front view of the impeller device of the present invention (mainly showing the inlet angle of attack) (without showing the rear plate meridian acceleration guide body and the shaft sleeve) (wherein the three-dimensional blade shown is a projected blade);

[0045] Fig.14 The velocity distribution diagram of the three-dimensional flow impeller centrifugal fan of the present invention is obtained by analyzing the velocity distribution diagram using computational fluid dynamics (CFD) software (wherein the three-dimensional blade shown is the cross section of the blade) (the three-dimensional flow impeller centrifugal fan can be regarded as the second embodiment, which is only at the outlet and Figure 1 There are subtle differences).

[0046] Reference numerals:

[0047] 1-Three-dimensional flow impeller centrifugal fan; F-Velocity distribution area;

[0048] 2- impeller device; 21- front disk; 211- peripheral flat ring plate; 212- first arc panel; R3- radius; 213- second arc panel; R4- radius; 214- impeller air inlet; S2- center axis; D1- diameter; 22- three-dimensional blade; 221- leading edge; M- space curve; M1- first space curve; M2- second space curve; M3- third space curve; M4- fourth space curve; M5- fifth space curve; M6-sixth spatial curve; 23-rear plate meridian acceleration guide body; 231-rear plate; K-front; K1-center of the front; L-back; S1-central axis; 232-meridian acceleration guide plate; R1-radius; W-mounting hole; V-front end; 24-shaft sleeve; 241-front end; 242-connecting hole; S3-central axis; 25-reinforcement; 251-arc side; 252-vertical side; 26-flow channel; G-dividing line; H-direction;

[0049] x-x coordinate of the spatial rectangular coordinate system xyz; y-y coordinate of the spatial rectangular coordinate system xyz; z-z coordinate of the spatial rectangular coordinate system xyz; o-origin o of the spatial rectangular coordinate system xyz;

[0050] N-circular array center; P-plane circle; P1-center of circle; R2-radius; Q-tangent line; T-inlet attack angle;

[0051] 3-fan casing; 31-main casing; 311-air outlet; B-middle longitudinal plane; 312-casing side panel; C-included angle; E-local viewing angle number; 32-air inlet duct assembly; 321-air deflector; A-casing air inlet; 322-fixing plate. DETAILED DESCRIPTION

[0052] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the present invention, so as to fully understand the purpose, scheme and effect of the present invention. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other without conflict. The same reference numerals used throughout the drawings indicate the same or similar parts.

[0053] It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature, or it may be indirectly fixed or connected to the other feature. In addition, the descriptions of up, down, left, right, etc. used in the present invention are only relative to the relative positional relationship of the components of the present invention in the drawings.

[0054] Reference Figures 1 to 13A three-dimensional impeller centrifugal fan 1 includes an impeller device 2, wherein the impeller device 2 includes a front disk 21, a plurality of three-dimensional blades 22, a rear disk meridian acceleration guide body 23, a sleeve 24 and a reinforcement 25; the sleeve 24 is arranged at a set position of the rear disk meridian acceleration guide body 23, and the sleeve 24 is connected to the rear disk meridian acceleration guide body 23 through the reinforcement 25, wherein the sleeve 24 is used to connect with a power shaft; the rear disk meridian acceleration guide body 23 is connected to the front disk 21 through the three-dimensional blades 22; a plurality of the three-dimensional blades 22 are located between the rear disk meridian acceleration guide body 23 and the front disk 21, and a flow channel 26 for fluid to pass through is formed between adjacent three-dimensional blades 22. The three-dimensional blade 22 of the present invention effectively reduces flow loss, and effectively reduces the influence of separation flow, vortex and secondary flow; in the flow channel 26 of the present invention, the secondary flow cannot be fully formed, further reducing the influence of the secondary flow. The three-dimensional flow impeller centrifugal fan newly developed by the present invention improves the working performance of the fan and reduces various working losses.

[0055] Reference Figures 1 to 13 In one embodiment, the rear plate meridian acceleration guide body 23 includes a rear plate 231 and a meridian acceleration guide plate 232; the rear plate 231 is a flat plate having a front side K and a back side L; the meridian acceleration guide plate 232 is an arc-shaped plate, which is conducive to the diversion of the fluid; the rear plate 231 and the meridian acceleration guide plate 232 are connected together, and the two are integrally formed, and their strength is effectively guaranteed; the rear plate meridian acceleration guide body 23 of the present invention is integrally formed, which helps to combine it with the "shaft sleeve 24 and the reinforcement 25" to reduce the manufacturing cost.

[0056] Reference Fig.11 and Fig.12 In one embodiment, the arc radius R1 of the meridian acceleration guide plate 232 is 165 mm.

[0057] Reference Figures 1 to 13 In one embodiment, the blade shape of one of the three-dimensional blades 22 is controlled and formed by a plurality of space curves M; the remaining three-dimensional blades are copied through a circular array using the three-dimensional blade as a source object.

[0058] Reference Figures 1 to 13 In one embodiment, the blade shape of the three-dimensional blade 22 is controlled by six space curves M, and each space curve M is generated by the following control equation;

[0059] The governing equations include the following formula:

[0060] X = 0 to 360.3 (1);

[0061] Y=a+bX 1 +cX2 +dX 3 +eX 4 +fX 5 (2);

[0062] Z=a+bX+cY+dX 2 +eY 2 +fX 3 +gY 3 +hXY+iX 2 Y+jXY 2 (3);

[0063] Among them, X is the parameter of the x coordinate of the spatial rectangular coordinate system xyz, Y is the parameter of the y coordinate of the spatial rectangular coordinate system xyz, and Z is the parameter of the z coordinate of the spatial rectangular coordinate system xyz; the xoy plane of the spatial rectangular coordinate system xyz coincides with the front face K of the rear plate 231; the origin o of the spatial rectangular coordinate system xyz is located at the center K1 of the front face of the rear plate 231; the positive direction of the z coordinate of the spatial rectangular coordinate system xyz extends "from the rear plate 231 to the front plate 21" (refer to Figure 5 to understand); a, b, c, d, e, f, g, h, i, j are coefficients.

[0064] Reference Figures 1 to 13 In one embodiment, in generating the space curve, for formula (1) "X = 0 to 360.3", parameters are continuously taken within the set interval (for example: X1 (starting value), X2, ..., 100, 100.1, 100.2, 100.3, 100.4, ..., X n (final value, such as 360.3)), so that the generated space curve M is continuous and smooth. The six space curves M include a first space curve M1, a second space curve M2, a third space curve M3, a fourth space curve M4, a fifth space curve M5 and a sixth space curve M6.

[0065] The coefficients of the first space curve M1 in formula (2) are as follows:

[0066] a=1.64E+02; b=8.92E-01; c=-5.87E-03; d=1.92E-05; e=-3.98E-08; f=3.67E-11;

[0067] The coefficients of the first space curve M1 in formula (3) are as follows:

[0068] a=2.14E+03; b=3.48E+00; c=-2.67E+01; d=-8.52E-03; e=1.15E-01; f=2.91E-06;

[0069] g=-1.63E-04; h=-2.27E-02; i=3.30E-05; j=3.31E-05;

[0070] Explanatory, such as a = 1.64E + 02, where 1.64E + 02 is a way of expressing in scientific notation, specifically 1.64 times 10 to the power of 2. This can be expanded to:

[0071] 1.64E+02=1.64×10 2 =164;

[0072] Therefore, 1.64E+02 is equal to 164;

[0073] Explanatory, such as d = 1.92E-05, where 1.92E-05 is a way of expressing in scientific notation, specifically 1.92 times 10 to the power of -5. This can be expanded to:

[0074] 1.92E-05=1.92×10 -5 =0.0000192;

[0075] Therefore, 1.92E-05 is equal to 0.0000192.

[0076] The coefficients of the second space curve M2 in formula (2) are as follows:

[0077] a=1.53E+02; b=8.83E-01; c=-5.53E-03; d=1.79E-05; e=-3.63E-08; f=3.25E-11;

[0078] The coefficients of the second space curve M2 in formula (3) are as follows:

[0079] a=-5.83E+04; b=-4.16E+02; c=7.67E+02; d=6.56E-01; e=-3.09E+00; f=-1.85E-04; g=3.74E-03;

[0080] The coefficients of the third space curve M3 in formula (2) are as follows:

[0081] a=1.43E+02; b=8.63E-01; c=-5.04E-03; d=1.56E-05; e=-3.06E-08; f=2.64E-11;

[0082] The coefficients of the third space curve M3 in formula (3) are as follows:

[0083] a=3.56E+03; b=2.49E+01; c=-4.38E+01; d=-4.73E-02; e=1.55E-01; f=1.80E-05; g=-1.35E-04; h=-1.82E-01; i=1.86E-04; j=3.33E-04.

[0084] The coefficients of the fourth space curve M4 in formula (2) are as follows:

[0085] a=1.32E+02; b=8.55E-01; c=-4.75E-03; d=1.48E-05; e=-2.90E-08; f=2.44E-11;

[0086] For the fourth space curve M4, the coefficients in formula (3) are as follows:

[0087] a=1.42E+03; b=1.01E+01; c=-1.63E+01; d=-2.36E-02; e=4.67E-02; f=1.14E-05; g=-9.69E-06;

[0088] The coefficients of the fifth space curve M5 in formula (2) are as follows:

[0089] a=1.21E+02; b=8.39E-01; c=-4.29E-03; d=1.27E-05; e=-2.38E-08; f=1.88E-11;

[0090] The coefficients of the fifth space curve M5 in formula (3) are as follows:

[0091] a=1.39E+03; b=1.56E+01; c=-1.54E+01; d=-1.47E-02; e=1.58E-02; f=-7.43E-06;

[0092] g=1.57E-04; h=-1.23E-01; i=1.05E-04; j=1.81E-04.

[0093] The coefficients of the sixth space curve M6 in formula (2) are as follows:

[0094] a=1.11E+02; b=8.25E-01; c=-3.90E-03; d=1.12E-05; e=-2.02E-08; f=1.50E-11;

[0095] The coefficients of the sixth space curve M6 in formula (3) are as follows:

[0096] a=1.34E+03; b=2.62E+01; c=-1.07E+01; d=1.92E-02; e=-9.92E-02; f=-8.02E-05;

[0097] g=7.91E-04; h=-2.17E-01; i=1.94E-04; j=3.52E-05.

[0098] Among them, after the first space curve M1, the second space curve M2, the third space curve M3, the fourth space curve M4, the fifth space curve M5 and the sixth space curve M6 are generated, the three-dimensional blade 22 is swept and formed by these six space curves (the present invention also refers to the three-dimensional blade as a "three-dimensional backward blade formed by straight sweeping"), and finally a three-dimensional blade with a multi-curved surface shape is obtained, and the remaining three-dimensional blades are obtained by copying the circular array with the "formed three-dimensional blade" as the source object. The three-dimensional blade 22 of the present invention is a multi-curved surface shape, which effectively reduces flow loss, effectively reduces the influence of separation flow, vortex and secondary flow, effectively improves the working efficiency of the fan, and effectively reduces the working noise of the fan.

[0099] Reference Figures 1 to 13 In one embodiment, the center K1 of the front of the rear disc 231 is the center of the circular array N, and a plurality of three-dimensional blades 22 are arranged on the rear disc meridian acceleration guide body 23 in a circular array with the center of the circular array N as the center. The three-dimensional blades 22 with multiple curved surfaces can be evenly arranged between "the rear disc meridian acceleration guide body 232 and the front disc 21", so that each flow channel 26 can achieve equal area expansion, so that the secondary flow cannot be fully formed, the working performance of the centrifugal fan is improved, and various working losses are reduced.

[0100] Reference Figures 1 to 13 Preferably, the number of the three-dimensional blades 22 is sixteen, which is more in line with the need for high-efficiency operation of the centrifugal fan.

[0101] Reference Figures 1 to 13 In one embodiment, a center P1 of a plane circle P is set on the central axis S1 of the rear plate meridian acceleration guide body 23, and a plane distance from the center P1 to the leading edge 221 of the three-dimensional blade 22 is a radius R2 of the plane circle P. The contact position between the leading edge 221 of the three-dimensional blade 22 and the plane circle P is defined as a tangent point, and a tangent line Q of the plane circle P is made through the tangent point. The space angle formed by the tangent line Q and the leading edge 221 of the three-dimensional blade 22 is an inlet attack angle T (specifically combined with Figure 6 , Fig.12 and Fig.13 The inlet angle of attack at different positions of the leading edge 221 of the three-dimensional blade 22 is different. Specifically, the inlet angle of attack of the leading edge 221 of the three-dimensional blade 22 increases gradually from the direction of the rear disc meridian acceleration guide body 23 to the direction of the front disc 21 (combined with Fig.12 H direction in the figure), and the inlet angle of attack is controlled within the range of 24° to 27°. Wherein, the plane circle P is an auxiliary circle, and the tangent line Q is an auxiliary line, which is a dotted line made to facilitate people to understand the inlet angle of attack T. Wherein, the inlet angle of attack "gradiently increases from the rear disk meridian acceleration guide body 23 to the front disk direction", and the inlet angle of attack is controlled within the range of 24° to 27°, which has a design purpose: when the gas enters the leading edge 221 of the three-dimensional blade 22, the gas collides with the leading edge 221 of the three-dimensional blade 22, and finally the gas is diverted by the leading edge 221 of the three-dimensional blade 22. The present invention creatively utilizes the "gradient increasing change" of the inlet angle of attack of the leading edge 221 of the three-dimensional blade 22, so that after the gas impacts the leading edge 221 of the three-dimensional blade 22, it forms a "uniformly separated" gas, thereby reducing the impact loss of the centrifugal fan.

[0102] Reference Figures 1 to 13 (For details, see Fig.11 and Fig.12 ), in one embodiment, the meridian acceleration guide plate 232 has a mounting hole W; the sleeve 24 is arranged in the mounting hole W, and the front end 241 of the sleeve 24 and the front end V of the meridian acceleration guide plate 232 are transitioned by welding (smoothly or roundedly), and the transition is conducive to gas diversion. Among them, the sleeve 24 has a connecting hole 242, and the connecting hole 242 is used for sealing and connecting with the power shaft. Preferably, a plurality of the reinforcement members 25 are evenly arranged on the outer circumference of the sleeve 24 (see Figure 7 and Figure 8 ) to better strengthen the connection between the shaft sleeve 24 and the rear plate meridian acceleration guide body 23. Preferably, eight reinforcement members 25 are arranged.

[0103] Reference Figures 1 to 13 In one embodiment, the reinforcement 25 has an arcuate side 251 and a vertical side 252; the arcuate side 251 is adapted to the arcuate shape of the meridian acceleration guide plate 232, and the vertical side 252 is adapted to the shaft body of the sleeve 24, so that the reinforcement 25 can be better welded and fixed.

[0104] Reference Figures 1 to 13 (For details, see Figure 6 and Fig.12), in one embodiment, the front plate 21 comprises an outer flat ring plate 211, a first curved plate 212 and a second curved plate 213; the outer flat ring plate 211, the first curved plate 212 and the second curved plate 213 are sequentially connected together; the outer flat ring plate 211, the first curved plate 212 and the second curved plate 213 are integrally formed, and this design is conducive to ensuring the strength of the front plate 21. Preferably, the arc radius R3 of the first curved plate 212 is 360 mm; the arc radius R4 of the second curved plate 213 is 80 mm.

[0105] Reference Figures 1 to 13 In one embodiment, the front disc 21 has an impeller air inlet 214, and the impeller air inlet 214 is connected to the flow channel 26; after the impeller device 2 is assembled, the central axis S2 of the impeller air inlet 214, the central axis S3 of the sleeve 24, and the central axis S1 of the rear disc meridian acceleration guide body 23 coincide with each other, and this design is conducive to the impeller device 2 to better achieve fluid diversion. Preferably, the diameter D1 of the impeller air inlet 214 is 310 mm.

[0106] Reference Figures 1 to 13 In one embodiment, the three-dimensional flow impeller centrifugal fan 1 also includes a fan housing 3; the impeller device 2 is rotatably arranged in the fan housing 3, wherein the shaft sleeve 24 is used to connect with the power shaft, and the power shaft can drive the impeller device 2 to rotate in the fan housing 3; the fan housing 3 includes a main shell 31 and an air inlet duct assembly 32; the air inlet duct assembly 32 is arranged on the main shell 31 for air intake; the air inlet duct assembly 32 has a shell air inlet A, and the shell air inlet A is connected to the impeller air inlet 214 and the flow channel 26; the impeller device 2 is arranged in the main shell 31, and the front disk 21 and the air inlet duct assembly 32 maintain a set small gap.

[0107] Reference Figures 1 to 13In one embodiment, the air inlet assembly 32 includes a deflector 321 and a fixing plate 322; the deflector 321 is arranged on the fixing plate 322, and is arranged on the main shell 31 through the fixing plate 322. Preferably, the main shell 31 has a mounting opening, and the deflector 321 passes through the fixing plate 322 and is covered on the mounting opening. Preferably, the deflector 321 has the shell air inlet A, and the shell air inlet A is a shell air inlet with a variable diameter. The shell air inlet at the outer position of the deflector 321 has a large diameter (preferably a diameter of 302 mm), the shell air inlet at the middle position has a smaller diameter than the shell air inlet at the outer position, and the shell air inlet at the inner side has a diameter (preferably a diameter of 302 mm) larger than the shell air inlet at the middle position. Preferably, the front disk 21 and the air deflector 321 maintain a set small gap. Specifically, in the y-coordinate direction, the front disk 21 and the air deflector 321 maintain a gap of 1 mm, and in the z-coordinate direction, the front disk 21 and the air deflector 321 maintain a gap of 6 mm to 8 mm.

[0108] Reference Figures 1 to 13 In one embodiment, the main housing 31 has an air outlet 311; the air outlet 311 is connected to the flow channel 26; the housing side plate 312 at the air outlet 311 forms an angle C of 10° to 15° with the middle longitudinal plane B of the air outlet 311. Preferably, there are two housing side plates 312, each of which forms an angle C of 12° with the middle longitudinal plane B of the air outlet.

[0109] In one embodiment, the present invention controls the velocity distribution of the internal flow channel when the fan is running by optimizing the structure of the impeller device 2, thereby reducing the loss caused by the secondary flow and stratification effect. The three-dimensional blade 22 of the present invention is designed as a multi-curved shape, and the blade shape is more adapted to the actual flow state of the fluid, effectively reducing the flow loss and effectively reducing the influence of the separated flow, vortex and secondary flow.

[0110] Reference Fig.14 In one embodiment, the present invention is combined with computational fluid dynamics (CFD) software for analysis. The velocity distribution area F is a high-speed area of ​​gas flow, where obvious airflow separation can be seen. After the airflow separates, it quickly separates from the three-dimensional blade 22 of the impeller device 2, enters the main housing 31, and flows along the internal channel of the main housing 31 toward the air outlet 311. This separated area (i.e. Fig.14The velocity distribution area F) is far away from the inlet of the flow channel 26 at the leading edge 221 of the three-dimensional blade 22, which makes the flow channel 26 "along the leading edge of the three-dimensional blade to the tail of the three-dimensional blade" have no obvious negative pressure area, no obvious vortex and secondary flow generation, which reduces the flow loss in the flow channel 26 of the impeller device 2 and improves the working efficiency of the centrifugal fan. Among them, after the airflow separates at the tail of the three-dimensional blade 22, it immediately forms a high-speed area and quickly leaves the impeller device 2, which minimizes the separation loss in the flow channel 26 of the impeller device 2.

[0111] In one embodiment, the three-dimensional blade 22 of the present invention is suitable for high-speed operation, which greatly reduces the separation loss inside the flow channel 26 of the impeller device 2. The inlet attack angle of the leading edge 221 of the three-dimensional blade 22 of the present invention "gradiently increases from the direction of the meridian acceleration guide body of the rear disc to the front disc", and the inlet attack angle is controlled within the range of 24° to 27°, so that after the incoming flow impacts the leading edge 221 of the three-dimensional blade 22, a "uniformly separated" airflow is formed, reducing the impact loss. The flow channel 26 of the present invention belongs to equal-area expansion, and the secondary flow cannot be fully formed, further reducing the influence of the secondary flow. The present invention uses metal materials to make the whole machine, and has carried out performance testing. The test results show that: when running at a speed of 2950rpm, the noise in the high-efficiency zone is not higher than 91 decibels (effectively reducing the working noise of the fan); the overall working efficiency of the impeller device 2 of the present invention is 2 to 3 percentage points higher than that of the centrifugal fan designed using the binary design theory.

[0112] For other contents of the three-dimensional flow impeller centrifugal fan described in the present invention, please refer to the prior art and will not be repeated here.

[0113] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A three-dimensional flow impeller centrifugal fan, characterized in that: The invention comprises an impeller device, which comprises a front disk, a plurality of three-dimensional blades, a rear disk meridian acceleration guide body, a shaft sleeve and a reinforcement member; the shaft sleeve is arranged at a set position of the rear disk meridian acceleration guide body, and the shaft sleeve is connected to the rear disk meridian acceleration guide body through the reinforcement member; the rear disk meridian acceleration guide body is connected to the front disk through the three-dimensional blades; a plurality of the three-dimensional blades are located between the rear disk meridian acceleration guide body and the front disk, and a flow channel for fluid to pass through is formed between adjacent three-dimensional blades.

2. The three-dimensional impeller centrifugal fan according to claim 1, characterized in that: The rear plate meridian acceleration guide body comprises a rear plate and a meridian acceleration guide plate; the rear plate is a flat plate having a front side and a back side; the meridian acceleration guide plate is an arc-shaped plate; the rear plate and the meridian acceleration guide plate are connected together and are integrally formed.

3. The three-dimensional impeller centrifugal fan according to claim 2, characterized in that: The shape of the three-dimensional blade is controlled and formed by a plurality of space curves.

4. The three-dimensional impeller centrifugal fan according to claim 3, characterized in that: The blade shape of the three-dimensional blade is controlled by six space curves, and each space curve is generated by the following control equation; The governing equations include the following formula: X＝0～360.3； Y=a+bX 1 +cX 2 +dX 3 +eX 4 +fX 5 ; Z=a+bX+cY+dX 2 +eY 2 +fX 3 +gY 3 +hXY+iX 2 Y+jXY 2 ; Among them, X is the parameter of the x coordinate of the spatial rectangular coordinate system xyz, Y is the parameter of the y coordinate of the spatial rectangular coordinate system xyz, and Z is the parameter of the z coordinate of the spatial rectangular coordinate system xyz; the xoy plane of the spatial rectangular coordinate system xyz coincides with the front face of the rear disc; the origin o of the spatial rectangular coordinate system xyz is located at the center of the front face of the rear disc; the positive direction of the z coordinate of the spatial rectangular coordinate system xyz extends "from the rear disc to the front disc direction"; a, b, c, d, e, f, g, h, i, and j are coefficients.

5. The three-dimensional impeller centrifugal fan according to claim 2, characterized in that: The center of the front side of the rear disc is taken as the center of the circular array, and a plurality of three-dimensional blades are distributed in a circular array with the center of the circular array as the center of the circle, and are arranged on the rear disc meridian acceleration guide body.

6. The three-dimensional impeller centrifugal fan according to claim 1, characterized in that: Assume that the center of a plane circle is on the central axis of the rear disk meridian acceleration guide body, the plane distance from the center of the circle to the leading edge of the three-dimensional blade is the radius of the plane circle, the contact position between the leading edge of the three-dimensional blade and the plane circle is defined as the tangent point, a tangent line of the plane circle is drawn through the tangent point, and the spatial angle formed by the tangent line and the leading edge of the three-dimensional blade is an inlet angle of attack; the inlet angle of attack of the leading edge of the three-dimensional blade increases gradually "from the rear disk meridian acceleration guide body to the front disk direction", and the inlet angle of attack is controlled within the range of 24° to 27°.

7. The three-dimensional impeller centrifugal fan according to claim 2, characterized in that: The meridian acceleration guide plate has a mounting hole; the shaft sleeve is arranged in the mounting hole, and the front end of the shaft sleeve and the front end of the meridian acceleration guide plate are transitioned by welding.

8. The three-dimensional impeller centrifugal fan according to claim 1, characterized in that: The front plate includes an outer flat ring plate, a first arc panel and a second arc panel; the outer flat ring plate, the first arc panel and the second arc panel are connected together in sequence; the outer flat ring plate, the first arc panel and the second arc panel are integrally formed.

9. The three-dimensional flow impeller centrifugal fan according to any one of claims 1 to 8, characterized in that: The three-dimensional flow impeller centrifugal fan also includes a fan casing; the impeller device is rotatably arranged in the fan casing, wherein the sleeve is used to connect with the power shaft; the fan casing includes a main shell and an air inlet duct assembly; the air inlet duct assembly is arranged on the main shell for intake of air; the air inlet duct assembly has a shell air inlet, and the shell air inlet is connected to the flow channel; the impeller device is arranged in the main shell, and the front disk maintains a set gap with the air inlet duct assembly.

10. The three-dimensional impeller centrifugal fan according to claim 9, characterized in that: The main shell has an air outlet; the air outlet is communicated with the flow channel; the shell side plate at the air outlet forms an angle of 10° to 15° with the middle longitudinal plane of the air outlet.

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