Centrifugal fan

Abstract

The utility model discloses a centrifugal fan which comprises a rack, a motor, a volute and an impeller, wherein the volute is provided with an air inlet and an air outlet. The impeller comprises a front disc, blades and a rear disc, the multiple blades are distributed between the front disc and the rear disc in a circumferential array mode, the two sides of each blade are connected with the front disc and the rear disc respectively, a pressurization channel is formed between every two adjacent blades, one end of each pressurization channel is an inlet, and the other end of each pressurization channel is an outlet. The blade is of an S-shaped structure in appearance and comprises a first arc section and a second arc section which are connected with each other, the first arc section is of an outwards-convex structure and is close to the inlet, and the second arc section is of an inwards-concave structure and is close to the outlet. According to the centrifugal fan, the appearance, the inlet angle and the outlet angle of the blades are optimized, so that the impeller has better aerodynamic efficiency, the efficiency of the centrifugal fan is high, the first-level energy efficiency standard of the national standard of the fan is met, more energy and electricity are saved, and the performance of the whole fan is more excellent.

Description

Technical Field

[0001] The utility model belongs to the technical field of fans and relates to a centrifugal fan. Background Art

[0002] A fan is a ventilation and blowing device, which is widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings, and ventilation and air induction of boilers and industrial furnaces. At present, the blades of the impeller of the existing centrifugal fans are generally single arc-shaped. For example, a centrifugal fan disclosed in Chinese utility model patent application No. 2014105622097 has a single arc-shaped impeller blade. The shortcomings of this centrifugal fan are: 1.

[0003] The impeller does not do very good work on the gas, the fan efficiency is not ideal, and the fan power consumption is high; 2. The extended section of the volute tongue on the upper side of the volute outlet duct is a straight structure. When the high-speed airflow is discharged through the outlet duct, the deflection is not complete and vortexes are easily generated, which increases the flow loss of the airflow, reduces the overall efficiency of the fan, and causes relatively high noise. Utility Model Content

[0004] The purpose of the utility model is to provide a centrifugal fan to solve the above technical problems.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a centrifugal fan, including a frame, a motor, a volute with an air inlet and an air outlet, and an impeller;

[0006] The impeller comprises a front disk, blades and a rear disk, a plurality of blades are distributed in a circumferential array between the front disk and the rear disk, two sides of the blades are respectively connected to the front disk and the rear disk, a pressurized channel is formed between two adjacent blades, one end of the pressurized channel is an inlet, and the other end is an outlet;

[0007] The blade has an S-shaped appearance and includes a first arc segment and a second arc segment connected to each other. The first arc segment has an outward convex structure and is close to the inlet, and the second arc segment has an inward concave structure and is close to the outlet.

[0008] Furthermore, the end of the blade close to the inlet is the inner end, and the end of the blade close to the outlet is the outer end. The largest circle formed by the inner ends of several blades is the inner large circle, and the diameter of the inner large circle is D1. The largest circle formed by the outer ends of several blades is the outer large circle, and the diameter of the outer large circle is D2. The inner circle radius of the first arc segment is R1, R1=0.5×D2, and the inner circle radius of the second arc segment is R2, R2=2.15×D2.

[0009] Furthermore, the diameter D2 of the outer large circle is Φ1000 mm.

[0010] Furthermore, the wind inlet tangent of the outer circular surface of the first circular arc segment of the blade at the inner end of the blade is the first tangent, the tangent of the inner large circle at the intersection of the first tangent and the inner large circle is the second tangent, the angle between the first tangent and the second tangent is the inlet angle, and the inlet angle is set to 28°±1°; the wind outlet tangent of the inner circular surface of the second circular arc segment of the blade at the outer end of the blade is the third tangent, the tangent of the outer large circle at the intersection of the third tangent and the outer large circle is the fourth tangent, the angle between the third tangent and the fourth tangent is the outlet angle, and the outlet angle is set to 53°±1°.

[0011] Furthermore, the inlet angle is 28°, and the outlet angle is 53°.

[0012] Furthermore, the sixteen blades are distributed in a circular array between the front disk and the rear disk.

[0013] Furthermore, an air outlet duct is provided in the volute, one end of the air outlet duct is connected to the air outlet, a volute tongue extension section is provided at the upper side of the air outlet duct on the volute, the volute tongue extension section includes a third arc section and a first straight section connected to each other, the third arc section is an upward convex structure, the first straight section is close to the air outlet, and a second straight section is provided at the lower side of the air outlet duct on the volute, and the first straight section and the second straight section are parallel to each other.

[0014] Furthermore, the volute includes a main shell, a rear panel and a front panel, the main shell is located between the rear panel and the front panel, and two sides of the main shell are respectively connected to the rear panel and the front panel.

[0015] Furthermore, a first flange and a second flange extending outward are respectively provided at the upper and lower sides of the air outlet on the main shell, a third flange extending outward is provided at the air outlet on the rear panel, and a fourth flange extending outward is provided at the air outlet on the front panel, and the first flange, the second flange, the third flange and the fourth flange form an air outlet flange.

[0016] Furthermore, the rear panel and the front panel have a heptagonal shape.

[0017] Beneficial effects of the utility model: Advantages of the centrifugal fan of the utility model: the blades of the impeller are S-shaped, realizing a double arc transition, and the inlet angle and the outlet angle of the blade are optimized, so that the impeller has better aerodynamic efficiency, and the impeller has higher efficiency in doing work on the gas, which improves the efficiency of the centrifugal fan of the utility model, and the fan efficiency reaches the national standard "first-level energy efficiency" standard, which is more energy-saving and power-saving; the volute tongue extension section of the volute is optimized, and an arc diffusion structure is adopted, so that the high-speed airflow in the volute can be smoothly turned and output in a straight line, which changes the previous single-line diffusion output, weakens the generation of vortex, reduces gas flow loss, improves the overall efficiency of the fan, reduces the noise of the fan, and improves the overall performance of the fan; the panel of the volute adopts a polygonal (non-arc) design, and the shape is more unique and novel, and the entire centrifugal fan looks beautiful and generous; the air outlet flange of the volute is formed by integrally bending the main shell, rear panel and front panel of the volute, respectively, without welding, so it is not easy to have defects such as deformation and air holes, which greatly improves the flatness and structural strength of the air outlet flange. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a first stereoscopic view of the centrifugal fan according to an embodiment of the utility model.

[0019] Figure 2 It is a second stereoscopic view of the centrifugal fan according to the embodiment of the utility model.

[0020] Figure 3 It is a front view of the centrifugal fan of the embodiment of the utility model.

[0021] Figure 4 yes Figure 3 Left view of .

[0022] Figure 5 yes Figure 3 Rear view of.

[0023] Figure 6 It is a three-dimensional diagram of the impeller.

[0024] Figure 7 This is the front view of the impeller.

[0025] Figure 8 yes Figure 7 Left view of .

[0026] Fig. 9 yes Figure 8 Sectional view of AA.

[0027] Fig.10 It is a schematic diagram of the longitudinal section of the blade.

[0028] Fig.11 It is a three-dimensional diagram of the volute.

[0029] Fig.12 This is the front view of the volute.

[0030] Fig.13 This is the right side view of the volute.

[0031] Fig.14 yes Fig.13 Middle BB section view.

[0032] Fig.15 yes Fig.14 Magnified view of H.

[0033] Description of reference numerals:

[0034] Frame 1, motor support base 2, motor 3, impeller 4, volute 5;

[0035] Angle reinforcement rib 11;

[0036] A first side surface 111, a second side surface 112, and a hoisting hole 113;

[0037] Rear disc 41, blades 42, front disc 43, inlet 44, outlet 45, pressurized passage 46;

[0038] A first arc segment 421, a second arc segment 422, an inner end 423, and an outer end 424;

[0039] Air inlet 51, air outlet 52, volute tongue extension 53, main shell 54, rear panel 55, front panel 56, air outlet 57, air inlet cover 58, long hole 59;

[0040] A third arc segment 531 and a first straight segment 532;

[0041] A first flange 541, a second flange 542, and a second straight section 543;

[0042] The third flange 551;

[0043] Fourth flange 561 . DETAILED DESCRIPTION

[0044] The following will be combined with the drawings of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0045] like Figure 1-5As shown, the centrifugal fan of this embodiment includes a frame 1, a motor 3, a volute 5 with an air inlet 51 and an air outlet 52, and an impeller 4. The frame 1 is welded with C-shaped steel, and the volute 5 is installed on the frame 1. Figure 2 and Figure 5 A transversely arranged angle reinforcement rib 11 is welded at the back of the volute 5 on the frame 1, and the cross section of the angle reinforcement rib 11 is The angle reinforcement rib 11 is processed with a first side surface 111 and a second side surface 112, the first side surface 111 and the second side surface 112 are perpendicular to each other, and a hoisting hole 111 is processed on the angle reinforcement rib 11, and both ends of the hoisting hole 111 extend to the first side surface 111 and the second side surface 112 of the angle reinforcement rib 11 respectively. A motor support seat 2 with an equilateral trapezoidal structure is welded on the frame 1, the motor 3 is mounted on the motor support seat 2, and the impeller 4 is mounted on the rotating shaft of the motor 3 and is located in the volute 5.

[0046] Reference Figure 6-8 The impeller 4 includes a front disc 43, blades 42 and a rear disc 41. The rear disc 41 is mounted on the rotating shaft of the motor 3. Sixteen blades 42 are evenly distributed between the front disc 43 and the rear disc 41 in a circular array. Both sides of the blades 42 are connected to the front disc 43 and the rear disc 41 respectively. Fig. 9 A pressurizing channel 46 is formed between two adjacent blades 42 , one end of the pressurizing channel 46 is an inlet 44 , and the other end is an outlet 45 .

[0047] Reference Fig.10 The outer shape of the blade 42 is an "S"-shaped structure. The blade 42 includes a first arc segment 421 and a second arc segment 422 connected to each other. The first arc segment 421 is an outward convex structure and is close to the inlet 44, and the second arc segment 422 is an inward concave structure and is close to the outlet 45. The end of the blade 42 close to the inlet 44 is the inner end 423, and the end of the blade 42 close to the outlet 45 is the outer end 424. The largest circle formed by the inner ends 423 of the sixteen blades 42 is the inner large circle, and the diameter of the inner large circle is D1. The largest circle formed by the outer ends 424 of the sixteen blades 42 is the outer large circle, and the diameter of the outer large circle is D2. The inner circle radius of the first arc segment 421 is R1, R1 = 0.5 × D2, and the inner circle radius of the second arc segment 422 is R2, R2 = 2.15 × D2. Preferably, the diameter D2 of the outer large circle is designed to be Φ1000 mm, then the inner radius of the first arc segment 421 is R1=0.5×1000=500 mm, and the inner radius of the second arc segment 422 is R2=2.15×1000=2150 mm.

[0048] Reference Figure 11-14The volute 5 has an air outlet 57, one end of which is connected to the air outlet 52, and the other end is connected to the inner cavity of the volute 5. The upper side of the air outlet 57 on the volute 5 is processed with a volute tongue extension section 53, referring to Fig.15 The volute tongue extension section 53 includes a third arc section 531 and a first straight section 532 connected to each other, the third arc section 531 is an upward convex structure, and the first straight section 532 is close to the air outlet 52. A second straight section 543 is processed at the lower side of the air outlet 57 on the volute 5, and the first straight section 532 and the second straight section 543 are parallel to each other.

[0049] In a preferred design, the volute 5 includes a main housing 54, a rear panel 55 and a front panel 56. The rear panel 55 and the front panel 56 are heptagonal in shape. The main housing 54 is located between the rear panel 55 and the front panel 56, and the two sides of the main housing 54 are welded to the rear panel 55 and the front panel 56 respectively. Fig.11 The front panel 56 is provided with an air inlet cover plate 58, which is an integrated structure, and an air inlet 51 is processed in the middle of the air inlet cover plate 58. Fig.13 The upper and lower sides of the air outlet 52 on the main shell 54 are respectively processed with a first flange 541 and a second flange 542 extending outwards, and the two ends of the first flange 541 are respectively in contact with the rear panel 55 and the front panel 56, and the two ends of the second flange 542 are also respectively in contact with the rear panel 55 and the front panel 56. The air outlet 52 on the rear panel 55 is processed with a third flange 551 extending outwards. The air outlet 52 on the front panel 56 is processed with a fourth flange 561 extending outwards. The first flange 541, the second flange 542, the third flange 551 and the fourth flange 561 form an air outlet flange, and the air outlet flange is processed with a plurality of elliptical long holes 59 with the same hole spacing, and the horizontal center lines of these long holes 59 are arranged horizontally, that is, the arrangement direction of the long holes 59 is consistent.

[0050] Preferred design solution, refer to Fig. 9 , the wind inlet tangent of the outer circular surface of the first arc segment 421 of the blade 42 at the inner end 423 of the blade 42 is the first tangent L1, the tangent of the inner large circle at the intersection of the first tangent L1 and the inner large circle is the second tangent L2, the angle between the first tangent L1 and the second tangent L2 is the inlet angle E, and the inlet angle E is set to 28°±1°. In the preferred design, the inlet angle E is designed to be 28°. The wind outlet tangent of the inner circular surface of the second arc segment 422 of the blade 42 at the outer end 424 of the blade 42 is the third tangent L3, the tangent of the outer large circle at the intersection of the third tangent L3 and the outer large circle is the fourth tangent L4, the angle between the third tangent L3 and the fourth tangent L4 is the outlet angle F, and the outlet angle F is set to 53°±1°. In the preferred design, the outlet angle F is designed to be 53°.

[0051] For the centrifugal fan of this embodiment, when the diameter D2 of the outer large circle is designed to be Φ1000mm, the inner radius R1 of the first arc segment 421 of the blade 42 is 500mm, the inner radius R2 of the second arc segment 422 of the blade 42 is 2150mm, the inlet angle E is designed to be 28°, and the outlet angle F is designed to be 53°. In actual tests, the efficiency of the centrifugal fan of this embodiment reaches 88%, meeting the national standard "first-level energy efficiency" standard for fans.

[0052] The advantages of the centrifugal fan of the utility model are as follows:

[0053] 1. The blades of the impeller are S-shaped, realizing double arc transition, and the inlet angle and outlet angle of the blade are optimized, so that the impeller has better aerodynamic efficiency, the impeller has higher efficiency in doing work on the gas, and the efficiency of the centrifugal fan of the utility model is improved. The fan efficiency reaches the national standard "first-level energy efficiency" standard, which is more energy-saving and power-saving;

[0054] 2. The volute tongue extension section of the volute is optimized and adopts an arc diffusion structure. The high-speed airflow in the volute can be smoothly turned and output in a straight line, which is different from the previous single straight line diffusion output, weakening the generation of vortex, reducing airflow loss, improving the overall efficiency of the fan, reducing the noise of the fan, and improving the overall performance of the fan;

[0055] 3. The panel of the volute adopts a polygonal (non-arc) design, which is more unique and novel, and the entire centrifugal fan looks beautiful and generous;

[0056] 4. The air outlet flange of the volute is formed by bending the main shell, rear panel and front panel of the volute in an integrated manner. No welding is required, so it is not easy to have defects such as deformation and air holes, which greatly improves the flatness and structural strength of the air outlet flange;

[0057] 5. The frame is welded with C-shaped steel, and the two sides of the C-shaped steel are beveled and wrapped, with good rigidity, no sharp corners, safe and beautiful;

[0058] 6. The motor support base is designed as an equilateral trapezoidal structure. The rigidity of the motor support base is higher, the support of the motor is more reliable and stable, and the vibration of the centrifugal fan is reduced.

[0059] 7. The frame is equipped with angle reinforcement ribs with a large reinforcement area, which improves the overall strength of the frame. The lifting holes on the angle reinforcement ribs are double-layered, which can withstand large lifting force and is not easy to deform;

[0060] 8. The air inlet cover is an integrated structure, which makes it easy to install the air inlet cover, and the air intake is smoother, thereby improving the air intake efficiency.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A centrifugal fan, comprising a frame (1), a motor (3), a volute (5) provided with an air inlet (51) and an air outlet (52), and an impeller (4); The impeller (4) comprises a front disk (43), blades (42) and a rear disk (41), wherein a plurality of blades (42) are distributed in a circular array between the front disk (43) and the rear disk (41), and both sides of the blades (42) are respectively connected to the front disk (43) and the rear disk (41), and a pressurizing channel (46) is formed between two adjacent blades (42), and one end of the pressurizing channel (46) is an inlet (44), and the other end is an outlet (45), and the characteristics are: The blade (42) has an S-shaped appearance, and comprises a first circular arc segment (421) and a second circular arc segment (422) which are connected to each other, wherein the first circular arc segment (421) has an outwardly convex structure and is close to the inlet (44), and the second circular arc segment (422) has an inwardly concave structure and is close to the outlet (45).

2. The centrifugal fan according to claim 1, characterized in that: The end of the blade (42) close to the inlet (44) is the inner end (423), and the end of the blade (42) close to the outlet (45) is the outer end (424). The largest circle formed by the inner ends (423) of a plurality of blades (42) is the inner large circle, and the diameter of the inner large circle is D1. The largest circle formed by the outer ends (424) of a plurality of blades (42) is the outer large circle, and the diameter of the outer large circle is D2. The inner circle radius of the first arc segment (421) is R1, and R1=0.5×D2. The inner circle radius of the second arc segment (422) is R2, and R2=2.15×D2.

3. The centrifugal fan according to claim 2, characterized in that: The diameter D2 of the outer large circle is Φ1000 mm.

4. The centrifugal fan according to claim 2, characterized in that: The wind inlet tangent of the outer circular surface of the first arc segment (421) of the blade (42) at the inner end (423) of the blade (42) is the first tangent (L1), the tangent of the inner large circle at the intersection of the first tangent (L1) and the inner large circle is the second tangent (L2), the angle between the first tangent (L1) and the second tangent (L2) is the inlet angle (E), and the inlet angle (E) is set to 28°±1°; the wind outlet tangent of the inner circular surface of the second arc segment (422) of the blade (42) at the outer end (424) of the blade (42) is the third tangent (L3), the tangent of the outer large circle at the intersection of the third tangent (L3) and the outer large circle is the fourth tangent (L4), the angle between the third tangent (L3) and the fourth tangent (L4) is the outlet angle (F), and the outlet angle (F) is set to 53°±1°.

5. The centrifugal fan according to claim 4, characterized in that: The inlet angle (E) is 28° and the outlet angle (F) is 53°.

6. The centrifugal fan according to claim 1, characterized in that: The sixteen blades (42) are distributed in a circular array between the front disk (43) and the rear disk (41).

7. The centrifugal fan according to claim 1, characterized in that: An air outlet duct (57) is provided in the volute (5), one end of the air outlet duct (57) is connected to the air outlet (52), a volute tongue extension section (53) is provided on the upper side of the air outlet duct (57) on the volute (5), the volute tongue extension section (53) comprises a third circular arc section (531) and a first straight section (532) which are connected to each other, the third circular arc section (531) is an upward convex structure, the first straight section (532) is close to the air outlet (52), and a second straight section (543) is provided on the lower side of the air outlet duct (57) on the volute (5), the first straight section (532) and the second straight section (543) are parallel to each other.

8. The centrifugal fan according to claim 1, characterized in that: The volute (5) comprises a main shell (54), a rear panel (55) and a front panel (56); the main shell (54) is located between the rear panel (55) and the front panel (56); and two sides of the main shell (54) are respectively connected to the rear panel (55) and the front panel (56).

9. The centrifugal fan according to claim 8, characterized in that: A first flange (541) and a second flange (542) extending outward are respectively provided on the upper and lower sides of the air outlet (52) on the main shell (54), a third flange (551) extending outward is provided at the air outlet (52) on the rear panel (55), and a fourth flange (561) extending outward is provided at the air outlet (52) on the front panel (56), and the first flange (541), the second flange (542), the third flange (551) and the fourth flange (561) form an air outlet flange.

10. The centrifugal fan according to claim 8 or 9, characterized in that: The rear panel (55) and the front panel (56) have a heptagonal shape.

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