CN109595197B

CN109595197B - Fan

Info

Publication number: CN109595197B
Application number: CN201811496621.8A
Authority: CN
Inventors: 唐育萍; 徐绍斌
Original assignee: Foshan City Nanhai Popula Fan Co ltd
Current assignee: Foshan City Nanhai Popula Fan Co ltd
Priority date: 2018-12-07
Filing date: 2018-12-07
Publication date: 2023-10-10
Anticipated expiration: 2038-12-07
Also published as: CN109595197A

Abstract

The application discloses a fan, which comprises a shell, wherein a motor is arranged on one end face of the shell, an air inlet is arranged on the other end face of the shell, an air inlet cylinder is arranged in the air inlet, an air outlet is arranged on the peripheral surface of the shell, an impeller is arranged in the shell, the impeller comprises a base plate, blades and a front disc, an air outlet cavity is formed between the base plate and the front disc, the air inlet and the air outlet are communicated with each other, the blades are arc-shaped, the arc center of each blade is arranged in the base plate, the near-center end of each blade is an inlet angle, the telecentric end of each blade is an outlet angle, and the connecting line from the outlet angle to the center of the base plate is a telecentric radius.

Description

Fan

Technical Field

The application relates to a fan.

Background

The traditional fan air inlet mostly adopts conical and small arc-shaped structures, the fluidity and the airflow resistance during air inlet are large, so that the flowing vortex noise of airflow is generated, the front disc of the impeller of the fan also adopts conical and small arc-shaped structures, the small arc-shaped blades and the short flow channels are small in gas energizing opportunity, the air output is small, the airflow resistance is increased by adopting straight-plate type or conical blades, the surging phenomenon is easy to occur by adopting air-out backward inclined blades, the noise during the operation of the fan is increased, the structural stability is poor, a motor with larger power is needed, and the power consumption is increased.

Disclosure of Invention

The application aims to solve the technical problems that: what is needed is a fan that reduces energy consumption, improves air-out efficiency, and reduces noise generated during operation.

The application solves the technical problems as follows: the fan comprises a shell, a motor is arranged on one end face of the shell, an air inlet is arranged on the other end face of the shell, an air inlet cylinder is arranged in the air inlet, an air outlet is arranged on the outer peripheral face of the shell, an impeller is arranged in the shell, the impeller comprises a base plate in transmission connection with the output end of the motor, a plurality of blades distributed on the inner side face of the base plate in a circumferential array manner, a front disc arranged on one side of the blades away from the base plate, an air outlet cavity is formed between the base plate and the front disc, the air inlet and the air outlet are communicated with the air outlet cavity, the blade is circular-arc, the arc center of the blade is in the base plate, the near-center end of the blade is an entrance angle, the telecentric end of the blade is an exit angle, the line from the exit angle to the center of the base plate is a telecentric radius, the diameter of a fitting circle formed by telecentric radius fitting is smaller than the diameter of the base plate, an included angle formed by the tangent line of the exit angle and the perpendicular line of the telecentric radius is A, the range of A is 148-152 degrees, the arc radius of the blade is R, the arc length of the blade is L, the diameter of the base plate is D, and the distance from the arc center of the blade to the center of the base plate is R, R: d=0.45 to 0.47, l: d=0.4 to 0.42, r:d=0.225 to 0.235.

As a further improvement of the above technical solution, a distance between a tangent line of an inlet angle of any one of the blades and a tangent line of an outlet angle of an adjacent blade is a flow channel outlet width, and a value of the flow channel outlet width is d, L: d=2.96.

As a further improvement of the technical scheme, A is 152 degrees.

As a further improvement of the above technical scheme, R: d=0.466.

As a further improvement of the above technical scheme, L: d=0.415.

As a further improvement of the above technical solution, r: d=0.233.

As a further improvement of the above technical solution, the front disc is a revolving body structure, a generatrix of the front disc is arc-shaped, and an outer diameter of the front disc gradually increases along a direction from the front disc to the base plate.

As a further improvement of the technical scheme, the radius of the circular arc of the front disc busbar is M, R: m=2.74.

As a further improvement of the technical scheme, the air inlet cylinder is of a revolving body structure, the bus of the air inlet cylinder comprises a straight section and an arc section connected with one end of the straight section, the circle center of the arc section is arranged outside the air inlet cylinder, and one end of the arc section, far away from the straight section, extends into the front disc.

As a further improvement of the above technical solution, the radius of the arc section is N, R: n=2.74.

The beneficial effects of adopting the further scheme are as follows: the fan resistance is effectively reduced by adopting the spherical arc-shaped fan blades, the flow passage is prolonged, the gas energizing opportunity is increased, the phenomenon that the air outlet backward inclined blades produce surging is avoided, the noise generated during the operation of the fan is reduced, the power consumption is reduced, the front disc and the air inlet cylinder of the fan are also in circular arc-shaped design, the fan resistance is further reduced, the air inlet noise is reduced, the vortex and reflux loss are also reduced, the smooth and efficient air flow passing through the air inlet inner space is ensured, the fan efficiency reaches 88 percent compared with other centrifugal fan products with the same model, the power of a matched motor is low, and the fan is 10-15 percent lower than the noise of the fan of the same type, and the fan can be applied to environmental protection ventilation, spray painting dust removal, oil smoke staticizer matching, waste gas treatment and the like.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is evident that the drawings described are only some embodiments of the application, but not all embodiments, and that other designs and drawings can be obtained from these drawings by a person skilled in the art without inventive effort.

Fig. 1 is a schematic front view of a base plate and a blade according to the present application.

Fig. 2 is a schematic diagram of the overall side view of the present application.

Fig. 3 is a schematic perspective view of the present application.

In the figure: 1-casing, 2-air outlet, 3-wind inlet tube, 4-motor, 5-base plate, 6-blade, 7-front plate, 8-straight section, 9-arc section.

Detailed Description

The conception, specific structure, and technical effects produced by the present application will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, features, and effects of the present application. It is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present application based on the embodiments of the present application. In addition, all connection relationships mentioned herein do not refer to direct connection of the components, but rather, refer to a connection structure that may be better formed by adding or subtracting connection aids depending on the particular implementation. The technical features in the application can be interactively combined on the premise of no contradiction and conflict.

Referring to fig. 1, 2 and 3, a fan comprises a casing 1, a motor 4 is arranged on one end face of the casing 1, an air inlet is arranged on the other end face of the casing 1, an air inlet cylinder 3 is arranged in the air inlet, an air outlet 2 is arranged on the outer peripheral face of the casing 1, an impeller is arranged in the casing 1, the impeller comprises a substrate 5 in transmission connection with the output end of the motor 4, a plurality of blades 6 distributed on the inner side face of the substrate 5 in a circumferential array manner, a front disc 7 arranged on one side, far away from the substrate 5, of the blades 6, an air outlet cavity is formed between the substrate 5 and the front disc 7, the air inlet and the air outlet 2 are both mutually communicated with the air outlet cavity, the blade 6 is arc-shaped, the arc center of the blade 6 is in the base plate 5, the near-center end of the blade 6 is an entrance angle, the telecentric end of the blade 6 is an exit angle, a connecting line from the exit angle to the center of the base plate 5 is a telecentric radius, the diameter of a fitting circle formed by fitting the telecentric radius is smaller than that of the base plate 5, an included angle formed by a tangent line of the exit angle and a perpendicular line of the telecentric radius is A, the range of A is 148-152 degrees, the arc radius of the blade 6 is R, the arc length of the blade 6 is L, the diameter of the base plate 5 is D, and the distance from the arc center of the blade 6 to the center of the base plate 5 is R, R: d=0.45 to 0.47, l: d=0.4 to 0.42, R: d=0.225 to 0.235, the base plate 5 is driven to rotate by the motor 4, the blades 6 on the base plate 5 rotate in the air outlet cavity between the base plate 5 and the front plate 7, air is introduced into the air outlet cavity from the air inlet cylinder 3 of the air inlet and is discharged from the air outlet 2, the whole blade 6 is designed into a circular arc shape, the design position of the blade 6 on the base plate 5 is required, an included angle formed by a tangent line of an outlet angle and a perpendicular line of a telecentric radius is A, the circular arc radius of the blade 6 is R, the arc length of the blade 6 is L, the diameter of the base plate 5 is D, the distance from the arc center of the blade 6 to the center of the base plate 5 is R, in the numerical limits, the length units are uniform, the value of the circular arc radius R of the blade 6 can be determined according to the ratio of the circular arc radius R of the blade 6 to the diameter D of the base plate 5 within the range of 0.45 to 0.47, according to the ratio of the arc length L of the blade 6 to the diameter D of the base plate 5 within the range of 0.4-0.42, the arc length of the blade 6 can be determined, the position of the blade 6 on the base plate 5 is limited according to the ratio of the distance R to the diameter D of the base plate 5 within the range of 0.225-0.235, the diameter of a fitting circle formed by telecentric radius fitting is smaller than that of the base plate 5, so that the outlet angle is always in the base plate 5, then the swing angle of the blade 6 on the base plate 5 can be determined by limiting the included angle A formed by the tangent line of the outlet angle and the perpendicular line of the telecentric radius within the range of 148-152 degrees, so that the structural arrangement of the blade 6 on the base plate 5 can be determined, the circular arc-shaped blade 6 reduces airflow resistance, avoids the phenomenon of 'surging' generated by the blade 6 after surging, reduces the noise generated during the operation of a fan, the lengthened blade 6 is designed to increase the gas energy increasing opportunity, and the inlet air volume of the gas is increased under the condition that the equal outlet air volume can be obtained, less power is needed by the fan, and high-efficiency air outlet is realized.

Further as a preferred embodiment, the distance between the tangent of the inlet angle of any one of said blades 6 and the tangent of the outlet angle of its adjacent blade 6 is the flow channel outlet width, the value of the flow channel outlet width being d, L: d=2.96, can confirm the quantity that blade 6 set up according to L and d's ratio, and this ratio is provided with 8 under the blade 6, and the structure is more reasonable, further improves the intake.

Further preferred embodiment a is 152 degrees, R: d=0.466, l: d=0.415, r d=0.233, which is the optimal structural design.

Further, as a preferred embodiment, the front disc 7 is a solid of revolution, the generatrix of the front disc 7 is arc-shaped, the outer diameter of the front disc 7 gradually increases along the direction from the front disc 7 to the base plate 5, and the rounded design of the front disc 7 can make the resistance of the air flow entering the blade 6 smaller.

Further as a preferred embodiment, the radius of the arc of the generatrix of the front disc 7 is M, R: m=2.74, which is the structural optimum of the bus bar of the front disc 7, and can achieve more efficient air outlet in cooperation with the blades 6.

Further as preferred embodiment, the air inlet section of thick bamboo 3 is solid of revolution structure, the generating line of air inlet section of thick bamboo 3 include straight section 8, with arc section 9 that straight section 8 one end is connected, the centre of a circle of arc section 9 set up in the outside of air inlet section of thick bamboo 3, arc section 9 keep away from straight section 8's one end stretches into in the front disc 7, straight section of thick bamboo 8's structural design can make air inlet section of thick bamboo 3 install casing 1 more easily, adopts curved air inlet section of thick bamboo 3, can further reduce the noise of intaking, reduces the air current resistance, reduces vortex and backflow loss for the air current is unobstructed high-efficient more when getting into the impeller.

Further as a preferred embodiment, the arc radius of the arc-shaped section 9 is N, R: n=2.74, which is the structural optimum value of the air inlet cylinder 3, and can achieve more efficient air outlet by matching with the blades 6.

In order to further verify the working effect of the fan, a first set of experimental tests are performed, the existing fan impeller adopting the straight plate type and the short flow channel is tested, the fan impeller is connected with 8 air channels, 8 different working conditions are obtained, and experimental data are shown in table 1:

table 1:

circular arc-shaped blades are adopted, and R: d=0.45, which was connected to 8 air ducts to obtain 8 different conditions, and experimental data were shown in table 2:

table 2:

circular arc-shaped blades are adopted, and R: d=0.46, which was connected to 8 air ducts to obtain 8 different conditions, and experimental data were shown in table 3:

table 3:

circular arc-shaped blades are adopted, and R: d=0.466, which was connected to 8 air ducts to obtain 8 different conditions, and experimental data were shown in table 4:

table 4:

circular arc-shaped blades are adopted, and R: d=0.47, which was connected to 8 air ducts to obtain 8 different conditions, and experimental data were shown in table 3:

table 5:

from the above table 1 to table 5, compared with the fan blade of the straight plate type and the short flow channel, after the circular arc-shaped blade is used, the axial static efficiency of the fan is relatively improved, and the impeller power and the sound level of the impeller are relatively reduced, so that the circular arc-shaped blade has higher efficiency than the traditional straight plate type blade, lower power consumption and less noise under the same air output, and further compared with the table 2 to table 5, the following table 2 shows that: d is between 0.45 and 0.466, the axial static efficiency is in an ascending trend, the impeller power is in a descending trend, and the sound level is in a descending trend compared with A, but when R: when D is 0.47, relative R: at D of 0.466, the shaft static efficiency is relatively reduced, the impeller power is relatively increased, and the sound level is substantially unchanged from a, so that when R: d is 0.466, which is the optimum value of the structure.

After maintaining R: on the basis of D being 0.466, changing the ratio of L to D, and carrying out a second group of experimental measurement, taking L: d=0.4, which was connected to 8 air ducts to obtain 8 different conditions, and experimental data were shown in table 6:

table 6:

taking L: d=0.41, which was connected to 8 air ducts to obtain 8 different conditions, and experimental data were shown in table 7:

table 7:

taking L: d=0.415, which was connected to 8 air ducts to obtain 8 different conditions, and experimental data were shown in table 8:

table 8:

taking L: d=0.42, which was connected to 8 air ducts to obtain 8 different conditions, and experimental data were shown in table 9:

table 9:

as can be seen from tables 6 to 9, in L: d is between 0.4 and 0.415, the axial static efficiency is the trend of rising, and impeller power is the trend of decline, and than A sound level is the trend of decline, and the efficiency of fan is the trend of constantly improving, but when L: at D of 0.42, relative L: at D of 0.415, the shaft static efficiency is relatively reduced, the impeller power is relatively increased, and the sound level is substantially unchanged from a, so that when L: d is 0.415, which is the optimum value of the structure.

After maintaining R: d is 0.466, L: on the basis of 0.415, the ratio of R to R is changed, and a third group of experimental measurements are performed, taking R: d=0.225, which was connected to 8 air ducts to obtain 8 different conditions, and experimental data were shown in table 10:

table 10:

taking r, d=0.23, connecting it with 8 air channels to obtain 8 different working conditions, and obtaining experimental data as shown in table 11:

table 11:

taking r, d=0.233, connecting it with 8 air channels to obtain 8 different working conditions, and obtaining experimental data as shown in table 12:

table 12:

taking r, d=0.235, connecting it with 8 air channels to obtain 8 different working conditions, and obtaining experimental data as shown in table 13:

table 13:

as shown in tables 10-13, in the case that r: D is 0.225-0.235, the axial static efficiency is in an increasing trend, the impeller power is in a decreasing trend, the efficiency of the fan is in a continuously increasing trend compared with the A sound level, and the fan efficiency reaches an optimal value theoretically when r: D=0.235 is taken, but in actual production, when r: D=0.235 is taken, the centrifugal force of the blades is large in the high-speed rotation of the impeller due to the position of the blades at the relatively edge of the base plate, the structure is easily unstable, and when r: D=0.223 is taken, the blades keep high air outlet efficiency, the stability of the structure is not influenced, and the impeller is kept in a stable state when rotating, so that r: D=0.233 is taken as an optimal value in terms of comprehensive service life and structural stability.

After maintaining R: d is 0.466, L: d is 0.415, on the basis of r: d=0.233, the range of an included angle a formed by a tangent line of the outlet angle and a perpendicular line of the telecentric radius is changed, a fourth set of experimental measurement is performed, a=148 degrees is taken, the experimental measurement is connected with 8 air channels, 8 different working conditions are obtained, and experimental data are shown in table 14:

table 14:

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taking a=150 degrees, connecting the air duct with 8 air ducts to obtain 8 different working conditions, and obtaining experimental data as shown in table 15:

table 15:

taking a=152 degrees, connecting the air duct with 8 air ducts to obtain 8 different working conditions, and obtaining experimental data as shown in table 16:

table 16:

taking a=153 degrees, connecting the air duct with 8 air ducts to obtain 8 different working conditions, and obtaining experimental data as shown in table 17:

table 17:

as can be seen from tables 14 to 17, the axial static efficiency is increased between 148 and 152 degrees, the impeller power is decreased compared with the sound level A, and the efficiency of the fan is increased continuously, but when A is 153 degrees, the axial efficiency is relatively reduced compared with the sound level A because the total pressure in the impeller is decreased when A is 152 degrees, the impeller power is relatively increased, and the impeller power is basically unchanged compared with the sound level A, so that the axial static efficiency is the optimal value of the structure when A is 152 degrees.

The length units of the above four groups of experiments are unified as CM.

In summary, by combining the experimental measurements of the first to fourth groups, by changing the radian of the blade, the arc length of the blade, the position of the blade on the substrate, and the swing angle of the blade, we obtain the following ratio R: d=0.466, l: d=0.415, r:d=0.233, when a=152 degrees, the structure of the fan impeller reaches the optimum, the fan resistance is effectively reduced, the flow passage is prolonged, the gas energizing opportunity is increased, the phenomenon that the air outlet backward inclined blade produces surging is avoided, the noise produced when the fan runs is reduced, the power consumption is reduced, the front disc and the air inlet cylinder of the fan are designed to be circular arc, and the air inlet cylinder is designed to be circular arc, and the air inlet cylinder comprises the following components: m is 2.74, R: n is 2.74, fan resistance is further reduced, air intake noise is reduced, vortex and backflow losses are reduced, smooth and efficient air flow passing through an air intake inner space is ensured, compared with other centrifugal fan products of the same type, the fan is increased in proportion per hour, the fan efficiency reaches 88%, the power of a matched motor is small, and the noise of the matched motor is 10-15% lower than that of the similar fan, so that the fan can be applied to environment-friendly ventilation, spray painting and dust removal, oil fume silencer matching, waste gas treatment and the like.

While the preferred embodiment of the present application has been described in detail, the application is not limited to the embodiments, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the application, and these modifications and substitutions are intended to be included in the scope of the present application as defined in the appended claims.

Claims

1. A fan, characterized in that: comprises a casing (1), a motor (4) is arranged on one end face of the casing (1), an air inlet is arranged on the other end face of the casing (1), an air inlet cylinder (3) is arranged in the air inlet, an air outlet (2) is arranged on the outer peripheral surface of the casing (1), an impeller is arranged in the casing (1), the impeller comprises a substrate (5) in transmission connection with the output end of the motor (4), a plurality of blades (6) distributed on the inner side face of the substrate (5) in a circumferential array, a front disc (7) arranged on one side, far away from the substrate (5), of the blades (6), an air outlet cavity is formed between the substrate (5) and the front disc (7), the air inlet and the air outlet (2) are communicated with the air outlet cavity, the blade (6) is arc-shaped, the arc center of the blade (6) is arranged in the base plate (5), the near-center end of the blade (6) is an inlet angle, the telecentric end of the blade (6) is an outlet angle, the connecting line from the outlet angle to the center of the base plate (5) is a telecentric radius, the diameter of a fitting circle formed by fitting the telecentric radius is smaller than the diameter of the base plate (5), the included angle formed by the tangent line of the outlet angle and the perpendicular line of the telecentric radius is A, the range of A is 148-152 degrees, the arc radius of the blade (6) is R, the arc length of the blade (6) is L, the diameter of the base plate (5) is D, and the distance from the arc center of the blade (6) to the center of the base plate (5) is R, R: d=0.45 to 0.47, l: d=0.4 to 0.42, r:d=0.225 to 0.235, the distance between the tangent line of the inlet angle of any one blade (6) and the tangent line of the outlet angle of its adjacent blade (6) is the flow channel outlet width, and the value of the flow channel outlet width is D, L: d=2.96, the front disc (7) is a revolving body structure, a generatrix of the front disc (7) is arc-shaped, and the outer diameter of the front disc (7) gradually increases along the direction from the front disc (7) to the base plate (5).

2. A fan as claimed in claim 1, wherein: a is 152 degrees.

3. A fan as claimed in claim 1, wherein: r: d=0.466.

4. A fan as claimed in claim 1, wherein: l: d=0.415.

5. A fan as claimed in claim 1, wherein: r, d=0.233.

6. A fan as claimed in claim 5, wherein: the arc radius of the front disc (7) bus is M, R: m=2.74.

7. A fan as claimed in claim 1, wherein: the utility model discloses a novel air inlet cylinder, including inlet cylinder (3), including straight section (8), with arc section (9) that straight section (8) one end is connected, the centre of a circle of arc section (9) set up in inlet cylinder (3) outside, arc section (9) keep away from the one end of straight section (8) stretches into in front tray (7).

8. A fan as claimed in claim 7, wherein: the arc radius of the arc-shaped section (9) is N, R: n=2.74.