Blade-adjustable energy-saving centrifugal fan device

Abstract

The invention discloses a blade-adjustable energy-saving centrifugal fan device, and relates to the technical field of centrifugal ventilators, the blade-adjustable energy-saving centrifugal fan device comprises a supporting frame, a driving motor is fixedly mounted at the top of the supporting frame, and a first fan shell and a second fan shell are arranged on one side of the driving motor; the first ventilator shell and the second ventilator shell are fixedly installed through bolts and jointly form a shell for protecting the impeller, an output rotating shaft is fixedly installed in one side of the driving motor, and the first ventilator shell and the second ventilator shell are both arranged outside the output rotating shaft. Due to the arrangement of the volute tongue, the arc-shaped plate and the flow guide fan blades, when the centrifugal fan is used, air flow enters the air flow channel formed by the flow guide fan blades through the flow guide channel, and the air flow can flow along the arc side faces of the flow guide fan blades; a high-frequency eddy noise source generated by right-angle deflection is eliminated through curved surface transition, a multi-stage noise reduction structure is formed in cooperation with the gradually-shrunk drainage channel, and the overall noise is reduced.

Description

Technical Field

[0001] This invention relates to the field of centrifugal fan technology, specifically to an energy-saving centrifugal fan device with adjustable blades. Background Technology

[0002] Centrifugal fans are mechanical devices that convert mechanical energy into gas pressure and discharge gas. They are widely used in factories, mines, tunnels and many other places. Their working principle is mainly to accelerate the gas through a high-speed rotating impeller, and then change the flow direction in the diffuser, effectively converting kinetic energy into potential energy.

[0003] During the operation of a centrifugal fan, a special type of noise—vortex noise—is generated due to the interaction between the blades and the casing. When the fan is running, the gap between the blades and the casing generates a rotational effect, which in turn triggers the formation of vortices. These vortices continuously rotate, separate, and reattach between the blades and the casing. Furthermore, the separated vortices continuously form, develop, and dissipate during the operation of the fan, thus causing complex noise problems.

[0004] To address this issue, we propose an energy-saving centrifugal fan device with adjustable blades. Summary of the Invention

[0005] Technical problems to be solved In view of this, and in view of the shortcomings of the prior art, the present invention provides an energy-saving centrifugal fan device with adjustable blades to solve the problems mentioned in the background art.

[0006] Technical solution To achieve the above objectives, the present invention provides the following technical solution: an energy-saving centrifugal fan device with adjustable blades, comprising a support frame, a drive motor fixedly installed on the top of the support frame, a fan housing one and a fan housing two provided on one side of the drive motor, the fan housing one and the fan housing two being fixedly installed together by bolts to form a housing protecting the impeller, an output shaft fixedly installed inside one side of the drive motor, the fan housing one and the fan housing two being located outside the output shaft, and also including a flow guiding component and an air inlet component; The flow guiding assembly includes an impeller front plate, an impeller rear plate, flow guide fan blades, an arc plate, a circular side plate, a volute tongue, and a positioning hub; The impeller front disc is detachably and slidably mounted on the outer surface of the output shaft; The impeller rear plate is detachably and slidably mounted on the outer surface of the output shaft, and the impeller front plate and the impeller rear plate together form a flow guide cavity; Several guide fan blades are fixedly connected in a circumferential array to the surface of the guide fan blades near the front disk of the impeller. The airflow channel is formed between two adjacent guide fan blades. The top surface of each guide fan blade is set as a spiral shape, and the side surface of each guide fan blade is set as an arc shape. Several arc-shaped plates are fixedly connected between the front and rear impeller discs in a circular array, and all the arc-shaped plates are set in an arc shape; The circular side plate is fixedly connected to the side of the impeller rear disc; The spiral tongue is fixedly connected to the upper surface of the circular side plate in a circumferential array, and the adjacent circular side plates together form a drainage channel; The positioning hub is fixedly installed at the center of the surface of the impeller rear disc near the impeller front disc.

[0007] Preferably, the guide fan blades and the arc-shaped plate are all disposed inside the guide cavity. The number of guide fan blades, arc-shaped plates, and volute tongues is the same and is always an odd number. All guide fan blades abut against the outer surface of the positioning hub. The calculation equation for the arc-shaped side of the guide fan blade is ρ=a+b θ,z=k θ; In the formula, ρ is the polar radius, θ is the polar angle between adjacent guide fan blades, a is the initial radius, b is the radius growth rate, c is the vertical distance between the contact point between the guide fan blade and the positioning hub and the origin of the plane coordinate system, and k is the axial rise rate. When generating the calculation equation, a Cartesian coordinate system is generated with the central axis of the positioning hub as the origin. The range of values ​​for a is 360-440, the range of values ​​for b is 0.85-1, the range of values ​​for k is 1.65-1.85, and the range of values ​​for θ is [θ...]. MIN θ MAX ], θ MIN and θ MAX The value of θ ranges from 45° to 75°. MIN With θ MAX The difference between them is 15°-20°.

[0008] Preferably, the shortest distance H1 between the top edge of the guide fan blade near the positioning hub and the top surface of the impeller rear disc ranges from 185.5mm to 186.5mm; the longest distance H2 between the top edge of the guide fan blade and the top surface of the impeller rear disc ranges from 372.5mm to 374.5mm; the longest distance H3 between the end of the guide fan blade away from the positioning hub and the top surface of the impeller rear disc ranges from 155.5mm to 156.5mm; and the distance between the highest point O of the spiral shape at the top of the guide fan blade and the middle point P is D. 1， The distance between the highest point O and the lowest point Q of the spiral shape at the top of the guide fan blade is D2.

[0009] Preferably, the helical shape at the tip of the guide fan blade is generated by a helical equation, the calculation formula of which is: ; ; ; In the formula, H represents the axial height of a single helix, where n is the number of turns in the helix. max Let L be the total length of the helix and D be the average diameter of the helix. Let H3 be the value of the longest distance. Let H1 be the value of the shortest distance.

[0010] Preferably, each arc-shaped plate is positioned between the guide fan blade and the volute tongue at the corresponding location, and each airflow channel is connected to the corresponding drainage channel.

[0011] Preferably, both the arc-shaped plate and the volute tongue are positioned on the extension line of the arc-shaped curve on the side of the guide fan blade.

[0012] Preferably, the vertical height of the upper surface of the volute tongue gradually decreases along the direction from the center of the impeller rear disk to the outer ring of the impeller rear disk, and the distance between the two sides of the volute tongue gradually decreases along the direction from the center of the impeller rear disk to the outer ring of the impeller rear disk.

[0013] Preferably, the air intake assembly further includes an air intake annular duct, a sealing plate, a reinforcing plate, and a deflector plate; The air inlet annular duct is inserted and fixed to the center of the second fan casing, and the two ends of the air inlet annular duct are respectively set on both sides of the second fan casing; The sealing plate is inserted and installed at the center of the second fan casing. One end of the sealing plate is fixedly connected to the air inlet annular duct, and the other end of the sealing plate extends into the interior of the second fan casing. The reinforcing plate is fixedly connected in a ring at equal intervals between the sealing plate and the outer surface of the air inlet ring duct; The diversion plate is fixedly connected in a ring at equal intervals to the surface of the sealing plate on the side away from the air inlet ring duct.

[0014] Preferably, the number of guide plates is the same as the number of guide fan blades, and each guide fan blade and guide plate is arranged sequentially along the direction from the front plate of the impeller to the rear plate of the impeller.

[0015] Preferably, the surface of the guide plate near the guide fan blade is configured with the same spiral shape, and the distance between the surface of the guide plate near the guide fan blade and the surface of the guide fan blade near the guide plate is 55.5mm to 60.5mm.

[0016] Compared with the prior art, the present invention provides an energy-saving centrifugal fan device with adjustable blades, which has the following beneficial effects: By using the volute tongue, arc plate, and guide fan blades, when the centrifugal fan is in use, the airflow enters the airflow channel formed by multiple guide fan blades through the guide channel. The airflow will flow along the arc side of the guide fan blades. Furthermore, because the top of the guide fan blades is set with a spiral curved surface, the curved surface transition eliminates the high-frequency eddy noise source generated by the right angle deflection. Combined with the gradually narrowing guide channel, a multi-stage noise reduction structure is formed to reduce the overall noise. Among them, the special geometry (spiral shape) at the top of the guide fan blades extends the work path of the airflow, and can achieve higher static pressure gain at the same speed. The airflow channel is connected to the guide channel, which guides outside air through the guide channel and into the airflow channel. This allows the airflow to enter the centrifugal fan along a predetermined trajectory, preventing the airflow from directly contacting the guide fan blades and causing significant impact on them, which would lead to excessive wear after prolonged use. The arc-shaped plate positioned between the volute tongue and the guide vane is used to divide the gas flow channel between the two. By physically dividing the airflow, the degree of airflow turbulence is effectively reduced, and surge phenomenon is avoided. Furthermore, the arc-shaped plate can further divide the airflow into multiple sub-airflows, reducing the large-scale vortices generated by the impeller rotation, thereby reducing noise.

[0017] Among them, the change in the size of the volute tongue and the tapered structure form a natural converging channel, which accelerates the airflow from the center of the impeller to the edge. At the same time, the narrowing gap can reduce the gap leakage between the volute tongue and the impeller and reduce the risk of secondary backflow. In addition, the gradual structure of the flow channel between the volute tongues avoids the turbulent pulsation caused by the sudden cross section. Combined with the tilting design of the volute tongue itself, it can further disperse the impact noise. The guide plate is adapted to the shape of the guide fan blades, so that the gap between the two forms an additional gas flow gap. The asymmetrical gap layout breaks the inherent resonant frequency band. Combined with the curved guide surface, the equipment can still maintain a low turbulence state under partial load, which is suitable for the frequency conversion control of centrifugal fans. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall appearance and structure of the present invention; Figure 2 For the present invention Figure 1 Another perspective structural diagram; Figure 3 This is an exploded view of the overall structure of the device of the present invention; Figure 4 This is a schematic diagram of the connection relationship at the front disc of the impeller in this invention; Figure 5 For the present invention Figure 4Top view diagram; Figure 6 For the present invention Figure 4 Front view diagram; Figure 7 This is a schematic diagram of the connection relationship at the annular side plate of the present invention; Figure 8 For the present invention Figure 7 Front view diagram; Figure 9 This is a schematic diagram of the data marking plane at the guide fan blade of the present invention; Figure 10 This is a schematic diagram of the top data marking plane at the guide fan blade of the present invention.

[0019] In the diagram: 11. Support frame; 12. Drive motor; 13. Fan housing 1; 14. Fan housing 2; 15. Output shaft; 21. Impeller front plate; 22. Impeller rear plate; 23. Guide vane; 24. Airflow channel; 25. Arc plate; 26. Circular side plate; 27. Volute tongue; 28. Drainage channel; 29. ​​Positioning hub; 31. Air inlet ring duct; 32. Sealing plate; 33. Reinforcing plate; 34. Drainage plate. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Embodiments of the present invention Please see Figures 1 to 9 An energy-saving centrifugal fan device with adjustable blades includes a support frame 11, a drive motor 12 fixedly installed on the top of the support frame 11, a fan housing 13 and a fan housing 14 disposed on one side of the drive motor 12, the fan housing 13 and the fan housing 14 being fixedly installed together by bolts to form a housing protecting the impeller, an output shaft 15 fixedly installed inside one side of the drive motor 12, the fan housing 13 and the fan housing 14 being disposed outside the output shaft 15, and also includes a flow guide assembly and an air inlet assembly; The flow guiding assembly includes an impeller front plate 21, an impeller rear plate 22, a flow guiding fan blade 23, an arc plate 25, an annular side plate 26, a volute tongue 27, and a positioning hub 29. The impeller front disc 21 is detachably and slidably mounted on the outer surface of the output shaft 15; The impeller rear plate 22 is detachably and slidably mounted on the outer surface of the output shaft 15, and the impeller front plate 21 and the impeller rear plate 22 together form a flow guide cavity. Several guide fan blades 23 are fixedly connected in a circumferential array to the surface of the guide fan blades 23 near the impeller front disk 21. The airflow channel 24 is formed between two adjacent guide fan blades 23. The top surface of each guide fan blade 23 is set as a spiral shape, and the side surface of each guide fan blade 23 is set as an arc shape. Several arc-shaped plates 25 are fixedly connected in a circular array between the impeller front plate 21 and the impeller rear plate 22, and all the arc-shaped plates 25 are set in an arc shape; The annular side plate 26 is fixedly connected to the side of the impeller rear plate 22; The spiral tongue 27 is fixedly connected to the upper surface of the annular side plate 26 in a circumferential array, and the adjacent annular side plates 26 together form a drainage channel 28; The positioning hub 29 is fixedly installed at the center of the surface of the impeller rear plate 22 near the impeller front plate 21.

[0022] In an alternative embodiment, see [reference] Figures 5 to 7 as well as Figure 9 The guide fan blades 23 and the arc-shaped plate 25 are all disposed inside the guide cavity. The number of guide fan blades 23, arc-shaped plates 25 and volute tongues 27 are the same and are all set to an odd number. Multiple guide fan blades 23 abut against the outer surface of the positioning hub 29. The calculation equation for the arc-shaped side of the guide fan blades 23 is ρ=a+b θ,z=k θ; In the formula, ρ is the polar radius, θ is the polar angle between adjacent guide fan blades 23, a is the initial radius, b is the radius growth rate, c is the vertical distance between the contact point of the guide fan blade 23 and the positioning hub 29 and the origin of the plane coordinate system, and k is the axial rise rate. When generating the calculation equation, a Cartesian coordinate system is generated with the central axis of the positioning hub 29 as the origin. The range of values ​​for a is 360-440, the range of values ​​for b is 0.85-1, the range of values ​​for k is 1.65-1.85, and the range of values ​​for θ is [θ...]. MIN θ MAX ], θ MIN and θ MAX The value of θ ranges from 45° to 75°. MIN With θ MAX The difference between them is 15°-20°.

[0023] Among them, the impeller front plate 21, the impeller rear plate 22, the guide vane 23, and the volute tongue 27 together form the impeller for the centrifugal fan to provide ventilation.

[0024] The arc surface of the guide fan blade 23 is curved in the opposite direction to the rotation direction of the output shaft 15.

[0025] In an alternative embodiment, see [reference] Figure 4 and Figures 6 to 9 The shortest distance H1 between the top edge of the guide fan blade 23 near the positioning hub 29 and the top surface of the impeller rear plate 22 ranges from 185.5mm to 186.5mm. The longest distance H2 between the top edge of the guide fan blade 23 and the top surface of the impeller rear plate 22 ranges from 372.5mm to 374.5mm. The longest distance H3 between the end of the guide fan blade 23 away from the positioning hub 29 and the top surface of the impeller rear plate 22 ranges from 155.5mm to 156.5mm. The distance between the highest point O and the middle point P of the spiral shape at the top of the guide fan blade 23 is D. 1， The distance between the highest point O and the lowest point Q of the spiral shape at the top of the guide fan blade 23 is D2.

[0026] The airflow enters the airflow channel 24 formed by multiple guide fan blades 23 through the guide channel 28. The airflow flows along the arc side of the guide fan blades 23. Since the top of the guide fan blades 23 is set with a spiral curved surface, the curved surface transition eliminates the high-frequency eddy noise source generated by the right angle deflection. Together with the gradually narrowing guide channel 28, a multi-level noise reduction structure is formed to reduce the overall noise.

[0027] Meanwhile, the special geometry at the top of the guide fan blade 23 extends the work path of the airflow, enabling higher static pressure gain at the same rotational speed.

[0028] In an alternative embodiment, see [reference] Figure 4 and Figures 6 to 9 The spiral shape at the top of the guide fan blade 23 is generated by the spiral equation, which is calculated as follows: ; ; ; In the formula, H represents the axial height of a single helix, where n is the number of turns in the helix. max Let L be the total length of the helix and D be the average diameter of the helix. Let H3 be the value of the longest distance. Let H1 be the value of the shortest distance.

[0029] The spiral curved surface at the top of the guide fan blade 23 is used to guide the flow of air on the surface of the guide fan blade 23.

[0030] In an alternative embodiment, see [reference] Figure 4 and Figure 7 Each arc plate 25 is positioned between the guide fan blade 23 and the volute tongue 27 at the corresponding position, and each airflow channel 24 is connected to the guide channel 28 at the corresponding position.

[0031] The airflow channel 24 is connected to the guide channel 28, which guides the outside air through the guide channel 28 and into the airflow channel 24. This allows the airflow to enter the centrifugal fan along a predetermined trajectory, preventing the airflow from directly contacting the guide fan blades 23 and causing them to have a large impact, which would lead to significant wear after prolonged use.

[0032] In an alternative embodiment, see [reference] Figures 6 to 9 The arc plate 25 and the volute tongue 27 are both located on the extension line of the arc-shaped curve on the side of the guide fan blade 23.

[0033] The arc plate 25 and the volute tongue 27 are both arranged along the arc trajectory of the side of the guide fan blade 23, so that the guide fan blade 23, the arc plate 25 and the volute tongue 27 together form a gas movement channel for airflow, and the arc plate 25 divides the gas movement channel.

[0034] The volute tongue 27 is used to guide the external airflow and allow it to flow along the side of the volute tongue 27 into the airflow channel 24 between the guide vanes 23. The arc plate 25, which is set between the volute tongue 27 and the guide vanes 23, is used to divide the gas flow channel between the two. By physically dividing the airflow, the degree of airflow turbulence is effectively reduced, and surge phenomenon is avoided. Furthermore, the arc plate 25 can further divide the airflow into multiple sub-airflows, reducing the large-scale vortices generated by the impeller rotation, thereby reducing noise.

[0035] In an alternative embodiment, see [reference] Figures 5 to 7 as well as Figure 9 The vertical height of the upper surface of the volute tongue 27 gradually decreases along the direction from the center of the impeller rear plate 22 to the outer ring of the impeller rear plate 22, and the distance between the two sides of the volute tongue 27 gradually decreases along the direction from the center of the impeller rear plate 22 to the outer ring of the impeller rear plate 22.

[0036] Among them, the change in the size of the volute tongue 27 and the tapered structure form a natural converging channel, which accelerates the airflow from the center of the impeller to the edge. At the same time, the narrowing gap can reduce the gap leakage between the volute tongue 27 and the impeller and reduce the risk of secondary backflow. In addition, the gradual structure of the flow channel 28 between the volute tongues 27 avoids turbulent pulsation caused by abrupt cross-section. Combined with the tilting design of the volute tongue 27 itself, it can further disperse impact noise.

[0037] The end of the volute tongue 27 away from the arc plate 25 is set as a smooth curved surface to reduce the resistance encountered by the gas when passing through the volute tongue 27.

[0038] In an alternative embodiment, see [reference] Figures 6 to 7 The air intake assembly also includes an air intake annular duct 31, a sealing plate 32, a reinforcing plate 33, and a diversion plate 34; The air inlet annular duct 31 is inserted and fixed to the center of the fan housing 2 14, and the two ends of the air inlet annular duct 31 are respectively located on both sides of the fan housing 2 14. The sealing plate 32 is inserted and installed at the center of the second ventilation fan housing 14. One end of the sealing plate 32 is fixedly connected to the air inlet annular pipe 31, and the other end of the sealing plate 32 extends into the second ventilation fan housing 14. The reinforcing plate 33 is fixedly connected in a ring at equal intervals between the sealing plate 32 and the outer surface of the air inlet annular duct 31; The diversion plate 34 is fixedly connected in a ring at equal intervals to the surface of the sealing plate 32 on the side away from the air inlet ring pipe 31.

[0039] In an alternative embodiment, see [reference] Figures 6 to 7 The number of guide vanes 34 is the same as the number of guide fan blades 23, and each guide fan blade 23 and guide vane 34 are arranged sequentially along the impeller front plate 21 toward the impeller rear plate 22.

[0040] The guide plate 34 is used to adapt to the rotation of the guide fan blade 23 and guide the gas flow.

[0041] In an alternative embodiment, see [reference] Figure 6 The surface of the guide plate 34 near the guide fan blade 23 is configured with the same spiral shape, and the distance between the surface of the guide plate 34 near the guide fan blade 23 and the surface of the guide fan blade 23 near the guide plate 34 is 55.5mm to 60.5mm.

[0042] Among them, the shape of the guide plate 34 is adapted to the shape of the guide fan blade 23, so that the gap between the two forms an additional gas flow gap. The asymmetrical gap layout breaks the inherent resonant frequency band, and the curved guide surface allows the equipment to maintain a low turbulence state under partial load, which is suitable for the frequency conversion control of centrifugal fans.

[0043] This is because the asymmetric gap changes the geometric distribution characteristics of the fluid channel, causing the airflow pulsation frequency to exhibit a multi-peak distribution. This breaks the risk of single-frequency resonance under traditional symmetrical structures, disperses energy over a wider frequency range, and, in conjunction with the curved guide flow to control the vortex scale, can effectively suppress the acoustic-vibration coupling effect at specific frequencies.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An energy-saving centrifugal fan device with adjustable blades, comprising a support frame (11), a driving motor (12) fixedly installed on the top of the support frame (11), a fan shell one (13) and a fan shell two (14) provided on one side of the driving motor (12), the fan shell one (13) and the fan shell two (14) being fixedly installed by bolts and jointly forming a shell for protecting an impeller, an output rotating shaft (15) fixedly installed inside one side of the driving motor (12), and the fan shell one (13) and the fan shell two (14) being arranged outside the output rotating shaft (15), characterized in that: The air guide assembly and the air inlet assembly are further included; The air guide assembly includes a front impeller disc (21), a rear impeller disc (22), air guide vanes (23), arc-shaped plates (25), circular ring side plates (26), volute tongues (27), and a positioning wheel hub (29); The front impeller disc (21) is detachably and slidably installed on the outer surface of the output shaft (15); The rear impeller disc (22) is detachably and slidably installed on the outer surface of the output shaft (15), and the front impeller disc (21) and the rear impeller disc (22) jointly form an air guide channel; A plurality of air guide vanes (23) are fixedly connected in a circumferential array on the surface of the air guide vanes (23) close to the front impeller disc (21), and adjacent two air guide vanes (23) jointly form an air flow channel (24), the top surface of each air guide vane (23) is provided in a spiral line shape, and the side surface of each air guide vane (23) is provided in a circular arc shape; A plurality of arc-shaped plates (25) are fixedly connected in a circumferential array between the front impeller disc (21) and the rear impeller disc (22), and the arc-shaped plates (25) are provided in a circular arc shape; The circular ring side plate (26) is fixedly connected to the side edge of the rear impeller disc (22); The volute tongue (27) is fixedly connected in a circumferential array on the upper surface of the circular ring side plate (26), and adjacent circular ring side plates (26) jointly form a drainage channel (28); The positioning wheel hub (29) is fixedly installed at the center of the surface of the rear impeller disc (22) close to the front impeller disc (21).

2. The energy-saving type centrifugal fan device with an adjustable blade according to claim 1, characterized in that: The guide vane (23) and the arc-shaped plate (25) are arranged in the guide cavity, the guide vane (23), the arc-shaped plate (25) and the volute tongue (27) are the same in number and are arranged as single number, the plurality of guide vanes (23) are in contact with the outer surface of the positioning hub (29), the calculation equation of the circular arc side of the guide vane (23) is, ρ=a+b θ,z=k θ; In the formula, ρ is the polar radius, θ is the polar angle between adjacent air guide vanes (23), a is the initial radius, b is the radius growth rate, c is the vertical distance between the contact point of the air guide vane (23) and the positioning wheel hub (29) and the origin of the plane coordinates, and k is the axial rise rate; When generating the calculation equation, the central axis of the positioning wheel hub (29) is taken as the origin of the coordinate system to generate a plane rectangular coordinate system; a is in the range of 360-440, b is in the range of 0.85-1, k is in the range of 1.65-1.85, θ is in the range of [θ MIN , θ MAX ], θ MIN , and θ MAX is in the range of 45°-75°, and the difference between θ MIN and θ MAX is in the range of 15°-20°.

3. The energy-saving type centrifugal fan device with an adjustable blade according to claim 2, characterized in that: The shortest distance H1 between the top edge of the guide vane (23) close to the side of the positioning hub (29) and the top surface of the rear disc (22) is in the range of 185.5mm-186.5mm, the longest distance H2 between the top edge of the guide vane (23) and the top surface of the rear disc (22) is in the range of 372.5mm-374.5mm, the longest distance H3 between the top edge of the guide vane (23) away from the side of the positioning hub (29) and the top surface of the rear disc (22) is in the range of 155.5mm-156.5mm, and the distance D between the highest point O and the middle point P of the spiral line type of the top of the guide vane (23) is D 1， The distance D2 between the highest point O and the lowest point Q of the spiral line type of the top of the guide vane (23) is D2.

4. The energy-saving type centrifugal fan device with an adjustable blade according to claim 3, characterized in that: The spiral line type of the top of the air guide vane (23) is generated by a spiral equation, and the calculation formula of the spiral equation is: ; ; ; In the formula, is the axial height of a single helical line, n is the number of turns of the helical line, H max is the total length of the helical line, D is the average diameter of the helical line, is the value of the longest distance H3, is the value of the shortest distance H1.

5. The energy-efficient, centrifugal, vane-adjustable fan device of claim 1, wherein: Each arc-shaped plate (25) is arranged between the corresponding air guide vane (23) and volute tongue (27), and each air flow channel (24) is in communication with the corresponding drainage channel (28).

6. The energy-efficient, centrifugal, vane-adjustable fan device of claim 1, wherein: The arc-shaped plate (25) and the volute tongue (27) are arranged on the extension line of the circular arc curve of the side surface of the air guide vane (23).

7. The energy-efficient, centrifugal, vane-adjustable fan device of claim 1, wherein: The upper surface of the volute tongue (27) is lowered vertically between the height of the center of the rear impeller disc (22) to the outer ring of the rear impeller disc (22), and the distance between the two sides of the volute tongue (27) gradually decreases along the center of the rear impeller disc (22) to the outer ring of the rear impeller disc (22).

8. The energy-efficient, centrifugal, vane-adjustable fan device of claim 1, wherein: The air inlet assembly further includes an air inlet annular pipeline (31), a sealing plate (32), a reinforcing plate (33), and a drainage plate (34); The air inlet annular pipeline (31) is inserted and fixed in the center of the ventilator housing two (14), and the two ends of the air inlet annular pipeline (31) are arranged on the two sides of the ventilator housing two (14), respectively. The sealing plate (32) is inserted and installed at the center of the ventilator shell two (14), one end of the sealing plate (32) is fixedly connected with the air inlet annular pipeline (31), and the other end of the sealing plate (32) extends to the inside of the ventilator shell two (14); The reinforcing plate (33) is annularly and equidistantly fixedly connected between the outer surfaces of the sealing plate (32) and the air inlet annular pipeline (31); The drainage plate (34) is annularly and equidistantly fixedly connected to the surface of the sealing plate (32) away from the air inlet annular pipeline (31).

9. A vane-adjustable energy-saving centrifugal fan device according to claim 8, characterized in that: The number of the drainage plates (34) is the same as that of the guide vanes (23), and each guide vane (23) and the drainage plate (34) are sequentially arranged along the direction from the impeller front disc (21) to the impeller rear disc (22).

10. The energy-efficient, centrifugal, vane-adjustable fan device of claim 8, wherein: The surface of the drainage plate (34) close to the guide vane (23) is provided with the same helical line as that of the guide vane (23), and the distance between the surface of the drainage plate (34) close to the guide vane (23) and the surface of the guide vane (23) close to the drainage plate (34) is 55.5mm-60.5mm.

Images