Centrifugal fan with adjustable volute tongue

Abstract

The centrifugal fan comprises a volute main body, a flexible volute tongue and a volute tongue driving mechanism, a concave part, close to an air outlet, of the volute main body is provided with a groove opening, and the groove opening is fixedly connected with the flexible volute tongue; the volute tongue driving mechanism is connected to the volute body and used for exerting pressure on the flexible volute tongue so that the flexible volute tongue can change the structure (namely, change the shape and / or change the inclination angle). The centrifugal fan is simple in structure, the volute tongue driving mechanism can apply pressure to the flexible volute tongue so that the structure of the flexible volute tongue can be changed, finally, the shape and / or the inclination angle of the flexible volute tongue are / is changed, different adjustments can be conducted according to different working conditions, and therefore it is guaranteed that under the different working conditions, noise of the centrifugal fan can be reduced, and the service life of the centrifugal fan is prolonged. And the flow and the efficiency of the centrifugal fan are improved.

Description

Technical Field

[0001] The invention belongs to the field of centrifugal fans and is a centrifugal fan with adjustable volute tongues, specifically, the shape and / or inclination angle of the volute tongues can be adjusted. Background Art

[0002] Centrifugal fans are widely used in various household appliances and manufacturing industries such as air conditioners, range hoods, and ventilation systems due to their compact structure, high pressure coefficient, and large flow coefficient. The volute tongue structure of the centrifugal fans currently in common use is fixed during production, and the structure of the volute tongue cannot be changed. The volute tongue structure has a great influence on the flow, efficiency, and noise of the centrifugal fan. Under low flow conditions, part of the air flow will return to the inside of the fan at the volute tongue, thereby reducing the flow and efficiency; under high flow conditions, the air flow will periodically impact the volute tongue structure and generate a lot of noise. In order to solve the problem that the volute tongue structure of the currently commonly used centrifugal fans is a fixed structure, resulting in the flow and efficiency being able to reach the maximum only under specific conditions, and low efficiency and energy waste under other conditions, a centrifugal fan with an adjustable volute tongue is designed. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a centrifugal fan with an adjustable volute tongue in view of the deficiencies in the above-mentioned prior art. The centrifugal fan with an adjustable volute tongue has a simple structure. The volute tongue driving mechanism can apply pressure to the flexible volute tongue to cause the structure of the flexible volute tongue to change, and finally change the shape and / or inclination angle of the flexible volute tongue. Different adjustments can be made for different working conditions, thereby ensuring that under different working conditions, the noise of the centrifugal fan can be reduced and the flow rate and efficiency of the centrifugal fan can be improved.

[0004] In order to achieve the above technical objectives, the technical solution adopted by the present invention is:

[0005] A centrifugal fan with adjustable volute tongue, comprising a volute body, a flexible volute tongue and a volute tongue driving mechanism, wherein a groove opening is provided at a concave portion of the volute body close to an air outlet, and the flexible volute tongue is fixedly connected to the groove opening;

[0006] The volute tongue driving mechanism is connected to the volute body, and is used to apply pressure to the flexible volute tongue so as to cause the flexible volute tongue to undergo structural changes (ie, shape changes and / or inclination angle changes).

[0007] As a further improved technical solution of the present invention, the volute body is composed of a rear cover plate, a front cover plate and an annular wall, the front side of the annular wall is fixedly connected to the front cover plate, the rear side of the annular wall is fixedly connected to the rear cover plate, a notch is provided in the recessed portion of the annular wall, and a notch one is provided in the recessed portions of the front cover plate and the rear cover plate, and the notch and notch one are interconnected to form a recessed groove opening.

[0008] As a further improved technical solution of the present invention, the outer surface of the recessed portion of the rear cover plate is fixedly connected to a rear protrusion plate, and the outer surface of the recessed portion of the front cover plate is fixedly connected to a front protrusion plate, the rear protrusion plate and the front protrusion plate are symmetrically arranged and both have grooves 2 on their inner surfaces, groove 1 of the front cover plate and groove 2 of the front protrusion plate are aligned and connected; groove 1 of the rear cover plate and groove 2 of the rear protrusion plate are aligned and connected.

[0009] As a further improved technical solution of the present invention, the flexible volute tongue includes a flexible arc-shaped wall and a flexible extended end portion, and both ends of the flexible arc-shaped wall are fixedly connected with the flexible extended end portions; the flexible volute tongue is located between the rear protrusion plate and the front protrusion plate; the upper side wall of the flexible arc-shaped wall is connected to the upper surrounding wall of the notch, the lower side wall of the flexible arc-shaped wall is connected to the lower surrounding wall of the notch, the flexible extended end portion is connected to the inner wall of the notch one and the inner wall of part of the notch two, and the outer end surface of the flexible extension end portion is not connected to the inner end surface of the notch two and a gap is provided therebetween.

[0010] As a further improved technical solution of the present invention, the arc-shaped outer wall of the flexible arc-shaped wall is flush with the arc-shaped extended outer wall of the flexible extended end portion.

[0011] As a further improved technical solution of the present invention, the worm tongue driving mechanism includes a fixed plate, a first worm gear reducer, a second worm gear reducer, a first threaded rod, a second threaded rod, a first rotating pair, a second rotating pair and a compression rod; the fixed plate is connected to the volute body by bolts and faces the flexible worm tongue, and the first worm gear reducer and the second worm gear reducer are both connected to the fixed plate;

[0012] The output end of the first worm gear reducer is connected to the first threaded rod, the first threaded rod is threadedly connected to a threaded hole at one end of the first rotating pair, the first rotating pair is rotatably connected to the first connecting ear, and the first connecting ear is fixedly connected to one end of the compression rod;

[0013] The output end of the second worm gear reducer is connected to the second threaded rod, the second threaded rod is threadedly connected to a threaded hole at one end of the second rotating pair, the second rotating pair is rotatably connected to the second connecting ear, and the second connecting ear is slidably connected to the other end of the compression rod;

[0014] The length of the compression rod is less than or equal to the length of the flexible volute tongue, and the compression rod is used to apply pressure to the flexible volute tongue.

[0015] As a further improved technical solution of the present invention, a plurality of through holes are formed on the fixing plate, and the first threaded rod and the second threaded rod are rotatably connected to the through holes via bearings.

[0016] As a further improved technical solution of the present invention, the first rotating pair is rotationally connected to the first connecting ear through a central shaft, and the second rotating pair is rotationally connected to the second connecting ear through a central shaft.

[0017] As a further improved technical solution of the present invention, the surface of the compression rod that contacts the arc-shaped outer wall and the arc-shaped extended outer wall of the flexible volute tongue is an arc surface.

[0018] The beneficial effects of the present invention are:

[0019] The present invention has a simple structure and an ingenious design. The overall structural stability of the flexible volute tongue and the volute tongue driving mechanism is good. The flexible volute tongue can be fine-tuned, has good operability, is not easy to be damaged, meets market demand, and is suitable for promotion. When the present invention is in operation, if the motor drives the first worm gear reducer to rotate, the first worm gear reducer drives the first threaded rod to rotate, and at the same time pushes the compression rod to press down the flexible volute tongue on one side, and one side of the flexible volute tongue is deformed. At this time, the inclination angle between the two sides of the flexible volute tongue can be changed (relevant literature shows that the inclination angle of the volute tongue can reduce the noise of the centrifugal fan, improve the flow rate and efficiency when it is appropriate). If two motors drive the first worm gear reducer and the second worm gear reducer to rotate at the same time, the first worm gear reducer and the second worm gear reducer respectively drive the first threaded rod and the second threaded rod to rotate and push the two ends of the compression rod to press down at the same time, and at this time, the shape of the flexible volute tongue can be changed, and the flexible arc wall of the flexible volute tongue deforms and extends toward the inside of the volute body. When the first worm gear reducer and the second worm gear reducer are used in combination, the shape and inclination of the flexible volute tongue can be changed at the same time, and different adjustments can be made for different working conditions. Specifically for different working conditions, in order to reduce the noise of the centrifugal fan and improve the flow rate and efficiency, how to change the shape and inclination of the flexible volute tongue can be obtained through multiple tests. Ultimately, it is ensured that changing the shape of the flexible volute tongue through the entire mechanism can ensure that the centrifugal fan can achieve the maximum flow rate and efficiency under various working conditions, and by changing the inclination of the flexible volute tongue, the noise of the centrifugal fan can be reduced and its flow rate and efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 3 It is a schematic diagram of the main structure of the volute of the present invention.

[0023] Figure 4 It is a schematic diagram of the main structure of the volute of the present invention.

[0024] Figure 5 It is a schematic diagram of the flexible snail tongue structure of the present invention.

[0025] Figure 6 It is a schematic diagram of the flexible snail tongue structure of the present invention.

[0026] Figure 7 It is a schematic diagram of the structure after the volute body and the flexible volute tongue structure are connected in the present invention.

[0027] Figure 8 It is a schematic diagram of the structure after the volute body and the flexible volute tongue structure are connected in the present invention.

[0028] Fig. 9 It is a schematic structural diagram of the volute tongue driving mechanism and the flexible volute tongue of the present invention.

[0029] Fig.10 It is a structural schematic diagram of the volute tongue driving mechanism of the present invention.

[0030] Fig.11 It is a schematic diagram of the main structure of the volute of the present invention.

[0031] Fig.12 for Fig.11 AA cross-section diagram.

[0032] Fig.13 This is a partial enlarged view of Figure C.

[0033] Fig.14 for Fig.11 BB cross-section diagram. DETAILED DESCRIPTION

[0034] The specific embodiments of the present invention are further described below according to the accompanying drawings:

[0035] like Figure 1-2 As shown, a centrifugal fan with adjustable volute tongue includes a volute body 1, a flexible volute tongue 2 and a volute tongue driving mechanism 3. The volute body 1 is provided with a groove opening in a recessed portion near the air outlet 101, and the flexible volute tongue 2 is fixedly connected to the groove opening.

[0036] The volute tongue driving mechanism 3 is connected to the volute body 1 , and is used to apply pressure to the flexible volute tongue 2 so as to cause the flexible volute tongue 2 to undergo structural changes (ie, shape changes and / or inclination angle changes).

[0037] Further, such as Figure 3-4 As shown, the volute body 1 is composed of a rear cover plate 104, a front cover plate 102 and an annular wall 103. The front side of the annular wall 103 is fixedly connected to the front cover plate 102, and the rear side of the annular wall 103 is fixedly connected to the rear cover plate 104. The front cover plate 102 is provided with an air inlet. The rear cover plate 104, the front cover plate 102 and one end of the annular wall 103 form an air outlet 101. A notch 1031 is provided in the arc-shaped recessed portion of the annular wall 103, and a notch 1021 is provided in the recessed portions of the front cover plate 102 and the rear cover plate 104. The notch 1031 is connected to the notch 1021 to form a groove opening.

[0038] Furthermore, the outer side surface of the notch 1021 of the rear cover plate 104 is fixedly connected to the rear protruding plate 106, and the outer side surface of the notch 1021 of the front cover plate 102 is fixedly connected to the front protruding plate 105, the rear protruding plate 106 and the front protruding plate 105 are symmetrically arranged and the inner surfaces of both are provided with a notch 2 1051, the notch 1021 of the front cover plate 102 and the notch 2 1051 of the front protruding plate 105 are aligned and connected; the notch 1021 of the rear cover plate 104 and the notch 2 1051 of the rear protruding plate 106 are aligned and connected, and the three inner walls of the notch 1021 of the rear cover plate 104 and the three inner walls of the notch 2 1051 of the rear protruding plate 106 are aligned and connected.

[0039] Further, such as Figure 5-6 As shown, the flexible volute tongue 2 includes a flexible arc-shaped wall 201 and a flexible extension end 202, and both ends of the flexible arc-shaped wall 201 are fixedly connected to the flexible extension end 202; the flexible volute tongue 2 is located between the rear protrusion plate 106 and the front protrusion plate 105; Figure 7-8 As shown, the upper side wall 2011 of the flexible arc-shaped wall 201 is connected to the upper surrounding wall 10311 of the notch 1031, the lower side wall 2012 of the flexible arc-shaped wall 201 is connected to the lower surrounding wall 10312 of the notch 1031, and the flexible extension end 202 is connected to the three inner walls aligned with the notch 1021 and the notch 2 1051. The outer end surface 2021 of the flexible extension end 202 is connected to the inner end surface 10511 of the notch 2 1051 ( Figure 4 ) are not connected and a small gap is reserved to facilitate the compression and deformation of the flexible extension end 202. The arc-shaped outer wall 2013 of the flexible arc-shaped wall 201 is flush with the arc-shaped extension outer wall 2022 of the flexible extension end 202, and the flexible volute tongue 2 can be made of rubber or other compressible and recoverable materials.

[0040] Further, such as Figure 9-10 As shown, the worm tongue driving mechanism 3 includes a fixed plate 301, a first worm gear reducer 302, a second worm gear reducer 303, a first threaded rod 304, a second threaded rod 305, a first rotation pair 306, a second rotation pair 307 and a compression rod 310; the fixed plate 301 is connected to the volute body 1 by bolts and faces the flexible worm tongue 2, the first worm gear reducer 302 and the second worm gear reducer 303 are both symmetrically connected to the fixed plate 301 by bolts; the first worm gear reducer 302 and the second worm gear reducer 303 are both connected to the motor 311. The worm gear transmission has the advantage of self-locking.

[0041] The output end of the first worm gear reducer 302 is connected to the first threaded rod 304, the first threaded rod 304 is threadedly connected to a threaded hole at one end of the first rotating pair 306, the first rotating pair 306 is rotatably connected to the first connecting ear 308, and the first connecting ear 308 is fixedly connected to one end of the compression rod 310.

[0042] The output end of the second worm gear reducer 303 is connected to the second threaded rod 305, the second threaded rod 305 is threadedly connected to a threaded hole at one end of the second rotation pair 307, the second rotation pair 307 is rotationally connected to the second connecting ear 309, and the second connecting ear 309 is slidably connected to the other end of the compression rod 310. The bottom of the second connecting ear 309 is a slider, and the other end of the compression rod 310 is provided with a slide groove, and the slider can slide in the slide groove to achieve the sliding connection between the second connecting ear 309 and the compression rod 310.

[0043] The advantage of adopting the threaded rod transmission in this embodiment is that the flexible volute tongue can be fine-tuned, and the controllability is good.

[0044] The length of the compression rod 310 is less than or equal to the length of the flexible volute tongue 2 , and the compression rod 310 is used to apply pressure to the flexible volute tongue 2 .

[0045] Further, such as Figure 11-13 As shown, the fixing plate 301 is provided with a plurality of through holes, and bearings 312 and retaining rings 313 are provided in the through holes. The bearings 312 are fixed in the through holes on the fixing plate 301 by the retaining rings 313, and the first threaded rod 304 and the second threaded rod 305 are rotatably connected to the through holes through the bearings 312. The retaining rings 313 play a role in fixing the bearings 312. The first threaded rod 304 and the second threaded rod 305 pass through the bearings 312 and the retaining rings 313 respectively, thereby ensuring the stability and reliability of the rotational motion.

[0046] Further, such as Figure 11-13 As shown, the first rotation pair 306 is rotationally connected to the first connection ear 308 through the spindle 314, and the second rotation pair 307 is rotationally connected to the second connection ear 309 through the spindle 314. The bolt passes through the spindle 314 and is connected to the nut. The existence of the spindle 314 ensures the stability of rotation when pressing down on one side, and also ensures that the bolt and other structures will not be damaged when pressing down.

[0047] Furthermore, a surface of the compression rod 310 that contacts the arc-shaped outer wall 2013 and the arc-shaped extended outer wall 2022 of the flexible volute tongue 2 is an arc surface.

[0048] When the motor 311 is powered on, the motor 311 drives the first worm gear reducer 302 to rotate, the first worm gear reducer 302 drives the first threaded rod 304 to rotate, the first rotation pair 306 moves axially along the first threaded rod 304, and the first rotation pair 306 is driven to rotate the compression rod 310 through the first connecting ear 308. Another motor 311 drives the second worm gear reducer 303 to rotate, the second worm gear reducer 303 drives the second threaded rod 305 to rotate, the second rotation pair 307 moves axially along the second threaded rod 305, and the second rotation pair 307 is driven to rotate the compression rod 310 through the second connecting ear 309. The compression rod 310 can apply pressure to the flexible volute tongue 2, thereby causing the flexible volute tongue 2 to send deformation.

[0049] Furthermore, when the first threaded rod 304 rotates, the first rotating pair 306 is pushed to move axially along the first threaded rod 304, and at the same time, the compression rod 310 is pushed down to deform the flexible volute tongue 2 of the fan; when the second threaded rod 305 rotates, the second rotating pair 307 is pushed to move axially along the second threaded rod 305, and at the same time, the compression rod 310 is pushed down to deform the flexible volute tongue 2 of the fan. When the compression rod 310 presses down the flexible volute tongue 2 on one side, the inclination angle of the flexible volute tongue 2 will change, and when the compression rod 310 presses down the flexible volute tongue 2 on both sides, the overall shape of the flexible volute tongue 2 will change, that is, Fig.14 As shown by the arrow, the flexible volute tongue 2 is compressed and stretched and extends toward the inside of the volute body 1, changing the stretching amount of the flexible arc-shaped wall 201 of the volute tongue. When used in combination, the shape and inclination angle of the flexible volute tongue 2 can be changed at the same time. The first worm gear reducer 302 and the second worm gear reducer 303 are both driven by the motor 311 to adjust the flexible volute tongue 2. It is more labor-saving to adjust by the motor 311, and the adjustment amount of the flexible volute tongue 2 can be determined according to the rotation of the motor 311, and the controllability is good. The worm gear transmission itself has self-locking properties, which can ensure that the centrifugal fan will not affect the flexible volute tongue 2 during operation, thereby increasing the stability of the overall regulation. The first threaded rod 304 is threadedly connected to the threaded hole at one end of the first rotating pair 306 to ensure that the first threaded rod 304 can push the first rotating pair 306 to move axially when it rotates, and the second threaded rod 305 is threadedly connected to the threaded hole at one end of the second rotating pair 307 to ensure that the second threaded rod 305 can push the second rotating pair 307 to move axially when it rotates.

[0050] In addition, the shape of the flexible volute tongue 2 is changed by the entire mechanism (i.e. Fig.14 As shown by the arrow, increasing the stretching amount of the flexible arc wall 201 can ensure that the centrifugal fan can achieve the maximum flow rate and efficiency under various working conditions. By changing the inclination angle of the flexible volute tongue 2, the noise of the centrifugal fan can be reduced and its flow rate and efficiency can be improved.

[0051] The protection scope of the present invention includes but is not limited to the above embodiments. The protection scope of the present invention shall be based on the claims. Any replacement, deformation, and improvement of the technology that can be easily thought of by technicians in this field shall fall within the protection scope of the present invention.

Claims

1. A centrifugal fan with adjustable volute tongue, characterized in that: It comprises a volute body (1), a flexible volute tongue (2) and a volute tongue driving mechanism (3); a groove opening is provided at a recessed portion of the volute body (1) close to an air outlet (101), and the flexible volute tongue (2) is connected to the groove opening; The volute tongue driving mechanism (3) is connected to the volute body (1), and the volute tongue driving mechanism (3) is used to apply pressure to the flexible volute tongue (2) so as to cause the flexible volute tongue (2) to undergo structural changes.

2. The centrifugal fan with adjustable volute tongue according to claim 1, characterized in that: The volute body (1) is composed of a rear cover plate (104), a front cover plate (102) and an annular wall (103); the front side of the annular wall (103) is fixedly connected to the front cover plate (102); the rear side of the annular wall (103) is fixedly connected to the rear cover plate (104); a notch (1031) is provided in a recessed portion of the annular wall (103); and recessed portions of the front cover plate (102) and the rear cover plate (104) are both provided with a notch 1 (1021); the notch (1031) and the notch 1 (1021) are interconnected to form a recessed groove opening.

3. The centrifugal fan with adjustable volute tongue according to claim 2, characterized in that: The outer surface of the recessed portion of the rear cover plate (104) is fixedly connected to a rear protruding plate (106), and the outer surface of the recessed portion of the front cover plate (102) is fixedly connected to a front protruding plate (105). The rear protruding plate (106) and the front protruding plate (105) are symmetrically arranged and both inner surfaces are provided with a second notch (1051). The first notch (1021) of the front cover plate (102) and the second notch (1051) of the front protruding plate (105) are aligned and connected; the first notch (1021) of the rear cover plate (104) and the second notch (1051) of the rear protruding plate (106) are aligned and connected.

4. The centrifugal fan with adjustable volute tongue according to claim 3, characterized in that: The flexible volute tongue (2) comprises a flexible arc-shaped wall (201) and a flexible extension end portion (202), and both ends of the flexible arc-shaped wall (201) are fixedly connected with the flexible extension end portions (202); the flexible volute tongue (2) is located between the rear protruding plate (106) and the front protruding plate (105); the upper side wall (2011) of the flexible arc-shaped wall (201) is connected to the upper surrounding wall (10311) of the notch (1031), the lower side wall (2012) of the flexible arc-shaped wall (201) is connected to the lower surrounding wall (10312) of the notch (1031), the flexible extension end portion (202) is connected to the inner wall of the first notch (1021) and part of the inner wall of the second notch (1051), and the outer end surface (2021) of the flexible extension end portion (202) is not connected to the inner end surface (10511) of the second notch (1051), and a gap is provided.

5. The centrifugal fan with adjustable volute tongue according to claim 4, characterized in that: The arc-shaped outer wall (2013) of the flexible arc-shaped wall (201) is flush with the arc-shaped extended outer wall (2022) of the flexible extended end portion (202).

6. The centrifugal fan with adjustable volute tongue according to claim 1, characterized in that: The worm tongue driving mechanism (3) comprises a fixed plate (301), a first worm gear reducer (302), a second worm gear reducer (303), a first threaded rod (304), a second threaded rod (305), a first rotation pair (306), a second rotation pair (307) and a compression rod (310); the fixed plate (301) is connected to the volute body (1) by bolts and faces the flexible worm tongue (2); the first worm gear reducer (302) and the second worm gear reducer (303) are both connected to the fixed plate (301); The output end of the first worm gear reducer (302) is connected to the first threaded rod (304), the first threaded rod (304) is threadedly connected to a threaded hole at one end of the first rotating pair (306), the first rotating pair (306) is rotatably connected to the first connecting ear (308), and the first connecting ear (308) is fixedly connected to one end of the compression rod (310); The output end of the second worm gear reducer (303) is connected to the second threaded rod (305), the second threaded rod (305) is threadedly connected to a threaded hole at one end of the second rotating pair (307), the second rotating pair (307) is rotationally connected to the second connecting ear (309), and the second connecting ear (309) is slidably connected to the other end of the compression rod (310); The length of the compression rod (310) is less than or equal to the length of the flexible volute tongue (2), and the compression rod (310) is used to apply pressure to the flexible volute tongue (2).

7. The centrifugal fan with adjustable volute tongue according to claim 6, characterized in that: The fixing plate (301) is provided with a plurality of through holes, and the first threaded rod (304) and the second threaded rod (305) are rotatably connected to the through holes via bearings (312).

8. The centrifugal fan with adjustable volute tongue according to claim 6, characterized in that: The first rotating pair (306) is rotationally connected to the first connecting ear (308) via the spindle (314), and the second rotating pair (307) is rotationally connected to the second connecting ear (309) via the spindle (314).

9. The centrifugal fan with adjustable volute tongue according to claim 6, characterized in that: The surface of the compression rod (310) that contacts the arc-shaped outer wall (2013) and the arc-shaped extended outer wall (2022) of the flexible volute tongue (2) is an arc surface.

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