CN215409425U - Duplex centrifugal air duct volute tongue structure - Google Patents
Duplex centrifugal air duct volute tongue structure Download PDFInfo
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- CN215409425U CN215409425U CN202121025245.1U CN202121025245U CN215409425U CN 215409425 U CN215409425 U CN 215409425U CN 202121025245 U CN202121025245 U CN 202121025245U CN 215409425 U CN215409425 U CN 215409425U
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Abstract
The utility model relates to a duplex centrifugal air duct volute tongue structure, which comprises a volute and an air duct arranged in the volute, wherein an impeller is arranged in the air duct, air inlets are arranged at the left side and the right side of the air duct, air outlets are arranged at the end parts of the air duct, and volute tongues are arranged on the air outlets; a gap is formed between the impeller and the volute, and the gap between the impeller and the volute is gradually increased along the flowing direction of air in the air duct; the minimum clearance T between the impeller and the volute is positioned in front of the volute tongue; the air outlet is located behind the minimum gap T. The minimum gap between the impeller and the volute is arranged in front of the volute tongue, namely the minimum gap T is moved backwards into the air channel, so that the problem of turbulence generated when air flows in the air channel is solved, the air output and the efficiency of the fan are improved, the impact between the impeller and the volute tongue can be reduced while the air quantity is met, the whole process that the air flows into the air channel through the air inlet and flows out of the air outlet is smoother, the vortex noise generated when the impeller rotates is reduced, and the working sound is optimized.
Description
Technical Field
The utility model relates to a volute tongue structure of a duplex centrifugal air duct.
Background
A tongue-shaped structure is arranged near an outlet of a volute of an existing centrifugal fan and is called a volute tongue, the volute tongue has the function of dividing airflow guided to the outlet, a flow field at the volute tongue of an air duct is complex, and the structural shape of the volute tongue has direct influence on the exhaust air quantity of the range hood, the air pressure inside the fan and noise. When the volute tongue is in a pointed tongue shape, the radial distance from the volute tongue to the impeller is shortest, the volute tongue is most beneficial to the air discharge amount, the air pressure in the fan and the oil smoke suction efficiency, but the noise is the largest; when the volute tongue is in a flat tongue shape, the radial distance between the volute tongue and the impeller is longest, the volute tongue is most unfavorable for the exhaust air quantity, the air pressure in the fan and the oil smoke suction efficiency, but the noise is lowest. Meanwhile, the minimum gap of the air duct of the traditional centrifugal fan is generally positioned at the volute tongue, the value of the minimum gap directly influences the air volume and noise of the fan, too small value can cause too high noise of the fan, too large value cannot meet the design requirement, and therefore a lot of troubles are brought to the design and model selection of the fan, and the working efficiency is influenced. Therefore, further improvements are necessary.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a volute tongue structure of a duplex centrifugal air duct, which overcomes the defects in the prior art.
According to a pair of centrifugal wind channel spiral tongue structure of this purpose design, including spiral case and the wind channel of setting in the spiral case, be provided with the impeller in this wind channel, the left and right sides is provided with the air intake, and the tip is provided with air outlet, its characterized in that: a volute tongue is arranged on the air outlet; a gap is formed between the impeller and the volute, and the gap between the impeller and the volute is gradually increased along the flowing direction of air in the air duct; the minimum clearance T between the impeller and the volute is positioned in front of the volute tongue; the air outlet is located behind the minimum gap T.
The two side wall surfaces of the volute tongue are respectively connected with the left inner side surface and the right inner side surface of the volute, wherein the two side wall surfaces of the volute tongue are also respectively inclined towards the middle position of the volute tongue and form a groove or a bulge.
The starting end and the terminating end of the volute tongue are tangent to the wall surface of the volute.
The starting end and the terminating end of the volute tongue respectively extend along the end direction of the volute tongue to form a first extending surface and a second extending surface; the first extension surface and the second extension surface are respectively arranged in a plane or an arc surface.
The first extending surface and the second extending surface form angular transition or arc transition; the end part of the volute tongue is formed at the angular or arc transition position of the first extension surface and the second extension surface.
The diameter of the impeller is D; t is more than or equal to 0.06D and less than or equal to 0.08D.
Through the improvement of the structure, the minimum gap between the impeller and the volute is arranged in front of the volute tongue, namely the minimum gap T is moved backwards into the air duct, so that the problem of turbulence generated when air flows in the air duct is avoided, the air output and the efficiency of the fan are improved, the air quantity is met, meanwhile, the impact between the impeller and the volute tongue can be reduced, the whole process that the air flows into the air duct through the air inlet and flows out of the air outlet is smoother, the eddy noise generated when the impeller rotates is further reduced, and the working sound is optimized.
Comprehensively, it has simple structure reasonable, the performance is excellent, low in manufacturing cost, and output amount of wind is big, characteristics such as work efficiency height and noise are low, and the practicality is strong.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 2 is a schematic cross-sectional structure diagram of the first embodiment of the present invention.
Fig. 3 is an enlarged schematic view of a portion a in fig. 2.
Fig. 4 is a schematic view of a volute tongue structure according to a first embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a second embodiment of the present invention.
Fig. 6 is a schematic cross-sectional structure diagram of a second embodiment of the present invention.
Fig. 7 is an enlarged schematic view of a structure at B in fig. 6.
Fig. 8 is a schematic view of a volute tongue structure according to a second embodiment of the present invention.
Detailed Description
The utility model is further described with reference to the following figures and examples.
First embodiment
Referring to fig. 1-4, the duplex centrifugal air duct volute tongue structure comprises a volute 1 and an air duct 2 arranged in the volute 1, wherein an impeller is arranged in the air duct 2, air inlets 3 are arranged at the left side and the right side, an air outlet 4 is arranged at the end part, and a volute tongue 5 is arranged on the air outlet 4; a gap is formed between the impeller and the volute 1, and the gap between the impeller and the volute is gradually increased along the flowing direction of air in the air duct 2; the minimum clearance T between the impeller and the volute 1 is positioned in front of the volute tongue 5; the air outlet 4 is located behind the minimum gap T.
The minimum clearance T between the impeller and the volute casing 1 is arranged in front of the volute tongue 5, namely the minimum clearance T is moved backwards into the air duct 2, so that the problem of turbulence generated when air flows in the air duct 2 is avoided, the air output and the efficiency of the fan are improved, the air quantity is met, meanwhile, the impact between the impeller and the volute tongue 5 can be reduced, the whole process that the air flows into the air duct 2 through the air inlet 3 and flows out of the air outlet 4 is smoother, the eddy noise generated when the impeller rotates is reduced, and the working sound is optimized.
Specifically, two side wall surfaces of the volute tongue 5 are respectively connected with the left inner side surface and the right inner side surface of the volute casing 1, wherein the two side wall surfaces of the volute tongue 5 are also respectively inclined towards the middle position of the volute tongue, and a groove 6 or a bulge is formed.
The left and right side wall surfaces of the volute tongue 5 of the present embodiment are respectively fixedly connected with the left and right inner side surfaces of the volute casing 1, and the bottom of the volute tongue is concave and fixedly arranged at the joint of the air duct 2 and the air outlet 4, and the two side wall surfaces of the volute tongue 5 are also respectively inclined towards the middle position of the volute tongue and form a groove 6.
Therefore, the volute tongue 5 can effectively adapt to the characteristics of small air volume at two sides and large air volume in the middle of the air duct 2, the air volume uniformity of the air duct 2 in the whole length direction is improved to a certain degree, and the eddy noise generated when the impeller rotates is reduced to a certain degree.
Meanwhile, the starting end 7 and the terminating end 8 of the volute tongue 5 are both tangent to the wall surface of the volute 1. Thereby effectively guiding the air to pass through the volute tongue 5 and out of the air outlet 4.
The starting end 7 and the terminating end 8 of the volute tongue 5 respectively extend along the end direction of the volute tongue 5 to form a first extending surface 9 and a second extending surface 10; the first extension surface 9 and the second extension surface 10 form an angle transition or an arc transition; the end of the volute tongue 5 is formed at the angular or arc transition of the first extension surface 9 and the second extension surface 10.
Specifically, the first extension surface 9 of the present embodiment is disposed in a plane, and the second extension surface 10 is disposed in an arc, and the two surfaces are in arc transition. The starting point end of the first extending surface 9 is tangent to the wall surface of the volute 1, specifically, the starting point end of the first extending surface 9 is tangent to the inner position of the air duct 2. The second extending surface 10 is arranged in a concave arc surface, and the starting point end of the second extending surface is tangent to the wall surface of the volute 1, specifically, the starting point end of the second extending surface 10 is tangent to the wall surface close to the air outlet 4.
The end of the volute tongue 5 is formed at the arc transition position of the first extension surface 9 and the second extension surface 10, namely, the upper end of the volute tongue 5 is arc-shaped.
Further, the diameter of the impeller is D, and D is the effective outer diameter of the impeller, namely the diameter of the excircle of the blade of the impeller; t is more than or equal to 0.06D and less than or equal to 0.08D, namely, the minimum clearance T between the impeller and the volute 1 and the diameter D of the impeller have a size proportional relation.
The wind channel 2 of this embodiment is because both sides air intake 3, the middle influence that is provided with the median septum, flows to the median septum by the impeller top in the wind channel 2 different, and both sides flow and present symmetrical state basically, adopts slope spiral tongue 5 can be according to the different unsmooth forms of both sides situation design of flowing, can effectively improve the inside situation of flowing in wind channel 2 to increase the amount of wind, reduce the vortex noise.
Second embodiment
Referring to fig. 5-8, the present twin centrifugal duct volute tongue structure differs from the first embodiment in that: the first extension surface 9 and the second extension surface 10 are both arc surfaces and have the same arc rate.
The first extending surface 9 of this embodiment is a concave arc surface, and the starting point end of the first extending surface 9 is tangent to the wall surface of the volute 1, specifically, the starting point end of the first extending surface 9 is tangent to the inner position of the air duct 2. The second extending surface 10 is arranged in a concave arc surface, and the starting point end of the second extending surface is tangent to the wall surface of the volute 1, specifically, the starting point end of the second extending surface 10 is tangent to the wall surface close to the air outlet 4.
The other parts not described are the same as those of the first embodiment.
The foregoing is a preferred embodiment of the present invention, and the basic principles, principal features and advantages of the utility model are shown and described. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the present invention, but various changes and modifications may be made without departing from the spirit and scope of the utility model as defined by the appended claims and their equivalents.
Claims (6)
1. The utility model provides a pair of centrifugal wind channel spiral tongue structure, includes spiral case (1) and sets up wind channel (2) in spiral case (1), is provided with the impeller in this wind channel (2), and the left and right sides is provided with air intake (3), and the tip is provided with air outlet (4), its characterized in that: a volute tongue (5) is arranged on the air outlet (4); a gap is formed between the impeller and the volute (1), and the gap between the impeller and the volute is gradually increased along the flowing direction of air in the air duct (2); the minimum clearance T between the impeller and the volute (1) is positioned in front of the volute tongue (5); the air outlet (4) is located behind the minimum gap T.
2. The twin centrifugal duct volute tongue structure of claim 1, wherein: two side wall surfaces of the volute tongue (5) are respectively connected with the left inner side surface and the right inner side surface of the volute casing (1), wherein the two side wall surfaces of the volute tongue (5) are also respectively inclined towards the middle position of the volute tongue, and a groove (6) or a bulge is formed.
3. The twin centrifugal duct volute tongue structure of claim 1, wherein: the starting end (7) and the terminating end (8) of the volute tongue (5) are tangent to the wall surface of the volute (1).
4. The twin centrifugal duct volute tongue structure of claim 3, wherein: the starting end (7) and the terminating end (8) of the volute tongue (5) respectively extend along the end direction of the volute tongue (5) to form a first extending surface (9) and a second extending surface (10); the first extension surface (9) and the second extension surface (10) are respectively arranged in a plane or an arc surface.
5. The twin centrifugal duct volute tongue structure of claim 4, wherein: the first extension surface (9) and the second extension surface (10) are in angular transition or arc transition; the end of the volute tongue (5) is formed at the angular or arc transition position of the first extension surface (9) and the second extension surface (10).
6. The twin centrifugal duct volute tongue structure of claim 1, wherein: the diameter of the impeller is D; t is more than or equal to 0.06D and less than or equal to 0.08D.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121025245.1U CN215409425U (en) | 2021-05-13 | 2021-05-13 | Duplex centrifugal air duct volute tongue structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121025245.1U CN215409425U (en) | 2021-05-13 | 2021-05-13 | Duplex centrifugal air duct volute tongue structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215409425U true CN215409425U (en) | 2022-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121025245.1U Active CN215409425U (en) | 2021-05-13 | 2021-05-13 | Duplex centrifugal air duct volute tongue structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215409425U (en) |
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2021
- 2021-05-13 CN CN202121025245.1U patent/CN215409425U/en active Active
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