CN110159591B - Volute tongue structure and centrifugal fan applying same - Google Patents
Volute tongue structure and centrifugal fan applying same Download PDFInfo
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- CN110159591B CN110159591B CN201910463502.0A CN201910463502A CN110159591B CN 110159591 B CN110159591 B CN 110159591B CN 201910463502 A CN201910463502 A CN 201910463502A CN 110159591 B CN110159591 B CN 110159591B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/422—Discharge tongues
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
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Abstract
The invention discloses a volute tongue structure, which comprises a first volute tongue and a second volute tongue positioned below the first volute tongue, wherein the outer side of the first volute tongue is in an outer convex shape which gradually protrudes outwards from the front end to the rear end to the middle, and the volute tongue structure is characterized in that: the outer side of the second volute tongue is in an inward concave shape which gradually protrudes inwards from the front end to the rear end to the middle. A centrifugal fan applying the volute tongue structure is also disclosed. Compared with the prior art, the invention has the advantages that: through staggering half cycle phase place with first snail tongue and second snail tongue, can carry out the rectification effect to the desludging on snail tongue surface better, the noise frequency that produces at the unsteady effect of first snail tongue surface air current and the noise intermodulation that produces of second snail tongue air current effect, and then improve the sound quality, reduce the noise.
Description
Technical Field
The invention relates to a power device, in particular to a volute tongue structure and a centrifugal fan applying the volute tongue structure.
Background
The forward multi-wing centrifugal fan is the main power system of the range hood and other ventilation equipment, and has the characteristics of compact structure, low noise, high pressure coefficient, large flow coefficient and the like. The airflow periodically acts on the volute tongue to form unsteady pressure pulsation on the surface of the volute tongue, and then the larger noise of the fan is generated. Numerical simulation results show that the airflow speed at the outlet of the impeller of the double-suction fan is distributed in a quadratic curve along the axial direction, the speed at the middle disc position is high, the airflow speed at the front disc position and the rear disc position is low, and the efficiency of the centrifugal fan is reduced by backflow at the gap between the volute tongue and the impeller.
In order to reduce noise and improve centrifugal fan efficiency, some proposals have also been disclosed. The chinese patent application No. 201510782850.6 discloses a volute of a fan with tilted stepped volute tongue, which includes: the volute comprises a volute front plate, a volute rear plate and a ring wall clamped between the volute front plate and the volute rear plate, wherein an air outlet of a fan is reserved on the ring wall, a volute tongue is arranged at the air outlet and is an inclined stepped volute tongue, a body of the inclined stepped volute tongue is provided with a first inclined-plane volute tongue and a second inclined-plane volute tongue, and a multiphase buffer area is formed on the inclined stepped volute tongue through the first inclined-plane volute tongue and the second inclined-plane volute tongue and is used for buffering the impact of airflow on the inclined stepped volute tongue. The stepped volute tongue mainly reduces backflow at the volute tongue so as to increase the static pressure of the fan and improve the efficiency of the fan, and the noise reduction effect is limited.
Also like the chinese patent with application number 201721111373.1 of the present applicant, a radial flow fan volute tongue structure includes a main volute tongue, wherein the tongue tip portion of the main volute tongue forms an outward convex portion protruding outward toward the airflow side, an auxiliary volute tongue protruding downward is disposed at the front side bottom of the main volute tongue, and an auxiliary volute tongue protruding downward is disposed at the rear side bottom of the main volute tongue. By adopting the volute tongue structure with the bulges on the two sides for secondary throttling of airflow, the rectification effect is limited, and the possibility of generating new abnormal sound is not eliminated.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a volute tongue structure aiming at the problems in the prior art, so that the phenomenon of flow shedding and pressure pulsation on the surface of the volute tongue are weakened, and further, the noise is reduced.
The second technical problem to be solved by the invention is to provide a centrifugal fan applying the volute tongue structure.
The technical scheme adopted by the invention for solving the first technical problem is as follows: the utility model provides a snail tongue structure, includes first snail tongue and is located the second snail tongue of first snail tongue below, the outside of first snail tongue is by the front and back both ends to the centre, gradually outside outstanding outer convex, its characterized in that: the outer side of the second volute tongue is in an inward concave shape which gradually protrudes inwards from the front end to the rear end to the middle.
The technical scheme adopted by the invention for solving the second technical problem is as follows: the centrifugal fan applying the volute tongue structure comprises a volute and an impeller arranged in the volute, wherein the impeller is a double-air-inlet impeller, and the centrifugal fan is characterized in that: the inner side of the first volute tongue and the inner side of the second volute tongue are connected with the inner wall of the volute, the outer side of the first volute tongue and the outer side of the second volute tongue are respectively one side far away from the connection part with the volute, the front and back direction is the axial direction of the impeller, and the concave most sunken part of the second volute tongue is closer to the connection part with the volute relative to the convex most protruded part of the first volute tongue.
Furthermore, the rules of the first and second volute tongues changing along the axial direction are opposite to and consistent with the changes of the impeller along the axial speed respectively, the impeller comprises a front disc, a rear disc and a middle disc arranged between the front disc and the rear disc, the most protruding part of the outward convex shape of the first volute tongue and the most recessed part of the inward concave shape of the second volute tongue correspond to the middle disc respectively, and therefore the first volute tongue and the second volute tongue form an asymmetric structure.
Further, in order to better reduce secondary backflow at the front disc and the rear disc and improve the efficiency of the fan, the first volute tongue is provided with a first front side surface corresponding to the front disc of the impeller, a first rear side surface corresponding to the rear disc of the impeller and a first middle section corresponding to the middle disc of the impeller, the first volute tongue further comprises a first tongue portion located on the outer side, the sections of the first tongue portion in the axial direction of the impeller are all arc surfaces, the first tongue portion protrudes towards the direction far away from the connection position with the volute, and the radius of the first tongue portion at the first front side surface is R1A radius of the first tongue at the first rear side surface is R3The radius of the first tongue at the first intermediate section plane is R2The three radii satisfy the following relationship: r1、R3Are all greater than R2。
Preferably, the three radii of the first tongue portion satisfy the following relationship: r1:R2＝1.4～1.6；R3:R2＝1.1～1.3。
Furthermore, in order to better reduce the secondary backflow at the front disc and the rear disc and improve the efficiency of the fan, the second volute tongue is provided with a second front side surface corresponding to the front disc of the impeller, a second rear side surface corresponding to the rear disc of the impeller and a second middle section corresponding to the middle disc of the impeller, the second front side surface is formed by downward extension of the bottom edge of the first front side surface, the second rear side surface is formed by downward extension of the bottom edge of the first rear side surface, and the second middle section is formed by downward extension of the bottom edge of the second middle section; the second volute tongue also comprises a second tongue part positioned on the outer side, the cross section of the first tongue part in the axial direction of the impeller is a circular arc surface, the first tongue part protrudes towards the direction far away from the connection part with the volute, and the radius of the second tongue part at the second front side surface is R4A radius of the second tongue at the second rear side surface is R6A radius of the second tongue at the second intermediate section plane is R5The three radii satisfy the following relationship: r4、R6Are not less than R5。
Preferably, the three radii of the second tongue portion satisfy the following relationship: r4:R5＝1～1.3；R6:R5＝1～1.3。
The first volute tongue is also provided with a top surface, the intersection point of the top surface and the first front side surface, which is far away from the connection point with the volute casing, is a vertex, and the included angle between a first connecting line between the top end of the first tongue on the first front side surface and the vertex and the horizontal direction is beta1The second connecting line between the upper end point and the vertex of the first tongue part on the first rear side surface and the first connecting line form an included angle beta2The third connecting line of the first tongue part between the upper end point and the top point of the first middle section plane and the second connecting line form an included angle beta3(ii) a The first tongue portion is in transition between the lower end point of the first front side face of the first tongue portion and the upper end point of the second tongue portion on the second front side face through a first circular arc, the circle center of the first circular arc is the center point of the impeller at the corresponding position of the front disc, and the radius of the first circular arc is R7The lower end point of the first tongue portion on the first rear side surface and the upper end point of the second tongue portion on the second rear side surface are in transition through a second circular arc, the circle center of the second circular arc is the center point of the impeller at the corresponding position of the rear disc, and the radius of the second circular arc is R9The first tongue portion is in transition between the lower end point of the first middle section and the upper end point of the second tongue portion in the second middle section through a third circular arc, the circle center of the third circular arc is the center point of the impeller at the corresponding position of the central disc, and the radius of the third circular arc is R8(ii) a The connecting line between the end point of the second arc close to the joint with the volute and the central point of the corresponding impeller forms an included angle alpha with the vertical direction1The connecting line between the end point of the first arc close to the connection with the volute and the central point of the corresponding impeller and the included angle between the connecting line and the vertical direction are alpha2The connecting line between the end point of the third arc close to the joint with the volute and the central point of the corresponding impeller and the included angle between the connecting line and the vertical direction are alpha3(ii) a The clearance between the volute tongue structure and the impeller is t, and the parameters meet the following requirementsThe relationship is as follows: alpha is alpha1＝19°～21°，α2＝α1±(2°～4°)，α3＝α1±(5°～7°)，β1＝116°～118°，β2＝4°～6°，β3＝3°～5°，R7＝R8＝R9＝t+(3～5)mm。
Compared with the prior art, the invention has the advantages that: the first volute tongue can weaken the impact of airflow on the volute tongue and weaken the flow shedding phenomenon and pressure pulsation on the surface of the volute tongue structure, so that the noise is reduced, the second volute tongue can buffer and rectify the backflow at the clearance of the volute tongues, the flow shedding of the airflow on the volute tongues is weakened, and the static pressure and the efficiency of the fan are improved; the first volute tongue and the second volute tongue are staggered by half period phase, so that the rectification effect on the surface of the volute tongue can be better realized, the noise frequency generated by the airflow unsteady effect on the surface of the first volute tongue and the noise generated by the airflow effect of the second volute tongue are mutually modulated, the sound quality is improved, and the noise is reduced.
Drawings
FIG. 1 is a schematic view of a centrifugal fan according to an embodiment of the present invention;
FIG. 2 is a schematic view (from top to bottom) of a volute tongue structure according to an embodiment of the present invention;
FIG. 3 is a schematic view of the volute tongue structure (from bottom to top) according to an embodiment of the present invention;
FIG. 4 is a schematic view of the volute tongue structure (from front to back) according to an embodiment of the present invention;
FIG. 5 is a schematic view of an impeller of a centrifugal fan and its distribution of air flow velocities in an axial direction according to an embodiment of the present invention;
FIG. 6 is a graph showing the comparison of the performance curves of the volute tongue structure of the present invention and the volute tongue structure of the prior art;
FIG. 7 is a graph comparing the performance curves of the volute tongue structure of the present invention and the volute tongue structure of the prior art.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Referring to fig. 1, 5 and 6, a centrifugal fan, which can be used for a range hood and a purification device, includes a volute 1 and an impeller 2 disposed in the volute 1. An air inlet 11 and an air outlet 12 are formed on the volute 1, and a volute tongue structure 3 is arranged on the inner wall of the volute 1 and corresponds to the air outlet 12. The impeller 2 is a double-wind impeller, and includes a front disk 21, a rear disk 22, a middle disk 23 disposed between the front disk 21 and the rear disk 22, and a plurality of blades 24 disposed between the front disk 21 and the rear disk 22 and passing through the middle disk 23. The impeller 2 has an axis X, each point on the axis X is a central point O, and the peripheral contour line of the impeller 2 is L.
V1The absolute velocity magnitude, V, of the air flow at the outlet of the front disk 21 of the impeller 22The absolute velocity magnitude, V, of the air flow at the outlet of the middle disk 23 of the impeller 23The absolute velocity of the air flow at the outlet of the back disk 22 of the impeller 2. Wherein, V2:V1＝1.4～1.6；V2:V3＝1.1～1.3。
Referring to fig. 2 to 5, the volute tongue structure 3 includes a first volute tongue 31 and a second volute tongue 32, which may be integrally formed. The outer side of the first volute tongue 31 far away from the joint with the volute 1 is in an outward convex shape protruding from the front end and the rear end to the middle and gradually far away from the joint with the volute 1, the second volute tongue 32 is arranged below the first volute tongue 31 and is in an inward concave shape opposite to the first volute tongue 31, namely, the outer side of the second volute tongue 32 far away from the joint with the volute 1 is in an inward concave shape protruding from the front end and the rear end to the middle and gradually toward the joint with the volute 1. The most protruding part of the first volute tongue 31 and the most recessed part of the second volute tongue 32 correspond to the middle disc 23 respectively.
The first volute tongue 31 is an R-variable volute tongue, and the second volute tongue 32 is an equal R or R-variable volute tongue. Because the front disk 21, the rear disk 22 and the middle disk 23 of the impeller 2 are arranged in an asymmetric structure, the position speed of the middle disk 23 is high, and the air flow speed at the front disk and the rear disk is low, the first volute tongue 31 and the second volute tongue 32 are in an asymmetric structure.
Therefore, the overall axially-varying law (outward projection) of the first volute tongue 31 is opposite to the axially-distributed quadratic curve of the outlet airflow speed of the impeller 2, and has a half-cycle phase difference, and the overall axially-varying law (inward recess) of the second volute tongue 32 conforms to the axially-distributed quadratic curve of the outlet airflow speed of the impeller 2.
The first volute tongue 31 includes a first tongue portion 311 on the outer side. The first volute tongue 31 has a first front side 312 corresponding to the front disk 21 of the impeller 2, a first rear side 313 corresponding to the rear disk 22 of the impeller 2, and a first intermediate section 314 corresponding to the central disk 23 of the impeller 2.
The first tongue portions 311 each have a circular arc surface in cross section in the axial direction of the impeller 2, and protrude in a direction away from the connection with the scroll casing 1. The first tongue 311 has a radius R at the first front side 3121The first tongue 311 has a radius R at the first rear side 3133The first tongue 311 has a radius R at the first intermediate section plane 3142. The variable R radius of the first tongue 311 in this application is: r1:R2＝1.4～1.6；R3:R21.1 to 1.3. Preferably, R1＝6mm，R1:R2＝1.42；R3:R2＝1.17。
The second volute tongue 32 includes a first tongue portion 321 on the outer side. The second volute tongue 32 has a second front side 322 (extending downward from the bottom edge of the first front side 312) corresponding to the front disk 21 of the impeller 2, a second rear side 323 (extending downward from the bottom edge of the first rear side 313) corresponding to the rear disk 22 of the impeller 2, and a second intermediate section 324 (extending downward from the bottom edge of the first intermediate section 314) corresponding to the middle disk 23 of the impeller 2.
The second tongue portions 321 are each a circular arc surface in cross section in the axial direction of the impeller 2, and protrude in a direction away from the connection with the scroll casing 1. The second volute tongue 32 includes a second tongue portion 321 on the outer side. The second tongue 321 has a radius R at the second front side 3224The second tongue 321 has a radius R at the second rear side 3236The second tongue 321 has a radius R in the second middle section 3245. The variable R radius of the second tongue 321 in this application is: r4:R5＝1～1.3；R6:R 51 to 1.3. Preferably, R2＝R5＝R6＝6mm。
The second volute tongue 32 is closer to the inner side of the volute 1 (the concave most part of the second volute tongue 32 is closer to the connection part with the volute than the convex most part of the first volute tongue 31), and is located at the downstream position of the first volute tongue 31 along the rotation direction of the impeller 2, the air flow speed at the position is relatively low, and the second volute tongue 32 can buffer and rectify the flowing wake of the first volute tongue 31 and the backflow at the volute tongue gap, so that the flow shedding of the air flow at the volute tongue is reduced.
The first tongue 31 further has a top surface 315, which is a horizontal surface and is a top surface of the whole volute tongue structure 3, an intersection point of the top surface 315 and the first front side surface 312, which is far from the connection point with the volute casing 1, is a vertex O1, and an included angle β is formed between a first connection line l1 between an upper endpoint (a vertex above the arc) of the first tongue 311 on the first front side surface 312 and the vertex O1 and the horizontal direction1An angle β between a first line l1 and a second line l2 between an upper end point (a vertex of the arc located above) of the first tongue portion 311 on the first rear side 313 and the vertex O1 is2The angle between the third line l3 and the second line l2 of the first tongue 311 between the top end point (the top point of the arc) and the top point O1 of the first middle cross section 314 and the second middle cross section is β3。
The first tongue portion 311 is transited between the lower end point (the top point of the arc located below) of the first front side surface 312 and the upper end point of the second tongue portion 321 on the second front side surface 322 by a first arc L1, the center point of the first arc L1 is the center point O of the impeller 2 corresponding to the front disk 21, and the radius of the first arc L1 is R7(ii) a The first tongue portion 311 is transited between the lower end point (the top point of the arc located below) of the first rear side surface 313 and the upper end point of the second tongue portion 321 on the second rear side surface 323 by a second arc L2, the center point of the second arc L2 is the center point O of the impeller 2 at the corresponding position of the rear disc 22, and the radius of the second arc L2 is R9(ii) a The first tongue 311 transitions between the lower end point of the first intermediate cross-section 314 (the top point of the arc located below) and the upper end point of the second tongue 321 in the second intermediate cross-section 324 via a third arc L3, the center point of the third arc L3 being the center point O of the impeller 2 at the corresponding point of the center plate 23 and having a radius R8。
The included angle between the vertical direction and the connecting line between the end point of the second circular arc L2 close to the joint with the volute 1 and the central point O of the corresponding impeller 2 is alpha1(ii) a The included angle between the vertical direction and the connecting line between the end point of the first circular arc L1 close to the joint with the volute 1 and the central point O of the corresponding impeller 2 is alpha2(ii) a The third arc L3 is close to the volute1 the included angle between the connecting line between the end point of the connecting part and the central point O of the corresponding impeller 2 and the vertical direction is alpha3。
The second volute tongue 32 also has a bottom face 325, which is a plane, as the bottom face of the entire volute tongue structure 3, and a plane parallel to the bottom face 325 of the second volute tongue 32 and tangent to the contour line L of the impeller 2 is at a distance t from the bottom face 325 of the second volute tongue 32 (i.e., the gap between the volute tongue structure 3 and the impeller 2 is t).
The above parameters satisfy the following relationship: alpha is alpha1＝19°～21°，α2＝α1±(2°～4°)，α3＝α1±(5°～7°)；β1＝116°～118°，β2＝4°～6°，β3＝3°～5°；t＝(10～12)mm，R7＝R8＝R9T + (3-5) mm, preferably, R7＝130mm，t＝10mm。
The volute tongue structure 3 acts on the outflow of the impeller 2 periodically, the first volute tongue 31 can weaken the impact of airflow on the volute tongue structure, the phenomenon of flow shedding and pressure pulsation on the surface of the volute tongue structure 3 are weakened, and then noise is reduced. The radius of the volute tongues on the two sides of the front and rear disks is larger than that of the volute tongues on the middle disk, so that secondary backflow at the front and rear disks can be well reduced, and the efficiency of the fan is improved. The second volute tongue 32 is closer to the inner side of the volute 1 and is positioned in a region with relatively low airflow speed in the volute 1, the change rule of the second volute tongue along the axial direction accords with the quadratic curve distribution of the airflow, the backflow at the volute tongue gap can be buffered and rectified, the flow shedding of the airflow at the volute tongue is weakened, and the static pressure and the efficiency of the fan are improved. In addition, the first volute tongue 31 and the second volute tongue 32 are staggered from each other by half period phase, so that the flow shedding on the surface of the volute tongue can be well rectified, and the noise frequency generated by the airflow unsteady action on the surface of the first volute tongue 31 and the noise generated by the airflow action of the second volute tongue 32 are mutually modulated, so that the sound quality is improved, and the noise is reduced. Referring to fig. 7, a comparison of performance curves of the volute tongue structure of the embodiment of the present invention and the volute tongue structure of the prior art is shown, wherein the performance curves of the volute tongue structure of the present invention are achieved, and the dashed lines represent the performance curves of the volute tongue structure of the prior art.
Claims (8)
1. The utility model provides a snail tongue structure, includes first snail tongue (31) and is located second snail tongue (32) of first snail tongue (31) below, the outside of first snail tongue (31) is by the front and back both ends to the centre, gradually outside outstanding outer convex, its characterized in that: the outer side of the second volute tongue (32) is in an inward concave shape which gradually protrudes inwards from the front end to the rear end to the middle.
2. A centrifugal fan applying the volute tongue structure of claim 1, comprising a volute (1) and an impeller (2) arranged in the volute (1), wherein the impeller (2) is a double-inlet impeller, and is characterized in that: the inner side of the first volute tongue (31) and the inner side of the second volute tongue (32) are connected with the inner wall of the volute (1), the outer side of the first volute tongue (31) and the outer side of the second volute tongue (32) are respectively far away from one side of the connection part with the volute (1), the front and back direction is the axial direction of the impeller (2), and the concave most sunken part of the second volute tongue (32) is closer to the connection part with the volute (1) relative to the convex most protruded part of the first volute tongue (31).
3. The centrifugal fan of claim 2, wherein: the impeller (2) comprises a front disc (21), a rear disc (22) and a middle disc (23) arranged between the front disc (21) and the rear disc (22), wherein the most protruding part of the outward convex shape of the first volute tongue (31) and the most recessed part of the inward concave shape of the second volute tongue (32) correspond to the middle disc (23) respectively, and therefore the first volute tongue (31) and the second volute tongue (32) form an asymmetric structure.
4. The centrifugal fan of claim 3, wherein: the first volute tongue (31) is provided with a first front side face (312) corresponding to a front disc (21) of the impeller (2), a first rear side face (313) corresponding to a rear disc (22) of the impeller (2) and a first middle section plane (314) corresponding to a middle disc (23) of the impeller (2), the first volute tongue (31) further comprises a first tongue portion (311) located on the outer side, the sections of the first tongue portion (311) in the axial direction of the impeller (2) are all arc surfaces and protrude towards the direction far away from the connection position with the volute (1), and the radius of the first tongue portion (311) at the first front side face (312) is R1Said first tongue (311) being atA radius at the first rear side (313) of R3The first tongue (311) having a radius R at a first intermediate section plane (314)2The three radii satisfy the following relationship: r1、R3Are all greater than R2。
5. The centrifugal fan of claim 4, wherein: the three radii of the first tongue (311) satisfy the following relationship: r1:R2＝1.4～1.6；R3:R2＝1.1～1.3。
6. The centrifugal fan according to claim 4 or 5, wherein: the second volute tongue (32) is provided with a second front side surface (322) corresponding to the front disc (21) of the impeller (2), a second rear side surface (323) corresponding to the rear disc (22) of the impeller (2) and a second middle section plane (324) corresponding to the middle disc (23) of the impeller (2), the second front side surface (322) is formed by downward extension of the bottom edge of the first front side surface (313), the second rear side surface (323) is formed by downward extension of the bottom edge of the first rear side surface (313), and the second middle section plane (324) is formed by downward extension of the bottom edge of the second middle section plane (313); the second volute tongue (32) further comprises a second tongue portion (321) located on the outer side, the cross section of the second tongue portion (321) in the axial direction of the impeller (2) is a circular arc surface, and the second tongue portion protrudes towards the direction far away from the connection position of the second tongue portion and the volute (1), and the radius of the second tongue portion (321) at the second front side surface (322) is R4The second tongue (321) has a radius R at the second rear flank (323)6The second tongue (321) has a radius R at the second intermediate section plane (324)5The three radii satisfy the following relationship: r4、R6Are not less than R5。
7. The centrifugal fan of claim 6, wherein: the three radii of the second tongue (321) satisfy the following relationship: r4:R5＝1～1.3；R6:R5＝1～1.3。
8. According to the rightThe centrifugal fan of claim 6, characterized in that: the first volute tongue (31) is also provided with a top surface (315), the intersection point of the top surface (315) and the first front side surface (312) and the intersection point far away from the connection point of the top surface (315) and the volute (1) is a vertex (O1), and the included angle beta between the horizontal direction and a first connecting line (l1) of the first tongue (311) between the upper end point and the vertex (O1) on the first front side surface (312) is beta1The angle between a second line (l2) between the upper end point of the first tongue (311) on the first rear side (313) and the vertex (O1) and the first line (l1) is beta2The angle between the third line (l3) and the second line (l2) of the first tongue (311) between the upper end point and the vertex (O1) of the first intermediate section plane (314) is beta3(ii) a The first tongue portion (311) is in transition between the lower end point of the first front side face (312) and the upper end point of the second tongue portion (321) on the second front side face (322) through a first circular arc (L1), the center of the first circular arc (L1) is the center point (O) of the impeller (2) at the corresponding position of the front disc (21), and the radius of the first circular arc is R7The first tongue portion (311) is in transition between the lower end point of the first rear side face (313) and the upper end point of the second tongue portion (321) on the second rear side face (323) through a second circular arc (L2), the center of the second circular arc (L2) is the center point (O) of the impeller (2) at the corresponding position of the rear disc (22), and the radius of the second circular arc is R9The first tongue portion (311) is transited between the lower end point of the first middle section plane (314) and the upper end point of the second tongue portion (321) on the second middle section plane (324) through a third circular arc (L3), the center point of the third circular arc (L3) is the center point (O) of the impeller (2) at the corresponding position of the central disc (23), and the radius of the third circular arc is R8(ii) a The included angle between the connecting line between the end point of the second circular arc (L2) close to the joint with the volute (1) and the central point (O) of the corresponding impeller (2) and the vertical direction is alpha1The included angle between the connecting line between the end point of the first circular arc (L1) close to the joint with the volute (1) and the central point (O) of the corresponding impeller (2) and the vertical direction is alpha2The included angle between the connecting line between the end point of the third arc (L3) close to the joint with the volute (1) and the central point (O) of the corresponding impeller (2) and the vertical direction is alpha3(ii) a The clearance between the volute tongue structure and the impeller (2) is t, and the parameters satisfy the following relations: alpha is alpha1＝19°～21°，α2＝α1±(2°～4°)，α3＝α1±(5°～7°)，β1＝116°～118°，β2＝4°～6°，β3＝3°～5°，R7＝R8＝R9＝t+(3～5)mm。
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| CN109424586B (en) * | 2017-08-31 | 2024-01-16 | 宁波方太厨具有限公司 | Volute tongue structure for radial flow fan |
| CN111521365B (en) * | 2020-05-18 | 2021-06-08 | 南京航空航天大学 | Adjustable frequency and phase unsteady flow control experimental device based on rotary slot grating |
| CN112879349B (en) * | 2021-01-15 | 2022-04-19 | 宁波方太厨具有限公司 | Air inlet device, fan system with air inlet device and cleaning machine |
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