CN210178651U - Improvement type is spiral case for centrifugal fan - Google Patents
Improvement type is spiral case for centrifugal fan Download PDFInfo
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- CN210178651U CN210178651U CN201920829873.1U CN201920829873U CN210178651U CN 210178651 U CN210178651 U CN 210178651U CN 201920829873 U CN201920829873 U CN 201920829873U CN 210178651 U CN210178651 U CN 210178651U
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- volute
- motor
- cover plate
- volute tongue
- tongue
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Abstract
The utility model relates to an improved volute for a centrifugal fan, which comprises a volute, wherein the volute is provided with a volute tongue, the volute tongue comprises an upper volute tongue and a lower volute tongue, an outward protruding volute tongue is arranged between the upper volute tongue and the lower volute tongue, the front end of the volute tongue shell is lower than the rear end, the rear side of the volute is provided with a rear cover plate, the rear cover plate and the volute are integrally formed, the rear cover plate is provided with a shaft hole, the inner side of the shaft hole is provided with a fixed shaft, the fixed shaft is connected with the shaft hole through a bearing, the outer side of the rear cover plate is provided with a motor, a motor shaft of the motor is positioned in the fixed shaft, the motor is positioned in a motor base, the inner side of the motor base is provided with a base, the base is fixedly connected with the bottom of the volute, the front side of the volute is provided with a front cover plate, the front cover plate is provided with, the noise of the centrifugal fan caused by the volute in work is reduced, and the effect of treating noise pollution is achieved.
Description
Technical Field
The utility model relates to an improvement type spiral case for centrifugal fan.
Background
The centrifugal fan is a driven fluid machine which increases the pressure of gas and discharges the gas by means of input mechanical energy. One of the great problems of the centrifugal fan in use is the noise problem. The noise of the centrifugal fan mainly comes from pneumatic noise and mechanical noise, and the improvement of the fan by the pneumatic noise storage also comprises the proper improvement of the volute to reduce the noise.
For the volute, the pneumatic noise comes from the periodic pressure and speed pulsation when the fan rotates and the rotating blade channel passes over the volute tongue, the volute tongue is impacted to generate noise, and the air of the air inlet enters the fan to generate noise; in addition, the motor is instable to be connected with the volute only through the connecting hole, the motor shaft is easy to deviate to drive the fan to be staggered, and noise is increased and even the working efficiency of the fan is influenced.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, a spiral case for improvement type centrifugal fan is provided, the technical scheme of the utility model is that:
a volute for an improved centrifugal fan comprises a volute, wherein the volute is provided with a volute tongue, the volute tongue comprises an upper volute tongue and a lower volute tongue, an outward protruding volute tongue is arranged between the upper volute tongue and the lower volute tongue to increase the distance between the volute tongue and the fan, one side of the front end of the volute, which is located on one side of the rear end of the volute, of the volute tongue is lower than the other side of the rear end of the volute, the inclination angle of the volute tongue is determined according to a wind wheel, airflow of two blades simultaneously acts on the volute tongue to enable the phases of the airflow to be staggered, a rear cover plate is arranged on the rear side of the volute and integrally formed with the volute, a shaft hole is formed in the rear cover plate, a fixed shaft is arranged on the inner side of the shaft hole, the fixed shaft is connected with the shaft hole through a bearing, a motor is arranged on the outer side of the rear cover plate, the stability of a fan shaft is improved, the motor is positioned in the motor base, the inner side of the motor base is provided with a damping layer, the motor vibration is weakened by the damping layer, the vibration cannot be transmitted to the base, the mechanical vibration is reduced, the mechanical noise is reduced, the bottom of the motor base is provided with a base, the base is fixedly connected with the bottom of the volute, the front side of the volute is provided with a front cover plate, the front cover plate is provided with an air inlet, the air inlet is provided with a flow guide ring, the central line of the air inlet is collinear with the center of the flow guide ring and the central axis of the fixed shaft, the flow guide ring is provided with flow guide sheets which are uniformly distributed on the inner side of the flow guide ring, the flow guide sheets are inclined flow guide sheets, air enters the fan through the flow guide ring matched with the rotation direction of the fan, the resistance of the air can be reduced, the rubber outer layer and the vibration generate small noise, and the vibration noise of the flow guide ring can be blocked.
As a preferred technical scheme, the air inlet is an arc-shaped air inlet, the guide ring is located at the position where the cross-sectional area of the arc-shaped air inlet is the smallest, the cross-sectional area is small, the flow velocity is large, the influence of the resistance of the guide vane on the air inlet is small, the distance between the guide ring and the fan is small, and the wind direction cannot be greatly changed before the wind passing through the guide ring enters the fan.
According to the preferable technical scheme, a plurality of convex blocks are arranged in the fixing shaft, an anti-slip layer is arranged on the inner side of the fixing shaft, a groove matched with the fixing shaft box is formed in the part, close to the motor, of the motor shaft, and the fixing shaft and the motor shaft are axially and rotatably fixed to avoid deviation.
As a preferable technical scheme, the base and the volute are integrally formed, and noise generated by mechanical vibration is reduced.
According to the scheme, the volute tongue reduces the impact force of wind on the volute tongue and reduces noise, but the noise caused by the flow between the impeller air outlet and the volute shell wall is slightly increased, and the noise generated by the volute section is reduced by adopting the sound absorption material.
As preferred technical scheme, the spiral case leading flank is equipped with the spill annular, be equipped with on the front shroud with the protruding connecting block that the concave ring groove case was joined in marriage to suitable, protruding connecting block with front shroud integrated into one piece, be equipped with a plurality of groove connecting holes on the spill annular, protruding connecting block be equipped with the groove connecting hole matches the piece connecting hole that suits, increases the leakproofness of front shroud and spiral case junction, avoids the junction leakproofness that long-time operation front shroud produced the micro-deformation and reduces.
By adopting the technical scheme, the improved volute for the centrifugal fan comprises a volute, wherein the volute is provided with a volute tongue, the volute tongue comprises an upper volute tongue and a lower volute tongue, an outward protruding volute tongue is arranged between the upper volute tongue and the lower volute tongue, one side of the volute tongue, which is positioned at the front end of the volute, is lower than one side of the volute tongue, which is positioned at the rear end of the volute, the rear side of the volute is provided with a rear cover plate, the rear cover plate and the volute are integrally formed, the rear cover plate is provided with a shaft hole, the inner side of the shaft hole is provided with a fixed shaft, the fixed shaft is connected with the shaft hole through a bearing, the outer side of the rear cover plate is provided with a motor, a motor shaft of the motor is positioned in the fixed shaft, the motor is positioned in a motor base, the inner side of the motor base is provided with a damping layer, the bottom of the, the front cover plate is provided with an air inlet, the air inlet is provided with a flow guide ring, the center line of the air inlet is collinear with the center of the flow guide ring and the central axis of the fixed shaft, the flow guide ring is provided with flow guide sheets, the flow guide sheets are uniformly distributed on the inner side of the flow guide ring, the flow guide sheets are inclined flow guide sheets, and the outer side of the flow guide ring and the outer side of the flow guide sheets are both provided with rubber outer layers; firstly, the vibration generated by the rotation of the motor is weakened, and meanwhile, the motor is stably supported, so that the mechanical noise generated by the motor is reduced; secondly, the motor shaft and the fixed shaft are axially locked, so that the displacement of the fan caused by the deviation of the motor shaft is avoided; the distance between the volute tongue and the impeller is increased, the impact force on the volute tongue is reduced, meanwhile, the sound absorption material reduces the noise increased between the air outlet of the impeller and the wall of the volute casing due to the increase of the distance of the volute tongue, and the pneumatic noise is reduced; fourthly, the front cover plate is connected with the volute in a plugging and fixing mode through a fixing piece, so that noise generated by gaps due to micro deformation of the front cover plate of the fan caused by various factors is avoided; fifthly, wind gets into before the fan through the guide vane effect on the water conservancy diversion ring, and the wind speed direction adjusts, and the production of noise has been reduced to more smooth and easy entering fan, the utility model discloses simple structure improves through the adjustment to the spiral case structure, has reduced because the centrifugal fan that the spiral case caused has reached the effect of administering noise pollution at the during operation noise.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 illustrates a volute and a back cover plate according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a front cover plate according to an embodiment of the present invention;
in the figure: 1-a volute; 2-upper volute tongue; 3-lower volute tongue; 4-protruding volute tongue; 5-a rear cover plate; 6-shaft hole; 7-a fixed shaft; 8, a motor; 9-a motor base; 10-a shock-absorbing layer; 11-a base; 12-a front cover plate; 13-air inlet; 14-a flow guide ring; 15-flow deflectors; 16-an anti-slip layer; 17-a sound absorbing material; 18-a concave ring groove; 19-convex connecting block; 20-slot attachment holes; 21-connecting holes; 22-bumps.
Detailed Description
For further explanation of the invention, reference is made to the following description taken in conjunction with the accompanying drawings:
example (b): as shown in figures 1 to 3 of the drawings,
a volute for an improved centrifugal fan comprises a volute 1, wherein the volute 1 is provided with a volute tongue, the volute tongue comprises an upper volute tongue 2 and a lower volute tongue 3, an outward protruding volute tongue 4 is arranged between the upper volute tongue 2 and the lower volute tongue 3 to increase the distance between the volute tongue and the fan, one side of the front end of the volute 1 of the volute tongue is lower than one side of the rear end of the volute tongue, the inclination angle of the volute tongue is determined according to a wind wheel, airflow of two blades simultaneously acts on the volute tongue to enable the phases of the airflow to be staggered, the rear side of the volute 1 is provided with a rear cover plate 5, the rear cover plate 5 and the volute 1 are integrally formed, a shaft hole 6 is arranged on the rear cover plate 5, a fixed shaft 7 is arranged on the inner side of the shaft hole 6, the fixed shaft 7 is connected with the shaft hole 5 through a bearing, the outer side of the rear cover plate 5 is provided with a motor 8, a motor shaft of the, the inner side of the motor base 9 is provided with a damping layer 10, the motor vibration is weakened by the damping layer, the vibration cannot be transmitted to the base, the mechanical vibration is reduced, the mechanical noise is reduced, the bottom of the motor base 9 is provided with a base 11, the base 11 is fixedly connected with the bottom of the volute 1, the front side of the volute is provided with a front cover plate 12, the front cover plate 12 is provided with an air inlet 13, the air inlet 13 is provided with a flow guide ring 14, the central line of the air inlet 13 is collinear with the center of the flow guide ring 14 and the central axis of the fixed shaft 7, the flow guide ring 14 is provided with flow guide sheets 15, the flow guide sheets 15 are uniformly distributed on the inner side of the flow guide ring 14, the, can reduce the resistance of air, the noise reduction, the water conservancy diversion ring outside all is equipped with the rubber skin with the water conservancy diversion piece outside, and the noise that the rubber skin and tremble produced is little, and on the other hand can the separation water conservancy diversion ring the tremble noise.
The air inlet 13 is an arc-shaped air inlet, the guide ring 14 is located at the position where the cross-sectional area of the arc-shaped air inlet is the smallest, firstly, the cross-sectional area is small, the flow velocity is large, the influence of the resistance of the guide vane on the air inlet is small, secondly, the distance between the guide ring and the fan is small, and the wind direction cannot be greatly changed before the wind passing through the guide ring enters the fan.
The fixed shaft 7 is internally provided with a plurality of lugs 22, the inner side of the fixed shaft is provided with an anti-slip layer 16, and the part of the motor shaft close to the motor is provided with a groove matched with the fixed shaft box, so that the fixed shaft and the motor shaft are axially and rotatably fixed to avoid deviation.
The base 11 and the volute 1 are integrally formed, so that noise generated by mechanical vibration is reduced.
The outlet side of the volute 1 is provided with the sound absorption material 17 which is made of polyurethane, the volute tongue reduces the impact force of wind on the volute tongue and reduces noise, but the noise caused by the flow between the impeller air outlet and the volute casing wall is slightly increased, and the noise generated by the section is reduced by adopting the sound absorption material.
The front side surface of the volute 1 is provided with a concave ring groove 18, the front cover plate 12 is provided with a convex connecting block 19 matched with the concave ring groove, the convex connecting block 19 and the front cover plate 11 are integrally formed, the concave ring groove 18 is provided with a plurality of groove connecting holes 20, the convex connecting block is provided with a block connecting hole 21 matched with the groove connecting holes, the sealing performance of the joint of the front cover plate and the volute is improved, and the sealing performance of the joint generated by micro deformation of the front cover plate in long-time operation is prevented from being reduced.
The basic principles, main features and advantages of the present invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The utility model provides an improvement type is spiral case for centrifugal fan, includes the spiral case, its characterized in that: the volute is provided with a volute tongue, the volute tongue comprises an upper volute tongue and a lower volute tongue, an outward protruding volute tongue is arranged between the upper volute tongue and the lower volute tongue, the volute tongue is positioned on one side of the front end of the volute and is lower than the volute tongue on one side of the rear end of the volute, the rear side of the volute is provided with a rear cover plate, the rear cover plate and the volute are integrally formed, the rear cover plate is provided with a shaft hole, the inner side of the shaft hole is provided with a fixed shaft, the fixed shaft is connected with the shaft hole through a bearing, the outer side of the rear cover plate is provided with a motor, a motor shaft of the motor is positioned in the fixed shaft, the motor is positioned in a motor base, the inner side of the motor base is provided with a damping layer, the bottom of the motor base is fixedly connected with the bottom of the volute, the front side of the volute, the air inlet central line, the center of the guide ring and the central axis of the fixed shaft are collinear, the guide ring is provided with guide vanes which are uniformly distributed on the inner side of the guide ring, the guide vanes are inclined guide vanes, and the outer side of the guide ring and the outer side of the guide vanes are both provided with rubber outer layers.
2. The improved volute for centrifugal blower as claimed in claim 1, wherein: the air inlet is an arc-shaped air inlet, and the flow guide ring is positioned at the position where the cross-sectional area of the arc-shaped air inlet is the minimum.
3. The improved volute for centrifugal blower as claimed in claim 1, wherein: the motor shaft is provided with a groove matched with the fixed shaft box, and the part, close to the motor, of the motor shaft is provided with a plurality of lugs.
4. The improved volute for centrifugal blower as claimed in claim 1, wherein: the base and the volute are integrally formed.
5. The improved volute for centrifugal blower as claimed in claim 1, wherein: and a sound absorption material is arranged on the outlet side of the volute.
6. The improved volute for centrifugal blower as claimed in claim 1, wherein: the spiral case leading flank is equipped with the spill annular, be equipped with on the front shroud with the spill annular matches the protruding connecting block that suits, protruding connecting block with front shroud integrated into one piece, be equipped with a plurality of groove connecting holes on the spill annular, protruding connecting block be equipped with the groove connecting hole matches the piece connecting hole that suits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920829873.1U CN210178651U (en) | 2019-06-04 | 2019-06-04 | Improvement type is spiral case for centrifugal fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920829873.1U CN210178651U (en) | 2019-06-04 | 2019-06-04 | Improvement type is spiral case for centrifugal fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210178651U true CN210178651U (en) | 2020-03-24 |
Family
ID=69836325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920829873.1U Expired - Fee Related CN210178651U (en) | 2019-06-04 | 2019-06-04 | Improvement type is spiral case for centrifugal fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210178651U (en) |
-
2019
- 2019-06-04 CN CN201920829873.1U patent/CN210178651U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200324 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |