CN216241500U - Flow guiding air inlet ring and centrifugal fan - Google Patents
Flow guiding air inlet ring and centrifugal fan Download PDFInfo
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- CN216241500U CN216241500U CN202122783983.9U CN202122783983U CN216241500U CN 216241500 U CN216241500 U CN 216241500U CN 202122783983 U CN202122783983 U CN 202122783983U CN 216241500 U CN216241500 U CN 216241500U
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Abstract
The application relates to the field of kitchen equipment, in particular to a guide air inlet ring and a centrifugal fan. The guide air inlet ring is provided with a plurality of guide structures so as to guide airflow from the outer side of the guide air inlet ring to the air inlet of the centrifugal fan at the inner side of the guide air inlet ring; the plurality of flow guide structures are rotationally symmetrical along the circle center of the flow guide air inlet ring, the flow guide structures form an arc-shaped flow guide path to deflect air flow, so that the air flow passing through the plurality of flow guide paths moves in a preset movement direction, and the preset movement direction has a tangential movement component consistent with the rotation direction of an impeller of the centrifugal fan. The application provides a water conservancy diversion air inlet circle can produce and rotate the inlet flow to the inside motion of fan, has the motion trend that is close impeller direction of rotation when the air current gets into the blade runner, has less tangential velocity difference for the blade to weaken blade runner air separation, optimize the runner air current and flow, solve fan air intake air current inhomogeneous and cause the smoking effect not good and the vortex impulsive noise is showing scheduling problem.
Description
Technical Field
The application relates to the field of kitchen equipment, in particular to a guide air inlet ring and a centrifugal fan.
Background
The multi-wing centrifugal fan is used as a core component of the range hood, and plays a decisive role in the smoke absorption effect. Influenced by cigarette machine structure and centrifugal fan air inlet mode, the flow uniformity of fan air intake air current is relatively poor, and inhomogeneous air current leads to the blade runner to take place serious air current separation phenomenon, and the effective flow area of air current reduces, and fan efficiency reduces, and wind channel vortex impact noise is showing. The problem of uneven air flow of the air inlet seriously influences the smoking effect and the user experience of the cigarette making machine and easily pollutes the air environment of a kitchen.
SUMMERY OF THE UTILITY MODEL
An object of this application is to provide a flow guiding air inlet ring and centrifugal fan to the air current direction to the centrifugal fan air intake.
The application provides a guide air inlet ring which is used for a centrifugal fan, wherein a plurality of guide structures are formed on the guide air inlet ring so as to guide airflow from the outer side of the guide air inlet ring to an air inlet of the centrifugal fan on the inner side of the guide air inlet ring;
the plurality of flow guide structures are rotationally symmetrical along the circle center of the flow guide air inlet ring, the flow guide structures form an arc-shaped flow guide path to deflect air flow, so that the air flow passing through the plurality of flow guide paths moves in a preset movement direction, and the preset movement direction has a tangential movement component consistent with the rotation direction of an impeller of the centrifugal fan.
In the above technical solution, further, a flow guide portion is included;
the flow guide part is annular, and an inner ring opening of the flow guide part is arranged corresponding to an air inlet of the centrifugal fan; a wind guide surface is formed on one side of the flow guide part, which is far away from the centrifugal fan, the cross section of the flow guide part is cut along the radial direction of the flow guide part, and the contour line of the wind guide surface of the cross section is an arc line section with a middle part protruding towards one side, which is far away from the centrifugal fan;
the flow guide structure is a flow guide groove formed in the flow guide part, and the flow guide groove extends from the outer ring of the flow guide part to the inner ring of the flow guide part along the length direction of the flow guide groove.
In the above technical solution, further, a center line of the diversion trench in the length direction is a preset arc line;
the end point of the preset arc line close to the inner ring of the flow guide part is a first end point, and the end point of the other end of the preset arc line is a second end point; the circle center is the circle center of the flow guide part, and an included angle formed by a tangent line of a circle passing through the first endpoint and a connecting line connecting the first endpoint and the second endpoint is 15-20 degrees.
In the above technical solution, further, a central angle of the preset circular arc line is between 30 ° and 90 °.
In the above technical solution, further, along the width direction of the diversion trench, the bottom profile of the diversion trench is arc-shaped;
and at the convex top of the air guide surface of the air guide part, the depth of the guide groove is half of the height of the convex air guide surface.
In the above technical solution, further, from the direction from the outer ring to the inner ring of the guide part, the width of the notch profile of the guide groove has a tendency of gradually expanding and then gradually contracting, and the contraction degree of the end of the notch profile of the guide groove close to the outer ring of the guide part is smaller than the contraction degree of the end of the notch profile of the guide groove close to the inner ring of the guide part.
In the above technical solution, further, the widths of the notch profiles of the guide grooves are uniform in a direction from the outer ring to the inner ring of the guide part;
and the two end parts of the notch profile of the diversion trench are in arc transition.
In the above technical scheme, further, the flow guide air inlet ring further includes a connecting portion, the connecting portion is located in the circumferential direction of the flow guide portion, and the connecting portion is used for connecting the centrifugal fan.
In the above technical scheme, further, the flow guide air inlet ring is formed by bending the plate into the flow guide part and the connecting part, and the flow guide part is pressed to form the flow guide groove.
The application also provides a centrifugal fan, which comprises the above scheme.
Compared with the prior art, the beneficial effect of this application is:
the application provides a water conservancy diversion air inlet circle is used for centrifugal fan, especially multi-wing formula centrifugal fan. The guide air inlet ring is provided with a plurality of guide structures so as to guide air flow from the outer side of the guide air inlet ring to the air inlet of the centrifugal fan on the inner side of the guide air inlet ring. The whole structure does not occupy the air inlet area, can not obstruct the air inlet flow, and reduces the dissipation of the air flow energy.
The plurality of flow guide structures are rotationally symmetrical along the circle center of the flow guide air inlet ring, the flow guide structures form an arc-shaped flow guide path to deflect air flow, so that the air flow passing through the plurality of flow guide paths moves in a preset movement direction, and the preset movement direction has a tangential movement component consistent with the rotation direction of an impeller of the centrifugal fan.
Particularly, the air current of air inlet circle department assembles to air inlet department from the circumference department of air inlet circle, and a plurality of water conservancy diversion structures are along the centre of a circle rotational symmetry of water conservancy diversion air inlet circle to can lead to circumference air current everywhere, in order to guarantee the homogeneity that the air intake everywhere.
Furthermore, the flow guide structure forms an arc-shaped flow guide path to deflect airflow so as to generate tangential motion in the same direction as the linear speed of the impeller, and generates air inlet flow which rotates and moves towards the inside of the fan under the combined action of the traction force of the inlet of the fan; the airflow has a certain tangential speed, so that the airflow has a movement trend close to the rotation direction of the impeller when entering the blade flow channel, and has a smaller tangential speed difference relative to the blade, thereby weakening the airflow separation of the blade flow channel, optimizing the airflow flowing of the flow channel, and solving the problems of poor smoking effect, obvious vortex impact noise and the like caused by uneven airflow at the air inlet of the fan.
The application also provides a centrifugal fan, which comprises the scheme. Based on the above analysis, the centrifugal fan has the above beneficial effects, and is not described herein again.
Drawings
In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic view of an assembly structure of a flow guiding air inlet ring provided in the present application;
FIG. 2 is a schematic structural view of a flow guiding air inlet ring provided in the present application;
FIG. 3 is an enlarged schematic view at A in FIG. 2;
FIG. 4 is a schematic cross-sectional view of a flow directing air inlet ring provided herein;
fig. 5 is a schematic view of a first structure of a flow guide groove provided in the present application;
fig. 6 is a second structural schematic diagram of a flow guide groove provided in the present application;
fig. 7 is a schematic view of a third structure of a flow guide groove provided in the present application.
In the figure: 101-a centrifugal fan; 102-an impeller; 103-a flow guide part; 104-a connecting portion; 105-an air guide surface; 106-connecting hole; 107-diversion trenches; 108-presetting arc lines; 109-a first endpoint; 110-second endpoint.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Example one
Aiming at the technical problems in the prior art, the following analysis is made in the application:
1. the fan admits air unevenly, and the smoking effect is not good: the inside fan subassembly of cigarette machine is because the restriction of spiral case structure, and the diffuser section below the air outlet in the main acting region of impeller, and this region flows unobstructed, and the air current is intensive, and the diffuser section of volute tongue rear side is the main backward flow region of impeller, and this region air current is disorderly, and above each factor leads to fan air intake air current to flow inhomogeneous to it is inhomogeneous to lead to the cigarette machine to advance the cigarette mouth.
2. The flow channel separation is severe, and the noise is obvious: under the condition that the airflow at the air inlet of the range hood is not interfered, the airflow in the blade flow channel has a larger attack angle relative to the blades, strong separation is generated, vortex impact noise in the flow channel is enhanced, the effective flow area of the flow channel is small, and the efficiency of the fan and the smoking effect are reduced.
Based on above-mentioned analysis content, this application has improved the air inlet circle that sets up in centrifugal fan's air intake department to carry out the guide of prewhirling to the air current that gets into the air intake.
The application provides a water conservancy diversion air inlet circle is used for centrifugal fan, especially multi-wing formula centrifugal fan. Referring to fig. 1 to 7, the guide air inlet ring is formed with a plurality of guide structures to guide the air flow from the outside of the guide air inlet ring to the air inlet of the centrifugal fan 101 at the inside of the guide air inlet ring. The whole structure does not occupy the air inlet area, can not obstruct the air inlet flow, and reduces the dissipation of the air flow energy.
The plurality of guide structures are rotationally symmetric along the center of the guide air inlet ring, the guide structures form an arc-shaped guide path to deflect the air flow, so that the air flow passing through the plurality of guide paths moves in a preset movement direction having a component of tangential movement that is consistent with the rotation direction (direction B shown in fig. 2, clockwise direction) of the impeller 102 of the centrifugal fan 101, and the arrow in fig. 1 shows the flow direction of the guided air flow.
Particularly, the air current of water conservancy diversion air inlet circle department assembles to air inlet department from circumference department, and a plurality of water conservancy diversion structures are along the centre of a circle rotational symmetry of water conservancy diversion air inlet circle to can lead to circumference air current everywhere, in order to guarantee the homogeneity that the air intake everywhere.
Furthermore, the flow guide structure forms an arc-shaped flow guide path to deflect airflow so as to generate tangential motion in the same direction as the linear speed of the impeller 102, and generates air inflow which rotates and moves towards the inside of the fan under the combined action of the traction force of the inlet of the fan, and the airflow is prerotated in the mode, so that the uniformity of airflow at the air inlet is improved, the flow area of the air inlet is increased, and the airflow can more easily enter the impeller 102; the airflow has a certain tangential speed, so that the airflow has a movement trend close to the rotation direction of the impeller 102 when entering the blade flow passage, and has a smaller tangential speed difference relative to the blade, thereby weakening the airflow separation of the blade flow passage, optimizing the airflow flowing of the flow passage, and solving the problems of poor smoking effect, obvious vortex impact noise and the like caused by uneven airflow at the air inlet of the fan.
Referring specifically to fig. 2 to 4, in an alternative embodiment of the present invention, the diversion air inlet ring includes a diversion portion 103 and a connection portion 104.
The flow guide part 103 is annular, and an inner ring opening of the flow guide part 103 is arranged corresponding to an air inlet of the centrifugal fan 101; one side of the flow guide part 103 far away from the centrifugal fan 101 is formed with an air guide surface 105, the cross section of the flow guide part 103 is cut along the radial direction of the flow guide part 103, and the contour line of the air guide surface 105 of the cross section is a circular arc line segment which is convex towards one side far away from the centrifugal fan 101 in the middle. The connecting portion 104 is located in the circumferential direction of the flow guide portion 103, and the connecting portion 104 is used for connecting the centrifugal fan 101. The arc-shaped air guide surface 105 can smoothly guide the air flow to the impeller 102, so that the performance of the fan can be effectively improved, and the noise value is relatively low under the condition of large fan flow.
The connecting portion 104 is located in the circumferential direction of the flow guide portion 103, and the connecting portion 104 is used for connecting the centrifugal fan 101. The connecting portion 104 shown in the figure is also configured to be annular, and the connecting portion 104 is provided with a plurality of connecting holes 106 uniformly distributed, so that the diversion air inlet ring can be installed at the air inlet of the centrifugal fan 101 through bolts. Alternatively, the connection portion 104 may be a plurality of connection points arranged at intervals, and a connection hole 106 is opened at each connection point to connect the centrifugal fan 101. Of course, compared with the structure that the guide air inlet ring is provided with a plurality of connection points, the guide air inlet ring is provided with the annular connection part 104, and the overall structural strength is higher.
The specific form of the flow guiding structure is a flow guiding groove 107 formed in the flow guiding part 103, and along the length direction of the flow guiding groove 107, the flow guiding groove 107 sequentially extends from the outer ring of the flow guiding part 103, through the highest point of the flow guiding part 103, and finally to the inner ring of the flow guiding part 103, and by utilizing the adhesion flow effect of fluid, when airflow flows to the arc-shaped protruding flow guiding part 103, at least a part of the airflow can flow into the flow guiding groove 107, and under the guiding effect of the flow guiding groove 107, the airflow can deflect in the same direction as the rotation direction of the impeller 102. The airflow can generate a reverse thrust effect on the air inlet flow of the centrifugal fan 101, the trend of reverse relative motion of the air inlet flow and the impeller 102 is weakened, the flow separation of a flow passage of the impeller 102 can be effectively reduced, the effective acting area is increased, the performance of the centrifugal fan 101 is improved, and the smoking effect of the range hood is further improved.
Furthermore, the diversion air inlet ring is formed by bending the plate to form a diversion part 103 and a connecting part 104, the diversion part 103 is pressed to form a diversion trench 107, and the diversion air inlet ring is lighter in weight.
In an alternative scheme of this embodiment, referring to fig. 2 and 3, a central line of the diversion trench 107 in the length direction is a preset arc line 108; an end point of the preset arc line 108 close to the inner ring of the flow guide part 103 is a first end point 109, and an end point of the other end of the preset arc line 108 is a second end point 110; an angle (angle C shown in fig. 2 and 3) between a tangent to the first end point 109 and a connecting line connecting the first end point 109 and the second end point 110, of a circle having a center at the flow guide 103 and passing through the first end point 109, is between 15 ° and 20 °.
This angle determines the degree of deflection of the guide groove 107 with respect to the impeller 102, and also determines the length of the guide groove 107 when the width of the guide part 103 is constant. It is verified that the diversion effect of the diversion trench 107 deflected within the above-mentioned angle range is better. If the angle is too large, the component of the tangential motion which is consistent with the rotation direction of the impeller 102 of the centrifugal fan 101 is small, and the deflection effect on the air flow is poor; if the angle is too small, the flow path of the air flow in the guiding groove 107 is too long, which easily causes dissipation of the air flow energy.
In an alternative of this embodiment, the central angle (the angle D shown in fig. 2 and 3) of the predetermined circular arc 108 is between 30 ° and 90 °, and preferably, the central angle of the predetermined circular arc 108 is 45 °, which is used to control the curvature of the diversion path formed by the diversion trench 107, so that the airflow can smoothly flow into the impeller 102 in the air inlet while forming the swirling flow.
In an optional scheme of this embodiment, along the width direction of the guiding gutter 107, the contour of the bottom of the guiding gutter 107 is arc-shaped, and the bottom structure of the bottom of the guiding gutter 107 is streamline-shaped, so that the generated resistance is relatively smaller. At the convex vertex of the air guide surface 105 of the air guide part 103, the depth of the air guide groove 107 is set to be half of the convex height of the air guide surface 105 at the maximum; the depth of the guide groove 107 gradually decreases from the apex of the projection of the air guide surface 105 toward the inner ring and the outer ring of the guide part 103, respectively.
Example two
The diversion air inlet ring in the second embodiment is an improvement on the basis of the second embodiment, technical contents disclosed in the second embodiment are not described repeatedly, and the contents disclosed in the second embodiment also belong to the contents disclosed in the second embodiment.
Referring to fig. 1 to 6, in an alternative of this embodiment, the width of the notch profile of the diversion trench 107 has a tendency of gradually expanding and then gradually contracting in a direction from the outer ring to the inner ring of the diversion part 103, and the contraction degree of one end of the notch profile of the diversion trench 107 close to the outer ring of the diversion part 103 is smaller than that of one end of the notch profile of the diversion trench 107 close to the inner ring of the diversion part 103, that is, the gradient of profile contraction is relatively small in a direction from the widest position of the notch profile of the diversion trench 107 to the outer ring of the diversion part 103; the slope of the profile contraction is relatively large from the widest point of the notch profile of the guide groove 107 to the direction of the inner ring of the guide part 103.
In this embodiment, in particular, two notch profile configurations of channels 107 are shown in fig. 5 and 6, respectively: fig. 5 shows a fish-shaped profile and fig. 6 shows a wing-shaped profile. The fish-shaped structure contour simulates the contour of the raw fish so as to reduce the resistance to the air flow. The wing-shaped structure comprises various wing-shaped structures in a curved form, the front edges of the wing-shaped structures are positioned in the inner direction of the flow guide part 103, and the wing-shaped structures also have smaller wind resistance.
In addition, referring to fig. 7, in an alternative of this embodiment, the width of the notch profile of the guide groove 107 is uniform from the outer ring of the guide part 103 to the inner ring; the two ends of the notch profile of the guide groove 107 are in circular arc transition. That is, the width of the head and the tail of the diversion trench 107 is not changed, and the contour of the head and the tail of the diversion trench 107 are both arc-shaped.
For the two structural forms, the notch profile of the guiding groove 107 is a smooth curve, which has the technical effects of facilitating the air flow and weakening the air flow resistance and impact.
EXAMPLE III
The third embodiment of the present application provides a centrifugal fan, including the air inlet ring of the aforementioned any embodiment, therefore, have all beneficial technical effects of the air inlet ring of the aforementioned any embodiment, and here, no longer give unnecessary details.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application. Moreover, those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments.
Claims (10)
1. A flow guide air inlet ring is used for a centrifugal fan and is characterized in that a plurality of flow guide structures are formed on the flow guide air inlet ring so as to guide airflow from the outer side of the flow guide air inlet ring to an air inlet of the centrifugal fan on the inner side of the flow guide air inlet ring;
the plurality of flow guide structures are rotationally symmetrical along the circle center of the flow guide air inlet ring, the flow guide structures form an arc-shaped flow guide path to deflect air flow, so that the air flow passing through the plurality of flow guide paths moves in a preset movement direction, and the preset movement direction has a tangential movement component consistent with the rotation direction of an impeller of the centrifugal fan.
2. The diversion air intake ring of claim 1, comprising a diversion portion;
the flow guide part is annular, and an inner ring opening of the flow guide part is arranged corresponding to an air inlet of the centrifugal fan; a wind guide surface is formed on one side of the flow guide part, which is far away from the centrifugal fan, the cross section of the flow guide part is cut along the radial direction of the flow guide part, and the contour line of the wind guide surface of the cross section is an arc line section with a middle part protruding towards one side, which is far away from the centrifugal fan;
the flow guide structure is a flow guide groove formed in the flow guide part, and the flow guide groove extends from the outer ring of the flow guide part to the inner ring of the flow guide part along the length direction of the flow guide groove.
3. The diversion air intake ring of claim 2, wherein a center line in a length direction of the diversion trench is a preset circular arc line;
the end point of the preset arc line close to the inner ring of the flow guide part is a first end point, and the end point of the other end of the preset arc line is a second end point; the circle center is the circle center of the flow guide part, and an included angle formed by a tangent line of a circle passing through the first endpoint and a connecting line connecting the first endpoint and the second endpoint is 15-20 degrees.
4. The flow-guiding air intake ring of claim 3, wherein the predetermined circular arc line has a central angle between 30 ° and 90 °.
5. The diversion air intake ring of claim 2, wherein the profile of the bottom of the diversion trench is arc-shaped along the width direction of the diversion trench;
and at the convex top of the air guide surface of the air guide part, the depth of the guide groove is half of the height of the convex air guide surface.
6. The diversion air intake ring of claim 2, wherein, from the outer ring to the inner ring of the diversion part, the width of the notch profile of the diversion trench has a tendency of gradually expanding and then gradually contracting, and the contraction degree of one end of the notch profile of the diversion trench close to the outer ring of the diversion part is smaller than that of one end of the notch profile of the diversion trench close to the inner ring of the diversion part.
7. The diversion air intake ring of claim 2, wherein the widths of the notch profiles of the diversion grooves are equal in a direction from the outer ring to the inner ring of the diversion part;
and the two end parts of the notch profile of the diversion trench are in arc transition.
8. The flow guide air inlet ring according to claim 2, further comprising a connecting portion located in the circumferential direction of the flow guide portion, wherein the connecting portion is used for connecting the centrifugal fan.
9. The flow guiding air inlet ring as claimed in claim 8, wherein the flow guiding portion and the connecting portion are formed by bending a plate, and the flow guiding portion is pressed to form the flow guiding groove.
10. A centrifugal fan comprising a flow guiding air inlet ring according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122783983.9U CN216241500U (en) | 2021-11-12 | 2021-11-12 | Flow guiding air inlet ring and centrifugal fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122783983.9U CN216241500U (en) | 2021-11-12 | 2021-11-12 | Flow guiding air inlet ring and centrifugal fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216241500U true CN216241500U (en) | 2022-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122783983.9U Active CN216241500U (en) | 2021-11-12 | 2021-11-12 | Flow guiding air inlet ring and centrifugal fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216241500U (en) |
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2021
- 2021-11-12 CN CN202122783983.9U patent/CN216241500U/en active Active
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