CN109058166B - Enclosed fan shell - Google Patents
Enclosed fan shell Download PDFInfo
- Publication number
- CN109058166B CN109058166B CN201810724082.2A CN201810724082A CN109058166B CN 109058166 B CN109058166 B CN 109058166B CN 201810724082 A CN201810724082 A CN 201810724082A CN 109058166 B CN109058166 B CN 109058166B
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- plane
- cambered surface
- cambered
- ellipse
- shell
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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
- F04D29/403—Casings; Connections of working fluid especially adapted for elastic fluid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides a closed fan shell, which is a sealing structure consisting of a surrounding surface and two end surfaces, wherein the two end surfaces are parallel to each other, and the projections of the surrounding surface on the end surfaces are both closed structures; the surrounding surface consists of a top surface, a bottom surface, a first cambered surface and a second cambered surface, and the projections of the top surface, the bottom surface, the first cambered surface and the second cambered surface on the end surface are all linear structures; the first cambered surface and the second cambered surface are of symmetrical structures and are symmetrically arranged with the concave surfaces opposite to each other, the top of the bottom surface is connected with the bottoms of the first cambered surface and the second cambered surface, and the bottom of the top surface is connected with the tops of the first cambered surface and the second cambered surface. The closed fan shell provided by the invention is actually a structure which is coated on the periphery of the rotating track of the impeller and is partially overlapped with the rotating track of the impeller. Therefore, the air-closing performance of the air-closing machine is ensured, the friction stroke between the fan blades and the shell is reduced, and the friction damage between the fan blades and the shell is reduced; and reduces the friction between the fan blades and the shell, thereby reducing the friction loss.
Description
Technical Field
The invention relates to the technical field of closed fans, in particular to a closed fan shell.
Background
The closed fan consists of a shell and an impeller arranged in the shell, wherein the impeller consists of a rotating shaft and fan blades which are arranged on the rotating shaft and rotate along with the rotating shaft. The fan-shaped space that equals with flabellum quantity is cut apart into along pivot circumference to flabellum cooperation pivot with the casing inside, and feed inlet and discharge gate on the casing are located the fan-shaped space of difference, and all keep apart by the flabellum under feed inlet place fan-shaped space and the fan-shaped space optional state in discharge gate place to guarantee the isolation of feed inlet and discharge gate.
The closed fan appearing in the market at present has a structure that a shell is provided with a cylinder, and in the rotating process of an impeller, the rotating track of each fan blade is also a cylindrical surface and is superposed with the inner surface of the cylinder where the closed fan shell is positioned. So, though guaranteed the wind effect of closing the fan, nevertheless, the impeller rotates the in-process, and the flabellum rubs with shells inner wall always, has improved the flabellum degree of wear greatly, is unfavorable for the life who closes the fan.
Disclosure of Invention
Based on the technical problems in the prior art, the invention provides a closed fan shell.
The invention provides a closed fan shell, which is a sealing structure consisting of a surrounding surface and two end surfaces, wherein the two end surfaces are parallel to each other, and the projections of the surrounding surface on the end surfaces are both closed structures;
the surrounding surface consists of a top surface, a bottom surface, a first cambered surface and a second cambered surface, and the projections of the top surface, the bottom surface, the first cambered surface and the second cambered surface on the end surface are all linear structures; the first cambered surface and the second cambered surface are of symmetrical structures, the concave surfaces are oppositely and symmetrically arranged, the top of the bottom surface is connected with the bottoms of the first cambered surface and the second cambered surface, and the bottom of the top surface is connected with the tops of the first cambered surface and the second cambered surface; the top surface and the bottom surface are respectively provided with a feed inlet and a discharge outlet;
first cambered surface and second cambered surface projection on the terminal surface are located same ellipse A and about ellipse A's major axis symmetry, first cambered surface and second cambered surface projection on the terminal surface are the symmetrical structure about ellipse A's minor axis respectively, ellipse A's minor axis length is 2 ×L 0, ellipse A goes up the radius length through first cambered surface side and is L1, the distance nearest with ellipse A central point is L2 on the top surface, the distance nearest with ellipse A central point is L3 on the bottom surface, L1 > L0, L2 ≧ L1, L3 ≧ L1.
Preferably, the top surface consists of a first plane, a second plane and a third plane, the bottoms of the first plane and the second plane are respectively connected with the tops of the first cambered surface and the second cambered surface and are respectively tangent with the first cambered surface and the second cambered surface, the third plane is horizontally arranged, the two sides of the third plane are respectively connected with the tops of the first plane and the second plane, and the feed inlet is arranged on the third plane.
Preferably, the bottom surface consists of a fourth plane, a fifth plane and a sixth plane, the tops of the fourth plane and the fifth plane are respectively connected with the bottoms of the first cambered surface and the second cambered surface and are respectively tangent with the first cambered surface and the second cambered surface, the sixth plane is horizontally arranged, the two sides of the sixth plane are respectively connected with the bottoms of the fourth plane and the fifth plane, and the discharge hole is formed in the sixth plane.
Preferably, the projection of the top and/or bottom surface on the end face lies on a circle B with a radius equal to L1.
Preferably, the projection of the top and/or bottom surface onto the end face lies on the ellipse a.
Preferably, the projection of the top surface, the bottom surface, the first arc surface and the second arc surface on the end surface forms a complete ellipse a.
Preferably, the top surface and the bottom surface both smoothly transition with the first cambered surface and the second cambered surface.
Preferably, the central angle of the first arc surface and the second arc surface is greater than or equal to 60 degrees and less than or equal to 120 degrees.
The closed fan shell provided by the invention is actually a structure which is coated on the periphery of the rotating track of the impeller and is partially overlapped with the rotating track of the impeller. Therefore, in the rotation process of the impeller arranged in the shell, three stages are realized between the rotation process of the fan blades and the inner wall of the shell, and in the first stage, the fan blades tightly lean against the shell, so that the air-closing performance of the air-closing machine is ensured; in the second stage, the friction force between the fan blades and the shell is gradually reduced; in the third stage, a gap is reserved between the fan blade and the shell. In the rotation process of the impeller, the fan blades on the impeller are distributed in three stages, and each fan blade circulates in the three stages along with the rotation of the impeller, so that the air-closing performance of the air-closing fan is ensured, the friction stroke between the fan blades and the shell is reduced, and the friction damage between the fan blades and the shell is reduced; and reduces the friction between the fan blades and the shell, thereby reducing the friction loss.
Drawings
FIG. 1 is a view showing a structure of a casing in example 1;
fig. 2 is a structural view of a housing in embodiment 2.
Detailed Description
Referring to fig. 1, the closed fan casing provided by the invention is a sealing structure consisting of a surrounding surface and two end surfaces, wherein the two end surfaces are parallel to each other, and the projections of the surrounding surface on the end surfaces are both closed structures.
The enclosing surface comprises top surface 1, bottom surface 2, first cambered surface 3 and second cambered surface 4, and the projection of top surface 1, bottom surface 2, first cambered surface 3 and second cambered surface 4 on the terminal surface is linear structure. First cambered surface 3 and second cambered surface 4 are symmetrical structure and the relative symmetry setting of concave surface, and the top of bottom surface 2 is connected with the bottom of first cambered surface 3 and second cambered surface 4, and the bottom of top surface 1 is connected with the top of first cambered surface 3 and second cambered surface 4. The top surface 1 and the bottom surface 2 are respectively provided with a feed inlet and a discharge outlet.
First cambered surface 3 and second cambered surface 4 are located same ellipse A and about ellipse A's major axis symmetry on the projection of terminal surface, first cambered surface 3 and second cambered surface 4 are the symmetrical structure about ellipse A's minor axis respectively at the projection on the terminal surface ellipse A's minor axis length is 2 ×L 0, ellipse A goes up the radius length through first cambered surface 3 side and is L1, the distance nearest with ellipse A central point is L2 on the top surface 1, the distance nearest with ellipse A central point is L3 on bottom surface 2, L1 > L0, L2 ≧ L1, L3 ≧ L1.
When the impeller is arranged in the closed fan shell provided by the embodiment and works, the cylindrical surface of the impeller where the rotating track of the fan blades is located is positioned in the shell. Combine prior art, flabellum top installation film, so, when the flabellum rotated oval A's minor axis position, the friction was the biggest between film and the shells inner wall, the process of rotating first cambered surface 3 and top surface or bottom surface juncture by oval A's minor axis position is the process that frictional force reduces between film and the shells inner wall, through the length that sets up the flabellum, when the flabellum passes through top surface 1 and bottom surface 2, can avoid flabellum and top surface and bottom surface 2 contacts, thereby reduce the frictional distance of flabellum and shells inner wall, thereby reduce the friction damage. Simultaneously, among this embodiment, top surface 1, bottom surface 2 all with first cambered surface 3 and second cambered surface 4 smooth transition, so, the flabellum is turning to the in-process of first cambered surface 3 or second cambered surface 4 from top surface or bottom surface 2, can avoid the flabellum to rotate and be obstructed, guarantees the steady rotation of the inside impeller of casing to guarantee the continuous stability of impeller transportation material.
In the first stage, the fan blades tightly lean against the shell, so that the air-closing performance of the air-closing machine is ensured; in the second stage, the friction force between the fan blades and the shell is gradually reduced; in the third stage, a gap is reserved between the fan blade and the shell. In the rotation process of the impeller, the fan blades on the impeller are distributed in three stages, and each fan blade circulates in the three stages along with the rotation of the impeller, so that the air-closing performance of the air-closing fan is ensured, the friction stroke between the fan blades and the shell is reduced, and the friction damage between the fan blades and the shell is reduced; and reduces the friction between the fan blades and the shell, thereby reducing the friction loss.
In the present embodiment, the top surface 1 and the bottom surface 2 both smoothly transition with the first arc surface 3 and the second arc surface 4. And the central angle corresponding to the first cambered surface 3 and the second cambered surface 4 is greater than or equal to 60 degrees and less than or equal to 120 degrees, so that the flexibility of fan blade arrangement is ensured.
Example 1
In this embodiment, the top surface 1 is composed of a first plane 1-1, a second plane 1-2 and a third plane 1-3, bottoms of the first plane 1-1 and the second plane 1-2 are respectively connected with tops of a first arc surface 3 and a second arc surface 4 and are respectively tangent with the first arc surface 3 and the second arc surface 4, the third plane 1-3 is horizontally arranged, two sides of the third plane are respectively connected with tops of the first plane 1-1 and the second plane 1-2, and the feed inlet is arranged on the third plane.
The bottom surface 2 consists of a fourth plane 2-1, a fifth plane 2-2 and a sixth plane 2-3, the tops of the fourth plane 2-1 and the fifth plane 2-2 are respectively connected with the bottoms of the first cambered surface 3 and the second cambered surface 4 and are respectively tangent with the first cambered surface 3 and the second cambered surface 4, the sixth plane 2-3 is horizontally arranged, the two sides of the sixth plane are respectively connected with the bottoms of the fourth plane 2-1 and the fifth plane 2-2, and a discharge hole is formed in the sixth plane 2-3.
In this embodiment, the first plane 1-1, the second plane 1-2, the fourth plane 2-1 and the fifth plane 2-2 lay a foundation for smooth transition of three stages in the rotation process of the fan blades, and the third plane 1-3 and the sixth plane 2-3 are horizontally arranged, so that the arrangement of the feeding port and the discharging port is facilitated.
Example 2
In this embodiment, the projection of the top surface 1 and/or the bottom surface 2 on the end surface is located on the circle B with the radius equal to L1, which is beneficial to reduce the volume of the whole shell.
Example 3
In the present exemplary embodiment, the projection of the top side 1 and/or the bottom side 2 onto the end face lies on the ellipse a. Further, the projections of the top surface 1, the bottom surface 2, the first arc surface 3 and the second arc surface 4 on the end surfaces form a complete ellipse a. Therefore, the whole shell forms an oval column structure, and is convenient to machine and form.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (8)
1. A kind of closed fan shell, this shell is the hermetically-sealed construction composed of surrounding surface and two terminal surfaces, two terminal surfaces are parallel to each other, characterized by that, the projection on terminal surface of the surrounding surface is a closed structure;
the surrounding surface consists of a top surface (1), a bottom surface (2), a first cambered surface (3) and a second cambered surface (4), and the projections of the top surface (1), the bottom surface (2), the first cambered surface (3) and the second cambered surface (4) on the end surfaces are all linear structures; the first cambered surface (3) and the second cambered surface (4) are of symmetrical structures, the concave surfaces of the first cambered surface and the second cambered surface are oppositely and symmetrically arranged, the top of the bottom surface (2) is connected with the bottoms of the first cambered surface (3) and the second cambered surface (4), and the bottom of the top surface (1) is connected with the tops of the first cambered surface (3) and the second cambered surface (4); the top surface (1) and the bottom surface (2) are respectively provided with a feed inlet and a discharge outlet;
first cambered surface (3) and second cambered surface (4) projection on the terminal surface are located same ellipse A and about ellipse A's major axis symmetry, first cambered surface (3) and second cambered surface (4) are respectively for the symmetrical structure about ellipse A's minor axis at the projection on the terminal surface, ellipse A's minor axis length is 2 ×L 0, the radius length through first cambered surface (3) side on ellipse A is L1, the distance nearest with ellipse A central point on top surface (1) is L2, the distance nearest with ellipse A central point on bottom surface (2) is L3, L1 > L0, L2 ≧ L1, L3 ≧ L1.
2. The air-entrapping fan housing as claimed in claim 1, wherein the top surface (1) is composed of a first plane (1-1), a second plane (1-2) and a third plane (1-3), the bottoms of the first plane (1-1) and the second plane (1-2) are respectively connected with the tops of the first cambered surface (3) and the second cambered surface (4) and are respectively tangent to the first cambered surface (3) and the second cambered surface (4), the third plane (1-3) is horizontally arranged, the two sides of the third plane are respectively connected with the tops of the first plane (1-1) and the second plane (1-2), and the feed inlet is arranged on the third plane.
3. The air-entrapping fan housing as claimed in claim 1, wherein the bottom surface (2) is composed of a fourth plane (2-1), a fifth plane (2-2) and a sixth plane (2-3), the tops of the fourth plane (2-1) and the fifth plane (2-2) are respectively connected with the bottoms of the first cambered surface (3) and the second cambered surface (4) and respectively tangent to the first cambered surface (3) and the second cambered surface (4), the sixth plane (2-3) is horizontally arranged, the two sides of the sixth plane are respectively connected with the bottoms of the fourth plane (2-1) and the fifth plane (2-2), and the discharge port is arranged on the sixth plane (2-3).
4. An enclosed fan casing according to claim 1, characterized in that the projection of the top side (1) and/or the bottom side (2) onto the end face lies on a circle B with a radius equal to L1.
5. An enclosed fan casing according to claim 1, characterized in that the projection of the top side (1) and/or the bottom side (2) onto the end face lies on the ellipse a.
6. An air-trap housing as claimed in claim 5, characterized in that the projections of the top surface (1), the bottom surface (2), the first arc surface (3) and the second arc surface (4) onto the end faces form a complete ellipse A.
7. An air-trap housing as claimed in any of claims 1 to 6, characterized in that both the top surface (1) and the bottom surface (2) have a smooth transition to the first arc-shaped surface (3) and the second arc-shaped surface (4).
8. The air-entrapping fan housing of claim 7, wherein the first arc surface (3) and the second arc surface (4) have a corresponding central angle of greater than or equal to 60 degrees and less than or equal to 120 degrees.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201810724082.2A CN109058166B (en) | 2018-07-04 | 2018-07-04 | Enclosed fan shell |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CN201810724082.2A CN109058166B (en) | 2018-07-04 | 2018-07-04 | Enclosed fan shell |
Publications (2)
Publication Number | Publication Date |
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CN109058166A CN109058166A (en) | 2018-12-21 |
CN109058166B true CN109058166B (en) | 2020-07-24 |
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ID=64818731
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Application Number | Title | Priority Date | Filing Date |
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CN201810724082.2A Active CN109058166B (en) | 2018-07-04 | 2018-07-04 | Enclosed fan shell |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2362152A1 (en) * | 1973-12-14 | 1975-06-26 | Andreas Jaudt | Discharge rotary wheel for conveying bulk materials - has adjoining blades forming pockets emptied of contents with pressurised gas |
CN1453491A (en) * | 2002-04-24 | 2003-11-05 | 乔甫拉克斯株式会社 | Fluid changing-over device |
CN2670639Y (en) * | 2003-06-13 | 2005-01-12 | 李永根 | Sealed air machniery |
CN202245348U (en) * | 2011-06-18 | 2012-05-30 | 李从宾 | Anti-blocking air lock |
CN108058997A (en) * | 2017-12-08 | 2018-05-22 | 新乡学院 | A kind of block-proof type ultrasound airlock |
-
2018
- 2018-07-04 CN CN201810724082.2A patent/CN109058166B/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2362152A1 (en) * | 1973-12-14 | 1975-06-26 | Andreas Jaudt | Discharge rotary wheel for conveying bulk materials - has adjoining blades forming pockets emptied of contents with pressurised gas |
CN1453491A (en) * | 2002-04-24 | 2003-11-05 | 乔甫拉克斯株式会社 | Fluid changing-over device |
CN2670639Y (en) * | 2003-06-13 | 2005-01-12 | 李永根 | Sealed air machniery |
CN202245348U (en) * | 2011-06-18 | 2012-05-30 | 李从宾 | Anti-blocking air lock |
CN108058997A (en) * | 2017-12-08 | 2018-05-22 | 新乡学院 | A kind of block-proof type ultrasound airlock |
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Publication number | Publication date |
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CN109058166A (en) | 2018-12-21 |
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