CN113915151A - Pipeline fan convenient to maintain and manage - Google Patents
Pipeline fan convenient to maintain and manage Download PDFInfo
- Publication number
- CN113915151A CN113915151A CN202111065037.9A CN202111065037A CN113915151A CN 113915151 A CN113915151 A CN 113915151A CN 202111065037 A CN202111065037 A CN 202111065037A CN 113915151 A CN113915151 A CN 113915151A
- Authority
- CN
- China
- Prior art keywords
- outer frame
- maintenance
- air duct
- guide cylinder
- top plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012423 maintenance Methods 0.000 claims abstract description 34
- 238000005452 bending Methods 0.000 claims abstract description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 17
- 230000005540 biological transmission Effects 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims 2
- 238000007493 shaping process Methods 0.000 claims 2
- 238000009423 ventilation Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
Images
Classifications
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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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- 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
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/522—Casings; Connections of working fluid for axial pumps especially adapted for elastic fluid pumps
-
- 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
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/541—Specially adapted for elastic fluid pumps
-
- 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
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/64—Mounting; Assembling; Disassembling of axial pumps
- F04D29/644—Mounting; Assembling; Disassembling of axial pumps especially adapted for elastic fluid pumps
- F04D29/646—Mounting or removal of fans
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a pipeline fan convenient for maintenance and management, which comprises a rectangular outer frame, wherein a rectangular maintenance groove hole which is opposite to an air duct is formed in the lower end surface of the outer frame; rectangular side plates are formed by bending two ends of the air guide cylinder, an Jiong-shaped cover plate is fixed between the side plates on the lower side of the air guide cylinder, and the lower ends of the cover plate and the side plates are inserted into a maintenance slotted hole of the outer frame; a horizontal top plate is fixedly inserted between the side plates at the lower side of the air guide cylinder, two ends of the top plate abut against the inner walls at two sides of the outer frame, a plurality of vertical first bolts are inserted in the upper end face of the outer frame, and the first bolts are screwed on the top plate; a plurality of vertical connecting plates are fixedly inserted between the side plates on the left side and the right side of the air duct, horizontal internal thread connecting columns are inserted in the connecting plates, a plurality of horizontal second bolts are inserted in the side walls on the two sides of the outer frame, and the second bolts are screwed in the internal thread connecting columns.
Description
Technical Field
The invention relates to the technical field of fans, in particular to a pipeline fan convenient to maintain and manage.
Background
The pipeline fan can provide medium wind pressure and medium wind quantity, and is commonly used in a ventilation system in a high-rise civil building. Some present pipeline fans are generally installed between the ventilation pipeline to fixed in ceiling department through the support, and pipeline fan has not avoided can breaking down, so need regular maintenance, the maintenance need with pipeline fan follow ventilation pipeline dismantle the back subaerial inspection repair, and follow ventilation pipeline's dismantlement pipeline fan comparatively troublesome, and install pipeline fan on ventilation pipeline also comparatively troublesome again, so indirect increase the degree of difficulty of maintenance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a pipeline fan convenient to maintain and manage.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a pipeline fan convenient for maintenance and management comprises a rectangular outer frame, wherein both ends of the outer frame are bent to form rectangular connecting frames, a plurality of mounting holes are formed in the connecting frames, an air guide cylinder is inserted in the outer frame, a fan assembly is arranged on the air guide cylinder, and a rectangular maintenance groove hole opposite to the air guide cylinder is formed in the lower end face of the outer frame; rectangular side plates are formed by bending two ends of the air guide cylinder, an Jiong-shaped cover plate is fixed between the side plates on the lower side of the air guide cylinder, and the lower ends of the cover plate and the side plates are inserted into a maintenance slotted hole of the outer frame; a horizontal top plate is fixedly inserted between the side plates at the lower side of the air guide cylinder, two ends of the top plate abut against the inner walls at two sides of the outer frame, a plurality of vertical first bolts are inserted in the upper end face of the outer frame, and the first bolts are screwed on the top plate; a plurality of vertical connecting plates are fixedly inserted between the side plates on the left side and the right side of the air duct, horizontal internal thread connecting columns are inserted in the connecting plates, one ends of the internal thread connecting columns abut against the inner wall of the outer frame, retaining rings are formed at the other ends of the internal thread connecting columns and abut against the connecting plates, a plurality of horizontal second bolts are inserted in the side walls on the two sides of the outer frame and are in threaded connection with the internal thread connecting columns.
Preferably, the upper end surface of the side plate of the air duct abuts against the inner wall of the upper side of the outer frame, and gaps are respectively arranged between the left side and the right side of the side plate and the inner walls of the left side and the right side of the outer frame; the side plate and the cover plate are both abutted against the inner side wall of the maintenance groove hole.
Preferably, the upper end face of the top plate is flush with the upper end face of the side plate, a plurality of nuts are welded and fixed on the lower end face of the top plate, and the first bolt is in threaded connection with the nuts on the lower side of the top plate.
Preferably, the fan assembly comprises an impeller, a rotating shaft, a cross-shaped bracket, a transmission belt and a motor, the motor is fixed on the upper end surface of the cover plate, and a driving belt wheel is fixed on the rotating shaft of the motor in a sleeved manner; one end of the rotating shaft is hinged to the bracket through a bearing, and the outer end of the bracket is fixed on the inner wall of the air guide cylinder; the other end fixedly connected with impeller of rotation axis, the plug bush is fixed with the driven pulley on the rotation axis between impeller and the support, and the driven pulley is connected with driving pulley through the drive belt, impeller, support and rotation axis all be located the air duct.
Preferably, two reinforcing strips are fixed on the inner wall of the lower side of the outer frame, the reinforcing strips are distributed on two sides of the maintenance slotted hole, and two ends of each reinforcing strip are fixed on the inner walls of the left side and the right side of the outer frame; and the side plate at the lower side of the air duct is provided with a buckle assembly opposite to the reinforcing strip.
Preferably, the buckle assembly comprises a horizontal circular baffle disc, and the front end and the rear end of the baffle disc extend out of the side plates of the air duct and abut against the upper end surface of the reinforcing strip; planar cutting grooves are formed on the opposite outer walls of the left side and the right side of the baffle disc; the center of the baffle disc is inserted with a screw which is screwed on the cover plate.
Preferably, the distance between the bottom surfaces of the cutting grooves on the two sides of the baffle disc is smaller than the distance between the end surfaces of the two ends of the air duct.
The invention has the beneficial effects that: the pipeline fan is adopted, and the whole pipeline fan does not need to be disassembled when the fan is taken out of the outer side of the pipeline; and the fan does not need to be moved to the ground, the ventilating pipeline can be directly overhauled, and the regular maintenance operation of the pipeline fan is facilitated.
Drawings
Fig. 1 is a schematic perspective view of the present invention.
FIG. 2 is a schematic perspective view of another embodiment of the present invention;
FIG. 3 is a front view of the present invention;
FIG. 4 is a schematic cross-sectional view taken along line A-A of FIG. 3;
fig. 5 is a schematic sectional view at B-B in fig. 3.
In the figure: 1. an outer frame; 11. connecting the frame; 12. mounting holes; 13. maintaining the slotted hole; 2. An air duct; 21. a side plate; 3. a fan assembly; 31. a rotating shaft; 32. a support; 33. an impeller; 34. a driven pulley; 35. a driving pulley; 36. a transmission belt; 37. a motor; 4. a cover plate; 5. a top plate; 6. a first bolt; 7. a buckle assembly; 71. a catch tray; 711. grooving; 72. A screw; 8. an internal thread connecting column; 81. a baffle ring; 9. a second bolt; 10. a connecting plate; 20. A nut; 30. and (5) reinforcing the strip.
Detailed Description
Example (b): as shown in fig. 1 to 5, the pipeline fan convenient for maintenance and management comprises a rectangular outer frame 1, wherein both ends of the outer frame 1 are bent to form a rectangular connecting frame 11, a plurality of mounting holes 12 are formed on the connecting frame 11, an air guide cylinder 2 is inserted into the outer frame 1, a fan assembly 3 is arranged on the air guide cylinder 2, and a rectangular maintenance groove hole 13 opposite to the air guide cylinder 2 is formed on the lower end surface of the outer frame 1; rectangular side plates 21 are formed by bending two ends of the air guide cylinder 2, a Jiong-shaped cover plate 4 is fixed between the side plates 21 at the lower side of the air guide cylinder 2, and the lower ends of the cover plate 4 and the side plates 21 are inserted into the maintenance groove hole 13 of the outer frame 1; a horizontal top plate 5 is fixedly inserted between the side plates 21 on the lower side of the air duct 2, two ends of the top plate 5 abut against the inner walls on two sides of the outer frame 1, a plurality of vertical first bolts 6 are inserted on the upper end face of the outer frame 1, and the first bolts 6 are screwed on the top plate 5; a plurality of vertical connecting plates 10 are fixedly inserted between the side plates 21 on the left side and the right side of the air duct 2, the connecting plates 10 are inserted with horizontal internal thread connecting columns 8, one ends of the internal thread connecting columns 8 abut against the inner wall of the outer frame 1, the other ends of the internal thread connecting columns are provided with baffle rings 81 in a forming mode, the baffle rings 81 abut against the connecting plates 10, a plurality of horizontal second bolts 9 are inserted on the side walls on the two sides of the outer frame 1, and the second bolts 9 are in threaded connection with the inside of the internal thread connecting columns 8.
The upper end surface of the side plate 21 of the air duct 2 is abutted against the inner wall of the upper side of the outer frame 1, and gaps are respectively arranged between the left side and the right side of the side plate 21 and the inner walls of the left side and the right side of the outer frame 1; the side plate 21 and the cover plate 4 are both abutted against the inner side wall of the maintenance slot hole 13.
The upper end face of the top plate 5 is flush with the upper end face of the side plate 21, a plurality of nuts 20 are fixedly welded on the lower end face of the top plate 5, and the first bolt 6 is screwed on the nuts 20 on the lower side of the top plate 5.
The fan assembly 3 comprises an impeller 33, a rotating shaft 31, a cross-shaped bracket 32, a transmission belt 36 and a motor 37, wherein the motor 37 is fixed on the upper end surface of the cover plate 4, and a driving belt wheel 35 is fixed on the rotating shaft of the motor 37 in a sleeved mode; one end of the rotating shaft 31 is hinged on the bracket 32 through a bearing, and the outer end of the bracket 32 is fixed on the inner wall of the air guide cylinder 2; the other end of the rotating shaft 31 is fixedly connected with an impeller 33, a driven pulley 34 is fixedly inserted on the rotating shaft 31 between the impeller 33 and the bracket 32, the driven pulley 34 is connected with a driving pulley 35 through a transmission belt 36, and the impeller 33, the bracket 32 and the rotating shaft 31 are all positioned in the air guide cylinder 2.
Two reinforcing strips 30 are fixed on the inner wall of the lower side of the outer frame 1, the reinforcing strips 30 are distributed on two sides of the maintenance slotted hole 13, and two ends of each reinforcing strip 30 are fixed on the inner walls of the left side and the right side of the outer frame 1; the side plate 21 at the lower side of the air duct 2 is provided with a buckle component 7 opposite to the reinforcing strip 30.
The buckle assembly 7 comprises a horizontal round baffle disc 71, and the front end and the rear end of the baffle disc 71 extend out of the side plate 21 of the air duct 2 and abut against the upper end surface of the reinforcing strip 30; planar cutting grooves 711 are formed on the opposite outer walls of the left side and the right side of the baffle disc 71; the center of the baffle disc 71 is inserted with a screw 72, and the screw 72 is screwed on the cover plate 4.
The distance between the bottom surfaces of the cutting grooves 711 on the two sides of the baffle disc 71 is smaller than the distance between the end surfaces of the two ends of the air guide cylinder 2; the cross section of the internal thread connecting column 8 is rectangular.
The working principle is as follows: the invention is a pipeline fan convenient for maintenance and management, the structure of the pipeline fan is shown in figure 1, and the pipeline fan can be fixedly connected with a ventilating pipeline through connecting frames 11 at two sides of an outer frame 1; during regular maintenance, the first bolt 6 and the second bolt 9 are used for fastening and connecting the air duct 2 and the outer frame 1, the first bolt 6 and the second bolt 9 are removed through rotation, the air duct 2 can be separated from the outer frame 1, and the fan assembly 3 composed of the impeller 33 and other components is installed on the air duct 2; in order to prevent the air duct 2 from suddenly dropping from the maintenance slotted hole 13 at the lower end of the outer frame 1 when the first bolt 6 and the second bolt 9 are disassembled, the buckle assembly 7 is arranged, and the baffle disc 71 on the buckle assembly 7 is rotated to realize that the two ends of the baffle disc 71 extend into the inner side of the air duct 2 to be separated from the reinforcing strip 30, so that the air duct 2 can be lifted to move out of the maintenance slotted hole 13 at the lower end of the outer frame 1;
finally, two ends of the top plate 5 are abutted against the inner wall of the lower end of the outer frame body 1; the air duct 2 and the fan assembly 3 in the air duct are hung on a ventilation pipeline, but the maintenance can be directly carried out, the fan does not need to be removed and then is moved to the ground for maintenance, and the maintenance work is facilitated.
The examples are intended to illustrate the invention, but not to limit it. The described embodiments may be modified by those skilled in the art without departing from the spirit and scope of the present invention, and therefore, the scope of the appended claims should be accorded the full scope of the invention as set forth in the appended claims.
Claims (7)
1. The utility model provides a pipeline fan convenient to maintain and manage, includes the outer frame (1) of rectangle, the shaping of all buckling at the both ends of outer frame (1) has the connection frame (11) of rectangle, and the shaping has a plurality of mounting holes (12), its characterized in that on connection frame (11): an air duct (2) is inserted in the outer frame (1), a fan assembly (3) is arranged on the air duct (2), and a rectangular maintenance groove hole (13) which is opposite to the air duct (2) is formed in the lower end face of the outer frame (1); rectangular side plates (21) are formed by bending two ends of the air guide cylinder (2), an Jiong-shaped cover plate (4) is fixed between the side plates (21) on the lower side of the air guide cylinder (2), and the lower ends of the cover plate (4) and the side plates (21) are inserted into a maintenance groove hole (13) of the outer frame (1); a horizontal top plate (5) is fixedly inserted between the side plates (21) on the lower side of the air guide cylinder (2), two ends of the top plate (5) abut against the inner walls on two sides of the outer frame (1), a plurality of vertical first bolts (6) are inserted into the upper end face of the outer frame (1), and the first bolts (6) are screwed on the top plate (5); a plurality of vertical connecting plates (10) are fixedly connected between the side plates (21) on the left side and the right side of the air duct (2) in an inserted mode, a horizontal internal thread connecting column (8) is connected with the connecting plates (10) in an inserted mode, one end of the internal thread connecting column (8) abuts against the inner wall of the outer frame (1), a blocking ring (81) is formed at the other end of the internal thread connecting column, the blocking ring (81) abuts against the connecting plates (10), a plurality of horizontal second bolts (9) are connected with the side walls on the two sides of the outer frame (1) in an inserted mode, and the second bolts (9) are connected in the internal thread connecting column (8) in a threaded mode.
2. The pipeline fan convenient for maintenance and management as claimed in claim 1, wherein: the upper end face of a side plate (21) of the air duct (2) is abutted against the inner wall of the upper side of the outer frame (1), and gaps are respectively arranged between the left side and the right side of the side plate (21) and the inner walls of the left side and the right side of the outer frame (1); the side plate (21) and the cover plate (4) are both abutted against the inner side wall of the maintenance groove hole (13).
3. The pipeline fan convenient for maintenance and management as claimed in claim 2, wherein: the upper end face of the top plate (5) is flush with the upper end face of the side plate (21), a plurality of nuts (20) are welded and fixed to the lower end face of the top plate (5), and the first bolt (6) is screwed on the nuts (20) on the lower side of the top plate (5).
4. The pipeline fan convenient for maintenance and management as claimed in claim 1, wherein: the fan assembly (3) comprises an impeller (33), a rotating shaft (31), a cross-shaped bracket (32), a transmission belt (36) and a motor (37), wherein the motor (37) is fixed on the upper end surface of the cover plate (4), and a driving belt wheel (35) is fixed on the rotating shaft of the motor (37) in a sleeved mode; one end of the rotating shaft (31) is hinged to the bracket (32) through a bearing, and the outer end of the bracket (32) is fixed on the inner wall of the air guide cylinder (2); the other end of the rotating shaft (31) is fixedly connected with an impeller (33), a driven belt wheel (34) is fixedly inserted and sleeved on the rotating shaft (31) between the impeller (33) and the support (32), the driven belt wheel (34) is connected with a driving belt wheel (35) through a transmission belt (36), and the impeller (33), the support (32) and the rotating shaft (31) are all located in the air guide cylinder (2).
5. The pipeline fan convenient for maintenance and management as claimed in claim 1, wherein: two reinforcing strips (30) are fixed on the inner wall of the lower side of the outer frame (1), the reinforcing strips (30) are distributed on two sides of the maintenance slotted hole (13), and two ends of each reinforcing strip (30) are fixed on the inner walls of the left side and the right side of the outer frame (1); and a buckle component (7) opposite to the reinforcing strip (30) is arranged on the side plate (21) at the lower side of the air duct (2).
6. The pipeline fan convenient for maintenance and management as claimed in claim 5, wherein: the buckle assembly (7) comprises a horizontal circular baffle disc (71), and the front end and the rear end of the baffle disc (71) extend out of the side plate (21) of the air duct (2) and abut against the upper end surface of the reinforcing strip (30); planar cutting grooves (711) are formed on the opposite outer walls of the left side and the right side of the baffle disc (71); the center of the baffle disc (71) is inserted with a screw (72), and the screw (72) is screwed on the cover plate (4).
7. The pipeline fan convenient for maintenance and management as claimed in claim 6, wherein: the distance between the bottom surfaces of the cutting grooves (711) on the two sides of the baffle disc (71) is smaller than the distance between the end surfaces of the two ends of the air guide cylinder (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111065037.9A CN113915151A (en) | 2021-09-11 | 2021-09-11 | Pipeline fan convenient to maintain and manage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111065037.9A CN113915151A (en) | 2021-09-11 | 2021-09-11 | Pipeline fan convenient to maintain and manage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113915151A true CN113915151A (en) | 2022-01-11 |
Family
ID=79234807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111065037.9A Pending CN113915151A (en) | 2021-09-11 | 2021-09-11 | Pipeline fan convenient to maintain and manage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113915151A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3085952U (en) * | 2000-11-10 | 2002-05-31 | ジョイン−ワン・エレクトリック（シェンツェン）カンパニー・リミテッド | Decomposable ventilation fan |
| CN204704130U (en) * | 2015-04-14 | 2015-10-14 | 陈文治 | A kind of combined axial fan |
| CN207660865U (en) * | 2017-12-15 | 2018-07-27 | 深圳市联合智造商务有限公司 | 75 pipeline fans |
| CN109595187A (en) * | 2019-01-23 | 2019-04-09 | 广东爱美信电器有限公司 | Ventilation blower and ventilating system |
| CN210715206U (en) * | 2019-10-21 | 2020-06-09 | 浙江惠创风机有限公司 | Low-noise environment-friendly square wall type side wall fan |
| CN211174718U (en) * | 2019-10-12 | 2020-08-04 | 安徽悦达环保科技有限公司 | Ventilation fan equipment convenient to installation |
| CN111852911A (en) * | 2020-07-14 | 2020-10-30 | 英飞同仁风机股份有限公司 | Direct-connection fan |
| CN111980965A (en) * | 2020-08-19 | 2020-11-24 | 咸宁新创工业设计有限公司 | Outer frame with exhaust fan upper belt mounting and positioning structure |
| CN212389554U (en) * | 2020-05-22 | 2021-01-22 | 广东特菱节能空调设备有限公司 | Coaxial multilayer fan blade fan |
-
2021
- 2021-09-11 CN CN202111065037.9A patent/CN113915151A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3085952U (en) * | 2000-11-10 | 2002-05-31 | ジョイン−ワン・エレクトリック（シェンツェン）カンパニー・リミテッド | Decomposable ventilation fan |
| CN204704130U (en) * | 2015-04-14 | 2015-10-14 | 陈文治 | A kind of combined axial fan |
| CN207660865U (en) * | 2017-12-15 | 2018-07-27 | 深圳市联合智造商务有限公司 | 75 pipeline fans |
| CN109595187A (en) * | 2019-01-23 | 2019-04-09 | 广东爱美信电器有限公司 | Ventilation blower and ventilating system |
| CN211174718U (en) * | 2019-10-12 | 2020-08-04 | 安徽悦达环保科技有限公司 | Ventilation fan equipment convenient to installation |
| CN210715206U (en) * | 2019-10-21 | 2020-06-09 | 浙江惠创风机有限公司 | Low-noise environment-friendly square wall type side wall fan |
| CN212389554U (en) * | 2020-05-22 | 2021-01-22 | 广东特菱节能空调设备有限公司 | Coaxial multilayer fan blade fan |
| CN111852911A (en) * | 2020-07-14 | 2020-10-30 | 英飞同仁风机股份有限公司 | Direct-connection fan |
| CN111980965A (en) * | 2020-08-19 | 2020-11-24 | 咸宁新创工业设计有限公司 | Outer frame with exhaust fan upper belt mounting and positioning structure |
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