CN220748572U - Two-stage centrifugal fan with impellers arranged in sequence - Google Patents
Two-stage centrifugal fan with impellers arranged in sequence Download PDFInfo
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- CN220748572U CN220748572U CN202322352628.5U CN202322352628U CN220748572U CN 220748572 U CN220748572 U CN 220748572U CN 202322352628 U CN202322352628 U CN 202322352628U CN 220748572 U CN220748572 U CN 220748572U
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Abstract
The utility model belongs to the technical field of centrifugal fans, and particularly discloses a two-stage centrifugal fan with impellers arranged in sequence, which comprises a main shaft, a first-stage air inlet group and a second-stage air inlet group, wherein the first-stage air inlet group comprises a first-stage air inlet box, a first-stage air inlet, a first-stage casing group and a first-stage fan impeller; the secondary air inlet group comprises a secondary air inlet box, a secondary air inlet, a secondary shell group and a secondary fan impeller; the main shaft sequentially passes through the first-stage shell group, the first-stage air inlet box, the second-stage shell group, the second-stage air inlet and the second-stage air inlet box; the second-level air inlet box is communicated with an air outlet of the first-level shell group. The scheme has the advantages of compact structural design, convenient installation and reliable operation, not only occupies small space during installation and saves the use space, but also enlarges the pressure of gas through two-stage supercharging, and meets the performance requirement.
Description
Technical Field
The utility model belongs to the technical field of centrifugal fans, and particularly relates to a two-stage centrifugal fan with sequentially arranged impellers.
Background
In the design and model selection process of the centrifugal machine, one centrifugal fan cannot meet the performance requirement due to various reasons, so that a plurality of centrifugal fans are often connected in parallel or in series to meet the performance requirement, but due to the structure, the centrifugal fans are large in whole, occupy large installation positions during installation, and meanwhile are driven to operate by motors, and the manufacturing cost is high.
The existing centrifugal fan mainly comprises a transmission shell and a transmission fan impeller, wherein the transmission shell mainly comprises a single-suction transmission shell and a double-suction transmission shell, the single-suction transmission shell consists of an air inlet box and a volute, the double-suction transmission shell consists of two air inlet boxes and a volute, the transmission fan impeller is positioned in the volute, and the structure is combined and connected in any way, so that the defect of smaller air pressure of the fan exists.
Disclosure of Invention
The utility model aims to provide a two-stage centrifugal fan with impellers arranged in sequence, so as to solve the problem of small gas pressure of the conventional centrifugal fan.
In order to achieve the above purpose, the technical scheme of the utility model is as follows: the two-stage centrifugal fan with the impellers sequentially arranged comprises a main shaft, a first-stage air inlet group and a second-stage air inlet group, wherein the first-stage air inlet group comprises a first-stage air inlet box, a first-stage air inlet, a first-stage casing group and a first-stage fan impeller, two sides of the first-stage air inlet are respectively connected with the first-stage air inlet box and the first-stage casing group, and the first-stage fan impeller is arranged in the first-stage casing group; the secondary air inlet group comprises a secondary air inlet box, a secondary air inlet, a secondary shell group and a secondary fan impeller, wherein two sides of the secondary air inlet are respectively connected with the secondary air inlet box and the secondary shell group, and the secondary fan impeller is arranged in the secondary shell group; the main shaft sequentially passes through the first-stage shell group, the first-stage air inlet box, the second-stage shell group, the second-stage air inlet and the second-stage air inlet box, is respectively fixed with the first-stage fan impeller and the second-stage fan impeller, and is respectively in rotary connection with the first-stage shell group, the second-stage shell group, the first-stage air inlet box and the second-stage air inlet box; the secondary air inlet box is communicated with the air outlet of the primary shell group through a communicating piece.
Further, an air outlet box is connected to the air outlet of the primary shell group, and the air outlet box is communicated with the communicating piece.
Further, the communicating piece adopts a connecting bent pipe.
Further, the first-stage air inlet box and the second-stage air inlet box comprise an air inlet upper box body and an air inlet lower box body which are arranged up and down and are communicated, and the air inlet upper box body is an arc box body which is transited from a circular structure to a rectangular structure from top to bottom; the upper side of the air inlet lower box body is matched with and communicated with the rectangular structure; one side of the air inlet lower box body is provided with a first through hole connected with the main shaft, and the other side of the air inlet lower box body is provided with a second through hole connected with the primary air inlet or the secondary air inlet.
Further, the structure of the air outlet box is the same as that of the air inlet upper box body, the rectangular structure of the air outlet box is connected with the air outlet of the primary shell group, and the circular structure of the air outlet box is connected with the communicating piece.
Further, the device also comprises two bearing boxes arranged on the main shaft, wherein the two bearing boxes are respectively arranged on two sides of the primary air inlet group and the secondary air inlet group.
Further, the diameter of the circular structure is smaller than the length of the rectangular structure and larger than the width of the rectangular structure.
Further, the lower box that admits air includes upper rectangular cavity and the half arc cavity of lower that sets up from top to bottom and communicates, the length of upper rectangular cavity equals the diameter of half arc cavity down.
The working principle of the technical scheme is as follows: the gas enters from the first-stage air inlet box, sequentially passes through the first-stage air inlet, the first-stage shell group and the first-stage fan impeller, passes through the first-stage fan She Lunzuo, and then the gas pressure is increased, the gas with increased pressure is discharged from the air outlet of the first-stage shell group to the air outlet box, then enters into the second-stage air inlet box through the connecting bent pipe, sequentially passes through the second-stage air inlet, the second-stage shell group and the second-stage fan impeller, further increases the gas pressure through the second-stage fan She Lunzuo, meets the pressure requirement, and finally is discharged through the air outlet of the second-stage shell group.
The beneficial effects of this technical scheme lie in:
(1) the utility model has the advantages of compact structural design, convenient installation and reliable operation, and by adopting the device, the occupied space is smaller during installation, the use space is saved, and meanwhile, the pressure of gas is enlarged through two-stage supercharging, thereby meeting the performance requirement.
(2) This technical scheme has carried out the arc design to the structure of one-level inlet box, second grade inlet box and air outlet box, can make the inlet air more add even and alleviate smoothly.
(3) The side of the lower air inlet box body is a plane, so that the stability of connection of the lower air inlet box body with the main shaft and the air inlet can be ensured.
Drawings
FIG. 1 is a perspective view of a two-stage centrifugal fan with impellers arranged in sequence;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a side view of FIG. 2;
FIG. 4 is a top view of FIG. 2;
fig. 5 is a schematic view of the structure of the primary air intake box and the secondary air intake box in fig. 1.
Detailed Description
The following is a further detailed description of the embodiments:
reference numerals in the drawings of the specification include: the main shaft 1, the first-stage air inlet box 2, the first-stage air inlet 3, the first-stage casing group 4, the first-stage air inlet group 5, the second-stage air inlet box 6, the second-stage air inlet 7, the second-stage casing group 8, the second-stage fan impeller 9, the communicating piece 10, the bearing box 11, the air outlet box 12, the circular structure 13, the air inlet upper box 14, the air inlet lower box 15, the upper rectangular cavity 16, the lower semi-arc cavity 17, the first through hole 18, the second through hole 19 and the second-stage air inlet group 20.
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The embodiment is basically as shown in the accompanying figures 1-5: the two-stage centrifugal fan with the impellers sequentially arranged comprises a main shaft 1, a first-stage air inlet group 5 and a second-stage air inlet group 20, wherein the first-stage air inlet group 5 comprises a first-stage air inlet box 2, a first-stage air inlet 3, a first-stage casing group 4 and a first-stage fan impeller, two sides of the first-stage air inlet 3 are respectively connected with the first-stage air inlet box 2 and the first-stage casing group 4, and the first-stage fan impeller is arranged in the first-stage casing group 4; the secondary air inlet group 20 comprises a secondary air inlet box 6, a secondary air inlet 7, a secondary shell group 8 and a secondary fan impeller 9, wherein two sides of the secondary air inlet 7 are respectively connected with the secondary air inlet box 6 and the secondary shell group 8, and the secondary fan impeller 9 is arranged in the secondary shell group 8; the main shaft 1 sequentially passes through the first-stage shell group 4, the first-stage air inlet 3, the first-stage air inlet box 2, the second-stage shell group 8, the second-stage air inlet 7 and the second-stage air inlet box 6, the main shaft 1 is respectively fixed with the first-stage fan impeller and the second-stage fan impeller 9, and the main shaft 1 is respectively in rotary connection with the first-stage shell group 4, the second-stage shell group 8, the first-stage air inlet box 2 and the second-stage air inlet box 6; the air outlet of the primary shell group 4 is connected with an air outlet box 12, the secondary air inlet box 6 is communicated with the air outlet box 12 through a communicating piece 10, and the communicating piece 10 specifically adopts a connecting bent pipe.
As shown in fig. 5, the primary air intake box 2 and the secondary air intake box 6 each include an air intake upper box 14 and an air intake lower box 15 which are arranged up and down and are communicated, the air intake upper box 14 is an arc box which is transited from a circular structure 13 to a rectangular structure from top to bottom, and the diameter of the circular structure 13 is smaller than the length of the rectangular structure and larger than the width of the rectangular structure. The air inlet lower box body 15 comprises an upper rectangular cavity 16 and a lower semi-arc cavity 17 which are arranged up and down and are communicated, and the length of the upper rectangular cavity 16 is equal to the diameter of the lower semi-arc cavity 17. The upper side of the air inlet lower box body 15 is matched with and communicated with the rectangular structure; one side of the lower air inlet box body 15 is provided with a first through hole 18 connected with the main shaft 1, and the other side of the lower air inlet box body 15 is provided with a second through hole 19 connected with the primary air inlet 3 or the secondary air inlet 7.
The structure of the air outlet box 12 is the same as that of the air inlet upper box 14, the rectangular structure of the air outlet box 12 is connected with the air outlet of the primary shell group 4, and the circular structure 13 of the air outlet box 12 is connected with a connecting bent pipe.
The main shaft 1 is provided with two bearing boxes 11, and the two bearing boxes 11 are respectively arranged at two sides of the primary air inlet group 5 and the secondary air inlet group 20. The locating bearing box 11 is arranged on the side close to the primary air inlet group 5, and the non-locating bearing box 11 is arranged on the side close to the secondary air inlet group 20.
The specific implementation process is as follows:
the gas firstly enters from the first-stage air inlet box 2, sequentially passes through the first-stage air inlet 3, the first-stage shell group 4 and the first-stage fan impeller, after passing through the work of the first-stage fan She Lunzuo, the gas pressure is increased, then the gas with increased pressure is discharged from the air outlet of the first-stage shell group 4 to the air outlet box 12, then enters into the second-stage air inlet box 6 through the connecting bent pipe, then sequentially passes through the second-stage air inlet 7, the second-stage shell group 8 and the second-stage fan impeller 9, works through the second-stage fan impeller 9, the gas pressure is further increased, the pressure requirement is reached, and finally the gas is discharged through the air outlet of the second-stage shell group 8.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The foregoing is merely an embodiment of the present utility model, and a specific structure and characteristics of common knowledge in the art, which are well known in the scheme, are not described herein, so that a person of ordinary skill in the art knows all the prior art in the application day or before the priority date of the present utility model, and can know all the prior art in the field, and have the capability of applying the conventional experimental means before the date, so that a person of ordinary skill in the art can complete and implement the present embodiment in combination with his own capability in the light of the present application, and some typical known structures or known methods should not be an obstacle for a person of ordinary skill in the art to implement the present application. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present utility model, and these should also be considered as the scope of the present utility model, which does not affect the effect of the implementation of the present utility model and the utility of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (8)
1. A doublestage centrifugal fan that impeller arranged in order, its characterized in that: the air inlet device comprises a main shaft (1), a first-stage air inlet group (5) and a second-stage air inlet group (20), wherein the first-stage air inlet group (5) comprises a first-stage air inlet box (2), a first-stage air inlet (3), a first-stage casing group (4) and a first-stage fan impeller, two sides of the first-stage air inlet (3) are respectively connected with the first-stage air inlet box (2) and the first-stage casing group (4), and the first-stage fan impeller is arranged in the first-stage casing group (4); the secondary air inlet set (20) comprises a secondary air inlet box (6), a secondary air inlet (7), a secondary casing set (8) and a secondary fan impeller (9), wherein two sides of the secondary air inlet (7) are respectively connected with the secondary air inlet box (6) and the secondary casing set (8), and the secondary fan impeller (9) is arranged in the secondary casing set (8); the main shaft (1) sequentially penetrates through the first-stage shell group (4), the first-stage air inlet (3), the first-stage air inlet box (2), the second-stage shell group (8), the second-stage air inlet (7) and the second-stage air inlet box (6), the main shaft (1) is respectively fixed with the first-stage fan impeller and the second-stage fan impeller (9), and the main shaft (1) is respectively connected with the first-stage shell group (4), the second-stage shell group (8), the first-stage air inlet box (2) and the second-stage air inlet box (6) in a rotating manner; the secondary air inlet box (6) is communicated with the air outlet of the primary shell group (4) through a communication piece (10).
2. The two-stage centrifugal fan with sequentially arranged impellers according to claim 1, wherein: an air outlet box (12) is connected to the air outlet of the primary shell group (4), and the air outlet box (12) is communicated with the communicating piece (10).
3. The two-stage centrifugal fan with sequentially arranged impellers according to claim 1, wherein: the communicating piece (10) adopts a connecting bent pipe.
4. The two-stage centrifugal fan with sequentially arranged impellers according to claim 2, wherein: the primary air inlet box (2) and the secondary air inlet box (6) comprise an air inlet upper box body (14) and an air inlet lower box body (15) which are arranged up and down and are communicated, and the air inlet upper box body (14) is an arc box body which is transited from a circular structure (13) to a rectangular structure from top to bottom; the upper side of the air inlet lower box body (15) is matched with and communicated with the rectangular structure; one side of the air inlet lower box body (15) is provided with a first through hole (18) connected with the main shaft (1), and the other side of the air inlet lower box body (15) is provided with a second through hole (19) connected with the primary air inlet (3) or the secondary air inlet (7).
5. The two-stage centrifugal fan with sequentially arranged impellers according to claim 4, wherein: the structure of the air outlet box (12) is the same as that of the air inlet upper box body (14), the rectangular structure of the air outlet box (12) is connected with the air outlet of the primary shell group (4), and the circular structure (13) of the air outlet box (12) is connected with the communicating piece (10).
6. The two-stage centrifugal fan with sequentially arranged impellers according to claim 1, wherein: the device also comprises two bearing boxes (11) arranged on the main shaft (1), wherein the two bearing boxes (11) are respectively arranged on two sides of the primary air inlet group (5) and the secondary air inlet group (20).
7. The two-stage centrifugal fan with sequentially arranged impellers according to claim 5, wherein: the diameter of the circular structure (13) is smaller than the length of the rectangular structure and larger than the width of the rectangular structure.
8. The two-stage centrifugal fan with sequentially arranged impellers according to claim 4, wherein: the air inlet lower box body (15) comprises an upper rectangular cavity (16) and a lower semi-arc cavity (17) which are arranged up and down and are communicated, and the length of the upper rectangular cavity (16) is equal to the diameter of the lower semi-arc cavity (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322352628.5U CN220748572U (en) | 2023-08-31 | 2023-08-31 | Two-stage centrifugal fan with impellers arranged in sequence |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322352628.5U CN220748572U (en) | 2023-08-31 | 2023-08-31 | Two-stage centrifugal fan with impellers arranged in sequence |
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| Publication Number | Publication Date |
|---|---|
| CN220748572U true CN220748572U (en) | 2024-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322352628.5U Active CN220748572U (en) | 2023-08-31 | 2023-08-31 | Two-stage centrifugal fan with impellers arranged in sequence |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220748572U (en) |
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2023
- 2023-08-31 CN CN202322352628.5U patent/CN220748572U/en active Active
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