CN216554567U - Centrifugal fan that labyrinth tower connects - Google Patents
Centrifugal fan that labyrinth tower connects Download PDFInfo
- Publication number
- CN216554567U CN216554567U CN202122654632.8U CN202122654632U CN216554567U CN 216554567 U CN216554567 U CN 216554567U CN 202122654632 U CN202122654632 U CN 202122654632U CN 216554567 U CN216554567 U CN 216554567U
- Authority
- CN
- China
- Prior art keywords
- labyrinth
- annular baffle
- centrifugal fan
- tower
- upper annular
- 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.)
- Active
Links
- 238000000926 separation method Methods 0.000 claims description 26
- 238000009434 installation Methods 0.000 abstract description 4
- 238000003754 machining Methods 0.000 description 9
- 230000000903 blocking effect Effects 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008602 contraction Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model relates to the technical field of fans, in particular to a labyrinth tower-connected centrifugal fan which comprises at least two upper annular retaining pieces connected to the inner wall of a front cover plate of an impeller and at least two lower annular retaining pieces connected to the outer wall of an air inlet, wherein the upper annular retaining pieces and the lower annular retaining pieces are matched with each other to form labyrinth lap joint. The inner diameters of two adjacent upper annular baffle plates are gradually reduced from front to back, and the outer diameters of two adjacent lower annular baffle plates are correspondingly and gradually increased from front to back. The lap joint gap is in a labyrinth lap joint, so that the installation is easy, and the assembly and processing efficiency is improved; the processing error is increased, the easy processing is realized, and the processing cost is reduced.
Description
Technical Field
The utility model relates to the technical field of fans, in particular to a centrifugal fan connected with a labyrinth tower.
Background
There are many gaps in the fan and the pressure at the ends of the gaps is different and gas leaks through the gaps from the high pressure side to the low pressure side. Thus, the gas, which receives a certain amount of energy from the fan, is not completely transported away, and the energy is lost in the form of losses. The leakage part in the fan is different due to different structures and generally occurs at the lap joint part of the air inlet and the impeller. The smaller the lap gap, the less leakage; the longer the overlap length, the less leakage, the higher the fan efficiency and the lower the noise.
In the production process, the overlap joint clearance of the fan is greatly influenced by the manufacturing mode after assembly. The lap joint part adopts machining and accurate positioning, the lap joint clearance is small, the leakage is less, the fan efficiency is high, but the machining cost is high, the machining time is long, and the lap joint part is not frequently adopted. The lap joint part is processed by modes of compression, spinning, tailor welding and the like, has larger dimensional tolerance, large lap joint clearance, large leakage amount and reduced fan efficiency, but has low processing cost and high production efficiency and is widely adopted.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a labyrinth tower-connected centrifugal fan which has the advantages of less leakage, high efficiency, convenient processing and manufacturing, low processing cost, convenient installation and maintenance and easy implementation and popularization aiming at the defects in the prior art.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a centrifugal fan that labyrinth tower connects, includes air intake, casing, impeller and motor, still includes that at least two connect at the last annular separation blade of impeller front shroud inner wall and at least two connect the lower annular separation blade at the air intake outer wall and mutually support, constitute the labyrinth overlap joint.
Further, the inner diameters of two adjacent upper annular baffle plates are gradually reduced from front to back, the outer diameters of two adjacent lower annular baffle plates are correspondingly and gradually increased from front to back, and Da is larger than Daa and larger than Dc; da is the inner diameter of the first upper annular baffle plate, Dc is the inner diameter of the last-last upper annular baffle plate, and Daa is the outer diameter of the last-last lower annular baffle plate.
Further, Db > Daa > Dc, or Da > Daa > Db; db is the inner diameter of any one of the middle upper annular baffle plates.
Further, the axial distance between two adjacent upper annular separation blades is equal, and the axial distance between the two adjacent lower annular separation blades is equal.
Furthermore, the inner diameter of the upper annular baffle plate is gradually decreased from front to back, and the outer diameter of the lower annular baffle plate is correspondingly gradually increased from front to back.
Furthermore, the tolerance of the lapping depth C is 0-15 mm, and the lapping gap A is 0-5 mm; the radial fit clearance B between the air inlet and the impeller is 3-5 mm.
Furthermore, the distance between the first upper annular separation blade and the inlet end face of the impeller is 3-5 mm, and the distance between the first lower annular separation blade and the outlet end face of the air inlet is 3-5 mm.
Furthermore, the number of the upper annular separation blades is equal to that of the lower annular separation blades, and the number of the upper annular separation blades is 2-5.
Has the advantages that: the lap joint gap is in a labyrinth type lap joint, and the airflow in the lap joint gap repeatedly changes in a rapid contraction mode and a rapid expansion mode, so that the leakage resistance is greatly increased, the leakage amount is reduced, the leakage of the gas from the lap joint gap by bypassing the front cover plate of the impeller can be effectively reduced, and the efficiency of the fan is improved; the lap joint depth is flexible, the adjustable range is large, the assembly error is increased, the influence of the lap joint depth matching on the performance of the fan is reduced, the easy installation is realized, and the assembly and processing efficiency is improved; the tolerance of the fit clearance is increased, the machining error is increased, the easiness in machining is realized, and the machining cost is reduced.
Drawings
FIG. 1 is a first schematic view of a partially enlarged structure of a lap joint gap;
FIG. 2 is a second enlarged view of the lap gap;
FIG. 3 is a third schematic view of a partially enlarged structure of the lap gap;
FIG. 4 is a fourth schematic view of a partially enlarged structure of the lap gap;
FIG. 5 is a schematic view of the overall structure of the present invention;
in the figure, an air inlet 1, an impeller 2, a casing 3, a motor 4 and an impeller front cover plate 5.
Detailed Description
The utility model is further illustrated by the following examples and figures.
In the utility model, the front to back of the upper annular baffle plate refers to a to c, and the front to back of the lower annular baffle plate refers to cc to aa.
Example one
Fig. 5 shows a labyrinth tower-connected centrifugal fan, which comprises an air inlet 1, an impeller 2, a casing 3, a motor 4, at least two upper annular separation blades connected to the inner wall of an impeller front cover plate 5 and at least two lower annular separation blades connected to the outer wall of the air inlet 1, wherein the upper annular separation blades and the lower annular separation blades are mutually matched to form a labyrinth lap joint.
The inner diameters of two adjacent upper annular baffle plates are gradually reduced from front to back, the outer diameters of two adjacent lower annular baffle plates are correspondingly and gradually increased from front to back, and Da is larger than Daa and Dc is larger than Da; da is the inner diameter of the first upper annular baffle plate, Dc is the inner diameter of the last-last upper annular baffle plate, and Daa is the outer diameter of the last-last lower annular baffle plate.
The radial fit clearance B between the air inlet 1 and the impeller 2 is preferably 3-5 mm. The distance between the first upper annular separation blade and the inlet end face of the impeller 2 is 3-5 mm, and the distance between the first lower annular separation blade and the outlet end face of the air inlet 1 is 3-5 mm. The distance can also be fine-tuned according to actual conditions.
The number of the upper annular separation blade is equal to that of the lower annular separation blade, and the number of the upper annular separation blade is 2-5.
As shown in fig. 1, the number of the upper ring-shaped blocking pieces and the lower ring-shaped blocking pieces in this embodiment is 3, that is, the upper ring-shaped blocking pieces are a, b and c from front to back, Da > Db > Dc, the lower ring-shaped blocking pieces are cc, bb and aa from front to back, and Da > Dbb > Dc.
Each lower annular separation blade can be correspondingly aligned with each upper annular separation blade and can also be staggered with the corresponding upper annular separation blade.
In the implementation, an upper annular baffle sheet and a lower annular baffle sheet at the lap joint part of the air inlet 1 of the fan and the impeller 2 are distributed in a step shape and are opposite up and down to form a labyrinth-shaped leakage-proof cavity. In the prior art, high-pressure gas bypasses the front cover plate 5 of the impeller and leaks from the lap joint gap, so that the performance of the fan is affected. When the high-pressure gas passes through the lap joint gap of the structure, the changes of 'quick contraction-quick expansion-quick contraction-quick expansion' occur, the leakage resistance is greatly increased, the leakage amount is effectively reduced, and the pressure and the efficiency of the fan are improved.
After the traditional fan is manufactured, the lapping gap between the air inlet 1 and the impeller 2 is a fixed value, the lapping structure of the utility model forms a conical lapping gap A, and the variable lapping gap is realized by adjusting the lapping depth C. The tolerance of the overlap joint depth C is 0-15 mm, the range of the overlap joint gap A is 0-5 mm, and the overlap joint gap C is adjusted according to the size of an actual fan.
The small overlap joint clearance A can be realized, the large fit clearance B, B is larger than A, the conventional fan, B = A, and the larger the fit clearance is, the easier the processing is.
Example two
The non-mentioned portions of this embodiment are as described in the above embodiments.
The axial distances between the two adjacent upper annular separation blades are equal, and the axial distances between the two adjacent upper annular separation blades and the axial distances between the two adjacent lower annular separation blades are equal; namely La-b = Lb-c = Laa-bb = Lbb-cc。
The inner diameter of the upper annular baffle plate is gradually decreased from front to back, and the outer diameter of the lower annular baffle plate is correspondingly gradually increased from front to back; i.e., Da-Db = Db-Dc = Daa-Dbb = Dbb-Dcc, in a linear variation.
As shown in FIG. 2, Da > Daa > Db; db is the inner diameter of an upper annular baffle plate in the middle.
EXAMPLE III
The non-mentioned portions of this embodiment are as described in the above embodiments.
As shown in fig. 3, in this embodiment, the number of the upper ring baffle and the lower ring baffle is 5, the middle upper ring baffle includes b1, b2 and b3, i.e., the upper ring baffle is a, b1, b2, b3 and c from front to back, the middle upper ring baffle includes bb1, bb2 and bb3, and the lower ring baffle is cc, bb1, bb2, bb3 and aa from front to back.
In this example, Da > Db1> Db2> Db3 is not less than Da > Dc.
Example four
The non-mentioned portions of this embodiment are as described in the above embodiments.
As shown in fig. 4, the number of the upper annular blocking plate and the lower annular blocking plate in this embodiment is two, and it is obvious that the upper annular blocking plate and the lower annular blocking plate do not change linearly as long as they do not affect the assembly.
In conclusion, the lap joint gap is in a labyrinth type lap joint, the airflow in the lap joint gap is repeatedly changed into rapid contraction and rapid expansion, the leakage resistance is greatly increased, the leakage amount is reduced, the leakage of the air from the lap joint gap by bypassing the front cover plate 5 of the impeller can be effectively reduced, and the efficiency of the fan is improved; the lap joint depth is flexible, the adjustable range is large, the assembly error is increased, the influence of the lap joint depth matching on the performance of the fan is reduced, the easy installation is realized, and the assembly and processing efficiency is improved; the tolerance of the fit clearance is increased, the machining error is increased, the easiness in machining is realized, and the machining cost is reduced.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will 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 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 invention.
Claims (8)
1. The utility model provides a centrifugal fan that labyrinth tower connects, includes air intake, casing, impeller and motor, its characterized in that still includes two at least last annular separation blade of connecting at impeller front shroud inner wall and two at least lower annular separation blades of connecting at the air intake outer wall and mutually supports, constitutes the labyrinth overlap joint.
2. The labyrinth tower-connected centrifugal fan according to claim 1, wherein the inner diameters of two adjacent upper annular baffle plates are gradually reduced from front to back, the outer diameters of two adjacent lower annular baffle plates are correspondingly gradually increased from front to back, and Da > Daa > Dc; da is the inner diameter of the first upper annular baffle plate, Dc is the inner diameter of the last-last upper annular baffle plate, and Daa is the outer diameter of the last-last lower annular baffle plate.
3. The labyrinthine towered centrifugal fan of claim 2, wherein Db > Daa > Dc, or Da > Daa > Db; db is the inner diameter of any one of the middle upper annular baffle plates.
4. The labyrinthine tower-connected centrifugal fan of claim 1, wherein the axial distance of the adjacent two upper annular flaps is equal and the axial distance of the adjacent two lower annular flaps is equal.
5. The labyrinth tower-connected centrifugal fan according to claim 1, wherein the inner diameters of the annular baffle plates decrease sequentially from front to back, and the outer diameters of the lower annular baffle plates correspondingly increase sequentially from front to back.
6. The labyrinth tower-connected centrifugal fan as claimed in claim 1, wherein the tolerance of the overlap depth C is 0 to 15mm, and the overlap gap a is 0 to 5 mm; the radial fit clearance B between the air inlet and the impeller is 3-5 mm.
7. The labyrinth tower-connected centrifugal fan as claimed in claim 1, wherein the first upper annular baffle is 3-5 mm away from the inlet end face of the impeller, and the first lower annular baffle is 3-5 mm away from the outlet end face of the air inlet.
8. The labyrinth tower-connected centrifugal fan as claimed in claim 1, wherein the number of the upper annular baffle plate and the lower annular baffle plate is equal, and is 2-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122654632.8U CN216554567U (en) | 2021-10-29 | 2021-10-29 | Centrifugal fan that labyrinth tower connects |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122654632.8U CN216554567U (en) | 2021-10-29 | 2021-10-29 | Centrifugal fan that labyrinth tower connects |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216554567U true CN216554567U (en) | 2022-05-17 |
Family
ID=81569653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122654632.8U Active CN216554567U (en) | 2021-10-29 | 2021-10-29 | Centrifugal fan that labyrinth tower connects |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216554567U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114352569A (en) * | 2021-10-29 | 2022-04-15 | 威海克莱特菲尔风机股份有限公司 | Lapped centrifugal fan of labyrinth |
-
2021
- 2021-10-29 CN CN202122654632.8U patent/CN216554567U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114352569A (en) * | 2021-10-29 | 2022-04-15 | 威海克莱特菲尔风机股份有限公司 | Lapped centrifugal fan of labyrinth |
| CN114352569B (en) * | 2021-10-29 | 2025-02-14 | 威海克莱特菲尔风机股份有限公司 | A centrifugal fan with labyrinth-type overlap |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113236607B (en) | A design method of a large engineering pump volute and its volute | |
| CN101946094A (en) | Circulation structure for a turbo compressor | |
| CN104895841B (en) | Rectifier, flow passage structure, combined compressor, aero gas turbine engine | |
| CN103354859B (en) | Blade profile and platform assembly for supersonic flow | |
| CN111649005B (en) | Axial-flow fan and dryer of air conditioner | |
| CN112377268A (en) | Integrated diffuser for additive manufacturing | |
| CN1580497A (en) | Turbine bucket tip shroud edge profile | |
| CN216554567U (en) | Centrifugal fan that labyrinth tower connects | |
| CN114135521A (en) | Centrifugal Compressor Stage Tandem Diffuser | |
| US20160252101A1 (en) | Centrifugal compressor impeller with blades having an s-shaped trailing edge | |
| CN113339325B (en) | Inlet stage blade assembly for compressor and axial flow compressor comprising same | |
| CN110645172B (en) | A screw vacuum pump rotor and screw vacuum pump | |
| CN118517435B (en) | High-efficient low noise centrifugal fan | |
| CN114352569B (en) | A centrifugal fan with labyrinth-type overlap | |
| CN116044514B (en) | Turbine and turbocharger | |
| WO2018002618A1 (en) | Centrifugal compressor with diffuser with throat | |
| US10851801B2 (en) | Centrifugal compressor system and diffuser | |
| CN111255747A (en) | Integrated diffuser connecting structure for centrifugal compressor | |
| CN114810663B (en) | A centrifugal/diagonal flow compressor back bearing structure | |
| CN211778224U (en) | Two-section diffuser | |
| CN113090412B (en) | Supercharging stage device and turbofan engine | |
| CN105298921A (en) | Inter-stage U-shaped mixing diffuser for two-stage centrifugal gas compressor | |
| CN112343864A (en) | Industrial application compressor unit | |
| CN109611346A (en) | Centrifugal compressor and its design method | |
| CN211116803U (en) | Integrally-manufactured volute and steam compressor thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |