CN113175446B - Rectifying structure of multi-wing centrifugal fan for compressor cooling system - Google Patents
Rectifying structure of multi-wing centrifugal fan for compressor cooling system Download PDFInfo
- Publication number
- CN113175446B CN113175446B CN202110381803.6A CN202110381803A CN113175446B CN 113175446 B CN113175446 B CN 113175446B CN 202110381803 A CN202110381803 A CN 202110381803A CN 113175446 B CN113175446 B CN 113175446B
- Authority
- CN
- China
- Prior art keywords
- net
- rectifying
- diffuser
- centrifugal fan
- cooling system
- 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
Images
Classifications
-
- 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
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/441—Fluid-guiding means, e.g. diffusers 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
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/16—Centrifugal pumps for displacing without appreciable compression
-
- 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
- F04D29/02—Selection of particular materials
- F04D29/023—Selection of particular materials 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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
Abstract
The invention discloses a rectifying structure of a multi-wing centrifugal fan for a compressor cooling system, which comprises a rectifying net arranged in the multi-wing centrifugal fan, wherein the diffuser outlet of the multi-wing centrifugal fan is connected with a heat exchanger, the rectifying net is arranged between the volute outlet and the diffuser outlet of the multi-wing centrifugal fan, a flow guide hole is formed in the rectifying net, and the total hole area of the flow guide hole is larger than the inlet area of the diffuser. According to the invention, the rectifying net with the total hole area larger than the diffuser inlet area is additionally arranged between the volute outlet and the diffuser outlet of the multi-wing centrifugal fan, so that secondary flow generated in the volute is basically eliminated, the vortex breaking effect is achieved, the condition that the local flow velocity is too large or too small after the airflow passes through the rectifying net is improved, the overall airflow is uniformly distributed, the heat exchange efficiency of the heat exchanger connected with the diffuser is greatly improved, and the heat exchange requirement of the heat exchanger is met on the premise of not increasing the air volume of the fan.
Description
Technical Field
The invention relates to the field of compressors, in particular to a rectifying structure of a multi-wing centrifugal fan for a compressor cooling system.
Background
The forward multi-wing centrifugal fan has many advantages such as large flow coefficient, high pressure coefficient and low noise, so that the forward multi-wing centrifugal fan is widely applied to a cooling system of an air compressor unit, and the multi-wing centrifugal fan gradually exposes the defects along with the continuous improvement of the requirements of high safety, high performance and the like of the air compressor unit. When the forward multi-wing centrifugal fan works, gas enters the impeller from the current collector and undergoes 2 process changes of radial-axial and axial-radial, the airflow is extremely unevenly distributed along the axial direction in the rapid turning process, airflow load is mainly inclined towards the vicinity of the rear disc, so that the airflow is mainly concentrated in the middle and the rear part of the impeller, and the airflow is relatively less at the part of the impeller close to the front disc; after the airflow enters the volute after being accelerated through the blade channel, because the speed near the rear disc is high, the flow speed near the front disc is low, the radial acting capacity of the blades is different along the axial direction to cause pressure difference, and the pressure difference causes that more serious secondary flow is generated inside the volute. The special work doing mode of the multi-wing centrifugal fan determines the condition that secondary flow can be generated in the volute; the secondary flow can be slightly reduced by improving the impeller structure and the collector part structure, but the secondary flow cannot be completely eliminated, and the secondary flow in the volute cannot be eliminated by adding the rectifying structure at the inlet of the fan.
The multi-wing centrifugal fan outlet is generally directly connected with the heat exchanger, the heat exchanger comprises an intercooler and an oil cooler, and under the general condition, the air flow at the outlet of the fan diffuser is generally considered to be uniformly distributed during the design of the heat exchanger, so that the cooling air quantity distributed by the intercooler and the oil cooler is considered to be in direct proportion to the respective areas of the intercooler and the oil cooler. However, due to the influence of secondary flow, the airflow at the outlet of the diffuser is severely unevenly distributed as shown in fig. 8, when the airflow at the outlet of the diffuser is unevenly distributed, the local flow rate is too high or too low, which has an important influence on the heat exchange efficiency at the outlet of the heat exchanger, when the cooling air volume of the oil cooler is insufficient, the service life of the lubricating oil is reduced, oxidation, carbonization or decomposition occurs, and when the cooling air volume of the oil cooler is excessive, the exhaust temperature is lower than the dew point temperature, water is separated out from the oil-gas mixture, so that the lubricating oil is emulsified; when the intercooler cooling is not enough, can put forward higher requirement for rear end drying capacity, when the intercooler cooling is excessive, the heat exchanger is easy to take place ice blocking phenomenon when the unit is operated at low temperature, has seriously influenced the use of heat exchanger.
Due to the existence of secondary flow, the air volume provided by the multi-wing centrifugal fan can not meet the heat exchange requirement of the heat exchanger, and if the air volume of the fan is greatly increased, the pneumatic noise of the fan is inevitably increased; the existing improvement of the multi-wing centrifugal fan can reduce the secondary flow in the volute, but the secondary flow cannot be completely eliminated, so that the problem to be solved is urgently needed.
Disclosure of Invention
In order to avoid and overcome the technical problems in the prior art, the invention provides the rectifying structure of the multi-wing centrifugal fan for the compressor cooling system, which basically eliminates secondary flow in the volute of the multi-wing centrifugal fan, achieves the vortex breaking effect, improves the condition that the local flow velocity is too large or too small after airflow passes through the rectifying net, has uniform overall airflow distribution, and meets the heat exchange requirement of a heat exchanger while not increasing the air volume of the fan.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a compressor cooling system is with multi-wing centrifugal fan's rectification structure, is including installing the rectifier network in multi-wing centrifugal fan, and multi-wing centrifugal fan's diffuser export links to each other with the heat exchanger, the rectifier network sets up between multi-wing centrifugal fan's spiral case export and diffuser export, seted up the water conservancy diversion hole on the rectifier network, the hole total area in water conservancy diversion hole is greater than the entry area of diffuser.
As a further scheme of the invention: the rectifier net body is protruded towards the outlet direction of the diffuser.
As a still further scheme of the invention: the net body of the rectifying net is arc tile-shaped, and the cross section of the rectifying net is arc-shaped.
As a still further scheme of the invention: the radius of the section arc of the rectification net body is R, the radius of the flow guide hole is R, and R is not less than 1/40R and not more than 1/24R.
As a still further scheme of the invention: the flow guide holes are arranged on the net surface of the rectifying net in an array shape; an included angle between the central lines of the adjacent flow guide holes along the convex direction of the rectifying net is n, wherein n is more than or equal to 3 degrees and less than or equal to 6 degrees; the distance between the central lines of the adjacent flow guide holes is d1，2r+1≤d1≤2r+3。
As a still further scheme of the invention: the central line of any one of the diversion holes is vertical to the section of the rectification net body where the diversion hole is located.
As a still further scheme of the invention: the rectifying net is in a wave shape or a taper shape with the tip facing the outlet direction of the diffuser.
As a still further scheme of the invention: the thickness of the rectification net is D, and D is more than or equal to 2mm and less than or equal to 4 mm.
As a still further scheme of the invention: the diffuser has a diffuser angle a of 45 °.
As a still further scheme of the invention: the rectifying net is made of metal or resin.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the rectifier net with the total hole area larger than the diffuser inlet area is additionally arranged between the volute outlet and the diffuser outlet of the multi-wing centrifugal fan, so that secondary flow generated in the volute is basically eliminated, a vortex breaking effect is achieved, the condition that the local flow velocity is too large or too small after the airflow passes through the rectifier net is improved, the overall airflow is uniformly distributed, the heat exchange efficiency of the heat exchanger connected with the diffuser is greatly improved, and the heat exchange requirement of the heat exchanger is met on the premise of not increasing the air volume of the fan.
2. The net body of the rectifying net is designed to be convex towards the outlet direction of the diffuser, and when the rectifying net is in an arc tile shape, compared with the existing rectifying structure, the rectifying net can eliminate 20% -30% of secondary flow; the market competitiveness of the product is improved, the air quantity of the fan does not need to be increased, and the energy-saving and environment-friendly effects are achieved.
3. The invention limits the range of the multi-parameter of the rectifier network, and the rectifier network can adapt to multi-wing centrifugal fans of different models by adjusting the parameters.
4. Besides the most preferable arc tile-shaped rectifying net, the rectifying net can also be designed into a wave shape or a taper shape with the tip facing the outlet direction of the diffuser, and the effect of eliminating partial secondary flow is also achieved.
Drawings
Fig. 1 is a schematic structural diagram of a multi-wing centrifugal fan with a rectifying structure.
Fig. 2 is an isometric view of a fairing structure.
Fig. 3 is a front view of the rectifying structure.
Fig. 4 is a side view of a fairing structure.
Fig. 5 is a schematic plan view of a multi-blade centrifugal fan with a fairing structure.
FIG. 6A is a graph of the streamline distribution in the diffuser without a rectifier net.
FIG. 6B is a graph of the streamline distribution in the diffuser with a rectifier network.
Fig. 7 is a schematic structural diagram of a multi-wing centrifugal fan with a rectifying structure after being connected with a heat exchanger.
FIG. 8 is a velocity profile at the outlet of a diffuser of a multi-winged centrifugal fan without a fairing.
Fig. 9 is a schematic view of the air flow spirally rising due to the secondary flow in the volute when the rectifying structure is not added.
In the figure: 1. a rectifier network; 2. a centrifugal fan; 21. a diffuser; 3. a gas cooler; 4. an oil cooler.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 9, in an embodiment of the present invention, a flow rectification structure of a centrifugal blower with multiple blades for a cooling system of a compressor includes a flow rectification net 1 fixed in a centrifugal blower with multiple blades 2, and the centrifugal blower with multiple blades 2 includes a collector, an impeller, a volute, and a diffuser 21. Wherein the diffuser 21 is connected to a heat exchanger, which here comprises a gas cooler 3 and an oil cooler 4. When the multi-wing centrifugal fan 2 works, airflow is sucked into the impeller along the radial direction of the impeller 2, then flows from the front disc to the rear disc along the axial direction of the impeller, finally enters the volute after being accelerated along the radial flow channel of the impeller, and enters the heat exchanger after passing through the volute and the diffuser 21 in sequence.
The rectifier network 1 is positioned between the outlet of the diffuser 21 and the volute outlet. The net body of the rectifier net 1 is provided with a diversion hole, and the net body is protruded towards the outlet direction of the diffuser 21 so as to ensure that the total hole area of the diversion hole is larger than the inlet area of the diffuser 21.
The specific shape of the rectifying net 1 is not limited, and the most preferable scheme is that the net body is arc tile-shaped, the cross section of the net body is arc-shaped, and the arc radius is R. The net body of the rectifier net is wavy or has a taper shape with the tip end facing the outlet direction of the diffuser 21, and partial effect of installing the rectifier net in an arc tile mode can also be achieved.
Take the rectification net 1 of arc tile form as an example, rectification net 1 fixed mode is unlimited, can select to have seted up the bolt hole on rectification net 1, fixes on multi-wing centrifugal fan 2 through the bolt. The material is preferably metal or resin material, and is preferably metal material; when the rectifier net is made of metal, a support can extend out of the rectifier net to fix the rectifier net.
The net body of the rectification net 1 is uniformly distributed with diversion holes, the central line of any diversion hole is vertical to the tangent plane of the rectification net body at the position of the diversion hole, the radius of the diversion hole is R, and R is not less than 1/40R and not more than 1/24R.
An included angle between the central lines of adjacent guide holes along the convex direction of the rectifying net 1 is n, wherein n is more than or equal to 3 degrees and less than or equal to 6 degrees; the distance between the central lines of the adjacent flow guide holes is d1，2r+1≤d1≤2r+3。
The effective coverage angle range theta of the rectification network 1 is 360-Ai; when r, n, Ai and aAfter the value is determined, the total hole area A of the diversion holes is pi (180-Ai)/n r2 (3L)4-L3)/2/d1. The length and width of the diffuser 21 at the inlet are L and L respectively3A > L.L3。
Taking L as 120mm, L3 as 250mm, diffuser diffusion angle as 45 degrees, R as 60mm, diversion hole radius R as 1/30 mm as 2mm, n as 4 degrees; most preferably, Ai is 160 °, and the effective coverage angle range θ of the rectification network 1 is 200 °; d is a radical of12r + 1-5 mm. After taking the above most preferable value for the ratio,
A＝π*(360°-Ai)/n*r2*(3L4-L3)/2/d1＝3.14*(360-160)/4*22*(3*310-250)/2/5＝42704mm2,A＞A0＝L·L3＝120*250＝30000mm2。
the numerical values are obtained by CFD trial calculation.
In addition, the rectifying net 1 has a certain thickness, the thickness D epsilon [2mm,4mm ], the value of D is preferably 2.5mm, and the rectifying effect is better as the value of D increases, but the corresponding friction loss also increases.
As shown in fig. 9, which is the gas flow spirally rising in the volute due to the secondary flow, the gas flow velocity distribution diagram in the diffuser 21 as shown in fig. 8 is generated due to the secondary flow, and it can be seen that the gas flow has too low flow velocity at the center of the diffuser 21 and too high flow velocity at the edge of the diffuser 21, and the gas flow distribution is severely uneven;
after the rectifying net 1 is added, as shown in fig. 6B, compared with fig. 6A without the rectifying net, the secondary flow in the volute can be reduced by more than 95%, the secondary flow in the volute is basically eliminated, and the air flow is uniformly distributed as a whole.
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 should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The utility model provides a compressor cooling system is with multi-wing centrifugal fan's rectification structure, its characterized in that, including installing rectification net (1) in multi-wing centrifugal fan (2), diffuser (21) export of multi-wing centrifugal fan (2) links to each other with the heat exchanger, rectification net (1) sets up between the spiral case export of multi-wing centrifugal fan (2) and diffuser (21) export, the water conservancy diversion hole has been seted up on rectification net (1), and the hole total area in water conservancy diversion hole is greater than the entry area of diffuser (21).
2. The rectifying structure of the centrifugal blower with multiple blades for the cooling system of compressor as claimed in claim 1, wherein the rectifying net (1) is convex towards the outlet of the diffuser (21).
3. The rectifying structure of the centrifugal blower with multiple blades for the cooling system of the compressor as claimed in claim 2, wherein the rectifying net (1) has a body in the shape of an arc tile and a cross section in the shape of an arc.
4. The rectifying structure of the centrifugal blower with multiple blades for the cooling system of compressor as claimed in claim 3, wherein the radius of the arc of section of the rectifying net (1) is R, and the radius of the diversion hole is R, 1/40R ≦ R ≦ 1/24R.
5. The flow-rectifying structure of the centrifugal fan with multiple wings for the cooling system of the compressor as claimed in claim 4, wherein the flow-guiding holes are arranged in an array on the net surface of the flow-rectifying net (1); along the protruding direction of the rectifying net (1), the included angle between the central lines of the adjacent flow guide holes is n, wherein n is more than or equal to 3 degrees and less than or equal to 6 degrees; the distance between the central lines of the adjacent flow guide holes is d1，2r+1mm≤d1≤2r+3mm。
6. The straightening structure of a centrifugal fan with multiple blades for a cooling system of a compressor according to any one of claims 3 to 5, wherein the center line of any one of the flow-guiding holes is perpendicular to the net body tangent plane of the straightening net (1) at the position of the flow-guiding hole.
7. The fairing structure of the centrifugal blower with multiple blades for the cooling system of compressor as claimed in claim 1, wherein the fairing net (1) is wavy or tapered with its tip facing the outlet of the diffuser (21).
8. The rectifying structure of the multi-wing centrifugal fan for the cooling system of the compressor as claimed in any one of claims 1 to 5, wherein the thickness of the rectifying net (1) is D, and D is more than or equal to 2mm and less than or equal to 4 mm.
9. The flow straightener structure of the centrifugal blower with multiple blades for cooling system of compressor as claimed in any one of claims 1 to 5, wherein the diffuser (21) has a diffuser angle a of 45 °.
10. The rectifying structure of the centrifugal blower with multiple blades for the cooling system of the compressor as claimed in any one of claims 1 to 5, wherein the rectifying net (1) is made of metal or resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110381803.6A CN113175446B (en) | 2021-04-09 | 2021-04-09 | Rectifying structure of multi-wing centrifugal fan for compressor cooling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110381803.6A CN113175446B (en) | 2021-04-09 | 2021-04-09 | Rectifying structure of multi-wing centrifugal fan for compressor cooling system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113175446A CN113175446A (en) | 2021-07-27 |
| CN113175446B true CN113175446B (en) | 2022-07-19 |
Family
ID=76924732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110381803.6A Active CN113175446B (en) | 2021-04-09 | 2021-04-09 | Rectifying structure of multi-wing centrifugal fan for compressor cooling system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113175446B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2155520Y (en) * | 1993-04-09 | 1994-02-09 | 北京康拓科技开发公司 | Sourceless noise-lowering device for room air conditioner |
| KR20010105611A (en) * | 2000-05-16 | 2001-11-29 | 구자홍 | Structure for sirocco fan diffuser of free standing type air conditioner |
| JP2008280939A (en) * | 2007-05-11 | 2008-11-20 | Mitsubishi Heavy Ind Ltd | Centrifugal blower |
| CN201582162U (en) * | 2010-01-06 | 2010-09-15 | 沈阳新松机器人自动化股份有限公司 | Modularized centrifugal speed-regulating flow-regulating fan for CO2 lasers |
| CN204186644U (en) * | 2014-10-02 | 2015-03-04 | 约克广州空调冷冻设备有限公司 | Multi-wing centrifugal fan system |
| CN105424309A (en) * | 2015-11-03 | 2016-03-23 | 南京航空航天大学 | Testing stand for dynamic airflow response in single/double duct mode switching process |
| CN109724127A (en) * | 2017-10-31 | 2019-05-07 | 宁波方太厨具有限公司 | A kind of range hood and its control method of quantity-adjustable |
| CN109891155A (en) * | 2016-10-31 | 2019-06-14 | 三菱电机株式会社 | Indoor unit and air-conditioning device |
-
2021
- 2021-04-09 CN CN202110381803.6A patent/CN113175446B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2155520Y (en) * | 1993-04-09 | 1994-02-09 | 北京康拓科技开发公司 | Sourceless noise-lowering device for room air conditioner |
| KR20010105611A (en) * | 2000-05-16 | 2001-11-29 | 구자홍 | Structure for sirocco fan diffuser of free standing type air conditioner |
| JP2008280939A (en) * | 2007-05-11 | 2008-11-20 | Mitsubishi Heavy Ind Ltd | Centrifugal blower |
| CN201582162U (en) * | 2010-01-06 | 2010-09-15 | 沈阳新松机器人自动化股份有限公司 | Modularized centrifugal speed-regulating flow-regulating fan for CO2 lasers |
| CN204186644U (en) * | 2014-10-02 | 2015-03-04 | 约克广州空调冷冻设备有限公司 | Multi-wing centrifugal fan system |
| CN105424309A (en) * | 2015-11-03 | 2016-03-23 | 南京航空航天大学 | Testing stand for dynamic airflow response in single/double duct mode switching process |
| CN109891155A (en) * | 2016-10-31 | 2019-06-14 | 三菱电机株式会社 | Indoor unit and air-conditioning device |
| CN109724127A (en) * | 2017-10-31 | 2019-05-07 | 宁波方太厨具有限公司 | A kind of range hood and its control method of quantity-adjustable |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113175446A (en) | 2021-07-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104632700B (en) | Dual-impeller device of centrifugal blower | |
| CN108953223B (en) | Centrifugal impeller | |
| CN113175446B (en) | Rectifying structure of multi-wing centrifugal fan for compressor cooling system | |
| CN204610372U (en) | A kind of centrifugal impeller of blade trailing edge band winglet | |
| CN112648230A (en) | High-efficient anti cavitation centrifugal pump impeller | |
| CN112283154A (en) | Axial flow fan blade and air conditioner | |
| CN104632699B (en) | A kind of centrifugal fan bilobed wheel | |
| CN218522841U (en) | Cross-flow fan blade and air conditioner | |
| CN113446237B (en) | Centrifugal ventilator with semi-open type ternary impeller | |
| CN211737550U (en) | Backward centrifugal cross-section noise reduction type centrifugal fan blade | |
| CN213839013U (en) | Axial flow fan blade and air conditioner | |
| CN201963595U (en) | Centrifugal front or rear impeller of non-separated flow subcritical blade profile | |
| CN215214091U (en) | Centrifugal fan impeller and centrifugal fan and air purifier with same | |
| CN209943142U (en) | Efficient flow-protecting channel centrifugal fan | |
| CN108953222B (en) | Centrifugal impeller | |
| CN214274041U (en) | Fan blade, centrifugal fan and clothes treatment device | |
| CN214304518U (en) | Closed type medium-flow high-pressure three-dimensional flow impeller for coal pulverizing and discharging fan of iron works | |
| CN211314639U (en) | Cross-flow fan blade and air conditioner with same | |
| CN114856717B (en) | Novel exhaust diffuser structure with splitter plate capable of enhancing aerodynamic performance | |
| CN213744130U (en) | Impeller, centrifugal compressor and air conditioner | |
| CN217440358U (en) | Blade, impeller and ventilation equipment | |
| CN212130876U (en) | High-pressure centrifugal fan impeller | |
| CN217354881U (en) | Energy-saving and consumption-reducing auxiliary blade structure of centrifugal ventilator | |
| CN218915112U (en) | Diversion structure and raise boring machine with same | |
| CN203362609U (en) | Front disc and fan impeller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |