CN110425157B - Efficient gas mixing centrifugal fan - Google Patents
Efficient gas mixing centrifugal fan Download PDFInfo
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- CN110425157B CN110425157B CN201910829710.8A CN201910829710A CN110425157B CN 110425157 B CN110425157 B CN 110425157B CN 201910829710 A CN201910829710 A CN 201910829710A CN 110425157 B CN110425157 B CN 110425157B
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- 230000008859 change Effects 0.000 claims description 10
- 230000007704 transition Effects 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000012545 processing Methods 0.000 abstract description 3
- 210000002105 tongue Anatomy 0.000 description 23
- 230000003068 static effect Effects 0.000 description 4
- 230000006872 improvement Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
-
- 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
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/422—Discharge tongues
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
- F04D29/4233—Fan casings with volutes extending mainly in axial or radially inward direction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—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
- F04D29/663—Sound attenuation
-
- 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
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 high-efficiency gas mixing centrifugal fan which comprises a cover plate, a volute and a centrifugal impeller. The centrifugal impeller is arranged in the volute; the volute has a spiral flow path part surrounding the centrifugal impeller, and a throat part communicated with the spiral flow path part; the cross section of the spiral flow passage part along the air flow direction gradually becomes larger, and the air outlet passage of the throat part has a divergence angle. The invention adopts the special spiral flow passage part and the throat part design, has the advantages of simple structure and low processing difficulty, optimizes the flow of air flow in the impeller channel, improves the overall pneumatic stability and efficiency of the centrifugal fan, and ensures that the centrifugal fan has higher reliability and economy.
Description
Technical Field
The invention relates to the field of centrifugal fans, in particular to a high-efficiency type air mixing centrifugal fan.
Background
The gas mixing centrifugal fan has the advantages of compact structure, large gas mixing flow coefficient, high pressure rise coefficient and the like, and is widely used for industrial boilers and household wall-mounted furnaces; along with the improvement of the life quality of people and the improvement of the requirements of industry on household appliance standards and equipment standards, the efficient, stable and compact centrifugal fan has become a main development direction and pursuit goal.
The existing centrifugal fans mostly adopt a backward wind wheel design. The centrifugal fan wind wheel has the function that the blades are used for converting air flow from axial air inlet into radial air outlet, and the blades of the centrifugal fan are generally designed by adopting a backward wind wheel due to the reasons of low pressure ratio, simple structure, convenient processing, high through flow and the like of the centrifugal fan, and the blades of the centrifugal section are backward bent blades. The design scheme is convenient to develop, process and manufacture, improves the overall efficiency of the fan, and has the problems that the air flow axially turns into radial flow, the air flow does not pass through any internal mixing of blades, and the combustible gas and the air are easily not completely mixed, so that the gas provided by the fan to a boiler cannot be fully combusted, the gas mixing stability of the centrifugal fan is influenced, and in addition, the density of the gas sent out by the fan after the gas mixing is uneven, so that the efficiency of the centrifugal fan is reduced.
The main components of the centrifugal fan comprise a volute part besides the impeller, and the volute part is used for collecting airflow at the inlet of the impeller and providing mixed airflow and a certain pressure rise at the outlet. The conventional volute tongue is designed into four forms, namely a long tongue, a flat tongue, a sharp tongue and a short tongue, wherein the long tongue, the short tongue and the sharp tongue are collectively called as a tongue, the efficiency of the centrifugal fan is greatly improved when the tongue exists, the pressure is increased, the influence of the volute tongue on the performance of the centrifugal fan is gradually reduced along with the increase of the specific rotation speed, the disadvantage is that the noise is larger, the flat tongue is also called as no tongue, the advantage of the centrifugal fan when the tongue does not exist is that the noise is lower, and the disadvantage is that the power consumption is large and the efficiency is low. In addition, the section of the outlet of the volute is increased, the static pressure of the centrifugal fan is increased, but the outlet speed is still too high in most cases, and the airflow backflow can occur at the position of the outlet of the centrifugal fan close to the volute tongue, so that the overall performance of the fan is reduced.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art, and provides a high-efficiency gas mixing design centrifugal fan, which aims to realize smooth guiding of air flow at an outlet in the centrifugal fan by adopting a simple structure, so that the centrifugal fan has higher efficiency, more stable working characteristics and more compact appearance, and has more advantages compared with similar products.
The technical scheme adopted for solving the technical problems is as follows: a high-efficiency gas-mixing centrifugal fan comprises a cover plate, a volute and a centrifugal impeller. The centrifugal impeller is arranged in the volute; the volute has a spiral flow path part surrounding the centrifugal impeller, and a throat part communicated with the spiral flow path part; the cross section of the spiral flow passage part along the air flow direction gradually becomes larger, and the air outlet passage of the throat part has a divergence angle.
In order to optimize the technical scheme, the invention further comprises the following improved technical scheme.
The centrifugal impeller is a forward impeller, the centrifugal impeller is equidistantly arranged along the bending direction of the blades, the number of the centrifugal impeller is 9 to 23, the thickness of the blades is 1.1 to 1.3mm, and the ratio of the blade profile height of the air inlet to the blade profile height of the air outlet is 1.3 to 1.4.
Both ends of the spiral flow path part are provided with a section FP and an outlet section BA; the cross section gradual change section FA is formed from the cross section FP to the outlet cross section BA, and the ratio of the area R2 of any cross section in the cross section gradual change section FA to the area R1 of the cross section BA is 0.86 to 1.
The line connecting the center OF the smallest section FP and the center OF the axis in the section gradual change section FA is a straight line OF, and the line connecting the center OF the section AB and the center OF the axis is a straight line OA; the straight line OF and the straight line OA form an included angle FOA, and the included angle FOA is 50 ° to 95 °.
The junction OF the throat part and the spiral flow passage part is provided with a section HE and a section FG, the intersection point I and O between the section HE and the section FG form a connecting line OI, the straight line OF and the connecting line OI form an included angle FOI, and the included angle FOI is 8-15 degrees.
The angle of the expansion angle is an included angle formed by the EI extension line and the CA extension line, and the angle of the expansion angle is 2.2 degrees to 3.4 degrees.
The cover plate is provided with an air inlet, and the area ratio of the section of the air inlet to the section of the air outlet of the throat part is 1.1-1.9.
Compared with the prior art, the invention has the following advantages:
1. the spiral case adopts the special spiral flow passage part and the throat part design, has the advantages of simple structure and low processing difficulty, optimizes the flow of air flow in the impeller channel, improves the overall pneumatic stability and efficiency of the centrifugal fan, and ensures that the centrifugal fan has higher reliability and economy;
2. the integral structure size of the centrifugal fan is optimized, so that the centrifugal fan is more compact, and the application range of the centrifugal fan is increased.
Drawings
Fig. 1 is a schematic cross-sectional structure of a centrifugal fan according to an embodiment of the invention.
Fig. 2 is a cross-sectional view taken along A-A of fig. 1.
FIG. 3 is a schematic view of a cross-sectional structure of an air inlet.
Fig. 4 is a schematic diagram of a cross-sectional structure of the air outlet.
Fig. 5 is a schematic view of a volute structure.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
The invention relates to a high-efficiency air-mixing tongue-mixing fan which mainly comprises a cover plate 1, a volute casing 2, a spiral runner part 2a, a throat part 2b, a centrifugal impeller 3, an air inlet section 4 and an air outlet section 5.
The invention relates to a high-efficiency gas mixing centrifugal fan which comprises a cover plate 1, a volute 2 and a centrifugal impeller 3. The centrifugal impeller 3 is mounted inside the volute 2. The scroll casing 2 has a spiral flow path portion 2a surrounding the centrifugal impeller 3, and a throat portion 2b communicating with the spiral flow path portion 2 a. The cross section of the spiral flow passage part 2a gradually increases along the air flow direction, and the air outlet passage of the throat part 2b has a widening angle.
The centrifugal impellers 3 are forward impellers and are equidistantly arranged along the bending direction of the blades, the number of the centrifugal impellers is 9 to 23, the thickness of the blades is 1.1 to 1.3mm, and the ratio of the blade profile height of the air inlet to the blade profile height of the air outlet is 1.3 to 1.4. In this embodiment, the number of blades is preferably 18, the thickness of the blades is 1.2mm, and the ratio of the vane profile height of the air inlet to the vane profile height of the air outlet is 1.35. The number of the blades can be 16, 17 and 19, and the thickness of the blades can be 1.1mm or 1.3mm.
The existing impeller generally adopts a straight blade design, the front edge line of the straight blade is parallel to the axial direction, the total pressure of all meridian lines of the inlet is basically equal, the radial velocity of blade root airflow of the centrifugal fan inlet is lower than that of blade tip of the centrifugal fan inlet, and the straight blade design inevitably leads to incomplete adaptation of the angle of the straight blade and the angle of the airflow along the high direction of the blade because the rotation linear velocity of the blade root airflow of the centrifugal fan inlet is the same under the same radius, and the airflows along the high direction of the blade can be mutually mixed, so that energy loss is caused. The invention adopts the forward blade profile and is matched with the design of the throat part 2b of the volute 2, so that the windward side can be used for more effectively mixing gas, and the gas flow can be prevented from flowing back along the radial direction, thereby improving the flowing state at the outlet of the volute 2.
Both ends of the spiral gate 2a have a cross section FP and an outlet cross section BA. The cross section gradual change section FA is formed from the cross section FP to the outlet cross section BA, and the ratio of the area R2 of any cross section in the cross section gradual change section FA to the area R1 of the cross section BA is 0.86 to 1. Wherein the area value of the cross section FP is the smallest and the ratio of the cross section FP to the cross section BA is 0.86. The area R2 of any one of the sections of the section transition section FA becomes gradually larger in the air-out direction.
The line connecting the center OF the smallest section FP in the section transition FA with the center OF the axis is a straight line OF, and the line connecting the center OF the section AB with the center OF the axis is a straight line OA. The straight line OF and the straight line OA form an included angle FOA, and the included angle FOA is 50 ° to 95 °. The angle FOA is preferably between 55 ° and 80 °, in this embodiment about 60 °.
The conventional centrifugal fan mostly adopts a short tongue and a deep tongue design, the short tongue is mostly used for the centrifugal fan with high specific speed, the efficiency curve is flat, the reasonable working area is larger, the noise is large, the deep tongue is mostly used for the centrifugal fan with low specific speed, the deeper the deep tongue is, the smaller the gap between the deep tongue and the outlet of the impeller is, the smaller the leakage amount between the spiral part of the volute and the outlet of the volute is, which is beneficial to improving the efficiency and the pressure of the fan, but the noise is increased, the efficiency curve is steep, and the reasonable working area is smaller. Aiming at the defects of the two existing volute tongues, the volute casing 2 is provided with the throat part 2b, the throat part 2b comprises the volute tongue FG and the arc HG, the efficiency and the pressure of the fan can be improved, the noise is reduced, and the reasonable working range is larger.
The junction OF the throat portion 2b and the spiral flow path portion 2a has a cross section HE and a cross section FG, and the intersection point I and O between the cross section HE and the cross section FG form a line OI, and the line OF and the line OI form an included angle FOI, the included angle FOI being 8 ° to 15 °.
The angle of divergence is the included angle formed by the EI extension line and the CA extension line, and the angle of divergence is 2.2 degrees to 3.4 degrees.
As shown in fig. 3, the cover plate 1 has an air inlet, and the area ratio of the air inlet section 4 to the air outlet section 5 of the throat part 2b is 1.1 to 1.9. As shown in fig. 4 and 5, the centrifugal gradual change section LK of the air outlet and the arc LNMJ are in smooth transition, the expansion angle of the outlet is 2.2-3.4 degrees, and the inner side wall of the expander is inclined towards the rotation direction of the impeller, so that part of dynamic pressure can be converted into static pressure, and the static pressure and static pressure efficiency of the ventilator can be improved.
The preferred embodiments of this invention have been described so far that various changes or modifications may be made by one of ordinary skill in the art without departing from the scope of this invention.
Claims (3)
1. The utility model provides a high-efficient formula gas mixing centrifugal fan, includes apron (1), spiral case (2), centrifugal impeller (3), characterized by: the centrifugal impeller (3) is arranged in the volute (2); the volute (2) is provided with a spiral flow passage part (2 a) surrounding the centrifugal impeller (3) and a throat part (2 b) communicated with the spiral flow passage part (2 a); the cross section of the spiral flow passage part (2 a) is gradually enlarged along the air flow direction, and the air outlet passage of the throat part (2 b) is provided with a widening angle; the centrifugal impellers (3) are forward impellers, the centrifugal impellers are equidistantly arranged along the bending direction of the blades, the number of the centrifugal impellers is 9 to 23, the thickness of the blades is 1.1 to 1.3mm, and the ratio of the blade profile height of the air inlet to the blade profile height of the air outlet is 1.3 to 1.4; both ends of the spiral flow path part (2 a) have a section FP and an outlet section BA; a section gradual change section FA is formed from the section FP to the outlet section BA, and the ratio of the area R2 of any section in the section gradual change section FA to the area R1 of the section BA is 0.86 to 1; the junction OF the throat part (2 b) and the spiral flow passage part (2 a) is provided with a section HE and a section FG, an intersection point I and an intersection point O between the section HE and the section FG form a connecting line OI, a straight line OF and the connecting line OI form an included angle FOI, and the included angle FOI is 8-15 degrees; the cover plate (1) is provided with an air inlet, and the area ratio of the air inlet section (4) to the air outlet section (5) of the throat part (2 b) is 1.1-1.9; the centrifugal gradual change section LK of the air outlet and the arc LNMJ are in smooth transition, the expansion angle of the outlet is 2.2-3.4 degrees, and the inner side wall of the expander is inclined to the rotation direction of the impeller.
2. The efficient air-mixing centrifugal fan according to claim 1, characterized in that: the connecting line between the center OF the minimum section FP and the center OF the axis in the section gradual change section FA is a straight line OF, and the connecting line between the center OF the section AB and the center OF the axis is a straight line OA; the straight line OF and the straight line OA form an included angle FOA OF 50 ° to 95 °.
3. The efficient air-mixing centrifugal fan according to claim 1, characterized in that: the angle of the expansion angle is an included angle formed by an EI extension line and a CA extension line, and the angle of the expansion angle is 2.2-3.4 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910829710.8A CN110425157B (en) | 2019-09-04 | 2019-09-04 | Efficient gas mixing centrifugal fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910829710.8A CN110425157B (en) | 2019-09-04 | 2019-09-04 | Efficient gas mixing centrifugal fan |
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| Publication Number | Publication Date |
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| CN110425157A CN110425157A (en) | 2019-11-08 |
| CN110425157B true CN110425157B (en) | 2023-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910829710.8A Active CN110425157B (en) | 2019-09-04 | 2019-09-04 | Efficient gas mixing centrifugal fan |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116241508B (en) * | 2023-05-12 | 2023-09-15 | 潍柴动力股份有限公司 | Air outlet pipe of air compressor, air compressor and engine |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6254336B1 (en) * | 1998-01-20 | 2001-07-03 | Lg Electronics, Inc. | Sirocco fan having an inclined cutoff |
| CN104454648A (en) * | 2013-09-24 | 2015-03-25 | 珠海格力电器股份有限公司 | Volute, low-noise centrifugal fan and air conditioner |
| CN104806571A (en) * | 2015-04-28 | 2015-07-29 | 湖南科技大学 | Efficient centrifugal air blower based on computational fluid dynamic simulation |
| CN207315729U (en) * | 2017-11-01 | 2018-05-04 | 杭州老板电器股份有限公司 | Impeller, centrifugal blower and kitchen ventilator |
| CN108138785A (en) * | 2015-07-17 | 2018-06-08 | 加德纳·丹佛德国股份有限公司 | There is the side channel machine (compressor, vacuum pump or fan) of extraction tube in stripper |
| CN207647842U (en) * | 2017-12-28 | 2018-07-24 | 宁波方太厨具有限公司 | A kind of volute structure of centrifugal blower |
| CN108612674A (en) * | 2018-03-22 | 2018-10-02 | 海信科龙电器股份有限公司 | A kind of centrifugal blower and air conditioner |
| CN109973438A (en) * | 2019-04-24 | 2019-07-05 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute |
| CN109989926A (en) * | 2019-03-28 | 2019-07-09 | 宁波纽新克电机股份有限公司 | A kind of efficient guarantor's runner centrifugal blower |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2799334B1 (en) * | 2013-04-29 | 2016-09-07 | AIRBUS HELICOPTERS DEUTSCHLAND GmbH | Blade rotary assembly with aerodynamic outer toroid spoiler for a shrouded propulsion rotary assembly |
-
2019
- 2019-09-04 CN CN201910829710.8A patent/CN110425157B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6254336B1 (en) * | 1998-01-20 | 2001-07-03 | Lg Electronics, Inc. | Sirocco fan having an inclined cutoff |
| CN104454648A (en) * | 2013-09-24 | 2015-03-25 | 珠海格力电器股份有限公司 | Volute, low-noise centrifugal fan and air conditioner |
| CN104806571A (en) * | 2015-04-28 | 2015-07-29 | 湖南科技大学 | Efficient centrifugal air blower based on computational fluid dynamic simulation |
| CN108138785A (en) * | 2015-07-17 | 2018-06-08 | 加德纳·丹佛德国股份有限公司 | There is the side channel machine (compressor, vacuum pump or fan) of extraction tube in stripper |
| CN207315729U (en) * | 2017-11-01 | 2018-05-04 | 杭州老板电器股份有限公司 | Impeller, centrifugal blower and kitchen ventilator |
| CN207647842U (en) * | 2017-12-28 | 2018-07-24 | 宁波方太厨具有限公司 | A kind of volute structure of centrifugal blower |
| CN108612674A (en) * | 2018-03-22 | 2018-10-02 | 海信科龙电器股份有限公司 | A kind of centrifugal blower and air conditioner |
| CN109989926A (en) * | 2019-03-28 | 2019-07-09 | 宁波纽新克电机股份有限公司 | A kind of efficient guarantor's runner centrifugal blower |
| CN109973438A (en) * | 2019-04-24 | 2019-07-05 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute |
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| CN110425157A (en) | 2019-11-08 |
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