CN101184922A - Centrifugal blower and air conditioner using the same - Google Patents

Centrifugal blower and air conditioner using the same Download PDF

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Publication number
CN101184922A
CN101184922A CNA2006800182060A CN200680018206A CN101184922A CN 101184922 A CN101184922 A CN 101184922A CN A2006800182060 A CNA2006800182060 A CN A2006800182060A CN 200680018206 A CN200680018206 A CN 200680018206A CN 101184922 A CN101184922 A CN 101184922A
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CN
China
Prior art keywords
centrifugal blower
mainboard
cover
blade
thickness
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CNA2006800182060A
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Chinese (zh)
Inventor
冈田觉
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Toshiba Carrier Corp
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Toshiba Carrier Corp
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Filing date
Publication date
Application filed by Toshiba Carrier Corp filed Critical Toshiba Carrier Corp
Publication of CN101184922A publication Critical patent/CN101184922A/en
Pending legal-status Critical Current

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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
    • F04D29/26—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
    • 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
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/303—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the leading edge of a rotor blade

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Air-Conditioning Room Units, And Self-Contained Units In General (AREA)

Abstract

A centrifugal blower having a bladed wheel with blades arranged between a shroud and a main plate. A shroud-side end section on the front edge side of a blade is formed into a curved surface, and the centrifugal blower satisfies R1 < R2,whereR1 isthe curvature radius on the positive pressure side of the curved end section, and R2 is the curvature radius on the negative pressure side.

Description

Centrifugal blower and use the air conditioner of this gas fan
Technical field
The present invention relates to a kind of centrifugal blower and air conditioner, relate in particular to gas fan that has improved blade inlet edge and cover side shape and the air conditioner that uses this gas fan.
Background technique
Generally in ceiling cassette type air conditioner etc., turbofan is installed mostly.This air conditioner has the open housing in underpart, and the central part in this housing is equipped with the electric centrifugal-type gas fan.This centrifugal blower has impeller, and is provided with heat exchanger around centrifugal blower.
Described impeller comprises: have the cover of the mainboard of the projection that is provided with the motor shaft erection opening, relative configuration with this mainboard and be located at a plurality of blades between this cover and the mainboard.This centrifugal blower generally exists noise level height, problem that fan efficiency is low.
Therefore, proposed to have improved length of blade and blade pitgh etc. configuration, realized low noise, the centrifugal blower (the Japan Patent spy opens the 2003-279061 communique) that efficient is high.Yet, open in the technology that the 2003-279061 communique put down in writing the Japan Patent spy, as Fig. 9 and shown in Figure 10, the cover side end of the blade inlet edge 31a side of blade 31 is that the shape of R portion (curved surface shape end) forms positive radius of curvature R of pressing side 3Radius of curvature R with the suction surface side 4Equate (R 3=R 4), the air that is inhaled into is at suction surface lateral lobe sheet front end (R 4Part) break away from, the disengaging of suction surface side increases, so fan efficiency is low.
In addition, also having proposed a kind of is the impeller of purpose centrifugal blower with low noise, high efficiency, in this impeller, with the thickness of all or part of blade of impeller form from cover to mainboard gradually thickening, make each blade blade each other at interval from cover to mainboard narrow down gradually (the Japan Patent spy opens the 2001-132687 communique).Yet in the technology that this communique is put down in writing, the main flow of air is that the blade interval each other of mainboard side shortens, and the inflow area of air causes air quantity to descend less than the cover side.
Summary of the invention
In view of the above problems, the object of the present invention is to provide the high centrifugal blower of a kind of fan efficiency.
In addition, the present invention also aims to provide a kind of high efficiency air conditioner that has used the high centrifugal blower of fan efficiency.
To achieve these goals, centrifugal blower of the present invention, it is characterized in that, has impeller, this impeller comprises: have the cover of the mainboard of the projection that is provided with the motor shaft erection opening, relative configuration with this mainboard and be located at this cover and described mainboard between a plurality of blades, the cover side end of described blade inlet edge side forms the curved surface shape, and is made as R in the radius of curvature with the pressure surface side of this curved surface shape end 1, the radius of curvature of suction surface side is made as R 2The time, satisfy R 1＜R 2Relation.
In addition, when the thickness with described blade is made as t, also can be R 1＜R 2The relation of＜t.
Moreover in described centrifugal blower, the thickness that makes blade integral is thickening gradually from mainboard side towards the cover side, and mainboard side thickness is being made as t 1, cover side thickness is made as t 2The time, also can be 1＜t 2/ t 1≤ 1.7.
Moreover, air conditioner of the present invention, it is characterized in that, the heat exchanger that comprises centrifugal blower and be configured in the peripheral part of this centrifugal blower, described centrifugal blower has impeller, and this impeller comprises: have the cover of the mainboard of the projection that is provided with the motor shaft erection opening, relative configuration with this mainboard and be located at this cover and described mainboard between a plurality of blades.
Adopt centrifugal blower of the present invention, can provide fan efficiency high centrifugal blower.In addition, also can provide the high efficiency air conditioner that uses the high centrifugal blower of this fan efficiency.
Description of drawings
Fig. 1 is the longitudinal section of air conditioner of the present invention.
Fig. 2 is the plan view of the impeller that uses in centrifugal blower of the present invention.
Fig. 3 is the longitudinal section along the impeller of the III-III line of Fig. 2.
Fig. 4 is the schematic representation of cover side end that is illustrated in the front edge side of the blade that uses in the centrifugal blower of the present invention.
Fig. 5 is the stereogram of the blade that uses in centrifugal blower of the present invention.
Fig. 6 is the schematic representation that is illustrated in the blade air stream in use that uses in the centrifugal blower of the present invention.
Fig. 7 has been to use the static pressure of centrifugal blower of the present invention, the figure as a result of fan efficiency determination test.
Fig. 8 be to use centrifugal blower of the present invention blade thickness than and the figure as a result of static pressure ratio determination test.
Fig. 9 is the schematic representation that is illustrated in the front end of the blade that uses in the existing centrifugal blower.
Figure 10 is the schematic representation that is illustrated in the blade air stream in use that uses in the centrifugal blower of the present invention.
Embodiment
Air conditioner to the present invention's one example describes with reference to the accompanying drawings.
In addition, in the record below, about the expression, about etc. the term of direction in the reference accompanying drawing or according to the installment state of reality, use.
As shown in Figure 1, air conditioner 1 of the present invention is the ceiling cassette type air conditioner for example, has the open housing 2 in underpart, is provided with the centrifugal blower 20 that is made of fan motor 3 and impeller 21 in this housing 2.That is, by motor base 4 fan motor 3 is installed, impeller 21 is installed in the rotating shaft of this fan motor 3 at the central part of the upper base of this housing 2.
In addition, be provided with suction cone 5, dispose drainage tray (drain pan) 6, dispose heat exchanger 7 with the form of surrounding this centrifugal blower 20 at an upper portion thereof at the peripheral part of this suction cone 5 in the bottom of this centrifugal blower 20.The open end, bottom of suction cone 5 constitutes the suction port of air, at this filter 8 is installed.The outside of heat exchanger 7 constitutes air-supply path 10, and its lower surface portion constitutes relief opening 11.Moreover, the front panel 12 of frame shape is installed at the opening portion of air conditioner housing.Air conditioner 1 utilizes suspensions such as accessory 13 to be fixed on Liang Dengshang.
As shown in Figures 2 and 3, described impeller 21 comprises: mainboard 24 has projection 22 that is provided with the motor shaft erection opening and the wheel hub 23 that is located at these projection 22 peripheral parts; A plurality of blades 25 are along the circumferencial direction setting of this mainboard 24; And cover 26, this cover 26 clips blade 25 and mainboard 24 relative configurations.
As shown in Figures 3 and 4, be the shape of R portion (curved surface shape end) for the cover side end of the leading edge 25a side of blade 25, be made as R in radius of curvature with pressure surface 25b side 1, the radius of curvature of suction surface 25c side is made as R 2, when the thickness of blade 25 is made as t, sets the whole zone of cover side end for, be to satisfy R in the whole zone, suction side in the leading edge 25a of blade 25 side 1＜R 2The relation of＜t.
By such formation, as Fig. 4 and shown in Figure 6, inhaled air is at the suction surface side end (R of blade 25 2Portion) disengaging reduces, and is suppressed in the disengaging of the suction surface 25c of blade 25 side, and as shown in Figure 7, static pressure increases, and fan efficiency improves.The fan efficiency in especially big air quantity (high rotating speed) zone improves, and can enlarge the fan running scope.
In addition, as shown in Figure 5, the thickness of blade 25 integral body is made as t from mainboard 24 side direction covers 26 sides thickening gradually at the thickness with mainboard side 1, the thickness of cover side is made as t 2The time, set for and satisfy 1＜t 2/ t 1≤ 1.7 relation.Especially preferably 1＜t 2/ t 1≤ 1.5.Thus, blade 25 at each other interval of the blade of mainboard 24 sides of the main flow that constitutes wind, promptly be positioned at the place ahead blade suction surface and be positioned at interval between the pressure surface of blade at rear greater than the blade interval each other of cover 26 sides.Consequently, the air of mainboard 24 sides flows into the air inflow area of area greater than cover 26 sides, and the inflow impedance of mainboard 24 sides of the main flow that constitutes wind is reduced, and air quantity is increased.Moreover the inflow area of cover 26 sides that break away from diminishes easily, can reduce the disengaging of cover 26 sides.
Thus, as shown in Figure 8, the inflow of air stream becomes smooth and easy, and static pressure increases, and fan efficiency improves.
Below the air conditioning effect of air conditioner of the present invention and the air-supply effect of centrifugal blower of the present invention are described.
As shown in Figure 1, if to fan motor 3 energising, then centrifugal blower 20 rotations, indoor air is inhaled into along the arrow A direction, and heat exchanger 7 in heat exchange after discharge along the arrow B direction by blow path 10 and relief opening 11.Thus, carrying out indoor air by the ceiling cassette type air conditioner regulates.
In this air conditioning process, be subjected to blade 25 application of forces by suction cone 5 inhaled airs, air-supply outside impeller 21 after increasing flow velocity.In addition, in this air-supply process, as shown in Figure 4,, be made as R in radius of curvature with pressure surface 25b side owing to be the shape of R portion (curved surface shape end) for the cover side end of the leading edge 25a side of blade 25 1, the radius of curvature of suction surface 25c side is made as R 2, when the thickness of blade 25 is made as t, in whole zone, suction side, satisfy R 1＜R 2The relation of＜t, therefore, the static pressure in especially big air quantity (high rotating speed) zone increases and fan efficiency improves, and can enlarge the fan running scope.
In addition, as shown in Figure 5, because the thickness of blade 25 integral body is made as t from mainboard 24 side direction covers 26 sides thickening gradually at the thickness with mainboard side 1, the thickness of cover side is made as t 2The time, satisfy 1＜t 2/ t 1Therefore≤1.7 relation can make the inflow impedance of mainboard 24 sides of the main flow that constitutes wind reduce, and air quantity is increased.Moreover, as shown in Figure 6, can reduce disengaging significantly in the suction surface side of the cover 26 that breaks away from easily.Thus, the inflow of air stream becomes smooth and easy, and static pressure increases, and fan efficiency improves.
Thus, packed into the efficient of air conditioner of the present invention of the high centrifugal blower of aforesaid fan efficiency also uprises.
Embodiment
Test 1: use the centrifugal blower (embodiment 1) of blade and centrifugal blower (conventional example 1), the relation of static pressure and air quantity, air quantity and efficient is studied with blade of shape shown in Figure 9 with shape shown in Figure 4.
The result is as shown in Figure 7: compare with conventional example 1, in embodiment 1, the air quantity under the identical static pressure increases, and in addition, under identical air quantity, embodiment 1 efficient is higher than conventional example 1.
Test 2: use the thickness that makes blade 25 shown in Figure 5 from mainboard 24 side direction covers 26 sides gradually the centrifugal blower of thickening (embodiment 2) and the thickness that makes blade 25 in contrast from cover 26 sides towards mainboard 24 sides the centrifugal blower of thickening (conventional example 2) gradually, to the thickness t of mainboard side 1Thickness t with the cover side 2Ratio t 2/ t 1Study with the relation of static pressure ratio.
The result as shown in Figure 8.Embodiment 2 is at t 2/ t 1Be to bring up to roughly 101.3% with respect to embodiment 2 static pressure in 1～1.5 the scope, in 1～1.7 scope, also surpassed 100%.
Adopt centrifugal blower of the present invention, can provide fan efficiency high centrifugal blower.In addition, also can provide the high efficiency air conditioner that has used the high centrifugal blower of this fan efficiency.

Claims (4)

1. centrifugal blower, it is characterized in that, has impeller, this impeller comprises: have the cover of the mainboard of the projection that is provided with the motor shaft erection opening, relative configuration with this mainboard and be located at this cover and described mainboard between a plurality of blades, the cover side end of described blade inlet edge side forms the curved surface shape, and is made as R in the radius of curvature with the pressure surface side of this curved surface shape end 1, the radius of curvature of suction surface side is made as R 2The time, satisfy R 1＜R 2Relation.
2. centrifugal blower as claimed in claim 1 is characterized in that, when the thickness with described blade is made as t, satisfies R 1＜R 2The relation of＜t.
3. centrifugal blower as claimed in claim 1 is characterized in that, the thickness that makes described blade integral is thickening gradually from mainboard side towards the cover side, and mainboard side thickness is being made as t 1, cover side thickness is made as t 2The time, make 1＜t 2/ t 1≤ 1.7.
4. air conditioner, it is characterized in that, the heat exchanger that comprises centrifugal blower and be configured in the peripheral part of this centrifugal blower, described centrifugal blower has impeller, and this impeller comprises: have the cover of the mainboard of the projection that is provided with the motor shaft erection opening, relative configuration with this mainboard and be located at this cover and described mainboard between a plurality of blades.
CNA2006800182060A 2005-05-26 2006-05-15 Centrifugal blower and air conditioner using the same Pending CN101184922A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP154299/2005 2005-05-26
JP2005154299 2005-05-26

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CN101184922A true CN101184922A (en) 2008-05-21

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EP (1) EP1887227A1 (en)
JP (1) JP4693842B2 (en)
KR (1) KR100917091B1 (en)
CN (1) CN101184922A (en)
WO (1) WO2006126408A1 (en)

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Publication number Priority date Publication date Assignee Title
JPWO2008093390A1 (en) * 2007-01-29 2010-05-20 三菱電機株式会社 Multi-blade centrifugal blower
JP2009138587A (en) * 2007-12-05 2009-06-25 Fujitsu General Ltd Turbofan
JP2010196694A (en) * 2009-01-30 2010-09-09 Sanyo Electric Co Ltd Centrifugal blower and air conditioning device
JP5473457B2 (en) * 2009-07-29 2014-04-16 三菱重工業株式会社 Centrifugal compressor impeller
CN101769266B (en) * 2010-03-23 2011-08-31 上海交通大学 Centrifugal fan blade
JP6044165B2 (en) * 2012-08-09 2016-12-14 ダイキン工業株式会社 Multi-blade fan and air conditioner indoor unit including the same
KR102136879B1 (en) * 2013-04-16 2020-07-23 엘지전자 주식회사 turbo fan and ceiling type air conditioner using thereof
BR112017020267B1 (en) * 2015-03-27 2023-12-05 Ebara Corporation VOLUTE PUMP
JP6652077B2 (en) * 2017-01-23 2020-02-19 株式会社デンソー Centrifugal blower
WO2020152748A1 (en) 2019-01-21 2020-07-30 三菱電機株式会社 Fan blower, indoor unit, and air conditioner
EP4234943A4 (en) * 2020-10-23 2023-12-06 Mitsubishi Electric Corporation Multiblade centrifugal fan

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JPS61187597A (en) * 1985-02-14 1986-08-21 Nippon Kikai Gijutsu Kk Impeller for blower
JPH04159498A (en) * 1990-10-22 1992-06-02 Hitachi Ltd Impeller of multiblade fan
JP2859448B2 (en) * 1990-12-29 1999-02-17 株式会社東芝 Multi-wing fan
JPH11223199A (en) * 1998-02-05 1999-08-17 Sanyo Electric Co Ltd Centrifugal blower
WO2001005652A1 (en) * 1999-07-16 2001-01-25 Robert Bosch Corporation Centrifugal impeller with high blade camber
JP4317676B2 (en) * 2002-03-26 2009-08-19 東芝キヤリア株式会社 Turbo fan for air conditioner

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Publication number Publication date
KR100917091B1 (en) 2009-09-15
JPWO2006126408A1 (en) 2008-12-25
WO2006126408A1 (en) 2006-11-30
EP1887227A1 (en) 2008-02-13
KR20080003444A (en) 2008-01-07
JP4693842B2 (en) 2011-06-01

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Open date: 20080521