CN2256952Y - Axial-flow centrifugal double-acting axial-flow ventilator - Google Patents
Axial-flow centrifugal double-acting axial-flow ventilator Download PDFInfo
- Publication number
- CN2256952Y CN2256952Y CN 95240446 CN95240446U CN2256952Y CN 2256952 Y CN2256952 Y CN 2256952Y CN 95240446 CN95240446 CN 95240446 CN 95240446 U CN95240446 U CN 95240446U CN 2256952 Y CN2256952 Y CN 2256952Y
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- impeller
- flow
- prime
- motor
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- 230000008676 import Effects 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 4
- 229910052755 nonmetal Inorganic materials 0.000 claims 3
- 239000012530 fluid Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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Abstract
An axial-flow centrifugal double-acting axial-flow fan with the characteristic of a centrifugal fan under a small flow rate is particularly suitable for roadway driving with frequent resistance change and small air volume change.
Description
The utility model relates to the propeller fan that a kind of vented exhaust is used, a kind of propeller fan with axial flow and centrifugal double-action that can have the centrifugal blower characteristic under small flow of more specifically saying so.It is frequent and air quantity changes little tunnelling that it is specially adapted to change in resistance.
Present plain shaft flow fan, under design discharge, air-flow in the blower fan is that straight flow is crossed impeller vertically, the fan characteristic of this moment is best, most effective, but when flow changes, because top or root at blade generate vortex, cause the pressure of blower fan also to change, particularly when flow reduces to certain numerical value thereupon, go out the low energy vortex of interruption-forming and the high energy vortex that forms in leaf top inlet makes streamline updip degree aggravation through impeller blade root, cause high-energy fluid and air duct serious impact, the loss aggravation, pressure sharply descends, further minimizing along with flow, pressure is bottom out again, makes the blast curve of blower fan tedious " shape of a saddle " occur, for ensureing the blower fan safe handling, the operation point can not be positioned at the left side in maximal pressure force, promptly in " shape of a saddle " zone, if the operation point of blower fan is positioned at unsettled " shape of a saddle " zone, the vibration of blower fan and noise all can aggravate, also can damage blower fan when serious, cause the accident.Therefore, the operating range of plain shaft flow fan is generally narrower, and therefore its application area also is restricted.In order to eliminate " shape of a saddle ", though all carried out number of research projects both at home and abroad, obtained certain progress, basically " shape of a saddle " reduced or eliminate, but the maximal pressure force change in location of blower fan is little, pressure maximum is also constant substantially, when off-design operation point, blower fan operation point, the decrease in efficiency of blower fan is very fast, and the operating range of blower fan is still very narrow, that is to say, fundamentally do not solve the low and narrow problem of operating range of axial flow fan pressure at present as yet.
The purpose of this utility model is exactly in order to overcome above-mentioned the deficiencies in the prior art part, thereby designed a kind of propeller fan with axial flow and centrifugal double-action, the blast curve of this blower fan has been eliminated " shape of a saddle " fully, and the characteristic that under small flow, also has centrifugal blower, the pressure ratio plain shaft flow fan height of this blower fan, efficiency curve is smooth, and operating range is wide, and adaptability is strong.
Task of the present utility model realizes in the following way, a kind of propeller fan with axial flow and centrifugal double-action, whole parts of this blower fan are made with metal or nonmetallic material, the import air duct is arranged, cowling and prime shunt, prime impeller and back level impeller are arranged thereafter, inner core is arranged respectively after each impeller, middle tube and urceolus, form a low-pressure channel between inner core and the middle tube, form a high-pressure channel between middle tube and the urceolus, have annular or bar hole on the middle tube, high-pressure channel is communicated with low-pressure channel, be separately installed with low-pressure channel stator and high-pressure channel stator in two passages, by stator inner core, middle tube and urceolus fuse, and built-in motor can be that whole motor is fixed in the inner core, also can inner core as the stationary part of motor, built-in motor can the rear and front end shaft, and prime impeller and back level impeller are installed respectively, constitutes the two-stage blower fan, also can a front end shaft, the prime impeller is installed, is removed back level impeller, constitute simple fan.
The utility model is compared with present plain shaft flow fan, has significant advantage, when flow is equal to or greater than design discharge, the present invention has kept the big flow characteristics of axial-flow blower, when flow during less than design discharge, can make the best use of the situation be useful energy with the Conversion of energy of vortex, not only eliminated " shape of a saddle " fully, and improved the pressure and the efficient of blower fan, and make the operating range of blower fan broad more, improved the adaptive capacity of blower fan greatly.
Description of drawings:
Accompanying drawing 1 is a structural representation of the present utility model.
Accompanying drawing 2 is the utility model air current flow process schematic representation under small flow.
Embodiment below in conjunction with accompanying drawing provides does detailed description further to the utility model.As shown in Figure 1, the utility model is mainly by cowling 1, import air duct 2, prime shunt 3, prime impeller 4, inner core 5, middle tube 6, urceolus 7, high-pressure channel stator 8, low-pressure channel stator 9, back level impeller 10 and built-in motor 11 are formed, and import air duct 1 is fixedlyed connected with the front end of prime shunt 3 and is integral, and the inner cylinder of prime shunt 3 passes through some gussets and is connected with cowling 1, prime impeller 4 and back level impeller 10 are housed thereafter, behind every grade of impeller, inner core 5 is arranged respectively, middle tube 6 and urceolus 7 form a low-pressure channel b between inner core 5 and the middle tube 6, form a high-pressure channel a between middle tube 6 and the urceolus 7, appropriate position at middle tube 6 has annular or bar hole, and low-pressure channel b is communicated with high-pressure channel a, between urceolus 7 and the middle tube 6, in be connected with the interior low-pressure channel stator 9 of low-pressure channel b by the interior high-pressure channel stator 8 of high-pressure channel a respectively between tube 6 and the inner core 5, make inner core 5, middle tube 6 and urceolus 7 link into an integrated entity.The rear end of prime shunt 3 is connected with stage casing urceolus 7 by flange plate, and leading portion urceolus 7 also is connected with flange plate with back segment urceolus 7.Built-in motor 11 can be that whole motor is fixed in the leading portion inner core 5, also can be the stationary part of leading portion inner core 5 as built-in motor 11.Built-in motor 11 rear and front end shafts are installed prime impeller 4 and back level impeller 10 respectively, constitute the two-stage blower fan.
When built-in motor 11 drives prime impeller 4 and back level impeller 10 rotations, in passage, form distinguished and admirable, when flow was equal to or greater than design discharge, fluid almost all flow through from low-pressure channel b, and the distinguished and admirable flow condition of this moment and the distinguished and admirable flow condition of plain shaft flow fan are basic identical.When flow during less than design discharge, because of the streamline deflection that makes progress, thereby the high-pressure liquid that part flows out from the leaf top is shunted from high-pressure channel a, so both avoided the generation of blade tip eddy, made full use of the advantage of leaf top work done again, make the pressure increase of blower fan.Further minimizing along with flow, the shared ratio of the fluid of process is just big more from high-pressure channel a, the centrifugal characteristic of impeller just more shows fully, the distinguished and admirable flowing state of this moment develops to centrifugal blower, when flow levels off to zero the time, distinguished and admirable flow condition and centrifugal blower are basic identical, therefore, can avoid " shape of a saddle " of axial-flow blower fully, the pressure ratio plain shaft flow fan of blower fan is also high simultaneously.
The effect of prime shunt 3 as shown in Figure 2, induce the blade tip eddy of prime impeller 4, make the inlet velocity trend evenly, owing to there is the high-pressure liquid of prime impeller 4 from high-pressure channel a, to flow out, thereby restricted the generation and the development of the blade tip eddy of back level impeller 10, made function of the present utility model be able to smooth realization.
Claims (7)
1. propeller fan with axial flow and centrifugal double-action that is applicable to vented exhaust, comprise import air duct (1), cowling (2), prime impeller (4), back level impeller (10) and built-in motor (11), it is characterized in that: behind import air duct (1), be provided with a prime shunt (3), the inner cylinder of prime shunt (3) is connected with cowling (2) by gusset, behind prime impeller (4) and back level impeller (10), inner core (5) is arranged respectively, middle tube (6) and urceolus (7), form a low-pressure channel b between inner core (5) and the middle tube (6), form a high-pressure channel a between middle tube (6) and the urceolus (7), middle tube (6) has annular or bar hole, high-pressure channel a is communicated with low-pressure channel b, be separately installed with high-pressure channel stator (8) and low-pressure channel stator (9) in two passages, by stator inner core (5), middle tube (6) and urceolus (7) link into an integrated entity, built-in motor (11) is positioned at the inner core (5) behind the prime impeller (4), and the two ends shaft is installed prime impeller (4) and back level impeller (10) respectively.
2. propeller fan with axial flow and centrifugal double-action according to claim 1 is characterized in that: the built-in motor of this ventilator (11) is a front end shaft, and prime impeller (4) is installed, and removes back level impeller (10), constitutes simple fan.
3. propeller fan with axial flow and centrifugal double-action according to claim 1 and 2 is characterized in that: the built-in motor of this ventilator (11) is that whole motor is fixed in the inner core (5).
4. propeller fan with axial flow and centrifugal double-action according to claim 1 and 2 is characterized in that: the built-in motor of this ventilator (11) is with the stationary part of inner core (5) as motor.
5. propeller fan with axial flow and centrifugal double-action according to claim 1 and 2 is characterized in that: whole parts of this ventilator adopt metal or nonmetal making.
6. propeller fan with axial flow and centrifugal double-action according to claim 3 is characterized in that: whole parts of this ventilator adopt metal or nonmetal making.
7. propeller fan with axial flow and centrifugal double-action according to claim 4 is characterized in that: whole parts of this ventilator adopt metal or nonmetal making.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95240446 CN2256952Y (en) | 1995-09-01 | 1995-09-01 | Axial-flow centrifugal double-acting axial-flow ventilator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95240446 CN2256952Y (en) | 1995-09-01 | 1995-09-01 | Axial-flow centrifugal double-acting axial-flow ventilator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2256952Y true CN2256952Y (en) | 1997-06-25 |
Family
ID=33882029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95240446 Expired - Fee Related CN2256952Y (en) | 1995-09-01 | 1995-09-01 | Axial-flow centrifugal double-acting axial-flow ventilator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2256952Y (en) |
-
1995
- 1995-09-01 CN CN 95240446 patent/CN2256952Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |