CN203257699U - Double-duct draught fan - Google Patents
Double-duct draught fan Download PDFInfo
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- CN203257699U CN203257699U CN 201320109084 CN201320109084U CN203257699U CN 203257699 U CN203257699 U CN 203257699U CN 201320109084 CN201320109084 CN 201320109084 CN 201320109084 U CN201320109084 U CN 201320109084U CN 203257699 U CN203257699 U CN 203257699U
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- air duct
- duct
- pass air
- draught fan
- blower
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Abstract
A double-duct draught fan comprises a draught fan impeller, a draught fan shell, a motor, an inner duct airflow channel and an outer duct airflow channel. The draught fan impeller is a double-duct draught fan impeller which is composed of an outer duct draught fan impeller and an inner duct draught fan impeller. The draught fan shell at least comprises a draught fan volute and an outer duct device, and the outer duct device is arranged on a side plate at the air inlet end of the draught fan volute and is connected with the draught fan volute into a whole through a threaded connection structure. The inner duct airflow channel is composed of an inner cavity airflow channel of the draught fan volute, and the outer duct airflow channel is composed of an inner cavity of the outer duct device or the outer duct device and the side plate at the air inlet end of the draught fan volute. The outer duct draught fan impeller is a centrifugal impeller or a propeller impeller or a propeller fan. By means of the double-duct draught fan, the blast capacity, the wind pressure and the efficiency of the draught fan are improved notably, the airflow noise is reduced effectively, and the oil fume purification rate of an extractor hood is increased notably. Further, the double-duct draught fan is simple in structure, low in cost, strong in succession ability, convenient to implement and wide in application prospect in the industries of extractor hoods and draught fans.
Description
Technical field
The present invention relates to blower fan, particularly have the blower fan of two ducts.
Background technique
The increase of fan delivery often needs to increase rotor diameter or the raising rotation speed of fan reaches.
For centrifugal fan, because between fan delivery and rotor diameter, the volute of blower size corresponding relation being arranged, increase air quantity, when increasing rotor diameter, also need increase the volute of blower relative dimensions; Yet the increase of volute of blower size can make the installation of blower fan and Environmental Conditions be restricted.
On range hood, adopt the method that increases rotor diameter, improves rotation speed of fan to improve fan delivery, not only be subject to the restriction of extractor hood structure size, also be subject to the restriction of range hood noise control.
Should increase fan delivery, not change again volute of blower boundary dimension, also will effectively control fan noise, this all is a kind of challenge concerning blower fan industry and range hood industry.
Summary of the invention
The present invention puts forward for the problems referred to above just, by the present invention, can significantly improve fan delivery in the situation that does not change the volute of blower size, effectively controls fan noise, and significantly improves fan efficiency.
The below is described in detail technological scheme content of the present invention:
Two duct blower fans comprise draught fan impeller, Blower Housing and motor at least, it is characterized in that: described pair of duct blower fan also comprises main duct air-flow path and by-pass air duct air-flow path; Described draught fan impeller is two duct draught fan impellers, is made of by-pass air duct draught fan impeller and main duct draught fan impeller, and the by-pass air duct draught fan impeller places two duct draught fan impeller inlet end outer rings, and is connected as a single entity with the main duct draught fan impeller; Described Blower Housing comprises volute of blower, by-pass air duct device at least; The by-pass air duct device places on the volute of blower inlet end side plate, is threaded connection structure or welded structure or riveted structure or mechanical interlocking structure and volute of blower and is connected as a single entity.
Described main duct air-flow path is made of volute of blower inner chamber air-flow path; Described by-pass air duct air-flow path is made of by-pass air duct device inner chamber, or jointly is made of by-pass air duct device and volute of blower inlet end side plate; The outlet of by-pass air duct air-flow path, radial clearance by by-pass air duct draught fan impeller and by-pass air duct bottom of device consists of, or consisted of by the radial clearance of by-pass air duct draught fan impeller and volute of blower inlet end side plate, or consisted of by the flow outlet on by-pass air duct bottom of device or the volute of blower inlet end side plate, or consisted of by the flow outlet on the by-pass air duct device sidewall.
Described by-pass air duct draught fan impeller is receded disk impeller, or is aial flow impeller, or is axial fan; Described by-pass air duct draught fan impeller comprises at least blade sections, diversion section and chimb is installed, and described installation chimb or is installed chimb and the cyclization of main duct draught fan impeller inlet end blades installation is integrated in the form of a ring; Diversion section places installs the chimb outer ring, and is connected as a single entity with installation chimb, blade sections; By welded structure or riveted structure or screw connection structure, installation chimb and the main duct draught fan impeller of by-pass air duct draught fan impeller is connected as a single entity.
The by-pass air duct device has following several preferred structure:
One, described by-pass air duct device is integrated the shape structure, is made of bottom, sidewall, top chimb at least, is provided with at least the perforate greater than main duct draught fan impeller diameter on the bottom.
Its two, described by-pass air duct device is integrated the shape structure, is made of top, sidewall, mounting edge at least, mounting edge is located at by-pass air duct bottom of device side wall perimeter, is provided with at least pod apertures on the top.
Its three, described by-pass air duct device is the Split assembled structure, comprises at least by-pass air duct upper-part, by-pass air duct base plate; Described by-pass air duct upper-part is made of top, sidewall, mounting edge, is provided with at least pod apertures on the top, and mounting edge is located at by-pass air duct bottom of device side wall perimeter; On the by-pass air duct base plate, be provided with at least the perforate greater than main duct draught fan impeller diameter; Fastening the structure of riveting tightly by welded structure or riveted structure or flange is connected as a single entity by-pass air duct base plate and by-pass air duct upper-part.
For the outlet of by-pass air duct air-flow path, also have so preferred:
Be provided with the guiding gutter corresponding with by-pass air duct bottom of device flow outlet and place the flow outlet of guiding gutter afterbody at volute of blower inlet end side plate.
For the by-pass air duct device, also have so preferred:
Described by-pass air duct draught fan impeller is receded disk impeller, the by-pass air duct device at least also comprises gas skirt, described gas skirt outer ring is provided with mounting edge, and inner ring is provided with pod apertures, is threaded connection structure or mechanical interlocking structure gas skirt is installed on the by-pass air duct device inlet end.
In the technique scheme, air-flow from the suction of by-pass air duct draught fan impeller, can flow out by three kinds of forms in the by-pass air duct air-flow path: 1, air-flow all enters in the main duct air-flow path, 2, air-flow partly enters in the main duct air-flow path, part flows out by the flow outlet on the by-pass air duct device sidewall, and 3, air-flow all flows out by the flow outlet on the by-pass air duct device sidewall.
Flow outlet on the by-pass air duct device sidewall, its position arranges according to actual needs.
The present invention has following beneficial effect:
1, simple in structure, inheritance is strong, cost is low, enforcement is convenient
The present invention implements at the blower foundation of conventional construction, only need to install the by-pass air duct draught fan impeller additional at the blades installation ring place of conventional fan impeller inlet end, install the by-pass air duct device additional at volute of blower inlet end side plate, can realize two duct blower fans, have the characteristics such as simple in structure, that inheritance is strong, cost is low, enforcement is convenient.
2, can significantly improve fan delivery, blast and efficient, effectively reduce the fan airflow noise
The setting of by-pass air duct draught fan impeller and by-pass air duct air-flow path significantly improves fan delivery; By-pass air duct draught fan impeller by selecting different structure or select different blade profiles, and the by-pass air duct device of selecting different structure, size can effectively be controlled the increase of fan delivery.
The conventional construction blower fan, owing to there is larger distance between draught fan impeller inlet end end face and the distolateral plate of volute air-inlet, and exist larger axis to the gap between the gas skirt, the air-flow that causes part to enter the spiral case inner chamber produces eddy current and backflow at this position, thereby fan efficiency reduces, simultaneously, because the effect of eddy current and backflow, fan noise increases, and blast reduces.
For two duct blower fans, although do not change the distance between main duct draught fan impeller inlet end end face and the distolateral plate of volute air-inlet, and also exist larger axis to the gap between by-pass air duct draught fan impeller and the by-pass air duct base plate, but, air-flow from the suction of by-pass air duct draught fan impeller, flow in the main duct air-flow path by the radial clearance between by-pass air duct draught fan impeller and the by-pass air duct base plate, under the effect of by-pass air duct passage air-flow, the airflow reflux phenomenon of having avoided the conventional construction blower fan to exist at gap location; At by-pass air duct base plate and the distolateral plate of volute air-inlet flow outlet with guide channel is set, not only can farthest reduce the loss that produces when the by-pass air duct air-flow enters the main duct air-flow path, but also the squeezing action that can produce the main duct air-flow by the by-pass air duct air-flow, reduced the eddy current loss that the main duct air-flow causes because of the formed cavity of larger distance between main duct draught fan impeller inlet end end face and the distolateral plate of volute air-inlet, simultaneously because the superposition of by-pass air duct air current flow speed, accelerated flowing of main duct air-flow, both be conducive to reduce fan noise, also be conducive to improve the air quantity of blower fan, blast and efficient.
3, adopt the range hood of two duct blower fans, air quantity, blast, efficient and fume purifying rate all can significantly improve
Two duct blower fans not only can significantly improve air quantity, blast, the efficient of blower fan, and, because the setting of by-pass air duct draught fan impeller and by-pass air duct device, separation, condensation, the purification of oil smoke all had significant humidification.
4, perforate is set as the outlet of by-pass air duct air-flow path on the culvert device sidewall outside, can satisfies different exhaust needs, and can widen the additional function of blower fan.
5, strong adaptability has a extensive future
Can according to installation, the Environmental Conditions of blower fan, corresponding by-pass air duct device and by-pass air duct draught fan impeller be set; Can installing, under the condition that Environmental Conditions is constant, realizing the exchange of conventional fan and two duct blower fans, be conducive to popularization, the application of two duct blower fans.
The present invention all has broad application prospects in range hood industry, blower fan industry.
Description of drawings
Fig. 1～13rd, the structural representation of exemplary embodiments 1～3 of the present invention, wherein:
Fig. 1～8th, two duct blower fan structure schematic representation of embodiment 1, embodiment 1 by-pass air duct draught fan impeller is aial flow impeller, by-pass air duct device profile is different form;
Fig. 9～10th, two duct blower fan structure schematic representation of embodiment 2, embodiment 2 by-pass air duct draught fan impeller is receded disk impeller, and by-pass air duct device profile is different form, and the by-pass air duct device also comprises collecting cover;
Figure 11～13rd, two duct blower fan structure schematic representation of embodiment 3, embodiment 3 by-pass air duct draught fan impeller is aial flow impeller, the rounded shape of by-pass air duct device profile.
More specifically:
Fig. 1 is two duct blower fan perspective view of the embodiment of the invention 1;
Fig. 2 is two duct blower fan cross-sectional view (full section) of the embodiment of the invention 1;
Fig. 3 is two duct draught fan impeller perspective view of the embodiment of the invention 1
Fig. 4 is two duct draught fan impeller cross-sectional view (full section) of the embodiment of the invention 1;
Fig. 5 is the by-pass air duct device perspective view of the embodiment of the invention 1;
Fig. 6 is the by-pass air duct device stereochemical structure partial schematic diagram (broken section) of the embodiment of the invention 1;
Fig. 7 is two duct blower fan stereochemical structure partial schematic diagrams (main expression is with the by-pass air duct flow outlet structure of guiding gutter, represents that with arrow the by-pass air duct air-flow is by the situation with the flow outlet of guiding gutter among the figure) of the embodiment of the invention 1;
Fig. 8 is the perspective view of the volute of blower inlet end side plate of the embodiment of the invention 1;
Fig. 9 is two duct blower fan perspective view (full section, by-pass air duct draught fan impeller are centrifugal) of the embodiment of the invention 2;
Figure 10 is two duct fan impeller structure schematic representation of the embodiment of the invention 2;
Figure 11 is two duct blower fan perspective view of the embodiment of the invention 3;
Figure 12 is two duct blower fan stereochemical structure partial schematic diagrams (main expression is with the by-pass air duct flow outlet structure of guiding gutter, represents that with arrow the by-pass air duct air-flow is by the situation with the flow outlet of guiding gutter among the figure) of the embodiment of the invention 3;
Figure 13 is the by-pass air duct device perspective view of the embodiment of the invention 3.
Embodiment
Below in conjunction with embodiment 1～3 and embodiment's accompanying drawing 1～13, the present invention is described in detail in detail how implements:
Shown in Fig. 1～8, two duct blower fans of present embodiment comprise draught fan impeller, Blower Housing and motor at least, and described pair of duct blower fan also comprises main duct air-flow path 1 and by-pass air duct air-flow path 2; Described draught fan impeller is two duct draught fan impellers, is made of main duct draught fan impeller 3 and by-pass air duct draught fan impeller 4, and the by-pass air duct draught fan impeller places two duct draught fan impeller inlet end outer rings, and is connected as a single entity with the main duct draught fan impeller; Described Blower Housing comprises volute of blower 5, by-pass air duct device 6 at least;
By-pass air duct draught fan impeller 4 is aial flow impeller, and the by-pass air duct draught fan impeller comprises at least blade sections 4.1, diversion section 4.2 and chimb 4.3 is installed, and chimb is installed in the form of a ring, and diversion section places installs the chimb outer ring, and is connected as a single entity with installation chimb, blade sections; On the blades installation ring 3.1 that chimb 4.3 and main duct draught fan impeller 3 are installed, riveted holes 4a, 3a are set respectively, are connected as a single entity by installation chimb and the main duct draught fan impeller of rivet with the by-pass air duct draught fan impeller.
Main duct air-flow path 1 is made of volute of blower inner chamber air-flow path; By-pass air duct air-flow path 2 is made of by-pass air duct device inner chamber; The by-pass air duct device is the Split assembled structure, comprises at least by-pass air duct upper-part 6.1, by-pass air duct base plate 6.2; The by-pass air duct upper-part is made of top 6.1-1, sidewall 6.1-2, mounting edge 6.1-3, and crown center is provided with pod apertures 6.1-4, and mounting edge is located at by-pass air duct bottom of device side wall perimeter; On the by-pass air duct base plate, be provided with the perforate 6.2-1 greater than main duct draught fan impeller diameter, be provided with several by-pass air duct flow outlet 6.2-2 and several mounting holes 6.2a; Keep radial clearance 7 between by-pass air duct draught fan impeller and the by-pass air duct bottom of device perforate 6.2-1; On volute of blower inlet end side plate 5.1, be provided with the flow outlet 5.1-2 that bottom by-pass air duct, goes up the corresponding guiding gutter 5.1-1 of by-pass air duct flow outlet and place the guiding gutter afterbody, thereby form the flow outlet with guide channel 8; Be provided with several tapped holes 5.1a around along volute of blower inlet end side plate center drilling 5.1-3 place, its position is corresponding with the mounting hole 6.2a on the by-pass air duct base plate; Fastening the structure of riveting tightly by flange is connected as a single entity by-pass air duct base plate and by-pass air duct upper-part; The by-pass air duct device is installed on the volute of blower inlet end side plate first with screw, in the usual way two duct draught fan impellers is connected with motor again; The air-flow that sucks from the by-pass air duct draught fan impeller, radial clearance 7 places by by-pass air duct draught fan impeller and by-pass air duct bottom of device and with the flow outlet 5.1-2 place of guide channel enter in the main duct air-flow path.
Shown in Fig. 9,10, the present embodiment difference from Example 1 only is: the by-pass air duct draught fan impeller is receded disk impeller; Culvert device upper-part top is provided with several tapped holes 6.1-1a around pod apertures outside; The by-pass air duct device also comprises gas skirt 9, and gas skirt is provided with mounting edge 9.1, pod apertures 9.2, and pod apertures is to in-flanges, and mounting edge is provided with several mounting holes 9a, and its position is corresponding with the tapped hole 6.1-1a at by-pass air duct device upper-part top; The by-pass air duct device that will not contain gas skirt with screw is installed on the Blower Housing, in the usual way two duct blower fan wind wheels is connected with motor, with screw gas skirt is installed on the by-pass air duct device upper-part.
Shown in Figure 11～13, the present embodiment difference from Example 1 is: the by-pass air duct device is integrated the shape structure, rounded shape, consisted of by bottom 6.3, sidewall 6.4, top chimb 6.5, the chimb outside, top is with flange, the bottom is provided with the round hole 6.3-1 greater than main duct draught fan impeller diameter, and edge, hole circumference is provided with several mounting holes 6.3a; On the volute of blower inlet end side plate 5.1, be provided with several tapped holes 5.1a around center drilling 5.1-1, its position is corresponding with the mounting hole 6.3a on the by-pass air duct bottom; Guiding gutter and place the flow outlet of guiding gutter afterbody on by-pass air duct flow outlet on the bottom and the volute of blower inlet end side plate, except indivedual differences, all the other are all identical.
For above-described embodiment, also can implement like this:
Outside on the bottom or base plate of culvert device, on volute of blower inlet end side plate, the by-pass air duct flow outlet all is not set, the air-flow that sucks from the by-pass air duct draught fan impeller, the radial clearance place by by-pass air duct draught fan impeller and by-pass air duct bottom of device enters in the main duct air-flow path; Also on the sidewall of culvert device the by-pass air duct flow outlet is set outside, flow outlet quantity and position are determined as required, on the by-pass air duct sidewall flow outlet are set, and can expand the additional function of blower fan.
For the axial flow by-pass air duct draught fan impeller of implementing in 1,2, also the by-pass air duct draught fan impeller of available axial flow fan structure is replaced.
Above-described embodiment only relates to several typical structure of the present invention, though other example structure of the present invention are not enumerated, protected by the present invention.
Claims (8)
1. two duct blower fans comprise draught fan impeller, Blower Housing and motor at least, it is characterized in that:
Described pair of duct blower fan also comprises main duct air-flow path and by-pass air duct air-flow path;
Described draught fan impeller is two duct draught fan impellers, is made of by-pass air duct draught fan impeller and main duct draught fan impeller, and the by-pass air duct draught fan impeller places two duct draught fan impeller inlet end outer rings, and is connected as a single entity with the main duct draught fan impeller;
Described Blower Housing comprises volute of blower, by-pass air duct device at least; The by-pass air duct device places on the volute of blower inlet end side plate, is threaded connection structure or welded structure or riveted structure or mechanical interlocking structure and volute of blower and is connected as a single entity.
2. according to claim 1 pair of duct blower fan is characterized in that:
Described main duct air-flow path is made of volute of blower inner chamber air-flow path; Described by-pass air duct air-flow path is made of by-pass air duct device inner chamber, or jointly is made of by-pass air duct device and volute of blower inlet end side plate;
The outlet of by-pass air duct air-flow path, radial clearance by by-pass air duct draught fan impeller and by-pass air duct bottom of device consists of, or consisted of by the radial clearance of by-pass air duct draught fan impeller and volute of blower inlet end side plate, or consisted of by the flow outlet on by-pass air duct bottom of device or the volute of blower inlet end side plate, or consisted of by the flow outlet on the by-pass air duct device sidewall.
3. according to claim 1 pair of duct blower fan is characterized in that:
Described by-pass air duct draught fan impeller is receded disk impeller, or is aial flow impeller, or is axial fan; Described by-pass air duct draught fan impeller comprises at least blade sections, diversion section and chimb is installed, and described installation chimb or is installed chimb and the cyclization of main duct draught fan impeller inlet end blades installation is integrated in the form of a ring; Diversion section places installs the chimb outer ring, and is connected as a single entity with installation chimb, blade sections; By welded structure or riveted structure or screw connection structure, installation chimb and the main duct draught fan impeller of by-pass air duct draught fan impeller is connected as a single entity.
4. according to claim 2 pair of duct blower fan is characterized in that:
Described by-pass air duct device is integrated the shape structure, is made of bottom, sidewall, top chimb at least, is provided with at least the perforate greater than main duct draught fan impeller diameter on the bottom.
5. according to claim 2 pair of duct blower fan is characterized in that:
Described by-pass air duct device is integrated the shape structure, is made of top, sidewall, mounting edge at least, and mounting edge is located at by-pass air duct bottom of device side wall perimeter, is provided with at least pod apertures on the top.
6. according to claim 2 pair of duct blower fan is characterized in that:
Described by-pass air duct device is the Split assembled structure, comprises at least by-pass air duct upper-part, by-pass air duct base plate; Described by-pass air duct upper-part is made of top, sidewall, mounting edge, is provided with at least pod apertures on the top, and mounting edge is located at by-pass air duct bottom of device side wall perimeter; On the by-pass air duct base plate, be provided with at least the perforate greater than main duct draught fan impeller diameter; Fastening the structure of riveting tightly by welded structure or riveted structure or flange is connected as a single entity by-pass air duct base plate and by-pass air duct upper-part.
7. according to claim 2 pair of duct blower fan is characterized in that:
Be provided with the guiding gutter corresponding with by-pass air duct bottom of device flow outlet and place the flow outlet of guiding gutter afterbody at volute of blower inlet end side plate.
8. according to claim 3 pair of duct blower fan is characterized in that:
Described by-pass air duct draught fan impeller is receded disk impeller, the by-pass air duct device at least also comprises gas skirt, described gas skirt outer ring is provided with mounting edge, and inner ring is provided with pod apertures, is threaded connection structure or mechanical interlocking structure gas skirt is installed on the by-pass air duct device inlet end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320109084 CN203257699U (en) | 2013-02-22 | 2013-02-22 | Double-duct draught fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320109084 CN203257699U (en) | 2013-02-22 | 2013-02-22 | Double-duct draught fan |
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| CN203257699U true CN203257699U (en) | 2013-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320109084 Expired - Fee Related CN203257699U (en) | 2013-02-22 | 2013-02-22 | Double-duct draught fan |
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| Country | Link |
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| CN (1) | CN203257699U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103148001A (en) * | 2013-02-22 | 2013-06-12 | 吴钰 | Double ducted-fan blower |
| CN104405530A (en) * | 2014-10-16 | 2015-03-11 | 南京航空航天大学 | Exhaust noise reduction system of separated exhaust type turbofan engine |
| CN111237214A (en) * | 2018-11-29 | 2020-06-05 | 曾固 | Centrifugal through-flow air vehicle traction device and application |
-
2013
- 2013-02-22 CN CN 201320109084 patent/CN203257699U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103148001A (en) * | 2013-02-22 | 2013-06-12 | 吴钰 | Double ducted-fan blower |
| CN104405530A (en) * | 2014-10-16 | 2015-03-11 | 南京航空航天大学 | Exhaust noise reduction system of separated exhaust type turbofan engine |
| CN111237214A (en) * | 2018-11-29 | 2020-06-05 | 曾固 | Centrifugal through-flow air vehicle traction device and application |
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