CN107620721A - A kind of double blast cap axial-flow roof ventilators - Google Patents
A kind of double blast cap axial-flow roof ventilators Download PDFInfo
- Publication number
- CN107620721A CN107620721A CN201710967511.4A CN201710967511A CN107620721A CN 107620721 A CN107620721 A CN 107620721A CN 201710967511 A CN201710967511 A CN 201710967511A CN 107620721 A CN107620721 A CN 107620721A
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- Prior art keywords
- blast cap
- air
- interior
- flow passage
- air outlet
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- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 239000011152 fibreglass Substances 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000005119 centrifugation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The present invention relates to roof ventilator field, refer in particular to a kind of double blast cap axial-flow roof ventilators, including outer blast cap, the interior blast cap being arranged on above air duct, the interior blast cap is arranged in outer blast cap, and interior blast cap is ring-type arc-shaped structure, outer blast cap air outlet is divided into ring-like inner flow passage air outlet and ring-like outer flow passage air outlet.After such scheme, air-out passage is added, the wind locking phenomenon caused by airflow obstruction effect in blast cap is improved, runner windage can be reduced, improve fan efficiency.
Description
Technical field
The present invention relates to roof ventilator field, refers in particular to a kind of double blast cap axial-flow roof ventilators.
Background technology
Roof ventilator is arranged on the roof in house, for outdoor air draft, to prevent rainwater and foreign matter from falling into, being all provided with
Blast cap.The wind that axial flow blower is up discharged vertically flows downward out after the turning of 180 degree occurs after encountering blast cap, due to centrifugation
The effect of power, air-flow can be offset laterally, and so as to occur the effect extruded laterally in runner, air-flow is mainly from close to blast cap
Outside the region delivery chamber of wall, " air-blast atomizer " phenomenon is formed, " nozzle " resistance and its resistance coefficient can be with the increases of air-flow velocity
And increase, therefore airflow obstruction is caused, even if increase axial flow fan pressure and matched power can not effectively increase roof ventilator
Air quantity, reduce the drafting efficiency of roof ventilator.For this phenomenon, the present inventor makes further research to this, develops
Thus a kind of double blast cap axial-flow roof ventilators, this case produce.
The content of the invention
It is an object of the invention to provide a kind of double blast cap axial-flow roof ventilators, increase gas channel, improve in blast cap
Airflow obstruction phenomenon, reduce runner windage, improve fan efficiency.
To achieve these goals, technical scheme is as follows：
A kind of double blast cap axial-flow roof ventilators, including it is arranged on outer blast cap, interior blast cap above air duct, the interior blast cap
It is arranged in outer blast cap, and interior blast cap is ring-type arc-shaped structure, interior blast cap is by outer blast cap air outlet by single air-out passage point
Into two air-out passages of ring-like inner flow passage air outlet and ring-like outer flow passage air outlet.
Further, the inner surface of the surfaces externally and internally of the interior blast cap and outer blast cap is streamlined structure.
Further, the interior blast cap is that fiberglass, carbon steel or stainless steel make with outer blast cap.
Further, the air inlet sectional area of the inner flow passage and the air inlet sectional area of outer flow passage are equal；The inner flow passage
Air outlet sectional area it is equal with the air outlet sectional area of outer flow passage.
Further, the blast cap air-out passage can increase to two or more by blast cap quantity in increase.
After such scheme, the present invention compared with prior art, has advantages below：
Improve the Airflow obstruction phenomenon in blast cap by increasing gas channel, reduce runner windage, realize and improve blower fan
The function of efficiency.
Brief description of the drawings
Fig. 1 is the schematic diagram of the present invention；
Label declaration
Base plate 1, electric machine support 2, motor 3, impeller 4, air duct 5, interior blast cap 6,
Outer blast cap 7, inner flow passage 8, outer flow passage 9.
Embodiment
The present invention is further illustrated with specific embodiment below in conjunction with the accompanying drawings.
As illustrated, a kind of double blast cap axial-flow roof ventilators, including base plate 1, electric machine support 2, motor 3, impeller
4th, air duct 5, interior blast cap 6, outer blast cap 7, air duct 5 are arranged on base plate 1, and motor 3 is arranged at air duct 5 by electric machine support 2
Interior, the round end of motor 3 is connected with impeller 4, and the top of air duct 5 is provided with outer blast cap 7, interior blast cap is provided between outer blast cap 7 and air duct 5
6。
Blast cap air inlet is divided into by the ring-like air inlet of inner flow passage 8 and ring-like outer by blast cap 6 in the circular arc in outer blast cap 7
The air inlet of runner 9, blast cap air outlet is divided into the ring-like air outlet of inner flow passage 8 and ring-like outer flow passage 9 air outlet (arrow logo in figure
For airflow direction), its air-admitting surface of inner flow passage 8 is equal with the air-admitting surface of outer flow passage 9, the air-out open area of inner flow passage 8 with it is outer
The air outlet area equation of runner 9, windage caused by so as to have the function that shunting, effectively reducing " aerodynamic blockage " can be significantly
Degree improves the exhaust air rate of roof ventilator.The surfaces externally and internally of blast cap 6 and the inner surface of outer blast cap 7 are designed to streamlined also can in simultaneously
Further reduce windage, improve fan efficiency.Blast cap material can be made by fiberglass, carbon steel or stainless steel.
It above are only the specific embodiment of the present invention, at the same it is involved such as " upper and lower, left and right, centre " in all present invention
Deng word, only it is used as with reference to not absolute limit, all changes using present invention progress unsubstantiality, all should belong to and invade this hair
The behavior of bright protection domain.
Claims (5)
- A kind of 1. double blast cap axial-flow roof ventilators, it is characterised in that：Including outer blast cap, the interior blast cap being arranged on above air duct, The interior blast cap is arranged in outer blast cap, and interior blast cap is ring-type arc-shaped structure, and interior blast cap is by outer blast cap air outlet by single Air-out passage is divided into two air-out passages of ring-like inner flow passage air outlet and ring-like outer flow passage air outlet.
- A kind of 2. double blast cap axial-flow roof ventilators according to claim 1, it is characterised in that：The interior blast cap it is inside and outside Surface and the inner surface of outer blast cap are streamlined structure.
- A kind of 3. double blast cap axial-flow roof ventilators according to claim 1, it is characterised in that：The interior blast cap and exogenous wind Cap is that fiberglass, carbon steel or stainless steel make.
- A kind of 4. double blast cap axial-flow roof ventilators according to claim 1, it is characterised in that：The air intake of the inner flow passage Mouth sectional area is equal with the air inlet sectional area of outer flow passage；The air outlet sectional area of the inner flow passage and the air outlet of outer flow passage are cut Area equation.
- A kind of 5. double blast cap axial-flow roof ventilators according to claim 1, it is characterised in that：The blast cap air-out passage Two or more can be increased to by blast cap quantity in increase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710967511.4A CN107620721A (en) | 2017-10-18 | 2017-10-18 | A kind of double blast cap axial-flow roof ventilators |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710967511.4A CN107620721A (en) | 2017-10-18 | 2017-10-18 | A kind of double blast cap axial-flow roof ventilators |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107620721A true CN107620721A (en) | 2018-01-23 |
Family
ID=61092395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710967511.4A Pending CN107620721A (en) | 2017-10-18 | 2017-10-18 | A kind of double blast cap axial-flow roof ventilators |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107620721A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2577032A (en) * | 2018-06-20 | 2020-03-18 | Elta Fans Ltd | A fan housing assembly |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2035009U (en) * | 1988-04-19 | 1989-03-29 | 余跃 | Wind-powered roof aspirator |
| CN2078385U (en) * | 1990-09-10 | 1991-06-05 | 上海交通大学 | Roof ventilator |
| AU2008200681A1 (en) * | 2007-08-22 | 2009-03-12 | Cfm Fans Pty. Ltd. | Exhaust fan |
| CN207647805U (en) * | 2017-10-18 | 2018-07-24 | 浙江金盾风机装备有限公司 | A kind of double blast cap axial-flow roof ventilators |
-
2017
- 2017-10-18 CN CN201710967511.4A patent/CN107620721A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2035009U (en) * | 1988-04-19 | 1989-03-29 | 余跃 | Wind-powered roof aspirator |
| CN2078385U (en) * | 1990-09-10 | 1991-06-05 | 上海交通大学 | Roof ventilator |
| AU2008200681A1 (en) * | 2007-08-22 | 2009-03-12 | Cfm Fans Pty. Ltd. | Exhaust fan |
| CN207647805U (en) * | 2017-10-18 | 2018-07-24 | 浙江金盾风机装备有限公司 | A kind of double blast cap axial-flow roof ventilators |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2577032A (en) * | 2018-06-20 | 2020-03-18 | Elta Fans Ltd | A fan housing assembly |
| GB2577032B (en) * | 2018-06-20 | 2020-09-23 | Elta Fans Ltd | A fan housing assembly |
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| 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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180123 |