CN102734220B - Spiral casing for pneumatic extinguisher - Google Patents
Spiral casing for pneumatic extinguisher Download PDFInfo
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- CN102734220B CN102734220B CN201210245915.XA CN201210245915A CN102734220B CN 102734220 B CN102734220 B CN 102734220B CN 201210245915 A CN201210245915 A CN 201210245915A CN 102734220 B CN102734220 B CN 102734220B
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- circular arc
- arc line
- spiral case
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Abstract
The invention belongs to the field of forestry machinery, which relates to a spiral casing for a pneumatic extinguisher. The molded line of the spiral casing (A) sequentially comprises a first circular arc line (AB), a second circular arc line (BC) and a third circular arc line (CD) from a helical tongue (A), wherein the first circular arc line (AB) rotates a certain angle clockwise from the tongue (A) to a first intersecting point (B) by taking R as a radius and an impeller (2) as a center, and the angle is smaller than or equal to 180 degrees; the second circular arc line (BC) and the third circular arc line (CD) are drawn as log spirals according to an unequal base circle method; the second circular arc line (BC) adopts an circular arc from the first intersecting point (B) to a second intersecting point (C) with the radius of Ra, and a square corresponding to the circular arc takes a as the side length; and the third circular arc line (CD) adopts a circular arc from the apex (D) of an air inlet to the second intersecting point (C), with the radius Rb, and a square corresponding to the circular arc takes b as the side length. The spiral casing ensures that the power is unchanged, meanwhile solves the problems of the existing pneumatic extinguisher that the fire extinction air speed is low, the fire extinction efficiency is low and the power utility ratio is insufficient, and has great significance for effectively suppressing a fire and reducing the loss brought by the fire.
Description
Technical field
The invention belongs to forestry machinery field, relate to a kind of Pneumatic extinguisher spiral case, it is used in particular for grassland Pneumatic extinguisher.
Background technique
Grassland resources is the territorial resources that in China's agricultural natural resource, area is maximum, main.Grassland has great value, increases except the economic value of household's actions except having raise livestock, also have check winds and fix drifting sand, purify air, water conservation, prevent erosion, the multiple ecological value such as to preserve the ecological environment.Prairie fire affects grassland a key factor with development occurs.From since the establishment of the nation, only just there is grass fire more than 50,000 time in pastoral area, and accumulative disaster-stricken grassland area reaches more than 200,000,000 hectare, causes economic loss more than 600 hundred million yuan, reaches more than 10 hundred million yuan every year on average.The prairie fire that present China generally adopts equipment of putting out a fire to save life and property is Portable pneumatic extinguisher, but these small-sized fire extinguishers exist problems that effectively fire extinguishing wind speed is less, extinguishing power is not enough.
Usually, Pneumatic extinguisher is primarily of motor and centrifugal blower two-part composition, and motor is generally the two-stroke gasoline engine of customization, therefore launches mainly for centrifugal blower the research of Pneumatic extinguisher.Centrifugal blower, primarily of impeller and spiral case composition, because centrifugal blower fan blade wheel manufacturing process cost is higher, only improves fan performance and Pneumatic extinguisher price can be made to raise, be difficult to be accepted by market, and potentiality are little from these aspects.Therefore, the performance by improving blower fan to the design of spiral case is considered in research.
In Pneumatic extinguisher, the effect of spiral case to leave the gas channeling volute outlet of impeller, and change part dynamic pressure into static pressure.The structure of spiral case is complicated space curved surface body, and in theory, the molded line of spiral case is helix.Due to the critical component that spiral case is centrifugal blower, the design of spiral case inlet pressure is not only directly connected to the flow losses in spiral case, also has a significant impact the aeroperformance of impeller, and it directly affects efficiency and the performance parameter such as output flow, pressure of blower fan.
Summary of the invention
For the problems referred to above, the object of this invention is to provide a kind of Pneumatic extinguisher spiral case, it is ensureing under the constant prerequisite of power, solves existing Pneumatic extinguisher and effectively to put out a fire the problem that wind speed is less, fire-fighting efficiency is lower, power utilization is not enough.
For solving the problems of the technologies described above, the invention provides following technological scheme:
A kind of Pneumatic extinguisher spiral case, this Pneumatic extinguisher comprises motor and centrifugal blower, and centrifugal blower comprises impeller 2 and spiral case 3, the profile line of the inner side profile of described spiral case 3 is spiral case inlet pressure, it is characterized in that: described spiral case inlet pressure comprises the first circular arc line AB successively from snail tongue A, second circular arc line BC and three-arc line CD, wherein, first circular arc line AB is that radius is clockwise around angle to the first intersection points B of central rotation≤180 ° of impeller 2 with R from snail tongue A, second circular arc line BC and three-arc line CD is plotted as log spiral by not decile basic circle method, wherein the second circular arc line BC is for from the first intersection points B to the second intersection point C and radius is R
acircular arc, the square corresponding to it take a as the length of side, and three-arc line CD is for from intake grill summit D to the second intersection point C and radius is R
bcircular arc, the square corresponding to it take b as the length of side.
First circular arc line AB is that radius is clockwise around the central rotation 180 ° of spiral case inlet pressure to the first intersection points B with R from snail tongue A.
R=107.11mm，a=6.9mm，b=9.9mm，R
a=107.68mm，R
b=124.65mm。
The internal surface of the first circular arc line AB is provided with rubber pad 1.
Compared with prior art, beneficial effect of the present invention is:
The spiral case inlet pressure of spiral case of the present invention from snail tongue place in the clockwise≤angle of 180 ° adopts circular arc line, the spiral case inlet pressure of another part is drawn with inequilateral basic circle method and is become log spiral, the internal surface of the first circular arc line is provided with rubber pad simultaneously, avoid impeller due to dynamic balance bad and produce with spiral case and rub, reduce snail tongue room simultaneously, thus reduce the backflow at snail tongue place.Under dynamic constant prerequisite, by improving the design method of Pneumatic extinguisher spiral case inlet pressure, decrease the eddy current loss of blower fan, increase the power utilization of motor and effective fire extinguishing wind speed of Pneumatic extinguisher, thus improve its fire-fighting efficiency, make it can be used for putting out the larger fire of combustion intensity.
Accompanying drawing explanation
Fig. 1 is the structural representation of centrifugal blower;
Fig. 2 is the schematic diagram of spiral case inlet pressure.
Reference character
1 rubber pad 2 impeller
3 spiral case A snail tongues
B first intersection point C second intersection point
D intake grill summit AB first circular arc line
BC second circular arc line CD three-arc line
Embodiment
Below in conjunction with example and accompanying drawing, the present invention is described in further detail.
A kind of Pneumatic extinguisher spiral case disclosed in this invention, this Pneumatic extinguisher comprises motor and centrifugal blower, and the structure of this centrifugal blower as shown in Figure 1, comprises impeller 2 and spiral case 3.
As shown in Figure 2, the spiral case inlet pressure of a kind of Pneumatic extinguisher spiral case of the present invention comprises the first circular arc line AB, the second circular arc line BC and three-arc line CD successively from snail tongue A, wherein, first circular arc line AB is that radius is clockwise around angle to the first intersection points B of central rotation≤180 ° of impeller 2 with R from snail tongue A, second circular arc line BC and three-arc line CD constitutes the log spiral drawn by not decile basic circle method, and wherein the second circular arc line (BC) is for from the first intersection point (B) to the second intersection point (C) and radius is R
acircular arc, the square corresponding to it take a as the length of side, and three-arc line (CD) is for from intake grill summit (D) to the second intersection point (C) and radius is R
bcircular arc, the square corresponding to it take b as the length of side.
Wherein, the second circular arc line BC and three-arc line CD is plotted as log spiral, first by log spiral equation by not decile basic circle method
wherein, R is the radius of the circular arc of composition log spiral, and R2 is impeller radius, and B is Casing width, and c ' 2u is the circumferential speed after the outlet of leaf road, and e is the truth of a matter of natural logarithm, and Q is fan design volume flow,
for the angle that radius is between the cross section of R and the initial cross section of spiral case, will
bring formula into, obtain R
π, R
3/2 π, R
2 π, then bring into:
A, b, R can be tried to achieve
a, R
b.
Preferably, the first circular arc line AB is that radius is clockwise around the central rotation 180 ° of spiral case inlet pressure to the first intersection points B with R from snail tongue A.
Preferably, R=107.11mm, thus try to achieve a=6.9mm, b=9.9mm, R
a=107.68mm, R
b=124.65mm.
For improving the power utilization of motor, adopting the first circular arc line AB in the comparatively serious region of eddy current and the snail tongue spiral case inlet pressure risen in the scope of clockwise≤180 °, reducing the air inflow in this region, thus the eddy current loss of minimizing blower fan; Second circular arc line BC and three-arc line CD adopts inequilateral basic circle method to be plotted as log spiral, adds the airspeed of fan outlet.Further, consider the dynamic balance of impeller, the internal surface of the first circular arc line AB is provided with rubber pad 1, when avoiding impeller High Rotation Speed and spiral case produce and rub, reduce the snail tongue room of blower fan simultaneously, thus reduce the backflow at snail tongue place, improve the wind speed of blower fan.
Claims (4)
1. a Pneumatic extinguisher spiral case, this Pneumatic extinguisher comprises motor and centrifugal blower, and centrifugal blower comprises impeller (2) and spiral case (3), the profile line of the inner side profile of described spiral case (3) is spiral case inlet pressure, it is characterized in that: described spiral case inlet pressure comprises the first circular arc line (AB) successively from snail tongue (A), second circular arc line (BC) and three-arc line (CD), wherein, first circular arc line (AB) is that radius is clockwise around angle to the first intersection point (B) of central rotation≤180 ° of impeller (2) with R from snail tongue (A), second circular arc line (BC) and three-arc line (CD) are plotted as log spiral by not decile basic circle method, wherein the second circular arc line (BC) is for from the first intersection point (B) to the second intersection point (C) and radius is R
acircular arc, the square corresponding to it take a as the length of side, and three-arc line (CD) is for from intake grill summit (D) to the second intersection point (C) and radius is R
bcircular arc, the square corresponding to it take b as the length of side.
2. Pneumatic extinguisher spiral case as claimed in claim 1, is characterized in that: the first circular arc line (AB) is that radius is clockwise around the central rotation 180 ° of spiral case inlet pressure to the first intersection point (B) with R from snail tongue (A).
3. Pneumatic extinguisher spiral case as claimed in claim 1, is characterized in that: R=107.11mm, a=6.9mm, b=9.9mm, R
a=107.68mm, R
b=124.65mm.
4. Pneumatic extinguisher spiral case as claimed in claim 1, is characterized in that: the internal surface of the first circular arc line (AB) is provided with rubber pad (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210245915.XA CN102734220B (en) | 2012-07-16 | 2012-07-16 | Spiral casing for pneumatic extinguisher |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210245915.XA CN102734220B (en) | 2012-07-16 | 2012-07-16 | Spiral casing for pneumatic extinguisher |
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| Publication Number | Publication Date |
|---|---|
| CN102734220A CN102734220A (en) | 2012-10-17 |
| CN102734220B true CN102734220B (en) | 2014-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210245915.XA Expired - Fee Related CN102734220B (en) | 2012-07-16 | 2012-07-16 | Spiral casing for pneumatic extinguisher |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104696282B (en) * | 2014-12-30 | 2018-04-27 | 博耐尔汽车电气系统有限公司 | A kind of centrifugal blower volute design method |
| CN107975496B (en) * | 2017-05-23 | 2024-04-02 | 宁波方太厨具有限公司 | Centrifugal fan spiral case |
| CN107975497B (en) * | 2017-05-23 | 2024-04-02 | 宁波方太厨具有限公司 | Centrifugal fan spiral case |
| CN109871595B (en) * | 2019-01-28 | 2023-02-28 | 天津大学 | Design method of volute |
| CN110273860A (en) * | 2019-06-27 | 2019-09-24 | 珠海格力电器股份有限公司 | Air channel structure and air processor |
| CN114526253B (en) * | 2022-04-24 | 2022-07-05 | 佛山市南海九洲普惠风机有限公司 | Small boiler draught fan |
Citations (5)
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| CN2261522Y (en) * | 1996-04-10 | 1997-09-03 | 上海南泰空调风机制造公司 | Centrifugal ventilator |
| CN1651772A (en) * | 2005-02-08 | 2005-08-10 | 宁波方太厨具有限公司 | Fan Volute structure of ceiling fume exhaustor |
| CN1844759A (en) * | 2006-04-30 | 2006-10-11 | 宁波方太厨具有限公司 | Fan volute structure with air inlets on double sides for European-style smoke exhaust ventilator |
| CN201007280Y (en) * | 2006-05-16 | 2008-01-16 | 广东肇庆德通有限公司 | Rear inclined vertical type centrafugal ventilation machine |
| CN102182707A (en) * | 2011-05-09 | 2011-09-14 | 美的集团有限公司 | Centrifugal fan for range hood and volute profile generation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4631941B2 (en) * | 2008-07-18 | 2011-02-16 | 株式会社デンソー | Centrifugal blower |
-
2012
- 2012-07-16 CN CN201210245915.XA patent/CN102734220B/en not_active Expired - Fee Related
Patent Citations (5)
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|---|---|---|---|---|
| CN2261522Y (en) * | 1996-04-10 | 1997-09-03 | 上海南泰空调风机制造公司 | Centrifugal ventilator |
| CN1651772A (en) * | 2005-02-08 | 2005-08-10 | 宁波方太厨具有限公司 | Fan Volute structure of ceiling fume exhaustor |
| CN1844759A (en) * | 2006-04-30 | 2006-10-11 | 宁波方太厨具有限公司 | Fan volute structure with air inlets on double sides for European-style smoke exhaust ventilator |
| CN201007280Y (en) * | 2006-05-16 | 2008-01-16 | 广东肇庆德通有限公司 | Rear inclined vertical type centrafugal ventilation machine |
| CN102182707A (en) * | 2011-05-09 | 2011-09-14 | 美的集团有限公司 | Centrifugal fan for range hood and volute profile generation method thereof |
Non-Patent Citations (3)
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| 便携式风力灭火机的数值优化设计;辛喆等;《农业工程学报》;20110930;第27卷(第9期);第34-35页 * |
| 基于CFD的离心通风机涡壳型线结构性能分析;冯新粮等;《流体机械》;20090831;第37卷(第8期);第21-24页 * |
| 离心式通风机涡壳型线设计方法的理论分析与试验研究;潘地林等;《流体机械》;20020430;第30卷(第4期);第4-6页 * |
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| CN102734220A (en) | 2012-10-17 |
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