CN1313737C - Anti-surge ring of axial fan - Google Patents
Anti-surge ring of axial fan Download PDFInfo
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- CN1313737C CN1313737C CNB2005100236405A CN200510023640A CN1313737C CN 1313737 C CN1313737 C CN 1313737C CN B2005100236405 A CNB2005100236405 A CN B2005100236405A CN 200510023640 A CN200510023640 A CN 200510023640A CN 1313737 C CN1313737 C CN 1313737C
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Abstract
The present invention relates to an anti-surge vibration ring of a propeller fan, which belongs to the technical fields of fans and ventilating engineering. The anti-surge vibration ring is a circular ring body whose front and rear are symmetrical along an airflow direction. The circular ring body forms a shape alternated with concave parts and convex parts. The anti-surge vibration ring is one part of the casing of a propeller fan for tunnels, and is composed of outer rings, inner rings and circular rings, wherein the outer diameters of the circular rings are consistent with the diameters of the outer rings, and the inner diameters of the circular rings are consistent with the diameters of the inner rings; the number of the outer rings is between 2 and 5, the number of the inner rings is 1 less than the number of the outer rings, and the number of the circular rings is twice of the number of the inner rings. The anti-surge vibration ring is composed of three outer rings, two inner rings and four circular rings in a most common form. The front edge and the rear edge of the top of the blade of the propeller fan are respectively positioned at the points of the front concave space and the rear concave space of the anti-surge vibration ring, and the concave space of the anti-surge vibration ring can inhibit the development of inlet eddy flow. Thereby, the occurrence of fan surge can be delayed by the anti-surge vibration ring, and the fan surge can be even prevented from occurring. As the front and the rear of the anti-surge vibration ring are symmetrical, when the fan in subways, railroads and vehicular tunnels, which require bidirectional ventilation, rotates reversely, the anti-surge vibration ring can generate the same anti-surge effect.
Description
Technical field
What the present invention relates to is a kind of anti-surge ring of axial fan, and particularly a kind of anti-surge ring of axial fan that is applicable to subway or tunnel belongs to blower fan and ventilating engineering technical field.
Background technique
Along with the development of national economy, the communication of China has also had extraordinary development.Subway in the city, the railway that passes through mountain, vcehicular tunnel get more and more.Because the height in tunnel is limited, length is very long again, the particular importance that seems of the ventilation in the tunnel.Ventilating problem in subway, railway, the vcehicular tunnel is mainly born by medium-and-large-sized axial-flow blower now.But because of ventilation pipe network and silencing apparatus stop up, or the piston wind effect that causes of subway train, automobile reverse driving and cause the moment back pressure excessive, the air quantity of blower fan is sharply descended.Cause blower fan generation stall, surge, and cause acute row vibration, can damage blower fan when serious.For a safe and reliable traffic environment is provided to people, the surge of eliminating propeller fan is very necessary.And eliminate or weaken the airflow reflux on fan blade import top, just can suppress the generation of surge, or pumping point is offset to small flow place more, reduce to take place the possibility of surge.
In the prior art, the patent No. is ZL 00218027.8, the utility model patent that name is called " propeller fan anti-surge installation " is to adopt in " between shell and the inner ring " setting " equally distributed guide vane ", and " the axioversion angle of described guide vane in shell and inner ring can be 30 °～90 °; described guide vane number can be 30～150 ", because blade is many, to be consistent during assembling, require height, so increased the difficulty of producing; The patent No. is ZL 01105719.x, name is called interior simplified " being is the solid of rotation of axle with the blower fan shaft axis; the outer surface of this solid of rotation is to be made of cylndrical surface and arc surface " of the patent of invention employing of " surge preventer for tunnel jet blower ", because the machine shaping of arc surface has certain degree of difficulty, and the radial dimension increase of blower fan is bigger, has occupied space valuable in the tunnel.The patent No. is CN 2448969, name is called in the utility model patent of " anti-surge axial-flow blower " " the anti-asthma ring comprises collection whirlpool groove; along the circumferential direction evenly arrange one group of snail sheet that disappears in the groove of collection whirlpool, near the blade place one collector ring be set in that the snail sheet that disappears is inboard, collection whirlpool groove side is also adorned guide ring near blade end ".This structure is very complicated, consuming time taking a lot of work during installation.
Summary of the invention
For deficiency and the defective that overcomes prior art, improve the operating conditions of axial-flow blower when small flow, it is more simple, rationally that the present invention designs a kind of structure, easy to process and can effectively eliminate the stall that may occur in the axial-flow blower work, the anti-surge ring of surging phenomenon.
Anti-surge ring be one before and after the airflow direction symmetry, profile be concavo-convex alternate cirque body, be the part of tunnel with the propeller fan shell, be installed in the impeller blade position.The present invention includes outer ring, inner ring, annulus.The external diameter of annulus is consistent with the diameter of outer ring; The internal diameter of annulus is consistent with the diameter of inner ring.Outer ring quantity is between 2 and 5, and inner ring quantity lacks 1 than outer ring quantity, and number of rings is 2 times of inner ring quantity.The most common form of anti-surge ring is made up of 3 outer rings, 2 inner rings and 4 annulus.The external diameter end welding of one end of the 1st outer ring and the 1st annulus, the one end welding of the internal diameter end of the 1st annulus and the 1st inner ring, the internal diameter end welding of the other end of the 1st inner ring and the 2nd annulus, the one end welding of the external diameter end of the 2nd annulus and the 2nd outer ring, with this order, up to the external diameter end of the 4th annulus and the end welding of the 3rd outer ring, behind this anti-surge ring welding forming, at its rear and front end difference welded flange, so that be connected with the front and back shell of axial-flow blower.Constituted concave shaped space between the rear and front end of anti-surge ring and the flange.When matching with axial-flow blower, axial-flow fan blade top front and rear edge lays respectively at the concave shaped space position before and after the anti-surge ring, and the gap between vane tip and the inner ring plays the seal action of axial flow.
During axial-flow blower work, along with reducing of compressor flow, eddy current appears in place gradually in the axial-flow fan blade top inlet, and this eddy current constantly increases along with reducing of flow.But after axial-flow blower was equipped with anti-surge ring, this inlet vortex was positioned near the concave shaped space of anti-surge ring, and the concave shaped space of anti-surge ring will suppress the development of inlet vortex at this moment.So the generation of anti-surge ring deferrable blower fan surge does not even take place.When a certain axial-flow blower is carried out the performance comparison test, the axial-flow blower behind the anti-surge ring is housed, when flow reduced, the axial-flow blower that its wind pressure ratio is not adorned anti-surge ring had on average risen about 10%.Because anti-surge ring of the present invention is symmetrical before and after being, so in the bidirectional ventilated subway of needs, railway, vcehicular tunnel, when blower fan reverses, can produce same anti-surge effect.
The present invention is simple in structure, easy to process, the anti-surge effect is obvious, has remarkable social benefit and economic benefit.
Description of drawings
Fig. 1 is the structural representation of anti-surge ring of axial fan.
Fig. 2 is the stereogram of anti-surge ring,
1 is outer ring, the 2nd among the figure, annulus, the 3rd, inner ring, the 4th, flange, the 5th, concave shaped space, the 6th, blade.
Fig. 3 is the performance comparison diagram that propeller fan is installed the anti-surge ring front and back,
The curve of band " ◆ " number is the characteristic curve of fan that is unkitted anti-surge ring among the figure; The curve of band " ■ " number is the characteristic curve of fan behind the dress anti-surge ring.
Embodiment
Below in conjunction with accompanying drawing concrete enforcement of the present invention is further described:
As shown in Figure 1 and Figure 2, the present invention includes outer ring 1, annulus 2 and inner ring 3.The external diameter of annulus 2 is consistent with the diameter of outer ring 1; The internal diameter of annulus 2 is consistent with the diameter of inner ring 3.Outer ring 1 quantity is between 2 and 5, and inner ring 3 quantity lack 1 than outer ring 1 quantity, and annulus 2 quantity are 2 times of inner ring 3 quantity.The most common form of anti-surge ring is made up of 1,2 inner rings 3 in 3 outer rings and 4 annulus 2.The external diameter end welding of one end of the 1st outer ring 1 and the 1st annulus 2, the one end welding of the internal diameter end of the 1st annulus 2 and the 1st inner ring 3, the internal diameter end welding of the other end of the 1st inner ring 3 and the 2nd annulus 2, the one end welding of the external diameter end of the 2nd annulus 2 and the 3rd outer ring 1, with this order, up to the external diameter end of the 4th annulus 2 and the end welding of the 3rd outer ring 1, behind this anti-surge ring welding forming, at its rear and front end difference welded flange 4, so that be connected with the front and back shell of axial-flow blower.Constituted concave shaped space 5 between anti-surge ring rear and front end and the flange 4.When matching with axial-flow blower, the top front and rear edge of axial-flow fan blade 6 lays respectively at concave shaped space 5 positions before and after the anti-surge ring, and the gap between blade 6 tops and the inner ring 3 plays the seal action of axial flow.
Anti-surge ring of axial fan also can use the method for drawing except welding forming, hold forming die successfully by concavo-convex alternate shape earlier, presses required size cutting rectangle iron plate, is welded into flat annulus again, then rolling forming on forming die.
During axial-flow blower work, along with reducing of compressor flow, eddy current appears in 6 top inlet places gradually at axial-flow fan blade, and this eddy current constantly increases along with reducing of flow.But after axial-flow blower was equipped with anti-surge ring, this inlet vortex was positioned near the concave shaped space 5 of anti-surge ring, and the concave shaped space 5 of anti-surge ring will suppress the development of inlet vortex at this moment.So the generation of anti-surge ring deferrable blower fan surge does not even take place.As shown in Figure 3, when a certain axial-flow blower is carried out the performance comparison test, the axial-flow blower behind the anti-surge ring is housed, when flow reduced, the axial-flow blower that its wind pressure ratio is not adorned anti-surge ring had on average risen about 10%.Because anti-surge ring of the present invention is symmetrical before and after being, so in the bidirectional ventilated subway of needs, railway, vcehicular tunnel, when blower fan reverses, can produce same anti-surge effect.
Claims (3)
1. anti-surge ring of axial fan, be the part of tunnel with the propeller fan shell, it is characterized in that anti-surge ring is by outer ring (1), inner ring (3), annulus (2) is formed, symmetry before and after the airflow direction, profile is concavo-convex alternate cirque body, the external diameter of annulus (2) is consistent with the diameter of outer ring (1), the internal diameter of annulus (2) is consistent with the diameter of inner ring (3), outer ring (1) quantity is between 2 and 5, inner ring (3) quantity lacks 1 than outer ring (1) quantity, annulus (2) quantity is 2 times of inner ring (3) quantity, anti-surge ring is installed in leaf position, constituted concave shaped space (5) between its rear and front end and the flange (4), axial-flow fan blade (6) top front and rear edge lays respectively at concave shaped space (5) position before and after the anti-surge ring.
2. anti-surge ring of axial fan according to claim 1, it is characterized in that, anti-surge ring is often by 3 outer rings (1), 2 inner rings (3) and 4 annulus (2) are formed, the external diameter end welding of one end of the 1st outer ring (1) and the 1st annulus (2), the one end welding of the internal diameter end of the 1st annulus (2) and the 1st inner ring (3), the internal diameter end welding of the other end of the 1st inner ring (3) and the 2nd annulus (2), the one end welding of the external diameter end of the 2nd annulus (2) and the 2nd outer ring (1), with this order, up to the external diameter end of the 4th annulus (2) and the end welding of the 3rd outer ring (1), behind this anti-surge ring welding forming, at its rear and front end difference welded flange (4).
3. anti-surge ring of axial fan according to claim 1 is characterized in that anti-surge ring of axial fan also can use the rolling forming method, earlier hold forming die successfully by concavo-convex alternate shape, press required size cutting rectangle iron plate, be welded into flat annulus again, then rolling forming on forming die.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100236405A CN1313737C (en) | 2005-01-27 | 2005-01-27 | Anti-surge ring of axial fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100236405A CN1313737C (en) | 2005-01-27 | 2005-01-27 | Anti-surge ring of axial fan |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1644930A CN1644930A (en) | 2005-07-27 |
| CN1313737C true CN1313737C (en) | 2007-05-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100236405A Expired - Fee Related CN1313737C (en) | 2005-01-27 | 2005-01-27 | Anti-surge ring of axial fan |
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| CN (1) | CN1313737C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109340144A (en) * | 2018-10-15 | 2019-02-15 | 佛山冠博机械科技发展有限公司 | Multi-stage centrifugal fan |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104632715A (en) * | 2013-11-15 | 2015-05-20 | 鸿富锦精密工业（深圳）有限公司 | Fan |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4239452A (en) * | 1978-06-26 | 1980-12-16 | United Technologies Corporation | Blade tip shroud for a compression stage of a gas turbine engine |
| GB2158879A (en) * | 1984-05-19 | 1985-11-20 | Rolls Royce | Preventing surge in an axial flow compressor |
| US5707206A (en) * | 1995-07-18 | 1998-01-13 | Ebara Corporation | Turbomachine |
| CN2448969Y (en) * | 2000-11-08 | 2001-09-19 | 南通市同济申海大型风机有限公司 | Vibration-proof aixal-flow blower fan |
| CN2547926Y (en) * | 2002-06-25 | 2003-04-30 | 天津市通风机厂 | Anti-surge two-way axial-flow fan |
| CN1147666C (en) * | 2001-03-22 | 2004-04-28 | 上海交通大学 | Surge preventer for tunnel jet blower |
-
2005
- 2005-01-27 CN CNB2005100236405A patent/CN1313737C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4239452A (en) * | 1978-06-26 | 1980-12-16 | United Technologies Corporation | Blade tip shroud for a compression stage of a gas turbine engine |
| GB2158879A (en) * | 1984-05-19 | 1985-11-20 | Rolls Royce | Preventing surge in an axial flow compressor |
| US5707206A (en) * | 1995-07-18 | 1998-01-13 | Ebara Corporation | Turbomachine |
| CN2448969Y (en) * | 2000-11-08 | 2001-09-19 | 南通市同济申海大型风机有限公司 | Vibration-proof aixal-flow blower fan |
| CN1147666C (en) * | 2001-03-22 | 2004-04-28 | 上海交通大学 | Surge preventer for tunnel jet blower |
| CN2547926Y (en) * | 2002-06-25 | 2003-04-30 | 天津市通风机厂 | Anti-surge two-way axial-flow fan |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109340144A (en) * | 2018-10-15 | 2019-02-15 | 佛山冠博机械科技发展有限公司 | Multi-stage centrifugal fan |
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| Publication number | Publication date |
|---|---|
| CN1644930A (en) | 2005-07-27 |
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Granted publication date: 20070502 Termination date: 20140127 |