CN103498705A - Low-wear brush type seal - Google Patents
Low-wear brush type seal Download PDFInfo
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- CN103498705A CN103498705A CN201310492978.XA CN201310492978A CN103498705A CN 103498705 A CN103498705 A CN 103498705A CN 201310492978 A CN201310492978 A CN 201310492978A CN 103498705 A CN103498705 A CN 103498705A
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- brush
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- gap
- tow
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- Turbine Rotor Nozzle Sealing (AREA)
Abstract
A low-wear brush type seal comprises a front baffle, a rear baffle and a brush wire bundle. The root portion of the brush wire bundle is clamped by the front baffle and the rear baffle, the brush wire bundle is blown down and is in contact with a rotor under upstream pressure, brush wires of a brush wire area are not flush in the radial direction of the rotor, and the lengths of the brush wires of the downstream of the brush wire bundle are smaller than those of the brush wires on the upstream, namely seen from the axial-radial plane of the rotor 5, the downstream free end of the brush wire bundle 3 exists; initial gaps between the downstream brush wires and the rotor 5 are larger than those between the upstream brush wires and the rotor 5, notches can specifically reduce wear friction between the brush wire bundle 3 and the rotor 5, and the downstream brush wires can still be blown off under pressure differences and make slight contact with the rotor or maintain a small gap with the rotor, so that leakage amount is not increased obviously. According to the low-wear brush type seal, contact force between the downstream brush wires and the rotor is specifically reduced, and wear between the brush wires and the rotor is greatly reduced.
Description
Technical field
The invention belongs to the mechanical sealing technology field, particularly can reduce the brush seal of a kind of low wearing and tearing of brush tow and rotor wearing and tearing.
Background technique
In turbomachine especially aeroengine, often need to be sealed the different pressures chamber, and the seal form between revolving part and static element has the sealing of castor tooth and brush seal usually.The sealing of castor tooth is a kind of noncontact seal, in order to ensure sealing castor tooth and not failure interference of revolving part, sizable gap is generally arranged between castor tooth and revolving part, and this causes leakage rate larger.And brush seal is a kind of seal form of flexible contact, its leakage rate is the 1/5-1/10 of castor tooth sealing, and the serious decentraction of transient state and keep sealability constant between the permission sound, not only having improved unit efficiency but also improved the stability of rotor, is one of key technology of modern advanced turbine engine development.Brush seal has been applied to the turbomachines such as aeroengine, industry gas turbine and steam turbine.At aviation field, the application brush seal is the important means that improves aero-engine performance, in the technological innovation of each large turbine company of the worlds such as GE, Siemens and development, all one of using the brush seal technical research as important content wherein.
But, brush seal is a kind of contact seal, the gap that fretting wear between brush tow and rotor not only can cause brushing between tow and rotor increases, more may cause obvious fretting wear and produce obvious frictional heat rotor, affect stability and the Security of rotor operation, reduce the reliability of brush silk.The contact friction of brush tow and rotor mainly stems from interference assembling and the brush silk of brushing tow and rotor and " is blown down (blow down) " and rotor generation contact force under differential pressure action, and then causes the wearing and tearing between brush silk and rotor.Brush tow and rotor are generally little gap or ideal contacts cooperation, and pressure reduction is the principal element that causes brushing the fretting wear of tow and rotor like this.The means that reduce at present brush tow and the fretting wear (or reducing the impact that this fretting wear brings) of rotor mainly contain the brush tow of selecting low coefficient of friction and rotor pairing material, in rotor surface coating wear resistant friction reducing coating.
It is contemplated that, if can set about from origin, the brush tow that reduces to be caused by pressure reduction and the contact force between rotor, and then reduce the fretting wear between brush tow and rotor, inevitable meaningful greatly.Calculate and be from upstream to each row brush silk in downstream in the brush tow and the contact force between rotor shows by computational fluid mechanics (CFD) and the stressed theory of overhang (will brush silk and be reduced to overhang), the brush silk caused by air-flow power in traditional brush seal and the contact force of rotor have following rule, with reference to figure 1: the contact force of downstream brush silk and rotor obviously is greater than the contact force of upstream brush thread.If can reduce targetedly the contact force between downstream brush silk and rotor, should greatly reduce the wearing and tearing between brush silk and rotor.
Summary of the invention
In order to overcome the defect of prior art, the objective of the invention is at existing brush seal technical, propose pointedly to reduce the brush seal of a kind of low wearing and tearing of brushing tow and rotor wearing and tearing, reduce targetedly the contact force between downstream brush silk and rotor, greatly reduce the wearing and tearing between brush silk and rotor.
In order to achieve the above object, technological scheme of the present invention is:
A kind of brush seal of low wearing and tearing, comprise front screen 1, backboard 2, brush tow 3, the root 4 of brush tow 3 is by front screen 1 and backboard 2 clampings, brush tow 3 " is blown down " with rotor 5 and is contacted under upstream pressure, the brush silk in Shua Si district 3 is not concordant rotor 5 in the radial direction, the length of some, the downstream of described brush tow 3 brush silk is short than upstream brush silk, from rotor 5 axially-radial plane, there is gap 31 in the downstream free end of brush tow 3.
Described gap 31 rotor 5 axially-be seen as triangle on radial plane, the scope of the angle beta of described leg-of-mutton gap is the 0-45 degree, the scope of maximum height h is 0-1mm, axially overall dimensions t is no more than half of the axial total thickness of brush tow.
Described gap 31 rotor 5 axially-be seen as rectangle on radial plane, the scope of the height h of the gap of described rectangle is 0-1mm, axially overall dimensions t is no more than half of the axial total thickness of brush tow.
Described gap 31 rotor 5 axially-to be seen as the downstream radial dimension on radial plane large, the polygonal that the upstream radial dimension is little, the scope of the maximum height h of described polygonal gap is 0-1mm.
Described gap 31 rotor 5 axially-to be seen as the downstream radial dimension on radial plane large, the curved line trangle that the upstream radial dimension is little or bent limit polygonal, the scope of the maximum height h of described bent limit polygonal gap is 0-1mm.
Beneficial effect of the present invention is: the brush tow 3 of inventing the brush seal of described structure is significantly less than existing brush seal structure with contact force, fretting wear and the frictional heat of rotor 5, can improve fretting wear and heating between brush tow 3 and rotor 5, improve stability and the Security of rotor operation, improve the reliability of brush silk.Undeniable is that the brush seal of inventing described structure can need to be weighed according to actual needs a little more than existing brush seal structure on leakage rate, and the present invention is more suitable for the higher occasion of stability, security requirement to rotor.
The accompanying drawing explanation
The schematic diagram that Fig. 1 is the single brush silk of respectively arranging of brush seal contact force;
The front view that Fig. 2 A is the brush seal structure.
The side view that Fig. 2 B is the brush seal structure.
The partial enlarged view of the side view that Fig. 2 C is the brush seal structure.
The structural representation that Fig. 3 A is the embodiment of the present invention 1.
The partial enlarged view of the structure that Fig. 3 B is the embodiment of the present invention 1.
The structural representation that Fig. 4 A is the embodiment of the present invention 2.
The partial enlarged view of the structure that Fig. 4 B is the embodiment of the present invention 2.
Embodiment
The invention provides a kind of brush seal structure that reduces the low wearing and tearing of brush tow and rotor wearing and tearing.Below in conjunction with accompanying drawing explanation and embodiment, the present invention will be further described.
With reference to Fig. 2 A, 2B and 2C, a kind of brush seal of low wearing and tearing, comprise front screen 1, backboard 2, brush tow 3, the root 4 of brush tow 3 is by front screen 1 and backboard 2 clampings, between backboard 2 and rotor 5, certain gap is arranged, guarantee that rotor 5 can not interfere with backboard 2 under eccentric and the state of beating, can not cause very large leakage again simultaneously, brush tow 3 by backboard 2, is supported under upstream pressure and " being blown down " contacts to play sealing effect with rotor 5, hinders sealed flowing medium and is from upstream to the downstream leakage.
Embodiment one
The schematic diagram that is the embodiment of the present invention 1 with reference to Fig. 3, the brush seal structure comprises front screen 1, backboard 2, brush tow 3, the root 4 of brush tow 3 " is blown down " with rotor 5 and is contacted to play sealing effect with backboard 2 clamping brush tow 3 by front screen 1 under upstream pressure, hinders sealed flowing medium and is from upstream to the downstream leakage.Wherein the brush silk in ，Shua Si district 3 rotor 5 be not concordant in the radial direction, the length of some, the downstream of described brush tow 3 brush silk is short than upstream brush silk, from rotor 5 axially-radial plane, there is gap 31 in the downstream free end of brush tow 3; Described gap 31 rotor 5 axially-be seen as triangle (with reference to figure 3) on radial plane, the scope of the angle beta of described triangle notch is the 0-45 degree, the scope of maximum height h is 0-1mm, and axially overall dimensions t is no more than half of the axial total thickness of brush tow;
Embodiment two
The schematic diagram that Fig. 4 is the embodiment of the present invention 2, the brush seal structure comprises front screen 1, backboard 2, brush tow 3, the root 4 of brush tow 3 is by front screen 1 and backboard 2 clampings, brush tow 3 " is blown down " with rotor 5 and is contacted to play sealing effect under upstream pressure, hinders sealed flowing medium and is from upstream to the downstream leakage.Wherein the brush silk in ，Shua Si district 3 rotor 5 be not concordant in the radial direction, the length of some, the downstream of described brush tow 3 brush silk is short than upstream brush silk, from rotor 5 axially-radial plane, there is gap 31 in the downstream free end of brush tow 3; Described gap 31 rotor 5 axially-be seen as rectangle (with reference to figure 4) on radial plane, the scope of the height h of described rectangle gap is 0-1mm, axially overall dimensions t is no more than half of the axial total thickness of brush tow;
Preliminary calculating shows, under equal operating mode, the present embodiment (t=0.3mm, h=0.4mm, brush tow total thickness 1.5mm) than the brush seal of existing structure, can make downstream brush silk reduce approximately 10%～%15 with the contact force of rotor, and the leakage rate increase is no more than 20%.
Working principle of the present invention is: for brushing the characteristic distributions of tow 3 with the rotor contact force, (downstream brush silk contact force is much larger than a upstream brush contact force, with reference to figure 1), by the downstream design gap structure 31 at brush tow 3, making has larger primary clearance with respect to upstream brush silk between downstream brush silk and rotor 5, can reduce targetedly like this fretting wear between brush tow 3 and rotor 5, and downstream brush silk under pressure reduction, still can be blown off (blow down) slighter with the rotor generation contact or maintain a little gap, thereby unlikely obvious increase leakage rate.
Claims (5)
1. one kind is hanged down the brush seal worn and torn, it is characterized in that, comprise front screen (1), backboard (2), brush tow (3), the root (4) of brush tow (3) is by front screen (1) and backboard (2) clamping, brush tow (3) " is blown down " with rotor (5) under upstream pressure to be contacted, the brush silk in Shua Si district (3) is not concordant rotor (5) in the radial direction, the length of the some brush silks in the downstream of described brush tow (3) is short than upstream brush silk, from rotor (5) axially-radial plane, there is gap (31) in the downstream free end of brush tow (3).
2. the brush seal of a kind of low wearing and tearing according to claim 1, it is characterized in that, described gap (31) rotor (5) axially-be seen as triangle on radial plane, the scope of the angle beta of described leg-of-mutton gap is the 0-45 degree, the scope of maximum height h is 0-1mm, and axially overall dimensions t is no more than half of the axial total thickness of brush tow.
3. the brush seal of a kind of low wearing and tearing according to claim 1, it is characterized in that, described gap (31) rotor (5) axially-be seen as rectangle on radial plane, the scope of the height h of the gap of described rectangle is 0-1mm, and axially overall dimensions t is no more than half of the axial total thickness of brush tow.
4. the brush seal of a kind of low wearing and tearing according to claim 1, it is characterized in that, described gap (31) rotor (5) axially-be seen as the polygonal that the downstream radial dimension is large, the upstream radial dimension is little on radial plane, the scope of the maximum height h of described polygonal gap is 0-1mm.
5. the brush seal of a kind of low wearing and tearing according to claim 1, it is characterized in that, described gap (31) rotor (5) axially-to be seen as the downstream radial dimension on radial plane large, the curved line trangle that the upstream radial dimension is little or bent limit polygonal, the scope of the maximum height h of described bent limit polygonal gap is 0-1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310492978.XA CN103498705A (en) | 2013-10-18 | 2013-10-18 | Low-wear brush type seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310492978.XA CN103498705A (en) | 2013-10-18 | 2013-10-18 | Low-wear brush type seal |
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| Publication Number | Publication Date |
|---|---|
| CN103498705A true CN103498705A (en) | 2014-01-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310492978.XA Pending CN103498705A (en) | 2013-10-18 | 2013-10-18 | Low-wear brush type seal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109899526A (en) * | 2019-04-11 | 2019-06-18 | 广州市挂绿环保工程有限公司 | A kind of rotary sealing structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5201530A (en) * | 1991-10-18 | 1993-04-13 | United Technologies Corporation | Multi-layered brush seal |
| US5630590A (en) * | 1996-03-26 | 1997-05-20 | United Technologies Corporation | Method and apparatus for improving the airsealing effectiveness in a turbine engine |
| US20050006851A1 (en) * | 2003-07-09 | 2005-01-13 | Addis Mark E. | Brush seal with windage control |
| CN102296994A (en) * | 2011-08-03 | 2011-12-28 | 上海电气电站设备有限公司 | Manufacturing technique for brush type steam seal for steam turbines |
-
2013
- 2013-10-18 CN CN201310492978.XA patent/CN103498705A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5201530A (en) * | 1991-10-18 | 1993-04-13 | United Technologies Corporation | Multi-layered brush seal |
| US5630590A (en) * | 1996-03-26 | 1997-05-20 | United Technologies Corporation | Method and apparatus for improving the airsealing effectiveness in a turbine engine |
| US20050006851A1 (en) * | 2003-07-09 | 2005-01-13 | Addis Mark E. | Brush seal with windage control |
| CN102296994A (en) * | 2011-08-03 | 2011-12-28 | 上海电气电站设备有限公司 | Manufacturing technique for brush type steam seal for steam turbines |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109899526A (en) * | 2019-04-11 | 2019-06-18 | 广州市挂绿环保工程有限公司 | A kind of rotary sealing structure |
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Application publication date: 20140108 |