CN203201596U

CN203201596U - Flat angle brush type steam seal

Info

Publication number: CN203201596U
Application number: CN 201320069025
Authority: CN
Inventors: 张建华
Original assignee: 张建华
Current assignee: Jiangsu Turbine Power Technology Co., Ltd.
Priority date: 2013-02-06
Filing date: 2013-02-06
Publication date: 2013-09-18
Anticipated expiration: 2023-02-06

Abstract

The utility model relates to a flat angle brush type steam seal. A groove is formed in a labyrinth type steam seal body, a brush seal tooth component is embedded into the groove, the brush seal tooth component is sequentially provided with a front baffle, a brush wire bundle and a rear baffle in a tightened mode, and the front baffle, the brush wire bundle and the rear baffle are fixedly welded together. The flat angle brush type steam seal is composed of a plurality of arc sections, the butt joint surfaces of all the arc sections expect for the brush wire portions are radial planes, and the extending lines of all the planes are intersected at the center of the arc circle. The flat angle brush type steam seal eliminates protruded tips on the separation surface inside an air cylinder under the condition that the brush seal effect is not affected, and convenience is brought to installation and debugging. Meanwhile, all steam seal blocks will not be mutually restricted, radial free retraction can be achieved, friction, collision and abnormal vibration are reduced, safety operation performance is improved, and the brush seal effect is further guaranteed.

Description

Straight angle type brush steam seal

Technical field

The utility model relates to a kind of packing spare, in particular for the straight angle type brush steam seal in the high speed motive sealing.

Background technique

Be equipped with packing between known turbine rotor and stator, classical gland seal structure is labyrinth gland, and namely rotor machining becomes concaveconvex structure, and packing adopts the stage teeth structure to match with it.Packing generally is divided into 4～12 sections on whole circle, with adaptation level midsplit type cylinder body, slip into successively during installation in the T-shaped conduit of stator, and packing keeps certain interval with rotor under the support of spring sheet, can elastic yield in case bump the mill packing.

Brush steam seal grows up on common packing basis, namely one or several gland sealing gear of common packing is replaced with brush ring.Brush ring is comprised of compact arranged special alloy silk, when they and rotor are collided mill, brush silk can elastic yield, be difficult for being worn away, guaranteed the safe operation of unit under little gap even zero clearance, even if when unit is crossed critical speed of rotation and variable working condition, the brush silk also can be followed the axle yielding and but can not worn and not torn, after treating that unit is stable, recover again good sealability.

Because the nonuniformity effect in space between the brush silk, incoming flow enters in the brush tow and just becomes inhomogeneous uniformly, and from brushing closely the tow zone to loose brush tow zone bias current, these bias currents form concurrent and jet gradually between brush silk row, and produce random Secondary Flow and swirling flow.And run into the front and brush closely tow when a jet, will change moving direction and become the lateral flow vertical with main flow direction, i.e. cross flow.Just owing to destroy flowing, the brush tow guaranteeing the nonuniformity that flows, make fluid produce the selfsealings effect, it obviously is the self-packing significant contribution of convection cell that lateral flow replaces flowing forward, thereby it can make the overall presure drop of the brush that flow over increase the leakage that reduces sealing.

Brush seals special structure so that its sealability improves greatly, but in brush ring segmentation when cutting, is in order to guarantee to brush the integrity of silk and the continuity of arrangement, must cut along the bristle angle, form inevitably a spur in the casing split position like this, complicated structure brings some inconvenience to Installation and Debugging, simultaneously owing to the interaction because of the inclined-plane spur at the junction plane place of every segmental arc, whole circle packing is connected as a single entity, lose the design philosophy that each segmental arc can elastic yield, can cause abnormal vibrations.

The model utility content

Make the problem that each segmental arc can not free elastic yield in order to overcome existing brush steam seal because of the interaction of inclined-plane spur, the utility model provides a kind of straight angle type brush steam seal, this straight angle type brush steam seal has been eliminated its spur in the casing split position when being sealed effect not affecting brush, bring convenience to Installation and Debugging, every gland blocks can not restrict mutually simultaneously, can both realize radially freely making a concession, reduced and bumped mill and abnormal vibrations, improved the performance of safe operation, and then guaranteed that brush is sealed the envelope effect.

The technological scheme that its technical problem that solves the utility model adopts is: have groove at the labyrinth gland body, the embedded brush envelope tooth member that is placed with of groove, fastening front screen, brush tow and the backboard arranged of described brush envelope tooth component order, described front screen, backboard and brush tow are fixed and welded together, the brush tow is the high-temperature alloy silk of 0.05-0.12, and brush tow thickness is 1mm-2mm.

Brush steam seal is comprised of some segmental arcs, the interface of each segmental arc remains the radial plane except brush silk part, the elongation line on each plane all intersects at the central point of this arc circle, segmental arc I and segmental arc IV adopt the gradient wire-arrangement structure at the horizontal flange place, radially brush an inclination angle in the split position and gradually become 0 °, relatively coordinate in order to guarantee gradient wire-arrangement, steam seal ring brush silk inclination angle all remains on than small inclination, the brush silk of segmental arc II and segmental arc V is radially pressed fixed angle and is arranged, and segmental arc III and segmental arc VI are 0 ° gradually at brush silk inclination angle, horizontal flange place.Still radially press fixed angle away from the brush silk of split and arrange, segmental arc can be the 2N section, and N is nonnegative integer.

Also can make brush silk on each segmental arc keep the inclination angle of fixing; when cutting process, labyrinth casing all radially is cut into the plane together with the front and rear baffle of brushing silk; only have part brush silk to protrude; because the elasticity of brush silk self; can mutually not restrict in each segmental arc of binding site; can elastic yield, install with transportation process in, the brush silk of protrusion can well be protected with protecting jacket.

During use, brush envelope tooth member is packed into fixing in groove corresponding to labyrinth casing, make free end and the rotor shaft Surface Contact of brush silk, it can adapt to the moment radial deformation or eccentric motion of rotor shaft, therefore can accomplish to reduce under the premise that security is guaranteed seal clearance as far as possible, owing to having increased the rotor shaft vibration damping, be conducive to improve the stability of rotor shaft simultaneously.Simultaneously, the high pressure incoming flow enters in the brush tow and just becomes inhomogeneous uniformly, and from brushing closely the tow zone to the regional bias current of loose brush tow, these bias currents decompression between brush silk row also forms concurrent and jet gradually, and produce random Secondary Flow and swirling flow, air pressure is lowered.And run into the front and brush closely tow when a jet, will change moving direction and become the lateral flow vertical with main flow direction, i.e. cross flow.Just owing to destroy flowing, the brush tow guaranteeing the nonuniformity that flows, make fluid produce the selfsealings effect, it obviously is the self-packing significant contribution of convection cell that lateral flow replaces flowing forward, and it can make the overall presure drop of the brush that flow over increase, thereby reaches the purpose that reduces seal leakage.

The beneficial effects of the utility model are, this straight angle type brush steam seal has been eliminated its spur in the casing split position when being sealed effect not affecting brush, bring convenience to Installation and Debugging, every gland blocks can not restrict mutually simultaneously, can both realize that radial elastic freely makes a concession, reduced and bumped mill and abnormal vibrations, improved the performance of safe operation, and then guaranteed that brush is sealed the envelope effect.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1 is structural principle schematic diagram of the present utility model.

Fig. 2 is brush envelope tooth element structure schematic diagram.

Fig. 3 is brush envelope split gradient wire-arrangement structural representation.

Among the figure, 1. labyrinth casing, 2. gland sealing gear, 3. backboard, 4. solder joint, 5. front screen, 6. brush tow, 7. segmental arc I, 8. segmental arc II, 9. segmental arc III, 10. segmental arc IV, 11. segmental arc V, 12. segmental arc VI.

Embodiment

In the drawings, have groove at labyrinth gland body 1, the embedded brush envelope tooth member that is placed with of groove, fastening front screen 5, brush tow 6 and the backboard 3 arranged of described brush envelope tooth component order, described front screen 5, backboard 3 and brush tow 6 are fixed and welded together, brush tow 6 is the high-temperature alloy silk of 0.05-0.12, and brush tow 6 thickness are 1mm-2mm.

Brush steam seal is comprised of some segmental arcs, the interface of each segmental arc remains the radial plane except brush silk part, the elongation line on each plane all intersects at the central point of this arc circle, segmental arc I 7 and segmental arc IV 10 adopt the gradient wire-arrangement structure at the horizontal flange place, radially brush an inclination angle in the split position and gradually become 0 °, relatively coordinate in order to guarantee gradient wire-arrangement, steam seal ring brush silk inclination angle all remains on than small inclination, the brush silk of segmental arc II 8 and segmental arc V 11 is radially pressed fixed angle and is arranged, and segmental arc III 9 and segmental arc VI 12 are 0 ° gradually at brush silk inclination angle, horizontal flange place.Still radially press fixed angle away from the brush silk of split and arrange, segmental arc can be the 2N section, and N is nonnegative integer.

During use, brush envelope tooth member is packed into fixing in the groove of labyrinth casing 1 correspondence, make free end and the rotor shaft Surface Contact of brush silk, it can adapt to the moment radial deformation or eccentric motion of rotor shaft, therefore can accomplish to reduce under the premise that security is guaranteed seal clearance as far as possible, owing to having increased the rotor shaft vibration damping, be conducive to improve the stability of rotor shaft simultaneously.Simultaneously, the high pressure incoming flow enters in the brush tow 6 and just becomes inhomogeneous uniformly, and from brushing closely tow 6 zones to loose brush tow 6 regional bias currents, these bias currents decompression between brush silk row also forms concurrent and jet gradually, and produce random Secondary Flow and swirling flow, air pressure is lowered.And run into the front and brush closely tow 6 when a jet, will change moving direction and become the lateral flow vertical with main flow direction, i.e. cross flow.Just owing to destroying to flow, brush tow 6 guaranteeing the nonuniformity that flows, make fluid produce the selfsealings effect, it obviously is the self-packing significant contribution of convection cell that lateral flow replaces flowing forward, and it can make the overall presure drop of the brush that flow over increase, thereby reaches the purpose that reduces seal leakage.

Claims

1. Straight angle type brush steam seal, have groove at labyrinth gland body 1, the embedded brush envelope tooth member that is placed with of groove, fastening front screen 5, brush tow 6 and the backboard 3 arranged of described brush envelope tooth component order, described front screen 5, backboard 3 and brush tow 6 are fixed and welded together, brush tow 6 is the high-temperature alloy silk of 0.05-0.12, brush tow 6 thickness are 1mm-2mm, brush steam seal is comprised of some segmental arcs, it is characterized in that, the interface of each segmental arc remains the radial plane except brush silk part, the elongation line on each plane all intersects at the central point of this arc circle.

2. Straight angle type brush steam seal according to claim 1, it is characterized in that, segmental arc I (7) and segmental arc IV (10) adopt the gradient wire-arrangement structure at the horizontal flange place, radially brush an inclination angle in the split position and gradually become 0 °, steam seal ring brush silk inclination angle all remains on than small inclination, the brush silk of segmental arc II (8) and segmental arc V (11) is radially pressed fixed angle and is arranged, and segmental arc III (9) and segmental arc VI (12) are 0 ° gradually at brush silk inclination angle, horizontal flange place; Still radially press fixed angle away from the brush silk of split and arrange, segmental arc can be the 2N section, and N is nonnegative integer.