CN207879400U - A kind of intensive tooth brush steam seal - Google Patents

Abstract

The utility model is related to a kind of sealing glands, and in particular to a kind of intensive tooth brush steam seal.A kind of intensive tooth brush steam seal, it is formed by multistage labyrinth ring is end to end, every section of labyrinth ring includes labyrinth casing and gland sealing gear, the gland sealing gear is arranged on the inner peripheral surface of labyrinth casing, the gland sealing gear includes high tooth sealing strip and low tooth sealing strip, the high tooth sealing strip at least two is provided at least three low tooth sealing strips between the adjacent high tooth sealing strip, the position of low tooth sealing strip and/or high tooth sealing strip is provided at least one brush ring.The utility model provides a kind of good seal performance, adapts to the moment radial deformation of rotor or the packing of eccentric motion, minimizes seal clearance under the premise that security is guaranteed, increases the damping action of packing, the operation more stabilized the economy conducive to unit.

Description

A kind of intensive tooth brush steam seal

Technical field

The utility model is related to a kind of sealing glands, and in particular to a kind of intensive tooth brush steam seal.

Background technology

The characteristics of belonging to " technology-intensive type " industry based on thermal power generation corporations, for the protrusion lance in enterprise's current development Shield, using theory as foundation, illustrate Steam Turbine there are the problem of, improve the direction of overall performance, implement the technology of comprehensive reformation Thought, route, method, measure and scheme." high investment, high consumption, maximum discharge, difficulty are always existed in thermal power generation corporations' development The problem of cycle, poor efficiency ".How being transformed and then improving economic performance is that the reality put in face of corporate decision maker is asked Topic.

Research and propose the concept of the through-flow portion of steam turbine " the effective tooth of packing ", packing refer to gland sealing gear of different shapes with it is corresponding By structure combination at sealing, the main aspect of principal contradiction is rotating part by the structure at sealing.To reduce working medium Leakage rate, Design of Steam Turbine person are the structure and features according to steam turbine, it is first determined rotor is by surface texture at sealing, then matches Corresponding gland sealing gear and mounting structure are covered, if cannot be transformed by the structure at sealing to turbine rotor, only to gland sealing gear Structure type replaced, for effect compared with using former packing, it is very limited to improve economical.In addition, working as steamer The design feature and rotating part of machine by the structure of sealing surfaces once it is determined that, the factor size for influencing sealing effect is distinguished successively For：" packing " inlet outlet pressure differential, by sealing packing effective length, rotating part is by the number of structure, effective tooth at sealing Amount, the structure type of gland blocks design, mounting process, gland sealing gear and installation gap etc..

It is the quantity and gland blocks structure design, mounting process of effective tooth that active service steam turbine influence factor is maximum.Packing Block is transformed or packing tooth pattern is replaced, and popular can liken Yi Tiaohe to, and why some section river surface flows are very tranquil, and some Whirlpool more flow in section is larger.Packing transformation or the replacement of packing tooth pattern are exactly substantially every possible means in river channel, Hole how is deep-cut, more whirlpools is made, pecks more, makes the wave of bigger.In addition, due to influencing steam turbine effect There are many economic factors such as rate, coal consumption and the steam consumption, and the leakage of the wherein through-flow dynamic and static leaf packing of steam turbine and axle envelope is to lead to steam turbine The major reason that efficiency reduces, especially turbine parameters are higher and higher, under identical seal clearance, pass through interstage gland steam Density increases, and mass flow increases.Leakage vapour not only bypasses and is possible to work done in dynamic (quiet) leaf, but also causes next stage sprue Sorrow is dynamic, and double negative effect seriously affects stage efficiency.By taking vapour 300MW units on home-made imported type as an example, in intermediate gap bridge packing Leakage rate design value be 20.8 ton hours；Other 300MW units below, due to by pervious technology and production technology Influence, leakage rate ratio is with regard to bigger.It can be seen that the leakage rate of steam turbine is very big, it is also to improve potentiality very much Big.

Most common steam seal ring is still comb-tooth-type structure to modern steam turbine at present, and the work of the steam seal ring of comb-tooth-type structure is former Reason is to force a fluid through tortuous approach to successively decrease its pressure to reduce leakage, and in assembly, labyrinth ring is by being placed on packing The spring pressure at arc block back is tightened to design position, and when gland sealing gear and Rub-impact, labyrinth ring has certain yielding, unlikely tight Axis and labyrinth ring are damaged again, but cannot prevent from rubbing.In recent years, various new vapour is introduced from abroad with the development of technology Envelope, more typically such as:Contact packing, side tooth packing, Honeycomb steam seal etc., but that there are still sealing performances is bad, and leakage rate is big, The deficiencies of axis easily vibrates, easy damaged.

Utility model content

In order to overcome the shortcoming of above-mentioned existing steam seal ring, the utility model to provide a kind of good seal performance, adapt to The moment radial deformation of rotor or the packing of eccentric motion minimize seal clearance under the premise that security is guaranteed, increase vapour The damping action of envelope, the operation more stabilized the economy conducive to unit.The technical solution adopted in the utility model is：

A kind of intensive tooth brush steam seal, is formed, every section of labyrinth ring includes labyrinth casing and vapour by multistage labyrinth ring is end to end Tooth is sealed, the gland sealing gear is arranged on the inner peripheral surface of labyrinth casing, and the gland sealing gear includes high tooth sealing strip and low tooth sealing strip, The high tooth sealing strip at least two is provided at least three low tooth sealing strips between the adjacent high tooth sealing strip, The position of low tooth sealing strip and/or high tooth sealing strip is provided at least one brush ring.

Further, the low tooth sealing strip between the adjacent high tooth sealing strip is uniformly arranged.

Further, the distance D between adjacent two low tooth sealing strips in an axial direction is less than or equal to 3mm.

Further, the crown thickness of the high tooth sealing strip and the low tooth sealing strip is less than 0.2mm.

Further, the brush ring includes first clamping plate, second clamping plate and brush filament, and one end of the brush filament is installed in first Between clamping plate and second clamping plate.

Further, conduit is provided on the labyrinth casing, the brush ring is embedded in the conduit.

Further, be provided with conduit on the labyrinth casing, the conduit is in " Г " or " Т " shape, the shape of the brush ring with The shape of conduit is adapted, and the brush ring slides into the conduit.

Further, it is additionally provided with the threaded hole communicated with conduit on the labyrinth casing.

Further, the brush filament is heat safe B alloy wire, and the diameter of section of the brush filament is 0.05~0.2mm, firmly Degree is more than or equal to 800Mpa more than or equal to 80HB, tensile strength.

Further, the angle between the tangent line of the corresponding position of the brush filament and labyrinth casing inner peripheral surface is 20-60 degree.

Based on the above-mentioned technical proposal, the beneficial effects of the utility model are：

1. the intensive tooth brush steam seal good seal performance of the utility model, the number density for carrying stage teeth sealing strip adapt to The radially, axially moment of rotor beats, and prevents the axial float due to rotor from causing wrong between low tooth sealing strip and rotor boss Position, does not have sealing effect, and intensive low tooth sealing strip causes air flow through the multiple throttling expansion decompression of small chamber；

2. the intensive tooth brush steam seal of the utility model uses brush ring structure, it is further ensured that the sealing performance of packing；And Material and angle to the brush ring carry out certain restriction, ensure during the work time, brush ring will not countershaft damaged；

3. the labyrinth casing of the intensive tooth brush steam seal of the utility model is provided with threaded hole, can be arranged in the threaded hole Adjusting screw, it is convenient that the position of brush ring is adjusted；

4. the brush ring of the intensive tooth brush steam seal of the utility model using setting in " Г " or " Т " shape conduit, and brush ring Shape and the shape of conduit are adapted, and ensure that complex loop is not fallen out packing in use in this way.

Description of the drawings

Fig. 1 is the structural schematic diagram of the intensive tooth brush steam seal in the embodiments of the present invention one and embodiment two；

Fig. 2 is the A-A schematic diagrames of Fig. 1 in the embodiments of the present invention one；

Fig. 3 is the A-A schematic diagrames of Fig. 1 of the embodiments of the present invention two；

In figure：1- labyrinth rings；11- labyrinth casings；12- gland sealing gears；121- high tooth sealing strips；The low tooth sealing strips of 122-；13- is brushed Ring；131- first clamping plates；132- second clamping plates；133- brush filaments；14- threaded holes.

Specific implementation mode

The content of the utility model is further described with reference to the accompanying drawings of the specification.

Embodiment one

Referring to Figure of description 1-2, a kind of intensive tooth brush steam seal is formed, multistage vapour by multistage labyrinth ring 1 is end to end Seal ring 1 constitutes annular shape, and the quantity of the labyrinth ring 1 is even number.Every section of labyrinth ring 1 includes labyrinth casing 11 and gland sealing gear 12, the gland sealing gear 12 is arranged on the inner peripheral surface of labyrinth casing 11, and the gland sealing gear 12 includes high tooth sealing strip 121 and low tooth Sealing strip 122 is provided at least one brush ring 13 in the position of low tooth sealing strip (122) and/or high tooth sealing strip (121).

The quantity of the high tooth sealing strip 121 is at least 2, and the particular number of the high tooth sealing strip 121 depending on matching therewith Depending on the number of recesses of the outer surface of the shaft of conjunction, each groove of shaft outer surface corresponds to 1 high tooth sealing strip 121.It is adjacent Two high tooth sealing strip 121 between be provided with multiple low tooth sealing strips 122, the low tooth sealing strip 122 corresponds to shaft appearance The raised position in face is arranged, it is preferable that is provided with the low tooth sealing strip of at least three between adjacent two high tooth sealing strip 121 122.The low tooth sealing strip 122 being arranged between adjacent two high tooth sealing strip 121 is uniformly arranged.The intensive tooth of the utility model Brush steam seal, low tooth sealing strip 122 prevent the axial float due to rotor from leading to low tooth sealing strip and rotor boss than comparatively dense Between misplace, form larger leakage path, intensive low tooth sealing strip causes air flow through the multiple throttling expansion decompression of small chamber, Sealing effect is good.

In order to ensure the sealing effect of packing, the utility model between two adjacent low tooth sealing strips 122 in an axial direction Gap be defined, the distance between two adjacent low tooth sealing strips 122 in an axial direction be D, D be less than or equal to 3mm. In addition, the utility model is also defined the crown thickness of high tooth sealing strip and low tooth sealing strip, the high tooth sealing strip 121 and low tooth sealing strip 122 crown thickness be less than 0.2mm.

The brush ring 13 includes first clamping plate 131, second clamping plate 132 and brush filament 133, the first clamping plate 131 and second Clamping plate 132 is located at the both sides of the brush filament 133, and one end of the brush filament 133 is installed in first clamping plate 131 and second clamping plate Between 132.Conduit is provided on the labyrinth casing 11, the brush ring 13 is embedded in the conduit.In addition, the brush filament 133 is in one Fixed angle setting, after the installation in the channel of the brush ring 13, the labyrinth casing 11 of brush filament 133 and its position in brush ring 13 Angle between the tangent line of inner peripheral surface is 20-60 degree, reduces the resistance of countershaft rotation.The brush filament 133 is high temperature resistant B alloy wire, the hardness of the brush filament is more than or equal to 80HB, tensile strength is more than or equal to 800Mpa, and thickness is not less than 1.5mm.It is excellent Selection of land, the brush filament are cylindric, and the diameter of section of brush filament is 0.05~0.2mm.

By on labyrinth ring the high tooth sealing strip in part or/and low tooth sealing strip be changed to embedded brush ring, due to brush ring master It to be made of compact arranged flexible and heat safe thin B alloy wire, there is fabulous elasticity.When packing and rotor collide mill, Brush filament can be with elastic yield, this ensure that safe operation of the unit under small―gap suture even zero clearance.Again due to brush filament gap Inhomogeneities, so that uniform incoming is entered in brush wire bundle just becomes uneven, and from close brush wire bundle region to dredge The brush wire bundle region bias current of pine, these bias currents gradually form concurrent and jet stream between brush filament row, and generate at random secondary Stream and bumpy flow, and work as a jet stream and encounter the close brush wire bundle in front, the direction of motion will be changed and become to hang down with main flow direction Straight lateral flow, i.e. transverse flow, just since the transverse flow that brush wire bundle can generate can make fluid produce self sealss effect, its energy The overall presure drop for flowing transversely through brush is set to increase to be further reduced leakage.

Embodiment two

As shown in figures 1 and 3, the present embodiment and embodiment one are essentially identical, differ only in brush ring 13 and labyrinth casing 11 Connection type.Conduit is provided on labyrinth casing 11, the conduit is in " Г " or " Т " shape for placing brush ring 13, the conduit, The shape of the brush ring 13 and the shape of conduit are adapted, and the brush ring 13 is mounted on by the way of sliding on labyrinth casing 11, Clearance fit between the conduit and the brush ring 13, therefore the brush ring 13 on the labyrinth casing 11 to a certain extent may be used With movable in conduit, the position of adjustment brush filament 133.

In addition threaded hole 14 identical with the conduit is additionally provided on labyrinth casing 11, the threaded hole 14 is adjusted for placing Screw is saved, the adjusting screw adjusts the scope of activities of brush ring 13 by being moved in threaded hole 14.The preferably described screw thread Hole 14 extends in a radial direction on labyrinth casing 11, facilitates the placement of adjusting screw.

Preferably, cylindrical spring is additionally provided between the adjusting screw and brush ring 13, cylindrical spring uses high temperature resistant, soft Property preferably special spring, it is ensured that rotor is beated in unit running process, and brush ring can effectively be made a concession.Work as rotor in this way When vibration, brush ring can effectively be made a concession, therefore shaft will not be caused to generate heat, and grind axis phenomenon, shafting will not be caused to shake It is dynamic, it is ensured that sealing effect.

Experiments have shown that the steam loss of intensive tooth brush steam seal of the invention is only the 10%~20% of former serrate-type steam seal. Intensity after welding is more taller than wire intensity itself, phenomena such as will not falling thread, has good seal performance and structure letter The advantages that single reasonable, the speed which can bear are more than 305 meter per seconds, heatproof up to 690 DEG C or more, It can long-term, stable, safe operation.Large rotor mechanical equipment can be suitble to make dynamic sealing use, be particularly suitable for existing steam turbine Dynamic sealing carry out replace upgrading use.

The embodiment of the utility model is explained in detail above in conjunction with attached drawing, but the utility model is not limited to The above embodiment can also not depart from the utility model within the knowledge of a person skilled in the art Objective under the premise of make a variety of changes.

Claims (5)

1. a kind of intensive tooth brush steam seal is formed by multistage labyrinth ring (1) is end to end, every section of labyrinth ring (1) includes labyrinth casing (11) it is arranged on the inner peripheral surface of labyrinth casing (11) with gland sealing gear (12), the gland sealing gear (12), gland sealing gear (12) packet Include high tooth sealing strip (121) and low tooth sealing strip (122), which is characterized in that the high tooth sealing strip (121) at least two, At least three low tooth sealing strips (122) are provided between the adjacent high tooth sealing strip (121), in low tooth sealing strip (122) And/or the position of high tooth sealing strip (121) is provided at least one brush ring (13), between adjacent two low tooth sealing strips (122) Distance D in an axial direction is less than or equal to 3mm, and the crown thickness of the high tooth sealing strip (121) and the low tooth sealing strip (122) is small In being provided with conduit on 0.2mm, the labyrinth casing (11), the conduit is in " Г " or " Т " shape, the shape of the brush ring (13) with The shape of conduit is adapted, and the brush ring (13) slides into the conduit, is additionally provided with and conduit phase on the labyrinth casing (11) Logical threaded hole (14), the threaded hole (14) extend in a radial direction on labyrinth casing (11), and the threaded hole (14) is used for Adjusting screw is placed, cylindrical spring is additionally provided between the adjusting screw and brush ring (13).

2. a kind of intensive tooth brush steam seal as described in claim 1, which is characterized in that the adjacent high tooth sealing strip (121) the low tooth sealing strip (122) between is uniformly arranged.

3. a kind of intensive tooth brush steam seal as claimed in claim 2, which is characterized in that the brush ring (13) includes first clamping plate (131), one end of second clamping plate (132) and brush filament (133), the brush filament (133) is installed in first clamping plate (131) and the second folder Between plate (132).

4. a kind of intensive tooth brush steam seal as claimed in claim 3, which is characterized in that the brush filament (133) is heat safe B alloy wire, the diameter of section of the brush filament (133) is 0.05~0.2mm, hardness is more than or equal to 80HB, tensile strength is more than or equal to 800Mpa。

5. a kind of intensive tooth brush steam seal as described in claim 3 or 4, which is characterized in that the brush filament (133) and labyrinth casing (11) angle between the tangent line of the corresponding position of inner peripheral surface is 20-60 degree.