CN202834500U - Multistage self-regulating gap steam seal - Google Patents
Multistage self-regulating gap steam seal Download PDFInfo
- Publication number
- CN202834500U CN202834500U CN 201220379090 CN201220379090U CN202834500U CN 202834500 U CN202834500 U CN 202834500U CN 201220379090 CN201220379090 CN 201220379090 CN 201220379090 U CN201220379090 U CN 201220379090U CN 202834500 U CN202834500 U CN 202834500U
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- packing
- reducing
- wall
- steam seal
- guide sleeve
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- Sealing Devices (AREA)
Abstract
The utility model relates to a multistage self-regulating gap steam seal. The existing steam seal has poor sealing effect and is inconvenient to disassemble and assemble. The multistage self-regulating gap steam seal comprises a base, a connecting piece, an inserting pipe and an air guide sleeve; the outer wall of the air guide sleeve is connected with the connecting piece; a plurality of annular steam seal grooves which are distributed in parallel are formed on the inner wall of the air guide sleeve; an annular reducing steam seal which can move inside the steam seal groove is arranged in each steam seal groove; the reducing steam seal is lapped on the outer wall of the inserting pipe through a steam seal gear on the inner ring wall of the reducing steam seal; the outer wall and the top surface of the reducing steam seal and the wall of the steam seal groove form an L-shaped steam seal gap; and the shape of the reducing steam seal is automatically regulated with the deformation of inner and outer cylinders, so that the leakage of high-pressure steam from a gap between the inserting pipe and the air guide sleeve is effectively prevented, and the loss of the high-pressure steam during the process of conveying is effectively reduced. The scheme realizes sealing by clamping the reducing steam seal between inserting pipe and the air guide sleeve, the structure is simple and reliable, and the multistage self-regulating gap steam seal is convenient for installation and maintenance.
Description
Technical field
The utility model relates to a kind of sealing gland, is specifically related to the whole clearance type packing of a kind of multiple, self-adjusting.
Background technique
In the generator set field, by conveying high-pressure steam in steam turbine cylinder, and drive the steam turbine set rotation, thereby reach the purpose of generating.In order to reduce cylinder body weight, outer shell formula structure in often adopting, normally in service at unit, the range of temperature of interior outer shell is different, has certain differential expansion along steam turbine axis direction between the interior outer shell; Outside high pressure steam is delivered in the steam turbine cylinder by a hard intubate of passing successively outer shell and Inner cylinder.Because the existence of interior outer shell differential expansion, the hard Connecting format such as adopt that welding or flange are connected between outer shell in intubate and the steam turbine, the shearing force that intubate will produce because bearing interior outer shell differential expansion, so damaged, leak gas.Prior art adopts piston ring type, bell-jar type and stacked three kinds of seals style that the joint of intubate and interior outer shell is sealed usually, there is following problem in the said structure scheme: 1, the piston ring type structure is designed to the elastic ring body structure of opening usually, because the operation of producing is more, be difficult to its final physical dimension of control, installation, maintenance bothers, and in the installation process, the piston ring easy-rupturing causes gas leakage; 2, the little gap of bell-jar type structure cold conditions, hot little interference, sealing effect is higher than piston ring type, but bell jar rigidity is large, and higher to the concentricity requirement of bell jar and nozzle box, production difficulty is large; 3, stacked sealing is comprised of large diaphragm seal and little diaphragm seal interval, and interior ring, outer shroud form respectively sealing surface, also form sealing surface between the lamination end face, complex structure, and have the gap between lamination and intubate, high-temperature steam easily leaks by these fit up gaps, and sealing is relatively poor.
The model utility content
In order to solve the deficiencies in the prior art, the utility model provides a kind of good airproof performance and can make intubate can better adapt to the whole clearance type packing of multiple, self-adjusting of differential expansion between interior outer shell, and further purpose provides and is convenient to altogether the whole clearance type packing of multiple, self-adjusting installing, overhaul.
The whole clearance type packing of a kind of multiple, self-adjusting, comprise base, link, be set in the intubate on the base and be nested with air guide sleeve pipe on intubate, the outer wall of air guide sleeve pipe is connected with link, described guide sleeve inner tube wall is provided with the ring-type packing groove of some parallel distributions, be equipped with the ring-type reducing packing of section's activity within it in each packing groove, described reducing packing is overlapped on by the gland sealing gear on its internal ring wall on the outer wall of described intubate, forms a L shaped labyrinth clearance between the outer wall of described reducing packing, end face and packing trough wall surface.In this programme, base and Inner cylinder are affixed, and link and outer shell are affixed; Intubate is plugged in the air guide sleeve pipe, and realize sealing by the reducing packing that is placed in the packing groove between the two, when high pressure steam passes through intubate, its part high pressure steam acts on the reducing packing by described labyrinth clearance, both so that the reducing packing outer wall effect of being stressed and force its contraction, and cause gland sealing gear and intubate outer wall on the reducing packing inwall to fit tightly, guarantee that again the reducing packing is fitted on the bottom surface of packing groove, also by the reducing packing of many group packing grooves and coupling is set, realize preferably packing effect; Because the stressed contraction of reducing packing, be full of high pressure steam between its outer wall and packing groove, guarantee that the reducing packing can adjust self form along with the deformation between interior outer shell, effectively play and prevent that high pressure steam from from the slot leakage between intubate and air guide sleeve pipe, effectively reducing the loss of high pressure steam in course of conveying; This scheme realizes sealing by holding reducing packing between intubate and air guide sleeve pipe, and is simple and reliable for structure, the convenient installation and maintenance.
Described reducing packing is ring-type, comprise some circular arc packing unit, described packing unit is provided with the reducing gap between the end, and is flexibly connected by a column spring, and the two ends of described column spring are plugged on respectively in the corresponding hole of being located at end, described packing unit.In this programme, circular arc packing unit is tandem array in twos, can form the reducing packing of an annular, is provided with the reducing gap between the packing unit, and connects by the column spring, and as preferably, the reducing packing is comprised of four packing unit; When the reducing packing was in the normality that is not subjected to external force, the column spring was in original length, and the diameter of reducing packing is larger, and the gland sealing gear on its inwall is not conflicted with the intubate outer wall; When reducing packing outer wall was subject to the thrust of high pressure steam, the packing unit is stressed to be shunk to the center and compression column spring, and the reducing gap constrictions, only allow a small amount of high pressure steam to pass through, at this moment, reducing packing diameter diminishes, and the gland sealing gear on its inwall is conflicted on the intubate outer wall, realizes sealing.
As preferably, leave air-guiding gap between the inwall of described air guide sleeve pipe and described intubate outer wall, and conflict on described base by an elastic sealing gasket in the bottom of described air guide sleeve pipe.In this programme, the high pressure steam that flows in the intubate is communicated with the packing groove by air-guiding gap and when acting on the reducing packing, a small amount of high pressure steam passes through reducing gap and air-guiding gap successively, and enters in the next stage packing groove, for next stage reducing packing provides the contraction driving force; Elastic sealing gasket is guaranteed the sealing of packing with cavity and the isolation of the space between interior outer shell that labyrinth clearance, reducing gap and air-guiding gap form.
As preferably, described packing groove bottom wall one side is provided with a limited ring, and described reducing packing is placed in the described limited ring.As preferably, the reducing packing holding that is strutted by the column spring under the normality is in described limited ring, guarantee to form certain interval between reducing packing outer wall and packing groove bottom, form the part of L shaped labyrinth clearance, guarantee that high pressure steam can enter in the space between reducing packing outer wall and packing groove bottom, and act on the outer wall of reducing packing; Lower in working order, the stressed contraction of reducing packing is also conflicted on the intubate outer wall, the sphere of activities of reducing packing between limited ring and intubate outer wall should be greater than the maximum displacement between interior outer shell, effectively prevent from causing and limited ring or the collision of intubate outer wall because the sphere of activities of reducing packing is limited, even cause the reducing packing to damage.
As preferably, described packing groove is three, and is on the inwall that vertically is evenly distributed on described air guide sleeve pipe, is respectively equipped with a conduit that is in communication with the outside on described secondary packing groove and three grades of packing grooves.In this programme, the packing groove is preferably three, has both simplified processing structure, guarantees again the sealability between intubate and air guide sleeve pipe; Be equipped with a conduit on secondary packing groove and three grades of packing grooves, high pressure steam unnecessary in the packing groove can be discharged, guarantee that packing groove internal pressures at different levels reduce step by step, prevent that packing groove internal pressure from surpassing its rated load; Secondary packing groove and three grades of interior high pressure steams of discharging of packing groove can be carried by described conduit respectively according to its pressure size, and merge or gland heater with the gas leakage of high-pressure door bar, improve the utilization ratio of high pressure steam.
As preferably, described gland sealing gear is several, and is horizontal equidistant placement on the internal ring wall of described reducing packing, leaves seal groove between adjacent gland sealing gear.Conflict by a plurality of gland sealing gears and intubate outer wall, and form a plurality of annular seal grooves that are arranged in parallel, both can hinder step by step high pressure steam by multistage mode leaks, improve sealing effect, can also disperse the conflict power between reducing packing and intubate outer wall, the contractile force that the reducing packing is subject to acts on the outer wall of intubate by the gland sealing gear Uniform Dispersion of ordered arrangement, prevents that effectively gland sealing gear from damaging because active force is excessive, reduces the packing effect.
The beneficial effects of the utility model: by holding reducing packing between air guide sleeve pipe and intubate, both can act on the deformation of many group reducing packings by high pressure steam and obtain preferably sealing effect, also so that intubate adapts to the differential expansion that produces because of temperature variation between interior outer shell preferably, and this scenario-frame is simple, be convenient to install and maintenance repair, effectively reduce the production maintenance cost.
Description of drawings
Fig. 1 is the utility model cross section structure schematic representation;
Fig. 2 is the utility model cross section structure schematic representation when in running order;
Fig. 3 is A-A ' schematic cross-section;
Fig. 4 is B-B ' schematic cross-section;
Fig. 5 is guide sleeve tube section structural representation
Among the figure: 1, base, 2, link, 3, intubate, 4, the air guide sleeve pipe, 5, the packing groove, 6, reducing packing, 7, gland sealing gear, 8, the labyrinth clearance, 9, the packing unit, 10, the reducing gap, 11, column spring, 12, air-guiding gap, 13, elastic sealing gasket, 14, limited ring, 15, conduit.
Embodiment
Below in conjunction with specification drawings and specific embodiments substantive distinguishing features of the present utility model is further described.
The whole clearance type packing of a kind of multiple, self-adjusting as shown in Figure 1, by base 1, link 2, the air guide sleeve pipe 4 that is set in the intubate 3 on the base 1 and is nested with on intubate 3 forms, the outer wall of air guide sleeve pipe 4 is connected with link 2, described air guide sleeve pipe 4 inwalls are provided with the ring-type packing groove 5 of some parallel distributions, be equipped with the ring-type reducing packing 6 of section's activity within it in each packing groove 5, described reducing packing 6 is overlapped on the outer wall of described intubate 3 by the gland sealing gear 7 on its internal ring wall, the outer wall of described reducing packing 6, form a L shaped labyrinth clearance 8 between end face and packing groove 5 walls; Described reducing packing 6 is ring-type, comprise some circular arc packing unit 9, described packing unit is provided with reducing gap 10 between 9 ends, and is flexibly connected by a column spring 11, and the two ends of described column spring 11 are plugged on respectively in the corresponding hole of being located at 9 ends, described packing unit; Leave air-guiding gap 12 between the inwall of described air guide sleeve pipe 4 and described intubate 3 outer walls, and conflict on described base 1 by an elastic sealing gasket 13 in the bottom of described air guide sleeve pipe 4; Described packing groove 5 bottom wall one side is provided with a limited ring 14, and described reducing packing 6 is placed in the described limited ring 14 (as shown in Figure 3); Described packing groove 5 is three (as shown in Figure 5), and is on the inwall that vertically is evenly distributed on described air guide sleeve pipe 4, is respectively equipped with a conduit that is in communication with the outside 15 on described secondary packing groove 5 and three grades of packing grooves 5; Described gland sealing gear 7 is the arc-shaped flaky of some horizontal equidistant placement and width dislocation coupling.
In actual use, air guide sleeve pipe 4 is nested with on intubate 3, and the one end is conflicted on base 1 wall that is connected with intubate 3 by elastic sealing gasket 13, and the other end is connected with the pipeline of conveying high-pressure steam; High pressure steam is arranged through out-of-date in pipeline, as shown in Figure 2, high pressure steam enters one-level packing groove 5 by air-guiding gap 12, and be full of labyrinth clearance 8, utilize the pressure reduction between reducing packing 6 inside and outside walls to force its compression and pass through gland sealing gear 7 conflicts on intubate 3 outer walls (as shown in Figure 4), cut off the air-flow path between gland sealing gear 7 and intubate 3 outer walls, and make reducing packing 6 keep certain radial seal power; Because there are pressure difference in one- level packing groove 5 and 5 of secondary packing grooves, high pressure steam in the labyrinth clearance 8 is squeezed into secondary packing groove 5 by reducing gap 10 and air-guiding gap 12, and act on reducing packing 6 in the secondary packing groove 5, realize 6 sealings of multi-stage reducing packing by repeating said process at air guide sleeve pipe 4 and 3 of intubate.The high-pressure steam pressure of carrying in intubate 3 hour one-level, the 6 stressed contractions of secondary reducing packing can occur, and three grades of reducing packings 6 are because of the stressed situation less than living the shape spring force of outer wall, and then three grades of in support measures of reducing packing 6 are for subsequent use.
When specific operation, owing to being subjected to the high pressure steam compressing, shrinks reducing packing 6, so that there are the certain displacement gap in 14 of reducing packing 6 outer walls and limited rings, when producing differential expansion because of temperature variation between outer shell in the steam turbine, reducing packing 6 can utilize described displacement gap mobile in limited ring 14, thereby the differential expansion of outer shell is on the impact of reducing packing 6 in reducing, in addition, during less and bottom reducing packing 6 undeformed, reducing packing 6 can utilize the reducing gap 10 of 9 of packing unit to eliminate interior outer shell differential expansion to its impact when high-pressure steam pressure.
The quantity of packing groove 5 can change according to the pressure of conveying high-pressure steam, when the pressure of high pressure steam is higher, can select packing groove 5 a fairly large number of air guide sleeve pipes 4, when the pressure of high pressure steam hangs down, then select the air guide sleeve pipe 4 of packing groove 5 negligible amounts, preferred version is three, both simple in structure, be convenient to dismounting maintenance, can also guarantee sealing.
When specific operation, in the packing groove 5 of reducing packing 6 being packed into smoothly, as preferably, reducing packing 6 is comprised of four packing unit 9, and 9 of packing unit are connected by column spring 11 in twos, and form betwixt four reducing gaps 10, for the ease of dismounting, having one gap at least in four reducing gaps 10 is oblique offering.But the quantity of reducing unit 9 is not limited to four, can adjust accordingly according to actual conditions, all is considered as specific embodiment of the utility model.
The utility model is not confined to use on the steam turbine of power field, can use in other needs are realized field that sealing carries according to its characteristics.
Claims (6)
1. whole clearance type packing of multiple, self-adjusting, comprise base (1), link (2), be set in the intubate (3) on the base (1) and be nested with air guide sleeve pipe (4) on intubate (3), the outer wall of air guide sleeve pipe (4) is connected with link (2), it is characterized in that described air guide sleeve pipe (4) inwall is provided with the ring-type packing groove (5) of some parallel distributions, be equipped with the ring-type reducing packing (6) of section's activity within it in each packing groove (5), described reducing packing (6) is overlapped on the outer wall of described intubate (3) by the gland sealing gear on its internal ring wall (7), the outer wall of described reducing packing (6), form a L shaped labyrinth clearance (8) between end face and packing groove (5) wall.
2. the whole clearance type packing of a kind of multiple, self-adjusting according to claim 1, it is characterized in that described reducing packing (6) is ring-type, comprise some circular arc packing unit (9), described packing unit (9) is provided with reducing gap (10) between the end, and by a column spring (11) flexible connection, the two ends of described column spring (11) are plugged on respectively in the corresponding hole of being located at end, described packing unit (9).
3. the whole clearance type packing of a kind of multiple, self-adjusting according to claim 1, it is characterized in that leaving air-guiding gap (12) between the inwall of described air guide sleeve pipe (4) and described intubate (3) outer wall, and conflict on described base (1) by an elastic sealing gasket (13) in the bottom of described air guide sleeve pipe (4).
4. the whole clearance type packing of a kind of multiple, self-adjusting according to claim 1 is characterized in that described packing groove (5) bottom wall one side is provided with a limited ring (14), and described reducing packing (6) is placed in the described limited ring (14).
5. the whole clearance type packing of a kind of multiple, self-adjusting according to claim 4, it is characterized in that described packing groove (5) is three, and be on the inwall that vertically is evenly distributed on described air guide sleeve pipe (4), be respectively equipped with a conduit that is in communication with the outside (15) on described secondary packing groove (5) and the three grades of packing grooves (5).
6. the whole clearance type packing of a kind of multiple, self-adjusting according to claim 1 is characterized in that described gland sealing gear (7) is several, and is horizontal equidistant placement on the internal ring wall of described reducing packing (6), and adjacent gland sealing gear leaves seal groove between (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220379090 CN202834500U (en) | 2012-07-30 | 2012-07-30 | Multistage self-regulating gap steam seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220379090 CN202834500U (en) | 2012-07-30 | 2012-07-30 | Multistage self-regulating gap steam seal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202834500U true CN202834500U (en) | 2013-03-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220379090 Expired - Lifetime CN202834500U (en) | 2012-07-30 | 2012-07-30 | Multistage self-regulating gap steam seal |
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| Country | Link |
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| CN (1) | CN202834500U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112780360A (en) * | 2021-03-09 | 2021-05-11 | 浙江浙能技术研究院有限公司 | Improved Braiden vapor seal suitable for low-load working condition |
-
2012
- 2012-07-30 CN CN 201220379090 patent/CN202834500U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112780360A (en) * | 2021-03-09 | 2021-05-11 | 浙江浙能技术研究院有限公司 | Improved Braiden vapor seal suitable for low-load working condition |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 310003 Hangzhou City, Fung Fung Road, No. Guoxin real estate building, building 15, building 108 Patentee after: ZHEJIANG ENERGY R & D INSTITUTE Co.,Ltd. Address before: Hangzhou City, Zhejiang province 310052 Binjiang District Binsheng Road No. 1751 building second floor zheneng Patentee before: Zhejiang Zheneng Energy Technology Co.,Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20130327 |
|
| CX01 | Expiry of patent term |