CN204922047U - Seal structure of valve and be used for bypass relief pressure valve of steam turbine - Google Patents
Seal structure of valve and be used for bypass relief pressure valve of steam turbine Download PDFInfo
- Publication number
- CN204922047U CN204922047U CN201520627638.8U CN201520627638U CN204922047U CN 204922047 U CN204922047 U CN 204922047U CN 201520627638 U CN201520627638 U CN 201520627638U CN 204922047 U CN204922047 U CN 204922047U
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- mating face
- valve
- sealing configuration
- configuration according
- valve seat
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- 238000007789 sealing Methods 0.000 claims abstract description 45
- 230000013011 mating Effects 0.000 claims description 62
- 230000007704 transition Effects 0.000 claims description 8
- 230000009467 reduction Effects 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 4
- 230000003628 erosive effect Effects 0.000 description 8
- 239000012530 fluid Substances 0.000 description 2
- 230000003872 anastomosis Effects 0.000 description 1
- 235000014171 carbonated beverage Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
Abstract
The utility model relates to a sealing technique field of valve, the utility model discloses a seal structure of valve and be used for bypass relief pressure valve of steam turbine, the seal structure of valve includes disk seat (10) and case (20), the disk seat is formed with central through hole (11), this central through hole is formed with first composition surface (12) that are tapered cross section of outside expansion at the inner wall of the one end towards the case, the case includes case body (21) and forms the junction surface towards disk seat one side at the case body, the surface at this junction surface has partly second composition surface (22) that form to the sphere, second composition surface and first composition surface joint each other form confined sealing line (13). The second composition surface that is the sphere of case and disk seat be the first composition surface joint of taper surface the time the sealed face that forms for the linear sealing, have better sealed effect to the second composition surface that is the sphere can compensate owing to assemble and warp the deviation that arouses, has improved sealed stability.
Description
Technical field
The utility model relates to the sealing technique of valve, particularly, relates to a kind of sealing configuration of valve and the by-pass reducing valve for steam turbine.
Background technique
Turbine bypass system is a constituent element of modern monoblock thermodynamic system, for the amount of the steam regulation when the runnability of boiler and steam turbine does not match, such as, when the steam flow produced when boiler is greater than the steam flow required for steam turbine, excess steam is directly introduced vapour condenser after bypath system pressure and temperature reducing, and bypath system has a very important role when unit starting, load down or removal of load run.Reduction valve in bypath system is the capital equipment of bypath system, in the Environmental Conditions of steam turbine, reduction valve needs the effect of the vapor stream bearing high temperature, high pressure and have erosion, and under such conditions, the seal failure between spool and valve seat becomes the main cause of defective valve.The leakage of reduction valve will cause carbonated drink in system to run off, and reduce economic performance, and have a strong impact on the security of operation of system.
In the NB-500 type low-pressure bypass system that U.S. CCI produces, the spool of reduction valve and the sealing configuration of valve seat are that conical surface engages, the frustoconical bevel angle of spool and valve seat is all 66 °, what adopt is face sealing, in actual use, the sealing effect of this valve is bad, namely usual operation leaked after 10 months, also can repeat to occur in the rear leakage of maintenance.
Usually, linear sealing has better sealing effect, but, simple change frustoconical bevel angle, linear sealing is changed in above-mentioned sealing and also has other problems, such as: linear sealing because of potted line narrower, not erosion resistance, easily there is erosion and penetrate in the slight leakage occurred in operation, produces perfoliate gap and cause serious leak.
Therefore, be necessary to provide a kind of good sealing effect and the sealing configuration of stable valve.
Model utility content
The purpose of this utility model is to provide a kind of sealing configuration of valve, the sealing configuration good sealing effect of this valve, and erosion resistance, can steady in a long-termly run.
To achieve these goals, the utility model provides a kind of sealing configuration of valve, the sealing configuration of described valve comprises valve seat and spool, described valve seat is formed with circular central through bore, described central through bore is formed with first mating face in the tapered cross section expanded outwardly at the inwall of the one end towards described spool, described spool comprises insert body and is formed in the joining portion towards described valve seat side of described insert body, the outer surface at described joining portion has the second mating face of the part being formed as sphere, described second mating face and described first mating face can be engaged with each other and form closed potted line.
Preferably, described second mating face is formed as by the curved surface of two parallel planar interception spheres.
Preferably, described potted line is positioned at the intermediate portion of the axis along described central through bore on described first mating face.
Preferably, the cone angle in the cross section on described first mating face is 60 ° to 75 °.
Preferably, be formed with the shoulders of reduced between described insert body and described joining portion, described second mating face is formed from the peripheral edge of the end face of described shoulders.
Preferably, described joining portion is circular transition portion being formed as cross section towards the end of described valve seat, and this transition portion extends vertically from described second mating face and reduces from described second mating face.
Preferably, described first mating face and/or the second mating face are the mating face that Rockwell hardness reaches more than HRC44.
The utility model also provides a kind of by-pass reducing valve for steam turbine, and described reduction valve has the sealing configuration according to valve described above.
Pass through technique scheme, the second mating face due to spool in the utility model is a part for sphere, first mating face of valve seat is conical surface, the sealing surface that both are formed when engaging is linear sealing, there is good sealing effect, and the second mating face spherically can compensate to a certain extent because assembling and spool and valve seat be out of shapes the deviation caused, and thus further increases the stability that it seals; In addition, the sealing surface formed when being engaged in the first mating face and the second mating face is arranged on the intermediate portion on the first mating face, because medium erosion is many from the cusp at two ends, fluid passage, thus sealing structure lost efficacy to Anti-erosion and was significantly improved, and can extend the working life of valve significantly.
Other features and advantages of the utility model are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide further understanding of the present utility model, and forms a part for specification, is used from explanation the utility model, but does not form restriction of the present utility model with embodiment one below.In the accompanying drawings:
Fig. 1 is the structural representation of a kind of mode of execution of the spool of sealing configuration of the present utility model;
Fig. 2 is the structural representation of a kind of mode of execution of the valve seat of sealing configuration of the present utility model;
Fig. 3 is the close-up schematic view of the valve seat of the spool of Fig. 1 and Fig. 2 anastomosis part when engaging.
Description of reference numerals
10 valve seat 11 central through bores
12 first mating face valve seat 13 potted lines
20 spool 21 insert body
22 second mating face 23 shoulders
24 transition portions
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the utility model, is not limited to the utility model.
The sealing configuration of a kind of valve that the application provides comprises valve seat 10 and spool 20, described valve seat 10 is formed with circular central through bore 11, described central through bore 11 is formed with first mating face 12 in the tapered cross section expanded outwardly at the inwall of the one end towards described spool 20, described spool 20 comprises insert body 21 and is formed in the conjunction portion, joining portion towards described valve seat 10 side of described insert body 21, the outer surface at described joining portion has the second mating face 22 of the part being formed as sphere, described second mating face 22 and described first mating face 12 can be engaged with each other and form closed potted line 13.
When above-mentioned spool 20 inserts valve seat 10, second mating face 22 of spool is bonded with each other with the first mating face 12 of valve seat, because the second mating face 22 is a part for sphere, first mating face 12 is conical surface, the sealing surface that both are formed when engaging is linear sealing, there is good sealing effect, and, second mating face 22 part spherically, the all directions of sphere have conformity, can compensate to a certain extent because assembling and spool and valve seat are out of shape the deviation caused, thus improve the stability of sealing.
Second mating face 22 is a part for sphere and can be engaged with each other with the first mating face 12 and forms closed potted line, and the region that namely joining portion of spool 20 engages with the first mating face 12 of valve seat is sphere, and such as, this second mating face 22 can be spherical crown.Preferably, shown in Figure 1, described second mating face 22 is formed as, by the curved surface of two parallel planar interception spheres, forming potted line 13 when this curved surface engages with the first mating face 12.
As shown in Figure 3, described potted line 13 is preferably placed at the intermediate portion of the axis along described central through bore 11 on described first mating face 12.Because medium erosion is many from the cusp at two ends, fluid passage, in the application, potted line 13 is positioned at the intermediate portion of the first mating face 12 centrally axis of through hole, thus the position of potted line can be avoided preferably to receive erosion, sealing structure lost efficacy to Anti-erosion and was significantly improved, and can extend the working life of valve significantly.
The cone angle that the cross section on the first mating face 12 is formed is shown in Figure 2, and preferably, the scope of this cone angle is 60 ° to 75 °, and more preferably, the scope of this cone angle is 66 ° to 72 °.
As shown in Figure 1, preferably, be formed with the shoulders 23 of reduced between described insert body 21 and described connecting part, described second mating face 22 is formed from the peripheral edge of the end face of described shoulders 23.This shoulders 23 makes insert body 21 and valve base chamber separate, and is conducive to the assembling of insert body 21 and other parts.
Described connecting part is not needing towards the end of described valve seat 10 to engage with the first mating face 12, for reduce joining portion size and in order to avoid interfering with other parts, this end can relative to the partially reduced size at the second place, mating face 22, it is circular transition portion 24 that such as described end is formed as cross section, this transition portion 24 extends vertically from described second mating face 22 and reduces from described second mating face 22, further, the end of this transition portion 24 can be formed as plane.
For improving the erosive wear resistance of valve, described first mating face 12 and/or the second mating face 22 preferably have higher hardness, and particularly, the first mating face 12 and/or the second mating face 22 reach the mating face of more than HRC44 for Rockwell hardness.
The utility model provides a kind of by-pass reducing valve for steam turbine, and this reduction valve has spool and valve seat, and adopts the sealing configuration of above-described valve.
Below preferred implementation of the present utility model is described by reference to the accompanying drawings in detail; but; the utility model is not limited to the detail in above-mentioned mode of execution; within the scope of technical conceive of the present utility model; can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection domain of the present utility model.
It should be noted that in addition, each concrete technical characteristics described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the utility model illustrates no longer separately to various possible compound mode.
In addition, also can carry out combination in any between various different mode of execution of the present utility model, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Claims (8)
1. the sealing configuration of a valve, it is characterized in that, the sealing configuration of described valve comprises valve seat (10) and spool (20), described valve seat (10) is formed with circular central through bore (11), described central through bore (11) is formed with first mating face (12) in the tapered cross section expanded outwardly at the inwall of the one end towards described spool (20), described spool (20) comprises insert body (21) and is formed in the joining portion towards described valve seat (10) side of described insert body (21), the outer surface at described joining portion has the second mating face (22) of the part being formed as sphere, described second mating face (22) and described first mating face (12) can be engaged with each other and form closed potted line (13).
2. sealing configuration according to claim 1, is characterized in that, described second mating face (22) is formed as by the curved surface of two parallel planar interception spheres.
3. sealing configuration according to claim 2, is characterized in that, described potted line (13) is positioned at the intermediate portion of the axis along described central through bore (11) of described first mating face (12).
4. sealing configuration according to claim 2, is characterized in that, the cone angle (α) in the cross section of described first mating face (12) is 60 ° to 75 °.
5. sealing configuration according to claim 2, it is characterized in that, be formed with the shoulders (23) of reduced between described insert body (21) and described joining portion, described second mating face (22) is formed from the peripheral edge of the end face of described shoulders (23).
6. sealing configuration according to claim 2, it is characterized in that, described joining portion is circular transition portion (24) being formed as cross section towards the end of described valve seat (10), and this transition portion (24) extends vertically from described second mating face (22) and reduces from described second mating face (22).
7. sealing configuration according to claim 1, is characterized in that, described first mating face (12) and/or the second mating face (22) reach the mating face of more than HRC44 for Rockwell hardness.
8. for a by-pass reducing valve for steam turbine, it is characterized in that, described reduction valve has the sealing configuration according to the valve in claim 1-7 described in any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520627638.8U CN204922047U (en) | 2015-08-19 | 2015-08-19 | Seal structure of valve and be used for bypass relief pressure valve of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520627638.8U CN204922047U (en) | 2015-08-19 | 2015-08-19 | Seal structure of valve and be used for bypass relief pressure valve of steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204922047U true CN204922047U (en) | 2015-12-30 |
Family
ID=54971176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520627638.8U Active CN204922047U (en) | 2015-08-19 | 2015-08-19 | Seal structure of valve and be used for bypass relief pressure valve of steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204922047U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106090269A (en) * | 2016-08-30 | 2016-11-09 | 东方电气集团东方汽轮机有限公司 | A kind of ball-shaped regulating valve valve disc molded line structure and method for designing thereof |
| CN109958480A (en) * | 2017-12-22 | 2019-07-02 | 中核核电运行管理有限公司 | Improved method is leaked in domestic 650MW nuclear steam turbine homophony valve |
-
2015
- 2015-08-19 CN CN201520627638.8U patent/CN204922047U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106090269A (en) * | 2016-08-30 | 2016-11-09 | 东方电气集团东方汽轮机有限公司 | A kind of ball-shaped regulating valve valve disc molded line structure and method for designing thereof |
| CN106090269B (en) * | 2016-08-30 | 2018-05-22 | 东方电气集团东方汽轮机有限公司 | A kind of ball-shaped regulating valve valve disc molded line structure and its design method |
| CN109958480A (en) * | 2017-12-22 | 2019-07-02 | 中核核电运行管理有限公司 | Improved method is leaked in domestic 650MW nuclear steam turbine homophony valve |
| CN109958480B (en) * | 2017-12-22 | 2021-09-17 | 中核核电运行管理有限公司 | Domestic 650MW nuclear power turbine main regulating valve internal leakage improvement method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |