CN201502409U - Main steam valve of steam turbine - Google Patents
Main steam valve of steam turbine Download PDFInfo
- Publication number
- CN201502409U CN201502409U CN2009201287234U CN200920128723U CN201502409U CN 201502409 U CN201502409 U CN 201502409U CN 2009201287234 U CN2009201287234 U CN 2009201287234U CN 200920128723 U CN200920128723 U CN 200920128723U CN 201502409 U CN201502409 U CN 201502409U
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- CN
- China
- Prior art keywords
- valve
- main
- steam turbine
- steam
- auxiliary spool
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- Lift Valve (AREA)
Abstract
The utility model relates to a main steam valve of a steam turbine, which comprises a valve stem (1), a main valve core (3) with a through hole (2), and a main valve seat (13). The main steam valve is also additionally provided with an auxiliary valve core (4) and a ring-shaped pressing cover (6) with a flowing hole (5). The main steam valve with the structure reduces the effect of the steam pressure on the main steam valve when the steam turbine starts, reduces the requirement of the initial starting force of the main steam valve of the steam turbine on a servomotor and can improve the startup performance of the steam turbine, namely the steam turbine can be stably started by small driving force of the servomotor during the starting process, thus improving the stability of the rotating speed when the steam turbine starts initially.
Description
Technical field
The utility model relates to a kind of steam turbine, is specifically related to a kind of steam turbine main inlet throttle-stop valve.
Background technique
In industries such as chemical industry, generating, using the steam turbine of various steam turbine, particularly Turbo-generator Set in a large number.Steam turbine in the market mostly is carries plate group valve formula main inlet throttle-stop valve, it mainly comprises the upper cavity, lower chamber, the valve base that have the steam inlet, be arranged on the valve base and valve hole that upper cavity and lower chamber are communicated with, be arranged on the valve hole place and adopt the mode that closely contacts that the spool of its sealing is carried plate with the valve rod that closely contacts with spool, the valve of fixedlying connected with valve rod, carry follower link and the promotion connecting rod that plate is connected successively with valve, this promotion connecting rod can slide up and down under the effect of oil engine driving force.Because steam turbine is when initial start, the first valve spool upstream and downstream pressure reduction is big, be the total pressure of steam, though initial start only relates to first valve, but still the first valve valve could be opened and control to the enough big driving force of oil engine output that needs to drive group's valve group smoothly reposefully.Theoretically, the oil engine driving force is big more, just steady more during first valve opening, power steam pressure is just more little to the influence of first valve opening, but in the commercial Application of reality, the driving force that increases oil engine is subjected to the restriction of each side, thereby often starts rotating speed and be difficult to control, and the fluctuation of speed is big.
The model utility content
At above-mentioned contradiction, the utility model provides a kind of steam turbine main inlet throttle-stop valve, and not only the fluctuation of speed is little when starting for this main inlet throttle-stop valve, is easy to control, can also reduce the requirement to adapted oil engine driving force.
The purpose of this utility model is achieved through the following technical solutions: a kind of steam turbine main inlet throttle-stop valve, comprise valve rod, have the main valve plug and the main valve seat of through hole, the lower end surface of described main valve plug and main valve seat form sealing, and this main inlet throttle-stop valve also has additional auxiliary spool and is provided with the annular gland of opening; The upper end of described auxiliary spool and described valve rod are connected to one, and the lower end surface closely contacts with described through hole and with its sealing; Described gland is inserted in described valve rod and is fastened on the described main valve plug.
Described auxiliary spool diameter projected in the axial direction is greater than the diameter projected that encircles in the described annular gland, under of the traction of described auxiliary spool at described valve rod away from described through hole, promptly open auxiliary spool, steam enters steam turbine and sets up pressure by described opening, along with opening gradually of auxiliary spool, described auxiliary spool upper end contacts with described gland, thereby drive the main valve plug motion that is fastenedly connected with described gland, thereby open main valve plug, finish whole opening procedures of carrying plate valve first valve; The lower end surface of described auxiliary spool is a curved surface, and its size adapts with the diameter of described through hole, thereby can well seal described through hole.
In order to make main inlet throttle-stop valve more steady in the process of opening, the center line of described main valve plug, described auxiliary spool, described gland and described valve rod in the vertical direction is on same axis.
In order to prevent that described auxiliary spool breaks away from described valve rod in away from the movement process of described through hole, described auxiliary spool and described valve rod are fixing for being rigidly connected; Certainly, described auxiliary spool and described valve rod also can be designed to one, promptly can whole process; But described valve rod and described gland in the vertical direction slide relative.
The utility model is set up auxiliary spool and is had the gland of opening on the main inlet throttle-stop valve of steam turbine, when valve rod lifting auxiliary spool moves upward, because the through hole of main valve plug is less, this moment, steam turbine upper cavity medium power vapor pressure was far smaller than the lifting force of valve rod to the pressure of auxiliary spool, so vapor pressure is also very little to the influence that auxiliary spool is opened, auxiliary spool can leave the sealing surface of through hole stably, and power steam enters into the valve hole of main inlet throttle-stop valve successively by opening and through hole; Along with the continuation campaign of auxiliary spool, steam flow increases gradually, thereby the pressure of steam turbine lower chamber raises gradually, so the pressure difference of main valve plug upper and lower sides also reduces gradually; When auxiliary spool finally moves to the gland lower end surface, main valve plug will move upward together with auxiliary spool, make main valve plug break away from valve hole, this moment, the pressure difference owing to the main valve plug upper and lower sides reduced, so main inlet throttle-stop valve can be opened smoothly reposefully, thereby reduced the influence that power steam pressure is opened main inlet throttle-stop valve, be easy to control; The main inlet throttle-stop valve of this structure is less demanding to the driving force of oil engine, thereby has reduced the requirement to the oil engine driving force.
Description of drawings
Fig. 1 is the structural representation of steam turbine main inlet throttle-stop valve among the utility model embodiment 1.
Fig. 2 is the non-restrictive structure schematic representation of main inlet throttle-stop valve first valve among Fig. 1.
Embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments, but therefore the utility model is not limited among the following concrete mode.
Embodiment 1: as depicted in figs. 1 and 2, a kind of steam turbine main inlet throttle-stop valve comprises valve rod 1, has the main valve plug 3 and the main valve seat 13 of through hole 2, and this main inlet throttle-stop valve also has additional auxiliary spool 4 and is provided with the annular gland 6 of opening 5; The upper end 4-1 and the described valve rod 1 of described auxiliary spool 4 are connected to one, and lower end surface 4-2 closely contacts with described through hole 2 and with its sealing; Described gland 6 is inserted in described valve rod 1 and is fastened on the described main valve plug 3; Described auxiliary spool 4 diameter projected in the axial direction is greater than the diameter projected of ring in the described annular gland 6; The lower end surface 4-2 of described auxiliary spool 4 is a curved surface, and its size adapts with the diameter of described through hole 2; The center line of described main valve plug 3, described auxiliary spool 4, described gland 6 and described valve rod 1 in the vertical direction is on same axis; The upper end 4-1 of described auxiliary spool 4 and 1 welding of described valve rod are fixing; But described valve rod 1 and described gland 6 in the vertical direction slide relative.
When power steam from the steam inlet 7 when entering upper cavity 8, promotion connecting rod 9 draws follower link 10 and moves upward under the driving of oil engine, the main inlet throttle-stop valve group is carried plate 11 and described valve rod 1 moves upward thereby drive successively, thereby described valve rod 1 promotes described auxiliary spool 4 and moves upward, and opens described auxiliary spool 4; Along with in the continuation of described auxiliary spool 4 to motion, steam flow increases gradually, thus the pressure of steam turbine lower chamber 12 raises gradually, therefore the pressure difference of described main valve plug 3 upper and lower sides also reduces gradually; When described auxiliary spool 4 finally moves to described gland 6 lower end surfaces, described main valve plug 3 will move upward together with described auxiliary spool 4, make described main valve plug 3 break away from described valve hole 9, this moment, the pressure difference owing to described main valve plug 3 upper and lower sides reduced, so main inlet throttle-stop valve can be opened smoothly reposefully.
The main inlet throttle-stop valve of this structure is applied to first valve in the vapor wheel group of planes valve usually, can certainly be applied to second valve or other valves, and its working principle is identical with the working principle of first valve.
Claims (5)
1. steam turbine main inlet throttle-stop valve comprises valve rod (1), has the main valve plug (3) and the main valve seat (13) of through hole (2), and it is characterized in that: this main inlet throttle-stop valve also has additional auxiliary spool (4) and is provided with the annular gland (6) of opening (5); Fixedly connected with described valve rod (1) in the upper end (4-1) of described auxiliary spool (4), lower end surface (4-2) closely contacts with described through hole (2) and with its sealing; Described gland (6) is inserted in described valve rod (1) and is fastened on the described main valve plug (3).
2. steam turbine main inlet throttle-stop valve as claimed in claim 1 is characterized in that: described auxiliary spool (4) diameter projected in the axial direction is greater than the diameter projected of ring in the described annular gland (6); The lower end surface (4-2) of described auxiliary spool (4) is a curved surface, and its size adapts with the diameter of described through hole (2).
3. steam turbine main inlet throttle-stop valve as claimed in claim 2 is characterized in that: the center line of described main valve plug (3), described auxiliary spool (4), described gland (6) and described valve rod (1) in the vertical direction is on same axis.
4. steam turbine main inlet throttle-stop valve as claimed in claim 3 is characterized in that: the upper end (4-1) of described auxiliary spool (4) is rigidly connected with described valve rod (1) or integral body is processed into one.
5. as each described steam turbine main inlet throttle-stop valve in the claim 1～4, it is characterized in that: described valve rod (1) and described gland (6) but the in the vertical direction slide relative.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201287234U CN201502409U (en) | 2009-09-03 | 2009-09-03 | Main steam valve of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201287234U CN201502409U (en) | 2009-09-03 | 2009-09-03 | Main steam valve of steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201502409U true CN201502409U (en) | 2010-06-09 |
Family
ID=42453345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201287234U Expired - Lifetime CN201502409U (en) | 2009-09-03 | 2009-09-03 | Main steam valve of steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201502409U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113187951A (en) * | 2021-04-26 | 2021-07-30 | 中国船舶重工集团公司第七0三研究所 | Throttle and noise reduction filter screen regulating valve |
| CN114658498A (en) * | 2020-12-23 | 2022-06-24 | 上海电气电站设备有限公司 | Steam turbine combined valve and design method thereof |
-
2009
- 2009-09-03 CN CN2009201287234U patent/CN201502409U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114658498A (en) * | 2020-12-23 | 2022-06-24 | 上海电气电站设备有限公司 | Steam turbine combined valve and design method thereof |
| CN114658498B (en) * | 2020-12-23 | 2024-03-19 | 上海电气电站设备有限公司 | Combined valve of steam turbine and design method thereof |
| CN113187951A (en) * | 2021-04-26 | 2021-07-30 | 中国船舶重工集团公司第七0三研究所 | Throttle and noise reduction filter screen regulating valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 401254 Changshou District of Chongqing Weijianglu No. 36 Patentee after: Sinopec group Chuanwei Chongqing Chemical Industry Co. Ltd. Address before: 401254 Changshou District of Chongqing Weijianglu No. 36 Patentee before: Sichuan Vinylon Plant. SINOPEC |
|
| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100609 |
|
| CX01 | Expiry of patent term |