CN202812460U - Steam turbine by-pass system and low-pressure by-pass adjusting valve thereof - Google Patents
Steam turbine by-pass system and low-pressure by-pass adjusting valve thereof Download PDFInfo
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- CN202812460U CN202812460U CN201220488470.3U CN201220488470U CN202812460U CN 202812460 U CN202812460 U CN 202812460U CN 201220488470 U CN201220488470 U CN 201220488470U CN 202812460 U CN202812460 U CN 202812460U
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- valve
- filter screen
- low voltage
- sliding sleeve
- valve seat
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Abstract
The utility model provides a low-pressure by-pass adjusting valve which comprises a valve body, a valve seat, valve element, a sliding sleeve and a protective filter screen, wherein the sliding sleeve is arranged outside the valve element, and the protective filter screen is arranged between the valve seat and the sliding sleeve, and is arranged outside the valve element in a covering mode. One end of the protective filter screen is connected with the end face of the valve seat along the periphery of the end face of the valve seat, and the other end of the protective filter screen is connected with the end face of the sliding sleeve along the periphery of the end face of the sliding sleeve. The low-pressure by-pass adjusting valve filters steam flowing into a channel between the valve element and the valve seat through the protective filter screen, reduces metal fragments flowing through a valve seat combination face, reduces rate of untight seal of the combination face of the valve seat and the valve element, reduces the leakage rate of the low-pressure by-pass adjusting valve, and improves the efficiency of a whole thermal power generating unit. The utility model further provides a steam turbine by-pass system with the low-pressure by-pass adjusting valve.
Description
Technical field
The utility model relates to low voltage bypass and adjusts valve manufacturing technology field, more particularly, relates to a kind of turbine bypass system and low voltage bypass thereof and adjusts valve.
Background technique
Turbine bypass system is the important supplementary equipment of fired power generating unit, and startup, overflow and three major functions of safety are arranged, and has in addition the functions such as the working medium of recovery, heating coil, cleaning, minimizing steam valve and blade erosion.Turbine bypass system mainly comprises hp by-pass system and low-pressure bypass system, and wherein, hp by-pass system is discharged to reheater to the steam from boiler superheater; Low-pressure bypass system is discharged to vapour condenser to the steam from reheater.Pipeline at low-pressure bypass system is equipped with low voltage bypass adjustment valve, and low voltage bypass adjustment valve is the visual plant in the low-pressure bypass system.
Low voltage bypass is adjusted valve and is belonged to high temperature high pressure valve, concrete structure as shown in Figure 1, double dot dash line is divided into left and right sides two-part with whole figure among Fig. 1, and left part is divided into low voltage bypass and adjusts the structural representation that valve is in closed state, and right part is divided into low voltage bypass and adjusts the structural representation that valve is in opening state.
As shown in Figure 1, low voltage bypass adjustment valve mainly comprises: valve body 13; The valve gap 15 that links to each other with valve body 13; Be positioned at the valve seat 11 of valve body 13 inside; The spool 12 that can link to each other with valve seat 11 sealings; The valve shaft 16 that links to each other with spool 12, the valve shaft 16 outer valve gaps 15 of stretching in; The execution architecture that links to each other with valve shaft 16; Be positioned at valve body 13, be located at spool 12 outsides also for the sliding sleeve 14 to spool 12 location and guiding.Be connected with high-strength bolt between valve gap 15 and the valve body 13, form frame.Have the gap between sliding sleeve 14 and the valve seat 11, can be by the passage between spool 12 and the valve seat 11 to guarantee steam.Low voltage bypass is adjusted valve and is generally pneumatic drive or motorized motions.
It is lower in off position that low voltage bypass is adjusted valve, and the junction plane between spool 12 and the valve seat 11 closely cooperates, and seals.When low voltage bypass adjustment valve need to be opened, valve shaft 16 was mentioned spool 12 under the effect of the lifting force of actuator, and all the time in sliding sleeve 14 interior operations, sliding sleeve 14 plays guiding and location to spool 12 in lifting process; When low voltage bypass adjustment valve need to cut out, valve shaft 16 promoted spool 12 and moves downwards, and combine closely with valve seat 11 under the thrust of actuator.Arrow among Fig. 1 represents the flow direction of steam.
Leakage occurs at power plant boiler and just need maintenance, need to carry out the work such as pipe cutting, welding during boiler maintenance, inevitably have metal fragment to be retained in the boiler heat pipe.When unit maintenance finishes again to start, be retained in the interior metal fragment of boiler heat pipe along with vapor flow, finally in the pipeline of low-pressure bypass system, build up.After low voltage bypass is adjusted the valve unlatching, metal fragment enters the junction plane of valve seat 11 and spool 12, because it is very little that low voltage bypass is adjusted valve opening, when low voltage bypass adjustment valve cuts out again from very little aperture, the metal fragment of building up can drop on the junction plane place, thereby cause junction plane poorly sealed, causing low voltage bypass to adjust valve leaks, and low voltage bypass is adjusted the valve leakage, a large amount of reheated steam is not done work just directly enter vapour condenser, cause heat-energy losses, cause the efficient of whole fired power generating unit lower.
In sum, how providing a kind of low voltage bypass to adjust valve, adjust the probability that leakage appears in valve to reduce low voltage bypass, and then improve the efficient of whole fired power generating unit, is present those skilled in the art's problem demanding prompt solution.
The model utility content
The purpose of this utility model provides a kind of low voltage bypass and adjusts valve, adjusts the probability that leakage appears in valve to reduce low voltage bypass, and then improves the efficient of whole fired power generating unit.
To achieve these goals, the utility model provides following technological scheme:
A kind of low voltage bypass is adjusted valve, comprising: valve body; Be positioned at valve seat, spool and the sliding sleeve of described valve inner, wherein, described sliding sleeve covers at the outside of described spool; Be arranged between described valve seat and the described sliding sleeve, and cover at the protection filter screen in the described spool outside, one end of described protection filter screen circumferentially is connected with the end face of described valve seat along described valve seat end face, and the other end of described protection filter screen circumferentially is connected with the end face of described sliding sleeve along described sliding sleeve end face.
Preferably, above-mentioned low voltage bypass is adjusted in the valve, and described protection filter screen is cylindric.
Preferably, above-mentioned low voltage bypass is adjusted in the valve, and described protection filter screen is at least two-layer.
Preferably, above-mentioned low voltage bypass is adjusted in the valve, and the mesh of described protection filter screen is rounded.
Preferably, above-mentioned low voltage bypass is adjusted in the valve, and the aperture of described protection filter screen mesh is 3-10mm.
Preferably, above-mentioned low voltage bypass is adjusted in the valve, and described protection filter screen is the stainless steel filter screen.
Preferably, above-mentioned low voltage bypass is adjusted in the valve, and described protection filter screen is weldingly connected with described valve seat and described sliding sleeve respectively.
Adjust valve based on the above-mentioned low voltage bypass that provides, the utility model also provides a kind of turbine bypass system, comprise low-pressure bypass system, be provided with low voltage bypass on the pipeline of described low-pressure bypass system and adjust valve, it is that the described low voltage bypass of above-mentioned any one is adjusted valve that described low voltage bypass is adjusted valve.
The low voltage bypass that the utility model provides is adjusted valve, by the protection filter screen is set between sliding sleeve and valve seat, one end of this protection filter screen circumferentially is connected with the end face of valve seat along the valve seat end face, the other end of protection filter screen circumferentially is connected with the end face of sliding sleeve along the sliding sleeve end face, and the protection filtering screen is located at the outside of spool.After low voltage bypass is adjusted the valve unlatching, steam flows into low voltage bypass from inlet passage and adjusts valve, steam can be first through the protection filter screen, then flow to the passage between spool and the valve seat, can be filtered by the protection filter screen with the metal fragment of vapor mixing is most of, reduce the metal fragment of the valve seat junction plane of flowing through, then reduce the poorly sealed probability of valve seat and spool junction plane, adjust the probability that leakage appears in valve thereby reduced low voltage bypass, and then improved the efficient of whole fired power generating unit.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technological scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is embodiments more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The low voltage bypass that Fig. 1 provides for prior art is adjusted the structural representation of valve;
The low voltage bypass that Fig. 2 provides for the utility model embodiment is adjusted the structural representation of valve.
Among upper Fig. 1-Fig. 2:
Embodiment
The utility model embodiment provides a kind of low voltage bypass to adjust valve, has reduced low voltage bypass and has adjusted the probability that leakage appears in valve, and then improved the efficient of whole fired power generating unit.
Below in conjunction with the accompanying drawing among the utility model embodiment, the technological scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiments.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment who obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
Please refer to accompanying drawing 2, the low voltage bypass that Fig. 2 provides for the utility model embodiment is adjusted the structural representation of valve.Double dot dash line is divided into left and right sides two-part with whole figure among Fig. 2, and left part is divided into low voltage bypass and adjusts the structural representation that valve is in closed state, and right part is divided into low voltage bypass and adjusts the structural representation that valve is in opening state.
Low voltage bypass that the utility model embodiment provides is adjusted valve, comprising: valve body 23, be positioned at valve seat 21, spool 22 and the sliding sleeve 24 of valve body 23 inside, and wherein, sliding sleeve 24 covers at the outside of spool 22; Be arranged between valve seat 21 and the sliding sleeve 24, and cover at the protection filter screen 27 in spool 22 outsides; One end of protection filter screen 27 circumferentially is connected with the end face of valve seat 21 along valve seat 21 end faces, and the other end of protection filter screen 27 circumferentially is connected with the end face of sliding sleeve 24 along sliding sleeve 24 end faces.
The low voltage bypass that the utility model embodiment provides is adjusted valve, by protection filter screen 27 is set between sliding sleeve 24 and valve seat 21, one end of this protection filter screen 27 circumferentially is connected with the end face of valve seat 21 along valve seat 21 end faces, the other end of protection filter screen 27 circumferentially is connected with the end face of sliding sleeve 24 along sliding sleeve 24 end faces, and protection filter screen 27 covers at the outside of spool 22.After low voltage bypass is adjusted the valve unlatching, steam flows into low voltage bypass from inlet passage and adjusts valve, steam can be first through protection filter screen 27, then flow to the passage between spool 22 and the valve seat 21, can be filtered by protection filter screen 27 with the metal fragment of vapor mixing is most of, reduced the metal fragment of valve seat 21 junction planes of flowing through, then reduced the poorly sealed probability of valve seat 21 and spool 22, adjust the probability that leakage appears in valve thereby reduced low voltage bypass, and then improved the efficient of whole fired power generating unit.
The low pressure bypass that above-described embodiment provides is adjusted valve, mainly comprises: valve body 23; The valve gap 25 that links to each other with valve body 23; Be positioned at valve body 23 inner and valve seat 21; The spool 22 that can be sealed and matched with valve seat 21; The valve shaft 26 that links to each other with spool 22, the valve shaft 26 outer valve gaps 25 of stretching in; The execution architecture that links to each other with valve shaft 26; Be positioned at valve body 23, be located at spool 22 outsides also for the sliding sleeve 24 to spool 22 location and guiding.Be connected with high-strength bolt between valve gap 25 and the valve body 23, form frame.Low voltage bypass is adjusted valve and is generally pneumatic drive or motorized motions.
Preferably, the low voltage bypass that above-described embodiment provides is adjusted in the valve, protection filter screen 27 is cylindric, certainly, protection filter screen 27 also can be other shapes, frustum tubular for example, and the utility model embodiment does not do concrete restriction to this, as long as protection filter screen 27 can guarantee circumferentially to be connected with the end face of sliding sleeve 24, can get final product with circumferential connection of the end face of valve seat 21 simultaneously.
In order to strengthen protecting the function of filter screen 27 filtering metal chips, the low voltage bypass that above-described embodiment provides is adjusted in the valve, and protection filter screen 27 is at least two-layer.The number of plies of protection filter screen 27 during specifically according to practical application in the pipeline content of metal fragment set, when the content of ducted metal fragment is more, multilayer proofing filter screen 27 can be set; When the content of ducted metal fragment is less, one deck protection filter screen 27 can be set.The utility model embodiment does not do concrete restriction to the number of plies of protection filter screen 27.
The low voltage bypass that above-described embodiment provides is adjusted in the valve, and the mesh of protection filter screen 27 can be rhombus, also can be square, circular.In order to strengthen the filtration to metal fragment, the preferential mesh of protection filter screen 27 of selecting is rounded.Concrete, when the mesh of protection filter screen 27 is rounded, mesh aperture is 3-1 0mm, the size of mesh during specifically according to practical application in the pipeline size of metal fragment set, the utility model embodiment does not do concrete restriction to the mesh size of protection filter screen 27.
Because it is high temperature high pressure valve that low voltage bypass is adjusted valve, the low voltage bypass that above-described embodiment provides is adjusted in the valve, and preferential selection protection filter screen 27 is the stainless steel filter screen.Concrete, protection filter screen 27 is 0Cr18Ni9Ti stainless steel filter screen, certainly, also can adopt the protection filter screen 27 of other materials, such as alloy (12Cr1MoV alloy, 15CrMo alloy etc.), as long as can guarantee some strength and hardness, require the material of protection filter screen 27 identical with the material of the miscellaneous part of low voltage bypass adjustment valve inside.
Preferably, the low voltage bypass that above-described embodiment provides is adjusted in the valve, and protection filter screen 27 is weldingly connected with valve seat 21 and sliding sleeve 24 respectively.Certainly, can adopt other mode to connect protection filter screen 27 and valve seat 21 and protection filter screen 27 and sliding sleeve 24, such as by fixed connecting piece etc., the utility model embodiment does not do concrete restriction to this yet.
The utility model embodiment also provides a kind of turbine bypass system, comprises low-pressure bypass system, is provided with low voltage bypass on the pipeline of this low-pressure bypass system and adjusts valve, and it is that the low voltage bypass described in above-described embodiment is adjusted valve that described low voltage bypass is adjusted valve.Have above-mentioned technique effect because above-mentioned low voltage bypass is adjusted valve, then the turbine bypass system that provides of the utility model embodiment also has corresponding technique effect, and this paper repeats no more.
To the above-mentioned explanation of the disclosed embodiments, make related domain professional and technical personnel can realize or use the utility model.Multiple modification to these embodiments will be apparent concerning those skilled in the art, and General Principle as defined herein can in the situation that does not break away from spirit or scope of the present utility model, realize in other embodiments.Therefore, the utility model will can not be restricted to these embodiments as herein described, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (8)
1. a low voltage bypass is adjusted valve, comprising: valve body (23), be positioned at described valve body (23) inner valve seat (21), spool (22) and sliding sleeve (24), and wherein, described sliding sleeve (24) covers at the outside of described spool (22); It is characterized in that, also comprise:
Be arranged between described valve seat (21) and the described sliding sleeve (24), and cover at the protection filter screen (27) in described spool (22) outside, one end of described protection filter screen (27) circumferentially is connected with the end face of described valve seat (21) along described valve seat (21) end face, and the other end of described protection filter screen (27) circumferentially is connected with the end face of described sliding sleeve (24) along described sliding sleeve (24) end face.
2. low voltage bypass as claimed in claim 1 is adjusted valve, it is characterized in that described protection filter screen (27) is cylindric.
3. low voltage bypass as claimed in claim 1 is adjusted valve, it is characterized in that described protection filter screen (27) is at least two-layer.
4. low voltage bypass as claimed in claim 1 is adjusted valve, it is characterized in that the mesh of described protection filter screen (27) is rounded.
5. low voltage bypass as claimed in claim 4 is adjusted valve, it is characterized in that the aperture of described protection filter screen (27) mesh is 3-10mm.
6. low voltage bypass as claimed in claim 1 is adjusted valve, it is characterized in that described protection filter screen (27) is the stainless steel filter screen.
7. adjust valve such as the described low voltage bypass of any one among the claim 1-6, it is characterized in that described protection filter screen (27) is weldingly connected with described valve seat (21) and described sliding sleeve (24) respectively.
8. a turbine bypass system comprises low-pressure bypass system, is provided with low voltage bypass on the pipeline of described low-pressure bypass system and adjusts valve, it is characterized in that, it is to adjust valve such as the described low voltage bypass of any one among the claim 1-7 that described low voltage bypass is adjusted valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220488470.3U CN202812460U (en) | 2012-09-24 | 2012-09-24 | Steam turbine by-pass system and low-pressure by-pass adjusting valve thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220488470.3U CN202812460U (en) | 2012-09-24 | 2012-09-24 | Steam turbine by-pass system and low-pressure by-pass adjusting valve thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202812460U true CN202812460U (en) | 2013-03-20 |
Family
ID=47871330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220488470.3U Expired - Lifetime CN202812460U (en) | 2012-09-24 | 2012-09-24 | Steam turbine by-pass system and low-pressure by-pass adjusting valve thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202812460U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111120023A (en) * | 2019-12-27 | 2020-05-08 | 华润电力湖北有限公司 | High-side pressure reducing valve inner leakage prevention protection structure and method |
-
2012
- 2012-09-24 CN CN201220488470.3U patent/CN202812460U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111120023A (en) * | 2019-12-27 | 2020-05-08 | 华润电力湖北有限公司 | High-side pressure reducing valve inner leakage prevention protection structure and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130320 |