CN204420552U - A kind of water of condensation discharge structure pushing up steam discharge safety relief valve outlet side - Google Patents
A kind of water of condensation discharge structure pushing up steam discharge safety relief valve outlet side Download PDFInfo
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- CN204420552U CN204420552U CN201420777581.5U CN201420777581U CN204420552U CN 204420552 U CN204420552 U CN 204420552U CN 201420777581 U CN201420777581 U CN 201420777581U CN 204420552 U CN204420552 U CN 204420552U
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Abstract
The utility model discloses a kind of water of condensation discharge structure pushing up steam discharge safety relief valve outlet side, described water of condensation discharge structure is provided with hydroecium and outer water chamber in two toroidal cavities one outside the cylindrical of valve seat upper end, have middle the partition to be separated by between interior hydroecium and outer water chamber, the middle lower end cut off has through-flow gap that interior hydroecium is communicated with outer water chamber; The inner chamber aperture, lower end of exhaust steam end connecting body is greater than the aperture at aperture, upper end, valve base channel hole place, leaves the gap of annular between cylindrical place, valve seat upper end and exhaust steam end connecting body; Outer water chamber is to being outside equipped with weep hole, and the outer end of weep hole is provided with drainage joint.Its beneficial effect is: the water of condensation that can solve existing for existing product enter to cause sealing surface to be out of shape near valve sealing face and cause valve to produce leaking problem, can prevent oxidation corrosion product and impurity from entering valve closing member preferably sealing surface near and affect the sealing reliability of valve, valve is worked more reliably, ensures unit safety operation.
Description
Technical field
The utility model relates to a kind of valve mechanism, is specifically related to the partial structurtes of the safety relief valve that a kind of power station main steam system uses.
Background technique
Safety relief valve is used for opening discharged steam fast when power station main steam (overheated vapour) pressure exceedes specified value, avoid the spring safety valve events of main steam system as far as possible, thus maintain the Performance And Reliability of main steam safety valve, the use technology cycle of prolongation main steam safety valve, make the safety assurance ability that unit keeps enough.Main steam system supporting safety relief valve in thermal power plant mainly contains two large classes from product work principle and driving mode, one class drives spheroid half-twist with holes with the hard sealing pressure relief ball valve (as shown in Figure 2) of superpressure steam of releasing with drive unit, and another kind of is drive guide's flap with drive unit and drive the electromagnetic relief valve (as shown in Figure 1) of the leading type of main valve clack action.Safety relief valve is important mating valve and the critical valves of fired power generating unit, is also exist in fired power generating unit mating valve compared with serious problems always and therefore become one of valve of long-standing problem power station user.
In the many use problems existing for existing top steam discharge safety relief valve product, a wherein comparatively serious problem is: due to the reason of discharge of steam, the inner chamber of outlet pipe and outlet adpting flange can oxidation corrosion quickly, especially more serious corrosion phenomena can be there is very soon when valve has certain leakage in exhaust passage, because valve is top steam exhaust structure, the sealing surface of closure member (main valve clack or spheroid) is directed upwardly, the corrosion products such as scale and other impurity can drop or accumulate in the flowing of water of condensation near closure member (main valve clack or spheroid) sealing surface, thus affect valve seal, after exhaust from steam-expelling port to baffler between exhaust passage in can retain a large amount of steam, these steam can condensation and form water of condensation gradually, except a part of water of condensation can enter condensate drain pan that exhaust steam pipe is arranged and except being discharged by drain water piping, some water of condensation another finally can flow into and accumulate in closure member (main valve clack or spheroid) upper end, the temperature inside sealing surface is made to have larger decline, and because being in valve cavity outside sealing surface, contact with high-temperature steam and keep the condition of high temperature, the larger temperature difference that in sealing surface, outside produces because of the reason of water of condensation, the generation of sealing surface position can be made to be out of shape and to affect the sealing of valve, sealing surface even can be caused time serious to ftracture, the use of valve is caused to be affected.
Also the product of some producers is had to be provided with water of condensation discharge structure in steam (vapor) outlet side.The safety relief ball valve being illustrated in figure 3 U.S. De Laisai-Kang Suo Reed (Dresser-Consolidated) company adds the schematic diagram of weep hole and drainage joint at the lower flange place of outlet adpting flange.Although this setting can emit the water of condensation of a part, but still may have water of condensation in this section from valve closing member to aperture, valve seat upper end larger space, and be enough to bring certain impact to valve sealing face, simultaneous oxidation corrosion product and impurity bring the problem of impact also still to exist on valve sealing face; In addition, also there is a problem in such water of condensation discharge structure, namely understand some steam during valve steam discharge and blow back into drain water piping by weep hole, if have to make when entering in drain water piping compared with the high-temperature steam of various flow that the water of condensation in drain water piping gasifies again, volumetric expansion and boosting, because drain water piping is communicated with valves numerous on unit and equipment, boosting and the pressure inversion of drain water piping interior moment can bring impact to the operation of other valve and equipment.
Summary of the invention
In order to overcome the above-mentioned deficiency existing for existing structure, the utility model proposes a kind of can solve water of condensation enter to cause sealing surface to be out of shape near valve sealing face and cause valve to produce leaking problem, can prevent from oxidation corrosion product and impurity from entering near valve sealing face preferably affecting valve seal reliability, blow back into drain water piping when effectively can reduce discharge of steam, ensure that the power station main steam system of valve reliably working pushes up the water of condensation discharge structure of steam discharge safety relief valve outlet side.
To achieve these goals, the utility model is by the following technical solutions:
A kind of water of condensation discharge structure pushing up steam discharge safety relief valve outlet side, described safety relief valve, comprise and drive spheroid half-twist with holes with the hard sealing pressure relief ball valve of superpressure steam of releasing with drive unit, and drive pilot valve flap release main valve clack internal pressure to make main valve clack open the electromagnetic relief valve of discharged steam with drive unit; The discharge of steam end of safety relief valve is positioned at the top of valve, valve body upper end is provided with exhaust steam end connecting body, the lower end of exhaust steam end connecting body to be connected simultaneously with valve body upper end by flange and to compress valve seat, and the steam (vapor) outlet end band of exhaust steam end connecting body has flange for being connected with exhaust steam pipe.The major technique key of technical solutions of the utility model is: between exhaust steam end connecting body and valve seat, be provided with water of condensation discharge structure, described water of condensation discharge structure has cavity-Nei hydroecium and the outer water chamber of the annular of two concentric arrangement in the upper end cylindrical arranged outside of valve seat, the outside outer water chamber that interior hydroecium is positioned at valve seat upper end cylindrical is then positioned at the outside of hydroecium, with from exhaust steam end connecting body toward downward-extension between interior hydroecium and outer water chamber, cut off in the middle of ring and be separated by, certain gap-through-flow gap is provided with between the lower end surface place of middle partition and the plane on the downside of it, interior hydroecium is connected with outer water chamber, the aperture that exhaust steam end connecting body lumen orifice is positioned at adjacent regions place on the upside of valve seat is greater than the aperture at aperture, upper end, valve seat center-aisle hole place, and the gap leaving annular between cylindrical place, valve seat upper end and exhaust steam end connecting body lumen orifice makes the intracavity inter-connection of interior hydroecium and exhaust steam end connecting body, in the cylindrical of outer water chamber position on the upper side to being outside equipped with weep hole, the outer end of weep hole is provided with drainage joint.
The further technological scheme that the utility model is also additional following:
At valve seat, pad is set by the boss plane place that exhaust steam end connecting body compresses.
Drainage joint adopts pipe fitting, is arranged on the weep hole outlet port on the lower end flange excircle of exhaust steam end connecting body with threaded engagement.
Drainage joint adopts the steel pipe of certain length, is welded on the weep hole outlet port on the lower end flange excircle of exhaust steam end connecting body.
Electromagnetic relief valve described in the utility model, its driving mechanism comprises the driving mechanism being provided active force by electromagnet, and provides the driving mechanism of active force by electromagnetic valve Pneumatic actuator.
The beneficial effects of the utility model are: after adopting the structure described in the technical solution of the utility model, the water of condensation that can solve existing for the steam discharge safety relief valve outlet side of main steam system top, existing power station enters near valve sealing face and causes sealing surface be out of shape and cause valve to produce the problem of leaking, the problem of valve seal reliability is affected near the sealing surface that can prevent oxidation corrosion product and impurity from entering valve closing member preferably, blow back into drain water piping and impact is brought on the operation of other valve and equipment when effectively can reduce discharge of steam, valve is worked more reliably, ensure unit safety operation.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the electromagnetic relief valve of existing product-a kind of leading type.
Fig. 2 is the schematic diagram of existing product-a kind of pneumatic hard sealing pressure relief ball valve.
The schematic diagram adding the safety relief valve of water of condensation discharge joint of De Laisai-Kang Suo Reed company of the Tu3Shi U.S..
Fig. 4 is the schematic diagram of the water of condensation discharge structure of the utility model embodiment one.
Fig. 5 is the schematic diagram of the water of condensation discharge principle of the utility model embodiment one.
Fig. 6 is the schematic diagram of the utility model embodiment two.
Fig. 7 is the schematic diagram of the utility model embodiment three.
In figure, 1, exhaust steam end connecting body; 2, valve body; 3, pad; 4, valve seat; 5, interior hydroecium; 6, through-flow gap; 7, middle partition; 8, outer water chamber; 9, weep hole; 10, drainage joint; 11, spheroid; 12, main valve clack.
Embodiment
Below in conjunction with drawings and Examples, the technical solution of the utility model is further elaborated.
Embodiment one
The schematic diagram of a kind of concrete enforcement structure of water of condensation discharge structure technological scheme of the present utility model as shown in Figure 4 and Figure 5.
This water of condensation discharge structure is arranged between exhaust steam end connecting body (1) and valve seat (4), ring is processed with downwards from exhaust steam end connecting body (1) inner chamber lower end, (7) are cut off in the middle of thin-walled, there is certain spacing middle the partition between the inner radius of (7) and the cylindrical of boss upper end, valve seat (4) outside, this space constitutes interior hydroecium (5), the deep trouth of the annular that the outside cutting off (7) in centre processes then constitutes outer water chamber (8), hydroecium (5) in after assembling, middle partition (7), outer water chamber (8) successively from inside to outside, for concentric arrangement, cut off (7) by centre between interior hydroecium (5) and outer water chamber (8) to be separated by, but there is less gap-through-flow gap (6) the middle partition on the lower end surface of (7) and the boss of valve seat (4) between plane, make to be connected between interior hydroecium (5) with outer water chamber (8), top, exhaust passage hole in the middle of valve seat (4) is the conical surface of opening direction toroidal upwards, the exhaust passage hole of the bottom of exhaust steam end connecting body (1) with the above-mentioned conical surface aperture of valve seat (4) on the upside of the aperture of adjacent be greater than the aperture at this conical surface aperture place, leave the gap of annular between the exhaust passage hole of cylindrical place, valve seat (4) upper end and exhaust steam end connecting body (1) bottom, make the intracavity inter-connection of interior hydroecium (5) and exhaust steam end connecting body (1), flange excircle direction, lower end in from the cylindrical position on the upper side of outer water chamber (8) to exhaust steam end connecting body (1) is processed with weep hole (9), and the outer end of weep hole (9) is provided with drainage joint (10), drainage joint (10) can adopt pipe fitting as shown in Figure 4 and be arranged on weep hole (9) outlet port of exhaust steam end connecting body (1) with threaded engagement, and the weep hole (9) of the steel-pipe welding of the certain length of bending or not bending in exhaust steam end connecting body (1) also can be adopted to export.In order to make condensation water and steam externally leak, the boss plane place compressed by exhaust steam end connecting body (1) at valve seat (4) is also provided with pad (3) and makes water of condensation discharge structure place and valve outside completely isolated.
After valve steam discharge, can retain between the baffler of valve seat (4) upside to blow-off line and have a large amount of steam, these steam can condense gradually and form water of condensation and flow downward, on the upside of a part of water of condensation meeting flow valve.When water of condensation flows into downwards along the exhaust passage hole of exhaust steam end connecting body (1) (see Fig. 5), diameter due to the conical surface aperture of valve seat (4) upper end is less than the aperture of the bottom of contiguous exhaust steam end connecting body (1), water of condensation can flow into interior hydroecium (5) and enter in outer water chamber (8) by through-flow gap (6) simultaneously along the gap of the annular between valve seat (4) upper end and exhaust steam end connecting body (1), when the height of the water of condensation entered exceedes the height of through-flow gap (6), the path that steam enters outer water chamber (8) from interior hydroecium (5) is blocked, thus no longer have steam and can flow into drain water piping by being positioned at the weep hole (9) of outer water chamber (8) upside, and water of condensation still can smooth and easyly enter in interior hydroecium (5) and outer water chamber (8), and weep hole (9) can be passed through when the height of water of condensation reaches the lower edge height of weep hole (9) drain in the endoporus that can not be spilled over to valve seat (4) in drain water piping.Above-mentioned draining resistance vapour structure can stop steam to enter drain water piping when there being water of condensation to exist, and when discharge of steam, steam will enter drain water piping, first need flow backwards and by the narrower annular space between valve seat (4) upper end and exhaust steam end connecting body (1), at interior hydroecium (5) through dilatation and deceleration, and steam will arrive weep hole (9) place, also need to turn to and throttling through through-flow gap (6) place through 180 ° again, thus weep hole (9) place can be arrived and the amount entering the steam in drain water piping arranges weep hole than direct shown in Fig. 3 at exhaust passage place and the steam flow entered in drain water piping will greatly reduce, thus can alleviate or eliminate steam and blow back into the impact that the operation of drain water piping on other valve and equipment may bring.Therefore, water of condensation discharge structure of the present utility model, while solving entering and cause valve to produce the problem of leaking because of water of condensation near valve sealing face existing for existing safety relief valve products export side, is also more conducive to the reliable operation ensureing unit.
Water of condensation discharge structure is while solution water of condensation affects valve seal, when having oxidation corrosion product and impurity is dirty with water of condensation, equally also can flow into water of condensation and accumulate in interior hydroecium (5), and can not flow to and be trapped near closure member surface or valve sealing face, thus also eliminate the impact that oxidation corrosion product and impurity may bring valve seal.
Technological scheme described in the present embodiment, specifically implement structure and basic technical scheme for one as safety relief valve water of condensation discharge structure, be applied on the safety relief valve of two kinds of different structure type that two embodiments below address, as the fundamental sum General Construction eliminated water of condensation and oxidation corrosion product and impurity and affect valve seal; Certainly, the technological scheme of this water of condensation discharge structure that the utility model proposes be not limited in be applied in these two types involved by two embodiments safety relief valve on.
Embodiment two
The structural representation that the technical solution of the utility model is applied on pneumatic hard sealing pressure relief ball valve as shown in Figure 6.
On tape, between the bottom of the exhaust steam end connecting body (1) of lower flange end and valve seat (4), be provided with water of condensation discharge structure, by cylindrical and the step hole processed successively from inside to outside in the inner side of the lower flange of exhaust steam end connecting body (1) of valve seat (4), the thin walled structures of the ring outside step hole, the deep trouth of the annular outside thin walled structures, constitute the interior hydroecium (5) of water of condensation discharge structure respectively, middle partition (7) and outer water chamber (8), be processed with weep hole (9) from the outside lower flange cylindrical to exhaust steam end connecting body (1) of outer water chamber (8) and drainage joint (10) be installed for being connected with drain water piping at the aperture place of weep hole (9), the concrete structure at water of condensation discharge structure place is as described in embodiment one.When spheroid (11) is closed, the steam-condensation retained after Valved discharge and the water of condensation formed toward current downflow and may with water of condensation toward the oxidation corrosion product of current downflow and impurity when the upper end arriving valve seat (4) is located with exhaust steam end connecting body (1) is close, interior hydroecium (5) and outer water chamber (8) can be entered along the gap of the annular between valve seat (4) upper end and exhaust steam end connecting body (1), and the sealing surface place of spheroid (11) and valve seat (4) can not be flowed into, thus above-mentioned water of condensation discharge structure effectively can safeguard the sealing reliability of the sealing surface of spheroid (11) and valve seat (4).
Embodiment three
The structural representation that the technical solution of the utility model is applied on the steam discharge electromagnetic relief valve of top as shown in Figure 7.
On tape, between the bottom of the exhaust steam end connecting body (1) of lower flange end and valve seat (4), be provided with water of condensation discharge structure, by cylindrical and the step hole processed successively from inside to outside in the inner side of the lower flange of exhaust steam end connecting body (1) of valve seat (4), the thin walled structures of the ring outside step hole, the deep trouth of the annular outside thin walled structures, constitute the interior hydroecium (5) of water of condensation discharge structure respectively, middle partition (7) and outer water chamber (8), be processed with weep hole (9) from the outside lower flange cylindrical to exhaust steam end connecting body (1) of outer water chamber (8) and drainage joint (10) be installed for being connected with drain water piping at the aperture place of weep hole (9), the concrete structure at water of condensation discharge structure place is as described in embodiment one.When main valve clack (12) is closed, the steam-condensation retained after Valved discharge and the water of condensation formed toward current downflow and may with water of condensation toward the oxidation corrosion product of current downflow and impurity when the upper end arriving valve seat (4) is located with exhaust steam end connecting body (1) is close, interior hydroecium (5) and outer water chamber (8) can be entered along the gap of the annular between valve seat (4) upper end and exhaust steam end connecting body (1), and the sealing surface place of main valve clack (12) and valve seat (4) can not be flowed into, thus above-mentioned water of condensation discharge structure effectively can safeguard the sealing reliability of the sealing surface of main valve clack (12) and valve seat (4).
The content that this specification is not described in detail belongs to the known prior art of professional and technical personnel in the field.
Below done to illustrate to the technical solution of the utility model in conjunction with the accompanying drawings and embodiments, but these accompanying drawings and explanation can not be understood to limit scope of the present utility model.Those skilled in the art should know; the utility model is not subject to the restriction of above-described embodiment and accompanying drawing; its protection domain defined by appending claims; any in the technological scheme not exceeding the various changes in the scope that the utility model claims define, modification is formed; all do not depart from spirit of the present utility model and technical spirit, still can belong within right of the present utility model.
Claims (4)
1. one kind is pushed up the water of condensation discharge structure of steam discharge safety relief valve outlet side, described safety relief valve comprises and drives spheroid half-twist with holes with the hard sealing pressure relief ball valve of superpressure steam of releasing with drive unit and drive pilot valve action with drive unit and drive main valve clack to open the electromagnetic relief valve of discharged steam, the discharge of steam end of safety relief valve is positioned at the top of valve, valve body (2) upper end is provided with exhaust steam end connecting body (1), the lower end of exhaust steam end connecting body (1) to be connected simultaneously with valve body (2) upper end by flange and to compress valve seat (4), the steam (vapor) outlet end band of exhaust steam end connecting body (1) has flange for being connected with exhaust steam pipe, it is characterized in that: between exhaust steam end connecting body (1) and valve seat (4), be provided with water of condensation discharge structure, described water of condensation discharge structure has cavity-Nei hydroecium (5) and the outer water chamber (8) of the annular of two concentric arrangement in the upper end cylindrical arranged outside of valve seat (4), the outside outer water chamber (8) that interior hydroecium (5) is positioned at valve seat (4) upper end cylindrical is then positioned at the outside of hydroecium (5), with upper toward downward-extension from exhaust steam end connecting body (1) between interior hydroecium (5) and outer water chamber (8), cut off (7) in the middle of ring to be separated by, the middle partition between the lower end surface place of (7) and the plane on the downside of it is provided with certain gap-through-flow gap (6), interior hydroecium (5) is connected with outer water chamber (8), the aperture that exhaust steam end connecting body (1) lumen orifice is positioned at adjacent regions place, valve seat (4) upside is greater than the aperture at aperture, upper end place, valve seat (4) center-aisle hole, and the gap leaving annular between cylindrical place, valve seat (4) upper end and exhaust steam end connecting body (1) lumen orifice makes the intracavity inter-connection of interior hydroecium (5) and exhaust steam end connecting body (1), in the cylindrical position on the upper side of outer water chamber (8) to being outside equipped with weep hole (9), the outer end of weep hole (9) is provided with drainage joint (10).
2. the water of condensation discharge structure of top according to claim 1 steam discharge safety relief valve outlet side, is characterized in that: at valve seat (4), the boss plane place that exhaust steam end connecting body (1) compresses is provided with pad (3).
3. the water of condensation discharge structure of top according to claim 1 steam discharge safety relief valve outlet side, it is characterized in that: drainage joint (10) adopts pipe fitting, is arranged on weep hole (9) outlet port on the lower end flange excircle of exhaust steam end connecting body (1) with threaded engagement.
4. the water of condensation discharge structure of top according to claim 1 steam discharge safety relief valve outlet side, it is characterized in that: drainage joint (10) adopts the steel pipe of certain length, is welded on weep hole (9) outlet port on the lower end flange excircle of exhaust steam end connecting body (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420777581.5U CN204420552U (en) | 2014-12-08 | 2014-12-08 | A kind of water of condensation discharge structure pushing up steam discharge safety relief valve outlet side |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420777581.5U CN204420552U (en) | 2014-12-08 | 2014-12-08 | A kind of water of condensation discharge structure pushing up steam discharge safety relief valve outlet side |
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| CN204420552U true CN204420552U (en) | 2015-06-24 |
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| CN201420777581.5U Withdrawn - After Issue CN204420552U (en) | 2014-12-08 | 2014-12-08 | A kind of water of condensation discharge structure pushing up steam discharge safety relief valve outlet side |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104456056A (en) * | 2014-12-08 | 2015-03-25 | 章华 | Condensed water drainage structure on outlet side of steam top-discharging safety relief valve |
-
2014
- 2014-12-08 CN CN201420777581.5U patent/CN204420552U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104456056A (en) * | 2014-12-08 | 2015-03-25 | 章华 | Condensed water drainage structure on outlet side of steam top-discharging safety relief valve |
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| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150624 Effective date of abandoning: 20180123 |