CN104456056B - A kind of condensate discharge structure of top row vapour safety relief valve outlet side - Google Patents
A kind of condensate discharge structure of top row vapour safety relief valve outlet side Download PDFInfo
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- CN104456056B CN104456056B CN201410755911.5A CN201410755911A CN104456056B CN 104456056 B CN104456056 B CN 104456056B CN 201410755911 A CN201410755911 A CN 201410755911A CN 104456056 B CN104456056 B CN 104456056B
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Abstract
The invention discloses a kind of condensate discharge structure of top row vapour safety relief valve outlet side, described condensate discharge structure is provided with hydroecium and outer water chamber in two toroidal cavities in the cylindrical outside in valve seat upper end, there is middle cut-off to be separated by between interior hydroecium and outer water chamber, the lower end of centre cut-off has through-flow gap interior hydroecium is communicated with outer water chamber；The lower end inner chamber aperture of exhaust steam end connector is more than the aperture at the upper end aperture of valve base channel hole, and the gap of annular is left between the cylindrical place in valve seat upper end and exhaust steam end connector；Outer water chamber is outwards provided with osculum, and the outer end of osculum is provided with drainage joint.Its advantage is：It can solve the problem that the condensate present in existing product enters near valve sealing face the problem of causing to seal facial disfigurement and cause valve to produce leakage, can preferably prevent oxidation corrosion product and impurity from entering near the sealing surface of valve closing member and influenceing the sealing reliability of valve, valve is more reliably worked, ensure unit safety operation.
Description
Technical field
The present invention relates to a kind of valve mechanism, and in particular to safety relief valve used in a kind of power station main steam system
Partial structurtes.
Background technology
Safety relief valve is used for quick open when power station main steam (crossing hot vapour) pressure exceedes setting and discharges steam, to the greatest extent
The spring safety valve events of main steam system can be avoided that, so as to maintain the Performance And Reliability of main steam safety valve, extend master
The use of steam security valve and maintenance cycle, unit is set to keep enough safety assurance abilities.Thermal power plant main steam system
Supporting safety relief valve mainly have two major classes from the point of view of product operation principle and type of drive, one kind is driven with drive device
Dynamic spheroid with holes is rotated by 90 ° the hard sealing pressure relief ball valve (as shown in Figure 2) with superpressure steam of releasing, and another kind of is with drive device
The electromagnetic relief valve (as shown in Figure 1) for the pilot-operated type for driving guide's flap and driving main valve clack to act.Safety relief valve is thermoelectricity
The important mating valve and critical valves of unit, and exist always in fired power generating unit mating valve more serious problem and therefore and
One of valve as long-standing problem power station user.
In many use problems present in existing top row vapour safety relief valve product, wherein more serious one
Individual problem is：Due to discharge of steam, the inner chamber of blast pipe and outlet adpting flange can oxidation corrosion quickly, especially
More serious corrosion phenomena can occur in exhaust passage quickly when valve has certain leakage because valve for top steam exhaust structure,
Upward, the corrosion product such as oxide skin and other impurity can drop or with solidifying in the sealing surface direction of closure member (main valve clack or spheroid)
The flowing that bears water and accumulate near closure member (main valve clack or spheroid) sealing surface, so as to influence valve seal；From row after exhaust
Substantial amounts of steam can be retained in steam ports to the exhaust passage between muffler, these steam can gradually condense and form condensate,
In addition to being discharged except a part of condensate can enter on gland steam exhauster the condensate drain pan set by drain water piping, some another condensate
Eventually flow into and accumulate at closure member (main valve clack or spheroid) upper end, the temperature on the inside of sealing surface is had larger decline, and
On the outside of sealing surface because in valve cavity, contact with high-temperature steam keep the condition of high temperature, because of condensate on the outside of sealing surface is interior
Reason and the caused larger temperature difference, can make sealing surface position be deformed and influence the sealing of valve, can even draw when serious
Sealing surface cracking is played, causes the use of valve to be affected.
Also the product for having some producers is provided with condensate discharge structure in steam (vapor) outlet side.It is illustrated in figure 3 U.S.'s moral
The safety relief ball valve of Lai Sai-Kang Suo Reeds (Dresser-Consolidated) company is at the lower flange of outlet adpting flange
Add the schematic diagram of osculum and drainage joint.Although this setting can discharge the condensate of a part, from valve
Closure member is enough to valve sealing face to still might have condensate in this section of larger space in valve seat upper end aperture
Certain influence is brought, the problem of simultaneous oxidation corrosion product and impurity bring influence to valve sealing face remains on presence；This
Outside, such condensate discharge structure there is also an issue, i.e., valve steam discharge when understand some steam by osculum and
Drain water piping is blowed back into, if the high-temperature steam compared with various flow enters the condensation that can make when in drain water piping in drain water piping
Water gasifies again, volumetric expansion and boost, because drain water piping connects valve numerous on unit and equipment, in drain water piping
The boosting of moment and pressure inversion can bring influence to the operation of other valves and equipment.
The content of the invention
In order to overcome the above-mentioned weak point present in existing structure, the present invention proposes one kind and can solve the problem that condensate
The problem of nearby causing to seal facial disfigurement and cause valve to produce leakage into valve sealing face, being capable of preferably anti-oxidation rust
Erosion product and impurity flow backwards when entering valve sealing face nearby and influenceing valve seal reliability, can effectively reduce discharge of steam
Enter drain water piping, ensure valve reliably working power station main steam system top row vapour safety relief valve outlet side condensate row
Put structure.
To achieve these goals, the present invention uses following technical scheme：
A kind of condensate discharge structure of top row vapour safety relief valve outlet side, described safety relief valve, including to drive
Dynamic device drives spheroid with holes to be rotated by 90 ° the hard sealing pressure relief ball valve with superpressure steam of releasing, and drives guide with drive device
Pressure makes main valve clack open the electromagnetic relief valve for discharging steam in valve flap release main valve clack；The discharge of steam end of safety relief valve
Positioned at the top of valve, exhaust steam end connector is provided with valve body upper end, the lower end of exhaust steam end connector passes through flange and valve body
Upper end connects simultaneously and compresses valve seat, and the steam (vapor) outlet end of exhaust steam end connector is used to connect with gland steam exhauster with flange.This hair
The major technique key of bright technical scheme is：Condensate discharge structure is provided between exhaust steam end connector and valve seat, it is described
Condensate discharge structure annular cavity-interior hydroecium of two concentric arrangements and outer is provided with the cylindrical outside in the upper end of valve seat
Hydroecium, interior hydroecium is located at the cylindrical outside in valve seat upper end and outer water chamber is then located at the outside of interior hydroecium, interior hydroecium and outer water chamber it
Between be separated by with cut-off among down extending from exhaust steam end connector, annular, with being located at the lower surface of centre cut-off
Certain gap-through-flow gap is provided between plane on the downside of it, interior hydroecium is connected with outer water chamber；In exhaust steam end connector
Lumen pore is located at the aperture that the aperture on the upside of valve seat at adjacent regions is more than at the upper end aperture of valve seat center-aisle hole, outside valve seat upper end
Leaving the gap of annular at circle between exhaust steam end connector lumen orifice makes the intracavity inter-connection of interior hydroecium and exhaust steam end connector；
Osculum is outwards provided with the cylindrical opening position on the upper side of outer water chamber, the outer end of osculum is provided with drainage joint.
The further technical scheme that the present invention is also appended below：
Pad is set at the boss plane that valve seat is compressed by exhaust steam end connector.
Drainage joint uses pipe fitting, the osculum being arranged on threaded engagement on the lower end flange excircle of exhaust steam end connector
Exit.
Drainage joint uses the steel pipe of certain length, the osculum being welded on the lower end flange excircle of exhaust steam end connector
Exit.
Electromagnetic relief valve of the present invention, its drive mechanism include the drive mechanism that active force is provided by electromagnet, and
The drive mechanism of active force is provided by solenoid valve control pneumatic means.
The beneficial effects of the invention are as follows：After the structure described in technical scheme, existing electricity can solve the problem that
Condensate present in station owner's vapour system top row vapour safety relief valve outlet side, which enters valve sealing face, nearby to be caused to seal
Facial disfigurement and cause valve produce leakage the problem of, can preferably prevent oxidation corrosion product and impurity from entering valve closing member
Sealing surface nearby and the problem of influence valve seal reliability, blow back into drain water piping when can effectively reduce discharge of steam and
Operation on other valves and equipment brings influence, valve is more reliably worked, and ensures unit safety operation.
Brief description of the drawings
Fig. 1 is a kind of schematic diagram of the electromagnetic relief valve of existing product-pilot-operated type.
Fig. 2 is a kind of schematic diagram of existing product-pneumatic hard sealing pressure relief ball valve.
Fig. 3 is the signal of the safety relief valve for adding condensate discharge joint of De Laisai-Kang Suo Reeds company of the U.S.
Figure.
Fig. 4 is the schematic diagram of the condensate discharge structure of the embodiment of the present invention one.
Fig. 5 is the schematic diagram of the condensate discharge principle of the embodiment of the present invention one.
Fig. 6 is the schematic diagram of the embodiment of the present invention two.
Fig. 7 is the schematic diagram of the embodiment of the present invention three.
In figure, 1, exhaust steam end connector；2nd, valve body；3rd, pad；4th, valve seat；5th, interior hydroecium；6th, through-flow gap；7th, middle interval
It is disconnected；8th, outer water chamber；9th, osculum；10th, drainage joint；11st, spheroid；12nd, main valve clack.
Embodiment
Technical scheme is further elaborated with reference to the accompanying drawings and examples.
Embodiment one
It is a kind of showing for specific implementation structure of the condensate discharge structure technical scheme of the present invention as shown in Figure 4 and Figure 5
It is intended to.
The condensate discharge structure is arranged between exhaust steam end connector (1) and valve seat (4), from exhaust steam end connector (1)
Inner chamber lower end is machined with downwards cut-off (7) among annular, thin-walled, and centre separates on the outside of inner radius and the valve seat (4) of (7)
Boss upper end it is cylindrical between have certain spacing, the space constitutes interior hydroecium (5), and in the outside institute of middle cut-off (7)
The annular deep trouth processed then constitutes outer water chamber (8), and interior hydroecium (5), centre separate (7), outer water chamber (8) successively after assembling
From inside to outside, it is concentric arrangement, is separated by between interior hydroecium (5) and outer water chamber (8) by centre cut-off (7), but middle cut-off (7)
There is less gap-through-flow gap (6) on the boss of lower surface and valve seat (4) between plane, make interior hydroecium (5) and outer water chamber
(8) it is connected between；Exhaust passage hole top among valve seat (4) is the conical surface of the upward toroidal of opening direction, steam discharge
Hold the aperture of exhaust passage hole adjacent on the upside of the above-mentioned conical surface aperture with valve seat (4) of the bottom of connector (1) to be more than to be somebody's turn to do
Aperture at conical surface aperture, ring is left between the cylindrical place in valve seat (4) upper end and the exhaust passage hole of exhaust steam end connector (1) bottom
The gap of shape, make the intracavity inter-connection of interior hydroecium (5) and exhaust steam end connector (1)；In the cylindrical opening position on the upper side of outer water chamber (8)
Osculum (9) is machined with to the lower end flange excircle direction of exhaust steam end connector (1), and is provided with the outer end of osculum (9)
Drainage joint (10), drainage joint (10) can use pipe fitting as shown in Figure 4 and be arranged on exhaust steam end connector with threaded engagement
(1) osculum (9) exit, the steel-pipe welding of certain length of bending or not bending can also be used in exhaust steam end connector
(1) osculum (9) outlet.In order that condensate and steam will not be to External leakages, in valve seat (4) by exhaust steam end connector
(1) compress boss plane at and be provided with pad (3) make at condensate discharge structure with valve outside completely isolation.
After valve steam discharge, can be retained between muffler of valve seat (4) upside to blow-off line has substantial amounts of steam, these
Steam can gradually be condensed and form condensate and flow downward, and a part of condensate can be flowed on the upside of valve.When condensate along
(see Fig. 5) when the exhaust passage hole of exhaust steam end connector (1) flows downwardly into, due to the diameter in the conical surface aperture of valve seat (4) upper end
Less than the aperture of the bottom of neighbouring exhaust steam end connector (1), condensate can be along valve seat (4) upper end and exhaust steam end connector (1)
Between annular gap and flow into interior hydroecium (5) and entered simultaneously in outer water chamber (8) by through-flow gap (6), when entering
When the height of the condensate entered exceedes the height of through-flow gap (6), steam enters the path quilt of outer water chamber (8) from interior hydroecium (5)
Block, thus no longer have steam to flow into drain water piping by the osculum (9) on the upside of outer water chamber (8), and
Condensate smooth can still enter in interior hydroecium (5) and outer water chamber (8), and reach the following of osculum (9) in the height of condensate
It is interior without being spilled in the endoporus of valve seat (4) along drain water piping can be drained into during height by osculum (9).Above-mentioned draining
Resistance vapour structure can prevent steam from entering drain water piping in the presence of having condensate, and in discharge of steam, steam, which will enter, to be dredged
Waterpipe, it is necessary first to flow backwards and by the narrower annular gap between valve seat (4) upper end and exhaust steam end connector (1),
Interior hydroecium (5) passes through dilatation and deceleration, and steam will reach osculum (9) place, it is also necessary to is turned to and by logical by 180 ° again
The throttling at ebb interval (6) place, thus the amount of osculum (9) place and the steam entered in drain water piping can be reached than shown in Fig. 3
It is direct osculum is set at exhaust passage and the quantity of steam that enters in drain water piping will greatly reduce, so as to mitigate
Or eliminate steam and blow back into the influence that operation of the drain water piping to other valves and equipment may be brought.Therefore, it is of the invention solidifying
Bear water discharge structure solve present in existing safety relief valve products export side because of condensate, to enter valve sealing face attached
While the problem of closely causing valve to produce leakage, it is more favorable to ensure the reliability service of unit.
Condensate discharge structure solve condensate influence valve seal while, when have oxidation corrosion product and impurity with
When condensate flows down, it equally can also flow into and be accumulated in interior hydroecium (5) with condensate, without flowing to and being trapped in closing
Near part surface or valve sealing face, thus also eliminate the shadow that oxidation corrosion product and impurity may be brought to valve seal
Ring.
Technical scheme described in the present embodiment, one as safety relief valve condensate discharge structure is embodied structure
And basic technical scheme, it is applied to the safety relief valves of two kinds of different structure types that two embodiments below are addressed
On, as the basic and universal architecture for eliminating condensate and oxidation corrosion product and impurity and being influenceed on valve seal；Certainly, this hair
The technical scheme of bright the proposed condensate discharge structure is not limited in applying two kinds involved by the two embodiments
On the safety relief valve of type.
Embodiment two
It is the structural representation that technical scheme 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 connector (1) at lower flange end and valve seat (4), it is provided with condensate discharge
Structure, the step processed successively from inside to outside by the inner side of the cylindrical of valve seat (4) and the lower flange in exhaust steam end connector (1)
Annular deep trouth on the outside of the thin-wall construction of annular on the outside of hole, stepped hole, thin-wall construction, has respectively constituted condensate discharge
The interior hydroecium (5) of structure, middle cut-off (7) and outer water chamber (8), the laxative remedy from outer water chamber (8) out to exhaust steam end connector (1)
Blue cylindrical place is machined with osculum (9) and is mounted with that drainage joint (10) is used for and drain water piping at the aperture of osculum (9)
Connect, the concrete structure at condensate discharge structure is as described in embodiment one.When spheroid (11) is closed, stayed after Valved discharge
The steam condensation deposited and the condensate flow down that is formed and may be with the oxidation corrosion product of condensate flow down and miscellaneous
Matter, can be along valve seat (4) upper end and exhaust steam end connector when reaching the upper end of valve seat (4) and exhaust steam end connector (1) close to place
(1) the annular gap between enters interior hydroecium (5) and outer water chamber (8), without flowing into the close of spheroid (11) and valve seat (4)
At front cover, thus above-mentioned condensate discharge structure can effectively safeguard that the sealing of the sealing surface of spheroid (11) and valve seat (4) can
By property.
Embodiment three
It is the structural representation that technical scheme is applied on top row vapour electromagnetic relief valve as shown in Figure 7.
On tape, between the bottom of the exhaust steam end connector (1) at lower flange end and valve seat (4), there is provided condensate discharge
Structure, the step processed successively from inside to outside by the inner side of the cylindrical of valve seat (4) and the lower flange in exhaust steam end connector (1)
Annular deep trouth on the outside of the thin-wall construction of annular on the outside of hole, stepped hole, thin-wall construction, has respectively constituted condensate discharge
The interior hydroecium (5) of structure, middle cut-off (7) and outer water chamber (8), the laxative remedy from outer water chamber (8) out to exhaust steam end connector (1)
Blue cylindrical place is machined with osculum (9) and is mounted with that drainage joint (10) is used for and drain water piping at the aperture of osculum (9)
Connect, the concrete structure at condensate discharge structure is as described in embodiment one.When main valve clack (12) is closed, institute after Valved discharge
Retention steam condensation and formed condensate flow down and may with condensate flow down oxidation corrosion product and
Impurity can be connected when reaching the upper end of valve seat (4) and exhaust steam end connector (1) close to place along valve seat (4) upper end with exhaust steam end
Annular gap between body (1) enters interior hydroecium (5) and outer water chamber (8), without flowing into main valve clack (12) and valve seat (4)
Sealing surface at, thus above-mentioned condensate discharge structure can effectively safeguard the sealing surface of main valve clack (12) and valve seat (4)
Sealing reliability.
The content that this specification is not described in detail belongs to prior art known to professional and technical personnel in the field.
Technical scheme is illustrated above in association with drawings and examples, but these accompanying drawings and explanation are not
Make sense to limit the scope of the present invention.Those skilled in the art should know that the present invention is not by above-mentioned implementation
The limitation of example and accompanying drawing, its protection domain is defined by appended claims, any without departing from the claims in the present invention
Book define in the range of various changes, the technical scheme that is formed of modification, all spirit and technology without departing from the present invention
Essence, still can belong within scope of the presently claimed invention.
Claims (4)
1. a kind of condensate discharge structure of top row vapour safety relief valve outlet side, described safety relief valve is included to drive dress
Driving spheroid with holes is put to be rotated by 90 ° with the hard sealing pressure relief ball valve for superpressure steam of releasing and drive guide's valve events with drive device
And driving main valve clack to open the electromagnetic relief valve for discharging steam, the discharge of steam end of safety relief valve is located at the top of valve,
Valve body (2) upper end is provided with exhaust steam end connector (1), and the lower end of exhaust steam end connector (1) is connected by flange and valve body (2) upper end
Connect while and compress valve seat (4), the steam (vapor) outlet end of exhaust steam end connector (1) is used to connect with gland steam exhauster with flange, its spy
Sign is：Condensate discharge structure, described condensate discharge structure are provided between exhaust steam end connector (1) and valve seat (4)
Annular cavity-interior hydroecium (5) and the outer water chamber (8) of two concentric arrangements are provided with the cylindrical outside in upper end of valve seat (4),
Interior hydroecium (5) is located at the cylindrical outside in valve seat (4) upper end and outer water chamber (8) is then located at the outside of interior hydroecium (5), interior hydroecium (5)
It is separated by between outer water chamber (8) with middle separate (7) down extend from exhaust steam end connector (1), annular, middle interval
Certain gap-through-flow gap (6) is provided between the plane on the downside of it at the lower surface of disconnected (7), makes interior hydroecium (5)
It is connected with outer water chamber (8)；The aperture that exhaust steam end connector (1) lumen orifice is located on the upside of valve seat (4) at adjacent regions is more than valve
Aperture at seat (4) center-aisle hole upper end aperture, between the cylindrical place in valve seat (4) upper end and exhaust steam end connector (1) lumen orifice
Leaving the gap of annular makes the intracavity inter-connection of interior hydroecium (5) and exhaust steam end connector (1)；In the cylindrical on the upper side of outer water chamber (8)
Opening position is outwards provided with osculum (9), and the outer end of osculum (9) is provided with drainage joint (10).
2. the condensate discharge structure of top row vapour safety relief valve outlet side according to claim 1, it is characterised in that：
Pad (3) is provided with the boss plane that valve seat (4) is compressed by exhaust steam end connector (1).
3. the condensate discharge structure of top row vapour safety relief valve outlet side according to claim 1, it is characterised in that：Row
Water swivel (10) uses pipe fitting, the osculum (9) being arranged on threaded engagement on the lower end flange excircle of exhaust steam end connector (1)
Exit.
4. the condensate discharge structure of top row vapour safety relief valve outlet side according to claim 1, it is characterised in that：Row
Water swivel (10) uses the steel pipe of certain length, the osculum (9) being welded on the lower end flange excircle of exhaust steam end connector (1)
Exit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410755911.5A CN104456056B (en) | 2014-12-08 | 2014-12-08 | A kind of condensate discharge structure of top row vapour safety relief valve outlet side |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410755911.5A CN104456056B (en) | 2014-12-08 | 2014-12-08 | A kind of condensate discharge structure of top row vapour safety relief valve outlet side |
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| CN104456056A CN104456056A (en) | 2015-03-25 |
| CN104456056B true CN104456056B (en) | 2018-01-23 |
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| CN201410755911.5A Active CN104456056B (en) | 2014-12-08 | 2014-12-08 | A kind of condensate discharge structure of top row vapour safety relief valve outlet side |
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| CN106610231B (en) * | 2016-12-28 | 2019-07-12 | 渤海造船厂集团有限公司 | A kind of negative pressure air cooler condensate system drainage method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2275182Y (en) * | 1996-08-18 | 1998-02-25 | 王恩岐 | Free floating ball type steam trap |
| CN2314194Y (en) * | 1997-07-25 | 1999-04-14 | 王军 | Discharge valve with pivotal level and floating ball |
| JP5901934B2 (en) * | 2011-10-19 | 2016-04-13 | 株式会社テイエルブイ | steam trap |
| CN203363642U (en) * | 2013-05-28 | 2013-12-25 | 中国人民解放军海军工程大学 | Thermal-insulation-type combined steam drain valve with spherical sealing stop valve body |
| CN104048154A (en) * | 2014-06-11 | 2014-09-17 | 成都科力夫科技有限公司 | Drain-off device for preventing generation of steam locking favorably |
| CN204420552U (en) * | 2014-12-08 | 2015-06-24 | 章华 | A kind of water of condensation discharge structure pushing up steam discharge safety relief valve outlet side |
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