CN204420260U - The top bilateral steam exhaust structure of safety relief valve - Google Patents
The top bilateral steam exhaust structure of safety relief valve Download PDFInfo
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- CN204420260U CN204420260U CN201420777583.4U CN201420777583U CN204420260U CN 204420260 U CN204420260 U CN 204420260U CN 201420777583 U CN201420777583 U CN 201420777583U CN 204420260 U CN204420260 U CN 204420260U
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Abstract
The utility model discloses a kind of top bilateral steam exhaust structure of safety relief valve, described safety relief valve is provided with steam discharge three-way body on the upside of valve body and valve seat, steam discharge three-way body to be connected with valve body simultaneously with lower end adpting flange and to compress valve seat, the passage of steam discharge three-way body upwards forms three-way type structure toward the shunting of arranged on left and right sides direction from centre, and left and right horizontal passage is provided with adpting flange for being connected with exhaust steam pipe at two ends end symmetric; Left and right horizontal passage at two ends with from aperture to the tapering that inner diameter reduces gradually; The material of steam discharge three-way body is stainless steel material; Water of condensation container structure is provided with between steam discharge three-way body lower end and valve seat.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 leaking problem, can prevent oxidation corrosion product and impurity from entering the sealing reliability affecting valve near valve sealing face, valve is worked more reliably.
Description
Technical field
The utility model relates to a kind of valve mechanism, is specifically related to the product structure 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 setting 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, and a class drives spheroid half-twist with holes with the hard sealing pressure relief ball valve of superpressure steam of upwards releasing with drive unit; Another kind of is drive guide's flap with drive unit and drive the electromagnetic relief valve of the leading type of main valve clack action.Wherein, the structure type of the solenoid blowout valve product of leading type is divided into again two kinds, be adopt main valve clack sealing surface upward, the form of top steam discharge, auxiliary valve point side dress, another kind be adopt main valve clack sealing surface down, the exhaust of left and right bilateral, main valve and auxiliary valve integral design structure; Main valve clack upward, thus the structure of top steam discharge, auxiliary valve point side dress have more application because valve flowing channel pattern is comparatively simple, valve body can adopt forge welding structure to manufacture in fired power generating unit, and the electromagnetic relief valve that the technical solution of the utility model is addressed also is for such electromagnetic relief valve product.
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.Be arranged in the many use problems existing for safety relief valve product on valve top at existing discharge of steam end, 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 the structure from valve top part upwards steam discharge, 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.The safety relief valve that heat power plant boiler is installed and used, many products often in use for some time sealing surface namely can there is leakage phenomenon and even can leak greatly.
In order to alleviate the impact of water of condensation on safety relief valve sealing surface, also have the product of some producers to be provided with water of condensation discharge structure in steam (vapor) outlet side, the electromagnetic relief valve product (Fig. 1) and pneumatic the opening soon that are respectively U.S. De Laisai-Kang Suo Reed (Dresser-Consolidated) company as depicted in figs. 1 and 2 seal pressure relief ball valve (Fig. 2) adds weep hole and drainage joint schematic diagram at the lower flange place of outlet adpting flange firmly.Although this setting can emit the water of condensation of a part, but still may have water of condensation from closure member to aperture, valve seat upper end or in this section of weep hole aperture 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 and technology, 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 the phenomenon of drain water piping when effectively can eliminate discharge of steam, ensure the top bilateral steam exhaust structure of the power station main steam system electromagnetic relief valve of valve reliably working.
To achieve these goals, the utility model is by the following technical solutions:
A top bilateral steam exhaust structure for safety relief valve, 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, and during steam discharge, steam is upwards discharged by the center-aisle hole being positioned at the valve seat on the upside of closure member.Main technical schemes of the present utility model is: in the upside of valve body and valve seat, be provided with steam discharge three-way body, the intermediate vertical beneath galleries of steam discharge three-way body to be connected simultaneously with valve body with lower end adpting flange and to compress valve seat, the passage of steam discharge three-way body upwards forms three-way type structure toward the shunting of arranged on left and right sides direction from centre, and left and right horizontal channel is provided with exhaust steam end adpting flange for being connected with steam discharge elbow at two ends end symmetric.
In order to realize expecting object better, the utility model also adds following further technological scheme simultaneously:
The left and right horizontal channel of steam discharge three-way body at two ends with near aperture or aperture to the tapering that inner diameter reduces gradually.
The material of steam discharge three-way body is stainless steel material.
Between steam discharge three-way body lower end and valve seat, be provided with the cavity-hydroecium of annular, described hydroecium surrounded by the step hole of the valve seat cylindrical on the upside of plane on boss outside valve seat and its and steam discharge three-way body intermediate vertical passage lower end; The aperture that steam discharge three-way body intermediate vertical passage lower end 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 steam discharge three-way body intermediate vertical passage lower end lumen orifice makes the intracavity inter-connection of hydroecium and steam discharge three-way body; Plane place on the boss that valve seat is compressed by steam discharge three-way body is also provided with pad.
Electromagnetic relief valve described in the utility model, its drive unit comprises the drive unit being provided active force by electromagnet, and provides the drive unit of active force by electromagnetic valve pneumatic mechanism.
The beneficial effects of the utility model are: after adopting top of the present utility model bilateral steam exhaust structure technological scheme, existing main steam system top, power station steam discharge safety relief valve outlet side water of condensation existing in use can be solved enter near valve sealing face and cause 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, can effectively avoid blowing back into drain water piping and bringing impact to the operation of other valve and equipment during discharge of steam, valve is worked more reliably, ensure unit safety operation.
Accompanying drawing explanation
Fig. 1 is the electromagnetic relief valve schematic diagram adding condensation water drainage hole of prior art-De Laisai-Kang Suo Reed company of the U.S..
Fig. 2 is the hard sealing pressure relief ball valve schematic diagram adding condensation water drainage hole of prior art-De Laisai-Kang Suo Reed company of the U.S..
Fig. 3 is the schematic diagram that the utility model embodiment one-electromagnetic relief valve have employed the primary valve part of top bilateral steam exhaust structure.
Fig. 4 is the left-hand view of the primary valve part of Fig. 3.
Fig. 5 is the schematic diagram that the utility model embodiment two-hard sealing pressure relief ball valve have employed the valve part of top bilateral steam exhaust structure.
Fig. 6 is the left-hand view of the valve part of Fig. 5.
In figure, 1, valve body; 2, valve seat; 3, pad; 4, steam discharge three-way body; 5, lower end adpting flange; 6, exhaust steam end adpting flange; 7, hydroecium.
Embodiment
Below in conjunction with drawings and Examples, the technical solution of the utility model is further elaborated.
Embodiment one
The structural representation that embodiment's one-the technical solution of the utility model is applied on the steam discharge electromagnetic relief valve product of top as shown in Figure 3 and Figure 4.
This electromagnetic relief valve is the auxiliary valve split-type structural of main valve, auxiliary valve is arranged on the side of main valve, be connected with main valve with auxiliary support structure by connecting tube, being directed upwardly of main valve clack sealing surface, the discharge of steam end of valve is positioned at the top of main valve, during valve steam discharge, drive unit drives pilot valve action and drives main valve clack to open discharged steam downwards, and during steam discharge, steam is upwards discharged by the center-aisle hole being positioned at the valve seat (2) on the upside of main valve clack.
In the upside of valve body (1) and valve seat (2), be provided with steam discharge three-way body (4), the intermediate vertical beneath galleries of steam discharge three-way body (4), be connected with the flange of bolt linkage structure with valve body (1) upper end by lower end adpting flange (5), simultaneously lower end adpting flange (5) plane on the boss compressing valve seat (2) outside with the step plane at its lower end surface place, the center-aisle hole of valve seat (2) is upwards the intermediate vertical passage of steam discharge three-way body (4), the intermediate vertical passage of steam discharge three-way body (4) is upwards turned left, right two side direction shuntings form three-way type structure, left, right horizontal channel is provided with exhaust steam end adpting flange (6) at two ends end symmetric, for the connection with steam discharge elbow, steam discharge three-way body (4) left and right horizontal channel at two ends with near aperture to the tapering that inner diameter reduces gradually.Steam discharge three-way body (4) adopts stainless cast steel part processing, and its middle vertical passage adopts to the turning point of horizontal channel, both sides the arced flow path smooth transition that turns to gradually and shunting the shunting cambered surface of top self-assembling formation taper at position.
The present embodiment is also provided with water of condensation container structure between steam discharge three-way body (4) and valve seat (2), described water of condensation container structure is the cavity-hydroecium (7) being provided with annular between steam discharge three-way body (4) lower end and valve seat (2), and described hydroecium (7) surrounded by plane on the boss of valve seat (2) outside and valve seat (2) cylindrical on the upside of it and the step hole processed of steam discharge three-way body (4) intermediate vertical passage lower end; The aperture that steam discharge three-way body (4) intermediate vertical passage lower end is positioned at adjacent regions place, valve seat (2) upside is greater than the aperture at toroidal aperture, upper end, valve seat (2) center-aisle hole place; Between cylindrical place, valve seat (2) upper end and steam discharge three-way body (4) intermediate vertical passage lower end lumen orifice, and leave the gap of annular, make the intracavity inter-connection of hydroecium (7) and steam discharge three-way body (4); In addition, plane place on the boss that valve seat (2) is compressed by steam discharge three-way body (4), and be provided with pad (3).
During valve steam discharge, drive unit drives the guide's sealing configuration action in auxiliary valve, under connecting the connecting tube of major-minor valve and making the main valve clack in main valve lose the effect of back pressure, main valve clack side pressure medium thereon, opens discharged steam downwards.The steam of discharging through valve seat (2) center-aisle hole and steam discharge three-way body (4) intermediate vertical passage upwards, turns to left and right substantially horizontal on steam discharge three-way body (4) top, and the steam discharge elbow connected by two ends is discharged.Steam discharge three-way body (4) top turning point is owing to adopting the arced flow path that turns to gradually and having because adopting arced flow path and the tapered shunting cambered surface of self-assembling formation in shunting position top tape, enable steam olderly flowage, vibration when steam can be avoided to make steam discharge shunting position and producing stronger eddy current and noise strengthen.When valve returns to closed condition, the a large amount of steam retained in baffler blow-off line down after discharge of steam can coagulate water by exhaust steam pipe except a part after condensation gradually and connect dish and enter except drain water piping, the upwards in line mode adopted from existing product due to the vapor discharge channel on steam discharge three-way body (4) top is improved to and is folded to left and right horizontal direction and the mode of upwards being discharged by steam discharge elbow, and the two ends, horizontal channel of steam discharge three-way body (4) large with aperture in the bottom of young tapering steam discharge elbow simultaneously can with drain nozzle, thus coagulate water from exhaust steam pipe and connect the intermediate vertical passage that water of condensation that dish produces toward lower portion also can not enter steam discharge three-way body (4), in addition, a small amount of water of condensation that steam discharge three-way body (4) lumen produces, hydroecium (7) can be entered by the annular space between cylindrical place, valve seat (2) upper end and steam discharge three-way body (4) along the inwall of steam discharge three-way body (4) intermediate vertical passage, surface due to the valve seat (2) of hydroecium (7) inwall affects temperature by the heat transfer of bottom high-temperature steam can be higher, the water of condensation thus entered in hydroecium (7) can vaporize gradually again and disperse in steam discharge three-way body (4) and exhaust steam pipe cavity, the endoporus of valve seat (2) is because temperature higher (higher than 100 DEG C) thus can't form water of condensation on its surface.Because hydroecium (7) and steam discharge three-way body (4) inner chamber do not arrange the waste pipe being outwards connected to drain water piping, thus there is not steam and blow back into drain water piping and the problem that impact may be brought the operation of other valve and equipment.Therefore, the technical solution of the 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.
When main valve clack closed condition, when have oxidation corrosion product and impurity dirty with water of condensation, same meeting enters drain water piping with water of condensation from the weep hole of steam discharge elbow lower end or is trapped in steam discharge elbow, if have a small amount of oxidation corrosion product etc. enter steam discharge three-way body (4) interior time, also can flow into the inwall of water of condensation along steam discharge three-way body (4) intermediate vertical passage and accumulate in hydroecium (7), and can not flow to and be trapped near main valve clack sealing surface; On this basis, because steam discharge three-way body (4) adopts stainless cast steel part processing, thus also no longer there is oxidation corrosion product and drop to problem near main valve clack sealing surface.Therefore, the technical solution of the utility model eliminates oxidation corrosion product that existing top steam discharge electromagnetic relief valve product easily occurs and impurity brings the problem of impact to valve seal.
Embodiment two
The structural representation that embodiment's two-the technical solution of the utility model is applied on hard sealing pressure relief ball valve product as shown in Figure 5 and Figure 6.
The hard sealing valve body (1) of pressure relief ball valve and the upside of valve seat (2) are provided with steam discharge three-way body (4), the intermediate vertical beneath galleries of steam discharge three-way body (4), be connected with valve body (1) by lower end adpting flange (5), simultaneously, lower end adpting flange (5) also compresses the boss outside valve seat (2) with the step plane of its lower end surface, the intermediate vertical passage of steam discharge three-way body (4) is upwards turned left, right two side direction shuntings form three-way type structure, left, right horizontal channel is provided with exhaust steam end adpting flange (6) for the connection with steam discharge elbow at two ends end symmetric, steam discharge three-way body (4) left and right horizontal channel at two ends with near aperture to the tapering that inner diameter reduces gradually, steam discharge three-way body (4) adopts stainless cast steel part processing, water of condensation container structure is provided with: between steam discharge three-way body (4) lower end and the valve seat (2) between steam discharge three-way body (4) and valve seat (2), be provided with the cavity-hydroecium (7) of annular, hydroecium (7) surrounded by plane on the boss of valve seat (2) outside and valve seat (2) cylindrical on the upside of it and the step hole processed of steam discharge three-way body (4) intermediate vertical passage lower end, steam discharge three-way body (4) intermediate vertical passage lower end is positioned at the aperture at adjacent regions place, valve seat (2) upside, is greater than the aperture at aperture, upper end place, valve seat (2) center-aisle hole, between cylindrical place, valve seat (2) upper end and steam discharge three-way body (4) intermediate vertical passage and the gap leaving annular makes the intracavity inter-connection of hydroecium (7) and steam discharge three-way body (4).On the boss that this external valve seat (2) is compressed by steam discharge three-way body (4), plane place is also provided with pad (3).
During valve steam discharge, control system sends signal makes Pneumatic actuator drive spheroid fast rotational 90 ° and open and discharged steam, the steam of discharging through valve seat (2) center-aisle hole and steam discharge three-way body (4) intermediate vertical passage upwards, turn to left and right substantially horizontal on steam discharge three-way body (4) top, the steam discharge elbow connected by two ends is discharged.After valve closing, the steam condensation rear portion gradually retained in baffler blow-off line down can be coagulated water by exhaust steam pipe and be connect dish and enter drain water piping, because the vapor discharge channel on steam discharge three-way body (4) top is for being folded to left and right horizontal direction, upwards discharged by steam discharge elbow again and the two ends, horizontal channel of steam discharge three-way body (4) large with mouth in little tapering, simultaneously steam discharge elbow bottom and with drain nozzle, thus coagulate water from exhaust steam pipe and connect the intermediate vertical passage that water of condensation that dish produces toward lower portion can not enter steam discharge three-way body (4), in addition a small amount of water of condensation that steam discharge three-way body (4) lumen produces also can enter hydroecium (7) along the inwall of steam discharge three-way body (4) intermediate vertical passage, due to valve seat (2) surface by the heat transfer of bottom high-temperature steam affect the temperature water of condensation that can highlyer thus enter in hydroecium (7) can vaporize gradually again and disperse in steam discharge three-way body (4) and exhaust steam pipe cavity, the endoporus of valve seat (2) thus can't form water of condensation on its surface because temperature is higher.Hydroecium (7) and steam discharge three-way body (4) inner chamber do not arrange the waste pipe being outwards connected to drain water piping and thus there is not the problem that steam blows back into drain water piping.Equally when having oxidation corrosion product and impurity is dirty with water of condensation can enter drain water piping with water of condensation from the weep hole of steam discharge elbow lower end or be trapped in steam discharge elbow, also can flow into water of condensation once there be a small amount of oxidation corrosion product etc. to enter in steam discharge three-way body (4) and accumulate in hydroecium (7), and can not flow to and be trapped near ball seal face; Because steam discharge three-way body (4) have employed stainless cast steel part processing, thus also no longer there is the oxidation corrosion product that existing product easily occurs and drop to the problem near ball seal face, valve seal being brought to impact.
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. the top bilateral steam exhaust structure of a safety relief valve, 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, during steam discharge, steam is upwards discharged by the center-aisle hole being positioned at the valve seat (2) on the upside of closure member, it is characterized in that: in the upside of valve body (1) and valve seat (2), be provided with steam discharge three-way body (4), the intermediate vertical beneath galleries of steam discharge three-way body (4) to be connected simultaneously with valve body (1) with lower end adpting flange (5) and to compress valve seat (2), the passage of steam discharge three-way body (4) is upwards turned left from centre, right two side direction shuntings form three-way type structure, left, right horizontal channel is provided with exhaust steam end adpting flange (6) for being connected with steam discharge elbow at two ends end symmetric.
2. the top bilateral steam exhaust structure of safety relief valve according to claim 1, is characterized in that: steam discharge three-way body (4) left and right horizontal channel at two ends with near aperture or aperture to the tapering that inner diameter reduces gradually.
3. the top bilateral steam exhaust structure of safety relief valve according to claim 1, is characterized in that: the material of steam discharge three-way body (4) is stainless steel material.
4. the top bilateral steam exhaust structure of safety relief valve according to claim 1, it is characterized in that: the cavity-hydroecium (7) being provided with annular between steam discharge three-way body (4) lower end and valve seat (2), described hydroecium (7) surrounded by the step hole of plane and valve seat (2) cylindrical on the upside of it and steam discharge three-way body (4) intermediate vertical passage lower end on the boss of valve seat (2) outside; The aperture that steam discharge three-way body (4) intermediate vertical passage lower end is positioned at adjacent regions place, valve seat (2) upside is greater than the aperture at aperture, upper end place, valve seat (2) center-aisle hole, and the gap leaving annular between cylindrical place, valve seat (2) upper end and steam discharge three-way body (4) intermediate vertical passage lower end lumen orifice makes the intracavity inter-connection of hydroecium (7) and steam discharge three-way body (4); Plane place on the boss that valve seat (2) is compressed by steam discharge three-way body (4) is also provided with pad (3).
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| CN201420777583.4U CN204420260U (en) | 2014-12-08 | 2014-12-08 | The top bilateral steam exhaust structure of safety relief valve |
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| CN201420777583.4U CN204420260U (en) | 2014-12-08 | 2014-12-08 | The top bilateral steam exhaust structure of safety relief valve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104390043A (en) * | 2014-12-08 | 2015-03-04 | 章华 | Top bilateral steam exhaust structure of safety pressure relief valve |
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2014
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104390043A (en) * | 2014-12-08 | 2015-03-04 | 章华 | Top bilateral steam exhaust structure of safety pressure relief valve |
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