CN204062052U - A kind of reheater safety valve - Google Patents
A kind of reheater safety valve Download PDFInfo
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- CN204062052U CN204062052U CN201420472574.4U CN201420472574U CN204062052U CN 204062052 U CN204062052 U CN 204062052U CN 201420472574 U CN201420472574 U CN 201420472574U CN 204062052 U CN204062052 U CN 204062052U
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Abstract
The utility model discloses a kind of reheater safety valve, comprise valve seat, valve body, valve gap, flap seat, flap, valve rod, guide sleeve, spring, adjustment screw rod; Valve rod is connected with flap seat by flap nut; The lower end of spring is by lower spring cup and valve stem contacts.The radiator one bottom outer side wall being offered a regulator hole is set between valve body and valve gap, a screw press is installed in this regulator hole; Valve rod is installed an adjusting nut; Radiator, guide sleeve, valve rod, flap seat, flap nut, adjusting nut and screw press form a back pressure cavity; Arrange a needle bearing by a bearing cap between upper spring seat and adjustment screw rod, the surface of contact between this bearing cap and adjustment screw rod is sphere; The middle part outer wall of flap arranges a support ring, and a seal ring is extended in inside and to declivity 30 ° mode in the outside of the bottom surface of this support ring.Reheater safety valve of the present utility model can realize at less Blowdown of a safety valve seat next time, sealing and reliability more excellent.
Description
Technical field
The utility model relates to a kind of reheater safety valve.
Background technique
Reheater safety valve is the overpressure protector that a kind of ultra supercritical thermal power station reheater is imported and exported.10, the supporting reheater safety valve of next gigawatt ultra supercritical unit of ordinary circumstance, is arranged on the pipeline of unit reheater gateway respectively.Reheater safety valve relies on the strength of spring to be pressed on valve seat by spool, makes arranged at safety valve in closed condition, is subject to the power of steam upwards jack-up spool below.During normal operation, the downward impacting force of spring is greater than steam thrust upwards, and valve is in closed condition.When vapor pressure reach safety valve rise seat pressure time, the active force of steam to spool is greater than the active force of spring, makes spool jack-up, safety valve steam discharge.The tightness of spring is changed, with regard to a seat pressure of adjustable safety valve by the adjustment screw rod on valve rod top.The discharge capacity of reheater safety valve applying working condition is large, temperature, pressure is high, and the larynx footpath of valve is large, Blowdown of a safety valve is little.Therefore reheater safety valve will meet the requirement that less Blowdown of a safety valve returns seat, and existing reheater safety valve exists following defect:
1) valve rod adopts the structure of upper Adjusting ring and lower Adjusting ring, not easily realizes valve at less Blowdown of a safety valve seat next time;
2) angle of inclination on the elastic groove inclined-plane of flap is 45 °, makes reheater safety valve there is leakage when high temperature;
3) lower end adjusting screw rod adopts the thrust-bearing that volume is larger, not only take up space large, and by the spring of large rigidity, adjustment screw rod is directly contacted with upper spring seat, make the lower end of adjustment screw rod produce friction and damage, and it is larger to adjust friction torque when screw rod regulates.
Model utility content
The purpose of this utility model is the defect overcoming prior art, provides a kind of reheater safety valve, and it is comparatively changed places and achieves valve at less Blowdown of a safety valve seat next time, sealability and unfailing performance more excellent.
The purpose of this utility model is achieved in that a kind of reheater safety valve, comprise valve seat, be located at valve body, valve gap and safety cover on valve seat successively, be located at valve body in and be positioned at the flap seat on valve seat, the flap being fixed on flap seat, lower end abutment the inner bottom surface of flap valve rod, be fixed on valve body and be enclosed within guide sleeve outside flap seat slidably, be located at valve gap and be enclosed within spring outside valve rod, adjustment screw rod by the upper-end contact of upper spring seat and spring; Described valve rod is connected with described flap seat by flap nut; The lower end of described spring is by lower spring cup and described valve stem contacts; Wherein, between the upper end of described valve body and the lower end of described valve gap, a radiator is set, a regulator hole offered by the lower outside wall of this radiator, install one in this regulator hole with cone headed screw press; Described valve rod is installed the adjusting nut that a lower external face is conical surface, the bottom of this adjusting nut is arranged in the lower end through hole of described radiator; The top inner chamber of the lower lumen of described radiator, the top inner chamber of guide sleeve, valve rod, flap seat, flap nut, adjusting nut and screw press form a back pressure cavity; Arrange a needle bearing by a bearing cap between described upper spring seat and described adjustment screw rod, the surface of contact between this bearing cap and described adjustment screw rod is sphere; The U-shaped structural member of described flap to be bottom surface be circular cone arc, the middle part outer wall of this flap arranges a support ring, a seal ring is extended in inside and to declivity 30 ° mode in the outside of the bottom surface of this support ring, makes the lower end surface of seal ring form the resilient seal surface contacted with the upper-end surface of described valve seat.
Above-mentioned reheater safety valve, wherein, the bottom outer wall of described guide sleeve arranges Adjusting ring on.
Above-mentioned reheater safety valve, wherein, the external wall of upper portion of described valve seat is arranged Adjusting ring.
Above-mentioned reheater safety valve; wherein; the top of described valve rod also connects a manual lifting gear, and this hand hoisting mechanism is comprised one and to be fixed on valve rod by hoisting nut and the cross bar be hinged on described safety cover and to be hinged on safety cover and to be positioned at the spanner of cross bar lower end.
Above-mentioned reheater safety valve, wherein, described screw press also arranges a look nut.
Reheater safety valve of the present utility model compared with prior art has following features:
1) by arranging back pressure cavity on valve, and adopting adjusting nut and screw press regulation structure, adding mean of calculating, more easily realizing valve at less Blowdown of a safety valve seat next time;
2) adopt elastic cone flap, the tilt angle on elastic groove inclined-plane is 30 °, sealability and reliability when improve reheater safety valve high temperature, and sealability even can bring up to zero leakage;
3) adjust and adopt needle bearing between screw rod and upper spring seat and the structure increasing bearing cap, avoid large rigidity spring to make adjustment screw rod directly contact with upper spring seat the friction produced to damage, decrease friction torque during Set pressure adjustment simultaneously, and needle bearing substitutes thrust-bearing, part space can also be saved; Bearing cap adopts sphere-contact with adjustment screw rod in addition, can eliminate the processing and assembling error of spring and valve rod part, be more conducive to the even transmission of power.
Accompanying drawing explanation
Fig. 1 is the structural representation of reheater safety valve of the present utility model;
Fig. 2 is the enlarged view at the A position in Fig. 1;
Fig. 3 is the enlarged view at the B position in Fig. 1;
Fig. 4 is the enlarged view at the C position in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Refer to Fig. 1 to Fig. 4; a kind of reheater safety valve of the present utility model, comprise valve seat 1, be located at valve body 2, valve gap 16 and safety cover 25 on valve seat 1 successively, be located in valve body 2 and be positioned at the flap seat 6 on valve seat 1, the flap 5 being fixed on flap seat 6, lower end abutment the inner bottom surface of flap 5 valve rod 10, be fixed on valve body 2 and be enclosed within guide sleeve 9 outside flap seat 6 slidably, be located at valve gap 16 and be enclosed within spring 18 outside valve rod 10, adjustment screw rod 22 by the upper-end contact of upper spring seat 19 and spring 18.
The lower end of spring 18 is contacted with valve rod 10 by lower spring cup 17.
One radiator 13 is set between the upper end of valve body 2 and the lower end of valve gap 16, to reduce the impact of high temperature on the performance of the rigidity of spring 18 and whole valve, a regulator hole offered by the lower outside wall of this radiator 13, install one in this regulator hole with cone headed screw press 11, this screw press 11 is also socketed a look nut 12.
Valve rod 10 is connected with flap seat 6 by flap nut 15; Valve rod 10 is installed the adjusting nut 14 that a lower external face is conical surface, the bottom of this adjusting nut 14 is arranged in the lower end through hole of radiator 13.
The top inner chamber of the lower lumen of radiator 13, the top inner chamber of guide sleeve 9, valve rod 10, flap seat 6, flap nut 15, adjusting nut 14 and screw press 11 form a back pressure cavity.
When valve is when opening, flap 5, flap seat 6, flap nut 15 move upward together with valve rod 10, increased gradually along with the Lift of valve by the medium water conservancy diversion cross section formed between the adjusting nut 14 on valve rod 109 and the lower end through hole of radiator 13, thus cause the pressure in back pressure cavity to reduce, be conducive to valve and reach full-gear.Otherwise, when the valve is closed, along with the closedown of valve, the medium water conservancy diversion cross section formed between the lower end through hole of adjusting nut 14 and radiator 13 diminishes gradually, pressure in back pressure cavity increases, and effectively in valve closing, makes valve at lower Blowdown of a safety valve seat next time.In addition, the medium water conservancy diversion cross section formed between adjustment screw press 11 and the regulator hole of radiator 13 also can change the pressure in back pressure cavity.
Arrange a needle bearing 20 by a bearing cap 21 between upper spring seat 19 and adjustment screw rod 22, this needle bearing 20 can reduce the frictional force between upper spring seat 19 and adjustment screw rod 22, can also save part space; Surface of contact between this bearing cap 21 and adjustment screw rod 22 is sphere, not only eliminate spring (18 and the processing and assembling error of valve rod 10, also help the even transmission of power.
Flap 6 for bottom surface be the U-shaped structural member of circular cone arc, the middle part outer wall of this flap 6 arranges a support ring, a seal ring is extended in inside and to declivity 30 ° mode in the outside of the bottom surface of this support ring, makes the lower end surface of seal ring form a resilient seal surface contacted with the upper-end surface of valve seat 1.Sealability and reliability when improve reheater safety valve high temperature, sealability even can bring up to zero leakage.
The bottom outer wall of guide sleeve 9 arranged Adjusting ring 8 on one and arrange a fastening screw 7.
The external wall of upper portion of valve seat 1 is arranged Adjusting ring 3 arrange fastening screw 4.
The top of valve rod 10 also connects a manual lifting gear, and this hand hoisting mechanism is comprised one and to be fixed on valve rod 10 by hoisting nut 24 and to be hinged on cross bar on safety cover 25 23 and and to be hinged on safety cover 25 and the spanner 26 being positioned at cross bar 23 lower end.When flap 5 needs to promote, spanner 26 is rotarily driven valve rod 10 and flap 5 moves up, flap 5 is departed from the sealing surface of valve seat 1.
Reheater safety valve of the present utility model, in normal conditions, when the pressure of medium is less than the closing force of flap 5, flap 5 is in closed state, and namely valve is in closed condition.When upstream pressure reaches the Set pressure value of safety valve; namely when the pressure of medium is greater than the closing force of flap 5; flap is in opening state; namely the medium in valve opening bleed-off system); along with medium is discharged and pressure drop from system, when system pressure drops to Reseating pressure of a safety valve, valve is closed automatically; thus overpressure protection effect is played to system, be unlikely to too much for intrasystem pressure releasing again.
Above embodiment is only for illustration of the utility model, but not to restriction of the present utility model, person skilled in the relevant technique, when not departing from spirit and scope of the present utility model, various conversion or modification can also be made, therefore all equivalent technological schemes also should belong to category of the present utility model, should be limited by each claim.
Claims (5)
1. a reheater safety valve, comprise valve seat, be located at valve body, valve gap and safety cover on valve seat successively, be located at valve body in and be positioned at the flap seat on valve seat, the flap being fixed on flap seat, lower end abutment the inner bottom surface of flap valve rod, be fixed on valve body and be enclosed within guide sleeve outside flap seat slidably, be located at valve gap and be enclosed within spring outside valve rod, adjustment screw rod by the upper-end contact of upper spring seat and spring; Described valve rod is connected with described flap seat by flap nut; The lower end of described spring is by lower spring cup and described valve stem contacts; It is characterized in that,
Between the upper end of described valve body and the lower end of described valve gap, a radiator is set, a regulator hole offered by the lower outside wall of this radiator, install one in this regulator hole with cone headed screw press;
Described valve rod is installed the adjusting nut that a lower external face is conical surface, the bottom of this adjusting nut is arranged in the lower end through hole of described radiator;
The top inner chamber of the lower lumen of described radiator, the top inner chamber of guide sleeve, valve rod, flap seat, flap nut, adjusting nut and screw press form a back pressure cavity;
Arrange a needle bearing by a bearing cap between described upper spring seat and described adjustment screw rod, the surface of contact between this bearing cap and described adjustment screw rod is sphere;
The U-shaped structural member of described flap to be bottom surface be circular cone arc, the middle part outer wall of this flap arranges a support ring, a seal ring is extended in inside and to declivity 30 ° mode in the outside of the bottom surface of this support ring, makes the lower end surface of seal ring form the resilient seal surface contacted with the upper-end surface of described valve seat.
2. reheater safety valve according to claim 1, is characterized in that, the bottom outer wall of described guide sleeve arranges Adjusting ring on.
3. reheater safety valve according to claim 1, is characterized in that, the external wall of upper portion of described valve seat is arranged Adjusting ring.
4. reheater safety valve according to claim 1; it is characterized in that; the top of described valve rod also connects a manual lifting gear, and this hand hoisting mechanism is comprised one and to be fixed on valve rod by hoisting nut and the cross bar be hinged on described safety cover and to be hinged on safety cover and to be positioned at the spanner of cross bar lower end.
5. reheater safety valve according to claim 1, is characterized in that, described screw press also arranges a look nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420472574.4U CN204062052U (en) | 2014-08-21 | 2014-08-21 | A kind of reheater safety valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420472574.4U CN204062052U (en) | 2014-08-21 | 2014-08-21 | A kind of reheater safety valve |
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| Publication Number | Publication Date |
|---|---|
| CN204062052U true CN204062052U (en) | 2014-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420472574.4U Active CN204062052U (en) | 2014-08-21 | 2014-08-21 | A kind of reheater safety valve |
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| Country | Link |
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| CN (1) | CN204062052U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105257873A (en) * | 2015-10-14 | 2016-01-20 | 武汉锅炉集团阀门有限责任公司 | Controllable double-protection fall lift spring safety valve and boiler steam-water system |
| CN105889585A (en) * | 2016-06-08 | 2016-08-24 | 哈电集团哈尔滨电站阀门有限公司 | Novel full-bore type safety valve |
| CN106523748A (en) * | 2016-12-01 | 2017-03-22 | 扬中市阀门厂有限公司 | Quick-closed power station safety valve |
| CN112576768A (en) * | 2020-12-21 | 2021-03-30 | 纽威石油设备（苏州）有限公司 | Adjustable pressure release valve |
| CN114263771A (en) * | 2021-12-08 | 2022-04-01 | 北京航天石化技术装备工程有限公司 | Back pressure cavity for high-performance steam safety valve |
-
2014
- 2014-08-21 CN CN201420472574.4U patent/CN204062052U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105257873A (en) * | 2015-10-14 | 2016-01-20 | 武汉锅炉集团阀门有限责任公司 | Controllable double-protection fall lift spring safety valve and boiler steam-water system |
| CN105889585A (en) * | 2016-06-08 | 2016-08-24 | 哈电集团哈尔滨电站阀门有限公司 | Novel full-bore type safety valve |
| CN106523748A (en) * | 2016-12-01 | 2017-03-22 | 扬中市阀门厂有限公司 | Quick-closed power station safety valve |
| CN106523748B (en) * | 2016-12-01 | 2024-04-02 | 扬中市阀门厂有限公司 | Power station relief valve of quick closing |
| CN112576768A (en) * | 2020-12-21 | 2021-03-30 | 纽威石油设备（苏州）有限公司 | Adjustable pressure release valve |
| CN114263771A (en) * | 2021-12-08 | 2022-04-01 | 北京航天石化技术装备工程有限公司 | Back pressure cavity for high-performance steam safety valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 201814 Shanghai public road, Jiading District, No. 111 Patentee after: Shanghai valve factory Limited by Share Ltd Address before: 201814 Shanghai public road, Jiading District, No. 111 Patentee before: Shanghai Valve Factory Co., Ltd. |