CN113983345A - Electric valve for draining main steam for steam turbine - Google Patents

Abstract

The invention discloses a steam turbine main steam drainage electric valve, which comprises a valve body shell and an L-shaped liquid discharge pipe communicated with the bottom of the valve body shell, wherein a liquid discharge opening and closing device is arranged in the valve body shell, and comprises a positioning pipe, a lifting pipe, a sealing part and an elastic extension part, wherein the top of the positioning pipe is connected with the top of the inner wall of the valve body shell, the lifting pipe is slidably connected with the inner wall of the positioning pipe, the sealing part is arranged at the bottom of the lifting pipe, and the elastic extension part is sleeved on the side walls of the positioning pipe and the lifting pipe; a water level detection device is arranged in the lifting pipe, and comprises a filtering water inlet component arranged on the side wall of the lifting pipe, a lifting airlock component covering the outside of the filtering water inlet component, a buoyancy component arranged on the inner wall of the lifting pipe and extending from the top end of the lifting pipe into the positioning pipe, and a distance measurement component arranged on the top of the inner wall of the positioning pipe; the bottom of the L-shaped liquid discharge pipe is provided with an electric opening device of which the execution end extends into the L-shaped liquid discharge pipe. The invention relates to a steam drainage electric valve with high reaction speed and stable drainage.

Description

Electric valve for draining main steam for steam turbine

Technical Field

The invention mainly relates to the technical field of steam drain valves, in particular to an electric valve for draining main steam for a steam turbine.

Background

The steam trap has the function of automatically discharging non-condensable gases such as steam condensate and air in heating equipment or a steam pipeline without leaking steam.

According to the patent document with the application number of CN200720128886.3, a corrugated pipe for a thermal static force drain valve and a corrugated pipe type drain valve are provided, the product comprises a valve body with an opening cavity, a valve cover, a valve seat, a valve clack and a corrugated pipe; a water outlet and a water vapor inlet are arranged in the cavity of the valve body, a water outlet interface and a water vapor inlet interface are arranged on the outer side of the valve body, and the valve cover is hermetically connected with the valve body at the opening of the cavity of the valve body; the valve seat is fixed on the water outlet in the cavity of the valve body through threaded connection, one end of the corrugated pipe, which is provided with a connecting shaft, is connected and fixed with the valve cover, and the valve clack is fixed at the other end of the corrugated pipe. The product improves the expansion elongation of the corrugated pipe by 10 percent, does not need to be adjusted frequently, and overcomes the problem that the corrugated pipe is bent when being heated, expanded and extended.

The product in the above-mentioned patent has improved bellows expansion percentage of elongation and has reached 10%, does not need often to adjust, has overcome the crooked problem of bellows appearance when the thermal expansion extends, nevertheless relies on the bellows thermal expansion shrinkage to carry out drainage control, and reaction time is long, has the untimely possibility of drainage.

Disclosure of Invention

The invention mainly provides an electric valve for draining main steam for a steam turbine, which is used for solving the technical problems in the background technology.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a steam turbine main steam drainage electric valve comprises a valve body shell, a liquid inlet pipe communicated with the side wall of the valve body shell, and an L-shaped liquid discharge pipe communicated with the bottom of the valve body shell, wherein a liquid discharge opening and closing device is arranged in the valve body shell, the liquid discharge opening and closing device comprises a positioning pipe, the top of the positioning pipe is connected with the top of the inner wall of the valve body shell, a lifting pipe, a sealing component and an elastic extension component, the lifting pipe is slidably connected with the inner wall of the positioning pipe, the bottom of the lifting pipe extends to the lower part of the positioning pipe, the sealing component is arranged at the bottom of the lifting pipe and used for sealing the L-shaped liquid discharge pipe, and the top end and the bottom end of the elastic extension component are respectively sleeved on the side wall of the positioning pipe and the side wall of the lifting pipe;

a water level detection device is arranged in the lifting pipe and comprises a filtering water inlet component, a lifting air lock component, a buoyancy component and a distance measurement component, wherein the filtering water inlet component is arranged on the side wall of the lifting pipe and is positioned between the elastic extension component and the sealing component;

and the bottom of the L-shaped liquid discharge pipe is provided with an electric opening device of which an execution end extends into the L-shaped liquid discharge pipe, and the electric opening device is used for moving the sealing component upwards when the distance value measured by the distance measuring component from the buoyancy component is smaller than a set value.

Preferably, the annular array of the side wall of the lifting pipe is provided with a plurality of anti-rotation bosses, and the inner wall of the positioning pipe is provided with anti-rotation grooves matched with the anti-rotation bosses. In the preferred embodiment, the anti-rotation boss is matched with the anti-rotation groove to prevent the lifting pipe and the positioning pipe from rotating relatively, so that the lifting pipe can be kept to lift stably.

Preferably, the sealing component comprises a circular truncated cone-shaped sealing block arranged at the bottom of the lifting pipe, and a sealing inclined plane which is arranged on the inner wall of the L-shaped liquid discharge pipe and matched with the circular truncated cone-shaped sealing block. In the preferred embodiment, the L-shaped drain pipe is conveniently sealed by the sealing component, and steam leakage is effectively prevented.

Preferably, the elasticity extension part includes that the top and bottom overlap respectively and locate the ripple outer tube of registration arm lateral wall and fall way lateral wall, and locate the gas pitcher at valve body shell top, the gas pitcher passes through pipeline intercommunication ripple outer tube. In the preferred embodiment, the elastic extension component can give a pushing force to the lifting pipe, so that the lifting pipe drives the sealing component to seal the L-shaped liquid discharge pipe.

Preferably, the inner wall of the corrugated outer sleeve is provided with an air pressure sensor, and the PLC receives pressure data of the air pressure sensor and opens a valve of the air tank so that air flow enters the corrugated outer sleeve until the pressure data is consistent with a set value. In the preferred embodiment, the PLC controller receives pressure data from the pressure sensor and opens the valve of the gas canister to allow gas flow into the bellows outer sleeve until the pressure data matches the set point to facilitate stable downward thrust on the elevator tube.

Preferably, it includes a plurality of water inlet through-holes that link up to filter the inflow part the fall way lateral wall, and locate the fall way outer wall and cover are located the outside filtration ring of water inlet through-hole. In the preferred embodiment, the water entering the riser is filtered by a filter water intake component.

Preferably, the lift airlock part is located including the cover annular kickboard of lift pipe outer wall, and locate annular kickboard bottom and cover are located filter the outside airlock cover pipe of the part of intaking. In the preferred embodiment, the sealing of the filtered water inlet component as steam enters the valve body is facilitated by the lifting airlock component.

Preferably, the buoyancy part is including locating the fall way inner wall just is located filter the spacing boss on water inlet part upper portion, the bushing of the spacing boss of bottom contact is located annular gasbag on the bushing locates plunger plate on the annular gasbag locates plunger plate top just extends to the connecting rod in the locating tube, and locates the range finding board on connecting rod top, fall way top intercommunication trachea bottom, trachea top intercommunication valve body shell inner wall top. In the preferred embodiment, the upward movement under the buoyancy of the water in the valve body is facilitated by the buoyancy member.

Preferably, the distance measuring component comprises a distance sensor arranged at the top of the inner wall of the positioning pipe and a limiting sleeve arranged at the top of the inner wall of the positioning pipe and sleeved outside the distance sensor, and the length of the limiting sleeve is greater than that of the distance sensor. In the preferred embodiment, the PLC controller receives the distance data measured by the distance sensor and the buoyancy member, and triggers the electric opening device when the distance data is smaller than a set value, so that the electric opening device pushes up the sealing member.

Preferably, the electric opening device comprises a driving cylinder arranged at the bottom of the L-shaped liquid discharge pipe, and the execution end of the driving cylinder penetrates through the bottom of the L-shaped liquid discharge pipe and is connected with a push rod. In the preferred embodiment, the electrically operated opening means may push the sealing member upwards by mechanical force.

Compared with the prior art, the invention has the beneficial effects that:

the valve can measure the water accumulation in the valve so as to realize the opening of the valve through mechanical force for liquid drainage, and has high reaction speed and high drainage efficiency;

the lifting pipe can be pushed by the elastic extension component so that the lifting pipe drives the sealing component to seal the L-shaped liquid discharge pipe, the PLC receives pressure data of the pressure sensor and opens a valve of the gas tank to enable gas flow to enter the corrugated outer sleeve until the pressure data is consistent with a set value so as to provide stable downward thrust for the lifting pipe, the L-shaped liquid discharge pipe is sealed by the sealing component so as to effectively prevent steam leakage, relative rotation between the lifting pipe and the positioning pipe can be prevented by matching the anti-rotation boss and the anti-rotation groove so as to keep the lifting pipe stably lifted, water entering the lifting pipe is filtered by the water filtering and feeding component, the water filtering and feeding component is sealed by the lifting gas locking component when steam enters the valve body and is moved upwards under the buoyancy action of accumulated water in the valve body by the buoyancy component, and the PLC receives distance data between the distance sensor and the buoyancy component, and when the distance data is smaller than the set value, the electric opening device is triggered to push the sealing part upwards, and the electric opening device can push the sealing part upwards by mechanical force.

The present invention will be explained in detail below with reference to the drawings and specific embodiments.

Drawings

FIG. 1 is an isometric view of the overall construction of the present invention;

FIG. 2 is an exploded view of the overall structure of the present invention;

FIG. 3 is an exploded view of the internal structure of the valve body housing of the present invention;

FIG. 4 is an exploded view of the structure of the water level detecting apparatus according to the present invention;

FIG. 5 is a side view of the overall structure of the present invention;

FIG. 6 is a cross-sectional view of the overall construction of the present invention;

FIG. 7 is a sectional view showing the structure of a water level detecting apparatus according to the present invention;

FIG. 8 is an enlarged view of the structure at A of the present invention.

Description of the drawings: 10. a valve body housing; 11. a liquid inlet pipe; 12. an L-shaped drain pipe; 20. a liquid discharge opening and closing device; 21. a positioning tube; 211. an anti-rotation groove; 22. a lifting pipe; 221. an anti-rotation boss; 23. a sealing member; 231. a truncated cone shaped sealing block; 232. sealing the inclined plane; 24. an elastic extension member; 241. a corrugated outer sleeve; 242. a gas tank; 243. an air pressure sensor; 30. a water level detection device; 31. a filtered water intake component; 311. a water inlet through hole; 312. a filter ring; 32. a lift airlock assembly; 321. an annular floating plate; 322. an airlock shroud; 33. a buoyant member; 331. a limiting boss; 332. a bushing; 333. an annular air bag; 334. a plunger plate; 335. a connecting rod; 336. a distance measuring plate; 337. an air tube; 34. a distance measuring part; 341. a distance sensor; 342. a limiting sleeve; 40. an electrically powered opening device; 41. a drive cylinder; 42. a push rod.

Detailed Description

In order to facilitate an understanding of the invention, the invention will now be described more fully hereinafter with reference to the accompanying drawings, in which several embodiments of the invention are shown, but which may be embodied in different forms and not limited to the embodiments described herein, but which are provided so as to provide a more thorough and complete disclosure of the invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may be present, and when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present, as the terms "vertical", "horizontal", "left", "right" and the like are used herein for descriptive purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the knowledge of the terms used herein in the specification of the present invention is for the purpose of describing particular embodiments and is not intended to limit the present invention, and the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Please refer to fig. 1, 2, 3, 5, and 6, in a preferred embodiment of the present invention, an electric valve for steam turbine main steam drainage includes a valve body housing 10, a liquid inlet pipe 11 communicating with a sidewall of the valve body housing 10, and an L-shaped liquid outlet pipe 12 communicating with a bottom of the valve body housing 10, a liquid outlet opening and closing device 20 is disposed in the valve body housing 10, the liquid outlet opening and closing device 20 includes a positioning pipe 21 having a top connected to a top of an inner wall of the valve body housing 10, a lifting pipe 22 slidably connected to an inner wall of the positioning pipe 21 and having a bottom end extending to a lower portion of the positioning pipe 21, a sealing member 23 disposed at a bottom of the lifting pipe 22 and used for sealing the L-shaped liquid outlet pipe 12, and an elastic extension member 24 having a top end and a bottom end respectively sleeved on a sidewall of the positioning pipe 21 and a sidewall of the lifting pipe 22; a plurality of anti-rotation bosses 221 are arranged on the annular array of the side wall of the lifting tube 22, anti-rotation grooves 211 matched with the anti-rotation bosses 221 are arranged on the inner wall of the positioning tube 21, the sealing member 23 includes a frustoconical sealing block 231 provided at the bottom of the elevator tube 22, and a sealing inclined surface 232 which is arranged on the inner wall of the L-shaped liquid discharge pipe 12 and is matched with the truncated cone-shaped sealing block 231, the elastic force extension part 24 comprises a corrugated outer sleeve 241 whose top end and bottom end are respectively sleeved on the side wall of the positioning tube 21 and the side wall of the lifting tube 22, and a gas tank 242 provided at the top of the valve body housing 10, the gas tank 242 communicating with the bellows outer tube 241 through a pipe, the inner wall of the corrugated outer sleeve 241 is provided with an air pressure sensor 243, the PLC controller receives pressure data of the air pressure sensor 243, and opens the valve of the cylinder 242 to allow air flow into the bellows jacket 241 until the pressure data matches the set point.

In this embodiment, in a normal state, the L-shaped liquid discharge pipe 12 is in a sealed state, and the elastic force extending member 24 can provide a downward pushing force to the elevator pipe 22, so that the elevator pipe 22 drives the sealing member 23 to seal the L-shaped liquid discharge pipe 12;

further, when the elastic force extension part 24 works, the corrugated outer sleeve 241 is in an extended state due to the fact that the internal air pressure of the corrugated outer sleeve 241 is large, so that the lifting pipe 22 is pushed downwards;

further, the PLC controller receives the pressure data from the pressure sensor 243 and opens the valve of the gas tank 242 to allow the gas flow into the corrugated outer tube 241 until the pressure data is consistent with the set value, so as to give a stable downward thrust to the elevator tube 22;

further, when the sealing component 23 works, the circular truncated cone-shaped sealing block 231 and the sealing inclined surface 232 are matched to form a good sealing effect, steam is effectively prevented from leaking through the L-shaped liquid discharge pipe 12, and the circular truncated cone-shaped sealing block 231 and the sealing inclined surface 232 are matched to limit the downward stroke of the lifting pipe 22;

further, the anti-rotation boss 221 and the anti-rotation groove 211 cooperate to prevent the elevator tube 22 and the positioning tube 21 from rotating relative to each other, so as to maintain the elevator tube 22 lifted stably.

Please refer to fig. 2, 4, 7 and 8, in another preferred embodiment of the present invention, a water level detecting device 30 is disposed in the lifting tube 22, the water level detecting device 30 includes a filtering water inlet member 31 disposed on a sidewall of the lifting tube 22 and located between the elastic extension member 24 and the sealing member 23, a lifting airlock member 32 disposed on a sidewall of the lifting tube 22 and covering an exterior of the filtering water inlet member 31, a buoyancy member 33 disposed on an inner wall of the lifting tube 22 and having a top end extending into the positioning tube 21, and a distance measuring member 34 disposed on a top of the inner wall of the positioning tube 21; the filtration water inlet component 31 comprises a plurality of water inlet through holes 311 which are communicated with the side wall of the lifting pipe 22, and is arranged on the outer wall of the lifting pipe 22 and is sleeved on the filtering ring 312 outside the water inlet through holes 311, the lifting airlock component 32 comprises an annular floating plate 321 sleeved on the outer wall of the lifting pipe 22, and is arranged at the bottom of the annular floating plate 321, and is covered on the airlock cover pipe 322 outside the filtration water inlet component 31, the buoyancy component 33 comprises a limiting boss 331 which is arranged on the inner wall of the lifting pipe 22 and is positioned on the upper part of the filtration water inlet component 31, a bushing 332 which is in contact with the limiting boss 331 at the bottom, an annular air bag 333 which is arranged on the bushing 332, a plunger plate 334 which is arranged on the annular air bag 333, a connecting rod 335 which is arranged at the top of the plunger plate 334 and extends into the positioning pipe 21, and a distance measuring plate 336 which is arranged at the top of the connecting rod 335, the top of the lifting pipe 22 is communicated with the bottom end of the air pipe 337, the top end of the air pipe 337 is communicated with the top of the inner wall of the valve housing 10, the distance measuring part 34 comprises a distance sensor 341 arranged at the top of the inner wall of the positioning pipe 21 and a limit sleeve 342 arranged at the top of the inner wall of the positioning pipe 21 and sleeved outside the distance sensor 341, and the length of the limit sleeve 342 is greater than that of the distance sensor 341.

It should be noted that, in this embodiment, when steam enters the valve body housing 10, the steam applies pressure to the annular floating plate 321, so that the airlock cover pipe 322 seals the filtering water inlet component 31, after condensed water accumulates in the valve body housing 10, the condensed water drives the annular floating plate 321 and the airlock cover pipe 322 to move upward, the condensed water enters the lifting pipe 22 after being filtered by the filtering water inlet component 31, and drives the buoyancy component 33 to move upward through buoyancy, the PLC controller receives data of the distance between the distance sensor 341 and the distance measuring plate 336, and triggers the electric opening device 40 when the distance data is smaller than a set value, so that the electric opening device 40 pushes up the sealing component 23, and when the distance data is greater than or equal to the set value, the electric opening device 40 is in a closed state;

further, the condensed water filtered by the filtering ring 312 enters the lifting pipe 22 through the water inlet through hole 311;

further, the condensed water drives the plunger plate 334, the connecting rod 335 and the ranging plate 336 to move upwards through buoyancy, air at the upper part of the plunger plate 334 is discharged out of the valve body shell 10 through the air pipe 337, and the leaked plate 332 and the annular air bag 333 are supported by the condensed water through buoyancy, so that the ranging plate 336 can be moved upwards quickly;

further, the distance sensor 341 may be protected by a limit sleeve 342.

Referring to fig. 3, 5 and 7 again, in another preferred embodiment of the present invention, an electric opening device 40 is disposed at the bottom of L-shaped liquid discharge pipe 12, and the execution end of electric opening device 40 extends into L-shaped liquid discharge pipe 12, and when the distance from buoyancy member 33 measured by distance measuring member 34 is smaller than a predetermined value, electric opening device 40 is used to move sealing member 23 upward, and electric opening device 40 includes a driving cylinder 41 disposed at the bottom of L-shaped liquid discharge pipe 12, and the execution end of driving cylinder 41 penetrates the bottom of L-shaped liquid discharge pipe 12 and is connected to a push rod 42.

In the present embodiment, when the electric opening device 40 is operated, the actuating end of the driving cylinder 41 drives the push rod 42 to move upward, and the push rod 42 pushes up the circular truncated cone shaped sealing block 231 to open the L-shaped drain pipe 12 for draining the accumulated water.

The specific process of the invention is as follows:

the model number of the PLC controller is 'IVC 2', the model number of the air pressure sensor 243 is 'BRW 800-2100', and the model number of the distance sensor 341 is 'LR 08BN04 DNOY'.

In a normal state, the L-shaped liquid discharge pipe 12 is in a sealed state, and the elastic extension component 24 can provide a downward thrust to the lifting pipe 22, so that the lifting pipe 22 drives the sealing component 23 to seal the L-shaped liquid discharge pipe 12;

when the elastic force extension part 24 works, the corrugated outer sleeve 241 is in an extension state due to the fact that the internal air pressure of the corrugated outer sleeve 241 is large, and therefore the lifting pipe 22 is pushed downwards;

the PLC controller receives the pressure data from the pressure sensor 243 and opens the valve of the gas tank 242 to allow the gas flow to enter the corrugated outer sleeve 241 until the pressure data is consistent with the set value, so as to give a stable downward thrust to the elevator tube 22;

when the sealing component 23 works, the circular truncated cone-shaped sealing block 231 and the sealing inclined surface 232 are matched to form a good sealing effect, so that steam is effectively prevented from leaking through the L-shaped liquid discharge pipe 12, and the circular truncated cone-shaped sealing block 231 and the sealing inclined surface 232 are matched to limit the downward stroke of the lifting pipe 22;

the anti-rotation boss 221 is matched with the anti-rotation groove 211 to prevent the relative rotation between the elevator tube 22 and the positioning tube 21, so that the elevator tube 22 can be kept to be stably lifted;

when steam enters the valve body shell 10, the steam gives pressure to the annular floating plate 321 to enable the airlock cover pipe 322 to seal the filtering water inlet component 31, after condensed water is accumulated in the valve body shell 10, the condensed water drives the annular floating plate 321 and the airlock cover pipe 322 to move upwards, the condensed water enters the lifting pipe 22 after being filtered by the filtering water inlet component 31 and drives the buoyancy component 33 to move upwards through buoyancy, the PLC receives distance data measured by the distance sensor 341 and the distance measuring plate 336, and triggers the electric opening device 40 when the distance data is smaller than a set value, so that the electric opening device 40 pushes the sealing component 23 upwards, and when the distance data is larger than or equal to the set value, the electric opening device 40 is in a closed state;

the condensed water filtered by the filter ring 312 enters the lifting pipe 22 through the water inlet through hole 311;

the condensed water drives the plunger plate 334, the connecting rod 335 and the ranging plate 336 to move upwards through buoyancy, air at the upper part of the plunger plate 334 is discharged out of the valve body shell 10 through the air pipe 337, and the leaking plate 332 and the annular air bag 333 are supported by the condensed water through buoyancy, so that the ranging plate 336 can be moved upwards quickly;

the limit sleeve 342 can protect the distance sensor 341;

when the electric opening device 40 works, the actuating end of the driving cylinder 41 drives the push rod 42 to move upwards, and the push rod 42 pushes the truncated cone-shaped sealing block 231 upwards to open the L-shaped liquid discharge pipe 12 so as to discharge accumulated water.

The invention is described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the above-described embodiments, and it is within the scope of the invention to adopt such insubstantial modifications of the inventive method concept and solution, or to apply the inventive concept and solution directly to other applications without modification.

Claims (10)

1. The electric valve for steam turbine main steam drainage comprises a valve body shell (10), a liquid inlet pipe (11) communicated with the side wall of the valve body shell (10), and an L-shaped liquid discharge pipe (12) communicated with the bottom of the valve body shell (10), and is characterized in that a liquid discharge opening and closing device (20) is arranged in the valve body shell (10), the liquid discharge opening and closing device (20) comprises a positioning pipe (21) with the top connected with the top of the inner wall of the valve body shell (10), a lifting pipe (22) connected with the inner wall of the positioning pipe (21) in a sliding manner and with the bottom extending to the lower part of the positioning pipe (21), a sealing component (23) arranged at the bottom of the lifting pipe (22) and used for sealing the L-shaped liquid discharge pipe (12), and an elastic extension component (24) with the top end and the bottom respectively sleeved on the side wall of the positioning pipe (21) and the side wall of the lifting pipe (22);

a water level detection device (30) is arranged in the lifting pipe (22), the water level detection device (30) comprises a filtering water inlet component (31) which is arranged on the side wall of the lifting pipe (22) and is positioned between the elastic extension component (24) and the sealing component (23), a lifting airlock component (32) which is arranged on the side wall of the lifting pipe (22) and covers the outside of the filtering water inlet component (31), a buoyancy component (33) which is arranged on the inner wall of the lifting pipe (22) and the top end of which extends into the positioning pipe (21), and a distance measurement component (34) which is arranged on the top of the inner wall of the positioning pipe (21);

an electric opening device (40) with an execution end extending into the L-shaped liquid discharge pipe (12) is arranged at the bottom of the L-shaped liquid discharge pipe (12), and the electric opening device (40) is used for moving the sealing component (23) upwards when the distance value of the distance measuring component (34) to the buoyancy component (33) is smaller than a set value.

2. The electric valve for steam turbine main steam trap as claimed in claim 1, wherein the elevating pipe (22) has a plurality of anti-rotation bosses (221) in a circular array on a side wall thereof, and the positioning pipe (21) has an anti-rotation groove (211) on an inner wall thereof for engaging with the anti-rotation bosses (221).

3. The electric valve for steam turbine main steam trap of claim 1, wherein the sealing member (23) comprises a frustoconical sealing block (231) disposed at the bottom of the elevator pipe (22), and a sealing inclined surface (232) disposed on the inner wall of the L-shaped drain pipe (12) and engaged with the frustoconical sealing block (231).

4. The steam turbine main steam trap electric valve according to claim 1, wherein the elastic force extension part (24) comprises a corrugated outer sleeve (241) with a top end and a bottom end respectively sleeved on the side wall of the positioning pipe (21) and the side wall of the lifting pipe (22), and a gas tank (242) arranged at the top of the valve body housing (10), and the gas tank (242) is communicated with the corrugated outer sleeve (241) through a pipeline.

5. The steam turbine main steam trap electric valve according to claim 4, characterized in that the inner wall of the corrugated outer sleeve (241) is provided with an air pressure sensor (243), and the PLC controller receives pressure data of the air pressure sensor (243) and opens a valve of the air tank (242) to enable air flow to enter the corrugated outer sleeve (241) until the pressure data is consistent with a set value.

6. The steam turbine main steam trap electric valve according to claim 1, wherein the filtering water inlet unit (31) includes a plurality of water inlet holes (311) penetrating through the side wall of the lifting pipe (22), and a filtering ring (312) disposed on the outer wall of the lifting pipe (22) and sleeved outside the water inlet holes (311).

7. The electric valve for steam turbine main steam trap of claim 1, wherein the lift airlock part (32) comprises an annular floating plate (321) sleeved on the outer wall of the lift pipe (22), and an airlock cover pipe (322) arranged at the bottom of the annular floating plate (321) and covering the outside of the filter water inlet part (31).

8. The electric valve for steam turbine main steam drainage according to claim 1, wherein the buoyancy member (33) comprises a limit boss (331) disposed on an inner wall of the lifting pipe (22) and located at an upper portion of the filtering water inlet member (31), a bushing (332) contacting with the limit boss (331) at a bottom portion, an annular air bag (333) disposed on the bushing (332), a plunger plate (334) disposed on the annular air bag (333), a connecting rod (335) disposed on a top portion of the plunger plate (334) and extending into the positioning pipe (21), and a distance measuring plate (336) disposed on a top end of the connecting rod (335), wherein the top portion of the lifting pipe (22) is communicated with a bottom end of an air pipe (337), and a top end of the air pipe (337) is communicated with a top portion of an inner wall of the valve body housing (10).

9. The steam turbine main steam trap electric valve according to claim 1, wherein the distance measuring part (34) comprises a distance sensor (341) arranged on the top of the inner wall of the positioning pipe (21), and a limit sleeve (342) arranged on the top of the inner wall of the positioning pipe (21) and sleeved outside the distance sensor (341), and the length of the limit sleeve (342) is greater than that of the distance sensor (341).

10. The electric valve for steam turbine main steam trap as claimed in claim 1, characterized in that the electric opening device (40) comprises a driving cylinder (41) arranged at the bottom of the L-shaped drain pipe (12), and the execution end of the driving cylinder (41) penetrates through the bottom of the L-shaped drain pipe (12) to be connected with a push rod (42).

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