CN110513489B - Steam turbine and quick-closing valve system thereof - Google Patents

Steam turbine and quick-closing valve system thereof Download PDF

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Publication number
CN110513489B
CN110513489B CN201910899665.3A CN201910899665A CN110513489B CN 110513489 B CN110513489 B CN 110513489B CN 201910899665 A CN201910899665 A CN 201910899665A CN 110513489 B CN110513489 B CN 110513489B
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China
Prior art keywords
valve
disc
seat
valve rod
valve disc
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Active
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CN201910899665.3A
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Chinese (zh)
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CN110513489A (en
Inventor
王领
何雄飞
边荣柄
倪成良
严懿翔
步汉明
沈国杭
李鑫
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Zhejiang Huayuan Steam Turbine Machinery Co ltd
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Zhejiang Huayuan Steam Turbine Machinery Co ltd
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Priority to CN201910899665.3A priority Critical patent/CN110513489B/en
Publication of CN110513489A publication Critical patent/CN110513489A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
    • B01D35/04—Plug, tap, or cock filters filtering elements mounted in or on a faucet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Lift Valve (AREA)

Abstract

The invention provides a steam turbine and a quick-closing valve system thereof, wherein the system comprises a valve body and a hydraulic driving mechanism thereof; the valve body comprises a shell, a valve seat, a valve core and a valve rod, wherein the shell comprises a steam inlet and a steam outlet, the valve seat is arranged at the steam outlet and is communicated with the steam outlet, the valve core is arranged in the shell and is opposite to the valve seat, one end of the valve rod is connected with the valve core, and the other end of the valve rod penetrates through the shell and is connected with the driving end of the hydraulic driving mechanism; the valve core comprises a valve disc with a hollow columnar structure, one end of the valve disc, which is opposite to the valve seat, is provided with an end face, and the other end of the valve disc is open; the valve disc is sleeved with a sleeve, and one end, away from the end face of the valve disc, of the sleeve is fixed on the shell. The quick-closing valve body part adopts a hollow valve core structure, so that the coordination of the distribution of the gravity of the quick-closing valve is improved, and the opening force of the valve disc and the valve seat when separated is smaller, thereby being beneficial to reducing the size of the valve rod driving mechanism.

Description

Steam turbine and quick-closing valve system thereof
Technical Field
The invention relates to a valve, in particular to a quick-closing valve system and a steam turbine using the quick-closing valve system.
Background
The quick-closing valve is widely applied to high-speed rotating turbine machinery such as a steam turbine and is a main switching mechanism between a main steam pipeline and the steam turbine. The steam turbine is usually high-parameter steam, and the high flow rate of the high-parameter steam can impact the valve core, and the high-parameter steam is extremely easy to cause agitation when flowing through an irregular space inside the quick-closing valve, so that the stability of the valve body can be reduced, and the damage of the valve core can be accelerated. Therefore, in an emergency state, the steam inlet of the steam turbine needs to be cut off immediately, so that the unit is stopped rapidly, and the aim of protecting the unit is fulfilled; the quick-closing valve is used as a main switching mechanism for rapidly cutting off a high-parameter air source in emergency, and is an essential component in a security device.
The conventional valve core is of a solid structure, and the valve rod is of an elongated structure, so that the gravity at one end of the valve core of the quick-closing valve is obviously larger than that of the driving end, and the incompatibility of the gravity can aggravate excitation under the impact of high-pressure steam, so that the safety coefficient of the quick-closing valve is reduced.
Based on the above problems, chinese patent publication No. 202280482U discloses a quick-closing valve for a steam turbine, in which a part of steam leaks outwardly along a gap between a valve rod and a sleeve and a bushing during the opening process or after the quick-closing valve is closed, and gas is led out from the gap; when the quick-closing valve is fully opened, the main valve disc is tightly attached to the sealing surface of the sleeve, and the air leakage of the valve rod is blocked. The structure can reduce the opening force of the whole quick-closing valve to a certain extent, thereby reducing the size of a valve rod or a driving part and improving the safety in the opening process of the quick-closing valve, but the internal vibration excitation of the quick-closing valve caused by high-pressure steam impact cannot be solved, so that the vibration excitation problem cannot be fundamentally solved, and the quick-closing valve has larger potential safety hazard in the use process of the quick-closing valve.
Disclosure of Invention
In order to solve the above technical problems, a first object of the present invention is to provide a quick-closing valve system, in which a hollow valve core structure is adopted in a quick-closing valve body, so that the coordination of the distribution of the gravity of the quick-closing valve is improved, and the opening force of a valve disc when being separated from a valve seat is smaller, so that the size of a valve rod driving mechanism is reduced.
A second object of the present invention is to provide a steam turbine, the steam inlet of which is provided with the quick-closing valve described above.
In view of the above, one aspect of the present invention provides a quick-closing valve system including a quick-closing valve and a hydraulic drive mechanism thereof;
the quick-closing valve comprises a shell, a valve seat, a valve core and a valve rod, wherein the shell comprises a steam inlet and a steam outlet, the valve seat is arranged at the steam outlet and is communicated with the steam outlet, the valve core is arranged in the shell and is opposite to the valve seat, one end of the valve rod is connected with the valve core, and the other end of the valve rod penetrates through the shell and is connected with the hydraulic driving mechanism; when the valve rod moves along the axial direction of the valve rod, the valve core is driven to move together, so that the valve core is separated from the valve seat or matched with the valve seat in a pressing and blocking manner, and the communication or blocking between the steam inlet and the steam outlet is realized;
the valve core comprises a valve disc with a hollow columnar structure, the left end part of the valve disc is matched with the valve seat, and the valve disc is provided with an inner cavity;
the valve disc is provided with a first air hole for communicating the steam outlet and the cavity in the valve disc, the head of the valve rod is movably connected with the valve disc and can be in press-blocking fit with the first air hole, the valve rod is sleeved with a first spring, one end of the first spring is connected with the valve disc, the other end of the first spring is connected with the valve rod, the first spring endows the head of the valve rod with a trend of keeping away from the first air hole, and when the head of the valve rod is in press-blocking fit with the first air hole, the communication between the first air hole and the cavity in the valve disc can be blocked;
the valve disc is sleeved with a sleeve, one end of the sleeve, which is far away from the valve seat, is fixed on the inner wall of the shell, and when the valve disc moves along the axial direction of the sleeve, at least one part of the valve disc is always positioned in the sleeve;
the valve disc or the sleeve is provided with an airflow channel for communicating the steam inlet and the cavity in the valve disc;
the hydraulic driving mechanism comprises a hydraulic cylinder, a first valve, a second spring and an oil tank, wherein a piston is arranged in the hydraulic cylinder, the left side of the piston is connected with the valve rod, the right side of the piston is connected with the hydraulic cylinder through the second spring, a first oil way is arranged at the part of the hydraulic cylinder, which is positioned at the left side of the piston, a second oil way is arranged at the part, which is positioned at the right side of the piston, of the hydraulic cylinder, the first valve is arranged on the first oil way, and the second valve is arranged on the second oil way;
in the stop state, the first valve and the second valve are closed for pressure relief, the piston drives the valve rod to move left to the right under the action of the second spring, the valve disc is in press-plug fit with the valve seat, the head of the valve rod is in press-plug fit with the first air hole of the valve disc, and the steam inlet is not communicated with the steam outlet;
when the valve is started, the first valve is started first, starting oil enters the first oil way, then the second valve is started, quick-closing oil enters the second oil way and drives the piston to move right to compress the second spring, the piston drives the valve rod to move right, the valve disc is still in press-blocking fit with the valve seat under the action of the first spring, the pilot stroke is started, the head part of the valve rod leaves the first air hole of the valve disc, and small-flow steam is communicated to the steam outlet from the steam inlet through the air flow channel on the valve disc or the sleeve, the inner cavity of the valve disc, the first air hole and the valve seat, so that pilot unloading is realized; the piston and the valve rod continue to move rightwards, the valve rod drives the valve disc to move rightwards so that the valve disc is separated from the valve seat, and the steam inlet is directly communicated with the steam outlet.
When the direct communication channel between the steam inlet and the steam outlet is completely opened, the first valve is closed, and the first oil way is depressurized. Thus, when the system triggers a quick closing condition, the second oil way is depressurized, the valve rod moves left under the action of the second spring, the valve disc moves left under the drive of the valve rod, after the valve disc is matched with the valve seat in a pressing and blocking mode, the first spring is compressed, and the head of the valve rod is used for blocking the first air hole. The quick-closing valve is closed by adopting spring force, so that the impact is small, and the system is stable and reliable.
Preferably, the hydraulic pump further comprises an oil source, wherein the oil source is communicated with the first oil way through the first valve, and the oil source is communicated with the second oil way through the second valve.
Preferably, a throttle valve is arranged on a passage connecting the oil source with the first valve and the second valve.
Preferably, the hydraulic cylinder is also connected with an oil drain pipe.
Preferably, the valve disc is in threaded connection with a valve rod seat, a through hole for a valve rod to pass through is formed in the valve rod seat, the head of the valve rod is arranged in a clearance space between the valve disc and the valve rod seat, and the outer diameter of the head of the valve rod is larger than the aperture of the through hole; one end of the first spring is propped against the valve rod seat, and the other end of the first spring is propped against the valve rod. Like this, simple structure is reasonable, and the equipment is convenient, not only conveniently adjusts the effort of first spring, presses valve rod and valve dish together moreover, in quick-closing valve operation, guarantees that both can not produce vibration and rotation because of the impact of air current.
Preferably, a check ring is fixedly arranged on the valve rod seat, the first spring is arranged between the check ring and the valve rod seat, and the elastic coefficient of the first spring is smaller than that of the second spring.
Preferably, the outer wall of the valve disc is provided with a spiral groove, and the spiral groove and the sleeve are matched to form a spiral airflow channel which is communicated with the inner cavity of the valve disc; the valve rod seat is also provided with a plurality of second air holes which are communicated with the left side of the valve rod seat and the right side of the valve rod seat, so that when the head of the valve rod leaves the first air holes of the valve disc, the steam inlet is communicated with the first air holes through the air flow channel and the second air holes. Like this, simple structure is reasonable, and the effect is showing, sets up the helicla flute, not only can cushion steam flow and reduce the parameter of steam inlet steam, reduces the power of opening, can avoid the particulate matter to get into the steam outlet along with the air current in the in-process of leading unloading moreover.
Preferably, a filter screen is arranged at one end of the valve disc, which is close to the valve seat. The filter screen is matched with the spiral groove, and particles are prevented from entering the steam outlet along with the air flow in the process of leading unloading.
Preferably, the valve disc outer wall is further provided with an anti-rotation component, the inner wall of the sleeve is provided with a travel groove extending along the axial direction, the anti-rotation component is clamped in the travel groove and can slide along the axial direction in the travel groove along with the position change of the valve disc, so that the valve disc can only axially move relative to the sleeve and cannot circumferentially rotate relative to the sleeve.
In another aspect of the invention, a steam turbine is provided that includes the quick shut-off valve system.
Compared with the prior art, the invention has the beneficial effects that:
according to the quick-closing valve system, the quick-closing valve adopts the hollow valve core structure, so that the coordination of the distribution of the gravity of the quick-closing valve is improved, and the influence of excitation of high-pressure steam on the stability of the valve body is reduced;
the pilot unloading passage is added, so that the pressure difference between the steam inlet and the steam outlet is reduced, the opening force when the valve disc is separated from the valve seat is reduced, the size of the valve rod driving mechanism can be reduced, and the overall size of the quick-closing valve is further reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not limit the application.
FIG. 1 is a schematic diagram of a quick-shut valve system in an embodiment of the present invention in a shut-down condition;
FIG. 2 is a schematic diagram of a pilot-operated open state of a quick-shut valve system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the structure of the operation state of the quick-closing valve system in the embodiment of the invention.
100, quick closing valves; 200. a hydraulic drive mechanism;
11. a housing; 12. a valve disc; 13. a sleeve; 14. a valve stem; 15. a valve seat;
121. a valve rod seat; 122. a filter screen; 123. a first air hole; 124. an anti-rotation member;
141. a retainer ring; 142. a first spring; 143. a spring seat;
21. a hydraulic cylinder; 22. a first valve; 23. a second valve; 24. a throttle valve; 25. an oil source; 26. an oil drain pipe;
211. a piston; 212. and a second spring.
Detailed Description
The invention will be further described with reference to the drawings and examples.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. 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 application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Furthermore, in the description of the present invention, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The present embodiment provides a valve core of a quick-closing valve, as shown in fig. 1 to 3, the valve core includes:
a valve disc 12, the valve disc 12 having an inner cavity penetrating the right end of the valve disc 12, the left end of the valve disc 12 being provided with a first air hole 123 for communicating the outside of the valve disc 12 with the inner cavity;
the valve rod 14 is inserted into the inner cavity of the valve disc 12 from the right side of the valve disc 12, the head of the valve rod 14 is movably connected with the valve disc 12 and can be in press-blocking fit with the first air hole 123, a first spring 142 is sleeved on the valve rod 14, one end of the first spring 142 is connected with the valve disc 12, the other end of the first spring 142 is connected with the valve rod 14, the first spring 142 gives the head of the valve rod 14 a trend of being far away from the first air hole 123, and when the head of the valve rod 14 is in press-blocking fit with the first air hole 123, the communication between the first air hole 123 and the inner cavity of the valve disc 12 can be blocked;
a sleeve 13 sleeved outside the valve disc 12, wherein the right end of the sleeve 13 is used for being fixed on the shell 11 of the quick-closing valve 100, the valve disc 12 extends out of the left end of the sleeve 13 and can move leftwards and rightwards along the axial direction of the sleeve 13, and when the valve disc 12 moves along the axial direction of the sleeve 13, at least one part of the valve disc 12 is always positioned in the sleeve 13;
wherein, the outer peripheral wall of the valve disc 12 is provided with an air flow channel for communicating the outer cavity and the inner cavity of the valve disc 12, or the outer peripheral wall of the sleeve 13 is provided with an air flow channel for communicating the outer cavity and the inner cavity of the valve disc 12, or the matching part of the valve disc 12 and the sleeve 13 is provided with an air flow channel for communicating the outer cavity and the inner cavity of the valve disc 12.
As a preferred embodiment, the valve disc 12 is screwed with a valve rod seat 121, a through hole for the valve rod 14 to pass through is arranged on the valve rod seat 121, the head of the valve rod 14 is arranged in a clearance space between the valve disc 12 and the valve rod seat 121, and the outer diameter of the head of the valve rod 14 is larger than the aperture of the through hole; the length of the clearance space between the valve disc 12 and the valve rod seat 121 is the sum of the thickness of the head of the valve rod 14 and the length of the section s in fig. 1;
one end of the first spring 142 abuts against the valve stem seat 121, and the other end of the first spring 142 abuts against the valve stem 14. In this way, the structure is simple and reasonable, the assembly is convenient, the acting force of the first spring 142 is convenient to adjust, the valve rod 14 and the valve disc 12 are pressed together, and vibration and rotation caused by the impact of air flow can be avoided in the operation of the quick-closing valve 100.
During the left-right movement of the valve stem 14, a part of the stroke (see section s in fig. 1) of the valve stem 14 can move relative to the valve disc 12, especially when the valve stem 14 starts to move rightwards from the leftmost position, the valve stem 14 moves rightwards to separate from the first air hole 123, the first air hole 123 is communicated with the inside of the valve disc 12 to form a pilot unloading passage, and steam in the valve disc 12 can be discharged from the pilot unloading passage, so that high-pressure steam can be pilot unloaded through the pilot unloading passage before the valve disc 12 is separated from the valve seat 15, and the resistance when the valve disc 12 is separated from the valve seat 15 is reduced, so that the size of a driving mechanism (such as a hydraulic cylinder 21) can be reduced, and the size of the whole quick-closing valve system is reduced; i.e. the existence of the idle stroke S, ensures that when the valve disc 12 is opened, the opening force is reduced due to the effect of pilot unloading by communicating the steam flow channels, thereby reducing the size of the actuating cylinder. Another part of the stroke during the left-right movement of the valve rod 14 can drive the valve disc 12 to move together, so that the valve disc 12 and the valve seat 15 are separated or buckled.
As a preferred embodiment, a retainer ring 141 is fixedly disposed on the valve stem seat 121, and the first spring 142 is disposed between the retainer ring 141 and the valve stem seat 121.
As a preferred embodiment, a spring seat 143 is further disposed between the first spring 142 and the retainer ring 141, and the spring seat 143 is sleeved on the valve stem 14.
As a preferred embodiment, the outer wall of the valve disc 12 is provided with a helical groove which cooperates with the sleeve 13 to form a helical air flow channel. The impact force on the butterfly valve can be reduced in the process of the airflow flowing along the spiral airflow channel, and the possibility of excitation is reduced; at the same time, the spiral groove design reduces the parameters of the steam from the steam inlet, reducing the opening or closing force of the drive mechanism to the valve disc 12.
As a preferred embodiment, the valve stem seat 121 is further provided with a plurality of second air holes, which communicate with the left side of the valve stem seat 121 with the right side of the valve stem seat 121, so that the spiral air flow channel communicates with the first air holes 123 when the valve stem 14 moves relative to the valve disc 12; preferably, the valve rod seat 121 may also have a hollow structure, so long as it can ensure that the air flows on the left and right sides of the valve rod seat 121 in the valve disc 12 are communicated.
As a preferred embodiment, the end of the valve disc 12 near the valve seat 15 is provided with a filter screen 122, so as to avoid that in the pilot-opened state shown in fig. 2, particulate matter enters the steam outlet along with steam, and thus larger particulate matter enters the turbine through-flow part along with high-speed steam impact, and damage is caused to blades of the through-flow part and the valve regulating sealing surface.
As a preferred embodiment, the screen 122 is secured to the valve disc 12 by rolling.
As a preferred embodiment, the outer peripheral wall of the valve disc 12 is fixedly provided with an anti-rotation component 124, the inner wall of the sleeve 13 is provided with a travel groove extending along the axial direction, the anti-rotation component 124 is clamped in the travel groove, and can slide along the axial direction in the travel groove along with the position change of the valve disc 12, so that the valve disc 12 can only move axially relative to the sleeve 13 but not rotate circumferentially relative to the sleeve 13. In this way, it is ensured that the valve disc 12 does not rotate continuously due to the impact of steam, which is advantageous for reducing wear and increasing safety.
Based on the above valve core structure, this embodiment further provides a quick-closing valve 100, as shown in fig. 1-3, including a housing 11, a valve seat 15, a valve core and a valve rod 14, where the housing 11 includes a steam inlet and a steam outlet, the valve seat 15 is disposed at the steam outlet and is communicated with the steam outlet, the valve core is disposed in the housing 11 and is opposite to the valve seat 15, one end of the valve rod 14 is connected with the valve core, and the other end of the valve rod penetrates through the housing 11 and is connected with the hydraulic driving mechanism 200; when the valve rod 14 moves along the axial direction, the valve core is driven to move together, so that the valve core is separated from the valve seat 15 or matched with the valve seat 15 in a press-blocking manner, and the communication or blocking between the steam inlet and the steam outlet is realized;
the valve core comprises a valve disc 12 with a hollow columnar structure, the left end part of the valve disc 12 is matched with a valve seat 15, and the valve disc 12 is provided with an inner cavity;
the valve disc 12 is provided with a first air hole 123 for communicating a steam outlet and a cavity in the valve disc 12, the head of the valve rod 14 is movably connected with the valve disc 12 and can be in press-blocking fit with the first air hole 123, the valve rod 14 is sleeved with a first spring 142, one end of the first spring 142 is connected with the valve disc 12, the other end of the first spring 142 is connected with the valve rod 14, the first spring 142 gives the head of the valve rod 14 a trend of being far away from the first air hole 123, and when the head of the valve rod 14 is in press-blocking fit with the first air hole 123, the communication between the first air hole 123 and the cavity in the valve disc 12 can be blocked;
the valve disc 12 is sleeved with a sleeve 13, one end of the sleeve 13 far away from the valve seat 15 is fixed on the inner wall of the shell 11, and when the valve disc 12 moves along the axial direction of the sleeve 13, at least one part of the valve disc 12 is always positioned in the sleeve 13;
the valve disc 12 or the sleeve 13 is provided with an air flow channel for communicating the steam inlet with the cavity inside the valve disc 12.
As a preferred embodiment, the valve disc 12 is screwed with a valve rod seat 121, a through hole for the valve rod 14 to pass through is arranged on the valve rod seat 121, the head of the valve rod 14 is arranged in a clearance space between the valve disc 12 and the valve rod seat 121, and the outer diameter of the head of the valve rod 14 is larger than the aperture of the through hole; one end of the first spring 142 abuts against the valve stem seat 121, and the other end of the first spring 142 abuts against the valve stem 14. Like this, simple structure is reasonable, and the equipment is convenient, not only conveniently adjusts the effort of first spring 142, presses valve rod 14 and valve dish 12 together in addition, in quick-closing valve 100 operation, guarantees that both can not produce vibration and rotation because of the impact of air current, namely: when the force for driving the valve rod 14 to move leftwards overcomes the elastic force of the first spring 142, the valve rod 14 can be driven to move leftwards, so that the connection between the valve disc 12 and the valve rod 14 has pretightening pressure, and the vibration of the valve disc 12 and the valve rod 14 is reduced or avoided, thereby avoiding the influence of the excitation of high-pressure steam on the tightness of the connection part of the valve disc 12 and the valve seat 15.
As a preferred embodiment, a retainer ring 141 is fixedly disposed on the valve stem seat 121, and the first spring 142 is disposed between the retainer ring 141 and the valve stem seat 121.
As a preferred embodiment, a spring seat 143 is further disposed between the first spring 142 and the retainer ring 141, and the spring seat 143 is sleeved on the valve stem 14.
As a preferred embodiment, the outer wall of the valve disc 12 is provided with a helical groove which cooperates with the sleeve 13 to form a helical air flow channel which communicates with the internal cavity of the valve disc 12; the valve rod seat 121 is further provided with a plurality of second air holes, and the second air holes are communicated with the left side of the valve rod seat 121 and the right side of the valve rod seat 121, so that when the head of the valve rod 14 leaves the first air holes 123 of the valve disc 12, the steam inlet is communicated with the first air holes 123 through the air flow channel and the second air holes. Like this, simple structure is reasonable, and the effect is showing, sets up the helicla flute, not only can cushion steam flow and reduce the parameter of steam inlet steam, reduces the power of opening, can avoid the particulate matter to get into the steam outlet along with the air current in the in-process of leading unloading moreover. Preferably, the valve rod seat 121 may also have a hollow structure, so long as it can ensure that the air flows on the left and right sides of the valve rod seat 121 in the valve disc 12 are communicated.
As a preferred embodiment, the valve disc 12 is provided with a sieve 122 at its end close to the valve seat 15. The filter 122 cooperates with the spiral groove to prevent particulate matter from entering the steam outlet with the air flow during the pilot unloading process.
As a preferred embodiment, the outer wall of the valve disc 12 is further provided with an anti-rotation component 124, the inner wall of the sleeve 13 is provided with a travel groove extending along the axial direction, the anti-rotation component 124 is clamped in the travel groove, and can slide along the axial direction in the travel groove along with the position change of the valve disc 12, so that the valve disc 12 can only move axially relative to the sleeve 13 but cannot rotate circumferentially relative to the sleeve 13.
Based on the structure of the quick-closing valve 100 described above, the present embodiment also provides a quick-closing valve system including the quick-closing valve 100 and its hydraulic drive mechanism 200;
the quick-closing valve 100 comprises a shell 11, a valve seat 15, a valve core and a valve rod 14, wherein the shell 11 comprises a steam inlet and a steam outlet, the valve seat 15 is arranged at the steam outlet and is communicated with the steam outlet, the valve core is arranged in the shell 11 and is opposite to the valve seat 15, one end of the valve rod 14 is connected with the valve core, and the other end of the valve rod penetrates through the shell 11 and is connected with the hydraulic driving mechanism 200; when the valve rod 14 moves along the axial direction, the valve core is driven to move together, so that the valve core is separated from the valve seat 15 or matched with the valve seat 15 in a press-blocking manner, and the communication or blocking between the steam inlet and the steam outlet is realized;
the valve core comprises a valve disc 12 with a hollow columnar structure, the left end part of the valve disc 12 is matched with a valve seat 15, and the valve disc 12 is provided with an inner cavity;
the valve disc 12 is provided with a first air hole 123 for communicating a steam outlet and a cavity in the valve disc 12, the head of the valve rod 14 is movably connected with the valve disc 12 and can be in press-blocking fit with the first air hole 123, the valve rod 14 is sleeved with a first spring 142, one end of the first spring 142 is connected with the valve disc 12, the other end of the first spring 142 is connected with the valve rod 14, the first spring 142 gives the head of the valve rod 14 a trend of being far away from the first air hole 123, and when the head of the valve rod 14 is in press-blocking fit with the first air hole 123, the communication between the first air hole 123 and the cavity in the valve disc 12 can be blocked;
the valve disc 12 is sleeved with a sleeve 13, one end of the sleeve 13 far away from the valve seat 15 is fixed on the inner wall of the shell 11, and when the valve disc 12 moves along the axial direction of the sleeve 13, at least one part of the valve disc 12 is always positioned in the sleeve 13;
the valve disc 12 or the sleeve 13 is provided with an airflow channel for communicating the steam inlet and the cavity inside the valve disc 12;
the hydraulic driving mechanism 200 comprises a hydraulic cylinder 21, a first valve 22, a second valve 23, a second spring 212 and an oil tank, wherein a piston 211 is arranged in the hydraulic cylinder 21, the left side of the piston 211 is connected with the valve rod 14, the right side of the piston 211 is connected with the hydraulic cylinder 21 through the second spring 212, a first oil path is arranged at the part of the hydraulic cylinder 21 positioned at the left side of the piston 211, a second oil path is arranged at the part positioned at the right side of the piston 211, the first valve 22 is arranged on the first oil path, and the second valve 23 is arranged on the second oil path;
in the stopping state, the first valve 22 and the second valve 23 are closed for pressure relief, the piston 211 drives the valve rod 14 to move left to the right under the action of the second spring 212, the valve disc 12 is in press-blocking fit with the valve seat 15, the head of the valve rod 14 is in press-blocking fit with the first air hole 123 of the valve disc 12, and the steam inlet is not communicated with the steam outlet;
when the valve is started, the first valve 22 is firstly opened, starting oil enters the first oil way, then the second valve 23 is opened, quick-closing oil enters the second oil way and drives the piston 211 to move right to compress the second spring 212, the piston 211 drives the valve rod 14 to move right, the valve disc 12 is still in press-blocking fit with the valve seat 15 under the action of the first spring 142, the pilot stroke is opened, the head of the valve rod 14 leaves the first air hole 123 of the valve disc 12, and small-flow steam is communicated to the steam outlet from the steam inlet through the air flow channel on the valve disc 12 or the sleeve 13, the inner cavity of the valve disc 12, the first air hole 123 and the valve seat 15 so as to realize pilot unloading; the piston 211 and the valve rod 14 continue to move rightwards, the valve rod 14 drives the valve disc 12 to move rightwards so that the valve disc 12 is separated from the valve seat 15, and the steam inlet is directly communicated with the steam outlet.
When the direct communication channel between the steam inlet and the steam outlet is completely opened, the first valve 22 is closed, and the first oil path is depressurized. Thus, when the system triggers the quick closing condition, the second oil way is depressurized, the valve rod 14 moves leftwards under the action of the second spring 212, the valve disc 12 moves leftwards under the drive of the valve rod 14, and after the valve disc 12 is in press-blocking fit with the valve seat 15, the first spring 142 is compressed, and the head of the valve rod 14 seals the first air hole 123. The quick-closing valve is closed by adopting spring force, so that the impact is small, and the system is stable and reliable.
As a preferred embodiment, the oil supply device further comprises an oil source 25, wherein the oil source 25 is communicated with the first oil circuit through the first valve 22, and the oil source 25 is communicated with the second oil circuit through the second valve 23.
As a preferred embodiment, a throttle 24 is provided in the passage connecting the oil source 25 with the first and second valves 22 and 23.
As a preferred embodiment, an oil drain pipe 26 is also connected to the hydraulic cylinder 21.
As a preferred embodiment, the valve disc 12 is screwed with a valve rod seat 121, a through hole for the valve rod 14 to pass through is arranged on the valve rod seat 121, the head of the valve rod 14 is arranged in a clearance space between the valve disc 12 and the valve rod seat 121, and the outer diameter of the head of the valve rod 14 is larger than the aperture of the through hole; one end of the first spring 142 abuts against the valve stem seat 121, and the other end of the first spring 142 abuts against the valve stem 14. In this way, the structure is simple and reasonable, the assembly is convenient, the acting force of the first spring 142 is convenient to adjust, the valve rod 14 and the valve disc 12 are pressed together, and vibration and rotation caused by the impact of air flow can be avoided in the operation of the quick-closing valve 100.
As a preferred embodiment, a retainer ring 141 is fixedly disposed on the valve stem seat 121, and the first spring 142 is disposed between the retainer ring 141 and the valve stem seat 121, and the elastic coefficient of the first spring 142 is smaller than that of the second spring 212.
As a preferred embodiment, the outer wall of the valve disc 12 is provided with a helical groove which cooperates with the sleeve 13 to form an air flow channel which communicates with the internal cavity of the valve disc 12; the valve rod seat 121 is further provided with a plurality of second air holes, and the second air holes are communicated with the left side of the valve rod seat 121 and the right side of the valve rod seat 121, so that when the head of the valve rod 14 leaves the first air holes 123 of the valve disc 12, the steam inlet is communicated with the first air holes 123 through the air flow channel and the second air holes. Like this, simple structure is reasonable, and the effect is showing, sets up the helicla flute, not only can cushion steam flow and reduce the parameter of steam inlet steam, reduces the power of opening, can avoid the particulate matter to get into the steam outlet along with the air current in the in-process of leading unloading moreover.
As a preferred embodiment, the valve disc 12 is provided with a sieve 122 at its end close to the valve seat 15. The filter 122 cooperates with the spiral groove to prevent particulate matter from entering the steam outlet with the air flow during the pilot unloading process.
As a preferred embodiment, the outer wall of the valve disc 12 is further provided with an anti-rotation component 124, the inner wall of the sleeve 13 is provided with a travel groove extending along the axial direction, the anti-rotation component 124 is clamped in the travel groove, and can slide along the axial direction in the travel groove along with the position change of the valve disc 12, so that the valve disc 12 can only move axially relative to the sleeve 13 but cannot rotate circumferentially relative to the sleeve 13.
In conclusion, the valve core structure is hollow, so that the coordination of the distribution of the gravity of the quick-closing valve is improved, and the influence of the excitation of high-pressure steam on the stability of the valve body is reduced; the pilot unloading passage is added, so that the pressure difference between the steam inlet and the steam outlet is reduced, the opening force when the valve disc is separated from the valve seat is reduced, the size of the valve rod driving mechanism can be reduced, and the overall size of the quick-closing valve is further reduced.
In addition, it should be noted that:
in the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by those skilled in the art without departing from the spirit and principles of the invention, and any simple modification, equivalent variation and modification of the above embodiments in light of the technical principles of the invention may be made within the scope of the present invention.

Claims (7)

1. A quick-closing valve system comprises a quick-closing valve (100) and a hydraulic driving mechanism (200) thereof;
the quick-closing valve (100) comprises a shell (11), a valve seat (15), a valve core and a valve rod (14), wherein the shell (11) comprises a steam inlet and a steam outlet, the valve seat (15) is arranged at the steam outlet and is communicated with the steam outlet, the valve core is arranged in the shell (11) and is opposite to the valve seat (15), one end of the valve rod (14) is connected with the valve core, and the other end of the valve rod penetrates through the shell (11) and is connected with the hydraulic driving mechanism (200); when the valve rod (14) moves along the axial direction, the valve core is driven to move together, so that the valve core is separated from the valve seat (15) or matched with the valve seat in a pressing and blocking way, and the communication or blocking between the steam inlet and the steam outlet is realized; it is characterized in that the method comprises the steps of,
the valve core comprises a valve disc (12) with a hollow columnar structure, the left end part of the valve disc (12) is matched with a valve seat (15), and the valve disc (12) is provided with an inner cavity;
the valve disc (12) is provided with a first air hole (123) used for communicating a steam outlet and an internal cavity of the valve disc (12), the head of the valve rod (14) is movably connected with the valve disc (12) and can be in press-blocking fit with the first air hole (123), the valve rod (14) is sleeved with a first spring (142), one end of the first spring (142) is connected with the valve disc (12), the other end of the first spring (142) is connected with the valve rod (14), the first spring (142) endows the head of the valve rod (14) with a trend of being far away from the first air hole (123), and when the head of the valve rod (14) is in press-blocking fit with the first air hole (123), the communication between the first air hole (123) and the internal cavity of the valve disc (12) can be blocked;
the valve disc (12) is sleeved with a sleeve (13), one end of the sleeve (13) far away from the valve seat (15) is fixed on the inner wall of the shell (11), and when the valve disc (12) moves along the axial direction of the sleeve (13), at least one part of the valve disc (12) is always positioned in the sleeve (13);
the valve disc (12) or the sleeve (13) is provided with an airflow channel for communicating the steam inlet and the cavity inside the valve disc (12);
the hydraulic driving mechanism (200) comprises a hydraulic cylinder (21), a first valve (22), a second valve (23), a second spring (212) and an oil tank, wherein a piston (211) is arranged in the hydraulic cylinder (21), the left side of the piston (211) is connected with the valve rod (14), the right side of the piston (211) is connected with the hydraulic cylinder (21) through the second spring (212), a first oil way is arranged at the part of the hydraulic cylinder (21) which is positioned at the left side of the piston (211), a second oil way is arranged at the part which is positioned at the right side of the piston (211), the first valve (22) is arranged on the first oil way, and the second valve (23) is arranged on the second oil way;
in the stop state, the first valve (22) and the second valve (23) are closed for pressure relief, the piston (211) drives the valve rod (14) to move left to the right under the action of the second spring (212), the valve disc (12) is in press-blocking fit with the valve seat (15), the head of the valve rod (14) is in press-blocking fit with the first air hole (123) of the valve disc (12), and the steam inlet is not communicated with the steam outlet;
when the valve is started, the first valve (22) is firstly opened, starting oil enters the first oil way, then the second valve (23) is opened, quick-closing oil enters the second oil way and drives the piston (211) to move rightwards to compress the second spring (212), the piston (211) drives the valve rod (14) to move rightwards, the valve disc (12) is still in press-fit with the valve seat (15) under the action of the first spring (142), the pilot stroke is opened, the head of the valve rod (14) leaves the first air hole (123) of the valve disc (12), and small-flow steam is communicated to the steam outlet from the steam inlet through the air flow channel on the valve disc (12) or the sleeve (13), the inner cavity of the valve disc (12), the first air hole (123) and the valve seat (15) so as to realize pilot unloading; the piston (211) and the valve rod (14) continue to move rightwards, the valve rod (14) drives the valve disc (12) to move rightwards so that the valve disc (12) is separated from the valve seat (15), and the steam inlet is directly communicated with the steam outlet;
the oil supply device further comprises an oil source (25), wherein the oil source (25) is communicated with the first oil way through the first valve (22), and the oil source (25) is communicated with a second oil way through a second valve (23);
a throttle valve (24) is arranged on a passage of the oil source (25) connected with the first valve (22) and the second valve (23);
and the hydraulic cylinder (21) is also connected with an oil drain pipe.
2. A quick closing valve system according to claim 1, characterized in that the valve disc (12) is screwed with a valve rod seat (121), the valve rod seat (121) is provided with a through hole for the valve rod (14) to pass through, the head of the valve rod (14) is arranged in the clearance space between the valve disc (12) and the valve rod seat (121), and the outer diameter of the head of the valve rod (14) is larger than the aperture of the through hole; one end of the first spring (142) is propped against the valve rod seat (121), and the other end of the first spring (142) is propped against the valve rod (14).
3. A quick-closing valve system according to claim 2, characterized in that a retainer ring (141) is fixedly arranged on the valve rod seat (121), the first spring (142) is arranged between the retainer ring (141) and the valve rod seat (121), and the elastic coefficient of the first spring (142) is smaller than that of the second spring (212).
4. A quick-shut-off valve system according to claim 2, characterized in that the valve disc (12) is provided with a spiral groove on its outer wall, which cooperates with the sleeve (13) to form a spiral air flow channel, which communicates with the inner cavity of the valve disc (12); the valve rod seat (121) is further provided with a plurality of second air holes, the second air holes are communicated with the left side of the valve rod seat (121) and the right side of the valve rod seat (121), so that when the head of the valve rod (14) leaves the first air holes (123) of the valve disc (12), the steam inlet is communicated with the first air holes (123) through the air flow channel and the second air holes.
5. A quick closing valve system according to claim 1, characterized in that the valve disc (12) is provided with a sieve (122) at its end close to the valve seat (15).
6. A quick-closing valve system according to claim 1, characterized in that the valve disc (12) is further provided with an anti-rotation member (124) on the outer wall, the inner wall of the sleeve (13) is provided with a travel groove extending along the axial direction, the anti-rotation member (124) is clamped in the travel groove, and can slide along the axial direction in the travel groove along with the position change of the valve disc (12), so that the valve disc (12) can only move along the axial direction relative to the sleeve (13) but not rotate along the circumferential direction relative to the sleeve (13).
7. A steam turbine comprising a quick shut-off valve system as set forth in any one of claims 1 to 6.
CN201910899665.3A 2019-09-23 2019-09-23 Steam turbine and quick-closing valve system thereof Active CN110513489B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6283390B1 (en) * 1997-11-28 2001-09-04 Robert Bosch Gmbh Fuel injection device for internal combustion engines
CN102486097A (en) * 2010-12-03 2012-06-06 北京全三维动力工程有限公司 High-pressure regulating valve and method for regulating high-pressure fluid
CN103925011A (en) * 2014-04-17 2014-07-16 哈尔滨汽轮机厂有限责任公司 9F-level double-pumping axial steam exhausting turbine
CN204827554U (en) * 2015-08-04 2015-12-02 北京全三维能源科技股份有限公司 Joint valve is adjusted to overcritical and main vapour of ultra supercritical steam turbine high pressure
CN106703902A (en) * 2015-08-04 2017-05-24 北京全三维能源科技股份有限公司 High-pressure valve casing assembly of supercritical and ultra-supercritical stream turbines
CN210531620U (en) * 2019-09-23 2020-05-15 浙江华元汽轮机械有限公司 Steam turbine and quick closing valve system thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6283390B1 (en) * 1997-11-28 2001-09-04 Robert Bosch Gmbh Fuel injection device for internal combustion engines
CN102486097A (en) * 2010-12-03 2012-06-06 北京全三维动力工程有限公司 High-pressure regulating valve and method for regulating high-pressure fluid
CN103925011A (en) * 2014-04-17 2014-07-16 哈尔滨汽轮机厂有限责任公司 9F-level double-pumping axial steam exhausting turbine
CN204827554U (en) * 2015-08-04 2015-12-02 北京全三维能源科技股份有限公司 Joint valve is adjusted to overcritical and main vapour of ultra supercritical steam turbine high pressure
CN106703902A (en) * 2015-08-04 2017-05-24 北京全三维能源科技股份有限公司 High-pressure valve casing assembly of supercritical and ultra-supercritical stream turbines
CN210531620U (en) * 2019-09-23 2020-05-15 浙江华元汽轮机械有限公司 Steam turbine and quick closing valve system thereof

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