CN110500417B - Quick-closing valve and valve core thereof - Google Patents

Quick-closing valve and valve core thereof Download PDF

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Publication number
CN110500417B
CN110500417B CN201910899654.5A CN201910899654A CN110500417B CN 110500417 B CN110500417 B CN 110500417B CN 201910899654 A CN201910899654 A CN 201910899654A CN 110500417 B CN110500417 B CN 110500417B
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CN
China
Prior art keywords
valve
valve disc
disc
valve rod
sleeve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201910899654.5A
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Chinese (zh)
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CN110500417A (en
Inventor
王领
李鑫
胡爱军
蒋建业
步汉明
何雄飞
边荣炳
徐生娟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Huayuan Steam Turbine Machinery Co ltd
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Zhejiang Huayuan Steam Turbine Machinery Co ltd
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Priority to CN201910899654.5A priority Critical patent/CN110500417B/en
Publication of CN110500417A publication Critical patent/CN110500417A/en
Application granted granted Critical
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Classifications

    • 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
    • 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
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—Valve members
    • 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
    • F16K1/32—Details
    • F16K1/48—Attaching valve members to screw-spindles
    • 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
    • F16K1/32—Details
    • F16K1/50—Preventing rotation of valve members
    • 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
    • F16K39/00—Devices for relieving the pressure on the sealing faces
    • F16K39/02—Devices for relieving the pressure on the sealing faces for lift valves
    • F16K39/024—Devices for relieving the pressure on the sealing faces for lift valves using an auxiliary valve on the main valve
    • 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
    • F16K47/00—Means in valves for absorbing fluid energy
    • F16K47/04—Means in valves for absorbing fluid energy for decreasing pressure or noise level, the throttle being incorporated in the closure member
    • F16K47/06—Means in valves for absorbing fluid energy for decreasing pressure or noise level, the throttle being incorporated in the closure member with a throttle in the form of a helical channel

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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 quick-closing valve and a valve core thereof, wherein the valve core comprises: the valve disc is of a hollow columnar structure, one end of the valve disc is provided with an end face, and the other end of the valve disc is open; the sleeve is sleeved outside the valve disc, and one end of the sleeve, which is far away from the end face of the valve disc, is used for being fixed on the shell of the quick-closing valve; the valve disc can move left and right along the axial direction of the sleeve, and when the valve disc moves along the axial direction of the sleeve, most of the axial direction of the valve disc is always in the sleeve. The valve adopts a hollow valve core structure, and improves the coordination of the distribution of the gravity of the quick-closing valve, thereby reducing the influence of the excitation of high-pressure steam on the stability of the valve body.

Description

Quick-closing valve and valve core thereof
Technical Field
The invention relates to a valve part, in particular to a valve core and a quick-closing valve using the same.
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 outward 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 technical problems, a first object of the present invention is to provide a valve core of a quick-closing valve, which adopts a hollow structure, so as to improve the coordination of the gravity distribution of the quick-closing valve and reduce the probability of excitation; and the pilot unloading passage is added, so that the opening force of the valve disc and the valve seat when being separated is reduced.
A second object of the present invention is to provide a quick-shut valve comprising the valve cartridge described above.
In view of the above object, according to one aspect of the present invention, there is provided a spool of a quick-closing valve, the spool including:
A valve disc, the valve disc is provided with an inner cavity, the inner cavity penetrates through the right end of the valve disc, and the left end of the valve disc is provided with a first air hole for communicating the outer part of the valve disc with the inner cavity;
The valve rod is inserted into the inner cavity of the valve disc from the right side of 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, a first spring is sleeved on the valve rod, 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 inner cavity of the valve disc can be blocked;
The valve disc extends out of the left end of the sleeve and can move left and right along the axial direction of the sleeve, 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 is characterized in that an air flow channel used for communicating the outer cavity and the inner cavity of the valve disc is arranged on the outer peripheral wall of the valve disc, or an air flow channel used for communicating the outer cavity and the inner cavity of the valve disc is arranged on the outer peripheral wall of the sleeve, or an air flow channel used for communicating the outer cavity and the inner cavity of the valve disc is arranged at the matching position of the valve disc and the sleeve.
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, and the first spring is arranged between the check ring and the valve rod seat.
Preferably, a spring seat is further arranged between the first spring and the retainer ring, and the spring seat is sleeved on the valve rod.
Preferably, the valve rod seat 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 and the right side of the valve rod seat.
Preferably, the valve disc outer wall is provided with a spiral groove which cooperates with the sleeve to form the air flow passage.
Preferably, a filter screen is arranged at one end of the valve disc, which is close to the valve seat.
Preferably, the filter screen is fixed to the valve disc by rolling.
Preferably, the valve disc is fixedly provided with an anti-rotation component on the outer peripheral wall, 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 quick-shut valve is provided that includes a valve spool as described above.
Compared with the prior art, the invention has the beneficial effects that:
1) The valve 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 influence of the excitation of high-pressure steam on the stability of the valve body is reduced;
2) 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 specification, illustrate embodiments of the application and together with the description serve to explain 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 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 exemplary embodiments according to 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 14a 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 (4)

1. A spool of a quick-closing valve, comprising:
A valve disc (12), the valve disc (12) having an internal 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 internal 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) 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 inner cavity of the valve disc (12) can be blocked;
the valve disc (12) extends out of the left end of the sleeve (13) and can move left and right 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);
The outer peripheral wall of the valve disc (12) is provided with an air flow channel for communicating the outer part 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 part 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 part and the inner cavity of the valve disc (12);
The valve disc (12) is in threaded connection with a valve rod seat (121), a through hole for the valve rod (14) to pass through is formed in 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) is propped against the valve rod seat (121), and the other end of the first spring (142) is propped against the valve rod (14);
A check ring (141) is fixedly arranged on the valve rod seat (121), and the first spring (142) is arranged between the check ring (141) and the valve rod seat (121);
A spring seat (143) is further arranged between the first spring (142) and the retainer ring (141), and the spring seat (143) is sleeved on the valve rod (14);
The valve rod seat (121) is also provided with a plurality of second air holes which are communicated with the left side of the valve rod seat (121) and the right side of the valve rod seat (121);
The outer wall of the valve disc (12) is provided with a spiral groove which is matched with the sleeve (13) to form the airflow channel;
The valve disc (12) is fixedly provided with an anti-rotation component (124) on the peripheral wall, a travel groove extending along the axial direction is formed in the inner wall of the sleeve (13), 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 axially move relative to the sleeve (13) but cannot circumferentially rotate relative to the sleeve (13).
2. Valve core of a quick closing valve 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).
3. Valve core of a quick closing valve according to claim 2, characterized in that the filter screen (122) is fixed by rolling in connection with the valve disc (12).
4. A quick-closing valve comprising a spool according to any one of claims 1-3.
CN201910899654.5A 2019-09-23 2019-09-23 Quick-closing valve and valve core thereof Active CN110500417B (en)

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CN201910899654.5A CN110500417B (en) 2019-09-23 2019-09-23 Quick-closing valve and valve core thereof

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CN110500417B true CN110500417B (en) 2024-05-17

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4176687A (en) * 1977-08-25 1979-12-04 Cla-Val Co. Hollow spool valve
EP0030083A2 (en) * 1979-10-31 1981-06-10 Fluid Controls, Inc. Solenoid operated relief valve
CN101520095A (en) * 2009-03-26 2009-09-02 杭州汽轮机股份有限公司 Bell type adjusting steam valve
CN201884074U (en) * 2010-12-03 2011-06-29 北京全三维动力工程有限公司 High-pressure regulating valve
CN202280482U (en) * 2011-09-30 2012-06-20 浙江杰特优动力机械有限公司 Quick closing valve for steam turbine
CN205780942U (en) * 2016-06-30 2016-12-07 东方电气集团东方汽轮机有限公司 A kind of steam turbine valve
CN210531645U (en) * 2019-09-23 2020-05-15 浙江华元汽轮机械有限公司 Quick-closing valve and valve core thereof

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4176687A (en) * 1977-08-25 1979-12-04 Cla-Val Co. Hollow spool valve
EP0030083A2 (en) * 1979-10-31 1981-06-10 Fluid Controls, Inc. Solenoid operated relief valve
CN101520095A (en) * 2009-03-26 2009-09-02 杭州汽轮机股份有限公司 Bell type adjusting steam valve
CN201884074U (en) * 2010-12-03 2011-06-29 北京全三维动力工程有限公司 High-pressure regulating valve
CN202280482U (en) * 2011-09-30 2012-06-20 浙江杰特优动力机械有限公司 Quick closing valve for steam turbine
CN205780942U (en) * 2016-06-30 2016-12-07 东方电气集团东方汽轮机有限公司 A kind of steam turbine valve
CN210531645U (en) * 2019-09-23 2020-05-15 浙江华元汽轮机械有限公司 Quick-closing valve and valve core thereof

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