CN210770262U - Steam turbine and quick closing valve thereof - Google Patents
Steam turbine and quick closing valve thereof Download PDFInfo
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- CN210770262U CN210770262U CN201921585069.XU CN201921585069U CN210770262U CN 210770262 U CN210770262 U CN 210770262U CN 201921585069 U CN201921585069 U CN 201921585069U CN 210770262 U CN210770262 U CN 210770262U
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Abstract
The utility model provides a steam turbine and quick-closing valve thereof, the quick-closing valve comprises a shell, a valve seat, a valve core and a valve rod, the shell is provided with 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 right 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 is connected with a driving mechanism after penetrating through the shell; the valve core comprises a valve disc with a hollow columnar structure, one end of the valve disc is opposite to the valve seat and 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 of the sleeve, far away from the valve seat, is fixed on the shell. The quick-closing valve adopts a hollow valve core structure, so that the distribution coordination of the gravity of the quick-closing valve is improved, the opening force is small when the valve disc is separated from the valve seat, the size of the valve rod driving mechanism can be reduced, and the overall size of the quick-closing valve is further reduced.
Description
Technical Field
The utility model relates to a valve, specific theory relates to a fast valve of closing and use this fast steam turbine of closing the valve.
Background
The quick-closing valve is widely applied to high-speed rotating turbomachines such as steam turbines and the like and is a main switching mechanism between a main steam pipeline and the steam turbine. The inlet air of the steam turbine is usually high-parameter steam, the high flow rate of the high-parameter steam can impact the valve core, and when the high-parameter steam flows through an irregular space inside the quick-closing valve, the high-parameter steam is very easy to cause surging, 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 quickly, and the purpose of protecting the unit is achieved; the quick-closing valve is a main switch mechanism for quickly cutting off a high-parameter air source in an emergency, and is an essential component in installation protection.
The conventional valve core is of a solid structure, and the valve rod is of a slender structure, so that the gravity at one end of the valve core of the quick-closing valve is obviously greater than that at the driving end, the incompatibility on the gravity can aggravate shock excitation under the impact of high-pressure steam, and the safety coefficient of the quick-closing valve is reduced.
Based on the above problems, chinese patent publication No. 202280482U discloses a turbine quick-closing valve, in which a part of steam leaks outward along a gap between a valve rod and a sleeve and a bush during opening or after closing of the quick-closing valve, 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 of the quick-closing valve in the opening process, but the internal vibration excitation of the quick-closing valve caused by high-pressure steam impact cannot be solved, so the vibration excitation problem cannot be fundamentally solved, and the quick-closing valve still has great potential safety hazard in the use process.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model discloses a first purpose provides a quick-closing valve adopts hollow case structure, has improved the harmony of the distribution of quick-closing valve gravity, and the opening power when valve dish and disk seat part is less, can reduce valve rod actuating mechanism's size, and then reduces the overall dimension of quick-closing valve.
A second object of the present invention is to provide a steam turbine, the steam inlet of which is provided with the above quick-closing valve.
Based on the above purpose, an aspect of the present invention provides a quick-closing valve, including a housing, a valve seat, a valve element and a valve rod, wherein the housing includes a steam inlet and a steam outlet, the valve seat is disposed at the steam outlet and communicated with the steam outlet, the valve element is disposed in the housing and directly opposite to the valve seat, one end of the valve rod is connected to the valve element, and the other end of the valve rod penetrates through the housing and is then connected to a 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 the 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 steam valve is characterized in that a first air hole used for communicating a steam outlet with an inner cavity of the valve disc is formed 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, 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 gives the head of the valve rod a tendency of being far 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 first air hole can be blocked from being communicated with the inner cavity of the valve disc;
a sleeve is sleeved outside the valve disc, 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;
and the valve disc or the sleeve is provided with an airflow channel for communicating the steam inlet with the cavity in the valve disc.
Preferably, the valve disc is in threaded connection with a valve rod seat, the valve rod seat is provided with a through hole for a valve rod to pass through, 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 abutted against the valve rod seat, and the other end of the first spring is abutted 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 disc together moreover, and in the quick-closing valve operation, guarantee 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 outer wall of the valve disc is provided with a spiral groove, the spiral groove and the sleeve are matched to form an airflow channel, and the airflow channel is communicated with the inner cavity of the valve disc; and 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 hole of the valve disc, the steam inlet is communicated with the first air hole 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 the 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 off-load in addition.
Preferably, one end of the valve disc close to the valve seat is provided with a filter screen. The filter screen is matched with the spiral groove, so that in the process of first guiding and unloading, particles are prevented from entering a steam outlet along with airflow.
Preferably, the outer wall of the valve disc is further provided with an anti-rotation part, the inner wall of the sleeve is provided with a stroke groove extending along the axial direction, and the anti-rotation part is clamped in the stroke groove and can slide along the axial direction in the stroke 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 present invention, a steam turbine is provided that includes a quick-closing valve as described above.
Compared with the prior art, the beneficial effects of the utility model are that:
the quick-closing valve provided by the utility model adopts a hollow valve core structure, so that the distribution harmony 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 to reduce the pressure difference between the steam inlet and the steam outlet and reduce the opening force when the valve disc is separated from the valve seat, so that the size of the valve rod driving mechanism can be reduced, and the whole size of the quick-closing valve is further reduced.
Drawings
The accompanying drawings, which 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 are not intended to limit the application.
Fig. 1 is a schematic structural diagram of a shutdown state of a quick-closing valve system in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a pilot opening state of the quick-closing valve system in the embodiment of the present invention;
fig. 3 is a schematic structural diagram of an operation state of the quick-closing valve system in the embodiment of the present invention.
Wherein, 100, quickly closing the valve; 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 stem seat; 122. filtering with a 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. a source of oil; 26. an oil drain pipe;
211. a piston; 212. a second spring.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Furthermore, in the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The present embodiment provides a valve cartridge of a quick-closing valve, as shown in fig. 1 to 3, including:
a valve disc 12, said valve disc 12 having an inner cavity, said inner cavity penetrating the right end of valve disc 12, the left end of said valve disc 12 having a first air hole 123 for communicating the outer of valve disc 12 and 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, 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 tendency 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, which is sleeved outside the valve disc 12, wherein the right end of the sleeve 13 is used for being fixed on the housing 11 of the quick-closing valve 100, 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 a part of the valve disc 12 is always located in the sleeve 13;
wherein, be equipped with the airflow channel who is used for communicating the outside of valve disc 12 and interior cavity on the periphery wall of valve disc 12, or be equipped with the airflow channel who is used for communicating the outside of valve disc 12 and interior cavity on the periphery wall of sleeve 13, or the cooperation department of valve disc 12 and sleeve 13 is equipped with the airflow channel who is used for communicating the outside of valve disc 12 and interior cavity.
In a preferred embodiment, a valve stem seat 121 is screwed on the valve disc 12, a through hole for the valve stem 14 to pass through is formed on the valve stem seat 121, the head of the valve stem 14 is arranged in a clearance space between the valve disc 12 and the valve stem seat 121, and the outer diameter of the head of the valve stem 14 is larger than the diameter of the through hole; the length of the clearance space between valve disc 12 and stem seat 121 is the sum of the thickness of the head of stem 14 and the length of segment 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. Therefore, 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 the quick-closing valve 100 can not vibrate or rotate due to the impact of air flow in operation.
During the left and right movement of the valve rod 14, a part of the stroke (see section s in fig. 1) can move relative to the valve disc 12, particularly when the valve rod 14 moves from the leftmost position to the right, the valve rod 14 moves to the right to be separated 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 subjected to pilot unloading through the pilot unloading passage before the valve disc 12 is separated from the valve seat 15, the resistance when the valve disc 12 is separated from the valve seat 15 is reduced, and thus, 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; namely, the existence of the idle stroke S ensures that when the valve disc 12 is opened, the steam flow channel is communicated to play a role of pilot unloading, so that the opening force is reduced, and the size of the execution oil cylinder is reduced. Another portion of the travel of valve stem 14 from side-to-side may cause valve disc 12 to move together, thereby effecting separation or engagement of valve disc 12 with valve seat 15.
In a preferred embodiment, a retainer 141 is fixedly disposed on the valve stem seat 121, and the first spring 142 is disposed between the retainer 141 and the valve stem seat 121.
In 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 disposed on the valve rod 14.
In a preferred embodiment, the outer wall of valve disc 12 is provided with a spiral groove, which cooperates with sleeve 13 to form a spiral air flow path. The impact force to the butterfly valve can be reduced in the process that the airflow flows along the spiral airflow channel, and the possibility of shock excitation is reduced; at the same time, the spiral groove design may reduce the parameters of steam from the steam inlet, reducing the opening or closing force of the drive mechanism on valve disc 12.
In a preferred embodiment, the valve stem seat 121 is further provided with a plurality of second air holes, which communicate the left side of the valve stem seat 121 with the right side of the valve stem seat 121, so that when the valve stem 14 moves relative to the valve disc 12, the spiral air flow channel communicates with the first air hole 123; preferably, the valve stem seat 121 may also be a hollow structure, so long as it can ensure the air flow communication between the left and right sides of the valve stem seat 121 in the valve disc 12.
In a preferred embodiment, a strainer 122 is disposed at an end of the valve disc 12 close to the valve seat 15, so as to prevent particles from entering the steam outlet with the steam in the pilot opening state as shown in fig. 2, thereby preventing larger particles from entering the turbine through-flow portion with the impact of high-speed steam, and causing damage to the blades of the through-flow portion and the valve-adjusting sealing surface.
In a preferred embodiment, the screen 122 is attached to the valve disc 12 by rolling.
In a preferred embodiment, an anti-rotation member 124 is fixedly disposed on an outer peripheral wall of valve disc 12, an axially extending travel groove is disposed on an inner wall of sleeve 13, and anti-rotation member 124 is locked in the travel groove and can slide axially in the travel groove with the position change of valve disc 12, so that valve disc 12 can only move axially relative to sleeve 13 and cannot rotate circumferentially relative to sleeve 13. Thus, valve disc 12 is prevented from rotating continuously due to the impact of steam, which is beneficial to reducing abrasion and increasing safety.
Based on the above valve core structure, the present embodiment further provides a quick-closing valve 100, as shown in fig. 1 to 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 communicated with the steam outlet, the valve core is disposed in the housing 11 and directly faces the valve seat 15, one end of the valve rod 14 is connected to the valve core, and the other end of the valve rod penetrates through the housing 11 and is connected to a hydraulic driving mechanism 200; when the valve rod 14 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 or matched with the valve seat 15 in a pressing way, and the communication or the blocking between the steam inlet and the steam outlet is realized;
the valve core comprises a valve disc 12 with a hollow cylindrical 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 with an inner 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 gives the head of the valve rod 14 a tendency 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 is sleeved outside the valve disc 12, one end of the sleeve 13, which is far away from the valve seat 15, is fixed on the inner wall of the housing 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 passage for communicating the steam inlet with the cavity inside the valve disc 12.
In a preferred embodiment, a valve stem seat 121 is screwed on the valve disc 12, a through hole for the valve stem 14 to pass through is formed on the valve stem seat 121, the head of the valve stem 14 is arranged in a clearance space between the valve disc 12 and the valve stem seat 121, and the outer diameter of the head of the valve stem 14 is larger than the diameter 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 first spring 142's effort, in addition with valve rod 14 and valve disc 12 pressure together, in the operation of fast valve 100 of closing, guarantees that both can not produce vibration and rotation because of the impact of air current, promptly: when the force for driving the valve rod 14 to move leftward overcomes the elastic force of the first spring 142, the valve rod 14 can be driven to move leftward, so that a pre-tightening pressure exists in the connection between the valve disc 12 and the valve rod 14, and the vibration of the valve disc 12 and the valve rod 14 is reduced or avoided, thereby avoiding the influence of excitation of high-pressure steam on the sealing property of the connection between the valve disc 12 and the valve seat 15.
In a preferred embodiment, a retainer 141 is fixedly disposed on the valve stem seat 121, and the first spring 142 is disposed between the retainer 141 and the valve stem seat 121.
In 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 disposed on the valve rod 14.
In a preferred embodiment, the outer wall of valve disc 12 is provided with a spiral groove, which cooperates with sleeve 13 to form a spiral air flow passage, which communicates with the inner cavity of valve disc 12; the valve stem base 121 is further provided with a plurality of second air holes, which communicate the left side of the valve stem base 121 with the right side of the valve stem base 121, so that when the head of the valve stem 14 leaves the first air hole 123 of the valve disc 12, the steam inlet communicates with the first air hole 123 via 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 the 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 off-load in addition. Preferably, the valve stem seat 121 may also be a hollow structure, so long as it can ensure the air flow communication between the left and right sides of the valve stem seat 121 in the valve disc 12.
In a preferred embodiment, a strainer 122 is disposed at an end of valve disc 12 adjacent valve seat 15. The screen 122 is engaged with the spiral groove to prevent particles from entering the steam outlet along with the air flow during the process of pilot unloading.
In a preferred embodiment, an anti-rotation member 124 is further disposed on an outer wall of valve disc 12, and a stroke groove extending in the axial direction is disposed on an inner wall of sleeve 13, and anti-rotation member 124 is locked in the stroke groove and can slide in the axial direction in the stroke groove along with the position change of valve disc 12, so that valve disc 12 can only move in the axial direction relative to sleeve 13 and cannot rotate in the circumferential direction relative to sleeve 13.
Based on the structure of the quick-closing valve 100, the present embodiment further provides a quick-closing valve system, which includes the quick-closing valve 100 and the 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 is connected with the hydraulic driving mechanism 200 after penetrating through the shell 11; when the valve rod 14 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 or matched with the valve seat 15 in a pressing way, and the communication or the blocking between the steam inlet and the steam outlet is realized;
the valve core comprises a valve disc 12 with a hollow cylindrical 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 with an inner 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 gives the head of the valve rod 14 a tendency 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 is sleeved outside the valve disc 12, one end of the sleeve 13, which is far away from the valve seat 15, is fixed on the inner wall of the housing 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;
an air flow channel for communicating a steam inlet with a cavity in the valve disc 12 is arranged on the valve disc 12 or the sleeve 13;
the hydraulic driving mechanism 200 includes a hydraulic cylinder 21, a first valve 22, a second valve 23, a second spring 212 and an oil tank, 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 on the part of the hydraulic cylinder 21 located on the left side of the piston 211, a second oil path is arranged on the part located on 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 a shutdown state, the first valve 22 and the second valve 23 are both closed to release pressure, the piston 211 drives the valve rod 14 to move to the left 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 path, then the second valve 23 is opened, quick-closing oil enters the second oil path 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-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 from a steam inlet to a steam outlet 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 that pilot unloading is realized; piston 211 and valve rod 14 continue to move to the right, and valve rod 14 drives valve disc 12 to move to the right so that valve disc 12 is separated from 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 a quick-closing condition, the second oil path is depressurized, the valve rod 14 moves to the left under the action of the second spring 212, the valve disc 12 moves to the left under the driving of the valve rod 14, 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 blocks the first air hole 123. The quick closing valve is closed by spring force, so that the impact is small and the system is stable and reliable.
As a preferred embodiment, the device further comprises an oil source 25, wherein the oil source 25 is communicated with the first oil path through the first valve 22, and the oil source 25 is communicated with the second oil path through the second valve 23.
In a preferred embodiment, a throttle valve 24 is provided in a passage connecting the oil source 25 with the first valve 22 and the second valve 23.
As a preferred embodiment, a drain pipe 26 is further connected to the hydraulic cylinder 21.
In a preferred embodiment, a valve stem seat 121 is screwed on the valve disc 12, a through hole for the valve stem 14 to pass through is formed on the valve stem seat 121, the head of the valve stem 14 is arranged in a clearance space between the valve disc 12 and the valve stem seat 121, and the outer diameter of the head of the valve stem 14 is larger than the diameter 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. Therefore, 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 the quick-closing valve 100 can not vibrate or rotate due to the impact of air flow in operation.
In a preferred embodiment, a retainer 141 is fixedly disposed on the valve stem seat 121, the first spring 142 is disposed between the retainer 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.
In a preferred embodiment, the outer wall of valve disc 12 is provided with a spiral groove, which cooperates with sleeve 13 to form an air flow passage, which communicates with the inner cavity of valve disc 12; the valve stem base 121 is further provided with a plurality of second air holes, which communicate the left side of the valve stem base 121 with the right side of the valve stem base 121, so that when the head of the valve stem 14 leaves the first air hole 123 of the valve disc 12, the steam inlet communicates with the first air hole 123 via 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 the 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 off-load in addition.
In a preferred embodiment, a strainer 122 is disposed at an end of valve disc 12 adjacent valve seat 15. The screen 122 is engaged with the spiral groove to prevent particles from entering the steam outlet along with the air flow during the process of pilot unloading.
In a preferred embodiment, an anti-rotation member 124 is further disposed on an outer wall of valve disc 12, and a stroke groove extending in the axial direction is disposed on an inner wall of sleeve 13, and anti-rotation member 124 is locked in the stroke groove and can slide in the axial direction in the stroke groove along with the position change of valve disc 12, so that valve disc 12 can only move in the axial direction relative to sleeve 13 and cannot rotate in the circumferential direction relative to sleeve 13.
To sum up, the utility model adopts a hollow valve core structure, which improves the distribution coordination 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; the pilot unloading passage is added to reduce the pressure difference between the steam inlet and the steam outlet and reduce the opening force when the valve disc is separated from the valve seat, so that the size of the valve rod driving mechanism can be reduced, and the whole size of the quick-closing valve is further reduced.
Further, it should be noted that:
in the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 the embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments without departing from the spirit and scope of the present invention, and that any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention still fall within the technical scope of the present invention.
Claims (8)
1. A quick-closing valve 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 communicated with the steam outlet, the valve core is arranged in the shell (11) and is right 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 then connected with a hydraulic driving mechanism (200); when the valve rod (14) 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 (15) or matched with the valve seat in a pressing and blocking mode, and the communication or the blocking between the steam inlet and the steam outlet is realized; it is characterized in that the preparation method is characterized in that,
the valve core comprises a valve disc (12) with a hollow cylindrical structure, the left end part of the valve disc (12) is matched with the valve seat (15), and the valve disc (12) is provided with an inner cavity;
the steam valve is characterized in that a first air hole (123) used for communicating a steam outlet with an inner cavity of the valve disc (12) is formed 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), 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 tendency 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 first air hole (123) can be blocked from the inner cavity of the valve disc (12);
a sleeve (13) is sleeved outside the valve disc (12), one end, far away from the valve seat (15), of the sleeve (13) 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);
and an air flow channel for communicating the steam inlet with the cavity in the valve disc (12) is arranged on the valve disc (12) or the sleeve (13).
2. A quick-closing valve according to claim 1, characterized in that a valve stem seat (121) is screwed on the valve disc (12), a through hole for the valve stem (14) to pass through is arranged on the valve stem seat (121), the head of the valve stem (14) is arranged in the clearance space between the valve disc (12) and the valve stem seat (121), and the outer diameter of the head of the valve stem (14) is larger than the aperture of the through hole; one end of the first spring (142) is abutted against the valve rod seat (121), and the other end of the first spring (142) is abutted against the valve rod (14).
3. A quick-closing valve according to claim 2, characterized in that a collar (141) is fixedly arranged on said stem seat (121), said first spring (142) being arranged between said collar (141) and said stem seat (121).
4. A quick-closing valve according to claim 3, characterized in that 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).
5. A quick-closing valve according to claim 2, characterized in that the outer wall of said valve disc (12) is provided with a helical groove which cooperates with said sleeve (13) to define an air flow passage communicating with the inner cavity of the valve disc (12); the valve rod seat (121) is also 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 hole (123) of the valve disc (12), the steam inlet is communicated with the first air hole (123) through the air flow channel and the second air holes.
6. A quick-closing valve according to claim 1, characterized in that the valve disc (12) is provided with a sieve (122) at its end adjacent to the valve seat (15).
7. A quick-closing valve according to claim 1, characterized in that the outer wall of the valve disc (12) is further provided with an anti-rotation member (124), the inner wall of the sleeve (13) is provided with a stroke slot extending along the axial direction, and the anti-rotation member (124) is clamped in the stroke slot and can slide along the axial direction in the stroke slot 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) and can not rotate circumferentially relative to the sleeve (13).
8. A steam turbine comprising a quick-closing valve according to any of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921585069.XU CN210770262U (en) | 2019-09-23 | 2019-09-23 | Steam turbine and quick closing valve thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921585069.XU CN210770262U (en) | 2019-09-23 | 2019-09-23 | Steam turbine and quick closing valve thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110500414A (en) * | 2019-09-23 | 2019-11-26 | 浙江华元汽轮机械有限公司 | Steam turbine and its quick-closing valve |
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2019
- 2019-09-23 CN CN201921585069.XU patent/CN210770262U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110500414A (en) * | 2019-09-23 | 2019-11-26 | 浙江华元汽轮机械有限公司 | Steam turbine and its quick-closing valve |
| CN110500414B (en) * | 2019-09-23 | 2024-04-09 | 浙江华元汽轮机械有限公司 | Steam turbine and quick-closing valve thereof |
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