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CN114183554B - Plug valve - Google Patents

Plug valve Download PDF

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Publication number
CN114183554B
CN114183554B CN202111302112.9A CN202111302112A CN114183554B CN 114183554 B CN114183554 B CN 114183554B CN 202111302112 A CN202111302112 A CN 202111302112A CN 114183554 B CN114183554 B CN 114183554B
Authority
CN
China
Prior art keywords
valve
valve body
core
cylindrical
handle
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
CN202111302112.9A
Other languages
Chinese (zh)
Other versions
CN114183554A (en
Inventor
王冬
李磊磊
赵健
杜国飞
李媛媛
苗利蕾
周晓蕾
沈伟
白燕
赵本华
刘畅
张风光
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.)
Beijing Satellite Manufacturing Factory Co Ltd
Original Assignee
Beijing Satellite Manufacturing Factory Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Beijing Satellite Manufacturing Factory Co Ltd filed Critical Beijing Satellite Manufacturing Factory Co Ltd
Priority to CN202111302112.9A priority Critical patent/CN114183554B/en
Publication of CN114183554A publication Critical patent/CN114183554A/en
Application granted granted Critical
Publication of CN114183554B publication Critical patent/CN114183554B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/04—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having cylindrical surfaces; Packings therefor
    • F16K5/0407—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having cylindrical surfaces; Packings therefor with particular plug arrangements, e.g. particular shape or built-in means
    • 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
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
    • F16K27/065—Construction of housing; Use of materials therefor of taps or cocks with cylindrical plugs
    • 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
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/08—Guiding yokes for spindles; Means for closing housings; Dust caps, e.g. for tyre valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/60—Handles
    • F16K31/607—Handles characterised by particular material, by special measures to obtain aesthetical effects, or by auxiliary functions, e.g. storage
    • 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
    • F16K35/00—Means to prevent accidental or unauthorised actuation
    • F16K35/02—Means to prevent accidental or unauthorised actuation to be locked or disconnected by means of a pushing or pulling action
    • F16K35/027—Means to prevent accidental or unauthorised actuation to be locked or disconnected by means of a pushing or pulling action the locking mechanism being actuated by pushing or pulling the valve actuator, the valve actuator being rotated subsequently to bring the valve closure element in the desired position
    • 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
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0008—Mechanical means
    • 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
    • F16K41/00—Spindle sealings
    • F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
    • F16K41/04—Spindle sealings with stuffing-box ; Sealing rings with at least one ring of rubber or like material between spindle and housing
    • 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
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/04—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having cylindrical surfaces; Packings therefor
    • F16K5/0442—Spindles and actuating means
    • 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
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/04—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having cylindrical surfaces; Packings therefor
    • F16K5/0457—Packings
    • F16K5/0471—Packings between housing and plug
    • 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
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/04—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having cylindrical surfaces; Packings therefor
    • F16K5/0457—Packings
    • F16K5/0478—Packings on the plug
    • 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
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/04—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having cylindrical surfaces; Packings therefor
    • F16K5/0457—Packings
    • F16K5/0485—Spindle sealing

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lift Valve (AREA)
  • Details Of Valves (AREA)

Abstract

The invention discloses a plug valve, which comprises a valve body, a handle and a valve core, wherein the valve core is arranged in the valve body, the lower end of the valve core is a cylindrical core part which is in rotatable close contact fit with the cylindrical inner wall of the valve body, and a second through hole penetrating through the outer surface of the cylinder is arranged in the middle position of the cylindrical core part of the valve core; a dot matrix air hole is arranged on the inlet end face of the medium inlet part of the valve body, which is close to one end of the valve core; the sealing assembly comprises an inner sealing piece, the axis of the inner sealing piece coincides with the second through hole, the inner sealing piece is arranged between the inner wall of the valve body and the cylindrical surface of the valve core, and the sealing assembly further comprises a valve seat and a limiting assembly. The plug valve provided by the invention has good sealing property and switching reliability, can be operated by using smaller rotation moment, is comfortable and simple to operate, and can meet the bidirectional flow stop requirement of a working medium.

Description

Plug valve
Technical Field
The invention relates to the technical field of valves, in particular to a plug valve for an oxygen supply system in the field of aerospace.
Background
The oxygen supply system is used as an important component in the space station environmental control life-support subsystem, and is mainly used for guaranteeing oxygen supply in the cabin and creating a comfortable space environment for astronauts. The plug valve in the oxygen supply system is used as an important valve body of the oxygen supply system, and performs a switching function on the oxygen path system. The plug valve is required to adapt to various mechanical environments such as ground installation, launching and lifting, space on orbit, returning to the earth stage along with a spacecraft, and the like, and meets the requirements of being capable of adapting to different media, adapting to medium temperature with larger temperature difference, and the like. The plug valve of the oxygen supply system of the space station adopts manual operation, so that not only is good tightness and switching reliability required, but also the pressing force and the rotating moment of the valve are reduced as much as possible, the requirement of higher ergonomic index is met, and meanwhile, the requirement of bidirectional flow stop of a working medium is also met.
The invention patent CN 112413158A discloses a plug valve in a CO2 air conditioning system, which comprises a hollow valve body, wherein a throttle column with a through hole is arranged in the valve body, and is characterized in that the throttle column is floatingly arranged in an inner cavity of the valve body, an expansion groove is arranged on the throttle column, cylindrical sealing elements are symmetrically arranged on the left side and the right side of the throttle column, and contact surfaces which are matched with the shape of the throttle column are arranged on the cylindrical sealing elements to form hard sealing together; the inner cavity of the valve body is positioned at the left side and the right side of the cylindrical surface sealing piece, a guide pipe, a conical surface annular gasket, a butterfly spring and a blocking cover are further arranged, one end of the guide pipe is supported on the cylindrical surface sealing piece in a sealing way, the other end of the guide pipe is supported on the blocking cover in a sealing way, the conical surface annular gasket is sleeved on the guide pipe, the butterfly spring is sleeved on the blocking cover, and the cylindrical surface sealing piece is tightly held on the throttling column by the butterfly spring to form a sealing way through the blocking cover. In the prior art, the plug valve can realize bidirectional flow under the working condition of larger temperature fluctuation, but has complex structure, and needs larger rotating moment to operate because of hard sealing, so that heavy weight is caused by a plurality of parts, the plug valve has the characteristic of not being light in weight, and the requirement of light in the aerospace field is not met.
Disclosure of Invention
The invention aims to solve the technical problem of providing the light-weight plug valve which has good sealing performance and switching reliability, can be operated by using smaller rotation moment, is comfortable and simple to operate, and can meet the bidirectional flow stop requirement of a working medium.
The plug valve provided by the invention comprises a valve body, wherein the valve body is provided with a first installation opening part, a medium inlet part and a medium outlet part with a medium outlet, and a medium circulation channel is formed between the medium inlet part and the medium outlet part;
the lower end of the handle is fixedly connected with the first mounting opening of the valve body in a rotatable mode;
The valve core is arranged in the valve body, the upper part of the valve core is a connecting rod part, the connecting rod part is fixedly connected with the handle in a synchronous rotation manner, the lower end of the valve core is a cylindrical core part which is matched with the cylindrical inner wall of the valve body in a rotatable and tight contact manner, and a second through hole penetrating through the outer surface of the cylinder is formed in the middle position of the cylindrical core part of the valve core; when the plug valve is in an open state, two ends of the second through hole are in medium communication with the medium inlet part and the medium outlet part; the middle part of the valve core is a cylindrical rod part;
the medium outlet is a first through hole at one end of the medium outlet close to the valve core;
A dot matrix air hole is arranged on the inlet end face of the medium inlet part of the valve body, which is close to one end of the valve core;
the outer circumferential surface of the cylindrical core part of the valve core is provided with a circular groove, the diameter of the circular groove is larger than that of the first through hole, and the axis of the circular groove is coincident with the axis of the second through hole;
The sealing assembly comprises an inner sealing piece, is arranged between the inner wall of the valve body and the cylindrical surface of the valve core, and is fixedly accommodated in the circular groove.
Compared with the traditional spherical valve core, the cylindrical valve core of the plug valve has smaller friction force in rotation and smaller required rotation moment.
In the concept of the present invention, it is important that the sealing assembly is not damaged when the valve core is rotated in the valve body to open or close the medium passage. The sealing assembly is divided into an inner sealing piece for inner sealing and an O-shaped sealing ring for outer sealing, when the inner sealing piece is damaged, a medium can leak into the inner cavity of the valve body, and the O-shaped sealing ring blocked by the outer sealing cannot leak to the outside of the valve body. So for the plug valve according to the present invention, good tightness of the inner and outer seals is critical.
Unlike the conventional mounting mode of the sealing member sleeved on the valve core, the inner sealing member of the plug valve is arranged on the outer surface of the cylindrical core part of the valve core, specifically, a circular groove is arranged on the outer circumferential surface of the valve core, and the axis of the circular groove is coincident with the axis of the second through hole. When the valve core rotates to the on position, the inner sealing element is positioned at the periphery of the dot matrix air hole arranged on the end face of the inlet, so that the medium flows out of the medium inlet part of the valve body through the second through hole of the valve core or flows out of the medium outlet part of the valve body through the second through hole of the valve core and flows out of the medium inlet part of the valve body.
The medium outlet part is in medium communication with the inner cavity of the valve body through a first through hole of a large-diameter outlet, the part, connected with the first through hole of the large-diameter outlet, of the inner cavity of the valve body is a large-space hollow round structure, and the large-space hollow round structure is positioned on the same cylindrical surface of the cylindrical inner wall of the valve body and is provided with a 90-degree cutting edge. The medium inlet part is communicated with the inner cavity of the valve body through dot matrix air hole medium, and the dot matrix air holes are uniformly distributed on the end face of the inlet and are small-diameter air holes. The part of the valve body inner cavity connected with the lattice type air hole is the inlet end face with a space mesh screen structure. Although each small-diameter air hole is still a small-space hollow round structure with a cutting edge at the connecting position of each small-diameter air hole and the inlet end face, the small-space hollow round structure cannot greatly damage the whole cylindrical inner wall of the inlet end face due to the small diameter. When the handle is rotated, the valve core is driven to rotate in the valve body to open or stop a medium circulation channel, and the inner sealing element and the inlet end face have a dynamic friction force in rotation, but the cutting edge of the smaller space hollow round structure cannot have a large cutting force on the inner sealing element, so that the inner sealing element is protected in the use process, and the service life of the plug valve related to the invention is prolonged.
Because the diameter of the circular groove is larger than that of the first through hole, when the plug valve is in an open state, the inner sealing piece can enclose the inlet end face in the sealing range of the inner sealing piece, so that the inner sealing effect on a flowing medium can be well achieved.
In the plug valve of the present invention, the medium may flow in both directions. That is, in the open state of the plug valve according to the present invention, the medium can flow forward from the medium inlet portion to the medium outlet portion. It is also possible to flow reversely from the medium outlet portion to the medium inlet portion. The forward pressure when flowing from the medium outlet portion to the medium inlet portion is smaller than the reverse pressure when flowing from the medium outlet portion to the medium inlet portion. The medium inlet portion and the medium outlet portion in the present invention are just one descriptive name, and are not to be construed as limiting the present invention.
According to one aspect of the invention, the lattice type air holes are uniformly distributed round air holes with the same diameter, and the diameter of the lattice type air holes is 1/4-1/6 of the diameter of the medium outlet. The ratio of the sum of the areas of the lattice type air holes to the area of the first through holes is more than 45%. The ventilation flow of the lattice type air holes which are uniformly distributed can reach more than 45% of the ventilation flow of the first through hole, so that the inner sealing piece is protected, and the flow requirement of the aerospace oxygen supply system is met.
According to one aspect of the invention, a polygonal hole is arranged at the center of the upper part of the handle, the connecting rod part of the valve core is a polygonal cylinder and can be inserted into the polygonal hole of the handle in a matched mode.
Through simple appearance of case connecting rod portion with the cooperation of the polygonal hole of handle can realize the synchronous rotation between handle and the case, has reduced the quantity of the part that realizes the rotation, has realized the lightweight.
According to one aspect of the invention, a square hole is arranged at the center of the upper part of the handle, the connecting rod part of the valve core is a square cylinder and can be inserted into the square hole of the handle in a matched mode, or the connecting rod part of the valve core is a triangular cylinder and can be inserted into the triangular hole of the handle in a matched mode, or the connecting rod part of the valve core is a hexagonal cylinder and can be inserted into the hexagonal hole of the handle in a matched mode.
When the triangle or quadrilateral matching is used for realizing rotation, the rotation is reliable, and the rotation moment is further reduced; when the six-shaped appearance is matched to realize rotation, the weight of the handle and the valve core is further lightened while the reliable rotation is realized, so that the lightweight realization of the plug valve is facilitated;
according to an aspect of the present invention, the valve body further includes a second mounting opening portion provided coaxially with the first mounting opening portion, the second mounting opening portion fixedly mounting a valve seat;
also comprises an upper supporting gasket and a lower supporting gasket,
The upper support gasket is arranged between the upper end face of the cylindrical core part and the valve body and sleeved on the upper part of the valve core; the outer circular surface of the upper support gasket is tightly contacted with the surface of the cylindrical inner wall of the valve body; the inner hole surface of the upper support gasket is tightly contacted with the outer circle surface of the lower part of the cylindrical rod part; the upper side surface of the upper support gasket is tightly contacted with the upper surface of the cylindrical inner wall of the valve body; the lower side surface of the upper support gasket is tightly contacted with the upper surface of the cylindrical core part;
The lower support gasket is arranged between the lower end face of the cylindrical core part and the valve body and sleeved at the lower part of the cylindrical core part; the outer circular surface of the lower support gasket is tightly contacted with the surface of the cylindrical inner wall of the valve body; the inner hole surface of the lower support gasket is tightly contacted with the outer circle surface of the lower part of the cylindrical core part; the upper side surface of the lower support gasket is tightly contacted with the lower surface of the cylindrical core part of the valve core; the lower side surface of the lower support gasket is tightly contacted with the upper surface of the valve seat;
Since the inner seal is located at one side of the circumference of the cylindrical core and has a surface higher than the outer circumferential surface of the cylindrical core. The extrusion force of the cylindrical inner wall of the valve body, which is received by the inner sealing element, can be transmitted to the cylindrical core part of the valve core, if the valve core is not circumferentially supported and limited, the problem that the coaxiality of the valve core is out of tolerance in the installation of the valve core in the valve body can be caused, so that the valve core and the sealing assembly are worn in use, and the service life of the plug valve is reduced. In order to avoid the problem of eccentric mounting of the valve element and the valve body, according to the concept of the present invention, the second mounting opening portion coaxially provided with the first mounting opening portion is first provided at the lower portion of the valve body, and coaxial rotation of the valve element and the valve body is ensured by machining accuracy. And in the cavity department between case and the valve body, closely laminated has set up go up support gasket with lower support gasket utilizes go up support gasket with lower support gasket carries out spacingly to the axial position and the circumference of case, guarantees that the case can not be in the valve body axial float and circumference rock, can effectively protect seal assembly, extension seal assembly's life.
According to one aspect of the invention, the sealing assembly further comprises a first O-ring, a second O-ring, a third O-ring and a fourth hollow cylindrical sealing ring for external sealing;
the first O-shaped sealing ring and the second O-shaped sealing ring are sleeved on the cylindrical core body and are respectively positioned above and below the second through hole;
The third O-shaped sealing ring is embedded in the upper part of the first installation opening part of the valve body and is positioned above the first O-shaped sealing ring;
The fourth hollow cylindrical sealing ring is sleeved on the upper part of the valve seat and is positioned between the outer circular surface of the upper part of the valve seat and the inner surface of the second installation opening part.
In the plug valve according to the present invention, a double outer seal is provided. Specifically, the first O-shaped sealing ring and the second O-shaped sealing ring are first-stage external sealing, and the inner cavity of the valve body is sealed for the first stage; the third O-shaped sealing ring and the fourth hollow cylindrical sealing ring are second-stage external sealing, and the medium flowing between the valve body and the valve core and between the valve core and the valve seat is further sealed in the second stage.
According to one aspect of the present invention, the first O-ring, the second O-ring, the third O-ring and the fourth hollow cylindrical ring for external sealing are silicone rubber O-rings; the inner sealing piece is an ethylene propylene diene monomer O-shaped sealing ring.
The ethylene propylene diene monomer has excellent ultraviolet resistance, heat aging resistance, low temperature resistance, ozone resistance, chemical medium resistance, water resistance, good electrical insulation and elasticity, and the applicable temperature range is 50 ℃ below zero to 150 ℃. And among all rubbers, the ethylene propylene diene monomer has the lowest specific gravity, which is beneficial to light weight. The silicone rubber has good low temperature resistance and can still work at-55 ℃. The heat resistance of the silicone rubber is also outstanding, and the silicone rubber can work for a long time at 180 ℃. In addition, the valve body, the valve core and the valve seat are made of metal, so that the valve can be normally used in a wider working temperature range. In conclusion, the plug valve has good high-temperature and low-temperature resistance, and can be suitable for various mechanical environments such as ground installation, launching lift, space on-orbit, returning to earth stage along with a spacecraft and the like in the aerospace field.
According to one aspect of the invention, the plug valve further comprises a limiting component; the limiting assembly comprises a first U-shaped groove and a second U-shaped groove which are symmetrically arranged on the peripheral surface of the upper part of the valve body, and openings of the first U-shaped groove and the second U-shaped groove start from the upper end surface of the valve body;
the novel U-shaped handle is characterized by further comprising a first limiting block and a second limiting block which are matched with the first U-shaped groove and the second U-shaped groove are arranged at the lower part of the handle, and the first limiting block and the second limiting block are slidably arranged in the first U-shaped groove and the second U-shaped groove.
Because a larger space hollow round structure with a 90-degree cutting edge is formed between the first through hole and the cylindrical inner wall of the valve body, when the handle is misoperated and the side provided with the inner sealing element is turned to the side of the first through hole, the inner sealing element can be scratched by the cutting edge of the larger space hollow round structure, so that the plug valve disclosed by the invention loses the inner sealing performance, the leakage of oxygen in an oxygen supply system can be caused, and safety accidents can be possibly caused. Therefore, the first U-shaped groove and the second U-shaped groove are formed in the upper end of the valve body and are matched with the first limiting block and the second limiting block at the lower end of the handle, so that the movement of the handle is limited to rotate within a 90-degree range. Ensuring that the handle can only rotate within a limited 90 deg. range avoids the inner seal being damaged. And simultaneously, the handle can accurately position the communicated and closed positions of the plug valve.
According to one aspect of the present invention, the plug valve further includes a locking nut provided with a locking external thread at an upper portion of the connection rod portion, the locking nut being screwed on the locking external thread.
The limiting assembly further comprises a handle spring, wherein the handle spring is arranged between the lower part of the handle and the upper part of the valve body, sleeved on the upper part of the cylindrical rod part in the middle of the valve core, and kept in a compressed state.
When the first limiting block and the second limiting block rotate in the first U-shaped groove and the second U-shaped groove, downward pressure is required to be applied to the handle, and the downward pressure is used for balancing the elasticity of the handle spring. When the handle rotates to an opening or closing position, the handle is released, and at this time, the handle spring gives an upward elastic force to the handle, so that the first limiting block and the second limiting block of the handle enter the vertical opening parts of the first U-shaped groove and the second U-shaped groove and are limited to be positioned at the openings of the first U-shaped groove and the second U-shaped groove only.
According to one aspect of the invention, the upper end of the handle is provided with a straight shape, the width-to-length ratio range is 1/3-1/4, and the handle has a smooth arc curved surface;
The handle is in a straight shape, the top surface is in transition smooth curved surface, the rounding treatment is carried out, the requirements of manual grasping by ergonomic human can be met, a large operation force arm can be provided, manual operation is convenient, and the ergonomic design of the handle is verified by the center of Chinese astronauts.
Compared with the prior art, the invention has the following remarkable beneficial effects:
According to the plug valve provided by the invention, bidirectional opening and closing of a circulating medium are realized through the cooperation of the cylindrical inner wall of the valve body and the cylindrical core part of the valve core, and the sealing mode of combining the elastic sealing ring with the hard metal wall is provided for sealing, so that the plug valve can be operated by using smaller rotation moment. Good tightness can be achieved by the inner seal and the double outer seal; the valve body, the valve core and the valve seat which are made of metal and the sealing component which has good low temperature resistance, high temperature resistance and corrosion resistance enable the plug valve to meet the requirements of being capable of adapting to different media, adapting to medium temperature with large temperature difference and the like. The reliability of the plug valve switch related to the invention can be realized through the matched sliding of the first U-shaped groove, the second U-shaped groove, the first limiting block and the second limiting block and the matched sliding of the handle and the handle spring, the switch operation is quick and accurate, and misoperation can be effectively avoided. The handle is simple in rotating structure, and the handle with the excellent ergonomic effect is arranged in a straight shape, so that the operation is comfortable and convenient. The plug valve designed by the invention has a simple integral structure, realizes light weight by controlling the number of parts and the weight of the parts, and effectively saves the emission cost of a spacecraft provided with the plug valve.
Drawings
FIG. 1 is a cross-sectional view of a plug valve according to one embodiment of the present invention;
FIG. 2 is a schematic illustration of the structure of the spool of a plug valve according to one embodiment of the present invention;
FIG. 3 is a schematic view of the structure of a body of a plug valve according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of a body of a plug valve according to one embodiment of the present invention;
FIG. 5 is an A-A cross-sectional view of the body of the plug valve according to one embodiment of the present invention of FIG. 4;
fig. 6 is a bottom view of a communication state of a plug valve according to an embodiment of the present invention;
FIG. 7 is a partial cross-sectional view of a valve body of a plug valve in a blocking state according to one embodiment of the present invention;
FIG. 8 is a schematic diagram of the lattice type air holes of a plug valve according to an embodiment of the present invention;
fig. 9 is a three-dimensional schematic of a plug valve according to one embodiment of the invention.
Figure number: 1-a valve body; 1 a-a cylindrical inner wall; 11-a first mounting opening; 12-a media inlet portion; 12 a-lattice type air holes; 13-a media outlet portion; 13 a-a first through hole; 14-a second mounting opening; 2-a handle; 3-valve core; 31-a connecting rod portion; 32-a cylindrical stem; 33-a cylindrical core; 33 a-a second through hole; 33 b-circular grooves; 4-locking nuts; a 5-seal assembly; 51-inner seal; 52-a first O-ring seal; 53-a second O-ring seal; 54-a third O-shaped sealing ring; 55-fourth hollow cylindrical sealing rings; 6-valve seat; 7-upper support shims; 8-a lower support pad; 9-a limiting assembly; 91-a first U-shaped groove; 92-a second U-shaped groove; 93-a first limiting block; 94-a second limiting block; 95-handle spring;
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is apparent that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
The present invention will be described in detail below with reference to the drawings and the detailed description, but the embodiments of the present invention are not limited to the following examples.
As shown in fig. 1,2, 4, 8 and 9, the plug valve according to an embodiment of the present invention includes a valve body 1, the valve body 1 having a first installation opening 11, a medium inlet 12 and a medium outlet 13 having a medium outlet, and a medium flow passage is formed between the medium inlet 12 and the medium outlet 13;
the lower end of the handle 2 is fixedly connected with the first mounting opening of the valve body 1 in a rotatable manner;
The valve core 3 is arranged in the valve body 1, the upper part of the valve core 3 is a connecting rod part 31, the connecting rod part 31 is fixedly connected with the handle 2 in a synchronous rotation manner, the lower end of the valve core 3 is a cylindrical core part 33 which is matched with the cylindrical inner wall 1a of the valve body 1 in a rotatable and tight contact manner, and a second through hole 33a penetrating through the outer surface of the cylinder is formed in the middle position of the cylindrical core part 33 of the valve core 3; when the plug valve is in an open state, two ends of the second through hole 33a are in medium communication with the medium inlet part 12 and the medium outlet part 13; the middle part of the valve core 3 is a cylindrical rod part 32;
the medium outlet is a first through hole 13a of the medium outlet 13 near one end of the valve core 3;
a dot matrix air hole 12a is arranged on the inlet end face of the medium inlet part 12 of the valve body 1, which is close to one end of the valve core 3;
The outer circumferential surface of the cylindrical core 33 of the spool 3 is provided with a circular groove 33b, the diameter of the circular groove 33b is larger than that of the first through hole 13a, and the axis of the circular groove 33b coincides with the axis of the second through hole 33 a;
the sealing assembly 5, the sealing assembly 5 includes an inner sealing member 51, is disposed between the inner wall of the valve body 1 and the cylindrical surface of the valve core 3, and is fixedly accommodated in the circular groove 33 b.
According to an embodiment of the present invention, the valve body 1 further includes a second mounting opening portion 14 provided coaxially with the first mounting opening portion 11, the second mounting opening portion 14 fixedly mounting the valve seat 6;
also comprises an upper support pad 7 and a lower support pad 8,
The upper supporting gasket 7 is arranged between the upper end surface of the cylindrical core 33 and the valve body 1 and sleeved on the upper part of the valve core 3; the outer circumferential surface of the upper support pad 7 is in close contact with the surface of the cylindrical inner wall 1a of the valve body 1; the inner hole surface of the upper support pad 7 is closely contacted with the outer circle surface of the lower part of the cylindrical rod part 32; the upper side of the upper support pad 7 is in close contact with the upper surface of the cylindrical inner wall 1a of the valve body 1; the lower side of the upper support pad 7 is in close contact with the upper surface of the cylindrical core 33;
The lower support gasket 8 is arranged between the lower end surface of the cylindrical core 33 and the valve body 1 and sleeved at the lower part of the cylindrical core 33; the outer circumferential surface of the lower support pad 8 is in close contact with the surface of the cylindrical inner wall 1a of the valve body 1; the inner hole surface of the lower support pad 8 is in close contact with the outer circumferential surface of the lower portion of the cylindrical core 33; the upper side of the lower support pad 8 is in close contact with the lower surface of the cylindrical core 33 of the valve core 3; the lower side surface of the lower supporting gasket 8 is tightly contacted with the upper surface of the valve seat 6;
As shown in fig. 8, in the plug valve according to an embodiment of the present invention, the lattice type air holes 12a are uniformly distributed circular air holes having the same diameter, and the diameter of the lattice type air holes 12a is 1/4 of the diameter of the medium outlet. The ratio of the sum of the areas of the lattice-type air holes 12a to the area of the first through holes 13a is in the range of 40% -60%. The ventilation flow of the lattice type air holes 12a which are uniformly distributed can reach 40% -60% of the ventilation flow of the first through holes 13a, so that the inner sealing piece 51 is protected, and the flow requirement of the aerospace oxygen supply system is met.
In the plug valve according to an embodiment of the present invention, a square hole is provided at the upper center of the handle 2, and the connecting rod portion 31 of the valve core 3 is a square cylinder and is fittingly inserted into the square hole of the handle 2.
As shown in fig. 1, in the plug valve according to an embodiment of the present invention, the sealing assembly 5 further includes a first O-ring 52 for external sealing, a second O-ring 53, a third O-ring 54, and a fourth hollow cylindrical seal 55;
The first O-shaped sealing ring 52 and the second O-shaped sealing ring 53 are sleeved on the cylindrical core body and are divided into a part above and a part below the second through hole 33 a;
The third O-ring 54 is fitted over the first mounting opening 11 of the valve body 1,
Is located above the first O-ring 52;
The fourth hollow cylindrical sealing ring 55 is sleeved on the upper part of the valve seat 6, and is positioned between the outer circular surface of the upper part of the valve seat 6 and the inner surface of the second installation opening part 14.
In the plug valve according to an embodiment of the present invention, the first O-ring 52, the second O-ring 53, the third O-ring 54, and the fourth hollow cylindrical ring 55 for external sealing are silicone rubber O-rings; the inner seal 51 is an ethylene propylene diene monomer O-ring.
As shown in fig. 3, 5 and 6, the plug valve according to one embodiment of the present invention further includes a limiting component 9; the limiting assembly 9 comprises a first U-shaped groove 91 and a second U-shaped groove 92 which are symmetrically arranged on the peripheral surface of the upper part of the valve body 1, and the openings of the first U-shaped groove 91 and the second U-shaped groove 92 start from the upper end surface of the valve body 1;
the handle is characterized by further comprising a first limiting block 93 and a second limiting block 94 which are matched with the first U-shaped groove 91 and the second U-shaped groove 92 are arranged at the lower part of the handle 2, and the first limiting block 93 and the second limiting block 94 are slidably arranged in the first U-shaped groove 91 and the second U-shaped groove.
As shown in fig. 1, in the plug valve according to an embodiment of the present invention, a locking nut 4 is further included, and a locking external thread is provided at an upper portion of the connection rod portion 31, and the locking nut 4 is screwed on the locking external thread.
The limiting assembly 9 further comprises a handle spring 95, wherein the handle spring 95 is arranged between the lower part of the handle 2 and the upper part of the valve body 1, sleeved on the upper part of the cylindrical rod part 32 in the middle of the valve core 3, and kept in a compressed state.
As shown in fig. 6, in the plug valve according to an embodiment of the present invention, the upper end of the handle 2 is provided with a straight shape, the width-to-length ratio range is 1/4, and the plug valve has a smooth arc curved surface;
The plug valve according to an embodiment of the present invention has a two-position two-way structure, the valve body 1 is provided with a medium inlet portion 12 and a medium outlet portion 13, and the valve core 3 is provided with a second through hole 33a. When the handle 2 of the plug valve is in the open position, the second through hole 33a communicates the medium inlet portion 12 and the medium outlet portion 13 of the valve body 1, so that the flow rate is maximized and the pressure loss is reduced.
According to the plug valve in one embodiment of the invention, the valve core 3 is driven by the handle 2 to rotate in the valve body 1 to control the opening and closing of the valve, and the inlet end face is provided with the lattice type air hole 12a, so that the bidirectional flow stopping function of the plug valve is realized, the plug valve can be applied to an oxygen path system of a space station environmental control biological protection and distribution system, and the application range of the plug valve is expanded by the structure.
The plug valve of one embodiment of the present invention can ensure that the sealing assembly 5 is not damaged when the valve core 3 rotates to open or close the medium passage in the valve body 1. The sealing assembly 5 is divided into an inner sealing element 51 for inner sealing and an O-shaped sealing ring for outer sealing, when the inner sealing element 51 is damaged, a medium can leak into the inner cavity of the valve body 1, and the O-shaped sealing ring blocked by the outer sealing cannot leak out of the valve body 1. So good tightness of the inner and outer seals is critical to the plug valve of one embodiment of the present invention.
Unlike the conventional manner of mounting the seal member on the spool 3, the inner seal member 51 of the plug valve of one embodiment of the present invention is provided on the outer surface of the cylindrical core 33 of the spool 3, specifically, the circular groove 33b is provided on the outer circumferential surface of the spool 3, and the axis of the circular groove 33b coincides with the axis of the second through hole 33 a. When the valve body 3 is rotated to the on position, the inner seal member 51 is fixedly arranged in the circular groove 33b, and the inner seal member 51 is positioned at the periphery of the dot matrix air hole 12a arranged on the inlet end surface, so that the medium flows out from the medium inlet part 12 of the valve body 1, through the second through hole 33a of the valve body 3, from the medium outlet part 13 of the valve body 1 or flows out from the medium outlet part 13 of the valve body 1, through the second through hole 33a of the valve body 3, and from the medium inlet part 12 of the valve body 1.
The medium outlet part 13 is in medium communication with the inner cavity of the valve body 1 through a first through hole 13a of a large-diameter outlet, the part of the inner cavity of the valve body 1 connected with the first through hole 13a of the large-diameter outlet is a larger space hollow round structure, and the larger space hollow round structure is positioned on the same cylindrical surface of the cylindrical inner wall 1a of the valve body 1 and provided with a 90-degree cutting edge. The medium inlet 12 is in medium communication with the inner cavity of the valve body 1 through dot matrix air holes 12a, and the dot matrix air holes 12a are uniformly distributed on the inlet end surface and are small-diameter air holes. The part of the inner cavity of the valve body 1 connected with the lattice type air hole 12a is an inlet end face with a space mesh screen structure. Although each small-diameter air hole is still a small-space hollow round structure with a cutting edge at the connecting part of the small-diameter air hole and the inlet end face, the small-space hollow round structure cannot greatly damage the inner wall of the whole cylindrical surface of the inlet end face because of the small diameter. When the handle 2 is rotated, so as to drive the valve core 3 to rotate in the valve body 1 to open or close a medium circulation channel, the inner sealing element 51 and the inlet end face have a dynamic friction force in rotation, but the cutting edge of the smaller space hollow round structure cannot have a large cutting force on the inner sealing element 51, so that the inner sealing element 51 is protected in the use process, and the service life of the plug valve of one embodiment of the invention is prolonged.
Because the diameter of the circular groove 33b is larger than the diameter of the first through hole 13a, when the plug valve of one embodiment of the present invention is in an open state, the inner seal member 51 can enclose the inlet end face within its sealing range, so that the inner seal effect can be well exerted on the flowing medium.
In the plug valve according to an embodiment of the present invention, the medium may flow in both directions. I.e. in the open state of the plug valve according to one embodiment of the invention, medium can flow positively from the medium inlet portion 12 to the medium outlet portion 13. It is also possible to flow reversely from the medium outlet portion 13 to the medium inlet portion 12. The forward pressure when flowing from the medium outlet portion 13 to the medium inlet portion 12 is smaller than the reverse pressure when flowing from the medium outlet portion 13 to the medium inlet portion 12. In the plug valve according to an embodiment of the present invention, the medium inlet portion 12 and the medium outlet portion 13 are just one descriptive name, and are not to be construed as limiting one embodiment of the present invention.
In the plug valve of the embodiment of the invention, the synchronous rotation between the handle 2 and the valve core 3 can be realized through the cooperation of the square appearance of the connecting rod part 31 of the valve core 3 and the square inner hole of the handle 2, so that the number of parts for realizing rotation is reduced, and the weight is reduced. When square matching is used for realizing rotation, the rotation is reliable, and the rotation moment is further reduced;
As shown in fig. 7, since the inner seal member 51 is located at one side of the circumference of the cylindrical core 33 and has a surface higher than the outer circumferential surface of the cylindrical core. The extrusion force of the cylindrical inner wall 1a of the valve body 1 received by the inner sealing member 51 is transmitted to the cylindrical core 33 of the valve core 3, and if the valve core 3 is not supported and limited circumferentially, the problem of poor coaxiality of the valve core 3 installed in the valve body 1 may be caused. Thereby causing wear to the valve core 3 and seal assembly 5 in use, reducing the service life of the plug valve. In order to avoid the problem of eccentric mounting of the valve body 3 and the valve body 1, according to the concept of the present invention, first, a second mounting opening 14 is provided at the lower portion of the valve body 1 coaxially with the first mounting opening 11, and coaxial rotation of the valve body 3 and the valve body 1 is ensured by machining accuracy. And in the cavity department between case 3 and valve body 1, closely laminated has set up upper support gasket 7 and lower support gasket 8, utilizes upper support gasket 7 and lower support gasket 8 to carry out spacingly to the axial position and the circumference of case 3, guarantees that case 3 can not be in the axial float and the circumference rocking of valve body 1, can effectively protect seal assembly 5, prolongs seal assembly 5's life.
As shown in fig. 1 and 2, in the plug valve of one embodiment of the present invention, a double outer seal is provided. Specifically, the first O-ring 52 and the second O-ring 53 are first-stage external seals, and the inner cavity of the valve body 1 is sealed for the first stage by the circulating medium; the third O-ring 54 and the fourth hollow cylindrical ring 55 are second-stage external seals, and further, the medium flowing between the valve body 1 and the valve body 3 and between the valve body 3 and the valve seat 6 is sealed in the second stage.
The ethylene propylene diene monomer has excellent ultraviolet resistance, heat aging resistance, low temperature resistance, ozone resistance, chemical medium resistance, water resistance, good electrical insulation and elasticity, and the applicable temperature range is 50 ℃ below zero to 150 ℃. And among all rubbers, the ethylene propylene diene monomer has the lowest specific gravity, which is beneficial to light weight. The silicone rubber has good low temperature resistance and can still work at-55 ℃. The heat resistance of the silicone rubber is also outstanding, and the silicone rubber can work for a long time at 180 ℃. In addition, the valve body 1, the valve core 3 and the valve seat 6 are made of metal, so that the valve can be normally used in a wider working temperature range. In summary, the plug valve provided by the embodiment of the invention has good high-temperature and low-temperature resistance, and can be suitable for various mechanical environments such as ground installation, launching lift, space on orbit, returning to earth along with a spacecraft and the like in the aerospace field.
Because a large hollow circular structure with a 90-degree cutting edge is formed between the first through hole 13a and the cylindrical inner wall 1a of the valve body 1, when the handle 2 is mishandled and the side provided with the inner sealing member 51 is turned to the side of the first through hole 13a, the inner sealing member 51 is scratched by the cutting edge of the large hollow circular structure, so that the plug valve of one embodiment of the invention loses the inner sealing performance, and can cause leakage of oxygen in an oxygen supply system and possibly cause safety accidents. Therefore, the first U-shaped groove 91 and the second U-shaped groove 92 are formed at the upper end of the valve body 1 and are matched with the first limiting block 93 and the second limiting block 94 at the lower end of the handle 2, so that the movement of the handle 2 is limited to rotate within the range of 90 degrees. Ensuring that the handle 2 can only rotate within a limited range of 90 deg. avoids the inner seal 51 being damaged. While allowing the handle 2 to precisely locate the position of the plug valve for communication and closure.
When the first and second stoppers 93 and 94 rotate in the first and second U-shaped grooves 91 and 92, a downward pressure needs to be applied to the handle 2 to balance with the elastic force of the handle spring 95. When the handle 2 rotates to the open or closed position, the handle 2 is released, and at this time, the handle spring 95 gives an upward elastic force to the handle 2, so that the first and second stoppers 93 and 94 of the handle 2 enter the vertical openings of the first and second U-shaped grooves 91 and 92 and are limited to be located only at the openings of the first and second U-shaped grooves 91 and 92.
According to the plug valve of the embodiment of the invention, the first U-shaped groove and the second U-shaped groove are formed in the upper end of the valve body 1 and are matched with the first limiting block 93 and the second limiting block 94 at the lower end of the handle 2, so that the rotation movement of the handle 2 is limited within the range of 90 degrees, the accurate positioning of the valve indication position can be ensured, and the misoperation of a astronaut can be effectively prevented.
The upper support gasket 7 and the lower support gasket 8 are used for limiting the axial direction of the valve core 3 and limiting the rotation center of the valve core 3, so that the rotation center of the valve core 3 is prevented from being deviated due to the single-side installation of the inner sealing piece 51 or the rotation center of the valve core 3 is prevented from being deviated due to the operation of the upper handle 2.
The valve seat 6 and the valve body 1 are in flange and thread connection, and the valve core 3 is supported by pressing the lower support gasket 8. The handle spring 95 acts between the valve body 1 and the handle 2 to provide resistance for pressing in the handle 2, and is matched with the first U-shaped groove on the valve body 1, and the second U-shaped groove limits the rotation angle of the valve core 3, so that false opening or false closing is prevented.
The handle 2 is in a straight shape, the top surface is in transition smooth curved surface, the rounding treatment is carried out, the requirements of manual grasping by human with human ergonomics are met, a large operation force arm can be provided, the manual operation is convenient, and the ergonomic design of the handle 2 is verified by the center of Chinese astronauts.
The handle 2 of the plug valve in one embodiment of the invention is in a shape of a straight line, and indicates that the plug valve is opened when the length direction of the handle 2 is parallel to the valve body 1, and indicates that the plug valve is closed when the length direction of the handle 2 is perpendicular to the valve body 1.
The plug valve of the embodiment of the invention not only can meet the performance requirements of gas circuit systems such as valve sealing, flow and the like, but also solves the interface forms of the valve body 1 and the valve core 3, meets the light weight reduction requirement, has the limiting component 9 for placing misoperation, and realizes space constraint.
A plug valve according to another embodiment of the present invention includes a valve body having a first installation opening 11, a medium inlet 12, and a medium outlet 13 having a medium outlet, a medium flow passage being formed between the medium inlet 12 and the medium outlet 13;
The lower end of the handle 2 is fixedly connected with the first mounting opening of the valve body in a rotatable manner;
The valve core 3 is arranged in the valve body, the upper part of the valve core 3 is a connecting rod part 31, the connecting rod part 31 is fixedly connected with the handle 2 in a synchronous rotation manner, the lower end of the valve core 3 is a cylindrical core part 33 which is matched with the cylindrical inner wall 1a of the valve body in a rotatable and tight contact manner, and a second through hole 33a penetrating through the outer surface of the cylinder is formed in the middle position of the cylindrical core part 33 of the valve core 3; when the plug valve is in an open state, two ends of the second through hole 33a are in medium communication with the medium inlet part 12 and the medium outlet part 13; the middle part of the valve core 3 is a cylindrical rod part 32;
the medium outlet is a first through hole 13a of the medium outlet 13 near one end of the valve core 3;
a dot matrix air hole 12a is arranged on the inlet end face of one end of the valve body medium inlet part 12, which is close to the valve core 3;
The outer circumferential surface of the cylindrical core 33 of the spool 3 is provided with a circular groove 33b, the diameter of the circular groove 33b is larger than that of the first through hole 13a, and the axis of the circular groove 33b coincides with the axis of the second through hole 33 a;
The sealing assembly 5, the sealing assembly 5 includes an inner sealing member 51, which is disposed between the inner wall of the valve body and the cylindrical surface of the valve core 3, and is fixedly accommodated in the circular groove 33 b.
The plug valve of another embodiment of the invention further comprises an upper support gasket 7 and a lower support gasket 8,
The outer surfaces of the upper support gasket 7 and the lower support gasket 8 are connected with the inner surface of the valve body in a close contact manner, so that the valve core is limited and positioned.
In the plug valve according to another embodiment of the present invention, the sealing assembly 5 further includes a first O-ring 52, a second O-ring 53, a third O-ring 54, and a fourth hollow cylindrical seal 55 for external sealing;
The first O-shaped sealing ring 52 and the second O-shaped sealing ring 53 are sleeved on the cylindrical core body and are divided into a part above and a part below the second through hole 33 a;
the third O-ring 54 is fitted over the upper portion of the first mounting opening 11 of the valve body,
Is located above the first O-ring 52;
The fourth hollow cylindrical sealing ring 55 is sleeved on the upper part of the valve seat 6, and is positioned between the outer circular surface of the upper part of the valve seat 6 and the inner surface of the second installation opening part 14.
In the plug valve according to another embodiment of the present invention, the first O-ring 52, the second O-ring 53, the third O-ring 54, and the fourth hollow cylindrical ring 55 for external sealing are silicone rubber O-rings; the inner seal 51 is an ethylene propylene diene monomer O-ring.
In the plug valve of another embodiment of the invention, the plug valve further comprises a limiting component 9; the limiting assembly 9 comprises a first U-shaped groove 91 and a second U-shaped groove 92 which are symmetrically arranged on the peripheral surface of the upper part of the valve body, and the openings of the first U-shaped groove 91 and the second U-shaped groove 92 start from the upper end surface of the valve body;
the handle is characterized by further comprising a first limiting block 93 and a second limiting block 94 which are matched with the first U-shaped groove 91 and the second U-shaped groove 92 are arranged at the lower part of the handle 2, and the first limiting block 93 and the second limiting block 94 are slidably arranged in the first U-shaped groove 91 and the second U-shaped groove.
In the plug valve according to another embodiment of the present invention, a locking nut 4 is further included, and a locking external thread is provided at an upper portion of the connecting rod portion 31, and the locking nut 4 is screwed on the locking external thread.
The limiting assembly 9 further comprises a handle spring 95, wherein the handle spring 95 is arranged between the lower part of the handle 2 and the upper part of the valve body, sleeved on the upper part of the cylindrical rod part 32 in the middle of the valve core 3, and kept in a compressed state.
According to another embodiment of the present invention, as shown in fig. 8, in the plug valve according to another embodiment of the present invention, the lattice type air holes 12a are uniformly distributed circular air holes having the same diameter, and the diameter of the lattice type air holes 12a is 1/6 of the diameter of the medium outlet. The ratio of the sum of the areas of the lattice-type air holes 12a to the area of the first through holes 13a is 40% -60%. The ventilation flow of the lattice type air holes 12a which are uniformly distributed can reach the range of 40% -60% of the ventilation flow of the first through holes 13a, and the requirements of the flow of the aerospace oxygen supply system are met while the inner sealing piece 51 is protected.
In the plug valve according to another embodiment of the present invention, the connecting rod portion 31 of the valve core 3 is a hexagonal cylinder and is fittingly inserted into the hexagonal hole of the handle 2.
In the plug valve of another embodiment of the invention, the upper end of the handle 2 is provided with a straight shape, the width-to-length ratio range is 1/3, and the plug valve has a smooth arc curved surface.
The foregoing is merely exemplary of specific embodiments of the invention, and it is to be understood that the invention may be embodied in other specific forms and arrangements of parts, which are not explicitly described herein, as such, may be implemented in general terms of apparatus and methods known in the art.
The above is only a specific embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A plug valve comprising a valve body (1), the valve body (1) having a first mounting opening (11), a medium inlet (12) and a medium outlet (13) having a medium outlet, the medium inlet (12) and the medium outlet (13) forming a medium flow channel therebetween;
The lower end of the handle (2) is fixedly connected with the first installation opening part (11) of the valve body (1) in a rotatable manner;
the valve core (3) is arranged in the valve body (1), the upper end of the valve core (3) is a connecting rod part (31), the connecting rod part (31) and the handle (2) can be synchronously and rotationally fixedly connected, the lower end of the valve core (3) is a cylindrical core part (33) which is rotationally and closely contacted with the cylindrical inner wall (1 a) of the valve body (1), and a second through hole (33 a) penetrating through the outer surface of the cylinder is formed in the middle position of the cylindrical core part (33) of the valve core (3); when the plug valve is in an open state, two ends of the second through hole (33 a) are in medium communication with the medium inlet part (12) and the medium outlet part (13); the middle part of the valve core (3) is a cylindrical rod part (32);
The medium outlet is a first through hole (13 a) at one end of the medium outlet (13) close to the valve core (3);
the valve is characterized in that a dot matrix air hole (12 a) is arranged on the inlet end face of the medium inlet part (12) of the valve body (1) close to one end of the valve core (3), and the diameter of the dot matrix air hole (12 a) is smaller than that of the first through hole (13 a);
an outer circumferential surface of a cylindrical core (33) of the valve element (3) is provided with a circular groove (33 b), the diameter of the circular groove (33 b) is larger than that of the first through hole (13 a), and the axis of the circular groove (33 b) coincides with the axis of the second through hole (33 a);
The sealing assembly (5) comprises an inner sealing piece (51) which is arranged between the inner wall of the valve body (1) and the cylindrical surface of the valve core (3) and fixedly accommodated in the circular groove (33 b);
The valve body (1) further comprises a second installation opening part (14) coaxially arranged with the first installation opening part (11), and the second installation opening part (14) is fixedly provided with a valve seat (6);
The sealing assembly (5) further comprises a first O-shaped sealing ring (52), a second O-shaped sealing ring (53), a third O-shaped sealing ring (54) and a fourth hollow cylindrical sealing ring (55) for external sealing;
The first O-shaped sealing ring (52) and the second O-shaped sealing ring (53) are sleeved on the cylindrical core part (33) and are respectively positioned above and below the second through hole (33 a);
the third O-shaped sealing ring (54) is embedded in the upper part of the first installation opening part (11) of the valve body (1) and is positioned above the first O-shaped sealing ring (52);
The fourth hollow cylindrical sealing ring (55) is sleeved on the upper portion of the valve seat (6) and is positioned between the outer circular surface of the upper portion of the valve seat (6) and the inner surface of the second installation opening (14).
2. Plug valve according to claim 1, characterized in that the lattice air holes (12 a) are uniformly distributed circular air holes of the same diameter, the lattice air holes (12 a) having a diameter of 1/4-1/6 of the diameter of the medium outlet; the ratio of the sum of the areas of the lattice-type air holes (12 a) to the area of the first through holes (13 a) is more than 45%.
3. Plug valve according to claim 2, characterized in that the handle (2) is provided with a polygonal hole in the upper central position, and the connecting rod part (31) of the valve core (3) is a polygonal cylinder, which can be fittingly inserted into the polygonal hole of the handle (2).
4. A plug valve according to claim 3, wherein a square hole is provided at the upper center of the handle (2), the connecting rod portion (31) of the valve core (3) is a square cylinder, which is fittingly inserted into the square hole of the handle (2), or the connecting rod portion (31) of the valve core (3) is a triangular cylinder, which is fittingly inserted into the triangular hole of the handle (2), or the connecting rod portion (31) of the valve core (3) is a hexagonal cylinder, which is fittingly inserted into the hexagonal hole of the handle (2).
5. Plug valve according to claim 4, further comprising an upper support spacer (7) and a lower support spacer (8),
The upper support gasket (7) is arranged between the upper end face of the cylindrical core (33) and the valve body (1) and sleeved on the upper part of the valve core (3); the outer circle surface of the upper supporting gasket (7) is tightly contacted with the surface of the cylindrical inner wall (1 a) of the valve body (1); the inner hole surface of the upper supporting gasket (7) is tightly contacted with the outer circle surface of the lower part of the cylindrical rod part (32); the upper side surface of the upper support gasket (7) is tightly contacted with the upper surface of the cylindrical inner wall (1 a) of the valve body (1); the lower side surface of the upper support pad (7) is in close contact with the upper surface of the cylindrical core (33);
The lower support gasket (8) is arranged between the lower end face of the cylindrical core part (33) and the valve body (1) and sleeved at the lower part of the cylindrical core part (33); the outer circle surface of the lower support gasket (8) is tightly contacted with the surface of the cylindrical inner wall (1 a) of the valve body (1); the inner hole surface of the lower support pad (8) is tightly contacted with the outer circle surface of the lower part of the cylindrical core part (33); the upper side surface of the lower support gasket (8) is tightly contacted with the lower surface of the cylindrical core (33) of the valve core (3); the lower side surface of the lower supporting gasket (8) is tightly contacted with the upper surface of the valve seat (6).
6. The plug valve of claim 5, wherein the plug valve is configured to,
The first O-shaped sealing ring (52), the second O-shaped sealing ring (53), the third O-shaped sealing ring (54) and the fourth hollow cylindrical sealing ring (55) for external sealing are silicon rubber O-shaped sealing rings; the inner sealing piece (51) is an ethylene propylene diene monomer O-shaped sealing ring.
7. Plug valve according to claim 6, further comprising a stop assembly (9); the limiting assembly (9) comprises a first U-shaped groove (91) and a second U-shaped groove (92) which are symmetrically arranged on the peripheral surface of the upper part of the valve body (1), and openings of the first U-shaped groove (91) and the second U-shaped groove (92) start from the upper end surface of the valve body (1);
The novel handle is characterized by further comprising a first limiting block (93) and a second limiting block (94) which are matched with the first U-shaped groove (91) and the second U-shaped groove (92) are arranged at the lower part of the handle (2), and the first limiting block (93) and the second limiting block (94) are slidably arranged in the first U-shaped groove (91) and the second U-shaped groove.
8. Plug valve according to claim 7, further comprising a lock nut (4) provided with a locking external thread on an upper portion of the connecting rod portion (31), the lock nut (4) being screwed on the locking external thread;
The limiting assembly (9) further comprises a handle spring (95), the handle spring (95) is arranged between the lower portion of the handle (2) and the upper portion of the valve body (1), is sleeved on the upper portion of the cylindrical rod portion (32) in the middle of the valve core (3), and is kept in a compressed state.
9. The plug valve of claim 8, wherein the plug valve is configured to,
The upper end of the handle (2) is provided with a straight shape, the width-to-length ratio range is 1/3-1/4, and the handle has a smooth arc curved surface.
CN202111302112.9A 2021-11-04 2021-11-04 Plug valve Active CN114183554B (en)

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CN115306920B (en) * 2022-07-08 2024-05-31 江苏华太电力仪表有限公司 Valve for strenghthened type low temperature oxygen

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CN109027296A (en) * 2018-09-11 2018-12-18 山东沃克控制阀有限公司 A kind of high pressure anti-cavitation cutting ball valve for capableing of noise reduction

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