CN114183554A - Plug valve - Google Patents

Plug valve Download PDF

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Publication number
CN114183554A
CN114183554A CN202111302112.9A CN202111302112A CN114183554A CN 114183554 A CN114183554 A CN 114183554A CN 202111302112 A CN202111302112 A CN 202111302112A CN 114183554 A CN114183554 A CN 114183554A
Authority
CN
China
Prior art keywords
valve
valve body
handle
cylindrical
core
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.)
Pending
Application number
CN202111302112.9A
Other languages
Chinese (zh)
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/CN114183554A/en
Publication of CN114183554A publication Critical patent/CN114183554A/en
Pending legal-status Critical Current

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    • 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)
  • 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 and 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 a cylinder is arranged in the middle of the cylindrical core part of the valve core; a dot matrix type air hole is formed in the inlet end face of one end, close to the valve core, of the valve body medium inlet part; the sealing assembly comprises an inner sealing element, an axis of the inner sealing element coincides with the second through hole, the inner sealing element is arranged between the inner wall of the valve body and the cylindrical surface of the valve core cylinder, and the sealing assembly further comprises a valve seat and a limiting assembly. The plug valve provided by the invention has good sealing performance and switching reliability, can be operated by using a small rotating torque, is comfortable and simple to operate, and can meet the requirement of bidirectional flow cut-off of a working medium.

Description

Plug valve
Technical Field
The invention relates to the technical field of valves, in particular to a plug valve of an oxygen supply system in the field of aerospace.
Background
The oxygen supply system is used as an important component in the environment-control and biological protection subsystem of the space station, and mainly has the functions of ensuring the 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 needs to adapt to various mechanical environments such as ground installation, launching, space on-orbit, earth return along with the spacecraft and the like, and needs to meet the requirements of being capable of adapting to different media, adapting to the temperature of the medium with large temperature difference and the like. The plug valve of the oxygen supply system of the space station is manually operated, so that not only is good sealing performance and switching reliability required, but also the press-in force and the rotating torque of the valve are required to be 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 Chinese invention patent CN 112413158A discloses a plug valve in a CO2 air conditioning system, which comprises a hollow valve body, wherein a throttling column with a through hole is arranged in the valve body, and the plug valve is characterized in that the throttling column is arranged in the inner cavity of the valve body in a floating way, an expansion groove is arranged on the throttling column, cylindrical surface sealing parts are symmetrically arranged at the left side and the right side of the throttling column, and contact surfaces matched with the appearance of the throttling column are arranged on the cylindrical surface sealing parts to form hard sealing together; the inner cavity of the valve body is also provided with a flow guide pipe, a conical surface annular gasket, a disc spring and a blocking cover which are positioned at the left side and the right side of the cylindrical surface sealing element, one end of the flow guide pipe is hermetically supported on the cylindrical surface sealing element, the other end of the flow guide pipe is hermetically supported on the blocking cover, the conical surface annular gasket is sleeved on the flow guide pipe, the disc spring is sleeved on the flow guide pipe, and the blocking cover tightly holds the cylindrical surface sealing element to the throttling cylinder to form sealing through compressing the disc spring. In the plug valve in the prior art, although bidirectional flow can be realized under the working condition of large temperature fluctuation, the structure is complex, a large rotating torque is required for operation due to the existence of hard seal, the parts are various, the weight is heavy, the characteristics of light weight are not realized, and the requirement of light weight in the aerospace field is not met.
Disclosure of Invention
The invention aims to provide a light-weight plug valve which has good sealing performance and switching reliability, can be operated by using a small rotating torque, is comfortable and convenient to operate and can meet the requirement of bidirectional flow cut-off of a working medium.
The plug valve comprises a valve body, a plug valve body and a plug valve, wherein the valve body is provided with a first mounting 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 rotatably and fixedly connected with the first mounting opening of the valve body;
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 and the handle can be fixedly connected in a synchronous rotating mode, the lower end of the valve core is a cylindrical core part and is matched with the cylindrical inner wall of the valve body in a rotating and close contact mode, 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 type air hole is formed in the inlet end face of one end, close to the valve core, of the valve body medium inlet part;
a circular groove is formed in the outer circumferential surface of the cylindrical core of the valve core, the diameter of the circular groove is larger than that of the first through hole, and the axis of the circular groove is overlapped with that of the second through hole;
and the sealing assembly comprises an inner sealing element which 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 the rotation process and smaller required rotation moment.
In the concept of the invention, it is important that the sealing assembly is not damaged when the valve element is secured for rotation in the valve body to open or close the medium passage. The sealing assembly is divided into an inner sealing piece and an O-shaped sealing ring, the inner sealing piece is used for inner sealing, when the inner sealing piece is damaged, a medium can be leaked into the inner cavity of the valve body, and the O-shaped sealing ring blocked by the outer sealing piece cannot be leaked outside the valve body. Therefore, the plug valve related to the invention has the advantages that the good sealing performance of the inner seal and the outer seal is very important.
Unlike the conventional installation mode of sleeving the sealing element on the valve core, the inner sealing element of the plug valve is arranged on the outer surface of the cylindrical core part of the valve core, and 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. And the inner sealing piece is fixedly arranged in the circular groove, and when the valve core rotates to the connection position, the inner sealing piece is positioned at the peripheral position of the dot matrix type air hole arranged on the inlet end surface, so that the medium is ensured to flow out from the medium outlet part of the valve body from the medium inlet part of the valve body through the second through hole of the valve core or flow out from the medium inlet part of the valve body from the medium outlet part of the valve body through the second through hole of the valve core.
The medium outlet part is communicated with the inner cavity of the valve body through a first through hole medium of a large-diameter outlet, the part of the inner cavity of the valve body, which is connected with the first through hole of the large-diameter outlet, is of a larger space hollow circular structure, and the larger space hollow circular 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 holes which are uniformly distributed on the inlet end face and are small-diameter air holes. The part of the valve body inner cavity connected with the dot-matrix type air hole is the inlet end face with a space mesh screen structure. Although the part of each small-diameter air hole connected with the inlet end face is still a small space hollow circular structure with a cutting edge, the small space hollow circular structure cannot damage the whole cylindrical inner wall of the inlet end face greatly due to the small diameter. When the handle is rotated to drive the valve core to rotate in the valve body to open or close a medium circulation channel, the inner sealing element and the inlet end face do not have large cutting force on the inner sealing element due to the cutting edge of the smaller space hollow circular structure although dynamic friction force exists in the rotation process, 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 element can surround the inlet end face in a sealing range of the inner sealing element, and therefore the inner sealing effect on a circulating medium can be well achieved.
In the plug valve of the present invention, the medium can flow in both directions. In other words, in the open state of the plug valve according to the present invention, the medium can flow from the medium inlet portion to the medium outlet portion in the forward direction. It is also possible to flow in reverse from the medium outlet portion to the medium inlet portion. A forward pressure when flowing from the media outlet to the media inlet is less than a reverse pressure when flowing from the media outlet to the media inlet. The media inlet portion and the media outlet portion in the present invention are merely descriptive names and should not be construed as limiting the present invention.
According to one aspect of the invention, the lattice air holes are uniformly distributed circular air holes with the same diameter, and the diameter of the lattice air holes is 1/4-1/6 of the diameter of the medium outlet. The ratio of the sum of the areas of the dot matrix type air holes to the area of the first through hole is more than 45%. The ventilation flow of the plurality of uniformly distributed dot-matrix air holes can reach more than 45% of the ventilation flow of the first through holes, and the requirement of the flow of an oxygen supply system for space flight and aviation is met while the inner sealing element is protected.
According to one aspect of the present invention, a polygonal hole is formed at a central position of an upper portion of the handle, and the connection rod portion of the valve core is a polygonal cylinder and fittingly inserted into the polygonal hole of the handle.
Through the simple matching of the appearance of the valve core connecting rod part and the polygonal inner hole of the handle, the synchronous rotation between the handle and the valve core can be realized, the number of parts for realizing rotation is reduced, and the light weight is realized.
According to an aspect of the present invention, a square hole is disposed at a central position of an upper portion of the handle, the connection rod portion of the valve element is a square cylinder and is fittingly inserted into the square hole of the handle, or the connection rod portion of the valve element is a triangular cylinder and is fittingly inserted into the triangular hole of the handle, or the connection rod portion of the valve element is a hexagonal cylinder and is fittingly inserted into the hexagonal hole of the handle.
When the rotation is realized by the triangular or quadrangular matching, the rotation is reliable, and the rotation moment is further reduced; when the rotation is realized by matching the six-shaped appearance, the weight of the handle and the valve core is further reduced while the reliable rotation is realized, and the realization of the light weight of the plug valve related to the invention 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 supporting gasket is arranged between the upper end surface of the cylindrical core part and the valve body and sleeved on the upper part of the valve core; the outer circle surface of the upper support gasket is in close contact with the surface of the cylindrical inner wall of the valve body; the surface of the inner hole of the upper support gasket is in close contact with the surface of the outer circle of the lower part of the cylindrical rod part; the upper side surface of the upper support gasket is in close contact with the upper surface of the cylindrical inner wall of the valve body; the lower side surface of the upper support spacer is in close contact with the upper surface of the cylindrical core;
the lower support gasket is arranged between the lower end surface of the cylindrical core part and the valve body and sleeved at the lower part of the cylindrical core part; the outer circle surface of the lower support gasket is in close contact with the surface of the cylindrical inner wall of the valve body; the surface of the inner hole of the lower support gasket is tightly contacted with the surface of the outer circle of the lower part of the cylindrical core part; the upper side surface of the lower support gasket is in close contact with the lower surface of the cylindrical core part of the valve core; the lower side surface of the lower support gasket is in close contact with the upper surface of the valve seat;
because the inner seal is located on 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, and if the valve core is not circumferentially supported and limited, the problem that the coaxiality of the valve core is out of tolerance when the valve core is installed in the valve body can be caused, so that the valve core and the sealing assembly are abraded in use, and the service life of the plug valve is shortened. In order to avoid the problem of the eccentric installation of the valve core and the valve body, according to the idea of the invention, the second installation opening part which is coaxially arranged with the first installation opening part is firstly arranged at the lower part of the valve body, and the coaxial rotation of the valve core and the valve body is ensured by the machining precision. The upper supporting gasket and the lower supporting gasket are arranged at a cavity between the valve core and the valve body in a tightly-fitted manner, and the upper supporting gasket and the lower supporting gasket are utilized to limit the axial position and the circumferential direction of the valve core, so that the valve core is prevented from axially shifting and circumferentially shaking in the valve body, a sealing assembly can be effectively protected, and the service life of the sealing assembly is prolonged.
According to one aspect of the invention, the seal assembly further comprises a first O-ring, a second O-ring, a third O-ring and a fourth hollow cylindrical seal 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 positioned above and below the second through hole;
the third O-shaped sealing ring is embedded in the upper part of the first mounting 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 portion of the valve seat and located between the outer circle surface of the upper portion of the valve seat and the inner surface of the second installation opening portion.
In the plug valve according to the invention, a double outer seal is provided. Specifically, the first O-ring and the second O-ring are first-stage outer seals, and first-stage seals are performed on circulating media in the inner cavity of the valve body; the third O-shaped sealing ring and the fourth hollow cylindrical sealing ring are second-stage external sealing, and further, second-stage sealing is performed on circulating media between the upper part between the valve body and the valve core and between the valve core and the valve seat.
According to an aspect of the present invention, the first O-ring, the second O-ring, the third O-ring and the fourth hollow cylindrical seal ring for external sealing are silicone rubber O-rings; the inner sealing element is an ethylene propylene diene monomer rubber O-shaped sealing ring.
The ethylene propylene diene monomer rubber has excellent ultraviolet resistance, heat aging resistance, low temperature resistance, ozone resistance, chemical medium resistance, water resistance, good electrical insulation and elasticity, and is applicable to the temperature range of minus 50 ℃ to minus 150 ℃. And among all rubbers, the ethylene propylene diene monomer has the lowest specific gravity, which is beneficial to light weight. The silicon rubber has good low-temperature resistance and can still work at the temperature of minus 55 ℃. The silicone rubber has outstanding heat resistance and can work for a long time at 180 ℃. In addition, the valve body, the valve core and the valve seat are made of junmo metal, and can be normally used in a wider working temperature range. In conclusion, the plug valve related by the invention has better high temperature resistance and low temperature resistance, and can be suitable for various mechanical environments in the aerospace field, such as ground installation, launching and lifting, space on-orbit, earth return along with a spacecraft and the like.
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 outer peripheral surface of the upper part of the valve body, and the openings of the first U-shaped groove and the second U-shaped groove begin from the upper end surface of the valve body;
the handle is characterized in that 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 on the lower portion 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 circular 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 operated by mistake and one side provided with the inner sealing element is turned to one side of the first through hole, the inner sealing element can be scratched by the cutting edge of the larger space hollow circular structure, so that the plug valve related to the invention loses the inner sealing performance, oxygen of an oxygen supply system can be leaked, and safety accidents can be caused. Therefore, the first U-shaped groove and the second U-shaped groove are formed in the upper end of the valve body and matched with the first limiting block and the second limiting block at the lower end of the handle, so that the handle can rotate within a 90-degree range in a limited mode. Ensures that the handle can only rotate within a limited range of 90 DEG, avoiding said inner seal being damaged. And simultaneously, the handle can accurately position the communication and closing positions of the plug valve.
According to an aspect of the present invention, the plug valve further includes a locking nut having a locking external thread provided on 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, the handle spring is arranged between the lower portion of the handle and the upper portion of the valve body, sleeved on the upper portion of the cylindrical rod portion 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 needs to be applied to the handle, and the downward pressure is used for balancing with the elastic force of the handle spring. When the handle rotates to the opening or closing position, the handle is loosened, at the moment, 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 opening parts of the first U-shaped groove and the second U-shaped groove.
According to one aspect of the present invention, the upper end of the handle is provided in a shape of a straight line having a width to length ratio ranging from 1/3 to 1/4 and having a smooth curved surface;
the handle is in a shape of a straight line, the top surface of the handle is transited to a smooth curved surface, the handle is subjected to round corner treatment, the requirement of manual grasping of human-computer ergonomics is met, a larger operation force arm can be provided, manual operation is facilitated, and the ergonomic design of the handle passes the verification of the center of Chinese astronauts.
Compared with the prior art, the invention has the following remarkable beneficial effects:
the plug valve provided by the invention realizes bidirectional opening and closing of a circulating medium by matching the cylindrical inner wall of the valve body with the cylindrical core part of the valve core, and is sealed by a sealing mode of combining an elastic sealing ring with a hard metal wall, so that the plug valve can be operated by using a small rotating torque. Good sealing performance can be achieved through the inner seal and the double outer seal; the valve body, the valve core, the valve seat and the sealing assembly which are made of metal and have 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, being adaptive to the temperature of the medium with large temperature difference and the like. The reliability of the plug valve switch can be realized through the matching sliding of the first U-shaped groove, the second U-shaped groove, the first limiting block and the second limiting block and the matching of the handle and the handle spring, the switch operation is quick and accurate, and the misoperation can be effectively avoided. The handle is simple in rotating structure, is provided with the straight handle with excellent ergonomic effect, and is comfortable and convenient to operate. 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 launching 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 structural view of the valve core of a plug valve according to one embodiment of the present invention;
FIG. 3 is a schematic structural view of the valve body of a plug valve according to one embodiment of the present invention;
FIG. 4 is a cross-sectional view of the valve body of a plug valve of one embodiment of the present invention;
FIG. 5 is a cross-sectional view A-A of the valve body of the plug valve according to one embodiment of the present invention of FIG. 4;
FIG. 6 is a bottom view of the connected state of the plug valve of one embodiment of the present invention;
FIG. 7 is a partial cross-sectional view of the valve body in the off state of the plug valve of one embodiment of the present invention;
FIG. 8 is a schematic diagram of the configuration of the lattice holes of a plug valve according to one embodiment of the present invention;
FIG. 9 is a three-dimensional schematic view of a plug valve according to one embodiment of the present invention.
The reference numbers: 1-a valve body; 1 a-a cylindrical inner wall; 11-a first mounting opening; 12-a media inlet portion; 12 a-dot matrix pores; 13-a media outlet portion; 13 a-a first via; 14-a second mounting opening; 2-a handle; 3-a valve core; 31-connecting rod part; 32-a cylindrical rod portion; 33-a cylindrical core; 33 a-a second via; 33 b-circular trenches; 4-locking the nut; 5-a sealing component; 51-an inner seal; 52-first O-ring seal; 53-second O-ring seal; 54-third O-ring seal; 55-fourth hollow cylindrical sealing ring; 6-valve seat; 7-upper support spacers; 8-a lower support gasket; 9-a limiting component; 91-a first U-shaped groove; 92-a second U-shaped groove; 93-a first stopper; 94-a second stopper; 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 obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
The present invention is described in detail below with reference to the drawings and the detailed description, and the embodiments are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.
As shown in fig. 1, 2, 4, 8 and 9, a plug valve according to an embodiment of the present invention includes a valve body 1, the valve body 1 having a first installation opening portion 11, a medium inlet portion 12 and a medium outlet portion 13 having a medium outlet, a medium flow passage being formed between the medium inlet portion 12 and the medium outlet portion 13;
the lower end of the handle 2 is rotatably and fixedly connected with the first mounting opening of the valve body 1;
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 and the handle 2 can be fixedly connected in a synchronous rotating way, the lower end of the valve core 3 is a cylindrical core part 33 and can be matched with the cylindrical inner wall 1a of the valve body 1 in a rotatable and close contact way, and a second through hole 33a penetrating through the outer surface of the cylinder is arranged in the middle position of the cylindrical core part 33 of the valve core 3; when the plug valve is in an open state, both ends of the second through hole 33a are in medium communication with the medium inlet portion 12 and the medium outlet portion 13; the middle part of the valve core 3 is a cylindrical rod part 32;
the medium outlet is a first through hole 13a at one end of the medium outlet portion 13 close to the spool 3;
a lattice type air hole 12a is arranged on the inlet end face of one end of the valve body 1 medium inlet part 12 close to the valve core 3;
the outer circumferential surface of the cylindrical core part 33 of the valve core 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 is coincident with that of the second through hole 33 a;
and the sealing assembly 5 comprises an inner sealing element 51, is arranged 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 supporting gasket 7 and a lower supporting gasket 8,
the upper supporting gasket 7 is arranged between the upper end surface of the cylindrical core part 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 gasket 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 gasket 7 is in close contact 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 in close contact with the upper surface of the cylindrical inner wall 1a of the valve body 1; the lower side face of the upper support spacer 7 is in close contact with the upper surface of the cylindrical core 33;
the lower supporting gasket 8 is arranged between the lower end surface 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 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 spacer 8 is in close contact with the outer circumferential surface of the lower portion of the cylindrical core 33; the upper side surface of the lower support gasket 8 is in close contact with the lower surface of the cylindrical core part 33 of the valve core 3; the lower side surface of the lower support gasket 8 is in close contact with the upper surface of the valve seat 6;
in the plug valve of one embodiment of the present invention, as shown in fig. 8, the lattice type air holes 12a are uniformly distributed circular air holes with the same diameter, and the diameter of the lattice type air holes 12a is 1/4 of the outlet diameter of the medium. The ratio of the sum of the areas of the dot-matrix air holes 12a to the area of the first through hole 13a ranges from 40% to 60%. The ventilation flow of the plurality of uniformly distributed dot-matrix air holes 12a can reach 40% -60% of the ventilation flow of the first through holes 13a, and the requirement of the flow of the oxygen supply system for aerospace and aviation is met while the inner sealing element 51 is protected.
In the plug valve of one embodiment of the present invention, a square hole is provided at the center of the upper portion of the handle 2, and the connection rod portion 31 of the valve core 3 is a square column body and can be fittingly inserted into the square hole of the handle 2.
As shown in fig. 1, in the plug valve of an 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 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 body and are positioned above and below the second through hole 33 a;
a third O-ring 54 is fitted in the upper portion of the first mounting opening 11 of the valve body 1,
above the first O-ring seal 52;
the fourth hollow cylindrical seal ring 55 is fitted on the upper portion of the valve seat 6 and is located between the outer circumferential surface of the upper portion of the valve seat 6 and the inner surface of the second mounting opening 14.
In the plug valve according to the 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 seal ring 55 for external sealing are silicone rubber O-rings; the inner seal 51 is an ethylene propylene diene monomer rubber O-ring seal.
As shown in fig. 3, 5 and 6, the plug valve of one embodiment of the present invention further comprises 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 outer 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 begin 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 arranged on the lower portion of the handle 2 and matched with the first U-shaped groove 91 and the second U-shaped groove 92, wherein 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, the plug valve according to the embodiment of the present invention further includes a locking nut 4, wherein a locking male screw is provided at an upper portion of the connection rod portion 31, and the locking nut 4 is screwed on the locking male screw.
The limiting assembly 9 further comprises a handle spring 95, wherein 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 keeps a compression state.
As shown in fig. 6, in the plug valve according to the embodiment of the present invention, the upper end of the handle 2 is formed in a straight shape, has a width-to-length ratio in the range of 1/4, and has a smooth arc curved surface;
the plug valve of one embodiment of the invention is a two-position two-way structure, the valve body 1 is provided with a medium inlet part 12 and a medium outlet part 13, and the valve core 3 is provided with a second through hole 33 a. 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.
The plug valve of one embodiment of the invention drives the valve core 3 to rotate in the valve body 1 through the handle 2 to control the valve to be opened and closed, and the inlet end face is set to be a structure with a dot-matrix air hole 12a, so that the bidirectional flow stop function of the plug valve is realized, the plug valve can be applied to an oxygen path system of a space station environmental protection subsystem, and the structure expands the application range of the plug valve.
The plug valve of one embodiment of the invention can ensure that the sealing component 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 piece 51 for inner sealing and an O-shaped sealing ring for outer sealing, when the inner sealing piece 51 is damaged, a medium can be leaked into the inner cavity of the valve body 1, and the O-shaped sealing ring blocked by the outer sealing cannot be leaked to the outside of the valve body 1. Good sealing of both the inner and outer seals is critical to the plug valve of one embodiment of the present invention.
Unlike the conventional installation manner in which the sealing member is fitted over the valve element 3, the inner sealing 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 valve element 3, specifically, a circular groove 33b is provided on the outer circumferential surface of the valve element 3, and the axis of the circular groove 33b coincides with the axis of the second through hole 33 a. The inner seal 51 is fixedly disposed in the circular groove 33b, and when the valve body 3 is rotated to the on position, the inner seal 51 is located at a peripheral position of the inlet end surface where the dot matrix type air holes 12a are disposed, so that the medium is ensured to flow out from the medium outlet portion 13 of the valve body 1 through the second through hole 33a of the valve body 3 from the medium inlet portion 12 of the valve body 1, or flow out from the medium outlet portion 13 of the valve body 1 through the second through hole 33a of the valve body 3 from the medium inlet portion 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 the large-diameter outlet, the part of the inner cavity of the valve body 1, which is connected with the first through hole 13a of the large-diameter outlet, is of a larger space hollow circular structure, and the larger space hollow circular structure is positioned on the same cylindrical surface of the cylindrical inner wall 1a of the valve body 1 and is provided with a 90-degree cutting edge. The medium inlet part 12 is communicated with the inner cavity of the valve body 1 through a lattice type air hole 12a, and the lattice type air holes 12a are uniformly distributed on the inlet end face and are small-diameter air holes. The part of the inner cavity of the valve body 1 connected with the dot-matrix air hole 12a is an inlet end face with a space mesh screen structure. Although the part of each small-diameter air hole connected with the inlet end face is still in a small space hollow circular structure with a cutting edge, the small space hollow circular structure cannot damage the whole cylindrical inner wall of the inlet end face greatly due to the small diameter. When the handle 2 is rotated 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 do not have large cutting force to the inner sealing element 51 due to the fact that the cutting edge of the small space hollow circular structure has a dynamic friction force in the rotation process, the inner sealing element 51 is protected in the use process, and the service life of the plug valve of the embodiment of the invention is prolonged.
Because the diameter of the circular groove 33b is larger than that of the first through hole 13a, when the plug valve of one embodiment of the present invention is in the open state, the inner sealing member 51 can surround the inlet end face within its sealing range, thereby performing an inner sealing function on the medium flowing through.
In the plug valve according to the embodiment of the present invention, the medium can flow in both directions. That is, in the open state of the plug valve of one embodiment of the present invention, the medium may flow positively from the medium inlet portion 12 to the medium outlet portion 13. It is also possible to flow in reverse 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 the embodiment of the present invention, the medium inlet portion 12 and the medium outlet portion 13 are merely descriptive names and should not be construed as limiting the embodiment of the present invention.
In the plug valve of one embodiment of the invention, the simple matching of the square shape of the connecting rod part 31 of the valve core 3 and the square inner hole of the handle 2 can realize the synchronous rotation between the handle 2 and the valve core 3, reduce the number of parts for realizing rotation and realize light weight. When the rotation is realized by square matching, the rotation is reliable, and the rotation torque is further reduced;
as shown in fig. 7, since the inner seal 51 is located on one side of the circumference of the cylindrical core 33, and the surface is 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 portion 33 of the valve core 3, and if the valve core 3 is not circumferentially supported and limited, the problem of poor coaxiality of the valve core 3 in the valve body 1 may be caused. Thereby causing wear of the valve core 3 and the seal assembly 5 during use and reducing the service life of the plug valve. In order to avoid the problem of the eccentric mounting of the valve element 3 to the valve body 1, according to the concept of the present invention, first, the second mounting opening portion 14 provided coaxially with the first mounting opening portion 11 is provided at the lower portion of the valve body 1, and the coaxial rotation of the valve element 3 and the valve body 1 is secured by the machining accuracy. And at the cavity department between case 3 and valve body 1, set up support gasket 7 and bottom suspension gasket 8 closely with laminating, utilize support gasket 7 and bottom suspension gasket 8 to carry on spacingly to the axial position and the circumference of case 3, guarantee that case 3 can not rock axially in valve body 1 drunkenness and circumference, can effectively protect seal assembly 5, prolong seal assembly 5's life.
In one embodiment of the plug valve of the present invention, as shown in FIGS. 1 and 2, a double outer seal is provided. Specifically, the first O-ring 52 and the second O-ring 53 are first-stage external seals, and perform first-stage sealing on a medium flowing in the inner cavity of the valve body 1; the third O-ring 54 and the fourth hollow cylindrical seal ring 55 are second-stage external seals, and further perform second-stage sealing on the medium flowing between the upper portion between the valve body 1 and the valve core 3 and between the valve core 3 and the valve seat 6.
The ethylene propylene diene monomer rubber has excellent ultraviolet resistance, heat aging resistance, low temperature resistance, ozone resistance, chemical medium resistance, water resistance, good electrical insulation and elasticity, and is applicable to the temperature range of minus 50 ℃ to minus 150 ℃. And among all rubbers, the ethylene propylene diene monomer has the lowest specific gravity, which is beneficial to light weight. The silicon rubber has good low-temperature resistance and can still work at the temperature of minus 55 ℃. The silicone rubber has outstanding heat resistance and 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 junmo metal, and can be normally used in a wider working temperature range. In conclusion, the plug valve provided by the embodiment of the invention has better high-temperature resistance and low-temperature resistance, and can be suitable for various mechanical environments such as ground installation, launching and lifting, space on-orbit, return to the earth along with a spacecraft and the like in the field of aerospace.
Because a large space 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 operated by mistake 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 can be scratched by the cutting edge of the large space hollow circular structure, so that the plug valve of one embodiment of the invention loses the inner sealing performance, oxygen of an oxygen supply system can be leaked, and safety accidents can be caused. Therefore, the upper end of the valve body 1 is provided with the first U-shaped groove 91 and the second U-shaped groove 92 which 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 within the range of 90 degrees. Ensuring that the handle 2 can only be rotated within a limited 90 deg. range avoids damage to the inner seal 51. Meanwhile, the handle 2 can accurately position the communication and closing positions of the plug valve.
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 the elastic force of the handle spring 95. When the handle 2 is rotated to an 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 limit blocks 93 and 94 of the handle 2 enter the vertical opening portions of the first and second U-shaped grooves 91 and 92 and are limited to be located at the opening portions of the first and second U-shaped grooves 91 and 92.
According to the plug valve provided by the embodiment of the invention, the first U-shaped groove and the second U-shaped groove are formed at the upper end of the valve body 1 and 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 motion of the handle 2 is limited within a 90-degree range, the accurate positioning of the indicating position of the valve 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 installation of the inner sealing element 51 on one side 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 threaded connection, and the lower support gasket 8 is pressed to support the valve core 3. Handle spring 95 acts on between valve body 1 and the handle 2, provides the resistance for handle 2 impresses, and the first U-shaped groove on the cooperation valve body 1, second U-shaped groove restriction case 3 turned angle prevents to open by mistake or the mistake is closed.
The handle 2 is in a shape of a straight line, the top surface of the handle is transited to a smooth curved surface, the round corner treatment is carried out, the requirement of manual grasping of human-computer ergonomics is met, a larger operation force arm can be provided, the manual operation is convenient, and the ergonomic design of the handle 2 passes the verification of the center of Chinese astronauts.
The handle 2 of the plug valve is in a straight line shape, when the length direction of the handle 2 is parallel to the valve body 1, the plug valve is indicated to be opened, and when the length direction of the handle 2 is vertical to the valve body 1, the plug valve is indicated to be closed.
The plug valve provided by the embodiment of the invention can meet the performance requirements of gas circuit systems such as valve sealing, flow and the like, also solves the interface form of the valve body 1 and the valve core 3, meets the light weight reduction requirement, is provided with 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 mounting opening portion 11, a medium inlet portion 12, and a medium outlet portion 13 having a medium outlet, a medium flow passage being formed between the medium inlet portion 12 and the medium outlet portion 13;
the lower end of the handle 2 is rotatably and fixedly connected with the first mounting opening of the valve body;
the valve core 3 is arranged in the valve body, the upper part of the valve core 3 is provided with a connecting rod part 31, the connecting rod part 31 and the handle 2 can be fixedly connected in a synchronous rotating way, the lower end of the valve core 3 is provided with a cylindrical core part 33 which is matched with the cylindrical inner wall 1a of the valve body in a rotatable and close contact way, and the middle position of the cylindrical core part 33 of the valve core 3 is provided with a second through hole 33a penetrating through the outer surface of the cylinder; when the plug valve is in an open state, both ends of the second through hole 33a are in medium communication with the medium inlet portion 12 and the medium outlet portion 13; the middle part of the valve core 3 is a cylindrical rod part 32;
the medium outlet is a first through hole 13a at one end of the medium outlet portion 13 close to the spool 3;
a dot matrix type air hole 12a is arranged on the inlet end face of one end of the valve body medium inlet part 12 close to the valve core 3;
the outer circumferential surface of the cylindrical core part 33 of the valve core 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 is coincident with that of the second through hole 33 a;
and the sealing assembly 5 comprises an inner sealing element 51, is arranged 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 tight contact manner, and the valve core is limited and positioned.
In the plug valve of 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 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 body and are positioned above and below the second through hole 33 a;
a third O-ring seal 54 is fitted in the upper portion of the first mounting opening 11 of the valve body,
above the first O-ring seal 52;
the fourth hollow cylindrical seal ring 55 is fitted on the upper portion of the valve seat 6 and is located between the outer circumferential surface of the upper portion of the valve seat 6 and the inner surface of the second mounting opening 14.
In the plug valve of 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 silicon rubber O-rings; the inner seal 51 is an ethylene propylene diene monomer rubber O-ring seal.
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 outer 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 begin 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 arranged on the lower portion of the handle 2 and matched with the first U-shaped groove 91 and the second U-shaped groove 92, wherein 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 of another embodiment of the present invention, a locking nut 4 is further included, a locking external thread is provided on 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 portion of the handle 2 and the upper portion of the valve body, is sleeved on the upper portion of the cylindrical rod portion 32 in the middle of the valve core 3, and keeps a compressed state.
According to another embodiment of the present invention, as shown in fig. 8, in another embodiment of the plug valve of the present invention, the lattice type air holes 12a are uniformly distributed circular air holes with the same diameter, and the diameter of the lattice type air holes 12a is 1/6 which is the diameter of the medium outlet. The ratio of the sum of the areas of the dot-matrix air holes 12a to the area of the first through hole 13a is 40-60%. The ventilation flow rate of the plurality of uniformly distributed dot-matrix air holes 12a can reach the ventilation flow rate of the first through holes 13a within the range of 40% -60%, and the requirement of the flow rate of the aerospace oxygen supply system is met while the inner sealing element 51 is protected.
In the plug valve of 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 cock valve according to another embodiment of the present invention, the upper end of the handle 2 is formed in a straight shape having a width to length ratio in the range of 1/3 and has a smooth curved surface.
The foregoing is merely exemplary of particular aspects of the present invention and devices and structures not specifically described herein are understood to be implemented using conventional devices and methods known in the art.
The above description is only an embodiment of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A plug valve comprises a valve body (1), wherein the valve body (1) is provided with a first mounting opening part (11), a medium inlet part (12) and a medium outlet part (13) with a medium outlet, and a medium circulation channel is formed between the medium inlet part (12) and the medium outlet part (13);
a handle (2) having a lower end rotatably fixed to the first mounting opening (11) of the valve body (1);
the valve core (3) is arranged in the valve body (1), the upper end of the valve core (3) is provided with a connecting rod part (31), the connecting rod part (31) and the handle (2) can be synchronously and fixedly connected in a rotating way, the lower end of the valve core (3) is provided with a cylindrical core part (33) which is matched with the cylindrical inner wall (1a) of the valve body (1) in a rotating and tightly contacting way, and the middle position of the cylindrical core part (33) of the valve core (3) is provided with a second through hole (33a) penetrating through the outer surface of the cylinder; when the plug valve is in an open state, two ends of the second through hole (33a) can be 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) at one end of the medium outlet part (13) close to the valve core (3);
the valve is characterized in that a lattice type air hole (12a) is formed in the inlet end face of one end, close to the valve core (3), of the medium inlet part (12) of the valve body (1);
the outer circumferential surface of the cylindrical core part (33) of the valve core (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) is coincident with that of the second through hole (33 a);
the sealing assembly (5) comprises an inner sealing element (51) which is arranged 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).
2. The plug valve of claim 1, wherein said lattice gas holes (12a) are uniformly distributed circular holes of the same diameter, said lattice gas holes (12a) having a diameter of 1/4-1/6; the ratio of the sum of the areas of the dot-matrix air holes (12a) to the area of the first through hole (13a) is greater than 45%.
3. The plug valve according to claim 2, wherein a polygonal hole is formed at the center of the upper portion of the handle (2), and the connecting rod portion (31) of the valve body (3) is a polygonal cylinder and fittingly inserted into the polygonal hole of the handle (2).
4. The plug valve according to claim 3, wherein a square hole is formed at the center of the upper portion of the handle (2), the connecting rod portion (31) of the valve element (3) is a square cylinder and is fittingly inserted into the square hole of the handle (2), or the connecting rod portion (31) of the valve element (3) is a triangular cylinder and is fittingly inserted into the triangular hole of the handle (2), or the connecting rod portion (31) of the valve element (3) is a hexagonal cylinder and is fittingly inserted into the hexagonal hole of the handle (2).
5. A plug valve according to claim 4, characterized in that the valve body (1) further comprises a second mounting opening portion (14) provided coaxially with the first mounting opening portion (11), the second mounting opening portion (14) fixedly mounting a valve seat (6);
also comprises an upper supporting gasket (7) and a lower supporting gasket (8),
the upper supporting gasket (7) is arranged between the upper end surface of the cylindrical core part (33) and the valve body (1) and sleeved on the upper part of the valve core (3); the outer circle surface of the upper support gasket (7) is in close contact with the surface of the cylindrical inner wall (1a) of the valve body (1); the surface of an inner hole of the upper support gasket (7) is tightly contacted with the surface of an outer circle of the lower part of the cylindrical rod part (32); the upper side surface of the upper support gasket (7) is in close contact with the upper surface of the cylindrical inner wall (1a) of the valve body (1); the lower side face of the upper support spacer (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 on the lower part of the cylindrical core part (33); the outer circle surface of the lower supporting gasket (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 gasket (8) is in close contact with the outer circular surface of the lower part of the cylindrical core part (33); the upper side surface of the lower support gasket (8) is in close contact with the lower surface of the cylindrical core part (33) of the valve core (3); the lower side surface of the lower support gasket (8) is in close contact with the upper surface of the valve seat (6).
6. Plug valve according to claim 5, characterized in that said sealing assembly (5) further comprises a first O-ring (52), a second O-ring (53), a third O-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 body and are 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 mounting 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 located between the outer circle surface of the upper portion of the valve seat (6) and the inner surface of the second mounting opening portion (14).
7. The plug valve of claim 6,
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 element (51) is an ethylene propylene diene monomer rubber O-shaped sealing ring.
8. A plug valve according to claim 7, 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 outer 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) begin from the upper end surface of the valve body (1);
the handle is characterized in that 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 on the lower portion 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.
9. The plug valve according to claim 8, further comprising a locking nut (4) having a locking male screw provided on an upper portion of the connection rod portion (31), the locking nut (4) being screwed on the locking male screw;
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), sleeved on the upper portion of the cylindrical rod portion (32) in the middle of the valve core (3) and kept in a compressed state.
10. The plug valve of claim 9,
the upper end of the handle (2) is arranged in a straight shape, the width-length ratio range is 1/3-1/4, and the handle is provided with a smooth arc curved surface.
CN202111302112.9A 2021-11-04 2021-11-04 Plug valve Pending CN114183554A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115306920A (en) * 2022-07-08 2022-11-08 江苏华太电力仪表有限公司 Valve for strenghthened type low temperature oxygen

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW444836U (en) * 2000-08-31 2001-07-01 Wang Jia Ming Improved flow regulating ball valve
US20060202149A1 (en) * 2003-11-14 2006-09-14 Muddiman G R Cylindrical plug valve
CN106134408B (en) * 2011-07-21 2014-08-27 北京卫星制造厂 A kind of manual plug valve of long handle self-centering that is applicable to space flight air-channel system
CN204647398U (en) * 2015-05-25 2015-09-16 天津瑞诚科技有限公司 A kind of constant current constant voltage water flow valve
EP3115668A1 (en) * 2015-07-10 2017-01-11 Azbil Corporation Regulating valve
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

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW444836U (en) * 2000-08-31 2001-07-01 Wang Jia Ming Improved flow regulating ball valve
US20060202149A1 (en) * 2003-11-14 2006-09-14 Muddiman G R Cylindrical plug valve
CN106134408B (en) * 2011-07-21 2014-08-27 北京卫星制造厂 A kind of manual plug valve of long handle self-centering that is applicable to space flight air-channel system
CN204647398U (en) * 2015-05-25 2015-09-16 天津瑞诚科技有限公司 A kind of constant current constant voltage water flow valve
EP3115668A1 (en) * 2015-07-10 2017-01-11 Azbil Corporation Regulating valve
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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115306920A (en) * 2022-07-08 2022-11-08 江苏华太电力仪表有限公司 Valve for strenghthened type low temperature oxygen
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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