CN111609148A - Ultralow-temperature pneumatic stop valve - Google Patents
Ultralow-temperature pneumatic stop valve Download PDFInfo
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- CN111609148A CN111609148A CN202010413201.XA CN202010413201A CN111609148A CN 111609148 A CN111609148 A CN 111609148A CN 202010413201 A CN202010413201 A CN 202010413201A CN 111609148 A CN111609148 A CN 111609148A
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- valve
- piston
- valve core
- valve body
- corrugated pipe
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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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
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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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
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- 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
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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
- F16K41/00—Spindle sealings
- F16K41/10—Spindle sealings with diaphragm, e.g. shaped as bellows or tube
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
Abstract
The invention discloses an ultralow temperature pneumatic stop valve, which comprises a valve body, a valve core assembly and a corrugated pipe assembly, wherein the valve core assembly and the corrugated pipe assembly are arranged in an inner cavity channel of the valve body; the bottom of the corrugated pipe assembly is detachably and fixedly connected with the valve core assembly, one end of a valve core in the valve core assembly is provided with a valve core block, one end of the valve core in the opposite axial direction is provided with an inner hole, the bottom of a valve rod of the corrugated pipe assembly is inserted into the inner hole, the top of the valve rod and the top of the corrugated pipe are sleeved in a valve seat, and the valve seat is clamped on an interface surface of the valve body; the top of the corrugated pipe assembly is fixedly connected with the actuating mechanism in a detachable mode, a connecting rod at the bottom of the piston penetrates through the piston cylinder and is connected with the valve rod, the piston arranged in the piston cylinder divides the piston into two sealing cavities, valve opening and closing are achieved through inflation and deflation of control gas corresponding to each sealing cavity, and the valve opening and closing device can be suitable for working conditions with the pressure of (3-15) MPa and the drift diameter of (15-50) mm.
Description
Technical Field
The invention belongs to the technical field of valves, and relates to an ultralow-temperature pneumatic stop valve.
Background
The existing pneumatic stop valve products have various forms of normal temperature type, high temperature type and low temperature type. In an ultralow temperature environment (the temperature is less than or equal to minus 101 ℃), an ultralow temperature stop valve is needed when ultralow temperature media are transmitted. The ultralow temperature stop valve is a stop device applied to low temperature working conditions, and generally plays an important role in the industrial field of low temperature industry with the working temperature below-101 ℃.
The ultralow temperature stop valve has the characteristics of compact structure, reasonable design, good valve rigidity, smooth channel, long service life, reliable sealing, flexible operation and the like. The device is suitable for LNG, LO2, LN2, LAr, ultralow temperature pipelines, running equipment and the like, and is used for cutting off or connecting media in the pipelines.
With the development of the technology, the pipeline systems for transporting, storing and using media such as liquid oxygen, liquid nitrogen, LNG and the like are gradually intelligentized, valves required by a control switch are gradually replaced by low-temperature manual valves through low-temperature pneumatic stop valves, but in the prior art, the low-temperature pneumatic stop valves with the pressure of more than 3MPa, the drift diameter of more than 15mm and high reliability are fewer.
Disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides an ultralow-temperature pneumatic stop valve which sequentially comprises a valve body, a valve core assembly, a corrugated pipe assembly and a pneumatic actuating mechanism from bottom to top. The piston arranged in the piston cylinder in the actuating mechanism divides the piston cylinder into two sealed cavities which are respectively communicated with the used air ports, and the valve is switched by controlling the air charging and discharging of air through the air ports.
In order to achieve the aim, the invention discloses an ultralow temperature pneumatic stop valve which comprises a valve body, a valve core assembly and a corrugated pipe assembly, wherein the valve core assembly and the corrugated pipe assembly are arranged in an inner cavity channel of the valve body;
the bottom of the corrugated pipe assembly is detachably and fixedly connected with the valve core assembly, one end of a valve core in the valve core assembly is provided with a valve core block, one end of the valve core in the opposite axial direction is provided with an inner hole, the bottom of a valve rod of the corrugated pipe assembly is inserted into the inner hole, the top of the valve rod and the top of the corrugated pipe are sleeved in a valve seat, and the valve seat is clamped on an interface surface of the valve body;
the top of the corrugated pipe assembly is fixedly connected with an actuating mechanism in a detachable mode, a connecting rod at the bottom of a piston penetrates through a piston cylinder and is connected with the valve rod, the piston cylinder is fixedly connected with the valve seat and the valve body respectively, the piston is divided into two sealing cavities by a piston arranged in the piston cylinder, a first sealing cavity MFQ I is formed at the bottom of the piston and the piston cavity and is communicated with a control air port B, a second sealing cavity MFQ II is formed between the piston and a piston cover and is communicated with the control air port A, and valve opening and closing are achieved through charging and discharging of control air in A and B.
Furthermore, a self-pressurizing sealing element for sealing is arranged between the piston and the piston cylinder and comprises a plurality of groups of second spring retainer rings, a third retainer ring and a third universal plug seal, wherein a third universal plug seal lip mouth faces towards the piston head and the piston connecting rod respectively.
Furthermore, the connecting rod of the piston and the piston cylinder are sealed through a first spring retainer ring, a second universal plug seal and a supporting retainer ring, wherein the lip of the second universal plug seal faces to the direction of a medium.
Furthermore, the control air port A is arranged on the piston cover and is communicated with the second sealing cavity MFQI; the bottom of the piston cylinder is provided with a guide air hole communicated with the joint, and the control air hole A is arranged on the joint and communicated with the first sealing cavity MFQ I.
Furthermore, the valve seat and the valve body are provided with a first retainer ring, a first flooding plug seal and a combined support ring in the radial direction, so that the valve seat and the valve body form a radial self-pressurization sealing structure.
Further, the valve seat with valve body axial direction is equipped with first sealed the pad, just first sealed pad is located in the mounting groove on the valve body.
Furthermore, the valve rod extends into a valve rod spherical groove QXC II arranged in the valve core, the valve rod spherical groove QXC II and the valve core spherical groove QXC I form a complete spherical groove, and a plurality of steel balls are filled in the complete spherical groove.
Furthermore, a threaded passage LWTD is arranged in the inner hole in the radial direction of the inner hole of the valve core spherical groove for installing the steel ball, and a set screw is arranged in the threaded passage LWTD.
Further, the outer portion of the valve seat is provided with a valve seat spring positioning shaft THDWZ II, a radial sealing surface JXMFM, a positioning surface DWM I2 and an axial pressing table ZXYT, wherein the outer diameter of the valve seat spring positioning shaft THDWZ II, the radial sealing surface JXMFM, the positioning surface DWM I2 and the valve body are positioned on the valve seat, and the axial pressing table ZXYT is pressed on the top of the valve body.
And the spring is axially arranged between the valve core assembly and the valve seat and radially arranged outside the valve seat spring positioning shaft THDWZ II and the valve core spring positioning shaft THDWZ I.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
(1) the invention discloses an ultralow temperature pneumatic stop valve which sequentially comprises a valve body, a valve core assembly, a corrugated pipe assembly and a pneumatic actuating mechanism from bottom to top. The corrugated pipe assembly and the valve core assembly are installed in the inner cavity of the valve body after being assembled, and the valve seat is clamped on the interface surface of the valve body; the bottom of the corrugated pipe assembly is fixedly connected with the valve core assembly in a detachable mode, the top of the corrugated pipe assembly is fixedly connected with the actuating mechanism in a detachable mode, a piston arranged in the piston cylinder in the actuating mechanism divides the piston cylinder into two sealing cavities which are respectively communicated with the corresponding air ports, and the valve switch is achieved by controlling the air charging and discharging of air through the air ports.
(2) According to the ultralow temperature pneumatic stop valve, firstly, a sealing element for self-pressurization sealing is arranged between the piston and the piston cylinder, secondly, a sealing assembly is arranged between the connecting rod of the piston and the piston cylinder, and in addition, a radial sealing structure and an axial sealing structure are arranged between the valve body and the valve seat for combined sealing, so that the ultralow temperature medium static sealing is ensured, and the self-pressurization sealing structure solves the problem of controlling pneumatic low temperature dynamic sealing.
(3) According to the ultralow temperature pneumatic stop valve, the piston cylinder of the pneumatic actuating mechanism is pressed on the valve seat, the piston cylinder is connected with the valve body through the uniformly distributed screws to tightly press the valve seat, the piston of the pneumatic actuating mechanism is connected with the valve rod of the corrugated pipe assembly through threads, linkage is realized, and the problem of the reliability of the motion dynamic seal of the ultralow temperature medium valve rod is solved through the application of the corrugated pipe assembly.
(4) The ultralow temperature pneumatic stop valve disclosed by the invention is compact in structure and light in weight through overall structure optimization, positioning design, steel ball connection and the like.
(5) Tests show that the ultralow-temperature pneumatic stop valve can be suitable for working conditions with the pressure of 3-15 MPa and the drift diameter of 15-50 mm, has smaller volume and lighter weight than like products, and has the advantages of compact structure, reliable sealing, light weight, convenience in assembly and maintenance and the like.
Drawings
FIG. 1 is a schematic cross-sectional view of the whole structure of an ultra-low temperature pneumatic stop valve according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a valve core assembly of an ultralow temperature pneumatic stop valve according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an ultra-low temperature pneumatic stop valve bellows assembly according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a pneumatic actuator of an ultra-low temperature pneumatic stop valve according to an embodiment of the present invention;
FIG. 5 is a top view of a connection structure of a valve core assembly and a bellows assembly of the ultra-low temperature pneumatic stop valve according to the embodiment of the invention;
fig. 6 is a schematic view of a retainer ring of an ultra-low temperature pneumatic stop valve and an air guide hole on a piston cylinder according to an embodiment of the invention.
In all the figures, the same reference numerals denote the same features, in particular: 1-a valve body, 2-a valve core assembly, 3-a set screw, 4-a steel ball, 5-a spring, 6-a bellows assembly, 7-a first retainer ring, 8-a first universal plug seal, 9-a combined support ring, 10-a first sealing gasket, 11-a second sealing gasket and 12-a pneumatic actuator; 21-nut, 22-elastic cushion, 23-flat cushion, 24-valve core and 25-valve core block; 61-valve stem, 62-bellows, 63-valve seat; 1201-piston cylinder, 1202-first spring collar, 1203-second collar, 1204-second universal plug seal, 1205-supporting collar, 1206-piston, 1207-second spring collar, 1208-third collar, 1209-third universal plug seal, 1210-piston cap, 1211-third sealing gasket, 1212-shock pad, 1213-screw, 1214-joint and 1215-fourth sealing gasket.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides an ultralow temperature pneumatic stop valve for liquid oxygen, liquid nitrogen and LNG (liquefied natural gas), and figure 1 is a schematic cross-sectional view of the whole structure of the ultralow temperature pneumatic stop valve in an embodiment of the invention, and the ultralow temperature pneumatic stop valve comprises a valve body 1, a valve core assembly 2 and a corrugated pipe assembly 6, wherein the valve core assembly 2 and the corrugated pipe assembly 6 are arranged in a channel in an inner cavity of the valve body 1, the bottom of the corrugated pipe assembly 6 is detachably and fixedly connected with the valve core assembly 2, and the top of the corrugated pipe assembly 6 is. Wherein the bellows assembly 6 and the valve core assembly 2 are arranged in the inner cavity of the valve body 1 after being assembled, and the pneumatic actuator 12 is connected with the top of the bellows assembly 6 and arranged outside the valve body 1.
Specifically, as shown in fig. 1, the valve body 1 in the embodiment of the present invention is a housing that is approximately a solid of revolution, and is provided with an inlet and an outlet, and an inner cavity in which the valve core assembly 2 and the bellows assembly 6 are installed, respectively, and sealing bands are provided at corners of the inlet and the outlet, in a direction perpendicular to an axis of the solid of revolution, for sealing between the valve core assembly 1 and the valve body.
Fig. 2 is a schematic structural diagram of a valve core assembly of an ultralow temperature pneumatic stop valve according to an embodiment of the present invention, and as shown in fig. 2, the valve core assembly 2 includes a nut 21, an elastic pad 22, a flat pad 23, a valve core 24, and a valve core block 25, wherein one end of the valve core 24 is provided with an annular groove, the middle of the annular groove is a cylindrical structure with threads, the annular valve core block is arranged in the annular groove and matched with the cylindrical structure, and is pressed and locked by the nut 21 through the flat pad 23 and the elastic pad 22 sleeved on the cylindrical structure. An inner hole is formed in the valve core 24 in the direction opposite to the axial direction of the valve core block 25, the diameter of the inner hole is D1, the inner surface of the inner hole is a valve core positioning surface DW III 1, the inner hole is provided with a hemispherical valve core spherical groove QXC I for installing a steel ball, a threaded channel LWTD is arranged in the radial direction of the inner hole, and the central line of the threaded channel coincides with the central line of the valve core spherical groove QXC I for installing the steel ball 4 and the set screw 3.
The radius of the valve core spherical groove QXC I is SR1, the diameter of the steel ball 4 is d, and the value of (2 x SR1-d) is preferably (0.15-0.25) mm. The thread of the thread channel LWTD is selected to ensure that the minor diameter of the thread is larger than the diameter d of the steel ball.
24 hole axial direction designs of case have ring tube-shape case spring location axle THDWZ I for spring 5 installation location, case spring location axle TJDWZ I hole diameter is preferred to be bigger than bellows external diameter (0.5 ~ 1) mm.
Preferably, a plurality of grooves are arranged on the contact surface of the annular groove and the valve core block 25, more preferably a V-shaped groove VC with the depth of about 0.5mm, and when the valve core block 25 is stressed, the groove is deformed and extruded into the V-shaped groove, so that the sealing reliability is enhanced.
Preferably, the valve core 24, the flat gasket 23, the elastic gasket 22 and the nut 21 are made of low temperature resistant stainless steel, the nut 21 is a self-locking nut with a self-locking function, the valve core block 25 is made of polychlorotrifluoroethylene, the valve core assembly 2 and the valve body 1 are designed to be non-metal and metal soft sealing, and the sealing is reliable at low temperature.
FIG. 3 is a schematic structural diagram of an ultra-low temperature pneumatic stop valve bellows assembly according to an embodiment of the present invention. With reference to fig. 1 to 3, the bellows assembly 6 includes a bellows 62, and a valve seat 63 and a valve stem 61 respectively welded to two ends of the bellows 62, wherein the valve stem 62 can move axially and can be sealed reliably during movement. The bellows assembly 6 material is preferably low temperature stainless steel.
The valve rod 61 of the corrugated pipe assembly 6 is inserted into the inner hole of the valve core 24, and the valve rod 61 extends into a hemispherical valve rod spherical groove QXC II arranged in the valve core 24, and the radius is SR 1. Complete spherical groove is constituteed with case spherical groove QXC I to valve rod spherical groove QXC II, a plurality of steel ball 4 fills in complete spherical groove through screw thread passageway LWTD, and screw thread passageway LWTD is equipped with holding screw 3, be used for blocking steel ball 4, ensure that steel ball 4 does not fall out, thereby realize valve rod 61 and case 24's axial connection, and through the position control of spherical groove, ensure that valve rod installation back bottom surface and case mounting hole bottom surface distance delta H1 are between (0.3 ~ 0.5) mm, make valve rod 61 and case 24 pass power in axial direction and realize through steel ball 4.
The diameter of the section of the connecting part of the valve rod 61 and the inner hole of the valve core 24 is D2, the outer surface is a valve rod positioning surface DW III 2, and the valve rod positioning surface DW III and the valve core positioning surface DW III 1 form a valve core and valve rod positioning DWIII to ensure the radial positioning of the valve core 24 and the valve rod 61.
The valve seat 63 is a step-shaped shaft part and is arranged on one side, opposite to the valve core assembly 2 in the axial direction, of the valve seat assembly, a through hole is formed in the valve seat 63, the valve seat assembly is sleeved outside the corrugated pipe 62 and the valve rod 61, the valve seat spring positioning shaft THDWZ II with sequentially increased outer diameter sizes, the radial sealing surface JXMFM, the positioning surface DWM I2 positioned on the valve seat and the valve body and the axial pressing table ZXYT are arranged outside the valve seat 63, and the axial pressing table ZXYT is pressed on the top of the valve body 1. In addition, the valve seat installation guide surface AZDXI with the conical surface at the beginning of the radial sealing surface JXMFM is convenient for installation of the flooding plug seal I, and the cone angle theta value of the valve seat installation guide surface AZDXI is preferably (15-25) °.
With reference to fig. 1 to 3, a plurality of springs 5 are respectively disposed on the outer sides of the valve seat spring positioning shaft THDWZ ii and the valve core spring positioning shaft THDWZ i, the springs 5 are axially disposed between the valve core assembly 2 and the valve seat 63, and radially disposed on the outer sides of the valve seat spring positioning shaft THDWZ ii and the valve core spring positioning shaft THDWZ i. Two ends of the spring 5 are respectively positioned by a valve core spring positioning shaft TJDWZ I and a valve seat spring positioning shaft TJDWZ II, an initial pre-pressure is generated after installation, and when the pneumatic actuating mechanism 12 does not act, the valve is in a closed state under the acting force of the spring pre-pressure.
A first check ring 7, a first general plug seal 8 and a combined support ring 9 are sequentially arranged in the radial direction between the valve seat 63 and the valve body 1 to form a self-pressurization sealing structure, so that the sealing in the radial direction is realized, and a valve body positioning surface DWI 1 and a valve seat positioning surface DWI 2 form a valve body and valve seat positioning DWI to realize the radial positioning. And the roughness of the positioning surface DWI 1 of the valve body 1 and the positioning surface DWI 2 of the valve seat 63 is preferably Ra (0.4-0.8).
The first general plug seal 8 is a Y-shaped lip low-temperature-resistant sealing element with a built-in metal spring, and after initial installation, under the action of the pre-tightening force of the built-in spring, the lip outer cover has a certain deformation amount and realizes initial sealing with the valve body 1 and the valve seat 63 respectively; when medium pressure exists, the medium enters the lip of the lip-shaped outer cover through the uniformly distributed air guide holes DQK I of the first retainer ring 7, and the lip-shaped outer cover is further tensioned under the action of the medium pressure, so that the sealing of the valve body 1 and the valve seat 63 is realized.
More preferably, the sealing in the axial direction is also achieved by the first seal gasket 10 being arranged in the axial direction of the valve body 1 and the valve seat 63. The first sealing gasket 10 is arranged in a mounting groove on the valve body 1, the valve seat 63 is pressed on the first sealing gasket 10, the first sealing gasket 10 is deformed by pressing force to fill the mounting groove between the valve seat 63 and the valve body 1, and axial sealing is realized.
The roughness of the sealing surface of the valve body 1 and the valve seat 63 for sealing in the radial direction is preferably Ra (0.1-0.2), and the roughness of the sealing surface in the axial direction is preferably Ra (0.2-0.4).
The self-pressurization sealing structure formed by the first check ring 7, the first general plug seal 8 and the combined support ring 9 can realize low-temperature sealing, and a little leakage can be caused under abnormal conditions; the axial seal is the last line of defense, if radial direction realizes complete seal, the longitudinal seal line of defense is the redundancy design, if radial direction exists and little medium leaks, the line of defense can ensure reliable seal, no low temperature medium leaks. Therefore, an axial sealing structure is a preferred arrangement, and a solution in which only a radial sealing structure is provided is also within the scope of the present invention.
The radial direction sealing is realized through the first check ring, the first universal plug seal, the combined support ring and the valve body which are arranged on the valve seat and the valve body in the radial direction, the axial direction sealing is realized through the sealing arranged on the valve body in the axial direction, and the reliable sealing of the valve body and the valve seat is ensured through the combined design of the radial self-pressurization sealing structure and the axial redundant sealing.
Fig. 4 is a schematic structural diagram of a pneumatic actuator of an ultra-low temperature pneumatic stop valve according to an embodiment of the present invention. The actuator 12 includes a piston cylinder 1201, a first spring collar 1202, a second collar 1203, a second wiper seal 1204, a back-up collar 1205, a piston 1206, a second spring collar 1207, a third collar 1208, a third wiper seal 1209, a piston cap 1210, a third seal 1211, a cushion 1212, a screw 1213, a joint 1214, and a fourth seal 1215.
The actuator 12 comprises a shaft-mounted part piston cylinder 1201, two ends of the shaft-mounted part piston cylinder 1201 are flanges respectively connected with the valve body 1 and the piston cover 1210, the inner cavity of the piston cylinder 1201 is a piston cavity, a piston 1206 arranged in the piston cavity divides the piston cavity into two sealing cavities, a first sealing cavity MFQ I is formed between the piston 1206 and the bottom of the piston cavity, and a second sealing cavity MFQ II is formed between the piston 1206 and the piston cover 1210.
The piston cylinder 1201 is fixedly connected with a valve seat 63 arranged at the top of the valve body 1, a positioning ring groove is designed at the contact part of the piston cylinder 1201 and the valve seat 63, and a piston cylinder positioning surface DWM II 2 at the outer side of the ring groove and a positioning surface DWM II 1 positioned on the valve seat and the piston cylinder form a valve seat and piston cylinder positioning DW II to ensure the radial positioning of the valve seat and the piston cylinder.
Preferably, the second sealing gasket 11 is arranged in the annular groove, so that an inner cavity formed by the valve seat 63 and the piston cylinder 1201 is relatively sealed, a large amount of water vapor is prevented from entering, and a connecting rod of the piston 1206 cannot be scratched due to water vapor freezing in the movement process during ultralow-temperature operation.
Preferably, the piston cover 1210 and the piston cylinder 1201 are connected and locked by a uniformly distributed circle of screws, and are sealed by a third sealing gasket 1211 which is respectively arranged in a combined annular groove of the piston cover 1210 and the piston cylinder 1201. The third gasket 1211 is an M-shaped gasket, a W-shaped mounting groove is formed on the valve body 1, a portion of the third gasket 1211 is disposed in the mounting groove, and a protruding portion is disposed in an annular groove of the piston cap 1210, more preferably, a V-shaped groove VC is formed on a sealing surface of the annular groove, and after the screw is fastened, the piston cap 1210 compresses the third gasket 1211 to deform it to fill the mounting annular groove, thereby achieving sealing.
The piston cover 1210 is provided with a control gas inlet A, which is communicated with the second seal cavity MFQI for charging and discharging control gas of the second seal cavity MFQI. The piston cylinder 1201 is provided with a pilot vent near the bottom of the piston bore, communicating with the fitting 1214, and sealed by a fourth seal 1215 to form a first sealed chamber mfqi control gas charge and discharge passage, the inlet of the fitting 1214 being the control gas port B. The nipple 1214 and the piston cylinder 1201 are preferably provided with a fuse hole BXK, which is used to prevent malfunction after fitting.
Self-pressurizing seals, preferably two sets of seals, are provided in the piston chamber between the piston 1206 and the piston cylinder 1201, each set of seals including a second spring retainer 1207, a third retainer 1208, and a third wiper seal 1209. The lip of the third pan-stopper seal 1209 faces the piston head and the piston rod, respectively, and when a pressure medium exists, the medium enters the lip of the third pan-stopper seal 1209 through the air guide hole DQK ii of the third retainer ring 1208, so that high-pressure sealing is realized.
The bottom connecting rod of the piston 1206 penetrates through the piston cylinder 1201 and is in threaded connection with the valve rod 61, and the minimum distance delta H2 between the piston 1206 and the piston cylinder 1201 is ensured to be (1-1.5) mm by fine adjustment of the threaded screwing length, and the stroke H of the piston 1206 is a switching stroke, which is generally about (0.26-0.29) of the valve passing through.
The connecting rod of the piston 1206 and the piston cylinder 1201 are sealed by a self-pressurization sealing element consisting of a first spring retainer ring 1202, a second retainer ring 1203, a second universal plug seal 1204 and a support retainer ring 1205, the lip of the second universal plug seal 1204 faces the direction of a medium, and the medium enters the lip through a piston cylinder air guide hole DQK III to realize sealing.
A piston cavity inlet of the piston cylinder 1201 is provided with a piston cylinder installation guide surface AZDX III, the head of a connecting rod of the piston 1206 is provided with a piston installation guide surface AZDX II, when the piston 1206 is installed, guide is led in, parts with compression are prevented from being damaged, namely a third general plug seal 1209 and a second general plug seal 1204, and the cone angle theta value of the guide surface is preferably (15-25) °. The roughness of the sealing surface of the piston cylinder 1201 and the piston 1206 dynamic seal is preferably Ra (0.1-0.2), the roughness of the guide surface is preferably Ra (0.4-0.8), and the guide surface and the sealing surface are directly excessive by using an arc.
The piston 1206 is preferably provided with a shock pad 1212 at the head and secured thereto by screws 1213. the shock pad 1212 is preferably polychlorotrifluoroethylene and acts as a shock absorber when the valve is opened.
The invention discloses an ultralow temperature pneumatic stop valve, which sequentially comprises a valve body 1, a valve core assembly 2, a corrugated pipe assembly 6 and a pneumatic actuating mechanism 12 from bottom to top. The corrugated pipe assembly 6 and the valve core assembly 2 are installed in the inner cavity of the valve body after being assembled, and the valve seat 63 is clamped on the interface surface of the valve body 1; the piston cylinder 1201 of the pneumatic actuator 12 is pressed on the valve seat 63, the piston cylinder 1201 is connected with the valve body 1 through uniformly distributed screws to press the valve seat 63, and the piston 1206 of the pneumatic actuator 12 is connected with the valve rod 61 of the corrugated pipe assembly 6 through threads to realize linkage.
The ultralow-temperature pneumatic stop valve has the following working process that in an initial state, the valve is in a closed state due to the pretightening force of the spring 5, when the valve is ready to be used, control gas is filled into the first sealing cavity MFQ I through the control gas port A, the control gas acts on the piston 1206 to close the valve, and a medium entering from an inlet is cut off; when the valve is required to be opened, the control gas port B is used for filling control gas into the second sealing cavity MFQ II, and meanwhile, the A port is used for releasing the control gas of the first sealing cavity MFQ I, so that the force of the control gas acting on the piston 1206 enables the piston 1206 to move upwards and drives the valve rod 61 and the valve core assembly 2 to move, and the valve is opened; when the valve is required to be closed, control gas is filled into the first sealing cavity MFQ I through the control gas port A, control gas is discharged from the second sealing cavity MFQ II through the port B, the piston 1206 moves downwards due to the force of the control gas acting on the piston 1206, the valve rod 61 and the valve core 2 are driven to move, and the valve is closed. The ultra-low temperature pneumatic stop valve of the invention uses high pressure control gas to act on the piston 1206 to close the valve, so that the valve outlet can bear higher reverse impact pressure.
The invention improves a plurality of aspects such as the structure, the arrangement and the sealing mode of key components (the reliability of the motion dynamic seal of the valve rod of the ultralow temperature medium is solved by applying the corrugated pipe assembly, the static seal of the ultralow temperature medium is ensured by the combined design of the self-pressurization sealing structure and the redundant seal, the self-pressurization sealing structure solves the problem of controlling the low temperature dynamic seal of air, the structure is compact and the weight is reduced by the optimization of the whole structure, the positioning design, the connection of steel balls and the like), tests show that the valve rod can be suitable for the working conditions of the pressure of (3-15) MPa and the drift diameter of (15-50) mm, and compared with similar products, the valve rod has the advantages of compact structure, reliable seal, light weight, convenient assembly and maintenance.
The invention discloses an ultralow temperature pneumatic stop valve, which comprises the following installation method:
s1: counting and cleaning all parts; wherein, the degreasing treatment is carried out by a valve body 1, a set screw 3, a steel ball 4, a spring 5, a first retainer ring 7, a first universal plug seal 8, a combined support ring 9, a first sealing gasket 10, a nut 21, an elastic gasket 22, a flat gasket 23, a valve core 24, a valve core 25, a valve rod 61, a corrugated pipe 62 and a valve seat 63;
s2: the valve core block 25 is arranged in the valve core 24 and is tightly pressed and locked by the flat gasket 23, the elastic gasket 22 and the nut 21;
s3: sequentially installing a first check ring 7, a first universal plug seal 8, a combined support ring 9 and a first sealing gasket 10 into the valve body 1, wherein the lip of the first universal plug seal 8 faces to the medium direction;
s4: two groups of third general plug seals 1209, third retaining rings 1208 and second spring retainers 1207 are respectively and sequentially installed on the piston 1206 from two directions, and the lip installation directions of the third general plug seals 1209 are respectively towards the head of the piston and the piston connecting rod; sequentially installing a second universal plug seal 1204, a supporting retainer ring 1205, the second universal plug seal 1204, a retainer ring II 1203 and a spring retainer ring I1202 into the piston cylinder 1201, wherein the lip of the universal plug seal II 1204 faces the direction of a piston cavity;
s5: slightly pressing the piston 1206 with the sealing element into the piston cylinder 1201 with the sealing element to ensure that the piston 1206 is attached to the bottom of the piston cavity; mounting a third sealing gasket 1211 and a piston cover 1210, and locking by using a flat gasket, an elastic gasket and a screw;
s6: the second sealing gasket 11 is arranged in a positioning ring groove of the piston cylinder 1201, and the corrugated pipe assembly 6 is in threaded connection with a connecting rod of a piston 1206 of the actuating mechanism 12 through threads of the valve rod 61;
s7: installing a spring 5 on a valve core spring positioning shaft TJDWZ I, pressing a valve core assembly 2 to enable a valve rod 61 to be gradually inserted into an inner hole of a valve core 24 until spherical grooves of the valve rod and the valve core coincide, installing a steel ball 4 from a threaded passage LWTD, and screwing a set screw 3 into the threaded passage LWTD;
s8: the bellows component with the valve core component 2 is placed in the valve body 1, the valve seat 63 is gradually pressed into the valve body 1 by pressing the piston cover 1210 until the valve seat 63 presses the first sealing gasket 10, and the first sealing gasket is locked by a flat gasket, an elastic gasket and a screw;
s9: the fourth seal 1215 and the nipple 1214 are sequentially installed into the mounting hole of the piston cylinder 1201, tightened, and the nipple 1214 and the safety hole of the piston cylinder 1201 are locked by stainless steel wire.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. An ultralow temperature pneumatic stop valve is characterized by comprising a valve body (1), a valve core assembly (2) and a corrugated pipe assembly (6), wherein the valve core assembly (2) and the corrugated pipe assembly (6) are arranged in an inner cavity channel of the valve body (1);
the bottom of the corrugated pipe assembly (6) is detachably and fixedly connected with the valve core assembly (2), one end of a valve core (24) in the valve core assembly (2) is provided with a valve core block, one end of the valve core block in the direction opposite to the axial direction is provided with an inner hole, the bottom of a valve rod (61) of the corrugated pipe assembly (6) is inserted into the inner hole, the tops of the valve rod (61) and a corrugated pipe (62) are sleeved in a valve seat (63), and the valve seat (63) is clamped on the interface surface of the valve body (1);
the top of the bellows component (6) is detachably and fixedly connected with an actuating mechanism (12), a bottom connecting rod of a piston (1206) penetrates through a piston cylinder (1201) and is connected with the valve rod (61), the piston cylinder (1201) is fixedly connected with the valve seat (63) and the valve body (1) respectively, the piston (1206) arranged in the piston cylinder (1201) divides the piston cylinder into two sealed cavities, a first sealed cavity MFQ I is formed between the piston (1206) and the bottom of the piston cavity and is communicated with a control air port B, a second sealed cavity MFQ II is formed between the piston (1206) and a piston cover (1210) and is communicated with the control air port A, and valve opening and closing are realized through charging and discharging of control air in A and B.
2. The ultra-low temperature pneumatic stop valve of claim 1, wherein a self-pressurizing sealing element is arranged between the piston (1206) and the piston cylinder (1201), and comprises a plurality of groups of second spring retainer rings (1207), third retainer rings (1208) and third flooding plug seals (1209), wherein the lips of the third flooding plug seals (1209) face to the head of the piston and the connecting rod of the piston respectively.
3. Ultralow temperature pneumatic stop valve according to claim 1 or 2, characterized in that the connecting rod of the piston (1206) and the piston cylinder (1201) are sealed by a first spring collar (1202), a second collar (1203), a second flooded seal (1204) and a support collar (1205), wherein the lips of the second flooded seal (1204) are all directed towards the medium.
4. The ultra-low temperature pneumatic stop valve according to any one of claims 1 to 3, wherein the control air port A is provided on the piston cover (1210) and communicates with the second seal chamber MFQI; the bottom of the piston cylinder (1201) is provided with a guide air hole which is communicated with a joint (1214), and the control air hole A is arranged on the joint (1214) and is communicated with the first sealing cavity MFQ I.
5. Ultra-low temperature pneumatic stop valve according to any one of claims 1-4, characterized in that the valve seat (63) and the valve body (1) are provided with a first retainer ring (7), a first flooding plug seal (8) and a combined support ring (9) in the radial direction so as to form a radial self-pressurization sealing structure with the valve body (1).
6. Ultralow temperature pneumatic stop valve according to any one of claims 1 to 5, characterized in that the valve seat (63) and the valve body (1) are provided with a first gasket (10) in the axial direction, and the first gasket (10) is provided in a mounting groove on the valve body (1).
7. An ultra-low temperature pneumatic stop valve as claimed in any one of claims 1 to 6, wherein the valve rod (61) extends into a valve rod spherical groove QXC II arranged in the valve core (24), the valve rod spherical groove QXC II and the valve core spherical groove QXC I form a complete spherical groove, and a plurality of steel balls (4) are filled in the complete spherical groove.
8. Ultra-low temperature pneumatic stop valve according to any one of claims 1-7, characterized in that the valve core spherical groove of the inner hole for installing the steel ball (4) is provided with a thread channel LWTD in the radial direction of the inner hole, and the thread channel LWTD is provided with a set screw (3).
9. The ultra-low temperature pneumatic stop valve according to any one of claims 1 to 8, wherein the valve seat (63) is externally provided with a valve seat spring positioning shaft THDWZ II with sequentially increasing outer diameter size, a radial sealing surface JXMFM, a positioning surface DWM I2 on the valve seat for positioning with the valve body, and an axial pressure table ZXYT which is pressed on the top of the valve body (1).
10. The ultra-low temperature pneumatic stop valve of any one of claims 1-9, further comprising a plurality of springs (5), the springs (5) being disposed axially between the spool assembly (2) and the valve seat (63) and radially outward of the seat spring positioning axis THDWZ ii and the spool spring positioning axis THDWZ i.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010413201.XA CN111609148A (en) | 2020-05-15 | 2020-05-15 | Ultralow-temperature pneumatic stop valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010413201.XA CN111609148A (en) | 2020-05-15 | 2020-05-15 | Ultralow-temperature pneumatic stop valve |
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| CN111609148A true CN111609148A (en) | 2020-09-01 |
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| CN202010413201.XA Pending CN111609148A (en) | 2020-05-15 | 2020-05-15 | Ultralow-temperature pneumatic stop valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112178210A (en) * | 2020-09-03 | 2021-01-05 | 湖北三江航天红峰控制有限公司 | Ultralow-temperature pneumatic stop valve |
| CN112879571A (en) * | 2021-01-18 | 2021-06-01 | 湖北三江航天红峰控制有限公司 | Low-temperature corrugated pipe valve |
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| CN109458462A (en) * | 2018-11-29 | 2019-03-12 | 河南航天液压气动技术有限公司 | A kind of valve |
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| CN2296418Y (en) * | 1996-08-18 | 1998-11-04 | 王兆修 | Double seal ring type single function slurry pump piston |
| CN102966789A (en) * | 2012-11-06 | 2013-03-13 | 浙江盾安阀门有限公司 | Multiply sealed corrugated pipe stop valve |
| CN103925391A (en) * | 2014-04-25 | 2014-07-16 | 宁波南车时代传感技术有限公司 | Two-position three-way valve with air control end |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112178210A (en) * | 2020-09-03 | 2021-01-05 | 湖北三江航天红峰控制有限公司 | Ultralow-temperature pneumatic stop valve |
| CN112178210B (en) * | 2020-09-03 | 2022-12-23 | 湖北三江航天红峰控制有限公司 | Ultralow-temperature pneumatic stop valve |
| CN112879571A (en) * | 2021-01-18 | 2021-06-01 | 湖北三江航天红峰控制有限公司 | Low-temperature corrugated pipe valve |
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Application publication date: 20200901 |