CN216479044U

CN216479044U - Bidirectional wedge-shaped sealing structure and low-temperature fixed ball valve with same

Info

Publication number: CN216479044U
Application number: CN202123112250.9U
Authority: CN
Inventors: 倪君瑞; 章晓波; 刘超; 白玉洁
Original assignee: SHANGHAI MECCO VALVE CO Ltd
Current assignee: SHANGHAI MECCO VALVE CO Ltd
Priority date: 2021-12-10
Filing date: 2021-12-10
Publication date: 2022-05-10
Anticipated expiration: 2031-12-10

Abstract

The application relates to a bidirectional wedge-shaped sealing structure and a low-temperature fixed ball valve with the same, which are suitable for sealing between a valve seat and a valve body and comprise a valve seat sealing ring and a wedge-shaped pad; the valve seat sealing ring is annular, the two directions of the valve seat sealing ring are both provided with opening structures, and the size of the opening structures is gradually reduced from the two sides to the middle part of the valve seat sealing ring; the wedge pad is the annular, and the one end of wedge pad is for stretching into the end, with open structure phase-match, and the other end is the stiff end, is suitable for to laminate mutually with valve body, disk seat and mounting structure between the two, and the quantity of wedge pad is two, stretches into to open structure in wherein one side of valve seat sealing washer respectively. The end that stretches into of wedge pad stretches into to the open structure in, laminates mutually through valve body, disk seat and mounting structure between the two to make the disk seat sealing washer can bear bigger extrusion force, the deformation volume is also bigger, easily seals under abominable or extreme service environment, and can guarantee that it has better sealed effect.

Description

Bidirectional wedge-shaped sealing structure and low-temperature fixed ball valve with same

Technical Field

The application relates to the technical field of valve body sealing, in particular to a bidirectional wedge-shaped sealing structure and a low-temperature fixed ball valve with the same.

Background

The valve seat of the ball body is of a metal piston structure, and the sealing between the metal valve seat and the valve body is usually realized by adopting an O-shaped ring or a lip-shaped ring. The rubber O-shaped ring is limited by materials and can only be used for-50 degrees; the V-shaped spring of lip circle installation, the spring force is very little to the sealed face extrusion force of lip, and low temperature warp back is difficult to seal to the installation requires extremely high, leads to two-way sealed difficulty.

SUMMERY OF THE UTILITY MODEL

In view of this, the present application provides a bidirectional wedge-shaped sealing structure, which is suitable for sealing between a valve seat and a valve body, and comprises a valve seat sealing ring and a wedge-shaped pad; the valve seat sealing ring is annular, opening structures are arranged on two sides of the valve seat sealing ring, and the size of each opening structure is gradually reduced from the two sides of the valve seat sealing ring to the middle of the valve seat sealing ring; the wedge pad is the annular, the one end of wedge pad for stretching into the end, with open structure phase-match, the other end be the stiff end, be suitable for with the valve body the disk seat is laminated mutually with mounting structure between the two, the quantity of wedge pad is two, follows respectively one of them one side of disk seat sealing washer stretch into extremely in the open structure.

In a possible implementation manner, the inner side wall of the opening structure is an inclined arc-surface structure and is connected with the bottom arc surface of the opening structure, and the inclined arc-surface structure and the annular peripheral surface coaxial with the inclined arc-surface structure form a preset included angle, and the value of the preset included angle is [ 10-20 ° ].

In one possible implementation, the device further comprises an elastic fastener; the wedge-shaped pad on one side is provided with a mounting hole in the direction deviating from the extending end of the wedge-shaped pad, and the mounting hole is matched with the elastic fastener; the number of the mounting holes is more than two, and the mounting holes are arranged in the circumferential direction of the wedge-shaped pad at equal intervals.

In one possible implementation, the wedge-shaped pad comprises a first wedge-shaped pad and a second wedge-shaped pad; the mounting hole is formed in the first wedge-shaped pad; the thickness of the fixed end of the second wedge-shaped pad towards one side of the ring center is larger than the thickness of the fixed end of the second wedge-shaped pad deviating from one side of the ring center.

In a possible implementation manner, the length of the edge of the extending end of the wedge-shaped pad is consistent with the length of the inclined cambered surface structure, and the head of the extending end of the wedge-shaped pad is a plane and is smoothly connected with the edge; the width of the fixed end of the wedge-shaped pad is larger than the maximum width of the extending end.

In a possible implementation manner, the middle part of the valve seat sealing ring facing to one side wall of the ring core is provided with a concave arc-shaped surface; the middle part of the valve seat sealing ring, which is far away from one side wall of the ring core, is provided with the same concave arc-shaped surface.

In a possible implementation manner, the opening structures on two sides of the valve seat sealing ring are symmetrically arranged; the preset included angle is 15 degrees; the number of the mounting holes is even; the elastic fastener is a spring bolt; the valve seat sealing ring is made of soft materials; the wedge-shaped pad is made of metal.

On the other hand, the application also provides a low-temperature fixed ball valve, which further comprises an ejector rod; an upstream valve seat support ring is arranged in the upstream piston valve seat, first lugs transversely extend towards two sides respectively and are arranged at one end, close to the ball body, in the upstream valve seat support ring, and ejector rod fixing holes are formed in the first lugs; the downstream piston valve seat comprises a downstream valve seat supporting ring, one end of the downstream valve seat supporting ring, which is adjacent to the ball body, transversely extends to two sides to form second lugs, and the second lugs are provided with the same ejector rod fixing holes; the top rod has an adjusting stroke at least one end, one end of the top rod of the ball body is fixed in the top rod mounting hole on the first lug, the other end of the top rod of the ball body is fixed in the top rod mounting hole on the second lug, the maximum length of the top rod is larger than the maximum radial length of the ball body, and the distance between the upstream piston valve seat and the downstream piston valve seat can be expanded so as to take out the ball body for disassembly, inspection and maintenance.

In a possible implementation manner, the two outermost edges of the unsealed part of the sphere have tangent planes, the tangent planes of the two sides of the sphere are symmetrical, and the tangent plane of the sphere is perpendicular to the direction of the communication ports at the two ends of the sphere.

In a possible implementation manner, the middle cavity of the valve body is adjacent to the position of the ejector rod, and a yielding recess matched with the ejector rod is arranged at the position of the ejector rod and used for yielding the ejector rod.

In a possible implementation manner, the upstream piston valve seat further comprises an annular first valve seat, and a valve seat installation groove matched with the first valve seat is formed in one side, adjacent to the ball, of the upstream valve seat support ring; the downstream piston valve seat further comprises an annular second valve seat and an annular third valve seat, and two valve seat mounting grooves with different sizes are formed in one side, adjacent to the ball body, of the downstream valve seat supporting ring and are respectively matched with the second valve seat and the third valve seat; one end of the bidirectional wedge-shaped sealing structure, which is adjacent to the ball body, is abutted and fixed into the valve body through a sealing ring pressing ring; spring holes are formed in the ends, far away from the ball body, of the upstream valve seat support ring and the downstream valve seat support ring, are arranged at equal intervals in the circumferential direction of the upstream valve seat support ring, and upstream valve seat springs are mounted in the spring holes; the spring holes are arranged at equal intervals in the circumferential direction of the downstream valve seat support ring, and downstream valve seat springs are arranged in the spring holes; lifting lugs are respectively arranged at the tops of the outer walls of the two sides of the valve body; the outer wall of the valve body, which is not provided with the through hole, is transversely provided with more than two reinforcing ribs which are arranged at intervals along the longitudinal direction.

The beneficial effect of this application: install between disk seat and valve body through with two-way wedge seal structure, replace the O type circle or the lip ring seal of conventional use, two-way open structure's valve seat sealing washer, the end of stretching into of wedge pad inserts the easy implementation personnel installation in this field of open structure, improve assembly efficiency, use manpower sparingly, and the end of stretching into of wedge pad stretches into to the open structure in, through the valve body, disk seat and mounting structure between the two laminate mutually, so that valve seat sealing washer can bear bigger extrusion force, the deformation volume is also bigger, easily seal under abominable or extreme service environment, and can guarantee that it has better sealed effect. The size of open structure reduces from the both sides of disk seat sealing washer to the middle part gradually, compares in the same open structure of width, and sealed face receives the extrusion force bigger to make the two-way wedge seal structure of this application connect inseparabler.

Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the application and, together with the description, serve to explain the principles of the application.

FIG. 1 illustrates a partial cross-sectional view of a bi-directional wedge seal structure according to an embodiment of the present application;

FIG. 2 illustrates a force diagram of a bi-directional wedge seal structure according to an embodiment of the present application;

FIG. 3 illustrates a side cross-sectional view of one of the cryogenically fixed ball valves according to an embodiment of the present application;

FIG. 4 illustrates a partial cross-sectional view of an upstream piston valve seat according to an embodiment of the present application;

FIG. 5 illustrates a partial cross-sectional view of a downstream piston valve seat according to an embodiment of the present application;

FIG. 6 illustrates a side cross-sectional view of a cryostatic ball valve according to an embodiment of the present application;

FIG. 7 illustrates an internal schematic view of a cryostatic ball valve according to an embodiment of the present application;

FIG. 8 shows a schematic view of a cryostatic ball valve according to an embodiment of the present application;

FIG. 9 illustrates a perspective view of a cryostatic ball valve according to an embodiment of the present application;

fig. 10 is a schematic view illustrating an internal structure of another angle cryostatic ball valve according to an embodiment of the present application.

Detailed Description

Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

It will be understood, however, that the terms "central," "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the present application or for simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present application. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present application.

FIG. 1 illustrates a partial cross-sectional view of a bi-directional wedge seal structure according to an embodiment of the present application; FIG. 2 illustrates a force diagram of a bi-directional wedge seal structure according to an embodiment of the present application; FIG. 3 illustrates a side cross-sectional view of one of the cryogenically fixed ball valves according to an embodiment of the present application; FIG. 4 illustrates a partial cross-sectional view of an upstream piston valve seat according to an embodiment of the present application; FIG. 5 illustrates a partial cross-sectional view of a downstream piston valve seat according to an embodiment of the present application; FIG. 6 illustrates a side cross-sectional view of a cryostatic ball valve according to an embodiment of the present application; FIG. 7 illustrates an internal schematic view of a cryostatic ball valve according to an embodiment of the present application; FIG. 8 shows a schematic view of a cryostatic ball valve according to an embodiment of the present application; FIG. 9 illustrates a perspective view of a cryostatic ball valve according to an embodiment of the present application; fig. 10 is a schematic view illustrating an internal structure of another angle cryostatic ball valve according to an embodiment of the present application.

As shown in fig. 1 to 8, a bidirectional wedge seal structure adapted for sealing between a valve seat and a valve body 11, includes: valve seat sealing washer 5, 8 and wedge fill up, valve seat sealing washer 5, 8 are the annular, valve seat sealing washer 5, 8 two-way open structure 51 has all been seted up to 8, open structure 51 is half encirclement opening, and open structure 51's size is from valve seat sealing washer 5, 8 both sides to middle part direction reduce gradually, the wedge fills up and is the annular, the one end of wedge fill up is for stretching into the end, with open structure 51 phase-match, the other end is the stiff end, be suitable for and valve body 11, the disk seat is laminated mutually with mounting structure between the two, the quantity of wedge fill up is two, respectively from valve seat sealing washer 5, 8 wherein one side stretches into to the open structure 51 in.

In this embodiment, through will installing between disk seat and valve body 11 with two-way wedge seal structure, replace the O type circle or the lip ring seal of conventional use, the disk seat sealing washer 5 of two-way open structure 51, 8, the end of stretching into of wedge pad inserts the easy implementation personnel installation in this field of open structure 51, improve assembly efficiency, use manpower sparingly, and the end of stretching into of wedge pad stretches into to open structure 51 in, through valve body 11, disk seat and mounting structure between the two laminate mutually, so that disk seat sealing washer 5, 8 can bear bigger extrusion force, the deformation volume is also bigger, easily seal under abominable or extreme service environment, and can guarantee that it has better sealed effect. The size of the opening structure 51 is gradually reduced from the two sides of the valve seat sealing rings 5 and 8 to the middle part, and compared with the opening structure 51 with the same width, the extrusion force applied to the sealing surface is larger, so that the bidirectional wedge-shaped sealing structure is more tightly connected.

It should be noted here that the directions of the two-way openings of the valve seat seal rings 5 and 8 correspond to the directions of the through holes on both sides of the valve body 11, that is, the wedge-shaped pads respectively extend from the openings on both sides of the valve seat seal rings 5 and 8 to form a sealing structure, and the semi-closed opening structure 51, that is, the openings on both sides of the sealing seat of the valve body 11 are not communicated.

In one embodiment, the inner sidewall of the opening structure 51 is an inclined arc structure connected to the bottom arc of the opening structure 51, and the inclined arc structure and the annular circumferential surface coaxial with the inclined arc structure form a preset included angle, and the value of the preset included angle is [10 ° -20 ° ].

It is also important to note that the depth of each side-port structure 51 of the valve seat seal 5, 8 should not be too shallow, and preferably the depth of each side-port structure 51 should be greater than 1/4 of the valve seat seal 5, 8 along its axial length, to ensure the proper design of the side-port structure 51 and to provide a greater amount of compression and deformation during sealing.

In this embodiment, the inner side wall of the opening structure 51 on the valve seat sealing rings 5 and 8 is an inclined arc surface, the opening direction of the inclined arc surface is gradually reduced from the opening to the bottom of the opening, the inclined arc surface of the inner side wall of the opening structure 51 is connected with the bottom of the opening arc surface, the middle axis direction of the inclined arc surface is coincided with the through holes at two sides of the valve body 11, the inclined arc surface and the coaxial and equal-diameter annular surface have a preset inclination angle α, and α is more than or equal to 10 degrees and less than or equal to 20 degrees.

In one specific embodiment, the wedge-shaped cushion further comprises an elastic fastener 54, wherein mounting holes are formed in the wedge-shaped cushion on one side in the direction deviating from the extending end of the wedge-shaped cushion, the mounting holes are matched with the elastic fastener 54, the number of the mounting holes is more than two, and the mounting holes are arranged at equal intervals in the circumferential direction of the wedge-shaped cushion.

In this embodiment, the wedge-shaped pad deviates from the direction of the extending end thereof, that is, the end surface facing the opening direction of the two sides in the valve body 11 is provided with more than two mounting holes, the mounting holes are used for placing the elastic fasteners 54, and the practitioner in the field can increase the spring thrust F by adjusting the number of the elastic fasteners 54 and replacing the springs with different elastic forces, so that the valve seat sealing rings 5 and 8 obtain a proper or even larger sealing force F1.

More specifically, as shown in fig. 2, the preset inclination angle α of the inclined arc surface of the inner side wall of the opening structure 51 of the valve seat seal rings 5 and 8 is increased by several times through the wedge angle, and the lip of the valve seat seal ring 5 or 8 made of the soft sealing material is extruded by the thrust F of the spring. By adjusting the size and the number of the springs, the pushing force F of the springs can be increased, and finally, the sealing ring lip obtains a larger sealing force F1, so that the sealing ring can be used in a range from low temperature of-196 ℃ to normal temperature.

Preferably, the preset inclination angle alpha is 15 degrees, the thrust of the spring can be amplified by multiple times through the inclination angle, the double-lip surfaces of the valve seat sealing rings 5 and 8 made of soft sealing materials are extruded, and the sealing effect of the bidirectional wedge-shaped sealing structure is further improved.

As shown in fig. 1 and 3, in one embodiment, the wedge-shaped pad includes a first wedge-shaped pad 52 and a second wedge-shaped pad 53, the mounting hole is opened on the first wedge-shaped pad 52, and a thickness of a fixed end of the second wedge-shaped pad 53 facing the side of the ring center is greater than a thickness of a fixed end of the second wedge-shaped pad 53 facing away from the side of the ring center.

More specifically, in this embodiment, the wedge-shaped pad includes an extending end and a fixed end, wherein the extending end has a wedge-shaped structure in the cross section of the wedge-shaped pad along the annular axial direction and matches with the opening structure 51, and the fixed end has a square shape and is connected with the opening structure.

Furthermore, first wedge pad 52 is the wedge pad towards the outside direction one side of the through-hole of valve body 11, second wedge pad 53 is the wedge pad towards the center direction of valve body 11, the stiff end of first wedge pad 52, thickness H2 towards the side of the ring center and thickness H1 that deviates from the side of the ring center, thickness H4 that the stiff end of second wedge pad 53 towards the side of the ring center is greater than thickness H3 that the stiff end deviates from the side of the ring center to increase the area of contact of the stiff end of second wedge pad 53 and valve seat.

In one specific embodiment, the length of the edge of the side of the wedge-shaped pad extending into the arc-shaped surface structure is consistent with the length of the inclined arc-shaped surface structure, the head of the wedge-shaped pad extending into the end is a plane and is smoothly connected with the edge, and the width of the fixed end of the wedge-shaped pad is larger than the maximum width of the extending end.

In this embodiment, the extending end of the wedge-shaped pad is wedge-shaped, the front end of the wedge-shaped pad is a plane, the extending end is smoothly connected with the side edge of the wedge-shaped pad, and the width of the square fixing end is larger than the maximum width of the extending end, so that the contact area between the wedge-shaped pad and the valve seat sealing rings 5 and 8 is larger.

In one embodiment, the valve seat sealing rings 5 and 8 have concave arc surfaces towards the middle of one side wall of the ring core, and the valve seat sealing rings 5 and 8 have the same concave arc surfaces towards the middle of one side wall of the ring core.

In one embodiment, the opening structures 51 on the two sides of the valve seat sealing rings 5 and 8 are symmetrically arranged, the preset included angle α is 15 °, the number of the mounting holes is even, the elastic fasteners 54 are spring bolts, the valve seat sealing rings 5 and 8 are made of soft materials, and the wedge-shaped pads are made of metal materials.

In this embodiment, an even number of mounting holes is preferred, and typically an even number of resilient fasteners 54 will be provided in the mounting holes by those skilled in the art to ensure that the annular wedge pad is uniformly stressed.

Preferably, valve seat sealing washer 5, 8 select for use the PCTFE material, and the wedge pad selects for use stainless steel metal material.

The valve seat sealing rings 5 and 8 are made of PCTFE materials and designed into a double-lip surface with a two-way opening, wedge-shaped pads made of stainless steel metal materials are installed at two ends of each valve seat sealing ring, and the wedge-shaped pads are wedged into openings of the sealing rings through a circle of spiral springs which are evenly distributed. The selected PCTFE material can be used at the temperature of-196 ℃ in a low-temperature environment, namely the valve seat sealing rings 5 and 8 made of the PCTFE material and the wedge-shaped pad made of the stainless steel material are particularly suitable for being installed in a valve body 11 for conveying LNG (liquefied natural gas), and the sealing structure can reach the corresponding sealing standard in the low-temperature environment.

On the other hand, as shown in fig. 3-8, the present application further provides a low temperature fixed ball valve, which includes a valve body 11, a ball body 10, a valve rod, an upstream piston seat, a downstream piston seat and the two-way wedge-shaped sealing structure in any of the above embodiments, wherein two opposite ends of the valve body 11 are an upstream end and a downstream end, respectively, and are pre-opened with a through hole, and are communicated with a middle cavity of the valve body 11, the upper portion of the valve body 11 is further opened with a through hole, and is communicated with the middle cavity of the valve body 11, the top of the ball body 10 is opened with a valve rod mounting hole, and the ball body 10 is disposed in the middle cavity of the valve body 11, one end of the valve rod passes through the through hole and is detachably connected with the ball body 10, the upstream piston seat is annular and is mounted inside the upstream end of the valve body 11, one side adjacent to the through hole is matched with the ball body 10, the downstream piston seat is annular and is mounted inside the downstream end of the valve body 11, one side adjacent to the through hole is matched with the ball body 10, the number of the two-way wedge-shaped sealing structures is two, and the two-way wedge-shaped sealing structures are respectively clamped and fixed between the inner wall of the upstream end of the valve body 11 and the upstream piston valve seat and between the inner wall of the downstream end of the valve body 11 and the downstream piston valve seat.

Based on any preceding two-way wedge seal structure, this application still provides a low temperature fixed ball valve. The cryogenic fixed ball valve of the embodiment of the application comprises the bidirectional wedge-shaped sealing structure. Through installing any preceding two-way wedge seal structure between the disk seat of low temperature fixed ball valve and 11 inner walls of valve body, this two-way wedge seal structure designs into a two-way open-ended two lip shape face, and the wedge pad of stainless steel metal material is installed at both ends, enlargies several times through the wedge angle with the spring force on it, extrudees the disk seat sealing washer 5 of soft seal material, 8 lips, can guarantee to give great sealing force between valve body 11 and disk seat in low temperature to normal atmospheric temperature within range.

As shown in fig. 4 and 5, in this embodiment, two valve seats are provided on two sides of the valve body 11: the upstream piston valve seat and the downstream piston valve seat are matched with the ball 10, and the two bidirectional wedge-shaped sealing structures are respectively arranged between the upstream piston valve seat and the inner wall of the valve body 11 and between the downstream piston valve seat and the inner wall of the valve body 11.

Specifically, the fixed ball 10 has two valve seats, and due to the particularity of the working condition, when the pipeline stops working, the medium in the middle cavity of the valve body 11 is recovered to normal temperature from low temperature, and the medium expands, so that the pressure generated by the expanding medium in the middle cavity must be released.

As shown in fig. 7, in one embodiment, the device further comprises a top bar 14; an upstream valve seat support ring 4 is arranged in the upstream piston valve seat, a first lug 15 transversely extends towards two sides respectively at one end of the upstream valve seat support ring 4, which is close to the ball 10, and a mandril 14 fixing hole is formed in the first lug 15; the downstream piston valve seat comprises a downstream valve seat supporting ring 7, one end of the downstream valve seat supporting ring 7, which is adjacent to the ball 10, transversely extends to two sides to form second lugs 16, and the second lugs 16 are provided with the same mandril 14 fixing holes; the ejector rod 14 has an adjusting stroke at least one end, one end of the ejector rod 14 of the ball 10 is fixed in an ejector rod 14 mounting hole on the first lug 15, the other end of the ejector rod 14 is fixed in an ejector rod 14 mounting hole on the second lug 16, the maximum length of the ejector rod 14 is larger than the maximum radial length of the ball 10, and the distance between the upstream piston valve seat and the downstream piston valve seat can be expanded so as to take out the ball 10 for overhauling and maintenance.

In this embodiment, the upstream piston valve seat includes an upstream valve seat support ring 4, the downstream piston valve seat includes a downstream valve seat support ring 7, one end of the upstream valve seat support ring 4 adjacent to the ball 10 extends to both sides respectively with a first lug 15, one end of the downstream valve seat support ring 7 adjacent to the ball 10 extends to both sides respectively with a second lug 16, the specific structures of the first lug 15 and the second lug 16 are not limited, and only the first lug 15 and the second lug 16 can be installed in the valve body 11 without interfering with the inner wall of the valve body 11, and the same ejector 14 fixing holes are installed on the first lug 15 and the second lug 16, and the positions of the installation holes of the ejector 14 on the first lug 15 and the second lug 16 on the same side correspond to each other, so that the two ends of the ejector 14 are installed in the two installation holes of the ejector 14 on the same side respectively. The ejector rod 14 can be a hydraulic rod, can also be a pneumatic rod, preferably a pneumatic rod, the pneumatic rod can be bi-directional telescopic, and can also be unidirectional telescopic, and only the maximum length of the ejector rod 14 is ensured to be greater than the radial length of the sphere 10, so that the ejector rod can prop open an upstream piston valve seat and a downstream piston valve seat which tightly hold the sphere 10, and a maintainer in the field can take out or put in the sphere 10 conveniently.

Furthermore, the upstream piston valve seat and the downstream piston valve seat have the same structure, only the downstream piston valve seat is provided with a third valve seat 3 in addition, a PCTFE soft sealing valve seat is embedded in an austenitic stainless steel valve seat support ring, and the materials are all suitable for being used under the low-temperature working condition.

As shown in fig. 8, the valve seat of the valve has a piston effect, which is biased by a spring and urged towards the ball 10.

1. When there is upstream pressure of the medium, since D1 is greater than D1, a pressure area Δ P1 is created and the upstream seat pushes against the ball 10, sealing the valve.

2. When the upstream seat has a leak, the media pressure flows to the middle chamber, D3 is greater than D2, creating a pressure area Δ P2, and the downstream seat pushes against the ball 10, sealing the valve.

3. When the pump stops working and the medium has reverse pressure, D2 is larger than D2, pressure area Δ P3 is generated, and the downstream valve seat is also pushed to the ball 10 to seal the valve.

4. When the middle chamber has abnormal pressure of medium expansion, D1 is smaller than D1, pressure area deltaP 1 is generated, and medium pressure pushes away a valve seat to discharge the middle chamber pressure to an upstream pipeline.

In one embodiment, the two outermost edges of the unsealed part of the sphere 10 have cut surfaces 12, the cut surfaces 12 of the two sides of the sphere 10 are symmetrical, and the cut surfaces 12 of the sphere 10 are perpendicular to the direction of the communication ports at the two ends of the sphere 10.

In this embodiment, the two opposite sides of the ball 10 are provided with the communicating openings matched with the valve body 11, the outermost edge of the unsealed part of the ball 10 is the outermost edge perpendicular to the communicating openings in the horizontal direction, the ball 10 with the tangent plane 12 can ensure that the volume of the whole valve can be further reduced, the inner structure of the valve body 11 is more compact, and the space utilization rate in the valve is reasonably improved.

In one embodiment, the middle cavity of the valve body 11 is provided with a yielding recess 18 matched with the ejector rod 14 at a position adjacent to the ejector rod 14 for yielding the ejector rod 14.

In this embodiment, the middle cavity of the valve body 11 has the relief recesses 18 on two sides perpendicular to the flowing direction, the opening position of the relief recess 18 on the valve body 11 matches with the valve rod, and the relief recess 18 is more beneficial for the operation of the maintenance personnel in the field to extend and retract the ejector rod 14 to eject the valve seats on two sides to take out the ball 10.

As shown in fig. 4-6 and fig. 9, in one embodiment, the upstream piston valve seat further includes an annular first valve seat 1, a valve seat mounting groove matched with the first valve seat 1 is formed in a side of the upstream valve seat support ring 4 adjacent to the ball 10, the downstream piston valve seat further includes an annular second valve seat 2 and an annular third valve seat 3, two valve seat mounting grooves with different sizes are formed in a side of the downstream valve seat support ring 7 adjacent to the ball 10 and respectively matched with the second valve seat 2 and the third valve seat 3, one end of the bidirectional wedge-shaped sealing structure adjacent to the ball 10 is abutted and fixed in the valve body 11 through a sealing ring press ring 55, spring holes are formed in ends of the upstream valve seat support ring 4 and the downstream valve seat support ring 7 away from the ball 10, the spring holes are arranged at equal intervals in the circumferential direction of the upstream valve seat support ring 4, and upstream valve seat springs 6 are installed in the spring holes, the spring holes are arranged at equal intervals in the circumferential direction of the downstream valve seat support ring 7, the downstream valve seat springs 9 are arranged in the spring holes, the outer wall of the valve body 11, which is not provided with through holes, is transversely provided with more than two reinforcing ribs 13 which are arranged at intervals in the longitudinal direction, and the tops of the outer walls at two sides of the valve body 11 are respectively provided with lifting lugs 17.

In this embodiment, since the temperature of the valve is from-196 ℃ to normal temperature, the temperature difference of the valve during use is very large, the expansion caused by heat and the contraction caused by cold brought to the whole valve by temperature change will also become larger, and the valve body 11 is provided with the reinforcing ribs 13 transversely on the outer wall provided with the through holes, so as to improve the overall structural strength of the valve and adapt to low-temperature and extreme use scenes.

Preferably, the low-temperature ball valve is designed into a top-mounted structure, and the valve body 11 of the valve is of an integral structure, so that the pipeline tension caused by the temperature difference of a pipeline can be resisted better. The wall thickness of the whole valve shell is increased under the condition of standard wall thickness, and the valve body 11 of the valve is stronger by adding the reinforcing ribs 13.

Preferably, the upstream is designed to be a sealing valve seat and is a single-piston effect valve seat, and the downstream is designed to be a double-piston effect valve seat formed by two sealing valve seats, so that the sealing performance and the safety performance of the valve are guaranteed.

Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A bidirectional wedge-shaped sealing structure is suitable for sealing between a valve seat and a valve body and is characterized by comprising a valve seat sealing ring and a wedge-shaped gasket;

the valve seat sealing ring is annular, opening structures are arranged on two sides of the valve seat sealing ring, and the size of each opening structure is gradually reduced from the two sides of the valve seat sealing ring to the middle of the valve seat sealing ring;

the wedge pad is the annular, the one end of wedge pad for stretching into the end, with open structure phase-match, the other end be the stiff end, be suitable for with the valve body the disk seat is laminated mutually with mounting structure between the two, the quantity of wedge pad is two, follows respectively one of them one side of disk seat sealing washer stretch into extremely in the open structure.

2. The two-way wedge-shaped sealing structure according to claim 1, wherein the inner side wall of the opening structure is an inclined arc-shaped structure and is connected with the bottom arc surface of the opening structure, and the inclined arc-shaped structure and the annular peripheral surface coaxial with the inclined arc-shaped structure form a preset included angle, and the value of the preset included angle is [ 10-20 ° ].

3. The bi-directional wedge seal structure of claim 2, further comprising a resilient fastener;

the wedge-shaped pad on one side is provided with a mounting hole in the direction deviating from the extending end of the wedge-shaped pad, and the mounting hole is matched with the elastic fastener;

the number of the mounting holes is more than two, and the mounting holes are arranged in the circumferential direction of the wedge-shaped pad at equal intervals.

4. The bi-directional wedge seal structure of claim 3, wherein the wedge pads comprise a first wedge pad and a second wedge pad;

the mounting hole is formed in the first wedge-shaped pad;

the thickness of the fixed end of the second wedge-shaped pad towards one side of the ring center is larger than the thickness of the fixed end of the second wedge-shaped pad deviating from one side of the ring center.

5. The bidirectional wedge-shaped sealing structure according to claim 3, wherein the length of the edge of the protruding end of the wedge-shaped pad is consistent with the length of the inclined cambered surface structure, and the head of the protruding end of the wedge-shaped pad is a plane and is smoothly connected with the edge;

the width of the fixed end of the wedge-shaped pad is larger than the maximum width of the extending end.

6. The bi-directional wedge seal structure of claim 3, wherein the valve seat seal ring has a concave arc-shaped surface towards a middle of one side wall of the ring core;

the middle part of the valve seat sealing ring, which is far away from one side wall of the ring core, is provided with the same concave arc-shaped surface.

7. The bi-directional wedge seal structure of any of claims 3-6, wherein the opening structures on both sides of the seat seal are symmetrically disposed;

the preset included angle is 15 degrees;

the number of the mounting holes is even;

the elastic fastener is a spring bolt;

the valve seat sealing ring is made of soft materials;

the wedge-shaped pad is made of metal.

8. A cryostatic ball valve comprising a valve body, a ball, a valve stem, an upstream piston seat, a downstream piston seat, and the bi-directional wedge seal of any one of claims 1-7;

the two opposite ends of the valve body are respectively an upstream end and a downstream end, a through hole is pre-formed and communicated with the middle cavity of the valve body, and a through hole is formed in the upper part of the valve body and communicated with the middle cavity of the valve body;

the top of the ball body is provided with a valve rod mounting hole, and the ball body is arranged in the middle cavity of the valve body;

one end of the valve rod penetrates through the through hole to be detachably connected with the ball body;

the upstream piston valve seat is annular and is arranged in the upstream end of the valve body, and one side of the upstream piston valve seat, which is close to the through hole, is matched with the ball body;

the downstream piston valve seat is annular and is arranged in the downstream end of the valve body, and one side of the downstream piston valve seat, which is close to the through hole, is matched with the ball body;

the two bidirectional wedge-shaped sealing structures are respectively clamped and fixed between the inner wall of the upstream end of the valve body and the upstream piston valve seat and between the inner wall of the downstream end of the valve body and the downstream piston valve seat.

9. The cryostatic ball valve of claim 8, further comprising a stem lift;

an upstream valve seat support ring is arranged in the upstream piston valve seat, first lugs transversely extend towards two sides respectively and are arranged at one end, close to the ball body, in the upstream valve seat support ring, and ejector rod fixing holes are formed in the first lugs;

the downstream piston valve seat comprises a downstream valve seat supporting ring, one end of the downstream valve seat supporting ring, which is adjacent to the ball body, transversely extends to two sides to form second lugs, and the second lugs are provided with the same ejector rod fixing holes;

the top rod has an adjusting stroke at least one end, one end of the top rod of the ball body is fixed in the top rod mounting hole on the first lug, the other end of the top rod of the ball body is fixed in the top rod mounting hole on the second lug, the maximum length of the top rod is larger than the maximum radial length of the ball body, and the distance between the upstream piston valve seat and the downstream piston valve seat can be expanded so as to take out the ball body for disassembly, inspection and maintenance.

10. The cryostatic ball valve as claimed in claim 9, wherein the two outermost edges of the unsealed portion of the ball body have cut surfaces, the cut surfaces of the two sides of the ball body are symmetrical, and the cut surface of the ball body is perpendicular to the direction of the communication ports at the two ends of the ball body;

a yielding recess matched with the ejector rod is arranged at the position, close to the ejector rod, of the middle cavity of the valve body and used for yielding the ejector rod;

the upstream piston valve seat also comprises an annular first valve seat, and a valve seat mounting groove matched with the first valve seat is formed in one side, adjacent to the ball body, of the upstream valve seat support ring;

the downstream piston valve seat also comprises an annular second valve seat and an annular third valve seat, and two valve seat mounting grooves with different sizes are formed in one side, adjacent to the ball body, of the downstream valve seat supporting ring and are respectively matched with the second valve seat and the third valve seat;

one end of the bidirectional wedge-shaped sealing structure, which is adjacent to the ball body, is abutted and fixed into the valve body through a sealing ring pressing ring;

spring holes are formed in the ends, far away from the ball body, of the upstream valve seat support ring and the downstream valve seat support ring, are arranged at equal intervals in the circumferential direction of the upstream valve seat support ring, and upstream valve seat springs are mounted in the spring holes;

the spring holes are arranged at equal intervals in the circumferential direction of the downstream valve seat support ring, and matched downstream valve seat springs are arranged in the spring holes;

lifting lugs are respectively arranged at the tops of the outer walls of the two sides of the valve body;

the outer wall of the valve body, which is not provided with the through hole, is transversely provided with more than two reinforcing ribs which are arranged at intervals along the longitudinal direction.