CN217207846U

CN217207846U - Ultra-low temperature top-mounted fixed ball valve

Info

Publication number: CN217207846U
Application number: CN202220645075.5U
Authority: CN
Inventors: 吴钊; 吴程杰; 郝文明; 吴啸; 刘凯; 王奕彤
Original assignee: Founder Valve Group Co ltd
Current assignee: Founder Valve Group Co ltd
Priority date: 2022-03-22
Filing date: 2022-03-22
Publication date: 2022-08-16
Anticipated expiration: 2032-03-22

Abstract

The utility model relates to a ball valve, in particular to an ultra-low temperature top-mounted fixed ball valve, which comprises a valve rod, a valve body, a ball body, a valve seat and an elastic element, wherein the valve seat is provided with a groove which is positioned on the contact surface of the valve seat and the ball body, and a first sealing component is arranged in the groove; the first sealing assembly comprises a wedge block and an elastic sealing ring, the wedge block is fixed on the inner wall of one end, far away from the ball body, of the groove, and the smaller end of the wedge block faces the ball body; the elastic sealing ring is provided with a V-shaped groove, the wedge block is positioned in the V-shaped groove, a cavity is formed between the V-shaped groove and the wedge block, the elastic sealing ring contracts under the low-temperature condition, the valve seat is pushed to the ball body under the action of medium force and the elastic piece, the wedge block fixedly connected with the valve seat is driven to move towards the ball body, when the wedge block moves towards the ball body, the elastic support arm of the elastic sealing ring is extruded by the wedge block to be expanded, extends into the cavity in the groove and the notch groove and is tightly attached to the inner wall of the groove, and the sealing effect is achieved.

Description

Ultra-low temperature top-mounted fixed ball valve

Technical Field

The utility model relates to a ball valve, especially an ultra-low temperature fixed ball valve of upper assembling type.

Background

Liquefied natural gas is natural gas which is compressed and cooled to the condensation point (-161.5 ℃) of the natural gas to be liquid, and because the vaporization temperature of the liquefied natural gas is low, when the temperature is higher than-162 ℃, the volume of the liquefied natural gas can be rapidly expanded, so that the internal pressure of a container for transporting or containing the liquefied natural gas is rapidly increased, and safety hazards are caused, therefore, the liquefied natural gas has high requirements on equipment in the production, storage and transportation processes, wherein an ultralow-temperature ball valve is very important and critical in the equipment for transporting the natural gas although the proportion is not outstanding.

The ultralow temperature top-mounted fixed ball valve has the difficulty that deformation and performance change of materials and structures at low temperature, particularly the shrinkage of the shapes of the materials at low temperature and the hardening of the materials at low temperature are solved, a valve seat part and a valve rod packing sealing part of the valve are used as main dynamic sealing components of the valve, the selection of the materials and the design of the structure are particularly important, and the sealing components are required to keep good sealing performance at normal temperature and ultralow temperature.

The valve seat or the stuffing box of the existing ultralow-temperature top-mounted fixed ball valve mostly adopts common stuffing for sealing, and the aim of low temperature resistance is achieved by adding or changing a sealing ring, but the sealing mode still has the following problems in the ultralow-temperature environment: 1. the sealing ring is easy to shrink at low temperature, so that a tiny gap is formed between the sealing ring and the sealing ring or between the sealing ring and the valve body, and the sealing effect is poor. 2. The sealing ring between the valve seat and the valve body is troublesome to disassemble, and in order not to damage the sealing ring, the sealing ring needs to be disassembled by a special tool. 3. The valve stem is the main stressed component of the valve and the stuffing box is subject to wear from the valve stem, and although the lip ring can perform sealing in most cases, it is difficult to achieve high micro-leakage levels.

Disclosure of Invention

The utility model aims at overcoming the shortcoming and not enough that prior art exists, and provide a sealing performance is good, be convenient for installation and the fixed ball valve of ultra-low temperature upper assembling of dismantlement sealing washer under the low temperature condition.

The utility model discloses the technical scheme who takes as follows: the utility model provides an ultra-low temperature top-mounted fixed ball valve, includes valve rod, valve body, spheroid, disk seat, elastic component, the spheroid is located inside the valve body, the disk seat is located the spheroid with between the valve body, it is right that elastic component is located between valve body and the disk seat forms thrust to the spheroid direction, its characterized in that: a groove is formed in the end face, close to the ball body, of one side of the valve seat, and a first sealing assembly is arranged in the groove; the first sealing assembly comprises a wedge block and an elastic sealing ring, the wedge block is fixed on the inner wall of one end, far away from the ball body, of the groove, and the smaller end of the wedge block faces the ball body; the elastic sealing ring is embedded in the groove, the end face of one side, close to the ball body, of the end portion of the elastic sealing ring, opposite to the valve seat, protrudes to form a first sealing portion, the first sealing portion is in sealing fit with the ball body, a V-shaped groove is formed in one end, far away from the ball body, of the elastic sealing ring, and the wedge block is located in the V-shaped groove and a cavity is formed between the V-shaped groove and the wedge block.

Furthermore, the elastic sealing ring is provided with two elastic support arms far away from one end of the ball body, the V-shaped groove is formed between the two elastic support arms, the inner wall of the groove is a plane, the outer side edge of each elastic support arm is a second sealing portion which is in contact with the inner wall of the groove, and the second sealing portion is a smooth convex curved surface.

Furthermore, a certain distance is reserved between the inner wall of one end, far away from the sphere, of the groove and the end part, far away from the sphere, of the elastic support arm.

Furthermore, the section of the wedge block is isosceles trapezoid and is located at the middle axis position in the groove, and the two elastic support arms of the elastic sealing ring are symmetrically arranged relative to the middle axis of the groove.

Furthermore, the inner wall of the groove far away from one end of the ball body is respectively provided with a first notch at two sides of the wedge block, and the width of the end part of the elastic support arm far away from one end of the ball body is greater than the width of the bottom of the notch.

Furthermore, the upper end face and the lower end face of the elastic sealing ring are provided with third sealing parts which are in contact fit with the inner wall of the groove, the third sealing parts are planes, the third sealing parts are located on one side, close to the ball body, of the second sealing parts, and second notches are formed between the third sealing parts and the second sealing parts.

Further, a second sealing assembly and an elastic retainer ring for a shaft are arranged between the valve seat and the valve body; the second sealing assembly comprises a sealing ring and a sealing ring check ring, the sealing ring check ring is located between the sealing ring and the elastic check ring for the shaft, and the elastic check ring for the shaft is located between the sealing ring check ring and the valve body.

Furthermore, the valve seat is provided with a check ring caulking groove, the upper part of the elastic check ring for the shaft is embedded into the check ring caulking groove, and the lower part of the elastic check ring for the shaft limits the check ring of the sealing ring.

Further, be equipped with the packing box between valve rod and the valve body, the packing box includes that packing presses cover, O type sealing washer, V type packing group, packing spacer ring, gasket, lip seal, packing presses the cover to be located packing box upper portion, and with the valve rod joint, all be equipped with the ring channel on the face that packing presses cover lower extreme and valve rod and valve body contact, O type sealing washer inlay in the ring channel.

Further, the V-shaped packing groups comprise a first V-shaped packing group and a second V-shaped packing group which are oppositely distributed up and down, the first V-shaped packing group is arranged above the second V-shaped packing group, the opening of the first V-shaped packing group is upward, and the opening of the second V-shaped packing group is downward; the packing spacer ring is positioned between the first V-shaped packing group and the second V-shaped packing group, the packing pad is positioned below the second V-shaped packing group, and the lip-shaped sealing ring is positioned at the bottom of the packing box.

The utility model has the advantages as follows: under the condition of low temperature, the elastic sealing ring of the first sealing assembly on the valve seat contracts, the valve seat is pushed to the ball body under the action of medium force and the elastic part, and drives the wedge block fixedly connected with the valve seat to move towards the ball body, the elastic support arms on two sides of the V-shaped groove of the elastic sealing ring expand towards the peripheral cavity due to the extrusion of the wedge block, cling to the inner wall of the groove, and extend towards the notches at the upper end and the lower end of the inner wall of the groove to play a further sealing role, so that the sealing performance of the valve seat at low temperature is ensured.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings obtained from these drawings still belong to the scope of the present invention without inventive laboriousness.

Fig. 1 is the utility model provides a pair of the fixed ball valve of ultra-low temperature upper assembling formula structural schematic diagram.

Fig. 2 is a partially enlarged view of a portion at a position a in fig. 1.

Fig. 3 is a partially enlarged view of fig. 2 at the position C.

Fig. 4 is a cross-sectional view of the elastic sealing ring of the present invention.

Fig. 5 is a partially enlarged view of fig. 1 at the position B.

In the figure: 1 valve rod, 2 valve body, 3 sphere, 4 stuffing boxes, 41 stuffing press sleeves, 411O-shaped sealing rings, 42 stuffing spacer rings, 43V-shaped stuffing groups, 431 first V-shaped stuffing groups, 432 second V-shaped stuffing groups, 44 stuffing pads, 45 lip-shaped sealing rings, 5 valve seats, 51 sealing rings, 52 sealing ring retaining rings, 53 shaft elastic retaining rings, 6 elastic pieces, 7 wedge blocks, 8 elastic sealing rings, 81 elastic support arms, 82 first sealing parts, 83 second sealing parts, 84 third sealing parts, 9 grooves, 91 first grooves and 92 second grooves.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings.

It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it is understood that "first" and "second" are only used for convenience of expression and should not be understood as limitations to the embodiments of the present invention, and the following embodiments do not describe any more.

The terms of direction and position in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., refer to the direction and position of the attached drawings. Accordingly, the directional and positional terms used are intended to illustrate and understand the present invention and are not intended to limit the scope of the invention.

As shown in fig. 1 to 5, an ultra-low temperature top-loading type fixed ball valve includes a valve stem 1, a valve body 2, a ball 3, a valve seat 5, and an elastic member 6, wherein the ball 3 is located inside the valve body 2, the valve seat 5 is located between the ball 3 and the valve body 2, the elastic member 6 is located between the valve body 3 and the valve seat 5 and forms a thrust force to the valve seat 5 in a direction of the ball 3, and is characterized in that: a groove 9 is formed in the end face, close to the ball body 3, of one side of the valve seat 5, and a first sealing assembly is arranged in the groove 9; the first sealing assembly comprises a wedge 7 and an elastic sealing ring 8, the wedge 7 is fixed on the inner wall of one end of the groove 9 far away from the ball 3, and the smaller end of the wedge 7 faces the ball 3; the elastic sealing ring 8 is embedded in the groove 9, the end face of one side, close to the ball body 3, of the end portion of the elastic sealing ring 8, opposite to the valve seat 5, protrudes to form a first sealing portion 82, the first sealing portion 82 is in sealing fit with the ball body 3, a V-shaped groove is formed in one end, far away from the ball body 3, of the elastic sealing ring 8, and the wedge block 7 is located in the V-shaped groove and is provided with a cavity between the V-shaped groove and the V-shaped groove.

The utility model discloses a ball, including elastic sealing ring 8, spheroid 3, the one end of keeping away from of elastic sealing circle 8 is equipped with two elastic support arms 81, and forms between two elastic support arms 81V type groove, the recess 9 inner wall is the plane, the outside edge of elastic support arm 81 is the second sealing 83 that contacts with the recess 9 inner wall, second sealing 83 is smooth convex surface.

The inner wall of the groove 9 far away from one end of the ball body 3 is separated from the end part of the elastic support arm 81 far away from one end of the ball body 3 by a certain distance.

The section of the wedge 7 is isosceles trapezoid and is located at the middle axis position in the groove 9, and the two elastic support arms of the elastic sealing ring 8 are symmetrically arranged relative to the middle axis of the groove 9.

The inner wall of the groove 9 far away from one end of the sphere 3 is respectively provided with a first notch 91 at two sides of the wedge 7, and the width of the end part of the elastic support arm 81 far away from one end of the sphere 3 is larger than the width of the bottom of the notch 91.

The upper end face and the lower end face of the elastic sealing ring 8 are provided with third sealing parts 84 which are in contact fit with the inner wall of the groove 9, the third sealing parts 84 are planes, the third sealing parts 84 are located on one side of the second sealing part 83 close to the ball body, and a second notch 92 is formed between the second sealing part 83 and the ball body.

Under the condition of low temperature, the elastic sealing ring 8 contracts, the valve seat 5 is pushed to the sphere 3 under the action of medium force and the elastic element 6, and drives the wedge 7 fixedly connected with the valve seat 5 to move towards the sphere 3, when the wedge 7 moves towards the sphere 3, the elastic support arms 81 at two sides of the V-shaped groove of the elastic sealing ring 8 are expanded towards the peripheral cavity due to the extrusion of the wedge surface of the wedge 7, cling to the inner wall of the groove 9, and extend towards the first notch 91 at the inner wall of the groove 9 to play a further sealing role, in the embodiment, the elastic element is a spring, and a person skilled in the art can select other types of elastic elements according to actual conditions.

A second sealing assembly and a shaft elastic retainer ring 53 are arranged between the valve seat 5 and the valve body 2; the second sealing assembly comprises a sealing ring 51 and a sealing ring retainer ring 52, the sealing ring retainer ring 52 is located between the sealing ring 51 and the shaft circlip 53, the shaft circlip 53 is located between the sealing ring retainer ring 52 and the valve body 2, the sealing ring 51 is a lip-shaped sealing ring in the embodiment, and a person skilled in the art can select other types of sealing rings according to actual conditions.

The valve seat 5 is provided with a retainer ring caulking groove, the upper part of the shaft circlip 53 is embedded into the retainer ring caulking groove, the lower part of the shaft circlip 53 limits the seal ring retainer ring 52, the seal ring 51 and the valve seat 2 can be detached simultaneously during detachment and installation, and the seal ring retainer ring 52 can be taken out only by detaching the shaft circlip 53 during detachment of the seal ring retainer ring 52.

A packing box 4 is arranged between the valve rod 1 and the valve body 2, and the packing box 4 comprises a packing pressing sleeve 41, an O-shaped sealing ring 411, a V-shaped packing group 43, a packing spacer ring 42, a packing pad 44 and a lip-shaped sealing ring 45

The packing pressing sleeve 41 is positioned on the upper part of the packing box 4 and is clamped with the valve rod 1, annular grooves are formed in the surfaces, contacting the valve rod 1 and the valve body 2, of the lower end of the packing pressing sleeve 41, and the O-shaped sealing rings 411 are embedded in the annular grooves to play a sealing role.

The V-shaped packing groups 43 comprise a first V-shaped packing group 431 and a second V-shaped packing group 432 which are oppositely distributed up and down, the first V-shaped packing group 431 is arranged above the second V-shaped packing group 432, the first V-shaped packing group 431 is opened upwards, and the second V-shaped packing group 432 is opened downwards; the packing spacer ring 42 is positioned between the first V-shaped packing group 431 and the second V-shaped packing group 432, the packing pad 44 is positioned below the second V-shaped packing group 432, and the lip-shaped sealing ring 45 is positioned at the bottom of the stuffing box 4; the packing pad 44 and the V-shaped packing group 43 are matched to form a V-shaped sealing surface, so that the sealing force of packing can be increased, the shrinkage of a sealing material at low temperature can be compensated, and the valve can have higher micro-leakage grade by matching the V-shaped packing group 43 with the O-shaped sealing ring 411.

It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.

Claims

1. The utility model provides an ultra-low temperature top-mounted fixed ball valve, includes valve rod (1), valve body (2), spheroid (3), disk seat (5), elastic component (6), spheroid (3) are located inside valve body (2), disk seat (5) are located spheroid (3) with between valve body (2), it is right that elastic component (6) are located between valve body (2) and disk seat (5) form the thrust to spheroid (3) direction, its characterized in that: a groove (9) is formed in the end face, close to the sphere (3), of one side of the valve seat (5), and a first sealing assembly is arranged in the groove (9); the first sealing assembly comprises a wedge block (7) and an elastic sealing ring (8), the wedge block (7) is fixed on the inner wall of one end, away from the ball body (3), of the groove (9), and the smaller end of the wedge block (7) faces the ball body (3); the elastic sealing ring (8) is embedded in the groove (9), the end face of one side, close to the ball body (3), of the end portion of the elastic sealing ring, opposite to the valve seat (5), protrudes to form a first sealing portion (82), the first sealing portion (82) is in sealing fit with the ball body (3), a V-shaped groove is formed in one end, far away from the ball body (3), of the elastic sealing ring (8), and the wedge block (7) is located in the V-shaped groove and a cavity is formed between the V-shaped groove and the V-shaped groove.

2. An ultra-low temperature top-loading fixed ball valve as claimed in claim 1, wherein: elastic seal circle (8) are kept away from spheroid (3) one end and are equipped with two elasticity support arm (81), and form between two elasticity support arm (81) V type groove, recess (9) inner wall is the plane, the outside edge of elasticity support arm (81) is second sealing (83) that contact with recess (9) inner wall, second sealing (83) are smooth convex surface.

3. An ultra-low temperature top-loading fixed ball valve as claimed in claim 2, wherein: the inner wall of one end of the groove (9) far away from the sphere (3) is separated from the end part of one end of the elastic support arm (81) far away from the sphere (3) by a certain distance.

4. An ultra-low temperature top-loading fixed ball valve as claimed in claim 2, wherein: the section of the wedge block (7) is isosceles trapezoid and is positioned at the middle shaft position in the groove (9), and the two elastic support arms (81) of the elastic sealing ring (8) are symmetrically arranged relative to the middle shaft of the groove (9).

5. An ultra-low temperature top-loading type fixed ball valve as claimed in claim 2 or 3, wherein: the inner wall of one end, far away from the sphere (3), of the groove (9) is provided with first notches (91) on two sides of the wedge block (7), and the width of the end part, far away from the sphere (3), of the elastic support arm (81) is larger than that of the bottom of each notch (91).

6. An ultra-low temperature top-loading fixed ball valve as claimed in claim 2, wherein: the upper end face and the lower end face of the elastic sealing ring (8) are provided with a third sealing part (84) which is in contact fit with the inner wall of the groove (9), the third sealing part (84) is a plane, the third sealing part (84) is positioned on one side of the second sealing part (83) close to the ball body, and a second notch (92) is formed between the second sealing part and the second sealing part.

7. An ultra-low temperature top-loading fixed ball valve as claimed in claim 1, wherein: a second sealing assembly and an elastic retaining ring (53) for a shaft are arranged between the valve seat (5) and the valve body (2); the second sealing assembly comprises a sealing ring (51) and a sealing ring retainer ring (52), the sealing ring retainer ring (52) is located between the sealing ring (51) and the shaft circlip (53), and the shaft circlip (53) is located between the sealing ring retainer ring (52) and the valve body (2).

8. An ultra-low temperature top-loading fixed ball valve as claimed in claim 7, wherein: the valve seat (5) is provided with a check ring embedding groove, the upper part of the elastic check ring (53) for the shaft is embedded into the check ring embedding groove, and the lower part of the elastic check ring (53) for the shaft limits the check ring (52).

9. An ultra-low temperature top-loading fixed ball valve as claimed in claim 1, wherein: be equipped with packing box (4) between valve rod (1) and valve body (2), packing box (4) are including packing press sleeve (41), O type sealing washer (411), V type packing group (43), packing spacer ring (42), packing pad (44), lip seal (45), packing press sleeve (41) to be located packing box (4) upper portion, and with valve rod (1) joint, all be equipped with the ring channel on the face that packing press sleeve (41) lower extreme and valve rod (1) and valve body (2) contacted, O type sealing washer (411) inlay in the ring channel.

10. An ultra-low temperature top-loading fixed ball valve as claimed in claim 9, wherein: the V-shaped packing groups (43) comprise a first V-shaped packing group (431) and a second V-shaped packing group (432) which are oppositely distributed up and down, the first V-shaped packing group (431) is arranged above the second V-shaped packing group (432), the first V-shaped packing group (431) is opened upwards, and the second V-shaped packing group (432) is opened downwards; the packing spacer ring (42) is located between the first V-shaped packing group (431) and the second V-shaped packing group (432), the packing pad (44) is located below the second V-shaped packing group (432), and the lip-shaped sealing ring (45) is located at the bottom of the packing box (4).