Anti-crystallization ball valve

Abstract

The utility model discloses an anti-crystallization ball valve which comprises an outer shell, a ball body installed inside the outer shell and a valve rod connected to the ball body, a valve seat for achieving clearance sealing is arranged between the ball body and the outer shell, a lining pipe supported on the inner wall of the valve seat is arranged inside the valve seat, and a lining ring pressed on the outer wall of the valve seat is arranged outside the valve seat. The outer shell, the liner tube, the valve seat and an inner cavity of the ball jointly form a medium flowing channel, the inner wall of the outer shell, the outer wall of the liner tube and one side of the valve seat jointly define a sealing cavity for preventing a medium from entering, an elastic assembly tightly pressed on one side of the valve seat is arranged in the sealing cavity, and the inner wall of the liner tube is coated with a hard alloy coating for preventing the medium from being bonded. The ball valve not only can solve the problem of elasticity failure caused by the fact that crystalline media make contact with the elastic assembly, but also can solve the problem of up-and-down deviation of the valve seat, can improve the sealing performance between the valve seat and the ball body, and prolongs the service life of the ball valve.

Description

TECHNICAL FIELD

[0001] The utility model belongs to valve technical field, especially, relate to a kind of anti-crystallization ball valve.

BACKGROUND

[0002] Ball valve is a kind of open-close element, is rotated around the axis of valve rod by the valve rod and is driven, it is mainly used to do cut-off, distribution and change the flow direction of medium in pipeline, only need to rotate 90 ° and use very small rotation torque can be closed tightly, but when transporting easily solidified, crystallized slurry, slurry is bonded on valve seat, ball and elastic component, it can cause the sealing failure between valve seat and ball, and the problem of internal leakage appears, also can cause elastic component to lose part of rebound force, further cause valve seal failure, in order to solve this problem, the ball valve for crystallization working condition disclosed in Chinese patent authorization announcement No.CN221075321U, the surface of the valve seat and the ball is coated with nano composite coating to prevent medium bonding, the valve seat and the valve cap are provided with cladding spring for sealing, although it can prevent the problem of ball valve crystallization to a certain extent, but the scheme still has the following problems:

[0003] (1) although cladding spring includes external wear-resistant corrosion-resistant sealing layer and internal corrosion-resistant alloy spring, but the inner wall of cladding spring is directly contacted with crystallized liquid and is scoured by crystallized liquid, under the condition of long-term scouring action, cladding spring can lose part of elastic force, further cause the sealing failure between valve seat and ball;

[0004] (2) the surface of valve seat is coated with nano composite coating to prevent medium bonding, but the inner wall of valve seat is directly contacted with crystallized liquid and is scoured by crystallized liquid, under the condition of long-term scouring action, valve seat is easy to move up and down, so as to offset the contact sealing surface with ball, so as to cause the problem of sealing failure leading to internal leakage.

[0005] Therefore, it is necessary to provide an anti-crystallization ball valve to solve the above technical problems.

UTILITY MODEL CONTENTS

[0006] The main purpose of the utility model is to provide an anti-crystallization ball valve, which can not only solve the problem of crystallization medium contacting elastic component and causing its elastic failure, but also solve the problem of valve seat moving up and down, and improve the sealing between valve seat and ball and the service life of ball valve.

[0007] The utility model discloses a kind of anti-crystallization ball valves, it includes outer shell, ball installed in the inside of the outer shell and valve stem connected on the ball, the ball with the outer shell between being provided with the valve seat that realizes gap seal, the valve seat inside is provided with the bushing supported on the inner wall of the valve seat, outside is provided with the bushing ring that is compacted on the outer wall of the valve seat, the inner cavity of the outer shell, the bushing, the valve seat and the ball is jointly formed medium flow channel, the inner wall of the outer shell, the outer wall of the bushing and the valve seat one side jointly form the sealing cavity that prevents medium from entering, the sealing cavity is provided with the elastic component that is compacted on the one side of the valve seat, the inner wall of the bushing is coated with hard alloy coating that prevents medium from bonding.

[0008] Further, the outer shell includes a valve body, a bottom cover disposed at the bottom of the valve body, and a valve cap disposed at one side of the valve body. The bottom cover is provided with a bottom shaft supporting the ball. The ball is installed inside the valve body. The upper end of the valve body is provided with a stuffing box. The stuffing box is provided with a packing for achieving gap sealing between the valve body and the valve stem.

[0009] Further, the valve seat is provided with a first sealing surface on the side facing the ball, a second sealing surface on the side facing the outer shell, and a third sealing surface on the side facing the bushing.

[0010] Further, the first sealing surface is provided with an annular protrusion that first contacts and seals with the ball. The second sealing surface extends out of the inner wall of the outer shell. One end of the second sealing surface contacts and seals with the outer shell, and the other end contacts and seals with the bushing ring. The inner wall of the bushing ring is compacted on the second sealing surface. The second sealing surface and the third sealing surface are both provided with a plurality of first annular accommodation grooves. The first annular accommodation grooves are both provided with a first O-ring for sealing.

[0011] Further, the bushing ring is disposed inside the outer shell through a bolt. The outer wall of the bushing ring is provided with a second annular accommodation groove. The second annular accommodation groove is provided with a second O-ring for sealing between the bushing ring and the outer shell.

[0012] Further, the bushing includes a first limiting surface in contact with the outer shell and extending vertically, a second limiting surface extending horizontally, and a third limiting surface in contact with the third sealing surface and extending horizontally. The second limiting surface and the third limiting surface have a height difference.

[0013] Further, one end of the third limiting surface is in contact with the second sealing surface to realize sealing, and the other end of the third limiting surface, the inner wall of the outer shell, the side wall of the valve seat, and the connecting side wall of the second limiting surface and the third limiting surface jointly form a sealing cavity.

[0014] Further, the elastic assembly includes a first disc spring group and a second disc spring group, and an elastic grommet arranged between the first disc spring group and the second disc spring group, the elastic grommet is sleeved on the third limiting surface of the lining pipe.

[0015] Further, the first disc spring group and the second disc spring group have large elasticity, so that the valve seat can float left and right, thereby being capable of scraping off crystallized medium on the contact surface of the valve seat.

[0016] Further, the first sealing surface of the valve seat, the surface of the ball, and the inner wall and the outer wall of the lining ring are all coated with a hard alloy coating to prevent medium adhesion.

[0017] Compared with the prior art, the beneficial effects of the anti-crystallization ball valve are as follows:

[0018] (1) The other end of the third limiting surface of the lining pipe, the inner wall of the outer shell, the side wall of the valve seat, and the connecting side wall of the second limiting surface and the third limiting surface jointly form a sealing cavity, the elastic assembly is arranged in the sealing cavity, the elastic assembly provides pre-tightening force for the valve seat, the valve seat and the ball realize sealing, a plurality of first O-rings for realizing sealing are arranged on the second sealing surface and the third sealing surface, and the first limiting surface is welded on the outer shell to ensure the sealing property between the outer shell and the lining pipe, thereby ensuring the sealing property in the sealing cavity, medium can be prevented from entering the sealing cavity, the elastic assembly can be prevented from deforming to cause elastic failure, and the sealing property between the valve seat and the ball can be improved.

[0019] (2) The first disc spring group and the second disc spring group have large elasticity, so that the valve seat can float left and right, thereby being capable of scraping off crystallized medium on the contact surface of the valve seat, the sealing property of the sealing cavity can be further ensured, and in the process of left and right movement of the valve seat, the third limiting surface of the lining pipe is supported on the third sealing surface of the valve seat, the inner wall of the lining ring is pressed on the second sealing surface of the valve seat, and the lining pipe and the lining ring clamp the valve seat up and down, the valve seat can be prevented from being deviated up and down, the stability of left and right elastic movement of the valve seat can be ensured, and the valve seat and the ball realize good sealing property.

[0020] (3) The design of the double disc spring group can provide stable pre-tightening force, and the pre-tightening force can be more evenly distributed to ensure the stability of the pre-tightening force during the opening and closing of the ball valve, even if one disc spring group is worn or fatigued and its performance is reduced, the other disc spring group can still provide sufficient pre-tightening force, thereby maintaining the stability of the overall system and prolonging the service life of the ball valve;

[0021] (4) The inner wall of the liner pipe, the first sealing surface of the valve seat, the surface of the ball and the inner wall and outer wall of the liner ring are coated with a hard alloy coating to prevent medium adhesion, so that the easily crystallized and precipitated medium cannot be adhered to the inside of the ball valve, and the problem that the medium crystallizes between the valve seat and the liner ring and the liner pipe to cause the valve seat to be unable to move, thereby leading to the sealing failure or jamming of the ball valve. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a sectional view structure schematic diagram of the anti-crystallization ball valve of the embodiment of the utility model;

[0023] Figure 2 It is a sectional view structure schematic diagram of the anti-crystallization ball valve of the embodiment of the utility model; Figure 1 It is an enlarged structure schematic diagram of the part A in the middle;

[0024] Figures in the drawing represent:

[0025] 100-anti-crystallization ball valve; 101-qualitative flow channel;

[0026] 1-outer shell, 11-valve body, 12-bottom cover, 13-valve cap, 14-bottom shaft, 15-stuffing box, 16-stuffing;

[0027] 2-ball, 3-valve stem;

[0028] 4-valve seat, 41-first sealing surface, 411-annular protrusion, 42-second sealing surface, 43-contact surface, 44-third sealing surface, 45-first annular containing groove, 46-first O-shaped ring;

[0029] 5-liner pipe, 51-first limiting surface, 52-second limiting surface, 53-third limiting surface;

[0030] 6-liner ring, 61-bolt, 62-second annular containing groove, 63-second O-shaped ring;

[0031] 7-sealing cavity;

[0032] 8-elastic assembly, 81-first disc spring group, 82-second disc spring group, 83-elastic grommet.

DETAILED DESCRIPTION

[0033] Please refer to Figures 1-2The embodiment is a kind of anti-crystallization ball valve 100, a kind of anti-crystallization ball valve 100 includes outer shell 1, ball 2 installed in the inside of outer shell 1 and valve stem 3 connected on ball 2, ball 2 and outer shell 1 between being provided with the valve seat 4 for realizing gap sealing, the inside of valve seat 4 is provided with the bushing 5 supported on the inner wall of valve seat 4, the outside is provided with the bushing ring 6 compressed on the outer wall of valve seat 4, the inner cavity of outer shell 1, bushing 5, valve seat 4 and ball 2 jointly form medium flow channel 101, the inner wall of outer shell 1, the outer wall of bushing 5 and the one side of valve seat 4 jointly form the sealing cavity 7 for preventing medium from entering, the elastic component 8 for being compressed on the one side of valve seat 4 is arranged in sealing cavity 7, the inner wall of bushing 5 is coated with hard alloy coating for preventing medium from sticking.

[0034] Outer shell 1 includes valve body 11, bottom cover 12 arranged at the bottom of valve body 11 and valve cap 13 arranged at one side of valve body 11, bottom cover 12 is provided with bottom shaft 14 for supporting ball 2, ball 2 is installed in the inside of valve body 11, the upper end of valve body 11 is provided with stuffing box 15, stuffing box 15 is provided with packing 16 for realizing gap sealing between valve body 11 and valve stem 3.

[0035] Valve seat 4 is provided with first sealing surface 41 for realizing sealing by being in contact with the surface of ball 2 on the side towards ball 2, is provided with horizontal second sealing surface 42 and vertical contact surface 43 on the side towards outer shell 1, is provided with third sealing surface 44 for realizing sealing by being in contact with bushing 5 on the side towards bushing 5.

[0036] In order to improve the sealing effect between valve seat 4 and ball 2, annular protrusion 411 is arranged on first sealing surface 41, ball 2 first contacts and seals annular protrusion 411, after the extrusion force of ball 2 increases, ball 2 will extrude annular protrusion 411 to realize complete contact and sealing with first sealing surface 41, compared with ordinary plane contact, the elastic deformation amount after extrusion can be obviously increased by arranging annular protrusion 411, which improves the sealing effect between valve seat 4 and ball 2, and also enhances the bearing capacity of valve seat 4, thereby reducing the wear of valve seat 4 and prolonging the service life of valve seat 4.

[0037] Second sealing surface 42 extends out of the inner wall of outer shell 1, one end of second sealing surface 42 is in contact and sealed with outer shell 1, the other end is in contact and sealed with bushing ring 6, the inner wall of bushing ring 6 is compressed on second sealing surface 42 to prevent valve seat 4 from moving up and down. Bushing ring 6 is arranged in the inside of outer shell 1 through bolt 61, in order to improve the sealing between bushing ring 6 and outer shell 1, second annular accommodating groove 62 is arranged on the outer wall of bushing ring 6, second O-ring 63 for realizing sealing is arranged in second annular accommodating groove 62, second O-ring 63 can realize the sealing between bushing ring 6 and outer shell 1.

[0038] The lining pipe 5 comprises a first limiting surface 51 in contact with the outer shell 1 and extending vertically, a second limiting surface 52 extending horizontally, a third limiting surface 53 extending horizontally and in contact with the third sealing surface 44 of the valve seat 4 to realize sealing, and a height difference between the second limiting surface 52 and the third limiting surface 53; one end of the third limiting surface 53 is in contact with the second sealing surface 44 to realize sealing, and the other end of the third limiting surface 53, the inner wall of the outer shell 1, the side wall of the valve seat 4, and the connecting side wall of the second limiting surface 52 and the third limiting surface 53 together form a sealing cavity 7, the elastic assembly 8 is arranged in the sealing cavity 7, the elastic assembly 8 provides a pre-tightening force for the valve seat 4, so that the valve seat 4 and the ball 2 realize sealing. In order to avoid the elastic assembly 8 from being invalid due to contacting the medium, it is necessary to ensure the sealing effect in the sealing cavity 7, in order to improve the sealing effect on the second sealing surface 42 and the third sealing surface 44, a plurality of first annular accommodation grooves 45 are arranged on the second sealing surface 42 and the third sealing surface 44, and a first O-ring 46 for realizing sealing is arranged in each first annular accommodation groove 45, which can prevent the medium from entering the sealing cavity 7 from the second sealing surface 42 and the third sealing surface 44, the first limiting surface 51 is welded on the outer shell 1 to ensure the sealing between the outer shell 1 and the lining pipe 5, which can prevent the medium from entering the sealing cavity 7 from the first limiting surface 51, avoid the deformation of the elastic assembly 8 leading to elastic failure, and improve the sealing between the valve seat 4 and the ball 2.

[0039] The elastic assembly 8 comprises a first disc spring set 81 and a second disc spring set 82 and an elastic grommet 83 arranged between the first disc spring set 81 and the second disc spring set 82, the elastic grommet 83 is sleeved on the third limiting surface 53 of the bushing 5, and the stability of the elastic grommet 83 can be ensured. The design of the double disc spring set can provide stable pre-tightening force, the pre-tightening force can be more evenly distributed to ensure the stability of the pre-tightening force in the opening and closing process of the ball valve, even if one of the disc spring sets is degraded due to wear or fatigue, the other disc spring set can still provide sufficient pre-tightening force, so that the stability of the overall system is maintained; the design of the double disc spring set can provide stable pre-tightening force, the disc spring set is designed by using disc springs with large elasticity, so that larger pre-tightening force can be provided, the first disc spring set 81 and the second disc spring set 82 have large elasticity, so that the valve seat 4 can float left and right, thereby the crystallized medium on the contact surface of the valve seat 4 can be scraped off; the disc spring set abuts against the contact surface 43 when being stretched, and the valve seat 4 is pressed to one side of the ball 2, the second sealing surface 42 of the valve seat 4 moves on the inner wall of the outer shell 1, and the third sealing surface 44 moves on the third limiting surface 53 of the bushing 5, so that the crystallized medium on the inner wall of the outer shell 1 and the crystallized medium on the third limiting surface 53 of the bushing 5 are scraped off, and the sealing performance of the sealing cavity 7 can be further ensured. The valve seat 4 is made of rubber material and has elasticity, and in the process of left and right movement of the valve seat 4, the third limiting surface 53 of the bushing 5 supports the third sealing surface 44 of the valve seat 4, the inner wall of the bushing 6 is pressed against the second sealing surface 42 of the valve seat 4, and the bushing 5 and the bushing 6 clamp the valve seat 4 upward and downward, so that the valve seat 4 can be prevented from being deviated upward and downward, the stability of the left and right elastic movement of the valve seat 4 can be ensured, and the valve seat 4 and the ball 2 can achieve good sealing performance.

[0040] Since the medium flowing in the channel 101 can be bonded to the ball valve, the hard alloy that prevents bonding of the medium is coated on the positions where the medium flows or can flow, the hard alloy coating that prevents bonding of the medium is coated on the inner wall of the bushing 5, the first sealing surface 41 of the valve seat 4, the surface of the ball 2 and the inner wall and outer wall of the bushing 6, as shown by the black thick lines in the figure, so that the easily crystallized and precipitated medium cannot be bonded to the inside of the ball valve, and the problem that the valve seat 4 cannot move left and right due to crystallization of the medium between the valve seat and the bushing and the bushing ring, thereby causing sealing failure or jamming of the ball valve, is avoided. Figure 2

[0041] The above only describes some embodiments of the present application. Those skilled in the art can make some modifications and improvements without departing from the inventive concept, and these all belong to the protection scope of the present application.​

Claims

1. A crystallization-proof ball valve, characterized by: It includes an outer shell, a ball installed inside the outer shell, and a valve stem connected to the ball, a gap seal is provided between the ball and the outer shell, a support tube is provided inside the valve seat, a support ring is provided outside the valve seat, the inner cavity of the outer shell, the support tube, the valve seat and the ball forms a medium flow channel, the inner wall of the outer shell, the outer wall of the support tube and one side of the valve seat form a sealed cavity to prevent medium from entering, an elastic component is provided in the sealed cavity, the inner wall of the support tube is coated with a hard alloy coating to prevent medium adhesion.

2. A ball valve to prevent crystallization as claimed in claim 1, characterized in that: The outer shell includes a valve body, a bottom cover provided at the bottom of the valve body, and a valve cap provided at one side of the valve body, a bottom shaft is provided on the bottom cover to support the ball, the ball is installed inside the valve body, the upper end of the valve body is provided with a stuffing box, the stuffing box is provided with a packing to achieve gap sealing between the valve body and the valve stem.

3. A ball valve to prevent crystallization as claimed in claim 1, wherein: The valve seat is provided with a first sealing surface on the side facing the ball, a second sealing surface on the side facing the outer shell, and a third sealing surface on the side facing the support tube.

4. A ball valve to prevent crystallization as claimed in claim 3, wherein: The first sealing surface is provided with an annular protrusion that first contacts and seals with the ball, the second sealing surface extends out of the inner wall of the outer shell, one end of the second sealing surface contacts and seals with the outer shell, and the other end contacts and seals with the support ring, the inner wall of the support ring is pressed against the second sealing surface, the second sealing surface and the third sealing surface are both provided with a plurality of first annular accommodation grooves, and the first O-rings are provided in the first annular accommodation grooves to achieve sealing.

5. A ball valve to prevent crystallization as defined in claim 1, characterized in that: The support ring is provided inside the outer shell by bolts, the second annular accommodation groove is provided on the outer wall of the support ring, and the second O-rings are provided in the second annular accommodation groove to achieve sealing between the support ring and the outer shell.

6. A ball valve to prevent crystallization as defined in claim 3, characterized in that: The support tube includes a first limiting surface in contact with the outer shell and vertically extending, a second limiting surface horizontally extending, and a third limiting surface in contact with the third sealing surface and horizontally extending, and the second limiting surface and the third limiting surface have a height difference.

7. A ball valve to prevent crystallization as claimed in claim 6 wherein: One end of the third limiting surface contacts and seals with the second sealing surface, and the other end of the third limiting surface, the inner wall of the outer shell, the side wall of the valve seat, and the connecting side wall of the second limiting surface and the third limiting surface together form a sealed cavity.

8. A ball valve to prevent crystallization as defined in claim 6, characterized in that: The elastic component includes a first disc spring group and a second disc spring group, and an elastic grommet is provided between the first disc spring group and the second disc spring group, and the elastic grommet is sleeved on the third limiting surface of the support tube.

9. A ball valve to prevent crystallization as claimed in claim 8, characterized in that: The first disc spring group and the second disc spring group have large elasticity, so that the valve seat can float left and right, thereby scraping off the crystalline medium on the contact surface of the valve seat.

10. A ball valve to prevent crystallization as defined in claim 3, characterized in that: The first sealing surface of the valve seat, the surface of the ball and the inner and outer walls of the backing ring are coated with a hard metal coating which prevents the medium from sticking. The first sealing surface of the valve seat, the surface of the ball and the inner and outer walls of the backing ring are coated with a hard metal coating which prevents the medium from sticking.

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