CN112253787A - High-frequency wear-resistant ball valve - Google Patents

Abstract

The invention is mainly suitable for the field of wear-resistant working conditions requiring high-frequency switches in petrochemical industry, coal chemical industry, silicon industry and the like, and particularly discloses a high-frequency wear-resistant ball valve which comprises a valve body, a ball body arranged in a valve cavity of the valve body, a valve cover fixed on the upper side of the valve body, and a valve rod, wherein the bottom end of the valve rod penetrates through an inner hole of the valve cover and then is inserted into the valve cavity and connected with the ball body, the valve rod is coaxially connected with the ball body through three cylindrical pins which are symmetrically distributed along the axis center of the valve rod, and the upper end and the lower end of each cylindrical pin. According to the invention, three cylindrical pins which are uniformly distributed around the axis of the valve rod and the sphere at 120 degrees and are in gapless connection with the valve rod and the sphere are adopted between the valve rod and the sphere, so that the connection strength of the valve rod and the sphere can be ensured, the inevitable connection gap caused by flat square connection or key connection of the valve rod and the sphere is eliminated, the valve rod and the sphere are in surface-to-surface contact through the cylindrical pins, and the impact fatigue deformation is effectively reduced in the high-frequency switching process.

Description

High-frequency wear-resistant ball valve

Technical Field

The invention relates to the technical field of ball valves, in particular to a high-frequency wear-resistant ball valve.

Background

In recent years, petrochemical industry, coal chemical industry, silicon industry and the like are in a rapid development trend, and with the development of various new technologies and the progress of process technologies, the performance requirement of a valve on the harsh working condition of a process device is higher and higher. The performance state of the high-frequency wear-resistant ball valve under the most severe working conditions is a bottleneck limiting the production efficiency of the process devices.

Taking a polyolefin plant in petrochemical industry as an example, in an ethylene petrochemical plant, the polyolefin plant is a key process plant which is mainly used for realizing the solid polyolefin by the slurry raw material and gas phase reaction. In the device, the most important is a high-frequency valve of an automatic control Product Discharge System (PDS), and the performance state of the high-frequency valve directly influences the operation period of the whole device. Therefore, in order to meet the production requirement and ensure smooth production, the working condition of the device requires that the service life of the high-frequency valve is longer than one million times, and the valve needs to be opened or closed within 2.5S. The medium contains gas-solid two-phase materials of PE powder and PP powder, so that the valve needs to meet the working condition of high-frequency use and also needs to have wear resistance.

The high-frequency valve applied to such working conditions in the market at present mainly has the following defects: firstly, the dustproof effect is poor, and the valve is easy to be stuck by self-gathering due to liquid-phase, gas-phase and granular PP/PE powder medium, so that the valve is ineffective; secondly, the valve seat and the coating are damaged due to high switching frequency, and then the sealing is failed and leaked; thirdly, the high-frequency switch of the valve can cause the fatigue deformation of the valve rod, particularly the failure of the connection transmission of the valve rod and the ball body; fourthly, due to high-frequency opening, an actuator bracket of the valve is fixed on the valve cover, and the sealing performance of the valve can be failed due to vibration generated by the valve after long-term operation. The failures not only can cause the short service life of the high-frequency valve and require the process device to be frequently stopped and replaced, but also can cause unsmooth production and seriously affect the economic benefit of production enterprises.

Disclosure of Invention

The invention aims to: the high-frequency wear-resistant ball valve solves the technical defects that a valve rod is fatigue-deformed due to high-frequency switching of the valve, and particularly, the connection transmission between the valve rod and a ball body is failed. The ball valve designed by the invention is mainly suitable for the field of wear-resistant working conditions requiring high-frequency switches, such as petrochemical industry, coal chemical industry, silicon industry and the like.

The technical scheme adopted by the invention is as follows:

the high-frequency wear-resistant ball valve comprises a valve body, a ball body arranged in a valve cavity of the valve body, a valve cover fixed on the upper side of the valve body and a valve rod of which the bottom end penetrates through an inner hole of the valve cover, then the valve rod is inserted into the valve cavity and connected with the ball body, the valve rod is coaxially connected with the ball body through cylindrical pins, the number of the cylindrical pins is three, the cylindrical pins are distributed along the axis of the valve rod in a central symmetry mode, and the upper end and the lower end of each cylindrical pin are.

Furthermore, an installation hole with an axis coinciding with the axis of the valve rod is formed in the ball body, the bottom end of the valve rod is inserted into the installation hole, the outer wall of the valve rod is attached to the hole wall of the installation hole, the cylindrical pin is located between the valve rod and the installation hole, one side, close to the axis of the valve rod, of the cylindrical pin is inserted into the valve rod, and the other side of the cylindrical pin is inserted into the hole wall of the installation hole.

Furthermore, a strip-shaped slot A with an open end at the bottom end and a strip-shaped slot B with an open end at the top end are respectively arranged at one end of the cylindrical side wall of the valve rod, which is close to the ball body, and the hole wall of the mounting hole, the extension directions of the strip-shaped slot A and the strip-shaped slot B are both parallel to the axis of the valve rod, the cross sections of the strip-shaped slot A and the strip-shaped slot B are both a section of constant diameter circular arc, the strip-shaped slot A and the strip-shaped slot B are respectively provided with three strip-shaped slots A and three strip-shaped slots B;

one side of the cylindrical pin, which is close to the axis of the valve rod, is respectively inserted into one strip-shaped slot A, the other side of the cylindrical pin is respectively inserted into one strip-shaped slot B, and two sides of the cylindrical side wall of the cylindrical pin are respectively attached to the slot wall of the strip-shaped slot A and the slot wall of the strip-shaped slot B.

Furthermore, the circle centers of the equal-diameter arcs are all located on the circumference of the cylindrical side wall of the valve rod, which is provided with the strip-shaped slot A.

Further, the strip-shaped slot A and the strip-shaped slot B corresponding to the strip-shaped slot A are assembled to form a circular hole.

Furthermore, the valve rod is in running fit with an inner hole of the valve cover through an upper bearing, and an inner ring and an outer ring of the upper bearing are respectively attached to the valve rod and the inner hole of the valve cover;

the bottom of the valve body is provided with a lower valve rod coaxial with the valve rod, the bottom of the ball body is provided with a lower mounting hole, the top end of the lower valve rod penetrates through the lower side of the valve body and then is inserted into the lower mounting hole and is in rotating fit with the lower mounting hole through a lower bearing, and the inner ring and the outer ring of the lower bearing are respectively attached to the lower valve rod and the inner hole of the lower mounting hole;

and the side wall of the bottom end of the lower valve rod protrudes outwards to form a connecting flange, and the connecting flange is fixed on the valve body through a threaded fastener.

Furthermore, a radial hole communicated with the valve cavity is formed in the position, located between the bottom of the ball body and the inner wall of the valve body, of the lower valve rod, an axial hole is formed in the lower valve rod, the top end of the axial hole is communicated with the radial hole, the bottom end of the axial hole is communicated with the outside, and a screw plug is connected to the bottom end of the axial hole in a threaded mode.

Furthermore, one end of the fluid passage of the valve body, which is close to the valve cavity, is matched with the ball body through a dustproof valve seat structure, and a valve seat mounting hole which is coaxial with the fluid passage and has a hole diameter larger than that of the fluid passage is arranged on the fluid passage;

dustproof disk seat structural installation is in the disk seat mounting hole, and it includes the spring and is annular spring holder and disk seat, spheroidal one end butt is kept away from with the disk seat mounting hole to the one end of spring holder, and its other end is provided with the spring mounting hole, the one end and the spheroid contact of disk seat, the inner circle of its other end extend and cover the spring holder to keeping away from spheroidal one end, and the outer lane of this extension and fluid passage's wall laminating, the spring is arranged in the spring mounting hole, its both ends respectively with the hole bottom and the disk seat butt of spring mounting hole.

Furthermore, the valve cover is of a long-neck structure, a neck inner hole and the valve rod are in rotary sealing fit through a neck sealing assembly, an axial bearing step is arranged at the upper end of the neck inner hole, the neck sealing assembly comprises a gasket, a packing pressing ring, a disc spring and a packing gland, the bearing step is sequentially sleeved on the valve rod upwards, the gasket, the packing pressing ring, the disc spring and the packing gland are axially pressed on the bearing step through a pressing bolt, the bottom end of the packing pressing ring, the gasket and the packing are located in the neck inner hole, the top end of the packing pressing ring, the disc spring and the packing gland are located on the outer side of the neck inner hole, and the;

all be provided with annular sealing washer mounting groove on the inner wall and the outer wall of packing clamping ring bottom, install interior sealing washer and external seal circle in the sealing washer mounting groove in the inside and outside respectively, the inside and outside circle of interior sealing washer is laminated with valve rod and the sealing washer mounting groove tank bottom that corresponds respectively, the interior outer lane of external seal circle is laminated with the sealing washer mounting groove tank bottom and the neck hole that correspond respectively.

Further, the valve body is divided into a left valve body and a right valve body by intersecting the valve cavity and being perpendicular to the plane of the flowing direction of the fluid channel of the valve body, the left valve body is connected with the right valve body into a whole through a transverse connecting piece, the transverse connecting piece comprises a screw rod and a nut, one end of the screw rod is connected with the left valve body, and the other end of the screw rod is in threaded connection with the nut after penetrating through the right valve body.

Due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. according to the high-frequency wear-resistant ball valve, the three cylindrical pins which are uniformly distributed at 120 degrees around the axis of the valve rod and the ball body and are in gapless connection with the valve rod and the ball body are adopted between the valve rod and the ball body, so that the connection strength of the valve rod and the ball body can be ensured, the inevitable connection gap caused by flat square connection or key connection of the valve rod and the ball body is eliminated, the valve rod and the ball body are in surface-to-surface contact through the cylindrical pins, and the impact fatigue deformation is effectively reduced in the high-frequency switching process;

2. the invention relates to a high-frequency wear-resistant ball valve, which is characterized in that three cylindrical pins are uniformly distributed at 120 degrees around the axis of a valve rod or a ball body, and in a plane perpendicular to the axis of the valve rod or the ball body, the axes of the three cylindrical pins, the axis of the valve rod and the axis of the ball body are all projected to form points, three points projected by the axes of the three cylindrical pins are connected to form an equilateral triangle, so that based on the fact that one triangle has a uniquely determined circumscribed circle (three points determine one circle), the circle center of the circumscribed circle of the equilateral triangle is the intersection point of perpendicular bisectors of all sides of the equilateral triangle, the distances from the three vertexes of the equilateral triangle are equal, and the circle centers of the circumscribed circle are uniformly distributed at 120 degrees around the axis of the valve rod or the ball body, so that the circle centers of; when the valve rod and the ball body are matched with the three-cylinder pin, the projection point of the axis of the valve rod is coincided with the center of the external circle, and the projection point of the axis of the ball body is coincided with the center of the external circle, so that the projection point of the axis of the valve rod is coincided with the projection point of the axis of the ball body, the concentricity of the valve rod and the ball body after the assembly is well guaranteed, the high-frequency switch of the ball valve is facilitated, and the switch of the ball valve is smoother;

3. according to the high-frequency wear-resistant ball valve, the valve rod and the ball body are positioned at multiple points, and the impact on the connecting part between the valve rod and the valve ball during high-speed and high-frequency operation is equally divided through each point, so that the situation that the valve switch position is staggered due to overlarge impact on the connecting part between the valve rod and the valve ball during high-speed and high-frequency operation is avoided;

4. according to the high-frequency wear-resistant ball valve, the upper end of the cylindrical pin is matched with the valve rod to position the central point of the cylindrical pin in distribution to be coincident with the axis of the valve rod, the lower end of the cylindrical pin is matched with the ball body to position the central point of the cylindrical pin in distribution to be coincident with the axis of the ball body, and one side of the cylindrical pin, facing the axis of the valve rod, and one side of the cylindrical pin, far away from the axis of the valve rod are respectively matched with the valve rod and the ball body to ensure the coax. Specifically, in addition to the positioning of the valve rod and the ball body by the upper end and the lower end of the cylindrical pin, the valve rod and the ball body are simultaneously positioned on the same cylindrical pin around the inner side and the outer side of the cylindrical side wall of the axis of the same cylindrical pin, so that the structures matched with the cylindrical side wall on the valve rod and the ball body are also rotating surfaces around the cylindrical pin, the rotating axis of the valve rod matched with the same cylindrical pin and the rotating axis of the part matched with the cylindrical pin on the ball body are taken as the axis of the cylindrical pin, and finally, the parts matched with the cylindrical pin on the valve rod and the ball body are not only distributed around the respective axes in a central symmetry manner, but also are symmetrical around the cylindrical pin on the parts matched with the same cylindrical pin on the valve rod and the ball body, so that the concentricity of the assembled valve rod and the assembled with the ball body;

5. according to the high-frequency wear-resistant ball valve, the valve cover, the valve rod and the lower valve rod are designed by the double bearings, so that the stability of the valve rod is ensured, and the phenomena of fatigue bending and deformation blocking of the valve rod caused by high-frequency action of the valve are avoided; the valve rod and the lower valve rod which are positioned above and below the ball body can be radially positioned at the end parts through the bearings, so that the coaxiality of the valve rod and the lower valve rod is ensured; meanwhile, two bearings are arranged between the valve cover and the valve rod, so that the rotating stability of the valve rod is ensured, the valve rod and the valve cover are always ensured to have good concentricity, and the fatigue deformation of the valve rod in the high-frequency opening and closing process of the valve due to the accumulated tolerance factor after assembly is avoided;

6. in order to prevent the ball valve from generating adverse conditions such as pressure extrusion deformation, the high-frequency wear-resistant ball valve is preferably provided with a channel for pressure relief based on a lower valve rod: a radial bore and an axial bore; when the valve cavity needs to be decompressed, the valve cavity can be decompressed quickly by opening the screw plug, so that the ball valve is protected, and the adverse conditions such as deformation caused by high pressure and the like are prevented; more importantly, when the ball valve is in an open or closed position, fluid media at the upstream and downstream are completely sealed and isolated by the ball body, namely, the upstream and downstream flow channels are isolated from the middle cavity (the cavity between the valve body and the ball body), when the valve is fully opened or fully closed and the upstream and downstream pipelines have pressure, the plug screw can be opened at the moment, dirt in the middle cavity is removed, whether the valve seat has leakage is checked, and valve rod packing, other sealing elements and the like are replaced on line after the plug screw is opened to relieve pressure, so that the function of on-line maintenance is achieved;

7. according to the high-frequency wear-resistant ball valve, the inner ring at one end of the valve seat extends towards one end far away from the ball body and covers the spring seat, so that a cavity formed by the extending end of the valve seat and the valve body can completely wrap the spring and the spring seat, the spring seat and the spring can be isolated from a medium containing particles flowing in the ball valve, solid particles in fluid can be effectively prevented from entering the spring seat, the valve seat structure has a very good dustproof function, and the service life of the valve is prolonged;

8. according to the high-frequency wear-resistant ball valve, the disc spring between the packing gland and the packing compression ring can provide self-compensation pressing force for packing, and double sealing is performed by combining graphite packing, so that the problem of failure of high-frequency sealing of the packing is solved, and the ball valve is very suitable for being used under the working conditions of high wear and high frequency switching of the ball valve;

9. according to the high-frequency wear-resistant ball valve, the mounting bracket of the actuator is directly designed and fixed on the valve body through the socket head cap screws, so that the mounting end of the actuator and the valve cover are mutually independent, and when the valve is opened and closed at high frequency, periodic high-frequency impact force generated by the actuator is directly applied to the valve body instead of the valve cover with the precisely matched sealing stuffing box, so that the sealing performance of the valve is not influenced;

10. according to the high-frequency wear-resistant ball valve, the surface treatment of the ball body and the valve seat adopts a method of overlaying a hardened layer, so that the surfaces of the ball body and the valve seat form an ultra-thick hardened layer, the binding force with a matrix is high, the high-frequency wear-resistant ball valve is suitable for being used under a high-wear working condition, and the problem that the hardened layer is easy to wear through and fall off is solved;

11. according to the high-frequency wear-resistant ball valve, the valve rod is made of high-strength bidirectional stainless steel, the problem of fatigue failure of the valve rod caused by high-frequency opening and closing of the valve is solved, the surface hardening treatment of the valve rod improves the smoothness and the wear resistance of the valve rod, and the friction force between the valve rod and the filler when the valve is opened is reduced, so that the service life of the filler is prolonged.

Drawings

In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings needed to be used in the embodiment will be briefly described below, and it should be understood that the proportional relationship of each component in the drawings in this specification does not represent the proportional relationship in the actual material selection design, and is only a schematic diagram of the structure or the position, in which:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view of the engagement between the valve stem and the ball;

FIG. 3 is a schematic view of the mating structures at the valve stem and bonnet;

FIG. 4 is a schematic view of the structure at the lower stem;

FIG. 5 is a schematic view of a dust seat construction;

fig. 6 is a schematic view of the carriage mounting of the actuator.

Reference numerals in the drawings indicate:

1-valve body, 2-ball body, 3-lower bearing, 4-lower valve stem, 5-right valve body, 6-valve seat, 7-graphite packing, 8-O-shaped ring A, 9-spring, 10-spring seat, 11-O-shaped ring B, 12-O-shaped ring C, 13-valve cover, 14-cylindrical pin, 15-valve stem, 16-upper bearing, 17-second upper bearing, 18-packing, 19-packing gland, 20-disc spring, 21-packing ring, 22-inner sealing ring, 23-outer sealing ring, 24-bracket, 25-inner hexagonal screw, 26-valve cavity, 27-strip slot, 28-mounting hole, 29-strip slot B, 30-lower mounting hole, 31-radial hole, 32-axial hole, 33-screw plug, 34-fluid channel, 35-valve seat mounting hole, 36-spring mounting hole, 37-gasket, 38-compression bolt, 39-bearing step, 40-left valve body, 41-screw rod and 42-nut.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

The present invention will be described in detail with reference to fig. 1 to 6.

Example 1

As shown in fig. 1, the high-frequency wear-resistant ball valve of the present invention comprises a valve body 1, a ball body 2 disposed in a valve cavity 26 of the valve body 1, a valve cover 13 fixed on the upper side of the valve body 1, and a valve rod 15 having a bottom end inserted into the valve cavity 26 after passing through an inner hole of the valve cover 13 and connected with the ball body 2, wherein the valve rod 15 is coaxially connected with the ball body 2 through three cylindrical pins 14, the three cylindrical pins 14 are symmetrically distributed along the axis center of the valve rod 15, and the upper and lower ends of the cylindrical pins 14 are respectively inserted into the ball body 2 and the valve rod 15.

In the prior art, when the valve rod and the ball body are connected in a flat square mode or in a key connection mode, a connection gap inevitably exists, and power impact from an actuator can be generated due to the existence of the connection gap in the high-frequency switching process of the ball valve, so that the connection part between the valve rod and the ball body is impacted and subjected to fatigue deformation. Specifically, in the whole rotating process, based on the connecting gap, when the valve rod is driven, the valve rod is only contacted with the sphere through the line or the line on the key at the flat corner part, and then the sphere is stirred to rotate through the line, namely, in the switching process, the valve rod is in line contact with the sphere, and the connecting transmission of the valve rod and the sphere is failed due to the fact that the contact part is in the working condition of repeated switching for a long time and is easy to fatigue and deform.

Based on the situation, three cylindrical pins which are uniformly distributed at 120 degrees around the axes of the valve rod 15 and the sphere 2 and are in gapless connection with the valve rod 15 and the sphere 2 are adopted between the valve rod 15 and the sphere 2, so that the connection strength of the valve rod and the sphere can be ensured, the inevitable connection gap caused by flat square connection or key connection of the valve rod and the sphere is eliminated, the valve rod and the sphere are in surface-to-surface contact through the cylindrical pins 14, and the impact fatigue deformation is effectively reduced in the high-frequency switching process.

Meanwhile, the precision of one device is limited not only by the machining precision of the device but also by the assembly precision in the later period. In the invention, the valve rod and the structure matched with the cylindrical pin on the ball body are processed with high precision, and three cylindrical pins are adopted for assembly in later assembly, so that the coaxiality of the valve rod and the ball body which are connected with each other through the cylindrical pins can be ensured. Specifically, in the invention, three cylindrical pins are uniformly distributed at 120 degrees around the axis of a valve rod or a sphere, and in a plane perpendicular to the axis of the valve rod or the sphere, the axes of the three cylindrical pins, the axis of the valve rod and the axis of the sphere are all projected as points, and the three points projected by the axes of the three cylindrical pins are connected to form an equilateral triangle, so that based on the fact that one triangle has a uniquely determined circumcircle (three points determine one circle), the circle center of the circumcircle of the regular triangle is the intersection point of the perpendicular bisectors of all sides of the regular triangle, and the distances from the three vertexes of the triangle are equal, and because the three cylindrical pins are uniformly distributed at 120 degrees around the axis of the valve rod or the sphere, the circle center of the circumcircle is superposed with the projection points of the axes of the valve rod; when the valve rod and the ball body are matched with the three cylindrical pins, the projection point of the axis of the valve rod coincides with the center of the external circle, and the projection point of the axis of the ball body coincides with the center of the external circle, so that the projection point of the axis of the valve rod coincides with the projection point of the axis of the ball body, the concentricity of the valve rod and the ball body after the assembly is well guaranteed, the high-frequency switch of the ball valve is facilitated, and the switch of the ball valve is smoother.

Meanwhile, the valve rod and the ball body are positioned at multiple points, and the impact on the connecting part between the valve rod and the valve ball during high-speed and high-frequency operation is equally divided through each point, so that the situation that the connecting part between the valve rod and the valve ball is too large in impact force during high-speed and high-frequency operation to cause the dislocation of the valve switch position is avoided.

Example 2

This embodiment is further described with respect to the fitting structure between the valve stem and the ball in embodiment 1.

As shown in the figure, a mounting hole 28 with the axis coinciding with the axis of the valve rod 15 is arranged on the sphere 2, the bottom end of the valve rod 15 is inserted into the mounting hole 28, the outer wall of the valve rod 15 is attached to the hole wall of the mounting hole 28, the cylindrical pin 14 is positioned between the valve rod 15 and the mounting hole 28, one side of the cylindrical pin close to the axis of the valve rod 15 is inserted into the valve rod 15, and the other side of the cylindrical pin is inserted into the hole wall of the mounting hole 28.

In the invention, not only the upper end of the cylindrical pin is matched with the valve rod 15 to position the central point of the cylindrical pin distribution to coincide with the axis of the valve rod 15, but also the lower end of the cylindrical pin is matched with the ball to position the central point of the cylindrical pin distribution to coincide with the axis of the ball 2, and one side of the cylindrical pin facing to the axis of the valve rod (hereinafter, referred to as the inner side of the cylindrical pin) and one side of the cylindrical pin far away from the axis of the valve rod (hereinafter, referred to as the outer side of the cylindrical pin) are respectively matched with the valve rod. Specifically, except for the positioning of the upper end and the lower end of the cylindrical pin on the valve rod and the ball body, the valve rod and the ball body are simultaneously positioned on the same cylindrical pin around the inner side and the outer side of the cylindrical side wall of the axis of the same cylindrical pin, so that the structures matched with the cylindrical side wall of the valve rod and the ball body are also rotating surfaces around the cylindrical pin, the rotating axis of the valve rod matched with the same cylindrical pin and the rotating axis of the part matched with the cylindrical pin on the ball body are the axis of the cylindrical pin, and finally, the parts matched with the cylindrical pin on the valve rod and the ball body are not only symmetrically distributed around the respective axes, and the parts matched with the same cylindrical pin on the valve rod and the ball body are also symmetrical around the axis of the cylindrical pin, so that the concentricity of the assembled valve rod and the assembled with the ball body is improved, the high.

The matching structure between the inner side and the outer side of the cylindrical pin and the valve rod and the ball body is as follows:

as shown in fig. 2, in the present invention, a strip-shaped slot a27 with an open bottom end and a strip-shaped slot B29 with an open top end are respectively arranged on one end of the cylindrical side wall of the valve rod 15 close to the ball 2 and on the hole wall of the mounting hole 28, the extending directions of the strip-shaped slot a27 and the strip-shaped slot B29 are both parallel to the axis of the valve rod 15, and the cross sections thereof are both a section of circular arc with equal diameter, three strip-shaped slots a27 and three strip-shaped slots B29 are both symmetrically distributed along the axis center of the valve rod 15, and the strip-shaped slots a27 and the strip-shaped slots B29 are in one-;

one side of the cylindrical pin 14 close to the axis of the valve rod 15 is inserted into one strip-shaped slot a27, the other side of the cylindrical pin is inserted into one strip-shaped slot B29, and two sides of the cylindrical side wall of the cylindrical pin 14 are respectively attached to the groove wall of the strip-shaped slot a27 and the groove wall of the strip-shaped slot B29, as shown in fig. 2.

Preferably, the centers of the equal-diameter circular arcs are all located on the circumference of the cylindrical side wall of the valve rod 15 provided with the strip-shaped slot A27.

Preferably, the strip-shaped slot a27 and the strip-shaped slot B29 corresponding thereto form a circular hole.

Example 3

The embodiment is optimized and explained about the stability of the working state of the valve rod in the invention.

In the invention, as shown in fig. 1, the valve rod 15 is rotationally matched with the inner hole of the valve cover 13 through an upper bearing 16, and the inner ring and the outer ring of the upper bearing 16 are respectively attached to the valve rod 15 and the inner hole of the valve cover 13;

as shown in fig. 1 and 4, a lower valve rod 4 coaxial with a valve rod 15 is arranged at the bottom of the valve body 1, a lower mounting hole 30 is arranged at the bottom of the ball body 2, the top end of the lower valve rod 4 penetrates through the lower side of the valve body 1 and then is inserted into the lower mounting hole 30, and is rotatably matched with the lower mounting hole 30 through a lower bearing 3, and the inner ring and the outer ring of the lower bearing 3 are respectively attached to the lower valve rod 4 and the inner hole of the lower mounting hole 30;

the side wall of the bottom end of the lower valve rod 4 protrudes outwards to form a connecting flange, and the connecting flange is fixed on the valve body 1 through a threaded fastener.

Preferably, a second upper bearing 17 is provided on the upper bearing 16, and the inner ring and the outer ring of the second upper bearing are respectively attached to the valve rod 15 and the inner hole of the valve cover 13. In order to facilitate the mounting of the upper bearing 16 and the second upper bearing 17, the valve cover is of an elongated neck structure.

The valve cover 13, the valve rod 15 and the lower valve rod 4 adopt a double-bearing design, so that the stability of the valve rod is ensured, and the phenomena of fatigue bending, deformation and blockage of the valve rod caused by high-frequency action of the valve are avoided; the valve rod 15 and the lower valve rod 4 which are positioned on the upper part and the lower part of the sphere can be positioned in the end radial direction through bearings, and the coaxiality of the valve rod 15 and the lower valve rod 4 is ensured. Simultaneously, set up two bearings between valve gap 13 and the valve rod 15, its purpose is to ensure the pivoted stability of valve rod 15, ensures that valve rod and valve gap have good concentricity all the time, avoids because the factor of the accumulative tolerance after the assembly leads to the fatigue deformation of valve rod among the valve high frequency opening and closing process.

Further, a radial hole 31 communicated with the valve cavity 26 is arranged on the lower valve rod 4 between the bottom of the ball 2 and the inner wall of the valve body 1, an axial hole 32 is arranged on the lower valve rod 4, the top end of the axial hole is communicated with the radial hole 31, the bottom end of the axial hole 32 is communicated with the outside, and a screw plug 33 is connected to the bottom end of the axial hole 32 in a threaded manner.

Preferably, a lower shaft sleeve is arranged between the lower valve rod 4 and the valve body 2, and the inner ring and the outer ring of the lower shaft sleeve are respectively attached to the lower valve rod 4 and the valve body.

Preferably, an electrostatic spring is arranged between the lower valve rod and the ball body, and static electricity accumulated on the valve ball is sequentially conducted to the valve rod, the valve body support and the ground through the electrostatic spring.

When the ball is in the closed position or the open position, the valve cavity is in a state of being cut off and not communicated with the fluid channel 34 of the valve body, and in the process of closing the ball valve or opening the ball valve, the fluid channel 34 is communicated with the valve cavity through an intermediate channel for circulating fluid on the ball body, so that the valve cavity is filled with fluid; therefore, when the ball is in the closed position or the open position, the valve cavity is closed and filled with fluid, when the cavity has abnormal high pressure, the pressure difference between the inside and the outside of the valve cavity is very large, and can reach dozens of megapascals at most, in order to prevent the ball valve from generating adverse conditions such as pressure extrusion deformation, a channel for pressure relief is preferably arranged on the basis of the lower valve rod 4: a radial hole 31 and an axial hole 32; when the pressure of the valve cavity is required to be relieved, the screw plug 33 is opened, so that the pressure of the valve cavity can be quickly relieved, the ball valve is protected, and the adverse conditions such as deformation due to high pressure are prevented.

More importantly, when the ball valve is in an opening or closing position, fluid media in the upstream and downstream are completely sealed and isolated by the ball body, namely, the upstream and downstream flow channels are isolated from the middle cavity (the cavity between the valve body and the ball body), when the valve is fully opened or fully closed and the upstream and downstream pipelines are pressurized, the plug screw can be opened at the moment, dirt in the middle cavity is removed, whether the valve seat leaks or not is checked, and valve rod packing, other sealing elements and the like are replaced on line after the plug screw is opened to relieve pressure, so that the function of online maintenance is achieved.

Example 4

This embodiment is described with respect to a valve seat for supporting a ball.

The existing ball valve used for medium containing particles is not ideal in dustproof structure on the valve seat, and particularly fine powder particles contained in fluid medium are easily accumulated at a valve body step in the using process, and the fine powder particles can still drill into a spring seat under the application of high-frequency working conditions, so that the function of the spring is failed, and the sealing is failed and leaked.

In order to solve the above problems, in the present invention, as shown in fig. 1 and 5, one end of the fluid passage 34 of the valve body 1 close to the valve cavity 26 is matched with the ball 2 through a dustproof valve seat structure, and a valve seat mounting hole 35 which is coaxial with the fluid passage 34 and has a larger hole diameter than the fluid passage 34 is arranged on the fluid passage 34;

dustproof valve seat structure installs in disk seat mounting hole 35, and it includes spring 9 and is annular spring holder 10 and disk seat 7, the one end butt of spheroid 2 is kept away from with disk seat mounting hole 35 to the one end of spring holder 10, and its other end is provided with spring mounting hole 36, the one end and the spheroid 2 contact of disk seat 7, the inner circle of its other end extend and cover spring holder 10 to the one end of keeping away from spheroid 2, and the outer lane of this extension and the wall laminating of fluid passage 34, spring 9 is arranged in spring mounting hole 36, its both ends respectively with the hole bottom of spring mounting hole 36 and disk seat 7 butt.

The inner circle of the one end of disk seat 7 extends and covers spring holder 10 to the one end of keeping away from spheroid 2 to make the cavity that disk seat 7 extension end and valve body 1 constitute can wrap up spring 9 and spring holder 10 completely, thereby will can be isolated with spring holder 10 and spring 9 and circulation contain the granule medium in the ball valve, can prevent effectively that the solid particle thing in the fluid from getting into the spring holder the inside, make the disk seat structure have very good dustproof function, thereby the life of extension valve.

Preferably, the valve seat 7 is provided with a scraper structure, and the scraper structure has the function of self-cleaning the spherical surface during the opening process of the ball valve.

Preferably, the spring mounting holes 36 are plural and are uniformly distributed along the circumferential direction of the spring seat 10.

Preferably, a graphite packing and two O-rings A8 embedded in the outer circular surface of the valve seat 7 are sequentially sleeved on the outer circular surface of the valve seat 7 close to the ball 2 along with the distance from the ball 2, and the outer ring of the O-ring A8 is attached to the hole wall of the valve seat mounting hole 35; an O-shaped ring B11 and an O-shaped ring C12 which are embedded into the spring seat 10 are sleeved on the outer circular surface and the inner circular surface of the spring seat 10, the inner ring of the O-shaped ring B11 is attached to the outer circle of the extending end of the valve seat 7 in an attaching mode, and the outer ring of the O-shaped ring C12 is attached to the valve seat mounting hole 35 in an attaching mode.

The seal of graphite packing department is mainly used for preventing fires, and O shape circle A8 is the main seal of valve seat, mainly used seal chamber pressure, and O shape circle B11 mainly is the seal between valve seat extension end and the spring holder, prevents that the granule from getting into spring mounting hole 36.

Example 5

The present embodiment is described with respect to the sealing structure between the bonnet and the valve stem in the present invention.

The valve cover 13 is of a long-neck structure, a neck inner hole and the valve rod 15 are in rotary sealing fit through a neck sealing assembly, an axial bearing step 39 is arranged at the upper end of the neck inner hole, the neck sealing assembly comprises a gasket 37, a packing 18, a packing press ring 21, a disc spring 20 and a packing gland 19, the bearing step 39 is sequentially sleeved on the valve rod 15 upwards, the gasket 37, the packing 18, the packing press ring 21 and the packing 18 are axially pressed on the bearing step 39 through a pressing bolt 38, the bottom end of the packing press ring 21, the gasket 37 and the packing 18 are located in the neck inner hole, the top end of the packing press ring 21, the disc spring 20 and the packing gland 19 are located on the outer side of the neck inner hole, and the pressing bolt;

all be provided with annular sealing washer mounting groove on the inner wall and the outer wall of packing clamping ring 21 bottom, install interior sealing washer 22 and outer seal ring 23 respectively in the sealing washer mounting groove in the inside and outside, the interior, the outer lane of interior sealing washer 22 laminate with valve rod 15 and the sealing washer mounting groove tank bottom that corresponds respectively, the interior outer lane of outer seal ring 23 laminate with the sealing washer mounting groove tank bottom and the neck hole that correspond respectively.

Preferably there are two disc springs 20.

The inner and outer sealing rings are preferably both O-ring seals.

The packing press ring 21 is provided with an inner sealing ring and an outer sealing ring, so that on one hand, the packing press ring and the packing can play a role in double sealing, and on the other hand, external dust can be effectively prevented from entering the packing box to influence the service life of the valve.

The disc spring 20 between the packing gland 19 and the packing pressure ring 21 can provide self-compensating pressing force for packing, and is combined with graphite packing double sealing, the problem of sealing failure of the packing caused by high-frequency switching is solved, and the ball valve is very suitable for being used under the working conditions of high abrasion and high-frequency switching of the ball valve.

Example 6

In the present embodiment, the structure of the valve body 1 is explained based on the above-described embodiments.

As shown in fig. 1, in the present invention, the valve body 1 is divided into a left valve body 40 and a right valve body 5 by a plane intersecting with the valve cavity and perpendicular to the flow direction of the fluid passage 34, the left valve body 40 is connected with the right valve body 5 into a whole by a transverse connecting member, the transverse connecting member comprises a screw rod 41 and a nut 42, one end of the screw rod 41 is connected with the left valve body 40, and the other end thereof penetrates through the right valve body 5 and then is connected with the nut 42 by a screw thread.

Example 7

The driving device drives the upper valve rod 15 to drive the ball body 2 to rotate so as to realize flow channel switching, specifically, a mounting bracket 24 of the actuator is directly designed and fixed on the valve body 1 through an inner hexagon screw 25, as shown in fig. 6, so that the mounting end of the actuator and the valve cover 13 are mutually independent, when the valve is opened and closed at high frequency, periodic high-frequency impact force generated by the actuator is directly applied to the valve body 1 instead of the valve cover 13 with a precisely matched sealing stuffing box, and the sealing performance of the valve is not influenced.

Example 8

The present embodiment is further optimized and explained on the basis of the above embodiments.

The surface treatment of the ball body and the valve seat adopts a method of overlaying a hardened layer, so that the surfaces of the ball body and the valve seat form an ultra-thick hardened layer, the binding force with a base body is high, the ball body and the valve seat are suitable for being used under a high-abrasion working condition, and the problem that the hardened layer is easy to wear through and fall off is solved.

The build-up hardened layer is specifically as follows: the method of plasma surfacing of the hardened layer on the metal substrate of the ball body and the valve seat enables the surfaces of the ball body and the valve seat to form the super-thick hardened layer, the hard alloy and the substrate are completely fused, the bonding force is high, the porosity reaches 0%, the method is suitable for use under high-abrasion working conditions, the problem that the hardened layer is easy to wear through and fall off is solved, and the sealing grade reaches ANSI FCI/70-2 ClassVI and even zero leakage.

Preferably, the valve body is made of forged steel.

The valve rod is made of high-strength bidirectional stainless steel, the problem of valve rod fatigue failure caused by high-frequency switching of the valve is solved, the surface hardening treatment of the valve rod improves the smoothness and the wear resistance of the valve rod, and the friction force between the valve rod and the filler when the valve is opened is reduced, so that the service life of the filler is prolonged.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. The utility model provides a wear-resisting ball valve of high frequency, includes valve body (1), arranges spheroid (2) in valve body (1) valve chamber (26), fixes valve gap (13) and the bottom of valve body (1) upside and passes valve gap (13) and insert valve chamber (26) after the hole of valve gap (13) and valve rod (15) be connected with spheroid (2), its characterized in that: the valve rod (15) is coaxially connected with the ball body (2) through the cylindrical pins (14), the number of the cylindrical pins (14) is three, the cylindrical pins are distributed symmetrically along the axis center of the valve rod (15), and the upper end and the lower end of each cylindrical pin (14) are respectively inserted into the ball body (2) and the valve rod (15).

2. The high-frequency wear-resistant ball valve according to claim 1, wherein: the ball body (2) is provided with a mounting hole (28) with the axis coincident with that of the valve rod (15), the bottom end of the valve rod (15) is inserted into the mounting hole (28), the outer wall of the valve rod is attached to the hole wall of the mounting hole (28), the cylindrical pin (14) is located between the valve rod (15) and the mounting hole (28), one side of the cylindrical pin, close to the axis of the valve rod (15), is inserted into the valve rod (15), and the other side of the cylindrical pin is inserted into the hole wall of the mounting hole (28).

3. The high-frequency abrasion-resistant ball valve according to claim 2, wherein: a strip-shaped slot A (27) with an open end at the bottom end and a strip-shaped slot B (29) with an open end at the top end are respectively arranged at one end of the cylindrical side wall of the valve rod (15) close to the sphere (2) and on the hole wall of the mounting hole (28), the extension directions of the strip-shaped slot A (27) and the strip-shaped slot B (29) are both parallel to the axis of the valve rod (15), the cross sections of the strip-shaped slot A (27) and the strip-shaped slot B (29) are both a section of equal-diameter circular arc, the strip-shaped slot A (27) and the strip-shaped slot B (29) are three and are symmetrically distributed along the axis center of the valve rod (15), and the strip-shaped;

one side of the cylindrical pin (14) close to the axis of the valve rod (15) is respectively inserted into one strip-shaped slot A (27), the other side of the cylindrical pin is respectively inserted into one strip-shaped slot B (29), and two sides of the cylindrical side wall of the cylindrical pin (14) are respectively attached to the slot wall of the strip-shaped slot A (27) and the slot wall of the strip-shaped slot B (29).

4. A high-frequency abrasion-resistant ball valve according to claim 3, wherein: the circle centers of the equal-diameter circular arcs are all positioned on the circumference of the cylindrical side wall of the valve rod (15) provided with the strip-shaped slot A (27).

5. A high-frequency abrasion-resistant ball valve according to claim 3, wherein: the strip-shaped slot A (27) and the corresponding strip-shaped slot B (29) form a circular hole in a splicing mode.

6. The high-frequency wear-resistant ball valve according to claim 1, wherein: the valve rod (15) is in running fit with an inner hole of the valve cover (13) through an upper bearing (16), and an inner ring and an outer ring of the upper bearing (16) are respectively attached to the valve rod (15) and the inner hole of the valve cover (13);

the bottom of the valve body (1) is provided with a lower valve rod (4) coaxial with the valve rod (15), the bottom of the ball body (2) is provided with a lower mounting hole (30), the top end of the lower valve rod (4) penetrates through the lower side of the valve body (1) and then is inserted into the lower mounting hole (30) and is in running fit with the lower mounting hole (30) through a lower bearing (3), and the inner ring and the outer ring of the lower bearing (3) are respectively attached to the lower valve rod (4) and the inner hole of the lower mounting hole (30);

the side wall of the bottom end of the lower valve rod (4) protrudes outwards to form a connecting flange, and the connecting flange is fixed on the valve body (1) through a threaded fastener.

7. The high-frequency abrasion-resistant ball valve according to claim 6, wherein: the lower valve rod (4) is provided with a radial hole (31) communicated with the valve cavity (26) at a position between the bottom of the ball body (2) and the inner wall of the valve body (1), the lower valve rod (4) is provided with an axial hole (32) with the top end communicated with the radial hole (31) and the bottom end communicated with the outside, and the bottom end of the axial hole (32) is in threaded connection with a screw plug (33).

8. The high-frequency wear-resistant ball valve according to claim 1, wherein: one end of a fluid passage (34) of the valve body (1), which is close to the valve cavity (26), is matched with the ball body (2) through a dustproof valve seat structure, and a valve seat mounting hole (35) which is coaxial with the fluid passage (34) and has a hole diameter larger than that of the fluid passage (34) is arranged on the fluid passage (34);

dustproof valve seat structure installs in disk seat mounting hole (35), and it includes spring (9) and is annular spring holder (10) and disk seat (7), the one end butt of spheroid (2) is kept away from with disk seat mounting hole (35) to the one end of spring holder (10), and its other end is provided with spring mounting hole (36), the one end and spheroid (2) contact of disk seat (7), the inner circle of its other end extend and cover spring holder (10) to the one end of keeping away from spheroid (2), and the outer lane of this extension and the wall laminating of fluid passage (34), spring (9) are arranged in spring mounting hole (36), and its both ends respectively with the hole bottom of spring mounting hole (36) and disk seat (7) butt.

9. The high-frequency wear-resistant ball valve according to claim 1, wherein: the valve cover (13) is of a long-neck structure, a neck inner hole and the valve rod (15) are in rotary sealing fit through a neck sealing assembly, an axial bearing step (39) is arranged at the upper end of the neck inner hole, the neck sealing assembly comprises a bearing step (39), a gasket (37), a packing (18), a packing press ring (21), a disc spring (20) and a packing gland (19) are sequentially sleeved on the valve rod (15) upwards and are axially pressed on the bearing step (39) through a pressing bolt (38), the bottom end of the packing press ring (21), the gasket (37) and the packing (18) are located in the neck inner hole, the top end of the packing press ring (21), the disc spring (20) and the packing gland (19) are located outside the neck inner hole, and the pressing bolt (38) penetrates through the outer circumferential side of the packing gland (19) and then is in threaded connection with the valve cover (13);

all be provided with annular sealing washer mounting groove on the inner wall and the outer wall of packing clamping ring (21) bottom, install interior sealing washer (22) and external seal circle (23) respectively in the sealing washer mounting groove in the inside and outside, the interior, outer lane of interior sealing washer (22) laminate with valve rod (15) and the sealing washer mounting groove tank bottom that corresponds respectively, the interior outer lane of external seal circle (23) laminate with the sealing washer mounting groove tank bottom and the neck hole that corresponds respectively.

10. The high-frequency wear-resistant ball valve according to claim 1, wherein: the valve body (1) is divided into a left valve body (40) and a right valve body (5) by intersecting with the valve cavity and perpendicular to the plane of the flow direction of a fluid passage (34) of the valve body, the left valve body (40) is connected with the right valve body (5) into a whole through a transverse connecting piece, the transverse connecting piece comprises a screw rod (41) and a nut (42), one end of the screw rod (41) is connected with the left valve body (40), and the other end of the screw rod is in threaded connection with the nut (42) after penetrating through the right valve body (5).

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