CN113932033A

CN113932033A - Ball valve

Info

Publication number: CN113932033A
Application number: CN202111165060.5A
Authority: CN
Inventors: 洪志同; 洪志福; 孔德宝; 洪诗凡; 洪诗宇; 杨世良
Original assignee: Shenyang Taike Fluid Control Co ltd
Current assignee: Shenyang Taike Fluid Control Co ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2022-01-14

Abstract

The utility model belongs to the technical field of boiler drainage ball valve technique and specifically relates to a ball valve is related to, include: a valve seat and a ball; wherein the ball body is abutted against the valve seat; the valve seat and the ball are both formed of cemented carbide. In the ball valve that this application provided, the spheroid all adopts carbide material with the disk seat for the hardness of the sealed face between spheroid and the disk seat reaches more than HRC78, owing to be different from the coating structure that sets up in the past, and then solved under high temperature, the high pressure operating mode, sealed easy the pulling and the scheduling problem that drops of face, improved the life and the ability of resistance to wear of valve.

Description

Ball valve

Technical Field

The utility model belongs to the technical field of boiler drainage ball valve technique and specifically relates to a ball valve is related to.

Background

The boiler water supply drainage ball valve is called as a boiler drainage ball valve, is in butt welding connection and has a straight-through structure, zero leakage of spherical seal, high-pressure self-sealing, caliber DN15-50 and pressure PN20-32.0MPa, is used for high-temperature, high-pressure and high-solid content media, and comprises a valve used for drainage of a power plant, petrochemical industry and mining industry, drainage of a boiler, drainage of a steam engine, drainage of a boiler fixed-row continuous drainage water system, drainage of a steam pocket, drainage of a superheater, isolation of a soot blower, isolation of a bypass pipeline and drainage of a coal economizer header.

At present, the sealing surface process between the valve seat and the ball body in the valve mainly comprises the following steps: the plasma powder spray welding stellite alloy and supersonic flame spraying technology has the advantages that the working condition of the valve is extremely harsh, the hardness of a sealing surface of the plasma powder spray welding is low (HRC38-HRC55), the valve is easy to wear and tear in use, although the hardness of the supersonic flame spraying is high and can reach HRC68-HRC72, a spraying layer is thin (0.3mm), the bonding strength is low compared with welding, the valve is easy to fall off under the impact of a high-temperature and high-pressure medium, if the sealing surface of a ball body and a valve seat is damaged in actual use, serious inner leakage and blocking phenomena can be caused, steam loss of a factory can be caused by the inner leakage of the valve, economic benefit is influenced, the inner leakage is serious, even downstream equipment can be damaged, and the system is stopped.

Disclosure of Invention

An object of this application is to provide a ball valve, has solved the technical problem of the hydrophobic ball valve of boiler that a kind of valve seal face that exists is difficult for droing, firm and stand wear and tear among the prior art to a certain extent.

The application provides a ball valve, include: a valve seat and a ball; wherein the ball abuts against the valve seat;

the valve seat and the ball are both formed of cemented carbide.

In the above technical solution, further, the sealing surfaces of the valve seat and the ball, which are in contact with each other, are rough sealing surfaces formed by directional grinding.

In any of the above technical solutions, further, the cemented carbide is a tungsten-cobalt cemented carbide.

In any of the above technical solutions, further, the cemented carbide is formed by powder metallurgy sintering.

In any of the above technical solutions, further, the ball valve further includes a valve body, the valve body is formed with an installation space penetrating through both side portions thereof along a length direction thereof, and the valve seat is disposed in the installation space;

the valve body is formed of heat resistant steel.

In any of the above technical solutions, further, the valve body is formed of astm a182F92 heat-resistant steel;

the wall thickness of the valve body is 39.5 mm.

In any of the above technical solutions, further, the ball valve further includes a valve stem, a pressing member, a fastening bolt, a fastening nut, an elastic member, and a dynamic sealing member assembly; one end of the valve rod penetrates through the valve body and is connected with the ball body;

the pressing component and the dynamic sealing assembly are sleeved outside the valve rod; the valve body is provided with an installation groove, and the dynamic sealing assembly is pressed in the installation groove by the pressing member along the height direction of the valve rod;

the fastening bolt is sequentially in threaded connection with the pressing component and the valve body; the fastening nut is in threaded connection with one end, far away from the valve body, of the fastening bolt, and the fastening bolt is locked through the fastening nut; the elastic member is disposed between the fastening nut and the pressing member.

In any of the above technical solutions, further, the elastic member is a disc spring.

In any of the above technical solutions, further, the number of the fastening bolts, the fastening nuts, and the elastic members is four, and the fastening bolts, the fastening nuts, and the elastic members are in one-to-one correspondence;

the four fastening bolts are uniformly distributed on the pressing component.

In any of the above technical solutions, further, the ball valve is provided with a high-temperature wear-resistance test device, which includes a box body, a heating member, an air source, and a force application member; wherein the force application member is detachably connected with the valve rod; the interior of the box body is used for placing a part of structure of the ball valve;

the box body is provided with a through hole for penetrating the force application component, and a dynamic sealing component is arranged between the force application component and the side wall of the through hole; the heating component is arranged in the box body, the air source is arranged outside the box body, and the air source is communicated with the inside of the box body through a pipeline.

Compared with the prior art, the beneficial effect of this application is:

in the ball valve that this application provided, the spheroid all adopts carbide material with the disk seat for the hardness of the sealed face between spheroid and the disk seat reaches more than HRC78, owing to be different from the coating structure that sets up in the past, and then solved under high temperature, the high pressure operating mode, sealed easy the pulling and the scheduling problem that drops of face, improved the life and the ability of resistance to wear of valve.

Drawings

In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural diagram of a ball valve provided in an embodiment of the present application;

FIG. 2 is another schematic structural diagram of a ball valve provided in an embodiment of the present application;

FIG. 3 is a cross-sectional view taken along section A-A of FIG. 2;

FIG. 4 is an enlarged schematic view of FIG. 3 at B;

FIG. 5 is a schematic view of a portion of a ball valve provided in accordance with an embodiment of the present application;

fig. 6 is a schematic structural diagram of a valve seat provided in an embodiment of the present application.

Reference numerals:

1-valve body, 2-valve seat, 201-first sealing surface, 3-ball, 4-thrust bearing seat, 5-disc spring, 6-transition sleeve, 7-spiral retainer ring, 8-side tube, 9-anti-extrusion ring, 10-annular packing, 11-valve rod cylindrical pin, 12-thrust bearing, 13-anti-flying sleeve, 14-handle, 15-handle cylindrical pin, 16-fixed sleeve, 17-bracket, 18-inner hexagonal screw, 19-positioning pin, 20-fastening nut, 21-fastening bolt, 22-elastic member, 23-pressing member, 231-circular pressing plate, 232-pressing cylinder and 24-valve rod.

Detailed Description

The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments.

The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application.

All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Ball valves according to some embodiments of the present application are described below with reference to fig. 1-6.

Referring to fig. 4 to 6, an embodiment of the present application provides a ball valve including: a valve seat 2 and a ball 3; the ball 3 abuts against the valve seat 2, wherein preferably, one side of the ball 3 abuts against the valve seat 2, and the two are adapted to each other, specifically, a shallow limiting groove is formed on one side of the valve seat 2 close to the ball 3, one side of the ball 3 is disposed in the limiting groove and adapted to the limiting groove, and a sealing surface is formed at a contact portion of the two, specifically, a surface of the valve seat 2 contacting the ball 3 is a first sealing surface 201, the first sealing surface 201 is an annular arc-shaped surface, a surface of the ball 3 contacting the valve seat 2 is a second sealing surface, and the second sealing surface is a partial surface of the ball 3, wherein the first sealing surface 201 and the second sealing surface are adapted to each other, and the sealing surfaces are formed together;

the valve seat 2 and the ball 3 are both formed of cemented carbide.

Based on the above description, the ball 3 and the valve seat 2 are made of hard alloy materials, so that the hardness of the sealing surface between the ball 3 and the valve seat 2 reaches above HRC78, and due to the fact that the hard alloy valve is different from the traditional coating structure, the problems that the sealing surface is easy to be scratched and fall off under the working conditions of high temperature and high pressure are solved, and the service life and the abrasion resistance of the valve are improved.

In one embodiment of the present application, the sealing surfaces of the valve seat 2 in contact with the ball 3 are preferably rough sealing surfaces formed by directional grinding.

In this embodiment, the sealing surfaces that contact between the valve seat 2 and the ball 3, that is, the first sealing surface 201 and the second sealing surface, are all directionally ground by using carborundum, so that the sealing is more consistent, the sealing performance is improved, and zero leakage of the ball valve is achieved.

In one embodiment of the present application, the cemented carbide is preferably a tungsten-cobalt based cemented carbide.

In the embodiment, the tungsten-cobalt hard alloy has high hardness and high wear resistance, so that the tungsten-cobalt hard alloy is extremely suitable for being applied to high-temperature and high-pressure working conditions and can prolong the service life and improve the wear resistance of the valve.

Among them, it is preferable to use YG5 and YG6 in the tungsten-cobalt cemented carbide, but the cemented carbide is not limited thereto and is selected according to actual needs.

Wherein, preferably, disk seat 2 and spheroid 3 are all by powder metallurgy sintering forming, also promptly through powder metallurgy integral type sintering forming, overall structure is stable, and is not fragile, and the shaping is convenient.

In one embodiment of the present application, preferably, as shown in fig. 4, the ball valve further includes a valve body 1, the valve body 1 is formed with an installation space penetrating both side portions thereof in a length direction thereof, and a valve seat 2 is disposed in the installation space; the valve body 1 is formed of heat-resistant steel.

In this embodiment, the main body of the ball valve, that is, the valve body 1, is made of heat-resistant steel, and can cope with high temperatures of 500 ℃ and above, so that the ball valve is suitable for operation in a high-temperature environment, and the stability and reliability of the operation of the ball valve are ensured.

The valve body 1 is preferably made of astm a182F92 heat-resistant steel, but it is not limited thereto and may be selected according to actual needs.

In one embodiment of the present application, the wall thickness of the valve body 1 is preferably 39.5mm, as shown in fig. 4.

In the embodiment, the design of 39.5mm of super-large wall thickness is adopted, so that the ball valve has super-long service life.

In one embodiment of the present application, preferably, as shown in fig. 2 to 5, the ball valve further includes a valve stem 24, a pressing member 23, a fastening bolt 21, a fastening nut 20, an elastic member 22, and a dynamic seal member assembly; wherein, one end of the valve rod 24 passes through the valve body 1 and is connected with the ball body 3;

the pressing component 23 and the dynamic sealing component are sleeved outside the valve rod 24; the valve body 1 is provided with an installation groove, and the dynamic sealing assembly is pressed in the installation groove by a pressing member 23 along the height direction of the valve rod 24;

the fastening bolt 21 is sequentially screwed to the pressing member 23 and the valve body 1; the fastening nut 20 is screwed to one end of the fastening bolt 21 away from the valve body 1, and the fastening bolt 21 is locked via the fastening nut 20; the elastic member 22 is disposed between the fastening nut 20 and the pressing member 23.

Preferably, the dynamic seal assembly comprises annular packing 10 and an anti-extrusion ring 9 which are sequentially sleeved outside the valve rod 24, wherein the anti-extrusion ring 9 is pressed on the bottom wall of the mounting groove of the valve body 1, the number of the annular packing 10 is multiple, the annular packing 10 is sequentially sleeved on the valve rod 24 and is pressed above the anti-extrusion ring 9 in the mounting groove by a pressing member 23, and the packing is worn in the process of using the valve, namely the valve rod 24 rotates repeatedly.

Preferably, the elastic member 22 is a disc spring, and the disc spring can bear a great load in a small space, so as to meet the requirements of installation space and the borne load.

Wherein, preferably, pressing and establishing the component 23 including the circular clamp plate 231 that is connected and pressing and establishing cylinder 232, pressing and establishing cylinder 232 and setting up the central point department of putting at circular clamp plate 231, and circular clamp plate 231 and the central point department of putting of pressing and establishing cylinder 232 all seted up the through-hole for wear to establish valve rod 24, fastening bolt 21 wears to establish on circular clamp plate 231, presses and establishes cylinder 232 and will move seal assembly and press and establish in the mounting groove of valve body 1.

In the embodiment, the elastic member 22 such as a disc spring is arranged between the dynamic seal assembly and the pressing member 23 such as a gland, and by applying small pre-tightening force of the spring, the sealing state of the valve is continuously maintained when the packing of the dynamic seal assembly is worn, the torque required by the operation of the valve is not increased, the service life of the valve is prolonged, and the maintenance cost of the valve is reduced.

In one embodiment of the present application, preferably, as shown in fig. 5, the number of the fastening bolts 21, the fastening nuts 20, and the elastic members 22 is four, and they correspond to one another;

the four fastening bolts 21 are uniformly distributed in the pressing member 23.

In this embodiment, in order to secure the stability of the connection of the press member 23 to the valve body 1, the above-described four sets of fastening structures are provided.

In one embodiment of the present application, preferably, as shown in fig. 1 to 6, the present ball valve further includes a thrust valve seat 2, a disc spring 5, a transition sleeve 6, a spiral retainer 7, a side pipe 8, an anti-extrusion ring 9, a packing, a stem cylinder 11, a thrust bearing 12, an anti-flying sleeve 13, a handle 14, a handle cylinder 15, a fixing sleeve 16, a bracket 17, an inner hexagonal screw 18, and a positioning pin 19;

the lower part cover of valve rod 24 is equipped with footstep bearing 12, and the lower part cover that is located footstep bearing 12 of valve rod 24 is equipped with prevents flying cover 13, prevents flying to be connected through valve rod cylindric lock 11 between cover 13 and the valve rod 24, and the right side of spheroid 3 is provided with thrust bearing frame 4, and thrust bearing frame 4's right side is provided with transition cover 6, and the right side of transition cover 6 is provided with spiral retaining ring 7, and the right side and the left side of valve body 1 all are provided with side pipe 8.

The handle 14 is connected with the end part of the valve rod 24 through a handle cylindrical pin 15; the fixing sleeve 16 is sleeved outside the valve rod 24 and is arranged in a mounting through hole formed at the upper end of the bracket 17.

The support 17 is fixed on the valve body 1 through a hexagon socket head cap screw 18, and the mounting plane for mounting the support 17 on the valve body 1 is a plane, that is, the mounting plane is processed on the outer wall of the valve body 1 facing upward, and in addition, the support 17 and the valve body 1 are positioned through a positioning pin 19.

This ball valve stable in structure is provided with many places and moves seal structure, is difficult for revealing, and 24 movements of valve rod are nimble moreover, are difficult for appearing the jamming scheduling problem.

In one embodiment of the present application, preferably, the ball valve is provided with a high temperature wear test device, the high temperature wear test device comprises a box body, a heating member, a gas source and a force application member; wherein the force application member is detachably connected with the valve rod 24; the interior of the box body is used for placing a part of structure of the ball valve;

the box body is provided with a through hole for penetrating the force application component, and a dynamic sealing component is arranged between the force application component and the side wall of the through hole; the heating component is arranged inside the box body, the air source is arranged outside the box body, and the air source is communicated with the inside of the box body through a pipeline (not shown in the figure).

In this embodiment, through high temperature wear test device, the service conditions of this ball valve under harsh operating condition is simulated, guarantees the sealing performance and the switch flexibility of valve under high temperature, high pressure operating mode.

Specifically, the high-temperature wear-resistant test process of the ball valve by using the high-temperature wear-resistant test device is as follows:

at first can demolish support 17 and handle 14, again with foretell application of force component connection on valve rod 24, then open the overhead door of box, place this ball valve in the box, close the overhead door of box again, and pass the application of force component and expose in the box with the dynamic seal component, open air supply and heating element, build the operating mode of high temperature, gaseous medium, then utilize drive arrangement to connect the application of force component, it is rotatory to drive the application of force component according to certain frequency, and then drive valve rod 24 rotatory, and then open or close this ball valve according to predetermined frequency, in order to simulate the in service behavior of this ball valve under the operating mode of high temperature.

Note that: in order to ensure the gas in the box body to flow, the same side of the box body as the outlet side of the valve body 1 is connected with a gas outlet pipeline, and in order to accelerate the gas flow, an air exhaust device can be arranged at one end of the gas outlet pipeline.

Preferably, the force application member is a rotating shaft, and one end of the rotating shaft is connected with the valve rod 24 through a coupling, or one end of the rotating shaft is connected with the valve rod 24 in a threaded manner.

The driving device may preferably be a motor, the motor is fixed on the working plane through a support frame, the motor and the rotating shaft may be connected through a belt wheel transmission mechanism, or connected through a gear transmission mechanism, or connected through a coupling, and further drives the force application member to drive the valve rod 24 to rotate.

In conclusion, through structural optimization in various aspects, the ball valve can reach 4500LB pressure level, can resist 650 ℃ high temperature, and solves the problems of high-temperature and high-pressure working conditions of special media such as steam, gas, coal slag, ore pulp, heavy oil and the like and the application of coal powder wear-resisting media.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A ball valve, comprising: a valve seat and a ball; wherein the ball abuts against the valve seat;

the valve seat and the ball are both formed of cemented carbide.

2. The ball valve of claim 1, wherein the sealing surfaces of the valve seat and the ball that contact each other are rough sealing surfaces formed by directional grinding.

3. The ball valve of claim 1, wherein the cemented carbide is a tungsten-cobalt based cemented carbide.

4. The ball valve of claim 3, wherein the cemented carbide is formed by powder metallurgy sintering.

5. The ball valve according to claim 1, further comprising a valve body formed with an installation space penetrating both side portions thereof in a length direction thereof, the valve seat being disposed in the installation space;

the valve body is formed of heat resistant steel.

6. The ball valve of claim 5, wherein the valve body is formed of ASTMA182F92 heat resistant steel;

the wall thickness of the valve body is 39.5 mm.

7. The ball valve according to claim 5, further comprising a valve stem, a pressing member, a fastening bolt, a fastening nut, an elastic member, and a dynamic sealing member assembly; one end of the valve rod penetrates through the valve body and is connected with the ball body;

8. The ball valve of claim 7, wherein the resilient member is a disc spring.

9. The ball valve according to claim 7, wherein the number of the fastening bolts, the fastening nuts, and the elastic members is four and corresponds to one another;

the four fastening bolts are uniformly distributed on the pressing component.

10. The ball valve according to claim 7, characterized in that the ball valve is provided with a high temperature wear test device comprising a box, a heating member, a gas source and a force application member; wherein the force application member is detachably connected with the valve rod; the interior of the box body is used for placing a part of structure of the ball valve;