Full-bore fixed hard-sealed wear-resistant ball valve

Abstract

The present invention belongs to the technical field of ball valves, and discloses a full-bore fixed hard-sealed wear-resistant ball valve, including: a valve body, a valve cover, and a valve seat. The valve seat is installed inside the valve cover, and further includes a wear-resistant structure. The wear-resistant structure includes a valve stem grease injection assembly and a valve seat feeding assembly; the valve stem grease injection assembly is located on the valve body and can actively supply grease to the valve stem and discharge waste grease; the valve seat feeding assembly is located between the valve seat and the valve cover and can drive the valve seat to closely adhere to the surface of the ball. In the present invention, by providing a valve stem grease injection assembly on the valve body, grease can be actively supplied to the valve stem and waste grease can be discharged, improving the lubricity of the valve stem, thereby enhancing the wear-resistant effect of the valve stem and effectively increasing the service life of the ball valve. In addition, by providing a valve seat feeding assembly between the valve seat and the valve cover, the valve seat can be driven by the valve seat feeding assembly to closely adhere to the surface of the ball, enabling continuous fitting when the ball and the valve seat are worn, further increasing the service life of the ball valve.

Description

Technical Field

[0001] The invention belongs to the technical field of ball valves, and particularly relates to a full-bore fixed hard-sealed wear-resistant ball valve. Background Art

[0002] The structure of a fixed ball valve adopts two valve cores, the upper one is a valve stem and the lower one is a fixed shaft. The operating torque is small. When working, the acting force generated by the fluid pressure in front of the valve on the sphere is all transmitted to the bearing, and the sphere will not move towards the valve seat, so the valve seat will not bear excessive pressure, and it is applicable to high-pressure and large-diameter valves. The closing member of a fixed ball valve is a sphere, and the sphere rotates around the center line of the valve body to achieve opening and closing. A ball valve is mainly used for cutting, distributing and changing the flow direction of the medium in a pipeline.

[0003] Since the valve seat sealing surface of the existing hard-sealed ball valve is generally a bevel straight seal, during the opening and closing process of the valve, the relative displacement between the sphere and the valve seat causes a large amount of solid particles in the fluid medium to be brought into the space between the sphere sealing surface and the valve seat sealing surface through the valve seat bevel. These solid particles will increase the friction between the sphere sealing surface and the valve seat sealing surface, damage the sphere sealing surface and the valve seat sealing surface, and after being used for a period of time, the valve will show internal leakage, and the leakage amount increases continuously with the number of opening and closing operations, ultimately resulting in the failure of the valve seal.

[0004] In response to the above problems, such as the bidirectional hard-sealed fixed ball valve for coal chemical industry proposed in the patent number 201120288962.3, which adopts a wide arc surface bidirectional hard-sealed structure, generally improves the service life by 1 to 3 times compared with the original imported valves, and can still effectively seal under the condition of slight wear of the sphere sealing surface and the valve seat sealing surface. Although it can solve the wear problem between the sphere sealing surface and the valve seat sealing surface, it does not effectively solve the wear of the valve stem, making the valve stem prone to wear, thus reducing the service life of the ball valve. Summary of the Invention

[0005] The purpose of the present invention is to provide a full-bore fixed hard-sealed wear-resistant ball valve to solve the problems in the prior art mentioned in the above background art.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] The full-bore fixed hard-sealed wear-resistant ball valve includes:

[0008] A valve body, inside which a rotatable sphere is installed through a valve stem;

[0009] A valve cover, which is connected to both ends of the valve body through a flange;

[0010] A valve seat, which is installed inside the valve cover and is in sealed contact with the sphere;

[0011] It further includes an abrasion-resistant structure, and the abrasion-resistant structure includes a valve stem greasing assembly and a valve seat feeding assembly;

[0012] The valve stem greasing assembly is located on the valve body and can actively supply grease to the valve stem and discharge waste grease;

[0013] The valve seat feeding assembly is located between the valve seat and the valve cover and can drive the valve seat to closely adhere to the surface of the sphere.

[0014] Preferably, the valve stem includes an upper valve stem and a lower valve stem, and the sphere is connected between the upper valve stem and the lower valve stem.

[0015] Preferably, upper mounting holes and lower mounting holes are respectively formed at the top and bottom of the valve body, and the upper valve stem and the lower valve stem are respectively rotatably connected in the upper mounting hole and the lower mounting hole through bearings.

[0016] Preferably, the valve stem greasing assembly includes: a greasing channel, a greaser and a waste grease discharger that are communicated with the greasing channel;

[0017] The greasing channel is arranged inside the valve body and is communicated with the upper mounting hole and the lower mounting hole. The greasing channel includes a main channel and upper auxiliary channels and lower auxiliary channels located at both ends of the main channel;

[0018] The greaser is communicated with the upper end of the greasing channel, and the waste grease discharger is connected to the lower end of the greasing channel.

[0019] Preferably, the greaser includes:

[0020] A grease storage pipe, a grease outlet pipe connected to the lower end of the grease storage pipe, and a grease pushing plate located inside the grease storage pipe; wherein, the grease outlet pipe is threadedly connected to the inside of the upper auxiliary channel, a push rod is fixed to the top of the grease pushing plate, and a first compression spring is sleeved outside the push rod.

[0021] Preferably, the waste grease discharger includes:

[0022] A grease discharge pipe and a timing solenoid valve assembled on the grease discharge pipe. The upper end of the grease discharge pipe is threadedly connected to the lower auxiliary channel; a housing is connected to the outside of the grease discharge pipe, and a storage battery is installed inside the housing, and the storage battery is electrically connected to the timing solenoid valve.

[0023] Preferably, a valve seat groove is provided on the inner side of the valve cover. The valve seat is located inside the valve seat groove, and a sealing ring is provided on the outside of the valve seat for sealing the gap between the valve seat groove and the valve seat;

[0024] The valve seat feeding assembly is arranged between the valve seat groove and the valve seat.

[0025] Preferably, the valve seat feeding assembly includes:

[0026] A spring column and a second compression spring connected to the outside of the spring column; wherein, one end of the spring column is installed on one side of the valve seat, and the other end of the spring column is inserted into a column hole, and the column hole is opened on the inner side wall of the valve seat groove.

[0027] Preferably, the spring column includes:

[0028] A column body and a threaded connection head fixed to the end of the column body, and a threaded connection hole matching the threaded connection head is opened on one side of the valve seat, and the threaded connection head is threadedly connected in the threaded connection hole.

[0029] The technical effects and advantages of the present invention: The full-bore fixed hard-sealed wear-resistant ball valve proposed by the present invention has the following advantages compared with the prior art:

[0030] In the present invention, by arranging a valve stem grease injection assembly on the valve body, grease can be actively provided to the valve stem and waste grease can be discharged, improving the lubricity of the valve stem, thereby improving the wear resistance effect of the valve stem, and effectively improving the service life of the ball valve. In addition, a valve seat feeding assembly is arranged between the valve seat and the valve cover. Driven by the valve seat feeding assembly, the valve seat can be closely attached to the surface of the ball. When the ball and the valve seat are worn, they can continue to fit, further improving the service life of the ball valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic structural diagram of the present invention;

[0032] Figure 2 is an exploded structural diagram of the ball, valve cover, and valve cover of the present invention;

[0033] Figure 3 is a schematic structural diagram of the valve stem of the present invention;

[0034] Figure 4 is a schematic structural diagram of the grease injection channel of the present invention;

[0035] Figure 5 is a schematic structural diagram of the grease injector of the present invention;

[0036] Figure 6 is a schematic structural diagram of the waste grease discharger of the present invention;

[0037] Figure 7 is a schematic structural diagram of the valve seat feeding assembly of the present invention;

[0038] Figure 8 is a schematic structural diagram of the spring column of the present invention.

[0039] In the figure:

[0040] 1. Valve body; 101. Upper mounting hole; 102. Lower mounting hole;

[0041] 2. Sphere;

[0042] 3. Valve cover; 301. Valve seat groove;

[0043] 4. Valve seat; 401. Sealing ring;

[0044] 5. Valve stem grease injection assembly; 501. Grease injection channel; 502. Grease injector; 503. Waste grease discharger; 504. Main channel; 505. Upper auxiliary channel; 506. Lower auxiliary channel; 507. Grease storage pipe; 508. Grease outlet pipe; 509. Grease pushing plate; 510. Push rod; 511. Compression spring I; 512. Grease discharge pipe; 513. Timing solenoid valve; 514. Housing;

[0045] 6. Valve seat feeding assembly; 601. Spring post; 602. Compression spring II; 603. Post hole; 604. Post body; 605. Threaded connector; 606. Threaded connection hole;

[0046] 7. Valve stem; 701. Upper valve stem; 702. Lower valve stem. Specific embodiments

[0047] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0048] In the embodiments of the present invention, a full-bore fixed hard-sealed wear-resistant ball valve is provided. Exemplarily, as Figures 1-3 shown, it includes: a valve body 1, a valve cover 3, a valve seat 4, a valve stem 7, and basic fittings of the ball valve (not shown in the figure). A rotatable sphere 2 is installed inside the valve body 1 through the valve stem 7; the valve cover 3 is connected to both ends of the valve body 1 through a flange; the valve seat 4 is installed inside the valve cover 3 and is in sealed contact with the sphere 2. The basic fittings of the ball valve are used to connect the valve body 1, the valve cover 3, the valve seat 4, and the valve stem 7 together. Their specific structures and installation methods have been widely disclosed in the prior art and will not be elaborated here. In addition, the valve stem 7 includes an upper valve stem 701 and a lower valve stem 702, and the sphere 2 is connected between the upper valve stem 701 and the lower valve stem 702.

[0049] In this embodiment, it is mainly to improve the wear resistance of the ball valve and extend its service life. Therefore, in this embodiment, a wear-resistant structure composed of a valve stem grease injection assembly 5 and a seat feeding assembly 6 is provided on the valve body 1. Among them, the valve stem grease injection assembly 5 can actively supply grease to the valve stem 7 and discharge the used grease, improving the lubricity of the valve stem 7, thereby enhancing the wear resistance effect of the valve stem 7 and effectively extending the service life of the ball valve. Driven by the seat feeding assembly 6, the seat 4 can closely adhere to the surface of the sphere 2, enabling continuous fitting when the sphere 2 and the seat 4 are worn, further extending the service life of the ball valve.

[0050] The following will combine with the attached Figures 4-8 to further illustrate the valve stem grease injection assembly 5 and the seat feeding assembly 6.

[0051] For the convenience of grease injection and discharge, upper mounting holes 101 and lower mounting holes 102 are respectively opened at the top and bottom of the valve body 1. The upper valve stem 701 and the lower valve stem 702 are respectively rotatably connected to the upper mounting hole 101 and the lower mounting hole 102 through bearings. Grease is injected from the upper mounting hole 101, and the waste grease is discharged from the lower mounting hole 102, enabling the replacement of the grease around the upper valve stem 701 and the lower valve stem 702. This allows the valve stem grease injection assembly 5 to actively supply grease to the valve stem 7 and discharge the used grease.

[0052] Specifically, the valve stem grease injection assembly 5 includes: a grease injection channel 501, a grease injector 502 and a waste grease discharger 503 that are connected to the grease injection channel 501. The grease injection channel 501 is arranged inside the valve body 1 and is connected to the upper mounting hole 101 and the lower mounting hole 102. The grease injection channel 501 includes a main channel 504 and upper auxiliary channels 505 and lower auxiliary channels 506 located at both ends of the main channel 504. The grease injector 502 is connected to the upper end of the grease injection channel 501, and the waste grease discharger 503 is connected to the lower end of the grease injection channel 501.

[0053] The upper mounting hole 101 and the lower mounting hole 102 are connected together through the main channel 504, the upper auxiliary channel 505, and the lower auxiliary channel 506, enabling the grease in the grease injector 502 to flow into the main channel 504 through the upper auxiliary channel 505 and then be discharged through the lower auxiliary channel 506, allowing the grease to enter the upper mounting hole 101 and the lower mounting hole 102, supply grease to the upper valve stem 701 and the lower valve stem 702, and discharge the waste grease, improving the lubrication of the upper valve stem 701 and the lower valve stem 702.

[0054] The grease injector 502 includes: a grease storage tube 507, a grease outlet tube 508 connected to the lower end of the grease storage tube 507, and a grease pushing plate 509 located inside the grease storage tube 507. Among them, the grease outlet tube 508 is threadedly connected inside the upper auxiliary channel 505, a push rod 510 is fixed to the top of the grease pushing plate 509, and a first compression spring 511 is sleeved outside the push rod 510.

[0055] The above-mentioned grease storage tube 507 is used to store grease. The grease pushing plate 509 is forced by the first compression spring 511 to squeeze the grease downward, so that the grease can be discharged from the grease outlet tube 508 into the upper auxiliary channel 505. In addition, the grease outlet tube 508 is fixed to the end cover, and the end cover is threadedly connected to the lower end of the grease storage tube 507, which is convenient for disassembly to add grease.

[0056] The waste grease discharger 503 includes: a grease discharge tube 512 and a timing solenoid valve 513 installed on the grease discharge tube 512. The upper end of the grease discharge tube 512 is threadedly connected to the lower auxiliary channel 506. A housing 514 is connected to the outside of the grease discharge tube 512, and a storage battery is installed inside the housing 514. The storage battery is electrically connected to the timing solenoid valve 513. Through the setting of the timing solenoid valve 513, the grease discharge tube 512 can be opened regularly, so that new grease enters the grease injection channel 501 to add new grease, and at the same time, waste grease can be discharged.

[0057] The above valve seat feeding assembly 6 is located between the valve seat 4 and the valve cover 3 and can drive the valve seat 4 to closely adhere to the surface of the sphere 2. In this embodiment, a valve seat groove 301 is provided on the inner side of the valve cover 3. The valve seat 4 is located inside the valve seat groove 301, and a sealing ring 401 is provided outside the valve seat 4 to seal the gap between the valve seat groove 301 and the valve seat 4.

[0058] Specifically, the valve seat feeding assembly 6 includes: a spring column 601 and a second compression spring 602 connected to the outside of the spring column 601. One end of the spring column 601 is installed on one side of the valve seat 4, and the other end of the spring column 601 is inserted into a column hole 603, and the column hole 603 is opened on the inner side wall of the valve seat groove 301.

[0059] Through the setting of the spring column 601, the position of the second compression spring 602 can be restricted to prevent it from shifting. The column hole 603 provides a moving space for the spring column 601 and is conducive to the positioning between the valve seat 4 and the valve cover 3. Under normal conditions, the valve seat 4 can closely adhere to the surface of the sphere 2 under the action of the second compression spring 602. In addition, multiple groups of spring columns 601 and second compression springs 602 are provided and are distributed at equal angles to keep the flatness of the valve seat 4 and prevent it from tilting.

[0060] In addition, for the convenience of installing the spring column 601, the spring column 601 includes: a column body 604 and a threaded connector 605 fixed to the end of the column body 604. A threaded connection hole 606 matching the threaded connector 605 is formed on one side of the valve seat 4. When installing the spring column 601, the threaded connector 605 is threadedly connected to the threaded connection hole 606, thereby fixing the column body 604 and facilitating the disassembly, assembly and maintenance of the column body 604.

[0061] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. Full-bore fixed hard-sealed wear-resistant ball valve, characterized in that, Comprising: A valve body (1), inside which a rotatable sphere (2) is installed through a valve stem (7); upper mounting holes (101) and lower mounting holes (102) are respectively formed at the top and bottom of the valve body (1); A valve cover (3), which is connected to both ends of the valve body (1) through a flange; A valve seat (4), which is installed inside the valve cover (3) and is in sealing contact with the sphere (2); It further includes an anti-wear structure, which includes a valve stem greasing assembly (5) and a valve seat feeding assembly (6); The valve stem greasing assembly (5) is located on the valve body (1) and can actively supply grease to the valve stem (7) and discharge waste grease; The valve seat feeding assembly (6) is located between the valve seat (4) and the valve cover (3) and can drive the valve seat (4) to closely adhere to the surface of the sphere (2); The valve stem greasing assembly (5) includes: a greasing channel (501) and a grease injector (502) and a waste grease discharger (503) connected to the greasing channel (501); The greasing channel (501) is arranged inside the valve body (1) and is connected to the upper mounting hole (101) and the lower mounting hole (102). The greasing channel (501) includes a main channel (504) and upper auxiliary channels (505) and lower auxiliary channels (506) located at both ends of the main channel (504); The grease injector (502) is communicated with the upper end of the greasing channel (501), and the waste grease discharger (503) is connected to the lower end of the greasing channel (501); The grease injector (502) includes: A grease storage tube (507), a grease outlet tube (508) connected to the lower end of the grease storage tube (507), and a grease pushing plate (509) located inside the grease storage tube (507); wherein, the grease outlet tube (508) is threadedly connected to the inside of the upper auxiliary channel (505), a push rod (510) is fixed to the top of the grease pushing plate (509), and a compression spring I (511) is sleeved outside the push rod (510); The waste grease discharger (503) includes: A grease discharge tube (512) and a timing solenoid valve (513) installed on the grease discharge tube (512). The upper end of the grease discharge tube (512) is threadedly connected to the lower auxiliary channel (506); a housing (514) is connected to the outside of the grease discharge tube (512), and a storage battery is installed inside the housing (514), and the storage battery is electrically connected to the timing solenoid valve (513).

2. The full-bore fixed hard-sealed wear-resistant ball valve according to claim 1, characterized in that: The valve stem (7) includes an upper valve stem (701) and a lower valve stem (702), and the sphere (2) is connected between the upper valve stem (701) and the lower valve stem (702).

3. The full-bore fixed hard-sealed wear-resistant ball valve according to claim 2, wherein: The upper valve stem (701) and the lower valve stem (702) are respectively rotatably connected to the upper mounting hole (101) and the lower mounting hole (102) through bearings.

4. The full-bore fixed hard-sealed wear-resistant ball valve according to claim 3, wherein: A valve seat groove (301) is provided on the inner side of the valve cover (3). The valve seat (4) is located inside the valve seat groove (301), and a sealing ring (401) is provided outside the valve seat (4) for sealing the gap between the valve seat groove (301) and the valve seat (4); The valve seat feeding assembly (6) is arranged between the valve seat groove (301) and the valve seat (4).

5. The full-bore fixed hard-sealed wear-resistant ball valve according to claim 4, characterized in that: The valve seat feeding assembly (6) includes: A spring column (601) and a second compression spring (602) connected to the outside of the spring column (601); wherein, one end of the spring column (601) is installed on one side of the valve seat (4), and the other end of the spring column (601) is inserted into a column hole (603) opened on the inner side wall of the valve seat groove (301).

6. The full-bore fixed hard-sealed wear-resistant ball valve according to claim 5, characterized in that: The spring column (601) includes: A column body (604) and a threaded connection head (605) fixed to the end of the column body (604). A threaded connection hole (606) matching the threaded connection head (605) is opened on one side of the valve seat (4), and the threaded connection head (605) is threadedly connected in the threaded connection hole (606).

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