Valve stem sealing structure and eccentric half-ball valve

Abstract

The application discloses a valve rod sealing structure and an eccentric half-ball valve in the technical field of valve equipment, which comprises a valve body, valve body joints are arranged at both ends of the valve body, a half-ball valve clack is arranged in the valve body, upper valve rods and lower valve rods are fixedly arranged at the upper end and the lower end of the half-ball valve clack respectively, upper columns and lower columns corresponding to the upper valve rods and the lower valve rods are fixedly arranged on the upper side and the lower side of the valve body respectively, a sealing mechanism is arranged between the upper column and the upper valve rod, a plurality of lower valve rod sealing rings are arranged between the side edge of the lower valve rod and the lower column, the lower valve rod is provided with grooves matched with the plurality of lower valve rod sealing rings, a valve seat mechanism corresponding to the half-ball valve clack is arranged at one end of the valve body, connecting pipes are arranged at both ends of the valve body correspondingly, and an intermediate block is arranged between one valve body joint and the connecting pipe. The application can provide sufficient maintenance space, facilitates cleaning and replacement of internal parts, and has high maintenance efficiency. Meanwhile, the sealing rings of the valve rod side wall are convenient to replace, and the sealing effect is satisfied.

Description

Technical Field

[0001] This invention relates to the field of valve equipment technology, and in particular to a valve stem sealing structure and an eccentric hemispherical valve. Background Technology

[0002] Eccentric ball valves are widely used in working environments requiring strict shut-off, such as petroleum, chemical, and urban water supply and drainage. They provide reliable control valves and are a relatively new type of ball valve. They have some unique advantages due to their structure, such as good sealing, low opening and closing torque, and the ability to regulate and strictly shut off the medium, making them convenient for users to operate.

[0003] Existing eccentric ball valves still have some problems during use. Often, after a period of use, the internal valve seat or side wall will rust and wear. The valve body of the existing ball valve is tightly fitted to the pipelines at both ends, and it is still difficult to separate it effectively after disassembly. As a result, it is not possible to easily clean and replace the internal parts, which affects normal use and service life.

[0004] To address these issues, we propose a valve stem sealing structure and an eccentric hemispherical valve. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a valve stem sealing structure and an eccentric hemispherical valve.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A valve stem sealing structure and an eccentric hemispherical valve are disclosed, comprising a valve body with valve body connectors at both ends, a hemispherical valve disc inside the valve body, an upper valve stem and a lower valve stem fixedly mounted at the upper and lower ends of the hemispherical valve disc, respectively, an upper column and a lower column corresponding to the upper and lower valve stems fixedly mounted on the upper and lower sides of the valve body, a sealing mechanism between the upper column and the upper valve stem, a plurality of lower valve stem sealing rings between the side of the lower valve stem and the lower column, and the lower valve stem having grooves matching the plurality of lower valve stem sealing rings, a valve seat mechanism corresponding to the hemispherical valve disc being provided at one end of the valve body, connecting pipes being provided at both ends of the valve body, and an intermediate block being matched between one of the valve body connectors and the connecting pipe.

[0008] Preferably, the sealing mechanism includes a valve stem sealing block, the upper column is provided with a recessed groove that matches the valve stem sealing block, and the valve stem sealing block is embedded in the recessed groove. The valve stem sealing block is sleeved on the upper valve stem. The valve stem sealing block and the side of the upper valve stem are provided with a plurality of upper valve stem sealing rings, and the upper valve stem is provided with grooves that match the plurality of upper valve stem sealing rings. A sealing block sealing ring is provided between the bottom end of the valve stem sealing block and the upper column, and the upper column is provided with a groove that matches the sealing block sealing ring.

[0009] Preferably, the upper column and the lower column are respectively provided with through holes corresponding to the upper valve stem and the lower valve stem, the upper column is provided with an upper column connector at the upper end, and the upper valve stem extends out of the port of the upper column, and the lower end of the lower column is closed.

[0010] Preferably, the valve seat mechanism includes an annular valve seat, the valve body connector has an annular groove that matches the annular valve seat, and a valve seat sealing ring is provided between the annular valve seat and the annular groove. One end of the annular valve seat matches the end face of the hemispherical valve disc, a flange ring is provided between the intermediate block and the annular valve seat, and an annular groove is provided at the end of the annular valve seat corresponding to the flange ring, and a first flange sealing ring is provided in the annular groove.

[0011] Preferably, a flange ring is also provided between the connecting pipe and the valve body joint, and a flange ring is also provided between the connecting pipe and the intermediate block.

[0012] Preferably, the intermediate block has second flange sealing rings corresponding to the flange rings on both sides, and grooves corresponding to the two second flange sealing rings on both sides. Several protrusions are evenly fixed around the grooves. A positioning groove corresponding to the protrusions is provided on one side of the second flange sealing ring. The radius of the intermediate block is smaller than that of the valve body joint and the connecting pipe. The valve body joint and the connecting pipe are fixedly connected by several bolts. One side of the intermediate block is rotatably connected to the valve body through a rotating shaft. A positioning block is fixedly provided on one side of the intermediate block. A positioning rod is fixedly provided on the horizontal line of the valve body sidewall. The positioning block has a slot corresponding to the positioning rod, and the slot is arc-shaped. A handle is fixedly provided on the sidewall of the positioning block.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] This invention establishes a gap between the valve body and the connecting pipe, and rotatably positions an intermediate block within this gap. The valve body and the connecting pipe are fixed with several bolts, which also tightly clamp the intermediate block in the middle. Second flange sealing rings are provided on both sides of the intermediate block to effectively ensure sealing. During maintenance, the intermediate block can be rotated out of the gap, providing sufficient maintenance space for convenient cleaning and replacement of internal parts, thus improving work efficiency. Furthermore, a valve stem sealing block and corresponding upper valve stem sealing ring and sealing block sealing ring are provided on the upper valve stem side of the hemispherical valve disc, and a corresponding lower valve stem sealing ring is provided on the lower valve stem side of the hemispherical valve disc. Both the upper valve stem sealing ring and the sealing block sealing ring are easily replaceable, effectively satisfying the valve stem sealing requirement. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a valve stem sealing structure and an eccentric hemispherical valve proposed in this invention.

[0016] Figure 2 This is a bottom view schematic diagram of a valve stem sealing structure and an eccentric hemispherical valve proposed in this invention.

[0017] Figure 3 This is a schematic diagram of the valve stem sealing structure and the cross-sectional structure of the valve body in the eccentric hemispherical valve proposed in this invention.

[0018] Figure 4 This is a schematic diagram of the cross-sectional structure of the valve stem sealing structure and the upper column and valve stem sealing block in the eccentric hemispherical valve proposed in this invention.

[0019] Figure 5 This is a schematic diagram of a valve stem sealing structure and the structure of an eccentric hemispherical valve after the intermediate block is rotated and adjusted according to the present invention.

[0020] Figure 6 This is a schematic diagram of a valve stem sealing structure and an annular valve seat in an eccentric hemispherical valve proposed in this invention.

[0021] Figure 7 This is a schematic diagram of a valve stem sealing structure and a second flange sealing ring in an eccentric hemispherical valve proposed in this invention.

[0022] In the diagram: 1. Valve body, 2. Valve body connector, 3. Hemispherical valve disc, 4. Upper valve stem, 5. Lower valve stem, 6. Upper column, 7. Lower column, 8. Lower valve stem sealing ring, 9. Connecting pipe, 10. Intermediate block, 11. Valve stem sealing block, 12. Upper valve stem sealing ring, 13. Sealing block sealing ring, 14. Upper column connector, 15. Annular valve seat, 16. Valve seat sealing ring, 17. Flange ring, 18. First flange sealing ring, 19. Second flange sealing ring, 20. Protrusion, 21. Positioning groove, 22. Positioning block, 23. Positioning rod, 24. Handle. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0024] Reference Figure 1-7Because existing eccentric hemispherical valves develop rust and wear on their internal valve seats or sidewalls after a period of use, and because the valve body is tightly fitted to the pipes at both ends, it is difficult to effectively separate after disassembly, making it impossible to easily clean and replace internal parts, thus affecting normal use and service life. This solution proposes a valve stem sealing structure and an eccentric hemispherical valve, including a valve body 1, valve body connectors 2 at both ends of the valve body 1 for docking, and a hemispherical valve disc 3 inside the valve body 1, with the upper and lower ends of the hemispherical valve disc 3 respectively fixed. The valve body 1 has an upper valve stem 4 and a lower valve stem 5, which are detachably fixed to the hemispherical valve disc 3. The upper and lower sides of the valve body 1 are respectively fixed with an upper column 6 and a lower column 7 corresponding to the upper valve stem 4 and lower valve stem 5. A sealing mechanism is provided between the upper column 6 and the upper valve stem 4. The sealing mechanism includes a valve stem sealing block 11. The upper column 6 has a groove that matches the valve stem sealing block 11, and the valve stem sealing block 11 is embedded in the groove. The valve stem sealing block 11 can be effectively fitted and positioned with the groove and can be pulled out. The valve stem sealing block 11 is sleeved on the upper valve stem 4. A plurality of upper valve stem sealing rings 12 are provided on the side of the upper valve stem 4, and the upper valve stem 4 has grooves that match the plurality of upper valve stem sealing rings 12. Lubricating oil is applied to the plurality of upper valve stem sealing rings 12 to effectively ensure the rotation of the upper valve stem 4 and to ensure the sealing effect. A sealing block sealing ring 13 is provided between the bottom end of the valve stem sealing block 11 and the upper column 6. The sealing block sealing ring 13 plays a sealing role, and the upper column 6 has a groove that matches the sealing block sealing ring 13. After the valve stem sealing block 11 is pulled out, the plurality of upper valve stem sealing rings 12 and the sealing block sealing ring 13 can be sealed. For easy replacement of valve stem 3, several lower valve stem sealing rings 8 are provided between the side of the lower valve stem 5 and the lower column 7, and the lower valve stem 5 is provided with grooves that match the several lower valve stem sealing rings 8. Lubricating oil is applied to the several lower valve stem sealing rings 8 to effectively ensure the rotation of the upper valve stem 4 and ensure the sealing effect. The upper column 6 and the lower column 7 are respectively provided with through holes corresponding to the upper valve stem 4 and the lower valve stem 5. The upper end of the upper column 6 is provided with an upper column connector 14, and the upper valve stem 4 extends out of the upper column 6. The upper end of the upper valve stem 4 is connected to the existing external control mechanism, and the lower end of the lower column 7 is closed.

[0025] One end of the valve body 1 is provided with a valve seat mechanism corresponding to the hemispherical valve disc 3. The valve seat mechanism includes an annular valve seat 15. The valve body connector 2 is provided with an annular groove that matches the annular valve seat 15. A valve seat sealing ring 16 is provided between the annular valve seat 15 and the annular groove. The annular valve seat 15 can be embedded in the annular groove for easy disassembly and installation, and ensures a sealing effect between it and the valve seat sealing ring 16. One end of the annular valve seat 15 matches the end face of the hemispherical valve disc 3. The hemispherical valve disc 3 and the annular valve seat 15 fit together to achieve an effective sealing effect. A flange ring 17 is provided between the intermediate block 10 and the annular valve seat 15. The flange ring 17 plays a sealing role. The end of the annular valve seat 15 corresponding to the flange ring 17 is provided with an annular groove. A first flange sealing ring 18 is provided in the annular groove. The first flange sealing ring 18 plays a sealing role.

[0026] Both ends of the valve body 1 are equipped with connecting pipes 9, which are the fluid flow pipes. The connecting pipes 9 can be fixedly connected to the valve body connector 2 by several bolts. Both the connecting pipes 9 and the valve body connector 2 have several corresponding round holes for matching the bolts. A circular intermediate block 10 is provided between one valve body connector 2 and the connecting pipe 9. A flange ring 17 is also provided between the connecting pipe 9 and the valve body connector 2, and between the connecting pipe 9 and the intermediate block 10. Second flange sealing rings 19, corresponding to the flange rings 17, are provided on both sides of the intermediate block 10. The second flange sealing rings 19 effectively seal the valve. Grooves corresponding to the two second flange sealing rings 19 are provided on both sides of the intermediate block 10, and several protrusions 20 are evenly fixed around the grooves. A positioning groove 21 corresponding to the protrusions 20 is provided on one side of each second flange sealing ring 19. The width of the protrusions 20 is less than the depth of the positioning groove 21, making... The second flange sealing ring 19 has a protruding middle block 10 on its side. Several protrusions 20 effectively limit the second flange sealing ring 19 and prevent it from falling off during operation. The radius of the middle block 10 is smaller than that of the valve body connector 2 and the connecting pipe 9. The valve body connector 2 and the connecting pipe 9 are fixedly connected by several bolts. Several bolts clamp the middle block 10 in the middle. One side of the middle block 10 is rotatably connected to the valve body 1 through a rotating shaft. During maintenance, the middle block 10 can be rotated to remove the gap, thereby providing sufficient maintenance space and enabling convenient cleaning and replacement of internal parts. A positioning block 22 is fixedly provided on one side of the middle block 10. A positioning rod 23 is fixedly provided on the horizontal line of the side wall of the valve body 1. The positioning block 22 has a slot corresponding to the positioning rod 23, and the slot is arc-shaped. The positioning rod 23 can correspond to the slot of the positioning block 22 to position the middle block 10. A handle 24 is fixedly provided on the side wall of the positioning block 22. The middle block 10 can be rotated by the handle 24.

[0027] The working principle of this device in this invention is as follows:

[0028] During maintenance, the intermediate block 10 between the valve body connector 2 and the connecting pipe 9 can be rotated out. Several bolts can be removed first, and then the intermediate block 10 can be rotated by the handle 24. The intermediate block 10 is rotated out and a gap is left, providing sufficient maintenance space. At this time, the annular valve seat 15 can be easily cleaned and replaced. Then, the annular valve seat 15 is embedded in the annular groove, and the intermediate block 10 is reset. The flange rings 17 on both sides are embedded on both sides of the intermediate block 10, and the second flange sealing rings 19 on both sides of the intermediate block 10 are effectively restricted by several protrusions 20. When the intermediate block 10 is rotated and reset, the second flange sealing rings 19 will not be squeezed off. When the intermediate block 10 is rotated to the point where the positioning rod 23 corresponds to the slot of the positioning block 22, several bolts can be fixed. At the same time, during maintenance, the valve stem sealing block 11 can be pulled out for easy replacement of several upper valve stem sealing rings 12 and sealing block sealing rings 13.

[0029] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A valve stem sealing structure and an eccentric hemispherical valve, comprising a valve body (1), wherein valve body connectors (2) are provided at both ends of the valve body (1), characterized in that, The valve body (1) is provided with a hemispherical valve disc (3) inside. The upper and lower ends of the hemispherical valve disc (3) are respectively fixed with an upper valve stem (4) and a lower valve stem (5). The upper and lower sides of the valve body (1) are respectively fixed with an upper column (6) and a lower column (7) corresponding to the upper valve stem (4) and the lower valve stem (5). A sealing mechanism is provided between the upper column (6) and the upper valve stem (4). A number of lower valve stem sealing rings (8) are provided between the side of the lower valve stem (5) and the lower column (7). The lower valve stem (5) is provided with a groove that matches the number of lower valve stem sealing rings (8). One end of the valve body (1) is provided with a groove that matches the hemispherical valve disc (3). The corresponding valve seat mechanism has connecting pipes (9) at both ends of the valve body (1), and an intermediate block (10) is matched between the valve body connector (2) and the connecting pipe (9); the valve seat mechanism includes an annular valve seat (15), and the valve body connector (2) has an annular groove that matches the annular valve seat (15), and a valve seat sealing ring (16) is provided between the annular valve seat (15) and the annular groove. One end of the annular valve seat (15) matches the end face of the hemispherical valve disc (3), and a flange ring (17) is matched between the intermediate block (10) and the annular valve seat (15). One end of the flange ring (17) is provided with an annular groove, and a first flange sealing ring (18) is matched in the annular groove. A flange ring (17) is also matched between the connecting pipe (9) and the valve body joint (2). A flange ring (17) is also matched between the connecting pipe (9) and the intermediate block (10). The intermediate block (10) is provided with second flange sealing rings (19) on both sides corresponding to the flange rings (17). The intermediate block (10) is provided with grooves on both sides corresponding to the two second flange sealing rings (19), and several protrusions (20) are evenly fixed around the grooves. The second flange sealing rings (19) The middle block (10) has a positioning groove (21) corresponding to several protrusions (20) on one side. The radius of the middle block (10) is smaller than that of the valve body connector (2) and the connecting pipe (9). The valve body connector (2) and the connecting pipe (9) are fixedly connected by several bolts. The middle block (10) is rotatably connected to the valve body (1) through a rotating shaft on one side. A positioning block (22) is fixedly provided on one side of the middle block (10). A positioning rod (23) is fixedly provided on the horizontal line of the side wall of the valve body (1). The positioning block (22) has a slot corresponding to the positioning rod (23), and the slot is arc-shaped. A handle (24) is fixedly provided on the side wall of the positioning block (22).

2. The valve stem sealing structure and eccentric hemispherical valve according to claim 1, characterized in that, The sealing mechanism includes a valve stem sealing block (11), the upper column (6) is provided with a groove matching the valve stem sealing block (11), and the valve stem sealing block (11) is embedded in the groove. The valve stem sealing block (11) is sleeved on the upper valve stem (4). The valve stem sealing block (11) and the upper valve stem (4) are provided with a plurality of upper valve stem sealing rings (12) on their sides, and the upper valve stem (4) is provided with grooves matching the plurality of upper valve stem sealing rings (12). A sealing block sealing ring (13) is provided between the bottom end of the valve stem sealing block (11) and the upper column (6), and the upper column (6) is provided with a groove matching the sealing block sealing ring (13).

3. The valve stem sealing structure and eccentric hemispherical valve according to claim 1, characterized in that, The upper column (6) and the lower column (7) are respectively provided with through holes corresponding to the upper valve stem (4) and the lower valve stem (5). The upper end of the upper column (6) is provided with an upper column connector (14), and the upper valve stem (4) extends out of the port of the upper column (6). The lower end of the lower column (7) is closed.

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