Hard sealing eccentric half ball valve

Abstract

The utility model discloses a hard sealing eccentric semi-ball valve, which comprises a valve body, an upper valve rod, a lower valve rod, a semi-ball valve core and a valve seat, the upper valve rod and the lower valve rod are respectively arranged at the upper end and the lower end of the valve body, the inner end of the upper valve rod is in linkage connection with the semi-ball valve core, and the inner end of the lower valve rod is in rotating connection with the semi-ball valve core; the valve further comprises a locking assembly used for locking the valve seat in the valve body, the locking assembly comprises a pressing ring, a plurality of sliding blocks are arranged on the periphery of the pressing ring, a mounting groove extending inwards is formed in one end of the valve body, a mounting part is arranged on the valve seat, the mounting part is arranged in the mounting groove, and a plurality of locking sliding ways with the number equal to that of the sliding blocks are arranged on the inner side of the mounting groove in the circumferential direction. The end of the valve body is further provided with an inlet and outlet used for allowing the corresponding sliding block to slide into the locking slide way, and when the sliding block slides into the locking slide way, the mounting part of the valve seat is pressed at the inner end of the mounting groove. According to the utility model, the stability of the valve seat mounting structure is obviously improved, the condition of medium leakage caused by looseness of the valve seat can be avoided, and the use is safer and more reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a hard-sealed eccentric hemispherical valve. Background Art

[0002] The eccentric hemispherical valve mainly realizes the opening and closing of the valve by the cooperation between the valve seat and the ball crown when the eccentric crankshaft rotates 90°. The sealing pair adopts a spherical design. When the hemispherical surface of the ball crown fits tightly with the valve seat, the valve is closed; when the valve is closed to open, the crankshaft is turned, and when the crankshaft rotates 90°, the valve is fully opened.

[0003] The utility model patent with the patent publication (announcement) number CN210218852U discloses a hard-sealed eccentric hemispherical valve, the metal valve seat of which is installed by threading the second fixing block to the inner wall of the valve body, and the second fixing block presses the metal valve seat against the first positioning end of the valve body, thereby achieving the installation of the metal valve seat. This structure realizes the detachable structure of the metal valve seat, and the metal valve seat can be replaced when it ages in the later stage. However, this structure has the following defects: the way the second fixing block cooperates with the valve body thread is easy to loosen during the frequent use of the valve, thereby causing axial displacement, and the axial displacement of the second fixing block will cause the metal valve seat to loosen, which will lead to medium leakage, and there will be safety hazards in the later use. Utility Model Content

[0004] The utility model aims to provide a hard-sealed eccentric hemispherical valve, which significantly improves the stability of the valve seat installation structure, can avoid medium leakage due to loose valve seat, and is safer and more reliable to use.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a hard-sealed eccentric hemispherical valve, comprising a valve body, an upper valve stem, a lower valve stem, a hemispherical valve core and a valve seat, wherein the upper valve stem and the lower valve stem are respectively installed at the upper and lower ends of the valve body, the hemispherical valve core is arranged in the valve body, and the inner end of the upper valve stem is linked to the hemispherical valve core, the inner end of the lower valve stem is rotatably connected to the hemispherical valve core, the valve seat is installed in the valve body for forming a sealing fit with the hemispherical valve core when the valve is closed; and also includes a device for locking the valve seat in the valve body. A locking assembly, the locking assembly includes a pressure ring, a plurality of sliders are arranged on the outer circumference of the pressure ring, an inwardly extending mounting groove is arranged at one end of the valve body, a mounting portion is arranged on the valve seat, the mounting portion is arranged in the mounting groove, a plurality of locking slideways corresponding to the number of the sliders are arranged along the circumferential direction on the inner side of the mounting groove, and an inlet and outlet for the corresponding sliders to slide into the locking slideway are also opened at the end of the valve body, when the slider slides into the locking slideway, the mounting portion of the valve seat is pressed tightly at the inner end of the mounting groove.

[0006] By adopting the above technical solution, during installation, you only need to press the mounting part of the valve seat into the inner end of the mounting groove first, and then slide the slider of the pressure ring axially into the corresponding inlet and outlet. When the slider corresponds to the inner end of the inlet and outlet, rotate the pressure ring circumferentially to completely slide the slider on the pressure ring into the inner end of the corresponding locking slideway to complete the installation of the pressure ring. At this time, the pressure ring presses the mounting part of the valve seat against the end of the mounting groove to achieve the installation of the valve seat. The installation structure is simple and reliable. During use, the valve seat and the pressure ring will not produce axial movement, thereby ensuring the sealing reliability of the closed state, and the use is safer and more reliable.

[0007] The utility model is further configured such that the locking slide includes a contraction guide portion and a locking portion in sequence in a direction away from the corresponding inlet and outlet, the height of the contraction guide portion gradually decreases in a direction approaching the locking portion, and when the slider slides into the locking portion, the slider and the locking portion are interference fit.

[0008] By adopting the above technical solution, the process of the slider sliding into the locking slide is from loose to tight, which is not only convenient for installation, but also less likely to cause axial slippage when the slider cooperates with the locking part, thereby improving the stability of the pressure ring installation structure.

[0009] The utility model is further configured as follows: the locking assembly also includes locking screws whose number is equivalent to that of the slider, the slider is provided with a through hole, and the end of the valve body is provided with a screw hole connected with the locking part at a position corresponding to the locking part of the locking slide, when the slider slides into the locking part of the corresponding locking slide, the through hole is coaxial with the screw hole, the locking screw includes a screw head, a threaded section and an optical axis section in sequence along the axial direction, the threaded section is threadedly connected to the corresponding screw hole, the screw head is tightly abutted against the outer end of the valve body, and the optical axis section is inserted into the corresponding through hole.

[0010] By adopting the above technical solution, after the slider of the pressure ring slides to the locking part, the pressure ring is locked by the locking screw, which further limits its circumferential movement and effectively ensures the stability of its installation structure.

[0011] The utility model is further configured that a guide dome is provided at the inner end of the optical axis segment.

[0012] By adopting the above technical solution, the dome arranged at the inner end of the optical axis segment plays a guiding role for inserting the optical axis segment into the circular hole of the pressure ring, which is beneficial to the installation operation of the locking screw.

[0013] The utility model is further configured that the end of the valve body is provided with a recessed portion for allowing the screw head to be fully embedded.

[0014] By adopting the above technical solution, the screw head of the locking screw will not protrude from the end face of the valve body, which facilitates the subsequent connection between the valve body and the pipeline.

[0015] The utility model is further configured that a gasket is sandwiched between the pressure ring and the valve seat.

[0016] By adopting the above technical solution, the gasket plays a role in protecting the pressure ring and the valve seat end face, which can reduce the wear between the two and increase the service life of the valve.

[0017] The utility model is further configured that an annular groove is provided at the inner end of the mounting portion of the valve seat, and a sealing ring is embedded in the annular groove to form a sealing fit with the inner end of the mounting groove.

[0018] By adopting the above technical solution, the sealing between the valve seat and the inner wall of the valve body can be improved, thereby preventing the medium from leaking from the gap between the two when the valve is closed.

[0019] The utility model is further configured such that a first annular protrusion is provided at the inner end of the annular groove, a second annular protrusion is provided at the inner end of the mounting groove, and the extrusion force of the first annular protrusion on the sealing ring is directed toward the second annular protrusion.

[0020] By adopting the above technical solution, the sealing between the valve seat and the inner wall of the valve body can be further improved.

[0021] The utility model is further configured that a wear-resistant coating is provided at a portion where the valve seat contacts the hemispherical valve core.

[0022] By adopting the above technical solution, the service life of the valve seat can be effectively improved.

[0023] The utility model is further configured that a plurality of operating panels are arranged on the inner wall of the pressure ring along the circumferential direction.

[0024] By adopting the above technical solution, the operating plate is used to provide a fulcrum for rotating the pressing ring, making the disassembly and assembly operations of the pressing ring easier and more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0026] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of the middle part A;

[0027] Figure 3 It is a side view of the valve body of the utility model;

[0028] Figure 4 This is a schematic diagram of the structure of the locking slideway of the utility model;

[0029] Figure 5 It is a structural schematic diagram of the pressing ring of the utility model.

[0030] In the figure: 1. valve body; 2. upper valve stem; 3. lower valve stem; 5. hemispherical valve core; 6. valve seat; 7. locking assembly; 8. pressure ring; 9. slider; 10. mounting groove; 11. mounting part; 12. locking slide; 13. inlet and outlet; 14. contraction guide part; 15. locking part; 16. locking screw; 17. through hole; 18. screw hole; 19. screw head; 20. threaded section; 21. optical axis section; 22. guide dome; 23. recessed part; 24. gasket; 25. annular groove; 26. sealing ring; 27. first annular protrusion; 28. second annular protrusion; 29. ​​wear-resistant coating; 30. operating panel. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] Example: As attached Figures 1 to 5A hard-sealed eccentric hemispherical valve shown in the figure comprises a valve body 1, an upper valve stem 2, a lower valve stem 3, a hemispherical valve core 5 and a valve seat 6 (the valve seat 6 and the hemispherical valve core 5 are made of the same material, both made of metal), the upper valve stem 2 and the lower valve stem 3 are respectively mounted at the upper and lower ends of the valve body 1, the hemispherical valve core 5 is arranged in the valve body 1, and the inner end of the upper valve stem 2 is linked to the hemispherical valve core 5 (can be connected by screws), the inner end of the lower valve stem 3 is rotatably connected to the hemispherical valve core 5 (simple shaft hole matching), and the valve seat 6 is mounted in the valve body 1 to form a sealing match with the hemispherical valve core 5 when the valve is closed; the ball valve also includes a locking component 7 for locking the valve seat 6 in the valve body 1 The locking assembly 7 includes a pressure ring 8, and a plurality of sliders 9 are arranged on the outer periphery of the pressure ring 8. The sliders 9 and the pressure ring 8 are an integrated structure. An inwardly extending mounting groove 10 is provided at one end of the valve body 1, and a mounting portion 11 is provided on the valve seat 6. The mounting portion 11 is arranged in the mounting groove 10. A plurality of locking slideways 12 corresponding to the number of the sliders 9 are circumferentially arranged on the inner side of the mounting groove 10, and an inlet and outlet 13 for the corresponding sliders 9 to slide into the locking slideway 12 is also opened at the end of the valve body 1. The outer ends of the inlet and outlet 13 are expanded. When the slider 9 slides into the locking slideway 12, the mounting portion 11 of the valve seat 6 is pressed against the inner end of the mounting groove 10. During installation, it is only necessary to press the mounting portion 11 of the valve seat 6 into the inner end of the mounting groove 10 first, and then slide the slider 9 of the pressing ring 8 axially into the corresponding inlet and outlet 13. When the slider 9 corresponds to the inner end of the inlet and outlet 13, rotate the pressing ring 8 circumferentially to slide the slider 9 on the pressing ring 8 completely into the inner end of the corresponding locking slideway 12 to complete the installation of the pressing ring 8. At this time, the pressing ring 8 presses the mounting portion 11 of the valve seat 6 against the end of the mounting groove 10 to achieve the installation of the valve seat 6. The mounting structure is simple and reliable. During use, the valve seat 6 and the pressing ring 8 will not produce axial movement, which ensures the sealing reliability of the closed state and is safer and more reliable to use.

[0033] As attached Figure 3 and attached Figure 4 As shown, the locking slideway 12 includes a contraction guide portion 14 and a locking portion 15 in sequence in the direction away from the corresponding inlet and outlet 13. The height of the contraction guide portion 14 gradually decreases in the direction close to the locking portion 15. When the slider 9 slides into the locking portion 15, the slider 9 and the locking portion 15 have an interference fit (a tight fit is sufficient). The process of the slider 9 sliding into the locking slideway 12 is from loose to tight, which is not only convenient for installation, but also difficult to produce axial slip when the slider 9 cooperates with the locking portion 15, thereby improving the stability of the installation structure of the pressing ring 8.

[0034] As attached Figure 2As shown, the locking assembly 7 also includes locking screws 16 whose number is equivalent to that of the slider 9, a through hole 17 is provided on the slider 9, and a screw hole 18 connected to the locking portion 15 is provided at the end of the valve body 1 corresponding to the locking portion 15 of the locking slide 12, and the diameter of the through hole 17 is smaller than the diameter of the screw hole 18. When the slider 9 slides into the locking portion 15 corresponding to the locking slide 12, the through hole 17 is coaxial with the screw hole 18, and the locking screw 16 includes a screw head 19, a threaded section 20 and an optical axis section 21 in sequence along the axial direction, and the threaded section 20 is threadedly connected to the corresponding screw hole 18, the screw head 19 is tightly abutted against the outer end of the valve body 1, and the optical axis section 21 is inserted into the corresponding through hole 17, and the diameter of the optical axis section 21 is equivalent to the diameter of the through hole 17. After the slider 9 of the pressing ring 8 slides to the locking portion 15, the pressing ring 8 is locked by the locking screw 16, which further limits its circumferential movement, thereby effectively ensuring the stability of the installation structure.

[0035] As attached Figure 2 As shown, the inner end of the optical axis segment 21 is provided with a guide dome 22. The dome provided at the inner end of the optical axis segment 21 plays a guiding role for inserting the circular hole of the pressing ring 8, which is beneficial to the installation operation of the locking screw 16.

[0036] As attached Figure 2 As shown, the end of the valve body 1 is provided with a recessed portion 23 for completely embedding the screw head 19. This design prevents the screw head 19 of the locking screw 16 from protruding from the end surface of the valve body 1, facilitating the subsequent connection of the valve body 1 with the pipeline.

[0037] As attached Figure 2 As shown, a gasket 24 is sandwiched between the pressure ring 8 and the valve seat 6, and the gasket 24 is made of metal. The gasket 24 plays a role in protecting the end surface of the pressure ring 8 and the valve seat 6, which can reduce the wear between the two and increase the service life of the valve.

[0038] As attached Figure 2 As shown, an annular groove 25 is formed at the inner end of the mounting portion 11 of the valve seat 6, and a sealing ring 26 is embedded in the annular groove 25 for forming a sealing match with the inner end of the mounting groove 10. This design can improve the sealing between the valve seat 6 and the inner wall of the valve body 1, and prevent the medium from leaking from the gap between the two when the valve is closed.

[0039] As attached Figure 2 As shown, the inner end of the annular groove 25 is provided with a first annular protrusion 27, the inner end of the mounting groove 10 is provided with a second annular protrusion 28, and the extrusion force of the first annular protrusion 27 on the sealing ring 26 is directed toward the second annular protrusion 28. This design can further improve the sealing performance between the valve seat 6 and the inner wall of the valve body 1.

[0040] As attached Figure 2As shown, the contact portion between the valve seat 6 and the hemispherical valve core 5 is provided with a wear-resistant coating 29. The wear-resistant coating 29 is made of materials such as T-800, CrC, etc., which have high wear resistance at high temperatures and can effectively improve the service life of the valve seat 6.

[0041] As attached Figure 1 and attached Figure 5 As shown, a plurality of operating plates 30 are arranged on the inner wall of the pressing ring 8 along the circumferential direction. The operating plates 30 and the pressing ring 8 can be an integrated structure, and the operating plates 30 can also be welded on the inner wall of the pressing ring 8. The operating plates 30 are used to provide a fulcrum for rotating the pressing ring 8, making the disassembly and assembly of the pressing ring 8 easier and more convenient.

Claims

1. A hard-sealed eccentric hemispherical valve, comprising a valve body (1), an upper valve stem (2), a lower valve stem (3), a hemispherical valve core (5) and a valve seat (6), wherein the upper valve stem (2) and the lower valve stem (3) are respectively mounted at the upper and lower ends of the valve body (1), the hemispherical valve core (5) is arranged in the valve body (1), and the inner end of the upper valve stem (2) is linked to the hemispherical valve core (5), the inner end of the lower valve stem (3) is rotatably connected to the hemispherical valve core (5), and the valve seat (6) is mounted in the valve body (1) to form a sealing fit with the hemispherical valve core (5) when the valve is closed; characterized in that: It also includes a locking assembly (7) for locking the valve seat (6) in the valve body (1), the locking assembly (7) including a pressure ring (8), a plurality of sliders (9) being arranged on the outer periphery of the pressure ring (8), an inwardly extending mounting groove (10) being arranged at one end of the valve body (1), a mounting portion (11) being arranged on the valve seat (6), the mounting portion (11) being arranged in the mounting groove (10), a plurality of locking slideways (12) being arranged along the circumferential direction on the inner side of the mounting groove (10) and the number of the locking slideways (12) being equal to the number of the sliders (9), and an inlet and outlet (13) for corresponding sliders (9) to slide into the locking slideways (12) is also provided at the end of the valve body (1), when the sliders (9) slide into the locking slideways (12), the mounting portion (11) of the valve seat (6) is pressed against the inner end of the mounting groove (10).

2. A hard-sealed eccentric hemispherical valve according to claim 1, characterized in that: The locking slideway (12) includes a contraction guide portion (14) and a locking portion (15) in sequence in a direction away from the corresponding inlet and outlet (13); the height of the contraction guide portion (14) gradually decreases in a direction approaching the locking portion (15); when the slider (9) slides into the locking portion (15), the slider (9) and the locking portion (15) are interference fit.

3. A hard-sealed eccentric hemispherical valve according to claim 2, characterized in that: The locking assembly (7) further comprises locking screws (16) whose number is equal to that of the slider (9); a through hole (17) is provided on the slider (9); a screw hole (18) connected to the locking portion (15) is provided at the end of the valve body (1) at a position corresponding to the locking portion (15) of the locking slideway (12); when the slider (9) slides into the locking portion (15) corresponding to the locking slideway (12), the through hole (17) is coaxial with the screw hole (18); the locking screw (16) comprises a screw head (19), a threaded section (20) and an optical axis section (21) in sequence along the axial direction; the threaded section (20) is threadedly connected to the corresponding screw hole (18); the screw head (19) is tightly abutted against the outer end of the valve body (1); and the optical axis section (21) is inserted into the corresponding through hole (17).

4. A hard-sealed eccentric hemispherical valve according to claim 3, characterized in that: A guide dome (22) is provided at the inner end of the optical axis segment (21).

5. The hard-sealed eccentric hemispherical valve according to claim 3, characterized in that: The end of the valve body (1) is provided with a recessed portion (23) for completely embedding the screw head (19).

6. The hard-sealed eccentric hemispherical valve according to claim 1, characterized in that: A gasket (24) is sandwiched between the pressure ring (8) and the valve seat (6).

7. The hard-sealed eccentric hemispherical valve according to claim 1, characterized in that: An annular groove (25) is provided at the inner end of the mounting portion (11) of the valve seat (6), and a sealing ring (26) is embedded in the annular groove (25) for forming a sealing fit with the inner end of the mounting groove (10).

8. The hard-sealed eccentric hemispherical valve according to claim 7, characterized in that: A first annular protrusion (27) is provided at the inner end of the annular groove (25), and a second annular protrusion (28) is provided at the inner end of the mounting groove (10), wherein the extrusion force of the first annular protrusion (27) on the sealing ring (26) is directed toward the second annular protrusion (28).

9. The hard-sealed eccentric hemispherical valve according to claim 1, characterized in that: A wear-resistant coating (29) is provided at the portion where the valve seat (6) contacts the hemispherical valve core (5).

10. The hard-sealed eccentric hemispherical valve according to claim 1, characterized in that: A plurality of operating plates (30) are arranged on the inner wall of the pressure ring (8) along the circumferential direction.

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