Valve rod structure of large-diameter ball valve

Abstract

The utility model relates to the technical field of valves, in particular to a large-diameter ball valve rod structure which comprises a valve body, a ball body and a valve rod, the ball body and the valve rod are both rotationally connected to the valve body, and a mounting hole used for avoiding the valve rod is formed in the ball body; a plurality of connecting assemblies used for connecting the valve rod to the ball body are detachably arranged at the bottom of the valve rod, any connecting assembly is arranged in the mounting hole, and the valve rod can be fixed to the ball body through the arrangement of the connecting assemblies; therefore, the possibility that the valve rod is pushed out of the valve body due to the internal pressure of a medium is effectively reduced, and a worker can conveniently assemble and disassemble the valve rod and the ball body through the detachable arrangement of the connecting assembly; and meanwhile, due to the fact that the multiple connecting assemblies are arranged, the stability and safety of the valve rod in the working process are enhanced.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and in particular to a large-diameter ball valve stem structure. Background Art

[0002] At present, ball valves are widely used in pipelines to cut off medium flow, change the flow direction of medium flow, or in situations where rapid opening and closing are required.

[0003] The ball valve structure in the prior art includes a valve body, a ball and a valve stem. The ball and the valve stem are both arranged inside the valve body. The valve body and the valve stem form a rotational connection. A stepped surface is provided on the valve body, a convex surface is provided on the valve stem, and a block-shaped adapter groove is provided on the ball. The valve stem and the adapter groove form a plug-in fit, so that when the valve stem is rotated, the ball can be driven to rotate. In order to prevent the valve stem from being pushed out of the valve body due to the internal pressure of the medium during operation, the stepped surface of the valve body and the convex surface of the valve stem are generally abutted against each other, so that the valve stem and the stuffing box form a snap-fit ​​fit.

[0004] However, this clamping fixation method is only applicable to small-diameter ball valve stem structures. For large-diameter ball valve stem structures, a larger stuffing box is required, and more bolts are needed to fix the stuffing box to ensure that the valve stem is not easily pushed out of the valve body under high-pressure conditions. However, this fixing method is costly and there is room for improvement. Utility Model Content

[0005] In order to prevent the valve stem of a large-diameter ball valve from being easily pushed out of the valve body during operation, the present application provides a valve stem structure of a large-diameter ball valve.

[0006] This application provides a large-diameter ball valve stem structure, which adopts the following technical solutions:

[0007] A large-diameter ball valve stem structure includes a valve body, a sphere and a valve stem. The sphere and the valve stem are both rotatably connected to the valve body. The sphere is provided with a mounting hole for avoiding the valve stem. The bottom of the valve stem is detachably provided with a connecting component for connecting the valve stem to the sphere. There are several connecting components, and any one of the connecting components is arranged in the mounting hole.

[0008] By adopting the above technical solution and utilizing the setting of the connecting assembly, the valve stem can be fixed on the ball, thereby effectively reducing the possibility of the valve stem being pushed out of the valve body due to the internal pressure of the medium, and utilizing the detachable setting of the connecting assembly, it is convenient for the staff to assemble and disassemble the valve stem and the ball; at the same time, since there are several connecting assemblies, the stability and safety of the valve stem during operation are enhanced.

[0009] Preferably, the connecting assembly includes a cylindrical pin and an elastic pin, the cylindrical pin is plugged in between the valve stem and the sphere, a limiting hole is provided on the cylindrical pin, a limiting groove is provided on the valve stem, the limiting hole and the limiting groove are coaxially arranged, the elastic pin is plugged in the limiting hole, and one end of the elastic pin forms an abutment fit with the side wall of the mounting hole of the sphere, and the other end forms an abutment fit with the limiting groove of the valve stem.

[0010] By adopting the above technical solution, the position of the elastic pin is limited by the limiting hole on the cylindrical pin, and one end of the elastic pin is abutted against the side wall of the mounting hole of the sphere, and the other end is abutted against the limiting groove of the valve stem. The elastic pin can simultaneously press the sphere and the valve stem at both ends due to pressure, thereby achieving a reliable connection between the valve stem and the sphere.

[0011] Preferably, a stuffing box is sleeved on the valve stem, the stuffing box is fixed on the valve body, and a spiral wound gasket is provided between the stuffing box and the valve body for sealing the gap between the stuffing box and the valve body.

[0012] By adopting the above technical solution, packing the stuffing box helps to enhance the sealing between the valve body and the valve stem. At the same time, the provision of the spiral wound gasket strengthens the sealing between the stuffing box and the valve body.

[0013] Preferably, a sealing assembly for sealing the gap between the valve stem and the valve body is provided on the valve stem, and the sealing assembly includes a flexible dust ring for preventing impurities in the medium from entering the gap between the valve body and the valve stem. The flexible dust ring is sleeved on the valve stem, and the side wall of the flexible dust ring forms an abutment fit with the valve body.

[0014] By adopting the above technical solution and utilizing the setting of the flexible dustproof ring, the flexible dustproof ring can prevent external dust from entering the gap between the valve body and the valve stem, thereby reducing the possibility of friction damage to the valve stem caused by dust accumulation during long-term use.

[0015] Preferably, the sphere is provided with a limiting sleeve for limiting the position of the sphere, and the sphere is also provided with a first shaft sleeve and a friction-reducing gasket. The limiting sleeve is sleeved on the first shaft sleeve, and the limiting sleeve forms an abutting fit with the friction-reducing gasket.

[0016] By adopting the above technical solution, the position of the sphere is limited by the setting of the limit sleeve, thereby preventing the sphere from shifting in position during rotation; at the same time, the friction between the sphere and the limit sleeve is reduced by the setting of the first shaft sleeve and the friction-reducing gasket, thereby extending the service life of the sphere.

[0017] Preferably, the sealing assembly also includes a second sleeve and a thrust washer, the flexible dust ring is arranged between the second sleeve and the thrust washer, the upper surface of the flexible dust ring forms an abutment fit with the second sleeve, and the lower surface of the flexible dust ring forms an abutment fit with the thrust washer.

[0018] By adopting the above technical solution, the flexible dust ring can be pressed more closely against the valve stem and valve body under the joint extrusion of the second sleeve and the thrust washer, thereby preventing impurities in the medium from entering the valve stem gap while also playing a sealing role.

[0019] Preferably, a packing sleeve for compressing the packing inside the stuffing box is sleeved on the valve stem, and the packing sleeve is arranged between the valve stem and the stuffing box.

[0020] By adopting the above technical solution and utilizing the pressing effect of the packing gland, the packing in the stuffing box can fit tightly against the valve stem, thereby improving the sealing effect.

[0021] Preferably, a packing gland is sleeved on the valve stem, and the packing gland is fixed to the stuffing box by bolts. The packing gland is located above the packing gland and forms an abutment fit with the packing gland.

[0022] By adopting the above technical solution, by screwing the bolts on the packing gland, the packing gland is pushed downward to press the packing sleeve, thereby driving the packing sleeve to press the packing in the stuffing box downward, further improving the sealing between the valve body and the valve stem.

[0023] Preferably, the valve stem is provided with a snap-fit ​​groove and a blocking ring for preventing the valve stem from being pushed out by the internal pressure of the medium. The blocking ring is snap-fitted in the snap-fit ​​groove, and the lower surface of the blocking ring forms an abutment fit with the upper surface of the packing gland.

[0024] By adopting the above technical solution and utilizing the setting of the blocking ring, the valve stem is prevented from falling into the sphere due to its own gravity when the valve stem is not in operation because there is no pressure in the valve body.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. The connection assembly allows the valve stem to be fixed to the ball, effectively reducing the possibility of the valve stem being pushed out of the valve body due to the internal pressure of the medium. The detachable connection assembly facilitates the assembly and disassembly of the valve stem and ball. At the same time, the presence of multiple connection assemblies enhances the stability and safety of the valve stem during operation.

[0027] 2. The position of the elastic pin is limited by the limiting hole on the cylindrical pin, and one end of the elastic pin forms an abutment fit with the side wall of the mounting hole of the ball, and the other end forms an abutment fit with the limiting groove of the valve stem. The elastic pin can simultaneously press the ball and valve stem at both ends due to pressure, thereby achieving a reliable connection between the valve stem and the ball;

[0028] 3. The blocking ring is used to prevent the valve stem from falling into the ball due to its own gravity when there is no pressure in the valve body when the valve is not working. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a cross-sectional view mainly showing the internal structure of the valve stem in the embodiment of the present application;

[0030] Figure 2 yes Figure 1 The figure mainly shows a partial enlarged view of the sealing component structure.

[0031] 1. Valve body; 2. sphere; 21. mounting hole; 22. semi-cylindrical hole; 23. mounting portion; 231. limiting sleeve; 232. first sleeve; 233. friction-reducing gasket; 24. circulation portion; 3. valve stem; 31. rotating portion; 32. connecting portion; 321. semi-cylindrical groove; 322. limiting groove; 33. connecting assembly; 331. cylindrical pin; 3311. limiting hole; 332. elastic pin; 34. sealing assembly; 341. flexible dust ring; 342. second sleeve; 343. thrust washer; 35. stuffing box; 351. annular chamber; 352. spiral wound gasket; 353. sealing ring; 36. packing sleeve; 37. packing cover; 38. card slot; 39. blocking ring. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1 -Attached Figure 2 This application is described in further detail.

[0033] The embodiment of the present application discloses a large-diameter ball valve stem structure.

[0034] Reference Figure 1 A large-diameter ball valve stem structure includes a valve body 1, a ball 2 and a valve stem 3. The interior of the valve body 1 is hollow, and the ball 2 and the valve stem 3 are both rotatably connected to the interior of the valve body 1. A cylindrical mounting hole 21 is provided on the ball 2. The valve stem 3 includes a rotating portion 31 and a connecting portion 32. The rotating portion 31 and the connecting portion 32 are integrally formed. A connecting component 33 for connecting the valve stem 3 to the ball 2 is detachably provided on the connecting portion 32 of the valve stem 3. Several connecting components 33 are provided. In this embodiment, two connecting components 33 are symmetrically provided. The connecting portion 32 of the valve stem 3 and any connecting component 33 are both arranged in the mounting hole 21.

[0035] Reference Figure 1 The connection assembly 33 is used to fix the valve stem 3 on the ball 2, thereby effectively reducing the possibility of the valve stem 3 being pushed out of the valve body 1 due to the internal pressure of the medium. The detachable setting of the connection assembly 33 facilitates the assembly and disassembly of the valve stem 3 and the ball 2 by the staff. At the same time, since there are two connection assemblies 33, the stability and safety of the valve stem 3 during operation are enhanced.

[0036] Reference Figure 1 Since the structures and connection methods of the two connection components 33 are the same, one of the connection components 33 is used as an example for explanation.

[0037] Reference Figure 1 The connecting assembly 33 includes a cylindrical pin 331 and an elastic pin 332. A semi-cylindrical hole 22 in the shape and size of half of the cylindrical pin 331 is opened on the sphere 2. The semi-cylindrical hole 22 is set at the notch of the mounting hole 21. A semi-cylindrical groove 321 is opened from bottom to top on the connecting portion 32 of the valve stem 3 to match the shape and size of the other half of the cylindrical pin 331. The semi-cylindrical hole 22 is connected to the semi-cylindrical groove 321, and the semi-cylindrical hole 22 and the semi-cylindrical groove 321 together provide an adaptive installation space for the cylindrical pin 331, and the upper end of the cylindrical pin 331 forms an abutment fit with the top surface of the semi-cylindrical groove 321.

[0038] Reference Figure 1 Since the upper and lower ends of the semi-cylindrical hole 22 are both through-set, the upper end of the semi-cylindrical groove 321 is closed, and the lower end of the semi-cylindrical groove 321 is open, the cylindrical pin 331 can only be inserted vertically from bottom to top into the installation space formed by the semi-cylindrical hole 22 and the semi-cylindrical groove 321, so that the cylindrical pin 331 can be plugged and fitted between the connecting portion 32 of the valve stem 3 and the ball 2.

[0039] Reference Figure 1 A limiting hole 3311 is provided on the cylindrical pin 331 along its radial direction, and a limiting groove 322 is provided on the connecting portion 32 of the valve stem 3. The limiting hole 3311 and the limiting groove 322 are coaxially arranged. The limiting groove 322 is communicated with the semi-cylindrical groove 321. The elastic pin 332 is plugged into the limiting hole 3311, and one end of the elastic pin 332 forms an abutment fit with the side wall of the mounting hole 21 of the sphere 2, and the other end forms an abutment fit with the limiting groove 322 of the valve stem 3.

[0040] Reference Figure 1The position of the elastic pin 332 is limited by the limiting hole 3311 on the cylindrical pin 331, and one end of the elastic pin 332 is in abutment with the side wall of the mounting hole 21 of the ball 2, and the other end is in abutment with the limiting groove 322 of the valve stem 3, so that the elastic pin 332 can simultaneously press the ball 2 and the valve stem 3 at both ends due to the pressure at both ends, thereby realizing a reliable connection between the valve stem 3 and the ball 2, and further ensuring that the valve stem 3 is difficult to be pushed out of the valve body 1 under high pressure conditions.

[0041] Reference Figure 1 The ball 2 includes a mounting portion 23 and a circulation portion 24. The mounting portion 23 and the circulation portion 24 are integrally formed. A limiting sleeve 231, a first shaft sleeve 232 and a friction-reducing gasket 233 are sleeved on the mounting portion 23 of the ball 2. The limiting sleeve 231 is used to limit the position of the ball 2 in the valve body 1 to prevent the ball 2 from shifting during rotation; the limiting sleeve 231 is sleeved on the first shaft sleeve 232, and the limiting sleeve 231 and the friction-reducing gasket 233 form an abutment fit. The arrangement of the first shaft sleeve 232 and the friction-reducing gasket 233 reduces the friction between the ball 2 and the limiting sleeve 231, thereby extending the service life of the ball 2.

[0042] Reference Figure 1 and Figure 2 A sealing assembly 34 for sealing the gap between the valve stem 3 and the valve body 1 is provided on the valve stem 3. The sealing assembly 34 includes a flexible dust ring 341. The flexible dust ring 341 is sleeved on the valve stem 3, and the side wall of the flexible dust ring 341 forms an abutment fit with the valve body 1. The flexible dust ring 341 is used to prevent impurities in the medium from entering the gap between the valve body 1 and the valve stem 3, thereby reducing the possibility of friction damage to the valve stem 3 due to dust accumulation during long-term use.

[0043] Reference Figure 1 and Figure 2 The sealing assembly 34 also includes a second sleeve 342 and a thrust washer 343. The flexible dust ring 341 is arranged between the sleeve and the thrust washer 343. The upper surface of the flexible dust ring 341 forms an abutment fit with the sleeve, and the lower surface of the flexible dust ring 341 forms an abutment fit with the thrust washer 343. Therefore, under the joint extrusion of the second sleeve 342 and the thrust washer 343, the flexible dust ring 341 can be pressed more closely to the valve stem 3 and the valve body 1, thereby preventing impurities in the medium from entering the gap of the valve stem 3 while also playing a sealing role.

[0044] Reference Figure 1 and Figure 2A stuffing box 35 is sleeved on the valve stem 3. An annular chamber 351 for packing sealing is formed between the stuffing box 35 and the valve stem 3. Filling the annular chamber 351 helps to enhance the sealing between the valve body 1 and the valve stem 3. The stuffing box 35 is fixed on the valve body 1. In this embodiment, the stuffing box 35 is threadedly connected to the valve body 1 by bolts.

[0045] Reference Figure 1 and Figure 2 A spiral wound gasket 352 is installed between the stuffing box 35 and the valve body 1. The spiral wound gasket 352 helps to seal the gap between the stuffing box 35 and the valve body 1, thereby improving the sealing between the stuffing box 35 and the valve body 1.

[0046] Reference Figure 1 and Figure 2 An O-shaped sealing ring 353 is installed between the stuffing box 35 and the valve body 1, and between the valve stem 3 and the stuffing box 35. The setting of the sealing ring 353 further strengthens the sealing between the stuffing box 35 and the valve body 1, and between the valve stem 3 and the stuffing box 35.

[0047] Reference Figure 1 A packing sleeve 36 is provided on the valve stem 3 for compressing the packing inside the stuffing box 35. The packing sleeve 36 is arranged between the valve stem 3 and the stuffing box 35. The packing in the stuffing box 35 can fit tightly against the valve stem 3 by the pressing effect of the packing sleeve 36, thereby improving the sealing effect.

[0048] Reference Figure 1 A packing gland 37 is sleeved on the valve stem 3, and the packing gland 37 is fixed to the stuffing box 35 by bolts. The lower surface of the packing gland 37 forms an abutment fit with the upper surface of the packing gland 36. By screwing the bolts on the packing gland 37, the packing gland 37 is pressed downward against the packing gland 36, thereby driving the packing gland 36 to press the packing in the stuffing box 35 downward, further improving the sealing between the valve body 1 and the valve stem 3.

[0049] Reference Figure 1 The valve stem 3 is provided with a card slot 38 and a blocking ring 39. The blocking ring 39 is used to prevent the valve stem 3 from being pushed out by the internal pressure of the medium. The blocking ring 39 is card-fitted in the card slot 38. The lower surface of the blocking ring 39 forms an abutment fit with the upper surface of the packing gland 37. The setting of the blocking ring 39 prevents the valve stem 3 from falling into the flow portion 24 of the ball 2 due to its own gravity when there is no pressure in the valve body 1 when the valve is not working.

[0050] The implementation principle of the embodiment of the present application is: through the arrangement of the cylindrical pin 331 and the elastic pin 332 on the connecting portion 32 of the valve stem 3, the elastic pin 332 is pressed against the ball 2 and the valve stem 3 at both ends thereof, thereby achieving a reliable connection between the valve stem 3 and the ball 2, and further ensuring that the valve stem 3 is difficult to be pushed out of the valve body 1 under high pressure conditions.

[0051] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A large-caliber ball valve stem structure, characterized by: The invention comprises a valve body (1), a sphere (2) and a valve stem (3), wherein the sphere (2) and the valve stem (3) are both rotatably connected to the valve body (1), the sphere (2) is provided with a mounting hole (21) for avoiding the valve stem (3), and the bottom of the valve stem (3) is detachably provided with a connecting component (33) for connecting the valve stem (3) to the sphere (2), and a plurality of connecting components (33) are provided, and any one of the connecting components (33) is arranged in the mounting hole (21).

2. A large-diameter ball valve stem structure according to claim 1, characterized in that: The connecting assembly (33) comprises a cylindrical pin (331) and an elastic pin (332). The cylindrical pin (331) is plugged and fitted between the valve stem (3) and the sphere (2). A limiting hole (3311) is provided on the cylindrical pin (331), and a limiting groove (322) is provided on the valve stem (3). The limiting hole (3311) and the limiting groove (322) are coaxially arranged. The elastic pin (332) is plugged and fitted in the limiting hole (3311), and one end of the elastic pin (332) forms an abutment fit with the side wall of the mounting hole (21) of the sphere (2), and the other end forms an abutment fit with the limiting groove (322) of the valve stem (3).

3. The large-diameter ball valve stem structure according to claim 1, characterized in that: A stuffing box (35) is sleeved on the valve stem (3), and the stuffing box (35) is fixed on the valve body (1). A spiral wound gasket (352) is provided between the stuffing box (35) and the valve body (1) for sealing the gap between the stuffing box (35) and the valve body (1).

4. The large-diameter ball valve stem structure according to claim 1, characterized in that: The valve stem (3) is provided with a sealing assembly (34) for sealing the gap between the valve stem (3) and the valve body (1). The sealing assembly (34) includes a flexible dust ring (341) for preventing impurities in the medium from entering the gap between the valve body (1) and the valve stem (3). The flexible dust ring (341) is sleeved on the valve stem (3), and the side wall of the flexible dust ring (341) forms an abutting fit with the valve body (1).

5. The large-diameter ball valve stem structure according to claim 1, characterized in that: The sphere (2) is provided with a limiting sleeve (231) for limiting the position of the sphere (2), and the sphere (2) is also sleeved with a first shaft sleeve (232) and a friction-reducing washer (233). The limiting sleeve (231) is sleeved on the first shaft sleeve (232), and the limiting sleeve (231) and the friction-reducing washer (233) form an abutting fit.

6. The large-diameter ball valve stem structure according to claim 4, characterized in that: The sealing assembly (34) further includes a second shaft sleeve (342) and a thrust washer (343); the flexible dust ring (341) is arranged between the second shaft sleeve (342) and the thrust washer (343); the upper surface of the flexible dust ring (341) forms an abutment fit with the second shaft sleeve (342); and the lower surface of the flexible dust ring (341) forms an abutment fit with the thrust washer (343).

7. The large-diameter ball valve stem structure according to claim 3, characterized in that: The valve stem (3) is sleeved with a packing sleeve (36) for compressing the internal packing of the packing box (35), and the packing sleeve (36) is arranged between the valve stem (3) and the packing box (35).

8. The large-diameter ball valve stem structure according to claim 7, characterized in that: A packing gland (37) is sleeved on the valve stem (3), and the packing gland (37) is fixed to the stuffing box (35) by means of bolts. The packing gland (37) is located above the packing gland (36) and forms an abutment fit with the packing gland (36).

9. The large-diameter ball valve stem structure according to claim 8, characterized in that: The valve stem (3) is provided with a locking groove (38) and a blocking ring (39) for blocking the valve stem (3) from being pushed out by the internal pressure of the medium. The blocking ring (39) is locked in the locking groove (38), and the lower surface of the blocking ring (39) forms an abutment fit with the upper surface of the packing gland (37).

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