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CN-224229310-U - Low leakage structure of valve rod of all-welded fixed ball valve

CN224229310UCN 224229310 UCN224229310 UCN 224229310UCN-224229310-U

Abstract

The utility model discloses a low-leakage structure of a valve rod of an all-welded fixed ball valve, and relates to the technical field of ball valve assemblies. The utility model comprises a shaft sleeve, a screw cap, a lifting piston, a valve rod and an elastic sleeve, wherein a supporting ring is fixed at the lower part in the shaft sleeve, the lifting piston is arranged at the top end of the supporting ring, supporting rods are fixed at the top ends of the lifting piston in an annular array, a pushing disc is jointly fixed at the top ends of all the supporting rods, the screw cap is connected at the top end of the shaft sleeve in a threaded manner, the valve rod is movably connected in the screw cap in a penetrating manner, the valve rod vertically penetrates through the supporting ring, a pressure plate is fixed at the upper part of the periphery of the valve rod, the pressure plate is abutted to the inner top part of the screw cap, and the elastic sleeve is movably connected in the shaft sleeve between the pressure plate and the pushing disc. According to the utility model, the shaft sleeve, the nut, the lifting piston, the valve rod and the elastic sleeve are arranged, so that the problems that the sealing effect between the valve rod and the ball valve shell of the all-welded ball valve is not good enough and the valve rod is not convenient to replace are solved.

Inventors

  • WANG YIJIE
  • AN HAIBO
  • LUO RUI
  • CHENG HAIBO

Assignees

  • 东裕(桐柏)精密金属有限公司

Dates

Publication Date
20260512
Application Date
20250630

Claims (6)

  1. 1. The utility model provides a low leakage structure of full welded fastening ball valve rod, includes axle sleeve (1), nut (2), lift piston (3), valve rod (4) and elastic sleeve (5), wherein lower part is fixed with supporting ring (103) in axle sleeve (1), the top of supporting ring (103) is provided with lift piston (3), the top of lift piston (3) is annular array and is fixed with bracing piece (303), all the top of bracing piece (303) is fixed with pushing disc (304) jointly, the top threaded connection of axle sleeve (1) has nut (2), link up swing joint has valve rod (4) in nut (2), valve rod (4) vertically link up and pass supporting ring (103), the periphery upper portion of valve rod (4) is fixed with pressure disk (402) to pressure disk (402) butt is at the interior top of nut (2), and swing joint has elastic sleeve (5) in axle sleeve (1) between pressure disk (402) and the pushing disc (304).
  2. 2. The low leakage structure of the valve rod of the all-welded and fixed ball valve of claim 1, wherein the bottom end of the shaft sleeve (1) is fixedly communicated with the valve body (101), a limiting ring (102) is fixed at the upper part of the periphery side of the shaft sleeve (1), and the bottom end of the nut (2) is mutually abutted with the limiting ring (102).
  3. 3. The low leakage structure of the valve rod of the all-welded and fixed ball valve of claim 1, wherein grips (202) are fixed on the periphery of the nut (2) in an annular array, a movable hole (201) is formed in the center of the top end of the nut (2), and the valve rod (4) penetrates through the movable hole (201) and extends out of the top end of the nut (2).
  4. 4. The low leakage structure of the valve rod of the all-welded fixed ball valve of claim 1, wherein an outer sealing sleeve (301) is fixed on the periphery of the lifting piston (3), the bottom end of the outer sealing sleeve (301) is supported and arranged on the supporting ring (103), the outer sealing sleeve (301) is movably connected in the shaft sleeve (1), an inner sealing ring (302) is fixed on the inner ring of the lifting piston (3), and the inner sealing ring (302) is movably connected on the periphery of the valve rod (4).
  5. 5. The low leakage structure of the valve rod of the all-welded and fixed ball valve according to claim 1, wherein a pin block (401) is fixed at the bottom end of the valve rod (4), and a mounting block (403) is fixed at the top end of the valve rod (4).
  6. 6. The low leakage structure of the valve rod of the all-welded and fixed ball valve of claim 1, wherein the elastic sleeve (5) is arranged in a hollow mode, a rubber filling disc (501) is filled in the elastic sleeve (5), and the elastic sleeve (5) is movably connected to the periphery of the valve rod (4).

Description

Low leakage structure of valve rod of all-welded fixed ball valve Technical Field The utility model belongs to the technical field of ball valve assemblies, and particularly relates to a low-leakage structure of a valve rod of an all-welded fixed ball valve. Background The all-welded ball valve is a valve widely applied to the fields of petroleum, chemical industry, natural gas and the like, is formed by welding steel pipes, has two structures of a sphere and a barrel, is generally provided with only one welding joint, is provided with two welding joints, adopts an explosion-proof design, and is also provided with an explosion-proof design to prevent the valve rod from being sprayed out due to improper operation, but the following defects still exist in actual use: In the use process of the all-welded ball valve, a valve rod on the valve rod extends out of the shell of the ball valve and is connected with a handle for rotation control, and the position of the valve rod extending out of the ball valve is easy to leak due to the action of internal pressure, so that the sealing effect of the valve is not good enough; secondly, the valve rod of valve is in the installation, adopts to be connected with the bearing seal in the shell, installs, but is connected with seal structure such as bearing seal and need adopt interference fit, and to component cooling or intensification, the operation is comparatively troublesome to the valve rod changes the operation and damages structure such as bearing seal easily, and the operation is inconvenient. Disclosure of utility model The utility model aims to provide a low-leakage structure of an all-welded fixed ball valve rod, which solves the problems that the sealing effect between the all-welded ball valve rod and a ball valve shell is not good enough and the valve rod is not convenient to replace by arranging a shaft sleeve, a screw cap, a lifting piston, a valve rod and an elastic sleeve. The technical scheme includes that the low leakage structure of the valve rod of the all-welded ball valve comprises a shaft sleeve, a nut, lifting pistons, valve rods and an elastic sleeve, wherein a supporting ring is fixed at the inner lower portion of the shaft sleeve, the lifting pistons are arranged at the top ends of the supporting ring, supporting rods are fixed at the top ends of the lifting pistons in an annular array, pushing discs are jointly fixed at the top ends of all the supporting rods, the nut is connected with the top ends of the shaft sleeve in a threaded mode, the valve rods are movably connected in the nut in a penetrating mode, the valve rods vertically penetrate through the supporting ring, a pressure plate is fixed at the upper portion of the periphery of the valve rods, the pressure plate is abutted to the inner top of the nut, an elastic sleeve is movably connected in the shaft sleeve between the pressure plate and the pushing discs, the shaft sleeve seals the top ends of the shaft sleeve, after the elastic sleeve is pushed by the lifting pistons in lifting, the elastic sleeve is pressed between the elastic sleeve and the valve rods, the shaft sleeve is sealed between the shaft sleeve and the valve rods, and gaps between the shaft sleeve and the shaft sleeve are sealed after the elastic sleeve is pressed by the elastic sleeve. Further, the bottom fixed intercommunication of axle sleeve has the valve body, axle sleeve week side upper portion is fixed with the spacing ring to the bottom and the spacing ring butt each other of nut, and the valve body is when the valve rod rotates, and the fluid is carried the break-make in two pipelines of its connection of control, and the spacing ring on the axle sleeve limits the position of nut. The circumference of nut is annular array and is fixed with the handle, movable hole has been seted up to the top center of nut, the valve rod link up and passes the movable hole and stretch out the top of nut, and the nut during operation, the rotation handle drives the nut and rotates to valve rod swing joint is in the movable hole on the nut. The lifting piston is characterized in that an outer sealing sleeve is fixed on the periphery of the lifting piston, the bottom end support of the outer sealing sleeve is arranged on the support ring, the outer sealing sleeve is movably connected in the shaft sleeve, an inner sealing ring is fixed on the inner ring of the lifting piston, the inner sealing ring is movably connected on the periphery of the valve rod, the lifting piston seals a gap between the lifting piston and the shaft sleeve through the outer sealing sleeve, and the gap between the lifting piston and the lifting piston is sealed through the inner sealing ring. The bottom end of the valve rod is fixedly provided with a pin block, the top end of the valve rod is fixedly provided with a mounting block, the pin block on the valve rod is movably connected with a valve core in the valve body, and the mounting block is connected wit