CN-224214153-U - Double-spring reset structure for underground safety valve

CN224214153UCN 224214153 UCN224214153 UCN 224214153UCN-224214153-U

Abstract

The utility model relates to the technical field of reset structures, and provides a double-spring reset structure for an underground safety valve, which is used for accumulating force when the valve is opened and promoting a central tube to reset when the valve is closed. The utility model designs the existing upper spring and the lower spring which are installed on the top and are opposite in rotation direction, so that torsion generated by the upper spring and the lower spring can be mutually offset, and damage to a piston assembly is reduced.

Inventors

ZHONG XIANG
WANG YUXIANG
GU CHENGJIN

Assignees

成都若克石油股份有限公司

Dates

Publication Date: 20260508
Application Date: 20250523

Claims (6)

1. The double-spring reset structure for the underground safety valve is used for accumulating force when the valve is opened and promoting the central tube to reset when the valve is closed, and is characterized by comprising an upper spring and a lower spring, wherein the upper spring and the lower spring are oppositely arranged and oppositely rotated, the diameter of the upper spring is equal to that of the lower spring, the length of the upper spring is equal to that of the lower spring, and the opposite top surfaces of the upper spring and the lower spring are plane.
2. The double spring return structure for a subsurface safety valve according to claim 1, wherein an annular spacer is provided between the upper spring and the lower spring.
3. The double-spring return structure for a downhole safety valve according to claim 2, wherein positioning sinking grooves are formed in inner edges of two sides of the annular gasket, and the diameters of the positioning sinking grooves are equal to the outer diameters of the upper spring and the lower spring.
4. A double spring return structure for a subsurface safety valve according to any one of claims 1 to 3, wherein the lower end of the lower spring is supported by a planar bearing.
5. The double spring return structure for a downhole safety valve according to claim 4, wherein the planar bearing comprises a bearing body and a bearing seat, the bearing seat is fixedly arranged, the bearing seat is provided with a support ring groove, and the bearing body is installed in the support ring groove.
6. The dual spring return structure for a subsurface safety valve according to claim 5, wherein the position of said bearing housing is fixed by means of an elastic collar.

Description

Double-spring reset structure for underground safety valve Technical Field The utility model relates to the technical field of reset structures, in particular to a double-spring reset structure for an underground safety valve. Background The downhole safety valve is a downhole tool which is placed in a shaft, connected to an oil pipe, can prevent blowout and ensure production safety. When the pressure of underground fluid is abnormal, the pressure in the hydraulic control pipeline is cut off through the ground pressure control system, the central tube is reset under the action of the reset spring, the valve plate is reset under the action of the reset torsion spring, and the underground safety valve is closed, so that the production channel is disconnected. Therefore, the reset spring is an important reset structure of the central tube and plays an important role in the underground safety valve, and because the reset spring is of a spiral structure, torsion is generated when the reset spring is compressed, and for the large-volume underground safety valve, the torsion generated when the reset spring is compressed is large, and damage (deformation and bending) to the piston assembly is easy to cause. Disclosure of utility model The utility model aims to provide a double-spring reset structure for an underground safety valve, which solves the defects in the prior art. The utility model is realized by the following technical scheme: A double-spring reset structure for an underground safety valve is used for accumulating force when the valve is opened and promoting a central tube to reset when the valve is closed, and comprises an upper spring and a lower spring which are oppositely arranged and are opposite in rotation direction. Optionally, the diameter of the upper spring is equal to the diameter of the lower spring, and the length of the upper spring is equal to the length of the lower spring. Optionally, the upper spring and the lower spring are planar to the top surface. Optionally, an annular gasket is arranged between the upper spring and the lower spring. Optionally, the inner edges of two sides of the annular gasket are provided with positioning sinking grooves, and the diameters of the positioning sinking grooves are equal to the outer diameters of the upper spring and the lower spring. Optionally, the lower end of the lower spring is supported by a planar bearing. Optionally, the plane bearing comprises a bearing body and a bearing seat, the bearing seat is fixedly arranged, the bearing seat is provided with a support ring groove, and the bearing body is arranged in the support ring groove. Optionally, the position of the bearing seat is fixed by an elastic collar. The technical scheme of the utility model has at least the following advantages and beneficial effects: 1. In the utility model, the existing one spring is designed into the upper spring and the lower spring which are installed on the top and are opposite in rotation direction, so that torsion generated by the upper spring and the lower spring can be mutually offset, and damage to the piston assembly is reduced. 2. In the utility model, the diameters and the lengths of the upper spring and the lower spring are equal, so that the torsion values generated by the upper spring and the lower spring are equal, the mutual offset effect is improved, and the damage to the piston assembly is avoided as much as possible. 3. In the utility model, the lower end of the lower spring is provided with the plane bearing, and when the reset structure is compressed to generate torsion trend, the arrangement of the plane bearing can make the lower end of the reset structure reversely twist, so that torsion generated when the reset structure is compressed is avoided as much as possible. Drawings FIG. 1 is a state diagram of the double spring return structure for an underground safety valve according to the present utility model; fig. 2 is an enlarged view at a in fig. 1; FIG. 3 is an enlarged view at B in FIG. 2; FIG. 4 is an enlarged view at C in FIG. 2; The reference numerals comprise 1-upper springs, 2-lower springs, 3-annular gaskets, 4-bearing bodies, 5-bearing seats, 6-elastic clamping rings, 7-central tubes, 8-spring barrels and 9-piston assemblies. Detailed Description Referring to fig. 1, a dual spring return structure for an underground safety valve is used for accumulating force when the valve is opened and promoting the central tube 7 to return when the valve is closed, and it should be understood that the utility model is merely an improvement of the return structure and the installation structure thereof in the underground safety valve, and other structures of the underground safety valve and the installation position of the return structure can be realized by those skilled in the art on the basis of the prior art and the common knowledge in the art. As a structure in the prior art, the reset structure is installed in a cavity formed between the