Ball valve limiting mechanism of RD pressure test valve

Abstract

The utility model discloses a ball valve limiting mechanism of an RD pressure test valve, which comprises a ball cage, a ball valve arranged in an inner hole of the ball cage, a spherical pit arranged on the surface of the ball valve, a compression screw arranged on the side wall of the ball cage, a spring arranged in an inner hole of the compression screw, one end of the spring connected with the compression screw, and the other end of the spring connected with a steel ball. The steel ball is used for being matched with the spherical pit to limit the ball valve. The steel ball is arranged on the ball cage, and the spherical pit is formed in the ball valve, so that the ball valve can be locked at the opening position after being opened, and the inner hole of the ball body is kept concentric with the inner hole of the tool body, and the problem that the inner hole of the ball body is not concentric with the inner hole of the tool body after the ball valve of the RD pressure test valve is opened in the prior art is solved. The inner hole of the ball valve and the sealing surface of the ball seat are eroded, and the service life of the ball valve is further influenced.

Description

Technical Field

[0001] The utility model belongs to the technical field of petroleum downhole testing equipment, and in particular relates to a ball valve limiting mechanism of an RD pressure test valve. Background Art

[0002] RD pressure test valve is a ball valve opening tool used for downhole testing operations. After the ball valve is opened, the tool needs to maintain full bore. Since there are designed gaps between the ball valve and the operating pin, between the operating pin and the connecting claw, and between the connecting claw and the outer tube of the rupture disk, these gaps can reduce the inertia and impact force during the opening of the ball valve and avoid damage to the ball valve and the operating pin. At the same time, these gaps will also affect the opening position of the ball valve, causing the inner hole of the ball valve to be out of center with the inner hole of the tool body, resulting in erosion of the inner hole of the ball valve and the sealing surface of the ball seat during downhole operations, affecting the service life of the ball valve. Utility Model Content

[0003] The utility model aims to provide a ball valve limit mechanism for an RD pressure test valve, which solves the technical problem in the prior art that after the RD pressure test valve ball valve is opened, the inner hole of the ball is not concentric with the inner hole of the tool body, resulting in erosion of the inner hole of the ball valve and the sealing surface of the ball seat, further affecting the service life of the ball valve.

[0004] The technical solution adopted by the utility model is that the ball valve limiting mechanism of the RD pressure test valve comprises a ball cage, a ball valve is installed in the inner hole of the ball cage, a spherical pit is provided on the surface of the ball valve, a clamping screw is installed on the side wall of the ball cage, a spring is installed in the inner hole of the clamping screw, one end of the spring is connected to the clamping screw, and the other end of the spring is connected to a steel ball, and the steel ball is used to cooperate with the spherical pit to limit the ball valve.

[0005] The utility model is also characterized in that:

[0006] The side wall of the ball valve is provided with a mounting platform b, and the spherical pit is located on the mounting platform b; the inner wall of the ball cage is provided with a mounting platform a, and the clamping screw, steel ball and spring are arranged in the mounting platform a, and the mounting platform b is parallel to the mounting platform a.

[0007] A blind hole is arranged on the side wall of the ball cage from outside to inside, and the blind hole passes through the mounting platform a.

[0008] The clamping screw, the steel ball, the spring, the mounting platform a and the mounting platform b are all symmetrically arranged with the axis of the ball valve as the symmetry axis.

[0009] Two spherical pits are symmetrically arranged on the mounting platform b, and both cooperate with the spherical pits to limit the ball valve during the rotation of the ball valve.

[0010] The beneficial effects of the utility model are:

[0011] 1. The utility model arranges a steel ball on the ball cage and a spherical pit on the ball valve, so that the ball valve can be locked in the open position after opening, and the inner hole of the ball is kept concentric with the inner hole of the tool body, thereby solving the technical problem in the prior art that the inner hole of the ball and the sealing surface of the ball seat of the RD pressure test valve are eroded after the ball valve is opened, further affecting the service life of the ball valve.

[0012] 2. The utility model does not change the main structure of the RD pressure test valve, only the ball valve and the ball cage need to be replaced, and the interchangeability of other parts is not affected; the utility model only processes the non-sealing surface of the ball, and the processing amount is small, which does not affect the sealing performance and strength of the ball valve; the utility model adopts a spring steel ball structure limit, the friction resistance during the movement of the ball valve is small, and the steel ball structure can be self-positioned, and the positioning accuracy is more accurate. After the ball valve is in place, when the position floats in a small range, the steel ball can move in the spherical pit, and finally it is limited to the center of the spherical surface under the action of the spring force, which can avoid the steel ball from forming a fixed limit instantly after entering the pit, and avoid the problem of squeezing the ball valve and the steel ball due to inertia and impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 yes Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0015] Figure 3 It is a structural schematic diagram of the ball valve in the utility model;

[0016] Figure 4 It is a structural schematic diagram of a ball cage in the utility model.

[0017] In the figure, 1. ball cage, 2. ball valve, 3. clamping screw, 4. steel ball, 5. spring, 6. ball seat short section, 7. mounting platform a, 8. mounting platform b, 9. spherical pit. DETAILED DESCRIPTION

[0018] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0019] Example 1

[0020] like Figure 1-Figure 4As shown, the utility model provides a ball valve limiting mechanism of an RD pressure test valve, comprising a ball cage 1, a ball valve 2 is installed in the inner hole of the ball cage 1, a ball seat short section 6 is threadedly connected to the ball cage 1, and is used to axially limit the ball valve 2 so that the ball valve 2 is limited between the ball cage 1 and the ball seat short section 6, a spherical pit 9 is provided on the surface of the ball valve 2, a clamping screw 3 is installed on the side wall of the ball cage 1, a spring 5 is installed in the inner hole of the clamping screw 3, one end of the spring 5 is connected to the clamping screw 3, and the other end of the spring 5 is connected to a steel ball 4, and the steel ball 4 is used to cooperate with the spherical pit 9 to limit the ball valve 2.

[0021] The utility model arranges a steel ball 4 on the ball cage 1 and a spherical pit 9 on the ball valve 2, so that the ball valve 2 can be locked in the open position after it is opened, and the inner hole of the ball is kept concentric with the inner hole of the tool body, thereby solving the technical problem in the prior art that the inner hole of the ball and the inner hole of the tool body are not concentric after the RD pressure test valve ball valve is opened, resulting in erosion of the inner hole of the ball valve 2 and the sealing surface of the ball seat, further affecting the service life of the ball valve 2; the utility model does not change the main structure of the RD pressure test valve, only needs to replace the ball valve 2 and the ball cage 1, and does not affect the interchangeability of other parts; the utility model only processes the non-sealing surface of the ball, the processing amount is small, and the sealing performance and strength of the ball valve 2 are not affected.

[0022] Example 2

[0023] On the basis of Example 1, a mounting platform b8 is provided on the side wall of the ball valve 2, the surface of the mounting platform b8 is tangent to the side wall of the ball valve 2, and the spherical pit 9 is located on the mounting platform b8; a mounting platform a7 is provided on the inner wall of the ball cage 1, the clamping screw 3, the steel ball 4 and the spring 5 are arranged in the mounting platform a7, the mounting platform b8 is parallel to the mounting platform a7, and the surface of the steel ball 4 is close to the mounting platform b8 on both sides of the ball valve 2.

[0024] A blind hole is opened on the side wall of the ball cage 1 from the outside to the inside, and the blind hole passes through the mounting platform a7. The diameter of the steel ball 4 is smaller than the minor diameter of the blind hole, and the diameter of the clamping screw 3 is between the minor diameter and the major diameter of the blind hole. The diameter of the steel ball 4 is smaller than the minor diameter of the blind hole, and the diameter of the clamping screw 3 is between the minor diameter and the major diameter of the blind hole, so that the steel ball 4 can enter and exit through the blind hole. This arrangement is convenient for disassembly and replacement of the clamping screw 3, steel ball 4 and spring 5, and the clamping screw 3, steel ball 4 and spring 5 can also be taken out when eliminating the limit of the ball valve 2 without disassembling the ball valve 2.

[0025] The clamping screw 3, steel ball 4, spring 5 mounting platform a7 and mounting platform b8 are symmetrically arranged with the axis of the ball valve 2 as the symmetry axis, and the limiting ability is stronger and more accurate. The ball valve 2 is installed between the two side planes of the inner hole of the ball cage 1. During the initial assembly, the steel balls 4 on both sides are close to the mounting platforms b8 on both sides of the ball valve 2.

[0026] Example 3

[0027] On the basis of Example 2, two spherical pits 9 are symmetrically arranged on the mounting table b8, and during the rotation of the ball valve 2, both of them cooperate with the spherical pits 9 to limit the ball valve 2. This structure can make the rotation direction of the ball valve 2 more diverse. For example, if only one spherical pit 9 is set, the ball valve 2 cannot be opened and closed in only one direction. Two spherical pits 9 are symmetrically arranged, and each time the ball valve 2 is opened, there will be a spherical pit 9 cooperating with the steel ball 4 to limit it.

[0028] When the ball valve 2 is opened, as the ball valve 2 rotates along the axis of the mounting platform a7 and the mounting platform b8, the flow channel of the ball valve 2 is coaxial with the inner hole of the ball cage 1, and the spherical pit 9 on the surface of the mounting platform b8 on the ball valve 2 will move to the position of the steel ball 4. Under the pressure of the spring 5, the steel ball 4 will sink into the pit on the surface of the ball valve 2 to prevent the ball valve 2 from changing its position after rebounding, thereby constraining the position of the ball valve 2 and preventing the position of the ball valve 2 from changing.

[0029] The utility model adopts the structure of spring 5 and steel ball 4 for limiting, the friction resistance in the movement process of ball valve 2 is small, and the structure of steel ball 4 can be self-positioned, and the positioning accuracy is more accurate. After the ball valve 2 is in place, when the position floats in a small range, the steel ball 4 can move in the spherical pit 9, and finally is limited to the center position of the spherical surface under the action of the spring 5 force, which can avoid the steel ball 4 from forming a fixed limit instantly after entering the spherical pit 9, and avoid the problem of squeezing the ball valve and the steel ball due to inertia and impact.

Claims

1. The ball valve limit mechanism of the RD pressure test valve is characterized by: The invention comprises a ball cage (1), a ball valve (2) is installed in the inner hole of the ball cage (1), a spherical pit (9) is provided on the surface of the ball valve (2), a clamping screw (3) is installed on the side wall of the ball cage (1), a spring (5) is installed in the inner hole of the clamping screw (3), one end of the spring (5) is connected to the clamping screw (3), and the other end of the spring (5) is connected to a steel ball (4), and the steel ball (4) is used to cooperate with the spherical pit (9) to limit the ball valve (2).

2. The ball valve limiting mechanism of the RD pressure test valve according to claim 1 is characterized in that: The side wall of the ball valve (2) is provided with a mounting platform b (8), and the spherical pit (9) is located on the mounting platform b (8); the inner wall of the ball cage (1) is provided with a mounting platform a (7), and the clamping screw (3), the steel ball (4) and the spring (5) are arranged in the mounting platform a (7), and the mounting platform b (8) is parallel to the mounting platform a (7).

3. The ball valve limiting mechanism of the RD pressure test valve according to claim 2 is characterized in that: The side wall of the ball cage (1) is provided with a blind hole from the outside to the inside, and the blind hole passes through the mounting platform a (7).

4. The ball valve limiting mechanism of the RD pressure test valve according to claim 2 is characterized in that: The clamping screw (3), the steel ball (4), the spring (5), the mounting platform a (7) and the mounting platform b (8) are all symmetrically arranged with the axis of the ball valve (2) as the symmetry axis.

5. The ball valve limiting mechanism of the RD pressure test valve according to claim 2 is characterized in that: The spherical recesses (9) are symmetrically arranged in two on the mounting platform b (8), and both cooperate with the spherical recesses (9) to limit the position of the ball valve (2) during the rotation of the ball valve (2).

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