Floating valve plate

Abstract

The utility model discloses a floating valve plate which comprises a valve plate support and a step groove formed between the valve plates, and a sliding hole communicated with the step groove is formed in the valve plate support. A round valve plate is installed in the step groove in a floating mode, a sliding part in sliding fit with the sliding hole is arranged on the round valve plate, and a limiting ring groove and an elastic clamping ring arranged on the limiting ring groove in a sleeving mode are arranged on the portion, stretching out of the valve plate support, of the sliding part. An elastic compression spring abutting against the round valve plate is arranged in the step groove. The problem that an existing valve plate is of a rigid structure and cannot be completely sealed due to vibration in the long-term opening and closing matching process with a valve plate seat is solved.

Description

Technical Field

[0001] This utility model relates to the field of downhole safety valve technology, and in particular to a floating valve plate. Background Technology

[0002] A downhole safety valve is a safety device controlled by a control line extending from the downhole safety valve to the surface wellhead, enabling the valve to open or close. When the hydraulic pump pressurizes the hydraulic chamber to the safety valve's opening pressure via the control line interface, a piston designed on the safety valve pushes the internal flow tube against the force of a power spring, opening the valve plate. When this pressure is maintained, the safety valve is in the normally open state. When pressure is lost in the control line, the flow tube is pushed back by a power return spring inside the safety valve, and the valve plate returns to the closed state under the action of the valve plate return spring, thus closing the safety valve. Downhole safety valves are indispensable tools for well completion, testing, and other downhole operations. The purpose of installing surface-controlled downhole safety valves is to control and shut off fluid flow in the well when catastrophic events occur at the wellhead, such as wellhead overpressure or fire, and surface wellhead control fails. When such emergencies occur, we can use a surface-controlled downhole safety valve to stop the flow of fluid in the well and protect the last line of defense on the surface, including the wellhead. It is a safety device that prevents downhole dangers from spilling onto the surface.

[0003] Safety valves typically require continuous hydraulic pressure to remain fully open. This hydraulic pressure is achieved through hydraulic lines installed outside the tubing. When the hydraulic control line loses hydraulic pressure, the downhole safety valve will close, and the flow passage inside the tubing will be sealed by the valve plate and valve seat.

[0004] The existing valve plate is a one-piece rigid structure. The seal relies on the valve plate seat and the valve plate sealing surface to achieve a metal seal. During long-term opening and closing, the valve plate vibration may cause the valve plate to not be able to fully fit tightly with the valve plate seat after returning to its original position, thus causing the risk of poor sealing and leakage. Utility Model Content

[0005] The purpose of this utility model is to provide a floating valve plate to solve the problem that existing valve plates are rigid structures and cannot be completely sealed due to vibration during long-term opening and closing cooperation with the valve plate seat.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A floating valve plate includes a valve plate support and a stepped groove disposed between the valve plates. The valve plate support has a sliding hole communicating with the stepped groove. A circular valve plate is floatingly installed in the stepped groove. The circular valve plate has a sliding part that slides with the sliding hole. The portion of the sliding part that extends out of the valve plate support has a limiting ring groove and an elastic retaining ring sleeved on the limiting ring groove. An elastic compression spring is provided in the stepped groove to abut against the circular valve plate.

[0008] Preferably, the valve plate support is provided with an outwardly extending rotating ear, and the rotating ear is provided with a rotating hole.

[0009] Preferably, the stepped groove includes a first limiting step, a first conical step, and a second limiting step, all with diameters decreasing sequentially.

[0010] Preferably, the circular valve plate is provided with a first limiting part that fits against the first limiting step, and a second limiting part that fits against the first conical step, and the elastic compression spring is provided on the second limiting step and abuts against the second limiting part.

[0011] Preferably, the circular valve plate is provided with a conical surface structure extending to the first limiting portion.

[0012] Preferably, the elastic compression spring includes an annular spring sheet, on which a first curved portion and a second curved portion are arranged circumferentially, the first curved portion and the second curved portion having opposite bending directions, and adjacent first curved portions and second curved portions being connected in sequence.

[0013] Preferably, the elastic compression spring is an integrally stamped structure.

[0014] Preferably, the back of the valve plate bracket is provided with an inclined slope structure.

[0015] Preferably, the valve plate support is an integrally formed structure.

[0016] Beneficial effects:

[0017] A stepped groove is provided on the valve plate bracket to float the circular valve plate. The sliding part of the circular valve plate passes through the sliding hole and is limited by an elastic retaining ring. This allows the circular valve plate to float within a certain range relative to the valve plate bracket without detaching. At the same time, an elastic compression spring is set in the stepped groove to abut against the circular valve plate. The return elasticity pushes the circular valve plate to return to its original position. When the circular valve plate is subjected to external force, the elastic compression spring buffers the impact, thereby avoiding the risk of deformation caused by hard contact between the circular valve plate and the valve plate seat. Furthermore, the combination of floating and elasticity allows the circular valve plate to automatically align with the valve plate seat during sealing, ensuring a tight seal.

[0018] Furthermore, the circular valve plate has a floating effect, allowing it to float without deformation when subjected to external vibration forces. Attached Figure Description

[0019] Figure 1 This is a first-view perspective three-dimensional structural diagram of an embodiment of the present utility model;

[0020] Figure 2 This is a second-view perspective three-dimensional structural diagram of an embodiment of the present utility model;

[0021] Figure 3 This is a cross-sectional structural diagram of an embodiment of the present utility model;

[0022] Figure 4 This is a cross-sectional view of the valve plate bracket in an embodiment of the present utility model;

[0023] Figure 5 This is a schematic diagram of the circular valve plate in an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the elastic compression spring in an embodiment of the present invention;

[0025] exist Figures 1 to 6 In the diagram, the correspondence between component names or lines and the drawing numbers is as follows:

[0026] Valve plate bracket 1, stepped groove 2, sliding hole 3, circular valve plate 4, sliding part 5, limiting ring groove 6, elastic retaining ring 7, elastic compression spring 8, rotating ear 9, rotating hole 10, first limiting step 11, first conical step 12, second limiting step 13, first limiting part 14, second limiting part 15, conical structure 16, first curved part 17, second curved part 18, inclined surface structure 19. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] See Figures 1-6As shown in the embodiment of this utility model, a floating valve plate is proposed for installation in a safety valve, which cooperates with the valve plate seat to achieve sealing. Specifically, the floating valve plate includes a valve plate support 1 and a stepped groove 2 located between the valve plates. The valve plate support 1 has a sliding hole 3 communicating with the stepped groove 2. A circular valve plate 4 is floatingly installed in the stepped groove 2. The circular valve plate 4 has a sliding part 5 that slides with the sliding hole 3. The part of the sliding part 5 that extends out of the valve plate support 1 has a limiting ring groove 6 and an elastic retaining ring 7 fitted on the limiting ring groove 6. The sliding part 5 slides relative to the sliding hole 3, so that the circular valve plate 4 can have a certain floating space relative to the stepped groove 2. After the elastic retaining ring 7 is engaged with the limiting ring groove 6, the circular valve plate 4 will not detach from the valve plate support 1. At the same time, an elastic compression spring 8 is provided in the stepped groove 2 that abuts against the circular valve plate 4. The elastic action of the elastic compression spring 8 pushes the circular valve plate 4 to protrude away from the stepped groove 2. In this state, it cooperates with the valve plate seat to achieve a sealing fit. During the actual closing process, the floating of the circular valve plate 4 relative to the stepped groove 2 can automatically match the hole position on the valve plate seat, forming an automatic alignment process. When the circular valve plate 4 is subjected to external force, it can be buffered by the elastic compression spring 8, thereby avoiding the deformation of the circular valve plate 4 due to direct force, and ensuring that it can maintain a good sealing state after long-term opening and closing.

[0029] Specifically, the valve plate bracket 1 is provided with an outwardly extending rotating ear 9, and the rotating ear 9 is provided with a rotating hole 10. The rotating pin is installed on the valve plate seat through the rotating hole 10, thereby realizing the rotatable connection between the valve plate bracket 1 and the valve plate seat.

[0030] Specifically, the stepped groove 2 includes a first limiting step 11, a first conical step 12, and a second limiting step 13 with successively decreasing diameters, which respectively support the circular valve plate 4. The circular valve plate 4 is provided with a first limiting part 14 that fits with the first limiting step 11 and a second limiting part 15 that fits with the first conical step 12. The elastic compression spring 8 is provided on the second limiting step 13 and abuts against the second limiting part 15. The first limiting part 14 and the first limiting step 11 cooperate to position the part of the circular valve plate 4 that mainly functions as a seal. The first conical step 12 is used to keep the second limiting part 15 in contact with the valve plate support 1 when it floats. The third limiting step limits the placement of the elastic compression spring 8.

[0031] Meanwhile, in order to achieve a seal with the valve plate seat, a conical structure 16 extending to the first limiting part 14 is provided on the circular valve plate 4, and the conical structure 16 is used to facilitate automatic alignment in the initial stage of engagement.

[0032] Specifically, the elastic compression spring 8 supports and pushes the circular valve plate 4, while also buffering pressure and deforming and recovering within a small space. Specifically, the elastic compression spring 8 includes an annular spring sheet with a first curved portion 17 and a second curved portion 18 arranged circumferentially. The first curved portion 17 and the second curved portion 18 have opposite bending directions, and adjacent first curved portions 17 and second curved portions 18 are connected sequentially. By forming multiple continuous first curved portions 17 and second curved portions 18 with opposite bending directions on an integral annular spring sheet, the support and force buffering of the circular valve plate 4 are achieved by utilizing the method that the first curved portions 17 and second curved portions 18 flatten under pressure and recover their bending after being unpressurized.

[0033] To ensure the elasticity and recovery performance of the elastic spring 8, the elastic spring 8 is made into a one-piece stamped structure.

[0034] Specifically, an inclined slope structure 19 is provided on the back of the valve plate support 1. This reduces material usage while ensuring the structural strength of the valve plate support 1, and also reduces the space required for rotation, making it suitable for rotational movements within downhole pipelines. Furthermore, to ensure the structural stability of the valve plate support 1, it is also a one-piece molded structure.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A floating valve plate, characterized in that: It includes a valve plate bracket (1) and a stepped groove (2) disposed between the valve plates, wherein a sliding hole (3) communicating with the stepped groove (2) is provided on the valve plate bracket (1); A circular valve plate (4) is floatingly installed in the stepped groove (2). The circular valve plate (4) is provided with a sliding part (5) that slides with the sliding hole (3). The part of the sliding part (5) that extends out of the valve plate bracket (1) is provided with a limiting ring groove (6) and an elastic retaining ring (7) sleeved on the limiting ring groove (6). The stepped groove (2) is provided with an elastic compression spring (8) that abuts against the circular valve plate (4).

2. A floating valve plate according to claim 1, characterized in that: The valve plate bracket (1) is provided with an outwardly extending rotating ear (9), and the rotating ear (9) is provided with a rotating hole (10).

3. A floating valve plate according to claim 2, characterized in that: The stepped groove (2) includes a first limiting step (11) with a diameter decreasing sequentially, a first conical step (12) and a second limiting step (13).

4. A floating valve plate according to claim 3, characterized in that: The circular valve plate (4) is provided with a first limiting part (14) that fits against the first limiting step (11) and a second limiting part (15) that fits against the first conical step (12). The elastic compression spring (8) is provided on the second limiting step (13) and abuts against the second limiting part (15).

5. A floating valve plate according to claim 4, characterized in that: The circular valve plate (4) is provided with a conical structure (16) extending to the first limiting part (14).

6. A floating valve plate according to claim 5, characterized in that: The elastic compression spring (8) includes an annular spring sheet, on which a first curved portion (17) and a second curved portion (18) are arranged circumferentially. The first curved portion (17) and the second curved portion (18) have opposite bending directions, and adjacent first curved portions (17) and second curved portions (18) are connected in sequence.

7. A floating valve plate according to claim 6, characterized in that: The elastic compression spring (8) is an integral stamped structure.

8. A floating valve plate according to any one of claims 1-7, characterized in that: The valve plate support (1) has an inclined slope structure (19) on its back side.

9. A floating valve plate according to claim 8, characterized in that: The valve plate bracket (1) is an integrally formed structure.

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