Pressurized pump detecting and sealing device suitable for rod type oil well pump

Abstract

The under-pressure pump detecting and sealing device comprises a body, an upper sealing and sealing assembly, a sealing cylinder and a lower sealing and sealing assembly are sequentially arranged in the body from top to bottom, and the interiors of the upper sealing and sealing assembly, the sealing cylinder and the lower sealing and sealing assembly are sequentially communicated. The upper plugging assembly and the lower plugging assembly can plug the interior of the body in a natural state and can open the interior of the body under the action of external force. The device is reasonable and compact in structure, convenient to use, low in cost, high in time efficiency and wide in application range, effectively prevents high-pressure oil-gas flow from being sprayed out through an oil pipe during pump descending, avoids well killing during pump inspection, reduces well control risks possibly generated in operation under pressure, improves operation procedures of pump descending and pump inspection under pressure, and is low in cost, high in time efficiency and wide in application range.

Description

Technical Field

[0001] This utility model belongs to the technical field of oilfield downhole rod pump inspection tools, and particularly relates to a pressurized pump inspection and sealing device suitable for rod-type oil pumps. Background Technology

[0002] During well workover operations involving the running-in and running of pumps and completion tubing, well control is typically required. This involves replacing the working fluid in the wellbore with a higher-density kill fluid, ensuring the bottomhole fluid column pressure exceeds the formation pore pressure. This achieves a pressure-free wellhead and prevents formation fluids from entering the wellbore. Currently, pump inspection operations require well control before any workover, followed by the running of completion tubing and sucker rods. After a period of production, if pump inspection is needed again, well control must be repeated, and the sucker rods and tubing must be retrieved from the wellhead. Existing processes significantly reduce operational time, are cumbersome, and the injection of large amounts of kill fluid increases formation contamination and reduces oil recovery. Utility Model Content

[0003] The purpose of this invention is to provide a pressure-controlled pump sealing device suitable for rod-type oil pumps, so as to solve the technical problems mentioned in the background art.

[0004] To achieve the above objectives, the specific technical solution of this utility model is as follows: A pressure-controlled pump sealing device suitable for rod-type oil pumps includes a body. The body is provided with an upper sealing component, a sealing cylinder, and a lower sealing component from top to bottom. The interiors of the upper sealing component, the sealing cylinder, and the lower sealing component are connected in sequence. The upper sealing component and the lower sealing component can seal the interior of the body in a natural state, and can open the interior of the body under the action of external force.

[0005] Preferably, the inner wall of the sealing cylinder is provided with a first annular groove, and a first sealing ring is embedded in the first annular groove.

[0006] Preferably, the body includes an upper connector and a lower connector, wherein the lower end of the upper connector is connected to the upper end of the lower connector.

[0007] Preferably, the upper sealing assembly includes an upper valve seat, an upper mounting cylinder, an upper valve plate, and an upper torsion spring. The upper valve seat is embedded in the body, the upper end of the upper mounting cylinder is connected to the lower end of the upper valve seat, the side wall of the upper mounting cylinder has an upper notch, the upper valve plate is mounted on the upper mounting cylinder by the upper torsion spring, the upper valve plate blocks the lower opening of the upper valve seat by the upper torsion spring, and thus blocks the interior of the body, and the upper valve plate is retracted into the upper notch under the action of external force.

[0008] Preferably, the upper end of the upper mounting cylinder is sleeved on the lower end of the upper valve seat, and a second annular groove is formed on the lower end surface of the upper valve seat. An upper sealing packing is embedded in the second annular groove. When the lower end opening of the upper valve seat is blocked, the upper valve plate abuts against the upper sealing packing.

[0009] Preferably, the lower end of the upper valve seat is annularly wavy, and the shape of the upper surface of the upper valve plate is adapted to the shape of the lower end of the upper valve seat.

[0010] Preferably, the outer side wall of the upper valve seat is provided with a third annular groove, and an upper sealing ring is embedded in the third annular groove.

[0011] Preferably, the lower sealing assembly includes a lower valve seat, a lower mounting cylinder, a lower valve plate, and a lower torsion spring. The lower valve seat is embedded in the body. The upper end of the lower mounting cylinder is connected to the lower end of the lower valve seat. A lower notch is provided on the side wall of the lower mounting cylinder. The lower valve plate is mounted on the lower mounting cylinder through the lower torsion spring. The lower valve plate blocks the lower opening of the lower valve seat through the lower torsion spring, thereby blocking the interior of the body. The lower valve plate is retracted into the lower notch under the action of external force.

[0012] Preferably, the outer wall of the lower valve seat is provided with a fourth annular groove, and a lower sealing ring is embedded in the fourth annular groove.

[0013] Preferably, the upper end of the lower mounting cylinder is sleeved on the lower end of the lower valve seat, and a fifth annular groove is formed on the lower end surface of the lower valve seat. A lower sealing packing is embedded in the fifth annular groove. When the lower end opening of the lower valve seat is blocked, the lower valve plate abuts against the lower sealing packing.

[0014] The pressure-activated pump sealing device for rod-type oil pumps according to this utility model has the following advantages:

[0015] This invention solves the technical problem in the prior art that the pump sealer can only be opened once when the rod-type oil pump is run under pressure, and cannot be opened and closed at any time on the ground according to the construction process requirements. It has a reasonable and compact structure, is easy to use, effectively prevents high-pressure oil and gas from spraying out through the oil pipe when the pump is run, avoids well killing during pump inspection, reduces well control risks that may occur during pressurized operations, improves the operation procedures for running and inspecting pumps under pressure, and is inexpensive, efficient, and widely applicable. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a cross-sectional structural diagram of the adapter of this utility model when it is inserted into the sealing pump.

[0018] Figure 2This is a cross-sectional structural diagram of the pump sealing device of this utility model in its natural state;

[0019] Figure 3 This is a schematic diagram of the pump sealing device of this utility model after the main body has been removed;

[0020] Figure 4 This is an exploded structural diagram of the pump sealing device of this utility model;

[0021] Figure 5 This is a cross-sectional structural diagram of the sealing cylinder of this utility model;

[0022] Figure 6 This is a schematic diagram of the adapter's structure;

[0023] Figure 7 This is a schematic diagram of the upper valve seat of this utility model;

[0024] Figure 8 This is a schematic diagram of the upper valve plate of this utility model;

[0025] Figure 9 This is a schematic diagram of the lower valve plate of this utility model.

[0026] Explanation of markings in the diagram: 1. Body; 11. Upper connector; 12. Lower connector; 2. Upper sealing assembly; 21. Upper valve seat; 211. Second annular groove; 212. Third annular groove; 22. Upper mounting cylinder; 221. Upper notch; 23. Upper valve plate; 24. Upper torsion spring; 25. Upper sealing packing; 26. Upper sealing ring; 3. Sealing cylinder; 31. First annular groove; 32. Inclined surface; 4. Lower sealing assembly; 41. Lower valve seat; 411. Fourth annular groove; 412. Fifth annular groove; 42. Lower mounting cylinder; 421. Lower notch; 43. Lower valve plate; 44. Lower torsion spring; 45. Lower sealing packing; 46. Lower sealing ring; 5. First sealing ring; 6. Adapter; 61. Contact surface. Detailed Implementation

[0027] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0028] In the description of the embodiments of this utility model, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of 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 the embodiments of this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," 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, an electrical connection, or a communication 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 embodiment of the invention according to the specific circumstances.

[0031] The following disclosure provides many different implementations or examples for different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0032] To better understand the purpose, structure, and function of this utility model, the following description, in conjunction with the accompanying drawings, provides a more detailed account of a pressure-controlled pump sealing device suitable for rod-type oil pumps.

[0033] Please see Figure 1A pressure-operated pump sealing device for rod-type oil pumps includes a body 1, an upper sealing assembly 2, a sealing cylinder 3, and a lower sealing assembly 4. The body 1 is a hollow tubular structure with openings at both ends. Both the upper and lower ends of the body 1 are threaded for connecting other tubing or tools. The upper sealing assembly 2, sealing cylinder 3, and lower sealing assembly 4 are sequentially arranged inside the body 1 from top to bottom, and their interiors are interconnected. Under natural conditions (without external interference), the upper sealing assembly 2 and lower sealing assembly 4 can seal the interior of the body 1 (i.e., isolate the interior of the body 1), achieving a seal; under external force, the upper sealing assembly 2 and lower sealing assembly 4 can open the interior of the body 1 (i.e., achieve internal connectivity within the body 1). When the lower part of the sucker rod is connected to the special insertion sealing adapter 6 and enters the well, the adapter 6 reaches the pump sealing position. When it descends, it first contacts the upper sealing assembly 2 and applies a downward force to the upper sealing assembly 2, thereby opening the upper sealing assembly 2. Then it continues to descend, passes through the sealing cylinder 3 and contacts the lower sealing assembly 4. Similarly, it applies a downward force to the lower sealing assembly 4, thereby opening the lower sealing assembly 4. The adapter 6 penetrates the sealing cylinder 3 and achieves contact sealing with the inside of the sealing cylinder 3.

[0034] This technical solution includes an upper sealing assembly 2 and a lower sealing assembly 4 within the main body 1. When a dedicated insertion sealing adapter 6 is connected to the lower part of the sucker rod and inserted into the well, the adapter 6 enters the pump sealer and opens the upper sealing assembly 2 and the lower sealing assembly 4. When the adapter 6 is pulled out with the sucker rod, the upper sealing assembly 2 and the lower sealing assembly 4 automatically close, achieving a sealing effect. Furthermore, a sealing cylinder 3 is installed inside the main body 1 between the upper sealing assembly 2 and the lower sealing assembly 4, allowing the adapter 6 to contact and seal with the sealing cylinder 3 after insertion into the pump sealer, achieving a better sealing effect. This non-pressure-controlled, switchable pump sealer has a reasonable and compact structure, is easy to use, effectively prevents high-pressure oil and gas flow from spraying out through the tubing during pump running, avoids well control during pump inspection, reduces well control risks that may arise during pressurized operations, improves the operation procedures for running and inspecting pumps under pressure, is inexpensive, efficient, and widely applicable.

[0035] Please see Figures 1 to 2 The main body 1 includes an upper connector 11 and a lower connector 12, with the lower end of the upper connector 11 connected to the upper end of the lower connector 12. Specifically, both the lower and upper ends of the upper connector 11 are threaded, and the upper connector 11 is connected to the lower connector 12 via the threads. By setting the main body 1 as a split structure, the upper connector 11 and the lower connector 12 can be detachably connected, which facilitates the installation of the upper sealing assembly 2, the sealing cylinder 3, and the lower sealing assembly 4 within the main body 1, resulting in a more reasonable and compact structure.

[0036] Please see Figures 4 to 5The sealing cylinder 3 is a cylindrical structure with openings at both the top and bottom and a hollow interior. A first annular groove 31 is formed on the inner wall of the sealing cylinder 3, and a first sealing ring 5 is embedded within the first annular groove 31. When the adapter 6 is inserted into the sealing pump, the adapter 6 opens the upper sealing assembly 2 and the lower sealing assembly 4. Simultaneously, the outer wall of the adapter 6 comes into contact with the inner wall of the sealing cylinder 3. The first sealing ring 5, installed on the inner wall of the sealing cylinder 3, allows the first sealing ring 5 to press against the outer wall of the adapter 6, resulting in a better sealing effect between the adapter 6 and the sealing cylinder 3.

[0037] Please see Figures 5 to 6 The inner wall of the sealing cylinder 3 is not of uniform diameter; it has a stepped structure to achieve segmentation within the sealing cylinder 3. Specifically, the inner wall of the sealing cylinder 3 has an inclined surface 32 extending from top to bottom and from the outside to the inside. The inner diameter of the sealing cylinder 3 above the inclined surface 32 is larger than the inner diameter of the sealing cylinder 3 below the inclined surface 32. Correspondingly, the outer wall of the adapter 6 also has a contact surface 61 corresponding to the inclined surface 32. After the adapter 6 is inserted into the sealing pump, the inclined surface 32 abuts against the contact surface 61, achieving limiting and positioning while also improving the sealing effect between the adapter 6 and the sealing cylinder 3.

[0038] Please see Figure 3 The upper sealing component 2 and the lower sealing component 4 have the same structure, making the structure of the pump sealer more reasonable and compact, which is convenient for mass production.

[0039] Please see Figures 2 to 4 The upper sealing assembly 2 includes an upper valve seat 21, an upper mounting cylinder 22, an upper valve plate 23, and an upper torsion spring 24. Both the upper valve seat 21 and the upper mounting cylinder 22 are embedded within the body 1, and both are open at both ends and hollow internally. The upper end of the upper mounting cylinder 22 is connected to the lower end of the upper valve seat 21 via threads. The lower end of the upper valve seat 21 is connected to the upper end of the sealing cylinder 3 via threads. An upper notch 221 is provided on the side wall of the upper mounting cylinder 22, and the area of ​​the upper notch 221 is larger than the area of ​​the upper valve plate 23. The upper end of the upper valve plate 23 is mounted on the upper mounting cylinder 22 via the upper torsion spring 24. Under the action of the upper torsion spring 24, the upper valve plate 23 blocks the lower opening of the upper valve seat 21, thereby sealing the interior of the body 1 and isolating the interior. Under the action of external force, the upper valve plate 23 is retracted into the upper notch 221 to open the lower opening of the upper valve seat 21 and thus open the interior of the body 1, making the interior connected. The structure of the upper sealing assembly 2 is set in this way so that the upper valve plate 23 can automatically block the lower opening of the upper valve seat 21 by utilizing the elasticity of the upper torsion spring 24, thereby achieving a seal. In addition, through the structural design of the upper mounting cylinder 22, the upper valve plate 23 can be retracted into the upper notch 221 under the action of the adapter 6, thereby making the adapter 6, the upper valve seat 21, and the upper mounting cylinder 22 structurally compact.

[0040] Please see Figure 4 and Figure 7 The outer wall of the upper valve seat 21 has a third annular groove 212, and an upper sealing ring 26 is embedded in the third annular groove 212. The upper sealing ring 26 is made of rubber material with elastic deformation capability. The upper valve seat 21 is embedded in the body 1. By fitting the upper sealing ring 26 on the upper valve seat 21, the inner wall of the body 1 compresses the upper sealing ring 26, thereby making the upper valve seat 21 fit tightly with the body 1, and the structure is more stable.

[0041] Please see Figure 4 and Figure 7 The upper end of the upper mounting cylinder 22 is fitted onto the lower end of the upper valve seat 21. A second annular groove 211 is formed on the lower end surface of the upper valve seat 21, and an upper sealing packing 25 is embedded in the second annular groove 211. When the lower end opening of the upper valve seat 21 is blocked, the upper valve plate 23 abuts against the upper sealing packing 25. The upper sealing packing 25 is made of rubber material with elastic deformation capability. Under the action of the upper torsion spring 24, the upper valve plate 23 abuts against the lower end of the upper valve seat 21 to seal the lower end opening of the upper valve seat 21. By setting the upper sealing packing 25 on the lower end surface of the upper valve seat 21, the upper valve plate 23 and the upper sealing packing 25 are tightly fitted, thereby improving the sealing effect of the upper valve plate 23 when blocking the upper valve seat 21.

[0042] Please see Figure 7 and Figure 8 The lower end of the upper valve seat 21 is annularly wavy, and the shape of the upper end face of the upper valve plate 23 is adapted to the shape of the lower end of the upper valve seat 21. By designing the structure of the lower end face of the upper valve seat 21 and the upper end face of the upper valve plate 23 as annularly wavy, the tightness of the fit between the upper valve plate 23 and the lower end face of the upper valve seat 21 can be greatly improved, thereby improving the sealing effect.

[0043] Please see Figures 2 to 4The lower sealing assembly 4 includes a lower valve seat 41, a lower mounting cylinder 42, a lower valve plate 43, and a lower torsion spring 44. Both the lower valve seat 41 and the lower mounting cylinder 42 are embedded within the body 1, and both are open at both ends and hollow internally. The upper end of the lower valve seat 41 is connected to the lower end of the sealing cylinder 3, and the upper end of the lower mounting cylinder 42 is connected to the lower end of the lower valve seat 41. Connections between the sealing cylinder 3, the lower valve seat 41, and the lower mounting cylinder 42 can all be achieved via threads. The side wall of the lower mounting cylinder 42 has a lower notch 421, the area of ​​which is larger than the area of ​​the lower valve plate 43. The lower valve seat 41 is mounted on the lower mounting cylinder 42 via a lower torsion spring 44. Under the action of the lower torsion spring 44, the lower valve plate 43 seals the lower opening of the lower valve seat 41 to block the interior of the body 1, thus isolating the interior. Under the action of external force, the lower valve plate 43 is retracted into the lower notch 421 to open the lower opening of the lower valve seat 41 and thus open the interior of the body 1, making the interior connected. The structure of the lower sealing assembly 4 is configured in this way so that the lower valve plate 43 can automatically seal the lower opening of the lower valve seat 41 using the elastic force of the lower torsion spring 44, thus achieving a seal. In addition, through the structural design of the lower mounting cylinder 42, the lower valve plate 43 can be retracted into the lower notch 421 under the action of the adapter 6, thus making the adapter 6, the lower valve seat 41, and the lower mounting cylinder 42 structurally compact.

[0044] Please see Figure 4 and Figure 9 The lower valve seat 41 has a fourth annular groove 411 on its outer side wall, and a lower sealing ring 46 is embedded in the fourth annular groove 411. The lower sealing ring 46 is made of rubber material with elastic deformation capability. The lower valve seat 41 is embedded in the body 1. By fitting the lower sealing ring 46 on the lower valve seat 41, the inner side wall of the body 1 compresses the lower sealing ring 46, thereby making the lower valve seat 41 fit tightly with the body 1, and the structure is more stable.

[0045] Please see Figure 4 and Figure 9 The upper end of the lower mounting cylinder 42 is fitted onto the lower end of the lower valve seat 41. A fifth annular groove 412 is formed on the lower end surface of the lower valve seat 41, and a lower sealing packing 45 is embedded in the fifth annular groove 412. When the lower end opening of the lower valve seat 41 is blocked, the lower valve plate 43 abuts against the lower sealing packing 45. The lower sealing packing 45 is made of rubber material with elastic deformation capability. Under the action of the lower torsion spring 44, the lower valve plate 43 abuts against the lower end of the lower valve seat 41 to seal the lower end opening of the lower valve seat 41. By setting the lower sealing packing 45 on the lower end surface of the lower valve seat 41, the lower valve plate 43 and the lower sealing packing 45 are tightly fitted, thereby improving the sealing effect of the lower valve plate 43 when blocking the lower valve seat 41.

[0046] Please see Figure 9The lower end of the lower valve seat 41 is annularly wavy, and the shape of the upper end face of the lower valve plate 43 is adapted to the shape of the lower end of the lower valve seat 41. By designing the structure of the lower end face of the lower valve seat 41 and the structure of the upper end face of the lower valve plate 43 as annularly wavy, the tightness of the fit between the lower valve plate 43 and the lower end face of the lower valve seat 41 can be greatly improved, thereby improving the sealing effect.

[0047] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A pressure-activated pump sealer suitable for rod-type oil pumps, characterized in that: The body (1) includes an upper sealing component (2), a sealing cylinder (3) and a lower sealing component (4) arranged sequentially from top to bottom. The interiors of the upper sealing component (2), the sealing cylinder (3) and the lower sealing component (4) are connected sequentially. The upper sealing component (2) and the lower sealing component (4) can seal the interior of the body (1) in a natural state, and can open the interior of the body (1) under the action of external force.

2. The pressure-activated pump sealing device for rod-type oil pumps according to claim 1, characterized in that: The inner wall of the sealing cylinder (3) is provided with a first annular groove (31), and a first sealing ring (5) is embedded in the first annular groove (31).

3. A pressure-activated pump sealing device for rod-type oil pumps according to claim 1, characterized in that: The body (1) includes an upper connector (11) and a lower connector (12), with the lower end of the upper connector (11) connected to the upper end of the lower connector (12).

4. A pressure-activated pump sealing device for rod-type oil pumps according to claim 1, characterized in that: The upper sealing assembly (2) includes an upper valve seat (21), an upper mounting cylinder (22), an upper valve plate (23), and an upper torsion spring (24). The upper valve seat (21) is embedded in the body (1). The upper end of the upper mounting cylinder (22) is connected to the lower end of the upper valve seat (21). The side wall of the upper mounting cylinder (22) has an upper notch (221). The upper valve plate (23) is mounted on the upper mounting cylinder (22) through the upper torsion spring (24). The upper valve plate (23) blocks the lower opening of the upper valve seat (21) through the upper torsion spring (24), thereby blocking the interior of the body (1). The upper valve plate (23) is retracted into the upper notch (221) under the action of external force.

5. A pressure-activated pump sealing device for rod-type oil pumps according to claim 4, characterized in that: The upper end of the upper mounting cylinder (22) is sleeved on the lower end of the upper valve seat (21). A second annular groove (211) is opened on the lower end surface of the upper valve seat (21). An upper sealing packing (25) is embedded in the second annular groove (211). When the lower end opening of the upper valve seat (21) is blocked, the upper valve plate (23) abuts against the upper sealing packing (25).

6. A pressure-activated pump sealing device for rod-type oil pumps according to claim 4, characterized in that: The lower end of the upper valve seat (21) is annularly wavy, and the shape of the upper surface of the upper valve plate (23) is adapted to the shape of the lower end of the upper valve seat (21).

7. A pressure-activated pump sealing device for rod-type oil pumps according to claim 4, characterized in that: The outer wall of the upper valve seat (21) is provided with a third annular groove (212), and an upper sealing ring (26) is embedded in the third annular groove (212).

8. A pressure-activated pump sealing device for rod-type oil pumps according to claim 1, characterized in that: The lower sealing assembly (4) includes a lower valve seat (41), a lower mounting cylinder (42), a lower valve plate (43), and a lower torsion spring (44). The lower valve seat (41) is embedded in the body (1). The upper end of the lower mounting cylinder (42) is connected to the lower end of the lower valve seat (41). The side wall of the lower mounting cylinder (42) has a lower notch (421). The lower valve plate (43) is mounted on the lower mounting cylinder (42) through the lower torsion spring (44). The lower valve plate (43) blocks the lower opening of the lower valve seat (41) through the lower torsion spring (44), thereby blocking the interior of the body (1). The lower valve plate (43) is retracted into the lower notch (421) under the action of external force.

9. A pressure-activated pump sealing device for rod-type oil pumps according to claim 8, characterized in that: The outer wall of the lower valve seat (41) is provided with a fourth annular groove (411), and a lower sealing ring (46) is embedded in the fourth annular groove (411).

10. A pressure-activated pump sealing device for rod-type oil pumps according to claim 8, characterized in that: The upper end of the lower mounting cylinder (42) is sleeved on the lower end of the lower valve seat (41). A fifth annular groove (412) is opened on the lower end surface of the lower valve seat (41). A lower sealing packing (45) is embedded in the fifth annular groove (412). When the lower end opening of the lower valve seat (41) is blocked, the lower valve plate (43) abuts against the lower sealing packing (45).

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