Automatic pressure relief mechanism
By designing an automatic pressure relief mechanism on the hydraulic accelerator, the pressure change caused by the rise in oil temperature is utilized to achieve automatic pressure relief, which solves the problem of reduced seal performance and metal fatigue caused by high oil pressure and high temperature in the hydraulic accelerator, and extends the service life of the equipment.
Patent Information
- Application Number
- CN202423147702.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-12-19
AI Technical Summary
When the hydraulic accelerator is under long-term load, the oil temperature rises, resulting in a decrease in seal performance, an increase in oil chamber pressure, a decrease in metal thermal deformation fatigue strength, and a shortened service life.
Design an automatic pressure relief mechanism, including a pressure relief hole, a pressure relief groove, a sealing rod, and an oil drain hole. It utilizes the increase in oil volume and oil pressure caused by the rise in oil temperature to automatically relieve high oil pressure, reduce metal thermal deformation fatigue, and extend the life of the hydraulic accelerator.
The automatic pressure relief mechanism effectively alleviates the problems of high oil pressure and high temperature in the hydraulic accelerator, reduces metal thermal deformation fatigue, and extends the service life of the hydraulic accelerator.
Smart Images
Figure CN223483523U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an automatic pressure relief mechanism for a hydraulic accelerator, belonging to the technical field of tools for speeding up and improving efficiency in the oil drilling and production industry. Background Technology
[0002] Hydraulic accelerators are generally used in conjunction with shock absorbers, connected above the shock absorber. They are particularly effective in directional wells, horizontal wells, or shallow wells with limited drill string elongation and high frictional resistance. The hydraulic accelerator accelerates the impact of the shock absorber connected below, thereby obtaining a greater impact force on the stuck point. However, it is always under load and works repeatedly for a long time. The increased oil temperature leads to a decrease in the performance of the seals or failure. The increased oil temperature in the oil chamber also leads to an increase in the oil chamber pressure. At the same time, the thermal deformation fatigue strength of the metal decreases, and the life of the hydraulic accelerator is shortened. Summary of the Invention
[0003] To solve the above-mentioned technical problems, this utility model provides an automatic pressure relief mechanism that automatically reduces the oil pressure in the oil chamber and improves the life of the hydraulic accelerator.
[0004] This utility model provides an automatic pressure relief mechanism, including a pressure relief hole, a pressure relief groove, a sealing rod, and an oil drain hole. The pressure relief groove is connected to an oil chamber through the pressure relief hole, and the oil drain hole is connected to the pressure relief groove. The sealing rod is disposed in the pressure relief groove and has a first position for opening the pressure relief hole and a second position for closing the pressure relief hole. A screw plug rod is threadedly connected to the pressure relief groove. The sealing rod has a connecting groove, and the screw plug rod is inserted into the connecting groove and abuts against the sealing rod through a disc spring.
[0005] The sealing rod has a first oil inlet and a first oil outlet that communicate with the connecting groove, and the first oil outlet communicates with the drain hole.
[0006] The screw plug rod is provided with an oil passage cavity, which also has a second oil inlet and a second oil outlet. When the sealing rod is in the first position, the second oil inlet is connected to the first oil inlet, and the second oil outlet is connected to the first oil outlet.
[0007] The oil drain hole is equipped with a filter plug.
[0008] The pressure relief hole, pressure relief groove, sealing rod, and oil drain hole are located on the side wall of the upper connector. The upper connector is connected to a mandrel, which is also connected in sequence to an upper cylinder liner, a middle cylinder liner, a pressure cap, and a lower connector. An oil cavity is provided between the mandrel and the upper connector, the upper cylinder liner, and the middle cylinder liner. The pressure relief hole of the upper connector is connected to the oil cavity.
[0009] The advantages of this utility model, achieved by adopting the above technical solution, are as follows: After setting a pressure relief mechanism on the hydraulic accelerator, when the hydraulic accelerator has been working for a certain period of time, the oil pressure in the oil chamber is greater than that of the outside. As the oil temperature rises, the oil volume increases, and the oil pressure also rises. When the oil pressure exceeds the design value, the oil rushes into the pressure relief hole and pushes the sealing rod, causing the sealing rod to be in the first position. The high-pressure oil will then enter the pressure relief groove and flow out from the oil drain hole connected to the pressure relief groove. When the pressure relief ends, the oil pressure in the oil chamber recovers, and the sealing rod is in the second position, blocking the pressure relief hole. This design can effectively alleviate the high temperature caused by the high oil pressure of the hydraulic accelerator, reduce the probability of metal thermal deformation fatigue strength reduction, and extend the service life of the hydraulic accelerator. Attached Figure Description
[0010] Figure 1 This is a structural schematic diagram of the present invention installed on a hydraulic accelerator, and a cross-sectional view of the automatic pressure relief mechanism.
[0011] Figure 2 for Figure 1 Cross-sectional view of the automatic pressure relief mechanism along the CC direction;
[0012] In the diagram: 1. Mandrel; 2. Upper connector; 3. Upper cylinder liner; 4. Middle cylinder liner; 5. Pressure cap; 6. Lower connector; 7. Oil chamber; 8. Pressure relief hole; 9. Pressure relief groove; 10. Sealing rod; 11. Oil drain hole; 12. Plug rod; 13. Connecting groove; 14. Disc spring; 15. First oil inlet hole; 16. First oil outlet hole; 17. Oil passage chamber; 18. Second oil inlet hole; 19. Second oil outlet hole; 20. Filter plug. Detailed Implementation
[0013] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.
[0014] The terms "first," "second," etc. (if present) in the specification and claims of this utility model are used to distinguish similar objects, not to describe a specific order or sequence. Even if "second" is used before a technical feature for distinction, it does not necessarily imply the presence of "first." It should be understood that in this utility model, "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. It should be understood that in this utility model, "multiple" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, X and / or Y can represent: X alone, X and Y simultaneously, and Y alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Containing X, Y, and Z," "Containing X, Y, and Z" means that all three X, Y, and Z are included; "Containing X, Y, or Z" means that one of X, Y, and Z is included; "Containing X, Y, and / or Z" means that any one, two, or three of X, Y, and Z are included.
[0015] like Figures 1 to 2 As shown, this utility model provides an automatic pressure relief mechanism, including a pressure relief hole 8, a pressure relief groove 9, a sealing rod 10, and an oil drain hole 11. The pressure relief groove 9 is connected to the oil chamber 7 through the pressure relief hole 8, and the oil drain hole 11 is connected to the pressure relief groove 9. The sealing rod 10 is disposed in the pressure relief groove 9 and has a first position for opening the pressure relief hole 8 and a second position for closing the pressure relief hole 8. A screw plug rod 12 is threadedly connected to the pressure relief groove 9. The sealing rod 10 has a connecting groove 13. The screw plug rod 12 is inserted into the connecting groove 13 and abuts against the sealing rod 10 through a disc spring 14.
[0016] Specifically, the sealing rod 10 has a first oil inlet hole 15 and a first oil outlet hole 16 that communicate with the connecting groove 13, and the first oil outlet hole 16 communicates with the drain hole 11.
[0017] In order to cooperate with the operation of the first oil inlet hole 15 and the first oil outlet hole 16, the screw plug rod 12 is provided with an oil passage chamber 17. The oil passage chamber 17 also has a second oil inlet hole 18 and a second oil outlet hole 19. When the sealing rod 10 is in the first position, the second oil inlet hole 18 is connected to the first oil inlet hole 15, and the second oil outlet hole 19 is connected to the first oil outlet hole 16.
[0018] The oil drain hole 11 is equipped with a filter plug 20, which prevents external impurities from entering the automatic pressure relief mechanism.
[0019] Specifically, the pressure relief hole 8, pressure relief groove 9, sealing rod 10 and oil drain hole 11 are provided on the side wall of the upper connector 2. The upper connector 2 is connected to the spindle 1. The spindle 1 is also connected to the upper cylinder liner 3, the middle cylinder liner 4, the pressure cap 5 and the lower connector 6 in sequence. An oil cavity 7 is provided between the spindle 1 and the upper connector 2, the upper cylinder liner 3 and the middle cylinder liner 4. The pressure relief hole 8 of the upper connector 2 is connected to the oil cavity 7.
[0020] After the automatic pressure relief mechanism has been working for a certain period of time, the oil pressure inside the mechanism is greater than that outside. As the oil temperature rises, the oil volume increases, and the oil pressure also rises. When the oil pressure exceeds the design value, the oil rushes into the pressure relief hole 8 and pushes the sealing rod 10, so that the sealing rod 10 is in the first position. The high-pressure oil will then enter the pressure relief groove 9 and flow out from the oil drain hole 11 connected to the pressure relief groove 9. When the pressure relief ends, the oil pressure in the oil chamber 7 returns to normal, and the sealing rod 10 is in the second position, blocking the pressure relief hole 8. This design can effectively alleviate the high temperature caused by the high oil pressure of the hydraulic accelerator, reduce the probability of metal thermal deformation fatigue strength reduction, and extend the service life of the hydraulic accelerator.
[0021] In this embodiment, in order to facilitate the high-pressure oil to push the sealing rod 10, the sealing rod 10 is designed with an inverted cone shape, and the cone tip is inserted into the pressure relief hole 8. When the high-pressure oil rushes into the pressure relief hole 8, the high-pressure oil can move along the two cone sides towards the pressure relief groove 9, which facilitates the high-pressure oil to push the sealing rod 10.
[0022] The pressure relief groove 9 is internally threaded with a screw plug rod 12, and the sealing rod 10 has a connecting groove 13. The screw plug rod 12 is inserted into the connecting groove 13 and abuts against the sealing rod 10 through a disc spring. The screw plug rod 12 serves as a fixing rod and abuts against the sealing rod 10 through a disc spring 14. It can also serve as a leverage point for the sealing rod 10 so that the sealing rod 10 can switch between the first position and the second position.
[0023] In addition to the preferred embodiments described above, there are other embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection claimed by this utility model.
Claims
1. An automatic pressure relief mechanism, characterized in that: It includes a pressure relief hole (8), a pressure relief groove (9), a sealing rod (10), and an oil drain hole (11). The pressure relief groove (9) is connected to the oil chamber (7) through the pressure relief hole (8). The oil drain hole (11) is connected to the pressure relief groove (9). The sealing rod (10) is set in the pressure relief groove (9) and has a first position for opening the pressure relief hole (8) and a second position for closing the pressure relief hole (8). A screw plug rod (12) is threadedly connected in the pressure relief groove (9). The sealing rod (10) has a connecting groove (13). The screw plug rod (12) is inserted into the connecting groove (13) and abuts against the sealing rod (10) through a disc spring (14).
2. The automatic pressure relief mechanism according to claim 1, characterized in that: The sealing rod (10) has a first oil inlet (15) and a first oil outlet (16) that communicate with the connecting groove (13), and the first oil outlet (16) communicates with the drain hole (11).
3. The automatic pressure relief mechanism according to claim 1, characterized in that: The screw plug rod (12) is provided with an oil passage cavity (17), and the oil passage cavity (17) also has a second oil inlet hole (18) and a second oil outlet hole (19). When the sealing rod (10) is in the first position, the second oil inlet hole (18) is connected to the first oil inlet hole (15), and the second oil outlet hole (19) is connected to the first oil outlet hole (16).
4. The automatic pressure relief mechanism according to claim 1, characterized in that: The oil drain hole (11) is equipped with a filter plug (20).
5. The automatic pressure relief mechanism according to claim 1, characterized in that: The pressure relief hole (8), pressure relief groove (9), sealing rod (10) and oil drain hole (11) are provided on the side wall of the upper connector (2). The upper connector (2) is connected to the spindle (1). The spindle (1) is also connected to the upper cylinder liner (3), the middle cylinder liner (4), the pressure cap (5) and the lower connector (6) in sequence. An oil cavity (7) is provided between the spindle (1) and the upper connector (2), the upper cylinder liner (3) and the middle cylinder liner (4). The pressure relief hole (8) of the upper connector (2) is connected to the oil cavity (7).