High-low voltage conversion multifunction switch tool

Abstract

The application relates to the technical field of oil well operation, in particular to a high-low pressure conversion multifunctional switch tool. The tool comprises an upper joint, one end of the upper joint is fixedly provided with an outer cylinder, a plurality of first circulation holes in annular array arrangement are penetrated through the inner wall of the outer cylinder, a sealing shaft core is slidably installed in the outer cylinder, an inner core shaft is slidably installed in the sealing shaft core, a limiting baffle is fixedly installed in the sealing shaft core, a resin ball located between the inner core shaft and the limiting baffle is rollingly installed in the sealing shaft core, the resin ball is matched with the opening of one end of the inner core shaft, and the sealing shaft core and the outer cylinder are provided with a same closing pin. Through the simple pressure opening mechanism, the low-pressure rapid opening of the packer can be realized, the problem that the packer is heavy and is inconvenient to disassemble due to the mechanical auxiliary opening mechanism is avoided, complicated maintenance work is avoided, long-term use is facilitated, and the problem that the packer oil and gas leaks can be effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of oil well operation technology, specifically to a high-low pressure conversion multi-functional switch tool. Background Technology

[0002] With the continuous development of the economy, people's demand for oil resources is constantly increasing. A large number of oil wells are put into crude oil and combustible gas extraction. When drilling branch wells of the main well, the pressure of each branch is not the same. After the first branch well is completed, drilling needs to continue. In the vertical well, the orientation window is opened and a new branch well is drilled until the remaining wells are completed. In this process, when drilling a new branch well, packers need to be installed to protect the low-pressure layer of the well that was completed in the early stage. However, when setting the packer, a higher pressure is required to set and anchor the packer.

[0003] However, existing packers for oil and gas wells are not convenient for low-pressure and rapid opening during oil and gas extraction. They generally use mechanical auxiliary opening mechanisms, which can easily lead to a heavy packer, making it inconvenient to install and remove the packer, and also making it difficult to maintain. Long-term use poses a risk of oil and gas leakage. Summary of the Invention

[0004] To address the above problems, the present invention aims to provide a multi-functional high-low voltage switching tool to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a high-low voltage conversion multi-functional switch tool, comprising an upper connector, one end of which is fixedly fitted with an outer cylinder, the inner wall of which has a plurality of first circulation holes arranged in a ring array, a sealing shaft core slidably installed inside the outer cylinder, an inner mandrel slidably installed inside the sealing shaft core, a limit baffle fixedly installed inside the sealing shaft core, a resin ball rollingly installed inside the sealing shaft core between the inner mandrel and the limit baffle, the resin ball being adapted to one end opening of the inner mandrel, the sealing shaft core and the outer cylinder having the same closing pin, the side wall of the sealing shaft core having a plurality of filter holes arranged in a ring array, the inner wall of the inner mandrel having a plurality of second circulation holes arranged in a ring array, a shearing retaining ring fitted on the inner mandrel, a transposition connector slidably fitted at the end of the inner mandrel away from the upper connector, the transposition connector slidably installed outside the outer cylinder, a setting pin slidably installed on the inner wall of the transposition connector, the setting pin... One end is fixedly installed on the inner mandrel. A first anti-top opening ring is fixedly sleeved on the shifting connector. The first anti-top opening ring is slidably connected to the inner wall of the outer cylinder. A release connector is sleeved on the shifting connector. A release sleeve is slidably installed inside the release connector. One end of the inner mandrel slidably extends into the release sleeve. The release sleeve and the release connector are provided with the same first release pin. A shifting opening ring located between the shifting connector and the release sleeve is slidably sleeved on the inner mandrel. A second anti-top opening ring slidably connected to the inner wall of the outer cylinder is fixedly sleeved on the release connector. A release segment is slidably installed inside the outer cylinder. The end of the release sleeve away from the upper connector slidably extends into the release segment. A first spring seat is fixedly installed on the release segment. A spring mandrel is fixedly and penetrates the first spring seat. A first spring with one end in contact with the first spring seat is slidably sleeved on the spring mandrel. The spring mandrel is slidably connected to the inner wall of the inner mandrel. The first spring is in contact with one end of the inner mandrel.

[0006] To avoid the issue of requiring high pressure to start the tool:

[0007] As a further improvement to the above technical solution: the outer cylinder further includes an upper piston outer cylinder and a lower piston outer cylinder. One end of the upper piston outer cylinder is slidably installed inside the outer cylinder, and one end of the lower piston outer cylinder is slidably installed inside the end of the upper piston outer cylinder away from the upper connector. The inner wall of the upper piston outer cylinder is provided with a plurality of exhaust holes arranged in a ring array. A one-way vent valve is fixedly installed in the exhaust holes. A piston mandrel is provided inside the upper piston outer cylinder and the lower piston outer cylinder. Two inner pistons and a plurality of inner piston retaining rings are fixedly sleeved on the piston mandrel. The two inner pistons are slidably installed inside the upper piston outer cylinder and the lower piston outer cylinder, respectively. The inner pistons are located between the corresponding two inner piston retaining rings. A piston limiting connector is fixedly sleeved at the end of the lower piston outer cylinder away from the upper connector. A one-way valve body is fixedly installed inside the piston limiting connector. One end of the one-way valve body extends outside the piston limiting connector. A guide shoe is fixedly sleeved at the end of the one-way valve body away from the piston limiting connector. The end of the piston mandrel away from the outer cylinder slides into the piston limiting connector.

[0008] The beneficial effects of this improvement are: by setting it up in this way, it is possible to circulate oil and gas in the well and effectively reduce the internal pressure of the tool, thereby avoiding the problem of needing high pressure to open the tool, which brings great convenience to oil and gas extraction.

[0009] To facilitate reducing the internal pressure of the tool:

[0010] As a further improvement to the above technical solution: the one-way valve body also includes a one-way valve piston, the one-way valve piston is slidably installed in the one-way valve body, a second spring seat is slidably installed in the one-way valve body, the second spring seat is provided with a second spring, the second spring is slidably installed in the one-way valve body and contacts the end of the one-way valve piston away from the upper connector, and a thrust ring is fixedly installed in the one-way valve body, the thrust ring contacts the side of the second spring seat near the guide shoe.

[0011] The beneficial effect of this improvement is that, by setting it up in this way, it is possible to store and buffer oil and gas, which makes it easier to reduce the pressure inside the tool.

[0012] To facilitate effective fixing and connection of components:

[0013] As a further improvement to the above technical solution: the upper connector and the outer cylinder are fixedly connected by a first anti-reverse pin, and the shifting connector and the release connector are both fixedly connected to the sealing shaft core by a second anti-reverse pin.

[0014] The beneficial effect of this improvement is that by setting the first anti-reverse pin and the second anti-reverse pin, the component can be effectively fixed.

[0015] To facilitate the fixed connection of various components:

[0016] As a further improvement to the above technical solution: the outer cylinder and the lower piston outer cylinder are both fixedly connected to the upper piston outer cylinder by a third anti-reverse pin, the lower piston outer cylinder and the one-way valve body are both fixedly connected to the piston limiting joint by a fourth anti-reverse pin, and a third circulation hole is penetrating the inner wall of the one-way valve body.

[0017] The beneficial effect of this improvement is that by setting a second anti-reverse pin and a third anti-reverse pin, the fixed connection of each component can be achieved.

[0018] To prevent moving parts from jamming:

[0019] As a further improvement to the above technical solution: a filter screen plate is fixedly installed inside the filter hole. The filter screen plate has an arc-shaped structure. A repositioning groove is provided on the outer wall of the inner core shaft. The repositioning groove is adapted to the repositioning opening ring.

[0020] The beneficial effects of this improvement are: by setting up a filter screen, mud and sand can be filtered out, preventing them from entering the inner core shaft and thus preventing moving parts from getting stuck.

[0021] To facilitate the opening and closing of the first circulation hole:

[0022] As a further improvement to the above technical solution: four sealing rings are fixedly sleeved on the sealing shaft core, the four sealing rings are divided into two groups, the sealing rings are slidably connected to the inner wall of the outer cylinder, and the sealing rings are adapted to the first circulation hole.

[0023] The beneficial effect of this improvement is that by setting a sealing ring, the opening and closing of the first circulation hole can be achieved.

[0024] To facilitate the release of the segmented parts, they should move in contact with the limiting position under appropriate pressure:

[0025] As a further improvement to the above technical solution: a second release pin slides through the release segment, and the second release pin is fixedly connected to both the first spring seat and the inner wall of the outer cylinder.

[0026] The beneficial effects of this improvement are: by setting a second release pin, it is easier to limit the release segment, and the release segment can move by contacting the limit under appropriate pressure.

[0027] The beneficial effects of this invention are as follows: by using a simple pressure opening mechanism, the packer can be opened quickly under low pressure, avoiding the problem of the packer being too heavy and difficult to disassemble and assemble due to the mechanical auxiliary opening mechanism, and avoiding cumbersome maintenance work, which facilitates long-term use and can effectively reduce the problem of packer oil and gas leakage. Attached Figure Description

[0028] Figure 1 This is a schematic cross-sectional view of the three-dimensional main view portion of the present invention;

[0029] Figure 2 This is a three-dimensional front view cross-sectional structural diagram of the low-pressure opening mechanism in this invention;

[0030] Figure 3 This is a three-dimensional front view cross-sectional structural diagram of the liquid storage mechanism in this invention;

[0031] Figure 4 This is a three-dimensional front view sectional view of the buffer pressure relief mechanism in this invention.

[0032] Figure 5 This is a side sectional view of the present invention.

[0033] In the diagram: 1. Upper connector; 2. First anti-reverse pin; 3. Outer cylinder; 4. First circulation hole; 5. Sealing shaft; 6. Inner mandrel; 7. Limiting baffle; 8. Resin ball; 9. Closing pin; 10. Filter hole; 11. Second circulation hole; 12. Shear retaining ring; 13. Setting pin; 14. First anti-jacking opening ring; 15. Transposition connector; 16. Transposition opening ring; 17. First release pin; 18. Release connector; 19. Second anti-jacking opening ring; 20. 21. Release sleeve; 22. Release flap; 23. First spring; 24. Spring spindle; 25. First spring seat; 26. Upper piston outer cylinder; 27. Exhaust port; 28. One-way vent valve; 29. ​​Inner piston retaining ring; 30. Inner piston; 31. Lower piston outer cylinder; 32. Piston spindle; 33. Piston limit joint; 34. One-way valve body; 35. One-way valve piston; 36. Second spring; 37. Second spring seat; 38. Thrust ring; 39. Guide shoe. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0035] like Figure 1-5As shown, a high-low voltage conversion multi-functional switch tool includes an upper connector 1. An outer cylinder 3 is fixedly fitted onto one end of the upper connector 1. Multiple first circulation holes 4 arranged in a circular array are penetrating the inner wall of the outer cylinder 3. A sealing shaft core 5 is slidably installed inside the outer cylinder 3. An inner mandrel 6 is slidably installed inside the sealing shaft core 5. A limit baffle 7 is fixedly installed inside the sealing shaft core 5. A resin ball 8 is rolled inside the sealing shaft core 5, located between the inner mandrel 6 and the limit baffle 7. The resin ball 8 is adapted to the opening at one end of the inner mandrel 6. The sealing shaft core 5 and the outer cylinder 3 are provided with the same closing pin 9. Multiple filter holes 10 are arranged in a circular array on the side wall of the sealing shaft core 5. Multiple filter holes 10 are penetrating the inner wall of the inner mandrel 6. The second circulation holes 11 are arranged in a ring array. A shearing retaining ring 12 is sleeved on the inner mandrel 6. A shifting joint 15 is slidably sleeved on the end of the inner mandrel 6 away from the upper connector 1. The shifting joint 15 is slidably installed on the outside of the outer cylinder 3. A setting pin 13 is slidably installed on the inner wall of the shifting joint 15. One end of the setting pin 13 is fixedly installed on the inner mandrel 6. A first anti-top opening ring 14 is fixedly sleeved on the shifting joint 15. The first anti-top opening ring 14 is slidably connected to the inner wall of the outer cylinder 3. A release joint 18 is sleeved on the shifting joint 15. A release sleeve 20 is slidably installed in the release joint 18. One end of the inner mandrel 6 slides into the release sleeve 20. The release sleeve 20 and the release... The connector 18 is provided with the same first release pin 17. The inner mandrel 6 is slidably sleeved with a shifting opening ring 16 located between the shifting connector 15 and the release sleeve 20. The release connector 18 is fixedly sleeved with a second anti-top opening ring 19 that is slidably connected to the inner wall of the outer cylinder 3. A release segment 21 is slidably installed inside the outer cylinder 3. The end of the release sleeve 20 away from the upper connector 1 slides into the release segment 21. A first spring seat 24 is fixedly installed on the release segment 21. A spring mandrel 23 is fixedly and penetrates the first spring seat 24. A first spring 22 with one end in contact with the first spring seat 24 is slidably sleeved on the spring mandrel 23. The spring mandrel 23 is slidably connected to the inner wall of the inner mandrel 6. Spring 22 contacts one end of the inner spindle 6, enabling low-pressure rapid opening of the packer through a simple pressure opening mechanism. This avoids the problems of heavy packer weight and inconvenient disassembly caused by mechanical auxiliary opening mechanisms, and also avoids cumbersome maintenance work, facilitating long-term use and effectively reducing packer oil and gas leakage. The outer cylinder 3 also includes an upper piston outer cylinder 25 and a lower piston outer cylinder 30. One end of the upper piston outer cylinder 25 is slidably installed inside the outer cylinder 3, and one end of the lower piston outer cylinder 30 is slidably installed inside the end of the upper piston outer cylinder 25 away from the upper connector 1. The inner wall of the upper piston outer cylinder 25 has multiple exhaust holes 26 arranged in a ring array, and a one-way vent valve 27 is fixedly installed in each exhaust hole 26.A piston spindle 31 is provided inside the upper piston outer cylinder 25 and the lower piston outer cylinder 30. Two inner pistons 29 and multiple inner piston retaining rings 28 are fixedly sleeved on the piston spindle 31. The two inner pistons 29 are slidably installed inside the upper piston outer cylinder 25 and the lower piston outer cylinder 30, respectively, with the inner pistons 29 located between the corresponding two inner piston retaining rings 28. A piston limiting joint 32 is fixedly sleeved at the end of the lower piston outer cylinder 30 away from the upper connector 1. A one-way valve body 33 is fixedly installed inside the piston limiting joint 32. One end of the one-way valve body 33 extends outside the piston limiting joint 32. A guide shoe 38 is fixedly sleeved at the end of the one-way valve body 33 away from the piston limiting joint 32. The piston spindle 31 slides at the end away from the outer cylinder 3. The piston extends into the piston limiting joint 32. This design enables the circulation of oil and gas within the well and effectively reduces the internal pressure of the tool, thus avoiding the need for high pressure to open the tool and greatly facilitating oil and gas extraction. The one-way valve body 33 also includes a one-way valve piston 34, which is slidably installed within the one-way valve body 33. A second spring seat 36 is slidably installed within the one-way valve body 33, and a second spring 35 is provided on the second spring seat 36. The second spring 35 is slidably installed within the one-way valve body 33 and contacts the end of the one-way valve piston 34 away from the upper joint 1. A thrust ring 37 is fixedly installed within the one-way valve body 33. The thrust ring 37 and the second spring... The spring seat 36 contacts the side near the guide shoe 38. This arrangement enables the storage and buffering of oil and gas, facilitating the reduction of internal pressure in the tool. The upper connector 1 and the outer cylinder 3 are fixedly connected by the first anti-reverse pin 2. The shift connector 15 and the release connector 18 are both fixedly connected to the sealing shaft core 5 by the second anti-reverse pin. By setting the first and second anti-reverse pins, the components can be effectively fixed. The outer cylinder 3 and the lower piston outer cylinder 30 are both fixedly connected to the upper piston outer cylinder 25 by the third anti-reverse pin. The lower piston outer cylinder 30 and the one-way valve body 33 are both fixedly connected to the piston limit connector 32 by the fourth anti-reverse pin. A third circulation hole penetrates the inner wall of the one-way valve body 33. By setting the second anti-reverse pin... The system includes a retraction pin and a third anti-retraction pin, which securely connect the various components. A filter screen plate with an arc-shaped structure is fixedly installed inside the filter hole 10. A displacement groove is provided on the outer wall of the inner core shaft 6, which is adapted to the displacement opening ring 16. By setting the filter screen plate, sediment can be filtered to prevent it from entering the inner core shaft 6 and thus preventing the moving parts from getting stuck. Four sealing rings are fixedly fitted on the sealing core 5, and the four sealing rings are divided into two groups. The sealing rings are slidably connected to the inner wall of the outer cylinder 3 and are adapted to the first circulation hole 4. By setting the sealing rings, the opening and closing of the first circulation hole 4 can be achieved. A second release pin slides through the release segment 21.The second release pin is fixedly connected to both the first spring seat 24 and the inner wall of the outer cylinder 3. By providing the second release pin, the release segment 21 is easily limited, allowing it to move under appropriate pressure.

[0036] The working principle of this invention is as follows: In use, the switching tool is installed on the packer, and then the packer is placed in the oil and gas well along with the wellbore. Oil and gas then enter the outer cylinder 3 through multiple first circulation holes 4, then through multiple filter holes 10 into the sealing core 5 and are filtered. Next, they enter the inner core 6 through multiple second circulation holes 11, and then through the inner core 6, spring core 23, and piston core 31 into the check valve body 33. Under pressure, the check valve piston 34 is pushed laterally, compressing the second spring 35 until the check valve piston 34 passes the third circulation hole, and the oil and gas flow out through the third circulation hole, thus forming a circulation of oil and gas in the well. Subsequently, a pressure of 7-10 MPa is applied at the wellhead, pushing the sealing core 5 to slide within the outer cylinder 3. This causes the closing pin 9 to be sheared off. Simultaneously, the sealing core 5 pushes the transposition joint 15, release joint 18, and release sleeve 20 to move laterally away from the upper joint 1. The inner core 6 is driven to move laterally until the release joint 18 contacts the release split 21. The first spring 22 is compressed by the inner core 6, and the spring core 23 slides into the inner core 6. At the same time, the four sealing rings on the sealing core 5 seal multiple first circulation holes 4, and the circulation of oil and gas in the well is closed. The second spring 35 pops out, causing the single-flow valve piston 34 to be pushed laterally and close to the upper joint 1, thus closing the third circulation hole. External oil and gas are isolated, and the pressure inside the switching tool is lower than the pressure inside the oil and gas well. Subsequently, the wellhead pressure is increased to 27-30 MPa, and the inner core... As shaft 6 continues to move laterally, the setting pin 13 is sheared by the shearing ring 12, the first spring 22 is further compressed, and the pressure drops suddenly. The shearing ring 12 returns to its free state, and then the wellhead pressure is reduced. The first spring 22 pushes the inner mandrel 6 to reset and exceed its initial position. The transposition opening ring 16 retracts and slides into the transposition groove on the outside of the inner mandrel 6. During oil and gas production, the wellhead is first pressurized to 7-10 MPa. The inner mandrel 6 is pushed laterally away from the upper connector 1, causing the transposition opening ring 16 located in the transposition groove to move laterally. At the same time, the transposition opening ring 16 pushes the release sleeve 20 laterally, causing the first release pin 17 to be sheared. The split part of the release segment 21 enters the release groove of the release sleeve 20. Under the action of the wellhead pressure... The sealing core 5 is pushed laterally away from the upper connector 1 again, causing the transposition connector 15, release connector 18, release sleeve 20, and release splitter 21 to be pushed laterally until they contact the upper piston outer cylinder 25. Multiple first circulation holes 4 are reopened, and the first anti-top opening ring 14 enters the stepped groove on the inner wall of the outer cylinder 3 to prevent the sealing core 5 from resetting. Under the annual pressure of the oil and gas well, oil and gas flow out through multiple first circulation holes 4 and the upper connector 1, thereby realizing oil and gas production. With this setting, the packer can be opened quickly under low pressure, avoiding the problem of the packer being too heavy and inconvenient to disassemble and assemble due to the mechanical auxiliary opening mechanism, and avoiding cumbersome maintenance work, which is convenient for long-term use and can effectively reduce the problem of packer oil and gas leakage.

[0037] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or changes can be made without departing from the principles of the present invention, and the above technical features can also be combined in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A high-low voltage conversion multi-functional switch tool, including an upper connector (1), characterized in that: One end of the upper connector (1) is fixedly fitted with an outer cylinder (3). Multiple first circulation holes (4) arranged in a circular array are perforated on the inner wall of the outer cylinder (3). A sealing shaft core (5) is slidably installed inside the outer cylinder (3). An inner mandrel (6) is slidably installed inside the sealing shaft core (5). A limiting baffle (7) is fixedly installed inside the sealing shaft core (5). A resin ball (8) is rolled inside the sealing shaft core (5) between the inner mandrel (6) and the limiting baffle (7). The resin ball (8) is adapted to the opening at one end of the inner mandrel (6). The sealing shaft core (5) and the outer cylinder (3) are provided with the same closing pin (9). The sealing shaft core (5) has multiple filter holes (10) arranged in a ring array on its side wall. The inner core shaft (6) has multiple second circulation holes (11) arranged in a ring array through its inner wall. A shearing retaining ring (12) is fitted on the inner core shaft (6). A shifting joint (15) is slidably fitted on the end of the inner core shaft (6) away from the upper connector (1). The shifting joint (15) is slidably installed outside the outer cylinder (3). A setting pin (13) is slidably installed on the inner wall of the shifting joint (15). One end of the setting pin (13) is fixedly installed on the inner core shaft (6). A first anti-separation ring is fixedly fitted on the shifting joint (15). The top opening ring (14) is slidably connected to the inner wall of the outer cylinder (3). The repositioning joint (15) is fitted with a release joint (18). A release sleeve (20) is slidably installed inside the release joint (18). One end of the inner spindle (6) extends slidably into the release sleeve (20). The release sleeve (20) and the release joint (18) are provided with the same first release pin (17). The inner spindle (6) is slidably fitted with a repositioning opening ring (16) located between the repositioning joint (15) and the release sleeve (20). The release joint (18) is fixedly fitted with a ring that is connected to the inner wall of the outer cylinder (3). The second anti-top opening ring (19) is slidably connected. A release segment (21) is slidably installed inside the outer cylinder (3). The end of the release sleeve (20) away from the upper connector (1) extends slidably into the release segment (21). A first spring seat (24) is fixedly installed on the release segment (21). A spring spindle (23) is fixed and passes through the first spring seat (24). A first spring (22) with one end in contact with the first spring seat (24) is slidably sleeved on the spring spindle (23). The spring spindle (23) is slidably connected to the inner wall of the inner spindle (6). The first spring (22) is in contact with one end of the inner spindle (6).

2. The high-low voltage conversion multi-functional switch tool according to claim 1, characterized in that: The outer cylinder (3) further includes an upper piston outer cylinder (25) and a lower piston outer cylinder (30). One end of the upper piston outer cylinder (25) is slidably installed inside the outer cylinder (3), and one end of the lower piston outer cylinder (30) is slidably installed inside the end of the upper piston outer cylinder (25) away from the upper connector (1). Multiple exhaust holes (26) arranged in a ring array are provided on the inner wall of the upper piston outer cylinder (25). A one-way vent valve (27) is fixedly installed in the exhaust hole (26). A piston mandrel (31) is provided inside the upper piston outer cylinder (25) and the lower piston outer cylinder (30). Two inner pistons (29) and multiple inner piston retaining rings (28) are fixedly sleeved on the piston mandrel (31). The inner piston (29) is slidably installed in the upper piston outer cylinder (25) and the lower piston outer cylinder (30) respectively. The inner piston (29) is located between the two corresponding inner piston retaining rings (28). The lower piston outer cylinder (30) is fixedly fitted with a piston limiting joint (32) at the end away from the upper connector (1). A one-way valve body (33) is fixedly installed in the piston limiting joint (32). One end of the one-way valve body (33) extends to the outside of the piston limiting joint (32). A guide shoe (38) is fixedly fitted at the end of the one-way valve body (33) away from the piston limiting joint (32). The piston spindle (31) extends slidably into the piston limiting joint (32) at the end away from the outer cylinder (3).

3. The high-low voltage conversion multi-functional switch tool according to claim 2, characterized in that: The single-flow valve body (33) also includes a single-flow valve piston (34), which is slidably installed inside the single-flow valve body (33). A second spring seat (36) is slidably installed inside the single-flow valve body (33). A second spring (35) is provided on the second spring seat (36). The second spring (35) is slidably installed inside the single-flow valve body (33) and contacts the end of the single-flow valve piston (34) away from the upper connector (1). A thrust ring (37) is fixedly installed inside the single-flow valve body (33). The thrust ring (37) contacts the side of the second spring seat (36) near the guide shoe (38).

4. The high-low voltage conversion multi-functional switch tool according to claim 1, characterized in that: The upper connector (1) and the outer cylinder (3) are fixedly connected by the first anti-reverse pin (2), and the shift connector (15) and the release connector (18) are both fixedly connected to the sealing shaft core (5) by the second anti-reverse pin.

5. The high-low voltage conversion multi-functional switch tool according to claim 3, characterized in that: The outer cylinder (3) and the lower piston outer cylinder (30) are both fixedly connected to the upper piston outer cylinder (25) by a third anti-reverse pin. The lower piston outer cylinder (30) and the one-way valve body (33) are both fixedly connected to the piston limit joint (32) by a fourth anti-reverse pin. A third circulation hole is penetrating the inner wall of the one-way valve body (33).

6. The high-low voltage conversion multi-functional switch tool according to claim 1, characterized in that: A filter screen plate is fixedly installed inside the filter hole (10). The filter screen plate has an arc-shaped structure. A displacement groove is provided on the outer wall of the inner core shaft (6). The displacement groove is adapted to the displacement opening ring (16).

7. The high-low voltage conversion multi-functional switch tool according to claim 1, characterized in that: Four sealing rings are fixedly sleeved on the sealing shaft core (5). The four sealing rings are divided into two groups. The sealing rings are slidably connected to the inner wall of the outer cylinder (3). The sealing rings are adapted to the first circulation hole (4).

8. The high-low voltage conversion multi-functional switch tool according to claim 1, characterized in that: A second release pin slides through the release segment (21), and the second release pin is fixedly connected to the inner wall of the first spring seat (24) and the outer cylinder (3).

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