Double-control current stabilizing device

Abstract

This utility model discloses a dual-control flow stabilizing device, relating to the field of valve technology. The dual-control flow stabilizing device includes a main body, a back pressure valve seat, a bypass valve core, and a first reset component. The main body is hollow and has openings at both ends. A first bypass hole is provided on the side wall of the main body. The back pressure valve seat is installed inside the main body, and a back pressure valve core is fitted onto the back pressure valve seat. The bypass valve core has an annular structure with a water passage hole in its center. A second bypass hole is provided on the side wall of the bypass valve core, connecting the bypass valve core to the back pressure valve core. The first reset component is installed in the main body and provides a preload force to the bypass valve core towards the back pressure valve seat. This significantly reduces the length of the drill bit, especially shortening the distance between the measuring instrument and the drill bit, improving the accuracy and convenience of zero-length inclination measurement.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and more specifically, to a dual-control flow stabilizing device. Background Technology

[0002] During oil drilling operations, a bypass valve is usually connected to the upper end of the screw drill string. This valve helps balance the pressure difference between the inside and outside of the drill string during tripping in and out of the drill string, especially reducing surface grouting during tripping. When the pump is started, the bypass valve is closed to ensure that the drilling fluid flows through the motor, converting hydraulic energy into mechanical energy. At the same time, to prevent complex accidents such as overflow and blowout, a back pressure valve is usually connected to the upper end of the bypass valve of the screw drill string to ensure operational safety.

[0003] However, installing both the bypass valve and the back pressure valve requires multiple connectors, which increases the overall size of the drill string. This increases the distance between the measuring instrument and the drill bit, making it difficult to reduce the zero length of the inclination measurement. Furthermore, multiple connectors can increase the instability of the drill string assembly.

[0004] In summary, how to reduce the distance between the measuring instrument and the drill bit is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a dual-control flow stabilization device, which adopts a structure that combines a back pressure valve and a bypass valve, reduces the data used in the drill bit connector, greatly reduces the length of the drill bit, and in particular shortens the distance between the measuring instrument and the drill bit, thereby improving the accuracy and convenience of zero length measurement.

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

[0007] A dual-control current stabilizing device, comprising:

[0008] The main body is hollow and has openings at both ends, and the side wall of the main body has a first bypass hole;

[0009] A back pressure valve seat is installed inside the main body, and a back pressure valve core is provided in cooperation with the back pressure valve seat;

[0010] A bypass valve core, wherein the bypass valve core has an annular structure, a water passage hole is provided in the middle of the bypass valve core, a second bypass hole is provided on the side wall of the bypass valve core, and the bypass valve core is connected to the back pressure valve core;

[0011] A first reset element is mounted on the main body and is used to provide a preload force to the bypass valve core in the direction of the back pressure valve seat.

[0012] Furthermore, this utility model also includes:

[0013] A bypass valve seat is fixed inside the main body. The bypass valve seat has a third bypass hole coaxial with the first bypass hole. The bypass valve seat is located between the main body and the bypass valve core. When the back pressure valve core contacts the back pressure valve seat, the first bypass hole, the second bypass hole and the third bypass hole are coaxial.

[0014] Furthermore, in this utility model, the bypass valve core is a rotating component with an L-shaped cross-section. The bypass valve core includes a moving part and a sliding part. The second bypass hole is disposed in the sliding part. The sliding part is in sliding contact with the bypass valve seat. The moving part is in sliding contact with the inner wall of the main body. The end of the moving part is provided with a limiting member for restricting the circumferential rotation of the bypass valve core.

[0015] Furthermore, in this utility model, the bypass valve seat is a rotating component with an L-shaped cross-section, and the first reset component is located between the main body and the bypass valve seat.

[0016] Furthermore, this utility model also includes:

[0017] A valve stem passes through a water passage hole, one end of which is fixedly connected to the back pressure valve core, and the other end of which is connected to the bypass valve core.

[0018] Furthermore, this utility model also includes:

[0019] The second reset member is disposed between the bypass valve core and the valve stem. The second reset member is fixedly connected to the bypass valve core and is used to provide a preload force to the valve stem in the direction of the back pressure valve seat.

[0020] Furthermore, in this invention, both the first reset member and the second reset member are springs, and the elastic coefficient of the second reset member is greater than that of the first reset member.

[0021] Furthermore, in this invention, the back pressure valve core has a frustum-shaped structure, and the back pressure valve seat has a similar shape to the back pressure valve core.

[0022] Furthermore, this utility model also includes:

[0023] An anti-detachment cap is located inside the main body on the side away from the back pressure valve seat, and the anti-detachment cap is fixed in position to the main body.

[0024] Furthermore, the main body is provided with a plurality of inclined surfaces for reducing flow resistance.

[0025] In use, the dual-control flow stabilization device of this utility model places the back pressure valve seat, bypass valve core, and first reset component within a hollow main body. Both ends of the main body are connected to the drill bit. A first bypass hole is provided on the side wall of the main body. The bypass valve core has an annular structure with a water passage hole in its center. A second bypass hole is provided on the side wall of the bypass valve core. The water passage hole allows the drilling fluid to directly act on the drill bit after passing through the back pressure valve seat, converting hydraulic energy into mechanical energy to drive the drill bit to break rock. The second bypass hole, in conjunction with the first bypass hole, enables the bypass valve to function, allowing bypass operation even when the pump is stopped. With the orifice open and the back pressure valve closed, accidents such as overflow and blowout can be avoided, ensuring construction safety. When the pump is running, the back pressure valve core is driven downward by the liquid force, simultaneously moving the bypass valve core, causing the first and second bypass orifices to be misaligned, i.e., the bypass orifice is closed, ensuring stable operation when the pump is running. The clever combination of the bypass valve and the back pressure valve achieves dual-control flow stabilization, ensuring the required functions while reducing the number of connectors used, thereby greatly shortening the zero length of the inclination measurement, reducing the number of bottom hole joints, and improving drilling construction safety. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0027] Figure 1 A schematic diagram of the device provided by this utility model in the pump-stopped state;

[0028] Figure 2 A schematic diagram of the device provided by this utility model in the state of raising the drilling tool;

[0029] Figure 3 This is a structural schematic diagram of a specific embodiment two provided by this utility model.

[0030] Figures 1-3 In the accompanying drawings, the reference numerals include:

[0031] 1. Main body; 2. Back pressure valve seat; 3. Back pressure valve core; 4. Valve stem; 5. First reset component; 6. Bypass valve core; 601. Moving part; 602. Sliding part; 7. Second reset component; 8. Second bypass hole; 9. Third bypass hole; 10. First bypass hole; 11. Bypass valve seat; 12. Anti-detachment cap. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] The core of this utility model is to provide a dual-control flow stabilization device, which adopts a structure that combines a back pressure valve and a bypass valve, reducing the data used in the drill bit connector, greatly reducing the length of the drill bit, especially shortening the distance between the measuring instrument and the drill bit, and improving the accuracy and convenience of zero length measurement.

[0034] Please refer to Figure 2 A dual-control flow stabilization device includes a main body 1, which is hollow and has openings at both ends. The side wall of the main body 1 has a first bypass hole 10. In other words, the main body 1 is a shell structure, hollow inside with openings at both ends for connection to drilling tools. Specifically, both ends of the main body 1 have flanges, which seal and fix the main body 1 to the drilling tools and drill pipe. It also includes a backpressure valve seat 2, installed inside the main body 1. A backpressure valve core 3 is fitted onto the backpressure valve seat 2. The cooperation of the backpressure valve seat 2 and the backpressure valve core 3 seals the entire main body 1, allowing drilling fluid to flow in or out only through the bypass hole. A bypass valve core 6 is annular in structure. The middle part of the bypass valve core 6 is provided with a water passage hole, and the side wall of the bypass valve core 6 is provided with a second bypass hole 8. The bypass valve core 6 is connected to the back pressure valve core 3, and a first reset member 5 is also provided. The first reset member 5 is installed on the main body 1 and is used to provide a pre-tightening force to the bypass valve core 6 in the direction of the back pressure valve seat 2. Thus, the bypass hole is opened and closed through the bypass valve core 6. Since the bypass valve core 6 is connected to the back pressure valve core 3, the back pressure valve core 3 and the bypass valve core will move synchronously. Therefore, the bypass valve core and the back pressure valve core 3 can open one of them at the same time, or keep them in a half-open state at the same time. This is to maintain the normal flow of drilling fluid in the drill string while preventing formation fluid from entering the wellbore, which could lead to complex accidents such as overflow and blowout.

[0035] It should be noted that in this embodiment of the present invention, the main body 1 is a cylindrical structure, and the diameter of its outer wall is the same as the diameter of the drill bit.

[0036] Optionally, in some embodiments, the back pressure valve seat 2 may be integrally molded and fixed to the main body 1.

[0037] Optionally, in some embodiments, the first bypass hole 10 and the second bypass hole 8 have the same diameter, thus ensuring that their flow rates are the same.

[0038] In use, the backpressure valve seat 2, bypass valve core 6, and first reset component 5 are all placed inside the hollow main body 1. Both ends of the main body 1 are connected to the drill bit. The side wall of the main body 1 has a first bypass hole 10. The bypass valve core 6 has an annular structure with a water passage hole in its center. The side wall of the bypass valve core 6 has a second bypass hole 8. The water passage hole allows the drilling fluid to directly act on the drill bit after passing through the backpressure valve seat 2, converting hydraulic energy into mechanical energy to drive the drill bit to break rock. The second bypass hole 8, in conjunction with the first bypass hole 10, functions as a bypass valve; that is, in the pump-stopped state, the bypass hole... When in the open state, the back pressure valve is in the closed state, which can prevent accidents such as overflow and blowout, and ensure construction safety. When the pump is started, the back pressure valve core 3 is driven downward by the liquid force, which simultaneously drives the bypass valve core 6 to move, so that the first bypass hole 10 and the second bypass hole 8 are staggered, that is, the bypass hole is closed, ensuring stable operation when the pump is started. The clever combination of the bypass valve and the back pressure valve realizes the dual control and flow stabilization function, ensuring its required functions while reducing the number of connectors used, thereby greatly shortening the zero length of the inclination measurement, reducing the number of bottom hole joints, and improving drilling construction safety.

[0039] Please refer to Figure 1 In some embodiments, a bypass valve seat 11 is also included. The bypass valve seat 11 is fixed inside the main body 1. The bypass valve seat 11 is provided with a third bypass hole 9 coaxial with the first bypass hole 10. The bypass valve seat 11 is located between the main body 1 and the bypass valve core 6. That is to say, by increasing the sealing strength between multiple bypass holes through the bypass valve seat 11, the use effect of the bypass valve is increased. When the back pressure valve core 3 contacts the back pressure valve seat 2, the first bypass hole 10, the second bypass hole 8 and the third bypass hole 9 are coaxial. That is to say, when the back pressure valve core 3 is in the closed state, after the first bypass hole 10, the second bypass hole 8 and the third bypass hole 9 are aligned, the bypass valve path is opened. At this time, the bypass hole can stabilize the pressure inside and outside the main body 1.

[0040] Optionally, in some embodiments, the first bypass hole 10, the second bypass hole 8, and the third bypass hole 9 have the same diameter, thus ensuring that their flow rates are the same.

[0041] Optionally, in some embodiments, the main body 1 is provided with an annular limiting member. The limiting member and the main body 1 are integrally formed or fixed to the main body 1 with bolts. The limiting member is used to limit the bypass valve seat 11. Specifically, the bypass valve seat 11 and the limiting member are fixed together by bolts.

[0042] Optionally, in some embodiments, the outer wall of the bypass valve core 6 and the bypass valve seat 11 are slidably sealed, which helps to increase the sealing performance of the bypass hole when closed.

[0043] Please continue to refer to this. Figure 1In some embodiments, the bypass valve core 6 is a rotating component with an L-shaped cross-section. The bypass valve core 6 includes a moving part 601 and a sliding part 602. The second bypass hole 8 is provided in the sliding part 602. Specifically, both the moving part 601 and the sliding part 602 are annular with the same inner diameter, and the outer diameter of the moving part 601 is larger than that of the sliding part 602. Therefore, the cross-sections of the moving part 601 and the sliding part 602 are combined to form an L-shaped structure. The sliding part 602 is in sliding contact with the bypass valve seat 11, and the moving part 601 is in sliding contact with the inner wall of the main body 1. This enables the bypass valve to function. The sliding contact between the core 6 and the bypass valve seat 11, and the moving part 601 can also improve the stability of the bypass valve core 6 during the sliding process, and further improve the sealing performance when the bypass hole is closed. Specifically, the end of the moving part 601 is provided with a limiting member for restricting the circumferential rotation of the bypass valve core 6. That is, the outer wall of the moving part 601 is provided with a groove extending along its axial direction, and the main body 1 is provided with a protrusion arranged along the axis of the bypass valve core 6. Therefore, when the groove is engaged with the protrusion, the limiting function of the bypass valve core 6 is realized, and the stability of the bypass valve core 6 during sliding is further improved.

[0044] Optionally, in some embodiments, the bypass valve seat 11 is a rotating component with an L-shaped cross-section. The first reset component 5 is located between the main body 1 and the bypass valve seat 11. That is, the bypass valve seat 11 also adopts the same structure as the bypass valve core 6, and the shorter sides of the bypass valve seat 11 and the bypass valve core 6 are arranged far apart. Therefore, a mounting cavity is formed between the bypass valve core 6, the main body 1 and the bypass valve seat 11. The first reset component 5 is placed between the mounting cavity, which not only realizes the force of the first reset component 5 on the bypass valve core 6, but also ensures the firmness of the position of the first reset component 5, prevents unnecessary shaking, and increases the overall stability of the device.

[0045] Optionally, in some embodiments, the gap between the bypass valve seat 11 and the main body 1 is matched with the first reset member 5, which helps to further improve the stability of the position of the first reset member 5.

[0046] Optionally, in some embodiments, in order to further improve the accuracy of the bypass valve core 6 when the bypass hole is in the open position, a positioning member is installed on the main body 1. The positioning member is located on the side of the bypass valve core 6 away from the bypass valve seat 11. When the back pressure valve core 3 is in the closed state, when the first bypass hole 10, the second bypass hole 8 and the third bypass hole 9 are aligned, the moving part 601 of the bypass valve core 6 contacts the positioning member to achieve accuracy when the bypass valve core 6 is in the open position.

[0047] Please refer to Figure 1In some embodiments, a valve stem 4 is also included. The valve stem 4 passes through the water passage. One end of the valve stem 4 is fixedly connected to the back pressure valve core 3, and the other end of the valve stem 4 is connected to the bypass valve core 6. That is, the back pressure valve core 3 and the bypass valve core 6 are fixedly connected by the valve stem 4, so as to realize the synchronous movement of the back pressure valve core 3 and the bypass valve core 6, which is used to enhance the stability of the back pressure valve core 3 when it moves. The back pressure valve core 3 increases its stability when it moves through the bypass valve core 6.

[0048] Optionally, in some embodiments, a plurality of connecting rods are fixed on the back pressure valve core 3, the connecting rods are perpendicularly arranged with the valve stem 4, and the other end of the connecting rod is in sliding contact with the inner wall of the main body 1, thereby further improving the stability of the back pressure valve core 3 when moving.

[0049] In other embodiments described above, several connecting rods of the back pressure valve core 3 may be slidably connected to the bypass valve core 6.

[0050] Please refer to Figure 1 In some embodiments, a second reset member 7 is also included. The second reset member 7 is disposed between the bypass valve core 6 and the valve stem 4. The second reset member 7 is fixedly connected to the bypass valve core 6. The second reset member 7 is used to provide a preload force to the valve stem 4 in the direction of the back pressure valve seat 2. That is, the valve stem 4 can be pushed to contact the back pressure valve core 3 and the back pressure valve seat 2 through the second reset member 7 to increase its sealing performance. Thus, with the support of the first reset member 5 and the second reset member 7, when the drill is in the pump-stopped state, the back pressure valve core 3 and the back pressure valve seat 2 are in close contact, ensuring the stable closure of the back pressure valve seat 2.

[0051] Optionally, in some embodiments, both the first reset member 5 and the second reset member 7 are springs. Specifically, the first spring is placed between the bypass valve seat 11 and the main body 1, through the annular cavity formed between the bypass valve seat 11 and the main body 1, to increase the stability of the first spring. Furthermore, the end of the first spring can be fixedly connected to the bypass valve core 6 to further increase the stability of the first spring.

[0052] In the above embodiment, the elastic coefficient of the second reset member 7 is greater than that of the first reset member 5. That is, the elastic force of the first spring is less than that of the second spring. Therefore, when the back pressure valve core 3 is in the pump-on state, the back pressure valve core 3 is impacted away from the back pressure valve seat 2 by the drilling fluid. Then, at this time, the bypass valve core 6 moves along with it, squeezing the first spring, which is conducive to the complete closure of the bypass hole.

[0053] In other embodiments, both the first reset member 5 and the second reset member 7 are made of elastic rubber, which can also achieve their reset function.

[0054] Optionally, in some embodiments, one end of the second reset member 7 is fixedly connected to the valve stem 4, while the other end is fixedly connected to the bypass valve core 6.

[0055] Please refer to Figure 1 In some embodiments, the back pressure valve core 3 has a frustum-shaped structure, and the back pressure valve seat 2 has a similar shape to the back pressure valve core 3. By adopting a frustum-shaped structure, the contact area between the back pressure valve seat 2 and the back pressure valve core 3 is increased, thereby enhancing their sealing performance.

[0056] In other embodiments, the back pressure valve core 3 is a hemispherical structure, and the back pressure valve seat 2 is a hemispherical structure that cooperates with the back pressure valve core 3.

[0057] Optionally, in some embodiments, a sealing sleeve is provided on the back pressure valve core 3. The sealing sleeve is made of a flexible material, thus achieving its sealing effect through its flexible material.

[0058] Optionally, in some embodiments, the back pressure valve core 3 and the valve stem 4 are fixed by a threaded connection or by a plug-in connection.

[0059] Please refer to Figure 1 In some embodiments, an anti-dislodgement cap 12 is also included. The anti-dislodgement cap 12 is located inside the main body 1 on the side away from the back pressure valve seat 2. The anti-dislodgement cap 12 is fixed in position with the main body 1. Specifically, the main body 1 is fixedly connected to the drill bit through a connector, while the anti-dislodgement cap 12 is fixedly connected to the drill bit. Therefore, the anti-dislodgement cap and the main body 1 are relatively fixed in position, thereby restricting the position of the valve stem 4 and realizing the anti-dislodgement function.

[0060] Optionally, in some embodiments, the anti-detachment cap 12 is a plate-like structure used to increase its restrictive area on the valve stem 4.

[0061] Optionally, in some embodiments, the main body 1 is provided with a plurality of inclined surfaces for reducing flow resistance. Specifically, the inclined surfaces include an end of the main body 1 located near the back pressure valve seat 2, which is used to guide drilling fluid smoothly into the valve seat. At the same time, the side of the back pressure valve seat 2 away from the back pressure valve core 3 is provided with an inclined surface, which can also guide drilling fluid into the back pressure valve seat 2.

[0062] In the above embodiment, the connection between the moving part 601 and the sliding part 602 of the bypass valve core 6 is provided with an inclined surface toward the back pressure valve core 3, which can reduce the flow resistance of the drilling fluid and increase the impact effect of the drilling fluid.

[0063] In the above embodiment, the inner wall of the main body 1 near the anti-detachment cap 12 is provided with an inclined surface, which is used to guide the drilling fluid to smoothly exit the main body 1 and enter the drilling tool.

[0064] In the above embodiments, the anti-dislodgement cap 12 can adopt a conical or frustum structure, specifically, the side with the smaller area faces the back pressure valve core 3, or the anti-dislodgement cap 12 can adopt a rotating part with a rhomboid cross-section. In this case, both sides of the anti-dislodgement cap 12 can reduce the flow resistance of the drilling fluid.

[0065] In other words, the key point of this utility model is that: the side wall of the body 1 is provided with a first bypass hole 10, the bypass valve core 6 has an annular structure, the middle of the bypass valve core 6 is provided with a water passage hole, and the side wall of the bypass valve core 6 is provided with a second bypass hole 8. The water passage hole is used to allow the drilling fluid to act directly on the drill bit after passing through the back pressure valve seat 2, thereby realizing the conversion of hydraulic energy into mechanical energy to drive the drill bit to break rock. The second bypass hole 8 and the first bypass hole 10 work together to realize the function of the bypass valve, that is, in the pump-stopped state, the bypass hole is in the open state and the back pressure valve is in the closed state. This can prevent accidents such as overflow and blowout, ensuring construction safety. When the pump is running, the back pressure valve core 3 is driven downward by the liquid force, which simultaneously drives the bypass valve core 6 to move, causing the first bypass hole 10 and the second bypass hole 8 to be misaligned, i.e., the bypass hole is closed, ensuring stable operation when the pump is running. The clever combination of the bypass valve and the back pressure valve achieves dual control and flow stabilization, ensuring the required functions while reducing the number of connectors used, thereby greatly shortening the zero length of the inclination measurement, reducing the number of bottom hole joints, and improving drilling construction safety.

[0066] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0067] The present invention provides a detailed description of a dual-control current stabilizing device. Specific examples have been used to illustrate the principle and implementation of the present invention. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core idea of ​​the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A dual-control current stabilizing device, characterized in that, include: The main body (1) is hollow and has openings at both ends. The side wall of the main body (1) is provided with a first bypass hole (10). Back pressure valve seat (2), the back pressure valve seat (2) is installed in the main body (1), and the back pressure valve seat (2) is fitted with a back pressure valve core (3); The bypass valve core (6) has an annular structure. The bypass valve core (6) has a water passage hole in the middle and a second bypass hole (8) on the side wall. The bypass valve core (6) is connected to the back pressure valve core (3). The first reset member (5) is installed on the main body (1) and is used to provide a preload force to the bypass valve core (6) in the direction of the back pressure valve seat (2).

2. The dual-control current stabilizing device according to claim 1, characterized in that, Also includes: A bypass valve seat (11) is fixed inside the main body (1). The bypass valve seat (11) is provided with a third bypass hole (9) coaxial with the first bypass hole (10). The bypass valve seat (11) is located between the main body (1) and the bypass valve core (6). When the back pressure valve core (3) contacts the back pressure valve seat (2), the first bypass hole (10), the second bypass hole (8) and the third bypass hole (9) are coaxial.

3. The dual-control current stabilizing device according to claim 2, characterized in that, The bypass valve core (6) is a rotating part with an L-shaped cross-section. The bypass valve core (6) includes a moving part (601) and a sliding part (602). The second bypass hole (8) is provided on the sliding part (602). The sliding part (602) is in sliding contact with the bypass valve seat (11). The moving part (601) is in sliding contact with the inner wall of the main body (1). The end of the moving part (601) is provided with a limiting member for restricting the circumferential rotation of the bypass valve core (6).

4. The dual-control current stabilizing device according to claim 2, characterized in that, The bypass valve seat (11) is a rotating part with an L-shaped cross-section, and the first reset part (5) is located between the main body (1) and the bypass valve seat (11).

5. The dual-control current stabilizing device according to claim 1, characterized in that, Also includes: Valve stem (4) passes through water passage hole, one end of valve stem (4) is fixedly connected to back pressure valve core (3), and the other end of valve stem (4) is connected to bypass valve core (6).

6. The dual-control current stabilizing device according to claim 5, characterized in that, Also includes: The second reset member (7) is located between the bypass valve core (6) and the valve stem (4). The second reset member (7) is fixedly connected to the bypass valve core (6). The second reset member (7) is used to provide the valve stem (4) with a preload force in the direction of the back pressure valve seat (2).

7. The dual-control current stabilizing device according to claim 6, characterized in that, Both the first reset member (5) and the second reset member (7) are springs, and the elastic coefficient of the second reset member (7) is greater than that of the first reset member (5).

8. The dual-control current stabilizing device according to any one of claims 1-7, characterized in that, The back pressure valve core (3) has a frustum-shaped structure, and the back pressure valve seat (2) has a similar shape to the back pressure valve core (3).

9. The dual-control current stabilizing device according to any one of claims 1-7, characterized in that, Also includes: Anti-detachment cap (12), the anti-detachment cap (12) is located inside the body (1) on the side away from the back pressure valve seat (2), and the anti-detachment cap (12) is fixed in position with the body (1).

10. The dual-control current stabilizing device according to any one of claims 1-7, characterized in that, The main body (1) has several inclined surfaces for reducing flow resistance.

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