A single-line controlled hydraulic mechanical double-acting flow control valve

Abstract

This utility model relates to a single-pipeline controlled hydraulic-mechanical dual-action flow control valve, belonging to the technical field of oilfield downhole production flow control devices. It includes a housing assembly, a hydraulic assembly, a mandrel, a reset mechanism, a shearing assembly, an inner sleeve, a first inlet port, a second inlet port, a sealing assembly, a first sealing part, a second sealing part, and a hydraulic chamber. The housing assembly has a first inlet port on its side wall and houses the reset mechanism. One end of the inner sleeve is inserted into the reset mechanism, and the other end abuts against it. One end of the mandrel is inserted into the inner sleeve, and the two are connected by the shearing assembly. A second inlet port is opened on the side wall of the mandrel. The lower end of the hydraulic assembly is inserted into the other end of the mandrel, forming a hydraulic chamber with the housing. The sealing assembly includes a first sealing part and a second sealing part, located at both ends of the hydraulic chamber and in the gap between the housing and the mandrel, respectively. This tool structure not only effectively reduces the number of wellhead pipelines crossing and simplifies the wellhead structure, but also has multiple operating modes, offering a comprehensive advantage of high safety and convenient economy.

Description

Technical Field

[0001] This utility model relates to the technical field of flow control devices for oilfield downhole extraction, specifically to a hydraulic mechanical dual-action flow control valve with single-pipeline control. Background Technology

[0002] In current oil extraction processes, downhole flow control valves are crucial tools for operations such as stratified extraction, water injection, and well flushing. Both mechanical and hydraulic control valves commonly used in the industry have significant limitations. Hydraulic valves often require dual hydraulic lines for operation, which not only increases the complexity and number of wellhead pipelines but also raises operating costs and the risk of failure. On the other hand, hydraulic valves using a single line are susceptible to adverse effects from downhole hydrostatic pressure, making it difficult to independently drive the mandrel for precise opening and closing. Furthermore, traditional mechanical flow control valves rely entirely on wireline operations for each opening and closing, significantly increasing on-site operation time and labor costs, resulting in low efficiency. These inherent technical deficiencies collectively restrict the efficiency and economic benefits of well completion operations.

[0003] Therefore, how to provide a hydraulic mechanical dual-action flow control valve with single-line control to overcome the defects of the existing structure is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] To address these issues, this invention provides a hydraulic-mechanical dual-action flow control valve with single-pipeline control, which solves the problems in the prior art where hydraulic control valves require dual pipelines leading to wellhead complexity, single-pipeline valves are affected by hydrostatic pressure, and mechanical valves rely entirely on wireline operations, resulting in complex on-site operations, long operation times, high costs, and weak emergency response capabilities.

[0005] To achieve the above objectives, this utility model provides the following technical solution: This utility model discloses a single-line controlled hydraulic-mechanical dual-action flow control valve, comprising: The outer casing assembly has a first liquid inlet hole through its side wall, and a reset mechanism is inserted inside the outer casing assembly. The inner sleeve has one end inserted into the inside of the reset mechanism, and the other end of the inner sleeve abuts against the reset mechanism; The mandrel has one end inserted into the inner sleeve, and the mandrel is connected to the inner sleeve through a shearing assembly. A second liquid inlet hole is provided through the side wall of the mandrel. A hydraulic assembly is inserted at its lower end into the other end of the spindle, and a hydraulic chamber is provided between the hydraulic assembly and the housing assembly. The sealing assembly includes a first sealing part and a second sealing part, the first sealing part being disposed at both ends of the hydraulic chamber, and the second sealing part being disposed in the gap between the housing assembly and the spindle.

[0006] In one possible implementation, the mandrel includes: One end of the mandrel body is inserted into the inner sleeve, and the other end of the mandrel body is sleeved on the outside of the hydraulic assembly; The limiting boss is integrally formed on the outer wall of the mandrel body; Positioning grooves are arranged in pairs and are formed on the inner walls at both ends of the mandrel body.

[0007] In one possible implementation, the housing assembly includes: The upper connector has its lower end threadedly connected to the upper end of the middle connector. The liquid inlet connector has a threaded connection at its upper end to the lower end of the middle connector, and sealing grooves are provided on the inner walls of both ends of the liquid inlet connector. The upper end of the outer sleeve is threadedly connected to the lower end of the liquid inlet connector, and the lower end of the outer sleeve is threadedly connected to the lower connector. The reset mechanism is inserted inside the outer casing, and the lower end of the reset mechanism is connected to the top of the lower connector; The first liquid inlet hole is formed on the liquid inlet connector.

[0008] In one possible implementation, the upper connector includes: The upper connector housing has an integrally formed positioning step on its inner wall, and a pipeline interface is provided on the outer wall of the upper connector housing. An infusion line is provided inside the upper connector housing. One end of the infusion line is connected to the line interface, and the other end of the infusion line is connected to the hydraulic chamber. A perforated groove is provided on the inner wall of the upper connector housing, and the perforated groove is located inside the pipeline interface.

[0009] In one possible implementation, the hydraulic assembly includes a hydraulic plug and a protrusion, the lower end of the hydraulic plug being inserted into the inner hole of the mandrel, and the outer side of the hydraulic plug being integrally formed with a protrusion, the protrusions being arranged in pairs.

[0010] In one possible implementation, the reset mechanism includes a rotating disk and a reset member. The rotating disk is disposed in the annular gap between the inner wall of the outer sleeve and the outer wall of the inner sleeve. The rotating disk is disposed at the top of the lower connector, and the top of the rotating disk is connected to the reset member.

[0011] In one possible implementation, the first sealing portion includes: The first retaining ring is provided in pairs and is detachably connected to the outside of the hydraulic plug; A first seal, arranged in pairs, is disposed on the outside of the hydraulic plug, and the first seal is disposed in the gap between the first retaining ring and the protrusion.

[0012] In one possible implementation, the second sealing portion includes: The second sealing element is provided in pairs and is inserted into the sealing groove of the liquid inlet connector; A sealing retaining ring is disposed in the gap between the inner wall of the liquid inlet connector and the outer wall of the mandrel. The sealing retaining ring is threadedly connected to the inner wall of the liquid inlet connector, and a limiting groove is formed in the inner wall of the sealing retaining ring.

[0013] This utility model has the following advantages: By employing a single-line control system and a dual-action design combining hydraulic and mechanical components, the system simplifies the wellhead structure and reduces installation and manufacturing costs while providing dual operational assurance through hydraulic main control and mechanical backup, thus enhancing the reliability of downhole control. When operating the mandrel independently, the locking structure of the sealing ring and the emergency pressure relief channel at the upper connector effectively prevent accidental valve opening, ensuring production safety. The equipped multi-level emergency response plan can handle various faults through conventional wireline operations, avoiding costly well workover operations and significantly reducing maintenance costs. Simultaneously, the reset mechanism eliminates spring torsional stress, extending the service life of core components and comprehensively improving the overall performance and operating cycle of the control valve. Attached Figure Description

[0014] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0015] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0016] Figure 1 A cross-sectional view of a single-line controlled hydraulic mechanical double-acting flow control valve provided for this utility model; Figure 2 A cross-sectional view of the housing assembly provided for this utility model; Figure 3Cross-sectional view of the upper connector provided by this utility model Figure 4 Cross-sectional view of the hydraulic component provided by this utility model; Figure 5 A cross-sectional view of the reset mechanism provided by this utility model; Figure 6 A cross-sectional view of the sealing assembly provided by this utility model; Figure 7 Cross-sectional view of the mandrel and limiting boss provided by this utility model; Figure 8 Provided by this utility model Figure 7 Enlarged view of a portion of point A in the middle; Figure 9 A cross-sectional view of the sealing ring provided by this utility model; Figure 10 A cross-sectional view of the mandrel provided for this utility model; Figure 11 Provided by this utility model Figure 10 Enlarged view of a section at point B in the middle; Figure 12 A schematic diagram illustrating the hydraulic control closed and open states of the control valve provided by this utility model; Figure 13 A schematic diagram illustrating the mechanical control closed and open states of the control valve provided by this utility model; Figure 14 Provided by this utility model Figure 13 Enlarged view of a section at point C; In the figure: 1. Outer shell assembly; 11. Upper connector; 111. Infusion line; 112. Positioning step; 113. Line interface; 114. Upper connector housing; 115. Perforated groove; 12. Middle connector; 13. Inlet connector; 14. Outer jacket; 15. Lower connector; 2. Hydraulic assembly; 21. Hydraulic plug; 22. Protrusion; 3. Mandrel; 31. Limiting boss; 32. Mandrel body; 33. Positioning groove; 4. Reset mechanism; 41. Reset component; 42. Rotating disk; 5. Shearing assembly; 6. Inner sleeve; 7. First inlet hole; 8. Second inlet hole; 9. Sealing assembly; 91. First sealing part; 911. First retaining ring; 912. First sealing element; 92. Second sealing part; 921. Second sealing element; 922. Sealing retaining ring; 923. Limiting groove. Detailed Implementation

[0017] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] Please refer to Figures 1-14 The present invention discloses a single-line controlled hydraulic mechanical double-acting flow control valve, such as... Figure 1 , Figure 12 and Figure 13 The assembly includes a housing assembly 1, a hydraulic assembly 2, a spindle 3, a reset mechanism 4, a shearing assembly 5, an inner sleeve 6, a first inlet hole 7, a second inlet hole 8, a sealing assembly 9, a first sealing part 91, a second sealing part 92, and a hydraulic chamber. The housing assembly 1 has a first inlet hole 7 through its side wall. The reset mechanism 4 is inserted into the housing assembly 1. One end of the inner sleeve 6 is inserted into the reset mechanism 4, and the other end of the inner sleeve 6 abuts against the reset mechanism 4. One end of the spindle 3 is inserted into the inner sleeve 6. The spindle 3 and the inner sleeve 6 are connected by the shearing assembly 5. The second inlet hole 8 is through its side wall. The lower end of the hydraulic assembly 2 is inserted into the other end of the spindle 3. A hydraulic chamber is provided between the hydraulic assembly 2 and the housing assembly 1. The sealing assembly 9 includes a first sealing part 91 and a second sealing part 92. The first sealing part 91 is provided at both ends of the hydraulic chamber, and the second sealing part 92 is provided in the gap between the housing assembly 1 and the spindle 3.

[0019] The housing assembly 1 provides structural support for the control valve and establishes a fluid passage.

[0020] Hydraulic component 2 is responsible for receiving the hydraulic pressure from the single pipeline and converting such pressure into axial thrust, driving the spindle 3 to move axially.

[0021] The mandrel 3 serves as a valve core that controls the opening or closing of the flow. By changing the relative positions of the second inlet hole 8 on the mandrel 3 and the first inlet hole 7 on the inlet connector 13, the opening or closing of the fluid channel can be controlled, thereby achieving flow regulation.

[0022] The reset mechanism 4 is responsible for providing the axial thrust to close the valve after hydraulic pressure is released. The rotating disk 42 inside the reset mechanism 4 can eliminate the torsional friction that the reset element 41 (preferably the reset spring) may experience during compression and release, converting it into pure axial movement, thereby protecting the reset element 41 from torsional stress and preventing it from failing due to fatigue.

[0023] The function of the inner sleeve 6 is to transmit the force of the reset mechanism 4 to the spindle 3 under normal working conditions.

[0024] The function of the shearing assembly 5 is to fix the mandrel 3 and the inner sleeve 6 under normal working conditions. Under abnormal conditions, it can be released by shearing in an emergency, thereby allowing the mandrel 3 to be operated independently by wire mesh, thus providing a structural basis for mechanical motion flow control. The shearing assembly 5 is preferably a shearing pin, shearing ring, etc.

[0025] The first sealing part 91 of the sealing assembly 9 forms a sealing interface between the hydraulic assembly 2 and the housing assembly 1; the second sealing part 92 forms a sealing interface at the gap between the housing assembly 1 and the spindle 3, etc., ensuring the independence and sealing of the pressure chamber, thereby ensuring the safe operation of the control valve in the complex environment downhole.

[0026] The usage process of this utility model embodiment is as follows: Normal hydraulic control operation ( Figure 12 (D indicates the hydraulic shutdown state, and E indicates the hydraulic open state) The ground pump pressure equipment delivers hydraulic pressure to the hydraulic control line connected to the pipeline interface 113. The hydraulic pressure is transmitted from the pipeline interface to the hydraulic chamber. The pressure acts on the hydraulic plug 21, generating a downward axial thrust. This thrust pushes the mandrel 3 (which is fixedly connected to the inner sleeve 6 via the shear assembly 5) and the compression reset mechanism 41, moving them downwards together. When the second inlet hole 8 on the mandrel aligns with the first inlet hole 7 on the inlet connector, the oil-sleeve connection channel opens, and the valve is in the open state. When it is necessary to close the valve, the ground equipment depressurizes, the elastic potential energy stored in the reset mechanism 4 is released, pushing the inner sleeve 6 and the mandrel 3 upwards together, causing the inlet and outlet holes to be misaligned, thereby cutting off the oil-sleeve connection and closing the valve.

[0027] Mechanical backup operation after hydraulic control failure ( Figure 13 (F indicates the mechanical is off, G indicates the mechanical is on) When the hydraulic control system fails, such as due to pipeline blockage, leakage, or reset device failure, causing the valve to malfunction, a mechanical emergency operation is initiated. A puncture tool is lowered using a wireline. After lowering, the tool is positioned by the positioning step 112 of the upper connector 11. The puncture tool punctures the perforation groove 115, connecting the pipeline interface 113 to the internal passage of the control valve, thereby releasing the hydraulic pressure. The puncture tool is removed, and a displacement tool is lowered again. The displacement tool is positioned by the positioning groove at the upper or lower end of the mandrel 3. When the displacement tool is positioned at the upper groove, pulling it upwards closes the valve; conversely, moving it downwards opens the valve. After releasing the shearing assembly 5 using the displacement tool, the mandrel 3 disengages from the inner sleeve 6, becoming an independently movable component. By using a ground-based wire lifting and lowering tool (shifting tool), the mandrel 3 can be directly and individually moved up and down: adjust the mandrel 3 to align the inlet and outlet holes to open the valve; when it is necessary to close the control valve, lift the mandrel 3 so that its limiting boss engages in the groove 923 of the sealing ring 922, preventing it from moving down easily, thereby stabilizing the valve in the closed position and preventing accidental opening.

[0028] Emergency procedures in case of failure of reset mechanism 4: If the reset mechanism 4 fails, causing the valve to fail to close, and no mechanical backup operation is required, a puncture tool can be lowered. The tool punctures the perforation groove 115 of the upper connector 11, connecting the hydraulic control line 111 to the internal oil pipe, establishing a temporary fluid channel, and preventing the spindle 3 from malfunctioning under residual fluid pressure.

[0029] Final Fault Isolation Operation: If the valve itself suffers a serious mechanical failure, such as jamming, and cannot be repaired by the above methods, and affects the production of other stages, then a sealing tool should be installed.

[0030] The sealing tool is set at the positioning step 112 of the upper connector to form a barrier, thereby isolating the faulty control valve and its corresponding production section, thus ensuring that other sections in the wellbore can resume normal production.

[0031] In a specific embodiment, such as Figure 2 and Figure 3 The mandrel 3 includes a limiting boss 31, a mandrel body 32 and a positioning groove 33. One end of the mandrel body 32 is inserted into the inner sleeve 6, and the other end of the mandrel body 32 is sleeved on the outside of the hydraulic component 2. The limiting boss 31 is integrally formed on the outer wall of the mandrel body 32, and the positioning groove 33 is arranged in pairs and opened on the inner walls of both ends of the mandrel body 32.

[0032] The spindle body 32 functions to control the opening and closing of the fluid channel: multiple strip-shaped holes (i.e., second inlet holes 8) on the outer circumference of the spindle body directly connect or disconnect the control valve by aligning or misaligning with the first inlet hole 7 on the inlet connector 13. Simultaneously, it also serves as the transmitter of all forces (hydraulic thrust, reset spring force, and wire rope lifting force).

[0033] Positioning grooves 33 are arranged in pairs on the inner walls of both ends of the main body of the mandrel 3, serving as the mechanical interface for the wire rope operation displacement tool. When the hydraulic control system fails, the lowered wire rope operation tool (displacement tool) can be inserted into the positioning grooves 33 to establish a connection with the mandrel 3, thereby enabling direct lifting or pressing of the mandrel 3 and completing the mechanical opening or closing operation of the control valve.

[0034] The limiting boss 31 is integrally formed on the outer wall of the mandrel body, and its function is to lock the mechanically closed position and prevent accidental opening. During mechanical backup operation, when it is necessary to close the valve, the mandrel 3 is lifted by the shifting tool, so that the limiting boss 31 finally engages with the limiting groove 923 on the sealing ring 922 inside the fluid inlet connector 13, forming a locking structure. This design can prevent the mandrel from accidentally moving down due to downhole vibration or residual pressure, thereby safely locking the control valve in the closed state.

[0035] In a specific embodiment, such as Figure 4 The outer casing assembly 1 includes an upper connector 11, a middle connector 12, a liquid inlet connector 13, an outer casing 14, and a lower connector 15. The lower end of the upper connector 11 is threadedly connected to the upper end of the middle connector 12. The upper end of the liquid inlet connector 13 is threadedly connected to the lower end of the middle connector 12. Sealing grooves are provided on the inner walls of both ends of the liquid inlet connector 13. The upper end of the outer casing 14 is threadedly connected to the lower end of the liquid inlet connector 13. The lower end of the outer casing 14 is threadedly connected to the lower connector 15. The reset mechanism 4 is inserted inside the outer casing 14. The lower end of the reset mechanism 4 is connected to the top of the lower connector 15. The first liquid inlet hole 8 is opened on the liquid inlet connector 13.

[0036] The upper connector 11 serves as the inlet, with a hydraulic control line installed on its outer side. The hydraulic control line connects to the line interface 113 to introduce hydraulic fluid into the hydraulic chamber. The middle connector 12 connects and seals the upper connector 11 and the inlet connector 13. A strip-shaped hole (i.e., the first inlet hole 7) is formed on the side wall of the inlet connector 13. The inlet connector 13 slides with the spindle, allowing the control valve to open and close the fluid passage. The outer casing 14 houses and protects the internal reset mechanism 4. The lower connector 15 at the end is installed at the bottom of the outer casing 14, forming the control valve housing together with the other four components.

[0037] In a specific embodiment, such as Figure 5 The upper connector 11 is provided with an infusion line 111, a positioning step 112, a line interface 113, an upper connector housing 114, and a perforation groove 115. The positioning step 112 is integrally formed on the inner wall of the upper connector housing 114, and the line interface 113 is opened on the outer wall of the upper connector housing 114. The infusion line 111 is opened inside the upper connector housing 114. One end of the infusion line 111 is connected to the line interface 113, and the other end of the infusion line 111 is connected to the hydraulic chamber. The perforation groove 115 is provided on the inner wall of the upper connector housing 114 and is located inside the line interface 113.

[0038] The upper connector 11 has a pipeline interface 113 on its pipe wall, and a fluid delivery pipeline 111 is machined inside it. In hydraulic operation mode, the external hydraulic control pipeline is connected to the pipeline interface 113. The flow path of the hydraulic oil is as follows: starting from the surface equipment, through the hydraulic control pipeline, the pipeline interface 113, and the fluid delivery pipeline 111, and finally acting on the hydraulic chamber. Because sealing components 9 are installed at both ends of the hydraulic chamber, the hydraulic fluid generates a pressure difference in the hydraulic chamber. The pressure difference pushes the mandrel 3 to move in the opening direction, thereby opening the valve. This design simplifies wellhead configuration and reduces costs.

[0039] The perforated groove 115 is a specially designed structurally weak groove inside the upper connector 11, serving as a pressure safety control structure in case of hydraulic system failure. When the valve reset device 4 fails, causing the spindle 3 to fail to close properly, this groove can be punctured by inserting a special puncture tool. This connects the hydraulic control channel to the inside of the control valve, thus forming an emergency pressure relief channel. Subsequently, even if the hydraulic control line is pressurized by ground operation, the pressure will be released through this hole, preventing the hydraulic plug 21 and spindle 3 from moving.

[0040] Positioning step 112 provides a location for the penetration and plugging tools, achieving structural isolation of the faulty valve. Control valves are typically used in stratified oilfields, with multiple valves installed in a single wellbore to control different strata. When one of the flow control valves malfunctions, for example, if it gets stuck in the open position and cannot close, it interferes with the effective control of that stratum and may affect production in other healthy strata. In this case, instead of an expensive wellworkout, a plugging tool, similar to a bridge plug, can be run. The role of positioning step 112 is to provide a location for this penetration and plugging tool. When the plugging tool is placed at step 112, it will be stuck and set, forming a barrier that isolates the faulty control valve below and its corresponding stratum.

[0041] In a specific embodiment, such as Figure 6 The hydraulic component 2 includes a hydraulic plug 21 and a protrusion 22. The lower end of the hydraulic plug 21 is inserted into the inner hole of the spindle 3. The outer side of the hydraulic plug 21 is integrally formed with a protrusion 22, and the protrusions 22 are arranged in pairs.

[0042] Hydraulic plug 21 converts hydraulic pressure into axial thrust, serving as the component that bears the hydraulic force. When ground equipment pressurizes the pipeline, the pressure acts on the first seal 91 and hydraulic plug 21, generating an axial thrust. This thrust is transmitted to the spindle 3 through hydraulic plug 21, driving the spindle 3 to move and opening the valve when the first inlet hole 7 and the second inlet hole 8 align. The lower end of hydraulic plug 21 is inserted into the inner hole of spindle 3, the diameter of which is stepped, so that when hydraulic plug 21 moves to the set position, it can push the spindle 3. This design ensures the transmission of hydraulic thrust and provides good guidance and support for the movement of spindle 3, ensuring that spindle 3 moves along the axis. Protrusion 22 cooperates with a removable retaining ring to form a groove on the outer wall of hydraulic plug 21 to prevent the seal from being fixed. The seal forms a tight sealing interface through an interference fit.

[0043] In a specific embodiment, such as Figure 7The reset mechanism 4 includes a rotating disk 42 and a reset member 41. The rotating disk 42 is disposed in the annular gap between the inner wall of the outer sleeve 14 and the outer wall of the inner sleeve 6. The rotating disk 42 is disposed on the top of the lower connector 15. The top of the rotating disk 42 is connected to the reset member 41. The reset member 41 is also disposed in the annular gap between the inner wall of the outer sleeve 14 and the outer wall of the inner sleeve 6.

[0044] The reset element 41 (preferably a mechanical spring) provides power for the closing of the control valve. Its function is to provide a continuous thrust, which can push the inner sleeve 6 to move when the hydraulic pressure is released. The inner sleeve 6 pushes the spindle 3 to reset to the closed position.

[0045] The rotating disk 42 is provided to ensure that the reset component 41 can function stably. It is usually located between the reset component 41 and the bottom bearing component (lower connector 15). Its function is to convert the radial or torsional force borne by the reset component 41 during movement into the thrust of axial movement, thereby protecting the reset spring from torsional load, reducing the probability of fatigue failure, and improving the reliability of the entire reset mechanism 4 in harsh downhole environments.

[0046] In a specific embodiment, such as Figure 8 The first sealing part (91) includes a first retaining ring 911 and a first sealing member 912. The first retaining ring 911 is arranged in pairs and is detachably connected to the outside of the hydraulic plug 21. The first sealing member 912 is arranged in pairs and is disposed on the outside of the hydraulic plug 21. The first sealing member 912 is disposed in the gap between the first retaining ring 911 and the protrusion 22.

[0047] The first sealing part 91 bears the pressure of the hydraulic control line to prevent hydraulic leakage. The first sealing element 912 is the sealing body, responsible for sealing both ends of the annular gap between the hydraulic plug 21 and the inner hole of the upper connector 11, so as to form a hydraulic cavity with good sealing performance. The paired first retaining rings 91 serve as a support structure, and together with the protrusions 22 on the hydraulic plug 21, they clamp and fix the first sealing element 92 to prevent the first sealing element 92 from being squeezed out or displaced under hydraulic pressure.

[0048] In a specific embodiment, such as Figure 8 The second sealing part (92) includes a second sealing element 921, a sealing ring 922 and a groove 923. The second sealing elements 921 are arranged in pairs and inserted into the sealing groove of the liquid inlet connector 13. The sealing ring 922 is disposed in the gap between the inner wall of the liquid inlet connector 13 and the outer wall of the spindle 3. The sealing ring 922 is threadedly connected to the inner wall of the liquid inlet connector 13. A limiting groove 923 is formed on the inner wall of the sealing ring 922.

[0049] The second seal 921 is arranged in the sealing grooves at both ends of the liquid inlet connector 13. Its function is to seal the gap between the inner wall of the liquid inlet connector 13 and the outer wall of the mandrel 3, ensuring that the fluid passing through the first liquid inlet hole 7 and the second liquid inlet hole 8 is controlled by the movement of the mandrel 3 and will not leak to other locations. The sealing retaining ring 922 is fastened to the inner wall of the liquid inlet connector 13 by threads. The groove 923 opened on its inner wall cooperates with the limiting boss 31 on the mandrel 3, forming a structure to prevent the mandrel 3 from being opened accidentally during mechanical emergency operation.

[0050] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A hydraulic-mechanical dual-acting flow control valve with single-line control, characterized in that, include: The outer casing assembly (1) has a first liquid inlet hole (7) through the side wall, and a reset mechanism (4) is inserted inside the outer casing assembly (1). The inner sleeve (6) has one end inserted into the inside of the reset mechanism (4), and the other end of the inner sleeve (6) abuts against the reset mechanism (4); The mandrel (3) is inserted into the inner sleeve (6) at one end. The mandrel (3) and the inner sleeve (6) are connected by a shearing assembly (5). A second liquid inlet hole (8) is provided through the side wall of the mandrel (3). The lower end of the hydraulic assembly (2) is inserted into the other end of the spindle (3), and a hydraulic cavity is provided between the hydraulic assembly (2) and the outer shell assembly (1); The sealing assembly (9) includes a first sealing part (91) and a second sealing part (92). The first sealing part (91) is disposed at both ends of the hydraulic chamber, and the second sealing part (92) is disposed in the gap between the housing assembly (1) and the spindle (3).

2. The single-line controlled hydraulic-mechanical dual-acting flow control valve as described in claim 1, characterized in that, The mandrel (3) includes: The spindle body (32) has one end inserted into the inner sleeve (6) and the other end sleeved on the outside of the hydraulic assembly (2); The limiting boss (31) is integrally formed on the outer wall of the mandrel body (32); Positioning grooves (33) are arranged in pairs and are formed on the inner walls of both ends of the spindle body (32).

3. The single-line controlled hydraulic-mechanical dual-acting flow control valve as described in claim 2, characterized in that, The housing assembly (1) includes: The upper connector (11) is threaded to the upper end of the middle connector (12); The liquid inlet connector (13) is threaded at the upper end to the lower end of the middle connector (12), and sealing grooves are provided on the inner walls of both ends of the liquid inlet connector (13); The upper end of the outer sleeve (14) is threaded to the lower end of the liquid inlet connector (13), and the lower end of the outer sleeve (14) is threaded to the lower connector (15). The reset mechanism (4) is inserted inside the outer sleeve (14), and the lower end of the reset mechanism (4) is connected to the top of the lower connector (15); The first liquid inlet (7) is opened on the liquid inlet connector (13).

4. The single-line controlled hydraulic-mechanical dual-acting flow control valve as described in claim 3, characterized in that, The upper connector (11) includes: The upper connector housing (114) has an integrally formed positioning step (112) on its inner wall, and a pipeline interface (113) is provided on the outer wall of the upper connector housing (114). An infusion line (111) is provided inside the upper connector housing (114). One end of the infusion line (111) is connected to the line interface (113), and the other end of the infusion line (111) is connected to the hydraulic chamber. A perforated groove (115) is provided on the inner wall of the upper connector housing (114), and the perforated groove (115) is provided on the inner side of the pipeline interface (113).

5. The single-line controlled hydraulic-mechanical dual-acting flow control valve as described in claim 3, characterized in that, The hydraulic assembly (2) includes a hydraulic plug (21) and a protrusion (22). The lower end of the hydraulic plug (21) is inserted into the inner hole of the mandrel (3). The outer side of the hydraulic plug (21) is integrally formed with a protrusion (22), and the protrusions (22) are arranged in pairs.

6. The single-line controlled hydraulic-mechanical dual-acting flow control valve as described in claim 3, characterized in that, The reset mechanism (4) includes a rotating disk (42) and a reset component (41). The rotating disk (42) is disposed in the annular gap between the inner wall of the outer sleeve (14) and the outer wall of the inner sleeve (6). The rotating disk (42) is disposed on the top of the lower connector (15). The top of the rotating disk (42) is connected to the reset component (41).

7. The single-line controlled hydraulic-mechanical dual-acting flow control valve as described in claim 5, characterized in that, The first sealing part (91) includes: The first retaining ring (911) is provided in pairs and is detachably connected to the outside of the hydraulic plug (21); The first seal (912) is provided in pairs and is located on the outside of the hydraulic plug (21). The first seal (912) is located in the gap between the first retaining ring (911) and the protrusion (22).

8. The single-line controlled hydraulic-mechanical dual-acting flow control valve as described in claim 3, characterized in that, The second sealing part (92) includes: The second seal (921) is provided in pairs and is inserted into the sealing groove of the liquid inlet connector (13); A sealing ring (922) is provided in the gap between the inner wall of the liquid inlet connector (13) and the outer wall of the mandrel (3). The sealing ring (922) is threadedly connected to the inner wall of the liquid inlet connector (13). A limiting groove (923) is provided on the inner wall of the sealing ring (922).

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