Hydraulic mechanism for controlling fluid flow in pipeline

Abstract

The utility model relates to the technical field of pipeline flow control, in particular to a hydraulic mechanism used for controlling the flow of fluid in a pipeline, the hydraulic mechanism is arranged in the pipeline, the hydraulic mechanism comprises a hydraulic assembly, and the hydraulic assembly comprises a piston rod capable of moving in the axial direction of the pipeline; the cone valve body is connected to the piston rod; the valve body seat is arranged on the inner side wall of the pipeline, and the circulating surface can be in linear contact with the cone valve body; and the displacement sensor is connected with the piston rod and used for monitoring the progress of the piston rod. The line contact relation between the cone valve body and the valve body seat is controlled through the hydraulic assembly, and the flow of fluid in a pipeline is controlled; through the combination of the displacement sensor and the hydraulic assembly, the flow control precision can be improved; the hydraulic assembly is arranged in the pipeline, so that the occupied space of the flow control structure can be effectively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of pipeline flow control, and in particular to a hydraulic mechanism for controlling the flow of a fluid in a pipeline. Background Art

[0002] Nowadays, with the continuous development of the economy, pipeline transportation, as an important mode of fluid transportation, has been widely used in all walks of life. The popularization of pipeline transportation also means that more diversified methods of controlling the fluid flow in the pipeline are needed to control the fluid transportation inside the pipeline.

[0003] At present, the commonly used methods of controlling flow in pipeline transportation include control through mechanical structures: such as ordinary valve control, pump control, flow meter control, etc. These mechanical structures for flow control still have the following shortcomings that need to be solved: 1. Control the internal flow of the pipeline through the mechanical structure. On the one hand, if the mechanical structure is to be servo-controlled, it is necessary to use components such as servo motors. The servo motor needs to be installed on the outside of the pipeline, which will increase the space occupied by the pipeline. The space occupied by the entire structure will be relatively large. For small pipelines, this structure cannot be installed. On the other hand, after long-term operation of the mechanical structure, the sliding surfaces that contact each other will wear more, which will affect the stability and safety of the mechanical structure; 2. The force density of the mechanical structure is small. For the same output force, the installation space of the hydraulic cylinder will be smaller than that of the mechanical structure; 3. Another disadvantage of the mechanical structure is that it is not stable enough. When the fluid in the pipeline is impacted, the mechanical structure may deviate, affecting the control accuracy. Utility Model Content

[0004] The technical problem to be solved by the utility model is that the existing mechanical structure for controlling the flow in a pipeline occupies a large space and has poor control accuracy.

[0005] To this end, the utility model provides a hydraulic mechanism for controlling the flow rate of a fluid in a pipeline.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A hydraulic mechanism for controlling the flow of a fluid in a pipeline, wherein the hydraulic mechanism is arranged in the pipeline and comprises:

[0008] A hydraulic assembly, the hydraulic assembly comprising a piston rod capable of moving axially along the pipeline;

[0009] A cone valve body connected to the piston rod;

[0010] A valve body seat, wherein the valve body seat is arranged on the inner wall of the pipeline, and the flow surface can form a line contact with the cone valve body;

[0011] A displacement sensor is connected to the piston rod and is used to monitor the progress of the piston rod.

[0012] By adopting the above technical solution, the cone valve body is extended out through the piston rod so that the cone valve body moves toward the valve body seat, and the flow rate of the fluid in the pipeline is controlled by the line contact between the cone valve body and the valve body seat. The hydraulic component is arranged inside the pipeline, eliminating the need to arrange a control valve and a servo motor outside the pipeline, which can effectively reduce the occupied space of the flow control structure, thereby reducing the occupied space of the entire pipeline, and the hydraulic component operates smoothly. The hydraulic component is used in conjunction with a displacement sensor, and the displacement sensor can provide real-time feedback on the progress of the piston rod and the cone valve body, thereby facilitating the user to control the opening and improving the flow control accuracy.

[0013] Furthermore, a flow surface is provided on the valve body seat, the flow surface is inclined toward the piston rod, and an angle exists between the flow surface and the conical surface on the conical valve body.

[0014] By adopting the above technical solution, the line contact setting enables an angle to exist between the flow surface and the conical surface on the conical valve body, thereby reducing the processing accuracy of the conical valve body and the valve body seat, and the sealing effect of the line contact is better.

[0015] Furthermore, a transition surface is provided on the valve body seat, the transition surface is inclined in a direction away from the cylinder bottom, and the transition surface is provided on a side of the flow surface away from the piston rod.

[0016] Furthermore, the pipeline includes three coaxially arranged pipeline parts, namely a first pipeline part, a second pipeline part, and a third pipeline part.

[0017] Furthermore, the hydraulic assembly and the cone valve body are arranged in the second pipeline part, the valve body seat is arranged on the inner side wall of the second pipeline part, and the second pipeline part includes a plurality of coaxially arranged pipe fittings.

[0018] Furthermore, a transition plate is sealedly connected between the second pipeline portion and the third pipeline portion, and a waist-shaped opening is also provided on the transition plate. A guide rod is connected to the cone valve body, and the guide rod passes through the transition plate.

[0019] By adopting the above technical solution, the guide rod guides the cone valve body to prevent the piston rod from bending due to the weight of the cone valve body after the piston rod is fully extended, and the piston rod from drawing after long-term operation.

[0020] Furthermore, the hydraulic assembly also includes a cylinder bottom, a cylinder barrel and a guide sleeve, the cylinder barrel is connected between the cylinder bottom and the guide sleeve, the piston rod is movably connected to the cylinder barrel along the axial direction of the cylinder barrel, and the piston rod passes through the guide sleeve.

[0021] Furthermore, two sealing rings are arranged on the inner wall of the guide sleeve along the axial direction of the piston rod, and an annular groove is arranged at one end of the sealing ring. The groove on the sealing ring arranged close to the cylinder bottom of the two sealing rings is located at the end of the sealing ring facing the cylinder bottom, and the groove on the sealing ring arranged away from the cylinder bottom is located at the end of the sealing ring away from the cylinder bottom.

[0022] By adopting the above technical solution, a structure in which the openings of the two sealing rings are opposite to each other is adopted, and the sealing ring with the opening far away from the bottom of the cylinder is arranged, which can effectively reduce friction while bearing pressure.

[0023] Furthermore, a rodless chamber oil hole and a rod chamber oil hole are provided on the cylinder bottom, an oil through hole is provided in the wall thickness of the cylinder barrel, the rod chamber oil hole is connected to the oil through hole, the cylinder bottom is sealed and connected between the second pipeline part and the first pipeline part, the displacement sensor is arranged between the cylinder bottom and the piston rod, and a waist-shaped opening is provided on the cylinder bottom.

[0024] Furthermore, a mounting area and a circulation area are provided on the cylinder bottom, the circulation area is coaxially arranged outside the mounting area, a mounting groove for installing a displacement sensor is provided on the mounting area, and the waist-shaped opening is provided on the circulation area.

[0025] Furthermore, a boss is arranged on the installation area on the cylinder bottom, the installation groove is arranged on the boss, and the cylinder barrel is sleeved on the boss and is sealed and connected with the boss.

[0026] Furthermore, a fixing hole is provided on the side wall of the cylinder bottom, a screw is threadedly connected to the cylinder bottom through the fixing hole, a steel ball is provided between the screw and the displacement sensor, the diameter of the steel ball is smaller than the inner diameter of the fixing hole, and an embedding groove is provided on the side wall of the side head part of the displacement sensor, and the steel ball is located in the embedding groove.

[0027] Furthermore, the side wall of the embedding groove away from the piston rod is inclined toward a direction away from the piston rod.

[0028] By adopting the above technical solution, when the steel ball needs to be disassembled, the displacement sensor is pulled out, and the steel ball can enter the fixing hole under the push of the inclined surface on the embedding groove.

[0029] The beneficial effect of the utility model is that the application adopts the combination of hydraulic components and cone valve body for flow control, which can reduce the wear of structural parts, has a long service life, and has a strong bearing capacity. With the use of displacement sensors, the displacement sensors can provide real-time feedback on the progress of the piston rod and the cone valve body, so that the opening in the pipe can be accurately controlled, the flow in the pipeline can be accurately controlled, and the flow control action is smooth. Furthermore, compared with mechanical structures (valves, servo motors, etc.), the hydraulic components are arranged in the pipeline, and there is no need to occupy the space outside the pipeline, so that the space occupied by the flow control structure can be effectively reduced, thereby reducing the space occupied by the pipeline as a whole.

[0030] The pipeline is arranged in sections, and in particular, the second pipeline portion in the built-in area of ​​the hydraulic component is preferably arranged in sections, which facilitates the subsequent maintenance of the hydraulic component and the cone valve body and other parts.

[0031] In the sealing of the hydraulic component, sealing structures are arranged between the piston part of the piston rod and between the piston rod and the guide sleeve. In particular, between the piston rod and the guide sleeve, a structure with two sealing rings with opposite openings is adopted. The sealing ring with the opening away from the bottom of the cylinder can effectively reduce friction while bearing pressure. A thicker sealing ring is arranged to improve the pressure resistance of the sealing ring, thereby effectively isolating the hydraulic component from the fluid in the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0033] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0034] Figure 2 It is a structural schematic diagram of the positional relationship between the hydraulic components and the pipeline in the utility model.

[0035] Figure 3 It is used to reflect Figure 2 A-part enlarged view of the installation relationship between the displacement sensor and the cylinder bottom.

[0036] Figure 4 It is used to reflect Figure 2 Enlarged view of part B showing the installation relationship between the piston rod and the guide sleeve.

[0037] In the figure: 1, pipeline; 10, first pipeline section; 101, first pipe fitting; 11, second pipeline section; 111, second pipe fitting; 112, third pipe fitting; 12, third pipeline section; 121, fourth pipe fitting; 2, hydraulic assembly; 20, cylinder bottom; 201, boss; 202, connecting groove; 203, waist-shaped opening; 204, mounting groove; 205, fixing hole; 206, screw; 207, steel ball; 208, rod cavity oil hole ; 209, rodless chamber oil hole; 21, cylinder barrel; 211, oil through hole; 22, piston rod; 221, sealing ring; 222, guide ring; 223, sealing ring; 23, guide sleeve; 24, connecting plate; 3, displacement sensor; 30, embedded groove; 4, cone valve body; 5, guide rod; 50, limit plate; 6, flange plate; 7, sleeve; 70, valve body seat; 71, flow surface; 72, transition surface; 8, transition plate; 9, servo valve. DETAILED DESCRIPTION

[0038] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0039] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Reference Figure 1-4A hydraulic mechanism for controlling the flow of a fluid in a pipeline comprises a pipeline 1, a hydraulic component 2, a displacement sensor 3 and a cone valve body 4.

[0042] The hydraulic assembly 2 includes a cylinder bottom 20, a cylinder barrel 21, a piston rod 22 and a guide sleeve 23. The cylinder barrel 21 is connected to the cylinder bottom 20 by a screw 206. A boss 201 is provided on the cylinder bottom 20. A connecting groove 202 is provided on the side wall of the boss 201. A static sealing structure is provided in the connecting groove 202. The cylinder barrel 21 is sleeved on the boss 201. The cylinder barrel 21 and the boss 201 are sealed and connected. The guide sleeve 23 is threadedly connected to the end of the cylinder barrel 21 away from the cylinder bottom 20. The piston rod 22 is coaxially inserted in the cylinder barrel 21. The piston rod 22 passes through the guide sleeve 23. The piston rod 22 moves along the axial direction of the cylinder barrel 21. An oil hole 211 is designed in the wall of the cylinder barrel 21 to allow the oil path of the rod chamber to pass to the rod chamber side.

[0043] A guide rod 5 is connected to the cone valve body 4, and the cone valve body 4 is coaxially fixedly connected to one end of the piston rod 22 passing through the guide sleeve 23 through a connecting plate 24. The connecting plate 24 is connected to the end of the piston rod 22 and the cone valve body 4 through screws 206. The end faces of the connecting plate 24 facing the piston rod 22 and the cone valve body 4 are provided with positioning convex surfaces to position the piston rod 22 and the cone valve body 4.

[0044] A through hole for installing the guide rod 5 is coaxially arranged on the cone valve body 4, and a limiting groove connected to the through hole is arranged at one end of the cone valve body 4 close to the connecting plate 24. The guide rod 5 passes through the through hole, and a limiting plate 50 is arranged at one end of the guide rod 5, and the limiting plate 50 is located in the limiting groove.

[0045] The pipeline 1 includes multiple pipeline parts, which are arranged along the axial direction of the cylinder 21. In this embodiment, three pipeline parts are arranged, namely the first pipeline part 10, the second pipeline part 11, and the third pipeline part 12, wherein the second pipeline part 11 is sleeved outside the hydraulic cylinder and the cone valve body 4.

[0046] Specifically, the first pipeline part 10 includes a first pipe 101, and the second pipeline part 11 includes a plurality of coaxially arranged pipes. The number of pipes can be set according to the length of the hydraulic cylinder. In this embodiment, the second pipeline part 11 includes a second pipe and a third pipe 112, and the third pipeline part 12 includes a fourth pipe 121. The second pipeline part 11 in the built-in area of ​​the hydraulic assembly 2 is preferably a segmented type, which facilitates the subsequent maintenance and maintenance of the hydraulic assembly 2 and the cone valve body 4 and other parts.

[0047] The cylinder bottom 20 is connected between the first pipe fitting 101 and the second pipe fitting 111. Flange plates 6 are welded to one end of the first pipe fitting 101 and the second pipe fitting 111 facing the cylinder bottom 20. The flange plate 6 on the first pipe fitting 101 and the flange plate 6 on the second pipe fitting 111 are connected by screws 206 and nuts. A boss 201 adapted to the outer circle of the cylinder bottom 20 is provided on the side wall of the flange plate 6 facing the cylinder bottom 20, so as to facilitate the positioning of the cylinder bottom 20 and clamp the cylinder bottom 20 between the first pipe fitting 101 and the second pipe fitting 111. Sealing grooves are provided at both ends of the cylinder bottom 20, and a static sealing structure is provided in the sealing groove to realize a sealed connection between the cylinder bottom 20 and the flange plate 6.

[0048] The second pipe fitting 111 is coaxially connected to the third pipe fitting 112, and the second pipe fitting 111 and the third pipe fitting 112 are connected by bolts. A sleeve 7 is coaxially arranged in the second pipeline portion 11, and the sleeve 7 can be arranged in a segmented manner. The sleeve 7 is sleeved outside the hydraulic cylinder and the cone valve body 4. A valve body seat 70 is connected to the inner side wall of the sleeve 7. The valve body seat 70 is arranged in a ring shape. A flow surface 71 and a transition surface 72 are arranged on the valve body seat 70. The flow surface 71 is inclined toward the cylinder bottom 20, and the transition surface 72 is inclined toward the direction away from the cylinder bottom 20. When the conical valve body 4 moves with the piston rod 22, the conical valve body 4 moves toward the valve body seat 70. Due to the angle between the flow surface 71 and the conical surface on the conical valve body 4, the flowable area (that is, the opening) of the conical valve body 4 and the valve body seat 70 will gradually decrease until they are fully fitted, and a line contact is formed between the conical valve body 4 and the flow surface 71. At this time, the flow in the pipeline is closed. The setting of the line contact can reduce the processing accuracy of the conical valve body 4 and the valve body seat 70, and the sealing effect of the line contact is better.

[0049] The fourth pipe fitting 121 is connected to the third pipe fitting 112 through the transition plate 8. The transition plate 8 is provided with a through hole for the guide rod 5 to pass through. The guide rod 5 guides the cone valve body 4 to prevent the piston rod 22 from bending due to the weight of the cone valve body 4 after the piston rod 22 is fully extended, and the piston rod 22 from drawing after long-term operation.

[0050] A flange plate 6 is also welded to one end of the third pipe fitting 112 and the fourth pipe fitting 121 facing the cylinder bottom 20. The flange plate 6 on the third pipe fitting 112 and the flange plate 6 on the fourth pipe fitting 121 are connected by screws 206 and nuts. A boss 201 adapted to the outer circle of the transition plate 8 is provided on the side wall of the flange plate 6 facing the cylinder bottom 20, so as to facilitate the positioning of the transition plate 8 and clamp the transition plate 8 between the third pipe fitting 112 and the fourth pipe fitting 121. Sealing grooves are also provided at both ends of the transition plate 8, and a static sealing structure is provided in the sealing groove to realize a sealed connection between the transition plate 8 and the flange plate 6.

[0051] Specifically, a mounting area and a circulation area are provided on the cylinder bottom 20 . The circulation area is coaxially arranged outside the mounting area, and the mounting area is arranged at the axial center position of the cylinder bottom 20 .

[0052] The boss 201 on the cylinder bottom 20 is arranged on the installation area, and the boss 201 is provided with an installation groove 204 for installing the displacement sensor 3. The boss 201 on the cylinder bottom 20 is provided with an installation groove 204 for installing the displacement sensor 3. The cylinder bottom 20 is provided with a fixing hole 205 along the radial direction of the cylinder bottom 20. A plurality of fixing holes 205 are arranged along the circumferential direction of the cylinder bottom 20. The fixing hole 205 is connected with the installation groove 204. The cylinder bottom 20 is threadedly connected with a screw 206 through the fixing hole 205. A steel plate is provided between the screw 206 and the displacement sensor 3. The ball 207 is provided with an embedding groove 30 on the side wall of the side head part of the displacement sensor 3. The steel ball 207 is located in the embedding groove 30. The length of the groove bottom of the embedding groove 30 along the axial direction of the piston rod 22 is 0.5-1mm. The diameter of the steel ball 207 is smaller than the inner diameter of the fixing hole 205. The steel ball 207 is put into the fixing hole 205 so that the steel ball 207 is embedded in the embedding groove 30. Then, the steel ball 207 is pressed with a screw 206. In this way, the probe part of the displacement sensor 3 does not move in the mounting hole, and the probe part of the displacement sensor 3 is fixed. The side wall of the embedding groove 30 away from the piston rod 22 is tilted in the direction away from the piston rod 22, so that when the steel ball 207 needs to be removed, the displacement sensor 3 is pulled out, and the steel ball 207 can enter the fixing hole 205 under the push of the inclined surface on the embedding groove 30.

[0053] The measuring rod part of the displacement sensor 3 is inserted into the piston rod 22. A magnetic ring is sleeved on the measuring rod part of the displacement sensor 3. A receiving groove for accommodating the magnetic ring is provided on the piston rod 22. The receiving groove is provided at the end of the piston rod 22 close to the cylinder bottom 20. The displacement sensor 3 is used to monitor the progress of the piston rod 22 and the cone valve body 4.

[0054] A working hole group is provided on the cylinder bottom 20, and the working hole group and the fixed hole 205 are arranged along the axial direction of the cylinder bottom 20. The working hole group includes three holes arranged along the axial direction of the cylinder bottom 20, namely, a rod chamber oil hole 208, a rodless chamber oil hole 209 and a wiring hole. The rod chamber oil hole 208 is connected with the oil through hole 211 on the cylinder barrel 21, so as to realize the flow of pressurized oil into the rod chamber of the hydraulic cylinder. The rodless chamber oil hole 209 is connected with the mounting groove 204, and the cable on the displacement sensor 3 passes through the wiring hole and is connected to the sensor electronic compartment.

[0055] The cylinder bottom 20 and the transition plate 8 are both provided with waist-shaped openings 203 penetrating the cylinder bottom 20 along the axial direction of the cylinder bottom 20 . The waist-shaped openings 203 on the cylinder bottom 20 are provided in the circulation area.

[0056] In addition, in order to ensure the sealing of the hydraulic cylinder, two sealing grooves are provided on the side wall of the piston part of the piston rod 22. The sealing grooves are arranged along the axial direction of the piston rod 22. A sealing ring 221 is arranged in the sealing groove. The sealing ring 221 adopts a PTFE sliding ring seal, which can effectively reduce the friction of the sealing ring 221. A guide ring 222 is designed on the left and right sides of the sealing ring 221 for piston guidance. On the inner side wall of the guide sleeve 23, two guide rings 222 and two sealing rings 223 are arranged along the axial direction of the piston rod 22. The sealing ring 223 is located on the side of the guide ring 222 away from the cylinder bottom 20. An annular groove is arranged at one end of the sealing ring 233. The cross section of the sealing ring 223 can be set to be U-shaped or V-shaped. Since the fluid in the pipeline generally has more or less pressure, the pressure can drive the fluid in the pipeline to flow all the time, but the ordinary dust ring cannot withstand the pressure. The groove on the sealing ring 223 arranged near the cylinder bottom 20 of the two sealing rings 223 is located at the end of the sealing ring 223 facing the cylinder bottom 20, and the groove on the sealing ring 223 arranged away from the cylinder bottom 20 is located at the end of the sealing ring 223 away from the cylinder bottom 20. Among them, the sealing ring 223 with the groove arranged at the end of the sealing ring 233 away from the cylinder bottom 20 can effectively reduce friction while bearing pressure.

[0057] In addition, since the internal pressure of the oil cylinder is much higher than the external pressure (that is, the pressure of the fluid in the pipeline) when the oil cylinder is working, the wider sealing ring 221 has a higher pressure resistance, the sealing ring 221 itself has less stress, better sealing performance, and longer sealing life. Therefore, the sealing ring 223 arranged near the cylinder bottom 20 is thicker along the axial direction of the piston rod 22 than the other sealing ring 223.

[0058] It should be noted that, in order to ensure the stability of the pipeline 1, two support seats are welded on the outer circle of the pipeline 1 to facilitate the placement and transportation of the entire component to prevent it from rolling in the venue.

[0059] In other embodiments, in addition, in some cases, the installation space of the hydraulic component 1 is too small, which results in that the displacement sensor 3 cannot be directly installed on the hydraulic component 1 as in the traditional way. In this case, a split displacement sensor 3 can be used, and the measuring rod and the electronic compartment of the displacement sensor 3 can be designed on different structural parts and connected by a cable in the middle. In this case, a support seat can also be welded to the outer wall of the pipe 1, and screw holes are designed on the support seat to meet the installation requirements of the electronic compartment of the displacement sensor 3.

[0060] When the hydraulic assembly 2 is used as an actuator in the pipeline 1, a hydraulic medium that is compatible with the fluid in the pipeline 1 is preferred, which can effectively avoid the impact of leakage, is pollution-free, and can be widely used in the chemical, food and other industries.

[0061] When oil is passed through the rodless chamber oil hole 209 of the hydraulic cylinder, the piston rod 22 is pushed out to the right, and the cone valve body 4 and the guide rod 5 are extended along with the piston rod 22. There is an angle between the flow surface 71 and the conical surface on the cone valve body 4. When the cone valve body 4 moves toward the valve body seat 70, the flowable area (that is, the opening) of the cone valve body 4 and the valve body seat 70 will gradually decrease until they are completely fitted, and a line contact is formed between the cone valve body 4 and the flow surface 71. At this time, the flow in the pipeline is closed. Similarly, when oil is passed through the rod chamber of the hydraulic cylinder, the cone valve body 4 and the guide rod 5 are retracted along with the piston rod 22, and the flowable area of ​​the cone valve body 4 and the valve body seat 70 will gradually increase until it is fully opened and the piston rod 22 is fully retracted. At this time, the flow in the pipeline is closed. The flow area reaches the maximum; the guide rod 5 serves as a guiding element of the piston rod 22 to prevent the piston rod 22 from bending due to the weight of the cone valve body 4 after the hydraulic cylinder is fully extended, and the piston rod 22 from drawing after long-term operation; when the hydraulic cylinder reciprocates, the built-in displacement sensor 3 will monitor the position of the piston rod 22 in real time and transmit it back to the control system, which means that the opening of the cone valve body 4 in the pipeline can be monitored in real time, so that the external operator can adjust the opening of the cone valve body 4 in real time through the control system to achieve the purpose of controlling the fluid flow in the pipeline; in addition, the sealing ring 221 of the hydraulic cylinder is made of a material with low friction resistance, so that the hydraulic cylinder can meet the low friction requirements.

[0062] A servo valve 9 can also be set on the outside of the pipeline 1. When the servo valve 9 is set in the hydraulic system, it is selected to be installed close to the hydraulic cylinder in combination with the position feedback signal of the displacement sensor 3, that is, the servo valve 9 is installed on the outer wall of the second pipe fitting 111. This can minimize the connection of the hydraulic pipeline to reduce the influence of the hydraulic shock in the hydraulic pipeline on the servo control. The control system can control the position of the hydraulic cylinder piston rod 22 in a closed loop to adjust the opening of the cone valve. The automatic adjustment by the control system can greatly reduce the labor cost.

[0063] In summary, the present application adopts the combination of hydraulic assembly 2 and cone valve body 4 for flow control, which can reduce the wear on the structural parts, has a long service life, and has a strong bearing capacity. With the use of displacement sensor 3, displacement sensor 3 can provide real-time feedback on the progress of piston rod 22 and cone valve body 4, so as to accurately control the opening in the pipe, accurately control the flow in pipeline 1, and the flow control action is smooth. Furthermore, compared with mechanical structures (valves, servo motors, etc.), the hydraulic assembly 2 is set in pipeline 1, which does not need to occupy the space outside pipeline 1, so that the space occupied by the flow control structure can be effectively reduced, thereby reducing the space occupied by the pipeline 1 as a whole.

[0064] The pipeline 1 is configured as a segmented type, and in particular, the second pipeline portion 11 in the built-in area of ​​the hydraulic component 2 is preferably configured as a segmented type, which facilitates the subsequent maintenance and repair of the hydraulic component 2 and the cone valve body 4 and other parts.

[0065] In the sealing of the hydraulic component 2, sealing structures are arranged on the piston part of the piston rod 22 and between the piston rod 22 and the guide sleeve 23. In particular, between the piston rod 22 and the guide sleeve 23, a structure with two sealing rings 223 with opposite openings is adopted. The sealing ring 223 with an opening away from the cylinder bottom 20 can effectively reduce friction while bearing pressure, and a thicker sealing ring 223 is arranged to improve the pressure resistance of the sealing ring 223, thereby effectively isolating the hydraulic component 2 from the fluid in the pipeline 1.

[0066] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A hydraulic mechanism for controlling the flow of a fluid in a pipeline, characterized in that: The hydraulic mechanism is arranged in the pipeline (1), and comprises: A hydraulic assembly (2), the hydraulic assembly (2) comprising a piston rod (22) capable of moving axially along the pipeline (1); A cone valve body (4), wherein the cone valve body (4) is connected to the piston rod (22); A valve body seat (70), wherein the valve body seat (70) is arranged on the inner side wall of the pipeline (1), and the valve body seat (70) can form a line contact with the cone valve body (4); A displacement sensor (3) is connected to the piston rod (22) and is used to monitor the progress of the piston rod (22).

2. The hydraulic mechanism for controlling the flow of fluid in a pipeline according to claim 1, characterized in that: The valve body seat (70) is provided with a flow surface (71), the flow surface (71) is inclined toward the piston rod (22), and an angle exists between the flow surface (71) and the conical surface on the conical valve body (4).

3. The hydraulic mechanism for controlling the flow rate of fluid in a pipeline according to claim 2, characterized in that: A transition surface (72) is provided on the valve body seat (70), the transition surface (72) is inclined in a direction away from the cylinder bottom (20), and the transition surface (72) is provided on a side of the flow surface (71) away from the piston rod (22).

4. The hydraulic mechanism for controlling the flow of fluid in a pipeline according to claim 1, characterized in that: The pipeline (1) comprises three coaxially arranged pipeline parts, namely a first pipeline part (10), a second pipeline part (11) and a third pipeline part (12).

5. The hydraulic mechanism for controlling the flow rate of fluid in a pipeline according to claim 4, characterized in that: The hydraulic assembly (2) and the cone valve body (4) are arranged in the second pipeline portion (11), the valve body seat (70) is arranged on the inner side wall of the second pipeline portion (11), and the second pipeline portion (11) includes a plurality of coaxially arranged pipe fittings.

6. The hydraulic mechanism for controlling the flow of fluid in a pipeline according to claim 5, characterized in that: A transition plate (8) is sealed between the second pipeline portion (11) and the third pipeline portion (12), and a waist-shaped opening (203) is also provided on the transition plate (8). A guide rod (5) is connected to the cone valve body (4), and the guide rod (5) passes through the transition plate (8).

7. The hydraulic mechanism for controlling the flow of fluid in a pipeline according to claim 1, characterized in that: The hydraulic assembly (2) further comprises a cylinder bottom (20), a cylinder barrel (21) and a guide sleeve (23); the cylinder barrel (21) is connected between the cylinder bottom (20) and the guide sleeve (23); the piston rod (22) is movably connected to the cylinder barrel (21) along the axial direction of the cylinder barrel (21); and the piston rod (22) passes through the guide sleeve (23).

8. The hydraulic mechanism for controlling the flow of fluid in a pipeline according to claim 7, characterized in that: Two sealing rings (223) are arranged on the inner side wall of the guide sleeve (23) along the axial direction of the piston rod (22), and one end of the sealing ring (223) is provided with an annular groove, and the groove on the sealing ring (223) arranged close to the cylinder bottom (20) of the two sealing rings (223) is located at the end of the sealing ring (223) facing the cylinder bottom (20), and the groove on the sealing ring (223) arranged away from the cylinder bottom (20) is located at the end of the sealing ring (223) away from the cylinder bottom (20).

9. The hydraulic mechanism for controlling the flow of fluid in a pipeline according to claim 7, characterized in that: The cylinder bottom (20) is provided with a rodless chamber oil hole (209) and a rod chamber oil hole (208); an oil through hole (211) is provided in the wall thickness of the cylinder barrel (21); the rod chamber oil hole (208) is communicated with the oil through hole (211); the cylinder bottom (20) is sealed and connected between the second pipeline portion (11) and the first pipeline portion (10); the displacement sensor (3) is arranged between the cylinder bottom (20) and the piston rod (22); and a waist-shaped opening (203) is provided on the cylinder bottom (20).

10. The hydraulic mechanism for controlling the flow of fluid in a pipeline according to claim 9, characterized in that: The cylinder bottom (20) is provided with a mounting area and a circulation area, the circulation area is coaxially arranged outside the mounting area, the mounting area is provided with a mounting groove (204) for mounting a displacement sensor (3), and the waist-shaped opening (203) is arranged on the circulation area.

11. The hydraulic mechanism for controlling the flow of fluid in a pipeline according to claim 10, characterized in that: A boss (201) is provided on the installation area on the cylinder bottom (20), the installation groove (204) is provided on the boss (201), and the cylinder barrel (21) is sleeved on the boss (201) and is sealed and connected to the boss (201).

12. The hydraulic mechanism for controlling the flow of fluid in a pipeline according to claim 10, characterized in that: A fixing hole (205) is provided on the side wall of the cylinder bottom (20), a screw (206) is threadedly connected to the cylinder bottom (20) through the fixing hole (205), a steel ball (207) is provided between the screw (206) and the displacement sensor (3), the diameter of the steel ball (207) is smaller than the inner diameter of the fixing hole (205), and an embedding groove (30) is provided on the side wall of the side head portion of the displacement sensor (3), and the steel ball (207) is located in the embedding groove (30).

13. The hydraulic mechanism for controlling the flow of fluid in a pipeline according to claim 12, characterized in that: The side wall of the embedding groove (30) away from the piston rod (22) is arranged to be inclined in a direction away from the piston rod (22).

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