A throttle valve for controlling throttle opening degree of an electric cylinder and a working method thereof

Abstract

The application discloses a throttle valve for controlling throttle opening degree of an electric cylinder and a working method thereof, and relates to the technical field of throttle valve pressure regulation. A downward pressing assembly for pressing the valve core downward is arranged between a frame and a valve cover. A pulling assembly for pulling the valve core downward is arranged on the left and right side walls of a conveying pipe. The pulling assembly on the left side comprises a blind groove arranged on the inner side wall of the conveying pipe, a nut fixed to the left side of the conveying pipe and opposite to the blind groove, a pin shaft fixed between the front and back walls of the blind groove, an L-shaped force block arranged in the blind groove and rotatably installed on the pin shaft, a screw rod threadedly connected with the nut, an arc-shaped end head fixed to the extending end of the screw rod and opposite to the long block of the L-shaped force block. The application has the beneficial effect that the valve core which has been moved to the position can be prevented from continuously moving upward, and the pressure regulation precision is higher.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of throttle valve pressure regulating, and particularly relates to a throttle valve with a throttling opening controlled by an electric cylinder and a working method thereof. BACKGROUND

[0002] The pressure control throttle manifold is used for conveying fluid mined from a well to a post-stage processing device, and also serves to change the output pressure of the fluid. The pressure control throttle manifold used in a certain area comprises a flat valve and an electric cylinder type throttle valve which are sequentially fixed to a wellhead. In operation, fluid mined from the well sequentially passes through the wellhead, an inner passage of the flat valve, a throttling opening of the electric cylinder type throttle valve, and finally is conveyed to the post-stage processing device. The flat valve is used to cut off the inner passage to prevent the fluid from flowing to the electric cylinder type throttle valve, and the electric cylinder type throttle valve is used to change the throttling opening therein, thereby changing the output pressure of the fluid, and then conveying the fluid to the post-stage processing device smoothly.

[0003] The structure of the electric cylinder type throttle valve is shown in Figures 1-3 It comprises a valve body 1, a frame 2 sequentially and fixedly arranged on the top of the valve body 1, and an electric cylinder 3. The valve body 1 is internally provided with a cavity 4. An inlet hole 5 is arranged on the left end surface of the valve body 1 and is in communication with the cavity 4. An outlet hole 6 is arranged on the bottom surface of the valve body 1 and is in communication with the cavity 4. A conveying pipe 7 is fixedly arranged on the bottom surface of the outlet hole 6 and is in communication with the outlet hole 6. A valve seat 8 is fixedly arranged in the outlet hole 6.

[0004] A valve cover 9 is fixedly arranged on the top surface of the valve body 1. A guide seat 10 extending downward into the cavity 4 is fixedly arranged on the bottom surface of the valve cover 9. A guide hole 11 is in communication with the cavity 4. The piston rod of the electric cylinder 3 downwardly penetrates the top wall of the frame 2 and is connected with a valve rod 12 at the extending end. The valve rod 12 sequentially penetrates the bottom wall of the frame 2, the valve cover 9 and the guide hole 11 downward and extends into the cavity 4. A valve core 13 is fixedly arranged on the extending end of the valve rod 12. The upper end of the valve core 13 is in sliding fit with the guide hole 11. The lower end of the valve core 13 extends into the valve seat 8 and forms an annular cavity between the inner wall of the valve seat 8 and the valve core 13. The annular cavity is a throttling opening 14.

[0005] In operation, fluid returned from the wellhead sequentially passes through the inlet hole 5, the cavity 4, the throttling opening 14 and the outlet hole 6, and finally is conveyed to the post-stage processing device through the conveying pipe 7. The movement direction of the fluid is shown by the arrow in Figure 4 When a worker wants to increase the pressure of the fluid entering the conveying pipe 7, the worker controls the electric cylinder 3 through a controller to retract the piston rod upward. The piston rod drives the valve rod 12 to move upward. The valve rod 12 drives the valve core 13 to move along the guide hole 11 away from the valve seat 8. When the piston rod of the electric cylinder 3 is retracted to the set stroke, the valve core 13 has been moved to the position, as shown in Figure 5As shown, at this time, the controller controls the electric cylinder 3 to close, thereby increasing the throttling opening 14, and thus achieving the purpose of increasing the fluid pressure entering the delivery pipe 7.

[0006] However, although this type of electric cylinder throttle valve can increase the pressure of the fluid entering the delivery pipe 7, it still has the following technical drawbacks:

[0007] Once the valve core 13 has reached its designated position, the pressure exerted by the fluid on the bottom surface of the valve core 13 also increases. The direction of the pressure exerted on the bottom surface of the valve core 13 is as follows: Figure 6 As indicated by the hollow arrow, the pressure pushes the valve core 13, which has already moved to its position, upward. The valve core 13 then pushes the valve stem 12 and the piston rod of the electric cylinder 3 upward. In other words, the pressure of the fluid acting on the bottom surface of the valve core 13 continuously pushes the valve core 13, which has already moved to its position, upward, thereby causing the throttling opening 14 to continuously increase. This results in the pressure of the fluid entering the delivery pipe 7 continuously increasing. [However, the actual operation requires that the pressure of the fluid entering the delivery pipe 7 no longer change after the piston rod of the electric cylinder 3 retracts upward to the set stroke].

[0008] Therefore, it can be seen that this electric cylinder type throttle valve cannot prevent the valve core, which has already moved to its position, from continuing to move upward, and thus cannot prevent the pressure of the fluid entering the delivery pipe from continuously increasing, resulting in a technical defect of low pressure regulation accuracy.

[0009] Therefore, there is an urgent need for a throttle valve and its working method that can prevent the valve core, which has already been moved into place, from continuing to move upward and has higher pressure regulation accuracy. Summary of the Invention

[0010] The purpose of this invention is to overcome the shortcomings of the prior art and provide a throttle valve for controlling the throttle opening by an electric cylinder and its working method.

[0011] The objective of this invention is achieved through the following technical solution: a throttle valve with electric cylinder controlling the throttle opening, comprising a valve body, a frame and an electric cylinder sequentially fixed to the top of the valve body, an inlet hole communicating with the cavity of the valve body is provided on the left end face of the valve body, an outlet hole communicating with the cavity is provided on the bottom surface of the valve body, a delivery pipe communicating with the bottom surface of the outlet hole is fixedly provided on the bottom surface of the outlet hole, and a valve seat is fixedly provided inside the outlet hole;

[0012] The top surface of the valve body is fixed with a valve cover, the bottom surface of the valve cover is fixed with a guide seat extending downward in the cavity, the bottom surface of the guide seat is provided with a guide hole communicating with the cavity, the piston rod of the electric cylinder penetrates downward through the top wall of the frame, and the extending end is connected with a valve rod, the valve rod penetrates downward through the bottom wall of the frame, the valve cover and the guide hole in sequence and extends into the cavity, the extending end of the valve rod is fixed with a valve core, the upper end of the valve core is in sliding fit with the guide hole, the lower end of the valve core extends into the valve seat and forms a throttling opening with the inner wall of the valve seat, a downward pressing assembly is arranged between the frame and the valve cover for pressing the valve core downward, the downward pressing assembly comprises screw seats fixed between the left and right side walls of the frame, a pressing cylinder threadedly connected in the screw seat and sleeved on the outer portion of the valve rod, and a floating plate sleeved on the outer portion of the valve rod, the bottom surface of the floating plate is fixed with a plurality of force transmission rods in the circumferential direction, the force transmission rods penetrate downward through the bottom wall of the frame, the valve cover and the guide hole in sequence and extend into the guide hole, the force transmission rods are located directly above the valve core, a spring is sleeved on each force transmission rod, and the upper and lower ends of the spring are fixed on the floating plate and the bottom wall of the frame respectively, under the elastic force of the spring, the floating plate is pressed against the bottom surface of the pressing cylinder.

[0013] The bottom surface of the valve rod is fixed with a rod member penetrating downward through the valve seat, the liquid outlet hole and extending into the conveying pipe in sequence, the extending end of the rod member is fixed with a support plate on the left and right cylindrical surfaces, and the front end faces of the two support plates are fixed with circular heads.

[0014] The left and right side walls of the conveying pipe are provided with pulling assemblies for pulling the valve core, the pulling assembly located on the left side comprises a blind groove formed in the inner side wall of the conveying pipe and a nut fixed on the left side of the conveying pipe and opposite to the blind groove, a pin shaft is fixed between the front and rear walls of the blind groove, an L-shaped force transmission block located in the blind groove is rotatably mounted on the pin shaft, a torsional spring is sleeved on the pin shaft, and the front and rear ends of the torsional spring are fixed on the rear end face of the L-shaped force transmission block and the rear side wall of the blind groove respectively.

[0015] The short block of the L-shaped force transmission block extends into the conveying pipe and is fixed with a yoke on the extending end, the U-shaped groove of the yoke is sleeved on the outer portion of the left circular head, a screw rod is threadedly connected in the nut, the screw rod extends into the blind groove and is fixed with an arc-shaped end on the extending end, and the arc-shaped end is opposite to the long block of the L-shaped force transmission block.

[0016] A dynamic sealing member is arranged between the contact portions of the valve core and the guide seat, a dynamic sealing member is arranged between the valve body and the guide seat, and a sealing ring is arranged between the valve rod and the valve cover.

[0017] An outer thread is formed in the outer wall of the pressing cylinder, the outer thread of the pressing cylinder is connected with the inner thread of the screw seat, and a hand wheel A is welded on the outer wall of the upper end of the pressing cylinder.

[0018] The force transmission rods are evenly arranged on the outer edges of the floating plate.

[0019] The rod, valve rod and piston rod of the electric cylinder are coaxially arranged.

[0020] The outer part of the screw rod is fixedly provided with a hand wheel B.

[0021] The two pulling assemblies are identical in structure and are symmetrically arranged about the rod.

[0022] The electric cylinder is electrically connected with the controller through a signal line.

[0023] A working method of a throttle valve for controlling the throttle opening of the throttle valve, comprising the following steps:

[0024] S1, the liquid inlet hole of the throttle valve is fixedly installed at the liquid outlet of the flat valve; the bottom port of the conveying pipe is fixedly installed in the post-treatment device; the flat valve is opened, and the fluid returned from the wellhead is sequentially conveyed through the liquid inlet hole, the cavity, the throttle opening, the liquid outlet hole, the conveying pipe and finally the bottom port of the conveying pipe to the post-treatment device;

[0025] S2, when the pressure of the fluid entering the conveying pipe needs to be increased, the specific operation steps of the worker are as follows:

[0026] S21, the worker controls the piston rod of the electric cylinder to retract upwardly through the controller, the piston rod drives the valve rod to move upwardly relative to the stationary compression cylinder, the valve rod drives the valve core and the rod to move upwardly synchronously, wherein the valve core moves along the guide hole away from the valve seat, at the same time, the rod also drives the two supporting plates to move upwardly synchronously, the supporting plates drive the circular head to move upwardly synchronously, the circular head drives the fork to move upwardly, the fork drives the L-shaped force block to rotate outwardly around the axis of the pin, at the same time, the L-shaped force block makes the torsional spring to be twisted and deformed;

[0027] When the piston rod of the electric cylinder is retracted to the set stroke upwardly, the valve core has been moved to the position, at this time, the controller controls the electric cylinder to be closed, thereby increasing the throttle opening, and further achieving the purpose of increasing the pressure of the fluid entering the conveying pipe;

[0028] S22, the worker rotates the hand wheel A of the downward pressing assembly by hand, the hand wheel A drives the compression cylinder to rotate synchronously, the compression cylinder is screwed downwardly relative to the stationary threaded seat, the bottom end of the compression cylinder presses the floating plate downwardly, the floating plate compresses the spring and also drives the force rods thereon to move downwardly, when the worker can no longer rotate the hand wheel A of the downward pressing assembly, the bottom end of each force rod abuts against the top surface of the valve core.

[0029] S23, the worker manually rotates the hand wheel B of the left pulling assembly, the hand wheel B drives the screw to rotate, the screw drives the arc-shaped end to move towards the long block of the L-shaped force block, when the worker can no longer rotate the hand wheel B of the left pulling assembly, the arc-shaped end of the left side is pressed on the long block of the L-shaped force block, at this time, the L-shaped force block of the left side pulls the yoke downwards, the yoke in turn pulls the circular cylindrical head corresponding thereto downwards, the circular cylindrical head pulls the rod downwards, the rod pulls the valve stem downwards, and the valve stem in turn pulls the valve core downwards, so that the valve core has a downward movement trend;

[0030] S24, the worker manually rotates the hand wheel B of the right pulling assembly, when the worker can no longer rotate the hand wheel B of the right pulling assembly, the arc-shaped end of the right side is pressed on the long block of the L-shaped force block, at this time, the L-shaped force block of the right side pulls the yoke downwards, the yoke in turn pulls the circular cylindrical head corresponding thereto downwards, the circular cylindrical head pulls the rod downwards, the rod pulls the valve stem downwards, and the valve stem in turn pulls the valve core downwards, so that the valve core has a downward movement trend;

[0031] S3, when the pressure of the fluid entering the conveying pipe is to be lowered, the specific operation steps of the worker are as follows:

[0032] S31, the worker reversely rotates the hand wheel A of the downward pressing assembly, the hand wheel A drives the pressing cylinder to rotate upwards relative to the stationary threaded seat, when the pressing cylinder moves upwards, under the elastic restoring force of the compression spring, the floating plate moves upwards, and the floating plate in turn drives the plurality of force transmission rods to move upwards, and the force transmission rods are separated from the valve core;

[0033] S32, the worker reversely rotates the hand wheel B of the left pulling assembly and the hand wheel B of the right pulling assembly, so that the screw moves away from the L-shaped force block;

[0034] S33, the worker controls the piston rod of the electric cylinder to extend downwards through the controller, the piston rod drives the valve stem to move downwards relative to the stationary pressing cylinder, and the valve stem drives the valve core and the rod to move downwards synchronously, wherein the valve core moves towards the valve seat along the guide hole, and at the same time, the rod also drives the two supporting plates to move downwards synchronously, the supporting plates drive the circular cylindrical head to move downwards synchronously, and the circular cylindrical head drives the yoke to move downwards;

[0035] When the piston rod of the electric cylinder extends downwards to a set stroke, the controller controls the electric cylinder to be closed, at this time, the valve core is moved to the position, so that the throttling opening is reduced, and the purpose of lowering the pressure of the fluid entering the conveying pipe is achieved.

[0036] The present application has the following advantages:

[0037] The valve core that has been moved to the position can be prevented from continuously moving upwards, and the pressure regulating precision is higher. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 Structure diagram of the prior art electric cylinder throttle valve;

[0039] Figure 2 Structure diagram of the prior art electric cylinder throttle valve; Figure 1 Connection diagram of the valve cover and the guide seat in the prior art electric cylinder throttle valve;

[0040] Figure 3 Connection diagram of the valve stem, the valve core and the electric cylinder in the prior art electric cylinder throttle valve; Figure 1 Connection diagram of the valve stem, the valve core and the electric cylinder in the prior art electric cylinder throttle valve;

[0041] Figure 4 Direction diagram of the movement of the fluid;

[0042] Figure 5 Structure diagram of the prior art electric cylinder throttle valve; Figure 1 Diagram of the electric cylinder throttle valve controlling the movement of the valve core to the position in the prior art electric cylinder throttle valve;

[0043] Figure 6 Diagram of the pressure acting on the bottom surface of the valve core;

[0044] Figure 7 Structure diagram of the present application;

[0045] Figure 8 Connection diagram of the threaded seat, the pressing cylinder and the hand wheel A of the pressing assembly;

[0046] Figure 9 Main section diagram of the present application; Figure 8

[0047] Figure 10 Connection diagram of the floating plate and the plurality of force transmission rods of the pressing assembly;

[0048] Figure 11 Main section diagram of the present application; Figure 10

[0049] Connection diagram of the rod member, the supporting plate, the circular head and the valve stem, the valve core and the electric cylinder; Figure 12

[0050] Connection diagram of the rod member, the supporting plate and the circular head in the present application; Figure 13 Figure 12 Front view of the present application;

[0051] Figure 14 Figure 13 M part local enlarged view of the present application;

[0052] Figure 15 K-K section view of the present application; Figure 7

[0053] Figure 16 Figure 15

[0054] Figure 17 ​​​​​​The connection diagram of the L-shaped force block and the shift fork;

[0055] Figure 18 The front view of Figure 17

[0056] Figure 19 The connection diagram of the screw rod, the arc-shaped end head and the hand wheel B;

[0057] Figure 20 The front view of Figure 19

[0058] Figure 21 The diagram of the valve core having been moved to the position;

[0059] Figure 22 The diagram of the bottom end of each force rod pressing against the top surface of the valve core;

[0060] Figure 23 The diagram of the arc-shaped end head on the left pressing against the long block of the L-shaped force block;

[0061] Figure 24 The diagram of the arc-shaped end head on the right pressing against the long block of the L-shaped force block;

[0062] In the diagram:

[0063] 1-valve body, 2-frame, 3-electric cylinder, 4-cavity, 5-inlet hole, 6-outlet hole, 7-delivery pipe, 8-valve seat, 9-valve cover, 10-guide seat, 11-guide hole, 12-valve rod, 13-valve core, 14-throttle opening;

[0064] 15-threaded seat, 16-pressing cylinder, 17-floating plate, 18-force rod, 19-spring, 20-rod, 21-branch plate, 22-circular head;

[0065] 23-pulling assembly, 24-blind groove, 25-nut, 26-pivot, 27-L-shaped force block, 28-torsional spring, 29-shift fork, 30-U-shaped groove, 31-screw rod, 32-arc-shaped end head;

[0066] 34-external thread, 35-hand wheel A, 36-hand wheel B. DETAILED DESCRIPTION

[0067] The present application will be further described below in conjunction with the accompanying drawings, and the protection scope of the present application is not limited to the following description:

[0068] As Figures 7-20 ​​As shown, a throttle valve for controlling throttle opening degree of an electric cylinder, comprising a valve body 1, a frame 2 and an electric cylinder 3 which are sequentially fixed on the top of the valve body 1, a liquid inlet hole 5 is formed on the left end surface of the valve body 1 and is communicated with a cavity 4 of the valve body 1, a liquid outlet hole 6 is formed on the bottom surface of the valve body 1 and is communicated with the cavity 4, a delivery pipe 7 is fixed on the bottom surface of the liquid outlet hole 6 and is communicated with the liquid outlet hole 6, and a valve seat 8 is fixed in the liquid outlet hole 6.

[0069] A valve cover 9 is fixed on the top surface of the valve body 1, a guide seat 10 is fixed on the bottom surface of the valve cover 9 and extends downward in the cavity 4, a guide hole 11 is formed on the bottom surface of the guide seat 10 and is communicated with the cavity 4, the piston rod of the electric cylinder 3 penetrates downward through the top wall of the frame 2 and is connected with a valve rod 12 at the extending end, the valve rod 12 penetrates downward through the bottom wall of the frame 2, the valve cover 9 and the guide hole 11 in sequence and extends in the cavity 4, a valve core 13 is fixed on the extending end of the valve rod 12, the upper end of the valve core 13 is in sliding fit with the guide hole 11, the lower end of the valve core 13 extends into the valve seat 8 and forms a throttle opening degree 14 between the valve core 13 and the inner wall of the valve seat 8.

[0070] A downward pressing assembly for pressing downward the valve core 13 is arranged between the frame 2 and the valve cover 9, the downward pressing assembly comprises a threaded seat 15 which is fixed between the left and right side walls of the frame 2, a pressing cylinder 16 which is threadedly connected in the threaded seat 15 and is sleeved on the outer portion of the valve rod 12, and a floating plate 17 which is sleeved on the outer portion of the valve rod 12, a plurality of force transmission rods 18 are fixed on the bottom surface of the floating plate 17 and along the circumferential direction of the floating plate 17, the force transmission rods 18 penetrate downward through the bottom wall of the frame 2, the valve cover 9 and extend into the guide hole 11 in sequence, the force transmission rods 18 are located right above the valve core 13, a spring 19 is sleeved on each force transmission rod 18, the upper and lower ends of the spring 19 are fixed on the floating plate 17 and the bottom wall of the frame 2 respectively, and the floating plate 17 is pressed on the bottom surface of the pressing cylinder 16 under the elastic force of the spring 19.

[0071] The force transmission rods 18 are evenly arranged on the outer edges of the floating plate 17. An external thread 34 is formed on the outer wall of the pressing cylinder 16, the external thread 34 of the pressing cylinder 16 is connected with the internal thread of the threaded seat 15, and a hand wheel A 35 is welded on the outer wall of the upper end of the pressing cylinder 16.

[0072] A rod member 20 is fixed on the bottom surface of the valve rod 12 and penetrates downward through the valve seat 8, the liquid outlet hole 6 and extends into the delivery pipe 7, the extending end of the rod member 20 is fixed with two support plates 21 on the left and right cylindrical surfaces, and a circular cylindrical head 22 is fixed on the front end surface of each support plate 21; the rod member 20, the valve rod 12 and the piston rod of the electric cylinder 3 are coaxially arranged.

[0073] The left and right side walls of the conveying pipe 7 are provided with pull components 23 for pulling the valve core 13, the pull component 23 on the left side includes a blind groove 24 formed on the inner side wall of the conveying pipe 7, a nut 25 fixedly arranged on the left side of the conveying pipe 7 and opposite to the blind groove 24, a pin shaft 26 fixedly arranged between the front and back walls of the blind groove 24, an L-shaped force block 27 rotatably arranged on the pin shaft 26 and located in the blind groove 24, a torsional spring 28 sleeved on the pin shaft 26, and the front and back ends of the torsional spring 28 are fixedly arranged on the back end surface of the L-shaped force block 27 and the back side wall of the blind groove 24 respectively; the two pull components 23 are the same in structure and are symmetrically arranged about the rod 20.

[0074] The short block of the L-shaped force block 27 extends into the conveying pipe 7 and is fixedly arranged with a yoke 29 on the extending end, the U-shaped groove 30 of the yoke 29 is sleeved on the outside of the left circular head 22, the nut 25 is threadedly connected with a screw rod 31, the screw rod 31 extends into the blind groove 24 and is fixedly arranged with an arc-shaped end 32 on the extending end, and the arc-shaped end 32 is opposite to the long block of the L-shaped force block 27. The outside of the screw rod 31 is fixedly arranged with a hand wheel B 36.

[0075] The contact between the valve core 13 and the guide seat 10 is provided with a dynamic sealing element, the valve body 1 and the guide seat 10 are provided with a dynamic sealing element, and the dynamic sealing element plays a sealing role to prevent fluid leakage; the valve rod 12 and the valve cover 9 are provided with a sealing ring, and the sealing ring plays a role of sealing the gap between the valve rod 12 and the valve cover 9.

[0076] The electric cylinder 3 is electrically connected with the controller through a signal line, and the worker can control the retraction or extension of the piston rod of the electric cylinder 3 through the controller, so as to control the lifting of the valve core 13 and further adjust the size of the throttling opening 14.

[0077] A working method of a throttling valve of an electric cylinder control throttling opening, which comprises the following steps:

[0078] S1, the liquid inlet hole 5 of the throttling valve is fixedly installed at the liquid outlet of the flat plate valve; the bottom port of the conveying pipe 7 is fixedly installed in the rear section treatment equipment; the flat plate valve is opened, and the fluid returned and discharged from the well mouth is sequentially conveyed through the liquid inlet hole 5, the cavity 4, the throttling opening 14, the liquid outlet hole 6, the conveying pipe 7, and finally the bottom port of the conveying pipe 7 to the rear section treatment equipment, and the movement direction of the fluid is shown by the solid arrow in Figure 7 ;

[0079] S2, when the pressure of the fluid entering the conveying pipe 7 is to be increased, the specific operation steps of the worker are as follows:

[0080] S21, the worker controls the upward retraction of the piston rod of the electric cylinder 3 through the controller, the piston rod drives the upward movement of the valve rod 12 relative to the stationary compression cylinder 16, the valve rod 12 drives the synchronous upward movement of the valve core 13 and the rod piece 20, wherein the valve core 13 moves along the guide hole 11 to the direction away from the valve seat 8, at the same time, the rod piece 20 also drives the synchronous upward movement of the two supporting plates 21, the supporting plates 21 drive the synchronous upward movement of the circular head 22, the circular head 22 drives the upward movement of the yoke 29, the yoke 29 drives the outward rotation of the L-shaped force block 27 around the axis of the pin shaft 26, at the same time, the L-shaped force block 27 makes the torsional spring 28 deform and twist;

[0081] When the piston rod of the electric cylinder 3 is retracted to the set stroke, the valve core 13 has been moved to the position, as shown in Figure 21 , at this time, the controller controls the electric cylinder 3 to be closed, thereby increasing the throttling opening 14, and further achieving the purpose of increasing the fluid pressure into the delivery pipe 7;

[0082] S22, the worker rotates the hand wheel A35 of the downward pressing assembly by hand, the hand wheel A35 drives the synchronous rotation of the compression cylinder 16, the compression cylinder 16 is screwed down relative to the stationary threaded seat 15, the bottom end of the compression cylinder 16 presses the floating plate 17 downward, the floating plate 17 compresses the spring 19, and also drives the downward movement of each force rod 18 thereon, when the worker can no longer rotate the hand wheel A35 of the downward pressing assembly, the bottom end of each force rod 18 is pressed against the top surface of the valve core 13, as shown in Figure 22 ;

[0083] S23, the worker manually rotates the hand wheel B36 of the left pulling assembly 23, the hand wheel B36 drives the rotation of the screw rod 31, the screw rod 31 drives the movement of the arc-shaped end 32 toward the long block of the L-shaped force block 27, when the worker can no longer rotate the hand wheel B36 of the left pulling assembly 23, the left arc-shaped end 32 is pressed against the long block of the L-shaped force block 27, as shown in Figure 23 , at this time, the left L-shaped force block 27 pulls the left yoke 29 downward, the yoke 29 in turn pulls the corresponding circular head 22 downward, the pulling direction of the circular head 22 is shown by the hollow arrow in Figure 23 , the circular head 22 pulls the rod piece 20 downward, the rod piece 20 pulls the valve rod 12 downward, the valve rod 12 in turn pulls the valve core 13 downward, so that the valve core 13 has a downward movement trend;

[0084] S24, the worker manually rotates the hand wheel B36 of the right pulling assembly 23, when the worker can no longer rotate the hand wheel B36 of the right pulling assembly 23, the right arc-shaped end 32 is pressed against the long block of the L-shaped force block 27, as shown in Figure 24 , at this time, the right L-shaped force block 27 pulls the right yoke 29 downward, the yoke 29 in turn pulls the corresponding circular head 22 downward, the pulling direction of the circular head 22 is shown by the hollow arrow inFigure 24 As shown by the hollow arrow, the circular head 22 pulls down the lever 20, the lever 20 pulls down the valve stem 12, and the valve stem 12 pulls down the valve core 13, so that the valve core 13 has a downward movement tendency.

[0085] In steps S21-S24, when the valve core 13 has been moved to the position, the worker only needs to rotate the hand wheel A35 of the downward pressing assembly first, so that the plurality of force transmission rods 18 are all pressed against the top surface of the valve core 13 to resist the pressure of the fluid acting on the bottom surface of the valve core 13, and then rotate the hand wheels B36 of the left and right pulling assemblies 23 to make the valve core 13 have a downward movement tendency, thereby further resisting the pressure acting on the bottom surface of the valve core 13, so as to finally avoid the pressure acting on the bottom surface of the valve core 13 continuously pushing the valve core 13, which has been moved to the position, upward.

[0086] Therefore, the throttle valve can jointly resist the pressure acting on the bottom surface of the valve core 13 through the cooperation of the downward pressing assembly and the two pulling assemblies 23, thereby effectively avoiding the pressure acting on the bottom surface of the valve core 13 continuously pushing the valve core 13, which has been moved to the position, upward, and further avoiding the continuously increasing throttle opening 14, so as to ensure that the pressure of the fluid entering the delivery pipe 7 does not change, meeting the actual operation requirements, and compared with the electric cylinder type throttle valve as shown in Figures 1-6 , the valve core, which has been moved to the position, can be continuously moved upward, and has the technical characteristics of higher pressure regulating precision.

[0087] S3, when the pressure of the fluid entering the delivery pipe 7 is to be lowered, the worker specifically operates as follows:

[0088] S31, the worker reversely rotates the hand wheel A35 of the downward pressing assembly, and the hand wheel A35 drives the pressing cylinder 16 to rotate upward relative to the stationary threaded seat 15, when the pressing cylinder 16 moves upward, under the elastic restoring force of the compression spring 19, the floating plate 17 moves upward, and the floating plate 17 drives the plurality of force transmission rods 18 to move upward, and the force transmission rods 18 are separated from the valve core 13;

[0089] S32, the worker reversely rotates the hand wheels B36 of the left and right pulling assemblies 23, so that the screw rod 31 moves away from the L-shaped force transmission block 27;

[0090] S33, the worker controls the controller to control the piston rod of the electric cylinder 3 to stretch downward, the piston rod drives the valve rod 12 to move downward relative to the static pressure cylinder 16, the valve rod 12 drives the valve core 13 and the rod piece 20 to move downward synchronously, wherein the valve core 13 moves along the guide hole 11 towards the valve seat 8 direction, at the same time, the rod piece 20 also drives the two support plates 21 to move downward synchronously, the support plate 21 drives the circular head 22 to move downward synchronously, the circular head 22 drives the yoke 29 to move downward;

[0091] When the piston rod of the electric cylinder 3 stretches downward to the set stroke, the controller controls the electric cylinder 3 to close, at this time, the valve core 13 moves to the position, thereby reducing the throttle opening 14, and then achieving the purpose of reducing the fluid pressure entering into the conveying pipe 7.

Claims

1. A throttle valve for controlling throttle opening degree, comprising a valve body (1), a frame (2) and an electric cylinder (3) sequentially fixed on the top of the valve body (1), a liquid inlet hole (5) is arranged on the left end surface of the valve body (1) and communicates with a cavity (4) of the valve body (1), a liquid outlet hole (6) is arranged on the bottom surface of the valve body (1) and communicates with the cavity (4), a delivery pipe (7) is fixed on the bottom surface of the liquid outlet hole (6) and communicates with the liquid outlet hole (6), and a valve seat (8) is fixed in the liquid outlet hole (6); a valve cover (9) is fixed on the top surface of the valve body (1), a guide seat (10) downwardly extending into the cavity (4) is fixed on the bottom surface of the valve cover (9), a guide hole (11) communicating with the cavity (4) is arranged on the bottom surface of the guide seat (10), the piston rod of the electric cylinder (3) downwardly penetrates the top wall of the frame (2), and a valve rod (12) is connected to the extending end of the piston rod, the valve rod (12) downwardly penetrates the bottom wall of the frame (2), the valve cover (9), the guide hole (11) and extends into the cavity (4), a valve core (13) is fixed on the extending end of the valve rod (12), the upper end of the valve core (13) is in sliding fit with the guide hole (11), the lower end of the valve core (13) extends into the valve seat (8), and a throttle opening degree (14) is formed between the valve core (13) and the inner wall of the valve seat (8); characterized in that: a downward pressing assembly for pressing the valve core (13) downwardly is arranged between the frame (2) and the valve cover (9), the downward pressing assembly comprises screw seats (15) fixed between the left and right side walls of the frame (2), a pressing cylinder (16) threadedly connected into the screw seats (15) and sleeved on the outer portion of the valve rod (12), and a floating plate (17) sleeved on the outer portion of the valve rod (12), a plurality of force transmission rods (18) are fixed on the bottom surface of the floating plate (17) and along the circumferential direction of the floating plate (17), the force transmission rods (18) downwardly penetrate the bottom wall of the frame (2), the valve cover (9) and extend into the guide hole (11), the force transmission rods (18) are located directly above the valve core (13), a spring (19) is sleeved on each force transmission rod (18), the upper and lower ends of the spring (19) are fixed on the floating plate (17) and the bottom wall of the frame (2) respectively, and the floating plate (17) is pressed against the bottom surface of the pressing cylinder (16) under the elastic force of the spring (19); a rod member (20) is fixed on the bottom surface of the valve rod (12) and downwardly penetrates the valve seat (8), the liquid outlet hole (6) and extends into the delivery pipe (7), branch plates (21) are fixed on the left and right cylindrical surfaces of the extending end of the rod member (20), and circular cylindrical heads (22) are fixed on the front end surfaces of the two branch plates (21). ​ ​ The left and right side walls of the conveying pipe (7) are provided with pull assemblies (23) for pulling the valve core (13), the pull assembly (23) on the left side comprises a blind groove (24) formed on the inner side wall of the conveying pipe (7), a nut (25) fixedly arranged on the left side of the conveying pipe (7) and opposite to the blind groove (24), a pin shaft (26) fixedly arranged between the front and back walls of the blind groove (24), an L-shaped force block (27) rotatably arranged on the pin shaft (26) and located in the blind groove (24), and a torsional spring (28) sleeved on the pin shaft (26) and fixedly arranged on the rear end face of the L-shaped force block (27) and the rear side wall of the blind groove (24); The short block of the L-shaped force block (27) extends into the conveying pipe (7) and is fixedly provided with a yoke (29) on the extending end, the U-shaped groove (30) of the yoke (29) is sleeved on the outside of the left circular head (22), the nut (25) is threadedly connected with a screw rod (31), the screw rod (31) extends into the blind groove (24) and is fixedly provided with an arc-shaped end (32) on the extending end, and the arc-shaped end (32) is opposite to the long block of the L-shaped force block (27) in the left and right directions.

2. A throttle valve for controlling the throttle opening degree of an electric cylinder according to claim 1, characterized in that: A dynamic sealing element is arranged between the contact position of the valve core (13) and the guide seat (10), and a dynamic sealing element is arranged between the valve body (1) and the guide seat (10); and a sealing ring is arranged between the valve rod (12) and the valve cover (9).

3. A throttle valve for controlling the throttle opening degree of an electric cylinder according to claim 2, characterized in that: An external thread (34) is formed on the outer wall of the pressing cylinder (16), and the external thread (34) of the pressing cylinder (16) is connected with the internal thread of the threaded seat (15); and a hand wheel A (35) is welded on the outer wall of the upper end of the pressing cylinder (16).

4. A throttle valve for controlling the throttle opening degree of an electric cylinder according to claim 3, characterized in that: The force transmission rods (18) are uniformly arranged on the outer edges of the floating plates (17).

5. A cylinder control throttle valve according to claim 4, characterized in that: The rod member (20), the valve rod (12) and the piston rod of the electric cylinder (3) are coaxially arranged.

6. A throttle valve for controlling the throttle opening degree of an electric cylinder according to claim 5, characterized in that: The external portion of the screw rod (31) is fixedly provided with a hand wheel B (36).

7. A throttle valve for controlling the throttle opening degree of an electric cylinder according to claim 6, characterized in that: The two pull assemblies (23) are the same in structure and are symmetrically arranged about the rod member (20).

8. A cylinder control throttle valve according to claim 7, characterized in that: The electric cylinder (3) is electrically connected with the controller through signal lines.

9. A method of operating a throttle valve for controlling the throttle opening degree by using the electric cylinder for controlling the throttle opening degree according to claim 8, characterized by: It comprises the following steps: S1, the liquid inlet hole (5) of the throttle valve is fixedly installed at the liquid outlet of the flat plate valve, the bottom port of the conveying pipe (7) is fixedly installed in the rear section processing equipment, the flat plate valve is opened, and the fluid returned and discharged from the well mouth is sequentially conveyed through the liquid inlet hole (5), the cavity (4), the throttling opening (14), the liquid outlet (6), the conveying pipe (7), and finally the bottom port of the conveying pipe (7) to the rear section processing equipment; S2, when the pressure of the fluid entering the conveying pipe (7) is to be increased, the specific operation steps of the worker are as follows: S21, the worker controls the electric cylinder (3) through the controller, and the piston rod is retracted upwards. The piston rod drives the valve rod (12) to move upwards relative to the stationary compression cylinder (16). The valve rod (12) drives the valve core (13) and the rod (20) to move upwards synchronously. The valve core (13) moves along the guide hole (11) away from the valve seat (8). Meanwhile, the rod (20) also drives the two supporting plates (21) to move upwards synchronously. The supporting plates (21) drive the circular head (22) to move upwards synchronously. The circular head (22) drives the fork (29) to move upwards. The fork (29) drives the L-shaped force block (27) to rotate outward around the axis of the pin shaft (26). Meanwhile, the L-shaped force block (27) causes the torsional spring (28) to be deformed and twisted; When the piston rod of the electric cylinder (3) is retracted upwards to the set stroke, the valve core (13) has been moved to the position. At this time, the controller controls the electric cylinder (3) to be closed, thereby increasing the throttling opening (14), and further achieving the purpose of increasing the pressure of the fluid entering the delivery pipe (7); S22, the worker rotates the hand wheel A (35) of the downward pressing assembly by hand. The hand wheel A (35) drives the compression cylinder (16) to rotate synchronously. The compression cylinder (16) is screwed downwards relative to the stationary threaded seat (15). The bottom end of the compression cylinder (16) presses the floating plate (17) downwards. The floating plate (17) compresses the spring (19) and also drives the force rods (18) on it to move downwards. When the worker can no longer rotate the hand wheel A (35) of the downward pressing assembly, the bottom end of each force rod (18) abuts against the top surface of the valve core (13); S23, the worker rotates the hand wheel B (36) of the left pulling assembly (23) by hand. The hand wheel B (36) drives the screw rod (31) to rotate. The screw rod (31) drives the arc-shaped end (32) to move towards the long block of the L-shaped force block (27). When the worker can no longer rotate the hand wheel B (36) of the left pulling assembly (23), the left arc-shaped end (32) abuts against the long block of the L-shaped force block (27). At this time, the left L-shaped force block (27) pulls the left fork (29) downwards. The fork (29) in turn pulls the corresponding circular head (22) downwards. The circular head (22) pulls the rod (20) downwards. The rod (20) pulls the valve rod (12) downwards. The valve rod (12) in turn pulls the valve core (13) downwards, so that the valve core (13) has a downward movement trend; S24, the worker rotates the hand wheel B (36) of the right pulling assembly (23) by hand. When the worker can no longer rotate the hand wheel B (36) of the right pulling assembly (23), the right arc-shaped end (32) abuts against the long block of the L-shaped force block (27). At this time, the right L-shaped force block (27) pulls the right fork (29) downwards. The fork (29) in turn pulls the corresponding circular head (22) downwards. The circular head (22) pulls the rod (20) downwards. The rod (20) pulls the valve rod (12) downwards. The valve rod (12) in turn pulls the valve core (13) downwards, so that the valve core (13) has a downward movement trend; S3, when the pressure of the fluid into the delivery pipe (7) is to be reduced, the worker specifically operates as follows: S31, the worker reversely rotates the hand wheel A (35) of the pressing assembly, the hand wheel A (35) drives the pressing cylinder (16) to rotate upward relative to the stationary threaded seat (15), when the pressing cylinder (16) moves upward, the floating plate (17) moves upward under the elastic restoring force of the compression spring (19), the floating plate (17) drives the plurality of force transmission rods (18) to move upward, the force transmission rods (18) are separated from the valve core (13); S32, the worker reversely rotates the hand wheel B (36) of the left pulling assembly (23) and the hand wheel B (36) of the right pulling assembly (23), so that the screw rod (31) moves away from the L-shaped force transmission block (27); S33, the worker controls the piston rod of the electric cylinder (3) to extend downward through the controller, the piston rod drives the valve rod (12) to move downward relative to the stationary pressing cylinder (16), the valve rod (12) drives the valve core (13) and the rod (20) to move downward synchronously, wherein the valve core (13) moves along the guide hole (11) toward the valve seat (8), at the same time, the rod (20) drives the two supporting plates (21) to move downward synchronously, the supporting plates (21) drive the circular head (22) to move downward synchronously, the circular head (22) drives the yoke (29) to move downward; When the piston rod of the electric cylinder (3) extends downward to the set stroke, the controller controls the electric cylinder (3) to be closed, at this time, the valve core (13) is in place, thereby reducing the throttling opening (14), and the purpose of reducing the pressure of the fluid into the delivery pipe (7) is achieved.

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