A sand control throttle valve

Abstract

A sand control throttle valve relates to the technical field of throttle valves used in offshore oil production platforms, comprising: a valve body defining an inlet and an outlet; an inner cage sleeve which is tubular and fixedly connected to the valve body, the inner cage sleeve being provided with a plurality of throttling holes penetrating its side wall; an outer cage sleeve which has an upper opening and is engaged with the inner cage sleeve, the bottom of the outer cage sleeve being provided with a bottom hole penetrating its bottom wall; a sliding sleeve which is slidably connected to the valve body up and down, the upper side of the sliding sleeve being provided with a sand containing groove which is connected with the bottom hole; a pressure balancing chamber being formed at the lower side of the sliding sleeve; and a sand discharge structure, the sand discharge structure comprising an intake ring assembly and an exhalation ring assembly arranged at the bottom of the sand containing groove; the intake ring assembly is arranged to allow a unidirectional flow of fluid from the sand containing groove to the pressure balancing chamber; the exhalation ring assembly is arranged to allow a unidirectional flow of fluid from the pressure balancing chamber to the sand containing groove, and the sand control throttle valve has the functions of sand control and automatic sand discharge.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a sand prevention throttle valve used in an offshore oil production platform. Background Art

[0002] As a necessary control equipment for oil and gas production in high-pressure oil and gas wells, the throttle valve mainly plays the role of regulating fluid flow, pressure and flow direction to ensure safe and stable operation of the system.

[0003] Due to the tight space constraints of offshore drilling platforms (mainly to avoid interference between the actuators of each valve and facilitate operation), it is often necessary to install the throttle valve upside down on site, such as Figure 1 As shown, the hand wheel of the throttle valve is located on the lower side of the valve body. During gas extraction operations, there will be a small amount of impurities / solid particles in the gas. When the throttle valve is used inverted, most of the impurities / solid particles will be carried away by the very high-speed airflow, but there will still be occasional individual particles that will enter the cavity where the packing 90' is located through the pressure balance channel 421' and slowly accumulate. When the valve stem 43 moves up and down, particles are easily brought into the packing 90' and easily scratch the sealing surface of the packing 90', which will cause leakage and lead to valve failure. Summary of the invention

[0004] The present invention aims at the above technical problems existing in the prior art and provides a sand prevention throttle valve which has a sand prevention function when used in an inverted manner.

[0005] In order to achieve the above technical objectives, an embodiment of the present invention provides a sand control throttle valve, comprising:

[0006] A valve body defining an inlet and an outlet;

[0007] An inner cage sleeve which is tubular and fixedly connected to the valve body, wherein the inner cage sleeve is provided with a plurality of throttling holes penetrating through its side wall;

[0008] An outer cage sleeve having an upper opening and buckled with the inner cage sleeve, wherein the bottom of the outer cage sleeve is provided with a bottom hole penetrating through the bottom wall thereof;

[0009] A sliding sleeve connected to the valve body in an upward and downward sliding manner, wherein a sand containing groove connected to the bottom hole is provided on the upper side of the sliding sleeve; a pressure balancing chamber is formed on the lower side of the sliding sleeve; and

[0010] A sand discharge structure, comprising an inhalation ring assembly and an exhalation ring assembly arranged at the bottom of the sand containing tank; the inhalation ring assembly is configured to allow a one-way flow of fluid from the sand containing tank to the pressure balance chamber; the exhalation ring assembly is configured to allow a one-way flow of fluid from the pressure balance chamber to the sand containing tank.

[0011] In some embodiments, the upper portion of the sliding sleeve is provided with a countersunk portion formed inwardly from the upper end surface of the sliding sleeve for the outer cage sleeve to be embedded;

[0012] A grease chamber is provided at the bottom of the counterbore; a protrusion is provided between the grease chamber and the sand tank and extends upward for a certain length; and a discharge hole is provided on the protrusion that penetrates the wall thereof;

[0013] The discharge hole is communicated with the sand containing tank through the exhalation coil assembly.

[0014] In some embodiments, the suction ring assembly is located between a top surface of the protrusion and a bottom surface of the outer cage.

[0015] In some embodiments, the suction ring assembly includes a suction ring body and a first sealing ring, an annular sealing cavity is formed on the inner contour of the suction ring body, and a first sealing portion with an annular shape and a trapezoidal groove cross section is provided on the side of the sealing cavity away from the center of the suction ring assembly; the groove bottom width of the first sealing portion is smaller than the groove width; the first sealing ring is located in the sealing cavity;

[0016] The suction ring body comprises a suction ring inlet hole for connecting the groove bottom of the first sealing part with the sand containing groove, and a suction ring outlet hole for connecting the groove opening of the first sealing part with the grease containing groove.

[0017] In some embodiments, the port connecting the suction ring inlet hole and the sand containing tank is located at the notch position of the sand containing tank;

[0018] The port is formed as a gap between the suction ring body and the bottom surface of the outer cage.

[0019] In some embodiments, an annular retaining ring is provided on the central side of the sealing cavity close to the suction ring body.

[0020] In some embodiments, the call ring assembly includes a call ring body and a second sealing ring; the outer contour of the call ring body is provided with a receiving groove which is annularly arranged around the entire circumference of the call ring body;

[0021] A second sealing portion is provided on the central side of the receiving groove close to the call ring body, the cross section of the second sealing portion is a trapezoidal groove, and the groove width of the second sealing portion is greater than the groove bottom width;

[0022] The second sealing ring is located in the receiving groove;

[0023] The ring body has a ring inlet hole connecting the groove bottom of the second sealing part with the discharge hole, and a ring outlet hole connecting the notch of the second sealing part with the sand containing groove.

[0024] In some embodiments, the valve cover is provided with a grease injection hole connected to the pressure balance chamber, and the outer port of the grease injection hole is provided with a grease injection one-way valve that limits the grease to flow only in one direction from the outer port of the grease injection hole to the pressure balance chamber.

[0025] In some embodiments, the lower end of the sliding sleeve is connected to the valve stem, and a dust removal ring is provided between the valve stem and the valve cover; a wedge-shaped acute-angle structure that protrudes upward and is inclined is provided at the contact point between the dust removal ring and the valve stem.

[0026] In some embodiments, a pressure balance hole is provided on the sliding sleeve, one end of the pressure balance hole is communicated with the accommodating cavity, and the other end of the pressure balance hole is communicated with the pressure balance cavity.

[0027] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0028] When the sand-proof throttle valve provided in the embodiment of the present invention is used inverted, the sand containing groove provided therein can temporarily store the sand particles entering the balance channel; and as the valve stem moves downward or grease is injected into the pressure balance chamber, the sand particles temporarily stored in the sand containing groove can be discharged into the flow path of the throttle valve, thereby playing a sand-proof role.

[0029] Specifically, when the valve stem assembly moves upward, the fluid in the outer cage flows down along the bottom hole of the outer cage and along the gap, and enters the grease chamber through the suction ring assembly. In the above process, the sand particles in the fluid sink into the sand tank under the action of gravity, playing a role in preventing sand.

[0030] When the valve stem assembly moves downward, the sliding sleeve squeezes the pressure balance chamber on its lower side, and the grease in the pressure balance chamber moves upward through the pressure balance hole and enters the grease chamber, and further enters the sand chamber through the exhalation ring assembly, and carries the sand in the sand chamber through the bottom hole and is discharged into the inner cavity of the outer cage sleeve. The above sand will be discharged from the throttle valve along with the fluid, thereby playing a sand discharge role. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural diagram and a partial enlarged diagram of the throttle valve used in an inverted manner.

[0032] Figure 2 It is a schematic diagram of the structure of the valve stem assembly of the throttle valve.

[0033] Figure 3 Schematic diagram of the process of sealing grease being discharged and blown away in the throttle valve.

[0034] Figure 4 It is a schematic structural diagram of a sliding sleeve in a sand control throttle valve according to an embodiment of the present invention.

[0035] Figure 5It is a structural schematic diagram and a partial enlarged diagram of a valve stem assembly in a sand control throttling valve according to an embodiment of the present invention.

[0036] Figure 6 It is a structural schematic diagram of a suction ring assembly in a sand control throttle valve according to an embodiment of the present invention;

[0037] Figure 7 It is a structural schematic diagram of an exhalation ring assembly in a sand control throttle valve according to an embodiment of the present invention;

[0038] Figure 8 It is a principle schematic diagram of the upward movement process of the valve stem assembly in the sand control throttle valve according to one embodiment of the present invention;

[0039] Fig. 9 It is a principle schematic diagram of the downward movement process of the valve stem assembly in the sand control throttle valve according to one embodiment of the present invention;

[0040] Fig.10 It is a structural schematic diagram and a partial enlarged diagram of the packing in a sand control throttle valve according to an embodiment of the present invention.

[0041] Description of Reference Numerals

[0042] 10. Valve body; 11. Inlet; 12. Outlet; 13. Valve cavity; 14. Inlet flange; 15. Sealing ring; 16. Outlet flange; 17, 18. Arrow; 19. Grease injection hole; 191. Grease injection check valve; 20. Handwheel; 22. Threaded sleeve; 24. Bearing; 26. Radial protrusion; 28. Valve cover; 281. Pressure balance chamber; 30. Inner cage; 31. Throttle hole; 32. Control assembly; 34. Bolt; 36. Nut; 38. Seal; 40, 40', valve stem assembly; 41. Outer cage; 411. Bottom hole; 42, 42', sliding sleeve; 421, 421', pressure balance hole; 422, sinker Hole portion, 423, sand containing groove; 425, protrusion; 426, discharge hole; 428, grease containing cavity; 43, valve stem; 44, gap; 50, suction ring assembly; 51, suction ring body; 511, suction ring inlet hole; 512, containing cavity; 513, suction ring outlet hole; 514, first sealing portion; 52, first sealing ring; 53, retaining ring; 60, exhalation ring assembly; 61, exhalation ring body; 611, exhalation ring inlet hole; 612, containing groove; 613, exhalation ring outlet hole; 614, second sealing portion; 62, second sealing ring; 70, grease; 80, sand; 90, packing; 91, dust removal ring; 911, wedge-shaped acute-angle structure. DETAILED DESCRIPTION

[0043] Other objects and advantages of the present invention will become apparent through explanation of the following preferred embodiments of the present application.

[0044] Figure 1 Schematic diagram of the structure of a throttle valve used in an inverted manner. Figure 2 It is a schematic diagram of the structure of the valve stem assembly of the throttle valve.

[0045] The throttle valve may include a valve body 10 and a valve cover 28, wherein the valve cover 28 is connected to the valve body 10, and the control assembly 32 is located at the lower side of the valve body 10. The upper end of the valve stem assembly 40' passes through the central hole of the valve cover 28 and extends into the internal valve cavity 13 of the valve body 10. The control assembly 32 is connected to the lower end of the valve stem assembly 40' and is used to drive the valve stem assembly 40' to move up and down.

[0046] For the sake of clarity, the following descriptions of the directions "up" and "down" refer to Figure 1 The direction is marked by the arrow on the lower left.

[0047] The valve body 10 may include an inlet flange 14 and an outlet flange 16, which are usually connected to similar flanges of another valve, or pipeline flanges, or wellhead flanges. The valve body 10 includes a flow channel, which includes an inlet 11 and an outlet 12. Arrows 17 and 18 show the flow direction of the fluid through the valve body 10.

[0048] The valve cover 28 can be connected to the valve body 10 by, for example, bolts 34 and nuts 38. One or more seals 38 can be provided where the valve body 10 contacts the valve cover 28 to prevent fluid from leaking from the throttle valve.

[0049] The control assembly 32 may include, for example, a threaded sleeve 22 and an actuator. The threaded sleeve 22 has an internal thread connected to the valve stem assembly 40'. The threaded sleeve 22 is rotatably connected to the valve cover 28. When the threaded sleeve 22 rotates, it can drive the valve stem assembly 40' to move up and down. The actuator may be, for example, Figure 1 The hand wheel 20 shown in the figure, the actuator is connected to the lower end of the threaded sleeve 22 to actuate the throttle valve. The actuator can also be a pneumatic, hydraulic, electric, manual knob or handle type actuator.

[0050] A radial protrusion 26 is provided on the outer side of the threaded sleeve 22 , and bearings 24 are provided on the upper side and the lower side of the radial protrusion 26 , respectively. The bearings 24 are used to support the threaded sleeve 22 so that the threaded sleeve 22 can rotate relative to the valve cover 28 .

[0051] Figure 2 It is a schematic diagram of the structure of the valve stem assembly of the throttle valve.

[0052] like Figure 2As shown, the valve stem assembly 40' may include a sleeve 42' and a valve stem 43, and the upper end of the valve stem 43 is threadedly connected to the sleeve 42'. The upper end surface of the sleeve 42' is concave to form a countersunk portion 422 for embedding the outer cage sleeve 41. The outer cage sleeve 41 is in a hollow cup shape, and has an opening at its upper end. The bottom of the outer cage sleeve 41 is provided with a bottom hole 411 that connects its inner cavity and the lower space. In this embodiment, the sleeve 42' also has a pressure balance hole 421' corresponding to the above-mentioned bottom hole 411, and the pressure balance hole runs through the sleeve 42'.

[0053] refer to Figure 1 In one embodiment, the throttle valve further comprises an inner cage 30, which is generally tubular and has a plurality of throttle holes extending through the side wall thereof. In another embodiment, the throttle holes have a plurality of different apertures. The inner cage 30 is embedded in the outer cage 41, and the flow area of ​​the throttle valve is adjusted by adjusting the throttle holes on the inner cage 30 that are closed by the outer cage 41, thereby achieving a throttling effect.

[0054] Refer to Figure 1 and Figure 2 As shown, an annular pressure balance chamber 281 for containing grease is formed between the inner cavity of the valve cover 28 and the valve stem 43. A sealing ring 15 is provided between the sliding sleeve 42 and the valve cover 28, and a packing 90 is provided between the valve cover 28 and the valve stem 43, and the pressure balance chamber 281 is located between the sealing ring 15 and the packing 90. The pressure balance chamber 281 is connected to the pressure balance hole 421'. The pressure balance hole 421' is used to connect the spaces on the upper and lower sides of the sliding sleeve 42', to balance the pressure on the upper and lower sides of the sliding sleeve 42', and to reduce the resistance generated by the fluid pressure acting on the upper end surface of the outer cage 41 and the sliding sleeve 42' when the valve stem assembly 40' in the throttle valve is driven by the actuator to move up and down. If the above-mentioned pressure balance hole 421' and pressure balance chamber 281 are not provided, when the throttle valve is working, only the upper end surface of the outer cage 41 and the sliding sleeve 42' is subjected to the pressure of the fluid, resulting in excessive load torque when the actuator drives the valve stem assembly 40', and it becomes very difficult to operate the throttle valve.

[0055] However, when the throttle valve is used upside down, a small amount of impurities such as sand particles in the fluid may enter the pressure balance chamber 281 through the pressure balance hole 421 ′, which may easily cause scratches and damage to the packing 90 after a long period of accumulation.

[0056] Figure 3 Schematic diagram of the process of sealing grease being discharged and blown away in the throttle valve.

[0057] If grease 70 is simply injected into the pressure balance chamber 281, Figure 3As shown in (a) to (b), when the sliding sleeve 42' moves downward, the grease 70 in the pressure balance chamber 281 is squeezed, causing the grease 70 to enter the inner cavity of the outer cage 41 through the pressure balance hole 421'. Figure 3 As shown in (c), when the throttle valve is working, the grease entering the inner cavity of the outer cage 41 is quickly blown away by the fluid. Therefore, after the throttle valve is operated many times, the grease in the pressure balance chamber 281 is completely discharged, and impurities such as sand particles can easily enter the pressure balance chamber 281.

[0058] Figure 4 It is a schematic structural diagram of a sliding sleeve in a sand control throttle valve according to an embodiment of the present invention. Figure 5 It is a schematic structural diagram of a valve stem assembly in a sand control throttling valve according to an embodiment of the present invention.

[0059] like Figure 4 and Figure 5 As shown, in order to solve the above technical problems, the present application provides a sand containing groove 423 in the sliding sleeve 42, the opening of the sand containing groove 423 is upward, and is connected with the bottom hole 411 provided at the lower end of the outer cage 41. In one embodiment, the sand containing groove 423 is configured as a ring structure with an open upper end, and the bottom hole 411 at the bottom of the outer cage 41 can be one or more. When there are multiple bottom holes 411, they can be evenly arranged around the central axis A of the outer cage 41. Sand particles are first deposited in the sand containing groove 423 through the above bottom hole 411, and will not directly enter the pressure balance hole 421.

[0060] However, only providing the sand containing groove 423 may cause the following problem: after the throttle valve has been operating for a long time, sand particles may be deposited in the sand containing groove 423 and cannot be discharged, causing the sand containing groove 423 to fail.

[0061] In order to further solve the above technical problems, the inventor of the present application creatively designed a sand discharge structure after in-depth thinking and repeated experiments. The valve stem assembly 40 includes a sleeve 42 and a valve stem 43. Specifically, as Figure 4 and Figure 5 As shown, in one embodiment, a protrusion 425 is provided on the radial inner side of the annular sand containing groove 423, and the protrusion 425 extends upward along the axial direction for a section. The protrusion 425 is also annular, and a fat containing cavity 42 is formed in the middle of the protrusion 425. The pressure balance hole 421 is connected with the fat containing cavity 428. An inhalation coil assembly 50 is provided on the upper side of the protrusion 425, and an exhalation coil assembly 60 is installed at the bottom of the sand containing groove 423. A discharge hole 426 penetrating the protrusion 425 is provided on the wall of the protrusion 425.

[0062] Figure 6 FIG. 5 is a schematic structural diagram of a suction ring assembly 50 in a sand control throttle valve according to an embodiment of the present invention.

[0063] like Figure 6 As shown, in one embodiment, the suction ring assembly 50 includes a suction ring body 51 and a first sealing ring 52. The suction ring body 51 may have an annular structure, for example, and an annular first sealing portion 514 having a trapezoidal groove cross section is formed on the inner contour of the suction ring body 51. The groove bottom width of the first sealing portion 514 is smaller than the groove opening width, and the groove opening of the first sealing portion 514 faces the center direction of the suction ring body 51.

[0064] A suction ring inlet hole 511 is provided in the suction ring body 51. One end of the suction ring inlet hole 511 is connected to the groove bottom of the first sealing portion 514, and the other end of the suction ring inlet hole 511 extends radially outward and upward to the upper end surface of the suction ring body 51. Figure 5 A gap 44 is formed between the upper end surface of the suction ring body 511 and the lower end surface of the outer cage 41. The gap 44 has a higher height position relative to the sand containing groove 423, and sand particles are more likely to be deposited in the sand containing groove 423 under the action of gravity; and the shape of the gap 44 can also play a certain filtering role.

[0065] A suction ring outlet hole 513 is provided at the lower end of the suction ring body 51 . The upper end of the suction ring outlet hole 513 is communicated with the cavity where the first sealing portion 514 is located, and the other end of the suction ring outlet hole 513 extends downward to the lower end surface of the suction ring body 51 .

[0066] A first sealing ring 52 is placed at the first sealing portion 514 , and the first sealing ring 52 is used to close the suction ring inlet hole 511 when the fluid pressure of the suction ring outlet hole 513 is higher than the fluid pressure of the suction ring inlet hole 511 , and to open the suction ring inlet hole 511 when the fluid pressure of the suction ring inlet hole 511 is higher than the fluid pressure of the suction ring outlet hole 513 .

[0067] A retaining ring 53 is further provided on the radial inner side of the first sealing ring 52, and the retaining ring 53 and the first sealing portion 514 enclose the accommodating cavity 512. The retaining ring 53 is also annular, and is used to provide radial support for the first sealing ring 52 when the first sealing ring 52 opens the suction ring inlet hole 511, so as to prevent it from escaping from the accommodating cavity 512.

[0068] Figure 7 It is a schematic structural diagram of an exhalation ring assembly in a sand control throttle valve according to an embodiment of the present invention.

[0069] like Figure 7As shown, in one embodiment, the call ring assembly 60 includes a call ring body 61 and a second sealing ring 62. The call ring body 61 is annular, and the outer contour of the call ring body 61 is provided with a receiving groove 612, and the receiving groove 612 is arranged around the entire circumference of the call ring assembly 60. A second sealing portion 614 is provided on the central side of the receiving groove 612 close to the call ring body 61. The longitudinal section of the second sealing portion 614 (the section cut by the plane passing through the center line of the call ring body 61) is a trapezoidal groove, and the width of the groove is greater than the width of the groove bottom. The second sealing ring 62 is located in the second sealing portion 614.

[0070] A plurality of call coil inlet holes 611 are provided in the call coil body 61, and the call coil inlet holes 611 extend substantially along the radial direction of the call coil body 61, one end of the call coil inlet hole 611 is communicated with the second sealing portion 614, and the other end extends radially inward and extends to the inner contour of the call coil body 61. When the call coil assembly 60 is installed in the sand containing groove 423, the call coil inlet hole 611 can correspond to and communicate with the discharge hole 426 on the sliding sleeve 42.

[0071] The call ring body 61 is also provided with a plurality of call ring outlet holes 613. The upper side wall of the call ring body 61 is provided with a call ring outlet hole 613 penetrating the side wall. When the call ring assembly 60 is installed in the sand tank 423, the call ring outlet hole 613 can face the notch direction of the sand tank 423.

[0072] Figure 8 The figure is a schematic diagram of the principle of the upward movement process of the valve stem assembly in the sand control throttle valve according to one embodiment of the present invention.

[0073] like Figure 8 As shown, when the valve stem assembly 40 moves upward, the fluid in the outer cage 41 flows down along the bottom hole 411 of the outer cage 41 and enters the fat containing chamber 428 along the gap 44 and the suction ring assembly 50. In the above process, the sand particles in the fluid sink into the sand containing groove 423 under the action of gravity. At this time, the exhalation ring assembly 60 is in a closed state under the action of fluid pressure.

[0074] Fig. 9 The figure is a schematic diagram of the principle of the downward movement process of the valve stem assembly in the sand control throttle valve according to one embodiment of the present invention.

[0075] like Fig. 9As shown, when the valve stem assembly 40 moves downward, the sliding sleeve 42 squeezes the pressure balance chamber 281 on its lower side, and the grease in the pressure balance chamber 281 moves upward through the pressure balance hole 421 and enters the grease chamber 428, and further enters the sand holding groove 423 through the exhalation ring assembly 60, and carries the sand in the sand holding groove 423 through the bottom hole 411 and is discharged to the inner cavity of the outer cage sleeve 41, and the discharged sand will be discharged from the throttle valve along with the fluid in the flow channel of the sand control throttle valve. At this time, under the action of the fluid pressure, the suction ring assembly 50 is in a closed state.

[0076] Fig.10 FIG. 1 is a schematic structural diagram of a packing 90 in a sand control throttle valve according to an embodiment of the present invention.

[0077] like Fig.10 As shown, in one embodiment, the valve cover 28 further includes a grease injection hole 19 connected to the pressure balance chamber 281, and the outer end of the grease injection hole 19 is provided with a grease injection check valve 191. Injecting grease into the valve body 10 through the grease injection check valve 191 can also play a role in sand removal. The principle is similar to the downward movement process of the valve stem assembly 40, which will not be repeated.

[0078] In addition, in one embodiment, the dust removal ring 91 of the packing 90 is improved, and a wedge-shaped acute angle structure 911 that protrudes upward and tilts is provided at the contact point between the dust removal ring 91 and the valve stem 43. When sand particles fall into the pressure balance chamber 281, the wedge-shaped acute angle structure 911 can reduce or prevent the sand particles from scratching the valve stem 43.

[0079] The device of the present application is described in detail with reference to the preferred technical solution of the present application. However, it should be noted that, without departing from the spirit of the present application, those skilled in the art may make any transformation, modification and change based on the above disclosure. The present application includes the above specific embodiments and any equivalent forms thereof.

Claims

1. A sand control throttle valve, characterized in that: include: A valve body defining an inlet and an outlet; A valve cover connected to the valve body; An inner cage sleeve which is tubular and fixedly connected to the valve body, wherein the inner cage sleeve is provided with a plurality of throttling holes penetrating through its side wall; An outer cage sleeve having an upper opening and buckled with the inner cage sleeve, wherein the bottom of the outer cage sleeve is provided with a bottom hole penetrating through the bottom wall thereof; A sliding sleeve connected to the valve body in an upward and downward sliding manner, wherein a sand containing groove connected to the bottom hole is provided on the upper side of the sliding sleeve; a pressure balancing chamber is formed on the lower side of the sliding sleeve; and A sand discharge structure, comprising an inhalation ring assembly and an exhalation ring assembly arranged at the bottom of the sand containing tank; the inhalation ring assembly is configured to allow a one-way flow of fluid from the sand containing tank to the pressure balance chamber; the exhalation ring assembly is configured to allow a one-way flow of fluid from the pressure balance chamber to the sand containing tank.

2. The sand control throttle valve according to claim 1, characterized in that: The upper part of the sliding sleeve is provided with a countersunk hole portion which is formed inwardly from the upper end surface of the sliding sleeve and is used for the outer cage sleeve to be embedded; A fat containing cavity is provided at the bottom of the counterbore; a ring-shaped protrusion extending upward is provided between the fat containing cavity and the sand containing groove; and a discharge hole penetrating through the wall of the protrusion is provided on the protrusion; The discharge hole is communicated with the sand containing tank through the exhalation coil assembly.

3. The sand control throttle valve according to claim 2, characterized in that: The suction ring assembly is located between the top surface of the protrusion and the bottom surface of the outer cage sleeve.

4. The sand control throttle valve according to claim 2, characterized in that: The suction ring assembly comprises a suction ring body and a first sealing ring, an annular sealing cavity is formed on the inner contour of the suction ring body, and a first sealing portion having an annular shape and a trapezoidal groove cross section is provided on the sealing cavity away from the center of the suction ring assembly; the groove bottom width of the first sealing portion is smaller than the groove width; the first sealing ring is located in the sealing cavity; The suction ring body comprises a suction ring inlet hole for connecting the groove bottom of the first sealing part with the sand containing groove, and a suction ring outlet hole for connecting the groove opening of the first sealing part with the grease containing groove.

5. The sand control throttle valve according to claim 4, characterized in that: The port where the suction ring inlet hole is connected to the sand containing tank is located at the notch position of the sand containing tank; The port is formed as a gap between the suction ring body and the bottom surface of the outer cage.

6. The sand control throttle valve according to claim 4, characterized in that: An annular retaining ring is arranged on the central side of the sealing cavity close to the suction ring body.

7. The sand control throttle valve according to claim 2, characterized in that: The call ring assembly comprises a call ring body and a second sealing ring; the outer contour of the call ring body is provided with a ring-shaped receiving groove arranged around the entire circumference of the call ring body; A second sealing portion is provided on the central side of the receiving groove close to the call ring body, the cross section of the second sealing portion is a trapezoidal groove, and the width of the groove of the second sealing portion is greater than the width of the groove bottom; The second sealing ring is located in the receiving groove; The ring body has a ring inlet hole connecting the groove bottom of the second sealing part with the discharge hole, and a ring outlet hole connecting the notch of the second sealing part with the sand containing groove.

8. The sand control throttle valve according to claim 7, characterized in that: The valve cover is provided with a grease injection hole connected to the pressure balance chamber, and the outer port of the grease injection hole is provided with a grease injection one-way valve that limits the grease to flow only in one direction from the outer port of the grease injection hole to the pressure balance chamber.

9. The sand control throttle valve according to claim 1, characterized in that: The lower end of the sliding sleeve is connected to the valve stem, and a dust removal ring is provided between the valve stem and the valve cover; a wedge-shaped acute angle structure that is inclined and protrudes upward is provided at the contact point between the dust removal ring and the valve stem.

10. The sand control throttle valve according to claim 2, characterized in that: The sliding sleeve is provided with a pressure balance hole, one end of the pressure balance hole is communicated with the grease containing cavity, and the other end of the pressure balance hole is communicated with the pressure balance cavity.

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