An adjustable fixed throttle valve

Abstract

The present invention belongs to the technical field of throttle valves, and specifically relates to an adjustable fixed throttle valve, which includes a valve body, a nozzle assembly and a valve seat assembly; the valve seat assembly includes an annular slide, a liquid through hole, a blocking block and a mounting block; the nozzle assembly includes an annular slide, a slag outlet and a plurality of nozzle holes; the liquid through hole is provided through the annular slide, the plurality of nozzle holes are located in the annular slide, and the size of each nozzle hole is different; the liquid through hole coincides with the corresponding nozzle hole; a blocking block and a mounting block are arranged on the annular slide, and the annular slide is located in the annular slide and rotates. The brush on the main brush plate contacts the inner wall of the annular slide through the filter plate, and at the same time, as the valve seat assembly rotates, the brush plate cleans the groove wall of the annular slide, and then squeezes the oil and the debris particles immersed in the oil into the slag outlet through the pressure plate, so as to avoid the friction between the liquid through hole and the debris particles inside the annular slide when the valve seat assembly rotates, resulting in damage to the valve seat assembly and the nozzle assembly.

Description

Technical Field

[0001] The invention belongs to the technical field of throttle valves, and in particular relates to an adjustable fixed throttle valve. Background Art

[0002] The throttle valve is a core component used in the throttling pipeline of the well control device in the oil and gas industry. Its main function is to maintain a certain casing pressure by opening and closing it when implementing the oil and gas well pressure control technology, so as to stabilize the bottom hole pressure change within a certain narrow range.

[0003] There are two types of throttle valves: adjustable throttle valves and fixed throttle valves. The adjustable throttle valve adjusts the size of the throttle nozzle opening area by turning the hand wheel to drive the valve stem forward and backward to achieve the purpose of controlling and regulating production. The fixed throttle valve achieves the purpose of controlling and regulating production by changing the nozzle size. Fixed throttle valves are widely used due to their simple structure and high cost-effectiveness. However, fixed throttle valves need to change the diameter by changing the nozzle, which reduces their efficiency.

[0004] The applicant has retrieved some prior art that can change the caliber by rotating the oil nozzle, for example, patent publication number CN220118674U, which mainly replaces the oil nozzle inside the fixed throttle valve by rotating the oil nozzle assembly. However, during the process of rotating and switching the oil nozzle, the oil nozzle is in a blocked state, and the oil is easy to penetrate into the gap of the oil nozzle, which in turn causes carbon residue and other dirt in the oil to enter the gap of the oil nozzle and accumulate inside the gap. Therefore, when the oil nozzle rotates, the oil nozzle will rub against the carbon residue and other dirt, which is easy to damage the oil nozzle. Summary of the invention

[0005] The purpose of the present invention is to provide an adjustable fixed throttle valve to solve the technical problems in the prior art in view of the shortcomings of the prior art.

[0006] The object of the present invention can be achieved through the following technical solutions: an adjustable fixed throttle valve, which includes a valve body, a flange is installed on one side of the valve body, the flange fixes the oil nozzle assembly in the valve body through an alloy bushing and a sealing gasket, a valve cover is installed on the other side of the valve body, the valve cover fixes the valve stem in the valve body through a bearing gland and a needle bearing, the valve stem is connected to an electric actuator, the end of the valve stem is connected to the valve seat assembly through a connecting sleeve, and the valve seat assembly is located on the oil nozzle assembly and rotates;

[0007] The valve seat assembly includes an annular slide, a liquid through hole, a blocking block and a mounting block, and the oil nozzle assembly includes an annular slide, a slag discharge port and a plurality of oil nozzle holes. The liquid through hole is provided through the annular slide, and the plurality of oil nozzle holes are located in the annular slide, and the size of each oil nozzle hole is different. The liquid through hole coincides with the corresponding oil nozzle hole. The blocking block and the mounting block are arranged on the annular slide, and the annular slide is located in the annular slide and rotates;

[0008] The blocking block blocks the oil nozzle hole that does not overlap with the liquid hole. A circular cavity and a special-shaped cavity are respectively installed in the blocking block and the mounting block. The circular cavity is connected to the special-shaped cavity. A brush plate and a pressure plate are respectively sealed and slidably installed on the circular cavity and the special-shaped cavity. The slag discharge port is located in the annular chute, and the slag discharge port is connected to the oil nozzle hole.

[0009] As a further optimization or improvement of the present solution, the valve seat assembly further includes a filter plate, and the filter plates are installed on both the blocking block and the mounting block.

[0010] As a further optimization or improvement of the present solution, the oil nozzle assembly further includes a one-way pressure valve, and the slag discharge port is connected to the oil nozzle hole via the one-way pressure valve.

[0011] As a further optimization or improvement of the present solution, a flexible scraper is installed at the port of the oil nozzle hole at one end close to the valve seat assembly.

[0012] As a further optimization or improvement of this solution, a sealing ring is installed between the valve seat assembly and the oil nozzle assembly.

[0013] As a further optimization or improvement of this solution, a pressure relief screw is installed on the valve body.

[0014] As a further optimization or improvement of this solution, a bracket is installed on the valve cover, and the electric actuator is fixedly installed on the bracket.

[0015] Beneficial effects of the present invention:

[0016] (1) The present invention switches the nozzle hole by rotating the valve seat assembly, so that the blocking block is disengaged from blocking the nozzle hole, and the mounting block overlaps the nozzle hole. The oil inside the nozzle hole applies pressure to the pressure plate through the mounting block and drives the pressure plate to slide toward the inside of the special-shaped cavity, thereby increasing the air pressure inside the circular cavity. At this time, part of the oil will enter the special-shaped cavity through the filter plate, and then the brush on the brush plate will pass through the filter plate and contact the inner wall of the annular groove. At the same time, as the valve seat assembly rotates, the brush plate cleans the groove wall of the annular groove, thereby greatly improving the cleaning efficiency of the brush plate on the inner wall of the annular groove.

[0017] Next, when the liquid through hole rotates to the corresponding oil nozzle hole, the switching is completed. At this time, the sealing block blocks the other oil nozzle holes, and the oil inside the oil nozzle hole drives the brush plate to move into the circular cavity. At this time, the air pressure inside the special-shaped cavity increases and drives the pressure plate and part of the oil to be squeezed into the annular groove. The debris particles brushed off from the inner wall of the annular groove will be immersed in the oil. As the pressure plate applies pressure to the oil, the pressure plate will squeeze the oil and the debris particles immersed in the oil into the slag discharge port, so that they enter the oil nozzle hole through the slag discharge port at the same time, completing the cleaning of the annular groove, avoiding the friction between the liquid through hole and the debris particles inside the annular groove when the valve seat assembly rotates, causing damage to the valve seat assembly and the oil nozzle assembly.

[0018] (2) The flexible scraper in the present invention is slightly higher than the annular groove. When assembling the valve seat assembly, the filter plate on the valve seat assembly presses the flexible scraper to filter the oil inside the nozzle hole through the filter plate. Then, as the valve seat assembly rotates, the filter residue on the filter plate is scraped off by the flexible scraper, effectively preventing foreign particles in the oil inside the nozzle hole from entering the annular groove and causing secondary wear to the liquid hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the local structure of the present invention.

[0022] Figure 3 Schematic diagram of the connection between the valve stem and valve seat assembly.

[0023] Figure 4 It is a cross-sectional view of the connection between the valve seat assembly and the nozzle assembly.

[0024] Figure 5 This is an exploded view of the valve seat assembly and the nozzle assembly.

[0025] Figure 6 Schematic diagram of the bottom structure of the valve seat assembly.

[0026] Figure 7 This is a schematic diagram of the slag discharge port structure.

[0027] Figure 8 Schematic diagram of the internal structure of the valve seat assembly.

[0028] Fig. 9 It is a cross-sectional view of the local structure of the valve seat assembly.

[0029] Fig.10 Schematic diagram of the brush plate and pressure plate structure.

[0030] The following are marked in the figure: 1. valve body; 2. flange; 3. valve cover; 4. bracket; 5. electric actuator; 6. alloy bushing; 7. nozzle assembly; 701. annular slide; 702. nozzle hole; 703. slag discharge port; 704. one-way pressure valve; 705. flexible scraper; 8. sealing gasket; 9. valve seat assembly; 901. liquid hole; 902. annular slide; 903. blocking block; 904. mounting block; 905. filter plate; 906. circular cavity; 907. special-shaped cavity; 908. brush plate; 909. pressure plate; 10. connecting sleeve; 11. pressure relief screw; 12. valve stem; 13. bearing gland; 14. needle bearing; 15. sealing ring. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1-Figure 10 , an adjustable fixed throttle valve, comprising a valve body 1, a flange 2 is installed on one side of the valve body 1, the flange 2 fixes the nozzle assembly 7 in the valve body 1 through an alloy bushing 6 and a sealing gasket 8, a valve cover 3 is installed on the other side of the valve body 1, the valve cover 3 fixes the valve stem 12 in the valve body 1 through a bearing gland 13 and a needle bearing 14, the valve stem 12 is connected to the electric actuator 5, the end of the valve stem 12 is connected to the valve seat assembly 9 through a connecting sleeve 10, and the valve seat assembly 9 is located on the nozzle assembly 7 and rotates;

[0033] The valve seat assembly 9 includes an annular slide 902, a liquid hole 901, a blocking block 903 and a mounting block 904. The nozzle assembly 7 includes an annular chute 701, a slag discharge port 703 and a plurality of nozzle holes 702. The liquid hole 901 is provided through the annular slide 902. The plurality of nozzle holes 702 are all located in the annular chute 701, and the sizes of each nozzle hole 702 are different. The liquid hole 901 overlaps with the corresponding nozzle hole 702. The blocking block 903 and the mounting block 904 are provided on the annular slide 902. The annular slide 902 is located in the annular chute 701 and rotates.

[0034] The blocking block 903 blocks the nozzle hole 702 which does not overlap with the liquid hole 901, and a circular cavity 906 and a special-shaped cavity 907 are respectively installed in the blocking block 903 and the mounting block 904, the circular cavity 906 is connected with the special-shaped cavity 907, and a brush plate 908 and a pressure plate 909 are respectively sealed and slidably mounted on the circular cavity 906 and the special-shaped cavity 907, and the slag discharge port 703 is located in the annular slide groove 701, and the slag discharge port 703 is connected to the nozzle hole 702.

[0035] Specifically, a bracket 4 is installed on the valve cover 3 , and the electric actuator 5 is fixedly installed on the bracket 4 .

[0036] Specifically, a pressure relief screw 11 is installed on the valve body 1 .

[0037] It should be noted that there is a sealed and connected air cavity inside the circular cavity 906 and the special-shaped cavity 907. During operation, if the brush plate 908 is pressed, the brush plate 908 will move toward the inside of the circular cavity 906, and the air pressure in the air cavity will increase, and the air pressure will drive the pressure plate 909 to move.

[0038] When in use, the electric actuator 5 drives the valve stem 12 to rotate, so that the valve stem 12 drives the valve seat assembly 9 to rotate synchronously through the connecting sleeve 10. When the liquid hole 901 on the valve seat assembly 9 coincides with the corresponding oil nozzle hole 702, a throttling hole of corresponding caliber can be formed.

[0039] In the initial state, if Figure 4 , the liquid hole 901 overlaps with the corresponding oil nozzle hole 702 to form a throttling flow hole. At this time, the blocking block 903 blocks the other oil nozzle holes 702. The oil exerts pressure on the brush plate 908 through the blocking block 903 and drives the brush plate 908 to move into the circular cavity 906. At this time, the gas inside the circular cavity 906 is compressed, and part of the oil will enter the circular cavity 906. Since the brush plate 908 is sealed and connected to the circular cavity 906, the oil will not enter the air cavity of the circular cavity 906.

[0040] When the valve seat assembly 9 is rotated to switch the nozzle hole 702, the blocking block 903 is separated from the nozzle hole 702, and the mounting block 904 overlaps with the nozzle hole 702. Then, the oil inside the nozzle hole 702 applies pressure to the pressure plate 909 through the mounting block 904, so that the pressure plate 909 slides toward the inside of the special-shaped cavity 907. At this time, part of the oil will enter the special-shaped cavity 907. Since the pressure plate 909 is sealed and connected with the special-shaped cavity 907, the oil will not enter the gas cavity of the special-shaped cavity 907. The movement of the pressure plate 909 drives the gas inside the special-shaped cavity 907 to the circular cavity. The valve seat assembly 906 moves and compresses, the air pressure inside the circular cavity 906 increases and drives the brush plate 908 to move toward the annular chute 701. At this time, the oil entering the circular cavity 906 is squeezed into the annular chute 701 by the brush plate 908, and then the brush on the brush plate 908 contacts the groove wall of the annular chute 701. At the same time, as the valve seat assembly 9 rotates, the groove wall of the annular chute 701 is cleaned, and the inner wall of the annular chute 701 is infiltrated with the oil, thereby improving the cleaning efficiency of the brush plate 908 on the inner wall of the annular chute 701.

[0041] As the valve seat assembly 9 rotates, when the liquid through hole 901 rotates to the corresponding oil nozzle hole 702, the switching is completed. At this time, the blocking block 903 blocks the other oil nozzle holes 702 again, and the oil inside the oil nozzle hole 702 again applies pressure to the brush plate 908 through the blocking block 903 and drives the brush plate 908 to move into the circular cavity 906. At this time, the brush plate 908 drives the internal gas of the circular cavity 906 to flow to the special-shaped cavity 907. The internal air pressure of the special-shaped cavity 907 increases and drives the pressure plate 909 and part of the oil to be squeezed into the annular groove 701. As the oil enters the annular groove 701, the debris particles brushed off from the inner wall of the annular groove 701 will be immersed in the oil. As the pressure plate 909 moves, the pressure plate 909 will squeeze the oil into the slag discharge port 703, so that the oil enters the oil nozzle hole 702 through the slag discharge port 703. At this time, the debris particles immersed in the oil will be transported to the oil nozzle hole 702 together.

[0042] See also Figure 6-Figure 9 The valve seat assembly 9 also includes a filter plate 905 , and the filter plate 905 is installed on both the blocking block 903 and the mounting block 904 .

[0043] It should be noted that the function of the filter plate 905 is to filter impurities in the oil so that the oil entering the circular cavity 906 and the special-shaped cavity 907 is free of impurities.

[0044] See also Figure 7 , a flexible scraper 705 is installed at the port of the nozzle hole 702 close to one end of the valve seat assembly 9. It should be noted that the flexible scraper 705 is slightly higher than the annular groove 701. When the valve seat assembly 9 is assembled, the filter plate 905 on the valve seat assembly 9 presses the flexible scraper 705, so that the oil inside the nozzle hole 702 is filtered through the filter plate 905. Then, as the valve seat assembly 9 rotates, the filter residue on the filter plate 905 is scraped off by the flexible scraper 705, effectively preventing the debris particles in the oil inside the nozzle hole 702 from entering the annular groove 701 and causing secondary wear to the liquid hole 901.

[0045] See also Figure 7 The nozzle assembly 7 further includes a one-way pressure valve 704, and the slag discharge port 703 is connected to the nozzle hole 702 through the one-way pressure valve 704. It should be noted that the slag discharge port 703 is connected to the side wall of the nozzle hole 702, and the hydraulic pressure of the side wall of the nozzle hole 702 is relatively small. The pressure plate 909 can press the oil immersed in the particle impurities into the nozzle hole 702 through the slag discharge port 703 and the one-way pressure valve 704.

[0046] See also Figure 4 A sealing ring 15 is installed between the valve seat assembly 9 and the nozzle assembly 7. It should be noted that the sealing ring 15 between the valve seat assembly 9 and the nozzle assembly 7 can prevent the oil from overflowing through the gap between the nozzle assembly 7 and the valve seat assembly 9, and isolate impurities in the oil.

[0047] The implementation principle of the present invention is:

[0048] When in use, the electric actuator 5 drives the valve stem 12 to rotate, so that the valve stem 12 drives the valve seat assembly 9 to rotate synchronously through the connecting sleeve 10. When the liquid through hole 901 on the valve seat assembly 9 coincides with the corresponding nozzle hole 702, a throttling hole of corresponding caliber can be formed. At this time, the blocking block 903 blocks other nozzle holes 702. The oil inside the nozzle hole 702 is first filtered through the filter plate 905, and then the blocking block 903 applies pressure to the brush plate 908 and drives the brush plate 908 to move into the circular cavity 906. At this time, the gas inside the circular cavity 906 is compressed, and part of the oil in the nozzle hole 702 enters the circular cavity 906 through the filter plate 905. Since the brush plate 908 is sealed and connected to the circular cavity 906, the oil will not enter the gas cavity of the circular cavity 906.

[0049] When the aperture of the throttling hole needs to be adjusted, the valve seat assembly 9 is rotated to switch the nozzle hole 702, and the blocking block 903 gradually disengages from blocking the nozzle hole 702. Then the mounting block 904 overlaps with the nozzle hole 702, and the oil inside the nozzle hole 702 applies pressure to the pressure plate 909 through the mounting block 904, so that the pressure plate 909 slides toward the inside of the special-shaped cavity 907. At this time, part of the oil will enter the special-shaped cavity 907 through the filter plate 905. Since the pressure plate 909 is sealed and connected to the special-shaped cavity 907, the oil will not enter the air cavity of the special-shaped cavity 907. The movement of the pressure plate 909 drives the inside of the special-shaped cavity 907 to The gas moves into the circular cavity 906 and is compressed, and the air pressure inside the circular cavity 906 increases and drives the brush plate 908 to move toward the annular chute 701. At this time, the oil entering the circular cavity 906 is squeezed into the annular chute 701 by the brush plate 908, and then the brush on the brush plate 908 passes through the filter plate 905 and contacts the inner wall of the annular chute 701. At the same time, as the valve seat assembly 9 rotates, the brush plate 908 cleans the groove wall of the annular chute 701, and cooperates with the oil to infiltrate the inner wall of the annular chute 701, which greatly improves the cleaning efficiency of the brush plate 908 on the inner wall of the annular chute 701.

[0050] As the valve seat assembly 9 rotates, when the liquid hole 901 rotates to the corresponding nozzle hole 702, the switching is completed. At this time, the blocking block 903 blocks the other nozzle holes 702 again, and the oil inside the nozzle hole 702 again presses the brush plate 908 through the blocking block 903 and drives the brush plate 908 to move into the circular cavity 906. At this time, the brush plate 908 drives the gas inside the circular cavity 906 to flow into the special-shaped cavity 907. The air pressure inside the special-shaped cavity 907 increases and drives the pressure plate 909 and part of the oil to be squeezed into the annular groove 701. The oil enters the annular groove 701 through the filter plate 905, and the debris particles brushed off from the inner wall of the annular groove 701 will be immersed in the oil. As the pressure plate 909 applies pressure to the oil, the pressure plate 909 will squeeze the oil and the debris particles immersed in the oil into the slag discharge port 703, so that the oil and the debris particles immersed in the oil can enter the oil nozzle hole 702 through the slag discharge port 703 at the same time, thus completing the cleaning of the annular groove 701 and avoiding the friction between the liquid hole 901 and the debris particles inside the annular groove 701 when the valve seat assembly 9 rotates, thereby causing damage to the liquid hole 901.

[0051] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. An adjustable fixed throttle valve, characterized in that: The valve body (1) comprises a valve body (1), a flange (2) is installed on one side of the valve body (1), the flange (2) fixes a nozzle assembly (7) in the valve body (1) through an alloy bushing (6) and a sealing gasket (8), a valve cover (3) is installed on the other side of the valve body (1), the valve cover (3) fixes a valve stem (12) in the valve body (1) through a bearing gland (13) and a needle bearing (14), the valve stem (12) is connected to an electric actuator (5), the end of the valve stem (12) is connected to a valve seat assembly (9) through a connecting sleeve (10), and the valve seat assembly (9) is located on the nozzle assembly (7) and rotates; The valve seat assembly (9) comprises an annular slide (902), a liquid through hole (901), a blocking block (903) and a mounting block (904); the nozzle assembly (7) comprises an annular slide groove (701), a slag discharge port (703) and a plurality of nozzle holes (702); the annular slide (902) is provided with a liquid through hole (901); the plurality of nozzle holes (702) are all located in the annular slide groove (701); and the sizes of each nozzle hole (702) are different; the liquid through hole (901) overlaps with the corresponding nozzle hole (702); the annular slide (902) is provided with a blocking block (903) and a mounting block (904); the annular slide (902) is located in the annular slide groove (701) and rotates; The blocking block (903) blocks the nozzle hole (702) that does not overlap with the liquid hole (901); a circular cavity (906) and a special-shaped cavity (907) are respectively installed in the blocking block (903) and the mounting block (904); the circular cavity (906) is connected to the special-shaped cavity (907); a brush plate (908) and a pressure plate (909) are respectively installed on the circular cavity (906) and the special-shaped cavity (907) for sealing and sliding; the slag discharge port (703) is located in the annular chute (701); and the slag discharge port (703) is connected to the nozzle hole (702); The valve seat assembly (9) further comprises a filter plate (905), and the filter plate (905) is mounted on both the blocking block (903) and the mounting block (904); The oil nozzle assembly (7) further comprises a one-way pressure valve (704), and the slag discharge port (703) is connected to the oil nozzle hole (702) via the one-way pressure valve (704); A flexible scraper (705) is installed at a port of the oil nozzle hole (702) close to one end of the valve seat assembly (9).

2. An adjustable fixed throttle valve according to claim 1, characterized in that: A sealing ring (15) is installed between the valve seat assembly (9) and the oil nozzle assembly (7).

3. The adjustable fixed throttle valve according to claim 1, characterized in that: A pressure relief screw (11) is mounted on the valve body (1).

4. The adjustable fixed throttle valve according to claim 1, characterized in that: The valve cover (3) is mounted on a bracket (4), and the electric actuator (5) is fixedly mounted on the bracket (4).

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