Fixed throttling device

Abstract

The invention provides a fixed throttling device, which relates to the technical field of oil blowout, and comprises a throttling valve body, an oil outlet, an oil inlet, a union cover, a valve rod, an oil nozzle fixing frame, an inner sleeve and an outer sleeve cover, wherein a valve cavity is formed in the throttling valve body, the oil outlet and the oil inlet are symmetrically fixed to the two sides of the throttling valve body, the top end of the throttling valve body is used for installing the union cover and the valve rod part, the bottom end of the throttling valve body is used for installing the inner sleeve and the outer sleeve cover, and the oil nozzle fixing frame is located in the valve cavity and slides up and down. The oil nozzle fixing frame is arranged, the oil nozzle mounting ports used for mounting the oil nozzle bodies of different models are formed in the oil nozzle fixing frame, and the relative position of the oil nozzle fixing frame and the valve cavity is adjusted through the valve rod, so that one oil nozzle body is aligned with the oil outlet and the oil inlet; and the relative position of the oil nozzle fixing frame and the valve cavity is adjusted again, so that the oil nozzle body with the model required to be used can be switched, and the throttling device is adjustable.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum spraying, in particular to a fixed throttling device. Background Art

[0002] Currently, during the blowout test of shale gas wells and marine wells, a lot of sand is produced in the formation and the nozzle is severely damaged. In addition, different types of nozzles need to be used according to the actual blowout volume requirements.

[0003] Traditional fixed throttle nozzles can only be installed with one model, requiring frequent nozzle changes, which can affect formation flowback in certain situations. Furthermore, the high pressures during blowdown testing in the Sichuan and Chongqing regions often require frequent operations in high-pressure areas, which can compromise personnel safety. Therefore, it was necessary to propose a fixed, adjustable flow device to address these issues. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a fixed throttling device, which solves the problem that the traditional fixed throttle valve nozzle can only be installed with one model, frequent nozzle replacement is inefficient and dangerous, and the formation produces a lot of sand, causing serious damage to the nozzle.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a fixed throttling device, comprising: A throttle body, an oil outlet, and an oil inlet, wherein the throttle body has a valve cavity inside, the oil outlet and the oil inlet are symmetrically fixed on both sides of the throttle body, and the oil outlet and the oil inlet are both connected to the valve cavity, and the top and bottom ends of the valve cavity are both open; The oil cover and the valve stem are threadedly connected to the top of the throttle body, the valve stem is threadedly connected to the center hole of the oil cover, and the top of the valve stem is fixedly connected to a hand wheel; A nozzle fixing bracket, wherein the top end of the nozzle fixing bracket is detachably and rotatably connected to the bottom end of the valve stem, the nozzle fixing bracket is in sliding and sealing cooperation with the valve cavity, and the side of the nozzle fixing bracket is provided with a plurality of nozzle mounting openings of different sizes, the axes of the plurality of nozzle mounting openings of different sizes are parallel to the axes of the oil outlet and the oil inlet, and a nozzle body is installed in each of the nozzle mounting openings; An inner sleeve and an outer cover, wherein the inner side of the inner sleeve is provided with an inner slotted hole corresponding to the oil nozzle fixing bracket, the oil nozzle fixing bracket is located on the inner side of the inner slotted hole, and the oil nozzle fixing bracket and the inner slotted hole are slidably sealed together, the top end of the inner sleeve is provided with a positioning port, the bottom end of the throttle body is provided with a positioning protrusion corresponding to the positioning port, the outer side of the bottom end of the throttle body is provided with a threaded connection portion, the top end of the outer cover is threadedly connected to the threaded connection portion, the inner sleeve is located on the inner side of the outer cover, and the bottom end of the outer cover is threadedly connected to an adjustable top block; A first stab-proof alloy sleeve is provided on the inner side of the oil outlet, and a second stab-proof alloy sleeve is provided on the inner side of the oil inlet.

[0006] Preferably, the inner side of the valve cavity is provided with a first upper guide plate, a first lower guide plate, a second upper guide plate, a second lower guide plate, a first pressure plate, and a second pressure plate; the cross section of the oil nozzle fixing frame is rectangular, the first pressure plate is fixedly connected to the throttle body by a first long screw, the top end of the first upper guide plate is against the bottom end of the first pressure plate, the bottom end of the first upper guide plate is against the top of the first stab-proof alloy sleeve, the top end of the first lower guide plate is against the bottom of the first stab-proof alloy sleeve, and the bottom end of the first lower guide plate is against the bottom end of the first stab-proof alloy sleeve. The end is pressed against the top of the inner sleeve, the second pressure plate is fixedly connected to the throttle body by a second long screw, the top of the second upper guide plate is pressed against the bottom end of the second pressure plate, the bottom end of the second upper guide plate is pressed against the top of the first stab-proof alloy sleeve, the top of the second lower guide plate is pressed against the bottom of the first stab-proof alloy sleeve, the bottom end of the second lower guide plate is pressed against the top of the inner sleeve, the first upper guide plate is symmetrical with the second upper guide plate, the first lower guide plate is symmetrical with the second lower guide plate, and the first pressure plate is symmetrical with the second pressure plate.

[0007] Preferably, the bottom of the oil nozzle fixing bracket is fixedly connected to a spring, the bottom end of the spring is fixedly connected to a clamping block, the clamping block is located at the inner bottom of the inner sleeve, and the side surface of the inner sleeve is threadedly connected to a clamping screw, one end of the clamping screw abuts against the side surface of the clamping block; The top of the oil nozzle fixing bracket is fixedly connected with a T-shaped clamp, the top of the T-shaped clamp is set to an arc shape, the bottom end of the valve stem is rotatably connected with a movable head, the bottom end of the movable head is fixedly connected with a mounting bracket, the inner side of the mounting bracket is rotatably connected with a first claw member and a second claw member through a pin, the first claw member and the second claw member are symmetrically arranged, and a V-shaped spring piece is fixedly connected between the first claw member and the second claw member, the opening of the V-shaped spring piece faces upward, and the first claw member and the second claw member correspond to the top horizontal plate of the T-shaped clamp.

[0008] Preferably, a first bayonet and a second bayonet are provided at the bottom of the horizontal plate of the T-shaped clamp and close to the vertical plate. The first claw is provided with a first clamping foot corresponding to the first bayonet, and the second claw is provided with a second clamping foot corresponding to the second bayonet.

[0009] Preferably, the number of the oil nozzle mounting openings is 4-6, and the sizes of the oil nozzle mounting openings gradually increase from bottom to top.

[0010] Preferably, the end of the oil outlet away from the throttle body is fixedly connected to a first flange, and the end of the oil inlet away from the throttle body is fixedly connected to a second flange.

[0011] Preferably, the nozzle fixing frame and the nozzle body are both made of stab-proof materials.

[0012] Preferably, a sealing ring is provided between the outer cover and the throttle valve body.

[0013] The present invention provides a fixed throttling device. It has the following beneficial effects: 1. The present invention provides a nozzle holder with a plurality of nozzle mounting openings for mounting nozzle bodies of different types. The relative position of the nozzle holder and the valve cavity is adjusted by using the valve stem (threaded pair matching) so that one of the nozzle bodies is aligned with the oil outlet and the oil inlet (that is, it is in a working state). The relative position of the nozzle holder and the valve cavity is adjusted again to switch to the nozzle body of the desired type. There is no need to relieve pressure to replace the nozzle, which makes the operation simpler, safer and more convenient. In addition, the nozzle holder as a whole is also a replaceable structure. One replacement (replacing the nozzle holder as a whole) can replace the original multiple replacements (original replacement of the nozzle body), which is more efficient.

[0014] 2. In the present invention, puncture-proof alloy sleeves (referring to the first puncture-proof alloy sleeve and the second puncture-proof alloy sleeve) are arranged on the inner side of the oil outlet and the oil inlet, which can reduce the damage to the inner wall of the interface pipe during the blowout process of sandy sea wells and increase the service life of the device.

[0015] 3. The present invention further improves the structure of the throttle valve body so that both the top and bottom ends thereof are open. The purpose of the top opening is for installing the valve stem, and the purpose of the bottom opening is to facilitate the disassembly and installation of the nozzle fixing bracket. The connection structure between the top end of the nozzle fixing bracket and the bottom end of the valve stem is specifically designed, and a self-installation and disassembly structure is composed of a first claw member, a second claw member, and a V-shaped spring piece. When the valve stem is controlled, the top end of the nozzle fixing bracket and the bottom end of the valve stem can be installed and disengaged, making it more convenient to disassemble and install the nozzle fixing bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional diagram of a fixed throttling device proposed by the present invention; Figure 2 A top view of a fixed throttling device proposed by the present invention; Figure 3 for Figure 2 Cross-sectional view at the middle BB; Figure 4 for Figure 2 Cross-sectional view at CC; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 This is a disassembly diagram of a fixed throttling device proposed in the present invention; Figure 7 This is a schematic diagram of the cooperation between the anti-stab alloy sleeve and the nozzle fixing bracket of a fixed throttling device proposed by the present invention; Figure 8 This is a half-section perspective view of a quick-connect assembly for fixing a throttling device proposed in the present invention.

[0017] Among them, 1. throttle body; 2. oil outlet; 3. oil inlet; 4. first stab-proof alloy sleeve; 5. second stab-proof alloy sleeve; 6. first upper guide plate; 7. first lower guide plate; 8. second upper guide plate; 9. second lower guide plate; 10. first pressure plate; 11. second pressure plate; 12. first long screw; 13. second long screw; 14. oil cap; 15. valve stem; 16. handwheel; 17. oil nozzle fixing bracket; 18. oil nozzle installation port; 19. oil nozzle Main body; 20. Movable head; 21. Mounting frame; 22. First claw; 23. Second claw; 24. V-shaped spring; 25. T-shaped clamp; 26. First bayonet; 27. Second bayonet; 28. Second clamping foot; 29. ​​First clamping foot; 30. Positioning protrusion; 31. Threaded connection; 32. Inner sleeve; 33. Clamping screw; 34. Clamping block; 35. Spring; 36. Outer cover; 37. Adjustable top block; 38. Positioning port. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0019] Example 1: like Figures 1-8 As shown, an embodiment of the present invention provides a fixed throttling device, including a throttle body 1, an oil outlet 2, an oil inlet 3, an oil cover 14, a valve stem 15, an oil nozzle fixing frame 17, an inner sleeve 32, and an outer cover 36; wherein, the throttle body 1 has a valve cavity inside, the oil outlet 2 and the oil inlet 3 are symmetrically fixed on both sides of the throttle body 1, the axes of the oil outlet 2 and the oil inlet 3 coincide, the oil outlet 2 and the oil inlet 3 are both connected to the valve cavity, and the top and bottom ends of the valve cavity are both open.

[0020] The top of the throttle body 1 is used to install the oil cover 14 and the valve stem 15, and the bottom of the throttle body 1 is used to install the inner sleeve 32 and the outer cover 36. The oil nozzle fixing frame 17 is located inside the valve cavity and slides up and down.

[0021] The oil cap 14 is threadedly connected to the top of the throttle body 1, and the oil cap 14 and the throttle body 1 are sealed. The valve stem 15 is threadedly connected to the center hole of the oil cap 14. The top of the valve stem 15 is fixedly connected to a handwheel 16. The user operates the valve stem 15 through the handwheel 16. The threaded pair between the valve stem 15 and the oil cap 14 causes the valve stem 15 to move up and down synchronously.

[0022] The top of the nozzle holder 17 is detachably connected to the bottom end of the valve stem 15, and the nozzle holder 17 is in sliding and sealing cooperation with the valve chamber. This structure makes it impossible for the nozzle holder 17 to rotate and slide. With this rotating connection structure, the valve stem 15 can only transmit the up and down movement to the nozzle holder 17, which is used to adjust the up and down position of the nozzle holder 17. Several nozzle mounting ports 18 of different sizes are provided on the side of the nozzle holder 17. Generally, the number of nozzle mounting ports 18 is 4-6, and the size of the nozzle mounting ports 18 gradually increases from bottom to top. The axes of the several nozzle mounting ports 18 of different sizes are parallel to the axes of the oil outlet 2 and the oil inlet 3, and a nozzle body 19 is installed in each nozzle mounting port 18.

[0023] By adjusting the upper and lower positions of the nozzle fixing bracket 17, one of the nozzle bodies 19 is located between the oil outlet 2 and the oil inlet 3, so that the oil outlet 2 and the oil inlet 3 are connected. During the offshore well blowout process, the liquid enters from the oil inlet 3, then passes through the nozzle body 19, and then passes through the oil outlet 2, thereby achieving the purpose of throttling.

[0024] The purpose of adjustable throttling is achieved by adjusting the position of the nozzle fixing bracket 17 and then replacing the nozzle body 19 in the working state.

[0025] The inner side of the inner sleeve 32 is provided with an inner slot corresponding to the nozzle fixing bracket 17. The top of the inner sleeve 32 is open and the bottom is closed. The nozzle fixing bracket 17 is located on the inner side of the inner slot, and the nozzle fixing bracket 17 is slidably and sealedly matched with the inner slot. The top end of the inner sleeve 32 is provided with a positioning port 38, and the bottom end of the throttle body 1 is provided with a positioning protrusion 30 corresponding to the positioning port 38. A threaded connection part 31 is provided on the outer side of the bottom end of the throttle body 1. The top end of the outer cover 36 is threadedly connected to the threaded connection part 31. The inner sleeve 32 is located on the inner side of the outer cover 36, and the bottom end of the outer cover 36 is threadedly connected to an adjustable top block 37.

[0026] During installation, the inner sleeve 32 must be installed first, then the outer cover 36 must be threadedly installed, and finally the adjustable top block 37 must be adjusted so that the top of the inner sleeve 32 is squeezed against the bottom of the throttle body 1 to form a seal. A sealing ring may be provided here if necessary.

[0027] After the outer cover 36 and the inner sleeve 32 are disassembled, the nozzle fixing frame 17 can be taken out and replaced with a new nozzle fixing frame 17 as a whole.

[0028] The working principle of this device is as follows: the user operates the handwheel 16 to drive the valve stem 15 to rotate. Under the cooperation of the threaded pair, the valve stem 15 moves up and down synchronously, thereby driving the nozzle fixing bracket 17, so that one of the nozzle bodies 19 on the nozzle fixing bracket 17 is in the working state. As shown in the above steps, the other nozzle body 19 on the nozzle fixing bracket 17 can also be switched to the working state, thereby achieving the purpose of adjustable flow.

[0029] A first puncture-proof alloy sleeve 4 is installed inside the oil outlet 2, and a second puncture-proof alloy sleeve 5 is installed inside the oil inlet 3. This reduces damage to the inner wall of the interface pipe during blowout in sand-rich offshore wells, thereby extending the service life of the device. The puncture-proof alloy sleeves can be made of manganese-chromium alloy.

[0030] The inner side of the valve cavity is provided with a first upper guide plate 6, a first lower guide plate 7, a second upper guide plate 8, a second lower guide plate 9, a first pressure plate 10, and a second pressure plate 11; the cross-sections of the first upper guide plate 6, the first lower guide plate 7, the second upper guide plate 8, the second lower guide plate 9, the first pressure plate 10, and the second pressure plate 11 are all semicircular (small semicircular), one side of which is an arc surface and the other side is a plane. The cross-section of the oil nozzle fixing frame 17 is rectangular, and the first pressure plate 10 is fixedly connected to the throttle body 1 by a first long screw 12. A stepped through hole is provided on the shell of the throttle body 1, and the first long screw 12 passes through the stepped through hole from the outside and is then threadedly fixed with the first pressure plate 10. The top end of the first upper guide plate 6 abuts against the bottom end of the first pressure plate 10, and the bottom end of the first upper guide plate 6 abuts against the top of the first stab-proof alloy sleeve 4, so that the first upper guide plate 6 is fixed, the top end of the first lower guide plate 7 is abutted against the bottom of the first stab-proof alloy sleeve 4, and the bottom end of the first lower guide plate 7 is abutted against the top of the inner sleeve 32, so that the position of the first lower guide plate 7 can be fixed, the second pressure plate 11 is fixedly connected to the throttle body 1 by the second long screw 13, and a stepped through hole is provided on the shell of the throttle body 1, and the second long screw 13 passes through the stepped through hole from the outside, and then is threadedly fixed with the second pressure plate 11, the top end of the second upper guide plate 8 is abutted against the bottom end of the second pressure plate 11, and the bottom end of the second upper guide plate 8 is abutted against the top of the first stab-proof alloy sleeve 4, so that the second upper guide plate 8 can be fixed, the top end of the second lower guide plate 9 is abutted against the bottom of the first stab-proof alloy sleeve 4, and the bottom end of the second lower guide plate 9 is abutted against the top of the inner sleeve 32, so that the second lower guide plate 9 can be fixed.

[0031] The first upper guide plate 6 is symmetrical with the second upper guide plate 8, the first lower guide plate 7 is symmetrical with the second lower guide plate 9, and the first pressure plate 10 is symmetrical with the second pressure plate 11. A gap area is formed between the two symmetrical guide plates or pressure plates. The inner side of the valve cavity of the throttle valve body is generally set to be circular. After installing the first upper guide plate 6, the first lower guide plate 7, the second upper guide plate 8, the second lower guide plate 9, the first pressure plate 10, and the second pressure plate 11, they can cooperate well with the oil nozzle fixing bracket 17.

[0032] In one embodiment, the bottom of the nozzle fixing frame 17 is fixedly connected to a spring 35, and the bottom end of the spring 35 is fixedly connected to a clamping block 34. The clamping block 34 is located at the inner bottom of the inner sleeve 32, and the side of the inner sleeve 32 is threadedly connected to a clamping screw 33. One end of the clamping screw 33 abuts against the side of the clamping block 34, and the clamping screw 33 is used to fix the clamping block 34 to the inner bottom of the inner sleeve 32; the top of the nozzle fixing frame 17 is fixedly connected to a T-shaped clamp 25, and the top of the T-shaped clamp 25 is fixed to the inner bottom of the inner sleeve 32. The end is set to be arc-shaped, and the bottom end of the valve stem 15 is rotatably connected to the movable head 20, and the bottom end of the movable head 20 is fixedly connected to the mounting bracket 21. The inner side of the mounting bracket 21 is rotatably connected to the first claw member 22 and the second claw member 23 through a pin. The first claw member 22 and the second claw member 23 are symmetrically arranged, and a V-shaped spring piece 24 is fixedly connected between the first claw member 22 and the second claw member 23. The opening of the V-shaped spring piece 24 faces upward, and the first claw member 22 and the second claw member 23 correspond to the top horizontal plate of the T-shaped clamp 25.

[0033] When the nozzle fixing bracket 17 is connected to the valve stem 15, it is necessary to operate the valve stem 15 to move downward to the bottom end, and squeeze the arc surface of the top of the T-shaped clamp 25 at the bottom of the first claw 22 and the second claw 23, so that the first claw 22 and the second claw 23 are separated toward both sides. This process overcomes the elastic force of the V-shaped spring piece 24. When the first claw 22 and the second claw 23 pass over the horizontal plate of the T-shaped clamp 25, they are no longer subjected to the squeezing force. At this time, under the action of the rebound force of the V-shaped spring piece 24, the first claw 22 and the second claw 23 approach each other, so that they can be stably clamped on the T-shaped clamp 25.

[0034] When disassembling the nozzle holder 17 and the valve stem 15, first remove the inner sleeve 32 and the outer sleeve 36, move the valve stem 15 downward to a suitable position, so that most of the nozzle holder 17 is exposed to the throttle body 1, and the user squeezes the nozzle holder 17 upward to move the arc surface of the top end of the T-shaped clamp 25 upward, so that it pushes the bottom of the V-shaped spring piece 24 upward, causing the V-shaped spring piece 24 to deform, and the two ends of the V-shaped spring piece 24 exert force obliquely upward to drive the first claw member 22 and the second claw member 23 to open toward both sides. In this case, the operator quickly moves down the nozzle holder 17, and removes the T-shaped clamp 25 before the first claw member 22 and the second claw member 23 return to their positions to clamp the T-shaped clamp 25.

[0035] Due to the provision of a tension structure consisting of a spring 35 and a clamping block 34, when the nozzle fixing bracket 17 moves upward and is in the working state, the nozzle fixing bracket 17 is simultaneously subjected to a downward elastic tension and an upward tension of the valve stem 15, making the nozzle fixing bracket 17 more stable, and the first claw member 22 and the second claw member 23 are not likely to fall off automatically during the working and adjustment process.

[0036] After disassembling the nozzle holder 17, the reinstallation process requires first extending the clamping block 34 into the inner bottom of the inner sleeve 32, and then fixing the clamping block 34 to the inner sleeve 32 by the clamping screw 33. At this time, the bottom end of the nozzle holder 17 also extends into the inner side of the inner sleeve 32, aligning the top end of the nozzle holder 17 with the bottom port of the throttle body 1, and then installing the outer cover 36. Finally, by controlling the valve stem 15, the nozzle holder 17 is connected to the valve stem 15.

[0037] A first bayonet 26 and a second bayonet 27 are provided at the bottom of the horizontal plate of the T-shaped clamp 25 and close to the vertical plate. A first clamping foot 29 corresponding to the first bayonet 26 is provided on the first claw 22, and a second clamping foot 28 corresponding to the second bayonet 27 is provided on the second claw 23. When the valve stem drives the first bayonet 26 and the second bayonet 27 to move upward, the T-shaped clamp 25 can be stably clamped to avoid the problem of tripping.

[0038] The end of the oil outlet 2 away from the throttle body 1 is fixedly connected to a first flange, and the end of the oil inlet 3 away from the throttle body 1 is fixedly connected to a second flange, which is used for flange connection with the pipeline system.

[0039] The nozzle fixing frame 17 and the nozzle body 19 are both made of puncture-proof materials, which further enhances the puncture-proof capability of the throttle valve.

[0040] A sealing ring is provided between the outer cover 36 and the throttle body 1 to improve the sealing performance of the connection.

[0041] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A fixed throttling device, comprising a throttle valve body (1), an oil outlet (2), and an oil inlet (3), wherein the throttle valve body (1) has a valve cavity inside, the oil outlet (2) and the oil inlet (3) are symmetrically fixed on both sides of the throttle valve body (1), and the oil outlet (2) and the oil inlet (3) are both connected to the valve cavity, characterized in that: The top and bottom ends of the valve cavity are both open, and further include: The oil cover (14) and the valve stem (15) are connected by threads to the top of the throttle valve body (1), the valve stem (15) is connected by threads to the center hole of the oil cover (14), and the top of the valve stem (15) is fixedly connected to a hand wheel (16); A nozzle fixing frame (17), wherein the top end of the nozzle fixing frame (17) is detachably and rotatably connected to the bottom end of the valve stem (15), the nozzle fixing frame (17) is in sliding and sealing cooperation with the valve cavity, and a side surface of the nozzle fixing frame (17) is provided with a plurality of nozzle mounting openings (18) of different sizes, the axes of the plurality of nozzle mounting openings (18) of different sizes are parallel to the axes of the oil outlet (2) and the oil inlet (3), and a nozzle body (19) is installed in each of the nozzle mounting openings (18); An inner sleeve (32) and an outer cover (36), wherein an inner slot corresponding to the nozzle fixing frame (17) is provided on the inner side of the inner sleeve (32), the nozzle fixing frame (17) is located on the inner side of the inner slot, and the nozzle fixing frame (17) and the inner slot are slidably sealed together, a positioning opening (38) is provided on the top end of the inner sleeve (32), a positioning protrusion (30) corresponding to the positioning opening (38) is provided on the bottom end of the throttle valve body (1), a threaded connection portion (31) is provided on the outer side of the bottom end of the throttle valve body (1), the top end of the outer cover (36) is threadedly connected to the threaded connection portion (31), the inner sleeve (32) is located on the inner side of the outer cover (36), and the bottom end of the outer cover (36) is threadedly connected to an adjustable top block (37); A first stab-proof alloy sleeve (4) is provided on the inner side of the oil outlet (2), and a second stab-proof alloy sleeve (5) is provided on the inner side of the oil inlet (3).

2. A fixed throttling device according to claim 1, characterized in that: The inner side of the valve cavity is provided with a first upper guide plate (6), a first lower guide plate (7), a second upper guide plate (8), a second lower guide plate (9), a first pressure plate (10), and a second pressure plate (11); the cross section of the oil nozzle fixing frame (17) is rectangular, the first pressure plate (10) is fixedly connected to the throttle valve body (1) by a first long screw (12), the top end of the first upper guide plate (6) is against the bottom end of the first pressure plate (10), the bottom end of the first upper guide plate (6) is against the top of the first stab-proof alloy sleeve (4), the top end of the first lower guide plate (7) is against the bottom of the first stab-proof alloy sleeve (4), and the bottom end of the first lower guide plate (7) is against the inner sleeve The top of the second upper guide plate (8) is in contact with the top of the second pressure plate (11), the bottom of the second upper guide plate (8) is in contact with the top of the first stab-proof alloy sleeve (4), the top of the second lower guide plate (9) is in contact with the bottom of the first stab-proof alloy sleeve (4), the bottom of the second lower guide plate (9) is in contact with the top of the inner sleeve (32), the first upper guide plate (6) is symmetrical with the second upper guide plate (8), the first lower guide plate (7) is symmetrical with the second lower guide plate (9), and the first pressure plate (10) is symmetrical with the second pressure plate (11).

3. A fixed throttling device according to claim 1, characterized in that: The bottom of the oil nozzle fixing frame (17) is fixedly connected to a spring (35), the bottom end of the spring (35) is fixedly connected to a clamping block (34), the clamping block (34) is located at the inner bottom of the inner sleeve (32), and the side of the inner sleeve (32) is threadedly connected to a clamping screw (33), one end of the clamping screw (33) is against the side of the clamping block (34); The top of the oil nozzle fixing frame (17) is fixedly connected to a T-shaped clamp (25), the top of the T-shaped clamp (25) is arranged in an arc shape, the bottom end of the valve stem (15) is rotatably connected to a movable head (20), the bottom end of the movable head (20) is fixedly connected to a mounting frame (21), the inner side of the mounting frame (21) is rotatably connected to a first claw member (22) and a second claw member (23) through a pin, the first claw member (22) and the second claw member (23) are symmetrically arranged, a V-shaped spring piece (24) is fixedly connected between the first claw member (22) and the second claw member (23), the opening of the V-shaped spring piece (24) faces upward, and the first claw member (22) and the second claw member (23) correspond to the top horizontal plate of the T-shaped clamp (25).

4. A fixed throttling device according to claim 3, characterized in that: A first bayonet (26) and a second bayonet (27) are provided at the bottom of the horizontal plate of the T-shaped clamp (25) and near the vertical plate; a first clamping foot (29) corresponding to the first bayonet (26) is provided on the first claw (22); and a second clamping foot (28) corresponding to the second bayonet (27) is provided on the second claw (23).

5. A fixed throttling device according to claim 1, characterized in that: The number of the oil nozzle mounting openings (18) is 4-6, and the sizes of the oil nozzle mounting openings (18) gradually increase from bottom to top.

6. A fixed throttling device according to claim 1, characterized in that: One end of the oil outlet (2) away from the throttle valve body (1) is fixedly connected to a first flange, and one end of the oil inlet (3) away from the throttle valve body (1) is fixedly connected to a second flange.

7. A fixed throttling device according to claim 1, characterized in that: The oil nozzle fixing frame (17) and the oil nozzle body (19) are both made of puncture-proof materials.

8. A fixed throttling device according to claim 1, characterized in that: A sealing ring is provided between the outer cover (36) and the throttle valve body (1).

Images