A novel adjustable, erosion-resistant double-cage oil nozzle and its use method

Abstract

The present invention discloses an adjustable, erosion-resistant novel double-cage oil nozzle and a method for using the same, comprising an oil nozzle seat, an oil nozzle, an outer cage, a shell, an inner cage, a positioning sleeve and an end cover. The present invention adopts a double-cage structure, namely an outer cage and an inner cage, so that the entering high-pressure and high-speed fluid medium first acts on the outer cylindrical surface of the outer cage, thereby avoiding the direct effect of the high-pressure and high-speed fluid medium on the outer cylindrical surface of the oil nozzle and key parts such as a throttling hole, which is beneficial to improving the erosion problem of the oil nozzle; and by forcibly intervening the flow velocity and direction of the high-pressure and high-speed fluid medium, a relatively stable and ideal flow field and pressure field can be formed between the outer cylindrical surface of the oil nozzle and the inner cylindrical surface of the outer cage, especially after the fluids collide, their flow direction acts on the outer cylindrical surface of the oil nozzle at a smaller incident angle, thereby further reducing the influence of erosion on the oil nozzle.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum and natural gas equipment, and in particular relates to an adjustable, erosion-resistant new double-cage oil nozzle and a use method thereof. Background Art

[0002] During the extraction of shale gas, throttling control is required through the nozzle. At present, the domestic nozzle structure with a fixed aperture is generally used. It cannot be adjusted automatically during use and needs to be manually disassembled and replaced, with a low degree of automation. In order to facilitate precise control, foreign countries have adopted automatically adjustable nozzles driven by hydraulic or electric mechanisms. The nozzle opening is automatically controlled according to the pressure signal collected by the sensor, which significantly increases the oil and gas production. However, both fixed and adjustable nozzles have erosion problems to varying degrees, resulting in failure of the nozzle cutoff and shortened service life. Therefore, it is of great significance to develop an adjustable and erosion-resistant nozzle by optimizing the design of the nozzle structure. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art and to provide an adjustable, erosion-resistant new double-cage oil nozzle and a method of using the same.

[0004] In order to solve the technical problem, the technical solution of the present invention is: an adjustable, erosion-resistant new double-cage oil nozzle, including an oil nozzle seat, an oil nozzle, an outer cage sleeve, a shell, an inner cage sleeve, a positioning sleeve and an end cover, the shell is provided with an axial through hole and a radial hole, the oil nozzle seat is sleeved and fixed on the lower side of the axial through hole of the shell, the lower outer wall of the oil nozzle and the inner hole of the oil nozzle seat are interference fit, the lower inner wall of the inner cage sleeve and the upper outer wall of the oil nozzle are clearance fit, and the lower end of the inner cage sleeve and the upper end of the oil nozzle seat are provided with a reserved space, the circumference of the oil nozzle is provided with a through hole, the upper end of the inner cage sleeve passes through the positioning sleeve and the end cover in sequence, the middle outer wall of the inner cage sleeve and the inner hole of the positioning sleeve are The outer wall of the inner cage sleeve is keyed to the inner hole of the end cover with a clearance fit. The outer cage sleeve is arranged at the intersection of the axial through hole and the radial hole. The inner wall of the outer cage sleeve is clearance-fitted with the outer wall of the inner cage sleeve. The outer cage sleeve is circumferentially provided with through holes. The through holes of the outer cage sleeve correspond to the distribution positions of the through holes of the oil nozzle. The end cover is fixed to an end face of the axial through hole of the shell away from the oil nozzle seat. The locating sleeve is limited to the space formed by the inner hole of the end cover and the axial through hole of the shell. The lower end face of the locating sleeve is matched with the upper end face of the outer cage sleeve. The locating sleeve presses the outer cage sleeve against the upper end face of the oil nozzle seat. The inner hole axes of the oil nozzle seat, the oil nozzle, the outer cage sleeve, the inner cage sleeve, the locating sleeve and the end cover coincide.

[0005] Preferably, the radial hole is arranged in the middle of the shell, the end face of the radial hole is welded to the flange, and a vent nozzle is provided on one side wall at the intersection of the axial through hole and the radial hole of the shell. The flange is connected to the pressure end and is the medium inlet, and the end of the axial through hole close to the oil nozzle seat is connected to the downstream pipeline and is the medium outlet.

[0006] Preferably, the inner cage sleeve is composed of a cage sleeve part and a rod part, the ends of the cage sleeve part and the rod part are coaxially connected, the inner wall of the cage sleeve part and the outer wall of the oil nozzle have a clearance fit, and the clearance is 0.2mm, the outer wall of the cage sleeve part and the inner wall of the outer cage sleeve have a clearance fit, and the clearance is 0.5mm, the rod part passes through the inner holes of the positioning sleeve and the end cover in sequence, and the rod part and the positioning sleeve have a clearance fit, the upper side of the rod part is provided with a thread, the outer wall of the rod part is provided with a keyway, the inner wall of the end cover is provided with a keyway, the keyway of the end cover is arranged in a strip shape along the axial direction of the end cover, the flat key is fitted in the keyway of the end cover and the keyway of the rod part, the end of the rod part away from the cage sleeve part is externally connected to an electric mechanism, and the inner cage sleeve moves up and down in the reserved space along the axis of the oil nozzle under the drive of the electric mechanism, so as to change the flow area of ​​the oil nozzle through hole.

[0007] Preferably, a first sealing ring and a first retaining spring are arranged between the lower outer wall of the oil nozzle seat and the inner wall of the shell, a second sealing ring and a second retaining spring are arranged between the lower outer wall of the rod portion of the inner cage sleeve and the lower inner wall of the positioning sleeve, and a third sealing ring and a third retaining spring are arranged between the middle outer wall of the rod portion of the inner cage sleeve and the upper inner wall of the positioning sleeve.

[0008] Preferably, the upper end surface of the shell is fixedly connected to the lower end surface of the end cover by bolts, and the internal step of the end cover and the upper end surface of the positioning sleeve are positioned by positioning pins.

[0009] Preferably, the oil nozzle is a cylindrical axially open hole component, a throttling flow hole is opened on the upper cylindrical surface of the oil nozzle, the opening axes of the throttling flow holes are arranged in pairs along the axial symmetry plane of the oil nozzle, and there are 8 pairs of throttling flow holes arranged along the cylindrical surface, and the axes of two adjacent pairs of throttling flow holes form an angle of 90°. The lower inner hole of the oil nozzle is truncated cone-shaped, and the diameter of the lower inner hole of the oil nozzle away from the throttling flow hole is larger.

[0010] Preferably, the throttling flow holes include large through holes and small through holes, and the throttling flow holes are arranged in a spiral on the cylindrical surface of the oil nozzle. The throttling flow holes are arranged in a spiral form from bottom to top in the order of small through hole, small through hole, large through hole, large through hole, small through hole, and small through hole, and the vertical spacing between the centers of two adjacent throttling flow holes is equal to the radius of the large through hole.

[0011] Preferably, the upper end surface of the outer cage sleeve is provided with limiting teeth, and the lower end surface of the positioning sleeve is provided with a groove, and the limiting teeth cooperate with the groove.

[0012] Preferably, the outer cage sleeve is a cylindrical axially open member, and outer cage sleeve through holes are opened on the cylindrical surface of the outer cage sleeve, and the outer cage sleeve through holes are arranged in a "well" shape. The outer cage sleeve through holes are arranged in four layers on the cylindrical surface along the axial direction of the outer cage sleeve, and the positions of the outer cage sleeve through holes are symmetrical about the axial direction of the outer cage sleeve. The outer cage sleeve through holes form 8 groups along the axial direction of the outer cage sleeve, and the axes of two adjacent groups of outer cage sleeve through holes form an angle of 90°. The opening axis of the outer cage sleeve through hole close to the radial hole side is perpendicular to the radial hole axis or is not in the same straight line.

[0013] Preferably, a method for using the adjustable, erosion-resistant new double-cage oil nozzle as described in any one of the above items comprises the following steps:

[0014] Step 1: Connect the radial hole to the pressure end, connect the end of the axial through hole away from the end cover to the downstream pipeline, and connect the upper end of the inner cage to the electric mechanism;

[0015] Step 2: The high-pressure and high-speed fluid medium enters the radial hole from the pressure end, enters the reserved space between the nozzle, the outer cage and the inner cage through the through hole on the outer cage, then enters the inner hole of the nozzle through the through hole on the nozzle, and flows out from the axial through hole to the downstream pipeline;

[0016] Step 3: Driven by the electric mechanism, the inner cage moves up and down along the axis of the nozzle, changing the flow area of ​​the nozzle through hole and controlling the flow rate of the high-pressure and high-speed fluid medium.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] (1) The present invention adopts a double cage structure, i.e., an outer cage and an inner cage, so that the entering high-pressure and high-speed fluid medium first acts on the outer cylindrical surface of the outer cage, thereby avoiding the direct effect of the high-pressure and high-speed fluid medium on the outer cylindrical surface of the nozzle and the throttling hole and other key parts, which is conducive to improving the erosion problem of the nozzle;

[0019] (2) The through holes on the outer cage sleeve of the present invention are distributed in a "well" shape, and it is ensured that at the proximal end of the radial hole, the axis of the through hole on the outer cage sleeve is perpendicular to the axis of the radial hole or is not in the same straight line. By forcibly interfering with the flow velocity and direction of the high-pressure and high-speed fluid medium, a relatively stable and ideal flow field and pressure field can be formed between the outer cylindrical surface of the nozzle and the inner cylindrical surface of the outer cage sleeve. In particular, after the fluids collide, their flow direction acts on the outer cylindrical surface of the nozzle at a smaller incident angle, thereby further reducing the influence of erosion on the nozzle;

[0020] (3) The "small-large-small" through-hole size combined with the spiral arrangement structure adopted by the oil nozzle of the present invention can effectively improve the control accuracy of the oil nozzle when the through-hole is large or small, which is beneficial to increase production, reliability and stability;

[0021] (4) The inner cage sleeve of the present invention moves up and down along the axis of the oil nozzle under the drive of the electric mechanism, changes the flow area of ​​the throttling flow hole, and controls the flow rate of the high-pressure and high-speed fluid medium. The outer cage sleeve can play a protective role in the throttling control of the inner cage sleeve. The outer cage sleeve has a simple structure and is easy to install and replace, and has good economic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 , a schematic diagram of the main cross-sectional structure of an adjustable, erosion-resistant new double-cage oil nozzle of the present invention;

[0023] Figure 2 , an explosion diagram of an adjustable, erosion-resistant new double-cage oil nozzle of the present invention;

[0024] Figure 3 , a schematic diagram of the initial state of an adjustable, erosion-resistant new double-cage oil nozzle of the present invention;

[0025] Figure 4 , a schematic diagram of the working state of a novel adjustable, erosion-resistant double-cage oil nozzle of the present invention;

[0026] Figure 5 , a schematic diagram of a top view and cross-sectional structure of an adjustable, erosion-resistant new double-cage oil nozzle of the present invention;

[0027] Figure 6 , a schematic diagram of the structure of an adjustable, erosion-resistant new double-cage oil nozzle of the present invention;

[0028] Figure 7 , the circumferential expansion distribution diagram of the throttling hole of the adjustable, erosion-resistant new double-cage oil nozzle of the present invention;

[0029] Figure 8 , a schematic diagram of the main cross-sectional structure of an outer cage of an adjustable, erosion-resistant new double-cage oil nozzle of the present invention;

[0030] Fig. 9 , a schematic diagram of the top view of the cross-sectional structure of the outer cage of an adjustable, erosion-resistant new double-cage oil nozzle of the present invention.

[0031] Description of reference numerals:

[0032] 1. Sealing ring, 2. Nozzle seat, 3. Nozzle, 4. Outer cage, 5. Vent nozzle, 6. Housing, 7. Inner cage, 8. Second retaining ring, 9. Second sealing ring, 10. Positioning sleeve, 11. Third retaining ring, 12. End cover, 13. Flat key, 14. Third sealing ring, 15. Bolt, 16. Positioning pin, 17. Flange, 18. First retaining ring;

[0033] 3-1, throttling hole, 3-2, spiral line;

[0034] 4-1, outer cage through hole, 4-2, limiting teeth;

[0035] 6-1, axial through hole, 6-2, radial hole;

[0036] 7-1, cage part, 7-2, rod part. DETAILED DESCRIPTION

[0037] The specific implementation mode of the present invention is described below in conjunction with embodiments:

[0038] It should be noted that the structures, proportions, sizes, etc. shown in this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0039] At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0040] Example 1

[0041] like Figures 1 to 4As shown, the present invention discloses an adjustable, erosion-resistant new double-cage oil nozzle, comprising an oil nozzle seat 2, an oil nozzle 3, an outer cage sleeve 4, a shell 6, an inner cage sleeve 7, a positioning sleeve 10 and an end cover 12, wherein the shell 6 is provided with an axial through hole 6-1 and a radial hole 6-2, the oil nozzle seat 2 is sleeved and fixed on the lower side of the axial through hole 6-1 of the shell 6, the lower outer wall of the oil nozzle 3 is interference-fitted with the inner hole of the oil nozzle seat 2, the lower inner wall of the inner cage sleeve 7 is gap-fitted with the upper outer wall of the oil nozzle 3, and a reserved space is provided between the lower end of the inner cage sleeve 7 and the upper end of the oil nozzle seat 2, a through hole is provided in the circumference of the oil nozzle 3, the upper end of the inner cage sleeve 7 passes through the positioning sleeve 10 and the end cover 12 in sequence, the middle outer wall of the inner cage sleeve 7 is gap-fitted with the inner hole of the positioning sleeve 10, and the inner cage sleeve 7 is The upper outer wall is key-connected with the inner hole of the end cover 12, the outer cage sleeve 4 is arranged at the intersection of the axial through hole 6-1 and the radial hole 6-2, the inner wall of the outer cage sleeve 4 is gap-matched with the outer wall of the inner cage sleeve 7, the outer cage sleeve 4 is circumferentially provided with through holes, the through holes of the outer cage sleeve 4 correspond to the distribution positions of the through holes of the oil nozzle 3, the end cover 12 is fixed to an end face of the axial through hole 6-1 of the shell 6 away from the oil nozzle seat 2, the positioning sleeve 10 is limited in the space formed by the inner hole of the end cover 12 and the axial through hole 6-1 of the shell 6, the lower end face of the positioning sleeve 10 is matched with the upper end face of the outer cage sleeve 4, the positioning sleeve 10 presses the outer cage sleeve 4 against the upper end face of the oil nozzle seat 2, and the inner hole axes of the oil nozzle seat 2, the oil nozzle 3, the outer cage sleeve 4, the inner cage sleeve 7, the positioning sleeve 10 and the end cover 12 coincide.

[0042] The oil nozzle seat 2 is fixedly connected to the housing 6 via threads.

[0043] Example 2

[0044] like Figure 1 As shown, preferably, the radial hole 6-2 is arranged in the middle position of the shell 6, the end face of the radial hole 6-2 is welded to the flange 17, and a vent nozzle 5 is arranged on one side wall at the intersection of the axial through hole 6-1 and the radial hole 6-2 of the shell 6, the flange 17 is connected to the pressure end and is the medium inlet, and the end of the axial through hole 6-1 close to the oil nozzle seat 2 is connected to the downstream pipeline and is the medium outlet.

[0045] The axial through hole 6-1 and the radial hole 6-2 are perpendicular to each other. The axial through hole 6-1 penetrates the shell 6 in the axial direction, and the radial hole 6-2 penetrates at one end of the shell 6 in the radial direction and does not penetrate at the other end.

[0046] The inner walls of the axial through hole 6 - 1 and the radial hole 6 - 2 are provided with a strengthening layer.

[0047] Example 3

[0048] like Figure 2As shown, preferably, the inner cage 7 is composed of a cage part 7-1 and a rod part 7-2, the cage part 7-1 and the end of the rod part 7-2 are coaxially connected, the inner wall of the cage part 7-1 and the outer wall of the oil nozzle 3 are gap-matched, and the gap is 0.2mm, the outer wall of the cage part 7-1 and the inner wall of the outer cage 4 are gap-matched, and the gap is 0.5mm, the rod part 7-2 passes through the inner holes of the positioning sleeve 10 and the end cover 12 in sequence, and the gap between the rod part 7-2 and the positioning sleeve 10 is The rod 7-2 is provided with a thread on its upper side, a keyway is provided on its outer wall, a keyway is provided on its inner wall, and the keyway of the end cover 12 is provided in a strip shape along the axial direction of the end cover 12. The flat key 13 is installed in the keyway of the end cover 12 and the keyway of the rod 7-2. The end of the rod 7-2 away from the cage part 7-1 is externally connected to an electric mechanism. Driven by the electric mechanism, the inner cage 7 moves up and down in the reserved space along the axis of the oil nozzle 3 to change the flow area of ​​the through hole of the oil nozzle 3.

[0049] The thread arranged on the upper side of the rod portion 7 - 2 is threadably connected to the electric mechanism.

[0050] The cage part 7 - 1 is a cylindrical hole part, and the inner wall and outer wall of the cage part 7 - 1 are clearance-matched with the oil nozzle 3 and the outer cage 4 respectively.

[0051] Example 4

[0052] like Figure 1~2 As shown, preferably, a first sealing ring 1 and a first retaining spring 18 are arranged between the lower outer wall of the oil nozzle seat 2 and the inner wall of the shell 6, a second sealing ring 9 and a second retaining spring 8 are arranged between the lower outer wall of the rod portion 7-2 of the inner cage sleeve 7 and the lower inner wall of the positioning sleeve 10, and a third sealing ring 14 and a third retaining spring 11 are arranged between the middle outer wall of the rod portion 7-2 of the inner cage sleeve 7 and the upper inner wall of the positioning sleeve 10.

[0053] The sealing ring and the retaining spring are used for sealing and limiting the sealing member to prevent the medium from flowing out from the gap between the oil nozzle seat 2 and the housing 6 and to prevent the medium from flowing out from the gap between the inner cage sleeve 7 and the positioning sleeve 10.

[0054] Preferably, the upper end surface of the housing 6 is fixedly connected to the lower end surface of the end cover 12 by bolts 15 , and the inner step of the end cover 12 and the upper end surface of the positioning sleeve 10 are positioned by positioning pins 16 .

[0055] Example 5

[0056] like Figure 6As shown, preferably, the oil nozzle 3 is a cylindrical axial opening component, and a throttling flow hole 3-1 is opened on the upper cylindrical surface of the oil nozzle 3, and the opening axes of the throttling flow holes 3-1 are arranged in pairs along the axial symmetry plane of the oil nozzle 3. There are 8 pairs of throttling flow holes 3-1 arranged along the cylindrical surface, and the axes of two adjacent pairs of throttling flow holes 3-1 form an angle of 90°. The lower inner hole of the oil nozzle 3 is truncated cone-shaped, and the diameter of the lower inner hole of the oil nozzle 3 away from the throttling flow hole 3-1 is larger.

[0057] Preferably, the throttling flow holes 3-1 include large through holes and small through holes, and the throttling flow holes 3-1 are arranged in a spiral on the cylindrical surface of the oil nozzle 3. The throttling flow holes 3-1 are arranged in a spiral form from bottom to top in the order of small through hole, small through hole, large through hole, large through hole, small through hole, and small through hole, and the vertical spacing between the centers of two adjacent throttling flow holes 3-1 is equal to the radius of the large through hole.

[0058] like Figure 6 , 7 As shown, the throttling holes 3-1 are distributed along the spiral line 3-2.

[0059] like Figure 7 As shown, the diameters of the through holes on the outer cylindrical surface of the oil nozzle 3 are 3mm, 3mm, 4mm, 13mm, 13mm, 4mm, 3mm, 3mm from bottom to top, forming a "small-large-small" structure, and the vertical spacing between the centers of two adjacent holes is equal to the radius of the large through hole.

[0060] Example 6

[0061] like Figure 8 , 9 As shown, preferably, the upper end surface of the outer cage sleeve 4 is provided with a limiting tooth 4-2, and the lower end surface of the positioning sleeve 10 is provided with a groove, and the limiting tooth 4-2 cooperates with the groove.

[0062] like Fig. 9 As shown, preferably, the outer cage sleeve 4 is a cylindrical axial open hole part, and an outer cage sleeve through hole 4-1 is opened on the cylindrical surface of the outer cage sleeve 4, and the outer cage sleeve through holes 4-1 are arranged in a "well" shape. The outer cage sleeve through holes 4-1 are arranged in four layers on the cylindrical surface along the axial direction of the outer cage sleeve 4, and the positions of the outer cage sleeve through holes 4-1 are symmetrical about the axial direction of the outer cage sleeve 4. The outer cage sleeve through holes 4-1 form 8 groups along the axial direction of the outer cage sleeve 4, and the axes of two adjacent groups of outer cage sleeve through holes 4-1 are at an angle of 90°. The opening axis of the outer cage sleeve through hole 4-1 close to the radial hole 6-2 is perpendicular to the axis of the radial hole 6-2 or is not in the same straight line.

[0063] The through holes on the cylindrical surface of the outer cage sleeve 4 have a diameter of 4 mm at the proximal end of the entrance of the radial hole 6-2, and a total of 8 through holes, and have a diameter of 6 mm at the distal end of the entrance of the radial hole 6-2, and a total of 8 through holes.

[0064] Preferably, a method for using the adjustable, erosion-resistant new double-cage oil nozzle as described in any one of the above items comprises the following steps:

[0065] Step 1: Connect the radial hole 6-2 to the pressure end, connect the end of the axial through hole 6-1 away from the end cover 12 to the downstream pipeline, and connect the upper end of the inner cage 7 to the electric mechanism;

[0066] Step 2: The high-pressure and high-speed fluid medium enters the radial hole 6-2 from the pressure end, enters the reserved space between the oil nozzle 3, the outer cage 4 and the inner cage 7 through the through hole on the outer cage 4, and then enters the inner hole of the oil nozzle 3 through the through hole on the oil nozzle 3, and flows out from the axial through hole 6-1 to the downstream pipeline;

[0067] Step 3: The inner cage 7 moves up and down along the axis of the nozzle 3 under the drive of the electric mechanism, changing the flow area of ​​the through hole of the nozzle 3 and controlling the flow rate of the high-pressure and high-speed fluid medium.

[0068] The working principle of the present invention is as follows:

[0069] like Figures 1 to 4 As shown, the present invention provides an adjustable, erosion-resistant new double-cage oil nozzle, which is composed of an oil nozzle seat 2, an oil nozzle 3, an outer cage 4, a shell 6, an inner cage 7, a positioning sleeve 10 and an end cover 12. The present invention adopts a double-cage structure, so that the entering high-pressure and high-speed fluid medium first acts on the outer cylindrical surface of the outer cage 4, avoiding the direct effect of the high-pressure and high-speed fluid medium on the outer cylindrical surface of the oil nozzle 3 and key parts such as the throttling hole, and by forcibly intervening the flow velocity and direction of the high-pressure and high-speed fluid medium, a more stable and ideal flow field and pressure field can be formed between the outer cylindrical surface of the oil nozzle 3 and the inner cylindrical surface of the outer cage 4, reducing the influence of erosion on the oil nozzle; at the same time, the "small-large-small" through-hole size combined with the spiral arrangement structure adopted by the oil nozzle of the present invention can effectively improve the control accuracy of the oil nozzle in large through-holes and small through-holes, which is beneficial to increasing production, reliability and stability.

[0070] The through holes on the outer cage sleeve of the present invention are distributed in a "well" shape, and ensure that at the proximal end of the radial hole, the axis of the through hole on the outer cage sleeve is perpendicular to the axis of the radial hole or is not in the same straight line. By forcibly intervening the flow velocity and direction of the high-pressure and high-speed fluid medium, a relatively stable and ideal flow field and pressure field can be formed between the outer cylindrical surface of the oil nozzle and the inner cylindrical surface of the outer cage sleeve. In particular, after the fluids collide, their flow direction acts on the outer cylindrical surface of the oil nozzle at a smaller incident angle, thereby further reducing the influence of erosion on the oil nozzle.

[0071] The inner cage sleeve of the present invention moves up and down along the axis of the oil nozzle under the drive of the electric mechanism, changes the flow area of ​​the throttling flow hole, and controls the flow rate of the high-pressure and high-speed fluid medium. The outer cage sleeve can protect the throttling control of the inner cage sleeve. The outer cage sleeve has a simple structure, is easy to install and replace, and has good economy.

[0072] When using:

[0073] The flange 17 of the present invention is connected to the pressure end, the axial through hole 6-1 is connected to the downstream pipeline, and the upper rod portion 7-2 of the inner cage sleeve 7 is connected to the electric mechanism.

[0074] like Figure 3 As shown, in the initial state of the double cage oil nozzle, the inner cage 7 falls down and contacts the oil nozzle seat 2, the reserved space between the outer cage 4 and the oil nozzle 3 is compressed to the minimum, and the through holes on the outer cage 4 and the oil nozzle 3 are not connected.

[0075] like Figure 4 As shown, the double cage oil nozzle is in working state, the inner cage 7 leaves the oil nozzle seat 2 and rises to the maximum position, the reserved space between the outer cage 4 and the oil nozzle 3 is expanded to the maximum, and the through holes on the outer cage 4 and the oil nozzle 3 are connected.

[0076] like Figure 5 As shown, the high-pressure and high-speed fluid medium enters the radial hole 6-2 from the pressure end, collides head-on with the outer wall of the outer cage sleeve 4 to avoid erosion of the oil nozzle due to excessive pressure, then bypasses the side and enters the oil nozzle 3 through the through hole on the outer cage sleeve 4, the reserved space between the outer cage sleeve 4 and the inner cage sleeve 7, and then enters the inner hole of the oil nozzle 3 through the through hole on the oil nozzle 3, and flows out to the downstream pipeline through the axial through hole 6-1; the inner cage sleeve 7 moves up and down along the axis of the oil nozzle 3 under the drive of the electric mechanism, changes the flow area of ​​the through hole of the oil nozzle 3, and controls the flow rate of the high-pressure and high-speed fluid medium.

[0077] The invention is beneficial in that it improves the erosion problem of the oil nozzle in the prior art, optimizes the regulation, improves the reliability and stability, and promotes the economic benefits.

[0078] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

[0079] Many other changes and modifications may be made without departing from the concept and scope of the present invention.It should be understood that the present invention is not limited to the specific embodiments, and the scope of the present invention is defined by the appended claims.

Claims

1. A new type of adjustable, erosion-resistant double-cage oil nozzle, characterized by: The invention comprises a nozzle seat (2), a nozzle (3), an outer cage sleeve (4), a housing (6), an inner cage sleeve (7), a positioning sleeve (10) and an end cover (12), wherein the housing (6) is provided with an axial through hole (6-1) and a radial hole (6-2), the nozzle seat (2) is fitted on and fixed to the lower side of the axial through hole (6-1) of the housing (6), the lower outer wall of the nozzle (3) is interference-fitted with the inner hole of the nozzle seat (2), the lower inner wall of the inner cage sleeve (7) is clearance-fitted with the upper outer wall of the nozzle (3), and the inner cage sleeve (7) is A reserved space is provided between the lower end and the upper end of the nozzle seat (2), a through hole is provided in the circumference of the nozzle (3), the upper end of the inner cage sleeve (7) passes through the positioning sleeve (10) and the end cover (12) in sequence, the middle outer wall of the inner cage sleeve (7) is clearance-matched with the inner hole of the positioning sleeve (10), the upper outer wall of the inner cage sleeve (7) is key-connected with the inner hole of the end cover (12), the outer cage sleeve (4) is provided at the intersection of the axial through hole (6-1) and the radial hole (6-2), the inner wall of the outer cage sleeve (4) is clearance-matched with the outer wall of the inner cage sleeve (7), and the outer cage sleeve (4) is provided at the intersection of the axial through hole (6-1) and the radial hole (6-2). The sleeve (4) is provided with through holes in the circumference, and the through holes of the outer cage sleeve (4) correspond to the distribution positions of the through holes of the oil nozzle (3). The end cover (12) is fixed to an end face of the axial through hole (6-1) of the shell (6) away from the oil nozzle seat (2). The positioning sleeve (10) is limited in the space formed by the inner hole of the end cover (12) and the axial through hole (6-1) of the shell (6). The lower end face of the positioning sleeve (10) cooperates with the upper end face of the outer cage sleeve (4). The positioning sleeve (10) presses the outer cage sleeve (4) against the upper end face of the oil nozzle seat (2), and the oil nozzle The inner hole axes of the seat (2), the oil nozzle (3), the outer cage sleeve (4), the inner cage sleeve (7), the positioning sleeve (10) and the end cover (12) coincide with each other; the inner cage sleeve (7) is composed of a cage sleeve part (7-1) and a rod part (7-2); the ends of the cage sleeve part (7-1) and the rod part (7-2) are coaxially connected; the inner wall of the cage sleeve part (7-1) and the outer wall of the oil nozzle (3) are clearance-matched, and the clearance is 0.2 mm; the outer wall of the cage sleeve part (7-1) and the inner wall of the outer cage sleeve (4) are clearance-matched, and the clearance is 0.5mm, the rod (7-2) passes through the inner holes of the positioning sleeve (10) and the end cover (12) in sequence, the rod (7-2) and the positioning sleeve (10) are clearance-matched, the upper side of the rod (7-2) is provided with a thread, the outer wall of the rod (7-2) is provided with a keyway, the inner wall of the end cover (12) is provided with a keyway, the keyway of the end cover (12) is provided with a strip along the axial direction of the end cover (12), the flat key (13) is fitted in the keyway of the end cover (12) and the keyway of the rod (7-2), the end of the rod (7-2) away from the cage part (7-1) is externally connected to the electric mechanism, the inner cage (7) moves up and down along the axis of the oil nozzle (3) in the reserved space under the drive of the electric mechanism, and is used to change the flow area of ​​the through hole of the oil nozzle (3); the upper end surface of the outer cage (4) is provided with a limit tooth ( 4-2), the lower end surface of the positioning sleeve (10) is provided with a groove, and the limiting tooth (4-2) cooperates with the groove; the outer cage sleeve (4) is a cylindrical axial opening member, and the cylindrical surface of the outer cage sleeve (4) is provided with an outer cage sleeve through hole (4-1), and the outer cage sleeve through holes (4-1) are arranged in a "well" shape, and the outer cage sleeve through holes (4-1) are arranged in four layers on the cylindrical surface along the axis direction of the outer cage sleeve (4), and the positions of the outer cage sleeve through holes (4-1) are symmetrical about the axis of the outer cage sleeve (4), and the outer cage sleeve through holes (4-1) form 8 groups along the axis direction of the outer cage sleeve (4), and the axes of two adjacent groups of outer cage sleeve through holes (4-1) form an angle of 90 degrees, and the opening axis of the outer cage sleeve through hole (4-1) close to the radial hole (6-2) is perpendicular to the axis of the radial hole (6-2) or is not in the same straight line.

2. The adjustable, erosion-resistant new double-cage oil nozzle according to claim 1 is characterized by: The radial hole (6-2) is arranged in the middle of the shell (6), and the end face of the radial hole (6-2) is welded to the flange (17). A venting nozzle (5) is provided on one side wall of the intersection of the axial through hole (6-1) and the radial hole (6-2) of the shell (6). The flange (17) is connected to the pressure end and serves as the medium inlet. The end of the axial through hole (6-1) close to the oil nozzle seat (2) is connected to the downstream pipeline and serves as the medium outlet.

3. The adjustable, erosion-resistant new double-cage oil nozzle according to claim 1 is characterized by: A first sealing ring (1) and a first retaining spring (18) are provided between the lower outer wall of the oil nozzle seat (2) and the inner wall of the housing (6); a second sealing ring (9) and a second retaining spring (8) are provided between the lower outer wall of the rod portion (7-2) of the inner cage sleeve (7) and the lower inner wall of the positioning sleeve (10); and a third sealing ring (14) and a third retaining spring (11) are provided between the middle outer wall of the rod portion (7-2) of the inner cage sleeve (7) and the upper inner wall of the positioning sleeve (10).

4. The adjustable, erosion-resistant new double-cage oil nozzle according to claim 1 is characterized by: The upper end surface of the housing (6) and the lower end surface of the end cover (12) are fixedly connected by bolts (15), and the inner step of the end cover (12) and the upper end surface of the positioning sleeve (10) are positioned by positioning pins (16).

5. The adjustable, erosion-resistant new double-cage oil nozzle according to claim 1 is characterized by: The oil nozzle (3) is a cylindrical axially open-hole component. A throttling flow hole (3-1) is opened on the upper cylindrical surface of the oil nozzle (3). The opening axes of the throttling flow holes (3-1) are arranged in pairs along the axial symmetry plane of the oil nozzle (3). A total of 8 pairs of throttling flow holes (3-1) are arranged along the cylindrical surface. The axes of two adjacent pairs of throttling flow holes (3-1) form an angle of 90°. The lower inner hole of the oil nozzle (3) is truncated cone-shaped. The diameter of the lower inner hole of the oil nozzle (3) away from the throttling flow hole (3-1) is larger.

6. The adjustable, erosion-resistant new double-cage oil nozzle according to claim 5 is characterized by: The throttling holes (3-1) include a large through hole and a small through hole. The throttling holes (3-1) are arranged in a spiral on the cylindrical surface of the oil nozzle (3). The throttling holes (3-1) are arranged in a spiral form from bottom to top in the order of small through hole, small through hole, large through hole, large through hole, small through hole, and small through hole. The vertical distance between the centers of two adjacent throttling holes (3-1) is equal to the radius of the large through hole.

7. A method for using the adjustable, erosion-resistant new double-cage oil nozzle according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Connect the radial hole (6-2) to the pressure end, connect the end of the axial through hole (6-1) away from the end cover (12) to the downstream pipeline, and connect the upper end of the inner cage (7) to the electric mechanism; Step 2: The high-pressure and high-speed fluid medium enters the radial hole (6-2) from the pressure end, enters the oil nozzle (3) through the through hole on the outer cage (4), and enters the reserved space between the outer cage (4) and the inner cage (7), then enters the inner hole of the oil nozzle (3) through the through hole on the oil nozzle (3), and flows out from the axial through hole (6-1) to the downstream pipeline; Step 3: The inner cage (7) moves up and down along the axis of the oil nozzle (3) under the drive of the electric mechanism, changing the flow area of ​​the through hole of the oil nozzle (3) and controlling the flow rate of the high-pressure and high-speed fluid medium.

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