Double-self-oscillation pulse porous water jet nozzle

Abstract

The invention belongs to the technical field of high-pressure water jet rock breaking and well drilling, and particularly relates to a double-self-oscillation pulse porous water jet nozzle which comprises a water jet input section, a water jet output section and a water jet output section. The self-excited oscillation cavity section is detachably connected with the water jet input section, a first self-excited oscillation part is arranged at one end of the self-excited oscillation cavity section and used for conducting first-time self-excited oscillation on high-pressure water, and a second self-excited oscillation part is arranged at the other end of the self-excited oscillation cavity section and used for conducting second-time self-excited oscillation on high-pressure water; the second self-excited oscillation part is used for carrying out second self-excited oscillation on the high-pressure water subjected to the first self-excited oscillation; the water jet output section is detachably connected with the self-excited oscillation cavity section, a third self-excited oscillation part is arranged at one end of the water jet output section, the third self-excited oscillation part and the second self-excited oscillation part jointly carry out second-time self-excited oscillation on the high-pressure water, and a porous jet part is arranged at the other end of the water jet output section and communicates with the third self-excited oscillation part.

Description

Technical Field

[0001] The invention belongs to the technical field of high-pressure water jet rock breaking and drilling, and in particular relates to a dual self-excited oscillation pulse porous water jet nozzle. Background Art

[0002] Affected by geological structure, the permeability of coal seams in most mining areas is low, and coal seam gas mining is difficult. In order to improve the permeability of coal seams and mine coal seam gas more efficiently, self-excited oscillation pulse water jet drill bits are used. Among them, the dual self-excited oscillation pulse porous jet drill bit has the characteristics of strong hole-forming effect, large hole-forming area, and high rock breaking efficiency when the jet impacts coal and rock, which meets the requirements of coal seam drilling. However, the traditional self-excited oscillation jet drill bit has a small hole-forming area and weak effect, and is not efficient during the drilling process.

[0003] High-pressure water jet rock breaking is a coal and rock crushing technology that uses high-speed "water arrows" to impact, crush and erode. Its auxiliary effect has been proven to improve the rock breaking ability of tools and extend the service life of tools. However, the large amount of water consumed by continuous high-pressure water jets will cause large areas of water accumulation in the coal and rock crushing machinery workplace, making it difficult for the equipment to work normally. Common continuous water jet assisted rock breaking only produces a single "water hammer pressure" and has limited impact rock breaking ability. The subsequent low "stagnation pressure" makes it difficult to aggravate the internal damage and crack propagation of hard coal and rock, resulting in its failure to be widely used in hard coal and rock crushing equipment. The ability of pulse jet impact crushing coal and rock is much stronger than that of continuous jet. Pulse jet assisted rock breaking can intermittently generate multiple "water hammer pressures". The superposition and reflection of multi-source compression stress waves inside the coal and rock cause volume crushing and fatigue damage of the coal and rock.

[0004] Therefore, it is necessary to design a dual self-excited oscillation pulse porous water jet nozzle to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a dual self-excited oscillation pulse porous water jet nozzle to solve the above problems and achieve the purpose of increasing the hole forming area and rock breaking efficiency.

[0006] To achieve the above object, the present invention provides the following solution: a dual self-excited oscillation pulse multi-hole water jet nozzle, comprising

[0007] A water jet input section, one end of which is an input end and the other end is an output end, and high-pressure water enters the water jet input section from the input end;

[0008] A self-excited oscillation cavity section is detachably connected to the water jet input section, a first self-excited oscillation part is provided at one end of the self-excited oscillation cavity section, the first self-excited oscillation part is connected to the output end of the water jet input section, the first self-excited oscillation part is used to perform a first self-excited oscillation on the high-pressure water, and a second self-excited oscillation part is provided at the other end of the self-excited oscillation cavity section, the second self-excited oscillation part is connected to the first self-excited oscillation part, and the second self-excited oscillation part is used to perform a second self-excited oscillation on the high-pressure water after the first self-excited oscillation;

[0009] A water jet output section is detachably connected to the self-excited oscillation cavity section, a third self-excited oscillation part is provided at one end of the water jet output section, the third self-excited oscillation part is connected to the second self-excited oscillation part, the third self-excited oscillation part and the second self-excited oscillation part jointly perform a second self-excited oscillation on the high-pressure water, and a porous jet part is provided at the other end of the water jet output section, the porous jet part is connected to the third self-excited oscillation part.

[0010] Based on a dual self-excited oscillation pulse porous water jet nozzle of the present invention, the first self-excited oscillation part includes a first self-excited oscillation cavity, the first self-excited oscillation cavity is opened inside one end where the self-excited oscillation cavity section is connected to the water jet input section, one end of the first self-excited oscillation cavity is connected to the water jet input section, the inner wall of the other end of the first self-excited oscillation cavity is set to an inclined state with a high center and a low edge, the other end of the first self-excited oscillation cavity is connected to one end of a fluid pipeline, and the other end of the fluid pipeline is connected to the second self-excited oscillation part.

[0011] Based on a dual self-excited oscillation pulse porous water jet nozzle of the present invention, the second self-excited oscillation part includes a second self-excited oscillation cavity, the second self-excited oscillation cavity is opened inside the end where the self-excited oscillation cavity section is connected to the water jet output section, one end of the second self-excited oscillation cavity is connected to the fluid pipeline, and the other end of the second self-excited oscillation cavity is connected to the water jet output section.

[0012] Based on a dual self-excited oscillation pulse porous water jet nozzle of the present invention, the third self-excited oscillation part includes a third self-excited oscillation cavity, the third self-excited oscillation cavity is opened at one end where the water jet output section is connected to the self-excited oscillation cavity section, one end of the third self-excited oscillation cavity is connected to the second self-excited oscillation cavity, and the other end of the third self-excited oscillation cavity is connected to the porous jet part.

[0013] A dual self-excited oscillation pulse porous water jet nozzle based on the present invention, the porous jet part includes a central hole and a plurality of jet holes, the plurality of jet holes are circumferentially evenly spaced outside the central hole, the central hole is connected to the center of the third self-excited oscillation cavity, and the plurality of jet holes are connected to the outer edge of the third self-excited oscillation cavity.

[0014] According to the dual self-excited oscillation pulsed porous water jet nozzle of the present invention, a fluid channel is coaxially opened inside the water jet input section, and the fluid channel is connected to the first self-excited oscillation cavity.

[0015] A dual self-excited oscillation pulse porous water jet nozzle based on the present invention, wherein one end of the first self-excited oscillation cavity close to the water jet input section is a first inlet, one end of the second self-excited oscillation cavity close to the fluid pipeline is a second inlet, and the other end is a second outlet, the diameter ratio of the first inlet to the second inlet, the diameter ratio of the second inlet to the second outlet, and the diameter ratio of the first inlet to the second outlet are all 1.2-1.4, and the length ratio of the first inlet to the second inlet, the length ratio of the second inlet to the second outlet, and the length ratio of the first inlet to the second outlet are all 1.6-1.8.

[0016] In the dual self-excited oscillation pulse porous water jet nozzle according to the present invention, the cavity diameter ratio of the first self-excited oscillation cavity to the second self-excited oscillation cavity is 0.3-0.4.

[0017] According to the dual self-excited oscillation pulse porous water jet nozzle of the present invention, the collision angles of the first self-excited oscillation cavity and the second self-excited oscillation cavity are both 50°-70°.

[0018] Compared with the prior art, the present invention has the following advantages and technical effects:

[0019] The invention has simple structure, small size, strong maintainability, strong hole-forming effect, large hole-forming area and high rock-breaking efficiency. It has a small turning radius and is better suitable for radial drilling; the dual self-excited oscillation pulse porous water jet nozzle increases the effective drilling surface and obtains better drilling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0021] Figure 1 It is an overall schematic diagram of the present invention;

[0022] Figure 2 It is a cross-sectional view of the present invention;

[0023] Figure 3 This is a schematic diagram of the water jet input section of the present invention;

[0024] Figure 4 It is a schematic diagram of the self-excited oscillation cavity section of the present invention;

[0025] Figure 5 It is a schematic diagram of the water jet output section of the present invention;

[0026] Figure 6 It is a cross-sectional view of the water jet output section of the present invention.

[0027] Among them, 1, water jet input section; 1a, first internal thread; 1b, first external thread; 1c, fluid channel; 2, self-excited oscillation cavity section; 2a, second internal thread; 2b, first self-excited oscillation cavity; 2c, fluid pipeline; 2d, second self-excited oscillation cavity; 2e, second external thread; 3, water jet output section; 3a, third internal thread; 3b, third self-excited oscillation cavity; 3c, center hole; 3d, jet hole. DETAILED DESCRIPTION

[0028] 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.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Reference Figures 1 to 6 As shown, the present invention provides a dual self-excited oscillation pulse porous water jet nozzle, comprising

[0031] The water jet input section 1 has one end as the input end and the other end as the output end, and high-pressure water enters the water jet input section 1 from the input end;

[0032] The self-excited oscillation cavity section 2 is detachably connected to the water jet input section 1, a first self-excited oscillation part is provided at one end of the self-excited oscillation cavity section 2, the first self-excited oscillation part is connected to the output end of the water jet input section 1, the first self-excited oscillation part is used to perform a first self-excited oscillation on the high-pressure water, and a second self-excited oscillation part is provided at the other end of the self-excited oscillation cavity section 2, the second self-excited oscillation part is connected to the first self-excited oscillation part, and the second self-excited oscillation part is used to perform a second self-excited oscillation on the high-pressure water after the first self-excited oscillation;

[0033] The water jet output section 3 is detachably connected to the self-excited oscillation cavity section 2. A third self-excited oscillation part is provided at one end of the water jet output section 3. The third self-excited oscillation part is connected to the second self-excited oscillation part. The third self-excited oscillation part and the second self-excited oscillation part jointly perform a second self-excited oscillation on the high-pressure water. A porous jet part is provided at the other end of the water jet output section 3. The porous jet part is connected to the third self-excited oscillation part.

[0034] The water jet input section 1 is a cylinder with two ends open. The material of the water jet input section 1 is austenitic stainless steel, and the material of the self-excited oscillation cavity section 2 and the water jet output section 3 is ferritic stainless steel; the water jet input section 1, the self-excited oscillation cavity section 2, and the water jet output section 3 are all processed by CNC programming and precision machine tools, and computer-aided design (CAD) and computer-aided manufacturing (CAM) technology are used to perform three-dimensional modeling and path planning of the nozzle to improve the processing accuracy and consistency. The heat treatment process uses quenching and tempering, and the surface treatment process uses spray coating and electrochemical polishing.

[0035] The coaxiality requirement of the matching cylindrical surface or working surface of the water jet input section 1, the self-excited oscillation cavity section 2, and the water jet output section 3 is 0.03-0.05mm, the perpendicularity requirement between the cylindrical surface and the axis is ≤0.05mm, and the tangential hole diameter tolerance is +0.02mm.

[0036] Furthermore, the first self-excited oscillation part includes a first self-excited oscillation cavity 2b, which is opened inside one end of the self-excited oscillation cavity section 2 connected to the water jet input section 1, one end of the first self-excited oscillation cavity 2b is connected to the water jet input section 1, and the inner wall of the other end of the first self-excited oscillation cavity 2b is set to an inclined state with a high center and a low edge, and the other end of the first self-excited oscillation cavity 2b is connected to one end of the fluid pipe 2c, and the other end of the fluid pipe 2c is connected to the second self-excited oscillation part.

[0037] Furthermore, the second self-excited oscillation part includes a second self-excited oscillation cavity 2d, which is opened inside one end of the self-excited oscillation cavity section 2 connected to the water jet output section 3, one end of the second self-excited oscillation cavity 2d is connected to the fluid pipeline 2c, and the other end of the second self-excited oscillation cavity 2d is connected to the water jet output section 3.

[0038] One end of the self-excited oscillation cavity section 2 is provided with a second internal thread 2a, and is threadably connected to the water jet input section 1 through the second internal thread 2a. The other end of the self-excited oscillation cavity section 2 is provided with a second external thread 2e, and is threadably connected to the water jet output section 3 through the second external thread 2e.

[0039] The first self-excited oscillation cavity 2b is a rotating body structure, the upstream of the first self-excited oscillation cavity 2b is the first incident port, and the downstream is the first exit port, wherein the first incident port, the first self-excited oscillation cavity 2b, and the first exit port are connected in sequence, and the inclined inner wall of the first self-excited oscillation cavity 2b is the first inclined collision wall; the second self-excited oscillation cavity 2d is also a rotating body cavity, the second incident port is located upstream of the second self-excited oscillation cavity 2d, the second exit port is located downstream of the second self-excited oscillation cavity 2d, and the side of the second self-excited oscillation cavity 2d is the second inclined collision wall.

[0040] The first self-excited oscillation cavity 2b and the second self-excited oscillation cavity 2d are located on the same axis.

[0041] Furthermore, the third self-excited oscillation part includes a third self-excited oscillation cavity 3b, which is opened at one end where the water jet output section 3 is connected to the self-excited oscillation cavity section 2, one end of the third self-excited oscillation cavity 3b is connected to the second self-excited oscillation cavity 2d, and the other end of the third self-excited oscillation cavity 3b is connected to the porous jet part.

[0042] One end of the water jet output section 3 is provided with a third internal thread 3a, and is detachably connected to the second external thread 2e through the third internal thread 3a.

[0043] Furthermore, the porous jet portion includes a central hole 3c and a plurality of jet holes 3d, wherein the plurality of jet holes 3d are circumferentially evenly spaced outside the central hole 3c, the central hole 3c is connected to the center of the third self-excited oscillation cavity 3b, and the plurality of jet holes 3d are connected to the outer edge of the third self-excited oscillation cavity 3b.

[0044] Furthermore, a fluid channel 1c is coaxially opened inside the water jet input section 1, and the fluid channel 1c is connected to the first self-excited oscillation cavity 2b.

[0045] One end of the water jet input section 1 is provided with a first internal thread 1a, and the water jet input section 1 is connected to an external high-pressure water source through the first internal thread 1a. The other end of the water jet input section 1 is provided with a first external thread 1b, and is detachably connected to the second internal thread 2a through the first external thread 1b.

[0046] Furthermore, one end of the first self-excited oscillation cavity 2b close to the water jet input section 1 is the first inlet, one end of the second self-excited oscillation cavity 2d close to the fluid pipe 2c is the second inlet, and the other end is the second outlet. The diameter ratio of the first inlet to the second inlet, the diameter ratio of the second inlet to the second outlet, and the diameter ratio of the first inlet to the second outlet are all 1.2-1.4, and the length ratio of the first inlet to the second inlet, the length ratio of the second inlet to the second outlet, and the length ratio of the first inlet to the second outlet are all 1.6-1.8.

[0047] Furthermore, the cavity diameter ratio between the first self-excited oscillation cavity 2b and the second self-excited oscillation cavity 2d is 0.3-0.4.

[0048] The cavity diameter ratio is the ratio of the axial length to the longitudinal length of the self-excited oscillation cavity.

[0049] Furthermore, the collision angles of the first self-excited oscillation cavity 2b and the second self-excited oscillation cavity 2d are both 50°-70°, and may be 55° or 60°.

[0050] The working principle of the present invention is as follows:

[0051] High-pressure water enters the first self-excited oscillation cavity 2b of the self-excited oscillation cavity section 2 from the fluid channel 1c of the water jet input section 1, forming an initial pulse jet therein, and then enters the second self-excited oscillation cavity 2d and the third self-excited oscillation cavity 3b, where it undergoes secondary reinforcement. A high-pressure pulse jet is ejected from the central hole 3c, and another three high-pressure continuous jets are ejected from the three jet holes 3d.

[0052] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0053] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope of the present invention.

Claims

1. A dual self-excited oscillation pulsed porous water jet nozzle, characterized in that: include A water jet input section (1), one end of which is an input end and the other end of which is an output end, and high-pressure water enters the water jet input section (1) from the input end; A self-excited oscillation cavity section (2) is detachably connected to the water jet input section (1); a first self-excited oscillation portion is provided at one end of the self-excited oscillation cavity section (2); the first self-excited oscillation portion is connected to the output end of the water jet input section (1); the first self-excited oscillation portion is used to perform a first self-excited oscillation on the high-pressure water; a second self-excited oscillation portion is provided at the other end of the self-excited oscillation cavity section (2); the second self-excited oscillation portion is connected to the first self-excited oscillation portion; the second self-excited oscillation portion is used to perform a second self-excited oscillation on the high-pressure water after the first self-excited oscillation; A water jet output section (3) is detachably connected to the self-excited oscillation cavity section (2); a third self-excited oscillation section is arranged at one end of the water jet output section (3); the third self-excited oscillation section is connected to the second self-excited oscillation section; the third self-excited oscillation section and the second self-excited oscillation section jointly perform a second self-excited oscillation on the high-pressure water; and a multi-porous jet section is arranged at the other end of the water jet output section (3); the multi-porous jet section is connected to the third self-excited oscillation section.

2. A dual self-excited oscillation pulsed porous water jet nozzle according to claim 1, characterized in that: The first self-excited oscillation part comprises a first self-excited oscillation cavity (2b), the first self-excited oscillation cavity (2b) being arranged inside one end of the self-excited oscillation cavity section (2) connected to the water jet input section (1), one end of the first self-excited oscillation cavity (2b) being connected to the water jet input section (1), the inner wall of the other end of the first self-excited oscillation cavity (2b) being arranged in an inclined state with a high center and a low edge, the other end of the first self-excited oscillation cavity (2b) being connected to one end of a fluid pipeline (2c), the other end of the fluid pipeline (2c) being connected to the second self-excited oscillation part.

3. A dual self-excited oscillation pulsed porous water jet nozzle according to claim 2, characterized in that: The second self-excited oscillation part comprises a second self-excited oscillation cavity (2d), the second self-excited oscillation cavity (2d) being arranged inside one end of the self-excited oscillation cavity section (2) connected to the water jet output section (3), one end of the second self-excited oscillation cavity (2d) being connected to the fluid pipeline (2c), and the other end of the second self-excited oscillation cavity (2d) being connected to the water jet output section (3).

4. A dual self-excited oscillation pulsed porous water jet nozzle according to claim 3, characterized in that: The third self-excited oscillation part comprises a third self-excited oscillation cavity (3b), the third self-excited oscillation cavity (3b) being arranged at one end of the water jet output section (3) connected to the self-excited oscillation cavity section (2), one end of the third self-excited oscillation cavity (3b) being connected to the second self-excited oscillation cavity (2d), and the other end of the third self-excited oscillation cavity (3b) being connected to the porous jet part.

5. A dual self-excited oscillation pulsed porous water jet nozzle according to claim 4, characterized in that: The multi-hole jet portion comprises a central hole (3c) and a plurality of jet holes (3d), wherein the plurality of jet holes (3d) are arranged at equal intervals in the circumferential direction outside the central hole (3c), the central hole (3c) is connected to the center of the third self-excited oscillation cavity (3b), and the plurality of jet holes (3d) are connected to the outer edge of the third self-excited oscillation cavity (3b).

6. A dual self-excited oscillation pulsed porous water jet nozzle according to claim 2, characterized in that: A fluid channel (1c) is coaxially provided inside the water jet input section (1), and the fluid channel (1c) is connected to the first self-excited oscillation cavity (2b).

7. The dual self-excited oscillation pulsed porous water jet nozzle according to claim 3, characterized in that: One end of the first self-excited oscillation cavity (2b) close to the water jet input section (1) is a first inlet, one end of the second self-excited oscillation cavity (2d) close to the fluid pipeline (2c) is a second inlet, and the other end is a second outlet. The diameter ratio of the first inlet to the second inlet, the diameter ratio of the second inlet to the second outlet, and the diameter ratio of the first inlet to the second outlet are all 1.2-1.

4. The length ratio of the first inlet to the second inlet, the length ratio of the second inlet to the second outlet, and the length ratio of the first inlet to the second outlet are all 1.6-1.

8.

8. The dual self-excited oscillation pulsed porous water jet nozzle according to claim 3, characterized in that: The cavity diameter ratio between the first self-excited oscillation cavity (2b) and the second self-excited oscillation cavity (2d) is 0.3-0.

4.

9. The dual self-excited oscillation pulsed porous water jet nozzle according to claim 3, characterized in that: The collision angles of the first self-excited oscillation cavity (2b) and the second self-excited oscillation cavity (2d) are both 50°-70°.

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