Annular Self-Excited Oscillation Gas Lift Device

Abstract

The present invention discloses an annular self-excited oscillation air-lift device, which comprises an air inlet seat with an air inlet passage penetrating therethrough; a material suction pipe; an oscillation seat with an oscillation chamber provided therein; and an ejection seat with an ejection hole penetrating therethrough. The material suction pipe is inserted into the air inlet passage, and an annular air inlet cavity is formed between the outer wall of the material suction pipe and the inner wall of the air inlet passage. An air inlet nozzle communicating with the annular air inlet cavity is provided on the air inlet seat. The air inlet seat is connected to the oscillation seat, the outlet end of the air inlet passage communicates with the oscillation chamber, the oscillation seat is connected to the ejection seat, and the oscillation chamber communicates with the ejection hole. The air inlet passage comprises an air inlet hole and a nozzle hole which are connected to each other on the same center line. The nozzle hole is frustum-shaped, the large end of the nozzle hole communicates with the air inlet hole, and the small end communicates with the oscillation chamber. The remarkable effect of adopting the present invention is that the conveying efficiency is improved.

Description

Technical Field

[0001] The present invention relates to a material conveying device, and more particularly to a conveying device for a solid-liquid mixture. Background Art

[0002] There are various ways to clean silt. In addition to manual operation, various dredging equipment / devices can be used. Existing dredging equipment / devices mostly use electric drive or fuel drive to directly provide power to drive the digging bucket or screw to transfer the silt outwards, with relatively high energy consumption and noise. Later, some people used air-lift devices for dredging. Since the air-lift device relies on the mutual impact between fluid particles to transfer energy, a large number of vortices are generated during the mixing process of multiphase flow (solid, liquid, gas). The high-pressure air flow of the existing air-lift device shoots in from the center, and the solid-liquid mixture is first radially sucked into the air-lift device and then axially advances along the high-pressure air flow; this causes the streamline of the solid-liquid mixture to change, resulting in energy consumption due to impact inside the air-lift device, low mud suction efficiency, and poor dredging effect. A solution to this problem can be to increase the pressure to increase the flow rate of the high-pressure air flow, but this will increase the energy consumption. In addition, the structure of the existing air-lift device is not perfect, resulting in unnecessary friction and collision in the flow channel, leading to energy loss and further reducing the efficiency of the air-lift device. Summary of the Invention

[0003] For the above reasons, in the structural design of the present invention, high-pressure gas is injected from an annular nozzle, while the solid-liquid mixture is directly axially sucked and flows, reducing the energy loss of the solid-liquid mixture. The air-lift structure is redesigned to improve the energy and momentum exchange speed of the working fluid and the sucked fluid at the nozzle outlet; improving its mass transfer, energy transfer, etc. efficiency. The purpose of energy conservation, emission reduction, and cost reduction is achieved. The main technical solutions adopted by the present invention are as follows:

[0004] The present invention provides an annular self-excited oscillation air-lift device, and the key lies in:

[0005] Including an air inlet seat, an air inlet passage is penetrated inside it;

[0006] A material suction pipe;

[0007] An oscillation seat, an oscillation chamber is provided inside it;

[0008] An ejection seat, an ejection hole is penetrated inside it;

[0009] The material suction pipe is inserted into the air inlet passage, and an annular end cover is fixedly sleeved outside the material suction pipe. The annular end cover is located at the inlet end of the air inlet passage, and the outer edge of the annular end cover abuts against the inner wall of the air inlet passage. An annular air inlet cavity is formed between the outer wall of the material suction pipe and the inner wall of the air inlet passage. An air inlet nozzle communicating with the annular air inlet cavity is provided on the air inlet seat;

[0010] The inlet end of the material suction pipe extends outward from the inlet of the air inlet passage, and the outlet end of the material suction pipe is located within the air inlet passage;

[0011] The air inlet seat is connected to the oscillation seat, and the outlet end of the air inlet passage communicates with the oscillation chamber;

[0012] The oscillation seat is connected to the injection seat, and the oscillation chamber communicates with the injection hole;

[0013] The air inlet passage includes an air inlet hole and a nozzle hole that are connected to each other on the same center line. The nozzle hole is frustum-shaped. The large end of the nozzle hole is connected to the air inlet hole, the small end of the nozzle hole communicates with the oscillation chamber, and the outlet end of the material suction pipe is located within the nozzle hole;

[0014] A ring-shaped wedge surface is provided on the outer wall of the outlet end of the material suction pipe. The wedge surface is parallel to the inner wall of the nozzle hole, and an annular nozzle is formed between the wedge surface and the inner wall of the nozzle hole. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of the present invention;

[0016] Figure 2 is Figure 1 the enlarged view of part k of

[0017] Figure 3 is Figure 1 the enlarged view of part j of

[0018] Figure 4 is a schematic diagram of the flow direction of the solid-liquid mixture under the action of high-pressure gas;

[0019] Figure 5 is a schematic diagram of the disturbance state of the solid, liquid, and gas three-phase mixture in the oscillation chamber 3a;

[0020] Figure 6 is the pressure nephogram of the internal fluid of the air inlet passage 1a and the oscillation chamber 3a during simulation;

[0021] Figure 7 is the velocity nephogram at the position of the annular nozzle during simulation

[0022] Figure 8 is the velocity nephogram in the oscillation chamber 3a during simulation Detailed Embodiment

[0023] The present invention will be further described below in conjunction with embodiments and the drawings.

[0024] As Figure 1 、 2As shown in FIG. 3 , a ring-shaped self-excited oscillation gas lift device comprises an inlet seat 1, in which an inlet passage 1a is penetrated; a suction pipe 2; an oscillation seat 3, in which an oscillation chamber 3a is provided; and an ejection seat 4, in which an ejection hole 4a is penetrated;

[0025] The suction pipe 2 is inserted into the air inlet 1a, and an annular end cover 21 is fixedly sleeved outside the suction pipe 2. The annular end cover 21 is integrally formed with the suction pipe 2, and the annular end cover 21 is located at the inlet end of the air inlet 1a. The outer edge of the annular end cover 21 is tightly pressed against and sealed against the inner wall of the air inlet 1a, and an annular air inlet cavity is formed between the outer wall of the suction pipe 2 and the inner wall of the air inlet 1a. An air inlet nozzle 11 connected with the annular air inlet cavity is provided on the air inlet seat 1;

[0026] The inlet end of the suction pipe 2 extends outward from the inlet of the air inlet duct 1a, and the outlet end of the suction pipe 2 is located in the air inlet duct 1a;

[0027] The air inlet seat 1 is connected to the oscillation seat 3, the outlet end of the air inlet passage 1a is connected to the oscillation chamber 3a, the oscillation seat 3 is connected to the ejection seat 4, and the oscillation chamber 3a is connected to the ejection hole 4a;

[0028] The air inlet 1a comprises an air inlet hole, a transition hole and a nozzle hole which are connected in sequence with the same center line, the nozzle hole and the transition hole are both truncated cone-shaped, the small end of the nozzle hole is connected to the oscillation chamber 3a, the large end of the nozzle hole is connected to the small end of the transition hole, the large end of the transition hole is connected to the air inlet hole, the air inlet hole can be a circular hole, the taper of the transition hole is greater than the taper of the nozzle hole, and the outlet end of the suction pipe 2 is located in the nozzle hole;

[0029] The outer wall of the outlet end of the suction pipe 2 is provided with a ring-shaped wedge surface, and the wedge surface is parallel to the inner wall of the nozzle hole. An annular nozzle is formed between the wedge surface and the inner wall of the nozzle hole. Constrained by the wedge surface and the inner wall of the nozzle hole, the annular nozzle also presents a shape with one end larger and the other end smaller.

[0030] An annular front end plate 22 is also fixedly sleeved outside the material suction pipe 2. The annular front end plate 22 can be welded to the material suction pipe 2. The annular front end plate 22 bulges radially outwards and extends beyond the outer contour of the air inlet seat 1. The inner end face of the annular front end plate 22 is in close contact with the outer end face of the annular end cover 21. A first extended washer 23 is also movably sleeved on the outer wall of the annular end cover 21. The inner end face of the first extended washer 23 abuts against and seals the air inlet seat 1. The outer end face of the first extended washer 23 abuts against and seals the inner end face of the annular front end plate 22. By adjusting the axial dimension of the first extended washer 23, the axial distance between the air inlet seat 1 and the annular front end plate 22 can be changed, so as to adjust the axial position of the material suction pipe 2 and finally adjust the opening degree of the annular nozzle, so that the user can independently match the opening degree of the annular nozzle according to factors such as gas pressure, the state and concentration of the solid-liquid mixture, etc.

[0031] The oscillation seat 3 includes an outer cylinder 31 and an end seat 32. The end seat 32 is arranged opposite to the air inlet seat 1. The two ends of the outer cylinder 31 are respectively sleeved on the end seat 32 and the air inlet seat 1. The space constrained by the end seat 32, the outer cylinder 31 and the air inlet seat 1 forms the oscillation chamber 3a.

[0032] The inlet end of the outer cylinder 31 is movably sleeved on the air inlet seat 1. A sealing ring is arranged between the air inlet seat 1 and the inlet end of the outer cylinder 31. An abutting ring 12 is fixedly sleeved outside the air inlet seat 1, and the abutting ring 12 is close to the outlet end of the air inlet passage 1a;

[0033] A second extended washer 13 is also movably sleeved outside the air inlet seat 1. The second extended washer 13 is located in the downstream direction of the abutting ring 12. The second extended washer 13 abuts against and seals the abutting ring 12. The end face of the inlet end of the outer cylinder 31 abuts against and seals the second extended washer 13. The outlet end of the outer cylinder 31 is fixedly sleeved on the end seat 32. The function of the second extended washer 13 is similar to that of the first extended washer 23. It axially adjusts the size of the oscillation chamber 3a by changing the axial distance between the outer cylinder 31 and the abutting ring 12.

[0034] An annular rear end plate 33 is fixedly sleeved outside the end seat 32. A plurality of parallel connecting rods 5 are stretched between the annular front end plate 22 and the annular rear end plate 33. In a conventional manner, at least three connecting rods 5 are provided, and all the connecting rods 5 are arranged around the air inlet seat 1 and the oscillation seat 3. The two ends of the connecting rod 5 respectively pass through the annular front end plate 22 and the annular rear end plate 33, and nuts are respectively sleeved on the two passing-through ends of the connecting rod 5 to tightly pull the annular front end plate 22 and the annular rear end plate 33 inward through the connecting rod 5, so that: the inner end surface of the first extended washer 23 abuts against and seals the air inlet seat 1, the outer end surface of the first extended washer 23 abuts against the inner end surface of the annular front end plate 22, the second extended washer 13 abuts against the abutting ring 12, and the end surface of the inlet end of the outer cylinder 31 abuts against the second extended washer 13.

[0035] The side surface of the air inlet seat 1 facing the oscillation chamber 3a is a plane; the side surface of the end seat 32 facing the oscillation chamber 3a is provided with a frustum-shaped oscillation convex block. The large end surface of the oscillation convex block is connected to the end seat 32, and the edge of the large end surface of the oscillation convex block fits against the inner wall of the outer cylinder 31;

[0036] A same flow-through round hole penetrates through the end seat 32 and the oscillation convex block. The ejection hole 4a includes a flat-connected round hole, a flow-expanding hole, and an outflow round hole that are sequentially communicated along the common center line. The aperture of the flat-connected round hole is equal to the aperture of the flow-through round hole. The flat-connected round hole is communicated with the flow-through round hole. The flow-expanding hole is frustum-shaped. The small end of the flow-expanding hole is communicated with the flat-connected round hole, and the large end of the flow-expanding hole is communicated with the outflow round hole.

[0037] The taper of the transition hole is 0.8 - 1.2; the taper of the nozzle hole is 0.2 - 0.3; the taper of the oscillation convex block is 4 - 4.5; the taper of the flow-expanding hole is 0.4 - 0.5.

[0038] High-pressure air flow is introduced into the air lift in the above embodiments, and the inlet end of the suction pipe 2 is inserted into the sludge for suction. The solid-liquid mixture (sludge) enters the oscillation chamber 3a under the drive of the high-pressure air flow and is ejected from the ejection hole 4a; the flow direction of the solid-liquid mixture (sludge) under the drive of the high-pressure air flow is as Figure 4 shown, and the disturbance state of the three-phase mixed flow of solid, liquid, and gas in the oscillation chamber 3a is as Figure 5 shown.

[0039] The above suction process is simulated, and the pressure nephogram of the fluid in the entire flow channel (including the annular nozzle, the air inlet channel 1a, the oscillation chamber 3a, and the ejection hole 4a) is obtained, as Figure 6 shown. The velocity nephogram at the position of the annular nozzle is shown in Figure 7 , and the velocity nephogram in the oscillation chamber 3a is shown in Figure 8 .

[0040] From Figure 6 and 7 As can be seen from 8, the solid-liquid mixture in the suction pipe 2 is affected by the high-pressure (high-speed) air flow, and its flow rate and pressure are significantly increased after entering the nozzle hole, which will significantly improve the suction effect on the solid-liquid mixture.

[0041] Beneficial effects: The air-lift device adopting the technical solution of the present invention can generate pulsed jets, so that the working gas and the sucked solid-liquid mixture can exchange momentum and energy faster, reduce energy loss, improve the working efficiency of the air-lift device and its performance such as energy transfer, mass transfer, and entrainment, and can adjust the aspect ratio of the oscillation chamber and the equivalent diameter of the annular nozzle according to the working conditions, with a wider application range.

[0042] Finally, it should be noted that the above description is only the preferred embodiment of the present invention. Under the inspiration of the present invention, those of ordinary skill in the art can make various similar representations without departing from the purpose and claims of the present invention, and such transformations all fall within the protection scope of the present invention.

Claims

1. A ring-shaped self-excited oscillation air lift device, characterized in that: It includes an air inlet seat (1) with an air inlet channel (1a) penetrating through its interior; A material suction pipe (2); An oscillation seat (3) with an oscillation chamber (3a) provided inside; An ejection seat (4) with an ejection hole (4a) penetrating through its interior; The material suction pipe (2) is inserted into the air inlet channel (1a), and an annular end cover (21) is fixedly sleeved outside the material suction pipe (2). The annular end cover (21) is located at the inlet end of the air inlet channel (1a), and the outer edge of the outer ring of the annular end cover (21) abuts against the inner wall of the air inlet channel (1a). An annular air inlet cavity is formed between the outer wall of the material suction pipe (2) and the inner wall of the air inlet channel (1a). An air inlet nozzle (11) communicating with the annular air inlet cavity is provided on the air inlet seat (1); The inlet end of the material suction pipe (2) extends outwards from the inlet of the air inlet channel (1a), and the outlet end of the material suction pipe (2) is located inside the air inlet channel (1a); The air inlet seat (1) is connected to the oscillation seat (3), and the outlet end of the air inlet channel (1a) is communicated with the oscillation chamber (3a); The oscillation seat (3) is connected to the ejection seat (4), and the oscillation chamber (3a) is communicated with the ejection hole (4a); The air inlet channel (1a) includes an air inlet hole and a nozzle hole that are connected to each other on the same center line. The nozzle hole is frustum-shaped, the large end of the nozzle hole is communicated with the air inlet hole, the small end of the nozzle hole is communicated with the oscillation chamber (3a), and the outlet end of the material suction pipe (2) is located inside the nozzle hole; A ring-shaped wedge surface is provided on the outer wall of the outlet end of the material suction pipe (2). The wedge surface is parallel to the inner wall of the nozzle hole, and an annular nozzle is formed between the wedge surface and the inner wall of the nozzle hole; A transition hole is also provided on the same center line between the air inlet hole and the nozzle hole. The transition hole is frustum-shaped, the large end of the transition hole is communicated with the air inlet hole, the small end of the transition hole is communicated with the nozzle hole, and the taper of the transition hole is greater than the taper of the nozzle hole; An annular front end plate (22) is also fixedly sleeved outside the material suction pipe (2). The annular front end plate (22) bulges radially outwards and exceeds the outer contour of the air inlet seat (1). The inner end surface of the annular front end plate (22) is in close contact with the outer end surface of the annular end cover (21). A first extended washer (23) is also movably sleeved on the outer wall of the annular end cover (21). The inner end surface of the first extended washer (23) abuts against the air inlet seat (1), and the outer end surface of the first extended washer (23) abuts against the inner end surface of the annular front end plate (22); The oscillation seat (3) includes an outer cylinder (31) and an end seat (32). The end seat (32) is arranged opposite to the air inlet seat (1). The two ends of the outer cylinder (31) are respectively sleeved on the end seat (32) and the air inlet seat (1). The space constrained by the end seat (32), the outer cylinder (31) and the air inlet seat (1) forms the oscillation chamber (3a); The inlet end of the outer cylinder (31) is movably sleeved on the air inlet seat (1). An abutting ring (12) is fixedly sleeved outside the air inlet seat (1), and the abutting ring (12) is close to the outlet end of the air inlet passage (1a). A second extension washer (13) is also movably sleeved outside the air inlet seat (1), and the second extension washer (13) is located in the downstream direction of the abutting ring (12). The second extension washer (13) abuts tightly against the abutting ring (12), and the end face of the inlet end of the outer cylinder (31) abuts tightly against the second extension washer (13). The outlet end of the outer cylinder (31) is fixedly sleeved on the end seat (32). An annular rear end plate (33) is fixedly sleeved outside the end seat (32), and a plurality of connecting rods (5) are stretched between the annular front end plate (22) and the annular rear end plate (33). The taper of the transition hole is 0.8 - 1.

2. The taper of the nozzle hole is 0.2 - 0.

3. The side surface of the air inlet seat (1) facing the oscillation chamber (3a) is a plane. The side surface of the end seat (32) facing the oscillation chamber (3a) is provided with a frustum-shaped oscillation bump. The large end face of the oscillation bump is connected to the end seat (32), and the edge of the large end face of the oscillation bump fits against the inner wall of the outer cylinder (31). The taper of the oscillation bump is 4 - 4.

5. A through-flow round hole penetrates through the end seat (32) and the oscillation bump. The injection hole (4a) includes a flat-connected round hole, a flow-expanding hole, and an outflow round hole that are sequentially connected in a common center line. The aperture of the flat-connected round hole is equal to the aperture of the through-flow round hole. The flat-connected round hole is connected to the through-flow round hole. The flow-expanding hole is frustum-shaped. The small end of the flow-expanding hole is connected to the flat-connected round hole, and the large end of the flow-expanding hole is connected to the outflow round hole. The taper of the flow-expanding hole is 0.4 - 0.5.

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