CN114307899A - Rotational flow pulse cavitation device - Google Patents

Abstract

The invention relates to a swirl pulse cavitation device, which comprises a spiral guide section, a hollow spiral guide section, an air intake cavity, a self-vibration cavitation cavity and a diffusion tube. The angle of the swirl blades of the spiral guide section and the hollow spiral guide section is 30° to 50°, and the spiral guide section is located below the hollow spiral guide section; the hollow spiral guide section has a hollow channel in the axis, The upper part of the hollow spiral guide section is connected with the air inlet cavity; the wall surface of the air inlet cavity is provided with air inlet holes; the upper part of the air inlet cavity is connected with the self-vibration cavitation cavity; the cavity wall of the self-vibration cavitation cavity has a tangential direction The suction port is provided with a guide plate at the tangential suction port; the tangential included angle of the guide plate is 10°-20°; the lower end of the diffuser pipe is connected with the upper end of the self-vibration cavitation cavity. The invention has simple structure and high efficiency, and can form a strong helical flow from conventional fluids. The strong helical fluid can separate gas and liquid under the action of centrifugal force, and the phase-separated flow is beneficial to improve the flow speed and more effectively promote the cavitation in the self-vibrating cavitation cavity. The formation of bubbles, and the formed cavitation bubbles are accelerated to eject, thereby further improving the cavitation efficiency.

Description

A swirl pulse cavitation device

technical field

The invention belongs to the technical field of hydraulic cavitation, and in particular relates to a swirling flow pulse cavitation device, which is suitable for oilfield drilling and exploitation.

Background technique

The hydrodynamic cavitation effect means that the liquid is affected by the movement of gas molecules. After the gas impacts into the liquid, there will be a group of suspended gas-phase microbubbles called "gas nuclei" in the liquid. When the pressure in the liquid drops below the air separation pressure, the gas nuclei dissolved in the liquid are rapidly separated from it to generate a large number of air bubbles. When these gases enter the high pressure area with the liquid flow, along with the collapse of the bubbles, the fluid particles move at high speed to the center of the cavity and produce a strong impact, resulting in a sharp rise in the instantaneous local pressure, which is called the cavitation effect. Since the discovery of this phenomenon, the industrial field is basically plagued by the negative effects of cavitation effect, so people have been looking for how to use this effect positively, and use the energy brought by the cavitation effect to move to the industrial field. Nowadays, cavitation effect has been widely used in various industries, such as petrochemical, shale mining, industrial cleaning and other fields, and there are various cavitation generating devices.

With the deepening of research on cavitation technology, the fields of application are becoming more and more extensive, and the structure of cavitation devices is various. However, how to use a simple structure to improve the cavitation effect, as well as increase the cavitation energy and the generation of cavitation bubbles has always been a problem. focus of research.

SUMMARY OF THE INVENTION

Aiming at the above shortcomings of the prior art, the present invention provides a swirl pulse cavitation device with simple structure, high efficiency, and improved cavitation bubble generation and cavitation efficiency.

The technical scheme of the present invention is as follows:

A swirl pulse cavitation device comprises a spiral guide section, a hollow spiral guide section, an air intake cavity, a self-vibration cavitation cavity, and a diffusion tube. The angle of the swirl blades of the spiral guide section and the hollow spiral guide section is 30° to 50°, and the spiral guide section is located below the hollow spiral guide section; the hollow spiral guide section has a hollow channel in the axis, The upper part of the hollow spiral guide section is connected with the air intake cavity; the wall surface of the air intake cavity is provided with air intake holes, and the upper part of the air intake cavity is connected with the self-vibration cavitation cavity; the cavity wall surface of the self-vibration cavitation cavity has a tangential direction The suction port is provided with a baffle plate; the tangential angle of the baffle plate is 10°-20°; the lower end of the diffusion pipe is connected with the upper end of the cavitation cavity.

The action mechanism of the swirl pulse cavitation generating device is as follows:

S1: After the fluid enters the spiral guide section under a certain pressure, a spiral flow is formed under the action of the 40° swirl blades, and the spiral flow is subjected to the centrifugal force during the ascending process, and the gas-liquid separation is performed for the first time;

S2: After the spiral fluid produces gas-liquid separation, the liquid phase moves along the wall of the wellbore, and the gas phase moves along the center of the wellbore. The gas-phase fluid rising along the center of the wellbore passes through the hollow channel and the air inlet cavity of the hollow spiral diversion section and enters the natural vibration in the cavity;

S3: The liquid phase rising along the wellbore wall passes through the 40° swirl vanes of the hollow spiral guide section for gas-liquid separation again, the liquid phase continues to rise along the wellbore wall, and the gas phase enters the self-vibrating cavitation cavity through the air inlet cavity ;

S4: The high-speed updraft enters the self-vibrating cavitation cavity to form a high-speed shear airflow. There is a tangential suction port on the wall of the self-vibrating cavitation cavity. After the high-speed airflow passes through the self-vibrating cavitation cavity, a negative pressure is generated in the cavity. Inhaled into the self-vibrating cavitation chamber, the tangentially rotating liquid phase produces a cavitation effect in the chamber under the action of high-speed shearing airflow, which makes it easier to generate more cavitation bubbles. A pulsed jet is formed, and the generated cavitation bubbles are accelerated and ejected through the diffuser tube to further increase the fluid velocity, thereby improving the cavitation effect.

Compared with the prior art, the present invention has the following advantages:

1. Through the structural design of the double helical section, the conventional fluid forms a strong helical flow, and the strong helical fluid produces gas-liquid separation under the action of centrifugal force. .

2. The cavity wall of the self-vibrating cavitation cavity is provided with a tangential suction port and a guide plate. After the high-speed airflow passes through the self-vibrating cavitation cavity, a negative pressure is generated in the cavity, and the liquid phase along the wall surface passes through the suction port and passes through the guide plate. After the plate is sucked into the self-vibrating cavitation chamber, the tangentially moving liquid phase fluid is more likely to generate a large number of cavitation bubbles in the chamber under the shearing action of the high-speed airflow.

3. The self-oscillating cavitation cavity turns the continuous jet into a pulsed jet, which further improves the cavitation speed and the generation of cavitation bubbles. The external suction type self-vibration cavitation cavity is conducive to the formation of cavitation bubbles and improves the cavitation efficiency, thereby further improving the cavitation efficiency.

4. The present invention has simple structure, low cost, and is applicable to a wider range of drilling and production.

Description of drawings

1 is a schematic view of a half-section structure of a swirl pulse cavitation device of the present invention;

Fig. 2 is the structural representation of the self-vibration cavitation cavity of the present invention;

Fig. 3 is A-A cross-sectional schematic diagram in Fig. 2;

Among them, 1. helical guide section; 2. hollow helical guide section; 3. air inlet cavity; 4. self-vibration cavitation cavity; 401 guide plate; 5. diffuser tube.

Detailed ways

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to this embodiment.

As shown in Figure 1, Figure 2, Figure 3, a swirl pulse cavitation device of the present invention, the mechanism of action of the present invention is:

1: After the fluid enters the spiral guide section 1 under a certain pressure, a spiral flow is formed under the action of the 40° swirl blades, and the spiral flow acts on the centrifugal force during the ascending process, and the gas-liquid separation is performed for the first time; 2: Spiral After the fluid produces gas-liquid separation, the liquid phase moves along the wall of the wellbore, and the gas phase moves along the center of the wellbore. The gas-phase fluid rising along the center of the wellbore passes through the hollow channel of the hollow spiral diversion section 2 and the air inlet cavity 3 and then enters the self-vibrating air cavity. 3: The liquid phase rising along the wellbore wall passes through the 40° swirl vanes of the hollow helical diversion section 2 for gas-liquid separation again, the liquid phase continues to rise along the wellbore wall, and the gas phase enters through the air inlet cavity 3 into the self-vibration cavitation cavity 4; 4: the high-speed ascending airflow enters the self-vibration cavitation cavity 4 to form a high-speed shear airflow. The cavity wall of the self-vibrating cavitation cavity 4 is provided with a tangential suction port. After the high-speed airflow passes through the self-vibrating cavitation cavity 4, a negative pressure is generated in the cavity. Under the action of 401, it is tangentially inhaled into the self-vibrating cavitation chamber 4, and the tangentially rotating liquid phase fluid produces a cavitation effect in the chamber under the action of high-speed shearing airflow, which is more likely to generate more cavitation bubbles and self-vibration. The cavitation chamber 4 can turn the continuous jet into a pulse jet, and then accelerate the ejection of the generated cavitation bubbles through the diffusion pipe 5, further increasing the fluid velocity, thereby improving the cavitation effect.

Claims (1)

1. A swirl pulse cavitation device, characterized in that the tool is mainly composed of a spiral guide section (1), a hollow spiral guide section (2), an air intake cavity (3), and a self-vibration cavitation cavity (4). ) and a diffuser (5), the angle of the swirl blades of the spiral guide section (1) and the hollow spiral guide section (2) is 30° to 50°, and the spiral guide section (1) is located in the hollow spiral guide section (2). Below the flow section (2); the hollow spiral guide section (2) is provided with a hollow channel in the axis, and the upper part of the hollow spiral guide section (2) is connected with the air intake cavity (3); the air intake cavity (3) The wall is provided with an air inlet hole, and the upper part of the air inlet cavity (3) is connected with the self-vibration cavitation cavity (4); the cavity wall of the self-vibration cavitation cavity (4) is provided with a tangential suction port, and the tangential suction port is located A deflector (401) is provided; the tangential angle of the deflector (401) is 10°-20°; the lower end of the diffusion pipe (5) is connected with the upper end of the self-vibrating cavitation cavity (4).

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