CN108654860B

CN108654860B - Submerged type multi-joint cavitation spray head

Info

Publication number: CN108654860B
Application number: CN201810714171.9A
Authority: CN
Inventors: 王治国; 狄立辉; 郑杰; 窦益华
Original assignee: Xian Shiyou University
Current assignee: Xian Shiyou University
Priority date: 2018-06-29
Filing date: 2018-06-29
Publication date: 2023-09-05
Anticipated expiration: 2038-06-29
Also published as: CN108654860A

Abstract

The submerged type multi-joint cavitation spray head comprises a water inlet, three water outlets and a cavitation spray nozzle connected to the three water outlets, wherein the cavitation spray nozzle comprises a spring piece spray nozzle, an oscillation cavity and a diversion cavity which are sequentially connected by threads; an oscillator is arranged in the oscillation cavity; the inner wall of the diversion cavity is provided with a diversion trench; when liquid enters the cavitation nozzle, irregular movement of the vibrator is caused, and the reed is also caused to vibrate, so that the fluctuation has a strong stripping effect on pollutants on the surface of a cleaned object; because of the high-density cavitation bubbles generated by the action of the pressure gradient, the strong microjet impact force generated by the collapse of the cavitation bubbles in the local micro-area on the surface of the object can clean hard dirt and attached marine organisms, so the development and application of the cavitation jet underwater cleaning technology have important significance for ships and even all facilities immersed in water for a long time, and solve the underwater engineering difficulty which has puzzled people for a long time.

Description

Submerged type multi-joint cavitation spray head

Technical Field

The invention relates to the technical field of fluid, in particular to a submerged multi-joint cavitation spray head based on cavitation as a principle.

Background

At present, as the ocean is developed to the ocean, the more and more ocean equipment is increased, a large amount of bacteria adhere to the surface of the material of the ocean equipment due to long-term soaking of ships, bridges, ocean platforms and the like in the marine biological environment with strong corrosiveness and strong adhesion, and a very thick adhesion layer and a very thick dirt layer are formed, so that the cleaning of the ocean equipment is a very huge project in view of the great influence of the attachments on the ship navigation speed and the equipment life.

Aiming at the analysis of cleaning technology and application at home and abroad. The existing cleaning modes comprise dock cleaning and underwater cleaning, including a scraping technique, a sand blasting technique, a rotating brushing technique, a sound field technique, a high-pressure and ultra-high-pressure water jet technique, an abrasive water jet technique and a submerged cavitation water jet technique; the scraping technique has low efficiency and long cleaning period, is not a main cleaning mode any more, and often appears as an auxiliary means. The sand blasting operation is simple, the equipment cost is low, but the environmental pollution is serious, and the health of workers is endangered. The rotating brush is suitable for cleaning soft organisms, and is difficult to remove shelf-shaped organisms. Abrasive water jet and sound field techniques still need further investigation due to the technical difficulties. High-pressure water jet cleaning is efficient, but safe operation requires specialized training, and secondary rust returning is serious. The ultra-high pressure complete cleaning equipment can well solve the rust returning problem and the recovery of waste water and waste residues. But these cleaning techniques generally damage the substrate coating of the ship.

Disclosure of Invention

In order to overcome the defects of the cleaning technology, the invention aims to provide a submerged multi-joint cavitation spray head, which utilizes cavitation bubbles to generate strong sound effects such as sound micro-flow, injection, shock waves and the like in liquid when pulsating and breaking, and peels off impurities on the surface of a sample so as to achieve the aim of cleaning.

In order to achieve the above purpose, the technical scheme of the invention is realized as follows:

the submerged type multi-joint cavitation spray head comprises a water inlet A, three water outlets B and a cavitation spray nozzle connected to the three water outlets B, wherein the cavitation spray nozzle comprises a spring piece spray nozzle 4, an oscillation cavity 1 and a diversion cavity 2 which are sequentially connected by threads; an oscillator 3 is arranged in the oscillation cavity 1; the inner wall of the diversion cavity 2 is provided with a diversion trench;

the spring piece spout 4 is loudspeaker-shaped made of flexible materials, the edge is of a sawtooth structure, and the center of the spout is provided with a vibration reed 5 to form a narrow slit.

The water inlet A and the three water outlets B form 120 degrees with each other so as to offset the axial and radial reaction force of the water inlet.

The inside of the oscillator 3 is hollow, and six holes are formed.

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

(1) And a vibration reed 5 is added to the cavitation spray head to enhance the resonance effect of cavitation waves.

(2) The submerged three-nozzle joint is adopted, so that the cleaning area is increased; and counteracts a portion of the axial and radial reaction forces; the erosion effect is improved in the submerged state.

(3) The cavitation jet cleaning with low pressure can ensure that paint anti-fouling and anti-corrosion coatings on the treated surface are not damaged while dirt is removed; the safety performance is high, the danger to the user can not be caused, and the safety of the operation personnel can be effectively ensured.

Drawings

Fig. 1 is a schematic diagram of the structural composition of the present invention.

FIG. 2 is a schematic view of the water inlet and outlet of the present invention.

FIG. 3 is a schematic view of the cavitation nozzle structure of the present invention.

Fig. 4 is a schematic view of a slit of the spring plate spout 4 of the present invention.

Fig. 5 is a cross-sectional view of the spring plate spout 4 of the present invention.

Detailed Description

The invention is further described with reference to the drawings and detailed description which follow:

referring to fig. 1, 2 and 3, a submerged multi-joint cavitation spray head comprises a water inlet A, three water outlets B and a cavitation nozzle connected to the three water outlets B, wherein the cavitation nozzle comprises a spring piece nozzle 4, an oscillation cavity 1 and a diversion cavity 2 which are sequentially connected by adopting threads; an oscillator 3 is arranged in the oscillation cavity 1; the inner wall of the diversion cavity 2 is provided with a diversion trench.

Referring to fig. 3, 4 and 5, the spring plate nozzle 4 is made of flexible material, has a horn-shaped edge with a saw-tooth structure, and is provided with a vibration reed 5 at the center thereof to form a narrow slit.

Referring to fig. 1 and 2, the water inlet A and the three water outlets B form 120 degrees with each other so as to offset the axial and radial reaction forces of the water inlet.

Referring to fig. 3, the vibrator 3 is hollow and has six holes, which has a throttling effect on the fluid, increases the flow rate of the fluid and reduces the pressure, cavitation bubbles are broken due to the pressure gradient, and when the liquid is sprayed out from the nozzle, a vibration reed 5 extending outwards is arranged in front of the strip-shaped nozzle, and the spring piece divides the nozzle into two parallel slits, referring to fig. 5

The working principle of the invention is as follows: when the high-pressure water pump is used for injecting high-pressure liquid, the high-pressure water pump passes through the water inlet A and enters the three nozzles from the three water outlets B, the water inlet and the three water outlets form 120 degrees with each other so as to offset the axial and radial reaction force of the water inlet, when the liquid enters the cavitation nozzle, as shown in figure 3, turbulence is formed under the flow guiding effect of the flow guiding groove through the flow guiding cavity 2, the vibration of the vibration oscillator 3 is caused, a large number of cavitation bubbles are generated in the vibration cavity 1, when the cavitation bubbles enter the spring piece nozzle 4, after the cavitation bubbles are sprayed out from the narrow slit nozzle, two vortex flows are generated on two sides of the axis of the jet flow due to the rapid flow speed and the fluid viscosity effect, the vortex flows are alternately emitted on two sides of the narrow slit, the rotation directions are opposite, the vortex rotation can cause the fluctuation of the transverse flow pressure of the jet flow, and meanwhile, the vibration of the reed can be caused, a strong edge sound can be generated, and a damage effect can be generated on the dirt layer of the ship body, so that the aim of cleaning is achieved. When the spray head works underwater, after the jet flow is sprayed out from the spray nozzle at a high speed, the jet flow and surrounding static liquid or low-speed circulation flow generate shearing action to form vortex cavitation water jet flow, and the damage effect of the surface of the target body can be enhanced.

The invention emphasizes the strong erosion effect of cavitation water jet at low pressure and the technical characteristics of no damage to the coating, and highlights the advantages and the necessity of underwater cleaning. Finally, summarizing the characteristics of ultra-high pressure high-power dock cleaning, the development trend of the ship body underwater cleaning complete equipment combining various technologies is provided mainly by using a submerged cavitation water jet technology, so that the ship body pollution cleaning with low energy consumption, no damage and environmental protection is realized.

Claims

1. The submerged type multi-joint cavitation spray head is characterized by comprising a water inlet (A), three water outlets (B) and a cavitation nozzle connected to the three water outlets (B), wherein the cavitation nozzle comprises a spring piece spray nozzle (4), an oscillation cavity (1) and a diversion cavity (2) which are sequentially connected by threads; an oscillator (3) is arranged in the oscillation cavity (1); the inner wall of the diversion cavity (2) is provided with a diversion trench; the spring piece nozzle (4) is in a horn shape made of flexible materials, the edge of the spring piece nozzle is in a sawtooth structure, and the vibration reed (5) is arranged in the center of the nozzle to form a narrow slit; the water inlet (A) and the three water outlets (B) form 120 degrees with each other; the inside of the oscillator (3) is hollow, and six holes are formed.