Underwater cavitation jet cleaning nozzle and cleaning disc

Abstract

The utility model discloses an underwater cavitation jet cleaning nozzle and a cleaning disc, and belongs to the technical field of underwater cleaning operation, the underwater cavitation jet cleaning nozzle comprises a connecting hole, an acceleration hole, a first cavitation generation section and a second cavitation generation section, the aperture of the acceleration hole is smaller than that of the connecting hole, and the aperture of the second cavitation generation section is smaller than that of the connecting hole. The first cavitation generation section comprises a small taper hole of 20-25 degrees and an annular groove formed in the small taper hole, the small end of the small taper hole is connected with the acceleration hole, the second cavitation generation section is a large taper hole of 75-85 degrees, cleaning water is accelerated through the acceleration hole, cavitation bubbles are efficiently generated through the small taper hole of the first cavitation generation section and the annular groove structure, and the cavitation generation efficiency is improved. And cavitation bubbles are further increased through a large taper hole of the second cavitation generation section, cleaning water containing a large number of cavitation bubbles is jetted out of the spray heads at a high speed, efficient cavitation jet cleaning is achieved, and the underwater cavitation cleaning disc generates rotating torque through more than two underwater cavitation cleaning spray heads eccentrically installed on the connecting base, so that the rotary cleaning function is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of underwater cleaning operations, and in particular relates to an underwater cavitation jet cleaning nozzle. Background Art

[0002] After a period of time, marine organisms such as barnacles will attach to equipment and components in the sea, grow and reproduce, and affect the function of the equipment and components. This is especially true for ships. Marine organisms attached to the bottom of the ship slow down the speed, increase fuel consumption, and easily cause marine organism invasion. They need to be cleaned regularly. In addition, equipment components in rivers, lakes, and reservoirs also need to be cleaned during maintenance. Defects can only be discovered after cleaning.

[0003] Existing high-pressure jet cleaning nozzles are not suitable for underwater cleaning operations because there is water between the nozzle and the object to be cleaned, which offsets most of the impact force of the high-pressure jet. Using a brush for cleaning is less efficient and can easily cause damage to the device, especially damage to the paint, leading to rust on equipment and components.

[0004] Cavitation jet cleaning refers to the process of water jets generating cavitation bubbles through cavitation. When the jet containing a large number of cavitation bubbles contacts the object to be cleaned, the pressure on the contact surface increases, and the cavitation bubbles collapse to produce a high-pressure impact, which removes dirt on the surface of the object, just like ultrasonic cleaning. The amount of bubbles generated by the cavitation nozzle determines the effect of cavitation cleaning. Existing cavitation cleaning nozzles generally have a trumpet-shaped outlet after the acceleration hole to achieve high-speed water jets. Due to the fluidity of the liquid, the low-pressure area of ​​the jet is mainly concentrated in the boundary layer with the bell-mouth wall. The jet vaporizes into cavitation bubbles in the boundary layer, and the number is relatively limited. In order to increase the cavitation bubbles, the pressure at the inlet of the throttle hole needs to be increased to a very high level and the flow rate needs to be large. A high-pressure and large-flow water pump must be equipped, which consumes a lot of energy and has high requirements for the water delivery hose. Summary of the invention

[0005] In order to improve the cavitation efficiency, the utility model provides an underwater cavitation jet cleaning nozzle with higher cavitation efficiency.

[0006] The utility model discloses an underwater cavitation jet cleaning nozzle, comprising a connecting hole, an accelerating hole, a first cavitation generating section and a second cavitation generating section, wherein the connecting hole is connected to the accelerating hole, the aperture of the accelerating hole is smaller than that of the connecting hole, the first cavitation generating section comprises a small tapered hole with an angle of 20° to 25° and an annular groove provided on the small tapered hole, the small end of the small tapered hole is connected to the accelerating hole, the second cavitation generating section is a large tapered hole with an angle of 75° to 85°, the small end of the large tapered hole is connected to the large end of the small tapered hole.

[0007] Furthermore, the diameter of the acceleration hole is between 1.5 mm and 2 mm.

[0008] Furthermore, the diameter of the acceleration hole is smaller than 1 / 5 of the connection hole.

[0009] Furthermore, the aspect ratio of the acceleration hole is 4 to 6, which achieves a better pressurization effect compared with a thin-walled small hole.

[0010] The working principle of the utility model is as follows: the function of the acceleration hole is to maintain the water pressure at the inlet end to reach the cleaning requirement of 15Mpa or more by throttling, and secondly, the cleaning water flows from the connecting hole to the acceleration hole, the cross-sectional area decreases and the flow rate increases, the cross-sectional area of ​​the small cone hole of 20° to 25° in the first cavitation occurrence section gradually increases, and the high-pressure and high-speed water flow coming out of the acceleration hole forms a small-angle high-speed jet in this section. When the high-speed jet passes through the annular groove, according to the Bernoulli principle, the boundary layer and the annular groove form a low-pressure area, and the pressure is lower than the saturated vapor pressure of water. The cleaning water vaporizes into cavitation in this area and is sucked into the jet. The gradual increase in the cross-sectional area is conducive to Accommodate the cavitation generated by vaporization to avoid pressure increase due to the increase of cavitation, which in turn will cause the cavitation to collapse; the second cavitation occurrence section is a large cone hole with an angle of 75° to 85°. Under the action of velocity inertia, the cross-sectional area increases, and the jet not only continues to vaporize into cavitation in the boundary layer of the large cone hole wall, but also causes low pressure in the jet due to the increase in the cross-sectional area of ​​the large cone hole. The outer wall of the cavitation generated in the first cavitation section continues to generate cavitation and continues to expand. The cavitation in the jet increases exponentially. When the jet collides with the cleaning surface, the pressure increases and the cavitation collapses. Due to the incompressibility of water, a high-pressure impact is generated when the cavitation collapses, which removes dirt and realizes the cavitation cleaning function.

[0011] When in use, the cavitation jet cleaning nozzle is connected to a cleaning water flow above 15Mpa, generally 15MPa~20Mpa is appropriate. A high-pressure pump is used to pressurize the nozzle to reach the required pressure. The cavitation jet cleaning nozzle should be 20mm~60mm away from the cleaning surface, and cavitation jet cleaning is performed on the cleaning object.

[0012] The utility model also discloses an underwater cavitation jet cleaning disc, comprising a disc cover, a rotating joint installed at the center of the disc cover, a connecting seat installed at the lower end of the rotating joint, and more than two underwater cavitation jet cleaning nozzles eccentrically and tilted downwardly installed on the connecting seat.

[0013] Furthermore, the downward inclined angle is preferably 30°.

[0014] When in use, the underwater cavitation jet cleaning disc is directed toward the object to be cleaned, and more than two underwater cavitation jet cleaning nozzles installed on the eccentrically mounted connecting seat generate a reaction force during the cleaning process, which pushes the connecting seat installed on the rotating joint to rotate, thereby realizing the rotating cleaning function of the nozzle.

[0015] The utility model discloses an underwater cavitation jet cleaning nozzle and a cleaning disc. The underwater cavitation jet cleaning nozzle comprises a connecting hole, an accelerating hole, a first cavitation generating section and a second cavitation generating section. The aperture of the accelerating hole is smaller than that of the connecting hole. The first cavitation generating section comprises a small conical hole with an angle of 20° to 25° and an annular groove provided on the small conical hole. The small end of the small conical hole is connected to the accelerating hole. The second cavitation generating section is a large conical hole with an angle of 75° to 85°. Cleaning water is accelerated by passing through the accelerating hole. Cavitation is efficiently generated by the small conical hole and the annular groove structure of the first cavitation generating section. Cavitation is further increased by the large conical hole of the second cavitation generating section. Cleaning water containing a large amount of cavitation is ejected from the nozzle at a high speed to realize efficient cavitation jet cleaning. The underwater cavitation cleaning disc generates a rotational torque through two or more underwater cavitation cleaning nozzles eccentrically mounted on a connecting seat to realize a rotational cleaning function. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model will be further described below in conjunction with the accompanying drawings.

[0017] Figure 1 The utility model is a structural diagram of an underwater cavitation jet cleaning nozzle embodiment.

[0018] Figure 2 yes Figure 1 Magnified view of area A.

[0019] Figure 3 It is a structural diagram of an underwater cavitation jet cleaning embodiment of the utility model.

[0020] Figure 4 yes Figure 3 Bottom view of .

[0021] Figure numerals: 1. connecting hole; 2. accelerating hole; 3. annular groove; 4. small conical hole; 5. second cavitation generating section; 11. disk cover; 12. rotating joint; 13. connecting seat; 14. underwater cavitation jet cleaning nozzle A; 15. underwater cavitation jet cleaning nozzle B. Implementation

[0022] Figure 1 to Figure 2 An embodiment of the utility model is shown, which comprises a connecting hole 1, an accelerating hole 2, a first cavitation generating section, and a second cavitation generating section 5. The connecting hole 1 is connected to the accelerating hole 2. The aperture of the accelerating hole 2 is 1.8 mm. The aspect ratio of the accelerating hole 2 is 5. The aperture of the accelerating hole 2 is 1 / 6 of that of the connecting hole. The first cavitation generating section comprises a small tapered hole 4 with an angle of 20° to 25° and an annular groove 3 provided on the small tapered hole 4. The small end of the small tapered hole 4 is connected to the accelerating hole 2. The second cavitation generating section 5 is a large tapered hole with an angle of 75° to 85°. The small end of the large tapered hole is connected to the large end of the small tapered hole 4.

[0023] Figure 3 to Figure 4 The utility model shows an underwater cavitation jet cleaning disc, comprising a disc cover 11, a rotating joint 12 installed at the center of the disc cover 11, a connecting seat 13 installed at the lower end of the rotating joint 12, and an underwater cavitation jet cleaning nozzle A14 and an underwater cavitation jet cleaning nozzle B15 installed eccentrically and tilted downward on the connecting seat 13. The underwater cavitation jet cleaning nozzle A14 and the underwater cavitation jet cleaning nozzle B15 are the underwater cavitation jet cleaning nozzles in the above-mentioned embodiments.

Claims

1. An underwater cavitation jet cleaning nozzle, characterized in that: It includes a connecting hole, an accelerating hole, a first cavitation generating section, and a second cavitation generating section. The connecting hole is connected to the accelerating hole, and the aperture of the accelerating hole is smaller than that of the connecting hole. The first cavitation generating section includes a small tapered hole with an angle of 20° to 25° and an annular groove opened on the small tapered hole. The small end of the small tapered hole is connected to the accelerating hole. The second cavitation generating section is a large tapered hole with an angle of 75° to 85°, and the small end of the large tapered hole is connected to the large end of the small tapered hole.

2. The underwater cavitation jet cleaning nozzle according to claim 1, characterized in that: The diameter of the acceleration hole is between 1.5 mm and 2 mm.

3. The underwater cavitation jet cleaning nozzle according to claim 1 or 2, characterized in that: The diameter of the accelerating hole is smaller than 1 / 5 of the connecting hole.

4. The underwater cavitation jet cleaning nozzle according to claim 1 or 2, characterized in that: The aspect ratio of the accelerating hole is 4-6.

5. An underwater cavitation jet cleaning disc, characterized in that: It includes a disc cover, a rotating joint installed in the center of the disc cover, a connecting seat installed at the lower end of the rotating joint, and two or more underwater cavitation jet cleaning nozzles installed eccentrically and tilted downward on the connecting seat. The underwater cavitation jet cleaning nozzle is the underwater cavitation jet cleaning nozzle described in claim 1, 2, 3 or 4.

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