SU1736837A1 - Device for ultrasonic protection of shipboard systems against fouling - Google Patents

Abstract

This invention relates to shipbuilding. The purpose of the invention is to reduce the energy intensity and weight and size characteristics of the equipment used to protect the device. The device consists of two magnetostrictive transducers 1 and 2, which are arranged with radiating surfaces 3 and 4 on the channel walls facing one another. The height H between the radiating surfaces is chosen to be less than or equal to twice the height of the cavitation zone from the radiator zone. Perpendicularly radiating surfaces 3 and 4, equal-sized partitions are installed that form a labyrinth with the possibility of passing seawater through the working zone of the radiators to the device through acoustic Exchanges 6 and 7 are connected inlet 8 and outlet 9 nozzles, 1 or about

Description

The invention relates to sea river transport, in particular to devices for protection against overgrowth of commercial systems using seawater.

Known devices for the protection of dry systems, which are based on the negligence of larvae of fouling agents with active chlorine; on water treatment of copper sulphate and other chemicals and on the use of radioactive research

However, all of these methods are based on the destruction of the sprinklers themselves and their larvae, which in turn are food for more highly developed organisms, these methods damage the environment, contaminate it with toxic elements and destroy bioplankton

It is also known a device for the ultrasonic protection of ship systems of the outboard water, which includes an ultrasonic emitter.

components with

The disadvantages of this device are the large weight and size characteristics of the equipment used and its high energy consumption. This is caused by the following. To destroy the larvae of fouling plants takes several tens of seconds, therefore at high flow rates of seawater for sounding water during a specified time a significant area of sounding is required. For example , at a flow rate of 0.35 m / s (average flow rate in the cooling systems of ship engines), a length of several meters is required, and This leads to greater energy consumption and more emitters used for these purposes.

The purpose of the invention is to reduce energy consumption and weight and size characteristics used to protect equipment

This goal is achieved by the fact that in the device for ultrasonic protection of shipborne seawater systems, including ultrasonic emitters installed on the walls of the inlet channel of the ship's system, equal-sized partitions are installed perpendicular to the radiating surfaces of the emitters, forming a maze with the possibility of passing seawater through

the working area of the emitters, with the number of partitions n chosen from the ratio

S.I-

1l2h - N)

five

five

0

five

0

five

where Q is the performance of the server

pump;

S is the smallest cross-section of the bore in the working area of the emitters;

T is the time of destruction of fouling agents;

In - the length of the working area of the emitters;

h is the height of the partitions; H is the height of the working zone of the emitters (the distance between the emitters)

In the drawing pokahano proposed device, the general view of

The device consists of two magnetostrictive transducers 1 and 2 (for example, of the type ПМС-6-22), located with radiating surfaces 3 and 4 on the walls of the pipe (channel) towards each other. The distance H between the radiating surfaces is chosen to be less than or equal to twice the value of the height of the cavitation zone from the radiator (for PMS-6-22 N 150 x 2 300 mm).

Perpendicularly radiating surfaces 3 and 4 are installed equal-sized partitions 5, forming a labyrinth with the possibility of passing seawater through the working area of the radiators

To the device, through acoustic isolations 6 and 7, inlet 8 and outlet 9 are connected.

To derive this ratio, let us consider a typical specific example of the implementation of an anti-fouling device for engine cooling systems, where the average flow rate of seawater is 0.35 m / s. The nominal diameter of the pipeline system is D0 100. I

The length of the radiating surface of the emitters is equal to B (for PMS-6-22 B OOO mm). The height of the partitions is h, the distance between the partitions is 1.

It can be seen in the drawing that the length of the minimum flow line L is recorded in a view.

L + 2 (2h - H) «nl + 2n (2h - H).

In order for all fouling agents to be destroyed during the passage of the working area of the emitters, it is necessary that

9

B5g

T,

Q - the performance of the feed pump (not shown) :,

S is the smallest cross-section of the bore in the working area of the emitters;

T is the time of destruction of emitters and

1 -V 2n (2h - H)

S

Taking into account that p-1 B, after elementary transformations receive

| .Т - В

n 2 ()

For example, for the case of using emitters of the type ПМС-6 in protecting the fouling of engine cooling systems, taking T 10 s, we get 7.

Know n, for this case, we find the minimum length of the flow path of the seawater: L 3660 mmo

Thus, for a specific case, instead of sounding a pipeline section of length 3660 mm, a section of length equal to (c) 300 mm is voiced, which is approximately 12 times less

0

In order to sound the section with a length of 3660 mm without the partitions offered by us, we would need 12 transducers instead of 2.

The device works as follows

Simultaneously with the start of operation of the ship's system, magnetostrictive transducers 1 and 2 are switched on. The outboard water flow through the inlet 8 enters the working area of transducers 1 and 2. In the working area, the flow passes through the maze formed with partitions 5, the extension path and the time spent separately the amount of water in the working area, due to which the overgrowths exposed to ultrasonic vibrations are completely destroyed

Claims (1)

Invention Formula A device for ultrasonic protection of shipborne seawater systems against fouling, containing ultrasonic emitters installed on the walls of the inlet pipe of the system, characterized in that, in order to reduce energy intensity and overall dimensions, it is provided with equal-sized partitions installed perpendicular to the specified pipe checkerboard walls with the formation of a labyrinth channel