RU2368435C2 - Device for ultrasound cleaning of parts - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: proposed device comprises service bath, piezo-electric converters, damper of parasitic bending oscillations. Rounded casing of aforesaid bath features parametres that allow its operation at resonance frequency. Inlet and outlet branch pipes with valves are attached to the said casing, one of the valves being connected to the pump. Acoustic conductors representing detachable or clamping inserts are arranged inside the bath.

EFFECT: higher efficiency of cleaning.

3 cl, 3 dwg

Description

The invention relates to the cleaning of parts from contamination in an acoustic field of ultrasonic frequency, in particular fuel assemblies at nuclear power plants.

A known ultrasonic installation containing an ultrasonic bath, piezoelectric transducers, a damper of bending stray vibrations, made in the form of separate massive rings covering the emitters of the respective transducers and located from them at a distance multiple of nL / 4, where L is the wavelength in the material of the bottom of the bath, p = 1, 2, 5 ...

RU No. 2188085, IPC B08B 3/12.

A disadvantage of the known ultrasonic installation is the low cleaning efficiency of parts located in the housing, for example, tubes with nuclear fuel in the fuel assembly unit at nuclear power plants.

The tasks to which the proposed solution is directed are to increase the efficiency of cleaning parts from contaminants in the housing.

The technical result is achieved in that the installation of ultrasonic cleaning of parts contains a process bath, piezoelectric transducers, a damper of parasitic bending vibrations, while the process bath is made in the form of a round pencil case having certain parameters, ensuring its operating modes at a resonant frequency, and to which the input and outlet nozzles with valves, one of which is connected to the pump, and between the inner side of the case and the body with the workpiece (tubes Sun) are acoustic conductors formed as removable or clamping inserts, configured in a resonance mode with a housing, which contains the workpieces, and each piezoelectric transducer is electrically connected with a control unit that provides individual or joint pogruppovoe or inclusion of piezoelectric transducers.

The drawings show the installation of ultrasonic cleaning of parts:

Figure 1 is a General view.

Figure 2 is a section.

In Fig 3 - the same with the inserts.

Installation of ultrasonic cleaning of parts contains a pencil case 1, on the outer side of which there are piezoelectric transducers 2, a damper of parasitic bending vibrations (not shown in the drawing). Case 1 has two nozzles 3 and 4 with valves 5 and 6, while the nozzle 5 is connected to a pump (not shown). Pencil case 1 is located in an airtight casing 7. The parameters of the pencil case 1, as well as the location of the piezoelectric transducers 2, ensure that the pencil case 1 operates in resonant mode. Between the inner surface of the canister 1 and the housing 8, in which the workpieces are located, there are removable or clamping inserts 9, which are in close contact with the canister 1, the housing 8, in which the workpieces are located. Insert 9 provide good acoustic conductivity of ultrasonic waves from the pencil case 1 to the housing 8 with the workpiece. The piezoelectric transducers 2 are electrically connected to the control unit 10, which provides various operating modes of the piezoelectric transducers 2, including their group inclusion. This expands the possibilities of cleaning parts with varying degrees of contamination.

The principle of operation of an ultrasonic cleaning unit is as follows. Contaminated parts located in the housing 8, for example, tubes with nuclear fuel in the fuel assembly unit at nuclear power plants, are loaded into the canister 1 through the open valve 5, then the valve 5 is closed; the pump is turned on (not shown in the drawings), connected to the inlet pipe 3, and the necessary pressure is created in the washing medium, for example 3-7 atm (the washing medium fills the cavities of the canister 1 and body 8), while valves 5 and 6 are tightly closed. Then, the piezoelectric transducers 2 are turned on in certain and required modes, as a result, an ultrasonic frequency acoustic field (f = 20 kHz) is created in the washing medium and ultrasonic vibrations are transmitted through the housing 8 to the washing medium and to the surfaces of the workpieces.

Cavitation bubbles interacting with salt deposits on the surface of the parts (tubes of the fuel assembly unit), clean their surfaces from contamination. The resonant mode of operation of the canister 1 creates the maximum possible acoustic field density in the washing medium, while the resonance in the fuel assemblies tubes (workpieces) is excluded and this ensures the safety of nuclear fuel in the fuel assemblies. In cases of severe contamination of the workpiece between the pencil case 1 and the housing 8 are placed removable or clamping inserts 9, which are good conductors of ultrasonic vibrations. The design of the installation of ultrasonic cleaning of parts also allows you to work in a constant flow of detergent through the housing 8 with the workpiece. An ultrasonic cleaning unit for parts ensures effective cleaning of the fuel assembly unit tubes from salt deposits at nuclear plants with varying degrees of pollution.

Claims (3)

1. Installation of ultrasonic cleaning of parts containing a technological bath, piezoelectric transducers, a damper of parasitic bending vibrations, characterized in that the technological bath is made in the form of a round pencil case having certain parameters, ensuring its operating modes at a resonant frequency, and to which the input and output nozzles with valves, one of which is connected to the pump, and there are acoustic conductors between the inside of the case and the body with the workpieces, olnennye as removable inserts or clamping. 2. Installation according to claim 1, characterized in that each piezoelectric transducer is electrically connected to a control unit that provides individual, or group, or joint inclusion of the piezoelectric transducers. 3. Installation according to claim 1, characterized in that the removable or clamping inserts are configured in resonance mode with the housing in which the workpiece is located.

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