US3021120A

US3021120A - Ultrasonic irradiating device

Info

Publication number: US3021120A
Application number: US793565A
Authority: US
Inventors: Burgt Cornelis Martinus Va Der
Original assignee: US Philips Corp
Current assignee: US Philips Corp; North American Philips Co Inc
Priority date: 1958-02-05
Filing date: 1959-02-16
Publication date: 1962-02-13
Anticipated expiration: 1979-02-13
Also published as: DE1104236B; CH368002A; US3021119A; GB876248A; FR1216842A; GB876249A; DE1108964B; FR1215458A

Description

Feb. 13, 1962 c. M. VAN DER BURGT ,0 20

ULTRASONIC IRRADIATING DEVICE Filed Feb. 16, 1959 2 Sheets-Sheet 1 LIQUID SOURCE LIQUID STORAGE INVENTOR CORNELIS M. VAN DER BURGT BY f -=--....2.

AGE

Feb. 13, 1962 c. M. VAN DER BURGT 3,021,120

ULTRASONIC IRRADIATING DEVICE Filed Feb. 16, 1959 2 Sheets-Sheet 2 FIG.3

INVENTOR GORNELIS VAN DER BURGT four segments.

3,@Zl,l2 Patented Feb. 13, 1962 3,021,120 ULTRASONIC DIA'IING DEVICE Cornelis Martinus van der Burgt, Einrlhoven, Netherlands, assignor to North American Philips Company,

Inc., New York, N.Y., a corporation of Delaware Filed Feb. 16, 1959, Ser. No. 793,565 Claims priority, application Netherlands Feb. 20, 1958 Claims. (til. 25972) The present invention relates to an ultrasonic irradiating device. More particularly, the invention relates to an ultrasonic irradiating device of the type described in copending United States patent application Serial No. 785,- 830, filed January 9, 1959.

In the ultrasonic irradiating device of the type of the present invention, the ferrite ring and the core and primary winding of the transformer are wholly surrounded by the extension of the wall of the vessel, so that said parts are housed in a space which is fully closed.

The present invention constitutes an improvement over the device described in said copending application.

According to the present invention, at least part of the extension of the wall of the vessel is constituted by one and preferably tWo or more individual current conductors.

The device of the present invention, which is formed as an integral unit, is simple and compact due to the absence of a separate secondary winding on the ferrite ring and has a very high electroacoustic efficiency.

A In order that the invention may be readily carried into effect, it will now be described with reference to the accompanying drawings, wherein:

FIG. 1 is a longitudinal section of the ultrasonic irradiating device of the type of the present invention;

FIG. 2is a pair of cross-sections taken along the lines IIII of FIG. 1, modified to illustrate another embodiment of the device of the present invention; and

FIG. 3 is a pair of cross-sections taken along the lines IIII of FIG. 1, modified to illustate still another embodiment of the device of the present invention.

An ultrasonic irradiating device of the type of the present invention comprises a vessel 1 which is set into vibration in radial directions for the ultrasonic treatment of liquids or matter in liquids. The wall of the vessel 1 may be of piezomagnetic or magnetostrictive material. The wall is surrounded by at least one piezomagnetic ferrite ring 2 and/ or 3 which, in turn, is surrounded by an extension 8 of the wall of the vessel 1 at one end of said vessel. Each of the

ferrite rings

2 and 3 comprises Thin ferromagnetic discs 4, comprising, for example, Ferroxdur, are positioned between the segments of the

ferrite rings

2 and 3. The discs 4 are magnetized in the direction of the arrows, for the purpose of pie-polarization. The extension of the wall surrounds the core 5 of the supply transformer with the primary winding 6 and is connected to the

other end

9, 10 of the vessel, thereby forming a single closed secondary winding of which the wall of the vessel forms part. A liquid, preferably degassed, is provided in the space 12 between the Wall of the vessel and the ferrite ring as a medium for transmitting the vibration from said rings to said vessel. The primary winding 6 comprises two parts and is connected to an electrical energy generator 7 operating at an ultrasonic frequency. The

rings

2 and 3 are resiliently suspended in the cylindrical extension 8 in liquidtight sponge rubber or sponge plastic rings 11.

Reference numerals

13 and 14 indicate a sealing plate and a sealing rings for the liquid in the space 12. The plate 13 and rings 14 consist of electric insulating material.

The

rings

2 and 3 are set into vibration in radial directions by the magnetic field produced by the cylindrical extension 8 which acts as the secondary winding of the transformer by cutting the magnetic field produced by the primary winding 6 of said transformer. Since the

rings

2 and 3 are piezomagnetic ferrites they vibrate or are displaced physically under the influence of the magnetic field provided by the cylindrical extension 8. The vibration is transmitted via the liquids in the space 12 to the vessel 1 which contains either the liquid to be treated or the object to be treated, immersed in liquid. No vibration energy is lost in an outward radial direction due to the insulating action of the rings 11. If the portion 10 is in the form of a tube, as shown, a continuous flow of liquid can be treated, provided the upper side of the vessel 1 is provided with a supply tube.

The term ultrasonic is to be understood in this case to mean also audible frequencies upwards of 10 kilocycles per second.

In accordance with the present invention, the cylindrical extension 8 of FIGS. 1 and 2 is in the form of strips or segments. In FIG. 3 according to the invention the current conductors consist of four strips 8 or flexible cables which may be arranged in a simple manner, more particularly symmetrically around the vessel 1.

The current conductors 8 may extend with respect to the wall of the vessel in radial directions or in more or less tangential directions, so that the portions of the secondary winding, formed by the cylindrical extension, not belonging to the wall of the vessel may fundamentally have the shape of, for example, a birds cage.

Since the surrounding outer portion 8 of the secondary winding, formed by the cylindrical extension, is not closed, the transformer is also cooled more satisfactorily.

According to another feature of the invention, at least a portion of the cylindrical extension 8 consists of conductive gauze material as illustrated in the embodiment of FIG. 2, which fully surrounds the ferrite ring and the core of the transformer, thus protecting said parts.

Suitable ferrite materials for making the

rings

2 and 3 of the ultrasonic transducer, are well known and are described, for example, in the article, Ferroxcube Material for Piezomagnetic Vibrators, by the present inventor, published in the Philips Technical Review, volume 18, No. 10, March, 1957, pages 285298. Suitable materials for the discs 4 are disclosed, for example, in the publication Ferroxdure, a Class of New Permanent Magnet Materials by l. I. Went et al., Philips Technical Review, volume 13, No. 7, January 1952, pages 194- 208.

What is claimed is:

1. In an ultrasonic irradiating device comprising an electrically conductive vessel adapted to hold a liquid, a piezomagnetic ferrite ring positioned substantially coaxially around the said vessel, said ring being coupled to said vessel for transmitting vibration thereto, a primary transformer winding and input means for electrical energy generating means operating at an ultrasonic fre quency for energizing said primary winding, means for inducing piezomagnetic vibrations in said ring comprising a secondary transformer winding, said secondary winding comprising said vessel and an extending portion thereof and being positioned substantially surrounding said ring and in inductive proximity to the said ring and to said primary winding, at least a part of said extending portion comprising at least a pair of current conducting strips arranged symmetrically around said vessel.

2. In an ultrasonic irradiating device comprising an electrically conductive vessel adapted to hold a liquid, a piezomagnetic ferrite ring positioned substantially coaxially around the said vessel, said ring being coupled to said vessel for transmitting vibration thereto, a primary transformer winding and input means for electrical energy generating means operating at an ultrasonic frequency for energizing said primary winding, means inducing piezomagnetic vibrations in said ring comprising a secondary transformer winding, said secondary winding comprising said vessel and an extending portion thereof and being positioned substantially surrounding said ring and in inductive proximity to the said ring and to said primary winding, at least a part of said extending portion comprising at least a pair of current conducting strips spaced apart and arranged symmetrically around said vessel in substantially cage-like configuration and electrically interconnecting spaced portions of said vessel.

3. In an ultrasonic irradiating device comprising an electrically conductive vessel adapted to hold a liquid, a piezomagnetic ferrite ring positioned substantially coaxially around the said vessel, said ring being coupled to said vessel for transmitting vibrations thereto, a primary trans-former winding and input means for electrical energy generating means operating at an ultrasonic frequency for energizing said primary winding, means inducing piezomagnetic vibrationsin said ring comprising a secondary transformer winding, said secondary winding comprising said vessel and an extending portion thereof and being positioned substantially surrounding said ring and in inductive proximity to the said ring and to said primary winding, at least a part of said extending portion comprisin a conductive gauze material surrounding said ring and said primary Winding.

4. In an ultrasonic irradiating device comprising an electrically conductive vessel adapted to hold a liquid, a

comprising a secondary transformer winding, said secondary winding comprising said vessel and an extending portion thereof and being positioned substantially sur rounding said ring and in inductive proximity to the said ring and to said primary winding, at least a part of said extendingportion comprising at least a pair of current conducting strips arranged symmetrically around said vessel, and resilient material positioned between said ring and said extending portion for suspending the said ring.

5. In an ultrasonic irradiating device comprising an electrically conductive vessel of piezomagnetic material adapted to hold a liquid, a piezomagnetic tferrite ring positioned substantially coaxially around the said vessel, fluid means between said vessel and said ring for transmitting vibrations therebetween, a primary transformer winding and input means for electrical energy generating means operating at an ultrasonic frequency for enengizing said primary winding, means for inducing piezomagnetic vibrations'in said ring comprising a secondary transformer winding, said secondary winding comprising said vessel and an extending portion thereof and being positioned substantially surrounding said ring and in inductive proximity to the said ring and to said primary Winding, at least a part of said extending portion comprising at least a pair of current conducting strips arranged symmetrically around said vessel in substantially cage-like configuration, and resilient material positioned between said ring and said extending portion for suspending the said ring.

References Cited in the file of this patent UNITED STATES PATENTS 2,565,159 Williams Aug. 21, 1951 2,713,127 Harris July 12, 1955 2,761,077 Harris Aug. 28, 1956