RU2510850C2 - Ultrasonic milk treatment device - Google Patents

Abstract

FIELD: food industry.

SUBSTANCE: flow-type ultrasonic milk treatment device contains ring-shaped piezosources of ultrasonic radiation assembled in the form of a hollow cylinder. The ultrasonic radiation sources are positioned so that the distance between such ultrasonic radiation sources and the milk duct wall is divisible by the ultrasound semi-wave length. The milk duct has a delivery and a discharge nipples; the resonance membrane is made of elastic rubber and positioned on the cylinder so that to enable radiation penetration outside through it. The milk duct represents a semicircular tray installed round the cylinder along a helical line. . The conjugated walls of the trays are interconnected with spot welding with the ends deflected in a semicircular manner to accommodate a sealing hose made of food rubber to that to enable gas or liquid supply through the said hose. On the milk duct coils there are indentations made for creation of a turbulent flow mode and intensive stirring of the milk being treated. Positioned on the helical milk duct surface are reinforcement ribs partly embedded into the indentations of the coils, the curved ends whereof are tightened with clips having clamping levers.

EFFECT: enhancement of milk treatment performance and quality combined with design simplification and operation convenience improvement.

5 cl, 4 dwg

Description

The invention relates to devices for disinfecting liquids by means of ultrasonic radiation, and can be used to sterilize and homogenize milk, as well as drinking water, juices, drinks, fuel oil emulsions, the manufacture of paints, lubricants, emulsions and suspensions, etc.

A device for processing liquid media containing an even number of sections equipped with a source of ultrasonic radiation, nozzles for supplying and discharging liquid, the distances between the radiation sources and the walls of the sections are multiples of the half-wave length of ultrasound (RF Patent No. 2188797 C1, IPC C02F 1/36. 2002).

The device has stagnant zones, low productivity. Washing and cleaning internal surfaces is difficult.

Known ultrasonic sterilizer of liquid products, equipped with a tank, a discharge pump with an air ejector and a controlled air valve with an air intake, and in the vertical chamber at the bottom is an ultrasound source, and at the top is a liquid level sensor (RF Patent No. 2241357 C2, IPC A23L 3/30, 2004 )

The sterilizer has a low productivity and low quality of sterilization due to the installation of one ultrasonic emitter, i.e. insufficient processing time.

The prototype is a flow-type ultrasonic disperser containing a piezoelectric transducer with overlays made integrally with concentrators with resonant membranes fixed at the output ends, having slot and ring gaps (RF Patent No. 2221633 C2, IPC B01F 11/02, 2004).

The dispersant has a complex device and stagnant zones; disassembling it for washing and cleaning work surfaces is difficult and time-consuming.

The technical result of the claimed invention is to increase the productivity and quality of milk processing while simplifying the design and improving ease of use.

A device for ultrasonic processing of flow-through milk containing piezoelectric sources of ultrasonic radiation of a circular shape assembled in the form of a hollow cylinder, the distance between the sources of ultrasonic radiation and the wall of the milk pipe being a multiple of the ultrasound half-wave length, the milk pipe with inlet and outlet pipes, the resonant membrane is made of elastic rubber and placed on the cylinder with the possibility of radiation passing through it outward, the milk pipe is a semicircular tray, installed around the cylinder in a helical line, the conjugate of the tray are interconnected by spot welding and the ends of the walls are bent in a semicircle to accommodate a sealing rubber hose of food to supply therethrough of gas or liquid; recesses were made on the turns of the milk pipeline to create a turbulent flow regime and intensive mixing of the processed milk, stiffeners were placed on the outer surface of the screw milk pipeline partially entering the recesses of the turns, the curved ends of which are pulled together with clamps with clamping levers.

Figure 1 shows a device for ultrasonic processing of milk in longitudinal section; figure 2 is a top view of the device; figure 3 is an enlarged cross section along aa from figure 1; figure 4 is an enlarged image of the pairing of piezoelectric sources with a milk line.

The piezoelectric sources 1 of ring-shaped ultrasonic radiation with external radiation are assembled in the form of a vertical hollow cylinder and axially pulled together by a rod 2 through the upper 3 and lower 4 pads, the upper disk 5 and the washer 6, the lower disks 7 and 8 with the wing 9. The upper part of the rod 2 has a hook 10 for hanging the device. The cylinder seal is achieved by gaskets 11 between the piezo source rings 1 and the resonant membrane 12 in the form of a hose with thin walls of elastic food rubber. The milk line 13 in the form of a helical line 14 is formed from trays 15 of a semicircular shape made of food stainless steel, the conjugate walls of which are connected by spot welding and the ends 16 are bent in a semicircle to accommodate the sealing hose 17 from food rubber. The milk pipe at the ends has nozzles for supplying 18 and milk outlet 19. On the outer surface of the screw milk line are placed ribs 20 stiffness, partially entering the recesses 21 of the turns. The ends of the stiffeners are bent inward to contact with the linings 3 and 4 and pulled together with clamps 22 and 23 with quick-release levers 24. Inside the hollow cylinder there is a high-frequency cable 25 from a high-frequency generator (not shown in Fig.), Which supplies current to the ultrasonic emitters 1 via cable 26 .

The device operates as follows.

The distance between the sources of ultrasonic radiation and the wall of the milk line is a multiple of the half-wave length of the ultrasound. A gas or liquid is supplied to the sealing hose 17. Processed milk through the supply pipe 18 is fed into a spiral milk line 13, where it is subjected to ultrasonic treatment by means of ultrasonic radiation sources 1. The presence of dents - recesses 21 on the turns 14 of the milk line creates a turbulent mode and intensive mixing of milk. The acoustic field of ultrasonic radiation causes cavitation (volumetric formation of vapor-gas caverns and pulsating vortices), leading to the breaking of protein, fat and carbohydrate chains, damage to the membranes of microorganisms and their destruction at the cellular level. In this case, inactivation of pathogenic microflora and destruction of macromolecules and anglomerates, i.e. homogenization of fat globules.

The implementation of the device in the form of a cylinder with a spiral milk pipe significantly increases the exposure time required for pasteurization of milk.

To wash the working surfaces of the device and disassemble it, the pressure is released from the sealing hose 17, the clamps 22 and 23 are released and the spiral milk pipe is pulled out from the cylindrical surface of the piezoelectric sources 1 of ultrasonic radiation.

Simplicity of design, speed of disassembly - assembly for washing and low energy consumption characterize the proposed device for ultrasonic processing of milk.

Claims (4)

1. A device for ultrasonic processing of flowing milk type containing piezo sources of ultrasonic radiation of a circular shape, assembled in the form of a hollow cylinder, and the distance between the sources of ultrasonic radiation and the wall of the milk pipe is a multiple of the half-wave length of ultrasound, the milk pipe with inlet and outlet pipes, characterized in that the resonant membrane made of elastic rubber and placed on the cylinder with the possibility of radiation passing through it outward, and the milk line is a semi-circle tray a helical form mounted around the cylinder along a helix. 2. The device according to claim 1, characterized in that the mating walls of the trays are connected by spot welding and the ends are bent in a semicircle to accommodate the sealing hose from food rubber with the possibility of supplying gas or liquid through it. 3. The device according to claim 1, characterized in that the recesses are made on the turns of the milk pipeline to create a turbulent flow regime and intensive mixing of the processed milk. 4. The device according to claim 1, characterized in that on the outer surface of the screw milk line are placed stiffeners, partially included in the recesses of the turns, the curved ends of which are pulled together with clamps with clamping levers.

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