RU2398499C1 - Device for hydrodynamic heating of liquid products - Google Patents

Abstract

FIELD: food industry.

SUBSTANCE: invention relates to devices for treatment of liquid products by heating. Device comprises stator with cylindrical rotor installed in it to make gap. On external surface of rotor there is a set of cells arranged in rows along helical line. On internal surface of stator there are similar cells arranged along helical line as well, but with another pitch of cell rows. Stator vessel includes axisymmetric circular cavity that corresponds to rotor length and communicates with cellular working part of device through hole in zone of product heating up to pasteurisation temperature.

EFFECT: invention makes it possible to provide for uniformity of load at rotor in process of its rotation and to increase efficiency of device.

4 cl, 3 dwg

Description

The invention relates to the field of agriculture, in particular to devices for processing liquid products by heating, including their pasteurization.

Known industrial cavitation generator company "Hydrodynamic inc", USA, for heating a liquid, comprising a housing with covers and a rotor in the form of a drum with a mesh outer surface in contact with the smooth inner surface of the cylindrical part of the housing / 1 /.

A disadvantage of the known design is the bulkiness of the device and insufficient thermal performance.

The closest technical solution to the proposed invention is a device for heating a liquid containing a stator with recesses on the inside, installed inside it with a gap for moving and heating the processed product, a rotor in the form of a cylinder with a set of recesses similar to the recesses of the stator, forming an alternating chamber sections, and nozzles for supply and discharge of the product / 2 /.

Its disadvantages are rather high heat losses to the environment and unevenness or ripple of the load due to the simultaneous coincidence during rotation of the rotor of all cells and their closure, accompanied by a cut of the liquid product in the gap of the rotor-stator.

The objective of the claimed technical solution is to ensure uniform load on the rotor during its rotation and increase the efficiency of the device.

It is solved by the fact that on the outer surface of the rotor there is a set of cells arranged in rows along a helical line, on the inner surface of the stator - similar cells located also along a helical line, but with a different step of the rows of cells, in the stator housing of the proposed device, the axisymmetric rotor length is made an annular cavity that acts as a retainer and heat insulator of the working part of the heater from the external environment, communicating with the cellular working part of the device with an opening in the product heating zone to t pasteurization temperatures.

The invention is illustrated by drawings, where figure 1 shows a schematic section of a device for hydrodynamic heating of liquid products along its longitudinal axis; figure 2 is a section aa of the device of figure 1; figure 3 is a fragment of a scan of the mutual arrangement of cells on the surfaces of the stator and rotor.

A device for hydrodynamic heating of liquid products consists of a stator 1 (Fig. 1) in the form of a hollow cylinder with a rotor 2 located with a gap in its cavity, closed by covers 3 and 4 on both sides, in which bearings 5 and 6 of the rotor shaft 7 are installed. Inside the stator 1 there is an axisymmetric annular cavity 8 (Fig. 2), which acts as a retainer, the volume of which corresponds to the specific performance of the device for hydrodynamic heating of liquid products. It also serves as a heat insulator of the working part of the proposed device from the external environment.

On the outer surface of the rotor 2, a set of cells 9 is made, for example oblong, arranged in rows along a helix with a pitch t (Fig. 3) at an angle α.

On the inner surface of the stator 1, similar cells 10 are made, also located along a helix, but with a different step of the rows of cells, providing a change in the number of rows of cells on the stator 1, for example, by one row in comparison with the number of rows of cells on the rotor 2 and their step offset by the value of b. The angle β of the tilt of the rows of cells 10 on the stator 1 can be equal to or greater than the angle α of the tilt of the rows of cells 9 of the rotor 2. Moreover, the axes of the elongated cells of the stator 1 can be parallel to the axes of the cells of the rotor so that when they coincide, closed chambers are formed.

The device for hydrodynamic heating of liquid products has a supply pipe 11 of the product for heat treatment in it and a pipe outlet 12 of the product after heat treatment, communicating with the cavity 8 of the stator 1, which in turn is connected through a hole 13 to the cellular working part of the device.

The stator 1 and the rotor 2 of the device can be conical.

The device operates as follows.

The liquid product arriving for heat treatment through the supply pipe 11 fills the cells 9 and 10. When the rotor 2 is rotated, it is captured by the rows of its cells 9, like pump blades inclined at an angle α, providing self-absorption of the product into the device. In the gap between the rotor 2 and the stator 1, the product is subjected to intense hydrodynamic effects due to centrifugal acceleration by the cells 9 of the rotor, a sharp braking by the cells 10 of the stationary stator 1, intense vortex formation, friction of the product layers between each other and about the surface of the stator 1 and rotor 2. As a result, the transformation the drive energy supplied to the device into the thermal energy absorbed by the processed product, heating it to the pasteurization temperature. At this temperature, the heated product through the hole 13 enters the stator cavity 8 for soaking, and then is discharged through the branch pipe 12 from the device to the line for further heat treatment: regeneration, cooling and storage.

The different step t of the rows of cells 9 and 10 on the stator 2 and anchor 1 and their angles of inclination β and α along the helix provide their alternate closure and subsequent gradual opening as the rotor 2 rotates, which reduces the ripple of the load on the hydrodynamic processing of the product in the device drive and aligns her.

The location of the holder in the annular cavity 8 of the stator 1 provides a reduction in heat loss from the working cellular part of the device into the environment, which increases its efficiency.

Information sources

1. Jim Frederick, Daniel Armstead, Steve Lien, Wolfgang Schmidl, Bijan Kazem. Economic Benefits of Utilizing Controlled Cavitation Technology for Black Liquor Oxidation and Heating. TAPPI Journal, January, 2002.

2. Copyright certificate RU No. 1324620, class. A23C 3/033, 1987 (prototype).

Claims (4)

1. A device for hydrodynamic heating of liquid products, characterized in that it consists of a stator with a cylindrical rotor installed in it to form a gap, on the outer surface of the rotor a set of cells arranged in rows along a helical line is made, similar cells located on the inner surface of the stator also along the helix, but with a different step of the rows of cells, in the stator housing an axisymmetric annular cavity corresponding to the rotor length is made, communicating with the cellular working part stroystva opening in the heating zone of the product to the pasteurization temperature. 2. The device according to claim 1, characterized in that the helical location of the rotor cells is made at an angle of inclination to the generatrix of its outer surface less or greater than the angle of inclination of the helical cell location line to the generatrix of the inner surface of the stator. 3. The device according to claim 2, characterized in that the elongated cells of the rotor and stator are made so that their longitudinal axes are parallel to each other. 4. The device according to claim 1, characterized in that the rotor and stator in the place of their articulation are made conical.

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