Multilayer bottom of the reservoir for the high-temperature processing of food products and method ot its production

FIELD: food industry.

SUBSTANCE: multilayer bottom of the reservoir is used in the production of the dishware for high-temperature processing of food products. The bottom consists of two fixedly connected layers made of different materials motonically increasing from the center to the periphery. The contact line is made in the wavelike amplitude and the ratio to the wave length. Besides the maximum wave amplitude doesn't exceed 0,1-0,3 of the thickness of the most thin layer. The method of multilayer bottom production includes the connection of different materials by explosive welding. The driver material is made in the form of asymmetric rotary shell segment which axis is set perpendicularly to the fixed plate. The crowned surface of the shell turns to the fixed plate. Then the materials are connected with the explosive material layer posed on the concave surface of the layer with further activation in the center. Curve radius is defined according to the set ratio: where K - curve radius of the shell, a - angle between the axis and shell normal, r - interval between the center of the fixed plate and its crossing point with the normal, 5 - shell thickness, X - wave length of the welding seam in the distance from the center of the plate, and II are quickness of an explosive and the shell in the crossing point with the normal.

EFFECT: to increase the fatigue limit of the reservoir for the high-temperature processing food products.

2 cl, 3 dwg

 

The present invention relates to the food industry and can be used for catering and home cooking, for example, heat treatment of food when frying or cooking.

Famous bottom in the device for thermal treatment of food products, such as pots and pans [1].

Described device, when the heat treatment is often unevenly heated layers of food, especially adjacent to the bottom, which when heat from the heat source itself is heated unevenly. The result is a decrease in the nutritional value of cooked food due to partial overheating of some areas and insufficient heat treatment of others.

The closest to the claimed invention to the technical essence and the resulting effects are layered bottoms in devices for heat treatment of food products and method for their manufacture [2, 3].

These bottoms contain along with structural steel layers at least one fixed under a layer of copper or aluminum, which is partially redistributes heat flow, making the heating of the heating of the ware surface more uniform. However, as the distance normal to the heat source in the center of the bottom is smaller than the periphery, and the conditions of heat transfer everywhere one is the same, it overheated and burnt food in the center is not completely excluded, while its warming up enough on the periphery requires additional heat consumption.

The most progressive method of manufacturing such heads is molding them using explosion welding. The known method involves placing between the explosive charge and a welded plate intermediate element from an inert material wedge-shaped with a constant angle of 3 to 20°. This implementation of the method of manufacture allows, within certain limits, to adjust the speed of the point of contact welding, but does not affect the surface characteristics of connected materials, this increases the mass of the charge required to accelerate inert material.

To eliminate these disadvantages of the proposed layered the bottom of the tank for thermal treatment of food products, comprising at least two rigidly interconnected layers of dissimilar materials, and the boundary of contact between them is made wave with amplitude and its relation to the wavelength, monotonically increasing from the center to the edges, and the maximum amplitude of the wave does not exceed 0.1-0.3 thickness of the thinnest layer. Made this layered the bottom connection of dissimilar materials welding by explosion, with a welded material perform as axisymmetric segment of a surface of rotation, and the axis it is placed perpendicular to a fixed plate to which pay convex surface of the shell, and connect the material with a layer of explosive is placed on the concave surface of the shell with the subsequent initiation in the center, and the radius of curvature of the shell is determined by the ratio:

where R is the radius of curvature of the shell,

α is the angle between the axis and the normal of the shell,

r is the distance from the center of the fixed plate to its intersection with the normal,

δ - thickness of the shell,

λ is the wavelength of the weld at a distance r from the center of the plate,

D and U is the velocity of detonation of the explosive and the shell at the intersection of the normal, respectively.

The technical effect of the claimed technical solution is achieved that provides more uniform heating of the surface of the bottom facing the processed food. This is achieved by performing the boundary of contact between the individual layers wave with amplitude and its relation to the wavelength, monotonically increasing from the center to the edges. More developed contact surface on the periphery allows more intensively to transfer heat to the surface of the plate that aligns the temperature gradient from the centre to the periphery and provides a uniform PR the grove of all food. This allows you to reduce power consumption. The maximum wave amplitude not exceeding 0.1-0.3 thickness of the most thin layer, helps to ensure consistency of deformation of all of the layers during heating. All this serves to provide the high nutritional value of prepared food, while reducing the consumption of heat.

The essence of the proposed technical solution is illustrated in figure 1, which depicts a top view cross-section of a multilayer bottom on the interface of two layers, figure 2, depicting a cross-section of a layered bottom, and 3 with the layout of the charge and the linked materials.

Layered the bottom of the tank for thermal treatment of food products include, for example, two rigidly interconnected layer of heterogeneous materials: a substrate 2 and a welded layer 1, which turns the workpiece 4, made in the form of axisymmetric segment of the shell of revolution under the influence of explosives 5. The boundary of contact between them is made wave 3 with amplitude monotonically increasing from the center to the edges, and the maximum amplitude of the wave does not exceed 0.1-0.3 thickness of the most thin layer.

The device operates as follows. The heat source affects the bottom at the geometric center. The heat supplied to the substrate 2, made for example of copper, the spread is applied along the normal, heating the layer 1 in contact with food, and at the same time extends tangentially to the periphery. More advanced surface connection 3 on the periphery provides a more intensive heat transfer that allows you to provide uniform heating of the bottom and respectively in contact with it products. Eliminated overheating of food, and used the heat reaches the optimal quantities.

The method of manufacture is illustrated by the following example.

Missile material steel 18CR10NITI performed in the shape of an axisymmetric segment of the shell surface of rotation, for example in the form of a spherical shell with a radius of curvature of 500 mm and a thickness of 0.8 mm Shell pay convex side of the stationary disk of copper M1 thickness of 3 mm and a diameter of 250 mm, after which the axis of the shell combined with the axis of the copper disk. On the inner surface of the shell is placed a layer of explosives with a constant thickness of 8 mm and a density of ρ=0.9 g/cm3made of Ammonite IV.

The gap between the copper and steel layers in the center of the disc was 1.2 mm, an Initiating charge in the centre of the segment was performed detonating cord DSA. After connection of the metal cut out sections from the bottom in the radial direction and analyzed their surface under a microscope with 103-fold increase. The maximum amplitude of the wavy Lin and connections at the edge of the disc has reached 0.25 mm, and to the center it was decreased to 0.03. When the warm-up made of laminated plate gas burner at the geometric center to 300°C for 3 seconds irregularity in radius does not exceed 3-5%, while the known construction shows similar results in 5-8 seconds warm-up.

The tests indicate achievement and a significant increase in the uniformity of heating of the multilayer plate capacity for thermal treatment of food products in comparison with the known structures.

Sources of information

1. Equipment public catering enterprises. Elgina E, and others, M., Economics, 1987, p.129-162.

2. The company's catalog Erringen, www.predmeti.ru/luna-p-30.html, 2010.

3. The method of obtaining permanent connections by explosion welding. RF patent №2185942, Atroshchenko AS and other published 27.02.2002.

1. Layered the bottom of the tank for thermal treatment of food products, comprising at least two rigidly interconnected layers of dissimilar materials, characterized in that the boundary of contact between them is made wave with amplitude and its relation to the wavelength, monotonically increasing from the center to the edges, and the maximum amplitude of the wave does not exceed 0.1-0.3 thickness of the most thin layer.

2. A method of manufacturing a multilayer plate according to claim 1, including a connection RA is popular materials by explosion welding, characterized in that the welded material are in the form of axisymmetric segment of the shell of revolution and the axis have perpendicularly fixed plate to which pay convex surface of the shell and connect the material with a layer of explosive is placed on the concave surface of the shell, with the subsequent initiation in the center, and the radius of curvature of the shell is determined by the ratio:

where R is the radius of curvature of the shell,
α is the angle between the axis and the normal of the shell,
r is the distance from the center of the fixed plate to its intersection with the normal,
δ - thickness of the shell,
λ is the wavelength of the weld at a distance r from the center of the plate,
D and U is the velocity of detonation of explosives and shells on
the intersection of the normal, respectively.



 

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