Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
  • F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
  • F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
  • F25D3/11—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air with conveyors carrying articles to be cooled through the cooling space
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
  • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
  • F25D2317/06—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation
  • F25D2317/068—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the fans
  • F25D2317/0681—Details thereof
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
  • F25D2500/00—Problems to be solved
  • F25D2500/02—Geometry problems

Definitions

• the invention relates to a device for freezing and / or cooling of products with a cooling space, a transport device for conveying the products through the cooling space, at least one device for generating a cold gas atmosphere for the cold room and a suction device for the cold gas and at least one axial cystden fan for Promotion of the cold gas has. Furthermore, a use of this device is the subject of the present invention.
• cooling tunnel and spiral freezers can be cited, in which in each case products are transported through the device and cooled by contact with cryogenic gases. Frequently, cryogenic gases in the liquid and / or gaseous state are used for this purpose. Very well known is the use of liquid nitrogen or liquid carbon dioxide.
• the liquid nitrogen passed through a heat exchanger and expanded by a throttle valve as a relaxation device to be then introduced into a cooling tunnel.
• the expanded gas absorbs heat from the products to be cooled.
• the gas thus heated leaves the cooling tunnel as exhaust gas.
• a suction device is usually used, which sucks the heated gas from the cooling tunnel.
• axial bonnende fans are used.
• the object of the present invention is to provide a device for freezing and / or cooling that is improved over the prior art.
• the object is achieved in that the axis of the at least one fan is mounted inclined to the vertical, the perpendicular serves on the direction of movement of the products as a reference direction and the at least one fan is mounted on the ceiling of the refrigerator, wherein the axis of the fan enclose an angle b with a vector arrow representing the direction of movement of the products, with the origin of the vector arrow placed at the lower end of the axis.
• the formation of a directed flow or circulation of the cold gas is preferably made possible, whereby the convective heat transfer between cold gas and product can be significantly increased with particular advantage.
• the cold gas atmosphere in a conventionally vertically downwardly extending fan axis is forced downwards in the center only in the region of the fan and rises again directly next to it.
• This movement of the cold gas does not constitute a formation of a flow in the sense of the invention, since the cold gas does not leave the vicinity of the fan.
• the formation of a cold gas flow is possible in devices with conventionally mounted fans only via the use of a suction device.
• Direction of movement of the product deviates from the horizontal can be meant perpendicular to the direction of motion in the sense of the invention also perpendicular to the direction of movement. This results in e.g. in the case of a conveyor belt which increases in relation to the horizontal as the transport means, the correct positioning for the axis of the fan according to the present invention.
• Axial-conveying fans are usually equipped with curved-profile rotor blades.
• the preferred flow direction for the cold gas is counter to the direction of movement of the products moved by the transport device, ie in countercurrent.
• the reverse case so the Flow direction of the cold gas parallel to and in the direction of movement of the products to be cooled and / or frozen (DC) be more advantageous.
• the angle b between the axis and the vector arrow is less than 90 °, ie acute angle.
• this arrangement has a delaying or braking effect on the flow of cold gas.
• the relative residence time of a given amount of cold gas in the range of a certain amount of product to be cooled can thus be varied by the choice made for the arrangement.
• various cooling characteristics can be realized, i.
• the speed of the cooling process ie how many degrees (° C) the temperature of a product decreases over a certain period of time, can be adjusted.
• the angle b between the axis and the vector arrow is greater than 90 °, ie obtuse.
• the flow of the cold gas is braked in the case of a counter-current arrangement.
• the flow of cold gas is thereby accelerated, so supported.
• the angle a which includes the axis of the fan with the vertical, in the range of 1 ° to 8 °, preferably in the range of 1 ° to 5 °.
• the axis as already described by the statements made at angle b, can be deflected in or against the direction of movement of the products. Both variants should be covered here with the above-claimed range for the angle a.
• a device for spraying cold gas is provided.
• a cold gas reservoir in particular a cold gas reservoir for liquefied cold gas, is expediently provided.
• a cold gas reservoir for liquefied cold gas is expediently provided.
• Cooling medium withdrawn from the cold gas reservoir at a first higher pressure (e.g., about 3.5 bar for nitrogen, e.g., about 15 bar for carbon dioxide) is fed to a vent and depressurized to ambient pressure. The temperature of the cooling medium thereby decreases. The resulting cold gas stream is introduced into the space for receiving the products to be cooled, e.g. the interior of a cryogenic cooling tunnel, fed and used there to cool the products.
• liquid nitrogen and / or liquid carbon dioxide is provided for generating the cold gas.
• the object of the present invention is further solved by the use of the device according to one of claims 1 to 7 for freezing and / or cooling food.
• the present invention is particularly interesting for sensitive products to be cooled, such as foods or pharmaceuticals, since it is particularly advantageous in these products to be able to influence the cooling characteristic as described.
• FIG. 1 freezer tunnel according to the invention (overview)
• FIGS. 2 to 5 are schematic representations of various components
• FIG. 1 shows a freezing tunnel with all the essential components as
• the freezing tunnel therefore has a cooling space 1 and a transport device 2, on which the products 6 to be cooled rest, and with the aid of which they are supported by the
• Refrigerator in this example from left to right, to be transported.
• the flow of the cold gas leaving the device 3 for producing a cold gas atmosphere, with which the products 6 are sprayed or applied in the region of the device 3, is directed in this example counter to the transport direction of the products.
• the cold gas flows from right to left through the
• Refrigerator 1 The flow is assisted by two fans 4 whose axes 5 are deflected out of the vertical such that in each case the angle b between the axis 5 and the vector arrow, which represents the direction of movement of the products 6, is less than 90 °, ie acute-angled , is. As a result, the flow is supported, that is accelerated compared to a device with conventionally vertically mounted fan.
• the two areas A and B shown in FIG. 1 may be referred to as pre-cooling area A and as cooling area B.
• FIG. 2 shows an angle b between the axis 5 and the vector arrow smaller than 90 °, ie at an acute angle.
• the flow of cold gas is supported by this arrangement.
• the flow direction of the cold gas is indicated in the figures 2 to 5 each by a dashed arrow.
• Figure 3 shows the acute-angled arrangement for the DC case in which it retarding or braking effect on the flow of the cold gas.
• Figure 4 shows another advantageous embodiment of the present invention, in which the angle b between the axis 5 and the vector arrow is greater than 90 °, that is obtuse. In this embodiment, the flow of the cold gas is braked in the case of a counter-current arrangement.
• FIG. 5 shows the obtuse-angled arrangement in the case of a DC arrangement. The flow of cold gas is thereby accelerated, so supported.
• the relative residence time of a given amount of cold gas in the range of a certain amount of product to be cooled can thus be varied by the choice made for the arrangement.
• different cooling characteristics can be realized, ie, for example, the speed of the cooling process, ie by how many degrees ( 0 C), the temperature of a product decreases in a certain period of time, set.
• the suction power of the suction device 7 can advantageously be kept constant.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• Thermal Sciences (AREA)
• General Engineering & Computer Science (AREA)

Priority Applications (1)

Applications Claiming Priority (4)

Publications (1)

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ID=40957306

Family Applications (1)

Country Status (7)

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Family Cites Families (6)

• 2008
  • 2008-12-09 US US12/865,430 patent/US20110197621A1/en not_active Abandoned
  • 2008-12-09 CA CA2715084A patent/CA2715084A1/en not_active Abandoned
  • 2008-12-09 BR BRPI0822268-1A patent/BRPI0822268A2/pt not_active IP Right Cessation
  • 2008-12-09 WO PCT/EP2008/010448 patent/WO2009100747A2/de active Application Filing
  • 2008-12-09 AU AU2008350648A patent/AU2008350648A1/en not_active Abandoned
  • 2008-12-09 MX MX2010008780A patent/MX2010008780A/es not_active Application Discontinuation
  • 2008-12-09 EP EP08872338A patent/EP2247902A2/de not_active Withdrawn

Non-Patent Citations (1)

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