EP1649227A1 - Contact freezer - Google Patents
Contact freezerInfo
- Publication number
- EP1649227A1 EP1649227A1 EP04748981A EP04748981A EP1649227A1 EP 1649227 A1 EP1649227 A1 EP 1649227A1 EP 04748981 A EP04748981 A EP 04748981A EP 04748981 A EP04748981 A EP 04748981A EP 1649227 A1 EP1649227 A1 EP 1649227A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- conveyor belt
- metal sheet
- groups
- refrigerating unit
- inlets
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- F25D13/00—Stationary devices, e.g. cold-rooms
- F25D13/06—Stationary devices, e.g. cold-rooms with conveyors carrying articles to be cooled through the cooling space
- F25D13/062—Stationary devices, e.g. cold-rooms with conveyors carrying articles to be cooled through the cooling space with refrigerated conveyors
Definitions
- the present invention relates to a contact freezer for food products. More specifically, the invention concerns such a contact freezer for freezing a surface layer of the food products. The final freezing of the food products can then suitably take place in a freezer using convection cooling of cold air.
- the conveyor belt can be cooled indirectly by its underside at the cooling station contacting the upper side of a refrigerating unit which in turn is directly cooled in a suitable manner.
- a refrigerating unit which in turn is directly cooled in a suitable manner.
- This lubricating liquid reduces friction, which is otherwise increased due to the curvature, between the conveyor belt and the refrigerating unit, but it also causes the same problems as in the above case with direct cooling of the conveyor belt.
- Further embodiments of the refrigerating unit for a contact freezer are known from, inter alia, EP 0 759 529 A2, US-A-3,037,366, US-A-3, 528 , 257 , US-A-3, 584 , 471, US-A-4,205,536 and US-A-6, 009, 719.
- a common feature of the known refrigerating units is a relatively complicated and thus expensive construction which after all exhibits a limited degree of efficiency.
- the object of the present invention therefore is to provide an effective contact freezer of a simpler construction.
- the object is achieved by a contact freezer according to claim 1.
- the invention provides a contact freezer for food products of the type that comprises a conveyor belt and a refrigerating unit, which has an upper side in contact with part of an underside of the conveyor belt and is adapted to refrigerate food products positioned on the conveyor belt as they pass over the refrigerating unit, so that a layer of the food products next to the conveyor belt is transferred to a frozen state.
- This contact freezer according to the invention is charac- terised in that the conveyor belt consists of a flexible, non-metallic material, and the refrigerating unit comprises an upper metal sheet which is convexly curved in the travelling direction of the conveyor belt and which forms the upper side of the refrigerating unit with a surface which preferably consists of stainless steel in direct sliding contact with the conveyor belt during the movement thereof, a lower metal sheet which is arranged under the upper metal sheet with a gap thereto and which has a plurality of groups of inlets which are arranged alternately with a plurality of groups of outlets, sealing means for closing the gap round an area which com- prises the groups of inlets and the groups of outlets, and means for feeding a coolant in a closed loop which comprises the parts of the area which are connected in parallel and located between the groups of inlets and the groups of outlets, which are arranged alternately with the groups of inlets.
- the invention thus provides a simple refrigerating unit, which by the bending of the upper metal sheet, resulting in surface smoothness, and the use of a flexible, non-metallic conveyor belt gives sufficiently good heat transfer over the boundary layer between them, without requiring the use of some kind of contact-creating liquid.
- the refrigerating unit also exhibits highly efficient refrigeration through the division of the cooling area into a plurality of partial areas to which the coolant is supplied in parallel, so that the difference between the maximum and minimum temperatures of the coolant in the total cooling area can be kept relatively small .
- a cold-rolled sheet of stainless steel particularly of austenitic, molybdenum-alloyed steel, such as Sandvik 1200 SA. It is essential for the surface smoothness that the material of the metal sheet should be resilient, which is the case with cold-rolled sheet. It is required that the upper metal sheet have good surface smoothness and also good thermal conductivity. This can also be achieved with a metal sheet of, for instance, aluminium or an aluminium alloy, but also with a laminated metal sheet having a lower layer with excellent thermal conductivity and an upper layer with good wear properties and good sanitary properties.
- each group of inlets and each group of outlets comprise a plurality of openings arranged transversely to the travelling direction of the conveyor belt. This ensures sub- stantially uniform cooling of the carrying surface of the conveyor belt and, thus, of the food products on the conveyor belt over the entire width thereof.
- Spacers are suitably arranged to determine the size of the gap and, in the preferred embodiment, they may comprise elements which are extended in the travelling direction of the conveyor belt and arranged between the upper metal sheet and the lower metal sheet. This ensures a substantially constant gap size over the entire area of the gap, which is essential for good distribution of the coolant flow.
- the size of the gap and the thickness of the upper metal sheet can be in the order of 1 mm, while the lower metal sheet can have a thickness of about 2 mm.
- the upper and lower metal sheets are preferably supported by two supports extended in the travelling direc- tion of the belt and having a convex profile, which abut against the lower metal sheet at the lateral edges thereof.
- the vessel can be supported in a stand, in which a first guide roller for the conveyor belt is mounted at a feed end of the refrigerating unit, and a second guide roller for the conveyor belt is mounted at a discharge end of the refrigerating unit.
- a third guide roller is mounted under the refrige- rating unit.
- condensation may form on the non-product-carrying surface of the conveyor belt after passing the guide roller at the discharge end, a drying device for this surface is also suitably arranged along the return run of the conveyor belt between the* discharge end and the feed end.
- Fig. 1 is a schematic side view of the exemplary embodiment.
- Fig. 2 is a cross-sectional view along line II-II in Fig. 1 through a refrigerating unit included in the exemplary embodiment.
- Fig. 3 is a cross-sectional view along line III-III in Fig. 2 through the refrigerating unit.
- Fig. 4 is a top plan view of a carrier sheet shown in Fig. 3.
- Fig. 5 shows part of a cross-sectional view on a larger scale along line V-V in Fig. 3 through part of the refrigerating unit.
- Fig. 6 is a cross-sectional view along line VI-VI in Fig. 3 through part of the refrigerating unit.
- Fig. 7 is a partial view on a larger scale of the right end of the refrigerating unit shown in Fig. 3.
- Fig. 8 shows schematically how the cooling of the refrigerating unit can be performed.
- a contact freezer shown in Fig. 1 comprises a stand
- the guide roller 4 is more specifically arranged at a feed end of the contact freezer and constitutes the drive roller for the conveyor belt 3, the guide roller
- the guide roller 5 is arranged at a discharge end of the contact freezer, and the guide roller 6 is arranged under the refrigerating unit 2.
- the motor for the drive roller can be arranged in the same or drive, in a conventional way, by pulleys using a drive belt (not shown) .
- the guide roller 5 arranged at the discharge end of the contact freezer suitably has a much smaller diameter than the guide roller 4, thus allowing the products on the conveyor belt 3 to easily leave the same at the discharge end.
- the guide roller 6 is mounted in arms 7 which in turn are pivotally mounted in the stand 1 in such a manner that the weight of the guide roller
- the guide roller 6 will tension the conveyor belt 3 in its path. If necessary, the belt tension of the conveyor belt 3 can be further increased by yet another force, for instance generated by a spring, being applied to the arms 7. Since the guide roller 6 is pivotally mounted in the stand 1, the conveyor belt 3 can easily be removed, for instance to be exchanged, by pivoting the guide roller 6 upwards. The belt tension is then released, thus allowing the conveyor belt 3 to be removed from the guide rollers 4 and 5 by lateral displacement. In some cases, a conveyor belt passed over guide rollers may tend to move in the lateral direction. The guide roller 6 can then be used to guide the conveyor belt 3. Sensor means (not shown) can in this case be arranged to detect any lateral deviation of the conveyor belt.
- the refrigerating unit 2 is shown in more detail in Figs 2-7. It comprises a vessel 8 and a cooling sheet 9 which forms a lid for the vessel 8, and liquid pipes 10 and 11 for supplying coolant to the refrigerating unit 2 and discharging used coolant from the refrigerating unit 2.
- the vessel 8 may comprise a varying amount of coolant and thus eliminates the need for a special expansion vessel.
- the coolant can advantageously be a brine with a temperature of about -50°C for instance, which is circulated in a closed loop between the secondary side of a heat exchanger and the refrigerating unit 2, the primary side of the heat exchanger being cooled in a suitable manner by means of a refrigerator connected thereto, as schematically shown in Fig. 8.
- a pump 52 used for circulating the coolant is arranged immediately after the refrigerating unit 2 in the closed loop, since this gives the lowest cooling temperature in the refrigerating unit 2 for a given evaporation temperature in the refrigerator.
- the vessel 8 has double walls 12 and 13, preferably of stainless steel, with an intermediate insulation 14 in the bottom 15 and also in the side walls 16, 17 and in the end walls 18, 19.
- the bottom 15 slopes towards a centrally arranged opening 20, which connects to the liquid pipe 11 for discharge of used brine back to the heat exchanger. Centrally in the bottom 15 there is also a tight lead-through 21 for the liquid pipe 10 for sup- plying brine from the heat exchanger.
- the vessel 8 is supported and fixed to the stand 1 by means of four supports 22 on its underside.
- a rail 23 is fixed by a plurality of brackets 24 and 25 at a distance from the inside of the side wall 16 and extends along the side wall 16 practically all the way to the end walls 18 and 19. As is evident from Figs 3 and 7, it has a convex upper edge 26.
- a corresponding rail 27 is in the same way fixed by a plurality of brackets 28 and 29 at a distance from the inside of the side wall 17. Additional rails of this type can be arranged between the rails 23 and 27.
- the convexity of the rails 23, 27 can correspond to a curvature of 0.5-6% per unit of length, and still more preferred a curvature of 1-3% per unit of length.
- the cooling sheet 9 rests along its lateral edges on the rails 23, 27 and is kept fixed to them by means of screws 30 which through holes 31 in the cooling sheet 9 are inserted in threaded holes 32 in the brackets 24 and 28 respectively.
- the screws 30 do not engage the upper side of the cooling sheet 9 directly with their heads, but by the intermediary of a flat strip 33. Furthermore the holes 31 have a larger diameter than the screws 30 so as to allow lateral movement of the cooling sheet in case of changes in temperature.
- the actual cooling sheet 9 consists of an upper metal sheet 34 and a lower metal sheet 35, between which a gap 36 forms by a plurality of elongate spacers 37 being arranged between the metal sheets 34 and 35.
- the elongate spacers 37 extend mainly in the travelling direction of the conveyor belt 3 over the cooling sheet 9 and are thus arranged with interspaces transversely to the travelling direction of the conveyor belt 3. As shown in Fig.
- the upper metal sheet 34 is bent downwards adjacent to the end wall 18 of the vessel 8 and is there fixed and sealed against a flange 38 of the end wall 18.
- the gap 36 is outwardly laterally defined by a seal 39 which extends in an endless manner along and inside the periphery of the cooling sheet 9, as is evident from Figs 5 and 7, and is pressed together between the metal sheets 34 and 35 when tightening the screws 30.
- the lower metal sheet 35 has five groups of inlets 40, each group consisting of a plurality of openings arranged in a row transversely to the travelling direction of the conveyor belt 3 and inside the seal 39 over the entire width of the lower metal sheet 35.
- each group of inlets 40 is arranged alternately with six groups of outlets 41, where each group also consists of a plurality of openings arranged in a row transversely to the travelling direction of the conveyor belt 3 and inside the seal 39 over the entire width of the lower metal sheet 35.
- a group of outlets 41 is positioned next to the seal 39 adjacent to each end wall 18 and 19 respectively of the vessel 8.
- a collecting pipe 42-46 is formed by a cup which is sealingly fixed to the underside of the lower metal sheet 35, and the collecting pipes 42-46 are interconnected by means of connecting pipes 47-50.
- the liquid pipe 10 finally opens in the middle collecting pipe 44.
- the parts 1, 7, 10-13, 15-19, 21-25, 27-30, 33-35, 38 and 42-50 are preferably made of stainless steel, and the fixed connections between them are suitably provided by welding.
- the upper metal sheet 34 and also the gap 36 can have a thickness of about 1 mm, while the thickness of the lower metal sheet 35 can be about 2 mm.
- the spacers 37 may consist of stain- less steel wire with a diameter of 1 mm.
- the seal may consist of an O-ring wire with a diameter of at least 1.5 mm.
- the fastening of the metal sheets 34, 35 be such that their linear expansion is not prevented in the plane of their own in case of a temperature change of the metal sheets from ambient temperature (usually room temperature) down to operating temperature (for instance -50°C) or vice versa.
- the inlets 40 may have a diameter of about 2 mm, while the outlets may have a greater diameter of about 10 mm. The number of inlets and the number of outlets are then determined so that the pressure of the coolant at the outlets is atmospheric pressure and the greatest pressure drop occurs at the inlets. It goes without saying that this can be achieved by different combinations of the numbers and diameters of the respective openings.
- the conveyor belt 3 is preferably a plastic-coated matrix, where the matrix can be a fabric reinforcement and the plastic some kind of silicone polymer or PTFE, for instance of the type Teflon ® . Its thickness is pre- ferably in the range of 0.1-0.3 mm.
- the conveyor belt 3 is shown as an endless belt, the invention can also be applied to a belt with a finite length.
- a drying device 51 for the non-product- carrying surface of the conveyor belt 3 is arranged directly adjacent to the second guide roller 5 at the discharge end, so as to eliminate the condensation that may form on this surface of the conveyor belt 3 when the conveyor belt leaves the refrigerating unit 2.
- the drying device 51 may consist of a means for blowing of hot air, an electric plate heater or some other suitable means.
- the inventive contact freezer comprises a casing for covering the conveyor belt 3 when passed over the upper side of the refrigerating unit. The casing is arranged at a suitable distance above the conveyor belt to make room for products that are being frozen.
- the casing which is easy to remove to allow good access and good sanitary conditions, increases the freezing capacity of the contact freezer since the upper side of the re rigerating unit is not freely exposed to the environment.
- the air enclosed in the casing will be cooled and will thus contribute to cooling of the products.
Landscapes
- 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)
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Structure Of Belt Conveyors (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Table Equipment (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL04748981T PL1649227T3 (en) | 2003-07-02 | 2004-06-11 | Contact freezer |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0301948A SE525486C2 (en) | 2003-07-02 | 2003-07-02 | A contact |
PCT/SE2004/000903 WO2005003657A1 (en) | 2003-07-02 | 2004-06-11 | Contact freezer |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1649227A1 true EP1649227A1 (en) | 2006-04-26 |
EP1649227B1 EP1649227B1 (en) | 2010-01-13 |
Family
ID=27731076
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04748981A Expired - Lifetime EP1649227B1 (en) | 2003-07-02 | 2004-06-11 | Contact freezer |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP1649227B1 (en) |
AT (1) | ATE455282T1 (en) |
CL (1) | CL2004001652A1 (en) |
DE (1) | DE602004025115D1 (en) |
DK (1) | DK1649227T3 (en) |
ES (1) | ES2336210T3 (en) |
PL (1) | PL1649227T3 (en) |
SE (1) | SE525486C2 (en) |
WO (1) | WO2005003657A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004020193A1 (en) | 2004-04-22 | 2005-11-17 | Linde Ag | Device for cooling and / or freezing products |
CN109724366B (en) * | 2017-10-30 | 2021-08-06 | 楚天科技股份有限公司 | Automatic feeding and discharging method for air cooling cabinet |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2610476A (en) * | 1940-08-15 | 1952-09-16 | Flakice Corp | Art of congelation and apparatus for use in connection therewith |
DK68543C (en) * | 1944-03-25 | 1949-02-14 | Sandvikens Jernverks Ab | Method and apparatus for transferring heat to or from material carried by a thin, endless conveyor belt. |
DE1132941B (en) * | 1957-03-06 | 1962-07-12 | Flakice Corp | Plant for freezing substances |
US3068989A (en) * | 1959-04-03 | 1962-12-18 | Baker Perkins Ltd | Apparatus for handling substantially flat articles |
US3584471A (en) * | 1969-08-15 | 1971-06-15 | Pennwalt Corp | Continuous freezing apparatus including cooling platen |
US3664149A (en) * | 1970-10-26 | 1972-05-23 | Frick Co | Controlled refrigeration application to a metallic conveyor belt |
US4205536A (en) * | 1977-03-01 | 1980-06-03 | Kabushiki Kaisha Maekawa Seisakusho | Refrigerating apparatus |
-
2003
- 2003-07-02 SE SE0301948A patent/SE525486C2/en not_active IP Right Cessation
-
2004
- 2004-06-11 AT AT04748981T patent/ATE455282T1/en not_active IP Right Cessation
- 2004-06-11 ES ES04748981T patent/ES2336210T3/en not_active Expired - Lifetime
- 2004-06-11 DK DK04748981.0T patent/DK1649227T3/en active
- 2004-06-11 PL PL04748981T patent/PL1649227T3/en unknown
- 2004-06-11 WO PCT/SE2004/000903 patent/WO2005003657A1/en active Application Filing
- 2004-06-11 EP EP04748981A patent/EP1649227B1/en not_active Expired - Lifetime
- 2004-06-11 DE DE602004025115T patent/DE602004025115D1/en not_active Expired - Lifetime
- 2004-06-29 CL CL200401652A patent/CL2004001652A1/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2005003657A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE455282T1 (en) | 2010-01-15 |
SE0301948D0 (en) | 2003-07-02 |
WO2005003657A1 (en) | 2005-01-13 |
ES2336210T3 (en) | 2010-04-09 |
DK1649227T3 (en) | 2010-05-03 |
PL1649227T3 (en) | 2010-06-30 |
CL2004001652A1 (en) | 2005-06-03 |
DE602004025115D1 (en) | 2010-03-04 |
SE0301948L (en) | 2005-01-03 |
EP1649227B1 (en) | 2010-01-13 |
SE525486C2 (en) | 2005-03-01 |
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