A direct expansion evaporator includes an inner guiding duct defining a feeding channel for guiding raw material, and an outer guiding duct enclosing the inner guiding duct therewithin to form a heat exchange channel between the outer and inner guiding ducts for guiding refrigerant flowing along the
A direct expansion evaporator includes an inner guiding duct defining a feeding channel for guiding raw material, and an outer guiding duct enclosing the inner guiding duct therewithin to form a heat exchange channel between the outer and inner guiding ducts for guiding refrigerant flowing along the heat exchange channel to heat-exchange with the raw material along the feeding channel, wherein a helix indention is formed at the outer guiding duct to form the heat exchange channel partitioned by a helix partition, wherein a peak of the helix partition is biased against an outer surrounding wall of the inner guiding duct to conceal the heat exchange channel along the inner guiding duct in a weld-less manner.
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1. A direct expansion evaporator for making frozen product from raw material, comprising: a feeding channel having a feeding end and a dispensing end for said raw material feeding through said feeding channel; anda heat exchange channel thermally communicating with said feeding channel for guiding r
1. A direct expansion evaporator for making frozen product from raw material, comprising: a feeding channel having a feeding end and a dispensing end for said raw material feeding through said feeding channel; anda heat exchange channel thermally communicating with said feeding channel for guiding refrigerant passing through said heat exchange channel to heat-exchange with said raw material within said feeding channel, wherein said heat exchange channel has a pre-cooling portion formed toward said feeding end of said feeding channel and a freezing portion formed toward said dispensing end to thermally communicate with said feeding channel, wherein said feeding channel is arranged for guiding said raw material to flow from said pre-cooling portion of said heat exchange channel to said freezing portion so as to initially pre-cool said raw material when entering into said feeding end of said feeding channel and to substantially freeze said raw material to form said frozen product before said frozen product is dispensed at said dispensing end of said feeding channel, wherein a traveling path at said pre-cooling portion of said heat exchange channel is different from a traveling path of said freezing portion of said heat exchange channel, such that a traveling time of the refrigerant at said pre-cooling portion of said heat exchange channel is longer than a traveling time of the refrigerant at said freezing portion of said heat exchange channel. 2. The direct expansion evaporator, as recited in claim 1, further comprising an outer guiding duct and an inner guiding duct coaxially enclosed within said outer guiding duct to define said feeding channel within said inner guiding duct and said heat exchange channel between said outer and inner guiding ducts. 3. The direct expansion evaporator, as recited in claim 1, wherein said heat exchange channel has a helix path configuration defined at said pre-cooling portion and a straight forward path configuration defined at said freezing portion. 4. The direct expansion evaporator, as recited in claim 2, wherein said heat exchange channel has a helix path configuration defined at said pre-cooling portion and a straight forward path configuration defined at said freezing portion. 5. The direct expansion evaporator, as recited in claim 2, wherein a helix indention is formed at said outer guiding duct to form said heat exchange channel partitioned by a helix partition, wherein a peak of said helix partition is biased against an outer surrounding wall of said inner guiding duct to conceal said heat exchange channel along said inner guiding duct in a weld-less manner. 6. The direct expansion evaporator, as recited in claim 4, wherein a helix indention is formed at said outer guiding duct to form said heat exchange channel partitioned by a helix partition, wherein a peak of said helix partition is biased against an outer surrounding wall of said inner guiding duct to conceal said heat exchange channel along said inner guiding duct in a weld-less manner. 7. The direct expansion evaporator, as recited in claim 1, wherein a longitudinal length of said freezing portion of said heat exchange channel is shorter than a longitudinal length of said pre-cooling portion of said heat exchange channel. 8. The direct expansion evaporator, as recited in claim 1, wherein a feeding direction of said raw material along said feeding channel is opposite to a flowing direction of said refrigerant along said heat exchange channel. 9. The direct expansion evaporator, as recited in claim 1, wherein said traveling path of said heat exchange channel is long enough for phase-changing said refrigerant that said refrigerant is in liquid phase under a predetermined high pressure when entering into said heat exchanging channel and is in gaseous phase when exiting said heat exchanging channel. 10. A method of manufacturing a direct expansion evaporator for making frozen product from raw material, comprising the steps of: (a) configuring an inner guiding duct to define a feeding channel therewithin, wherein said feeding channel has a feeding end and a dispensing end for said raw material feeding through said feeding channel;(b) receiving said inner guiding duct within an outer guiding duct to form a heat exchange channel between said inner and outer guiding ducts to thermally communicate with said feeding channel;(c) configuring said heat exchange channel to form a pre-cooling portion being extended toward said feeding end of said feeding channel and a freezing portion being extended toward said dispensing end, wherein said heat exchange channel is configured by the step of:configuring different traveling paths at said pre-cooling portion and at said pre-cooling portion of said heat exchange channel to guide a flow of refrigerant from an inlet of said heat exchange channel to an outlet thereof, such that a traveling time of the refrigerant at said pre-cooling portion of said heat exchange channel is longer than a traveling time of the refrigerant at said freezing portion of said heat exchange channel; and(d) guiding said raw material and refrigerant passing through said feeding channel and said heat exchange channel respectively for heat-exchanging, wherein said raw material is initially pre-cooled at said pre-cooling portion of said heat exchange channel when entering into said feeding end of said feeding channel and is substantially frozen at said freezing portion of said heat exchange channel to form said frozen product before said frozen product is dispensed at said dispensing end of said feeding channel. 11. The method, as recited in claim 10, wherein the step (b) further comprises the steps of: (b.1) forming a helix indention at said outer guiding duct to form said heat exchange channel partitioned by a helix partition; and(b.2) slidably and coaxially inserting said inner guiding duct into said outer guiding duct, wherein a peak of said helix partition is biased against an outer surrounding wall of said inner guiding duct to conceal said heat exchange channel along said inner guiding duct in a weld-less manner. 12. The method as recited in claim 10 wherein, in the step (c), said heat exchange channel has a helix path configuration defined at said pre-cooling portion and a straight forward path configuration defined at said freezing portion. 13. The method as recited in claim 10 wherein, in the step (c), a longitudinal length of said freezing portion of said heat exchange channel is shorter than a longitudinal length of said pre-cooling portion of said heat exchange channel. 14. The method as recited in claim 13 wherein, in the step (c), a longitudinal width of said heat exchange channel at said dispensing end of said feeding channel is larger than a longitudinal width of said heat exchange channel at said feeding end of said feeding channel. 15. The method as recited in claim 10 wherein, in the step (d), a feeding direction of said raw material along said feeding channel is opposite to a flowing direction of said refrigerant along said heat exchange channel. 16. The method as recited in claim 10 wherein, in the step (b), said traveling path of said heat exchange channel is long enough for phase-changing said refrigerant that said refrigerant is in liquid phase under a predetermined high pressure when entering into said heat exchanging channel and is in gaseous phase when exiting said heat exchanging channel. 17. A direct expansion evaporator for making frozen product from raw material, comprising: an inner guiding duct defining a feeding channel therealong and having a feeding end and a dispensing end for guiding said raw material flowing along said feeding channel from said feeding end to said dispensing end; andan outer guiding duct, wherein said inner guiding duct is coaxially enclosed within said outer guiding duct to form a heat exchange channel between said outer and inner guiding ducts for guiding refrigerant flowing along said heat exchange channel from an inlet to an outlet thereof so as to heat-exchange with said raw material along said feeding channel, wherein a flat surface is partially formed at said outer guiding duct and a helix indention is partially formed at said outer guiding duct to form said heat exchange channel partitioned by a helix partition, wherein said heat exchange channel is arranged for guiding the refrigerant to flow from said flat surface to said helix indention, such that a traveling time of the refrigerant at said helix indention of said heat exchange channel is longer than a traveling time of the refrigerant at said flat surface of said heat exchange channel, wherein a peak of said helix partition is biased against an outer surrounding wall of said inner guiding duct to conceal said heat exchange channel along said inner guiding duct in a weld-less manner. 18. The direct expansion evaporator, as recited in claim 17, wherein said heat exchange channel has a helix path configuration defined at said helix indention of said heat exchange channel and a straight forward path configuration defined at said flat surface of said heat exchange channel. 19. The direct expansion evaporator, as recited in claim 17, wherein a feeding direction of said raw material along said feeding channel is opposite to a flowing direction of said refrigerant along said heat exchange channel. 20. The direct expansion evaporator, as recited in claim 17, wherein said traveling path of said heat exchange channel is long enough for phase-changing said refrigerant that said refrigerant is in liquid phase under a predetermined high pressure when entering into said heat exchanging channel and is in gaseous phase when exiting said heat exchanging channel.
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이 특허에 인용된 특허 (10)
Zevlakis, John, Commercial ice making apparatus and method.
Welch Daniel L. (Del Rio TX) Love Jeff L. (Leander TX), Method for reducing sediment precipitation on heat exchangers such as water prechillers for ice machines.
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