EP3736521B1 - Heat exchange tube, heat exchanger and heat pump unit - Google Patents
Heat exchange tube, heat exchanger and heat pump unit Download PDFInfo
- Publication number
- EP3736521B1 EP3736521B1 EP18917408.9A EP18917408A EP3736521B1 EP 3736521 B1 EP3736521 B1 EP 3736521B1 EP 18917408 A EP18917408 A EP 18917408A EP 3736521 B1 EP3736521 B1 EP 3736521B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fin
- heat exchange
- tube body
- exchange tube
- saw
- 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.)
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- 239000003507 refrigerant Substances 0.000 description 44
- 238000001704 evaporation Methods 0.000 description 27
- 230000008020 evaporation Effects 0.000 description 27
- 238000009833 condensation Methods 0.000 description 25
- 230000005494 condensation Effects 0.000 description 25
- 239000007788 liquid Substances 0.000 description 24
- 230000009286 beneficial effect Effects 0.000 description 11
- 230000002708 enhancing effect Effects 0.000 description 9
- 238000009834 vaporization Methods 0.000 description 8
- 230000008016 vaporization Effects 0.000 description 8
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- 238000004891 communication Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
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- 239000011555 saturated liquid Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
- F28F1/422—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element with outside means integral with the tubular element and inside means integral with the tubular element
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
-
- 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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/006—Tubular elements; Assemblies of tubular elements with variable shape, e.g. with modified tube ends, with different geometrical features
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
- F28F1/26—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means being integral with the element
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
- F28F1/424—Means comprising outside portions integral with inside portions
- F28F1/426—Means comprising outside portions integral with inside portions the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/18—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
- F28F13/185—Heat-exchange surfaces provided with microstructures or with porous coatings
- F28F13/187—Heat-exchange surfaces provided with microstructures or with porous coatings especially adapted for evaporator surfaces or condenser surfaces, e.g. with nucleation sites
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
- F28D2021/007—Condensers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
- F28D2021/0071—Evaporators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2215/00—Fins
- F28F2215/10—Secondary fins, e.g. projections or recesses on main fins
Definitions
- the present invention relates to the field of air conditioning, and in particular, relates to a heat exchange tube, a heat exchanger and a heat pump unit.
- the present invention relates to a heat exchange tube as defined in the preamble of claim 1, and as illustrated in DE 33 322 82 .
- the heat exchanger for the flooded heat pump unit is divided into a flooded evaporator and a flooded condenser, which are two heat exchangers with different structural forms.
- the heat exchange tube as a core component of the flooded heat exchanger, is also divided into a flooded evaporation tube and a flooded condenser tube.
- DE 3332282A1 relates to a heat transfer pipe, including a cylindrical heat transfer pipe body and a plurality of circumferential or spiral fins integrally formed on the outer surface of the pipe body, the upper portion of each of the fins having one or more circumferential grooves to divide it circumferentially into at least two parts and a plurality of axially extending breaks to divide it axially into a number of parts.
- the fins further may have notches formed therein with a predetermined pitch in a direction crossing the fins to divide them into a plurality sections, and a plurality of discrete beads are integrally formed on the inner surface of the body along imaginary lines having a lead angle which is in reverse relation to the lead angle of the fins, the beads being formed on at least some of the intersections between the imaginary lines and the fins.
- the present invention is defined in claim 1.
- the fins are arranged on the outer surface of the tube body spirally or in parallel, a channel is formed between two adjacent fins, and a gap is formed between adjacent transverse fin parts in the channel.
- the fins are arranged on the outer surface of the tube body spirally or in parallel, a channel is formed between two adjacent fins (20), and the transverse fin part divides the channel into an outer cavity and an inner cavity, the inner cavity is close to the outer surface of the tube body relative to the outer cavity.
- a first groove is disposed on a wall surface of the inner cavity.
- the first groove is formed on the outer surface of the tube body.
- a cross section of the first groove is I-shaped, cross-shaped, X-shaped, U-shaped, triangular or polygonal with more than three sides.
- the transverse fin part is constructed as a curved shape, or a surface of the transverse fin part is constructed as a curved shape.
- the transverse fin part is provided with a plurality of slits, at least one of the slits extends to one concave portion of the saw-toothed part.
- each of the slits is correspondingly connected to one corresponding concave portion of the saw-toothed part.
- the transverse fin parts disposed on two sides of the fin root part symmetrically incline towards the outer surface of the tube body.
- a cross section of a convex portion of the saw-toothed part is trapezoidal, triangular or rectangular and is roughly vertical to an axis of the tube body.
- a cross section of a convex portion of the saw-toothed part is rectangular, parallelogram-shaped or trapezoidal and is roughly parallel with an axis of the tube body.
- a cross section of concave portion of the saw-toothed part is trapezoidal, triangular or rectangular.
- At least one of a spine and a second groove is arranged on at least one side of the fin top part.
- the fin is arranged on the outer surface of the tube body spirally, there are 40 to 95 convex portions of the saw-toothed part disposed in a segment of the fin on a circumference of the tube body.
- an inner surface of the tube body is provided with a thread, an included angle between a tangent line of the thread and an axis line of the tube body is 15° to 65°.
- Some embodiments of the present disclosure provide a heat exchanger, including the above described heat exchange tube.
- Some embodiments of the present disclosure provide a heat pump unit, including the above described heat exchanger.
- the heat pump unit is a flooded heat pump unit.
- the saw-toothed fin top part is favorable for refrigerant flowing, thereby enhancing condensation property; and the transverse fin part extends laterally from the two sides of the fin to form a lower layer of channel and an upper layer of channel beneficial to evaporation and condensation, such that the heat exchange tube has both evaporation and condensation properties.
- an azimuth or position relationship indicated by terms “center”, “longitudinal”, “transverse”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like is an azimuth or position relationship based on the accompanying draws, which is only for facilitating description of the present disclosure and simplifying description, but not indicates or implies that the referred device or component must have a specific azimuth and perform construction and operation in the specific azimuth; therefore, it cannot be interpreted as a limitation to the protection scope of the present disclosure.
- One of the objectives of some embodiments of the present invention is to provide a heat exchange tube with evaporation and condensation functions, a heat exchanger and a heat pump unit.
- the heat exchange tube includes a tube body 10, wherein the tube body 10 includes an unprocessed smooth section 11, a fin-forming section 13 completely forming a fin along a circumference, and a transition section 12 between the smooth section 11 and the fin-forming section 13.
- the smooth section 11 is used to perform expanded connection and sealing between a shell tube and the heat exchange tube.
- the heat exchange tube maintains a vibration state for a long time when operating in a unit, and the transition section 12 is used to enhance the strength of the heat exchange tube.
- An outer diameter of the transition section 12 is less than that of the smooth section 11.
- the heat exchange tube includes a tube body 10 and a fin 20 arranged on an outer surface of the tube body 10.
- the fin 20 is arranged on a fin-forming section 13 of the tube body 10.
- the fin 20 is a spiral fin and is spirally arranged on the tube body 10 along an axial direction of the tube body 10.
- the fin 20 includes a plurality of annular fins, wherein each of the annular fins is arranged along a circumferential direction of the tube body 10, and all the annular fins are arranged at intervals along an axial direction of the tube body 10. Further, all the annular fins are arranged in parallel.
- the fin 20 includes a plurality of linear fins, wherein a length direction of each of the linear fins is consistent with an axial direction of the tube body 10, and all the linear fins are arranged at intervals along a circumferential direction of the tube body 10. Further, all the linear fins are arranged in parallel.
- the fin 20 includes a fin root part 23, a transverse fine portion 21 and a fin top part 22.
- the fin root part 23 is arranged on an outer surface of the tube body 10.
- the transverse fin part 21 is arranged on the top of the fin root part 23 and extends laterally from two sides of the fin root part 23. A part below the transverse fin part 21, the fin root part 23 and the outer surface of the tube body 10 form a space beneficial to improving evaporation property.
- the fin top part 22 is arranged on the top of the transverse fin part 21 and is constructed as a saw-toothed part; a concave portion of the saw-toothed part of the fin top part 22 extends to the transverse fin part 21 and is adapted to enlarging the heat exchange area of the fin top part 22 and thinning a liquid film; and the saw-toothed fin top part 22 is favorable for refrigerant flowing, thereby improving condensation property.
- a thickness of the fin top part 22 is less than that of the fin root part 22, which is beneficial to forming a sharp edge on the fin top part 22, thereby piercing a gaseous refrigerant carrying liquid.
- the fin top part 22 is formed by extruding the top of the fin 20, a thickness of the fin top part 22 is less than that of the fin root part 23, and the transverse fin part 21 extends laterally from the two sides of the fin 20 relative to the fin root part 23 and the fin top part 22.
- the fin top part 22 is constructed as a saw-toothed part, a concave portion of the saw-toothed part extends to the transverse fin part 21 and the transverse fin part 21 extends laterally from the two sides of the fin 20.
- the structure has both evaporation and condensation properties, thereby relieving the problem of property attenuation when the conventional condenser tube serves as an evaporation tube and relieving the problem of property attenuation when the conventional evaporation tube serves as a condenser tube.
- the fins 20 are arranged on an outer surface of the tube body 10 spirally or in parallel, a channel is formed among spiral body of the fin, or a channel is formed between two adjacent fins of the plurality of fins, and a gap 26 is formed between two adjacent transverse fin parts 21 in the channels.
- a gap 26 is formed between two adjacent transverse fin parts 21 in the channel along an extending direction of the transverse fin part 2.
- an overlapped section is arranged between two adjacent transverse fin parts 21 in the channel along an extending direction of the transverse fin part 2, and a gap 26 is disposed in a space of the adjacent transverse fin parts 21 in a height direction of the fin. Further, one of the transverse fin parts 21 is higher than the adjacent transverse fin part 21 in the height direction of the fin. Or a tail end (the overlapped section position) of one of the transverse fin parts 21 is higher than a tail end (the overlapped section position) of the adjacent transverse fin part 21 in the height direction of the fin.
- a gap 26 is formed between the adjacent transverse fin parts 21 in the channel, and a upper layer of the channel is fluid communication with a lower layer of the channel, among the two adjacent fins 20, such that it is beneficial to circulation of a liquid refrigerant and the condensation effect is enhanced; furthermore, when the refrigerant is evaporated, supplementation of the refrigerant and discharge of a gaseous refrigerant are benefited, and the evaporation function is enhanced; and the evaporation and condensation properties are not attenuated.
- the fins 20 are arranged on an outer surface of the tube body 10 spirally or in parallel, the transverse fin part 21 divides a channel formed between the two adjacent fins 20 into an outer cavity 24 and an inner cavity 25, and the inner cavity 25 is close to the outer surface of the tube body 10 relative to the outer cavity 24.
- the transverse fin part 21 divides the channel formed between the two adjacent fins 20 into an outer cavity 24 and an inner cavity 25.
- a gap 26 is formed between the adjacent transverse fin parts 21 in the channel, which is beneficial to ensuring escape of evaporative bubbles formed by the lower layer of the channel with evaporation function and is favorable for discharging of a liquid refrigerant during condensation of the refrigerant.
- the inner cavity 25 is surrounded by the transverse fin part 21, the fin root part 23 and the outer surface of the tube body 10 and principally forms a small cavity favorable for evaporation by mainly adopting a nucleate boiling principle.
- the outer cavity 25 is surrounded by the transverse fin part 21 and the fin top part 22, and mainly enlarges the heat exchange area and thins a liquid film to facilitate condensation. Therefore, the evaporation and condensation properties are not attenuated.
- a first groove 251 is disposed on a wall surface of the inner cavity 25, which enables an inner surface of the inner cavity 25 to be rough and is beneficial to forming a vaporization core required by evaporation, thereby enhancing evaporative heat exchange.
- the first groove 251 is disposed on an outer surface of the tube body 10.
- a secondary refrigerant is introduced into the tube body 10 and is used to exchange heat with a refrigerant outside the tube body 10, and the first groove 251 is disposed on the outer surface of the tube body 10, it is benefit to forming a vaporization core on the outer surface of the tube body 10 and enhancing evaporative heat exchange; and the heat exchange area is increased on the basis of the outer surface of the original smooth tube body 10.
- a plurality of first grooves 251 are disposed on the outer surface of the tube body 10 along a direction of channel among two adjacent fins 20.
- the outer surface of the tube body 10 is barreled and flattened by a smooth barreling wheel, such that a multi-pit surface structure is formed on the outer surface of the tube body 10, thereby providing a vaporization core required by evaporation and enhancing evaporative heat exchange.
- the first groove 251 is disposed on a surface of the fin root part 23, which is beneficial to forming a vaporization core. Further, the first groove 251 is arranged along a height direction of the fin root part 23 so as to facilitate flowing of a refrigerant along the first groove 251.
- a cross section of the first groove 251 is I-shaped, cross-shaped, X-shaped, U-shaped, round, triangular, quadrangular, polygonal (more than four sides), or of other irregular or regular shapes.
- the inner cavity 25 is provided with a plurality of first grooves 251.
- the uneven structure is beneficial to increasing the roughness of the inner cavity 25, forming a vaporization core and enhancing the evaporation function.
- the transverse fin part 21 is constructed as a curved shape, or a surface of the transverse fin part 21 is formed as a curved shape.
- a body or surface of the transverse fin part 21 is constructed as a curved shape, which is beneficial to enlarging the heat exchange area and thinning a liquid film and facilitates flowing of a refrigerant.
- the transverse fin part 21 is provided with a slit 211 favorable for fluid to pass through, thereby facilitating supplementation of a refrigerant and escape of evaporative bubbles.
- the transverse fin part 21 is provided with a plurality of slits 211, each of the slits 211 correspondingly extends to one corresponding concave portion of the saw-toothed part of the fin top part 22. Arranging the slits 211 facilitates flowing of the refrigerant; furthermore, the slits 211 extend to the concave portions of the fin top part 22, thereby facilitating flowing of the refrigerant to the inner cavity 25.
- the slit 211 is long strip-shaped and extend along an extending direction of the transverse fin part 21.
- the transverse fin part 21 is provided with a plurality of round, triangular, square, or polygonal (more than four sides), or other regular or irregular through holes, thereby facilitating flowing of a refrigerant to the inner cavity 25 or discharge of a gaseous refrigerant.
- the transverse fin part 21 at least disposed on one side of the fin root part 23 inclines towards the outer surface of the tube body 10, thereby facilitating flowing of a refrigerant to the inner cavity 25.
- the transverse fin parts 21 disposed on two sides of the fin root part 23 symmetrically incline towards the outer surface of the tube body 10, and a cross section of the fin root part 23 combined with the transverse fin parts 21 on two sides of the top of the fin root part 23 is similarly shaped like an umbrella (as shown in FIG. 6 ), thereby facilitating flowing of a refrigerant to the inner cavity 25.
- the transverse fin parts 21 disposed on two sides of the fin root part 23 are arranged horizontally.
- a first cross section of a convex portion of the saw-toothed part of the fin top part 22 is trapezoidal, triangular or rectangular and is roughly vertical to an axis of the tube body 10.
- a second cross section of a convex portion of the saw-toothed part of the fin top part 22 is rectangular, parallelogram-shaped or trapezoidal and is roughly parallel with an axis of the tube body 10. As shown in FIG. 5 , ⁇ 1 is 90 degrees when the second cross section is rectangular, or ⁇ 1 is an acute angle or an obtuse angle when the second cross section is parallelogram-shaped or trapezoidal.
- a concave portion of the saw-toothed fin top part 22 is trapezoidal, triangular or rectangular.
- the fin top part 22 is provided with at least one of a spine 221 (as shown in FIG. 6 ) and a second groove 222 (as shown in FIG. 7 ).
- the spine 221 is arranged on at least one side of the fin top part 22 and is adapted to enlarge the heat exchange area of the fin top part 22, such that it is beneficial to piercing a liquid film and accelerating discharge of condensed liquid.
- a second groove 222 is disposed on at least one side of the fin top part 22 and is adapted to enlarge the heat exchange area of the fin top part 22, thereby thinning a liquid film and enhancing condensation property. Further, the second grooves 222 are disposed on two sides of the fin top part 22, or disposed at the top of the fin top part 22.
- the fin 20 is arranged on the outer surface of the tube body (10) spirally, there are 40 to 95 convex portions of the saw-toothed fin top part 22 in a segment of the fin 20 on a circumference of the tube body 10.
- a plurality of slits is arranged at the transverse fin part 21, and each of the slits 211 extends correspondingly to a corresponding concave portion of the saw-toothed fin top part 22, and the number of slits is 40 to 95, thereby enhancing evaporation effect and facilitating supplementation of a refrigerant and discharge of a gaseous refrigerant.
- an inner surface of the tube body 10 is provided with a thread 14 while an outer surface of the tube body 10 is enhanced; an included angle ⁇ 2 between a tangent line of the thread 14 and an axis line of the tube body 10 is 15° to 65° (as shown in FIG. 3 ), that is, a spiral angle ⁇ 2 is 15° to 65°; and the thread is adapted to increase a disturbance intensity of a secondary refrigerant side, and the heat exchange area is increased by increasing the spiral angle.
- a plurality of threads 14 are distributed on an inner side of the tube body 10 uniformly along a circumferential direction, wherein the number n of the threads is equal to 30 to 65. Increment of the threads is mainly adapted to enlarge the heat exchange area and improve a disturbance intensity of a secondary refrigerant on an inner side, thereby enhancing heat exchange of the inner side.
- an inner side of the tube body 10 is rolled by a grooved lining core to form a spirally protruded internal thread structure.
- the fins 20 are distributed along a surface of the tube body 10 in a single-head spiral manner; and due to single spiral distribution, the fins are formed more uniformly and have higher consistency.
- a bottom of the convex portion of the saw-toothed fin top part 22 is crack-shaped, thereby facilitating processing and refrigerant flowing.
- the fin 20 on the heat exchange tube is processed by a special fin rolling mill and is rolled by cutter combination and a lining core grooving mold and by an extrusion forming scrapless processing process, wherein both sides are strengthened simultaneously.
- a refrigerant side of the heat exchange tube has higher requirement on cleanliness, copper scraps are avoided by extrusion forming scrapless processing.
- the strength is higher.
- a width h 1 of a channel formed between the fins is 0.254 mm to 0.558 mm, the condensation effect of the upper layer is taken into consideration. If the gap is too small, the lower layer of evaporation cavity is liable to block and the condensed liquid of the upper layer is unfavorable for discharging, thereby reducing the condensation effect.
- a thickness h 2 of the fin 20 is 0.15 mm to 0.305 mm. If the fin 20 is too thin, it is unfavorable for rolling two sides of the fin 20 to form a transverse fin part 21; and if the fin 20 is too thick, the fin 20 extends to the two sides to enable a cavity to be small, even to be congested, which is unfavorable for deformation of an evaporation cavity.
- a tube body 10 with an outer diameter of 19.05 mm and a wall thickness of 1.15 mm is processed.
- a certain spirally protruded structure (fin 20) is extruded by a combined mold, the extruded protruded structured is rolled by cutter combination, and saw-toothed parts are formed on the fin top part 22.
- the surface area of the heat exchange tube is increased, a rough and uneven outer surface is formed by knurling and movement of condensation is promoted; and second, a thickness of a refrigerant liquid film is reduced. Meanwhile, due to deformation caused by processing, a natural crack is formed at the bottom of the saw-toothed fin top part 22.
- Two sides of the fin are extruded to form a transverse fin part 21 extending into a fin groove while the spiral fin is extruded. Meanwhile, a gasket of 0.1 mm is placed between the adjacent transverse fin parts 21 to form a gap 26, and liquid is discharged by channels among the fins, thereby enhancing the condensation effect.
- the top of the fin is extruded to form a saw-toothed part, and a slit 211 is naturally formed while the fin is extruded to extend into a groove (the two sides of the fin).
- a working principle of the heat exchange tube is as follows.
- the heat exchange tube serves as an evaporation tube under a working condition of refrigeration: a liquid refrigerant on an outer side of the tube body 10 is mainly evaporated in the inner cavity 25; firstly, the liquid refrigerant enters into the inner cavity 25 through at least one of the gap 26 and the slit 211 from the outer cavity 24, the surface temperature of the tube body 10 at the bottom of the inner cavity 25 is high and has superheat degree required for evaporation; meanwhile, the surface of the tube body 10 at the bottom of the inner cavity 25 is provided with a plurality of first grooves 251, thereby increasing the roughness of the fin root part and forming a large number of vaporization cores on the fin root part; the saturated liquid refrigerant is evaporated in the inner cavity 25 with a certain superheat degree and a large number of vaporization cores, a large number of bubbles generated by evaporation is discharged through at least one of the gap 26 and the slit 211; and meanwhile, the liquid refrigerant in the
- the heat exchange tube serves as a condenser tube under a working condition of heating: a high-pressure gaseous refrigerant on an outer side of the tube is mainly condensed in the outer cavity 24, and the saw-toothed fin top part 22 on the fin 20 is formed by extrusion, such that two sides of the convex portion of the fin top part 22 are sharp, refrigerant bubbles are pierced and the gaseous refrigerant is rapidly condensed into liquid.
- the concave portion of the fin top part 22 and the transverse fin part 21 inclining towards an outer surface of the tube body 10 significantly increase the surface area of the outer cavity 24, which is especially favorable for condensation and heat exchange of the gaseous refrigerant.
- the liquid refrigerant generated on the transverse fin part 21 by condensation flows downwards under the comprehensive action of a surface tension or a gravity force of the liquid refrigerant and is discharged into the inner cavity 25 timely through at least one of the gap 26 and the slit 211 to be further cooled. Due to circumferential communication of the inner cavity 25, a certain amount of liquid refrigerant which is accumulated finally is discharged out of a surface of the heat exchange tube through the bottom of the heat exchange tube.
- Some embodiments provide a heat exchanger, including the above described heat exchange tube.
- Some embodiments provide a heat pump unit, including the above described heat exchanger. By adoption of the above described heat exchanger, energy efficiency of the heat pump unit is improved.
- the heat pump unit is a flooded heat pump unit.
- the condensation process is to convert a gaseous refrigerant into a liquid refrigerant, thin a liquid film as much as possible and discharge the liquid refrigerant timely, such that the condensation process operates continuously and efficiently, otherwise, the condensation property will be attenuated.
- the evaporation process is to convert a liquid refrigerant into a gaseous refrigerant and requires that more vaporization cores is provided and the refrigerant wet the surface of the heat exchange tube, thereby improving heat exchange property.
- the heat exchange tube and the heat exchanger according to some embodiments of the present disclosure meet the requirements of the heat pump unit on refrigeration and heating when the working condition is adjusted.
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Description
- The present invention relates to the field of air conditioning, and in particular, relates to a heat exchange tube, a heat exchanger and a heat pump unit. In particular, the present invention relates to a heat exchange tube as defined in the preamble of
claim 1, and as illustrated inDE 33 322 82 . - Due to different functions and working principles, the heat exchanger for the flooded heat pump unit is divided into a flooded evaporator and a flooded condenser, which are two heat exchangers with different structural forms. Similarly, the heat exchange tube, as a core component of the flooded heat exchanger, is also divided into a flooded evaporation tube and a flooded condenser tube.
- Based on the evaporation and condensation functional requirements on the heat exchanger by the heat pump unit, it is necessary to redesign and adjust the structure of the heat exchanger so as to obtain a structure type of the heat exchanger which is adapted to meet both evaporation and condensation requirements. However, the development of the evaporative and condensing heat exchange tube of the heat exchanger has become a bottleneck of the development of the unit.
- Therefore, it is necessary to develop a heat exchange tube which can meet both evaporation and condensation functions.
-
DE 3332282A1 relates to a heat transfer pipe, including a cylindrical heat transfer pipe body and a plurality of circumferential or spiral fins integrally formed on the outer surface of the pipe body, the upper portion of each of the fins having one or more circumferential grooves to divide it circumferentially into at least two parts and a plurality of axially extending breaks to divide it axially into a number of parts. The fins further may have notches formed therein with a predetermined pitch in a direction crossing the fins to divide them into a plurality sections, and a plurality of discrete beads are integrally formed on the inner surface of the body along imaginary lines having a lead angle which is in reverse relation to the lead angle of the fins, the beads being formed on at least some of the intersections between the imaginary lines and the fins. - The present invention is defined in
claim 1. - In some embodiments, the fins are arranged on the outer surface of the tube body spirally or in parallel, a channel is formed between two adjacent fins, and a gap is formed between adjacent transverse fin parts in the channel.
- In some embodiments, the fins are arranged on the outer surface of the tube body spirally or in parallel, a channel is formed between two adjacent fins (20), and the transverse fin part divides the channel into an outer cavity and an inner cavity, the inner cavity is close to the outer surface of the tube body relative to the outer cavity.
- In some embodiments, a first groove is disposed on a wall surface of the inner cavity.
- In some embodiments, the first groove is formed on the outer surface of the tube body.
- In some embodiments, a cross section of the first groove is I-shaped, cross-shaped, X-shaped, U-shaped, triangular or polygonal with more than three sides.
- In some embodiments, the transverse fin part is constructed as a curved shape, or a surface of the transverse fin part is constructed as a curved shape.
- In some embodiments, the transverse fin part is provided with a plurality of slits, at least one of the slits extends to one concave portion of the saw-toothed part.
- In some embodiments, each of the slits is correspondingly connected to one corresponding concave portion of the saw-toothed part.
- In some embodiments, the transverse fin parts disposed on two sides of the fin root part symmetrically incline towards the outer surface of the tube body.
- In some embodiments, a cross section of a convex portion of the saw-toothed part is trapezoidal, triangular or rectangular and is roughly vertical to an axis of the tube body.
- In some embodiments, a cross section of a convex portion of the saw-toothed part is rectangular, parallelogram-shaped or trapezoidal and is roughly parallel with an axis of the tube body.
- In some embodiments, a cross section of concave portion of the saw-toothed part is trapezoidal, triangular or rectangular.
- In some embodiments, at least one of a spine and a second groove is arranged on at least one side of the fin top part.
- In some embodiments, the fin is arranged on the outer surface of the tube body spirally, there are 40 to 95 convex portions of the saw-toothed part disposed in a segment of the fin on a circumference of the tube body.
- In some embodiments, an inner surface of the tube body is provided with a thread, an included angle between a tangent line of the thread and an axis line of the tube body is 15° to 65°.
- Some embodiments of the present disclosure provide a heat exchanger, including the above described heat exchange tube.
- Some embodiments of the present disclosure provide a heat pump unit, including the above described heat exchanger.
- In some embodiments, the heat pump unit is a flooded heat pump unit.
- According to the invention, it is beneficial to enlarging a heat exchange area of the fin top part and thinning a liquid film; the saw-toothed fin top part is favorable for refrigerant flowing, thereby enhancing condensation property; and the transverse fin part extends laterally from the two sides of the fin to form a lower layer of channel and an upper layer of channel beneficial to evaporation and condensation, such that the heat exchange tube has both evaporation and condensation properties.
-
-
FIG. 1 is a schematic overall diagram of a heat exchange tube; -
FIG. 2 is a schematic partial diagram of a heat exchange tube; -
FIG. 3 is a schematic section view of a heat exchange tube not corresponding to the invention; -
FIG. 4 is a schematic partial enlarged diagram of a heat exchange tube not corresponding to the invention; -
FIG. 5 is a schematic partial enlarged diagram of a fin of a heat exchange tube according to the invention; -
FIG. 6 is a schematic partial side view of a heat exchange tube according to the invention; and -
FIG. 7 is a schematic partial enlarged diagram of a fin of a heat exchange tube according to the invention. - The following clearly and completely describes the technical solutions in the embodiments with reference to the accompanying drawings in the embodiments of the present invention.
- Apparently, the described embodiments are merely a portion rather than all of the embodiments of the present invention.
- In the description of the present disclosure, it should be understood that an azimuth or position relationship indicated by terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is an azimuth or position relationship based on the accompanying draws, which is only for facilitating description of the present disclosure and simplifying description, but not indicates or implies that the referred device or component must have a specific azimuth and perform construction and operation in the specific azimuth; therefore, it cannot be interpreted as a limitation to the protection scope of the present disclosure.
- One of the objectives of some embodiments of the present invention is to provide a heat exchange tube with evaporation and condensation functions, a heat exchanger and a heat pump unit.
- As shown in
FIG. 1 , the heat exchange tube includes atube body 10, wherein thetube body 10 includes an unprocessedsmooth section 11, a fin-formingsection 13 completely forming a fin along a circumference, and atransition section 12 between thesmooth section 11 and the fin-formingsection 13. - The
smooth section 11 is used to perform expanded connection and sealing between a shell tube and the heat exchange tube. The heat exchange tube maintains a vibration state for a long time when operating in a unit, and thetransition section 12 is used to enhance the strength of the heat exchange tube. An outer diameter of thetransition section 12 is less than that of thesmooth section 11. - As shown in
FIG. 2 , the heat exchange tube includes atube body 10 and afin 20 arranged on an outer surface of thetube body 10. Thefin 20 is arranged on a fin-formingsection 13 of thetube body 10. - In some embodiments, the
fin 20 is a spiral fin and is spirally arranged on thetube body 10 along an axial direction of thetube body 10. - In some embodiments, the
fin 20 includes a plurality of annular fins, wherein each of the annular fins is arranged along a circumferential direction of thetube body 10, and all the annular fins are arranged at intervals along an axial direction of thetube body 10. Further, all the annular fins are arranged in parallel. - In some embodiments, the
fin 20 includes a plurality of linear fins, wherein a length direction of each of the linear fins is consistent with an axial direction of thetube body 10, and all the linear fins are arranged at intervals along a circumferential direction of thetube body 10. Further, all the linear fins are arranged in parallel. - As shown in
FIG. 4 , in some embodiments, thefin 20 includes afin root part 23, a transversefine portion 21 and a fintop part 22. - In some embodiments, the
fin root part 23 is arranged on an outer surface of thetube body 10. - In some embodiments, the
transverse fin part 21 is arranged on the top of thefin root part 23 and extends laterally from two sides of thefin root part 23. A part below thetransverse fin part 21, thefin root part 23 and the outer surface of thetube body 10 form a space beneficial to improving evaporation property. - In some embodiments, the fin
top part 22 is arranged on the top of thetransverse fin part 21 and is constructed as a saw-toothed part; a concave portion of the saw-toothed part of the fintop part 22 extends to thetransverse fin part 21 and is adapted to enlarging the heat exchange area of the fintop part 22 and thinning a liquid film; and the saw-toothed fintop part 22 is favorable for refrigerant flowing, thereby improving condensation property. - In some embodiments, a thickness of the fin
top part 22 is less than that of thefin root part 22, which is beneficial to forming a sharp edge on the fintop part 22, thereby piercing a gaseous refrigerant carrying liquid. - In some embodiments, the fin
top part 22 is formed by extruding the top of thefin 20, a thickness of the fintop part 22 is less than that of thefin root part 23, and thetransverse fin part 21 extends laterally from the two sides of thefin 20 relative to thefin root part 23 and the fintop part 22. - As shown in
FIG. 2 andFIG. 4 , the fintop part 22 is constructed as a saw-toothed part, a concave portion of the saw-toothed part extends to thetransverse fin part 21 and thetransverse fin part 21 extends laterally from the two sides of thefin 20. The structure has both evaporation and condensation properties, thereby relieving the problem of property attenuation when the conventional condenser tube serves as an evaporation tube and relieving the problem of property attenuation when the conventional evaporation tube serves as a condenser tube. - As shown in
FIG. 4 , thefins 20 are arranged on an outer surface of thetube body 10 spirally or in parallel, a channel is formed among spiral body of the fin, or a channel is formed between two adjacent fins of the plurality of fins, and agap 26 is formed between two adjacenttransverse fin parts 21 in the channels. - In some embodiments, a
gap 26 is formed between two adjacenttransverse fin parts 21 in the channel along an extending direction of thetransverse fin part 2. - In some embodiments, an overlapped section is arranged between two adjacent
transverse fin parts 21 in the channel along an extending direction of thetransverse fin part 2, and agap 26 is disposed in a space of the adjacenttransverse fin parts 21 in a height direction of the fin. Further, one of thetransverse fin parts 21 is higher than the adjacenttransverse fin part 21 in the height direction of the fin. Or a tail end (the overlapped section position) of one of thetransverse fin parts 21 is higher than a tail end (the overlapped section position) of the adjacenttransverse fin part 21 in the height direction of the fin. - In some embodiments, a
gap 26 is formed between the adjacenttransverse fin parts 21 in the channel, and a upper layer of the channel is fluid communication with a lower layer of the channel, among the twoadjacent fins 20, such that it is beneficial to circulation of a liquid refrigerant and the condensation effect is enhanced; furthermore, when the refrigerant is evaporated, supplementation of the refrigerant and discharge of a gaseous refrigerant are benefited, and the evaporation function is enhanced; and the evaporation and condensation properties are not attenuated. - In some embodiments, the
fins 20 are arranged on an outer surface of thetube body 10 spirally or in parallel, thetransverse fin part 21 divides a channel formed between the twoadjacent fins 20 into anouter cavity 24 and aninner cavity 25, and theinner cavity 25 is close to the outer surface of thetube body 10 relative to theouter cavity 24. - In some embodiments, the
transverse fin part 21 divides the channel formed between the twoadjacent fins 20 into anouter cavity 24 and aninner cavity 25. Agap 26 is formed between the adjacenttransverse fin parts 21 in the channel, which is beneficial to ensuring escape of evaporative bubbles formed by the lower layer of the channel with evaporation function and is favorable for discharging of a liquid refrigerant during condensation of the refrigerant. Theinner cavity 25 is surrounded by thetransverse fin part 21, thefin root part 23 and the outer surface of thetube body 10 and principally forms a small cavity favorable for evaporation by mainly adopting a nucleate boiling principle. Theouter cavity 25 is surrounded by thetransverse fin part 21 and the fintop part 22, and mainly enlarges the heat exchange area and thins a liquid film to facilitate condensation. Therefore, the evaporation and condensation properties are not attenuated. - In some embodiments, a
first groove 251 is disposed on a wall surface of theinner cavity 25, which enables an inner surface of theinner cavity 25 to be rough and is beneficial to forming a vaporization core required by evaporation, thereby enhancing evaporative heat exchange. - In some embodiments, the
first groove 251 is disposed on an outer surface of thetube body 10. A secondary refrigerant is introduced into thetube body 10 and is used to exchange heat with a refrigerant outside thetube body 10, and thefirst groove 251 is disposed on the outer surface of thetube body 10, it is benefit to forming a vaporization core on the outer surface of thetube body 10 and enhancing evaporative heat exchange; and the heat exchange area is increased on the basis of the outer surface of the originalsmooth tube body 10. Further, a plurality offirst grooves 251 are disposed on the outer surface of thetube body 10 along a direction of channel among twoadjacent fins 20. - In some embodiments, the outer surface of the
tube body 10 is barreled and flattened by a smooth barreling wheel, such that a multi-pit surface structure is formed on the outer surface of thetube body 10, thereby providing a vaporization core required by evaporation and enhancing evaporative heat exchange. - In some embodiments, the
first groove 251 is disposed on a surface of thefin root part 23, which is beneficial to forming a vaporization core. Further, thefirst groove 251 is arranged along a height direction of thefin root part 23 so as to facilitate flowing of a refrigerant along thefirst groove 251. - In some embodiments, a cross section of the
first groove 251 is I-shaped, cross-shaped, X-shaped, U-shaped, round, triangular, quadrangular, polygonal (more than four sides), or of other irregular or regular shapes. - The
inner cavity 25 is provided with a plurality offirst grooves 251. The uneven structure is beneficial to increasing the roughness of theinner cavity 25, forming a vaporization core and enhancing the evaporation function. - In some embodiments, the
transverse fin part 21 is constructed as a curved shape, or a surface of thetransverse fin part 21 is formed as a curved shape. A body or surface of thetransverse fin part 21 is constructed as a curved shape, which is beneficial to enlarging the heat exchange area and thinning a liquid film and facilitates flowing of a refrigerant. - In some embodiments, the
transverse fin part 21 is provided with aslit 211 favorable for fluid to pass through, thereby facilitating supplementation of a refrigerant and escape of evaporative bubbles. - In some embodiments, the
transverse fin part 21 is provided with a plurality ofslits 211, each of theslits 211 correspondingly extends to one corresponding concave portion of the saw-toothed part of the fintop part 22. Arranging theslits 211 facilitates flowing of the refrigerant; furthermore, theslits 211 extend to the concave portions of the fintop part 22, thereby facilitating flowing of the refrigerant to theinner cavity 25. - In some embodiments, the
slit 211 is long strip-shaped and extend along an extending direction of thetransverse fin part 21. - In some embodiments, the
transverse fin part 21 is provided with a plurality of round, triangular, square, or polygonal (more than four sides), or other regular or irregular through holes, thereby facilitating flowing of a refrigerant to theinner cavity 25 or discharge of a gaseous refrigerant. - According to the invention, the
transverse fin part 21 at least disposed on one side of thefin root part 23 inclines towards the outer surface of thetube body 10, thereby facilitating flowing of a refrigerant to theinner cavity 25. - In some embodiments, the
transverse fin parts 21 disposed on two sides of thefin root part 23 symmetrically incline towards the outer surface of thetube body 10, and a cross section of thefin root part 23 combined with thetransverse fin parts 21 on two sides of the top of thefin root part 23 is similarly shaped like an umbrella (as shown inFIG. 6 ), thereby facilitating flowing of a refrigerant to theinner cavity 25. - In some embodiments, the
transverse fin parts 21 disposed on two sides of thefin root part 23 are arranged horizontally. - In some embodiments, a first cross section of a convex portion of the saw-toothed part of the fin
top part 22 is trapezoidal, triangular or rectangular and is roughly vertical to an axis of thetube body 10. - In some embodiments, a second cross section of a convex portion of the saw-toothed part of the fin
top part 22 is rectangular, parallelogram-shaped or trapezoidal and is roughly parallel with an axis of thetube body 10. As shown inFIG. 5 , β1 is 90 degrees when the second cross section is rectangular, or β1is an acute angle or an obtuse angle when the second cross section is parallelogram-shaped or trapezoidal. - In some embodiments, a concave portion of the saw-toothed fin
top part 22 is trapezoidal, triangular or rectangular. - In some embodiments, the fin
top part 22 is provided with at least one of a spine 221 (as shown inFIG. 6 ) and a second groove 222 (as shown inFIG. 7 ). - Further, the
spine 221 is arranged on at least one side of the fintop part 22 and is adapted to enlarge the heat exchange area of the fintop part 22, such that it is beneficial to piercing a liquid film and accelerating discharge of condensed liquid. Asecond groove 222 is disposed on at least one side of the fintop part 22 and is adapted to enlarge the heat exchange area of the fintop part 22, thereby thinning a liquid film and enhancing condensation property. Further, thesecond grooves 222 are disposed on two sides of the fintop part 22, or disposed at the top of the fintop part 22. - In some embodiments, the
fin 20 is arranged on the outer surface of the tube body (10) spirally, there are 40 to 95 convex portions of the saw-toothed fintop part 22 in a segment of thefin 20 on a circumference of thetube body 10. - Further, a plurality of slits is arranged at the
transverse fin part 21, and each of theslits 211 extends correspondingly to a corresponding concave portion of the saw-toothed fintop part 22, and the number of slits is 40 to 95, thereby enhancing evaporation effect and facilitating supplementation of a refrigerant and discharge of a gaseous refrigerant. - In some embodiments, an inner surface of the
tube body 10 is provided with athread 14 while an outer surface of thetube body 10 is enhanced; an included angle β2 between a tangent line of thethread 14 and an axis line of thetube body 10 is 15° to 65° (as shown inFIG. 3 ), that is, a spiral angle β2 is 15° to 65°; and the thread is adapted to increase a disturbance intensity of a secondary refrigerant side, and the heat exchange area is increased by increasing the spiral angle. - In some embodiments, a plurality of
threads 14 are distributed on an inner side of thetube body 10 uniformly along a circumferential direction, wherein the number n of the threads is equal to 30 to 65. Increment of the threads is mainly adapted to enlarge the heat exchange area and improve a disturbance intensity of a secondary refrigerant on an inner side, thereby enhancing heat exchange of the inner side. - In some embodiments, an inner side of the
tube body 10 is rolled by a grooved lining core to form a spirally protruded internal thread structure. - In some embodiments, the
fins 20 are distributed along a surface of thetube body 10 in a single-head spiral manner; and due to single spiral distribution, the fins are formed more uniformly and have higher consistency. - In some embodiments, a bottom of the convex portion of the saw-toothed fin
top part 22 is crack-shaped, thereby facilitating processing and refrigerant flowing. - In some embodiments, the
fin 20 on the heat exchange tube is processed by a special fin rolling mill and is rolled by cutter combination and a lining core grooving mold and by an extrusion forming scrapless processing process, wherein both sides are strengthened simultaneously. As a refrigerant side of the heat exchange tube has higher requirement on cleanliness, copper scraps are avoided by extrusion forming scrapless processing. Moreover, since integration by extrusion forming, the strength is higher. - In some embodiments, since a width h1 of a channel formed between the fins is 0.254 mm to 0.558 mm, the condensation effect of the upper layer is taken into consideration. If the gap is too small, the lower layer of evaporation cavity is liable to block and the condensed liquid of the upper layer is unfavorable for discharging, thereby reducing the condensation effect.
- As shown in
FIG. 3 , a thickness h2 of thefin 20 is 0.15 mm to 0.305 mm. If thefin 20 is too thin, it is unfavorable for rolling two sides of thefin 20 to form atransverse fin part 21; and if thefin 20 is too thick, thefin 20 extends to the two sides to enable a cavity to be small, even to be congested, which is unfavorable for deformation of an evaporation cavity. - In a specific embodiment, a
tube body 10 with an outer diameter of 19.05 mm and a wall thickness of 1.15 mm is processed. On the basis of thetube body 10, a certain spirally protruded structure (fin 20) is extruded by a combined mold, the extruded protruded structured is rolled by cutter combination, and saw-toothed parts are formed on the fintop part 22. First, the surface area of the heat exchange tube is increased, a rough and uneven outer surface is formed by knurling and movement of condensation is promoted; and second, a thickness of a refrigerant liquid film is reduced. Meanwhile, due to deformation caused by processing, a natural crack is formed at the bottom of the saw-toothed fintop part 22. Two sides of the fin are extruded to form atransverse fin part 21 extending into a fin groove while the spiral fin is extruded. Meanwhile, a gasket of 0.1 mm is placed between the adjacenttransverse fin parts 21 to form agap 26, and liquid is discharged by channels among the fins, thereby enhancing the condensation effect. The top of the fin is extruded to form a saw-toothed part, and aslit 211 is naturally formed while the fin is extruded to extend into a groove (the two sides of the fin). - In some embodiments, a working principle of the heat exchange tube is as follows.
- The heat exchange tube serves as an evaporation tube under a working condition of refrigeration: a liquid refrigerant on an outer side of the
tube body 10 is mainly evaporated in theinner cavity 25; firstly, the liquid refrigerant enters into theinner cavity 25 through at least one of thegap 26 and theslit 211 from theouter cavity 24, the surface temperature of thetube body 10 at the bottom of theinner cavity 25 is high and has superheat degree required for evaporation; meanwhile, the surface of thetube body 10 at the bottom of theinner cavity 25 is provided with a plurality offirst grooves 251, thereby increasing the roughness of the fin root part and forming a large number of vaporization cores on the fin root part; the saturated liquid refrigerant is evaporated in theinner cavity 25 with a certain superheat degree and a large number of vaporization cores, a large number of bubbles generated by evaporation is discharged through at least one of thegap 26 and theslit 211; and meanwhile, the liquid refrigerant in theinner cavity 25 is also supplemented by at least one of thegap 26 and theslit 211. - The heat exchange tube serves as a condenser tube under a working condition of heating: a high-pressure gaseous refrigerant on an outer side of the tube is mainly condensed in the
outer cavity 24, and the saw-toothed fintop part 22 on thefin 20 is formed by extrusion, such that two sides of the convex portion of the fintop part 22 are sharp, refrigerant bubbles are pierced and the gaseous refrigerant is rapidly condensed into liquid. The concave portion of the fintop part 22 and thetransverse fin part 21 inclining towards an outer surface of thetube body 10 significantly increase the surface area of theouter cavity 24, which is especially favorable for condensation and heat exchange of the gaseous refrigerant. - As the
transverse fin part 21 is inclined or bended, the liquid refrigerant generated on thetransverse fin part 21 by condensation flows downwards under the comprehensive action of a surface tension or a gravity force of the liquid refrigerant and is discharged into theinner cavity 25 timely through at least one of thegap 26 and theslit 211 to be further cooled. Due to circumferential communication of theinner cavity 25, a certain amount of liquid refrigerant which is accumulated finally is discharged out of a surface of the heat exchange tube through the bottom of the heat exchange tube. - Some embodiments provide a heat exchanger, including the above described heat exchange tube.
- Some embodiments provide a heat pump unit, including the above described heat exchanger. By adoption of the above described heat exchanger, energy efficiency of the heat pump unit is improved.
- In some embodiments, the heat pump unit is a flooded heat pump unit.
- In the flooded heat pump unit, evaporation and condensation have different working principles and functions and are two opposite processes during operation. The condensation process is to convert a gaseous refrigerant into a liquid refrigerant, thin a liquid film as much as possible and discharge the liquid refrigerant timely, such that the condensation process operates continuously and efficiently, otherwise, the condensation property will be attenuated. The evaporation process is to convert a liquid refrigerant into a gaseous refrigerant and requires that more vaporization cores is provided and the refrigerant wet the surface of the heat exchange tube, thereby improving heat exchange property.
- The heat exchange tube and the heat exchanger according to some embodiments of the present disclosure meet the requirements of the heat pump unit on refrigeration and heating when the working condition is adjusted.
- In the description of the present disclosure, it should be understood that the words "first", "second", "third" and the like for limiting parts are merely for convenience of distinguishing the parts. Unless otherwise stated, the above words do not have special meanings and cannot be construed as limitations to the protection scope of the present disclosure.
- Finally, it should be noted that the above embodiments are merely intended to illustrate the technical solutions of the present disclosure and are not to limit them.
Claims (15)
- A heat exchange tube, comprising:a tube body (10), anda fin (20), arranged on an outer surface of the tube body (10), and comprising:a fin root part (23), arranged on the outer surface of the tube body (10);a transverse fin part (21), arranged on the top of the fin root part (23) and extending laterally from two sides of the fin root part (23); anda fin top part (22), arranged on the top of the transverse fin part (21) and configured as a saw-toothed part, a concave portion of the saw-toothed part extending to the transverse fin part (21);the heat exchange tube is characterized in that the transverse fin part (21) at least disposed on one side of the fin root part (23) inclines towards the outer surface of the tube body (10).
- The heat exchange tube according to claim 1, wherein the fins (20) are arranged on the outer surface of the tube body (1) spirally or in parallel, a channel is formed between two adjacent fins (20), and a gap (26) is formed between two adjacent transverse fin parts (21) in the channel.
- The heat exchange tube according to claim 1, wherein the fins (20) are arranged on the outer surface of the tube body (10) spirally or in parallel; a channel is formed between two adjacent fins (20), and the transverse fin part (21) divides the channel into an outer cavity (24) and an inner cavity (25), the inner cavity (25) is close to the outer surface of the tube body (10) relative to the outer cavity (24).
- The heat exchange tube according to claim 3, wherein a first groove (251) is disposed on a wall surface of the inner cavity (25), and optional, wherein the first groove (251) is formed on the outer surface of the tube body (10).
- The heat exchange tube according to claim 4, wherein a cross section of the first groove (251) is I-shaped, cross-shaped, X-shaped, U-shaped, triangular or polygonal with more than three sides.
- The heat exchange tube according to claim 1, wherein the transverse fin part (21) is constructed as a curved shape, or a surface of the transverse fin part (21) is constructed as a curved shape.
- The heat exchange tube according to claim 1, wherein the transverse fin part (21) is provided with a plurality of slits (211), at least one of the slits (211) extends to one concave portion of the saw-toothed part.
- The heat exchange tube according to claim 7, wherein each of the slits (211) is correspondingly connected to one corresponding concave portion of the saw-toothed part.
- The heat exchange tube according to claim 1, wherein the transverse fin parts (21) disposed on two sides of the fin root part (23) symmetrically incline towards the outer surface of the tube body (10).
- The heat exchange tube according to claim 1, wherein a cross section of a convex portion of the saw-toothed part is trapezoidal, triangular or rectangular and is vertical to an axis of the tube body (10); or, wherein a cross section of a convex portion of the saw-toothed part is rectangular, parallelogram-shaped or trapezoidal and is parallel with an axis of the tube body (10); or, wherein a cross section of the concave portion of the saw-toothed part is trapezoidal, triangular or rectangular.
- The heat exchange tube according to claim 1, wherein at least one of a spine (221) and a second groove (222) is arranged on at least one side of the fin top part (22).
- The heat exchange tube according to claim 1, wherein the fin (20) is arranged on the outer surface of the tube body (10) spirally, and wherein there are 40 to 95 convex portions of the saw-toothed part in a segment of the fin (20) on a circumference of the tube body (10).
- The heat exchange tube according to claim 1, wherein an inner surface of the tube body (10) is provided with a thread (14), an included angle between a tangent line of the thread (14) and an axis line of the tube body (10) is 15° to 65°.
- A heat exchanger, comprising the heat exchange tube according to any one of claims 1 to 13.
- A heat pump unit, comprising the heat exchanger according to claim 14, and optional, wherein the heat pump unit is a flooded heat pump unit.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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CN201810409402.5A CN108387131B (en) | 2018-05-02 | 2018-05-02 | Heat exchanger tube, heat exchanger and heat pump unit |
PCT/CN2018/121202 WO2019210690A1 (en) | 2018-05-02 | 2018-12-14 | Heat exchange tube, heat exchanger and heat pump unit |
Publications (3)
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EP3736521A1 EP3736521A1 (en) | 2020-11-11 |
EP3736521A4 EP3736521A4 (en) | 2020-12-30 |
EP3736521B1 true EP3736521B1 (en) | 2023-09-06 |
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EP18917408.9A Active EP3736521B1 (en) | 2018-05-02 | 2018-12-14 | Heat exchange tube, heat exchanger and heat pump unit |
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EP (1) | EP3736521B1 (en) |
CN (1) | CN108387131B (en) |
RU (1) | RU2760467C1 (en) |
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CN108387131B (en) * | 2018-05-02 | 2019-11-19 | 珠海格力电器股份有限公司 | Heat exchanger tube, heat exchanger and heat pump unit |
CN109000494A (en) * | 2018-08-16 | 2018-12-14 | 上海欧贡制冷科技有限公司 | A kind of evaporating heat-exchanging pipe |
CN109099748A (en) * | 2018-08-30 | 2018-12-28 | 珠海格力电器股份有限公司 | Heat exchanger tube and air conditioner |
CN109099749A (en) * | 2018-08-30 | 2018-12-28 | 珠海格力电器股份有限公司 | Heat exchanger tube and heat pump unit |
CN108917439B (en) * | 2018-08-30 | 2024-04-19 | 无锡格林沃科技有限公司 | Phase change radiator |
CN109099750A (en) * | 2018-08-30 | 2018-12-28 | 珠海格力电器股份有限公司 | Heat exchanger tube and heat pump unit |
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CN109282688A (en) * | 2018-11-27 | 2019-01-29 | 珠海格力电器股份有限公司 | The processing method of air-conditioning condenser heat exchanger tube, condenser, air-conditioning and the heat exchanger tube |
CN110108148A (en) * | 2019-05-29 | 2019-08-09 | 珠海格力电器股份有限公司 | Heat exchanger tube and air conditioner equipped with it |
CN111692893A (en) * | 2019-12-13 | 2020-09-22 | 浙江三花智能控制股份有限公司 | Heat exchanger and method for manufacturing heat exchange assembly |
JP7370883B2 (en) * | 2020-01-31 | 2023-10-30 | 古河電気工業株式会社 | Heat transfer member and cooling device having heat transfer member |
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SU1605128A1 (en) * | 1988-10-28 | 1990-11-07 | Предприятие П/Я В-2964 | Heat-exchange pipe |
US5203404A (en) * | 1992-03-02 | 1993-04-20 | Carrier Corporation | Heat exchanger tube |
RU2066036C1 (en) * | 1993-05-18 | 1996-08-27 | Деулин Константин Николаевич | Heat exchange member |
RU2178132C2 (en) * | 1999-04-26 | 2002-01-10 | ОАО "Пензкомпрессормаш" | Heat exchange element |
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CN107782192B (en) * | 2017-10-27 | 2023-12-01 | 华南理工大学 | Stepped grid inner and outer finned tube for evaporation and condensation |
CN208155132U (en) * | 2018-05-02 | 2018-11-27 | 珠海格力电器股份有限公司 | Heat exchanger tube, heat exchanger and heat pump unit |
CN108387131B (en) * | 2018-05-02 | 2019-11-19 | 珠海格力电器股份有限公司 | Heat exchanger tube, heat exchanger and heat pump unit |
-
2018
- 2018-05-02 CN CN201810409402.5A patent/CN108387131B/en active Active
- 2018-12-14 EP EP18917408.9A patent/EP3736521B1/en active Active
- 2018-12-14 WO PCT/CN2018/121202 patent/WO2019210690A1/en unknown
- 2018-12-14 RU RU2020131269A patent/RU2760467C1/en active
Also Published As
Publication number | Publication date |
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RU2760467C1 (en) | 2021-11-25 |
CN108387131B (en) | 2019-11-19 |
EP3736521A1 (en) | 2020-11-11 |
EP3736521A4 (en) | 2020-12-30 |
WO2019210690A1 (en) | 2019-11-07 |
CN108387131A (en) | 2018-08-10 |
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