WO2013084508A1 - フィンチューブ型熱交換器 - Google Patents
フィンチューブ型熱交換器 Download PDFInfo
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- WO2013084508A1 WO2013084508A1 PCT/JP2012/007857 JP2012007857W WO2013084508A1 WO 2013084508 A1 WO2013084508 A1 WO 2013084508A1 JP 2012007857 W JP2012007857 W JP 2012007857W WO 2013084508 A1 WO2013084508 A1 WO 2013084508A1
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- WIPO (PCT)
- Prior art keywords
- bend pipe
- grooved
- tube
- heat exchanger
- peripheral surface
- Prior art date
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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
- F28F1/12—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
- F28F1/32—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 having portions engaging further tubular elements
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- 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
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
- F28D1/0475—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits having a single U-bend
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- 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
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
- F28D1/0477—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
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- 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
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
- F28D1/05316—Assemblies of conduits connected to common headers, e.g. core type radiators
- F28D1/05325—Assemblies of conduits connected to common headers, e.g. core type radiators with particular pattern of flow, e.g. change of flow direction
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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
- F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
Definitions
- the present invention relates to a finned tube heat exchanger.
- Patent Document 1 discloses a finned tube heat exchanger 100 as shown in FIG.
- the heat exchanger 100 includes a plurality of fins 110 arranged in parallel and a refrigerant flow path 140 that passes through the plurality of fins 110 and through which the refrigerant flows.
- Each fin 110 has an elongated shape, and the refrigerant flow path 140 is configured by a hairpin tube 120 arranged in two rows in the longitudinal direction of the fin 110 and a return bend tube 130 that connects the ends of the hairpin tube 120. Yes.
- the hairpin tube 120 a grooved tube in which a plurality of spiral grooves are formed on the inner peripheral surface is used.
- the refrigerant flowing in the hairpin tube 120 is guided by the groove to form a swirling flow, thereby improving the heat transfer coefficient between the refrigerant and the tube.
- a grooved tube is also used for the return bend tube 130, and the swirl flow formed by the hairpin tube 120 is maintained so as not to collapse as much as possible by the return bend tube 130.
- the distance required to form the swirl flow again in the hairpin tube 120 is shortened, and the heat exchange capability between the air flowing between the fins 110 and the refrigerant is increased.
- the configuration of the heat exchanger 100 shown in FIG. 5 is not assumed to be actually used in a refrigeration cycle apparatus.
- a finned tube heat exchanger used in an air conditioner in either heating operation or cooling operation, one of the refrigerant channels has a high gas phase ratio in the refrigerant, and the other has a liquid phase in the refrigerant. The ratio becomes higher on the liquid phase side.
- the refrigerant flow path is branched from the main flow path into a plurality of branch paths from the liquid phase side to the gas phase side in order to reduce the flow rate of the refrigerant during heat exchange, and a header is disposed at the end of the refrigerant flow path Is done.
- the finned tube heat exchanger disclosed in Patent Document 1 uses a grooved tube also on the gas phase side where the gas phase ratio is high, and considers the liquid phase ratio of the refrigerant flowing in the return bend pipe. Not designed.
- an object of the present invention is to provide a fin tube type heat exchanger suitable for a refrigeration cycle apparatus.
- Each of the plurality of branch paths includes a plurality of hairpin tubes in which a plurality of spiral grooves are formed on an inner peripheral surface, and a plurality of return bend tubes that connect ends of the hairpin tubes.
- the plurality of return bend pipes in each of the plurality of branch paths include a smooth bend pipe having a smooth inner peripheral surface and a grooved bend pipe having an inner peripheral surface in which a plurality of spiral grooves are formed.
- the smooth bend pipe provides a finned tube heat exchanger that is located closest to the header when the branch path is followed from the header.
- the schematic block diagram of the finned-tube type heat exchanger which concerns on 1st Embodiment of this invention The schematic block diagram of the finned-tube type heat exchanger which concerns on the modification of 1st Embodiment.
- the schematic block diagram which expanded a part of fin tube type heat exchanger which concerns on another modification of 1st Embodiment The schematic block diagram which expanded a part of fin tube type heat exchanger which concerns on another modification of 1st Embodiment.
- the schematic block diagram of the finned-tube type heat exchanger which concerns on another modification of 1st Embodiment The schematic block diagram of the finned-tube type heat exchanger which concerns on another modification of 1st Embodiment.
- the first aspect of the present disclosure is: A plurality of parallel fins; A plurality of branch paths penetrating the plurality of fins; A header to which one end of each of the plurality of branch paths is connected,
- Each of the plurality of branch paths includes a plurality of hairpin tubes in which a plurality of spiral grooves are formed on an inner peripheral surface, and a plurality of return bend tubes that connect ends of the hairpin tubes.
- the plurality of return bend pipes in each of the plurality of branch paths include a smooth bend pipe having a smooth inner peripheral surface and a grooved bend pipe having an inner peripheral surface in which a plurality of spiral grooves are formed.
- the smooth bend pipe provides a finned tube heat exchanger that is located closest to the header when the branch path is followed from the header.
- the swirl flow formed with a hairpin pipe is maintained to some extent, and the heat exchange between the air flowing between the fins and the refrigerant Capability can be increased.
- the pressure loss of the refrigerant can be suppressed by using the smooth bend pipe in the region where the amount of the liquid phase flow is reduced. As a result, the performance of the refrigeration cycle apparatus using the heat exchanger can be improved.
- the second aspect of the present disclosure further includes a main flow path in which the other ends of the plurality of branch paths are connected directly or via a plurality of relay paths, and the main flow path Includes a plurality of hairpin tubes penetrating the plurality of fins and having a plurality of spiral grooves formed on an inner peripheral surface thereof, and a plurality of return bend tubes connecting the ends of the hairpin tubes,
- the plurality of return bend pipes in the main flow path include a smooth bend pipe having a smooth inner peripheral surface and a grooved bend pipe having an inner peripheral surface in which a plurality of spiral grooves are formed, and the smooth bend pipe Is located farthest from the header when the main flow path is traced from the header via the branch path.
- the performance of the refrigeration cycle apparatus can be improved by reducing the pressure loss by using a smooth bend pipe as the return bend pipe of the main flow path.
- the groove depth of the grooved bend pipe in the main flow path is shallower than the groove depth of the grooved bend pipe in the branch path.
- a tube heat exchanger is provided in the main flow path.
- the main flow path not only the flow rate of the refrigerant is large, but also the dryness of the refrigerant is extremely small. That is, since the amount of the liquid phase refrigerant is large, a swirl flow is easily formed. Therefore, by using a grooved bend pipe having a relatively shallow groove, an increase in pressure loss can be suppressed while maintaining a swirling flow.
- the relay path passes through the plurality of fins, and a plurality of spiral grooves are formed on an inner peripheral surface.
- a hairpin tube and a return bend tube that connects ends of the hairpin tube, and the return bend tube in the relay path is a grooved bend tube having an inner peripheral surface in which a plurality of spiral grooves are formed.
- a fin tube heat exchanger is provided in which the groove depth of the grooved bend pipe in the relay path is shallower than the groove depth of the grooved bend pipe in the branch path.
- the use of a grooved bend pipe with a relatively shallow groove increases pressure loss while maintaining the swirl flow to some extent. Can be prevented. Since a swirl flow is more difficult to form in the branch path than in the relay path, the swirl flow is maintained and the heat exchange capacity is increased by using a grooved bend pipe having a relatively deep groove.
- the performance of the refrigeration cycle apparatus can be improved by arranging the smooth bend pipe and the two types of grooved bend pipes having different groove shapes according to the flow state.
- the fifth aspect of the present disclosure further includes a main flow path in which the other ends of the plurality of branch paths are connected directly or via a plurality of relay paths, and the main flow path Includes a plurality of hairpin tubes penetrating the plurality of fins and having a plurality of helical grooves formed on an inner peripheral surface thereof, and a return bend tube connecting ends of the hairpin tubes,
- the return bend pipe in (1) provides a finned tube heat exchanger, which is a smooth bend pipe having a smooth inner peripheral surface. According to this configuration, the performance of the refrigeration cycle apparatus can be improved by reducing the pressure loss by using the smooth bend pipe, rather than using the grooved bend pipe to facilitate reshaping of the swirling flow.
- the finned tube heat exchanger includes at least three hairpin tubes in the plurality of branch paths. provide. According to this configuration, two or more return bend tubes can be provided by three or more hairpin tubes.
- a groove lead angle of the grooved bend pipe is determined by a groove lead formed on an inner peripheral surface of the hairpin pipe.
- a finned tube heat exchanger that is less than or equal to a corner.
- the groove depth of the grooved bend pipe is a depth of a groove formed on an inner peripheral surface of the hairpin pipe.
- a finned tube heat exchanger shallower than the above is provided.
- the number of grooves in the tube axis orthogonal section of the grooved bend tube is the number of grooves in the tube axis orthogonal section of the hairpin tube.
- the fin tube type heat exchanger as described above is provided. According to this configuration, the greater the number of grooves in the grooved bend pipe, the easier it is for the refrigerant passing through the grooved bend pipe to form a swirling flow.
- FIG. 1A shows a fin-tube heat exchanger 1A according to the first embodiment of the present invention.
- This heat exchanger 1A is used as an outdoor heat exchanger of the air conditioner, and performs heat exchange between the refrigerant and the air.
- this invention is applicable also to the heat exchanger used for other refrigeration cycle apparatuses, such as a water heater, for example.
- the heat exchanger 1 ⁇ / b> A includes a plurality of fins 2 that are arranged in parallel at regular intervals, and a refrigerant channel 10 that includes a main channel 6, a plurality of branch channels 7, and a header 3. Air flows between the fins 2.
- the refrigerant flow path 10 the refrigerant flows from the main flow path 6 toward the header 3 during the heating operation in which the heat exchanger 1A functions as an evaporator, and from the header 3 in the cooling operation in which the heat exchanger 1A functions as a condenser.
- the refrigerant flows toward the main flow path 6.
- coolant at the time of heating operation is shown by the arrow.
- the upstream end of each flow path during heating operation is referred to as a first end, and the downstream end is referred to as a second end.
- the inlet (or outlet) of the main channel 6 is arranged on the upper side, but as shown in FIG. 1B, the outlet (or inlet) of the main channel 6 may be arranged on the lower side.
- the flow direction of the refrigerant during the cooling operation is indicated by an arrow.
- the first end of the main flow path 6 forms the first end of the refrigerant flow path 10 that serves as a refrigerant inlet during the heating operation.
- the header 3 is provided with a port 31 that forms the second end of the refrigerant flow path 10 that serves as an outlet of the refrigerant during heating operation.
- the first end of each branch path 7 is directly connected to the second end of the main flow path 6, and the second end of each branch path 7 is connected to the header 3. That is, in this embodiment, it has the path
- the end plate 25 is disposed on one side of the fin 2.
- Each fin 2 is elongated, and each fin 2 is provided with a number of through holes arranged in the longitudinal direction of the fin 2.
- the hairpin tube 4 is inserted into the through hole of the fin 2 from the side opposite to the end plate 25, and both ends of the hairpin tube 4 protrude from the end plate 25.
- the hairpin tubes 4 are arranged in two rows in the longitudinal direction of the fins 2, but in FIG. Note that the heat exchange unit including the fins 2 and the hairpin tubes 4 may be L-shaped as viewed from the longitudinal direction of the fins 2 or may be U-shaped.
- a plurality of spiral grooves are formed on the inner peripheral surface of the hairpin tube 4.
- the main flow path 6 includes at least two hairpin tubes 4 and a return bend tube 5 (see FIG. 2A) that connects the ends of the hairpin tubes 4, and the fin 2 is four times or more (twice the number of hairpin tubes 4). Number of times).
- the return bend pipe 5 in the main flow path 6 is a grooved bend pipe 51.
- the grooved bend pipe 51 has an inner peripheral surface in which a plurality of spiral grooves are formed, and the refrigerant passing through the grooved bend pipe 51 forms a swirling flow. It is designed to be easy to do.
- the number and shape of the grooves of the grooved bend pipe 51 are not particularly limited, but preferably satisfy at least one of the following conditions (i) to (iii).
- (I) The lead angle ⁇ of the groove of the grooved bend tube 51 is equal to or less than the lead angle of the groove formed on the inner peripheral surface of the hairpin tube 4. If the lead angle ⁇ of the groove of the grooved bend pipe 51 is small, the flow resistance of the refrigerant passing through the grooved bend pipe 51 becomes small. Therefore, collapse of the swirling flow due to liquid phase deceleration can be reduced, and the grooved bend pipe 51 It becomes easy to reform the swirl flow in the hairpin tube 4 after passing through.
- the depth of the groove of the grooved bend tube 51 is shallower than the depth of the groove formed on the inner peripheral surface of the hairpin tube 4. If the groove depth of the grooved bend pipe 51 is shallow, the flow resistance of the refrigerant passing through the grooved bend pipe 51 is reduced, so that the collapse of the swirling flow due to the liquid phase deceleration can be reduced. It becomes easy to recreate the swirl flow in the hairpin tube 4 after passing.
- the number of grooves in the tube axis orthogonal cross section of the grooved bend pipe 51 is equal to or greater than the number of grooves in the tube axis orthogonal cross section of the hairpin tube 4. The greater the number of grooves in the grooved bend pipe 51, the easier the refrigerant passing through the grooved bend pipe 51 forms a swirling flow.
- the number of branch paths 7 is 4 to 8, for example.
- the flow rate of the refrigerant flowing through each branch path 7 is Q / N, where Q is the flow rate of the refrigerant flowing through the main flow path 6 and N is the number of branch paths 7.
- Each branch path 7 includes at least three hairpin tubes 4 and a plurality of return bend tubes 5 that connect the ends of the hairpin tubes 4, and penetrates the fin 2 six times or more.
- the plurality of return bend pipes 5 in each of the plurality of branch paths 7 includes at least one smooth bend pipe 52 having a smooth inner peripheral surface and at least one inner peripheral surface having a plurality of spiral grooves formed therein.
- the at least one smooth bend pipe 52 is located closest to the header 3 when the branch path 7 is traced from the header 3.
- each of the branch paths 7 includes three hairpin tubes 4 and two return bend tubes 5 that connect the ends of the hairpin tubes 4.
- the one return bend pipe 5 positioned closest to the header 3 when the branch path 7 is traced from the header 3 is a smooth bend pipe 52.
- One return bend pipe 5 other than the smooth bend pipe 52 is a grooved bend pipe 51.
- each branch path 7 includes five hairpin tubes 4 and four return bend tubes 5 that connect the ends of the hairpin tubes 4.
- the return bend pipe 5 located closest to the header 3 when the branch path 7 is traced from the header 3 is a smooth bend pipe 52.
- all three return bend pipes 5 other than the smooth bend pipe 52 are grooved bend pipes 51.
- the two return bend pipes 5 are grooved bend pipes 51.
- the return bend pipe 5 is a smooth bend pipe 52.
- the smooth bend pipes 52 in the three return bend pipes 5 other than the smooth bend pipe 52 located closest to the header 3 are located farthest from the header 3 when the branch path 7 is traced from the header 3. is doing.
- the grooved bend pipe 51 may be a grooved bend pipe 51 or a smooth bend pipe 52.
- the number and position of the grooved bend pipe 51 and the smooth bend pipe 52 in the return bend pipe 5 other than the grooved bend pipe 51 can be arbitrarily set.
- one or a plurality of return bend pipes 5 located on the header 3 side among the return bend pipes 5 (that is, the first to n (n is a natural number) when the return bend pipes are counted from the header 3 side).
- the return bend pipe 5) is a smooth bend pipe 52 having a smooth inner peripheral surface, and the remaining return bend pipe 5 is the grooved bend pipe 51 described above.
- the ratio of the smooth bend pipe 52 and the grooved bend pipe 51 in each branch path 7 is determined by the dryness of the refrigerant in the branch path 7.
- the grooved bend pipe 51 is used in an area where the dryness of the refrigerant is 0.8 or less
- the smooth bend pipe 52 is used in an area where the dryness of the refrigerant is larger than 0.8.
- FIG. 3 shows an example of the actual use range of the heat exchanger 1A in the air conditioner.
- the heat exchanger 1A is used as an evaporator during the heating operation, as described above, the flow rate of the refrigerant is large in the main channel 6 on the inlet side of the refrigerant channel 10, and each branch channel 7 on the outlet side of the refrigerant channel 10 is used. Then, the flow rate of the refrigerant is small.
- the refrigerant flows into each branch path 7 in a gas-liquid two-phase state, and receives the heat from the air in the atmosphere, whereby the liquid phase in the refrigerant is gradually vaporized. For this reason, the dryness of the refrigerant increases from the upstream toward the downstream.
- the swirling flow is more easily formed as the amount of the liquid phase is larger. Since the degree of dryness is small on the upstream side of each branch path 7, the amount of the liquid phase is increased, and a swirl flow is easily formed.
- the grooved bend pipe 51 is used for the return bend pipe 5 in the upstream region where a swirling flow that tends to be downstream for a while from the first end of each branch path 7 is easily formed.
- a certain length of pipe length (swirl flow re-forming section) is required until the swirl flow is broken in the return bend pipe 5 and re-formed in the hairpin pipe 4.
- the swirl flow reforming section immediately after the return bend pipe 5 can be made relatively short, so that the heat transfer surface that is the inner wall surface of the hairpin pipe 4 can be made more effective. It can be used and the heat exchange capacity can be increased.
- the groove depth of the grooved bend pipe 51 in the main flow path 6 is preferably shallower than the groove depth of the grooved bend pipe 51 in the branch path 7.
- the main channel 6 not only the flow rate of the refrigerant is large, but also the dryness of the refrigerant is extremely small. That is, since the amount of the liquid phase is large, a swirl flow is easily formed. Therefore, by using the grooved bend pipe 51 having a relatively shallow groove, an increase in pressure loss can be suppressed while maintaining a swirling flow.
- the depth of the grooved bend pipe 51 in the main flow path 6 is the grooved width in the branch path 7. It may be equal to the depth of the groove of the bend pipe 51.
- a smooth bend pipe 52 may be used instead of the grooved bend pipe 51.
- the return bend pipe 5 in the main flow path 6 may be a smooth bend pipe 52 having a smooth inner peripheral surface.
- the return bend pipe 5 positioned farthest from the header 3 is The smooth bend pipe
- all return bend pipes 5 in the main flow path 6 may be smooth bend pipes 52 having a smooth inner peripheral surface. In this case, the overall performance of the refrigeration cycle apparatus is improved by reducing the pressure loss by using the smooth bend pipe 52, rather than by using the grooved bend pipe 51 to make it easier to reform the swirl flow. .
- the main flow path 6 does not necessarily include at least two hairpin tubes 4 and may include only one hairpin tube 4. Moreover, the main flow path 6 does not necessarily need to include the hairpin tube 4 and may be configured by a straight tube so as to penetrate the fin 2 only once.
- the fin tube type heat exchanger 1C which concerns on 2nd Embodiment of this invention is demonstrated.
- the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof may be omitted.
- the inlet (or outlet) of the main channel 6 is arranged on the upper side, but as shown in FIG. 4B, the outlet (or inlet) of the main channel 6 may be arranged on the lower side.
- the flow direction of the refrigerant during the cooling operation is indicated by an arrow.
- a plurality of relay paths 8 are provided between the main flow path 6 and the branch path 7, and the first end of each branch path 7 is connected to the second end of the main flow path 6 via the relay path 8.
- the refrigerant flow path has a path configuration that branches in two stages. Note that some or all of the relay paths 8 may be further branched so that the refrigerant flow path branches in three or more stages.
- the number of relay paths 8 is 3, and the number of branch paths 7 is 6.
- the first ends of all the relay paths 8 are connected to the second ends of the main flow paths 6, and the first ends of the two branch paths 7 are connected to the second ends of the relay paths 8.
- Each relay path 8 includes only one hairpin tube 4 and may pass through the fin 2 twice. Furthermore, each relay path 8 includes at least two hairpin tubes 4 and a return bend tube 5 that connects the ends of the hairpin tubes 4, and may penetrate the fin 2 four times or more. In this case, it is preferable to use a grooved bend pipe 51 as the return bend pipe 5 in each relay path 8.
- the groove depth of the grooved bend pipe 51 in the relay path 8 may be equal to the groove depth of the grooved bend pipe 51 in the branch path 7 or from the depth of the groove of the grooved bend pipe 51 in the branch path 7. Is preferably shallow.
- the main flow path 6 may include at least two hairpin tubes 4 and a return bend tube 5 that connects the ends of the hairpin tubes 4, and may penetrate the fin 2 four times or more.
- the groove depth of the grooved bend pipe 51 in the relay path 8 is the groove depth of the grooved bend pipe 51 in the branch path 7 in the branch path 7.
- the grooved bend pipe 51 having a groove depth equal to or shallower than that of the grooved bend pipe 51 in the branch path 7 is used as the return bend pipe 5 in the main flow path 6. preferable.
- a grooved bend pipe 51 having a groove depth shallower than that of the grooved bend pipe 51 in the branch path 7 and equal to the groove depth of the grooved bend pipe 51 in the relay path 8 may be used.
- a smooth bend tube 52 may be used.
- the smooth bend pipe 52 when used as the return bend pipe in the main flow path 6, some or all of the smooth bend pipes 52 from the upstream side of the return bend pipe 5 in each relay path 8 may be used.
- the swirl flow is formed more easily in the relay path 8 than in the branch path 7, the pressure loss is maintained while the swirl flow is maintained to some extent by using the grooved bend pipe 51 having a relatively shallow groove. To prevent the increase. In the branch path 7, the swirl flow is more difficult to form than the relay path 8. Therefore, the swirl flow is maintained and the heat exchange capacity is increased by using the grooved bend pipe 51 having a relatively deep groove. As in the special configuration, the performance of the refrigeration cycle apparatus can be remarkably improved by optimally arranging the smooth bend pipe 52 and the two types of grooved bend pipes 51 having different groove shapes according to the flow state.
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Abstract
Description
並列された複数のフィンと、
前記複数のフィンを貫通する複数の分岐路と、
前記複数の分岐路のそれぞれの一端が接続されたヘッダと、を備え、
前記複数の分岐路のそれぞれは、内周面に複数の螺旋状の溝が形成された複数のヘアピン管、および前記ヘアピン管の端部同士をつなぐ複数のリターンベンド管を含み、
前記複数の分岐路のそれぞれにおける前記複数のリターンベンド管は、平滑な内周面を有する平滑ベンド管と、複数の螺旋状の溝が形成された内周面を有する溝付ベンド管とを含み、
前記平滑ベンド管は、前記ヘッダから前記分岐路をたどったときに前記ヘッダに最も近いところに位置している、フィンチューブ型熱交換器を提供する。
並列された複数のフィンと、
前記複数のフィンを貫通する複数の分岐路と、
前記複数の分岐路のそれぞれの一端が接続されたヘッダと、を備え、
前記複数の分岐路のそれぞれは、内周面に複数の螺旋状の溝が形成された複数のヘアピン管、および前記ヘアピン管の端部同士をつなぐ複数のリターンベンド管を含み、
前記複数の分岐路のそれぞれにおける前記複数のリターンベンド管は、平滑な内周面を有する平滑ベンド管と、複数の螺旋状の溝が形成された内周面を有する溝付ベンド管とを含み、
前記平滑ベンド管は、前記ヘッダから前記分岐路をたどったときに前記ヘッダに最も近いところに位置している、フィンチューブ型熱交換器を提供する。
図1Aに、本発明の第1実施形態に係るフィンチューブ型熱交換器1Aを示す。この熱交換器1Aは、空気調和装置の室外熱交換器として用いられ、冷媒と空気との間の熱交換を行う。なお、本発明は、例えば給湯機などの他の冷凍サイクル装置に用いられる熱交換器にも適用可能である。
主流路6は、必ずしも少なくとも2本のヘアピン管4を含む必要はなく、ヘアピン管4を1本だけ含んでいてもよい。また、主流路6は、必ずしもヘアピン管4を含んでいる必要はなく、フィン2を一回だけ貫通するようにストレート管で構成されていてもよい。
次に、図4Aを参照して、本発明の第2実施形態に係るフィンチューブ型熱交換器1Cを説明する。なお、本実施形態では、第1実施形態と同一構成部分には同一符号を付し、その説明を省略することがある。なお、図4Aでは、主流路6の入口(又は出口)が上側に配置されていたが、図4Bに示すように、主流路6の出口(又は入口)を下側に配置してもよい。図4Bのフィンチューブ型熱交換器1Dでは、冷房運転時の冷媒の流れ方向を矢印で示している。
Claims (9)
- 並列された複数のフィンと、
前記複数のフィンを貫通する複数の分岐路と、
前記複数の分岐路のそれぞれの一端が接続されたヘッダと、を備え、
前記複数の分岐路のそれぞれは、内周面に複数の螺旋状の溝が形成された複数のヘアピン管、および前記ヘアピン管の端部同士をつなぐ複数のリターンベンド管を含み、
前記複数の分岐路のそれぞれにおける前記複数のリターンベンド管は、平滑な内周面を有する平滑ベンド管と、複数の螺旋状の溝が形成された内周面を有する溝付ベンド管とを含み、
前記平滑ベンド管は、前記ヘッダから前記分岐路をたどったときに前記ヘッダに最も近いところに位置している、フィンチューブ型熱交換器。 - 前記複数の分岐路のそれぞれの他端が直接的にまたは複数の中継路を介して接続された主流路をさらに備え、
前記主流路は、前記複数のフィンを貫通しており、内周面に複数の螺旋状の溝が形成された複数のヘアピン管、および前記ヘアピン管の端部同士をつなぐ複数のリターンベンド管を含み、
前記主流路における前記複数のリターンベンド管は、平滑な内周面を有する平滑ベンド管と、複数の螺旋状の溝が形成された内周面を有する溝付ベンド管とを含み、
前記平滑ベンド管は、前記ヘッダから前記分岐路を介して前記主流路をたどったときに前記ヘッダから最も遠いところに位置している、請求項1に記載のフィンチューブ型熱交換器。 - 前記主流路における前記溝付ベンド管の溝の深さは、前記分岐路における前記溝付ベンド管の溝の深さよりも浅い、請求項2に記載のフィンチューブ型熱交換器。
- 前記中継路は、前記複数のフィンを貫通しており、内周面に複数の螺旋状の溝が形成された複数のヘアピン管、および前記ヘアピン管の端部同士をつなぐリターンベンド管を含み、
前記中継路における前記リターンベンド管は、複数の螺旋状の溝が形成された内周面を有する溝付ベンド管であり、
前記中継路における前記溝付ベンド管の溝の深さは、前記分岐路における前記溝付ベンド管の溝の深さよりも浅い、請求項2に記載のフィンチューブ型熱交換器。 - 前記複数の分岐路のそれぞれの他端が直接的にまたは複数の中継路を介して接続された主流路をさらに備え、
前記主流路は、前記複数のフィンを貫通しており、内周面に複数の螺旋状の溝が形成された複数のヘアピン管、および前記ヘアピン管の端部同士をつなぐリターンベンド管を含み、
前記主流路における前記リターンベンド管は、平滑な内周面を有する平滑ベンド管である、請求項1に記載のフィンチューブ型熱交換器。 - 前記複数の分岐路の前記ヘアピン管は、少なくとも3本で構成される、請求項1に記載のフィンチューブ型熱交換器。
- 前記溝付ベンド管の溝のリード角は、前記ヘアピン管の内周面に形成された溝のリード角と等しいかそれ未満である、請求項1に記載のフィンチューブ型熱交換器。
- 前記溝付ベンド管の溝の深さは、前記ヘアピン管の内周面に形成された溝の深さよりも浅い、請求項1に記載のフィンチューブ型熱交換器。
- 前記溝付ベンド管の管軸直交断面の溝数は、前記ヘアピン管の管軸直交断面の溝数以上である、請求項1に記載のフィンチューブ型熱交換器。
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Cited By (4)
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WO2015132968A1 (ja) * | 2014-03-07 | 2015-09-11 | 三菱電機株式会社 | 冷凍サイクル装置 |
EP3002537A1 (en) * | 2014-09-29 | 2016-04-06 | Mitsubishi Heavy Industries, Ltd. | Radiator and refrigerating cycle device |
JP2017036900A (ja) * | 2015-08-13 | 2017-02-16 | 三菱重工業株式会社 | 放熱器およびそれを用いた超臨界圧冷凍サイクル |
WO2017042940A1 (ja) * | 2015-09-10 | 2017-03-16 | ジョンソンコントロールズ ヒタチ エア コンディショニング テクノロジー (ホンコン) リミテッド | 熱交換器 |
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CN106871496B (zh) * | 2017-04-01 | 2019-12-31 | 青岛海尔空调器有限总公司 | 室内换热器和空调器 |
KR20190040625A (ko) | 2017-10-11 | 2019-04-19 | 한국철도기술연구원 | 3d 프린팅 기법으로 제작된 열교환기 및 이의 제조방법 |
KR102186154B1 (ko) * | 2019-07-09 | 2020-12-03 | 엘지전자 주식회사 | 열교환기 및 열교환기의 제조방법 |
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KR20140106552A (ko) | 2014-09-03 |
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