JP2005024187A - Outdoor heat exchanger for heat pump - Google Patents

Outdoor heat exchanger for heat pump Download PDF

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Publication number
JP2005024187A
JP2005024187A JP2003190940A JP2003190940A JP2005024187A JP 2005024187 A JP2005024187 A JP 2005024187A JP 2003190940 A JP2003190940 A JP 2003190940A JP 2003190940 A JP2003190940 A JP 2003190940A JP 2005024187 A JP2005024187 A JP 2005024187A
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JP
Japan
Prior art keywords
heat exchanger
corrugated
fin
corrugated fin
outdoor heat
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.)
Pending
Application number
JP2003190940A
Other languages
Japanese (ja)
Inventor
Keiichi Murata
Kenzo Shimizu
Tsutomu Shimizu
Takashi Sugio
Soichi Tsujimura
Shigeto Yamaguchi
Shoichi Yokoyama
成人 山口
孝 杉尾
敬一 村田
昭一 横山
努 清水
憲三 清水
惣一 辻村
Original Assignee
Matsushita Electric Ind Co Ltd
松下電器産業株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Ind Co Ltd, 松下電器産業株式会社 filed Critical Matsushita Electric Ind Co Ltd
Priority to JP2003190940A priority Critical patent/JP2005024187A/en
Publication of JP2005024187A publication Critical patent/JP2005024187A/en
Pending legal-status Critical Current

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Abstract

A parallel flow heat exchanger having a conventional configuration has a problem that frost grows at the leading edge of a louver, causing rapid frost formation and lowering of heating performance as compared with a fin without a louver.
In a parallel flow type heat pump outdoor heat exchanger, a through hole is provided in a joint portion between a corrugated fin and a flat tube.
[Selection] Figure 1

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a parallel flow type heat pump outdoor heat exchanger such as a room air conditioner and a packaged air conditioner.
[0002]
[Prior art]
A parallel flow heat exchanger in which multiple flat tubes and corrugated fins arranged in parallel are alternately stacked in the direction perpendicular to the ventilation, and each end of each flat tube is connected to a pair of hollow headers is condensed. Since it is intended for use as an air conditioner, that is, when the air conditioner is used for cooling, no consideration is given to frost formation and defrosting. FIG. 3 is a perspective view of the whole heat pump outdoor heat exchanger, and FIG. 4 is an enlarged view of a part thereof. Corrugated fins 2 thermally connected to the flat tubes are sandwiched between a large number of flat tubes 1 arranged in parallel. The ventilation direction depth TD of the flat tube 1 and the ventilation direction depth FD of the corrugated fin 2 are the same, and both ends are aligned. The corrugated fin 2 is provided with a louver 3 having the same shape although the direction of inclination is reversed between the upstream side and the downstream side.
[0003]
The ventilating air 4 flows between the corrugated fins 2 and flows through the gaps of the louvers 3 and releases the cold heat (or hot heat) of the ventilating air as it passes through the corrugated fins 2. Is transmitted to the evaporative medium 6 flowing in the small holes 5. A small unevenness may be provided on the inner surface of the small hole 5 to promote heat transfer. The flow direction of the evaporative medium 6 is opposite to the direction M illustrated in FIG. 4 in the case of the air-conditioner cooling operation, and is the direction M illustrated in the case of the heating operation. Both ends of the flat tube 1 arranged in parallel are connected to the upper and lower hollow headers 11, which form the entrance / exit of the evaporative medium 6. End plates 12 are attached to the left and right ends of the heat exchanger to protect the corrugated fins 2 (see, for example, Patent Document 1).
[0004]
[Patent Document 1]
Japanese Examined Patent Publication No. 3-45300
[Problems to be solved by the invention]
However, the conventional configuration has the following problems.
[0006]
That is, when the air conditioner is in a heating operation, the ventilation air 4 sent to the outdoor heat exchanger is cold, and the flat tube 1 operates as an evaporator, and the latent heat of condensation from the ventilation air 4 via the corrugated fins 2. Therefore, the ventilation air 4 is gradually cooled while passing between the corrugated fins 2. For this reason, the water vapor possessed by the air becomes supersaturated, and when the wall surface temperature of the flat tube 1 and the corrugated fin 2 is 0 ° C. or lower, the supersaturated water vapor becomes frost on these wall surfaces and grows with time. Eventually the air passage is blocked.
[0007]
Thus, when frost formation progresses to some extent, the heating performance is reduced, so the defrosting operation is performed by reversing the refrigerant. When the defrosting operation is started, the frost on the surface of the flat tube and the corrugated fin melts and flows downward through the louver provided on the corrugated fin.
[0008]
However, in the conventional configuration, since the louver is provided on the corrugated fin, frost grows on the leading edge of the louver, leading to a rapid progress of frost formation and a decrease in heating performance as compared with the fin without the louver. There were drawbacks. However, if there was no louver, the condensed water would not flow down, so the louver could not be lost.
[0009]
An object of the present invention is to provide a parallel flow type heat pump outdoor heat exchanger that reliably discharges water remaining on the fin surface during heating and defrosting to the outside of the heat exchanger and does not cause rapid frosting. It is to provide.
[0010]
[Means for Solving the Problems]
In order to achieve this object, in a parallel flow type heat pump outdoor heat exchanger in which a plurality of flat tubes and corrugated fins arranged in parallel are alternately stacked in a direction perpendicular to the ventilation, the corrugated fin corrugated The valley line and the ridge line in the heat exchanger depth direction, and a valley shape with the center in the depth direction of the heat exchanger as the bottom, a through hole is provided at the bottom of the valley and at the junction with the flat tube of the corrugated fin .
[0011]
This configuration provides a parallel flow heat pump outdoor heat exchanger that reliably discharges water remaining on the fin surface during heating and defrosting to the outside of the heat exchanger and that does not cause rapid frosting. .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0013]
(Embodiment 1)
1 and 3 are a partial perspective view and an overall perspective view, respectively, showing Embodiment 1 of the present invention.
[0014]
In the outdoor heat exchanger for heat pump, corrugated fins 2 thermally connected to the flat tubes are sandwiched between a number of flat tubes 1 arranged in parallel. Each flat tube 1 is erected in the vertical direction, and the ventilation direction depth TD of the flat tube 1 and the ventilation direction depth FD of the corrugated fin 2 are the same, and both ends are aligned. The corrugated fin 2 has a corrugated trough line and a ridge line in the depth direction of the heat exchanger and a valley shape with the center in the depth direction of the heat exchanger as the bottom.
[0015]
Further, a through-hole 13 is provided at the junction between the corrugated fin 2 and the flat tube 1 at the bottom of the valley. The through hole 13 has a substantially semicircular shape whose diameter is a joint line between the corrugated fin 2 and the flat tube 1.
[0016]
Both ends of the flat tube 1 arranged in parallel are connected to the upper and lower hollow headers 11, which form the entrance / exit of the evaporative medium 6. End plates 12 are attached to the left and right ends of the heat exchanger to protect the corrugated fins 2.
[0017]
While the ventilation air 4 passes through the corrugated fins 2, it efficiently transmits the heat (or cold energy) of the ventilation air and heats the evaporative medium 6 flowing through the numerous small holes 5 provided in the flat tube 1. (Or cool). A small unevenness is provided on the inner surface of the small hole 5 to promote heat transfer. In the heating operation of the air conditioner, the evaporable medium 6 is heated and evaporated, and flows in the direction indicated by M in FIG.
[0018]
In the air-conditioner heating operation, dew is attached to the heat exchanger, but the dew condensation water attached on the corrugated fins 2 passes through the through holes 13 provided in the joint portions of the corrugated fins 2 with the flat tubes 1 and sequentially downwards. run down.
[0019]
In the present embodiment, the corrugated fin 2 has a corrugated fin 2 having a corrugated valley line and a ridge line in the depth direction of the heat exchanger and a valley shape having the center in the depth direction of the heat exchanger as the bottom. Since the through-hole 13 is provided in the joint with the tube 1, water condensed on the fin wind upper end or the wind lower end far from the center in the depth direction of the heat exchanger is also reliably transferred along the fin inclination. It flows toward the center of the direction and can be surely drawn into the through hole 13.
[0020]
In the air conditioner heating operation under the condition of frost formation, frost is formed on the corrugated fins 2 of the heat exchanger and the wind passage is narrowed. As a result, the ventilation resistance is increased, the air flow of the blower is decreased, and the heat exchanger The vigorous cycle of capacity and temperature drop and further frost growth is repeated, and finally the wind passage is almost blocked. Under such circumstances, the heating capacity is also greatly reduced.
[0021]
Normally, the corrugated fin 2 of this type of heat exchanger is provided with a louver 3 as shown in FIG. 4, but if the louver 3 is present, frost grows thick on the leading edge of the louver. The time during which the wind passage is narrowed is greatly shortened, and the heating capacity is greatly reduced in a short time, and the defrosting operation is started and the feeling of heating is impaired.
[0022]
However, in this embodiment, even without the louver 3 that promotes frost formation and impairs the feeling of heating, the dew condensation water can flow through the through-hole 13 as described above. Since the molten water passes through the through hole 13 and flows down along the tube and is discharged out of the heat exchanger, there is no risk of freezing.
[0023]
(Embodiment 2)
FIG. 2 is a partial perspective view showing Embodiment 2 of the present invention. In FIG. 2, the same components as those in FIG.
[0024]
In FIG. 2, a guide groove 14 extending from each location on the corrugated fin 2 toward the through hole 13 is provided.
[0025]
According to this configuration, during normal heating operation or defrosting operation under frost generation conditions, the water on the fin surface is guided to the guide groove 14 on the corrugated fin 2 and more reliably guided to the through hole 13. Because it flows down along the tube and is discharged outside the heat exchanger, there is no risk of freezing.
[0026]
In each of the above embodiments, the ventilation direction depth TD of the flat tube 1 and the ventilation direction depth FD of the corrugated fin 2 are the same and both ends are aligned. However, the ventilation direction depth TD of the flat tube 1 is the corrugated fin 2. It may be larger or smaller than the ventilation direction depth FD, and the effect of the present invention is not impaired even if both positions are shifted in the ventilation direction.
[0027]
In each of the above embodiments, since a flat tube is used, even if the tube thickness is the same, the tube diameter is small, so that the pressure resistance is large. A heat exchanger of the form is effective.
[0028]
Further, since the volume of the flat tube is small, the amount of refrigerant can be reduced, and the heat exchanger of each of the above embodiments is effective when HC refrigerant or the like that is a flammable refrigerant is used.
[0029]
【The invention's effect】
As described above, according to the parallel flow type heat pump outdoor heat exchanger of the present invention, the corrugated fin corrugated valley line and ridge line are in the heat exchanger depth direction, and the heat exchanger depth direction center is the bottom. As a trough shape, through holes are provided at the bottom of the corrugated fin and the flat tube of the corrugated fin, so that water remaining on the fin surface during heating and defrosting can be reliably removed from the heat exchanger. It is possible to provide an outdoor heat exchanger for a heat pump that is exhausted to a low temperature and does not cause rapid frosting.
[Brief description of the drawings]
FIG. 1 is a partial perspective view of an outdoor heat exchanger for a heat pump according to Embodiment 1 of the present invention. FIG. 2 is a partial perspective view of an outdoor heat exchanger for a heat pump according to Embodiment 2 of the present invention. FIG. 4 is a partial perspective view of a conventional parallel flow type heat pump outdoor heat exchanger. FIG. 4 is a partial perspective view of a conventional parallel flow type heat pump outdoor heat exchanger.
DESCRIPTION OF SYMBOLS 1 Flat tube 2 Corrugated fin 3 Louver 4 Ventilation air 5 Small hole in flat tube 6 Evaporable medium 11 Hollow header 12 End plate 13 Through-hole 14 Guide groove

Claims (5)

  1. In a parallel flow heat pump outdoor heat exchanger in which a plurality of flat tubes and corrugated fins arranged in parallel are alternately stacked in a direction perpendicular to the ventilation direction, a through-hole is formed at a joint portion of the corrugated fin with the flat tube. The outdoor heat exchanger for heat pumps characterized by providing.
  2. The outdoor heat exchanger for a heat pump according to claim 1, wherein the shape of the through hole is a substantially semicircular shape in which a joint portion with the flat tube of the corrugated fin is a straight portion.
  3. The corrugated fin corrugated fins and ridges in the depth direction of the heat exchanger, and the bottom of the central portion in the depth direction of the heat exchanger, the bottom portion of the corrugated fin and the flat tube of the corrugated fin The outdoor heat exchanger for a heat pump according to claim 1, wherein a through hole is provided in the outdoor heat exchanger.
  4. The outdoor heat exchanger for a heat pump according to claim 1, wherein a louver is not provided in the corrugated fin.
  5. The heat pump outdoor heat exchanger according to claim 4, wherein a guide groove extending from each place on the fin toward the through hole is provided on the corrugated fin.
JP2003190940A 2003-07-03 2003-07-03 Outdoor heat exchanger for heat pump Pending JP2005024187A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003190940A JP2005024187A (en) 2003-07-03 2003-07-03 Outdoor heat exchanger for heat pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003190940A JP2005024187A (en) 2003-07-03 2003-07-03 Outdoor heat exchanger for heat pump

Publications (1)

Publication Number Publication Date
JP2005024187A true JP2005024187A (en) 2005-01-27

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100676634B1 (en) 2004-11-17 2007-02-02 주식회사 동성기연 Cooling fin for heat exchanger
WO2009044593A1 (en) 2007-10-04 2009-04-09 Sharp Kabushiki Kaisha Heat exchanger
WO2009057364A1 (en) 2007-11-02 2009-05-07 Sharp Kabushiki Kaisha Heat exchanger
JP2009204279A (en) * 2008-02-29 2009-09-10 Nippon Light Metal Co Ltd Heat exchanger
CN101975492A (en) * 2010-10-19 2011-02-16 广东美的制冷设备有限公司 Novel heat exchanging device
JP2013113480A (en) * 2011-11-28 2013-06-10 Kobe Steel Ltd Heat pump apparatus
JP2013174398A (en) * 2012-02-27 2013-09-05 Japan Climate Systems Corp Heat exchanger
WO2013183136A1 (en) * 2012-06-07 2013-12-12 株式会社日立製作所 Air heat exchanger
US8790454B2 (en) 2011-04-05 2014-07-29 Korea Institute Of Science And Technology Heat exchanger having dehumidifying liquid and dehumidifier having the same
WO2016013100A1 (en) * 2014-07-25 2016-01-28 三菱電機株式会社 Heat exchanger and air-conditioning and refrigerating apparatus with heat exchanger

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100676634B1 (en) 2004-11-17 2007-02-02 주식회사 동성기연 Cooling fin for heat exchanger
WO2009044593A1 (en) 2007-10-04 2009-04-09 Sharp Kabushiki Kaisha Heat exchanger
WO2009057364A1 (en) 2007-11-02 2009-05-07 Sharp Kabushiki Kaisha Heat exchanger
JP2009204279A (en) * 2008-02-29 2009-09-10 Nippon Light Metal Co Ltd Heat exchanger
CN101975492A (en) * 2010-10-19 2011-02-16 广东美的制冷设备有限公司 Novel heat exchanging device
US8790454B2 (en) 2011-04-05 2014-07-29 Korea Institute Of Science And Technology Heat exchanger having dehumidifying liquid and dehumidifier having the same
JP2013113480A (en) * 2011-11-28 2013-06-10 Kobe Steel Ltd Heat pump apparatus
JP2013174398A (en) * 2012-02-27 2013-09-05 Japan Climate Systems Corp Heat exchanger
WO2013183136A1 (en) * 2012-06-07 2013-12-12 株式会社日立製作所 Air heat exchanger
JP5799382B2 (en) * 2012-06-07 2015-10-28 日立アプライアンス株式会社 Air heat exchanger
US9534827B2 (en) 2012-06-07 2017-01-03 Johnson Controls-Hitachi Air Conditioning Technology (Hong Kong) Limited Air heat exchanger
WO2016013100A1 (en) * 2014-07-25 2016-01-28 三菱電機株式会社 Heat exchanger and air-conditioning and refrigerating apparatus with heat exchanger
JPWO2016013100A1 (en) * 2014-07-25 2017-04-27 三菱電機株式会社 HEAT EXCHANGER AND AIR CONDITIONING REFRIGERATOR HAVING THE HEAT EXCHANGER

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