WO2023152790A1 - 熱交換器 - Google Patents

熱交換器 Download PDF

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Publication number
WO2023152790A1
WO2023152790A1 PCT/JP2022/004868 JP2022004868W WO2023152790A1 WO 2023152790 A1 WO2023152790 A1 WO 2023152790A1 JP 2022004868 W JP2022004868 W JP 2022004868W WO 2023152790 A1 WO2023152790 A1 WO 2023152790A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat exchanger
drain pan
projection
protrusion
fins
Prior art date
Application number
PCT/JP2022/004868
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
萌々 稲村
達郎 永山
綾 河島
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2023579884A priority Critical patent/JPWO2023152790A1/ja
Priority to PCT/JP2022/004868 priority patent/WO2023152790A1/ja
Publication of WO2023152790A1 publication Critical patent/WO2023152790A1/ja

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/22—Means for preventing condensation or evacuating condensate

Definitions

  • the present disclosure relates to heat exchangers with drain pans.
  • Patent Document 1 there is a drain pan that has projections that are hemispherical projections arranged in a grid pattern (see Patent Document 1, for example).
  • Patent Document 1 the drainage performance of the drain pan is improved by causing the drain water that has fallen into the drain pan to gather in the troughs of the drain pan along the projections on the hemispherical surface.
  • the present disclosure has been made in view of the above circumstances, and aims to improve drainage of condensed water on the drain pan and suppress corrosion of the heat transfer tubes and fins of the heat exchanger.
  • a heat exchanger includes heat transfer tubes through which a refrigerant flows, fins provided on the heat transfer tubes, and arranged below the heat transfer tubes or the fins to store condensed water from the heat transfer tubes and the fins. and a drain pan, the drain pan having a projection projecting upward, and the fin being provided above the projection and having a slit for guiding the condensed water to the projection of the drain pan.
  • the fins have slits provided above the protrusions.
  • the slit guides the condensed water to the projection of the drain pan. Condensed water comes into contact with the projections and flows along the sides of the projections, effectively maintaining the horizontal velocity of the condensed water on the drain pan. As a result, condensed water is less likely to remain in the drain pan, and corrosion of the heat transfer tubes and fins of the heat exchanger is suppressed.
  • FIG. 1 is a refrigerant circuit diagram showing a schematic configuration of an air conditioner according to Embodiment 1.
  • FIG. FIG. 2 is a perspective view of the indoor heat exchanger shown in FIG. 1;
  • FIG. 2 is a side view of a conventional indoor heat exchanger with a fixing plate removed;
  • FIG. 4 is a schematic cross-sectional view of the indoor heat exchanger shown in FIG. 3 taken along line AA.
  • FIG. 10 is a diagram showing how condensed water falls into a drain pan having a conventional structure;
  • Fig. 2 is a side view of the indoor heat exchanger with the fixing plate removed according to the first embodiment;
  • FIG. 4 is a diagram showing how condensed water drops onto the drain pan of the indoor heat exchanger according to Embodiment 1;
  • FIG. 2 is a side view of an indoor heat exchanger having fins provided with slits in the heat exchanger according to Embodiment 1;
  • FIG. 10 is a schematic vertical cross-sectional view of an indoor heat exchanger according to Embodiment 2;
  • FIG. 10 is a schematic cross-sectional view of the drain pan taken along the line BB in FIG. 9;
  • FIG. 10 is a schematic cross-sectional view of the drain pan at the BB position in FIG. 9 of the indoor heat exchanger according to Embodiment 3;
  • FIG. 10 is a schematic cross-sectional view of the protrusion according to the first example of Embodiment 4, taken along line CC of FIG. 9;
  • FIG. 10 is a schematic cross-sectional view of a projection according to a second example of Embodiment 4, taken along line CC in FIG. 9;
  • FIG. 10 is a schematic cross-sectional view of a projection according to a third example of Embodiment 4, taken along line CC in FIG. 9;
  • FIG. 11 is a side cross-sectional view of an indoor heat exchanger according to Embodiment 5;
  • FIG. 1 is a refrigerant circuit diagram showing a schematic configuration of an air conditioner 100 according to Embodiment 1.
  • FIG. 1 is a refrigerant circuit diagram showing a schematic configuration of an air conditioner 100 according to Embodiment 1.
  • the air conditioner 100 includes a compressor 1, a muffler 2, a four-way valve 3, an outdoor heat exchanger 4, a capillary tube 5, a strainer 6, and an electronically controlled
  • a refrigerant circuit is provided in which the expansion valve 7, the stop valve 8a, the stop valve 8b, the indoor heat exchanger 9, and the auxiliary muffler 10 are connected by a refrigerant pipe 16.
  • the indoor heat exchanger 9 of the air conditioner 100 is provided with a control unit 11 that controls actuators such as the compressor 1 and the electronically controlled expansion valve 7 based on the temperatures of the outside air, the room, the refrigerant, and the like. It is The four-way valve 3 described above is a valve for switching the flow of refrigerant in the refrigeration cycle between cooling and heating, and is controlled by the controller 11 .
  • the refrigerant is compressed by the compressor 1 into a high-temperature and high-pressure gas refrigerant, which flows through the four-way valve 3 to the outdoor heat exchanger 4 .
  • the high-temperature, high-pressure gas refrigerant that has flowed into the outdoor heat exchanger 4 exchanges heat (radiates heat) with the outdoor air passing through the outdoor heat exchanger 4, and flows as a high-pressure liquid refrigerant.
  • the high-pressure liquid refrigerant flowing out of the outdoor heat exchanger 4 is decompressed by the capillary tube 5 and the electronically controlled expansion valve 7 to become a low-pressure gas-liquid two-phase refrigerant and flows into the indoor heat exchanger 9 .
  • the gas-liquid two-phase refrigerant that has flowed into the indoor heat exchanger 9 flows into the indoor heat exchanger 9 .
  • the gas-liquid two-phase refrigerant that has flowed into the indoor heat exchanger 9 exchanges heat with the indoor air passing through the indoor heat exchanger 9 and is drawn into the compressor 1 as a low-temperature, low-pressure gas refrigerant.
  • the refrigerant is compressed by the compressor 1 in the same manner as described above and becomes a high-temperature and high-pressure gas refrigerant. flow.
  • the high-temperature and high-pressure gas refrigerant that has flowed into the indoor heat exchanger 9 undergoes heat exchange with the indoor air passing through the indoor heat exchanger 9 and becomes a high-pressure liquid refrigerant.
  • the high-pressure liquid refrigerant flowing out of the indoor heat exchanger 9 is decompressed by the electronically controlled expansion valve 7 and the capillary tube 5 , becomes a low-pressure gas-liquid two-phase refrigerant, and flows to the outdoor heat exchanger 4 .
  • the low-pressure gas-liquid two-phase refrigerant that has flowed to the outdoor heat exchanger 4 is heat-exchanged with the outdoor air passing through the outdoor heat exchanger 4 and sucked into the compressor 1 as a low-temperature, low-pressure gas refrigerant.
  • FIG. 2 is a perspective view of the indoor heat exchanger 9 shown in FIG. Here, for the sake of simplification, it is shown with the resin holder removed.
  • the indoor heat exchanger 9 shown in FIG. 2 is, for example, a fin-and-tube heat exchanger.
  • the indoor heat exchanger 9 has a plurality of fins 12 , fixing plates 13 , heat transfer tubes 14 and holders 17 .
  • a plurality of fins 12 are provided on the heat transfer tube 14 and stacked in parallel at regular intervals.
  • the material of the fins 12 is aluminum, for example.
  • the fixing plate 13 is arranged outside the plurality of fins 12 in the stacking direction.
  • the material of the fixing plate 13 is, for example, aluminum or iron.
  • a coolant flows inside the heat transfer tube 14 .
  • the heat transfer tubes 14 are vertically inserted into the plurality of stacked fins 12 and the fixed plate 13 .
  • the end portion of the heat transfer tube 14 is bent in a U shape, and this U-shaped portion is called a hairpin bent portion 14a.
  • a material of the heat transfer tube 14 is, for example, copper.
  • a hairpin bent portion 14 a of the heat transfer tube 14 is inserted into the holder 17 .
  • Holder 17 protects the side surface of indoor heat exchanger 9 .
  • the material of the holder 17 is resin, for example.
  • a heat insulating foaming agent 18 is filled between the fixed plate 13, the holder 17, and the hairpin bent portion 14a of the heat transfer tube 14, and the fixed plate 13, the holder 17, and the hairpin bent portion 14a of the heat transfer tube 14 are closely attached.
  • close contact means a state in which the heat transfer tube 14, the fixing plate 13, and the heat insulating foaming agent 18 are in contact with each other without any gap.
  • FIG. 3 is a side view of the conventional indoor heat exchanger 9 with the fixing plate 13 removed.
  • the indoor heat exchanger 9 has a line flow fan 19 and a drain pan 20 .
  • the line flow fan 19 sends air for heat exchange to the indoor heat exchanger 9 .
  • the drain pan 20 is provided below the indoor heat exchanger 9 .
  • FIG. 4 is a schematic cross-sectional view of the indoor heat exchanger 9 shown in FIG. 3 taken along line AA.
  • a drain pan 20 is arranged below the indoor heat exchanger 9 . Condensed water that has traveled through the indoor heat exchanger 9 drops into the drain pan 20 . The condensed water that has fallen into the drain pan 20 gathers inside the drain pan 20 and is drained to the drain hose 21. - ⁇
  • a drain hose 21 for discharging condensed water that has fallen into the drain pan 20 is provided at either one of the left and right ends of the drain pan 20 . Which of the left and right ends of the drain pan 20 is provided with the drain hose 21 is determined when the indoor heat exchanger 9 is actually arranged in the room. difficult. Also, the drain pan 20 generally has a structure without irregularities. Therefore, the condensed water that has fallen into the drain pan 20 only spreads isotropically and tends to remain in the drain pan 20 because there is no driving force to flow toward the drain hose 21 .
  • FIG. 5 is a diagram showing how the condensed water falls into the drain pan 20 having a conventional structure.
  • the condensed water 22 that has fallen spreads isotropically and has a shape similar to the isotropically spread condensed water 22 .
  • the isotropically spreading condensed water 22 lacks the driving force to flow toward the drain hose 21 and tends to remain on the drain pan 20 .
  • the heat transfer tubes 14 and the fins 12 of the indoor heat exchanger 9 are likely to corrode, as described above.
  • FIG. 6 is a side view of the indoor heat exchanger 9 with the fixing plate 13 removed according to the first embodiment.
  • the drain pan 20 is provided with projections 24 .
  • a single projection 24 may be used, but a plurality of projections 24 is more effective.
  • the shape of the protrusion 24 will be described later in Embodiment 4, but in FIG. 6 it is represented as a triangular pyramid shape.
  • FIG. 7 is a diagram showing how condensed water falls to the drain pan 20 of the indoor heat exchanger 9 according to the first embodiment. As shown in FIG. 7, the falling condensed water 22 contacts the apex or slope of the projection 24, and at the time of contact, it has kinetic energy due to the falling speed and potential energy at the contact height.
  • the condensed water 22 runs down the slope of the projection 24 and reaches the drain pan 20, the condensed water 22 has a horizontal velocity.
  • the horizontal direction referred to here corresponds to the left-right direction of the paper surface and the depth direction of the paper surface in FIG.
  • the condensed water reaching the drain pan 20 tends to aggregate and flow toward the drain hose 21. Therefore, it becomes difficult for dew condensation water to remain in the drain pan 20, and corrosion of the heat transfer tubes 14 and the fins 12 of the indoor heat exchanger 9 can be suppressed.
  • the slit 25 is provided above the projection 24 and guides the condensed water 22 to the projection 24 of the drain pan 20 .
  • the condensed water flows through the grooves of the slits 25 , making it easier for the condensed water 22 to fall toward the projections 24 .
  • the condensed water 22 comes into contact with the projections 24 and effectively has a horizontal velocity on the drain pan 20 , so that the condensed water 22 is less likely to remain in the drain pan 20 .
  • corrosion of the heat transfer tubes 14 and the fins 12 of the indoor heat exchanger 9 can be suppressed.
  • the shape of the slit 25 is not particularly limited, it may have a shape in which a portion of the fin 12 is recessed, or may have a groove shape in which a portion of the fin 12 is cut off.
  • the number of slits 25 is not particularly limited. It is desirable that the slits 25 be provided directly above the protrusions 24 , and more preferably directly above the vertices of the protrusions 24 . Note that when a plurality of protrusions 24 are provided, the slits 25 may not be provided above all the protrusions 24 , and the slits 25 may be provided above only some of the protrusions 24 . Moreover, all of the plurality of slits 25 may not be arranged above the protrusion 24 , and some of the slits 25 may be provided at positions separated from above the protrusion 24 .
  • the same material as that of the drain pan 20 may be used, or a different material may be used.
  • Another material is, for example, a general resin material or a ceramic material.
  • a metal material it is not desirable because the protrusion 24 itself may corrode.
  • the fins 12 have the slits 25 provided above the protrusions 24 .
  • the slit 25 guides the condensed water to the projection 24 of the drain pan 20 .
  • the condensed water contacts the projections 24 and flows along the sides of the projections 24, effectively maintaining the horizontal velocity of the condensed water on the drain pan 20. - ⁇ As a result, condensed water is less likely to remain in the drain pan 20, and corrosion of the heat transfer tubes 14 and fins 12 of the heat exchanger is suppressed.
  • the corrosion of the heat transfer tubes 14 and the fins 12 of the indoor heat exchanger 9 is suppressed, thereby providing the indoor heat exchanger 9 with a longer life. can be done.
  • a feature of the drain pan 20 of the indoor heat exchanger 9 according to Embodiment 2 is the configuration of the flat portion 20_1 around the projection 24 on the drain pan 20 .
  • FIG. 9 is a schematic vertical cross-sectional view of the indoor heat exchanger 9 according to Embodiment 2.
  • FIG. FIG. 9 shows a case where the drain pan 20 of FIG. 4 is changed to the drain pan 20 provided with the projections 24 according to the second embodiment.
  • a plurality of protrusions 24 are provided on the drain pan 20 below the indoor heat exchanger 9 .
  • a plurality of protrusions 24 are integrally formed on the bottom of the drain pan 20 .
  • FIG. 10 is a schematic cross-sectional view showing the BB cross section of FIG.
  • the protrusion 24 of this embodiment is a quadrangular pyramid.
  • the portion without projections 24 that is, the flat portion 20_1 of the drain pan 20 has a grid-like structure with walls 31 formed by the side surfaces of the projections 24 .
  • the water in contact with the protrusions 24 has a horizontal flow velocity when it reaches the drain pan 20 .
  • the flat portion 20_1 which is the flow path on the drain pan 20, is grid-like, the drain water is easily collected, and the flow velocity of the water can be increased more than in the first embodiment. Therefore, the water on the drain pan 20 is easily drained to the drain hose 21, so that less water remains in the drain pan 20, and corrosion of the heat transfer tubes 14 and the fins 12 of the indoor heat exchanger 9 can be suppressed.
  • Embodiment 3 is characterized in that the size of the protrusion 24 differs depending on the position on the drain pan 20 . Embodiment 3 will be described with reference to FIG. 11 .
  • 11 is a schematic cross-sectional view of the drain pan 20 taken along the line BB in FIG. 9 of the indoor heat exchanger 9 according to Embodiment 3.
  • FIG. 11 is a schematic cross-sectional view of the drain pan 20 taken along the line BB in FIG. 9 of the indoor heat exchanger 9 according to Embodiment 3.
  • Embodiment 3 since condensed water easily falls directly under the indoor heat exchanger 9, the size of the projecting structure in this portion is increased. As shown in FIG. 11, projections 24 are provided in a matrix on the drain pan 20 .
  • the protrusion 24 has a large protrusion 24_1 as the first protrusion and a small protrusion 24_2 as the second protrusion.
  • large protrusions 24_1 which are the first protrusions, are formed on the top line of the paper and the bottom line of the paper.
  • the indoor heat exchanger 9 is positioned directly above the large protrusion 24_1.
  • small projections 24_2, which are second projections smaller than the large projections 24_1, are formed in other rows, the second and third rows in the third embodiment.
  • the size of the large projection 24_1 is different from the size of the small projection 24_2.
  • the large projection 24_1 is located on the drain pan 20 directly below the fins 12 or the heat transfer tubes 14, and the small projection 24_2 is located on the drain pan 20 not directly below the fins 12 or the heat transfer tubes 14.
  • the size of the large protrusion 24_1 is larger than the size of the small protrusion 24_2.
  • the size of the surface of the large projection 24_1 in contact with the bottom of the drain pan 20 is larger than the size of the surface of the small projection 24_2 in contact with the bottom of the drain pan 20 .
  • the height of the large protrusion 24_1 from the bottom of the drain pan 20 may be higher than the height of the small protrusion 24_2 from the bottom of the drain pan 20 .
  • the indoor heat exchanger 9 of the third embodiment can discharge water more effectively than the indoor heat exchanger 9 of the first embodiment.
  • the projections 24 have two sizes, but the projections 24 may have three or more sizes. Moreover, although FIG. 11 shows that the projections 24 arranged in one row (horizontal direction of the paper) have the same size, the projections 24 arranged in one row may have different sizes. Further, FIG. 11 shows an example in which the number of columns of the protrusions 24, that is, the number of protrusions 24 arranged in the horizontal direction of the paper surface is the same for all rows, but the number of columns of the protrusions 24 may differ depending on the row. .
  • Embodiment 4 modifications of the protrusions 24 shown in Embodiments 1, 2, and 3 will be described.
  • FIG. 12 is a schematic cross-sectional view of the protrusion 24 according to the first example of Embodiment 4, taken along line CC in FIG.
  • FIG. 12 shows a projection 24 having a semicircular longitudinal cross-sectional shape.
  • the bottom surface of this projection 24 may be circular or rectangular.
  • FIG. 13 is a schematic cross-sectional view of the protrusion 24 according to the second example of Embodiment 4, taken along line CC in FIG.
  • the bottom surface of this projection 24 may be circular or rectangular.
  • FIG. 14 is a schematic cross-sectional view of the protrusion 24 according to the third example of Embodiment 4, taken along line CC in FIG.
  • the bottom surface of this projection 24 may be circular or rectangular.
  • the shape of the protrusion 24 is not limited to the triangular pyramid shape shown in FIG. 7, and can be selected from various shapes in terms of ease of molding and cost.
  • the shape of the projections 24 formed on one drain pan 20 does not need to be the same, and may have a configuration in which a plurality of shapes are mixed.
  • the size of the protrusion 24 the protrusion 24 of a plurality of sizes may be mixed.
  • the effects of the fourth embodiment are similar to the effects described in the first, second and third embodiments.
  • Embodiment 5 The protrusions 24 on the drain pan 20 may be molded directly onto the drain pan 20 as shown in the first, second, third and fourth embodiments. In Embodiment 5, the projection 24 on the drain pan 20 is provided detachably from the drain pan 20 .
  • FIG. 15 is a side cross-sectional view of the indoor heat exchanger 9 according to Embodiment 5.
  • the drain pan 20 and the projection 24 are separate members.
  • a sheet 26 is laid on the drain pan 20 .
  • a protrusion 24 is formed on the sheet 26 .
  • the material of the sheet 26 is not particularly limited, resin materials and ceramic materials can be used.
  • the sheet 26 on which the projections 24 are formed is detachable from the drain pan 20 .

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices For Blowing Cold Air, Devices For Blowing Warm Air, And Means For Preventing Water Condensation In Air Conditioning Units (AREA)
PCT/JP2022/004868 2022-02-08 2022-02-08 熱交換器 WO2023152790A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2023579884A JPWO2023152790A1 (enrdf_load_stackoverflow) 2022-02-08 2022-02-08
PCT/JP2022/004868 WO2023152790A1 (ja) 2022-02-08 2022-02-08 熱交換器

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/004868 WO2023152790A1 (ja) 2022-02-08 2022-02-08 熱交換器

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WO2023152790A1 true WO2023152790A1 (ja) 2023-08-17

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PCT/JP2022/004868 WO2023152790A1 (ja) 2022-02-08 2022-02-08 熱交換器

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JP (1) JPWO2023152790A1 (enrdf_load_stackoverflow)
WO (1) WO2023152790A1 (enrdf_load_stackoverflow)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5152552U (enrdf_load_stackoverflow) * 1974-10-21 1976-04-21
JPS6373039A (ja) * 1986-09-17 1988-04-02 Hitachi Ltd 空気調和機
JPH1068534A (ja) * 1996-08-26 1998-03-10 Toshiba Corp 空気調和機

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5152552U (enrdf_load_stackoverflow) * 1974-10-21 1976-04-21
JPS6373039A (ja) * 1986-09-17 1988-04-02 Hitachi Ltd 空気調和機
JPH1068534A (ja) * 1996-08-26 1998-03-10 Toshiba Corp 空気調和機

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JPWO2023152790A1 (enrdf_load_stackoverflow) 2023-08-17

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