heat exchanger

Abstract

This heat exchanger comprises: a heat exchanger tube through which a refrigerant flows; a fin that is provided in the heat exchanger tube; and a drain pan that is disposed below the heat exchanger tube or the fin, and stores dew condensation water from the heat exchanger tube and the fin. The drain pan has a protrusion that protrudes upward. The fin is disposed above the protrusion and has a slit for leading dew condensation water to the protrusion of the drain pan.

Description

[Technical Field]

[0001] The present disclosure relates to a heat exchanger having a drain pan. [Background technology]

[0002] If condensed water is left in the drain pan for a long period of time, the heat transfer tubes and fins of the heat exchanger located above the drain pan will corrode, and if the corrosion is severe, it may lead to refrigerant leakage and the air conditioning system will no longer function.

[0003] One solution to this problem is to provide a drain pan with protrusions, which are semi-spherical protrusions arranged in a grid pattern (see, for example, Patent Document 1). In Patent Document 1, drain water that falls into the drain pan is collected in the valleys of the drain pan along the protrusions on the semi-spherical surface, thereby improving the drainage performance of the drain pan. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 10-110962 Summary of the Invention [Problem to be solved by the invention]

[0005] However, with the drain pan shown in Patent Document 1, if debris or the like accumulates in even one valley of the drain pan, the drain water will no longer flow. In such cases, water may be more likely to stagnate than in a drain pan with a general structure without protrusions, and the problem of corrosion of the heat transfer tubes and fins of the heat exchanger cannot be solved.

[0006] The present disclosure has been made in consideration of the above-described circumstances, and aims to improve the drainage of condensation water on a drain pan and suppress corrosion of the heat transfer tubes and fins of a heat exchanger. [Means for solving the problem]

[0007] The heat exchanger of the present disclosure comprises a heat transfer tube through which a refrigerant flows, fins provided on the heat transfer tube, and a drain pan arranged below the heat transfer tube or the fins and configured to collect condensation water from the heat transfer tube and the fins, the drain pan having protrusions protruding upward, the fins being provided above the protrusions and having slits for directing the condensation water to the protrusions of the drain pan, the heat exchanger having a plurality of protrusions, each of which has a flat portion around it, and the flat portion having a lattice-like structure with walls formed by the side portions of the protrusions. A heat exchanger according to the present disclosure includes a heat transfer tube through which a refrigerant flows, fins provided on the heat transfer tube, and a drain pan disposed below the heat transfer tube or the fins and configured to collect condensation water from the heat transfer tube and the fins, the drain pan having a protrusion protruding upward, the fin being provided above the protrusion and having a slit for guiding the condensation water to the protrusion of the drain pan, The protrusion has a first protrusion and a second protrusion, the size of the first protrusion depends on the position on the drain pan where the first protrusion is provided, and the size of the second protrusion depends on the position on the drain pan where the second protrusion is provided, and the size of the first protrusion and the size of the second protrusion are different. [Effects of the Invention]

[0008] According to the present disclosure, the fins have slits above the protrusions. The slits guide condensation water to the protrusions of the drain pan. The condensation water comes into contact with the protrusions and flows down the sides of the protrusions, effectively maintaining a horizontal velocity on the drain pan. This reduces the amount of condensation water remaining in the drain pan and suppresses corrosion of the heat transfer tubes and fins of the heat exchanger. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a refrigerant circuit diagram showing a schematic configuration of an air conditioner according to a first embodiment. [Figure 2] FIG. 2 is a perspective view of the indoor heat exchanger shown in FIG. [Figure 3] FIG. 10 is a side view of a conventional indoor heat exchanger with a fixing plate removed. [Figure 4] 4 is a cross-sectional view schematically illustrating the indoor heat exchanger shown in FIG. 3 along the line AA. [Figure 5]FIG. 10 is a diagram showing condensed water falling into a drain pan with a conventional structure. [Figure 6] 1 is a side view of the indoor heat exchanger according to the first embodiment with the fixing plate removed. FIG. [Figure 7] 5 is a diagram showing a state in which condensed water falls into a drain pan of the indoor heat exchanger according to the first embodiment. FIG. [Figure 8] 1 is a side view of an indoor heat exchanger having fins with slits of a heat exchanger according to a first embodiment. FIG. [Figure 9] FIG. 6 is a schematic vertical cross-sectional view of an indoor heat exchanger according to a second embodiment. [Figure 10] FIG. 10 is a cross-sectional schematic view of the drain pan taken along the line BB in FIG. 9 . [Figure 11] 10 is a cross-sectional schematic view of a drain pan of an indoor heat exchanger according to a third embodiment, taken along the line BB in FIG. 9 . [Figure 12] 10 is a cross-sectional view of a protrusion according to a first example of embodiment 4 taken along the line CC in FIG. 9. FIG. [Figure 13] 10 is a cross-sectional view of a projection according to a second example of the fourth embodiment taken along the line CC in FIG. 9. FIG. [Figure 14] 10 is a cross-sectional view of a protrusion according to a third example of the fourth embodiment, taken along the line CC in FIG. 9. FIG. [Figure 15] FIG. 10 is a cross-sectional side view of an indoor heat exchanger according to a fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] An air conditioning apparatus having a heat exchanger according to an embodiment will be described below with reference to the drawings. In the drawings, identical components are denoted by the same reference numerals, and repeated description will be provided only when necessary. The present disclosure may include any combination of possible configurations among those described in the following embodiments. Furthermore, the dimensional relationships between the components in the drawings may differ from the actual relationships. Furthermore, the configurations of the components shown in the entire specification are merely examples and are not limited to the configurations described in the specification. In particular, the combinations of the components are not limited to the combinations in each embodiment, and components described in other embodiments may be applied to other embodiments.

[0011] Embodiment 1. FIG. 1 is a refrigerant circuit diagram showing a schematic configuration of an air conditioner 100 according to the first embodiment.

[0012] As shown in FIG. 1, the air conditioning apparatus 100 according to the first embodiment is provided with a refrigerant circuit including a compressor 1, a muffler 2, a four-way valve 3, an outdoor heat exchanger 4, a capillary tube 5, a strainer 6, an electronically controlled expansion valve 7, a stop valve 8a, a stop valve 8b, an indoor heat exchanger 9, and an auxiliary muffler 10, all connected by refrigerant piping 16.

[0013] The indoor heat exchanger 9 of this 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, etc. The four-way valve 3 mentioned above is a valve for switching the flow of refrigerant in the refrigeration cycle between cooling and heating, and is controlled by the control unit 11.

[0014] When the four-way valve 3 is switched to cooling mode by the control unit 11, the refrigerant is compressed by the compressor 1 to become a high-temperature, 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 flows into the outdoor heat exchanger 4 exchanges heat (dissipates 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 that flows out of the outdoor heat exchanger 4 is decompressed by the capillary tube 5 and the electronically controlled expansion valve 7 and becomes a low-pressure two-phase gas-liquid refrigerant that flows into the indoor heat exchanger 9. The two-phase gas-liquid refrigerant that flows into the indoor heat exchanger 9 also flows into the indoor heat exchanger 9. The two-phase gas-liquid refrigerant that flows into the indoor heat exchanger 9 exchanges heat with the indoor air passing through the indoor heat exchanger 9 and becomes a low-temperature, low-pressure gas refrigerant that is drawn into the compressor 1.

[0015] Furthermore, when the control unit 11 switches the four-way valve 3 to heating, the refrigerant is compressed by the compressor 1 in the same manner as described above, becoming a high-temperature, high-pressure gas refrigerant, and flows to the indoor heat exchanger 9 via the four-way valve 3. The high-temperature, high-pressure gas refrigerant that flows into the indoor heat exchanger 9 exchanges heat with the indoor air passing through the indoor heat exchanger 9, becoming a high-pressure liquid refrigerant. The high-pressure liquid refrigerant that flows out of the indoor heat exchanger 9 is decompressed by the electronically controlled expansion valve 7 and the capillary tube 5, becoming a low-pressure two-phase gas-liquid refrigerant, and flows to the outdoor heat exchanger 4. The low-pressure two-phase gas-liquid refrigerant that flows into the outdoor heat exchanger 4 exchanges heat with the outdoor air passing through the outdoor heat exchanger 4, becoming a low-temperature, low-pressure gas refrigerant, and is drawn into the compressor 1.

[0016] Next, the configuration of the indoor heat exchanger 9 according to the first embodiment will be described. FIG. 2 is a perspective view of the indoor heat exchanger 9 shown in FIG. 1. For simplicity, the indoor heat exchanger 9 is shown without the resin holder. 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, a fixing plate 13, a heat transfer tube 14, and a holder 17.

[0017] The multiple fins 12 are provided on the heat transfer tubes 14 and are stacked in parallel at regular intervals. The fins 12 are made of, for example, aluminum. The fixing plate 13 is disposed on the outer side of the multiple fins 12 in the stacking direction. The fixing plate 13 is made of, for example, aluminum or iron. A refrigerant flows through the heat transfer tubes 14. The heat transfer tubes 14 are inserted perpendicularly between the stacked multiple fins 12 and the fixing plate 13. The end of the heat transfer tube 14 is bent into a U-shape, and this U-shaped portion is referred to as a hairpin bent portion 14a. The heat transfer tubes 14 are made of, for example, copper. The hairpin bent portion 14a of the heat transfer tube 14 is inserted into a holder 17. The holder 17 protects the side surface of the indoor heat exchanger 9. The holder 17 is made of, for example, resin.

[0018] The insulating foaming agent 18 is filled between the fixing plate 13, the holder 17, and the hairpin bent portion 14a of the heat transfer tube 14, and these fixing plate 13, the holder 17, and the hairpin bent portion 14a of the heat transfer tube 14 are in close contact with each other. Here, "close contact" means that the heat transfer tube 14, the fixing plate 13, and the insulating foaming agent 18 are in contact with each other with no gaps between them.

[0019] Fig. 3 is a side view of a conventional indoor heat exchanger 9 with a fixing plate 13 removed. As shown in Fig. 3, 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.

[0020] Fig. 4 is a schematic cross-sectional view taken along line AA of the indoor heat exchanger 9 shown in Fig. 3. As shown in Fig. 4, a drain pan 20 is disposed below the indoor heat exchanger 9. Condensation water that has flowed down the indoor heat exchanger 9 falls into the drain pan 20. The condensation water that has fallen into the drain pan 20 is collected in the drain pan 20 and is then discharged into a drain hose 21.

[0021] Typically, a drain hose 21 for draining condensation water that has fallen into the drain pan 20 is provided at either the left or right end of the drain pan 20. Whether the drain hose 21 is provided on the left or right end of the drain pan 20 is determined when the indoor heat exchanger 9 is actually placed in the room, so it is difficult to manufacture the drain pan 20 with the drain hose 21 tilted in advance toward the drain hose 21. Furthermore, the drain pan 20 generally has a smooth structure. Therefore, condensation water that has fallen into the drain pan 20 simply spreads isotropically, and since there is no driving force to flow toward the drain hose 21, it tends to remain in the drain pan 20.

[0022] 5 is a diagram showing condensed water falling onto a drain pan 20 having a conventional structure. As shown in FIG. 5, because the drain pan 20 has no unevenness, the condensed water 22 that falls spreads isotropically and assumes a shape similar to that of isotropically spread condensed water 22. Because the drain pan 20 is not tilted, the isotropically spread condensed water 22 lacks the driving force to flow toward the drain hose 21, and tends to remain on the drain pan 20. As a result, the heat transfer tubes 14 and fins 12 of the indoor heat exchanger 9 are susceptible to corrosion, as described above.

[0023] Fig. 6 is a side view of the indoor heat exchanger 9 with the fixing plate 13 removed according to the first embodiment. As shown in Fig. 6, a protrusion 24 is provided on the drain pan 20. Although a single protrusion 24 may be provided, it is more effective to provide multiple protrusions 24. The shape of the protrusion 24 will be described later in the fourth embodiment, but in Fig. 6 it is shown as a triangular pyramid.

[0024] Fig. 7 is a diagram showing how condensed water falls into the drain pan 20 of the indoor heat exchanger 9 according to embodiment 1. As shown in Fig. 7, the falling condensed water 22 comes into contact with the apex or slope of the protrusion 24, and at the point of contact, it has kinetic energy due to the falling speed and potential energy at the height of contact.

[0025] Therefore, when the condensed water 22 reaches the bottom of the slope of the protrusion 24 and flows into the drain pan 20, the condensed water 22 has a horizontal velocity. The horizontal direction here corresponds to the left-right direction and the depth direction of the paper in FIG. 7.

[0026] As a result of the condensed water 22 having a horizontal velocity, the condensed water that reaches the drain pan 20 tends to condense and flow toward the drain hose 21. Therefore, the 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 indoor heat exchanger 9 can be suppressed.

[0027] In order for the condensed water 22 to have an effective horizontal velocity on the drain pan 20, the condensed water 22 needs to fall toward the protrusions 24. To make it easier for the condensed water 22 to fall toward the protrusions 24, some or all of the fins 12 of the indoor heat exchanger 9 may have vertical slits 25 on their surfaces. Figure 8 is a side view of the indoor heat exchanger 9 according to the first embodiment, which has fins 12 with slits 25 formed therein.

[0028] Slits 25 are provided above protrusions 24 and guide condensed water 22 to protrusions 24 of drain pan 20. By providing slits 25, condensed water flows through the grooves of slits 25, making it easier for condensed water 22 to fall toward protrusions 24.

[0029] As a result, the condensed water 22 comes into contact with the protrusions 24, and the condensed water 22 effectively has a horizontal velocity on the drain pan 20, making it difficult for the condensed water 22 to remain in the drain pan 20. As a result, corrosion of the heat transfer tubes 14 and fins 12 of the indoor heat exchanger 9 can be suppressed.

[0030] The shape of the slits 25 is not particularly limited, but may be a shape in which a recess is provided in a part of the fin 12, or a groove shape in which a part of the fin 12 is cut away. The number of slits 25 is also not particularly limited. The slits 25 are preferably provided directly above the protrusions 24, and more preferably directly above the apex of the protrusions 24. Note that when multiple protrusions 24 are provided, the slits 25 do not have to be provided above all of the protrusions 24, and the slits 25 may be provided only above some of the protrusions 24. Furthermore, not all of the multiple slits 25 need to be located above the protrusions 24, and some of the slits 25 may be located at positions away from above the protrusions 24.

[0031] The material of the protrusions 24 may be the same as that of the drain pan 20, or a different material may be used. Examples of such a different material include a general resin material or a ceramic material. Although it is possible to use a metal material, this is not desirable because the protrusions 24 themselves may corrode.

[0032] Therefore, in the indoor heat exchanger 9 according to the first embodiment, the fins 12 have slits 25 provided above the protrusions 24. The slits 25 guide condensed water to the protrusions 24 of the drain pan 20. The condensed water comes into contact with the protrusions 24 and flows along the sides of the protrusions 24, effectively maintaining a horizontal velocity of the condensed water on the drain pan 20. This makes it difficult for condensed water to remain in the drain pan 20, and inhibits corrosion of the heat transfer tubes 14 and fins 12 of the heat exchanger.

[0033] Furthermore, according to the indoor heat exchanger 9 according to the first embodiment, corrosion of the heat transfer tubes 14 and the fins 12 of the indoor heat exchanger 9 is suppressed, and therefore, an indoor heat exchanger 9 with a longer lifespan can be provided.

[0034] Embodiment 2. The drain pan 20 of the indoor heat exchanger 9 according to the second embodiment is characterized in the configuration of the flat portion 20_1 around the protrusion 24 on the drain pan 20.

[0035] Fig. 9 is a schematic vertical cross-sectional view of the indoor heat exchanger 9 according to the second embodiment. Fig. 9 shows a case where the drain pan 20 of Fig. 4 is changed to a drain pan 20 provided with protrusions 24 according to the second embodiment. As shown in Fig. 9, a plurality of protrusions 24 are provided on the drain pan 20 below the indoor heat exchanger 9. The plurality of protrusions 24 are integrally molded on the bottom of the drain pan 20.

[0036] Fig. 10 is a cross-sectional schematic diagram showing the cross section BB of Fig. 9. The protrusions 24 in this embodiment are quadrangular pyramids. As shown in Fig. 10, in the second embodiment, the portion without the protrusions 24, i.e., the flat portion 20_1 of the drain pan 20, has a lattice-like structure due to walls 31 formed by the side portions of each protrusion 24.

[0037] As described above, water that has come into contact with the protrusions 24 has a horizontal flow velocity when it reaches the drain pan 20. In the second embodiment, the flat portion 20_1, which is the flow path on the drain pan 20, is formed in a lattice pattern, which makes it easier for the drain water to collect and makes it possible to further increase the water flow velocity compared to the first embodiment. Therefore, the water on the drain pan 20 is more easily drained into the drain hose 21, which reduces the amount of water remaining in the drain pan 20 and suppresses corrosion of the heat transfer tubes 14 and fins 12 of the indoor heat exchanger 9.

[0038] Embodiment 3. The third embodiment is characterized in that the size of the protrusions 24 varies depending on the position on the drain pan 20. The third embodiment will be described with reference to Fig. 11. Fig. 11 is a cross-sectional schematic diagram of the drain pan 20 of the indoor heat exchanger 9 according to the third embodiment, taken at position BB in Fig. 9.

[0039] In the third embodiment, the size of the protrusion structure is increased in the area directly below the indoor heat exchanger 9 because condensation water is likely to fall in this area. As shown in Fig. 11, protrusions 24 are provided in a matrix on the drain pan 20.

[0040] The protrusion 24 has a large protrusion 24_1 which is a first protrusion and a small protrusion 24_2 which is a second protrusion.

[0041] 11, large protrusions 24_1, which are first protrusions, are formed on the top row and the bottom row of the paper. The indoor heat exchanger 9 is located directly above the large protrusions 24_1. In addition, small protrusions 24_2, which are second protrusions smaller than the large protrusions 24_1, are formed on the other rows, that is, the second and third rows in the third embodiment.

[0042] The size of the large protrusion 24_1, which is the first protrusion, depends on the position where the large protrusion 24_1 is provided on the drain pan 20, and the size of the small protrusion 24_2, which is the second protrusion, depends on the position where the small protrusion 24_2 is provided on the drain pan 20. The size of the large protrusion 24_1 and the size of the small protrusion 24_2 are different.

[0043] The large protrusion 24_1 is located on the drain pan 20 directly below the fins 12 or the heat transfer tubes 14, and the small protrusion 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.

[0044] Specifically, the size of the surface of the large protrusion 24_1 that contacts the bottom of the drain pan 20 is larger than the size of the surface of the small protrusion 24_2 that contacts the bottom of the drain pan 20. In addition, the height of the large protrusion 24_1 from the bottom of the drain pan 20 may be larger than the height of the small protrusion 24_2 from the bottom of the drain pan 20.

[0045] Because the large protrusions 24_1 are larger than the small protrusions 24_2, the potential energy of the condensation water 22 when it comes into contact with the large protrusions 24_1 is larger than the potential energy of the condensation water 22 when it comes into contact with the small protrusions 24_2, and the distance it travels down the slope of the large protrusions 24_1 becomes longer. This makes it possible to increase the flow rate of the condensation water 22 that comes into contact with the large protrusions 24_1 when it reaches the bottom of the drain pan 20. Therefore, the indoor heat exchanger 9 of the third embodiment can discharge water more effectively than the indoor heat exchanger 9 of the first embodiment.

[0046] As a result, condensation water is less likely to remain in the drain pan 20, and corrosion of the heat transfer tubes 14 and fins 12 of the indoor heat exchanger 9 can be suppressed. In Fig. 11, the protrusions 24 are shown to have two different sizes, but the protrusions 24 may have three or more different sizes. Also, in Fig. 11, the protrusions 24 lined up in a row (left to right on the page) are all shown to have the same size, but the protrusions 24 lined up in a row may have different sizes. Also, in Fig. 11, an example is shown in which the number of columns of the protrusions 24, i.e., the number of protrusions 24 lined up in the left to right direction on the page, is the same for all rows, but the number of columns of the protrusions 24 may differ depending on the row.

[0047] Embodiment 4. In the fourth embodiment, a modification of the protrusion 24 shown in the first, second and third embodiments will be described.

[0048] Fig. 12 is a cross-sectional schematic view of a protrusion 24 according to a first example of embodiment 4, taken along the CC line in Fig. 9. Fig. 12 shows the protrusion 24 having a semicircular cross-sectional shape. The bottom surface of the protrusion 24 may be circular or rectangular.

[0049] Fig. 13 is a cross-sectional schematic view of a protrusion 24 according to a second example of embodiment 4, taken along the line CC in Fig. 9. The bottom surface of this protrusion 24 may be circular or rectangular.

[0050] Fig. 14 is a cross-sectional schematic view of a protrusion 24 according to a third example of embodiment 4, taken along the line CC in Fig. 9. The bottom surface of this protrusion 24 may be circular or rectangular.

[0051] As shown in FIGS. 12, 13 and 14, the shape of the protrusions 24 is not limited to the triangular pyramid shape shown in FIG. 7, and various shapes can be selected in terms of ease of molding and cost.

[0052] Furthermore, the shapes of the protrusions 24 formed on one drain pan 20 do not need to be the same, and a configuration in which a plurality of shapes are mixed may be used. Also, the sizes of the protrusions 24 may be a configuration in which a plurality of sizes of protrusions 24 are mixed. The effects of the fourth embodiment are similar to those described in the first, second, and third embodiments.

[0053] Embodiment 5. The protrusions 24 on the drain pan 20 may be molded directly on the drain pan 20, as shown in embodiments 1, 2, 3, and 4. In embodiment 5, the protrusions 24 on the drain pan 20 are provided so as to be detachable from the drain pan 20.

[0054] Fig. 15 is a cross-sectional side view of the indoor heat exchanger 9 according to the fifth embodiment. In the fifth embodiment, the drain pan 20 and the protrusions 24 are separate members. As shown in Fig. 15, a sheet 26 is placed on the drain pan 20. The protrusions 24 are formed on the sheet 26. The material of the sheet 26 is not particularly limited, but a resin material or a ceramic material can be used.

[0055] In the fifth embodiment, the sheet 26 on which the protrusions 24 are formed is detachable from the drain pan 20. With this configuration, for example, during repairs, periodic maintenance, and cleaning, the sheet 26 on which the protrusions 24 are formed can be replaced, thereby making it possible to keep the drain pan 20 clean.

[0056] The embodiments are presented as examples and are not intended to limit the scope of the claims. The embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the embodiments. These embodiments and their modifications are included in the scope and spirit of the embodiments. [Explanation of symbols]

[0057] 1 compressor, 2 muffler, 3 four-way valve, 4 outdoor heat exchanger, 5 capillary tube, 6 strainer, 7 electronically controlled expansion valve, 8a, 8b stop valve, 9 indoor heat exchanger, 10 auxiliary muffler, 11 control unit, 12 fin, 13 fixing plate, 14 heat transfer tube, 14a hairpin bend section, 16 refrigerant tube, 17 resin holder, 18 insulating foam material, 19 line flow fan, 20 drain pan, 20_1 flat section, 21 drain hose, 22 condensation water, 23 spread condensation water, 24 protrusion, 24_1 large protrusion, 24_2 small protrusion, 25 slit, 26 sheet, 31 wall, 100 air conditioning unit.

Claims

1. a heat transfer tube through which a refrigerant flows; fins provided on the heat transfer tube; a drain pan disposed below the heat transfer tube or the fin, for collecting condensation water from the heat transfer tube and the fin; Equipped with The drain pan has a protrusion that protrudes upward, The fins are a slit provided above the protrusion for guiding the condensed water to the protrusion of the drain pan; The projections are provided in a plurality, and a flat portion is provided around each projection, The flat portion has a lattice-like structure with walls formed by the side surfaces of the protrusions. heat exchanger.

2. a heat transfer tube through which a refrigerant flows; fins provided on the heat transfer tube; a drain pan disposed below the heat transfer tube or the fin, for collecting condensation water from the heat transfer tube and the fin; Equipped with The drain pan has a protrusion that protrudes upward, The fins are a slit provided above the protrusion for guiding the condensed water to the protrusion of the drain pan; The protrusion includes a first protrusion and a second protrusion, The size of the first protrusion depends on the position on the drain pan where the first protrusion is provided, The size of the second protrusion depends on the position on the drain pan where the second protrusion is provided, The size of the first protrusion is different from the size of the second protrusion. heat exchanger.

3. The first protrusion is Located directly below the fin or the heat transfer tube, The second protrusion is Located on the drain pan not directly below the fin or the heat transfer tube, The size of the first protrusion is larger than the size of the second protrusion.

3. The heat exchanger of claim 2.

4. The protrusion is removable from the drain pan. The heat exchanger according to any one of claims 1 to 3.

5. A sheet is placed on the drain pan, The protrusions are formed on the sheet.

5. The heat exchanger according to claim 4.

6. The protrusion is integrally molded on the bottom of the drain pan. The heat exchanger according to any one of claims 1 to 3.

7. The protrusion is a cone. The heat exchanger according to any one of claims 1 to 6.

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