Air supply device and heat exchange ventilation system equipped therewith

Abstract

To suppress dropping of dew condensation water generated in the vicinity of an indoor side air supply port that is an outlet of an air supply air course.SOLUTION: An air supply device or a heat exchange type ventilation device 1 includes a front louver 8, an indoor casing 2, and an air supply air blower 4. The indoor casing 2 includes an outer louver part 11, a water reception inclined part 65, and a drain pan part 67. The outer louver part 11 includes a guide part 63. The guide part 63 includes a terminal part 62b. The drain pan part 67 includes a corner part 67a and a bottom surface 67b. An air supply terminal air course 18 that is a terminal portion of an air supply air course 81 is formed between the front louver 8 and the outer louver part 11. The terminal part 62b is provided in a most downstream part of the air supply terminal air course 18. The water reception inclined part 65 is located immediately below the terminal part 62b and is inclined so that dew condensation water generated in the terminal part 62b is guided to the bottom surface 67b through the corner part 67a.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to an air supply device and a heat exchange type ventilator that performs ventilation while exchanging heat between outdoor air and indoor air via a duct communicating between the outdoors and the room. Background Art

[0002] Conventionally, as this type of heat exchange type ventilator, a heat exchange type ventilator of a type that has a heat exchange element inside and exchanges heat between indoor air and outdoor air to reduce energy loss of indoor environment caused by ventilation is known (see, for example, Patent Document 1).

[0003] Hereinafter, the heat exchange type ventilator will be described with reference to FIG. 7.

[0004] This heat exchange type ventilator includes a box body 101, a supply / exhaust blower 110, a double-layer pipe 106, and a heat exchanger 105.

[0005] The box body 101 is attached to an inner wall 120 of a building, and divides the interior into an exhaust passage 121 and an air supply passage 122.

[0006] The supply / exhaust blower 110 is composed of an exhaust impeller 102 and a supply impeller 103 respectively fixed to ends of coaxial rotating shafts projecting to both end sides from a single electric motor 104.

[0007] The exhaust impeller 102 and the supply impeller 103 are arranged closer to one side in the box body so as to overlap toward the building inner wall 120, and the heat exchanger 105 is arranged closer to the other side.

[0008] Supply air passes through the air supply passage 122, exchanges heat with exhaust air in the heat exchanger 105, and then is supplied into the room from the air supply port 107. Prior Art Documents Patent Documents

[0009] [Patent Document 1] Japanese Utility Model Publication No. 57-46732 [Overview of the Initiative] [Problems that the invention aims to solve]

[0010] In conventional heat exchange ventilation systems, when the outside air temperature is low and the temperature of the supply air after passing through the heat exchanger falls below the dew point temperature of the indoor air, the area near the air intake is directly cooled by the supply air, causing the main body wall to fall below the dew point temperature of the indoor air. Then, due to the airflow of the supply air, indoor air is drawn to the area near the air intake, and condensation occurs on the surface of the box near the air intake, where the indoor air temperature has fallen below the dew point temperature of the supply air. Subsequently, the condensation on the surface of the box turns into liquid droplets, and a problem arises in that these droplets drip from the heat exchange ventilation system.

[0011] Therefore, the present invention aims to solve the above-mentioned conventional problems and to provide an air supply device or heat exchange ventilation device that can suppress the dripping of condensation water generated near the indoor air supply port of the main unit. [Means for solving the problem]

[0012] To achieve this objective, an air supply device according to one aspect of the present invention is an air supply device comprising a front louver, an indoor housing, and an air supply blower, wherein the indoor housing includes an outer louver section, a water receiving inclined section, and a drain pan section, and the air supply blower supplies air from the outdoors to the indoors. An air intake passage is formed through which air is blown. The outer louver section includes a guide section, the guide section includes an end section, and the drain pan section includes a corner section and a bottom surface. Between the front louver and the outer louver section, an air intake termination passage, which is the end of the air intake passage, is formed. The end section is located at the downstream end of the air intake termination passage, and the water receiving inclined section is located directly below the end section and is inclined so that condensation water generated at the end section is guided through the corner section to the bottom surface. This achieves the intended purpose. [Effects of the Invention]

[0013] According to the present invention, the dripping of condensation water can be suppressed. [Brief explanation of the drawing]

[0014] [Figure 1] Overall perspective view of the heat exchange ventilation system, Embodiment 1 of the present invention. [Figure 2] Cross-sectional view showing the component configuration of a heat exchange ventilation system. [Figure 3] (a) Cross-sectional view showing the indoor enclosure, (b) Enlarged cross-sectional view showing the air supply terminal duct. [Figure 4] Enlarged cross-sectional view showing the air intake flow [Figure 5] Overall perspective view showing the airflow discharged from the indoor air intake vent. [Figure 6] (a) Cross-sectional perspective view showing the drain pan, (b) Cross-sectional perspective view showing the drain pan from a different angle than Figure 6(a) [Figure 7] Cross-sectional view showing the component configuration of a conventional heat exchange ventilation system. [Modes for carrying out the invention]

[0015] An air supply device according to one aspect of the present invention is an air supply device comprising a front louver, an indoor housing, and an air supply blower, wherein the indoor housing includes an outer louver section, a water receiving inclined section, and a drain pan section, the air supply blower forms an air supply air passage through which air is supplied from outdoors to indoors, the outer louver section includes a guide section, the guide section includes an end section, the drain pan section includes a corner section and a bottom surface, an air supply terminal air passage which is the end portion of the air supply air passage is formed between the front louver and the outer louver section, the end section is provided at the downstream end of the air supply terminal air passage, the water receiving inclined section is located directly below the end section and is inclined so that condensation water generated at the end section is guided through the corner section to the bottom surface.

[0016] Accordingly, when the outside air temperature is low and the supply air temperature is equal to or lower than the dew point temperature of indoor air, condensed water generated at a terminal portion can be guided to a drain pan portion located on an inner side relative to the terminal portion, thereby suppressing dripping of condensed water. That is, dripping of condensed water generated in the vicinity of the indoor-side air supply port, which is the outlet of the air supply duct, can be suppressed.

[0017] Further, a heat exchange type ventilation device according to an aspect of the present invention is a heat exchange type ventilation device provided with an air supply device, comprising: an exhaust blower; and a heat exchange element, wherein the exhaust blower is provided downstream of the heat exchange element in an indoor housing and forms an exhaust air passage through which air is blown from the room to the outdoors; the indoor housing includes a back surface, a first side surface, and a second side surface; the back surface is installed on a wall surface of the room; the first side surface has an indoor-side exhaust port that is an inlet of the exhaust air passage; the second side surface is located on a surface facing the first side surface; the heat exchange element is provided at a position adjacent to the indoor-side exhaust port and at a position where the supply air passage and the exhaust air passage intersect each other; and the water receiving inclined portion is provided on the second side surface side.

[0018] Accordingly, when the outside air temperature is low and the supply air temperature is equal to or lower than the dew point temperature of indoor air, the temperature of supply air that has exchanged heat on the exhaust-side downstream side of the heat exchange element and is discharged from the second side surface side is lower than the temperature of supply air that has exchanged heat on the exhaust-side upstream side of the heat exchange element and is discharged from the first side surface side. By providing the water receiving inclined portion on the second side surface side where the supply air temperature is lower, dripping of condensed water can be effectively suppressed.

[0019] Further, the configuration may be such that the water receiving inclined portion is not provided on the first side surface side.

[0020] When the outside air temperature is low, the temperature of supply air that has exchanged heat on the upstream side of the exhaust side of the heat exchange element discharged from the first side surface is higher than the temperature of supply air that has exchanged heat on the downstream side of the exhaust side of the heat exchange element discharged from the second side surface. Therefore, when the outside air temperature drops, dew condensation occurs earlier on the second side surface than on the first side surface. Even if the water receiving inclined portion is not provided on the first side surface, by providing the water receiving inclined portion on the second side surface, dripping of condensed water can be suppressed in the entire apparatus.

[0021] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0022] (Embodiment 1) As shown in Fig. 1 and Fig. 2, the heat exchange type ventilator 1 includes an indoor housing 2, a duct 3, an outdoor hood 10, and a front louver 8.

[0023] The indoor housing 2 is installed on the side of a room 21, and performs supply of air to the room 21 and exhaust of indoor air.

[0024] The outdoor hood 10 is installed on the side of the outdoors 22, and performs exhaust to the outdoors 22 and supply of air to indoor space.

[0025] The duct 3 has, for example, a hollow cylindrical outer shell, and is attached inside a through hole 25 provided in a wall surface 20. The duct 3 connects an indoor-side end portion having a circular cross section to the indoor housing 2, and connects an outdoor-side end portion having a circular cross section to the outdoor hood 10.

[0026] Thereby, the duct 3 is sandwiched and connected between the indoor housing 2 and the outdoor hood 10, and connects the supply air duct and the exhaust air duct respectively.

[0027] In this way, the heat exchange type ventilator 1 is installed on the wall surface 20, forms a supply air duct 81 and an exhaust air duct 82, and performs supply and exhaust between the room 21 and the outdoors 22.

[0028] The outdoor hood 10 has, for example, a box-shaped outer casing, with its rear end fixed to the wall surface 20, and is connected to the duct 3 in the installed state, connecting the air supply passage 81 and the exhaust passage 82.

[0029] The outdoor hood 10 is equipped with an outdoor air intake port 33 and an outdoor exhaust port 34 on any of the sides and top and bottom surfaces of the housing when it is installed on the wall surface 20.

[0030] The outdoor air intake port 33 is located in a place that communicates with the air intake passage 81, and the outdoor exhaust port 34 is located in a place that communicates with the exhaust passage 82.

[0031] Since the outdoor hood 10 is a component that prevents wind, rain, and coarse dust from entering the room 21 from the outdoors 22, it is desirable that the outdoor air intake 33 and the outdoor exhaust 34 have a large number of narrow slit-shaped openings combined to secure the opening area.

[0032] The duct 3 has a partition plate 9 and an air supply fan 4 inside a hollow cylindrical structure.

[0033] The air supply fan 4 consists of an air supply rotating shaft 41, an air supply motor 42, an air supply impeller 43, and an air supply casing 44. The air supply fan 4 is fixed to the partition plate 9 and supplies air from the outdoors 22 to the indoors 21.

[0034] The partition plate 9 is a plate-shaped component with a flat surface, and is located inside the duct 3. By installing the duct 3 so as to divide its circular cross-section in two, an air intake passage 81 and an exhaust passage 82 are formed inside the duct 3.

[0035] The exhaust fan 5, heat exchange element 6, and filter 7 are installed inside the indoor enclosure 2.

[0036] The airflow in the air supply passage 81 inside the indoor enclosure 2 flows from upstream through the filter 7, through the heat exchange element 6, through the louver-side opening 86, and into the room 21 from the indoor air supply port 31.

[0037] The airflow in the exhaust air passage 82 inside the indoor enclosure 2 flows from upstream, through the indoor exhaust port 32, through the heat exchange element 6, through the exhaust fan 5, and out through the enclosure exhaust opening 85 into the duct 3.

[0038] Filter 7 has the role of removing dust and other particles contained in the air passing through it, and then releasing the air with reduced dust and other particles downstream.

[0039] While filter 7 can have any shape, a rectangular, thick plate shape is used as the basis here. This is to maximize the opening area of ​​filter 7 and ensure dust collection performance.

[0040] It is preferable that the filter 7 be placed inside the indoor enclosure 2, immediately after the enclosure air supply opening 84. This is intended to reduce dust contained in the air supplied to the room, as well as to reduce clogging of components such as the heat exchange element 6 located downstream of the filter 7.

[0041] The heat exchange element 6 is a component with a rectangular, thick plate shape. Its configuration involves stacking numerous heat exchange plates alternately so as to intersect the supply air passage 81 and the exhaust air passage 82. Its role is to reduce energy loss due to ventilation by exchanging heat between the supply airflow and the exhaust airflow.

[0042] The exhaust fan 5 consists of an exhaust rotating shaft 51, an exhaust motor 52, an exhaust impeller 53, and an exhaust casing 54.

[0043] As shown in Figure 3(a), the indoor enclosure 2 has a box-shaped outer shell and includes a rear surface 12, a first side surface 13, a second side surface 14, and an outer louver section 11.

[0044] The first side surface 13 has an indoor exhaust port 32 which is the inlet for the exhaust air passage 82.

[0045] The second side surface 14 is located on the surface opposite to the first side surface 13.

[0046] The rear panel 12 includes an air intake opening 84 and an exhaust opening 85.

[0047] The indoor enclosure 2 is installed by fixing the rear surface 12 to the wall surface 20. The indoor enclosure 2 is connected to the duct 3 in the installed state. The supply air casing 44 and the enclosure's supply air opening 84 are connected to form an air supply passage 81 from the duct 3 to the indoor enclosure 2.

[0048] Here, we will use Figures 3(a) and 3(b) to explain the features of the air intake duct 81.

[0049] The outer louver section 11 has a guide section 63, which has a first guide section 61, a second guide section 62, and a side end section 11a.

[0050] The first guide section 61 has a straight section 61a and a curved section 61b.

[0051] The second guide section 62 has a straight section 62a and an end section 62b.

[0052] The front louver 8 is provided so as to cover a portion of the louver-side opening 86 of the interior housing 2, and has a side portion 8a, a front portion 8b, and a rear portion 8c.

[0053] The rear portion 8c has an insulating material 92, and the inside of the outer louver portion 11 has an insulating material 91.

[0054] The insulation materials 91 and 92 are intended to suppress condensation on the exterior louver section 11 and on the surface of the front louver 8, respectively, when the outside air temperature is low and the indoor temperature is high.

[0055] Between the front louvers 8 and the outer louvers 11, an air supply terminal air passage 18 is formed, which is the end portion of the air supply passage 81. The air supply terminal air passage 18 includes a first air supply terminal air passage 15, a second air supply terminal air passage 16, and a third air supply terminal air passage 17.

[0056] The first air supply terminal air passage 15 is located upstream of the second air supply terminal air passage 16 and is formed between the rear surface portion 8c or the insulation material 92 and the first guide portion 61.

[0057] The second air supply terminal air passage 16 is located upstream of the third air supply terminal air passage 17 and is formed in a different direction from the first air supply terminal air passage 15 between the side portion 8a and the straight portion 62a.

[0058] The third air supply terminal air passage 17 is formed in the same direction as the second air supply terminal air passage 16 between the side portion 8a and the end portion 62b.

[0059] The end portion 62b is provided such that it is inclined in a direction that causes the third air supply terminal air passage 17 to widen as it moves in the direction in which the air supply flow 19 flows through the third air supply terminal air passage 17.

[0060] This makes it possible to suppress the induction of indoor air near the indoor air intake vent 31 when the outside air temperature is low and the supply air temperature is below the dew point temperature of the indoor air. As a result, indoor air is less likely to come into contact with the surface of the indoor housing 2 (near the side end 11a) that has been cooled by the supply air, and condensation near the indoor air intake vent 31 can be suppressed.

[0061] Furthermore, Figure 4 illustrates the characteristics of the airflow 19 generated near the indoor air intake vent 31.

[0062] If the direction of the second air supply terminal air passage 16 is defined as the forward direction, and the direction in which the end portion 62b is inclined is defined as the inclination direction, and the angle between the forward direction and the inclination direction is defined as the inclination angle θ, then it is preferable that 20°≦θ≦70°, and more preferably that 45°≦θ≦60°.

[0063] This effectively suppresses vortices (vortices that entrain indoor air) that occur when the supply airflow 19 discharged from the indoor air inlet 31 into the room 21 rapidly expands. Therefore, when the outside air temperature is low and the supply air temperature is below the dew point temperature of the indoor air, the induction of indoor air near the indoor air inlet 31 can be suppressed, and condensation near the indoor air inlet 31 can be suppressed.

[0064] Furthermore, as shown in Figure 4, regarding the airflow after the supply airflow 19 is discharged from the louver-side opening 86, the first supply air termination airflow passage 15 widens in the creepage direction along the front louver 8, and its direction is bent by the curved portion 61b. The first supply air termination airflow passage 15 is connected to the second supply air termination airflow passage 16, which is oriented in the forward direction of the indoor housing 2.

[0065] Even if the airflow path is bent at a right angle, the main flow of the supply air 19 is tilted towards the second side surface 14. As a result, near the indoor air intake 31, the airflow velocity of the supply air 19 on the outer louver section 11 side (second guide section 62 side) is high, while the airflow velocity of the supply air 19 on the front louver 8 side (side section 8a side) is low.

[0066] Therefore, near the indoor air intake vent 31, vortices (vortices that entrain indoor air) are more likely to occur on the outer louver section 11 side than on the front louver 8 side, due to the rapid expansion of the air intake flow 19.

[0067] Therefore, by providing the end portion 62b, which has the effect of suppressing condensation by suppressing this vortex, on the outer louver portion 11 side (second side surface 14 side) rather than the front louver 8 side, the effect of suppressing condensation can be efficiently obtained.

[0068] Figure 5 shows the airflow discharged from the indoor air intake vent 31.

[0069] As explained above, the inclination of the end portion 62b has the effect of suppressing condensation, but as the outside air temperature decreases, condensation will eventually occur at the end portion 62b.

[0070] Using Figures 6(a) and 6(b), we will explain a configuration that suppresses the dripping of condensation water when condensation occurs.

[0071] In addition to the above, the indoor enclosure 2 includes an air passage bottom 64, a water receiving inclined section 65, a lower surface 66, and a drain pan section 67.

[0072] The bottom of the air duct 64 is located below the outlet of the supply air terminal air duct 18 (third supply air terminal air duct 17).

[0073] The water receiving inclined section 65 is located directly below the end section 62b. The water receiving inclined section 65 is inclined so as to have a downward slope from the second side surface 14 towards the drain pan section 67. In other words, the water receiving inclined section 65 is inclined so as to guide condensed water to the drain pan section 67 (especially the corner section 67a). The water receiving inclined section 65 has a shape that widens as it approaches the drain pan section 67.

[0074] The lower surface 66 is provided as the lowest surface of the indoor enclosure 2.

[0075] The drain pan section 67 has a corner section 67a, a bottom surface 67b, a protrusion 67c, a side surface A, a side surface B, and a side surface C. The drain pan section 67 is located on the interior side of the indoor housing 2, beyond the indoor air intake port 31. The drain pan section 67 forms a box shape with its bottom surface 67b, side surface A, side surface B, side surface C, and side surface D (not shown, the surface opposite side surface A), and has a structure that can collect condensed water.

[0076] A portion of the lower end of the water-receiving inclined section 65 is connected to the protrusion 67c, and another portion of the lower end of the water-receiving inclined section 65 is connected to the corner 67a.

[0077] As a result, the condensation generated at the end portion 62b moves toward the bottom surface 66 due to gravity and reaches the water receiving inclined portion 65. Then, the condensation moves along the inclination of the water receiving inclined portion 65 and moves toward the drain pan portion 67. The condensation then comes into contact with the bottom end portion 66a, the protrusion 67c, and the corner portion 67a. In this case, the corner portion 67a has the greatest surface tension because it is composed of two surfaces, side A and side B, so the condensation is drawn through the corner portion 67a to the bottom surface 67b inside the drain pan portion 67. Therefore, the condensation is drawn toward the indoor housing 2. This prevents dripping into the room 21.

[0078] In this way, an indoor housing 2 can be obtained that can draw condensation water generated at the end portion 62b to the drain pan portion 67 located inside the indoor air intake port 31, thereby suppressing the dripping of condensation water.

[0079] The condensation generated at the end portion 62b gradually grows into a large droplet. Due to gravity, it moves downward from the point of origin, but due to surface tension, it does not leave the end portion 62b but travels along the surface. The downward movement speed of the condensation water accelerates over time according to the acceleration of gravity, but by coming into contact with the water receiving inclined portion 65 located directly below the end portion 62b, the movement speed can be drastically reduced, and the condensation water can be drawn into the drain pan portion 67.

[0080] Next, I will provide some supplementary information about this embodiment.

[0081] By integrating the drain pan section 67 with the indoor housing 2, it is possible to obtain an indoor housing 2 with a drain pan function without increasing the size of the indoor housing 2. In other words, it becomes possible to miniaturize the indoor housing 2 with a drain pan function.

[0082] Furthermore, in this embodiment, the end portion 62b was described as having a structure in which the third air supply terminal air passage 17 widens as it moves in the direction in which the air supply flow 19 flows through the third air supply terminal air passage 17, Even if the end portion 62b is not inclined, the same function and effect as described above can be obtained by providing a water-receiving inclined portion 65 directly below the end portion 62b. For example, even if the end portion 62b is not inclined and θ in Figure 4 is 0°, it is still possible to form a water-receiving inclined portion 65. In this case, the area of ​​the water-receiving inclined portion 65 will be smaller, but by providing a slope in the water-receiving inclined portion 65 so that condensed water is guided to the drain pan portion 67 (especially the corner portion 67a), the same function and effect as described above can be obtained.

[0083] If the end portion 62b is not inclined, more condensation will occur at the end portion 62b compared to when it is inclined.

[0084] The curved portion 61b and the side end portion 11a are not essential. It is possible to obtain the effects and advantages of this embodiment even without the curved portion 61b and the side end portion 11a.

[0085] Furthermore, the partition plate 9, exhaust fan 5, exhaust air passage 82, and heat exchange element 6 do not necessarily have to be provided, and the effects and advantages of this embodiment can be obtained even with an air supply system that omits these components.

[0086] Although the air supply device or heat exchange ventilation device according to the present invention has been described above based on embodiments, the present invention is not limited to these embodiments. Within the scope of the present invention, various modifications that a person skilled in the art can conceive of may be applied to these embodiments, as well as configurations constructed by combining components from different embodiments, are also included without departing from the spirit of the present invention. [Industrial applicability]

[0087] The air supply device or heat exchange ventilation device according to the present invention has a configuration that can suppress the dripping of condensation water when condensation occurs on the surface of the box near the air supply port when the outside air temperature is low and the supply air temperature is below the dew point temperature of the indoor air. It can be applied to devices that supply air, as well as devices that simultaneously supply and exhaust air and are connected to a double-layer pipe, and is useful when applied to ventilation devices that constitute ventilation systems and air conditioning systems. [Explanation of Symbols]

[0088] 1. Heat exchange ventilation system 2 Indoor enclosure 3 ducts 4. Air supply fan 5. Exhaust fan 6 Heat exchange element 7 filters 8 Front Louvers 8a Side part 8b Front part 8c Rear part 9 partition plates 10 Outdoor Hoods 11. Exterior louver section 11a Side edge 12 Back 13 First aspect 14 Second aspect 15. First supply air terminal air duct 16. Second air supply terminal air duct 17. Third air supply terminal air duct 18 Air intake terminal air passage 19. Airflow 20 Wall surfaces 21 Indoor 22 Outdoor 25 Through holes 31 Indoor air intake vent 32 Indoor exhaust vent 33 Outdoor side air supply vent 34 Outdoor exhaust vent 41 Air intake rotating shaft 42 Air intake motor 43. Air intake impeller 44. Air intake casing 51 Exhaust Rotating Shaft 52 Exhaust motor 53 Exhaust Impeller 54 Exhaust casing 61. Section 1 Guide 61a Straight section 61b Curved section 62. Section 2 of the Guide Department 62a Straight section 62b End part 63 Guide Section 64 Bottom of air passage 65 Water receiving slope 66 Bottom surface 66a Bottom side edge 67 Drain pan section 67a Corner 67b Bottom 67c protrusion A side B side C side 81 Air intake duct 82 Exhaust airflow duct 84 Enclosure air intake opening 85 Exhaust opening for the enclosure 86 Louver side opening 91 Insulation 92 Insulation 101 Box body 102 Exhaust Impeller 103 Air intake impeller 104 Electric motor 105 Heat exchanger 106 Double layer pipe 107 Air supply port 110 Intake and Exhaust Fan 120 Building interior wall 121 Exhaust passage 122 Air supply passage

Claims

1. An air supply device comprising a front louver, an indoor housing, and an air supply fan, The aforementioned indoor enclosure includes an external louver section, a water receiving inclined section, and a drain pan section. The aforementioned air supply fan forms an air supply air passage through which air is supplied from outdoors to indoors. The aforementioned outer louver portion includes a guide portion, The guide portion includes the terminal portion, The drain pan portion includes a corner and a bottom surface. Between the front louver and the outer louver portion, an air supply termination passage, which is the end portion of the air supply passage, is formed. The aforementioned end portion is provided at the downstream end of the air supply terminal air passage, The water receiving inclined portion is located directly below the end portion and is inclined so that condensation water generated at the end portion is guided through the corner portion to the bottom surface, characterized in that of an air supply device.

2. A heat exchange ventilation system comprising the air supply device described in claim 1, It comprises an exhaust fan and a heat exchange element, The exhaust fan is provided in the indoor enclosure downstream of the heat exchange element and forms an exhaust air passage through which air is blown from the indoor to the outdoors. The aforementioned indoor enclosure includes a rear surface, a first side surface, and a second side surface. The aforementioned rear surface is installed against the wall of the room. The first side surface has an indoor exhaust port which is the inlet for the exhaust air passage, The second side surface is located on the surface opposite to the first side surface. The heat exchange element is provided at a position adjacent to the indoor exhaust port, where the supply air passage and the exhaust air passage intersect. The heat exchange ventilation device is characterized in that the water receiving inclined portion is provided on the second side surface.

3. The heat exchange ventilation device according to claim 2, characterized in that the water receiving inclined portion is not provided on the first side surface.

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