Air supply device and heat exchange ventilation system equipped therewith

Abstract

To suppress dew formation 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 front louver 8 includes a front surface part 8b, a rear surface part 8c, and a side surface part 8a. The indoor casing 2 includes an outer louver part 11. The outer louver part 11 includes a first guide part 61 and a second guide part 62. The second guide part 62 includes a rectilinear part 62a and an inclined part 62b. A first air supply terminal air course 15 is formed between the rear surface part 8c and the first guide part 61. A second air supply terminal air course 16 is formed between the side surface part 8a and the rectilinear part 62a. A third air supply terminal air course 17 is formed between the side surface part 8a and the inclined part 62b. The inclined part 62b is inclined in a direction in which the third air supply terminal air course 17 expands toward a direction in which a supply air current 19 flowing in the third air supply terminal air course 17 progresses.SELECTED DRAWING: Figure 3

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 that communicates the outdoors and the indoor.

Background Art

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

[0003] Hereinafter, the heat exchange type ventilator will be described with reference to FIG. 6.

[0004] This heat exchange type ventilator includes a box body, a supply and exhaust air blower, a double-layer pipe, and a heat exchanger.

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

[0006] The supply and exhaust air blower includes an exhaust impeller and a supply air impeller that are respectively fixed to ends of coaxial rotating shafts protruding toward both ends from a single electric motor.

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

[0008] Supply air passes through the air supply passage, exchanges heat with exhaust air in the heat exchanger, and is then supplied into the room from an air supply port.

Prior Art Literature

Patent Literature

[0009] [Patent Document 1] Japanese Utility Model Publication No. 57-46732 [Overview of the project] [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 type ventilation device that can suppress condensation near the indoor air supply opening 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 fan, wherein the front louver includes a front portion, a rear portion, and a side portion, the indoor housing includes an outer louver portion, the outer louver portion includes a first guide portion and a second guide portion, and the second guide portion includes a straight portion and an inclined portion The air supply fan includes the following features: it forms an air supply air passage through which air is supplied from outdoors to indoors; a first air supply termination passage, a second air supply termination passage, and a third air supply termination passage are formed between the front louver and the outer louver section, which are the end parts of the air supply air passage; the first air supply termination passage is located upstream of the second air supply termination passage and is formed between the rear section and the first guide section; the second air supply termination passage is located upstream of the third air supply termination passage and is formed between the side section and the straight section in a different direction from the first air supply termination passage; the third air supply termination passage is formed between the side section and the inclined section in the same direction as the second air supply termination passage; and the inclined section is inclined in a direction that causes the third air supply termination passage to widen as it moves in the direction of the air supply flow through the third air supply termination passage, thereby achieving the intended purpose. [Effects of the Invention]

[0013] According to the present invention, condensation near the indoor air inlet, which is the outlet of the air supply passage, can be suppressed. [Brief explanation of the drawing]

[0014] [Figure 1] Overall perspective view of the heat exchange ventilation system according to 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] 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 front louver includes a front portion, a rear portion, and a side portion, the indoor housing includes an outer louver portion, the outer louver portion includes a first guide portion and a second guide portion, the second guide portion includes a straight portion and an inclined portion, and the air supply blower forms an air supply air passage through which air is supplied from the outside to the inside, and between the front louver and the outer louver portion, there is a first air supply end air passage, a second air supply end air passage, and A third air supply terminal duct is formed, and the first air supply terminal duct is located upstream of the second air supply terminal duct and is formed between the rear section and the first guide section, the second air supply terminal duct is located upstream of the third air supply terminal duct and is formed between the side section and the straight section in a different direction from the first air supply terminal duct, the third air supply terminal duct is formed between the side section and the inclined section in the same direction as the second air supply terminal duct, and the inclined section is inclined in a direction that causes the third air supply terminal duct to widen as it moves in the direction in which the air supply flow through the third air supply terminal duct travels.

[0016] This makes it possible to suppress the induction of indoor air near the air intake 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 indoor enclosure wall surface cooled by the supply air, and condensation near the indoor air intake, which is the outlet of the supply air passage, can be suppressed.

[0017] Alternatively, the configuration may be such that the direction of the second air supply terminal duct is forward, the direction in which the inclined section inclins is defined as the inclination direction, and the angle between the forward direction and the inclination direction is defined as the inclination angle θ, where 20° ≤ θ ≤ 70°.

[0018] This makes it possible to suppress vortices (vortices that entrain indoor air) that occur when the outside air temperature is low and the supply air temperature falls below the dew point temperature of the indoor air, as the supply air is rapidly expanded as it is discharged into the room from the air intake. As a result, the induction of indoor air near the air intake can be suppressed, making it less likely for indoor air to come into contact with the indoor enclosure wall surface cooled by the supply air, and thus suppressing condensation near the air intake.

[0019] Further, a heat exchange type ventilator according to one aspect of the present invention is a heat exchange type ventilator provided with an air supply device, comprising an exhaust blower and a heat exchange element, wherein the exhaust blower is provided on a downstream side of the heat exchange element in an indoor housing, 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, and the inclined portion may be provided on the second side surface side.

[0020] 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 with the exhaust-side downstream of the heat exchange element discharged from the second side surface side is lower than the temperature of supply air that has exchanged heat with the exhaust-side upstream of the heat exchange element discharged from the first side surface side. By providing the inclined portion on the second side surface side where the supply air temperature is lower, dew condensation near the air supply port can be effectively suppressed.

[0021] Further, the inclined portion may be configured not to be provided on the first side surface side.

[0022] When the outside air temperature is low, the temperature of supply air that has exchanged heat with the exhaust-side upstream of the heat exchange element discharged from the first side surface side is higher than the temperature of supply air that has exchanged heat with the exhaust-side downstream of the heat exchange element discharged from the second side surface side. Even if the inclined portion is not provided on the first side surface side, by providing the inclined portion on the second side surface side, dew condensation near the air supply port can be suppressed in the entire device.

[0023] Further, the inclined portions are provided on the first side surface side and the second side surface side, wherein the direction of the second supply air end air passage is defined as a forward direction, the direction in which the inclined portion inclines is defined as an inclined direction, and an angle formed by the forward direction and the inclined direction is defined as an inclination angle, the inclination angle on the second side surface side may be configured to be smaller than the inclination angle on the first side surface side.

[0024] This allows the entire device to suppress condensation near the air intake.

[0025] Embodiments of the present invention will be described below with reference to the drawings.

[0026] (Embodiment 1) As shown in Figures 1 and 2, the heat exchange ventilation system 1 comprises an indoor housing 2, a duct 3, an outdoor hood 10, and a front louver 8.

[0027] The indoor enclosure 2 is installed on the side of the indoor unit 21 and is responsible for supplying air to the indoor unit 21 and exhausting indoor air.

[0028] The outdoor hood 10 is installed on the outdoor side 22 and is used for exhausting air to the outdoor side 22 and supplying indoor air.

[0029] The duct 3 has, for example, a hollow cylindrical outer shell and is installed inside a through-hole 25 provided in the wall surface 20. The indoor end of the duct 3, which has a circular cross-section, is connected to the indoor housing 2, and the outdoor end of the circular cross-section is connected to the outdoor hood 10.

[0030] As a result, the duct 3 is sandwiched and connected between the indoor enclosure 2 and the outdoor hood 10, connecting the supply and exhaust air passages to each.

[0031] In this way, the heat exchange ventilation system 1 is installed against the wall surface 20, and has an air supply passage 81 and an exhaust passage. An air passage 82 is formed to supply and exhaust air between the indoor 21 and the outdoor 22.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] The duct 3 has a partition plate 9 and an air supply fan 4 inside a hollow cylindrical structure.

[0037] 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.

[0038] The partition plate 9 is a plate-shaped component with a flat surface, and is installed inside the duct 3 to divide the circular cross-section of the duct 3 in two, thereby forming an air intake passage 81 and an exhaust passage 82 inside the duct 3.

[0039] The exhaust fan 5, heat exchange element 6, and filter 7 are installed inside the indoor enclosure 2.

[0040] 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.

[0041] 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.

[0042] The filter 7 removes dust and other particles from the air passing through it, and then flows the air with reduced dust and other particles downstream.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] The exhaust blower 5 includes an exhaust rotating shaft 51, an exhaust motor 52, an exhaust impeller 53, and an exhaust valve. It consists of -ing 54 and

[0047] 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.

[0048] The first side surface 13 has an indoor exhaust port 32 which is the inlet for the exhaust air passage 82.

[0049] The second side surface 14 is located on the side opposite to the first side surface 13.

[0050] The rear panel 12 includes an air intake opening 84 and an exhaust opening 85.

[0051] 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.

[0052] Here, we will use Figures 3(a) and 3(b) to explain the features of the air intake duct 81.

[0053] The outer louver portion 11 has a guide portion 63 and a side end portion 11a.

[0054] The guide section 63 has a first guide section 61 and a second guide section 62.

[0055] The first guide section 61 has a straight section 61a and a curved section 61b.

[0056] The second guide section 62 has a straight section 62a and an inclined section 62b.

[0057] 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.

[0058] The rear portion 8c has an insulating material 92. The inside of the outer louver portion 11 has an insulating material 91.

[0059] 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.

[0060] 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.

[0061] The first air supply terminal duct 15 is located upstream of the second air supply terminal duct 16 and is formed between the rear surface portion 8c or the insulation material 92 and the first guide portion 61.

[0062] 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.

[0063] The third air supply terminal air passage 17 is formed between the side portion 8a and the inclined portion 62b in the same direction as the second air supply terminal air passage 16.

[0064] The inclined section 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.

[0065] 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.

[0066] Furthermore, Figure 4 illustrates the characteristics of the airflow 19 generated near the indoor air intake vent 31.

[0067] If the direction of the second air supply terminal air passage 16 is defined as the forward direction, the direction in which the inclined 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°.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] Therefore, by providing the inclined section 62b, which has the effect of suppressing condensation by suppressing this vortex, on the outer louver section 11 side (second side surface 14 side) rather than the front louver 8 side, the effect of suppressing condensation can be efficiently obtained.

[0073] Figure 5 shows the airflow discharged from the indoor air intake vent 31.

[0074] In this configuration, when the outside air temperature is low and the supply air temperature is below the dew point temperature of the indoor air, the air discharged from the indoor air inlet 31 located on the second side surface 14 side contains a large amount of air that has passed through the second side surface 14 side of the heat exchange element 6, and has exchanged heat with exhaust air that has already been cooled by heat exchange upstream of the heat exchange element 6. Therefore, when the outside air temperature is low, the temperature of the air discharged from the indoor air inlet 31 located on the second side surface 14 side will be lower than the temperature of the air discharged from the indoor air inlet 31 located on the first side surface 13 side.

[0075] Therefore, by not providing the inclined portion 62b on the first side surface 13 side and only on the second side surface 14 side near the indoor air intake 31, it is possible to obtain the effect of suppressing condensation.

[0076] Furthermore, as mentioned above, when the outside air temperature is low, the temperature of the supply air discharged from the indoor air supply port 31 on the first side surface 13 is higher than the temperature of the supply air discharged from the indoor air supply port 31 on the second side surface 14. At this time, near the indoor air supply port 31, a symmetrical shape is formed. In this configuration, an inclined portion such as the inclined portion 62b may be provided on the first side surface 13 side. Furthermore, by making the inclination angle θ of the inclined portion on the second side surface 14 side smaller than the inclination angle of the inclined portion on the first side surface 13 side, the entire device can effectively suppress condensation near the indoor air intake 31. This is because, near the indoor air intake 31, a smaller inclination angle θ can suppress the rapid expansion of the airflow path of the air supply 19 directed towards the room 21.

[0077] Next, I will provide some supplementary information about this embodiment.

[0078] 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.

[0079] 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.

[0080] 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]

[0081] The air supply device or heat exchange ventilation device according to the present invention has a configuration that can suppress condensation 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]

[0082] 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 Slope 63 Guide Section 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 front louver includes a front section, a rear section, and side sections. The aforementioned indoor enclosure includes an external louver section, The aforementioned outer louver portion includes a first guide portion and a second guide portion. The second guide section includes a straight section and an inclined section. The aforementioned air supply fan forms an air supply air passage through which air is supplied from outdoors to indoors. Between the front louver and the outer louver portion, a first air supply termination passage, a second air supply termination passage, and a third air supply termination passage are formed, which are the end portions of the air supply passage. The first air supply terminal air passage is located upstream of the second air supply terminal air passage and is formed between the rear surface portion and the first guide portion. The second air supply terminal air passage is located upstream of the third air supply terminal air passage and is formed in a different direction from the first air supply terminal air passage between the side portion and the straight portion. The third air supply terminal air passage is formed between the side portion and the inclined portion in the same direction as the second air supply terminal air passage. The inclined portion is characterized in that it is inclined in a direction that widens the third supply terminal air passage as it moves in the direction in which the supply air flow through the third supply terminal air passage advances.

2. The direction of the second air supply terminal duct is set to the forward direction. The direction in which the inclined portion is inclined is defined as the inclination direction. If the angle between the forward direction and the inclination direction is denoted as the inclination angle θ, The air supply device according to claim 1, characterized in that 20° ≤ θ ≤ 70°.

3. A heat exchange ventilation system comprising the air supply device described in claim 1 or 2, 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 inclined portion is provided on the second side surface.

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

5. The inclined portion is provided on the first side and the second side, The direction of the second air supply terminal duct is set to the forward direction. The direction in which the inclined portion is inclined is defined as the inclination direction. If the angle between the forward direction and the inclination direction is defined as the inclination angle, The heat exchange ventilation device according to claim 3, characterized in that the inclination angle of the second side is smaller than the inclination angle of the first side.

Images