Ventilating device

Abstract

Provided is a heat recovery ventilator (HRV) capable of suppressing cost increase. The HRV includes a main body case (1), an exhaust fan (2), a supply fan (3), a total heat exchanger (4), and an electrical component box (5). The exhaust fan (2) is provided in an exhaust passage (15) inside the main body case (1). The supply fan (3) is provided in a supply passage (16) inside the main body case (1). The total heat exchanger (4) is provided midway between the exhaust passage (15) and the supply passage (16). The electrical component box (5) is connected to the main body case (1) to house a heat generating component (HPC). The electrical component box (5) has an air introduction port (51) through which air outside the main body case (1) is introduced, and an air discharge port (52) that communicates with the exhaust passage (15) on an upstream side compared to the exhaust fan (2).

Description

Technical Field

[0001] This disclosure relates to ventilation devices. Background Technology

[0002] Conventional ventilation devices that allow for total heat exchange between exhaust air and supply air from the outside (see, for example, Patent Document 1) are known. Such ventilation devices are equipped with an electrical installation box. The drive circuitry for the supply and exhaust fans is housed within the electrical installation box.

[0003] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2014-178083 Summary of the Invention The problem that the invention aims to solve In the ventilation device described in Patent Document 1 above, if an additional fan is installed inside the electrical mounting box in order to cool the heat-generating components of the drive circuit section that constitutes the electrical mounting box, there is a concern that the cost of the ventilation device will increase.

[0004] This disclosure provides a ventilation device capable of suppressing cost increases.

[0005] Methods for solving problems One aspect of this disclosure provides a ventilation device (HRV) comprising: a main housing (1), an exhaust fan (2) disposed in an exhaust passage (15) inside the main housing (1), an air supply fan (3) disposed in an air supply passage (16) inside the main housing (1), a total heat exchanger (4) disposed between the exhaust passage (15) and the air supply passage (16), and an electrical installation box (5) connected to the main housing (1) to house a heating element (HPC), the electrical installation box (5) having: an air inlet (51) for introducing air (A) from outside the main housing (1), and an air outlet (52) connected to the exhaust passage (15) upstream of the exhaust fan (2).

[0006] According to the ventilation device (HRV) described above, no additional fan is required inside the electrical installation box (5) to cool the heat-generating components (HPC), thus providing a ventilation device that can suppress cost increases.

[0007] In the ventilation device (HRV) described above, the main housing (1) may have a first sidewall (1c) on which the outlet (17) of the total heat exchanger (4) is provided, and the electrical installation box (5) may be connected to the first sidewall (1c). With this configuration, access to the electrical installation box (5) becomes easier, and the maintainability of the ventilation device (HRV) is improved.

[0008] In the above-described ventilation device (HRV), the exhaust passage (15) has an exhaust inlet (11) opening to the upstream end and an exhaust outlet (12) opening to the downstream end. The electrical installation box (5) can be disposed inside the exhaust passage (15) between the total heat exchanger (4) and the exhaust inlet (11). With this configuration, the ventilation device (HRV) can be miniaturized compared to the case where the electrical installation box (5) is located outside the main housing (1).

[0009] The ventilation device (HRV) described above can have a connection passage (6) that connects the air outlet (52) of the electrical installation box (5) to the exhaust passage (15). With this configuration, the freedom of position for forming the air outlet (52) within the electrical installation box (5) can be increased, and the heat-generating components (HPC) can be cooled more effectively.

[0010] In the above-described ventilation system (HRV), the electrical mounting box (5) can be disposed on the outside of the main housing (1). This configuration ensures the cross-sectional area of ​​the exhaust passage (15) and the air supply passage (16), facilitating smooth ventilation using the HRV. Furthermore, it increases the freedom of positioning the air inlet (51) that forms the air (A) leading to the electrical mounting box (5) from the outside of the main housing (1). Moreover, compared to the case where the electrical mounting box (5) is disposed inside the main housing (1), operation of the electrical mounting box (5) becomes easier, and maintainability of the electrical mounting box (5) is improved.

[0011] The ventilation device (HRV) described above can have a connection passage (6) that connects the air outlet (52) of the electrical installation box (5) to an air inlet (19a) that opens into the partition wall (15c) of the exhaust passage (15). With this configuration, the freedom of position for forming the air outlet (52) within the electrical installation box (5) can be increased, and the heat-generating components (HPC) can be cooled more effectively.

[0012] In the ventilation device (HRV) described above, the air inlet (51) of the electrical installation box (5) may include a plurality of slits (51a) formed in the electrical installation box (5). With this configuration, the intrusion of foreign objects into the air inlet (51) of the electrical installation box (5) can be suppressed.

[0013] In the ventilation device (HRV) described above, the air inlet (51) of the electrical installation box (5) can be provided on the side wall (5a, 5b, 5c, 5d) of the electrical installation box (5). With this configuration, it is possible to prevent water falling from above the ventilation device (HRV) from entering the air inlet (51). Attached Figure Description

[0014] Figure 1 A longitudinal cross-sectional view is shown for the purpose of schematically illustrating Embodiment 1 of the ventilation device involved in this disclosure.

[0015] Figure 2 for Figure 1 A schematic plan view of the ventilation system (HRV).

[0016] Figure 3 To indicate Figure 1 A block diagram of the structure of the ventilation system (HRV).

[0017] Figure 4 For along Figure 2 A schematic enlarged cross-sectional view of the IV-IV ventilation system (HRV).

[0018] Figure 5 This is Embodiment 2 of the ventilation device involved in this disclosure. Figure 4 The corresponding enlarged cross-sectional view. Detailed Implementation

[0019] Hereinafter, with reference to the accompanying drawings, embodiments of the ventilation device involved in this disclosure will be described.

[0020] [Implementation Method 1] Figure 1 A longitudinal cross-sectional view is shown for the purpose of schematically illustrating Embodiment 1 of the ventilation device involved in this disclosure. Figure 2 for Figure 1 A schematic plan view of the ventilation system (HRV). Additionally, Figure 2 for Figure 1 The diagram shows a plan view of the main housing (1) of the ventilation system (HRV) with its upper end open. Furthermore, Figure 1 and Figure 2 The display shows a three-dimensional orthogonal coordinate system with an X-axis parallel to the length direction of the ventilation device (HRV), a Y-axis parallel to the width direction of the ventilation device (HRV), and a Z-axis parallel to the vertical direction of the ventilation device (HRV).

[0021] The ventilation system (HRV) in this embodiment is, for example, installed in the space above the ceiling (C) above the partitioned indoor space (IDS), i.e., the space inside the ceiling (OCS). Alternatively, the ventilation system (HRV) can be installed in an indoor space (IDS) without a ceiling space (OCS), for example, like a framed ceiling. The ventilation system (HRV) draws in indoor air (RA) from the indoor space (IDS) through a ventilation port (VD) installed in the ceiling (C), and blows exhaust air (EA) out to the space outside the building through an exhaust duct (EAD) and an exhaust port installed on the exterior wall of the building.

[0022] Furthermore, the human ventilation system (HRV) draws in outside air (OA) from the exterior of the building via external air vents and external air ducts (OAD), and delivers fresh air (SA) to the indoor space (IDS) via air supply ducts (SAD) and air supply vents (C). In addition, the HRV facilitates heat exchange between indoor air (RA) and outside air (OA), reducing the temperature difference between the supply air (SA) and indoor air (RA) supplied to the indoor space (IDS).

[0023] The ventilation system (HRV) includes, for example, a main housing (1), an exhaust fan (2), an air supply fan (3), a total heat exchanger (4), and an electrical installation box (5).

[0024] The main shell (1) is, for example, a shell having a generally rectangular parallelepiped shape. The main shell (1) has, for example, an exhaust inlet (11) on the interior side wall (1a) and an exhaust outlet (12) on the exterior side wall (1b). The exhaust inlet (11) is, for example, connected to the downstream end of a ventilation duct (VD). The upstream end of the ventilation duct (VD) is, for example, connected to a ventilation opening provided on the roof (C). The exhaust outlet (12) is, for example, connected to the upstream end of an exhaust duct (EAD). The downstream end of the exhaust duct (EAD) is, for example, connected to an exhaust outlet provided on the exterior wall of the building.

[0025] Furthermore, the main body shell (1) has an air inlet (13) on the exterior side wall (1b) and an air outlet (14) on the interior side side wall (1a). The air inlet (13) is, for example, connected to the downstream end of an external air duct (OAD). The upstream end of the external air duct (OAD) is, for example, connected to an external air vent located on the exterior wall of the building. The air outlet (14) is, for example, connected to the upstream end of an air supply duct (SAD). The downstream end of the air supply duct (SAD) is, for example, connected to an air vent located on the roof (C).

[0026] Furthermore, inside the main housing (1), for example, an exhaust passage (15) and an air supply passage (16) are defined by a partition wall. The exhaust passage (15) connects, for example, an exhaust inlet (11) to an exhaust outlet (12). The air supply passage (16) connects, for example, an air supply inlet (13) to an air supply outlet (14). A total heat exchanger (4) is disposed midway between the exhaust passage (15) and the air supply passage (16). The exhaust passage (15) and the air supply passage (16), for example, Figure 1 As shown, it is arranged in a cross configuration via a total heat exchanger (4).

[0027] For example, in the exhaust upstream section (15a), which is located upstream of the air flow path compared to the total heat exchanger (4), the exhaust passage (15) is located below the air supply passage (16). Furthermore, in the exhaust downstream section (15b), which is located downstream of the air flow path compared to the total heat exchanger (4), the exhaust passage (15) is located above the air supply passage (16).

[0028] In other words, the air supply passage (16), for example, in the upstream section (16a) of the air supply passage located upstream of the air flow path compared to the total heat exchanger (4), is located below the exhaust passage (15). Furthermore, in the downstream section (16b) of the air supply passage located downstream of the air flow path compared to the total heat exchanger (4), the air supply passage (16) is located above the exhaust passage (15).

[0029] An exhaust fan (2) is provided in an exhaust passage (15) inside the main housing (1). Specifically, the exhaust fan (2) is provided, for example, in the exhaust passage (15) in a downstream exhaust portion (15b) located downstream of the airflow path compared to the total heat exchanger (4). The exhaust fan (2) is, for example, a Sirocco fan, having a housing (21), a cylindrical multi-blade fan (22) housed in the housing (21), and an electric motor (23) that rotates the multi-blade fan (22).

[0030] An air supply fan (3) is provided in the air supply passage (16) inside the main housing (1). Specifically, the air supply fan (3) is provided, for example, in the air supply passage (16), in the downstream part (16b) of the air supply, which is located downstream of the air flow path compared to the total heat exchanger (4). The air supply fan (3) is, for example, a Sirocco fan, which has a housing (31), a cylindrical multi-blade fan (32) housed in the housing (31), and an electric motor (33) that rotates the multi-blade fan (32).

[0031] The total heat exchanger (4) is located midway between the exhaust passage (15) and the supply passage (16). The total heat exchanger (4), for example, includes heat exchange elements that allow water molecules to pass through, and which alternately stack first and second flow path forming materials made of a thin, dense material that shields against impurities such as carbon dioxide, via a spacer plate made of the same material. The total heat exchanger (4), for example, is as follows: Figure 1 and Figure 2 As shown, it has a slender rectangular shape. For example, in the case of a total heat exchanger (4), Figure 1 The side view shown has a rhomboid shape when viewed orthogonally along the length direction, and has a first surface (41), a second surface (42), a third surface (43), and a fourth surface (44) along the length direction of the total heat exchanger (4).

[0032] The first flow path forming material and the partition plate constituting the heat exchange element of the total heat exchanger (4) form, for example, a flow path that connects the first surface (41) and the second surface (42) of the total heat exchanger (4). The first surface (41) of the total heat exchanger (4) is a surface that faces downward at an angle opposite to the side wall (1a) on the indoor side of the main body shell (1), and is connected to the downstream end of the exhaust upstream portion (15a) of the exhaust passage (15). The second surface (42) of the total heat exchanger (4) is a surface that faces upward at an angle opposite to the side wall (1b) on the outdoor side of the main body shell (1), and is connected to the upstream end of the exhaust downstream portion (15b) of the exhaust passage (15).

[0033] The second flow path forming material of the heat exchange element constituting the total heat exchanger (4) and the partition plate, for example, form a flow path that connects the third surface (43) and the fourth surface (44) of the total heat exchanger (4). The third surface (43) of the total heat exchanger (4) is a surface that faces downward at an angle opposite to the side wall (1b) on the outdoor side of the main body shell (1), and is connected to the downstream end of the upstream air supply section (16a) of the air supply passage (16). The fourth surface (44) of the total heat exchanger (4) is a surface that faces upward at an angle opposite to the side wall (1a) on the indoor side of the main body shell (1), and is connected to the upstream end of the downstream air supply section (16b) of the air supply passage (16).

[0034] Figure 3 To display Figure 1 A block diagram of the structure of the ventilation system (HRV). Figure 4 For along Figure 2 A schematic enlarged cross-sectional view of the IV-IV ventilation system (HRV). Figure 4 As shown, the electrical mounting box (5), for example, is connected to the main housing (1) and houses the heating element (HPC). Specifically, the main housing (1), for example, Figure 2As shown, a first sidewall (1c) has an outlet (17) where a total heat exchanger (4) is provided. An electrical mounting box (5) is connected, for example, to the first sidewall (1c) of the main housing (1).

[0035] For example, the first sidewall (1c) of the main shell (1), Figure 2 As shown, this is the side wall adjacent to the inspection port (C1) provided on the roof (C). For example, an operator performing inspections or maintenance of the ventilation system (HRV) can open the inspection port (C1) provided on the roof (C) to access the ventilation system (HRV). The outlet (17) of the total heat exchanger (4) provided on the first side wall (1c) of the main housing (1) is closed, for example, by a cover (18) that can be opened and closed.

[0036] For example, when maintaining or replacing the total heat exchanger (4), the operator opens the cover (18) through the inspection port (C1) to open the outlet (17) of the total heat exchanger (4) located on the first side wall (1c) of the main body housing (1). Thus, the operator can pull the total heat exchanger (4) out along its length from the outlet (17) and remove the total heat exchanger (4) from inside the main body housing (1).

[0037] Furthermore, the second sidewall (1d) of the main body housing (1), which is opposite to the first sidewall (1c), does not have an outlet (17) for removing the total heat exchanger (4). For example, a bypass flow path is provided between the second sidewall (1d) of the main body housing (1) and the total heat exchanger (4), allowing indoor air (RA) to bypass the total heat exchanger (4) and flow from the upstream exhaust portion (15a) to the downstream exhaust portion (15b) of the exhaust passage (15). Therefore, it is difficult to remove the total heat exchanger (4) from the second sidewall (1d) side.

[0038] Figure 4 As shown, the electrical installation box (5) has, for example, an air inlet (51) for introducing external air (A) into the main housing (1), and an air outlet (52) in the exhaust upstream section (15a) upstream of the exhaust fan (2) that communicates with the exhaust passage (15). The electrical installation box (5) has, for example, Figure 3 As shown, the drive circuit (53) of the exhaust fan (2), the drive circuit (54) of the air supply fan (3), and the control circuit (55) that controls these drive circuits (53) and drive circuits (54) are housed.

[0039] The drive circuit (53) of the exhaust fan (2) includes, for example, an inverter circuit that rotates the motor (23) of the exhaust fan (2) at a predetermined speed based on control commands input from the control circuit (55). The drive circuit (54) of the supply fan (3) includes, for example, an inverter circuit that rotates the motor (33) of the supply fan (3) at a predetermined speed based on control commands input from the control circuit (55). These drive circuits (53) and (54) are, for example, Figure 4 As shown, it includes heat-generating components (HPCs) such as power transistors and diodes that make up the inverter circuit.

[0040] The control circuit (55) may, for example, be composed of one or more microcontrollers including a central processing unit (CPU) and memory. The control circuit (55) may, for example, cause the exhaust fan (2) and the intake fan (3) to rotate at a predetermined speed via drive circuits (53) and drive circuits (54) by executing a program stored in memory using the CPU. Figure 3 As shown, it connects to the carbon dioxide sensor (CDS), room temperature sensor (RTS), outside air temperature sensor (OTS), and remote control (RC).

[0041] A carbon dioxide sensor (CDS), for example, detects the carbon dioxide concentration in indoor air (RA) and outputs the detection result to the control circuit (55). A room temperature sensor (RTS), for example, detects the temperature of indoor air (RA) and outputs the detection result to the control circuit (55). An outdoor air temperature sensor (OTS), for example, detects the temperature of outdoor air (OA) and outputs the detection result to the control circuit (55). A remote control (RC), for example, accepts operations such as starting and stopping the ventilation system (HRV) performed by the user of the ventilation system (HRV) and outputs the signal corresponding to the operation to the control circuit (55).

[0042] For example, if a signal corresponding to the start-up operation of the ventilation system (HRV) is input from a remote control (RC), the control circuit (55) outputs control signals to the drive circuit (53) and drive circuit (54) based on the detection results of the carbon dioxide sensor (CDS), the room temperature sensor (RTS), and the outside air temperature sensor (OTS). Thus, the drive circuit (53) and drive circuit (54) rotate the motor (23) of the exhaust fan (2) and the motor (33) of the air supply fan (3) at predetermined speeds based on the carbon dioxide concentration and temperature of the indoor air (RA) and the temperature of the outside air (OA), respectively.

[0043] The heat-generating components (HPCs) that constitute the drive circuit (53) and the drive circuit (54) are, for example, Figure 4As shown, the inner wall surface between the air inlet (51) and air outlet (52) of the electrical mounting housing (5) is fixed. For example, a heat sink (RF) is installed in the heat-generating component (HPC). Air (A) drawn in from the air inlet (51) of the electrical mounting housing (5) flows from the air inlet (51) to the air outlet (52) inside the electrical mounting housing (5), cooling the heat-generating component (HPC) via the heat sink (RF).

[0044] Specifically, for example, in the electrical mounting box (5), an air inlet (51) is provided at one end in the vertical direction, and an air outlet (52) is provided at the other end in the vertical direction. Moreover, a heating element (HPC) is, for example, disposed between the air inlet (51) and the air outlet (52) in the vertical direction.

[0045] More specifically, Figure 4 As shown, the air inlet (51) is, for example, located at the lower end of the electrical installation box (5), and the air outlet (52) is, for example, located at the upper end of the electrical installation box (5). However, the ventilation device (HRV) can be arranged in the opposite direction. In this case, the air inlet (51) is, for example, located at the upper end of the electrical installation box (5), and the air outlet (52) is, for example, located at the lower end of the electrical installation box (5).

[0046] Electrical installation box (5), for example, Figure 2 and Figure 4 As shown, it is positioned on the outside of the main housing (1). Specifically, the electrical mounting box (5), for example, Figure 2 As shown, on the outside of the main body housing (1), between the inner side wall (1a) of the main body housing (1) and the outlet (17) of the total heat exchanger (4), it is connected to the outside of the first side wall (1c) of the main body housing (1).

[0047] In addition, electrical installation box (5), for example, Figure 1 and Figure 4 As shown, the upper portion is adjacent to the air supply passage (16) via the first sidewall (1c) of the main housing (1), and the lower portion is adjacent to the exhaust passage (15) via the first sidewall (1c) of the main housing (1). In other words, the electrical installation box (5) is configured, for example, across the exhaust upstream portion (15a) of the upper and lower adjacent exhaust passages (15) and the air supply downstream portion (16b) of the air supply passage (16).

[0048] In addition, ventilation systems (HRV), for example, Figure 4As shown, it has a connection passage (6) that connects the air outlet (52) of the electrical installation box (5) to the air inlet (19a) of the partition wall (15c) of the exhaust passage (15) of the main body housing (1). Figure 4 The partition wall (15c) of the exhaust passage (15) with an air inlet (19a) shown is, for example, the lower part of the first side wall (1c) of the main housing (1). The connection passage (6) is, for example, defined between the first side wall (1c) of the main housing (1) and the side wall (5a) of the electrical installation box (5) with an air outlet (52), and is closed in all directions.

[0049] The side wall (5a) of the electrical installation box (5) that defines the connection passage (6) has an opening (59), for example, opposite the air inlet (19a) of the partition wall (15c) of the exhaust passage (15) provided in the main housing (1). This opening (59) is closed, for example, by a resin sealing member (59a). This sealing member (59a) has, for example, radial slits that can suppress the passage of air (A) and allow wiring to pass through.

[0050] Similarly, the first sidewall (1c) of the main housing (1) defining the connection passage (6) has an opening (19b), for example, at a position opposite to the air outlet (52) provided on the sidewall (5a) of the electrical installation box (5). This opening (19b) is closed, for example, by a resin sealing member (19c). This sealing member (19c), for example, similar to the sealing member (59a) that closes the opening (59) of the electrical installation box (5), has radially formed slits that can suppress the passage of air (A) while allowing wiring to pass through.

[0051] For example, in the air inlet (19a) of the main housing (1) and the opening (59) of the electrical mounting box (5), the wiring connecting the exhaust fan (2) provided in the exhaust passage (15) of the main housing (1) to the drive circuit (53) housed in the electrical mounting box (5) can be inserted. In addition, in the air outlet (52) of the electrical mounting box (5) and the opening (19b) of the main housing (1), the wiring connecting the air supply fan (3) provided in the air supply passage (16) of the main housing (1) to the drive circuit (54) housed in the electrical mounting box (5) can be inserted.

[0052] Alternatively, if the ventilation system (HRV) does not have a connection passage (6), the side wall (5a) of the electrical installation box (5) with the air outlet (52) can be shared with the first side wall (1c) of the main housing (1). In this case, the air outlet (52) of the electrical installation box (5) is, for example, located in the main housing (1) on the lower side of the first side wall (1c) of the partition wall (15c) that constitutes the exhaust passage (15). In this case, the air outlet (52) of the electrical installation box (5) functions as an air inlet (19a) opening into the partition wall (15c) of the exhaust passage (15). Furthermore, a heating element (HPC) is, for example, disposed between the air inlet (51) and the air outlet (52) of the electrical installation box (5).

[0053] An air inlet (51) for introducing air from outside the main housing (1) into the interior of the electrical installation box (5) may, for example, include multiple slits (51a) formed by the electrical installation box (5). Alternatively, the air inlet (51) may, for example, be a single slit extending in a horizontal direction. Furthermore, the air inlet (51) may, for example, be arranged in a grid pattern with multiple openings, and may be formed by multiple through holes in stamped metal (stamped metal mesh).

[0054] Furthermore, the air inlet (51) of the electrical installation box (5) is, for example, provided on the side wall (5c) of the electrical installation box (5). Additionally, the electrical installation box (5) has, for example, a generally rectangular shape and has four side walls (5a, 5b, 5c, 5d). The first side wall (5a) is, for example, opposite to the main body housing (1) of the electrical installation box (5). The second side wall (5b) is, for example, opposite to the first side wall (5a) of the electrical installation box (5). The third side wall (5c) is, for example, an indoor side wall facing the same direction as the indoor side wall (1a) of the main body housing (1). The fourth side wall (5d) is, for example, an outdoor side wall facing the same direction as the outdoor side wall (1b) of the main body housing (1). For example, an air inlet (51) can be provided in one or more of the four side walls (5a, 5b, 5c, 5d) of the electrical installation box (5).

[0055] Furthermore, the electrical installation box (5) has, for example, a partition (57) that separates the internal space of the heating element (HPC) housing the electrical installation box (5) from an air inlet chamber (56) that allows external air (A) to be introduced into the main housing (1) from the air inlet (51). The partition (57) has, for example, a ventilation hole (57a) in a space (OCS) within the ceiling where a ventilation device (HRV) is installed, overlapping the heating element (HPC) in the vertical direction.

[0056] The air intake chamber (56), for example, the ventilation system (HRV), is formed at one end of the electrical installation box (5) in the vertical direction, in a space (OCS) located within the ceiling. Specifically, Figure 4 In the configuration shown, the air intake chamber (56) is formed at the lower end of the electrical installation box (5). However, the ventilation system (HRV), for example, is sometimes combined with... Figure 4 The configuration shown is upside down. In this case, the air intake chamber (56) is formed, for example, at the upper end of the electrical installation box (5).

[0057] The function of the ventilation device (HRV) in this embodiment will be explained below.

[0058] As described above, the ventilation device (HRV) of this embodiment includes a main housing (1), an exhaust fan (2), an air supply fan (3), a total heat exchanger (4), and an electrical installation box (5). The exhaust fan (2) is provided in an exhaust passage (15) inside the main housing (1). The air supply fan (3) is provided in an air supply passage (16) inside the main housing (1). The total heat exchanger (4) is provided midway between the exhaust passage (15) and the air supply passage (16). The electrical installation box (5) is connected to the main housing (1) to house the heat-generating component (HPC). Furthermore, the electrical installation box (5) has an air inlet (51) for introducing air (A) from outside the main housing (1), and an air outlet (52) communicating with the exhaust passage (15) on an upstream side compared to the exhaust fan (2).

[0059] With this configuration, the ventilation device (HRV) of this embodiment can draw indoor air (RA) from the indoor space (IDS) to the exhaust passage (15) via the ventilation port (VD) provided on the ceiling (C) and the ventilation duct (VD). Furthermore, by operating the exhaust fan (2), the ventilation device (HRV) can cause the indoor air (RA) drawn in by the exhaust passage (15) to pass through the total heat exchanger (4) and be discharged to the outside as exhaust (EA) via the exhaust passage (15) and the exhaust duct (EAD) provided on the exterior wall of the building.

[0060] Furthermore, the ventilation system (HRV) operates the air supply fan (3), thereby drawing in outdoor air (OA) from the outdoor space to the air supply passage (16) via an external air inlet and an external air duct (OAD) located on the exterior wall of the building. Additionally, by operating the air supply fan (3), the HRV enables the outdoor air (OA) drawn in by the air supply passage (16) to undergo heat exchange and water molecule transfer between the total heat exchanger (4) and the indoor air (RA) exhausted to the outside. Furthermore, the HRV can supply the air (SA) that has passed through the total heat exchanger (4) after the outdoor air (OA) has passed through the air supply passage (16), via the air supply duct (SAD) and an air inlet located on the ceiling (C), to the indoor space (IDS).

[0061] Furthermore, in the ventilation device (HRV) of this embodiment, the electrical mounting box (5) housing the heating element (HPC) is connected to the main housing (1) and has an air outlet (52) communicating with the exhaust passage (15) on the upstream side compared to the exhaust fan (2). Therefore, when the exhaust fan (2) is operating, a negative pressure is generated on the upstream side of the exhaust passage (15) of the main housing (1) compared to the exhaust fan (2), and air inside the electrical mounting box (5) is drawn into the exhaust passage (15) of the main housing (1) from the air outlet (52) of the electrical mounting box (5).

[0062] As a result, air (A) from the air inlet (51) of the electrical mounting box (5), for example, air from the space inside the ceiling (OCS) or other external air of the main housing (1), flows from the air inlet (51) to the air outlet (52) inside the electrical mounting box (5). This air (A) cools the heat-generating components (HPCs) housed in the electrical mounting box (5). Therefore, the ventilation device (HRV) according to this embodiment can cool the heat-generating components (HPCs) without installing additional fans inside the electrical mounting box (5), thus suppressing cost increases.

[0063] Furthermore, the air outlet (52) of the electrical installation box (5) is connected to the exhaust passage (15) inside the main housing (1). Therefore, air (A) from outside the main housing (1) introduced from the air inlet (51) of the electrical installation box (5) can be discharged to the space outside the building through the exhaust passage (15) inside the main housing (1), via the exhaust duct (EAD) and the exhaust port. As a result, the reduction of the effective ventilation volume of the indoor space (IDS) can be suppressed. That is, the heat-generating component (HPC) can be cooled without deteriorating the effective ventilation volume according to the ventilation device (HRV) of this embodiment.

[0064] Furthermore, in the ventilation device (HRV) of this embodiment, the main housing (1) is connected to the first side wall (1c) via an outlet (17) provided with a total heat exchanger (4). In addition, the electrical installation box (5) is connected to the first side wall (1c) of the main housing (1).

[0065] This configuration improves the maintainability of the ventilation system (HRV). Specifically, the operating space of the ventilation system (HRV) adjacent to the first side wall (1c) of the main housing (1) located at the outlet (17) of the total heat exchanger (4), for example, including the inspection port (C1) of the canopy (C) for operator maintenance of the ventilation system (HRV), is ensured. Therefore, by connecting the electrical installation box (5) to the first side wall (1c) of the main housing (1), access to the electrical installation box (5) during maintenance becomes easier, and the maintainability of the ventilation system (HRV) is improved.

[0066] Furthermore, in the ventilation device (HRV) of this embodiment, the electrical installation box (5) is disposed on the outside of the main body housing (1).

[0067] This configuration ensures that the cross-sectional area of ​​the exhaust passage (15) and the air supply passage (16) is sufficient for efficient air exchange using the ventilation system (HRV). Furthermore, the increased flexibility in positioning the air inlet (51) in the electrical mounting box (5) that allows air (A) to enter the main housing (1) from the outside makes it possible to cool the heat-generating components (HPC) more effectively. Moreover, compared to placing the electrical mounting box (5) inside the main housing (1), access to the electrical mounting box (5) becomes easier, and its maintainability is improved.

[0068] Furthermore, the ventilation device (HRV) of this embodiment has a connection passage (6) that connects the air outlet (52) of the electrical installation box (5) and the air inlet (19a) that opens into the partition wall (15c) of the exhaust passage (15) inside the main body housing (1).

[0069] This configuration increases the freedom of positioning the air vent (52) in the electrical mounting box (5), making it possible to cool the heat-generating components (HPC) more effectively. Specifically, for example, Figure 4 As shown, even when an exhaust passage (15) is provided on the lower side of the main housing (1), it is possible to form an air outlet (52) for the electrical installation box (5) at a position opposite to the upper side of the main housing (1). As a result, it becomes easier to arrange the heating element (HPC) between the air inlet (51) and the air outlet (52), and it becomes possible to cool the heating element (HPC) more effectively.

[0070] Furthermore, in the ventilation device (HRV) of this embodiment, the air inlet (51) of the electrical installation box (5) includes a plurality of slits (51a) formed by the electrical installation box (5). With this configuration, the intrusion of foreign objects into the air inlet (51) of the electrical installation box (5) can be suppressed.

[0071] Furthermore, in the ventilation device (HRV) of this embodiment, the air inlet (51) of the electrical installation box (5) is provided on the side wall (5a, 5b, 5c, 5d) of the electrical installation box (5). With this configuration, it is possible to prevent water falling from above the ventilation device (HRV) from entering the air inlet (51).

[0072] Furthermore, in the ventilation system (HRV), the electrical installation box (5) has a partition (57) that separates the internal space housing the heating element (HPC) from the air inlet chamber (56) provided with the air inlet (51). The partition (57) has a vent (57a) disposed in the direction of air (A) at a position overlapping with the heating element (HPC). The heating element (HPC) is disposed between the vent (57a) and the air outlet (52) in the direction of air (A).

[0073] With this configuration, the air (A) introduced from the air inlet (51) of the electrical installation box (5) into the air inlet chamber (56) increases in velocity through the ventilation hole (57a) of the partition wall (57) that separates the internal space of the electrical installation box (5) containing the heat-generating component (HPC) from the air inlet chamber (56). Moreover, the heat-generating component (HPC) is cooled by the air (A) that increases in velocity through the ventilation hole (57a). As a result, the heat-generating component (HPC) can be cooled more effectively.

[0074] As explained above, according to this embodiment, the heat-generating components (HPCs) housed in the electrical installation box (5) can be cooled without the need for an additional fan, and a ventilation device (HRV) that can suppress cost increases can be provided.

[0075] [Implementation Method 2] The following is quoted Figures 1-3 , refer to Figure 5 This describes Embodiment 2 of the ventilation device involved in this disclosure.

[0076] Figure 5 This is Embodiment 2 of the ventilation device involved in this disclosure. Figure 4The corresponding enlarged cross-sectional view. The main difference between the ventilation device (HRV) of this embodiment and the ventilation device (HRV) of Embodiment 1 is that the electrical installation box (5) is located inside the main body housing (1). Other aspects of the ventilation device (HRV) of this embodiment are the same as those of the ventilation device (HRV) of Embodiment 1, therefore the same parts are marked with the same symbols and the description is omitted.

[0077] Figure 5 In the ventilation device (HRV) of this embodiment shown, the exhaust passage (15) inside the main housing (1) has an exhaust inlet (11) opening to the upstream end and an exhaust outlet (12) opening to the downstream end. Furthermore, the electrical installation box (5) is located inside the exhaust passage (15) in the exhaust upstream portion (15a) between the total heat exchanger (4) and the exhaust inlet (11). Additionally, a portion of the electrical installation box (5) can protrude outward from the main housing (1).

[0078] Specifically, for example, the electrical installation box (5) is installed inside the first side wall (1c) of the main housing (1) where the outlet (17) of the total heat exchanger (4) is provided. Through the first side wall (1c) of the main housing (1), a side wall (5b) is formed on the opposite side to the side wall (5a) of the electrical installation box (5) where the air outlet (52) is formed. An air inlet (51) for introducing air into the outside of the main housing (1) is formed in the side wall (5b) of the electrical installation box (5). Furthermore, the side wall (5b) of the electrical installation box (5) is provided to be openable and closable.

[0079] Furthermore, the upper part of the electrical installation box (5) is disposed inside the downstream part (16b) of the air supply passage (16), and the lower part of the electrical installation box (5) is disposed inside the upstream part (15a) of the exhaust passage (15). An air inlet (51) is provided at the lower end of the side wall (5b) of the electrical installation box (5), and an air outlet (52) is provided at the upper end of the side wall (5a) of the electrical installation box (5).

[0080] Furthermore, the ventilation system (HRV) has a connection passage (6) that connects the air outlet (52) of the electrical installation box (5) to the exhaust passage (15). The connection passage (6) includes, for example, a side wall (6a) opposite to the side wall (5a) of the electrical installation box (5), a bottom wall (6b) that closes the lower end of the connection passage (6), an upper wall (6c) that closes the upper end of the connection passage (6), a side wall (6d) that closes the indoor end of the connection passage (6), and a side wall that closes the outdoor end of the connection passage (6).

[0081] The side wall (6a) of the connection passage (6) opposite the side wall (5a) of the electrical installation box (5) having an air outlet (52) has a communication hole (61) that connects the interior space of the connection passage (6) with the interior space of the exhaust passage (15). The communication hole (61) of the connection passage (6) is provided, for example, at a position opposite to the opening (59) of the side wall (5a) on which the electrical installation box (5) is located. The wiring connecting the exhaust fan (2) of the exhaust passage (15) in the main housing (1) and the drive circuit (53) housed in the electrical installation box (5) can be inserted, for example, into the opening (59) of the electrical installation box (5) and the communication hole (61) of the connection passage (6).

[0082] Furthermore, the side wall (6a) of the connecting passage (6) has an opening (62) at a position opposite the air outlet (52) of the electrical installation box (5). This opening (62) is closed, for example, by a sealing member (62a) similar to the sealing member (59a). In the air outlet (52) of the electrical installation box (5) and the opening (62) of the connecting passage (6), for example, the wiring connecting the air supply fan (3) provided in the air supply passage (16) of the main housing (1) and the drive circuit (54) housed in the electrical installation box (5) can be inserted.

[0083] The function of the ventilation device (HRV) in this embodiment will be explained below.

[0084] The ventilation device (HRV) of this embodiment is similar to the ventilation device (HRV) of Embodiment 1 described above, including a main housing (1), an exhaust fan (2), an air supply fan (3), a total heat exchanger (4), and an electrical installation box (5). The exhaust fan (2) is provided in an exhaust passage (15) inside the main housing (1). The air supply fan (3) is provided in an air supply passage (16) inside the main housing (1). The total heat exchanger (4) is provided midway between the exhaust passage (15) and the air supply passage (16). The electrical installation box (5) is connected to the main housing (1) to house the heat-generating component (HPC). Furthermore, the electrical installation box (5) has an air inlet (51) for introducing air (A) from outside the main housing (1), and an air outlet (52) located upstream of the exhaust fan (2) and communicating with the exhaust passage (15).

[0085] Therefore, according to the ventilation device (HRV) of this embodiment, similarly to the ventilation device (HRV) of Embodiment 1 above, if the exhaust fan (2) is working, a negative pressure is generated on the upstream side compared to the exhaust fan (2) of the exhaust passage (15), and the air inside the electrical installation box (5) is drawn into the interior of the exhaust passage (15) of the main body housing (1) from the air outlet (52) of the electrical installation box (5).

[0086] As a result, air (A) from the air inlet (51) of the electrical mounting housing (5) is introduced into the exterior of the main housing (1). Inside the electrical mounting housing (5), the air (A) flows from the air inlet (51) to the air outlet (52). This air (A) cools the heat-generating components (HPCs) housed in the electrical mounting housing (5). Therefore, according to the ventilation device (HRV) of this embodiment, it is possible to eliminate the need for an additional fan to cool the heat-generating components (HPCs) inside the electrical mounting housing (5), thus suppressing cost increases.

[0087] Furthermore, the air outlet (52) of the electrical installation box (5) is connected to the exhaust passage (15) inside the main housing (1). Therefore, air (A) from outside the main housing (1) introduced from the air inlet (51) of the electrical installation box (5) can be discharged to the space outside the building through the exhaust passage (15) inside the main housing (1), via the exhaust duct (EAD) and the exhaust port. As a result, the reduction in the effective ventilation of the indoor space (IDS) can be suppressed.

[0088] Furthermore, in the ventilation device (HRV) of this embodiment, the exhaust passage (15) of the main housing (1) has an exhaust inlet (11) opening to the upstream end and an exhaust outlet (12) opening to the downstream end. In addition, the electrical installation box (5) is disposed inside the exhaust passage (15) between the total heat exchanger (4) and the exhaust inlet (11).

[0089] With this configuration, at least a portion of the electrical mounting box (5) can be disposed inside the main housing (1), allowing the air outlet (52) to communicate with the air inlet (51). Therefore, compared to the case where the entire electrical mounting box (5) is disposed outside the main housing (1), the ventilation device (HRV) can be miniaturized. Furthermore, even when the electrical mounting box (5) is disposed outside the main housing (1), by providing a recess in the first sidewall (1c) of the main housing (1) and disposing of the electrical mounting box (5) in this recess, the ventilation device (HRV) can be miniaturized.

[0090] Furthermore, a portion of the electrical installation box (5) can be disposed inside the exhaust passage (15), while the other portion protrudes outward from the main housing (1). In this case, an air inlet (51) is formed on the side wall (5b, 5c, 5d) of the electrical installation box (5) located on the outside of the main housing (1), which can increase the opening area of ​​the air inlet (51).

[0091] Furthermore, the ventilation device (HRV) of this embodiment has a connection passage (6) that connects the air outlet (52) of the electrical installation box (5) to the exhaust passage (15).

[0092] This configuration increases the freedom of positioning the air vent (52) in the electrical mounting box (5), allowing for more effective cooling of the heat-generating components (HPC). Specifically, for example, Figure 5 As shown, even when an exhaust passage (15) is provided on the lower side of the main housing (1), an air outlet (52) for the electrical installation box (5) can be formed at a position opposite to the air supply passage (16) on the upper side of the main housing (1). This makes it easier to place the heating element (HPC) between the air inlet (51) and the air outlet (52), and allows for more effective cooling of the heating element (HPC).

[0093] As explained above, according to this embodiment, the heat-generating components (HPCs) housed in the electrical installation box (5) can be cooled without installing an additional fan in the electrical installation box (5), and a ventilation device (HRV) that can suppress cost increases can be provided.

[0094] The preferred embodiments of this disclosure have been described in detail above. However, this disclosure is not limited to the above embodiments. Various modifications or substitutions can be made to the above embodiments without departing from the scope of this disclosure. Furthermore, the features described separately can be combined as long as there is no technical contradiction.

[0095] This application claims priority based on Japanese Patent Application No. 2024-015943, filed on February 5, 2024, the entire contents of which are incorporated herein by reference.

[0096] Explanation of symbols 1 Main body shell 1c First lateral wall 11 exhaust inlets 12 exhaust outlets 15 Exhaust passages 15c next door 16 air supply passages 17. Take out the exit 19a air intake 2 exhaust fans 3 air supply fans 4 Total Heat Exchangers 5 Electrical Installation Box 5a sidewall 5b sidewall 5c sidewall 5d sidewall 51 Air Inlet 51a slit 52 air exhaust outlets 6 connection paths A air HPC heating element HRV ventilation system

Claims

1. A ventilation device (HRV) comprising: Main body shell (1), An exhaust fan (2) is provided in the exhaust passage (15) inside the main housing (1). An air supply fan (3) is installed in the air supply passage (16) inside the main housing (1). A total heat exchanger (4) is located midway between the exhaust passage (15) and the supply passage (16), and An electrical mounting box (5) is connected to the main housing (1) to house the heating element (HPC). The electrical installation box (5) has an air inlet (51) for introducing air (A) from the outside of the main housing (1) and an air outlet (52) connected to the exhaust passage (15) on the upstream side relative to the exhaust fan (2).

2. The ventilation device (HRV) according to claim 1, The main housing (1) has a first sidewall (1c) on which the outlet (17) of the total heat exchanger (4) is disposed. The electrical installation box (5) is connected to the first side wall (1c).

3. The ventilation device (HRV) according to claim 1 or 2, The exhaust passage (15) has an exhaust inlet (11) opening to the upstream end and an exhaust outlet (12) opening to the downstream end. The electrical installation box (5) is located inside the exhaust passage (15) between the total heat exchanger (4) and the exhaust inlet (11).

4. The ventilation device (HRV) according to claim 3, comprising: A connection passage (6) that connects the air outlet (52) of the electrical installation box (5) to the exhaust passage (15).

5. The ventilation device (HRV) according to claim 1 or 2, The electrical installation box (5) is located on the outside of the main housing (1).

6. The ventilation device (HRV) according to claim 5, comprising: A connection passage (6) that connects the air outlet (52) of the electrical installation box (5) to the air inlet (19a) that opens into the partition (15c) of the exhaust passage (15).

7. The ventilation device (HRV) according to any one of claims 1 to 6, The air inlet (51) of the electrical installation box (5) includes a plurality of slits (51a) formed in the electrical installation box (5).

8. The ventilation device (HRV) according to any one of claims 1 to 7, The air inlet (51) of the electrical installation box (5) is provided on the side wall (5a, 5b, 5c, 5d) of the electrical installation box (5).

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