Ventilation system and method for manufacturing the same

Abstract

To provide a ventilation system capable of inhibiting deterioration of ventilation performance.SOLUTION: A ventilation system 20 includes: an air supply duct 21 which introduces air in an outdoor space into an indoor space 12; an exhaust duct 22 which exhausts air in the indoor space 12 to the outdoor space; and a heat exchanger 30 which conducts heat exchange between air in the air supply duct 21 and air in the exhaust duct 22. The heat exchanger 30 includes a case 32 and a heat exchange element 31 housed in the case 32 and includes a removal part 55 in a state that a blower 35 in the heat exchanger 30 is removed. A duct 40 with a blower, including a duct part 41 and a duct internal blower 45 for blowing air in the duct part 41, is connected to at least one of the air supply duct 21 and the exhaust duct 22.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a ventilation system. [Background technology]

[0002] Conventionally, a ventilation system for ventilating the inside of a building is known. This type of ventilation system includes an air supply duct that supplies outdoor air to the room and an exhaust duct that exhausts indoor air to the outside. The air supply duct and the exhaust duct are connected to a heat exchanger, and the air in the air supply duct and the air in the exhaust duct are heat exchanged in the heat exchanger.

[0003] The ventilation system of the following Patent Document 1 includes a heat exchange element, an intake fan that draws in outdoor air and exhausts it indoors, and an exhaust fan that draws in indoor air and exhausts it outdoors, all of which are housed in a total heat exchanger. Motors that drive the intake fan and exhaust fan are attached to the housing of the total heat exchanger. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2006-337015 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the configuration described above of having a blower consisting of a motor and a fan inside the heat exchanger reduces the free space inside the heat exchanger by the size of the blower, which causes poor air flow inside the heat exchanger and reduces ventilation performance.

[0006] The present invention is devised to solve the above-mentioned problems, and has an object to provide a ventilation system capable of suppressing a decrease in ventilation performance. [Means for solving the problem]

[0007] The present invention is a ventilation system comprising an air supply duct that introduces outdoor air into a room, an exhaust duct that exhausts air from the room to the outdoors, and a heat exchanger that exchanges heat between the air in the air supply duct and the air in the exhaust duct, wherein the heat exchanger comprises a case and a heat exchange element housed in the case, and also has a removal section in which the blower in the heat exchanger is removed, and a duct with a blower is connected to at least one of the air supply duct and the exhaust duct, the duct comprising a duct section and an in-duct blower that blows air within the duct section.

[0008] According to this configuration, the heat exchanger is in a state where the blower in the heat exchanger is removed, so the free space in the case is increased by the amount of the blower, and the air flow in the heat exchanger can be improved. Also, even if the blower in the heat exchanger is removed, the duct fan of the blower-equipped duct can blow air in the duct. This allows the duct fan to blow air inside the duct while improving the air flow inside the heat exchanger, making it possible to suppress a decrease in ventilation performance.

[0009] The present invention is a manufacturing method for a ventilation system comprising an intake air duct that introduces outdoor air into a room, an exhaust duct that exhausts air from the room to the outdoors, and a heat exchanger that exchanges heat between the air in the intake air duct and the air in the exhaust duct, and comprises a case and a heat exchange element housed in the case, and the method comprises a removal process for removing a blower attached to the case, and a connection process for connecting a duct with a blower, which includes a duct section and an in-duct blower that blows air within the duct section, to at least one of the intake air duct and the exhaust duct.

[0010] According to the above configuration, by removing the blower attached to the case of the heat exchanger, the free space in the case is increased by the amount of the blower, and the air flow in the heat exchanger can be improved. Also, even if the blower of the heat exchanger is removed, the air can be blown in the duct by the in-duct blower of the blower-equipped duct. This allows the duct fan to blow air inside the duct while improving the air flow inside the heat exchanger, making it possible to suppress a decrease in ventilation performance.

[0011] In addition to the above configuration, it is preferable to have the following embodiment. An inspection hatch is provided in the wall between the indoor and outdoor areas, and the size of the inspection hatch is such that the heat exchanger does not pass through it, but the duct with the blower can pass through it. When the blower of the heat exchanger breaks down, it may be impossible to obtain the same blower due to discontinuation of production of the blower. In such a case, it would be good to replace the heat exchanger as a whole, but if the heat exchanger is larger than the inspection hatch, it may be difficult to carry the heat exchanger in and out through the inspection hatch. According to the above configuration, a ventilation system can be configured by removing the blower of the heat exchanger and connecting it to the intake duct or exhaust duct through the duct with the blower from the inspection hatch. This makes it possible to repair the ventilation system without replacing the entire heat exchanger.

[0012] A support member is provided for supporting the duct with a fan in a suspended state relative to the building at a position where the duct with a fan does not contact the wall between the indoor and outdoor areas, and at least one of the intake duct and the exhaust duct is connected to the duct with a fan in a bent state so as to bypass the route. In some cases, it is not easy to place a duct with a blower on a ceiling or wall due to placement restrictions. According to this configuration, the duct with a blower is supported in a suspended state from the building, so that the duct with a blower can be installed even when there are placement restrictions, and the surrounding space makes it easy to maintain the duct with a blower. Even if the duct with a blower is installed in such a place, at least one of the intake duct and the exhaust duct is bent to make a detour, so that the intake duct and the exhaust duct can be connected to the duct with a blower without changing the position of the heat exchanger.

[0013] The duct with a fan is connected to each of the intake air duct and the exhaust air duct, and the in-duct fan of the duct with a fan connected to the intake air duct has a larger maximum air volume than the in-duct fan of the duct with a fan connected to the exhaust duct. In this way, by setting both the duct fan connected to the intake air duct and the duct fan connected to the exhaust air duct to maximum airflow, positive pressure can be created in the room, thereby preventing dirty air from entering the room.

[0014] The air intake duct and the air exhaust duct are each connected to a duct with a blower, and the air intake duct is provided with an operation switch that can adjust the air volume of each of the plurality of ducts with a blower. In this way, the air volume in each duct can be adjusted by operating the operation switch, so that it is possible to configure a first to third type heat exchange ventilation system.

[0015] Prior to the removal process, the blower is connected via an electric wire to a controller and an operation switch for controlling the blower, and in the removal process, the electric wire is cut and the blower attached to the case is removed, and the electric wire connected to the operation switch is connected to the in-duct blower in the blower-equipped duct. In this way, the electric wire connected to the operating switch can be reused for the ventilation system.

[0016] The removing step is for removing screws for fixing the blower, and includes a sealing step for attaching a sealing member to the case so as to cover an area including the screws. In this way, air leakage and heat loss can be suppressed with a simple configuration.

[0017] The blower is driven by an AC motor and the in-duct blower is driven by a DC motor. For the blower motor, a DC motor is preferable over an AC motor because it reduces power consumption, but it is not easy to change the blower in the heat exchanger to a DC motor due to restrictions such as the case shape and wiring. On the other hand, with this configuration, in the event of a breakdown in the blower motor, a duct with a blower equipped with a DC motor can be used to easily replace the motor with a DC motor, and using a DC motor can reduce power consumption during operation. Effect of the Invention

[0018] It becomes possible to suppress the deterioration of the ventilation performance in the ventilation system. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 shows a ventilation system in a building according to an embodiment. [Diagram 2] Plan view showing the heat exchanger [Diagram 3] FIG. 1 is a side view showing a state in which the blower-equipped duct is supported by a support member; [Figure 4] Side view of the heat exchanger before removing the blower [Diagram 5] FIG. 3 is a partially omitted view of the blower side before the blower is removed at the position AA in FIG. 2. [Figure 6] A plan view showing the heat exchanger disassembled and the blower removed. [Figure 7] FIG. 1 shows a ventilation system with a blower in a heat exchanger. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] As shown in Fig. 1, the ventilation system 20 is installed in a building 10 (e.g., two-story building; the lower floors are omitted in Fig. 1), and the building 10 is provided with an intake 16 for taking outdoor air OA into the room 11, and an exhaust 17 for exhausting air from the room 11 to the outdoors. The building 10 has a number of rooms (one room on the second floor is shown in Fig. 1, and the other rooms on the second floor are omitted), and the upper side of the room 12 is partitioned off by a ceiling wall 14 (an example of a "wall between the room and the outdoors"). The space above the ceiling wall 14 is defined as an attic 13 (attic space), and the ventilation system 20 is installed in the space of the attic 13.

[0021] The ceiling wall 14 is provided with an intake port 18 for drawing in air RA from the room 12 for ventilation, and an outlet port 19 for blowing air SA into the room 12. The intake port 18 and the outlet port 19 are also installed in the ceiling walls of other rooms on the same floor (not shown) and in ceiling walls of other floors. As the ceiling walls of other rooms, they may be installed in the ceiling walls of a bathroom, toilet, kitchen, etc.

[0022] An air supply duct 21 is provided in the air supply path between the intake port 16 and the air outlet 19, and outdoor air OA passes through the air supply duct 21 and is introduced into the room 12 from the air outlet 19. An exhaust duct 22 is provided in the exhaust path between the intake port 18 and the exhaust port 17, and air RA in the room 12 passes through the exhaust duct 22 and is exhausted to the outdoors from the exhaust port 17.

[0023] The ventilation system 20 includes an air supply duct 21, an exhaust duct 22, a filter box 25, a heat exchanger 30, and a duct with a blower 40. The air supply path between the intake port 16 and the air outlet 19 is connected by the air supply duct 21 via the filter box 25 and the heat exchanger 30. The exhaust path between the intake port 18 and the exhaust port 17 is connected by the exhaust duct 22 via the filter box 25 and the heat exchanger 30.

[0024] Both the air supply duct 21 and the exhaust duct 22 are made of cylindrical insulation (heat retaining material, e.g., 25 mm thick) covered with metal foil (e.g., aluminum foil), and are flexible ducts (e.g., 100 mm or 150 mm in diameter) whose paths can be bent due to their flexibility.

[0025] Heat exchanger 30 exchanges heat between the air in intake duct 21 and the air in exhaust duct 22. Various products can be used for heat exchanger 30, but the following description will be given taking as an example a sensible heat type heat recovery ventilation unit (DENSO CORPORATION, product number "HRJ250") that exchanges heat of air but does not exchange moisture.

[0026] The heat exchanger 30 includes a heat exchange element 31 and a case 32 that houses the heat exchange element 31. The heat exchange element 31 has a diamond-shaped outer shape with a predetermined thickness (corresponding to the thickness dimension of the case 32) and is formed by laminating a material such as a moisture- and odor-resistant synthetic resin.

[0027] 2, the case 32 is made of synthetic resin and includes a box-shaped storage section 33 in which the heat exchange element 31 is stored, a pair of left and right side sections 36 arranged adjacent to the storage section 33 so as to follow both side surfaces of the storage section 33, and a lid section 39 that covers an opening on the top surface of the storage section 33. In the following description, the top of FIG. 2 is referred to as the front, the left as the left, and the front side of the paper as the top.

[0028] As shown in Fig. 6, the accommodation section 33 includes a bottom surface section 33A on which the heat exchange element 31 is placed, and a square cylindrical surrounding wall 33B rising from the peripheral edge of the bottom surface section 33A. The bottom surface section 33A is in the shape of a rectangular flat plate. Four cylindrical duct connection sections 34A protrude in the axial direction from the front side (upper side in Fig. 6) of the surrounding wall 33B (the lower two duct connection sections 34A overlap the upper two duct connection sections 34A in Fig. 6). The space inside the duct connection sections 34A communicates with the space inside the accommodation section 33. A circular through hole 33F (see Fig. 5) is formed in the rear part of the surrounding wall 33B on the left and right side sections 36 side.

[0029] As shown in FIG. 6, fastening portions 33C having screw holes for screwing the lid portion 39 are formed at the four corner positions on the upper surface of the surrounding wall 33B. On the outer surface of the surrounding wall 33B on the left and right side portions 36 side, electric wire passing portions 33D extend linearly along the side portions 36. The electric wire passing portion 33D is in a rectangular tube shape, and an electric wire W1 for driving the blower 35 (the blower before removal) in the heat exchanger 30 is passed through the inside of the electric wire passing portion 33D. A connector portion 33E to which a terminal T1 of an electric wire terminal can be connected is formed at the front end portion of the electric wire passing portion 33D. By connecting the terminal T1 to the connector portion 33E, it is possible to supply power to the blower 35 before removal.

[0030] The blower 35 is a fan motor in which a fan section and a motor section are integrally assembled, and has an overall cylindrical outer shape. The shape of the fan section of the blower 35 is, for example, a blower fan (sirocco fan) whose suction direction and discharge direction differ by 90 degrees, but is not limited thereto, and may be another axial flow (propeller) fan, etc. The motor section of the blower 35 is an AC motor (alternating current motor) that is driven by AC power at a rotation speed according to the frequency, and is connected to an electric wire W for supplying driving power. Before removing the blower 35, the electric wire W was integrally connected to the electric wire W1 passing through the electric wire passing portion 33D, but was cut by a tool TL when removing the blower 35.

[0031] Each of the pair of side portions 36 includes a cover portion 37 that covers the blower 35, and a tubular portion 36A that is connected to the cover portion 37 and extends forward in a cylindrical shape. The tip of the tubular portion 36A is a duct connection portion 34B to which the intake duct 21 or the exhaust duct 22 is connected.

[0032] Cover portion 37 has a cylindrical shape corresponding to the outer shape of blower 35, and has a pair of plate-like portions 37A, 37B facing each other so as to sandwich blower 35, and an annular portion 37C connecting peripheral portions of the pair of plate-like portions 37A, 37B. When blower 35 is driven with blower 35 housed inside cover portion 37, air inside is blown.

[0033] 4, a rectangular through hole 37D is formed in plate-shaped portion 37A on the outer side (opposite storage portion 33) of cover portion 37 on the pair of side portions 36. A metal plate 38 is placed from the outside over the position of through hole 37D in plate-shaped portion 37A, and the position is covered by metal plate 38 so that through hole 37D cannot be seen. Before blower 35 is removed, the area of ​​metal plate 38 that overlaps with through hole 37D is fastened to blower 35 at four locations with screws BT1.

[0034] On the other hand, when the blower 35 is removed from the cover portion 37, the metal plate 38 is not fixed by the screws BT1 because there is no blower 35 to attach, and therefore the area where the through holes 37D overlap with the four screws BT1 is not screwed, and the metal plate 38 is fixed by screwing it to the area where the plate-shaped portion 37A overlaps with the four screws TB (dotted lines TB in Figure 4).

[0035] 5, a communication hole 37F that communicates with the space inside the storage section 33 is formed in the plate-shaped section 37B on the inner side (the storage section 33 side). The air that has exchanged heat through the heat exchange element 31 inside the storage section 33 passes through the through hole 33F of the storage section 33 and the communication hole 37F of the cover section 37, and is guided to the corresponding duct from the cylindrical section 36A of the side section 36. Here, after the blower 35 is removed, the free space (cross-sectional area in the direction perpendicular to the direction in which the air flows) inside the cover section 37 becomes larger by the amount of the blower 35, so that the obstacles to the air flow are reduced and the air flow improves.

[0036] 1, filter box 25 contains a filter that removes dust from the air, and the inside is divided by partition plate 25A. Outdoor air OA taken in from intake port 16 circulates on one side of filter box 25 divided by partition plate 25A, and indoor air RA sucked in from intake port 18 circulates on the other side.

[0037] A pair of ducts 40, 40 equipped with fans are connected to the downstream side of the heat exchanger 30 of each of the intake duct 21 and the exhaust duct 22. Each duct 40 equipped with a fan is also called a (middle-mounted) duct fan, and in this embodiment, the same one is used on the intake duct 21 side and the exhaust duct 22 side, and both include a duct portion 41 and an in-duct fan 45 that blows air inside the duct portion 41, as shown in FIG.

[0038] The duct section 41 includes a rectangular cylindrical main body 42 and duct connection parts 43, 49. The main body 42 is formed by punching and bending a metal plate material, and is formed so that the air inside is blown downstream by an in-duct fan 45. One of the duct connection parts 43 is cylindrical, and is attached to the main body 42 via a mounting plate (not shown) attached to the downstream opening of the main body 42. On the opposite side of the duct connection part 43 in the main body 42, a cylindrical duct connection part 49 formed integrally with the main body 42 is provided. A terminal case 44 is provided on the bottom surface of the main body 42. The terminals in the terminal case 44 are connected to the operation switch 60A and the terminals of the end parts of the electric wires W2 (e.g., three wires) connected to the power source. Although a single operation switch 60A can be used to turn on and off multiple blower-equipped ducts 40, the present invention is not limited to this. For example, as shown in FIG. 1, another operation switch 60B may be provided, and the operation of two blower-equipped ducts 40 may be controlled by the operation switch 60A and the operation switch 60B, respectively.

[0039] The duct blower 45 is a fan motor in which a fan and a motor are integrally assembled. For example, a DC brushless motor (direct current motor) can be used as the motor, and for example, AC power from a commercial power source (100 [V]) can be converted to DC by a rectifier provided in the blower-equipped duct 40 to drive the motor with DC. The operation switch 60A (60B) is connected to multiple terminals in the terminal case 44 via electric wires W2 (multiple electric wires), and the terminals in the terminal case 44 receive power from the commercial power source to drive the motor. Here, the duct blower 45 connected to the air supply duct 21 has a higher maximum output and a larger maximum air volume than the duct blower 45 connected to the exhaust duct 22. The operation switch 60A (60B) can set the air volume up to the maximum air volume for each duct blower 45, and the air volume can be adjusted by operating the operation switch 60A (60B). As shown in FIG. 3, the blower-equipped duct 40 is supported by a support member 47 in the ceiling space 13.

[0040] Support member 47 has a vertical axis and a plurality of rod-shaped first hanging parts 47A whose upper ends are fixed to rafters or eaves beams of building 10 for hanging, a support rod 47B having a left-right axis and having the lower ends of the plurality of first hanging parts 47A fixed thereto and the left and right ends fixed to pillars of building 10, and a plurality of second hanging parts 47C having a vertical axis and having upper ends fixed to support rod 47B for hanging from support rod 47B. The lower ends of the four second hanging parts 47C are fastened and fixed by bolts or the like to fastening parts 48 provided at four places on the upper surface of each blower-equipped duct 40.

[0041] In a state where the ducts 40, 40 with fans are supported by the support member 47, the ducts 40, 40 with fans are fixed at a position at a predetermined height relative to the ceiling wall 14. That is, each duct 40 with fans is supported at a position where it does not contact the ceiling wall 14. The air supply duct 21 has a pair of bent portions 21A, 21B that are bent so as to detour between the heat exchanger 30 and the outlet 19, and the ends of the bent portions 21A, 21B are connected to the duct connection portions 43, 49 of the (one) duct with fans 40. The exhaust duct 22 has a pair of bent portions 22A, 22B that are bent so as to detour between the heat exchanger 30 and the outlet 17, and the ends of the bent portions 22A, 22B are connected to the duct connection portions 43, 49 of the (other) duct with fans 40. Duct connecting parts 43, 49 are inserted into the ends of bent parts 21A, 21B (22A, 22B), and are fastened from the outside with fastening members 50. In addition, in Fig. 3, air supply duct 21 and exhaust duct 22 before bending (before cutting) are shown by two-dot chain lines.

[0042] As shown in FIG. 1, an inspection hatch 57 is provided below the blower-equipped duct 40 in the ceiling wall 14 (the wall between the room 12 and the outside of the room) and penetrates the ceiling wall 14. The inspection hatch 57 is rectangular and large enough for an operator to pass through, and is normally closed with an openable cover. The size of one side (e.g., long side) of the inspection hatch 57 is larger than the size of one side (e.g., long side) of the end face of the blower-equipped duct 40 on the duct connection parts 43, 49 side, and smaller than the size of one side (e.g., long side) of the bottom face of the heat exchanger 30. Specifically, for example, the inspection hatch 57 can be a square of 450×450 mm, the outer diameter of the end face of the blower-equipped duct 40 on the duct connection parts 43, 49 side can be 275×280 mm, and the bottom face of the heat exchanger 30 can be a square of 600×600 mm. That is, the size of the inspection hatch 57 is set so that the heat exchanger 30 does not pass through it, but the blower duct 40 can pass through it.

[0043] A method for manufacturing the ventilation system 20 will now be described. As shown in FIG. 7, a ventilation system BA1 is installed in the attic 13 of a building 10. The ventilation system BA1 includes an air supply duct 21, an exhaust duct 22, a filter box 25, and a heat exchanger BA2. The heat exchanger BA2 has two fans 35 attached in a case 32. The two fans 35 blow air in the heat exchanger BA2, and are provided on the air supply duct 21 side and the exhaust duct 22 side, respectively, and blow air that has been heat exchanged in the heat exchanger BA2 to the room 12 or outdoors. The two fans 35 are connected to a controller 61 and an operation switch 60A via an electric wire W. The controller 61 is installed in the attic 13, and the operation switch 60A is installed in the room 12. The controller 61 and the operation switch 60A are connected by an electric wire W. A board is housed in the controller 61, and power is supplied from a commercial power source (AC 100V). By operating the operation switch 60A, the operations of the two fans 35 are controlled via the controller 61.

[0044] Here, for example, in the ventilation system BA1, when the motor of the blower 35 of the heat exchanger BA2 breaks down, the following steps are carried out. (Removal process) The worker enters the attic 13 and uses a tool such as a screwdriver to remove the four screws BT2 of the lid 39 that covers the storage unit 33 (FIG. 2). Then, the worker removes the lid 39 and takes out the heat exchange element 31 from the storage unit 33 (FIG. 6). Next, as shown in FIG. 5, the worker inserts a tool such as a screwdriver inside the storage unit 33 and uses the tool such as a screwdriver to remove the four screws BT3 that fasten the side portion 36. This releases the side portion 36 from the storage unit 33.

[0045] As shown in Fig. 4, when the four screws BT1 fastening the metal plate 38 on the side portion 36 of the heat exchanger 30 are removed using a tool such as a screwdriver, the metal plate 38 is peeled off, and the blower 35 is released from the side portion 36. Then, as shown in Fig. 6, the electric wire W (W1) for driving the motor connected to the blower 35 is cut with a tool TL, the side portion 36 is detached from the accommodation portion 33, and the blower 35 is taken out from the inside of the side portion 36. As a result, the blower 35 is separated from the accommodation portion 33 and the side portion 36. The electric wire W1 left on the heat exchanger 30 side by cutting the electric wire W and the cover portion 37 on the side portion 36 from which the blower 35 has been removed are an example of the "removal portion 55" from which the blower 35 has been removed.

[0046] (Assembly process) As shown in FIG. 4, the position on the outside of the side portion 36 where the metal plate 38 was removed is covered again with the metal plate 38, and the metal plate 38 is screwed to the resin part of the side portion 36 (the part outside the through hole 37D in FIG. 4) with a plurality of (four in this embodiment) tex screws TB. This fixes the metal plate 38 to the side portion 36. Next, a sheet-like sealing member 53 is attached so as to cover the entire metal plate 38, so as to prevent air from leaking from the screw hole for the screw BT1. The sealing member 53 is flexible and deformable, and is formed by bonding a sheet-like heat-retaining and insulating seal material and a metal foil (aluminum tape, etc.) with an adhesive or the like. Then, the heat exchange element 31 is returned to the inside of the housing portion 33, the lid portion 39 is closed, and the lid portion 39 is screwed with the screw BT2 (see FIG. 2 and FIG. 6). This forms the heat exchanger 30 with the blower 35 removed.

[0047] (Connection process) The worker puts the two prepared ducts with blowers 40 into the attic 13 from the room 12 through the inspection hatch 57. In the attic 13, a support member 47 is fixed to the building 10. The worker fastens and fixes the fastened parts 48 of each duct with blowers 40 to the lower end of the second suspended part 47C of the support member 47 with fastening members such as bolts. This results in the ducts with blowers 40 being fixed at a predetermined height relative to the ceiling wall 14.

[0048] Next, of the intake air duct 21 and the exhaust duct 22 that are laid under the ceiling 13, the intake air duct 21 between the heat exchanger 30 and the air outlet 19, and the exhaust duct 22 between the heat exchanger 30 and the air outlet 17 are each cut off using a cutting tool TL. The corresponding duct connections 43, 49 of each blower-equipped duct 40 are inserted into the respective terminal portions of the cut intake air duct 21 and the exhaust duct 22, and the terminal portions of the intake air duct 21 and the exhaust duct 22 are fixed by binding them with a binding member 50. Furthermore, if, when the intake air duct 21 and the exhaust air duct 22 are separated, the length of the duct to connect the intake air duct 21 or the exhaust air duct 22 to the duct with a blower 40 is insufficient, a duct made of the same material as the intake air duct 21 and the exhaust air duct 22 can be prepared, and this duct can be connected to the part of the length that is insufficient and then connected to the duct connection parts 43, 49 of the duct with a blower 40.

[0049] (Wiring process) As shown in Fig. 6, the terminal T1 of the electric wire end portion is removed from the connector portion 33E, and the controller 61 (Fig. 7) connected to the electric wire W (W1) is removed. As shown in Fig. 1, the operation switch 60A (60B) is connected to a terminal in the terminal case 44 of the blower-equipped duct 40 via the electric wire W2 (see Fig. 3). If the length of the electric wire W2 is insufficient, it is extended by connecting another electric wire, etc. Thus, each blower-equipped duct 40 operates in response to the operation of the operation switch 60A (60B).

[0050] When both ducts 40, 40 with blowers are operated, a first type heat exchange type ventilation system is formed, when only the duct 40 with blower on the supply side is operated, a second type heat exchange type ventilation system is formed, and when only the duct 40 with blower on the exhaust side is operated, a third type heat exchange type ventilation system is formed.

[0051] The ventilation system 20 starts operation when the blower-equipped duct 40 is driven. When the operation of the duct with a blower 40 is started, the air OA to be supplied to the room 12 is taken in through the intake 16, and the air RA in the room 12 to be exhausted is taken in through the intake port 18. The air OA taken in through the intake port 16 has dust filtered out by a filter in the filter box 25, and then passes through the heat exchanger 30 and the duct with a blower 40, and is blown out through the outlet 19 into the room 12. The air RA in the room 12 taken in through the intake port 18 has dust filtered out by a filter in the filter box 25, and then passes through the heat exchanger 30 and the duct with a blower 40, and is exhausted to the outdoors through the exhaust port 17. When passing through the heat exchanger 30, heat is exchanged between the outdoor air OA and the air RA in the room 12.

[0052] According to this embodiment, the heat exchanger 30 includes a removal section 55 in a state where the blower 35 in the heat exchanger 30 is removed (the "cut electric wires W1 and the cover section 37 of the case 32" are an example of a "removal section"). This increases the free space in the case 32 by the absence of the blower 35, and improves the air flow in the heat exchanger 30. Even if the blower 35 in the heat exchanger 30 is removed, the in-duct blower 45 of the blower-equipped duct 40 can blow air in the duct. This allows the in-duct blower 45 to blow air in the duct while improving the air flow in the heat exchanger 30, making it possible to suppress a decrease in ventilation performance.

[0053] In addition, by connecting a duct 40 equipped with a large-volume type in-duct blower 45 to the intake duct 21 or exhaust duct 22 as necessary, it is possible to increase the air volume and improve ventilation performance.

[0054] Also, by removing the blower 35 from the heat exchanger 30 and connecting it to the intake duct 21 and the exhaust duct 22 through the duct with blower 40 from the inspection hatch 57, the ventilation system 20 can be constructed. This makes it possible to repair the ventilation system 20 without replacing the entire heat exchanger 30 (even if the blower 35 is no longer available due to discontinuation of production, etc.).

[0055] In addition, since the duct with blower 40 is supported in a suspended state relative to the building 10 by the support member 47, the duct with blower 40 can be installed even when there are restrictions on placement, and since the supply air duct 21 and the exhaust air duct 22 are bent to make a detour, it is possible to connect the supply air duct 21 and the exhaust air duct 22 to the duct with blower 40 without changing the position of the heat exchanger 30.

[0056] Further, the duct fan 45 on the intake duct 21 side has a larger maximum air volume than the duct fan 45 on the exhaust duct 22 side. As a result, by operating one or more operation switches 60A, 60B to set both the duct fan 45 on the intake duct 21 side and the duct fan 45 on the exhaust duct 22 side to their maximum air volumes, the room 12 can be made to have a positive pressure, thereby suppressing the inflow of dirty air into the room 12.

[0057] Furthermore, since the air volume in each duct can be adjusted by operating the operation switches 60A, 60B, it is possible to configure the ventilation system 20 of the first to third types of heat exchanger.

[0058] In addition, the removal process involves removing the screw BT1 for fixing the blower 35, and includes a sealing process in which the sealing member 53 is attached to the case 32 so as to cover the area including the screw BT1. This makes it possible to suppress air leakage and heat loss from screw holes, etc. with a simple configuration.

[0059] Furthermore, in the event of a breakdown in the motor of the blower 35, by using the blower-equipped duct 40 equipped with a DC motor, it is possible to easily replace the AC motor with a DC motor, and by using a DC motor, it is possible to reduce power consumption during operation.

[0060] <Other embodiments> The technology described in this specification is not limited to the embodiments described in the above description and drawings, and for example, the following embodiments are also included in the technical scope of the technology described in this specification. (1) In the above embodiment, the heat exchanger 30 is a sensible heat exchanger. However, the present invention is not limited to this and may be a total heat exchanger that exchanges both heat and moisture.

[0061] (2) Although the heat exchanger 30 is configured so that the blowers 35 housed within the side portions 36 can be removed, this is not limited to the above. For example, a heat exchanger that does not have side portions 36 and has a pair of blowers 35 entirely housed within a box-shaped housing portion may be configured so that the pair of blowers 35 can be removed from the housing portion to form a ventilation system. (3) Although the fan-equipped duct 40 is configured to be supported by the support member 47, this is not limited to the above. For example, the fan-equipped duct 40 may be placed on the ceiling space 13 without the support member 47.

[0062] (4) Although blower 35 is a fan motor in which the fan and the motor are integrally configured, the present invention is not limited to this, and the fan and the motor may be configured separately. In this case, for example, only the motor (blower) may be removed, and detachable portion 55 may be configured by the motor, electric wires, etc. (5) In the above embodiment, the ducts with fans 40, 40 are connected to both the intake air duct 21 and the exhaust air duct 22, but the present invention is not limited thereto, and the ducts with fans 40 may be provided in the intake air duct 21 or the exhaust air duct 22 (at least one of the intake air duct 21 and the exhaust air duct 22). In this case, for example, one of the broken blowers 35 may be removed, and the duct with fans 40 may be connected to the duct (the intake air duct 21 or the exhaust air duct 22) on the side of the removed blower 35. In addition, the in-duct fans 45 of the multiple ducts with fans 40, 40 have different maximum air volumes, but the present invention is not limited thereto, and the same maximum air volumes may be used.

[0063] (6) The ventilation system 20 is configured to be provided in the attic 13 above the ceiling wall 14 as a wall between the room 12 and the outside, but is not limited to this. For example, the wall between the room and the outside may be a floor or an intermediate wall between each floor. In other words, the ventilation system may be installed under the floor or on an intermediate wall between each floor (between two walls). (7) Although the fan-equipped duct 40 is configured to be supported by the support member 47, the present invention is not limited to this and may be configured, for example, to be placed on the ceiling 13. In addition, an air conditioning system such as a heating and cooling system may be added to the ventilation system 20.

[0064] (8) In the event that the blower 35 breaks down, the blower 35 is removed and the blower-equipped duct 40 is connected. However, this is not limited to the above, and the blower 35 that is operating normally may be removed and the blower-equipped duct 40 may be connected. (9) Although the blower-equipped duct 40 is connected to the downstream side of the heat exchanger 30 in the above embodiment, the present invention is not limited to this. [Explanation of symbols]

[0065] 10: Building 11: Indoors 12: Indoor 13: Attic 14: Ceiling / Wall 16: Intake 17: Outlet 18: Intake port 19: Air outlet 20: Ventilation system 21: Air supply duct 22: Exhaust duct 21A, 21B (22A, 22B): Bent section 25: Filter Box 25A: Partition plate 30: Heat exchanger 31: Heat exchange element 32: Case 33: Storage unit 33A: Bottom part 33B: Siege Wall 33C: Fastening 33D: Wire passage 33E: Connector part 33F: Through hole 34A, 34B: Duct connection 35: Blower 36: Side 36A: Cylindrical part 37: Cover part 37A, 37B: Plate-shaped part 37C: Circular section 37D, 37E: Through holes 38: Metal Plate 39: Lid 40: Duct with blower 41: Duct section 42: Main body 43,49: Duct connection 44: Terminal case 45: Ducted fan 47: Support member 47A: 1st suspension part 47B: Support rod 47C: 2nd hanging part 48: Fastened part 50: Binding material 53: Sealing member 55: Removal part 57: Inspection hatch 60A, 60B: Operation switch 61: Controller BT1,BT2: Screws BA1: Ventilation system BA2: Heat exchanger BT1, BT2, BT3: Screws OA, EA, RA, SA: Air T1: Terminal TB: Texxvis TL: Tools W,W1,W2: Electric wire

Claims

1. A ventilation system comprising: an air supply duct that introduces outdoor air into a room; an exhaust duct that exhausts the air in the room to the outside; and a heat exchanger that exchanges heat between the air in the air supply duct and the air in the exhaust duct, The heat exchanger includes a case and a heat exchange element housed in the case, and also includes a removal section in which a blower in the heat exchanger is removed, A cross-sectional area of ​​a portion having the removable portion in the space within the heat exchanger is different from a cross-sectional area of ​​the intake air duct and a cross-sectional area of ​​the exhaust air duct, a duct with a blower, the duct including a duct portion and an in-duct blower that blows air in the duct portion, is connected to each of the intake air duct and the exhaust air duct; A ventilation system, wherein the duct fan of the duct with fan connected to the air supply duct has a maximum air volume larger than that of the duct fan of the duct with fan connected to the exhaust duct.

2. A ventilation system comprising: an air supply duct that introduces outdoor air into a room; an exhaust duct that exhausts the air in the room to the outside; and a heat exchanger that exchanges heat between the air in the air supply duct and the air in the exhaust duct, The heat exchanger includes a case and a heat exchange element housed in the case, and also includes a removal section in which a blower in the heat exchanger is removed, A cross-sectional area of ​​a portion having the removable portion in the space within the heat exchanger is different from a cross-sectional area of ​​the intake air duct and a cross-sectional area of ​​the exhaust air duct, a duct with a blower, the duct including a duct portion and an in-duct blower that blows air in the duct portion, is connected to each of the intake air duct and the exhaust air duct; The device is provided with an operation switch capable of adjusting the air volume of each of the plurality of blower-equipped ducts. Ventilation system.

3. An inspection hatch is provided in the wall between the indoor and outdoor areas, 3. The ventilation system according to claim 1, wherein the inspection hatch has a size that is large enough to prevent the heat exchanger from passing through and large enough to allow the blower-equipped duct to pass through.

4. a support member that supports the fan-equipped duct in a suspended state relative to a building at a position where the fan-equipped duct does not contact a wall between the indoor and outdoor areas, 3. The ventilation system according to claim 1, wherein at least one of the air supply duct and the air exhaust duct is connected to the blower-equipped duct in a bent state so as to detour around a route.

5. A method for manufacturing a ventilation system including an air supply duct that introduces outdoor air into a room, an exhaust duct that exhausts air from the room to the outside, and a heat exchanger that includes a case and a heat exchange element housed in the case and exchanges heat between air in the air supply duct and air in the exhaust duct, comprising: a removal process of removing a blower attached to the case; a connecting step of connecting a duct with a blower, the duct including a duct portion and an in-duct blower for blowing air in the duct portion, to at least one of the air supply duct and the exhaust duct; A method for manufacturing a ventilation system, wherein the cross-sectional area of ​​a portion of the space within the heat exchanger having a removal portion where the blower is removed is different from the cross-sectional area of ​​the intake air duct and the cross-sectional area of ​​the exhaust air duct.

6. The blower before the removal step is connected to a controller and an operation switch for controlling the blower via an electric wire, In the removing step, the electric wire is cut and the blower attached to the case is removed, The method for manufacturing a ventilation system according to claim 5, wherein the electric wire connected to the operation switch is connected to the in-duct fan in the duct with a fan.

7. The removing step is to remove a screw for fixing the blower, The method for manufacturing a ventilation system according to claim 5 or 6, further comprising a sealing step of attaching a sealing member to the case so as to cover an area including the screw.

8. The blower is driven by an AC motor, The method for manufacturing a ventilation system according to claim 5 or 6, wherein the duct fan is driven by a DC motor.

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