ventilation equipment

Abstract

To provide a ventilation device which enables an air supply flow passage and an air exhaust flow passage to be easily formed and thereby improving assembling performance thereof.SOLUTION: A ventilation device comprises: a rectangular heat transfer element which performs heat exchange between an air supply flow distributed from an outdoor space to an indoor space and an air exhaust flow distributed from the indoor space to the outdoor space and has four side face; an outdoor side block which has an OA duct for sucking the air supply flow and an EA duct for discharging the air exhaust flow; an indoor side exhaust block which has an SA duct to discharge the air supply flow and an RA duct to suck the air exhaust flow; an upstream side exhaust block which has an upstream side exhaust wind passage communicating the RA duct with the heat transfer element; a downstream side exhaust block which has a downstream side exhaust wind passage communicating the EA duct with the heat transfer element; and a body case which defines arrangement of four blocks and the heat transfer element in an interior space.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to ventilation devices. [Background technology]

[0002] Patent Document 1 discloses a ventilation device that ensures increased ventilation air volume and improved heat exchange efficiency while also being easy to install and maintain. This ventilation device has an air supply path that takes outdoor air into a building and an exhaust path that exhausts air from inside the building to the outdoors. The ventilation device's element unit has an element that performs at least heat exchange between air flowing through the air supply path and the exhaust path. The ventilation device's fan unit has an air supply fan that blows air from the air supply path that has undergone heat exchange in the element into the building via an air supply port, and an exhaust fan that exhausts air from the exhaust path that has undergone heat exchange in the element to the outdoors via an exhaust port. The ventilation device has a connecting means that detachably connects the element unit and the fan unit. The side of the element unit is provided with an element attachment / detachment port through which at least the element can be attached and detached, and an element attachment / detachment cover that can open and close the element attachment / detachment port. The side of the fan unit is provided with a fan attachment / detachment port through which at least the air supply fan and the exhaust fan can be attached and detached, and a fan attachment / detachment cover that can open and close the fan attachment / detachment port. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-020522 Summary of the Invention [Problem to be solved by the invention]

[0004] It is preferable to be able to easily form an intake air duct and an exhaust air duct in order to improve the assembly ease of a ventilation device. The technology disclosed in Patent Document 1 requires a process of separately assembling an element unit and a fan unit and a process of connecting the element unit and the fan unit using a connecting means to form the intake air duct and the exhaust air duct. Therefore, the technology disclosed in Patent Document 1 requires various processes to form the intake air duct and the exhaust air duct, and there is room for improvement in the assembly ease of a ventilation device.

[0005] One object of the present disclosure is to provide a ventilation device that can be easily assembled by making it possible to easily form an air supply passage and an exhaust passage. [Means for solving the problem]

[0006] The ventilation device of the present disclosure comprises a rectangular heat exchange element having four sides that exchanges heat between an intake air flow circulating from outdoors to indoors and an exhaust air flow circulating from indoors to outdoors, an outdoor block having an OA duct that draws in the intake air flow and an EA duct that blows out the exhaust air flow, an indoor block having an SA duct that blows out the intake air flow and an RA duct that draws in the exhaust air flow, an upstream exhaust block having an upstream exhaust air duct that connects the RA duct to the heat exchange element, a downstream exhaust block having a downstream exhaust air duct that connects the EA duct to the heat exchange element, and a main body case that defines the arrangement of the four blocks and the heat exchange element in the internal space. The main body case is arranged so that the indoor block faces the first side of the rectangle of the heat exchange element, the outdoor block faces the third side opposite the first side, the upstream exhaust block faces the fourth side adjacent to the first and third sides and one end and the other end of the upstream exhaust block are connected to the outdoor block and the indoor block, and the downstream exhaust block faces the second side adjacent to the first and third sides and one end and the other end of the downstream exhaust block are connected to the outdoor block and the indoor block, thereby positioning the heat exchange element in the element storage section formed by being surrounded by the four blocks. [Effects of the Invention]

[0007] In the ventilation device of the present disclosure, the intake air passage and the exhaust air passage can be easily formed by storing the four blocks and the heat exchange element in the internal space of the main body case, thereby improving the assembly efficiency of the ventilation device. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing the configuration of the ventilation device according to the first embodiment. [Figure 2] FIG. 2 is a plan view schematically showing the configuration of the ventilation device according to the first embodiment. [Figure 3] FIG. 3 is a perspective view showing a part of a procedure for storing four blocks in the main body case in the first embodiment. [Figure 4] FIG. 4 is a perspective view showing a part of a procedure for storing a heat exchange element in an element storage section defined by four blocks in the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments will be described in detail with reference to the drawings. However, unnecessary detailed description may be omitted. For example, detailed description of well-known matters or redundant description of substantially the same configuration may be omitted. This is to avoid unnecessary redundancy in the following description and to facilitate understanding by those skilled in the art.

[0010] The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0011] (Embodiment 1) Hereinafter, the first embodiment will be described with reference to FIGS.

[0012] [1-1.Configuration] The ventilation device 1 ventilates the indoor space and exchanges heat between the thermal energy contained in the air (intake air flow AF1) supplied from the outdoors to the indoors and the thermal energy contained in the air (exhaust air flow AF2) exhausted from the indoors to the outdoors.

[0013] 1 to 3, the ventilation device 1 includes a main body case 10, an outdoor block 20, an indoor block 30, an upstream exhaust block 40, a downstream exhaust block 50, an element storage section 90, a heat exchange element 60, an intake centrifugal blower 70, and an exhaust centrifugal blower 80.

[0014] The main body case 10 is a rectangular housing formed by combining multiple sheet metal members and has an internal space, and has a first case side surface 11, a second case side surface 12, a third case side surface 13, and a fourth case side surface 14. The main body case 10 defines and contains the outdoor block 20, the indoor block 30, the upstream exhaust block 40, the downstream exhaust block 50, and the heat exchange element 60 in the internal space.

[0015] The first case side surface 11 is a flat plate-shaped component adjacent to the second case side surface 12 and the fourth case side surface, and abuts against the indoor block 30. The first case side surface 11 is formed by processing sheet metal, and has a case opening 10a.

[0016] The case opening 10a is a hole for allowing an OA duct 21, an EA duct 22, an SA duct 31, and an RA duct 32, which will be described later, to pass through the main body case 10.

[0017] The second case side surface 12 is a flat plate-shaped component adjacent to the first case side surface 11 and the third case side surface 13, and abuts against the outdoor block 20, the indoor block 30, and the downstream exhaust block 50. The second case side surface 12 is formed by processing sheet metal.

[0018] The third case side surface 13 is a flat plate-shaped part adjacent to the second case side surface 12 and the fourth case side surface 14, and abuts against the outdoor block 20. The third case side surface 13 is formed by processing sheet metal, and has a case opening 10a.

[0019] The fourth case side surface 14 is a flat plate-shaped part adjacent to the first case side surface 11 and the third case side surface 13, and abuts against the outdoor block 20, the indoor block 30, and the upstream exhaust block 40. The fourth case side surface 14 is formed by processing sheet metal.

[0020] The outdoor block 20 is a rectangular member formed by processing polystyrene foam, and is disposed in the internal space of the main body case 10, and abuts against the second case side surface 12, the third case side surface 13, and the fourth case side surface 14. The outdoor block 20 is disposed opposite the indoor block 30, with the heat exchange element 60 sandwiched between them. The outdoor block 20 has an OA duct 21 and an EA duct 22.

[0021] OA duct 21 forms part of an intake air passage through which intake airflow AF1 flows, and draws intake airflow AF1 into main body case 10. OA duct 21 penetrates main body case 10 via case opening 10a, and a part of it is exposed to the outside of main body case 10. OA stands for outside air.

[0022] The EA duct 22 forms part of an exhaust air passage through which the exhaust flow AF2 flows, and blows the exhaust flow AF2 out of the main body case 10. The EA duct 22 penetrates the main body case 10 via a case opening 10a, and a part of it is exposed to the outside of the main body case 10. EA stands for Exhaust Air.

[0023] The indoor block 30 is a rectangular member formed by processing polystyrene foam, and is disposed in the internal space of the main body case 10, and abuts against the first case side surface 11, the second case side surface 12, and the fourth case side surface 14. The indoor block 30 is disposed opposite the outdoor block 20, with the heat exchange element 60 sandwiched between them. The indoor block 30 has an SA duct 31 and an RA duct 32.

[0024] SA duct 31 forms part of the supply air passage and blows out supply airflow AF1 from main body case 10. SA duct 31 penetrates main body case 10 via case opening 10a, and a part of it is exposed to the outside of main body case 10. SA stands for Supply Air.

[0025] The RA duct 32 forms part of the exhaust air passage and draws the exhaust flow AF2 into the main body case 10. The RA duct 32 penetrates the main body case 10 through the case opening 10a, and a part of it is exposed to the outside of the main body case 10. RA stands for return air.

[0026] The upstream exhaust block 40 is a rectangular member formed by processing polystyrene foam, and is disposed in the internal space of the main body case 10. One end of the upstream exhaust block 40 is connected to the outdoor block 20, and the other end is connected to the indoor block 30. The side surfaces of the upstream exhaust block 40 adjacent to one end and the other end abut against the fourth case side surface 14. The upstream exhaust block 40 is disposed between the outdoor block 20 and the indoor block 30, and is disposed opposite the downstream exhaust block 50 with the heat exchange element 60 sandwiched between them. The upstream exhaust block 40 has an upstream exhaust air passage 41.

[0027] The upstream exhaust airflow duct 41 forms a part of the exhaust airflow duct, and connects the RA duct 32 with the heat exchange element 60. The upstream exhaust airflow duct 41 is disposed upstream of the heat exchange element 60 in the exhaust airflow duct, and passes the exhaust airflow AF2 through it before exchanging heat with the intake airflow AF1.

[0028] The downstream exhaust block 50 is a rectangular member formed by processing polystyrene foam, and is disposed in the internal space of the main body case 10. One end of the downstream exhaust block 50 is connected to the outdoor block 20, and the other end is connected to the indoor block 30. The side surfaces of the downstream exhaust block 50 adjacent to one end and the other end abut against the second case side surface 12. The downstream exhaust block 50 is disposed opposite the upstream exhaust block 40, with the heat exchange element 60 sandwiched between them. The downstream exhaust block 50 has a downstream exhaust air passage 51.

[0029] The downstream exhaust airflow passage 51 forms a part of the exhaust airflow passage, and connects the EA duct 22 with the heat exchange element 60. The downstream exhaust airflow passage 51 is disposed downstream of the heat exchange element 60 in the exhaust airflow passage, and passes the exhaust airflow AF2 that has exchanged heat with the intake airflow AF1.

[0030] The outdoor block 20, the indoor block 30, the upstream exhaust block 40, and the downstream exhaust block 50 are provided as independent members.

[0031] The center-to-center distance between the OA duct 21 and the EA duct 22 is different from the center-to-center distance between the SA duct 31 and the RA duct 32. In the first embodiment, the center-to-center distance between the OA duct 21 and the EA duct 22 is shorter than the center-to-center distance between the SA duct 31 and the RA duct 32.

[0032] The element storage section 90 is a rectangular space formed (defined) by storing four blocks (outdoor block 20, indoor block 30, upstream exhaust block 40, and downstream exhaust block 50) in the internal space of the main body case 10, and stores the heat exchange element 60. The element storage section 90 has a packing 91.

[0033] The packing 91 abuts against at least one of the outdoor block 20, the indoor block 30, the upstream exhaust block 40, and the downstream exhaust block 50, and against the heat exchange element 60 stored in the element storage section 90. The packing 91 is arranged in the outdoor block 20, the indoor block 30, the upstream exhaust block 40, and the downstream exhaust block 50. The packing 91 preferably abuts against each of the outdoor block 20, the indoor block 30, the upstream exhaust block 40, and the downstream exhaust block 50. When the packing 91 abuts against the heat exchange element 60, it is preferable that the packing 91 abuts against the outer peripheral edges of all four sides of the heat exchange element 60, over the entire circumference. Because the packing 91 is pressed by the heat exchange element 60 when the heat exchange element 60 is stored in the element storage section 90, it is preferable to select a material with a low friction coefficient.

[0034] The heat exchange element 60 is a rectangular hexahedron that is stored in the element storage unit 90 to form part of the intake air passage and the exhaust air passage, and exchanges heat between the thermal energy contained in the intake airflow AF1 and the thermal energy contained in the exhaust airflow AF2. The heat exchange element 60 is formed by stacking multiple heat transfer plates at predetermined intervals, and the intake airflow AF1 and the exhaust airflow AF2 flow alternately layer by layer. The heat exchange element 60 has a first side surface 61, a second side surface 62, a third side surface 63, a fourth side surface 64, and a handle 65.

[0035] The first side surface 61 is a surface facing the third side surface 63 that forms the heat exchange element 60, has an intake airflow outlet opening 61a that blows out the intake airflow AF1, and faces the outdoor block 20.

[0036] The second side surface 62 is a surface facing the fourth side surface 64 that forms the heat exchange element 60, has an exhaust flow outlet opening 62a that blows out the exhaust flow AF2, and faces the downstream exhaust block 50.

[0037] The third side surface 63 is a surface facing the first side surface 61 that forms the heat exchange element 60, has an intake air flow suction opening 63a that draws in the intake air flow AF1, and faces the indoor block 30.

[0038] The fourth side surface 64 is a surface that faces the second side surface 62 that forms the heat exchange element 60, has an exhaust flow suction opening 64a that draws in the exhaust flow AF2, and faces the upstream exhaust block 40.

[0039] The handle 65 is a part that is held when the heat exchange element 60 is transported.

[0040] The intake air centrifugal blower 70 is disposed in the indoor block 30 and generates an intake air flow AF1. The intake air centrifugal blower 70 has an intake air sirocco fan 71, an intake air casing 72, and an intake air motor 73.

[0041] The intake sirocco fan 71 is a centrifugal impeller for pressurizing the air.

[0042] The air intake casing 72 houses the air intake sirocco fan 71 and has an air intake opening 72a.

[0043] The intake air opening 72a is a circular opening that draws in the intake airflow AF1, and is disposed opposite the first side surface 61 that has the intake airflow outlet opening 61a.

[0044] Air supply motor 73 rotatably supports air supply sirocco fan 71 via first shaft 73a. With heat exchange element 60 removed, air supply motor 73 is detachably mounted on indoor block 30 via element housing 90. In other words, by arranging components such as the rotor and stator, excluding first shaft 73a, upstream of air supply opening 72a, air supply motor 73 can be easily attached to and detached from indoor block 30 via element housing 90.

[0045] The first shaft 73a extends upright from the air supply motor 73 toward the downstream side of the air supply flow AF1.

[0046] The exhaust centrifugal blower 80 is disposed in the downstream exhaust block 50 and generates an exhaust flow AF2. The exhaust centrifugal blower 80 has an exhaust sirocco fan 81, an exhaust casing 82, and an exhaust motor 83.

[0047] The exhaust sirocco fan 81 is a centrifugal impeller for increasing the pressure of the air.

[0048] The exhaust casing 82 houses the exhaust sirocco fan 81 and has an exhaust opening 82a.

[0049] The exhaust opening 82a is a circular opening that draws in the exhaust flow AF2, and is disposed opposite the second side surface 62 that has the exhaust flow outlet opening 62a.

[0050] The exhaust motor 83 rotatably supports the exhaust sirocco fan 81 via the second shaft 83a. With the heat exchange element 60 removed, the exhaust motor 83 is detachably mounted to the downstream exhaust block 50 via the element housing portion 90. In other words, by arranging components such as the rotor and stator excluding the second shaft 83a upstream of the exhaust opening 82a, the exhaust motor 83 can be easily attached to and detached from the downstream exhaust block 50 via the element housing portion 90.

[0051] The second shaft 83a stands upright from the exhaust motor 83 toward the downstream side of the exhaust flow AF2.

[0052] [1-2. Assembly] A part of the assembly of the ventilation device 1 configured as above will be explained with reference to FIGS.

[0053] In FIG. 3, dashed arrows indicate how four blocks (outdoor block 20, indoor block 30, upstream exhaust block 40, and downstream exhaust block 50) are stored in the main body case 10. The outdoor block 20 is stored in the main body case 10 by inserting the OA duct 21 and the EA duct 22 into the case opening 10a from the interior space side of the main body case 10. The indoor block 30 is stored in the main body case 10 by inserting the SA duct 31 and the RA duct 32 into the case opening 10a from the interior space side of the main body case. The upstream exhaust block 40 is stored in the interior space of the main body case 10 that stores the outdoor block 20 and the indoor block 30, thereby connecting the outdoor block 20 and the indoor block 30. The downstream exhaust block 50 is stored in the interior space of the main body case 10 that stores the outdoor block 20, the indoor block 30, and the upstream exhaust block 40, thereby connecting the outdoor block 20 and the indoor block 30. When the four blocks are stored in the internal space of the main body case 10, a rectangular space that serves as the element storage section 90 is defined (formed).

[0054] 4 shows with dashed arrows how the heat exchange element 60 is stored in the element storage section 90 defined by four blocks. The heat exchange element 60 is stored (inserted) into the element storage section 90 (the hatched area in FIG. 4) while being gripped by the handle 65. When the heat exchange element 60 is stored in the element storage section 90, the packing 91 is pressed by the heat exchange element 60. As soon as the storage of the heat exchange element 60 in the element storage section 90 is completed, an intake air passage from the OA duct 21 to the SA duct 31 and an exhaust air passage from the RA duct 32 to the EA duct 22 are formed.

[0055] [1-3. Effects, etc.] As described above, the intake air passage and the exhaust air passage are formed by storing the four blocks in the internal space of the main body case 10 and storing the heat exchange element 60 in the element storage section 90 defined by storing the four blocks. In other words, the ventilation device 1 does not require any work steps or parts for connecting the four blocks, and it is possible to form the intake air passage and the exhaust air passage simply by storing the four blocks and the heat exchange element 60 in the rectangular internal space of the main body case 10. Therefore, the ventilation device 1 can be easily assembled.

[0056] Furthermore, air supply motor 73 is detachably disposed in indoor block 30 so that components such as the rotor and stator, excluding first shaft 73a, are located upstream of air supply opening 72a. In other words, a worker replacing air supply motor 73 can easily replace air supply motor 73 via element housing 90 by removing heat exchange element 60 from element housing 90. This improves the maintainability of ventilation device 1.

[0057] Furthermore, the exhaust motor 83 is detachably disposed in the downstream exhaust block 50 so that components such as the rotor and stator, excluding the second shaft 83a, are located upstream of the exhaust opening 82a. In other words, a worker replacing the exhaust motor 83 can easily replace the exhaust motor 83 via the element storage unit 90 by removing the heat exchange element 60 from the element storage unit 90.

[0058] Furthermore, in the ventilation device 1, the first side surface 61 and the intake opening 72a are arranged opposite each other. That is, the opening surfaces face each other, so that the flow direction of the intake airflow AF1 from the intake airflow outlet opening 61a to the intake opening 72a can be prevented from changing. As a result, the ventilation device 1 can reduce pressure loss in the intake airflow path between the heat exchange element 60 and the intake air centrifugal blower 70.

[0059] Furthermore, the ventilation device 1 is disposed so that the second side surface 62 and the exhaust opening 82a face each other. That is, the opening surfaces face each other, so that the flow direction of the exhaust flow AF2 from the exhaust flow outlet opening 62a to the exhaust opening 82a is prevented from changing. This reduces pressure loss in the exhaust air passage between the heat exchange element 60 and the exhaust centrifugal fan 80.

[0060] The packing 91 improves the airtightness between the four blocks and the heat exchange elements, and reduces the amount of the intake airflow AF1 and the exhaust airflow AF2 leaking into areas other than those intended by the design. Therefore, the ventilation device 1 can improve the air blowing efficiency and heat exchange efficiency compared to when the packing 91 is not provided.

[0061] Furthermore, by providing a difference between the center distance between the OA duct 21 and the EA duct 22 and the center distance between the SA duct 31 and the RA duct 32, it becomes possible to easily identify the position where the outdoor block 20 is stored in the internal space of the main body case 10 and the position where the indoor block 30 is stored in the internal space of the main body case 10. Therefore, the ventilation device 1 can be easily assembled.

[0062] (Other embodiments) As described above, the first and second embodiments have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to these and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made.

[0063] Therefore, other embodiments will be exemplified below.

[0064] In embodiment 1, it was explained that the outdoor block 20 is stored in the internal space of the main body case 10, and then the indoor block 30 is stored in the main body case 10. However, it is also possible to store the indoor block 30 in the internal space of the main body case 10, and then store the outdoor block 20 in the internal space of the main body case 10.

[0065] In embodiment 1, it was explained that the upstream exhaust block 40 is stored in the internal space of the main body case 10, and then the downstream exhaust block 50 is placed in the internal space of the main body case 10. However, it is also possible to place the downstream exhaust block 50 in the internal space of the main body case 10, and then place the upstream exhaust block 40 in the internal space of the main body case 10.

[0066] In embodiment 1, the center-to-center distance between OA duct 21 and EA duct 22 is shorter than the center-to-center distance between SA duct 31 and RA duct 32, but the center-to-center distance between OA duct 21 and EA duct 22 may be longer than the center-to-center distance between SA duct 31 and RA duct 32.

[0067] (Summary of the Invention) An overview of the ventilation device 1 in the present disclosure will be described below.

[0068] The ventilation device 1 exchanges heat between an intake airflow AF1 flowing from the outdoors to the indoors and an exhaust airflow AF2 flowing from the indoors to the outdoors, and includes a rectangular heat exchange element 60 having four sides (a first side 61, a second side 62, a third side 63, and a fourth side 64), an outdoor block 20 having an OA duct 21 that draws in the intake airflow AF1 and an EA duct 22 that blows out the exhaust airflow AF2, an SA duct 31 that blows out the intake airflow AF1, and an RA duct 32 that draws in the exhaust airflow AF2. an indoor block 30 having an RA duct 32 and an upstream exhaust block 40 having an upstream exhaust air passage 41 connecting the RA duct 32 and the heat exchange element 60; a downstream exhaust block 50 having a downstream exhaust air passage 51 connecting the EA duct 22 and the heat exchange element 60; and a main body case 10 that defines the arrangement of the four blocks (the outdoor block 20, the indoor block 30, the upstream exhaust block 40, and the downstream exhaust block 50) and the heat exchange element 60 in the internal space. The main body case 10 is arranged so that the indoor block 30 faces the rectangular first side 61 of the heat exchange element 60, the outdoor block 20 faces the third side 63 facing the first side 61, the upstream exhaust block 40 faces the fourth side 64 adjacent to the first side 61 and the third side 63, and one end and the other end of the upstream exhaust block 40 are connected to the outdoor block 20 and the indoor block 30, and the downstream exhaust block 50 faces the second side 62 adjacent to the first side 61 and the third side 63, and one end and the other end of the downstream exhaust block 50 are connected to the outdoor block 20 and the indoor block 30, thereby positioning the heat exchange element 60 in the element storage section 90 formed by being surrounded by the four blocks.

[0069] Ventilation device 1 includes intake centrifugal blower 70, which has intake motor 73 that rotates intake sirocco fan 71 via first shaft 73a and intake casing 72 that houses intake sirocco fan 71 and generates intake flow AF1, and exhaust centrifugal blower 80, which has exhaust motor 83 that rotates exhaust sirocco fan 81 via second shaft 83a and exhaust casing 82 that houses exhaust sirocco fan 81 and generates exhaust flow AF2. Air intake motor 73 and exhaust motor 83 are arranged so as to be removable via element storage section 90.

[0070] The first shaft 73a and the second shaft 83a are erected toward the downstream side from the air supply motor 73 and the exhaust motor 83, respectively.

[0071] Heat exchange element 60 has an intake airflow outlet opening 61a on first side surface 61 through which intake airflow AF1 is blown out, and an exhaust airflow outlet opening 62a on second side surface 62 through which exhaust airflow AF2 is blown out. In intake casing 72, intake opening 72a that draws in intake airflow AF1 is arranged opposite intake airflow outlet opening 61a. In exhaust casing 82, exhaust opening 82a that draws in exhaust airflow AF2 is arranged opposite exhaust airflow outlet opening 62a.

[0072] The ventilation device (1) includes packings that contact at least one of the outdoor block (20), the indoor block (30), the upstream exhaust block (40), and the downstream exhaust block (50) and the heat exchange element (60) stored in the element storage section (90).

[0073] In the ventilation device 1, a difference is provided between the center distance between the OA duct 21 and the EA duct 22 and the center distance between the SA duct 31 and the RA duct 32. [Industrial Applicability]

[0074] The present disclosure is applicable to ventilation devices in which the formation of an air supply path and an air exhaust path can be complicated during assembly. [Explanation of symbols]

[0075] 1. Ventilation system 10 Main unit case 10a Case opening 11 First case side 12 Second case side 13 Third case side 14 Fourth case side 20 Outdoor Block 21 OA duct 22 EA duct 30 Indoor block 31 SA Duct 32 RA duct 40 Upstream exhaust block 41 Upstream exhaust air duct 50 Downstream exhaust block 51 Downstream exhaust air duct 60 Heat exchange element 61 First aspect 61a Intake air outlet opening 62 Second aspect 62a Exhaust flow outlet opening 63 Third aspect 63a Intake air flow opening 64 Fourth aspect 64a Exhaust flow intake opening 65 Toride 70 Centrifugal air intake fan 71 Intake Sirocco Fan 72 Air intake casing 72a Air intake opening 73 Air supply motor 73a First shaft 80 Exhaust centrifugal blower 81 Exhaust Sirocco Fan 82 Exhaust casing 82a Exhaust opening 83 Exhaust motor 83a Second shaft 90 Element Storage Unit 91 Gasket AF1 Intake Air Flow AF2 Exhaust Flow

Claims

1. a rectangular heat exchange element having four sides, which exchanges heat between an intake air flow circulating from the outdoors to the indoors and an exhaust air flow circulating from the indoors to the outdoors; an outdoor block having an OA duct that draws in the intake air flow and an EA duct that blows out the exhaust air flow; an indoor block having an SA duct that blows out the intake air flow and an RA duct that sucks in the exhaust air flow; an upstream exhaust block having an upstream exhaust air passage that connects the RA duct and the heat exchange element; a downstream exhaust block having a downstream exhaust air passage that connects the EA duct and the heat exchange element; a main body case defining an internal space in which the four blocks and the heat exchange elements are disposed; The main body case includes: The indoor block is disposed to face a first side surface of the rectangular heat exchange element, The outdoor block is disposed facing a third side surface facing the first side surface, the upstream-side exhaust block is disposed so as to face a fourth side surface adjacent to the first side surface and the third side surface, and one end and the other end of the upstream-side exhaust block are connected to the outdoor-side block and the indoor-side block, A ventilation device in which the downstream exhaust block is opposed to the second side surface adjacent to the first side surface and the third side surface, and one end and the other end of the downstream exhaust block are connected to the outdoor block and the indoor block, thereby positioning the heat exchange element in an element storage section formed by being surrounded by the four blocks.

2. an intake air centrifugal blower that generates the intake air flow, the intake air centrifugal blower having an intake motor that rotates an intake air sirocco fan via a first shaft and an intake air casing that houses the intake air sirocco fan; an exhaust centrifugal blower that has an exhaust motor that rotates an exhaust sirocco fan via a second shaft and an exhaust casing that houses the exhaust sirocco fan and generates the exhaust flow, The air supply motor and the exhaust motor are The ventilation device according to claim 1 , wherein the ventilation device is arranged so as to be removable through the element storage section.

3. The first shaft and the second shaft 3. The ventilation system according to claim 2, wherein the air supply motor and the exhaust motor are provided in an upright position facing downstream from each other.

4. The heat exchange element is an intake air flow outlet opening on the first side surface that blows out the intake air flow; an exhaust flow outlet opening on the second side surface through which the exhaust flow is blown out, The air intake casing includes: an intake air opening for sucking in the intake air flow is disposed opposite the intake air flow outlet opening, The exhaust casing includes: The ventilation device according to claim 2 , wherein an exhaust opening for sucking the exhaust flow is disposed opposite the exhaust flow outlet opening.

5. 2. The ventilation device according to claim 1, further comprising a gasket that abuts against at least one of the outdoor block, the indoor block, the upstream exhaust block, and the downstream exhaust block and the heat exchange element stored in the element storage section.

6. 2. The ventilation device according to claim 1, wherein a difference is provided between a center distance between the OA duct and the EA duct and a center distance between the SA duct and the RA duct.

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