Ventilator, air conditioner, ventilation structure, shield member and connector set

Abstract

To provide a connector set for connecting a stationary plate and a movable plate of a shield member.SOLUTION: Four connectors 70 each have a ball support part 710 having a ball part at a tip via a connection end part formed with a thickness smaller than the diameter of the ball part, and a synthetic resin ball receiving part 720 having a grip part that detachably grips the ball part at a tip. The grip part comprises a pad part having a semi-spherical inner face, and a plurality of pressing parts protruding from the peripheral edge of the pad part and brought into elastic contact with a semi-spherical portion on the opposite side of a semi-spherical portion that is abutted on the pad part on the surface of the ball part. The plurality of pressing parts is provided around a center axis G1 of the grip part. Gaps 725E, in which the connection end part of the ball support part can be put in the state of connecting the ball support part and the ball receiving part, are formed between the respective pressing parts in a first direction D1 orthogonal to the center axis and in a second direction D2 orthogonal to the center axis G1 and the first direction D1, from the center axis.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present invention relates to a ventilation device, an air conditioner, a ventilation structure, a shielding member, and a connector set. [Background technology]

[0002] A conventional ventilation device 200 shown in Fig. 26 is provided with a heat exchanger for exchanging heat between the outside air and the indoor air, an exhaust fan, and an intake fan in a main body 210 installed in a space S21 above the ceiling using a hanging bracket or the like. A lower opening 211 is formed in the case of the main body 210, and an air intake port, a filter housing section, and the like are exposed downward through the lower opening 211. A shielding member 220 is attached to the main body 210 to shield the lower opening 211 of the main body 210 from the indoors.

[0003] The shielding member 220 includes a ceiling penetration part 221 that passes through an opening 310 in the ceiling 300, and a cover 222 that covers the opening at the lower end of the ceiling penetration part 221. An exhaust fan (not shown) provided in the main body 210 causes indoor air in the living space S22 below the ceiling 300 to flow into the shielding member 220 through a gap between the cover 222 and the ceiling penetration part 221, and is then sent to the main body 210. The air is then exhausted to the outdoors via an exhaust duct 230 connected to the main body 210.

[0004] Patent Document 1 discloses a ventilation device in which a main body connected to a duct is placed in the space above the ceiling, and indoor air is drawn in through a lower opening on the main body that opens onto the indoor side and leads to the duct, and then exhausted to the outdoors.

[0005] In addition, in the ventilation device 200 shown in FIG. 26, the cover 222 is provided so as to be freely opened and closed by a hinge 223, and as shown by the dashed line in FIG. 26, the cover 222 can be opened to clean the inside of the shielding member 220. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 11-281119 Summary of the Invention [Problem to be solved by the invention]

[0007] The ducts are arranged and the ventilation device 200 is installed in the space S21 above the ceiling based on the plan for supplying and exhausting air to each room. However, since the axis for opening and closing the cover 222 is predetermined at a specific position of the ventilation device 200, when the cover 222 is opened, the interval w between the cover 222 and the wall 400 of the room or the corridor may become narrow. In this way, if the interval w between the cover 222 and the wall 400 is narrow even when the cover 222 is opened, it is not easy to perform maintenance of the ventilation device 200, such as cleaning the inside of the shielding member 220. This problem is not limited to heat exchange type ventilation devices that suck in indoor air from the lower space, but may also occur when the ventilation vent of a ventilation device fixed to a building is shielded by a plate material and this plate material is moved around an axis provided at a specific position. Furthermore, the same applies when the air conditioning vent of an air conditioner fixed to a building is shielded by a plate material or when the vent of the building is shielded by a plate material.

[0008] Therefore, an object of the present invention is to provide a ventilation device, an air conditioner, a ventilation structure, a shielding member, and a connector set. [Means for solving the problem]

[0009] The ventilation device of the present invention is a ventilation device comprising: a main body portion that is disposed in a space above the ceiling and to which a duct is connected; and a shielding member that shields a lower opening for ventilation of the main body portion facing downward, the shielding member comprising a fixed plate formed in an annular shape with an opening disposed below the lower opening, a movable plate, and a connector that connects the fixed plate and the movable plate, the movable plate having a pair of first edges that extend in an x-axis direction in which the x coordinate increases along an x-axis perpendicular to a z-axis in which the z coordinate increases as one moves upward from the opening of the fixed plate, and a pair of second edges that extend in a y-axis direction in which the y coordinate increases along a y-axis perpendicular to the z-axis and the x-axis, the outline of which is formed in a right-angled quadrilateral, the connectors being respectively disposed between corners of the movable plate and corner opposing portions of the fixed plate that are opposed to the corners, and the connectors being disposed between the corner opposing portions of the fixed plate and the movable plate. and a ball support portion protruding from one of the opposing surfaces of the corner of the fixed plate and having a ball portion at its tip, and a ball receiving portion made of synthetic resin protruding from the corner opposing portion of the fixed plate and the other opposing surface of the corner of the movable plate and having a gripping portion at its tip for detachably gripping the ball portion, wherein when the four connectors connect the ball support portion and the ball receiving portion, the movable plate is positioned at a distance from the fixed plate in the opposite direction of the z axis along which the z coordinate becomes smaller, so that the lower opening is shielded, and when the movable plate is moved from a state in which the lower opening is shielded by the movable plate to expose the lower opening, two of the four connectors aligned in the x-axis direction or the y-axis direction maintain a state in which the ball support portion and the ball receiving portion are connected to form an axis that is the center of movement of the movable plate, and furthermore, four of the axes are provided selectably.

[0010] When exposing the lower opening from a state in which the lower opening is covered, the connection state of the two connectors aligned in the x-axis or y-axis direction can be released, and the connection state of the remaining connector can be maintained to move the movable plate. This is because, when the two connectors in the connected state are aligned in the x-axis direction, their ball parts are also aligned in the x-axis direction, and one of the ball support parts and ball receiver parts of the two connectors in the connected state, which is provided on the movable plate, can be moved with the imaginary line connecting the ball parts as the center (axis) of movement. When the two connectors in the connected state are aligned in the y-axis direction, their ball parts are also aligned in the y-axis direction, and the movable plate can move with the imaginary line connecting the ball parts as the center (axis) of movement. In the present invention, when opening the movable plate to expose the lower opening, two of the four connectors are arranged in the x-axis direction and two in the y-axis direction as combinations of two connectors that support the movable plate in a connected state, i.e., there are four different ways of opening. When opening the movable plate, any of the four ways of opening can be selected to expose the lower opening.

[0011] In the ventilation device of the present invention, the gripping portion comprises a pad portion having a hemispherical inner surface, and a plurality of retaining portions protruding from the periphery of the pad portion and elastically contacting a hemispherical portion on the surface of the ball portion that is on the opposite side to the hemispherical portion that abuts against the pad portion.

[0012] The multiple pressing parts form the ball entrance. The multiple pressing parts, which have elasticity, deform to expand the ball entrance, and then return to their original positions after expansion, allowing the ball part to be inserted and removed. This allows the ball support part and the ball receiving part to be releasably connected, and also allows the ball part to be maintained in a state in which it is inserted in the grip part.

[0013] In the ventilation device of the present invention, preferably, when the movable plate is in a state where the lower opening is blocked, the gripping portion has a plurality of the pressing portions provided around a central axis of the gripping portion extending in the z-axis direction, and of the four connectors, the coordinates of one projected onto the xy plane are in a first quadrant, the coordinates of one projected onto the xy plane are in a second quadrant, the coordinates of one projected onto the xy plane are in a third quadrant, and the coordinates of one projected onto the xy plane are in a fourth quadrant, the connector having a coordinate in the first quadrant has a first gap formed between the pressing portions in the x-axis direction from the central axis and a second gap formed between the pressing portions in the y-axis direction from the central axis, the connector having a coordinate in the second quadrant has a first gap formed between the pressing portions in the x-axis opposite direction from the central axis and a second gap formed between the pressing portions in the y-axis direction from the central axis, and the connector having a coordinate in the third quadrant has a first gap formed between the pressing portions in the x-axis opposite direction from the central axis and a second gap formed between the pressing portions in the y-axis direction from the central axis. the connecting device having coordinates in the fourth quadrant has a first gap formed between the holding portions in the x-axis direction opposite from the central axis and a second gap formed between the holding portions in the y-axis direction opposite from the central axis, the ball support portion is formed thinner than the ball portion and has a connection end portion connected to the ball portion, and when the lower opening is exposed, if the two connecting devices that maintain the ball support portion and the ball receiving portion in a connected state are lined up in the x-axis direction, the connection end portion of the ball support portion is inserted into the second gap, and when the two connecting devices that maintain the ball support portion and the ball receiving portion in a connected state are lined up in the y-axis direction, the connection end portion of the ball support portion is inserted into the first gap.

[0014] In the two connectors in the connected state when the movable plate is moved, a first gap and a second gap are provided in the direction in which the connection end moves relative to the gripping part, with the imaginary line connecting the ball parts as the center (axis). When the two connectors in the connected state are aligned in the y-axis direction, the first gap is arranged in a direction perpendicular to the imaginary line connecting the ball parts. When the two connectors in the connected state are aligned in the x-axis direction, the second gap is arranged in a direction perpendicular to the imaginary line connecting the ball parts.

[0015] When the gripping portion grips the ball portion and the ball support portion and the ball receiving portion are connected, the position of the connection end can be changed from the ball entrance / exit position to the second gap by inserting the connection end into the first gap, or the position of the connection end can be changed from the ball entrance / exit position to the second gap by inserting the connection end into the second gap, thereby greatly changing the angle formed between the ball support portion and the ball receiving portion, centered on the ball portion. This allows the movable plate to change its angle significantly around an imaginary line connecting the ball portions, from a position that blocks the lower opening to a position that exposes the lower opening. The material of the ball support portion is not limited, but may be, for example, a synthetic resin such as ABS resin, or a metal such as an aluminum alloy.

[0016] The present invention relates to an air conditioner provided with a lower opening facing a room below a ceiling, the air conditioner comprising a shielding member for shielding the lower opening, the shielding member comprising a fixed plate formed in an annular shape with an opening disposed below the lower opening, a movable plate, and a connector for connecting the fixed plate and the movable plate, the movable plate having a pair of first edges extending in an x-axis direction in which the x coordinate increases along an x-axis perpendicular to a z-axis in which the z coordinate increases going upward from the opening of the fixed plate, and a pair of second edges extending in a y-axis direction in which the y coordinate increases along a y-axis perpendicular to the z-axis and the x-axis, the connectors being disposed between corners of the movable plate and corner opposing portions of the fixed plate opposing the corners, the connectors being disposed between the corner opposing portions of the fixed plate and the corner opposing portions of the movable plate ... and a ball support part having a ball portion at its tip, and a ball receiving part made of synthetic resin protruding from the corner opposing part of the fixed plate and the other opposing surface of the corner of the movable plate and having a gripping part at its tip for detachably gripping the ball portion, wherein when the four connecting devices connect the ball support part and the ball receiving part, the movable plate is positioned at a distance from the fixed plate in the opposite direction of the z axis along which the z coordinate becomes smaller, so that the lower opening is shielded, and when the movable plate is moved from a state in which the lower opening is shielded by the movable plate to expose the lower opening, two of the four connecting devices lined up in the x-axis direction or the y-axis direction maintain the state in which the ball support part and the ball receiving part are connected to form an axis that is the center of movement of the movable plate, and furthermore, four of the axes are provided to be selectable.

[0017] The present invention relates to a ventilation structure for ventilation between a floor forming a flow path and a room adjacent to the floor with a ceiling as a boundary, the ventilation structure comprising a shielding member for shielding a vent hole formed in the ceiling, the shielding member comprising a fixed plate formed in an annular shape with an opening disposed below the vent hole, a movable plate, and a connector for connecting the fixed plate and the movable plate, the movable plate having a pair of first edges extending in an x-axis direction in which the x coordinate increases along an x-axis perpendicular to a z-axis in which the z coordinate increases as one moves upward from the opening of the fixed plate, and a pair of second edges extending in a y-axis direction in which the y coordinate increases along a y-axis perpendicular to the z-axis and the x-axis, the outline of the movable plate being formed in a rectangular quadrilateral shape, the connectors being respectively disposed between corners of the movable plate and corner opposing portions of the fixed plate opposing the corners, and the connectors being further disposed between the corner opposing portions of the fixed plate and the corner opposing portions of the movable plate. and a ball support part made of synthetic resin protruding from one of the opposing surfaces of the corner opposing portion of the fixed plate and the corner of the movable plate and having a gripping part at its tip for detachably gripping the ball part, wherein when the four connectors connect the ball support part and the ball receiving part, the movable plate is positioned at a distance from the fixed plate in the opposite direction of the z axis along which the z coordinate becomes smaller, so that the vent hole is blocked, and when the movable plate is moved from a state in which the vent hole is blocked by the movable plate to expose the vent hole, two of the four connectors aligned in the x-axis direction or the y-axis direction maintain a state in which the ball support part and the ball receiving part are connected to each other and form an axis that is the center of movement of the movable plate, and furthermore, four selectable axes are provided.

[0018] The present invention relates to a shielding member for shielding a ventilation or air conditioning vent of a building, or a vent of a ventilation device or air conditioner fixed to the building, comprising: a fixed plate formed in an annular shape with an opening leading to the vent, a movable plate, and a connector connecting the fixed plate and the movable plate, the movable plate having a pair of first edges extending in an x-axis direction in which the x coordinate increases along an x-axis perpendicular to a z-axis in which the z coordinate increases from the opening to the vent side of the fixed plate, and a pair of second edges extending in a y-axis direction in which the y coordinate increases along a y-axis perpendicular to the z-axis and the x-axis, the connectors being disposed between corners of the movable plate and corner opposing portions of the fixed plate opposing the corners, and the connectors being connected to one opposing surface of the corner opposing portion of the fixed plate and the corner opposing portion of the movable plate. and a ball support part made of synthetic resin protruding from the corner opposing part of the fixed plate and the other opposing surface of the corner of the movable plate and having a gripping part at its tip for detachably gripping the ball part, wherein when the four connectors connect the ball support part and the ball receiving part, the movable plate is positioned at a distance from the fixed plate in the opposite direction of the z axis along which the z coordinate becomes smaller, so that the ventilation hole is blocked, and when the movable plate is moved from a state in which the ventilation hole is blocked by the movable plate to expose the ventilation hole, two of the four connectors aligned in the x-axis direction or the y-axis direction maintain the state in which the ball support part and the ball receiving part are connected to form an axis that is the center of movement of the movable plate, and furthermore, four selectable axes are provided.

[0019] The present invention relates to a connector set comprising four connectors for connecting a fixed plate formed in an annular shape with a movable plate having a rectangular outline that covers a ventilation opening of the fixed plate, and for respectively arranging the connectors between the corners of the movable plate and the opposing corners of the fixed plate that face the corners, and for forming four axes that are the centers of the movement of the movable plate and are made up of virtual lines connecting ball portions together, parallel to the outline, when the opening of the fixed plate is exposed. The connectors are for attachment to one of the fixed plate and the movable plate, and comprise a ball support portion having the ball portion at its tip via a connection end formed to be smaller in thickness than the diameter of the ball portion, and for attachment to the other of the fixed plate and the movable plate, and the ball support portion is provided with a connecting end that is formed to be smaller in thickness than the diameter of the ball portion. and a ball receiving portion made of synthetic resin and having a gripping portion at its tip for detachably gripping the ball support portion, wherein the gripping portion comprises a pad portion having a hemispherical inner surface, and a plurality of pressing portions protruding from the periphery of the pad portion and elastically contacting a hemispherical portion on the surface of the ball portion opposite the hemispherical portion abutting the pad portion, wherein the plurality of pressing portions are provided surrounding a central axis of the gripping portion, and when the ball support portion and the ball receiving portion are connected, gaps into which the connection end of the ball support portion can be inserted are formed between the pressing portions in a first direction perpendicular to the central axis and a second direction perpendicular to the central axis and the first direction, respectively, from the central axis. By providing four of these connectors on the shielding member, unlike conventional shielding members, the movable plate can be opened in a direction that makes it easier to perform maintenance on the ventilation device, etc., depending on the usage environment.

[0020] Furthermore, in the connector set of the present invention, the ball receiving portion preferably comprises a second base fixed to the fixed plate or the movable plate, a second extension portion extending vertically from the second base, the gripping portion provided at the tip of the second extension portion, and a second reinforcing portion extending vertically from the second base portion, and the second reinforcing portion extends via a side surface of the second extension portion to a side surface of one of the holding portions positioned between the two gaps. The second reinforcing portion reinforces the one pressing portion disposed between the two gaps, thereby preventing deformation and the like. Effect of the Invention

[0021] According to the shielding member of the present invention, the movable plate can be opened in a manner selected from four different ways, and therefore a large space can be secured when the movable plate is opened, making it easier to perform maintenance work such as cleaning the ventilation device. Furthermore, by connecting the fixed plate and the movable plate with the connector of the present invention, a shielding member that can be opened in four different ways can be formed. [Brief description of the drawings]

[0022] [Figure 1] 1 is a cross-sectional view of a heat exchange type ventilation device according to a first embodiment of the present invention. [Diagram 2] 2 is a perspective view of a shielding member of the heat exchange type ventilation device of FIG. 1. [Diagram 3] FIG. 3 is a plan view of the shielding member of FIG. 2. [Figure 4] 3 is a plan view of a ceiling insertion portion and a fixing plate of the shielding member of FIG. 2. [Diagram 5] 3 is a plan view of a movable plate of the shielding member of FIG. 2. [Figure 6] 3 is a front view showing a first connector in a state in which the ball support portion and the ball receiving portion of the shielding member in FIG. 2 are connected to each other. FIG. [Figure 7] 7A is a perspective view of the ball support part in FIG. 6, (b) is a left side view of the ball support part, and (c) is a front view of the ball support part. [Figure 8] 7A is a perspective view of the ball receiving portion in FIG. 6, and FIG. 7B is a plan view of the ball receiving portion. [Figure 9] 8(a) is a cross-sectional view of the first connector taken along line A1-A1 in FIG. 6, and (b) is an end view of the ball receiving portion taken along line A2-A2 in FIG. 8(b). [Figure 10](a) is a plan view showing the ball receiving portion of the first connector and the corner of the movable plate, (b) is a plan view showing the ball receiving portion of the second connector and the corner of the movable plate, (c) is a plan view showing the ball receiving portion of the third connector and the corner of the movable plate, and (d) is a plan view showing the ball receiving portion of the fourth connector and the corner of the movable plate. [Figure 11] FIG. 2 is a perspective view of a connector set used in manufacturing the heat exchanger ventilator according to the first embodiment of the present invention. [Figure 12] 1A is a diagram showing the movable plate and fixed plate in a closed state, and the second connector and third connector on one of the second edges, and FIG. 1B is a diagram showing the movable plate and fixed plate in an open state using the first opening method, and the second connector and third connector on one of the second edges. [Figure 13] FIG. 13 is a cross-sectional view taken along line A3-A3 in FIG. [Figure 14] 11 is a perspective view showing the shielding member with the movable plate in an open state by the first opening method. FIG. [Figure 15] 13 is a perspective view showing the shielding member with the movable plate in an open state by the second opening method. FIG. [Figure 16] 1A is a diagram showing the movable plate and fixed plate in a closed state and the first and second connectors on one side of the first edge, and FIG. 1B is a diagram showing the movable plate and fixed plate in an open state using the third opening method and the first and second connectors on one side of the first edge. [Figure 17] FIG. 16(b) is a cross-sectional view taken along line A4-A4 of FIG. [Figure 18] 13 is a perspective view showing the shielding member with the movable plate in an open state by a third opening method. FIG. [Figure 19] FIG. 11 is a perspective view showing the shielding member with the movable plate in an open state by a fourth opening method. [Figure 20] 3(a) and 3(b) are diagrams illustrating the operation of the heat exchange type ventilation device according to the first embodiment of the present invention. [Figure 21] FIG. 4 is a cross-sectional view of a modified example of the heat exchange type ventilation device according to the first embodiment of the present invention. [Figure 22] FIG. 6(a) is a perspective view of a ventilation device according to a second embodiment of the present invention, and FIG. 6(b) is a cross-sectional view of the ventilation device of (a). [Figure 23] FIG. 10(a) is a perspective view of an air conditioner according to a third embodiment of the present invention, and (b) is a cross-sectional view of the air conditioner of (a). [Figure 24] FIG. 11 is a cross-sectional view of a ventilation structure according to a fourth embodiment of the present invention. [Diagram 25] 11A and 11B are cross-sectional views for explaining another example of use of the shielding member. [Figure 26] FIG. 1 is a diagram for explaining a conventional ventilation device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0024] [First embodiment] The heat exchange type ventilation device 1 shown in Figure 1 comprises a main body 10 that is placed in the space S11 above the ceiling and performs heat exchange, a duct connection part 20 for connecting a duct to the main body 10, and a shielding member 30 that shields the lower opening for ventilation of the main body 10 facing downward.

[0025] In the following description, the shielding member 30 will be described with the origin of the xyz coordinates located at the center of the opening 500 of the fixing plate 50 described later in the state shown in Figs. 1 to 3 in which the lower opening 111 of the main body 10 is shielded by the shielding member 30. The z coordinate is set in a direction in which the z coordinate increases as it penetrates the opening 500 and goes up from the opening 500. The direction in which the x coordinate increases along the x axis is referred to as the x-axis direction, the direction in which the y coordinate increases along the y axis is referred to as the y-axis direction, and the direction in which the z coordinate increases along the z axis is referred to as the z-axis direction. In the heat exchange type ventilation device 1, the central axis G2 of the shielding member 30 is set coaxially with the z axis, and these extend vertically. The reverse direction of the x axis direction is referred to as the x-axis reverse direction, the reverse direction of the y axis direction is referred to as the y-axis reverse direction, and the reverse direction of the z axis direction is referred to as the z-axis reverse direction.

[0026] (Main body 10) Although the cross-sectional structure of the main body 10 is not shown in the drawings, the case contains an intake air flow path through which outside air flows, an exhaust air flow path through which indoor air flows, a heat exchanger that exchanges heat between the outside air and the indoor air, and an exhaust air blower and an intake air blower such as a centrifugal fan. The heat exchanger is a laminate consisting of alternately stacked exhaust sheets having paths through which exhaust indoor air flows and air supply sheets having paths through which intake outside air flows, and is positioned within the main body, for example at the point where the exhaust flow path and the intake flow path intersect.

[0027] The main body 10 is provided in the middle of an air supply duct that sends outside air from an intake port provided on an exterior wall to an air supply port provided on the ceiling of a living room, etc., and is also provided in the middle of an exhaust duct that sends indoor air from an exhaust port provided on the ceiling of a bathroom, etc. to an exhaust port provided on an exterior wall. For example, the main body 10 is placed in a space S11 above the ceiling of a hallway. The case of the main body 10 has a lower opening 111 in the panel forming the lower surface, and a part of the components accommodated in the case is exposed through this lower opening 111. This exposed part is formed as a recess 112.

[0028] (Filter device) The main body 10 also includes a filter device 15 that collects foreign matter such as dust and dirt contained in the outside air sent from the outdoors to the indoors. For example, filter device 15 includes a filter and a housing portion that is provided in main body 10 and houses the filter. The housing portion has an inlet / outlet for the filter in recess 112 exposed through lower opening 111 of the case of main body 10, and when the filter is housed in the housing portion, the inlet / outlet is closed with a lid. The filter is made of a frame with a fibrous material that collects dust and dirt. For example, if the filter becomes dirty, the lid can be removed, the used filter can be taken out of the storage section, and it can be replaced with a new filter. Incidentally, recess 112 exposed through lower opening 111 of the case is provided with suction port 113 through which indoor air from living space S12 below ceiling 300 flows into main body 10, and suction port filter 16 for trapping foreign matter contained in the air flowing into suction port 113 may be detachably provided in recess 112. This suction port filter 16 is also configured by stretching a fiber material that traps dust and dirt, for example, over a frame, and can be removed for replacement or cleaning.

[0029] (Duct connection part 20) The duct connection part 20 is formed into a tapered tube, and ducts that connect to an outside air intake port, an air supply port, and an indoor air exhaust port and exhaust port are connected to the duct connection part 20. In Fig. 1, there is no distinction between the air supply system and the exhaust system, and the ducts are given the reference numeral 91.

[0030] (Shielding member 30) The shielding member 30 comprises a ceiling insertion portion 40 which penetrates from a lower end portion 41 to an upper end portion 42, with the upper end portion 42 fixed to the main body portion 10 and passed through an opening 310 in the ceiling 300, a fixed plate 50 formed in a ring shape whose inner peripheral edge is connected to the lower end portion 41 of the ceiling insertion portion 40, a movable plate 60, and four connectors 70 which connect the fixed plate 50 and the movable plate 60.

[0031] The ceiling insertion portion 40 has a horizontal cross section formed in a square or rectangular shape. Moreover, ceiling insertion part 40 has an attachment part 44 on its inner circumferential surface having a hole for passing a screw, and a body-side attachment part that fits with this attachment part 44 is provided in recess 112 of main body part 10, and with upper end part 42 passing through lower opening 111 and entering recess 112, ceiling insertion part 40 is attached to main body part 10 by fixing attachment part 44 to the body-side attachment part of main body part 10 with a screw. By fixing shielding member 30 to main body part 10, opening 500 formed by the inner circumferential edge of fixing plate 50 is connected to lower opening 111 and suction port 113 of main body part 10. As shown in FIG. 4, the fixed plate 50 has a contour shape in a right-angled quadrilateral when viewed from above. The ceiling insertion portion 40 and the fixed plate 50 may be made of, but are not limited to, a synthetic resin such as ABS resin, and may be molded as a single unit, or the fixed plate having an opening 500 that allows indoor air to pass through and the cylindrical ceiling insertion portion may be molded separately and then joined together.

[0032] (movable plate 60) As shown in Fig. 5, the movable plate 60 has a rectangular contour shape in plan view, similar to the fixed plate 50. The material of the movable plate 60 is not limited, but it is made of a synthetic resin such as ABS resin. Furthermore, the movable plate 60 includes a third reinforcing portion 65 protruding from the surface facing the fixed plate 50. The third reinforcing portion 65 includes a pair of first protruding portions 651 extending in the x-axis direction, a pair of second protruding portions 652 extending in the y-axis direction, and a connection portion 653 where the first protruding portions 651 and the second protruding portions 652 are connected to form a protruding corner toward the corner portion 61 of the movable plate 60, and is formed in a right-angled quadrilateral shape in a plan view of the surface facing the fixed plate 50. Note that the third reinforcing portion 65 is omitted in FIG. 1 and in FIGS. 6, 9, 10, 12, 13, 16, 17, 20, and 21 described later.

[0033] The fixed plate 50 and the movable plate 60 each have four corners 51, 61, and the dimensions of the four sides are set to be approximately the same. As will be described in more detail below, the movable plate 60 is positioned by the four connectors 70 such that the corners 61 of the movable plate 60 are positioned below the corners 51 of the fixed plate 50, as shown in Figures 1 and 2, thereby blocking the opening 500 of the fixed plate 50, the lower opening 111 of the main body 10, and the recess 112.

[0034] The fixed plate 50 and the movable plate 60 have a pair of first edges 50A, 60A extending parallel to each other, and a pair of second edges 50B, 60B extending parallel to each other and turning 90 degrees from the first edges 50A, 60A. Furthermore, when the fixed plate 50 is positioned below and parallel to the movable plate 60 to cover the opening 500 of the fixed plate 50, etc. (hereinafter referred to as the closed state), the first edges 50A, 60A extend in the x-axis direction, and the second edges 50B, 60B extend in the y-axis direction.

[0035] The fixed plate 50 and the movable plate 60 are each formed with a pair of first edges 50A, 60A and a pair of second edges 50B, 60B into a square outline, and the dimensions of each of the first edges 50A, 60A and the second edges 50B, 60B are, for example, 450 mm to 600 mm. Note that instead of a square, they may be formed into a rectangular shape.

[0036] Furthermore, corner portion 51 of fixed plate 50 is a point where first edge 50A and second edge 50B of fixed plate 50 are connected to form a corner, and further has a first opposing surface 50C facing movable plate 60, and this first opposing surface 50C has a size a1 mm inward from first edge 50A and a2 mm inward from second edge 50B, where a1 and a2 are, for example, 30 mm to 50 mm.

[0037] The corner 61 of the movable plate 60 is also the point where the first edge 60A and the second edge 60B of the movable plate 60 are connected to form a corner, and further has a second opposing surface 60C facing the fixed plate 50, and this second opposing surface 60C has a size that is b1 mm inward from the first edge 60A and b2 mm inward from the second edge 60B, where b1 and b2 are, for example, 30 mm to 50 mm.

[0038] The corners 51 of the fixed plate 50 and the corners 61 of the movable plate 60 are not limited to those in which the first edges 50A, 60A and the second edges 50B, 60B are directly connected, and the connected portions may be formed as arc-shaped edges, notched edges, etc. In this case, too, it is preferable to set the dimensions of the arc-shaped edges, notched edges, etc. smaller than the dimensions of the first edges 50A, 60A and the second edges 50B, 60B, and form the fixed plate 50 and the movable plate 60 into a right-angled quadrilateral.

[0039] (Connector 70) The connectors 70 are respectively disposed between the four corners 51 of the fixed plate 50 and the four corners 61 of the movable plate 60. In Fig. 3, which shows a plan view of the shielding member 30 in the closed state, a portion of each of the four connectors 70 is shown in perspective with dashed lines, and a portion visible through the opening 500 of the fixed plate 50 is shown with solid lines, and the four connectors 70 are disposed at a distance from each other in the x-axis direction and the y-axis direction.

[0040] Hereinafter, in the plan view of the shielding member 30 as shown in Fig. 3, the connector 70 arranged in the first quadrant indicated by the arrow α1 as a projection position on the xy plane is referred to as the first connector 70A, and the remaining three connectors 70 arranged in counterclockwise order from the first connector 70A are referred to as the second connector 70B, the connector 70 arranged in the third quadrant as the third connector 70C, and the connector 70 arranged in the fourth quadrant as the fourth connector 70D. Note that when describing a connector without targeting a specific connector (first connector 70A, second connector 70B, third connector 70C, fourth connector 70D), they are simply referred to as connectors 70. Furthermore, of the four corners 61 of the movable plate 60, the one where the first connector 70A is positioned is referred to as corner 61A, the one where the second connector 70B is positioned is referred to as corner 61B, the one where the third connector 70C is positioned is referred to as corner 61C, and the one where the fourth connector 70D is positioned is referred to as corner 61D.

[0041] First, the first connector 70A will be described. As shown in Figure 6, the first connector 70A has a ball support portion 710 protruding from a first opposing surface 50C facing the movable plate 60 at the corner 51 of the fixed plate 50, and a ball receiving portion 720 protruding from a second opposing surface 60C facing the fixed plate 50 at the corner 61A of the movable plate 60.

[0042] As shown in Figure 7(a), the ball support portion 710 includes a plate-shaped first base portion 711 attached to the first opposing surface 50C of the fixed plate 50, a first extension portion 712 extending vertically from the first base portion 711, a spherical ball portion 713 formed at the tip of the first extension portion 712, and a first reinforcing portion 714 protruding from the first base portion 711 and connected to the side surface of the first extension portion 712 (side surface 712B excluding the connection end portion 712A described below) and supporting the first extension portion 712. The ball support portion 710 is made of synthetic resin, and the first base portion 711, the first extending portion 712, the ball portion 713, and the first reinforcing portion 714 are integrally molded. As shown in Figures 7(b) and (c), ball portion 713 has a spherical surface 713A formed at a certain radius r1 from center C, but ball portion 713 has an outer shape in which a part of a sphere is missing, and a recess 713C is formed that is recessed inward from this notch 713B. This recess 713C allows ball portion 713 to be molded into a spherical shape. In Figure 7(c), center C is represented by a ●. Ball portion 713 constitutes the tip of ball support portion 710 via connection end 712A of first extending portion 712, and connection end 712A of first extending portion 712 is formed thin with a thickness t1 set smaller than the diameter of the ball of ball portion 713. In the illustrated example, first extending portion 712 is formed in a rod shape including connection end 712A, but the shape of first extending portion 712 is not limited thereto and may be any shape as long as it has connection end 712A formed thinner than ball portion 713.

[0043] As shown in Figures 8(a) and (b), the ball receiving portion 720 comprises a plate-shaped second base portion 721 attached to the second opposing surface 60C of the movable plate 60, a second extension portion 722 extending vertically from the second base portion 721, a gripping portion 723 formed at the tip of the second extension portion 722 for detachably gripping the ball portion 713, and a second reinforcing portion 724 protruding from the second base portion 721 and connected to the side surface 722A of the second extension portion 722 to support the second extension portion 722. The ball receiving portion 720 is made of synthetic resin, and the second base portion 721, the second extending portion 722, the gripping portion 723, and the second reinforcing portion 724 are integrally formed.

[0044] As shown in Figures 9(a) and (b), the gripping portion 723 includes a pad portion 723A having a hemispherical inner surface 727A, and a plurality of pressing portions 723B protruding from the periphery of the pad portion 723A and elastically contacting a hemispherical portion of the surface 713A of the ball portion 713 opposite the hemispherical portion in contact with the pad portion 723A. The pressing portion 723B has a spherical surface forming portion 723C connected to the pad portion 723A and having an inner surface 727B along the surface of a virtual sphere, and a tip portion 723D formed on the opposite side of the pad portion 723A of the spherical surface forming portion 723C. The inner surfaces 727A and 727B of the gripping portion 723 form a ball receiving surface 727 that abuts against the surface 713A of the ball portion 713. The ball receiving surface 727 (inner surfaces 727A and 727B) are each formed along the surface of a virtual sphere of radius r1, and the center of the virtual sphere coincides with the center C of the ball portion 713 when the ball portion 713 is gripped by the gripping portion 723, and the center C of the ball portion 713 is represented by ● in Figures 9(a) and (b). In terms of thickness (dimension) in a direction perpendicular to the central axis G1 described later, the tip portion 723D is formed thicker than the spherical surface forming portion 723C. Each pressing portion 723B constitutes the tip of the ball receiving portion 720, and also constitutes a ball entrance 723E for inserting and removing the ball portion 713, as described below.

[0045] As shown in FIG. 8, the gripping portion 723 is provided with four pressing portions 723B, and if a virtual line perpendicular to the second opposing surface 60C of the corner 61A of the attachment destination and passing through the center C of the spherical inner surface of the gripping portion 723 is defined as a central axis G1 of the gripping portion 723, the four pressing portions 723B are arranged in a circumferential direction so as to surround the central axis G1. When the four pressing portions 723B are arranged in the circumferential direction around the central axis G1, gaps are formed between the pressing portions 723B. Here, the gaps will be described in detail. When the ball receiving portion 720 of the first connector 70A in Fig. 10(a) is viewed from the gripping portion 723 side (plan view), the first gap 725A, the second gap 725B, the third gap 725C, and the fourth gap 725D are arranged at intervals of 90 degrees around the central axis G1 of the gripping portion 723. The first gap 725A and the third gap 725C are arranged in the x-axis direction with the central axis G1 between them, and the second gap 725B and the fourth gap 725D are arranged in the y-axis direction with the central axis G1 between them. In Fig. 10, the central axis G1 is represented by ●.

[0046] 10(a), the first gap 725A is disposed in the x-axis direction from the central axis G1 of the gripping portion 723 toward the second edge 60B constituting the corner portion 61A where the ball receiving portion 720 of the first connector 70A is provided. In FIG. 10, the x-axis direction is indicated by an arrow with the symbol d11. 10(a), the second gap 725B is disposed in the y-axis direction from the central axis G1 of the gripping portion 723 toward the first edge 60A constituting the corner portion 61A where the ball receiving portion 720 of the first connector 70A is provided. In FIG. 10, the y-axis direction is indicated by an arrow with the symbol d21.

[0047] In this way, in the gripping portion 723 of the ball receiving portion 720, there are gaps (first gap 725A, second gap 725B, third gap 725C, fourth gap 725D) between the pressing portions 723B, and therefore each pressing portion 723B can widen the space W70 between the opposing tip ends 723D with their central axes G1 disposed therebetween, thereby inserting and removing the ball portion 713. When the gripping portion 723 is not gripping the ball portion 713, the space W70 between the tip ends 723D of each pressing portion 723B is set to be smaller than the diameter of the ball portion 713 (W70<2r1).

[0048] In order to hold the ball portion 713 of the ball support portion 710 by the holding portion 723 of the ball receiving portion 720 from a state in which the ball portion 713 is not held by the holding portion 723 of the ball receiving portion 720, the ball portion 713 can be pushed into the holding portion 723 by inserting the ball portion 713 into the ball entrance 723E of the holding portion 723 and widening the interval W70 between the tip portions 723D of the holding portions 723B. In addition, since the holding portions 723B have elasticity, when the ball portion 713 is inserted into the holding portion 723, the holding portions 723B return to their original position. In this way, when the ball portion 713 is inserted into the holding portion 723, the hemispherical portion of the ball portion 713 opposite to the hemispherical portion of the ball portion 713 that abuts against the inner surface of the pad portion 723A is held by the multiple holding portions 723B, and the ball portion 713 is held. This maintains the connected state between the ball support portion 710 and the ball receiving portion 720. In Fig. 9(b), the ball portion 713 inserted into the gripping portion 723 and its connection end portion 712A are indicated by dashed lines, and when the movable plate 60 is in the closed state, the connection end portion 712A is disposed in the ball entrance / exit 723E.

[0049] 8(b), the ball receiving portion 720 provided on the movable plate 60 further includes an abutment portion 726 that abuts against the first protruding portion 651 and the second protruding portion 652 that constitute the connection portion 653 of the third reinforcing portion 65. The abutment portion 726 forms an inside corner with a first abutment portion 726A that abuts against the first protruding portion 651 of the connection portion 653 of the third reinforcing portion 65, and a second abutment portion 726B that abuts against the second protruding portion 652 of the connection portion 653 of the third reinforcing portion 65. The ball receiving portion 720 can be positioned by abutting the abutment portion 726 against the connection portion 653 of the third reinforcing portion 65 so that the outside corner of the third reinforcing portion 65 fits into this inside corner. The abutting portion 726 and the second extending portion 722 extend perpendicularly from the second base portion 721 , and are connected to each other via one of the three second reinforcing portions 724 .

[0050] Furthermore, in the gripping portion 723 of the ball receiving portion 720, a pressing portion 723B marked with the symbol α2 in Fig. 8(a) is disposed between the first gap 725A and the second gap 725B. Among the three second reinforcing portions 724, the second reinforcing portion 724A marked with the symbol α3 is formed from the second base portion 721, through the side surface 722A of the second extending portion 722, across the side surface α21 of the pressing portion α2 so as to reinforce the pressing portion α2. In the illustrated example, the second reinforcing portion 724A extends to the tip end portion 723D of the pressing portion α2 and supports the pressing portion α2 from the outside together with the second extending portion 722. The second reinforcing portion 724A prevents deformation of the pressing portion α2 and the like.

[0051] Also, as shown in Fig. 8(b), the width W11 of the first gap 725A and the width W12 of the second gap 725B are formed wider than the width W13 of the third gap 725C and the width W14 of the fourth gap 725D. Specifically, the width W11 of the first gap 725A and the width W12 of the second gap 725B are set to be larger than the thickness t1 of the connecting end portion 712A of the ball support portion 710 (t1 < W11, t1 < W12). The first gap 725A and the second gap 725B are configured to be able to accommodate the connecting end portion 712A of the ball support portion 710. In contrast, the third gap 725C and the fourth gap 725D cannot accommodate the connecting end portion 712A of the ball support portion 710 (W13 < t1, W14 < t1).

[0052] (Second coupler 70B, third coupler 70C, and fourth coupler 70D) The second coupler 70B, the third coupler 70C, and the fourth coupler 70D each include a ball support portion 710 and a ball receiving portion 720, similar to the first coupler 70A.

[0053] (Second coupler 70B) The first coupler 70A and the second coupler 70B disposed on one side of the first edges 50A, 60A are arranged symmetrically with respect to the yz plane of x = 0 that longitudinally cuts through the central axis G2 of the shielding member 30, and are also formed symmetrically. In Fig. 3, the central axis G2 of the shielding member 30 is represented by ●. As shown in the plan view of the ball receiving portion 720 and corner portion 61B of the second connector 70B in Fig. 10(b), in the ball receiving portion 720 of the second connector 70B, the first gap 725A is disposed in the reverse x-axis direction from the central axis G1 of the gripping portion 723 toward the second edge 60B constituting the corner portion 61B where the ball receiving portion 720 of the second connector 70B is provided. In Fig. 10, the reverse x-axis direction is indicated by an arrow with the symbol d12. Furthermore, as shown in FIG. 10(b), in the ball receiving portion 720 of the second connector 70B, the second gap 725B is disposed in the y-axis direction (d21) from the central axis G1 of the gripping portion 723 toward the first edge 60A constituting the corner portion 61B at which the ball receiving portion 720 of the second connector 70B is provided.

[0054] (Third connector 70C) The second connector 70B and the third connector 70C, which are arranged on one side of the second edges 50B, 60B, are arranged and formed symmetrically with respect to the xz plane of y=0 which passes through the central axis G2 of the shielding member 30. As shown in the plan view of the ball receiving portion 720 and corner 61C of the third connector 70C in Figure 10(c), in the ball receiving portion 720 of the third connector 70C, the first gap 725A is positioned in the reverse x-axis direction (d12) from the central axis G1 of the gripping portion 723 toward the second edge 60B that constitutes the corner 61C on which the ball receiving portion 720 of the third connector 70C is provided. 10(c), in the ball receiving portion 720 of the third connector 70C, the second gap 725B is disposed in the reverse y-axis direction from the central axis G1 of the gripping portion 723 toward the first edge 60A constituting the corner 61C where the ball receiving portion 720 of the third connector 70C is provided. In FIG. 10, the reverse y-axis direction is indicated by an arrow with the symbol d22.

[0055] (Fourth connector 70D) The first connector 70A and the fourth connector 70D, which are arranged on the other side of the second edges 50B, 60B, are arranged and formed symmetrically with respect to the xz plane of y=0 which passes through the central axis G2 of the shielding member 30. As shown in the plan view of the ball receiving portion 720 and corner 61D of the fourth connector 70D in Figure 10(d), in the ball receiving portion 720 of the fourth connector 70D, the first gap 725A is positioned in the x-axis direction (d11) from the central axis G1 of the gripping portion 723 toward the second edge 60B that constitutes the corner 61D on which the ball receiving portion 720 of the fourth connector 70D is provided. Furthermore, as shown in FIG. 10(d), in the ball receiving portion 720 of the fourth connector 70D, the second gap 725B is arranged in the reverse y-axis direction (d22) from the central axis G1 of the gripping portion 723 toward the first edge 60A that constitutes the corner 61D at which the ball receiving portion 720 of the fourth connector 70D is provided.

[0056] (movable plate closed) As a result of the first connector 70A, the second connector 70B, the third connector 70C and the fourth connector 70D each connecting the ball support portion 710 and the ball receiving portion 720, the movable plate 60 is held in a position below the fixed plate 50, as shown in Figures 1 and 2, and the lower opening 111 and recess 112 of the main body portion 10 are blocked by the movable plate 60 positioned below and are not exposed to the room. In this manner, with the movable plate 60 in the closed state, the heat exchange type ventilation device 1 draws indoor air through the gap 55 between the movable plate 60 and the fixed plate 50 using the exhaust fan provided in the main body 10, and exhausts the air from the main body 10 to the outdoors through the exhaust duct.

[0057] In addition, in the closed state of the movable plate 60, as shown in FIGS. 6 and 9, the fixed plate 50 and the movable plate 60 are arranged at a distance in the z-axis direction, and the interval W56 between them is maintained, for example, at 30 mm to 50 mm. The interval W56 is the dimension in the z-axis direction from the first opposing surface 50C to the second opposing surface 60C. In the connector 70, the dimension (height) H1 by which the ball support portion 710 protrudes from the first opposing surface 50C is set to be larger than the dimension (height) H2 by which the ball receiving portion 720 protrudes from the second opposing surface 60C. Further, the center C of the ball portion 713 of the ball support portion 710 is arranged below and shifted to the side of the second opposing surface 60C from the middle between the first opposing surface 50C and the second opposing surface 60C in the z-axis direction. Specifically, the dimension (distance) Hc in the z-axis direction from the first opposing surface 50C to the center C of the ball portion 713 is set to be larger than the dimension obtained by halving the interval W56. Also, as shown in FIG. 6, when the first connector 70A is viewed in the y-axis direction from the fourth connector 70D, the dimension b3 in the x-axis direction from the center C of the ball portion 713 of the movable plate 60 to the second edge 60B is set to be smaller than the dimension Hc (b3 < Hc). Similarly, as shown in FIG. 9(a), when the first connector 70A is viewed in the negative x-axis direction from the side opposite to the second connector 70B, the dimension b4 in the y-axis direction from the center C of the ball portion 713 to the first edge 60A of the movable plate 60 is set to be smaller than the dimension Hc (b4 < Hc).

[0058] The shielding member 30 configured in this manner can be manufactured using the connector set 7 shown in FIG. 11. The connector set 7 is composed of four connectors 70. Here, each connector 70 shown in FIG. 11 is in a state before being placed between the fixed plate 50 and the movable plate 60. When the positions of the two gaps 725E used as the first gap 725A and the second gap 725B when attached to the shielding member 30 are explained in terms of the xyz coordinate system set in the shielding member 30, the two gaps 725E of each connector 70 are arranged in a first direction D1 perpendicular to the central axis G1 and a second direction D2 perpendicular to the central axis G1 and the first direction D1 from the central axis G1 of the gripping portion 723 of the ball receiving portion 720, respectively. Reference numeral 725F in the figure denotes two gaps corresponding to the third gap 725C and the fourth gap 725D. The illustrated connector set 7 includes two first type connectors 700A and two second type connectors 700B, the first type connectors 700A and the second type connectors 700B have different shapes, the first type connector 700A is used as the first connector 70A and the third connector 70C, and the second type connector 700B is used as the second connector 70B and the fourth connector 70D. The four connectors may be formed in the same shape.

[0059] (How to open the movable plate 60) In the heat exchange type ventilation device 1 of this embodiment, the details will be described later, but when exposing the lower opening 111 of the main body 10 from the closed state, the connection state of the two connectors 70 arranged in the x-axis direction is released, and the ball receiving parts 720 provided on the movable plates 60 of the two connectors 70 that are further maintained in the connected state while maintaining the connection state of the remaining two connectors 70 are moved with a virtual line connecting the ball parts 713 as the center of movement, so that the movable plate 60 can be opened. Alternatively, the connection state of the two connectors 70 arranged in the y-axis direction can be released, and the ball receiving parts 720 provided on the movable plates 60 of the two connectors 70 that are further maintained in the connected state while maintaining the connection state of the remaining two connectors 70 are moved with a virtual line connecting the ball parts 713 as the center of movement, so that the movable plate 60 can be opened. In addition, in the heat exchange type ventilation device 1, when opening the movable plate 60, of the four connecting devices 70, there are two sets of connecting devices 70 arranged in the x-axis direction and two sets of connecting devices 70 arranged in the y-axis direction as combinations that support the movable plate 60 in a connected state, and there are four ways in which the movable plate 60 can be opened.

[0060] (First way to open) In the first opening method, the movable plate 60 is opened by supporting the movable plate 60 with a second connector 70B and a third connector 70C arranged on one second edge 60B side of the movable plate 60 and aligned in the y-axis direction. As shown in FIG. 2, when the movable plate 60 is lowered from the closed state in which the movable plate 60 covers the opening 500 of the fixed plate 50, the distance W70 between the tip ends 723D of the holding portions 723B of the first connector 70A and the fourth connector 70D is widened by the ball portion 713, and the ball portion 713 is disengaged from the holding portion 723, and the connected state of the first connector 70A and the connected state of the fourth connector 70D are released.

[0061] 12(a), from a state in which the connection end 712A of each ball support portion 710 is disposed at the ball entrance 723E of the gripping portion 723, the two ball receiving portions 720 can be moved with the imaginary line L1 passing through the center C of the two ball portions 713 as the center (axis) of movement, while the two ball portions 713 are each gripped by the gripping portion 723. This imaginary line L1 is parallel to the second edge 60B of the movable plate 60 and extends in the y-axis direction.

[0062] In the closed state of the movable plate 60, the ball receiving portion 720 of the second connector 70B has a first gap 725A for receiving the connection end 712A of the ball support portion 710 in a direction (the x-axis reverse direction d12 shown in FIG. 10(b)) perpendicular to the imaginary line L1 connecting the centers C of the ball portions 713 of the second connector 70B and the third connector 70C and the z-axis direction passing through this center C. The ball receiving portion 720 of the third connector 70C also has a first gap 725A for receiving the connection end 712A of the ball support portion 710 in a direction (the x-axis reverse direction d12 shown in FIG. 10(c)) perpendicular to the imaginary line L1 connecting the centers C of the ball portions 713 of the second connector 70B and the third connector 70C and the z-axis direction passing through this center C. As a result, the second connector 70B and the third connector 70C can change the position of the connection end 712A from the position of the ball entrance 723E to the position of the first gap 725A in a state in which the ball support portion 710 and the ball receiving portion 720 are connected. Note that the portion of the first extending portion 712 on the fixed plate 50 side from the connection end 712A is configured not to collide with the gripping portion 723.

[0063] Then, when each ball receiving portion 720 of the second connector 70B and the third connector 70C moves about the imaginary line L1 to insert the connection end portion 712A (first extension portion 712) of the ball support portion 710 into the first gap 725A, the angle formed between the ball support portion 710 and the ball receiving portion 720 with the ball portion 713 as the center changes significantly as shown in FIG. 12(b). Here, the angle θ11 formed between the ball support portion 710 and the ball receiving portion 720 in the open state of the movable plate 60 is the angle formed between the central axis G1 of the grip portion 723 and the central axis G3 of the ball support portion 710, as shown in FIG. 13, and the angle θ11 is 90 degrees. The central axis G3 is a virtual line that passes through the center C of the ball portion 713 and is perpendicular to the first opposing surface 50C. The edge 723F of the pad portion 723A hits the connection end 712A (first extension portion 712) of the ball support portion 710, so that the ball receiving portion 720 is prevented from moving any further around the imaginary line L1. In this way, the connection end 712A of the ball support portion 710 functions as a stopper. The angle θ10 is the angle between the ball support portion 710 and the ball receiving portion 720 when the movable plate 60 is in the closed state. In this case, the ball receiving portion 710 is in a state in which the central axis G1 is extended vertically, and the central axis G1 of the gripping portion 723 coincides with the extension line of the central axis G3 of the ball support portion 710. The maximum angle θ1 (=θ10-θ11) that the ball receiving portion 710 moves around the imaginary line L1 from the closed state in which the movable plate 60 spreads horizontally by extending the central axis G1 vertically to the closed state in which the ball receiving portion 710 moves around the imaginary line L1 until the movement is prevented by the stopper is 90 degrees. In FIG. 13, the center C (imaginary line L1) is represented by ●.

[0064] The movable plate 60 is held in an open state with the other second edge 60B side of the movable plate 60 lowered by its own weight, and the opposite second edge 60B side facing up, with the second opposing surface 60C facing sideways. At this time, on the second edge 60B side where the second connector 70B and the third connector 70C are provided on the movable plate 60, a gap may be formed between the edge 723F of the pad portion 723A and the stopper (the connection end 712A of the ball support portion 710), in which case the angle θ11 is less than 90 degrees. Alternatively, the edge 723F of the pad portion 723A may be configured to abut against the stopper (the connection end 712A of the ball support portion 710) to hold the open state.

[0065] In this way, by maintaining the connection states of the second connectors 70B and the third connectors 70C arranged in the y-axis direction and moving their ball receiving portions 720 with the virtual line L1 as the center (axis) of movement, the movable plate 60 can be opened as shown in FIG. 14. Further, as shown in FIG. 6, since the dimension b3 in the x-axis direction from the second edge 60B of the movable plate 60 to the center C of the ball portion 713 is set to be smaller than the dimension Hc (b3 < Hc), the movable plate 60 can be opened without contacting the fixed plate 50. In the state where the movable plate 60 is opened as shown in FIG. 13, one of the second edges 60B of the movable plate 60 approaches the fixed plate 50 via the clearance CL1. When the movable plate 60 is opened, the lower opening 111 of the main body portion 10 and further the recess 112 are exposed.

[0066] (Second opening method) In the second opening method, the movable plate 60 is supported by the first connectors 70A and the fourth connectors 70D arranged on the other second edge 60B side of the movable plate 60 and arranged in the y-axis direction, and the movable plate 60 is opened. As shown in FIG. 2, when one of the second edge 60B sides (the second edge 60B side where the second connectors 70B and the third connectors 70C are provided) of the movable plate 60 is lowered from the closed state where the movable plate 60 shields the opening 500 etc. of the fixed plate 50, in the gripping portions 723 of the second connectors 70B and the third connectors 70C, the interval W70 between the tip ends 723D of the respective pressing portions 723B is widened by the ball portion 713 and the ball portion 713 comes off from the gripping portion 723, and the connection states of the second connectors 70B and the third connectors 70C are released.

[0067] Further, in the first connectors 70A and the fourth connectors 70D on the other second edge 60B side, in the same manner as the second connectors 70B and the third connectors 70C on one of the second edge 60B sides shown in FIG. 12(a), from the state where the connection end portions 712A of the ball support portions 710 are arranged at the ball inlets / outlets 723E of the gripping portions 723, while the two ball portions 713 are respectively held by the gripping portions 723, the two ball receiving portions 720 can be moved with the virtual line L1 passing through the centers C of the two ball portions 713 as the center (axis) of movement. Note that the virtual line L1 in this case is also parallel to the second edge 60B and extends in the y-axis direction.

[0068] In the closed state of the movable plate 60, the ball receiving portion 720 of the first connector 70A has a first gap 725A for receiving the connection end 712A of the ball support portion 710 in a direction (x-axis direction d11 shown in FIG. 10(a)) perpendicular to the imaginary line L1 connecting the centers C of the ball portions 713 of the first connector 70A and the fourth connector 70D and the z-axis direction passing through this center C. The ball receiving portion 720 of the fourth connector 70D also has a first gap 725A for receiving the connection end 712A of the ball support portion 710 in a direction (x-axis direction d11 shown in FIG. 10(d)) perpendicular to the imaginary line L1 connecting the centers C of the ball portions 713 of the first connector 70A and the fourth connector 70D and the z-axis direction passing through this center C. As a result, when the ball support portion 710 and the ball receiving portion 720 of the first connector 70A and the fourth connector 70D are connected, the position of the connection end 712A can be changed from the position of the ball entrance / exit 723E to the position of the first gap 725A.

[0069] Then, when the ball receiving portions 720 of the first connector 70A and the fourth connector 70D move about the imaginary line L1 to insert the connection end portion 712A (first extension portion 712) of the ball support portion 710 into the first gap 725A, the angle formed between the ball support portion 710 and the ball receiving portion 720 with the ball portion 713 at the center changes significantly.

[0070] In this way, by maintaining the connected state of the first connector 70A and the connected state of the fourth connector 70D and moving their ball receiving portions 720 around the imaginary line L1 as the center (axis) of movement, the movable plate 60 can be opened as shown in Figure 15, exposing the lower opening 111 of the main body portion 10, etc.

[0071] (Third way to open) In the third opening method, the movable plate 60 is opened while being supported by a first connector 70A and a second connector 70B arranged on one side of the first edge 60A and aligned in the x-axis direction. As shown in FIG. 2, when the other first edge 60A side of the movable plate 60 (the first edge 60A side on which the third connector 70C and the fourth connector 70D are provided) is lowered from the closed state in which the movable plate 60 covers the opening 500 of the fixed plate 50, the distance between the tip ends 723D of the pressing portions 723B of each of the gripping portions 723 of the third connector 70C and the fourth connector 70D is widened by the ball portion 713, and the ball portion 713 is disengaged from the gripping portion 723, and the connected state of the third connector 70C and the connected state of the fourth connector 70D are released.

[0072] 16(a), from a state in which the connection end 712A of the ball support part 710 is disposed at the ball entrance 723E of the grip part 723, the two ball receiving parts 720 can be moved in parallel with the imaginary line L2 passing through the center C of the two ball parts 713 as the center (axis) of movement, while the two ball parts 713 are each gripped by the grip part 723. In this case, the imaginary line L2 is parallel to the first edge 60A, and the imaginary line L2 extends in the x-axis direction.

[0073] In the closed state of the movable plate 60, the ball receiving portion 720 of the first connector 70A has a second gap 725B for receiving the connection end 712A of the ball support portion 710 in a direction (y-axis direction d21 shown in FIG. 10(a)) perpendicular to the imaginary line L2 connecting the centers C of the ball portions 713 of the first connector 70A and the second connector 70B and the z-axis direction passing through this center C. The ball receiving portion 720 of the second connector 70B also has a second gap 725B for receiving the connection end 712A of the ball support portion 710 in a direction (y-axis direction d21 shown in FIG. 10(b)) perpendicular to the imaginary line L2 connecting the centers C of the ball portions 713 of the first connector 70A and the second connector 70B and the z-axis direction passing through this center C. As a result, when the ball support portion 710 and the ball receiving portion 720 of the first connector 70A and the second connector 70B are connected, the position of the connection end portion 712A can be changed from the position of the ball entrance / exit 723E to the position of the second gap 725B.

[0074] Then, when each ball receiving portion 720 of the first connector 70A and the second connector 70B moves about the imaginary line L2 to insert the connection end 712A (first extension portion 712) of the ball support portion 710 into the second gap 725B, the angle formed by the ball support portion 710 and the ball receiving portion 720 with the ball portion 713 as the center changes significantly as shown in FIG. 16(b). Here, the angle θ21 formed by the ball support portion 710 and the ball receiving portion 720 in the open state of the movable plate 60 is the angle formed by the central axis G1 of the grip portion 723 and the central axis G3 of the ball support portion 710 as shown in FIG. 17, and the angle θ21 is 90 degrees. The ball receiving portion 720 is prevented from moving any further around the imaginary line L2 by abutting the edge portion 723F of the pad portion 723A against the connection end 712A (first extension portion 712) of the ball support portion 710. The connection end 712A of the ball support part 710 functions as a stopper. The maximum angle θ2 (=θ10-θ21) that the ball receiver 710 moves around the imaginary line L2 from the closed state in which the ball receiver 710 extends vertically along the central axis G1 and the movable plate 60 spreads horizontally until the movement is stopped by the stopper (the connection end 712A of the ball support part 710) is 90 degrees. In Fig. 17, the center C (imaginary line L2) is represented by ●.

[0075] The movable plate 60 is held in an open state in which the other first edge 60A side of the movable plate 60 is lowered by its own weight, and the opposite first edge 60A side is turned up and the second opposing surface 60C is turned sideways. At this time, a gap may be formed between the edge 723F of the pad portion 723A and the stopper (the connection end 712A of the ball support portion 710). In this case, the angle θ21 is less than 90 degrees. Alternatively, the edge 723F of the pad portion 723A may be configured to abut against the stopper (the connection end 712A of the ball support portion 710) to hold the open state.

[0076] In this way, by maintaining the connection states of the first connector 70A and the second connector 70B and having their ball receiving portions 720 move with the virtual line L2 as the center (axis) of operation, the movable plate 60 can be opened as shown in FIG. 18. Also, as shown in FIG. 9(a), since the dimension b4 in the y-axis direction from the first edge 60A of the movable plate 60 to the center C of the ball portion 713 is set to be smaller than the dimension Hc (b4 < Hc), the movable plate 60 can be opened without being pressed against the fixed plate 50. In the state where the movable plate 60 is opened as shown in FIG. 17, one first edge 60A of the movable plate 60 approaches the fixed plate 50 via the clearance CL2. When the movable plate 60 is opened in this way, the lower opening 111 of the main body portion 10 and the like can be exposed.

[0077] (Fourth opening method) In the fourth opening method, the movable plate 60 is supported by a third connector 70C and a fourth connector 70D arranged on the other first edge 60A side of the movable plate 60 and aligned in the x-axis direction, and the movable plate 60 is opened. As shown in FIG. 2, when one first edge 60A side (the first edge 60A side where the first connector 70A and the second connector 70B are provided) of the movable plate 60 is lowered from the closed state where the movable plate 60 shields the opening 500 of the fixed plate 50 and the like, the distance between the tip portions 723D of the respective pressing portions 723B in the gripping portions 723 of the first connector 70A and the second connector 70B is widened by the ball portion 713, and the ball portion 713 comes off from the gripping portion 723, and the connection states of the first connector 70A and the second connector 70B are released.

[0078] 16(a) (the movable plate 60 is opened while the connected state of the first connector 70A on one side of the first edge 60A is maintained and the connected state of the second connector 70B is maintained), the two ball receiving parts 720 can be moved from a state in which the connection end 712A of the ball support part 710 is disposed in the ball entrance 723E of the grip part 723, with the two ball parts 713 being gripped by the grip part 723, with the imaginary line L2 passing through the center C of the two ball parts 713 as the center (axis) of movement. Note that the imaginary line L2 in this case is also parallel to the first edge 60A and extends in the x-axis direction.

[0079] In the closed state of the movable plate 60, the ball receiving portion 720 of the third connector 70C has a second gap 725B for receiving the connection end 712A of the ball support portion 710 in a direction (y-axis reverse direction d22 shown in FIG. 10(c)) perpendicular to the imaginary line L2 connecting the centers C of the ball portions 713 of the third connector 70C and the fourth connector 70D and the z-axis direction passing through this center C. The ball receiving portion 720 of the fourth connector 70D also has a second gap 725B for receiving the connection end 712A of the ball support portion 710 in a direction (y-axis reverse direction d22 shown in FIG. 10(d)) perpendicular to the imaginary line L2 connecting the centers C of the ball portions 713 of the third connector 70C and the fourth connector 70D and the z-axis direction passing through this center C. As a result, when the ball support portion 710 and the ball receiving portion 720 of the third connector 70C and the fourth connector 70D are connected to each other, the position of the connection end 712A can be changed from the position of the ball entrance / exit 723E to the position of the second gap 725B.

[0080] Then, when each ball receiving portion 720 of the third connector 70C and the fourth connector 70D moves about the imaginary line L2 to insert the connection end portion 712A (first extension portion 712) of the ball support portion 710 into the second gap 725B, the angle formed between the ball support portion 710 and the ball receiving portion 720 with the ball portion 713 at the center changes significantly.

[0081] In this way, by maintaining the connected state of the third connector 70C and the connected state of the fourth connector 70D and moving their ball receiving portions 720 about the imaginary line L2 as the center (axis) of movement, the movable plate 60 can be opened as shown in Fig. 19. By opening the movable plate 60 in this way, the lower opening 111 of the main body 10 and the like can be exposed.

[0082] (Cleaning of shielding member 30, etc.) For example, in the heat exchange type ventilation device 1 shown in Fig. 20(a), when cleaning the inside of the shielding member 30, the movable plate 60 can be opened according to the first opening method by releasing the connection state of the first connector 70A and the connection state of the fourth connector 70D, respectively, while maintaining the connection state of the second connector 70B and the connection state of the third connector 70C, respectively, that is, by supporting the movable plate 60 with the second connector 70B and the third connector 70C, as shown by the dashed line. If the gap W60 between the movable plate 60 and the wall 400 is narrow in the open state of the movable plate 60, the work of cleaning the lower opening 111 of the main body 10 exposed by opening the movable plate 60 becomes cumbersome.

[0083] In this embodiment, there are four ways to open the movable plate 60, and instead of the first opening way described above, for example, as shown in Fig. 20(b), if the second opening way is used in which the movable plate 60 is opened while being supported by the first connector 70A and the fourth connector 70D near the wall, a wide working space can be secured below the fixed plate 50, facilitating the cleaning work of the inside of the shielding member 30 and the inside of the lower opening 111 of the main body 10. With the movable plate 60 open, the work of removing the filter 15A from the filter device 15 and the like can also be facilitated.

[0084] 26, the conventional ventilation device 200 is provided with only one axis that is the center of the opening and closing operation of the cover 222, and the position of the axis cannot be changed, so when the cover 222 is opened to expose the inside, the gap w between the cover 222 and the wall 400 may be narrow. This may make cleaning and other tasks complicated.

[0085] In addition, in the conventional ventilation device 200 shown in FIG. 26, if the angle θ between the open cover 222 and the opening is small, operation can become complicated. However, in the heat exchanger type ventilation device 1 of this embodiment, the movable plate 60 is arranged vertically in the open state, so that a wide space can be secured below the lower opening 111.

[0086] In this way, according to the heat exchanger type ventilation device 1 of this embodiment, the opening direction of the movable plate 60 can be selected from four different opening directions regardless of the direction of the main body 10 placed above the ceiling, so that even if there is a wall nearby, the movable plate 60 can be opened to ensure a large working space. This makes it easy to perform maintenance such as cleaning of the heat exchanger type ventilation device 1.

[0087] By connecting the fixed plate 50 and the movable plate 60 using the connector set 7, it is possible to configure the shielding member 30 in which four axes serving as the center of movement of the movable plate 60 can be selected when exposing the lower opening 111. This makes it convenient because the movable plate 60 can be moved relative to the fixed plate 50 by arbitrarily selecting one of the four axes.

[0088] 21 shows a heat exchange type ventilation device 2 according to a modification of the first embodiment, which includes a linear member 80 having one end fixed to a fixed plate 50 and the other end fixed to a movable plate 60, and can prevent the movable plate 60 from falling. One end of the linear member 80 may be attached to the ceiling insertion part 40 or the main body 10 instead of the fixed plate 50.

[0089] [Second embodiment] The ventilation device 3 shown in FIGS. 22(a) and (b) includes a main body 10A to which an exhaust duct 92 is connected, and a shielding member 30 fixed to the main body 10A.

[0090] The main body 10A is connected from a lower opening 111 facing downward through a hollow interior to the inside of a duct connection part protruding from a side surface. Note that the same components as those in the above embodiment are given the same reference numerals and their description will be omitted.

[0091] The ventilation device 3 is arranged such that the main body 10A is suspended in the space S11 above the ceiling using the metal fittings shown in the figure, the ceiling insertion part 40 of the shielding member 30 is passed through the opening 310 in the ceiling 300, and the ceiling insertion part 40 is further inserted into the lower opening 111, and the shielding member 30 is fixed to the main body 10A with screws or the like. The fixed plate 50, the movable plate 60 and the connector 70 are arranged inside the room.

[0092] The ventilation device 3 is provided at the upstream end of the exhaust system and functions as the exhaust port. Unlike the heat exchange type ventilation device 1 of the first embodiment, the ventilation device 3 does not have a heat exchanger or a blower (for intake and exhaust) inside, and the ventilation device 3 sucks air from the room under the ceiling through the gap 55 by a ventilation device provided with a downstream exhaust system blower connected via an exhaust system duct 92. In Fig. 22(b), the flow of indoor air is indicated by arrows EA.

[0093] This type of exhaust ventilation device 3 is provided with a shielding member 30, similar to the heat exchange type ventilation device 1, and by selecting the way to open the movable plate 60 depending on the installation situation of the ventilation device 3, a wide working space can be secured below the opening 500 of the fixed plate 50. This makes it easy to perform work such as cleaning the inside of the shielding member 30.

[0094] [Third embodiment] The air conditioner 4 shown in Figs. 23(a) and (b) is a packaged air conditioner that performs air conditioning (cooling and heating) by circulating air. The air conditioner 4 includes a main body 10B that houses a heat exchanger, a blower, and the like, and a shielding member 30A that shields a lower opening 131A of the main body 10B facing downward. Note that the same components as those in the above embodiment are given the same reference numerals and their description will be omitted.

[0095] The main body 10B is suspended in a space S11 above the ceiling using the metal fittings shown in the figure. The shielding member 30A includes a fixed plate 50 formed in a ring shape, a movable plate 600 formed in a rectangular outline, and four connectors 70 that connect the fixed plate 50 and the movable plate 600 and hold the movable plate 600 below the fixed plate 50.

[0096] Furthermore, unlike the movable plate 60, the movable plate 600 has a plurality of ventilation holes 610 penetrating in the thickness direction, and a tubular portion 620 extends from the flat surface around the plurality of ventilation holes 610 to the lower opening 131A, so that indoor air is sent from the holes 610 through the tubular portion 620 and then through the lower opening 131A into the main body portion 10B.

[0097] Furthermore, the shielding member 30A includes an inner cylinder portion 510 extending from the inner peripheral edge of the fixed plate 50, and an outer cylinder portion 520 extending from the outer peripheral edge of the fixed plate 50 to the opposite side to the inner cylinder portion 510. The fixed plate 50, the inner cylinder portion 510, and the outer cylinder portion 520 may be integrally molded, or may be integrally formed by combining parts that are molded separately.

[0098] With the inner cylinder portion 510 inserted through the lower opening 131A of the main body portion 10B, the fixed plate 50 is fixed to the attachment portion 131 provided with the lower opening 131A.

[0099] The movable plate 600 is disposed below the fixed plate 50 by the four connectors 70, and the lower opening 131A and the opening 500 of the fixed plate 50 are covered, and in this state, the outer cylinder portion 520 surrounds the connectors 70 and the movable plate 600. Note that in Fig. 23(b), configurations such as a heat exchanger and a blower inside the main body portion 10B are omitted.

[0100] In the air conditioner 4, as shown by arrow A1, indoor air is taken into the inside of the main body 10B through holes 610 in the movable plate 600, and then the conditioned air undergoes heat exchange and is returned to the room as shown by arrow A2. The air conditioner 4 has four air outlets to blow out the conditioned air in four directions, and each air outlet is provided with a louver 181.

[0101] In this air conditioner 4, similarly to the heat exchange type ventilation device 1, the movable plate 600 is connected to the fixed plate 50 via four connectors 70, and by selecting the way to open the movable plate 600, a wide working space can be secured below when the movable plate 600 is open. This makes it easy to carry out work such as cleaning the inside of the shielding member 30A. The air conditioner is not limited to a type dedicated to circulating indoor air, but may be a type that circulates indoor air while exhausting a portion of the indoor air and supplying outside air in parallel. Also, the air conditioner is not limited to a package type, but may be a separate type.

[0102] [Fourth embodiment] The ventilation structure 5 shown in Fig. 24 provides ventilation between a floor 5A forming an air flow path and a room adjacent to the floor 5A across a ceiling 300, and a shielding member 30 shields a ventilation opening 310 formed in the ceiling 300. For example, the floor 5A is a space formed between the ceiling 300 of the first floor and the floor 350 of the second floor, and is configured to be highly airtight. Note that the same components as those in the above embodiment are denoted by the same reference numerals, and their description will be omitted.

[0103] The shielding member 30 is attached by fixing the fixing plate 50 to the indoor surface of the ceiling with screws or the like, with the ceiling insertion portion 40 passing through an opening 310 in the ceiling 300.

[0104] In this ventilation structure 5, for example, a heat exchange type ventilation device (not shown) is provided between floors 5A, and when this heat exchange type ventilation device supplies air to the between floors 5A, the outside air flows through the between floors 5A and is further supplied to the room through the shielding member 30.

[0105] In this way, in the ventilation structure 5, by providing the shielding member 30, the way in which the movable plate 60 is opened can be selected, and a wide working space can be secured below the opening 500 of the fixed plate 50. This makes it easier to carry out work such as cleaning the shielding member 30 and the floor space 5A.

[0106] The present invention can be practiced without being limited to the above-described and illustrated examples.

[0107] 22 is desirably provided with a filter (not shown) for collecting foreign matter contained in the air sucked in through the gap 55. This filter is made of, for example, a plurality of synthetic resin fibrous materials stretched over a frame, and is replaceably provided on the ventilation device 3, and can be removed by opening the movable plate 60. The ventilation device 3 for supplying air may also be provided with a filter therein.

[0108] Also, instead of providing the ventilation device 3 at the upstream end of the exhaust system, it may be provided at the downstream end of the air supply system to function as the air supply port. For example, a ventilation device having an upstream blower connected to the ventilation device 3 via an air supply system duct supplies outside air into the room through the gap 55 between the fixed plate 50 and the movable plate 60. In this case, air flows in the opposite direction to the exhaust direction EA shown in FIG. 22(b).

[0109] Further, although not shown in the drawings, the ventilation device 3 for exhaust or supplying air may be provided with an air blower inside.

[0110] In the above embodiment, the shielding member is configured to shield the lower opening of the ventilation device, the lower opening of the air conditioner, and the vent formed in the ceiling, but the vent that the shielding member shields is not limited to these. For example, a vent for ventilation or air conditioning of a building may be provided in a wall. The vent is not limited to the indoor side, but may be on an exterior wall or under the eaves on the outdoor side. The ventilation device or air conditioner is not limited to the direction in which the vent faces, and may be provided with a vent facing sideways or an vent facing upwards. Here, the reference numeral 100 in FIG. 25 represents a vent for ventilation or air conditioning of a building, or a vent for a ventilation device or an air conditioner fixed to the building, and shows a state in which the shielding member 30 shields the vent 100. The z axis of the shielding member 30 is disposed in a direction in which the z coordinate increases toward the vent 100 side, passing through the opening 500 of the fixed plate 50. In this state, the vent 100 is open facing the z-axis direction opposite to the z-axis direction, and the opening 500 of the fixed plate 50 is shifted in the z-axis direction from the vent 100. Furthermore, the movable plate 60 is shifted in the z-axis direction from the opening 500 of the fixed plate 50 by the connector 70, and the opening 500 of the fixed plate 50 and the vent 100 are shielded. At this time, the z-axis is not limited to being vertical, and the z-axis direction is not limited to being upward. In addition, the vent 100 shielded by the shielding member 30 may be either an intake or an exhaust vent. The ventilation device or air conditioner provided with the vent 100 is not limited to being placed in the ceiling, inside the wall, under the floor, etc. of a building, but may be attached to the wall and placed in a room. In addition, the z-axis does not necessarily have to pass through the center of the opening in the fixed plate, but may be positioned through the opening in the fixed plate and the four connecting parts may be positioned so as to divide the coordinates projected onto the xy plane into the first quadrant, the second quadrant, and the fourth quadrant, respectively.

[0111] (Fixed plate) In the above embodiment, the outline is formed into a right-angled quadrilateral and the four corners 51 are provided as corner opposing portions opposing the corners of the movable plate, but the shape is not limited to this as long as it has four corner opposing portions respectively opposing the four corners of the movable plate.

[0112] (movable plate) Although the movable plate in the above embodiment is provided with the third reinforcing portion, this third reinforcing portion may be omitted, or the protruding height or dimensions may be changed.

[0113] (Connector) In the above embodiment, the ball support portion is provided on the fixed plate and the ball receiving portion is provided on the movable plate, but the shielding member may be configured by providing the ball support portion on the movable plate and providing the ball receiving portion on the movable plate.

[0114] (Ball support part) The ball support part is not limited to the configuration shown in the figure, and has a ball part and a connection end part that passes through the first gap and the second gap of the grip part, and as long as it does not collide with the grip part when the movable plate is opened, the structure on the opposite surface side from the connection end part is not limited, and may be, for example, a platform, etc. Also, in the ball part, the notch part and the recessed part may be omitted and these parts may be provided as parts that form a spherical surface. The ball support may be constructed of metal as a so-called ball stud. When the ball support portion is provided on a movable plate having a third reinforcing portion, the ball support portion may include an abutment portion that abuts against the connecting portion of the third reinforcing portion. The ball support portion can be positioned by abutting the abutment portion against the connecting portion of the third reinforcing portion.

[0115] (Ball receiving part) The ball receiving portion is not limited to the configuration shown in the figure. For example, the second extension portion shown in Figure 9 is formed in a cylindrical shape, but the second extension portion may be rod-shaped or a platform larger than the gripping portion as long as it supports the gripping portion. The ball receiving portion may be configured without the abutment portion that abuts against the connection portion of the third reinforcing portion. As long as the grip portion has the first gap and the second gap, the number of pressing portions provided on the grip portion and the number of gaps are not limited to four. By changing the height of the edge of the pad portion of the gripping portion that contacts the connecting end of the ball support portion, the maximum opening angles θ1, θ2 of the movable plates can be made smaller than 90 degrees. [Explanation of symbols]

[0116] 1,2 Heat exchange type ventilation system 3. Ventilation system 4. Air conditioners 5. Ventilated structure 5A Floor 10 Main body 111,131A Bottom opening 20 Duct connection 30,30A Shielding material 40 Ceiling insertion part 44 Mounting part 50 Fixed plate 500 aperture 50A First Edge 50B Second Edge 51 Corner (opposite corner) 60,600 Movable plate 60A First Edge 60B Second Edge 61 Corner 7 Connector set 70 Connector 70A First connector 70B Second connector 70C Third connector 70D Fourth connector 710 Ball support 711 First base part 712 First extension 713 Ball section 714 First reinforcement section 720 Ball receiving part 721 Second base part 722 Second extension part 723 Gripping part 723A Pad section 723B Clamp 723E Ball entrance / exit 724 Second reinforcement part 725A First gap 725B Second gap 725C Third gap 725D Fourth gap 100 Vent CL1,CL2 clearance

Claims

1. A ventilation device comprising: a main body portion disposed in a space above the ceiling and connected to a duct; and a shielding member for shielding a lower opening for ventilation of the main body portion facing downward, The shielding member is a fixed plate formed in an annular shape and having an opening disposed below the lower opening; A movable plate; A connector that connects the fixed plate and the movable plate, the movable plate has a pair of first edges extending in an x-axis direction along an x-axis perpendicular to a z-axis whose z-coordinate increases as it passes through the opening of the fixed plate and goes upward from the opening, and a pair of second edges extending in a y-axis direction along a y-axis perpendicular to the z-axis and the x-axis whose y-coordinate increases, and the contour of the movable plate is formed in a rectangular quadrilateral shape; The connectors are disposed between the corners of the movable plate and the corner opposing portions of the fixed plate that are opposed to the corners, Furthermore, the connector includes: a ball support portion protruding from one of the corner opposing surfaces of the fixed plate and the movable plate and having a ball portion at a tip thereof; a ball receiving portion made of synthetic resin, protruding from the corner opposing portion of the fixed plate and the other opposing surface of the corner portion of the movable plate, and having a gripping portion at a tip thereof for detachably gripping the ball portion, With the four connectors connecting the ball support portion and the ball receiving portion, the movable plate is disposed at a distance from the fixed plate in the z-axis opposite direction in which the z coordinate decreases along the z-axis, and the lower opening is shielded; This ventilation device is characterized in that, when the movable plate is moved from a state in which the lower opening is blocked by the movable plate to expose the lower opening, two of the four connecting devices aligned in the x-axis or y-axis direction maintain a connected state between the ball support portion and the ball receiving portion, thereby forming an axis that is the center of movement of the movable plate, and further characterized in that four of the axes are provided to be selectable.

2. The gripping portion is A pad portion having a hemispherical inner surface; 2. The ventilation device according to claim 1, further comprising a plurality of retaining portions protruding from a periphery of the pad portion and elastically contacting a hemispherical portion of the surface of the ball portion opposite the hemispherical portion in contact with the pad portion.

3. When the movable plate is in a state where the lower opening is covered, the gripping portion has a plurality of the pressing portions disposed around a central axis of the gripping portion extending in a z-axis direction, Of the four connectors, one has a coordinate system projected onto the xy plane in a first quadrant, one has a coordinate system projected onto the xy plane in a second quadrant, one has a coordinate system projected onto the xy plane in a third quadrant, and one has a coordinate system projected onto the xy plane in a fourth quadrant; The connector having coordinates in the first quadrant has a first gap formed between the pressing portions in the x-axis direction from the central axis, and a second gap formed between the pressing portions in the y-axis direction from the central axis, The connector having coordinates in the second quadrant has a first gap formed between the pressing portions in the x-axis direction opposite to the x-axis direction from the central axis, and a second gap formed between the pressing portions in the y-axis direction from the central axis, The connector having coordinates in the third quadrant has a first gap formed between the pressing portions in the x-axis direction opposite to the central axis, and a second gap formed between the pressing portions in the y-axis direction opposite to the y-axis direction from the central axis, The connector having coordinates in the fourth quadrant has a first gap formed between the pressing portions in the x-axis direction from the central axis, and a second gap formed between the pressing portions in the y-axis opposite direction from the central axis, the ball support portion is formed thinner than the ball portion and has a connection end portion connected to the ball portion, The ventilation device described in claim 2, characterized in that when the lower opening is exposed, if the two connecting devices that maintain the ball support portion and the ball receiving portion in a connected state are aligned in the x-axis direction, the connection end of the ball support portion is inserted into the second gap, and if the two connecting devices that maintain the ball support portion and the ball receiving portion in a connected state are aligned in the y-axis direction, the connection end of the ball support portion is inserted into the first gap.

4. 2. The ventilation device according to claim 1, wherein the ball support portion is made of synthetic resin.

5. The ball support portion is A first base fixed to the one of the opposing surfaces; a first extension portion that extends perpendicularly from the first base and has the connection end portion at a tip end thereof; The ball portion connected to a connection end portion of the first extension portion; A side surface of the first extension portion (excluding the connection end portion) protruding from the first base portion is connected to the side surface of the first extension portion. The ventilation device according to claim 1 , further comprising at least one first reinforcing portion supporting the first extension portion.

6. The ball receiving portion is A second base fixed to the other opposing surface; A second extension portion extending perpendicularly from the second base; The grip portion provided at a tip of the second extension portion; The ventilation device according to claim 1 , further comprising at least one second reinforcing portion protruding from the second base portion, connected to a side surface of the second extension portion, and supporting the second extension portion.

7. 2. The ventilation device according to claim 1, wherein the ball support portion is provided at the corner facing portion of the fixed plate, and the ball receiving portion is provided at the corner portion of the movable plate.

8. the movable plate includes a third reinforcing portion protruding from a surface facing the fixed plate, the third reinforcing portion includes a first protruding portion extending in the x-axis direction, a second protruding portion extending in the y-axis direction, and a connection portion formed by connecting the first protruding portion and the second protruding portion and disposed near the corner portion of the movable plate, and is formed in a right-angled quadrilateral shape in a plan view when viewed from a surface facing the fixed plate, The ventilation device described in claim 1, characterized in that the ball support portion or the ball receiving portion provided on the movable plate further has an abutment portion that abuts against the first protrusion portion and the second protrusion portion that constitute the connection portion of the third reinforcement portion.

9. The main body includes a filter that collects foreign matter.

9. The ventilation device according to claim 1, wherein the filter is configured to be inserted into and removed from the main body through the lower opening.

10. The ventilation device according to any one of claims 1 to 8, wherein the main body includes a blower.

11. 11. The ventilation device according to claim 10, wherein the blower comprises an exhaust blower and an intake blower, and the main body includes a heat exchanger for exchanging heat between outside air and indoor air.

12. An air conditioner having a lower opening facing the room below the ceiling, a shielding member for shielding the lower opening, The shielding member is a fixed plate formed in an annular shape and having an opening disposed below the lower opening; A movable plate; A connector that connects the fixed plate and the movable plate, the movable plate has a pair of first edges extending in an x-axis direction along an x-axis perpendicular to a z-axis whose z-coordinate increases as it passes through the opening of the fixed plate and goes upward from the opening, and a pair of second edges extending in a y-axis direction along a y-axis perpendicular to the z-axis and the x-axis whose y-coordinate increases, and the contour of the movable plate is formed in a rectangular quadrilateral shape; The connectors are disposed between the corners of the movable plate and the corner opposing portions of the fixed plate that are opposed to the corners, Furthermore, the connector includes: a ball support portion protruding from one of the corner opposing surfaces of the fixed plate and the movable plate and having a ball portion at a tip thereof; a ball receiving portion made of synthetic resin, protruding from the corner opposing portion of the fixed plate and the other opposing surface of the corner portion of the movable plate, and having a gripping portion at a tip thereof for detachably gripping the ball portion, With the four connectors connecting the ball support portion and the ball receiving portion, the movable plate is disposed at a distance from the fixed plate in the z-axis opposite direction in which the z coordinate decreases along the z-axis, and the lower opening is shielded; This air conditioner is characterized in that, when the movable plate is moved from a state in which the lower opening is blocked by the movable plate to expose the lower opening, two of the four connecting devices aligned in the x-axis or y-axis direction maintain a connected state between the ball support portion and the ball receiving portion, thereby forming an axis that is the center of movement of the movable plate, and further characterized in that four of the axes are provided to be selectable.

13. A ventilation structure that ventilates between a floor space that forms a flow path and a room adjacent to the floor space, with the ceiling as a boundary, A shielding member is provided to shield the ventilation hole formed in the ceiling, The shielding member is a fixing plate formed in an annular shape and having an opening disposed below the ventilation hole; A movable plate; A connector that connects the fixed plate and the movable plate, the movable plate has a pair of first edges extending in an x-axis direction along an x-axis perpendicular to a z-axis whose z-coordinate increases as it passes through the opening of the fixed plate and goes upward from the opening, and a pair of second edges extending in a y-axis direction along a y-axis perpendicular to the z-axis and the x-axis whose y-coordinate increases, and the contour of the movable plate is formed in a rectangular quadrilateral shape; The connectors are disposed between the corners of the movable plate and the corner opposing portions of the fixed plate that are opposed to the corners, Furthermore, the connector includes: a ball support portion protruding from one of the corner opposing surfaces of the fixed plate and the movable plate and having a ball portion at a tip thereof; a ball receiving portion made of synthetic resin, protruding from the corner opposing portion of the fixed plate and the other opposing surface of the corner portion of the movable plate, and having a gripping portion at a tip thereof for detachably gripping the ball portion, With the four connectors connecting the ball support portion and the ball receiving portion, the movable plate is disposed at a distance from the fixed plate in the z-axis opposite direction in which the z coordinate decreases along the z-axis, thereby blocking the vent hole; A ventilation structure characterized in that, when the movable plate is moved from a state in which the ventilation hole is blocked by the movable plate to expose the ventilation hole, two of the four connectors aligned in the x-axis or y-axis direction maintain a connected state between the ball support portion and the ball receiving portion, forming an axis that is the center of movement of the movable plate, and further characterized in that four of the axes are provided to be selectable.

14. A shielding member for shielding a ventilation or air conditioning vent of a building, or a vent of a ventilation device or an air conditioner fixed to the building, a fixing plate formed in an annular shape and having an opening communicating with the ventilation hole; A movable plate; A connector that connects the fixed plate and the movable plate, the movable plate has a pair of first edges extending in an x-axis direction along an x-axis perpendicular to a z-axis in which the z-coordinate increases as the movable plate passes through the opening of the fixed plate and moves from the opening toward the vent hole, and a pair of second edges extending in a y-axis direction along a y-axis perpendicular to the z-axis and the x-axis in which the y-coordinate increases, the outline of the movable plate being formed in a right-angled quadrilateral shape; The connectors are disposed between the corners of the movable plate and the corner opposing portions of the fixed plate that are opposed to the corners, Furthermore, the connector includes: a ball support portion protruding from one of the corner opposing surfaces of the fixed plate and the movable plate and having a ball portion at a tip thereof; a ball receiving portion made of synthetic resin, protruding from the corner opposing portion of the fixed plate and the other opposing surface of the corner portion of the movable plate, and having a gripping portion at a tip thereof for detachably gripping the ball portion, With the four connectors connecting the ball support portion and the ball receiving portion, the movable plate is disposed at a distance from the fixed plate in the z-axis opposite direction in which the z coordinate decreases along the z-axis, thereby blocking the vent hole; A shielding member characterized in that, when the movable plate is moved from a state in which the ventilation hole is blocked by the movable plate to expose the ventilation hole, two of the four connectors aligned in the x-axis or y-axis direction maintain a connected state between the ball support portion and the ball receiving portion, forming an axis that is the center of movement of the movable plate, and further characterized in that four selectable axes are provided.

15. A connector set including four connectors for connecting a fixed plate formed in an annular shape and a movable plate having a rectangular outline that covers an opening for ventilation in the fixed plate, and for configuring four axes that are central to the movement of the movable plate and are made of virtual lines connecting ball portions together, parallel to the outline, the connectors being disposed between the corners of the movable plate and the opposing corners of the fixed plate that face the corners, when exposing the opening in the fixed plate, the axes being four axes that are central to the movement of the movable plate and are made of virtual lines connecting ball portions together, the connector set including four connectors being disposed between the corners of the movable plate and the opposing corners of the fixed plate ... being arranged The connector includes: a ball support portion for mounting to one of the fixed plate and the movable plate, the ball portion being attached to a tip end via a connection end portion formed to have a diameter smaller than that of the ball portion; a ball receiving portion made of synthetic resin, the ball receiving portion being attached to the other of the fixed plate and the movable plate and having a gripping portion at a tip thereof for detachably gripping the ball portion; The gripping portion is A pad portion having a hemispherical inner surface; a plurality of pressing portions protruding from the periphery of the pad portion and elastically contacting a hemispherical portion of the surface of the ball portion opposite to the hemispherical portion that contacts the pad portion; A plurality of the pressing portions are provided around the central axis of the gripping portion, a connector set characterized in that, when the ball support portion and the ball receiving portion are connected, gaps into which the connection end portion of the ball support portion can be inserted are formed between the pressing portions in a first direction perpendicular to the central axis and in a second direction perpendicular to the central axis and the first direction, from the central axis.

16. The ball receiving portion is A second base fixed to the fixed plate or the movable plate; A second extension portion extending perpendicularly from the second base; The grip portion provided at a tip of the second extension portion; A second reinforcing portion extending perpendicularly from the second base portion, The fastener set according to claim 15, characterized in that the second reinforcing portion extends through a side surface of the second extension portion to a side surface of one of the pressing portions disposed between the two gaps.

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