JP2016138681A - Heat exchange ventilation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To acquire a heat exchange ventilation device in which a lid for blocking an opening for maintenance hardly disturbs maintenance work and which can form a larger opening.SOLUTION: A heat exchange ventilation device includes: a casing having a box shape; a heat exchange element provided inside the casing; a humidification part for humidifying a supply airflow; and a tabular-shaped lid having a blocking surface for blocking an opening for maintenance formed on a side plate of the casing. In the lid, a shaft part 83 is formed which protrudes in the horizontal direction. In the casing, a lid support piece 84 is formed which supports the shaft part 83 above the opening, and which allows the lid to rotate around a rotational axis 82 passing through the shaft part 83. In the lid support piece 84, a groove 85 is formed which extends in a vertical direction and in which the shaft part 83 is fitted. When the shaft part 83 is located at the upper part of the groove 85, the lid can rotate, and when the shaft part 83 is located at the lower part of the groove 85, the rotation of the lid is restricted and the posture is retained.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a heat exchange ventilator that performs ventilation while exchanging heat between a supply air flow and an exhaust flow.

  Patent Document 1 discloses a heat exchange ventilator that performs ventilation while exchanging heat between a supply air flow and an exhaust air flow in order to realize ventilation with little variation in indoor temperature and humidity. The exterior box of the heat exchange ventilator is formed with an opening for maintaining a heat exchange element and a humidifying part provided inside.

JP 2014-224663 A

  The opening formed in the exterior box is closed by a maintenance panel that is a lid. When maintaining the heat exchange element and the humidifying part provided in the exterior box, the maintenance panel is removed. However, dropping the removed maintenance panel may damage the maintenance panel itself or damage an object placed on the destination.

  Therefore, it is conceivable to connect the maintenance panel to the exterior box so that it can be opened laterally by a hinge structure. In this case, it is not necessary to remove the maintenance panel, and the maintenance panel can be easily held open. However, if the suspension support bar that supports the heat exchange ventilator from the ceiling surface is on the side of the opening, the size of the opening is limited to avoid interference between the maintenance panel and the suspension support bar. The efficiency of maintenance work may be reduced.

  The present invention has been made in view of the above, and an object of the present invention is to provide a heat exchange ventilator that can form a larger opening because a lid that closes the opening for maintenance is less likely to obstruct maintenance work. To do.

  In order to solve the above-described problems and achieve the object, the present invention has a box shape having a top plate, a bottom plate, and a side plate closing the space between the top plate and the bottom plate, and goes from the outside to the inside. A casing in which a supply air passage for passing a supply air flow and an exhaust ventilation passage for passing an exhaust flow from the room to the outside are formed inside, and the heat supply is exchanged between the supply air flow and the exhaust flow provided inside the casing. A heat exchange element, a humidifying part provided in the air supply passage for humidifying the air supply airflow, and a lid having a plate-like shape having a closed surface for closing the maintenance opening formed in the side plate. The lid is formed with a shaft portion that protrudes in a horizontal direction parallel to the side plate on which the opening is formed, and the casing supports the shaft portion above the opening and is centered on the rotation axis that passes through the shaft portion. A lid support piece that allows the lid to rotate is formed. A groove that extends to fit the shaft portion is formed, and a portion that overlaps the horizontal plane including the rotation shaft in a state in which the opening is closed in the outer surface that is the opposite surface of the closing surface of the lid is defined as a first reference portion. When the distance between the portion and the rotation axis is the first reference distance, the outer surface of the lid is located in a region above the first reference portion in a state where the lid closes the opening. Has a second reference portion that is a second reference distance larger than the first reference distance, and the groove is closer to the side plate having the opening at the lower side than the upper side, and the upper side of the groove. The distance between the side plate in which the opening is formed and the rotating shaft is in a state where the shaft portion is positioned on the rotating shaft, and the portion of the lid that is above the horizontal plane in the state where the opening is closed, and the rotating shaft of the lid The side plate with the opening and the rotating shaft with the shaft portion positioned below the groove Distance is characterized by comprising a first less than the reference distance or more and the second reference distance.

  According to the heat exchange ventilator according to the present invention, the lid that closes the maintenance opening is unlikely to obstruct the maintenance work, and the larger opening can be formed.

The perspective view of the heat exchange ventilation apparatus concerning Embodiment 1 of this invention. The perspective view of the humidification part in Embodiment 1 The partial expansion perspective view of the side plate in which the opening for a maintenance of the humidification part in Embodiment 1 was formed Front view of the maintenance panel in the first embodiment Side view of maintenance panel and side plate in a state in which opening is closed in embodiment 1 Side view of lid support piece in embodiment 1 The figure which shows the state which closed the opening in Embodiment 1 with the maintenance panel The figure which shows the state which rotated the maintenance panel 180 degrees from the state which obstruct | occluded the opening in Embodiment 1, and opened the opening The figure which shows the state which slid the maintenance panel in Embodiment 1 downward from the state shown in FIG. The figure which shows the state which rotated the maintenance panel 90 degree | times from the state which obstruct | occluded the opening in Embodiment 1, and opened the opening

  Below, the heat exchange ventilation apparatus concerning embodiment of this invention is demonstrated in detail based on drawing. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a perspective view of a heat exchange ventilator according to a first embodiment of the present invention. In FIG. 1, a part of the top plate 9 and the side plate 80 of the exterior box 5 that is a casing and a part of the built-in components are shown in a transparent manner. The heat exchange ventilator 50 is a heat exchange ventilator with a humidifying function having a humidifying function. The heat exchange ventilator 50 is suspended and supported from the ceiling surface, and supplies and exhausts air through a duct (not shown) to ventilate the room.

  The heat exchanging ventilator 50 is divided into three parts, that is, a total heat exchanging part 51, a humidifying part 52 and an indoor air passage part 53 according to functions. The exterior box 5 is configured in a rectangular parallelepiped box shape including a top plate 9, a bottom plate 10, and four side plates 80 that block between the top plate 9 and the bottom plate 10. A support protrusion 87 for hanging and supporting the heat exchange ventilator 50 is formed at the lower end of the outer box 5. For example, the heat exchange ventilator 50 is suspended and supported from the ceiling surface by engaging the support protrusion 87 with a suspension support rod (not shown) extending from the ceiling surface. In other words, the suspension support bar extends upward from the support protrusion 87.

  The interior of the exterior box 5 is partitioned into three parts by a partition plate 54, that is, a total heat exchanging part 51, a humidifying part 52, and an indoor air passage part 53. Inside the total heat exchanging section 51, there are formed an air supply passage for passing a supply air flow from the outside to the room and an exhaust air passage for passing an exhaust flow from the room to the outside.

  The air supply blower 6 is installed in the air supply ventilation path. The air supply passage passes the air supply air flowing from the outside to the room by the operation of the air supply blower 6. The air supply blower 6 is configured by surrounding an electric motor 61 and a blade member 62 that rotates by driving of the electric motor 61 with an air supply fan casing 63 formed in a spiral shape.

  The exhaust blower 7 is installed in the exhaust ventilation path. The exhaust ventilation path allows an exhaust flow from indoors to the outside through the operation of the exhaust blower 7. The exhaust blower 7 is configured by surrounding an electric motor 71 and a blade member 72 rotated by driving of the electric motor 71 with an exhaust fan casing 73 formed in a spiral shape.

  The heat exchanging element 8 is installed in the middle of the total heat exchanging section 51 in the middle of the air supply and exhaust ventilation paths. The heat exchange element 8 exchanges heat between the supply airflow passing through the supply air passage and the exhaust flow passing through the exhaust passage. The heat exchange element 8 includes an air supply passage having a multilayer structure made of corrugated paper bonded on a flat paper and an exhaust passage having a multilayer structure made of corrugated paper bonded on the flat paper. A plurality of layers are laminated so that the directions of the two are orthogonal to each other. The supply airflow passing through the supply air passage passes through the supply passage inside the heat exchange element 8, and the exhaust flow passing through the exhaust passage passes through the exhaust passage inside the heat exchange element 8. Therefore, in the heat exchange element 8, heat exchange is performed between the supply airflow passing through the supply air passage and the exhaust flow passing through the exhaust ventilation passage.

  The guide rail 13 is provided on the top plate 9 and the bottom plate 10. The heat exchange element 8 is incorporated along the upper and lower guide rails 13 in the outer box 5 so that it can be taken in and out in the horizontal direction. The maintenance cover 11 is provided on the side plate 80 that faces the end surface of the heat exchange element 8 among the side plates 80 of the exterior box 5. By opening the maintenance cover 11, the heat exchange element 8 can be taken in and out of the outer box 5.

  The outside air port 1 and the exhaust port 2 are provided on one side surface of the exterior box 5. The air supply port 3 and the return air port 4 are provided on the side opposite to the side where the outside air port 1 and the exhaust port 2 are provided, among the side surfaces of the exterior box 5.

  The air supply ventilation path reaches from the outside air port 1 to the air supply port 3 through the air supply passage of the heat exchange element 8 and the air supply fan casing 63. The exhaust ventilation path reaches the exhaust port 2 from the return air port 4 via the exhaust passage of the heat exchange element 8 and the exhaust fan casing 73. The air supply ventilation path and the exhaust ventilation path are configured independently of each other in the heat exchange ventilator 50 so that mixing of the air supply and the exhaust does not occur. The power box 12 is provided inside the outer box 5.

  The indoor air passage portion 53 is an air passage that sends air to the inlet of the exhaust air passage of the total heat exchanging portion 51, and is formed to be positioned behind the humidifying portion 52.

  By operating the exhaust blower 7, the indoor return air A is sucked into the exhaust ventilation path from the return air port 4 through the indoor air path through the duct. The return air A sucked into the exhaust ventilation path passes through the exhaust passage of the heat exchange element 8 and then becomes exhaust B, which is blown out of the room from the exhaust port 2 through the duct.

  By operating the air supply blower 6, the outdoor air C outside the room is sucked into the supply air passage from the outside air port 1 through the duct. The outside air C sucked into the air supply ventilation path passes through the air supply ventilation path of the heat exchange element 8, then passes through the humidifying element 23, becomes the air supply D, and passes through the duct from the air supply port 3 through the duct. Blown out.

  The heat exchange ventilator 50 collects exhaust heat by heat exchange between the air supply airflow and the exhaust airflow at the heat exchange element 8, and sends the exhaust heat together with the airflow indoors. Thereby, it becomes possible to reduce indoor air-conditioning load. Moreover, since the heat exchange ventilator 50 has a humidifying function, it is possible to send air into the room with increased humidity by humidifying the humidifying element 23 through the air after heat exchange.

  FIG. 2 is a perspective view of humidification section 52 in the first embodiment. The humidification part 52 is arrange | positioned adjacent to the exit by the side of the air supply ventilation path of the total heat exchange part 51. FIG. Inside the humidifying section 52, there are a humidified water supply strainer 21 for connecting an external water pipe to the device, an electromagnetic valve 22 for controlling the water supply, a humidifying element 23 for humidifying by passing an air supply air, the humidifying element 23 and the electromagnetic valve 22. A drain pan 24 that receives the leaked water and a water detection sensor 25 that detects water accumulated in the drain pan 24 are incorporated.

  The humidification water supply strainer 21 is arranged in the humidification part 52 so that the water supply port connected to the external water supply pipe projects from the inside to the front surface of the outer box 5. The solenoid valve 22 is connected to the humidified water supply strainer 21 by a pipe 21a. An example of the pipe 21a is a copper pipe. The humidifying elements 23 are arranged side by side in the center of the drain pan 24. Each of the humidifying elements 23 is connected to the electromagnetic valve 22 by a water supply tube 28, and humidifies by supplying moisture to the air supply airflow. An eliminator 27 is disposed on the secondary side of the humidifying element 23 and in front of the air supply port 3 to prevent impurities floating in the air from being supplied into the room. The water detection sensor 25 is a sensor that detects that a set amount of water has accumulated in the drain pan 24. When it detects that a set amount of water has accumulated in the drain pan 24, it sends a signal to the solenoid valve 22, 22 is closed.

  FIG. 3 is a partially enlarged perspective view of the side plate 80 in which the opening 81 for maintenance of the humidifying unit 52 in the first embodiment is formed. A side plate 80 shown in FIG. 3 is the side plate 80 to which the power supply box 12 is attached in FIG. 1 and covers the side of the humidifying unit 52. A maintenance opening 81 is formed in the side plate 80. Through the opening 81, maintenance of the humidifying part 52 and taking in and out of the humidifying part 52 to and from the exterior box 5 can be performed.

  The opening 81 is closed by the maintenance panel 32 that is a lid. FIG. 4 is a front view of maintenance panel 32 in the first embodiment. FIG. 5 is a side view of the maintenance panel 32 and the side plate 80 in a state where the opening 81 is closed in the first embodiment. The maintenance panel 32 has a blocking surface 32a that closes the opening 81 and has a plate shape. A shaft portion 83 is formed on the maintenance panel 32 so as to protrude in a horizontal direction parallel to the side plate 80 in which the opening 81 is formed. The maintenance panel 32 is attached to the side plate 80 in which the opening 81 is formed so as to be rotatable about a rotation shaft 82 that passes through the shaft portion 83.

  Of the outer surface 32b that is the opposite surface of the closing surface 32a of the maintenance panel 32, a portion that overlaps the horizontal plane including the rotation shaft 82 in a state in which the opening 81 is closed is defined as the first reference portion P1, and the first reference portion A distance between P1 and the rotation shaft 82 is defined as a first reference distance H1. Here, the outer surface 32b of the maintenance panel 32 is located above the first reference portion P1 in a state where the maintenance panel 32 closes the opening 81, and the distance from the rotation shaft 82 is the first reference distance H1. The second reference portion P2 is a second reference distance H2 that is larger than the second reference distance H2. In the example shown in FIG. 5, the region above the first reference portion P1 in the outer side surface 32b is all the second reference portion P2 whose distance from the rotation shaft 82 is larger than the first reference distance H1. Become.

  In addition, a portion of the upper end surface 32c of the maintenance panel 32 in the state in which the opening 81 is closed overlaps with the vertical plane including the rotation shaft 82 in the state in which the opening 81 is closed, is defined as a third reference portion P3, and the third reference portion P3. A distance between the part P3 and the rotation shaft 82 is defined as a third reference distance H3. Here, the upper end surface 32c of the maintenance panel 32 is in a region closer to the side plate 80 where the opening 81 is formed than the third reference portion P3 in a state where the maintenance panel 32 closes the opening 81. The fourth reference portion P4 has a fourth reference distance H4 whose distance is larger than the third reference distance H3. In the example shown in FIG. 5, all the regions of the upper end surface 32c that are closer to the side plate 80 in which the opening 81 is formed than the third reference portion P3 have a distance from the rotary shaft 82 that is greater than the third reference distance H3. A large fourth reference portion P4 is obtained. In the present embodiment, the first reference distance H1 and the second reference distance H2 are equal.

  The exterior box 5 is formed with a lid support piece 84 that supports the shaft portion 83 above the opening 81 and allows the maintenance panel 32 to rotate about a rotation shaft 82 that passes through the shaft portion 83. The lid support piece 84 is formed as a part of the holding component 29 attached to the upper portion of the opening 81.

  FIG. 6 is a side view of lid support piece 84 in the first embodiment. The lid support piece 84 is formed with a groove 85 that extends in the vertical direction and into which the shaft portion 83 is fitted. The shaft portion 83 is movable in the groove 85. Thereby, the maintenance panel 32 can be slid up and down.

  The distance between the groove 85 and the side plate 80 in which the opening 81 is formed is closer to the lower end (lower) than to the upper end (upward). Therefore, if the maintenance panel 32 is moved upward, the distance from the side plate 80 having the opening 81 is increased, and if the maintenance panel 32 is moved downward, the distance from the side plate 80 having the opening 81 is formed. The distance becomes smaller.

  As shown in FIG. 6, the distance Q <b> 1 between the side plate 80 on which the opening 81 is formed and the rotary shaft 82 in the state where the shaft portion 83 is located at the upper end of the groove 85 is maintained in the state where the opening 81 is closed. The distance between the portion of the panel 32 above the horizontal plane including the rotation shaft 82 and the rotation shaft 82 of the maintenance panel 32 is greater. Thus, if the shaft portion 83 is positioned at the upper end of the groove 85, the portion above the rotating shaft 82 does not interfere with the side plate 80, so that the maintenance panel 32 can be smoothly opened and closed. Is possible. In addition, the upper end of the groove 85 is bent in a direction away from the side plate 80 in which the opening 81 is formed so that the shaft portion 83 is easily located at the upper end of the groove 85.

  Further, in a state where the shaft portion 83 is positioned at the lower end of the groove 85, the distance Q2 between the side plate 80 in which the opening 81 is formed and the rotation shaft 82 is equal to or greater than the first reference distance H1 and the second reference distance. It becomes less than H2. In particular, in the present embodiment, the distance Q2 is equal to the first reference distance H1. Here, since the first reference distance H1 and the third reference distance H3 are also equal, Q2 = H1 = H3. Note that the equal distance here is a concept including so-called substantially equal distances in which the first reference distance H1 and the third reference distance H3 are slightly smaller than the distance Q2.

  Next, the opening / closing operation of the maintenance panel 32 will be described. FIG. 7 is a diagram illustrating a state in which the opening 81 according to the first embodiment is closed with the maintenance panel 32. In a state where the opening 81 is closed, the maintenance panel 32 is lifted upward by the fixing wire 31 engaged with the lower end of the maintenance panel 32, and the shaft portion 83 is also positioned at the upper end of the groove 85. Therefore, if the engagement by the fixed wire 31 is released, the maintenance panel 32 can be rotated. The heat insulating material 86 attached to the closing surface 32a of the maintenance panel 32 may be configured so that the shaft portion 83 is positioned at the upper end of the groove 85 by fitting inside the opening 81.

  FIG. 8 is a diagram illustrating a state in which the opening 81 is opened by rotating the maintenance panel 32 180 degrees from the state in which the opening 81 is closed in the first embodiment. In the state shown in FIG. 8, since the shaft portion 83 is located at the upper end of the groove 85, the maintenance panel 32 can freely rotate. Therefore, if the hand is released from the maintenance panel 32, the maintenance panel 32 rotates and the opening 81 is blocked.

  FIG. 9 is a diagram showing a state in which maintenance panel 32 in the first embodiment is slid downward from the state shown in FIG. The shaft portion 83 can be positioned at the lower end of the groove 85 by sliding the maintenance panel 32 downward. In this state, since the distance Q2 between the side plate 80 in which the opening 81 is formed and the rotating shaft 82 is equal to the first reference distance H1, the second reference distance H2 larger than the first reference distance H1 is set. Thus, the second reference portion P2 is caught by the side plate 80, and the rotation of the maintenance panel 32 is restricted (see also FIGS. 5 and 6). Therefore, even if the hand is released from the maintenance panel 32, the maintenance panel 32 can be held 180 degrees open. For this reason, the maintenance panel 32 is unlikely to obstruct maintenance work. Further, since the shaft portion 83 is difficult to move above the groove 85 against the gravity, the maintenance panel 32 is prevented from closing unexpectedly.

  FIG. 10 is a diagram illustrating a state in which the opening 81 is opened by rotating the maintenance panel 32 by 90 degrees from the state in which the opening 81 is closed in the first embodiment. FIG. 10 shows a state in which the maintenance panel 32 is slid downward. In this state, since the distance Q2 between the side plate 80 in which the opening 81 is formed and the rotating shaft 82 is equal to the third reference distance H3, a fourth reference distance H4 larger than the third reference distance H3 is set. Thus, the fourth reference portion P4 is caught on the side plate 80, and the rotation of the maintenance panel 32 is restricted (see also FIGS. 5 and 6). Therefore, even when the maintenance panel 32 is released, the maintenance panel 32 can be held in a state of being opened 90 degrees. For this reason, the maintenance panel 32 is unlikely to obstruct maintenance work. Further, since the shaft portion 83 is difficult to move above the groove 85 against the gravity, the maintenance panel 32 is prevented from closing unexpectedly.

  When the maintenance panel 32 is closed from the state shown in FIG. 9 and FIG. 10, the maintenance panel 32 is lifted and the shaft 83 is positioned at the upper end of the groove 85, and then the maintenance panel 32 is rotated.

  Further, since the maintenance panel 32 can be rotated around the horizontally extending rotary shaft 82, that is, the maintenance panel 32 can be opened and closed by rotating up and down, the maintenance panel 32 is engaged with the support protrusion 87 formed on the exterior box 5. Therefore, the maintenance panel 32 does not interfere with a suspension support rod (not shown) extending upward, that is, a suspension support rod on the side of the opening 81. Therefore, the size of the opening 81 can be determined without considering the interference between the suspension support bar and the maintenance panel 32. Therefore, a larger opening 81 can be formed in the side plate 80 of the outer box 5. By forming the larger opening 81, the humidifying part 52 can be easily taken out from the inside of the exterior box 5 through the opening 81. For example, if the humidifying part 52 can be taken out of the exterior box 5 while maintaining the installed posture, water leakage that is likely to occur when the humidifying part 52 is tilted can be prevented.

  In addition, although the structure which can hold | maintain the attitude | position of the maintenance panel 32 was demonstrated as an example when the axial part 83 of the maintenance panel 32 was moved to the lower end of the groove | channel 85, it was not restricted to this. For example, in the process of sliding the shaft portion 83 downward from the upper end of the rotatable groove 85 of the maintenance panel 32, the side plate 80 having the opening 81 formed before the shaft portion 83 reaches the lower end of the groove 85. And the rotation shaft 82 may be configured to be equal to the first reference distance H1 or the third reference distance H2. In this case, before the shaft portion 83 reaches the lower end of the groove 85, the rotation of the maintenance panel 32 is restricted, and the posture of the maintenance panel 32 is maintained.

  Further, in the first embodiment, a configuration is adopted in which the maintenance panel 32 can be held in a state where the maintenance panel 32 is rotated 180 degrees or 90 degrees. However, the posture is maintained only in one of the states. You may comprise so that it can hold | maintain. For example, if the upper end surface 32c of the maintenance panel 32 does not have a portion where the distance from the rotation shaft 82 is larger than the third reference distance H3, the posture is maintained when the maintenance panel 32 is rotated 90 degrees. It is only possible to hold the posture after being rotated 180 degrees (see also FIG. 5). In addition, in the outer surface 32c of the maintenance panel 32, if there is no portion above the horizontal plane including the rotation shaft 82 and the distance from the rotation shaft 82 is greater than the first reference distance H1, maintenance is performed. The posture is not held when the panel 32 is rotated 180 degrees, and only the posture can be held when the panel 32 is rotated 90 degrees.

  If H1 ≦ Q2 <H2 in a state where the shaft 83 is positioned at the lower end of the groove 85, the angle at which the maintenance panel 32 is held is set to an angle other than 90 degrees and 180 degrees. It is also possible to set.

  Further, the configuration of the opening 81 and the maintenance panel 32 shown in the first embodiment is changed to an opening for maintaining the heat exchange element 8 and an opening for maintaining other equipment provided in the exterior box 5. It may be adopted.

  The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

  DESCRIPTION OF SYMBOLS 1 Outside air port, 2 Air exhaust port, 3 Air supply port, 4 Return air port, 5 Outer box (casing), 6 Supply air blower, 7 Exhaust air blower, 8 Heat exchange element, 9 Top plate, 10 Bottom plate, 11 Maintenance cover , 12 Power supply box, 13 Guide rail, 21 Humidification / water supply strainer, 21a Piping, 22 Solenoid valve, 23 Humidification element, 24 Drain pan, 25 Water detection sensor, 27 Eliminator, 28 Water supply tube, 29 Holding parts, 31 Fixing wire, 32 Maintenance Panel (lid), 32a closed surface, 32b outer surface, 32c upper end surface, 50 heat exchange ventilator, 51 total heat exchange unit, 52 humidification unit, 53 indoor air channel unit, 54 partition plate, 61, 71 electric motor, 62, 72 Blade member, 63 Air supply fan casing, 73 Exhaust fan casing, 80 Side plate, 81 Open Mouth, 82 Rotating shaft, 83 Shaft, 84 Lid support piece, 85 Groove, 86 Heat insulating material, 87 Support protrusion

Claims (5)

Exhaust flow from the room to the outside, and a supply air passage that passes through a supply air flow from the outside to the room, and has a box shape having a top plate, a bottom plate, and a side plate that closes between the top plate and the bottom plate A casing formed inside with an exhaust ventilation passage for passing through,
A heat exchange element provided inside the casing for exchanging heat between the air supply flow and the exhaust flow;
A humidifying unit provided in the air supply passage for humidifying the air supply air;
A lid that has a blocking surface that closes the opening for maintenance formed in the side plate, and has a plate shape;
The lid is formed with a shaft portion that projects in parallel and horizontally with the side plate on which the opening is formed,
The casing is formed with a lid support piece that supports the shaft portion above the opening and allows the lid to rotate around a rotation axis that passes through the shaft portion.
The lid support piece is formed with a groove extending in the vertical direction and into which the shaft portion is fitted,
Of the outer surface of the lid that is the opposite surface of the closing surface, a portion that overlaps a horizontal plane including the rotation shaft in a state in which the opening is closed is defined as a first reference portion, and the first reference portion and the rotation shaft Is the first reference distance,
The outer surface of the lid has a second distance that is greater than the first reference distance in a region that is above the first reference portion in a state in which the lid closes the opening. Having a second reference portion as a reference distance;
The groove is closer to the side plate where the opening is formed in the lower part than in the upper part,
In a state where the shaft portion is located above the groove, the distance between the side plate on which the opening is formed and the rotating shaft is higher than the horizontal plane of the lid in the state where the opening is closed. Is greater than the distance between the part and the rotation axis of the lid,
In a state where the shaft portion is located below the groove, a distance between the side plate on which the opening is formed and the rotation shaft is equal to or more than the first reference distance and less than the second reference distance. A heat exchange ventilator characterized by that.   The distance between the side plate in which the opening is formed and the rotating shaft is equal to the first reference distance in a state where the shaft portion is positioned below the groove. The heat exchange ventilator described. Of the upper end surface of the lid in the state of closing the opening, a portion that overlaps the vertical plane including the rotation axis in the state of closing the opening is a third reference portion, and the third reference portion and the rotation shaft Is the third reference distance,
The upper end surface of the lid is located in a region closer to the side plate on which the opening is formed than the third reference portion in a state where the lid closes the opening, and the distance from the rotation axis is the third reference A fourth reference portion that is a fourth reference distance greater than the distance;
The heat exchange ventilator according to claim 1 or 2, wherein the first reference distance is equal to the third reference distance. Exhaust flow from the room to the outside, and a supply air passage that passes through a supply air flow from the outside to the room, and has a box shape having a top plate, a bottom plate, and a side plate that closes between the top plate and the bottom plate A casing formed inside with an exhaust ventilation passage for passing through,
A heat exchange element provided inside the casing for exchanging heat between the air supply flow and the exhaust flow;
A humidifying unit provided in the air supply passage for humidifying the air supply air;
A lid that has a blocking surface that closes the opening for maintenance formed in the side plate, and has a plate shape;
The lid is formed with a shaft portion that projects in parallel and horizontally with the side plate on which the opening is formed,
The casing is formed with a lid support piece that supports the shaft portion above the opening and allows the lid to rotate around a rotation axis that passes through the shaft portion.
The lid support piece is formed with a groove extending in the vertical direction and into which the shaft portion is fitted,
Of the upper end surface of the lid in the state in which the opening is closed, a portion overlapping with the vertical plane including the rotation axis in the state in which the opening is closed is defined as a second reference portion, and the third reference portion and the rotation shaft Is the third reference distance,
The upper end surface of the lid is located in a region closer to the side plate on which the opening is formed than the third reference portion in a state where the lid closes the opening, and the distance from the rotation axis is the third reference A fourth reference portion that is a fourth reference distance greater than the distance;
The groove is closer to the side plate where the opening is formed in the lower part than in the upper part,
In a state where the shaft portion is located above the groove, a distance between the side plate in which the opening is formed and the rotation shaft is a horizontal plane including the rotation shaft in the lid in a state where the opening is closed. Greater than the distance between the upper part and the rotation axis of the lid,
In a state where the shaft portion is positioned below the groove, a distance between the side plate on which the opening is formed and the rotation shaft is equal to or more than the third reference distance and less than the fourth reference distance. A heat exchange ventilator characterized by that.   The distance between the side plate in which the opening is formed and the rotation shaft in a state where the shaft portion is positioned below the groove is equal to the third reference distance. The heat exchange ventilator described.

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