JP3293238B2 - Air conditioning ventilation fan - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simultaneous intake / exhaust type air-conditioning ventilator capable of continuously exchanging heat between room air to be exhausted and outdoor air to be taken in.

[0002]

2. Description of the Related Art A conventional air-conditioning ventilation fan has a structure as disclosed in Japanese Utility Model Publication No. 64-4027, for example. That is, as shown in FIG. 20, a main body 70 is fitted and mounted in a mounting hole formed in a wall partitioning the inside and outside of the room, and a decorative cover 71 mounted on the indoor side of the main body 70. An air blower 73 that sucks in outdoor air and an exhaust blower 72 that exhausts indoor air are incorporated in the main body 70, and a heat exchanger 74 is incorporated in the decorative cover 71. On the discharge side of the intake air blower 73, an air supply passage is formed which is partially open to the interior of the heat exchanger 74 which is constituted by one working fluid passage. An exhaust ventilation passage that opens into the room formed by the other working fluid passage of the exchanger 74 is formed. Both the suction side of the intake blower 73 and the discharge side of the exhaust blower 72 are connected to an intake port 75 and an exhaust port 76 formed at the outdoor end of the main body 70, respectively.

[0003] The air-conditioning ventilator of the above configuration can supply fresh outdoor air to the room through the heat exchanger 74 and simultaneously exhaust polluted room air to the outside through the heat exchanger 74. That is, heat exchange is continuously performed between the exhaust air flow and the intake air flow, and the ventilation can be performed by the intake and exhaust air with little fluctuation in the room temperature.

[0004]

In the conventional air-conditioning ventilator described above, an intake port 75 and an exhaust port 76 are opened at the outdoor end of the main body 70, and these are installed outdoors (in most cases, outdoors). Since it is necessary to face, it can be installed only in a room having an outer wall, and cannot be installed in a room without an outer wall. In recent years, rooms without outer walls have tended to increase with housing consolidation and building. Also,
Although it has a structure for receiving the drain generated in the heat exchanger 74, the drain cannot be drained by itself, so there is a disadvantage that the drain may drop into the room. In some cases, the remaining drain may drop on the worker.

Furthermore, there is a problem that air leakage and drain leakage easily occur from a gap between the holding portion for holding the heat exchanger 74 and the air passage, and it is actually difficult to perform the construction, and the size of the indoor space is large.

The present invention has been made to solve the above-mentioned conventional problems. The first object of the present invention is to eliminate restrictions on the presence or absence of an outer wall when installing an air-conditioning ventilation fan. The third purpose is to facilitate drain autonomous treatment and the maintenance of the heat exchanger. The third is to prevent drain water from dropping when removing the heat exchanger. Fifth is to prevent leakage and drain leakage, fifth is to simplify construction and facilitate installation and removal, sixth is to increase the degree of freedom of drain piping, and seventh is small size Is to measure

[0007]

An intake air outlet and an exhaust air inlet are located on a lower surface of a main body casing, and a connection position between an exhaust ventilation passage connected to the exhaust air inlet and the heat exchanger is located at an exhaust connection port. The working fluid passage of the heat exchanger, which is above the connection position between the connected exhaust ventilation path and the heat exchanger and passes the exhaust flow, is disposed so as to have a downward gradient toward the flow direction of the exhaust flow, and the exhaust A drain plate is provided below the working fluid passage through which the flow passes.

In addition, a heat exchange unit is provided with a holding unit for holding the heat exchanger, a support unit for supporting the drain plate, and an air intake passage and an exhaust air passage near the heat exchanger. A container and a drain plate are incorporated, and an outer step is provided in the chamber structure on the side where the heat exchanger is mounted and on the side where the drain plate is mounted, so that the drain plate is received outside the step.

[0009] Furthermore, there is an intake / exhaust frame provided with a suction side duct for sucking outdoor air, a discharge side duct for exhausting room air, and an external drainage connection part, and an intake connection communicated with the suction side duct. A main body casing having a port, an exhaust connection port communicating with the discharge-side duct, and a drain pipe communicating with the external drain connection section through a drain connection pipe having a flexible structure to drain the drain of the drain plate. Things.

[0010] Furthermore, the external drainage connection portion connected to the drain pan via the drainage pipe comprises a rotatable L-shaped pipe and fixing means for fixing the L-shaped pipe.

Further, an intake blower and an exhaust blower are provided,
The scroll outlet is constituted by a sirocco blower that is connected by a guide portion that continues at a gentle gradient starting from the blade rotation space.

[0012]

The intake air outlet and the exhaust air inlet are located on the lower surface of the main body casing, and the exhaust air passage connected to the exhaust air inlet and the heat exchanger are connected to the exhaust air passage connected to the exhaust air inlet. The working fluid passage of the heat exchanger through which the exhaust gas flows is disposed so as to have a downward slope toward the flow direction of the exhaust gas, and the working fluid passage through which the exhaust gas flows. Since the drain pan is provided below the ceiling, it can be mounted using the ceiling of the room regardless of whether it faces the outer wall, and the drain generated in the heat exchanger is also drained to the drain pan.

[0013] Further, a heat exchange unit is provided with a holding unit for holding the heat exchanger, a support unit for supporting the drain plate, and an intake air passage and an exhaust air passage near the heat exchanger. The heat sink and the drain plate are installed in the chamber structure, and an outer step is provided on the side where the heat exchanger is mounted and the side where the drain plate is mounted, and the drain plate is received outside the step, causing air leakage and drain leakage. A gap can be prevented from being formed, and the step makes it easier to receive the drain in the drain plate.

Further, the drain plate has a drain connection port, and is connected to a suction connection port to take in outdoor air through a duct. A suction side duct connection port is connected to an exhaust connection port to discharge room air through the duct. Side duct connection,
Since it has an intake / exhaust frame equipped with a drain connection port and an external drain connection connected via a drain connection pipe having a flexible structure, only the intake / exhaust frame is attached first, and the The casing can be attached.

Further, an external drainage connection part for guiding the drain to the outside and connecting to the drainage pipe includes a rotatable L-shaped pipe,
Since the L-shaped pipe is rotatably pressed and held by the fixing means for fixing the pipe, the degree of freedom in the connection direction of the external drain pipe is increased without using expensive parts.

Furthermore, an intake blower and an exhaust blower are
Since the scroll outlet is constituted by a sirocco blower that is connected by a guide portion that continues at a gentle gradient starting from the blade rotation space, the blowing position can be changed while suppressing pressure loss.

[0017]

[Embodiment 1] FIG. 1 is a longitudinal sectional view of an air-conditioning ventilation fan showing an embodiment of the present invention, and FIG. 2 is an overall perspective view of the air-conditioning ventilation fan.

This air-conditioning ventilation fan comprises a main body mounted in a space above the ceiling and a decorative panel 1 mounted on the lower surface of the main body along the ceiling surface C. The main body has a configuration in which a ventilation function component is incorporated in a box-shaped main body casing 2 having an open lower surface. That is, an intake air blower 3 that sucks in outdoor air and an exhaust air blower 4 that exhausts indoor air are incorporated in the main body casing 2, and a part of the discharge side of the intake air blower 3 is provided by one working fluid passage of the heat exchanger 5. An intake air passage 6 is provided, and an exhaust air passage 7 partially provided on the discharge side of the exhaust blower 4 is constituted by the other working fluid passage of the heat exchanger 5. The outlet end of the intake ventilation passage 6 communicates with the interior through an intake outlet 8 of the decorative panel 1, and the inlet end of the exhaust ventilation passage 7 connects to the decorative panel 1.
To an exhaust air inlet 9 formed side by side with an intake air outlet 8 of the air conditioner. The working fluid passage through which the exhaust flow of the heat exchanger 5 passes is formed so as to have a downward slope toward the flow direction of the exhaust flow, and a drain plate 10 is provided below the lower inclined end with a holding portion 11 of the heat exchanger 5. It is also installed. Intake blower 3
The suction side and the discharge side of the exhaust blower 4 are both arranged side by side on the rear side of the main body casing 2 as an intake connection port 12 and an exhaust connection port 13 that can be connected to the duct.
In FIG. 1, the arrow A indicates the flow of the intake flow, and the arrow B indicates the flow of the exhaust flow. In addition, the intake air passage 6 and the exhaust air passage 7 are divided by the partition member 14 and the like independently over the entire path.

The drain pan 10 has a cylindrical drain pipe connection port 15 and a shaft portion 15a provided at both ends of one side end so as to protrude on the same axis.
The main body casing 2 is pivotally supported by the shaft portion 15a and the drain pipe connection port 15 so as to be rotatable in a vertical direction. However, normally, the drainage pipe connection port 15 is held by a stopper or the like in a state of having a slight slope with a downward inclined end. A drain pipe 16 is connected to the drain pipe connection port 15 and communicates with a predetermined drain place. In addition, the intake connection port 12 and the exhaust connection port 13
The ducts are connected to each other and communicated to the outside.

The ventilation function of the air-conditioning ventilation fan having the above configuration is the same as that of the above-described conventional one. The feature of this air-conditioning ventilation fan is that a duct can be connected to each of the intake connection port 12 and the exhaust connection port 13 and each can be connected to the outside by the duct, so that the ceiling of the room can be connected regardless of whether the room faces the outer wall. The drain generated in the heat exchanger 5 is also drained from the drain plate 10 to a place set by the drain pipe 16, so that there is no inconvenience such as drain dripping into the room. In particular, during maintenance of the heat exchanger 5, the drain plate 10 located below the heat exchanger 5 is connected to the drain pipe connection port 15 and the shaft 15.
Since it can be rotated to a position where it does not get in the way around the shaft a, maintenance of the heat exchanger 5 can be easily performed without removing the drain plate 10. In the mounted state, the ventilation function component is incorporated in the main body casing 2, and only the decorative panel 1 is presented on the ceiling surface C side.

Embodiment 2 FIG. 3 and 4 and FIGS. 5 and 6 show another embodiment of the drain pan 10, respectively. The configuration other than the drain plate 10 is the same as that of the first embodiment described above, and the description thereof will be omitted by attaching the common reference numerals to the drawings.

The drain plate 10 is provided with a local ceiling surface 17 at an upper portion on the side opposite to the shaft portion 15a serving as the rotation axis of the drain plate 10 and the drain pipe connection port 15. Thereby, as shown in FIG. 4, the drain plate 10 is connected to the shaft portion 15a and the drain pipe connection port 1 for maintenance of the heat exchanger 5, and the like.
5, the drain remaining on the drain pan 10 is removed from the side, bottom, and ceiling surfaces 1 of the drain pan 10.
Since the water flows down and is stored in the container-like portion 18 constituted by the step 7, the inconvenience of the operator dropping the drain is eliminated, and the work such as maintenance is facilitated.

In particular, as shown in FIGS.
If guide projections 19 are provided in the form of isosceles triangles inward from the middle portions on both sides, water flows during normal drainage as shown by the arrow in FIG. When the drain plate 10 is rotated downward at the shaft portion 15a and the drain pipe connection port 15, the drain is drawn from the center by the guide projection 19 as shown by the arrow C in FIG. Therefore, it is possible to more reliably prevent the dripping of the drain.

Embodiment 3 FIG. FIG. 7 is a vertical sectional side view of an air-conditioning ventilation fan showing an embodiment of the present invention, and FIGS. 8 to 10 are an explanatory view, a partial perspective view and a partial cross-sectional view when the air-conditioning ventilation fan is mounted.

Although this air-conditioning ventilation fan is shown in the first embodiment, the heat exchanger 5 and the drain plate 10 are connected to the intake air passage 6 and the exhaust air passage 7 of the heat exchanger 5 and the holding portion 11 of the heat exchanger 5.
Into the integrally formed chamber structure 20,
A heat exchange system and a drain system are configured by mounting the chamber structure 20 in the main body casing 2.
The suction side of the intake air blower 3 and the discharge side of the exhaust air blower 4 are both provided as an intake connection port 12 and an exhaust connection port 13 which can be connected to the duct, respectively, on an intake / exhaust frame 21 formed separately from the main body casing 2. The main casing 2 is joined to the intake / exhaust frame 21 to form a series of ventilation passages.

As shown in FIGS. 9 and 10, the chamber structure 20 is formed as a lower open box that can be inserted into and fixed to the main body casing 2 from below. A mounting portion is formed. The heat exchanger mounting portion is formed with a holding portion 11 for holding the opposing ridges of the heat exchanger 5 without forming a gap. The other ridges located above and below the heat exchanger 5 are shown in FIG.
A swelling portion 22 swelling at the inlet / outlet side of the working fluid passage through which the exhaust gas flows as shown by 0 is provided. The drain mounting portion is formed with a stepped portion 23 wider front and rear than the heat exchanger mounting portion, and a shaft supporting portion 24 for supporting the shaft portion 15a of the drain plate 10 and the drain pipe connection port 15 is formed at opposing positions. I have. The drain plate 10 pivotally supported by the pivot support portion 24 receives the lower bulged portion 22 on the lower side of the heat exchanger 5 incorporated in the chamber structure 20 as shown in FIG. The upper surface of the heat exchanger 23 is configured to receive the flat area of the heat exchanger mounting portion below. Therefore, the drain from the heat exchanger mounting portion side is all drain pan 10 as shown in FIG.
Will be accepted. The shaft support 24 on the drain pipe connection port 15 side is configured such that a lower open U-groove 25 and an upper open U-groove 26 are adjacent to each other inside and outside at intervals.

The intake / exhaust frame 21 is provided with an external drainage connection portion 27 for draining drainage to the outside together with the intake connection port 12 and the exhaust connection port 13. This intake / exhaust frame 21
Has a flange 28 at a lower portion and an engagement structure with the main body casing 2 at an upper portion, and can be independently mounted in a mounting hole formed in a ceiling surface C as shown in FIG. That is,
First, the intake / exhaust frame 21 is independently mounted in a vertical state in the space above the ceiling via the mounting hole of the ceiling surface C as shown in FIG. 8, and then the main body casing 2 incorporating the chamber structure 20 is installed. To the main body casing 2 and the previously mounted intake / exhaust frame 21 are joined. The drain connection port 15 of the drain plate 10 and the external drain connection 27 of the intake / exhaust frame 21 are connected by a drain connection pipe 29.

The air-conditioning ventilation fan of this embodiment basically performs the same function as that shown in the first embodiment, but in particular, the holding portion 11 of the heat exchanger 5 and the holding of the drain plate 10 by the chamber structure 20. Since the part and the air passage of the part are integrally formed, it is possible to prevent air leakage, drain leakage, and the like, and furthermore, the intake connection port 12, the exhaust connection port 13 that needs to be connected outside the main body, and the outside. Drainage connection 27
Are assembled separately, so that they can be attached separately as separate bodies, so that the workability is good and the difficulty of attachment can be reduced.

Embodiment 4 FIG. This embodiment is different from the third embodiment in that the external drain connection 2 of the drain plate 10 and the intake / exhaust frame 21 in the air-conditioning ventilation fan shown in the third embodiment.
7 relates to the connection structure. That is, FIG.
As shown in FIG. 3, a bottom 31 facing the inner side drain port 30 of the drain plate 10 is formed with a semicircular concave portion 31, and a ring-shaped elastic seal member 32 is attached to an edge of the inner side drain port 30. I have. As shown in FIG. 12, the drain connection pipe 29 for communicating between the drain plate 10 and the intake / exhaust frame 21 and leading the drain of the drain plate 10 to the outside is provided in the concave portion 3 of the drain plate 10.
A large-diameter portion 33 having an outer diameter that fits into a small-diameter conduit portion having a flexible structure that can be inserted into the drain pipe connection port 15 of the drain plate 10 is connected. The length of the large diameter portion 33 in the center line direction is set so as to fit into the concave portion 31 in a state where the elastic seal member 32 is compressed.

According to the connection structure of the drain pan 10 having the above structure, the drain connection pipe 29 is inserted from the inside of the drain pan 10 to the drain pipe connection port 15 with the conduit first, and the large-diameter portion 33 is elastically sealed. If it is pressed into the recess 32 and fitted into the recess 31 in a compressed state, the drain connection pipe 29 can be easily, easily and stably mounted. That is, the compressed elastic restoring force of the elastic seal member 32 acts in a direction to push back the large-diameter portion 33, and the end of the large-diameter portion 33 hits the end face of the concave portion 31 in a biased state and is locked. When it is necessary to remove the drain connection pipe 29 for maintenance of the heat exchanger 5 or the like, the elastic seal member 32 can be easily removed by compressing and extracting it.

Embodiment 5 FIG. This embodiment relates to the structure of the external drain connection 27 of the intake / exhaust frame 21 in the air-conditioning ventilation fan shown in the third embodiment. That is, as shown in FIGS. 14 to 17, an outlet 34 through which the end of the drain connection pipe 29 passes is opened in the intake / exhaust frame 21, and mounting portions 35, 36 are formed on the outside left and right of the outlet 34 so as to face each other. Have been. One mounting portion 35 is formed by cutting and raising, and has an engaging portion 37 that is opened inward. The other mounting portion 36 is formed as a substantially trapezoidal bulging portion, and is provided with screw holes 38 above and below. The external drainage connection portion 27 is constituted by an L-shaped tube 40 having a flange 39 at a base portion and a substantially C-shaped fixing bracket 41. The flange 39 of the L-shaped tube 40 has an elastic sealing material 42 inside thereof.
Is adhered, and can be brought into close contact with the outer edge of the outlet 34. The fixing bracket 41 is an L-shaped tube 40.
A metal plate comprising: a notch 43 into which the mounting portion 35 is fitted; a latching portion to be inserted into the engaging portion 37 of the one mounting portion 35; It is.

The L-shaped tube 40 in which the elastic sealing material 42 provided on the flange 39 is joined to the rim of the outlet 34 is pressed by the notch 43 of the fixture 41 as shown in FIG.
Inserting one of the mounting portions 35 of the latching portion of the fixing bracket 41 into the engaging portion 37 and screws 44 and
The elastic seal member 42 is attached in a compressed state by the tightening by 45. The drain pipe 16 to be connected to the outside is connected to the L-shaped pipe 40.

According to the external drain connection portion 27 of this embodiment, as shown in FIGS. 14 and 15, the L-shaped pipe 40 can be rotated and attached in any direction, and the drain gradient of the drain pipe 16 can be freely set. Can be set to

Embodiment 6 FIG. This embodiment relates to the intake blower 3 and the exhaust blower 4 in the air-conditioning ventilation fan shown in the first and third embodiments. That is, as shown in FIGS. 18 and 19, the intake blower 3 and the exhaust blower 4 are each constituted by a scroll 46, a sirocco blade 47, and a drive motor 48, which are formed as an integrally molded product made of resin. The suction port 49 of the scroll 46 communicates with the blade rotation space 50 from the center line direction, and the outlet 51 is formed at a predetermined blowing position from the blade rotation space 50 by a scroll-shaped guide portion 52 having a gentle gradient. Thus, the blowing position can be changed while suppressing the pressure loss, so that the apparatus can be downsized without deteriorating its performance.

[0035]

The intake air outlet and the exhaust air inlet are located on the lower surface of the main body casing, and the connection position between the exhaust ventilation passage connected to the exhaust air inlet and the heat exchanger is connected to the exhaust air outlet. Above the connecting position between the ventilation path and the heat exchanger,
The working fluid passage of the heat exchanger through which the exhaust flow passes is disposed so as to have a downward gradient in the flow direction of the exhaust flow, and a drain plate is provided below the working fluid passage through which the exhaust flow passes, so that it faces the outer wall. It can be installed using the ceiling of the room irrespective of whether it is facing or not, the restrictions on installation are eliminated, and the drain generated in the heat exchanger is drained to the drain plate,
Dripping into the room is prevented.

A heat exchange unit is provided with a holding unit for holding the heat exchanger, a support unit for supporting the drain plate, and an intake air passage and an exhaust air passage near the heat exchanger. The heat sink and the drain plate are incorporated, and the chamber structure is provided with an outer step on the heat exchanger mounting side and the drain plate mounting side, so that the drain plate is received outside the step to prevent air leakage and drain leakage The drain can be reliably received in the drain plate by the step.

Further, there is an intake / exhaust frame provided with a suction side duct for sucking outdoor air, a discharge side duct for exhausting room air, and an external drainage connection, and an intake connection communicated with the suction side duct. A main body casing having a port, an exhaust connection port communicating with the discharge-side duct, and a drain pipe communicating with the external drain connection section through a drain connection pipe having a flexible structure to drain the drain of the drain plate. Therefore, only the intake / exhaust frame is attached first, and after the necessary construction such as duct connection and drainage piping is completed, the main body casing can be attached, so that the difficulty of the attachment work is reduced and the workability is improved.

Further, since the external drain connection portion connected to the drain plate via the drain pipe is composed of a rotatable L-shaped pipe and fixing means for fixing the L-shaped pipe, the L-shaped pipe is rotated. Since it is pressed and held as much as possible, the degree of freedom in the connection direction of the external drainage pipe increases without using expensive components, and the drainage direction can be easily adapted to the characteristics of the installation location. s

Furthermore, an intake blower and an exhaust blower are
The sirocco blower connects the scroll outlet with a guide that continues at a gentle gradient starting from the blade rotation space. Will be possible.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of an air-conditioning ventilation fan showing an embodiment of the present invention.

FIG. 2 is a perspective view of an air-conditioning ventilation fan showing an embodiment of the present invention.

FIG. 3 is a perspective view of a drain plate according to another embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of an air-conditioning ventilation fan showing another embodiment of the present invention.

FIG. 5 is a perspective view of a drain plate according to another embodiment of the present invention.

FIG. 6 is a plan view of a drain plate according to another embodiment of the present invention.

FIG. 7 is a vertical sectional side view of an air-conditioning ventilation fan showing another embodiment of the present invention.

FIG. 8 is an explanatory view when the air-conditioning ventilation fan of FIG. 7 is attached.

FIG. 9 is an exploded perspective view of a chamber structure showing another embodiment of the present invention.

FIG. 10 is a longitudinal sectional side view of a chamber structure showing another embodiment of the present invention.

FIG. 11 is a longitudinal sectional front view of a chamber structure showing another embodiment of the present invention.

FIG. 12 is an enlarged exploded perspective view of a drain plate portion of an air-conditioning ventilation fan according to another embodiment of the present invention.

FIG. 13 is a partially enlarged perspective view of a drain plate showing another embodiment of the present invention.

FIG. 14 is a rear view of an air-conditioning ventilation fan showing another embodiment of the present invention.

FIG. 15 is a rear view of an air-conditioning ventilation fan showing another embodiment of the present invention.

16 is an enlarged exploded perspective view of an arrow A portion in FIG.

FIG. 17 is an enlarged cross-sectional view taken along an arrow A in FIG.

FIG. 18 is a perspective view showing a scroll of a blower of an air-conditioning ventilation fan showing another embodiment of the present invention.

FIG. 19 is a cross-sectional view illustrating a configuration of a blower of an air-conditioning ventilation fan according to another embodiment of the present invention.

FIG. 20 is a longitudinal sectional view showing a configuration of a conventional air-conditioning ventilation fan.

[Explanation of symbols]

 2 Body casing 3 Intake blower 4 Exhaust blower 5 Heat exchanger 6 Intake ventilation passage 7 Exhaust ventilation passage 10 Drain plate 11 Holder 12 Intake connection port 13 Exhaust connection port 15 Drain pipe connection port 16 Drain pipe 17 Ceiling surface 18 Container part Reference Signs List 20 chamber structure 21 intake / exhaust frame 23 stepped portion 27 external drain connection portion 29 drain connection tube 31 concave portion 32 elastic seal member 33 large diameter portion 40 L-shaped tube 41 fixing bracket 46 scroll 51 air outlet 52 guide portion

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-140737 (JP, A) JP-A-58-96931 (JP, A) JP-A-3-251634 (JP, A) 46734 (JP, U) Fully open sho 56-130628 (JP, U) Real open sho 50-29439 (JP, U) Full open 4-23946 (JP, U) Full open 4-39626 (JP, U) 62-130334 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 7/08 101

Claims (5)

(57) [Claims] 1. An air blower for sucking outdoor air from an air intake port and an exhaust air blower for exhausting room air from an air exhaust port are incorporated in a main body casing, and a part of the heat exchanger is provided on a discharge side of the air blower. An air passage provided by one of the working fluid passages is provided, and the outdoor air is blown into the room from an intake air outlet, and a part of the other working fluid passage of the heat exchanger is provided on a discharge side of the exhaust blower. An air-conditioning ventilator provided with an exhaust ventilation passage configured to draw in the room air in the room from an exhaust suction port, wherein the intake air outlet and the exhaust air suction port are located on a lower surface of the main body casing, and the exhaust air suction port is provided. The connection position between the exhaust ventilation passage connected to the heat exchanger and the heat exchanger is higher than the connection position between the exhaust ventilation passage connected to the exhaust connection port and the heat exchanger, and Exchanger working fluid An air-conditioning ventilation fan, wherein a passage is disposed so as to have a downward slope in a flow direction of the exhaust flow, and a drain plate is provided below a working fluid passage through which the exhaust flow passes. 2. A chamber structure comprising a holding portion for holding a heat exchanger, a supporting portion for supporting a drain plate, and an intake air passage and an exhaust air passage near the heat exchanger by integral molding.
The heat exchanger and the drain plate are incorporated, and an outer step is provided on the heat exchanger mounting side and the drain plate mounting side in the chamber structure, and the drain plate is received outside the step. The air-conditioning ventilation fan according to claim 1, wherein 3. An intake / exhaust frame including an intake duct for taking in outdoor air, a discharge duct for exhausting indoor air, and an external drain connection, and intake air being communicated with the intake duct. A body having a connection port, an exhaust connection port communicating with the discharge side duct, and a drain pipe communicating with the external drain connection section through a drain connection pipe having a flexible structure to drain the drain of the drain plate. The air-conditioning ventilator according to claim 1, further comprising a casing. 4. An external drainage connection portion connected to the drain pan via a drainage pipe comprises a rotatable L-shaped pipe and fixing means for fixing the L-shaped pipe. The air-conditioning ventilation fan according to any one of claims 1 to 3. 5. A sirocco blower in which an intake blower and an exhaust blower are connected by a guide portion which connects a blow-off port of a scroll with a gentle gradient starting from a blade rotation space. The air-conditioning ventilation fan according to any of the above.