JP2003293985A - Suction and exhaust fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a suction and exhaust fan having the small number of part items, formed in a simple structure to downsized. <P>SOLUTION: This suction and exhaust fan 1 comprises: a case 4 having an intake air suction port 44 for taking suction air from the outside 3 of a room, a suction air exhaust port 46 for exhausting suction air into the room 6, an exhaust suction port for taking exhaust gas from the inside of the room 6, and an exhaust discharge port 45 for discharging exhaust to the outside 3 of the room; and an impeller 5 having an inner tube part 50 for dividing, in the case 4, a suction chamber 70 communicating with the suction air suction port 44 and the suction air exhaust port 46 into an inner peripheral side and an exhaust chamber 71 communicating with the exhaust suction port and the exhaust discharge port 45 into an outer peripheral side, and a fan blade 51 radially extended from the inner tube part 50 to generate swirl air flow in the exhaust chamber 71. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake / exhaust fan capable of simultaneously performing intake and exhaust.

[0002]

2. Description of the Related Art As an intake / exhaust fan of this type, for example, there is an intake / exhaust fan described in Japanese Patent Laid-Open No. 2001-133005. FIG. 7 shows a sectional view of the intake / exhaust fan described in the publication. As shown in the figure, the intake / exhaust fan 100 is
A case 101 and an impeller 102 are provided. Case 10
1 is arranged so as to project upward from the ceiling 103.
The case 101 has an intake port 10 that opens to the outside 104.
5 and the exhaust outlet 106. Also, the case 101
Has an intake / exhaust port 108 and an exhaust / intake port 109 that open into the room 107. The impeller 102 is arranged substantially in the center of the case 101. The impeller 102 is a partition wall 1.
It is separated by two in the axial direction, that is, in the vertical direction. An intake chamber 111 is defined above the partition wall 110. The intake chamber 111 communicates with the intake inlet 105 on the upstream side. The intake chamber 111 communicates with the intake / exhaust port 108 on the downstream side. On the other hand, an exhaust chamber 112 is defined below the partition wall 110. The exhaust chamber 112 communicates with the exhaust suction port 109 on the upstream side. Further, the exhaust chamber 112 communicates with the exhaust outlet 106 on the downstream side.

The air flow of the intake air flows in the order of the outside 104, the intake inlet 105, the intake chamber 111, the intake outlet 108, and the room 107, as shown by the dotted arrow in the figure. On the other hand, the air flow of the exhaust gas flows in the room 107 →
Exhaust inlet 109 → Exhaust chamber 112 → Exhaust outlet 106 →
It flows in the order of the outside 104.

[0004]

However, the intake / exhaust fan 100 described in the publication has a large number of parts and has a complicated structure. Also, the number of assembly steps is large. Therefore, the intake / exhaust fan 100 has a high manufacturing cost. Further, according to the intake / exhaust fan 100, the intake chamber 111 and the exhaust chamber 112 are arranged in the axial direction of the impeller 102. For this reason,
The shaft length of the impeller 102 is long. Therefore, impeller 1
The case 101 for storing 02 also becomes large.

The intake / exhaust fan of the present invention has been completed in view of the above problems. Therefore, an object of the present invention is to provide an intake / exhaust fan that has a small number of parts, has a simple structure, and can be downsized.

[0006]

(1) In order to solve the above problems, an intake / exhaust fan according to the present invention has an intake air intake port for taking in intake air from the outside, an intake air exhaust port for exhausting the intake air into a room, and an indoor room. A case in which an exhaust air intake port for taking in exhaust gas from the exhaust gas and an exhaust gas exhaust port for exhausting the exhaust gas to the outside are provided, and an inner circumference of an intake chamber communicating with the intake air intake port and the intake air exhaust port in the case. On the outer side, an inner cylinder section for partitioning the exhaust chamber communicating with the exhaust suction port and the exhaust discharge port on the outer peripheral side, and a fan radially extending from the inner cylinder section for generating a swirling airflow in the exhaust chamber And an impeller having a blade.

That is, the intake / exhaust fan of the present invention has the intake chamber and the exhaust chamber juxtaposed not in the axial direction but in the radial direction. When the intake chamber and the exhaust chamber are arranged side by side in the radial direction, the axial length of the impeller is shortened. Therefore, the case can be downsized. Therefore, the intake / exhaust fan of the present invention can be easily downsized. Further, the intake and exhaust fan of the present invention,
The number of parts is small and the structure is simple. Also, the number of assembly steps is small. Therefore, the manufacturing cost is low.

(2) Preferably, in the configuration of (1) above, further, an intake processing means for processing intake air is preferably provided on the downstream side of the intake intake port. According to this configuration, for example, cleaning, deodorization, aroma addition, dehumidification, heating, and other processing are intensively performed before the intake air flows into the room.
Can be applied to the intake. Therefore, according to this configuration, the interior of the room can be efficiently made comfortable.

(3) Preferably, in the above configuration (1), an intake flow generating means for forcibly creating an intake flow is further provided downstream of the intake intake port. According to this structure, the flow velocity of the intake air is increased. That is, the flow rate per unit time becomes large. Further, as the intake air flow rate increases, the exhaust gas flow rate also increases. Therefore, according to this configuration, the intake / exhaust amount can be increased.

(4) Preferably, in the above configuration (1), the fan blade is a passage fan blade which has an intake passage communicating with the intake chamber and the intake / exhaust port and extending in the radial direction. It is better to have a structure. That is, this configuration effectively uses the inside of the fan blade, which was originally a dead space, as an intake passage. According to this configuration, it is possible to efficiently secure the flow path of the intake air. Further, since the intake passages can be arranged by the number of fan blades, a relatively wide flow passage cross-sectional area can be secured. Further, the weight of the fan blade can be reduced by the amount of the intake passage. Reducing the weight of the fan blade, which is a rotating member, extends the life of the intake and exhaust fans.

(5) Preferably, in the above configuration (4), the impeller further has an outer cylinder portion in which the passage fan blade is fixed to the inner peripheral side. That is, in this configuration, the outer cylinder portion is further arranged on the impeller. According to this configuration, the fan blade is
In the radial direction, it is installed between the inner tubular portion and the outer tubular portion. Therefore, the fan blade can be held more firmly.

(6) In the configuration of (4), preferably, the case has a single intake / exhaust port, and collects intake air from the intake passage and guides it to the intake / exhaust port. It is better to have a structure with. That is, in this configuration, the intake guide portion that collects intake air that radially flows in the radial direction and guides it to a single intake / exhaust port is arranged in the case. According to this configuration, at a desired spatial position in the room,
The intake air can be exhausted intensively.

(7) Preferably, in the above configuration (4), the passage fan blade is a high heat transfer fan blade formed of a material having a high heat transfer coefficient. The intake passage is arranged inside the high heat transfer fan blade. In addition, the high heat transfer fan blade is
It is located in the exhaust chamber. Therefore, the intake passage and the exhaust chamber are adjacent to each other with the wall portion of the high heat transfer fan blade interposed therebetween. Here, the wall portion of the high heat transfer fan blade is formed of a material having a high heat transfer coefficient. Therefore,
With this configuration, heat can be quickly exchanged between the intake air in the intake passage and the exhaust air in the exhaust chamber. Therefore, when the difference between the temperature of the intake air and the temperature of the exhaust gas, that is, the room temperature is large, the intake air can be taken into the room after the temperature of the intake air is brought close to the room temperature in advance. Therefore, according to this configuration, it is possible to suppress fluctuations in room temperature.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the intake and exhaust fan of the present invention will be described below.

(1) First Embodiment First, the structure of the intake and exhaust fan of this embodiment will be described. FIG. 1 shows a perspective view of the intake / exhaust fan of this embodiment.
Further, FIG. 2 shows a cross-sectional view taken along the line II of FIG. As shown in the figure, the intake / exhaust fan 1 is arranged substantially at the center of a vehicle ceiling 2 (indicated by a chain double-dashed line in FIG. 1). In addition, in FIG. 1, members protruding to the outside 3 of the vehicle are indicated by alternate long and short dash lines.

The intake / exhaust fan 1 includes a case 4 and an impeller 5.
With. Of these, the case 4 includes a cup portion 40, an intake suction cylinder portion 42, and an exhaust discharge cylinder portion 43. The cup portion 40 is made of resin and has a cup shape having an opening at the top. The cup portion 40 is arranged on the room 6 side of the ceiling 2. Specifically, the cup portion 40 is fixed to the lower surface of the ceiling 2 with the opening just turned down. An intake / outlet port 46 is provided on the side peripheral wall of the cup portion 40. The intake / exhaust ports 46 have a slit shape that is long in the axial direction, that is, the vertical direction, and are arranged on the entire circumference of the side peripheral wall. An exhaust inlet 47 is opened on the bottom wall of the cup portion 40. The exhaust suction port 47 has a slit shape that is long in the radial direction and is radially arranged on the entire surface of the bottom wall. A recess 400 is formed in the center of the bottom wall of the cup 40. A motor 401 is arranged in the recess 400.

The intake / intake cylinder 42 is made of resin and has a cylindrical shape bent into an L shape. Intake / intake cylinder 42
Penetrates the ceiling 2 from the bottom to the top and projects to the outside 3 from almost the center of the cup portion 40. The intake / intake cylinder portion 42 is bent at approximately 90 ° on the outside 3 and extends forward of the vehicle. An intake suction port 44 is opened at the front end of the intake suction cylinder portion 42. Intake port 44
Has a slit shape. Further, the intake / intake cylinder 42
An air cleaning filter 48 is arranged on the inner peripheral side, downstream of the intake air intake port 44. Air purifying filter 48
Is made of non-woven fabric and has a tablet shape. The air cleaning filter 48 is included in the intake processing means of the present invention.

The exhaust / exhaust tube portion 43 is made of resin and has a rectangular tube shape curved in an arc shape. The exhaust / exhaust cylinder 43 is
From the outer peripheral portion of the cup portion 40, the ceiling 2 is penetrated from the bottom to the top and is projected to the outside 3. The exhaust gas discharge tube portion 43 is curved on the outside 3 and extends rearward of the vehicle. An exhaust outlet 45 is provided at the rear end of the exhaust outlet 43.
Has been established.

The impeller 5 comprises an inner cylinder portion 50, a high heat transfer fan blade 51 and an outer cylinder portion 52. Impeller 5
It is stored in the cup portion 40. The inner tubular portion 50 is made of an aluminum alloy and has a cup shape having an opening at the top. The inner cylinder portion 50 is arranged above the motor 401. The bottom wall of the inner tubular portion 50 is fixed to the rotary shaft 402 of the motor 401. Further, the opening end of the inner tubular portion 50 is annularly mounted on the outer peripheral side of the lower end of the opening of the intake / intake tubular portion 42. That is, the inner cylinder portion 51 is rotatably arranged together with the rotation shaft 402. The inner cylindrical portion 50 divides the inside of the cup portion 40 into an inner peripheral side and an outer peripheral side.
An intake chamber 70 is defined on the inner peripheral side of the inner tubular portion 50. On the other hand, an exhaust chamber 71 is defined on the outer peripheral side of the inner tubular portion 50.

The high heat transfer fan blade 51 is made of an aluminum alloy and has a strip shape. The inside of the high heat transfer fan blade 51 is hollow, and an intake passage 53 is bored in the longitudinal direction. The high heat transfer fan blades 51 extend radially from the inner tubular portion 50. That is, the high heat transfer fan blade 51 is arranged in the exhaust chamber 71. The inner peripheral edge of the high heat transfer fan blade 51 has an inner cylindrical portion 50.
It is fixed by penetrating through. Therefore, the intake passage 53 and the intake chamber 70 communicate with each other in the radial direction. Further, a total of 10 high heat transfer fan blades 51 are arranged in the circumferential direction of the inner tubular portion 50 with a predetermined angle therebetween. In addition, each high heat transfer fan blade 51, with respect to the axis of the inner cylindrical portion 50,
It is arranged so as to be inclined at a predetermined angle.

The outer cylinder portion 52 is made of an aluminum alloy and has a cylindrical shape. The outer cylinder portion 52 is fixed to the outer peripheral end of the high heat transfer fan blade 51. Specifically, the outer peripheral end of the high heat transfer fan blade 51 penetrates the outer cylindrical portion 52 and is fixed thereto. Therefore, the intake passage 53 and the outer cylinder portion 52
The outer peripheral side of the is communicated in the radial direction.

Next, a method of assembling the intake / exhaust fan of this embodiment will be described. In assembling, first, the high heat transfer fan blade 51 is attached to the inner tubular portion 50 and the outer tubular portion 52.
And the impeller 5 is manufactured. Then, next, the rotary shaft 402 of the motor 401 is fixed to the inner cylinder portion 50. In this way, the motor 401 and the impeller 5 are integrated. Then, the impeller 5 and the motor 401, which are integrated, are housed in the preformed cup portion 40. And the cup part 4
Fasten 0 to ceiling 2. After that, the intake suction cylinder portion 42 in which the air cleaning filter 48 is arranged in advance and the exhaust discharge cylinder portion 43.
And are fastened to the cup portion 40 from above the ceiling 2, respectively. In this way, the intake / exhaust fan 1 of this embodiment is assembled.

Next, the flow of intake air and exhaust air in the intake / exhaust fan of this embodiment will be described. First, the flow of intake air will be described. As shown by the white arrow in FIG. 2, the intake air first flows into the intake air intake port 44 from the outside 3 by the air flow generated as the vehicle moves. Then, the inflowing intake air passes through the air cleaning filter 48. At this time, the dust in the intake air is removed. Subsequently, the intake air flows into the intake chamber 70 via the inside of the intake intake cylinder portion 42. Then, the intake air passes through the intake passage 53. Finally, the intake air that has passed through the intake passage 53 is exhausted into the room 6 from the intake exhaust port 46. That is, the intake air flows through the path of the outside 3, the intake intake port 44, the air cleaning filter 48, the intake chamber 70, the intake passage 53, the intake outlet 46, and the room 6. In this way, intake air is taken into the room 6 from the outside 3.

Next, the flow of exhaust gas will be described. Figure 2
When the impeller 5 is rotated by the motor 401, a negative pressure is generated in the exhaust chamber 71, as indicated by a thick arrow. Due to this negative pressure, the exhaust gas is first exhausted from the room 6 through the exhaust air intake port 47.
Through the exhaust chamber 71. Then, the exhaust gas is exhausted to the outside 3 from the exhaust gas exhaust port 45 via the exhaust gas exhaust tube portion 43. That is, the exhaust gas is from the room 6 to the exhaust gas intake port 4
7 → Exhaust chamber 71 → Exhaust outlet 45 → External 3 In this way, the exhaust gas is discharged from the room 6 to the outside 3.

Next, the effect of the intake / exhaust fan of this embodiment will be described. In the intake / exhaust fan 1 of the present embodiment, the intake chamber 70 and the exhaust chamber 71 are arranged side by side in the radial direction. Therefore, the axial length of the impeller 5 is short. Therefore, the intake / exhaust fan 1 of this embodiment is relatively small. Further, the intake / exhaust fan 1 of the present embodiment has a small number of parts and a simple structure. Also, the number of assembly steps is small. Therefore,
The manufacturing cost is also low.

Further, the intake / exhaust fan 1 of this embodiment is provided with an air cleaning filter 48. Therefore, the intake air can be efficiently cleaned before the intake air flows into the room 6.

Further, the intake / exhaust fan 1 of this embodiment is provided with a high heat transfer fan blade 51 made of aluminum alloy.
Aluminum alloys have a relatively high heat transfer coefficient. Therefore,
According to the intake / exhaust fan 1 of the present embodiment, heat can be quickly exchanged between the intake air in the intake passage 53 and the exhaust air in the exhaust chamber 71. Therefore, fluctuations in room temperature can be suppressed. The intake / exhaust fan 1 of the present embodiment also includes an inner cylinder portion 50 and an outer cylinder portion 52, which are also made of aluminum alloy. Also in this respect, according to the intake / exhaust fan 1 of the present embodiment, it is possible to quickly perform heat exchange between intake air and exhaust air.

Further, the intake / exhaust fan 1 of this embodiment has an intake passage 53. For this reason, it is possible to secure the intake air flow path with space efficiency. In addition, the intake passage 5
3 is arranged in all of the 10 high heat transfer fan blades 51. Therefore, it is possible to secure a relatively wide channel cross-sectional area. Further, the high heat transfer fan blade 51 is lightened by the amount of the intake passage 53 arranged. Also,
The intake / exhaust fan 1 of the present embodiment includes an outer cylinder portion 52. For this reason, the high heat transfer fan blade 51 is
It is firmly held between 0 and the outer tubular portion 52.

(2) Second Embodiment The difference between this embodiment and the first embodiment is that only one intake / exhaust port is arranged. In addition, a guide cylinder portion that guides the flow of intake air to the intake air outlet is arranged. Therefore, only the differences will be described here.

FIG. 3 is a perspective view of the intake / exhaust fan of this embodiment. The members corresponding to those in FIG. 1 are indicated by the same symbols. As shown in the drawing, a guide cylinder portion 49 is formed on the outer peripheral side of the cup portion 40. The guide tube portion 49 is
It is included in the intake guide portion of the present invention. The guide tube portion 49 extends rearward in the room 6. An intake / exhaust port 46 is opened at the rear end of the guide tube portion 49. The intake air flowing out from the intake passage in the high heat transfer fan blade 51 flows along the inner peripheral surface of the cup portion 40. Then, the intake air is collected by the guide tube portion 49 and flows out into the room 6 from the intake / exhaust port 46.

According to the intake / exhaust fan 1 of this embodiment, the intake / exhaust port 46 is open rearward. Therefore, the possibility that the intake air directly hits the driver is small. Therefore, the comfort of the driver is improved. Further, according to the intake / exhaust fan 1 of the present embodiment, the inside of the room 6 is rearward → downward → forward →
It is possible to form a circular flow from upward to backward. Therefore, the entire room 6 can be uniformly ventilated.

(3) Third Embodiment The difference between this embodiment and the first embodiment is that the outer cylinder blades are arranged on the impeller. Therefore, only the differences will be described here.

FIG. 4 shows a perspective view of the impeller arranged in the intake / exhaust fan of this embodiment. The members corresponding to those in FIG. 1 are indicated by the same symbols. As shown in the drawing, an outer cylinder blade 54 made of aluminum alloy is extended from the outer peripheral surface of the outer cylinder portion 52 in the radial direction. The outer cylinder blade 54 is included in the intake air flow generating means of the present invention. When the impeller 5 rotates, the outer cylinder blade 54 also rotates. When the outer cylinder blades 54 rotate, negative pressure is generated on the outer peripheral side of the outer cylinder part 52. For this reason, the flow velocity of the intake air flowing into the outer peripheral side of the outer tubular portion 52 increases.

According to the intake / exhaust fan of this embodiment, the flow rate of intake air becomes large. As the flow rate of intake air increases, the flow rate of exhaust gas also increases. Therefore, according to the intake / exhaust fan of the present embodiment, the intake / exhaust amount can be increased.

(4) Fourth Embodiment The difference between this embodiment and the first embodiment is that the inner cylinder blade is arranged on the impeller. In addition, instead of the high heat transfer fan blade, a fan blade having no intake passage is arranged. In addition, the intake and exhaust ports are opened in the center of the case. Therefore, only the differences will be described here.

FIG. 5 shows an enlarged view of the vicinity of the inner cylinder portion of the impeller arranged in the intake / exhaust fan of this embodiment. The members corresponding to those in FIG. 1 are indicated by the same symbols. As shown in the figure, an inner cylinder blade 55 made of an aluminum alloy is extended from the inner peripheral surface of the inner cylinder part 50 in the diameter reducing direction. The inner cylinder blade 55 is included in the intake air flow generation means of the present invention. Also,
The inner cylinder blade 55 is inclined with respect to the axis of the inner cylinder portion 5 in a direction opposite to the fan blade 56 by a predetermined angle.

FIG. 6 shows a sectional view of the intake and exhaust fan of this embodiment. Note that members corresponding to those in FIG. 2 are indicated by the same symbols. When the impeller 5 rotates, the inner cylinder blade 55 also rotates. When the inner cylinder blade 55 rotates, a negative pressure is generated on the inner peripheral side of the inner cylinder part 50, that is, in the intake chamber 70. Therefore, the flow velocity of the intake air flowing into the intake chamber 70 increases. Therefore, the flow velocity of the intake air flowing out from the intake air outlet 46 also increases.

According to the intake / exhaust fan of this embodiment, the flow rate of intake air becomes large. As the flow rate of intake air increases, the flow rate of exhaust gas also increases. Therefore, according to the intake / exhaust fan of the present embodiment, the intake / exhaust amount can be increased.

(5) Others The embodiments of the intake and exhaust fans of the present invention have been described above. However, the embodiment is not particularly limited to the above embodiment. It is also possible to make various modifications and improvements that can be made by those skilled in the art.

For example, in the intake / exhaust fan of the above embodiment, the motor 401 is arranged in the recess 400. However, the position of the motor 401 is not particularly limited. For example, it may be arranged so as to project from the ceiling 2 to the outside 3. Further, the impeller 5 may be driven by using another power source such as a battery without disposing the motor 401.

Further, in the intake / exhaust fan of the above embodiment, the air cleaning filter 48 is arranged as the intake processing means. However, for example, a negative ion generator, a fragrance, a deodorizer, a dehumidifier, etc. may be arranged. The intake / exhaust fans of the above-described embodiments are all arranged on the ceiling 2 of the vehicle. However, it may be arranged, for example, on the ceiling of the bathroom.

[0042]

According to the present invention, it is possible to provide an intake / exhaust fan that has a small number of parts, has a simple structure, and can be downsized.

[Brief description of drawings]

FIG. 1 is a perspective view of an intake / exhaust fan according to a first embodiment.

FIG. 2 is a sectional view taken along line I-I of FIG.

FIG. 3 is a perspective view of an intake / exhaust fan according to a second embodiment.

FIG. 4 is a perspective view of an impeller arranged in an intake / exhaust fan according to a third embodiment.

FIG. 5 is an enlarged view of the vicinity of the inner cylinder portion of the impeller arranged in the intake / exhaust fan of the fourth embodiment.

FIG. 6 is a cross-sectional view of an intake / exhaust fan according to a fourth embodiment.

FIG. 7 is a cross-sectional view of a conventional intake / exhaust fan.

[Explanation of symbols]

1: intake / exhaust fan, 2: ceiling, 3: outside, 4: case,
40: cup part, 400: concave part, 401: motor, 40
2: rotary shaft, 42: intake suction cylinder part, 43: exhaust discharge cylinder part, 44: intake suction port, 45: exhaust discharge port, 46: intake discharge port, 47: exhaust suction port, 48: air cleaning filter (intake Processing means), 49: guide cylinder (intake guide),
5: Impeller, 50: Inner cylinder part, 51: High heat transfer fan blade, 52: Outer cylinder part, 53: Intake passage, 54: Outer cylinder blade (intake flow generating means), 55: Inner cylinder blade (intake flow generation Means), 56: fan blade, 6: indoor, 70: intake chamber, 71: exhaust chamber.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F04D 29/30 F04D 29/30 B E 29/32 29/32 B E J 29/38 29/38 A C F 29/44 29/44 GP Q W 29/52 29/52 C E 29/54 29/54 C D F 29/70 29/70 K L F24F 7/08 F24F 7/08 Z F Term (reference) 3H032 NA08 NA09 NA10 3H033 AA02 AA18 BB02 BB06 BB08 BB10 BB11 CC01 CC03 DD06 DD21 DD26 DD30 EE00 EE02 3H034 AA02 AA18 BB02 BB06 BB08 BB11 CC01 CC03 DD01 DD02 DD12 DD24 DD30 EE02 EE12

Claims (7)

[Claims] 1. An intake port for taking in intake air from the outside,
A case in which an intake outlet for discharging the intake air into the room, an exhaust inlet for taking in the exhaust air from the room, and an exhaust outlet for discharging the exhaust air to the outside are provided, and the intake inlet in the case. And an inner cylinder portion that partitions an intake chamber communicating with the intake / exhaust port on the inner peripheral side and an exhaust chamber communicating with the exhaust suction port and the exhaust / exhaust port on the outer peripheral side, respectively, and radially from the inner cylindrical part. An intake-exhaust fan, comprising: an impeller that is extended and has a fan blade that generates a swirling airflow in the exhaust chamber. 2. The intake / exhaust fan according to claim 1, further comprising an intake processing means for processing intake air on the downstream side of the intake air intake port. 3. The intake / exhaust fan according to claim 1, further comprising an intake air flow generation unit forcibly creating an intake air flow downstream of the intake air intake port. 4. The intake / exhaust fan according to claim 1, wherein the fan blade is a passage fan blade having an intake passage that communicates with the intake chamber and the intake / exhaust port and that extends in the radial direction. 5. The impeller further has an outer cylinder portion in which the passage fan blade is fixed to an inner peripheral side.
Intake and exhaust fan described in. 6. The intake / exhaust fan according to claim 4, wherein the case has a single intake / exhaust port, and has an intake guide part that collects intake air from the intake passage and guides the intake air to the intake / exhaust port. 7. The intake / exhaust fan according to claim 4, wherein the passage fan blade is a high heat transfer fan blade made of a material having a high heat transfer coefficient.