JP4603839B2 - Air conditioning fan - Google Patents

Description

  The present invention relates to an air conditioning ventilator that performs heat exchange between intake air and exhaust gas.

In order to answer problems such as house chic in newly built houses, the Building Standards Act has been revised and so-called 24-hour ventilation is required to provide indoor air ventilation equipment. As one of the facilities that realizes 24-hour ventilation, there is an air-conditioning ventilation fan that has a function of reducing energy loss by exchanging heat between outdoor intake and indoor exhaust.
Such an air-conditioning fan is operated for 24 hours, so it can be operated with low power consumption, noise that is difficult to notice even when operating at midnight, large ventilation (air flow), and the influence of outdoor wind The demand for high static pressure, which is difficult to be affected, is becoming stronger. Moreover, since it is often provided behind the ceiling, there is a strong demand for being small and lightweight.

Conventionally, there has been a structure of an air-conditioning ventilation fan having a heat exchanger in a main body frame and storing two sirocco fans for intake and exhaust by a motor as an air source. In the sirocco fan, since the blades of the impeller are directed in the rotational direction, the fan has a feature capable of increasing the pressure increase of the fan. However, it is necessary to increase the flow path of the scroll for decelerating the flow.
As one using a sirocco fan, for example, as shown in Patent Document 1, there is one that drives two sirocco fans with one motor. The two sirocco fans have the same outer diameter and the same blade width.

  In addition, as shown in Patent Document 2, there is an impeller having a rotating shaft that is horizontal at the time of installation and having a blade that moves backward, and the periphery of the impeller is not a scroll but a cylindrical casing. I am trying.

JP 2001-263753 A

Japanese Patent Laid-Open No. 11-264592

However, in the case of Patent Document 1, there is a problem that the width of the impeller is increased when the air volume is output, and the scroll is increased when an efficient fan is obtained.
Next, Patent Document 2 has a problem that the efficiency as a fan cannot be improved because the flow exiting the impeller cannot be effectively decelerated. In such an air-conditioning ventilation fan, trying to achieve high static pressure, large air volume, and low noise without increasing the motor input will increase the performance of the fan impeller and increase the uniformity of the flow into the impeller. In addition to the problem of effectively recovering the flow that exits the impeller as a pressure, it reduces the fluid resistance due to the flow in the flow path provided before and after the impeller, or generates noise due to the turbulence of the flow such as vortex There is a problem such as blocking. Furthermore, if the miniaturization is promoted, the flow path becomes narrow, and the fluid resistance tends to increase. Therefore, there is a problem that the fluid resistance must be reduced. There is also a problem that the indoor static pressure is set higher than the outdoor static pressure at the time of installation, thereby preventing air from entering from outside the apparatus.
An object of the present invention is to provide an air-conditioning ventilation fan that solves the above-described problems, saves input, operates with low energy, has low noise, has a large ventilation volume (air volume), and can suppress intrusion of airflow outside the apparatus. .

  In order to achieve the above object, the present invention is characterized in that a main body frame forming an outer shell and forming an exhaust passage and an intake passage therein, a motor provided in the main body frame, and fixing the motor A motor frame, an exhaust impeller located on one side of the motor frame and provided in the exhaust passage and driven by the motor; and a motor frame located on the other side of the motor frame and provided in the intake passage. An intake impeller to be driven, and the intake impeller and the exhaust impeller are impellers having blades retreating in a rotation direction, and the motor frame is moved toward the exhaust passage from the center of the main body, and the motor Is moved to the exhaust passage side of the motor frame.

  Further, the present invention is characterized in that a main body frame that forms an outer shell and forms an exhaust passage and an intake passage inside, a motor provided in the main body frame, a motor frame that fixes the motor, An exhaust impeller located on one side of the motor frame and provided in the exhaust passage and driven by the motor; and an intake vane located on the other side of the motor frame and provided in the intake passage and driven by the motor The intake impeller and the exhaust impeller are impellers having blades that retreat in the rotational direction, and the motor frame is moved toward the exhaust passage so that the exhaust passage is narrower than the intake passage. At the same time, the motor is moved to the exhaust passage side of the motor frame.

Furthermore, the number of intake impellers and the number of exhaust impellers are in a prime relationship.
Further, the inner diameter of the intake impeller is made larger than the inner diameter of the exhaust impeller.
Still further, the present invention is characterized in that a main body frame forming an outer shell and forming an exhaust passage and an intake passage inside, a motor provided in the main body frame, a motor frame for fixing the motor, An exhaust impeller located on one side of the motor frame and provided in the exhaust passage and driven by the motor, and an intake air located on the other side of the motor frame and provided in the intake passage and driven by the motor and a impeller, the intake impeller and the exhaust impeller is an impeller with vanes retracted in the direction of rotation, the exhaust pressure increase value of the intake system constituted by the intake passage and the intake impeller This is because the pressure rise value of the exhaust system constituted by the passage and the exhaust impeller is made larger.

  In the air-conditioning ventilation fan of the present invention, energy saving that can be operated with little input, low noise, large ventilation volume (air volume), and the effect of suppressing the intrusion of airflow outside the apparatus can be obtained.

  Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a cross-sectional view of one embodiment of the apparatus of the present invention. 2 is a cross-sectional view taken along the line AA in FIG. FIG. 3 is a sectional view taken along line BB. FIG. 4 is a perspective view showing the intake casing, the exhaust casing, the intake impeller, the exhaust impeller, the motor, and the motor frame. FIG. 5 is a perspective view of the CC cross section of FIG. FIG. 6 is a cross-sectional view of the intake impeller. FIG. 7 is a plan view when the side plate of the intake impeller is removed. FIG. 8 is a perspective view when the intake impeller is disassembled. FIG. 9 is a perspective view when the intake impeller is disassembled. FIG. 10 is a cross-sectional view of the exhaust impeller. FIG. 11 is a plan view when the side plate of the intake impeller is removed. FIG. 12 is a developed perspective view of the air-conditioning ventilation fan.

  FIG. 1 is upside down from the actual installation. The main body of the apparatus is fixed to suspension bolts (not shown) attached to beams on the back of the ceiling via four hooks 61 shown in FIG. 3, and the panel frame 2 and the panel 1 are exposed to the indoor side. As shown in FIG. 12, a main body frame B24 and a main body frame C25 are screwed to both sides of a U-shaped main body frame A23 to constitute a main body. An intake chamber inner side adapter 16 is attached to the main body frame B24. The air intake room inner side adapter 16 has five duct connecting portions 26, and each duct connecting portion 26 is connected to a flexible duct (not shown) having a diameter of 50 mm, which is connected to a necessary place indoors. Connected to an opening. In addition, an air supply / exhaust chamber outer adapter 17 is attached to the main body frame C25. As shown in FIGS. 2 and 3, the air supply / exhaust chamber outer adapter 17 is provided with an intake duct connecting portion 52 and an exhaust duct connecting portion 22, each having a flexible duct (not shown) having a diameter of 100 mm. Connected and led to an outdoor opening. Hereinafter, the body frame A23, the body frame B24, and the body frame C25 assembled together will be referred to as a body frame 30.

  The main body frame 30 constitutes the outline of the apparatus and is formed in a box shape so that the indoor side is opened when attached to the ceiling or the like. A panel frame 2 and a panel 1 that is detachably attached to the panel frame 2 are provided on the opening side.

  1 is attached to the rotating shaft of the motor 4 fixed to the motor frame 7 with an intake impeller 5 for intake from outside and an exhaust impeller 6 for exhausting outside. The motor frame 7 is sandwiched between the intake casing 8 surrounding the intake impeller 5 and the exhaust casing 9 surrounding the exhaust impeller 6, and the body cover 32 is screwed to the body frame A 23. Is positioned by. The motor frame 7 is disposed so as to partition the exhaust passage and the intake passage. These positions on the right side are in contact with the intake chamber inner side adapter 16 to maintain airtightness. Further, the airtightness between the intake casing 8 side and the exhaust casing 9 side is maintained by contact with the motor frame 7. A lid 62 is bonded to the intake casing 8 to form the scroll flow path 21 and the impeller front flow path 15. In addition, a lid 63 is bonded to the exhaust casing 9 to form a scroll flow path 20 and an impeller front flow path 19.

  Reference numeral 3 denotes a heat exchanger, which is provided with thinly divided flow paths in directions orthogonal to each other, each having a layer shape, and the flow paths in the layers are alternately arranged. The whole is a rectangular parallelepiped, and has a flow path that flows from the top to the bottom in the figure and a flow path that flows from the left side to the right side in the figure. The corners of the heat exchanger 3 are supported by the heat exchanger casing 10 and are pressed and fixed by the heat exchanger cover 31. A heat insulating material is stuck on the heat exchanger cover 31, whereby the upper surface of the heat exchanger 3 in the figure is sealed, and the right and left and the lower side are brought into contact with the heat exchanger casing 10 to be airtight. It has been. The right side of the heat exchange casing 10 in the figure and the exhaust casing 9 are kept airtight by contact. Further, a filter 43 is installed in the opening of the heat exchanger cover 31 facing the heat exchanger 3 to remove large dust from the room.

  Further, the heat exchanger casing 10 is provided with three filters 13, and as shown in FIG. 2, there is a control circuit chamber 42 that houses the control circuit 41 on one side (lower side in the figure). In the interior of the control circuit chamber 42, a passage for guiding indoor air to the exhaust duct connection portion 22 is disposed, and is separated from the intake-side flow path in an airtight manner. In addition, the intake duct connecting portion 52 of the supply / exhaust chamber outer adapter 17 and the passage communicate with each other. These passages are hermetically sealed with each other in the heat exchanger casing 10.

  A panel frame 2 is screwed to the heat exchanger cover 31, and the panel 1 is rotatably installed on the panel frame 2. A plurality of openings are provided on the four circumferences of the panel 1.

  Since the heat exchanger casing 10, the intake casing 8, and the exhaust casing 9 are made of foamed polystyrene, they are insulated from the outside of the apparatus. In addition, although air outside the apparatus may be cooled and dewed by cold air from outside such as in winter, the inside of the apparatus is insulated, so that it is possible to prevent dew condensation.

  The air-conditioning ventilation fan of this embodiment is particularly suitable for apartments such as apartments with a relatively wide ceiling, but in single-family houses etc., it may be installed behind the ceiling and used with the intake duct downstairs. is there. Further, any position on the main body frame 30 may be connected to the intake air from the outside, the exhaust duct, and the intake duct to the indoor side. In addition to being attached to the ceiling, the main body frame 30 may be installed indoors so that the design surface can be formed by changing the size of the panel or the like.

  Moreover, although the flow direction of the heat exchanger 3 intersects the vertical direction and the horizontal direction at the time of installation, the air flow may be inclined by 45 degrees so that the air flow is inclined.

  Next, the flow of air will be described. The flow exhausted from the room to the outside is indicated by an arrow 12 (FIGS. 1 to 3). When air enters from around the panel 1 and passes through the filter 43 of the heat exchanger cover 31, large dust is removed and flows into the heat exchanger 3. The air leaving the heat exchanger 3 is collected in the collecting flow path 18 located on the opposite side of the panel 1, turned 90 degrees, directed to the right in the figure, passed through the impeller front flow path 19, It passes through the bell mouth 44 and flows into the exhaust impeller 6. The air that has passed through the exhaust impeller 6 passes through the scroll passage 20 defined by the exhaust casing 9 and the motor frame 7, passes through the communication passage 51, reaches the waste duct connection portion 22, and is connected to the outside. The air is exhausted outside through a duct (not shown). A portion of the series of exhausted air flows is referred to as an exhaust passage. The panel 1 may be a grill having an opening on the front surface.

  A system that takes air from outdoors into the room is indicated by an arrow 11 as shown in FIG. Air from the outside enters the intake duct connection 52 through the intake duct (not shown), enters the heat exchanger 3 through the three-layer filter 13, flows from the left side to the right side in the figure, and collects Collected by the path 53, reaches the pre-intake impeller flow path 15, and flows into the intake impeller 5 through the bell mouth 45. The flow exiting the intake impeller 5 passes through the scroll flow passage 21 formed by the intake casing 8 and the motor frame, and is connected to the intake duct connecting portion 26 via the communication passage 54 (see FIG. (Not shown) is supplied to each room indoors. Since this intake chamber inner side adapter 16 has five connection ports, air can be supplied to a maximum of five locations. A part of the series of air flowing through the intake air is referred to as an intake passage.

  In addition, since an intake system and an exhaust system have the movement of the air between indoor rooms, if it is included, air will flow in from the outdoors and will be exhausted outdoors. At this time, it is possible to increase the indoor pressure with respect to the outdoors by setting the intake system capacity up to the duct piping and setting the high static pressure with the same air volume to the exhaust system. Can be prevented. For example, it is preferable because a cold draft is eliminated when the temperature in winter is low and a hot draft in summer is eliminated. In this embodiment, since the intake capacity is high, in other words, the pressure increase in the intake system at the same air volume is set larger than that in the exhaust system, the above problem does not occur.

  The operation method of this apparatus will be described. In this device, two modes of strong driving and weak driving are prepared. When a switch installed on a wall or the like is turned on, the control circuit 41 determines that the motor 4 is activated. As the motor 4 rotates, the intake impeller 5 and the exhaust impeller 6 directly connected to the motor 4 rotate, and air flows using the centrifugal force of the impeller. Heat is exchanged between the intake air and the exhaust gas in the heat exchanger 3, fresh air from the outside is supplied indoors, and air having a low oxygen concentration is exhausted outdoors. The normal switch is always on.

  The intake impeller 5 and the exhaust impeller 6 are shaped so that the blades retreat with respect to the rotation direction, and are generally of a type called a centrifugal fan or a turbo fan. Although only the impeller is often referred to as a fan, the characteristics will be degraded if there is no static pressure recovery in the scroll flow path, etc., so here the impeller front flow path, impeller and scroll flow path are combined. I will call it a fan. In an air-conditioning exhaust fan, an impeller whose blade outlet advances in the rotation direction is often used, and such a fan is called a sirocco fan or a multi-blade fan. The turbo fan has a characteristic that the speed of the exit of the impeller is slower than that of the sirocco fan, and the amount of dynamic pressure recovered to the static pressure due to the deceleration at the stationary part such as the scroll flow path can be reduced accordingly. If the static pressure recovery in the scroll channel can be reduced, the size of the scroll channel can be reduced, which is suitable for downsizing.

  In the present embodiment, the size of the air conditioning ventilation fan is 210 mm in height, 400 mm in width, and 660 mm in length, and since the width and height are particularly small, a centrifugal fan is employed to take advantage of the above advantages.

  In this embodiment, in order to increase the capacity on the intake side, the position of the motor frame 7 is moved 11 mm from the center in the height direction to the exhaust side, and the intake side space is 22 mm larger than the exhaust side space. Further, the position of the motor 4 is moved 8 mm toward the exhaust side, and the protrusion of the motor 4 to the intake side is made shorter than the exhaust side 16 mm. On the intake side, the thickness direction of the impeller front passage 15 is increased, and the length of the annular portion of the eyeball portion formed on the inlet side of the side plate of the impeller is increased so that the inflow flow from the bell mouth The loss is reduced by attaching to the side plate of the car before entering the vane.

  As shown in FIGS. 5 to 9, the intake impeller 5 includes a main plate 66, a blade 67 integrated with the main plate 66, and a side plate 65, and the central portion of the main plate 66 has an elastic body 82 such as rubber. A shaft fastening portion 81 is attached via Although the outer peripheral side of the main plate 66 is a flat surface, the inner side is shaped to be a part of a conical shape, and the central portion is a flat surface. This conical portion serves to reduce the bending loss when the inlet flow entering the axial direction of the intake impeller 5 turns in the radial direction. Further, the outer peripheral side of the side plate 65 forms a part of a conical shape, but the center side forms a part of a cylinder, and both are connected by a smooth curved surface. The part forming this cylinder is defined as an annular part. If the ring part is long, the inflow flow from the bell mouth takes a sufficient length of the ring part to adhere to the side plate, so that the disturbance at the blade inlet can be suppressed, the fluid resistance can be reduced, and Noise generation can be suppressed.

  The blades 67 of the intake impeller 5 are shaped to retreat with respect to the rotation direction 69. In addition, since the airfoil is used for the cross-sectional shape, there is little loss. Further, the exit angle β2 of the blade 67 is raised to 90 degrees to increase the work as the impeller and increase the pressure increase in the fan.

  As shown in FIGS. 10 and 11, the exhaust impeller 6 is composed of a blade 73 and a side plate 71 integrated with the main plate 72, and the central portion of the main plate 72 is fastened via an elastic body such as rubber. Part 75 is attached. The inner diameter d0 of the center side portion of the side plate is large because the portion 74 that forms a part of the cone of the main plate 72 protrudes forward on the center side. In addition, the inner diameter side portion of the side plate 71 is only rounded when viewed in cross section, and there is no annular portion.

  On the other hand, in the intake impeller 5, since the motor is small, when the area of the inlet portion of the impeller blade is ensured, the diameter of the center portion can be reduced, so the distance from the impeller inlet to the outlet is reduced. The loss can be reduced by gradual deceleration within the impeller. On the exhaust side, the motor part protrudes toward the impeller inlet side, so when securing the area at the inlet part of the impeller blades, the diameter of the eyeball part must be increased. In the case of this embodiment, the eyeball diameter d0 of the intake impeller is 140 mm, and the eyeball diameter d0 on the exhaust side is 164 mm. Also, the bell mouth part of the intake casing has an overlapping part with the side plate of the impeller and enters the inside of the ring part of the side plate, so the inner diameter of the bell mouth part is 122 mm on the intake side. On the exhaust side, the inner diameter on the intake side is 146 mm, which is smaller.

In addition, the intake impeller 5 has a large blade outlet angle β2 of 90 degrees, which is larger than the 45 ° outlet angle of the exhaust impeller 6 so that it can do a lot of work, and the static pressure of the fan is high. It is trying to become. Even if the outer diameter of the impeller is increased, the static pressure can be increased, so such a method may be used, but the space of the scroll flow path is reduced, and even if the pressure rise is increased by the impeller, Since the flow deceleration amount cannot be obtained and the static pressure cannot be increased as a whole, the static pressure can be increased at the blade outlet angle. Furthermore, the number of blades is 7 for the intake impeller 5 and 5 for the exhaust impeller 6, which increases the amount of work on the intake side. In addition, since the loss of those who do a lot of work is reduced, overall efficiency can be improved. In the case of this device, the performance of the intake system is as follows. When the flow rate is 150 m ³ / h without an indoor piping duct, the intake system has a pressure increase of about 100 Pa (in the measurement, the load resistance is 100 Pa. Can be measured as static pressure), and the exhaust system has a pressure increase of 0 Pa. Even if the resistance of the piping system is taken into consideration, the pressure increase in the exhaust system is larger than the pressure increase in the exhaust system.

  In addition, since the impeller is fixed to the rotating shaft of the motor 4 via an elastic body, electromagnetic vibration generated by the motor during operation is transmitted to the impeller, and the impeller vibrates and becomes a sound source to generate noise. Can be prevented from occurring. In this embodiment, a brushless motor is employed as the motor 4 and is driven by an inverter. Therefore, noise having a frequency that is 24 times the number of revolutions, which is a product of three phases and eight poles, is generated. This is kept small by this fastening method. Further, since the motor 4 is sandwiched from both sides and is fixed to the motor frame 7 via an elastic body, transmission of electromagnetic vibration to the motor frame 7 can be suppressed. Furthermore, since the motor frame 7 is sandwiched and supported by the intake casing 8 and the exhaust casing 9, and positioned, the transmission to the main body frame A23 can also be suppressed, so that the generation of electromagnetic noise can be further suppressed.

  Furthermore, since the outer peripheral side of the side plate is shaped like a part of a cone, the rigidity can be increased and the impeller can be made thin, so that the weight can be reduced. Further, as shown in FIGS. 8 and 9, a groove 68 for fitting a blade is provided in the side plate 65, and ultrasonic welding is performed after the blade 67 is fitted in the recess. As a result, the positioning can be firmly performed, so that the unbalance generated in the impeller at the stage of making the mold can be reduced, so that the vibration due to the centrifugal force generated with the rotation can be reduced, the noise of the rotational speed can be reduced, and the main body frame 1A. The vibration transmitted to the frame of the house and the frame of the house is also reduced, and the noise generated thereby can be reduced. The side plate may be bonded to the blade.

  In the present invention, the number of the blades 67 of the intake impeller 5 is 7, the number of the blades 73 of the exhaust impeller 6 is 5, and the frequency that is the product of the number of blades and the number of rotations generated by both is used as a fundamental frequency. The frequency of the blade sound generated at an integral multiple of the frequency is made different between the two. As a result, the two impellers are prevented from being generated at the same frequency, thereby preventing the impeller from becoming large. Furthermore, since it does not coincide with the electromagnetic sound generated by the motor, it is further prevented that the noise is maximized in combination.

  Further, the nose 55 of the scroll passage 21 of the intake casing 8 is inclined, and the flow gathered in the scroll passage 21 is prevented from reaching the nose 21 at the same time, so that an effect of preventing blade noise can be obtained. It is done. In the present embodiment, the oblique angle is 65 degrees. It is almost equal to the blade interval at the outlet of the intake impeller.

  Further, the bell mouth 45 is formed in the flow passage 15 in front of the impeller 8 of the intake casing 8, but it is formed so as to be gently raised on the side opposite to the intake impeller so that the flow from the collecting passage 53 is at a lower speed. Therefore, the occurrence of turbulence is suppressed, the loss can be reduced and the generation of noise can be suppressed. Further, a rib 56 is provided so as to divide the impeller front flow path 15 into two parts, and when the flow from the front side in FIG. Therefore, loss can be reduced and generation of noise can be suppressed.

  Next, an assembly method of the apparatus will be described with reference to FIG. The main body frame C25 and the supply / exhaust chamber outer adapter 17 are screwed to the main body frame A23. Further, the packing 16 is bonded to the intake chamber inner side adapter 16, and the main body frame B24 is screwed. These are put together to form the main body frame 30. After the damping material 93 is pasted on the motor frame, the motor 4 is sandwiched between the motor adapters 94 and 95 and screwed to the motor frame 7 via the vibration isolating rubber. Thereafter, the intake impeller 5 and the exhaust impeller 6 are attached to the motor 4. The exhaust casing 9 with the lid 63 bonded is put in the main body frame 30, the motor frame 7 is put, the air intake casing 8 with the lid 62 bonded is put, and the casing cover 98 is screwed to the main body frame 30, Fix it.

  Next, the heat exchanger casing 10 is mounted, the heat exchanger 3 and the filter 13 are set at predetermined positions, the control circuit 41 including the wiring is placed in the control circuit chamber 42, and the wiring to the switch outside the apparatus is connected. Connecting. The heat exchanger cover 31 with the heat insulating material 91 is screwed to the main body frame, and after the filter 43 is attached, the panel frame 2 is fastened to the heat exchanger cover 31 and the panel 1 is screwed to the panel frame 2.

  For inspection and filter replacement after installation in the house, the filter 43 can be removed by removing the panel frame 2 from the heat exchanger cover 31. The filter 13 can be removed by removing the heat exchanger cover 31. If the heat exchanger casing can be removed, the right part of the figure can be removed by pulling it out to the left, so it can be disassembled.

  Since it is small and can realize high static pressure, large air volume, and low noise with low input, it is particularly suitable for an air-conditioning fan with 24-hour ventilation.

It is sectional drawing of the air-conditioning ventilation fan concerning one Example. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is the perspective view which put together the intake casing, the exhaust casing, the intake impeller, the exhaust impeller, the motor, and the motor frame. It is a perspective view when CC section of FIG. 1 is completed. It is sectional drawing of an intake impeller. It is a top view when the side plate of an intake impeller is removed. It is a perspective view when an intake impeller is disassembled. It is a perspective view when an intake impeller is disassembled. It is sectional drawing of an exhaust impeller. It is a top view when the side plate of an intake impeller is removed. It is an expansion perspective view of an air-conditioning ventilation fan.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Panel, 2 ... Panel frame, 3 ... Heat exchanger, 4 ... Motor, 5 ... Intake impeller, 6 ... Exhaust impeller, 7 ... Motor frame, 8 ... Intake casing, 9 ... Exhaust casing, 10 ... Heat exchange Casing 16, intake chamber inner side adapter 17, supply / exhaust chamber outer side adapter 20, scroll channel 21, scroll channel 23, body frame A 44, bell mouth 45, bell mouth

Claims (8)

  A main body frame that forms an exhaust passage and an intake passage inside the outer shell, a motor provided in the main body frame, a motor frame that fixes the motor, and an exhaust passage that is located on one side of the motor frame An exhaust impeller provided inside and driven by the motor; and an intake impeller located on the other side of the motor frame and provided in the intake passage and driven by the motor. The exhaust impeller is an impeller having blades retreating in the rotation direction, and the motor frame is brought closer to the exhaust passage side from the center of the main body, and the motor is brought closer to the exhaust passage side of the motor frame. Air conditioning ventilation fan.   A main body frame that forms an exhaust passage and an intake passage inside the outer shell, a motor provided in the main body frame, a motor frame that fixes the motor, and an exhaust passage that is located on one side of the motor frame An exhaust impeller provided inside and driven by the motor; and an intake impeller located on the other side of the motor frame and provided in the intake passage and driven by the motor. The exhaust impeller is an impeller having blades retreating in the rotation direction, the motor frame is brought closer to the exhaust passage so that the exhaust passage is narrower than the intake passage, and the motor is moved to the exhaust passage of the motor frame. Air-conditioning ventilation fan characterized by being brought to the side. In claim 1 or 2,
An air conditioning ventilation fan characterized in that the number of blades of the intake impeller and the number of blades of the exhaust impeller are in a prime relationship. In claim 1 or 2,
An air-conditioning ventilation fan characterized in that the diameter of the center part of the intake impeller is smaller than the diameter of the center part of the exhaust impeller. A main body frame that forms an exhaust passage and an intake passage inside the outer shell, a motor provided in the main body frame, a motor frame that fixes the motor, and an exhaust passage that is located on one side of the motor frame An exhaust impeller provided inside and driven by the motor; and an intake impeller located on the other side of the motor frame and provided in the intake passage and driven by the motor. The exhaust impeller is an impeller having blades retreating in the rotation direction, and an exhaust system configured by the exhaust passage and the exhaust impeller has a pressure increase value of an intake system configured by the intake passage and the intake impeller. An air-conditioning ventilation fan characterized in that it is larger than the pressure increase value of. In any of claims 1 to 5,
An air conditioning ventilation fan characterized in that an inner diameter of a bell mouth portion of the intake impeller is smaller than an inner diameter of a bell mouth portion of the exhaust impeller. In any one of Claim 1 to 6,
An air-conditioning ventilation fan, wherein an outlet angle of a blade of the intake impeller is larger than an outlet angle of a blade of the exhaust impeller. In any one of Claims 1-7,
The number of blades of the intake impeller is larger than the number of blades of the exhaust impeller.

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