JP2009008301A - Air blowing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air blowing device for a ventilation air blowing apparatus and an air conditioning apparatus comprising an air volume adjusting plate and a filter, capable of mounting and demounting the air volume adjusting plate and the filter, suppressing generation of noise when the air passes, reducing pressure loss of a suction grille, and eliminating noise. <P>SOLUTION: This air blowing device comprises a main body 3 and the suction grille 2, the main body 3 is provided with a blower 7 and an air intake port 4, the blower 7 is provided with a suction port 5, the suction grille 2 is provided with a ventilating portion 12 and the air volume adjusting plate 14 covering the ventilating portion 12 and having one round hole 15, a space 18 is defined between the blower 7 and the air volume adjusting plate 14, and the round hole 15 is formed roughly concentrically with the suction port 5, thus the air can be smoothly sucked as the round hole 15 is opened, and generation of disturbed flow can be suppressed as an angular portion does not exist. As the round hole 15 and the suction port 5 are roughly concentric, a part of the noise can be eliminated by the action of expansion type silencer, and the air blowing device capable of reducing pressure loss of the suction grille, and eliminating noise, can be provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a ventilation device such as a ventilation fan such as a ventilation fan provided with a suction grill provided with an air volume adjusting plate or a filter, and an air conditioner such as an air conditioner.

  Conventionally, this type of blower is known in which a suction grille is provided with an air volume adjusting plate for adjusting the intake air volume (see, for example, Patent Document 1).

  Hereinafter, the blower will be described with reference to FIG.

  As shown in FIG. 17, a suction grill 101 attached to cover a main body opening of a ceiling-embedded ventilation fan installed on a ceiling includes a decorative frame 103 in which an opening 102 communicating with the main body opening is formed, and a decorative frame An air volume adjusting plate 106 that is attached to 103 so as to cover the opening 102 and can fold the adjusting piece 105 formed in the main body 104 is provided.

  In the above configuration, the suction air volume of the suction grill 101 can be increased by bending the adjustment piece portion 105 of the air volume adjustment plate 106 to increase the opening amount of the opening portion 102, and the bending of the adjustment piece portion 105 is returned to the original state. By returning the opening amount of the opening portion 102 to the original amount, the suction air volume can be reduced.

  Conventionally, this type of blower is known that includes a suction filter that can be attached to and detached from the suction grill (for example, see Patent Document 2).

  Hereinafter, the blower will be described with reference to FIG.

As shown in FIG. 18, a suction grill 101 attached to the main body of a bathroom ventilation dryer is detachably attached to a grill frame 107 having an opening 102 for sucking air into the main body at the center and the opening 102. An intake panel 108 is provided, and the filter 109 can be fixed with the grill frame 107 and the intake panel 108 sandwiched, and the filter 112 can be attached / detached by attaching / detaching the air supply panel 108.
Japanese Patent Laid-Open No. 08-114344 JP 2000-055395 A

  In the conventional blower such as the former, since the shape of the opening 102 formed by bending the air volume adjusting plate 106 is slit-like, noise is generated when air passes and pressure loss is high. Therefore, there is a problem that the noise generated from the blower inside the main body increases, and the noise leaks out from the opening 102 without being silenced. There is a need for a blower that has low loss, can muffle noise from the inside, can be reduced in noise, and can adjust the air volume.

  Also, in the latter conventional blower, the noise generated from the blower inside the main body increases due to the pressure loss of the filter 109, but the noise leaks from the opening 102 without being silenced. There is a need to mute noise from the inside.

  The present invention solves such a conventional problem, and provides a blower device that suppresses the generation of noise during passage of air, reduces the pressure loss of the suction grille, and can mute the noise. It is aimed.

  In order to achieve the above object, the blower of the present invention includes a main body and a suction grille, a blower that blows air to the main body, an air intake port that takes in air, and a suction port that sucks air into the blower. It has a ventilation part that ventilates the air to the grill and an air volume adjustment plate that covers the ventilation part and adjusts the air volume, has one round hole in the air volume adjustment board, has a space between the blower and the air volume adjustment plate, Air blower characterized in that air is sucked and blown in the order of the suction grill vent, then the air volume adjustment plate round hole, then the air intake, and then the suction inlet, and the round hole is substantially concentric with the suction opening It is what.

  By this means, the air volume can be adjusted without changing the blower output by the round hole of the air volume adjusting plate, and the air can be sucked in smoothly compared to the square hole, so the generation of noise during air passage is suppressed. And a blower device that can reduce the pressure loss of the suction grille and that can muffle noise from the blower by forming an expansion-type resonance silencer mechanism in the space between the blower and the air volume adjustment plate. can get.

  Another means is a blower characterized by comprising means for adjusting the size of the round hole.

  By this means, it is applied to ceiling-embedded ventilation fans, etc., when the output of the blower varies depending on the duct construction state, or when there are multiple suction routes and the suction air volume of each suction route varies depending on the construction state, etc. A blower capable of adjusting the air volume according to the construction state is obtained.

  Another means is a blower characterized in that a plurality of circles concentric with the round hole of the air volume adjusting plate are drawn.

  By this means, a part of the air volume adjustment plate of the suction grill can be cut out along the circle to change the size of the round hole, so there is no need for additional parts for changing the area of the round hole, and it is accurate. Thus, a blower capable of changing the round hole to a desired area is obtained.

  Another means is a blower characterized in that a plurality of circles concentric with the round hole of the air volume adjusting plate are drawn by perforations.

  This means that a part of the air volume adjustment plate of the suction grill can be cut off along the perforation without using a tool to change the size of the round hole. Thus, a blower that can easily and accurately change the round hole to a desired area is obtained.

  The other means is an air blower characterized by comprising an opening of the air volume adjusting plate and an auxiliary plate attached so as to cover the opening and having a round hole.

  By preparing a plurality of auxiliary plates with different round hole areas by this means, the area of the round holes can be reduced when the required air volume changes after installation of the main unit or when the main unit is removed and installed in another location. A blower that can be easily and accurately changed is obtained.

  Another means is a blower characterized in that the auxiliary plate can be divided into a plurality of parts and can be fixed to the suction grille without overlapping the opening of the air volume adjusting plate.

  By this means, an auxiliary plate that is not used can be stored in the suction grille, and a blower that can be easily replaced when the air volume is changed is obtained.

  Another means is a blower characterized in that the round hole has a bell mouth shape.

  By this means, it is possible to obtain a blower capable of sucking air more smoothly and reducing pressure loss.

  Further, the other means is characterized in that it includes two air volume adjusting plates each having a semicircular cutout on one side, and the air flow adjusting plates are arranged so that the notches of the air flow adjusting plate face each other. This is a blower.

  By this means, the area of the round hole can be adjusted by adjusting the degree of overlap of the two air volume adjusting plates, and after the installation of the main body, an air blower capable of adjusting the air volume according to the construction state is obtained.

  Another means includes a main body and a suction grille, a blower that blows air to the main body, an air intake port that takes in air, a suction port that sucks air into the blower, and a ventilation part that vents air to the suction grille And a filter that covers the ventilation part and collects dust and the like in the air, and has a space between the blower and the suction grill. By the blower, the filter, then the ventilation part, then the air intake, and then the suction inlet In this order, the air is sucked and blown, and the ventilation portion is a single round hole substantially concentric with the suction port of the blower.

  By this means, there is obtained a blower device that can form a resonance silencer mechanism in the space between the blower and the suction grille and eliminate noise from the blower to reduce noise without requiring additional parts.

  Another means is a blower characterized in that a cylinder concentric with the round hole and having an inner diameter larger than the round hole is fixed to the blower in the main body with a gap between the air volume adjustment plate. Is.

  By this means, it is possible to form a Helmholtz resonator having a space between the blower and the air volume adjusting plate as a volume portion and a gap as a throat portion, and a blower device that can resonate and mute lower frequency noise can be obtained.

  Another means is a blower characterized in that the distance of the gap can be adjusted.

  By this means, by adjusting the distance of the gap, it is possible to obtain a blower device that can adjust the frequency of noise that is resonantly silenced in accordance with the frequency distribution of noise from the blower that varies depending on the construction state.

  Another means is a blower characterized in that it includes an attachment direction specifying means for specifying the attachment direction of the suction grill in one direction.

  By this means, a blower device can be obtained in which the suction grille can be easily attached in the direction in which the suction port of the blower and the round hole are substantially concentric during construction.

  Another means is a blower characterized in that the attachment direction specifying means is a mark provided on the main body and the suction grille.

  By this means, it is possible to obtain a blower device that can easily attach the suction grille in a direction in which the suction port of the blower and the round hole are substantially concentric by visual confirmation during construction.

  Another means is a blower characterized in that a plurality of attachment means for attaching the suction grille to the main body are arranged so as not to be point-symmetric at the center of the outer diameter of the suction grille.

  By this means, it is possible to obtain a blower capable of attaching the suction grille in a direction in which the suction port of the blower and the round hole are concentric with each other during construction.

  Another means is a blower characterized in that the round hole is located at the center of the outer shape of the suction grille.

  By this means, the direction in which the suction grill is attached is not limited, and there is an effect that the attaching operation can be facilitated.

  ADVANTAGE OF THE INVENTION According to this invention, it can provide the air blower which can suppress the generation | occurrence | production of the noise at the time of air passage, the pressure loss of a suction grille is low, and can mute a noise with the air blower which can adjust air volume and can attach or detach a filter. .

  The invention according to claim 1 of the present invention includes a main body and a suction grille, a blower for blowing air to the main body, an air intake port for taking in air, a suction port for sucking air into the blower, and an air in the suction grille A ventilation part that covers the ventilation part and an air volume adjustment plate that adjusts the air volume is provided, and a single round hole is provided in the air volume adjustment board, and a space is provided between the blower and the air volume adjustment plate. An air blower characterized in that air is sucked and blown in the order of the grill ventilation section, then the round hole of the air flow adjustment plate, then the air intake, and then the suction inlet, and the round hole is substantially concentric with the suction inlet; The air volume adjustment plate can adjust the air volume without changing the output of the blower by the round hole of the air volume adjustment plate, and it can suck in air smoothly compared to the square hole, so noise generation when passing air is avoided. Can suppress and reduce pressure loss, and It has an effect that it is possible to mute the noise from forming an expansion-type resonant silencer mechanism blower by the space between the blower and the air volume adjusting plate by a hole and suction port formed substantially concentric.

  In addition, it is a blower characterized by comprising means for adjusting the size of the round hole, and is applied to a ceiling-embedded ventilation fan or the like, and when the output of the blower varies depending on the duct construction state, When there are a plurality of suction routes and the suction air amount of each suction route varies depending on the construction state, the air amount can be adjusted according to the construction state.

  In addition, the blower is characterized in that a plurality of circles concentric with the round hole of the air volume adjusting plate are drawn, and a part of the air volume adjusting plate of the suction grill is cut out along the circle to form a round hole. Since the size can be changed, an additional part for changing the area of the round hole is unnecessary, and the round hole can be accurately changed to a desired area.

  Also, it is a blower characterized in that a plurality of circles concentric with the round hole of the air volume adjusting plate are drawn by perforations, and draw a circle with perforations with through holes arranged at equal intervals Can cut part of the air volume adjustment plate of the suction grill along the perforation without using tools, etc., and change the size of the round hole, so additional parts to change the area of the round hole Is not necessary, and the round hole can be easily and accurately changed to a desired area.

  Moreover, it is set as the air blower characterized by including the auxiliary | assistant board with which the opening of the air volume adjustment board and the opening were covered, and the round hole was opened, and several auxiliary | assistant board from which the area of a round hole differs By preparing the device, the area of the round hole can be easily and accurately changed when the required air volume changes after the main body is installed or when the main body is removed and attached to another place.

  In addition, the auxiliary plate can be divided into a plurality of parts, and it is a suction grille characterized in that it can be fixed to the suction grille without overlapping the opening of the air volume adjustment plate, and the auxiliary plate that is not used is stored in the suction grille. It can be easily exchanged when the air volume is changed.

  Further, the blower is characterized in that the round hole has a bell mouth shape, and has an effect that air can be sucked more smoothly and pressure loss can be reduced.

  In addition, the air blower is characterized in that it is provided with two air volume adjusting plates having semicircular cutouts on one side, and the air flow adjusting plates are arranged so that the notches of the air flow adjusting plates face each other. The area of the round hole can be adjusted by adjusting the overlapping degree of the two air volume adjusting plates, and the air volume can be adjusted according to the construction state after the main body is installed.

  In addition, a main body and a suction grille are provided, a blower for blowing air to the main body and an air intake port for taking in air are provided, a suction port for sucking air is provided in the blower, and a ventilation portion and a ventilation portion for ventilating the suction grill are provided. It is equipped with a filter that collects dust, etc. in the cover air, and has a space between the blower and the suction grille. The blower blows air in the order of the filter, then the ventilation section, then the air intake, and then the suction inlet. The air blower is characterized by the fact that the ventilation section is a single round hole that is substantially concentric with the air inlet of the blower. The air volume is adjusted with the blower by making the round hole and the air inlet substantially concentric. An expansion type resonance silencer mechanism is formed by the space between the plate and the noise from the blower can be silenced to reduce the noise.

  In addition, a cylinder that is concentric with the round hole and whose inner diameter is larger than the round hole is a blower characterized by being fixed to the blower in the main body with a gap between the air volume adjustment plate, A Helmholtz resonator having a space between the blower and the air volume adjusting plate as a volume portion and a gap as a throat portion can be formed, and it has an effect that a low frequency noise can be resonated.

  In addition, it is a blower characterized in that the distance of the gap can be adjusted, and by adjusting the distance of the gap, the frequency of the noise that is resonantly silenced according to the frequency distribution of the noise from the blower that changes depending on the construction state is set. It has the effect that it can be adjusted.

  Moreover, it is set as the air blower characterized by including the attachment direction specification means which pinpoints the attachment direction of a suction grill in one direction, and it is the direction which makes the air inlet and the round hole of a blower substantially concentric easily at the time of construction. The suction grill can be attached.

  Further, the mounting direction specifying means is a mark provided on the main body and the suction grille, and the blower is characterized by being easily concentric with the suction port and the round hole of the blower by visual confirmation during construction. It has the effect | action that a suction grille can be attached in the direction which becomes.

  In addition, a plurality of attachment means for attaching the suction grille to the main body are arranged so as not to be point-symmetrical at the center of the outer diameter of the suction grille. It has the effect | action that a suction grille can be attached in the direction which the suction inlet and round hole of a fan are concentric.

  Further, the blower is characterized in that the round hole is located at the center of the outer shape of the suction grille, and the direction in which the suction grille is attached is not limited, and has the effect that the attaching operation can be facilitated.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIGS. 1 to 3, a suction grill 2 used for a ceiling-embedded ventilation fan 1 as a blower is an air intake on the lower surface of a main body 3 (inner dimensions: 305 mm square, height 175 mm) fixed to the ceiling. It is attached so as to cover the inlet 4.

  The main body 3 includes a blower 7 having a bell mouth shape and a suction port 5 having a suction port inner diameter Di of 145 mm and a discharge port 6. The discharge port 6 is arranged on the back of the ceiling and joined to a duct 8 communicating with the outdoors. Yes. The two side surfaces of the main body 3 are provided with a suction port 9 for the slave unit, and are joined to a slave unit duct 11 communicating with the slave unit 10 installed in another room.

  The suction grill 2 includes a grill frame 13 provided with a ventilation portion 12 composed of a plurality of slit-shaped holes, and a 0.8 mm thick air volume adjusting plate 14 fixed to the grill frame 13 so as to cover the ventilation portion 12. The air volume adjusting plate 14 is provided with one round hole 15 located at the center of the outer shape of the suction grill 2 and having a round hole inner diameter D of 120 mm which is 17 mm away from the suction port 5 of the blower 7. At this time, when the suction port 5 and the round hole 15 are projected onto a plane perpendicular to the central axis of the round hole 15, 97.4% of the area of the round hole 15 overlaps with the suction port 5. The suction grill 2 is provided with two springs 16 as mounting means opposite to each other, and the suction grill 2 is fixed to the main body 3 by inserting the spring 16 into a spring receiver 17 provided on the main body 3. ing.

  In the above configuration, when the blower 7 is operated, the air in the room (hereinafter referred to as the main body installation room) in which the ceiling-embedded ventilation fan 1 as a blower is installed is sent to the ventilation section 12 of the suction grill 2 and the air volume adjustment plate 14. The air from the suction port 5 is sucked into the blower 7 through the round hole 15, and the air in the other room where the handset 10 is installed flows into the main body 3 from the handset suction port 9 through the handset duct 11. Then, the air is sucked into the blower 7 from the suction port 5. The air sucked into the blower 7 is discharged from the discharge port 6 to the duct 8 and discharged outdoors. The balance between the amount of air sucked from the main body installation room and the amount of air sucked from the other room can be adjusted by the area of the round hole 15, and if the amount of air sucked from the other room is to be increased, the area of the round hole 15 is reduced. In order to reduce the amount of air sucked from the other room, the area of the round hole 15 may be increased. In this example, if the resistance of the duct for the slave unit is small, suction from the main body installation room and the two other rooms The air volume ratio is 8: 1: 1.

  At this time, since the round hole 15 is opened in the air volume adjusting plate 14, air can be sucked in smoothly, and since there is no corner, generation of turbulence can be suppressed and generation of noise can be suppressed. .

  At the same time, noise generated from the blower 7 is mainly radiated from the suction port 5 to the space 18 between the suction port 5 and the air volume adjusting plate 14 (interval 52 mm). At this time, since the air volume adjusting plate 14 is provided with one round hole 15 substantially concentric with the suction port 5 of the blower 7, an expansion silencer is formed by the suction port 5, the space 18, and the round hole 15. Part of the sound wave of noise incident on the sound is silenced by the action of the silencer, and noise can be reduced.

  Moreover, since the round hole 15 is located in the center of the external shape of the suction grill 2, the direction in which the suction grill 2 is attached is not limited, and attachment work can be facilitated.

  FIG. 4 shows a graph of the spectrum of the sound pressure level (SPL) of noise at a point 1 m away from the suction grill when the round hole 15 is opened in the air volume adjusting plate 14 and when the rectangular hole is opened. The area and center position of the hole, and the operating condition of the blower (rotation speed, air volume, static pressure, etc.) are the same conditions. As shown in the figure, the sound pressure level is reduced at some frequencies in the round hole, and the overall noise level is 41.5 dB for the round hole and 42.9 dB for the rectangular hole, confirming a reduction of 1.4 dB. It was done.

  Note that the frequency at which the sound pressure level is reduced depends on the size of the space, but in order to reduce the noise between 250 Hz and 2 kHz, which is the main cause of noise in a general ventilation fan, the fan 7 and the air volume are reduced as in this example. A space 18 formed by setting the interval between the adjustment plates 14 to about 50 mm may be used. When the interval is narrow, relatively high-frequency noise can be reduced. When the interval is wide, relatively low-frequency noise is reduced. can do.

  In this example, the hole shape of the air volume adjusting plate 14 is a round hole 15. However, even if the corner portion is a polygonal or elliptical hole that does not cause flow resistance or generate turbulent noise. Similar effects can be obtained.

  In this example, the centers of the suction port 5 and the round hole 15 are separated by 17 mm. However, if the air is concentric, the flow of air that is sucked becomes smoother, so that a better noise reduction effect can be obtained.

  Further, if 80% of the area of the round hole 15 overlaps with the suction port, it can be said to be substantially concentric, and the same effect can be obtained.

(Embodiment 2)
As shown in FIG. 5, a plurality of circular lines 19 concentric with the round hole 15 are drawn on the air volume adjusting plate 14. The circular line 19 only needs to be prevented from easily disappearing, and may be drawn with ink or may be drawn with an emboss or a groove.

  If you want to change the balance of the intake air volume from the main unit installation room and the two other rooms, if you measure the influence of the air volume balance due to the size of the area of the round hole 15 of the air volume adjusting plate 14 in advance, the area of the round hole 15 By changing the above, it is possible to achieve a desired air volume balance even after the main body 3 is installed, but with the above configuration, a part of the air volume adjusting plate 14 of the suction grill 2 can be cut out along the circular line 19. The area of the round hole 15 can be accurately changed to the area set by 19. Further, since an additional part for changing the area of the round hole 15 is not required, the cost is reduced.

(Embodiment 3)
As shown in FIG. 6, a plurality of circular lines 19 concentric with the round hole 15 of the air flow adjusting plate 14 are drawn by perforations in which through holes having a length of 3 mm and a width of 1 mm are arranged in a circle with a gap of 1 mm. Yes.

  With the above configuration, a part of the air volume adjusting plate 14 of the suction grill 2 can be cut out along the perforation without using a tool or the like, so that the size of the round hole 15 can be accurately changed.

(Embodiment 4)
As shown in FIGS. 7 and 8, a circular opening 20 having a diameter of 180 mm is opened in the air volume adjusting plate 14, and an auxiliary plate 21 having a round hole 15 is attached so as to cover the opening 20.

  The auxiliary plate 21 can be divided into four auxiliary plate parts 22 and can be fixed to the suction grill 2 at a position that does not overlap the opening 20 of the air volume adjusting plate 14.

  With the above configuration, by preparing several types of auxiliary plates having different areas of the round hole 15, the necessary air volume changes after the installation of the main body 3, or when the main body is removed and installed in another place. The area of the hole 15 can be easily and accurately changed. Further, the auxiliary plate 21 that is not used can be stored in the suction grill 2 and can be easily replaced when the air volume is changed.

(Embodiment 5)
As shown in FIG. 9, the round hole 15 has a bell mouth shape with a cross-sectional radius of 10 mm.

  With the above configuration, air can be sucked more smoothly, pressure loss can be reduced, and noise can be reduced.

(Embodiment 6)
As shown in FIG. 10, two air volume adjusting plates 14 each having a semicircular cutout 23 having a radius of 90 mm on one side are arranged on the suction grill 2 so that the cutout 23 faces each other and a part thereof overlaps. ing. The air volume adjusting plate 14 is provided with three positioning holes 24 in series on both sides facing each other without the notch 23, and the suction grille 2 has positioning protrusions 25 corresponding to the positioning holes 24 on both sides facing the air volume adjusting plate 14, respectively. It has.

  With the above configuration, the degree of overlap of the two air volume adjusting plates 14 can be adjusted by selecting the positioning hole 24 into which the positioning protrusion 25 is inserted, and is formed by the notch 23 of the two air volume adjusting plates 14. Since the area of the round hole 15 can be adjusted, the air volume can be adjusted in accordance with the construction state and the like after the main body is installed.

(Embodiment 7)
As shown in FIGS. 11 and 12, the suction grill 2 is used in a ceiling-embedded ventilation fan 1 with a filter, and is attached so as to cover the air intake 4 of the main body 3. A grille frame 13 provided with a ventilation part 12 facing the suction inlet 5 having a suction inlet inner diameter Di of 145 mm, a filter 26 disposed on the grille frame 13 so as to cover the ventilation part 12, and a filter 26 are covered. A suction panel 27 having a plurality of slit-like holes arranged in such a manner that the ventilation portion 12 of the grill frame is a single one having a round hole inner diameter D of 120 mm away from the suction port 5 of the blower 7 by a center of 17 mm. A round hole 15 is formed.

  With the above configuration, the noise radiated from the suction port 5 of the blower 7 to the space 18 between the suction port 5 and the air volume adjustment plate 14 is such that the round hole 15 of the air flow adjustment plate 14 is substantially concentric with the suction port 5 of the blower 7. Therefore, an expansion-type silencer is formed by the suction port 5, the space 18 and the round hole 15, and a part of the sound wave of noise incident on the space 18 is silenced by the action of the silencer to reduce noise. be able to.

(Embodiment 8)
As shown in FIG. 13, a cylinder 28 concentric with the round hole 15 and having a cylindrical inner diameter Dt of 160 mm and larger than the round hole inner diameter D (145 mm) of the round hole 15 is fixed to the blower 7. A gap h of 15 mm is formed between them.

  With the above configuration, noise radiated from the suction port 5 of the blower 7 is incident on the space 18 between the suction port 5 and the air volume adjusting plate 14 through the gap h. Since the Helmholtz resonance type silencer is formed as a part, noise can be resonantly silenced and noise can be reduced.

(Embodiment 9)
As shown in FIG. 14, the cylinder 28 is a double tube, and the distance h can be adjusted.

  With the above configuration, by adjusting the distance of the gap h, it is possible to adjust the frequency of the noise that is resonantly silenced in accordance with the frequency distribution of the noise from the blower that changes depending on the construction state, thereby reducing the noise.

(Embodiment 10)
As shown in FIG. 15, the mounting direction of the suction grille 2 (hereinafter referred to as regular mounting) in which the round hole 15 is not located at the center of the outer shape of the suction grill 2 and the round hole 15 and the suction port 5 of the blower 7 are substantially concentric. The main body 3 and the suction grill 2 are provided with marks 29 as attachment direction specifying means.

  If the round hole 15 is not located at the center of the outer shape of the suction grill 2, a sufficient noise reduction effect cannot be obtained unless the suction grill 2 is attached in a specified direction. 2 can be mounted in the normal mounting direction.

(Embodiment 11)
As shown in FIG. 16, the mounting direction of the suction grille 2 (hereinafter referred to as regular mounting) in which the round hole 15 is not located at the center of the outer shape of the suction grill 2 and the round hole 15 and the suction port 5 of the blower 7 are substantially concentric. Springs 17 provided on the main body 3 are installed at positions where two springs 16 facing the suction grille 2 as attachment means are not point-symmetric at the center of the outer diameter of the suction grille 2. Also, the position corresponding to the spring 16 is configured.

  By the said structure, the suction grill 2 can be reliably attached in a regular attachment direction at the time of construction.

  The present invention provides a blower capable of adjusting the air volume and attaching / detaching a filter, suppressing the generation of noise during passage of air, reducing the pressure loss of the suction grille, and suppressing the noise. Yes, it can also be used as a ventilation fan such as a ventilation fan equipped with an air volume adjusting plate or a suction filter, and an air conditioner such as an air conditioner.

Side sectional view which shows the air blower of Embodiment 1 of this invention The bottom view which shows the air blower of Embodiment 1 of this invention. The bottom view which shows the relationship between the air volume adjusting plate of Embodiment 1 of this invention, and a main body. The graph which shows the silencing effect of the air blower of Embodiment 1 of this invention The perspective view which shows the air volume adjustment board of the air blower of Embodiment 2 of this invention. The perspective view which shows the air volume adjustment board of the air blower of Embodiment 3 of this invention. The perspective view which shows the air volume adjustment board of the air blower of Embodiment 4 of this invention. The top view which shows the air volume adjustment board of the air blower of Embodiment 4 of this invention. The figure which shows the air volume adjustment board of the air blower of Embodiment 5 of this invention ((a) same side sectional drawing, (b) same same bottom view) The figure which shows the suction grill of the air blower of Embodiment 6 of this invention ((a) Same as the above, perspective view, (b) Same as the above, the enlarged view of the A section) Side sectional view which shows the air blower of Embodiment 7 of this invention The top view which shows the grill frame of the air blower of Embodiment 7 of this invention. Sectional side view which shows the air blower of Embodiment 8 of this invention. Sectional side view which shows the air blower of Embodiment 9 of this invention. The perspective view which shows the air blower of Embodiment 10 of this invention. The perspective view which shows the air blower of Embodiment 11 of this invention. The perspective view which shows the suction grill of the conventional air blower The perspective view which shows the suction grill of the conventional air blower

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ceiling embedded type ventilation fan 2 Suction grill 3 Main body 4 Air intake port Di Suction port inner diameter 5 Suction port 6 Discharge port 7 Blower 8 Duct 9 Slave unit inlet 10 Slave unit 11 Slave unit duct 12 Ventilation part 13 Grill frame 14 Airflow adjustment plate D Round hole inner diameter 15 Round hole 16 Spring 17 Spring receiver 18 Space 19 Circular line 20 Opening 21 Auxiliary plate 22 Auxiliary plate component 23 Notch 24 Positioning hole 25 Positioning projection 26 Filter 27 Suction panel Dt Cylindrical inner diameter 28 Cylinder h Gap 29 Placemark

Claims (15)

A main body and a suction grille; a blower for blowing air to the main body; an air intake port for taking in the air; a suction port for sucking air into the blower; and a ventilation part for ventilating the suction grille and the ventilation An air volume adjusting plate that covers the air volume and adjusts the air volume, the air volume adjusting plate is provided with one round hole, a space is provided between the blower and the air volume adjusting plate, and the air blower of the suction grille is provided by the fan. Then, air is sucked and blown in the order of the round hole of the air volume adjusting plate, then the air inlet, and then the suction port, and the round hole is made substantially concentric with the suction port. apparatus. The blower according to claim 1, further comprising means for adjusting the size of the round hole. The air blower according to claim 1 or 2, wherein a plurality of circles concentric with the round hole of the air volume adjusting plate are drawn. The air blower according to claim 1 or 2, wherein a plurality of circles concentric with the round hole of the air volume adjusting plate are drawn by perforations. The blower according to claim 1 or 2, further comprising an opening and an auxiliary plate attached to the air volume adjusting plate so as to cover the opening and having a round hole. 6. The air blower according to claim 5, wherein the auxiliary plate can be divided into a plurality of parts, and the auxiliary plate can be fixed to the suction grille without overlapping the opening of the air volume adjusting plate. The blower according to claim 1, wherein the round hole has a bell mouth shape. The air volume adjusting plate includes two air volume adjusting plates each having a semicircular cutout on one side, and the air flow adjusting plates are arranged so as to face each other so that the notches of the air flow adjusting plate face each other. Or the ventilation apparatus of 2. A main body and a suction grille; a blower for blowing air to the main body; an air intake port for taking in the air; a suction port for sucking air into the blower; and a ventilation part for ventilating the suction grille and the ventilation A filter that covers dust and collects dust and the like in the air, and has a space between the blower and the air volume adjusting plate. The blower allows the filter, then the vent, and then the air intake. Then, the blower is characterized in that air is sucked and blown in the order of the suction port, and the ventilation portion is a single round hole substantially concentric with the suction port of the blower. 10. The cylinder according to claim 1, wherein a cylinder concentric with the round hole and having an inner diameter larger than the round hole is fixed to a blower in the main body with a gap between the air volume adjusting plate and the air volume adjusting plate. Blower device. The air blower according to claim 10, wherein the distance of the gap can be adjusted. The blower according to any one of claims 1 to 11, further comprising attachment direction specifying means for specifying the attachment direction of the suction grill in one direction. The blower according to claim 12, wherein the attaching direction specifying means is a mark provided on the main body and the suction grille. The air blower according to claim 12, wherein a plurality of attachment means for attaching the suction grille to the main body are arranged so as not to be point-symmetric at the center of the outer diameter of the suction grille. The blower according to any one of claims 1 to 11, wherein the round hole is located at the center of the outer shape of the suction grille.

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