JP2007183060A - Recessed ceiling ventilation fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ceiling-embedded ventilation fan used as a ventilation fan, which has good workability, can be manufactured at low cost, and can insulate and reduce noise radiated from a suction port. The purpose is to do.
SOLUTION: A bell mouth-shaped opening 23 having an opening concentric with the suction opening 7 of the scroll casing 9 and having a diameter equal to or smaller than the diameter of the suction opening 7 in the grill 21 and the suction opening 7 on the outer peripheral side from the opening 23 is provided. By providing the silencer function 24 for noise emitted from the ceiling, it is possible to obtain a ceiling-embedded ventilation fan that has good workability, can be manufactured at low cost, and can insulate and reduce noise emitted from the suction port 7. .
[Selection] Figure 1

Description

  The present invention relates to a ceiling-embedded ventilation fan that is mainly installed on a ceiling and used as a ventilation fan.

  Conventionally, this type of ceiling-embedded ventilation fan has been known in which an orifice different from a suction casing having a bell mouth-like suction port is provided in the opening on the lower surface of the main body (see, for example, Patent Document 1). .

  The ceiling-embedded ventilation fan will be described below with reference to FIG.

  As shown in the figure, a main body 101 having an open lower surface, a motor 104 having an impeller 103 fixed to a top surface 102 in the main body 101, a scroll casing 105 surrounding the impeller 103, and a suction port 106 are provided. A suction casing 107, an orifice 109 having a suction hole 108 that is equal to or smaller than the suction port 106 with a predetermined gap h from the suction casing 107, and a lower end 110 of the suction casing 107 and an end 111 of the orifice 109 with a gap i therebetween. Provided on the lower surface of the orifice 109 is a grill 112 and a discharge port 113 provided on one side of the main body 101.

In the above configuration, when the impeller 103 rotates, the intake air passes from the grill 112 through the suction hole 108 of the orifice 109, enters the impeller 103 through the suction port 106 of the suction casing 107, and is pressurized by the impeller 103. It is discharged from the discharge port 113 through the inside. At this time, the rotational noise generated when the pressure is increased by the impeller 103, the turbulent noise caused by the vortex generated when passing through the scroll casing 105, and the resonance in which the sound generated in the scroll casing 105 is amplified in the volume. Noise is radiated from the suction port 106 to the suction side space 114, but because of the orifice 109, some noise is sound-insulated and silenced and is not radiated to the suction side space 114.
Japanese Patent No. 3279834

  In such a conventional ceiling-embedded ventilation fan, a connection part for electrically connecting the motor 104 and an external power source and an electrical part for storing electrical components are arranged around the scroll casing 105. When work on the electrical parts is required for maintenance, it is necessary to remove the grill 112 and the orifice 109, and there is a problem that workability is poor in construction and maintenance, and workability is reduced without reducing the function of sound insulation and silencer of the orifice. There is a need to improve.

  Further, since the orifice 109 is necessary, there is a problem that the number of parts increases and the manufacturing cost increases, and it is required to add a function of sound insulation and silence at a low cost.

  The present invention solves such a conventional problem, and provides a ceiling-embedded ventilation fan that can be manufactured at low cost with good workability and can insulate and reduce noise radiated from a suction port. The purpose is to do.

  In order to achieve the above object, the ceiling-embedded ventilation fan of the present invention has an electric motor that is connected to an impeller so as to be rotatable around a rotation shaft, and a bell mouth-like suction port that surrounds the periphery of the impeller and is provided on the lower surface. A bell mouth-shaped opening and an opening having a scroll casing and a grill attached to the main body opening on the lower surface of the outer shell so as to cover the main body opening and having a diameter concentric with the suction opening and having a diameter equal to or smaller than that of the suction opening. This is a ceiling-embedded ventilation fan having a silencing function for noise emitted from the suction port on the outer peripheral side from the section.

  By this means, it is possible to obtain a ceiling-embedded ventilation fan that has good workability, can be manufactured at low cost, and can block and reduce noise radiated from the suction port.

  The other means is a ceiling-embedded ventilation fan characterized in that the sound deadening function is a plate-like member on the outer periphery from the opening of the grill.

  By this means, it is possible to obtain a ceiling-embedded ventilation fan that has good workability, can be manufactured at low cost, and can block and reduce noise radiated from the suction port.

  Another means is a ceiling-embedded ventilation fan characterized in that the sound deadening function is a sound-absorbing material installed on the outer periphery from the opening of the grill.

  By this means, it is possible to obtain a ceiling-embedded ventilation fan that has good workability, can be manufactured at low cost, and can block and reduce noise radiated from the suction port.

  Another means is a ceiling-embedded ventilation fan characterized in that the silencing function is a space constituted by a grill, a scroll casing and an outer shell, and a gap between the opening end of the opening and the scroll casing. is there.

  By this means, it is possible to obtain a ceiling-embedded ventilation fan that has good workability, can be manufactured at low cost, and can block and reduce noise radiated from the suction port.

  Another means is that the opening end of the bell mouth-shaped opening of the grill does not protrude toward the main body from a plane perpendicular to the rotation axis passing through the portion of the grill that is closest to the main body. It is a built-in ventilation fan.

  By this means, a grille can be manufactured at low cost, and a ceiling-embedded ventilation fan capable of insulating and reducing noise radiated from the suction port can be obtained.

  Another means is an inner diameter that can include the opening end of the bell mouth-shaped opening of the grill, and a ring-shaped member that is concentric with the opening and has a predetermined axial length is connected to the inlet of the scroll casing and the predetermined opening. It is a ceiling-embedded ventilation fan fixed at intervals.

  By this means, it is possible to obtain a ceiling-embedded ventilation fan that can keep the resonance frequency that is muted regardless of the construction state.

  Another means is a ceiling-embedded ventilation fan comprising grill attachment means at positions corresponding to the grill and the main body opening, respectively, and the attachment direction is uniquely determined by the attachment means. .

  This means that the inlet of the scroll casing and the bell mouth-shaped opening of the grill can be installed without making a mistake, the workability is good, and the ceiling can cut and reduce the noise emitted from the inlet. An embedded ventilation fan is obtained.

  Another means is a ceiling-embedded ventilation fan in which a panel is fixed to the grill so as to cover the opening at a predetermined interval from the grill.

  By this means, the appearance can be improved, and a ceiling-embedded ventilation fan that can further reduce noise due to the effect of sound insulation of the panel can be obtained.

  ADVANTAGE OF THE INVENTION According to this invention, workability | operativity is good, can manufacture at low cost, and can provide the ceiling-embedded type ventilation fan which can insulate and reduce the noise radiated | emitted from a suction inlet.

  According to the first aspect of the present invention, there is provided an electric motor having an impeller connected rotatably about a rotating shaft, a scroll casing surrounding the impeller and having a bell mouth-like suction port on a lower surface, and an outer casing. A grille attached to the bottom body opening so as to cover the body opening, a bell mouth opening having a diameter concentric with the suction opening and having a diameter equal to or smaller than that of the suction opening, and suction from the opening to the outer peripheral side. It is a ceiling-embedded ventilation fan that has a silencing function for noise emitted from the mouth, and since the silencing function is integrated with the grill, the number of parts does not increase by adding the silencing function, In addition, the silencing function can be removed at the same time by removing the grill, so that work on the electrical parts attached near the scroll casing is performed during construction and maintenance. Because, good workability has the effect that can be manufactured at low cost, the noise emitted from the intake port sound insulation can be reduced.

  In addition, it is a ceiling-embedded ventilation fan characterized in that the silencer function is a plate-like member that is the outer periphery from the opening of the grill, and the plate-like member can insulate the noise emitted from the suction port. In addition, since the structure is simple, the function can be manufactured at a low cost.

  Moreover, it is a ceiling-embedded ventilation fan characterized by a sound-absorbing material installed on the outer periphery from the opening of the grille, and can absorb noise radiated from the suction port by the sound-absorbing material. In addition, since the frequency of noise to be reduced can be determined by selecting the performance of the sound absorbing material, the noise radiated from the suction port can be reduced more effectively.

  Further, the silencing function is a ceiling-embedded ventilation fan characterized by a space constituted by a grill, a scroll casing, and an outer shell, and a gap between the opening end of the opening and the scroll casing. The gap forms a resonator, which can mute noise at a frequency specified by the volume of the space and the size of the gap, and because of its simple structure, it has the function of insulating the noise emitted from the suction port. It has the effect that it can be manufactured at low cost.

  An opening fan of a bell mouth-like opening of the grill does not protrude toward the main body from a plane perpendicular to the rotation axis passing through the portion of the grill that is closest to the main body. Thus, the thickness of the grill does not increase even if there is a bell mouth-shaped opening, and therefore it can be manufactured at low cost.

  In addition, a ring-shaped member having an inner diameter that can include the opening end of the bell mouth-shaped opening of the grill, concentric with the opening, and having a predetermined axial length is fixed at a predetermined interval from the inlet of the scroll casing. Since the ring-shaped member is considered to be continuously connected to the bell mouth-shaped opening, the gap between the ring-shaped member and the scroll casing becomes a gap as an expansion resonator, and the grill Because the gap as an expansion resonator, which is a factor that determines the resonance frequency, can be kept constant even in the fixing method in which the ceiling material is sandwiched between the main body and the main body, the resonance frequency to be silenced is made constant regardless of the construction state Has the effect of being able to

  In addition, it is a ceiling-embedded ventilation fan characterized in that it has grill attachment means at positions corresponding to the grill and the body opening, respectively, and the attachment direction uniquely determines the attachment direction of the grill. Since the direction of the inlet of the scroll casing and the position of the bell mouth-shaped opening of the grill can be surely fixed to the regular positions without making a mistake in the direction, the workability can be improved.

  In addition, it is a ceiling-embedded ventilation fan in which the panel is fixed so as to cover the opening at a predetermined interval from the grill on the grill, and the bell mouth-shaped opening of the grill is covered by the panel. The appearance can be improved by applying the appearance design, and the noise can be further reduced by the effect of the sound insulation of the panel.

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

(Embodiment 1)
As shown in FIGS. 1 and 2, the ceiling-embedded ventilation fan 1 according to the first embodiment of the present invention has an inner dimension of 265 mm square and a height of 195 mm within an outer shell 3 of a main body 2 with a rotating shaft 4 as the center. An electric motor 6 connected to a multi-blade type impeller 5 having a diameter of 180 mm so as to be rotatable, and a scroll casing that surrounds the periphery of the impeller 5 and has a suction port 7 and a discharge port 8 having a bell mouth shape and an inner diameter of 150 mm on the lower surface. 9 is provided. A discharge port 8 of the scroll casing 9 communicates with a discharge adapter 11 via a discharge opening 10 provided on one side surface of the outer shell 3. Between the scroll casing 9 and the outer shell 3, there are electrical components such as connection connectors and terminals for electrically connecting the motor 6 and an external power source, a capacitor for driving the motor, and a switch for adjusting the output of the motor 6. The electrical component 12 to be stored is arranged.

  A flange portion 14 is provided on the outer periphery of the lower surface 13 of the outer shell, and the main body 2 is fixed to the ceiling member 16 with a screw or the like through a hole 15 provided in the flange portion 14. For fixing to the ceiling material 16, the flange portion 14 may be on the upper side or the lower side of the ceiling material 16. A duct 17 arranged on the ceiling and communicating with the outdoors is joined to the main body 2 via the discharge adapter 11.

  There is a main body opening 18 on the lower surface 13 of the outer shell 3, and a pair of insertion ports 20 as attachment means 19 are provided at one opposing end of the main body opening 18, and a spring as attachment means 19 provided in the grill 21. By inserting 22 into the insertion port 20, the grill 21 is attached so as to cover the main body opening 18.

  Further, the grill 21 has a bell mouth-like opening 23 having an opening of 145 mm having a diameter equal to or smaller than that of the suction port 7 of the scroll casing 9, and noise emitted from the suction port 7 on the outer peripheral side of the opening 23. And a mute function 24. In this example, the sound deadening function 24 is sound insulation by the plate-like member 25 constituting the grill 21.

  In the above configuration, when the impeller 5 is rotated by the electric motor 6, the intake air passes through the main body opening 18 from the opening 23 of the grill 21, enters the impeller 5 through the suction port 7 of the scroll casing 9, and is boosted by the impeller 5. Then, it passes through the scroll chamber 26 inside the scroll casing 9 and is discharged from the discharge adapter 11 to the duct 17 and discharged outdoors. At this time, the rotational noise generated when the pressure is increased by the impeller 5, the turbulent noise caused by the vortex generated when passing through the scroll casing 9, and the resonance in which the sound generated in the scroll chamber 26 is amplified in the volume. Noise is radiated from the suction port 7 to the suction side space 27.

  At this time, since the diameter of the opening 23 of the grill 21 is equal to or smaller than the diameter of the suction port 7 of the scroll casing 9, part of the noise radiated from the suction port 7 of the scroll casing 9 is part of the opening 23 of the grill 21. Although it is radiated to the outer peripheral side, since there is a plate-like member 25 for sound insulation as the sound deadening function 24, a part of the noise is sound-insulated and is not emitted downward from the grill 21, and the noise can be reduced.

  The diameter of the opening 23 of the grill 21 is equal to or less than the diameter of the suction port 7 of the scroll casing 9, but has a sufficiently large area and has a bell mouth shape for smoothly introducing the suction air. The aerodynamic performance of the ceiling-embedded ventilation fan 1 is not reduced due to pressure loss.

  In addition, since the grille 21 and the silencing function 24 are integrated, the addition of the silencing function 24 does not increase the number of parts and can be manufactured at low cost.

  Moreover, since the muffling function 24 can be removed at the same time by removing the grill 21, the work on the electrical component 12 can be easily performed at the time of construction and maintenance, so that workability can be improved.

  The ceiling-embedded ventilation fan 1 can achieve the same effect even if it is mounted sideways on the wall instead of the ceiling.

(Embodiment 2)
The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. As shown in FIG. 1 and FIG. 2, a plate-like member 25 for insulating a part of noise radiated from the suction port 7 of the scroll casing 9 as a silencing function 24 is provided on the outer peripheral side of the opening 23 of the grill 21. Is provided. In this example, the plate-like member 25 is a 2 mm thick resin molded integrally with the grill 21.

  With this configuration, the noise radiated from the suction port 7 is sound-insulated by the plate-like member 25 of the grill 21, so that the noise can be reduced.

  In addition, the simple structure that can be molded integrally with the grill 21 makes it possible to manufacture a function of insulating noise emitted from the suction port 7 at a low cost.

  In addition, since the sound insulation performance is proportional to the mass of the substance to be sound-insulated, the plate-like member 25 may be a metal or a resin to which metal is added or pasted.

(Embodiment 3)
The same parts as those in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. As shown in FIG. 3, a sound absorbing material 28 for absorbing a part of the noise radiated from the suction port 7 of the scroll casing 9 is provided as a silencing function 24 on the outer peripheral side of the opening 23 of the grill 21. . In this example, a flexible urethane foam having a thickness of 5 mm is affixed to the main body 2 side of the grill 21 for the purpose of absorbing noise of 500 Hz to 1 kHz, which generally occupies a large proportion of the noise radiated from the multiblade fan.

  With this configuration, the noise radiated from the suction port 7 is absorbed by the sound absorbing material 28 of the grill 21, so that the noise can be reduced.

  Further, since the frequency of noise to be reduced can be determined by selecting the performance of the sound absorbing material 28, the main frequency band of noise radiated from the suction port 7 of the scroll casing 9 can be effectively reduced. , The muffling effect can be improved.

  Moreover, in this structure, the part to which the sound absorbing material 28 of the grill 21 is affixed can be made thick so that a sound insulation effect can be added.

(Embodiment 4)
The same parts as those in the first to third embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. As shown in FIG. 4, an expansion type as a silencing function 24 is formed by a resonance space 29 composed of a grill 21, a scroll casing 9 and an outer shell 3, and a gap 31 between the opening end 30 of the opening 23 and the scroll casing 9. A resonator is formed. Here, in a fixed state where the ceiling material 16 is not sandwiched between the grill 21 and the main body 2, the gap is set to 10 mm.

  With this configuration, part of the noise radiated from the suction port 7 of the scroll casing 9 enters the resonance space 29 through the gap 31, but the size of the gap 31 and the volume of the resonance space 29 are based on the principle of the expansion resonator. The noise of the frequency determined by is muted.

  Because of the simple structure that does not require an additional member, it is possible to manufacture a function for silencing noise emitted from the suction port 7 at a low cost.

(Embodiment 5)
The same parts as those in the first to fourth embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. As shown in FIG. 5, the opening end 30 of the grill 21 does not protrude toward the main body 2 from a plane 32 perpendicular to the rotation shaft 4 passing through the outer peripheral portion closest to the main body 2 in the grill 21. .

  With this configuration, the thickness of the grille 21 does not increase even if there is a bell mouth-like opening 23, so that it is not necessary to increase the height of the mold for producing the grille 21 by injection molding, and it is manufactured at low cost. it can.

(Embodiment 6)
The same parts as those in the first to fifth embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. As shown in FIG. 6, a ring-shaped member 33 concentric with the bell mouth-shaped opening 23 of the grille 21 and having an inner diameter of 153 mm and an axial length of 30 mm is connected to the suction port 7 of the scroll casing 9 and 10 mm. It is fixed to the scroll casing 9 via three ribs 34 protruding from the ring-shaped member 33 with a space. The length of the ring-shaped member 33 in the axial direction may be equal to or greater than the thickness of the general ceiling material 16, and in this example, is 30 mm.

  The open end 30 has a thickness of 2 mm and an inner diameter of 145 mm, and the ring-shaped member 33 can include the open end 30.

  With this configuration, when the silencing function 24 is muted by the principle of the expansion resonator, it can be considered that the ring-shaped member 33 is continuously connected to the bell mouth-shaped opening 23, so that the scroll casing 9 and the ring-shaped member 33 It can be regarded as a gap as an expansion resonator whose factor determines the resonance frequency, and the ceiling material 16 can be fixed between the grille 21 and the main body 2 or the fixing method in which the ceiling material 16 is not sandwiched. Even if the thickness of 16 is various, the gap as the expansion resonator is always constant, and the resonance frequency to be silenced can be made constant.

(Embodiment 7)
The same parts as those in the first to sixth embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. As shown in FIG. 7, a pair of insertion ports 20 as attachment means 19 are provided at one opposing end of the main body opening 18, and a spring 22 as the attachment means 19 provided in the grill 21 is provided as the insertion port 20. The grille 21 is attached so as to cover the main body opening 18.

  One of the pair of insertion ports 20 is located near the center of one side of the main body opening 18, and the other is located at one side of the opposite side from the center of the opposite side. The mounting direction of the grille 21 can be uniquely determined.

  Since the scroll casing 9 is spiral, the rotating shaft 4 does not coincide with the center of the main body 2. Therefore, if the mounting direction of the grill 21 is not a normal direction, the inlet 7 of the scroll casing 9 and the opening 23 of the grill 21 are concentric. However, the silencing function 24 is not effective, but with this configuration, the orientation of the suction inlet 7 of the scroll casing 9 and the bell mouth-shaped opening 23 of the grill 21 can be adjusted without any mistake in the direction when the grill 21 is attached. It is possible to fix the position at a regular position uniquely and reliably, and workability can be improved.

(Embodiment 8)
The same parts as those in the first to seventh embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. As shown in FIG. 8, a panel 35 is fixed to the grill 21 so as to cover the opening 23 with an interval of 10 mm. As a design for improving the appearance of the panel 35, the panel 35 is a gently convex quadrangular shape, and the four corners are rounded.

  Since the bell mouth-shaped opening 23 of the grill 21 is covered with the panel 35, the appearance can be improved, and the noise can be further reduced due to the sound insulation effect of the panel 35.

  If the gap between the grill 21 and the panel 35 is small, there is no sufficient inflow area for air to flow in, causing a loss of pressure, reducing the aerodynamic performance of the ceiling-embedded ventilation fan 1, and the grill 21 and the panel 35. If the gap is large, the thickness of the grille 21 including the panel 35 is large and the aesthetic appearance is impaired. Therefore, the gap is set to 10 mm so that the pressure is not lost and the aesthetic appearance is not impaired.

  The present invention provides a ceiling-embedded ventilation fan that has good workability, can be manufactured at low cost, and can block and reduce noise radiated from a suction port.

Side sectional view showing a ceiling-embedded ventilation fan according to Embodiments 1 and 2 of the present invention The perspective view which shows the ceiling embedded type ventilation fan of Embodiment 1, 2 of this invention Sectional side view which shows the ceiling embedded type ventilation fan of Embodiment 3 of this invention Sectional side view which shows the ceiling embedded type ventilation fan of Embodiment 4 of this invention Sectional side view which shows the grill of the ceiling embedded type ventilation fan of Embodiment 5 of this invention Sectional side view which shows the ceiling embedded type ventilation fan of Embodiment 6 of this invention The figure which shows the ceiling embedded type ventilation fan of Embodiment 7 of this invention, (a) Main body front view, (b) Grill perspective view The perspective view which shows the grill of the ceiling embedded type ventilation fan of Embodiment 8 of this invention. Side sectional view showing a conventional ceiling-mounted ventilation fan

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ceiling embedded type ventilation fan 2 Main body 3 Outer shell 4 Rotating shaft 5 Impeller 6 Electric motor 7 Suction port 8 Discharge port 9 Scroll casing 10 Discharge opening 11 Discharge adapter 12 Electrical component 13 Lower surface 14 Flange portion 15 Hole 16 Ceiling material 17 Duct 18 Main body Opening 19 Mounting means 20 Insertion port 21 Grill 22 Spring 23 Opening 24 Silencer function 25 Plate member 26 Scroll chamber 27 Suction side space 28 Sound absorbing material 29 Resonance space 30 Open end 31 Gap 32 Plane 33 Ring-shaped member 34 Rib 35 Panel

Claims (8)

An electric motor having an impeller connected rotatably about a rotation axis, a scroll casing surrounding the impeller and having a bell mouth-like suction port on the lower surface, and a main body opening on the lower surface of the outer shell covering the main body opening And a bell mouth-like opening having an opening concentrically with the suction opening and having a diameter equal to or smaller than that of the suction opening, and is discharged from the suction opening to the outer peripheral side from the opening. Built-in ceiling ventilation fan with a function to mute noise. 2. The ceiling-embedded ventilation fan according to claim 1, wherein the silencing function is a plate-like member located on the outer periphery from the opening of the grill. 3. The ceiling-embedded ventilation fan according to claim 1, wherein the sound deadening function is a sound absorbing material installed on the outer periphery from the opening of the grill. 4. The ceiling-embedded type according to claim 1, wherein the silencing function is a space formed by a grill, a scroll casing, and an outer shell, and a gap between the opening end of the opening and the scroll casing. Ventilation fan. The opening end of the bell mouth-shaped opening of the grill does not protrude toward the main body from a plane perpendicular to the rotation axis passing through the portion of the grill that is closest to the main body. The ceiling-mounted ventilation fan described in 1. A ring-shaped member having an inner diameter that can include the opening end of the bell mouth-shaped opening of the grill, concentric with the opening, and having a predetermined axial length is fixed at a predetermined interval from the inlet of the scroll casing. The ceiling-embedded ventilation fan according to any one of claims 1 to 5. The ceiling embedding according to any one of claims 1 to 6, further comprising mounting means for mounting the grill at positions corresponding to the grill and the main body opening, respectively, wherein the mounting means uniquely determines the mounting direction of the grill. Shaped ventilation fan. The ceiling-embedded ventilation fan according to any one of claims 1 to 7, wherein a panel is fixed to the grill so as to cover the opening at a predetermined interval from the grill.

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