JP2001038127A - Filter unit provided with fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a filter unit to be operated in more quiet state by reducing operation noise. SOLUTION: In this filter unit 1, at least a fan 3, a maffler 4 and a filter 5 are incorporated in a main body casing 2. The air sucked into the main body causing 2 from a suction port 6 by the fan 3 is purified by being passed through the maffler 4 and the filter 5 and discharged to the outside of the main body casing 2 from a blow-off port. In this case, a rectification maffler chamber 23 is formed between the fan 3 and the maffler 4 in the main body casing 2. In this way, the air discharged from a discharge port 16 of the fan 3 is introduced into the maffler 4 after being rectified by the flow regulating sound- absorbing chamber 23, then the air almost uniformly flows through the maffler to enhance the sound-absorbing effect of the maffler 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter unit with a fan for purifying and discharging air sucked by a fan with a filter.

[0002]

2. Description of the Related Art Such a filter unit with a fan is used in an operating room of a hospital, an ICU (intensive care unit), a clean room of a semiconductor manufacturing factory, and the like. Conventionally, a silencer and a sound absorbing material have been used.

FIG. 6 shows a part of a conventional filter unit with a fan. In FIG.
Reference numeral 4 denotes a muffler having a rectangular duct shape, and a sound absorbing material 119 is stretched on the inner wall of the muffler 104.

The air sucked in the axial direction (lateral direction) from the suction port 103a of the fan 103 is directly discharged from the discharge port 103b of the fan 103 to the muffler 104,
After the noise component is removed by the sound absorbing effect of the sound absorbing material 119 in the process of flowing through the muffler 104, the noise component is removed, and the air is purified by passing through a filter (not shown) and discharged out of the unit through the outlet 126.

[0005]

However, in the conventional filter unit with a fan, the fan 103
The silencer 104 is directly connected to the outlet 103 of the fan 103.
3b is directly introduced into the silencer 104, the flow velocity of the air flowing in the silencer 104 locally increases, the air does not flow uniformly, and the operation noise of the fan 103 is reduced. Since the sound absorbing material 119 does not sufficiently attenuate the noise, there is a limit in suppressing the unit noise.

Further, since the discharge port 103b of the fan 103 is close to the outlet 126 of the unit, the noise of the air discharged from the fan 103 is easily transmitted, which has been a factor that hinders the noise reduction of the unit.

Particularly, in a clean room in a hospital, there is a strong demand for low noise, and when a plurality of units are connected for operation, there is a problem that the operation noise is combined to generate a loud noise. The demand for noise reduction has been increasing in recent years.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a filter unit with a fan that can suppress operating noise and reduce noise.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, at least a fan, a silencer, and a filter are built in a main body casing, and the fan sucks the air from a suction port into the main body casing. In a filter unit with a fan that purifies air by discharging the air that has passed through the muffler and the filter and discharging the air from the outlet to the outside of the main body casing, a rectifier is provided between the fan and the muffler in the main body casing. A muffle chamber is formed.

According to a second aspect of the present invention, in the first aspect of the present invention, a sound absorbing material is stretched on an inner wall of the rectifying silencing chamber.

According to a third aspect of the present invention, in the first aspect of the present invention, the fan is constituted by a turbo fan, and a discharge port thereof is opened on an upstream side of the rectifying silencing chamber.

According to a fourth aspect of the present invention, in the first, second or third aspect of the present invention, the fan is provided with two discharge ports, and the air discharged from the fan is divided into two to rectify and muffle the sound. It is characterized in that it is led to the chamber.

According to a fifth aspect of the present invention, in the fourth aspect of the invention, after air is discharged in the left-right direction from the two discharge ports of the fan, each air flow is bent at a right angle to the rectifying muffle chamber. It is characterized by being guided.

Therefore, according to the first aspect of the present invention, since the rectifying silence chamber is formed between the fan and the muffler in the main body casing, the air discharged from the outlet of the fan is rectified by the rectifying silence chamber. After being introduced into the muffler, the air flows in the muffler substantially uniformly, and the muffling effect of the muffler is enhanced. Also, since the rectifying silencing chamber is interposed between the fan and the silencer, the outlet of the fan moves away from the outlet of the main body casing,
Since the rectifying silencing chamber also functions as a sound insulating wall, transmitted noise generated from the fan can be suppressed low.

According to the second aspect of the present invention, since the sound absorbing material is stretched on the inner wall of the rectifying silence chamber, the rectifying silencing chamber also functions as a silencer, and the rectifying silence chamber and the silencer have a double silencing effect. This further promotes noise reduction of the unit.

According to the third aspect of the present invention, the fan is constituted by a turbo fan, and its discharge port is opened upstream of the rectifying silencing chamber, so that the flow path of the air discharged from the discharge port of the fan is long. Therefore, the operating noise of the fan is sufficiently attenuated by the muffler and the sound absorbing material, and the noise of the unit is suppressed to a low level.

According to the fourth aspect of the present invention, the fan is
Since two discharge ports were provided, the air discharged from the fan was divided into two and led to the rectification silencing chamber,
The flow velocity and the resistance of the air introduced into the rectification silencing chamber are suppressed low, and the rectifying effect of the air in the rectification silencing chamber is enhanced.

According to the fifth aspect of the invention, the fan 2
After the air is discharged from one of the discharge ports in the left-right direction, each air flow is bent at a right angle to be guided to the rectification silencing chamber, so that the energy loss due to the bending of the air flow increases and the noise attenuation effect is enhanced.

[0019]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view in which a filter unit with a fan according to the present invention is partially cut away, FIG. 2 is a side sectional view of the filter unit, FIG. 3 is a perspective view showing an internal structure of the filter unit, and FIG. FIG. 2 is an exploded perspective view showing a component configuration of the filter unit.

The filter unit 1 with a fan according to the present invention is constructed by incorporating a fan 3, a silencer 4 and a filter 5 in a main body casing 2 formed of a sheet metal into a rectangular box shape.

Incidentally, the front surface of the main body casing 2 (FIG. 1)
As shown in FIG. 1, a rectangular suction port 6 that is long in the width direction is opened at the left end face of FIG. 2), and a suction flange 7 is mounted around the suction port 6. And
The fan 3 is provided at the center in the width direction inside the suction port 6 in the main body casing 2. As shown in FIG. 2, a sound absorbing material 8 made of glass wool is provided on a wall surface except a bottom surface of the space in front of the fan 3 in the main body casing 2, and a maintenance opening 9 on the bottom surface is detachable. Panel 10.

The fan 3 is constituted by a centrifugal turbo fan, and the fan 3 is a fan motor 11 serving as a driving source.
Is directly connected to the output shaft 11a. A flow path 12 is provided around the fan 3 for dividing the air sucked from the suction port at the center of the front surface of the fan 3 into two left and right directions.
A scroll body 12 formed by forming a and 12b is installed (see FIG. 4). The scroll body 12 is integrally formed of a sound absorbing material such as styrene foam, glass wool, or the like. The scroll body 12 is fitted into a U-shaped bottom plate 13 made of sheet metal as shown in FIG. Covered.

As shown in FIG. 4, a rectangular hole 1 is formed at the center in the width direction of the scroll body 12 and the bottom plate 13.
The fan motor 11 penetrates the rectangular holes 12c and 13a, and the penetrating portion is supported by a rectangular frame-shaped motor base 15 attached to the back surface of the bottom plate 13. I have.
And both side surfaces of the bottom plate 13 are side panels 1
The side panels 16 are respectively formed with rectangular openings 16a opening to the flow paths 12a and 12b formed in the scroll body 12, and these openings 16a Discharge port. And, in each side panel 16,
A sight cover 17 made of sheet metal and bent in an L-shape to prevent backflow of air to the fan 3 side is attached.

Further, an opening 14a is formed in the center of the upper plate 14, and this opening 14a
The inlet ring 18 is attached to the periphery of the. The inlet of the fan 3 faces the opening 14a of the upper plate 14.

On the other hand, the silencer 4 is formed in a rectangular duct shape, and is disposed at the center in the width direction behind (to the right in FIGS. 1 and 2) the fan 3 in the main body casing 2. As shown in FIG. 2, glass wool sound absorbing materials 19 and 20 are stretched over the inner and outer walls, respectively.

Thus, in the filter unit with a fan 1 according to the present embodiment, between the fan 3 and the muffler 4 in the main body casing 2, two front and rear partition panels 21 arranged in parallel with each other. , 22 form a rectifying silencing chamber 23 over the entire width, and a sound absorbing material 24 made of glass wool is stretched on the inner wall of the rectifying silencing chamber 23.

A rectangular opening 21a is formed on both sides (portions protruding left and right from both sides of the bottom plate 13) of one (front side) of the partition panel 21 which defines the rectification silencing chamber 23, A rectangular opening 22a is formed at the center of the other (rear side) partition panel 22 in the width direction, and the muffler 4 opens to the rectification muffle chamber 23 through this opening 22a. The rear end face of the muffler 4 is open in the main casing 2, and a sound absorbing material 25 made of glass wool is provided on the inner wall of the space for accommodating the muffler 4 in the main casing 2 as shown in FIG. 2. Have been.

The filter 5 is installed horizontally below the muffler 4 in the main casing 2, and the outlet 2 is provided below the filter 5 in the main casing 2.
6 is opened, and the outlet 26 is covered by a detachable punching panel 27 having a number of small holes. As shown in FIG. 2, the filter 5 is mounted and supported on a support plate 30 by a filter press fitting 28 and a plurality of bolts 29.

The filter unit 1 with a fan having the above-described configuration is incorporated in, for example, a ceiling of an operating room of a hospital and is used for purifying air in the room. Will be described below.

In the filter unit with fan 1 according to the present invention, when the fan 3 is driven to rotate by the fan motor 11 in the direction indicated by the arrow in the drawing, the indoor air flows from the suction port 6 opening to the front of the main body casing 2.
After the introduced air is sucked into the fan 3 from the inlet ring 18 and pressurized, the air flows along the flow paths 12a and 12b formed in the scroll body 12 as shown by arrows in FIG. The liquid is discharged from each of the discharge ports 16a formed in the left and right side panels 16 after being divided into two sides.

The air discharged from each of the outlets 16a of the left and right side panels 16 changes the flow direction to a right angle rearward, flows into the rectification silencing chamber 23 from the left and right openings 21a of the partition panel 21, and the rectification is performed. Silencer chamber 23
After being rectified and silenced by the air, the air merges and the merged air is introduced into the muffler 4 through an opening 22 a formed in the partition panel 22.

As described above, the air discharged to the left and right from the left and right discharge ports 16a of the fan 3 is rectified in the rectification and silence chamber 23 and then introduced into the muffler 4, so that the air is silenced. It will flow substantially uniformly in the vessel 4. As a result, the silencing effect of the silencer 4 is enhanced, and the operating noise of the fan 3 is sufficiently attenuated in the silencer 4. Then, in this case, the air discharged from the fan 3 is divided into two and guided to the rectification muffle chamber 23, so that the flow velocity and the resistance of the air introduced into the rectification muffle chamber 23 are suppressed low, and the air in the rectification muffle chamber 23 is reduced. The air rectification effect is enhanced.

In the present embodiment, the air is discharged from the two discharge ports 16a of the fan 3 in the left-right direction, and then the respective air flows are bent at right angles to be guided to the rectification silencing chamber 23. Energy loss due to the bending of the flow is increased, and the noise damping effect is enhanced.

Further, in the present embodiment, since the sound absorbing material 24 is also provided on the inner wall of the rectifying sound deadening chamber 23,
The rectifying silencing chamber 23 also functions as a silencer, and the silencing of the filter unit with fan 1 is further promoted by the double silencing effect of the rectifying silencing chamber 23 and the silencer 4.

The air whose noise energy (vibration component) has been attenuated in the process of flowing through the muffler 4 flows out of the rear end of the muffler 4 into the main body casing 2 and then passes through the filter 5 downward. It is purified by passing. The air that has been purified by passing through the filter 5 is blown into the room through a small hole of a punching panel 27 from an outlet 26 that opens at the bottom of the main casing 2.

By repeating the above series of operations continuously, a high degree of cleanliness is maintained in a clean room such as an operating room of a hospital. However, in the filter unit with fan 1 according to the present embodiment, Since the rectifying muffler chamber 23 is interposed between the fan 3 and the muffler 4 in the housing 2, the discharge port 16 a of the fan 3 moves away from the outlet 26 of the main body casing 2 and the rectifying muffler chamber 23 is defined. Since the components 21 and 22 also function as sound insulation walls, the transmitted noise generated from the fan 3 can be suppressed low.

In this embodiment, a rectifying silencing chamber 23 is interposed between the fan 3 and the silencer 4 in the main body casing 2 and the discharge port 16a of the fan 3 is provided.
Is opened on the upstream side of the rectifying silence chamber 23, the flow path of the air discharged from the discharge port 16a of the fan 3 becomes longer, and the operating noise of the fan 3 reduces the rectifying silence chamber 23, the silencer 4, the sound absorbing material 19, 20, 24, 25
Thus, the operating noise of the filter unit with fan 1 is suppressed to a low level. In this embodiment, the operating noise of the filter unit with fan 1 was reduced from 45 dB (A) to 40 dB (A).

By the way, the filter unit with the fan having only the air cleaning function has been described above. However, in the present invention, for example, a heat exchanger 31 is provided inside the suction port 6 in the main body casing 2 as shown in FIG. It is needless to say that the filter unit with fan 1 ′ having the air conditioning function is also included in the application object. FIG. 5 is a side sectional view of a filter unit with fan 1 'according to another embodiment.
In the figure, reference numeral 32 denotes a drain pan. In FIG. 5, the same elements as those shown in FIG. 2 are denoted by the same reference numerals.

In the above embodiment, a turbo fan is used as a fan, but any other type of fan, such as a sirocco fan, can be used.

[0041]

As is apparent from the above description, according to the present invention, at least a fan, a silencer and a filter are built in the main body casing, and the air sucked into the main body casing from the suction port by the fan is provided. In a filter unit with a fan for purifying air by passing the muffler and a filter and discharging the air from an outlet to the outside of a main body casing, a rectifying muffling chamber is formed between the fan and the muffler in the main body casing. As a result, an effect is obtained that the operating noise of the filter unit with the fan can be suppressed to be low and the noise can be further reduced.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a filter unit with a fan according to the present invention.

FIG. 2 is a side sectional view of a filter unit with a fan according to the present invention.

FIG. 3 is a perspective view showing an internal structure of a filter unit with a fan according to the present invention.

FIG. 4 is an exploded perspective view showing a component configuration of a filter unit with a fan according to the present invention.

FIG. 5 is a side sectional view of a filter unit according to another embodiment of the present invention.

FIG. 6 is a partial perspective view of a conventional filter unit with a fan.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1 'Filter unit with fan 2 Main body casing 3 Fan 4 Silencer 5 Filter 6 Inlet 16 Side panel 16a Discharge port 21, 22 Partition panel 23 Rectifying silence chamber 24 Sound absorbing material 26 Air outlet

Claims (5)

[Claims] At least a fan, a muffler, and a filter are built in a main body casing, and air sucked into the main body casing from an intake port by the fan passes through the muffler and the filter, and is blown out of the main body casing from an outlet. A filter unit with a fan for purifying air by discharging air to the fan, wherein a rectifying silence chamber is formed between the fan and the silencer in the main body casing. 2. The filter unit with a fan according to claim 1, wherein a sound absorbing material is provided on an inner wall of the rectifying silencing chamber. 3. The filter unit with a fan according to claim 1, wherein said fan is constituted by a turbo fan, and a discharge port thereof is opened on an upstream side of said rectifying silencing chamber. 4. The fan according to claim 1, wherein two outlets are provided in the fan, and the air discharged from the fan is divided into two to guide the air into the rectification silencing chamber. Filter unit with fan as described. 5. The air blower according to claim 4, wherein air is discharged from the two discharge ports of the fan in the left-right direction, and then each air flow is bent at a right angle to be guided to the rectification silencing chamber. Filter unit with fan.