JPH08166141A - Air handling unit - Google Patents

Abstract

PURPOSE: To lower noise both on the feed air side and on the circulation side of a system type air handling unit. CONSTITUTION: A silencing mechanism 3 is mounted on the delivery side of an air fan 2 to lower noise from an air supply opening 4. The noise on the circulation side is lowered by employing an exhaust fan system. In other words, the noise on the circulation side can be lowered by combining a lower absolute noise value of an exhaust fan 10 and a reduction in noise with a path to a circulation opening 8 from the exhaust fan 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system type air handling unit which can perform air conditioning control operation with a single unit of supply air, return air, introduction of outside air and exhaust.

[0002]

2. Description of the Related Art In recent years, demands for noise reduction in air handling units used in air conditioning equipment have become increasingly strict.

Conventionally, this type of air handling unit has generally been constructed as shown in FIGS. 7 and 8. The configuration will be described below with reference to FIGS. 7 and 8.

As shown in the figure, an air supply fan 102 attached to the air supply opening 101 and a cold / hot water coil 103 are installed in an air supply side body 104, and a return air opening 105 and a return air fan 106 are provided. A return air damper 108 and a filter 109 are installed inside the return air side body 107. The return air side body 107 has an outside air opening 110, an exhaust opening 117, an outside air damper 112, and an exhaust damper 11.
3 is provided. Further, the air supply side body 104 and the return air side body 107 are integrally connected.

In the above structure, when the air supply fan 102 and the return air fan 106 rotate, the return air from the room is
Divided into circulating air and exhaust air, return air damper 10
8 and the exhaust damper 113. On the other hand, the outside air introduced from the outside air damper 112 is mixed with the circulating air, purified by the filter 109, cooled, heated or cooled by the hot water coil 103, and then blown into the room by the air supply fan 102.

[0006]

In such a conventional air handling unit, the noise generated by the air supply fan 102 is directly caused by the air supply opening 101 and the return air opening 10.
It will be discharged indoors through a duct or the like connected from 5. In order to prevent this, it was common to install a muffler in the middle of the duct on the air conditioning work side. However, installing such a silencer on the construction side such as a duct causes an increase in duct space and an increase in construction cost.
Recently, it has also been practiced to incorporate a muffler in the air handling unit. However, in the system type air handling unit having the return air fan 106 and the air supply fan 102 built-in, in order to reduce the noise on both the air supply side and the return air side, a muffling device is required for each, and the air handling unit is required. Increase in unit volume,
It was difficult to achieve because it would increase costs. The present invention solves the above problems, and a first object thereof is to reduce the noise on the supply air side and the noise on the return air side without increasing the volume of the air handling unit and increasing the cost.

A second object is to enhance the silencing effect of the silencing mechanism provided on the air supply side and to increase the degree of freedom of the air supply opening.

A third object is to reduce the pressure loss in the sound deadening mechanism.

[0009]

A first means for achieving the first object of the present invention is to provide a supply fan having an air supply fan for supplying air into a room in a machine, in which a cold coil, a hot water coil and the like are arranged. It consists of an air-side airframe and an exhaust-side airframe that has a return air inlet for introducing return air from the room and has an exhaust fan that discharges part of this return air, and that has a filter, damper, control panel, etc. The silencer is integrally built into the machine on the discharge side of the air supply fan.

A second means for achieving the second object has a straight pipe muffler duct section for directly connecting the muffling mechanism to the air supply fan, and an air supply opening section connected to the muffler duct section. It is composed of a muffling chamber section.

Further, a third means for achieving the third object is such that the straight pipe duct portion of the sound deadening mechanism is tapered so that its cross-sectional area increases from the discharge side of the air supply fan. is there.

[0012]

According to the present invention, the noise of the air supply fan is reduced by the silencing mechanism and the noise of the return air port is reduced by the use of the exhaust fan by the structure of the first means.

Further, according to the structure of the second means, the noise from the air supply fan is first muted in the straight pipe muffling duct section, and is further muffled in the muffling chamber section.

Further, according to the constitution of the third means, the wind speed from the air supply fan is gradually decelerated in the tapered sound-deadening duct to reacquire the static pressure and the pressure loss is reduced due to the decrease in the wind speed. It will be possible.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. As shown in the figure, an air supply fan 2 is installed inside the air supply side body 1, a straight pipe muffling duct-like muffling mechanism 3 is attached to the discharge side of the air supply fan 2, and an air supply opening 4 is provided at the upper part. Is provided. Further, on the upstream side of the air supply fan 2, cold, hot water coil 5, humidifier 6 are provided.
Is installed. On the other hand, the exhaust side body 7 connected to the air supply side body 1 is directly connected to the return air opening 8 for introducing return air from the room, the outside air opening 9 for taking in outside air, and the discharge port of the exhaust fan 10 inside. It has an exhaust opening 11 that allows the return air damper 12, the outside air damper 13,
An exhaust damper 14 is provided, and a filter 15 and a control panel 16 are installed.

With the above structure, the noise on the discharge side of the air supply fan 2 is reduced by the muffling mechanism 3. On the other hand, the noise from the return air opening 8 is the same as the noise from the air supply fan 2 and the exhaust fan 1
Although the noise from 0 is combined, the noise from the air supply fan 2 is obtained by adding the noise reduction due to the route inside the body and the noise reduction due to the cold and hot water coils 5, the filter 15, and the like. On the other hand, the noise from the exhaust fan 10 is smaller in absolute value than the noise of the conventional return air fan. (This is the basic difference between the return air fan system and the exhaust fan system. It is well known that the loss of the exhaust fan system is small, and therefore the power of the fan is small and the noise generation is small at the same exhaust amount). Since the in-flight path from the air to the return air opening 8 can be long, the sound reduction effect can be increased during this time. Therefore, the noise from the return air opening 8 can be reduced as compared with the conventional case.

Next, a second embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG.

As shown in the figure, a straight pipe muffler duct 3a directly connected to the air supply fan 2 and a muffler chamber 3b directly connected to the muffler side body are provided above the air supply side body. The air supply opening 4 is
It is provided in the muffling chamber.

With the above structure, the noise on the discharge side of the air supply fan 2 is first reduced by the straight pipe muffling duct 3a, and further reduced by the muffler chamber 3b which is directly connected. be able to. Further, since the muffling chamber 3b is incorporated in the upper portion of the air supply side machine body 1, the air supply opening 4 can be provided not only on the upper surface of the machine body, but also on the side surface or the like, which increases the degree of freedom in duct construction. It will be.

Next, a third embodiment of the present invention will be described with reference to FIGS. As shown in the figure, the shape of the straight pipe muffler duct 3a directly connected to the air supply fan 2 is connected to the muffler chamber 3b as a tapered tubular muffler duct 3c whose cross-sectional area is gradually increased from the connection side of the air supply fan 2. There is.

With the above structure, the velocity of the air discharged from the air supply fan 2 is gradually reduced, and the dynamic pressure component is converted to static pressure (static pressure reacquisition). Further, since the dynamic pressure component is reduced, it is possible to reduce the pressure loss in the connection portion to the muffling chamber and the pressure loss in the air passage.

Although the embodiment does not show the outside air treatment type in which the total heat exchanger is incorporated in the exhaust side body, it is clear that it has the same action and effect.

[0023]

As is apparent from the above embodiments, according to the present invention, the noise on the discharge side of the air supply fan is reduced by the muffling mechanism, and the noise on the return air side adopts the exhaust fan system. Therefore, it is possible to provide an air handling unit that can reduce the supply air and return air with low noise.

Further, by providing the sound deadening mechanism as a superposed structure of the straight pipe sound deadening duct and the sound deadening chamber, it is possible to provide an air handling unit having a further improved sound deadening effect.

Further, it is possible to provide an air handling unit having an effect of reducing pressure loss by tapering the sound deadening duct.

[Brief description of drawings]

FIG. 1 is a front view showing the configuration of an air handling unit according to a first embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is the same front view of the second embodiment.

FIG. 4 is a side view of the same.

FIG. 5 is a front view of the same third embodiment.

FIG. 6 is a side view of the same.

FIG. 7 is a front view showing the configuration of a conventional air handling unit.

FIG. 8 is a side view of the same.

[Explanation of symbols]

 1 Air supply side body 2 Air supply fan 3 Silence mechanism 5 Cooling and hot water coil 6 Humidifier 7 Exhaust side body 8 Return air opening 10 Exhaust fan 12 Return air damper 13 Outside air damper 14 Exhaust damper 15 Filter

Claims (3)

[Claims] 1. An air supply fan for supplying air to the room is provided inside the machine, and an air supply side body in which a cold, hot water coil, a humidifier, etc. are arranged, and a return air opening for introducing return air from the room. An exhaust fan for discharging a part of this return air was provided, and it consisted of an exhaust side airframe in which filters, dampers, control panels, etc. were arranged, and a muffling mechanism was integrated into the inside of the machine on the discharge side of the air supply fan. Air handling unit. 2. The air handling unit according to claim 1, further comprising a straight pipe muffler duct section directly connecting the muffling mechanism to the air supply fan, and a muffler chamber section having an air supply opening connected to the muffler duct section. 3. The air handling unit according to claim 1, wherein the straight pipe muffler duct portion has a tapered shape whose cross-sectional area increases from the discharge side of the air supply fan.