JPH0228346Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is applicable to buildings such as buildings.
This invention relates to a so-called central air conditioning system (air handling unit) in which an air conditioning system for heating or cooling air sent to each room is installed in a machine room of the building.

[Conventional technology]

This type of central air conditioner consists of a heat exchanger for heating or cooling air, a blower for sending conditioned air to each room of the building, etc., in one unit. The problem with this central air conditioner is that the noise generated by the blower and the noise generated when air passes through the air conditioning heat exchanger are The objective is to reduce the propagation of air to each room via the return duct of air from each room to the air conditioner and the blow duct of air from the air conditioner to each room.

Therefore, in the past, the propagation of noise in each room was reduced by making the return duct and the ventilation duct into a special shape, or by providing a muffler in the middle of the return duct and the ventilation duct. There is.

[Problem that the invention attempts to solve]

However, creating a special shape in the middle of the return duct and ventilation duct, or installing a silencer in the middle of the return duct and ventilation duct,
Since the shapes of the return duct and the air duct are complicated, it takes a lot of effort to install the ducts and increases the cost of installing the ducts.Furthermore, there are special shaped parts in the middle of the two ducts in places other than the machine room. Space must be secured to install the silencer.

Furthermore, providing a specially shaped part or a muffler in the middle of the return duct and the blower duct significantly increases the air flow resistance in both ducts, so a centrifugal blower with high discharge pressure is required as the blower. It must be used.

However, centrifugal blowers produce extremely loud noise in the low frequency range, and it is much more difficult to muffle this low frequency noise than to muffle high frequency noise. If the space is adjacent to a machinery room equipped with a central air conditioner using a centrifugal blower, the partition wall that separates the machinery room from the office, etc. may be made of heavy sound insulating material such as concrete. , the partition wall that separates the machine room where the central air conditioner will be installed and the office, etc. must be constructed with multiple sound insulation structures.
Constructing a heavy sound insulation wall or a multiple sound insulation structure wall is
The space in the machine room will only increase accordingly.
The significant increase in weight of sound insulating walls necessitates a more robust foundation, leading to an increase in construction costs, especially in the case of high-rise buildings.

Furthermore, using a centrifugal blower increases the size of the air conditioner and increases the power required to drive the blower, increasing operating costs.

The present invention aims to reduce the noise, size, and weight of such a central air conditioner, and reduce the required power.

[Means to solve the problem]

Therefore, in the present invention, an axial blower and an air conditioning heat exchanger are provided in a casing made of sound-deadening panels, and an air intake port and an air outlet are provided in the casing made of sound-deadening panels. and,
In the casing, an air path is formed in which the air taken in from the air intake port passes through the air conditioning heat exchanger, an axial blower, and the air outlet;
The air passage is configured to include an intake silencer between the air intake port and the air conditioning heat exchanger, and a discharge silencer between the axial blower and the air outlet. .

[Functions and effects of the idea]

In this configuration, the air blown to each room in the building enters the air path inside the box-shaped casing from the air intake port by suction from the axial blower.
After being heated or cooled in the air conditioning heat exchanger and increasing the pressure in the axial flow blower, the air flows out from the air outlet.
Air is blown to each room in the building.

In this case, by covering the entire blower and air conditioning heat exchanger with a casing made of sound-absorbing panels, the noise generated by the blower and the noise generated when air passes through the air conditioning heat exchanger are directed to the outside. While the propagation of these noises can be reduced, these noises can be suppressed by an intake silencer provided between the air conditioning heat exchanger and the air intake port, and a discharge silencer provided between the blower and the air outlet. Since the noise is muffled, it is possible to reliably reduce the noise propagated to each room in the building via the return duct connected to the air intake and the ventilation duct connected to the air outlet.

Moreover, by providing the intake silencer and the discharge silencer within the casing, the flow resistance when air passes through the two silencers can be reduced by providing a specially shaped part or a muffler in the middle of both ducts, unlike the conventional method. Therefore, there is no need to use a centrifugal blower, and instead an axial blower, which generates less low-frequency noise and requires less power than a centrifugal blower, can be used instead. It can be used.

Therefore, according to the present invention, by using an axial flow type blower, the low frequency noise generated by the blower can be reduced;
The sound-absorbing panel casing that covers the entire blower and air conditioning heat exchanger, and the ability to reduce the propagation of noise to the outside by the intake silencer and discharge silencer installed inside the casing, combine to reduce the propagation of noise to the outside. Low noise can be achieved reliably.

By using an axial flow type blower that generates less low-frequency noise, the sound insulation performance of the partition wall that separates the machine room from offices and conference rooms has been improved by reducing the low-frequency noise that was previously achieved. Since there is no need to make the air conditioner high enough to block the air, the construction cost of the building can be reduced, and in some cases, the central air conditioner can be installed in a corner of a room such as an office.

The axial blower used here is smaller and smaller than the centrifugal blower used in the past.
Since it is lightweight and requires less power, the entire central air conditioner can be made smaller and lighter, and operating costs can be reduced.

By installing the intake silencer and discharge silencer inside the casing that covers the entire blower and air conditioning heat exchanger, the ducts connecting the central air conditioner and each room can be simplified, making it easier to install ducts. Costs can be reduced and the space required for installing the duct can be reduced.

It has the following effects.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawing, reference numeral 1 indicates a box-shaped casing that covers the entire central air conditioner, and surrounding side plates 2, 3, 4, 5 of the casing 1, The floor boards 6, and the ceiling boards 7 are all composed of sound-absorbing panels made by filling a sound-absorbing material between an outer sound-insulating board and an inner perforated board. There is a door 8 made of a sound-absorbing panel that can be opened and closed for internal inspection, and the other side panel 3 has an air intake port 9.
However, each ceiling plate 7 is provided with an air outlet 10, and the air intake port 9 is provided with an intake filter 11.
is provided.

In the casing 1, an intake silencer 12 is provided adjacent to the air intake port 9.

In the illustrated embodiment, the intake silencer 12 includes a plurality of sound absorbing plates 12a, which are constructed by filling a sound absorbing material 12c between two perforated plates 12b, 12b.
Although this is a splitter type in which the air inlets are arranged parallel to the air flow flowing in from the air intake port 9, a honeycomb cell type may also be used.

Further, in the casing 1, an air conditioning heat exchanger 13 is disposed downstream of the intake silencer 12.
are provided in an inclined manner with respect to the air flow from the air intake port 9, and a humidifier 14 is also provided.

Furthermore, inside the casing 1, an axial blower 15 is installed at a portion adjacent to the air conditioning heat exchanger 13.
is disposed such that the suction side of the blower 15 communicates with the downstream side of the air conditioning heat exchanger 13 and the discharge side faces the air outlet 10, and the discharge side of the axial flow type blower 15 is extendable and retractable. Fitting 1
6. Connected to the air outlet 10 via a diffuser type discharge silencer 17 and a duct chamber 18.

The diffuser type discharge silencer 17 is
A sound absorbing material 17b is stretched over the inner surface of a tapered duct pipe 17a that widens at the end, and a sound absorbing tube 17c is provided in the center of the tapered duct pipe 17a. Furthermore, a sound absorbing material 18a is provided on the inner surface of the duct chamber 18 connecting the discharge silencer 17 and the air outlet 10, thereby improving the sound absorbing effect.

Note that the axial blower 15 has a casing 1
It is attached to the floorboard 6 via vibration isolating rubber.

In this configuration, the air blown to each room in the building is taken into the casing 1 through the air intake 9 by suction by the axial blower 15, passes through the intake silencer 12, and then heats the air for air conditioning. After being heated or cooled in the exchanger 13, and then given appropriate humidity in the humidifier 14, it is pressurized by the axial flow type blower 15, passes through the discharge silencer 17, and is sent from the air outlet 10 through a blower duct (not shown). Air is blown into each room. In this case, the return air from each room is
The air may be returned to the air intake port 9 via a return duct (not shown) connected to the air intake port 9.

By arranging the axial blower 15 and the air conditioning heat exchanger 13 in a casing made of a sound deadening panel, the noise generated by the axial blower 15 and the air conditioning heat exchanger 13 is directed to the outside. Among these noises, the noise directed toward the air intake port 9 and the air outlet 10 can be reduced.
Since the sound is absorbed by the intake silencer 12 and the discharge silencer 17, it is possible to reduce the noise propagated from the air intake port 9 and the air outlet 10 to each room via the duct.

Note that the intake silencer 12 is not limited to the splitter type or cell type of the above embodiment, but other types such as a diffuser type may also be used. It is not limited to the diffuser type, but a splitter type or cell type may be used.In short, it is sufficient to use a silencer that is suitable for the noise generated by the axial flow blower 15 and the air conditioning heat exchanger 13. .

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a partially cutaway perspective view of a central air conditioner, and FIG. 2 is a cross-sectional view of the central air conditioner. 1...Casing, 2, 3, 4, 5...Side plate, 6
... Floor board, 7... Ceiling board, 9... Air intake, 10... Air outlet, 11... Intake filter, 12... Intake silencer, 13... Air conditioning heat exchanger, 14... Humidifier,
15... Axial blower, 16... Expansion joint, 17... Discharge silencer.

Claims (1)

[Scope of utility model registration request] An axial blower and an air conditioning heat exchanger are provided in a casing made of a sound-absorbing panel, and an air intake port and an air outlet are provided in the casing made of the sound-deadening panel, and an air outlet is provided in the casing. Forms an air path in which air taken in from the air intake port passes through the air conditioning heat exchanger, passes through an axial blower, and reaches the air outlet, and the air path includes the air intake port and the air conditioning heat exchanger. 1. A central air conditioner, characterized in that an intake silencer is provided between the heat exchanger and a discharge silencer is provided between the axial blower and the air outlet.