JPH0282042A - Ventilating device - Google Patents

Abstract

PURPOSE:To reduce an amount of noise discharged in a room by a method wherein a sound absorbing material is glued to the interior of the air feed passage and the interior of the air exhaust passage of a weather cover provided on the outdoor side, and the two air passages are partitioned from each other by means of a partition wall formed by a sound absorbing material. CONSTITUTION:With a motor 5 runs, an air feed flow A and an air discharge flow B are generated, and a ventilating motion is performed. Noise from the inside and the outside of a device is absorbed during the passage of it through the sound absorbing material of parts, i.e., sound absorbing materials 22, 24, and 27, a partition wall 23, and a heat exchanger 28. Since an air feed passage 12 and an air discharge passage 13 of a weather cover 21 are formed such that they are lengthened in the directions of the air feed flow A and the air discharge flow B, a sound absorbing function can be improved. The thicknesses of the sound absorbing materials 22 and 23 are increased to an enoughly high value, and noise in a range of from a low frequency to a high frequency is absorbed. Thereby, the sound absorbing material 27 of an outer box 2 except the weather cover 21 is formed in a thin manner and can cope with absorption of noise of a high frequency. Further, the partition wall 23 of the weather cover 21 is formed by a sound absorbing material itself.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a device that performs ventilation by exchanging heat between outdoor air and indoor air.

[Conventional technology]

FIG. 6 is a longitudinal sectional side view of a conventional ventilation system disclosed in, for example, Japanese Utility Model Publication No. 61-7455.

In the figure, (1) is the building wall that partitions the outdoors and indoors, (2) is the rectangular cylindrical outer box fixed to the wall (1), and (3) is the outer box (2).
The outdoor suction port (4) installed on the outdoor side (left side of the figure)
) is the outdoor exhaust port provided above the outdoor suction port (3), (5) is the motor installed inside the outer box (2),
(6) is the air supply 77 engine rotated by the motor (5), (
Reference numeral 7) also represents an exhaust fan, in which a supply air flow A is generated by the air supply fan (6), and an exhaust flow B is generated by the exhaust flow fan (7). (8) is a heat exchanger fixed on the upstream side of the exhaust fan (7), and is configured so that the supply air flow A and the exhaust air flow B cross and flow independently from each other.

(9) is a decorative cover attached to the indoor side (right side in the figure) of the outer box (2), and the indoor side suction port Ql11 is provided at the bottom.

An indoor air supply port αD is provided at the top. a2 is an air supply air path inside the outer box (2), and (+3 is also an exhaust air path).

A conventional ventilation device is constructed as described above, with a motor (5)
When the air supply fan (6) and exhaust fan (
7) rotates. Due to the rotation of the air supply fan (6).

Air from the outdoor side is sucked in from the outdoor side suction port (3), becomes a supply air stream, passes through the air supply air path α in the outer box (2), enters the heat exchanger (8), and becomes an exhaust air stream B. Heat is exchanged between the air and the air, and the air is blown into the room from the indoor air supply port αB.

On the other hand, due to the rotation of the exhaust fan (7), the indoor air is sucked in from the indoor suction port 0I and becomes an exhaust flow B.
It enters the heat exchanger (8), where it exchanges heat with the supply air flow A, passes through the exhaust air passage 03 in the outer box (2), and is discharged outdoors from the outdoor exhaust port (4). .

[Problem to be solved by the invention]

In the conventional ventilation system as mentioned above, the air supply fan (6)
Since the air supply fan A and the exhaust fan rotate, and the supply air flow A and the exhaust air flow B flow, there is a problem in that noise from these is emitted into the room. In addition, while the air supply fan (6) and exhaust fan (7) are stopped, outdoor noise may be
There is also the problem of entering the room through the exhaust air passage 03 and the exhaust air passage 03.

This invention was made to solve the above-mentioned problems, and it is an object of the present invention to provide a ventilation system that can reduce the noise emitted into a room as much as possible.

[Failure to solve the problem]

The ventilation device according to the present invention has a weather cover provided on the outside of the room, a sound absorbing material is attached to the inside of the air supply air passage and the exhaust air passage, and nine air passages are partitioned by a partition wall made of the sound absorbing material. be.

Further, there is a ventilation device according to another invention of this invention.

An interference pipe is provided that communicates the upstream and downstream sides of the exhaust flow.

Further, there is a ventilation device according to another invention of this invention.

The heat exchanger is constructed from block-shaped sound absorbing material.

[Effect]

In this invention, sound-absorbing material is attached to the supply air passage and the exhaust air passage in the weather cover, and one screen air passage is partitioned off with the sound-absorbing material, so that the noise contained in the air flow passing through the nine-screen air passage is absorbed, and the There is no need to partition both air passages with other members and attach sound absorbing material to both sides.

Further, in another aspect of the present invention, since an interference pipe is provided in the exhaust air path, the sound of a specific frequency is muffled due to interference.

Still, in another aspect of the present invention, the heat exchanger is constructed from a block-shaped sound absorbing material, so the heat exchanger also has a sound absorbing function.

〔Example〕

Figures 1 to 3 are diagrams showing one embodiment of the present invention.
2 is a sectional view taken along the line 1--1 in FIG. 1, and FIG. 3 is a sectional view taken along the line 1--1 in FIG. 2.

FIG. 4 is a perspective view of the heat exchanger, and FIG. 5 is a diagram illustrating the principle of the interference tube, and parts similar to those of the conventional device are designated by the same reference numerals.

In the figure, Qυ is the weather cover that constitutes the outdoor part of the outer box (2), 03 is the sound-absorbing material attached to the inner surface of the weather cover, and (to) is the air supply path Q4 and exhaust air path α3 inside the weather cover 〇υ. It is a partition wall that separates the rooms and is made of sound-absorbing material. (B) is a fan casing made of sound absorbing material that surrounds the air supply fan (6) and the exhaust fan (force), and two layers of air supply air passages (+3 and exhaust air passage α) are formed on the upper part of the fan casing.

A supply air discharge port (to) is opened above the supply air fan (6) and communicates with the supply air passage α4, which in turn communicates with a heat exchanger (to) which will be described later. In addition, an exhaust fan (an exhaust outlet (1) opens above the force and communicates with the exhaust air path α).

It is connected to weather cover c2υ. The forehead is the air supply air passage (sound absorbing material pasted on the inner surface of each one; @ is the air supply air passage (28a) formed of block-shaped sound absorbing material and passing through it, and the exhaust air passage passing through it independently and intersecting with it). The heat exchanger provided with the passage (28b), @ is an interference tube that communicates the space on the exhaust outlet side of the heat exchanger (to) with the space near the outdoor exhaust port (4) of the weather cover Qυ.

In a ventilation system configured as described above.

When the motor (5) is operated, the air supply K is
A and exhaust flow B are generated and a ventilation operation is performed.

9 Noise from inside and outside the aircraft is absorbed by the sound-absorbing materials in each part), Q4. It is absorbed when passing through the partition wall (c) and the heat exchanger (to). weather cover 09
Since the supply air passage α and the exhaust air passage α are formed to be longer in the direction of the supply air flow A and the exhaust air flow B, it is possible to enhance the sound absorption function. The sound absorbing material in this part (
C) is sufficiently thick to absorb noise from low frequencies to high frequencies. Therefore, weather cover Q
The sound-absorbing material (5) of the outer box (2) other than υ is made thin so that it can absorb high-frequency noise. Note that the partition wall (to) of the weather cover 〇ll) is formed of the sound absorbing material itself, which is useful for saving space. In other words, 9 Normally, when the supply air passage O3 and the exhaust air passage a'3 are partitioned, they are usually partitioned with a steel plate or the like, and sound absorbing material must be attached to both sides of the partition, but in this embodiment, this is not necessary. This means that space can be saved in the thickness direction.

The interference tube has a function of silencing noise at a specific frequency, and is known to have a 9-order silencing effect.

Now, as shown in Fig. 5, the sound path is divided into path L1 and path L.
Divide it into two parts, Ll-L2-λ/2 (λ is the wavelength of the sound), and merge the paths into one again.

The two sounds interfere with each other and are attenuated. Namely.

From the exhaust outlet side of the heat exchanger (to) to the outdoor exhaust outlet (4)
Let Ll be the length of the exhaust air path α leading to , L2 be the length of the interference pipe (to), and C be the speed of sound.

It is possible to attenuate the frequency f obtained by , and the frequencies 3f, Sf, . . . .

〔Effect of the invention〕

As explained above, in this invention, the weather cover includes
Since sound-absorbing material was pasted inside the supply air duct and exhaust air duct, and the nine air ducts were partitioned with sound-absorbing material, it was possible to reduce the noise contained in the air flow passing through both air ducts, and There is no need to partition both air passages with other members and attach sound absorbing material to both sides, which has the effect of saving space and making it possible to construct the structure at low cost.

Further, in another aspect of the present invention, since the upstream side and the downstream side of the exhaust air passage are communicated with each other by an interference pipe, there is an effect that the j sound of a specific frequency can be muffled.

Further, in another aspect of the present invention, since the heat exchanger is made of a block-shaped sound absorbing material, there is an effect that noise can be reduced in this part as well.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the ventilation device according to the present invention, and FIG. 2 is a cross-sectional view taken along the line of FIG. 1. Figure 3 is a cross-sectional view taken along the line in Figure 2, Figure 4 is a perspective view of the heat exchanger in Figure 1, Figure 5 is an explanatory diagram of the principle of the interference tube in Figure 1, and Figure 6 is the conventional FIG. In the figure, (3) is an outdoor suction port, and (4) is an outdoor exhaust port. (6) is a supply fan, (7) is an exhaust fan, Ql
is a partition wall in the room, @ is a heat exchanger, and 2I is an interference tube. In addition, in FIG. 1, the same reference numerals indicate the same or corresponding parts.

Claims (3)

[Claims] (1) An air supply air passage which is provided from the inlet of the weather cover provided on the outside side to the air supply port on the indoor side, through which the supply air flows, and an air supply path which is provided from the inlet on the indoor side to the exhaust port of the weather cover, and which is provided for exhaust air. in the air supply air passage in the weather cover, in which a heat exchanger is installed on the indoor side in which the supply air flow and the exhaust air flow cross each other independently; and a ventilation system, characterized in that a sound-absorbing material is adhered to the inside of the exhaust air passage, and a partition wall made of the sound-absorbing material is provided to partition both air passages in the weather cover. (2) An air supply path that runs from the outdoor air intake port to the indoor air supply port, through which supply air flows, and an exhaust air path that runs from the indoor air intake port to the outdoor air exhaust port, through which exhaust air flows. and a heat exchanger is installed on the indoor side in which the supply air flow and the exhaust air flow cross each other independently, and an interference pipe is provided that communicates the upstream side and the downstream side of the exhaust air flow. A ventilation system characterized by being provided with. (3) Air supply flow from the outdoor air intake port to the indoor air supply port,
Ventilation equipped with a heat exchanger in which exhaust streams from an indoor suction port to an outdoor exhaust port cross each other independently, and the heat exchanger is constructed of a block-shaped sound absorbing material. Device.