JPH082410A - Air conditioning ventilation device for vehicle - Google Patents

Abstract

PURPOSE:To reduce the noise which is propagated through an air flow passage from a ventilation device and goes into a cabin by providing a silencing mechanism in a fresh air flow passage from an air supply means to a return air flow passage in the case where an air conditioning device, air supply means which takes a role of an air ventilation device and cabin are closely arranged in a railway vehicle. CONSTITUTION:A silencing mechanism 11 is provided in a fresh air flow duct 9. This silencing mechanism 11 is constituted by arranging a car body 1, passenger room 2, air conditioning device 3 air supply device 4, exhaust device 5, pressure damping device 6, conditioned air duct 7, return duct 8, fresh air duct 9 and exhaust duct 10 perpendicular to a duct comprising sound absorbing material, which is held by at least two perforated plates and has air permeability, or in a direction to shut off air flow.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner / ventilator, and more particularly to a vehicle air conditioner / ventilator suitable for a vehicle traveling at high speed.

[0002]

2. Description of the Related Art Conventionally, in a vehicle running at a high speed, for example, a bullet train, etc., the vehicle exterior pressure fluctuates abruptly, especially when friction is generated in a tunnel. It had a blower with a steep slope in air volume and pressure characteristics, and at the same time used a ventilator with a pressure relief mechanism. However, when the ventilator having the above characteristics is used, the noise generated from the blower and the pressure relief mechanism forming the ventilator has been a problem.
As means for reducing this noise, for example, JP-A-2-63
As in 960, it is known that a muffling mechanism is installed on the outer side of each pressure relief mechanism provided on the outer side of the air supply side and exhaust side blowers forming the ventilation device.

[0003]

Usually, in order to reduce the air conditioning load, an air conditioner mixes not only fresh air but also return air from inside the vehicle and sends it to a heat exchanger to supply it as conditioned air into the vehicle. are doing. On the other hand, a ventilator is required to have a high pressure characteristic as the speed of the vehicle increases, so that the number of revolutions of the blower of the ventilator increases, and the noise of the entire ventilator tends to increase. Further, in order to reduce the pressure loss due to the shortening of the flow path length, the ventilation blower of the air supply means forming the air conditioner and the ventilation device, that is, the air supply means may be arranged close to each other. At the same time, for the same reason, the return air flow path for guiding the return air from the passenger compartment may be shortened in length. Here, since the fresh air flow path from the air supply means is connected to the return air flow path, in the above case, the opening in the passenger compartment of the return air flow path is close to the air supply means. It will be arranged in the state of being. For this reason, it is expected that the noise will increase along with the performance improvement of the air supply means and the noise will propagate through the air flow path and enter the passenger compartment.

In the above-mentioned prior art, the noise outside the vehicle can be reduced by providing the muffler on the outside of the ventilator / pressure relief mechanism. However, as described above, the air supply means that constitutes the ventilator passes through the air flow path. No sufficient consideration was given to the noise that entered the cabin.

According to the present invention, when the air-conditioning means and the air supply means forming the ventilation device are arranged close to each other in the passenger compartment, they are generated from the blower of the air supply means and propagate through the air flow path to enter the passenger compartment. It is an object of the present invention to provide a vehicle air-conditioning ventilation device that can reduce noise.

[0006]

Means for Solving the Problems Air supply means for taking in air outside the vehicle into the vehicle, pressure relief means installed corresponding to the air supply means, and a sound deadening mechanism provided inside the air supply means. The above-mentioned object is achieved by using the air-conditioning ventilator constructed as follows.

[0007]

In the middle of the fresh air flow path from the air supply means to the return air flow path, a sound absorbing material that absorbs noise and has air permeability, and at least two sheets that sandwich the sound absorbing material from both sides. By providing a structure consisting of a perforated plate in the air flow path in the fresh air flow path, a sound deadening mechanism configured by installing the structure in a direction perpendicular to the air flow path or in a direction that blocks the air flow, The noise propagating in the air flow path can be reduced. In this case, since the blower forming the air supply unit has high pressure characteristics, the flow rate of fresh air supplied from the air supply unit is not impaired even if the muffling mechanism is provided as described above.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle air conditioning and ventilation system according to the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a vehicle body, 2 is a passenger compartment, 3 is an air conditioner, 4 is an air supply unit or an air supply unit for a ventilation system, 5 is an exhaust unit or an exhaust system for the ventilation system, and 6 is a pressure relief unit or pressure relief system. , 7 is a conditioned air flow path or air duct, 8 is a return air flow path or return duct, 9 is a fresh air flow path or fresh air duct, 10 is an exhaust air flow path or exhaust duct, and 11 is a sound deadening mechanism. Is.

Generally, an air conditioning and ventilation system for a railway vehicle has a structure as described below. Air conditioner 3
The air supply device 4 and the exhaust device 5 are mainly arranged under the floor or on the roof. Here, it is assumed that at least the air conditioner 3 and the air supply device 4 are arranged under the floor. The conditioned air duct 7
One end is connected to the conditioned air outlet of the air conditioner 3, and the other end is connected to the opening of the passenger compartment 2 or the deck, and the air flow path for sending the conditioned air from the air conditioner 3 to the passenger room 2 or the deck. Is formed. The return duct 8 has one end connected to the opening of the passenger compartment 2 or the deck, and the other end connected to the return air suction port of the air conditioner 3.
An air flow path is formed to send air from the passenger compartment 2 or the deck to the air conditioner 3. The fresh air duct 9 has one end connected to an outside vehicle fresh air intake 9A provided in the outer gable portion and the other end connected to a return duct 8 so that fresh air is introduced from outside the vehicle to the fresh air intake 9A / pressure. An air passage is formed for sending to the return duct 8 through the relaxation mechanism 6 and the air supply device 4. The exhaust duct 10 has one end connected to the opening of the passenger compartment 2 or the deck, and the other end connected to the exhaust air exterior discharge port 10A, and the exhaust air is exhausted from the passenger compartment 2 or the deck to the exhaust device 5 / pressure relaxation mechanism. 6. Exhaust air An air flow path is formed to be sent to the outside of the vehicle through the vehicle exterior discharge port 10A. At the portion where the fresh air duct 9B from the air supply device 4 is connected to the return duct 8, the fresh air and the return air are mixed at a ratio of about 1: 4 to 1: 3 and drawn into the air conditioner 3. It is like this. In addition, the ventilation device constituted by the air supply device 4 and the exhaust device 5 has a high pressure characteristic in order to prevent the pressure fluctuation outside the vehicle from propagating to the inside of the vehicle. Some are attached to. While the static pressure characteristic of the air conditioner 3 is about 40 to 110 mmAq at the rated air volume,
The static pressure characteristic of the ventilation device is as high as 300 to 500 mmAq at the rated air volume, and the higher the pressure characteristic of the ventilation device, the more noise tends to increase.

In order to reduce the pressure loss, when the air conditioner 3, the air supply device 4 and the passenger compartment 2 are arranged close to each other as shown in FIG.
A section that forms an air flow path from the air supply device 4 to the passenger compartment opening of the return duct 8 (the section 9B from the air supply device 4 to the return duct 8 in the fresh air duct 9 and the return duct 8). The path length of the section 8A) from the fresh air / return air confluence to the opening of the return duct passenger compartment is shortened. Then, the noise generated from the blower forming the air supply device 4 easily propagates to the passenger compartment 2 through the section forming the air flow path from the air supply device 4 to the opening in the passenger compartment of the return duct 8. Become. Therefore, by providing a muffling mechanism 11 in the section 9B from the air supply device 4 to the return duct 8 in the fresh air duct 9, the air flow path from the air supply device 4 to the opening in the passenger compartment of the return duct 8 is provided. It is possible to reduce noise generated from the blower forming the air supply device 4 that propagates in the formed section and enters the passenger compartment 2. Here, the sound deadening mechanism 11 is, as shown in FIG. 2, a glass wool 13 that absorbs noise and can be used as a sound absorbing material having air permeability, and at least two perforations that sandwich the glass wool from both sides. A structure including the plate 12 is configured by being installed in the duct in a direction perpendicular to the duct or in a direction that blocks the air flow. Here, even if the muffling mechanism is installed in the section 9B from the air supply device 4 to the return duct 8 in the fresh air duct 9, the pressure characteristic of the air supply device 4 is high, so that the fresh air sent from the air supply device is supplied. It does not impair the air flow rate. Further, as described above, since the muffling mechanism 11 is provided in the fresh air duct 9B on the air supply device 4 side with respect to the air merging position of the fresh air and the return air, the pressure characteristic is higher than that of the air supply device 4. There is no pressure loss to the low air conditioning system 3 (return duct 8 here). At the same time, this muffling mechanism 11
Of the airflow resistance of the air supply device 4, the flow rate of the fresh air blown from the air supply device 4 can be suppressed to be equal to or less than the flow amount of the air flowing into the air conditioner 3, and the fresh air blown out from the air supply device 4 is returned. It is possible to prevent the backflow to the passenger compartment 2 through the duct 8. Here, the muffling mechanism 11 of FIG.
The diameter of the hole of the perforated plate 13 in FIG.

Similarly, when the exhaust device 5 is arranged close to the passenger compartment 2, a section (an exhaust device 5 in the exhaust duct 10 in the exhaust duct 10 that forms an air flow path from the exhaust device 5 to the opening in the passenger compartment of the exhaust duct 10). To the opening in the cabin 1
The path length of 0B) is shortened. Then, the exhaust device 5
The noise generated from the blower that forms the air blower easily propagates to the passenger compartment 2 through a section that forms an air flow path from the exhaust device 5 to the opening in the passenger compartment of the exhaust duct 10. Therefore, by providing the silencing mechanism 11 in the section 10B from the exhaust device 5 to the passenger compartment opening in the exhaust duct 10,
It is possible to reduce the noise generated from the blower that constitutes the exhaust device 5 that propagates in the section forming the air flow path from the exhaust device 5 to the passenger compartment opening of the exhaust duct 10 and enters the passenger room 2, and to exhaust the exhaust gas. Since the pressure characteristic of the device 5 is high, the flow rate of exhaust air drawn into the exhaust device is not impaired.

Here, the sound deadening mechanism 11 may be replaced by the sound deadening mechanism 14 shown in FIG. The sound deadening mechanism 14 is provided with a perforated plate 12 around the air flow path, a glass wall 13 is buried as a sound absorbing material on the opposite side of the air flow path of the perforated plate, and on the opposite side of the air flow path of the sound absorbing material. An outer wall is provided, and at the same time, at least one air flow resistance is installed.
Here, the airflow resistance has a structure in which a glass wool 13 used as a sound absorbing material is sandwiched by at least two plates 15, and is arranged in a direction perpendicular to the air flow path or a direction in which the air flow is blocked. The structure shall be such that it can be installed with a gap so that the required air flow rate can be obtained. By adopting the above-described structure, the muffling mechanism 13 can simultaneously satisfy the muffling function and the air flow resistance function, as in the muffling mechanism 11.

[0013]

As described above, according to the present invention, it is possible to reduce the noise that propagates through the ventilation duct from the ventilation device and enters the passenger compartment while maintaining the transmission of the pressure fluctuation outside the vehicle into the vehicle interior. .

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an air flow path system of an embodiment of a vehicle air conditioning / ventilation device according to the present invention.

FIG. 2 is a side view showing a detailed structure of a sound deadening mechanism in FIG.

FIG. 3 is a plan view of the sound deadening mechanism of FIG. 2 seen from above.

FIG. 4 is a plan view showing a detailed structure of another embodiment of the sound deadening mechanism.

[Explanation of symbols]

1 ... Car body, 2 ... Guest room, 3 ... Air conditioner, 4 ... Air supply device, 5 ... Exhaust device, 6 ... Pressure relief device, 7 ... Conditioned air duct, 8 ... Return duct, 9 ... Fresh air duct, 10 …
Exhaust duct, 11 ... Sound deadening mechanism, 12 ... Perforated plate, 13 ... Sound absorbing material, 14 ... Sound deadening mechanism, 15 ... Plate.

Claims (4)

[Claims] 1. An air supply means for taking in the air outside the vehicle into the vehicle, a pressure relief means installed corresponding to the air supply means, and a muffling mechanism provided inside the air supply means. A vehicle air-conditioning ventilation system. 2. The vehicle air-conditioning ventilation system according to claim 1, wherein the sound deadening mechanism absorbs noise and has a breathability, and at least two sheets of the sound absorbing material sandwiching the sound absorbing material from both sides. An air-conditioning ventilation system for vehicles, characterized in that a structure comprising a perforated plate is installed in an air flow path in a direction perpendicular to the air flow path or in a direction that blocks the air flow. 3. An air supply means, an exhaust means, and an air conditioner means for supplying the fresh air supplied from the air supply means into the vehicle and the return air drawn from the passenger compartment to the passenger compartment as conditioned air by a heat exchange function. In the vehicle air-conditioning ventilation system, a silencer is provided in the fresh air flow path on the air supply unit side of the air flow confluence position of the fresh air and the return air. 4. The vehicle air-conditioning ventilator according to claim 3, wherein the muffling mechanism has a flow rate of fresh air blown from the air supply means equal to or less than an inflow amount of the air-conditioning device in order to draw the return air into the air-conditioning device. A vehicle air-conditioning ventilator having a flow resistance that can be suppressed to