JPS6216372Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is installed in the engine room of an automobile and blocks noise from equipment that is fixed in contact with an opening provided in a partition wall that partitions the engine room and the passenger compartment. This relates to a sound insulation structure for.

For example, heat exchangers that are inserted in the heat exchange cycle of air conditioning equipment in passenger cars are recently installed on the engine compartment side of the partition wall (dutshu panel) that separates the engine compartment from the passenger compartment in order to increase the space inside the vehicle. is normal.

The heat exchanger itself, together with the blower fan, is covered by a single-plate steel housing, and at the same time, the inlet and outlet are flange-connected to openings in the bulkhead via ducts, etc. The air inside the vehicle is circulated through the exchanger to exchange heat, and the air is circulated into the vehicle interior as cold or warm air.

By the way, as mentioned above, the heat exchangers are installed very close to each other, and although the bulkhead itself is soundproofed by insulator dashes, etc., the heat exchanger connected to the passenger compartment is The container is separated from the engine compartment by only the single housing mentioned above, and as a result, the noise and vibrations generated in the engine compartment are transmitted into the passenger compartment through the heat exchanger, impeding the comfort of the passenger compartment. There is a risk that it will be done.

Therefore, as a measure to prevent these noises and vibrations, sound-absorbing and sound-insulating materials are pasted on the inner and outer walls of the heat exchanger, but even with these sound-insulating measures, the expected effects have not been achieved. is the current situation.
Further, when we analyzed the cause of this problem, we found that the housing 2 adjacent to the partition wall 1, as shown in FIG.
Although there is a small gap l between the front wall 2a and the front wall 2a, it has been found that the noise and vibration propagation from this part is the largest. This means that the noise and vibrations that have entered the gap are amplified between the two opposing steel plates (housing and bulkhead) and become an extremely large amount of energy (indicated by the size of the arrow) from the bulkhead 1 to the passenger compartment. It is thought that the heat is transmitted from inside the housing 2 through the opening 3 to the passenger compartment side, or from the joint with the flange 4 to the passenger compartment side.

However, it has not been known in the past that large noises and vibrations occur between the partition wall and the equipment housing, and no countermeasures have been taken.

This invention has been made in view of the above knowledge, and one embodiment of this invention will be described in detail with reference to the drawings.

Figure 2 shows an evaporator unit 10 and a partition wall 11 in a car cooler to which this invention is applied.
This evaporator unit 10 is installed in the engine room A, and includes an evaporator body 12 that has a fan 12a and controls heat exchange, and a housing that encloses the evaporator body 12. 13, an air outlet 14 is formed in the center of the front wall 13a of the housing 13, and a flange 15 is formed around the outer periphery of the air outlet 14. This flange 15 and the edge of the opening 11a provided in the partition wall 11 Mounting bracket 16a, 1
Housing 1 by joining via 6a...
3 is fixed to the partition wall 11, and the main body 12 is connected to the air outlet 1.
4 to communicate with the inside of the vehicle compartment B.

Therefore, the front wall 13 of the housing 13
A gap l having a width corresponding to the amount of protrusion of the flange 15 is formed between a and the partition wall 11 .

The inside of this gap 1 is densely filled with a sound absorbing material 16 such as felt, urethane foam, glass wool, etc., and the space between the four peripheral edges of the front wall 13a and the partition wall 11, that is, the outer periphery of the gap 1, is A sound insulating material 17 such as a rubber sheet or a sealing material is interposed in the outer shape of the housing 13 to surround the frame or the periphery thereof.

Therefore, noise and vibration in the engine room A do not enter the gap l at all due to the sound absorbing material 16 and the sound insulating material 17, and the partition wall 11 and the housing 12
The sound only propagates into the cabin B from the top, bottom, sides and back through the air outlet 14, and although not shown in the figure, by adding sound absorbing and sound insulating materials to these parts, the required This provides a sound insulation effect.

Further, the housing 13 has a suction port 18 formed on its side face facing the fan 12a, but since this suction port 18 is connected to the vehicle interior B side via a rubber hose (not shown), it is possible to The transmission of noise and vibration is largely ignored.

As explained above, in the sound insulation structure according to this invention, the sound insulation material and the sound absorption material are simply inserted and filled into the outer periphery and inside of the gap formed between the partition wall and the front wall of the housing as described above. Since the noise and vibration that occur and amplify during these times are completely eliminated,
Compared to the conventional method in which sound insulation measures are applied only to the housing and partition walls, the construction is easier and moreover, a remarkable sound insulation effect can be obtained. Further, according to the sound insulation structure of the present invention, since the housing is configured to be attached to the partition wall through the sound insulation material and the sound absorption material using the mounting brackets, the sound insulation material and the sound absorption material can be attached without using adhesive or the like. Since it can be inserted and filled, the installation work is extremely simple. Furthermore, the sound insulating material inserted and filled in the outer periphery of the gap l has a slightly higher hardness and elasticity than the sound absorbing material inserted and filled inside, so it can prevent vibrations of the equipment. At the same time, the sound-absorbing material, such as felt, which is in a tattered shape and has an unsightly appearance, that is inserted and filled inside can be hidden from the outside by this sound-insulating material, so that the external appearance is improved. Furthermore, since the sound-absorbing material inserted and filled inside the gap l is protected by the highly hard sound-insulating material inserted and filled outside, the sound-absorbing material inside will not be crushed when installing equipment, etc. Since the sound-absorbing material always maintains a predetermined density, it has the effect that the sound-absorbing effect does not deteriorate.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view explaining the propagation of noise and vibration generated between the partition wall and the front wall of the housing, and Figure 2 shows the installation of the unit and the partition wall when this invention is applied to an evaporator unit in a car cooler. It is a sectional view for explaining a sound insulation structure. 10... Evaporator unit (equipment), 11
..... Partition wall, 11a .... opening, 12 .... evaporator main body (equipment main body), 13 ..... housing, 13
a...Front wall, l...Gap, 16...Sound absorbing material, 1
7...Sound insulation material.

Claims (1)

[Scope of utility model registration request] A housing that is disposed in an engine room of an automobile, is fixed in contact with an opening provided in a partition wall that partitions the engine room and the passenger compartment, and communicates with the passenger compartment, and equipment housed within the housing. A sound insulating material made of an elastic material such as a rubber sheet is provided on the outer periphery of the gap l formed between the partition wall and the front wall of the housing facing the partition wall, and a felt is provided inside the sound insulating material. 1. A sound insulation structure for automobile equipment, characterized in that the housing is filled with a sound absorbing material made of the like, and is configured so that the housing is attached to a bulkhead using mounting brackets.