JPH0735125B2 - Blower of air conditioner for automobile - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air blower for an air conditioner for a vehicle, and more particularly to an inside air and an outside air for selectively taking in air inside the vehicle interior and air outside the vehicle interior into the air conditioning equipment. The present invention relates to a soundproof structure for a device of this type including a switching device.

[Background of the Invention]

In this type of device, when the inside air is sucked in, noise such as the rotation noise of the blower or the noise of the wind blows into the passenger compartment from the inside air inlet, which causes an unpleasant occupant.

In order to solve this problem, in JP-A-57-164808, a sound absorbing mechanism composed of a reflection plate and a sound absorbing material is provided around the inside air introduction port, and in JP-A-58-8421 an inside / outside air switching damper. It has been proposed that a sound absorbing material is provided on the inner wall surface of the case where the gyro rotates. All of these are effective enough to reduce the noise that propagates from the suction port of the blower to the inside air introduction port to the passenger compartment, but the ventilation path formed between the suction port of the blower and the inside air introduction port. The turbulence of the air flow causes the case and the main body of the blower to be vibrated, which is not very effective in reducing the noise generated thereby.

[Object of the Invention]

A first invention of the present application aims to prevent generation of turbulence in a ventilation passage and reduce noise due to turbulence.

The second invention of the present application achieves the above object, and further attenuates noise propagating from the inside air introduction port to the vehicle interior through the ventilation passage between the suction port of the blower and the inside air introduction port while passing through the ventilation passage. The purpose is to eliminate the need to provide a special sound absorbing mechanism on the passenger compartment side of the inside air introduction port.

[Outline of Invention]

In order to achieve the above first object, the first invention of the present application arranges the current plate in the ventilation passage between the inside air introduction port and the suction port of the blower so as not to hinder the switching operation of the damper. Then
This straightening plate divides the ventilation passage into a plurality of layers so that turbulence is less likely to occur in the ventilation passage.

In order to achieve the latter object, the second invention of the present application is such that the switching operation of the damper is not hindered in the ventilation passage between the inside air inlet and the suction inlet of the blower. The sound absorbing member is provided along the air flow passing through the inside, and the sound absorbing member divides the ventilation path into a plurality of layers to suppress the generation of turbulence and the propagation of noise.

Example of Invention

An embodiment of the present invention will be described in detail below based on an embodiment shown in the drawings.

The blower device BL is installed under the ventilating cowl K of the vehicle and is installed in the vicinity of the partition plate FW that separates the engine room E and the vehicle room R.

The casing 1 of the blower device BL is composed of an upper case 1a and a lower case 1b formed by resin molding.

Bellmouth BE is placed in the center between the upper case 1a and the lower case 1b.
A metal plate 2 having is attached.

The outside air introduction port 3 formed in the upper case 1a is connected to the outside air intake port OI opening in the cowl K.

The inside air inlet 4 formed in the upper case 1a opens into the passenger compartment.

The bell mouth BE forms the suction port 5 of the blower device BL.

The centrifugal fan F, which is rotationally driven by the motor M, is fixed to the bottom wall surface of the lower case 1b by the bracket 6 while the suction side is positioned so as to face the suction port 5.

The inside / outside air switching damper 7 is rotatably supported at a branch point position between the outside air introduction port 3 and the inside air introduction port 4 of the upper case 1a.

The current plate 8 is rotatably supported at the center position of the inside air introduction port 4 in the vertical direction.

The inside / outside air switching damper 7 and the current plate 8 are arranged in parallel.

Both are connected by a link mechanism on the outer surface of the case as shown in FIG.

When the atmosphere is introduced into the actuator 9, the actuator rod 10 is pulled in the P arrow direction by the pulling force of the spring 11. That is, the tension of the spring 10 causes the shaft to shift.
The metal fitting 13 fixed to one end of 12 is pulled in the direction of the arrow X, whereby the shaft 12 rotates clockwise. Shaft
When 12 rotates, the L-shaped metal fitting 14 fixed to the other end of the shaft 12 also rotates clockwise, and the rod 10 is pulled in the P arrow direction.

When the metal fitting 14 rotates clockwise, the intermediate lever 15 rotatably pinned to the other end of the metal fitting 14 is pulled upward in the drawing, and the metal fitting 16 rotatably pinned to the other end of the intermediate lever 15 is pulled. Rotate clockwise. As a result, the shaft 17 of the current plate 8 fixed to the other end of the metal fitting 16 rotates in the clockwise direction and operates the current plate 8 to the position shown in FIG. 1 in conjunction with the movement of the inside / outside air switching damper 7.

This state is the inside air introduction state.

When a negative pressure is introduced into the actuator 9, the rod 10 becomes a spring.
The spring 11 is stretched by pulling in the direction of the arrow Q against the tensile force of 11. That is, when the metal fitting 14 is pulled by the rod 10 and rotates in the counterclockwise direction, the shaft 12 rotates in the counterclockwise direction, which causes the metal fitting 13 to rotate in the counterclockwise direction.
Is stretched.

When the metal fitting 14 rotates counterclockwise, the intermediate lever 15 is pushed downward in the drawing, and as a result, the metal fitting 16 rotates counterclockwise, rotating the shaft 17 of the straightening vane counterclockwise to move the straightening vane 8 inside and outside. The air switching damper 7 is operated in the position shown in FIG.

This state is the outside air conduction state.

What is important here is that, in the inside air introduction state shown in FIG. 1, the air passage between the inside air introduction port 4 and the suction port 5 of the blower is divided into two layers by the straightening vane 8.

When comparing the embodiment having the divided ventilation passages with the conventional one, even in the case of this embodiment, even if the flow velocity of the wind passing therethrough is such that a swirl flow is generated in the case of the prior art. , No eddy current is generated in any layer of the ventilation passage. As a result, under normal use conditions, the casing is not vibrated by the vortex, and the noise due to the vortex is reliably prevented.

However, the noise generated by this type of blower is not limited to the generation of eddy currents in the ventilation passage.

The cause of loud noise is the delamination sound at the bell mouth, which is generated when the air is sucked into the machine through the suction port 5 of the blower, the wind noise caused by the rotation of the centrifugal fan, and the desorption sound of the wind, which is generated on the inner wall of the blower. Etc.

In particular, in this embodiment, it is assumed that the separation of the wind is generated on the surface of the straightening vane 8 by providing the straightening vane 8.

Therefore, the present inventors have considered constructing the current plate itself with a member having a sound absorbing function.

In this embodiment, the sound absorbing member is a resin rectifying plate 8 and an elastic body in which polyester urethane foam foam adhered to both surfaces thereof is filled with acrylic, or ether urethane foam foam is tar (asphalt material). And a sound-absorbing object made of an elastic material or the like. Further, the sound absorbing body 20 made of the above elastic body was attached to the surface of the inside / outside air switching damper 7 on the side of the current plate 8, and the sound absorbing bodies 21, 21 made of the above elastic body were also attached to the inner wall of the upper case 1a.

The sound absorbing member need not have a resin plate as long as it has a predetermined rigidity, and the sound absorbing objects 18 and 19 themselves may be configured to perform both the functions of rectifying and sound absorbing.

Further, although it is not always necessary to provide a sound absorbing object on the inside / outside air switching damper 7 and the inner wall of the upper case 1a, the noise reducing effect is enhanced when used in parallel.

Most of the noise generated in the bell mouth portion BE of the suction port 5 of the blower and the inside of the blower collides with the inside / outside air switching damper 7 and is reflected, and then collides with the straightening plate 8 constituting the sound absorbing member. The noise reflected by the current plate 8 further collides with the inside / outside air switching damper 7. In this way, the energy is reduced while the reflection is repeated between the inside / outside air switching damper and the rectifying plate. Further, at each reflection, energy is absorbed by the sound absorbing objects 20 and 18 attached to the surface, and the noise is attenuated before reaching the inside air introduction port 4.

The rest of the noise that has collided with the lower surface of the rectifying plate 8 in the drawing is absorbed in energy by the sound absorbing body 19 attached to the surface, and eventually the noise is considerably attenuated by the time it reaches the inside air inlet 4. .

Naturally, the sound absorbing objects 21, 21 attached to the inner wall of the upper case 1a also absorb part of the noise scattered in the case.

In addition, if the sound absorbing member is configured as a rectifying plate as in the embodiment,
As compared with the case where the straightening plate is made of a resin plate, there is an effect that the generation of peeling noise on the surface is eliminated.

FIG. 4 shows another structure of the drive mechanism of the sound absorbing member including the flow regulating plate 8.

The straightening vane 8 has a spring 22 whose one end is fixed to the wall surface of the upper case 1a.
Is locked at the other end and is always urged in the direction to open the inside air introduction port 4.

Therefore, when the inside / outside air switching damper 7 is operated to the position for opening the inside air introducing port 4 as shown in FIG. 4, the straightening plate 8 is pulled in the direction of opening the inside air introducing port 4 by the pulling force of the spring 22, and is not shown. The shaft 17 rotates until it is blocked by the stopper.

When the inside / outside air switching damper 7 is operated to the position where the inside air inlet 4 is closed, the inside / outside air switching damper 7 directly contacts the rectifying plate 8, and the inside / outside air switching damper 7 resists the force of the spring 22 to move the rectifying plate 8 in place. At the same time, the inside air introduction port 4 is operated to the position where it is closed.

According to this mechanism, the structure of the drive mechanism for the current plate can be simplified, and the frictional contact points can be reduced as compared with the link mechanism, so that the operation force can be reduced.

FIGS. 5 to 7 show another embodiment of the sound absorbing member having a flow straightening plate and a flow straightening function.

The straightening vanes 24, 26 are vertical grids 28, 30 formed in the inside air inlet 4.
It is configured as a resin plate integrally formed with.

The above-mentioned sound absorbing object is adhered to the surfaces of the flow regulating plates 24 and 26, and both constitute a sound absorbing member having a flow regulating function.

The straightening vanes 24, 26 are formed as a triangle having sides formed by the vertical grids 28, 30 and a bottom side parallel to the metal plate 2 and an oblique side facing the corner between both sides, and the lower end thereof has a suction port 5 of the blower.
Has been extended to near the center.

In the figure, 25 and 27 are horizontal grids.

As shown in FIG. 7, the inside air switching damper 7 has straightening vanes 24, 26.
The slits 32 and 34 are provided at positions corresponding to.

When a negative pressure is applied to the actuator 9, the rod 10 is pulled in the Q arrow direction and the lever 38 rotates counterclockwise. This rotational force causes the shaft 12 fixed to the lever 38 to rotate counterclockwise, so that the inside / outside air switching damper 7 fixed to the shaft 12 is moved from the position where the outside air inlet 3 is closed to the inside air inlet 4.
To the closed position.

At this time, the straightening vanes 24 and 26 are fitted into the slits 32 and 34 of the damper 7 and guide the rotation of the damper 7.

On the contrary, when the actuator 9 is introduced into the atmosphere, the shaft 12 is rotated clockwise by the tensile force of the spring 11 through the metal fitting 13, and as a result, the damper 7 is moved to the position where the outside air inlet 3 is closed.

At this time, part of the outside air also flows in through the slits 32 and 34. When this invasion of the outside air is not preferable from the viewpoint of temperature control and humidity control, as shown by the broken line in FIG. 6, the current plate 4 is provided inside the outside air inlet 3 in correspondence with the current plates 24 and 26.
It is also possible to provide 0 and 42 so as to close the slits 24 and 26 of the damper 7 when the inside air is introduced.

The noise propagating from the suction port 5 to the inside air introduction port 4 at the time of introducing the inside air is between the inner wall of the upper case and the straightening vane 24, between the other inner wall of the upper case and the straightening vane 26, and between the straightening vane 24. The energy is attenuated while repeating reflections with 26, and a part of the energy is absorbed by the sound absorbing body attached to the inner wall of the upper case and the surface of the current plate.

Further, the straightening vane divides the inflowing airflow into three layers on the left and right and in the center to suppress the generation of turbulence, so that the casing is not vibrated by the turbulence.

When a straightening plate is also provided on the outside air inlet 3 side as shown by the broken line in FIG. 6, a straightening action can be obtained even when outside air is introduced. As a result, it is possible to suppress the occurrence of turbulence in the ventilation passage between the outside air introduction port 3 and the suction port 5 of the blower at the time of introducing the outside air, and it is possible to prevent noise from being generated by vibrating the casing at the time of introducing the outside air. .

The straightening vane of this embodiment has only two additional grooves for forming the straightening vane added to the conventional resin molding die by electric discharge machining or the like, and does not require a new split die. Minimize your investment.

Incidentally, in this embodiment, the upper case is manufactured by using three split molds. One of the molds is an outer mold that forms the outer surface of the case excluding the surface forming the inside air inlet of the upper case, an inner mold that has a groove for the inner wall surface of the case and the current plate, and a lattice surface of the inside air inlet 4. It consisted of a forming auxiliary mold.

The split mold could be used as it is, simply by forming a groove at a position corresponding to the conventional inner straightening plate.

At this time, it is necessary to pay attention to the slope A of the straightening vane.
And the slope of the inner wall surface B of the case facing this is equal or the slope of the slope A is steeper. With this structure, the inner mold is pulled out to the lower left in FIG. 6 along the inclination of the inner wall surface of the case, so that the inner wall surface of the case and the current plate can be molded simultaneously by one inner mold.

In addition, the straightening vanes 40 and 42 shown by the broken line in FIG. 6 should be added by engraving the straightening vane forming groove from the mating surface of the outer die and the inner die across both die. It can be formed integrally without.

In the figure, 46 and 48 are clips for connecting the upper case and the lower case.

〔The invention's effect〕

As described above, according to the first invention of the present application, the airflow path between the inside air inlet and the air intake of the blower is provided with the rectifying means for dividing the airflow path into a plurality of layers. It was possible to prevent the occurrence of turbulent flow, and to suppress the noise generated when the casing was vibrated by the vibration energy due to the turbulent flow.

Turbulent flow can be further prevented by rotatably providing the rectifying means and moving the rectifying means to a position where resistance due to ventilation does not occur.

According to the second invention of the present application, since the rectifying means having the sound absorbing member provided on the surface thereof is provided in the ventilation passage between the inside air inlet and the inlet of the blower, the blower is divided into a plurality of layers. The sound absorbing member absorbs and attenuates energy such as the wind noise of the fan propagating from the suction port to the inside air introduction port through the ventilation passage, and the sound of wind separation at the bell mouth portion, while disturbing the disturbance in the ventilation passage. The flow can be prevented, and all the noise generated by the blower can be attenuated and reduced in the rotating casing of the inside / outside air switching damper, and the soundproofing mechanism can be made extremely simple.

[Brief description of drawings]

FIGS. 1, 2 and 3 are two sectional views and perspective views for explaining the configuration and operation of an embodiment of the air blower using the first invention of the present application, and FIG. 1 is a cross-sectional view showing an application example of the invention, and FIGS. 5, 6, and 7 are partial cross-sectional perspective views respectively for explaining the configuration and operation of an embodiment of a blower using the second invention of the present application. FIG. 3 is a sectional view and a plan view of a damper. BL: blower, 1a ... upper case, 1b ... lower case, 3 ...
… Outside air inlet, 4 …… Inside air inlet, 5 …… Blower suction inlet, 7 …… Inside / outside air switching damper, 8,24,26,40,42 …… Rectifier plate, 18,19,20,21… … A sound absorbing object.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masaru Shitara, Inventor Tadashi Takaba, Ibaraki Prefecture 2520 Takaba, Sawa Plant, Hitachi, Ltd. (72) Inventor Shigeyuki Katano 2520, Takaba, Katsuta, Ibaraki Inside the Sawa Factory (56) References: Open 59-122910 (JP, U) Open 58-186913 (JP, U)

Claims (4)

[Claims] 1. A blower, a case provided upstream of a suction port of the blower, an outside air introduction port formed in the case and communicating with the outside of the vehicle compartment, and an inside air introduction port communicating with the inside of the vehicle compartment. The inside / outside air switching damper that selectively switches the inside air introduction port and the outside air introduction port to communicate with the suction port of the blower, and the ventilation path in the case from the inside air introduction port to the suction port of the blower. In a blower for an air conditioner for a vehicle, which is provided with a rectifying plate for rectifying an air flow flowing in a ventilation passage, the rectifying plate is between the inside / outside air switching damper and the inside air introduction port, and is rotatable with the inside / outside air switching damper. A position which is composed of a straightening plate supported on the inside and outside air and is interlocked with the switching operation of the inside / outside air switching damper, and is brought into close contact with the inside / outside air introduction port by a part of the operating force for operating the inside / outside air switching damper. And a blower for an air conditioner for a vehicle, wherein the blower is switched to either a position facing the ventilation passage. 2. The air blower for an automobile air conditioner according to claim 1, wherein a sound absorbing member is provided on the surface of the current plate. 3. The blower for an air conditioner for an automobile according to claim 1, wherein the inside / outside air switching damper has a sound absorbing object installed on a surface of the rectifying plate. 4. The fixing plate according to claim 2, wherein a fixing plate is formed integrally with a lattice portion provided at the inside air introduction port and is substantially perpendicular to a surface of the inside / outside air switching damper, A blower for an air conditioner for a vehicle, wherein a fixing plate is opposed to a sound absorbing member attached to the damper through a notch.