JP2009280057A - Defroster nozzle structure - Google Patents

Abstract

A defroster nozzle structure is provided that has low pressure loss and can reduce noise.
A defroster nozzle 10 introduces air-conditioning air blown from an air conditioner unit 32 toward an upper direction of a vehicle body through an inlet 14 and once deflects the air in front of the vehicle body. The windshield glass 34 is blown out along the side of the interior of the windshield glass 34 from the air outlet 16 provided near the lower end of the vehicle body of the windshield glass 34 under the instrument panel 30. On the inner surface 20C of the wall 20B of the defroster nozzle 10 against which the air-conditioning air blown out from the air-conditioning unit 32 hits, at least one guide groove 12 is directed in a desired direction so as to follow the flow of the air-conditioning air toward the outlet 16. However, it is recessed so that it may become concave in the thickness direction.
[Selection] Figure 1

Description

  The present invention relates to a defroster nozzle structure.

  Conventionally, in the defroster for removing frost and fog on the vehicle interior side of the windshield glass (front glass), in order to spread the wind blown from the air conditioning unit uniformly to the vehicle interior side of the windshield glass, the inner surface of the defroster nozzle is There is a structure that guides wind in a desired direction by partitioning with partition walls or guide fins or by providing partitions (see, for example, Patent Document 1).

Moreover, in order to diffuse the wind blown from the defroster nozzle in a wider range, there is a structure in which a restriction is provided in the nozzle to reduce the cross-sectional area and increase the flow velocity of the wind (see, for example, Patent Document 2).
JP 2001-315523 A JP 2005-153818 A

  However, in the configuration of Patent Document 1, the distribution wall provided on the inner surface of the nozzle becomes pressure loss (air resistance), not only lowering the flow speed of the wind and lowering the performance of the defroster, but in order to compensate for this, Since it is necessary to increase the rotational speed of the blower, there is a risk of causing so-called air conditioning noise. That is, by providing the guide fins and forcibly changing the wind direction, the flow velocity increases on the surface of the guide fins, the shear force of the fluid (air) increases, and the pressure loss (air resistance) increases. Moreover, since the guide fin protrudes in the wind, it can be a noise source.

  Patent Document 2 discloses a technique related to the “vehicle air outlet structure”, but in this configuration, by reducing the cross-sectional area of the nozzle, only the flow velocity of the wind is increased according to Bernoulli's theorem. In the first place, the wind cannot be guided in a desired direction.

  In view of the above facts, an object of the present invention is to provide a defroster nozzle structure with low pressure loss and reduced noise.

  The defroster nozzle structure according to the first aspect of the present invention is provided in front of the vehicle body of the passenger compartment, communicates with an air conditioner unit that blows out airflow, and spreads the airflow in the vehicle width direction on the side of the passenger compartment of the windshield glass. A defroster nozzle that blows upward from the vehicle body along the vehicle body along the vehicle body, and a guide groove that is provided on the inner surface of the defroster nozzle and that is recessed outside the cross section of the defroster nozzle along the airflow guide direction. It is characterized by.

  According to the said structure, the groove | channel provided in the inner surface of the defroster nozzle can guide the airflow which blows off from an air-conditioner unit, and it can be set as the structure sprayed on a vehicle compartment side surface of windshield glass in a desired direction. That is, since airflow can be guided without providing guide fins, the direction of airflow can be guided while suppressing pressure loss and wind noise.

  According to a second aspect of the present invention, the defroster nozzle structure according to the first aspect of the present invention is the configuration according to the first aspect, wherein the air conditioner unit blows out the air flow upward in the vehicle body, and the defroster nozzle deflects the air flow forward of the vehicle body. The guide groove is provided on the inner surface of the lens.

  According to the said structure, since the groove | channel was provided in the inner surface of the bending part of the defroster nozzle, since the airflow which blown off from the air-conditioner unit hits a groove | channel directly, an airflow can be guided more efficiently.

  Since the defroster nozzle structure according to the present invention has the above-described configuration, an excellent effect that the pressure loss is low and noise can be reduced is obtained.

<Outline of structure>
An embodiment of a defroster nozzle structure according to the present invention will be described with reference to FIGS.

  In each figure, the arrow FR indicates the vehicle body front direction, the arrow RE indicates the vehicle body rear direction, the arrow UP indicates the vehicle body upward direction, the arrow IN indicates the vehicle body inner direction, and the arrow OUT indicates the vehicle body outer direction.

  FIG. 1 shows a defroster nozzle structure according to an embodiment of the present invention.

  As shown in FIG. 1A, an instrument panel 30 that forms a wall surface is erected on the vehicle body front side of the passenger compartment 11, and an air conditioner unit 32 is disposed in front of the vehicle body near the center in the vehicle width direction of the instrument panel 30. Is provided.

  A defroster nozzle 10, a center duct 44, a side duct 46, and a side defroster duct 50 are communicated with the air conditioner unit 32.

  The center duct 44 is configured to be branched so as to guide the conditioned air to a pair of left and right center registers 52 provided near the center in the vehicle width direction. A pair of left and right side ducts 46 are provided, and each of the side ducts 46 is long in the vehicle width direction and guides air-conditioned air to a side register 54 disposed near the outer end in the vehicle width direction. Each side duct 46 is divided at the center in the vehicle width direction, and each center in the vehicle width direction is formed integrally with the center duct 44 by resin molding. A pair of left and right side defroster ducts 50 are provided, and each of the side defroster ducts 50 is long in the vehicle width direction and guides conditioned air (warm air) to a side defroster 56 disposed in the vicinity of the outer end in the vehicle width direction. Yes.

  In addition to simple cooling and dehumidifying devices, for example, an HVAC (Heat Ventilating Air Conditioning) unit may be used as the air conditioning unit 32, and the air conditioning unit 32 may be configured to control general air conditioning including heating and ventilation.

  That is, the air conditioner unit 32 includes an evaporator as a cold source and a heater core as a heat source, and cools or heats the introduced air and discharges it as air-conditioned air. Dehumidified air-conditioning air is discharged from the air outlet 16 provided on the upper side of the vehicle body from the air-conditioning unit 32.

  A defroster device in which air-conditioning air is blown by the air conditioner unit 32 and the defroster nozzle 10 in order to remove clouding, frost, and the like that are condensed on the side of the passenger compartment of the windshield glass 34 standing on the vehicle body front side of the instrument panel 30 13 is configured.

  As shown in FIG. 1 (B), the defroster nozzle 10 introduces air-conditioning air (arrow 15) blown from the air-conditioner unit 32 toward the upper side of the vehicle body through the inlet 14, and once deflected forward of the vehicle body, While extending in the width direction, it passes under the instrument panel 30 toward the front of the vehicle body, and extends along the side of the vehicle interior of the windshield glass 34 from the air outlet 16 provided near the vehicle body lower end of the windshield glass 34. The structure is made to blow out.

  The blower outlet 16 has a substantially slit shape that is long in the vehicle width direction, and a plurality of rectifying plates 18 are provided in the vicinity of the outlet so that the airflow direction is controlled and foreign matter is prevented from entering the nozzle. .

  As shown in FIG. 1 (C), the inner surface 20C of the wall 20B of the defroster nozzle 10 against which the air-conditioning air blown out from the air-conditioning unit 32 abuts in a desired direction so as to follow the flow of the air-conditioning air toward the outlet 16. At least one guide groove 12 is provided so as to be concave in the thickness direction.

  Since the defroster nozzle 10 has a structure that widens in the vehicle width direction toward the air outlet 16, if a plurality of guide grooves 12 are provided, the interval between the guide grooves 12 also increases in the vehicle width direction. May be. Moreover, the width | variety of the vehicle width direction of the guide groove 12 itself, and the depth may be set as the structure which changes along the flow of air-conditioning air. Furthermore, the guide groove 12 may also be provided on the inner surface 20D of the wall 20A facing the wall 20B against which the air-conditioning air abuts.

<Effect>
Next, operations and effects of the embodiment of the present invention will be described.

  2A shows an enlarged view of the defroster nozzle 10 shown in FIG. 1, and FIG. 2B shows a cross-sectional view of a portion A of the defroster nozzle 10 shown in FIG. 2A.

  As shown in FIGS. 2A and 2B, the inner surface 20C of the wall 20B has a guide groove 12 provided so as to be recessed outward, in the vicinity of the inlet 14 along the flow of air-conditioned air. The air-conditioning air extends from the location where the air-conditioning air strikes toward the air outlet 16.

  Air-conditioned air blown out from the air-conditioning unit 32 is introduced into the defroster nozzle 10 through the intake port 14, hits the wall 20B of the portion bent forward of the vehicle body, and flows along the inner surface 20C. At this time, since the fast flow concentrates in the vicinity of the inner surface 20C due to the inertia of the air-conditioning air, an air flow 12V1 having a fast flow velocity V1 and an atmospheric pressure P1 is generated in the guide groove 12 as shown in FIG.

  On the other hand, the air at a location away from the wall 20B becomes an air flow 12V2 toward the outlet 16 at a flow velocity V2 and air pressure P2 slower than the air flow 12V1 and flows through the defroster nozzle 10. Since the air flow 12V1 flows at a flow velocity V1 faster than V2, assuming that the density of the air is ρ, V1> V2, and the following relationship is established according to Bernoulli's theorem.

^{P1 + ρV1 2/2 = P2} + ρV2 2/2

  ∴ P1 <P2

  That is, since the air flow 12V1 flowing in the guide groove 12 at the flow velocity V1 has a lower atmospheric pressure than the air flow 12V2 flowing at the slower flow velocity V2, the air flow 12V2 is drawn toward the guide groove 12 and consequently flows along the guide groove 12. The air flow 12V2 follows.

  Thereby, the direction in which the airflow 12V2 flows can be controlled by providing the guide groove 12 in the direction in which the airflow 12V2 wants to flow in advance.

  As a result, the present invention is implemented in comparison with the conventional defroster nozzle 110 as shown in FIGS. 4B and 5B, in which guide fins 112 are provided to forcibly control the direction of airflow. Since the defroster nozzle 10 according to the embodiment does not have the guide fin 112, the pressure loss of the blown air-conditioning air is reduced, and the air-conditioning air is efficiently blown to the side surface of the windshield glass 34 to reduce noise such as wind noise. can do.

  FIG. 3 shows the interior of the defroster nozzle 10 according to the first embodiment of the present invention, the defroster nozzle 110 that is provided with guide fins 112 to control the direction of airflow, and the defroster nozzle 100 that does not control the direction of airflow. The pressure loss (air resistance) at is shown.

  The total pressure was measured at four locations A to D from the inlet 14 to the outlet 16 of the defroster nozzle shown in FIG. 3 (A), Δ: groove-type vane (invention using guide groove 12), □: FIG. 3B shows the result of comparison of three types of normal vanes (using guide fins 112) and ◇: no vanes.

  As shown in FIGS. 3 (A) and 3 (B), the air-conditioning air blown upward in the vehicle body is introduced from the intake port 14 and hits the wall 20B of the defroster nozzle 10 in the section B. In the defroster nozzle 10 according to the first embodiment of the present invention, the pressure loss up to the section D before the outlet 16 and particularly the pressure loss from the section B to the section D is the conventional type in which the guide fin 112 is provided. It is less than the vaneless type that does not perform airflow control, and can perform efficient airflow direction control.

  As described above, since the defroster nozzle 10 according to the first embodiment of the present invention has a small pressure loss in the interior, it is not necessary to increase the rotational speed of the blower that blows air-conditioned air from the air-conditioning unit 32 in order to correct this. And power consumption can be reduced.

  Hereinafter, the wind speed vector in the vicinity of the outlet 16 of the defroster nozzle 10 according to the embodiment of the present invention, the wind speed distribution inside the defroster nozzle 10, and the wind speed distribution on the side surface of the windshield glass 34 are taken as examples. Explain the effect.

  FIG. 4A-1 shows a wind speed vector in the vicinity of the outlet 16 of the defroster nozzle 10 according to the embodiment of the present invention. In the following, it is shown that the higher the dot density, the higher the wind speed, and the lower, the lower the wind speed.

  As shown in FIG. 4A-1, the wind speed vector (arrow 17) in the vicinity of the air outlet 16 is guided in a desired direction by the guide groove 12, and there is little variation in the wind speed, and the air is blown out from the air outlet 16 uniformly. ing.

  On the other hand, in the conventional defroster nozzle 110 provided with the guide fin 112 shown in FIG. 4 (B-1), the guide fin 112 serves as an air resistance, and therefore, as shown by the wind speed vector (arrow 117), The wind speed in the vicinity of the fins 112 decreases, and it is difficult to blow the air-conditioned air uniformly. Alternatively, the defroster nozzle 100 without a guide member shown in FIG. 4C-1 does not guide the airflow, so that the wind direction and the wind speed are likely to be uneven as indicated by the wind speed vector (arrow 117).

  FIG. 4A-2 shows the wind speed distribution inside the defroster nozzle 10 according to the embodiment of the present invention. Similarly to FIG. 4A-1, it is shown that the higher the dot density, the higher the wind speed, and the lower the dot density, the lower the wind speed.

  As shown in this figure, since the guide groove 12 is unlikely to become an air resistance inside the defroster nozzle 10, there is no place where the wind speed decreases due to the presence of the guide groove 12. As a result, when the defroster nozzle 10 is used, it is possible to efficiently control the airflow while suppressing wind noise.

  On the other hand, in the conventional defroster nozzle 110 provided with the guide fins 112 shown in FIG. 4 (B-2), the guide fins 112 have air resistance. As a result, it becomes difficult to blow air-conditioned air uniformly. Further, in the inside of the defroster nozzle 100 without the guide member shown in FIG. 4C-2, the wind speed distribution is approximately the same as that of the defroster nozzle 10 of the present invention.

  FIG. 5A-1 shows a wind speed distribution on the side surface of the windshield glass 34 in the defroster device 13 using the defroster nozzle 10 according to the embodiment of the present invention.

  The wind speed distribution on the side surface of the passenger compartment of the windshield glass 34 is such that the air-conditioned air is guided in a desired direction by the guide groove 12, and there is little variation in the wind speed, and the windshield glass 34 is uniformly blown onto the surface of the windshield glass 34.

  On the other hand, in the conventional defroster nozzle 110 provided with the guide fins 112 shown in FIG. 5B-1, since the guide fins 112 have air resistance, the wind speed decreases near the guide fins 112 and air conditioning. It is difficult to blow air uniformly on the surface of the windshield glass 34. Alternatively, in the defroster nozzle 100 without the guide member shown in FIG. 5C-1, since the airflow is not guided, only a specific part has a part where the wind speed is fast or a part where there is little blowing, etc. In both cases, unevenness is likely to occur, and uniform air-conditioning air blowing over the entire windshield glass 34 is difficult.

  FIG. 5A-2 shows a wind speed vector viewed from the front-rear direction of the vehicle body in the vicinity of the outlet 16 of the defroster nozzle 10 according to the embodiment of the present invention.

  The wind speed vector (arrow 17) in the vicinity of the blower outlet 16 viewed from the front-rear direction of the vehicle body is guided in a desired direction by the guide groove 12, and the wind speed and the wind direction are less varied and blown uniformly from the blower outlet 16.

  On the other hand, in the conventional defroster nozzle 110 provided with the guide fins 112 shown in FIG. 5B-2, the variation in the wind direction indicated by the wind speed vector (arrow 117) is small. Therefore, the wind speed is reduced in the vicinity of the guide fin 112. Alternatively, in the defroster nozzle 100 without the guide member shown in FIG. 5C-2, the airflow of the air-conditioning air blown out from the air-conditioning unit 32 is sufficiently controlled as indicated by the wind speed vector (arrow 117) because the airflow is not guided. However, the wind speed is high only near the center in the vehicle width direction, and unevenness is likely to occur in both the wind direction and the wind speed, and uniform air-conditioning air blowing is difficult.

  The embodiments of the present invention have been described above with reference to the embodiments. However, these embodiments are merely examples, and various modifications can be made without departing from the scope of the invention. Further, it goes without saying that the scope of rights of the present invention is not limited to these embodiments and can be implemented in various modes without departing from the gist of the present invention.

  That is, in the above embodiment, the defroster nozzle structure that rectifies the airflow from the air conditioner unit provided in front of the passenger compartment to the windshield glass is taken as an example, but the present invention is not limited to this, and the member having a bent flow path, The present invention can be applied to any structure that controls the direction of the fluid flowing on the flow path surface of the bent portion. For example, the present invention can be applied to application to a center air conditioner and airflow direction control to a side window.

It is a perspective view showing a defroster device provided with a defroster nozzle structure concerning an embodiment of the present invention. It is sectional drawing which expanded the defroster nozzle structure shown by FIG. 1, and showed the principle of this invention. It is the figure which expanded the inside of the defroster nozzle structure shown by FIG. 1, and showed the pressure loss for every area by the comparison with the conventional structure. It is a figure which shows the wind speed vector in the blower outlet vicinity of the defroster nozzle structure which concerns on embodiment of this invention, and an internal wind speed distribution. It is a figure which shows the wind speed vector in the blower outlet vicinity of the conventional defroster nozzle structure, and an internal wind speed distribution. It is a figure which shows the wind speed vector in the blower outlet vicinity of the conventional defroster nozzle structure, and an internal wind speed distribution. It is a figure which shows the wind speed vector in the blower outlet vicinity of the defroster nozzle structure which concerns on embodiment of this invention, and the wind speed distribution in the windshield glass surface. It is a figure which shows the wind speed vector in the blower outlet vicinity of the conventional defroster nozzle structure, and the wind speed distribution in the windshield glass surface. It is a figure which shows the wind speed vector in the blower outlet vicinity of the conventional defroster nozzle structure, and the wind speed distribution in the windshield glass surface.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Defroster nozzle 11 Car compartment 12 Guide groove 13 Defroster device 14 Inlet 16 Outlet 18 Current plate 20A Wall 20B Wall 20C Inner surface 30 Instrument panel 32 Air-conditioner unit 34 Windshield glass 112 Guide fin

Claims (2)

A defroster nozzle that is provided in front of the vehicle body of the passenger compartment and communicates with an air conditioner unit that blows out an air current, and blows upward from the lower body side of the vehicle body along the side surface of the windshield glass while expanding the air current in the vehicle width direction. ,
A guide groove which is provided on the inner surface of the defroster nozzle, and which is recessed outside the cross section of the defroster nozzle along the guide direction of the airflow;
Defroster nozzle structure with The air conditioner unit blows out the airflow upward in the vehicle body,
The defroster nozzle structure according to claim 1, wherein the guide groove is provided on an inner surface of a bent portion where the defroster nozzle deflects the airflow forward of a vehicle body.