JP4436610B2 - Air conditioner for vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle air conditioner.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is a vehicle air conditioner that has a uniform wind speed distribution to prevent noise generation (see, for example, Patent Document 1). In this air conditioner, a turning guide is provided on the air flow downstream side of the cooling fin, and the turning direction by the turning guide is changed in accordance with the pressure loss of the ventilation system.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-25442
[Problems to be solved by the invention]
However, in the vehicle air conditioner, in order to change the direction of turning by the turning guide, a separate drive mechanism is required, which complicates the structure and invites an increase in cost.
[0005]
Therefore, an object of the present invention is to provide a vehicle air conditioner that can appropriately prevent the generation of noise in spite of a simple and inexpensive configuration.
[0006]
As a means for solving the above problems, the present invention provides:
In a vehicle air conditioner that introduces inside air or outside air by driving a fan arranged in a blower unit, adjusts the temperature with a heat exchanger arranged in a temperature control unit, and then blows air into the vehicle.
The blower unit includes a main body in which the fan is accommodated, and a blower extending from an opening of the main body.
The air blowing part includes a flow channel expansion region having an inclined surface that gradually expands a flow channel cross-sectional area toward the temperature control unit at a connection portion with the main body,
The flow path expansion region extends from the part of the wall surface constituting the opening of the main body along the air flow so as to cover the inclined surface, and the minimum necessary protrusion capable of preventing separation of the passing air. Forming a guide piece having dimensions ,
The projecting dimension of the guide piece is changed according to the spread angle of the inclined surface .
[0007]
With this configuration, even if a flow path expansion region is formed so that a temperature control unit having a flow path cross-sectional area sufficient to dispose a heat exchanger on the downstream side of the blower unit can be connected, air is Since peeling can be prevented, the generation of abnormal noise can be appropriately prevented.
[0008]
In the flow path enlarged region, a resistor is disposed at a position that is a predetermined distance downstream from the guide piece , and a heat radiating plate for a heat generating component is disposed in the blower unit, while preventing the generation of abnormal noise. It is preferable in that it is possible to effectively cool a heat generating component such as the above.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments according to the present invention will be described below with reference to the accompanying drawings.
[0011]
1 to 3 show an air conditioning unit of a vehicle air conditioner according to the present embodiment. The air conditioning unit includes an upstream blower unit 1 and a temperature control unit 2 connected to the blower unit 1.
[0012]
The blower unit 1 includes a cylindrical main body 3 and a blower section 4 extending in a substantially tangential direction from the outer peripheral portion of the main body 3.
[0013]
A sirocco fan 5 is rotatably accommodated in the main body 3. The sirocco fan 5 has a cylindrical shape and includes a plurality of fins on the outer peripheral portion. The sirocco fan 5 rotates by driving a fan motor 6 disposed outside the main body 3, and sucks air into the central portion to form an air flow to the blower portion 4. The drive control of the fan motor 6 is performed by various electronic components mounted on the printed circuit board. In the electronic component, heat generated from the heat generating component 14 such as a power MOS FET or a register is radiated by the plurality of heat radiating plates 7 arranged in parallel.
[0014]
The blower section 4 has an enlarged flow path cross-sectional area at two locations: a connection portion (first connection portion) 8 to the main body 3 and a connection portion (second connection portion) 9 to the tip opening, that is, the temperature control unit 2. ing. In the 1st connection part 8, the bottom face is the inclined surface 10 which inclines toward the downward direction gradually. Moreover, the guide piece 11 protrudes in the 1st connection part 8 toward the horizontal direction so that the inclined surface 10 may be covered. The projecting dimension of the guide piece 11 is set to a value that can prevent separation of the passing air. For example, when the inclination angle of the inclined surface 10 is 60 °, as a result of the experiment, noise (SPL: Sound Pressure Level) is obtained by setting the protruding dimension of the guide piece 11 to 13 mm as shown in the graph of FIG. Was able to be suppressed to the extent that passengers were not concerned. That is, the protrusion dimension of the guide piece 11 can be set to a minimum necessary value according to the difference in the inclination angle of the inclined surface 10, and an unnecessarily large size is prevented.
[0015]
Moreover, in the ventilation part 4, the said heat sink 7 protrudes in the intermediate part 12 between the 1st connection part 8 and the 2nd connection part 9 along an air flow. In this case, a predetermined gap dimension is formed between the heat sink 7 and the guide piece 11. Here, the gap dimension between the heat sink 7 and the guide piece 11 is set to 5 mm or more. As a result, the air flow at the first connecting portion 8 spreads to the lower side beyond the guide piece 11. That is, the air flow can be formed also in the lower part of the heat sink 7 while preventing the generation of noise that cannot be avoided if only the inclined surface 10 is provided, and the heat dissipation effect of the heat sink 7 can be enhanced. Become.
[0016]
The temperature control unit 2 is provided with an evaporator 13 so that the passing air can be cooled. An air mix damper (not shown) is disposed on the downstream side of the evaporator 13 so that the air passing therethrough can be divided. A heater core (not shown) is disposed on one of the air flows diverted by the air mix damper so that the passing air can be heated. Thus, in the temperature control unit 2, one of the air cooled by the evaporator 13 is heated by the heater core, the other is passed as it is, the both are mixed and the temperature is adjusted to a desired temperature, and then blown into the vehicle. ing.
[0017]
In the vehicle air conditioner including the air conditioning unit having the above-described configuration, when the fan motor 6 is driven to rotate the sirocco fan 5, an air flow from the main body 3 toward the blower 4 is formed. In the blower section 4, the flow path cross-sectional area is enlarged at the first connection section 8, but the separation of air is prevented by the guide piece 11, and the generation of abnormal noise is prevented. In addition, since a predetermined gap is formed between the tip of the guide piece 11 and the heat radiating plate 7 protruding from the intermediate portion 12, the air flow from the first connecting portion toward the intermediate portion 12 can be enlarged. An air flow is formed over the entire area of the heat sink 7. Therefore, it is possible to efficiently dissipate heat by the heat radiating plate 7 while preventing the generation of abnormal noise.
[0018]
【The invention's effect】
As is clear from the above description, according to the present invention, since the guide piece is provided in the flow path expansion region, it is possible to accurately blow air into the vehicle without generating abnormal noise. .
[Brief description of the drawings]
FIG. 1 is a partial front sectional view of an air conditioning unit according to the present embodiment.
FIG. 2 is a partial plan sectional view of the air conditioning unit according to the present embodiment.
FIG. 3 is a perspective view showing a lower half side of the blower unit shown in FIGS. 1 and 2;
FIG. 4 is a graph showing the relationship between the protrusion size of a guide piece and noise.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Blower unit 2 ... Temperature control unit 3 ... Main body 4 ... Air blower part 5 ... Sirocco fan 6 ... Fan motor 7 ... Heat sink 8 ... 1st connection part (flow-path expansion area)
DESCRIPTION OF SYMBOLS 9 ... 2nd connection part 10 ... Inclined surface 11 ... Guide piece 12 ... Intermediate | middle part 13 ... Evaporator 14 ... Heat-emitting component

Claims (2)

In a vehicle air conditioner that introduces inside air or outside air by driving a fan arranged in a blower unit, adjusts the temperature with a heat exchanger arranged in a temperature control unit, and then blows air into the vehicle.
The blower unit includes a main body in which the fan is accommodated, and a blower extending from an opening of the main body.
The air blowing part includes a flow channel expansion region having an inclined surface that gradually expands a flow channel cross-sectional area toward the temperature control unit at a connection portion with the main body,
The flow path expansion region extends from the part of the wall surface constituting the opening of the main body along the air flow so as to cover the inclined surface, and the minimum necessary protrusion capable of preventing separation of the passing air. Forming a guide piece having dimensions ,
The vehicle air conditioner characterized in that the protruding dimension of the guide piece is changed according to the spread angle of the inclined surface .   The heat flow component heat dissipating plate is disposed in the blower unit at a position that is a predetermined distance away from the guide piece in the flow path expansion region. Vehicle air conditioner.

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