JP4024974B2 - Air conditioning unit for vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle air conditioning unit, and more particularly to a vehicle air conditioning unit that includes a cooling heat exchanger and a heating heat exchanger, and air is blown from an intake unit to the cooling heat exchanger.
[0002]
[Prior art]
Conventionally, as shown in FIG. 7, the cooling heat exchanger 1 and the heating heat exchanger 2 are arranged in the vertical direction in order to increase the foot space in the vehicle interior and reduce the material, manufacturing, and assembly costs. There is a vehicle air conditioning unit 3. In the vehicle air conditioning unit 3, the cooling heat exchanger 1 is blown from an intake unit (not shown) through a substantially triangular air inlet 4 opened at the lower side of the unit. In the vehicle air conditioning unit 3 shown in FIG. 7, an open / close door 5 is disposed between the cooling heat exchanger 1 and the heating heat exchanger 2. The open / close door 5 controls the amount of air that passes through the heat exchanger 2 for heating and air that is introduced directly downstream of the exchanger 2 for heating. The cooling heat exchanger 1 is disposed and supported in the unit case 6 in an inclined state as shown in the figure in order to make the unit compact. FIG. 8 is a perspective explanatory view showing the vehicle air conditioning unit 3 further downsized. The vehicle air conditioning unit 3 shown in the figure has a configuration in which the open / close door 5 of the vehicle air conditioning unit 3 shown in FIG. 7 is replaced with a slide door 7 and achieves space saving in the vertical direction.
[0003]
[Problems to be solved by the invention]
However, the air introduced from the air inlet 4 of the vehicle air conditioning unit 3 described above is narrow and the air blown from the wide portion of the air inlet 4 because the cooling heat exchanger 1 is inclined. There is a problem in that the pressure of the air blow becomes uneven with respect to the lower surface of the cooling heat exchanger 1 due to the action of the air blow introduced from.
[0004]
That is, when the air blowing state on the bottom surface 8 of the unit case 6 shown in FIG. 8 is viewed in plan, the air flow introduced from the wide opening portion of the air introduction port 4 and the narrow opening portion as shown in FIG. In the same figure, due to the quantitative difference from the flow of air introduced from the air and the ventilation resistance becomes asymmetrical between the engine room side and the vehicle compartment side of the space below the cooling heat exchanger 1 A counterclockwise swirling flow is generated. For this reason, the center of the cooling heat exchanger 1 is a position corresponding to the center of the swirl flow, and the air pressure decreases at the center of the cooling heat exchanger 1 and it is difficult for the wind to pass through. As shown in FIG. 9, the air introduced from the position A collides with the case side wall at the position B to increase the pressure, and also collides with the case side wall at the position C to increase the pressure. Further, at the position D shown in FIG. 9, since the air introduced from the narrow opening portion of the air introduction port 4 collides with the air introduced from the wide opening portion and swirled, the pressure becomes high. In the figure, the stipple region shows a region where the pressure is high. FIG. 10 shows the relationship between the positions A to E on the case bottom surface 8 and the height from the case bottom surface 8 to the lower surface of the cooling heat exchanger 1, and the wind passing through the cooling heat exchanger 1 at each position. Indicates the state. As shown in the figure, it can be seen that the amount of air passing through the cooling heat exchanger 1 increases in the region from the position B to the position C and the position D where the winds collide with each other.
[0005]
As described above, when the air flow through the cooling heat exchanger 1 becomes uneven, the cooling heat exchanger 1 is adversely affected such as a decrease in the amount of heat exchange or a deterioration in spatial harmony characteristics. was there.
[0006]
Further, as shown in FIG. 9, the unit case is provided with a drain pipe 9 on a side wall portion on the engine room side at a lower position opposite to the space introduction port 4. The drain pipe 9 discharges condensed water generated in the cooling heat exchanger 1 to the engine room side. However, as shown in the figure, since the air introduced onto the case bottom surface 8 generates a swirling flow, the condensate easily stagnates at the position C due to the swirling flow, and the drainage efficiency to the drain pipe 9 There was a problem that decreased.
[0007]
Accordingly, the present invention has been made in consideration of the above-described circumstances, and provides a vehicle air conditioning unit that can make the pressure of the air introduced into the heat exchanger for cooling uniform and has good drainage efficiency. It is an object.
[0008]
[Means for Solving the Problems]
In the first aspect of the present invention, a cooling heat exchanger and a heating heat exchanger are disposed in the unit case, the cooling heat exchanger is disposed on the lower side, and the heating heat exchanger is disposed on the upper side. The cooling heat exchanger is disposed with the air passage surface inclined in one direction in the vehicle front-rear direction with respect to the bottom surface of the unit case, and the unit case positioned on one side in the vehicle width direction. An air inlet is formed in the lower portion of the side wall so as to open substantially the entire side surface of the space formed by the cooling heat exchanger and the bottom surface, and the vehicle is supplied with air through the air inlet. An air conditioning unit, wherein a wind direction changing wall for changing the flow of air introduced from a region having a long opening height of the air introduction port in an oblique direction with respect to the front of the air introduction direction, a center of the bottom surface Stand slightly in front of the air introduction direction And,該風direction changing wall, characterized in that a side of the jetty portion of substantially triangular prism shape.
[0009]
In the first aspect of the invention, the air flow introduced from the region having a long opening height dimension (the region having a wide mouth) of the air introduction port is a wind direction changing wall surface erected on the bottom surface of the unit case. In this case, since the air is guided obliquely with respect to the air introduction direction, the air is pressurized at a position slightly in front of the wind direction changing wall surface, that is, in a region passing through the center of the bottom surface. As a result, the wind speed of the air passing through the center of the cooling heat exchanger can be increased. In addition, the air flow introduced from the area with a short opening height of the air inlet (the narrow area of the mouth) does not hit the wind direction wall that stands on the bottom of the unit case, but changes the wind direction on the wind direction wall. It joins with the wind, and meanders along the back side of the wind direction changing wall surface and hits one case side wall in the vehicle front-rear direction to increase the pressure. As a result, the pressure of the air can be increased from the region where the air is merged to the region corresponding to the case side wall, and the wind speed of the air passing through the region of the cooling heat exchanger corresponding to these regions can be increased. . In particular, according to the present invention, the air flows do not collide with each other in the bottom face of the unit case, energy loss due to the collision does not occur, and the reduction in ventilation resistance can be suppressed. As a result, the wind speed of the air passing through the entire surface of the cooling heat exchanger can be made uniform.
In addition, since a narrow space in which air flows along the air introduction direction can be formed between the jetty and the lower surface of the heat exchanger for cooling, the air introduced from the air introduction direction is pressurized in this space, The air wind speed in the region of the cooling heat exchanger located above the jetty can be increased, and the air speed can be made uniform over the entire passage surface of the cooling heat exchanger.
[0010]
The invention according to claim 2 is the vehicle air conditioning unit according to claim 1, wherein the upper edge of the wind direction changing wall surface is positioned below a predetermined dimension with respect to the lower surface of the cooling heat exchanger. And substantially parallel.
[0011]
Therefore, in addition to the operation of the invention described in claim 1, the invention described in claim 2 is a space that hits the wind direction changing wall surface by setting the upper edge of the wind direction changing wall surface and the lower surface of the cooling heat exchanger in parallel. According to the height dimension of the space inlet where the air is introduced, there is an effect of making the pressure increasing action uniform over the entire wind direction changing wall surface. In addition, by separating the upper edge of the wind direction changing wall surface from the lower surface of the cooling heat exchanger by a predetermined distance, air can be passed to the cooling heat exchanger even above the wind direction changing wall surface. It does not interfere with the uniform wind speed of the air passing through the vessel.
[0014]
The invention according to claim 3 is the air conditioning unit for vehicle according to claim 1 or claim 2 , wherein one side of the jetty portion has a long height of the air inlet of the unit case. It is provided in close proximity so as to be substantially parallel to one side wall in the vehicle front-rear direction on the side where the side is located.
[0015]
Therefore, in the invention according to claim 3 , in addition to the action of the invention according to claim 1 or 2 , by making one side surface of the substantially triangular prism-shaped jetty parallel and close to the side wall of the unit case, A meandering flow path that bypasses the jetty can be formed in the space above the bottom of the unit case, air can flow into the back of the jetty, and the wind speed passing through the cooling heat exchanger Can be made more uniform.
[0016]
Furthermore, the invention according to claim 4 is the vehicle air conditioning unit according to any one of claims 1 to 3 , wherein the cooling heat exchanger is passed above the cooling heat exchanger. A mix door that controls the flow area of the heated air to the heating heat exchanger and the flow area of the air that directly passes the cooling heat exchanger to the downstream side of the heating heat exchanger. It is characterized by being.
[0017]
Therefore, in the invention described in claim 4 , in addition to the operation of the invention described in claims 1-3 , the air speed of the air passing through the cooling heat exchanger can be made uniform. Thus, the controllability of the flow path area can be improved.
[0018]
【The invention's effect】
According to the first aspect of the present invention, there is no frontal collision between the air flows in the bottom surface of the unit case, energy loss due to this collision is not generated, and reduction of the ventilation resistance can be suppressed, and heat exchange for cooling This has the effect of equalizing the wind speed of the air passing through the entire surface of the vessel.
In addition, since a narrow space in which air flows along the air introduction direction can be formed between the jetty and the lower surface of the heat exchanger for cooling, the air introduced from the air introduction direction is pressurized in this space, The air wind speed in the region of the cooling heat exchanger located above the jetty can be increased, and the air speed can be made uniform over the entire passage surface of the cooling heat exchanger.
[0019]
According to the second aspect of the present invention, in addition to the effect of the first aspect, the upper edge of the wind direction changing wall and the lower surface of the cooling heat exchanger are set in parallel, so that the space that hits the wind direction changing wall. There is an effect that the pressure increasing action is made uniform over the entire wind direction changing wall surface according to the height dimension of the space introduction port into which the air is introduced. In addition, by separating the upper edge of the wind direction changing wall surface from the lower surface of the cooling heat exchanger by a predetermined distance, air can be passed to the cooling heat exchanger even above the wind direction changing wall surface. The air speed of the air passing through the vessel can be made uniform.
[0021]
According to the invention of claim 3 , in addition to the effect of the invention of claim 1 or claim 2 , by making one side surface of the substantially triangular prism shaped jetty parallel and close to the side wall of the unit case, A meandering flow path that bypasses the jetty can be formed in the space above the bottom of the unit case, air can flow into the back of the jetty, and the wind speed passing through the cooling heat exchanger There is an effect of further improving the homogenization.
[0022]
In the invention according to claim 4 , in addition to the effects of the invention described in claims 1 to 3 , the wind speed of the air passing through the cooling heat exchanger can be made uniform. The controllability of the channel area can be improved, and there is an effect that the air conditioning control can be performed accurately.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, details of an air conditioning unit for vehicles according to the present invention will be described based on embodiments shown in the drawings.
[0024]
Hereinafter, the detail of the air conditioning unit for vehicles which concerns on this invention is demonstrated using embodiment shown in FIGS.
[0025]
FIG. 1 is a cross-sectional view showing a state in which the vehicle air conditioning unit 10 of the present embodiment is cut along a plane passing through the vertical direction and the vehicle front-rear direction, and FIG. 2 shows the vehicle air conditioning unit 10 in the vertical direction and the vehicle width direction. It is sectional drawing which shows the state cut | disconnected by the surface which passes through. In FIG.1 and FIG.2, the code | symbol 11 has shown the unit case. The unit case 11 includes a case lower half part 11A and a case upper half part 11B. FIG. 3 is a perspective view of the case lower half part 11A, and FIG. 4 is a plan view schematically showing the case lower half part 11A. The case lower half 12 is formed with an air inlet 12 for introducing air sent from a blower (not shown) on one side (side wall) in the vehicle width direction.
[0026]
The vehicle air-conditioning unit 10 includes a cooling heat exchanger (evaporator) 13 disposed so as to be inclined forward in the lower part of the unit case 11, and a mix door disposed on the downstream side of the cooling heat exchanger 13. The sliding door device 14, the heating heat exchanger (heater core) 15 disposed on the downstream side of the sliding door device 14, the cooling heat exchanger 13, and the heating heat exchanger 15 are disposed on the downstream side. Opening and closing doors 16 and 17 are provided.
[0027]
The sliding door device 14 includes a cross-sectional area of a flow path through which the air that has passed through the cooling heat exchanger 13 passes through the heating heat exchanger 15, and the air that has passed through the cooling heat exchanger 13 is in the heating heat exchanger 15. The cross-sectional area of the flow path directly led to the downstream side is controlled. The cooling heat exchanger 13 includes a refrigerant pipe through which a refrigerant flows and a large number of fins (all not shown).
[0028]
Further, as shown in FIG. 1, the front part of the cooling heat exchanger 13 in the longitudinal direction of the vehicle is supported by the upper half part 11B of the case with a bracket 18, and the rear part of the cooling heat exchanger 13 is lower part of the case 11A. It is mounted and fixed on the step portion 19.
[0029]
Further, a seal packing 13A is attached between the rear portion of the cooling heat exchanger 13 and the lower half portion 11A of the case so as to be flush with the downstream surface of the cooling heat exchanger 13 in the air flow direction. ing. In this case, by sticking the seal packing 13A so as to be flush with the downstream surface side in the air flow direction, a water storage space for collecting condensed water from the downstream surface side of the cooling heat exchanger 13 does not occur. .
[0030]
In the unlikely event that the stepped portion 19 and the condensed water stored in the stepped portion 19 extend in the width direction of the vehicle, at least the side wall facing the air inlet has a gap between the stepped portion 19 and the side wall. Since a gap or a notch directed toward the drain guide side is provided between them, drainage can be performed. Further, in the structure shown in FIG. 3, the condensed water stored in the step portion 19A of the step portion 19 is smoothly drained by the slit 19B.
[0031]
The cooling heat exchanger 13 communicates with a compressor, a condenser, and an expansion valve (not shown), and the refrigerant discharged from the compressor passes through the condenser and the expansion valve to become an evaporator. 7 constitutes a refrigeration cycle returning to the compressor again.
[0032]
As shown in FIG. 1, the heating heat exchanger 15 is supported above the cooling heat exchanger 13 and the slide door device 14 by a case side wall on the engine room side and both side walls in the width direction. The heating heat exchanger 15 is configured such that heated water heated by an engine (not shown) flows, and when the air passes through the heat exchanger body, heat exchange is performed to heat the air. It has become.
[0033]
As shown in FIG. 1, the air inlet 12 described above is formed in a substantially triangular shape having a high height on the front side and a wide height on the rear side. Further, the cooling heat exchanger 13 is arranged and fixed so as to face each other in a state of being inclined forward with respect to the bottom surface 20 of the case lower half portion 11A.
[0034]
On the bottom surface 20, a substantially triangular prism-shaped jetty portion 21 is provided so as to meander the air flow. As shown in FIG. 4, the jetty portion 21 has a wind direction changing wall surface that forms a predetermined obtuse angle θ toward the rear side in the vehicle longitudinal direction with respect to the direction a of the air flow introduced from the air inlet 12 side. 22. The wind direction changing wall surface 22 is arranged in front of the direction a of the introduced air flow from the center of the bottom surface 20, and the air introduced from the air inlet 12 collides with the wind direction changing wall surface 22 to change the wind direction in FIG. It is made to change to left direction (substantially vehicle rear direction). In addition, a drain pipe 23 is provided at the front lower portion of the front wall 25 of the case lower half portion 11A in the direction a of the introduced air flow, and the bottom surface 20 has a gentle vicinity in the vicinity of the front side edge in the direction a of the introduced air flow. A drain guide groove 24 is formed so as to be inclined downward toward the drain pipe 23 side.
[0035]
As shown in FIG. 1, the jetty portion 21 is formed so that the height is high on the front wall 25 side of the case lower half portion 11 </ b> A and gradually decreases from the front wall 25 side toward the apex 26 located rearward. . As shown in FIG. 4, the triangular vertex 26 on the rear side of the jetty 21 is set to be located slightly rearward from the center of the bottom surface 20.
[0036]
The air conditioning unit 10 for a vehicle having such a configuration has the following effects. As shown in FIG. 5, in the space below the cooling heat exchanger 13, the lower half portion 11 </ b> A of the case, air introduced from the air inlet 12 is blown in with an air volume corresponding to the opening height of the air inlet 12. . Here, the air flow introduced from the position A2 where the air introduction port 12 is high travels straight in the vehicle width direction, hits the wind direction changing wall surface 22 of the jetty 21 at the position A3, and is inclined along the wind direction changing wall surface 22 Flow backwards. At this time, in the vicinity of the wind direction changing wall surface 22, the wind speed of the airflow that passes through the cooling heat exchanger 13 that is increased in pressure and increased is increased. The air flow proceeding from the position A3 to the position A4 hits the rear side wall of the unit case 11 (case lower half 11A) and joins with the straight air introduced from the position A1 where the height of the air inlet 12 is low. Then, it flows to the position A5, hits the side wall of the case lower half part 11A, and flows toward the position A6. For this reason, the airflow flowing in from the position A2 meanders so as to bypass the jetty 21 and flows toward the drain pipe 23 side. As a result, the air flows do not collide with each other as in the conventional case, energy loss is eliminated, and ventilation resistance can be reduced. In addition, the wind speed of the air flow passing through the center of the cooling heat exchanger 13 can be increased, and as a result, the air speed of the air flow passing through the cooling heat exchanger 13 can be made uniform.
[0037]
FIG. 6 is a diagram illustrating a state of an air flow passing through the cooling heat exchanger 13 at positions A2 to A6. The air introduced from the position A2 of the air inlet 12 hits the wind direction changing wall surface 22 to increase the pressure of the wind passing through the cooling heat exchanger 13 between the position A3 and the position A4. At positions A5 and A6, since the air hits the side wall, the pressure increases and the wind speed of the air passing through the cooling heat exchanger 13 at these positions increases. The air introduced from position A1 is pressurized because the space between it and the cooling heat exchanger 13 is narrow, and the wind speed in the space passing through the cooling heat exchanger 13 is high. When these actions are combined, the wind speed in the space passing through the cooling heat exchanger 13 becomes uniform.
[0038]
In the present embodiment, the jetty 21 is formed so that the air pressure is increased at the center of the bottom surface 20 of the case lower half 11A, and the airflow is meandered so that the wind flows toward the drain pipe 23 side. Therefore, there is an effect of guiding the condensed water accumulated on the bottom surface 20 to the drain pipe 23. For this reason, condensed water can be efficiently discharged to the drain pipe 23 side.
[0039]
Although the embodiment has been described above, the present invention is not limited to this, and various modifications accompanying the gist of the configuration are possible.
[0040]
For example, in the above-described embodiment, the jetty portion 21 has a substantially triangular prism shape, but a rib-like plate including the wind direction changing wall surface 22 may be erected.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an embodiment of an air conditioning unit for a vehicle according to the present invention.
FIG. 2 is a front sectional view of the vehicle air conditioning unit of the embodiment.
FIG. 3 is a perspective view showing a lower half of the case of the vehicle air conditioning unit according to the embodiment.
FIG. 4 is a plan view of the lower half of the case of the vehicle air conditioning unit according to the embodiment.
FIG. 5 is an explanatory diagram showing a wind direction state in the embodiment.
FIG. 6 is a diagram showing a wind direction state in the embodiment.
FIG. 7 is an explanatory diagram of a conventional vehicle air conditioning unit.
FIG. 8 is a perspective explanatory view of another conventional vehicle air conditioning unit.
FIG. 9 is an explanatory diagram showing a wind direction state of a conventional vehicle air conditioning unit.
FIG. 10 is a diagram showing a wind direction state of a conventional vehicle air conditioning unit.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Air conditioning unit 11 for vehicles Unit case 12 Air inlet 13 Heat exchanger 14 for cooling 14 Slide door apparatus 15 Heat exchanger 20 for heating Bottom face (case bottom face)
21 Jetty 22 Wind direction change wall

Claims (4)

A cooling heat exchanger (13) and a heating heat exchanger (15) are arranged in the unit case (11), and the cooling heat exchanger (13) is placed on the lower side of the heating heat exchanger ( 15) is disposed on the upper side, and the cooling heat exchanger (13) is disposed with the air passage surface inclined in one direction in the vehicle front-rear direction with respect to the bottom surface (20) of the unit case (11). And substantially the entire side surface of the space formed by the cooling heat exchanger (13) and the bottom surface (20) at the lower portion of the side wall of the unit case (11) located on one side in the vehicle width direction. An air conditioning unit (10) for a vehicle in which an air introduction port (12) is formed so as to open and air is blown through the air introduction port (12),
A wind direction changing wall surface (22) for changing the flow of air introduced from a region having a long opening height dimension of the air introduction port (12) in an oblique direction with respect to the front of the air introduction direction, the bottom surface (20) The air conditioning unit for vehicles is characterized in that the wind direction changing wall surface (22) is a side surface of a substantially triangular prism-shaped jetty (21), and is erected slightly in front of the air introduction direction.   The vehicle air conditioning unit (10) according to claim 1, wherein an upper edge of the wind direction changing wall surface (22) is positioned below a predetermined dimension with respect to a lower surface of the cooling heat exchanger (13), An air conditioning unit for a vehicle characterized by being substantially parallel. It is an air conditioning unit (10) for vehicles of Claim 1 or Claim 2, Comprising: As for the said jetty part (21), one side is the height dimension of the said air inlet (12) of the said unit case (11). The air conditioning unit for vehicles is characterized by being provided in close proximity so as to be substantially parallel to one side wall in the longitudinal direction of the vehicle located on the long side . A vehicle air conditioning unit (10) according to any of claims 1 to 3,
On the upper side of the cooling heat exchanger (13), a flow path area for sending the air that has passed through the cooling heat exchanger (13) to the heating heat exchanger (15), and the heating heat exchanger ( The vehicle air conditioning unit is characterized in that a mix door (14) for controlling a flow passage area for directly sending the air that has passed through the cooling heat exchanger (13) to the downstream side of 15) is disposed.

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