JP4457941B2 - Air conditioner for vehicles - Google Patents

Description

  The present invention relates to a vehicle air conditioner, and is particularly suitable for a vehicle air conditioner in which a blower unit is offset from a side of an air conditioner unit.

  The vehicle air conditioner in which the blower unit is offset to the side of the air conditioning unit has an air flow behind the evaporator 12 and the air flow as shown in FIGS. 10 and 11 in order to improve the temperature control characteristics. A heater core 13 is installed on the downstream side.

Moreover, the hot water piping 50 and 51 which connects between an engine (water cooling internal combustion engine) and the heater core 13 has penetrated the through-hole 41 formed in the dash panel 40 which separates a vehicle interior from the vehicle interior (for example,) , See Patent Document 1).
Japanese Patent No. 3511697

  However, in the conventional vehicle air conditioner, the duct portion 34 that forms the air passage from the blower unit 30 to the air conditioning unit 10 is located between the through hole 41 of the dash panel 40 and the heater core 13, and the hot water pipe 50. , 51 are routed around the duct portion 34, so that there is a problem that the hot water pipes 50, 51 become longer and the cost increases.

  Moreover, since the hot water piping 50 and 51 passes under the duct part 34, a passenger | crew's leg | foot is easy to contact the exposed hot water piping 50 and 51. FIG. Therefore, in order to prevent the occupant from coming into contact with the hot water pipes 50 and 51 and being burned, a cover for covering the hot water pipes 50 and 51 is required, which increases the cost.

  An object of this invention is to simplify a hot-water piping layout and to reduce a cost in view of the said point.

In order to achieve the above object, according to the first aspect of the present invention, the vehicle is mounted on a vehicle in which through holes (41, 81) are formed in a panel (40, 80) that separates the interior of the vehicle from the exterior of the vehicle. A blower fan (33) that blows air toward the room, a cooling heat exchanger (12) that cools the air blown by the blower fan (33), and air that has passed through the cooling heat exchanger (12). A heating heat exchanger (13) for heating with warm water, and a duct portion (34) for guiding the blown air of the blower fan (33) to the cooling heat exchanger (12), the blower fan (33), and cooling The heat exchanger for heating (12), the heat exchanger for heating (13), and the duct portion (34) are arranged in the vehicle interior, and the duct is formed between the through holes (41, 81) and the heat exchanger for heating (13). Section (34) is disposed between the hot water heat source outside the passenger compartment and the heating heat exchanger (13). Connect the penetration in the vehicular air conditioner two hot water pipes which circulate the (50, 51) is passed through the through hole (41, 81) of hot water, hot water piping (50, 51) of the duct portion (34) The duct portion (34) is characterized in that the passage cross-sectional area increases along the air flow (C) in the duct portion (34) .

  According to this, since it is not necessary for the hot water piping to bypass the duct portion, the hot water piping layout can be simplified, the hot water piping can be shortened, and the cost can be reduced.

  Further, since the hot water pipe does not pass below the duct portion, there is almost no possibility that the occupant's feet come into contact with the hot water pipe. Therefore, a cover for covering the hot water pipe becomes unnecessary, and the cost can be reduced.

In addition, it is usually necessary to fix the hot water pipe in the middle, and a clamp is required. However, the clamp can be eliminated by sandwiching the hot water pipe between the ducts, and the cost can be greatly reduced. Furthermore, since the wind speed in the duct portion decreases due to an increase in the cross-sectional area of the passage, an increase in pressure loss due to the hot water piping penetrating the duct portion can be reduced.

Incidentally, as in the invention according to claim 4 , the cooling heat exchanger (12) and the heating heat exchanger (13) are arranged in a substantially central portion in the vehicle left-right direction in the inside of the instrument panel in front of the passenger compartment. In the vehicle air conditioner in which the blower fan (33) is disposed on the side of the vehicle left-right direction of the cooling heat exchanger (12) and the heating heat exchanger (13), the duct portion has a through-hole in the panel. And between the heat exchanger for heating. Therefore, the invention according to claim 1 is suitable for the vehicle air conditioner according to claim 4 .

  According to a second aspect of the present invention, in the vehicle air conditioner according to the first aspect, the two hot water pipes (50, 51) in the duct part (34) are air in the duct part (34). It extends in a direction perpendicular to the flow (C) and is arranged in series along the air flow (C) in the duct portion (34).

  According to this, since the two hot water pipes in the duct portion are arranged in series along the air flow direction, the pressure loss can be reduced as compared with the case where they are arranged in parallel.

According to a third aspect of the present invention, in the vehicle air conditioner according to the first or second aspect , the cooling heat exchanger (12) cools air with a refrigerant of a refrigeration cycle, and circulates the refrigerant. The refrigerant pipes (60, 61) to be passed through the through holes and the duct part (34), and are arranged on the downstream side of the air flow (C) of the hot water pipes (50, 51) in the duct part (34). It is characterized by that.

  According to this, the blown air that collided with the hot water pipe branches into two flows with high wind speed, and the air flow downstream side of the hot water pipe has a low wind speed. That is, since the wind speed is low in the portion where the refrigerant pipe is arranged, an increase in pressure loss due to the refrigerant pipe penetrating the duct portion can be reduced.

  Normally, the refrigerant pipe also uses a sub refrigerant pipe separate from the evaporator in order to avoid the duct section. However, if the refrigerant pipe is configured to penetrate the duct section, the refrigerant pipe will be integrated with the evaporator. It can be attached and the cost can be further reduced.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
A first embodiment of the present invention will be described. 1 is a plan sectional view schematically showing a vehicle air conditioner according to a first embodiment of the present invention, FIG. 2 is a schematic sectional view taken along line AA in FIG. 1, and FIG. It is sectional drawing which follows the -B line.

  The air conditioner of this embodiment is applied to a vehicle in which an engine (water-cooled internal combustion engine) is mounted in an engine room provided in front of the passenger compartment.

  The air conditioner according to the present embodiment has a so-called semi-center layout, and the air conditioning unit 10 is arranged at a substantially central portion in the vehicle left-right direction inside the instrument panel in front of the passenger compartment. A blower unit 30 that blows air to the air conditioning unit 10 is disposed offset to the side of the air conditioning unit 10 (passenger seat side). In addition, the arrow of FIGS. 1-3 has shown the mounting direction of the air conditioning unit 10 and the air blower unit 30 with respect to the up-down, left-right, and front-back direction of a vehicle.

  As shown in FIGS. 1 and 2, the blower unit 30 has a resin blower case 31, and a centrifugal blower fan 33 driven by an electric motor is housed in a scroll casing 32 of the blower case 31. ing. As is well known, an inside / outside air switching box (not shown) for switching and introducing inside air or outside air is arranged on the upstream side of the air flow of the blower fan 33.

  The blower case 31 is integrally formed with a duct portion 34 that forms an air passage that guides the air blown from the blower fan 33 to the air conditioning unit 10. The upper and lower surfaces of the duct portion 34 are tapered along the air flow C in the duct portion 34 (hereinafter referred to as “in-duct air flow C”). The cross-sectional area of the passage in the portion 34 is increased.

  As shown in FIG. 3, the air conditioning unit 10 has a resin air conditioning case 11, and an air inlet portion 14 into which the air blown from the blower unit 30 flows is formed at the most front side of the air conditioning case 11. ing.

  An evaporator 12 is disposed in the air conditioning case 11 on the vehicle rear side of the air inlet portion 14. The evaporator 12 is arranged substantially vertically so as to cross the passage in the air conditioning case 11 in a thin shape in the vehicle front-rear direction. As is well known, the evaporator 12 absorbs the latent heat of evaporation of the refrigerant in the refrigeration cycle from the air to cool the air, and corresponds to the cooling heat exchanger of the present invention.

  A heater core 13 is arranged at a predetermined interval on the downstream side of the air flow of the evaporator 12 and on the rear side of the vehicle. The heater core 13 is disposed on the lower side in the air conditioning case 11 so that the upper end of the heater core 13 recedes toward the vehicle rear side and is slightly inclined. The heater core 13 heats air using engine cooling water (hot water) (not shown) disposed in the engine room as a heat source fluid, and corresponds to a heating heat exchanger of the present invention. The engine corresponds to the hot water heat source of the present invention.

  A cold air bypass passage 15 is formed in the upper part of the heater core 13, and a plate-like air mix door 16 is disposed on the immediately downstream side (rear side of the vehicle) of the evaporator 12 so as to be rotatable about the rotation shaft 16a. . The air mix door 16 adjusts the air volume ratio between the cold air passing through the cold air bypass passage 15 and the hot air passing through the core portion 13a of the heater core 13 to adjust the temperature of air blown into the vehicle interior to a desired temperature. is there.

  A hot air passage 17 directed upward is formed immediately after the heater core 13, and the hot air from the hot air passage 17 and the cold air from the cold air bypass passage 15 are mixed by the air mixing unit 18.

  A plurality of outlet openings are formed on the air flow downstream side of the air conditioning case 11. The defroster opening 19 in the blowout opening is open at a substantially central portion in the vehicle front-rear direction on the upper surface of the air conditioning case 11. And this defroster opening part 19 blows off air toward the inner surface of a vehicle front window glass through the defroster duct which is not shown in figure. The defroster opening 19 is opened and closed by a plate-like defroster door 20 that can be rotated about a rotation shaft 20a.

  The face opening 22 opens at a position on the rear side of the vehicle with respect to the defroster opening 19 on the upper surface of the air conditioning case 11. And this face opening part 22 blows off air toward the passenger | crew's head in a vehicle interior via the face duct which is not shown in figure. The face opening 22 is opened and closed by a plate-like face door 23 that can rotate around a rotation shaft 23a.

  The foot opening 24 opens to the lower side of the face opening 22 in the air conditioning case 11, and the downstream side of the foot opening 24 communicates with the foot outlets 25 arranged on the left and right sides of the air conditioning case 11, Hot air is blown out from the foot outlet 25 to the feet of the passengers. The foot opening 24 is opened and closed by a plate-like foot door 26 that can rotate around a rotation shaft 26a.

  As shown in FIG. 1, there is a dash panel 40 that separates the vehicle interior from the engine room (outside the vehicle compartment) in front of the air conditioning unit 10 and the blower unit 30, and the dash panel 40 includes a vehicle having a duct portion 34. A through hole 41 is formed in the front portion. Thereby, the duct part 34 is located between the through hole 41 and the heater core 13.

  The air conditioner includes two hot water pipes 50 and 51 for circulating engine coolant between the heater core 13 and the engine.

  One end of the two hot water pipes 50 and 51 is connected to the side surface of the heater core 13 on the side of the blower unit 30. Then, the two hot water pipes 50 and 51 extend out of the air conditioning case 11 from the connection portion with the heater core 13, extend toward the vehicle front side, pass through the duct portion 34, and further pass through the through hole 41. And connected to the engine coolant circuit. The gap between the hot water pipes 50 and 51 in the duct portion 34 and the hot water pipes 50 and 51 is blocked by packing (not shown).

  As shown in FIGS. 1 and 2, the two hot water pipes 50 and 51 in the duct portion 34 extend in a direction perpendicular to the air flow C in the duct and are along the air flow C in the duct. Are arranged in series.

  Further, the two hot water pipes 50 and 51 in the duct portion 34 are located on the downstream side of the substantially intermediate position in the air flow direction in the duct portion 34. In other words, the two hot water pipes 50 and 51 are disposed in a portion of the duct portion 34 having a large passage cross-sectional area.

  Here, by making the vehicle left-right direction position and vertical position of the hole through which the hot water pipes 50, 51 penetrate in the duct part 34 and the vehicle left-right direction position and vertical position of the through hole 41 substantially the same, the duct part In the vicinity of 34 and the through hole 41, the hot water pipes 50 and 51 can be arranged linearly.

  In the present embodiment, since the hot water pipes 50 and 51 pass through the duct part 34 without bypassing the duct part 34, the layout of the hot water pipes 50 and 51 can be simplified, 51 can be shortened and cost reduction can be achieved.

  Further, since the hot water pipes 50 and 51 do not pass below the duct portion 34, there is almost no possibility that the occupant's feet come into contact with the hot water pipes 50 and 51. Therefore, a cover for covering the hot water pipes 50 and 51 becomes unnecessary. You can go down.

  In addition, it is usually necessary to fix the hot water pipes 50 and 51 in the middle, and a clamp is necessary. However, the clamps can be eliminated by sandwiching the hot water pipes 50 and 51 with the duct portion 34, which greatly reduces the cost. Is possible.

  In addition, the two hot water pipes 50 and 51 in the duct portion 34 extend in a direction orthogonal to the air flow C in the duct and are arranged in series along the air flow C in the duct. The pressure loss can be made smaller than when arranged in parallel.

  Further, since the two hot water pipes 50 and 51 in the duct portion 34 are arranged in the duct portion 34 at a portion where the passage cross-sectional area is large and the wind speed is reduced, the hot water pipes 50 and 51 are arranged in the duct portion. An increase in pressure loss due to penetrating 34 can be reduced. Incidentally, when the hot water pipes 50 and 51 are arranged downstream of the intermediate position in the air flow direction in the duct portion 34 and the influence on the performance is confirmed by experiments, the maximum air volume (face mode, max school, inside air mode) is confirmed. ), It was confirmed that the pressure loss increased by 20 to 30 (Pa), and the air volume was reduced by 2 to 5%.

(Second Embodiment)
A second embodiment of the present invention will be described. FIG. 4 is a plan sectional view schematically showing a vehicle air conditioner according to a second embodiment of the present invention, and FIG. 5 is a schematic sectional view taken along the line DD of FIG. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 1st Embodiment, and the description is abbreviate | omitted.

  In the first embodiment, only the hot water pipes 50 and 51 pass through the duct part 34, but in this embodiment, the hot water pipes 50 and 51 and the refrigerant pipes 60 and 61 pass through the duct part 34. .

  As shown in FIGS. 4 and 5, one end of the two refrigerant pipes 60 and 61 for circulating the refrigerant of the refrigeration cycle is connected to the side surface of the evaporator 12 on the side of the blower unit 30. The two refrigerant pipes 60 and 61 extend out of the air conditioning case 11 from the connection portion with the evaporator 12, and then extend toward the vehicle front side and penetrate the duct portion 34.

  A joint 62 is joined to the other ends of the two refrigerant pipes 60, 61. A part of the joint 62 is located inside the duct part 34, and the remaining part is located outside the duct part 34. An expansion valve 63 is attached to the joint 62 at a portion outside the duct portion 34. In addition, the gap between the hole through which the refrigerant pipes 60 and 61 penetrate in the duct portion 34 and the refrigerant pipes 60 and 61 is closed by packing (not shown).

  The two refrigerant pipes 60 and 61 in the duct portion 34 are arranged on the downstream side of the air flow C in the duct of the hot water pipes 50 and 51. Further, the two refrigerant pipes 60 and 61 in the duct portion 34 extend in a direction orthogonal to the air flow C in the duct and are arranged in parallel to the air flow C in the duct.

  In the present embodiment, the same effects as those of the first embodiment are obtained, and the following effects are further obtained.

  First, in order to avoid the duct part 34, the refrigerant pipes 60 and 61 usually use a sub refrigerant pipe separate from the evaporator 12, but the refrigerant pipes 60 and 61 are configured to penetrate the duct part. The refrigerant pipes 60, 61 can be integrally brazed to the evaporator 12, and further cost reduction is possible.

  The blown air that collides with the hot water pipes 50 and 51 branches into two flows with high wind speed, and the downstream side of the air flow C of the hot water pipes 50 and 51 has a low wind speed. And since the refrigerant | coolant piping 60 and 61 are arrange | positioned in the site | part where the wind speed becomes low, the pressure loss increase by the refrigerant | coolant piping 60 and 61 penetrating the duct part 34 can be decreased.

  Incidentally, FIG. 6 shows a result of confirming an increase in pressure loss due to the refrigerant pipes 60 and 61 penetrating through the duct portion 34 by experiments.

  Here, of the two hot water pipes 50 and 51, the distance L in the duct air flow C direction from the hot water pipe 50 upstream of the duct air flow C to the refrigerant pipes 60 and 61 is set to 50 mm. The width W in the vertical direction of the refrigerant pipes 60 and 61 was set to 45 mm.

  The distance X between the center of the hot water pipes 50 and 51 and the center of the upper refrigerant pipe 60 in the direction orthogonal to the air flow direction C in the duct is used as a parameter at the time of the maximum air volume (face mode, max cool, inside air Mode) pressure loss increase amount was examined. The distance X when the center of the upper refrigerant pipe 60 is located above the centers of the hot water pipes 50 and 51 is set to + (positive), and the center of the upper refrigerant pipe 60 is from the centers of the hot water pipes 50 and 51. Also, the distance X when it is located on the lower side is-(negative).

  As shown in FIG. 6, when the distance X was set to 0 to 40 mm, it was confirmed that there was no increase in pressure loss due to the refrigerant pipes 60 and 61 penetrating the duct portion 34.

(Third embodiment)
A third embodiment of the present invention will be described. FIG. 7 is an exploded view of the vehicle air conditioner according to the third embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 1st Embodiment, and the description is abbreviate | omitted.

  This embodiment relates to a method for assembling the air conditioning unit 10 and the blower unit 30 when the air conditioning unit 10 and the blower unit 30 are separated, in other words, when the air conditioning case 11 and the blower case 31 are separate bodies. is there.

  As shown in FIG. 7, a cut portion 35 for sandwiching two hot water pipes 50 and 51 is formed on the side surface of the air duct case 11 side of the duct portion 34 of the blower case 31. When the air conditioning unit 10 and the blower unit 30 are combined, the two hot water pipes 50 and 51 are inserted into the cut portion 35 so that the two hot water pipes 50 and 51 pass through the duct portion 34. Become.

(Fourth embodiment)
A fourth embodiment of the present invention will be described. FIG. 8 is an exploded view showing a vehicle air conditioner according to a fourth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 1st Embodiment, and the description is abbreviate | omitted.

  In the third embodiment, the air conditioning case 11 and the blower case 31 are separate bodies, but in this embodiment, the case of the air conditioning unit 10 and the blower unit 30 is divided into an upper case 71 and a lower case 72. The present invention relates to a method for assembling the air conditioning unit 10 and the blower unit 30.

  As shown in FIG. 8, a notch 71 a for sandwiching the two hot water pipes 50 and 51 is formed on the bottom surface of the duct portion 34 in the upper case 71. Then, when the upper case 71 and the lower case 72 are joined, the two hot water pipes 50 and 51 are sandwiched between the cut portions 71a, so that the two hot water pipes 50 and 51 pass through the duct portion 34. .

(Fifth embodiment)
A fifth embodiment of the present invention will be described. FIG. 9 is a front sectional view schematically showing a vehicle air conditioner according to a fifth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 1st Embodiment, and the description is abbreviate | omitted.

  Although the air conditioner of each said embodiment was mounted in the vehicle by which the engine was mounted in the engine room provided ahead of the compartment, the air conditioner of this embodiment is below a front seat. It is mounted on a vehicle equipped with an engine.

  As shown in FIG. 9, the air conditioning unit 10 is arranged in a substantially central portion in the left-right direction of the vehicle inside the instrument panel in front of the passenger compartment, and the blower unit 30 is offset to the side of the air conditioning unit 10 (passenger seat side). Yes.

  In the air conditioning case 11, the evaporator 12 is disposed substantially horizontally above the air inlet portion 14. In addition, the heater core 13 is disposed substantially horizontally at a predetermined interval on the air flow downstream side and the upper side of the evaporator 12.

  One end of the two hot water pipes 50 and 51 is connected to the side surface of the heater core 13 on the side of the blower unit 30. The two hot water pipes 50 and 51 come out of the air conditioning case 11 from the connection portion with the heater core 13, then extend downward to penetrate the duct portion 34, and further, the through hole 81 of the floor panel 80. Is connected to a cooling water circuit of an engine (not shown) mounted below the front seat.

  According to this embodiment, the same effect as that of the first embodiment can be obtained in a vehicle in which an engine is mounted below the front seat.

It is a plane sectional view showing typically the air-conditioner for vehicles concerning a 1st embodiment of the present invention. It is typical sectional drawing which follows the AA line of FIG. It is sectional drawing which follows the BB line of FIG. It is a plane sectional view showing typically the air-conditioner for vehicles concerning a 2nd embodiment of the present invention. It is typical sectional drawing which follows the DD line | wire of FIG. It is a figure which shows the evaluation result of the pressure loss in the vehicle air conditioner which concerns on 2nd Embodiment of this invention. It is a figure which decomposes | disassembles and shows the vehicle air conditioner which concerns on 3rd Embodiment of this invention. It is a figure which decomposes | disassembles and shows the vehicle air conditioner which concerns on 4th Embodiment of this invention. It is front sectional drawing which shows typically the vehicle air conditioner which concerns on 5th Embodiment of this invention. It is side surface sectional drawing which shows the conventional vehicle air conditioner typically. It is plane sectional drawing which shows the conventional vehicle air conditioner typically.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 12 ... Evaporator (cooling heat exchanger), 13 ... Heater core (heating heat exchanger), 33 ... Blower fan, 34 ... Duct part, 40, 80 ... Panel, 41, 81 ... Through-hole, 50, 51 ... Hot water piping.

Claims (4)

It is mounted on a vehicle in which through holes (41, 81) are formed in a panel (40, 80) that separates the interior of the vehicle from the exterior of the vehicle,
A blower fan (33) for blowing air toward the passenger compartment;
A cooling heat exchanger (12) for cooling the air blown by the blower fan (33);
A heating heat exchanger (13) for heating the air that has passed through the cooling heat exchanger (12) with hot water;
A duct portion (34) for guiding the blown air of the blower fan (33) to the cooling heat exchanger (12),
The blower fan (33), the cooling heat exchanger (12), the heating heat exchanger (13) and the duct part (34) are arranged in a vehicle interior,
The duct part (34) is disposed between the through hole and the heating heat exchanger (13),
Two hot water pipes (50, 51) for circulating hot water by connecting between a hot water heat source outside the passenger compartment and the heat exchanger (13) for heating pass through the through holes (41, 81). In the air conditioner,
The hot water pipe (50, 51) penetrates the duct part (34) ;
The vehicle air conditioner characterized in that the duct section (34) has a passage sectional area that increases along the air flow (C) in the duct section (34) .   The two hot water pipes (50, 51) in the duct portion (34) extend in a direction orthogonal to the air flow (C) in the duct portion (34), and the duct The vehicle air conditioner according to claim 1, wherein the vehicle air conditioner is arranged in series along an air flow (C) in the section (34). The cooling heat exchanger (12) cools air with a refrigerant of a refrigeration cycle,
The refrigerant pipes (60, 61) for circulating the refrigerant pass through the through hole and the duct part (34), and the air flow (C) of the hot water pipe (50, 51) in the duct part (34). air-conditioning system according to claim 1 or 2, characterized in that disposed on the downstream side. The cooling heat exchanger (12) and the heating heat exchanger (13) are arranged in a substantially central portion in the vehicle left-right direction of the inside of the instrument panel in front of the vehicle interior,
The said blower fan (33) is arrange | positioned in the vehicle left-right direction side of the said heat exchanger for cooling (12) and the said heat exchanger for heating (13), Any one of Claim 1 thru | or 3 characterized by the above-mentioned. The vehicle air conditioner according to claim 1.

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