JP2019119419A - Vehicular air conditioning unit - Google Patents

Abstract

To provide a vehicular air conditioning unit capable of suppressing a change of an air quantity ratio between an outside air passage and an inside air passage caused by penetration of a pipe of a heat exchanger through an air-conditioning case.SOLUTION: A vehicular air conditioning unit 1 includes: an air-conditioning case 12; a cooling heat exchanger 16 for cooling air flowing in the air-conditioning case 12; high-pressure refrigerant piping 54 for supplying a refrigerant to a cooling heat exchanger 16; and low-pressure refrigerant piping 55 for discharging the refrigerant from the cooling heat exchanger 16. A partitioning wall section 13 for defining an upper layer passage 121 for causing outside air to flow in an inside/outside air two-layer mode and a lower layer passage 122 for causing inside air to flow in the inside/outside air two-layer mode is set in the air-conditioning case 12. A through hole 130 through which the high-pressure refrigerant piping 54 and the low-pressure refrigerant piping 55 penetrate is formed on the partitioning wall section 13.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a vehicle air conditioning unit configured to be able to set inside / outside air two-layer mode in which inside air and outside air are divided and flowed.

  Conventionally, in a vehicle air conditioning unit, there is known a configuration in which a pipe connected to a heat exchanger penetrates through an air duct portion disposed between a blower fan and an air distribution housing (for example, Patent Document 1) reference).

Unexamined-Japanese-Patent No. 2014-19439

  The inventors of the present invention have been developing a vehicle air conditioning unit capable of setting inside and outside air two-layer mode in which inside air and outside air are divided and flowed. This type of vehicle air conditioning unit is advantageous in that it is possible to suppress the ventilation loss by the introduction of inside air and suppress the window fogging of the windshield etc. by the introduction of outside air by setting the inside / outside air double layer mode. And in order to make air-conditioning performance and anti-fogging performance compatible at the time of inside-and-outdoor double layer mode, it is necessary to set the amount of wind volume of an open air passage and an inside air passage to a desired ratio.

  However, in a vehicle air conditioning unit capable of setting the inside / outside air two-layer mode, when the heat exchanger pipe is penetrated through one of the outside air passage and the inside air passage, the air flow resistance of one passage is Increase. That is, in the configuration in which each tube of the heat exchanger passes through one of the outside air passage and the inside air passage, the increase in ventilation resistance accompanying the passage of the heat exchanger tube is biased to one of the outside air passage and the inside air passage. It will occur. This causes the air volume ratio of the outside air passage and the inside air passage to largely deviate from the desired ratio, which is not preferable in achieving both the air conditioning performance and the antifogging performance.

  In view of the above-described point, the present disclosure provides a vehicle air conditioning unit capable of suppressing a change in air volume ratio of an outside air passage and an inside air passage caused by causing a heat exchanger pipe to penetrate an air conditioning case.

In order to achieve the above object, the invention according to claim 1 is
A vehicle air conditioning unit configured to be capable of setting inside and outside air two-layer mode in which inside air and outside air are divided and flowed,
An internal air inlet (124, 125) communicating with the vehicle compartment and an external air inlet (123) communicating with the vehicle exterior are formed, and the air introduced from at least one of the internal air inlet and the external air inlet is directed into the vehicle compartment Air conditioning case (12),
A heat exchanger (16, 18) installed inside the air conditioning case for heat exchange between the heat medium and the air flowing inside the air conditioning case to adjust the temperature of the air flowing inside the air conditioning case;
A heat medium supply pipe (19, 54) for supplying a heat medium to the heat exchanger;
And a heat medium discharge pipe (20, 55) for discharging the heat medium from the heat exchanger.

  Inside the air conditioning case, an outside air passage for flowing outside air introduced from the outside air introduction port in the inside / outside air double layer mode, and an inside air passage for flowing inside air introduced from the inside air introduction port in the inside / outside air double layer mode The partition part (13) for section-forming is set. Further, through holes (130) for penetrating the heat medium supply pipe and the heat medium discharge pipe are formed in the partition wall portion.

  As described above, when the heat medium supply pipe and the heat medium discharge pipe are made to penetrate through the through holes provided in the partition wall, the ventilation resistance biased to one of the outside air passage and the inside air passage by each tube of the heat exchanger. Less likely to occur. That is, if the above configuration is adopted, the increase in the ventilation resistance accompanying the penetration of the heat exchanger tubes is enhanced as compared with the configuration in which the heat exchanger tubes are penetrated in one of the outside air passage and the inside air passage. It is possible to suppress one of the outside air passage and the inside air passage from being biased. Therefore, according to the vehicle air conditioning unit of the present disclosure, it is possible to suppress a change in the air volume ratio of the outside air passage and the inside air passage caused by causing the heat exchanger pipe to penetrate the air conditioning case.

  In addition, the code | symbol in the parenthesis of each means described by this column and the claim shows an example of the correspondence with the specific means as described in embodiment mentioned later.

It is a schematic block diagram which shows the mounting state to the vehicle of the air-conditioning unit for vehicles which concerns on 1st Embodiment. It is a typical sectional view of an air-conditioning unit for vehicles concerning a 1st embodiment. It is a schematic diagram which shows the refrigerating-cycle apparatus mounted for vehicles. It is an explanatory view for explaining the flow of the air at the time of the open air mode of the air-conditioning unit for vehicles concerning a 1st embodiment. It is an explanatory view for explaining the flow of the air at the time of interior air mode of the air-conditioning unit for vehicles concerning a 1st embodiment. It is a schematic diagram which shows the air-conditioning unit for vehicles used as the comparative example of the air-conditioning unit for vehicles concerning 1st Embodiment. It is a typical sectional view of an air-conditioning unit for vehicles concerning a 2nd embodiment. It is a typical sectional view of an air-conditioning unit for vehicles concerning a 3rd embodiment. It is a typical sectional view of an air-conditioning unit for vehicles concerning a 4th embodiment. It is a schematic block diagram which shows the mounting state to the vehicle of the air-conditioning unit for vehicles which concerns on 5th Embodiment. It is a typical sectional view of an air-conditioning unit for vehicles concerning a 5th embodiment.

  Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following embodiments, parts that are the same as or equivalent to the items described in the preceding embodiments may be given the same reference numerals, and descriptions thereof may be omitted. In addition, when only a part of the components is described in the embodiment, the components described in the preceding embodiments can be applied to other parts of the components. The following embodiments can be partially combined with each other even if they are not particularly specified as long as there is no problem in particular in the combination.

First Embodiment
The present embodiment will be described with reference to FIGS. 1 to 6. Arrows indicating front and rear in each drawing indicate the front-rear direction DRfr in a state where the vehicle air conditioning unit 1 is mounted on the vehicle C. Arrows indicating left and right in each drawing indicate the left-right direction (that is, the vehicle width direction DRw) in a state where the vehicle air conditioning unit 1 is mounted on the vehicle. Arrows indicating up and down in each drawing indicate up and down directions DRud in a state where the vehicle air conditioning unit 1 is mounted on a vehicle.

  In the present embodiment, an example in which the vehicle air conditioning unit 1 is applied to a vehicle C provided with a steering wheel Hd on the right side in the vehicle width direction DRw will be described. As shown in FIG. 1, in the interior of the vehicle C, an apparatus accommodation room MR in which an apparatus such as an engine EG is accommodated is divided by a dash panel DP and a vehicle interior.

  In the dash panel DP, there are formed pipe lead-in holes H1 and H2 for drawing various pipes connected to the device disposed in the device accommodation room MR into the vehicle compartment. In the dash panel DP of the present embodiment, a first pipe lead-in hole H1 is provided on the right side in the vehicle width direction DRw, and a second pipe lead-in hole H2 is provided on the left side in the vehicle width direction DRw.

  The vehicle air conditioning unit 1 is disposed inside the instrument panel IP at the front of the vehicle interior. That is, the vehicle air conditioning unit 1 is disposed in a space formed in the vehicle compartment between the instrument panel IP and the dash panel DP.

  The air conditioning unit 1 for the vehicle includes a blower unit 10A for blowing air into the vehicle compartment, a temperature control unit 10B for adjusting the temperature of air blown into the vehicle compartment, and a winder that distributes temperature-controlled air into the vehicle compartment. It has a wind distribution unit. In the vehicle air conditioning unit 1 of the present embodiment, a blower unit unit 10A is connected to the air flow upstream side of the temperature control unit unit 10B.

  Further, in the vehicle air conditioning unit 1 of the present embodiment, the temperature control unit 10B is disposed substantially at the center in the vehicle width direction DRw, and the blower unit 10A is offset to the left in the vehicle width direction DRw. ing. That is, the vehicle air conditioning unit 1 of this embodiment has a so-called semi-centered layout. In the vehicle air conditioning unit 1 of the present embodiment, the blower unit unit 10A is offset to the left in the vehicle width direction DRw, so that the connection portion between the blower unit unit 10A and the temperature control unit unit 10B is in the vehicle width direction DRw. It is configured to extend along.

  The vehicle air conditioning unit 1 is configured to be able to set an inside / outside air double-layer mode in which inside air and outside air are divided and flowed. Hereinafter, the internal structure of the air conditioning unit 1 for vehicles of this embodiment is demonstrated with reference to FIG.

  As shown in FIG. 2, the air conditioning unit 1 for vehicles is provided with the air conditioning case 12 which comprises an outer shell. The air conditioning case 12 of the present embodiment is configured to include a blower case portion 12A that configures an outer shell of the blower unit portion 10A and a temperature control case portion 12B that configures an outer shell of the temperature control unit portion 10B.

  The air conditioning case 12 is provided with a partition 13 for partitioning the insides of the blower case 12A and the temperature control case 12B into the upper layer passage 121 and the lower layer passage 122. The upper layer passage 121 constitutes an outside air passage through which outside air flows in the inside / outside air double-layer mode. In addition, the lower layer passage 122 constitutes an inside air passage through which inside air flows in the inside / outside air double-layer mode.

  Further, in the air blowing case portion 12A of the air conditioning case 12, an outside air introduction port 124 for introducing outside air, a first inside air introduction port 125 for introducing inside air into the upper layer passage 121, and a second inside air introduction port for the lower layer passage 122 126 grade is formed. In the blower case portion 12A of the present embodiment, a communication passage 127 for communicating the outside air introduction port 124 with the lower layer passage 122 is set so that the outside air can be introduced also to the lower layer passage 122.

  Further, the blower case 12A includes a first inside / outside air switching door 128 for selectively opening / closing the outside air introduction port 124 and the first inside air introduction port 125, a communication passage 127, and a second inside air introduction port 126. A second inside / outside air switching door 129 which selectively opens and closes is disposed. In FIG. 2, the first inside / outside air switching door 128 opens the outside air introduction port 124 and closes the first inside air introduction port 125, and the second inside / outside air switching door 129 is the second inside air introduction port 126. And the communication passage 127 is closed.

  The first inside / outside air switching door 128 and the second inside / outside air switching door 129 of the present embodiment are each configured by a rotary door. The first inside / outside air switching door 128 and the second inside / outside air switching door 129 may be configured by other doors such as a slide door or a cantilever door.

  An air filter 11 is disposed in the blower case 12A. The air filter 11 is provided to remove foreign substances and the like contained in the air introduced from any of the outside air introduction port 124, the first inside air introduction port 125, and the second inside air introduction port 126.

  On the downstream side of the air flow of the air filter 11 in the air blowing case 12A, a blower 14 for generating an air flow toward the vehicle interior is disposed. Specifically, the blower 14 has an upper layer fan 141 disposed in the upper layer passage 121, a lower layer fan 142 disposed in the lower layer passage 122, and an electric motor 143 for driving the upper layer fan 141 and the lower layer fan 142 to rotate. .

  Further, the blower case 12A is provided with a blower 14 for generating an air flow toward the vehicle interior. Specifically, the blower 14 has an upper layer fan 141 disposed in the upper layer passage 121, a lower layer fan 142 disposed in the lower layer passage 122, and an electric motor 143 for driving the upper layer fan 141 and the lower layer fan 142 to rotate. .

  The upper layer fan 141 and the lower layer fan 142 of the present embodiment are configured by centrifugal fans that blow out the air drawn in from the direction of the axis line CL, which is the rotation center, in the direction intersecting the axis line CL. The upper layer fan 141 and the lower layer fan 142 are configured as an integral molding integrally molded by a molding technique such as injection molding. In the blower case portion 12A, both a portion for housing the upper layer fan 141 and a portion for housing the lower layer fan 142 are formed in a spiral shape.

  The electric motor 143 is fixed to the bottom of the blower case 12A. The electric motor 143 has a rotating shaft 143a that protrudes upward. Both the upper layer fan 141 and the lower layer fan 142 are connected to the rotating shaft 143a by a connecting member (not shown).

  The temperature control case portion 12B is connected to the air flow downstream side of the blower 14 in the blower case portion 12A. As shown in FIG. 1, the temperature control case portion 12 </ b> B accommodates the cooling heat exchanger 16 and the heating heat exchanger 18.

  The cooling heat exchanger 16 is a heat exchanger that cools the air flowing through the inside of the air conditioning case 12 by performing heat exchange between the refrigerant, which is a heat medium, and the air flowing through the inside of the temperature control case 12B of the air conditioning case 12 . As shown in FIG. 2, the cooling heat exchanger 16 is disposed so as to straddle the upper layer passage 121 and the lower layer passage 122 so as to be able to cool both the air flowing through the upper layer passage 121 and the air flowing through the lower layer passage 122. There is.

  The heat exchanger 16 for cooling of this embodiment comprises the refrigerating cycle device 50 of a vapor | steam compression type with the compressor 51, the radiator 52, and the pressure-reduction device 53, as shown in FIG. The cooling heat exchanger 16 is an evaporator that causes the refrigerant to evaporate by heat exchange between the refrigerant decompressed by the decompressor 53 and the air flowing through the inside of the temperature control case portion 12B. The air flowing through the temperature control case portion 12B is cooled by an endothermic effect at the time of evaporation of the refrigerant when passing through the cooling heat exchanger 16.

  As shown in FIG. 1, the compressor 51 and the radiator 52 are accommodated in the device accommodation room MR. The compressor 51 is a device that is driven by an engine EG that generates a driving force for traveling and that compresses a refrigerant. The radiator 52 is a heat exchanger which radiates the refrigerant discharged from the compressor 51 by heat exchange with the outside air.

  Further, the decompressor 53 is disposed in the vehicle cabin together with the cooling heat exchanger 16. The decompressor 53 is a device that decompresses the refrigerant flowing out of the radiator 52. The pressure reducer 53 is disposed adjacent to the cooling heat exchanger 16.

  Here, the refrigerant outlet side of the radiator 52 and the refrigerant inlet side of the decompressor 53 are connected by a high pressure refrigerant pipe 54 through which the high temperature / high pressure refrigerant compressed by the compressor 51 flows. The refrigerant suction side of the compressor 51 and the cooling heat exchanger 16 are connected by a low pressure refrigerant pipe 55 through which the low temperature and low pressure refrigerant flowing out of the cooling heat exchanger 16 flows.

  As a result, the high-temperature and high-pressure refrigerant discharged from the compressor 51 flows through the radiator 52 → the high pressure refrigerant pipe 54 → the pressure reducer 53 → the cooling heat exchanger 16 → the low pressure refrigerant pipe 55 in this order. Inhaled by

  In the present embodiment, the refrigerant is supplied to the cooling heat exchanger 16 via the high pressure refrigerant pipe 54, and the refrigerant is discharged from the cooling heat exchanger 16 via the low pressure refrigerant pipe 55. Therefore, in the present embodiment, the high pressure refrigerant pipe 54 constitutes a heat medium supply pipe for supplying the refrigerant as the heat medium to the heat exchanger 16 for cooling, and the low pressure refrigerant pipe 55 is a heat exchanger for cooling A heat medium discharge pipe for discharging the refrigerant which is a heat medium from 16 is constituted. Further, in the present embodiment, the high pressure refrigerant pipe 54 constitutes a high temperature pipe, and the low pressure refrigerant pipe 55 constitutes a low temperature pipe.

  As shown in FIG. 1, in the refrigeration cycle apparatus 50 according to the present embodiment, the compressor 51 and the radiator 52 are disposed in the device storage room MR, while the pressure reducer 53 and the cooling heat exchanger 16 are in the vehicle compartment. It is arranged. Therefore, the high pressure refrigerant pipe 54 and the low pressure refrigerant pipe 55 are drawn into the vehicle compartment from the device accommodation room MR via the second pipe lead-in hole H2 provided in the dash panel DP.

  In the temperature control case portion 12B, a heating heat exchanger 18 for heating the air that has passed through the cooling heat exchanger 16 is disposed downstream of the cooling heat exchanger 16 with respect to the air flow. The heat exchanger 18 for heating of the present embodiment exchanges heat between the cooling water for cooling the engine EG, which is a heat medium, and the air flowing inside the temperature control case portion 12B of the air conditioning case 12 to thereby heat the inside of the air conditioning case 12. It is a heat exchanger that heats the flowing air. Although not shown, the heating heat exchanger 18 is disposed so as to straddle the upper layer passage 121 and the lower layer passage 122 so as to be able to heat both the air flowing through the upper layer passage 121 and the air flowing through the lower layer passage 122.

  In the heating heat exchanger 18, high temperature water piping 19 through which high temperature cooling water heated by the engine EG flows, and low temperature cooling water having passed through the heating heat exchanger 18 are returned to the engine EG side. Low temperature water piping 20 is connected. The high temperature water piping 19 and the low temperature water piping 20 are drawn into the vehicle compartment from the device storage room MR via a first piping lead-in hole H1 provided in the dash panel DP.

  Although not shown, a bypass passage is formed in the temperature control case portion 12B for bypassing the heating heat exchanger 18 and allowing air to flow, and the air flow of the air passing through the heating heat exchanger 18 and the bypass passage An air mix door is arranged to adjust the ratio of the air volume to the volume of air.

  Furthermore, a wind distribution unit portion is connected to the temperature control case portion 12B on the air flow downstream side of the heating heat exchanger 18 and the bypass passage.

  Although not shown, the air distribution unit portion includes a defroster blowout portion that blows air toward the front glass of the vehicle C, a face blowout portion that blows air toward the upper body of the occupant, and a foot that blows air toward the lower body of the occupant It has a blowout part. Further, the air distribution unit portion is provided with a mode switching mechanism for changing the blowing mode of the air into the vehicle compartment.

  Here, in the vehicle air conditioning unit 1 of the present embodiment, the connection portion between the blower unit portion 10A and the temperature control unit portion 10B overlaps the second pipe lead-in hole H2 in the longitudinal direction DRfr of the vehicle.

  In such a structure, the high-pressure refrigerant pipe 54 and the low-pressure refrigerant pipe 55 may be bent in accordance with the outer shape of the air-conditioning case 12 in order to avoid interference between the high-pressure refrigerant pipe 54 and the low-pressure refrigerant pipe 55 and the air conditioning case 12 .

  However, when the high pressure refrigerant piping 54 and the low pressure refrigerant piping 55 are bent in accordance with the outer shape of the air conditioning case 12, the pressure loss in the refrigeration cycle apparatus 50 may increase or the physical size of the vehicle air conditioning unit 1 may increase. .

  Therefore, the vehicle air conditioning unit 1 of the present embodiment has a structure in which the high pressure refrigerant piping 54 and the low pressure refrigerant piping 55 connected to the cooling heat exchanger 16 with respect to the air conditioning case 12 penetrate.

  As shown in FIG. 2, the vehicle air conditioning unit 1 of the present embodiment is a single unit for causing the high pressure refrigerant pipe 54 and the low pressure refrigerant pipe 55 to penetrate through the partition wall 13 set inside the air conditioning case 12. Through holes 130 are formed. The through holes 130 extend in a direction (in this example, the front-rear direction DRfr) substantially perpendicular to the air flow flowing through the upper layer passage 121 and the lower layer passage 122.

  Specifically, the partition wall portion 13 includes a first bulging wall portion 131 bulging toward the upper layer passage 121 and a bulging portion toward the lower layer passage 122 at a portion between the blower 14 and the cooling heat exchanger 16. A second bulging wall 132 is provided. Then, a through hole 130 for penetrating the high pressure refrigerant pipe 54 and the low pressure refrigerant pipe 55 is formed by the gap between the first expanded wall portion 131 and the second expanded wall portion 132. The through hole 130 has a dimension in the vertical direction DRud so that the high pressure refrigerant pipe 54 and the low pressure refrigerant pipe 55 can be arranged side by side along the alignment direction of the upper layer passage 121 and the lower layer passage 122.

  The first bulging wall portion 131 and the second bulging wall portion 132 of the present embodiment have a vertically symmetrical shape so as to project substantially equally to both the upper layer passage 121 and the lower layer passage 122. There is. Specifically, the first bulging wall portion 131 and the second bulging wall portion 132 of the present embodiment each have a shape bent in an L shape so that a rhombic through hole 130 is formed. ing.

  The high-pressure refrigerant pipe 54 and the low-pressure refrigerant pipe 55 are inserted in a bundled state with respect to a single through hole 130 formed for the partition 13. The high pressure refrigerant piping 54 and the low pressure refrigerant piping 55 of the present embodiment are arranged in the through hole 130 so as to be aligned in the alignment direction of the upper layer passage 121 and the lower layer passage 122 (that is, the up and down direction DRud). In other words, the high pressure refrigerant piping 54 and the low pressure refrigerant piping 55 of the present embodiment are inserted through the through hole 130 in a state of being bundled so as to overlap each other in the vertical direction DRud.

  Specifically, the low pressure refrigerant pipe 55 of the present embodiment is disposed closer to the upper layer passage 121 than the high pressure refrigerant pipe 54 in the through hole 130. In other words, the low pressure refrigerant pipe 55 is disposed above the high pressure refrigerant pipe 54 in the through hole 130 so as to be closer to the first expanded wall 131 than the second expanded wall 132. .

  On the other hand, the high pressure refrigerant pipe 54 of the present embodiment is disposed closer to the lower layer passage 122 than the low pressure refrigerant pipe 55 in the through hole 130. In other words, the high pressure refrigerant pipe 54 is disposed below the low pressure refrigerant pipe 55 in the through hole 130 so as to be closer to the second expanded wall 132 than the first expanded wall 131. .

  Next, the operation of the vehicle air conditioning unit 1 of the present embodiment will be described. In the vehicle air conditioning unit 1 of the present embodiment, the air suction mode is set to an outside air mode for introducing only outside air, an inside air mode for introducing only inside air, and an inside / outside air double layer mode for separately introducing inside air and outside air. It is configured to be possible. The control process of various devices including the switching control of the suction mode is executed by a control device (not shown). The controller comprises a known microcomputer including a processor and a memory and its peripheral circuits.

  First, in the outside air mode, as shown in FIG. 4, the control device sets the first inside / outside air switching door 128 at a position where the outside air introduction port 124 is opened and the first inside air introduction port 125 is closed. Further, in the outside air mode, the control device sets the second inside / outside air switching door 129 at a position where the communication passage 127 is opened and the second inside air introduction port 126 is closed.

  In this state, when the blower 14 is driven by the control device, the outside air introduced from the outside air introduction port 124 is introduced into the upper layer passage 121. At this time, since the communication passage 127 is opened, a part of the outside air introduced from the outside air introduction port 124 is also introduced into the lower layer passage 122.

  The air introduced into the upper layer passage 121 and the lower layer passage 122 flows into the cooling heat exchanger 16 via the fans 141 and 142 of the blower 14 and is cooled to a predetermined temperature. The air having passed through the cooling heat exchanger 16 is adjusted to a desired temperature by being mixed after passing through at least one of the heating heat exchanger 18 and the bypass passage. The temperature-controlled air is blown out as a conditioned air to a desired location in the vehicle compartment via the air distribution unit. In the outside air mode, it is possible to ventilate the interior of the vehicle by introducing fresh air outside the vehicle or to suppress window fogging by introducing dry air outside the vehicle.

  Subsequently, in the inside air mode, as shown in FIG. 5, the control device sets the first inside / outside air switching door 128 to a position where the first inside air introduction port 125 is opened and the outside air introduction port 124 is closed. . Further, in the inside air mode, the second inside / outside air switching door 129 is set to a position where the second inside air introduction port 126 is opened and the communication passage 127 is closed by the control device.

  In this state, when the blower 14 is driven by the control device, the inside air introduced from the first inside air introduction port 125 is introduced into the upper layer passage 121 and the inside air introduced from the second inside air introduction port 126 is the lower layer passage. It is introduced at 122.

  The air introduced into the upper layer passage 121 and the lower layer passage 122 flows into the cooling heat exchanger 16 via the fans 141 and 142 of the blower 14 and is cooled to a predetermined temperature. The air having passed through the cooling heat exchanger 16 is adjusted to a desired temperature by being mixed after passing through at least one of the heating heat exchanger 18 and the bypass passage. The temperature-controlled air is blown out as a conditioned air to a desired location in the vehicle compartment via the air distribution unit. In the inside air mode, the air conditioning efficiency can be improved by circulating the air in the vehicle compartment.

  Subsequently, at the position where the first inside / outside air switching door 128 opens the outside air introduction port 124 and the first inside air introduction port 125 is closed by the control device as shown in FIG. It is set. Further, in the inside / outside air double layer mode, the second inside / outside air switching door 129 is set to a position where the second inside air introduction port 126 is opened and the communication passage 127 is closed by the control device.

  In this state, when the blower 14 is driven by the control device, the outside air introduced from the outside air introduction port 124 is introduced into the upper layer passage 121 and the inside air introduced from the second inside air introduction port 126 is supplied to the lower layer passage 122 be introduced.

  The outside air introduced into the upper layer passage 121 and the inside air introduced into the lower layer passage 122 are blown toward the cooling heat exchanger 16 by the fans 141 and 142 of the blower 14. Under the present circumstances, the external air which flows along the partition part 13 in the upper layer channel | path 121 becomes a flow of diagonally upward with the 1st bulging wall part 131 which comprises the through-hole 130. As shown in FIG. On the other hand, the inside air flowing along the partition wall 13 in the lower layer passage 122 has a diagonally downward flow by the second bulging wall portion 132 constituting the through hole 130.

  Thus, the flow of air along the partition wall 13 is suppressed in the vicinity of the cooling heat exchanger 16 in the partition wall 13. Therefore, the outside air and the inside air through the gap G between the cooling heat exchanger 16 and the partition wall 13 You can suppress the mixing with. That is, the vehicle air conditioning unit 1 of the present embodiment has a structure capable of sufficiently securing the inside / outside air separability.

  Outside air flowing in the upper layer passage 121 flows into the cooling heat exchanger 16 and is cooled to a predetermined temperature, passes through at least one of the heating heat exchanger 18 and the bypass passage, and then passes through the defroster blowout portion of the wind distribution unit. It blows out near the windshield of the vehicle interior. Thereby, the window fogging of the windshield is suppressed.

  On the other hand, the inside air flowing through the lower layer passage 122 flows into the cooling heat exchanger 16, is cooled to a predetermined temperature, and passes through at least one of the heating heat exchanger 18 and the bypass passage, It is blown out toward the passenger in the vehicle compartment via Thus, a comfortable air-conditioning feeling can be provided to the occupant.

  The vehicle air conditioning unit 1 of the present embodiment described above is configured to be able to set the inside / outside air two-layer mode. For this reason, the vehicle air conditioning unit 1 of the present embodiment can suppress window fogging while suppressing the ventilation loss.

  Here, FIG. 6 is a schematic view showing a vehicle air conditioning unit CE which is a comparative example of the vehicle air conditioning unit 1 of the present embodiment. In the vehicle air conditioning unit CE shown in FIG. 6, a through hole TH for allowing the high pressure refrigerant piping 54 and the low pressure refrigerant piping 55 to pass through is formed in a portion of the air conditioning case 12 forming the upper layer passage 121 in this embodiment. This is different from the vehicle air conditioning unit CE of In FIG. 6, the same components as the vehicle air conditioning unit 1 of the present embodiment in the vehicle air conditioning unit CE of the comparative example are given the same reference numerals as the vehicle air conditioning unit 1 of the present embodiment. .

  As shown in FIG. 6, in the air conditioning unit CE of the comparative example, a through hole TH for allowing the high pressure refrigerant piping 54 and the low pressure refrigerant piping 55 to penetrate is provided in a portion of the air conditioning case 12 forming the upper layer passage 121. There is. The high pressure refrigerant pipe 54 and the low pressure refrigerant pipe 55 are disposed to penetrate the upper layer passage 121. The other configuration of the vehicle air conditioning unit CE of the comparative example is configured in the same manner as the vehicle air conditioning unit 1 of the present embodiment.

  Subsequently, the flow of air in the internal / external air double layer mode in the vehicle air conditioning unit CE of the comparative example will be described. In the inside / outside air double layer mode, the control device sets the first inside / outside air switching door 128 to a position where the outside air introduction port 124 is opened, and the second inside / outside air switching door 129 opens the second inside air introduction port 126 Set to position.

  In this state, when the blower 14 is driven by the control device, the outside air introduced from the outside air introduction port 124 is introduced into the upper layer passage 121 and the inside air introduced from the second inside air introduction port 126 is supplied to the lower layer passage 122 be introduced.

  The outside air introduced into the upper layer passage 121 and the inside air introduced into the lower layer passage 122 are blown toward the cooling heat exchanger 16 by the fans 141 and 142 of the blower 14. Under the present circumstances, since piping etc. are not arrange | positioned, the internal air which flows through the lower layer channel | path 122 flows into the heat exchanger 16 for cooling as it is, without being divided by bifurcating. On the other hand, the outside air flowing through the upper layer passage 121 collides with the refrigerant pipes 54 and 55 and is divided into upper and lower parts, and then flows into the cooling heat exchanger 16. That is, in the upper layer passage 121, the ventilation resistance increases due to the change in the passage shape and the branching loss caused by the penetration of the refrigerant pipes 54 and 55.

  As described above, in the vehicle air conditioning unit CE of the comparative example, an increase in ventilation resistance is biased to the upper layer passage 121 among the upper layer passage 121 and the lower layer passage 122. For this reason, in the vehicle air conditioning unit CE of the comparative example, it becomes difficult to set the air volume ratio of the upper layer passage 121 and the lower layer passage 122 to a ratio suitable for coexistence of the air conditioning performance and the antifogging performance. This similarly occurs in the configuration in which the refrigerant pipes 54 and 55 are disposed with respect to the portion of the air conditioning case 12 which forms the lower layer passage 122.

  On the other hand, in the vehicle air conditioning unit 1 of the present embodiment, the through holes 130 through which the high pressure refrigerant piping 54 and the low pressure refrigerant piping 55 are penetrated are formed in the partition portion 13. For this reason, in the vehicle air conditioning unit 1 of the present embodiment, one of the upper layer passage 121 and the lower layer passage 122 does not branch up and down by the angular refrigerant pipes 54 and 55 or the like.

  For this reason, according to the vehicle air conditioning unit 1 of the present embodiment, an increase in ventilation resistance caused by penetrating the refrigerant pipes 54, 55 is higher than the upper layer passage 121 and the lower layer, as compared with the vehicle air conditioning unit CE of the comparative example. It is possible to prevent the one of the passages 122 from being biased. Therefore, according to the vehicle air conditioning unit 1 of the present embodiment, the air volume ratio of the upper layer passage 121 and the lower layer passage 122 caused by causing the air conditioning case 12 to penetrate the refrigerant pipes 54 and 55 in the internal / external air double layer mode Change can be suppressed.

  In the vehicle air conditioning unit 1 of the present embodiment, the low pressure refrigerant pipe 55 is disposed closer to the upper layer passage 121 than the high pressure refrigerant pipe 54 in the through hole 130, and the high pressure refrigerant pipe 54 is a low pressure refrigerant pipe in the through hole 130. It is disposed closer to the lower layer passage 122 than 55.

  As described above, when the low pressure refrigerant pipe 55 having a temperature lower than that of the high pressure refrigerant pipe 54 is disposed on the upper layer passage 121 side, the inside air flowing through the lower layer passage 122 and the low pressure refrigerant pipe 55 are Heat loss due to heat exchange is suppressed. As a result, it is possible to improve the heating efficiency of the vehicle air conditioning unit 1 by introducing the inside air.

Second Embodiment
Next, a second embodiment will be described with reference to FIG. In the present embodiment, the arrangement configuration and the like of the high pressure refrigerant pipe 54 and the low pressure refrigerant pipe 55 in the partition wall 13 are different from those in the first embodiment.

  As shown in FIG. 7, in the vehicle air conditioning unit 1 of the present embodiment, the shape of the through hole 130 formed in the partition 13 is different from that of the first embodiment.

  The through hole 130 of the present embodiment is shaped such that the high pressure refrigerant pipe 54 and the low pressure refrigerant pipe 55 can be arranged side by side along the air flow direction in the upper layer passage 121 and the lower layer passage 122. That is, in the through hole 130 of the present embodiment, the dimension in the air flow direction in the upper layer passage 121 and the lower layer passage 122 is larger than the dimension in the alignment direction of the upper layer passage 121 and the lower layer passage 122.

  Specifically, in the through hole 130 of the present embodiment, the dimension in the air flow direction in the upper layer passage 121 and the lower layer passage 122 is larger than the total value of the pipe diameter of the high pressure refrigerant pipe 54 and the pipe diameter of the low pressure refrigerant pipe 55 ing. Further, in the through hole 130 of the present embodiment, the dimension in the alignment direction of the upper layer passage 121 and the lower layer passage 122 is smaller than the sum of the pipe diameter of the high pressure refrigerant pipe 54 and the pipe diameter of the low pressure refrigerant pipe 55.

  Further, the dimensions of the first bulging wall portion 131A and the second bulging wall portion 132A of the present embodiment in the direction of projecting toward the upper layer passage 121 and the lower layer passage 122 are shorter than those in the first embodiment. Specifically, the first bulging wall portion 131A and the second bulging wall portion 132A of the present embodiment each have a bent shape so that a hexagonal through hole 130 is formed. The first bulging wall portion 131A and the second bulging wall portion 132A of the present embodiment have a vertically symmetrical shape so as to project substantially equally to both the upper layer passage 121 and the lower layer passage 122. doing.

  Further, the high-pressure refrigerant pipe 54 and the low-pressure refrigerant pipe 55 of the present embodiment are arranged in the through hole 130 along the flow direction of the air flowing through the upper layer passage 121 and the lower layer passage 122. In other words, the high-pressure refrigerant pipe 54 and the low-pressure refrigerant pipe 55 of this embodiment are inserted into the through hole 130 in a state of being bundled so as to overlap each other in the flow direction of the air flowing through the upper layer passage 121 and the lower layer passage 122 There is.

  Specifically, the low pressure refrigerant pipe 55 of the present embodiment is disposed in the through hole 130 at a position upstream of the upper layer passage 121 and the lower layer passage 122 with respect to the air flow of the high pressure refrigerant pipe 54. In other words, the low pressure refrigerant pipe 55 is disposed at a position closer to the blower 14 than the high pressure refrigerant pipe 54 in the through hole 130.

  On the other hand, the high pressure refrigerant pipe 54 of the present embodiment is disposed at the downstream side of the through holes 130 on the air flow downstream side of the upper layer passage 121 and the lower layer passage 122 than the low pressure refrigerant pipe 55. In other words, the high pressure refrigerant pipe 54 is disposed at a position closer to the cooling heat exchanger 16 than the low pressure refrigerant pipe 55 in the through hole 130.

  The other configuration is the same as that of the first embodiment. The vehicle air conditioning unit 1 of the present embodiment can obtain the same advantages as the first embodiment, with the same advantages as those of the first embodiment.

  In particular, in the vehicle air conditioning unit 1 of the present embodiment, the high pressure refrigerant pipe 54 and the low pressure refrigerant pipe 55 are arranged in the air flow direction inside the air conditioning case 12. According to this, as compared with the arrangement configuration in which the high pressure refrigerant piping 54 and the low pressure refrigerant piping 55 are arranged in a direction intersecting the air flow direction inside the air conditioning case 12, the abrupt change of the passage shape in the upper layer passage 121 and the lower layer passage 122 Is suppressed. Therefore, the ventilation resistance of the upper layer passage 121 and the lower layer passage 122 resulting from the penetration of the high pressure refrigerant pipe 54 and the low pressure refrigerant pipe 55 with respect to the air conditioning case 12 can be sufficiently suppressed.

Third Embodiment
Next, a third embodiment will be described with reference to FIG. In the present embodiment, the arrangement configuration and the like of the high pressure refrigerant pipe 54 and the low pressure refrigerant pipe 55 in the partition wall 13 are different from those in the first embodiment.

  As shown in FIG. 8, in the vehicle air conditioning unit 1 of the present embodiment, the high pressure refrigerant piping 54 and the low pressure refrigerant piping 55 are arranged in the through hole 130 in the alignment direction of the upper layer passage 121 and the lower layer passage 122 It is arranged to line up with DRud).

  Specifically, the high pressure refrigerant pipe 54 of the present embodiment is disposed closer to the upper layer passage 121 than the low pressure refrigerant pipe 55 in the through hole 130. In other words, the high pressure refrigerant pipe 54 is disposed above the low pressure refrigerant pipe 55 in the through hole 130 so as to be closer to the first expanded wall 131 than the second expanded wall 132. .

  On the other hand, the low pressure refrigerant pipe 55 of the present embodiment is disposed closer to the lower layer passage 122 than the high pressure refrigerant pipe 54 in the through hole 130. In other words, the low pressure refrigerant pipe 55 is disposed below the high pressure refrigerant pipe 54 in the through hole 130 so as to be closer to the second expanded wall 132 than the first expanded wall 131. .

  The other configuration is the same as that of the first embodiment. The vehicle air conditioning unit 1 of the present embodiment can obtain the same advantages as the first embodiment, with the same advantages as those of the first embodiment.

  In particular, in the vehicle air conditioning unit 1 of the present embodiment, the high pressure refrigerant pipe 54 is disposed closer to the upper layer passage 121 than the low pressure refrigerant pipe 55 in the through hole 130, and the low pressure refrigerant pipe 55 is a high pressure refrigerant pipe in the through hole 130. It is disposed closer to the lower layer passage 122 than 54.

  As described above, when the high pressure refrigerant pipe 54 having a temperature higher than that of the low pressure refrigerant pipe 55 is disposed on the upper layer passage 121 side, the high pressure refrigerant pipe 54 flows when the outside air flowing through the upper layer passage 121 flows around the through hole 130. Receive heat from and heat up. That is, according to the configuration of the present embodiment, the high pressure refrigerant pipe 54 can be used as an auxiliary heat source for raising the temperature of the outside air flowing through the upper layer passage 121 in the inside / outside air double layer mode. As a result, the heating efficiency of the vehicle air conditioning unit 1 can be improved.

  Further, when the temperature of the outside air flowing through the upper layer passage 121 is increased by the heat received from the high pressure refrigerant pipe 54, the relative humidity of the outside air is reduced. For this reason, the improvement of the antifogging performance in the vehicle air conditioning unit 1 can also be expected.

Fourth Embodiment
Next, a fourth embodiment will be described with reference to FIG. In the present embodiment, the arrangement configuration and the like of the high pressure refrigerant pipe 54 and the low pressure refrigerant pipe 55 in the partition wall 13 are different from those in the second embodiment.

  As shown in FIG. 9, the high pressure refrigerant pipe 54 of the present embodiment is disposed at a position on the upstream side of the upper layer passage 121 and the lower layer passage 122 of the through hole 130 on the air flow upstream side of the low pressure refrigerant pipe 55. In other words, the high pressure refrigerant pipe 54 is disposed at a position closer to the blower 14 than the low pressure refrigerant pipe 55 in the through hole 130.

  On the other hand, the low pressure refrigerant pipe 55 of the present embodiment is disposed in the through hole 130 at a position on the air flow downstream side of the upper layer passage 121 and the lower layer passage 122 than the high pressure refrigerant pipe 54. In other words, the low pressure refrigerant pipe 55 is disposed at a position closer to the cooling heat exchanger 16 than the high pressure refrigerant pipe 54 in the through hole 130.

  The other configuration is the same as that of the second embodiment. The vehicle air conditioning unit 1 of the present embodiment can obtain the same advantages as the second embodiment, with the same advantages as those of the second embodiment.

  In particular, in the vehicle air conditioning unit 1 of the present embodiment, the high pressure refrigerant pipe 54 is disposed upstream of the low pressure refrigerant pipe 55 in the through hole 130 in the air flow direction of the air conditioning case 12. According to this, when the outside air flowing through the upper layer passage 121 and the inside air flowing through the lower layer passage 122 flow near the through hole 130, the heat is received from the high pressure refrigerant pipe 54 and the temperature is raised. That is, according to the configuration of the present embodiment, the high-pressure refrigerant pipe 54 can be used as an auxiliary heat source for raising the temperature of the outside air flowing through the upper layer passage 121 and the inside air flowing through the lower layer passage 122 in the inside / outside air double layer mode. As a result, the heating efficiency of the vehicle air conditioning unit 1 can be improved.

  Here, the air flowing along the partition 13 in the upper layer passage 121 is directed obliquely upward by the air flow upstream side of the first bulging wall 131 that constitutes the through hole 130. Further, the air flowing along the partition wall 13 in the lower layer passage 122 is directed obliquely downward by the air flow upstream side of the second bulging wall portion 132 constituting the through hole 130.

  As a result, the outside air flowing through the upper layer passage 121 and the inside air flowing through the lower layer passage 122 are less likely to flow along the downstream portion of the air flow of the bulging wall portions 131 and 132. Heat exchange is suppressed.

Fifth Embodiment
Next, a fifth embodiment will be described with reference to FIG. 10 and FIG. The present embodiment is different from the first embodiment in that the vehicle air conditioning unit 1 is applied to a vehicle C in which the steering wheel Hd is disposed on the left side in the vehicle width direction DRw.

  As shown in FIG. 10, in the vehicle air conditioning unit 1 of the present embodiment, the temperature control unit 10B is disposed substantially at the center in the vehicle width direction DRw, and the blower unit 10A is offset to the right in the vehicle width direction DRw. Is configured. In the vehicle air conditioning unit 1 of the present embodiment, the blower unit 10A is offset to the right in the vehicle width direction DRw, so that the connection portion between the blower unit 10A and the temperature control unit 10B is in the vehicle width direction DRw. It is configured to extend along.

  Further, in the vehicle air conditioning unit 1 of the present embodiment, the connection portion between the blower unit portion 10A and the temperature control unit portion 10B overlaps the first pipe lead-in hole H1 in the longitudinal direction DRfr of the vehicle.

  In such a structure, in order to avoid the interference between the high temperature water piping 19 and the low temperature water piping 20 connected to the heat exchanger 18 for heating and the air conditioning case 12, the high temperature water piping 19 and the low temperature water piping 20 are air conditioning case 12 It may be bent according to the outer shape of.

  However, when the high temperature water piping 19 and the low temperature water piping 20 are bent according to the outer shape of the air conditioning case 12, the pressure loss in the cooling water circuit of the engine EG increases or the physical size of the vehicle air conditioning unit 1 increases. It will

  Therefore, the vehicle air conditioning unit 1 of the present embodiment has a structure in which the high temperature water piping 19 and the low temperature water piping 20 connected to the heating heat exchanger 18 pass through the air conditioning case 12. In the vehicle air conditioning unit 1 of the present embodiment, the connection between the blower unit 10A and the temperature control unit 10B does not overlap the second pipe lead-in hole H2 in the longitudinal direction DRfr of the vehicle. Therefore, in the vehicle air conditioning unit 1 of the present embodiment, the high pressure refrigerant piping 54 and the low pressure refrigerant piping 55 do not penetrate the air conditioning case 12.

  As shown in FIG. 11, the vehicle air conditioning unit 1 of the present embodiment is a single unit for causing the high temperature water piping 19 and the low temperature water piping 20 to penetrate through the partition wall 13 set inside the air conditioning case 12. Through holes 130 are formed. The through holes 130 extend in a direction (in this example, the front-rear direction DRfr) substantially perpendicular to the air flow flowing through the upper layer passage 121 and the lower layer passage 122.

  Specifically, the partition wall portion 13 includes a first bulging wall portion 131 bulging toward the upper layer passage 121 and a bulging portion toward the lower layer passage 122 at a portion between the blower 14 and the cooling heat exchanger 16. A second bulging wall 132 is provided. And by the crevice between the 1st bulging wall part 131 and the 2nd bulging wall part 132, the penetration hole 130 for making the high temperature water piping 19 and the low temperature water piping 20 penetrate is formed. In addition, since the 1st bulging wall part 131 and the 2nd bulging wall part 132 of this embodiment are comprised similarly to 1st Embodiment, the description is abbreviate | omitted.

  The high temperature water piping 19 and the low temperature water piping 20 are inserted in a bundled state with respect to a single through hole 130 formed to the partition 13. The high temperature water piping 19 and the low temperature water piping 20 of the present embodiment are arranged in the through hole 130 so as to be aligned in the alignment direction of the upper layer passage 121 and the lower layer passage 122 (that is, the vertical direction DRud).

  Specifically, the low temperature water pipe 20 of the present embodiment is disposed in the through hole 130 on the upper layer passage 121 side of the high temperature water pipe 19. In other words, the low temperature water pipe 20 is disposed above the high temperature water pipe 19 in the through hole 130 so as to be closer to the first expanded wall portion 131 than the second expanded wall portion 132. .

  On the other hand, the high temperature water pipe 19 of the present embodiment is disposed closer to the lower layer passage 122 than the low temperature water pipe 20 in the through hole 130. In other words, the high temperature water pipe 19 is disposed below the low temperature water pipe 20 in the through hole 130 so as to be closer to the second expanded wall portion 132 than the first expanded wall portion 131. .

  The other configuration is the same as that of the first embodiment. The vehicle air conditioning unit 1 of the present embodiment can obtain the same advantages as the first embodiment, with the same advantages as those of the first embodiment. That is, in the vehicle air conditioning unit 1 of the present embodiment, the increase in the ventilation resistance accompanying the penetration of the hot water pipes 19 and 20 into the air conditioning case 12 is prevented from being biased to one of the upper layer passage 121 and the lower layer passage 122 can do. Therefore, according to the vehicle air conditioning unit 1 of the present embodiment, the air volume ratio of the upper layer passage 121 and the lower layer passage 122 caused by causing the hot water pipes 19 and 20 to penetrate the air conditioning case 12 in the inside / outside air double layer mode. Change can be suppressed.

  Here, in the present embodiment, the cooling water of the engine EG is supplied to the heating heat exchanger 18 via the high temperature water piping 19, and the cooling water is discharged from the heating heat exchanger 18 via the low temperature water piping 20. Ru. For this reason, in the present embodiment, the high temperature water pipe 19 constitutes a heat medium supply pipe for supplying the cooling water as a heat medium to the heating heat exchanger 18, and the low temperature water pipe 20 serves as a heat exchange for heating. The heat medium discharge pipe for discharging the cooling water which is a heat medium from the vessel 18 is configured. Further, in the present embodiment, the high temperature water pipe 19 constitutes a high temperature pipe, and the low temperature water pipe 20 constitutes a low temperature pipe.

(Modification of the fifth embodiment)
In the fifth embodiment described above, the low temperature water pipe 20 is disposed on the upper layer passage 121 side of the through holes 130, and the high temperature water pipe 19 is disposed on the lower layer passage 122 side of the through holes 130. It is not limited to.

  In the vehicle air conditioning unit 1, for example, the high temperature water piping 19 is disposed on the upper layer passage 121 side of the through holes 130, and the low temperature water piping 20 is disposed on the lower layer passage 122 side of the through holes 130. It is also good. Also, for example, one of the high-temperature water piping 19 and the low-temperature water piping 20 is disposed on the upstream side of the air flow inside the air conditioning case 12 relative to the other piping. It may be

(Other embodiments)
Although the representative embodiments of the present disclosure have been described above, the present invention is not limited to the above-described embodiments, and can be variously modified as follows, for example.

  Although the above-mentioned each embodiment explained the composition which makes it penetrate in the state where each refrigerant piping 54, 55 grade, etc. were bundled to a single penetration hole 130, it is not limited to this. For example, the vehicle air conditioning unit 1 may have a configuration in which two through holes are formed in the partition 13 and the refrigerant pipes 54 and 55 are individually inserted into the respective through holes.

  Although the above-mentioned each embodiment demonstrated the example which forms the through-hole 130 by the 1st bulging wall part 131 and the 2nd bulging wall part 132 which become symmetrical vertically, it is not limited to this. For example, the through hole 130 may be formed by the first bulging wall portion 131 and the second bulging wall portion 132 which are vertically asymmetric. For example, the through hole 130 may be formed by a bulging wall portion bulging toward one of the upper layer passage 121 and the lower layer passage 122 and a flat wall portion.

  Although the above-mentioned each embodiment explained the example which applies air-conditioning unit 1 for vehicles of this indication to vehicles C in which two piping lead-in holes H1 and H2 are formed to dash panel DP, It is not limited to. The vehicle air conditioning unit 1 of the present disclosure is also applicable to, for example, a vehicle C in which a single pipe lead-in hole is formed in the dash panel DP. In this case, the refrigerant pipes 54 and 55 and the hot water pipes 19 and 20 are inserted in a bundle in a single pipe lead-in hole.

  Although the above-mentioned each embodiment demonstrated the structure by which the air blower 14 is arrange | positioned upstream of the air flow of the heat exchanger 16 for cooling, it is not limited to this. The vehicle air conditioning unit 1 has, for example, a configuration in which the blower 14 is disposed between the cooling heat exchanger 16 and the heating heat exchanger 18, or is disposed downstream of the heating heat exchanger 18 in the air flow direction. The configuration may be

  Although the above-mentioned each embodiment demonstrated the example which employ | adopts the evaporator which comprises the refrigerating-cycle apparatus 50 as the heat exchanger 16 for cooling, it is not limited to this. The cooling heat exchanger 16 may be, for example, a heat exchanger into which the fluid cooled by the evaporator of the refrigeration cycle apparatus 50 is introduced.

  Although the above-mentioned each embodiment demonstrated the example which employ | adopts the heat exchanger which thermally radiates the cooling water of engine EG as heat exchanger 18 for a heating, it is not limited to this. The heat exchanger 16 for cooling may be comprised, for example with the heat exchanger which thermally radiates the cooling water of apparatuses (for example, high voltage battery) other than engine EG.

  Although the above-mentioned each embodiment illustrated the composition by which ventilation unit part 10A is offset arranged by the side of temperature control unit part 10B as air-conditioning unit 1 for vehicles, it is not limited to this. The vehicle air conditioning unit 1 may have a layout with a center, in which both the blower unit 10A and the temperature control unit 10B are disposed substantially in the center in the vehicle width direction DRw.

  It is needless to say that the elements constituting the embodiment in the above-described embodiment are not necessarily essential except when clearly shown as being essential and when it is considered to be obviously essential in principle.

  In the above embodiment, when numerical values such as the number, numerical value, amount, range and the like of the constituent elements of the embodiment are mentioned, it is clearly indicated that they are particularly essential and clearly limited to a specific number in principle. It is not limited to that particular number except in cases such as, etc.

  In the above embodiment, when referring to the shape, positional relationship, etc. of the component etc., unless otherwise specified or in principle when limited to a specific shape, positional relationship, etc., the shape, positional relationship, etc. It is not limited to etc.

(Summary)
According to a first aspect of the present invention described in part or all of the above-described embodiments, a vehicle air conditioning unit includes an air conditioning case, a heat exchanger disposed inside the air conditioning case, and a heat exchanger. A heat medium supply pipe for supplying a heat medium and a heat medium discharge pipe for discharging the heat medium from the heat exchanger are provided. Inside the air conditioning case, there are provided a partition for forming an outside air passage for flowing outside air in the inside / outside air double layer mode and an inside air passage for flowing inside air in the inside / outside air double layer mode. Further, through holes are formed in the partition wall for passing through the heat medium supply pipe and the heat medium discharge pipe.

  According to the second aspect, the heat medium supply pipe and the heat medium discharge pipe of the vehicle air conditioning unit constitute a high temperature pipe in which a heat medium having a temperature higher than that of the heat medium flowing through the other pipe flows Tubes constitute low temperature piping. The low temperature piping is disposed on the outside air passage side of the through holes in comparison with the high temperature piping. And high temperature piping is arranged in the inside air passage side compared with low temperature piping among the penetration holes.

  As described above, when the low temperature piping is disposed on the outside air passage side, the heat loss due to the heat exchange between the low temperature piping and the inside air flowing through the inside air passage in the inside / outside air double layer mode is suppressed. The heating efficiency of the air conditioning unit can be improved.

  According to the third aspect, the heat medium supply pipe and the heat medium discharge pipe of the air conditioning unit for a vehicle are arranged in the through hole along the air flow direction of the air flowing inside the air conditioning case. It is arrange | positioned in the position which becomes the air flow upstream inside the air-conditioning case rather than the pipe | tube.

  According to this, as compared with the arrangement configuration in which the heat medium supply pipe and the heat medium discharge pipe are arranged in the direction intersecting the air flow direction, the rapid change of the passage shape in the inside air passage and the outside air passage is suppressed. Therefore, it is possible to sufficiently suppress the ventilation resistance of the outside air passage and the inside air passage resulting from the heat medium supply pipe and the heat medium discharge pipe penetrating the air conditioning case.

  According to the fourth aspect, the heat medium supply pipe and the heat medium discharge pipe of the vehicle air conditioning unit constitute a high temperature pipe in which a heat medium having a temperature higher than that of the heat medium flowing through the other pipe flows Tubes constitute low temperature piping.

  As described above, if the high temperature piping is disposed on the upstream side of the air flow, the high temperature piping can be used as an auxiliary heat source at the time of heating the vehicle interior, so that the heating efficiency in the vehicle air conditioning unit can be improved. it can.

  According to the fifth aspect, the heat medium supply pipe and the heat medium discharge pipe of the vehicle air conditioning unit constitute a high temperature pipe in which a heat medium having a temperature higher than that of the heat medium flowing through the other pipe flows Tubes constitute low temperature piping. The low temperature piping is disposed on the inside air passage side of the through holes in comparison with the high temperature piping. And high temperature piping is arranged at the open air passage side compared with low temperature piping among the penetration holes.

  As described above, if the high temperature piping is disposed on the outside air passage side, the high temperature piping can be used as an auxiliary heat source for raising the temperature of the outside air in the internal / external air double layer mode, so the heating efficiency in the vehicle air conditioning unit is improved. Can be

  According to the sixth aspect, the heat medium supply pipe and the heat medium discharge pipe of the air conditioning unit for a vehicle are inserted into a single through hole in a state of being bundled so as to be adjacent to each other. According to this, since it is only necessary to provide a single through hole inside the air conditioning case, the structure for allowing the heat medium supply pipe and the heat medium discharge pipe to penetrate the air conditioning case can be simplified.

  According to the seventh aspect, the heat exchanger of the vehicle air conditioning unit exchanges heat between the heat medium and the air flowing inside the air conditioning case to cool the air flowing inside the air conditioning case as a cooling heat exchanger. It is configured. When it is necessary to penetrate the heat medium supply pipe and the heat medium discharge pipe connected to the heat exchanger for cooling to the air conditioning case, by arranging each pipe in the through hole of the partition, the internal / external air double layer mode It is possible to suppress changes in the air volume ratio of the outside air passage and the inside air passage at the time.

  According to the eighth aspect, the heat exchanger of the vehicle air conditioning unit heats the air flowing inside the air conditioning case by heat exchange between the heat medium and the air flowing inside the air conditioning case, thereby heating the air flowing inside the air conditioning case. It is configured. When it is necessary to penetrate the heat medium supply pipe and the heat medium discharge pipe connected to the heat exchanger for heating with respect to the air conditioning case, by arranging each pipe in the through hole of the partition, the inside / outside air double layer mode It is possible to suppress changes in the air volume ratio of the outside air passage and the inside air passage at the time.

1 Vehicle air conditioning unit 12 Air conditioning case 121 Upper layer passage (outside air passage)
122 Lower passage (inside air passage)
13 partition wall portion 130 through hole 16 heat exchanger for cooling 54 high pressure refrigerant pipe (heat medium supply pipe)
55 Low pressure refrigerant piping (heat medium discharge pipe)

Claims (8)

A vehicle air conditioning unit configured to be capable of setting inside and outside air two-layer mode in which inside air and outside air are divided and flowed,
An interior air inlet (124, 125) communicating with the interior of the vehicle and an exterior air inlet (123) communicating with the exterior of the vehicle are formed, and air introduced from at least one of the interior air inlet and the exterior air inlet is An air conditioning case (12) that flows into the room,
A heat exchanger (16, 18) installed inside the air conditioning case, which exchanges heat between the heat medium and the air flowing inside the air conditioning case to adjust the temperature of the air flowing inside the air conditioning case;
A heat medium supply pipe (19, 54) for supplying a heat medium to the heat exchanger;
A heat medium discharge pipe (20, 55) for discharging a heat medium from the heat exchanger;
An outside air passage (121) for flowing outside air introduced from the outside air introduction port in the inside / outside air double layer mode into the inside of the air conditioning case, and an inside air introduction port in the inside / outside air double layer mode A partition (13) is set to define the inside air passage (122) for flowing the inside air.
A vehicle air-conditioning unit, wherein the partition portion is formed with a through hole (130) for allowing the heat medium supply pipe and the heat medium discharge pipe to pass through. The heat medium supply pipe and the heat medium discharge pipe constitute a high temperature pipe (19, 54) in which a heat medium having a temperature higher than that of the heat medium flowing through the other pipe constitutes one pipe. (20, 55), and
The low temperature piping is disposed on the outside air passage side of the through hole in comparison with the high temperature piping,
The vehicle air conditioning unit according to claim 1, wherein the high temperature pipe is disposed closer to the inside air passage in the through hole than the low temperature pipe.   The heat medium supply pipe and the heat medium discharge pipe are arranged along the air flow direction of the air flowing through the inside of the air conditioning case in the through hole, so that one pipe is inside the air conditioning case than the other pipe. The vehicle air conditioning unit according to claim 1, wherein the air conditioning unit is disposed at a position on the upstream side of the air flow.   The heat medium supply pipe and the heat medium discharge pipe constitute a high temperature pipe (19, 54) through which a heat medium having a temperature higher than that of the heat medium flowing through the other pipe forms the high temperature pipe (19, 54). The air conditioning unit for vehicles according to claim 3 which constitutes low temperature piping (20, 55). The heat medium supply pipe and the heat medium discharge pipe constitute a high temperature pipe (19, 54) in which a heat medium having a temperature higher than that of the heat medium flowing through the other pipe constitutes one pipe. (20, 55), and
The low temperature piping is disposed on the inside air passage side of the through hole in comparison with the high temperature piping,
The vehicle air conditioning unit according to claim 1, wherein the high temperature piping is disposed closer to the outside air passage side than the low temperature piping in the through hole.   6. The heat medium supply pipe and the heat medium discharge pipe according to any one of claims 1 to 5, wherein the heat medium supply pipe and the heat medium discharge pipe are inserted into a single through hole in a state of being bundled adjacent to each other. Vehicle air conditioning unit.   The heat exchanger (16) according to any one of claims 1 to 6, wherein the heat exchanger is a heat exchanger (16) for cooling the air flowing inside the air conditioning case by heat exchange between a heat medium and the air flowing inside the air conditioning case. Vehicle air conditioning unit according to any one.   The heat exchanger (18) according to any one of claims 1 to 6, wherein the heat exchanger is a heat exchanger (18) for heating the air flowing inside the air conditioning case by heat exchange between a heat medium and the air flowing inside the air conditioning case. Vehicle air conditioning unit according to any one.

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