JP2019162894A - Air conditioning unit for vehicle - Google Patents

Abstract

To provide an air conditioning unit that can downsize a body of an air blower at an air flow downstream side.SOLUTION: An air conditioning unit for a vehicle 10 includes an air blower 16, a casing 12 in which a first flow passage 120a and a second flow passage 120b are formed, an inside/outside air switching part 14, an evaporator 18, and a heater core 20. The air blower 16 is configured to include a first fan 161 disposed in the first flow passage 120a and a second fan 162 disposed in the second flow passage 120b. The inside/outside air switching part 14 is configured so as to be able to introduce outside air into the first flow passage 120a and inside air into the second flow passage 120b. The evaporator 18 is disposed within the casing 12 and among the inside/outside air switching part 14, and, the first fan 161 and second fan 162.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a vehicle air conditioning unit that air-conditions a vehicle interior.

  Conventionally, as an air conditioning unit for a vehicle, air outside the vehicle compartment is blown out to the upper side of the vehicle interior via one of the two air passages formed inside the casing, and the air inside the vehicle compartment is blown out to the lower side of the vehicle interior via the other. What is possible is known (see, for example, Patent Document 1). In this type of vehicle air conditioning unit, a blower, a cooling heat exchanger, and a heating heat exchanger are arranged in this order from the upstream side of the air flow inside the casing.

JP2012-209919A

  By the way, the cooling heat exchanger and the heating heat exchanger arranged inside the casing need to secure air temperature controllability and reduce ventilation resistance, and require a larger installation space than the blower. Become.

  Therefore, as in Patent Document 1, in a vehicle air conditioning unit in which a blower, a cooling heat exchanger, and a heating heat exchanger are arranged in order from the upstream side of the air flow inside the casing, the physique on the downstream side of the blower air flow is arranged. It is difficult to avoid the increase. The increase in the physique on the downstream side of the air flow of the blower can be a factor that deteriorates the mountability of the vehicle air conditioning unit on the vehicle.

  An object of the present disclosure is to provide a vehicle air conditioning unit capable of reducing the size of the physique on the air flow downstream side of the blower.

In order to achieve the above object, the invention described in claim 1
An air conditioning unit for a vehicle that air-conditions a vehicle interior,
A blower (16) for generating an airflow toward the passenger compartment;
A casing (12) in which a first flow path (120a) and a second flow path (120b) are formed as a flow path of the air flow generated by the blower;
An inside / outside air switching unit (14) for introducing at least one of vehicle interior air and vehicle exterior air into the casing;
A cooling heat exchanger (18) that is disposed so as to straddle the first flow path and the second flow path in the casing and cools the air flowing in the casing;
A heating heat exchanger (20) that is disposed so as to straddle the first flow path and the second flow path on the air flow downstream side of the blower in the interior of the casing, and heats the air flowing in the casing.

  The blower includes a first fan (161) disposed in the first flow passage and a second fan (162) disposed in the second flow passage. The inside / outside air switching unit is configured to be able to introduce vehicle interior air into the first flow passage and introduce vehicle interior air into the second flow passage. And the heat exchanger for cooling is arrange | positioned between the 1st fan in the inside of a casing, a 2nd fan, and an inside / outside air switching part.

  According to this, it becomes possible to blow the vehicle interior air into the vehicle compartment through the second flow passage while blowing the vehicle exterior air into the vehicle compartment through the first flow passage formed inside the casing. In particular, the vehicle air conditioning unit according to the present disclosure does not need to provide an installation space for the cooling heat exchanger on the downstream side of the air flow of the blower. Therefore, when the cooling heat exchanger is disposed on the downstream side of the air flow of the blower, In comparison, the size of the physique on the downstream side of the air flow of the blower can be reduced.

  Reference numerals in parentheses attached to each component and the like indicate an example of a correspondence relationship between the component and the like and specific components described in the embodiments described later.

It is a schematic block diagram of the vehicle air conditioning unit which concerns on 1st Embodiment. It is a schematic diagram which shows the example of mounting to the vehicle the air conditioning unit for vehicles which concerns on 1st Embodiment. It is a typical block diagram which shows the control apparatus of the vehicle air conditioner unit which concerns on 1st Embodiment. It is a schematic diagram which shows the state of the inside / outside air switching part at the time of outside air mode. It is a schematic diagram which shows the state of the inside / outside air switching part at the time of inside air mode. It is a schematic diagram which shows the state of the internal / external air switching part at the time of internal / external air mode, and the flow of the air inside a casing. It is a schematic block diagram of the vehicle air conditioning unit which concerns on 2nd Embodiment. It is a schematic diagram which shows the state of the internal / external air switching part at the time of internal / external air mode, and the flow of the air inside a casing.

  Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following embodiments, the same or equivalent parts as those described in the preceding embodiments are denoted by the same reference numerals, and the description thereof may be omitted. Further, in the embodiment, when only a part of the constituent elements are described, the constituent elements described in the preceding embodiment can be applied to the other parts of the constituent elements. The following embodiments can be partially combined with each other even if they are not particularly specified as long as they do not cause any trouble in the combination.

(First embodiment)
The present embodiment will be described with reference to FIGS. The vehicle air conditioning unit 10 air-conditions the passenger compartment. The vehicle air-conditioning unit 10 is an internal / external air two-layer unit that can be set to an internal / external air mode that distinguishes between vehicle exterior air (hereinafter also referred to as “outside air”) and vehicle interior air (hereinafter also referred to as “inside air”). It is configured.

  As shown in FIG. 1, the vehicle air conditioning unit 10 includes a casing 12 that forms an outer shell thereof. The casing 12 is formed with an airflow passage toward the passenger compartment. The casing 12 is provided with a partition portion 121 for partitioning the internal flow passage vertically. The inside of the casing 12 is divided by a partition 121 into a first flow passage 120a on the upper side and a second flow passage 120b on the lower side.

  An inside / outside air switching unit 14 is provided at the most upstream part of the air flow of the casing 12. The inside / outside air switching unit 14 is for introducing at least one of the inside air and outside air of the casing 12.

  The inside / outside air switching unit 14 introduces inside air into the outside air introduction port 141 for introducing outside air into the first flow passage 120a, the first inside air introduction port 142 for introducing inside air into the first flow passage 120a, and the second flow passage 120b. A second inside air introduction port 143 is formed. In addition, a communication passage 144 that guides the outside air introduced from the outside air introduction port 141 to the second flow passage 120b is formed inside the inside / outside air switching unit 14.

  Inside the inside / outside air switching unit 14, a first opening / closing door 145 that selectively opens and closes the first inside air introduction port 142 and the outside air introduction port 141 is provided. In addition, a second opening / closing door 146 that selectively opens and closes the second inside air introduction port 143 and the communication path 144 is provided inside the inside / outside air switching unit 14.

  The inside / outside air switching unit 14 is configured such that the first opening / closing door 145 opens the outside air introduction port 141 and closes the first inside air introduction port 142, and the second opening / closing door 146 opens the second inside air introduction port 143 and communicates with the communication path 144. Can be set to the closing position. Accordingly, the inside / outside air switching unit 14 is configured to be able to introduce outside air into the first flow passage 120a and introduce inside air into the second flow passage 120b. In other words, when the inside / outside air switching unit 14 introduces outside air into the first flow passage 120a and introduces inside air into the second flow passage 120b, the first opening / closing door 145 is in a position to open the outside air introduction port 141, The second opening / closing door 146 is configured to open the second inside air introduction port 143.

  Specifically, the first opening / closing door 145 is configured as a cantilever door having a rotating shaft 145a driven by the electric actuator M1 and a plate-like door main body 145b connected to the rotating shaft 145a. Similarly, the second opening / closing door 146 is configured as a cantilever door having a rotating shaft 146a driven by the electric actuator M2 and a plate-like door main body 146b connected to the rotating shaft 146a. The operation of the electric actuators M1 and M2 of the open / close doors 145 and 146 is controlled by a control signal output from the control device 100 described later. Each of the open / close doors 145 and 146 is not limited to a cantilever door, and may be a rotary door or a film door.

  Inside the casing 12, a blower 16 that generates an airflow toward the vehicle interior is disposed. The blower 16 is an electric blower that is driven by power feeding. The blower 16 includes a first fan 161, a second fan 162, and an electric motor 163.

  The first fan 161 is disposed in the first flow passage 120a. The first fan 161 is configured by a centrifugal fan that blows out air sucked along the axis of the rotating shaft toward the outside of the axis of the rotating shaft. The second fan 162 is disposed in the second flow passage 120b. Similar to the first fan 161, the second fan 162 is a centrifugal fan. The electric motor 163 rotates and drives the first fan 161 and the second fan 162. The electric motor 163 has a shaft 163 a connected to the first fan 161 and the second fan 162. The electric motor 163 of the present embodiment is disposed on the first flow path 120a side.

  An evaporator 18 is disposed inside the casing 12 on the upstream side of the air flow of the blower 16. That is, the evaporator 18 is arranged in a gap generated between the inside / outside air switching unit 14 and the first fan 161 and the second fan 162 in the casing 12. The evaporator 18 is a heat exchanger that constitutes a vapor compression refrigeration cycle including a compressor, a radiator, and a decompression device. The evaporator 18 uses the latent heat of vaporization of the refrigerant flowing inside the air to flow inside the casing 12. Cool down. In the present embodiment, the evaporator 18 constitutes a cooling heat exchanger that cools the air flowing inside the casing 12.

  The evaporator 18 is arrange | positioned so that the 1st flow path 120a and the 2nd flow path 120b may be straddled. The upper portion of the evaporator 18 is positioned in the first flow passage 120a, and the lower portion is positioned in the second flow passage 120b. For this reason, the air flowing through the first flow passage 120a is cooled at the upper portion of the evaporator 18. Moreover, the air which flows through the 2nd flow path 120b is cooled in the site | part of the evaporator 18 below.

  An air filter 19 is disposed between the inside / outside air switching unit 14 and the evaporator 18 inside the casing 12. That is, the air filter 19 is disposed in a gap generated between the inside / outside air switching unit 14 and the evaporator 18 inside the casing 12. The air filter 19 is a member for suppressing entry of foreign matter into the casing 12. The air filter 19 is disposed so as to straddle the first flow passage 120a and the second flow passage 120b.

  In addition, a heater core 20 is disposed inside the casing 12 on the downstream side of the air flow of the blower 16. The heater core 20 is a heat exchanger for heating that heats the air flowing in the casing 12 by using cooling water of an engine EG described later as a heat source. The heater core 20 is connected to a pipe TB constituting a circuit C through which the cooling water flows.

  The heater core 20 is disposed so as to straddle the first flow passage 120a and the second flow passage 120b. The upper part of the heater core 20 is positioned in the first flow path 120a, and the lower part is positioned in the second flow path 120b. For this reason, the air flowing through the first flow passage 120a is heated at the upper portion of the heater core 20. In addition, air flowing through the second flow passage 120b is heated at a lower portion of the heater core 20.

  In the casing 12, a first bypass passage 120c is formed on the upper side of the heater core 20 in the first flow passage 120a to flow air around the heater core 20. The first flow passage 120 a is configured such that the air flowing through the first bypass passage 120 c and the air passing through the heater core 20 merge on the downstream side of the air flow of the heater core 20.

  In the casing 12, a second bypass passage 120d that bypasses the heater core 20 and flows air is formed below the heater core 20 in the second flow passage 120b. The second flow passage 120b is configured such that the air flowing through the second bypass passage 120d and the air passing through the heater core 20 merge on the downstream side of the air flow of the heater core 20.

  In the first flow passage 120a of the casing 12, a first air mix door 22 that adjusts the flow rate ratio of the air passing through the heater core 20 and the air passing through the first bypass passage 120c is provided. The first air mix door 22 is provided between the first fan 161 and the heater core 20. The first air mix door 22 is constituted by a cantilever door having a rotary shaft 221 driven by the electric actuator M3 and a plate-like door body portion 222 connected to the rotary shaft 221. The operation of the electric actuator M3 of the first air mix door 22 is controlled by a control signal output from the control device 100 described later. In addition, the 1st air mix door 22 is not restricted to a cantilever door, For example, you may be comprised by the film door.

  The second air passage 120b of the casing 12 is provided with a second air mix door 24 that adjusts the flow rate ratio of the air passing through the heater core 20 and the air passing through the second bypass passage 120d. The second air mix door 24 is provided between the second fan 162 and the heater core 20. The second air mix door 24 is constituted by a cantilever door having a rotary shaft 241 driven by the electric actuator M4 and a plate-like door main body portion 242 connected to the rotary shaft 241. The operation of the electric actuator M4 of the second air mix door 24 is controlled by a control signal output from the control device 100 described later. In addition, the 2nd air mix door 24 is not restricted to a cantilever door, For example, you may be comprised by the film door.

  A defroster opening 122, a face opening 123, and a foot opening 124 are formed at the most downstream portion of the air flow of the casing 12 to guide the airflow flowing inside the casing 12 into the vehicle interior.

  The defroster opening 122 is an opening hole for guiding the airflow flowing inside the casing 12 to the windshield of the vehicle. The defroster opening 122 is provided in a portion of the casing 12 that forms the first flow passage 120a. Although not shown, the defroster opening 122 communicates with a defroster outlet formed in the instrument panel IP through a duct.

  The face opening 123 is an opening hole for guiding the airflow flowing inside the casing 12 to the upper body of the occupant. Similar to the defroster opening 122, the face opening 123 is provided in a portion of the casing 12 where the first flow passage 120 a is formed. Although not shown, the face opening 123 communicates with a face outlet formed in the instrument panel IP via a duct.

  The foot opening 124 is an opening hole for guiding the airflow flowing inside the casing 12 to the lower body of the occupant. The foot opening 124 is provided in a part of the casing 12 where the second flow passage 120b is formed. Although not shown, the foot opening 124 communicates with the foot outlet opening inside the instrument panel IP through the duct.

  A defroster door 26, a face door 28, and a foot door 30 are provided inside the casing 12. The defroster door 26 is a door that opens and closes the defroster opening 122, and is provided on the upstream side of the defroster opening 122. The face door 28 is a door that opens and closes the face opening 123, and is provided on the upstream side of the face opening 123. The foot door 30 is a door that opens and closes the foot opening 124, and is provided on the upstream side of the foot opening 124.

  Here, the partition portion 121 is formed with a downstream communication passage 121a that connects the first flow passage 120a and the second flow passage 120b on the downstream side of the air flow of the heater core 20. The downstream communication path 121a is opened and closed by the foot door 30. That is, the foot door 30 of the present embodiment is configured to selectively open and close the foot opening 124 and the downstream communication path 121a.

  The defroster door 26, the face door 28, and the foot door 30 are configured such that their respective rotation shafts are connected via a link mechanism (not shown) and are displaced by a common electric actuator M5. The operation of the electric actuator M5 shared by the doors 26, 28, and 30 is controlled by a control signal output from the control device 100 described later.

  In the vehicular air conditioning unit 10 configured as described above, the evaporator 18 is disposed on the upstream side of the air flow of the blower 16 inside the casing 12, and the heater core 20 is disposed on the downstream side of the air flow of the blower 16. Below, the site | part in which the air blower 16 and the evaporator 18 in the casing 12 are arrange | positioned may be called cooler site | part 10A, and the site | part in which the heater core 20 in the casing 12 is arrange | positioned may be called heater site | part 10B.

  Next, an example of mounting the vehicle air conditioning unit 10 on a vehicle will be described with reference to FIG. As shown in FIG. 2, the vehicle air conditioning unit 10 is disposed inside the foremost instrument panel IP in the vehicle interior.

  The instrument panel IP is positioned on the vehicle rear side with respect to the firewall FW. The firewall FW is a metal wall that is disposed on the front side of the vehicle with respect to the vehicle interior and divides the vehicle interior and a device storage chamber MR in which various devices for driving the vehicle including the engine EG are stored. . The firewall FW extends along the vehicle width direction DRw.

  An engine EG is disposed in the device storage chamber MR at a substantially central portion in the vehicle width direction DRw. When the physique of the engine EG is large in the front-rear direction DRfr of the vehicle, a substantially central portion of the firewall FW in the width direction DRw of the vehicle is configured to swell toward the vehicle rear side. That is, the firewall FW has a bulging portion EP in which a substantially central portion in the vehicle width direction DRw bulges toward the vehicle rear side.

  In the case of such a structure, the distance between the firewall FW and the instrument panel IP is reduced on the vehicle rear side of the engine EG. That is, the space inside the instrument panel IP is reduced on the vehicle rear side of the engine EG. For this reason, the installation space of the vehicle air conditioning unit 10 on the vehicle rear side of the engine EG is greatly limited.

  Therefore, in the present embodiment, the heater part 10B in the vehicle air conditioning unit 10 is arranged on the vehicle rear side of the engine EG, and the cooler part 10A is arranged in an offset state in the vehicle width direction DRw with respect to the heater part 10B. ing. That is, the cooler part 10A is disposed at a position shifted in the vehicle width direction DRw with respect to the heater part 10B. Specifically, the cooler part 10A is arranged at a position avoiding the bulging part EP in the firewall FW.

  Here, in the space on the driver's seat side inside the instrument panel IP, it is necessary to accommodate equipment (for example, a steering support member) required for driving operation. For this reason, it is desirable to arrange the cooler part 10A on the passenger seat side (left side in this example) in the vehicle width direction DRw.

  The cooler portion 10A is arranged in the vehicle width direction DRw so as to be away from the center in the vehicle width direction DRw in the order of the inside / outside air switching unit 14, the air filter 19, the evaporator 18, and the blower 16. The cooler portion 10A has a posture in which the air filter 19 and the evaporator 18 stand up and down so that the size of the vehicle in the width direction DRw of the vehicle does not become too large, and the ventilation surface thereof extends along the front-rear direction DRfr. Is arranged.

  Further, the cooler part 10 </ b> A is configured so that the inside air inlets 142 and 143 face the ventilation surfaces of the air filter 19 and the evaporator 18 so that the inside air is easily introduced into the air filter 19 and the evaporator 18. Is provided.

  Next, the control device 100 which is an electronic control unit of the vehicle air conditioning unit 10 will be described with reference to FIG. The control device 100 includes a known microcomputer including a processor 100a and a memory 100b and peripheral circuits thereof. The memory 100b is composed of a non-transitional tangible storage medium.

  As shown in FIG. 3, on the input side of the control device 100, an outside air temperature sensor 101 that detects the outside air temperature Tam, an inside air temperature sensor 102 that detects the inside air temperature Tr, and a solar radiation sensor 103 that detects the amount of solar radiation Ts in the vehicle interior. Etc. are connected. An operation panel 110 provided with an air conditioning switch 110a for setting on / off of the air conditioning operation and a temperature setting switch 110b for setting a set temperature Tset in the passenger compartment is connected to the input side of the control device 100.

  On the other hand, various devices such as electric actuators M1 to M5 for driving the electric motor 163 of the blower 16 and the various doors 145, 146, 22, 24, 26, 28, and 30 are connected to the output side of the control device 100. .

  The control device 100 performs arithmetic processing on information read from a device connected to the input side by a control program stored in the memory 100b. And the control apparatus 100 outputs a control signal with respect to the various control apparatuses connected to the output side based on the processing result etc. of arithmetic processing.

For example, the control device 100 calculates a target blowing temperature TAO that is a target temperature of the blowing air blown into the vehicle interior based on information read from a device connected to the input side. For example, the control device 100 calculates the target blowing temperature TAO based on the following formula F1.
TAO = Kset × Tset−Kr × Tr−Kam × Tam−Ks × Ts + C (F1)
Here, Tset is a set temperature set by the temperature setting switch 110b. Tr is the inside air temperature detected by the inside air temperature sensor 102. Tam is the outside air temperature detected by the outside air temperature sensor 101. Ts is the amount of solar radiation detected by the solar radiation sensor 103. Kset, Kr, and Kam are control gains. C is a constant for correction.

  The control device 100 controls the electric motor 163 of the blower 16, the electric actuators M3 and M4 of the air mix doors 22 and 24, and the electric actuator M5 of the doors 26, 28, and 30 based on the target blowing temperature TAO.

  Further, the control device 100 controls the open / close doors 145 and 146 of the inside / outside air switching unit 14 based on information such as the inside temperature Tr and the outside temperature Tam. Specifically, the control device 100 controls the open / close doors 145 and 146 of the inside / outside air switching unit 14 to change the air suction mode into the casing 12 to any one of the outside air mode, the inside air mode, and the inside / outside air mode. change.

  The control device 100 basically controls the open / close doors 145 and 146 of the inside / outside air switching unit 14 so as to be in the outside air mode. Specifically, in the outside air mode, the control device 100 opens and closes the first opening / closing door 145 so that the first opening / closing door 145 opens the outside air introduction port 141 and closes the first inside air introduction port 142 as shown in FIG. Control the door 145. In addition, the control device 100 controls the second opening / closing door 146 so that the second opening / closing door 146 is positioned to open the communication path 144 and close the second inside air introduction port 143 in the outside air mode.

  The control device 100 controls the open / close doors 145 and 146 of the inside / outside air switching unit 14 so as to be in the inside air mode when the temperature difference between the inside temperature Tr and the outside temperature Tam is large and the ventilation loss due to the introduction of outside air becomes large. To do. Specifically, in the inside air mode, the control device 100 opens and closes the first opening / closing door 145 so that the first opening / closing door 145 opens the first inside air introduction port 142 and closes the outside air introduction port 141 as shown in FIG. Control the door 145. Further, the control device 100 controls the second opening / closing door 146 so that the second opening / closing door 146 is positioned to open the second inside air introduction port 143 and close the communication path 144 in the inside air mode.

  The control device 100 controls the open / close doors 145 and 146 of the inside / outside air switching unit 14 so as to enter the inside / outside air mode when the ventilation loss due to the introduction of outside air becomes large and fogging of the window glass of the vehicle is predicted. To do.

  Specifically, in the inside / outside air mode, the control device 100 sets the first opening / closing door 145 so that the first open / close door 145 opens the outside air introduction port 141 and closes the first inside air introduction port 142 as shown in FIG. The open / close door 145 is controlled. In addition, the control device 100 controls the second opening / closing door 146 so that the second opening / closing door 146 is positioned to open the second inside air introduction port 143 and close the communication path 144 in the inside / outside air mode.

  The inside / outside air mode is a suction mode for preventing fogging of the window glass of the vehicle while suppressing loss of ventilation due to introduction of outside air. The fogging of the window glass is likely to occur in winter when the outside temperature is low and the passenger compartment needs to be heated.

  For this reason, the control device 100 controls the defroster door 26 at a position where the defroster opening 122 is opened and controls the face door 28 at a position where the face opening 123 is closed in the inside / outside air mode. In addition, the control device 100 controls the foot door 30 to a position where the foot opening 124 is opened and the downstream communication path 121a is closed.

  Next, the operation of the vehicle air conditioning unit 10 in the inside / outside air mode will be described with reference to FIG. FIG. 6 illustrates a state in which the air mix doors 22 and 24 are controlled to positions that close the bypass passages 120c and 120d. In the inside / outside air mode, the air mix doors 22 and 24 may be controlled to positions where the bypass passages 120c and 120d are opened.

  As shown in FIG. 6, when the air-conditioning switch 110 a is turned on and the fans 161 and 162 of the blower 16 are rotationally driven, an air flow toward the vehicle interior is generated inside the casing 12. Thereby, outside air is introduced into the first flow passage 120a through the outside air introduction port 141, and inside air is introduced into the second flow passage 120b through the second inside air introduction port 143.

  The outside air introduced into the first flow passage 120a is blown out toward the inner surface of the window glass in the vehicle interior via the air filter 19, the evaporator 18, the first fan 161, the heater core 20, the defroster opening 122, and the like. Thereby, the relative humidity in the vicinity of the inner surface of the window glass is lowered, so that the window glass is hardly fogged.

  On the other hand, the inside air introduced into the second flow passage 120b is blown out toward the lower body of the occupant through the air filter 19, the evaporator 18, the second fan 162, the heater core 20, the foot opening 124, and the like. As a result, the temperature in the vicinity of the lower body of the occupant is adjusted to an appropriate temperature.

  In the vehicle air-conditioning unit 10 described above, the evaporator 18 is disposed between the first fan 161 and the second fan 162 and the inside / outside air switching unit 14 in the casing 12. According to this, it is not necessary to provide an installation space for the evaporator 18 on the air flow downstream side of the blower 16. For this reason, compared with the case where the evaporator 18 is arrange | positioned in the air flow downstream of the air blower 16, size reduction of the physique of the air flow downstream of the air blower 16 can be achieved. Further, when the physique on the downstream side of the air flow of the blower 16 is simply downsized, it is conceivable to arrange the blower 16 on the downstream side of the heater core 20. However, when the blower 16 is disposed on the downstream side of the heater core 20, the distance between the blower 16 and each of the openings 122 to 124 is reduced. This is not preferable because the airflow flowing through the openings 122 to 124 is greatly disturbed, or noise of the blower 16 is easily transmitted to the vehicle interior via the openings 122 to 124. On the other hand, in the vehicle air conditioning unit 10 of the present embodiment, the heater core 20 is disposed on the downstream side of the blower 16. According to this, when the air flow blown out from the blower 16 passes through the heater core 20, turbulence of the air flow flowing through the openings 122 to 124 can be suppressed. Moreover, since the heater core 20 functions as a soundproof member that suppresses noise of the blower 16, it is possible to suppress the noise of the blower 16 from being transmitted to the vehicle interior via the openings 122 to 124. Therefore, the vehicle air conditioning unit 10 can suppress the noise of the blower and the disturbance of the airflow flowing through the openings 122 to 124 while reducing the size of the blower 16 on the downstream side.

  Specifically, in the vehicle air-conditioning unit 10, the heater part 10B in the casing 12 is disposed on the vehicle rear side of the engine EG, and the cooler part 10A and the inside / outside air switching unit 14 are in the vehicle width direction DRw with respect to the heater part 10B. It is arranged in an offset state. According to this, even if the installation space of the vehicle air conditioning unit 10 is greatly restricted on the vehicle rear side of the engine EG, the vehicle air conditioning unit 10 can be mounted on the vehicle.

  In particular, in the vehicle air conditioning unit 10, the bypass passages 120c and 120d are formed in the heater part 10B, and the air mix doors 22 and 24 are provided. For this reason, if the cooler part 10A including the evaporator 18 is disposed on the upstream side of the air flow of the blower 16, the physique on the downstream side of the air flow of the blower 16 can be downsized. It becomes possible to avoid the deterioration of the mountability to the vehicle.

  Here, in the configuration in which the cooler part 10A is not interposed between the heater part 10B and the engine EG, the heater core 20 and the engine EG can be brought close to each other. According to this, since the pipe TB connecting the heater core 20 and the engine EG can be shortened, the circuit C through which the cooling water for the engine EG flows can be simplified. Such simplification contributes to the improvement of the mountability of the vehicle air conditioning unit 10.

  In the vehicle air conditioning unit 10 of the present embodiment, the second open / close door 146 of the inside / outside air switching unit 14 closes the communication passage 144 between the first flow passage 120a and the second flow passage 120b in the inside / outside air mode. It is configured. Thus, in the vehicle air conditioning unit 10, the second opening / closing door 146 functions as a partition member that partitions the first flow passage 120 a and the second flow passage 120 b in the inside / outside air switching unit 14 in the inside / outside air mode. According to this, compared with the case where a dedicated door for opening and closing the communication path 144 is provided, the number of parts of the inside / outside air switching unit 14 is reduced, and the inside / outside air switching unit 14 can be downsized. Since downsizing of the inside / outside air switching unit 14 leads to suppression of an increase in the size of the air blower 16 on the upstream side of the air flow, it greatly contributes to downsizing of the vehicle air conditioning unit 10 as a whole.

  In the vehicle air conditioning unit 10, an air filter 19 for suppressing entry of foreign matter is disposed between the inside / outside air switching unit 14 and the evaporator 18. According to this, since the foreign matter from the outside can be removed by the air filter 19 before flowing into the evaporator 18, an increase in the ventilation resistance of the evaporator 18 due to the foreign matter can be avoided. Further, in the configuration in which the air filter 19 is disposed on the upstream side of the blower 16, the physique on the downstream side of the blower 16 in the vehicle air conditioning unit 10 is compared with the configuration in which the air filter 19 is disposed on the downstream side of the blower 16. Can be suppressed.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. When the blower 16 is an electric blower as in the first embodiment, it is necessary to cool the electric motor 163 in order to avoid abnormal heat generation of the electric motor 163. Therefore, the vehicle air conditioning unit 10 of the present embodiment has a structure capable of cooling the electric motor 163 of the blower 16. In the present embodiment, portions different from those in the first embodiment will be mainly described, and description of similar portions may be omitted.

  As shown in FIG. 7, the vehicle air conditioning unit 10 is provided with a cooling passage 128 for the casing 12. The cooling passage portion 128 is for guiding air for cooling the electric motor 163 of the blower 16 to the periphery of the electric motor 163.

  Here, as a cooling method of the electric motor 163, for example, it is conceivable to use low-temperature air cooled by the evaporator 18, but in this case, the surface temperature of the electric motor 163 is excessively lowered, and the electric motor Condensation may occur on the surface of 163. Such condensation is not preferable because it causes a decrease in insulation and a failure of the electric motor 163.

  Therefore, in the vehicle air conditioning unit 10 of the present embodiment, the cooling passage portion 128 is upstream of the evaporator 18 in the casing 12 so that the air upstream of the evaporator 18 in the casing 12 is guided to the electric motor 163. It is connected to the side part. Specifically, the cooling passage portion 128 is connected to a portion of the casing 12 upstream of the evaporator 18 and forming a first flow passage 120a through which outside air flows in the inside / outside air mode.

  Other configurations are the same as those of the first embodiment. As shown in FIG. 8, the vehicle air conditioning unit 10 of the present embodiment is configured such that a part of the air on the upstream side of the evaporator 18 is supplied to the electric motor 163 through the cooling passage portion 128. According to this, since it is possible to suppress an excessive decrease in the surface temperature of the electric motor 163, it is possible to avoid problems associated with condensation on the surface of the electric motor 163.

  In particular, in the vehicle air conditioning unit 10 of the present embodiment, the cooling passage portion 128 is connected to the first flow passage 120a. The first flow passage 120a circulates outside air whose relative humidity tends to be lower than that of the inside air in the inside / outside air mode. For this reason, the generation of condensation on the surface of the electric motor 163 can be sufficiently suppressed by connecting the cooling passage portion 128 to the first flow passage 120a.

(Modification of the second embodiment)
In the second embodiment described above, an example in which the cooling passage portion 128 is connected to the first flow passage 120a through which the outside air flows in the inside / outside air mode in the upstream side of the evaporator 18 in the casing 12 has been described. It is not limited to this. When the electric motor 163 is disposed on the second flow passage 120b side, the cooling passage portion 128 may be connected to the second flow passage 120b.

(Other embodiments)
As mentioned above, although typical embodiment of this indication was described, this indication is not limited to the above-mentioned embodiment, for example, can be variously changed as follows.

  As in the above-described embodiments, it is desirable that the second opening / closing door 146 of the inside / outside air switching unit 14 functions as a member that partitions the first flow path 120a and the second flow path 120b in the inside / outside air mode. Not. The inside / outside air switching unit 14 may be configured to open and close the communication path 144 with a dedicated door, for example.

  In each of the above-described embodiments, examples in which the first fan 161 and the second fan 162 of the blower 16 are centrifugal fans have been described. However, the present invention is not limited to this. The first fan and the second fan 162 may be configured by a fan other than the centrifugal fan (for example, an axial fan).

  In each of the above-described embodiments, the example in which the first fan 161 and the second fan 162 are rotationally driven by the common electric motor 163 as the blower 16 has been described, but is not limited thereto. For example, the blower 16 may be configured such that each of the first fan 161 and the second fan 162 is rotationally driven by an independent electric motor. Moreover, in each above-mentioned embodiment, although the electric motor 163 illustrated the structure arrange | positioned at the 1st flow path 120a side, it is not limited to this. For example, the electric motor 163 may be configured to be disposed on the second flow path 120a side or between the first fan 161 and the second fan 162.

  In each above-mentioned embodiment, although evaporator 18 was illustrated as a heat exchanger for cooling, it is not limited to this. The cooling heat exchanger is not limited as long as it can cool the air, and may be composed of something other than the evaporator 18 (for example, a Peltier module).

  In each above-mentioned embodiment, although heater core 20 was illustrated as a heat exchanger for heating, it is not limited to this. The heating heat exchanger is not limited as long as it can heat air, and may be composed of other than the heater core 20 (for example, an electric heater).

  In each of the above-described embodiments, the vehicle air-conditioning unit 10 is exemplified by a configuration that adjusts the temperature of the air blown into the vehicle interior by the air mix doors 22 and 24, but is not limited thereto. The vehicle air conditioning unit 10 may be configured, for example, to adjust the temperature of air blown out into the passenger compartment by adjusting the heat dissipation capability of the heating heat exchanger. In such a configuration, since it is not necessary to provide the bypass passages 120c and 120d inside the casing 12, the air flow downstream side of the blower 16 can be downsized.

  In each of the above-described embodiments, the example in which the air filter 19 is disposed on the upstream side of the air flow of the evaporator 18 in the casing 12 has been described. For example, the air filter 19 may be disposed inside the inside / outside air switching unit 14.

  In each of the above-described embodiments, the heater part 10B is arranged on the vehicle rear side of the engine EG, and the cooler part 10A and the inside / outside air switching unit 14 are arranged in an offset state in the vehicle width direction DRw with respect to the heater part 10B. Although an example has been described, the present invention is not limited to this. In the vehicle air conditioning unit 10, for example, each of the cooler part 10 </ b> A, the heater part 10 </ b> B, and the inside / outside air switching unit 14 may be disposed at a substantially central part in the vehicle width direction DRw.

  In the above-described embodiment, it is needless to say that elements constituting the embodiment are not necessarily indispensable except for the case where it is clearly indicated that the element is essential and the case where it is considered that it is clearly essential in principle.

  In the above-described embodiment, when numerical values such as the number, numerical value, quantity, range, etc. of the constituent elements of the embodiment are mentioned, it is particularly limited to a specific number when clearly indicated as essential and in principle. Except in some cases, the number is not limited.

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

(Summary)
According to the 1st viewpoint shown by one part or all part of the above-mentioned embodiment, a vehicle air-conditioning unit is a fan, the casing in which the 1st flow path and the 2nd flow path were formed, the inside / outside air switching part, cooling Heat exchanger and heating heat exchanger. The blower is configured to include a first fan disposed in the first flow path and a second fan disposed in the second flow path. The inside / outside air switching unit is configured to be able to introduce vehicle interior air into the first flow passage and introduce vehicle interior air into the second flow passage. And the heat exchanger for cooling is arrange | positioned between the 1st fan in the inside of a casing, a 2nd fan, and an inside / outside air switching part.

  According to the 2nd viewpoint, the air blower of the vehicle air conditioning unit is comprised with the electric blower which drives a 1st fan and a 2nd fan with at least 1 electric motor. The casing is provided with a cooling passage portion that guides air for cooling the electric motor to the periphery of the electric motor. And the cooling channel | path part is comprised so that the air more upstream than the heat exchanger for cooling may be guide | induced to the circumference | surroundings of an electric motor among casings.

In this way, if it is configured to guide the air upstream of the cooling heat exchanger to the periphery of the electric motor through the cooling passage portion, it is possible to suppress an excessive decrease in the surface temperature of the electric motor,
Problems associated with condensation on the surface of the electric motor can be avoided.

  According to the third aspect, the vehicle air conditioning unit includes a cooler part in which a cooling heat exchanger and a blower in the casing are arranged, and a heater part in which the heating heat exchanger in the casing is arranged. The vehicle air-conditioning unit is disposed in a state where the heater part is disposed on the vehicle rear side of the engine that drives the vehicle, and the cooler part is offset in the vehicle width direction with respect to the heater part.

  When an engine having a large physique in the vehicle front-rear direction is mounted on the vehicle, the installation space of the vehicle air conditioning unit on the vehicle rear side of the engine may be greatly limited. For this reason, it is desirable that the vehicle air-conditioning unit be disposed in a state where the heater portion is disposed on the vehicle rear side of the engine and the cooler portion is offset from the heater portion in the vehicle width direction.

  According to the 4th viewpoint, the heat exchanger for a heating of the vehicle air conditioning unit is comprised by the heater core which heats the air which flows through the inside of a casing by using engine cooling water as a heat source. According to this, since the heater core and the engine can be brought close to each other, the circuit through which the engine coolant flows can be simplified. Such simplification contributes to an improvement in mountability of the vehicle air conditioning unit.

  According to the fifth aspect, the inside / outside air switching unit of the vehicle air conditioning unit is arranged in an offset state in the vehicle width direction with respect to the heater part. According to this, even when the installation space of the vehicle air conditioning unit on the vehicle rear side of the engine is greatly restricted, it is possible to ensure the mountability of the vehicle air conditioning unit on the vehicle.

  According to the sixth aspect, the inside / outside air switching unit of the vehicle air conditioning unit includes an outside air introduction port that introduces outside air into the first flow passage, and a first inside air introduction that introduces inside air into the first flow passage. And a second inside air introduction port for introducing vehicle interior air into the second flow passage.

  In addition, the inside / outside air switching unit includes a communication path that guides the outside air introduced from the outside air introduction port to the second flow passage, a first opening / closing door that selectively opens and closes the first inside air introduction port and the outside air introduction port, And a second open / close door that selectively opens and closes the second inside air introduction port and the communication passage. The inside / outside air switching unit opens the outside air inlet and opens the outside air inlet when the outside air is introduced into the first flow passage and the inside air is introduced into the second flow passage. It is comprised so that it may become a position which closes an inlet. The inside / outside air switching unit introduces outside air into the first flow passage and introduces inside air into the second flow passage, and the second open / close door opens the second inside air inlet, It is comprised so that it may become a position which closes a communicating path.

  In such a configuration, when the vehicle exterior air is introduced into the first flow passage and the vehicle interior air is introduced into the second flow passage, the second open / close door is connected to the first flow passage and the first flow passage in the inside / outside air switching unit. It functions as a partition member that partitions the two flow paths. According to this, compared with the case where the door for exclusive use which opens and closes a communicating path is provided, the number of parts of an inside / outside switching part decreases, and it becomes possible to achieve size reduction of an inside / outside air switching part. The downsizing of the inside / outside air switching unit leads to suppression of an increase in the physique on the upstream side of the air flow of the blower, and greatly contributes to improvement of the mounting of the vehicle air conditioning unit on the vehicle.

  According to the seventh aspect, the vehicle air conditioning unit includes an air filter for suppressing the intrusion of foreign matter. The air filter is disposed between the inside / outside air switching unit and the cooling heat exchanger. According to this, since the foreign matter from the outside can be removed by the air filter before flowing into the cooling heat exchanger, an increase in the ventilation resistance of the cooling heat exchanger due to the foreign matter can be avoided.

  According to the eighth aspect, the casing of the vehicle air conditioning unit is formed with the first bypass passage for flowing the air flowing through the first flow passage around the heat exchanger for heating, and the second flow passage. A second bypass passage is formed to flow the air flowing through the heat bypassing the heat exchanger. The casing includes a first air mix door for adjusting a flow rate ratio of air passing through the heat exchanger for heating and air passing through the first bypass passage, air passing through the heat exchanger for heating, and the first bypass passage. A second air mix door that adjusts the flow rate of the passing air is provided.

  In this way, in the configuration in which each bypass passage is provided on the side of the heating heat exchanger and the flow rate ratio of the air flowing into the heating heat exchanger by each air mix door and the air flowing through each bypass passage is adjustable, The size of the area near the heat exchanger for heating tends to increase. For this reason, in the above-described configuration, if the cooling heat exchanger is arranged on the upstream side of the air flow of the blower, the physique on the downstream side of the air flow of the blower can be downsized. It becomes possible to avoid the deterioration of the mounting property.

DESCRIPTION OF SYMBOLS 10 Vehicle air conditioning unit 12 Casing 120a 1st flow path 120b 2nd flow path 14 Inside / outside air switching part 16 Blower 161 1st fan 162 2nd fan 18 Evaporator (heat exchanger for cooling)
20 Heater core (heat exchanger for heating)

Claims (8)

An air conditioning unit for a vehicle that air-conditions a vehicle interior,
A blower (16) for generating an air flow toward the vehicle interior;
A casing (12) in which a first flow path (120a) and a second flow path (120b) are formed as a flow path of the air flow generated by the blower;
An inside / outside air switching unit (14) for introducing at least one of vehicle interior air and vehicle exterior air into the casing;
A cooling heat exchanger (18) for cooling the air flowing inside the casing and disposed so as to straddle the first flow path and the second flow path inside the casing;
A heat exchanger (20) for heating that heats the air flowing inside the casing and disposed so as to straddle the first flow path and the second flow path on the air flow downstream side of the blower in the casing. And comprising
The blower includes a first fan (161) disposed in the first flow path and a second fan (162) disposed in the second flow path,
The inside / outside air switching unit is configured to be able to introduce the vehicle compartment outside air into the first flow passage and introduce the vehicle compartment air into the second flow passage,
The cooling heat exchanger is an air conditioning unit for a vehicle disposed between the first fan, the second fan, and the inside / outside air switching unit in the casing. The blower is composed of an electric blower that drives the first fan and the second fan by at least one electric motor (163),
The casing is provided with a cooling passage (128) for guiding air for cooling the electric motor to the periphery of the electric motor,
2. The vehicle air conditioning unit according to claim 1, wherein the cooling passage portion is configured to guide air upstream of the cooling heat exchanger in the casing to the periphery of the electric motor. When the part where the cooling heat exchanger and the blower are arranged in the casing is a cooler part (10A), and the part where the heating heat exchanger is arranged in the casing is a heater part (10B),
The heater portion is disposed on the vehicle rear side of an engine (EG) that drives the vehicle,
3. The vehicle air conditioning unit according to claim 1, wherein the cooler part is disposed in an offset state in a vehicle width direction with respect to the heater part. 4.   4. The vehicle air conditioning unit according to claim 3, wherein the heating heat exchanger includes a heater core (20) that heats the air flowing through the casing using the cooling water of the engine as a heat source.   5. The vehicle air conditioning unit according to claim 3, wherein the inside / outside air switching unit is disposed in an offset state in a vehicle width direction with respect to the heater portion. The inside / outside air switching unit
An outside air inlet (141) for introducing outside air into the first flow passage;
A first inside air inlet (142) for introducing the vehicle interior air into the first flow passage;
A second inside air introduction port (143) for introducing the vehicle interior air into the second flow passage;
A communication path (144) for guiding the vehicle exterior air introduced from the outside air inlet to the second flow path;
A first opening / closing door (145) for selectively opening and closing the first inside air inlet and the outside air inlet;
A second opening / closing door (146) for selectively opening and closing the second inside air introduction port and the communication passage,
The first open / close door opens the outside air inlet and introduces the first inside air when the outside air inside the vehicle is introduced into the first flow passage and the air inside the vehicle is introduced into the second flow passage. The position according to any one of claims 1 to 5, wherein the opening is closed, and the second opening / closing door is configured to open the second inside air introduction port and close the communication path. Air conditioning unit for vehicles. Provided with an air filter (19) for suppressing the entry of foreign matter,
The vehicle air conditioning unit according to any one of claims 1 to 6, wherein the air filter is disposed between the inside / outside air switching unit and the cooling heat exchanger. In the casing,
A first bypass passage (120c) is formed to flow the air flowing through the first flow passage around the heating heat exchanger, and the air flowing through the second flow passage is transferred to the heating heat exchanger. A second bypass passage (120d) is formed to flow around
A first air mix door (22) for adjusting a flow rate ratio of air passing through the heating heat exchanger and air passing through the first bypass passage; and air passing through the heating heat exchanger and the second The vehicle air conditioning unit according to any one of claims 1 to 7, further comprising a second air mix door (24) for adjusting a flow rate of air passing through the bypass passage.

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