WO2018186126A1

WO2018186126A1 - Air conditioner for vehicle

Info

Publication number: WO2018186126A1
Application number: PCT/JP2018/009842
Authority: WO
Inventors: 角　省吾; 川田　洋; 牧野　正; 野口　純弘; 直記小川; 靖人福岡; 犬塚　正人; 足立　太
Original assignee: 株式会社デンソー; ダイハツ工業株式会社
Priority date: 2017-04-04
Filing date: 2018-03-14
Publication date: 2018-10-11
Also published as: MY196683A

Abstract

This vehicle air conditioner (1) is arranged in the ceiling portion (R) of a vehicle (C), and houses a fan (20) and an evaporator (50) inside of an air conditioning case (10). With the evaporator, the vehicle air conditioner adjusts the temperature of blown air (F) blown by the fan and supplies this to the vehicle cabin (I). So as to be thinner in the vertical direction of the vehicle, the evaporator in the vehicle air conditioner is configured with straight tube sections (52a) of multiple tubes (52) arranged side by side and spaced in the vehicle longitudinal direction and the vehicle vertical direction. The vehicle air conditioner comprises an air outlet (25) arranged in the vehicle rear side of the evaporator, a first inflow part (31) arranged in a position opposite of the air outlet with the evaporator interposed therebetween, and a second inflow part (32) arranged below the evaporator in the vertical direction of the vehicle. Thus, a vehicle air conditioner arranged in the ceiling portion of the vehicle can be provided that achieves greater overall device compactness and which can suppress stagnation in blown air inside of the heat exchange unit.

Description

Air conditioner for vehicles

Cross-reference of related applications

This application includes Japanese Patent Application No. 2017-074424 filed on Apr. 4, 2017 and Japanese Patent Application No. 2017 filed on Nov. 24, 2017, the disclosures of which are incorporated herein by reference. Based on -225833.

The present disclosure relates to a vehicle air conditioner that is disposed on a ceiling of a vehicle and used for air conditioning in a vehicle interior.

Conventionally, as a vehicle air conditioner for air-conditioning a vehicle interior, one installed on a ceiling portion of the vehicle interior is known. In the case of a vehicle air conditioner disposed on the ceiling, it is desired that the entire device be configured compactly in order to secure a passenger's living space as wide as possible under limited conditions such as vehicle size. .

The inventions described in Patent Documents 1 and 2 are known as techniques relating to such a vehicle air conditioner. The vehicle air conditioner described in Patent Document 1 is configured by accommodating a heat exchanger and a blower in an air conditioning casing disposed on the ceiling of the vehicle, and heats the air blown by the blower. The temperature is adjusted by heat exchange in the exchanger and supplied from the ceiling to the passenger compartment.

And in the vehicle air conditioner which concerns on patent document 1, it is trying to comprise the thin apparatus of the whole apparatus by devising the shape of the drain flow path into which the drain water which arises by the heat exchange in a heat exchanger flows in an air conditioning case. .

The air conditioner for a vehicle described in Patent Document 2 has a blower and a heat exchanger inside the casing of the air blown by the blower, and heat is generated when the blown air passes through the heat exchanger. The temperature of the air is adjusted by replacement, and the temperature-adjusted air is supplied to the vehicle interior.

In the vehicle air conditioner described in Patent Literature 2, the arrangement of each component in the vehicle air conditioner is devised by changing the flow direction on the upstream and downstream sides of the air flow with respect to the heat exchanger inside the heat exchanger. Thus, the entire device is made compact. Specifically, in Patent Document 2, a ventilation gap is formed in the evaporator, which is a heat exchanger, to bend the air flow flowing in from the air introduction unit on the upper side of the evaporator at a substantially right angle. The air from the vehicle is sent out from the air sending part on the rear side of the vehicle.

JP 2008-110762 A JP 2014-205476 A

Here, in the vehicle air conditioner arranged on the ceiling as in Patent Document 1, if the entire apparatus is thinned in order to secure the occupant's living space as much as possible, the air flow path when passing through the heat exchanger becomes narrow. Therefore, it is assumed that the ventilation pressure loss after passing through the heat exchanger increases. In this case, it is conceivable that a portion where air is stagnated is generated inside the heat exchanger, and the original heat exchange performance of the heat exchanger cannot be exhibited effectively.

Further, the vehicle air conditioner described in Patent Document 2 is configured such that air flows in accordance with the ventilation gap formed so as to bend substantially at right angles inside the heat exchanger, and thus passes through the heat exchanger. Ventilation pressure loss when doing so will increase. Therefore, even if it is a structure like patent document 2, the part in which air stagnates will arise inside a heat exchanger, and it is possible that the original heat exchange performance of a heat exchanger cannot be exhibited effectively.

The present disclosure has been made in view of these points, and relates to a vehicle air conditioner disposed on a ceiling portion of a vehicle, and it is possible to suppress stagnation of blown air inside a heat exchanger while realizing downsizing of the entire device. An object of the present invention is to provide a vehicle air conditioner.

According to one aspect of the present disclosure, the vehicle air conditioner includes:
The air conditioning case placed on the ceiling of the vehicle compartment has multiple tubes that are lined up at intervals in the vehicle longitudinal direction and the vehicle vertical direction and through which the heat exchange medium flows. A heat exchanger, an air-conditioning case that is disposed on one side in the vehicle front-rear direction with respect to the heat exchanger, and a blower opening that blows air that passes through the heat exchanger The first inflow part into which the blown air that has passed between the tubes in the heat exchanger flows, and the vertical direction of the vehicle with respect to the heat exchanger are arranged in a position facing the blower opening via The second inflow part into which the blown air that has passed between the tubes in the heat exchanger flows, and the blowout port from which the blown air that has flowed into the first inflow part and the second inflow part is blown out from the inside of the air conditioning case into the vehicle interior. And having.

According to the vehicle air conditioner, which is disposed on the ceiling of the vehicle, in the heat exchanger, the blown air supplied from the blower opening and the heat exchange medium are heat-exchanged to blow the temperature-adjusted air. It can be supplied to the passenger compartment from the exit.

The heat exchanger is configured by arranging a plurality of tubes at intervals in the vehicle longitudinal direction and the vehicle vertical direction. And the said vehicle air conditioner has the 1st inflow part arrange | positioned in the position facing a ventilation opening through the said heat exchanger, the ventilation opening arrange | positioned in the vehicle front-back direction one side, the said heat exchanger, It has the 2nd inflow part arranged at the vehicles up-and-down direction to a heat exchanger.

Thereby, according to the said vehicle air conditioner, when the ventilation air from a ventilation opening passes a heat exchanger, the flow of the ventilation air which goes to a 1st inflow part from a ventilation opening, and a 2nd inflow part from a ventilation opening The flow of blast air toward That is, according to the vehicle air conditioner, it is possible to ensure a degree of freedom in the vehicle front-rear direction and the vehicle vertical direction with respect to the flow of the blown air in the heat exchanger. As a result, the vehicle air conditioner can eliminate the stagnation of the blown air in the heat exchanger while improving the heat exchange performance of the heat exchanger while realizing a compact configuration for placement on the vehicle ceiling. Can be made.

It is a top view of the air conditioner for vehicles concerning this embodiment. It is a schematic diagram which shows the vehicle mounting position of the vehicle air conditioner which concerns on this embodiment. It is a front view of the air-conditioner for vehicles concerning this embodiment. It is a side view of the vehicle air conditioner which concerns on this embodiment. FIG. 5 is a cross-sectional view showing a VV cross section in FIG. 1. It is a top sectional view showing the blast air flow inside the vehicle air conditioner when there is no second inflow part. It is a plane sectional view showing the flow of blowing air inside the air-conditioner for vehicles concerning this embodiment. It is a vertical sectional view showing the blown air flow in the first air passage.

Hereinafter, embodiments will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

First, a schematic configuration of a vehicle air conditioner according to the present embodiment will be described with reference to the drawings. In the following description, when using the front / rear / left / right / up / down directions, the front / rear / left / right / up / down directions viewed from the occupant seated on the vehicle seat are shown. And the same definition is used also about the arrow suitably shown in each figure, and the vehicle width direction is equivalent to the left-right direction.

As shown in FIGS. 1 and 2, the vehicle air conditioner 1 according to the present embodiment is arranged on the ceiling portion R of the vehicle compartment I in order to make the vehicle cabin I of the vehicle C into a comfortable air conditioning environment. The air conditioner case 10 is configured to accommodate the blower 20, the evaporator 50, and the like.

In the air conditioning case 10 of the vehicle air conditioner 1, a suction port 16 and an air outlet 45 are disposed, and communicate with the interior of the passenger compartment I, respectively. Therefore, the air conditioner 1 for the vehicle sucks the air in the passenger compartment I from the suction port 16 into the air conditioning case 10 by the operation of the blower 20, and the blower outlet 45 as the blown air F whose temperature is adjusted by the evaporator 50. To the passenger compartment I.

In this embodiment, the vehicle air conditioner 1 is mounted on a so-called minivan type vehicle C having a three-row seat. In the compartment I of the vehicle C, the first row seat Sa, the second row seat Sb, and the third row seat Sc are arranged in this order from the front to the rear of the vehicle. In the vehicle C, the first row seat Sa is configured as a driver seat and a passenger seat. The second row seat Sb and the third row seat Sc are constituted by, for example, bench type seats on which three passengers can be seated.

As shown in FIG. 2, the vehicle air conditioner 1 is arranged behind the first row seat Sa and in front of the second row seat Sb in the ceiling portion R of the passenger compartment I, and at the central portion in the vehicle width direction. positioned. The vehicle air conditioner 1 operates according to the operation of the operation panel disposed in the vicinity of the second row seat Sb and the third row seat Sc, and the air conditioning on the second row seat Sb and third row seat Sc side in the passenger compartment I is performed. Is configured to do.

That is, the vehicle air conditioner 1 is mainly operated by the occupant P seated on the second row seat Sb or the third row seat Sc to improve the comfort of the occupant P on the rear side of the passenger compartment I. Used. That is, the passengers in the second row seat Sb and the third row seat Sc can perform the air conditioning operation of the vehicle air conditioner 1 without the driver seat or the passenger seat passenger P.

The roof head lining that forms the ceiling portion R between the first row seat Sa and the second row seat Sb has openings so as to correspond to the positions of the suction port 16 and the air outlet 45 in the vehicle air conditioner 1. Is formed. Accordingly, the air inlet 16 and the air outlet 45 of the vehicle air conditioner 1 are arranged so as to be exposed to the vehicle compartment I side through the opening.

Next, a specific configuration of the vehicle air conditioner 1 according to the present embodiment will be described in detail with reference to FIGS. As described above, the vehicle air conditioner 1 includes the blower 20 and the evaporator 50 constituting a part of the vapor compression refrigeration cycle in the air conditioning case 10 disposed in the ceiling portion R of the vehicle C. Contained and configured.

As shown in FIGS. 3 to 5, the air conditioning case 10 includes an upper case 11 constituting the upper outer shell of the vehicle air conditioner 1 and a lower case constituting the lower outer shell of the vehicle air conditioner 1. 13, the vehicle is configured to be thin with a small size in the vertical direction. The upper case 11 and the lower case 13 are assembled with screws or the like.

The upper case 11 is formed with a plurality of upper fixing parts 12 symmetrically. The upper fixing portion 12 is used when the air conditioning case 10 is fixed to an upper body member in the ceiling portion R of the vehicle C. On the other hand, the lower case 13 is formed with a plurality of lower fixing portions 14 symmetrically. The lower fixing portion 14 is used when the air conditioning case 10 is fixed to a vehicle body member (for example, roof reinforcement) located on the vehicle compartment I side in the ceiling portion R.

As shown in FIG. 1, each lower fixing portion 14 is located on the vehicle front side with respect to the upper fixing portion 12 in the air conditioning case 10. That is, since the air conditioning case 10 is fixed to the ceiling portion R of the vehicle C using the upper fixing portion 12 and the lower fixing portion 14 that are formed at different positions, the vehicle air conditioner 1 is attached to the predetermined ceiling portion R. Can be fixed in position.

As shown in FIG. 1 and the like, a fan accommodating portion 15 is disposed in the center portion of the air conditioning case 10 in the vehicle width direction. The fan accommodating part 15 comprises the vehicle rear side part in the said air-conditioning case 10, and accommodates the air blower 20 in the inside. In addition, a suction port 16 is formed in the lower surface of the fan housing portion 15, and the interior of the air conditioning case 10 and the fan housing portion 15 communicates with the interior of the passenger compartment I.

The blower 20 is disposed inside the fan housing 15 so as to face the suction port 16, sucks air in the vehicle compartment I from the suction port 16, and blows it into the air conditioning case 10 as blown air F. The blower 20 is disposed inside the fan accommodating portion 15 by being fixed to a vehicle body member (for example, roof reinforcement) in the ceiling portion R. The blower 20 is an electric blower that drives a centrifugal multiblade fan (that is, a sirocco fan) by an electric motor 21. The centrifugal multiblade fan has a substantially cylindrical shape, and has a large number of blades on the radially outer side.

The electric motor 21 constitutes the lower part of the blower 20 and has a drive shaft extending along the vehicle vertical direction. Since the centrifugal multiblade fan is fixed to the drive shaft of the electric motor 21, the blower 20 operates the electric motor 21, so that the air sucked into the shaft core portion of the centrifugal multiblade fan via the suction port 16. It can be blown out radially outward. And the rotation speed (blowing amount) of the centrifugal multiblade fan in the blower 20 is controlled by a control voltage output from an air conditioning control device (not shown).

As shown in FIG. 1 and the like, a blower opening 25 is formed on the front side of the vehicle in the fan accommodating portion 15. The air blowing port 25 is a portion that is blown out from the fan housing portion 15 when the air sucked from the suction port 16 is blown as blown air F by the operation of the blower 20. The blower opening 25 is a part for supplying blown air F flowing through the air conditioning case 10, and functions as a blower opening in the present disclosure.

The vehicle air conditioner 1 includes a first air passage 30, a second air passage 35, and a third air passage 40 in addition to the fan housing portion 15. The first air passage 30, the second air passage 35, and the third air passage 40 each function as a flow path for the blown air F blown through the blower opening 25.

The first air passage 30 is formed in the air conditioning case 10 of the vehicle air conditioner 1 so as to extend from the blower opening 25 formed in the fan accommodating portion 15 to the front side of the vehicle. Therefore, the blown air F blown from the blower opening 25 flows through the first air passage 30 toward the vehicle front side.

As shown in FIG. 5, a rib 34 is arranged on the vehicle front side inside the air conditioning case 10. The upper end of the rib 34 is located at a position away from the inner surface of the air conditioning case 10 on the upper side of the vehicle by a predetermined distance. Accordingly, the blown air F that has flowed through the first air passage 30 passes above the ribs 34 inside the air conditioning case 10. That is, the first air passage 30 according to the present embodiment can be defined as an air passage extending from the blower opening 25 of the fan housing portion 15 to the rib 34 toward the vehicle front side.

As shown in FIG. 1 and the like, the vehicle air conditioner 1 has an evaporator 50 inside the first air passage 30 in the air conditioning case 10. The evaporator 50 is disposed on the upper side of the first air passage 30 and is attached to the upper surface of the upper case 11. The evaporator 50 is connected to a vapor compression refrigeration cycle via a refrigerant pipe connection portion 51, and includes a tube 52 through which refrigerant flows and a plurality of plate fins 53 joined to the tube 52. is doing.

Although not shown, the vapor compression refrigeration cycle includes a compressor, a condenser, and a decompression unit (for example, an expansion valve, a capillary tube, etc.) in addition to the evaporator 50. It is configured by connecting with refrigerant piping. Therefore, in the refrigeration cycle, the refrigerant is compressed into a high temperature and high pressure state by the compressor and radiated in the condenser, and then the refrigerant is decompressed by the decompression unit and flows into the evaporator 50.

Thereby, the evaporator 50 can absorb the heat from the blown air F and cool it by heat exchange between the blown air F flowing through the first air passage 30 and the refrigerant flowing through the tube 52. That is, the evaporator 50 functions as a cooling heat exchanger in the vehicle air conditioner 1 and corresponds to the heat exchanger in the present disclosure.

As shown in FIG. 1 and the like, the tube 52 in the evaporator 50 includes a plurality of straight pipe portions 52a extending linearly so as to cross the first air passage 30 in the vehicle width direction, and ends of the straight pipe portions 52a. The parts are connected by a U-shaped pipe part 52b having a substantially U shape. Therefore, the tube 52 is arranged to meander in the first air passage 30 in the vehicle width direction. Since the end of the tube 52 is connected to the refrigerant pipe connection 51, the refrigerant of the vapor compression refrigeration cycle flows into and out of the tube 52 through the refrigerant pipe connection 51.

As shown in FIG. 5 and the like, in the evaporator 50, a plurality (four in this embodiment) of straight pipe portions 52a of the tube 52 are arranged at intervals in the vehicle front-rear direction. In addition, a plurality of straight pipe portions 52a are also arranged at predetermined intervals in the vertical direction of the vehicle in the evaporator 50. Note that the number of straight pipe portions 52a in the vehicle vertical direction of the evaporator 50 is arranged to be smaller than that in the vehicle front-rear direction (two in the present embodiment).

That is, predetermined intervals are formed between the straight pipe portions 52a of the tubes 52 in the vehicle front-rear direction and the vehicle vertical direction, respectively, so that the flow path area when passing through the evaporator 50 is sufficiently large. can do.

Therefore, the blown air F flowing through the first air passage 30 can flow not only in the vehicle longitudinal direction but also in the vehicle vertical direction when passing through the evaporator 50. And when passing between the straight pipe | tube parts 52a in the tube 52, heat exchange with the ventilation air F and the refrigerant | coolant which flows through the inside of the tube 52 is performed.

The plurality of plate fins 53 are formed in a plate shape with a material having good thermal conductivity. As shown in FIGS. 1 and 5, the plate fins 53 are spaced from each other in the vehicle width direction with respect to the straight pipe portion 52 a of the tube 52. Are joined. Therefore, the refrigerant flowing inside the tube 52 can absorb heat from the blown air F flowing through the first air passage 30 via the plate fins 53 in addition to the tube wall of the tube 52. Since each plate fin 53 is arranged so that the thickness direction thereof coincides with the vehicle width direction, heat exchange between the blown air F and the refrigerant can be performed in a wider area.

The refrigerant used in this refrigeration cycle is an HFC refrigerant (specifically, R134a), and a vapor compression subcritical refrigeration cycle in which the high-pressure side refrigerant pressure does not exceed the critical pressure of the refrigerant. It is composed. Of course, an HFO refrigerant (for example, R1234yf) or the like may be adopted as the refrigerant. These refrigerants are examples of the heat exchange medium in the present disclosure.

Here, as shown in FIG. 5, in the first air passage 30, the first inflow portion 31 is located at a position facing the blower opening 25 via the evaporator 50. That is, the first inflow portion 31 is defined on the vehicle front side of the evaporator 50 above the first air passage 30 and on the vehicle rear side with respect to the rib 34. Accordingly, the blown air F that has flowed into the first air passage 30 from the blower opening 25 passes through the first inflow portion 31 when flowing straight through the evaporator 50 toward the front side of the vehicle. The first inflow portion 31 functions as a first inflow portion in the present disclosure.

And the 2nd inflow part 32 is located in the lower part of evaporator 50 in the 1st air passage 30. As shown in FIG. The second inflow portion 32 is defined as a lower portion of the first air passage 30 and a portion extending from the blower opening 25 toward the rib 34 toward the front side of the vehicle.

Therefore, when the blown air F flowing through the first air passage 30 has a component in the vertical direction of the vehicle as the direction of the flow, it reaches the second inflow portion 32. That is, the second inflow portion 32 functions as a second inflow portion in the present disclosure. In addition, communication portions 32 a are disposed on the left and right sides of the second inflow portion 32. The communication portion 32a communicates the second inflow portion 32 with a third air passage 40 described later.

Further, a merging portion 33 is located in an upper part of the upper end portion of the rib 34 in the first air passage 30. The merging portion 33 is a portion that causes the blown air F that has passed through the first inflow portion 31 and the blown air F that has reached the second inflow portion 32 to merge and flow into the second air passage 35. Specifically, the merging portion 33 is defined as an upper portion of the upper end portion of the rib 34 and a portion on the vehicle front side of the first inflow portion 31 (that is, the downstream side of the blown air F). Therefore, the junction part 33 functions as a junction part in the present disclosure.

A second air passage 35 is formed on the front side of the vehicle inside the air conditioning case 10. The second air passage 35 is formed by a space between the inner surface of the air conditioning case 10 on the vehicle front side and the rib 34. That is, the second air passage 35 extends in the vehicle right direction and the left direction from the end portion (that is, the junction portion 33) of the first air passage 30 that extends in the vehicle width direction central portion forward of the vehicle.

Therefore, in the vehicle air conditioner 1, the blown air F that has passed through the first air passage 30 flows into the second air passage 35 on the front side of the vehicle and follows the second air passage 35 in the right direction of the vehicle and the left direction of the vehicle. Branch to and flow.

A third air passage 40 is formed on each side of the air conditioning case 10 in the vehicle width direction, and extends toward the vehicle rear side. That is, each third air passage 40 is formed at a position on the left and right sides of the vehicle with respect to the first air passage 30 and the evaporator 50 in the air conditioning case 10.

The third air passages 40 are connected to the second air passages 35 on both sides of the air-conditioning case 10 in the vehicle width direction, so that the blown air F that has passed through the second air passages 35 is guided to the vehicle rear side. be able to. That is, the second air passage 35 can change the direction of the flow of the blown air F that has passed through the first air passage 30 toward the front of the vehicle by 180 ° in the horizontal direction. It can be led to the rear side.

The third air passage 40 extends to the reinforcing portion 46 formed in the vehicle rear portion on both sides of the air conditioning case 10 in the vehicle width direction. As described above, the third air passage 40 communicates with the second inflow portion 32 via the communication portion 32a. Therefore, in the third air passage 40, the blown air F that flows in from the second air passage 35 and the blown air F that flows in from the second inflow portion 32 merge.

The air outlet 45 is formed in the front part of the reinforcement part 46 located in the rear-end part of the 3rd air passage 40, respectively. Each air outlet 45 is formed by opening the lower case 13 on the vehicle rear side of the air conditioning case 10 and communicates the interior of the third air passage 40 and the interior of the passenger compartment I in the air conditioning case 10. Therefore, the blown air F that has flowed through the third air passage 40 is blown out from the inside of the air-conditioning case 10 into the vehicle compartment I through the air outlets 45.

As shown in FIGS. 1 to 5, the vehicular air conditioner 1 includes a first air passage 30 and a second air flow path in the air conditioning case 10 from the inlet 16 to the outlet 45. By configuring the air passage 35 and the third air passage 40 so that the blown air F makes a U-turn along the vehicle front-rear direction, the size of the vehicle air-conditioning apparatus 1 in the vehicle front-rear direction can be reduced and compact. Can be configured.

Further, in the vehicle air conditioner 1, the second air passage 35 changes the flow of the blown air F that has passed through the first air passage 30 in the horizontal direction by 180 ° in the vehicle front portion of the air conditioning case 10. The three air passages 40 are configured to be guided. Further, the third air passage 40 is disposed on the left and right sides of the air conditioning case 10 with respect to the first air passage 30 and the evaporator 50.

That is, according to the vehicle air conditioner 1, the first air passage 30, the second air passage 35, and the third air passage 40 can be arranged on substantially the same horizontal plane. The size of the air conditioner 1 in the vertical direction of the vehicle can be reduced and a compact configuration can be achieved.

Since the vehicle air conditioner 1 is disposed on the ceiling portion R of the vehicle C as shown in FIG. 2, the vehicle interior I is widened by configuring the device compactly in the vehicle longitudinal direction and the vehicle vertical direction. And a sufficient space for the occupant P can be secured.

Here, in the configuration having the first air passage 30, the second air passage 35, and the third air passage 40 as in the vehicle air conditioner 1, the first air passage 30 has the second inflow portion 32. The case where it is not will be considered with reference to FIG.

In this case, when the air-conditioning operation is started, the operation of the blower 20 is started together with the operation of the compressor in the refrigeration cycle. As a result, the air in the passenger compartment I is sucked into the air conditioning case 10 through the suction port 16 of the fan accommodating portion 15. Then, the air sucked from the suction port 16 is blown out from the blower port 25 into the first air passage 30 as the blown air F along with the operation of the blower 20, and passes through the first air passage 30. It is cooled by heat exchange in the evaporator 50.

In this consideration, since the first air passage 30 does not have the second inflow portion 32, the first air passage 30 is configured by the first inflow portion 31. For this reason, even if the blown air F flowing through the first air passage 30 has a component in the vehicle vertical direction as the direction of the flow, it is restricted to flow in the first inflow portion 31.

Thus, the blown air F that has passed through the first inflow portion 31 passes through the upper portion of the rib 34 and flows into the second air passage 35. That is, in this case, all of the blown air F that has flowed into the first air passage 30 from the blower opening 25 flows into the second air passage 35.

The flow of the blown air F that has passed through the end portion side of the evaporator 50 in the vehicle width direction is guided by the wall surface on the vehicle front side in the second air passage 35 and flows toward the third air passage 40 side. When the air flows into the third air passages 40, the blown air F flows toward the vehicle rear side, and is blown into the passenger compartment I from the air outlet 45, respectively.

Here, the flow of the blown air F when flowing from the first air passage 30 into the second air passage 35 will be considered. In this configuration, the blown air F that has passed through the right end portion of the evaporator 50 and has flowed into the second air passage 35 flows in the right direction of the vehicle along the second air passage 35 and passes through the left end portion of the evaporator 50. The blown air F that has flowed into the second air passage 35 then flows in the left direction of the vehicle through the second air passage 35.

At this time, when the blown air F that has passed through the central portion of the evaporator 50 in the vehicle width direction flows into the second air passage 35, it flows in the vehicle width direction along the wall surface on the front side of the second air passage 35. However, at this time, the flow of the blown air F that has passed through the central portion of the evaporator 50 is hindered by the flow of the blown air F that flows on both sides in the vehicle width direction.

As a result, as shown in FIG. 6, in the second air passage 35, a stay portion As where the flow of the blown air F stagnates is generated in a portion corresponding to the front of the central portion of the evaporator 50. When this stay part As is generated inside the second air passage 35, the pressure loss of the blown air F in the vehicle air conditioner 1 is increased, and the air volume in the vehicle air conditioner 1 is reduced. It is done.

Subsequently, the flow of the blown air F in the vehicle air conditioner 1 described above will be described in detail with reference to the drawings. That is, the flow of the blown air F when the first air passage 30 includes the first inflow portion 31 and the second inflow portion 32 will be described. First, the flow of the blown air F from the inlet 16 to the outlet 45 in the vehicle air conditioner 1 will be described with reference to FIG.

When the air conditioning operation by the vehicle air conditioner 1 is started, the operation of the electric motor 21 is started together with the operation of the compressor in the refrigeration cycle. Thereby, the operation of the blower 20 is started, and the air in the passenger compartment I is sucked into the air conditioning case 10 through the suction port 16 of the fan accommodating portion 15 arranged on the vehicle rear side in the vehicle air conditioner 1. .

As shown in FIG. 7, the air sucked from the suction port 16 is the first air as the blown air F from the blower port 25 formed on the vehicle front side of the fan housing portion 15 with the operation of the blower 20. It is blown out into the passage 30.

The blown air F that has flowed into the first air passage 30 passes between the tubes 52 and the plate fins 53 in the evaporator 50 and flows in the first air passage 30 toward the front side of the vehicle. At this time, the blown air F is cooled by exchanging heat with the refrigerant in the evaporator 50. The flow of the blown air F in the first air passage 30 will be described in detail later.

The blown air F that has passed through the evaporator 50 in the first air passage 30 passes through the merging portion 33 located above the rib 34 and flows into the second air passage 35. Part of the blown air F flowing into the second air passage 35 flows in the right direction of the vehicle according to the second air passage 35, and the other portion flows in the left direction of the vehicle according to the second air passage 35.

The blown air F that has flowed in the right direction of the vehicle through the second air passage 35 flows into the third air passage 40 disposed on the right side of the air conditioning case 10 in the vehicle. In this case, the second air passage 35 changes the direction of the blown air F flowing through the first air passage 30 toward the front side of the vehicle by 180 ° toward the right side in the horizontal direction, so that the third air passage 40 on the right side of the vehicle. To the rear side of the vehicle.

Meanwhile, the blown air F that has flowed in the left direction of the vehicle in the second air passage 35 flows into the third air passage 40 disposed on the left side of the air conditioning case 10 in the vehicle. In this case, the second air passage 35 changes the direction of the blown air F flowing through the first air passage 30 toward the front side of the vehicle by 180 ° toward the left side in the horizontal direction, so that the third air passage 40 on the left side of the vehicle. To the rear side of the vehicle.

The blown air F that has flown into the third air passages 40 flows toward the vehicle rear side, and travels from the inside of the air conditioning case 10 through the air outlets 45 disposed in the vehicle rear portion of the air conditioning case 10. Blow out into chamber I.

Thereby, according to the said vehicle air conditioner 1, since the blowing air F temperature-adjusted by the heat exchange in the evaporator 50 can be supplied from each blower outlet 45, the comfort in the compartment I is improved. Can be made.

Moreover, according to the said vehicle air conditioner 1, since the evaporator 50 is arrange | positioned in the 1st air path 30 before the flow of the ventilation air F branches in the vehicle left-right direction, for example, each 3rd air path Compared with the case where a heat exchanger is arranged in 40, the assembly man-hour of the evaporator 50 can be reduced.

Subsequently, the flow of the blown air F in the first air passage 30 in the vehicle air conditioner 1 will be described with reference to FIG.

As described above, since the vehicle air conditioner 1 is disposed on the ceiling portion R of the vehicle C, the device size in the vertical direction of the vehicle is formed to be compact in terms of securing a living space called the cabin I. Is done. Therefore, as shown in FIGS. 1 to 5, the configuration of the evaporator 50 in the vehicle air conditioner 1 is also configured to be thin with a small size in the vehicle vertical direction.

In this regard, in the evaporator 50 in the vehicle air conditioner 1, a plurality of straight pipe portions 52a of the tube 52 are arranged at intervals in the vehicle front-rear direction, and the vehicle vertical direction in the evaporator 50 is also predetermined. A plurality are arranged with an interval of. The number of straight pipe portions 52a in the vehicle vertical direction of the evaporator 50 is arranged to be smaller than that in the vehicle front-rear direction.

Thereby, according to the said vehicle air conditioner 1, since the space | interval of sufficient magnitude | size can be ensured as a flow-path area at the time of the ventilation air F passing the evaporator 50, regarding the flow direction of the ventilation air F Further, it is possible to give a degree of freedom in the vehicle vertical direction as well as the vehicle longitudinal direction.

As shown in FIG. 8, a first inflow portion 31 and a second inflow portion 32 are disposed in the first air passage 30. Since the 1st inflow part 31 is facing the blower opening 25 via the evaporator 50, the said vehicle air conditioner 1 is the flow of the ventilation air F to the vehicle front side at the time of flowing through the evaporator 50. Can be tolerated.

Further, since the second inflow portion 32 is disposed below the evaporator 50 in the first air passage 30, the vehicle air conditioner 1 sends the air blown up and down in the vehicle when passing through the evaporator 50. The flow of F can be allowed.

And since the 2nd inflow part 32 has the communication part 32a of the vehicle width direction both sides as shown in FIG. 7, the detour air Fa which goes to each 3rd air passage 40 from the 2nd inflow part 32 is shown. The flow is acceptable. The flow of the bypass air Fa is a flow that bypasses the second air passage 35 and guides the blown air F in the first air passage 30 to the third air passage 40 and the outlet 45.

That is, according to the vehicle air conditioner 1, by arranging the first inflow portion 31 and the second inflow portion 32 with respect to the evaporator 50 in the first air passage 30, the vehicle longitudinal direction and the vehicle vertical direction are arranged. The flow of the blast air F to can be permitted.

As a result, the vehicle air conditioner 1 can disperse the flow of the blown air F from the first air passage 30 into the flow on the second air passage 35 side and the flow on the second inflow portion 32 side. That is, the vehicle air conditioner 1 can alleviate the concentration of the flow of the blown air F with respect to the second air passage 35, and can eliminate the staying portion As at the position corresponding to the central portion of the evaporator 50. . And since the said vehicle air conditioner 1 can suppress the pressure loss of the ventilation air F low and can let the ventilation air F pass through without a hindrance, the fall of the air volume in the vehicle air conditioner 1 can be prevented.

Thereby, according to the said vehicle air conditioner 1, even if it is a thin and compact structure for arrange | positioning in the ceiling part R of the vehicle C, the stagnation of the ventilation air F in the evaporator 50 can be eliminated. In addition, by smoothing the flow of the blown air F in the evaporator 50, the heat exchange performance in the evaporator 50 can be effectively exhibited using the tubes 52 and the plate fins 53.

Here, in the evaporator 50, a plurality (four in this embodiment) of the straight pipe portions 52a of the tube 52 are arranged at intervals in the vehicle longitudinal direction and the vehicle vertical direction. Further, the number of straight pipe portions 52a in the vehicle vertical direction of the evaporator 50 is arranged to be smaller than that in the vehicle front-rear direction (two in this embodiment).

Therefore, the blown air F that flows straight from the blower opening 25 toward the first inflow portion 31 passes around the most straight pipe portions 52a as shown in FIG. It is thought that the lowest temperature is exhibited by heat exchange.

On the other hand, in the blown air F flowing from the blower opening 25 to the second inflow part 32, the more the blown air F reaches the second inflow part 32 at a position close to the blower opening 25, the more the heat exchangeable straight pipe part 52 a is. The number is reduced. For this reason, as the blown air F reaches the second inflow portion 32 at a position close to the blower opening 25, the air is not sufficiently cooled, and the temperature difference with respect to the blown air F that reaches the first inflow portion 31 increases. It will end up.

Here, if the temperature difference between the blown air F in the first inflow portion 31 and the blown air F in the second inflow portion 32 is large, white dew is generated when the merging portion 33 merges, and the interior of the passenger compartment I It may be a problem when supplying.

In this regard, according to the vehicle air conditioner 1, the junction 33 is disposed above the rib 34 in the first air passage 30. With this arrangement, it is possible to increase the number of straight pipe portions 52 a that can exchange heat with respect to the blown air F that passes through the second inflow portion 32 and reaches the merging portion 33.

That is, according to the vehicle air conditioner 1 according to the present embodiment, the temperature of the blown air F that has passed through the second inflow portion 32 is made as close as possible to the temperature of the blown air F that has passed through the first inflow portion 31. In the state, it can be merged at the merge section 33, and the possibility of white dew generation at the merge section 33 can be reduced.

As described above, the vehicle air conditioner 1 according to the present embodiment is disposed on the ceiling portion R of the vehicle C, and is configured to accommodate the blower 20 and the evaporator 50 inside the air conditioning case 10. The vehicle air conditioner 1 adjusts the temperature of the blown air F flowing through the inside of the air conditioning case 10 with the operation of the blower 20 by the evaporator 50 and supplies the air to the passenger compartment I of the vehicle C.

The vehicle air conditioner 1 is arranged on the ceiling portion R and is configured so that the size in the vehicle vertical direction is compact in terms of securing a living space called the cabin I. For this reason, the evaporator 50 in the vehicle air conditioner 1 is configured by arranging the straight pipe portions 52a of the plurality of tubes 52 at intervals in the vehicle front-rear direction and the vehicle vertical direction so as to be thin in the vehicle vertical direction. ing. And the said vehicle air conditioner 1 has the 1st inflow part 31 arrange | positioned in the position facing the ventilation opening 25 via the evaporator 50, the ventilation opening 25 arrange | positioned behind the evaporator 50, the said A second inflow portion 32 is provided below the vehicle with respect to the evaporator 50.

Thereby, according to the said vehicle air conditioner 1, when the ventilation air F from the ventilation opening 25 passes the evaporator 50, the flow of the ventilation air F which goes to the 1st inflow part 31 from the ventilation opening 25, and ventilation The flow of the blown air F toward the second inflow portion 32 from the mouth 25 can be allowed. That is, according to the vehicle air conditioner 1, the degree of freedom in the vehicle longitudinal direction and the vehicle vertical direction can be ensured with respect to the flow of the blown air F in the evaporator 50.

Thereby, the vehicle air conditioner 1 can eliminate the stagnation of the blown air F in the evaporator 50 while realizing a compact configuration for placement on the ceiling portion R of the vehicle C. Heat exchange performance can be exhibited effectively.

Further, according to the vehicle air conditioner 1, the merging portion 33 is disposed above the rib 34 corresponding to the end portion of the first air passage 30, and the blown air F that has passed through the first inflow portion 31, 2 The blown air F that has passed through the inflow portion 32 can be merged and flown into the second air passage 35. Then, the blown air F that has flowed into the second air passage 35 is blown out from the air outlet 45 into the vehicle compartment I through the third air passage 40.

Therefore, according to the vehicle air conditioner 1, in the first air passage 30, the flow of the blown air F from the blower port 25 toward the first inflow portion 31 and the blown air from the blower port 25 toward the second inflow portion 32. Even if the flow of F is allowed, the blown air F can be supplied into the passenger compartment I without being wasted.

On the other hand, in the blown air F flowing from the blower opening 25 to the second inflow part 32, the more the blown air F reaches the second inflow part 32 at a position near the blower opening 25, the more the heat exchangeable straight pipe part 52 a is The number is reduced. For this reason, as the blown air F reaches the second inflow portion 32 at a position close to the blower opening 25, the air is not sufficiently cooled, and the temperature difference with respect to the blown air F that reaches the first inflow portion 31 increases. It will end up.

As mentioned above, although this indication was explained based on an embodiment, this indication is not limited to the embodiment mentioned above at all. That is, various improvements and modifications can be made without departing from the spirit of the present disclosure. For example, the configurations of the above-described embodiments may be combined as appropriate, and the above-described embodiments may be variously modified.

In the above-described embodiment, as shown in FIG. 8 and the like, the second inflow portion 32 is disposed below the evaporator 50 in the first air passage 30, but the present invention is not limited to this mode. For example, the second inflow portion 32 may be disposed above the evaporator 50 in the first air passage 30, or the second inflow portion may be disposed above and below the evaporator 50.

Moreover, in embodiment mentioned above, although the fan accommodating part 15 was formed in the vehicle rear side as a part of air-conditioning case 10, and the air blower 20 has been arrange | positioned in the inside, it is not limited to this aspect. . For example, the suction port 16 and the blower 20 are arranged at a position away from the air conditioning case 10 in the vehicle C, and the blown air F is supplied from the blower port 25 to the first air passage 30 via a duct. May be.

And in embodiment mentioned above, although the evaporator 50 which comprises a vapor compression refrigeration cycle was used as a heat exchanger, it is not limited to this aspect. As a heat exchanger according to the present disclosure, it is sufficient that the temperature of the blown air F can be adjusted by exchanging heat with the blown air F. For example, even if a condenser constituting a vapor compression refrigeration cycle is used. good.

Further, the heat exchange medium in the heat exchanger according to the present disclosure is not limited to the refrigerant circulating in the refrigeration cycle, and cooling water circulating in various cooling water circuits such as an engine cooling water circuit may be used. Is possible.

Although the present disclosure has been described with reference to embodiments, it is understood that the present disclosure is not limited to the above-described embodiments and structures. Rather, the present disclosure includes various modifications and modifications within the equivalent scope. In addition, although various elements of the present disclosure have been shown in various combinations and forms, other combinations or forms that include more or fewer elements than those elements, or only one of them. Are within the scope and spirit of the present disclosure.

Claims

An air-conditioning case (10) disposed in a vehicle compartment ceiling (R) of the vehicle (C);
A heat exchanger (50) which has a plurality of tubes (52, 52a) which are arranged at intervals in the vehicle longitudinal direction and the vehicle vertical direction and through which the heat exchange medium flows, and which are arranged inside the air conditioning case. When,
An air outlet (25) that is disposed on one side of the vehicle front-rear direction with respect to the heat exchanger in the air-conditioning case and blows air that passes through the heat exchanger;
A first inflow part (31) that is disposed in a position facing the air blowing port via the heat exchanger inside the air conditioning case and into which the blown air that has passed between the tubes in the heat exchanger flows;
A second inflow portion (32) that is arranged in the vehicle vertical direction with respect to the heat exchanger inside the air conditioning case and into which the blown air that has passed between the tubes in the heat exchanger flows;
An air conditioner for a vehicle having an air outlet (45) through which blown air that has flowed into the first inflow portion and the second inflow portion is blown out from the inside of the air conditioning case into the vehicle interior.
In the air conditioning case, the air blower is disposed on the upstream side of the blower air flow, and merges the blown air that has flowed into the first inflow part and the blown air that has flowed into the second inflow part. The vehicle air conditioner according to claim 1, further comprising a merging portion (33) for guiding the blown air to the blowout port.
In the heat exchanger, the number of tubes arranged in the vehicle front-rear direction is greater than the number of tubes arranged in the vehicle up-down direction,
The vehicle air conditioner according to claim 2, wherein the merging portion is disposed at a position where a temperature difference between the blown air flowing into the first inflow portion and the blown air flowing into the second inflow portion is minimized.